Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
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 | |
3 | extension. */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
dc808fe2 | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
9fb9cbb1 | 7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
f229f6ce | 8 | * (C) 2005-2012 Patrick McHardy <kaber@trash.net> |
9fb9cbb1 YK |
9 | * |
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. | |
9fb9cbb1 YK |
13 | */ |
14 | ||
9fb9cbb1 YK |
15 | #include <linux/types.h> |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/module.h> | |
d43c36dc | 18 | #include <linux/sched.h> |
9fb9cbb1 YK |
19 | #include <linux/skbuff.h> |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/stddef.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/random.h> | |
25 | #include <linux/jhash.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/percpu.h> | |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/socket.h> | |
d7fe0f24 | 33 | #include <linux/mm.h> |
d696c7bd | 34 | #include <linux/nsproxy.h> |
ea781f19 | 35 | #include <linux/rculist_nulls.h> |
9fb9cbb1 | 36 | |
9fb9cbb1 YK |
37 | #include <net/netfilter/nf_conntrack.h> |
38 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 39 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 40 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 | 41 | #include <net/netfilter/nf_conntrack_helper.h> |
41d73ec0 | 42 | #include <net/netfilter/nf_conntrack_seqadj.h> |
9fb9cbb1 | 43 | #include <net/netfilter/nf_conntrack_core.h> |
ecfab2c9 | 44 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 45 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 46 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 47 | #include <net/netfilter/nf_conntrack_zones.h> |
a992ca2a | 48 | #include <net/netfilter/nf_conntrack_timestamp.h> |
dd705072 | 49 | #include <net/netfilter/nf_conntrack_timeout.h> |
c539f017 | 50 | #include <net/netfilter/nf_conntrack_labels.h> |
e6a7d3c0 | 51 | #include <net/netfilter/nf_nat.h> |
e17b666a | 52 | #include <net/netfilter/nf_nat_core.h> |
49376368 | 53 | #include <net/netfilter/nf_nat_helper.h> |
9fb9cbb1 | 54 | |
dc808fe2 | 55 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 56 | |
e17b666a PM |
57 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
58 | enum nf_nat_manip_type manip, | |
39938324 | 59 | const struct nlattr *attr) __read_mostly; |
e6a7d3c0 PNA |
60 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
61 | ||
c7232c99 PM |
62 | int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, |
63 | struct nf_conn *ct, | |
64 | enum ip_conntrack_info ctinfo, | |
65 | unsigned int protoff); | |
66 | EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); | |
67 | ||
f8ba1aff | 68 | DEFINE_SPINLOCK(nf_conntrack_lock); |
13b18339 | 69 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
9fb9cbb1 | 70 | |
e2b7606c | 71 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
72 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
73 | ||
e478075c | 74 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 75 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 76 | |
b3c5163f ED |
77 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
78 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 79 | |
f682cefa | 80 | unsigned int nf_conntrack_hash_rnd __read_mostly; |
4d4e61c6 | 81 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
9fb9cbb1 | 82 | |
99f07e91 | 83 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, u16 zone) |
9fb9cbb1 | 84 | { |
0794935e | 85 | unsigned int n; |
0794935e PM |
86 | |
87 | /* The direction must be ignored, so we hash everything up to the | |
88 | * destination ports (which is a multiple of 4) and treat the last | |
89 | * three bytes manually. | |
90 | */ | |
91 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); | |
99f07e91 CG |
92 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
93 | (((__force __u16)tuple->dst.u.all << 16) | | |
94 | tuple->dst.protonum)); | |
95 | } | |
96 | ||
97 | static u32 __hash_bucket(u32 hash, unsigned int size) | |
98 | { | |
99 | return ((u64)hash * size) >> 32; | |
100 | } | |
101 | ||
102 | static u32 hash_bucket(u32 hash, const struct net *net) | |
103 | { | |
104 | return __hash_bucket(hash, net->ct.htable_size); | |
105 | } | |
0794935e | 106 | |
99f07e91 CG |
107 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
108 | u16 zone, unsigned int size) | |
109 | { | |
110 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); | |
9fb9cbb1 YK |
111 | } |
112 | ||
5d0aa2cc | 113 | static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
d696c7bd | 114 | const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 115 | { |
99f07e91 | 116 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
9fb9cbb1 YK |
117 | } |
118 | ||
5f2b4c90 | 119 | bool |
9fb9cbb1 YK |
120 | nf_ct_get_tuple(const struct sk_buff *skb, |
121 | unsigned int nhoff, | |
122 | unsigned int dataoff, | |
123 | u_int16_t l3num, | |
124 | u_int8_t protonum, | |
125 | struct nf_conntrack_tuple *tuple, | |
126 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 127 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 128 | { |
443a70d5 | 129 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
130 | |
131 | tuple->src.l3num = l3num; | |
132 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 133 | return false; |
9fb9cbb1 YK |
134 | |
135 | tuple->dst.protonum = protonum; | |
136 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
137 | ||
605dcad6 | 138 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
9fb9cbb1 | 139 | } |
13b18339 | 140 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 141 | |
5f2b4c90 JE |
142 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
143 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
144 | { |
145 | struct nf_conntrack_l3proto *l3proto; | |
146 | struct nf_conntrack_l4proto *l4proto; | |
147 | unsigned int protoff; | |
148 | u_int8_t protonum; | |
149 | int ret; | |
150 | ||
151 | rcu_read_lock(); | |
152 | ||
153 | l3proto = __nf_ct_l3proto_find(l3num); | |
154 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
155 | if (ret != NF_ACCEPT) { | |
156 | rcu_read_unlock(); | |
5f2b4c90 | 157 | return false; |
e2a3123f YK |
158 | } |
159 | ||
160 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
161 | ||
162 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, | |
163 | l3proto, l4proto); | |
164 | ||
165 | rcu_read_unlock(); | |
166 | return ret; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
169 | ||
5f2b4c90 | 170 | bool |
9fb9cbb1 YK |
171 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
172 | const struct nf_conntrack_tuple *orig, | |
173 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 174 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 175 | { |
443a70d5 | 176 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
177 | |
178 | inverse->src.l3num = orig->src.l3num; | |
179 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 180 | return false; |
9fb9cbb1 YK |
181 | |
182 | inverse->dst.dir = !orig->dst.dir; | |
183 | ||
184 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 185 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 186 | } |
13b18339 | 187 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 188 | |
9fb9cbb1 YK |
189 | static void |
190 | clean_from_lists(struct nf_conn *ct) | |
191 | { | |
0d53778e | 192 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
193 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
194 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
195 | |
196 | /* Destroy all pending expectations */ | |
c1d10adb | 197 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
198 | } |
199 | ||
200 | static void | |
201 | destroy_conntrack(struct nf_conntrack *nfct) | |
202 | { | |
203 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 204 | struct net *net = nf_ct_net(ct); |
605dcad6 | 205 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 206 | |
0d53778e | 207 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 YK |
208 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
209 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
210 | ||
9fb9cbb1 YK |
211 | /* To make sure we don't get any weird locking issues here: |
