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>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/types.h>
15 #include <linux/netfilter.h>
16 #include <linux/module.h>
17 #include <linux/sched.h>
18 #include <linux/skbuff.h>
19 #include <linux/proc_fs.h>
20 #include <linux/vmalloc.h>
21 #include <linux/stddef.h>
22 #include <linux/slab.h>
23 #include <linux/random.h>
24 #include <linux/jhash.h>
25 #include <linux/err.h>
26 #include <linux/percpu.h>
27 #include <linux/moduleparam.h>
28 #include <linux/notifier.h>
29 #include <linux/kernel.h>
30 #include <linux/netdevice.h>
31 #include <linux/socket.h>
33 #include <linux/nsproxy.h>
34 #include <linux/rculist_nulls.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_core.h>
42 #include <net/netfilter/nf_conntrack_extend.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_ecache.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_nat.h>
47 #include <net/netfilter/nf_nat_core.h>
49 #define NF_CONNTRACK_VERSION "0.5.0"
51 int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
52 enum nf_nat_manip_type manip,
53 const struct nlattr *attr) __read_mostly;
54 EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
56 DEFINE_SPINLOCK(nf_conntrack_lock);
57 EXPORT_SYMBOL_GPL(nf_conntrack_lock);
59 unsigned int nf_conntrack_htable_size __read_mostly;
60 EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
62 unsigned int nf_conntrack_max __read_mostly;
63 EXPORT_SYMBOL_GPL(nf_conntrack_max);
65 DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
66 EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked);
68 static int nf_conntrack_hash_rnd_initted;
69 static unsigned int nf_conntrack_hash_rnd;
71 static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple,
72 u16 zone, unsigned int size, unsigned int rnd)
77 /* The direction must be ignored, so we hash everything up to the
78 * destination ports (which is a multiple of 4) and treat the last
79 * three bytes manually.
81 n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32);
82 h = jhash2((u32 *)tuple, n,
83 zone ^ rnd ^ (((__force __u16)tuple->dst.u.all << 16) |
84 tuple->dst.protonum));
86 return ((u64)h * size) >> 32;
89 static inline u_int32_t hash_conntrack(const struct net *net, u16 zone,
90 const struct nf_conntrack_tuple *tuple)
92 return __hash_conntrack(tuple, zone, net->ct.htable_size,
93 nf_conntrack_hash_rnd);
97 nf_ct_get_tuple(const struct sk_buff *skb,
102 struct nf_conntrack_tuple *tuple,
103 const struct nf_conntrack_l3proto *l3proto,
104 const struct nf_conntrack_l4proto *l4proto)
106 memset(tuple, 0, sizeof(*tuple));
108 tuple->src.l3num = l3num;
109 if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0)
112 tuple->dst.protonum = protonum;
113 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
115 return l4proto->pkt_to_tuple(skb, dataoff, tuple);
117 EXPORT_SYMBOL_GPL(nf_ct_get_tuple);
119 bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
120 u_int16_t l3num, struct nf_conntrack_tuple *tuple)
122 struct nf_conntrack_l3proto *l3proto;
123 struct nf_conntrack_l4proto *l4proto;
124 unsigned int protoff;
130 l3proto = __nf_ct_l3proto_find(l3num);
131 ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum);
132 if (ret != NF_ACCEPT) {
137 l4proto = __nf_ct_l4proto_find(l3num, protonum);
139 ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple,
145 EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr);
148 nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
149 const struct nf_conntrack_tuple *orig,
150 const struct nf_conntrack_l3proto *l3proto,
151 const struct nf_conntrack_l4proto *l4proto)
153 memset(inverse, 0, sizeof(*inverse));
155 inverse->src.l3num = orig->src.l3num;
156 if (l3proto->invert_tuple(inverse, orig) == 0)
159 inverse->dst.dir = !orig->dst.dir;
161 inverse->dst.protonum = orig->dst.protonum;
162 return l4proto->invert_tuple(inverse, orig);
164 EXPORT_SYMBOL_GPL(nf_ct_invert_tuple);
167 clean_from_lists(struct nf_conn *ct)
169 pr_debug("clean_from_lists(%p)\n", ct);
170 hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
171 hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode);
173 /* Destroy all pending expectations */
174 nf_ct_remove_expectations(ct);
178 destroy_conntrack(struct nf_conntrack *nfct)
180 struct nf_conn *ct = (struct nf_conn *)nfct;
181 struct net *net = nf_ct_net(ct);
182 struct nf_conntrack_l4proto *l4proto;
184 pr_debug("destroy_conntrack(%p)\n", ct);
185 NF_CT_ASSERT(atomic_read(&nfct->use) == 0);
186 NF_CT_ASSERT(!timer_pending(&ct->timeout));
188 /* To make sure we don't get any weird locking issues here:
189 * destroy_conntrack() MUST NOT be called with a write lock
190 * to nf_conntrack_lock!!! -HW */
192 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
193 if (l4proto && l4proto->destroy)
194 l4proto->destroy(ct);
198 spin_lock_bh(&nf_conntrack_lock);
199 /* Expectations will have been removed in clean_from_lists,
200 * except TFTP can create an expectation on the first packet,
201 * before connection is in the list, so we need to clean here,
203 nf_ct_remove_expectations(ct);
205 /* We overload first tuple to link into unconfirmed list. */
206 if (!nf_ct_is_confirmed(ct)) {
207 BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode));
208 hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
211 NF_CT_STAT_INC(net, delete);
212 spin_unlock_bh(&nf_conntrack_lock);
215 nf_ct_put(ct->master);
217 pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct);
218 nf_conntrack_free(ct);
221 void nf_ct_delete_from_lists(struct nf_conn *ct)
223 struct net *net = nf_ct_net(ct);
225 nf_ct_helper_destroy(ct);
226 spin_lock_bh(&nf_conntrack_lock);
227 /* Inside lock so preempt is disabled on module removal path.
