1 /* Connection state tracking for netfilter. This is separated from,
2 but required by, the NAT layer; it can also be used by an iptables
5 /* (C) 1999-2001 Paul `Rusty' Russell
6 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
7 * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
8 * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/types.h>
18 #include <linux/netfilter.h>
19 #include <linux/module.h>
20 #include <linux/sched.h>
21 #include <linux/skbuff.h>
22 #include <linux/proc_fs.h>
23 #include <linux/vmalloc.h>
24 #include <linux/stddef.h>
25 #include <linux/slab.h>
26 #include <linux/random.h>
27 #include <linux/jhash.h>
28 #include <linux/err.h>
29 #include <linux/percpu.h>
30 #include <linux/moduleparam.h>
31 #include <linux/notifier.h>
32 #include <linux/kernel.h>
33 #include <linux/netdevice.h>
34 #include <linux/socket.h>
36 #include <linux/nsproxy.h>
37 #include <linux/rculist_nulls.h>
39 #include <net/netfilter/nf_conntrack.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_expect.h>
43 #include <net/netfilter/nf_conntrack_helper.h>
44 #include <net/netfilter/nf_conntrack_seqadj.h>
45 #include <net/netfilter/nf_conntrack_core.h>
46 #include <net/netfilter/nf_conntrack_extend.h>
47 #include <net/netfilter/nf_conntrack_acct.h>
48 #include <net/netfilter/nf_conntrack_ecache.h>
49 #include <net/netfilter/nf_conntrack_zones.h>
50 #include <net/netfilter/nf_conntrack_timestamp.h>
51 #include <net/netfilter/nf_conntrack_timeout.h>
52 #include <net/netfilter/nf_conntrack_labels.h>
53 #include <net/netfilter/nf_conntrack_synproxy.h>
54 #include <net/netfilter/nf_nat.h>
55 #include <net/netfilter/nf_nat_core.h>
56 #include <net/netfilter/nf_nat_helper.h>
57 #include <net/netns/hash.h>
59 #define NF_CONNTRACK_VERSION "0.5.0"
61 int (*nfnetlink_parse_nat_setup_hook
)(struct nf_conn
*ct
,
62 enum nf_nat_manip_type manip
,
63 const struct nlattr
*attr
) __read_mostly
;
64 EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook
);
66 __cacheline_aligned_in_smp spinlock_t nf_conntrack_locks
[CONNTRACK_LOCKS
];
67 EXPORT_SYMBOL_GPL(nf_conntrack_locks
);
69 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(nf_conntrack_expect_lock
);
70 EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock
);
72 struct hlist_nulls_head
*nf_conntrack_hash __read_mostly
;
73 EXPORT_SYMBOL_GPL(nf_conntrack_hash
);
75 struct conntrack_gc_work
{
76 struct delayed_work dwork
;
83 static __read_mostly
struct kmem_cache
*nf_conntrack_cachep
;
84 static __read_mostly spinlock_t nf_conntrack_locks_all_lock
;
85 static __read_mostly
DEFINE_SPINLOCK(nf_conntrack_locks_all_lock
);
86 static __read_mostly
bool nf_conntrack_locks_all
;
88 /* every gc cycle scans at most 1/GC_MAX_BUCKETS_DIV part of table */
89 #define GC_MAX_BUCKETS_DIV 128u
90 /* upper bound of full table scan */
91 #define GC_MAX_SCAN_JIFFIES (16u * HZ)
92 /* desired ratio of entries found to be expired */
93 #define GC_EVICT_RATIO 50u
95 static struct conntrack_gc_work conntrack_gc_work
;
97 void nf_conntrack_lock(spinlock_t
*lock
) __acquires(lock
)
100 while (unlikely(nf_conntrack_locks_all
)) {
104 * Order the 'nf_conntrack_locks_all' load vs. the
105 * spin_unlock_wait() loads below, to ensure
106 * that 'nf_conntrack_locks_all_lock' is indeed held:
108 smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */
109 spin_unlock_wait(&nf_conntrack_locks_all_lock
);
113 EXPORT_SYMBOL_GPL(nf_conntrack_lock
);
115 static void nf_conntrack_double_unlock(unsigned int h1
, unsigned int h2
)
117 h1
%= CONNTRACK_LOCKS
;
118 h2
%= CONNTRACK_LOCKS
;
119 spin_unlock(&nf_conntrack_locks
[h1
]);
121 spin_unlock(&nf_conntrack_locks
[h2
]);
124 /* return true if we need to recompute hashes (in case hash table was resized) */
125 static bool nf_conntrack_double_lock(struct net
*net
, unsigned int h1
,
126 unsigned int h2
, unsigned int sequence
)
128 h1
%= CONNTRACK_LOCKS
;
129 h2
%= CONNTRACK_LOCKS
;
131 nf_conntrack_lock(&nf_conntrack_locks
[h1
]);
133 spin_lock_nested(&nf_conntrack_locks
[h2
],
134 SINGLE_DEPTH_NESTING
);
136 nf_conntrack_lock(&nf_conntrack_locks
[h2
]);
137 spin_lock_nested(&nf_conntrack_locks
[h1
],
138 SINGLE_DEPTH_NESTING
);
140 if (read_seqcount_retry(&nf_conntrack_generation
, sequence
)) {
141 nf_conntrack_double_unlock(h1
, h2
);
147 static void nf_conntrack_all_lock(void)
151 spin_lock(&nf_conntrack_locks_all_lock
);
152 nf_conntrack_locks_all
= true;
155 * Order the above store of 'nf_conntrack_locks_all' against
156 * the spin_unlock_wait() loads below, such that if
157 * nf_conntrack_lock() observes 'nf_conntrack_locks_all'
158 * we must observe nf_conntrack_locks[] held:
160 smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */
162 for (i
= 0; i
< CONNTRACK_LOCKS
; i
++) {
163 spin_unlock_wait(&nf_conntrack_locks
[i
]);
167 static void nf_conntrack_all_unlock(void)
170 * All prior stores must be complete before we clear
171 * 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock()
172 * might observe the false value but not the entire
175 smp_store_release(&nf_conntrack_locks_all
, false);
176 spin_unlock(&nf_conntrack_locks_all_lock
);
179 unsigned int nf_conntrack_htable_size __read_mostly
;
180 EXPORT_SYMBOL_GPL(nf_conntrack_htable_size
);
182 unsigned int nf_conntrack_max __read_mostly
;
183 seqcount_t nf_conntrack_generation __read_mostly
;
184 static unsigned int nf_conntrack_hash_rnd __read_mostly
;
186 static u32
hash_conntrack_raw(const struct nf_conntrack_tuple
*tuple
,
187 const struct net
*net
)
192 get_random_once(&nf_conntrack_hash_rnd
, sizeof(nf_conntrack_hash_rnd
));
194 /* The direction must be ignored, so we hash everything up to the
195 * destination ports (which is a multiple of 4) and treat the last
196 * three bytes manually.
