Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* Connection state tracking for netfilter. This is separated from, |
2 | but required by, the NAT layer; it can also be used by an iptables | |
3 | extension. */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
dc808fe2 | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
9fb9cbb1 | 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 | ||
b87a2f91 FW |
75 | struct conntrack_gc_work { |
76 | struct delayed_work dwork; | |
77 | u32 last_bucket; | |
78 | bool exiting; | |
79 | }; | |
80 | ||
0c5366b3 | 81 | static __read_mostly struct kmem_cache *nf_conntrack_cachep; |
b16c2919 | 82 | static __read_mostly spinlock_t nf_conntrack_locks_all_lock; |
70d72b7e | 83 | static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock); |
b16c2919 SL |
84 | static __read_mostly bool nf_conntrack_locks_all; |
85 | ||
b87a2f91 FW |
86 | #define GC_MAX_BUCKETS_DIV 64u |
87 | #define GC_MAX_BUCKETS 8192u | |
88 | #define GC_INTERVAL (5 * HZ) | |
89 | #define GC_MAX_EVICTS 256u | |
90 | ||
91 | static struct conntrack_gc_work conntrack_gc_work; | |
92 | ||
b16c2919 SL |
93 | void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) |
94 | { | |
95 | spin_lock(lock); | |
96 | while (unlikely(nf_conntrack_locks_all)) { | |
97 | spin_unlock(lock); | |
b316ff78 PZ |
98 | |
99 | /* | |
100 | * Order the 'nf_conntrack_locks_all' load vs. the | |
101 | * spin_unlock_wait() loads below, to ensure | |
102 | * that 'nf_conntrack_locks_all_lock' is indeed held: | |
103 | */ | |
104 | smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ | |
e39365be | 105 | spin_unlock_wait(&nf_conntrack_locks_all_lock); |
b16c2919 SL |
106 | spin_lock(lock); |
107 | } | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); | |
110 | ||
93bb0ceb JDB |
111 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
112 | { | |
113 | h1 %= CONNTRACK_LOCKS; | |
114 | h2 %= CONNTRACK_LOCKS; | |
115 | spin_unlock(&nf_conntrack_locks[h1]); | |
116 | if (h1 != h2) | |
117 | spin_unlock(&nf_conntrack_locks[h2]); | |
118 | } | |
119 | ||
120 | /* return true if we need to recompute hashes (in case hash table was resized) */ | |
121 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, | |
122 | unsigned int h2, unsigned int sequence) | |
123 | { | |
124 | h1 %= CONNTRACK_LOCKS; | |
125 | h2 %= CONNTRACK_LOCKS; | |
126 | if (h1 <= h2) { | |
b16c2919 | 127 | nf_conntrack_lock(&nf_conntrack_locks[h1]); |
93bb0ceb JDB |
128 | if (h1 != h2) |
129 | spin_lock_nested(&nf_conntrack_locks[h2], | |
130 | SINGLE_DEPTH_NESTING); | |
131 | } else { | |
b16c2919 | 132 | nf_conntrack_lock(&nf_conntrack_locks[h2]); |
93bb0ceb JDB |
133 | spin_lock_nested(&nf_conntrack_locks[h1], |
134 | SINGLE_DEPTH_NESTING); | |
135 | } | |
a3efd812 | 136 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
93bb0ceb JDB |
137 | nf_conntrack_double_unlock(h1, h2); |
138 | return true; | |
139 | } | |
140 | return false; | |
141 | } | |
142 | ||
143 | static void nf_conntrack_all_lock(void) | |
144 | { | |
145 | int i; | |
146 | ||
b16c2919 SL |
147 | spin_lock(&nf_conntrack_locks_all_lock); |
148 | nf_conntrack_locks_all = true; | |
149 | ||
b316ff78 PZ |
150 | /* |
151 | * Order the above store of 'nf_conntrack_locks_all' against | |
152 | * the spin_unlock_wait() loads below, such that if | |
153 | * nf_conntrack_lock() observes 'nf_conntrack_locks_all' | |
154 | * we must observe nf_conntrack_locks[] held: | |
155 | */ | |
156 | smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ | |
157 | ||
b16c2919 | 158 | for (i = 0; i < CONNTRACK_LOCKS; i++) { |
e39365be | 159 | spin_unlock_wait(&nf_conntrack_locks[i]); |
b16c2919 | 160 | } |
93bb0ceb JDB |
161 | } |
162 | ||
163 | static void nf_conntrack_all_unlock(void) | |
164 | { | |
b316ff78 PZ |
165 | /* |
166 | * All prior stores must be complete before we clear | |
167 | * 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock() | |
168 | * might observe the false value but not the entire | |
169 | * critical section: | |
170 | */ | |
171 | smp_store_release(&nf_conntrack_locks_all, false); | |
b16c2919 | 172 | spin_unlock(&nf_conntrack_locks_all_lock); |
93bb0ceb JDB |
173 | } |
174 | ||
e2b7606c | 175 | unsigned int nf_conntrack_htable_size __read_mostly; |
2567c4ea PNA |
176 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
177 | ||
e478075c | 178 | unsigned int nf_conntrack_max __read_mostly; |
92e47ba8 | 179 | seqcount_t nf_conntrack_generation __read_mostly; |
13b18339 | 180 | |
b3c5163f ED |
181 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
182 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 183 | |
141658fb | 184 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
9fb9cbb1 | 185 | |
1b8c8a9f FW |
186 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, |
187 | const struct net *net) | |
9fb9cbb1 | 188 | { |
0794935e | 189 | unsigned int n; |
1b8c8a9f | 190 | u32 seed; |
0794935e | 191 | |
141658fb FW |
192 | get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd)); |
193 | ||
0794935e PM |
194 | /* The direction must be ignored, so we hash everything up to the |
195 | * destination ports (which is a multiple of 4) and treat the last | |
196 | * three bytes manually. | |
197 | */ | |
1b8c8a9f | 198 | seed = nf_conntrack_hash_rnd ^ net_hash_mix(net); |
0794935e | 199 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
1b8c8a9f | 200 | return jhash2((u32 *)tuple, n, seed ^ |
99f07e91 CG |
201 | (((__force __u16)tuple->dst.u.all << 16) | |
202 | tuple->dst.protonum)); | |
203 | } | |
204 | ||
56d52d48 | 205 | static u32 scale_hash(u32 hash) |
99f07e91 | 206 | { |
56d52d48 | 207 | return reciprocal_scale(hash, nf_conntrack_htable_size); |
99f07e91 | 208 | } |
0794935e | 209 | |
1b8c8a9f FW |
210 | static u32 __hash_conntrack(const struct net *net, |
211 | const struct nf_conntrack_tuple *tuple, | |
212 | unsigned int size) | |
99f07e91 | 213 | { |
1b8c8a9f | 214 | return reciprocal_scale(hash_conntrack_raw(tuple, net), size); |
9fb9cbb1 YK |
215 | } |
216 | ||
1b8c8a9f FW |
217 | static u32 hash_conntrack(const struct net *net, |
218 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 219 | { |
56d52d48 | 220 | return scale_hash(hash_conntrack_raw(tuple, net)); |
9fb9cbb1 YK |
221 | } |
222 | ||
5f2b4c90 | 223 | bool |
9fb9cbb1 YK |
224 | nf_ct_get_tuple(const struct sk_buff *skb, |
225 | unsigned int nhoff, | |
226 | unsigned int dataoff, | |
227 | u_int16_t l3num, | |
228 | u_int8_t protonum, | |
a31f1adc | 229 | struct net *net, |
9fb9cbb1 YK |
230 | struct nf_conntrack_tuple *tuple, |
231 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 232 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 233 | { |
443a70d5 | 234 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
235 | |
236 | tuple->src.l3num = l3num; | |
237 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 238 | return false; |
9fb9cbb1 YK |
239 | |
240 | tuple->dst.protonum = protonum; | |
241 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
242 | ||
a31f1adc | 243 | return l4proto->pkt_to_tuple(skb, dataoff, net, tuple); |
9fb9cbb1 | 244 | } |
13b18339 | 245 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 246 | |
5f2b4c90 | 247 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
a31f1adc EB |
248 | u_int16_t l3num, |
249 | struct net *net, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
250 | { |
251 | struct nf_conntrack_l3proto *l3proto; | |
252 | struct nf_conntrack_l4proto *l4proto; | |
253 | unsigned int protoff; | |
254 | u_int8_t protonum; | |
255 | int ret; | |
256 | ||
257 | rcu_read_lock(); | |
258 | ||
259 | l3proto = __nf_ct_l3proto_find(l3num); | |
260 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
261 | if (ret != NF_ACCEPT) { | |
262 | rcu_read_unlock(); | |
5f2b4c90 | 263 | return false; |
e2a3123f YK |
264 | } |
265 | ||
266 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
267 | ||
a31f1adc | 268 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple, |
e2a3123f YK |
269 | l3proto, l4proto); |
270 | ||
271 | rcu_read_unlock(); | |
272 | return ret; | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
275 | ||
5f2b4c90 | 276 | bool |
9fb9cbb1 YK |
277 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
278 | const struct nf_conntrack_tuple *orig, | |
