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 YK |
41 | #include <net/netfilter/nf_conntrack_helper.h> |
42 | #include <net/netfilter/nf_conntrack_core.h> | |
ecfab2c9 | 43 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 44 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 45 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 46 | #include <net/netfilter/nf_conntrack_zones.h> |
a992ca2a | 47 | #include <net/netfilter/nf_conntrack_timestamp.h> |
dd705072 | 48 | #include <net/netfilter/nf_conntrack_timeout.h> |
c539f017 | 49 | #include <net/netfilter/nf_conntrack_labels.h> |
e6a7d3c0 | 50 | #include <net/netfilter/nf_nat.h> |
e17b666a | 51 | #include <net/netfilter/nf_nat_core.h> |
49376368 | 52 | #include <net/netfilter/nf_nat_helper.h> |
9fb9cbb1 | 53 | |
dc808fe2 | 54 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 55 | |
e17b666a PM |
56 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
57 | enum nf_nat_manip_type manip, | |
39938324 | 58 | const struct nlattr *attr) __read_mostly; |
e6a7d3c0 PNA |
59 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
60 | ||
c7232c99 PM |
61 | int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, |
62 | struct nf_conn *ct, | |
63 | enum ip_conntrack_info ctinfo, | |
64 | unsigned int protoff); | |
65 | EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); | |
66 | ||
f8ba1aff | 67 | DEFINE_SPINLOCK(nf_conntrack_lock); |
13b18339 | 68 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
9fb9cbb1 | 69 | |
e2b7606c | 70 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
71 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
72 | ||
e478075c | 73 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 74 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 75 | |
b3c5163f ED |
76 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
77 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 78 | |
f682cefa | 79 | unsigned int nf_conntrack_hash_rnd __read_mostly; |
4d4e61c6 | 80 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
9fb9cbb1 | 81 | |
99f07e91 | 82 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, u16 zone) |
9fb9cbb1 | 83 | { |
0794935e | 84 | unsigned int n; |
0794935e PM |
85 | |
86 | /* The direction must be ignored, so we hash everything up to the | |
87 | * destination ports (which is a multiple of 4) and treat the last | |
88 | * three bytes manually. | |
89 | */ | |
90 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); | |
99f07e91 CG |
91 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
92 | (((__force __u16)tuple->dst.u.all << 16) | | |
93 | tuple->dst.protonum)); | |
94 | } | |
95 | ||
96 | static u32 __hash_bucket(u32 hash, unsigned int size) | |
97 | { | |
98 | return ((u64)hash * size) >> 32; | |
99 | } | |
100 | ||
101 | static u32 hash_bucket(u32 hash, const struct net *net) | |
102 | { | |
103 | return __hash_bucket(hash, net->ct.htable_size); | |
104 | } | |
0794935e | 105 | |
99f07e91 CG |
106 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
107 | u16 zone, unsigned int size) | |
108 | { | |
109 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); | |
9fb9cbb1 YK |
110 | } |
111 | ||
5d0aa2cc | 112 | static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
d696c7bd | 113 | const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 114 | { |
99f07e91 | 115 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
9fb9cbb1 YK |
116 | } |
117 | ||
5f2b4c90 | 118 | bool |
9fb9cbb1 YK |
119 | nf_ct_get_tuple(const struct sk_buff *skb, |
120 | unsigned int nhoff, | |
121 | unsigned int dataoff, | |
122 | u_int16_t l3num, | |
123 | u_int8_t protonum, | |
124 | struct nf_conntrack_tuple *tuple, | |
125 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 126 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 127 | { |
443a70d5 | 128 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
129 | |
130 | tuple->src.l3num = l3num; | |
131 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 132 | return false; |
9fb9cbb1 YK |
133 | |
134 | tuple->dst.protonum = protonum; | |
135 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
136 | ||
605dcad6 | 137 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
9fb9cbb1 | 138 | } |
13b18339 | 139 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 140 | |
5f2b4c90 JE |
141 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
142 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
143 | { |
144 | struct nf_conntrack_l3proto *l3proto; | |
145 | struct nf_conntrack_l4proto *l4proto; | |
146 | unsigned int protoff; | |
147 | u_int8_t protonum; | |
148 | int ret; | |
149 | ||
150 | rcu_read_lock(); | |
151 | ||
152 | l3proto = __nf_ct_l3proto_find(l3num); | |
153 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
154 | if (ret != NF_ACCEPT) { | |
155 | rcu_read_unlock(); | |
5f2b4c90 | 156 | return false; |
e2a3123f YK |
157 | } |
158 | ||
159 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
160 | ||
161 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, | |
162 | l3proto, l4proto); | |
163 | ||
164 | rcu_read_unlock(); | |
165 | return ret; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
168 | ||
5f2b4c90 | 169 | bool |
9fb9cbb1 YK |
170 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
171 | const struct nf_conntrack_tuple *orig, | |
172 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 173 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 174 | { |
443a70d5 | 175 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
176 | |
177 | inverse->src.l3num = orig->src.l3num; | |
178 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 179 | return false; |
9fb9cbb1 YK |
180 | |
181 | inverse->dst.dir = !orig->dst.dir; | |
182 | ||
183 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 184 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 185 | } |
13b18339 | 186 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 187 | |
9fb9cbb1 YK |
188 | static void |
189 | clean_from_lists(struct nf_conn *ct) | |
190 | { | |
4b9e9796 | 191 | pr_debug("clean_from_lists(%pK)\n", ct); |
ea781f19 ED |
192 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
193 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
194 | |
195 | /* Destroy all pending expectations */ | |
c1d10adb | 196 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
197 | } |
198 | ||
199 | static void | |
200 | destroy_conntrack(struct nf_conntrack *nfct) | |
201 | { | |
202 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 203 | struct net *net = nf_ct_net(ct); |
605dcad6 | 204 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 205 | |
4b9e9796 | 206 | pr_debug("destroy_conntrack(%pK)\n", ct); |
9fb9cbb1 YK |
207 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
208 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
209 | ||
9fb9cbb1 YK |
210 | /* To make sure we don't get any weird locking issues here: |
211 | * destroy_conntrack() MUST NOT be called with a write lock | |
212 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 213 | rcu_read_lock(); |
5e8fbe2a | 214 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
215 | if (l4proto && l4proto->destroy) |
216 | l4proto->destroy(ct); | |
9fb9cbb1 | 217 | |
982d9a9c | 218 | rcu_read_unlock(); |
9fb9cbb1 | 219 | |
f8ba1aff | 220 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
221 | /* Expectations will have been removed in clean_from_lists, |
222 | * except TFTP can create an expectation on the first packet, | |
223 | * before connection is in the list, so we need to clean here, | |
224 | * too. */ | |
c1d10adb | 225 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 226 | |
04dac011 PNA |
227 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
228 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
229 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 | 230 | |
0d55af87 | 231 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 232 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
233 | |
234 | if (ct->master) | |
235 | nf_ct_put(ct->master); | |
236 | ||
4b9e9796 | 237 | pr_debug("destroy_conntrack: returning ct=%pK to slab\n", ct); |
