/* Connection tracking via netlink socket. Allows for user space
|
* protocol helpers and general trouble making from userspace.
|
*
|
* (C) 2001 by Jay Schulist <jschlst@samba.org>
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* (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
|
* (C) 2003 by Patrick Mchardy <kaber@trash.net>
|
* (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
|
*
|
* Initial connection tracking via netlink development funded and
|
* generally made possible by Network Robots, Inc. (www.networkrobots.com)
|
*
|
* Further development of this code funded by Astaro AG (http://www.astaro.com)
|
*
|
* This software may be used and distributed according to the terms
|
* of the GNU General Public License, incorporated herein by reference.
|
*/
|
|
#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/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");
|
|
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)
|
{
|
long timeout = nf_ct_expires(ct) / HZ;
|
|
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)
|
{
|
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);
|
|
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)
|
{
|
u32 mark = READ_ONCE(ct->mark);
|
|
if (!mark)
|
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) (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;
|
int len, ret;
|
char *secctx;
|
|
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
|
if (ret)
|
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, secctx))
|
goto nla_put_failure;
|
nla_nest_end(skb, nest_secctx);
|
|
ret = 0;
|
nla_put_failure:
|
security_release_secctx(secctx, len);
|
return ret;
|
}
|
#else
|
#define ctnetlink_dump_secctx(a, b) (0)
|
#endif
|
|
#ifdef CONFIG_NF_CONNTRACK_LABELS
|
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));
|
}
|
|
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;
|
}
|
#else
|
#define ctnetlink_dump_labels(a, b) (0)
|
#define ctnetlink_label_size(a) (0)
|
#endif
|
|
#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(atomic_read(&ct->ct_general.use))))
|
goto nla_put_failure;
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
/* all these functions access ct->ext. Caller must either hold a reference
|
* on ct or prevent its deletion by holding either the bucket spinlock or
|
* pcpu dying list lock.
|
*/
|
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) < 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) < 0 ||
|
ctnetlink_dump_protoinfo(skb, ct) < 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; /* ORIG, REPLY, MASTER */
|
|
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; /* ORIG, REPLY, MASTER */
|
}
|
|
return len + len4;
|
}
|
#endif
|
|
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) /* CTA_COUNTERS_ORIG|REPL */
|
+ 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
|
+ 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
|
;
|
}
|
|
static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
|
{
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
int len, ret;
|
|
ret = security_secid_to_secctx(ct->secmark, NULL, &len);
|
if (ret)
|
return 0;
|
|
return nla_total_size(0) /* CTA_SECCTX */
|
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
|
#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
|
}
|
|
#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) /* CTA_TUPLE_ORIG|REPL|MASTER */
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
|
+ 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
|
+ ctnetlink_acct_size(ct)
|
+ ctnetlink_timestamp_size(ct)
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
|
+ nla_total_size(0) /* CTA_PROTOINFO */
|
+ nla_total_size(0) /* CTA_HELP */
|
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
|
+ ctnetlink_secctx_size(ct)
|
#if IS_ENABLED(CONFIG_NF_NAT)
|
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
|
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
|
#endif
|
+ ctnetlink_proto_size(ct)
|
+ ctnetlink_label_size(ct)
|
;
|
}
|
|
static int
|
ctnetlink_conntrack_event(unsigned int events, 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_acct(skb, ct, type) < 0 ||
|
ctnetlink_dump_timestamp(skb, ct) < 0)
|
goto nla_put_failure;
|
} else {
|
if (ctnetlink_dump_timeout(skb, ct) < 0)
|
goto nla_put_failure;
|
|
if (events & (1 << IPCT_PROTOINFO)
|
&& ctnetlink_dump_protoinfo(skb, ct) < 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 (events & (1 << IPCT_MARK) &&
|
ctnetlink_dump_mark(skb, ct) < 0)
|
goto nla_put_failure;
|
#endif
|
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 /* CONFIG_NF_CONNTRACK_EVENTS */
|
|
static int ctnetlink_done(struct netlink_callback *cb)
|
{
|
if (cb->args[1])
|
nf_ct_put((struct nf_conn *)cb->args[1]);
