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Commit | Line | Data |
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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 YK |
7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
12 | */ |
13 | ||
9fb9cbb1 YK |
14 | #include <linux/types.h> |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/proc_fs.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/random.h> | |
23 | #include <linux/jhash.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/percpu.h> | |
26 | #include <linux/moduleparam.h> | |
27 | #include <linux/notifier.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/socket.h> | |
d7fe0f24 | 31 | #include <linux/mm.h> |
ea781f19 | 32 | #include <linux/rculist_nulls.h> |
9fb9cbb1 | 33 | |
9fb9cbb1 YK |
34 | #include <net/netfilter/nf_conntrack.h> |
35 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 36 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 37 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 YK |
38 | #include <net/netfilter/nf_conntrack_helper.h> |
39 | #include <net/netfilter/nf_conntrack_core.h> | |
ecfab2c9 | 40 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 41 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 42 | #include <net/netfilter/nf_conntrack_ecache.h> |
e6a7d3c0 | 43 | #include <net/netfilter/nf_nat.h> |
e17b666a | 44 | #include <net/netfilter/nf_nat_core.h> |
9fb9cbb1 | 45 | |
dc808fe2 | 46 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 47 | |
e17b666a PM |
48 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
49 | enum nf_nat_manip_type manip, | |
50 | struct nlattr *attr) __read_mostly; | |
e6a7d3c0 PNA |
51 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
52 | ||
f8ba1aff | 53 | DEFINE_SPINLOCK(nf_conntrack_lock); |
13b18339 | 54 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
9fb9cbb1 | 55 | |
e2b7606c | 56 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
57 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
58 | ||
e478075c | 59 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 60 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 61 | |
e2b7606c | 62 | struct nf_conn nf_conntrack_untracked __read_mostly; |
13b18339 PM |
63 | EXPORT_SYMBOL_GPL(nf_conntrack_untracked); |
64 | ||
dacd2a1a | 65 | static struct kmem_cache *nf_conntrack_cachep __read_mostly; |
77ab9cff | 66 | |
9fb9cbb1 YK |
67 | static int nf_conntrack_hash_rnd_initted; |
68 | static unsigned int nf_conntrack_hash_rnd; | |
69 | ||
70 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, | |
71 | unsigned int size, unsigned int rnd) | |
72 | { | |
0794935e PM |
73 | unsigned int n; |
74 | u_int32_t h; | |
75 | ||
76 | /* The direction must be ignored, so we hash everything up to the | |
77 | * destination ports (which is a multiple of 4) and treat the last | |
78 | * three bytes manually. | |
79 | */ | |
80 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); | |
81 | h = jhash2((u32 *)tuple, n, | |
82 | rnd ^ (((__force __u16)tuple->dst.u.all << 16) | | |
83 | tuple->dst.protonum)); | |
84 | ||
85 | return ((u64)h * size) >> 32; | |
9fb9cbb1 YK |
86 | } |
87 | ||
88 | static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple) | |
89 | { | |
90 | return __hash_conntrack(tuple, nf_conntrack_htable_size, | |
91 | nf_conntrack_hash_rnd); | |
92 | } | |
93 | ||
5f2b4c90 | 94 | bool |
9fb9cbb1 YK |
95 | nf_ct_get_tuple(const struct sk_buff *skb, |
96 | unsigned int nhoff, | |
97 | unsigned int dataoff, | |
98 | u_int16_t l3num, | |
99 | u_int8_t protonum, | |
100 | struct nf_conntrack_tuple *tuple, | |
101 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 102 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 103 | { |
443a70d5 | 104 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
105 | |
106 | tuple->src.l3num = l3num; | |
107 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 108 | return false; |
9fb9cbb1 YK |
109 | |
110 | tuple->dst.protonum = protonum; | |
111 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
112 | ||
605dcad6 | 113 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
9fb9cbb1 | 114 | } |
13b18339 | 115 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 116 | |
5f2b4c90 JE |
117 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
118 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
119 | { |
120 | struct nf_conntrack_l3proto *l3proto; | |
121 | struct nf_conntrack_l4proto *l4proto; | |
122 | unsigned int protoff; | |
123 | u_int8_t protonum; | |
124 | int ret; | |
125 | ||
126 | rcu_read_lock(); | |
127 | ||
128 | l3proto = __nf_ct_l3proto_find(l3num); | |
129 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
130 | if (ret != NF_ACCEPT) { | |
131 | rcu_read_unlock(); | |
5f2b4c90 | 132 | return false; |
e2a3123f YK |
133 | } |
134 | ||
135 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
136 | ||
137 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, | |
138 | l3proto, l4proto); | |
139 | ||
140 | rcu_read_unlock(); | |
141 | return ret; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
144 | ||
5f2b4c90 | 145 | bool |
9fb9cbb1 YK |
146 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
147 | const struct nf_conntrack_tuple *orig, | |
148 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 149 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 150 | { |
443a70d5 | 151 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
152 | |
153 | inverse->src.l3num = orig->src.l3num; | |
154 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 155 | return false; |
9fb9cbb1 YK |
156 | |
157 | inverse->dst.dir = !orig->dst.dir; | |
158 | ||
159 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 160 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 161 | } |
13b18339 | 162 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 163 | |
9fb9cbb1 YK |
164 | static void |
165 | clean_from_lists(struct nf_conn *ct) | |
166 | { | |
0d53778e | 167 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
168 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
169 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
170 | |
171 | /* Destroy all pending expectations */ | |
c1d10adb | 172 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
173 | } |
174 | ||
175 | static void | |
