#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rculist.h>
#include <linux/rculist_nulls.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/security.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/siphash.h>
#include <linux/netfilter.h>
#include <net/ipv6.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_seqadj.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
#include <net/netfilter/nf_conntrack_labels.h>
#include <net/netfilter/nf_conntrack_synproxy.h>
#if IS_ENABLED(CONFIG_NF_NAT)
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#endif
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
#include "nf_internals.h"
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("List and change connection tracking table");
struct ctnetlink_list_dump_ctx {
unsigned long last_id;
unsigned int cpu;
bool done;
};
static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l4proto *l4proto)
{
int ret = 0;
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
goto nla_put_failure;
if (likely(l4proto->tuple_to_nlattr))
ret = l4proto->tuple_to_nlattr(skb, tuple);
nla_nest_end(skb, nest_parms);
return ret;
nla_put_failure:
return -1;
}
static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
return -EMSGSIZE;
return 0;
}
static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
return -EMSGSIZE;
return 0;
}
static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
int ret = 0;
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
if (!nest_parms)
goto nla_put_failure;
switch (tuple->src.l3num) {
case NFPROTO_IPV4:
ret = ipv4_tuple_to_nlattr(skb, tuple);
break;
case NFPROTO_IPV6:
ret = ipv6_tuple_to_nlattr(skb, tuple);
break;
}
nla_nest_end(skb, nest_parms);
return ret;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_tuples(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
const struct nf_conntrack_l4proto *l4proto;
int ret;
rcu_read_lock();
ret = ctnetlink_dump_tuples_ip(skb, tuple);
if (ret >= 0) {
l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
}
rcu_read_unlock();
return ret;
}
static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
const struct nf_conntrack_zone *zone, int dir)
{
if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
return 0;
if (nla_put_be16(skb, attrtype, htons(zone->id)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
bool skip_zero)
{
long timeout;
if (nf_ct_is_confirmed(ct))
timeout = nf_ct_expires(ct) / HZ;
else
timeout = ct->timeout / HZ;
if (skip_zero && timeout == 0)
return 0;
if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
bool destroy)
{
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *nest_proto;
int ret;
l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
if (!l4proto->to_nlattr)
return 0;
nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
if (!nest_proto)
goto nla_put_failure;
ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
nla_nest_end(skb, nest_proto);
return ret;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
const struct nf_conn *ct)
{
struct nlattr *nest_helper;
const struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_helper *helper;
if (!help)
return 0;
rcu_read_lock();
helper = rcu_dereference(help->helper);
if (!helper)
goto out;
nest_helper = nla_nest_start(skb, CTA_HELP);
if (!nest_helper)
goto nla_put_failure;
if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
goto nla_put_failure;
if (helper->to_nlattr)
helper->to_nlattr(skb, ct);
nla_nest_end(skb, nest_helper);
out:
rcu_read_unlock();
return 0;
nla_put_failure:
rcu_read_unlock();
return -1;
}
static int
dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
enum ip_conntrack_dir dir, int type)
{
enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nf_conn_counter *counter = acct->counter;
struct nlattr *nest_count;
u64 pkts, bytes;
if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
pkts = atomic64_xchg(&counter[dir].packets, 0);
bytes = atomic64_xchg(&counter[dir].bytes, 0);
} else {
pkts = atomic64_read(&counter[dir].packets);
bytes = atomic64_read(&counter[dir].bytes);
}
nest_count = nla_nest_start(skb, attr);
if (!nest_count)
goto nla_put_failure;
if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
CTA_COUNTERS_PAD) ||
nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
CTA_COUNTERS_PAD))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
{
struct nf_conn_acct *acct = nf_conn_acct_find(ct);
if (!acct)
return 0;
if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
return -1;
if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
return -1;
return 0;
}
static int
ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_count;
const struct nf_conn_tstamp *tstamp;
tstamp = nf_conn_tstamp_find(ct);
if (!tstamp)
return 0;
nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
if (!nest_count)
goto nla_put_failure;
if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
CTA_TIMESTAMP_PAD) ||
(tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
cpu_to_be64(tstamp->stop),
CTA_TIMESTAMP_PAD)))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct,
bool dump)
{
u32 mark = READ_ONCE(ct->mark);
if (!mark && !dump)
return 0;
if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
#else
#define ctnetlink_dump_mark(a, b, c) (0)
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
struct lsm_context ctx;
int ret;
ret = security_secid_to_secctx(ct->secmark, &ctx);
if (ret < 0)
return 0;
ret = -1;
nest_secctx = nla_nest_start(skb, CTA_SECCTX);
if (!nest_secctx)
goto nla_put_failure;
if (nla_put_string(skb, CTA_SECCTX_NAME, ctx.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
security_release_secctx(&ctx);
return ret;
}
#else
#define ctnetlink_dump_secctx(a, b) (0)
#endif
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static int
ctnetlink_dump_event_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
const struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
if (e) {
u64 ts = local64_read(&e->timestamp);
if (ts)
return nla_put_be64(skb, CTA_TIMESTAMP_EVENT,
cpu_to_be64(ts), CTA_TIMESTAMP_PAD);
}
#endif
return 0;
}
static inline int ctnetlink_label_size(const struct nf_conn *ct)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
if (!labels)
return 0;
return nla_total_size(sizeof(labels->bits));
}
#endif
static int
ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
unsigned int i;
if (!labels)
return 0;
i = 0;
do {
if (labels->bits[i] != 0)
return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
labels->bits);
i++;
} while (i < ARRAY_SIZE(labels->bits));
return 0;
}
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_parms;
if (!(ct->status & IPS_EXPECTED))
return 0;
nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int
dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, type);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
htonl(seq->correction_pos)) ||
nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
htonl(seq->offset_before)) ||
nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
htonl(seq->offset_after)))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
{
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
struct nf_ct_seqadj *seq;
if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
return 0;
spin_lock_bh(&ct->lock);
seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
goto err;
seq = &seqadj->seq[IP_CT_DIR_REPLY];
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
goto err;
spin_unlock_bh(&ct->lock);
return 0;
err:
spin_unlock_bh(&ct->lock);
return -1;
}
static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
{
struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
struct nlattr *nest_parms;
if (!synproxy)
return 0;
nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
__be32 id = (__force __be32)nf_ct_get_id(ct);
if (nla_put_be32(skb, CTA_ID, id))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_extinfo(struct sk_buff *skb,
struct nf_conn *ct, u32 type)
{
if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
ctnetlink_dump_timestamp(skb, ct) < 0 ||
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_labels(skb, ct) < 0 ||
ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
ctnetlink_dump_ct_synproxy(skb, ct) < 0)
return -1;
return 0;
}
static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
{
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct, true) < 0 ||
ctnetlink_dump_secctx(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
ctnetlink_dump_master(skb, ct) < 0)
return -1;
if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
(ctnetlink_dump_timeout(skb, ct, false) < 0 ||
ctnetlink_dump_protoinfo(skb, ct, false) < 0))
return -1;
return 0;
}
static int
ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct nf_conn *ct, bool extinfo, unsigned int flags)
{
const struct nf_conntrack_zone *zone;
struct nlmsghdr *nlh;
