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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 | 7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
f229f6ce | 8 | * (C) 2005-2012 Patrick McHardy <kaber@trash.net> |
9fb9cbb1 YK |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
13 | */ |
14 | ||
ccd63c20 WJ |
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
16 | ||
9fb9cbb1 YK |
17 | #include <linux/types.h> |
18 | #include <linux/netfilter.h> | |
19 | #include <linux/module.h> | |
d43c36dc | 20 | #include <linux/sched.h> |
9fb9cbb1 YK |
21 | #include <linux/skbuff.h> |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/stddef.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/jhash.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/percpu.h> | |
30 | #include <linux/moduleparam.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/socket.h> | |
d7fe0f24 | 35 | #include <linux/mm.h> |
d696c7bd | 36 | #include <linux/nsproxy.h> |
ea781f19 | 37 | #include <linux/rculist_nulls.h> |
9fb9cbb1 | 38 | |
9fb9cbb1 YK |
39 | #include <net/netfilter/nf_conntrack.h> |
40 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 41 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 42 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 | 43 | #include <net/netfilter/nf_conntrack_helper.h> |
41d73ec0 | 44 | #include <net/netfilter/nf_conntrack_seqadj.h> |
9fb9cbb1 | 45 | #include <net/netfilter/nf_conntrack_core.h> |
ecfab2c9 | 46 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 47 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 48 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 49 | #include <net/netfilter/nf_conntrack_zones.h> |
a992ca2a | 50 | #include <net/netfilter/nf_conntrack_timestamp.h> |
dd705072 | 51 | #include <net/netfilter/nf_conntrack_timeout.h> |
c539f017 | 52 | #include <net/netfilter/nf_conntrack_labels.h> |
48b1de4c | 53 | #include <net/netfilter/nf_conntrack_synproxy.h> |
e6a7d3c0 | 54 | #include <net/netfilter/nf_nat.h> |
e17b666a | 55 | #include <net/netfilter/nf_nat_core.h> |
49376368 | 56 | #include <net/netfilter/nf_nat_helper.h> |
1b8c8a9f | 57 | #include <net/netns/hash.h> |
9fb9cbb1 | 58 | |
dc808fe2 | 59 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 60 | |
e17b666a PM |
61 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
62 | enum nf_nat_manip_type manip, | |
39938324 | 63 | const struct nlattr *attr) __read_mostly; |
e6a7d3c0 PNA |
64 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
65 | ||
93bb0ceb JDB |
66 | __cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; |
67 | EXPORT_SYMBOL_GPL(nf_conntrack_locks); | |
9fb9cbb1 | 68 | |
ca7433df JDB |
69 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock); |
70 | EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock); | |
71 | ||
56d52d48 FW |
72 | struct hlist_nulls_head *nf_conntrack_hash __read_mostly; |
73 | EXPORT_SYMBOL_GPL(nf_conntrack_hash); | |
74 | ||
0c5366b3 | 75 | static __read_mostly struct kmem_cache *nf_conntrack_cachep; |
b16c2919 | 76 | static __read_mostly spinlock_t nf_conntrack_locks_all_lock; |
a3efd812 | 77 | static __read_mostly seqcount_t nf_conntrack_generation; |
70d72b7e | 78 | static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock); |
b16c2919 SL |
79 | static __read_mostly bool nf_conntrack_locks_all; |
80 | ||
81 | void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) | |
82 | { | |
83 | spin_lock(lock); | |
84 | while (unlikely(nf_conntrack_locks_all)) { | |
85 | spin_unlock(lock); | |
e39365be | 86 | spin_unlock_wait(&nf_conntrack_locks_all_lock); |
b16c2919 SL |
87 | spin_lock(lock); |
88 | } | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); | |
91 | ||
93bb0ceb JDB |
92 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
93 | { | |
94 | h1 %= CONNTRACK_LOCKS; | |
95 | h2 %= CONNTRACK_LOCKS; | |
96 | spin_unlock(&nf_conntrack_locks[h1]); | |
97 | if (h1 != h2) | |
98 | spin_unlock(&nf_conntrack_locks[h2]); | |
99 | } | |
100 | ||
101 | /* return true if we need to recompute hashes (in case hash table was resized) */ | |
102 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, | |
103 | unsigned int h2, unsigned int sequence) | |
104 | { | |
105 | h1 %= CONNTRACK_LOCKS; | |
106 | h2 %= CONNTRACK_LOCKS; | |
107 | if (h1 <= h2) { | |
b16c2919 | 108 | nf_conntrack_lock(&nf_conntrack_locks[h1]); |
93bb0ceb JDB |
109 | if (h1 != h2) |
110 | spin_lock_nested(&nf_conntrack_locks[h2], | |
111 | SINGLE_DEPTH_NESTING); | |
112 | } else { | |
b16c2919 | 113 | nf_conntrack_lock(&nf_conntrack_locks[h2]); |
93bb0ceb JDB |
114 | spin_lock_nested(&nf_conntrack_locks[h1], |
115 | SINGLE_DEPTH_NESTING); | |
116 | } | |
a3efd812 | 117 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
93bb0ceb JDB |
118 | nf_conntrack_double_unlock(h1, h2); |
119 | return true; | |
120 | } | |
121 | return false; | |
122 | } | |
123 | ||
124 | static void nf_conntrack_all_lock(void) | |
125 | { | |
126 | int i; | |
127 | ||
b16c2919 SL |
128 | spin_lock(&nf_conntrack_locks_all_lock); |
129 | nf_conntrack_locks_all = true; | |
130 | ||
131 | for (i = 0; i < CONNTRACK_LOCKS; i++) { | |
e39365be | 132 | spin_unlock_wait(&nf_conntrack_locks[i]); |
b16c2919 | 133 | } |
93bb0ceb JDB |
134 | } |
135 | ||
136 | static void nf_conntrack_all_unlock(void) | |
137 | { | |
b16c2919 SL |
138 | nf_conntrack_locks_all = false; |
139 | spin_unlock(&nf_conntrack_locks_all_lock); | |
93bb0ceb JDB |
140 | } |
141 | ||
e2b7606c | 142 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
143 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
144 | ||
e478075c | 145 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 146 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 147 | |
b3c5163f ED |
148 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
149 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 150 | |
141658fb | 151 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
9fb9cbb1 | 152 | |
1b8c8a9f FW |
153 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, |
154 | const struct net *net) | |
9fb9cbb1 | 155 | { |
0794935e | 156 | unsigned int n; |
1b8c8a9f | 157 | u32 seed; |
0794935e | 158 | |
141658fb FW |
159 | get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd)); |
160 | ||
0794935e PM |
161 | /* The direction must be ignored, so we hash everything up to the |
162 | * destination ports (which is a multiple of 4) and treat the last | |
163 | * three bytes manually. | |
164 | */ | |
1b8c8a9f | 165 | seed = nf_conntrack_hash_rnd ^ net_hash_mix(net); |
0794935e | 166 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
1b8c8a9f | 167 | return jhash2((u32 *)tuple, n, seed ^ |
99f07e91 CG |
168 | (((__force __u16)tuple->dst.u.all << 16) | |
169 | tuple->dst.protonum)); | |
170 | } | |
171 | ||
56d52d48 | 172 | static u32 scale_hash(u32 hash) |
99f07e91 | 173 | { |
56d52d48 | 174 | return reciprocal_scale(hash, nf_conntrack_htable_size); |
99f07e91 | 175 | } |
0794935e | 176 | |
1b8c8a9f FW |
177 | static u32 __hash_conntrack(const struct net *net, |
178 | const struct nf_conntrack_tuple *tuple, | |
179 | unsigned int size) | |
99f07e91 | 180 | { |
1b8c8a9f | 181 | return reciprocal_scale(hash_conntrack_raw(tuple, net), size); |
9fb9cbb1 YK |
182 | } |
183 | ||
1b8c8a9f FW |
184 | static u32 hash_conntrack(const struct net *net, |
185 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 186 | { |
56d52d48 | 187 | return scale_hash(hash_conntrack_raw(tuple, net)); |
9fb9cbb1 YK |
188 | } |
189 | ||
5f2b4c90 | 190 | bool |
9fb9cbb1 YK |
191 | nf_ct_get_tuple(const struct sk_buff *skb, |
192 | unsigned int nhoff, | |
193 | unsigned int dataoff, | |
194 | u_int16_t l3num, | |
195 | u_int8_t protonum, | |
a31f1adc | 196 | struct net *net, |
9fb9cbb1 YK |
197 | struct nf_conntrack_tuple *tuple, |
198 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 199 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 200 | { |
443a70d5 | 201 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
202 | |
203 | tuple->src.l3num = l3num; | |
204 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 205 | return false; |
9fb9cbb1 YK |
206 | |
207 | tuple->dst.protonum = protonum; | |
208 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
209 | ||
a31f1adc | 210 | return l4proto->pkt_to_tuple(skb, dataoff, net, tuple); |
9fb9cbb1 | 211 | } |
13b18339 | 212 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 213 | |
5f2b4c90 | 214 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
a31f1adc EB |
215 | u_int16_t l3num, |
216 | struct net *net, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
217 | { |
218 | struct nf_conntrack_l3proto *l3proto; | |
219 | struct nf_conntrack_l4proto *l4proto; | |
220 | unsigned int protoff; | |
221 | u_int8_t protonum; | |
222 | int ret; | |
223 | ||
224 | rcu_read_lock(); | |
225 | ||
226 | l3proto = __nf_ct_l3proto_find(l3num); | |
227 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
228 | if (ret != NF_ACCEPT) { | |
229 | rcu_read_unlock(); | |
5f2b4c90 | 230 | return false; |
e2a3123f YK |
231 | } |
232 | ||
233 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
234 | ||
a31f1adc | 235 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple, |
e2a3123f YK |
236 | l3proto, l4proto); |
237 | ||
238 | rcu_read_unlock(); | |
239 | return ret; | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
