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Commit | Line | Data |
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9fb9cbb1 YK |
1 | /* Connection state tracking for netfilter. This is separated from, |
2 | but required by, the NAT layer; it can also be used by an iptables | |
3 | extension. */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
dc808fe2 | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
9fb9cbb1 YK |
7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
12 | */ |
13 | ||
9fb9cbb1 YK |
14 | #include <linux/types.h> |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/module.h> | |
d43c36dc | 17 | #include <linux/sched.h> |
9fb9cbb1 YK |
18 | #include <linux/skbuff.h> |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/random.h> | |
24 | #include <linux/jhash.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/percpu.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/notifier.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/socket.h> | |
d7fe0f24 | 32 | #include <linux/mm.h> |
d696c7bd | 33 | #include <linux/nsproxy.h> |
ea781f19 | 34 | #include <linux/rculist_nulls.h> |
9fb9cbb1 | 35 | |
9fb9cbb1 YK |
36 | #include <net/netfilter/nf_conntrack.h> |
37 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 38 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 39 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 YK |
40 | #include <net/netfilter/nf_conntrack_helper.h> |
41 | #include <net/netfilter/nf_conntrack_core.h> | |
ecfab2c9 | 42 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 43 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 44 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 45 | #include <net/netfilter/nf_conntrack_zones.h> |
e6a7d3c0 | 46 | #include <net/netfilter/nf_nat.h> |
e17b666a | 47 | #include <net/netfilter/nf_nat_core.h> |
9fb9cbb1 | 48 | |
dc808fe2 | 49 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 50 | |
e17b666a PM |
51 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
52 | enum nf_nat_manip_type manip, | |
39938324 | 53 | const struct nlattr *attr) __read_mostly; |
e6a7d3c0 PNA |
54 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
55 | ||
f8ba1aff | 56 | DEFINE_SPINLOCK(nf_conntrack_lock); |
13b18339 | 57 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
9fb9cbb1 | 58 | |
e2b7606c | 59 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
60 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
61 | ||
e478075c | 62 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 63 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 64 | |
b3c5163f ED |
65 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
66 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 67 | |
9fb9cbb1 YK |
68 | static int nf_conntrack_hash_rnd_initted; |
69 | static unsigned int nf_conntrack_hash_rnd; | |
70 | ||
71 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, | |
5d0aa2cc | 72 | u16 zone, unsigned int size, unsigned int rnd) |
9fb9cbb1 | 73 | { |
0794935e PM |
74 | unsigned int n; |
75 | u_int32_t h; | |
76 | ||
77 | /* The direction must be ignored, so we hash everything up to the | |
78 | * destination ports (which is a multiple of 4) and treat the last | |
79 | * three bytes manually. | |
80 | */ | |
81 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); | |
82 | h = jhash2((u32 *)tuple, n, | |
5d0aa2cc PM |
83 | zone ^ rnd ^ (((__force __u16)tuple->dst.u.all << 16) | |
84 | tuple->dst.protonum)); | |
0794935e PM |
85 | |
86 | return ((u64)h * size) >> 32; | |
9fb9cbb1 YK |
87 | } |
88 | ||
5d0aa2cc | 89 | static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
d696c7bd | 90 | const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 91 | { |
5d0aa2cc | 92 | return __hash_conntrack(tuple, zone, net->ct.htable_size, |
9fb9cbb1 YK |
93 | nf_conntrack_hash_rnd); |
94 | } | |
95 | ||
5f2b4c90 | 96 | bool |
9fb9cbb1 YK |
97 | nf_ct_get_tuple(const struct sk_buff *skb, |
98 | unsigned int nhoff, | |
99 | unsigned int dataoff, | |
100 | u_int16_t l3num, | |
101 | u_int8_t protonum, | |
102 | struct nf_conntrack_tuple *tuple, | |
103 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 104 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 105 | { |
443a70d5 | 106 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
107 | |
108 | tuple->src.l3num = l3num; | |
109 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 110 | return false; |
9fb9cbb1 YK |
111 | |
112 | tuple->dst.protonum = protonum; | |
113 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
114 | ||
605dcad6 | 115 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
9fb9cbb1 | 116 | } |
13b18339 | 117 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 118 | |
5f2b4c90 JE |
119 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
120 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
121 | { |
122 | struct nf_conntrack_l3proto *l3proto; | |
123 | struct nf_conntrack_l4proto *l4proto; | |
124 | unsigned int protoff; | |
125 | u_int8_t protonum; | |
126 | int ret; | |
127 | ||
128 | rcu_read_lock(); | |
129 | ||
130 | l3proto = __nf_ct_l3proto_find(l3num); | |
131 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
132 | if (ret != NF_ACCEPT) { | |
133 | rcu_read_unlock(); | |
5f2b4c90 | 134 | return false; |
e2a3123f YK |
135 | } |
136 | ||
137 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
138 | ||
139 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, | |
140 | l3proto, l4proto); | |
141 | ||
142 | rcu_read_unlock(); | |
143 | return ret; | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
146 | ||
5f2b4c90 | 147 | bool |
9fb9cbb1 YK |
148 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
149 | const struct nf_conntrack_tuple *orig, | |
150 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 151 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 152 | { |
443a70d5 | 153 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
154 | |
155 | inverse->src.l3num = orig->src.l3num; | |
156 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 157 | return false; |
9fb9cbb1 YK |
158 | |
159 | inverse->dst.dir = !orig->dst.dir; | |
160 | ||
161 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 162 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 163 | } |
13b18339 | 164 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 165 | |
9fb9cbb1 YK |
166 | static void |
167 | clean_from_lists(struct nf_conn *ct) | |
168 | { | |
0d53778e | 169 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
170 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
171 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
172 | |
173 | /* Destroy all pending expectations */ | |
c1d10adb | 174 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
175 | } |
176 | ||
177 | static void | |
178 | destroy_conntrack(struct nf_conntrack *nfct) | |
179 | { | |
180 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 181 | struct net *net = nf_ct_net(ct); |
605dcad6 | 182 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 183 | |
0d53778e | 184 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 YK |
185 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
186 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
187 | ||
9fb9cbb1 YK |
188 | /* To make sure we don't get any weird locking issues here: |
189 | * destroy_conntrack() MUST NOT be called with a write lock | |
190 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 191 | rcu_read_lock(); |