9fb9cbb1 YK |
238 | nf_conntrack_free(ct); |
239 | } | |
240 | ||
dd7669a9 | 241 | void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 242 | { |
0d55af87 | 243 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 | 244 | |
9858a3ae | 245 | nf_ct_helper_destroy(ct); |
f8ba1aff | 246 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
247 | /* Inside lock so preempt is disabled on module removal path. |
248 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 249 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 250 | clean_from_lists(ct); |
04dac011 PNA |
251 | /* add this conntrack to the dying list */ |
252 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
253 | &net->ct.dying); | |
f8ba1aff | 254 | spin_unlock_bh(&nf_conntrack_lock); |
dd7669a9 PNA |
255 | } |
256 | EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); | |
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 | ||
04dac011 | 278 | 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 | } |
04dac011 | 291 | EXPORT_SYMBOL_GPL(nf_ct_dying_timeout); |
dd7669a9 PNA |
292 | |
293 | static void death_by_timeout(unsigned long ul_conntrack) | |
294 | { | |
295 | struct nf_conn *ct = (void *)ul_conntrack; | |
a992ca2a PNA |
296 | struct nf_conn_tstamp *tstamp; |
297 | ||
298 | tstamp = nf_conn_tstamp_find(ct); | |
299 | if (tstamp && tstamp->stop == 0) | |
300 | tstamp->stop = ktime_to_ns(ktime_get_real()); | |
dd7669a9 PNA |
301 | |
302 | if (!test_bit(IPS_DYING_BIT, &ct->status) && | |
303 | unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { | |
304 | /* destroy event was not delivered */ | |
305 | nf_ct_delete_from_lists(ct); | |
04dac011 | 306 | nf_ct_dying_timeout(ct); |
dd7669a9 PNA |
307 | return; |
308 | } | |
309 | set_bit(IPS_DYING_BIT, &ct->status); | |
310 | nf_ct_delete_from_lists(ct); | |
9fb9cbb1 YK |
311 | nf_ct_put(ct); |
312 | } | |
313 | ||
ea781f19 ED |
314 | /* |
315 | * Warning : | |
316 | * - Caller must take a reference on returned object | |
317 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
318 | * OR | |
319 | * - Caller must lock nf_conntrack_lock before calling this function | |
320 | */ | |
99f07e91 CG |
321 | static struct nf_conntrack_tuple_hash * |
322 | ____nf_conntrack_find(struct net *net, u16 zone, | |
323 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
324 | { |
325 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 326 | struct hlist_nulls_node *n; |
99f07e91 | 327 | unsigned int bucket = hash_bucket(hash, net); |
9fb9cbb1 | 328 | |
4e29e9ec PM |
329 | /* Disable BHs the entire time since we normally need to disable them |
330 | * at least once for the stats anyway. | |
331 | */ | |
332 | local_bh_disable(); | |
ea781f19 | 333 | begin: |
99f07e91 | 334 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
5d0aa2cc PM |
335 | if (nf_ct_tuple_equal(tuple, &h->tuple) && |
336 | nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { | |
0d55af87 | 337 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 338 | local_bh_enable(); |
9fb9cbb1 YK |
339 | return h; |
340 | } | |
0d55af87 | 341 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 342 | } |
ea781f19 ED |
343 | /* |
344 | * if the nulls value we got at the end of this lookup is | |
345 | * not the expected one, we must restart lookup. | |
346 | * We probably met an item that was moved to another chain. | |
347 | */ | |
99f07e91 | 348 | if (get_nulls_value(n) != bucket) { |
af740b2c | 349 | NF_CT_STAT_INC(net, search_restart); |
ea781f19 | 350 | goto begin; |
af740b2c | 351 | } |
4e29e9ec | 352 | local_bh_enable(); |
9fb9cbb1 YK |
353 | |
354 | return NULL; | |
355 | } | |
99f07e91 CG |
356 | |
357 | struct nf_conntrack_tuple_hash * | |
358 | __nf_conntrack_find(struct net *net, u16 zone, | |
359 | const struct nf_conntrack_tuple *tuple) | |
360 | { | |
361 | return ____nf_conntrack_find(net, zone, tuple, | |
362 | hash_conntrack_raw(tuple, zone)); | |
363 | } | |
13b18339 | 364 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
365 | |
366 | /* Find a connection corresponding to a tuple. */ | |
99f07e91 CG |
367 | static struct nf_conntrack_tuple_hash * |
368 | __nf_conntrack_find_get(struct net *net, u16 zone, | |
369 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
370 | { |
371 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 372 | struct nf_conn *ct; |
9fb9cbb1 | 373 | |
76507f69 | 374 | rcu_read_lock(); |
ea781f19 | 375 | begin: |
99f07e91 | 376 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
377 | if (h) { |
378 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
379 | if (unlikely(nf_ct_is_dying(ct) || |
380 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 381 | h = NULL; |
ea781f19 | 382 | else { |
5d0aa2cc PM |
383 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || |
384 | nf_ct_zone(ct) != zone)) { | |
ea781f19 ED |
385 | nf_ct_put(ct); |
386 | goto begin; | |
387 | } | |
388 | } | |
76507f69 PM |
389 | } |
390 | rcu_read_unlock(); | |
9fb9cbb1 YK |
391 | |
392 | return h; | |
393 | } | |
99f07e91 CG |
394 | |
395 | struct nf_conntrack_tuple_hash * | |
396 | nf_conntrack_find_get(struct net *net, u16 zone, | |
397 | const struct nf_conntrack_tuple *tuple) | |
398 | { | |
399 | return __nf_conntrack_find_get(net, zone, tuple, | |
400 | hash_conntrack_raw(tuple, zone)); | |
401 | } | |
13b18339 | 402 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 403 | |
c1d10adb PNA |
404 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
405 | unsigned int hash, | |
601e68e1 | 406 | unsigned int repl_hash) |
c1d10adb | 407 | { |
400dad39 AD |
408 | struct net *net = nf_ct_net(ct); |
409 | ||
ea781f19 | 410 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 411 | &net->ct.hash[hash]); |
ea781f19 | 412 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 413 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
414 | } |
415 | ||
7d367e06 JK |
416 | int |
417 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 418 | { |
d696c7bd | 419 | struct net *net = nf_ct_net(ct); |
c1d10adb | 420 | unsigned int hash, repl_hash; |
7d367e06 JK |
421 | struct nf_conntrack_tuple_hash *h; |
422 | struct hlist_nulls_node *n; | |
5d0aa2cc | 423 | u16 zone; |
c1d10adb | 424 | |
5d0aa2cc | 425 | zone = nf_ct_zone(ct); |
7d367e06 JK |
426 | hash = hash_conntrack(net, zone, |
427 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
428 | repl_hash = hash_conntrack(net, zone, | |
429 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
430 | ||
431 | spin_lock_bh(&nf_conntrack_lock); | |
432 | ||
433 | /* See if there's one in the list already, including reverse */ | |
434 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) | |
435 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
436 | &h->tuple) && | |
437 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
438 | goto out; | |
439 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) | |
440 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, | |
441 | &h->tuple) && | |
442 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
443 | goto out; | |
c1d10adb | 444 | |
7d367e06 JK |
445 | add_timer(&ct->timeout); |
446 | nf_conntrack_get(&ct->ct_general); | |
c1d10adb | 447 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
7d367e06 JK |
448 | NF_CT_STAT_INC(net, insert); |
449 | spin_unlock_bh(&nf_conntrack_lock); | |
450 | ||
451 | return 0; | |
452 | ||
453 | out: | |
454 | NF_CT_STAT_INC(net, insert_failed); | |
455 | spin_unlock_bh(&nf_conntrack_lock); | |
456 | return -EEXIST; | |
c1d10adb | 457 | } |
7d367e06 | 458 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 459 | |
9fb9cbb1 YK |
460 | /* Confirm a connection given skb; places it in hash table */ |
461 | int | |
3db05fea | 462 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
463 | { |
464 | unsigned int hash, repl_hash; | |
df0933dc | 465 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 466 | struct nf_conn *ct; |
df0933dc | 467 | struct nf_conn_help *help; |
a992ca2a | 468 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 469 | struct hlist_nulls_node *n; |
9fb9cbb1 | 470 | enum ip_conntrack_info ctinfo; |
400dad39 | 471 | struct net *net; |