242 | ||
5f2b4c90 | 243 | bool |
9fb9cbb1 YK |
244 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
245 | const struct nf_conntrack_tuple *orig, | |
246 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 247 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 248 | { |
443a70d5 | 249 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
250 | |
251 | inverse->src.l3num = orig->src.l3num; | |
252 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 253 | return false; |
9fb9cbb1 YK |
254 | |
255 | inverse->dst.dir = !orig->dst.dir; | |
256 | ||
257 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 258 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 259 | } |
13b18339 | 260 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 261 | |
9fb9cbb1 YK |
262 | static void |
263 | clean_from_lists(struct nf_conn *ct) | |
264 | { | |
0d53778e | 265 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
266 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
267 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
268 | |
269 | /* Destroy all pending expectations */ | |
c1d10adb | 270 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
271 | } |
272 | ||
b7779d06 JDB |
273 | /* must be called with local_bh_disable */ |
274 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) | |
275 | { | |
276 | struct ct_pcpu *pcpu; | |
277 | ||
278 | /* add this conntrack to the (per cpu) dying list */ | |
279 | ct->cpu = smp_processor_id(); | |
280 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
281 | ||
282 | spin_lock(&pcpu->lock); | |
283 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
284 | &pcpu->dying); | |
285 | spin_unlock(&pcpu->lock); | |
286 | } | |
287 | ||
288 | /* must be called with local_bh_disable */ | |
289 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) | |
290 | { | |
291 | struct ct_pcpu *pcpu; | |
292 | ||
293 | /* add this conntrack to the (per cpu) unconfirmed list */ | |
294 | ct->cpu = smp_processor_id(); | |
295 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
296 | ||
297 | spin_lock(&pcpu->lock); | |
298 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
299 | &pcpu->unconfirmed); | |
300 | spin_unlock(&pcpu->lock); | |
301 | } | |
302 | ||
303 | /* must be called with local_bh_disable */ | |
304 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) | |
305 | { | |
306 | struct ct_pcpu *pcpu; | |
307 | ||
308 | /* We overload first tuple to link into unconfirmed or dying list.*/ | |
309 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
310 | ||
311 | spin_lock(&pcpu->lock); | |
312 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
313 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
314 | spin_unlock(&pcpu->lock); | |
315 | } | |
316 | ||
0838aa7f | 317 | /* Released via destroy_conntrack() */ |
308ac914 DB |
318 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
319 | const struct nf_conntrack_zone *zone, | |
320 | gfp_t flags) | |
0838aa7f PNA |
321 | { |
322 | struct nf_conn *tmpl; | |
323 | ||
f58e5aa7 | 324 | tmpl = kzalloc(sizeof(*tmpl), flags); |
0838aa7f PNA |
325 | if (tmpl == NULL) |
326 | return NULL; | |
327 | ||
328 | tmpl->status = IPS_TEMPLATE; | |
329 | write_pnet(&tmpl->ct_net, net); | |
330 | ||
5e8018fc DB |
331 | if (nf_ct_zone_add(tmpl, flags, zone) < 0) |
332 | goto out_free; | |
333 | ||
0838aa7f PNA |
334 | atomic_set(&tmpl->ct_general.use, 0); |
335 | ||
336 | return tmpl; | |
0838aa7f PNA |
337 | out_free: |
338 | kfree(tmpl); | |
339 | return NULL; | |
0838aa7f PNA |
340 | } |
341 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); | |
342 | ||
9cf94eab | 343 | void nf_ct_tmpl_free(struct nf_conn *tmpl) |
0838aa7f PNA |
344 | { |
345 | nf_ct_ext_destroy(tmpl); | |
346 | nf_ct_ext_free(tmpl); | |
347 | kfree(tmpl); | |
348 | } | |
9cf94eab | 349 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_free); |
0838aa7f | 350 | |
9fb9cbb1 YK |
351 | static void |
352 | destroy_conntrack(struct nf_conntrack *nfct) | |
353 | { | |
354 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 355 | struct net *net = nf_ct_net(ct); |
605dcad6 | 356 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 357 | |
0d53778e | 358 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 YK |
359 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
360 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
361 | ||
0838aa7f PNA |
362 | if (unlikely(nf_ct_is_template(ct))) { |
363 | nf_ct_tmpl_free(ct); | |
364 | return; | |
365 | } | |
923f4902 | 366 | rcu_read_lock(); |
5e8fbe2a | 367 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
4b4ceb9d | 368 | if (l4proto->destroy) |
605dcad6 | 369 | l4proto->destroy(ct); |
9fb9cbb1 | 370 | |
982d9a9c | 371 | rcu_read_unlock(); |
9fb9cbb1 | 372 | |
ca7433df | 373 | local_bh_disable(); |
9fb9cbb1 YK |
374 | /* Expectations will have been removed in clean_from_lists, |
375 | * except TFTP can create an expectation on the first packet, | |
376 | * before connection is in the list, so we need to clean here, | |
ca7433df JDB |
377 | * too. |
378 | */ | |
c1d10adb | 379 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 380 | |
b7779d06 | 381 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
9fb9cbb1 | 382 | |
0d55af87 | 383 | NF_CT_STAT_INC(net, delete); |
ca7433df | 384 | local_bh_enable(); |
9fb9cbb1 YK |
385 | |
386 | if (ct->master) | |
387 | nf_ct_put(ct->master); | |
388 | ||
0d53778e | 389 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
390 | nf_conntrack_free(ct); |
391 | } | |
392 | ||
02982c27 | 393 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 394 | { |
0d55af87 | 395 | struct net *net = nf_ct_net(ct); |
93bb0ceb | 396 | unsigned int hash, reply_hash; |
93bb0ceb | 397 | unsigned int sequence; |
9fb9cbb1 | 398 | |
9858a3ae | 399 | nf_ct_helper_destroy(ct); |
93bb0ceb JDB |
400 | |
401 | local_bh_disable(); | |
402 | do { | |
a3efd812 | 403 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 404 | hash = hash_conntrack(net, |
93bb0ceb | 405 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 406 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
407 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
408 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
409 | ||
9fb9cbb1 | 410 | clean_from_lists(ct); |
93bb0ceb JDB |
411 | nf_conntrack_double_unlock(hash, reply_hash); |
412 | ||
b7779d06 | 413 | nf_ct_add_to_dying_list(ct); |
93bb0ceb JDB |
414 | |
415 | NF_CT_STAT_INC(net, delete_list); | |
416 | local_bh_enable(); | |
dd7669a9 | 417 | } |
dd7669a9 | 418 | |
02982c27 | 419 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 420 | { |
a992ca2a PNA |
421 | struct nf_conn_tstamp *tstamp; |
422 | ||
423 | tstamp = nf_conn_tstamp_find(ct); | |
424 | if (tstamp && tstamp->stop == 0) | |
d2de875c | 425 | tstamp->stop = ktime_get_real_ns(); |
dd7669a9 | 426 | |
9500507c FW |
427 | if (nf_ct_is_dying(ct)) |
428 | goto delete; | |
429 | ||
430 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, | |
431 | portid, report) < 0) { | |
dd7669a9 PNA |
432 | /* destroy event was not delivered */ |
433 | nf_ct_delete_from_lists(ct); | |
9500507c | 434 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
02982c27 | 435 | return false; |
dd7669a9 | 436 | } |
9500507c FW |
437 | |
438 | nf_conntrack_ecache_work(nf_ct_net(ct)); | |
dd7669a9 | 439 | set_bit(IPS_DYING_BIT, &ct->status); |
9500507c | 440 | delete: |
dd7669a9 | 441 | nf_ct_delete_from_lists(ct); |
9fb9cbb1 | 442 | nf_ct_put(ct); |
02982c27 FW |
443 | return true; |
444 | } | |
445 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
446 | ||
447 | static void death_by_timeout(unsigned long ul_conntrack) | |
448 | { | |
449 | nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0); | |
9fb9cbb1 YK |
450 | } |
451 | ||
c6825c09 AV |
452 | static inline bool |
453 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, | |
308ac914 | 454 | const struct nf_conntrack_tuple *tuple, |
e0c7d472 FW |
455 | const struct nf_conntrack_zone *zone, |
456 | const struct net *net) | |
c6825c09 AV |
457 | { |
458 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
459 | ||
460 | /* A conntrack can be recreated with the equal tuple, | |
461 | * so we need to check that the conntrack is confirmed | |
462 | */ | |
463 | return nf_ct_tuple_equal(tuple, &h->tuple) && | |
deedb590 | 464 | nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) && |
e0c7d472 FW |
465 | nf_ct_is_confirmed(ct) && |
466 | net_eq(net, nf_ct_net(ct)); | |
c6825c09 AV |
467 | } |
468 | ||
ea781f19 ED |
469 | /* |
470 | * Warning : | |
471 | * - Caller must take a reference on returned object | |
472 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
ea781f19 | 473 | */ |
99f07e91 | 474 | static struct nf_conntrack_tuple_hash * |
308ac914 | 475 | ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 476 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
477 | { |
478 | struct nf_conntrack_tuple_hash *h; | |
5e3c61f9 | 479 | struct hlist_nulls_head *ct_hash; |
ea781f19 | 480 | struct hlist_nulls_node *n; |
5e3c61f9 | 481 | unsigned int bucket, sequence; |
9fb9cbb1 | 482 | |
ea781f19 | 483 | begin: |
5e3c61f9 FW |
484 | do { |
485 | sequence = read_seqcount_begin(&nf_conntrack_generation); | |
56d52d48 FW |
486 | bucket = scale_hash(hash); |
487 | ct_hash = nf_conntrack_hash; | |