5e8fbe2a | 192 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
193 | if (l4proto && l4proto->destroy) |
194 | l4proto->destroy(ct); | |
9fb9cbb1 | 195 | |
982d9a9c | 196 | rcu_read_unlock(); |
9fb9cbb1 | 197 | |
f8ba1aff | 198 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
199 | /* Expectations will have been removed in clean_from_lists, |
200 | * except TFTP can create an expectation on the first packet, | |
201 | * before connection is in the list, so we need to clean here, | |
202 | * too. */ | |
c1d10adb | 203 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
204 | |
205 | /* We overload first tuple to link into unconfirmed list. */ | |
206 | if (!nf_ct_is_confirmed(ct)) { | |
ea781f19 ED |
207 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
208 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 YK |
209 | } |
210 | ||
0d55af87 | 211 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 212 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
213 | |
214 | if (ct->master) | |
215 | nf_ct_put(ct->master); | |
216 | ||
0d53778e | 217 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
218 | nf_conntrack_free(ct); |
219 | } | |
220 | ||
dd7669a9 | 221 | void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 222 | { |
0d55af87 | 223 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 | 224 | |
9858a3ae | 225 | nf_ct_helper_destroy(ct); |
f8ba1aff | 226 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
227 | /* Inside lock so preempt is disabled on module removal path. |
228 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 229 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 230 | clean_from_lists(ct); |
f8ba1aff | 231 | spin_unlock_bh(&nf_conntrack_lock); |
dd7669a9 PNA |
232 | } |
233 | EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); | |
234 | ||
235 | static void death_by_event(unsigned long ul_conntrack) | |
236 | { | |
237 | struct nf_conn *ct = (void *)ul_conntrack; | |
238 | struct net *net = nf_ct_net(ct); | |
239 | ||
240 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { | |
241 | /* bad luck, let's retry again */ | |
242 | ct->timeout.expires = jiffies + | |
243 | (random32() % net->ct.sysctl_events_retry_timeout); | |
244 | add_timer(&ct->timeout); | |
245 | return; | |
246 | } | |
247 | /* we've got the event delivered, now it's dying */ | |
248 | set_bit(IPS_DYING_BIT, &ct->status); | |
249 | spin_lock(&nf_conntrack_lock); | |
250 | hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
251 | spin_unlock(&nf_conntrack_lock); | |
252 | nf_ct_put(ct); | |
253 | } | |
254 | ||
255 | void nf_ct_insert_dying_list(struct nf_conn *ct) | |
256 | { | |
257 | struct net *net = nf_ct_net(ct); | |
258 | ||
259 | /* add this conntrack to the dying list */ | |
260 | spin_lock_bh(&nf_conntrack_lock); | |
261 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
262 | &net->ct.dying); | |
263 | spin_unlock_bh(&nf_conntrack_lock); | |
264 | /* set a new timer to retry event delivery */ | |
265 | setup_timer(&ct->timeout, death_by_event, (unsigned long)ct); | |
266 | ct->timeout.expires = jiffies + | |
267 | (random32() % net->ct.sysctl_events_retry_timeout); | |
268 | add_timer(&ct->timeout); | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list); | |
271 | ||
272 | static void death_by_timeout(unsigned long ul_conntrack) | |
273 | { | |
274 | struct nf_conn *ct = (void *)ul_conntrack; | |
275 | ||
276 | if (!test_bit(IPS_DYING_BIT, &ct->status) && | |
277 | unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { | |
278 | /* destroy event was not delivered */ | |
279 | nf_ct_delete_from_lists(ct); | |
280 | nf_ct_insert_dying_list(ct); | |
281 | return; | |
282 | } | |
283 | set_bit(IPS_DYING_BIT, &ct->status); | |
284 | nf_ct_delete_from_lists(ct); | |
9fb9cbb1 YK |
285 | nf_ct_put(ct); |
286 | } | |
287 | ||
ea781f19 ED |
288 | /* |
289 | * Warning : | |
290 | * - Caller must take a reference on returned object | |
291 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
292 | * OR | |
293 | * - Caller must lock nf_conntrack_lock before calling this function | |
294 | */ | |
c1d10adb | 295 | struct nf_conntrack_tuple_hash * |
5d0aa2cc PM |
296 | __nf_conntrack_find(struct net *net, u16 zone, |
297 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 YK |
298 | { |
299 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 300 | struct hlist_nulls_node *n; |
5d0aa2cc | 301 | unsigned int hash = hash_conntrack(net, zone, tuple); |
9fb9cbb1 | 302 | |
4e29e9ec PM |
303 | /* Disable BHs the entire time since we normally need to disable them |
304 | * at least once for the stats anyway. | |
305 | */ | |
306 | local_bh_disable(); | |
ea781f19 ED |
307 | begin: |
308 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { | |
5d0aa2cc PM |
309 | if (nf_ct_tuple_equal(tuple, &h->tuple) && |
310 | nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { | |
0d55af87 | 311 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 312 | local_bh_enable(); |
9fb9cbb1 YK |
313 | return h; |
314 | } | |
0d55af87 | 315 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 316 | } |
ea781f19 ED |
317 | /* |
318 | * if the nulls value we got at the end of this lookup is | |
319 | * not the expected one, we must restart lookup. | |
320 | * We probably met an item that was moved to another chain. | |
321 | */ | |
af740b2c JDB |
322 | if (get_nulls_value(n) != hash) { |
323 | NF_CT_STAT_INC(net, search_restart); | |
ea781f19 | 324 | goto begin; |
af740b2c | 325 | } |
4e29e9ec | 326 | local_bh_enable(); |
9fb9cbb1 YK |
327 | |
328 | return NULL; | |
329 | } | |
13b18339 | 330 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
331 | |
332 | /* Find a connection corresponding to a tuple. */ | |
333 | struct nf_conntrack_tuple_hash * | |
5d0aa2cc PM |
334 | nf_conntrack_find_get(struct net *net, u16 zone, |
335 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 YK |
336 | { |
337 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 338 | struct nf_conn *ct; |
9fb9cbb1 | 339 | |
76507f69 | 340 | rcu_read_lock(); |
ea781f19 | 341 | begin: |
5d0aa2cc | 342 | h = __nf_conntrack_find(net, zone, tuple); |
76507f69 PM |
343 | if (h) { |
344 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
345 | if (unlikely(nf_ct_is_dying(ct) || |
346 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 347 | h = NULL; |
ea781f19 | 348 | else { |
5d0aa2cc PM |
349 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || |
350 | nf_ct_zone(ct) != zone)) { | |
ea781f19 ED |
351 | nf_ct_put(ct); |
352 | goto begin; | |
353 | } | |
354 | } | |
76507f69 PM |
355 | } |
356 | rcu_read_unlock(); | |
9fb9cbb1 YK |
357 | |
358 | return h; | |
359 | } | |
13b18339 | 360 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 361 | |
c1d10adb PNA |
362 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
363 | unsigned int hash, | |
601e68e1 | 364 | unsigned int repl_hash) |
c1d10adb | 365 | { |
400dad39 AD |
366 | struct net *net = nf_ct_net(ct); |
367 | ||
ea781f19 | 368 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 369 | &net->ct.hash[hash]); |
ea781f19 | 370 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 371 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
372 | } |
373 | ||
374 | void nf_conntrack_hash_insert(struct nf_conn *ct) | |
375 | { | |
d696c7bd | 376 | struct net *net = nf_ct_net(ct); |
c1d10adb | 377 | unsigned int hash, repl_hash; |