228 * Otherwise we can get spurious warnings. */
229 NF_CT_STAT_INC(net, delete_list);
230 clean_from_lists(ct);
231 spin_unlock_bh(&nf_conntrack_lock);
233 EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists);
235 static void death_by_event(unsigned long ul_conntrack)
237 struct nf_conn *ct = (void *)ul_conntrack;
238 struct net *net = nf_ct_net(ct);
240 if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) {
241 /* bad luck, let's retry again */
242 ct->timeout.expires = jiffies +
243 (random32() % net->ct.sysctl_events_retry_timeout);
244 add_timer(&ct->timeout);
247 /* we've got the event delivered, now it's dying */
248 set_bit(IPS_DYING_BIT, &ct->status);
249 spin_lock(&nf_conntrack_lock);
250 hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
251 spin_unlock(&nf_conntrack_lock);
255 void nf_ct_insert_dying_list(struct nf_conn *ct)
257 struct net *net = nf_ct_net(ct);
259 /* add this conntrack to the dying list */
260 spin_lock_bh(&nf_conntrack_lock);
261 hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
263 spin_unlock_bh(&nf_conntrack_lock);
264 /* set a new timer to retry event delivery */
265 setup_timer(&ct->timeout, death_by_event, (unsigned long)ct);
266 ct->timeout.expires = jiffies +
267 (random32() % net->ct.sysctl_events_retry_timeout);
268 add_timer(&ct->timeout);
270 EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list);
272 static void death_by_timeout(unsigned long ul_conntrack)
274 struct nf_conn *ct = (void *)ul_conntrack;
276 if (!test_bit(IPS_DYING_BIT, &ct->status) &&
277 unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) {
278 /* destroy event was not delivered */
279 nf_ct_delete_from_lists(ct);
280 nf_ct_insert_dying_list(ct);
283 set_bit(IPS_DYING_BIT, &ct->status);
284 nf_ct_delete_from_lists(ct);
290 * - Caller must take a reference on returned object
291 * and recheck nf_ct_tuple_equal(tuple, &h->tuple)
293 * - Caller must lock nf_conntrack_lock before calling this function
295 struct nf_conntrack_tuple_hash *
296 __nf_conntrack_find(struct net *net, u16 zone,
297 const struct nf_conntrack_tuple *tuple)
299 struct nf_conntrack_tuple_hash *h;
300 struct hlist_nulls_node *n;
301 unsigned int hash = hash_conntrack(net, zone, tuple);
303 /* Disable BHs the entire time since we normally need to disable them
304 * at least once for the stats anyway.
308 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
309 if (nf_ct_tuple_equal(tuple, &h->tuple) &&
310 nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) {
311 NF_CT_STAT_INC(net, found);
315 NF_CT_STAT_INC(net, searched);
318 * if the nulls value we got at the end of this lookup is
319 * not the expected one, we must restart lookup.
320 * We probably met an item that was moved to another chain.