212 | * destroy_conntrack() MUST NOT be called with a write lock | |
213 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 214 | rcu_read_lock(); |
5e8fbe2a | 215 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
216 | if (l4proto && l4proto->destroy) |
217 | l4proto->destroy(ct); | |
9fb9cbb1 | 218 | |
982d9a9c | 219 | rcu_read_unlock(); |
9fb9cbb1 | 220 | |
f8ba1aff | 221 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
222 | /* Expectations will have been removed in clean_from_lists, |
223 | * except TFTP can create an expectation on the first packet, | |
224 | * before connection is in the list, so we need to clean here, | |
225 | * too. */ | |
c1d10adb | 226 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 227 | |
04dac011 PNA |
228 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
229 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
230 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 | 231 | |
0d55af87 | 232 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 233 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
234 | |
235 | if (ct->master) | |
236 | nf_ct_put(ct->master); | |
237 | ||
0d53778e | 238 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
239 | nf_conntrack_free(ct); |
240 | } | |
241 | ||
02982c27 | 242 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 243 | { |
0d55af87 | 244 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 | 245 | |
9858a3ae | 246 | nf_ct_helper_destroy(ct); |
f8ba1aff | 247 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
248 | /* Inside lock so preempt is disabled on module removal path. |
249 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 250 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 251 | clean_from_lists(ct); |
04dac011 PNA |
252 | /* add this conntrack to the dying list */ |
253 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
254 | &net->ct.dying); | |
f8ba1aff | 255 | spin_unlock_bh(&nf_conntrack_lock); |
dd7669a9 | 256 | } |
dd7669a9 PNA |
257 | |
258 | static void death_by_event(unsigned long ul_conntrack) | |
259 | { | |
260 | struct nf_conn *ct = (void *)ul_conntrack; | |
261 | struct net *net = nf_ct_net(ct); | |
5b423f6a PNA |
262 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
263 | ||
264 | BUG_ON(ecache == NULL); | |
dd7669a9 PNA |
265 | |
266 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { | |
267 | /* bad luck, let's retry again */ | |
5b423f6a | 268 | ecache->timeout.expires = jiffies + |
ca3d41a5 | 269 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
5b423f6a | 270 | add_timer(&ecache->timeout); |
dd7669a9 PNA |
271 | return; |
272 | } | |
273 | /* we've got the event delivered, now it's dying */ | |
274 | set_bit(IPS_DYING_BIT, &ct->status); | |
dd7669a9 PNA |
275 | nf_ct_put(ct); |
276 | } | |
277 | ||
02982c27 | 278 | static void nf_ct_dying_timeout(struct nf_conn *ct) |
dd7669a9 PNA |
279 | { |
280 | struct net *net = nf_ct_net(ct); | |
5b423f6a PNA |
281 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
282 | ||
283 | BUG_ON(ecache == NULL); | |
dd7669a9 | 284 | |
dd7669a9 | 285 | /* set a new timer to retry event delivery */ |
5b423f6a PNA |
286 | setup_timer(&ecache->timeout, death_by_event, (unsigned long)ct); |
287 | ecache->timeout.expires = jiffies + | |
ca3d41a5 | 288 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
5b423f6a | 289 | add_timer(&ecache->timeout); |
dd7669a9 | 290 | } |
dd7669a9 | 291 | |
02982c27 | 292 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 293 | { |
a992ca2a PNA |
294 | struct nf_conn_tstamp *tstamp; |
295 | ||
296 | tstamp = nf_conn_tstamp_find(ct); | |
297 | if (tstamp && tstamp->stop == 0) | |
298 | tstamp->stop = ktime_to_ns(ktime_get_real()); | |
dd7669a9 | 299 | |
02982c27 FW |
300 | if (!nf_ct_is_dying(ct) && |
301 | unlikely(nf_conntrack_event_report(IPCT_DESTROY, ct, | |
302 | portid, report) < 0)) { | |
dd7669a9 PNA |
303 | /* destroy event was not delivered */ |
304 | nf_ct_delete_from_lists(ct); | |
04dac011 | 305 | nf_ct_dying_timeout(ct); |
02982c27 | 306 | return false; |
dd7669a9 PNA |
307 | } |
308 | set_bit(IPS_DYING_BIT, &ct->status); | |
309 | nf_ct_delete_from_lists(ct); | |
9fb9cbb1 | 310 | nf_ct_put(ct); |
02982c27 FW |
311 | return true; |
312 | } | |
313 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
314 | ||
315 | static void death_by_timeout(unsigned long ul_conntrack) | |
316 | { | |
317 | nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0); | |
9fb9cbb1 YK |
318 | } |
319 | ||
ea781f19 ED |
320 | /* |
321 | * Warning : | |
322 | * - Caller must take a reference on returned object | |
323 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
324 | * OR | |
325 | * - Caller must lock nf_conntrack_lock before calling this function | |
326 | */ | |
99f07e91 CG |
327 | static struct nf_conntrack_tuple_hash * |
328 | ____nf_conntrack_find(struct net *net, u16 zone, | |
329 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
330 | { |
331 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 332 | struct hlist_nulls_node *n; |
99f07e91 | 333 | unsigned int bucket = hash_bucket(hash, net); |
9fb9cbb1 | 334 | |
4e29e9ec PM |
335 | /* Disable BHs the entire time since we normally need to disable them |
336 | * at least once for the stats anyway. | |
337 | */ | |
338 | local_bh_disable(); | |
ea781f19 | 339 | begin: |
99f07e91 | 340 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
5d0aa2cc PM |
341 | if (nf_ct_tuple_equal(tuple, &h->tuple) && |
342 | nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { | |
0d55af87 | 343 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 344 | local_bh_enable(); |
9fb9cbb1 YK |
345 | return h; |
346 | } | |
0d55af87 | 347 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 348 | } |
ea781f19 ED |
349 | /* |
350 | * if the nulls value we got at the end of this lookup is | |
351 | * not the expected one, we must restart lookup. | |
352 | * We probably met an item that was moved to another chain. | |
353 | */ | |
99f07e91 | 354 | if (get_nulls_value(n) != bucket) { |
af740b2c | 355 | NF_CT_STAT_INC(net, search_restart); |
ea781f19 | 356 | goto begin; |
af740b2c | 357 | } |
4e29e9ec | 358 | local_bh_enable(); |
9fb9cbb1 YK |
359 | |
360 | return NULL; | |
361 | } | |
99f07e91 CG |
362 | |
363 | struct nf_conntrack_tuple_hash * | |
364 | __nf_conntrack_find(struct net *net, u16 zone, | |
365 | const struct nf_conntrack_tuple *tuple) | |
366 | { | |
367 | return ____nf_conntrack_find(net, zone, tuple, | |
368 | hash_conntrack_raw(tuple, zone)); | |
369 | } | |
13b18339 | 370 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
371 | |
372 | /* Find a connection corresponding to a tuple. */ | |
99f07e91 CG |
373 | static struct nf_conntrack_tuple_hash * |
374 | __nf_conntrack_find_get(struct net *net, u16 zone, | |
375 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
376 | { |
377 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 378 | struct nf_conn *ct; |
9fb9cbb1 | 379 | |
76507f69 | 380 | rcu_read_lock(); |
ea781f19 | 381 | begin: |
99f07e91 | 382 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
383 | if (h) { |
384 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
385 | if (unlikely(nf_ct_is_dying(ct) || |
386 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 387 | h = NULL; |
ea781f19 | 388 | else { |
5d0aa2cc PM |
389 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || |
390 | nf_ct_zone(ct) != zone)) { | |
ea781f19 ED |
391 | nf_ct_put(ct); |
392 | goto begin; | |
393 | } | |
394 | } | |
76507f69 PM |
395 | } |
396 | rcu_read_unlock(); | |
9fb9cbb1 YK |
397 | |
398 | return h; | |
399 | } | |
99f07e91 CG |
400 | |
401 | struct nf_conntrack_tuple_hash * | |
402 | nf_conntrack_find_get(struct net *net, u16 zone, | |
403 | const struct nf_conntrack_tuple *tuple) | |
404 | { | |
405 | return __nf_conntrack_find_get(net, zone, tuple, | |
406 | hash_conntrack_raw(tuple, zone)); | |
407 | } | |
13b18339 | 408 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 409 | |
c1d10adb PNA |
410 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
411 | unsigned int hash, | |
601e68e1 | 412 | unsigned int repl_hash) |
c1d10adb | 413 | { |
400dad39 AD |
414 | struct net *net = nf_ct_net(ct); |
415 | ||
ea781f19 | 416 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 417 | &net->ct.hash[hash]); |