|
kfree(cb->data);
|
return 0;
|
}
|
|
struct ctnetlink_filter {
|
u8 family;
|
|
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 {
|
u_int32_t val;
|
u_int32_t mask;
|
} mark;
|
};
|
|
static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
|
[CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
|
[CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
|
};
|
|
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 (filter->orig_flags & ~CTA_FILTER_F_ALL)
|
return -EOPNOTSUPP;
|
}
|
|
if (tb[CTA_FILTER_REPLY_FLAGS]) {
|
filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
|
if (filter->reply_flags & ~CTA_FILTER_F_ALL)
|
return -EOPNOTSUPP;
|
}
|
|
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 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(sizeof(*filter), GFP_KERNEL);
|
if (filter == NULL)
|
return ERR_PTR(-ENOMEM);
|
|
filter->family = family;
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
if (cda[CTA_MARK]) {
|
filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
|
if (cda[CTA_MARK_MASK])
|
filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
|
else
|
filter->mark.mask = 0xffffffff;
|
} else if (cda[CTA_MARK_MASK]) {
|
err = -EINVAL;
|
goto err_filter;
|
}
|
#endif
|
if (!cda[CTA_FILTER])
|
return filter;
|
|
err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
|
if (err < 0)
|
goto err_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];
|
}
|
|
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;
|
|
if (filter == NULL)
|
goto out;
|
|
/* Match entries of a given L3 protocol number.
|
* If it is not specified, ie. l3proto == 0,
|
* then match everything.
|
*/
|
if (filter->family && nf_ct_l3num(ct) != filter->family)
|
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
|
|
out:
|
return 1;
|
|
ignore_entry:
|
return 0;
|
}
|
|
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);
|
struct nf_conn *ct, *last;
|
struct nf_conntrack_tuple_hash *h;
|
struct hlist_nulls_node *n;
|
struct nf_conn *nf_ct_evict[8];
|
int res, i;
|
spinlock_t *lockp;
|
|
last = (struct nf_conn *)cb->args[1];
|
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) {
|
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
continue;
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
if (nf_ct_is_expired(ct)) {
|
if (i < ARRAY_SIZE(nf_ct_evict) &&
|
atomic_inc_not_zero(&ct->ct_general.use))
|
nf_ct_evict[i++] = ct;
|
continue;
|
}
|
|
if (!net_eq(net, nf_ct_net(ct)))
|
continue;
|
|
if (cb->args[1]) {
|
if (ct != last)
|
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) {
|
nf_conntrack_get(&ct->ct_general);
|
cb->args[1] = (unsigned long)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) {
|
/* nf ct hash resize happened, now clear the leftover. */
|
if ((struct nf_conn *)cb->args[1] == last)
|
cb->args[1] = 0;
|
|
nf_ct_put(last);
|
}
|
|
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, NULL, NULL);
|
if (ret < 0)
|
return ret;
|
|
ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
|
cta_ip_nla_policy, NULL);
|
if (ret)
|
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)) {
|
/* Can't manage proto flags without a protonum */
|
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;
|
}
|
|
/* orig and expect tuples get DIR_ORIGINAL */
|
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 },
|
};
|
|
static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
|
{
|
if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
|
return 0;
|
|
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;
|
|
if (ctnetlink_needs_filter(family, cda)) {
|
if (cda[CTA_FILTER])
|
return -EOPNOTSUPP;
|
|
filter = ctnetlink_alloc_filter(cda, family);
|
if (IS_ERR(filter))
|
return PTR_ERR(filter);
|
}
|
|
nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
|
portid, report);
|
kfree(filter);
|
|
return 0;
|
}
|
|
static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_tuple_hash *h;
|
struct nf_conntrack_tuple tuple;
|
struct nf_conn *ct;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
struct nf_conntrack_zone zone;
|
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, &tuple, CTA_TUPLE_ORIG,
|
nfmsg->nfgen_family, &zone);
|
else if (cda[CTA_TUPLE_REPLY])
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
|
nfmsg->nfgen_family, &zone);
|
else {
|
u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
|
|
return ctnetlink_flush_conntrack(net, cda,
|
NETLINK_CB(skb).portid,
|
nlmsg_report(nlh), u3);
|
}
|
|
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 (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
|
nf_ct_put(ct);
|
return -EBUSY;
|
}
|
|
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(nlh));
|
nf_ct_put(ct);
|
|
return 0;
|
}
|
|
