#include <linux/if_bridge.h>
#include <linux/in.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/rhashtable.h>
#include <linux/rhashtable-types.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <net/netlink.h>
#include <net/vxlan.h>
#include "vxlan_private.h"
struct vxlan_mdb_entry_key {
union vxlan_addr src;
union vxlan_addr dst;
__be32 vni;
};
struct vxlan_mdb_entry {
struct rhash_head rhnode;
struct list_head remotes;
struct vxlan_mdb_entry_key key;
struct hlist_node mdb_node;
struct rcu_head rcu;
};
#define VXLAN_MDB_REMOTE_F_BLOCKED BIT(0)
struct vxlan_mdb_remote {
struct list_head list;
struct vxlan_rdst __rcu *rd;
u8 flags;
u8 filter_mode;
u8 rt_protocol;
struct hlist_head src_list;
struct rcu_head rcu;
};
#define VXLAN_SGRP_F_DELETE BIT(0)
struct vxlan_mdb_src_entry {
struct hlist_node node;
union vxlan_addr addr;
u8 flags;
};
struct vxlan_mdb_dump_ctx {
long reserved;
long entry_idx;
long remote_idx;
};
struct vxlan_mdb_config_src_entry {
union vxlan_addr addr;
struct list_head node;
};
struct vxlan_mdb_config {
struct vxlan_dev *vxlan;
struct vxlan_mdb_entry_key group;
struct list_head src_list;
union vxlan_addr remote_ip;
u32 remote_ifindex;
__be32 remote_vni;
__be16 remote_port;
u16 nlflags;
u8 flags;
u8 filter_mode;
u8 rt_protocol;
};
struct vxlan_mdb_flush_desc {
union vxlan_addr remote_ip;
__be32 src_vni;
__be32 remote_vni;
__be16 remote_port;
u8 rt_protocol;
};
static const struct rhashtable_params vxlan_mdb_rht_params = {
.head_offset = offsetof(struct vxlan_mdb_entry, rhnode),
.key_offset = offsetof(struct vxlan_mdb_entry, key),
.key_len = sizeof(struct vxlan_mdb_entry_key),
.automatic_shrinking = true,
};
static int __vxlan_mdb_add(const struct vxlan_mdb_config *cfg,
struct netlink_ext_ack *extack);
static int __vxlan_mdb_del(const struct vxlan_mdb_config *cfg,
struct netlink_ext_ack *extack);
static void vxlan_br_mdb_entry_fill(const struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote,
struct br_mdb_entry *e)
{
const union vxlan_addr *dst = &mdb_entry->key.dst;
memset(e, 0, sizeof(*e));
e->ifindex = vxlan->dev->ifindex;
e->state = MDB_PERMANENT;
if (remote->flags & VXLAN_MDB_REMOTE_F_BLOCKED)
e->flags |= MDB_FLAGS_BLOCKED;
switch (dst->sa.sa_family) {
case AF_INET:
e->addr.u.ip4 = dst->sin.sin_addr.s_addr;
e->addr.proto = htons(ETH_P_IP);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
e->addr.u.ip6 = dst->sin6.sin6_addr;
e->addr.proto = htons(ETH_P_IPV6);
break;
#endif
}
}
static int vxlan_mdb_entry_info_fill_srcs(struct sk_buff *skb,
const struct vxlan_mdb_remote *remote)
{
struct vxlan_mdb_src_entry *ent;
struct nlattr *nest;
if (hlist_empty(&remote->src_list))
return 0;
nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
if (!nest)
return -EMSGSIZE;
hlist_for_each_entry(ent, &remote->src_list, node) {
struct nlattr *nest_ent;
nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
if (!nest_ent)
goto out_cancel_err;
if (vxlan_nla_put_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
&ent->addr) ||
nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER, 0))
goto out_cancel_err;
nla_nest_end(skb, nest_ent);
}
nla_nest_end(skb, nest);
return 0;
out_cancel_err:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int vxlan_mdb_entry_info_fill(const struct vxlan_dev *vxlan,
struct sk_buff *skb,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote)
{
struct vxlan_rdst *rd = rtnl_dereference(remote->rd);
struct br_mdb_entry e;
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY_INFO);
if (!nest)
return -EMSGSIZE;
vxlan_br_mdb_entry_fill(vxlan, mdb_entry, remote, &e);
if (nla_put_nohdr(skb, sizeof(e), &e) ||
nla_put_u32(skb, MDBA_MDB_EATTR_TIMER, 0))
goto nest_err;
if (!vxlan_addr_any(&mdb_entry->key.src) &&
vxlan_nla_put_addr(skb, MDBA_MDB_EATTR_SOURCE, &mdb_entry->key.src))
goto nest_err;
if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, remote->rt_protocol) ||
nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE, remote->filter_mode) ||
vxlan_mdb_entry_info_fill_srcs(skb, remote) ||
vxlan_nla_put_addr(skb, MDBA_MDB_EATTR_DST, &rd->remote_ip))
goto nest_err;
if (rd->remote_port && rd->remote_port != vxlan->cfg.dst_port &&
nla_put_u16(skb, MDBA_MDB_EATTR_DST_PORT,
be16_to_cpu(rd->remote_port)))
goto nest_err;
if (rd->remote_vni != vxlan->default_dst.remote_vni &&
nla_put_u32(skb, MDBA_MDB_EATTR_VNI, be32_to_cpu(rd->remote_vni)))
goto nest_err;
if (rd->remote_ifindex &&
nla_put_u32(skb, MDBA_MDB_EATTR_IFINDEX, rd->remote_ifindex))
goto nest_err;
if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) &&
mdb_entry->key.vni && nla_put_u32(skb, MDBA_MDB_EATTR_SRC_VNI,
be32_to_cpu(mdb_entry->key.vni)))
goto nest_err;
nla_nest_end(skb, nest);
return 0;
nest_err:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int vxlan_mdb_entry_fill(const struct vxlan_dev *vxlan,
struct sk_buff *skb,
struct vxlan_mdb_dump_ctx *ctx,
const struct vxlan_mdb_entry *mdb_entry)
{
int remote_idx = 0, s_remote_idx = ctx->remote_idx;