ea781f19 | 418 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 419 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
420 | } |
421 | ||
7d367e06 JK |
422 | int |
423 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 424 | { |
d696c7bd | 425 | struct net *net = nf_ct_net(ct); |
c1d10adb | 426 | unsigned int hash, repl_hash; |
7d367e06 JK |
427 | struct nf_conntrack_tuple_hash *h; |
428 | struct hlist_nulls_node *n; | |
5d0aa2cc | 429 | u16 zone; |
c1d10adb | 430 | |
5d0aa2cc | 431 | zone = nf_ct_zone(ct); |
7d367e06 JK |
432 | hash = hash_conntrack(net, zone, |
433 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
434 | repl_hash = hash_conntrack(net, zone, | |
435 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
436 | ||
437 | spin_lock_bh(&nf_conntrack_lock); | |
438 | ||
439 | /* See if there's one in the list already, including reverse */ | |
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, | |
442 | &h->tuple) && | |
443 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
444 | goto out; | |
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, | |
447 | &h->tuple) && | |
448 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
449 | goto out; | |
c1d10adb | 450 | |
7d367e06 JK |
451 | add_timer(&ct->timeout); |
452 | nf_conntrack_get(&ct->ct_general); | |
c1d10adb | 453 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
7d367e06 JK |
454 | NF_CT_STAT_INC(net, insert); |
455 | spin_unlock_bh(&nf_conntrack_lock); | |
456 | ||
457 | return 0; | |
458 | ||
459 | out: | |
460 | NF_CT_STAT_INC(net, insert_failed); | |
461 | spin_unlock_bh(&nf_conntrack_lock); | |
462 | return -EEXIST; | |
c1d10adb | 463 | } |
7d367e06 | 464 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 465 | |
9fb9cbb1 YK |
466 | /* Confirm a connection given skb; places it in hash table */ |
467 | int | |
3db05fea | 468 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
469 | { |
470 | unsigned int hash, repl_hash; | |
df0933dc | 471 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 472 | struct nf_conn *ct; |
df0933dc | 473 | struct nf_conn_help *help; |
a992ca2a | 474 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 475 | struct hlist_nulls_node *n; |
9fb9cbb1 | 476 | enum ip_conntrack_info ctinfo; |
400dad39 | 477 | struct net *net; |
5d0aa2cc | 478 | u16 zone; |
9fb9cbb1 | 479 | |
3db05fea | 480 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 481 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
482 | |
483 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
484 | ICMP/TCP RST packets in other direction. Actual packet | |
485 | which created connection will be IP_CT_NEW or for an | |
486 | expected connection, IP_CT_RELATED. */ | |
487 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
488 | return NF_ACCEPT; | |
489 | ||
5d0aa2cc | 490 | zone = nf_ct_zone(ct); |
99f07e91 CG |
491 | /* reuse the hash saved before */ |
492 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
493 | hash = hash_bucket(hash, net); | |
494 | repl_hash = hash_conntrack(net, zone, | |
495 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
9fb9cbb1 YK |
496 | |
497 | /* We're not in hash table, and we refuse to set up related | |
498 | connections for unconfirmed conns. But packet copies and | |
499 | REJECT will give spurious warnings here. */ | |
500 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
501 | ||
25985edc | 502 | /* No external references means no one else could have |
9fb9cbb1 YK |
503 | confirmed us. */ |
504 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 505 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 506 | |
f8ba1aff | 507 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 508 | |
fc350777 JM |
509 | /* We have to check the DYING flag inside the lock to prevent |
510 | a race against nf_ct_get_next_corpse() possibly called from | |
511 | user context, else we insert an already 'dead' hash, blocking | |
512 | further use of that particular connection -JM */ | |
513 | ||
514 | if (unlikely(nf_ct_is_dying(ct))) { | |
515 | spin_unlock_bh(&nf_conntrack_lock); | |
516 | return NF_ACCEPT; | |
517 | } | |
518 | ||
9fb9cbb1 YK |
519 | /* See if there's one in the list already, including reverse: |
520 | NAT could have grabbed it without realizing, since we're | |
521 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 522 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc | 523 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
5d0aa2cc PM |
524 | &h->tuple) && |
525 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 526 | goto out; |
ea781f19 | 527 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc | 528 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
5d0aa2cc PM |
529 | &h->tuple) && |
530 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 531 | goto out; |
9fb9cbb1 | 532 | |
df0933dc | 533 | /* Remove from unconfirmed list */ |
ea781f19 | 534 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc | 535 | |
df0933dc PM |
536 | /* Timer relative to confirmation time, not original |
537 | setting time, otherwise we'd get timer wrap in | |
538 | weird delay cases. */ | |
539 | ct->timeout.expires += jiffies; | |
540 | add_timer(&ct->timeout); | |
541 | atomic_inc(&ct->ct_general.use); | |
45eec341 | 542 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 543 | |
a992ca2a PNA |
544 | /* set conntrack timestamp, if enabled. */ |
545 | tstamp = nf_conn_tstamp_find(ct); | |
546 | if (tstamp) { | |
547 | if (skb->tstamp.tv64 == 0) | |
e3192690 | 548 | __net_timestamp(skb); |
a992ca2a PNA |
549 | |
550 | tstamp->start = ktime_to_ns(skb->tstamp); | |
551 | } | |
5c8ec910 PM |
552 | /* Since the lookup is lockless, hash insertion must be done after |
553 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
554 | * guarantee that no other CPU can find the conntrack before the above | |
555 | * stores are visible. | |
556 | */ | |
557 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
0d55af87 | 558 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 559 | spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910 | 560 | |
df0933dc PM |
561 | help = nfct_help(ct); |
562 | if (help && help->helper) | |
a71996fc | 563 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 564 | |
df0933dc | 565 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 566 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 567 | return NF_ACCEPT; |
9fb9cbb1 | 568 | |
df0933dc | 569 | out: |
0d55af87 | 570 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 571 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
572 | return NF_DROP; |
573 | } | |
13b18339 | 574 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
575 | |
576 | /* Returns true if a connection correspondings to the tuple (required | |
577 | for NAT). */ | |
578 | int | |
579 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
580 | const struct nf_conn *ignored_conntrack) | |
581 | { | |
400dad39 | 582 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 583 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 584 | struct hlist_nulls_node *n; |
5d0aa2cc PM |
585 | struct nf_conn *ct; |
586 | u16 zone = nf_ct_zone(ignored_conntrack); | |
587 | unsigned int hash = hash_conntrack(net, zone, tuple); | |
9fb9cbb1 | 588 | |
4e29e9ec PM |
589 | /* Disable BHs the entire time since we need to disable them at |
590 | * least once for the stats anyway. | |
591 | */ | |
592 | rcu_read_lock_bh(); | |
ea781f19 | 593 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
5d0aa2cc PM |
594 | ct = nf_ct_tuplehash_to_ctrack(h); |
595 | if (ct != ignored_conntrack && | |
596 | nf_ct_tuple_equal(tuple, &h->tuple) && | |
597 | nf_ct_zone(ct) == zone) { | |
0d55af87 | 598 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 599 | rcu_read_unlock_bh(); |
ba419aff PM |
600 | return 1; |
601 | } | |
0d55af87 | 602 | NF_CT_STAT_INC(net, searched); |
ba419aff | 603 | } |
4e29e9ec | 604 | rcu_read_unlock_bh(); |
9fb9cbb1 | 605 | |
ba419aff | 606 | return 0; |
9fb9cbb1 | 607 | } |
13b18339 | 608 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 609 | |
7ae7730f PM |
610 | #define NF_CT_EVICTION_RANGE 8 |
611 | ||
9fb9cbb1 YK |
612 | /* There's a small race here where we may free a just-assured |
