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 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 | ||
9fb9cbb1 YK |
186 | /* To make sure we don't get any weird locking issues here: |
187 | * destroy_conntrack() MUST NOT be called with a write lock | |
188 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 189 | rcu_read_lock(); |
5e8fbe2a | 190 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
191 | if (l4proto && l4proto->destroy) |
192 | l4proto->destroy(ct); | |
9fb9cbb1 | 193 | |
982d9a9c | 194 | rcu_read_unlock(); |
9fb9cbb1 | 195 | |
f8ba1aff | 196 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
197 | /* Expectations will have been removed in clean_from_lists, |
198 | * except TFTP can create an expectation on the first packet, | |
199 | * before connection is in the list, so we need to clean here, | |
200 | * too. */ | |
c1d10adb | 201 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
202 | |
203 | /* We overload first tuple to link into unconfirmed list. */ | |
204 | if (!nf_ct_is_confirmed(ct)) { | |
ea781f19 ED |
205 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
206 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 YK |
207 | } |
208 | ||
0d55af87 | 209 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 210 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
211 | |
212 | if (ct->master) | |
213 | nf_ct_put(ct->master); | |
214 | ||
0d53778e | 215 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
216 | nf_conntrack_free(ct); |
217 | } | |
218 | ||
dd7669a9 | 219 | void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 220 | { |
0d55af87 | 221 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 | 222 | |
9858a3ae | 223 | nf_ct_helper_destroy(ct); |
f8ba1aff | 224 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
225 | /* Inside lock so preempt is disabled on module removal path. |
226 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 227 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 228 | clean_from_lists(ct); |
f8ba1aff | 229 | spin_unlock_bh(&nf_conntrack_lock); |
dd7669a9 PNA |
230 | } |
231 | EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); | |
232 | ||
233 | static void death_by_event(unsigned long ul_conntrack) | |
234 | { | |
235 | struct nf_conn *ct = (void *)ul_conntrack; | |
236 | struct net *net = nf_ct_net(ct); | |
237 | ||
238 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { | |
239 | /* bad luck, let's retry again */ | |
240 | ct->timeout.expires = jiffies + | |
241 | (random32() % net->ct.sysctl_events_retry_timeout); | |
242 | add_timer(&ct->timeout); | |
243 | return; | |
244 | } | |
245 | /* we've got the event delivered, now it's dying */ | |
246 | set_bit(IPS_DYING_BIT, &ct->status); | |
247 | spin_lock(&nf_conntrack_lock); | |
248 | hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
249 | spin_unlock(&nf_conntrack_lock); | |
250 | nf_ct_put(ct); | |
251 | } | |
252 | ||
253 | void nf_ct_insert_dying_list(struct nf_conn *ct) | |
254 | { | |
255 | struct net *net = nf_ct_net(ct); | |
256 | ||
257 | /* add this conntrack to the dying list */ | |
258 | spin_lock_bh(&nf_conntrack_lock); | |
259 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
260 | &net->ct.dying); | |
261 | spin_unlock_bh(&nf_conntrack_lock); | |
262 | /* set a new timer to retry event delivery */ | |
263 | setup_timer(&ct->timeout, death_by_event, (unsigned long)ct); | |
264 | ct->timeout.expires = jiffies + | |
265 | (random32() % net->ct.sysctl_events_retry_timeout); | |
266 | add_timer(&ct->timeout); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list); | |
269 | ||
270 | static void death_by_timeout(unsigned long ul_conntrack) | |
271 | { | |
272 | struct nf_conn *ct = (void *)ul_conntrack; | |
273 | ||
274 | if (!test_bit(IPS_DYING_BIT, &ct->status) && | |
275 | unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { | |
276 | /* destroy event was not delivered */ | |
277 | nf_ct_delete_from_lists(ct); | |
278 | nf_ct_insert_dying_list(ct); | |
279 | return; | |
280 | } | |
281 | set_bit(IPS_DYING_BIT, &ct->status); | |
282 | nf_ct_delete_from_lists(ct); | |
9fb9cbb1 YK |
283 | nf_ct_put(ct); |
284 | } | |
285 | ||
ea781f19 ED |
286 | /* |
287 | * Warning : | |
288 | * - Caller must take a reference on returned object | |
289 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
290 | * OR | |
291 | * - Caller must lock nf_conntrack_lock before calling this function | |
292 | */ | |
c1d10adb | 293 | struct nf_conntrack_tuple_hash * |
400dad39 | 294 | __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 YK |
295 | { |
296 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 297 | struct hlist_nulls_node *n; |
9fb9cbb1 YK |
298 | unsigned int hash = hash_conntrack(tuple); |
299 | ||
4e29e9ec PM |
300 | /* Disable BHs the entire time since we normally need to disable them |
301 | * at least once for the stats anyway. | |
302 | */ | |
303 | local_bh_disable(); | |
ea781f19 ED |
304 | begin: |
305 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { | |
ba419aff | 306 | if (nf_ct_tuple_equal(tuple, &h->tuple)) { |
0d55af87 | 307 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 308 | local_bh_enable(); |
9fb9cbb1 YK |
309 | return h; |
310 | } | |
0d55af87 | 311 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 312 | } |
ea781f19 ED |
313 | /* |
314 | * if the nulls value we got at the end of this lookup is | |
315 | * not the expected one, we must restart lookup. | |
316 | * We probably met an item that was moved to another chain. | |
317 | */ | |
318 | if (get_nulls_value(n) != hash) | |
319 | goto begin; | |
4e29e9ec | 320 | local_bh_enable(); |
9fb9cbb1 YK |
321 | |
322 | return NULL; | |
323 | } | |
13b18339 | 324 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