static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_tuple_hash *h;
|
struct nf_conntrack_tuple tuple;
|
struct nf_conn *ct;
|
struct sk_buff *skb2 = NULL;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u_int8_t u3 = nfmsg->nfgen_family;
|
struct nf_conntrack_zone zone;
|
int err;
|
|
if (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(ctnl, skb, 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(net, &zone, &tuple);
|
if (!h)
|
return -ENOENT;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
err = -ENOMEM;
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
if (skb2 == NULL) {
|
nf_ct_put(ct);
|
return -ENOMEM;
|
}
|
|
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
|
NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
|
nf_ct_put(ct);
|
if (err <= 0)
|
goto free;
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
if (err < 0)
|
goto out;
|
|
return 0;
|
|
free:
|
kfree_skb(skb2);
|
out:
|
/* this avoids a loop in nfnetlink. */
|
return err == -EAGAIN ? -ENOBUFS : err;
|
}
|
|
static int ctnetlink_done_list(struct netlink_callback *cb)
|
{
|
if (cb->args[1])
|
nf_ct_put((struct nf_conn *)cb->args[1]);
|
return 0;
|
}
|
|
static int
|
ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
|
{
|
struct nf_conn *ct, *last;
|
struct nf_conntrack_tuple_hash *h;
|
struct hlist_nulls_node *n;
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
int res;
|
int cpu;
|
struct hlist_nulls_head *list;
|
struct net *net = sock_net(skb->sk);
|
|
if (cb->args[2])
|
return 0;
|
|
last = (struct nf_conn *)cb->args[1];
|
|
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
|
struct ct_pcpu *pcpu;
|
|
if (!cpu_possible(cpu))
|
continue;
|
|
pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
|
spin_lock_bh(&pcpu->lock);
|
list = dying ? &pcpu->dying : &pcpu->unconfirmed;
|
restart:
|
hlist_nulls_for_each_entry(h, n, list, hnnode) {
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
if (l3proto && nf_ct_l3num(ct) != l3proto)
|
continue;
|
if (cb->args[1]) {
|
if (ct != last)
|
continue;
|
cb->args[1] = 0;
|
}
|
|
/* We can't dump extension info for the unconfirmed
|
* list because unconfirmed conntracks can have
|
* ct->ext reallocated (and thus freed).
|
*
|
* In the dying list case ct->ext can't be free'd
|
* until after we drop pcpu->lock.
|
*/
|
res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
|
ct, dying ? true : false, 0);
|
if (res < 0) {
|
if (!atomic_inc_not_zero(&ct->ct_general.use))
|
continue;
|
cb->args[0] = cpu;
|
cb->args[1] = (unsigned long)ct;
|
spin_unlock_bh(&pcpu->lock);
|
goto out;
|
}
|
}
|
if (cb->args[1]) {
|
cb->args[1] = 0;
|
goto restart;
|
}
|
spin_unlock_bh(&pcpu->lock);
|
}
|
cb->args[2] = 1;
|
out:
|
if (last)
|
nf_ct_put(last);
|
|
return skb->len;
|
}
|
|
static int
|
ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
return ctnetlink_dump_list(skb, cb, true);
|
}
|
|
static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = ctnetlink_dump_dying,
|
.done = ctnetlink_done_list,
|
};
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
}
|
|
return -EOPNOTSUPP;
|
}
|
|
static int
|
ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
return ctnetlink_dump_list(skb, cb, false);
|
}
|
|
static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = ctnetlink_dump_unconfirmed,
|
.done = ctnetlink_done_list,
|
};
|
return netlink_dump_start(ctnl, skb, 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)
|
{
|
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 void
|
__ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
|
unsigned long off)
|
{
|
unsigned int bit;
|
|
/* Ignore these unchangable bits */
|
on &= ~IPS_UNCHANGEABLE_MASK;
|
off &= ~IPS_UNCHANGEABLE_MASK;
|
|
for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
|
if (on & (1 << bit))
|
set_bit(bit, &ct->status);
|
else if (off & (1 << bit))
|
clear_bit(bit, &ct->status);
|
}
|
}
|
|
static int
|
ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
|
{
|
unsigned long d;
|
unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
|
d = ct->status ^ status;
|
|
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
|
/* unchangeable */
|
return -EBUSY;
|
|
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
|
/* SEEN_REPLY bit can only be set */
|
return -EBUSY;
|
|
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
|
/* ASSURED bit can only be set */
|
return -EBUSY;
|
|
__ctnetlink_change_status(ct, status, 0);
|
return 0;
|
}
|
|
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;
|
|
/* don't change helper of sibling connections */
|
if (ct->master) {
|
/* If we try to change the helper to the same thing twice,
|
* treat the second attempt as a no-op instead of returning
|
* an error.