struct nlattr *nest_parms;
unsigned int event;
if (portid)
flags |= NLM_F_MULTI;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
NFNETLINK_V0, 0);
if (!nlh)
goto nlmsg_failure;
zone = nf_ct_zone(ct);
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
if (ctnetlink_dump_info(skb, ct) < 0)
goto nla_put_failure;
if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nlmsg_failure:
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
[CTA_IP_V4_SRC] = { .type = NLA_U32 },
[CTA_IP_V4_DST] = { .type = NLA_U32 },
[CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
[CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
};
#if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
static size_t ctnetlink_proto_size(const struct nf_conn *ct)
{
const struct nf_conntrack_l4proto *l4proto;
size_t len, len4 = 0;
len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
len *= 3u;
l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
len += l4proto->nlattr_size;
if (l4proto->nlattr_tuple_size) {
len4 = l4proto->nlattr_tuple_size();
len4 *= 3u;
}
return len + len4;
}
static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
{
if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
return 0;
return 2 * nla_total_size(0)
+ 2 * nla_total_size_64bit(sizeof(uint64_t))
+ 2 * nla_total_size_64bit(sizeof(uint64_t))
;
}
static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int ret;
ret = security_secid_to_secctx(ct->secmark, NULL);
if (ret < 0)
return 0;
return nla_total_size(0)
+ nla_total_size(sizeof(char) * ret);
#else
return 0;
#endif
}
static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
return 0;
return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
#else
return 0;
#endif
}
#endif
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
{
return NLMSG_ALIGN(sizeof(struct nfgenmsg))
+ 3 * nla_total_size(0)
+ 3 * nla_total_size(0)
+ 3 * nla_total_size(0)
+ 3 * nla_total_size(sizeof(u_int8_t))
+ nla_total_size(sizeof(u_int32_t))
+ nla_total_size(sizeof(u_int32_t))
+ ctnetlink_acct_size(ct)
+ ctnetlink_timestamp_size(ct)
+ nla_total_size(sizeof(u_int32_t))
+ nla_total_size(0)
+ nla_total_size(0)
+ nla_total_size(NF_CT_HELPER_NAME_LEN)
+ ctnetlink_secctx_size(ct)
#if IS_ENABLED(CONFIG_NF_NAT)
+ 2 * nla_total_size(0)
+ 6 * nla_total_size(sizeof(u_int32_t))
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
+ nla_total_size(sizeof(u_int32_t))
#endif
#ifdef CONFIG_NF_CONNTRACK_ZONES
+ nla_total_size(sizeof(u_int16_t))
#endif
+ ctnetlink_proto_size(ct)
+ ctnetlink_label_size(ct)
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+ nla_total_size(sizeof(u64))
#endif
;
}
static int
ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
{
const struct nf_conntrack_zone *zone;
struct net *net;
struct nlmsghdr *nlh;
struct nlattr *nest_parms;
struct nf_conn *ct = item->ct;
struct sk_buff *skb;
unsigned int type;
unsigned int flags = 0, group;
int err;
if (events & (1 << IPCT_DESTROY)) {
type = IPCTNL_MSG_CT_DELETE;
group = NFNLGRP_CONNTRACK_DESTROY;
} else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
type = IPCTNL_MSG_CT_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
group = NFNLGRP_CONNTRACK_NEW;
} else if (events) {
type = IPCTNL_MSG_CT_NEW;
group = NFNLGRP_CONNTRACK_UPDATE;
} else
return 0;
net = nf_ct_net(ct);
if (!item->report && !nfnetlink_has_listeners(net, group))
return 0;
skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
if (skb == NULL)
goto errout;
type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
NFNETLINK_V0, 0);
if (!nlh)
goto nlmsg_failure;
zone = nf_ct_zone(ct);
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
if (ctnetlink_dump_id(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_DESTROY)) {
if (ctnetlink_dump_timeout(skb, ct, true) < 0)
goto nla_put_failure;
if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
ctnetlink_dump_timestamp(skb, ct) < 0 ||
ctnetlink_dump_protoinfo(skb, ct, true) < 0)
goto nla_put_failure;
} else {
if (ctnetlink_dump_timeout(skb, ct, false) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_PROTOINFO) &&
ctnetlink_dump_protoinfo(skb, ct, false) < 0)
goto nla_put_failure;
if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if ((events & (1 << IPCT_SECMARK) || ct->secmark)
&& ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
if (events & (1 << IPCT_LABEL) &&
ctnetlink_dump_labels(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_RELATED) &&
ctnetlink_dump_master(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_SEQADJ) &&
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_SYNPROXY) &&
ctnetlink_dump_ct_synproxy(skb, ct) < 0)
goto nla_put_failure;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
if (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK)))
goto nla_put_failure;
#endif
if (ctnetlink_dump_event_timestamp(skb, ct))
goto nla_put_failure;
nlmsg_end(skb, nlh);
err = nfnetlink_send(skb, net, item->portid, group, item->report,
GFP_ATOMIC);
if (err == -ENOBUFS || err == -EAGAIN)
return -ENOBUFS;
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
nlmsg_failure:
kfree_skb(skb);
errout:
if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
return -ENOBUFS;
return 0;
}
#endif
static int ctnetlink_done(struct netlink_callback *cb)
{
kfree(cb->data);
return 0;
}
struct ctnetlink_filter_u32 {
u32 val;
u32 mask;
};
struct ctnetlink_filter {
u8 family;
bool zone_filter;
u_int32_t orig_flags;
u_int32_t reply_flags;
struct nf_conntrack_tuple orig;
struct nf_conntrack_tuple reply;
struct nf_conntrack_zone zone;
struct ctnetlink_filter_u32 mark;
struct ctnetlink_filter_u32 status;
};
static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
[CTA_FILTER_ORIG_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
[CTA_FILTER_REPLY_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
};
static int ctnetlink_parse_filter(const struct nlattr *attr,
struct ctnetlink_filter *filter)
{
struct nlattr *tb[CTA_FILTER_MAX + 1];
int ret = 0;
ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
NULL);
if (ret)
return ret;
if (tb[CTA_FILTER_ORIG_FLAGS])
filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
if (tb[CTA_FILTER_REPLY_FLAGS])
filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
return 0;
}
static int ctnetlink_parse_zone(const struct nlattr *attr,
struct nf_conntrack_zone *zone);
static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
struct nf_conntrack_tuple *tuple,
u32 type, u_int8_t l3num,
struct nf_conntrack_zone *zone,
u_int32_t flags);
static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
const struct nlattr * const cda[])
{
#ifdef CONFIG_NF_CONNTRACK_MARK
if (cda[CTA_MARK]) {
mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
if (cda[CTA_MARK_MASK])
mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
else
mark->mask = 0xffffffff;
} else if (cda[CTA_MARK_MASK]) {
return -EINVAL;
}
#endif
return 0;
}
static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
const struct nlattr * const cda[])
{
if (cda[CTA_STATUS]) {
status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
if (cda[CTA_STATUS_MASK])
status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
else
status->mask = status->val;
if (status->mask == 0)
return -EINVAL;
} else if (cda[CTA_STATUS_MASK]) {
return -EINVAL;
}
BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
return 0;
}
static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
{
struct ctnetlink_filter *filter;
int err;
#ifndef CONFIG_NF_CONNTRACK_MARK
if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
return ERR_PTR(-EOPNOTSUPP);
#endif
filter = kzalloc_obj(*filter);
if (filter == NULL)
return ERR_PTR(-ENOMEM);
filter->family = family;
err = ctnetlink_filter_parse_mark(&filter->mark, cda);
if (err)
goto err_filter;
err = ctnetlink_filter_parse_status(&filter->status, cda);
if (err)
goto err_filter;
if (cda[CTA_ZONE]) {
err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
if (err < 0)
goto err_filter;
filter->zone_filter = true;
}
if (!cda[CTA_FILTER])
return filter;
err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
if (err < 0)
goto err_filter;
if (filter->orig_flags) {
if (!cda[CTA_TUPLE_ORIG]) {
err = -EINVAL;
goto err_filter;
}
err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
CTA_TUPLE_ORIG,
filter->family,
&filter->zone,
filter->orig_flags);
if (err < 0)
goto err_filter;
}
if (filter->reply_flags) {
if (!cda[CTA_TUPLE_REPLY]) {
err = -EINVAL;
goto err_filter;
}
err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
CTA_TUPLE_REPLY,
filter->family,
&filter->zone,
filter->reply_flags);
if (err < 0)
goto err_filter;
}
return filter;
err_filter:
kfree(filter);
return ERR_PTR(err);
}
static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
{
return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS] || cda[CTA_ZONE];