5d0aa2cc | 378 | u16 zone; |
c1d10adb | 379 | |
5d0aa2cc PM |
380 | zone = nf_ct_zone(ct); |
381 | hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
382 | repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
c1d10adb | 383 | |
c1d10adb | 384 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
c1d10adb | 385 | } |
13b18339 | 386 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
c1d10adb | 387 | |
9fb9cbb1 YK |
388 | /* Confirm a connection given skb; places it in hash table */ |
389 | int | |
3db05fea | 390 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
391 | { |
392 | unsigned int hash, repl_hash; | |
df0933dc | 393 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 394 | struct nf_conn *ct; |
df0933dc | 395 | struct nf_conn_help *help; |
ea781f19 | 396 | struct hlist_nulls_node *n; |
9fb9cbb1 | 397 | enum ip_conntrack_info ctinfo; |
400dad39 | 398 | struct net *net; |
5d0aa2cc | 399 | u16 zone; |
9fb9cbb1 | 400 | |
3db05fea | 401 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 402 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
403 | |
404 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
405 | ICMP/TCP RST packets in other direction. Actual packet | |
406 | which created connection will be IP_CT_NEW or for an | |
407 | expected connection, IP_CT_RELATED. */ | |
408 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
409 | return NF_ACCEPT; | |
410 | ||
5d0aa2cc PM |
411 | zone = nf_ct_zone(ct); |
412 | hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
413 | repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
9fb9cbb1 YK |
414 | |
415 | /* We're not in hash table, and we refuse to set up related | |
416 | connections for unconfirmed conns. But packet copies and | |
417 | REJECT will give spurious warnings here. */ | |
418 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
419 | ||
420 | /* No external references means noone else could have | |
421 | confirmed us. */ | |
422 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 423 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 424 | |
f8ba1aff | 425 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 426 | |
fc350777 JM |
427 | /* We have to check the DYING flag inside the lock to prevent |
428 | a race against nf_ct_get_next_corpse() possibly called from | |
429 | user context, else we insert an already 'dead' hash, blocking | |
430 | further use of that particular connection -JM */ | |
431 | ||
432 | if (unlikely(nf_ct_is_dying(ct))) { | |
433 | spin_unlock_bh(&nf_conntrack_lock); | |
434 | return NF_ACCEPT; | |
435 | } | |
436 | ||
9fb9cbb1 YK |
437 | /* See if there's one in the list already, including reverse: |
438 | NAT could have grabbed it without realizing, since we're | |
439 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 440 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc | 441 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
5d0aa2cc PM |
442 | &h->tuple) && |
443 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 444 | goto out; |
ea781f19 | 445 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc | 446 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
5d0aa2cc PM |
447 | &h->tuple) && |
448 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 449 | goto out; |
9fb9cbb1 | 450 | |
df0933dc | 451 | /* Remove from unconfirmed list */ |
ea781f19 | 452 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc | 453 | |
df0933dc PM |
454 | /* Timer relative to confirmation time, not original |
455 | setting time, otherwise we'd get timer wrap in | |
456 | weird delay cases. */ | |
457 | ct->timeout.expires += jiffies; | |
458 | add_timer(&ct->timeout); | |
459 | atomic_inc(&ct->ct_general.use); | |
460 | set_bit(IPS_CONFIRMED_BIT, &ct->status); | |
5c8ec910 PM |
461 | |
462 | /* Since the lookup is lockless, hash insertion must be done after | |
463 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
464 | * guarantee that no other CPU can find the conntrack before the above | |
465 | * stores are visible. | |
466 | */ | |
467 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
0d55af87 | 468 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 469 | spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910 | 470 | |
df0933dc PM |
471 | help = nfct_help(ct); |
472 | if (help && help->helper) | |
a71996fc | 473 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 474 | |
df0933dc | 475 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 476 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 477 | return NF_ACCEPT; |
9fb9cbb1 | 478 | |
df0933dc | 479 | out: |
0d55af87 | 480 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 481 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
482 | return NF_DROP; |
483 | } | |
13b18339 | 484 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
485 | |
486 | /* Returns true if a connection correspondings to the tuple (required | |
487 | for NAT). */ | |
488 | int | |
489 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
490 | const struct nf_conn *ignored_conntrack) | |
491 | { | |
400dad39 | 492 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 493 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 494 | struct hlist_nulls_node *n; |
5d0aa2cc PM |
495 | struct nf_conn *ct; |
496 | u16 zone = nf_ct_zone(ignored_conntrack); | |
497 | unsigned int hash = hash_conntrack(net, zone, tuple); | |
9fb9cbb1 | 498 | |
4e29e9ec PM |
499 | /* Disable BHs the entire time since we need to disable them at |
500 | * least once for the stats anyway. | |
501 | */ | |
502 | rcu_read_lock_bh(); | |
ea781f19 | 503 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
5d0aa2cc PM |
504 | ct = nf_ct_tuplehash_to_ctrack(h); |
505 | if (ct != ignored_conntrack && | |
506 | nf_ct_tuple_equal(tuple, &h->tuple) && | |
507 | nf_ct_zone(ct) == zone) { | |
0d55af87 | 508 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 509 | rcu_read_unlock_bh(); |
ba419aff PM |
510 | return 1; |
511 | } | |
0d55af87 | 512 | NF_CT_STAT_INC(net, searched); |
ba419aff | 513 | } |
4e29e9ec | 514 | rcu_read_unlock_bh(); |
9fb9cbb1 | 515 | |
ba419aff | 516 | return 0; |
9fb9cbb1 | 517 | } |
13b18339 | 518 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 519 | |
7ae7730f PM |
520 | #define NF_CT_EVICTION_RANGE 8 |
521 | ||
9fb9cbb1 YK |
522 | /* There's a small race here where we may free a just-assured |
523 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 524 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 525 | { |
f205c5e0 | 526 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 527 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 528 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 529 | struct hlist_nulls_node *n; |
7ae7730f | 530 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
531 | int dropped = 0; |
532 | ||
76507f69 | 533 | rcu_read_lock(); |
d696c7bd | 534 | for (i = 0; i < net->ct.htable_size; i++) { |
ea781f19 ED |
535 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
536 | hnnode) { | |
7ae7730f PM |
537 | tmp = nf_ct_tuplehash_to_ctrack(h); |
538 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
539 | ct = tmp; | |
540 | cnt++; | |
541 | } | |
76507f69 | 542 | |
5ae27aa2 CG |
543 | if (ct != NULL) { |
544 | if (likely(!nf_ct_is_dying(ct) && | |
545 | atomic_inc_not_zero(&ct->ct_general.use))) | |
546 | break; | |
547 | else | |
548 | ct = NULL; | |
549 | } | |
550 | ||