5e3c61f9 FW |
488 | } while (read_seqcount_retry(&nf_conntrack_generation, sequence)); |
489 | ||
490 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) { | |
e0c7d472 | 491 | if (nf_ct_key_equal(h, tuple, zone, net)) { |
2cf12348 | 492 | NF_CT_STAT_INC_ATOMIC(net, found); |
9fb9cbb1 YK |
493 | return h; |
494 | } | |
2cf12348 | 495 | NF_CT_STAT_INC_ATOMIC(net, searched); |
9fb9cbb1 | 496 | } |
ea781f19 ED |
497 | /* |
498 | * if the nulls value we got at the end of this lookup is | |
499 | * not the expected one, we must restart lookup. | |
500 | * We probably met an item that was moved to another chain. | |
501 | */ | |
99f07e91 | 502 | if (get_nulls_value(n) != bucket) { |
2cf12348 | 503 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
ea781f19 | 504 | goto begin; |
af740b2c | 505 | } |
9fb9cbb1 YK |
506 | |
507 | return NULL; | |
508 | } | |
99f07e91 | 509 | |
9fb9cbb1 | 510 | /* Find a connection corresponding to a tuple. */ |
99f07e91 | 511 | static struct nf_conntrack_tuple_hash * |
308ac914 | 512 | __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 513 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
514 | { |
515 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 516 | struct nf_conn *ct; |
9fb9cbb1 | 517 | |
76507f69 | 518 | rcu_read_lock(); |
ea781f19 | 519 | begin: |
99f07e91 | 520 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
521 | if (h) { |
522 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
523 | if (unlikely(nf_ct_is_dying(ct) || |
524 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 525 | h = NULL; |
ea781f19 | 526 | else { |
e0c7d472 | 527 | if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) { |
ea781f19 ED |
528 | nf_ct_put(ct); |
529 | goto begin; | |
530 | } | |
531 | } | |
76507f69 PM |
532 | } |
533 | rcu_read_unlock(); | |
9fb9cbb1 YK |
534 | |
535 | return h; | |
536 | } | |
99f07e91 CG |
537 | |
538 | struct nf_conntrack_tuple_hash * | |
308ac914 | 539 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 CG |
540 | const struct nf_conntrack_tuple *tuple) |
541 | { | |
542 | return __nf_conntrack_find_get(net, zone, tuple, | |
1b8c8a9f | 543 | hash_conntrack_raw(tuple, net)); |
99f07e91 | 544 | } |
13b18339 | 545 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 546 | |
c1d10adb PNA |
547 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
548 | unsigned int hash, | |
b476b72a | 549 | unsigned int reply_hash) |
c1d10adb | 550 | { |
ea781f19 | 551 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
56d52d48 | 552 | &nf_conntrack_hash[hash]); |
ea781f19 | 553 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
56d52d48 | 554 | &nf_conntrack_hash[reply_hash]); |
c1d10adb PNA |
555 | } |
556 | ||
7d367e06 JK |
557 | int |
558 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 559 | { |
308ac914 | 560 | const struct nf_conntrack_zone *zone; |
d696c7bd | 561 | struct net *net = nf_ct_net(ct); |
b476b72a | 562 | unsigned int hash, reply_hash; |
7d367e06 JK |
563 | struct nf_conntrack_tuple_hash *h; |
564 | struct hlist_nulls_node *n; | |
93bb0ceb | 565 | unsigned int sequence; |
c1d10adb | 566 | |
5d0aa2cc | 567 | zone = nf_ct_zone(ct); |
7d367e06 | 568 | |
93bb0ceb JDB |
569 | local_bh_disable(); |
570 | do { | |
a3efd812 | 571 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 572 | hash = hash_conntrack(net, |
93bb0ceb | 573 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 574 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
575 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
576 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
7d367e06 JK |
577 | |
578 | /* See if there's one in the list already, including reverse */ | |
56d52d48 | 579 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 580 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 581 | zone, net)) |
7d367e06 | 582 | goto out; |
86804348 | 583 | |
56d52d48 | 584 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 585 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 586 | zone, net)) |
7d367e06 | 587 | goto out; |
c1d10adb | 588 | |
7d367e06 | 589 | add_timer(&ct->timeout); |
e53376be PNA |
590 | smp_wmb(); |
591 | /* The caller holds a reference to this object */ | |
592 | atomic_set(&ct->ct_general.use, 2); | |
b476b72a | 593 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 594 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 595 | NF_CT_STAT_INC(net, insert); |
93bb0ceb | 596 | local_bh_enable(); |
7d367e06 JK |
597 | return 0; |
598 | ||
599 | out: | |
93bb0ceb | 600 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 601 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 602 | local_bh_enable(); |
7d367e06 | 603 | return -EEXIST; |
c1d10adb | 604 | } |
7d367e06 | 605 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 606 | |
ba76738c PNA |
607 | static inline void nf_ct_acct_update(struct nf_conn *ct, |
608 | enum ip_conntrack_info ctinfo, | |
609 | unsigned int len) | |
610 | { | |
611 | struct nf_conn_acct *acct; | |
612 | ||
613 | acct = nf_conn_acct_find(ct); | |
614 | if (acct) { | |
615 | struct nf_conn_counter *counter = acct->counter; | |
616 | ||
617 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); | |
618 | atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes); | |
619 | } | |
620 | } | |
621 | ||
71d8c47f PNA |
622 | static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
623 | const struct nf_conn *loser_ct) | |
624 | { | |
625 | struct nf_conn_acct *acct; | |
626 | ||
627 | acct = nf_conn_acct_find(loser_ct); | |
628 | if (acct) { | |
629 | struct nf_conn_counter *counter = acct->counter; | |
71d8c47f PNA |
630 | unsigned int bytes; |
631 | ||
632 | /* u32 should be fine since we must have seen one packet. */ | |
633 | bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes); | |
634 | nf_ct_acct_update(ct, ctinfo, bytes); | |
635 | } | |
636 | } | |
637 | ||
638 | /* Resolve race on insertion if this protocol allows this. */ | |
639 | static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb, | |
640 | enum ip_conntrack_info ctinfo, | |
641 | struct nf_conntrack_tuple_hash *h) | |
642 | { | |
643 | /* This is the conntrack entry already in hashes that won race. */ | |
644 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
645 | struct nf_conntrack_l4proto *l4proto; | |
646 | ||
647 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); | |
648 | if (l4proto->allow_clash && | |
649 | !nf_ct_is_dying(ct) && | |
650 | atomic_inc_not_zero(&ct->ct_general.use)) { | |
651 | nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct); | |
652 | nf_conntrack_put(skb->nfct); | |
653 | /* Assign conntrack already in hashes to this skbuff. Don't | |
654 | * modify skb->nfctinfo to ensure consistent stateful filtering. | |
655 | */ | |
656 | skb->nfct = &ct->ct_general; | |
657 | return NF_ACCEPT; | |
658 | } | |
659 | NF_CT_STAT_INC(net, drop); | |
660 | return NF_DROP; | |
661 | } | |
662 | ||
9fb9cbb1 YK |
663 | /* Confirm a connection given skb; places it in hash table */ |
664 | int | |
3db05fea | 665 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 | 666 | { |
308ac914 | 667 | const struct nf_conntrack_zone *zone; |
b476b72a | 668 | unsigned int hash, reply_hash; |
df0933dc | 669 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 670 | struct nf_conn *ct; |
df0933dc | 671 | struct nf_conn_help *help; |
a992ca2a | 672 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 673 | struct hlist_nulls_node *n; |
9fb9cbb1 | 674 | enum ip_conntrack_info ctinfo; |
400dad39 | 675 | struct net *net; |
93bb0ceb | 676 | unsigned int sequence; |
71d8c47f | 677 | int ret = NF_DROP; |
9fb9cbb1 | 678 | |
3db05fea | 679 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 680 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
681 | |
682 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
683 | ICMP/TCP RST packets in other direction. Actual packet | |
684 | which created connection will be IP_CT_NEW or for an | |
685 | expected connection, IP_CT_RELATED. */ | |
686 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
687 | return NF_ACCEPT; | |
688 | ||
5d0aa2cc | 689 | zone = nf_ct_zone(ct); |
93bb0ceb JDB |
690 | local_bh_disable(); |
691 | ||
692 | do { | |
a3efd812 | 693 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb JDB |
694 | /* reuse the hash saved before */ |
695 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
56d52d48 | 696 | hash = scale_hash(hash); |
deedb590 | 697 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
698 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
699 | ||
700 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
9fb9cbb1 YK |
701 | |
702 | /* We're not in hash table, and we refuse to set up related | |
93bb0ceb JDB |
703 | * connections for unconfirmed conns. But packet copies and |
704 | * REJECT will give spurious warnings here. | |
705 | */ | |
9fb9cbb1 YK |
706 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
707 | ||
25985edc | 708 | /* No external references means no one else could have |
93bb0ceb JDB |
709 | * confirmed us. |
710 | */ | |
9fb9cbb1 | 711 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
0d53778e | 712 | pr_debug("Confirming conntrack %p\n", ct); |
8ca3f5e9 PNA |
713 | /* We have to check the DYING flag after unlink to prevent |