176 | destroy_conntrack(struct nf_conntrack *nfct) | |
177 | { | |
178 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 179 | struct net *net = nf_ct_net(ct); |
605dcad6 | 180 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 181 | |
0d53778e | 182 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 YK |
183 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
184 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
185 | ||
19abb7b0 PNA |
186 | if (!test_bit(IPS_DYING_BIT, &ct->status)) |
187 | nf_conntrack_event(IPCT_DESTROY, ct); | |
9fb9cbb1 YK |
188 | set_bit(IPS_DYING_BIT, &ct->status); |
189 | ||
190 | /* To make sure we don't get any weird locking issues here: | |
191 | * destroy_conntrack() MUST NOT be called with a write lock | |
192 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 193 | rcu_read_lock(); |
5e8fbe2a | 194 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
195 | if (l4proto && l4proto->destroy) |
196 | l4proto->destroy(ct); | |
9fb9cbb1 | 197 | |
982d9a9c | 198 | rcu_read_unlock(); |
9fb9cbb1 | 199 | |
f8ba1aff | 200 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
201 | /* Expectations will have been removed in clean_from_lists, |
202 | * except TFTP can create an expectation on the first packet, | |
203 | * before connection is in the list, so we need to clean here, | |
204 | * too. */ | |
c1d10adb | 205 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
206 | |
207 | /* We overload first tuple to link into unconfirmed list. */ | |
208 | if (!nf_ct_is_confirmed(ct)) { | |
ea781f19 ED |
209 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
210 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 YK |
211 | } |
212 | ||
0d55af87 | 213 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 214 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
215 | |
216 | if (ct->master) | |
217 | nf_ct_put(ct->master); | |
218 | ||
0d53778e | 219 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
220 | nf_conntrack_free(ct); |
221 | } | |
222 | ||
223 | static void death_by_timeout(unsigned long ul_conntrack) | |
224 | { | |
225 | struct nf_conn *ct = (void *)ul_conntrack; | |
0d55af87 | 226 | struct net *net = nf_ct_net(ct); |
5397e97d | 227 | struct nf_conn_help *help = nfct_help(ct); |
3c158f7f | 228 | struct nf_conntrack_helper *helper; |
5397e97d | 229 | |
3c158f7f PM |
230 | if (help) { |
231 | rcu_read_lock(); | |
232 | helper = rcu_dereference(help->helper); | |
233 | if (helper && helper->destroy) | |
234 | helper->destroy(ct); | |
235 | rcu_read_unlock(); | |
236 | } | |
9fb9cbb1 | 237 | |
f8ba1aff | 238 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
239 | /* Inside lock so preempt is disabled on module removal path. |
240 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 241 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 242 | clean_from_lists(ct); |
f8ba1aff | 243 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
244 | nf_ct_put(ct); |
245 | } | |
246 | ||
ea781f19 ED |
247 | /* |
248 | * Warning : | |
249 | * - Caller must take a reference on returned object | |
250 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
251 | * OR | |
252 | * - Caller must lock nf_conntrack_lock before calling this function | |
253 | */ | |
c1d10adb | 254 | struct nf_conntrack_tuple_hash * |
400dad39 | 255 | __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 YK |
256 | { |
257 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 258 | struct hlist_nulls_node *n; |
9fb9cbb1 YK |
259 | unsigned int hash = hash_conntrack(tuple); |
260 | ||
4e29e9ec PM |
261 | /* Disable BHs the entire time since we normally need to disable them |
262 | * at least once for the stats anyway. | |
263 | */ | |
264 | local_bh_disable(); | |
ea781f19 ED |
265 | begin: |
266 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { | |
ba419aff | 267 | if (nf_ct_tuple_equal(tuple, &h->tuple)) { |
0d55af87 | 268 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 269 | local_bh_enable(); |
9fb9cbb1 YK |
270 | return h; |
271 | } | |
0d55af87 | 272 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 273 | } |
ea781f19 ED |
274 | /* |
275 | * if the nulls value we got at the end of this lookup is | |
276 | * not the expected one, we must restart lookup. | |
277 | * We probably met an item that was moved to another chain. | |
278 | */ | |
279 | if (get_nulls_value(n) != hash) | |
280 | goto begin; | |
4e29e9ec | 281 | local_bh_enable(); |
9fb9cbb1 YK |
282 | |
283 | return NULL; | |
284 | } | |
13b18339 | 285 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
286 | |
287 | /* Find a connection corresponding to a tuple. */ | |
288 | struct nf_conntrack_tuple_hash * | |
400dad39 | 289 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 YK |
290 | { |
291 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 292 | struct nf_conn *ct; |
9fb9cbb1 | 293 | |
76507f69 | 294 | rcu_read_lock(); |
ea781f19 | 295 | begin: |
400dad39 | 296 | h = __nf_conntrack_find(net, tuple); |
76507f69 PM |
297 | if (h) { |
298 | ct = nf_ct_tuplehash_to_ctrack(h); | |
299 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) | |
300 | h = NULL; | |
ea781f19 ED |
301 | else { |
302 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) { | |
303 | nf_ct_put(ct); | |
304 | goto begin; | |
305 | } | |
306 | } | |
76507f69 PM |
307 | } |
308 | rcu_read_unlock(); | |
9fb9cbb1 YK |
309 | |
310 | return h; | |
311 | } | |
13b18339 | 312 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 313 | |
c1d10adb PNA |
314 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
315 | unsigned int hash, | |
601e68e1 | 316 | unsigned int repl_hash) |
c1d10adb | 317 | { |
400dad39 AD |
318 | struct net *net = nf_ct_net(ct); |
319 | ||
ea781f19 | 320 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 321 | &net->ct.hash[hash]); |
ea781f19 | 322 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 323 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
324 | } |
325 | ||
326 | void nf_conntrack_hash_insert(struct nf_conn *ct) | |
327 | { | |
328 | unsigned int hash, repl_hash; | |
329 | ||
330 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
331 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
332 | ||
c1d10adb | 333 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