|
*/
|
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) {
|
/* we had a helper before ... */
|
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 (help->helper == helper) {
|
/* update private helper data if allowed. */
|
if (helper->from_nlattr)
|
helper->from_nlattr(helpinfo, ct);
|
err = 0;
|
} else
|
err = -EBUSY;
|
} else {
|
/* we cannot set a helper for an existing conntrack */
|
err = -EOPNOTSUPP;
|
}
|
|
rcu_read_unlock();
|
return err;
|
}
|
|
static int ctnetlink_change_timeout(struct nf_conn *ct,
|
const struct nlattr * const cda[])
|
{
|
u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
|
|
if (timeout > INT_MAX)
|
timeout = INT_MAX;
|
WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
|
|
if (test_bit(IPS_DYING_BIT, &ct->status))
|
return -ETIME;
|
|
return 0;
|
}
|
|
#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_DCCP] = { .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)) /* must be multiple of u32 */
|
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;
|
|
/* only allow NAT changes and master assignation for new conntracks */
|
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;
|
|
timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
|
if (timeout > INT_MAX)
|
timeout = INT_MAX;
|
ct->timeout = (u32)timeout + nfct_time_stamp;
|
|
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;
|
}
|
/* set private helper data if allowed. */
|
if (helper->from_nlattr)
|
helper->from_nlattr(helpinfo, ct);
|
|
/* disable helper auto-assignment for this entry */
|
ct->status |= IPS_HELPER;
|
RCU_INIT_POINTER(help->helper, helper);
|
}
|
} else {
|
/* try an implicit helper assignation */
|
err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
|
if (err < 0)
|
goto err2;
|
}
|
|
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);
|
|
/* we must add conntrack extensions before confirmation. */
|
ct->status |= IPS_CONFIRMED;
|
|
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
|
|
/* setup master conntrack: this is a confirmed expectation */
|
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 err2;
|
|
rcu_read_unlock();
|
|
return ct;
|
|
err2:
|
rcu_read_unlock();
|
err1:
|
nf_conntrack_free(ct);
|
return ERR_PTR(err);
|
}
|
|
static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_tuple otuple, rtuple;
|
struct nf_conntrack_tuple_hash *h = NULL;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
struct nf_conn *ct;
|
u_int8_t u3 = nfmsg->nfgen_family;
|
struct nf_conntrack_zone zone;
|
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(net, &zone, &otuple);
|
else if (cda[CTA_TUPLE_REPLY])
|
h = nf_conntrack_find_get(net, &zone, &rtuple);
|
|
if (h == NULL) {
|
err = -ENOENT;
|
if (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(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(nlh));
|
nf_ct_put(ct);
|
}
|
|
return err;
|
}
|
/* implicit 'else' */
|
|
err = -EEXIST;
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
if (!(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(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)))
|
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 net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = ctnetlink_ct_stat_cpu_dump,
|
};
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
}
|
|
return 0;
|
}
|
|
static int
|
ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
struct net *net)
|
{
|
struct nlmsghdr *nlh;
|
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
|
unsigned int nr_conntracks = atomic_read(&net->ct.count);
|
|
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;
|
|
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 net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
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,
|
nlh->nlmsg_seq,
|
NFNL_MSG_TYPE(nlh->nlmsg_type),
|
sock_net(skb->sk));
|
if (err <= 0)
|
goto free;
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
if (err < 0)
|
goto out;
|
|
return 0;
|
|
free:
|
kfree_skb(skb2);
|
out:
|
/* this avoids a loop in nfnetlink. */
|
return err == -EAGAIN ? -ENOBUFS : err;
|
}
|
|
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] = { .type = NLA_U32 },
|
[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_helper *helper,
|
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) /* CTA_TUPLE_ORIG|REPL|MASTER */
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
|
+ 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
|
+ nla_total_size(0) /* CTA_PROTOINFO */
|
+ nla_total_size(0) /* CTA_HELP */
|
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
|
+ ctnetlink_secctx_size(ct)
|
#if IS_ENABLED(CONFIG_NF_NAT)
|
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
|
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
|
#endif
|
+ ctnetlink_proto_size(ct)
|
;
|
}
|
|
static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
|
enum ip_conntrack_info *ctinfo)
|
{
|
return nf_ct_get(skb, ctinfo);
|
}
|
|
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) < 0)
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_protoinfo(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) < 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))
|
/* SEEN_REPLY bit can only be set */
|
return -EBUSY;
|
|
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
|
/* ASSURED bit can only be set */
|
return -EBUSY;
|
|
/* This check is less strict than ctnetlink_change_status()
|
* because callers often flip IPS_EXPECTED bits when sending
|
* an NFQA_CT attribute to the kernel. So ignore the
|
* unchangeable bits but do not error out. Also user programs
|
* are allowed to clear the bits that they are allowed to change.