198 seed
= nf_conntrack_hash_rnd
^ net_hash_mix(net
);
199 n
= (sizeof(tuple
->src
) + sizeof(tuple
->dst
.u3
)) / sizeof(u32
);
200 return jhash2((u32
*)tuple
, n
, seed
^
201 (((__force __u16
)tuple
->dst
.u
.all
<< 16) |
202 tuple
->dst
.protonum
));
205 static u32
scale_hash(u32 hash
)
207 return reciprocal_scale(hash
, nf_conntrack_htable_size
);
210 static u32
__hash_conntrack(const struct net
*net
,
211 const struct nf_conntrack_tuple
*tuple
,
214 return reciprocal_scale(hash_conntrack_raw(tuple
, net
), size
);
217 static u32
hash_conntrack(const struct net
*net
,
218 const struct nf_conntrack_tuple
*tuple
)
220 return scale_hash(hash_conntrack_raw(tuple
, net
));
224 nf_ct_get_tuple(const struct sk_buff
*skb
,
226 unsigned int dataoff
,
230 struct nf_conntrack_tuple
*tuple
,
231 const struct nf_conntrack_l3proto
*l3proto
,
232 const struct nf_conntrack_l4proto
*l4proto
)
234 memset(tuple
, 0, sizeof(*tuple
));
236 tuple
->src
.l3num
= l3num
;
237 if (l3proto
->pkt_to_tuple(skb
, nhoff
, tuple
) == 0)
240 tuple
->dst
.protonum
= protonum
;
241 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
243 return l4proto
->pkt_to_tuple(skb
, dataoff
, net
, tuple
);
245 EXPORT_SYMBOL_GPL(nf_ct_get_tuple
);
247 bool nf_ct_get_tuplepr(const struct sk_buff
*skb
, unsigned int nhoff
,
249 struct net
*net
, struct nf_conntrack_tuple
*tuple
)
251 struct nf_conntrack_l3proto
*l3proto
;
252 struct nf_conntrack_l4proto
*l4proto
;
253 unsigned int protoff
;
259 l3proto
= __nf_ct_l3proto_find(l3num
);
260 ret
= l3proto
->get_l4proto(skb
, nhoff
, &protoff
, &protonum
);
261 if (ret
!= NF_ACCEPT
) {
266 l4proto
= __nf_ct_l4proto_find(l3num
, protonum
);
268 ret
= nf_ct_get_tuple(skb
, nhoff
, protoff
, l3num
, protonum
, net
, tuple
,
274 EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr
);
277 nf_ct_invert_tuple(struct nf_conntrack_tuple
*inverse
,
278 const struct nf_conntrack_tuple
*orig
,
279 const struct nf_conntrack_l3proto
*l3proto
,
280 const struct nf_conntrack_l4proto
*l4proto
)
282 memset(inverse
, 0, sizeof(*inverse
));
284 inverse
->src
.l3num
= orig
->src
.l3num
;
285 if (l3proto
->invert_tuple(inverse
, orig
) == 0)
288 inverse
->dst
.dir
= !orig
->dst
.dir
;
290 inverse
->dst
.protonum
= orig
->dst
.protonum
;
291 return l4proto
->invert_tuple(inverse
, orig
);
293 EXPORT_SYMBOL_GPL(nf_ct_invert_tuple
);
296 clean_from_lists(struct nf_conn
*ct
)
298 pr_debug("clean_from_lists(%p)\n", ct
);
299 hlist_nulls_del_rcu(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
);
300 hlist_nulls_del_rcu(&ct
->tuplehash
[IP_CT_DIR_REPLY
].hnnode
);
302 /* Destroy all pending expectations */
303 nf_ct_remove_expectations(ct
);
306 /* must be called with local_bh_disable */
307 static void nf_ct_add_to_dying_list(struct nf_conn
*ct
)
309 struct ct_pcpu
*pcpu
;
311 /* add this conntrack to the (per cpu) dying list */
312 ct
->cpu
= smp_processor_id();
313 pcpu
= per_cpu_ptr(nf_ct_net(ct
)->ct
.pcpu_lists
, ct
->cpu
);
315 spin_lock(&pcpu
->lock
);
316 hlist_nulls_add_head(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
,
318 spin_unlock(&pcpu
->lock
);
321 /* must be called with local_bh_disable */
322 static void nf_ct_add_to_unconfirmed_list(struct nf_conn
*ct
)
324 struct ct_pcpu
*pcpu
;
326 /* add this conntrack to the (per cpu) unconfirmed list */
327 ct
->cpu
= smp_processor_id();
328 pcpu
= per_cpu_ptr(nf_ct_net(ct
)->ct
.pcpu_lists
, ct
->cpu
);
330 spin_lock(&pcpu
->lock
);
331 hlist_nulls_add_head(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
,
333 spin_unlock(&pcpu
->lock
);
336 /* must be called with local_bh_disable */
337 static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn
*ct
)
339 struct ct_pcpu
*pcpu
;
341 /* We overload first tuple to link into unconfirmed or dying list.*/
342 pcpu
= per_cpu_ptr(nf_ct_net(ct
)->ct
.pcpu_lists
, ct
->cpu
);
344 spin_lock(&pcpu
->lock
);
345 BUG_ON(hlist_nulls_unhashed(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
));
346 hlist_nulls_del_rcu(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
);
347 spin_unlock(&pcpu
->lock
);
350 #define NFCT_ALIGN(len) (((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK)
352 /* Released via destroy_conntrack() */
353 struct nf_conn
*nf_ct_tmpl_alloc(struct net
*net
,
354 const struct nf_conntrack_zone
*zone
,
357 struct nf_conn
*tmpl
, *p
;
359 if (ARCH_KMALLOC_MINALIGN
<= NFCT_INFOMASK
) {
360 tmpl
= kzalloc(sizeof(*tmpl
) + NFCT_INFOMASK
, flags
);
365 tmpl
= (struct nf_conn
*)NFCT_ALIGN((unsigned long)p
);
367 tmpl
= (struct nf_conn
*)NFCT_ALIGN((unsigned long)p
);
368 tmpl
->proto
.tmpl_padto
= (char *)tmpl
- (char *)p
;
371 tmpl
= kzalloc(sizeof(*tmpl
), flags
);
376 tmpl
->status
= IPS_TEMPLATE
;
377 write_pnet(&tmpl
->ct_net
, net
);
378 nf_ct_zone_add(tmpl
, zone
);
379 atomic_set(&tmpl
->ct_general
.use
, 0);
383 EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc
);
385 void nf_ct_tmpl_free(struct nf_conn
*tmpl
)
387 nf_ct_ext_destroy(tmpl
);
388 nf_ct_ext_free(tmpl
);
390 if (ARCH_KMALLOC_MINALIGN
<= NFCT_INFOMASK
)
391 kfree((char *)tmpl
- tmpl
->proto
.tmpl_padto
);
395 EXPORT_SYMBOL_GPL(nf_ct_tmpl_free
);
398 destroy_conntrack(struct nf_conntrack
*nfct
)
400 struct nf_conn
*ct
= (struct nf_conn
*)nfct
;
401 struct nf_conntrack_l4proto
*l4proto
;
403 pr_debug("destroy_conntrack(%p)\n", ct
);
404 NF_CT_ASSERT(atomic_read(&nfct
->use
) == 0);
406 if (unlikely(nf_ct_is_template(ct
))) {
411 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
412 if (l4proto
->destroy
)
413 l4proto
->destroy(ct
);
418 /* Expectations will have been removed in clean_from_lists,
419 * except TFTP can create an expectation on the first packet,
420 * before connection is in the list, so we need to clean here,
423 nf_ct_remove_expectations(ct
);
425 nf_ct_del_from_dying_or_unconfirmed_list(ct
);
430 nf_ct_put(ct
->master
);
432 pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct
);
433 nf_conntrack_free(ct
);
436 static void nf_ct_delete_from_lists(struct nf_conn
*ct
)
438 struct net
*net
= nf_ct_net(ct
);
439 unsigned int hash
, reply_hash
;
440 unsigned int sequence
;
442 nf_ct_helper_destroy(ct
);
446 sequence
= read_seqcount_begin(&nf_conntrack_generation
);
447 hash
= hash_conntrack(net
,
448 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
);
449 reply_hash
= hash_conntrack(net
,
450 &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
);
451 } while (nf_conntrack_double_lock(net
, hash
, reply_hash
, sequence
));
453 clean_from_lists(ct
);
454 nf_conntrack_double_unlock(hash
, reply_hash
);
456 nf_ct_add_to_dying_list(ct
);
461 bool nf_ct_delete(struct nf_conn
*ct
, u32 portid
, int report
)
463 struct nf_conn_tstamp
*tstamp
;
465 if (test_and_set_bit(IPS_DYING_BIT
, &ct
->status
))
468 tstamp
= nf_conn_tstamp_find(ct
);
469 if (tstamp
&& tstamp
->stop
== 0)
470 tstamp
->stop
= ktime_get_real_ns();
472 if (nf_conntrack_event_report(IPCT_DESTROY
, ct
,
473 portid
, report
) < 0) {
474 /* destroy event was not delivered. nf_ct_put will
475 * be done by event cache worker on redelivery.
477 nf_ct_delete_from_lists(ct
);
478 nf_conntrack_ecache_delayed_work(nf_ct_net(ct
));
482 nf_conntrack_ecache_work(nf_ct_net(ct
));
483 nf_ct_delete_from_lists(ct
);
487 EXPORT_SYMBOL_GPL(nf_ct_delete
);
490 nf_ct_key_equal(struct nf_conntrack_tuple_hash
*h
,
491 const struct nf_conntrack_tuple
*tuple
,
492 const struct nf_conntrack_zone
*zone
,
493 const struct net
*net
)
495 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
497 /* A conntrack can be recreated with the equal tuple,
498 * so we need to check that the conntrack is confirmed
500 return nf_ct_tuple_equal(tuple
, &h
->tuple
) &&
501 nf_ct_zone_equal(ct
, zone
, NF_CT_DIRECTION(h
)) &&
502 nf_ct_is_confirmed(ct
) &&
503 net_eq(net
, nf_ct_net(ct
));
506 /* caller must hold rcu readlock and none of the nf_conntrack_locks */
507 static void nf_ct_gc_expired(struct nf_conn
*ct
)
509 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
512 if (nf_ct_should_gc(ct
))
520 * - Caller must take a reference on returned object
521 * and recheck nf_ct_tuple_equal(tuple, &h->tuple)
523 static struct nf_conntrack_tuple_hash
*
524 ____nf_conntrack_find(struct net
*net
, const struct nf_conntrack_zone
*zone
,
525 const struct nf_conntrack_tuple
*tuple
, u32 hash
)
527 struct nf_conntrack_tuple_hash
*h
;
528 struct hlist_nulls_head
*ct_hash
;
529 struct hlist_nulls_node
*n
;
530 unsigned int bucket
, hsize
;
533 nf_conntrack_get_ht(&ct_hash
, &hsize
);
534 bucket
= reciprocal_scale(hash
, hsize
);
536 hlist_nulls_for_each_entry_rcu(h
, n
, &ct_hash
[bucket
], hnnode
) {
539 ct
= nf_ct_tuplehash_to_ctrack(h
);
540 if (nf_ct_is_expired(ct
)) {
541 nf_ct_gc_expired(ct
);
545 if (nf_ct_is_dying(ct
))
548 if (nf_ct_key_equal(h
, tuple
, zone
, net
))
552 * if the nulls value we got at the end of this lookup is
553 * not the expected one, we must restart lookup.