struct vxlan_mdb_remote *remote;
struct nlattr *nest;
int err = 0;
nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
if (!nest)
return -EMSGSIZE;
list_for_each_entry(remote, &mdb_entry->remotes, list) {
if (remote_idx < s_remote_idx)
goto skip;
err = vxlan_mdb_entry_info_fill(vxlan, skb, mdb_entry, remote);
if (err)
break;
skip:
remote_idx++;
}
ctx->remote_idx = err ? remote_idx : 0;
nla_nest_end(skb, nest);
return err;
}
static int vxlan_mdb_fill(const struct vxlan_dev *vxlan, struct sk_buff *skb,
struct vxlan_mdb_dump_ctx *ctx)
{
int entry_idx = 0, s_entry_idx = ctx->entry_idx;
struct vxlan_mdb_entry *mdb_entry;
struct nlattr *nest;
int err = 0;
nest = nla_nest_start_noflag(skb, MDBA_MDB);
if (!nest)
return -EMSGSIZE;
hlist_for_each_entry(mdb_entry, &vxlan->mdb_list, mdb_node) {
if (entry_idx < s_entry_idx)
goto skip;
err = vxlan_mdb_entry_fill(vxlan, skb, ctx, mdb_entry);
if (err)
break;
skip:
entry_idx++;
}
ctx->entry_idx = err ? entry_idx : 0;
nla_nest_end(skb, nest);
return err;
}
int vxlan_mdb_dump(struct net_device *dev, struct sk_buff *skb,
struct netlink_callback *cb)
{
struct vxlan_mdb_dump_ctx *ctx = (void *)cb->ctx;
struct vxlan_dev *vxlan = netdev_priv(dev);
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
int err;
ASSERT_RTNL();
NL_ASSERT_CTX_FITS(struct vxlan_mdb_dump_ctx);
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_NEWMDB, sizeof(*bpm),
NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->family = AF_BRIDGE;
bpm->ifindex = dev->ifindex;
err = vxlan_mdb_fill(vxlan, skb, ctx);
nlmsg_end(skb, nlh);
cb->seq = vxlan->mdb_seq;
nl_dump_check_consistent(cb, nlh);
return err;
}
static const struct nla_policy
vxlan_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = {
[MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
};
static const struct nla_policy
vxlan_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = {
[MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(vxlan_mdbe_src_list_entry_pol),
};
static const struct netlink_range_validation vni_range = {
.max = VXLAN_N_VID - 1,
};
static const struct nla_policy vxlan_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
[MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
[MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE,
MCAST_INCLUDE),
[MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(vxlan_mdbe_src_list_pol),
[MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
[MDBE_ATTR_DST] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
[MDBE_ATTR_DST_PORT] = { .type = NLA_U16 },
[MDBE_ATTR_VNI] = NLA_POLICY_FULL_RANGE(NLA_U32, &vni_range),
[MDBE_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1),
[MDBE_ATTR_SRC_VNI] = NLA_POLICY_FULL_RANGE(NLA_U32, &vni_range),
};
static bool vxlan_mdb_is_valid_source(const struct nlattr *attr, __be16 proto,
struct netlink_ext_ack *extack)
{
switch (proto) {
case htons(ETH_P_IP):
if (nla_len(attr) != sizeof(struct in_addr)) {
NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length");
return false;
}
if (ipv4_is_multicast(nla_get_in_addr(attr))) {
NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed");
return false;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6): {
struct in6_addr src;
if (nla_len(attr) != sizeof(struct in6_addr)) {
NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length");
return false;
}
src = nla_get_in6_addr(attr);
if (ipv6_addr_is_multicast(&src)) {
NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed");
return false;
}
break;
}
#endif
default:
NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address");
return false;
}
return true;
}
static void vxlan_mdb_group_set(struct vxlan_mdb_entry_key *group,
const struct br_mdb_entry *entry,
const struct nlattr *source_attr)
{
switch (entry->addr.proto) {
case htons(ETH_P_IP):
group->dst.sa.sa_family = AF_INET;
group->dst.sin.sin_addr.s_addr = entry->addr.u.ip4;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
group->dst.sa.sa_family = AF_INET6;
group->dst.sin6.sin6_addr = entry->addr.u.ip6;
break;
#endif
}
if (source_attr)
vxlan_nla_get_addr(&group->src, source_attr);
}
static bool vxlan_mdb_is_star_g(const struct vxlan_mdb_entry_key *group)
{
return !vxlan_addr_any(&group->dst) && vxlan_addr_any(&group->src);
}
static bool vxlan_mdb_is_sg(const struct vxlan_mdb_entry_key *group)
{
return !vxlan_addr_any(&group->dst) && !vxlan_addr_any(&group->src);
}
static int vxlan_mdb_config_src_entry_init(struct vxlan_mdb_config *cfg,
__be16 proto,
const struct nlattr *src_entry,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[MDBE_SRCATTR_MAX + 1];
struct vxlan_mdb_config_src_entry *src;
int err;
err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry,
vxlan_mdbe_src_list_entry_pol, extack);
if (err)
return err;
if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS))
return -EINVAL;
if (!vxlan_mdb_is_valid_source(tb[MDBE_SRCATTR_ADDRESS], proto,
extack))
return -EINVAL;
src = kzalloc_obj(*src);
