#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/vmalloc.h>
#include <linux/rhashtable.h>
#include <linux/audit.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_offload.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
#define NFT_SET_MAX_ANONLEN 16
#define NFT_MAX_SET_NELEMS ((2048 - sizeof(struct nft_trans_elem)) / sizeof(struct nft_trans_one_elem))
unsigned int nf_tables_net_id __read_mostly;
static LIST_HEAD(nf_tables_expressions);
static LIST_HEAD(nf_tables_objects);
static LIST_HEAD(nf_tables_flowtables);
static LIST_HEAD(nf_tables_gc_list);
static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
enum {
NFT_VALIDATE_SKIP = 0,
NFT_VALIDATE_NEED,
NFT_VALIDATE_DO,
};
static struct rhltable nft_objname_ht;
static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
static const struct rhashtable_params nft_chain_ht_params = {
.head_offset = offsetof(struct nft_chain, rhlhead),
.key_offset = offsetof(struct nft_chain, name),
.hashfn = nft_chain_hash,
.obj_hashfn = nft_chain_hash_obj,
.obj_cmpfn = nft_chain_hash_cmp,
.automatic_shrinking = true,
};
static const struct rhashtable_params nft_objname_ht_params = {
.head_offset = offsetof(struct nft_object, rhlhead),
.key_offset = offsetof(struct nft_object, key),
.hashfn = nft_objname_hash,
.obj_hashfn = nft_objname_hash_obj,
.obj_cmpfn = nft_objname_hash_cmp,
.automatic_shrinking = true,
};
struct nft_audit_data {
struct nft_table *table;
int entries;
int op;
struct list_head list;
};
static const u8 nft2audit_op[NFT_MSG_MAX] = {
[NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
[NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
[NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
[NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
[NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
[NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
[NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
[NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
[NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
[NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
[NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
[NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
[NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
[NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
[NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
[NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
[NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
};
static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
{
switch (table->validate_state) {
case NFT_VALIDATE_SKIP:
WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
break;
case NFT_VALIDATE_NEED:
break;
case NFT_VALIDATE_DO:
if (new_validate_state == NFT_VALIDATE_NEED)
return;
}
table->validate_state = new_validate_state;
}
static bool nft_chain_vstate_valid(const struct nft_ctx *ctx,
const struct nft_chain *chain)
{
const struct nft_base_chain *base_chain;
enum nft_chain_types type;
u8 hooknum;
if (WARN_ON_ONCE(!nft_is_base_chain(ctx->chain)))
return false;
base_chain = nft_base_chain(ctx->chain);
hooknum = base_chain->ops.hooknum;
type = base_chain->type->type;
if (chain->vstate.depth >= ctx->level &&
chain->vstate.hook_mask[type] & BIT(hooknum))
return true;
return false;
}
static void nf_tables_trans_destroy_work(struct work_struct *w);
static void nft_trans_gc_work(struct work_struct *work);
static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
static void nft_ctx_init(struct nft_ctx *ctx,
struct net *net,
const struct sk_buff *skb,
const struct nlmsghdr *nlh,
u8 family,
struct nft_table *table,
struct nft_chain *chain,
const struct nlattr * const *nla)
{
ctx->net = net;
ctx->family = family;
ctx->level = 0;
ctx->table = table;
ctx->chain = chain;
ctx->nla = nla;
ctx->portid = NETLINK_CB(skb).portid;
ctx->report = nlmsg_report(nlh);
ctx->flags = nlh->nlmsg_flags;
ctx->seq = nlh->nlmsg_seq;
bitmap_zero(ctx->reg_inited, NFT_REG32_NUM);
}
static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
int msg_type, u32 size)
{
struct nft_trans *trans;
trans = kzalloc(size, GFP_KERNEL);
if (trans == NULL)
return NULL;
INIT_LIST_HEAD(&trans->list);
trans->msg_type = msg_type;
trans->net = ctx->net;
trans->table = ctx->table;
trans->seq = ctx->seq;
trans->flags = ctx->flags;
trans->report = ctx->report;
return trans;
}
static struct nft_trans_binding *nft_trans_get_binding(struct nft_trans *trans)
{
switch (trans->msg_type) {
case NFT_MSG_NEWCHAIN:
case NFT_MSG_NEWSET:
return container_of(trans, struct nft_trans_binding, nft_trans);
}
return NULL;
}
static void nft_trans_list_del(struct nft_trans *trans)
{
struct nft_trans_binding *trans_binding;
list_del(&trans->list);
trans_binding = nft_trans_get_binding(trans);
if (trans_binding)
list_del(&trans_binding->binding_list);
}
static void nft_trans_destroy(struct nft_trans *trans)
{
nft_trans_list_del(trans);
kfree(trans);
}
static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
bool bind)
{
struct nftables_pernet *nft_net;
struct net *net = ctx->net;
struct nft_trans *trans;
if (!nft_set_is_anonymous(set))
return;
nft_net = nft_pernet(net);
list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
switch (trans->msg_type) {
case NFT_MSG_NEWSET:
if (nft_trans_set(trans) == set)
nft_trans_set_bound(trans) = bind;
break;
case NFT_MSG_NEWSETELEM:
if (nft_trans_elem_set(trans) == set)
nft_trans_elem_set_bound(trans) = bind;
break;
}
}
}
static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
{
return __nft_set_trans_bind(ctx, set, true);
}
static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
{
return __nft_set_trans_bind(ctx, set, false);
}
static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
struct nft_chain *chain, bool bind)
{
struct nftables_pernet *nft_net;
struct net *net = ctx->net;
struct nft_trans *trans;
if (!nft_chain_binding(chain))
return;
nft_net = nft_pernet(net);
list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
switch (trans->msg_type) {
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain(trans) == chain)
nft_trans_chain_bound(trans) = bind;
break;
case NFT_MSG_NEWRULE:
if (nft_trans_rule_chain(trans) == chain)
nft_trans_rule_bound(trans) = bind;
break;
}
}
}
static void nft_chain_trans_bind(const struct nft_ctx *ctx,
struct nft_chain *chain)
{
__nft_chain_trans_bind(ctx, chain, true);
}
int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
{
if (!nft_chain_binding(chain))
return 0;
if (nft_chain_binding(ctx->chain))
return -EOPNOTSUPP;
if (chain->bound)
return -EBUSY;
if (!nft_use_inc(&chain->use))
return -EMFILE;
chain->bound = true;
nft_chain_trans_bind(ctx, chain);
return 0;
}
void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
{
__nft_chain_trans_bind(ctx, chain, false);
}
static int nft_netdev_register_hooks(struct net *net,
struct list_head *hook_list)
{
struct nf_hook_ops *ops;
struct nft_hook *hook;
int err, j;
j = 0;
list_for_each_entry(hook, hook_list, list) {
list_for_each_entry(ops, &hook->ops_list, list) {
err = nf_register_net_hook(net, ops);
if (err < 0)
goto err_register;
j++;
}
}
return 0;
err_register:
list_for_each_entry(hook, hook_list, list) {
list_for_each_entry(ops, &hook->ops_list, list) {
if (j-- <= 0)
break;
nf_unregister_net_hook(net, ops);
}
}
return err;
}
static void nft_netdev_hook_free_ops(struct nft_hook *hook)
{
struct nf_hook_ops *ops, *next;
list_for_each_entry_safe(ops, next, &hook->ops_list, list) {
list_del(&ops->list);
kfree(ops);
}
}
static void nft_netdev_hook_free(struct nft_hook *hook)
{
nft_netdev_hook_free_ops(hook);
kfree(hook);
}
static void __nft_netdev_hook_free_rcu(struct rcu_head *rcu)
{
struct nft_hook *hook = container_of(rcu, struct nft_hook, rcu);
nft_netdev_hook_free(hook);
}
static void nft_netdev_hook_free_rcu(struct nft_hook *hook)
{
call_rcu(&hook->rcu, __nft_netdev_hook_free_rcu);
}
static void nft_netdev_unregister_hooks(struct net *net,
struct list_head *hook_list,
bool release_netdev)
{
struct nft_hook *hook, *next;
struct nf_hook_ops *ops;
list_for_each_entry_safe(hook, next, hook_list, list) {
list_for_each_entry(ops, &hook->ops_list, list)
nf_unregister_net_hook(net, ops);
if (release_netdev) {
list_del(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
}
}
static int nf_tables_register_hook(struct net *net,
const struct nft_table *table,
struct nft_chain *chain)
{
struct nft_base_chain *basechain;
const struct nf_hook_ops *ops;
if (table->flags & NFT_TABLE_F_DORMANT ||
!nft_is_base_chain(chain))
return 0;
basechain = nft_base_chain(chain);
ops = &basechain->ops;
if (basechain->type->ops_register)
return basechain->type->ops_register(net, ops);
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
return nft_netdev_register_hooks(net, &basechain->hook_list);
return nf_register_net_hook(net, &basechain->ops);
}
static void __nf_tables_unregister_hook(struct net *net,
const struct nft_table *table,
struct nft_chain *chain,
bool release_netdev)
{
struct nft_base_chain *basechain;
const struct nf_hook_ops *ops;
if (table->flags & NFT_TABLE_F_DORMANT ||
!nft_is_base_chain(chain))
return;
basechain = nft_base_chain(chain);
ops = &basechain->ops;
if (basechain->type->ops_unregister)
return basechain->type->ops_unregister(net, ops);
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
nft_netdev_unregister_hooks(net, &basechain->hook_list,
release_netdev);
else
nf_unregister_net_hook(net, &basechain->ops);
}
static void nf_tables_unregister_hook(struct net *net,
const struct nft_table *table,
struct nft_chain *chain)
{
return __nf_tables_unregister_hook(net, table, chain, false);
}
static bool nft_trans_collapse_set_elem_allowed(const struct nft_trans_elem *a, const struct nft_trans_elem *b)
{
return a->set == b->set && a->bound == b->bound && a->nelems < NFT_MAX_SET_NELEMS;
}
static bool nft_trans_collapse_set_elem(struct nftables_pernet *nft_net,
struct nft_trans_elem *tail,
struct nft_trans_elem *trans)
{
unsigned int nelems, old_nelems = tail->nelems;
struct nft_trans_elem *new_trans;
if (!nft_trans_collapse_set_elem_allowed(tail, trans))
return false;
if (WARN_ON_ONCE(trans->nelems != 1))
return false;
if (check_add_overflow(old_nelems, trans->nelems, &nelems))
return false;
list_del_init(&tail->nft_trans.list);
new_trans = krealloc(tail, struct_size(tail, elems, nelems),
GFP_KERNEL);
if (!new_trans) {
list_add_tail(&tail->nft_trans.list,
&nft_net->commit_list);
return false;
}
new_trans->nelems = nelems;
new_trans->elems[old_nelems] = trans->elems[0];
list_add_tail(&new_trans->nft_trans.list, &nft_net->commit_list);
return true;
}
static bool nft_trans_try_collapse(struct nftables_pernet *nft_net,
struct nft_trans *trans)
{
struct nft_trans *tail;
if (list_empty(&nft_net->commit_list))
return false;
tail = list_last_entry(&nft_net->commit_list, struct nft_trans, list);
if (tail->msg_type != trans->msg_type)
return false;
switch (trans->msg_type) {
case NFT_MSG_NEWSETELEM:
case NFT_MSG_DELSETELEM:
return nft_trans_collapse_set_elem(nft_net,
nft_trans_container_elem(tail),
nft_trans_container_elem(trans));
}
return false;
}
static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_trans_binding *binding;
struct nft_trans_set *trans_set;
list_add_tail(&trans->list, &nft_net->commit_list);
binding = nft_trans_get_binding(trans);
if (!binding)
return;
switch (trans->msg_type) {
case NFT_MSG_NEWSET:
trans_set = nft_trans_container_set(trans);
if (!nft_trans_set_update(trans) &&
nft_set_is_anonymous(nft_trans_set(trans)))
list_add_tail(&binding->binding_list, &nft_net->binding_list);
list_add_tail(&trans_set->list_trans_newset, &nft_net->commit_set_list);
break;
case NFT_MSG_NEWCHAIN:
if (!nft_trans_chain_update(trans) &&
nft_chain_binding(nft_trans_chain(trans)))
list_add_tail(&binding->binding_list, &nft_net->binding_list);
break;
}
}
static void nft_trans_commit_list_add_elem(struct net *net, struct nft_trans *trans)
{
struct nftables_pernet *nft_net = nft_pernet(net);
WARN_ON_ONCE(trans->msg_type != NFT_MSG_NEWSETELEM &&
trans->msg_type != NFT_MSG_DELSETELEM);
if (nft_trans_try_collapse(nft_net, trans)) {
kfree(trans);
return;
}
nft_trans_commit_list_add_tail(net, trans);
}
static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
{
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
if (trans == NULL)
return -ENOMEM;
if (msg_type == NFT_MSG_NEWTABLE)
nft_activate_next(ctx->net, ctx->table);
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
}
static int nft_deltable(struct nft_ctx *ctx)
{
int err;
err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
if (err < 0)
return err;
nft_deactivate_next(ctx->net, ctx->table);
return err;
}
static struct nft_trans *
nft_trans_alloc_chain(const struct nft_ctx *ctx, int msg_type)
{
struct nft_trans_chain *trans_chain;
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
if (!trans)
return NULL;
trans_chain = nft_trans_container_chain(trans);
INIT_LIST_HEAD(&trans_chain->nft_trans_binding.binding_list);
trans_chain->chain = ctx->chain;
return trans;
}
static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
{
struct nft_trans *trans;
trans = nft_trans_alloc_chain(ctx, msg_type);
if (trans == NULL)
return ERR_PTR(-ENOMEM);
if (msg_type == NFT_MSG_NEWCHAIN) {
nft_activate_next(ctx->net, ctx->chain);
if (ctx->nla[NFTA_CHAIN_ID]) {
nft_trans_chain_id(trans) =
ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
}
}
nft_trans_commit_list_add_tail(ctx->net, trans);
return trans;
}
static int nft_delchain(struct nft_ctx *ctx)
{
struct nft_trans *trans;
trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
if (IS_ERR(trans))
return PTR_ERR(trans);
nft_use_dec(&ctx->table->use);
nft_deactivate_next(ctx->net, ctx->chain);
return 0;
}
void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
{
struct nft_expr *expr;
expr = nft_expr_first(rule);
while (nft_expr_more(rule, expr)) {
if (expr->ops->activate)
expr->ops->activate(ctx, expr);
expr = nft_expr_next(expr);
}
}
void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
enum nft_trans_phase phase)
{
struct nft_expr *expr;
expr = nft_expr_first(rule);
while (nft_expr_more(rule, expr)) {
if (expr->ops->deactivate)
expr->ops->deactivate(ctx, expr, phase);
expr = nft_expr_next(expr);
}
}
static int
nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
{
if (nft_is_active_next(ctx->net, rule)) {
nft_deactivate_next(ctx->net, rule);
nft_use_dec(&ctx->chain->use);
return 0;
}
return -ENOENT;
}
static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
struct nft_rule *rule)
{
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
if (trans == NULL)
return NULL;
if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
nft_trans_rule_id(trans) =
ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
}
nft_trans_rule(trans) = rule;
nft_trans_rule_chain(trans) = ctx->chain;
nft_trans_commit_list_add_tail(ctx->net, trans);
return trans;
}
static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
{
struct nft_flow_rule *flow;
struct nft_trans *trans;
int err;
trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
if (trans == NULL)
return -ENOMEM;
if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
flow = nft_flow_rule_create(ctx->net, rule);
if (IS_ERR(flow)) {
nft_trans_destroy(trans);
return PTR_ERR(flow);
}
nft_trans_flow_rule(trans) = flow;
}
err = nf_tables_delrule_deactivate(ctx, rule);
if (err < 0) {
nft_trans_destroy(trans);
return err;
}
nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
return 0;
}
static int nft_delrule_by_chain(struct nft_ctx *ctx)
{
struct nft_rule *rule;
int err;
list_for_each_entry(rule, &ctx->chain->rules, list) {
if (!nft_is_active_next(ctx->net, rule))
continue;
err = nft_delrule(ctx, rule);
if (err < 0)
return err;
}
return 0;
}
static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
struct nft_set *set,
const struct nft_set_desc *desc)
{
struct nft_trans_set *trans_set;
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
if (trans == NULL)
return -ENOMEM;
trans_set = nft_trans_container_set(trans);
INIT_LIST_HEAD(&trans_set->nft_trans_binding.binding_list);
INIT_LIST_HEAD(&trans_set->list_trans_newset);
if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
nft_trans_set_id(trans) =
ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
nft_activate_next(ctx->net, set);
}
nft_trans_set(trans) = set;
if (desc) {
nft_trans_set_update(trans) = true;
nft_trans_set_gc_int(trans) = desc->gc_int;
nft_trans_set_timeout(trans) = desc->timeout;
nft_trans_set_size(trans) = desc->size;
}
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
}
static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
struct nft_set *set)
{
return __nft_trans_set_add(ctx, msg_type, set, NULL);
}
static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (!nft_set_elem_active(ext, iter->genmask))
return 0;
nft_set_elem_change_active(ctx->net, set, ext);
nft_setelem_data_deactivate(ctx->net, set, elem_priv);
return 0;
}
struct nft_set_elem_catchall {
struct list_head list;
struct rcu_head rcu;
struct nft_elem_priv *elem;
};
static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
struct nft_set *set)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
list_for_each_entry(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, genmask))
continue;
nft_set_elem_change_active(ctx->net, set, ext);
nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
}
}
static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
{
struct nft_set_iter iter = {
.genmask = nft_genmask_next(ctx->net),
.type = NFT_ITER_UPDATE,
.fn = nft_mapelem_deactivate,
};
set->ops->walk(ctx, set, &iter);
WARN_ON_ONCE(iter.err);
nft_map_catchall_deactivate(ctx, set);
}
static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
{
int err;
err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
if (err < 0)
return err;
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_deactivate(ctx, set);
nft_deactivate_next(ctx->net, set);
nft_use_dec(&ctx->table->use);
return err;
}
static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
struct nft_object *obj)
{
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
if (trans == NULL)
return -ENOMEM;
if (msg_type == NFT_MSG_NEWOBJ)
nft_activate_next(ctx->net, obj);
nft_trans_obj(trans) = obj;
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
}
static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
{
int err;
err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
if (err < 0)
return err;
nft_deactivate_next(ctx->net, obj);
nft_use_dec(&ctx->table->use);
return err;
}
static struct nft_trans *
nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
struct nft_flowtable *flowtable)
{
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type,
sizeof(struct nft_trans_flowtable));
if (trans == NULL)
return ERR_PTR(-ENOMEM);
if (msg_type == NFT_MSG_NEWFLOWTABLE)
nft_activate_next(ctx->net, flowtable);
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
nft_trans_flowtable(trans) = flowtable;
nft_trans_commit_list_add_tail(ctx->net, trans);
return trans;
}
static int nft_delflowtable(struct nft_ctx *ctx,
struct nft_flowtable *flowtable)
{
struct nft_trans *trans;
trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
if (IS_ERR(trans))
return PTR_ERR(trans);
nft_deactivate_next(ctx->net, flowtable);
nft_use_dec(&ctx->table->use);
return 0;
}
static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
{
int i;
for (i = track->regs[dreg].num_reg; i > 0; i--)
__nft_reg_track_cancel(track, dreg - i);
}
static void __nft_reg_track_update(struct nft_regs_track *track,
const struct nft_expr *expr,
u8 dreg, u8 num_reg)
{
track->regs[dreg].selector = expr;
track->regs[dreg].bitwise = NULL;
track->regs[dreg].num_reg = num_reg;
}
void nft_reg_track_update(struct nft_regs_track *track,
const struct nft_expr *expr, u8 dreg, u8 len)
{
unsigned int regcount;
int i;
__nft_reg_track_clobber(track, dreg);
regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
for (i = 0; i < regcount; i++, dreg++)
__nft_reg_track_update(track, expr, dreg, i);
}
EXPORT_SYMBOL_GPL(nft_reg_track_update);
void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
{
unsigned int regcount;
int i;
__nft_reg_track_clobber(track, dreg);
regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
for (i = 0; i < regcount; i++, dreg++)
__nft_reg_track_cancel(track, dreg);
}
EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
{
track->regs[dreg].selector = NULL;
track->regs[dreg].bitwise = NULL;
track->regs[dreg].num_reg = 0;
}
EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
static struct nft_table *nft_table_lookup(const struct net *net,
const struct nlattr *nla,
u8 family, u8 genmask, u32 nlpid)
{
struct nftables_pernet *nft_net;
struct nft_table *table;
if (nla == NULL)
return ERR_PTR(-EINVAL);
nft_net = nft_pernet(net);
list_for_each_entry_rcu(table, &nft_net->tables, list,
lockdep_is_held(&nft_net->commit_mutex)) {
if (!nla_strcmp(nla, table->name) &&
table->family == family &&
nft_active_genmask(table, genmask)) {
if (nft_table_has_owner(table) &&
nlpid && table->nlpid != nlpid)
return ERR_PTR(-EPERM);
return table;
}
}
return ERR_PTR(-ENOENT);
}
static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
const struct nlattr *nla,
int family, u8 genmask, u32 nlpid)
{
struct nftables_pernet *nft_net;
struct nft_table *table;
nft_net = nft_pernet(net);
list_for_each_entry(table, &nft_net->tables, list) {
if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
table->family == family &&
nft_active_genmask(table, genmask)) {
if (nft_table_has_owner(table) &&
nlpid && table->nlpid != nlpid)
return ERR_PTR(-EPERM);
return table;
}
}
return ERR_PTR(-ENOENT);
}
static inline u64 nf_tables_alloc_handle(struct nft_table *table)
{
return ++table->hgenerator;
}
static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
static const struct nft_chain_type *
__nft_chain_type_get(u8 family, enum nft_chain_types type)
{
if (family >= NFPROTO_NUMPROTO ||
type >= NFT_CHAIN_T_MAX)
return NULL;
return chain_type[family][type];
}
static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
{
const struct nft_chain_type *type;
int i;
for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
type = __nft_chain_type_get(family, i);
if (!type)
continue;
if (!nla_strcmp(nla, type->name))
return type;
}
return NULL;
}
struct nft_module_request {
struct list_head list;
char module[MODULE_NAME_LEN];
bool done;
};
#ifdef CONFIG_MODULES
__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
...)