554 * We probably met an item that was moved to another chain.
556 if (get_nulls_value(n
) != bucket
) {
557 NF_CT_STAT_INC_ATOMIC(net
, search_restart
);
564 /* Find a connection corresponding to a tuple. */
565 static struct nf_conntrack_tuple_hash
*
566 __nf_conntrack_find_get(struct net
*net
, const struct nf_conntrack_zone
*zone
,
567 const struct nf_conntrack_tuple
*tuple
, u32 hash
)
569 struct nf_conntrack_tuple_hash
*h
;
574 h
= ____nf_conntrack_find(net
, zone
, tuple
, hash
);
576 ct
= nf_ct_tuplehash_to_ctrack(h
);
577 if (unlikely(nf_ct_is_dying(ct
) ||
578 !atomic_inc_not_zero(&ct
->ct_general
.use
)))
581 if (unlikely(!nf_ct_key_equal(h
, tuple
, zone
, net
))) {
592 struct nf_conntrack_tuple_hash
*
593 nf_conntrack_find_get(struct net
*net
, const struct nf_conntrack_zone
*zone
,
594 const struct nf_conntrack_tuple
*tuple
)
596 return __nf_conntrack_find_get(net
, zone
, tuple
,
597 hash_conntrack_raw(tuple
, net
));
599 EXPORT_SYMBOL_GPL(nf_conntrack_find_get
);
601 static void __nf_conntrack_hash_insert(struct nf_conn
*ct
,
603 unsigned int reply_hash
)
605 hlist_nulls_add_head_rcu(&ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
,
606 &nf_conntrack_hash
[hash
]);
607 hlist_nulls_add_head_rcu(&ct
->tuplehash
[IP_CT_DIR_REPLY
].hnnode
,
608 &nf_conntrack_hash
[reply_hash
]);
612 nf_conntrack_hash_check_insert(struct nf_conn
*ct
)
614 const struct nf_conntrack_zone
*zone
;
615 struct net
*net
= nf_ct_net(ct
);
616 unsigned int hash
, reply_hash
;
617 struct nf_conntrack_tuple_hash
*h
;
618 struct hlist_nulls_node
*n
;
619 unsigned int sequence
;
621 zone
= nf_ct_zone(ct
);
625 sequence
= read_seqcount_begin(&nf_conntrack_generation
);
626 hash
= hash_conntrack(net
,
627 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
);
628 reply_hash
= hash_conntrack(net
,
629 &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
);
630 } while (nf_conntrack_double_lock(net
, hash
, reply_hash
, sequence
));
632 /* See if there's one in the list already, including reverse */
633 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[hash
], hnnode
)
634 if (nf_ct_key_equal(h
, &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
638 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[reply_hash
], hnnode
)
639 if (nf_ct_key_equal(h
, &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
,
644 /* The caller holds a reference to this object */
645 atomic_set(&ct
->ct_general
.use
, 2);
646 __nf_conntrack_hash_insert(ct
, hash
, reply_hash
);
647 nf_conntrack_double_unlock(hash
, reply_hash
);
648 NF_CT_STAT_INC(net
, insert
);
653 nf_conntrack_double_unlock(hash
, reply_hash
);
654 NF_CT_STAT_INC(net
, insert_failed
);
658 EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert
);
660 static inline void nf_ct_acct_update(struct nf_conn
*ct
,
661 enum ip_conntrack_info ctinfo
,
664 struct nf_conn_acct
*acct
;
666 acct
= nf_conn_acct_find(ct
);
668 struct nf_conn_counter
*counter
= acct
->counter
;
670 atomic64_inc(&counter
[CTINFO2DIR(ctinfo
)].packets
);
671 atomic64_add(len
, &counter
[CTINFO2DIR(ctinfo
)].bytes
);
675 static void nf_ct_acct_merge(struct nf_conn
*ct
, enum ip_conntrack_info ctinfo
,
676 const struct nf_conn
*loser_ct
)
678 struct nf_conn_acct
*acct
;
680 acct
= nf_conn_acct_find(loser_ct
);
682 struct nf_conn_counter
*counter
= acct
->counter
;
685 /* u32 should be fine since we must have seen one packet. */
686 bytes
= atomic64_read(&counter
[CTINFO2DIR(ctinfo
)].bytes
);
687 nf_ct_acct_update(ct
, ctinfo
, bytes
);
691 /* Resolve race on insertion if this protocol allows this. */
692 static int nf_ct_resolve_clash(struct net
*net
, struct sk_buff
*skb
,
693 enum ip_conntrack_info ctinfo
,
694 struct nf_conntrack_tuple_hash
*h
)
696 /* This is the conntrack entry already in hashes that won race. */
697 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
698 struct nf_conntrack_l4proto
*l4proto
;
700 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
701 if (l4proto
->allow_clash
&&
702 ((ct
->status
& IPS_NAT_DONE_MASK
) == 0) &&
703 !nf_ct_is_dying(ct
) &&
704 atomic_inc_not_zero(&ct
->ct_general
.use
)) {
705 enum ip_conntrack_info oldinfo
;
706 struct nf_conn
*loser_ct
= nf_ct_get(skb
, &oldinfo
);
708 nf_ct_acct_merge(ct
, ctinfo
, loser_ct
);
709 nf_conntrack_put(&loser_ct
->ct_general
);
710 nf_ct_set(skb
, ct
, oldinfo
);
713 NF_CT_STAT_INC(net
, drop
);
717 /* Confirm a connection given skb; places it in hash table */
719 __nf_conntrack_confirm(struct sk_buff
*skb
)
721 const struct nf_conntrack_zone
*zone
;
722 unsigned int hash
, reply_hash
;
723 struct nf_conntrack_tuple_hash
*h
;
725 struct nf_conn_help
*help
;
726 struct nf_conn_tstamp
*tstamp
;
727 struct hlist_nulls_node
*n
;
728 enum ip_conntrack_info ctinfo
;
730 unsigned int sequence
;
733 ct
= nf_ct_get(skb
, &ctinfo
);
736 /* ipt_REJECT uses nf_conntrack_attach to attach related
737 ICMP/TCP RST packets in other direction. Actual packet
738 which created connection will be IP_CT_NEW or for an
739 expected connection, IP_CT_RELATED. */
740 if (CTINFO2DIR(ctinfo
) != IP_CT_DIR_ORIGINAL
)
743 zone
= nf_ct_zone(ct
);
747 sequence
= read_seqcount_begin(&nf_conntrack_generation
);
748 /* reuse the hash saved before */
749 hash
= *(unsigned long *)&ct
->tuplehash
[IP_CT_DIR_REPLY
].hnnode
.pprev
;
750 hash
= scale_hash(hash
);
751 reply_hash
= hash_conntrack(net
,
752 &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
);
754 } while (nf_conntrack_double_lock(net
, hash
, reply_hash
, sequence
));
756 /* We're not in hash table, and we refuse to set up related
757 * connections for unconfirmed conns. But packet copies and
758 * REJECT will give spurious warnings here.
760 /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
762 /* No external references means no one else could have
765 NF_CT_ASSERT(!nf_ct_is_confirmed(ct
));
766 pr_debug("Confirming conntrack %p\n", ct
);
767 /* We have to check the DYING flag after unlink to prevent
768 * a race against nf_ct_get_next_corpse() possibly called from
769 * user context, else we insert an already 'dead' hash, blocking
770 * further use of that particular connection -JM.
772 nf_ct_del_from_dying_or_unconfirmed_list(ct
);
774 if (unlikely(nf_ct_is_dying(ct
))) {
775 nf_ct_add_to_dying_list(ct
);
779 /* See if there's one in the list already, including reverse:
780 NAT could have grabbed it without realizing, since we're
781 not in the hash. If there is, we lost race. */
782 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[hash
], hnnode
)
783 if (nf_ct_key_equal(h
, &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
787 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[reply_hash
], hnnode
)
788 if (nf_ct_key_equal(h
, &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
,
792 /* Timer relative to confirmation time, not original
793 setting time, otherwise we'd get timer wrap in
794 weird delay cases. */
795 ct
->timeout
+= nfct_time_stamp
;
796 atomic_inc(&ct
->ct_general
.use
);
797 ct
->status
|= IPS_CONFIRMED
;
799 /* set conntrack timestamp, if enabled. */
800 tstamp
= nf_conn_tstamp_find(ct
);
802 if (skb
->tstamp
== 0)
803 __net_timestamp(skb
);
805 tstamp
->start
= ktime_to_ns(skb
->tstamp
);
807 /* Since the lookup is lockless, hash insertion must be done after
808 * starting the timer and setting the CONFIRMED bit. The RCU barriers
809 * guarantee that no other CPU can find the conntrack before the above
810 * stores are visible.