714 | * a race against nf_ct_get_next_corpse() possibly called from | |
715 | * user context, else we insert an already 'dead' hash, blocking | |
716 | * further use of that particular connection -JM. | |
717 | */ | |
718 | nf_ct_del_from_dying_or_unconfirmed_list(ct); | |
719 | ||
71d8c47f PNA |
720 | if (unlikely(nf_ct_is_dying(ct))) { |
721 | nf_ct_add_to_dying_list(ct); | |
722 | goto dying; | |
723 | } | |
fc350777 | 724 | |
9fb9cbb1 YK |
725 | /* See if there's one in the list already, including reverse: |
726 | NAT could have grabbed it without realizing, since we're | |
727 | not in the hash. If there is, we lost race. */ | |
56d52d48 | 728 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 729 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 730 | zone, net)) |
df0933dc | 731 | goto out; |
86804348 | 732 | |
56d52d48 | 733 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 734 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 735 | zone, net)) |
df0933dc | 736 | goto out; |
9fb9cbb1 | 737 | |
df0933dc PM |
738 | /* Timer relative to confirmation time, not original |
739 | setting time, otherwise we'd get timer wrap in | |
740 | weird delay cases. */ | |
741 | ct->timeout.expires += jiffies; | |
742 | add_timer(&ct->timeout); | |
743 | atomic_inc(&ct->ct_general.use); | |
45eec341 | 744 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 745 | |
a992ca2a PNA |
746 | /* set conntrack timestamp, if enabled. */ |
747 | tstamp = nf_conn_tstamp_find(ct); | |
748 | if (tstamp) { | |
749 | if (skb->tstamp.tv64 == 0) | |
e3192690 | 750 | __net_timestamp(skb); |
a992ca2a PNA |
751 | |
752 | tstamp->start = ktime_to_ns(skb->tstamp); | |
753 | } | |
5c8ec910 PM |
754 | /* Since the lookup is lockless, hash insertion must be done after |
755 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
756 | * guarantee that no other CPU can find the conntrack before the above | |
757 | * stores are visible. | |
758 | */ | |
b476b72a | 759 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 760 | nf_conntrack_double_unlock(hash, reply_hash); |
0d55af87 | 761 | NF_CT_STAT_INC(net, insert); |
93bb0ceb | 762 | local_bh_enable(); |
5c8ec910 | 763 | |
df0933dc PM |
764 | help = nfct_help(ct); |
765 | if (help && help->helper) | |
a71996fc | 766 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 767 | |
df0933dc | 768 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 769 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 770 | return NF_ACCEPT; |
9fb9cbb1 | 771 | |
df0933dc | 772 | out: |
8ca3f5e9 | 773 | nf_ct_add_to_dying_list(ct); |
71d8c47f PNA |
774 | ret = nf_ct_resolve_clash(net, skb, ctinfo, h); |
775 | dying: | |
93bb0ceb | 776 | nf_conntrack_double_unlock(hash, reply_hash); |
0d55af87 | 777 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 778 | local_bh_enable(); |
71d8c47f | 779 | return ret; |
9fb9cbb1 | 780 | } |
13b18339 | 781 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
782 | |
783 | /* Returns true if a connection correspondings to the tuple (required | |
784 | for NAT). */ | |
785 | int | |
786 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
787 | const struct nf_conn *ignored_conntrack) | |
788 | { | |
400dad39 | 789 | struct net *net = nf_ct_net(ignored_conntrack); |
308ac914 | 790 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 | 791 | struct nf_conntrack_tuple_hash *h; |
5e3c61f9 FW |
792 | struct hlist_nulls_head *ct_hash; |
793 | unsigned int hash, sequence; | |
ea781f19 | 794 | struct hlist_nulls_node *n; |
5d0aa2cc | 795 | struct nf_conn *ct; |
308ac914 DB |
796 | |
797 | zone = nf_ct_zone(ignored_conntrack); | |
9fb9cbb1 | 798 | |
2cf12348 | 799 | rcu_read_lock(); |
5e3c61f9 FW |
800 | do { |
801 | sequence = read_seqcount_begin(&nf_conntrack_generation); | |
802 | hash = hash_conntrack(net, tuple); | |
56d52d48 | 803 | ct_hash = nf_conntrack_hash; |
5e3c61f9 FW |
804 | } while (read_seqcount_retry(&nf_conntrack_generation, sequence)); |
805 | ||
806 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) { | |
5d0aa2cc PM |
807 | ct = nf_ct_tuplehash_to_ctrack(h); |
808 | if (ct != ignored_conntrack && | |
e0c7d472 | 809 | nf_ct_key_equal(h, tuple, zone, net)) { |
2cf12348 FW |
810 | NF_CT_STAT_INC_ATOMIC(net, found); |
811 | rcu_read_unlock(); | |
ba419aff PM |
812 | return 1; |
813 | } | |
2cf12348 | 814 | NF_CT_STAT_INC_ATOMIC(net, searched); |
ba419aff | 815 | } |
2cf12348 | 816 | rcu_read_unlock(); |
9fb9cbb1 | 817 | |
ba419aff | 818 | return 0; |
9fb9cbb1 | 819 | } |
13b18339 | 820 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 821 | |
7ae7730f PM |
822 | #define NF_CT_EVICTION_RANGE 8 |
823 | ||
9fb9cbb1 YK |
824 | /* There's a small race here where we may free a just-assured |
825 | connection. Too bad: we're in trouble anyway. */ | |
93bb0ceb | 826 | static noinline int early_drop(struct net *net, unsigned int _hash) |
9fb9cbb1 | 827 | { |
f205c5e0 | 828 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 829 | struct nf_conntrack_tuple_hash *h; |
3e86638e | 830 | struct nf_conn *tmp; |
ea781f19 | 831 | struct hlist_nulls_node *n; |
3e86638e FW |
832 | unsigned int i, hash, sequence; |
833 | struct nf_conn *ct = NULL; | |
93bb0ceb | 834 | spinlock_t *lockp; |
3e86638e FW |
835 | bool ret = false; |
836 | ||
837 | i = 0; | |
9fb9cbb1 | 838 | |
93bb0ceb JDB |
839 | local_bh_disable(); |
840 | restart: | |
a3efd812 | 841 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
3e86638e FW |
842 | for (; i < NF_CT_EVICTION_RANGE; i++) { |
843 | hash = scale_hash(_hash++); | |
93bb0ceb | 844 | lockp = &nf_conntrack_locks[hash % CONNTRACK_LOCKS]; |
b16c2919 | 845 | nf_conntrack_lock(lockp); |
a3efd812 | 846 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
93bb0ceb JDB |
847 | spin_unlock(lockp); |
848 | goto restart; | |
849 | } | |
56d52d48 FW |
850 | hlist_nulls_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], |
851 | hnnode) { | |
7ae7730f | 852 | tmp = nf_ct_tuplehash_to_ctrack(h); |
3e86638e FW |
853 | |
854 | if (test_bit(IPS_ASSURED_BIT, &tmp->status) || | |
855 | !net_eq(nf_ct_net(tmp), net) || | |
856 | nf_ct_is_dying(tmp)) | |
857 | continue; | |
858 | ||
859 | if (atomic_inc_not_zero(&tmp->ct_general.use)) { | |
7ae7730f | 860 | ct = tmp; |
93bb0ceb JDB |
861 | break; |
862 | } | |
7ae7730f | 863 | } |
76507f69 | 864 | |
93bb0ceb | 865 | spin_unlock(lockp); |
3e86638e | 866 | if (ct) |
7ae7730f | 867 | break; |
9fb9cbb1 | 868 | } |
3e86638e | 869 | |
93bb0ceb | 870 | local_bh_enable(); |
9fb9cbb1 YK |
871 | |
872 | if (!ct) | |
3e86638e | 873 | return false; |
9fb9cbb1 | 874 | |
3e86638e FW |
875 | /* kill only if in same netns -- might have moved due to |
876 | * SLAB_DESTROY_BY_RCU rules | |
877 | */ | |
878 | if (net_eq(nf_ct_net(ct), net) && del_timer(&ct->timeout)) { | |
02982c27 | 879 | if (nf_ct_delete(ct, 0, 0)) { |
74138511 | 880 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
3e86638e | 881 | ret = true; |
74138511 | 882 | } |
9fb9cbb1 | 883 | } |
3e86638e | 884 | |
9fb9cbb1 | 885 | nf_ct_put(ct); |
3e86638e | 886 | return ret; |
9fb9cbb1 YK |
887 | } |
888 | ||
99f07e91 | 889 | static struct nf_conn * |
308ac914 DB |
890 | __nf_conntrack_alloc(struct net *net, |
891 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
892 | const struct nf_conntrack_tuple *orig, |
893 | const struct nf_conntrack_tuple *repl, | |
894 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 895 | { |
cd7fcbf1 | 896 | struct nf_conn *ct; |
9fb9cbb1 | 897 | |
5251e2d2 | 898 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 899 | atomic_inc(&net->ct.count); |
5251e2d2 | 900 | |
76eb9460 | 901 | if (nf_conntrack_max && |
49ac8713 | 902 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
93bb0ceb | 903 | if (!early_drop(net, hash)) { |
49ac8713 | 904 | atomic_dec(&net->ct.count); |
e87cc472 | 905 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
906 | return ERR_PTR(-ENOMEM); |
907 | } | |
908 | } | |
909 | ||
941297f4 ED |
910 | /* |
911 | * Do not use kmem_cache_zalloc(), as this cache uses | |
912 | * SLAB_DESTROY_BY_RCU. | |
913 | */ | |
0c5366b3 | 914 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); |
5e8018fc DB |
915 | if (ct == NULL) |
916 | goto out; | |
917 | ||
440f0d58 | 918 | spin_lock_init(&ct->lock); |
c88130bc | 919 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 920 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 921 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
922 | /* save hash for reusing when confirming */ |
923 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
c41884ce | 924 | ct->status = 0; |
9fb9cbb1 | 925 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 926 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9b | 927 | write_pnet(&ct->ct_net, net); |
c41884ce FW |
928 | memset(&ct->__nfct_init_offset[0], 0, |
929 | offsetof(struct nf_conn, proto) - | |
930 | offsetof(struct nf_conn, __nfct_init_offset[0])); | |
5e8018fc DB |
931 | |
932 | if (zone && nf_ct_zone_add(ct, GFP_ATOMIC, zone) < 0) | |
933 | goto out_free; | |
934 | ||
e53376be PNA |
935 | /* Because we use RCU lookups, we set ct_general.use to zero before |
936 | * this is inserted in any list. | |
941297f4 | 937 | */ |
e53376be | 938 | atomic_set(&ct->ct_general.use, 0); |
c88130bc | 939 | return ct; |
5d0aa2cc | 940 | out_free: |
0c5366b3 | 941 | kmem_cache_free(nf_conntrack_cachep, ct); |