322 if (get_nulls_value(n) != hash) {
323 NF_CT_STAT_INC(net, search_restart);
330 EXPORT_SYMBOL_GPL(__nf_conntrack_find);
332 /* Find a connection corresponding to a tuple. */
333 struct nf_conntrack_tuple_hash *
334 nf_conntrack_find_get(struct net *net, u16 zone,
335 const struct nf_conntrack_tuple *tuple)
337 struct nf_conntrack_tuple_hash *h;
342 h = __nf_conntrack_find(net, zone, tuple);
344 ct = nf_ct_tuplehash_to_ctrack(h);
345 if (unlikely(nf_ct_is_dying(ct) ||
346 !atomic_inc_not_zero(&ct->ct_general.use)))
349 if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) ||
350 nf_ct_zone(ct) != zone)) {
360 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
362 static void __nf_conntrack_hash_insert(struct nf_conn *ct,
364 unsigned int repl_hash)
366 struct net *net = nf_ct_net(ct);
368 hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
369 &net->ct.hash[hash]);
370 hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
371 &net->ct.hash[repl_hash]);
374 void nf_conntrack_hash_insert(struct nf_conn *ct)
376 struct net *net = nf_ct_net(ct);
377 unsigned int hash, repl_hash;
380 zone = nf_ct_zone(ct);
381 hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
382 repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
384 __nf_conntrack_hash_insert(ct, hash, repl_hash);
386 EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
388 /* Confirm a connection given skb; places it in hash table */
390 __nf_conntrack_confirm(struct sk_buff *skb)
392 unsigned int hash, repl_hash;
393 struct nf_conntrack_tuple_hash *h;
395 struct nf_conn_help *help;
396 struct hlist_nulls_node *n;
397 enum ip_conntrack_info ctinfo;
401 ct = nf_ct_get(skb, &ctinfo);
404 /* ipt_REJECT uses nf_conntrack_attach to attach related
405 ICMP/TCP RST packets in other direction. Actual packet
406 which created connection will be IP_CT_NEW or for an
407 expected connection, IP_CT_RELATED. */
408 if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
411 zone = nf_ct_zone(ct);
412 hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
413 repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
415 /* We're not in hash table, and we refuse to set up related
416 connections for unconfirmed conns. But packet copies and
417 REJECT will give spurious warnings here. */
418 /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
420 /* No external references means noone else could have
422 NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
423 pr_debug("Confirming conntrack %p\n", ct);
425 spin_lock_bh(&nf_conntrack_lock);
427 /* We have to check the DYING flag inside the lock to prevent
428 a race against nf_ct_get_next_corpse() possibly called from
429 user context, else we insert an already 'dead' hash, blocking
430 further use of that particular connection -JM */
432 if (unlikely(nf_ct_is_dying(ct))) {
433 spin_unlock_bh(&nf_conntrack_lock);
437 /* See if there's one in the list already, including reverse:
438 NAT could have grabbed it without realizing, since we're
439 not in the hash. If there is, we lost race. */
440 hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
441 if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
443 zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)))
445 hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode)
446 if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
448 zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)))
451 /* Remove from unconfirmed list */
452 hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
454 /* Timer relative to confirmation time, not original
455 setting time, otherwise we'd get timer wrap in
456 weird delay cases. */
457 ct->timeout.expires += jiffies;
458 add_timer(&ct->timeout);
459 atomic_inc(&ct->ct_general.use);
460 set_bit(IPS_CONFIRMED_BIT, &ct->status);
462 /* Since the lookup is lockless, hash insertion must be done after
463 * starting the timer and setting the CONFIRMED bit. The RCU barriers
464 * guarantee that no other CPU can find the conntrack before the above
465 * stores are visible.
467 __nf_conntrack_hash_insert(ct, hash, repl_hash);
468 NF_CT_STAT_INC(net, insert);
469 spin_unlock_bh(&nf_conntrack_lock);
471 help = nfct_help(ct);
472 if (help && help->helper)
473 nf_conntrack_event_cache(IPCT_HELPER, ct);
475 nf_conntrack_event_cache(master_ct(ct) ?
476 IPCT_RELATED : IPCT_NEW, ct);
480 NF_CT_STAT_INC(net, insert_failed);
481 spin_unlock_bh(&nf_conntrack_lock);
484 EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
486 /* Returns true if a connection correspondings to the tuple (required
489 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
490 const struct nf_conn *ignored_conntrack)
492 struct net *net = nf_ct_net(ignored_conntrack);
493 struct nf_conntrack_tuple_hash *h;
494 struct hlist_nulls_node *n;
496 u16 zone = nf_ct_zone(ignored_conntrack);
497 unsigned int hash = hash_conntrack(net, zone, tuple);
499 /* Disable BHs the entire time since we need to disable them at
500 * least once for the stats anyway.