812 __nf_conntrack_hash_insert(ct
, hash
, reply_hash
);
813 nf_conntrack_double_unlock(hash
, reply_hash
);
816 help
= nfct_help(ct
);
817 if (help
&& help
->helper
)
818 nf_conntrack_event_cache(IPCT_HELPER
, ct
);
820 nf_conntrack_event_cache(master_ct(ct
) ?
821 IPCT_RELATED
: IPCT_NEW
, ct
);
825 nf_ct_add_to_dying_list(ct
);
826 ret
= nf_ct_resolve_clash(net
, skb
, ctinfo
, h
);
828 nf_conntrack_double_unlock(hash
, reply_hash
);
829 NF_CT_STAT_INC(net
, insert_failed
);
833 EXPORT_SYMBOL_GPL(__nf_conntrack_confirm
);
835 /* Returns true if a connection correspondings to the tuple (required
838 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple
*tuple
,
839 const struct nf_conn
*ignored_conntrack
)
841 struct net
*net
= nf_ct_net(ignored_conntrack
);
842 const struct nf_conntrack_zone
*zone
;
843 struct nf_conntrack_tuple_hash
*h
;
844 struct hlist_nulls_head
*ct_hash
;
845 unsigned int hash
, hsize
;
846 struct hlist_nulls_node
*n
;
849 zone
= nf_ct_zone(ignored_conntrack
);
853 nf_conntrack_get_ht(&ct_hash
, &hsize
);
854 hash
= __hash_conntrack(net
, tuple
, hsize
);
856 hlist_nulls_for_each_entry_rcu(h
, n
, &ct_hash
[hash
], hnnode
) {
857 ct
= nf_ct_tuplehash_to_ctrack(h
);
859 if (ct
== ignored_conntrack
)
862 if (nf_ct_is_expired(ct
)) {
863 nf_ct_gc_expired(ct
);
867 if (nf_ct_key_equal(h
, tuple
, zone
, net
)) {
868 NF_CT_STAT_INC_ATOMIC(net
, found
);
874 if (get_nulls_value(n
) != hash
) {
875 NF_CT_STAT_INC_ATOMIC(net
, search_restart
);
883 EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken
);
885 #define NF_CT_EVICTION_RANGE 8
887 /* There's a small race here where we may free a just-assured
888 connection. Too bad: we're in trouble anyway. */
889 static unsigned int early_drop_list(struct net
*net
,
890 struct hlist_nulls_head
*head
)
892 struct nf_conntrack_tuple_hash
*h
;
893 struct hlist_nulls_node
*n
;
894 unsigned int drops
= 0;
897 hlist_nulls_for_each_entry_rcu(h
, n
, head
, hnnode
) {
898 tmp
= nf_ct_tuplehash_to_ctrack(h
);
900 if (nf_ct_is_expired(tmp
)) {
901 nf_ct_gc_expired(tmp
);
905 if (test_bit(IPS_ASSURED_BIT
, &tmp
->status
) ||
906 !net_eq(nf_ct_net(tmp
), net
) ||
910 if (!atomic_inc_not_zero(&tmp
->ct_general
.use
))
913 /* kill only if still in same netns -- might have moved due to
914 * SLAB_TYPESAFE_BY_RCU rules.
916 * We steal the timer reference. If that fails timer has
917 * already fired or someone else deleted it. Just drop ref
918 * and move to next entry.
920 if (net_eq(nf_ct_net(tmp
), net
) &&
921 nf_ct_is_confirmed(tmp
) &&
922 nf_ct_delete(tmp
, 0, 0))
931 static noinline
int early_drop(struct net
*net
, unsigned int _hash
)
935 for (i
= 0; i
< NF_CT_EVICTION_RANGE
; i
++) {
936 struct hlist_nulls_head
*ct_hash
;
937 unsigned int hash
, hsize
, drops
;
940 nf_conntrack_get_ht(&ct_hash
, &hsize
);
941 hash
= reciprocal_scale(_hash
++, hsize
);
943 drops
= early_drop_list(net
, &ct_hash
[hash
]);
947 NF_CT_STAT_ADD_ATOMIC(net
, early_drop
, drops
);
955 static bool gc_worker_skip_ct(const struct nf_conn
*ct
)
957 return !nf_ct_is_confirmed(ct
) || nf_ct_is_dying(ct
);
960 static bool gc_worker_can_early_drop(const struct nf_conn
*ct
)
962 const struct nf_conntrack_l4proto
*l4proto
;
964 if (!test_bit(IPS_ASSURED_BIT
, &ct
->status
))
967 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
968 if (l4proto
->can_early_drop
&& l4proto
->can_early_drop(ct
))
974 static void gc_worker(struct work_struct
*work
)
976 unsigned int min_interval
= max(HZ
/ GC_MAX_BUCKETS_DIV
, 1u);
977 unsigned int i
, goal
, buckets
= 0, expired_count
= 0;
978 unsigned int nf_conntrack_max95
= 0;
979 struct conntrack_gc_work
*gc_work
;
980 unsigned int ratio
, scanned
= 0;
981 unsigned long next_run
;
983 gc_work
= container_of(work
, struct conntrack_gc_work
, dwork
.work
);
985 goal
= nf_conntrack_htable_size
/ GC_MAX_BUCKETS_DIV
;
986 i
= gc_work
->last_bucket
;
987 if (gc_work
->early_drop
)
988 nf_conntrack_max95
= nf_conntrack_max
/ 100u * 95u;
991 struct nf_conntrack_tuple_hash
*h
;
992 struct hlist_nulls_head
*ct_hash
;
993 struct hlist_nulls_node
*n
;
1000 nf_conntrack_get_ht(&ct_hash
, &hashsz
);
1004 hlist_nulls_for_each_entry_rcu(h
, n
, &ct_hash
[i
], hnnode
) {
1007 tmp
= nf_ct_tuplehash_to_ctrack(h
);
1010 if (nf_ct_is_expired(tmp
)) {
1011 nf_ct_gc_expired(tmp
);
1016 if (nf_conntrack_max95
== 0 || gc_worker_skip_ct(tmp
))
1019 net
= nf_ct_net(tmp
);
1020 if (atomic_read(&net
->ct
.count
) < nf_conntrack_max95
)
1023 /* need to take reference to avoid possible races */
1024 if (!atomic_inc_not_zero(&tmp
->ct_general
.use
))
1027 if (gc_worker_skip_ct(tmp
)) {
1032 if (gc_worker_can_early_drop(tmp
))
1038 /* could check get_nulls_value() here and restart if ct
1039 * was moved to another chain. But given gc is best-effort
1040 * we will just continue with next hash slot.
1043 cond_resched_rcu_qs();
1044 } while (++buckets
< goal
);
1046 if (gc_work
->exiting
)
1050 * Eviction will normally happen from the packet path, and not
1051 * from this gc worker.
1053 * This worker is only here to reap expired entries when system went
1054 * idle after a busy period.
1056 * The heuristics below are supposed to balance conflicting goals:
1058 * 1. Minimize time until we notice a stale entry
1059 * 2. Maximize scan intervals to not waste cycles
1061 * Normally, expire ratio will be close to 0.
1063 * As soon as a sizeable fraction of the entries have expired
1064 * increase scan frequency.
1066 ratio
= scanned
? expired_count
* 100 / scanned
: 0;
1067 if (ratio
> GC_EVICT_RATIO
) {
1068 gc_work
->next_gc_run
= min_interval
;
1070 unsigned int max
= GC_MAX_SCAN_JIFFIES
/ GC_MAX_BUCKETS_DIV
;
1072 BUILD_BUG_ON((GC_MAX_SCAN_JIFFIES
/ GC_MAX_BUCKETS_DIV
) == 0);
1074 gc_work
->next_gc_run
+= min_interval
;
1075 if (gc_work
->next_gc_run
> max
)
1076 gc_work
->next_gc_run
= max
;
1079 next_run
= gc_work
->next_gc_run
;
1080 gc_work
->last_bucket
= i
;
1081 gc_work
->early_drop
= false;
1082 queue_delayed_work(system_long_wq
, &gc_work
->dwork
, next_run
);
1085 static void conntrack_gc_work_init(struct conntrack_gc_work
*gc_work
)
1087 INIT_DELAYED_WORK(&gc_work
->dwork
, gc_worker
);
1088 gc_work
->next_gc_run
= HZ
;
1089 gc_work
->exiting
= false;
1092 static struct nf_conn
*
1093 __nf_conntrack_alloc(struct net
*net
,
1094 const struct nf_conntrack_zone
*zone
,
1095 const struct nf_conntrack_tuple
*orig
,
1096 const struct nf_conntrack_tuple
*repl
,
1097 gfp_t gfp
, u32 hash
)
1101 /* We don't want any race condition at early drop stage */
1102 atomic_inc(&net
->ct
.count
);
1104 if (nf_conntrack_max
&&
1105 unlikely(atomic_read(&net
->ct
.count
) > nf_conntrack_max
)) {
1106 if (!early_drop(net
, hash
)) {
1107 if (!conntrack_gc_work
.early_drop
)
1108 conntrack_gc_work
.early_drop
= true;
1109 atomic_dec(&net
->ct
.count
);
1110 net_warn_ratelimited("nf_conntrack: table full, dropping packet\n");
1111 return ERR_PTR(-ENOMEM
);
1116 * Do not use kmem_cache_zalloc(), as this cache uses
1117 * SLAB_TYPESAFE_BY_RCU.