|
*/
|
__ctnetlink_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_helper *helper = NULL;
|
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;
|
|
if (cda[CTA_EXPECT_HELP_NAME]) {
|
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
|
|
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
|
nf_ct_protonum(ct));
|
if (helper == NULL)
|
return -EOPNOTSUPP;
|
}
|
|
exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
|
helper, &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 struct nfnl_ct_hook ctnetlink_glue_hook = {
|
.get_ct = ctnetlink_glue_get_ct,
|
.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 /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
|
|
/***********************************************************************
|
* EXPECT
|
***********************************************************************/
|
|
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;
|
}
|
|
static const union nf_inet_addr any_addr;
|
|
static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
|
{
|
static __read_mostly siphash_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_conn_help *help;
|
#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;
|
help = nfct_help(master);
|
if (help) {
|
struct nf_conntrack_helper *helper;
|
|
helper = rcu_dereference(help->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, 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 int ctnetlink_exp_done(struct netlink_callback *cb)
|
{
|
if (cb->args[1])
|
nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
|
return 0;
|
}
|
|
static int
|
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
struct net *net = sock_net(skb->sk);
|
struct nf_conntrack_expect *exp, *last;
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
rcu_read_lock();
|
last = (struct nf_conntrack_expect *)cb->args[1];
|
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 (exp != last)
|
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) {
|
if (!refcount_inc_not_zero(&exp->use))
|
continue;
|
cb->args[1] = (unsigned long)exp;
|
goto out;
|
}
|
}
|
if (cb->args[1]) {
|
cb->args[1] = 0;
|
goto restart;
|
}
|
}
|
out:
|
rcu_read_unlock();
|
if (last)
|
nf_ct_expect_put(last);
|
|
return skb->len;
|
}
|
|
static int
|
ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
struct nf_conntrack_expect *exp, *last;
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
struct nf_conn *ct = cb->data;
|
struct nf_conn_help *help = nfct_help(ct);
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
if (cb->args[0])
|
return 0;
|
|
rcu_read_lock();
|
last = (struct nf_conntrack_expect *)cb->args[1];
|
restart:
|
hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
|
if (l3proto && exp->tuple.src.l3num != l3proto)
|
continue;
|
if (cb->args[1]) {
|
if (exp != last)
|
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) {
|
if (!refcount_inc_not_zero(&exp->use))
|
continue;
|
cb->args[1] = (unsigned long)exp;
|
goto out;
|
}
|
}
|
if (cb->args[1]) {
|
cb->args[1] = 0;
|
goto restart;
|
}
|
cb->args[0] = 1;
|
out:
|
rcu_read_unlock();
|
if (last)
|
nf_ct_expect_put(last);
|
|
return skb->len;
|
}
|
|
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,
|
.done = ctnetlink_exp_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);
|
/* No expectation linked to this connection tracking. */
|
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 net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_tuple tuple;
|
struct nf_conntrack_expect *exp;
|
struct sk_buff *skb2;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u_int8_t u3 = nfmsg->nfgen_family;
|
struct nf_conntrack_zone zone;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
if (cda[CTA_EXPECT_MASTER])
|
return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
|
extack);
|
else {
|
struct netlink_dump_control c = {
|
.dump = ctnetlink_exp_dump_table,
|
.done = ctnetlink_exp_done,
|
};
|
return netlink_dump_start(ctnl, skb, 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;
|
|
exp = nf_ct_expect_find_get(net, &zone, &tuple);
|
if (!exp)
|