503 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
504 ct = nf_ct_tuplehash_to_ctrack(h);
505 if (ct != ignored_conntrack &&
506 nf_ct_tuple_equal(tuple, &h->tuple) &&
507 nf_ct_zone(ct) == zone) {
508 NF_CT_STAT_INC(net, found);
509 rcu_read_unlock_bh();
512 NF_CT_STAT_INC(net, searched);
514 rcu_read_unlock_bh();
518 EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
520 #define NF_CT_EVICTION_RANGE 8
522 /* There's a small race here where we may free a just-assured
523 connection. Too bad: we're in trouble anyway. */
524 static noinline int early_drop(struct net *net, unsigned int hash)
526 /* Use oldest entry, which is roughly LRU */
527 struct nf_conntrack_tuple_hash *h;
528 struct nf_conn *ct = NULL, *tmp;
529 struct hlist_nulls_node *n;
530 unsigned int i, cnt = 0;
534 for (i = 0; i < net->ct.htable_size; i++) {
535 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash],
537 tmp = nf_ct_tuplehash_to_ctrack(h);
538 if (!test_bit(IPS_ASSURED_BIT, &tmp->status))
544 if (likely(!nf_ct_is_dying(ct) &&
545 atomic_inc_not_zero(&ct->ct_general.use)))
551 if (cnt >= NF_CT_EVICTION_RANGE)
554 hash = (hash + 1) % net->ct.htable_size;
561 if (del_timer(&ct->timeout)) {
562 death_by_timeout((unsigned long)ct);
564 NF_CT_STAT_INC_ATOMIC(net, early_drop);
570 struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone,
571 const struct nf_conntrack_tuple *orig,
572 const struct nf_conntrack_tuple *repl,
577 if (unlikely(!nf_conntrack_hash_rnd_initted)) {
578 get_random_bytes(&nf_conntrack_hash_rnd,
579 sizeof(nf_conntrack_hash_rnd));
580 nf_conntrack_hash_rnd_initted = 1;
583 /* We don't want any race condition at early drop stage */
584 atomic_inc(&net->ct.count);
586 if (nf_conntrack_max &&
587 unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) {
588 unsigned int hash = hash_conntrack(net, zone, orig);
589 if (!early_drop(net, hash)) {
590 atomic_dec(&net->ct.count);
593 "nf_conntrack: table full, dropping"
595 return ERR_PTR(-ENOMEM);
600 * Do not use kmem_cache_zalloc(), as this cache uses
601 * SLAB_DESTROY_BY_RCU.
603 ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp);
605 pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n");
606 atomic_dec(&net->ct.count);
607 return ERR_PTR(-ENOMEM);
610 * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next
611 * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged.
613 memset(&ct->tuplehash[IP_CT_DIR_MAX], 0,
614 sizeof(*ct) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX]));
615 spin_lock_init(&ct->lock);
616 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
617 ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL;
618 ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
619 ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev = NULL;
620 /* Don't set timer yet: wait for confirmation */
621 setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct);
625 #ifdef CONFIG_NF_CONNTRACK_ZONES
627 struct nf_conntrack_zone *nf_ct_zone;
629 nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC);
632 nf_ct_zone->id = zone;
636 * changes to lookup keys must be done before setting refcnt to 1
639 atomic_set(&ct->ct_general.use, 1);
642 #ifdef CONFIG_NF_CONNTRACK_ZONES
644 kmem_cache_free(net->ct.nf_conntrack_cachep, ct);
645 return ERR_PTR(-ENOMEM);
648 EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
650 void nf_conntrack_free(struct nf_conn *ct)
652 struct net *net = nf_ct_net(ct);
654 nf_ct_ext_destroy(ct);
655 atomic_dec(&net->ct.count);
657 kmem_cache_free(net->ct.nf_conntrack_cachep, ct);
659 EXPORT_SYMBOL_GPL(nf_conntrack_free);
661 /* Allocate a new conntrack: we return -ENOMEM if classification
662 failed due to stress. Otherwise it really is unclassifiable. */
663 static struct nf_conntrack_tuple_hash *
664 init_conntrack(struct net *net, struct nf_conn *tmpl,
665 const struct nf_conntrack_tuple *tuple,
666 struct nf_conntrack_l3proto *l3proto,
667 struct nf_conntrack_l4proto *l4proto,
669 unsigned int dataoff)
672 struct nf_conn_help *help;
673 struct nf_conntrack_tuple repl_tuple;
674 struct nf_conntrack_ecache *ecache;
675 struct nf_conntrack_expect *exp;
676 u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;
678 if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) {
679 pr_debug("Can't invert tuple.\n");
683 ct = nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC);
685 pr_debug("Can't allocate conntrack.\n");
686 return (struct nf_conntrack_tuple_hash *)ct;
689 if (!l4proto->new(ct, skb, dataoff)) {
690 nf_conntrack_free(ct);
691 pr_debug("init conntrack: can't track with proto module\n");
695 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
697 ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL;
698 nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0,
699 ecache ? ecache->expmask : 0,
702 spin_lock_bh(&nf_conntrack_lock);