613 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 614 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 615 | { |
f205c5e0 | 616 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 617 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 618 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 619 | struct hlist_nulls_node *n; |
7ae7730f | 620 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
621 | int dropped = 0; |
622 | ||
76507f69 | 623 | rcu_read_lock(); |
d696c7bd | 624 | for (i = 0; i < net->ct.htable_size; i++) { |
ea781f19 ED |
625 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
626 | hnnode) { | |
7ae7730f PM |
627 | tmp = nf_ct_tuplehash_to_ctrack(h); |
628 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
629 | ct = tmp; | |
630 | cnt++; | |
631 | } | |
76507f69 | 632 | |
5ae27aa2 CG |
633 | if (ct != NULL) { |
634 | if (likely(!nf_ct_is_dying(ct) && | |
635 | atomic_inc_not_zero(&ct->ct_general.use))) | |
636 | break; | |
637 | else | |
638 | ct = NULL; | |
639 | } | |
640 | ||
641 | if (cnt >= NF_CT_EVICTION_RANGE) | |
7ae7730f | 642 | break; |
5ae27aa2 | 643 | |
d696c7bd | 644 | hash = (hash + 1) % net->ct.htable_size; |
9fb9cbb1 | 645 | } |
76507f69 | 646 | rcu_read_unlock(); |
9fb9cbb1 YK |
647 | |
648 | if (!ct) | |
649 | return dropped; | |
650 | ||
651 | if (del_timer(&ct->timeout)) { | |
02982c27 | 652 | if (nf_ct_delete(ct, 0, 0)) { |
74138511 PNA |
653 | dropped = 1; |
654 | NF_CT_STAT_INC_ATOMIC(net, early_drop); | |
655 | } | |
9fb9cbb1 YK |
656 | } |
657 | nf_ct_put(ct); | |
658 | return dropped; | |
659 | } | |
660 | ||
f682cefa CG |
661 | void init_nf_conntrack_hash_rnd(void) |
662 | { | |
663 | unsigned int rand; | |
664 | ||
665 | /* | |
666 | * Why not initialize nf_conntrack_rnd in a "init()" function ? | |
667 | * Because there isn't enough entropy when system initializing, | |
668 | * and we initialize it as late as possible. | |
669 | */ | |
670 | do { | |
671 | get_random_bytes(&rand, sizeof(rand)); | |
672 | } while (!rand); | |
673 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); | |
674 | } | |
675 | ||
99f07e91 CG |
676 | static struct nf_conn * |
677 | __nf_conntrack_alloc(struct net *net, u16 zone, | |
678 | const struct nf_conntrack_tuple *orig, | |
679 | const struct nf_conntrack_tuple *repl, | |
680 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 681 | { |
cd7fcbf1 | 682 | struct nf_conn *ct; |
9fb9cbb1 | 683 | |
b2390969 | 684 | if (unlikely(!nf_conntrack_hash_rnd)) { |
f682cefa | 685 | init_nf_conntrack_hash_rnd(); |
99f07e91 CG |
686 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
687 | hash = hash_conntrack_raw(orig, zone); | |
9fb9cbb1 YK |
688 | } |
689 | ||
5251e2d2 | 690 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 691 | atomic_inc(&net->ct.count); |
5251e2d2 | 692 | |
76eb9460 | 693 | if (nf_conntrack_max && |
49ac8713 | 694 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
99f07e91 | 695 | if (!early_drop(net, hash_bucket(hash, net))) { |
49ac8713 | 696 | atomic_dec(&net->ct.count); |
e87cc472 | 697 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
698 | return ERR_PTR(-ENOMEM); |
699 | } | |
700 | } | |
701 | ||
941297f4 ED |
702 | /* |
703 | * Do not use kmem_cache_zalloc(), as this cache uses | |
704 | * SLAB_DESTROY_BY_RCU. | |
705 | */ | |
5b3501fa | 706 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
c88130bc | 707 | if (ct == NULL) { |
49ac8713 | 708 | atomic_dec(&net->ct.count); |
dacd2a1a | 709 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 710 | } |
941297f4 ED |
711 | /* |
712 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next | |
713 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. | |
714 | */ | |
715 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, | |
e5fc9e7a CG |
716 | offsetof(struct nf_conn, proto) - |
717 | offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); | |
440f0d58 | 718 | spin_lock_init(&ct->lock); |
c88130bc | 719 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 720 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 721 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
722 | /* save hash for reusing when confirming */ |
723 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
9fb9cbb1 | 724 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 725 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9b | 726 | write_pnet(&ct->ct_net, net); |
5d0aa2cc PM |
727 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
728 | if (zone) { | |
729 | struct nf_conntrack_zone *nf_ct_zone; | |
730 | ||
731 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); | |
732 | if (!nf_ct_zone) | |
733 | goto out_free; | |
734 | nf_ct_zone->id = zone; | |
735 | } | |
736 | #endif | |
941297f4 ED |
737 | /* |
738 | * changes to lookup keys must be done before setting refcnt to 1 | |
739 | */ | |
740 | smp_wmb(); | |
741 | atomic_set(&ct->ct_general.use, 1); | |
c88130bc | 742 | return ct; |
5d0aa2cc PM |
743 | |
744 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
745 | out_free: | |
d96fc659 | 746 | atomic_dec(&net->ct.count); |
5d0aa2cc PM |
747 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
748 | return ERR_PTR(-ENOMEM); | |
749 | #endif | |
9fb9cbb1 | 750 | } |
99f07e91 CG |
751 | |
752 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, | |
753 | const struct nf_conntrack_tuple *orig, | |
754 | const struct nf_conntrack_tuple *repl, | |
755 | gfp_t gfp) | |
756 | { | |
757 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
758 | } | |
13b18339 | 759 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 760 | |
c88130bc | 761 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 762 | { |
1d45209d ED |
763 | struct net *net = nf_ct_net(ct); |
764 | ||
ceeff754 | 765 | nf_ct_ext_destroy(ct); |
1d45209d | 766 | atomic_dec(&net->ct.count); |
ea781f19 | 767 | nf_ct_ext_free(ct); |
5b3501fa | 768 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
76507f69 | 769 | } |
13b18339 | 770 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 771 | |
c539f017 | 772 | |
9fb9cbb1 YK |
773 | /* Allocate a new conntrack: we return -ENOMEM if classification |
774 | failed due to stress. Otherwise it really is unclassifiable. */ | |
775 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 776 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 777 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 778 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 779 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 780 | struct sk_buff *skb, |
60b5f8f7 | 781 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 782 | { |
c88130bc | 783 | struct nf_conn *ct; |
3c158f7f | 784 | struct nf_conn_help *help; |
9fb9cbb1 | 785 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 786 | struct nf_conntrack_ecache *ecache; |
9fb9cbb1 | 787 | struct nf_conntrack_expect *exp; |
5d0aa2cc | 788 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
60b5f8f7 PNA |
789 | struct nf_conn_timeout *timeout_ext; |
790 | unsigned int *timeouts; | |
9fb9cbb1 | 791 | |
605dcad6 | 792 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 793 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
794 | return NULL; |
795 | } | |
796 | ||
99f07e91 CG |
797 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
798 | hash); | |
0a9ee813 | 799 | if (IS_ERR(ct)) |
c88130bc | 800 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 801 | |
60b5f8f7 PNA |
802 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
803 | if (timeout_ext) | |
804 | timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext); | |
805 | else | |
806 | timeouts = l4proto->get_timeouts(net); | |
807 | ||
2c8503f5 | 808 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 809 | nf_conntrack_free(ct); |
0d53778e | 810 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
811 | return NULL; |
812 | } | |
813 | ||
60b5f8f7 PNA |
814 | if (timeout_ext) |
815 | nf_ct_timeout_ext_add(ct, timeout_ext->timeout, GFP_ATOMIC); | |
816 | ||
58401572 | 817 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 818 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 819 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
820 | |
821 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
822 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