}
static int ctnetlink_start(struct netlink_callback *cb)
{
const struct nlattr * const *cda = cb->data;
struct ctnetlink_filter *filter = NULL;
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
u8 family = nfmsg->nfgen_family;
if (ctnetlink_needs_filter(family, cda)) {
filter = ctnetlink_alloc_filter(cda, family);
if (IS_ERR(filter))
return PTR_ERR(filter);
}
cb->data = filter;
return 0;
}
static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
struct nf_conntrack_tuple *ct_tuple,
u_int32_t flags, int family)
{
switch (family) {
case NFPROTO_IPV4:
if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
return 0;
break;
case NFPROTO_IPV6:
if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
!ipv6_addr_cmp(&filter_tuple->src.u3.in6,
&ct_tuple->src.u3.in6))
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
!ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
&ct_tuple->dst.u3.in6))
return 0;
break;
}
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
filter_tuple->dst.protonum != ct_tuple->dst.protonum)
return 0;
switch (ct_tuple->dst.protonum) {
case IPPROTO_TCP:
case IPPROTO_UDP:
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
return 0;
break;
case IPPROTO_ICMP:
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
return 0;
break;
case IPPROTO_ICMPV6:
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
return 0;
break;
}
return 1;
}
static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
{
struct ctnetlink_filter *filter = data;
struct nf_conntrack_tuple *tuple;
u32 status;
if (filter == NULL)
goto out;
if (filter->family && nf_ct_l3num(ct) != filter->family)
goto ignore_entry;
if (filter->zone_filter &&
!nf_ct_zone_equal_any(ct, &filter->zone))
goto ignore_entry;
if (filter->orig_flags) {
tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
filter->orig_flags,
filter->family))
goto ignore_entry;
}
if (filter->reply_flags) {
tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
filter->reply_flags,
filter->family))
goto ignore_entry;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val)
goto ignore_entry;
#endif
status = (u32)READ_ONCE(ct->status);
if ((status & filter->status.mask) != filter->status.val)
goto ignore_entry;
out:
return 1;
ignore_entry:
return 0;
}
static unsigned long ctnetlink_get_id(const struct nf_conn *ct)
{
unsigned long id = nf_ct_get_id(ct);
return id ? id : 1;
}
static int
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
struct net *net = sock_net(skb->sk);
unsigned long last_id = cb->args[1];
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
struct nf_conn *nf_ct_evict[8];
struct nf_conn *ct;
int res, i;
spinlock_t *lockp;
i = 0;
local_bh_disable();
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
restart:
while (i) {
i--;
if (nf_ct_should_gc(nf_ct_evict[i]))
nf_ct_kill(nf_ct_evict[i]);
nf_ct_put(nf_ct_evict[i]);
}
lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
nf_conntrack_lock(lockp);
if (cb->args[0] >= nf_conntrack_htable_size) {
spin_unlock(lockp);
goto out;
}
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (nf_ct_is_expired(ct)) {
if (i < ARRAY_SIZE(nf_ct_evict) &&
refcount_inc_not_zero(&ct->ct_general.use))
nf_ct_evict[i++] = ct;
continue;
}
if (!net_eq(net, nf_ct_net(ct)))
continue;
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
if (cb->args[1]) {
if (ctnetlink_get_id(ct) != last_id)
continue;
cb->args[1] = 0;
}
if (!ctnetlink_filter_match(ct, cb->data))
continue;
res =
ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
ct, true, flags);
if (res < 0) {
cb->args[1] = ctnetlink_get_id(ct);
spin_unlock(lockp);
goto out;
}
}
spin_unlock(lockp);
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
}
out:
local_bh_enable();
if (last_id) {
if (cb->args[1] == last_id)
cb->args[1] = 0;
}
while (i) {
i--;
if (nf_ct_should_gc(nf_ct_evict[i]))
nf_ct_kill(nf_ct_evict[i]);
nf_ct_put(nf_ct_evict[i]);
}
return skb->len;
}
static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t,
u_int32_t flags)
{
if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
if (!tb[CTA_IP_V4_SRC])
return -EINVAL;
t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
}
if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
if (!tb[CTA_IP_V4_DST])
return -EINVAL;
t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
}
return 0;
}
static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t,
u_int32_t flags)
{
if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
if (!tb[CTA_IP_V6_SRC])
return -EINVAL;
t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
}
if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
if (!tb[CTA_IP_V6_DST])
return -EINVAL;
t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
}
return 0;
}
static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
struct nf_conntrack_tuple *tuple,
u_int32_t flags)
{
struct nlattr *tb[CTA_IP_MAX+1];
int ret = 0;
ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr,
cta_ip_nla_policy, NULL);
if (ret < 0)
return ret;
switch (tuple->src.l3num) {
case NFPROTO_IPV4:
ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
break;
case NFPROTO_IPV6:
ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
break;
}
return ret;
}
static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
[CTA_PROTO_NUM] = { .type = NLA_U8 },
};
static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
struct nf_conntrack_tuple *tuple,
u_int32_t flags)
{
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *tb[CTA_PROTO_MAX+1];
int ret = 0;
ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
proto_nla_policy, NULL);
if (ret < 0)
return ret;
if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
return 0;
if (!tb[CTA_PROTO_NUM])
return -EINVAL;
tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
rcu_read_lock();
l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
if (likely(l4proto->nlattr_to_tuple)) {
ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
l4proto->nla_policy,
NULL);
if (ret == 0)
ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
}
rcu_read_unlock();
return ret;
}
static int
ctnetlink_parse_zone(const struct nlattr *attr,
struct nf_conntrack_zone *zone)
{
nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
NF_CT_DEFAULT_ZONE_DIR, 0);
#ifdef CONFIG_NF_CONNTRACK_ZONES
if (attr)
zone->id = ntohs(nla_get_be16(attr));
#else
if (attr)
return -EOPNOTSUPP;
#endif
return 0;
}
static int
ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
struct nf_conntrack_zone *zone)
{
int ret;
if (zone->id != NF_CT_DEFAULT_ZONE_ID)
return -EINVAL;
ret = ctnetlink_parse_zone(attr, zone);
if (ret < 0)
return ret;
if (type == CTA_TUPLE_REPLY)
zone->dir = NF_CT_ZONE_DIR_REPL;
else
zone->dir = NF_CT_ZONE_DIR_ORIG;
return 0;
}
static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
[CTA_TUPLE_IP] = { .type = NLA_NESTED },
[CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
[CTA_TUPLE_ZONE] = { .type = NLA_U16 },
};
#define CTA_FILTER_F_ALL_CTA_PROTO \
(CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
CTA_FILTER_F_CTA_PROTO_DST_PORT | \
CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
static int
ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
struct nf_conntrack_tuple *tuple, u32 type,
u_int8_t l3num, struct nf_conntrack_zone *zone,
u_int32_t flags)
{
struct nlattr *tb[CTA_TUPLE_MAX+1];
int err;
memset(tuple, 0, sizeof(*tuple));
err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
tuple_nla_policy, NULL);
if (err < 0)
return err;
if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
return -EOPNOTSUPP;
tuple->src.l3num = l3num;
if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
if (!tb[CTA_TUPLE_IP])
return -EINVAL;
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
if (err < 0)
return err;
}
if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
if (!tb[CTA_TUPLE_PROTO])
return -EINVAL;
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
if (err < 0)
return err;
} else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
return -EINVAL;
}
if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
if (!zone)
return -EINVAL;
err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
type, zone);
if (err < 0)
return err;
}
if (type == CTA_TUPLE_REPLY)
tuple->dst.dir = IP_CT_DIR_REPLY;
else
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
return 0;
}
static int
ctnetlink_parse_tuple(const struct nlattr * const cda[],
struct nf_conntrack_tuple *tuple, u32 type,
u_int8_t l3num, struct nf_conntrack_zone *zone)
{
return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
CTA_FILTER_FLAG(ALL));
}
static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
[CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
.len = NF_CT_HELPER_NAME_LEN - 1 },
};
static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
struct nlattr **helpinfo)
{
int err;