if (!src)
return -ENOMEM;
err = vxlan_nla_get_addr(&src->addr, tb[MDBE_SRCATTR_ADDRESS]);
if (err)
goto err_free_src;
list_add_tail(&src->node, &cfg->src_list);
return 0;
err_free_src:
kfree(src);
return err;
}
static void
vxlan_mdb_config_src_entry_fini(struct vxlan_mdb_config_src_entry *src)
{
list_del(&src->node);
kfree(src);
}
static int vxlan_mdb_config_src_list_init(struct vxlan_mdb_config *cfg,
__be16 proto,
const struct nlattr *src_list,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_config_src_entry *src, *tmp;
struct nlattr *src_entry;
int rem, err;
nla_for_each_nested(src_entry, src_list, rem) {
err = vxlan_mdb_config_src_entry_init(cfg, proto, src_entry,
extack);
if (err)
goto err_src_entry_init;
}
return 0;
err_src_entry_init:
list_for_each_entry_safe_reverse(src, tmp, &cfg->src_list, node)
vxlan_mdb_config_src_entry_fini(src);
return err;
}
static void vxlan_mdb_config_src_list_fini(struct vxlan_mdb_config *cfg)
{
struct vxlan_mdb_config_src_entry *src, *tmp;
list_for_each_entry_safe_reverse(src, tmp, &cfg->src_list, node)
vxlan_mdb_config_src_entry_fini(src);
}
static int vxlan_mdb_config_attrs_init(struct vxlan_mdb_config *cfg,
const struct br_mdb_entry *entry,
const struct nlattr *set_attrs,
struct netlink_ext_ack *extack)
{
struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
int err;
err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX, set_attrs,
vxlan_mdbe_attrs_pol, extack);
if (err)
return err;
if (NL_REQ_ATTR_CHECK(extack, set_attrs, mdbe_attrs, MDBE_ATTR_DST)) {
NL_SET_ERR_MSG_MOD(extack, "Missing remote destination IP address");
return -EINVAL;
}
if (mdbe_attrs[MDBE_ATTR_SOURCE] &&
!vxlan_mdb_is_valid_source(mdbe_attrs[MDBE_ATTR_SOURCE],
entry->addr.proto, extack))
return -EINVAL;
vxlan_mdb_group_set(&cfg->group, entry, mdbe_attrs[MDBE_ATTR_SOURCE]);
if (!vxlan_addr_is_multicast(&cfg->group.dst) &&
!vxlan_addr_any(&cfg->group.dst)) {
NL_SET_ERR_MSG_MOD(extack, "Group address is not multicast");
return -EINVAL;
}
if (vxlan_addr_any(&cfg->group.dst) &&
mdbe_attrs[MDBE_ATTR_SOURCE]) {
NL_SET_ERR_MSG_MOD(extack, "Source cannot be specified for the all-zeros entry");
return -EINVAL;
}
if (vxlan_mdb_is_sg(&cfg->group))
cfg->filter_mode = MCAST_INCLUDE;
if (mdbe_attrs[MDBE_ATTR_GROUP_MODE]) {
if (!vxlan_mdb_is_star_g(&cfg->group)) {
NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries");
return -EINVAL;
}
cfg->filter_mode = nla_get_u8(mdbe_attrs[MDBE_ATTR_GROUP_MODE]);
}
if (mdbe_attrs[MDBE_ATTR_SRC_LIST]) {
if (!vxlan_mdb_is_star_g(&cfg->group)) {
NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries");
return -EINVAL;
}
if (!mdbe_attrs[MDBE_ATTR_GROUP_MODE]) {
NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode");
return -EINVAL;
}
err = vxlan_mdb_config_src_list_init(cfg, entry->addr.proto,
mdbe_attrs[MDBE_ATTR_SRC_LIST],
extack);
if (err)
return err;
}
if (vxlan_mdb_is_star_g(&cfg->group) && list_empty(&cfg->src_list) &&
cfg->filter_mode == MCAST_INCLUDE) {
NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list");
return -EINVAL;
}
if (mdbe_attrs[MDBE_ATTR_RTPROT])
cfg->rt_protocol = nla_get_u8(mdbe_attrs[MDBE_ATTR_RTPROT]);
err = vxlan_nla_get_addr(&cfg->remote_ip, mdbe_attrs[MDBE_ATTR_DST]);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Invalid remote destination address");
goto err_src_list_fini;
}
if (mdbe_attrs[MDBE_ATTR_DST_PORT])
cfg->remote_port =
cpu_to_be16(nla_get_u16(mdbe_attrs[MDBE_ATTR_DST_PORT]));
if (mdbe_attrs[MDBE_ATTR_VNI])
cfg->remote_vni =
cpu_to_be32(nla_get_u32(mdbe_attrs[MDBE_ATTR_VNI]));
if (mdbe_attrs[MDBE_ATTR_IFINDEX]) {
cfg->remote_ifindex =
nla_get_s32(mdbe_attrs[MDBE_ATTR_IFINDEX]);
if (!__dev_get_by_index(cfg->vxlan->net, cfg->remote_ifindex)) {
NL_SET_ERR_MSG_MOD(extack, "Outgoing interface not found");
err = -EINVAL;
goto err_src_list_fini;
}
}
if (mdbe_attrs[MDBE_ATTR_SRC_VNI])
cfg->group.vni =
cpu_to_be32(nla_get_u32(mdbe_attrs[MDBE_ATTR_SRC_VNI]));
return 0;
err_src_list_fini:
vxlan_mdb_config_src_list_fini(cfg);
return err;
}
static int vxlan_mdb_config_init(struct vxlan_mdb_config *cfg,
struct net_device *dev, struct nlattr *tb[],
u16 nlmsg_flags,
struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = nla_data(tb[MDBA_SET_ENTRY]);
struct vxlan_dev *vxlan = netdev_priv(dev);
memset(cfg, 0, sizeof(*cfg));
cfg->vxlan = vxlan;
cfg->group.vni = vxlan->default_dst.remote_vni;
INIT_LIST_HEAD(&cfg->src_list);
cfg->nlflags = nlmsg_flags;
cfg->filter_mode = MCAST_EXCLUDE;
cfg->rt_protocol = RTPROT_STATIC;
cfg->remote_vni = vxlan->default_dst.remote_vni;
cfg->remote_port = vxlan->cfg.dst_port;
if (entry->ifindex != dev->ifindex) {
NL_SET_ERR_MSG_MOD(extack, "Port net device must be the VXLAN net device");
return -EINVAL;
}
if ((nlmsg_flags & (NLM_F_CREATE | NLM_F_REPLACE)) &&
entry->state != MDB_PERMANENT) {
NL_SET_ERR_MSG_MOD(extack, "MDB entry must be permanent");
return -EINVAL;
}
if (entry->flags) {
NL_SET_ERR_MSG_MOD(extack, "Invalid MDB entry flags");
