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, | |
39938324 | 50 | const 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); | |
8d8890b7 PM |
338 | if (unlikely(nf_ct_is_dying(ct) || |
339 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 340 | h = NULL; |
ea781f19 ED |
341 | else { |
342 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) { | |
343 | nf_ct_put(ct); | |
344 | goto begin; | |
345 | } | |
346 | } | |
76507f69 PM |
347 | } |
348 | rcu_read_unlock(); | |
9fb9cbb1 YK |
349 | |
350 | return h; | |
351 | } | |
13b18339 | 352 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 353 | |
c1d10adb PNA |
354 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
355 | unsigned int hash, | |
601e68e1 | 356 | unsigned int repl_hash) |
c1d10adb | 357 | { |
400dad39 AD |
358 | struct net *net = nf_ct_net(ct); |
359 | ||
ea781f19 | 360 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 361 | &net->ct.hash[hash]); |
ea781f19 | 362 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 363 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
364 | } |
365 | ||
366 | void nf_conntrack_hash_insert(struct nf_conn *ct) | |
367 | { | |
368 | unsigned int hash, repl_hash; | |
369 | ||
370 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
371 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
372 | ||
c1d10adb | 373 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
c1d10adb | 374 | } |
13b18339 | 375 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
c1d10adb | 376 | |
9fb9cbb1 YK |
377 | /* Confirm a connection given skb; places it in hash table */ |
378 | int | |
3db05fea | 379 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
380 | { |
381 | unsigned int hash, repl_hash; | |
df0933dc | 382 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 383 | struct nf_conn *ct; |
df0933dc | 384 | struct nf_conn_help *help; |
ea781f19 | 385 | struct hlist_nulls_node *n; |
9fb9cbb1 | 386 | enum ip_conntrack_info ctinfo; |
400dad39 | 387 | struct net *net; |
9fb9cbb1 | 388 | |
3db05fea | 389 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 390 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
391 | |
392 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
393 | ICMP/TCP RST packets in other direction. Actual packet | |
394 | which created connection will be IP_CT_NEW or for an | |
395 | expected connection, IP_CT_RELATED. */ | |
396 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
397 | return NF_ACCEPT; | |
398 | ||
399 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
400 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
401 | ||
402 | /* We're not in hash table, and we refuse to set up related | |
403 | connections for unconfirmed conns. But packet copies and | |
404 | REJECT will give spurious warnings here. */ | |
405 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
406 | ||
407 | /* No external references means noone else could have | |
408 | confirmed us. */ | |
409 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 410 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 411 | |
f8ba1aff | 412 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
413 | |
414 | /* See if there's one in the list already, including reverse: | |
415 | NAT could have grabbed it without realizing, since we're | |
416 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 417 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc PM |
418 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
419 | &h->tuple)) | |
420 | goto out; | |
ea781f19 | 421 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc PM |
422 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
423 | &h->tuple)) | |
424 | goto out; | |
9fb9cbb1 | 425 | |
df0933dc | 426 | /* Remove from unconfirmed list */ |
ea781f19 | 427 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc | 428 | |
df0933dc PM |
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); | |
5c8ec910 PM |
436 | |
437 | /* Since the lookup is lockless, hash insertion must be done after | |
438 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
439 | * guarantee that no other CPU can find the conntrack before the above | |
440 | * stores are visible. | |
441 | */ | |
442 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
0d55af87 | 443 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 444 | spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910 | 445 | |
df0933dc PM |
446 | help = nfct_help(ct); |
447 | if (help && help->helper) | |
a71996fc | 448 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 449 | |
df0933dc | 450 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 451 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 452 | return NF_ACCEPT; |
9fb9cbb1 | 453 | |
df0933dc | 454 | out: |
0d55af87 | 455 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 456 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
457 | return NF_DROP; |
458 | } | |
13b18339 | 459 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
460 | |
461 | /* Returns true if a connection correspondings to the tuple (required | |
462 | for NAT). */ | |
463 | int | |