struct nlattr *tb[CTA_HELP_MAX+1];
err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
help_nla_policy, NULL);
if (err < 0)
return err;
if (!tb[CTA_HELP_NAME])
return -EINVAL;
*helper_name = nla_data(tb[CTA_HELP_NAME]);
if (tb[CTA_HELP_INFO])
*helpinfo = tb[CTA_HELP_INFO];
return 0;
}
static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
[CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
[CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
[CTA_STATUS] = { .type = NLA_U32 },
[CTA_PROTOINFO] = { .type = NLA_NESTED },
[CTA_HELP] = { .type = NLA_NESTED },
[CTA_NAT_SRC] = { .type = NLA_NESTED },
[CTA_TIMEOUT] = { .type = NLA_U32 },
[CTA_MARK] = { .type = NLA_U32 },
[CTA_ID] = { .type = NLA_U32 },
[CTA_NAT_DST] = { .type = NLA_NESTED },
[CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
[CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
[CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
[CTA_ZONE] = { .type = NLA_U16 },
[CTA_MARK_MASK] = { .type = NLA_U32 },
[CTA_LABELS] = { .type = NLA_BINARY,
.len = NF_CT_LABELS_MAX_SIZE },
[CTA_LABELS_MASK] = { .type = NLA_BINARY,
.len = NF_CT_LABELS_MAX_SIZE },
[CTA_FILTER] = { .type = NLA_NESTED },
[CTA_STATUS_MASK] = { .type = NLA_U32 },
[CTA_TIMESTAMP_EVENT] = { .type = NLA_REJECT },
};
static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
{
return ctnetlink_filter_match(ct, data);
}
static int ctnetlink_flush_conntrack(struct net *net,
const struct nlattr * const cda[],
u32 portid, int report, u8 family)
{
struct ctnetlink_filter *filter = NULL;
struct nf_ct_iter_data iter = {
.net = net,
.portid = portid,
.report = report,
};
if (ctnetlink_needs_filter(family, cda)) {
filter = ctnetlink_alloc_filter(cda, family);
if (IS_ERR(filter))
return PTR_ERR(filter);
iter.data = filter;
}
nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
kfree(filter);
return 0;
}
static int ctnetlink_del_conntrack(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
u8 family = info->nfmsg->nfgen_family;
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_zone zone;
struct nf_conn *ct;
int err;
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG] && !cda[CTA_FILTER])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
family, &zone);
else if (cda[CTA_TUPLE_REPLY] && !cda[CTA_FILTER])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
family, &zone);
else {
u8 u3 = info->nfmsg->version || cda[CTA_FILTER] ? family : AF_UNSPEC;
return ctnetlink_flush_conntrack(info->net, cda,
NETLINK_CB(skb).portid,
nlmsg_report(info->nlh), u3);
}
if (err < 0)
return err;
h = nf_conntrack_find_get(info->net, &zone, &tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
if (cda[CTA_ID]) {
__be32 id = nla_get_be32(cda[CTA_ID]);
if (id != (__force __be32)nf_ct_get_id(ct)) {
nf_ct_put(ct);
return -ENOENT;
}
}
nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
nf_ct_put(ct);
return 0;
}
static int ctnetlink_get_conntrack(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
u_int8_t u3 = info->nfmsg->nfgen_family;
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_zone zone;
struct sk_buff *skb2;
struct nf_conn *ct;
int err;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = ctnetlink_start,
.dump = ctnetlink_dump_table,
.done = ctnetlink_done,
.data = (void *)cda,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
u3, &zone);
else if (cda[CTA_TUPLE_REPLY])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
u3, &zone);
else
return -EINVAL;
if (err < 0)
return err;
h = nf_conntrack_find_get(info->net, &zone, &tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2) {
nf_ct_put(ct);
return -ENOMEM;
}
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq,
NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
true, 0);
nf_ct_put(ct);
if (err <= 0) {
kfree_skb(skb2);
return -ENOMEM;
}
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static int ctnetlink_dump_one_entry(struct sk_buff *skb,
struct netlink_callback *cb,
struct nf_conn *ct,
bool dying)
{
struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
u8 l3proto = nfmsg->nfgen_family;
int res;
if (l3proto && nf_ct_l3num(ct) != l3proto)
return 0;
if (ctx->last_id) {
if (ctnetlink_get_id(ct) != ctx->last_id)
return 0;
ctx->last_id = 0;
}
res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
ct, dying, 0);
if (res < 0)
ctx->last_id = ctnetlink_get_id(ct);
return res;
}
#endif
static int
ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
{
return 0;
}
static int
ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
const struct net *net = sock_net(skb->sk);
struct nf_conntrack_net_ecache *ecache_net;
unsigned long last_id = ctx->last_id;
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
#endif
if (ctx->done)
return 0;
ctx->last_id = 0;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
ecache_net = nf_conn_pernet_ecache(net);
spin_lock_bh(&ecache_net->dying_lock);
hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
struct nf_conn *ct;
int res;
ct = nf_ct_tuplehash_to_ctrack(h);
if (last_id && last_id != ctnetlink_get_id(ct))
continue;
res = ctnetlink_dump_one_entry(skb, cb, ct, true);
if (res < 0) {
spin_unlock_bh(&ecache_net->dying_lock);
return skb->len;
}
last_id = 0;
}
spin_unlock_bh(&ecache_net->dying_lock);
#endif
ctx->done = true;
return skb->len;
}
static int ctnetlink_get_ct_dying(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_dump_dying,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
return -EOPNOTSUPP;
}
static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_dump_unconfirmed,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
return -EOPNOTSUPP;
}
#if IS_ENABLED(CONFIG_NF_NAT)
static int
ctnetlink_parse_nat_setup(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr)
__must_hold(RCU)
{
const struct nf_nat_hook *nat_hook;
int err;
nat_hook = rcu_dereference(nf_nat_hook);
if (!nat_hook) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat") < 0) {
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
nat_hook = rcu_dereference(nf_nat_hook);
if (nat_hook)
return -EAGAIN;
#endif
return -EOPNOTSUPP;
}
err = nat_hook->parse_nat_setup(ct, manip, attr);
if (err == -EAGAIN) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
#else
err = -EOPNOTSUPP;
#endif
}
return err;
}
#endif
static int
ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
{
return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS])));
}
static int
ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
{
#if IS_ENABLED(CONFIG_NF_NAT)
int ret;
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
return 0;
ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
cda[CTA_NAT_DST]);
if (ret < 0)
return ret;
return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
cda[CTA_NAT_SRC]);
#else
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
return 0;
return -EOPNOTSUPP;
#endif
}
static int ctnetlink_change_helper(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conntrack_helper *helper;
struct nf_conn_help *help = nfct_help(ct);
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
int err;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
return err;
if (ct->master) {
err = -EBUSY;
if (help) {
rcu_read_lock();
helper = rcu_dereference(help->helper);
if (helper && !strcmp(helper->name, helpname))
err = 0;
rcu_read_unlock();
}
return err;
}
if (!strcmp(helpname, "")) {
if (help && help->helper) {
nf_ct_remove_expectations(ct);
RCU_INIT_POINTER(help->helper, NULL);
}
return 0;
}
rcu_read_lock();
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL) {
rcu_read_unlock();
return -EOPNOTSUPP;
}
if (help) {
if (rcu_access_pointer(help->helper) == helper) {
if (helper->from_nlattr)
helper->from_nlattr(helpinfo, ct);
err = 0;
} else
err = -EBUSY;
} else {
err = -EOPNOTSUPP;
}
rcu_read_unlock();
return err;
}
static int ctnetlink_change_timeout(struct nf_conn *ct,
const struct nlattr * const cda[])
{
return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ);
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
static void ctnetlink_change_mark(struct nf_conn *ct,
const struct nlattr * const cda[])
{
u32 mark, newmark, mask = 0;
if (cda[CTA_MARK_MASK])
mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
mark = ntohl(nla_get_be32(cda[CTA_MARK]));
newmark = (READ_ONCE(ct->mark) & mask) ^ mark;
if (newmark != READ_ONCE(ct->mark))
WRITE_ONCE(ct->mark, newmark);
}
#endif
static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
[CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
[CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
};
static int ctnetlink_change_protoinfo(struct nf_conn *ct,
const struct nlattr * const cda[])
{
const struct nlattr *attr = cda[CTA_PROTOINFO];
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *tb[CTA_PROTOINFO_MAX+1];
int err = 0;
err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