{
char module_name[MODULE_NAME_LEN];
struct nftables_pernet *nft_net;
struct nft_module_request *req;
va_list args;
int ret;
va_start(args, fmt);
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
va_end(args);
if (ret >= MODULE_NAME_LEN)
return 0;
nft_net = nft_pernet(net);
list_for_each_entry(req, &nft_net->module_list, list) {
if (!strcmp(req->module, module_name)) {
if (req->done)
return 0;
return -EAGAIN;
}
}
req = kmalloc_obj(*req);
if (!req)
return -ENOMEM;
req->done = false;
strscpy(req->module, module_name, MODULE_NAME_LEN);
list_add_tail(&req->list, &nft_net->module_list);
return -EAGAIN;
}
EXPORT_SYMBOL_GPL(nft_request_module);
#endif
static void lockdep_nfnl_nft_mutex_not_held(void)
{
#ifdef CONFIG_PROVE_LOCKING
if (debug_locks)
WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
#endif
}
static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
u8 family, bool autoload)
{
const struct nft_chain_type *type;
type = __nf_tables_chain_type_lookup(nla, family);
if (type != NULL)
return type;
lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
if (autoload) {
if (nft_request_module(net, "nft-chain-%u-%.*s", family,
nla_len(nla),
(const char *)nla_data(nla)) == -EAGAIN)
return ERR_PTR(-EAGAIN);
}
#endif
return ERR_PTR(-ENOENT);
}
static unsigned int nft_base_seq(const struct net *net)
{
return READ_ONCE(net->nft.base_seq);
}
static __be16 nft_base_seq_be16(const struct net *net)
{
return htons(nft_base_seq(net) & 0xffff);
}
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
[NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
[NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN }
};
static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event, u32 flags,
int family, const struct nft_table *table)
{
struct nlmsghdr *nlh;
nlh = nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event),
flags, family, NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
NFTA_TABLE_PAD))
goto nla_put_failure;
if (event == NFT_MSG_DELTABLE ||
event == NFT_MSG_DESTROYTABLE) {
nlmsg_end(skb, nlh);
return 0;
}
if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
htonl(table->flags & NFT_TABLE_F_MASK)))
goto nla_put_failure;
if (nft_table_has_owner(table) &&
nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
goto nla_put_failure;
if (table->udata) {
if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
goto nla_put_failure;
}
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
struct nftnl_skb_parms {
bool report;
};
#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
static void nft_notify_enqueue(struct sk_buff *skb, bool report,
struct list_head *notify_list)
{
NFT_CB(skb).report = report;
list_add_tail(&skb->list, notify_list);
}
static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
{
struct nftables_pernet *nft_net;
struct sk_buff *skb;
u16 flags = 0;
int err;
if (!ctx->report &&
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
goto err;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
event, flags, ctx->family, ctx->table);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_net = nft_pernet(ctx->net);
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static int nf_tables_dump_tables(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
struct nftables_pernet *nft_net;
const struct nft_table *table;
unsigned int idx = 0, s_idx = cb->args[0];
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (family != NFPROTO_UNSPEC && family != table->family)
continue;
if (idx < s_idx)
goto cont;
if (idx > s_idx)
memset(&cb->args[1], 0,
sizeof(cb->args) - sizeof(cb->args[0]));
if (!nft_is_active(net, table))
continue;
if (nf_tables_fill_table_info(skb, net,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWTABLE, NLM_F_MULTI,
table->family, table) < 0)
goto done;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
done:
rcu_read_unlock();
cb->args[0] = idx;
return skb->len;
}
static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct netlink_dump_control *c)
{
int err;
if (!try_module_get(THIS_MODULE))
return -EINVAL;
rcu_read_unlock();
err = netlink_dump_start(nlsk, skb, nlh, c);
rcu_read_lock();
module_put(THIS_MODULE);
return err;
}
static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_table *table;
struct net *net = info->net;
struct sk_buff *skb2;
int err;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = nf_tables_dump_tables,
.module = THIS_MODULE,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
return PTR_ERR(table);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
0, family, table);
if (err < 0)
goto err_fill_table_info;
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_table_info:
kfree_skb(skb2);
return err;
}
static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
{
struct nft_chain *chain;
u32 i = 0;
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (!nft_is_base_chain(chain))
continue;
if (cnt && i++ == cnt)
break;
nf_tables_unregister_hook(net, table, chain);
}
}
static int nf_tables_table_enable(struct net *net, struct nft_table *table)
{
struct nft_chain *chain;
int err, i = 0;
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (!nft_is_base_chain(chain))
continue;
err = nf_tables_register_hook(net, table, chain);
if (err < 0)
goto err_register_hooks;
i++;
}
return 0;
err_register_hooks:
if (i)
nft_table_disable(net, table, i);
return err;
}
static void nf_tables_table_disable(struct net *net, struct nft_table *table)
{
table->flags &= ~NFT_TABLE_F_DORMANT;
nft_table_disable(net, table, 0);
table->flags |= NFT_TABLE_F_DORMANT;
}
#define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
#define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
#define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
#define __NFT_TABLE_F_WAS_ORPHAN (__NFT_TABLE_F_INTERNAL << 2)
#define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
__NFT_TABLE_F_WAS_AWAKEN | \
__NFT_TABLE_F_WAS_ORPHAN)
static bool nft_table_pending_update(const struct nft_ctx *ctx)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
struct nft_trans *trans;
if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
return true;
list_for_each_entry(trans, &nft_net->commit_list, list) {
if (trans->table == ctx->table &&
((trans->msg_type == NFT_MSG_NEWCHAIN &&
nft_trans_chain_update(trans)) ||
(trans->msg_type == NFT_MSG_DELCHAIN &&
nft_is_base_chain(nft_trans_chain(trans)))))
return true;
}
return false;
}
static int nf_tables_updtable(struct nft_ctx *ctx)
{
struct nft_trans *trans;
u32 flags;
int ret;
if (!ctx->nla[NFTA_TABLE_FLAGS])
return 0;
flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_MASK)
return -EOPNOTSUPP;
if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
return 0;
if ((nft_table_has_owner(ctx->table) &&
!(flags & NFT_TABLE_F_OWNER)) ||
(flags & NFT_TABLE_F_OWNER &&
!nft_table_is_orphan(ctx->table)))
return -EOPNOTSUPP;
if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
return -EOPNOTSUPP;
if (nft_table_pending_update(ctx))
return -EINVAL;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table));
if (trans == NULL)
return -ENOMEM;
if ((flags & NFT_TABLE_F_DORMANT) &&
!(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
ctx->table->flags |= NFT_TABLE_F_DORMANT;
if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
ctx->table->flags & NFT_TABLE_F_DORMANT) {
ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
ret = nf_tables_table_enable(ctx->net, ctx->table);
if (ret < 0)
goto err_register_hooks;
ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
}
}
if ((flags & NFT_TABLE_F_OWNER) &&
!nft_table_has_owner(ctx->table)) {
ctx->table->nlpid = ctx->portid;
ctx->table->flags |= NFT_TABLE_F_OWNER |
__NFT_TABLE_F_WAS_ORPHAN;
}
nft_trans_table_update(trans) = true;
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_register_hooks:
ctx->table->flags |= NFT_TABLE_F_DORMANT;
nft_trans_destroy(trans);
return ret;
}
static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
{
const char *name = data;
return jhash(name, strlen(name), seed);
}
static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
{
const struct nft_chain *chain = data;
return nft_chain_hash(chain->name, 0, seed);
}
static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct nft_chain *chain = ptr;
const char *name = arg->key;
return strcmp(chain->name, name);
}
static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
{
const struct nft_object_hash_key *k = data;
seed ^= hash_ptr(k->table, 32);
return jhash(k->name, strlen(k->name), seed);
}
static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
{
const struct nft_object *obj = data;
return nft_objname_hash(&obj->key, 0, seed);
}
static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct nft_object_hash_key *k = arg->key;
const struct nft_object *obj = ptr;
if (obj->key.table != k->table)
return -1;
return strcmp(obj->key.name, k->name);
}
static bool nft_supported_family(u8 family)
{
return false
#ifdef CONFIG_NF_TABLES_INET
|| family == NFPROTO_INET
#endif
#ifdef CONFIG_NF_TABLES_IPV4
|| family == NFPROTO_IPV4
#endif
#ifdef CONFIG_NF_TABLES_ARP
|| family == NFPROTO_ARP
#endif
#ifdef CONFIG_NF_TABLES_NETDEV
|| family == NFPROTO_NETDEV
#endif
#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
|| family == NFPROTO_BRIDGE
#endif
#ifdef CONFIG_NF_TABLES_IPV6
|| family == NFPROTO_IPV6
#endif
;
}
static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct nftables_pernet *nft_net = nft_pernet(info->net);
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_ctx ctx;
u32 flags = 0;
int err;
if (!nft_supported_family(family))
return -EOPNOTSUPP;
lockdep_assert_held(&nft_net->commit_mutex);
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
if (PTR_ERR(table) != -ENOENT)
return PTR_ERR(table);
} else {
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
return nf_tables_updtable(&ctx);
}
if (nla[NFTA_TABLE_FLAGS]) {
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_MASK)
return -EOPNOTSUPP;
}
err = -ENOMEM;
table = kzalloc_obj(*table, GFP_KERNEL_ACCOUNT);
if (table == NULL)
goto err_kzalloc;
table->validate_state = nft_net->validate_state;
table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
if (table->name == NULL)
goto err_strdup;
if (nla[NFTA_TABLE_USERDATA]) {
table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
if (table->udata == NULL)
goto err_table_udata;
table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
}
err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
if (err)
goto err_chain_ht;
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
INIT_LIST_HEAD(&table->objects);
INIT_LIST_HEAD(&table->flowtables);
table->family = family;
table->flags = flags;
table->handle = ++nft_net->table_handle;
if (table->flags & NFT_TABLE_F_OWNER)
table->nlpid = NETLINK_CB(skb).portid;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
if (err < 0)
goto err_trans;
list_add_tail_rcu(&table->list, &nft_net->tables);
return 0;
err_trans:
rhltable_destroy(&table->chains_ht);
err_chain_ht:
kfree(table->udata);
err_table_udata:
kfree(table->name);
err_strdup:
kfree(table);
err_kzalloc:
return err;
}
static int nft_flush_table(struct nft_ctx *ctx)
{
struct nft_flowtable *flowtable, *nft;
struct nft_chain *chain, *nc;
struct nft_object *obj, *ne;
struct nft_set *set, *ns;
int err;
list_for_each_entry(chain, &ctx->table->chains, list) {
if (!nft_is_active_next(ctx->net, chain))
continue;
if (nft_chain_binding(chain))
continue;
ctx->chain = chain;
err = nft_delrule_by_chain(ctx);
if (err < 0)
goto out;
}
list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, set))
continue;
if (nft_set_is_anonymous(set))
continue;
err = nft_delset(ctx, set);
if (err < 0)
goto out;
}
list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
if (!nft_is_active_next(ctx->net, flowtable))
continue;
err = nft_delflowtable(ctx, flowtable);
if (err < 0)
goto out;
}
list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
if (!nft_is_active_next(ctx->net, obj))
continue;
err = nft_delobj(ctx, obj);
if (err < 0)
goto out;
}
list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
if (!nft_is_active_next(ctx->net, chain))
continue;
if (nft_chain_binding(chain))
continue;
ctx->chain = chain;
err = nft_delchain(ctx);
if (err < 0)
goto out;
}
err = nft_deltable(ctx);
out:
return err;
}
static int nft_flush(struct nft_ctx *ctx, int family)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
const struct nlattr * const *nla = ctx->nla;
struct nft_table *table, *nt;
int err = 0;
list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
if (family != AF_UNSPEC && table->family != family)
continue;
ctx->family = table->family;
if (!nft_is_active_next(ctx->net, table))
continue;
if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
continue;
if (nla[NFTA_TABLE_NAME] &&
nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
continue;
ctx->table = table;
err = nft_flush_table(ctx);
if (err < 0)
goto out;
}
out:
return err;
}
static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_ctx ctx;
nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
if (family == AF_UNSPEC ||
(!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
return nft_flush(&ctx, family);
if (nla[NFTA_TABLE_HANDLE]) {
attr = nla[NFTA_TABLE_HANDLE];
table = nft_table_lookup_byhandle(net, attr, family, genmask,
NETLINK_CB(skb).portid);
} else {
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask,
NETLINK_CB(skb).portid);
}
if (IS_ERR(table)) {
if (PTR_ERR(table) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
return 0;
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(table);
}
if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
table->use > 0)
return -EBUSY;
ctx.family = family;
ctx.table = table;
return nft_flush_table(&ctx);
}
static void nf_tables_table_destroy(struct nft_table *table)
{
if (WARN_ON(table->use > 0))
return;
rhltable_destroy(&table->chains_ht);
kfree(table->name);
kfree(table->udata);
kfree(table);
}
void nft_register_chain_type(const struct nft_chain_type *ctype)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
return;
}
chain_type[ctype->family][ctype->type] = ctype;
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_register_chain_type);
void nft_unregister_chain_type(const struct nft_chain_type *ctype)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
chain_type[ctype->family][ctype->type] = NULL;
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
{
struct nft_chain *chain;
list_for_each_entry(chain, &table->chains, list) {
if (chain->handle == handle &&
nft_active_genmask(chain, genmask))
return chain;
}
return ERR_PTR(-ENOENT);
}
static bool lockdep_commit_lock_is_held(const struct net *net)
{
#ifdef CONFIG_PROVE_LOCKING
struct nftables_pernet *nft_net = nft_pernet(net);
return lockdep_is_held(&nft_net->commit_mutex);
#else
return true;
#endif
}
static struct nft_chain *nft_chain_lookup(struct net *net,
struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
char search[NFT_CHAIN_MAXNAMELEN + 1];
struct rhlist_head *tmp, *list;
struct nft_chain *chain;
if (nla == NULL)
return ERR_PTR(-EINVAL);
nla_strscpy(search, nla, sizeof(search));
WARN_ON(!rcu_read_lock_held() &&
!lockdep_commit_lock_is_held(net));
chain = ERR_PTR(-ENOENT);
rcu_read_lock();
list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
if (!list)
goto out_unlock;
rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
if (nft_active_genmask(chain, genmask))
goto out_unlock;
}
chain = ERR_PTR(-ENOENT);
out_unlock:
rcu_read_unlock();
return chain;
}
static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
[NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
[NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
[NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
.len = NFT_MODULE_AUTOLOAD_LIMIT },
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
[NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
[NFTA_CHAIN_ID] = { .type = NLA_U32 },
[NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
};
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
[NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
[NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
[NFTA_HOOK_DEV] = { .type = NLA_STRING,
.len = IFNAMSIZ - 1 },
};
static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
{
struct nft_stats *cpu_stats, total;
struct nlattr *nest;
unsigned int seq;
u64 pkts, bytes;
int cpu;
if (!stats)
return 0;
memset(&total, 0, sizeof(total));
for_each_possible_cpu(cpu) {
cpu_stats = per_cpu_ptr(stats, cpu);
do {
seq = u64_stats_fetch_begin(&cpu_stats->syncp);
pkts = cpu_stats->pkts;
bytes = cpu_stats->bytes;
} while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
total.pkts += pkts;
total.bytes += bytes;
}
nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
if (nest == NULL)
goto nla_put_failure;
if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
NFTA_COUNTER_PAD) ||
nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
NFTA_COUNTER_PAD))
goto nla_put_failure;
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
return -ENOSPC;
}
static bool hook_is_prefix(struct nft_hook *hook)
{
return strlen(hook->ifname) >= hook->ifnamelen;
}
static int nft_nla_put_hook_dev(struct sk_buff *skb, struct nft_hook *hook)
{
int attr = hook_is_prefix(hook) ? NFTA_DEVICE_PREFIX : NFTA_DEVICE_NAME;
return nla_put_string(skb, attr, hook->ifname);
}
static int nft_dump_basechain_hook(struct sk_buff *skb,
const struct net *net, int family,
const struct nft_base_chain *basechain,
const struct list_head *hook_list)
{
const struct nf_hook_ops *ops = &basechain->ops;
struct nft_hook *hook, *first = NULL;
struct nlattr *nest, *nest_devs;
int n = 0;
nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
if (nest == NULL)
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
goto nla_put_failure;
if (nft_base_chain_netdev(family, ops->hooknum)) {
nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
if (!nest_devs)
goto nla_put_failure;
if (!hook_list)
hook_list = &basechain->hook_list;
list_for_each_entry_rcu(hook, hook_list, list,
lockdep_commit_lock_is_held(net)) {
if (!first)
first = hook;
if (nft_nla_put_hook_dev(skb, hook))
goto nla_put_failure;
n++;
}
nla_nest_end(skb, nest_devs);
if (n == 1 &&
!hook_is_prefix(first) &&
nla_put_string(skb, NFTA_HOOK_DEV, first->ifname))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
return -1;
}
static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event, u32 flags,
int family, const struct nft_table *table,
const struct nft_chain *chain,
const struct list_head *hook_list)
{
struct nlmsghdr *nlh;
nlh = nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event),
flags, family, NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
NFTA_CHAIN_PAD))
goto nla_put_failure;
if (!hook_list &&
(event == NFT_MSG_DELCHAIN ||
event == NFT_MSG_DESTROYCHAIN)) {
nlmsg_end(skb, nlh);
return 0;
}
if (nft_is_base_chain(chain)) {
const struct nft_base_chain *basechain = nft_base_chain(chain);
struct nft_stats __percpu *stats;
if (nft_dump_basechain_hook(skb, net, family, basechain, hook_list))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
htonl(basechain->policy)))
goto nla_put_failure;
if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
goto nla_put_failure;
stats = rcu_dereference_check(basechain->stats,
lockdep_commit_lock_is_held(net));
if (nft_dump_stats(skb, stats))
goto nla_put_failure;
}
if (chain->flags &&
nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
goto nla_put_failure;
if (chain->udata &&
nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
const struct list_head *hook_list)
{
struct nftables_pernet *nft_net;
struct sk_buff *skb;
u16 flags = 0;
int err;
if (!ctx->report &&
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
goto err;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
event, flags, ctx->family, ctx->table,
ctx->chain, hook_list);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_net = nft_pernet(ctx->net);
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static int nf_tables_dump_chains(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
unsigned int idx = 0, s_idx = cb->args[0];
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct nftables_pernet *nft_net;
const struct nft_table *table;
const struct nft_chain *chain;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (family != NFPROTO_UNSPEC && family != table->family)
continue;
list_for_each_entry_rcu(chain, &table->chains, list) {
if (idx < s_idx)
goto cont;
if (idx > s_idx)
memset(&cb->args[1], 0,
sizeof(cb->args) - sizeof(cb->args[0]));
if (!nft_is_active(net, chain))
continue;
if (nf_tables_fill_chain_info(skb, net,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWCHAIN,
NLM_F_MULTI,
table->family, table,
chain, NULL) < 0)
goto done;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
}
done:
rcu_read_unlock();
cb->args[0] = idx;
return skb->len;
}
static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_chain *chain;
struct net *net = info->net;
struct nft_table *table;
struct sk_buff *skb2;
int err;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = nf_tables_dump_chains,
.module = THIS_MODULE,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
}
chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
if (IS_ERR(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
return PTR_ERR(chain);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
0, family, table, chain, NULL);
if (err < 0)
goto err_fill_chain_info;
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_chain_info:
kfree_skb(skb2);
return err;
}
static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
};
static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
{
struct nlattr *tb[NFTA_COUNTER_MAX+1];
struct nft_stats __percpu *newstats;
struct nft_stats *stats;
int err;
err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
nft_counter_policy, NULL);
if (err < 0)
return ERR_PTR_PCPU(err);
if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
return ERR_PTR_PCPU(-EINVAL);
newstats = netdev_alloc_pcpu_stats(struct nft_stats);
if (newstats == NULL)
return ERR_PTR_PCPU(-ENOMEM);
preempt_disable();
stats = this_cpu_ptr(newstats);
stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
preempt_enable();
return newstats;
}
static void nft_chain_stats_replace(struct nft_trans_chain *trans)
{
const struct nft_trans *t = &trans->nft_trans_binding.nft_trans;
struct nft_base_chain *chain = nft_base_chain(trans->chain);
if (!trans->stats)
return;
trans->stats =
rcu_replace_pointer(chain->stats, trans->stats,
lockdep_commit_lock_is_held(t->net));
if (!trans->stats)
static_branch_inc(&nft_counters_enabled);
}
static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
{
struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
if (g0 != g1)
kvfree(g1);
kvfree(g0);
WARN_ON_ONCE(chain->blob_next);
kvfree(chain->blob_next);
}
void nf_tables_chain_destroy(struct nft_chain *chain)
{
const struct nft_table *table = chain->table;
struct nft_hook *hook, *next;
if (WARN_ON(chain->use > 0))
return;
nf_tables_chain_free_chain_rules(chain);
if (nft_is_base_chain(chain)) {
struct nft_base_chain *basechain = nft_base_chain(chain);
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
list_for_each_entry_safe(hook, next,
&basechain->hook_list, list) {
list_del_rcu(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
}
module_put(basechain->type->owner);
if (rcu_access_pointer(basechain->stats)) {
static_branch_dec(&nft_counters_enabled);
free_percpu(rcu_dereference_raw(basechain->stats));
}
kfree(chain->name);
kfree(chain->udata);
kfree(basechain);
} else {
kfree(chain->name);
kfree(chain->udata);
kfree(chain);
}
}
static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
const struct nlattr *attr,
bool prefix)
{
struct nf_hook_ops *ops;
struct net_device *dev;
struct nft_hook *hook;
int err;
hook = kzalloc_obj(struct nft_hook, GFP_KERNEL_ACCOUNT);
if (!hook)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&hook->ops_list);
err = nla_strscpy(hook->ifname, attr, IFNAMSIZ);
if (err < 0)
goto err_hook_free;
hook->ifnamelen = strlen(hook->ifname) + !prefix;
for_each_netdev(net, dev) {
if (strncmp(dev->name, hook->ifname, hook->ifnamelen))
continue;
ops = kzalloc_obj(struct nf_hook_ops, GFP_KERNEL_ACCOUNT);
if (!ops) {
err = -ENOMEM;
goto err_hook_free;
}
ops->dev = dev;
list_add_tail(&ops->list, &hook->ops_list);
}
return hook;
err_hook_free:
nft_netdev_hook_free(hook);
return ERR_PTR(err);
}
static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
const struct nft_hook *this)
{
struct nft_hook *hook;
list_for_each_entry(hook, hook_list, list) {
if (!strncmp(hook->ifname, this->ifname,
min(hook->ifnamelen, this->ifnamelen)))
return hook;
}
return NULL;
}
static int nf_tables_parse_netdev_hooks(struct net *net,
const struct nlattr *attr,
struct list_head *hook_list,
struct netlink_ext_ack *extack)
{
struct nft_hook *hook, *next;
const struct nlattr *tmp;
int rem, n = 0, err;
bool prefix;
nla_for_each_nested(tmp, attr, rem) {
switch (nla_type(tmp)) {
case NFTA_DEVICE_NAME:
prefix = false;
break;
case NFTA_DEVICE_PREFIX:
prefix = true;
break;
default:
err = -EINVAL;
goto err_hook;
}
hook = nft_netdev_hook_alloc(net, tmp, prefix);
if (IS_ERR(hook)) {
NL_SET_BAD_ATTR(extack, tmp);
err = PTR_ERR(hook);
goto err_hook;
}
if (nft_hook_list_find(hook_list, hook)) {
NL_SET_BAD_ATTR(extack, tmp);
nft_netdev_hook_free(hook);
err = -EEXIST;
goto err_hook;
}
list_add_tail(&hook->list, hook_list);
n++;
if (n == NFT_NETDEVICE_MAX) {
err = -EFBIG;
goto err_hook;
}
}
return 0;
err_hook:
list_for_each_entry_safe(hook, next, hook_list, list) {
list_del(&hook->list);
nft_netdev_hook_free(hook);
}
return err;
}
struct nft_chain_hook {
u32 num;
s32 priority;
const struct nft_chain_type *type;
struct list_head list;
};
static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
struct list_head *hook_list,
struct netlink_ext_ack *extack, u32 flags)
{
struct nft_hook *hook;
int err;
if (tb[NFTA_HOOK_DEV]) {
hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV], false);
if (IS_ERR(hook)) {
NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
return PTR_ERR(hook);
}
list_add_tail(&hook->list, hook_list);
} else if (tb[NFTA_HOOK_DEVS]) {
err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
hook_list, extack);
if (err < 0)
return err;
}
if (flags & NFT_CHAIN_HW_OFFLOAD &&
list_empty(hook_list))
return -EINVAL;
return 0;
}
static int nft_chain_parse_hook(struct net *net,
struct nft_base_chain *basechain,
const struct nlattr * const nla[],
struct nft_chain_hook *hook, u8 family,
u32 flags, struct netlink_ext_ack *extack)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nlattr *ha[NFTA_HOOK_MAX + 1];
const struct nft_chain_type *type;
int err;
lockdep_assert_held(&nft_net->commit_mutex);
lockdep_nfnl_nft_mutex_not_held();
err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
nla[NFTA_CHAIN_HOOK],
nft_hook_policy, NULL);
if (err < 0)
return err;
if (!basechain) {
if (!ha[NFTA_HOOK_HOOKNUM] ||
!ha[NFTA_HOOK_PRIORITY]) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
return -ENOENT;
}
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
if (!type)
return -EOPNOTSUPP;
if (nla[NFTA_CHAIN_TYPE]) {
type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
family, true);
if (IS_ERR(type)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
return PTR_ERR(type);
}
}
if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
return -EOPNOTSUPP;
if (type->type == NFT_CHAIN_T_NAT &&
hook->priority <= NF_IP_PRI_CONNTRACK)
return -EOPNOTSUPP;
} else {
if (ha[NFTA_HOOK_HOOKNUM]) {
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
if (hook->num != basechain->ops.hooknum)
return -EOPNOTSUPP;
}
if (ha[NFTA_HOOK_PRIORITY]) {
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
if (hook->priority != basechain->ops.priority)
return -EOPNOTSUPP;
}
if (nla[NFTA_CHAIN_TYPE]) {
type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
family);
if (!type) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
return -ENOENT;
}
} else {
type = basechain->type;
}
}
if (!try_module_get(type->owner)) {
if (nla[NFTA_CHAIN_TYPE])
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
return -ENOENT;
}
hook->type = type;
INIT_LIST_HEAD(&hook->list);
if (nft_base_chain_netdev(family, hook->num)) {
err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
if (err < 0) {
module_put(type->owner);
return err;
}
} else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
module_put(type->owner);
return -EOPNOTSUPP;
}
return 0;
}
static void nft_chain_release_hook(struct nft_chain_hook *hook)
{
struct nft_hook *h, *next;
list_for_each_entry_safe(h, next, &hook->list, list) {
list_del(&h->list);
nft_netdev_hook_free(h);
}
module_put(hook->type->owner);
}
static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
{
struct nft_rule_dp_last *lrule;
BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
lrule = (struct nft_rule_dp_last *)ptr;
lrule->end.is_last = 1;
lrule->chain = chain;
}
static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
unsigned int size)
{
struct nft_rule_blob *blob;
if (size > INT_MAX)
return NULL;
size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
if (!blob)
return NULL;
blob->size = 0;
nft_last_rule(chain, blob->data);
return blob;
}
static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
const struct nft_chain_hook *hook,
struct nft_chain *chain)
{
ops->pf = family;
ops->hooknum = hook->num;
ops->priority = hook->priority;
ops->priv = chain;
ops->hook = hook->type->hooks[ops->hooknum];
ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
}
static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
struct nft_chain_hook *hook, u32 flags)
{
struct nft_chain *chain;
struct nf_hook_ops *ops;
struct nft_hook *h;
basechain->type = hook->type;
INIT_LIST_HEAD(&basechain->hook_list);
chain = &basechain->chain;
if (nft_base_chain_netdev(family, hook->num)) {
list_splice_init(&hook->list, &basechain->hook_list);
list_for_each_entry(h, &basechain->hook_list, list) {
list_for_each_entry(ops, &h->ops_list, list)
nft_basechain_hook_init(ops, family, hook, chain);
}
}
nft_basechain_hook_init(&basechain->ops, family, hook, chain);
chain->flags |= NFT_CHAIN_BASE | flags;
basechain->policy = NF_ACCEPT;
if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
!nft_chain_offload_support(basechain)) {
list_splice_init(&basechain->hook_list, &hook->list);
return -EOPNOTSUPP;
}
flow_block_init(&basechain->flow_block);
return 0;
}
int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
{
int err;
err = rhltable_insert_key(&table->chains_ht, chain->name,
&chain->rhlhead, nft_chain_ht_params);
if (err)
return err;
list_add_tail_rcu(&chain->list, &table->chains);
return 0;
}
static u64 chain_id;
static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 policy,
u32 flags, struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_table *table = ctx->table;
struct nft_base_chain *basechain;
struct net *net = ctx->net;
char name[NFT_NAME_MAXLEN];
struct nft_rule_blob *blob;
struct nft_trans *trans;
struct nft_chain *chain;
int err;
if (nla[NFTA_CHAIN_HOOK]) {
struct nft_stats __percpu *stats = NULL;
struct nft_chain_hook hook = {};
if (table->flags & __NFT_TABLE_F_UPDATE)
return -EINVAL;
if (flags & NFT_CHAIN_BINDING)
return -EOPNOTSUPP;
err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
extack);
if (err < 0)
return err;
basechain = kzalloc_obj(*basechain, GFP_KERNEL_ACCOUNT);
if (basechain == NULL) {
nft_chain_release_hook(&hook);
return -ENOMEM;
}
chain = &basechain->chain;
if (nla[NFTA_CHAIN_COUNTERS]) {
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
if (IS_ERR_PCPU(stats)) {
nft_chain_release_hook(&hook);
kfree(basechain);
return PTR_ERR_PCPU(stats);
}
rcu_assign_pointer(basechain->stats, stats);