464 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
465 | const struct nf_conn *ignored_conntrack) | |
466 | { | |
400dad39 | 467 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 468 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 469 | struct hlist_nulls_node *n; |
ba419aff | 470 | unsigned int hash = hash_conntrack(tuple); |
9fb9cbb1 | 471 | |
4e29e9ec PM |
472 | /* Disable BHs the entire time since we need to disable them at |
473 | * least once for the stats anyway. | |
474 | */ | |
475 | rcu_read_lock_bh(); | |
ea781f19 | 476 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
ba419aff PM |
477 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
478 | nf_ct_tuple_equal(tuple, &h->tuple)) { | |
0d55af87 | 479 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 480 | rcu_read_unlock_bh(); |
ba419aff PM |
481 | return 1; |
482 | } | |
0d55af87 | 483 | NF_CT_STAT_INC(net, searched); |
ba419aff | 484 | } |
4e29e9ec | 485 | rcu_read_unlock_bh(); |
9fb9cbb1 | 486 | |
ba419aff | 487 | return 0; |
9fb9cbb1 | 488 | } |
13b18339 | 489 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 490 | |
7ae7730f PM |
491 | #define NF_CT_EVICTION_RANGE 8 |
492 | ||
9fb9cbb1 YK |
493 | /* There's a small race here where we may free a just-assured |
494 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 495 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 496 | { |
f205c5e0 | 497 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 498 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 499 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 500 | struct hlist_nulls_node *n; |
7ae7730f | 501 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
502 | int dropped = 0; |
503 | ||
76507f69 | 504 | rcu_read_lock(); |
7ae7730f | 505 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
506 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
507 | hnnode) { | |
7ae7730f PM |
508 | tmp = nf_ct_tuplehash_to_ctrack(h); |
509 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
510 | ct = tmp; | |
511 | cnt++; | |
512 | } | |
76507f69 | 513 | |
8d8890b7 PM |
514 | if (ct && unlikely(nf_ct_is_dying(ct) || |
515 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 516 | ct = NULL; |
7ae7730f PM |
517 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
518 | break; | |
519 | hash = (hash + 1) % nf_conntrack_htable_size; | |
9fb9cbb1 | 520 | } |
76507f69 | 521 | rcu_read_unlock(); |
9fb9cbb1 YK |
522 | |
523 | if (!ct) | |
524 | return dropped; | |
525 | ||
526 | if (del_timer(&ct->timeout)) { | |
527 | death_by_timeout((unsigned long)ct); | |
528 | dropped = 1; | |
0d55af87 | 529 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
9fb9cbb1 YK |
530 | } |
531 | nf_ct_put(ct); | |
532 | return dropped; | |
533 | } | |
534 | ||
5a1fb391 AD |
535 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
536 | const struct nf_conntrack_tuple *orig, | |
b891c5a8 PNA |
537 | const struct nf_conntrack_tuple *repl, |
538 | gfp_t gfp) | |
9fb9cbb1 | 539 | { |
cd7fcbf1 | 540 | struct nf_conn *ct; |
9fb9cbb1 | 541 | |
dc808fe2 | 542 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
af07d241 HPP |
543 | get_random_bytes(&nf_conntrack_hash_rnd, |
544 | sizeof(nf_conntrack_hash_rnd)); | |
9fb9cbb1 YK |
545 | nf_conntrack_hash_rnd_initted = 1; |
546 | } | |
547 | ||
5251e2d2 | 548 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 549 | atomic_inc(&net->ct.count); |
5251e2d2 | 550 | |
76eb9460 | 551 | if (nf_conntrack_max && |
49ac8713 | 552 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
9fb9cbb1 | 553 | unsigned int hash = hash_conntrack(orig); |
400dad39 | 554 | if (!early_drop(net, hash)) { |
49ac8713 | 555 | atomic_dec(&net->ct.count); |
9fb9cbb1 YK |
556 | if (net_ratelimit()) |
557 | printk(KERN_WARNING | |
558 | "nf_conntrack: table full, dropping" | |
559 | " packet.\n"); | |
560 | return ERR_PTR(-ENOMEM); | |
561 | } | |
562 | } | |
563 | ||
941297f4 ED |
564 | /* |
565 | * Do not use kmem_cache_zalloc(), as this cache uses | |
566 | * SLAB_DESTROY_BY_RCU. | |
567 | */ | |
568 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); | |
c88130bc | 569 | if (ct == NULL) { |
0d53778e | 570 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
49ac8713 | 571 | atomic_dec(&net->ct.count); |
dacd2a1a | 572 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 573 | } |
941297f4 ED |
574 | /* |
575 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next | |
576 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. | |
577 | */ | |
578 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, | |
579 | sizeof(*ct) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); | |
440f0d58 | 580 | spin_lock_init(&ct->lock); |
c88130bc | 581 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 582 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 583 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
941297f4 | 584 | ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev = NULL; |
9fb9cbb1 | 585 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 586 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
5a1fb391 AD |
587 | #ifdef CONFIG_NET_NS |