703 exp = nf_ct_find_expectation(net, zone, tuple);
705 pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
707 /* Welcome, Mr. Bond. We've been expecting you... */
708 __set_bit(IPS_EXPECTED_BIT, &ct->status);
709 ct->master = exp->master;
711 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
713 rcu_assign_pointer(help->helper, exp->helper);
716 #ifdef CONFIG_NF_CONNTRACK_MARK
717 ct->mark = exp->master->mark;
719 #ifdef CONFIG_NF_CONNTRACK_SECMARK
720 ct->secmark = exp->master->secmark;
722 nf_conntrack_get(&ct->master->ct_general);
723 NF_CT_STAT_INC(net, expect_new);
725 __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC);
726 NF_CT_STAT_INC(net, new);
729 /* Overload tuple linked list to put us in unconfirmed list. */
730 hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
731 &net->ct.unconfirmed);
733 spin_unlock_bh(&nf_conntrack_lock);
737 exp->expectfn(ct, exp);
738 nf_ct_expect_put(exp);
741 return &ct->tuplehash[IP_CT_DIR_ORIGINAL];
744 /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
745 static inline struct nf_conn *
746 resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
748 unsigned int dataoff,
751 struct nf_conntrack_l3proto *l3proto,
752 struct nf_conntrack_l4proto *l4proto,
754 enum ip_conntrack_info *ctinfo)
756 struct nf_conntrack_tuple tuple;
757 struct nf_conntrack_tuple_hash *h;
759 u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;
761 if (!nf_ct_get_tuple(skb, skb_network_offset(skb),
762 dataoff, l3num, protonum, &tuple, l3proto,
764 pr_debug("resolve_normal_ct: Can't get tuple\n");
768 /* look for tuple match */
769 h = nf_conntrack_find_get(net, zone, &tuple);
771 h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto,
778 ct = nf_ct_tuplehash_to_ctrack(h);
780 /* It exists; we have (non-exclusive) reference. */
781 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) {
782 *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY;
783 /* Please set reply bit if this packet OK */
786 /* Once we've had two way comms, always ESTABLISHED. */
787 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
788 pr_debug("nf_conntrack_in: normal packet for %p\n", ct);
789 *ctinfo = IP_CT_ESTABLISHED;
790 } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
791 pr_debug("nf_conntrack_in: related packet for %p\n",
793 *ctinfo = IP_CT_RELATED;
795 pr_debug("nf_conntrack_in: new packet for %p\n", ct);
800 skb->nfct = &ct->ct_general;
801 skb->nfctinfo = *ctinfo;
806 nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
809 struct nf_conn *ct, *tmpl = NULL;
810 enum ip_conntrack_info ctinfo;
811 struct nf_conntrack_l3proto *l3proto;
812 struct nf_conntrack_l4proto *l4proto;
813 unsigned int dataoff;
819 /* Previously seen (loopback or untracked)? Ignore. */
820 tmpl = (struct nf_conn *)skb->nfct;
821 if (!nf_ct_is_template(tmpl)) {
822 NF_CT_STAT_INC_ATOMIC(net, ignore);
828 /* rcu_read_lock()ed by nf_hook_slow */
829 l3proto = __nf_ct_l3proto_find(pf);
830 ret = l3proto->get_l4proto(skb, skb_network_offset(skb),
831 &dataoff, &protonum);
833 pr_debug("not prepared to track yet or error occured\n");
834 NF_CT_STAT_INC_ATOMIC(net, error);
835 NF_CT_STAT_INC_ATOMIC(net, invalid);
840 l4proto = __nf_ct_l4proto_find(pf, protonum);
842 /* It may be an special packet, error, unclean...
843 * inverse of the return code tells to the netfilter
844 * core what to do with the packet. */
845 if (l4proto->error != NULL) {
846 ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo,
849 NF_CT_STAT_INC_ATOMIC(net, error);
850 NF_CT_STAT_INC_ATOMIC(net, invalid);
856 ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum,
857 l3proto, l4proto, &set_reply, &ctinfo);
859 /* Not valid part of a connection */
860 NF_CT_STAT_INC_ATOMIC(net, invalid);
866 /* Too stressed to deal. */
867 NF_CT_STAT_INC_ATOMIC(net, drop);
872 NF_CT_ASSERT(skb->nfct);
874 ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum);
876 /* Invalid: inverse of the return code tells
877 * the netfilter core what to do */
878 pr_debug("nf_conntrack_in: Can't track with proto module\n");
879 nf_conntrack_put(skb->nfct);
881 NF_CT_STAT_INC_ATOMIC(net, invalid);
883 NF_CT_STAT_INC_ATOMIC(net, drop);
888 if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
889 nf_conntrack_event_cache(IPCT_REPLY, ct);
896 EXPORT_SYMBOL_GPL(nf_conntrack_in);
898 bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
899 const struct nf_conntrack_tuple *orig)
904 ret = nf_ct_invert_tuple(inverse, orig,
905 __nf_ct_l3proto_find(orig->src.l3num),
906 __nf_ct_l4proto_find(orig->src.l3num,
907 orig->dst.protonum));
911 EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr);
913 /* Alter reply tuple (maybe alter helper). This is for NAT, and is
914 implicitly racy: see __nf_conntrack_confirm */
915 void nf_conntrack_alter_reply(struct nf_conn *ct,