551 | if (cnt >= NF_CT_EVICTION_RANGE) | |
7ae7730f | 552 | break; |
5ae27aa2 | 553 | |
d696c7bd | 554 | hash = (hash + 1) % net->ct.htable_size; |
9fb9cbb1 | 555 | } |
76507f69 | 556 | rcu_read_unlock(); |
9fb9cbb1 YK |
557 | |
558 | if (!ct) | |
559 | return dropped; | |
560 | ||
561 | if (del_timer(&ct->timeout)) { | |
562 | death_by_timeout((unsigned long)ct); | |
563 | dropped = 1; | |
0d55af87 | 564 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
9fb9cbb1 YK |
565 | } |
566 | nf_ct_put(ct); | |
567 | return dropped; | |
568 | } | |
569 | ||
5d0aa2cc | 570 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, |
5a1fb391 | 571 | const struct nf_conntrack_tuple *orig, |
b891c5a8 PNA |
572 | const struct nf_conntrack_tuple *repl, |
573 | gfp_t gfp) | |
9fb9cbb1 | 574 | { |
cd7fcbf1 | 575 | struct nf_conn *ct; |
9fb9cbb1 | 576 | |
dc808fe2 | 577 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
af07d241 HPP |
578 | get_random_bytes(&nf_conntrack_hash_rnd, |
579 | sizeof(nf_conntrack_hash_rnd)); | |
9fb9cbb1 YK |
580 | nf_conntrack_hash_rnd_initted = 1; |
581 | } | |
582 | ||
5251e2d2 | 583 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 584 | atomic_inc(&net->ct.count); |
5251e2d2 | 585 | |
76eb9460 | 586 | if (nf_conntrack_max && |
49ac8713 | 587 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
5d0aa2cc | 588 | unsigned int hash = hash_conntrack(net, zone, orig); |
400dad39 | 589 | if (!early_drop(net, hash)) { |
49ac8713 | 590 | atomic_dec(&net->ct.count); |
9fb9cbb1 YK |
591 | if (net_ratelimit()) |
592 | printk(KERN_WARNING | |
593 | "nf_conntrack: table full, dropping" | |
594 | " packet.\n"); | |
595 | return ERR_PTR(-ENOMEM); | |
596 | } | |
597 | } | |
598 | ||
941297f4 ED |
599 | /* |
600 | * Do not use kmem_cache_zalloc(), as this cache uses | |
601 | * SLAB_DESTROY_BY_RCU. | |
602 | */ | |
5b3501fa | 603 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
c88130bc | 604 | if (ct == NULL) { |
0d53778e | 605 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
49ac8713 | 606 | atomic_dec(&net->ct.count); |
dacd2a1a | 607 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 608 | } |
941297f4 ED |
609 | /* |
610 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next | |
611 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. | |
612 | */ | |
613 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, | |
614 | sizeof(*ct) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); | |
440f0d58 | 615 | spin_lock_init(&ct->lock); |
c88130bc | 616 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 617 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 618 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
941297f4 | 619 | ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev = NULL; |
9fb9cbb1 | 620 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 621 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9b | 622 | write_pnet(&ct->ct_net, net); |
5d0aa2cc PM |
623 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
624 | if (zone) { | |
625 | struct nf_conntrack_zone *nf_ct_zone; | |
626 | ||
627 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); | |
628 | if (!nf_ct_zone) | |
629 | goto out_free; | |
630 | nf_ct_zone->id = zone; | |
631 | } | |
632 | #endif | |
941297f4 ED |
633 | /* |
634 | * changes to lookup keys must be done before setting refcnt to 1 | |
635 | */ | |
636 | smp_wmb(); | |
637 | atomic_set(&ct->ct_general.use, 1); | |
c88130bc | 638 | return ct; |
5d0aa2cc PM |
639 | |
640 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
641 | out_free: | |
642 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); | |
643 | return ERR_PTR(-ENOMEM); | |
644 | #endif | |
9fb9cbb1 | 645 | } |
13b18339 | 646 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 647 | |
c88130bc | 648 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 649 | { |
1d45209d ED |
650 | struct net *net = nf_ct_net(ct); |
651 | ||
ceeff754 | 652 | nf_ct_ext_destroy(ct); |
1d45209d | 653 | atomic_dec(&net->ct.count); |
ea781f19 | 654 | nf_ct_ext_free(ct); |
5b3501fa | 655 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
76507f69 | 656 | } |
13b18339 | 657 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 YK |
658 | |
659 | /* Allocate a new conntrack: we return -ENOMEM if classification | |
660 | failed due to stress. Otherwise it really is unclassifiable. */ | |
661 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 662 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 663 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 664 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 665 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
666 | struct sk_buff *skb, |
667 | unsigned int dataoff) | |
668 | { | |
c88130bc | 669 | struct nf_conn *ct; |
3c158f7f | 670 | struct nf_conn_help *help; |
9fb9cbb1 | 671 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 672 | struct nf_conntrack_ecache *ecache; |
9fb9cbb1 | 673 | struct nf_conntrack_expect *exp; |
5d0aa2cc | 674 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
9fb9cbb1 | 675 | |
605dcad6 | 676 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 677 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
678 | return NULL; |
679 | } | |
680 | ||
5d0aa2cc | 681 | ct = nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC); |
cd7fcbf1 | 682 | if (IS_ERR(ct)) { |
0d53778e | 683 | pr_debug("Can't allocate conntrack.\n"); |
c88130bc | 684 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 YK |
685 | } |
686 | ||
c88130bc PM |
687 | if (!l4proto->new(ct, skb, dataoff)) { |
688 | nf_conntrack_free(ct); | |
0d53778e | 689 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
690 | return NULL; |
691 | } | |
692 | ||
58401572 | 693 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
b2a15a60 PM |
694 | |
695 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
696 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
697 | ecache ? ecache->expmask : 0, | |
698 | GFP_ATOMIC); | |
58401572 | 699 | |
f8ba1aff | 700 | spin_lock_bh(&nf_conntrack_lock); |
5d0aa2cc | 701 | exp = nf_ct_find_expectation(net, zone, tuple); |
9fb9cbb1 | 702 | if (exp) { |
0d53778e | 703 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 704 | ct, exp); |
9fb9cbb1 | 705 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
706 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
707 | ct->master = exp->master; | |
ceceae1b | 708 | if (exp->helper) { |
c88130bc | 709 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ceceae1b YK |
710 | if (help) |
711 | rcu_assign_pointer(help->helper, exp->helper); | |
ceceae1b YK |
712 | } |
713 | ||
9fb9cbb1 | 714 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 715 | ct->mark = exp->master->mark; |
7c9728c3 JM |
716 | #endif |
717 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 718 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 719 | #endif |
c88130bc | 720 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 721 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 722 | } else { |
b2a15a60 | 723 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af87 | 724 | NF_CT_STAT_INC(net, new); |
22e7410b | 725 | } |
9fb9cbb1 YK |
726 | |
727 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 728 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 729 | &net->ct.unconfirmed); |
9fb9cbb1 | 730 | |
f8ba1aff | 731 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