279 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 280 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 281 | { |
443a70d5 | 282 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
283 | |
284 | inverse->src.l3num = orig->src.l3num; | |
285 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 286 | return false; |
9fb9cbb1 YK |
287 | |
288 | inverse->dst.dir = !orig->dst.dir; | |
289 | ||
290 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 291 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 292 | } |
13b18339 | 293 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 294 | |
9fb9cbb1 YK |
295 | static void |
296 | clean_from_lists(struct nf_conn *ct) | |
297 | { | |
0d53778e | 298 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
299 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
300 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
301 | |
302 | /* Destroy all pending expectations */ | |
c1d10adb | 303 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
304 | } |
305 | ||
b7779d06 JDB |
306 | /* must be called with local_bh_disable */ |
307 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) | |
308 | { | |
309 | struct ct_pcpu *pcpu; | |
310 | ||
311 | /* add this conntrack to the (per cpu) dying list */ | |
312 | ct->cpu = smp_processor_id(); | |
313 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
314 | ||
315 | spin_lock(&pcpu->lock); | |
316 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
317 | &pcpu->dying); | |
318 | spin_unlock(&pcpu->lock); | |
319 | } | |
320 | ||
321 | /* must be called with local_bh_disable */ | |
322 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) | |
323 | { | |
324 | struct ct_pcpu *pcpu; | |
325 | ||
326 | /* add this conntrack to the (per cpu) unconfirmed list */ | |
327 | ct->cpu = smp_processor_id(); | |
328 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
329 | ||
330 | spin_lock(&pcpu->lock); | |
331 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
332 | &pcpu->unconfirmed); | |
333 | spin_unlock(&pcpu->lock); | |
334 | } | |
335 | ||
336 | /* must be called with local_bh_disable */ | |
337 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) | |
338 | { | |
339 | struct ct_pcpu *pcpu; | |
340 | ||
341 | /* We overload first tuple to link into unconfirmed or dying list.*/ | |
342 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
343 | ||
344 | spin_lock(&pcpu->lock); | |
345 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
346 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
347 | spin_unlock(&pcpu->lock); | |
348 | } | |
349 | ||
0838aa7f | 350 | /* Released via destroy_conntrack() */ |
308ac914 DB |
351 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
352 | const struct nf_conntrack_zone *zone, | |
353 | gfp_t flags) | |
0838aa7f PNA |
354 | { |
355 | struct nf_conn *tmpl; | |
356 | ||
f58e5aa7 | 357 | tmpl = kzalloc(sizeof(*tmpl), flags); |
0838aa7f PNA |
358 | if (tmpl == NULL) |
359 | return NULL; | |
360 | ||
361 | tmpl->status = IPS_TEMPLATE; | |
362 | write_pnet(&tmpl->ct_net, net); | |
6c8dee98 | 363 | nf_ct_zone_add(tmpl, zone); |
0838aa7f PNA |
364 | atomic_set(&tmpl->ct_general.use, 0); |
365 | ||
366 | return tmpl; | |
0838aa7f PNA |
367 | } |
368 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); | |
369 | ||
9cf94eab | 370 | void nf_ct_tmpl_free(struct nf_conn *tmpl) |
0838aa7f PNA |
371 | { |
372 | nf_ct_ext_destroy(tmpl); | |
373 | nf_ct_ext_free(tmpl); | |
374 | kfree(tmpl); | |
375 | } | |
9cf94eab | 376 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_free); |
0838aa7f | 377 | |
9fb9cbb1 YK |
378 | static void |
379 | destroy_conntrack(struct nf_conntrack *nfct) | |
380 | { | |
381 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
605dcad6 | 382 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 383 | |
0d53778e | 384 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 | 385 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
9fb9cbb1 | 386 | |
0838aa7f PNA |
387 | if (unlikely(nf_ct_is_template(ct))) { |
388 | nf_ct_tmpl_free(ct); | |
389 | return; | |
390 | } | |
923f4902 | 391 | rcu_read_lock(); |
5e8fbe2a | 392 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
4b4ceb9d | 393 | if (l4proto->destroy) |
605dcad6 | 394 | l4proto->destroy(ct); |
9fb9cbb1 | 395 | |
982d9a9c | 396 | rcu_read_unlock(); |
9fb9cbb1 | 397 | |
ca7433df | 398 | local_bh_disable(); |
9fb9cbb1 YK |
399 | /* Expectations will have been removed in clean_from_lists, |
400 | * except TFTP can create an expectation on the first packet, | |
401 | * before connection is in the list, so we need to clean here, | |
ca7433df JDB |
402 | * too. |
403 | */ | |
c1d10adb | 404 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 405 | |
b7779d06 | 406 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
9fb9cbb1 | 407 | |
ca7433df | 408 | local_bh_enable(); |
9fb9cbb1 YK |
409 | |
410 | if (ct->master) | |
411 | nf_ct_put(ct->master); | |
412 | ||
0d53778e | 413 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
414 | nf_conntrack_free(ct); |
415 | } | |
416 | ||
02982c27 | 417 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 418 | { |
0d55af87 | 419 | struct net *net = nf_ct_net(ct); |
93bb0ceb | 420 | unsigned int hash, reply_hash; |
93bb0ceb | 421 | unsigned int sequence; |
9fb9cbb1 | 422 | |
9858a3ae | 423 | nf_ct_helper_destroy(ct); |
93bb0ceb JDB |
424 | |
425 | local_bh_disable(); | |
426 | do { | |
a3efd812 | 427 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 428 | hash = hash_conntrack(net, |
93bb0ceb | 429 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 430 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
431 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
432 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
433 | ||
9fb9cbb1 | 434 | clean_from_lists(ct); |
93bb0ceb JDB |
435 | nf_conntrack_double_unlock(hash, reply_hash); |
436 | ||
b7779d06 | 437 | nf_ct_add_to_dying_list(ct); |
93bb0ceb | 438 | |
93bb0ceb | 439 | local_bh_enable(); |
dd7669a9 | 440 | } |
dd7669a9 | 441 | |
02982c27 | 442 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 443 | { |
a992ca2a PNA |
444 | struct nf_conn_tstamp *tstamp; |
445 | ||
f330a7fd FW |
446 | if (test_and_set_bit(IPS_DYING_BIT, &ct->status)) |
447 | return false; | |
448 | ||
a992ca2a PNA |
449 | tstamp = nf_conn_tstamp_find(ct); |
450 | if (tstamp && tstamp->stop == 0) | |
d2de875c | 451 | tstamp->stop = ktime_get_real_ns(); |
dd7669a9 | 452 | |
9500507c FW |
453 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
454 | portid, report) < 0) { | |
f330a7fd FW |
455 | /* destroy event was not delivered. nf_ct_put will |
456 | * be done by event cache worker on redelivery. | |
457 | */ | |
dd7669a9 | 458 | nf_ct_delete_from_lists(ct); |
9500507c | 459 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
02982c27 | 460 | return false; |
dd7669a9 | 461 | } |
9500507c FW |
462 | |
463 | nf_conntrack_ecache_work(nf_ct_net(ct)); | |
dd7669a9 | 464 | nf_ct_delete_from_lists(ct); |
9fb9cbb1 | 465 | nf_ct_put(ct); |
02982c27 FW |
466 | return true; |
467 | } | |
468 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
469 | ||
c6825c09 AV |
470 | static inline bool |
471 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, | |
308ac914 | 472 | const struct nf_conntrack_tuple *tuple, |
e0c7d472 FW |
473 | const struct nf_conntrack_zone *zone, |
474 | const struct net *net) | |
c6825c09 AV |
475 | { |
476 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
477 | ||
478 | /* A conntrack can be recreated with the equal tuple, | |
479 | * so we need to check that the conntrack is confirmed | |
480 | */ | |
481 | return nf_ct_tuple_equal(tuple, &h->tuple) && | |
deedb590 | 482 | nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) && |
e0c7d472 FW |
483 | nf_ct_is_confirmed(ct) && |
484 | net_eq(net, nf_ct_net(ct)); | |
c6825c09 AV |
485 | } |
486 | ||
f330a7fd FW |
487 | /* caller must hold rcu readlock and none of the nf_conntrack_locks */ |
488 | static void nf_ct_gc_expired(struct nf_conn *ct) | |
489 | { | |
490 | if (!atomic_inc_not_zero(&ct->ct_general.use)) | |
491 | return; | |
492 | ||
493 | if (nf_ct_should_gc(ct)) | |
494 | nf_ct_kill(ct); | |
495 | ||