325 | |
326 | /* Find a connection corresponding to a tuple. */ | |
327 | struct nf_conntrack_tuple_hash * | |
400dad39 | 328 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 YK |
329 | { |
330 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 331 | struct nf_conn *ct; |
9fb9cbb1 | 332 | |
76507f69 | 333 | rcu_read_lock(); |
ea781f19 | 334 | begin: |
400dad39 | 335 | h = __nf_conntrack_find(net, tuple); |
76507f69 PM |
336 | if (h) { |
337 | ct = nf_ct_tuplehash_to_ctrack(h); | |
338 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) | |
339 | h = NULL; | |
ea781f19 ED |
340 | else { |
341 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) { | |
342 | nf_ct_put(ct); | |
343 | goto begin; | |
344 | } | |
345 | } | |
76507f69 PM |
346 | } |
347 | rcu_read_unlock(); | |
9fb9cbb1 YK |
348 | |
349 | return h; | |
350 | } | |
13b18339 | 351 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 352 | |
c1d10adb PNA |
353 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
354 | unsigned int hash, | |
601e68e1 | 355 | unsigned int repl_hash) |
c1d10adb | 356 | { |
400dad39 AD |
357 | struct net *net = nf_ct_net(ct); |
358 | ||
ea781f19 | 359 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 360 | &net->ct.hash[hash]); |
ea781f19 | 361 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 362 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
363 | } |
364 | ||
365 | void nf_conntrack_hash_insert(struct nf_conn *ct) | |
366 | { | |
367 | unsigned int hash, repl_hash; | |
368 | ||
369 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
370 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
371 | ||
c1d10adb | 372 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
c1d10adb | 373 | } |
13b18339 | 374 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
c1d10adb | 375 | |
9fb9cbb1 YK |
376 | /* Confirm a connection given skb; places it in hash table */ |
377 | int | |
3db05fea | 378 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
379 | { |
380 | unsigned int hash, repl_hash; | |
df0933dc | 381 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 382 | struct nf_conn *ct; |
df0933dc | 383 | struct nf_conn_help *help; |
ea781f19 | 384 | struct hlist_nulls_node *n; |
9fb9cbb1 | 385 | enum ip_conntrack_info ctinfo; |
400dad39 | 386 | struct net *net; |
9fb9cbb1 | 387 | |
3db05fea | 388 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 389 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
390 | |
391 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
392 | ICMP/TCP RST packets in other direction. Actual packet | |
393 | which created connection will be IP_CT_NEW or for an | |
394 | expected connection, IP_CT_RELATED. */ | |
395 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
396 | return NF_ACCEPT; | |
397 | ||
398 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
399 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
400 | ||
401 | /* We're not in hash table, and we refuse to set up related | |
402 | connections for unconfirmed conns. But packet copies and | |
403 | REJECT will give spurious warnings here. */ | |
404 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
405 | ||
406 | /* No external references means noone else could have | |
407 | confirmed us. */ | |
408 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 409 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 410 | |
f8ba1aff | 411 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
412 | |
413 | /* See if there's one in the list already, including reverse: | |
414 | NAT could have grabbed it without realizing, since we're | |
415 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 416 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc PM |
417 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
418 | &h->tuple)) | |
419 | goto out; | |
ea781f19 | 420 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc PM |
421 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
422 | &h->tuple)) | |
423 | goto out; | |
9fb9cbb1 | 424 | |
df0933dc | 425 | /* Remove from unconfirmed list */ |
ea781f19 | 426 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc PM |
427 | |
428 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
429 | /* Timer relative to confirmation time, not original | |
430 | setting time, otherwise we'd get timer wrap in | |
431 | weird delay cases. */ | |
432 | ct->timeout.expires += jiffies; | |
433 | add_timer(&ct->timeout); | |
434 | atomic_inc(&ct->ct_general.use); | |
435 | set_bit(IPS_CONFIRMED_BIT, &ct->status); | |
0d55af87 | 436 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 437 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
438 | help = nfct_help(ct); |
439 | if (help && help->helper) | |
a71996fc | 440 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 441 | |
df0933dc | 442 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 443 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 444 | return NF_ACCEPT; |
9fb9cbb1 | 445 | |
df0933dc | 446 | out: |
0d55af87 | 447 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 448 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
449 | return NF_DROP; |
450 | } | |
13b18339 | 451 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
452 | |
453 | /* Returns true if a connection correspondings to the tuple (required | |
454 | for NAT). */ | |
455 | int | |
456 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
457 | const struct nf_conn *ignored_conntrack) | |
458 | { | |
400dad39 | 459 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 460 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 461 | struct hlist_nulls_node *n; |
ba419aff | 462 | unsigned int hash = hash_conntrack(tuple); |
9fb9cbb1 | 463 | |
4e29e9ec PM |