732 | |
733 | if (exp) { | |
734 | if (exp->expectfn) | |
c88130bc | 735 | exp->expectfn(ct, exp); |
6823645d | 736 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
737 | } |
738 | ||
c88130bc | 739 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
740 | } |
741 | ||
742 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
743 | static inline struct nf_conn * | |
b2a15a60 | 744 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 745 | struct sk_buff *skb, |
9fb9cbb1 YK |
746 | unsigned int dataoff, |
747 | u_int16_t l3num, | |
748 | u_int8_t protonum, | |
749 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 750 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 YK |
751 | int *set_reply, |
752 | enum ip_conntrack_info *ctinfo) | |
753 | { | |
754 | struct nf_conntrack_tuple tuple; | |
755 | struct nf_conntrack_tuple_hash *h; | |
756 | struct nf_conn *ct; | |
5d0aa2cc | 757 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
9fb9cbb1 | 758 | |
bbe735e4 | 759 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 760 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 761 | l4proto)) { |
0d53778e | 762 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
763 | return NULL; |
764 | } | |
765 | ||
766 | /* look for tuple match */ | |
5d0aa2cc | 767 | h = nf_conntrack_find_get(net, zone, &tuple); |
9fb9cbb1 | 768 | if (!h) { |
b2a15a60 PM |
769 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
770 | skb, dataoff); | |
9fb9cbb1 YK |
771 | if (!h) |
772 | return NULL; | |
773 | if (IS_ERR(h)) | |
774 | return (void *)h; | |
775 | } | |
776 | ct = nf_ct_tuplehash_to_ctrack(h); | |
777 | ||
778 | /* It exists; we have (non-exclusive) reference. */ | |
779 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
780 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; | |
781 | /* Please set reply bit if this packet OK */ | |
782 | *set_reply = 1; | |
783 | } else { | |
784 | /* Once we've had two way comms, always ESTABLISHED. */ | |
785 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 786 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
787 | *ctinfo = IP_CT_ESTABLISHED; |
788 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
789 | pr_debug("nf_conntrack_in: related packet for %p\n", |
790 | ct); | |
9fb9cbb1 YK |
791 | *ctinfo = IP_CT_RELATED; |
792 | } else { | |
0d53778e | 793 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
794 | *ctinfo = IP_CT_NEW; |
795 | } | |
796 | *set_reply = 0; | |
797 | } | |
798 | skb->nfct = &ct->ct_general; | |
799 | skb->nfctinfo = *ctinfo; | |
800 | return ct; | |
801 | } | |
802 | ||
803 | unsigned int | |
a702a65f AD |
804 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
805 | struct sk_buff *skb) | |
9fb9cbb1 | 806 | { |
b2a15a60 | 807 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
808 | enum ip_conntrack_info ctinfo; |
809 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 810 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 YK |
811 | unsigned int dataoff; |
812 | u_int8_t protonum; | |
813 | int set_reply = 0; | |
814 | int ret; | |
815 | ||
3db05fea | 816 | if (skb->nfct) { |
b2a15a60 PM |
817 | /* Previously seen (loopback or untracked)? Ignore. */ |
818 | tmpl = (struct nf_conn *)skb->nfct; | |
819 | if (!nf_ct_is_template(tmpl)) { | |
820 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
821 | return NF_ACCEPT; | |
822 | } | |
823 | skb->nfct = NULL; | |
9fb9cbb1 YK |
824 | } |
825 | ||
923f4902 | 826 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 827 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 828 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
829 | &dataoff, &protonum); |
830 | if (ret <= 0) { | |
0d53778e | 831 | pr_debug("not prepared to track yet or error occured\n"); |
0d55af87 AD |
832 | NF_CT_STAT_INC_ATOMIC(net, error); |
833 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
834 | ret = -ret; |
835 | goto out; | |
9fb9cbb1 YK |
836 | } |
837 | ||
76108cea | 838 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
839 | |
840 | /* It may be an special packet, error, unclean... | |
841 | * inverse of the return code tells to the netfilter | |
842 | * core what to do with the packet. */ | |
74c51a14 | 843 | if (l4proto->error != NULL) { |
8fea97ec PM |
844 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
845 | pf, hooknum); | |
74c51a14 | 846 | if (ret <= 0) { |
0d55af87 AD |
847 | NF_CT_STAT_INC_ATOMIC(net, error); |
848 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
849 | ret = -ret; |
850 | goto out; | |
74c51a14 | 851 | } |
9fb9cbb1 YK |
852 | } |
853 | ||
b2a15a60 | 854 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
a702a65f | 855 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
856 | if (!ct) { |
857 | /* Not valid part of a connection */ | |
0d55af87 | 858 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
859 | ret = NF_ACCEPT; |
860 | goto out; | |
9fb9cbb1 YK |
861 | } |
862 | ||
863 | if (IS_ERR(ct)) { | |
864 | /* Too stressed to deal. */ | |
0d55af87 | 865 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
866 | ret = NF_DROP; |
867 | goto out; | |
9fb9cbb1 YK |
868 | } |
869 | ||
3db05fea | 870 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 871 | |
3db05fea | 872 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
ec8d5409 | 873 | if (ret <= 0) { |
9fb9cbb1 YK |
874 | /* Invalid: inverse of the return code tells |
875 | * the netfilter core what to do */ | |
0d53778e | 876 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
877 | nf_conntrack_put(skb->nfct); |
878 | skb->nfct = NULL; | |
0d55af87 | 879 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
880 | if (ret == -NF_DROP) |
881 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
882 | ret = -ret; |
883 | goto out; | |
9fb9cbb1 YK |
884 | } |
885 | ||
886 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 887 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 PM |
888 | out: |
889 | if (tmpl) | |
890 | nf_ct_put(tmpl); | |
9fb9cbb1 YK |
891 | |
892 | return ret; | |
893 | } | |
13b18339 | 894 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 895 | |
5f2b4c90 JE |
896 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
897 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 898 | { |
5f2b4c90 | 899 | bool ret; |
923f4902 PM |
900 | |
901 | rcu_read_lock(); | |
902 | ret = nf_ct_invert_tuple(inverse, orig, | |
903 | __nf_ct_l3proto_find(orig->src.l3num), | |
904 | __nf_ct_l4proto_find(orig->src.l3num, | |
905 | orig->dst.protonum)); | |
906 | rcu_read_unlock(); | |
907 | return ret; | |
9fb9cbb1 | 908 | } |
13b18339 | 909 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 910 | |
5b1158e9 JK |
911 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
912 | implicitly racy: see __nf_conntrack_confirm */ | |
913 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
914 | const struct nf_conntrack_tuple *newreply) | |
915 | { | |
916 | struct nf_conn_help *help = nfct_help(ct); | |
917 | ||
5b1158e9 JK |
918 | /* Should be unconfirmed, so not in hash table yet */ |
919 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
920 | ||
0d53778e | 921 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 922 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
923 | |
924 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 925 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 926 | return; |
ceceae1b | 927 | |