}
err = nft_basechain_init(basechain, family, &hook, flags);
if (err < 0) {
nft_chain_release_hook(&hook);
kfree(basechain);
free_percpu(stats);
return err;
}
if (stats)
static_branch_inc(&nft_counters_enabled);
} else {
if (flags & NFT_CHAIN_BASE)
return -EINVAL;
if (flags & NFT_CHAIN_HW_OFFLOAD)
return -EOPNOTSUPP;
chain = kzalloc_obj(*chain, GFP_KERNEL_ACCOUNT);
if (chain == NULL)
return -ENOMEM;
chain->flags = flags;
}
ctx->chain = chain;
INIT_LIST_HEAD(&chain->rules);
chain->handle = nf_tables_alloc_handle(table);
chain->table = table;
if (nla[NFTA_CHAIN_NAME]) {
chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
} else {
if (!(flags & NFT_CHAIN_BINDING)) {
err = -EINVAL;
goto err_destroy_chain;
}
snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
}
if (!chain->name) {
err = -ENOMEM;
goto err_destroy_chain;
}
if (nla[NFTA_CHAIN_USERDATA]) {
chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
if (chain->udata == NULL) {
err = -ENOMEM;
goto err_destroy_chain;
}
chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
}
blob = nf_tables_chain_alloc_rules(chain, 0);
if (!blob) {
err = -ENOMEM;
goto err_destroy_chain;
}
RCU_INIT_POINTER(chain->blob_gen_0, blob);
RCU_INIT_POINTER(chain->blob_gen_1, blob);
if (!nft_use_inc(&table->use)) {
err = -EMFILE;
goto err_destroy_chain;
}
trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto err_trans;
}
nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
if (nft_is_base_chain(chain))
nft_trans_chain_policy(trans) = policy;
err = nft_chain_add(table, chain);
if (err < 0)
goto err_chain_add;
err = nf_tables_register_hook(net, table, chain);
if (err < 0)
goto err_register_hook;
return 0;
err_register_hook:
nft_chain_del(chain);
synchronize_rcu();
err_chain_add:
nft_trans_destroy(trans);
err_trans:
nft_use_dec_restore(&table->use);
err_destroy_chain:
nf_tables_chain_destroy(chain);
return err;
}
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
u32 flags, const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_base_chain *basechain = NULL;
struct nft_table *table = ctx->table;
struct nft_chain *chain = ctx->chain;
struct nft_chain_hook hook = {};
struct nft_stats __percpu *stats = NULL;
struct nftables_pernet *nft_net;
struct nft_hook *h, *next;
struct nf_hook_ops *ops;
struct nft_trans *trans;
bool unregister = false;
int err;
if (chain->flags ^ flags)
return -EOPNOTSUPP;
INIT_LIST_HEAD(&hook.list);
if (nla[NFTA_CHAIN_HOOK]) {
if (!nft_is_base_chain(chain)) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
basechain = nft_base_chain(chain);
err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
ctx->family, flags, extack);
if (err < 0)
return err;
if (basechain->type != hook.type) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
list_for_each_entry_safe(h, next, &hook.list, list) {
list_for_each_entry(ops, &h->ops_list, list) {
ops->pf = basechain->ops.pf;
ops->hooknum = basechain->ops.hooknum;
ops->priority = basechain->ops.priority;
ops->priv = basechain->ops.priv;
ops->hook = basechain->ops.hook;
}
if (nft_hook_list_find(&basechain->hook_list, h)) {
list_del(&h->list);
nft_netdev_hook_free(h);
continue;
}
nft_net = nft_pernet(ctx->net);
list_for_each_entry(trans, &nft_net->commit_list, list) {
if (trans->msg_type != NFT_MSG_NEWCHAIN ||
trans->table != ctx->table ||
!nft_trans_chain_update(trans))
continue;
if (nft_hook_list_find(&nft_trans_chain_hooks(trans), h)) {
nft_chain_release_hook(&hook);
return -EEXIST;
}
}
}
} else {
ops = &basechain->ops;
if (ops->hooknum != hook.num ||
ops->priority != hook.priority) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
}
}
if (nla[NFTA_CHAIN_HANDLE] &&
nla[NFTA_CHAIN_NAME]) {
struct nft_chain *chain2;
chain2 = nft_chain_lookup(ctx->net, table,
nla[NFTA_CHAIN_NAME], genmask);
if (!IS_ERR(chain2)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
err = -EEXIST;
goto err_hooks;
}
}
if (table->flags & __NFT_TABLE_F_UPDATE &&
!list_empty(&hook.list)) {
NL_SET_BAD_ATTR(extack, attr);
err = -EOPNOTSUPP;
goto err_hooks;
}
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
nft_is_base_chain(chain) &&
!list_empty(&hook.list)) {
basechain = nft_base_chain(chain);
ops = &basechain->ops;
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
err = nft_netdev_register_hooks(ctx->net, &hook.list);
if (err < 0)
goto err_hooks;
unregister = true;
}
}
if (nla[NFTA_CHAIN_COUNTERS]) {
if (!nft_is_base_chain(chain)) {
err = -EOPNOTSUPP;
goto err_hooks;
}
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
if (IS_ERR_PCPU(stats)) {
err = PTR_ERR_PCPU(stats);
goto err_hooks;
}
}
err = -ENOMEM;
trans = nft_trans_alloc_chain(ctx, NFT_MSG_NEWCHAIN);
if (trans == NULL)
goto err_trans;
nft_trans_chain_stats(trans) = stats;
nft_trans_chain_update(trans) = true;
if (nla[NFTA_CHAIN_POLICY])
nft_trans_chain_policy(trans) = policy;
else
nft_trans_chain_policy(trans) = -1;
if (nla[NFTA_CHAIN_HANDLE] &&
nla[NFTA_CHAIN_NAME]) {
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
struct nft_trans *tmp;
char *name;
err = -ENOMEM;
name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
if (!name)
goto err_trans;
err = -EEXIST;
list_for_each_entry(tmp, &nft_net->commit_list, list) {
if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
tmp->table == table &&
nft_trans_chain_update(tmp) &&
nft_trans_chain_name(tmp) &&
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
kfree(name);
goto err_trans;
}
}
nft_trans_chain_name(trans) = name;
}
nft_trans_basechain(trans) = basechain;
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
list_splice(&hook.list, &nft_trans_chain_hooks(trans));
if (nla[NFTA_CHAIN_HOOK])
module_put(hook.type->owner);
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_trans:
free_percpu(stats);
kfree(trans);
err_hooks:
if (nla[NFTA_CHAIN_HOOK]) {
list_for_each_entry_safe(h, next, &hook.list, list) {
if (unregister) {
list_for_each_entry(ops, &h->ops_list, list)
nf_unregister_net_hook(ctx->net, ops);
}
list_del(&h->list);
nft_netdev_hook_free_rcu(h);
}
module_put(hook.type->owner);
}
return err;
}
static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
struct nftables_pernet *nft_net = nft_pernet(net);
u32 id = ntohl(nla_get_be32(nla));
struct nft_trans *trans;
list_for_each_entry(trans, &nft_net->commit_list, list) {
if (trans->msg_type == NFT_MSG_NEWCHAIN &&
nft_trans_chain(trans)->table == table &&
id == nft_trans_chain_id(trans) &&
nft_active_genmask(nft_trans_chain(trans), genmask))
return nft_trans_chain(trans);
}
return ERR_PTR(-ENOENT);
}
static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct nftables_pernet *nft_net = nft_pernet(info->net);
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_chain *chain = NULL;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
u8 policy = NF_ACCEPT;
struct nft_ctx ctx;
u64 handle = 0;
u32 flags = 0;
lockdep_assert_held(&nft_net->commit_mutex);
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
}
chain = NULL;
attr = nla[NFTA_CHAIN_NAME];
if (nla[NFTA_CHAIN_HANDLE]) {
handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
chain = nft_chain_lookup_byhandle(table, handle, genmask);
if (IS_ERR(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
return PTR_ERR(chain);
}
attr = nla[NFTA_CHAIN_HANDLE];
} else if (nla[NFTA_CHAIN_NAME]) {
chain = nft_chain_lookup(net, table, attr, genmask);
if (IS_ERR(chain)) {
if (PTR_ERR(chain) != -ENOENT) {
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(chain);
}
chain = NULL;
}
} else if (!nla[NFTA_CHAIN_ID]) {
return -EINVAL;
}
if (nla[NFTA_CHAIN_POLICY]) {
if (chain != NULL &&
!nft_is_base_chain(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
return -EOPNOTSUPP;
}
if (chain == NULL &&
nla[NFTA_CHAIN_HOOK] == NULL) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
return -EOPNOTSUPP;
}
policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
switch (policy) {
case NF_DROP:
case NF_ACCEPT:
break;
default:
return -EINVAL;
}
}
if (nla[NFTA_CHAIN_FLAGS])
flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
else if (chain)
flags = chain->flags;
if (flags & ~NFT_CHAIN_FLAGS)
return -EOPNOTSUPP;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (chain != NULL) {
if (chain->flags & NFT_CHAIN_BINDING)
return -EINVAL;
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
flags |= chain->flags & NFT_CHAIN_BASE;
return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
extack);
}
return nf_tables_addchain(&ctx, family, policy, flags, extack);
}
static int nft_delchain_hook(struct nft_ctx *ctx,
struct nft_base_chain *basechain,
struct netlink_ext_ack *extack)
{
const struct nft_chain *chain = &basechain->chain;
const struct nlattr * const *nla = ctx->nla;
struct nft_chain_hook chain_hook = {};
struct nft_hook *this, *hook;
LIST_HEAD(chain_del_list);
struct nft_trans *trans;
int err;
if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
return -EOPNOTSUPP;
err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
ctx->family, chain->flags, extack);
if (err < 0)
return err;
list_for_each_entry(this, &chain_hook.list, list) {
hook = nft_hook_list_find(&basechain->hook_list, this);
if (!hook) {
err = -ENOENT;
goto err_chain_del_hook;
}
list_move(&hook->list, &chain_del_list);
}
trans = nft_trans_alloc_chain(ctx, NFT_MSG_DELCHAIN);
if (!trans) {
err = -ENOMEM;
goto err_chain_del_hook;
}
nft_trans_basechain(trans) = basechain;
nft_trans_chain_update(trans) = true;
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
nft_chain_release_hook(&chain_hook);
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_chain_del_hook:
list_splice(&chain_del_list, &basechain->hook_list);
nft_chain_release_hook(&chain_hook);
return err;
}
static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_chain *chain;
struct nft_rule *rule;
struct nft_ctx ctx;
u64 handle;
u32 use;
int err;
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
}
if (nla[NFTA_CHAIN_HANDLE]) {
attr = nla[NFTA_CHAIN_HANDLE];
handle = be64_to_cpu(nla_get_be64(attr));
chain = nft_chain_lookup_byhandle(table, handle, genmask);
} else {
attr = nla[NFTA_CHAIN_NAME];
chain = nft_chain_lookup(net, table, attr, genmask);
}
if (IS_ERR(chain)) {
if (PTR_ERR(chain) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
return 0;
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(chain);
}
if (nft_chain_binding(chain))
return -EOPNOTSUPP;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (nla[NFTA_CHAIN_HOOK]) {
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
chain->flags & NFT_CHAIN_HW_OFFLOAD)
return -EOPNOTSUPP;
if (nft_is_base_chain(chain)) {
struct nft_base_chain *basechain = nft_base_chain(chain);
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
return nft_delchain_hook(&ctx, basechain, extack);
}
}
if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
chain->use > 0)
return -EBUSY;
use = chain->use;
list_for_each_entry(rule, &chain->rules, list) {
if (!nft_is_active_next(net, rule))
continue;
use--;
err = nft_delrule(&ctx, rule);
if (err < 0)
return err;
}
if (use > 0) {
NL_SET_BAD_ATTR(extack, attr);
return -EBUSY;
}
return nft_delchain(&ctx);
}
int nft_register_expr(struct nft_expr_type *type)
{
if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
return -ENOMEM;
nfnl_lock(NFNL_SUBSYS_NFTABLES);
if (type->family == NFPROTO_UNSPEC)
list_add_tail_rcu(&type->list, &nf_tables_expressions);
else
list_add_rcu(&type->list, &nf_tables_expressions);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
return 0;
}
EXPORT_SYMBOL_GPL(nft_register_expr);
void nft_unregister_expr(struct nft_expr_type *type)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_del_rcu(&type->list);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_expr);
static const struct nft_expr_type *__nft_expr_type_get(u8 family,
struct nlattr *nla)
{
const struct nft_expr_type *type, *candidate = NULL;
list_for_each_entry_rcu(type, &nf_tables_expressions, list) {
if (!nla_strcmp(nla, type->name)) {
if (!type->family && !candidate)
candidate = type;
else if (type->family == family)
candidate = type;
}
}
return candidate;
}
#ifdef CONFIG_MODULES
static int nft_expr_type_request_module(struct net *net, u8 family,
struct nlattr *nla)
{
if (nft_request_module(net, "nft-expr-%u-%.*s", family,
nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
return -EAGAIN;
return 0;
}
#endif
static const struct nft_expr_type *nft_expr_type_get(struct net *net,
u8 family,
struct nlattr *nla)
{
const struct nft_expr_type *type;
if (nla == NULL)
return ERR_PTR(-EINVAL);
rcu_read_lock();
type = __nft_expr_type_get(family, nla);
if (type != NULL && try_module_get(type->owner)) {
rcu_read_unlock();
return type;
}
rcu_read_unlock();
lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
if (type == NULL) {
if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
return ERR_PTR(-EAGAIN);
if (nft_request_module(net, "nft-expr-%.*s",
nla_len(nla),
(char *)nla_data(nla)) == -EAGAIN)
return ERR_PTR(-EAGAIN);
}
#endif
return ERR_PTR(-ENOENT);
}
static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
[NFTA_EXPR_NAME] = { .type = NLA_STRING,
.len = NFT_MODULE_AUTOLOAD_LIMIT },
[NFTA_EXPR_DATA] = { .type = NLA_NESTED },
};
static int nf_tables_fill_expr_info(struct sk_buff *skb,
const struct nft_expr *expr, bool reset)
{
if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
goto nla_put_failure;
if (expr->ops->dump) {
struct nlattr *data = nla_nest_start_noflag(skb,
NFTA_EXPR_DATA);
if (data == NULL)
goto nla_put_failure;
if (expr->ops->dump(skb, expr, reset) < 0)
goto nla_put_failure;
nla_nest_end(skb, data);
}
return skb->len;
nla_put_failure:
return -1;
};
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
const struct nft_expr *expr, bool reset)
{
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, attr);
if (!nest)
goto nla_put_failure;
if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
return -1;
}
struct nft_expr_info {
const struct nft_expr_ops *ops;
const struct nlattr *attr;
struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
};
static int nf_tables_expr_parse(const struct nft_ctx *ctx,
const struct nlattr *nla,
struct nft_expr_info *info)
{
const struct nft_expr_type *type;
const struct nft_expr_ops *ops;
struct nlattr *tb[NFTA_EXPR_MAX + 1];
int err;
err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
nft_expr_policy, NULL);
if (err < 0)
return err;
type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
if (IS_ERR(type))
return PTR_ERR(type);
if (tb[NFTA_EXPR_DATA]) {
err = nla_parse_nested_deprecated(info->tb, type->maxattr,
tb[NFTA_EXPR_DATA],
type->policy, NULL);
if (err < 0)
goto err1;
} else
memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
if (type->select_ops != NULL) {
ops = type->select_ops(ctx,
(const struct nlattr * const *)info->tb);
if (IS_ERR(ops)) {
err = PTR_ERR(ops);
#ifdef CONFIG_MODULES
if (err == -EAGAIN)
if (nft_expr_type_request_module(ctx->net,
ctx->family,
tb[NFTA_EXPR_NAME]) != -EAGAIN)
err = -ENOENT;
#endif
goto err1;
}
} else
ops = type->ops;
info->attr = nla;
info->ops = ops;
return 0;
err1:
module_put(type->owner);
return err;
}
int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
struct nft_expr_info *info)
{
struct nlattr *tb[NFTA_EXPR_MAX + 1];
const struct nft_expr_type *type;
int err;
err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
nft_expr_policy, NULL);
if (err < 0)
return err;
if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
return -EINVAL;
rcu_read_lock();
type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
if (!type) {
err = -ENOENT;
goto out_unlock;
}
if (!type->inner_ops) {
err = -EOPNOTSUPP;
goto out_unlock;
}
err = nla_parse_nested_deprecated(info->tb, type->maxattr,
tb[NFTA_EXPR_DATA],
type->policy, NULL);
if (err < 0)
goto out_unlock;
info->attr = nla;
info->ops = type->inner_ops;
rcu_read_unlock();
return 0;
out_unlock:
rcu_read_unlock();
return err;
}
static int nf_tables_newexpr(const struct nft_ctx *ctx,
const struct nft_expr_info *expr_info,
struct nft_expr *expr)
{
const struct nft_expr_ops *ops = expr_info->ops;
int err;
expr->ops = ops;
if (ops->init) {
err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
if (err < 0)
goto err1;
}
return 0;
err1:
expr->ops = NULL;
return err;
}
static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
struct nft_expr *expr)
{
const struct nft_expr_type *type = expr->ops->type;
if (expr->ops->destroy)
expr->ops->destroy(ctx, expr);
module_put(type->owner);
}
static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
const struct nlattr *nla)
{
struct nft_expr_info expr_info;
struct nft_expr *expr;
struct module *owner;
int err;
err = nf_tables_expr_parse(ctx, nla, &expr_info);
if (err < 0)
goto err_expr_parse;
err = -EOPNOTSUPP;
if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
goto err_expr_stateful;
err = -ENOMEM;
expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
if (expr == NULL)
goto err_expr_stateful;
err = nf_tables_newexpr(ctx, &expr_info, expr);
if (err < 0)
goto err_expr_new;
return expr;
err_expr_new:
kfree(expr);
err_expr_stateful:
owner = expr_info.ops->type->owner;
if (expr_info.ops->type->release_ops)
expr_info.ops->type->release_ops(expr_info.ops);
module_put(owner);
err_expr_parse:
return ERR_PTR(err);
}
int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp)
{
int err;
if (WARN_ON_ONCE(!src->ops->clone))
return -EINVAL;
dst->ops = src->ops;
err = src->ops->clone(dst, src, gfp);
if (err < 0)
return err;
__module_get(src->ops->type->owner);
return 0;
}
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
{
nf_tables_expr_destroy(ctx, expr);
kfree(expr);
}
static struct nft_rule *__nft_rule_lookup(const struct net *net,
const struct nft_chain *chain,
u64 handle)
{
struct nft_rule *rule;
list_for_each_entry_rcu(rule, &chain->rules, list,
lockdep_commit_lock_is_held(net)) {
if (handle == rule->handle)
return rule;
}
return ERR_PTR(-ENOENT);
}
static struct nft_rule *nft_rule_lookup(const struct net *net,
const struct nft_chain *chain,
const struct nlattr *nla)
{
if (nla == NULL)
return ERR_PTR(-EINVAL);
return __nft_rule_lookup(net, chain, be64_to_cpu(nla_get_be64(nla)));
}
static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
[NFTA_RULE_TABLE] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_RULE_CHAIN] = { .type = NLA_STRING,
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_RULE_HANDLE] = { .type = NLA_U64 },
[NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
[NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
[NFTA_RULE_POSITION] = { .type = NLA_U64 },
[NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
[NFTA_RULE_ID] = { .type = NLA_U32 },
[NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
[NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
};
static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event,
u32 flags, int family,
const struct nft_table *table,
const struct nft_chain *chain,
const struct nft_rule *rule, u64 handle,
bool reset)
{
struct nlmsghdr *nlh;
const struct nft_expr *expr, *next;
struct nlattr *list;
u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
goto nla_put_failure;
if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
goto nla_put_failure;
if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
NFTA_RULE_PAD))
goto nla_put_failure;
if (event != NFT_MSG_DELRULE && handle) {
if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
NFTA_RULE_PAD))
goto nla_put_failure;
}
if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
nft_flow_rule_stats(chain, rule);
list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
if (list == NULL)
goto nla_put_failure;
nft_rule_for_each_expr(expr, next, rule) {
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, list);
if (rule->udata) {
struct nft_userdata *udata = nft_userdata(rule);
if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
udata->data) < 0)
goto nla_put_failure;
}
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
static void nf_tables_rule_notify(const struct nft_ctx *ctx,
const struct nft_rule *rule, int event)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
const struct nft_rule *prule;
struct sk_buff *skb;
u64 handle = 0;
u16 flags = 0;
int err;
if (!ctx->report &&
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
goto err;
if (event == NFT_MSG_NEWRULE &&
!list_is_first(&rule->list, &ctx->chain->rules) &&
!list_is_last(&rule->list, &ctx->chain->rules)) {
prule = list_prev_entry(rule, list);
handle = prule->handle;
}
if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
flags |= NLM_F_APPEND;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
event, flags, ctx->family, ctx->table,
ctx->chain, rule, handle, false);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static void audit_log_rule_reset(const struct nft_table *table,
unsigned int base_seq,
unsigned int nentries)
{
char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
table->name, base_seq);
audit_log_nfcfg(buf, table->family, nentries,
AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
kfree(buf);
}
struct nft_rule_dump_ctx {
unsigned int s_idx;
char *table;
char *chain;
bool reset;
};
static int __nf_tables_dump_rules(struct sk_buff *skb,
unsigned int *idx,
struct netlink_callback *cb,
const struct nft_table *table,
const struct nft_chain *chain)
{
struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
struct net *net = sock_net(skb->sk);
const struct nft_rule *rule, *prule;
unsigned int entries = 0;
int ret = 0;
u64 handle;
prule = NULL;
list_for_each_entry_rcu(rule, &chain->rules, list) {
if (!nft_is_active(net, rule))
goto cont_skip;
if (*idx < ctx->s_idx)
goto cont;
if (prule)
handle = prule->handle;
else
handle = 0;
if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWRULE,
NLM_F_MULTI | NLM_F_APPEND,
table->family,
table, chain, rule, handle, ctx->reset) < 0) {
ret = 1;
break;
}
entries++;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
prule = rule;
cont_skip:
(*idx)++;
}
if (ctx->reset && entries)
audit_log_rule_reset(table, cb->seq, entries);
return ret;
}
static int nf_tables_dump_rules(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
struct nft_table *table;
const struct nft_chain *chain;
unsigned int idx = 0;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct nftables_pernet *nft_net;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (family != NFPROTO_UNSPEC && family != table->family)
continue;
if (ctx->table && strcmp(ctx->table, table->name) != 0)
continue;
if (ctx->table && ctx->chain) {
struct rhlist_head *list, *tmp;
list = rhltable_lookup(&table->chains_ht, ctx->chain,
nft_chain_ht_params);
if (!list)
goto done;
rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
if (!nft_is_active(net, chain))
continue;
__nf_tables_dump_rules(skb, &idx,
cb, table, chain);
break;
}
goto done;
}
list_for_each_entry_rcu(chain, &table->chains, list) {
if (__nf_tables_dump_rules(skb, &idx,
cb, table, chain))
goto done;
}
if (ctx->table)
break;
}
done:
rcu_read_unlock();
ctx->s_idx = idx;
return skb->len;
}
static int nf_tables_dump_rules_start(struct netlink_callback *cb)
{
struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
const struct nlattr * const *nla = cb->data;
BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
if (nla[NFTA_RULE_TABLE]) {
ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
if (!ctx->table)
return -ENOMEM;
}
if (nla[NFTA_RULE_CHAIN]) {
ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
if (!ctx->chain) {
kfree(ctx->table);
return -ENOMEM;
}
}
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
ctx->reset = true;
return 0;
}
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
{
struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
kfree(ctx->table);
kfree(ctx->chain);
return 0;
}
static struct sk_buff *
nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
const struct nlattr * const nla[], bool reset)
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_chain *chain;
const struct nft_rule *rule;
struct net *net = info->net;
struct nft_table *table;
struct sk_buff *skb2;
int err;
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return ERR_CAST(table);
}
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
if (IS_ERR(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
return ERR_CAST(chain);
}
rule = nft_rule_lookup(net, chain, nla[NFTA_RULE_HANDLE]);
if (IS_ERR(rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
return ERR_CAST(rule);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return ERR_PTR(-ENOMEM);
err = nf_tables_fill_rule_info(skb2, net, portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
family, table, chain, rule, 0, reset);
if (err < 0) {
kfree_skb(skb2);
return ERR_PTR(err);
}
return skb2;
}
static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
u32 portid = NETLINK_CB(skb).portid;
struct net *net = info->net;
struct sk_buff *skb2;
bool reset = false;
char *buf;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start= nf_tables_dump_rules_start,
.dump = nf_tables_dump_rules,
.done = nf_tables_dump_rules_done,
.module = THIS_MODULE,
.data = (void *)nla,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
reset = true;
skb2 = nf_tables_getrule_single(portid, info, nla, reset);
if (IS_ERR(skb2))
return PTR_ERR(skb2);
if (!reset)
return nfnetlink_unicast(skb2, net, portid);
buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
nla_len(nla[NFTA_RULE_TABLE]),
(char *)nla_data(nla[NFTA_RULE_TABLE]),
nft_base_seq(net));
audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
kfree(buf);
return nfnetlink_unicast(skb2, net, portid);
}
void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
{
struct nft_expr *expr, *next;
expr = nft_expr_first(rule);
while (nft_expr_more(rule, expr)) {
next = nft_expr_next(expr);
nf_tables_expr_destroy(ctx, expr);
expr = next;
}
kfree(rule);
}
static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
{
WARN_ON_ONCE(!lockdep_commit_lock_is_held(ctx->net));
nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
nf_tables_rule_destroy(ctx, rule);
}
static void nft_chain_vstate_update(const struct nft_ctx *ctx, struct nft_chain *chain)
{
const struct nft_base_chain *base_chain;
enum nft_chain_types type;
u8 hooknum;
if (WARN_ON_ONCE(!nft_is_base_chain(ctx->chain))) {
memset(&chain->vstate, 0, sizeof(chain->vstate));
return;
}
base_chain = nft_base_chain(ctx->chain);
hooknum = base_chain->ops.hooknum;
type = base_chain->type->type;
BUILD_BUG_ON(BIT(NF_INET_NUMHOOKS) > U8_MAX);
chain->vstate.hook_mask[type] |= BIT(hooknum);
if (chain->vstate.depth < ctx->level)
chain->vstate.depth = ctx->level;
}
int nft_chain_validate(const struct nft_ctx *ctx, struct nft_chain *chain)
{
struct nft_expr *expr, *last;
struct nft_rule *rule;
int err;
BUILD_BUG_ON(NFT_JUMP_STACK_SIZE > 255);
if (ctx->level == NFT_JUMP_STACK_SIZE)
return -EMLINK;
if (ctx->level > 0) {
if (nft_is_base_chain(chain))
return -ELOOP;
if (nft_chain_vstate_valid(ctx, chain))
return 0;
}
list_for_each_entry(rule, &chain->rules, list) {
if (fatal_signal_pending(current))
return -EINTR;
if (!nft_is_active_next(ctx->net, rule))
continue;
nft_rule_for_each_expr(expr, last, rule) {
if (!expr->ops->validate)
continue;
err = expr->ops->validate(ctx, expr);
if (err < 0)
return err;
}
cond_resched();
}
nft_chain_vstate_update(ctx, chain);
return 0;
}
EXPORT_SYMBOL_GPL(nft_chain_validate);
static int nft_table_validate(struct net *net, const struct nft_table *table)
{
struct nft_chain *chain;
struct nft_ctx ctx = {
.net = net,
.family = table->family,
};
int err = 0;
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_base_chain(chain))
continue;
ctx.chain = chain;
err = nft_chain_validate(&ctx, chain);
if (err < 0)
goto err;
}
err:
list_for_each_entry(chain, &table->chains, list)
memset(&chain->vstate, 0, sizeof(chain->vstate));
return err;
}
int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
struct nft_ctx *pctx = (struct nft_ctx *)ctx;
const struct nft_data *data;
int err;
if (!nft_set_elem_active(ext, iter->genmask))
return 0;
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
*nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
return 0;
data = nft_set_ext_data(ext);
switch (data->verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
pctx->level++;
err = nft_chain_validate(ctx, data->verdict.chain);
if (err < 0)
return err;
pctx->level--;
break;
default:
break;
}
return 0;
}
int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
{
struct nft_set_iter dummy_iter = {
.genmask = nft_genmask_next(ctx->net),
};
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
int ret = 0;
list_for_each_entry_rcu(catchall, &set->catchall_list, list,
lockdep_commit_lock_is_held(ctx->net)) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, dummy_iter.genmask))
continue;
ret = nft_setelem_validate(ctx, set, &dummy_iter, catchall->elem);
if (ret < 0)
return ret;
}
return ret;
}
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
const struct nft_chain *chain,
const struct nlattr *nla);
#define NFT_RULE_MAXEXPRS 128
static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct nftables_pernet *nft_net = nft_pernet(info->net);
struct netlink_ext_ack *extack = info->extack;
unsigned int size, i, n, ulen = 0, usize = 0;
u8 genmask = nft_genmask_next(info->net);
struct nft_rule *rule, *old_rule = NULL;
struct nft_expr_info *expr_info = NULL;
u8 family = info->nfmsg->nfgen_family;
struct nft_flow_rule *flow = NULL;
struct net *net = info->net;
struct nft_userdata *udata;
struct nft_table *table;
struct nft_chain *chain;
struct nft_trans *trans;
u64 handle, pos_handle;
struct nft_expr *expr;
struct nft_ctx ctx;
struct nlattr *tmp;
int err, rem;
lockdep_assert_held(&nft_net->commit_mutex);
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return PTR_ERR(table);
}
if (nla[NFTA_RULE_CHAIN]) {
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
genmask);
if (IS_ERR(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
return PTR_ERR(chain);
}
} else if (nla[NFTA_RULE_CHAIN_ID]) {
chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
genmask);
if (IS_ERR(chain)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
return PTR_ERR(chain);
}
} else {
return -EINVAL;
}
if (nft_chain_is_bound(chain))
return -EOPNOTSUPP;
if (nla[NFTA_RULE_HANDLE]) {
handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
rule = __nft_rule_lookup(net, chain, handle);
if (IS_ERR(rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
return PTR_ERR(rule);
}
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
return -EEXIST;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
old_rule = rule;
else
return -EOPNOTSUPP;
} else {
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EINVAL;
handle = nf_tables_alloc_handle(table);
if (nla[NFTA_RULE_POSITION]) {
pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
old_rule = __nft_rule_lookup(net, chain, pos_handle);
if (IS_ERR(old_rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
return PTR_ERR(old_rule);
}
} else if (nla[NFTA_RULE_POSITION_ID]) {
old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
if (IS_ERR(old_rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
return PTR_ERR(old_rule);
}
}
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
n = 0;
size = 0;
if (nla[NFTA_RULE_EXPRESSIONS]) {
expr_info = kvmalloc_objs(struct nft_expr_info,
NFT_RULE_MAXEXPRS);
if (!expr_info)
return -ENOMEM;
nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
err = -EINVAL;
if (nla_type(tmp) != NFTA_LIST_ELEM)
goto err_release_expr;
if (n == NFT_RULE_MAXEXPRS)
goto err_release_expr;
err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
if (err < 0) {
NL_SET_BAD_ATTR(extack, tmp);
goto err_release_expr;
}
size += expr_info[n].ops->size;
n++;
}
}
err = -EFBIG;
if (size >= 1 << 12)
goto err_release_expr;
if (nla[NFTA_RULE_USERDATA]) {