588 | ct->ct_net = net; | |
589 | #endif | |
9fb9cbb1 | 590 | |
941297f4 ED |
591 | /* |
592 | * changes to lookup keys must be done before setting refcnt to 1 | |
593 | */ | |
594 | smp_wmb(); | |
595 | atomic_set(&ct->ct_general.use, 1); | |
c88130bc | 596 | return ct; |
9fb9cbb1 | 597 | } |
13b18339 | 598 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 599 | |
c88130bc | 600 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 601 | { |
1d45209d ED |
602 | struct net *net = nf_ct_net(ct); |
603 | ||
ceeff754 | 604 | nf_ct_ext_destroy(ct); |
1d45209d | 605 | atomic_dec(&net->ct.count); |
ea781f19 ED |
606 | nf_ct_ext_free(ct); |
607 | kmem_cache_free(nf_conntrack_cachep, ct); | |
76507f69 | 608 | } |
13b18339 | 609 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 YK |
610 | |
611 | /* Allocate a new conntrack: we return -ENOMEM if classification | |
612 | failed due to stress. Otherwise it really is unclassifiable. */ | |
613 | static struct nf_conntrack_tuple_hash * | |
5a1fb391 AD |
614 | init_conntrack(struct net *net, |
615 | const struct nf_conntrack_tuple *tuple, | |
9fb9cbb1 | 616 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 617 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
618 | struct sk_buff *skb, |
619 | unsigned int dataoff) | |
620 | { | |
c88130bc | 621 | struct nf_conn *ct; |
3c158f7f | 622 | struct nf_conn_help *help; |
9fb9cbb1 YK |
623 | struct nf_conntrack_tuple repl_tuple; |
624 | struct nf_conntrack_expect *exp; | |
625 | ||
605dcad6 | 626 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 627 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
628 | return NULL; |
629 | } | |
630 | ||
5a1fb391 | 631 | ct = nf_conntrack_alloc(net, tuple, &repl_tuple, GFP_ATOMIC); |
cd7fcbf1 | 632 | if (IS_ERR(ct)) { |
0d53778e | 633 | pr_debug("Can't allocate conntrack.\n"); |
c88130bc | 634 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 YK |
635 | } |
636 | ||
c88130bc PM |
637 | if (!l4proto->new(ct, skb, dataoff)) { |
638 | nf_conntrack_free(ct); | |
0d53778e | 639 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
640 | return NULL; |
641 | } | |
642 | ||
58401572 | 643 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a0891aa6 | 644 | nf_ct_ecache_ext_add(ct, GFP_ATOMIC); |
58401572 | 645 | |
f8ba1aff | 646 | spin_lock_bh(&nf_conntrack_lock); |
9b03f38d | 647 | exp = nf_ct_find_expectation(net, tuple); |
9fb9cbb1 | 648 | if (exp) { |
0d53778e | 649 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 650 | ct, exp); |
9fb9cbb1 | 651 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
652 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
653 | ct->master = exp->master; | |
ceceae1b | 654 | if (exp->helper) { |
c88130bc | 655 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ceceae1b YK |
656 | if (help) |
657 | rcu_assign_pointer(help->helper, exp->helper); | |
ceceae1b YK |
658 | } |
659 | ||
9fb9cbb1 | 660 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 661 | ct->mark = exp->master->mark; |
7c9728c3 JM |
662 | #endif |
663 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 664 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 665 | #endif |
c88130bc | 666 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 667 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 668 | } else { |
226c0c0e | 669 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
0d55af87 | 670 | NF_CT_STAT_INC(net, new); |
22e7410b | 671 | } |
9fb9cbb1 YK |
672 | |
673 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 674 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 675 | &net->ct.unconfirmed); |
9fb9cbb1 | 676 | |
f8ba1aff | 677 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
678 | |
679 | if (exp) { | |
680 | if (exp->expectfn) | |
c88130bc | 681 | exp->expectfn(ct, exp); |
6823645d | 682 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
683 | } |
684 | ||
c88130bc | 685 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
686 | } |
687 | ||
688 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
689 | static inline struct nf_conn * | |
a702a65f AD |
690 | resolve_normal_ct(struct net *net, |
691 | struct sk_buff *skb, | |
9fb9cbb1 YK |
692 | unsigned int dataoff, |
693 | u_int16_t l3num, | |
694 | u_int8_t protonum, | |
695 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 696 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
697 | int *set_reply, |
698 | enum ip_conntrack_info *ctinfo) | |
699 | { | |
700 | struct nf_conntrack_tuple tuple; | |
701 | struct nf_conntrack_tuple_hash *h; | |
702 | struct nf_conn *ct; | |
703 | ||
bbe735e4 | 704 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 705 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 706 | l4proto)) { |
0d53778e | 707 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
708 | return NULL; |
709 | } | |
710 | ||
711 | /* look for tuple match */ | |
a702a65f | 712 | h = nf_conntrack_find_get(net, &tuple); |
9fb9cbb1 | 713 | if (!h) { |
a702a65f | 714 | h = init_conntrack(net, &tuple, l3proto, l4proto, skb, dataoff); |
9fb9cbb1 YK |
715 | if (!h) |
716 | return NULL; | |
717 | if (IS_ERR(h)) | |
718 | return (void *)h; | |