c1d10adb | 334 | } |
13b18339 | 335 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
c1d10adb | 336 | |
9fb9cbb1 YK |
337 | /* Confirm a connection given skb; places it in hash table */ |
338 | int | |
3db05fea | 339 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
340 | { |
341 | unsigned int hash, repl_hash; | |
df0933dc | 342 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 343 | struct nf_conn *ct; |
df0933dc | 344 | struct nf_conn_help *help; |
ea781f19 | 345 | struct hlist_nulls_node *n; |
9fb9cbb1 | 346 | enum ip_conntrack_info ctinfo; |
400dad39 | 347 | struct net *net; |
9fb9cbb1 | 348 | |
3db05fea | 349 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 350 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
351 | |
352 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
353 | ICMP/TCP RST packets in other direction. Actual packet | |
354 | which created connection will be IP_CT_NEW or for an | |
355 | expected connection, IP_CT_RELATED. */ | |
356 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
357 | return NF_ACCEPT; | |
358 | ||
359 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
360 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
361 | ||
362 | /* We're not in hash table, and we refuse to set up related | |
363 | connections for unconfirmed conns. But packet copies and | |
364 | REJECT will give spurious warnings here. */ | |
365 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
366 | ||
367 | /* No external references means noone else could have | |
368 | confirmed us. */ | |
369 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 370 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 371 | |
f8ba1aff | 372 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
373 | |
374 | /* See if there's one in the list already, including reverse: | |
375 | NAT could have grabbed it without realizing, since we're | |
376 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 377 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc PM |
378 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
379 | &h->tuple)) | |
380 | goto out; | |
ea781f19 | 381 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc PM |
382 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
383 | &h->tuple)) | |
384 | goto out; | |
9fb9cbb1 | 385 | |
df0933dc | 386 | /* Remove from unconfirmed list */ |
ea781f19 | 387 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc PM |
388 | |
389 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
390 | /* Timer relative to confirmation time, not original | |
391 | setting time, otherwise we'd get timer wrap in | |
392 | weird delay cases. */ | |
393 | ct->timeout.expires += jiffies; | |
394 | add_timer(&ct->timeout); | |
395 | atomic_inc(&ct->ct_general.use); | |
396 | set_bit(IPS_CONFIRMED_BIT, &ct->status); | |
0d55af87 | 397 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 398 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
399 | help = nfct_help(ct); |
400 | if (help && help->helper) | |
a71996fc | 401 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 402 | |
df0933dc | 403 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 404 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 405 | return NF_ACCEPT; |
9fb9cbb1 | 406 | |
df0933dc | 407 | out: |
0d55af87 | 408 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 409 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
410 | return NF_DROP; |
411 | } | |
13b18339 | 412 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
413 | |
414 | /* Returns true if a connection correspondings to the tuple (required | |
415 | for NAT). */ | |
416 | int | |
417 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
418 | const struct nf_conn *ignored_conntrack) | |
419 | { | |
400dad39 | 420 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 421 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 422 | struct hlist_nulls_node *n; |
ba419aff | 423 | unsigned int hash = hash_conntrack(tuple); |
9fb9cbb1 | 424 | |
4e29e9ec PM |
425 | /* Disable BHs the entire time since we need to disable them at |
426 | * least once for the stats anyway. | |
427 | */ | |
428 | rcu_read_lock_bh(); | |
ea781f19 | 429 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
ba419aff PM |
430 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
431 | nf_ct_tuple_equal(tuple, &h->tuple)) { | |
0d55af87 | 432 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 433 | rcu_read_unlock_bh(); |
ba419aff PM |
434 | return 1; |
435 | } | |
0d55af87 | 436 | NF_CT_STAT_INC(net, searched); |
ba419aff | 437 | } |
4e29e9ec | 438 | rcu_read_unlock_bh(); |
9fb9cbb1 | 439 | |
ba419aff | 440 | return 0; |
9fb9cbb1 | 441 | } |
13b18339 | 442 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 443 | |
7ae7730f PM |
444 | #define NF_CT_EVICTION_RANGE 8 |
445 | ||
9fb9cbb1 YK |
446 | /* There's a small race here where we may free a just-assured |
447 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 448 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 449 | { |
f205c5e0 | 450 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 451 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 452 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 453 | struct hlist_nulls_node *n; |
7ae7730f | 454 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
455 | int dropped = 0; |
456 | ||
76507f69 | 457 | rcu_read_lock(); |
7ae7730f | 458 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
459 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
460 | hnnode) { | |
7ae7730f PM |
461 | tmp = nf_ct_tuplehash_to_ctrack(h); |
462 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
463 | ct = tmp; | |
464 | cnt++; | |
465 | } | |
76507f69 PM |
466 | |
467 | if (ct && unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) | |
468 | ct = NULL; | |
7ae7730f PM |
469 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
470 | break; | |
471 | hash = (hash + 1) % nf_conntrack_htable_size; | |
9fb9cbb1 | 472 | } |
76507f69 | 473 | rcu_read_unlock(); |
9fb9cbb1 YK |
474 | |
475 | if (!ct) | |
476 | return dropped; | |
477 | ||
478 | if (del_timer(&ct->timeout)) { | |
479 | death_by_timeout((unsigned long)ct); | |
480 | dropped = 1; | |