496 | nf_ct_put(ct); | |
497 | } | |
498 | ||
ea781f19 ED |
499 | /* |
500 | * Warning : | |
501 | * - Caller must take a reference on returned object | |
502 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
ea781f19 | 503 | */ |
99f07e91 | 504 | static struct nf_conntrack_tuple_hash * |
308ac914 | 505 | ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 506 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
507 | { |
508 | struct nf_conntrack_tuple_hash *h; | |
5e3c61f9 | 509 | struct hlist_nulls_head *ct_hash; |
ea781f19 | 510 | struct hlist_nulls_node *n; |
92e47ba8 | 511 | unsigned int bucket, hsize; |
9fb9cbb1 | 512 | |
ea781f19 | 513 | begin: |
92e47ba8 LZ |
514 | nf_conntrack_get_ht(&ct_hash, &hsize); |
515 | bucket = reciprocal_scale(hash, hsize); | |
5e3c61f9 FW |
516 | |
517 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) { | |
f330a7fd FW |
518 | struct nf_conn *ct; |
519 | ||
520 | ct = nf_ct_tuplehash_to_ctrack(h); | |
521 | if (nf_ct_is_expired(ct)) { | |
522 | nf_ct_gc_expired(ct); | |
523 | continue; | |
524 | } | |
525 | ||
526 | if (nf_ct_is_dying(ct)) | |
527 | continue; | |
528 | ||
8e8118f8 | 529 | if (nf_ct_key_equal(h, tuple, zone, net)) |
9fb9cbb1 | 530 | return h; |
9fb9cbb1 | 531 | } |
ea781f19 ED |
532 | /* |
533 | * if the nulls value we got at the end of this lookup is | |
534 | * not the expected one, we must restart lookup. | |
535 | * We probably met an item that was moved to another chain. | |
536 | */ | |
99f07e91 | 537 | if (get_nulls_value(n) != bucket) { |
2cf12348 | 538 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
ea781f19 | 539 | goto begin; |
af740b2c | 540 | } |
9fb9cbb1 YK |
541 | |
542 | return NULL; | |
543 | } | |
99f07e91 | 544 | |
9fb9cbb1 | 545 | /* Find a connection corresponding to a tuple. */ |
99f07e91 | 546 | static struct nf_conntrack_tuple_hash * |
308ac914 | 547 | __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 548 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
549 | { |
550 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 551 | struct nf_conn *ct; |
9fb9cbb1 | 552 | |
76507f69 | 553 | rcu_read_lock(); |
ea781f19 | 554 | begin: |
99f07e91 | 555 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
556 | if (h) { |
557 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
558 | if (unlikely(nf_ct_is_dying(ct) || |
559 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 560 | h = NULL; |
ea781f19 | 561 | else { |
e0c7d472 | 562 | if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) { |
ea781f19 ED |
563 | nf_ct_put(ct); |
564 | goto begin; | |
565 | } | |
566 | } | |
76507f69 PM |
567 | } |
568 | rcu_read_unlock(); | |
9fb9cbb1 YK |
569 | |
570 | return h; | |
571 | } | |
99f07e91 CG |
572 | |
573 | struct nf_conntrack_tuple_hash * | |
308ac914 | 574 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 CG |
575 | const struct nf_conntrack_tuple *tuple) |
576 | { | |
577 | return __nf_conntrack_find_get(net, zone, tuple, | |
1b8c8a9f | 578 | hash_conntrack_raw(tuple, net)); |
99f07e91 | 579 | } |
13b18339 | 580 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 581 | |
c1d10adb PNA |
582 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
583 | unsigned int hash, | |
b476b72a | 584 | unsigned int reply_hash) |
c1d10adb | 585 | { |
ea781f19 | 586 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
56d52d48 | 587 | &nf_conntrack_hash[hash]); |
ea781f19 | 588 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
56d52d48 | 589 | &nf_conntrack_hash[reply_hash]); |
c1d10adb PNA |
590 | } |
591 | ||
7d367e06 JK |
592 | int |
593 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 594 | { |
308ac914 | 595 | const struct nf_conntrack_zone *zone; |
d696c7bd | 596 | struct net *net = nf_ct_net(ct); |
b476b72a | 597 | unsigned int hash, reply_hash; |
7d367e06 JK |
598 | struct nf_conntrack_tuple_hash *h; |
599 | struct hlist_nulls_node *n; | |
93bb0ceb | 600 | unsigned int sequence; |
c1d10adb | 601 | |
5d0aa2cc | 602 | zone = nf_ct_zone(ct); |
7d367e06 | 603 | |
93bb0ceb JDB |
604 | local_bh_disable(); |
605 | do { | |
a3efd812 | 606 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 607 | hash = hash_conntrack(net, |
93bb0ceb | 608 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 609 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
610 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
611 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
7d367e06 JK |
612 | |
613 | /* See if there's one in the list already, including reverse */ | |
56d52d48 | 614 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 615 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 616 | zone, net)) |
7d367e06 | 617 | goto out; |
86804348 | 618 | |
56d52d48 | 619 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 620 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 621 | zone, net)) |
7d367e06 | 622 | goto out; |
c1d10adb | 623 | |
e53376be PNA |
624 | smp_wmb(); |
625 | /* The caller holds a reference to this object */ | |
626 | atomic_set(&ct->ct_general.use, 2); | |
b476b72a | 627 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 628 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 629 | NF_CT_STAT_INC(net, insert); |
93bb0ceb | 630 | local_bh_enable(); |
7d367e06 JK |
631 | return 0; |
632 | ||
633 | out: | |
93bb0ceb | 634 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 635 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 636 | local_bh_enable(); |
7d367e06 | 637 | return -EEXIST; |
c1d10adb | 638 | } |
7d367e06 | 639 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 640 | |
ba76738c PNA |
641 | static inline void nf_ct_acct_update(struct nf_conn *ct, |
642 | enum ip_conntrack_info ctinfo, | |
643 | unsigned int len) | |
644 | { | |
645 | struct nf_conn_acct *acct; | |
646 | ||
647 | acct = nf_conn_acct_find(ct); | |
648 | if (acct) { | |
649 | struct nf_conn_counter *counter = acct->counter; | |
650 | ||
651 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); | |
652 | atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes); | |
653 | } | |
654 | } | |
655 | ||
71d8c47f PNA |
656 | static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
657 | const struct nf_conn *loser_ct) | |
658 | { | |
659 | struct nf_conn_acct *acct; | |
660 | ||
661 | acct = nf_conn_acct_find(loser_ct); | |
662 | if (acct) { | |
663 | struct nf_conn_counter *counter = acct->counter; | |
71d8c47f PNA |
664 | unsigned int bytes; |
665 | ||
666 | /* u32 should be fine since we must have seen one packet. */ | |
667 | bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes); | |
668 | nf_ct_acct_update(ct, ctinfo, bytes); | |
669 | } | |
670 | } | |
671 | ||
672 | /* Resolve race on insertion if this protocol allows this. */ | |
673 | static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb, | |
674 | enum ip_conntrack_info ctinfo, | |
675 | struct nf_conntrack_tuple_hash *h) | |
676 | { | |
677 | /* This is the conntrack entry already in hashes that won race. */ | |
678 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
679 | struct nf_conntrack_l4proto *l4proto; | |
680 | ||
681 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); | |
682 | if (l4proto->allow_clash && | |
590b52e1 | 683 | !nfct_nat(ct) && |
71d8c47f PNA |
684 | !nf_ct_is_dying(ct) && |
685 | atomic_inc_not_zero(&ct->ct_general.use)) { | |
686 | nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct); | |
687 | nf_conntrack_put(skb->nfct); | |
688 | /* Assign conntrack already in hashes to this skbuff. Don't | |
689 | * modify skb->nfctinfo to ensure consistent stateful filtering. | |
690 | */ | |
691 | skb->nfct = &ct->ct_general; | |
692 | return NF_ACCEPT; | |
693 | } | |
694 | NF_CT_STAT_INC(net, drop); | |
695 | return NF_DROP; | |
696 | } | |
697 | ||
9fb9cbb1 YK |
698 | /* Confirm a connection given skb; places it in hash table */ |
699 | int | |
3db05fea | 700 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 | 701 | { |
308ac914 | 702 | const struct nf_conntrack_zone *zone; |
b476b72a | 703 | unsigned int hash, reply_hash; |
df0933dc | 704 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 705 | struct nf_conn *ct; |
df0933dc | 706 | struct nf_conn_help *help; |