719 | } | |
720 | ct = nf_ct_tuplehash_to_ctrack(h); | |
721 | ||
722 | /* It exists; we have (non-exclusive) reference. */ | |
723 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
724 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; | |
725 | /* Please set reply bit if this packet OK */ | |
726 | *set_reply = 1; | |
727 | } else { | |
728 | /* Once we've had two way comms, always ESTABLISHED. */ | |
729 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 730 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
731 | *ctinfo = IP_CT_ESTABLISHED; |
732 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
733 | pr_debug("nf_conntrack_in: related packet for %p\n", |
734 | ct); | |
9fb9cbb1 YK |
735 | *ctinfo = IP_CT_RELATED; |
736 | } else { | |
0d53778e | 737 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
738 | *ctinfo = IP_CT_NEW; |
739 | } | |
740 | *set_reply = 0; | |
741 | } | |
742 | skb->nfct = &ct->ct_general; | |
743 | skb->nfctinfo = *ctinfo; | |
744 | return ct; | |
745 | } | |
746 | ||
747 | unsigned int | |
a702a65f AD |
748 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
749 | struct sk_buff *skb) | |
9fb9cbb1 YK |
750 | { |
751 | struct nf_conn *ct; | |
752 | enum ip_conntrack_info ctinfo; | |
753 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 754 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 YK |
755 | unsigned int dataoff; |
756 | u_int8_t protonum; | |
757 | int set_reply = 0; | |
758 | int ret; | |
759 | ||
760 | /* Previously seen (loopback or untracked)? Ignore. */ | |
3db05fea | 761 | if (skb->nfct) { |
0d55af87 | 762 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
9fb9cbb1 YK |
763 | return NF_ACCEPT; |
764 | } | |
765 | ||
923f4902 | 766 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 767 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 768 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
769 | &dataoff, &protonum); |
770 | if (ret <= 0) { | |
0d53778e | 771 | pr_debug("not prepared to track yet or error occured\n"); |
0d55af87 AD |
772 | NF_CT_STAT_INC_ATOMIC(net, error); |
773 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
9fb9cbb1 YK |
774 | return -ret; |
775 | } | |
776 | ||
76108cea | 777 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
778 | |
779 | /* It may be an special packet, error, unclean... | |
780 | * inverse of the return code tells to the netfilter | |
781 | * core what to do with the packet. */ | |
74c51a14 AD |
782 | if (l4proto->error != NULL) { |
783 | ret = l4proto->error(net, skb, dataoff, &ctinfo, pf, hooknum); | |
784 | if (ret <= 0) { | |
0d55af87 AD |
785 | NF_CT_STAT_INC_ATOMIC(net, error); |
786 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
74c51a14 AD |
787 | return -ret; |
788 | } | |
9fb9cbb1 YK |
789 | } |
790 | ||
a702a65f AD |
791 | ct = resolve_normal_ct(net, skb, dataoff, pf, protonum, |
792 | l3proto, l4proto, &set_reply, &ctinfo); | |
9fb9cbb1 YK |
793 | if (!ct) { |
794 | /* Not valid part of a connection */ | |
0d55af87 | 795 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
9fb9cbb1 YK |
796 | return NF_ACCEPT; |
797 | } | |
798 | ||
799 | if (IS_ERR(ct)) { | |
800 | /* Too stressed to deal. */ | |
0d55af87 | 801 | NF_CT_STAT_INC_ATOMIC(net, drop); |
9fb9cbb1 YK |
802 | return NF_DROP; |
803 | } | |
804 | ||
3db05fea | 805 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 806 | |
3db05fea | 807 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
ec8d5409 | 808 | if (ret <= 0) { |
9fb9cbb1 YK |
809 | /* Invalid: inverse of the return code tells |
810 | * the netfilter core what to do */ | |
0d53778e | 811 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
812 | nf_conntrack_put(skb->nfct); |
813 | skb->nfct = NULL; | |
0d55af87 | 814 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
815 | if (ret == -NF_DROP) |
816 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
9fb9cbb1 YK |
817 | return -ret; |
818 | } | |
819 | ||
820 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
a71996fc | 821 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 YK |
822 | |
823 | return ret; | |
824 | } | |
13b18339 | 825 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 826 | |
5f2b4c90 JE |
827 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
828 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 829 | { |
5f2b4c90 | 830 | bool ret; |
923f4902 PM |
831 | |
832 | rcu_read_lock(); | |
833 | ret = nf_ct_invert_tuple(inverse, orig, | |
834 | __nf_ct_l3proto_find(orig->src.l3num), | |
835 | __nf_ct_l4proto_find(orig->src.l3num, | |
836 | orig->dst.protonum)); | |
837 | rcu_read_unlock(); | |
838 | return ret; | |
9fb9cbb1 | 839 | } |
13b18339 | 840 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 841 | |
5b1158e9 JK |
842 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
843 | implicitly racy: see __nf_conntrack_confirm */ | |
844 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
845 | const struct nf_conntrack_tuple *newreply) | |
846 | { | |
847 | struct nf_conn_help *help = nfct_help(ct); | |
848 | ||
5b1158e9 JK |
849 | /* Should be unconfirmed, so not in hash table yet */ |