5d0aa2cc | 472 | u16 zone; |
9fb9cbb1 | 473 | |
3db05fea | 474 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 475 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
476 | |
477 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
478 | ICMP/TCP RST packets in other direction. Actual packet | |
479 | which created connection will be IP_CT_NEW or for an | |
480 | expected connection, IP_CT_RELATED. */ | |
481 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
482 | return NF_ACCEPT; | |
483 | ||
5d0aa2cc | 484 | zone = nf_ct_zone(ct); |
99f07e91 CG |
485 | /* reuse the hash saved before */ |
486 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
487 | hash = hash_bucket(hash, net); | |
488 | repl_hash = hash_conntrack(net, zone, | |
489 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
9fb9cbb1 YK |
490 | |
491 | /* We're not in hash table, and we refuse to set up related | |
492 | connections for unconfirmed conns. But packet copies and | |
493 | REJECT will give spurious warnings here. */ | |
494 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
495 | ||
25985edc | 496 | /* No external references means no one else could have |
9fb9cbb1 YK |
497 | confirmed us. */ |
498 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
4b9e9796 | 499 | pr_debug("Confirming conntrack %pK\n", ct); |
9fb9cbb1 | 500 | |
f8ba1aff | 501 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 502 | |
fc350777 JM |
503 | /* We have to check the DYING flag inside the lock to prevent |
504 | a race against nf_ct_get_next_corpse() possibly called from | |
505 | user context, else we insert an already 'dead' hash, blocking | |
506 | further use of that particular connection -JM */ | |
507 | ||
508 | if (unlikely(nf_ct_is_dying(ct))) { | |
509 | spin_unlock_bh(&nf_conntrack_lock); | |
510 | return NF_ACCEPT; | |
511 | } | |
512 | ||
9fb9cbb1 YK |
513 | /* See if there's one in the list already, including reverse: |
514 | NAT could have grabbed it without realizing, since we're | |
515 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 516 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc | 517 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
5d0aa2cc PM |
518 | &h->tuple) && |
519 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 520 | goto out; |
ea781f19 | 521 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc | 522 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
5d0aa2cc PM |
523 | &h->tuple) && |
524 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 525 | goto out; |
9fb9cbb1 | 526 | |
df0933dc | 527 | /* Remove from unconfirmed list */ |
ea781f19 | 528 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc | 529 | |
df0933dc PM |
530 | /* Timer relative to confirmation time, not original |
531 | setting time, otherwise we'd get timer wrap in | |
532 | weird delay cases. */ | |
533 | ct->timeout.expires += jiffies; | |
534 | add_timer(&ct->timeout); | |
535 | atomic_inc(&ct->ct_general.use); | |
45eec341 | 536 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 537 | |
a992ca2a PNA |
538 | /* set conntrack timestamp, if enabled. */ |
539 | tstamp = nf_conn_tstamp_find(ct); | |
540 | if (tstamp) { | |
541 | if (skb->tstamp.tv64 == 0) | |
e3192690 | 542 | __net_timestamp(skb); |
a992ca2a PNA |
543 | |
544 | tstamp->start = ktime_to_ns(skb->tstamp); | |
545 | } | |
5c8ec910 PM |
546 | /* Since the lookup is lockless, hash insertion must be done after |
547 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
548 | * guarantee that no other CPU can find the conntrack before the above | |
549 | * stores are visible. | |
550 | */ | |
551 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
0d55af87 | 552 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 553 | spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910 | 554 | |
df0933dc PM |
555 | help = nfct_help(ct); |
556 | if (help && help->helper) | |
a71996fc | 557 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 558 | |
df0933dc | 559 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 560 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 561 | return NF_ACCEPT; |
9fb9cbb1 | 562 | |
df0933dc | 563 | out: |
0d55af87 | 564 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 565 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
566 | return NF_DROP; |
567 | } | |
13b18339 | 568 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
569 | |
570 | /* Returns true if a connection correspondings to the tuple (required | |
571 | for NAT). */ | |
572 | int | |
573 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
574 | const struct nf_conn *ignored_conntrack) | |
575 | { | |
400dad39 | 576 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 577 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 578 | struct hlist_nulls_node *n; |
5d0aa2cc PM |
579 | struct nf_conn *ct; |
580 | u16 zone = nf_ct_zone(ignored_conntrack); | |
581 | unsigned int hash = hash_conntrack(net, zone, tuple); | |
9fb9cbb1 | 582 | |
4e29e9ec PM |
583 | /* Disable BHs the entire time since we need to disable them at |
584 | * least once for the stats anyway. | |
585 | */ | |
586 | rcu_read_lock_bh(); | |
ea781f19 | 587 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
5d0aa2cc PM |
588 | ct = nf_ct_tuplehash_to_ctrack(h); |
589 | if (ct != ignored_conntrack && | |
590 | nf_ct_tuple_equal(tuple, &h->tuple) && | |
591 | nf_ct_zone(ct) == zone) { | |
0d55af87 | 592 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 593 | rcu_read_unlock_bh(); |
ba419aff PM |
594 | return 1; |
595 | } | |
0d55af87 | 596 | NF_CT_STAT_INC(net, searched); |
ba419aff | 597 | } |
4e29e9ec | 598 | rcu_read_unlock_bh(); |
9fb9cbb1 | 599 | |
ba419aff | 600 | return 0; |
9fb9cbb1 | 601 | } |
13b18339 | 602 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 603 | |
7ae7730f PM |
604 | #define NF_CT_EVICTION_RANGE 8 |
605 | ||
9fb9cbb1 YK |
606 | /* There's a small race here where we may free a just-assured |
607 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 608 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 609 | { |
f205c5e0 | 610 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 611 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 612 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 613 | struct hlist_nulls_node *n; |
7ae7730f | 614 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
615 | int dropped = 0; |
616 | ||
76507f69 | 617 | rcu_read_lock(); |
d696c7bd | 618 | for (i = 0; i < net->ct.htable_size; i++) { |
ea781f19 ED |
619 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
620 | hnnode) { | |
7ae7730f PM |
621 | tmp = nf_ct_tuplehash_to_ctrack(h); |
622 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
623 | ct = tmp; | |
624 | cnt++; | |
625 | } | |
76507f69 | 626 | |
5ae27aa2 CG |
627 | if (ct != NULL) { |
628 | if (likely(!nf_ct_is_dying(ct) && | |
629 | atomic_inc_not_zero(&ct->ct_general.use))) | |
630 | break; | |
631 | else | |
632 | ct = NULL; | |
633 | } | |
634 | ||
635 | if (cnt >= NF_CT_EVICTION_RANGE) | |
7ae7730f | 636 | break; |
5ae27aa2 | 637 | |
d696c7bd | 638 | hash = (hash + 1) % net->ct.htable_size; |
9fb9cbb1 | 639 | } |
76507f69 | 640 | rcu_read_unlock(); |
9fb9cbb1 YK |
641 | |
642 | if (!ct) | |
643 | return dropped; | |
644 | ||
645 | if (del_timer(&ct->timeout)) { | |
646 | death_by_timeout((unsigned long)ct); | |
74138511 PNA |
647 | /* Check if we indeed killed this entry. Reliable event |
648 | delivery may have inserted it into the dying list. */ | |
649 | if (test_bit(IPS_DYING_BIT, &ct->status)) { | |
650 | dropped = 1; | |
651 | NF_CT_STAT_INC_ATOMIC(net, early_drop); | |
652 | } | |
9fb9cbb1 YK |
653 | } |
654 | nf_ct_put(ct); | |
655 | return dropped; | |
656 | } | |
657 | ||
f682cefa CG |
658 | void init_nf_conntrack_hash_rnd(void) |
659 | { | |
660 | unsigned int rand; | |
661 | ||
662 | /* | |
663 | * Why not initialize nf_conntrack_rnd in a "init()" function ? | |
664 | * Because there isn't enough entropy when system initializing, | |
665 | * and we initialize it as late as possible. | |
666 | */ | |
667 | do { | |