0d55af87 | 481 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
9fb9cbb1 YK |
482 | } |
483 | nf_ct_put(ct); | |
484 | return dropped; | |
485 | } | |
486 | ||
5a1fb391 AD |
487 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
488 | const struct nf_conntrack_tuple *orig, | |
b891c5a8 PNA |
489 | const struct nf_conntrack_tuple *repl, |
490 | gfp_t gfp) | |
9fb9cbb1 | 491 | { |
cd7fcbf1 | 492 | struct nf_conn *ct; |
9fb9cbb1 | 493 | |
dc808fe2 | 494 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
af07d241 HPP |
495 | get_random_bytes(&nf_conntrack_hash_rnd, |
496 | sizeof(nf_conntrack_hash_rnd)); | |
9fb9cbb1 YK |
497 | nf_conntrack_hash_rnd_initted = 1; |
498 | } | |
499 | ||
5251e2d2 | 500 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 501 | atomic_inc(&net->ct.count); |
5251e2d2 | 502 | |
76eb9460 | 503 | if (nf_conntrack_max && |
49ac8713 | 504 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
9fb9cbb1 | 505 | unsigned int hash = hash_conntrack(orig); |
400dad39 | 506 | if (!early_drop(net, hash)) { |
49ac8713 | 507 | atomic_dec(&net->ct.count); |
9fb9cbb1 YK |
508 | if (net_ratelimit()) |
509 | printk(KERN_WARNING | |
510 | "nf_conntrack: table full, dropping" | |
511 | " packet.\n"); | |
512 | return ERR_PTR(-ENOMEM); | |
513 | } | |
514 | } | |
515 | ||
b891c5a8 | 516 | ct = kmem_cache_zalloc(nf_conntrack_cachep, gfp); |
c88130bc | 517 | if (ct == NULL) { |
0d53778e | 518 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
49ac8713 | 519 | atomic_dec(&net->ct.count); |
dacd2a1a | 520 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 YK |
521 | } |
522 | ||
440f0d58 | 523 | spin_lock_init(&ct->lock); |
c88130bc PM |
524 | atomic_set(&ct->ct_general.use, 1); |
525 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; | |
526 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; | |
9fb9cbb1 | 527 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 528 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
5a1fb391 AD |
529 | #ifdef CONFIG_NET_NS |
530 | ct->ct_net = net; | |
531 | #endif | |
9fb9cbb1 | 532 | |
c88130bc | 533 | return ct; |
9fb9cbb1 | 534 | } |
13b18339 | 535 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 536 | |
c88130bc | 537 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 538 | { |
1d45209d ED |
539 | struct net *net = nf_ct_net(ct); |
540 | ||
ceeff754 | 541 | nf_ct_ext_destroy(ct); |
1d45209d | 542 | atomic_dec(&net->ct.count); |
ea781f19 ED |
543 | nf_ct_ext_free(ct); |
544 | kmem_cache_free(nf_conntrack_cachep, ct); | |
76507f69 | 545 | } |
13b18339 | 546 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 YK |
547 | |
548 | /* Allocate a new conntrack: we return -ENOMEM if classification | |
549 | failed due to stress. Otherwise it really is unclassifiable. */ | |
550 | static struct nf_conntrack_tuple_hash * | |
5a1fb391 AD |
551 | init_conntrack(struct net *net, |
552 | const struct nf_conntrack_tuple *tuple, | |
9fb9cbb1 | 553 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 554 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
555 | struct sk_buff *skb, |
556 | unsigned int dataoff) | |
557 | { | |
c88130bc | 558 | struct nf_conn *ct; |
3c158f7f | 559 | struct nf_conn_help *help; |
9fb9cbb1 YK |
560 | struct nf_conntrack_tuple repl_tuple; |
561 | struct nf_conntrack_expect *exp; | |
562 | ||
605dcad6 | 563 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 564 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
565 | return NULL; |
566 | } | |
567 | ||
5a1fb391 | 568 | ct = nf_conntrack_alloc(net, tuple, &repl_tuple, GFP_ATOMIC); |
cd7fcbf1 | 569 | if (IS_ERR(ct)) { |
0d53778e | 570 | pr_debug("Can't allocate conntrack.\n"); |
c88130bc | 571 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 YK |
572 | } |
573 | ||
c88130bc PM |
574 | if (!l4proto->new(ct, skb, dataoff)) { |
575 | nf_conntrack_free(ct); | |
0d53778e | 576 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
577 | return NULL; |
578 | } | |
579 | ||
58401572 | 580 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a0891aa6 | 581 | nf_ct_ecache_ext_add(ct, GFP_ATOMIC); |
58401572 | 582 | |
f8ba1aff | 583 | spin_lock_bh(&nf_conntrack_lock); |
9b03f38d | 584 | exp = nf_ct_find_expectation(net, tuple); |
9fb9cbb1 | 585 | if (exp) { |
0d53778e | 586 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 587 | ct, exp); |
9fb9cbb1 | 588 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
589 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
590 | ct->master = exp->master; | |
ceceae1b | 591 | if (exp->helper) { |
c88130bc | 592 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ceceae1b YK |
593 | if (help) |
594 | rcu_assign_pointer(help->helper, exp->helper); | |
ceceae1b YK |
595 | } |
596 | ||
9fb9cbb1 | 597 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 598 | ct->mark = exp->master->mark; |
7c9728c3 JM |
599 | #endif |
600 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 601 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 602 | #endif |
c88130bc | 603 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 604 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 605 | } else { |
226c0c0e | 606 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
0d55af87 | 607 | NF_CT_STAT_INC(net, new); |
22e7410b | 608 | } |
9fb9cbb1 YK |
609 | |
610 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 611 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 612 | &net->ct.unconfirmed); |
9fb9cbb1 | 613 | |
f8ba1aff | 614 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
615 | |
616 | if (exp) { | |
617 | if (exp->expectfn) | |
c88130bc | 618 | exp->expectfn(ct, exp); |
6823645d | 619 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
620 | } |
621 | ||
c88130bc | 622 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
623 | } |
624 | ||
625 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
626 | static inline struct nf_conn * | |
a702a65f AD |
627 | resolve_normal_ct(struct net *net, |
628 | struct sk_buff *skb, | |
9fb9cbb1 YK |
629 | unsigned int dataoff, |
630 | u_int16_t l3num, | |
631 | u_int8_t protonum, | |
632 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 633 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
634 | int *set_reply, |
635 | enum ip_conntrack_info *ctinfo) | |
636 | { | |