protoinfo_policy, NULL);
if (err < 0)
return err;
l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
if (l4proto->from_nlattr)
err = l4proto->from_nlattr(tb, ct);
return err;
}
static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
[CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
[CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
[CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
};
static int change_seq_adj(struct nf_ct_seqadj *seq,
const struct nlattr * const attr)
{
int err;
struct nlattr *cda[CTA_SEQADJ_MAX+1];
err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
seqadj_policy, NULL);
if (err < 0)
return err;
if (!cda[CTA_SEQADJ_CORRECTION_POS])
return -EINVAL;
seq->correction_pos =
ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
return -EINVAL;
seq->offset_before =
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
if (!cda[CTA_SEQADJ_OFFSET_AFTER])
return -EINVAL;
seq->offset_after =
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
return 0;
}
static int
ctnetlink_change_seq_adj(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
int ret = 0;
if (!seqadj)
return 0;
spin_lock_bh(&ct->lock);
if (cda[CTA_SEQ_ADJ_ORIG]) {
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
cda[CTA_SEQ_ADJ_ORIG]);
if (ret < 0)
goto err;
set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
if (cda[CTA_SEQ_ADJ_REPLY]) {
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
cda[CTA_SEQ_ADJ_REPLY]);
if (ret < 0)
goto err;
set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
spin_unlock_bh(&ct->lock);
return 0;
err:
spin_unlock_bh(&ct->lock);
return ret;
}
static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
[CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
[CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
[CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
};
static int ctnetlink_change_synproxy(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
int err;
if (!synproxy)
return 0;
err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
cda[CTA_SYNPROXY], synproxy_policy,
NULL);
if (err < 0)
return err;
if (!tb[CTA_SYNPROXY_ISN] ||
!tb[CTA_SYNPROXY_ITS] ||
!tb[CTA_SYNPROXY_TSOFF])
return -EINVAL;
synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
return 0;
}
static int
ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
{
#ifdef CONFIG_NF_CONNTRACK_LABELS
size_t len = nla_len(cda[CTA_LABELS]);
const void *mask = cda[CTA_LABELS_MASK];
if (len & (sizeof(u32)-1))
return -EINVAL;
if (mask) {
if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
nla_len(cda[CTA_LABELS_MASK]) != len)
return -EINVAL;
mask = nla_data(cda[CTA_LABELS_MASK]);
}
len /= sizeof(u32);
return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
#else
return -EOPNOTSUPP;
#endif
}
static int
ctnetlink_change_conntrack(struct nf_conn *ct,
const struct nlattr * const cda[])
{
int err;
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
return -EOPNOTSUPP;
if (cda[CTA_HELP]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_TIMEOUT]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_PROTOINFO]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK])
ctnetlink_change_mark(ct, cda);
#endif
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
err = ctnetlink_change_seq_adj(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_SYNPROXY]) {
err = ctnetlink_change_synproxy(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_LABELS]) {
err = ctnetlink_attach_labels(ct, cda);
if (err < 0)
return err;
}
return 0;
}
static struct nf_conn *
ctnetlink_create_conntrack(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nlattr * const cda[],
struct nf_conntrack_tuple *otuple,
struct nf_conntrack_tuple *rtuple,
u8 u3)
{
struct nf_conn *ct;
int err = -EINVAL;
struct nf_conntrack_helper *helper;
struct nf_conn_tstamp *tstamp;
u64 timeout;
ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
if (IS_ERR(ct))
return ERR_PTR(-ENOMEM);
if (!cda[CTA_TIMEOUT])
goto err1;
rcu_read_lock();
if (cda[CTA_HELP]) {
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
goto err2;
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL) {
rcu_read_unlock();
#ifdef CONFIG_MODULES
if (request_module("nfct-helper-%s", helpname) < 0) {
err = -EOPNOTSUPP;
goto err1;
}
rcu_read_lock();
helper = __nf_conntrack_helper_find(helpname,
nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper) {
err = -EAGAIN;
goto err2;
}
rcu_read_unlock();
#endif
err = -EOPNOTSUPP;
goto err1;
} else {
struct nf_conn_help *help;
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
if (help == NULL) {
err = -ENOMEM;
goto err2;
}
if (helper->from_nlattr)
helper->from_nlattr(helpinfo, ct);
ct->status |= IPS_HELPER;
RCU_INIT_POINTER(help->helper, helper);
}
}
err = ctnetlink_setup_nat(ct, cda);
if (err < 0)
goto err2;
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
nf_ct_labels_ext_add(ct);
nfct_seqadj_ext_add(ct);
nfct_synproxy_ext_add(ct);
ct->status |= IPS_CONFIRMED;
timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
__nf_ct_set_timeout(ct, timeout);
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
goto err2;
}
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
err = ctnetlink_change_seq_adj(ct, cda);
if (err < 0)
goto err2;
}
memset(&ct->proto, 0, sizeof(ct->proto));
if (cda[CTA_PROTOINFO]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
goto err2;
}
if (cda[CTA_SYNPROXY]) {
err = ctnetlink_change_synproxy(ct, cda);
if (err < 0)
goto err2;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK])
ctnetlink_change_mark(ct, cda);
#endif
if (cda[CTA_TUPLE_MASTER]) {
struct nf_conntrack_tuple master;
struct nf_conntrack_tuple_hash *master_h;
struct nf_conn *master_ct;
err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
u3, NULL);
if (err < 0)
goto err2;
master_h = nf_conntrack_find_get(net, zone, &master);
if (master_h == NULL) {
err = -ENOENT;
goto err2;
}
master_ct = nf_ct_tuplehash_to_ctrack(master_h);
__set_bit(IPS_EXPECTED_BIT, &ct->status);
ct->master = master_ct;
}
tstamp = nf_conn_tstamp_find(ct);
if (tstamp)
tstamp->start = ktime_get_real_ns();
err = nf_conntrack_hash_check_insert(ct);
if (err < 0)
goto err3;
rcu_read_unlock();
return ct;
err3:
if (ct->master)
nf_ct_put(ct->master);
err2:
rcu_read_unlock();
err1:
nf_conntrack_free(ct);
return ERR_PTR(err);
}
static int ctnetlink_new_conntrack(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
struct nf_conntrack_tuple otuple, rtuple;
struct nf_conntrack_tuple_hash *h = NULL;
u_int8_t u3 = info->nfmsg->nfgen_family;
struct nf_conntrack_zone zone;
struct nf_conn *ct;
int err;
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG]) {
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
u3, &zone);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_REPLY]) {
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
u3, &zone);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_ORIG])
h = nf_conntrack_find_get(info->net, &zone, &otuple);
else if (cda[CTA_TUPLE_REPLY])
h = nf_conntrack_find_get(info->net, &zone, &rtuple);
if (h == NULL) {
err = -ENOENT;
if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
enum ip_conntrack_events events;
if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
return -EINVAL;
if (otuple.dst.protonum != rtuple.dst.protonum)
return -EINVAL;
ct = ctnetlink_create_conntrack(info->net, &zone, cda,
&otuple, &rtuple, u3);
if (IS_ERR(ct))
return PTR_ERR(ct);
err = 0;
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
events = 1 << IPCT_RELATED;
else
events = 1 << IPCT_NEW;
if (cda[CTA_LABELS] &&
ctnetlink_attach_labels(ct, cda) == 0)
events |= (1 << IPCT_LABEL);
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
(1 << IPCT_ASSURED) |
(1 << IPCT_HELPER) |
(1 << IPCT_PROTOINFO) |
(1 << IPCT_SEQADJ) |
(1 << IPCT_MARK) |
(1 << IPCT_SYNPROXY) |
events,
ct, NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
nf_ct_put(ct);
}
return err;
}
err = -EEXIST;
ct = nf_ct_tuplehash_to_ctrack(h);
if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
err = ctnetlink_change_conntrack(ct, cda);
if (err == 0) {
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
(1 << IPCT_ASSURED) |
(1 << IPCT_HELPER) |
(1 << IPCT_LABEL) |
(1 << IPCT_PROTOINFO) |
(1 << IPCT_SEQADJ) |
(1 << IPCT_MARK) |
(1 << IPCT_SYNPROXY),
ct, NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
}
}
nf_ct_put(ct);
return err;
}
static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
__u16 cpu, const struct ip_conntrack_stat *st)
{
struct nlmsghdr *nlh;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
IPCTNL_MSG_CT_GET_STATS_CPU);
nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
NFNETLINK_V0, htons(cpu));
if (!nlh)
goto nlmsg_failure;
if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
htonl(st->insert_failed)) ||
nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
htonl(st->search_restart)) ||
nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
htonl(st->clash_resolve)) ||
nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
htonl(st->chaintoolong)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int cpu;
struct net *net = sock_net(skb->sk);
if (cb->args[0] == nr_cpu_ids)
return 0;
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
const struct ip_conntrack_stat *st;
if (!cpu_possible(cpu))
continue;
st = per_cpu_ptr(net->ct.stat, cpu);
if (ctnetlink_ct_stat_cpu_fill_info(skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
cpu, st) < 0)
break;
}
cb->args[0] = cpu;
return skb->len;
}
static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_ct_stat_cpu_dump,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
return 0;
}
static int
ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct net *net)
{
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
unsigned int nr_conntracks;
struct nlmsghdr *nlh;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
NFNETLINK_V0, 0);
if (!nlh)
goto nlmsg_failure;
nr_conntracks = nf_conntrack_count(net);
if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
goto nla_put_failure;
if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const cda[])
{
struct sk_buff *skb2;
int err;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (skb2 == NULL)
return -ENOMEM;
err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq,
NFNL_MSG_TYPE(info->nlh->nlmsg_type),
sock_net(skb->sk));
if (err <= 0) {
kfree_skb(skb2);
return -ENOMEM;
}
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
}
static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
[CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
[CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
[CTA_EXPECT_MASK] = { .type = NLA_NESTED },
[CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
[CTA_EXPECT_ID] = { .type = NLA_U32 },
[CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
.len = NF_CT_HELPER_NAME_LEN - 1 },
[CTA_EXPECT_ZONE] = { .type = NLA_U16 },
[CTA_EXPECT_FLAGS] = NLA_POLICY_MASK(NLA_BE32, NF_CT_EXPECT_MASK),
[CTA_EXPECT_CLASS] = { .type = NLA_U32 },
[CTA_EXPECT_NAT] = { .type = NLA_NESTED },
[CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
};
static struct nf_conntrack_expect *
ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *mask);
#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
static size_t
ctnetlink_glue_build_size(const struct nf_conn *ct)
{
return 3 * nla_total_size(0)
+ 3 * nla_total_size(0)
+ 3 * nla_total_size(0)
+ 3 * nla_total_size(sizeof(u_int8_t))
+ nla_total_size(sizeof(u_int32_t))
+ nla_total_size(sizeof(u_int32_t))
+ nla_total_size(sizeof(u_int32_t))
+ nla_total_size(0)
+ nla_total_size(0)
+ nla_total_size(NF_CT_HELPER_NAME_LEN)
+ ctnetlink_secctx_size(ct)
+ ctnetlink_acct_size(ct)
+ ctnetlink_timestamp_size(ct)
#if IS_ENABLED(CONFIG_NF_NAT)
+ 2 * nla_total_size(0)
+ 6 * nla_total_size(sizeof(u_int32_t))
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
+ nla_total_size(sizeof(u_int32_t))
#endif
#ifdef CONFIG_NF_CONNTRACK_ZONES
+ nla_total_size(sizeof(u_int16_t))
#endif
+ ctnetlink_proto_size(ct)
;
}
static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
struct nlattr *nest_parms;
zone = nf_ct_zone(ct);
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nla_put_failure;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
if (ctnetlink_dump_id(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_timeout(skb, ct, false) < 0)
goto nla_put_failure;
if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
goto nla_put_failure;
if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
ctnetlink_dump_timestamp(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
goto nla_put_failure;
if ((ct->status & IPS_SEQ_ADJUST) &&
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (ctnetlink_dump_mark(skb, ct, true) < 0)
goto nla_put_failure;
#endif
if (ctnetlink_dump_labels(skb, ct) < 0)
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
static int
ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
u_int16_t ct_attr, u_int16_t ct_info_attr)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, ct_attr);
if (!nest_parms)
goto nla_put_failure;
if (__ctnetlink_glue_build(skb, ct) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
static int
ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
{
unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
unsigned long d = ct->status ^ status;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
return -EBUSY;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
return -EBUSY;
__nf_ct_change_status(ct, status, ~status);
return 0;
}
static int
ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
{
int err;
if (cda[CTA_TIMEOUT]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS]) {
err = ctnetlink_update_status(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_HELP]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_LABELS]) {
err = ctnetlink_attach_labels(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK]) {
ctnetlink_change_mark(ct, cda);
}
#endif
return 0;
}
static int
ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
{
struct nlattr *cda[CTA_MAX+1];
int ret;
ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
NULL);
if (ret < 0)
return ret;
return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
}
static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
const struct nf_conn *ct,
struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *mask)
{
int err;
err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
nf_ct_l3num(ct), NULL);
if (err < 0)
return err;
return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
nf_ct_l3num(ct), NULL);
}
static int
ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
u32 portid, u32 report)
{
struct nlattr *cda[CTA_EXPECT_MAX+1];
struct nf_conntrack_tuple tuple, mask;
struct nf_conntrack_expect *exp;
int err;
err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
exp_nla_policy, NULL);
if (err < 0)
return err;
err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
ct, &tuple, &mask);
if (err < 0)
return err;
exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
&tuple, &mask);
if (IS_ERR(exp))
return PTR_ERR(exp);
err = nf_ct_expect_related_report(exp, portid, report, 0);
nf_ct_expect_put(exp);
return err;
}
static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
if (!(ct->status & IPS_NAT_MASK))
return;
nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
}
static const struct nfnl_ct_hook ctnetlink_glue_hook = {
.build_size = ctnetlink_glue_build_size,
.build = ctnetlink_glue_build,
.parse = ctnetlink_glue_parse,
.attach_expect = ctnetlink_glue_attach_expect,
.seq_adjust = ctnetlink_glue_seqadj,
};
#endif
static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
u32 type)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, type);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, tuple) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple_mask *mask)
{
const struct nf_conntrack_l4proto *l4proto;
struct nf_conntrack_tuple m;
struct nlattr *nest_parms;
int ret;
memset(&m, 0xFF, sizeof(m));
memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
m.src.u.all = mask->src.u.all;
m.src.l3num = tuple->src.l3num;
m.dst.protonum = tuple->dst.protonum;
nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
if (!nest_parms)
goto nla_put_failure;
rcu_read_lock();
ret = ctnetlink_dump_tuples_ip(skb, &m);
if (ret >= 0) {
l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
}
rcu_read_unlock();
if (unlikely(ret < 0))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
#if IS_ENABLED(CONFIG_NF_NAT)
static const union nf_inet_addr any_addr;
#endif
static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
{
static siphash_aligned_key_t exp_id_seed;
unsigned long a, b, c, d;
net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
a = (unsigned long)exp;
b = (unsigned long)exp->helper;
c = (unsigned long)exp->master;
d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
#ifdef CONFIG_64BIT
return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
#else
return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
#endif
}
static int
ctnetlink_exp_dump_expect(struct sk_buff *skb,
const struct nf_conntrack_expect *exp)
{
struct nf_conn *master = exp->master;
long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
struct nf_conntrack_helper *helper;
#if IS_ENABLED(CONFIG_NF_NAT)
struct nlattr *nest_parms;
struct nf_conntrack_tuple nat_tuple = {};
#endif
struct nf_ct_helper_expectfn *expfn;
if (timeout < 0)
timeout = 0;
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
goto nla_put_failure;
if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