a992ca2a | 707 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 708 | struct hlist_nulls_node *n; |
9fb9cbb1 | 709 | enum ip_conntrack_info ctinfo; |
400dad39 | 710 | struct net *net; |
93bb0ceb | 711 | unsigned int sequence; |
71d8c47f | 712 | int ret = NF_DROP; |
9fb9cbb1 | 713 | |
3db05fea | 714 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 715 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
716 | |
717 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
718 | ICMP/TCP RST packets in other direction. Actual packet | |
719 | which created connection will be IP_CT_NEW or for an | |
720 | expected connection, IP_CT_RELATED. */ | |
721 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
722 | return NF_ACCEPT; | |
723 | ||
5d0aa2cc | 724 | zone = nf_ct_zone(ct); |
93bb0ceb JDB |
725 | local_bh_disable(); |
726 | ||
727 | do { | |
a3efd812 | 728 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb JDB |
729 | /* reuse the hash saved before */ |
730 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
56d52d48 | 731 | hash = scale_hash(hash); |
deedb590 | 732 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
733 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
734 | ||
735 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
9fb9cbb1 YK |
736 | |
737 | /* We're not in hash table, and we refuse to set up related | |
93bb0ceb JDB |
738 | * connections for unconfirmed conns. But packet copies and |
739 | * REJECT will give spurious warnings here. | |
740 | */ | |
9fb9cbb1 YK |
741 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
742 | ||
25985edc | 743 | /* No external references means no one else could have |
93bb0ceb JDB |
744 | * confirmed us. |
745 | */ | |
9fb9cbb1 | 746 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
0d53778e | 747 | pr_debug("Confirming conntrack %p\n", ct); |
8ca3f5e9 PNA |
748 | /* We have to check the DYING flag after unlink to prevent |
749 | * a race against nf_ct_get_next_corpse() possibly called from | |
750 | * user context, else we insert an already 'dead' hash, blocking | |
751 | * further use of that particular connection -JM. | |
752 | */ | |
753 | nf_ct_del_from_dying_or_unconfirmed_list(ct); | |
754 | ||
71d8c47f PNA |
755 | if (unlikely(nf_ct_is_dying(ct))) { |
756 | nf_ct_add_to_dying_list(ct); | |
757 | goto dying; | |
758 | } | |
fc350777 | 759 | |
9fb9cbb1 YK |
760 | /* See if there's one in the list already, including reverse: |
761 | NAT could have grabbed it without realizing, since we're | |
762 | not in the hash. If there is, we lost race. */ | |
56d52d48 | 763 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 764 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 765 | zone, net)) |
df0933dc | 766 | goto out; |
86804348 | 767 | |
56d52d48 | 768 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 769 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 770 | zone, net)) |
df0933dc | 771 | goto out; |
9fb9cbb1 | 772 | |
df0933dc PM |
773 | /* Timer relative to confirmation time, not original |
774 | setting time, otherwise we'd get timer wrap in | |
775 | weird delay cases. */ | |
f330a7fd | 776 | ct->timeout += nfct_time_stamp; |
df0933dc | 777 | atomic_inc(&ct->ct_general.use); |
45eec341 | 778 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 779 | |
a992ca2a PNA |
780 | /* set conntrack timestamp, if enabled. */ |
781 | tstamp = nf_conn_tstamp_find(ct); | |
782 | if (tstamp) { | |
783 | if (skb->tstamp.tv64 == 0) | |
e3192690 | 784 | __net_timestamp(skb); |
a992ca2a PNA |
785 | |
786 | tstamp->start = ktime_to_ns(skb->tstamp); | |
787 | } | |
5c8ec910 PM |
788 | /* Since the lookup is lockless, hash insertion must be done after |
789 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
790 | * guarantee that no other CPU can find the conntrack before the above | |
791 | * stores are visible. | |
792 | */ | |
b476b72a | 793 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 794 | nf_conntrack_double_unlock(hash, reply_hash); |
93bb0ceb | 795 | local_bh_enable(); |
5c8ec910 | 796 | |
df0933dc PM |
797 | help = nfct_help(ct); |
798 | if (help && help->helper) | |
a71996fc | 799 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 800 | |
df0933dc | 801 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 802 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 803 | return NF_ACCEPT; |
9fb9cbb1 | 804 | |
df0933dc | 805 | out: |
8ca3f5e9 | 806 | nf_ct_add_to_dying_list(ct); |
71d8c47f PNA |
807 | ret = nf_ct_resolve_clash(net, skb, ctinfo, h); |
808 | dying: | |
93bb0ceb | 809 | nf_conntrack_double_unlock(hash, reply_hash); |
0d55af87 | 810 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 811 | local_bh_enable(); |
71d8c47f | 812 | return ret; |
9fb9cbb1 | 813 | } |
13b18339 | 814 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
815 | |
816 | /* Returns true if a connection correspondings to the tuple (required | |
817 | for NAT). */ | |
818 | int | |
819 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
820 | const struct nf_conn *ignored_conntrack) | |
821 | { | |
400dad39 | 822 | struct net *net = nf_ct_net(ignored_conntrack); |
308ac914 | 823 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 | 824 | struct nf_conntrack_tuple_hash *h; |
5e3c61f9 | 825 | struct hlist_nulls_head *ct_hash; |
92e47ba8 | 826 | unsigned int hash, hsize; |
ea781f19 | 827 | struct hlist_nulls_node *n; |
5d0aa2cc | 828 | struct nf_conn *ct; |
308ac914 DB |
829 | |
830 | zone = nf_ct_zone(ignored_conntrack); | |
9fb9cbb1 | 831 | |
2cf12348 | 832 | rcu_read_lock(); |
95a8d19f | 833 | begin: |
92e47ba8 LZ |
834 | nf_conntrack_get_ht(&ct_hash, &hsize); |
835 | hash = __hash_conntrack(net, tuple, hsize); | |
5e3c61f9 FW |
836 | |
837 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) { | |
5d0aa2cc | 838 | ct = nf_ct_tuplehash_to_ctrack(h); |
f330a7fd FW |
839 | |
840 | if (ct == ignored_conntrack) | |
841 | continue; | |
842 | ||
843 | if (nf_ct_is_expired(ct)) { | |
844 | nf_ct_gc_expired(ct); | |
845 | continue; | |
846 | } | |
847 | ||
848 | if (nf_ct_key_equal(h, tuple, zone, net)) { | |
2cf12348 FW |
849 | NF_CT_STAT_INC_ATOMIC(net, found); |
850 | rcu_read_unlock(); | |
ba419aff PM |
851 | return 1; |
852 | } | |
ba419aff | 853 | } |
95a8d19f FW |
854 | |
855 | if (get_nulls_value(n) != hash) { | |
856 | NF_CT_STAT_INC_ATOMIC(net, search_restart); | |
857 | goto begin; | |
858 | } | |
859 | ||
2cf12348 | 860 | rcu_read_unlock(); |
9fb9cbb1 | 861 | |
ba419aff | 862 | return 0; |
9fb9cbb1 | 863 | } |
13b18339 | 864 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 865 | |
7ae7730f PM |
866 | #define NF_CT_EVICTION_RANGE 8 |
867 | ||
9fb9cbb1 YK |
868 | /* There's a small race here where we may free a just-assured |
869 | connection. Too bad: we're in trouble anyway. */ | |
242922a0 FW |
870 | static unsigned int early_drop_list(struct net *net, |
871 | struct hlist_nulls_head *head) | |
9fb9cbb1 | 872 | { |
9fb9cbb1 | 873 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 874 | struct hlist_nulls_node *n; |
242922a0 FW |
875 | unsigned int drops = 0; |
876 | struct nf_conn *tmp; | |
3e86638e | 877 | |
242922a0 FW |
878 | hlist_nulls_for_each_entry_rcu(h, n, head, hnnode) { |
879 | tmp = nf_ct_tuplehash_to_ctrack(h); | |
9fb9cbb1 | 880 | |
f330a7fd FW |
881 | if (nf_ct_is_expired(tmp)) { |
882 | nf_ct_gc_expired(tmp); | |
883 | continue; | |
884 | } | |
885 | ||
242922a0 FW |
886 | if (test_bit(IPS_ASSURED_BIT, &tmp->status) || |
887 | !net_eq(nf_ct_net(tmp), net) || | |
888 | nf_ct_is_dying(tmp)) | |
889 | continue; | |
76507f69 | 890 | |
242922a0 FW |
891 | if (!atomic_inc_not_zero(&tmp->ct_general.use)) |
892 | continue; | |
76507f69 | 893 | |
242922a0 FW |
894 | /* kill only if still in same netns -- might have moved due to |
895 | * SLAB_DESTROY_BY_RCU rules. | |
896 | * | |
897 | * We steal the timer reference. If that fails timer has | |
898 | * already fired or someone else deleted it. Just drop ref | |
899 | * and move to next entry. | |
900 | */ | |
901 | if (net_eq(nf_ct_net(tmp), net) && | |
902 | nf_ct_is_confirmed(tmp) && | |
242922a0 FW |
903 | nf_ct_delete(tmp, 0, 0)) |
904 | drops++; | |
905 | ||
906 | nf_ct_put(tmp); | |
9fb9cbb1 | 907 | } |
3e86638e | 908 | |
242922a0 FW |
909 | return drops; |
910 | } | |
9fb9cbb1 | 911 | |