c52fbb41 | 928 | rcu_read_lock(); |
b2a15a60 | 929 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 930 | rcu_read_unlock(); |
5b1158e9 | 931 | } |
13b18339 | 932 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 933 | |
9fb9cbb1 YK |
934 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
935 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
936 | enum ip_conntrack_info ctinfo, | |
937 | const struct sk_buff *skb, | |
938 | unsigned long extra_jiffies, | |
939 | int do_acct) | |
940 | { | |
9fb9cbb1 YK |
941 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
942 | NF_CT_ASSERT(skb); | |
943 | ||
997ae831 | 944 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
945 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
946 | goto acct; | |
997ae831 | 947 | |
9fb9cbb1 YK |
948 | /* If not in hash table, timer will not be active yet */ |
949 | if (!nf_ct_is_confirmed(ct)) { | |
950 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 951 | } else { |
be00c8e4 MJ |
952 | unsigned long newtime = jiffies + extra_jiffies; |
953 | ||
954 | /* Only update the timeout if the new timeout is at least | |
955 | HZ jiffies from the old timeout. Need del_timer for race | |
956 | avoidance (may already be dying). */ | |
65cb9fda PM |
957 | if (newtime - ct->timeout.expires >= HZ) |
958 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
959 | } |
960 | ||
47d95045 | 961 | acct: |
9fb9cbb1 | 962 | if (do_acct) { |
58401572 | 963 | struct nf_conn_counter *acct; |
3ffd5eeb | 964 | |
58401572 KPO |
965 | acct = nf_conn_acct_find(ct); |
966 | if (acct) { | |
65cb9fda | 967 | spin_lock_bh(&ct->lock); |
58401572 | 968 | acct[CTINFO2DIR(ctinfo)].packets++; |
6661481d | 969 | acct[CTINFO2DIR(ctinfo)].bytes += skb->len; |
65cb9fda | 970 | spin_unlock_bh(&ct->lock); |
58401572 | 971 | } |
9fb9cbb1 | 972 | } |
9fb9cbb1 | 973 | } |
13b18339 | 974 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 975 | |
4c889498 DM |
976 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
977 | enum ip_conntrack_info ctinfo, | |
978 | const struct sk_buff *skb, | |
979 | int do_acct) | |
51091764 | 980 | { |
718d4ad9 | 981 | if (do_acct) { |
58401572 KPO |
982 | struct nf_conn_counter *acct; |
983 | ||
58401572 KPO |
984 | acct = nf_conn_acct_find(ct); |
985 | if (acct) { | |
65cb9fda | 986 | spin_lock_bh(&ct->lock); |
58401572 KPO |
987 | acct[CTINFO2DIR(ctinfo)].packets++; |
988 | acct[CTINFO2DIR(ctinfo)].bytes += | |
989 | skb->len - skb_network_offset(skb); | |
65cb9fda | 990 | spin_unlock_bh(&ct->lock); |
58401572 | 991 | } |
718d4ad9 | 992 | } |
58401572 | 993 | |
4c889498 | 994 | if (del_timer(&ct->timeout)) { |
51091764 | 995 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
996 | return true; |
997 | } | |
998 | return false; | |
51091764 | 999 | } |
718d4ad9 | 1000 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 1001 | |
5d0aa2cc PM |
1002 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1003 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { | |
1004 | .len = sizeof(struct nf_conntrack_zone), | |
1005 | .align = __alignof__(struct nf_conntrack_zone), | |
1006 | .id = NF_CT_EXT_ZONE, | |
1007 | }; | |
1008 | #endif | |
1009 | ||
e281db5c | 1010 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
1011 | |
1012 | #include <linux/netfilter/nfnetlink.h> | |
1013 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1014 | #include <linux/mutex.h> |
1015 | ||
c1d10adb PNA |
1016 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1017 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1018 | * or depend on ctnetlink */ | |
fdf70832 | 1019 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1020 | const struct nf_conntrack_tuple *tuple) |
1021 | { | |
77236b6e PM |
1022 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
1023 | NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); | |
c1d10adb PNA |
1024 | return 0; |
1025 | ||
df6fb868 | 1026 | nla_put_failure: |
c1d10adb PNA |
1027 | return -1; |
1028 | } | |
fdf70832 | 1029 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1030 | |
f73e924c PM |
1031 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1032 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1033 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1034 | }; |
f73e924c | 1035 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1036 | |
fdf70832 | 1037 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1038 | struct nf_conntrack_tuple *t) |
1039 | { | |
df6fb868 | 1040 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1041 | return -EINVAL; |
1042 | ||
77236b6e PM |
1043 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1044 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1045 | |
1046 | return 0; | |
1047 | } | |
fdf70832 | 1048 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1049 | |
1050 | int nf_ct_port_nlattr_tuple_size(void) | |
1051 | { | |
1052 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1053 | } | |
1054 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1055 | #endif |
1056 | ||
9fb9cbb1 | 1057 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc | 1058 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb1 YK |
1059 | { |
1060 | struct nf_conn *ct; | |
1061 | enum ip_conntrack_info ctinfo; | |
1062 | ||
1063 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1064 | ct = nf_ct_get(skb, &ctinfo); | |
1065 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
1066 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; | |
1067 | else | |
1068 | ctinfo = IP_CT_RELATED; | |
1069 | ||
1070 | /* Attach to new skbuff, and increment count */ | |
1071 | nskb->nfct = &ct->ct_general; | |
1072 | nskb->nfctinfo = ctinfo; | |
1073 | nf_conntrack_get(nskb->nfct); | |
1074 | } | |
1075 | ||
9fb9cbb1 | 1076 | /* Bring out ya dead! */ |
df0933dc | 1077 | static struct nf_conn * |
400dad39 | 1078 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1079 | void *data, unsigned int *bucket) |
1080 | { | |
df0933dc PM |
1081 | struct nf_conntrack_tuple_hash *h; |
1082 | struct nf_conn *ct; | |
ea781f19 | 1083 | struct hlist_nulls_node *n; |
9fb9cbb1 | 1084 | |
f8ba1aff | 1085 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1086 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
ea781f19 | 1087 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
df0933dc PM |
1088 | ct = nf_ct_tuplehash_to_ctrack(h); |
1089 | if (iter(ct, data)) | |
1090 | goto found; | |
1091 | } | |
601e68e1 | 1092 | } |
ea781f19 | 1093 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
1094 | ct = nf_ct_tuplehash_to_ctrack(h); |
1095 | if (iter(ct, data)) | |
ec68e97d | 1096 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 1097 | } |
f8ba1aff | 1098 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
1099 | return NULL; |
1100 | found: | |
c073e3fa | 1101 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1102 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1103 | return ct; |
9fb9cbb1 YK |
1104 | } |
1105 | ||
400dad39 AD |
1106 | void nf_ct_iterate_cleanup(struct net *net, |
1107 | int (*iter)(struct nf_conn *i, void *data), | |
1108 | void *data) | |
9fb9cbb1 | 1109 | { |
df0933dc | 1110 | struct nf_conn *ct; |
9fb9cbb1 YK |
1111 | unsigned int bucket = 0; |
1112 | ||
400dad39 | 1113 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1114 | /* Time to push up daises... */ |
1115 | if (del_timer(&ct->timeout)) | |
1116 | death_by_timeout((unsigned long)ct); | |