823 | ecache ? ecache->expmask : 0, | |
824 | GFP_ATOMIC); | |
58401572 | 825 | |
f8ba1aff | 826 | spin_lock_bh(&nf_conntrack_lock); |
5d0aa2cc | 827 | exp = nf_ct_find_expectation(net, zone, tuple); |
9fb9cbb1 | 828 | if (exp) { |
0d53778e | 829 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 830 | ct, exp); |
9fb9cbb1 | 831 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
832 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
833 | ct->master = exp->master; | |
ceceae1b | 834 | if (exp->helper) { |
1afc5679 PNA |
835 | help = nf_ct_helper_ext_add(ct, exp->helper, |
836 | GFP_ATOMIC); | |
ceceae1b | 837 | if (help) |
cf778b00 | 838 | rcu_assign_pointer(help->helper, exp->helper); |
ceceae1b YK |
839 | } |
840 | ||
9fb9cbb1 | 841 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 842 | ct->mark = exp->master->mark; |
7c9728c3 JM |
843 | #endif |
844 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 845 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 846 | #endif |
c88130bc | 847 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 848 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 849 | } else { |
b2a15a60 | 850 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af87 | 851 | NF_CT_STAT_INC(net, new); |
22e7410b | 852 | } |
9fb9cbb1 YK |
853 | |
854 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 855 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 856 | &net->ct.unconfirmed); |
9fb9cbb1 | 857 | |
f8ba1aff | 858 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
859 | |
860 | if (exp) { | |
861 | if (exp->expectfn) | |
c88130bc | 862 | exp->expectfn(ct, exp); |
6823645d | 863 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
864 | } |
865 | ||
c88130bc | 866 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
867 | } |
868 | ||
869 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
870 | static inline struct nf_conn * | |
b2a15a60 | 871 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 872 | struct sk_buff *skb, |
9fb9cbb1 YK |
873 | unsigned int dataoff, |
874 | u_int16_t l3num, | |
875 | u_int8_t protonum, | |
876 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 877 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 878 | int *set_reply, |
60b5f8f7 | 879 | enum ip_conntrack_info *ctinfo) |
9fb9cbb1 YK |
880 | { |
881 | struct nf_conntrack_tuple tuple; | |
882 | struct nf_conntrack_tuple_hash *h; | |
883 | struct nf_conn *ct; | |
5d0aa2cc | 884 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
99f07e91 | 885 | u32 hash; |
9fb9cbb1 | 886 | |
bbe735e4 | 887 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 888 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 889 | l4proto)) { |
0d53778e | 890 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
891 | return NULL; |
892 | } | |
893 | ||
894 | /* look for tuple match */ | |
99f07e91 CG |
895 | hash = hash_conntrack_raw(&tuple, zone); |
896 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); | |
9fb9cbb1 | 897 | if (!h) { |
b2a15a60 | 898 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 899 | skb, dataoff, hash); |
9fb9cbb1 YK |
900 | if (!h) |
901 | return NULL; | |
902 | if (IS_ERR(h)) | |
903 | return (void *)h; | |
904 | } | |
905 | ct = nf_ct_tuplehash_to_ctrack(h); | |
906 | ||
907 | /* It exists; we have (non-exclusive) reference. */ | |
908 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fb048833 | 909 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
910 | /* Please set reply bit if this packet OK */ |
911 | *set_reply = 1; | |
912 | } else { | |
913 | /* Once we've had two way comms, always ESTABLISHED. */ | |
914 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 915 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
916 | *ctinfo = IP_CT_ESTABLISHED; |
917 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
918 | pr_debug("nf_conntrack_in: related packet for %p\n", |
919 | ct); | |
9fb9cbb1 YK |
920 | *ctinfo = IP_CT_RELATED; |
921 | } else { | |
0d53778e | 922 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
923 | *ctinfo = IP_CT_NEW; |
924 | } | |
925 | *set_reply = 0; | |
926 | } | |
927 | skb->nfct = &ct->ct_general; | |
928 | skb->nfctinfo = *ctinfo; | |
929 | return ct; | |
930 | } | |
931 | ||
932 | unsigned int | |
a702a65f AD |
933 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
934 | struct sk_buff *skb) | |
9fb9cbb1 | 935 | { |
b2a15a60 | 936 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
937 | enum ip_conntrack_info ctinfo; |
938 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 939 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 940 | unsigned int *timeouts; |
9fb9cbb1 YK |
941 | unsigned int dataoff; |
942 | u_int8_t protonum; | |
943 | int set_reply = 0; | |
944 | int ret; | |
945 | ||
3db05fea | 946 | if (skb->nfct) { |
b2a15a60 PM |
947 | /* Previously seen (loopback or untracked)? Ignore. */ |
948 | tmpl = (struct nf_conn *)skb->nfct; | |
949 | if (!nf_ct_is_template(tmpl)) { | |
950 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
951 | return NF_ACCEPT; | |
952 | } | |
953 | skb->nfct = NULL; | |
9fb9cbb1 YK |
954 | } |
955 | ||
923f4902 | 956 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 957 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 958 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
959 | &dataoff, &protonum); |
960 | if (ret <= 0) { | |
25985edc | 961 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
962 | NF_CT_STAT_INC_ATOMIC(net, error); |
963 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
964 | ret = -ret; |
965 | goto out; | |
9fb9cbb1 YK |
966 | } |
967 | ||
76108cea | 968 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
969 | |
970 | /* It may be an special packet, error, unclean... | |
971 | * inverse of the return code tells to the netfilter | |
972 | * core what to do with the packet. */ | |
74c51a14 | 973 | if (l4proto->error != NULL) { |
8fea97ec PM |
974 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
975 | pf, hooknum); | |
74c51a14 | 976 | if (ret <= 0) { |
0d55af87 AD |
977 | NF_CT_STAT_INC_ATOMIC(net, error); |
978 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
979 | ret = -ret; |
980 | goto out; | |
74c51a14 | 981 | } |
88ed01d1 PNA |
982 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
983 | if (skb->nfct) | |
984 | goto out; | |
9fb9cbb1 YK |
985 | } |
986 | ||
b2a15a60 | 987 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
60b5f8f7 | 988 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
989 | if (!ct) { |
990 | /* Not valid part of a connection */ | |
0d55af87 | 991 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
992 | ret = NF_ACCEPT; |
993 | goto out; | |
9fb9cbb1 YK |
994 | } |
995 | ||
996 | if (IS_ERR(ct)) { | |
997 | /* Too stressed to deal. */ | |
0d55af87 | 998 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
999 | ret = NF_DROP; |
1000 | goto out; | |
9fb9cbb1 YK |
1001 | } |
1002 | ||
3db05fea | 1003 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 1004 | |
60b5f8f7 | 1005 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1006 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1007 | |
2c8503f5 | 1008 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1009 | if (ret <= 0) { |
9fb9cbb1 YK |
1010 | /* Invalid: inverse of the return code tells |
1011 | * the netfilter core what to do */ | |
0d53778e | 1012 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
1013 | nf_conntrack_put(skb->nfct); |
1014 | skb->nfct = NULL; | |
0d55af87 | 1015 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1016 | if (ret == -NF_DROP) |
1017 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
1018 | ret = -ret; |
1019 | goto out; | |
9fb9cbb1 YK |
1020 | } |
1021 | ||
1022 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1023 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1024 | out: |
c3174286 PNA |
1025 | if (tmpl) { |
1026 | /* Special case: we have to repeat this hook, assign the | |
1027 | * template again to this packet. We assume that this packet | |
1028 | * has no conntrack assigned. This is used by nf_ct_tcp. */ | |
1029 | if (ret == NF_REPEAT) | |
1030 | skb->nfct = (struct nf_conntrack *)tmpl; | |
1031 | else | |
1032 | nf_ct_put(tmpl); | |
1033 | } | |
9fb9cbb1 YK |
1034 | |