668 | get_random_bytes(&rand, sizeof(rand)); | |
669 | } while (!rand); | |
670 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); | |
671 | } | |
672 | ||
99f07e91 CG |
673 | static struct nf_conn * |
674 | __nf_conntrack_alloc(struct net *net, u16 zone, | |
675 | const struct nf_conntrack_tuple *orig, | |
676 | const struct nf_conntrack_tuple *repl, | |
677 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 678 | { |
cd7fcbf1 | 679 | struct nf_conn *ct; |
9fb9cbb1 | 680 | |
b2390969 | 681 | if (unlikely(!nf_conntrack_hash_rnd)) { |
f682cefa | 682 | init_nf_conntrack_hash_rnd(); |
99f07e91 CG |
683 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
684 | hash = hash_conntrack_raw(orig, zone); | |
9fb9cbb1 YK |
685 | } |
686 | ||
5251e2d2 | 687 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 688 | atomic_inc(&net->ct.count); |
5251e2d2 | 689 | |
76eb9460 | 690 | if (nf_conntrack_max && |
49ac8713 | 691 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
99f07e91 | 692 | if (!early_drop(net, hash_bucket(hash, net))) { |
49ac8713 | 693 | atomic_dec(&net->ct.count); |
e87cc472 | 694 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
695 | return ERR_PTR(-ENOMEM); |
696 | } | |
697 | } | |
698 | ||
941297f4 ED |
699 | /* |
700 | * Do not use kmem_cache_zalloc(), as this cache uses | |
701 | * SLAB_DESTROY_BY_RCU. | |
702 | */ | |
5b3501fa | 703 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
c88130bc | 704 | if (ct == NULL) { |
49ac8713 | 705 | atomic_dec(&net->ct.count); |
dacd2a1a | 706 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 707 | } |
941297f4 ED |
708 | /* |
709 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next | |
710 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. | |
711 | */ | |
712 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, | |
e5fc9e7a CG |
713 | offsetof(struct nf_conn, proto) - |
714 | offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); | |
440f0d58 | 715 | spin_lock_init(&ct->lock); |
c88130bc | 716 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 717 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 718 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
719 | /* save hash for reusing when confirming */ |
720 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
9fb9cbb1 | 721 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 722 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9b | 723 | write_pnet(&ct->ct_net, net); |
5d0aa2cc PM |
724 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
725 | if (zone) { | |
726 | struct nf_conntrack_zone *nf_ct_zone; | |
727 | ||
728 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); | |
729 | if (!nf_ct_zone) | |
730 | goto out_free; | |
731 | nf_ct_zone->id = zone; | |
732 | } | |
733 | #endif | |
941297f4 ED |
734 | /* |
735 | * changes to lookup keys must be done before setting refcnt to 1 | |
736 | */ | |
737 | smp_wmb(); | |
738 | atomic_set(&ct->ct_general.use, 1); | |
c88130bc | 739 | return ct; |
5d0aa2cc PM |
740 | |
741 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
742 | out_free: | |
d96fc659 | 743 | atomic_dec(&net->ct.count); |
5d0aa2cc PM |
744 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
745 | return ERR_PTR(-ENOMEM); | |
746 | #endif | |
9fb9cbb1 | 747 | } |
99f07e91 CG |
748 | |
749 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, | |
750 | const struct nf_conntrack_tuple *orig, | |
751 | const struct nf_conntrack_tuple *repl, | |
752 | gfp_t gfp) | |
753 | { | |
754 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
755 | } | |
13b18339 | 756 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 757 | |
c88130bc | 758 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 759 | { |
1d45209d ED |
760 | struct net *net = nf_ct_net(ct); |
761 | ||
ceeff754 | 762 | nf_ct_ext_destroy(ct); |
1d45209d | 763 | atomic_dec(&net->ct.count); |
ea781f19 | 764 | nf_ct_ext_free(ct); |
5b3501fa | 765 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
76507f69 | 766 | } |
13b18339 | 767 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 768 | |
c539f017 | 769 | |
9fb9cbb1 YK |
770 | /* Allocate a new conntrack: we return -ENOMEM if classification |
771 | failed due to stress. Otherwise it really is unclassifiable. */ | |
772 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 773 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 774 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 775 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 776 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 777 | struct sk_buff *skb, |
60b5f8f7 | 778 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 779 | { |
c88130bc | 780 | struct nf_conn *ct; |
3c158f7f | 781 | struct nf_conn_help *help; |
9fb9cbb1 | 782 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 783 | struct nf_conntrack_ecache *ecache; |
9fb9cbb1 | 784 | struct nf_conntrack_expect *exp; |
5d0aa2cc | 785 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
60b5f8f7 PNA |
786 | struct nf_conn_timeout *timeout_ext; |
787 | unsigned int *timeouts; | |
9fb9cbb1 | 788 | |
605dcad6 | 789 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 790 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
791 | return NULL; |
792 | } | |
793 | ||
99f07e91 CG |
794 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
795 | hash); | |
0a9ee813 | 796 | if (IS_ERR(ct)) |
c88130bc | 797 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 798 | |
60b5f8f7 PNA |
799 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
800 | if (timeout_ext) | |
801 | timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext); | |
802 | else | |
803 | timeouts = l4proto->get_timeouts(net); | |
804 | ||
2c8503f5 | 805 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 806 | nf_conntrack_free(ct); |
0d53778e | 807 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
808 | return NULL; |
809 | } | |
810 | ||
60b5f8f7 PNA |
811 | if (timeout_ext) |
812 | nf_ct_timeout_ext_add(ct, timeout_ext->timeout, GFP_ATOMIC); | |
813 | ||
58401572 | 814 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 815 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 816 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
817 | |
818 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
819 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
820 | ecache ? ecache->expmask : 0, | |
821 | GFP_ATOMIC); | |
58401572 | 822 | |
f8ba1aff | 823 | spin_lock_bh(&nf_conntrack_lock); |
5d0aa2cc | 824 | exp = nf_ct_find_expectation(net, zone, tuple); |
9fb9cbb1 | 825 | if (exp) { |
4b9e9796 | 826 | pr_debug("conntrack: expectation arrives ct=%pK exp=%pK\n", |
c88130bc | 827 | ct, exp); |
9fb9cbb1 | 828 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
829 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
830 | ct->master = exp->master; | |
ceceae1b | 831 | if (exp->helper) { |
1afc5679 PNA |
832 | help = nf_ct_helper_ext_add(ct, exp->helper, |
833 | GFP_ATOMIC); | |
ceceae1b | 834 | if (help) |
cf778b00 | 835 | rcu_assign_pointer(help->helper, exp->helper); |
ceceae1b YK |
836 | } |
837 | ||
9fb9cbb1 | 838 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 839 | ct->mark = exp->master->mark; |
7c9728c3 JM |
840 | #endif |
841 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 842 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 843 | #endif |
c88130bc | 844 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 845 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 846 | } else { |
b2a15a60 | 847 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af87 | 848 | NF_CT_STAT_INC(net, new); |
22e7410b | 849 | } |
9fb9cbb1 YK |
850 | |
851 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 852 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 853 | &net->ct.unconfirmed); |
9fb9cbb1 | 854 | |
f8ba1aff | 855 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
856 | |
857 | if (exp) { | |
858 | if (exp->expectfn) | |
c88130bc | 859 | exp->expectfn(ct, exp); |
6823645d | 860 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
861 | } |
862 | ||
c88130bc | 863 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