637 | struct nf_conntrack_tuple tuple; | |
638 | struct nf_conntrack_tuple_hash *h; | |
639 | struct nf_conn *ct; | |
640 | ||
bbe735e4 | 641 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 642 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 643 | l4proto)) { |
0d53778e | 644 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
645 | return NULL; |
646 | } | |
647 | ||
648 | /* look for tuple match */ | |
a702a65f | 649 | h = nf_conntrack_find_get(net, &tuple); |
9fb9cbb1 | 650 | if (!h) { |
a702a65f | 651 | h = init_conntrack(net, &tuple, l3proto, l4proto, skb, dataoff); |
9fb9cbb1 YK |
652 | if (!h) |
653 | return NULL; | |
654 | if (IS_ERR(h)) | |
655 | return (void *)h; | |
656 | } | |
657 | ct = nf_ct_tuplehash_to_ctrack(h); | |
658 | ||
659 | /* It exists; we have (non-exclusive) reference. */ | |
660 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
661 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; | |
662 | /* Please set reply bit if this packet OK */ | |
663 | *set_reply = 1; | |
664 | } else { | |
665 | /* Once we've had two way comms, always ESTABLISHED. */ | |
666 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 667 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
668 | *ctinfo = IP_CT_ESTABLISHED; |
669 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
670 | pr_debug("nf_conntrack_in: related packet for %p\n", |
671 | ct); | |
9fb9cbb1 YK |
672 | *ctinfo = IP_CT_RELATED; |
673 | } else { | |
0d53778e | 674 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
675 | *ctinfo = IP_CT_NEW; |
676 | } | |
677 | *set_reply = 0; | |
678 | } | |
679 | skb->nfct = &ct->ct_general; | |
680 | skb->nfctinfo = *ctinfo; | |
681 | return ct; | |
682 | } | |
683 | ||
684 | unsigned int | |
a702a65f AD |
685 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
686 | struct sk_buff *skb) | |
9fb9cbb1 YK |
687 | { |
688 | struct nf_conn *ct; | |
689 | enum ip_conntrack_info ctinfo; | |
690 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 691 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 YK |
692 | unsigned int dataoff; |
693 | u_int8_t protonum; | |
694 | int set_reply = 0; | |
695 | int ret; | |
696 | ||
697 | /* Previously seen (loopback or untracked)? Ignore. */ | |
3db05fea | 698 | if (skb->nfct) { |
0d55af87 | 699 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
9fb9cbb1 YK |
700 | return NF_ACCEPT; |
701 | } | |
702 | ||
923f4902 | 703 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 704 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 705 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
706 | &dataoff, &protonum); |
707 | if (ret <= 0) { | |
0d53778e | 708 | pr_debug("not prepared to track yet or error occured\n"); |
0d55af87 AD |
709 | NF_CT_STAT_INC_ATOMIC(net, error); |
710 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
9fb9cbb1 YK |
711 | return -ret; |
712 | } | |
713 | ||
76108cea | 714 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
715 | |
716 | /* It may be an special packet, error, unclean... | |
717 | * inverse of the return code tells to the netfilter | |
718 | * core what to do with the packet. */ | |
74c51a14 AD |
719 | if (l4proto->error != NULL) { |
720 | ret = l4proto->error(net, skb, dataoff, &ctinfo, pf, hooknum); | |
721 | if (ret <= 0) { | |
0d55af87 AD |
722 | NF_CT_STAT_INC_ATOMIC(net, error); |
723 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
74c51a14 AD |
724 | return -ret; |
725 | } | |
9fb9cbb1 YK |
726 | } |
727 | ||
a702a65f AD |
728 | ct = resolve_normal_ct(net, skb, dataoff, pf, protonum, |
729 | l3proto, l4proto, &set_reply, &ctinfo); | |
9fb9cbb1 YK |
730 | if (!ct) { |
731 | /* Not valid part of a connection */ | |
0d55af87 | 732 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
9fb9cbb1 YK |
733 | return NF_ACCEPT; |
734 | } | |
735 | ||
736 | if (IS_ERR(ct)) { | |
737 | /* Too stressed to deal. */ | |
0d55af87 | 738 | NF_CT_STAT_INC_ATOMIC(net, drop); |
9fb9cbb1 YK |
739 | return NF_DROP; |
740 | } | |
741 | ||
3db05fea | 742 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 743 | |
3db05fea | 744 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
ec8d5409 | 745 | if (ret <= 0) { |
9fb9cbb1 YK |
746 | /* Invalid: inverse of the return code tells |
747 | * the netfilter core what to do */ | |
0d53778e | 748 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
749 | nf_conntrack_put(skb->nfct); |
750 | skb->nfct = NULL; | |
0d55af87 | 751 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
752 | if (ret == -NF_DROP) |
753 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
9fb9cbb1 YK |
754 | return -ret; |
755 | } | |
756 | ||
757 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
a71996fc | 758 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 YK |
759 | |
760 | return ret; | |
761 | } | |
13b18339 | 762 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 763 | |
5f2b4c90 JE |
764 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
765 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 766 | { |
5f2b4c90 | 767 | bool ret; |
923f4902 PM |
768 | |
769 | rcu_read_lock(); | |
770 | ret = nf_ct_invert_tuple(inverse, orig, | |
771 | __nf_ct_l3proto_find(orig->src.l3num), | |
772 | __nf_ct_l4proto_find(orig->src.l3num, | |
773 | orig->dst.protonum)); | |
774 | rcu_read_unlock(); | |
775 | return ret; | |
9fb9cbb1 | 776 | } |
13b18339 | 777 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 778 | |
5b1158e9 JK |
779 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
780 | implicitly racy: see __nf_conntrack_confirm */ | |
781 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
782 | const struct nf_conntrack_tuple *newreply) | |
783 | { | |
784 | struct nf_conn_help *help = nfct_help(ct); | |
785 | ||
5b1158e9 JK |
786 | /* Should be unconfirmed, so not in hash table yet */ |
787 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
788 | ||
0d53778e | 789 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 790 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
791 | |
792 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 793 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 794 | return; |
ceceae1b | 795 | |
c52fbb41 | 796 | rcu_read_lock(); |
226c0c0e | 797 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