916 const struct nf_conntrack_tuple *newreply)
918 struct nf_conn_help *help = nfct_help(ct);
920 /* Should be unconfirmed, so not in hash table yet */
921 NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
923 pr_debug("Altering reply tuple of %p to ", ct);
924 nf_ct_dump_tuple(newreply);
926 ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
927 if (ct->master || (help && !hlist_empty(&help->expectations)))
931 __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
934 EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
936 /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
937 void __nf_ct_refresh_acct(struct nf_conn *ct,
938 enum ip_conntrack_info ctinfo,
939 const struct sk_buff *skb,
940 unsigned long extra_jiffies,
943 NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
946 /* Only update if this is not a fixed timeout */
947 if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status))
950 /* If not in hash table, timer will not be active yet */
951 if (!nf_ct_is_confirmed(ct)) {
952 ct->timeout.expires = extra_jiffies;
954 unsigned long newtime = jiffies + extra_jiffies;
956 /* Only update the timeout if the new timeout is at least
957 HZ jiffies from the old timeout. Need del_timer for race
958 avoidance (may already be dying). */
959 if (newtime - ct->timeout.expires >= HZ)
960 mod_timer_pending(&ct->timeout, newtime);
965 struct nf_conn_counter *acct;
967 acct = nf_conn_acct_find(ct);
969 spin_lock_bh(&ct->lock);
970 acct[CTINFO2DIR(ctinfo)].packets++;
971 acct[CTINFO2DIR(ctinfo)].bytes +=
972 skb->len - skb_network_offset(skb);
973 spin_unlock_bh(&ct->lock);
977 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
979 bool __nf_ct_kill_acct(struct nf_conn *ct,
980 enum ip_conntrack_info ctinfo,
981 const struct sk_buff *skb,
985 struct nf_conn_counter *acct;
987 acct = nf_conn_acct_find(ct);
989 spin_lock_bh(&ct->lock);
990 acct[CTINFO2DIR(ctinfo)].packets++;
991 acct[CTINFO2DIR(ctinfo)].bytes +=
992 skb->len - skb_network_offset(skb);
993 spin_unlock_bh(&ct->lock);
997 if (del_timer(&ct->timeout)) {
998 ct->timeout.function((unsigned long)ct);
1003 EXPORT_SYMBOL_GPL(__nf_ct_kill_acct);
1005 #ifdef CONFIG_NF_CONNTRACK_ZONES
1006 static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = {
1007 .len = sizeof(struct nf_conntrack_zone),
1008 .align = __alignof__(struct nf_conntrack_zone),
1009 .id = NF_CT_EXT_ZONE,
1013 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
1015 #include <linux/netfilter/nfnetlink.h>
1016 #include <linux/netfilter/nfnetlink_conntrack.h>
1017 #include <linux/mutex.h>
1019 /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
1020 * in ip_conntrack_core, since we don't want the protocols to autoload
1021 * or depend on ctnetlink */
1022 int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
1023 const struct nf_conntrack_tuple *tuple)
1025 NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port);
1026 NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port);
1032 EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr);
1034 const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = {
1035 [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 },
1036 [CTA_PROTO_DST_PORT] = { .type = NLA_U16 },
1038 EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy);
1040 int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
1041 struct nf_conntrack_tuple *t)
1043 if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT])
1046 t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]);
1047 t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]);
1051 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple);
1053 int nf_ct_port_nlattr_tuple_size(void)
1055 return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
1057 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size);
1060 /* Used by ipt_REJECT and ip6t_REJECT. */
1061 static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
1064 enum ip_conntrack_info ctinfo;
1066 /* This ICMP is in reverse direction to the packet which caused it */
1067 ct = nf_ct_get(skb, &ctinfo);
1068 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
1069 ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY;
1071 ctinfo = IP_CT_RELATED;
1073 /* Attach to new skbuff, and increment count */
1074 nskb->nfct = &ct->ct_general;
1075 nskb->nfctinfo = ctinfo;
1076 nf_conntrack_get(nskb->nfct);
1079 /* Bring out ya dead! */
1080 static struct nf_conn *
1081 get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data),
1082 void *data, unsigned int *bucket)
1084 struct nf_conntrack_tuple_hash *h;
1086 struct hlist_nulls_node *n;
1088 spin_lock_bh(&nf_conntrack_lock);
1089 for (; *bucket < net->ct.htable_size; (*bucket)++) {
1090 hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) {
1091 ct = nf_ct_tuplehash_to_ctrack(h);
1096 hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) {