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);
|
return -ENOENT;
|
}
|
}
|
|
err = -ENOMEM;
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
if (skb2 == NULL) {
|
nf_ct_expect_put(exp);
|
goto out;
|
}
|
|
rcu_read_lock();
|
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
|
rcu_read_unlock();
|
nf_ct_expect_put(exp);
|
if (err <= 0)
|
goto free;
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
if (err < 0)
|
goto out;
|
|
return 0;
|
|
free:
|
kfree_skb(skb2);
|
out:
|
/* this avoids a loop in nfnetlink. */
|
return err == -EAGAIN ? -ENOBUFS : err;
|
}
|
|
static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
|
{
|
const struct nf_conn_help *m_help;
|
const char *name = data;
|
|
m_help = nfct_help(exp->master);
|
|
return strcmp(m_help->helper->name, name) == 0;
|
}
|
|
static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
|
{
|
return true;
|
}
|
|
static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_expect *exp;
|
struct nf_conntrack_tuple tuple;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u_int8_t u3 = nfmsg->nfgen_family;
|
struct nf_conntrack_zone zone;
|
int err;
|
|
if (cda[CTA_EXPECT_TUPLE]) {
|
/* delete a single expect by 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;
|
|
/* bump usage count to 2 */
|
exp = nf_ct_expect_find_get(net, &zone, &tuple);
|
if (!exp)
|
return -ENOENT;
|
|
if (cda[CTA_EXPECT_ID]) {
|
__be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
|
if (ntohl(id) != (u32)(unsigned long)exp) {
|
nf_ct_expect_put(exp);
|
return -ENOENT;
|
}
|
}
|
|
/* after list removal, usage count == 1 */
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
if (del_timer(&exp->timeout)) {
|
nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
|
nlmsg_report(nlh));
|
nf_ct_expect_put(exp);
|
}
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
/* have to put what we 'get' above.
|
* after this line usage count == 0 */
|
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(net, expect_iter_name, name,
|
NETLINK_CB(skb).portid,
|
nlmsg_report(nlh));
|
} else {
|
/* This basically means we have to flush everything*/
|
nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
|
NETLINK_CB(skb).portid,
|
nlmsg_report(nlh));
|
}
|
|
return 0;
|
}
|
static int
|
ctnetlink_change_expect(struct nf_conntrack_expect *x,
|
const struct nlattr * const cda[])
|
{
|
if (cda[CTA_EXPECT_TIMEOUT]) {
|
if (!del_timer(&x->timeout))
|
return -ETIME;
|
|
x->timeout.expires = jiffies +
|
ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
|
add_timer(&x->timeout);
|
}
|
return 0;
|
}
|
|
static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
|
[CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
|
[CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
|
};
|
|
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_helper *helper,
|
struct nf_conntrack_tuple *tuple,
|
struct nf_conntrack_tuple *mask)
|
{
|
u_int32_t class = 0;
|
struct nf_conntrack_expect *exp;
|
struct nf_conn_help *help;
|
int err;
|
|
help = nfct_help(ct);
|
if (!help)
|
return ERR_PTR(-EOPNOTSUPP);
|
|
if (cda[CTA_EXPECT_CLASS] && helper) {
|
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;
|
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;
|
}
|
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_helper *helper = NULL;
|
struct nf_conntrack_expect *exp;
|
struct nf_conn *ct;
|
int err;
|
|
/* caller guarantees that those three CTA_EXPECT_* exist */
|
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;
|
|
/* Look for master conntrack of this expectation */
|
h = nf_conntrack_find_get(net, zone, &master_tuple);
|
if (!h)
|
return -ENOENT;
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
rcu_read_lock();
|
if (cda[CTA_EXPECT_HELP_NAME]) {
|
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
|
|
helper = __nf_conntrack_helper_find(helpname, u3,
|
nf_ct_protonum(ct));
|
if (helper == NULL) {
|
rcu_read_unlock();
|
#ifdef CONFIG_MODULES
|
if (request_module("nfct-helper-%s", helpname) < 0) {
|
err = -EOPNOTSUPP;
|
goto err_ct;
|
}
|
rcu_read_lock();
|
helper = __nf_conntrack_helper_find(helpname, u3,