c52fbb41 | 798 | rcu_read_unlock(); |
5b1158e9 | 799 | } |
13b18339 | 800 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 801 | |
9fb9cbb1 YK |
802 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
803 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
804 | enum ip_conntrack_info ctinfo, | |
805 | const struct sk_buff *skb, | |
806 | unsigned long extra_jiffies, | |
807 | int do_acct) | |
808 | { | |
9fb9cbb1 YK |
809 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
810 | NF_CT_ASSERT(skb); | |
811 | ||
997ae831 | 812 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
813 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
814 | goto acct; | |
997ae831 | 815 | |
9fb9cbb1 YK |
816 | /* If not in hash table, timer will not be active yet */ |
817 | if (!nf_ct_is_confirmed(ct)) { | |
818 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 819 | } else { |
be00c8e4 MJ |
820 | unsigned long newtime = jiffies + extra_jiffies; |
821 | ||
822 | /* Only update the timeout if the new timeout is at least | |
823 | HZ jiffies from the old timeout. Need del_timer for race | |
824 | avoidance (may already be dying). */ | |
65cb9fda PM |
825 | if (newtime - ct->timeout.expires >= HZ) |
826 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
827 | } |
828 | ||
47d95045 | 829 | acct: |
9fb9cbb1 | 830 | if (do_acct) { |
58401572 | 831 | struct nf_conn_counter *acct; |
3ffd5eeb | 832 | |
58401572 KPO |
833 | acct = nf_conn_acct_find(ct); |
834 | if (acct) { | |
65cb9fda | 835 | spin_lock_bh(&ct->lock); |
58401572 KPO |
836 | acct[CTINFO2DIR(ctinfo)].packets++; |
837 | acct[CTINFO2DIR(ctinfo)].bytes += | |
838 | skb->len - skb_network_offset(skb); | |
65cb9fda | 839 | spin_unlock_bh(&ct->lock); |
58401572 | 840 | } |
9fb9cbb1 | 841 | } |
9fb9cbb1 | 842 | } |
13b18339 | 843 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 844 | |
4c889498 DM |
845 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
846 | enum ip_conntrack_info ctinfo, | |
847 | const struct sk_buff *skb, | |
848 | int do_acct) | |
51091764 | 849 | { |
718d4ad9 | 850 | if (do_acct) { |
58401572 KPO |
851 | struct nf_conn_counter *acct; |
852 | ||
58401572 KPO |
853 | acct = nf_conn_acct_find(ct); |
854 | if (acct) { | |
65cb9fda | 855 | spin_lock_bh(&ct->lock); |
58401572 KPO |
856 | acct[CTINFO2DIR(ctinfo)].packets++; |
857 | acct[CTINFO2DIR(ctinfo)].bytes += | |
858 | skb->len - skb_network_offset(skb); | |
65cb9fda | 859 | spin_unlock_bh(&ct->lock); |
58401572 | 860 | } |
718d4ad9 | 861 | } |
58401572 | 862 | |
4c889498 | 863 | if (del_timer(&ct->timeout)) { |
51091764 | 864 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
865 | return true; |
866 | } | |
867 | return false; | |
51091764 | 868 | } |
718d4ad9 | 869 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 870 | |
e281db5c | 871 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
872 | |
873 | #include <linux/netfilter/nfnetlink.h> | |
874 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
875 | #include <linux/mutex.h> |
876 | ||
c1d10adb PNA |
877 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
878 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
879 | * or depend on ctnetlink */ | |
fdf70832 | 880 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
881 | const struct nf_conntrack_tuple *tuple) |
882 | { | |
77236b6e PM |
883 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
884 | NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); | |
c1d10adb PNA |
885 | return 0; |
886 | ||
df6fb868 | 887 | nla_put_failure: |
c1d10adb PNA |
888 | return -1; |
889 | } | |
fdf70832 | 890 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 891 | |
f73e924c PM |
892 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
893 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
894 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 895 | }; |
f73e924c | 896 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 897 | |
fdf70832 | 898 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
899 | struct nf_conntrack_tuple *t) |
900 | { | |
df6fb868 | 901 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
902 | return -EINVAL; |
903 | ||
77236b6e PM |
904 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
905 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
906 | |
907 | return 0; | |
908 | } | |
fdf70832 | 909 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
910 | |
911 | int nf_ct_port_nlattr_tuple_size(void) | |
912 | { | |
913 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
916 | #endif |
917 | ||
9fb9cbb1 | 918 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc | 919 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb1 YK |
920 | { |
921 | struct nf_conn *ct; | |
922 | enum ip_conntrack_info ctinfo; | |
923 | ||
924 | /* This ICMP is in reverse direction to the packet which caused it */ | |
925 | ct = nf_ct_get(skb, &ctinfo); | |
926 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
927 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; | |
928 | else | |
929 | ctinfo = IP_CT_RELATED; | |
930 | ||
931 | /* Attach to new skbuff, and increment count */ | |
932 | nskb->nfct = &ct->ct_general; | |
933 | nskb->nfctinfo = ctinfo; | |
934 | nf_conntrack_get(nskb->nfct); | |
935 | } | |
936 | ||
9fb9cbb1 | 937 | /* Bring out ya dead! */ |
df0933dc | 938 | static struct nf_conn * |
400dad39 | 939 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
940 | void *data, unsigned int *bucket) |
941 | { | |
df0933dc PM |
942 | struct nf_conntrack_tuple_hash *h; |
943 | struct nf_conn *ct; | |
ea781f19 | 944 | struct hlist_nulls_node *n; |
9fb9cbb1 | 945 | |
f8ba1aff | 946 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 947 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
ea781f19 | 948 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
df0933dc PM |
949 | ct = nf_ct_tuplehash_to_ctrack(h); |
950 | if (iter(ct, data)) | |
951 | goto found; | |
952 | } | |
601e68e1 | 953 | } |
ea781f19 | 954 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
955 | ct = nf_ct_tuplehash_to_ctrack(h); |
956 | if (iter(ct, data)) | |
ec68e97d | 957 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 958 | } |
f8ba1aff | 959 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