242922a0 FW |
912 | static noinline int early_drop(struct net *net, unsigned int _hash) |
913 | { | |
914 | unsigned int i; | |
9fb9cbb1 | 915 | |
242922a0 FW |
916 | for (i = 0; i < NF_CT_EVICTION_RANGE; i++) { |
917 | struct hlist_nulls_head *ct_hash; | |
92e47ba8 | 918 | unsigned int hash, hsize, drops; |
242922a0 | 919 | |
3101e0fc | 920 | rcu_read_lock(); |
92e47ba8 LZ |
921 | nf_conntrack_get_ht(&ct_hash, &hsize); |
922 | hash = reciprocal_scale(_hash++, hsize); | |
242922a0 FW |
923 | |
924 | drops = early_drop_list(net, &ct_hash[hash]); | |
3101e0fc LZ |
925 | rcu_read_unlock(); |
926 | ||
242922a0 FW |
927 | if (drops) { |
928 | NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); | |
929 | return true; | |
74138511 | 930 | } |
9fb9cbb1 | 931 | } |
3e86638e | 932 | |
242922a0 | 933 | return false; |
9fb9cbb1 YK |
934 | } |
935 | ||
b87a2f91 FW |
936 | static void gc_worker(struct work_struct *work) |
937 | { | |
938 | unsigned int i, goal, buckets = 0, expired_count = 0; | |
939 | unsigned long next_run = GC_INTERVAL; | |
c023c0e4 | 940 | unsigned int ratio, scanned = 0; |
b87a2f91 FW |
941 | struct conntrack_gc_work *gc_work; |
942 | ||
943 | gc_work = container_of(work, struct conntrack_gc_work, dwork.work); | |
944 | ||
945 | goal = min(nf_conntrack_htable_size / GC_MAX_BUCKETS_DIV, GC_MAX_BUCKETS); | |
946 | i = gc_work->last_bucket; | |
947 | ||
948 | do { | |
949 | struct nf_conntrack_tuple_hash *h; | |
950 | struct hlist_nulls_head *ct_hash; | |
951 | struct hlist_nulls_node *n; | |
952 | unsigned int hashsz; | |
953 | struct nf_conn *tmp; | |
954 | ||
955 | i++; | |
956 | rcu_read_lock(); | |
957 | ||
958 | nf_conntrack_get_ht(&ct_hash, &hashsz); | |
959 | if (i >= hashsz) | |
960 | i = 0; | |
961 | ||
962 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { | |
963 | tmp = nf_ct_tuplehash_to_ctrack(h); | |
964 | ||
c023c0e4 | 965 | scanned++; |
b87a2f91 FW |
966 | if (nf_ct_is_expired(tmp)) { |
967 | nf_ct_gc_expired(tmp); | |
968 | expired_count++; | |
969 | continue; | |
970 | } | |
971 | } | |
972 | ||
973 | /* could check get_nulls_value() here and restart if ct | |
974 | * was moved to another chain. But given gc is best-effort | |
975 | * we will just continue with next hash slot. | |
976 | */ | |
977 | rcu_read_unlock(); | |
978 | cond_resched_rcu_qs(); | |
979 | } while (++buckets < goal && | |
980 | expired_count < GC_MAX_EVICTS); | |
981 | ||
982 | if (gc_work->exiting) | |
983 | return; | |
984 | ||
c023c0e4 FW |
985 | ratio = scanned ? expired_count * 100 / scanned : 0; |
986 | if (ratio >= 90) | |
987 | next_run = 0; | |
988 | ||
b87a2f91 FW |
989 | gc_work->last_bucket = i; |
990 | schedule_delayed_work(&gc_work->dwork, next_run); | |
991 | } | |
992 | ||
993 | static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work) | |
994 | { | |
995 | INIT_DELAYED_WORK(&gc_work->dwork, gc_worker); | |
996 | gc_work->exiting = false; | |
997 | } | |
998 | ||
99f07e91 | 999 | static struct nf_conn * |
308ac914 DB |
1000 | __nf_conntrack_alloc(struct net *net, |
1001 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1002 | const struct nf_conntrack_tuple *orig, |
1003 | const struct nf_conntrack_tuple *repl, | |
1004 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 1005 | { |
cd7fcbf1 | 1006 | struct nf_conn *ct; |
9fb9cbb1 | 1007 | |
5251e2d2 | 1008 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 1009 | atomic_inc(&net->ct.count); |
5251e2d2 | 1010 | |
76eb9460 | 1011 | if (nf_conntrack_max && |
49ac8713 | 1012 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
93bb0ceb | 1013 | if (!early_drop(net, hash)) { |
49ac8713 | 1014 | atomic_dec(&net->ct.count); |
e87cc472 | 1015 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
1016 | return ERR_PTR(-ENOMEM); |
1017 | } | |
1018 | } | |
1019 | ||
941297f4 ED |
1020 | /* |
1021 | * Do not use kmem_cache_zalloc(), as this cache uses | |
1022 | * SLAB_DESTROY_BY_RCU. | |
1023 | */ | |
0c5366b3 | 1024 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); |
5e8018fc DB |
1025 | if (ct == NULL) |
1026 | goto out; | |
1027 | ||
440f0d58 | 1028 | spin_lock_init(&ct->lock); |
c88130bc | 1029 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 1030 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 1031 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
1032 | /* save hash for reusing when confirming */ |
1033 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
c41884ce | 1034 | ct->status = 0; |
c2d9ba9b | 1035 | write_pnet(&ct->ct_net, net); |
c41884ce FW |
1036 | memset(&ct->__nfct_init_offset[0], 0, |
1037 | offsetof(struct nf_conn, proto) - | |
1038 | offsetof(struct nf_conn, __nfct_init_offset[0])); | |
5e8018fc | 1039 | |
6c8dee98 | 1040 | nf_ct_zone_add(ct, zone); |
5e8018fc | 1041 | |
e53376be PNA |
1042 | /* Because we use RCU lookups, we set ct_general.use to zero before |
1043 | * this is inserted in any list. | |
941297f4 | 1044 | */ |
e53376be | 1045 | atomic_set(&ct->ct_general.use, 0); |
c88130bc | 1046 | return ct; |
5e8018fc DB |
1047 | out: |
1048 | atomic_dec(&net->ct.count); | |
5d0aa2cc | 1049 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 1050 | } |
99f07e91 | 1051 | |
308ac914 DB |
1052 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
1053 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1054 | const struct nf_conntrack_tuple *orig, |
1055 | const struct nf_conntrack_tuple *repl, | |
1056 | gfp_t gfp) | |
1057 | { | |
1058 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
1059 | } | |
13b18339 | 1060 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 1061 | |
c88130bc | 1062 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 1063 | { |
1d45209d ED |
1064 | struct net *net = nf_ct_net(ct); |
1065 | ||
e53376be PNA |
1066 | /* A freed object has refcnt == 0, that's |
1067 | * the golden rule for SLAB_DESTROY_BY_RCU | |
1068 | */ | |
1069 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); | |
1070 | ||
ceeff754 | 1071 | nf_ct_ext_destroy(ct); |
ea781f19 | 1072 | nf_ct_ext_free(ct); |
0c5366b3 | 1073 | kmem_cache_free(nf_conntrack_cachep, ct); |
4e857c58 | 1074 | smp_mb__before_atomic(); |
0c3c6c00 | 1075 | atomic_dec(&net->ct.count); |
76507f69 | 1076 | } |
13b18339 | 1077 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 1078 | |
c539f017 | 1079 | |
9fb9cbb1 YK |
1080 | /* Allocate a new conntrack: we return -ENOMEM if classification |
1081 | failed due to stress. Otherwise it really is unclassifiable. */ | |
1082 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 1083 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 1084 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 1085 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 1086 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 1087 | struct sk_buff *skb, |
60b5f8f7 | 1088 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 1089 | { |
c88130bc | 1090 | struct nf_conn *ct; |
3c158f7f | 1091 | struct nf_conn_help *help; |
9fb9cbb1 | 1092 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 1093 | struct nf_conntrack_ecache *ecache; |
ca7433df | 1094 | struct nf_conntrack_expect *exp = NULL; |
308ac914 | 1095 | const struct nf_conntrack_zone *zone; |
60b5f8f7 | 1096 | struct nf_conn_timeout *timeout_ext; |
5e8018fc | 1097 | struct nf_conntrack_zone tmp; |
60b5f8f7 | 1098 | unsigned int *timeouts; |
9fb9cbb1 | 1099 | |
605dcad6 | 1100 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 1101 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
1102 | return NULL; |
1103 | } | |
1104 | ||
5e8018fc | 1105 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
99f07e91 CG |
1106 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
1107 | hash); | |
0a9ee813 | 1108 | if (IS_ERR(ct)) |
c88130bc | 1109 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 1110 | |
48b1de4c PM |
1111 | if (tmpl && nfct_synproxy(tmpl)) { |
1112 | nfct_seqadj_ext_add(ct); | |
1113 | nfct_synproxy_ext_add(ct); | |
1114 | } | |
1115 | ||
60b5f8f7 | 1116 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
ae2d708e PNA |
1117 | if (timeout_ext) { |
1118 | timeouts = nf_ct_timeout_data(timeout_ext); | |
1119 | if (unlikely(!timeouts)) | |
1120 | timeouts = l4proto->get_timeouts(net); | |
1121 | } else { | |