5e8018fc DB |
942 | out: |
943 | atomic_dec(&net->ct.count); | |
5d0aa2cc | 944 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 945 | } |
99f07e91 | 946 | |
308ac914 DB |
947 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
948 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
949 | const struct nf_conntrack_tuple *orig, |
950 | const struct nf_conntrack_tuple *repl, | |
951 | gfp_t gfp) | |
952 | { | |
953 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
954 | } | |
13b18339 | 955 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 956 | |
c88130bc | 957 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 958 | { |
1d45209d ED |
959 | struct net *net = nf_ct_net(ct); |
960 | ||
e53376be PNA |
961 | /* A freed object has refcnt == 0, that's |
962 | * the golden rule for SLAB_DESTROY_BY_RCU | |
963 | */ | |
964 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); | |
965 | ||
ceeff754 | 966 | nf_ct_ext_destroy(ct); |
ea781f19 | 967 | nf_ct_ext_free(ct); |
0c5366b3 | 968 | kmem_cache_free(nf_conntrack_cachep, ct); |
4e857c58 | 969 | smp_mb__before_atomic(); |
0c3c6c00 | 970 | atomic_dec(&net->ct.count); |
76507f69 | 971 | } |
13b18339 | 972 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 973 | |
c539f017 | 974 | |
9fb9cbb1 YK |
975 | /* Allocate a new conntrack: we return -ENOMEM if classification |
976 | failed due to stress. Otherwise it really is unclassifiable. */ | |
977 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 978 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 979 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 980 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 981 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 982 | struct sk_buff *skb, |
60b5f8f7 | 983 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 984 | { |
c88130bc | 985 | struct nf_conn *ct; |
3c158f7f | 986 | struct nf_conn_help *help; |
9fb9cbb1 | 987 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 988 | struct nf_conntrack_ecache *ecache; |
ca7433df | 989 | struct nf_conntrack_expect *exp = NULL; |
308ac914 | 990 | const struct nf_conntrack_zone *zone; |
60b5f8f7 | 991 | struct nf_conn_timeout *timeout_ext; |
5e8018fc | 992 | struct nf_conntrack_zone tmp; |
60b5f8f7 | 993 | unsigned int *timeouts; |
9fb9cbb1 | 994 | |
605dcad6 | 995 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 996 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
997 | return NULL; |
998 | } | |
999 | ||
5e8018fc | 1000 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
99f07e91 CG |
1001 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
1002 | hash); | |
0a9ee813 | 1003 | if (IS_ERR(ct)) |
c88130bc | 1004 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 1005 | |
48b1de4c PM |
1006 | if (tmpl && nfct_synproxy(tmpl)) { |
1007 | nfct_seqadj_ext_add(ct); | |
1008 | nfct_synproxy_ext_add(ct); | |
1009 | } | |
1010 | ||
60b5f8f7 | 1011 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
ae2d708e PNA |
1012 | if (timeout_ext) { |
1013 | timeouts = nf_ct_timeout_data(timeout_ext); | |
1014 | if (unlikely(!timeouts)) | |
1015 | timeouts = l4proto->get_timeouts(net); | |
1016 | } else { | |
60b5f8f7 | 1017 | timeouts = l4proto->get_timeouts(net); |
ae2d708e | 1018 | } |
60b5f8f7 | 1019 | |
2c8503f5 | 1020 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 1021 | nf_conntrack_free(ct); |
ccd63c20 | 1022 | pr_debug("can't track with proto module\n"); |
9fb9cbb1 YK |
1023 | return NULL; |
1024 | } | |
1025 | ||
60b5f8f7 | 1026 | if (timeout_ext) |
ae2d708e PNA |
1027 | nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout), |
1028 | GFP_ATOMIC); | |
60b5f8f7 | 1029 | |
58401572 | 1030 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 1031 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 1032 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
1033 | |
1034 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
1035 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
1036 | ecache ? ecache->expmask : 0, | |
1037 | GFP_ATOMIC); | |
58401572 | 1038 | |
ca7433df JDB |
1039 | local_bh_disable(); |
1040 | if (net->ct.expect_count) { | |
1041 | spin_lock(&nf_conntrack_expect_lock); | |
1042 | exp = nf_ct_find_expectation(net, zone, tuple); | |
1043 | if (exp) { | |
ccd63c20 | 1044 | pr_debug("expectation arrives ct=%p exp=%p\n", |
ca7433df JDB |
1045 | ct, exp); |
1046 | /* Welcome, Mr. Bond. We've been expecting you... */ | |
1047 | __set_bit(IPS_EXPECTED_BIT, &ct->status); | |
1048 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ | |
1049 | ct->master = exp->master; | |
1050 | if (exp->helper) { | |
1051 | help = nf_ct_helper_ext_add(ct, exp->helper, | |
1052 | GFP_ATOMIC); | |
1053 | if (help) | |
1054 | rcu_assign_pointer(help->helper, exp->helper); | |
1055 | } | |
ceceae1b | 1056 | |
9fb9cbb1 | 1057 | #ifdef CONFIG_NF_CONNTRACK_MARK |
ca7433df | 1058 | ct->mark = exp->master->mark; |
7c9728c3 JM |
1059 | #endif |
1060 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
ca7433df | 1061 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 1062 | #endif |
ca7433df JDB |
1063 | NF_CT_STAT_INC(net, expect_new); |
1064 | } | |
1065 | spin_unlock(&nf_conntrack_expect_lock); | |
1066 | } | |
1067 | if (!exp) { | |
b2a15a60 | 1068 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af87 | 1069 | NF_CT_STAT_INC(net, new); |
22e7410b | 1070 | } |
9fb9cbb1 | 1071 | |
e53376be PNA |
1072 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
1073 | nf_conntrack_get(&ct->ct_general); | |
b7779d06 | 1074 | nf_ct_add_to_unconfirmed_list(ct); |
9fb9cbb1 | 1075 | |
ca7433df | 1076 | local_bh_enable(); |
9fb9cbb1 YK |
1077 | |
1078 | if (exp) { | |
1079 | if (exp->expectfn) | |
c88130bc | 1080 | exp->expectfn(ct, exp); |
6823645d | 1081 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
1082 | } |
1083 | ||
c88130bc | 1084 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
1085 | } |
1086 | ||
1087 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
1088 | static inline struct nf_conn * | |
b2a15a60 | 1089 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 1090 | struct sk_buff *skb, |
9fb9cbb1 YK |
1091 | unsigned int dataoff, |
1092 | u_int16_t l3num, | |
1093 | u_int8_t protonum, | |
1094 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 1095 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 1096 | int *set_reply, |
60b5f8f7 | 1097 | enum ip_conntrack_info *ctinfo) |
9fb9cbb1 | 1098 | { |
308ac914 | 1099 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 YK |
1100 | struct nf_conntrack_tuple tuple; |
1101 | struct nf_conntrack_tuple_hash *h; | |
5e8018fc | 1102 | struct nf_conntrack_zone tmp; |
9fb9cbb1 | 1103 | struct nf_conn *ct; |
99f07e91 | 1104 | u32 hash; |
9fb9cbb1 | 1105 | |
bbe735e4 | 1106 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
a31f1adc | 1107 | dataoff, l3num, protonum, net, &tuple, l3proto, |
605dcad6 | 1108 | l4proto)) { |
ccd63c20 | 1109 | pr_debug("Can't get tuple\n"); |
9fb9cbb1 YK |
1110 | return NULL; |
1111 | } | |
1112 | ||
1113 | /* look for tuple match */ | |
5e8018fc | 1114 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
1b8c8a9f | 1115 | hash = hash_conntrack_raw(&tuple, net); |
99f07e91 | 1116 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
9fb9cbb1 | 1117 | if (!h) { |
b2a15a60 | 1118 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 1119 | skb, dataoff, hash); |
9fb9cbb1 YK |
1120 | if (!h) |
1121 | return NULL; | |
1122 | if (IS_ERR(h)) | |
1123 | return (void *)h; | |
1124 | } | |
1125 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1126 | ||
1127 | /* It exists; we have (non-exclusive) reference. */ | |
1128 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fb048833 | 1129 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
1130 | /* Please set reply bit if this packet OK */ |
1131 | *set_reply = 1; | |
1132 | } else { | |
1133 | /* Once we've had two way comms, always ESTABLISHED. */ | |
1134 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
ccd63c20 | 1135 | pr_debug("normal packet for %p\n", ct); |
9fb9cbb1 YK |
1136 | *ctinfo = IP_CT_ESTABLISHED; |
1137 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
ccd63c20 | 1138 | pr_debug("related packet for %p\n", ct); |
9fb9cbb1 YK |
1139 | *ctinfo = IP_CT_RELATED; |
1140 | } else { | |
ccd63c20 | 1141 | pr_debug("new packet for %p\n", ct); |
9fb9cbb1 YK |
1142 | *ctinfo = IP_CT_NEW; |
1143 | } | |
1144 | *set_reply = 0; | |
1145 | } | |
1146 | skb->nfct = &ct->ct_general; | |
1147 | skb->nfctinfo = *ctinfo; | |
1148 | return ct; | |
1149 | } | |
1150 | ||
1151 | unsigned int | |
a702a65f AD |
1152 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
1153 | struct sk_buff *skb) | |
9fb9cbb1 | 1154 | { |
b2a15a60 | 1155 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
1156 | enum ip_conntrack_info ctinfo; |
1157 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 1158 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 1159 | unsigned int *timeouts; |
9fb9cbb1 YK |
1160 | unsigned int dataoff; |
1161 | u_int8_t protonum; | |
1162 | int set_reply = 0; | |
1163 | int ret; | |
1164 | ||
3db05fea | 1165 | if (skb->nfct) { |
b2a15a60 PM |
1166 | /* Previously seen (loopback or untracked)? Ignore. */ |
1167 | tmpl = (struct nf_conn *)skb->nfct; | |
1168 | if (!nf_ct_is_template(tmpl)) { | |