960 | return NULL; |
961 | found: | |
c073e3fa | 962 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 963 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 964 | return ct; |
9fb9cbb1 YK |
965 | } |
966 | ||
400dad39 AD |
967 | void nf_ct_iterate_cleanup(struct net *net, |
968 | int (*iter)(struct nf_conn *i, void *data), | |
969 | void *data) | |
9fb9cbb1 | 970 | { |
df0933dc | 971 | struct nf_conn *ct; |
9fb9cbb1 YK |
972 | unsigned int bucket = 0; |
973 | ||
400dad39 | 974 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
975 | /* Time to push up daises... */ |
976 | if (del_timer(&ct->timeout)) | |
977 | death_by_timeout((unsigned long)ct); | |
978 | /* ... else the timer will get him soon. */ | |
979 | ||
980 | nf_ct_put(ct); | |
981 | } | |
982 | } | |
13b18339 | 983 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 984 | |
19abb7b0 PNA |
985 | struct __nf_ct_flush_report { |
986 | u32 pid; | |
987 | int report; | |
988 | }; | |
989 | ||
274d383b | 990 | static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb1 | 991 | { |
19abb7b0 PNA |
992 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
993 | ||
994 | /* get_next_corpse sets the dying bit for us */ | |
995 | nf_conntrack_event_report(IPCT_DESTROY, | |
996 | i, | |
997 | fr->pid, | |
998 | fr->report); | |
9fb9cbb1 YK |
999 | return 1; |
1000 | } | |
1001 | ||
274d383b PNA |
1002 | static int kill_all(struct nf_conn *i, void *data) |
1003 | { | |
1004 | return 1; | |
1005 | } | |
1006 | ||
ea781f19 | 1007 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
9fb9cbb1 YK |
1008 | { |
1009 | if (vmalloced) | |
1010 | vfree(hash); | |
1011 | else | |
601e68e1 | 1012 | free_pages((unsigned long)hash, |
f205c5e0 | 1013 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1014 | } |
ac565e5f | 1015 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1016 | |
274d383b | 1017 | void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
c1d10adb | 1018 | { |
19abb7b0 PNA |
1019 | struct __nf_ct_flush_report fr = { |
1020 | .pid = pid, | |
1021 | .report = report, | |
1022 | }; | |
274d383b | 1023 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb | 1024 | } |
274d383b | 1025 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1026 | |
08f6547d | 1027 | static void nf_conntrack_cleanup_init_net(void) |
9fb9cbb1 | 1028 | { |
08f6547d AD |
1029 | nf_conntrack_helper_fini(); |
1030 | nf_conntrack_proto_fini(); | |
1031 | kmem_cache_destroy(nf_conntrack_cachep); | |
1032 | } | |
9fb9cbb1 | 1033 | |
08f6547d AD |
1034 | static void nf_conntrack_cleanup_net(struct net *net) |
1035 | { | |
9fb9cbb1 | 1036 | i_see_dead_people: |
274d383b | 1037 | nf_ct_iterate_cleanup(net, kill_all, NULL); |
49ac8713 | 1038 | if (atomic_read(&net->ct.count) != 0) { |
9fb9cbb1 YK |
1039 | schedule(); |
1040 | goto i_see_dead_people; | |
1041 | } | |
6636568c PM |
1042 | /* wait until all references to nf_conntrack_untracked are dropped */ |
1043 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) | |
1044 | schedule(); | |
9fb9cbb1 | 1045 | |
400dad39 | 1046 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1047 | nf_conntrack_htable_size); |
a0891aa6 | 1048 | nf_conntrack_ecache_fini(net); |
d716a4df | 1049 | nf_conntrack_acct_fini(net); |
9b03f38d | 1050 | nf_conntrack_expect_fini(net); |
0d55af87 | 1051 | free_percpu(net->ct.stat); |
08f6547d AD |
1052 | } |
1053 | ||
1054 | /* Mishearing the voices in his head, our hero wonders how he's | |
1055 | supposed to kill the mall. */ | |
1056 | void nf_conntrack_cleanup(struct net *net) | |
1057 | { | |
1058 | if (net_eq(net, &init_net)) | |
1059 | rcu_assign_pointer(ip_ct_attach, NULL); | |
1060 | ||
1061 | /* This makes sure all current packets have passed through | |
1062 | netfilter framework. Roll on, two-stage module | |
1063 | delete... */ | |
1064 | synchronize_net(); | |
1065 | ||
1066 | nf_conntrack_cleanup_net(net); | |
1067 | ||
1068 | if (net_eq(net, &init_net)) { | |
1069 | rcu_assign_pointer(nf_ct_destroy, NULL); | |
1070 | nf_conntrack_cleanup_init_net(); | |
1071 | } | |
9fb9cbb1 YK |
1072 | } |
1073 | ||
ea781f19 | 1074 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
9fb9cbb1 | 1075 | { |
ea781f19 ED |
1076 | struct hlist_nulls_head *hash; |
1077 | unsigned int nr_slots, i; | |
1078 | size_t sz; | |
9fb9cbb1 | 1079 | |
601e68e1 | 1080 | *vmalloced = 0; |
8e5105a0 | 1081 | |
ea781f19 ED |
1082 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1083 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1084 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1085 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1086 | get_order(sz)); | |
601e68e1 | 1087 | if (!hash) { |
9fb9cbb1 YK |
1088 | *vmalloced = 1; |
1089 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); | |
ea781f19 | 1090 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
9fb9cbb1 YK |
1091 | } |
1092 | ||
ea781f19 ED |
1093 | if (hash && nulls) |
1094 | for (i = 0; i < nr_slots; i++) | |
1095 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1096 | |
1097 | return hash; | |
1098 | } | |
ac565e5f | 1099 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1100 | |
fae718dd | 1101 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1102 | { |
96eb24d7 SH |
1103 | int i, bucket, vmalloced, old_vmalloced; |
1104 | unsigned int hashsize, old_size; | |
9fb9cbb1 | 1105 | int rnd; |
ea781f19 | 1106 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 YK |
1107 | struct nf_conntrack_tuple_hash *h; |
1108 | ||
1109 | /* On boot, we can set this without any fancy locking. */ | |
1110 | if (!nf_conntrack_htable_size) | |
1111 | return param_set_uint(val, kp); | |
1112 | ||
96eb24d7 | 1113 | hashsize = simple_strtoul(val, NULL, 0); |
9fb9cbb1 YK |
1114 | if (!hashsize) |
1115 | return -EINVAL; | |
1116 | ||
ea781f19 | 1117 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
9fb9cbb1 YK |
1118 | if (!hash) |
1119 | return -ENOMEM; | |
1120 | ||
1121 | /* We have to rehahs for the new table anyway, so we also can | |
1122 | * use a newrandom seed */ | |
af07d241 | 1123 | get_random_bytes(&rnd, sizeof(rnd)); |
9fb9cbb1 | 1124 | |
76507f69 PM |
1125 | /* Lookups in the old hash might happen in parallel, which means we |
1126 | * might get false negatives during connection lookup. New connections | |