850 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
851 | ||
0d53778e | 852 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 853 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
854 | |
855 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 856 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 857 | return; |
ceceae1b | 858 | |
c52fbb41 | 859 | rcu_read_lock(); |
226c0c0e | 860 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
c52fbb41 | 861 | rcu_read_unlock(); |
5b1158e9 | 862 | } |
13b18339 | 863 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 864 | |
9fb9cbb1 YK |
865 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
866 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
867 | enum ip_conntrack_info ctinfo, | |
868 | const struct sk_buff *skb, | |
869 | unsigned long extra_jiffies, | |
870 | int do_acct) | |
871 | { | |
9fb9cbb1 YK |
872 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
873 | NF_CT_ASSERT(skb); | |
874 | ||
997ae831 | 875 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
876 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
877 | goto acct; | |
997ae831 | 878 | |
9fb9cbb1 YK |
879 | /* If not in hash table, timer will not be active yet */ |
880 | if (!nf_ct_is_confirmed(ct)) { | |
881 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 882 | } else { |
be00c8e4 MJ |
883 | unsigned long newtime = jiffies + extra_jiffies; |
884 | ||
885 | /* Only update the timeout if the new timeout is at least | |
886 | HZ jiffies from the old timeout. Need del_timer for race | |
887 | avoidance (may already be dying). */ | |
65cb9fda PM |
888 | if (newtime - ct->timeout.expires >= HZ) |
889 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
890 | } |
891 | ||
47d95045 | 892 | acct: |
9fb9cbb1 | 893 | if (do_acct) { |
58401572 | 894 | struct nf_conn_counter *acct; |
3ffd5eeb | 895 | |
58401572 KPO |
896 | acct = nf_conn_acct_find(ct); |
897 | if (acct) { | |
65cb9fda | 898 | spin_lock_bh(&ct->lock); |
58401572 KPO |
899 | acct[CTINFO2DIR(ctinfo)].packets++; |
900 | acct[CTINFO2DIR(ctinfo)].bytes += | |
901 | skb->len - skb_network_offset(skb); | |
65cb9fda | 902 | spin_unlock_bh(&ct->lock); |
58401572 | 903 | } |
9fb9cbb1 | 904 | } |
9fb9cbb1 | 905 | } |
13b18339 | 906 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 907 | |
4c889498 DM |
908 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
909 | enum ip_conntrack_info ctinfo, | |
910 | const struct sk_buff *skb, | |
911 | int do_acct) | |
51091764 | 912 | { |
718d4ad9 | 913 | if (do_acct) { |
58401572 KPO |
914 | struct nf_conn_counter *acct; |
915 | ||
58401572 KPO |
916 | acct = nf_conn_acct_find(ct); |
917 | if (acct) { | |
65cb9fda | 918 | spin_lock_bh(&ct->lock); |
58401572 KPO |
919 | acct[CTINFO2DIR(ctinfo)].packets++; |
920 | acct[CTINFO2DIR(ctinfo)].bytes += | |
921 | skb->len - skb_network_offset(skb); | |
65cb9fda | 922 | spin_unlock_bh(&ct->lock); |
58401572 | 923 | } |
718d4ad9 | 924 | } |
58401572 | 925 | |
4c889498 | 926 | if (del_timer(&ct->timeout)) { |
51091764 | 927 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
928 | return true; |
929 | } | |
930 | return false; | |
51091764 | 931 | } |
718d4ad9 | 932 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 933 | |
e281db5c | 934 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
935 | |
936 | #include <linux/netfilter/nfnetlink.h> | |
937 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
938 | #include <linux/mutex.h> |
939 | ||
c1d10adb PNA |
940 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
941 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
942 | * or depend on ctnetlink */ | |
fdf70832 | 943 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
944 | const struct nf_conntrack_tuple *tuple) |
945 | { | |
77236b6e PM |
946 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
947 | NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); | |
c1d10adb PNA |
948 | return 0; |
949 | ||
df6fb868 | 950 | nla_put_failure: |
c1d10adb PNA |
951 | return -1; |
952 | } | |
fdf70832 | 953 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 954 | |
f73e924c PM |
955 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
956 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
957 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 958 | }; |
f73e924c | 959 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 960 | |
fdf70832 | 961 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
962 | struct nf_conntrack_tuple *t) |
963 | { | |
df6fb868 | 964 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
965 | return -EINVAL; |
966 | ||
77236b6e PM |
967 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
968 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
969 | |
970 | return 0; | |
971 | } | |
fdf70832 | 972 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
973 | |
974 | int nf_ct_port_nlattr_tuple_size(void) | |
975 | { | |
976 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
977 | } | |
978 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
979 | #endif |
980 | ||