1169 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
1170 | return NF_ACCEPT; | |
1171 | } | |
1172 | skb->nfct = NULL; | |
9fb9cbb1 YK |
1173 | } |
1174 | ||
923f4902 | 1175 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 1176 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 1177 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
1178 | &dataoff, &protonum); |
1179 | if (ret <= 0) { | |
25985edc | 1180 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
1181 | NF_CT_STAT_INC_ATOMIC(net, error); |
1182 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1183 | ret = -ret; |
1184 | goto out; | |
9fb9cbb1 YK |
1185 | } |
1186 | ||
76108cea | 1187 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
1188 | |
1189 | /* It may be an special packet, error, unclean... | |
1190 | * inverse of the return code tells to the netfilter | |
1191 | * core what to do with the packet. */ | |
74c51a14 | 1192 | if (l4proto->error != NULL) { |
8fea97ec PM |
1193 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
1194 | pf, hooknum); | |
74c51a14 | 1195 | if (ret <= 0) { |
0d55af87 AD |
1196 | NF_CT_STAT_INC_ATOMIC(net, error); |
1197 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1198 | ret = -ret; |
1199 | goto out; | |
74c51a14 | 1200 | } |
88ed01d1 PNA |
1201 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
1202 | if (skb->nfct) | |
1203 | goto out; | |
9fb9cbb1 YK |
1204 | } |
1205 | ||
b2a15a60 | 1206 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
60b5f8f7 | 1207 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
1208 | if (!ct) { |
1209 | /* Not valid part of a connection */ | |
0d55af87 | 1210 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
1211 | ret = NF_ACCEPT; |
1212 | goto out; | |
9fb9cbb1 YK |
1213 | } |
1214 | ||
1215 | if (IS_ERR(ct)) { | |
1216 | /* Too stressed to deal. */ | |
0d55af87 | 1217 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
1218 | ret = NF_DROP; |
1219 | goto out; | |
9fb9cbb1 YK |
1220 | } |
1221 | ||
3db05fea | 1222 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 1223 | |
60b5f8f7 | 1224 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1225 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1226 | |
2c8503f5 | 1227 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1228 | if (ret <= 0) { |
9fb9cbb1 YK |
1229 | /* Invalid: inverse of the return code tells |
1230 | * the netfilter core what to do */ | |
0d53778e | 1231 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
1232 | nf_conntrack_put(skb->nfct); |
1233 | skb->nfct = NULL; | |
0d55af87 | 1234 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1235 | if (ret == -NF_DROP) |
1236 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
1237 | ret = -ret; |
1238 | goto out; | |
9fb9cbb1 YK |
1239 | } |
1240 | ||
1241 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1242 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1243 | out: |
c3174286 PNA |
1244 | if (tmpl) { |
1245 | /* Special case: we have to repeat this hook, assign the | |
1246 | * template again to this packet. We assume that this packet | |
1247 | * has no conntrack assigned. This is used by nf_ct_tcp. */ | |
1248 | if (ret == NF_REPEAT) | |
1249 | skb->nfct = (struct nf_conntrack *)tmpl; | |
1250 | else | |
1251 | nf_ct_put(tmpl); | |
1252 | } | |
9fb9cbb1 YK |
1253 | |
1254 | return ret; | |
1255 | } | |
13b18339 | 1256 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1257 | |
5f2b4c90 JE |
1258 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1259 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1260 | { |
5f2b4c90 | 1261 | bool ret; |
923f4902 PM |
1262 | |
1263 | rcu_read_lock(); | |
1264 | ret = nf_ct_invert_tuple(inverse, orig, | |
1265 | __nf_ct_l3proto_find(orig->src.l3num), | |
1266 | __nf_ct_l4proto_find(orig->src.l3num, | |
1267 | orig->dst.protonum)); | |
1268 | rcu_read_unlock(); | |
1269 | return ret; | |
9fb9cbb1 | 1270 | } |
13b18339 | 1271 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1272 | |
5b1158e9 JK |
1273 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1274 | implicitly racy: see __nf_conntrack_confirm */ | |
1275 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1276 | const struct nf_conntrack_tuple *newreply) | |
1277 | { | |
1278 | struct nf_conn_help *help = nfct_help(ct); | |
1279 | ||
5b1158e9 JK |
1280 | /* Should be unconfirmed, so not in hash table yet */ |
1281 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1282 | ||
0d53778e | 1283 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1284 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1285 | |
1286 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1287 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1288 | return; |
ceceae1b | 1289 | |
c52fbb41 | 1290 | rcu_read_lock(); |
b2a15a60 | 1291 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1292 | rcu_read_unlock(); |
5b1158e9 | 1293 | } |
13b18339 | 1294 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1295 | |
9fb9cbb1 YK |
1296 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1297 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1298 | enum ip_conntrack_info ctinfo, | |
1299 | const struct sk_buff *skb, | |
1300 | unsigned long extra_jiffies, | |
1301 | int do_acct) | |
1302 | { | |
9fb9cbb1 YK |
1303 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
1304 | NF_CT_ASSERT(skb); | |
1305 | ||
997ae831 | 1306 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1307 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1308 | goto acct; | |
997ae831 | 1309 | |
9fb9cbb1 YK |
1310 | /* If not in hash table, timer will not be active yet */ |
1311 | if (!nf_ct_is_confirmed(ct)) { | |
1312 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 1313 | } else { |
be00c8e4 MJ |
1314 | unsigned long newtime = jiffies + extra_jiffies; |
1315 | ||
1316 | /* Only update the timeout if the new timeout is at least | |
1317 | HZ jiffies from the old timeout. Need del_timer for race | |
1318 | avoidance (may already be dying). */ | |
65cb9fda PM |
1319 | if (newtime - ct->timeout.expires >= HZ) |
1320 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
1321 | } |
1322 | ||
47d95045 | 1323 | acct: |
ba76738c PNA |
1324 | if (do_acct) |
1325 | nf_ct_acct_update(ct, ctinfo, skb->len); | |
9fb9cbb1 | 1326 | } |
13b18339 | 1327 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1328 | |
4c889498 DM |
1329 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
1330 | enum ip_conntrack_info ctinfo, | |
1331 | const struct sk_buff *skb, | |
1332 | int do_acct) | |
51091764 | 1333 | { |
ba76738c PNA |
1334 | if (do_acct) |
1335 | nf_ct_acct_update(ct, ctinfo, skb->len); | |
58401572 | 1336 | |
4c889498 | 1337 | if (del_timer(&ct->timeout)) { |
51091764 | 1338 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
1339 | return true; |
1340 | } | |
1341 | return false; | |
51091764 | 1342 | } |
718d4ad9 | 1343 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 1344 | |
5d0aa2cc PM |
1345 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1346 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { | |
1347 | .len = sizeof(struct nf_conntrack_zone), | |
1348 | .align = __alignof__(struct nf_conntrack_zone), | |
1349 | .id = NF_CT_EXT_ZONE, | |
1350 | }; | |
1351 | #endif | |
1352 | ||
c0cd1156 | 1353 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1354 | |
1355 | #include <linux/netfilter/nfnetlink.h> | |
1356 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1357 | #include <linux/mutex.h> |
1358 | ||
c1d10adb PNA |
1359 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1360 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1361 | * or depend on ctnetlink */ | |
fdf70832 | 1362 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1363 | const struct nf_conntrack_tuple *tuple) |
1364 | { | |
bae65be8 DM |
1365 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1366 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1367 | goto nla_put_failure; | |
c1d10adb PNA |
1368 | return 0; |
1369 | ||
df6fb868 | 1370 | nla_put_failure: |
c1d10adb PNA |
1371 | return -1; |
1372 | } | |
fdf70832 | 1373 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1374 | |
f73e924c PM |
1375 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1376 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1377 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1378 | }; |
f73e924c | 1379 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1380 | |
fdf70832 | 1381 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1382 | struct nf_conntrack_tuple *t) |
1383 | { | |
df6fb868 | 1384 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1385 | return -EINVAL; |
1386 | ||
77236b6e PM |
1387 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1388 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1389 | |
1390 | return 0; | |
1391 | } | |
fdf70832 | 1392 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1393 | |
1394 | int nf_ct_port_nlattr_tuple_size(void) | |
1395 | { | |
1396 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1399 | #endif |
1400 | ||
9fb9cbb1 | 1401 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1402 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1403 | { |
1404 | struct nf_conn *ct; | |
1405 | enum ip_conntrack_info ctinfo; | |
1406 | ||