goto nla_put_failure;
if (ctnetlink_exp_dump_tuple(skb,
&master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
CTA_EXPECT_MASTER) < 0)
goto nla_put_failure;
#if IS_ENABLED(CONFIG_NF_NAT)
if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
exp->saved_proto.all) {
nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
goto nla_put_failure;
nat_tuple.src.l3num = nf_ct_l3num(master);
nat_tuple.src.u3 = exp->saved_addr;
nat_tuple.dst.protonum = nf_ct_protonum(master);
nat_tuple.src.u = exp->saved_proto;
if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
CTA_EXPECT_NAT_TUPLE) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
}
#endif
if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
goto nla_put_failure;
helper = rcu_dereference(exp->helper);
if (helper &&
nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
goto nla_put_failure;
expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
if (expfn != NULL &&
nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
int event, const struct nf_conntrack_expect *exp)
{
struct nlmsghdr *nlh;
unsigned int flags = portid ? NLM_F_MULTI : 0;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
nlh = nfnl_msg_put(skb, portid, seq, event, flags,
exp->tuple.src.l3num, NFNETLINK_V0, 0);
if (!nlh)
goto nlmsg_failure;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nlmsg_failure:
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static int
ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
{
struct nf_conntrack_expect *exp = item->exp;
struct net *net = nf_ct_exp_net(exp);
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned int type, group;
int flags = 0;
if (events & (1 << IPEXP_DESTROY)) {
type = IPCTNL_MSG_EXP_DELETE;
group = NFNLGRP_CONNTRACK_EXP_DESTROY;
} else if (events & (1 << IPEXP_NEW)) {
type = IPCTNL_MSG_EXP_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
group = NFNLGRP_CONNTRACK_EXP_NEW;
} else
return 0;
if (!item->report && !nfnetlink_has_listeners(net, group))
return 0;
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (skb == NULL)
goto errout;
type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
exp->tuple.src.l3num, NFNETLINK_V0, 0);
if (!nlh)
goto nlmsg_failure;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nla_put_failure;
nlmsg_end(skb, nlh);
nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
nlmsg_failure:
kfree_skb(skb);
errout:
nfnetlink_set_err(net, 0, 0, -ENOBUFS);
return 0;
}
#endif
static unsigned long ctnetlink_exp_id(const struct nf_conntrack_expect *exp)
{
unsigned long id = (unsigned long)exp;
id += nf_ct_get_id(exp->master);
id += exp->class;
return id ? id : 1;
}
static int
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
u_int8_t l3proto = nfmsg->nfgen_family;
unsigned long last_id = cb->args[1];
struct nf_conntrack_expect *exp;
rcu_read_lock();
for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
restart:
hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
hnode) {
if (l3proto && exp->tuple.src.l3num != l3proto)
continue;
if (!net_eq(nf_ct_net(exp->master), net))
continue;
if (cb->args[1]) {
if (ctnetlink_exp_id(exp) != last_id)
continue;
cb->args[1] = 0;
}
if (ctnetlink_exp_fill_info(skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
exp) < 0) {
cb->args[1] = ctnetlink_exp_id(exp);
goto out;
}
}
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
}
out:
rcu_read_unlock();
return skb->len;
}
static int
ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
struct nf_conn *ct = cb->data;
struct nf_conn_help *help;
u_int8_t l3proto = nfmsg->nfgen_family;
unsigned long last_id = cb->args[1];
struct nf_conntrack_expect *exp;
if (cb->args[0])
return 0;
help = nfct_help(ct);
if (!help)
return 0;
rcu_read_lock();
restart:
hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
if (l3proto && exp->tuple.src.l3num != l3proto)
continue;
if (cb->args[1]) {
if (ctnetlink_exp_id(exp) != last_id)
continue;
cb->args[1] = 0;
}
if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
exp) < 0) {
cb->args[1] = ctnetlink_exp_id(exp);
goto out;
}
}
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
cb->args[0] = 1;
out:
rcu_read_unlock();
return skb->len;
}
static int ctnetlink_dump_exp_ct_start(struct netlink_callback *cb)
{
struct nf_conn *ct = cb->data;
if (!refcount_inc_not_zero(&ct->ct_general.use))
return -ENOENT;
return 0;
}
static int ctnetlink_dump_exp_ct_done(struct netlink_callback *cb)
{
struct nf_conn *ct = cb->data;
if (ct)
nf_ct_put(ct);
return 0;
}
static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
int err;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
struct nf_conntrack_zone zone;
struct netlink_dump_control c = {
.dump = ctnetlink_exp_ct_dump_table,
.start = ctnetlink_dump_exp_ct_start,
.done = ctnetlink_dump_exp_ct_done,
};
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
u3, NULL);
if (err < 0)
return err;
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;
h = nf_conntrack_find_get(net, &zone, &tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
if (!nfct_help(ct)) {
nf_ct_put(ct);
return 0;
}
c.data = ct;
err = netlink_dump_start(ctnl, skb, nlh, &c);
nf_ct_put(ct);
return err;
}
static int ctnetlink_get_expect(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
u_int8_t u3 = info->nfmsg->nfgen_family;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct nf_conntrack_zone zone;
struct sk_buff *skb2;
int err;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
if (cda[CTA_EXPECT_MASTER])
return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
info->nlh, cda,
info->extack);
else {
struct netlink_dump_control c = {
.dump = ctnetlink_exp_dump_table,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
}
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_EXPECT_TUPLE])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
u3, NULL);
else if (cda[CTA_EXPECT_MASTER])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
u3, NULL);
else
return -EINVAL;
if (err < 0)
return err;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
spin_lock_bh(&nf_conntrack_expect_lock);
exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
if (!exp) {
spin_unlock_bh(&nf_conntrack_expect_lock);
kfree_skb(skb2);
return -ENOENT;
}
if (cda[CTA_EXPECT_ID]) {
__be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
if (id != nf_expect_get_id(exp)) {
nf_ct_expect_put(exp);
spin_unlock_bh(&nf_conntrack_expect_lock);
kfree_skb(skb2);
return -ENOENT;
}
}
rcu_read_lock();
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
exp);
rcu_read_unlock();
nf_ct_expect_put(exp);
spin_unlock_bh(&nf_conntrack_expect_lock);
if (err <= 0) {
kfree_skb(skb2);
return -ENOMEM;
}
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
}
static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
{
struct nf_conntrack_helper *helper;
const char *name = data;
helper = rcu_dereference(exp->helper);
if (!helper)
return false;
return strcmp(helper->name, name) == 0;
}
static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
{
return true;
}
static int ctnetlink_del_expect(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
u_int8_t u3 = info->nfmsg->nfgen_family;
struct nf_conntrack_expect *exp;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_zone zone;
int err;
if (cda[CTA_EXPECT_TUPLE]) {
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
u3, NULL);
if (err < 0)
return err;
spin_lock_bh(&nf_conntrack_expect_lock);
exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
if (!exp) {
spin_unlock_bh(&nf_conntrack_expect_lock);
return -ENOENT;
}
if (cda[CTA_EXPECT_ID]) {
__be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
if (id != nf_expect_get_id(exp)) {
nf_ct_expect_put(exp);
spin_unlock_bh(&nf_conntrack_expect_lock);
return -ENOENT;
}
}
if (timer_delete(&exp->timeout)) {
nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
nf_ct_expect_put(exp);
}
spin_unlock_bh(&nf_conntrack_expect_lock);
nf_ct_expect_put(exp);
} else if (cda[CTA_EXPECT_HELP_NAME]) {
char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
} else {
nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
}
return 0;
}
static int
ctnetlink_change_expect(struct nf_conntrack_expect *x,
const struct nlattr * const cda[])
{
if (cda[CTA_EXPECT_TIMEOUT]) {
if (!timer_delete(&x->timeout))
return -ETIME;
x->timeout.expires = jiffies +
ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
add_timer(&x->timeout);
}
return 0;
}
#if IS_ENABLED(CONFIG_NF_NAT)
static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
[CTA_EXPECT_NAT_DIR] = NLA_POLICY_MAX(NLA_BE32, IP_CT_DIR_REPLY),
[CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
};
#endif
static int
ctnetlink_parse_expect_nat(const struct nlattr *attr,
struct nf_conntrack_expect *exp,
u_int8_t u3)
{
#if IS_ENABLED(CONFIG_NF_NAT)
struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
struct nf_conntrack_tuple nat_tuple = {};
int err;
err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
exp_nat_nla_policy, NULL);
if (err < 0)
return err;
if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
return -EINVAL;
err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
&nat_tuple, CTA_EXPECT_NAT_TUPLE,
u3, NULL);
if (err < 0)
return err;
exp->saved_addr = nat_tuple.src.u3;
exp->saved_proto = nat_tuple.src.u;
exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static struct nf_conntrack_expect *
ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *mask)
{
struct net *net = read_pnet(&ct->ct_net);
struct nf_conntrack_helper *helper;
struct nf_conntrack_expect *exp;
struct nf_conn_help *help;
u32 class = 0;
int err;
help = nfct_help(ct);
if (!help)
return ERR_PTR(-EOPNOTSUPP);
helper = rcu_dereference(help->helper);
if (!helper)
return ERR_PTR(-EOPNOTSUPP);
if (cda[CTA_EXPECT_CLASS]) {
class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
if (class > helper->expect_class_max)
return ERR_PTR(-EINVAL);
}
exp = nf_ct_expect_alloc(ct);
if (!exp)
return ERR_PTR(-ENOMEM);
if (cda[CTA_EXPECT_FLAGS]) {
exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
exp->flags &= ~NF_CT_EXPECT_USERSPACE;
} else {
exp->flags = 0;
}
if (cda[CTA_EXPECT_FN]) {
const char *name = nla_data(cda[CTA_EXPECT_FN]);
struct nf_ct_helper_expectfn *expfn;
expfn = nf_ct_helper_expectfn_find_by_name(name);
if (expfn == NULL) {
err = -EINVAL;
goto err_out;
}
exp->expectfn = expfn->expectfn;
} else
exp->expectfn = NULL;
exp->class = class;
exp->master = ct;
write_pnet(&exp->net, net);
#ifdef CONFIG_NF_CONNTRACK_ZONES
exp->zone = ct->zone;
#endif
rcu_assign_pointer(exp->helper, helper);
exp->tuple = *tuple;
exp->mask.src.u3 = mask->src.u3;
exp->mask.src.u.all = mask->src.u.all;
if (cda[CTA_EXPECT_NAT]) {
err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
exp, nf_ct_l3num(ct));
if (err < 0)
goto err_out;
#if IS_ENABLED(CONFIG_NF_NAT)
} else {
memset(&exp->saved_addr, 0, sizeof(exp->saved_addr));
memset(&exp->saved_proto, 0, sizeof(exp->saved_proto));
exp->dir = 0;
#endif
}
return exp;
err_out:
nf_ct_expect_put(exp);
return ERR_PTR(err);
}
static int
ctnetlink_create_expect(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nlattr * const cda[],
u_int8_t u3, u32 portid, int report)
{
struct nf_conntrack_tuple tuple, mask, master_tuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nf_conntrack_expect *exp;
struct nf_conn *ct;
int err;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
u3, NULL);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
u3, NULL);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
u3, NULL);
if (err < 0)
return err;
h = nf_conntrack_find_get(net, zone, &master_tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
rcu_read_lock();
exp = ctnetlink_alloc_expect(cda, ct, &tuple, &mask);
if (IS_ERR(exp)) {
err = PTR_ERR(exp);
goto err_rcu;
}
err = nf_ct_expect_related_report(exp, portid, report, 0);
nf_ct_expect_put(exp);
err_rcu:
rcu_read_unlock();
nf_ct_put(ct);
return err;
}
static int ctnetlink_new_expect(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
u_int8_t u3 = info->nfmsg->nfgen_family;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct nf_conntrack_zone zone;
int err;
if (!cda[CTA_EXPECT_TUPLE]
|| !cda[CTA_EXPECT_MASK]
|| !cda[CTA_EXPECT_MASTER])
return -EINVAL;
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
u3, NULL);
if (err < 0)
return err;
spin_lock_bh(&nf_conntrack_expect_lock);
exp = __nf_ct_expect_find(info->net, &zone, &tuple);
if (!exp) {
spin_unlock_bh(&nf_conntrack_expect_lock);
err = -ENOENT;
if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
err = ctnetlink_create_expect(info->net, &zone, cda, u3,
NETLINK_CB(skb).portid,
nlmsg_report(info->nlh));
}
return err;
}
err = -EEXIST;
if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_expect(exp, cda);
spin_unlock_bh(&nf_conntrack_expect_lock);
return err;
}
static int
ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
const struct ip_conntrack_stat *st)
{
struct nlmsghdr *nlh;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
IPCTNL_MSG_EXP_GET_STATS_CPU);
nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
NFNETLINK_V0, htons(cpu));
if (!nlh)
goto nlmsg_failure;
if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static int
ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int cpu;
struct net *net = sock_net(skb->sk);
if (cb->args[0] == nr_cpu_ids)
return 0;
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
const struct ip_conntrack_stat *st;
if (!cpu_possible(cpu))
continue;
st = per_cpu_ptr(net->ct.stat, cpu);
if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
cpu, st) < 0)
break;
}
cb->args[0] = cpu;
return skb->len;
}
static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const cda[])
{
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_exp_stat_cpu_dump,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
return 0;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static struct nf_ct_event_notifier ctnl_notifier = {
.ct_event = ctnetlink_conntrack_event,
.exp_event = ctnetlink_expect_event,
};
#endif
static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
[IPCTNL_MSG_CT_NEW] = {
.call = ctnetlink_new_conntrack,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_MAX,
.policy = ct_nla_policy
},
[IPCTNL_MSG_CT_GET] = {
.call = ctnetlink_get_conntrack,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_MAX,
.policy = ct_nla_policy
},
[IPCTNL_MSG_CT_DELETE] = {
.call = ctnetlink_del_conntrack,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_MAX,
.policy = ct_nla_policy
},
[IPCTNL_MSG_CT_GET_CTRZERO] = {
.call = ctnetlink_get_conntrack,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_MAX,
.policy = ct_nla_policy
},
[IPCTNL_MSG_CT_GET_STATS_CPU] = {
.call = ctnetlink_stat_ct_cpu,
.type = NFNL_CB_MUTEX,
},
[IPCTNL_MSG_CT_GET_STATS] = {
.call = ctnetlink_stat_ct,
.type = NFNL_CB_MUTEX,
},
[IPCTNL_MSG_CT_GET_DYING] = {
.call = ctnetlink_get_ct_dying,
.type = NFNL_CB_MUTEX,
},
[IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
.call = ctnetlink_get_ct_unconfirmed,
.type = NFNL_CB_MUTEX,
},
};
static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
[IPCTNL_MSG_EXP_GET] = {
.call = ctnetlink_get_expect,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_EXPECT_MAX,
.policy = exp_nla_policy
},
[IPCTNL_MSG_EXP_NEW] = {
.call = ctnetlink_new_expect,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_EXPECT_MAX,
.policy = exp_nla_policy
},
[IPCTNL_MSG_EXP_DELETE] = {
.call = ctnetlink_del_expect,
.type = NFNL_CB_MUTEX,
.attr_count = CTA_EXPECT_MAX,
.policy = exp_nla_policy
},
[IPCTNL_MSG_EXP_GET_STATS_CPU] = {
.call = ctnetlink_stat_exp_cpu,
.type = NFNL_CB_MUTEX,
},
};
static const struct nfnetlink_subsystem ctnl_subsys = {
.name = "conntrack",
.subsys_id = NFNL_SUBSYS_CTNETLINK,
.cb_count = IPCTNL_MSG_MAX,
.cb = ctnl_cb,
};
static const struct nfnetlink_subsystem ctnl_exp_subsys = {
.name = "conntrack_expect",
.subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
.cb_count = IPCTNL_MSG_EXP_MAX,
.cb = ctnl_exp_cb,
};
MODULE_ALIAS("ip_conntrack_netlink");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
static int __net_init ctnetlink_net_init(struct net *net)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
nf_conntrack_register_notifier(net, &ctnl_notifier);
#endif
return 0;
}
static void ctnetlink_net_pre_exit(struct net *net)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
nf_conntrack_unregister_notifier(net);
#endif
}
static struct pernet_operations ctnetlink_net_ops = {
.init = ctnetlink_net_init,
.pre_exit = ctnetlink_net_pre_exit,
};
static int __init ctnetlink_init(void)
{
int ret;
NL_ASSERT_CTX_FITS(struct ctnetlink_list_dump_ctx);
ret = nfnetlink_subsys_register(&ctnl_subsys);
if (ret < 0) {
pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
goto err_out;
}
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
if (ret < 0) {
pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
goto err_unreg_subsys;
}
ret = register_pernet_subsys(&ctnetlink_net_ops);
if (ret < 0) {
pr_err("ctnetlink_init: cannot register pernet operations\n");
goto err_unreg_exp_subsys;
}
#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
#endif
return 0;
err_unreg_exp_subsys:
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
err_unreg_subsys:
nfnetlink_subsys_unregister(&ctnl_subsys);
err_out:
return ret;
}
static void __exit ctnetlink_exit(void)
{
unregister_pernet_subsys(&ctnetlink_net_ops);
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
RCU_INIT_POINTER(nfnl_ct_hook, NULL);
#endif
synchronize_rcu();
}
module_init(ctnetlink_init);
module_exit(ctnetlink_exit);