60b5f8f7 | 1122 | timeouts = l4proto->get_timeouts(net); |
ae2d708e | 1123 | } |
60b5f8f7 | 1124 | |
2c8503f5 | 1125 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 1126 | nf_conntrack_free(ct); |
ccd63c20 | 1127 | pr_debug("can't track with proto module\n"); |
9fb9cbb1 YK |
1128 | return NULL; |
1129 | } | |
1130 | ||
60b5f8f7 | 1131 | if (timeout_ext) |
ae2d708e PNA |
1132 | nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout), |
1133 | GFP_ATOMIC); | |
60b5f8f7 | 1134 | |
58401572 | 1135 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 1136 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 1137 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
1138 | |
1139 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
1140 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
1141 | ecache ? ecache->expmask : 0, | |
1142 | GFP_ATOMIC); | |
58401572 | 1143 | |
ca7433df JDB |
1144 | local_bh_disable(); |
1145 | if (net->ct.expect_count) { | |
1146 | spin_lock(&nf_conntrack_expect_lock); | |
1147 | exp = nf_ct_find_expectation(net, zone, tuple); | |
1148 | if (exp) { | |
ccd63c20 | 1149 | pr_debug("expectation arrives ct=%p exp=%p\n", |
ca7433df JDB |
1150 | ct, exp); |
1151 | /* Welcome, Mr. Bond. We've been expecting you... */ | |
1152 | __set_bit(IPS_EXPECTED_BIT, &ct->status); | |
1153 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ | |
1154 | ct->master = exp->master; | |
1155 | if (exp->helper) { | |
1156 | help = nf_ct_helper_ext_add(ct, exp->helper, | |
1157 | GFP_ATOMIC); | |
1158 | if (help) | |
1159 | rcu_assign_pointer(help->helper, exp->helper); | |
1160 | } | |
ceceae1b | 1161 | |
9fb9cbb1 | 1162 | #ifdef CONFIG_NF_CONNTRACK_MARK |
ca7433df | 1163 | ct->mark = exp->master->mark; |
7c9728c3 JM |
1164 | #endif |
1165 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
ca7433df | 1166 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 1167 | #endif |
ca7433df JDB |
1168 | NF_CT_STAT_INC(net, expect_new); |
1169 | } | |
1170 | spin_unlock(&nf_conntrack_expect_lock); | |
1171 | } | |
8e8118f8 | 1172 | if (!exp) |
b2a15a60 | 1173 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
9fb9cbb1 | 1174 | |
e53376be PNA |
1175 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
1176 | nf_conntrack_get(&ct->ct_general); | |
b7779d06 | 1177 | nf_ct_add_to_unconfirmed_list(ct); |
9fb9cbb1 | 1178 | |
ca7433df | 1179 | local_bh_enable(); |
9fb9cbb1 YK |
1180 | |
1181 | if (exp) { | |
1182 | if (exp->expectfn) | |
c88130bc | 1183 | exp->expectfn(ct, exp); |
6823645d | 1184 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
1185 | } |
1186 | ||
c88130bc | 1187 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
1188 | } |
1189 | ||
1190 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
1191 | static inline struct nf_conn * | |
b2a15a60 | 1192 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 1193 | struct sk_buff *skb, |
9fb9cbb1 YK |
1194 | unsigned int dataoff, |
1195 | u_int16_t l3num, | |
1196 | u_int8_t protonum, | |
1197 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 1198 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 1199 | int *set_reply, |
60b5f8f7 | 1200 | enum ip_conntrack_info *ctinfo) |
9fb9cbb1 | 1201 | { |
308ac914 | 1202 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 YK |
1203 | struct nf_conntrack_tuple tuple; |
1204 | struct nf_conntrack_tuple_hash *h; | |
5e8018fc | 1205 | struct nf_conntrack_zone tmp; |
9fb9cbb1 | 1206 | struct nf_conn *ct; |
99f07e91 | 1207 | u32 hash; |
9fb9cbb1 | 1208 | |
bbe735e4 | 1209 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
a31f1adc | 1210 | dataoff, l3num, protonum, net, &tuple, l3proto, |
605dcad6 | 1211 | l4proto)) { |
ccd63c20 | 1212 | pr_debug("Can't get tuple\n"); |
9fb9cbb1 YK |
1213 | return NULL; |
1214 | } | |
1215 | ||
1216 | /* look for tuple match */ | |
5e8018fc | 1217 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
1b8c8a9f | 1218 | hash = hash_conntrack_raw(&tuple, net); |
99f07e91 | 1219 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
9fb9cbb1 | 1220 | if (!h) { |
b2a15a60 | 1221 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 1222 | skb, dataoff, hash); |
9fb9cbb1 YK |
1223 | if (!h) |
1224 | return NULL; | |
1225 | if (IS_ERR(h)) | |
1226 | return (void *)h; | |
1227 | } | |
1228 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1229 | ||
1230 | /* It exists; we have (non-exclusive) reference. */ | |
1231 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fb048833 | 1232 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
1233 | /* Please set reply bit if this packet OK */ |
1234 | *set_reply = 1; | |
1235 | } else { | |
1236 | /* Once we've had two way comms, always ESTABLISHED. */ | |
1237 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
ccd63c20 | 1238 | pr_debug("normal packet for %p\n", ct); |
9fb9cbb1 YK |
1239 | *ctinfo = IP_CT_ESTABLISHED; |
1240 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
ccd63c20 | 1241 | pr_debug("related packet for %p\n", ct); |
9fb9cbb1 YK |
1242 | *ctinfo = IP_CT_RELATED; |
1243 | } else { | |
ccd63c20 | 1244 | pr_debug("new packet for %p\n", ct); |
9fb9cbb1 YK |
1245 | *ctinfo = IP_CT_NEW; |
1246 | } | |
1247 | *set_reply = 0; | |
1248 | } | |
1249 | skb->nfct = &ct->ct_general; | |
1250 | skb->nfctinfo = *ctinfo; | |
1251 | return ct; | |
1252 | } | |
1253 | ||
1254 | unsigned int | |
a702a65f AD |
1255 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
1256 | struct sk_buff *skb) | |
9fb9cbb1 | 1257 | { |
b2a15a60 | 1258 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
1259 | enum ip_conntrack_info ctinfo; |
1260 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 1261 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 1262 | unsigned int *timeouts; |
9fb9cbb1 YK |
1263 | unsigned int dataoff; |
1264 | u_int8_t protonum; | |
1265 | int set_reply = 0; | |
1266 | int ret; | |
1267 | ||
3db05fea | 1268 | if (skb->nfct) { |
b2a15a60 PM |
1269 | /* Previously seen (loopback or untracked)? Ignore. */ |
1270 | tmpl = (struct nf_conn *)skb->nfct; | |
1271 | if (!nf_ct_is_template(tmpl)) { | |
1272 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
1273 | return NF_ACCEPT; | |
1274 | } | |
1275 | skb->nfct = NULL; | |
9fb9cbb1 YK |
1276 | } |
1277 | ||
923f4902 | 1278 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 1279 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 1280 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
1281 | &dataoff, &protonum); |
1282 | if (ret <= 0) { | |
25985edc | 1283 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
1284 | NF_CT_STAT_INC_ATOMIC(net, error); |
1285 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1286 | ret = -ret; |
1287 | goto out; | |
9fb9cbb1 YK |
1288 | } |
1289 | ||
76108cea | 1290 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
1291 | |
1292 | /* It may be an special packet, error, unclean... | |
1293 | * inverse of the return code tells to the netfilter | |
1294 | * core what to do with the packet. */ | |
74c51a14 | 1295 | if (l4proto->error != NULL) { |
8fea97ec PM |
1296 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
1297 | pf, hooknum); | |
74c51a14 | 1298 | if (ret <= 0) { |
0d55af87 AD |
1299 | NF_CT_STAT_INC_ATOMIC(net, error); |
1300 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1301 | ret = -ret; |
1302 | goto out; | |
74c51a14 | 1303 | } |
88ed01d1 PNA |
1304 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
1305 | if (skb->nfct) | |
1306 | goto out; | |
9fb9cbb1 YK |
1307 | } |
1308 | ||
b2a15a60 | 1309 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
60b5f8f7 | 1310 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
1311 | if (!ct) { |
1312 | /* Not valid part of a connection */ | |
0d55af87 | 1313 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
1314 | ret = NF_ACCEPT; |
1315 | goto out; | |
9fb9cbb1 YK |
1316 | } |
1317 | ||
1318 | if (IS_ERR(ct)) { | |
1319 | /* Too stressed to deal. */ | |
0d55af87 | 1320 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
1321 | ret = NF_DROP; |
1322 | goto out; | |
9fb9cbb1 YK |
1323 | } |
1324 | ||
3db05fea | 1325 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 1326 | |
60b5f8f7 | 1327 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1328 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1329 | |