ulen = nla_len(nla[NFTA_RULE_USERDATA]);
if (ulen > 0)
usize = sizeof(struct nft_userdata) + ulen;
}
err = -ENOMEM;
rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
if (rule == NULL)
goto err_release_expr;
nft_activate_next(net, rule);
rule->handle = handle;
rule->dlen = size;
rule->udata = ulen ? 1 : 0;
if (ulen) {
udata = nft_userdata(rule);
udata->len = ulen - 1;
nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
}
expr = nft_expr_first(rule);
for (i = 0; i < n; i++) {
err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
if (err < 0) {
NL_SET_BAD_ATTR(extack, expr_info[i].attr);
goto err_release_rule;
}
if (expr_info[i].ops->validate)
nft_validate_state_update(table, NFT_VALIDATE_NEED);
expr_info[i].ops = NULL;
expr = nft_expr_next(expr);
}
if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
flow = nft_flow_rule_create(net, rule);
if (IS_ERR(flow)) {
err = PTR_ERR(flow);
goto err_release_rule;
}
}
if (!nft_use_inc(&chain->use)) {
err = -EMFILE;
goto err_destroy_flow;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
if (nft_chain_binding(chain)) {
err = -EOPNOTSUPP;
goto err_destroy_flow_rule;
}
err = nft_delrule(&ctx, old_rule);
if (err < 0)
goto err_destroy_flow_rule;
trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
if (trans == NULL) {
err = -ENOMEM;
goto err_destroy_flow_rule;
}
list_add_tail_rcu(&rule->list, &old_rule->list);
} else {
trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
if (!trans) {
err = -ENOMEM;
goto err_destroy_flow_rule;
}
if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
if (old_rule)
list_add_rcu(&rule->list, &old_rule->list);
else
list_add_tail_rcu(&rule->list, &chain->rules);
} else {
if (old_rule)
list_add_tail_rcu(&rule->list, &old_rule->list);
else
list_add_rcu(&rule->list, &chain->rules);
}
}
kvfree(expr_info);
if (flow)
nft_trans_flow_rule(trans) = flow;
if (table->validate_state == NFT_VALIDATE_DO)
return nft_table_validate(net, table);
return 0;
err_destroy_flow_rule:
nft_use_dec_restore(&chain->use);
err_destroy_flow:
if (flow)
nft_flow_rule_destroy(flow);
err_release_rule:
nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
nf_tables_rule_destroy(&ctx, rule);
err_release_expr:
for (i = 0; i < n; i++) {
if (expr_info[i].ops) {
module_put(expr_info[i].ops->type->owner);
if (expr_info[i].ops->type->release_ops)
expr_info[i].ops->type->release_ops(expr_info[i].ops);
}
}
kvfree(expr_info);
return err;
}
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
const struct nft_chain *chain,
const struct nlattr *nla)
{
struct nftables_pernet *nft_net = nft_pernet(net);
u32 id = ntohl(nla_get_be32(nla));
struct nft_trans *trans;
list_for_each_entry(trans, &nft_net->commit_list, list) {
if (trans->msg_type == NFT_MSG_NEWRULE &&
nft_trans_rule_chain(trans) == chain &&
id == nft_trans_rule_id(trans))
return nft_trans_rule(trans);
}
return ERR_PTR(-ENOENT);
}
static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_chain *chain = NULL;
struct net *net = info->net;
struct nft_table *table;
struct nft_rule *rule;
struct nft_ctx ctx;
int err = 0;
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return PTR_ERR(table);
}
if (nla[NFTA_RULE_CHAIN]) {
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
genmask);
if (IS_ERR(chain)) {
if (PTR_ERR(chain) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
return 0;
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
return PTR_ERR(chain);
}
if (nft_chain_binding(chain))
return -EOPNOTSUPP;
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (chain) {
if (nla[NFTA_RULE_HANDLE]) {
rule = nft_rule_lookup(info->net, chain, nla[NFTA_RULE_HANDLE]);
if (IS_ERR(rule)) {
if (PTR_ERR(rule) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
return 0;
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
return PTR_ERR(rule);
}
err = nft_delrule(&ctx, rule);
} else if (nla[NFTA_RULE_ID]) {
rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
if (IS_ERR(rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
return PTR_ERR(rule);
}
err = nft_delrule(&ctx, rule);
} else {
err = nft_delrule_by_chain(&ctx);
}
} else {
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (nft_chain_binding(chain))
continue;
ctx.chain = chain;
err = nft_delrule_by_chain(&ctx);
if (err < 0)
break;
}
}
return err;
}
static const struct nft_set_type *nft_set_types[] = {
&nft_set_hash_fast_type,
&nft_set_hash_type,
&nft_set_rhash_type,
&nft_set_bitmap_type,
&nft_set_rbtree_type,
#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
&nft_set_pipapo_avx2_type,
#endif
&nft_set_pipapo_type,
};
#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
NFT_SET_EVAL)
static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
{
return (flags & type->features) == (flags & NFT_SET_FEATURES);
}
static const struct nft_set_ops *
nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
const struct nft_set_desc *desc)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
const struct nft_set_ops *ops, *bops;
struct nft_set_estimate est, best;
const struct nft_set_type *type;
int i;
lockdep_assert_held(&nft_net->commit_mutex);
lockdep_nfnl_nft_mutex_not_held();
bops = NULL;
best.size = ~0;
best.lookup = ~0;
best.space = ~0;
for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
type = nft_set_types[i];
ops = &type->ops;
if (!nft_set_ops_candidate(type, flags))
continue;
if (!ops->estimate(desc, flags, &est))
continue;
switch (desc->policy) {
case NFT_SET_POL_PERFORMANCE:
if (est.lookup < best.lookup)
break;
if (est.lookup == best.lookup &&
est.space < best.space)
break;
continue;
case NFT_SET_POL_MEMORY:
if (!desc->size) {
if (est.space < best.space)
break;
if (est.space == best.space &&
est.lookup < best.lookup)
break;
} else if (est.size < best.size || !bops) {
break;
}
continue;
default:
break;
}
bops = ops;
best = est;
}
if (bops != NULL)
return bops;
return ERR_PTR(-EOPNOTSUPP);
}
static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
[NFTA_SET_TABLE] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_SET_NAME] = { .type = NLA_STRING,
.len = NFT_SET_MAXNAMELEN - 1 },
[NFTA_SET_FLAGS] = { .type = NLA_U32 },
[NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
[NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
[NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
[NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
[NFTA_SET_POLICY] = { .type = NLA_U32 },
[NFTA_SET_DESC] = { .type = NLA_NESTED },
[NFTA_SET_ID] = { .type = NLA_U32 },
[NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
[NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
[NFTA_SET_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
[NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
[NFTA_SET_HANDLE] = { .type = NLA_U64 },
[NFTA_SET_EXPR] = { .type = NLA_NESTED },
[NFTA_SET_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
[NFTA_SET_TYPE] = { .type = NLA_REJECT },
[NFTA_SET_COUNT] = { .type = NLA_REJECT },
};
static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
[NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
};
static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
[NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
[NFTA_SET_DESC_CONCAT] = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
};
static struct nft_set *nft_set_lookup(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
struct nft_set *set;
if (nla == NULL)
return ERR_PTR(-EINVAL);
list_for_each_entry_rcu(set, &table->sets, list,
lockdep_commit_lock_is_held(net)) {
if (!nla_strcmp(nla, set->name) &&
nft_active_genmask(set, genmask))
return set;
}
return ERR_PTR(-ENOENT);
}
static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
const struct nlattr *nla,
u8 genmask)
{
struct nft_set *set;
list_for_each_entry(set, &table->sets, list) {
if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
nft_active_genmask(set, genmask))
return set;
}
return ERR_PTR(-ENOENT);
}
static struct nft_set *nft_set_lookup_byid(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
struct nftables_pernet *nft_net = nft_pernet(net);
u32 id = ntohl(nla_get_be32(nla));
struct nft_trans_set *trans;
list_for_each_entry_reverse(trans, &nft_net->commit_set_list, list_trans_newset) {
struct nft_set *set = trans->set;
if (id == trans->set_id &&
set->table == table &&
nft_active_genmask(set, genmask))
return set;
}
return ERR_PTR(-ENOENT);
}
struct nft_set *nft_set_lookup_global(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla_set_name,
const struct nlattr *nla_set_id,
u8 genmask)
{
struct nft_set *set;
set = nft_set_lookup(net, table, nla_set_name, genmask);
if (IS_ERR(set)) {
if (!nla_set_id)
return set;
set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
}
return set;
}
EXPORT_SYMBOL_GPL(nft_set_lookup_global);
static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
const char *name)
{
const struct nft_set *i;
const char *p;
unsigned long *inuse;
unsigned int n = 0, min = 0;
p = strchr(name, '%');
if (p != NULL) {
if (p[1] != 'd' || strchr(p + 2, '%'))
return -EINVAL;
if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
return -EINVAL;
inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
if (inuse == NULL)
return -ENOMEM;
cont:
list_for_each_entry(i, &ctx->table->sets, list) {
int tmp;
if (!nft_is_active_next(ctx->net, i))
continue;
if (!sscanf(i->name, name, &tmp))
continue;
if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
continue;
set_bit(tmp - min, inuse);
}
n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
if (n >= BITS_PER_BYTE * PAGE_SIZE) {
min += BITS_PER_BYTE * PAGE_SIZE;
memset(inuse, 0, PAGE_SIZE);
goto cont;
}
free_page((unsigned long)inuse);
}
set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
if (!set->name)
return -ENOMEM;
list_for_each_entry(i, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, i))
continue;
if (!strcmp(set->name, i->name)) {
kfree(set->name);
set->name = NULL;
return -ENFILE;
}
}
return 0;
}
int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
{
u64 ms = be64_to_cpu(nla_get_be64(nla));
u64 max = (u64)(~((u64)0));
max = div_u64(max, NSEC_PER_MSEC);
if (ms >= max)
return -ERANGE;
ms *= NSEC_PER_MSEC;
*result = nsecs_to_jiffies64(ms) ? : !!ms;
return 0;
}
__be64 nf_jiffies64_to_msecs(u64 input)
{
return cpu_to_be64(jiffies64_to_msecs(input));
}
static int nf_tables_fill_set_concat(struct sk_buff *skb,
const struct nft_set *set)
{
struct nlattr *concat, *field;
int i;
concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
if (!concat)
return -ENOMEM;
for (i = 0; i < set->field_count; i++) {
field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
if (!field)
return -ENOMEM;
if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
htonl(set->field_len[i])))
return -ENOMEM;
nla_nest_end(skb, field);
}
nla_nest_end(skb, concat);
return 0;
}
static u32 nft_set_userspace_size(const struct nft_set_ops *ops, u32 size)
{
if (ops->usize)
return ops->usize(size);
return size;
}
static noinline_for_stack int
nf_tables_fill_set_info(struct sk_buff *skb, const struct nft_set *set)
{
unsigned int nelems;
char str[40];
int ret;
ret = snprintf(str, sizeof(str), "%ps", set->ops);
DEBUG_NET_WARN_ON_ONCE(ret >= sizeof(str));
if (nla_put_string(skb, NFTA_SET_TYPE, str))
return -EMSGSIZE;
nelems = nft_set_userspace_size(set->ops, atomic_read(&set->nelems));
return nla_put_be32(skb, NFTA_SET_COUNT, htonl(nelems));
}
static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
const struct nft_set *set, u16 event, u16 flags)
{
u64 timeout = READ_ONCE(set->timeout);
u32 gc_int = READ_ONCE(set->gc_int);
u32 portid = ctx->portid;
struct nlmsghdr *nlh;
struct nlattr *nest;
u32 seq = ctx->seq;
int i;
nlh = nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event),
flags, ctx->family, NFNETLINK_V0,
nft_base_seq_be16(ctx->net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
goto nla_put_failure;
if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
NFTA_SET_PAD))
goto nla_put_failure;
if (event == NFT_MSG_DELSET ||
event == NFT_MSG_DESTROYSET) {
nlmsg_end(skb, nlh);
return 0;
}
if (set->flags != 0)
if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
goto nla_put_failure;
if (set->flags & NFT_SET_MAP) {
if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
goto nla_put_failure;
}
if (set->flags & NFT_SET_OBJECT &&
nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
goto nla_put_failure;
if (timeout &&
nla_put_be64(skb, NFTA_SET_TIMEOUT,
nf_jiffies64_to_msecs(timeout),
NFTA_SET_PAD))
goto nla_put_failure;
if (gc_int &&
nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
goto nla_put_failure;
if (set->policy != NFT_SET_POL_PERFORMANCE) {
if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
goto nla_put_failure;
}
if (set->udata &&
nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
if (!nest)
goto nla_put_failure;
if (set->size &&
nla_put_be32(skb, NFTA_SET_DESC_SIZE,
htonl(nft_set_userspace_size(set->ops, set->size))))
goto nla_put_failure;
if (set->field_count > 1 &&
nf_tables_fill_set_concat(skb, set))
goto nla_put_failure;
nla_nest_end(skb, nest);
if (nf_tables_fill_set_info(skb, set))
goto nla_put_failure;
if (set->num_exprs == 1) {
nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
} else if (set->num_exprs > 1) {
nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
if (nest == NULL)
goto nla_put_failure;
for (i = 0; i < set->num_exprs; i++) {
if (nft_expr_dump(skb, NFTA_LIST_ELEM,
set->exprs[i], false) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, nest);
}
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
static void nf_tables_set_notify(const struct nft_ctx *ctx,
const struct nft_set *set, int event,
gfp_t gfp_flags)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
u32 portid = ctx->portid;
struct sk_buff *skb;
u16 flags = 0;
int err;
if (!ctx->report &&
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
if (skb == NULL)
goto err;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_set(skb, ctx, set, event, flags);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nft_set *set;
unsigned int idx, s_idx = cb->args[0];
struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
struct net *net = sock_net(skb->sk);
struct nft_ctx *ctx = cb->data, ctx_set;
struct nftables_pernet *nft_net;
if (cb->args[1])
return skb->len;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (ctx->family != NFPROTO_UNSPEC &&
ctx->family != table->family)
continue;
if (ctx->table && ctx->table != table)
continue;
if (cur_table) {
if (cur_table != table)
continue;
cur_table = NULL;
}
idx = 0;
list_for_each_entry_rcu(set, &table->sets, list) {
if (idx < s_idx)
goto cont;
if (!nft_is_active(net, set))
goto cont;
ctx_set = *ctx;
ctx_set.table = table;
ctx_set.family = table->family;
if (nf_tables_fill_set(skb, &ctx_set, set,
NFT_MSG_NEWSET,
NLM_F_MULTI) < 0) {
cb->args[0] = idx;
cb->args[2] = (unsigned long) table;
goto done;
}
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
if (s_idx)
s_idx = 0;
}
cb->args[1] = 1;
done:
rcu_read_unlock();
return skb->len;
}
static int nf_tables_dump_sets_start(struct netlink_callback *cb)
{
struct nft_ctx *ctx_dump = NULL;
ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
if (ctx_dump == NULL)
return -ENOMEM;
cb->data = ctx_dump;
return 0;
}
static int nf_tables_dump_sets_done(struct netlink_callback *cb)
{
kfree(cb->data);
return 0;
}
static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_table *table = NULL;
struct net *net = info->net;
const struct nft_set *set;
struct sk_buff *skb2;
struct nft_ctx ctx;
int err;
if (nla[NFTA_SET_TABLE]) {
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
return PTR_ERR(table);
}
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = nf_tables_dump_sets_start,
.dump = nf_tables_dump_sets,
.done = nf_tables_dump_sets_done,
.data = &ctx,
.module = THIS_MODULE,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
return -EAFNOSUPPORT;
if (!nla[NFTA_SET_TABLE])
return -EINVAL;
set = nft_set_lookup(net, table, nla[NFTA_SET_NAME], genmask);
if (IS_ERR(set)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
return PTR_ERR(set);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb2 == NULL)
return -ENOMEM;
err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
if (err < 0)
goto err_fill_set_info;
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_set_info:
kfree_skb(skb2);
return err;
}
static int nft_set_desc_concat_parse(const struct nlattr *attr,
struct nft_set_desc *desc)
{
struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
u32 len;
int err;
if (desc->field_count >= ARRAY_SIZE(desc->field_len))
return -E2BIG;
err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
nft_concat_policy, NULL);
if (err < 0)
return err;
if (!tb[NFTA_SET_FIELD_LEN])
return -EINVAL;
len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
if (!len || len > U8_MAX)
return -EINVAL;
desc->field_len[desc->field_count++] = len;
return 0;
}
static int nft_set_desc_concat(struct nft_set_desc *desc,
const struct nlattr *nla)
{
u32 len = 0, num_regs;
struct nlattr *attr;
int rem, err, i;
nla_for_each_nested(attr, nla, rem) {
if (nla_type(attr) != NFTA_LIST_ELEM)
return -EINVAL;
err = nft_set_desc_concat_parse(attr, desc);
if (err < 0)
return err;
}
for (i = 0; i < desc->field_count; i++)
len += round_up(desc->field_len[i], sizeof(u32));
if (len != desc->klen)
return -EINVAL;
num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
if (num_regs > NFT_REG32_COUNT)
return -E2BIG;
return 0;
}
static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
const struct nlattr *nla)
{
struct nlattr *da[NFTA_SET_DESC_MAX + 1];
int err;
err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
nft_set_desc_policy, NULL);
if (err < 0)
return err;
if (da[NFTA_SET_DESC_SIZE] != NULL)
desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
if (da[NFTA_SET_DESC_CONCAT])
err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
return err;
}
static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr * const *nla,
struct nft_expr **exprs, int *num_exprs,
u32 flags)
{
struct nft_expr *expr;
int err, i;
if (nla[NFTA_SET_EXPR]) {
expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
if (IS_ERR(expr)) {
err = PTR_ERR(expr);
goto err_set_expr_alloc;
}
exprs[0] = expr;
(*num_exprs)++;
} else if (nla[NFTA_SET_EXPRESSIONS]) {
struct nlattr *tmp;
int left;
if (!(flags & NFT_SET_EXPR)) {
err = -EINVAL;
goto err_set_expr_alloc;
}
i = 0;
nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
if (i == NFT_SET_EXPR_MAX) {
err = -E2BIG;
goto err_set_expr_alloc;
}
if (nla_type(tmp) != NFTA_LIST_ELEM) {
err = -EINVAL;
goto err_set_expr_alloc;
}
expr = nft_set_elem_expr_alloc(ctx, set, tmp);
if (IS_ERR(expr)) {
err = PTR_ERR(expr);
goto err_set_expr_alloc;
}
exprs[i++] = expr;
(*num_exprs)++;
}
}
return 0;
err_set_expr_alloc:
for (i = 0; i < *num_exprs; i++)
nft_expr_destroy(ctx, exprs[i]);
return err;
}
static bool nft_set_is_same(const struct nft_set *set,
const struct nft_set_desc *desc,
struct nft_expr *exprs[], u32 num_exprs, u32 flags)
{
int i;
if (set->ktype != desc->ktype ||
set->dtype != desc->dtype ||
set->flags != flags ||
set->klen != desc->klen ||
set->dlen != desc->dlen ||
set->field_count != desc->field_count ||
set->num_exprs != num_exprs)
return false;
for (i = 0; i < desc->field_count; i++) {
if (set->field_len[i] != desc->field_len[i])
return false;
}
for (i = 0; i < num_exprs; i++) {
if (set->exprs[i]->ops != exprs[i]->ops)
return false;
}
return true;
}
static u32 nft_set_kernel_size(const struct nft_set_ops *ops,
const struct nft_set_desc *desc)
{
if (ops->ksize)
return ops->ksize(desc->size);
return desc->size;
}
static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_set_ops *ops;
struct net *net = info->net;
struct nft_set_desc desc;
struct nft_table *table;
unsigned char *udata;
struct nft_set *set;
struct nft_ctx ctx;
size_t alloc_size;
int num_exprs = 0;
char *name;
int err, i;
u16 udlen;
u32 flags;
u64 size;
if (nla[NFTA_SET_TABLE] == NULL ||
nla[NFTA_SET_NAME] == NULL ||
nla[NFTA_SET_KEY_LEN] == NULL ||
nla[NFTA_SET_ID] == NULL)
return -EINVAL;
memset(&desc, 0, sizeof(desc));
desc.ktype = NFT_DATA_VALUE;
if (nla[NFTA_SET_KEY_TYPE] != NULL) {
desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
return -EINVAL;
}
desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
return -EINVAL;
flags = 0;
if (nla[NFTA_SET_FLAGS] != NULL) {
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
NFT_SET_MAP | NFT_SET_EVAL |
NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
return -EOPNOTSUPP;
if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
(NFT_SET_MAP | NFT_SET_OBJECT))
return -EOPNOTSUPP;
if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
(NFT_SET_EVAL | NFT_SET_OBJECT))
return -EOPNOTSUPP;
if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
(NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
return -EOPNOTSUPP;
if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
(NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
return -EOPNOTSUPP;
}
desc.dtype = 0;
if (nla[NFTA_SET_DATA_TYPE] != NULL) {
if (!(flags & NFT_SET_MAP))
return -EINVAL;
desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
desc.dtype != NFT_DATA_VERDICT)
return -EINVAL;
if (desc.dtype != NFT_DATA_VERDICT) {
if (nla[NFTA_SET_DATA_LEN] == NULL)
return -EINVAL;
desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
return -EINVAL;
} else
desc.dlen = sizeof(struct nft_verdict);
} else if (flags & NFT_SET_MAP)
return -EINVAL;
if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
if (!(flags & NFT_SET_OBJECT))
return -EINVAL;
desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
if (desc.objtype == NFT_OBJECT_UNSPEC ||
desc.objtype > NFT_OBJECT_MAX)
return -EOPNOTSUPP;
} else if (flags & NFT_SET_OBJECT)
return -EINVAL;
else
desc.objtype = NFT_OBJECT_UNSPEC;
desc.timeout = 0;
if (nla[NFTA_SET_TIMEOUT] != NULL) {
if (!(flags & NFT_SET_TIMEOUT))
return -EINVAL;
if (flags & NFT_SET_ANONYMOUS)
return -EOPNOTSUPP;
err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
if (err)
return err;
}
desc.gc_int = 0;
if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
if (!(flags & NFT_SET_TIMEOUT))
return -EINVAL;
if (flags & NFT_SET_ANONYMOUS)
return -EOPNOTSUPP;
desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
}
desc.policy = NFT_SET_POL_PERFORMANCE;
if (nla[NFTA_SET_POLICY] != NULL) {
desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
switch (desc.policy) {
case NFT_SET_POL_PERFORMANCE:
case NFT_SET_POL_MEMORY:
break;
default:
return -EOPNOTSUPP;
}
}
if (nla[NFTA_SET_DESC] != NULL) {
err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
if (err < 0)
return err;
if (desc.field_count > 1) {
if (!(flags & NFT_SET_CONCAT))
return -EINVAL;
} else if (flags & NFT_SET_CONCAT) {
return -EINVAL;
}
} else if (flags & NFT_SET_CONCAT) {
return -EINVAL;
}
if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
desc.expr = true;
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
return PTR_ERR(table);
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
set = nft_set_lookup(net, table, nla[NFTA_SET_NAME], genmask);
if (IS_ERR(set)) {
if (PTR_ERR(set) != -ENOENT) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
return PTR_ERR(set);
}
} else {
struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
return -EEXIST;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
if (nft_set_is_anonymous(set))
return -EOPNOTSUPP;
err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
if (err < 0)
return err;
if (desc.size)
desc.size = nft_set_kernel_size(set->ops, &desc);
err = 0;
if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
err = -EEXIST;
}
for (i = 0; i < num_exprs; i++)
nft_expr_destroy(&ctx, exprs[i]);
if (err < 0)
return err;
return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
}
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
return -ENOENT;
ops = nft_select_set_ops(&ctx, flags, &desc);
if (IS_ERR(ops))
return PTR_ERR(ops);
if (desc.size)
desc.size = nft_set_kernel_size(ops, &desc);
udlen = 0;
if (nla[NFTA_SET_USERDATA])
udlen = nla_len(nla[NFTA_SET_USERDATA]);
size = 0;
if (ops->privsize != NULL)
size = ops->privsize(nla, &desc);
alloc_size = sizeof(*set) + size + udlen;
if (alloc_size < size || alloc_size > INT_MAX)
return -ENOMEM;
if (!nft_use_inc(&table->use))
return -EMFILE;
set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
if (!set) {
err = -ENOMEM;
goto err_alloc;
}
name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
if (!name) {
err = -ENOMEM;
goto err_set_name;
}
err = nf_tables_set_alloc_name(&ctx, set, name);
kfree(name);
if (err < 0)
goto err_set_name;
udata = NULL;
if (udlen) {
udata = set->data + size;
nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
}
INIT_LIST_HEAD(&set->bindings);
INIT_LIST_HEAD(&set->catchall_list);
refcount_set(&set->refs, 1);
set->table = table;
write_pnet(&set->net, net);
set->ops = ops;
set->ktype = desc.ktype;
set->klen = desc.klen;
set->dtype = desc.dtype;
set->objtype = desc.objtype;
set->dlen = desc.dlen;
set->flags = flags;
set->size = desc.size;
set->policy = desc.policy;
set->udlen = udlen;
set->udata = udata;
set->timeout = desc.timeout;
set->gc_int = desc.gc_int;
set->field_count = desc.field_count;
for (i = 0; i < desc.field_count; i++)
set->field_len[i] = desc.field_len[i];
err = ops->init(set, &desc, nla);
if (err < 0)
goto err_set_init;
err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
if (err < 0)
goto err_set_destroy;
set->num_exprs = num_exprs;
set->handle = nf_tables_alloc_handle(table);
INIT_LIST_HEAD(&set->pending_update);
err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
if (err < 0)
goto err_set_expr_alloc;
list_add_tail_rcu(&set->list, &table->sets);
return 0;
err_set_expr_alloc:
for (i = 0; i < set->num_exprs; i++)
nft_expr_destroy(&ctx, set->exprs[i]);
err_set_destroy:
ops->destroy(&ctx, set);
err_set_init:
kfree(set->name);
err_set_name:
kvfree(set);
err_alloc:
nft_use_dec_restore(&table->use);
return err;
}
static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
struct nft_set *set)
{
struct nft_set_elem_catchall *next, *catchall;
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
list_del_rcu(&catchall->list);
nf_tables_set_elem_destroy(ctx, set, catchall->elem);
kfree_rcu(catchall, rcu);
}
}
static void nft_set_put(struct nft_set *set)
{
if (refcount_dec_and_test(&set->refs)) {
kfree(set->name);
kvfree(set);
}
}
static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
{
int i;
if (WARN_ON(set->use > 0))
return;
for (i = 0; i < set->num_exprs; i++)
nft_expr_destroy(ctx, set->exprs[i]);
set->ops->destroy(ctx, set);
nft_set_catchall_destroy(ctx, set);
nft_set_put(set);
}
static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_set *set;
struct nft_ctx ctx;
if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
return -EAFNOSUPPORT;
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
return PTR_ERR(table);
}
if (nla[NFTA_SET_HANDLE]) {
attr = nla[NFTA_SET_HANDLE];
set = nft_set_lookup_byhandle(table, attr, genmask);
} else {
attr = nla[NFTA_SET_NAME];
set = nft_set_lookup(net, table, attr, genmask);
}
if (IS_ERR(set)) {
if (PTR_ERR(set) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
return 0;
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(set);
}
if (set->use ||
(info->nlh->nlmsg_flags & NLM_F_NONREC &&
atomic_read(&set->nelems) > 0)) {
NL_SET_BAD_ATTR(extack, attr);
return -EBUSY;
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
return nft_delset(&ctx, set);
}
static int nft_validate_register_store(const struct nft_ctx *ctx,
enum nft_registers reg,
const struct nft_data *data,
enum nft_data_types type,
unsigned int len);
static int nft_setelem_data_validate(const struct nft_ctx *ctx,
struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
enum nft_registers dreg;
dreg = nft_type_to_reg(set->dtype);
return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
set->dtype == NFT_DATA_VERDICT ?
NFT_DATA_VERDICT : NFT_DATA_VALUE,
set->dlen);
}
static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (!nft_set_elem_active(ext, iter->genmask))
return 0;
return nft_setelem_data_validate(ctx, set, elem_priv);
}
static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
struct nft_set *set)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
int ret = 0;
list_for_each_entry_rcu(catchall, &set->catchall_list, list,
lockdep_commit_lock_is_held(ctx->net)) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, genmask))
continue;
ret = nft_setelem_data_validate(ctx, set, catchall->elem);
if (ret < 0)
break;
}
return ret;
}
int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_binding *binding)
{
struct nft_set_binding *i;
struct nft_set_iter iter = {
.genmask = nft_genmask_next(ctx->net),
.type = NFT_ITER_UPDATE,
.fn = nf_tables_bind_check_setelem,
};
if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
return -EBUSY;
if (binding->flags & NFT_SET_MAP) {
list_for_each_entry(i, &set->bindings, list) {
if (i->flags & NFT_SET_MAP &&
i->chain == binding->chain)
goto bind;
}
set->ops->walk(ctx, set, &iter);
if (!iter.err)
iter.err = nft_set_catchall_bind_check(ctx, set);
if (iter.err < 0)
return iter.err;
}
bind:
if (!nft_use_inc(&set->use))
return -EMFILE;
binding->chain = ctx->chain;
list_add_tail_rcu(&binding->list, &set->bindings);
nft_set_trans_bind(ctx, set);
return 0;
}
EXPORT_SYMBOL_GPL(nf_tables_bind_set);
static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_binding *binding, bool event)
{
list_del_rcu(&binding->list);
if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
list_del_rcu(&set->list);
set->dead = 1;
if (event)
nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
GFP_KERNEL);
}
}
static void nft_setelem_data_activate(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv);
static int nft_mapelem_activate(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_set_elem_active(ext, iter->genmask))
return 0;
nft_clear(ctx->net, ext);
nft_setelem_data_activate(ctx->net, set, elem_priv);
return 0;
}
static void nft_map_catchall_activate(const struct nft_ctx *ctx,
struct nft_set *set)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
list_for_each_entry(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (nft_set_elem_active(ext, genmask))
continue;
nft_clear(ctx->net, ext);
nft_setelem_data_activate(ctx->net, set, catchall->elem);
}
}
static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
{
struct nft_set_iter iter = {
.genmask = nft_genmask_next(ctx->net),
.type = NFT_ITER_UPDATE,
.fn = nft_mapelem_activate,
};
set->ops->walk(ctx, set, &iter);
WARN_ON_ONCE(iter.err);
nft_map_catchall_activate(ctx, set);
}
void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
{
if (nft_set_is_anonymous(set)) {
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_activate(ctx, set);
nft_clear(ctx->net, set);
}
nft_use_inc_restore(&set->use);
}
EXPORT_SYMBOL_GPL(nf_tables_activate_set);
void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_binding *binding,
enum nft_trans_phase phase)
{
WARN_ON_ONCE(!lockdep_commit_lock_is_held(ctx->net));
switch (phase) {
case NFT_TRANS_PREPARE_ERROR:
nft_set_trans_unbind(ctx, set);
if (nft_set_is_anonymous(set))
nft_deactivate_next(ctx->net, set);
else
list_del_rcu(&binding->list);
nft_use_dec(&set->use);
break;
case NFT_TRANS_PREPARE:
if (nft_set_is_anonymous(set)) {
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_deactivate(ctx, set);
nft_deactivate_next(ctx->net, set);
}
nft_use_dec(&set->use);
return;
case NFT_TRANS_ABORT:
case NFT_TRANS_RELEASE:
if (nft_set_is_anonymous(set) &&
set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_deactivate(ctx, set);
nft_use_dec(&set->use);
fallthrough;
default:
nf_tables_unbind_set(ctx, set, binding,
phase == NFT_TRANS_COMMIT);
}
}
EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
{
if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
nft_set_destroy(ctx, set);
}
EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
const struct nft_set_ext_type nft_set_ext_types[] = {
[NFT_SET_EXT_KEY] = {
.align = __alignof__(u32),
},
[NFT_SET_EXT_DATA] = {
.align = __alignof__(u32),
},
[NFT_SET_EXT_EXPRESSIONS] = {
.align = __alignof__(struct nft_set_elem_expr),
},
[NFT_SET_EXT_OBJREF] = {
.len = sizeof(struct nft_object *),
.align = __alignof__(struct nft_object *),
},
[NFT_SET_EXT_FLAGS] = {
.len = sizeof(u8),
.align = __alignof__(u8),
},
[NFT_SET_EXT_TIMEOUT] = {
.len = sizeof(struct nft_timeout),
.align = __alignof__(struct nft_timeout),
},
[NFT_SET_EXT_USERDATA] = {
.len = sizeof(struct nft_userdata),
.align = __alignof__(struct nft_userdata),
},
[NFT_SET_EXT_KEY_END] = {
.align = __alignof__(u32),
},
};
static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
[NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
[NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
[NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
[NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
[NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
[NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
[NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
[NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
.len = NFT_OBJ_MAXNAMELEN - 1 },
[NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
[NFTA_SET_ELEM_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
};
static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
[NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
.len = NFT_SET_MAXNAMELEN - 1 },
[NFTA_SET_ELEM_LIST_ELEMENTS] = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
[NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
};
static int nft_set_elem_expr_dump(struct sk_buff *skb,
const struct nft_set *set,
const struct nft_set_ext *ext,
bool reset)
{
struct nft_set_elem_expr *elem_expr;
u32 size, num_exprs = 0;
struct nft_expr *expr;
struct nlattr *nest;
elem_expr = nft_set_ext_expr(ext);
nft_setelem_expr_foreach(expr, elem_expr, size)
num_exprs++;
if (num_exprs == 1) {
expr = nft_setelem_expr_at(elem_expr, 0);
if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
return -1;
return 0;
} else if (num_exprs > 1) {
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
if (nest == NULL)
goto nla_put_failure;
nft_setelem_expr_foreach(expr, elem_expr, size) {
expr = nft_setelem_expr_at(elem_expr, size);
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, nest);
}
return 0;
nla_put_failure:
return -1;
}
static int nf_tables_fill_setelem(struct sk_buff *skb,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool reset)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
unsigned char *b = skb_tail_pointer(skb);
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
if (nest == NULL)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
NFT_DATA_VALUE, set->klen) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
NFT_DATA_VALUE, set->klen) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
nft_set_datatype(set), set->dlen) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
nft_set_elem_expr_dump(skb, set, ext, reset))
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
(*nft_set_ext_obj(ext))->key.name) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
htonl(*nft_set_ext_flags(ext))))
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
u64 timeout = READ_ONCE(nft_set_ext_timeout(ext)->timeout);
u64 set_timeout = READ_ONCE(set->timeout);
__be64 msecs = 0;
if (set_timeout != timeout) {
msecs = nf_jiffies64_to_msecs(timeout);
if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, msecs,
NFTA_SET_ELEM_PAD))
goto nla_put_failure;
}
if (timeout > 0) {
u64 expires, now = get_jiffies_64();
expires = READ_ONCE(nft_set_ext_timeout(ext)->expiration);
if (time_before64(now, expires))
expires -= now;
else
expires = 0;
if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
nf_jiffies64_to_msecs(expires),
NFTA_SET_ELEM_PAD))
goto nla_put_failure;
}
}
if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
struct nft_userdata *udata;
udata = nft_set_ext_userdata(ext);
if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
udata->len + 1, udata->data))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
nlmsg_trim(skb, b);
return -EMSGSIZE;
}
struct nft_set_dump_args {
const struct netlink_callback *cb;
struct nft_set_iter iter;
struct sk_buff *skb;
bool reset;
};
static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
struct nft_set_dump_args *args;
if (!nft_set_elem_active(ext, iter->genmask))
return 0;
if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
return 0;
args = container_of(iter, struct nft_set_dump_args, iter);
return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
}
static void audit_log_nft_set_reset(const struct nft_table *table,
unsigned int base_seq,
unsigned int nentries)
{
char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
audit_log_nfcfg(buf, table->family, nentries,
AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
kfree(buf);
}
struct nft_set_dump_ctx {
const struct nft_set *set;
struct nft_ctx ctx;
bool reset;
};
static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
const struct nft_set *set, bool reset,
unsigned int base_seq)
{
struct nft_set_elem_catchall *catchall;
u8 genmask = nft_genmask_cur(net);
struct nft_set_ext *ext;
int ret = 0;
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, genmask) ||
nft_set_elem_expired(ext))
continue;
ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
if (reset && !ret)
audit_log_nft_set_reset(set->table, base_seq, 1);
break;
}
return ret;
}
static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nft_set_dump_ctx *dump_ctx = cb->data;
struct net *net = sock_net(skb->sk);
struct nftables_pernet *nft_net;
struct nft_table *table;
struct nft_set *set;
struct nft_set_dump_args args = {
.cb = cb,
.skb = skb,
.reset = dump_ctx->reset,
.iter = {
.genmask = nft_genmask_cur(net),
.type = NFT_ITER_READ,
.skip = cb->args[0],
.fn = nf_tables_dump_setelem,
},
};
bool set_found = false;
struct nlmsghdr *nlh;
struct nlattr *nest;
u32 portid, seq;
int event;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
dump_ctx->ctx.family != table->family)
continue;
if (table != dump_ctx->ctx.table)
continue;
list_for_each_entry_rcu(set, &table->sets, list) {
if (set == dump_ctx->set) {
set_found = true;
break;
}
}
break;
}
if (!set_found) {
rcu_read_unlock();
return -ENOENT;
}
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
portid = NETLINK_CB(cb->skb).portid;
seq = cb->nlh->nlmsg_seq;
nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
table->family, NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
if (nest == NULL)
goto nla_put_failure;
set->ops->walk(&dump_ctx->ctx, set, &args.iter);
if (!args.iter.err && args.iter.count == cb->args[0])
args.iter.err = nft_set_catchall_dump(net, skb, set,
dump_ctx->reset, cb->seq);
nla_nest_end(skb, nest);
nlmsg_end(skb, nlh);
if (dump_ctx->reset && args.iter.count > args.iter.skip)
audit_log_nft_set_reset(table, cb->seq,
args.iter.count - args.iter.skip);
rcu_read_unlock();
if (args.iter.err && args.iter.err != -EMSGSIZE)
return args.iter.err;
if (args.iter.count == cb->args[0])
return 0;
cb->args[0] = args.iter.count;
return skb->len;
nla_put_failure:
rcu_read_unlock();
return -ENOSPC;
}
static int nf_tables_dump_set_start(struct netlink_callback *cb)
{
struct nft_set_dump_ctx *dump_ctx = cb->data;
cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
return cb->data ? 0 : -ENOMEM;
}
static int nf_tables_dump_set_done(struct netlink_callback *cb)
{
kfree(cb->data);
return 0;
}
static int nf_tables_fill_setelem_info(struct sk_buff *skb,
const struct nft_ctx *ctx, u32 seq,
u32 portid, int event, u16 flags,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool reset)
{
struct nlmsghdr *nlh;
struct nlattr *nest;
int err;
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
NFNETLINK_V0, nft_base_seq_be16(ctx->net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure;
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
if (nest == NULL)
goto nla_put_failure;
err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
if (err < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
static int nft_setelem_parse_flags(const struct nft_set *set,
const struct nlattr *attr, u32 *flags)
{
if (attr == NULL)
return 0;
*flags = ntohl(nla_get_be32(attr));
if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
return -EOPNOTSUPP;
if (!(set->flags & NFT_SET_INTERVAL) &&
*flags & NFT_SET_ELEM_INTERVAL_END)
return -EINVAL;
if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
return -EINVAL;
return 0;
}
static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
struct nft_data *key, struct nlattr *attr)
{
struct nft_data_desc desc = {
.type = NFT_DATA_VALUE,
.size = NFT_DATA_VALUE_MAXLEN,
.len = set->klen,
};
return nft_data_init(ctx, key, &desc, attr);
}
static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
struct nft_data_desc *desc,
struct nft_data *data,
struct nlattr *attr)
{
u32 dtype;
if (set->dtype == NFT_DATA_VERDICT)
dtype = NFT_DATA_VERDICT;
else
dtype = NFT_DATA_VALUE;
desc->type = dtype;
desc->size = NFT_DATA_VALUE_MAXLEN;
desc->len = set->dlen;
desc->flags = NFT_DATA_DESC_SETELEM;
return nft_data_init(ctx, data, desc, attr);
}
static void *nft_setelem_catchall_get(const struct net *net,
const struct nft_set *set)
{
struct nft_set_elem_catchall *catchall;
u8 genmask = nft_genmask_cur(net);
struct nft_set_ext *ext;
void *priv = NULL;
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, genmask) ||
nft_set_elem_expired(ext))
continue;
priv = catchall->elem;
break;
}
return priv;
}
static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
struct nft_set_elem *elem, u32 flags)
{
void *priv;
if (!(flags & NFT_SET_ELEM_CATCHALL)) {
priv = set->ops->get(ctx->net, set, elem, flags);
if (IS_ERR(priv))
return PTR_ERR(priv);
} else {
priv = nft_setelem_catchall_get(ctx->net, set);
if (!priv)
return -ENOENT;
}
elem->priv = priv;
return 0;
}
static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
const struct nlattr *attr, bool reset)
{
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
struct nft_set_elem elem;
struct sk_buff *skb;
uint32_t flags = 0;
int err;
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
nft_set_elem_policy, NULL);
if (err < 0)
return err;
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
if (err < 0)
return err;
if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
return -EINVAL;
if (nla[NFTA_SET_ELEM_KEY]) {
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
nla[NFTA_SET_ELEM_KEY]);
if (err < 0)
return err;
}
if (nla[NFTA_SET_ELEM_KEY_END]) {
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
nla[NFTA_SET_ELEM_KEY_END]);
if (err < 0)
return err;
}
err = nft_setelem_get(ctx, set, &elem, flags);
if (err < 0)
return err;
err = -ENOMEM;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb == NULL)
return err;
err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
NFT_MSG_NEWSETELEM, 0, set, elem.priv,
reset);
if (err < 0)
goto err_fill_setelem;
return nfnetlink_unicast(skb, ctx->net, ctx->portid);
err_fill_setelem:
kfree_skb(skb);
return err;
}
static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
const struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[],
bool reset)
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
struct nft_table *table;
struct nft_set *set;
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
return PTR_ERR(table);
}
set = nft_set_lookup(net, table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
if (IS_ERR(set)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
}
nft_ctx_init(&dump_ctx->ctx, net, skb,
info->nlh, family, table, NULL, nla);
dump_ctx->set = set;
dump_ctx->reset = reset;
return 0;
}
static int nf_tables_getsetelem(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
struct nft_set_dump_ctx dump_ctx;
int rem, err = 0, nelems = 0;
struct net *net = info->net;
struct nlattr *attr;
bool reset = false;
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
reset = true;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = nf_tables_dump_set_start,
.dump = nf_tables_dump_set,
.done = nf_tables_dump_set_done,
.module = THIS_MODULE,
};
err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, reset);
if (err)
return err;
c.data = &dump_ctx;
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
return -EINVAL;
err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, reset);
if (err)
return err;
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, reset);
if (err < 0) {
NL_SET_BAD_ATTR(extack, attr);
break;
}
nelems++;
}
if (reset)
audit_log_nft_set_reset(dump_ctx.ctx.table, nft_base_seq(net),
nelems);
return err;
}
static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
int event)
{
struct nftables_pernet *nft_net;
struct net *net = ctx->net;
u32 portid = ctx->portid;
struct sk_buff *skb;
u16 flags = 0;
int err;
if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
goto err;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
set, elem_priv, false);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_net = nft_pernet(net);
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static struct nft_trans *nft_trans_elem_alloc(const struct nft_ctx *ctx,
int msg_type,
struct nft_set *set)
{
struct nft_trans_elem *te;
struct nft_trans *trans;
trans = nft_trans_alloc(ctx, msg_type, struct_size(te, elems, 1));
if (trans == NULL)
return NULL;
te = nft_trans_container_elem(trans);
te->nelems = 1;
te->set = set;
return trans;
}
struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nlattr *attr)
{
struct nft_expr *expr;
int err;
expr = nft_expr_init(ctx, attr);
if (IS_ERR(expr))
return expr;
err = -EOPNOTSUPP;
if (expr->ops->type->flags & NFT_EXPR_GC) {
if (set->flags & NFT_SET_TIMEOUT)
goto err_set_elem_expr;
if (!set->ops->gc_init)
goto err_set_elem_expr;
set->ops->gc_init(set);
}
return expr;
err_set_elem_expr:
nft_expr_destroy(ctx, expr);
return ERR_PTR(err);
}
static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
{
len += nft_set_ext_types[id].len;
if (len > tmpl->ext_len[id] ||
len > U8_MAX)
return -1;
return 0;
}
static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
void *to, const void *from, u32 len)
{
if (nft_set_ext_check(tmpl, id, len) < 0)
return -1;
memcpy(to, from, len);
return 0;
}
struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
const struct nft_set_ext_tmpl *tmpl,
const u32 *key, const u32 *key_end,
const u32 *data,
u64 timeout, u64 expiration, gfp_t gfp)
{
struct nft_set_ext *ext;
void *elem;
elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
if (elem == NULL)
return ERR_PTR(-ENOMEM);
ext = nft_set_elem_ext(set, elem);
nft_set_ext_init(ext, tmpl);
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
nft_set_ext_key(ext), key, set->klen) < 0)
goto err_ext_check;
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
nft_set_ext_key_end(ext), key_end, set->klen) < 0)
goto err_ext_check;
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
nft_set_ext_data(ext), data, set->dlen) < 0)
goto err_ext_check;
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
nft_set_ext_timeout(ext)->timeout = timeout;
if (expiration == 0)
expiration = timeout;
nft_set_ext_timeout(ext)->expiration = get_jiffies_64() + expiration;
}
return elem;
err_ext_check:
kfree(elem);
return ERR_PTR(-EINVAL);
}
static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
struct nft_expr *expr)
{
if (expr->ops->destroy_clone) {
expr->ops->destroy_clone(ctx, expr);
module_put(expr->ops->type->owner);
} else {
nf_tables_expr_destroy(ctx, expr);
}
}
void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
struct nft_set_elem_expr *elem_expr)
{
struct nft_expr *expr;
u32 size;
nft_setelem_expr_foreach(expr, elem_expr, size)
__nft_set_elem_expr_destroy(ctx, expr);
}
static void __nft_set_elem_destroy(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool destroy_expr)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
nft_data_release(nft_set_ext_data(ext), set->dtype);
if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
nft_use_dec(&(*nft_set_ext_obj(ext))->use);
kfree(elem_priv);
}
void nft_set_elem_destroy(const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool destroy_expr)
{
struct nft_ctx ctx = {
.net = read_pnet(&set->net),
.family = set->table->family,
};
__nft_set_elem_destroy(&ctx, set, elem_priv, destroy_expr);
}
EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
static void nft_trans_set_elem_destroy(const struct nft_ctx *ctx, struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++) {
if (!te->elems[i].priv)
continue;
__nft_set_elem_destroy(ctx, te->set, te->elems[i].priv, true);
}
}
void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
kfree(elem_priv);
}
static void nft_trans_elems_destroy(const struct nft_ctx *ctx,
const struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++)
nf_tables_set_elem_destroy(ctx, te->set, te->elems[i].priv);
}
int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_expr *expr_array[])
{
struct nft_expr *expr;
int err, i, k;
for (i = 0; i < set->num_exprs; i++) {
expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
if (!expr)
goto err_expr;
err = nft_expr_clone(expr, set->exprs[i], GFP_KERNEL_ACCOUNT);
if (err < 0) {
kfree(expr);
goto err_expr;
}
expr_array[i] = expr;
}
return 0;
err_expr:
for (k = i - 1; k >= 0; k--)
nft_expr_destroy(ctx, expr_array[k]);
return -ENOMEM;
}
static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
const struct nft_set_ext_tmpl *tmpl,
const struct nft_set_ext *ext,
struct nft_expr *expr_array[],
u32 num_exprs)
{
struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
u32 len = sizeof(struct nft_set_elem_expr);
struct nft_expr *expr;
int i, err;
if (num_exprs == 0)
return 0;
for (i = 0; i < num_exprs; i++)
len += expr_array[i]->ops->size;
if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
return -EINVAL;
for (i = 0; i < num_exprs; i++) {
expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
err = nft_expr_clone(expr, expr_array[i], GFP_KERNEL_ACCOUNT);
if (err < 0)
goto err_elem_expr_setup;
elem_expr->size += expr_array[i]->ops->size;
nft_expr_destroy(ctx, expr_array[i]);
expr_array[i] = NULL;
}
return 0;
err_elem_expr_setup:
for (; i < num_exprs; i++) {
nft_expr_destroy(ctx, expr_array[i]);
expr_array[i] = NULL;
}
return -ENOMEM;
}
struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
const struct nft_set *set)
{
struct nft_set_elem_catchall *catchall;
u8 genmask = nft_genmask_cur(net);
struct nft_set_ext *ext;
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (nft_set_elem_active(ext, genmask) &&
!nft_set_elem_expired(ext) &&
!nft_set_elem_is_dead(ext))
return ext;
}
return NULL;
}
EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
static int nft_setelem_catchall_insert(const struct net *net,
struct nft_set *set,
const struct nft_set_elem *elem,
struct nft_elem_priv **priv)
{
struct nft_set_elem_catchall *catchall;
u8 genmask = nft_genmask_next(net);
struct nft_set_ext *ext;
list_for_each_entry(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (nft_set_elem_active(ext, genmask)) {
*priv = catchall->elem;
return -EEXIST;
}
}
catchall = kmalloc_obj(*catchall, GFP_KERNEL_ACCOUNT);
if (!catchall)
return -ENOMEM;
catchall->elem = elem->priv;
list_add_tail_rcu(&catchall->list, &set->catchall_list);
return 0;
}
static int nft_setelem_insert(const struct net *net,
struct nft_set *set,
const struct nft_set_elem *elem,
struct nft_elem_priv **elem_priv,
unsigned int flags)
{
int ret;
if (flags & NFT_SET_ELEM_CATCHALL)
ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
else
ret = set->ops->insert(net, set, elem, elem_priv);
return ret;
}
static bool nft_setelem_is_catchall(const struct nft_set *set,
const struct nft_elem_priv *elem_priv)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
*nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
return true;
return false;
}
static void nft_setelem_activate(struct net *net, struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_setelem_is_catchall(set, elem_priv)) {
nft_clear(net, ext);
} else {
set->ops->activate(net, set, elem_priv);
}
}
static void nft_trans_elem_update(const struct nft_set *set,
const struct nft_trans_one_elem *elem)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
const struct nft_elem_update *update = elem->update;
if (update->flags & NFT_TRANS_UPD_TIMEOUT)
WRITE_ONCE(nft_set_ext_timeout(ext)->timeout, update->timeout);
if (update->flags & NFT_TRANS_UPD_EXPIRATION)
WRITE_ONCE(nft_set_ext_timeout(ext)->expiration, get_jiffies_64() + update->expiration);
}
static void nft_trans_elems_add(const struct nft_ctx *ctx,
struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++) {
struct nft_trans_one_elem *elem = &te->elems[i];
if (elem->update)
nft_trans_elem_update(te->set, elem);
else
nft_setelem_activate(ctx->net, te->set, elem->priv);
nf_tables_setelem_notify(ctx, te->set, elem->priv,
NFT_MSG_NEWSETELEM);
kfree(elem->update);
}
}
static int nft_setelem_catchall_deactivate(const struct net *net,
struct nft_set *set,
struct nft_set_elem *elem)
{
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
list_for_each_entry(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_is_active_next(net, ext))
continue;
kfree(elem->priv);
elem->priv = catchall->elem;
nft_set_elem_change_active(net, set, ext);
return 0;
}
return -ENOENT;
}
static int __nft_setelem_deactivate(const struct net *net,
struct nft_set *set,
struct nft_set_elem *elem)
{
void *priv;
priv = set->ops->deactivate(net, set, elem);
if (!priv)
return -ENOENT;
kfree(elem->priv);
elem->priv = priv;
set->ndeact++;
return 0;
}
static int nft_setelem_deactivate(const struct net *net,
struct nft_set *set,
struct nft_set_elem *elem, u32 flags)
{
int ret;
if (flags & NFT_SET_ELEM_CATCHALL)
ret = nft_setelem_catchall_deactivate(net, set, elem);
else
ret = __nft_setelem_deactivate(net, set, elem);
return ret;
}
static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
{
list_del_rcu(&catchall->list);
kfree_rcu(catchall, rcu);
}
static void nft_setelem_catchall_remove(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
struct nft_set_elem_catchall *catchall, *next;
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
if (catchall->elem == elem_priv) {
nft_setelem_catchall_destroy(catchall);
break;
}
}
}
static void nft_setelem_remove(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
if (nft_setelem_is_catchall(set, elem_priv))
nft_setelem_catchall_remove(net, set, elem_priv);
else
set->ops->remove(net, set, elem_priv);
}
static void nft_trans_elems_remove(const struct nft_ctx *ctx,
const struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++) {
WARN_ON_ONCE(te->elems[i].update);
nf_tables_setelem_notify(ctx, te->set,
te->elems[i].priv,
te->nft_trans.msg_type);
nft_setelem_remove(ctx->net, te->set, te->elems[i].priv);
if (!nft_setelem_is_catchall(te->set, te->elems[i].priv)) {
atomic_dec(&te->set->nelems);
te->set->ndeact--;
}
}
}
static bool nft_setelem_valid_key_end(const struct nft_set *set,
struct nlattr **nla, u32 flags)
{
if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
(NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
if (flags & NFT_SET_ELEM_INTERVAL_END)
return false;
if (nla[NFTA_SET_ELEM_KEY_END] &&
flags & NFT_SET_ELEM_CATCHALL)
return false;
} else {
if (nla[NFTA_SET_ELEM_KEY_END])
return false;
}
return true;
}
static u32 nft_set_maxsize(const struct nft_set *set)
{
u32 maxsize, delta;
if (!set->size)
return UINT_MAX;
if (set->ops->adjust_maxsize)
delta = set->ops->adjust_maxsize(set);
else
delta = 0;
if (check_add_overflow(set->size, set->ndeact, &maxsize))
return UINT_MAX;
if (check_add_overflow(maxsize, delta, &maxsize))
return UINT_MAX;
return maxsize;
}
static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr *attr, u32 nlmsg_flags)
{
struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
u8 genmask = nft_genmask_next(ctx->net);
u32 flags = 0, size = 0, num_exprs = 0;
struct nft_set_ext_tmpl tmpl;
struct nft_set_ext *ext, *ext2;
struct nft_set_elem elem;
struct nft_set_binding *binding;
struct nft_elem_priv *elem_priv;
struct nft_object *obj = NULL;
struct nft_userdata *udata;
struct nft_data_desc desc;
enum nft_registers dreg;
struct nft_trans *trans;
bool set_full = false;
u64 expiration;
u64 timeout;
int err, i;
u8 ulen;
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
nft_set_elem_policy, NULL);
if (err < 0)
return err;
nft_set_ext_prepare(&tmpl);
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
if (err < 0)
return err;
if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
(!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
return -EINVAL;
if (flags != 0) {
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
if (err < 0)
return err;
}
if (set->flags & NFT_SET_MAP) {
if (nla[NFTA_SET_ELEM_DATA] == NULL &&
!(flags & NFT_SET_ELEM_INTERVAL_END))
return -EINVAL;
} else {
if (nla[NFTA_SET_ELEM_DATA] != NULL)
return -EINVAL;
}
if (set->flags & NFT_SET_OBJECT) {
if (!nla[NFTA_SET_ELEM_OBJREF] &&
!(flags & NFT_SET_ELEM_INTERVAL_END))
return -EINVAL;
} else {
if (nla[NFTA_SET_ELEM_OBJREF])
return -EINVAL;
}
if (!nft_setelem_valid_key_end(set, nla, flags))
return -EINVAL;
if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
(nla[NFTA_SET_ELEM_DATA] ||
nla[NFTA_SET_ELEM_OBJREF] ||
nla[NFTA_SET_ELEM_TIMEOUT] ||
nla[NFTA_SET_ELEM_EXPIRATION] ||
nla[NFTA_SET_ELEM_USERDATA] ||
nla[NFTA_SET_ELEM_EXPR] ||
nla[NFTA_SET_ELEM_KEY_END] ||
nla[NFTA_SET_ELEM_EXPRESSIONS]))
return -EINVAL;
timeout = 0;
if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
if (!(set->flags & NFT_SET_TIMEOUT))
return -EINVAL;
err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
&timeout);
if (err)
return err;
} else if (set->flags & NFT_SET_TIMEOUT &&
!(flags & NFT_SET_ELEM_INTERVAL_END)) {
timeout = set->timeout;
}
expiration = 0;
if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
if (!(set->flags & NFT_SET_TIMEOUT))
return -EINVAL;
if (timeout == 0)
return -EOPNOTSUPP;
err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
&expiration);
if (err)
return err;
if (expiration > timeout)
return -ERANGE;
}
if (nla[NFTA_SET_ELEM_EXPR]) {
struct nft_expr *expr;
if (set->num_exprs && set->num_exprs != 1)
return -EOPNOTSUPP;
expr = nft_set_elem_expr_alloc(ctx, set,
nla[NFTA_SET_ELEM_EXPR]);
if (IS_ERR(expr))
return PTR_ERR(expr);
expr_array[0] = expr;
num_exprs = 1;
if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
} else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
struct nft_expr *expr;
struct nlattr *tmp;
int left;
i = 0;
nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
if (i == NFT_SET_EXPR_MAX ||
(set->num_exprs && set->num_exprs == i)) {
err = -E2BIG;
goto err_set_elem_expr;
}
if (nla_type(tmp) != NFTA_LIST_ELEM) {
err = -EINVAL;
goto err_set_elem_expr;
}
expr = nft_set_elem_expr_alloc(ctx, set, tmp);
if (IS_ERR(expr)) {
err = PTR_ERR(expr);
goto err_set_elem_expr;
}
expr_array[i] = expr;
num_exprs++;
if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
i++;
}
if (set->num_exprs && set->num_exprs != i) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
} else if (set->num_exprs > 0 &&
!(flags & NFT_SET_ELEM_INTERVAL_END)) {
err = nft_set_elem_expr_clone(ctx, set, expr_array);
if (err < 0)
goto err_set_elem_expr_clone;
num_exprs = set->num_exprs;
}
if (nla[NFTA_SET_ELEM_KEY]) {
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
nla[NFTA_SET_ELEM_KEY]);
if (err < 0)
goto err_set_elem_expr;
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
if (err < 0)
goto err_parse_key;
}
if (nla[NFTA_SET_ELEM_KEY_END]) {
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
nla[NFTA_SET_ELEM_KEY_END]);
if (err < 0)
goto err_parse_key;
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
if (err < 0)
goto err_parse_key_end;
}
if (set->flags & NFT_SET_TIMEOUT) {
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
if (err < 0)
goto err_parse_key_end;
}
if (num_exprs) {
for (i = 0; i < num_exprs; i++)
size += expr_array[i]->ops->size;
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
sizeof(struct nft_set_elem_expr) + size);
if (err < 0)
goto err_parse_key_end;
}
if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
obj = nft_obj_lookup(ctx->net, ctx->table,
nla[NFTA_SET_ELEM_OBJREF],
set->objtype, genmask);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
obj = NULL;
goto err_parse_key_end;
}
if (!nft_use_inc(&obj->use)) {
err = -EMFILE;
obj = NULL;
goto err_parse_key_end;
}
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
if (err < 0)
goto err_parse_key_end;
}
if (nla[NFTA_SET_ELEM_DATA] != NULL) {
err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
nla[NFTA_SET_ELEM_DATA]);
if (err < 0)
goto err_parse_key_end;
dreg = nft_type_to_reg(set->dtype);
list_for_each_entry(binding, &set->bindings, list) {
struct nft_ctx bind_ctx = {
.net = ctx->net,
.family = ctx->family,
.table = ctx->table,
.chain = (struct nft_chain *)binding->chain,
};
if (!(binding->flags & NFT_SET_MAP))
continue;
err = nft_validate_register_store(&bind_ctx, dreg,
&elem.data.val,
desc.type, desc.len);
if (err < 0)
goto err_parse_data;
if (desc.type == NFT_DATA_VERDICT &&
(elem.data.val.verdict.code == NFT_GOTO ||
elem.data.val.verdict.code == NFT_JUMP))
nft_validate_state_update(ctx->table,
NFT_VALIDATE_NEED);
}
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
if (err < 0)
goto err_parse_data;
}
ulen = 0;
if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
if (ulen > 0) {
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
ulen);
if (err < 0)
goto err_parse_data;
}
}
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
elem.key_end.val.data, elem.data.val.data,
timeout, expiration, GFP_KERNEL_ACCOUNT);
if (IS_ERR(elem.priv)) {
err = PTR_ERR(elem.priv);
goto err_parse_data;
}
ext = nft_set_elem_ext(set, elem.priv);
if (flags)
*nft_set_ext_flags(ext) = flags;
if (obj)
*nft_set_ext_obj(ext) = obj;
if (ulen > 0) {
if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
err = -EINVAL;
goto err_elem_free;
}
udata = nft_set_ext_userdata(ext);
udata->len = ulen - 1;
nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
}
err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
if (err < 0)
goto err_elem_free;
if (!(flags & NFT_SET_ELEM_CATCHALL)) {
unsigned int max = nft_set_maxsize(set), nelems;
nelems = atomic_inc_return(&set->nelems);
if (nelems > max)
set_full = true;
}
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
if (trans == NULL) {
err = -ENOMEM;
goto err_set_size;
}
ext->genmask = nft_genmask_cur(ctx->net);
err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
if (err) {
if (err == -EEXIST) {
ext2 = nft_set_elem_ext(set, elem_priv);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
goto err_element_clash;
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
memcmp(nft_set_ext_data(ext),
nft_set_ext_data(ext2), set->dlen) != 0) ||
(nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
*nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
goto err_element_clash;
else if (!(nlmsg_flags & NLM_F_EXCL)) {
err = 0;
if (nft_set_ext_exists(ext2, NFT_SET_EXT_TIMEOUT)) {
struct nft_elem_update update = { };
if (timeout != nft_set_ext_timeout(ext2)->timeout) {
update.timeout = timeout;
if (expiration == 0)
expiration = timeout;
update.flags |= NFT_TRANS_UPD_TIMEOUT;
}
if (expiration) {
update.expiration = expiration;
update.flags |= NFT_TRANS_UPD_EXPIRATION;
}
if (update.flags) {
struct nft_trans_one_elem *ue;
ue = &nft_trans_container_elem(trans)->elems[0];