1119 ct
= kmem_cache_alloc(nf_conntrack_cachep
, gfp
);
1123 spin_lock_init(&ct
->lock
);
1124 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
= *orig
;
1125 ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].hnnode
.pprev
= NULL
;
1126 ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
= *repl
;
1127 /* save hash for reusing when confirming */
1128 *(unsigned long *)(&ct
->tuplehash
[IP_CT_DIR_REPLY
].hnnode
.pprev
) = hash
;
1130 write_pnet(&ct
->ct_net
, net
);
1131 memset(&ct
->__nfct_init_offset
[0], 0,
1132 offsetof(struct nf_conn
, proto
) -
1133 offsetof(struct nf_conn
, __nfct_init_offset
[0]));
1135 nf_ct_zone_add(ct
, zone
);
1137 /* Because we use RCU lookups, we set ct_general.use to zero before
1138 * this is inserted in any list.
1140 atomic_set(&ct
->ct_general
.use
, 0);
1143 atomic_dec(&net
->ct
.count
);
1144 return ERR_PTR(-ENOMEM
);
1147 struct nf_conn
*nf_conntrack_alloc(struct net
*net
,
1148 const struct nf_conntrack_zone
*zone
,
1149 const struct nf_conntrack_tuple
*orig
,
1150 const struct nf_conntrack_tuple
*repl
,
1153 return __nf_conntrack_alloc(net
, zone
, orig
, repl
, gfp
, 0);
1155 EXPORT_SYMBOL_GPL(nf_conntrack_alloc
);
1157 void nf_conntrack_free(struct nf_conn
*ct
)
1159 struct net
*net
= nf_ct_net(ct
);
1161 /* A freed object has refcnt == 0, that's
1162 * the golden rule for SLAB_TYPESAFE_BY_RCU
1164 NF_CT_ASSERT(atomic_read(&ct
->ct_general
.use
) == 0);
1166 nf_ct_ext_destroy(ct
);
1168 kmem_cache_free(nf_conntrack_cachep
, ct
);
1169 smp_mb__before_atomic();
1170 atomic_dec(&net
->ct
.count
);
1172 EXPORT_SYMBOL_GPL(nf_conntrack_free
);
1175 /* Allocate a new conntrack: we return -ENOMEM if classification
1176 failed due to stress. Otherwise it really is unclassifiable. */
1177 static noinline
struct nf_conntrack_tuple_hash
*
1178 init_conntrack(struct net
*net
, struct nf_conn
*tmpl
,
1179 const struct nf_conntrack_tuple
*tuple
,
1180 struct nf_conntrack_l3proto
*l3proto
,
1181 struct nf_conntrack_l4proto
*l4proto
,
1182 struct sk_buff
*skb
,
1183 unsigned int dataoff
, u32 hash
)
1186 struct nf_conn_help
*help
;
1187 struct nf_conntrack_tuple repl_tuple
;
1188 struct nf_conntrack_ecache
*ecache
;
1189 struct nf_conntrack_expect
*exp
= NULL
;
1190 const struct nf_conntrack_zone
*zone
;
1191 struct nf_conn_timeout
*timeout_ext
;
1192 struct nf_conntrack_zone tmp
;
1193 unsigned int *timeouts
;
1195 if (!nf_ct_invert_tuple(&repl_tuple
, tuple
, l3proto
, l4proto
)) {
1196 pr_debug("Can't invert tuple.\n");
1200 zone
= nf_ct_zone_tmpl(tmpl
, skb
, &tmp
);
1201 ct
= __nf_conntrack_alloc(net
, zone
, tuple
, &repl_tuple
, GFP_ATOMIC
,
1204 return (struct nf_conntrack_tuple_hash
*)ct
;
1206 if (!nf_ct_add_synproxy(ct
, tmpl
)) {
1207 nf_conntrack_free(ct
);
1208 return ERR_PTR(-ENOMEM
);
1211 timeout_ext
= tmpl
? nf_ct_timeout_find(tmpl
) : NULL
;
1213 timeouts
= nf_ct_timeout_data(timeout_ext
);
1214 if (unlikely(!timeouts
))
1215 timeouts
= l4proto
->get_timeouts(net
);
1217 timeouts
= l4proto
->get_timeouts(net
);
1220 if (!l4proto
->new(ct
, skb
, dataoff
, timeouts
)) {
1221 nf_conntrack_free(ct
);
1222 pr_debug("can't track with proto module\n");
1227 nf_ct_timeout_ext_add(ct
, rcu_dereference(timeout_ext
->timeout
),
1230 nf_ct_acct_ext_add(ct
, GFP_ATOMIC
);
1231 nf_ct_tstamp_ext_add(ct
, GFP_ATOMIC
);
1232 nf_ct_labels_ext_add(ct
);
1234 ecache
= tmpl
? nf_ct_ecache_find(tmpl
) : NULL
;
1235 nf_ct_ecache_ext_add(ct
, ecache
? ecache
->ctmask
: 0,
1236 ecache
? ecache
->expmask
: 0,
1240 if (net
->ct
.expect_count
) {
1241 spin_lock(&nf_conntrack_expect_lock
);
1242 exp
= nf_ct_find_expectation(net
, zone
, tuple
);
1244 pr_debug("expectation arrives ct=%p exp=%p\n",
1246 /* Welcome, Mr. Bond. We've been expecting you... */
1247 __set_bit(IPS_EXPECTED_BIT
, &ct
->status
);
1248 /* exp->master safe, refcnt bumped in nf_ct_find_expectation */
1249 ct
->master
= exp
->master
;
1251 help
= nf_ct_helper_ext_add(ct
, exp
->helper
,
1254 rcu_assign_pointer(help
->helper
, exp
->helper
);
1257 #ifdef CONFIG_NF_CONNTRACK_MARK
1258 ct
->mark
= exp
->master
->mark
;
1260 #ifdef CONFIG_NF_CONNTRACK_SECMARK
1261 ct
->secmark
= exp
->master
->secmark
;
1263 NF_CT_STAT_INC(net
, expect_new
);
1265 spin_unlock(&nf_conntrack_expect_lock
);
1268 __nf_ct_try_assign_helper(ct
, tmpl
, GFP_ATOMIC
);
1270 /* Now it is inserted into the unconfirmed list, bump refcount */
1271 nf_conntrack_get(&ct
->ct_general
);
1272 nf_ct_add_to_unconfirmed_list(ct
);
1278 exp
->expectfn(ct
, exp
);
1279 nf_ct_expect_put(exp
);
1282 return &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
];
1285 /* On success, returns 0, sets skb->_nfct | ctinfo */
1287 resolve_normal_ct(struct net
*net
, struct nf_conn
*tmpl
,
1288 struct sk_buff
*skb
,
1289 unsigned int dataoff
,
1292 struct nf_conntrack_l3proto
*l3proto
,
1293 struct nf_conntrack_l4proto
*l4proto
)
1295 const struct nf_conntrack_zone
*zone
;
1296 struct nf_conntrack_tuple tuple
;
1297 struct nf_conntrack_tuple_hash
*h
;
1298 enum ip_conntrack_info ctinfo
;
1299 struct nf_conntrack_zone tmp
;
1303 if (!nf_ct_get_tuple(skb
, skb_network_offset(skb
),
1304 dataoff
, l3num
, protonum
, net
, &tuple
, l3proto
,
1306 pr_debug("Can't get tuple\n");
1310 /* look for tuple match */
1311 zone
= nf_ct_zone_tmpl(tmpl
, skb
, &tmp
);
1312 hash
= hash_conntrack_raw(&tuple
, net
);
1313 h
= __nf_conntrack_find_get(net
, zone
, &tuple
, hash
);
1315 h
= init_conntrack(net
, tmpl
, &tuple
, l3proto
, l4proto
,
1316 skb
, dataoff
, hash
);
1322 ct
= nf_ct_tuplehash_to_ctrack(h
);
1324 /* It exists; we have (non-exclusive) reference. */
1325 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
) {
1326 ctinfo
= IP_CT_ESTABLISHED_REPLY
;
1328 /* Once we've had two way comms, always ESTABLISHED. */
1329 if (test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
)) {
1330 pr_debug("normal packet for %p\n", ct
);
1331 ctinfo
= IP_CT_ESTABLISHED
;
1332 } else if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
)) {
1333 pr_debug("related packet for %p\n", ct
);
1334 ctinfo
= IP_CT_RELATED
;
1336 pr_debug("new packet for %p\n", ct
);
1340 nf_ct_set(skb
, ct
, ctinfo
);
1345 nf_conntrack_in(struct net
*net
, u_int8_t pf
, unsigned int hooknum
,
1346 struct sk_buff
*skb
)
1348 struct nf_conn
*ct
, *tmpl
;
1349 enum ip_conntrack_info ctinfo
;
1350 struct nf_conntrack_l3proto
*l3proto
;
1351 struct nf_conntrack_l4proto
*l4proto
;
1352 unsigned int *timeouts
;
1353 unsigned int dataoff
;
1357 tmpl
= nf_ct_get(skb
, &ctinfo
);
1358 if (tmpl
|| ctinfo
== IP_CT_UNTRACKED
) {
1359 /* Previously seen (loopback or untracked)? Ignore. */
1360 if ((tmpl
&& !nf_ct_is_template(tmpl
)) ||
1361 ctinfo
== IP_CT_UNTRACKED
) {
1362 NF_CT_STAT_INC_ATOMIC(net
, ignore
);
1368 /* rcu_read_lock()ed by nf_hook_thresh */
1369 l3proto
= __nf_ct_l3proto_find(pf
);
1370 ret
= l3proto
->get_l4proto(skb
, skb_network_offset(skb
),
1371 &dataoff
, &protonum
);
1373 pr_debug("not prepared to track yet or error occurred\n");
1374 NF_CT_STAT_INC_ATOMIC(net
, error
);
1375 NF_CT_STAT_INC_ATOMIC(net
, invalid
);
1380 l4proto
= __nf_ct_l4proto_find(pf
, protonum
);
1382 /* It may be an special packet, error, unclean...