464 | /* Disable BHs the entire time since we need to disable them at |
465 | * least once for the stats anyway. | |
466 | */ | |
467 | rcu_read_lock_bh(); | |
ea781f19 | 468 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
ba419aff PM |
469 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
470 | nf_ct_tuple_equal(tuple, &h->tuple)) { | |
0d55af87 | 471 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 472 | rcu_read_unlock_bh(); |
ba419aff PM |
473 | return 1; |
474 | } | |
0d55af87 | 475 | NF_CT_STAT_INC(net, searched); |
ba419aff | 476 | } |
4e29e9ec | 477 | rcu_read_unlock_bh(); |
9fb9cbb1 | 478 | |
ba419aff | 479 | return 0; |
9fb9cbb1 | 480 | } |
13b18339 | 481 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 482 | |
7ae7730f PM |
483 | #define NF_CT_EVICTION_RANGE 8 |
484 | ||
9fb9cbb1 YK |
485 | /* There's a small race here where we may free a just-assured |
486 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 487 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 488 | { |
f205c5e0 | 489 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 490 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 491 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 492 | struct hlist_nulls_node *n; |
7ae7730f | 493 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
494 | int dropped = 0; |
495 | ||
76507f69 | 496 | rcu_read_lock(); |
7ae7730f | 497 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
498 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
499 | hnnode) { | |
7ae7730f PM |
500 | tmp = nf_ct_tuplehash_to_ctrack(h); |
501 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
502 | ct = tmp; | |
503 | cnt++; | |
504 | } | |
76507f69 PM |
505 | |
506 | if (ct && unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) | |
507 | ct = NULL; | |
7ae7730f PM |
508 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
509 | break; | |
510 | hash = (hash + 1) % nf_conntrack_htable_size; | |
9fb9cbb1 | 511 | } |
76507f69 | 512 | rcu_read_unlock(); |
9fb9cbb1 YK |
513 | |
514 | if (!ct) | |
515 | return dropped; | |
516 | ||
517 | if (del_timer(&ct->timeout)) { | |
518 | death_by_timeout((unsigned long)ct); | |
519 | dropped = 1; | |
0d55af87 | 520 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
9fb9cbb1 YK |
521 | } |
522 | nf_ct_put(ct); | |
523 | return dropped; | |
524 | } | |
525 | ||
5a1fb391 AD |
526 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
527 | const struct nf_conntrack_tuple *orig, | |
b891c5a8 PNA |
528 | const struct nf_conntrack_tuple *repl, |
529 | gfp_t gfp) | |
9fb9cbb1 | 530 | { |
cd7fcbf1 | 531 | struct nf_conn *ct; |
9fb9cbb1 | 532 | |
dc808fe2 | 533 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
af07d241 HPP |
534 | get_random_bytes(&nf_conntrack_hash_rnd, |
535 | sizeof(nf_conntrack_hash_rnd)); | |
9fb9cbb1 YK |
536 | nf_conntrack_hash_rnd_initted = 1; |
537 | } | |
538 | ||
5251e2d2 | 539 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 540 | atomic_inc(&net->ct.count); |
5251e2d2 | 541 | |
76eb9460 | 542 | if (nf_conntrack_max && |
49ac8713 | 543 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
9fb9cbb1 | 544 | unsigned int hash = hash_conntrack(orig); |
400dad39 | 545 | if (!early_drop(net, hash)) { |
49ac8713 | 546 | atomic_dec(&net->ct.count); |
9fb9cbb1 YK |
547 | if (net_ratelimit()) |
548 | printk(KERN_WARNING | |
549 | "nf_conntrack: table full, dropping" | |
550 | " packet.\n"); | |
551 | return ERR_PTR(-ENOMEM); | |
552 | } | |
553 | } | |
554 | ||
b891c5a8 | 555 | ct = kmem_cache_zalloc(nf_conntrack_cachep, gfp); |
c88130bc | 556 | if (ct == NULL) { |
0d53778e | 557 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
49ac8713 | 558 | atomic_dec(&net->ct.count); |
dacd2a1a | 559 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 YK |
560 | } |
561 | ||
440f0d58 | 562 | spin_lock_init(&ct->lock); |
c88130bc PM |
563 | atomic_set(&ct->ct_general.use, 1); |
564 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; | |
565 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; | |
9fb9cbb1 | 566 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 567 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
5a1fb391 AD |
568 | #ifdef CONFIG_NET_NS |
569 | ct->ct_net = net; | |
570 | #endif | |
9fb9cbb1 | 571 | |
c88130bc | 572 | return ct; |
9fb9cbb1 | 573 | } |
13b18339 | 574 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 575 | |
c88130bc | 576 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 577 | { |
1d45209d ED |
578 | struct net *net = nf_ct_net(ct); |
579 | ||
ceeff754 | 580 | nf_ct_ext_destroy(ct); |
1d45209d | 581 | atomic_dec(&net->ct.count); |
ea781f19 ED |
582 | nf_ct_ext_free(ct); |
583 | kmem_cache_free(nf_conntrack_cachep, ct); | |
76507f69 | 584 | } |
13b18339 | 585 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 YK |
586 | |
587 | /* Allocate a new conntrack: we return -ENOMEM if classification | |
588 | failed due to stress. Otherwise it really is unclassifiable. */ | |
589 | static struct nf_conntrack_tuple_hash * | |
5a1fb391 AD |
590 | init_conntrack(struct net *net, |
591 | const struct nf_conntrack_tuple *tuple, | |
9fb9cbb1 | 592 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 593 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
594 | struct sk_buff *skb, |
595 | unsigned int dataoff) | |
596 | { | |
c88130bc | 597 | struct nf_conn *ct; |
3c158f7f | 598 | struct nf_conn_help *help; |
9fb9cbb1 YK |
599 | struct nf_conntrack_tuple repl_tuple; |
600 | struct nf_conntrack_expect *exp; | |
601 | ||
605dcad6 | 602 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 603 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
604 | return NULL; |
605 | } | |
606 | ||
5a1fb391 | 607 | ct = nf_conntrack_alloc(net, tuple, &repl_tuple, GFP_ATOMIC); |