1035 | return ret; | |
1036 | } | |
13b18339 | 1037 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1038 | |
5f2b4c90 JE |
1039 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1040 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1041 | { |
5f2b4c90 | 1042 | bool ret; |
923f4902 PM |
1043 | |
1044 | rcu_read_lock(); | |
1045 | ret = nf_ct_invert_tuple(inverse, orig, | |
1046 | __nf_ct_l3proto_find(orig->src.l3num), | |
1047 | __nf_ct_l4proto_find(orig->src.l3num, | |
1048 | orig->dst.protonum)); | |
1049 | rcu_read_unlock(); | |
1050 | return ret; | |
9fb9cbb1 | 1051 | } |
13b18339 | 1052 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1053 | |
5b1158e9 JK |
1054 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1055 | implicitly racy: see __nf_conntrack_confirm */ | |
1056 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1057 | const struct nf_conntrack_tuple *newreply) | |
1058 | { | |
1059 | struct nf_conn_help *help = nfct_help(ct); | |
1060 | ||
5b1158e9 JK |
1061 | /* Should be unconfirmed, so not in hash table yet */ |
1062 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1063 | ||
0d53778e | 1064 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1065 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1066 | |
1067 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1068 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1069 | return; |
ceceae1b | 1070 | |
c52fbb41 | 1071 | rcu_read_lock(); |
b2a15a60 | 1072 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1073 | rcu_read_unlock(); |
5b1158e9 | 1074 | } |
13b18339 | 1075 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1076 | |
9fb9cbb1 YK |
1077 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1078 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1079 | enum ip_conntrack_info ctinfo, | |
1080 | const struct sk_buff *skb, | |
1081 | unsigned long extra_jiffies, | |
1082 | int do_acct) | |
1083 | { | |
9fb9cbb1 YK |
1084 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
1085 | NF_CT_ASSERT(skb); | |
1086 | ||
997ae831 | 1087 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1088 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1089 | goto acct; | |
997ae831 | 1090 | |
9fb9cbb1 YK |
1091 | /* If not in hash table, timer will not be active yet */ |
1092 | if (!nf_ct_is_confirmed(ct)) { | |
1093 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 1094 | } else { |
be00c8e4 MJ |
1095 | unsigned long newtime = jiffies + extra_jiffies; |
1096 | ||
1097 | /* Only update the timeout if the new timeout is at least | |
1098 | HZ jiffies from the old timeout. Need del_timer for race | |
1099 | avoidance (may already be dying). */ | |
65cb9fda PM |
1100 | if (newtime - ct->timeout.expires >= HZ) |
1101 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
1102 | } |
1103 | ||
47d95045 | 1104 | acct: |
9fb9cbb1 | 1105 | if (do_acct) { |
58401572 | 1106 | struct nf_conn_counter *acct; |
3ffd5eeb | 1107 | |
58401572 KPO |
1108 | acct = nf_conn_acct_find(ct); |
1109 | if (acct) { | |
b3e0bfa7 ED |
1110 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1111 | atomic64_add(skb->len, &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1112 | } |
9fb9cbb1 | 1113 | } |
9fb9cbb1 | 1114 | } |
13b18339 | 1115 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1116 | |
4c889498 DM |
1117 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
1118 | enum ip_conntrack_info ctinfo, | |
1119 | const struct sk_buff *skb, | |
1120 | int do_acct) | |
51091764 | 1121 | { |
718d4ad9 | 1122 | if (do_acct) { |
58401572 KPO |
1123 | struct nf_conn_counter *acct; |
1124 | ||
58401572 KPO |
1125 | acct = nf_conn_acct_find(ct); |
1126 | if (acct) { | |
b3e0bfa7 ED |
1127 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1128 | atomic64_add(skb->len - skb_network_offset(skb), | |
1129 | &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1130 | } |
718d4ad9 | 1131 | } |
58401572 | 1132 | |
4c889498 | 1133 | if (del_timer(&ct->timeout)) { |
51091764 | 1134 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
1135 | return true; |
1136 | } | |
1137 | return false; | |
51091764 | 1138 | } |
718d4ad9 | 1139 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 1140 | |
5d0aa2cc PM |
1141 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1142 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { | |
1143 | .len = sizeof(struct nf_conntrack_zone), | |
1144 | .align = __alignof__(struct nf_conntrack_zone), | |
1145 | .id = NF_CT_EXT_ZONE, | |
1146 | }; | |
1147 | #endif | |
1148 | ||
c0cd1156 | 1149 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1150 | |
1151 | #include <linux/netfilter/nfnetlink.h> | |
1152 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1153 | #include <linux/mutex.h> |
1154 | ||
c1d10adb PNA |
1155 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1156 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1157 | * or depend on ctnetlink */ | |
fdf70832 | 1158 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1159 | const struct nf_conntrack_tuple *tuple) |
1160 | { | |
bae65be8 DM |
1161 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1162 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1163 | goto nla_put_failure; | |
c1d10adb PNA |
1164 | return 0; |
1165 | ||
df6fb868 | 1166 | nla_put_failure: |
c1d10adb PNA |
1167 | return -1; |
1168 | } | |
fdf70832 | 1169 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1170 | |
f73e924c PM |
1171 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1172 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1173 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1174 | }; |
f73e924c | 1175 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1176 | |
fdf70832 | 1177 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1178 | struct nf_conntrack_tuple *t) |
1179 | { | |
df6fb868 | 1180 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1181 | return -EINVAL; |
1182 | ||
77236b6e PM |
1183 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1184 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1185 | |
1186 | return 0; | |
1187 | } | |
fdf70832 | 1188 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1189 | |
1190 | int nf_ct_port_nlattr_tuple_size(void) | |
1191 | { | |
1192 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1193 | } | |
1194 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1195 | #endif |
1196 | ||
9fb9cbb1 | 1197 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1198 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1199 | { |
1200 | struct nf_conn *ct; | |
1201 | enum ip_conntrack_info ctinfo; | |
1202 | ||
1203 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1204 | ct = nf_ct_get(skb, &ctinfo); | |
1205 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1206 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1207 | else |
1208 | ctinfo = IP_CT_RELATED; | |
1209 | ||
1210 | /* Attach to new skbuff, and increment count */ | |
1211 | nskb->nfct = &ct->ct_general; | |
1212 | nskb->nfctinfo = ctinfo; | |
1213 | nf_conntrack_get(nskb->nfct); | |
1214 | } | |
1215 | ||
9fb9cbb1 | 1216 | /* Bring out ya dead! */ |
df0933dc | 1217 | static struct nf_conn * |
400dad39 | 1218 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1219 | void *data, unsigned int *bucket) |
1220 | { | |
df0933dc PM |
1221 | struct nf_conntrack_tuple_hash *h; |
1222 | struct nf_conn *ct; | |
ea781f19 | 1223 | struct hlist_nulls_node *n; |
9fb9cbb1 | 1224 | |
f8ba1aff | 1225 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1226 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
ea781f19 | 1227 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
b0cdb1d9 PM |
1228 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1229 | continue; | |
df0933dc PM |
1230 | ct = nf_ct_tuplehash_to_ctrack(h); |
1231 | if (iter(ct, data)) | |
1232 | goto found; | |
1233 | } | |
601e68e1 | 1234 | } |
ea781f19 | 1235 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
1236 | ct = nf_ct_tuplehash_to_ctrack(h); |
1237 | if (iter(ct, data)) | |
ec68e97d | 1238 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 1239 | } |
f8ba1aff | 1240 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
1241 | return NULL; |
1242 | found: | |