1117 | /* ... else the timer will get him soon. */ | |
1118 | ||
1119 | nf_ct_put(ct); | |
1120 | } | |
1121 | } | |
13b18339 | 1122 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1123 | |
19abb7b0 PNA |
1124 | struct __nf_ct_flush_report { |
1125 | u32 pid; | |
1126 | int report; | |
1127 | }; | |
1128 | ||
274d383b | 1129 | static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb1 | 1130 | { |
19abb7b0 PNA |
1131 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
1132 | ||
dd7669a9 PNA |
1133 | /* If we fail to deliver the event, death_by_timeout() will retry */ |
1134 | if (nf_conntrack_event_report(IPCT_DESTROY, i, | |
1135 | fr->pid, fr->report) < 0) | |
1136 | return 1; | |
1137 | ||
1138 | /* Avoid the delivery of the destroy event in death_by_timeout(). */ | |
1139 | set_bit(IPS_DYING_BIT, &i->status); | |
9fb9cbb1 YK |
1140 | return 1; |
1141 | } | |
1142 | ||
274d383b PNA |
1143 | static int kill_all(struct nf_conn *i, void *data) |
1144 | { | |
1145 | return 1; | |
1146 | } | |
1147 | ||
ea781f19 | 1148 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
9fb9cbb1 YK |
1149 | { |
1150 | if (vmalloced) | |
1151 | vfree(hash); | |
1152 | else | |
601e68e1 | 1153 | free_pages((unsigned long)hash, |
f205c5e0 | 1154 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1155 | } |
ac565e5f | 1156 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1157 | |
274d383b | 1158 | void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
c1d10adb | 1159 | { |
19abb7b0 PNA |
1160 | struct __nf_ct_flush_report fr = { |
1161 | .pid = pid, | |
1162 | .report = report, | |
1163 | }; | |
274d383b | 1164 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb | 1165 | } |
274d383b | 1166 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1167 | |
ee254fa4 | 1168 | static void nf_ct_release_dying_list(struct net *net) |
dd7669a9 PNA |
1169 | { |
1170 | struct nf_conntrack_tuple_hash *h; | |
1171 | struct nf_conn *ct; | |
1172 | struct hlist_nulls_node *n; | |
1173 | ||
1174 | spin_lock_bh(&nf_conntrack_lock); | |
ee254fa4 | 1175 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a9 PNA |
1176 | ct = nf_ct_tuplehash_to_ctrack(h); |
1177 | /* never fails to remove them, no listeners at this point */ | |
1178 | nf_ct_kill(ct); | |
1179 | } | |
1180 | spin_unlock_bh(&nf_conntrack_lock); | |
1181 | } | |
1182 | ||
b3c5163f ED |
1183 | static int untrack_refs(void) |
1184 | { | |
1185 | int cnt = 0, cpu; | |
1186 | ||
1187 | for_each_possible_cpu(cpu) { | |
1188 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1189 | ||
1190 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1191 | } | |
1192 | return cnt; | |
1193 | } | |
1194 | ||
08f6547d | 1195 | static void nf_conntrack_cleanup_init_net(void) |
9fb9cbb1 | 1196 | { |
b3c5163f | 1197 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1198 | schedule(); |
1199 | ||
08f6547d AD |
1200 | nf_conntrack_helper_fini(); |
1201 | nf_conntrack_proto_fini(); | |
5d0aa2cc PM |
1202 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1203 | nf_ct_extend_unregister(&nf_ct_zone_extend); | |
1204 | #endif | |
08f6547d | 1205 | } |
9fb9cbb1 | 1206 | |
08f6547d AD |
1207 | static void nf_conntrack_cleanup_net(struct net *net) |
1208 | { | |
9fb9cbb1 | 1209 | i_see_dead_people: |
274d383b | 1210 | nf_ct_iterate_cleanup(net, kill_all, NULL); |
ee254fa4 | 1211 | nf_ct_release_dying_list(net); |
49ac8713 | 1212 | if (atomic_read(&net->ct.count) != 0) { |
9fb9cbb1 YK |
1213 | schedule(); |
1214 | goto i_see_dead_people; | |
1215 | } | |
1216 | ||
400dad39 | 1217 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
d696c7bd | 1218 | net->ct.htable_size); |
a0891aa6 | 1219 | nf_conntrack_ecache_fini(net); |
d716a4df | 1220 | nf_conntrack_acct_fini(net); |
9b03f38d | 1221 | nf_conntrack_expect_fini(net); |
5b3501fa ED |
1222 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
1223 | kfree(net->ct.slabname); | |
0d55af87 | 1224 | free_percpu(net->ct.stat); |
08f6547d AD |
1225 | } |
1226 | ||
1227 | /* Mishearing the voices in his head, our hero wonders how he's | |
1228 | supposed to kill the mall. */ | |
1229 | void nf_conntrack_cleanup(struct net *net) | |
1230 | { | |
1231 | if (net_eq(net, &init_net)) | |
1232 | rcu_assign_pointer(ip_ct_attach, NULL); | |
1233 | ||
1234 | /* This makes sure all current packets have passed through | |
1235 | netfilter framework. Roll on, two-stage module | |
1236 | delete... */ | |
1237 | synchronize_net(); | |
1238 | ||
1239 | nf_conntrack_cleanup_net(net); | |
1240 | ||
1241 | if (net_eq(net, &init_net)) { | |
1242 | rcu_assign_pointer(nf_ct_destroy, NULL); | |
1243 | nf_conntrack_cleanup_init_net(); | |
1244 | } | |
9fb9cbb1 YK |
1245 | } |
1246 | ||
ea781f19 | 1247 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
9fb9cbb1 | 1248 | { |
ea781f19 ED |
1249 | struct hlist_nulls_head *hash; |
1250 | unsigned int nr_slots, i; | |
1251 | size_t sz; | |
9fb9cbb1 | 1252 | |
601e68e1 | 1253 | *vmalloced = 0; |
8e5105a0 | 1254 | |
ea781f19 ED |
1255 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1256 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1257 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1258 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1259 | get_order(sz)); | |
601e68e1 | 1260 | if (!hash) { |
9fb9cbb1 YK |
1261 | *vmalloced = 1; |
1262 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); | |
ea781f19 | 1263 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
9fb9cbb1 YK |
1264 | } |
1265 | ||
ea781f19 ED |
1266 | if (hash && nulls) |
1267 | for (i = 0; i < nr_slots; i++) | |
1268 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1269 | |
1270 | return hash; | |
1271 | } | |
ac565e5f | 1272 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1273 | |
fae718dd | 1274 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1275 | { |
96eb24d7 SH |
1276 | int i, bucket, vmalloced, old_vmalloced; |
1277 | unsigned int hashsize, old_size; | |
ea781f19 | 1278 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1279 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1280 | struct nf_conn *ct; |
9fb9cbb1 | 1281 | |
d696c7bd PM |
1282 | if (current->nsproxy->net_ns != &init_net) |
1283 | return -EOPNOTSUPP; | |
1284 | ||
9fb9cbb1 YK |
1285 | /* On boot, we can set this without any fancy locking. */ |
1286 | if (!nf_conntrack_htable_size) | |
1287 | return param_set_uint(val, kp); | |
1288 | ||
96eb24d7 | 1289 | hashsize = simple_strtoul(val, NULL, 0); |
9fb9cbb1 YK |
1290 | if (!hashsize) |
1291 | return -EINVAL; | |
1292 | ||
ea781f19 | 1293 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
9fb9cbb1 YK |
1294 | if (!hash) |
1295 | return -ENOMEM; | |
1296 | ||
76507f69 PM |
1297 | /* Lookups in the old hash might happen in parallel, which means we |
1298 | * might get false negatives during connection lookup. New connections | |
1299 | * created because of a false negative won't make it into the hash | |
1300 | * though since that required taking the lock. | |
1301 | */ | |
f8ba1aff | 1302 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1303 | for (i = 0; i < init_net.ct.htable_size; i++) { |
ea781f19 ED |
1304 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1305 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1306 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1307 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1308 | hlist_nulls_del_rcu(&h->hnnode); |