cd7fcbf1 | 608 | if (IS_ERR(ct)) { |
0d53778e | 609 | pr_debug("Can't allocate conntrack.\n"); |
c88130bc | 610 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 YK |
611 | } |
612 | ||
c88130bc PM |
613 | if (!l4proto->new(ct, skb, dataoff)) { |
614 | nf_conntrack_free(ct); | |
0d53778e | 615 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
616 | return NULL; |
617 | } | |
618 | ||
58401572 | 619 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a0891aa6 | 620 | nf_ct_ecache_ext_add(ct, GFP_ATOMIC); |
58401572 | 621 | |
f8ba1aff | 622 | spin_lock_bh(&nf_conntrack_lock); |
9b03f38d | 623 | exp = nf_ct_find_expectation(net, tuple); |
9fb9cbb1 | 624 | if (exp) { |
0d53778e | 625 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 626 | ct, exp); |
9fb9cbb1 | 627 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
628 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
629 | ct->master = exp->master; | |
ceceae1b | 630 | if (exp->helper) { |
c88130bc | 631 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ceceae1b YK |
632 | if (help) |
633 | rcu_assign_pointer(help->helper, exp->helper); | |
ceceae1b YK |
634 | } |
635 | ||
9fb9cbb1 | 636 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 637 | ct->mark = exp->master->mark; |
7c9728c3 JM |
638 | #endif |
639 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 640 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 641 | #endif |
c88130bc | 642 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 643 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 644 | } else { |
226c0c0e | 645 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
0d55af87 | 646 | NF_CT_STAT_INC(net, new); |
22e7410b | 647 | } |
9fb9cbb1 YK |
648 | |
649 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 650 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 651 | &net->ct.unconfirmed); |
9fb9cbb1 | 652 | |
f8ba1aff | 653 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
654 | |
655 | if (exp) { | |
656 | if (exp->expectfn) | |
c88130bc | 657 | exp->expectfn(ct, exp); |
6823645d | 658 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
659 | } |
660 | ||
c88130bc | 661 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
662 | } |
663 | ||
664 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
665 | static inline struct nf_conn * | |
a702a65f AD |
666 | resolve_normal_ct(struct net *net, |
667 | struct sk_buff *skb, | |
9fb9cbb1 YK |
668 | unsigned int dataoff, |
669 | u_int16_t l3num, | |
670 | u_int8_t protonum, | |
671 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 672 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
673 | int *set_reply, |
674 | enum ip_conntrack_info *ctinfo) | |
675 | { | |
676 | struct nf_conntrack_tuple tuple; | |
677 | struct nf_conntrack_tuple_hash *h; | |
678 | struct nf_conn *ct; | |
679 | ||
bbe735e4 | 680 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 681 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 682 | l4proto)) { |
0d53778e | 683 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
684 | return NULL; |
685 | } | |
686 | ||
687 | /* look for tuple match */ | |
a702a65f | 688 | h = nf_conntrack_find_get(net, &tuple); |
9fb9cbb1 | 689 | if (!h) { |
a702a65f | 690 | h = init_conntrack(net, &tuple, l3proto, l4proto, skb, dataoff); |
9fb9cbb1 YK |
691 | if (!h) |
692 | return NULL; | |
693 | if (IS_ERR(h)) | |
694 | return (void *)h; | |
695 | } | |
696 | ct = nf_ct_tuplehash_to_ctrack(h); | |
697 | ||
698 | /* It exists; we have (non-exclusive) reference. */ | |
699 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
700 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; | |
701 | /* Please set reply bit if this packet OK */ | |
702 | *set_reply = 1; | |
703 | } else { | |
704 | /* Once we've had two way comms, always ESTABLISHED. */ | |
705 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 706 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
707 | *ctinfo = IP_CT_ESTABLISHED; |
708 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
709 | pr_debug("nf_conntrack_in: related packet for %p\n", |
710 | ct); | |
9fb9cbb1 YK |
711 | *ctinfo = IP_CT_RELATED; |
712 | } else { | |
0d53778e | 713 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
714 | *ctinfo = IP_CT_NEW; |
715 | } | |
716 | *set_reply = 0; | |
717 | } | |
718 | skb->nfct = &ct->ct_general; | |
719 | skb->nfctinfo = *ctinfo; | |
720 | return ct; | |
721 | } | |
722 | ||
723 | unsigned int | |
a702a65f AD |
724 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
725 | struct sk_buff *skb) | |
9fb9cbb1 YK |
726 | { |
727 | struct nf_conn *ct; | |
728 | enum ip_conntrack_info ctinfo; | |
729 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 730 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 YK |
731 | unsigned int dataoff; |
732 | u_int8_t protonum; | |
733 | int set_reply = 0; | |
734 | int ret; | |
735 | ||
736 | /* Previously seen (loopback or untracked)? Ignore. */ | |
3db05fea | 737 | if (skb->nfct) { |
0d55af87 | 738 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
9fb9cbb1 YK |
739 | return NF_ACCEPT; |
740 | } | |
741 | ||
923f4902 | 742 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 743 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 744 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
745 | &dataoff, &protonum); |
746 | if (ret <= 0) { | |
0d53778e | 747 | pr_debug("not prepared to track yet or error occured\n"); |
0d55af87 AD |
748 | NF_CT_STAT_INC_ATOMIC(net, error); |
749 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
9fb9cbb1 YK |
750 | return -ret; |
751 | } | |
752 | ||
76108cea | 753 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
754 | |