1097 ct = nf_ct_tuplehash_to_ctrack(h);
1099 set_bit(IPS_DYING_BIT, &ct->status);
1101 spin_unlock_bh(&nf_conntrack_lock);
1104 atomic_inc(&ct->ct_general.use);
1105 spin_unlock_bh(&nf_conntrack_lock);
1109 void nf_ct_iterate_cleanup(struct net *net,
1110 int (*iter)(struct nf_conn *i, void *data),
1114 unsigned int bucket = 0;
1116 while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) {
1117 /* Time to push up daises... */
1118 if (del_timer(&ct->timeout))
1119 death_by_timeout((unsigned long)ct);
1120 /* ... else the timer will get him soon. */
1125 EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup);
1127 struct __nf_ct_flush_report {
1132 static int kill_report(struct nf_conn *i, void *data)
1134 struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data;
1136 /* If we fail to deliver the event, death_by_timeout() will retry */
1137 if (nf_conntrack_event_report(IPCT_DESTROY, i,
1138 fr->pid, fr->report) < 0)
1141 /* Avoid the delivery of the destroy event in death_by_timeout(). */
1142 set_bit(IPS_DYING_BIT, &i->status);
1146 static int kill_all(struct nf_conn *i, void *data)
1151 void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size)
1156 free_pages((unsigned long)hash,
1157 get_order(sizeof(struct hlist_head) * size));
1159 EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
1161 void nf_conntrack_flush_report(struct net *net, u32 pid, int report)
1163 struct __nf_ct_flush_report fr = {
1167 nf_ct_iterate_cleanup(net, kill_report, &fr);
1169 EXPORT_SYMBOL_GPL(nf_conntrack_flush_report);
1171 static void nf_ct_release_dying_list(struct net *net)
1173 struct nf_conntrack_tuple_hash *h;
1175 struct hlist_nulls_node *n;
1177 spin_lock_bh(&nf_conntrack_lock);
1178 hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) {
1179 ct = nf_ct_tuplehash_to_ctrack(h);
1180 /* never fails to remove them, no listeners at this point */
1183 spin_unlock_bh(&nf_conntrack_lock);
1186 static int untrack_refs(void)
1190 for_each_possible_cpu(cpu) {
1191 struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu);
1193 cnt += atomic_read(&ct->ct_general.use) - 1;
1198 static void nf_conntrack_cleanup_init_net(void)
1200 while (untrack_refs() > 0)
1203 nf_conntrack_helper_fini();
1204 nf_conntrack_proto_fini();
1205 #ifdef CONFIG_NF_CONNTRACK_ZONES
1206 nf_ct_extend_unregister(&nf_ct_zone_extend);
1210 static void nf_conntrack_cleanup_net(struct net *net)
1213 nf_ct_iterate_cleanup(net, kill_all, NULL);
1214 nf_ct_release_dying_list(net);
1215 if (atomic_read(&net->ct.count) != 0) {
1217 goto i_see_dead_people;
1220 nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
1221 net->ct.htable_size);
1222 nf_conntrack_ecache_fini(net);
1223 nf_conntrack_acct_fini(net);
1224 nf_conntrack_expect_fini(net);
1225 kmem_cache_destroy(net->ct.nf_conntrack_cachep);
1226 kfree(net->ct.slabname);
1227 free_percpu(net->ct.stat);
1230 /* Mishearing the voices in his head, our hero wonders how he's
1231 supposed to kill the mall. */
1232 void nf_conntrack_cleanup(struct net *net)
1234 if (net_eq(net, &init_net))
1235 rcu_assign_pointer(ip_ct_attach, NULL);
1237 /* This makes sure all current packets have passed through
1238 netfilter framework. Roll on, two-stage module
1242 nf_conntrack_cleanup_net(net);
1244 if (net_eq(net, &init_net)) {
1245 rcu_assign_pointer(nf_ct_destroy, NULL);
1246 nf_conntrack_cleanup_init_net();
1250 void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls)
1252 struct hlist_nulls_head *hash;
1253 unsigned int nr_slots, i;
1258 BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
1259 nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
1260 sz = nr_slots * sizeof(struct hlist_nulls_head);
1261 hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
1265 printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n");
1266 hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
1270 for (i = 0; i < nr_slots; i++)
1271 INIT_HLIST_NULLS_HEAD(&hash[i], i);
1275 EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable);
1277 int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
1279 int i, bucket, vmalloced, old_vmalloced;
1280 unsigned int hashsize, old_size;
1281 struct hlist_nulls_head *hash, *old_hash;
1282 struct nf_conntrack_tuple_hash *h;
1285 if (current->nsproxy->net_ns != &init_net)
1288 /* On boot, we can set this without any fancy locking. */
1289 if (!nf_conntrack_htable_size)
1290 return param_set_uint(val, kp);
1292 hashsize = simple_strtoul(val, NULL, 0);
1296 hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1);
1300 /* Lookups in the old hash might happen in parallel, which means we
1301 * might get false negatives during connection lookup. New connections
1302 * created because of a false negative won't make it into the hash
1303 * though since that required taking the lock.