9fb9cbb1 | 981 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc | 982 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb1 YK |
983 | { |
984 | struct nf_conn *ct; | |
985 | enum ip_conntrack_info ctinfo; | |
986 | ||
987 | /* This ICMP is in reverse direction to the packet which caused it */ | |
988 | ct = nf_ct_get(skb, &ctinfo); | |
989 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
990 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; | |
991 | else | |
992 | ctinfo = IP_CT_RELATED; | |
993 | ||
994 | /* Attach to new skbuff, and increment count */ | |
995 | nskb->nfct = &ct->ct_general; | |
996 | nskb->nfctinfo = ctinfo; | |
997 | nf_conntrack_get(nskb->nfct); | |
998 | } | |
999 | ||
9fb9cbb1 | 1000 | /* Bring out ya dead! */ |
df0933dc | 1001 | static struct nf_conn * |
400dad39 | 1002 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1003 | void *data, unsigned int *bucket) |
1004 | { | |
df0933dc PM |
1005 | struct nf_conntrack_tuple_hash *h; |
1006 | struct nf_conn *ct; | |
ea781f19 | 1007 | struct hlist_nulls_node *n; |
9fb9cbb1 | 1008 | |
f8ba1aff | 1009 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1010 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
ea781f19 | 1011 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
df0933dc PM |
1012 | ct = nf_ct_tuplehash_to_ctrack(h); |
1013 | if (iter(ct, data)) | |
1014 | goto found; | |
1015 | } | |
601e68e1 | 1016 | } |
ea781f19 | 1017 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
1018 | ct = nf_ct_tuplehash_to_ctrack(h); |
1019 | if (iter(ct, data)) | |
ec68e97d | 1020 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 1021 | } |
f8ba1aff | 1022 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
1023 | return NULL; |
1024 | found: | |
c073e3fa | 1025 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1026 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1027 | return ct; |
9fb9cbb1 YK |
1028 | } |
1029 | ||
400dad39 AD |
1030 | void nf_ct_iterate_cleanup(struct net *net, |
1031 | int (*iter)(struct nf_conn *i, void *data), | |
1032 | void *data) | |
9fb9cbb1 | 1033 | { |
df0933dc | 1034 | struct nf_conn *ct; |
9fb9cbb1 YK |
1035 | unsigned int bucket = 0; |
1036 | ||
400dad39 | 1037 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1038 | /* Time to push up daises... */ |
1039 | if (del_timer(&ct->timeout)) | |
1040 | death_by_timeout((unsigned long)ct); | |
1041 | /* ... else the timer will get him soon. */ | |
1042 | ||
1043 | nf_ct_put(ct); | |
1044 | } | |
1045 | } | |
13b18339 | 1046 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1047 | |
19abb7b0 PNA |
1048 | struct __nf_ct_flush_report { |
1049 | u32 pid; | |
1050 | int report; | |
1051 | }; | |
1052 | ||
274d383b | 1053 | static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb1 | 1054 | { |
19abb7b0 PNA |
1055 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
1056 | ||
dd7669a9 PNA |
1057 | /* If we fail to deliver the event, death_by_timeout() will retry */ |
1058 | if (nf_conntrack_event_report(IPCT_DESTROY, i, | |
1059 | fr->pid, fr->report) < 0) | |
1060 | return 1; | |
1061 | ||
1062 | /* Avoid the delivery of the destroy event in death_by_timeout(). */ | |
1063 | set_bit(IPS_DYING_BIT, &i->status); | |
9fb9cbb1 YK |
1064 | return 1; |
1065 | } | |
1066 | ||
274d383b PNA |
1067 | static int kill_all(struct nf_conn *i, void *data) |
1068 | { | |
1069 | return 1; | |
1070 | } | |
1071 | ||
ea781f19 | 1072 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
9fb9cbb1 YK |
1073 | { |
1074 | if (vmalloced) | |
1075 | vfree(hash); | |
1076 | else | |
601e68e1 | 1077 | free_pages((unsigned long)hash, |
f205c5e0 | 1078 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1079 | } |
ac565e5f | 1080 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1081 | |
274d383b | 1082 | void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
c1d10adb | 1083 | { |
19abb7b0 PNA |
1084 | struct __nf_ct_flush_report fr = { |
1085 | .pid = pid, | |
1086 | .report = report, | |
1087 | }; | |
274d383b | 1088 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb | 1089 | } |
274d383b | 1090 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1091 | |
ee254fa4 | 1092 | static void nf_ct_release_dying_list(struct net *net) |
dd7669a9 PNA |
1093 | { |
1094 | struct nf_conntrack_tuple_hash *h; | |
1095 | struct nf_conn *ct; | |
1096 | struct hlist_nulls_node *n; | |
1097 | ||
1098 | spin_lock_bh(&nf_conntrack_lock); | |
ee254fa4 | 1099 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a9 PNA |
1100 | ct = nf_ct_tuplehash_to_ctrack(h); |
1101 | /* never fails to remove them, no listeners at this point */ | |
1102 | nf_ct_kill(ct); | |
1103 | } | |
1104 | spin_unlock_bh(&nf_conntrack_lock); | |
1105 | } | |
1106 | ||
08f6547d | 1107 | static void nf_conntrack_cleanup_init_net(void) |
9fb9cbb1 | 1108 | { |
08f6547d AD |
1109 | nf_conntrack_helper_fini(); |
1110 | nf_conntrack_proto_fini(); | |
1111 | kmem_cache_destroy(nf_conntrack_cachep); | |
1112 | } | |
9fb9cbb1 | 1113 | |
08f6547d AD |
1114 | static void nf_conntrack_cleanup_net(struct net *net) |
1115 | { | |
9fb9cbb1 | 1116 | i_see_dead_people: |