864 | } |
865 | ||
866 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
867 | static inline struct nf_conn * | |
b2a15a60 | 868 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 869 | struct sk_buff *skb, |
9fb9cbb1 YK |
870 | unsigned int dataoff, |
871 | u_int16_t l3num, | |
872 | u_int8_t protonum, | |
873 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 874 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 875 | int *set_reply, |
60b5f8f7 | 876 | enum ip_conntrack_info *ctinfo) |
9fb9cbb1 YK |
877 | { |
878 | struct nf_conntrack_tuple tuple; | |
879 | struct nf_conntrack_tuple_hash *h; | |
880 | struct nf_conn *ct; | |
5d0aa2cc | 881 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
99f07e91 | 882 | u32 hash; |
9fb9cbb1 | 883 | |
bbe735e4 | 884 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 885 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 886 | l4proto)) { |
0d53778e | 887 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
888 | return NULL; |
889 | } | |
890 | ||
891 | /* look for tuple match */ | |
99f07e91 CG |
892 | hash = hash_conntrack_raw(&tuple, zone); |
893 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); | |
9fb9cbb1 | 894 | if (!h) { |
b2a15a60 | 895 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 896 | skb, dataoff, hash); |
9fb9cbb1 YK |
897 | if (!h) |
898 | return NULL; | |
899 | if (IS_ERR(h)) | |
900 | return (void *)h; | |
901 | } | |
902 | ct = nf_ct_tuplehash_to_ctrack(h); | |
903 | ||
904 | /* It exists; we have (non-exclusive) reference. */ | |
905 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fb048833 | 906 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
907 | /* Please set reply bit if this packet OK */ |
908 | *set_reply = 1; | |
909 | } else { | |
910 | /* Once we've had two way comms, always ESTABLISHED. */ | |
911 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
4b9e9796 | 912 | pr_debug("nf_conntrack_in: normal packet for %pK\n", ct); |
9fb9cbb1 YK |
913 | *ctinfo = IP_CT_ESTABLISHED; |
914 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
4b9e9796 | 915 | pr_debug("nf_conntrack_in: related packet for %pK\n", |
0d53778e | 916 | ct); |
9fb9cbb1 YK |
917 | *ctinfo = IP_CT_RELATED; |
918 | } else { | |
4b9e9796 | 919 | pr_debug("nf_conntrack_in: new packet for %pK\n", ct); |
9fb9cbb1 YK |
920 | *ctinfo = IP_CT_NEW; |
921 | } | |
922 | *set_reply = 0; | |
923 | } | |
924 | skb->nfct = &ct->ct_general; | |
925 | skb->nfctinfo = *ctinfo; | |
926 | return ct; | |
927 | } | |
928 | ||
929 | unsigned int | |
a702a65f AD |
930 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
931 | struct sk_buff *skb) | |
9fb9cbb1 | 932 | { |
b2a15a60 | 933 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
934 | enum ip_conntrack_info ctinfo; |
935 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 936 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 937 | unsigned int *timeouts; |
9fb9cbb1 YK |
938 | unsigned int dataoff; |
939 | u_int8_t protonum; | |
940 | int set_reply = 0; | |
941 | int ret; | |
942 | ||
3db05fea | 943 | if (skb->nfct) { |
b2a15a60 PM |
944 | /* Previously seen (loopback or untracked)? Ignore. */ |
945 | tmpl = (struct nf_conn *)skb->nfct; | |
946 | if (!nf_ct_is_template(tmpl)) { | |
947 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
948 | return NF_ACCEPT; | |
949 | } | |
950 | skb->nfct = NULL; | |
9fb9cbb1 YK |
951 | } |
952 | ||
923f4902 | 953 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 954 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 955 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
956 | &dataoff, &protonum); |
957 | if (ret <= 0) { | |
25985edc | 958 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
959 | NF_CT_STAT_INC_ATOMIC(net, error); |
960 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
961 | ret = -ret; |
962 | goto out; | |
9fb9cbb1 YK |
963 | } |
964 | ||
76108cea | 965 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
966 | |
967 | /* It may be an special packet, error, unclean... | |
968 | * inverse of the return code tells to the netfilter | |
969 | * core what to do with the packet. */ | |
74c51a14 | 970 | if (l4proto->error != NULL) { |
8fea97ec PM |
971 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
972 | pf, hooknum); | |
74c51a14 | 973 | if (ret <= 0) { |
0d55af87 AD |
974 | NF_CT_STAT_INC_ATOMIC(net, error); |
975 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
976 | ret = -ret; |
977 | goto out; | |
74c51a14 | 978 | } |
88ed01d1 PNA |
979 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
980 | if (skb->nfct) | |
981 | goto out; | |
9fb9cbb1 YK |
982 | } |
983 | ||
b2a15a60 | 984 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
60b5f8f7 | 985 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
986 | if (!ct) { |
987 | /* Not valid part of a connection */ | |
0d55af87 | 988 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
989 | ret = NF_ACCEPT; |
990 | goto out; | |
9fb9cbb1 YK |
991 | } |
992 | ||
993 | if (IS_ERR(ct)) { | |
994 | /* Too stressed to deal. */ | |
0d55af87 | 995 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
996 | ret = NF_DROP; |
997 | goto out; | |
9fb9cbb1 YK |
998 | } |
999 | ||
3db05fea | 1000 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 1001 | |
60b5f8f7 | 1002 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1003 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1004 | |
2c8503f5 | 1005 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1006 | if (ret <= 0) { |
9fb9cbb1 YK |
1007 | /* Invalid: inverse of the return code tells |
1008 | * the netfilter core what to do */ | |
0d53778e | 1009 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
1010 | nf_conntrack_put(skb->nfct); |
1011 | skb->nfct = NULL; | |
0d55af87 | 1012 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1013 | if (ret == -NF_DROP) |
1014 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
1015 | ret = -ret; |
1016 | goto out; | |
9fb9cbb1 YK |
1017 | } |
1018 | ||
1019 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1020 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1021 | out: |
c3174286 PNA |
1022 | if (tmpl) { |
1023 | /* Special case: we have to repeat this hook, assign the | |
1024 | * template again to this packet. We assume that this packet | |
1025 | * has no conntrack assigned. This is used by nf_ct_tcp. */ | |
1026 | if (ret == NF_REPEAT) | |
1027 | skb->nfct = (struct nf_conntrack *)tmpl; | |
1028 | else | |
1029 | nf_ct_put(tmpl); | |
1030 | } | |
9fb9cbb1 YK |
1031 | |
1032 | return ret; | |
1033 | } | |
13b18339 | 1034 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1035 | |
5f2b4c90 JE |
1036 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1037 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1038 | { |
5f2b4c90 | 1039 | bool ret; |
923f4902 PM |
1040 | |
1041 | rcu_read_lock(); | |
1042 | ret = nf_ct_invert_tuple(inverse, orig, | |
1043 | __nf_ct_l3proto_find(orig->src.l3num), | |
1044 | __nf_ct_l4proto_find(orig->src.l3num, | |
1045 | orig->dst.protonum)); | |
1046 | rcu_read_unlock(); | |
1047 | return ret; | |
9fb9cbb1 | 1048 | } |
13b18339 | 1049 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1050 | |
5b1158e9 JK |
1051 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1052 | implicitly racy: see __nf_conntrack_confirm */ | |
1053 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1054 | const struct nf_conntrack_tuple *newreply) | |
1055 | { | |
1056 | struct nf_conn_help *help = nfct_help(ct); | |
1057 | ||
5b1158e9 JK |
1058 | /* Should be unconfirmed, so not in hash table yet */ |
1059 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1060 | ||
4b9e9796 | 1061 | pr_debug("Altering reply tuple of %pK to ", ct); |
3c9fba65 | 1062 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1063 | |
1064 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1065 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1066 | return; |
ceceae1b | 1067 | |
c52fbb41 | 1068 | rcu_read_lock(); |
b2a15a60 | 1069 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1070 | rcu_read_unlock(); |