return -EINVAL;
}
if (entry->vid) {
NL_SET_ERR_MSG_MOD(extack, "VID must not be specified");
return -EINVAL;
}
if (entry->addr.proto != htons(ETH_P_IP) &&
entry->addr.proto != htons(ETH_P_IPV6)) {
NL_SET_ERR_MSG_MOD(extack, "Group address must be an IPv4 / IPv6 address");
return -EINVAL;
}
if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY_ATTRS)) {
NL_SET_ERR_MSG_MOD(extack, "Missing MDBA_SET_ENTRY_ATTRS attribute");
return -EINVAL;
}
return vxlan_mdb_config_attrs_init(cfg, entry, tb[MDBA_SET_ENTRY_ATTRS],
extack);
}
static void vxlan_mdb_config_fini(struct vxlan_mdb_config *cfg)
{
vxlan_mdb_config_src_list_fini(cfg);
}
static struct vxlan_mdb_entry *
vxlan_mdb_entry_lookup(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry_key *group)
{
return rhashtable_lookup_fast(&vxlan->mdb_tbl, group,
vxlan_mdb_rht_params);
}
static struct vxlan_mdb_remote *
vxlan_mdb_remote_lookup(const struct vxlan_mdb_entry *mdb_entry,
const union vxlan_addr *addr)
{
struct vxlan_mdb_remote *remote;
list_for_each_entry(remote, &mdb_entry->remotes, list) {
struct vxlan_rdst *rd = rtnl_dereference(remote->rd);
if (vxlan_addr_equal(addr, &rd->remote_ip))
return remote;
}
return NULL;
}
static void vxlan_mdb_rdst_free(struct rcu_head *head)
{
struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
dst_cache_destroy(&rd->dst_cache);
kfree(rd);
}
static int vxlan_mdb_remote_rdst_init(const struct vxlan_mdb_config *cfg,
struct vxlan_mdb_remote *remote)
{
struct vxlan_rdst *rd;
int err;
rd = kzalloc_obj(*rd);
if (!rd)
return -ENOMEM;
err = dst_cache_init(&rd->dst_cache, GFP_KERNEL);
if (err)
goto err_free_rdst;
rd->remote_ip = cfg->remote_ip;
rd->remote_port = cfg->remote_port;
rd->remote_vni = cfg->remote_vni;
rd->remote_ifindex = cfg->remote_ifindex;
rcu_assign_pointer(remote->rd, rd);
return 0;
err_free_rdst:
kfree(rd);
return err;
}
static void vxlan_mdb_remote_rdst_fini(struct vxlan_rdst *rd)
{
call_rcu(&rd->rcu, vxlan_mdb_rdst_free);
}
static int vxlan_mdb_remote_init(const struct vxlan_mdb_config *cfg,
struct vxlan_mdb_remote *remote)
{
int err;
err = vxlan_mdb_remote_rdst_init(cfg, remote);
if (err)
return err;
remote->flags = cfg->flags;
remote->filter_mode = cfg->filter_mode;
remote->rt_protocol = cfg->rt_protocol;
INIT_HLIST_HEAD(&remote->src_list);
return 0;
}
static void vxlan_mdb_remote_fini(struct vxlan_dev *vxlan,
struct vxlan_mdb_remote *remote)
{
WARN_ON_ONCE(!hlist_empty(&remote->src_list));
vxlan_mdb_remote_rdst_fini(rtnl_dereference(remote->rd));
}
static struct vxlan_mdb_src_entry *
vxlan_mdb_remote_src_entry_lookup(const struct vxlan_mdb_remote *remote,
const union vxlan_addr *addr)
{
struct vxlan_mdb_src_entry *ent;
hlist_for_each_entry(ent, &remote->src_list, node) {
if (vxlan_addr_equal(&ent->addr, addr))
return ent;
}
return NULL;
}
static struct vxlan_mdb_src_entry *
vxlan_mdb_remote_src_entry_add(struct vxlan_mdb_remote *remote,
const union vxlan_addr *addr)
{
struct vxlan_mdb_src_entry *ent;
ent = kzalloc_obj(*ent);
if (!ent)
return NULL;
ent->addr = *addr;
hlist_add_head(&ent->node, &remote->src_list);
return ent;
}
static void
vxlan_mdb_remote_src_entry_del(struct vxlan_mdb_src_entry *ent)
{
hlist_del(&ent->node);
kfree(ent);
}
static int
vxlan_mdb_remote_src_fwd_add(const struct vxlan_mdb_config *cfg,
const union vxlan_addr *addr,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_config sg_cfg;
memset(&sg_cfg, 0, sizeof(sg_cfg));
sg_cfg.vxlan = cfg->vxlan;
sg_cfg.group.src = *addr;
sg_cfg.group.dst = cfg->group.dst;
sg_cfg.group.vni = cfg->group.vni;
INIT_LIST_HEAD(&sg_cfg.src_list);
sg_cfg.remote_ip = cfg->remote_ip;
sg_cfg.remote_ifindex = cfg->remote_ifindex;
sg_cfg.remote_vni = cfg->remote_vni;
sg_cfg.remote_port = cfg->remote_port;
sg_cfg.nlflags = cfg->nlflags;
sg_cfg.filter_mode = MCAST_INCLUDE;
if (cfg->filter_mode == MCAST_EXCLUDE)
sg_cfg.flags = VXLAN_MDB_REMOTE_F_BLOCKED;
sg_cfg.rt_protocol = cfg->rt_protocol;
return __vxlan_mdb_add(&sg_cfg, extack);
}
static void
vxlan_mdb_remote_src_fwd_del(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry_key *group,
const struct vxlan_mdb_remote *remote,
const union vxlan_addr *addr)
{
struct vxlan_rdst *rd = rtnl_dereference(remote->rd);
struct vxlan_mdb_config sg_cfg;
memset(&sg_cfg, 0, sizeof(sg_cfg));
sg_cfg.vxlan = vxlan;
sg_cfg.group.src = *addr;
sg_cfg.group.dst = group->dst;
sg_cfg.group.vni = group->vni;
INIT_LIST_HEAD(&sg_cfg.src_list);
sg_cfg.remote_ip = rd->remote_ip;
__vxlan_mdb_del(&sg_cfg, NULL);
}
static int
vxlan_mdb_remote_src_add(const struct vxlan_mdb_config *cfg,
struct vxlan_mdb_remote *remote,
const struct vxlan_mdb_config_src_entry *src,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_src_entry *ent;
int err;
ent = vxlan_mdb_remote_src_entry_lookup(remote, &src->addr);
if (!ent) {
ent = vxlan_mdb_remote_src_entry_add(remote, &src->addr);
if (!ent)
return -ENOMEM;
} else if (!(cfg->nlflags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG_MOD(extack, "Source entry already exists");