|
nf_ct_protonum(ct));
|
if (helper) {
|
err = -EAGAIN;
|
goto err_rcu;
|
}
|
rcu_read_unlock();
|
#endif
|
err = -EOPNOTSUPP;
|
goto err_ct;
|
}
|
}
|
|
exp = ctnetlink_alloc_expect(cda, ct, helper, &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();
|
err_ct:
|
nf_ct_put(ct);
|
return err;
|
}
|
|
static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
struct nf_conntrack_tuple tuple;
|
struct nf_conntrack_expect *exp;
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u_int8_t u3 = nfmsg->nfgen_family;
|
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(net, &zone, &tuple);
|
if (!exp) {
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
err = -ENOENT;
|
if (nlh->nlmsg_flags & NLM_F_CREATE) {
|
err = ctnetlink_create_expect(net, &zone, cda, u3,
|
NETLINK_CB(skb).portid,
|
nlmsg_report(nlh));
|
}
|
return err;
|
}
|
|
err = -EEXIST;
|
if (!(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 net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const cda[],
|
struct netlink_ext_ack *extack)
|
{
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = ctnetlink_exp_stat_cpu_dump,
|
};
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
}
|
|
return 0;
|
}
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
static struct nf_ct_event_notifier ctnl_notifier = {
|
.fcn = ctnetlink_conntrack_event,
|
};
|
|
static struct nf_exp_event_notifier ctnl_notifier_exp = {
|
.fcn = ctnetlink_expect_event,
|
};
|
#endif
|
|
static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
|
[IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
|
.attr_count = CTA_MAX,
|
.policy = ct_nla_policy },
|
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
|
.attr_count = CTA_MAX,
|
.policy = ct_nla_policy },
|
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
|
.attr_count = CTA_MAX,
|
.policy = ct_nla_policy },
|
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
|
.attr_count = CTA_MAX,
|
.policy = ct_nla_policy },
|
[IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
|
[IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
|
[IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
|
[IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
|
};
|
|
static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
|
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
|
.attr_count = CTA_EXPECT_MAX,
|
.policy = exp_nla_policy },
|
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
|
.attr_count = CTA_EXPECT_MAX,
|
.policy = exp_nla_policy },
|
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
|
.attr_count = CTA_EXPECT_MAX,
|
.policy = exp_nla_policy },
|
[IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
|
};
|
|
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
|
int ret;
|
|
ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
|
if (ret < 0) {
|
pr_err("ctnetlink_init: cannot register notifier.\n");
|
goto err_out;
|
}
|
|
ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
|
if (ret < 0) {
|
pr_err("ctnetlink_init: cannot expect register notifier.\n");
|
goto err_unreg_notifier;
|
}
|
#endif
|
return 0;
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
err_unreg_notifier:
|
nf_conntrack_unregister_notifier(net, &ctnl_notifier);
|
err_out:
|
return ret;
|
#endif
|
}
|
|
static void ctnetlink_net_exit(struct net *net)
|
{
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
|
nf_conntrack_unregister_notifier(net, &ctnl_notifier);
|
#endif
|
}
|
|
static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
|
{
|
struct net *net;
|
|
list_for_each_entry(net, net_exit_list, exit_list)
|
ctnetlink_net_exit(net);
|
|
/* wait for other cpus until they are done with ctnl_notifiers */
|
synchronize_rcu();
|
}
|
|
static struct pernet_operations ctnetlink_net_ops = {
|
.init = ctnetlink_net_init,
|
.exit_batch = ctnetlink_net_exit_batch,
|
};
|
|
static int __init ctnetlink_init(void)
|
{
|
int ret;
|
|
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
|
/* setup interaction between nf_queue and nf_conntrack_netlink. */
|
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);
|