5b1158e9 | 1071 | } |
13b18339 | 1072 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1073 | |
9fb9cbb1 YK |
1074 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1075 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1076 | enum ip_conntrack_info ctinfo, | |
1077 | const struct sk_buff *skb, | |
1078 | unsigned long extra_jiffies, | |
1079 | int do_acct) | |
1080 | { | |
9fb9cbb1 YK |
1081 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
1082 | NF_CT_ASSERT(skb); | |
1083 | ||
997ae831 | 1084 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1085 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1086 | goto acct; | |
997ae831 | 1087 | |
9fb9cbb1 YK |
1088 | /* If not in hash table, timer will not be active yet */ |
1089 | if (!nf_ct_is_confirmed(ct)) { | |
1090 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 1091 | } else { |
be00c8e4 MJ |
1092 | unsigned long newtime = jiffies + extra_jiffies; |
1093 | ||
1094 | /* Only update the timeout if the new timeout is at least | |
1095 | HZ jiffies from the old timeout. Need del_timer for race | |
1096 | avoidance (may already be dying). */ | |
65cb9fda PM |
1097 | if (newtime - ct->timeout.expires >= HZ) |
1098 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
1099 | } |
1100 | ||
47d95045 | 1101 | acct: |
9fb9cbb1 | 1102 | if (do_acct) { |
58401572 | 1103 | struct nf_conn_counter *acct; |
3ffd5eeb | 1104 | |
58401572 KPO |
1105 | acct = nf_conn_acct_find(ct); |
1106 | if (acct) { | |
b3e0bfa7 ED |
1107 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1108 | atomic64_add(skb->len, &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1109 | } |
9fb9cbb1 | 1110 | } |
9fb9cbb1 | 1111 | } |
13b18339 | 1112 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1113 | |
4c889498 DM |
1114 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
1115 | enum ip_conntrack_info ctinfo, | |
1116 | const struct sk_buff *skb, | |
1117 | int do_acct) | |
51091764 | 1118 | { |
718d4ad9 | 1119 | if (do_acct) { |
58401572 KPO |
1120 | struct nf_conn_counter *acct; |
1121 | ||
58401572 KPO |
1122 | acct = nf_conn_acct_find(ct); |
1123 | if (acct) { | |
b3e0bfa7 ED |
1124 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1125 | atomic64_add(skb->len - skb_network_offset(skb), | |
1126 | &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1127 | } |
718d4ad9 | 1128 | } |
58401572 | 1129 | |
4c889498 | 1130 | if (del_timer(&ct->timeout)) { |
51091764 | 1131 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
1132 | return true; |
1133 | } | |
1134 | return false; | |
51091764 | 1135 | } |
718d4ad9 | 1136 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 1137 | |
5d0aa2cc PM |
1138 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1139 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { | |
1140 | .len = sizeof(struct nf_conntrack_zone), | |
1141 | .align = __alignof__(struct nf_conntrack_zone), | |
1142 | .id = NF_CT_EXT_ZONE, | |
1143 | }; | |
1144 | #endif | |
1145 | ||
c0cd1156 | 1146 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1147 | |
1148 | #include <linux/netfilter/nfnetlink.h> | |
1149 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1150 | #include <linux/mutex.h> |
1151 | ||
c1d10adb PNA |
1152 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1153 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1154 | * or depend on ctnetlink */ | |
fdf70832 | 1155 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1156 | const struct nf_conntrack_tuple *tuple) |
1157 | { | |
bae65be8 DM |
1158 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1159 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1160 | goto nla_put_failure; | |
c1d10adb PNA |
1161 | return 0; |
1162 | ||
df6fb868 | 1163 | nla_put_failure: |
c1d10adb PNA |
1164 | return -1; |
1165 | } | |
fdf70832 | 1166 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1167 | |
f73e924c PM |
1168 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1169 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1170 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1171 | }; |
f73e924c | 1172 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1173 | |
fdf70832 | 1174 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1175 | struct nf_conntrack_tuple *t) |
1176 | { | |
df6fb868 | 1177 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1178 | return -EINVAL; |
1179 | ||
77236b6e PM |
1180 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1181 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1182 | |
1183 | return 0; | |
1184 | } | |
fdf70832 | 1185 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1186 | |
1187 | int nf_ct_port_nlattr_tuple_size(void) | |
1188 | { | |
1189 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1190 | } | |
1191 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1192 | #endif |
1193 | ||
9fb9cbb1 | 1194 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc | 1195 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb1 YK |
1196 | { |
1197 | struct nf_conn *ct; | |
1198 | enum ip_conntrack_info ctinfo; | |
1199 | ||
1200 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1201 | ct = nf_ct_get(skb, &ctinfo); | |
1202 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1203 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1204 | else |
1205 | ctinfo = IP_CT_RELATED; | |
1206 | ||
1207 | /* Attach to new skbuff, and increment count */ | |
1208 | nskb->nfct = &ct->ct_general; | |
1209 | nskb->nfctinfo = ctinfo; | |
1210 | nf_conntrack_get(nskb->nfct); | |
1211 | } | |
1212 | ||
9fb9cbb1 | 1213 | /* Bring out ya dead! */ |
df0933dc | 1214 | static struct nf_conn * |
400dad39 | 1215 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1216 | void *data, unsigned int *bucket) |
1217 | { | |
df0933dc PM |
1218 | struct nf_conntrack_tuple_hash *h; |
1219 | struct nf_conn *ct; | |
ea781f19 | 1220 | struct hlist_nulls_node *n; |
9fb9cbb1 | 1221 | |
f8ba1aff | 1222 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1223 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
ea781f19 | 1224 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
b0cdb1d9 PM |
1225 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1226 | continue; | |
df0933dc PM |
1227 | ct = nf_ct_tuplehash_to_ctrack(h); |
1228 | if (iter(ct, data)) | |
1229 | goto found; | |
1230 | } | |
601e68e1 | 1231 | } |
ea781f19 | 1232 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
1233 | ct = nf_ct_tuplehash_to_ctrack(h); |
1234 | if (iter(ct, data)) | |
ec68e97d | 1235 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 1236 | } |
f8ba1aff | 1237 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
1238 | return NULL; |
1239 | found: | |
c073e3fa | 1240 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1241 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1242 | return ct; |
9fb9cbb1 YK |
1243 | } |
1244 | ||
400dad39 AD |
1245 | void nf_ct_iterate_cleanup(struct net *net, |
1246 | int (*iter)(struct nf_conn *i, void *data), | |
1247 | void *data) | |
9fb9cbb1 | 1248 | { |
df0933dc | 1249 | struct nf_conn *ct; |
9fb9cbb1 YK |
1250 | unsigned int bucket = 0; |
1251 | ||
400dad39 | 1252 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1253 | /* Time to push up daises... */ |
1254 | if (del_timer(&ct->timeout)) | |
1255 | death_by_timeout((unsigned long)ct); | |
1256 | /* ... else the timer will get him soon. */ | |
1257 | ||
1258 | nf_ct_put(ct); | |
1259 | } | |
1260 | } | |
13b18339 | 1261 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1262 | |
19abb7b0 | 1263 | struct __nf_ct_flush_report { |
ec464e5d | 1264 | u32 portid; |
19abb7b0 PNA |
1265 | int report; |
1266 | }; | |
1267 | ||
274d383b | 1268 | static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb1 | 1269 | { |
19abb7b0 | 1270 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
a992ca2a PNA |
1271 | struct nf_conn_tstamp *tstamp; |
1272 | ||
1273 | tstamp = nf_conn_tstamp_find(i); | |
1274 | if (tstamp && tstamp->stop == 0) | |
1275 | tstamp->stop = ktime_to_ns(ktime_get_real()); | |
19abb7b0 | 1276 | |
dd7669a9 PNA |