ue->update = kmemdup(&update, sizeof(update), GFP_KERNEL);
if (!ue->update) {
err = -ENOMEM;
goto err_element_clash;
}
ue->priv = elem_priv;
nft_trans_commit_list_add_elem(ctx->net, trans);
goto err_set_size;
}
}
}
} else if (err == -ENOTEMPTY) {
err = -EEXIST;
} else if (err == -ECANCELED) {
err = 0;
}
goto err_element_clash;
}
nft_trans_container_elem(trans)->elems[0].priv = elem.priv;
nft_trans_commit_list_add_elem(ctx->net, trans);
return set_full ? -ENFILE : 0;
err_element_clash:
kfree(trans);
err_set_size:
if (!(flags & NFT_SET_ELEM_CATCHALL))
atomic_dec(&set->nelems);
err_elem_free:
nf_tables_set_elem_destroy(ctx, set, elem.priv);
err_parse_data:
if (nla[NFTA_SET_ELEM_DATA] != NULL)
nft_data_release(&elem.data.val, desc.type);
err_parse_key_end:
if (obj)
nft_use_dec_restore(&obj->use);
nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
err_parse_key:
nft_data_release(&elem.key.val, NFT_DATA_VALUE);
err_set_elem_expr:
for (i = 0; i < num_exprs && expr_array[i]; i++)
nft_expr_destroy(ctx, expr_array[i]);
err_set_elem_expr_clone:
return err;
}
static int nf_tables_newsetelem(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_set *set;
struct nft_ctx ctx;
int rem, err;
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
return PTR_ERR(table);
}
set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
if (IS_ERR(set)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
}
if (!list_empty(&set->bindings) &&
(set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
return -EBUSY;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
if (err < 0) {
NL_SET_BAD_ATTR(extack, attr);
return err;
}
}
if (table->validate_state == NFT_VALIDATE_DO)
return nft_table_validate(net, table);
return 0;
}
void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
{
struct nft_chain *chain;
if (type == NFT_DATA_VERDICT) {
switch (data->verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
chain = data->verdict.chain;
nft_use_inc_restore(&chain->use);
break;
}
}
}
static int nft_setelem_active_next(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
u8 genmask = nft_genmask_next(net);
return nft_set_elem_active(ext, genmask);
}
static void nft_setelem_data_activate(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
nft_data_hold(nft_set_ext_data(ext), set->dtype);
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
}
void nft_setelem_data_deactivate(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
nft_data_release(nft_set_ext_data(ext), set->dtype);
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
nft_use_dec(&(*nft_set_ext_obj(ext))->use);
}
static bool nft_trans_elems_new_abort(const struct nft_ctx *ctx,
struct nft_trans_elem *te)
{
bool removed = false;
int i;
for (i = 0; i < te->nelems; i++) {
if (te->elems[i].update) {
kfree(te->elems[i].update);
te->elems[i].update = NULL;
te->elems[i].priv = NULL;
continue;
}
if (!te->set->ops->abort_skip_removal ||
nft_setelem_is_catchall(te->set, te->elems[i].priv))
nft_setelem_remove(ctx->net, te->set, te->elems[i].priv);
if (!nft_setelem_is_catchall(te->set, te->elems[i].priv))
atomic_dec(&te->set->nelems);
removed = true;
}
return removed;
}
static void nft_trans_elems_destroy_abort(const struct nft_ctx *ctx,
const struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++) {
if (!nft_setelem_active_next(ctx->net, te->set, te->elems[i].priv)) {
nft_setelem_data_activate(ctx->net, te->set, te->elems[i].priv);
nft_setelem_activate(ctx->net, te->set, te->elems[i].priv);
}
if (!nft_setelem_is_catchall(te->set, te->elems[i].priv))
te->set->ndeact--;
}
}
static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr *attr)
{
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
struct nft_set_ext_tmpl tmpl;
struct nft_set_elem elem;
struct nft_set_ext *ext;
struct nft_trans *trans;
u32 flags = 0;
int err;
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
nft_set_elem_policy, NULL);
if (err < 0)
return err;
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
if (err < 0)
return err;
if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
return -EINVAL;
if (!nft_setelem_valid_key_end(set, nla, flags))
return -EINVAL;
nft_set_ext_prepare(&tmpl);
if (flags != 0) {
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
if (err < 0)
return err;
}
if (nla[NFTA_SET_ELEM_KEY]) {
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
nla[NFTA_SET_ELEM_KEY]);
if (err < 0)
return err;
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
if (err < 0)
goto fail_elem;
}
if (nla[NFTA_SET_ELEM_KEY_END]) {
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
nla[NFTA_SET_ELEM_KEY_END]);
if (err < 0)
goto fail_elem;
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
if (err < 0)
goto fail_elem_key_end;
}
err = -ENOMEM;
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
elem.key_end.val.data, NULL, 0, 0,
GFP_KERNEL_ACCOUNT);
if (IS_ERR(elem.priv)) {
err = PTR_ERR(elem.priv);
goto fail_elem_key_end;
}
ext = nft_set_elem_ext(set, elem.priv);
if (flags)
*nft_set_ext_flags(ext) = flags;
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
if (trans == NULL)
goto fail_trans;
err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
if (err < 0)
goto fail_ops;
nft_setelem_data_deactivate(ctx->net, set, elem.priv);
nft_trans_container_elem(trans)->elems[0].priv = elem.priv;
nft_trans_commit_list_add_elem(ctx->net, trans);
return 0;
fail_ops:
kfree(trans);
fail_trans:
kfree(elem.priv);
fail_elem_key_end:
nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
fail_elem:
nft_data_release(&elem.key.val, NFT_DATA_VALUE);
return err;
}
static int nft_setelem_flush(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
struct nft_trans *trans;
if (!nft_set_elem_active(ext, iter->genmask))
return 0;
trans = nft_trans_alloc(ctx, NFT_MSG_DELSETELEM,
struct_size_t(struct nft_trans_elem, elems, 1));
if (!trans)
return -ENOMEM;
set->ops->flush(ctx->net, set, elem_priv);
set->ndeact++;
nft_setelem_data_deactivate(ctx->net, set, elem_priv);
nft_trans_elem_set(trans) = set;
nft_trans_container_elem(trans)->nelems = 1;
nft_trans_container_elem(trans)->elems[0].priv = elem_priv;
nft_trans_commit_list_add_elem(ctx->net, trans);
return 0;
}
static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
struct nft_set *set,
struct nft_elem_priv *elem_priv)
{
struct nft_trans *trans;
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
if (!trans)
return -ENOMEM;
nft_setelem_data_deactivate(ctx->net, set, elem_priv);
nft_trans_container_elem(trans)->elems[0].priv = elem_priv;
nft_trans_commit_list_add_elem(ctx->net, trans);
return 0;
}
static int nft_set_catchall_flush(const struct nft_ctx *ctx,
struct nft_set *set)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set_elem_catchall *catchall;
struct nft_set_ext *ext;
int ret = 0;
list_for_each_entry_rcu(catchall, &set->catchall_list, list,
lockdep_commit_lock_is_held(ctx->net)) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_active(ext, genmask))
continue;
ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
if (ret < 0)
break;
nft_set_elem_change_active(ctx->net, set, ext);
}
return ret;
}
static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
{
struct nft_set_iter iter = {
.genmask = genmask,
.type = NFT_ITER_UPDATE_CLONE,
.fn = nft_setelem_flush,
};
set->ops->walk(ctx, set, &iter);
if (!iter.err)
iter.err = nft_set_catchall_flush(ctx, set);
return iter.err;
}
static int nf_tables_delsetelem(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_set *set;
struct nft_ctx ctx;
int rem, err = 0;
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
return PTR_ERR(table);
}
set = nft_set_lookup(net, table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
if (IS_ERR(set)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
}
if (nft_set_is_anonymous(set))
return -EOPNOTSUPP;
if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
return -EBUSY;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
return nft_set_flush(&ctx, set, genmask);
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
err = nft_del_setelem(&ctx, set, attr);
if (err == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
continue;
if (err < 0) {
NL_SET_BAD_ATTR(extack, attr);
return err;
}
}
return 0;
}
int nft_register_obj(struct nft_object_type *obj_type)
{
if (obj_type->type == NFT_OBJECT_UNSPEC)
return -EINVAL;
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_add_rcu(&obj_type->list, &nf_tables_objects);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
return 0;
}
EXPORT_SYMBOL_GPL(nft_register_obj);
void nft_unregister_obj(struct nft_object_type *obj_type)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_del_rcu(&obj_type->list);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_obj);
struct nft_object *nft_obj_lookup(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u32 objtype,
u8 genmask)
{
struct nft_object_hash_key k = { .table = table };
char search[NFT_OBJ_MAXNAMELEN];
struct rhlist_head *tmp, *list;
struct nft_object *obj;
nla_strscpy(search, nla, sizeof(search));
k.name = search;
WARN_ON_ONCE(!rcu_read_lock_held() &&
!lockdep_commit_lock_is_held(net));
rcu_read_lock();
list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
if (!list)
goto out;
rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
if (objtype == obj->ops->type->type &&
nft_active_genmask(obj, genmask)) {
rcu_read_unlock();
return obj;
}
}
out:
rcu_read_unlock();
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL_GPL(nft_obj_lookup);
static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
const struct nlattr *nla,
u32 objtype, u8 genmask)
{
struct nft_object *obj;
list_for_each_entry(obj, &table->objects, list) {
if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
objtype == obj->ops->type->type &&
nft_active_genmask(obj, genmask))
return obj;
}
return ERR_PTR(-ENOENT);
}
static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
[NFTA_OBJ_TABLE] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_OBJ_NAME] = { .type = NLA_STRING,
.len = NFT_OBJ_MAXNAMELEN - 1 },
[NFTA_OBJ_TYPE] = { .type = NLA_U32 },
[NFTA_OBJ_DATA] = { .type = NLA_NESTED },
[NFTA_OBJ_HANDLE] = { .type = NLA_U64},
[NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
};
static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
const struct nft_object_type *type,
const struct nlattr *attr)
{
struct nlattr **tb;
const struct nft_object_ops *ops;
struct nft_object *obj;
int err = -ENOMEM;
tb = kmalloc_objs(*tb, type->maxattr + 1);
if (!tb)
goto err1;
if (attr) {
err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
type->policy, NULL);
if (err < 0)
goto err2;
} else {
memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
}
if (type->select_ops) {
ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
if (IS_ERR(ops)) {
err = PTR_ERR(ops);
goto err2;
}
} else {
ops = type->ops;
}
err = -ENOMEM;
obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
if (!obj)
goto err2;
err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
if (err < 0)
goto err3;
obj->ops = ops;
kfree(tb);
return obj;
err3:
kfree(obj);
err2:
kfree(tb);
err1:
return ERR_PTR(err);
}
static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
struct nft_object *obj, bool reset)
{
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, attr);
if (!nest)
goto nla_put_failure;
if (obj->ops->dump(skb, obj, reset) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
return -1;
}
static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
{
const struct nft_object_type *type;
list_for_each_entry_rcu(type, &nf_tables_objects, list) {
if (type->family != NFPROTO_UNSPEC &&
type->family != family)
continue;
if (objtype == type->type)
return type;
}
return NULL;
}
static const struct nft_object_type *
nft_obj_type_get(struct net *net, u32 objtype, u8 family)
{
const struct nft_object_type *type;
rcu_read_lock();
type = __nft_obj_type_get(objtype, family);
if (type != NULL && try_module_get(type->owner)) {
rcu_read_unlock();
return type;
}
rcu_read_unlock();
lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
if (type == NULL) {
if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
return ERR_PTR(-EAGAIN);
}
#endif
return ERR_PTR(-ENOENT);
}
static int nf_tables_updobj(const struct nft_ctx *ctx,
const struct nft_object_type *type,
const struct nlattr *attr,
struct nft_object *obj)
{
struct nft_object *newobj;
struct nft_trans *trans;
int err = -ENOMEM;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
sizeof(struct nft_trans_obj));
if (!trans)
goto err_trans;
newobj = nft_obj_init(ctx, type, attr);
if (IS_ERR(newobj)) {
err = PTR_ERR(newobj);
goto err_free_trans;
}
nft_trans_obj(trans) = obj;
nft_trans_obj_update(trans) = true;
nft_trans_obj_newobj(trans) = newobj;
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_free_trans:
kfree(trans);
err_trans:
module_put(type->owner);
return err;
}
static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_object_type *type;
struct net *net = info->net;
struct nft_table *table;
struct nft_object *obj;
struct nft_ctx ctx;
u32 objtype;
int err;
if (!nla[NFTA_OBJ_TYPE] ||
!nla[NFTA_OBJ_NAME] ||
!nla[NFTA_OBJ_DATA])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
}
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
if (err != -ENOENT) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
return err;
}
} else {
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
return -EEXIST;
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
if (!obj->ops->update)
return 0;
type = nft_obj_type_get(net, objtype, family);
if (WARN_ON_ONCE(IS_ERR(type)))
return PTR_ERR(type);
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
if (!nft_use_inc(&table->use))
return -EMFILE;
type = nft_obj_type_get(net, objtype, family);
if (IS_ERR(type)) {
err = PTR_ERR(type);
goto err_type;
}
obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto err_init;
}
obj->key.table = table;
obj->handle = nf_tables_alloc_handle(table);
obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
if (!obj->key.name) {
err = -ENOMEM;
goto err_strdup;
}
if (nla[NFTA_OBJ_USERDATA]) {
obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
if (obj->udata == NULL)
goto err_userdata;
obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
}
err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
if (err < 0)
goto err_trans;
err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
nft_objname_ht_params);
if (err < 0)
goto err_obj_ht;
list_add_tail_rcu(&obj->list, &table->objects);
return 0;
err_obj_ht:
INIT_LIST_HEAD(&obj->list);
return err;
err_trans:
kfree(obj->udata);
err_userdata:
kfree(obj->key.name);
err_strdup:
if (obj->ops->destroy)
obj->ops->destroy(&ctx, obj);
kfree(obj);
err_init:
module_put(type->owner);
err_type:
nft_use_dec_restore(&table->use);
return err;
}
static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event, u32 flags,
int family, const struct nft_table *table,
struct nft_object *obj, bool reset)
{
struct nlmsghdr *nlh;
nlh = nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event),
flags, family, NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
NFTA_OBJ_PAD))
goto nla_put_failure;
if (event == NFT_MSG_DELOBJ ||
event == NFT_MSG_DESTROYOBJ) {
nlmsg_end(skb, nlh);
return 0;
}
if (nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
goto nla_put_failure;
if (obj->udata &&
nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
static void audit_log_obj_reset(const struct nft_table *table,
unsigned int base_seq, unsigned int nentries)
{
char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
audit_log_nfcfg(buf, table->family, nentries,
AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
kfree(buf);
}
struct nft_obj_dump_ctx {
unsigned int s_idx;
char *table;
u32 type;
bool reset;
};
static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct nftables_pernet *nft_net;
const struct nft_table *table;
unsigned int entries = 0;
struct nft_object *obj;
unsigned int idx = 0;
int rc = 0;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (family != NFPROTO_UNSPEC && family != table->family)
continue;
entries = 0;
list_for_each_entry_rcu(obj, &table->objects, list) {
if (!nft_is_active(net, obj))
goto cont;
if (idx < ctx->s_idx)
goto cont;
if (ctx->table && strcmp(ctx->table, table->name))
goto cont;
if (ctx->type != NFT_OBJECT_UNSPEC &&
obj->ops->type->type != ctx->type)
goto cont;
rc = nf_tables_fill_obj_info(skb, net,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWOBJ,
NLM_F_MULTI | NLM_F_APPEND,
table->family, table,
obj, ctx->reset);
if (rc < 0)
break;
entries++;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
if (ctx->reset && entries)
audit_log_obj_reset(table, nft_base_seq(net), entries);
if (rc < 0)
break;
}
rcu_read_unlock();
ctx->s_idx = idx;
return skb->len;
}
static int nf_tables_dump_obj_start(struct netlink_callback *cb)
{
struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
const struct nlattr * const *nla = cb->data;
BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
if (nla[NFTA_OBJ_TABLE]) {
ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
if (!ctx->table)
return -ENOMEM;
}
if (nla[NFTA_OBJ_TYPE])
ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
ctx->reset = true;
return 0;
}
static int nf_tables_dump_obj_done(struct netlink_callback *cb)
{
struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
kfree(ctx->table);
return 0;
}
static struct sk_buff *
nf_tables_getobj_single(u32 portid, const struct nfnl_info *info,
const struct nlattr * const nla[], bool reset)
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nft_table *table;
struct net *net = info->net;
struct nft_object *obj;
struct sk_buff *skb2;
u32 objtype;
int err;
if (!nla[NFTA_OBJ_NAME] ||
!nla[NFTA_OBJ_TYPE])
return ERR_PTR(-EINVAL);
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return ERR_CAST(table);
}
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
if (IS_ERR(obj)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
return ERR_CAST(obj);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return ERR_PTR(-ENOMEM);
err = nf_tables_fill_obj_info(skb2, net, portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
family, table, obj, reset);
if (err < 0) {
kfree_skb(skb2);
return ERR_PTR(err);
}
return skb2;
}
static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
u32 portid = NETLINK_CB(skb).portid;
struct net *net = info->net;
struct sk_buff *skb2;
bool reset = false;
char *buf;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = nf_tables_dump_obj_start,
.dump = nf_tables_dump_obj,
.done = nf_tables_dump_obj_done,
.module = THIS_MODULE,
.data = (void *)nla,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
reset = true;
skb2 = nf_tables_getobj_single(portid, info, nla, reset);
if (IS_ERR(skb2))
return PTR_ERR(skb2);
if (!reset)
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
nla_len(nla[NFTA_OBJ_TABLE]),
(char *)nla_data(nla[NFTA_OBJ_TABLE]),
nft_base_seq(net));
audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
kfree(buf);
return nfnetlink_unicast(skb2, net, portid);
}
static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
{
if (obj->ops->destroy)
obj->ops->destroy(ctx, obj);
module_put(obj->ops->type->owner);
kfree(obj->key.name);
kfree(obj->udata);
kfree(obj);
}
static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_object *obj;
struct nft_ctx ctx;
u32 objtype;
if (!nla[NFTA_OBJ_TYPE] ||
(!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
}
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
if (nla[NFTA_OBJ_HANDLE]) {
attr = nla[NFTA_OBJ_HANDLE];
obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
} else {
attr = nla[NFTA_OBJ_NAME];
obj = nft_obj_lookup(net, table, attr, objtype, genmask);
}
if (IS_ERR(obj)) {
if (PTR_ERR(obj) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
return 0;
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(obj);
}
if (obj->use > 0) {
NL_SET_BAD_ATTR(extack, attr);
return -EBUSY;
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
return nft_delobj(&ctx, obj);
}
static void
__nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq, int event,
u16 flags, int family, int report, gfp_t gfp)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct sk_buff *skb;
int err;
if (!report &&
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
if (skb == NULL)
goto err;
err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
flags & (NLM_F_CREATE | NLM_F_EXCL),
family, table, obj, false);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_notify_enqueue(skb, report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
void nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq, int event,
u16 flags, int family, int report, gfp_t gfp)
{
char *buf = kasprintf(gfp, "%s:%u",
table->name, nft_base_seq(net));
audit_log_nfcfg(buf,
family,
obj->handle,
event == NFT_MSG_NEWOBJ ?
AUDIT_NFT_OP_OBJ_REGISTER :
AUDIT_NFT_OP_OBJ_UNREGISTER,
gfp);
kfree(buf);
__nft_obj_notify(net, table, obj, portid, seq, event,
flags, family, report, gfp);
}
EXPORT_SYMBOL_GPL(nft_obj_notify);
static void nf_tables_obj_notify(const struct nft_ctx *ctx,
struct nft_object *obj, int event)
{
__nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
ctx->seq, event, ctx->flags, ctx->family,
ctx->report, GFP_KERNEL);
}
void nft_register_flowtable_type(struct nf_flowtable_type *type)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_add_tail_rcu(&type->list, &nf_tables_flowtables);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
{
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_del_rcu(&type->list);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
[NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
.len = NFT_NAME_MAXLEN - 1 },
[NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
.len = NFT_NAME_MAXLEN - 1 },
[NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
[NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
[NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
};
struct nft_flowtable *nft_flowtable_lookup(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
struct nft_flowtable *flowtable;
list_for_each_entry_rcu(flowtable, &table->flowtables, list,
lockdep_commit_lock_is_held(net)) {
if (!nla_strcmp(nla, flowtable->name) &&
nft_active_genmask(flowtable, genmask))
return flowtable;
}
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
struct nft_flowtable *flowtable,
enum nft_trans_phase phase)
{
switch (phase) {
case NFT_TRANS_PREPARE_ERROR:
case NFT_TRANS_PREPARE:
case NFT_TRANS_ABORT:
case NFT_TRANS_RELEASE:
nft_use_dec(&flowtable->use);
fallthrough;
default:
return;
}
}
EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table *table,
const struct nlattr *nla, u8 genmask)
{
struct nft_flowtable *flowtable;
list_for_each_entry(flowtable, &table->flowtables, list) {
if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
nft_active_genmask(flowtable, genmask))
return flowtable;
}
return ERR_PTR(-ENOENT);
}
struct nft_flowtable_hook {
u32 num;
int priority;
struct list_head list;
};
static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
[NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
[NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
[NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
};
static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
const struct nlattr * const nla[],
struct nft_flowtable_hook *flowtable_hook,
struct nft_flowtable *flowtable,
struct netlink_ext_ack *extack, bool add)
{
struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
struct nf_hook_ops *ops;
struct nft_hook *hook;
int hooknum, priority;
int err;
INIT_LIST_HEAD(&flowtable_hook->list);
err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
nla[NFTA_FLOWTABLE_HOOK],
nft_flowtable_hook_policy, NULL);
if (err < 0)
return err;
if (add) {
if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
!tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
return -ENOENT;
}
hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
if (hooknum != NF_NETDEV_INGRESS)
return -EOPNOTSUPP;
priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
flowtable_hook->priority = priority;
flowtable_hook->num = hooknum;
} else {
if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
if (hooknum != flowtable->hooknum)
return -EOPNOTSUPP;
}
if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
if (priority != flowtable->data.priority)
return -EOPNOTSUPP;
}
flowtable_hook->priority = flowtable->data.priority;
flowtable_hook->num = flowtable->hooknum;
}
if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
err = nf_tables_parse_netdev_hooks(ctx->net,
tb[NFTA_FLOWTABLE_HOOK_DEVS],
&flowtable_hook->list,
extack);
if (err < 0)
return err;
}
list_for_each_entry(hook, &flowtable_hook->list, list) {
list_for_each_entry(ops, &hook->ops_list, list) {
ops->pf = NFPROTO_NETDEV;
ops->hooknum = flowtable_hook->num;
ops->priority = flowtable_hook->priority;
ops->priv = &flowtable->data;
ops->hook = flowtable->data.type->hook;
ops->hook_ops_type = NF_HOOK_OP_NFT_FT;
}
}
return err;
}
static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
{
const struct nf_flowtable_type *type;
list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
if (family == type->family)
return type;
}
return NULL;
}
static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net *net, u8 family)
{
const struct nf_flowtable_type *type;
rcu_read_lock();
type = __nft_flowtable_type_get(family);
if (type != NULL && try_module_get(type->owner)) {
rcu_read_unlock();
return type;
}
rcu_read_unlock();
lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
if (type == NULL) {
if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
return ERR_PTR(-EAGAIN);
}
#endif
return ERR_PTR(-ENOENT);
}
static void nft_unregister_flowtable_ops(struct net *net,
struct nft_flowtable *flowtable,
struct nf_hook_ops *ops)
{
nf_unregister_net_hook(net, ops);
flowtable->data.type->setup(&flowtable->data, ops->dev,
FLOW_BLOCK_UNBIND);
}
static void __nft_unregister_flowtable_net_hooks(struct net *net,
struct nft_flowtable *flowtable,
struct list_head *hook_list,
bool release_netdev)
{
struct nft_hook *hook, *next;
struct nf_hook_ops *ops;
list_for_each_entry_safe(hook, next, hook_list, list) {
list_for_each_entry(ops, &hook->ops_list, list)
nft_unregister_flowtable_ops(net, flowtable, ops);
if (release_netdev) {
list_del(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
}
}
static void nft_unregister_flowtable_net_hooks(struct net *net,
struct nft_flowtable *flowtable,
struct list_head *hook_list)
{
__nft_unregister_flowtable_net_hooks(net, flowtable, hook_list, false);
}
static int nft_register_flowtable_ops(struct net *net,
struct nft_flowtable *flowtable,
struct nf_hook_ops *ops)
{
int err;
err = flowtable->data.type->setup(&flowtable->data,
ops->dev, FLOW_BLOCK_BIND);
if (err < 0)
return err;
err = nf_register_net_hook(net, ops);
if (!err)
return 0;
flowtable->data.type->setup(&flowtable->data,
ops->dev, FLOW_BLOCK_UNBIND);
return err;
}
static int nft_register_flowtable_net_hooks(struct net *net,
struct nft_table *table,
struct list_head *hook_list,
struct nft_flowtable *flowtable)
{
struct nft_hook *hook, *next;
struct nft_flowtable *ft;
struct nf_hook_ops *ops;
int err, i = 0;
list_for_each_entry(hook, hook_list, list) {
list_for_each_entry(ft, &table->flowtables, list) {
if (!nft_is_active_next(net, ft))
continue;
if (nft_hook_list_find(&ft->hook_list, hook)) {
err = -EEXIST;
goto err_unregister_net_hooks;
}
}
list_for_each_entry(ops, &hook->ops_list, list) {
err = nft_register_flowtable_ops(net, flowtable, ops);
if (err < 0)
goto err_unregister_net_hooks;
i++;
}
}
return 0;
err_unregister_net_hooks:
list_for_each_entry_safe(hook, next, hook_list, list) {
list_for_each_entry(ops, &hook->ops_list, list) {
if (i-- <= 0)
break;
nft_unregister_flowtable_ops(net, flowtable, ops);
}
list_del_rcu(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
return err;
}
static void nft_hooks_destroy(struct list_head *hook_list)
{
struct nft_hook *hook, *next;
list_for_each_entry_safe(hook, next, hook_list, list) {
list_del_rcu(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
}
static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
struct nft_flowtable *flowtable,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_flowtable_hook flowtable_hook;
struct nftables_pernet *nft_net;
struct nft_hook *hook, *next;
struct nf_hook_ops *ops;
struct nft_trans *trans;
bool unregister = false;
u32 flags;
int err;
err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
extack, false);
if (err < 0)
return err;
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
if (nft_hook_list_find(&flowtable->hook_list, hook)) {
list_del(&hook->list);
nft_netdev_hook_free(hook);
continue;
}
nft_net = nft_pernet(ctx->net);
list_for_each_entry(trans, &nft_net->commit_list, list) {
if (trans->msg_type != NFT_MSG_NEWFLOWTABLE ||
trans->table != ctx->table ||
!nft_trans_flowtable_update(trans))
continue;
if (nft_hook_list_find(&nft_trans_flowtable_hooks(trans), hook)) {
err = -EEXIST;
goto err_flowtable_update_hook;
}
}
}
if (nla[NFTA_FLOWTABLE_FLAGS]) {
flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
if (flags & ~NFT_FLOWTABLE_MASK) {
err = -EOPNOTSUPP;
goto err_flowtable_update_hook;
}
if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
(flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
err = -EOPNOTSUPP;
goto err_flowtable_update_hook;
}
} else {
flags = flowtable->data.flags;
}
err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
&flowtable_hook.list, flowtable);
if (err < 0)
goto err_flowtable_update_hook;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
sizeof(struct nft_trans_flowtable));
if (!trans) {
unregister = true;
err = -ENOMEM;
goto err_flowtable_update_hook;
}
nft_trans_flowtable_flags(trans) = flags;
nft_trans_flowtable(trans) = flowtable;
nft_trans_flowtable_update(trans) = true;
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_flowtable_update_hook:
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
if (unregister) {
list_for_each_entry(ops, &hook->ops_list, list)
nft_unregister_flowtable_ops(ctx->net,
flowtable, ops);
}
list_del_rcu(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
return err;
}
static int nf_tables_newflowtable(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
struct nft_flowtable_hook flowtable_hook;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
const struct nf_flowtable_type *type;
struct nft_flowtable *flowtable;
struct net *net = info->net;
struct nft_table *table;
struct nft_trans *trans;
struct nft_ctx ctx;
int err;
if (!nla[NFTA_FLOWTABLE_TABLE] ||
!nla[NFTA_FLOWTABLE_NAME] ||
!nla[NFTA_FLOWTABLE_HOOK])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
}
flowtable = nft_flowtable_lookup(net, table, nla[NFTA_FLOWTABLE_NAME],
genmask);
if (IS_ERR(flowtable)) {
err = PTR_ERR(flowtable);
if (err != -ENOENT) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
return err;
}
} else {
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
return -EEXIST;
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
if (!nft_use_inc(&table->use))
return -EMFILE;
flowtable = kzalloc_obj(*flowtable, GFP_KERNEL_ACCOUNT);
if (!flowtable) {
err = -ENOMEM;
goto flowtable_alloc;
}
flowtable->table = table;
flowtable->handle = nf_tables_alloc_handle(table);
INIT_LIST_HEAD(&flowtable->hook_list);
flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
if (!flowtable->name) {
err = -ENOMEM;
goto err1;
}
type = nft_flowtable_type_get(net, family);
if (IS_ERR(type)) {
err = PTR_ERR(type);
goto err2;
}
if (nla[NFTA_FLOWTABLE_FLAGS]) {
flowtable->data.flags =
ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
err = -EOPNOTSUPP;
goto err3;
}
}
write_pnet(&flowtable->data.net, net);