return -EEXIST;
}
err = vxlan_mdb_remote_src_fwd_add(cfg, &ent->addr, extack);
if (err)
goto err_src_del;
ent->flags = 0;
return 0;
err_src_del:
vxlan_mdb_remote_src_entry_del(ent);
return err;
}
static void vxlan_mdb_remote_src_del(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry_key *group,
const struct vxlan_mdb_remote *remote,
struct vxlan_mdb_src_entry *ent)
{
vxlan_mdb_remote_src_fwd_del(vxlan, group, remote, &ent->addr);
vxlan_mdb_remote_src_entry_del(ent);
}
static int vxlan_mdb_remote_srcs_add(const struct vxlan_mdb_config *cfg,
struct vxlan_mdb_remote *remote,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_config_src_entry *src;
struct vxlan_mdb_src_entry *ent;
struct hlist_node *tmp;
int err;
list_for_each_entry(src, &cfg->src_list, node) {
err = vxlan_mdb_remote_src_add(cfg, remote, src, extack);
if (err)
goto err_src_del;
}
return 0;
err_src_del:
hlist_for_each_entry_safe(ent, tmp, &remote->src_list, node)
vxlan_mdb_remote_src_del(cfg->vxlan, &cfg->group, remote, ent);
return err;
}
static void vxlan_mdb_remote_srcs_del(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry_key *group,
struct vxlan_mdb_remote *remote)
{
struct vxlan_mdb_src_entry *ent;
struct hlist_node *tmp;
hlist_for_each_entry_safe(ent, tmp, &remote->src_list, node)
vxlan_mdb_remote_src_del(vxlan, group, remote, ent);
}
static size_t
vxlan_mdb_nlmsg_src_list_size(const struct vxlan_mdb_entry_key *group,
const struct vxlan_mdb_remote *remote)
{
struct vxlan_mdb_src_entry *ent;
size_t nlmsg_size;
if (hlist_empty(&remote->src_list))
return 0;
nlmsg_size = nla_total_size(0);
hlist_for_each_entry(ent, &remote->src_list, node) {
nlmsg_size += nla_total_size(0) +
nla_total_size(vxlan_addr_size(&group->dst)) +
nla_total_size(sizeof(u8));
}
return nlmsg_size;
}
static size_t
vxlan_mdb_nlmsg_remote_size(const struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote)
{
const struct vxlan_mdb_entry_key *group = &mdb_entry->key;
struct vxlan_rdst *rd = rtnl_dereference(remote->rd);
size_t nlmsg_size;
nlmsg_size = nla_total_size(sizeof(struct br_mdb_entry)) +
nla_total_size(sizeof(u32));
if (vxlan_mdb_is_sg(group))
nlmsg_size += nla_total_size(vxlan_addr_size(&group->dst));
nlmsg_size += nla_total_size(sizeof(u8));
nlmsg_size += vxlan_mdb_nlmsg_src_list_size(group, remote);
nlmsg_size += nla_total_size(sizeof(u8));
nlmsg_size += nla_total_size(vxlan_addr_size(&rd->remote_ip));
if (rd->remote_port && rd->remote_port != vxlan->cfg.dst_port)
nlmsg_size += nla_total_size(sizeof(u16));
if (rd->remote_vni != vxlan->default_dst.remote_vni)
nlmsg_size += nla_total_size(sizeof(u32));
if (rd->remote_ifindex)
nlmsg_size += nla_total_size(sizeof(u32));
if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && group->vni)
nlmsg_size += nla_total_size(sizeof(u32));
return nlmsg_size;
}
static size_t vxlan_mdb_nlmsg_size(const struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote)
{
return NLMSG_ALIGN(sizeof(struct br_port_msg)) +
nla_total_size(0) +
nla_total_size(0) +
vxlan_mdb_nlmsg_remote_size(vxlan, mdb_entry, remote);
}
static int vxlan_mdb_nlmsg_fill(const struct vxlan_dev *vxlan,
struct sk_buff *skb,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote,
int type)
{
struct nlattr *mdb_nest, *mdb_entry_nest;
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->family = AF_BRIDGE;
bpm->ifindex = vxlan->dev->ifindex;
mdb_nest = nla_nest_start_noflag(skb, MDBA_MDB);
if (!mdb_nest)
goto cancel;
mdb_entry_nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
if (!mdb_entry_nest)
goto cancel;
if (vxlan_mdb_entry_info_fill(vxlan, skb, mdb_entry, remote))
goto cancel;
nla_nest_end(skb, mdb_entry_nest);
nla_nest_end(skb, mdb_nest);
nlmsg_end(skb, nlh);
return 0;
cancel:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static void vxlan_mdb_remote_notify(const struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_remote *remote,
int type)
{
struct net *net = dev_net(vxlan->dev);
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(vxlan_mdb_nlmsg_size(vxlan, mdb_entry, remote),
GFP_KERNEL);
if (!skb)
goto errout;
err = vxlan_mdb_nlmsg_fill(vxlan, skb, mdb_entry, remote, type);
if (err) {
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_KERNEL);
return;
errout:
rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}
static int
vxlan_mdb_remote_srcs_replace(const struct vxlan_mdb_config *cfg,
const struct vxlan_mdb_entry *mdb_entry,
struct vxlan_mdb_remote *remote,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = cfg->vxlan;
struct vxlan_mdb_src_entry *ent;
struct hlist_node *tmp;
int err;
hlist_for_each_entry(ent, &remote->src_list, node)
ent->flags |= VXLAN_SGRP_F_DELETE;
err = vxlan_mdb_remote_srcs_add(cfg, remote, extack);
if (err)
goto err_clear_delete;
hlist_for_each_entry_safe(ent, tmp, &remote->src_list, node) {
if (ent->flags & VXLAN_SGRP_F_DELETE)
vxlan_mdb_remote_src_del(vxlan, &mdb_entry->key, remote,
ent);
}
return 0;