755 | /* It may be an special packet, error, unclean... | |
756 | * inverse of the return code tells to the netfilter | |
757 | * core what to do with the packet. */ | |
74c51a14 AD |
758 | if (l4proto->error != NULL) { |
759 | ret = l4proto->error(net, skb, dataoff, &ctinfo, pf, hooknum); | |
760 | if (ret <= 0) { | |
0d55af87 AD |
761 | NF_CT_STAT_INC_ATOMIC(net, error); |
762 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
74c51a14 AD |
763 | return -ret; |
764 | } | |
9fb9cbb1 YK |
765 | } |
766 | ||
a702a65f AD |
767 | ct = resolve_normal_ct(net, skb, dataoff, pf, protonum, |
768 | l3proto, l4proto, &set_reply, &ctinfo); | |
9fb9cbb1 YK |
769 | if (!ct) { |
770 | /* Not valid part of a connection */ | |
0d55af87 | 771 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
9fb9cbb1 YK |
772 | return NF_ACCEPT; |
773 | } | |
774 | ||
775 | if (IS_ERR(ct)) { | |
776 | /* Too stressed to deal. */ | |
0d55af87 | 777 | NF_CT_STAT_INC_ATOMIC(net, drop); |
9fb9cbb1 YK |
778 | return NF_DROP; |
779 | } | |
780 | ||
3db05fea | 781 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 782 | |
3db05fea | 783 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
ec8d5409 | 784 | if (ret <= 0) { |
9fb9cbb1 YK |
785 | /* Invalid: inverse of the return code tells |
786 | * the netfilter core what to do */ | |
0d53778e | 787 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
788 | nf_conntrack_put(skb->nfct); |
789 | skb->nfct = NULL; | |
0d55af87 | 790 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
791 | if (ret == -NF_DROP) |
792 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
9fb9cbb1 YK |
793 | return -ret; |
794 | } | |
795 | ||
796 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
a71996fc | 797 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 YK |
798 | |
799 | return ret; | |
800 | } | |
13b18339 | 801 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 802 | |
5f2b4c90 JE |
803 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
804 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 805 | { |
5f2b4c90 | 806 | bool ret; |
923f4902 PM |
807 | |
808 | rcu_read_lock(); | |
809 | ret = nf_ct_invert_tuple(inverse, orig, | |
810 | __nf_ct_l3proto_find(orig->src.l3num), | |
811 | __nf_ct_l4proto_find(orig->src.l3num, | |
812 | orig->dst.protonum)); | |
813 | rcu_read_unlock(); | |
814 | return ret; | |
9fb9cbb1 | 815 | } |
13b18339 | 816 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 817 | |
5b1158e9 JK |
818 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
819 | implicitly racy: see __nf_conntrack_confirm */ | |
820 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
821 | const struct nf_conntrack_tuple *newreply) | |
822 | { | |
823 | struct nf_conn_help *help = nfct_help(ct); | |
824 | ||
5b1158e9 JK |
825 | /* Should be unconfirmed, so not in hash table yet */ |
826 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
827 | ||
0d53778e | 828 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 829 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
830 | |
831 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 832 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 833 | return; |
ceceae1b | 834 | |
c52fbb41 | 835 | rcu_read_lock(); |
226c0c0e | 836 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
c52fbb41 | 837 | rcu_read_unlock(); |
5b1158e9 | 838 | } |
13b18339 | 839 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 840 | |
9fb9cbb1 YK |
841 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
842 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
843 | enum ip_conntrack_info ctinfo, | |
844 | const struct sk_buff *skb, | |
845 | unsigned long extra_jiffies, | |
846 | int do_acct) | |
847 | { | |
9fb9cbb1 YK |
848 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
849 | NF_CT_ASSERT(skb); | |
850 | ||
997ae831 | 851 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
852 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
853 | goto acct; | |
997ae831 | 854 | |
9fb9cbb1 YK |
855 | /* If not in hash table, timer will not be active yet */ |
856 | if (!nf_ct_is_confirmed(ct)) { | |
857 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 858 | } else { |
be00c8e4 MJ |
859 | unsigned long newtime = jiffies + extra_jiffies; |
860 | ||
861 | /* Only update the timeout if the new timeout is at least | |
862 | HZ jiffies from the old timeout. Need del_timer for race | |
863 | avoidance (may already be dying). */ | |
65cb9fda PM |
864 | if (newtime - ct->timeout.expires >= HZ) |
865 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
866 | } |
867 | ||
47d95045 | 868 | acct: |
9fb9cbb1 | 869 | if (do_acct) { |
58401572 | 870 | struct nf_conn_counter *acct; |
3ffd5eeb | 871 | |
58401572 KPO |
872 | acct = nf_conn_acct_find(ct); |
873 | if (acct) { | |
65cb9fda | 874 | spin_lock_bh(&ct->lock); |
58401572 KPO |
875 | acct[CTINFO2DIR(ctinfo)].packets++; |
876 | acct[CTINFO2DIR(ctinfo)].bytes += | |
877 | skb->len - skb_network_offset(skb); | |
65cb9fda | 878 | spin_unlock_bh(&ct->lock); |
58401572 | 879 | } |
9fb9cbb1 | 880 | } |
9fb9cbb1 | 881 | } |
13b18339 | 882 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 883 | |
4c889498 DM |
884 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
885 | enum ip_conntrack_info ctinfo, | |
886 | const struct sk_buff *skb, | |
887 | int do_acct) | |
51091764 | 888 | { |
718d4ad9 | 889 | if (do_acct) { |
58401572 KPO |
890 | struct nf_conn_counter *acct; |
891 | ||
58401572 KPO |
892 | acct = nf_conn_acct_find(ct); |
893 | if (acct) { | |
65cb9fda | 894 | spin_lock_bh(&ct->lock); |
58401572 KPO |
895 | acct[CTINFO2DIR(ctinfo)].packets++; |
896 | acct[CTINFO2DIR(ctinfo)].bytes += | |
897 | skb->len - skb_network_offset(skb); | |
65cb9fda | 898 | spin_unlock_bh(&ct->lock); |