274d383b | 1117 | nf_ct_iterate_cleanup(net, kill_all, NULL); |
ee254fa4 | 1118 | nf_ct_release_dying_list(net); |
49ac8713 | 1119 | if (atomic_read(&net->ct.count) != 0) { |
9fb9cbb1 YK |
1120 | schedule(); |
1121 | goto i_see_dead_people; | |
1122 | } | |
6636568c PM |
1123 | /* wait until all references to nf_conntrack_untracked are dropped */ |
1124 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) | |
1125 | schedule(); | |
9fb9cbb1 | 1126 | |
400dad39 | 1127 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1128 | nf_conntrack_htable_size); |
a0891aa6 | 1129 | nf_conntrack_ecache_fini(net); |
d716a4df | 1130 | nf_conntrack_acct_fini(net); |
9b03f38d | 1131 | nf_conntrack_expect_fini(net); |
0d55af87 | 1132 | free_percpu(net->ct.stat); |
08f6547d AD |
1133 | } |
1134 | ||
1135 | /* Mishearing the voices in his head, our hero wonders how he's | |
1136 | supposed to kill the mall. */ | |
1137 | void nf_conntrack_cleanup(struct net *net) | |
1138 | { | |
1139 | if (net_eq(net, &init_net)) | |
1140 | rcu_assign_pointer(ip_ct_attach, NULL); | |
1141 | ||
1142 | /* This makes sure all current packets have passed through | |
1143 | netfilter framework. Roll on, two-stage module | |
1144 | delete... */ | |
1145 | synchronize_net(); | |
1146 | ||
1147 | nf_conntrack_cleanup_net(net); | |
1148 | ||
1149 | if (net_eq(net, &init_net)) { | |
1150 | rcu_assign_pointer(nf_ct_destroy, NULL); | |
1151 | nf_conntrack_cleanup_init_net(); | |
1152 | } | |
9fb9cbb1 YK |
1153 | } |
1154 | ||
ea781f19 | 1155 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
9fb9cbb1 | 1156 | { |
ea781f19 ED |
1157 | struct hlist_nulls_head *hash; |
1158 | unsigned int nr_slots, i; | |
1159 | size_t sz; | |
9fb9cbb1 | 1160 | |
601e68e1 | 1161 | *vmalloced = 0; |
8e5105a0 | 1162 | |
ea781f19 ED |
1163 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1164 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1165 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1166 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1167 | get_order(sz)); | |
601e68e1 | 1168 | if (!hash) { |
9fb9cbb1 YK |
1169 | *vmalloced = 1; |
1170 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); | |
ea781f19 | 1171 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
9fb9cbb1 YK |
1172 | } |
1173 | ||
ea781f19 ED |
1174 | if (hash && nulls) |
1175 | for (i = 0; i < nr_slots; i++) | |
1176 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1177 | |
1178 | return hash; | |
1179 | } | |
ac565e5f | 1180 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1181 | |
fae718dd | 1182 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1183 | { |
96eb24d7 SH |
1184 | int i, bucket, vmalloced, old_vmalloced; |
1185 | unsigned int hashsize, old_size; | |
9fb9cbb1 | 1186 | int rnd; |
ea781f19 | 1187 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 YK |
1188 | struct nf_conntrack_tuple_hash *h; |
1189 | ||
1190 | /* On boot, we can set this without any fancy locking. */ | |
1191 | if (!nf_conntrack_htable_size) | |
1192 | return param_set_uint(val, kp); | |
1193 | ||
96eb24d7 | 1194 | hashsize = simple_strtoul(val, NULL, 0); |
9fb9cbb1 YK |
1195 | if (!hashsize) |
1196 | return -EINVAL; | |
1197 | ||
ea781f19 | 1198 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
9fb9cbb1 YK |
1199 | if (!hash) |
1200 | return -ENOMEM; | |
1201 | ||
1202 | /* We have to rehahs for the new table anyway, so we also can | |
1203 | * use a newrandom seed */ | |
af07d241 | 1204 | get_random_bytes(&rnd, sizeof(rnd)); |
9fb9cbb1 | 1205 | |
76507f69 PM |
1206 | /* Lookups in the old hash might happen in parallel, which means we |
1207 | * might get false negatives during connection lookup. New connections | |
1208 | * created because of a false negative won't make it into the hash | |
1209 | * though since that required taking the lock. | |
1210 | */ | |
f8ba1aff | 1211 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1212 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
ea781f19 ED |
1213 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1214 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1215 | struct nf_conntrack_tuple_hash, hnnode); | |
1216 | hlist_nulls_del_rcu(&h->hnnode); | |
9fb9cbb1 | 1217 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
ea781f19 | 1218 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1219 | } |
1220 | } | |
1221 | old_size = nf_conntrack_htable_size; | |
400dad39 AD |
1222 | old_vmalloced = init_net.ct.hash_vmalloc; |
1223 | old_hash = init_net.ct.hash; | |
9fb9cbb1 YK |
1224 | |
1225 | nf_conntrack_htable_size = hashsize; | |
400dad39 AD |
1226 | init_net.ct.hash_vmalloc = vmalloced; |
1227 | init_net.ct.hash = hash; | |
9fb9cbb1 | 1228 | nf_conntrack_hash_rnd = rnd; |
f8ba1aff | 1229 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1230 | |
ac565e5f | 1231 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
9fb9cbb1 YK |
1232 | return 0; |
1233 | } | |
fae718dd | 1234 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1235 | |
fae718dd | 1236 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1237 | &nf_conntrack_htable_size, 0600); |
1238 | ||