c073e3fa | 1243 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1244 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1245 | return ct; |
9fb9cbb1 YK |
1246 | } |
1247 | ||
400dad39 AD |
1248 | void nf_ct_iterate_cleanup(struct net *net, |
1249 | int (*iter)(struct nf_conn *i, void *data), | |
c655bc68 | 1250 | void *data, u32 portid, int report) |
9fb9cbb1 | 1251 | { |
df0933dc | 1252 | struct nf_conn *ct; |
9fb9cbb1 YK |
1253 | unsigned int bucket = 0; |
1254 | ||
400dad39 | 1255 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1256 | /* Time to push up daises... */ |
1257 | if (del_timer(&ct->timeout)) | |
c655bc68 | 1258 | nf_ct_delete(ct, portid, report); |
02982c27 | 1259 | |
9fb9cbb1 YK |
1260 | /* ... else the timer will get him soon. */ |
1261 | ||
1262 | nf_ct_put(ct); | |
1263 | } | |
1264 | } | |
13b18339 | 1265 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1266 | |
274d383b PNA |
1267 | static int kill_all(struct nf_conn *i, void *data) |
1268 | { | |
1269 | return 1; | |
1270 | } | |
1271 | ||
d862a662 | 1272 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1273 | { |
d862a662 | 1274 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1275 | vfree(hash); |
1276 | else | |
601e68e1 | 1277 | free_pages((unsigned long)hash, |
f205c5e0 | 1278 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1279 | } |
ac565e5f | 1280 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1281 | |
ec464e5d | 1282 | void nf_conntrack_flush_report(struct net *net, u32 portid, int report) |
c1d10adb | 1283 | { |
c655bc68 | 1284 | nf_ct_iterate_cleanup(net, kill_all, NULL, portid, report); |
c1d10adb | 1285 | } |
274d383b | 1286 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1287 | |
ee254fa4 | 1288 | static void nf_ct_release_dying_list(struct net *net) |
dd7669a9 PNA |
1289 | { |
1290 | struct nf_conntrack_tuple_hash *h; | |
1291 | struct nf_conn *ct; | |
1292 | struct hlist_nulls_node *n; | |
1293 | ||
1294 | spin_lock_bh(&nf_conntrack_lock); | |
ee254fa4 | 1295 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a9 PNA |
1296 | ct = nf_ct_tuplehash_to_ctrack(h); |
1297 | /* never fails to remove them, no listeners at this point */ | |
1298 | nf_ct_kill(ct); | |
1299 | } | |
1300 | spin_unlock_bh(&nf_conntrack_lock); | |
1301 | } | |
1302 | ||
b3c5163f ED |
1303 | static int untrack_refs(void) |
1304 | { | |
1305 | int cnt = 0, cpu; | |
1306 | ||
1307 | for_each_possible_cpu(cpu) { | |
1308 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1309 | ||
1310 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1311 | } | |
1312 | return cnt; | |
1313 | } | |
1314 | ||
f94161c1 | 1315 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1316 | { |
f94161c1 G |
1317 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1318 | } | |
1319 | ||
1320 | void nf_conntrack_cleanup_end(void) | |
1321 | { | |
1322 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1323 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1324 | schedule(); |
1325 | ||
5d0aa2cc PM |
1326 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1327 | nf_ct_extend_unregister(&nf_ct_zone_extend); | |
1328 | #endif | |
04d87001 | 1329 | nf_conntrack_proto_fini(); |
41d73ec0 | 1330 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 1331 | nf_conntrack_labels_fini(); |
5e615b22 | 1332 | nf_conntrack_helper_fini(); |
8684094c | 1333 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1334 | nf_conntrack_ecache_fini(); |
73f4001a | 1335 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1336 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1337 | nf_conntrack_expect_fini(); |
08f6547d | 1338 | } |
9fb9cbb1 | 1339 | |
f94161c1 G |
1340 | /* |
1341 | * Mishearing the voices in his head, our hero wonders how he's | |
1342 | * supposed to kill the mall. | |
1343 | */ | |
1344 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1345 | { |
dece40e8 VD |
1346 | LIST_HEAD(single); |
1347 | ||
1348 | list_add(&net->exit_list, &single); | |
1349 | nf_conntrack_cleanup_net_list(&single); | |
1350 | } | |
1351 | ||
1352 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1353 | { | |
1354 | int busy; | |
1355 | struct net *net; | |
1356 | ||
f94161c1 G |
1357 | /* |
1358 | * This makes sure all current packets have passed through | |
1359 | * netfilter framework. Roll on, two-stage module | |
1360 | * delete... | |
1361 | */ | |
1362 | synchronize_net(); | |
dece40e8 VD |
1363 | i_see_dead_people: |
1364 | busy = 0; | |
1365 | list_for_each_entry(net, net_exit_list, exit_list) { | |
c655bc68 | 1366 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
dece40e8 VD |
1367 | nf_ct_release_dying_list(net); |
1368 | if (atomic_read(&net->ct.count) != 0) | |
1369 | busy = 1; | |
1370 | } | |
1371 | if (busy) { | |
9fb9cbb1 YK |
1372 | schedule(); |
1373 | goto i_see_dead_people; | |
1374 | } | |
1375 | ||
dece40e8 VD |
1376 | list_for_each_entry(net, net_exit_list, exit_list) { |
1377 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); | |
1378 | nf_conntrack_proto_pernet_fini(net); | |
1379 | nf_conntrack_helper_pernet_fini(net); | |
1380 | nf_conntrack_ecache_pernet_fini(net); | |
1381 | nf_conntrack_tstamp_pernet_fini(net); | |
1382 | nf_conntrack_acct_pernet_fini(net); | |
1383 | nf_conntrack_expect_pernet_fini(net); | |
1384 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); | |
1385 | kfree(net->ct.slabname); | |
1386 | free_percpu(net->ct.stat); | |
1387 | } | |
08f6547d AD |
1388 | } |
1389 | ||
d862a662 | 1390 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1391 | { |
ea781f19 ED |
1392 | struct hlist_nulls_head *hash; |
1393 | unsigned int nr_slots, i; | |
1394 | size_t sz; | |
9fb9cbb1 | 1395 | |
ea781f19 ED |
1396 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1397 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1398 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1399 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1400 | get_order(sz)); | |
601e68e1 | 1401 | if (!hash) { |
9fb9cbb1 | 1402 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
966567b7 | 1403 | hash = vzalloc(sz); |
9fb9cbb1 YK |
1404 | } |
1405 | ||
ea781f19 ED |
1406 | if (hash && nulls) |
1407 | for (i = 0; i < nr_slots; i++) | |
1408 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1409 | |
1410 | return hash; | |
1411 | } | |
ac565e5f | 1412 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1413 | |
fae718dd | 1414 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1415 | { |
4b5511eb | 1416 | int i, bucket, rc; |
96eb24d7 | 1417 | unsigned int hashsize, old_size; |
ea781f19 | 1418 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1419 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1420 | struct nf_conn *ct; |
9fb9cbb1 | 1421 | |
d696c7bd PM |
1422 | if (current->nsproxy->net_ns != &init_net) |
1423 | return -EOPNOTSUPP; | |
1424 | ||
9fb9cbb1 YK |
1425 | /* On boot, we can set this without any fancy locking. */ |
1426 | if (!nf_conntrack_htable_size) | |
1427 | return param_set_uint(val, kp); | |
1428 | ||
4b5511eb AP |
1429 | rc = kstrtouint(val, 0, &hashsize); |
1430 | if (rc) | |
1431 | return rc; | |
9fb9cbb1 YK |
1432 | if (!hashsize) |
1433 | return -EINVAL; | |
1434 | ||
d862a662 | 1435 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1436 | if (!hash) |
1437 | return -ENOMEM; | |
1438 | ||
76507f69 PM |
1439 | /* Lookups in the old hash might happen in parallel, which means we |
1440 | * might get false negatives during connection lookup. New connections | |
1441 | * created because of a false negative won't make it into the hash | |
1442 | * though since that required taking the lock. | |
1443 | */ | |
f8ba1aff | 1444 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1445 | for (i = 0; i < init_net.ct.htable_size; i++) { |
ea781f19 ED |
1446 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1447 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1448 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1449 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1450 | hlist_nulls_del_rcu(&h->hnnode); |
5d0aa2cc | 1451 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
99f07e91 | 1452 | hashsize); |
ea781f19 | 1453 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1454 | } |
1455 | } | |
d696c7bd | 1456 | old_size = init_net.ct.htable_size; |