58401572 | 899 | } |
718d4ad9 | 900 | } |
58401572 | 901 | |
4c889498 | 902 | if (del_timer(&ct->timeout)) { |
51091764 | 903 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
904 | return true; |
905 | } | |
906 | return false; | |
51091764 | 907 | } |
718d4ad9 | 908 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 909 | |
e281db5c | 910 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
911 | |
912 | #include <linux/netfilter/nfnetlink.h> | |
913 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
914 | #include <linux/mutex.h> |
915 | ||
c1d10adb PNA |
916 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
917 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
918 | * or depend on ctnetlink */ | |
fdf70832 | 919 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
920 | const struct nf_conntrack_tuple *tuple) |
921 | { | |
77236b6e PM |
922 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
923 | NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); | |
c1d10adb PNA |
924 | return 0; |
925 | ||
df6fb868 | 926 | nla_put_failure: |
c1d10adb PNA |
927 | return -1; |
928 | } | |
fdf70832 | 929 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 930 | |
f73e924c PM |
931 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
932 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
933 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 934 | }; |
f73e924c | 935 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 936 | |
fdf70832 | 937 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
938 | struct nf_conntrack_tuple *t) |
939 | { | |
df6fb868 | 940 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
941 | return -EINVAL; |
942 | ||
77236b6e PM |
943 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
944 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
945 | |
946 | return 0; | |
947 | } | |
fdf70832 | 948 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
949 | |
950 | int nf_ct_port_nlattr_tuple_size(void) | |
951 | { | |
952 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
955 | #endif |
956 | ||
9fb9cbb1 | 957 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc | 958 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb1 YK |
959 | { |
960 | struct nf_conn *ct; | |
961 | enum ip_conntrack_info ctinfo; | |
962 | ||
963 | /* This ICMP is in reverse direction to the packet which caused it */ | |
964 | ct = nf_ct_get(skb, &ctinfo); | |
965 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
966 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; | |
967 | else | |
968 | ctinfo = IP_CT_RELATED; | |
969 | ||
970 | /* Attach to new skbuff, and increment count */ | |
971 | nskb->nfct = &ct->ct_general; | |
972 | nskb->nfctinfo = ctinfo; | |
973 | nf_conntrack_get(nskb->nfct); | |
974 | } | |
975 | ||
9fb9cbb1 | 976 | /* Bring out ya dead! */ |
df0933dc | 977 | static struct nf_conn * |
400dad39 | 978 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
979 | void *data, unsigned int *bucket) |
980 | { | |
df0933dc PM |
981 | struct nf_conntrack_tuple_hash *h; |
982 | struct nf_conn *ct; | |
ea781f19 | 983 | struct hlist_nulls_node *n; |
9fb9cbb1 | 984 | |
f8ba1aff | 985 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 986 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
ea781f19 | 987 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
df0933dc PM |
988 | ct = nf_ct_tuplehash_to_ctrack(h); |
989 | if (iter(ct, data)) | |
990 | goto found; | |
991 | } | |
601e68e1 | 992 | } |
ea781f19 | 993 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
994 | ct = nf_ct_tuplehash_to_ctrack(h); |
995 | if (iter(ct, data)) | |
ec68e97d | 996 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 997 | } |
f8ba1aff | 998 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
999 | return NULL; |
1000 | found: | |
c073e3fa | 1001 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1002 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1003 | return ct; |
9fb9cbb1 YK |
1004 | } |
1005 | ||
400dad39 AD |
1006 | void nf_ct_iterate_cleanup(struct net *net, |
1007 | int (*iter)(struct nf_conn *i, void *data), | |
1008 | void *data) | |
9fb9cbb1 | 1009 | { |
df0933dc | 1010 | struct nf_conn *ct; |
9fb9cbb1 YK |
1011 | unsigned int bucket = 0; |
1012 | ||
400dad39 | 1013 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1014 | /* Time to push up daises... */ |
1015 | if (del_timer(&ct->timeout)) | |
1016 | death_by_timeout((unsigned long)ct); | |
1017 | /* ... else the timer will get him soon. */ | |
1018 | ||
1019 | nf_ct_put(ct); | |
1020 | } | |
1021 | } | |
13b18339 | 1022 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1023 | |
19abb7b0 PNA |
1024 | struct __nf_ct_flush_report { |
1025 | u32 pid; | |
1026 | int report; | |
1027 | }; | |
1028 | ||
274d383b | 1029 | static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb1 | 1030 | { |
19abb7b0 PNA |
1031 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
1032 | ||
dd7669a9 PNA |
1033 | /* If we fail to deliver the event, death_by_timeout() will retry */ |
1034 | if (nf_conntrack_event_report(IPCT_DESTROY, i, | |
1035 | fr->pid, fr->report) < 0) | |
1036 | return 1; | |
1037 | ||
1038 | /* Avoid the delivery of the destroy event in death_by_timeout(). */ | |
1039 | set_bit(IPS_DYING_BIT, &i->status); | |
9fb9cbb1 YK |
1040 | return 1; |
1041 | } | |
1042 | ||
274d383b PNA |
1043 | static int kill_all(struct nf_conn *i, void *data) |
1044 | { | |
1045 | return 1; | |
1046 | } | |
1047 | ||
ea781f19 | 1048 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
9fb9cbb1 YK |
1049 | { |
1050 | if (vmalloced) | |
1051 | vfree(hash); | |
1052 | else | |
601e68e1 | 1053 | free_pages((unsigned long)hash, |