err_clear_delete:
hlist_for_each_entry(ent, &remote->src_list, node)
ent->flags &= ~VXLAN_SGRP_F_DELETE;
return err;
}
static int vxlan_mdb_remote_replace(const struct vxlan_mdb_config *cfg,
const struct vxlan_mdb_entry *mdb_entry,
struct vxlan_mdb_remote *remote,
struct netlink_ext_ack *extack)
{
struct vxlan_rdst *new_rd, *old_rd = rtnl_dereference(remote->rd);
struct vxlan_dev *vxlan = cfg->vxlan;
int err;
err = vxlan_mdb_remote_rdst_init(cfg, remote);
if (err)
return err;
new_rd = rtnl_dereference(remote->rd);
err = vxlan_mdb_remote_srcs_replace(cfg, mdb_entry, remote, extack);
if (err)
goto err_rdst_reset;
WRITE_ONCE(remote->flags, cfg->flags);
WRITE_ONCE(remote->filter_mode, cfg->filter_mode);
remote->rt_protocol = cfg->rt_protocol;
vxlan_mdb_remote_notify(vxlan, mdb_entry, remote, RTM_NEWMDB);
vxlan_mdb_remote_rdst_fini(old_rd);
return 0;
err_rdst_reset:
rcu_assign_pointer(remote->rd, old_rd);
vxlan_mdb_remote_rdst_fini(new_rd);
return err;
}
static int vxlan_mdb_remote_add(const struct vxlan_mdb_config *cfg,
struct vxlan_mdb_entry *mdb_entry,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_remote *remote;
int err;
remote = vxlan_mdb_remote_lookup(mdb_entry, &cfg->remote_ip);
if (remote) {
if (!(cfg->nlflags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG_MOD(extack, "Replace not specified and MDB remote entry already exists");
return -EEXIST;
}
return vxlan_mdb_remote_replace(cfg, mdb_entry, remote, extack);
}
if (!(cfg->nlflags & NLM_F_CREATE)) {
NL_SET_ERR_MSG_MOD(extack, "Create not specified and entry does not exist");
return -ENOENT;
}
remote = kzalloc_obj(*remote);
if (!remote)
return -ENOMEM;
err = vxlan_mdb_remote_init(cfg, remote);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to initialize remote MDB entry");
goto err_free_remote;
}
err = vxlan_mdb_remote_srcs_add(cfg, remote, extack);
if (err)
goto err_remote_fini;
list_add_rcu(&remote->list, &mdb_entry->remotes);
vxlan_mdb_remote_notify(cfg->vxlan, mdb_entry, remote, RTM_NEWMDB);
return 0;
err_remote_fini:
vxlan_mdb_remote_fini(cfg->vxlan, remote);
err_free_remote:
kfree(remote);
return err;
}
static void vxlan_mdb_remote_del(struct vxlan_dev *vxlan,
struct vxlan_mdb_entry *mdb_entry,
struct vxlan_mdb_remote *remote)
{
vxlan_mdb_remote_notify(vxlan, mdb_entry, remote, RTM_DELMDB);
list_del_rcu(&remote->list);
vxlan_mdb_remote_srcs_del(vxlan, &mdb_entry->key, remote);
vxlan_mdb_remote_fini(vxlan, remote);
kfree_rcu(remote, rcu);
}
static struct vxlan_mdb_entry *
vxlan_mdb_entry_get(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry_key *group)
{
struct vxlan_mdb_entry *mdb_entry;
int err;
mdb_entry = vxlan_mdb_entry_lookup(vxlan, group);
if (mdb_entry)
return mdb_entry;
mdb_entry = kzalloc_obj(*mdb_entry);
if (!mdb_entry)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&mdb_entry->remotes);
memcpy(&mdb_entry->key, group, sizeof(mdb_entry->key));
hlist_add_head(&mdb_entry->mdb_node, &vxlan->mdb_list);
err = rhashtable_lookup_insert_fast(&vxlan->mdb_tbl,
&mdb_entry->rhnode,
vxlan_mdb_rht_params);
if (err)
goto err_free_entry;
if (hlist_is_singular_node(&mdb_entry->mdb_node, &vxlan->mdb_list))
vxlan->cfg.flags |= VXLAN_F_MDB;
return mdb_entry;
err_free_entry:
hlist_del(&mdb_entry->mdb_node);
kfree(mdb_entry);
return ERR_PTR(err);
}
static void vxlan_mdb_entry_put(struct vxlan_dev *vxlan,
struct vxlan_mdb_entry *mdb_entry)
{
if (!list_empty(&mdb_entry->remotes))
return;
if (hlist_is_singular_node(&mdb_entry->mdb_node, &vxlan->mdb_list))
vxlan->cfg.flags &= ~VXLAN_F_MDB;
rhashtable_remove_fast(&vxlan->mdb_tbl, &mdb_entry->rhnode,
vxlan_mdb_rht_params);
hlist_del(&mdb_entry->mdb_node);
kfree_rcu(mdb_entry, rcu);
}
static int __vxlan_mdb_add(const struct vxlan_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = cfg->vxlan;
struct vxlan_mdb_entry *mdb_entry;
int err;
mdb_entry = vxlan_mdb_entry_get(vxlan, &cfg->group);
if (IS_ERR(mdb_entry))
return PTR_ERR(mdb_entry);
err = vxlan_mdb_remote_add(cfg, mdb_entry, extack);
if (err)
goto err_entry_put;
vxlan->mdb_seq++;
return 0;
err_entry_put:
vxlan_mdb_entry_put(vxlan, mdb_entry);
return err;
}
static int __vxlan_mdb_del(const struct vxlan_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = cfg->vxlan;
struct vxlan_mdb_entry *mdb_entry;
struct vxlan_mdb_remote *remote;
mdb_entry = vxlan_mdb_entry_lookup(vxlan, &cfg->group);
if (!mdb_entry) {
NL_SET_ERR_MSG_MOD(extack, "Did not find MDB entry");
return -ENOENT;
}
remote = vxlan_mdb_remote_lookup(mdb_entry, &cfg->remote_ip);
if (!remote) {
NL_SET_ERR_MSG_MOD(extack, "Did not find MDB remote entry");
return -ENOENT;
}
vxlan_mdb_remote_del(vxlan, mdb_entry, remote);
vxlan_mdb_entry_put(vxlan, mdb_entry);
vxlan->mdb_seq++;
return 0;
}
int vxlan_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags,
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_config cfg;
int err;
ASSERT_RTNL();
err = vxlan_mdb_config_init(&cfg, dev, tb, nlmsg_flags, extack);
if (err)
return err;