08f6547d | 1239 | static int nf_conntrack_init_init_net(void) |
9fb9cbb1 | 1240 | { |
f205c5e0 | 1241 | int max_factor = 8; |
9fb9cbb1 YK |
1242 | int ret; |
1243 | ||
1244 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1245 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1246 | if (!nf_conntrack_htable_size) { |
1247 | nf_conntrack_htable_size | |
1248 | = (((num_physpages << PAGE_SHIFT) / 16384) | |
f205c5e0 | 1249 | / sizeof(struct hlist_head)); |
9fb9cbb1 | 1250 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1251 | nf_conntrack_htable_size = 16384; |
1252 | if (nf_conntrack_htable_size < 32) | |
1253 | nf_conntrack_htable_size = 32; | |
1254 | ||
1255 | /* Use a max. factor of four by default to get the same max as | |
1256 | * with the old struct list_heads. When a table size is given | |
1257 | * we use the old value of 8 to avoid reducing the max. | |
1258 | * entries. */ | |
1259 | max_factor = 4; | |
9fb9cbb1 | 1260 | } |
f205c5e0 | 1261 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 PM |
1262 | |
1263 | printk("nf_conntrack version %s (%u buckets, %d max)\n", | |
1264 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, | |
1265 | nf_conntrack_max); | |
1266 | ||
dacd2a1a YK |
1267 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
1268 | sizeof(struct nf_conn), | |
ea781f19 | 1269 | 0, SLAB_DESTROY_BY_RCU, NULL); |
dacd2a1a | 1270 | if (!nf_conntrack_cachep) { |
9fb9cbb1 | 1271 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
08f6547d AD |
1272 | ret = -ENOMEM; |
1273 | goto err_cache; | |
9fb9cbb1 YK |
1274 | } |
1275 | ||
e9c1b084 PM |
1276 | ret = nf_conntrack_proto_init(); |
1277 | if (ret < 0) | |
08f6547d | 1278 | goto err_proto; |
933a41e7 | 1279 | |
ceceae1b YK |
1280 | ret = nf_conntrack_helper_init(); |
1281 | if (ret < 0) | |
08f6547d AD |
1282 | goto err_helper; |
1283 | ||
1284 | return 0; | |
1285 | ||
1286 | err_helper: | |
1287 | nf_conntrack_proto_fini(); | |
1288 | err_proto: | |
1289 | kmem_cache_destroy(nf_conntrack_cachep); | |
1290 | err_cache: | |
1291 | return ret; | |
1292 | } | |
1293 | ||
8cc20198 ED |
1294 | /* |
1295 | * We need to use special "null" values, not used in hash table | |
1296 | */ | |
1297 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1298 | #define DYING_NULLS_VAL ((1<<30)+1) | |
1299 | ||
08f6547d AD |
1300 | static int nf_conntrack_init_net(struct net *net) |
1301 | { | |
1302 | int ret; | |
ceceae1b | 1303 | |
08f6547d | 1304 | atomic_set(&net->ct.count, 0); |
8cc20198 ED |
1305 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
1306 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); | |
08f6547d AD |
1307 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1308 | if (!net->ct.stat) { | |
1309 | ret = -ENOMEM; | |
1310 | goto err_stat; | |
1311 | } | |
08f6547d | 1312 | net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
ea781f19 | 1313 | &net->ct.hash_vmalloc, 1); |
08f6547d AD |
1314 | if (!net->ct.hash) { |
1315 | ret = -ENOMEM; | |
1316 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1317 | goto err_hash; | |
1318 | } | |
1319 | ret = nf_conntrack_expect_init(net); | |
1320 | if (ret < 0) | |
1321 | goto err_expect; | |
d716a4df | 1322 | ret = nf_conntrack_acct_init(net); |
58401572 | 1323 | if (ret < 0) |
08f6547d | 1324 | goto err_acct; |
a0891aa6 PNA |
1325 | ret = nf_conntrack_ecache_init(net); |
1326 | if (ret < 0) | |
1327 | goto err_ecache; | |
7d3cdc6b | 1328 | |
9fb9cbb1 YK |
1329 | /* Set up fake conntrack: |
1330 | - to never be deleted, not in any hashes */ | |
5a1fb391 AD |
1331 | #ifdef CONFIG_NET_NS |
1332 | nf_conntrack_untracked.ct_net = &init_net; | |
1333 | #endif | |
9fb9cbb1 YK |
1334 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
1335 | /* - and look it like as a confirmed connection */ | |
1336 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); | |
1337 | ||
08f6547d | 1338 | return 0; |
9fb9cbb1 | 1339 | |
a0891aa6 PNA |
1340 | err_ecache: |
1341 | nf_conntrack_acct_fini(net); | |
08f6547d | 1342 | err_acct: |
9b03f38d | 1343 | nf_conntrack_expect_fini(net); |
08f6547d | 1344 | err_expect: |
400dad39 | 1345 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
ac565e5f | 1346 | nf_conntrack_htable_size); |
6058fa6b | 1347 | err_hash: |
0d55af87 AD |
1348 | free_percpu(net->ct.stat); |
1349 | err_stat: | |
08f6547d AD |
1350 | return ret; |
1351 | } | |
1352 | ||
1353 | int nf_conntrack_init(struct net *net) | |
1354 | { | |
1355 | int ret; | |
1356 | ||
1357 | if (net_eq(net, &init_net)) { | |
1358 | ret = nf_conntrack_init_init_net(); | |
1359 | if (ret < 0) | |
1360 | goto out_init_net; | |
1361 | } | |
1362 | ret = nf_conntrack_init_net(net); | |
1363 | if (ret < 0) | |
1364 | goto out_net; | |
1365 | ||
1366 | if (net_eq(net, &init_net)) { | |
1367 | /* For use by REJECT target */ | |
1368 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); | |
1369 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); | |
1370 | } | |
1371 | return 0; | |
1372 | ||
1373 | out_net: | |
1374 | if (net_eq(net, &init_net)) | |
1375 | nf_conntrack_cleanup_init_net(); | |
1376 | out_init_net: | |
1377 | return ret; | |
9fb9cbb1 | 1378 | } |