1383 * inverse of the return code tells to the netfilter
1384 * core what to do with the packet. */
1385 if (l4proto
->error
!= NULL
) {
1386 ret
= l4proto
->error(net
, tmpl
, skb
, dataoff
, pf
, hooknum
);
1388 NF_CT_STAT_INC_ATOMIC(net
, error
);
1389 NF_CT_STAT_INC_ATOMIC(net
, invalid
);
1393 /* ICMP[v6] protocol trackers may assign one conntrack. */
1398 ret
= resolve_normal_ct(net
, tmpl
, skb
, dataoff
, pf
, protonum
,
1401 /* Too stressed to deal. */
1402 NF_CT_STAT_INC_ATOMIC(net
, drop
);
1407 ct
= nf_ct_get(skb
, &ctinfo
);
1409 /* Not valid part of a connection */
1410 NF_CT_STAT_INC_ATOMIC(net
, invalid
);
1415 /* Decide what timeout policy we want to apply to this flow. */
1416 timeouts
= nf_ct_timeout_lookup(net
, ct
, l4proto
);
1418 ret
= l4proto
->packet(ct
, skb
, dataoff
, ctinfo
, pf
, hooknum
, timeouts
);
1420 /* Invalid: inverse of the return code tells
1421 * the netfilter core what to do */
1422 pr_debug("nf_conntrack_in: Can't track with proto module\n");
1423 nf_conntrack_put(&ct
->ct_general
);
1425 NF_CT_STAT_INC_ATOMIC(net
, invalid
);
1426 if (ret
== -NF_DROP
)
1427 NF_CT_STAT_INC_ATOMIC(net
, drop
);
1428 /* Special case: TCP tracker reports an attempt to reopen a
1429 * closed/aborted connection. We have to go back and create a
1432 if (ret
== -NF_REPEAT
)
1438 if (ctinfo
== IP_CT_ESTABLISHED_REPLY
&&
1439 !test_and_set_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
))
1440 nf_conntrack_event_cache(IPCT_REPLY
, ct
);
1447 EXPORT_SYMBOL_GPL(nf_conntrack_in
);
1449 bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple
*inverse
,
1450 const struct nf_conntrack_tuple
*orig
)
1455 ret
= nf_ct_invert_tuple(inverse
, orig
,
1456 __nf_ct_l3proto_find(orig
->src
.l3num
),
1457 __nf_ct_l4proto_find(orig
->src
.l3num
,
1458 orig
->dst
.protonum
));
1462 EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr
);
1464 /* Alter reply tuple (maybe alter helper). This is for NAT, and is
1465 implicitly racy: see __nf_conntrack_confirm */
1466 void nf_conntrack_alter_reply(struct nf_conn
*ct
,
1467 const struct nf_conntrack_tuple
*newreply
)
1469 struct nf_conn_help
*help
= nfct_help(ct
);
1471 /* Should be unconfirmed, so not in hash table yet */
1472 NF_CT_ASSERT(!nf_ct_is_confirmed(ct
));
1474 pr_debug("Altering reply tuple of %p to ", ct
);
1475 nf_ct_dump_tuple(newreply
);
1477 ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
= *newreply
;
1478 if (ct
->master
|| (help
&& !hlist_empty(&help
->expectations
)))
1482 __nf_ct_try_assign_helper(ct
, NULL
, GFP_ATOMIC
);
1485 EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply
);
1487 /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
1488 void __nf_ct_refresh_acct(struct nf_conn
*ct
,
1489 enum ip_conntrack_info ctinfo
,
1490 const struct sk_buff
*skb
,
1491 unsigned long extra_jiffies
,
1496 /* Only update if this is not a fixed timeout */
1497 if (test_bit(IPS_FIXED_TIMEOUT_BIT
, &ct
->status
))
1500 /* If not in hash table, timer will not be active yet */
1501 if (nf_ct_is_confirmed(ct
))
1502 extra_jiffies
+= nfct_time_stamp
;
1504 ct
->timeout
= extra_jiffies
;
1507 nf_ct_acct_update(ct
, ctinfo
, skb
->len
);
1509 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct
);
1511 bool nf_ct_kill_acct(struct nf_conn
*ct
,
1512 enum ip_conntrack_info ctinfo
,
1513 const struct sk_buff
*skb
)
1515 nf_ct_acct_update(ct
, ctinfo
, skb
->len
);
1517 return nf_ct_delete(ct
, 0, 0);
1519 EXPORT_SYMBOL_GPL(nf_ct_kill_acct
);
1521 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1523 #include <linux/netfilter/nfnetlink.h>
1524 #include <linux/netfilter/nfnetlink_conntrack.h>
1525 #include <linux/mutex.h>
1527 /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
1528 * in ip_conntrack_core, since we don't want the protocols to autoload
1529 * or depend on ctnetlink */
1530 int nf_ct_port_tuple_to_nlattr(struct sk_buff
*skb
,
1531 const struct nf_conntrack_tuple
*tuple
)
1533 if (nla_put_be16(skb
, CTA_PROTO_SRC_PORT
, tuple
->src
.u
.tcp
.port
) ||
1534 nla_put_be16(skb
, CTA_PROTO_DST_PORT
, tuple
->dst
.u
.tcp
.port
))
1535 goto nla_put_failure
;
1541 EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr
);
1543 const struct nla_policy nf_ct_port_nla_policy
[CTA_PROTO_MAX
+1] = {
1544 [CTA_PROTO_SRC_PORT
] = { .type
= NLA_U16
},
1545 [CTA_PROTO_DST_PORT
] = { .type
= NLA_U16
},
1547 EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy
);
1549 int nf_ct_port_nlattr_to_tuple(struct nlattr
*tb
[],
1550 struct nf_conntrack_tuple
*t
)
1552 if (!tb
[CTA_PROTO_SRC_PORT
] || !tb
[CTA_PROTO_DST_PORT
])
1555 t
->src
.u
.tcp
.port
= nla_get_be16(tb
[CTA_PROTO_SRC_PORT
]);
1556 t
->dst
.u
.tcp
.port
= nla_get_be16(tb
[CTA_PROTO_DST_PORT
]);
1560 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple
);
1562 int nf_ct_port_nlattr_tuple_size(void)
1564 return nla_policy_len(nf_ct_port_nla_policy
, CTA_PROTO_MAX
+ 1);
1566 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size
);
1569 /* Used by ipt_REJECT and ip6t_REJECT. */
1570 static void nf_conntrack_attach(struct sk_buff
*nskb
, const struct sk_buff
*skb
)
1573 enum ip_conntrack_info ctinfo
;
1575 /* This ICMP is in reverse direction to the packet which caused it */
1576 ct
= nf_ct_get(skb
, &ctinfo
);
1577 if (CTINFO2DIR(ctinfo
) == IP_CT_DIR_ORIGINAL
)
1578 ctinfo
= IP_CT_RELATED_REPLY
;
1580 ctinfo
= IP_CT_RELATED
;
1582 /* Attach to new skbuff, and increment count */
1583 nf_ct_set(nskb
, ct
, ctinfo
);
1584 nf_conntrack_get(skb_nfct(nskb
));
1587 /* Bring out ya dead! */
1588 static struct nf_conn
*
1589 get_next_corpse(int (*iter
)(struct nf_conn
*i
, void *data
),
1590 void *data
, unsigned int *bucket
)
1592 struct nf_conntrack_tuple_hash
*h
;
1594 struct hlist_nulls_node
*n
;
1597 for (; *bucket
< nf_conntrack_htable_size
; (*bucket
)++) {
1598 lockp
= &nf_conntrack_locks
[*bucket
% CONNTRACK_LOCKS
];
1600 nf_conntrack_lock(lockp
);
1601 if (*bucket
< nf_conntrack_htable_size
) {
1602 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[*bucket
], hnnode
) {
1603 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
1605 ct
= nf_ct_tuplehash_to_ctrack(h
);
1617 atomic_inc(&ct
->ct_general
.use