1127 | * created because of a false negative won't make it into the hash | |
1128 | * though since that required taking the lock. | |
1129 | */ | |
f8ba1aff | 1130 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1131 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
1132 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1133 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1134 | struct nf_conntrack_tuple_hash, hnnode); | |
1135 | hlist_nulls_del_rcu(&h->hnnode); | |
9fb9cbb1 | 1136 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
ea781f19 | 1137 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1138 | } |
1139 | } | |
1140 | old_size = nf_conntrack_htable_size; | |
400dad39 AD |
1141 | old_vmalloced = init_net.ct.hash_vmalloc; |
1142 | old_hash = init_net.ct.hash; | |
9fb9cbb1 YK |
1143 | |
1144 | nf_conntrack_htable_size = hashsize; | |
400dad39 AD |
1145 | init_net.ct.hash_vmalloc = vmalloced; |
1146 | init_net.ct.hash = hash; | |
9fb9cbb1 | 1147 | nf_conntrack_hash_rnd = rnd; |
f8ba1aff | 1148 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1149 | |
ac565e5f | 1150 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
9fb9cbb1 YK |
1151 | return 0; |
1152 | } | |
fae718dd | 1153 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1154 | |
fae718dd | 1155 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1156 | &nf_conntrack_htable_size, 0600); |
1157 | ||
08f6547d | 1158 | static int nf_conntrack_init_init_net(void) |
9fb9cbb1 | 1159 | { |
f205c5e0 | 1160 | int max_factor = 8; |
9fb9cbb1 YK |
1161 | int ret; |
1162 | ||
1163 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1164 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1165 | if (!nf_conntrack_htable_size) { |
1166 | nf_conntrack_htable_size | |
1167 | = (((num_physpages << PAGE_SHIFT) / 16384) | |
f205c5e0 | 1168 | / sizeof(struct hlist_head)); |
9fb9cbb1 | 1169 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1170 | nf_conntrack_htable_size = 16384; |
1171 | if (nf_conntrack_htable_size < 32) | |
1172 | nf_conntrack_htable_size = 32; | |
1173 | ||
1174 | /* Use a max. factor of four by default to get the same max as | |
1175 | * with the old struct list_heads. When a table size is given | |
1176 | * we use the old value of 8 to avoid reducing the max. | |
1177 | * entries. */ | |
1178 | max_factor = 4; | |
9fb9cbb1 | 1179 | } |
f205c5e0 | 1180 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 PM |
1181 | |
1182 | printk("nf_conntrack version %s (%u buckets, %d max)\n", | |
1183 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, | |
1184 | nf_conntrack_max); | |
1185 | ||
dacd2a1a YK |
1186 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
1187 | sizeof(struct nf_conn), | |
ea781f19 | 1188 | 0, SLAB_DESTROY_BY_RCU, NULL); |
dacd2a1a | 1189 | if (!nf_conntrack_cachep) { |
9fb9cbb1 | 1190 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
08f6547d AD |
1191 | ret = -ENOMEM; |
1192 | goto err_cache; | |
9fb9cbb1 YK |
1193 | } |
1194 | ||
e9c1b084 PM |
1195 | ret = nf_conntrack_proto_init(); |
1196 | if (ret < 0) | |
08f6547d | 1197 | goto err_proto; |
933a41e7 | 1198 | |
ceceae1b YK |
1199 | ret = nf_conntrack_helper_init(); |
1200 | if (ret < 0) | |
08f6547d AD |
1201 | goto err_helper; |
1202 | ||
1203 | return 0; | |
1204 | ||
1205 | err_helper: | |
1206 | nf_conntrack_proto_fini(); | |
1207 | err_proto: | |
1208 | kmem_cache_destroy(nf_conntrack_cachep); | |
1209 | err_cache: | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | static int nf_conntrack_init_net(struct net *net) | |
1214 | { | |
1215 | int ret; | |
ceceae1b | 1216 | |
08f6547d | 1217 | atomic_set(&net->ct.count, 0); |
ea781f19 | 1218 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0); |
08f6547d AD |
1219 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1220 | if (!net->ct.stat) { | |
1221 | ret = -ENOMEM; | |
1222 | goto err_stat; | |
1223 | } | |
08f6547d | 1224 | net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
ea781f19 | 1225 | &net->ct.hash_vmalloc, 1); |
08f6547d AD |
1226 | if (!net->ct.hash) { |
1227 | ret = -ENOMEM; | |
1228 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1229 | goto err_hash; | |
1230 | } | |
1231 | ret = nf_conntrack_expect_init(net); | |
1232 | if (ret < 0) | |
1233 | goto err_expect; | |
d716a4df | 1234 | ret = nf_conntrack_acct_init(net); |
58401572 | 1235 | if (ret < 0) |
08f6547d | 1236 | goto err_acct; |
a0891aa6 PNA |
1237 | ret = nf_conntrack_ecache_init(net); |
1238 | if (ret < 0) | |
1239 | goto err_ecache; | |
7d3cdc6b | 1240 | |
9fb9cbb1 YK |
1241 | /* Set up fake conntrack: |
1242 | - to never be deleted, not in any hashes */ | |
5a1fb391 AD |
1243 | #ifdef CONFIG_NET_NS |
1244 | nf_conntrack_untracked.ct_net = &init_net; | |
1245 | #endif | |
9fb9cbb1 YK |
1246 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
1247 | /* - and look it like as a confirmed connection */ | |
1248 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); | |
1249 | ||
08f6547d | 1250 | return 0; |
9fb9cbb1 | 1251 | |
a0891aa6 PNA |
1252 | err_ecache: |
1253 | nf_conntrack_acct_fini(net); | |
08f6547d | 1254 | err_acct: |
9b03f38d | 1255 | nf_conntrack_expect_fini(net); |
08f6547d | 1256 | err_expect: |
400dad39 | 1257 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1258 | nf_conntrack_htable_size); |
6058fa6b | 1259 | err_hash: |
0d55af87 AD |
1260 | free_percpu(net->ct.stat); |
1261 | err_stat: | |
08f6547d AD |
1262 | return ret; |
1263 | } | |
1264 | ||
1265 | int nf_conntrack_init(struct net *net) | |
1266 | { | |
1267 | int ret; | |
1268 | ||
1269 | if (net_eq(net, &init_net)) { | |
1270 | ret = nf_conntrack_init_init_net(); | |
1271 | if (ret < 0) | |
1272 | goto out_init_net; | |
1273 | } | |
1274 | ret = nf_conntrack_init_net(net); | |
1275 | if (ret < 0) | |
1276 | goto out_net; | |
1277 | ||
1278 | if (net_eq(net, &init_net)) { | |
1279 | /* For use by REJECT target */ | |
1280 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); | |
1281 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); | |
1282 | } | |
1283 | return 0; | |
1284 | ||
1285 | out_net: | |
1286 | if (net_eq(net, &init_net)) | |
1287 | nf_conntrack_cleanup_init_net(); | |
1288 | out_init_net: | |
1289 | return ret; | |
9fb9cbb1 | 1290 | } |