f205c5e0 | 1054 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1055 | } |
ac565e5f | 1056 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1057 | |
274d383b | 1058 | void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
c1d10adb | 1059 | { |
19abb7b0 PNA |
1060 | struct __nf_ct_flush_report fr = { |
1061 | .pid = pid, | |
1062 | .report = report, | |
1063 | }; | |
274d383b | 1064 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb | 1065 | } |
274d383b | 1066 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1067 | |
dd7669a9 PNA |
1068 | static void nf_ct_release_dying_list(void) |
1069 | { | |
1070 | struct nf_conntrack_tuple_hash *h; | |
1071 | struct nf_conn *ct; | |
1072 | struct hlist_nulls_node *n; | |
1073 | ||
1074 | spin_lock_bh(&nf_conntrack_lock); | |
1075 | hlist_nulls_for_each_entry(h, n, &init_net.ct.dying, hnnode) { | |
1076 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1077 | /* never fails to remove them, no listeners at this point */ | |
1078 | nf_ct_kill(ct); | |
1079 | } | |
1080 | spin_unlock_bh(&nf_conntrack_lock); | |
1081 | } | |
1082 | ||
08f6547d | 1083 | static void nf_conntrack_cleanup_init_net(void) |
9fb9cbb1 | 1084 | { |
08f6547d AD |
1085 | nf_conntrack_helper_fini(); |
1086 | nf_conntrack_proto_fini(); | |
1087 | kmem_cache_destroy(nf_conntrack_cachep); | |
1088 | } | |
9fb9cbb1 | 1089 | |
08f6547d AD |
1090 | static void nf_conntrack_cleanup_net(struct net *net) |
1091 | { | |
9fb9cbb1 | 1092 | i_see_dead_people: |
274d383b | 1093 | nf_ct_iterate_cleanup(net, kill_all, NULL); |
dd7669a9 | 1094 | nf_ct_release_dying_list(); |
49ac8713 | 1095 | if (atomic_read(&net->ct.count) != 0) { |
9fb9cbb1 YK |
1096 | schedule(); |
1097 | goto i_see_dead_people; | |
1098 | } | |
6636568c PM |
1099 | /* wait until all references to nf_conntrack_untracked are dropped */ |
1100 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) | |
1101 | schedule(); | |
9fb9cbb1 | 1102 | |
400dad39 | 1103 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1104 | nf_conntrack_htable_size); |
a0891aa6 | 1105 | nf_conntrack_ecache_fini(net); |
d716a4df | 1106 | nf_conntrack_acct_fini(net); |
9b03f38d | 1107 | nf_conntrack_expect_fini(net); |
0d55af87 | 1108 | free_percpu(net->ct.stat); |
08f6547d AD |
1109 | } |
1110 | ||
1111 | /* Mishearing the voices in his head, our hero wonders how he's | |
1112 | supposed to kill the mall. */ | |
1113 | void nf_conntrack_cleanup(struct net *net) | |
1114 | { | |
1115 | if (net_eq(net, &init_net)) | |
1116 | rcu_assign_pointer(ip_ct_attach, NULL); | |
1117 | ||
1118 | /* This makes sure all current packets have passed through | |
1119 | netfilter framework. Roll on, two-stage module | |
1120 | delete... */ | |
1121 | synchronize_net(); | |
1122 | ||
1123 | nf_conntrack_cleanup_net(net); | |
1124 | ||
1125 | if (net_eq(net, &init_net)) { | |
1126 | rcu_assign_pointer(nf_ct_destroy, NULL); | |
1127 | nf_conntrack_cleanup_init_net(); | |
1128 | } | |
9fb9cbb1 YK |
1129 | } |
1130 | ||
ea781f19 | 1131 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
9fb9cbb1 | 1132 | { |
ea781f19 ED |
1133 | struct hlist_nulls_head *hash; |
1134 | unsigned int nr_slots, i; | |
1135 | size_t sz; | |
9fb9cbb1 | 1136 | |
601e68e1 | 1137 | *vmalloced = 0; |
8e5105a0 | 1138 | |
ea781f19 ED |
1139 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1140 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1141 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1142 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1143 | get_order(sz)); | |
601e68e1 | 1144 | if (!hash) { |
9fb9cbb1 YK |
1145 | *vmalloced = 1; |
1146 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); | |
ea781f19 | 1147 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
9fb9cbb1 YK |
1148 | } |
1149 | ||
ea781f19 ED |
1150 | if (hash && nulls) |
1151 | for (i = 0; i < nr_slots; i++) | |
1152 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1153 | |
1154 | return hash; | |
1155 | } | |
ac565e5f | 1156 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1157 | |
fae718dd | 1158 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1159 | { |
96eb24d7 SH |
1160 | int i, bucket, vmalloced, old_vmalloced; |
1161 | unsigned int hashsize, old_size; | |
9fb9cbb1 | 1162 | int rnd; |
ea781f19 | 1163 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 YK |
1164 | struct nf_conntrack_tuple_hash *h; |
1165 | ||
1166 | /* On boot, we can set this without any fancy locking. */ | |
1167 | if (!nf_conntrack_htable_size) | |
1168 | return param_set_uint(val, kp); | |
1169 | ||
96eb24d7 | 1170 | hashsize = simple_strtoul(val, NULL, 0); |
9fb9cbb1 YK |
1171 | if (!hashsize) |
1172 | return -EINVAL; | |
1173 | ||
ea781f19 | 1174 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
9fb9cbb1 YK |
1175 | if (!hash) |
1176 | return -ENOMEM; | |
1177 | ||
1178 | /* We have to rehahs for the new table anyway, so we also can | |
1179 | * use a newrandom seed */ | |
af07d241 | 1180 | get_random_bytes(&rnd, sizeof(rnd)); |
9fb9cbb1 | 1181 | |
76507f69 PM |
1182 | /* Lookups in the old hash might happen in parallel, which means we |
1183 | * might get false negatives during connection lookup. New connections | |
1184 | * created because of a false negative won't make it into the hash | |
1185 | * though since that required taking the lock. | |
1186 | */ | |
f8ba1aff | 1187 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1188 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
1189 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1190 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1191 | struct nf_conntrack_tuple_hash, hnnode); | |
1192 | hlist_nulls_del_rcu(&h->hnnode); | |
9fb9cbb1 | 1193 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