1305 spin_lock_bh(&nf_conntrack_lock);
1306 for (i = 0; i < init_net.ct.htable_size; i++) {
1307 while (!hlist_nulls_empty(&init_net.ct.hash[i])) {
1308 h = hlist_nulls_entry(init_net.ct.hash[i].first,
1309 struct nf_conntrack_tuple_hash, hnnode);
1310 ct = nf_ct_tuplehash_to_ctrack(h);
1311 hlist_nulls_del_rcu(&h->hnnode);
1312 bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct),
1314 nf_conntrack_hash_rnd);
1315 hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
1318 old_size = init_net.ct.htable_size;
1319 old_vmalloced = init_net.ct.hash_vmalloc;
1320 old_hash = init_net.ct.hash;
1322 init_net.ct.htable_size = nf_conntrack_htable_size = hashsize;
1323 init_net.ct.hash_vmalloc = vmalloced;
1324 init_net.ct.hash = hash;
1325 spin_unlock_bh(&nf_conntrack_lock);
1327 nf_ct_free_hashtable(old_hash, old_vmalloced, old_size);
1330 EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize);
1332 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
1333 &nf_conntrack_htable_size, 0600);
1335 void nf_ct_untracked_status_or(unsigned long bits)
1339 for_each_possible_cpu(cpu)
1340 per_cpu(nf_conntrack_untracked, cpu).status |= bits;
1342 EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or);
1344 static int nf_conntrack_init_init_net(void)
1349 /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB
1350 * machine has 512 buckets. >= 1GB machines have 16384 buckets. */
1351 if (!nf_conntrack_htable_size) {
1352 nf_conntrack_htable_size
1353 = (((totalram_pages << PAGE_SHIFT) / 16384)
1354 / sizeof(struct hlist_head));
1355 if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
1356 nf_conntrack_htable_size = 16384;
1357 if (nf_conntrack_htable_size < 32)
1358 nf_conntrack_htable_size = 32;
1360 /* Use a max. factor of four by default to get the same max as
1361 * with the old struct list_heads. When a table size is given
1362 * we use the old value of 8 to avoid reducing the max.
1366 nf_conntrack_max = max_factor * nf_conntrack_htable_size;
1368 printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n",
1369 NF_CONNTRACK_VERSION, nf_conntrack_htable_size,
1372 ret = nf_conntrack_proto_init();
1376 ret = nf_conntrack_helper_init();
1380 #ifdef CONFIG_NF_CONNTRACK_ZONES
1381 ret = nf_ct_extend_register(&nf_ct_zone_extend);
1385 /* Set up fake conntrack: to never be deleted, not in any hashes */
1386 for_each_possible_cpu(cpu) {
1387 struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu);
1389 write_pnet(&ct->ct_net, &init_net);
1390 atomic_set(&ct->ct_general.use, 1);
1392 /* - and look it like as a confirmed connection */
1393 nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED);
1396 #ifdef CONFIG_NF_CONNTRACK_ZONES
1398 nf_conntrack_helper_fini();
1401 nf_conntrack_proto_fini();
1407 * We need to use special "null" values, not used in hash table
1409 #define UNCONFIRMED_NULLS_VAL ((1<<30)+0)
1410 #define DYING_NULLS_VAL ((1<<30)+1)
1412 static int nf_conntrack_init_net(struct net *net)
1416 atomic_set(&net->ct.count, 0);
1417 INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL);
1418 INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL);
1419 net->ct.stat = alloc_percpu(struct ip_conntrack_stat);
1420 if (!net->ct.stat) {
1425 net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net);
1426 if (!net->ct.slabname) {
1431 net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname,
1432 sizeof(struct nf_conn), 0,
1433 SLAB_DESTROY_BY_RCU, NULL);
1434 if (!net->ct.nf_conntrack_cachep) {
1435 printk(KERN_ERR "Unable to create nf_conn slab cache\n");
1440 net->ct.htable_size = nf_conntrack_htable_size;
1441 net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size,
1442 &net->ct.hash_vmalloc, 1);
1443 if (!net->ct.hash) {
1445 printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
1448 ret = nf_conntrack_expect_init(net);
1451 ret = nf_conntrack_acct_init(net);
1454 ret = nf_conntrack_ecache_init(net);
1461 nf_conntrack_acct_fini(net);
1463 nf_conntrack_expect_fini(net);
1465 nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
1466 net->ct.htable_size);
1468 kmem_cache_destroy(net->ct.nf_conntrack_cachep);
1470 kfree(net->ct.slabname);
1472 free_percpu(net->ct.stat);
1477 s16 (*nf_ct_nat_offset)(const struct nf_conn *ct,
1478 enum ip_conntrack_dir dir,
1480 EXPORT_SYMBOL_GPL(nf_ct_nat_offset);
1482 int nf_conntrack_init(struct net *net)
1486 if (net_eq(net, &init_net)) {
1487 ret = nf_conntrack_init_init_net();
1491 ret = nf_conntrack_init_net(net);
1495 if (net_eq(net, &init_net)) {
1496 /* For use by REJECT target */
1497 rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach);
1498 rcu_assign_pointer(nf_ct_destroy, destroy_conntrack);
1500 /* Howto get NAT offsets */
1501 rcu_assign_pointer(nf_ct_nat_offset, NULL);
1506 if (net_eq(net, &init_net))
1507 nf_conntrack_cleanup_init_net();