flowtable->data.type = type;
err = type->init(&flowtable->data);
if (err < 0)
goto err3;
err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
extack, true);
if (err < 0)
goto err_flowtable_parse_hooks;
list_splice(&flowtable_hook.list, &flowtable->hook_list);
flowtable->data.priority = flowtable_hook.priority;
flowtable->hooknum = flowtable_hook.num;
trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto err_flowtable_trans;
}
err = nft_register_flowtable_net_hooks(ctx.net, table,
&flowtable->hook_list,
flowtable);
if (err < 0)
goto err_flowtable_hooks;
list_add_tail_rcu(&flowtable->list, &table->flowtables);
return 0;
err_flowtable_hooks:
synchronize_rcu();
nft_trans_destroy(trans);
err_flowtable_trans:
nft_hooks_destroy(&flowtable->hook_list);
err_flowtable_parse_hooks:
flowtable->data.type->free(&flowtable->data);
err3:
module_put(type->owner);
err2:
kfree(flowtable->name);
err1:
kfree(flowtable);
flowtable_alloc:
nft_use_dec_restore(&table->use);
return err;
}
static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
{
struct nft_hook *this, *next;
list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
list_del(&this->list);
nft_netdev_hook_free(this);
}
}
static int nft_delflowtable_hook(struct nft_ctx *ctx,
struct nft_flowtable *flowtable,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_flowtable_hook flowtable_hook;
LIST_HEAD(flowtable_del_list);
struct nft_hook *this, *hook;
struct nft_trans *trans;
int err;
err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
extack, false);
if (err < 0)
return err;
list_for_each_entry(this, &flowtable_hook.list, list) {
hook = nft_hook_list_find(&flowtable->hook_list, this);
if (!hook) {
err = -ENOENT;
goto err_flowtable_del_hook;
}
list_move(&hook->list, &flowtable_del_list);
}
trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
sizeof(struct nft_trans_flowtable));
if (!trans) {
err = -ENOMEM;
goto err_flowtable_del_hook;
}
nft_trans_flowtable(trans) = flowtable;
nft_trans_flowtable_update(trans) = true;
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
nft_flowtable_hook_release(&flowtable_hook);
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_flowtable_del_hook:
list_splice(&flowtable_del_list, &flowtable->hook_list);
nft_flowtable_hook_release(&flowtable_hook);
return err;
}
static int nf_tables_delflowtable(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_next(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_flowtable *flowtable;
struct net *net = info->net;
const struct nlattr *attr;
struct nft_table *table;
struct nft_ctx ctx;
if (!nla[NFTA_FLOWTABLE_TABLE] ||
(!nla[NFTA_FLOWTABLE_NAME] &&
!nla[NFTA_FLOWTABLE_HANDLE]))
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
}
if (nla[NFTA_FLOWTABLE_HANDLE]) {
attr = nla[NFTA_FLOWTABLE_HANDLE];
flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
} else {
attr = nla[NFTA_FLOWTABLE_NAME];
flowtable = nft_flowtable_lookup(net, table, attr, genmask);
}
if (IS_ERR(flowtable)) {
if (PTR_ERR(flowtable) == -ENOENT &&
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
return 0;
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(flowtable);
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
if (nla[NFTA_FLOWTABLE_HOOK])
return nft_delflowtable_hook(&ctx, flowtable, extack);
if (flowtable->use > 0) {
NL_SET_BAD_ATTR(extack, attr);
return -EBUSY;
}
return nft_delflowtable(&ctx, flowtable);
}
static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event,
u32 flags, int family,
struct nft_flowtable *flowtable,
struct list_head *hook_list)
{
struct nlattr *nest, *nest_devs;
struct nft_hook *hook;
struct nlmsghdr *nlh;
nlh = nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event),
flags, family, NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
NFTA_FLOWTABLE_PAD))
goto nla_put_failure;
if (!hook_list &&
(event == NFT_MSG_DELFLOWTABLE ||
event == NFT_MSG_DESTROYFLOWTABLE)) {
nlmsg_end(skb, nlh);
return 0;
}
if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
if (!nest)
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
goto nla_put_failure;
nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
if (!nest_devs)
goto nla_put_failure;
if (!hook_list)
hook_list = &flowtable->hook_list;
list_for_each_entry_rcu(hook, hook_list, list,
lockdep_commit_lock_is_held(net)) {
if (nft_nla_put_hook_dev(skb, hook))
goto nla_put_failure;
}
nla_nest_end(skb, nest_devs);
nla_nest_end(skb, nest);
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -1;
}
struct nft_flowtable_filter {
char *table;
};
static int nf_tables_dump_flowtable(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
struct nft_flowtable_filter *filter = cb->data;
unsigned int idx = 0, s_idx = cb->args[0];
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct nft_flowtable *flowtable;
struct nftables_pernet *nft_net;
const struct nft_table *table;
rcu_read_lock();
nft_net = nft_pernet(net);
cb->seq = nft_base_seq(net);
list_for_each_entry_rcu(table, &nft_net->tables, list) {
if (family != NFPROTO_UNSPEC && family != table->family)
continue;
list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
if (!nft_is_active(net, flowtable))
goto cont;
if (idx < s_idx)
goto cont;
if (idx > s_idx)
memset(&cb->args[1], 0,
sizeof(cb->args) - sizeof(cb->args[0]));
if (filter && filter->table &&
strcmp(filter->table, table->name))
goto cont;
if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWFLOWTABLE,
NLM_F_MULTI | NLM_F_APPEND,
table->family,
flowtable, NULL) < 0)
goto done;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
}
done:
rcu_read_unlock();
cb->args[0] = idx;
return skb->len;
}
static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
{
const struct nlattr * const *nla = cb->data;
struct nft_flowtable_filter *filter = NULL;
if (nla[NFTA_FLOWTABLE_TABLE]) {
filter = kzalloc_obj(*filter, GFP_ATOMIC);
if (!filter)
return -ENOMEM;
filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
GFP_ATOMIC);
if (!filter->table) {
kfree(filter);
return -ENOMEM;
}
}
cb->data = filter;
return 0;
}
static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
{
struct nft_flowtable_filter *filter = cb->data;
if (!filter)
return 0;
kfree(filter->table);
kfree(filter);
return 0;
}
static int nf_tables_getflowtable(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_flowtable *flowtable;
const struct nft_table *table;
struct net *net = info->net;
struct sk_buff *skb2;
int err;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = nf_tables_dump_flowtable_start,
.dump = nf_tables_dump_flowtable,
.done = nf_tables_dump_flowtable_done,
.module = THIS_MODULE,
.data = (void *)nla,
};
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (!nla[NFTA_FLOWTABLE_NAME])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
}
flowtable = nft_flowtable_lookup(net, table, nla[NFTA_FLOWTABLE_NAME],
genmask);
if (IS_ERR(flowtable)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
return PTR_ERR(flowtable);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq,
NFT_MSG_NEWFLOWTABLE, 0, family,
flowtable, NULL);
if (err < 0)
goto err_fill_flowtable_info;
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_flowtable_info:
kfree_skb(skb2);
return err;
}
static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
struct nft_flowtable *flowtable,
struct list_head *hook_list, int event)
{
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
struct sk_buff *skb;
u16 flags = 0;
int err;
if (!ctx->report &&
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
return;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
goto err;
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
ctx->seq, event, flags,
ctx->family, flowtable, hook_list);
if (err < 0) {
kfree_skb(skb);
goto err;
}
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
return;
err:
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
{
struct nft_hook *hook, *next;
flowtable->data.type->free(&flowtable->data);
list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
list_del_rcu(&hook->list);
nft_netdev_hook_free_rcu(hook);
}
kfree(flowtable->name);
module_put(flowtable->data.type->owner);
kfree(flowtable);
}
static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq)
{
struct nlmsghdr *nlh;
char buf[TASK_COMM_LEN];
int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
NFNETLINK_V0, nft_base_seq_be16(net));
if (!nlh)
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_base_seq(net))) ||
nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_trim(skb, nlh);
return -EMSGSIZE;
}
struct nf_hook_ops *nft_hook_find_ops(const struct nft_hook *hook,
const struct net_device *dev)
{
struct nf_hook_ops *ops;
list_for_each_entry(ops, &hook->ops_list, list) {
if (ops->dev == dev)
return ops;
}
return NULL;
}
EXPORT_SYMBOL_GPL(nft_hook_find_ops);
struct nf_hook_ops *nft_hook_find_ops_rcu(const struct nft_hook *hook,
const struct net_device *dev)
{
struct nf_hook_ops *ops;
list_for_each_entry_rcu(ops, &hook->ops_list, list) {
if (ops->dev == dev)
return ops;
}
return NULL;
}
EXPORT_SYMBOL_GPL(nft_hook_find_ops_rcu);
static int nft_flowtable_event(unsigned long event, struct net_device *dev,
struct nft_flowtable *flowtable, bool changename)
{
struct nf_hook_ops *ops;
struct nft_hook *hook;
bool match;
list_for_each_entry(hook, &flowtable->hook_list, list) {
ops = nft_hook_find_ops(hook, dev);
match = !strncmp(hook->ifname, dev->name, hook->ifnamelen);
switch (event) {
case NETDEV_UNREGISTER:
if (!ops || (changename && match))
continue;
nft_unregister_flowtable_ops(dev_net(dev),
flowtable, ops);
list_del_rcu(&ops->list);
kfree_rcu(ops, rcu);
break;
case NETDEV_REGISTER:
if (!match || ops)
continue;
ops = kzalloc_obj(struct nf_hook_ops,
GFP_KERNEL_ACCOUNT);
if (!ops)
return 1;
ops->pf = NFPROTO_NETDEV;
ops->hooknum = flowtable->hooknum;
ops->priority = flowtable->data.priority;
ops->priv = &flowtable->data;
ops->hook = flowtable->data.type->hook;
ops->hook_ops_type = NF_HOOK_OP_NFT_FT;
ops->dev = dev;
if (nft_register_flowtable_ops(dev_net(dev),
flowtable, ops)) {
kfree(ops);
return 1;
}
list_add_tail_rcu(&ops->list, &hook->ops_list);
break;
}
break;
}
return 0;
}
static int __nf_tables_flowtable_event(unsigned long event,
struct net_device *dev,
bool changename)
{
struct nftables_pernet *nft_net = nft_pernet(dev_net(dev));
struct nft_flowtable *flowtable;
struct nft_table *table;
list_for_each_entry(table, &nft_net->tables, list) {
list_for_each_entry(flowtable, &table->flowtables, list) {
if (nft_flowtable_event(event, dev,
flowtable, changename))
return 1;
}
}
return 0;
}
static int nf_tables_flowtable_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct nftables_pernet *nft_net;
int ret = NOTIFY_DONE;
struct net *net;
if (event != NETDEV_REGISTER &&
event != NETDEV_UNREGISTER &&
event != NETDEV_CHANGENAME)
return NOTIFY_DONE;
net = dev_net(dev);
nft_net = nft_pernet(net);
mutex_lock(&nft_net->commit_mutex);
if (event == NETDEV_CHANGENAME) {
if (__nf_tables_flowtable_event(NETDEV_REGISTER, dev, true)) {
ret = NOTIFY_BAD;
goto out_unlock;
}
__nf_tables_flowtable_event(NETDEV_UNREGISTER, dev, true);
} else if (__nf_tables_flowtable_event(event, dev, false)) {
ret = NOTIFY_BAD;
}
out_unlock:
mutex_unlock(&nft_net->commit_mutex);
return ret;
}
static struct notifier_block nf_tables_flowtable_notifier = {
.notifier_call = nf_tables_flowtable_event,
};
static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
int event)
{
struct nlmsghdr *nlh = nlmsg_hdr(skb);
struct sk_buff *skb2;
int err;
if (!nlmsg_report(nlh) &&
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
return;
skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb2 == NULL)
goto err;
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
nlh->nlmsg_seq);
if (err < 0) {
kfree_skb(skb2);
goto err;
}
nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
nlmsg_report(nlh), GFP_KERNEL);
return;
err:
nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
-ENOBUFS);
}
static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct sk_buff *skb2;
int err;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb2 == NULL)
return -ENOMEM;
err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq);
if (err < 0)
goto err_fill_gen_info;
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
err_fill_gen_info:
kfree_skb(skb2);
return err;
}
static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
[NFT_MSG_NEWTABLE] = {
.call = nf_tables_newtable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_TABLE_MAX,
.policy = nft_table_policy,
},
[NFT_MSG_GETTABLE] = {
.call = nf_tables_gettable,
.type = NFNL_CB_RCU,
.attr_count = NFTA_TABLE_MAX,
.policy = nft_table_policy,
},
[NFT_MSG_DELTABLE] = {
.call = nf_tables_deltable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_TABLE_MAX,
.policy = nft_table_policy,
},
[NFT_MSG_DESTROYTABLE] = {
.call = nf_tables_deltable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_TABLE_MAX,
.policy = nft_table_policy,
},
[NFT_MSG_NEWCHAIN] = {
.call = nf_tables_newchain,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_CHAIN_MAX,
.policy = nft_chain_policy,
},
[NFT_MSG_GETCHAIN] = {
.call = nf_tables_getchain,
.type = NFNL_CB_RCU,
.attr_count = NFTA_CHAIN_MAX,
.policy = nft_chain_policy,
},
[NFT_MSG_DELCHAIN] = {
.call = nf_tables_delchain,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_CHAIN_MAX,
.policy = nft_chain_policy,
},
[NFT_MSG_DESTROYCHAIN] = {
.call = nf_tables_delchain,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_CHAIN_MAX,
.policy = nft_chain_policy,
},
[NFT_MSG_NEWRULE] = {
.call = nf_tables_newrule,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
[NFT_MSG_GETRULE] = {
.call = nf_tables_getrule,
.type = NFNL_CB_RCU,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
[NFT_MSG_GETRULE_RESET] = {
.call = nf_tables_getrule,
.type = NFNL_CB_RCU,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
[NFT_MSG_DELRULE] = {
.call = nf_tables_delrule,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
[NFT_MSG_DESTROYRULE] = {
.call = nf_tables_delrule,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
[NFT_MSG_NEWSET] = {
.call = nf_tables_newset,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_MAX,
.policy = nft_set_policy,
},
[NFT_MSG_GETSET] = {
.call = nf_tables_getset,
.type = NFNL_CB_RCU,
.attr_count = NFTA_SET_MAX,
.policy = nft_set_policy,
},
[NFT_MSG_DELSET] = {
.call = nf_tables_delset,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_MAX,
.policy = nft_set_policy,
},
[NFT_MSG_DESTROYSET] = {
.call = nf_tables_delset,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_MAX,
.policy = nft_set_policy,
},
[NFT_MSG_NEWSETELEM] = {
.call = nf_tables_newsetelem,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_ELEM_LIST_MAX,
.policy = nft_set_elem_list_policy,
},
[NFT_MSG_GETSETELEM] = {
.call = nf_tables_getsetelem,
.type = NFNL_CB_RCU,
.attr_count = NFTA_SET_ELEM_LIST_MAX,
.policy = nft_set_elem_list_policy,
},
[NFT_MSG_GETSETELEM_RESET] = {
.call = nf_tables_getsetelem,
.type = NFNL_CB_RCU,
.attr_count = NFTA_SET_ELEM_LIST_MAX,
.policy = nft_set_elem_list_policy,
},
[NFT_MSG_DELSETELEM] = {
.call = nf_tables_delsetelem,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_ELEM_LIST_MAX,
.policy = nft_set_elem_list_policy,
},
[NFT_MSG_DESTROYSETELEM] = {
.call = nf_tables_delsetelem,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_SET_ELEM_LIST_MAX,
.policy = nft_set_elem_list_policy,
},
[NFT_MSG_GETGEN] = {
.call = nf_tables_getgen,
.type = NFNL_CB_RCU,
},
[NFT_MSG_NEWOBJ] = {
.call = nf_tables_newobj,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_OBJ_MAX,
.policy = nft_obj_policy,
},
[NFT_MSG_GETOBJ] = {
.call = nf_tables_getobj,
.type = NFNL_CB_RCU,
.attr_count = NFTA_OBJ_MAX,
.policy = nft_obj_policy,
},
[NFT_MSG_DELOBJ] = {
.call = nf_tables_delobj,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_OBJ_MAX,
.policy = nft_obj_policy,
},
[NFT_MSG_DESTROYOBJ] = {
.call = nf_tables_delobj,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_OBJ_MAX,
.policy = nft_obj_policy,
},
[NFT_MSG_GETOBJ_RESET] = {
.call = nf_tables_getobj,
.type = NFNL_CB_RCU,
.attr_count = NFTA_OBJ_MAX,
.policy = nft_obj_policy,
},
[NFT_MSG_NEWFLOWTABLE] = {
.call = nf_tables_newflowtable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_FLOWTABLE_MAX,
.policy = nft_flowtable_policy,
},
[NFT_MSG_GETFLOWTABLE] = {
.call = nf_tables_getflowtable,
.type = NFNL_CB_RCU,
.attr_count = NFTA_FLOWTABLE_MAX,
.policy = nft_flowtable_policy,
},
[NFT_MSG_DELFLOWTABLE] = {
.call = nf_tables_delflowtable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_FLOWTABLE_MAX,
.policy = nft_flowtable_policy,
},
[NFT_MSG_DESTROYFLOWTABLE] = {
.call = nf_tables_delflowtable,
.type = NFNL_CB_BATCH,
.attr_count = NFTA_FLOWTABLE_MAX,
.policy = nft_flowtable_policy,
},
};
static int nf_tables_validate(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_table *table;
list_for_each_entry(table, &nft_net->tables, list) {
switch (table->validate_state) {
case NFT_VALIDATE_SKIP:
continue;
case NFT_VALIDATE_NEED:
nft_validate_state_update(table, NFT_VALIDATE_DO);
fallthrough;
case NFT_VALIDATE_DO:
if (nft_table_validate(net, table) < 0)
return -EAGAIN;
nft_validate_state_update(table, NFT_VALIDATE_SKIP);
break;
}
}
return 0;
}
static void nft_chain_commit_drop_policy(struct nft_trans_chain *trans)
{
struct nft_base_chain *basechain;
if (trans->policy != NF_DROP)
return;
if (!nft_is_base_chain(trans->chain))
return;
basechain = nft_base_chain(trans->chain);
basechain->policy = NF_DROP;
}
static void nft_chain_commit_update(struct nft_trans_chain *trans)
{
struct nft_table *table = trans->nft_trans_binding.nft_trans.table;
struct nft_base_chain *basechain;
if (trans->name) {
rhltable_remove(&table->chains_ht,
&trans->chain->rhlhead,
nft_chain_ht_params);
swap(trans->chain->name, trans->name);
rhltable_insert_key(&table->chains_ht,
trans->chain->name,
&trans->chain->rhlhead,
nft_chain_ht_params);
}
if (!nft_is_base_chain(trans->chain))
return;
nft_chain_stats_replace(trans);
basechain = nft_base_chain(trans->chain);
switch (trans->policy) {
case NF_DROP:
case NF_ACCEPT:
basechain->policy = trans->policy;
break;
}
}
static void nft_obj_commit_update(const struct nft_ctx *ctx,
struct nft_trans *trans)
{
struct nft_object *newobj;
struct nft_object *obj;
obj = nft_trans_obj(trans);
newobj = nft_trans_obj_newobj(trans);
if (WARN_ON_ONCE(!obj->ops->update))
return;
obj->ops->update(obj, newobj);
nft_obj_destroy(ctx, newobj);
}
static void nft_commit_release(struct nft_trans *trans)
{
struct nft_ctx ctx = {
.net = trans->net,
};
nft_ctx_update(&ctx, trans);
switch (trans->msg_type) {
case NFT_MSG_DELTABLE:
case NFT_MSG_DESTROYTABLE:
nf_tables_table_destroy(trans->table);
break;
case NFT_MSG_NEWCHAIN:
free_percpu(nft_trans_chain_stats(trans));
kfree(nft_trans_chain_name(trans));
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans))
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
else
nf_tables_chain_destroy(nft_trans_chain(trans));
break;
case NFT_MSG_DELRULE:
case NFT_MSG_DESTROYRULE:
nf_tables_rule_destroy(&ctx, nft_trans_rule(trans));
break;
case NFT_MSG_DELSET:
case NFT_MSG_DESTROYSET:
nft_set_destroy(&ctx, nft_trans_set(trans));
break;
case NFT_MSG_DELSETELEM:
case NFT_MSG_DESTROYSETELEM:
nft_trans_elems_destroy(&ctx, nft_trans_container_elem(trans));
break;
case NFT_MSG_DELOBJ:
case NFT_MSG_DESTROYOBJ:
nft_obj_destroy(&ctx, nft_trans_obj(trans));
break;
case NFT_MSG_DELFLOWTABLE:
case NFT_MSG_DESTROYFLOWTABLE:
if (nft_trans_flowtable_update(trans))
nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
else
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
break;
}
if (trans->put_net)
put_net(trans->net);
kfree(trans);
}
static void nf_tables_trans_destroy_work(struct work_struct *w)
{
struct nftables_pernet *nft_net = container_of(w, struct nftables_pernet, destroy_work);
struct nft_trans *trans, *next;
LIST_HEAD(head);
spin_lock(&nf_tables_destroy_list_lock);
list_splice_init(&nft_net->destroy_list, &head);
spin_unlock(&nf_tables_destroy_list_lock);
if (list_empty(&head))
return;
synchronize_rcu();
list_for_each_entry_safe(trans, next, &head, list) {
nft_trans_list_del(trans);
nft_commit_release(trans);
}
}
void nf_tables_trans_destroy_flush_work(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
flush_work(&nft_net->destroy_work);
}
EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
static bool nft_expr_reduce(struct nft_regs_track *track,
const struct nft_expr *expr)
{
return false;
}
static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
{
const struct nft_expr *expr, *last;
struct nft_regs_track track = {};
unsigned int size, data_size;
void *data, *data_boundary;
struct nft_rule_dp *prule;
struct nft_rule *rule;
if (chain->blob_next || !nft_is_active_next(net, chain))
return 0;
data_size = 0;
list_for_each_entry(rule, &chain->rules, list) {
if (nft_is_active_next(net, rule)) {
data_size += sizeof(*prule) + rule->dlen;
if (data_size > INT_MAX)
return -ENOMEM;
}
}
chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
if (!chain->blob_next)
return -ENOMEM;
data = (void *)chain->blob_next->data;
data_boundary = data + data_size;
size = 0;
list_for_each_entry(rule, &chain->rules, list) {
if (!nft_is_active_next(net, rule))
continue;
prule = (struct nft_rule_dp *)data;
data += offsetof(struct nft_rule_dp, data);
if (WARN_ON_ONCE(data > data_boundary))
return -ENOMEM;
size = 0;
track.last = nft_expr_last(rule);
nft_rule_for_each_expr(expr, last, rule) {
track.cur = expr;
if (nft_expr_reduce(&track, expr)) {
expr = track.cur;
continue;
}
if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
return -ENOMEM;
memcpy(data + size, expr, expr->ops->size);
size += expr->ops->size;
}
if (WARN_ON_ONCE(size >= 1 << 12))
return -ENOMEM;
prule->handle = rule->handle;
prule->dlen = size;
prule->is_last = 0;
data += size;
size = 0;
chain->blob_next->size += (unsigned long)(data - (void *)prule);
}
if (WARN_ON_ONCE(data > data_boundary))
return -ENOMEM;
prule = (struct nft_rule_dp *)data;
nft_last_rule(chain, prule);
return 0;
}
static void nf_tables_commit_chain_prepare_cancel(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_trans *trans, *next;
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
if (trans->msg_type == NFT_MSG_NEWRULE ||
trans->msg_type == NFT_MSG_DELRULE) {
struct nft_chain *chain = nft_trans_rule_chain(trans);
kvfree(chain->blob_next);
chain->blob_next = NULL;
}
}
}
static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
{
struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
kvfree(l->blob);
}
static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
{
struct nft_rule_dp_last *last;
last = (void *)blob + sizeof(*blob) + blob->size;
last->blob = blob;
call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
}
static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
{
struct nft_rule_blob *g0, *g1;
bool next_genbit;
next_genbit = nft_gencursor_next(net);
g0 = rcu_dereference_protected(chain->blob_gen_0,
lockdep_commit_lock_is_held(net));
g1 = rcu_dereference_protected(chain->blob_gen_1,
lockdep_commit_lock_is_held(net));
if (chain->blob_next == NULL) {
if (g0 == g1)
return;
if (next_genbit) {
rcu_assign_pointer(chain->blob_gen_1, g0);
nf_tables_commit_chain_free_rules_old(g1);
} else {
rcu_assign_pointer(chain->blob_gen_0, g1);
nf_tables_commit_chain_free_rules_old(g0);
}
return;
}
if (next_genbit)
rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
else
rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
chain->blob_next = NULL;
if (g0 == g1)
return;
if (next_genbit)
nf_tables_commit_chain_free_rules_old(g1);
else
nf_tables_commit_chain_free_rules_old(g0);
}
static void nft_obj_del(struct nft_object *obj)
{
rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
list_del_rcu(&obj->list);
}
void nft_chain_del(struct nft_chain *chain)
{
struct nft_table *table = chain->table;
WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
nft_chain_ht_params));
list_del_rcu(&chain->list);
}
static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
struct nft_trans_gc *trans)
{
struct nft_elem_priv **priv = trans->priv;
unsigned int i;
for (i = 0; i < trans->count; i++) {
nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
nft_setelem_remove(ctx->net, trans->set, priv[i]);
}
}
void nft_trans_gc_destroy(struct nft_trans_gc *trans)
{
nft_set_put(trans->set);
put_net(trans->net);
kfree(trans);
}
static void nft_trans_gc_trans_free(struct rcu_head *rcu)
{
struct nft_elem_priv *elem_priv;
struct nft_trans_gc *trans;
struct nft_ctx ctx = {};
unsigned int i;
trans = container_of(rcu, struct nft_trans_gc, rcu);
ctx.net = read_pnet(&trans->set->net);
for (i = 0; i < trans->count; i++) {
elem_priv = trans->priv[i];
if (!nft_setelem_is_catchall(trans->set, elem_priv))
atomic_dec(&trans->set->nelems);
nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
}
nft_trans_gc_destroy(trans);
}
static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
{
struct nftables_pernet *nft_net;
struct nft_ctx ctx = {};
nft_net = nft_pernet(trans->net);
mutex_lock(&nft_net->commit_mutex);
if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
mutex_unlock(&nft_net->commit_mutex);
return false;
}
ctx.net = trans->net;
ctx.table = trans->set->table;
nft_trans_gc_setelem_remove(&ctx, trans);
mutex_unlock(&nft_net->commit_mutex);
return true;
}
static void nft_trans_gc_work(struct work_struct *work)
{
struct nft_trans_gc *trans, *next;
LIST_HEAD(trans_gc_list);
spin_lock(&nf_tables_gc_list_lock);
list_splice_init(&nf_tables_gc_list, &trans_gc_list);
spin_unlock(&nf_tables_gc_list_lock);
list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
list_del(&trans->list);
if (!nft_trans_gc_work_done(trans)) {
nft_trans_gc_destroy(trans);
continue;
}
call_rcu(&trans->rcu, nft_trans_gc_trans_free);
}
}
struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
unsigned int gc_seq, gfp_t gfp)
{
struct net *net = read_pnet(&set->net);
struct nft_trans_gc *trans;
trans = kzalloc_obj(*trans, gfp);
if (!trans)
return NULL;
trans->net = maybe_get_net(net);
if (!trans->net) {
kfree(trans);
return NULL;
}
refcount_inc(&set->refs);
trans->set = set;
trans->seq = gc_seq;
return trans;
}
void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
{
trans->priv[trans->count++] = priv;
}
static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
{
spin_lock(&nf_tables_gc_list_lock);
list_add_tail(&trans->list, &nf_tables_gc_list);
spin_unlock(&nf_tables_gc_list_lock);
schedule_work(&trans_gc_work);
}
struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
unsigned int gc_seq, gfp_t gfp)
{
struct nft_set *set;
if (nft_trans_gc_space(gc))
return gc;
set = gc->set;
nft_trans_gc_queue_work(gc);
return nft_trans_gc_alloc(set, gc_seq, gfp);
}
void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
{
if (trans->count == 0) {
nft_trans_gc_destroy(trans);
return;
}
nft_trans_gc_queue_work(trans);
}
struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
{
struct nft_set *set;
if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
return NULL;
if (nft_trans_gc_space(gc))
return gc;
set = gc->set;
call_rcu(&gc->rcu, nft_trans_gc_trans_free);
return nft_trans_gc_alloc(set, 0, gfp);
}
void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
{
WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
if (trans->count == 0) {
nft_trans_gc_destroy(trans);
return;
}
call_rcu(&trans->rcu, nft_trans_gc_trans_free);
}
struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
unsigned int gc_seq)
{
struct nft_set_elem_catchall *catchall;
const struct nft_set *set = gc->set;
struct nft_set_ext *ext;
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!nft_set_elem_expired(ext))
continue;
if (nft_set_elem_is_dead(ext))
goto dead_elem;
nft_set_elem_dead(ext);
dead_elem:
gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
if (!gc)
return NULL;
nft_trans_gc_elem_add(gc, catchall->elem);
}
return gc;
}
struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
{
struct nft_set_elem_catchall *catchall, *next;
u64 tstamp = nft_net_tstamp(gc->net);
const struct nft_set *set = gc->set;
struct nft_elem_priv *elem_priv;
struct nft_set_ext *ext;
WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
ext = nft_set_elem_ext(set, catchall->elem);
if (!__nft_set_elem_expired(ext, tstamp))
continue;
gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
if (!gc)
return NULL;
elem_priv = catchall->elem;
nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
nft_setelem_catchall_destroy(catchall);
nft_trans_gc_elem_add(gc, elem_priv);
}
return gc;
}
static void nf_tables_module_autoload_cleanup(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_module_request *req, *next;
WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
WARN_ON_ONCE(!req->done);
list_del(&req->list);
kfree(req);
}
}
static void nf_tables_commit_release(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_trans *trans;
if (list_empty(&nft_net->commit_list)) {
nf_tables_module_autoload_cleanup(net);
mutex_unlock(&nft_net->commit_mutex);
return;
}
trans = list_last_entry(&nft_net->commit_list,
struct nft_trans, list);
get_net(trans->net);
WARN_ON_ONCE(trans->put_net);
trans->put_net = true;
spin_lock(&nf_tables_destroy_list_lock);
list_splice_tail_init(&nft_net->commit_list, &nft_net->destroy_list);
spin_unlock(&nf_tables_destroy_list_lock);
nf_tables_module_autoload_cleanup(net);
schedule_work(&nft_net->destroy_work);
mutex_unlock(&nft_net->commit_mutex);
}
static void nft_commit_notify(struct net *net, u32 portid)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct sk_buff *batch_skb = NULL, *nskb, *skb;
unsigned char *data;
int len;
list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
if (!batch_skb) {
new_batch:
batch_skb = skb;
len = NLMSG_GOODSIZE - skb->len;
list_del(&skb->list);
continue;
}
len -= skb->len;
if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
data = skb_put(batch_skb, skb->len);
memcpy(data, skb->data, skb->len);
list_del(&skb->list);
kfree_skb(skb);
continue;
}
nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
NFT_CB(batch_skb).report, GFP_KERNEL);
goto new_batch;
}
if (batch_skb) {
nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
NFT_CB(batch_skb).report, GFP_KERNEL);
}
WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
}
static int nf_tables_commit_audit_alloc(struct list_head *adl,
struct nft_table *table)
{
struct nft_audit_data *adp;
list_for_each_entry(adp, adl, list) {
if (adp->table == table)
return 0;
}
adp = kzalloc_obj(*adp);
if (!adp)
return -ENOMEM;
adp->table = table;
list_add(&adp->list, adl);
return 0;
}
static void nf_tables_commit_audit_free(struct list_head *adl)
{
struct nft_audit_data *adp, *adn;
list_for_each_entry_safe(adp, adn, adl, list) {
list_del(&adp->list);
kfree(adp);
}
}
static unsigned int nf_tables_commit_audit_entrycount(const struct nft_trans *trans)
{
switch (trans->msg_type) {
case NFT_MSG_NEWSETELEM:
case NFT_MSG_DELSETELEM:
return nft_trans_container_elem(trans)->nelems;
}
return 1;
}
static void nf_tables_commit_audit_collect(struct list_head *adl,
const struct nft_trans *trans, u32 op)
{
const struct nft_table *table = trans->table;
struct nft_audit_data *adp;
list_for_each_entry(adp, adl, list) {
if (adp->table == table)
goto found;
}
WARN_ONCE(1, "table=%s not expected in commit list", table->name);
return;
found:
adp->entries += nf_tables_commit_audit_entrycount(trans);
if (!adp->op || adp->op > op)
adp->op = op;
}
#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
{
struct nft_audit_data *adp, *adn;
char aubuf[AUNFTABLENAMELEN];
list_for_each_entry_safe(adp, adn, adl, list) {
snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
generation);
audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