ea781f19 | 1194 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1195 | } |
1196 | } | |
1197 | old_size = nf_conntrack_htable_size; | |
400dad39 AD |
1198 | old_vmalloced = init_net.ct.hash_vmalloc; |
1199 | old_hash = init_net.ct.hash; | |
9fb9cbb1 YK |
1200 | |
1201 | nf_conntrack_htable_size = hashsize; | |
400dad39 AD |
1202 | init_net.ct.hash_vmalloc = vmalloced; |
1203 | init_net.ct.hash = hash; | |
9fb9cbb1 | 1204 | nf_conntrack_hash_rnd = rnd; |
f8ba1aff | 1205 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1206 | |
ac565e5f | 1207 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
9fb9cbb1 YK |
1208 | return 0; |
1209 | } | |
fae718dd | 1210 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1211 | |
fae718dd | 1212 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1213 | &nf_conntrack_htable_size, 0600); |
1214 | ||
08f6547d | 1215 | static int nf_conntrack_init_init_net(void) |
9fb9cbb1 | 1216 | { |
f205c5e0 | 1217 | int max_factor = 8; |
9fb9cbb1 YK |
1218 | int ret; |
1219 | ||
1220 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1221 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1222 | if (!nf_conntrack_htable_size) { |
1223 | nf_conntrack_htable_size | |
1224 | = (((num_physpages << PAGE_SHIFT) / 16384) | |
f205c5e0 | 1225 | / sizeof(struct hlist_head)); |
9fb9cbb1 | 1226 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1227 | nf_conntrack_htable_size = 16384; |
1228 | if (nf_conntrack_htable_size < 32) | |
1229 | nf_conntrack_htable_size = 32; | |
1230 | ||
1231 | /* Use a max. factor of four by default to get the same max as | |
1232 | * with the old struct list_heads. When a table size is given | |
1233 | * we use the old value of 8 to avoid reducing the max. | |
1234 | * entries. */ | |
1235 | max_factor = 4; | |
9fb9cbb1 | 1236 | } |
f205c5e0 | 1237 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 PM |
1238 | |
1239 | printk("nf_conntrack version %s (%u buckets, %d max)\n", | |
1240 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, | |
1241 | nf_conntrack_max); | |
1242 | ||
dacd2a1a YK |
1243 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
1244 | sizeof(struct nf_conn), | |
ea781f19 | 1245 | 0, SLAB_DESTROY_BY_RCU, NULL); |
dacd2a1a | 1246 | if (!nf_conntrack_cachep) { |
9fb9cbb1 | 1247 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
08f6547d AD |
1248 | ret = -ENOMEM; |
1249 | goto err_cache; | |
9fb9cbb1 YK |
1250 | } |
1251 | ||
e9c1b084 PM |
1252 | ret = nf_conntrack_proto_init(); |
1253 | if (ret < 0) | |
08f6547d | 1254 | goto err_proto; |
933a41e7 | 1255 | |
ceceae1b YK |
1256 | ret = nf_conntrack_helper_init(); |
1257 | if (ret < 0) | |
08f6547d AD |
1258 | goto err_helper; |
1259 | ||
1260 | return 0; | |
1261 | ||
1262 | err_helper: | |
1263 | nf_conntrack_proto_fini(); | |
1264 | err_proto: | |
1265 | kmem_cache_destroy(nf_conntrack_cachep); | |
1266 | err_cache: | |
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | static int nf_conntrack_init_net(struct net *net) | |
1271 | { | |
1272 | int ret; | |
ceceae1b | 1273 | |
08f6547d | 1274 | atomic_set(&net->ct.count, 0); |
ea781f19 | 1275 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0); |
dd7669a9 | 1276 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, 0); |
08f6547d AD |
1277 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1278 | if (!net->ct.stat) { | |
1279 | ret = -ENOMEM; | |
1280 | goto err_stat; | |
1281 | } | |
08f6547d | 1282 | net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
ea781f19 | 1283 | &net->ct.hash_vmalloc, 1); |
08f6547d AD |
1284 | if (!net->ct.hash) { |
1285 | ret = -ENOMEM; | |
1286 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1287 | goto err_hash; | |
1288 | } | |
1289 | ret = nf_conntrack_expect_init(net); | |
1290 | if (ret < 0) | |
1291 | goto err_expect; | |
d716a4df | 1292 | ret = nf_conntrack_acct_init(net); |
58401572 | 1293 | if (ret < 0) |
08f6547d | 1294 | goto err_acct; |
a0891aa6 PNA |
1295 | ret = nf_conntrack_ecache_init(net); |
1296 | if (ret < 0) | |
1297 | goto err_ecache; | |
7d3cdc6b | 1298 | |
9fb9cbb1 YK |
1299 | /* Set up fake conntrack: |
1300 | - to never be deleted, not in any hashes */ | |
5a1fb391 AD |
1301 | #ifdef CONFIG_NET_NS |
1302 | nf_conntrack_untracked.ct_net = &init_net; | |
1303 | #endif | |
9fb9cbb1 YK |
1304 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
1305 | /* - and look it like as a confirmed connection */ | |
1306 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); | |
1307 | ||
08f6547d | 1308 | return 0; |
9fb9cbb1 | 1309 | |
a0891aa6 PNA |
1310 | err_ecache: |
1311 | nf_conntrack_acct_fini(net); | |
08f6547d | 1312 | err_acct: |
9b03f38d | 1313 | nf_conntrack_expect_fini(net); |
08f6547d | 1314 | err_expect: |
400dad39 | 1315 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1316 | nf_conntrack_htable_size); |
6058fa6b | 1317 | err_hash: |
0d55af87 AD |
1318 | free_percpu(net->ct.stat); |
1319 | err_stat: | |
08f6547d AD |
1320 | return ret; |
1321 | } | |
1322 | ||
1323 | int nf_conntrack_init(struct net *net) | |
1324 | { | |
1325 | int ret; | |
1326 | ||
1327 | if (net_eq(net, &init_net)) { | |
1328 | ret = nf_conntrack_init_init_net(); | |
1329 | if (ret < 0) | |
1330 | goto out_init_net; | |
1331 | } | |
1332 | ret = nf_conntrack_init_net(net); | |
1333 | if (ret < 0) | |
1334 | goto out_net; | |
1335 | ||
1336 | if (net_eq(net, &init_net)) { | |
1337 | /* For use by REJECT target */ | |
1338 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); | |
1339 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); | |
1340 | } | |
1341 | return 0; | |
1342 | ||
1343 | out_net: | |
1344 | if (net_eq(net, &init_net)) | |
1345 | nf_conntrack_cleanup_init_net(); | |
1346 | out_init_net: | |
1347 | return ret; | |
9fb9cbb1 | 1348 | } |