5d0aa2cc PM |
1309 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
1310 | hashsize, | |
d696c7bd | 1311 | nf_conntrack_hash_rnd); |
ea781f19 | 1312 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1313 | } |
1314 | } | |
d696c7bd | 1315 | old_size = init_net.ct.htable_size; |
400dad39 AD |
1316 | old_vmalloced = init_net.ct.hash_vmalloc; |
1317 | old_hash = init_net.ct.hash; | |
9fb9cbb1 | 1318 | |
d696c7bd | 1319 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
400dad39 AD |
1320 | init_net.ct.hash_vmalloc = vmalloced; |
1321 | init_net.ct.hash = hash; | |
f8ba1aff | 1322 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1323 | |
ac565e5f | 1324 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
9fb9cbb1 YK |
1325 | return 0; |
1326 | } | |
fae718dd | 1327 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1328 | |
fae718dd | 1329 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1330 | &nf_conntrack_htable_size, 0600); |
1331 | ||
5bfddbd4 ED |
1332 | void nf_ct_untracked_status_or(unsigned long bits) |
1333 | { | |
b3c5163f ED |
1334 | int cpu; |
1335 | ||
1336 | for_each_possible_cpu(cpu) | |
1337 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1338 | } |
1339 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1340 | ||
08f6547d | 1341 | static int nf_conntrack_init_init_net(void) |
9fb9cbb1 | 1342 | { |
f205c5e0 | 1343 | int max_factor = 8; |
b3c5163f | 1344 | int ret, cpu; |
9fb9cbb1 YK |
1345 | |
1346 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1347 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1348 | if (!nf_conntrack_htable_size) { |
1349 | nf_conntrack_htable_size | |
4481374c | 1350 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1351 | / sizeof(struct hlist_head)); |
4481374c | 1352 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1353 | nf_conntrack_htable_size = 16384; |
1354 | if (nf_conntrack_htable_size < 32) | |
1355 | nf_conntrack_htable_size = 32; | |
1356 | ||
1357 | /* Use a max. factor of four by default to get the same max as | |
1358 | * with the old struct list_heads. When a table size is given | |
1359 | * we use the old value of 8 to avoid reducing the max. | |
1360 | * entries. */ | |
1361 | max_factor = 4; | |
9fb9cbb1 | 1362 | } |
f205c5e0 | 1363 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1364 | |
654d0fbd | 1365 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1366 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1367 | nf_conntrack_max); | |
1368 | ||
e9c1b084 PM |
1369 | ret = nf_conntrack_proto_init(); |
1370 | if (ret < 0) | |
08f6547d | 1371 | goto err_proto; |
933a41e7 | 1372 | |
ceceae1b YK |
1373 | ret = nf_conntrack_helper_init(); |
1374 | if (ret < 0) | |
08f6547d AD |
1375 | goto err_helper; |
1376 | ||
5d0aa2cc PM |
1377 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1378 | ret = nf_ct_extend_register(&nf_ct_zone_extend); | |
1379 | if (ret < 0) | |
1380 | goto err_extend; | |
1381 | #endif | |
9edd7ca0 | 1382 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1383 | for_each_possible_cpu(cpu) { |
1384 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1385 | write_pnet(&ct->ct_net, &init_net); |
1386 | atomic_set(&ct->ct_general.use, 1); | |
1387 | } | |
9edd7ca0 | 1388 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1389 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d AD |
1390 | return 0; |
1391 | ||
5d0aa2cc PM |
1392 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1393 | err_extend: | |
1394 | nf_conntrack_helper_fini(); | |
1395 | #endif | |
08f6547d AD |
1396 | err_helper: |
1397 | nf_conntrack_proto_fini(); | |
1398 | err_proto: | |
08f6547d AD |
1399 | return ret; |
1400 | } | |
1401 | ||
8cc20198 ED |
1402 | /* |
1403 | * We need to use special "null" values, not used in hash table | |
1404 | */ | |
1405 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1406 | #define DYING_NULLS_VAL ((1<<30)+1) | |
1407 | ||
08f6547d AD |
1408 | static int nf_conntrack_init_net(struct net *net) |
1409 | { | |
1410 | int ret; | |
ceceae1b | 1411 | |
08f6547d | 1412 | atomic_set(&net->ct.count, 0); |
8cc20198 ED |
1413 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
1414 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); | |
08f6547d AD |
1415 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1416 | if (!net->ct.stat) { | |
1417 | ret = -ENOMEM; | |
1418 | goto err_stat; | |
1419 | } | |
5b3501fa ED |
1420 | |
1421 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); | |
1422 | if (!net->ct.slabname) { | |
1423 | ret = -ENOMEM; | |
1424 | goto err_slabname; | |
1425 | } | |
1426 | ||
1427 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, | |
1428 | sizeof(struct nf_conn), 0, | |
1429 | SLAB_DESTROY_BY_RCU, NULL); | |
1430 | if (!net->ct.nf_conntrack_cachep) { | |
1431 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); | |
1432 | ret = -ENOMEM; | |
1433 | goto err_cache; | |
1434 | } | |
d696c7bd PM |
1435 | |
1436 | net->ct.htable_size = nf_conntrack_htable_size; | |
1437 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, | |
ea781f19 | 1438 | &net->ct.hash_vmalloc, 1); |
08f6547d AD |
1439 | if (!net->ct.hash) { |
1440 | ret = -ENOMEM; | |
1441 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1442 | goto err_hash; | |
1443 | } | |
1444 | ret = nf_conntrack_expect_init(net); | |
1445 | if (ret < 0) | |
1446 | goto err_expect; | |
d716a4df | 1447 | ret = nf_conntrack_acct_init(net); |
58401572 | 1448 | if (ret < 0) |
08f6547d | 1449 | goto err_acct; |
a0891aa6 PNA |
1450 | ret = nf_conntrack_ecache_init(net); |
1451 | if (ret < 0) | |
1452 | goto err_ecache; | |
7d3cdc6b | 1453 | |
08f6547d | 1454 | return 0; |
9fb9cbb1 | 1455 | |
a0891aa6 PNA |
1456 | err_ecache: |
1457 | nf_conntrack_acct_fini(net); | |
08f6547d | 1458 | err_acct: |
9b03f38d | 1459 | nf_conntrack_expect_fini(net); |
08f6547d | 1460 | err_expect: |
400dad39 | 1461 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
d696c7bd | 1462 | net->ct.htable_size); |
6058fa6b | 1463 | err_hash: |
5b3501fa ED |
1464 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
1465 | err_cache: | |
1466 | kfree(net->ct.slabname); | |
1467 | err_slabname: | |
0d55af87 AD |
1468 | free_percpu(net->ct.stat); |
1469 | err_stat: | |
08f6547d AD |
1470 | return ret; |
1471 | } | |
1472 | ||
f9dd09c7 JK |
1473 | s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
1474 | enum ip_conntrack_dir dir, | |
1475 | u32 seq); | |
1476 | EXPORT_SYMBOL_GPL(nf_ct_nat_offset); | |
1477 | ||
08f6547d AD |
1478 | int nf_conntrack_init(struct net *net) |
1479 | { | |
1480 | int ret; | |
1481 | ||
1482 | if (net_eq(net, &init_net)) { | |
1483 | ret = nf_conntrack_init_init_net(); | |
1484 | if (ret < 0) | |
1485 | goto out_init_net; | |
1486 | } | |
1487 | ret = nf_conntrack_init_net(net); | |
1488 | if (ret < 0) | |
1489 | goto out_net; | |
1490 | ||
1491 | if (net_eq(net, &init_net)) { | |
1492 | /* For use by REJECT target */ | |
1493 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); | |
1494 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); | |
f9dd09c7 JK |
1495 | |
1496 | /* Howto get NAT offsets */ | |
1497 | rcu_assign_pointer(nf_ct_nat_offset, NULL); | |
08f6547d AD |
1498 | } |
1499 | return 0; | |
1500 | ||
1501 | out_net: | |
1502 | if (net_eq(net, &init_net)) | |
1503 | nf_conntrack_cleanup_init_net(); | |
1504 | out_init_net: | |
1505 | return ret; | |
9fb9cbb1 | 1506 | } |