err = __vxlan_mdb_add(&cfg, extack);
vxlan_mdb_config_fini(&cfg);
return err;
}
int vxlan_mdb_del(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct vxlan_mdb_config cfg;
int err;
ASSERT_RTNL();
err = vxlan_mdb_config_init(&cfg, dev, tb, 0, extack);
if (err)
return err;
err = __vxlan_mdb_del(&cfg, extack);
vxlan_mdb_config_fini(&cfg);
return err;
}
static const struct nla_policy
vxlan_mdbe_attrs_del_bulk_pol[MDBE_ATTR_MAX + 1] = {
[MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
[MDBE_ATTR_DST] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
[MDBE_ATTR_DST_PORT] = { .type = NLA_U16 },
[MDBE_ATTR_VNI] = NLA_POLICY_FULL_RANGE(NLA_U32, &vni_range),
[MDBE_ATTR_SRC_VNI] = NLA_POLICY_FULL_RANGE(NLA_U32, &vni_range),
[MDBE_ATTR_STATE_MASK] = NLA_POLICY_MASK(NLA_U8, MDB_PERMANENT),
};
static int vxlan_mdb_flush_desc_init(struct vxlan_dev *vxlan,
struct vxlan_mdb_flush_desc *desc,
struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = nla_data(tb[MDBA_SET_ENTRY]);
struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
int err;
if (entry->ifindex && entry->ifindex != vxlan->dev->ifindex) {
NL_SET_ERR_MSG_MOD(extack, "Invalid port net device");
return -EINVAL;
}
if (entry->vid) {
NL_SET_ERR_MSG_MOD(extack, "VID must not be specified");
return -EINVAL;
}
if (!tb[MDBA_SET_ENTRY_ATTRS])
return 0;
err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
tb[MDBA_SET_ENTRY_ATTRS],
vxlan_mdbe_attrs_del_bulk_pol, extack);
if (err)
return err;
if (mdbe_attrs[MDBE_ATTR_STATE_MASK]) {
u8 state_mask = nla_get_u8(mdbe_attrs[MDBE_ATTR_STATE_MASK]);
if ((state_mask & MDB_PERMANENT) && !(entry->state & MDB_PERMANENT)) {
NL_SET_ERR_MSG_MOD(extack, "Only permanent MDB entries are supported");
return -EINVAL;
}
}
if (mdbe_attrs[MDBE_ATTR_RTPROT])
desc->rt_protocol = nla_get_u8(mdbe_attrs[MDBE_ATTR_RTPROT]);
if (mdbe_attrs[MDBE_ATTR_DST])
vxlan_nla_get_addr(&desc->remote_ip, mdbe_attrs[MDBE_ATTR_DST]);
if (mdbe_attrs[MDBE_ATTR_DST_PORT])
desc->remote_port =
cpu_to_be16(nla_get_u16(mdbe_attrs[MDBE_ATTR_DST_PORT]));
if (mdbe_attrs[MDBE_ATTR_VNI])
desc->remote_vni =
cpu_to_be32(nla_get_u32(mdbe_attrs[MDBE_ATTR_VNI]));
if (mdbe_attrs[MDBE_ATTR_SRC_VNI])
desc->src_vni =
cpu_to_be32(nla_get_u32(mdbe_attrs[MDBE_ATTR_SRC_VNI]));
return 0;
}
static void vxlan_mdb_remotes_flush(struct vxlan_dev *vxlan,
struct vxlan_mdb_entry *mdb_entry,
const struct vxlan_mdb_flush_desc *desc)
{
struct vxlan_mdb_remote *remote, *tmp;
list_for_each_entry_safe(remote, tmp, &mdb_entry->remotes, list) {
struct vxlan_rdst *rd = rtnl_dereference(remote->rd);
__be32 remote_vni;
if (desc->remote_ip.sa.sa_family &&
!vxlan_addr_equal(&desc->remote_ip, &rd->remote_ip))
continue;
remote_vni = rd->remote_vni ? : mdb_entry->key.vni;
if (desc->remote_vni && desc->remote_vni != remote_vni)
continue;
if (desc->remote_port && desc->remote_port != rd->remote_port)
continue;
if (desc->rt_protocol &&
desc->rt_protocol != remote->rt_protocol)
continue;
vxlan_mdb_remote_del(vxlan, mdb_entry, remote);
}
}
static void vxlan_mdb_flush(struct vxlan_dev *vxlan,
const struct vxlan_mdb_flush_desc *desc)
{
struct vxlan_mdb_entry *mdb_entry;
struct hlist_node *tmp;
hlist_for_each_entry_safe(mdb_entry, tmp, &vxlan->mdb_list, mdb_node) {
if (desc->src_vni && desc->src_vni != mdb_entry->key.vni)
continue;
vxlan_mdb_remotes_flush(vxlan, mdb_entry, desc);
vxlan_mdb_entry_put(vxlan, mdb_entry);
}
}
int vxlan_mdb_del_bulk(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_mdb_flush_desc desc = {};
int err;
ASSERT_RTNL();
err = vxlan_mdb_flush_desc_init(vxlan, &desc, tb, extack);
if (err)
return err;
vxlan_mdb_flush(vxlan, &desc);
return 0;
}
static const struct nla_policy vxlan_mdbe_attrs_get_pol[MDBE_ATTR_MAX + 1] = {
[MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
[MDBE_ATTR_SRC_VNI] = NLA_POLICY_FULL_RANGE(NLA_U32, &vni_range),
};
static int vxlan_mdb_get_parse(struct net_device *dev, struct nlattr *tb[],
struct vxlan_mdb_entry_key *group,
struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = nla_data(tb[MDBA_GET_ENTRY]);
struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
struct vxlan_dev *vxlan = netdev_priv(dev);
int err;
memset(group, 0, sizeof(*group));
group->vni = vxlan->default_dst.remote_vni;
if (!tb[MDBA_GET_ENTRY_ATTRS]) {
vxlan_mdb_group_set(group, entry, NULL);
return 0;
}
err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
tb[MDBA_GET_ENTRY_ATTRS],
vxlan_mdbe_attrs_get_pol, extack);
if (err)
return err;
if (mdbe_attrs[MDBE_ATTR_SOURCE] &&
!vxlan_mdb_is_valid_source(mdbe_attrs[MDBE_ATTR_SOURCE],
entry->addr.proto, extack))
return -EINVAL;
vxlan_mdb_group_set(group, entry, mdbe_attrs[MDBE_ATTR_SOURCE]);
if (mdbe_attrs[MDBE_ATTR_SRC_VNI])
group->vni =
cpu_to_be32(nla_get_u32(mdbe_attrs[MDBE_ATTR_SRC_VNI]));
return 0;
}
static struct sk_buff *
vxlan_mdb_get_reply_alloc(const struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry)
{
struct vxlan_mdb_remote *remote;
size_t nlmsg_size;
nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
nla_total_size(0) +
nla_total_size(0);
list_for_each_entry(remote, &mdb_entry->remotes, list)
nlmsg_size += vxlan_mdb_nlmsg_remote_size(vxlan, mdb_entry,
remote);
return nlmsg_new(nlmsg_size, GFP_KERNEL);
}
static int
vxlan_mdb_get_reply_fill(const struct vxlan_dev *vxlan,
struct sk_buff *skb,
const struct vxlan_mdb_entry *mdb_entry,
u32 portid, u32 seq)
{
struct nlattr *mdb_nest, *mdb_entry_nest;
struct vxlan_mdb_remote *remote;
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
int err;
nlh = nlmsg_put(skb, portid, seq, RTM_NEWMDB, sizeof(*bpm), 0);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->family = AF_BRIDGE;
bpm->ifindex = vxlan->dev->ifindex;
mdb_nest = nla_nest_start_noflag(skb, MDBA_MDB);
if (!mdb_nest) {
err = -EMSGSIZE;
goto cancel;
}
mdb_entry_nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
if (!mdb_entry_nest) {
err = -EMSGSIZE;
goto cancel;
}
list_for_each_entry(remote, &mdb_entry->remotes, list) {
err = vxlan_mdb_entry_info_fill(vxlan, skb, mdb_entry, remote);
if (err)
goto cancel;
}
nla_nest_end(skb, mdb_entry_nest);
nla_nest_end(skb, mdb_nest);
nlmsg_end(skb, nlh);
return 0;
cancel:
nlmsg_cancel(skb, nlh);
return err;
}
int vxlan_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid,
u32 seq, struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_mdb_entry *mdb_entry;
struct vxlan_mdb_entry_key group;
struct sk_buff *skb;
int err;
ASSERT_RTNL();
err = vxlan_mdb_get_parse(dev, tb, &group, extack);
if (err)
return err;
mdb_entry = vxlan_mdb_entry_lookup(vxlan, &group);
if (!mdb_entry) {
NL_SET_ERR_MSG_MOD(extack, "MDB entry not found");
return -ENOENT;
}
skb = vxlan_mdb_get_reply_alloc(vxlan, mdb_entry);
if (!skb)
return -ENOMEM;
err = vxlan_mdb_get_reply_fill(vxlan, skb, mdb_entry, portid, seq);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to fill MDB get reply");
goto free;
}
return rtnl_unicast(skb, dev_net(dev), portid);
free:
kfree_skb(skb);
return err;
}
struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan,
struct sk_buff *skb,
__be32 src_vni)
{
struct vxlan_mdb_entry *mdb_entry;
struct vxlan_mdb_entry_key group;
if (!is_multicast_ether_addr(eth_hdr(skb)->h_dest) ||
is_broadcast_ether_addr(eth_hdr(skb)->h_dest))
return NULL;
if (!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA))
src_vni = vxlan->default_dst.remote_vni;
memset(&group, 0, sizeof(group));
group.vni = src_vni;
switch (skb->protocol) {
case htons(ETH_P_IP):
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
return NULL;
group.dst.sa.sa_family = AF_INET;
group.dst.sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
group.src.sa.sa_family = AF_INET;
group.src.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
return NULL;
group.dst.sa.sa_family = AF_INET6;
group.dst.sin6.sin6_addr = ipv6_hdr(skb)->daddr;
group.src.sa.sa_family = AF_INET6;
group.src.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
break;
#endif
default:
return NULL;
}
mdb_entry = vxlan_mdb_entry_lookup(vxlan, &group);
if (mdb_entry)
return mdb_entry;
memset(&group.src, 0, sizeof(group.src));
mdb_entry = vxlan_mdb_entry_lookup(vxlan, &group);
if (mdb_entry)
return mdb_entry;
switch (skb->protocol) {
case htons(ETH_P_IP):
if (ipv4_is_local_multicast(group.dst.sin.sin_addr.s_addr))
return NULL;
group.dst.sin.sin_addr.s_addr = 0;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
if (ipv6_addr_type(&group.dst.sin6.sin6_addr) &
IPV6_ADDR_LINKLOCAL)
return NULL;
memset(&group.dst.sin6.sin6_addr, 0,
sizeof(group.dst.sin6.sin6_addr));
break;
#endif
default:
return NULL;
}
return vxlan_mdb_entry_lookup(vxlan, &group);
}
netdev_tx_t vxlan_mdb_xmit(struct vxlan_dev *vxlan,
const struct vxlan_mdb_entry *mdb_entry,
struct sk_buff *skb)
{
struct vxlan_mdb_remote *remote, *fremote = NULL;
__be32 src_vni = mdb_entry->key.vni;
list_for_each_entry_rcu(remote, &mdb_entry->remotes, list) {
struct sk_buff *skb1;
if ((vxlan_mdb_is_star_g(&mdb_entry->key) &&
READ_ONCE(remote->filter_mode) == MCAST_INCLUDE) ||
(READ_ONCE(remote->flags) & VXLAN_MDB_REMOTE_F_BLOCKED))
continue;
if (!fremote) {
fremote = remote;
continue;
}
skb1 = skb_clone(skb, GFP_ATOMIC);
if (skb1)
vxlan_xmit_one(skb1, vxlan->dev, src_vni,
rcu_dereference(remote->rd), false);
}
if (fremote)
vxlan_xmit_one(skb, vxlan->dev, src_vni,
rcu_dereference(fremote->rd), false);
else
kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET);
return NETDEV_TX_OK;
}
static void vxlan_mdb_check_empty(void *ptr, void *arg)
{
WARN_ON_ONCE(1);
}
int vxlan_mdb_init(struct vxlan_dev *vxlan)
{
int err;
err = rhashtable_init(&vxlan->mdb_tbl, &vxlan_mdb_rht_params);
if (err)
return err;
INIT_HLIST_HEAD(&vxlan->mdb_list);
return 0;
}
void vxlan_mdb_fini(struct vxlan_dev *vxlan)
{
struct vxlan_mdb_flush_desc desc = {};
vxlan_mdb_flush(vxlan, &desc);
WARN_ON_ONCE(vxlan->cfg.flags & VXLAN_F_MDB);
rhashtable_free_and_destroy(&vxlan->mdb_tbl, vxlan_mdb_check_empty,
NULL);
}