2c8503f5 | 1330 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1331 | if (ret <= 0) { |
9fb9cbb1 YK |
1332 | /* Invalid: inverse of the return code tells |
1333 | * the netfilter core what to do */ | |
0d53778e | 1334 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
1335 | nf_conntrack_put(skb->nfct); |
1336 | skb->nfct = NULL; | |
0d55af87 | 1337 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1338 | if (ret == -NF_DROP) |
1339 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
1340 | ret = -ret; |
1341 | goto out; | |
9fb9cbb1 YK |
1342 | } |
1343 | ||
1344 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1345 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1346 | out: |
c3174286 PNA |
1347 | if (tmpl) { |
1348 | /* Special case: we have to repeat this hook, assign the | |
1349 | * template again to this packet. We assume that this packet | |
1350 | * has no conntrack assigned. This is used by nf_ct_tcp. */ | |
1351 | if (ret == NF_REPEAT) | |
1352 | skb->nfct = (struct nf_conntrack *)tmpl; | |
1353 | else | |
1354 | nf_ct_put(tmpl); | |
1355 | } | |
9fb9cbb1 YK |
1356 | |
1357 | return ret; | |
1358 | } | |
13b18339 | 1359 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1360 | |
5f2b4c90 JE |
1361 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1362 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1363 | { |
5f2b4c90 | 1364 | bool ret; |
923f4902 PM |
1365 | |
1366 | rcu_read_lock(); | |
1367 | ret = nf_ct_invert_tuple(inverse, orig, | |
1368 | __nf_ct_l3proto_find(orig->src.l3num), | |
1369 | __nf_ct_l4proto_find(orig->src.l3num, | |
1370 | orig->dst.protonum)); | |
1371 | rcu_read_unlock(); | |
1372 | return ret; | |
9fb9cbb1 | 1373 | } |
13b18339 | 1374 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1375 | |
5b1158e9 JK |
1376 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1377 | implicitly racy: see __nf_conntrack_confirm */ | |
1378 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1379 | const struct nf_conntrack_tuple *newreply) | |
1380 | { | |
1381 | struct nf_conn_help *help = nfct_help(ct); | |
1382 | ||
5b1158e9 JK |
1383 | /* Should be unconfirmed, so not in hash table yet */ |
1384 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1385 | ||
0d53778e | 1386 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1387 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1388 | |
1389 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1390 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1391 | return; |
ceceae1b | 1392 | |
c52fbb41 | 1393 | rcu_read_lock(); |
b2a15a60 | 1394 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1395 | rcu_read_unlock(); |
5b1158e9 | 1396 | } |
13b18339 | 1397 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1398 | |
9fb9cbb1 YK |
1399 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1400 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1401 | enum ip_conntrack_info ctinfo, | |
1402 | const struct sk_buff *skb, | |
1403 | unsigned long extra_jiffies, | |
1404 | int do_acct) | |
1405 | { | |
9fb9cbb1 YK |
1406 | NF_CT_ASSERT(skb); |
1407 | ||
997ae831 | 1408 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1409 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1410 | goto acct; | |
997ae831 | 1411 | |
9fb9cbb1 | 1412 | /* If not in hash table, timer will not be active yet */ |
f330a7fd FW |
1413 | if (nf_ct_is_confirmed(ct)) |
1414 | extra_jiffies += nfct_time_stamp; | |
9fb9cbb1 | 1415 | |
f330a7fd | 1416 | ct->timeout = extra_jiffies; |
47d95045 | 1417 | acct: |
ba76738c PNA |
1418 | if (do_acct) |
1419 | nf_ct_acct_update(ct, ctinfo, skb->len); | |
9fb9cbb1 | 1420 | } |
13b18339 | 1421 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1422 | |
ad66713f FW |
1423 | bool nf_ct_kill_acct(struct nf_conn *ct, |
1424 | enum ip_conntrack_info ctinfo, | |
1425 | const struct sk_buff *skb) | |
51091764 | 1426 | { |
ad66713f | 1427 | nf_ct_acct_update(ct, ctinfo, skb->len); |
58401572 | 1428 | |
f330a7fd | 1429 | return nf_ct_delete(ct, 0, 0); |
51091764 | 1430 | } |
ad66713f | 1431 | EXPORT_SYMBOL_GPL(nf_ct_kill_acct); |
51091764 | 1432 | |
c0cd1156 | 1433 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1434 | |
1435 | #include <linux/netfilter/nfnetlink.h> | |
1436 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1437 | #include <linux/mutex.h> |
1438 | ||
c1d10adb PNA |
1439 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1440 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1441 | * or depend on ctnetlink */ | |
fdf70832 | 1442 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1443 | const struct nf_conntrack_tuple *tuple) |
1444 | { | |
bae65be8 DM |
1445 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1446 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1447 | goto nla_put_failure; | |
c1d10adb PNA |
1448 | return 0; |
1449 | ||
df6fb868 | 1450 | nla_put_failure: |
c1d10adb PNA |
1451 | return -1; |
1452 | } | |
fdf70832 | 1453 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1454 | |
f73e924c PM |
1455 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1456 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1457 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1458 | }; |
f73e924c | 1459 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1460 | |
fdf70832 | 1461 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1462 | struct nf_conntrack_tuple *t) |
1463 | { | |
df6fb868 | 1464 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1465 | return -EINVAL; |
1466 | ||
77236b6e PM |
1467 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1468 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1469 | |
1470 | return 0; | |
1471 | } | |
fdf70832 | 1472 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1473 | |
1474 | int nf_ct_port_nlattr_tuple_size(void) | |
1475 | { | |
1476 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1477 | } | |
1478 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1479 | #endif |
1480 | ||
9fb9cbb1 | 1481 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1482 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1483 | { |
1484 | struct nf_conn *ct; | |
1485 | enum ip_conntrack_info ctinfo; | |
1486 | ||
1487 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1488 | ct = nf_ct_get(skb, &ctinfo); | |
1489 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1490 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1491 | else |
1492 | ctinfo = IP_CT_RELATED; | |
1493 | ||
1494 | /* Attach to new skbuff, and increment count */ | |
1495 | nskb->nfct = &ct->ct_general; | |
1496 | nskb->nfctinfo = ctinfo; | |
1497 | nf_conntrack_get(nskb->nfct); | |
1498 | } | |
1499 | ||
9fb9cbb1 | 1500 | /* Bring out ya dead! */ |
df0933dc | 1501 | static struct nf_conn * |
400dad39 | 1502 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1503 | void *data, unsigned int *bucket) |
1504 | { | |
df0933dc PM |
1505 | struct nf_conntrack_tuple_hash *h; |
1506 | struct nf_conn *ct; | |
ea781f19 | 1507 | struct hlist_nulls_node *n; |
b7779d06 | 1508 | int cpu; |
93bb0ceb | 1509 | spinlock_t *lockp; |
9fb9cbb1 | 1510 | |
56d52d48 | 1511 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
93bb0ceb JDB |
1512 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
1513 | local_bh_disable(); | |
b16c2919 | 1514 | nf_conntrack_lock(lockp); |
56d52d48 FW |
1515 | if (*bucket < nf_conntrack_htable_size) { |
1516 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) { | |
93bb0ceb JDB |
1517 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1518 | continue; | |
1519 | ct = nf_ct_tuplehash_to_ctrack(h); | |
e0c7d472 FW |
1520 | if (net_eq(nf_ct_net(ct), net) && |
1521 | iter(ct, data)) | |
93bb0ceb JDB |
1522 | goto found; |
1523 | } | |
df0933dc | 1524 | } |
93bb0ceb JDB |
1525 | spin_unlock(lockp); |
1526 | local_bh_enable(); | |
d93c6258 | 1527 | cond_resched(); |
601e68e1 | 1528 | } |
b7779d06 JDB |
1529 | |
1530 | for_each_possible_cpu(cpu) { | |
1531 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1532 | ||
1533 | spin_lock_bh(&pcpu->lock); | |
1534 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { | |
1535 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1536 | if (iter(ct, data)) | |