);
1623 static void nf_ct_iterate_cleanup(int (*iter
)(struct nf_conn
*i
, void *data
),
1624 void *data
, u32 portid
, int report
)
1626 unsigned int bucket
= 0, sequence
;
1632 sequence
= read_seqcount_begin(&nf_conntrack_generation
);
1634 while ((ct
= get_next_corpse(iter
, data
, &bucket
)) != NULL
) {
1635 /* Time to push up daises... */
1637 nf_ct_delete(ct
, portid
, report
);
1642 if (!read_seqcount_retry(&nf_conntrack_generation
, sequence
))
1649 int (*iter
)(struct nf_conn
*i
, void *data
);
1654 static int iter_net_only(struct nf_conn
*i
, void *data
)
1656 struct iter_data
*d
= data
;
1658 if (!net_eq(d
->net
, nf_ct_net(i
)))
1661 return d
->iter(i
, d
->data
);
1665 __nf_ct_unconfirmed_destroy(struct net
*net
)
1669 for_each_possible_cpu(cpu
) {
1670 struct nf_conntrack_tuple_hash
*h
;
1671 struct hlist_nulls_node
*n
;
1672 struct ct_pcpu
*pcpu
;
1674 pcpu
= per_cpu_ptr(net
->ct
.pcpu_lists
, cpu
);
1676 spin_lock_bh(&pcpu
->lock
);
1677 hlist_nulls_for_each_entry(h
, n
, &pcpu
->unconfirmed
, hnnode
) {
1680 ct
= nf_ct_tuplehash_to_ctrack(h
);
1682 /* we cannot call iter() on unconfirmed list, the
1683 * owning cpu can reallocate ct->ext at any time.
1685 set_bit(IPS_DYING_BIT
, &ct
->status
);
1687 spin_unlock_bh(&pcpu
->lock
);
1692 void nf_ct_iterate_cleanup_net(struct net
*net
,
1693 int (*iter
)(struct nf_conn
*i
, void *data
),
1694 void *data
, u32 portid
, int report
)
1700 if (atomic_read(&net
->ct
.count
) == 0)
1703 __nf_ct_unconfirmed_destroy(net
);
1711 nf_ct_iterate_cleanup(iter_net_only
, &d
, portid
, report
);
1713 EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup_net
);
1716 * nf_ct_iterate_destroy - destroy unconfirmed conntracks and iterate table
1717 * @iter: callback to invoke for each conntrack
1718 * @data: data to pass to @iter
1720 * Like nf_ct_iterate_cleanup, but first marks conntracks on the
1721 * unconfirmed list as dying (so they will not be inserted into
1724 * Can only be called in module exit path.
1727 nf_ct_iterate_destroy(int (*iter
)(struct nf_conn
*i
, void *data
), void *data
)
1733 if (atomic_read(&net
->ct
.count
) == 0)
1735 __nf_ct_unconfirmed_destroy(net
);
1739 /* Need to wait for netns cleanup worker to finish, if its
1740 * running -- it might have deleted a net namespace from
1741 * the global list, so our __nf_ct_unconfirmed_destroy() might
1742 * not have affected all namespaces.
1746 /* a conntrack could have been unlinked from unconfirmed list
1747 * before we grabbed pcpu lock in __nf_ct_unconfirmed_destroy().
1748 * This makes sure its inserted into conntrack table.
1752 nf_ct_iterate_cleanup(iter
, data
, 0, 0);
1754 EXPORT_SYMBOL_GPL(nf_ct_iterate_destroy
);
1756 static int kill_all(struct nf_conn
*i
, void *data
)
1758 return net_eq(nf_ct_net(i
), data
);
1761 void nf_ct_free_hashtable(void *hash
, unsigned int size
)
1763 if (is_vmalloc_addr(hash
))
1766 free_pages((unsigned long)hash
,
1767 get_order(sizeof(struct hlist_head
) * size
));
1769 EXPORT_SYMBOL_GPL(nf_ct_free_hashtable
);
1771 void nf_conntrack_cleanup_start(void)
1773 conntrack_gc_work
.exiting
= true;
1774 RCU_INIT_POINTER(ip_ct_attach
, NULL
);
1777 void nf_conntrack_cleanup_end(void)
1779 RCU_INIT_POINTER(nf_ct_destroy
, NULL
);
1781 cancel_delayed_work_sync(&conntrack_gc_work
.dwork
);
1782 nf_ct_free_hashtable(nf_conntrack_hash
, nf_conntrack_htable_size
);
1784 nf_conntrack_proto_fini();
1785 nf_conntrack_seqadj_fini();
1786 nf_conntrack_labels_fini();
1787 nf_conntrack_helper_fini();
1788 nf_conntrack_timeout_fini();
1789 nf_conntrack_ecache_fini();
1790 nf_conntrack_tstamp_fini();
1791 nf_conntrack_acct_fini();
1792 nf_conntrack_expect_fini();
1794 kmem_cache_destroy(nf_conntrack_cachep
);
1798 * Mishearing the voices in his head, our hero wonders how he's
1799 * supposed to kill the mall.
1801 void nf_conntrack_cleanup_net(struct net
*net
)
1805 list_add(&net
->exit_list
, &single
);
1806 nf_conntrack_cleanup_net_list(&single
);
1809 void nf_conntrack_cleanup_net_list(struct list_head
*net_exit_list
)
1815 * This makes sure all current packets have passed through
1816 * netfilter framework. Roll on, two-stage module
1822 list_for_each_entry(net
, net_exit_list
, exit_list
) {
1823 nf_ct_iterate_cleanup(kill_all
, net
, 0, 0);
1824 if (atomic_read(&net
->ct
.count
) != 0)
1829 goto i_see_dead_people
;
1832 list_for_each_entry(net
, net_exit_list
, exit_list
) {
1833 nf_conntrack_proto_pernet_fini(net
);
1834 nf_conntrack_helper_pernet_fini(net
);
1835 nf_conntrack_ecache_pernet_fini(net
);
1836 nf_conntrack_tstamp_pernet_fini(net
);
1837 nf_conntrack_acct_pernet_fini(net
);
1838 nf_conntrack_expect_pernet_fini(net
);
1839 free_percpu(net
->ct
.stat
);
1840 free_percpu(net
->ct
.pcpu_lists
);
1844 void *nf_ct_alloc_hashtable(unsigned int *sizep
, int nulls
)
1846 struct hlist_nulls_head
*hash
;
1847 unsigned int nr_slots
, i
;
1850 if (*sizep
> (UINT_MAX
/ sizeof(struct hlist_nulls_head
)))
1853 BUILD_BUG_ON(sizeof(struct hlist_nulls_head
) != sizeof(struct hlist_head
));
1854 nr_slots
= *sizep
= roundup(*sizep
, PAGE_SIZE
/ sizeof(struct hlist_nulls_head
));
1856 if (nr_slots
> (UINT_MAX
/ sizeof(struct hlist_nulls_head
)))
1859 sz
= nr_slots
* sizeof(struct hlist_nulls_head
);
1860 hash
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_NOWARN
| __GFP_ZERO
,
1866 for (i
= 0; i
< nr_slots
; i
++)
1867 INIT_HLIST_NULLS_HEAD(&hash
[i
], i
);
1871 EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable
);
1873 int nf_conntrack_hash_resize(unsigned int hashsize
)
1876 unsigned int old_size
;
1877 struct hlist_nulls_head
*hash
, *old_hash
;
1878 struct nf_conntrack_tuple_hash
*h
;
1884 hash
= nf_ct_alloc_hashtable(&hashsize
, 1);
1888 old_size
= nf_conntrack_htable_size
;
1889 if (old_size
== hashsize
) {
1890 nf_ct_free_hashtable(hash
, hashsize
);
1895 nf_conntrack_all_lock();
1896 write_seqcount_begin(&nf_conntrack_generation
);
1898 /* Lookups in the old hash might happen in parallel, which means we
1899 * might get false negatives during connection lookup. New connections
1900 * created because of a false negative won't make it into the hash
1901 * though since that required taking the locks.