1407 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1408 | ct = nf_ct_get(skb, &ctinfo); | |
1409 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1410 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1411 | else |
1412 | ctinfo = IP_CT_RELATED; | |
1413 | ||
1414 | /* Attach to new skbuff, and increment count */ | |
1415 | nskb->nfct = &ct->ct_general; | |
1416 | nskb->nfctinfo = ctinfo; | |
1417 | nf_conntrack_get(nskb->nfct); | |
1418 | } | |
1419 | ||
9fb9cbb1 | 1420 | /* Bring out ya dead! */ |
df0933dc | 1421 | static struct nf_conn * |
400dad39 | 1422 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1423 | void *data, unsigned int *bucket) |
1424 | { | |
df0933dc PM |
1425 | struct nf_conntrack_tuple_hash *h; |
1426 | struct nf_conn *ct; | |
ea781f19 | 1427 | struct hlist_nulls_node *n; |
b7779d06 | 1428 | int cpu; |
93bb0ceb | 1429 | spinlock_t *lockp; |
9fb9cbb1 | 1430 | |
56d52d48 | 1431 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
93bb0ceb JDB |
1432 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
1433 | local_bh_disable(); | |
b16c2919 | 1434 | nf_conntrack_lock(lockp); |
56d52d48 FW |
1435 | if (*bucket < nf_conntrack_htable_size) { |
1436 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) { | |
93bb0ceb JDB |
1437 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1438 | continue; | |
1439 | ct = nf_ct_tuplehash_to_ctrack(h); | |
e0c7d472 FW |
1440 | if (net_eq(nf_ct_net(ct), net) && |
1441 | iter(ct, data)) | |
93bb0ceb JDB |
1442 | goto found; |
1443 | } | |
df0933dc | 1444 | } |
93bb0ceb JDB |
1445 | spin_unlock(lockp); |
1446 | local_bh_enable(); | |
d93c6258 | 1447 | cond_resched(); |
601e68e1 | 1448 | } |
b7779d06 JDB |
1449 | |
1450 | for_each_possible_cpu(cpu) { | |
1451 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1452 | ||
1453 | spin_lock_bh(&pcpu->lock); | |
1454 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { | |
1455 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1456 | if (iter(ct, data)) | |
1457 | set_bit(IPS_DYING_BIT, &ct->status); | |
1458 | } | |
1459 | spin_unlock_bh(&pcpu->lock); | |
d93c6258 | 1460 | cond_resched(); |
b7779d06 | 1461 | } |
df0933dc PM |
1462 | return NULL; |
1463 | found: | |
c073e3fa | 1464 | atomic_inc(&ct->ct_general.use); |
93bb0ceb JDB |
1465 | spin_unlock(lockp); |
1466 | local_bh_enable(); | |
df0933dc | 1467 | return ct; |
9fb9cbb1 YK |
1468 | } |
1469 | ||
400dad39 AD |
1470 | void nf_ct_iterate_cleanup(struct net *net, |
1471 | int (*iter)(struct nf_conn *i, void *data), | |
c655bc68 | 1472 | void *data, u32 portid, int report) |
9fb9cbb1 | 1473 | { |
df0933dc | 1474 | struct nf_conn *ct; |
9fb9cbb1 YK |
1475 | unsigned int bucket = 0; |
1476 | ||
d93c6258 FW |
1477 | might_sleep(); |
1478 | ||
88b68bc5 FW |
1479 | if (atomic_read(&net->ct.count) == 0) |
1480 | return; | |
1481 | ||
400dad39 | 1482 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1483 | /* Time to push up daises... */ |
1484 | if (del_timer(&ct->timeout)) | |
c655bc68 | 1485 | nf_ct_delete(ct, portid, report); |
02982c27 | 1486 | |
9fb9cbb1 YK |
1487 | /* ... else the timer will get him soon. */ |
1488 | ||
1489 | nf_ct_put(ct); | |
d93c6258 | 1490 | cond_resched(); |
9fb9cbb1 YK |
1491 | } |
1492 | } | |
13b18339 | 1493 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1494 | |
274d383b PNA |
1495 | static int kill_all(struct nf_conn *i, void *data) |
1496 | { | |
1497 | return 1; | |
1498 | } | |
1499 | ||
d862a662 | 1500 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1501 | { |
d862a662 | 1502 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1503 | vfree(hash); |
1504 | else | |
601e68e1 | 1505 | free_pages((unsigned long)hash, |
f205c5e0 | 1506 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1507 | } |
ac565e5f | 1508 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1509 | |
b3c5163f ED |
1510 | static int untrack_refs(void) |
1511 | { | |
1512 | int cnt = 0, cpu; | |
1513 | ||
1514 | for_each_possible_cpu(cpu) { | |
1515 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1516 | ||
1517 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1518 | } | |
1519 | return cnt; | |
1520 | } | |
1521 | ||
f94161c1 | 1522 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1523 | { |
f94161c1 G |
1524 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1525 | } | |
1526 | ||
1527 | void nf_conntrack_cleanup_end(void) | |
1528 | { | |
1529 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1530 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1531 | schedule(); |
1532 | ||
56d52d48 FW |
1533 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
1534 | ||
5d0aa2cc PM |
1535 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1536 | nf_ct_extend_unregister(&nf_ct_zone_extend); | |
1537 | #endif | |
04d87001 | 1538 | nf_conntrack_proto_fini(); |
41d73ec0 | 1539 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 1540 | nf_conntrack_labels_fini(); |
5e615b22 | 1541 | nf_conntrack_helper_fini(); |
8684094c | 1542 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1543 | nf_conntrack_ecache_fini(); |
73f4001a | 1544 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1545 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1546 | nf_conntrack_expect_fini(); |
08f6547d | 1547 | } |
9fb9cbb1 | 1548 | |
f94161c1 G |
1549 | /* |
1550 | * Mishearing the voices in his head, our hero wonders how he's | |
1551 | * supposed to kill the mall. | |
1552 | */ | |
1553 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1554 | { |
dece40e8 VD |
1555 | LIST_HEAD(single); |
1556 | ||
1557 | list_add(&net->exit_list, &single); | |
1558 | nf_conntrack_cleanup_net_list(&single); | |
1559 | } | |
1560 | ||
1561 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1562 | { | |
1563 | int busy; | |
1564 | struct net *net; | |
1565 | ||
f94161c1 G |
1566 | /* |
1567 | * This makes sure all current packets have passed through | |
1568 | * netfilter framework. Roll on, two-stage module | |
1569 | * delete... | |
1570 | */ | |
1571 | synchronize_net(); | |
dece40e8 VD |
1572 | i_see_dead_people: |
1573 | busy = 0; | |
1574 | list_for_each_entry(net, net_exit_list, exit_list) { | |
c655bc68 | 1575 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
dece40e8 VD |
1576 | if (atomic_read(&net->ct.count) != 0) |
1577 | busy = 1; | |
1578 | } | |
1579 | if (busy) { | |
9fb9cbb1 YK |
1580 | schedule(); |
1581 | goto i_see_dead_people; | |
1582 | } | |
1583 | ||
dece40e8 | 1584 | list_for_each_entry(net, net_exit_list, exit_list) { |
dece40e8 VD |
1585 | nf_conntrack_proto_pernet_fini(net); |
1586 | nf_conntrack_helper_pernet_fini(net); | |
1587 | nf_conntrack_ecache_pernet_fini(net); | |
1588 | nf_conntrack_tstamp_pernet_fini(net); | |
1589 | nf_conntrack_acct_pernet_fini(net); | |
1590 | nf_conntrack_expect_pernet_fini(net); | |
dece40e8 | 1591 | free_percpu(net->ct.stat); |
b7779d06 | 1592 | free_percpu(net->ct.pcpu_lists); |
dece40e8 | 1593 | } |
08f6547d AD |
1594 | } |
1595 | ||
d862a662 | 1596 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1597 | { |
ea781f19 ED |
1598 | struct hlist_nulls_head *hash; |
1599 | unsigned int nr_slots, i; | |
1600 | size_t sz; | |
9fb9cbb1 | 1601 | |
ea781f19 ED |
1602 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1603 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1604 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1605 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1606 | get_order(sz)); | |
f0ad4621 | 1607 | if (!hash) |
966567b7 | 1608 | hash = vzalloc(sz); |
9fb9cbb1 | 1609 | |
ea781f19 ED |
1610 | if (hash && nulls) |
1611 | for (i = 0; i < nr_slots; i++) | |
1612 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1613 | |
1614 | return hash; | |
1615 | } | |
ac565e5f | 1616 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1617 | |
fae718dd | 1618 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1619 | { |
4b5511eb | 1620 | int i, bucket, rc; |
96eb24d7 | 1621 | unsigned int hashsize, old_size; |
ea781f19 | 1622 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1623 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1624 | struct nf_conn *ct; |
9fb9cbb1 | 1625 | |
d696c7bd PM |
1626 | if (current->nsproxy->net_ns != &init_net) |
1627 | return -EOPNOTSUPP; | |
1628 | ||
9fb9cbb1 YK |
1629 | /* On boot, we can set this without any fancy locking. */ |
1630 | if (!nf_conntrack_htable_size) | |
1631 | return param_set_uint(val, kp); | |
1632 | ||
4b5511eb AP |
1633 | rc = kstrtouint(val, 0, &hashsize); |
1634 | if (rc) | |
1635 | return rc; | |
9fb9cbb1 YK |
1636 | if (!hashsize) |
1637 | return -EINVAL; | |
1638 | ||
d862a662 | 1639 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1640 | if (!hash) |
1641 | return -ENOMEM; | |
1642 | ||
93bb0ceb JDB |
1643 | local_bh_disable(); |
1644 | nf_conntrack_all_lock(); | |
a3efd812 | 1645 | write_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb | 1646 | |
76507f69 PM |
1647 | /* Lookups in the old hash might happen in parallel, which means we |
1648 | * might get false negatives during connection lookup. New connections | |
1649 | * created because of a false negative won't make it into the hash | |
93bb0ceb | 1650 | * though since that required taking the locks. |
76507f69 | 1651 | */ |
93bb0ceb | 1652 | |
56d52d48 FW |