nft2audit_op[adp->op], GFP_KERNEL);
list_del(&adp->list);
kfree(adp);
}
}
static void nft_set_commit_update(struct list_head *set_update_list)
{
struct nft_set *set, *next;
list_for_each_entry_safe(set, next, set_update_list, pending_update) {
list_del_init(&set->pending_update);
if (!set->ops->commit || set->dead)
continue;
set->ops->commit(set);
}
}
static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
{
unsigned int gc_seq;
gc_seq = READ_ONCE(nft_net->gc_seq);
WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
return gc_seq;
}
static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
{
WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
}
static int nf_tables_commit(struct net *net, struct sk_buff *skb)
{
struct nftables_pernet *nft_net = nft_pernet(net);
const struct nlmsghdr *nlh = nlmsg_hdr(skb);
struct nft_trans_binding *trans_binding;
struct nft_trans *trans, *next;
unsigned int base_seq, gc_seq;
LIST_HEAD(set_update_list);
struct nft_trans_elem *te;
struct nft_chain *chain;
struct nft_table *table;
struct nft_ctx ctx;
LIST_HEAD(adl);
int err;
if (list_empty(&nft_net->commit_list)) {
mutex_unlock(&nft_net->commit_mutex);
return 0;
}
nft_ctx_init(&ctx, net, skb, nlh, NFPROTO_UNSPEC, NULL, NULL, NULL);
list_for_each_entry(trans_binding, &nft_net->binding_list, binding_list) {
trans = &trans_binding->nft_trans;
switch (trans->msg_type) {
case NFT_MSG_NEWSET:
if (!nft_trans_set_update(trans) &&
nft_set_is_anonymous(nft_trans_set(trans)) &&
!nft_trans_set_bound(trans)) {
pr_warn_once("nftables ruleset with unbound set\n");
return -EINVAL;
}
break;
case NFT_MSG_NEWCHAIN:
if (!nft_trans_chain_update(trans) &&
nft_chain_binding(nft_trans_chain(trans)) &&
!nft_trans_chain_bound(trans)) {
pr_warn_once("nftables ruleset with unbound chain\n");
return -EINVAL;
}
break;
default:
WARN_ONCE(1, "Unhandled bind type %d", trans->msg_type);
break;
}
}
if (nf_tables_validate(net) < 0) {
nft_net->validate_state = NFT_VALIDATE_DO;
return -EAGAIN;
}
err = nft_flow_rule_offload_commit(net);
if (err < 0)
return err;
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
struct nft_table *table = trans->table;
int ret;
ret = nf_tables_commit_audit_alloc(&adl, table);
if (ret) {
nf_tables_commit_chain_prepare_cancel(net);
nf_tables_commit_audit_free(&adl);
return ret;
}
if (trans->msg_type == NFT_MSG_NEWRULE ||
trans->msg_type == NFT_MSG_DELRULE) {
chain = nft_trans_rule_chain(trans);
ret = nf_tables_commit_chain_prepare(net, chain);
if (ret < 0) {
nf_tables_commit_chain_prepare_cancel(net);
nf_tables_commit_audit_free(&adl);
return ret;
}
}
}
list_for_each_entry(table, &nft_net->tables, list) {
list_for_each_entry(chain, &table->chains, list)
nf_tables_commit_chain(net, chain);
}
base_seq = nft_base_seq(net);
while (++base_seq == 0)
;
smp_store_release(&net->nft.base_seq, base_seq);
gc_seq = nft_gc_seq_begin(nft_net);
net->nft.gencursor = nft_gencursor_next(net);
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
struct nft_table *table = trans->table;
nft_ctx_update(&ctx, trans);
nf_tables_commit_audit_collect(&adl, trans, trans->msg_type);
switch (trans->msg_type) {
case NFT_MSG_NEWTABLE:
if (nft_trans_table_update(trans)) {
if (!(table->flags & __NFT_TABLE_F_UPDATE)) {
nft_trans_destroy(trans);
break;
}
if (table->flags & NFT_TABLE_F_DORMANT)
nf_tables_table_disable(net, table);
table->flags &= ~__NFT_TABLE_F_UPDATE;
} else {
nft_clear(net, table);
}
nf_tables_table_notify(&ctx, NFT_MSG_NEWTABLE);
nft_trans_destroy(trans);
break;
case NFT_MSG_DELTABLE:
case NFT_MSG_DESTROYTABLE:
list_del_rcu(&table->list);
nf_tables_table_notify(&ctx, trans->msg_type);
break;
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain_update(trans)) {
nft_chain_commit_update(nft_trans_container_chain(trans));
nf_tables_chain_notify(&ctx, NFT_MSG_NEWCHAIN,
&nft_trans_chain_hooks(trans));
list_splice(&nft_trans_chain_hooks(trans),
&nft_trans_basechain(trans)->hook_list);
} else {
nft_chain_commit_drop_policy(nft_trans_container_chain(trans));
nft_clear(net, nft_trans_chain(trans));
nf_tables_chain_notify(&ctx, NFT_MSG_NEWCHAIN, NULL);
nft_trans_destroy(trans);
}
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans)) {
nf_tables_chain_notify(&ctx, NFT_MSG_DELCHAIN,
&nft_trans_chain_hooks(trans));
if (!(table->flags & NFT_TABLE_F_DORMANT)) {
nft_netdev_unregister_hooks(net,
&nft_trans_chain_hooks(trans),
true);
}
} else {
nft_chain_del(nft_trans_chain(trans));
nf_tables_chain_notify(&ctx, NFT_MSG_DELCHAIN,
NULL);
nf_tables_unregister_hook(ctx.net, ctx.table,
nft_trans_chain(trans));
}
break;
case NFT_MSG_NEWRULE:
nft_clear(net, nft_trans_rule(trans));
nf_tables_rule_notify(&ctx, nft_trans_rule(trans),
NFT_MSG_NEWRULE);
if (nft_trans_rule_chain(trans)->flags & NFT_CHAIN_HW_OFFLOAD)
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
nft_trans_destroy(trans);
break;
case NFT_MSG_DELRULE:
case NFT_MSG_DESTROYRULE:
list_del_rcu(&nft_trans_rule(trans)->list);
nf_tables_rule_notify(&ctx, nft_trans_rule(trans),
trans->msg_type);
nft_rule_expr_deactivate(&ctx, nft_trans_rule(trans),
NFT_TRANS_COMMIT);
if (nft_trans_rule_chain(trans)->flags & NFT_CHAIN_HW_OFFLOAD)
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
break;
case NFT_MSG_NEWSET:
list_del(&nft_trans_container_set(trans)->list_trans_newset);
if (nft_trans_set_update(trans)) {
struct nft_set *set = nft_trans_set(trans);
WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
if (nft_trans_set_size(trans))
WRITE_ONCE(set->size, nft_trans_set_size(trans));
} else {
nft_clear(net, nft_trans_set(trans));
if (nft_set_is_anonymous(nft_trans_set(trans)) &&
!list_empty(&nft_trans_set(trans)->bindings))
nft_use_dec(&table->use);
}
nf_tables_set_notify(&ctx, nft_trans_set(trans),
NFT_MSG_NEWSET, GFP_KERNEL);
nft_trans_destroy(trans);
break;
case NFT_MSG_DELSET:
case NFT_MSG_DESTROYSET:
nft_trans_set(trans)->dead = 1;
list_del_rcu(&nft_trans_set(trans)->list);
nf_tables_set_notify(&ctx, nft_trans_set(trans),
trans->msg_type, GFP_KERNEL);
break;
case NFT_MSG_NEWSETELEM:
te = nft_trans_container_elem(trans);
nft_trans_elems_add(&ctx, te);
if (te->set->ops->commit &&
list_empty(&te->set->pending_update)) {
list_add_tail(&te->set->pending_update,
&set_update_list);
}
nft_trans_destroy(trans);
break;
case NFT_MSG_DELSETELEM:
case NFT_MSG_DESTROYSETELEM:
te = nft_trans_container_elem(trans);
nft_trans_elems_remove(&ctx, te);
if (te->set->ops->commit &&
list_empty(&te->set->pending_update)) {
list_add_tail(&te->set->pending_update,
&set_update_list);
}
break;
case NFT_MSG_NEWOBJ:
if (nft_trans_obj_update(trans)) {
nft_obj_commit_update(&ctx, trans);
nf_tables_obj_notify(&ctx,
nft_trans_obj(trans),
NFT_MSG_NEWOBJ);
} else {
nft_clear(net, nft_trans_obj(trans));
nf_tables_obj_notify(&ctx,
nft_trans_obj(trans),
NFT_MSG_NEWOBJ);
nft_trans_destroy(trans);
}
break;
case NFT_MSG_DELOBJ:
case NFT_MSG_DESTROYOBJ:
nft_obj_del(nft_trans_obj(trans));
nf_tables_obj_notify(&ctx, nft_trans_obj(trans),
trans->msg_type);
break;
case NFT_MSG_NEWFLOWTABLE:
if (nft_trans_flowtable_update(trans)) {
nft_trans_flowtable(trans)->data.flags =
nft_trans_flowtable_flags(trans);
nf_tables_flowtable_notify(&ctx,
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans),
NFT_MSG_NEWFLOWTABLE);
list_splice(&nft_trans_flowtable_hooks(trans),
&nft_trans_flowtable(trans)->hook_list);
} else {
nft_clear(net, nft_trans_flowtable(trans));
nf_tables_flowtable_notify(&ctx,
nft_trans_flowtable(trans),
NULL,
NFT_MSG_NEWFLOWTABLE);
}
nft_trans_destroy(trans);
break;
case NFT_MSG_DELFLOWTABLE:
case NFT_MSG_DESTROYFLOWTABLE:
if (nft_trans_flowtable_update(trans)) {
nf_tables_flowtable_notify(&ctx,
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans),
trans->msg_type);
nft_unregister_flowtable_net_hooks(net,
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans));
} else {
list_del_rcu(&nft_trans_flowtable(trans)->list);
nf_tables_flowtable_notify(&ctx,
nft_trans_flowtable(trans),
NULL,
trans->msg_type);
nft_unregister_flowtable_net_hooks(net,
nft_trans_flowtable(trans),
&nft_trans_flowtable(trans)->hook_list);
}
break;
}
}
nft_set_commit_update(&set_update_list);
nft_commit_notify(net, NETLINK_CB(skb).portid);
nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
nf_tables_commit_audit_log(&adl, nft_base_seq(net));
nft_gc_seq_end(nft_net, gc_seq);
nft_net->validate_state = NFT_VALIDATE_SKIP;
nf_tables_commit_release(net);
return 0;
}
static void nf_tables_module_autoload(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_module_request *req, *next;
LIST_HEAD(module_list);
list_splice_init(&nft_net->module_list, &module_list);
mutex_unlock(&nft_net->commit_mutex);
list_for_each_entry_safe(req, next, &module_list, list) {
request_module("%s", req->module);
req->done = true;
}
mutex_lock(&nft_net->commit_mutex);
list_splice(&module_list, &nft_net->module_list);
}
static void nf_tables_abort_release(struct nft_trans *trans)
{
struct nft_ctx ctx = { };
nft_ctx_update(&ctx, trans);
switch (trans->msg_type) {
case NFT_MSG_NEWTABLE:
nf_tables_table_destroy(trans->table);
break;
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain_update(trans))
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
else
nf_tables_chain_destroy(nft_trans_chain(trans));
break;
case NFT_MSG_NEWRULE:
nf_tables_rule_destroy(&ctx, nft_trans_rule(trans));
break;
case NFT_MSG_NEWSET:
nft_set_destroy(&ctx, nft_trans_set(trans));
break;
case NFT_MSG_NEWSETELEM:
nft_trans_set_elem_destroy(&ctx, nft_trans_container_elem(trans));
break;
case NFT_MSG_NEWOBJ:
nft_obj_destroy(&ctx, nft_trans_obj(trans));
break;
case NFT_MSG_NEWFLOWTABLE:
if (nft_trans_flowtable_update(trans))
nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
else
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
break;
}
kfree(trans);
}
static void nft_set_abort_update(struct list_head *set_update_list)
{
struct nft_set *set, *next;
list_for_each_entry_safe(set, next, set_update_list, pending_update) {
list_del_init(&set->pending_update);
if (!set->ops->abort)
continue;
set->ops->abort(set);
}
}
static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_trans *trans, *next;
LIST_HEAD(set_update_list);
struct nft_trans_elem *te;
struct nft_ctx ctx = {
.net = net,
};
int err = 0;
if (action == NFNL_ABORT_VALIDATE &&
nf_tables_validate(net) < 0)
err = -EAGAIN;
list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
list) {
struct nft_table *table = trans->table;
nft_ctx_update(&ctx, trans);
switch (trans->msg_type) {
case NFT_MSG_NEWTABLE:
if (nft_trans_table_update(trans)) {
if (!(table->flags & __NFT_TABLE_F_UPDATE)) {
nft_trans_destroy(trans);
break;
}
if (table->flags & __NFT_TABLE_F_WAS_DORMANT) {
nf_tables_table_disable(net, table);
table->flags |= NFT_TABLE_F_DORMANT;
} else if (table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
table->flags &= ~NFT_TABLE_F_DORMANT;
}
if (table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
table->flags &= ~NFT_TABLE_F_OWNER;
table->nlpid = 0;
}
table->flags &= ~__NFT_TABLE_F_UPDATE;
nft_trans_destroy(trans);
} else {
list_del_rcu(&table->list);
}
break;
case NFT_MSG_DELTABLE:
case NFT_MSG_DESTROYTABLE:
nft_clear(trans->net, table);
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain_update(trans)) {
if (!(table->flags & NFT_TABLE_F_DORMANT)) {
nft_netdev_unregister_hooks(net,
&nft_trans_chain_hooks(trans),
true);
}
free_percpu(nft_trans_chain_stats(trans));
kfree(nft_trans_chain_name(trans));
nft_trans_destroy(trans);
} else {
if (nft_trans_chain_bound(trans)) {
nft_trans_destroy(trans);
break;
}
nft_use_dec_restore(&table->use);
nft_chain_del(nft_trans_chain(trans));
nf_tables_unregister_hook(trans->net, table,
nft_trans_chain(trans));
}
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans)) {
list_splice(&nft_trans_chain_hooks(trans),
&nft_trans_basechain(trans)->hook_list);
} else {
nft_use_inc_restore(&table->use);
nft_clear(trans->net, nft_trans_chain(trans));
}
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWRULE:
if (nft_trans_rule_bound(trans)) {
nft_trans_destroy(trans);
break;
}
nft_use_dec_restore(&nft_trans_rule_chain(trans)->use);
list_del_rcu(&nft_trans_rule(trans)->list);
nft_rule_expr_deactivate(&ctx,
nft_trans_rule(trans),
NFT_TRANS_ABORT);
if (nft_trans_rule_chain(trans)->flags & NFT_CHAIN_HW_OFFLOAD)
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
break;
case NFT_MSG_DELRULE:
case NFT_MSG_DESTROYRULE:
nft_use_inc_restore(&nft_trans_rule_chain(trans)->use);
nft_clear(trans->net, nft_trans_rule(trans));
nft_rule_expr_activate(&ctx, nft_trans_rule(trans));
if (nft_trans_rule_chain(trans)->flags & NFT_CHAIN_HW_OFFLOAD)
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWSET:
list_del(&nft_trans_container_set(trans)->list_trans_newset);
if (nft_trans_set_update(trans)) {
nft_trans_destroy(trans);
break;
}
nft_use_dec_restore(&table->use);
if (nft_trans_set_bound(trans)) {
nft_trans_destroy(trans);
break;
}
nft_trans_set(trans)->dead = 1;
list_del_rcu(&nft_trans_set(trans)->list);
break;
case NFT_MSG_DELSET:
case NFT_MSG_DESTROYSET:
nft_use_inc_restore(&table->use);
nft_clear(trans->net, nft_trans_set(trans));
if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_activate(&ctx, nft_trans_set(trans));
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWSETELEM:
if (nft_trans_elem_set_bound(trans)) {
nft_trans_destroy(trans);
break;
}
te = nft_trans_container_elem(trans);
if (!nft_trans_elems_new_abort(&ctx, te)) {
nft_trans_destroy(trans);
break;
}
if (te->set->ops->abort &&
list_empty(&te->set->pending_update)) {
list_add_tail(&te->set->pending_update,
&set_update_list);
}
break;
case NFT_MSG_DELSETELEM:
case NFT_MSG_DESTROYSETELEM:
te = nft_trans_container_elem(trans);
nft_trans_elems_destroy_abort(&ctx, te);
if (te->set->ops->abort &&
list_empty(&te->set->pending_update)) {
list_add_tail(&te->set->pending_update,
&set_update_list);
}
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWOBJ:
if (nft_trans_obj_update(trans)) {
nft_obj_destroy(&ctx, nft_trans_obj_newobj(trans));
nft_trans_destroy(trans);
} else {
nft_use_dec_restore(&table->use);
nft_obj_del(nft_trans_obj(trans));
}
break;
case NFT_MSG_DELOBJ:
case NFT_MSG_DESTROYOBJ:
nft_use_inc_restore(&table->use);
nft_clear(trans->net, nft_trans_obj(trans));
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWFLOWTABLE:
if (nft_trans_flowtable_update(trans)) {
nft_unregister_flowtable_net_hooks(net,
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans));
} else {
nft_use_dec_restore(&table->use);
list_del_rcu(&nft_trans_flowtable(trans)->list);
nft_unregister_flowtable_net_hooks(net,
nft_trans_flowtable(trans),
&nft_trans_flowtable(trans)->hook_list);
}
break;
case NFT_MSG_DELFLOWTABLE:
case NFT_MSG_DESTROYFLOWTABLE:
if (nft_trans_flowtable_update(trans)) {
list_splice(&nft_trans_flowtable_hooks(trans),
&nft_trans_flowtable(trans)->hook_list);
} else {
nft_use_inc_restore(&table->use);
nft_clear(trans->net, nft_trans_flowtable(trans));
}
nft_trans_destroy(trans);
break;
}
}
WARN_ON_ONCE(!list_empty(&nft_net->commit_set_list));
nft_set_abort_update(&set_update_list);
synchronize_rcu();
list_for_each_entry_safe_reverse(trans, next,
&nft_net->commit_list, list) {
nft_trans_list_del(trans);
nf_tables_abort_release(trans);
}
return err;
}
static int nf_tables_abort(struct net *net, struct sk_buff *skb,
enum nfnl_abort_action action)
{
struct nftables_pernet *nft_net = nft_pernet(net);
unsigned int gc_seq;
int ret;
gc_seq = nft_gc_seq_begin(nft_net);
ret = __nf_tables_abort(net, action);
nft_gc_seq_end(nft_net, gc_seq);
if (action == NFNL_ABORT_NONE) {
struct nft_table *table;
list_for_each_entry(table, &nft_net->tables, list)
table->validate_state = NFT_VALIDATE_SKIP;
}
WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
if (action == NFNL_ABORT_AUTOLOAD)
nf_tables_module_autoload(net);
else
nf_tables_module_autoload_cleanup(net);
mutex_unlock(&nft_net->commit_mutex);
return ret;
}
static bool nf_tables_valid_genid(struct net *net, u32 genid)
{
struct nftables_pernet *nft_net = nft_pernet(net);
bool genid_ok;
mutex_lock(&nft_net->commit_mutex);
nft_net->tstamp = get_jiffies_64();
genid_ok = genid == 0 || nft_base_seq(net) == genid;
if (!genid_ok)
mutex_unlock(&nft_net->commit_mutex);
return genid_ok;
}
static const struct nfnetlink_subsystem nf_tables_subsys = {
.name = "nf_tables",
.subsys_id = NFNL_SUBSYS_NFTABLES,
.cb_count = NFT_MSG_MAX,
.cb = nf_tables_cb,
.commit = nf_tables_commit,
.abort = nf_tables_abort,
.valid_genid = nf_tables_valid_genid,
.owner = THIS_MODULE,
};
int nft_chain_validate_dependency(const struct nft_chain *chain,
enum nft_chain_types type)
{
const struct nft_base_chain *basechain;
if (nft_is_base_chain(chain)) {
basechain = nft_base_chain(chain);
if (basechain->type->type != type)
return -EOPNOTSUPP;
}
return 0;
}
EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
int nft_chain_validate_hooks(const struct nft_chain *chain,
unsigned int hook_flags)
{
struct nft_base_chain *basechain;
if (nft_is_base_chain(chain)) {
basechain = nft_base_chain(chain);
if ((1 << basechain->ops.hooknum) & hook_flags)
return 0;
return -EOPNOTSUPP;
}
return 0;
}
EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
{
u32 val;
val = ntohl(nla_get_be32(attr));
if (val > max)
return -ERANGE;
*dest = val;
return 0;
}
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
static int nft_parse_register(const struct nlattr *attr, u32 *preg)
{
unsigned int reg;
reg = ntohl(nla_get_be32(attr));
switch (reg) {
case NFT_REG_VERDICT...NFT_REG_4:
*preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
break;
case NFT_REG32_00...NFT_REG32_15:
*preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
break;
default:
return -ERANGE;
}
return 0;
}
int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
{
if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
else
reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
return nla_put_be32(skb, attr, htonl(reg));
}
EXPORT_SYMBOL_GPL(nft_dump_register);
static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
{
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
return -EINVAL;
if (len == 0)
return -EINVAL;
if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
return -ERANGE;
return 0;
}
int nft_parse_register_load(const struct nft_ctx *ctx,
const struct nlattr *attr, u8 *sreg, u32 len)
{
int err, invalid_reg;
u32 reg, next_register;
err = nft_parse_register(attr, ®);
if (err < 0)
return err;
err = nft_validate_register_load(reg, len);
if (err < 0)
return err;
next_register = DIV_ROUND_UP(len, NFT_REG32_SIZE) + reg;
if (WARN_ON_ONCE(next_register > NFT_REG32_NUM))
return -EINVAL;
invalid_reg = find_next_zero_bit(ctx->reg_inited, NFT_REG32_NUM, reg);
if (invalid_reg < next_register)
return -ENODATA;
*sreg = reg;
return 0;
}
EXPORT_SYMBOL_GPL(nft_parse_register_load);
static void nft_saw_register_store(const struct nft_ctx *__ctx,
int reg, unsigned int len)
{
unsigned int registers = DIV_ROUND_UP(len, NFT_REG32_SIZE);
struct nft_ctx *ctx = (struct nft_ctx *)__ctx;
if (WARN_ON_ONCE(len == 0 || reg < 0))
return;
bitmap_set(ctx->reg_inited, reg, registers);
}
static int nft_validate_register_store(const struct nft_ctx *ctx,
enum nft_registers reg,
const struct nft_data *data,
enum nft_data_types type,
unsigned int len)
{
switch (reg) {
case NFT_REG_VERDICT:
if (type != NFT_DATA_VERDICT)
return -EINVAL;
break;
default:
if (type != NFT_DATA_VALUE)
return -EINVAL;
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
return -EINVAL;
if (len == 0)
return -EINVAL;
if (reg * NFT_REG32_SIZE + len >
sizeof_field(struct nft_regs, data))
return -ERANGE;
break;
}
nft_saw_register_store(ctx, reg, len);
return 0;
}
int nft_parse_register_store(const struct nft_ctx *ctx,
const struct nlattr *attr, u8 *dreg,
const struct nft_data *data,
enum nft_data_types type, unsigned int len)
{
int err;
u32 reg;
err = nft_parse_register(attr, ®);
if (err < 0)
return err;
err = nft_validate_register_store(ctx, reg, data, type, len);
if (err < 0)
return err;
*dreg = reg;
return 0;
}
EXPORT_SYMBOL_GPL(nft_parse_register_store);
static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
[NFTA_VERDICT_CODE] = { .type = NLA_U32 },
[NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
};
static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
struct nft_data_desc *desc, const struct nlattr *nla)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nlattr *tb[NFTA_VERDICT_MAX + 1];
struct nft_chain *chain;
int err;
err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
nft_verdict_policy, NULL);
if (err < 0)
return err;
if (!tb[NFTA_VERDICT_CODE])
return -EINVAL;
memset(data, 0, sizeof(*data));
data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
switch (data->verdict.code) {
case NF_ACCEPT:
case NF_DROP:
case NFT_CONTINUE:
case NFT_BREAK:
case NFT_RETURN:
break;
case NFT_JUMP:
case NFT_GOTO:
if (tb[NFTA_VERDICT_CHAIN]) {
chain = nft_chain_lookup(ctx->net, ctx->table,
tb[NFTA_VERDICT_CHAIN],
genmask);
} else if (tb[NFTA_VERDICT_CHAIN_ID]) {
chain = nft_chain_lookup_byid(ctx->net, ctx->table,
tb[NFTA_VERDICT_CHAIN_ID],
genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
} else {
return -EINVAL;
}
if (IS_ERR(chain))
return PTR_ERR(chain);
if (nft_is_base_chain(chain))
return -EOPNOTSUPP;
if (nft_chain_is_bound(chain))
return -EINVAL;
if (desc->flags & NFT_DATA_DESC_SETELEM &&
chain->flags & NFT_CHAIN_BINDING)
return -EINVAL;
if (!nft_use_inc(&chain->use))
return -EMFILE;
data->verdict.chain = chain;
break;
case NF_QUEUE:
fallthrough;
default:
return -EINVAL;
}
desc->len = sizeof(data->verdict);
return 0;
}
static void nft_verdict_uninit(const struct nft_data *data)
{
struct nft_chain *chain;
switch (data->verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
chain = data->verdict.chain;
nft_use_dec(&chain->use);
break;
}
}
int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
{
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, type);
if (!nest)
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
goto nla_put_failure;
switch (v->code) {
case NFT_JUMP:
case NFT_GOTO:
if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
v->chain->name))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
return -1;
}
static int nft_value_init(const struct nft_ctx *ctx,
struct nft_data *data, struct nft_data_desc *desc,
const struct nlattr *nla)
{
unsigned int len;
len = nla_len(nla);
if (len == 0)
return -EINVAL;
if (len > desc->size)
return -EOVERFLOW;
if (desc->len) {
if (len != desc->len)
return -EINVAL;
} else {
desc->len = len;
}
nla_memcpy(data->data, nla, len);
return 0;
}
static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
unsigned int len)
{
return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
}
static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
[NFTA_DATA_VALUE] = { .type = NLA_BINARY },
[NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
};
int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
struct nft_data_desc *desc, const struct nlattr *nla)
{
struct nlattr *tb[NFTA_DATA_MAX + 1];
int err;
if (WARN_ON_ONCE(!desc->size))
return -EINVAL;
err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
nft_data_policy, NULL);
if (err < 0)
return err;
if (tb[NFTA_DATA_VALUE]) {
if (desc->type != NFT_DATA_VALUE)
return -EINVAL;
err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
} else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
if (desc->type != NFT_DATA_VERDICT)
return -EINVAL;
err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
} else {
err = -EINVAL;
}
return err;
}
EXPORT_SYMBOL_GPL(nft_data_init);
void nft_data_release(const struct nft_data *data, enum nft_data_types type)
{
if (type < NFT_DATA_VERDICT)
return;
switch (type) {
case NFT_DATA_VERDICT:
return nft_verdict_uninit(data);
default:
WARN_ON(1);
}
}
EXPORT_SYMBOL_GPL(nft_data_release);
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
enum nft_data_types type, unsigned int len)
{
struct nlattr *nest;
int err;
nest = nla_nest_start_noflag(skb, attr);
if (nest == NULL)
return -1;
switch (type) {
case NFT_DATA_VALUE:
err = nft_value_dump(skb, data, len);
break;
case NFT_DATA_VERDICT:
err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
break;
default:
err = -EINVAL;
WARN_ON(1);
}
nla_nest_end(skb, nest);
return err;
}
EXPORT_SYMBOL_GPL(nft_data_dump);
static void __nft_release_hook(struct net *net, struct nft_table *table)
{
struct nft_flowtable *flowtable;
struct nft_chain *chain;
list_for_each_entry(chain, &table->chains, list)
__nf_tables_unregister_hook(net, table, chain, true);
list_for_each_entry(flowtable, &table->flowtables, list)
__nft_unregister_flowtable_net_hooks(net, flowtable,
&flowtable->hook_list,
true);
}
static void __nft_release_hooks(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_table *table;
list_for_each_entry(table, &nft_net->tables, list) {
if (nft_table_has_owner(table))
continue;
__nft_release_hook(net, table);
}
}
static void __nft_release_table(struct net *net, struct nft_table *table)
{
struct nft_flowtable *flowtable, *nf;
struct nft_chain *chain, *nc;
struct nft_object *obj, *ne;
struct nft_rule *rule, *nr;
struct nft_set *set, *ns;
struct nft_ctx ctx = {
.net = net,
.family = NFPROTO_NETDEV,
};
ctx.family = table->family;
ctx.table = table;
list_for_each_entry(chain, &table->chains, list) {
if (nft_chain_binding(chain))
continue;
ctx.chain = chain;
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
list_del(&rule->list);
nft_use_dec(&chain->use);
nf_tables_rule_release(&ctx, rule);
}
}
list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
list_del(&flowtable->list);
nft_use_dec(&table->use);
nf_tables_flowtable_destroy(flowtable);
}
list_for_each_entry_safe(set, ns, &table->sets, list) {
list_del(&set->list);
nft_use_dec(&table->use);
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
nft_map_deactivate(&ctx, set);
nft_set_destroy(&ctx, set);
}
list_for_each_entry_safe(obj, ne, &table->objects, list) {
nft_obj_del(obj);
nft_use_dec(&table->use);
nft_obj_destroy(&ctx, obj);
}
list_for_each_entry_safe(chain, nc, &table->chains, list) {
nft_chain_del(chain);
nft_use_dec(&table->use);
nf_tables_chain_destroy(chain);
}
nf_tables_table_destroy(table);
}
static void __nft_release_tables(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nft_table *table, *nt;
list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
if (nft_table_has_owner(table))
continue;
list_del(&table->list);
__nft_release_table(net, table);
}
}
static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct nft_table *table, *to_delete[8];
struct nftables_pernet *nft_net;
struct netlink_notify *n = ptr;
struct net *net = n->net;
unsigned int deleted;
bool restart = false;
unsigned int gc_seq;
if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
return NOTIFY_DONE;
nft_net = nft_pernet(net);
deleted = 0;
mutex_lock(&nft_net->commit_mutex);
gc_seq = nft_gc_seq_begin(nft_net);
nf_tables_trans_destroy_flush_work(net);
again:
list_for_each_entry(table, &nft_net->tables, list) {
if (nft_table_has_owner(table) &&
n->portid == table->nlpid) {
if (table->flags & NFT_TABLE_F_PERSIST) {
table->flags &= ~NFT_TABLE_F_OWNER;
continue;
}
__nft_release_hook(net, table);
list_del_rcu(&table->list);
to_delete[deleted++] = table;
if (deleted >= ARRAY_SIZE(to_delete))
break;
}
}
if (deleted) {
restart = deleted >= ARRAY_SIZE(to_delete);
synchronize_rcu();
while (deleted)
__nft_release_table(net, to_delete[--deleted]);
if (restart)
goto again;
}
nft_gc_seq_end(nft_net, gc_seq);
mutex_unlock(&nft_net->commit_mutex);
return NOTIFY_DONE;
}
static struct notifier_block nft_nl_notifier = {
.notifier_call = nft_rcv_nl_event,
};
static int __net_init nf_tables_init_net(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
INIT_LIST_HEAD(&nft_net->tables);
INIT_LIST_HEAD(&nft_net->commit_list);
INIT_LIST_HEAD(&nft_net->destroy_list);
INIT_LIST_HEAD(&nft_net->commit_set_list);
INIT_LIST_HEAD(&nft_net->binding_list);
INIT_LIST_HEAD(&nft_net->module_list);
INIT_LIST_HEAD(&nft_net->notify_list);
mutex_init(&nft_net->commit_mutex);
net->nft.base_seq = 1;
nft_net->gc_seq = 0;
nft_net->validate_state = NFT_VALIDATE_SKIP;
INIT_WORK(&nft_net->destroy_work, nf_tables_trans_destroy_work);
return 0;
}
static void __net_exit nf_tables_pre_exit_net(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
mutex_lock(&nft_net->commit_mutex);
__nft_release_hooks(net);
mutex_unlock(&nft_net->commit_mutex);
}
static void __net_exit nf_tables_exit_net(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
unsigned int gc_seq;
mutex_lock(&nft_net->commit_mutex);
gc_seq = nft_gc_seq_begin(nft_net);
WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
WARN_ON_ONCE(!list_empty(&nft_net->commit_set_list));
if (!list_empty(&nft_net->module_list))
nf_tables_module_autoload_cleanup(net);
cancel_work_sync(&nft_net->destroy_work);
__nft_release_tables(net);
nft_gc_seq_end(nft_net, gc_seq);
mutex_unlock(&nft_net->commit_mutex);
WARN_ON_ONCE(!list_empty(&nft_net->tables));
WARN_ON_ONCE(!list_empty(&nft_net->module_list));
WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
WARN_ON_ONCE(!list_empty(&nft_net->destroy_list));
}
static void nf_tables_exit_batch(struct list_head *net_exit_list)
{
flush_work(&trans_gc_work);
}
static struct pernet_operations nf_tables_net_ops = {
.init = nf_tables_init_net,
.pre_exit = nf_tables_pre_exit_net,
.exit = nf_tables_exit_net,
.exit_batch = nf_tables_exit_batch,
.id = &nf_tables_net_id,
.size = sizeof(struct nftables_pernet),
};
static int __init nf_tables_module_init(void)
{
int err;
BUILD_BUG_ON(offsetof(struct nft_trans_table, nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_chain, nft_trans_binding.nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_rule, nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_set, nft_trans_binding.nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_elem, nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_obj, nft_trans) != 0);
BUILD_BUG_ON(offsetof(struct nft_trans_flowtable, nft_trans) != 0);
err = register_pernet_subsys(&nf_tables_net_ops);
if (err < 0)
return err;
err = nft_chain_filter_init();
if (err < 0)
goto err_chain_filter;
err = nf_tables_core_module_init();
if (err < 0)
goto err_core_module;
err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
if (err < 0)
goto err_netdev_notifier;
err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
if (err < 0)
goto err_rht_objname;
err = nft_offload_init();
if (err < 0)
goto err_offload;
err = netlink_register_notifier(&nft_nl_notifier);
if (err < 0)
goto err_netlink_notifier;
err = nfnetlink_subsys_register(&nf_tables_subsys);
if (err < 0)
goto err_nfnl_subsys;
nft_chain_route_init();
return err;
err_nfnl_subsys:
netlink_unregister_notifier(&nft_nl_notifier);
err_netlink_notifier:
nft_offload_exit();
err_offload:
rhltable_destroy(&nft_objname_ht);
err_rht_objname:
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
err_netdev_notifier:
nf_tables_core_module_exit();
err_core_module:
nft_chain_filter_fini();
err_chain_filter:
unregister_pernet_subsys(&nf_tables_net_ops);
return err;
}
static void __exit nf_tables_module_exit(void)
{
nfnetlink_subsys_unregister(&nf_tables_subsys);
netlink_unregister_notifier(&nft_nl_notifier);
nft_offload_exit();
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
nft_chain_filter_fini();
nft_chain_route_fini();
unregister_pernet_subsys(&nf_tables_net_ops);
cancel_work_sync(&trans_gc_work);
rcu_barrier();
rhltable_destroy(&nft_objname_ht);
nf_tables_core_module_exit();
}
module_init(nf_tables_module_init);
module_exit(nf_tables_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_DESCRIPTION("Framework for packet filtering and classification");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