1904 for (i
= 0; i
< nf_conntrack_htable_size
; i
++) {
1905 while (!hlist_nulls_empty(&nf_conntrack_hash
[i
])) {
1906 h
= hlist_nulls_entry(nf_conntrack_hash
[i
].first
,
1907 struct nf_conntrack_tuple_hash
, hnnode
);
1908 ct
= nf_ct_tuplehash_to_ctrack(h
);
1909 hlist_nulls_del_rcu(&h
->hnnode
);
1910 bucket
= __hash_conntrack(nf_ct_net(ct
),
1911 &h
->tuple
, hashsize
);
1912 hlist_nulls_add_head_rcu(&h
->hnnode
, &hash
[bucket
]);
1915 old_size
= nf_conntrack_htable_size
;
1916 old_hash
= nf_conntrack_hash
;
1918 nf_conntrack_hash
= hash
;
1919 nf_conntrack_htable_size
= hashsize
;
1921 write_seqcount_end(&nf_conntrack_generation
);
1922 nf_conntrack_all_unlock();
1926 nf_ct_free_hashtable(old_hash
, old_size
);
1930 int nf_conntrack_set_hashsize(const char *val
, struct kernel_param
*kp
)
1932 unsigned int hashsize
;
1935 if (current
->nsproxy
->net_ns
!= &init_net
)
1938 /* On boot, we can set this without any fancy locking. */
1939 if (!nf_conntrack_htable_size
)
1940 return param_set_uint(val
, kp
);
1942 rc
= kstrtouint(val
, 0, &hashsize
);
1946 return nf_conntrack_hash_resize(hashsize
);
1948 EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize
);
1950 module_param_call(hashsize
, nf_conntrack_set_hashsize
, param_get_uint
,
1951 &nf_conntrack_htable_size
, 0600);
1953 static __always_inline
unsigned int total_extension_size(void)
1955 /* remember to add new extensions below */
1956 BUILD_BUG_ON(NF_CT_EXT_NUM
> 9);
1958 return sizeof(struct nf_ct_ext
) +
1959 sizeof(struct nf_conn_help
)
1960 #if IS_ENABLED(CONFIG_NF_NAT)
1961 + sizeof(struct nf_conn_nat
)
1963 + sizeof(struct nf_conn_seqadj
)
1964 + sizeof(struct nf_conn_acct
)
1965 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1966 + sizeof(struct nf_conntrack_ecache
)
1968 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
1969 + sizeof(struct nf_conn_tstamp
)
1971 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1972 + sizeof(struct nf_conn_timeout
)
1974 #ifdef CONFIG_NF_CONNTRACK_LABELS
1975 + sizeof(struct nf_conn_labels
)
1977 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
1978 + sizeof(struct nf_conn_synproxy
)
1983 int nf_conntrack_init_start(void)
1989 /* struct nf_ct_ext uses u8 to store offsets/size */
1990 BUILD_BUG_ON(total_extension_size() > 255u);
1992 seqcount_init(&nf_conntrack_generation
);
1994 for (i
= 0; i
< CONNTRACK_LOCKS
; i
++)
1995 spin_lock_init(&nf_conntrack_locks
[i
]);
1997 if (!nf_conntrack_htable_size
) {
1998 /* Idea from tcp.c: use 1/16384 of memory.
1999 * On i386: 32MB machine has 512 buckets.
2000 * >= 1GB machines have 16384 buckets.
2001 * >= 4GB machines have 65536 buckets.
2003 nf_conntrack_htable_size
2004 = (((totalram_pages
<< PAGE_SHIFT
) / 16384)
2005 / sizeof(struct hlist_head
));
2006 if (totalram_pages
> (4 * (1024 * 1024 * 1024 / PAGE_SIZE
)))
2007 nf_conntrack_htable_size
= 65536;
2008 else if (totalram_pages
> (1024 * 1024 * 1024 / PAGE_SIZE
))
2009 nf_conntrack_htable_size
= 16384;
2010 if (nf_conntrack_htable_size
< 32)
2011 nf_conntrack_htable_size
= 32;
2013 /* Use a max. factor of four by default to get the same max as
2014 * with the old struct list_heads. When a table size is given
2015 * we use the old value of 8 to avoid reducing the max.
2020 nf_conntrack_hash
= nf_ct_alloc_hashtable(&nf_conntrack_htable_size
, 1);
2021 if (!nf_conntrack_hash
)
2024 nf_conntrack_max
= max_factor
* nf_conntrack_htable_size
;
2026 nf_conntrack_cachep
= kmem_cache_create("nf_conntrack",
2027 sizeof(struct nf_conn
),
2029 SLAB_TYPESAFE_BY_RCU
| SLAB_HWCACHE_ALIGN
, NULL
);
2030 if (!nf_conntrack_cachep
)
2033 printk(KERN_INFO
"nf_conntrack version %s (%u buckets, %d max)\n",
2034 NF_CONNTRACK_VERSION
, nf_conntrack_htable_size
,
2037 ret
= nf_conntrack_expect_init();
2041 ret
= nf_conntrack_acct_init();
2045 ret
= nf_conntrack_tstamp_init();
2049 ret
= nf_conntrack_ecache_init();
2053 ret
= nf_conntrack_timeout_init();
2057 ret
= nf_conntrack_helper_init();
2061 ret
= nf_conntrack_labels_init();
2065 ret
= nf_conntrack_seqadj_init();
2069 ret
= nf_conntrack_proto_init();
2073 conntrack_gc_work_init(&conntrack_gc_work
);
2074 queue_delayed_work(system_long_wq
, &conntrack_gc_work
.dwork
, HZ
);
2079 nf_conntrack_seqadj_fini();
2081 nf_conntrack_labels_fini();
2083 nf_conntrack_helper_fini();
2085 nf_conntrack_timeout_fini();
2087 nf_conntrack_ecache_fini();
2089 nf_conntrack_tstamp_fini();
2091 nf_conntrack_acct_fini();
2093 nf_conntrack_expect_fini();
2095 kmem_cache_destroy(nf_conntrack_cachep
);
2097 nf_ct_free_hashtable(nf_conntrack_hash
, nf_conntrack_htable_size
);
2101 void nf_conntrack_init_end(void)
2103 /* For use by REJECT target */
2104 RCU_INIT_POINTER(ip_ct_attach
, nf_conntrack_attach
);
2105 RCU_INIT_POINTER(nf_ct_destroy
, destroy_conntrack
);
2109 * We need to use special "null" values, not used in hash table
2111 #define UNCONFIRMED_NULLS_VAL ((1<<30)+0)
2112 #define DYING_NULLS_VAL ((1<<30)+1)
2113 #define TEMPLATE_NULLS_VAL ((1<<30)+2)
2115 int nf_conntrack_init_net(struct net
*net
)
2120 BUILD_BUG_ON(IP_CT_UNTRACKED
== IP_CT_NUMBER
);
2121 atomic_set(&net
->ct
.count
, 0);
2123 net
->ct
.pcpu_lists
= alloc_percpu(struct ct_pcpu
);
2124 if (!net
->ct
.pcpu_lists
)
2127 for_each_possible_cpu(cpu
) {
2128 struct ct_pcpu
*pcpu
= per_cpu_ptr(net
->ct
.pcpu_lists
, cpu
);
2130 spin_lock_init(&pcpu
->lock
);
2131 INIT_HLIST_NULLS_HEAD(&pcpu
->unconfirmed
, UNCONFIRMED_NULLS_VAL
);
2132 INIT_HLIST_NULLS_HEAD(&pcpu
->dying
, DYING_NULLS_VAL
);
2135 net
->ct
.stat
= alloc_percpu(struct ip_conntrack_stat
);
2137 goto err_pcpu_lists
;
2139 ret
= nf_conntrack_expect_pernet_init(net
);
2142 ret
= nf_conntrack_acct_pernet_init(net
);
2145 ret
= nf_conntrack_tstamp_pernet_init(net
);
2148 ret
= nf_conntrack_ecache_pernet_init(net
);
2151 ret
= nf_conntrack_helper_pernet_init(net
);
2154 ret
= nf_conntrack_proto_pernet_init(net
);
2160 nf_conntrack_helper_pernet_fini(net
);
2162 nf_conntrack_ecache_pernet_fini(net
);
2164 nf_conntrack_tstamp_pernet_fini(net
);
2166 nf_conntrack_acct_pernet_fini(net
);
2168 nf_conntrack_expect_pernet_fini(net
);
2170 free_percpu(net
->ct
.stat
);
2172 free_percpu(net
->ct
.pcpu_lists
);