400dad39 | 1457 | old_hash = init_net.ct.hash; |
9fb9cbb1 | 1458 | |
d696c7bd | 1459 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
400dad39 | 1460 | init_net.ct.hash = hash; |
f8ba1aff | 1461 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1462 | |
d862a662 | 1463 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1464 | return 0; |
1465 | } | |
fae718dd | 1466 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1467 | |
fae718dd | 1468 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1469 | &nf_conntrack_htable_size, 0600); |
1470 | ||
5bfddbd4 ED |
1471 | void nf_ct_untracked_status_or(unsigned long bits) |
1472 | { | |
b3c5163f ED |
1473 | int cpu; |
1474 | ||
1475 | for_each_possible_cpu(cpu) | |
1476 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1477 | } |
1478 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1479 | ||
f94161c1 | 1480 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1481 | { |
f205c5e0 | 1482 | int max_factor = 8; |
b3c5163f | 1483 | int ret, cpu; |
9fb9cbb1 YK |
1484 | |
1485 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1486 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1487 | if (!nf_conntrack_htable_size) { |
1488 | nf_conntrack_htable_size | |
4481374c | 1489 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1490 | / sizeof(struct hlist_head)); |
4481374c | 1491 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1492 | nf_conntrack_htable_size = 16384; |
1493 | if (nf_conntrack_htable_size < 32) | |
1494 | nf_conntrack_htable_size = 32; | |
1495 | ||
1496 | /* Use a max. factor of four by default to get the same max as | |
1497 | * with the old struct list_heads. When a table size is given | |
1498 | * we use the old value of 8 to avoid reducing the max. | |
1499 | * entries. */ | |
1500 | max_factor = 4; | |
9fb9cbb1 | 1501 | } |
f205c5e0 | 1502 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1503 | |
654d0fbd | 1504 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1505 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1506 | nf_conntrack_max); | |
83b4dbe1 G |
1507 | |
1508 | ret = nf_conntrack_expect_init(); | |
1509 | if (ret < 0) | |
1510 | goto err_expect; | |
1511 | ||
b7ff3a1f G |
1512 | ret = nf_conntrack_acct_init(); |
1513 | if (ret < 0) | |
1514 | goto err_acct; | |
1515 | ||
73f4001a G |
1516 | ret = nf_conntrack_tstamp_init(); |
1517 | if (ret < 0) | |
1518 | goto err_tstamp; | |
1519 | ||
3fe0f943 G |
1520 | ret = nf_conntrack_ecache_init(); |
1521 | if (ret < 0) | |
1522 | goto err_ecache; | |
1523 | ||
8684094c G |
1524 | ret = nf_conntrack_timeout_init(); |
1525 | if (ret < 0) | |
1526 | goto err_timeout; | |
1527 | ||
5e615b22 G |
1528 | ret = nf_conntrack_helper_init(); |
1529 | if (ret < 0) | |
1530 | goto err_helper; | |
1531 | ||
5f69b8f5 G |
1532 | ret = nf_conntrack_labels_init(); |
1533 | if (ret < 0) | |
1534 | goto err_labels; | |
1535 | ||
41d73ec0 PM |
1536 | ret = nf_conntrack_seqadj_init(); |
1537 | if (ret < 0) | |
1538 | goto err_seqadj; | |
1539 | ||
5d0aa2cc PM |
1540 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1541 | ret = nf_ct_extend_register(&nf_ct_zone_extend); | |
1542 | if (ret < 0) | |
1543 | goto err_extend; | |
1544 | #endif | |
04d87001 G |
1545 | ret = nf_conntrack_proto_init(); |
1546 | if (ret < 0) | |
1547 | goto err_proto; | |
1548 | ||
9edd7ca0 | 1549 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1550 | for_each_possible_cpu(cpu) { |
1551 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1552 | write_pnet(&ct->ct_net, &init_net); |
1553 | atomic_set(&ct->ct_general.use, 1); | |
1554 | } | |
9edd7ca0 | 1555 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1556 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d AD |
1557 | return 0; |
1558 | ||
04d87001 | 1559 | err_proto: |
5d0aa2cc | 1560 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
04d87001 | 1561 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
5d0aa2cc | 1562 | err_extend: |
a9006892 | 1563 | #endif |
41d73ec0 PM |
1564 | nf_conntrack_seqadj_fini(); |
1565 | err_seqadj: | |
04d87001 | 1566 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1567 | err_labels: |
1568 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1569 | err_helper: |
1570 | nf_conntrack_timeout_fini(); | |
8684094c G |
1571 | err_timeout: |
1572 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1573 | err_ecache: |
1574 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1575 | err_tstamp: |
1576 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1577 | err_acct: |
1578 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1579 | err_expect: |
08f6547d AD |
1580 | return ret; |
1581 | } | |
1582 | ||
f94161c1 G |
1583 | void nf_conntrack_init_end(void) |
1584 | { | |
1585 | /* For use by REJECT target */ | |
1586 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1587 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
f94161c1 G |
1588 | } |
1589 | ||
8cc20198 ED |
1590 | /* |
1591 | * We need to use special "null" values, not used in hash table | |
1592 | */ | |
1593 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1594 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1595 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1596 | |
f94161c1 | 1597 | int nf_conntrack_init_net(struct net *net) |
08f6547d AD |
1598 | { |
1599 | int ret; | |
ceceae1b | 1600 | |
08f6547d | 1601 | atomic_set(&net->ct.count, 0); |
8cc20198 ED |
1602 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
1603 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); | |
252b3e8c | 1604 | INIT_HLIST_NULLS_HEAD(&net->ct.tmpl, TEMPLATE_NULLS_VAL); |
08f6547d AD |
1605 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1606 | if (!net->ct.stat) { | |
1607 | ret = -ENOMEM; | |
1608 | goto err_stat; | |
1609 | } | |
5b3501fa ED |
1610 | |
1611 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); | |
1612 | if (!net->ct.slabname) { | |
1613 | ret = -ENOMEM; | |
1614 | goto err_slabname; | |
1615 | } | |
1616 | ||
1617 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, | |
1618 | sizeof(struct nf_conn), 0, | |
1619 | SLAB_DESTROY_BY_RCU, NULL); | |
1620 | if (!net->ct.nf_conntrack_cachep) { | |
1621 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); | |
1622 | ret = -ENOMEM; | |
1623 | goto err_cache; | |
1624 | } | |
d696c7bd PM |
1625 | |
1626 | net->ct.htable_size = nf_conntrack_htable_size; | |
d862a662 | 1627 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
08f6547d AD |
1628 | if (!net->ct.hash) { |
1629 | ret = -ENOMEM; | |
1630 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1631 | goto err_hash; | |
1632 | } | |
83b4dbe1 | 1633 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1634 | if (ret < 0) |
1635 | goto err_expect; | |
b7ff3a1f | 1636 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 1637 | if (ret < 0) |
08f6547d | 1638 | goto err_acct; |
73f4001a | 1639 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
1640 | if (ret < 0) |
1641 | goto err_tstamp; | |
3fe0f943 | 1642 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
1643 | if (ret < 0) |
1644 | goto err_ecache; | |
5e615b22 | 1645 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
1646 | if (ret < 0) |
1647 | goto err_helper; | |
04d87001 | 1648 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
1649 | if (ret < 0) |
1650 | goto err_proto; | |
08f6547d | 1651 | return 0; |
c539f017 | 1652 | |
f94161c1 | 1653 | err_proto: |
5e615b22 | 1654 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 1655 | err_helper: |
3fe0f943 | 1656 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 1657 | err_ecache: |
73f4001a | 1658 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 1659 | err_tstamp: |
b7ff3a1f | 1660 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 1661 | err_acct: |
83b4dbe1 | 1662 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 1663 | err_expect: |
d862a662 | 1664 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
6058fa6b | 1665 | err_hash: |
5b3501fa ED |
1666 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
1667 | err_cache: | |
1668 | kfree(net->ct.slabname); | |
1669 | err_slabname: | |
0d55af87 AD |
1670 | free_percpu(net->ct.stat); |
1671 | err_stat: | |
08f6547d AD |
1672 | return ret; |
1673 | } |