1277 | /* If we fail to deliver the event, death_by_timeout() will retry */ |
1278 | if (nf_conntrack_event_report(IPCT_DESTROY, i, | |
ec464e5d | 1279 | fr->portid, fr->report) < 0) |
dd7669a9 PNA |
1280 | return 1; |
1281 | ||
1282 | /* Avoid the delivery of the destroy event in death_by_timeout(). */ | |
1283 | set_bit(IPS_DYING_BIT, &i->status); | |
9fb9cbb1 YK |
1284 | return 1; |
1285 | } | |
1286 | ||
274d383b PNA |
1287 | static int kill_all(struct nf_conn *i, void *data) |
1288 | { | |
1289 | return 1; | |
1290 | } | |
1291 | ||
d862a662 | 1292 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1293 | { |
d862a662 | 1294 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1295 | vfree(hash); |
1296 | else | |
601e68e1 | 1297 | free_pages((unsigned long)hash, |
f205c5e0 | 1298 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1299 | } |
ac565e5f | 1300 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1301 | |
ec464e5d | 1302 | void nf_conntrack_flush_report(struct net *net, u32 portid, int report) |
c1d10adb | 1303 | { |
19abb7b0 | 1304 | struct __nf_ct_flush_report fr = { |
ec464e5d | 1305 | .portid = portid, |
19abb7b0 PNA |
1306 | .report = report, |
1307 | }; | |
274d383b | 1308 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb | 1309 | } |
274d383b | 1310 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1311 | |
ee254fa4 | 1312 | static void nf_ct_release_dying_list(struct net *net) |
dd7669a9 PNA |
1313 | { |
1314 | struct nf_conntrack_tuple_hash *h; | |
1315 | struct nf_conn *ct; | |
1316 | struct hlist_nulls_node *n; | |
1317 | ||
1318 | spin_lock_bh(&nf_conntrack_lock); | |
ee254fa4 | 1319 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a9 PNA |
1320 | ct = nf_ct_tuplehash_to_ctrack(h); |
1321 | /* never fails to remove them, no listeners at this point */ | |
1322 | nf_ct_kill(ct); | |
1323 | } | |
1324 | spin_unlock_bh(&nf_conntrack_lock); | |
1325 | } | |
1326 | ||
b3c5163f ED |
1327 | static int untrack_refs(void) |
1328 | { | |
1329 | int cnt = 0, cpu; | |
1330 | ||
1331 | for_each_possible_cpu(cpu) { | |
1332 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1333 | ||
1334 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1335 | } | |
1336 | return cnt; | |
1337 | } | |
1338 | ||
f94161c1 | 1339 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1340 | { |
f94161c1 G |
1341 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1342 | } | |
1343 | ||
1344 | void nf_conntrack_cleanup_end(void) | |
1345 | { | |
1346 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1347 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1348 | schedule(); |
1349 | ||
5d0aa2cc PM |
1350 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1351 | nf_ct_extend_unregister(&nf_ct_zone_extend); | |
1352 | #endif | |
04d87001 | 1353 | nf_conntrack_proto_fini(); |
5f69b8f5 | 1354 | nf_conntrack_labels_fini(); |
5e615b22 | 1355 | nf_conntrack_helper_fini(); |
8684094c | 1356 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1357 | nf_conntrack_ecache_fini(); |
73f4001a | 1358 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1359 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1360 | nf_conntrack_expect_fini(); |
08f6547d | 1361 | } |
9fb9cbb1 | 1362 | |
f94161c1 G |
1363 | /* |
1364 | * Mishearing the voices in his head, our hero wonders how he's | |
1365 | * supposed to kill the mall. | |
1366 | */ | |
1367 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1368 | { |
dece40e8 VD |
1369 | LIST_HEAD(single); |
1370 | ||
1371 | list_add(&net->exit_list, &single); | |
1372 | nf_conntrack_cleanup_net_list(&single); | |
1373 | } | |
1374 | ||
1375 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1376 | { | |
1377 | int busy; | |
1378 | struct net *net; | |
1379 | ||
f94161c1 G |
1380 | /* |
1381 | * This makes sure all current packets have passed through | |
1382 | * netfilter framework. Roll on, two-stage module | |
1383 | * delete... | |
1384 | */ | |
1385 | synchronize_net(); | |
dece40e8 VD |
1386 | i_see_dead_people: |
1387 | busy = 0; | |
1388 | list_for_each_entry(net, net_exit_list, exit_list) { | |
1389 | nf_ct_iterate_cleanup(net, kill_all, NULL); | |
1390 | nf_ct_release_dying_list(net); | |
1391 | if (atomic_read(&net->ct.count) != 0) | |
1392 | busy = 1; | |
1393 | } | |
1394 | if (busy) { | |
9fb9cbb1 YK |
1395 | schedule(); |
1396 | goto i_see_dead_people; | |
1397 | } | |
1398 | ||
dece40e8 VD |
1399 | list_for_each_entry(net, net_exit_list, exit_list) { |
1400 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); | |
1401 | nf_conntrack_proto_pernet_fini(net); | |
1402 | nf_conntrack_helper_pernet_fini(net); | |
1403 | nf_conntrack_ecache_pernet_fini(net); | |
1404 | nf_conntrack_tstamp_pernet_fini(net); | |
1405 | nf_conntrack_acct_pernet_fini(net); | |
1406 | nf_conntrack_expect_pernet_fini(net); | |
1407 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); | |
1408 | kfree(net->ct.slabname); | |
1409 | free_percpu(net->ct.stat); | |
1410 | } | |
08f6547d AD |
1411 | } |
1412 | ||
d862a662 | 1413 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1414 | { |
ea781f19 ED |
1415 | struct hlist_nulls_head *hash; |
1416 | unsigned int nr_slots, i; | |
1417 | size_t sz; | |
9fb9cbb1 | 1418 | |
ea781f19 ED |
1419 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1420 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1421 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1422 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1423 | get_order(sz)); | |
601e68e1 | 1424 | if (!hash) { |
9fb9cbb1 | 1425 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
966567b7 | 1426 | hash = vzalloc(sz); |
9fb9cbb1 YK |
1427 | } |
1428 | ||
ea781f19 ED |
1429 | if (hash && nulls) |
1430 | for (i = 0; i < nr_slots; i++) | |
1431 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1432 | |
1433 | return hash; | |
1434 | } | |
ac565e5f | 1435 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1436 | |
fae718dd | 1437 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1438 | { |
4b5511eb | 1439 | int i, bucket, rc; |
96eb24d7 | 1440 | unsigned int hashsize, old_size; |
ea781f19 | 1441 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1442 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1443 | struct nf_conn *ct; |
9fb9cbb1 | 1444 | |
d696c7bd PM |
1445 | if (current->nsproxy->net_ns != &init_net) |
1446 | return -EOPNOTSUPP; | |
1447 | ||
9fb9cbb1 YK |
1448 | /* On boot, we can set this without any fancy locking. */ |
1449 | if (!nf_conntrack_htable_size) | |
1450 | return param_set_uint(val, kp); | |
1451 | ||
4b5511eb AP |
1452 | rc = kstrtouint(val, 0, &hashsize); |
1453 | if (rc) | |
1454 | return rc; | |
9fb9cbb1 YK |
1455 | if (!hashsize) |
1456 | return -EINVAL; | |
1457 | ||
d862a662 | 1458 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1459 | if (!hash) |
1460 | return -ENOMEM; | |
1461 | ||
76507f69 PM |
1462 | /* Lookups in the old hash might happen in parallel, which means we |
1463 | * might get false negatives during connection lookup. New connections | |
1464 | * created because of a false negative won't make it into the hash | |
1465 | * though since that required taking the lock. | |
1466 | */ | |
f8ba1aff | 1467 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1468 | for (i = 0; i < init_net.ct.htable_size; i++) { |
ea781f19 ED |
1469 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1470 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1471 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1472 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1473 | hlist_nulls_del_rcu(&h->hnnode); |
5d0aa2cc | 1474 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
99f07e91 | 1475 | hashsize); |
ea781f19 | 1476 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1477 | } |
1478 | } | |
d696c7bd | 1479 | old_size = init_net.ct.htable_size; |
400dad39 | 1480 | old_hash = init_net.ct.hash; |
9fb9cbb1 | 1481 | |
d696c7bd | 1482 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
400dad39 | 1483 | init_net.ct.hash = hash; |
f8ba1aff | 1484 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1485 | |