1653 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
1654 | while (!hlist_nulls_empty(&nf_conntrack_hash[i])) { | |
1655 | h = hlist_nulls_entry(nf_conntrack_hash[i].first, | |
1656 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1657 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1658 | hlist_nulls_del_rcu(&h->hnnode); |
1b8c8a9f FW |
1659 | bucket = __hash_conntrack(nf_ct_net(ct), |
1660 | &h->tuple, hashsize); | |
ea781f19 | 1661 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1662 | } |
1663 | } | |
56d52d48 FW |
1664 | old_size = nf_conntrack_htable_size; |
1665 | old_hash = nf_conntrack_hash; | |
9fb9cbb1 | 1666 | |
56d52d48 FW |
1667 | nf_conntrack_hash = hash; |
1668 | nf_conntrack_htable_size = hashsize; | |
93bb0ceb | 1669 | |
a3efd812 | 1670 | write_seqcount_end(&nf_conntrack_generation); |
93bb0ceb JDB |
1671 | nf_conntrack_all_unlock(); |
1672 | local_bh_enable(); | |
9fb9cbb1 | 1673 | |
5e3c61f9 | 1674 | synchronize_net(); |
d862a662 | 1675 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1676 | return 0; |
1677 | } | |
fae718dd | 1678 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1679 | |
fae718dd | 1680 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1681 | &nf_conntrack_htable_size, 0600); |
1682 | ||
5bfddbd4 ED |
1683 | void nf_ct_untracked_status_or(unsigned long bits) |
1684 | { | |
b3c5163f ED |
1685 | int cpu; |
1686 | ||
1687 | for_each_possible_cpu(cpu) | |
1688 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1689 | } |
1690 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1691 | ||
f94161c1 | 1692 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1693 | { |
f205c5e0 | 1694 | int max_factor = 8; |
0c5366b3 FW |
1695 | int ret = -ENOMEM; |
1696 | int i, cpu; | |
93bb0ceb | 1697 | |
a3efd812 FW |
1698 | seqcount_init(&nf_conntrack_generation); |
1699 | ||
d5d20912 | 1700 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
93bb0ceb | 1701 | spin_lock_init(&nf_conntrack_locks[i]); |
9fb9cbb1 | 1702 | |
9fb9cbb1 | 1703 | if (!nf_conntrack_htable_size) { |
88eab472 ML |
1704 | /* Idea from tcp.c: use 1/16384 of memory. |
1705 | * On i386: 32MB machine has 512 buckets. | |
1706 | * >= 1GB machines have 16384 buckets. | |
1707 | * >= 4GB machines have 65536 buckets. | |
1708 | */ | |
9fb9cbb1 | 1709 | nf_conntrack_htable_size |
4481374c | 1710 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1711 | / sizeof(struct hlist_head)); |
88eab472 ML |
1712 | if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
1713 | nf_conntrack_htable_size = 65536; | |
1714 | else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) | |
f205c5e0 PM |
1715 | nf_conntrack_htable_size = 16384; |
1716 | if (nf_conntrack_htable_size < 32) | |
1717 | nf_conntrack_htable_size = 32; | |
1718 | ||
1719 | /* Use a max. factor of four by default to get the same max as | |
1720 | * with the old struct list_heads. When a table size is given | |
1721 | * we use the old value of 8 to avoid reducing the max. | |
1722 | * entries. */ | |
1723 | max_factor = 4; | |
9fb9cbb1 | 1724 | } |
56d52d48 FW |
1725 | |
1726 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1); | |
1727 | if (!nf_conntrack_hash) | |
1728 | return -ENOMEM; | |
1729 | ||
f205c5e0 | 1730 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1731 | |
0c5366b3 FW |
1732 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
1733 | sizeof(struct nf_conn), 0, | |
1734 | SLAB_DESTROY_BY_RCU, NULL); | |
1735 | if (!nf_conntrack_cachep) | |
1736 | goto err_cachep; | |
1737 | ||
654d0fbd | 1738 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1739 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1740 | nf_conntrack_max); | |
83b4dbe1 G |
1741 | |
1742 | ret = nf_conntrack_expect_init(); | |
1743 | if (ret < 0) | |
1744 | goto err_expect; | |
1745 | ||
b7ff3a1f G |
1746 | ret = nf_conntrack_acct_init(); |
1747 | if (ret < 0) | |
1748 | goto err_acct; | |
1749 | ||
73f4001a G |
1750 | ret = nf_conntrack_tstamp_init(); |
1751 | if (ret < 0) | |
1752 | goto err_tstamp; | |
1753 | ||
3fe0f943 G |
1754 | ret = nf_conntrack_ecache_init(); |
1755 | if (ret < 0) | |
1756 | goto err_ecache; | |
1757 | ||
8684094c G |
1758 | ret = nf_conntrack_timeout_init(); |
1759 | if (ret < 0) | |
1760 | goto err_timeout; | |
1761 | ||
5e615b22 G |
1762 | ret = nf_conntrack_helper_init(); |
1763 | if (ret < 0) | |
1764 | goto err_helper; | |
1765 | ||
5f69b8f5 G |
1766 | ret = nf_conntrack_labels_init(); |
1767 | if (ret < 0) | |
1768 | goto err_labels; | |
1769 | ||
41d73ec0 PM |
1770 | ret = nf_conntrack_seqadj_init(); |
1771 | if (ret < 0) | |
1772 | goto err_seqadj; | |
1773 | ||
5d0aa2cc PM |
1774 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1775 | ret = nf_ct_extend_register(&nf_ct_zone_extend); | |
1776 | if (ret < 0) | |
1777 | goto err_extend; | |
1778 | #endif | |
04d87001 G |
1779 | ret = nf_conntrack_proto_init(); |
1780 | if (ret < 0) | |
1781 | goto err_proto; | |
1782 | ||
9edd7ca0 | 1783 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1784 | for_each_possible_cpu(cpu) { |
1785 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1786 | write_pnet(&ct->ct_net, &init_net); |
1787 | atomic_set(&ct->ct_general.use, 1); | |
1788 | } | |
9edd7ca0 | 1789 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1790 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d AD |
1791 | return 0; |
1792 | ||
04d87001 | 1793 | err_proto: |
5d0aa2cc | 1794 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
04d87001 | 1795 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
5d0aa2cc | 1796 | err_extend: |
a9006892 | 1797 | #endif |
41d73ec0 PM |
1798 | nf_conntrack_seqadj_fini(); |
1799 | err_seqadj: | |
04d87001 | 1800 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1801 | err_labels: |
1802 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1803 | err_helper: |
1804 | nf_conntrack_timeout_fini(); | |
8684094c G |
1805 | err_timeout: |
1806 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1807 | err_ecache: |
1808 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1809 | err_tstamp: |
1810 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1811 | err_acct: |
1812 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1813 | err_expect: |
0c5366b3 FW |
1814 | kmem_cache_destroy(nf_conntrack_cachep); |
1815 | err_cachep: | |
56d52d48 | 1816 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
08f6547d AD |
1817 | return ret; |
1818 | } | |
1819 | ||
f94161c1 G |
1820 | void nf_conntrack_init_end(void) |
1821 | { | |
1822 | /* For use by REJECT target */ | |
1823 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1824 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
f94161c1 G |
1825 | } |
1826 | ||
8cc20198 ED |
1827 | /* |
1828 | * We need to use special "null" values, not used in hash table | |
1829 | */ | |
1830 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1831 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1832 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1833 | |
f94161c1 | 1834 | int nf_conntrack_init_net(struct net *net) |
08f6547d | 1835 | { |
b7779d06 JDB |
1836 | int ret = -ENOMEM; |
1837 | int cpu; | |
ceceae1b | 1838 | |
08f6547d | 1839 | atomic_set(&net->ct.count, 0); |
b7779d06 JDB |
1840 | |
1841 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); | |
1842 | if (!net->ct.pcpu_lists) | |
08f6547d | 1843 | goto err_stat; |
b7779d06 JDB |
1844 | |
1845 | for_each_possible_cpu(cpu) { | |
1846 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1847 | ||
1848 | spin_lock_init(&pcpu->lock); | |
1849 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); | |
1850 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); | |
08f6547d | 1851 | } |
5b3501fa | 1852 | |
b7779d06 JDB |
1853 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1854 | if (!net->ct.stat) | |
1855 | goto err_pcpu_lists; | |
1856 | ||
83b4dbe1 | 1857 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1858 | if (ret < 0) |
1859 | goto err_expect; | |
b7ff3a1f | 1860 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 1861 | if (ret < 0) |
08f6547d | 1862 | goto err_acct; |
73f4001a | 1863 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
1864 | if (ret < 0) |
1865 | goto err_tstamp; | |
3fe0f943 | 1866 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
1867 | if (ret < 0) |
1868 | goto err_ecache; | |
5e615b22 | 1869 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
1870 | if (ret < 0) |
1871 | goto err_helper; | |
04d87001 | 1872 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
1873 | if (ret < 0) |
1874 | goto err_proto; | |
08f6547d | 1875 | return 0; |
c539f017 | 1876 | |
f94161c1 | 1877 | err_proto: |
5e615b22 | 1878 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 1879 | err_helper: |
3fe0f943 | 1880 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 1881 | err_ecache: |
73f4001a | 1882 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 1883 | err_tstamp: |
b7ff3a1f | 1884 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 1885 | err_acct: |
83b4dbe1 | 1886 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 1887 | err_expect: |
0d55af87 | 1888 | free_percpu(net->ct.stat); |
b7779d06 JDB |
1889 | err_pcpu_lists: |
1890 | free_percpu(net->ct.pcpu_lists); | |
0d55af87 | 1891 | err_stat: |
08f6547d AD |
1892 | return ret; |
1893 | } |