d862a662 | 1486 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1487 | return 0; |
1488 | } | |
fae718dd | 1489 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1490 | |
fae718dd | 1491 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1492 | &nf_conntrack_htable_size, 0600); |
1493 | ||
5bfddbd4 ED |
1494 | void nf_ct_untracked_status_or(unsigned long bits) |
1495 | { | |
b3c5163f ED |
1496 | int cpu; |
1497 | ||
1498 | for_each_possible_cpu(cpu) | |
1499 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1500 | } |
1501 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1502 | ||
f94161c1 | 1503 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1504 | { |
f205c5e0 | 1505 | int max_factor = 8; |
b3c5163f | 1506 | int ret, cpu; |
9fb9cbb1 YK |
1507 | |
1508 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1509 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1510 | if (!nf_conntrack_htable_size) { |
1511 | nf_conntrack_htable_size | |
4481374c | 1512 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1513 | / sizeof(struct hlist_head)); |
4481374c | 1514 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1515 | nf_conntrack_htable_size = 16384; |
1516 | if (nf_conntrack_htable_size < 32) | |
1517 | nf_conntrack_htable_size = 32; | |
1518 | ||
1519 | /* Use a max. factor of four by default to get the same max as | |
1520 | * with the old struct list_heads. When a table size is given | |
1521 | * we use the old value of 8 to avoid reducing the max. | |
1522 | * entries. */ | |
1523 | max_factor = 4; | |
9fb9cbb1 | 1524 | } |
f205c5e0 | 1525 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1526 | |
654d0fbd | 1527 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1528 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1529 | nf_conntrack_max); | |
83b4dbe1 G |
1530 | |
1531 | ret = nf_conntrack_expect_init(); | |
1532 | if (ret < 0) | |
1533 | goto err_expect; | |
1534 | ||
b7ff3a1f G |
1535 | ret = nf_conntrack_acct_init(); |
1536 | if (ret < 0) | |
1537 | goto err_acct; | |
1538 | ||
73f4001a G |
1539 | ret = nf_conntrack_tstamp_init(); |
1540 | if (ret < 0) | |
1541 | goto err_tstamp; | |
1542 | ||
3fe0f943 G |
1543 | ret = nf_conntrack_ecache_init(); |
1544 | if (ret < 0) | |
1545 | goto err_ecache; | |
1546 | ||
8684094c G |
1547 | ret = nf_conntrack_timeout_init(); |
1548 | if (ret < 0) | |
1549 | goto err_timeout; | |
1550 | ||
5e615b22 G |
1551 | ret = nf_conntrack_helper_init(); |
1552 | if (ret < 0) | |
1553 | goto err_helper; | |
1554 | ||
5f69b8f5 G |
1555 | ret = nf_conntrack_labels_init(); |
1556 | if (ret < 0) | |
1557 | goto err_labels; | |
1558 | ||
5d0aa2cc PM |
1559 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1560 | ret = nf_ct_extend_register(&nf_ct_zone_extend); | |
1561 | if (ret < 0) | |
1562 | goto err_extend; | |
1563 | #endif | |
04d87001 G |
1564 | ret = nf_conntrack_proto_init(); |
1565 | if (ret < 0) | |
1566 | goto err_proto; | |
1567 | ||
9edd7ca0 | 1568 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1569 | for_each_possible_cpu(cpu) { |
1570 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1571 | write_pnet(&ct->ct_net, &init_net); |
1572 | atomic_set(&ct->ct_general.use, 1); | |
1573 | } | |
9edd7ca0 | 1574 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1575 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d AD |
1576 | return 0; |
1577 | ||
04d87001 | 1578 | err_proto: |
5d0aa2cc | 1579 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
04d87001 | 1580 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
5d0aa2cc | 1581 | err_extend: |
a9006892 | 1582 | #endif |
04d87001 | 1583 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1584 | err_labels: |
1585 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1586 | err_helper: |
1587 | nf_conntrack_timeout_fini(); | |
8684094c G |
1588 | err_timeout: |
1589 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1590 | err_ecache: |
1591 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1592 | err_tstamp: |
1593 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1594 | err_acct: |
1595 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1596 | err_expect: |
08f6547d AD |
1597 | return ret; |
1598 | } | |
1599 | ||
f94161c1 G |
1600 | void nf_conntrack_init_end(void) |
1601 | { | |
1602 | /* For use by REJECT target */ | |
1603 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1604 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
1605 | ||
1606 | /* Howto get NAT offsets */ | |
1607 | RCU_INIT_POINTER(nf_ct_nat_offset, NULL); | |
1608 | } | |
1609 | ||
8cc20198 ED |
1610 | /* |
1611 | * We need to use special "null" values, not used in hash table | |
1612 | */ | |
1613 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1614 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1615 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1616 | |
f94161c1 | 1617 | int nf_conntrack_init_net(struct net *net) |
08f6547d AD |
1618 | { |
1619 | int ret; | |
ceceae1b | 1620 | |
08f6547d | 1621 | atomic_set(&net->ct.count, 0); |
8cc20198 ED |
1622 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
1623 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); | |
252b3e8c | 1624 | INIT_HLIST_NULLS_HEAD(&net->ct.tmpl, TEMPLATE_NULLS_VAL); |
08f6547d AD |
1625 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1626 | if (!net->ct.stat) { | |
1627 | ret = -ENOMEM; | |
1628 | goto err_stat; | |
1629 | } | |
5b3501fa | 1630 | |
4b9e9796 | 1631 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%pK", net); |
5b3501fa ED |
1632 | if (!net->ct.slabname) { |
1633 | ret = -ENOMEM; | |
1634 | goto err_slabname; | |
1635 | } | |
1636 | ||
1637 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, | |
1638 | sizeof(struct nf_conn), 0, | |
1639 | SLAB_DESTROY_BY_RCU, NULL); | |
1640 | if (!net->ct.nf_conntrack_cachep) { | |
1641 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); | |
1642 | ret = -ENOMEM; | |
1643 | goto err_cache; | |
1644 | } | |
d696c7bd PM |
1645 | |
1646 | net->ct.htable_size = nf_conntrack_htable_size; | |
d862a662 | 1647 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
08f6547d AD |
1648 | if (!net->ct.hash) { |
1649 | ret = -ENOMEM; | |
1650 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1651 | goto err_hash; | |
1652 | } | |
83b4dbe1 | 1653 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1654 | if (ret < 0) |
1655 | goto err_expect; | |
b7ff3a1f | 1656 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 1657 | if (ret < 0) |
08f6547d | 1658 | goto err_acct; |
73f4001a | 1659 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
1660 | if (ret < 0) |
1661 | goto err_tstamp; | |
3fe0f943 | 1662 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
1663 | if (ret < 0) |
1664 | goto err_ecache; | |
5e615b22 | 1665 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
1666 | if (ret < 0) |
1667 | goto err_helper; | |
04d87001 | 1668 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
1669 | if (ret < 0) |
1670 | goto err_proto; | |
08f6547d | 1671 | return 0; |
c539f017 | 1672 | |
f94161c1 | 1673 | err_proto: |
5e615b22 | 1674 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 1675 | err_helper: |
3fe0f943 | 1676 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 1677 | err_ecache: |
73f4001a | 1678 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 1679 | err_tstamp: |
b7ff3a1f | 1680 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 1681 | err_acct: |
83b4dbe1 | 1682 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 1683 | err_expect: |
d862a662 | 1684 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
6058fa6b | 1685 | err_hash: |
5b3501fa ED |
1686 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
1687 | err_cache: | |
1688 | kfree(net->ct.slabname); | |
1689 | err_slabname: | |
0d55af87 AD |
1690 | free_percpu(net->ct.stat); |
1691 | err_stat: | |
08f6547d AD |
1692 | return ret; |
1693 | } | |
1694 | ||
f9dd09c7 JK |
1695 | s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
1696 | enum ip_conntrack_dir dir, | |
1697 | u32 seq); | |
1698 | EXPORT_SYMBOL_GPL(nf_ct_nat_offset); |