1537 | set_bit(IPS_DYING_BIT, &ct->status); | |
1538 | } | |
1539 | spin_unlock_bh(&pcpu->lock); | |
d93c6258 | 1540 | cond_resched(); |
b7779d06 | 1541 | } |
df0933dc PM |
1542 | return NULL; |
1543 | found: | |
c073e3fa | 1544 | atomic_inc(&ct->ct_general.use); |
93bb0ceb JDB |
1545 | spin_unlock(lockp); |
1546 | local_bh_enable(); | |
df0933dc | 1547 | return ct; |
9fb9cbb1 YK |
1548 | } |
1549 | ||
400dad39 AD |
1550 | void nf_ct_iterate_cleanup(struct net *net, |
1551 | int (*iter)(struct nf_conn *i, void *data), | |
c655bc68 | 1552 | void *data, u32 portid, int report) |
9fb9cbb1 | 1553 | { |
df0933dc | 1554 | struct nf_conn *ct; |
9fb9cbb1 YK |
1555 | unsigned int bucket = 0; |
1556 | ||
d93c6258 FW |
1557 | might_sleep(); |
1558 | ||
88b68bc5 FW |
1559 | if (atomic_read(&net->ct.count) == 0) |
1560 | return; | |
1561 | ||
400dad39 | 1562 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 | 1563 | /* Time to push up daises... */ |
9fb9cbb1 | 1564 | |
f330a7fd | 1565 | nf_ct_delete(ct, portid, report); |
9fb9cbb1 | 1566 | nf_ct_put(ct); |
d93c6258 | 1567 | cond_resched(); |
9fb9cbb1 YK |
1568 | } |
1569 | } | |
13b18339 | 1570 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1571 | |
274d383b PNA |
1572 | static int kill_all(struct nf_conn *i, void *data) |
1573 | { | |
1574 | return 1; | |
1575 | } | |
1576 | ||
d862a662 | 1577 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1578 | { |
d862a662 | 1579 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1580 | vfree(hash); |
1581 | else | |
601e68e1 | 1582 | free_pages((unsigned long)hash, |
f205c5e0 | 1583 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1584 | } |
ac565e5f | 1585 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1586 | |
b3c5163f ED |
1587 | static int untrack_refs(void) |
1588 | { | |
1589 | int cnt = 0, cpu; | |
1590 | ||
1591 | for_each_possible_cpu(cpu) { | |
1592 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1593 | ||
1594 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1595 | } | |
1596 | return cnt; | |
1597 | } | |
1598 | ||
f94161c1 | 1599 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1600 | { |
b87a2f91 | 1601 | conntrack_gc_work.exiting = true; |
f94161c1 G |
1602 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1603 | } | |
1604 | ||
1605 | void nf_conntrack_cleanup_end(void) | |
1606 | { | |
1607 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1608 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1609 | schedule(); |
1610 | ||
b87a2f91 | 1611 | cancel_delayed_work_sync(&conntrack_gc_work.dwork); |
56d52d48 FW |
1612 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
1613 | ||
04d87001 | 1614 | nf_conntrack_proto_fini(); |
41d73ec0 | 1615 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 1616 | nf_conntrack_labels_fini(); |
5e615b22 | 1617 | nf_conntrack_helper_fini(); |
8684094c | 1618 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1619 | nf_conntrack_ecache_fini(); |
73f4001a | 1620 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1621 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1622 | nf_conntrack_expect_fini(); |
77571149 FW |
1623 | |
1624 | kmem_cache_destroy(nf_conntrack_cachep); | |
08f6547d | 1625 | } |
9fb9cbb1 | 1626 | |
f94161c1 G |
1627 | /* |
1628 | * Mishearing the voices in his head, our hero wonders how he's | |
1629 | * supposed to kill the mall. | |
1630 | */ | |
1631 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1632 | { |
dece40e8 VD |
1633 | LIST_HEAD(single); |
1634 | ||
1635 | list_add(&net->exit_list, &single); | |
1636 | nf_conntrack_cleanup_net_list(&single); | |
1637 | } | |
1638 | ||
1639 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1640 | { | |
1641 | int busy; | |
1642 | struct net *net; | |
1643 | ||
f94161c1 G |
1644 | /* |
1645 | * This makes sure all current packets have passed through | |
1646 | * netfilter framework. Roll on, two-stage module | |
1647 | * delete... | |
1648 | */ | |
1649 | synchronize_net(); | |
dece40e8 VD |
1650 | i_see_dead_people: |
1651 | busy = 0; | |
1652 | list_for_each_entry(net, net_exit_list, exit_list) { | |
c655bc68 | 1653 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
dece40e8 VD |
1654 | if (atomic_read(&net->ct.count) != 0) |
1655 | busy = 1; | |
1656 | } | |
1657 | if (busy) { | |
9fb9cbb1 YK |
1658 | schedule(); |
1659 | goto i_see_dead_people; | |
1660 | } | |
1661 | ||
dece40e8 | 1662 | list_for_each_entry(net, net_exit_list, exit_list) { |
dece40e8 VD |
1663 | nf_conntrack_proto_pernet_fini(net); |
1664 | nf_conntrack_helper_pernet_fini(net); | |
1665 | nf_conntrack_ecache_pernet_fini(net); | |
1666 | nf_conntrack_tstamp_pernet_fini(net); | |
1667 | nf_conntrack_acct_pernet_fini(net); | |
1668 | nf_conntrack_expect_pernet_fini(net); | |
dece40e8 | 1669 | free_percpu(net->ct.stat); |
b7779d06 | 1670 | free_percpu(net->ct.pcpu_lists); |
dece40e8 | 1671 | } |
08f6547d AD |
1672 | } |
1673 | ||
d862a662 | 1674 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1675 | { |
ea781f19 ED |
1676 | struct hlist_nulls_head *hash; |
1677 | unsigned int nr_slots, i; | |
1678 | size_t sz; | |
9fb9cbb1 | 1679 | |
9cc1c73a FW |
1680 | if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) |
1681 | return NULL; | |
1682 | ||
ea781f19 ED |
1683 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1684 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
9cc1c73a FW |
1685 | |
1686 | if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head))) | |
1687 | return NULL; | |
1688 | ||
ea781f19 ED |
1689 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
1690 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1691 | get_order(sz)); | |
f0ad4621 | 1692 | if (!hash) |
966567b7 | 1693 | hash = vzalloc(sz); |
9fb9cbb1 | 1694 | |
ea781f19 ED |
1695 | if (hash && nulls) |
1696 | for (i = 0; i < nr_slots; i++) | |
1697 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1698 | |
1699 | return hash; | |
1700 | } | |
ac565e5f | 1701 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1702 | |
3183ab89 | 1703 | int nf_conntrack_hash_resize(unsigned int hashsize) |
9fb9cbb1 | 1704 | { |
3183ab89 FW |
1705 | int i, bucket; |
1706 | unsigned int old_size; | |
ea781f19 | 1707 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1708 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1709 | struct nf_conn *ct; |
9fb9cbb1 | 1710 | |
9fb9cbb1 YK |
1711 | if (!hashsize) |
1712 | return -EINVAL; | |
1713 | ||
d862a662 | 1714 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1715 | if (!hash) |
1716 | return -ENOMEM; | |
1717 | ||
3183ab89 FW |
1718 | old_size = nf_conntrack_htable_size; |
1719 | if (old_size == hashsize) { | |
1720 | nf_ct_free_hashtable(hash, hashsize); | |
1721 | return 0; | |
1722 | } | |
1723 | ||
93bb0ceb JDB |
1724 | local_bh_disable(); |
1725 | nf_conntrack_all_lock(); | |
a3efd812 | 1726 | write_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb | 1727 | |
76507f69 PM |
1728 | /* Lookups in the old hash might happen in parallel, which means we |
1729 | * might get false negatives during connection lookup. New connections | |
1730 | * created because of a false negative won't make it into the hash | |
93bb0ceb | 1731 | * though since that required taking the locks. |
76507f69 | 1732 | */ |
93bb0ceb | 1733 | |
56d52d48 FW |
1734 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
1735 | while (!hlist_nulls_empty(&nf_conntrack_hash[i])) { | |
1736 | h = hlist_nulls_entry(nf_conntrack_hash[i].first, | |
1737 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1738 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1739 | hlist_nulls_del_rcu(&h->hnnode); |
1b8c8a9f FW |
1740 | bucket = __hash_conntrack(nf_ct_net(ct), |
1741 | &h->tuple, hashsize); | |
ea781f19 | 1742 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1743 | } |
1744 | } | |
56d52d48 FW |
1745 | old_size = nf_conntrack_htable_size; |
1746 | old_hash = nf_conntrack_hash; | |
9fb9cbb1 | 1747 | |
56d52d48 FW |
1748 | nf_conntrack_hash = hash; |
1749 | nf_conntrack_htable_size = hashsize; | |
93bb0ceb | 1750 | |
a3efd812 | 1751 | write_seqcount_end(&nf_conntrack_generation); |
93bb0ceb JDB |
1752 | nf_conntrack_all_unlock(); |
1753 | local_bh_enable(); | |
9fb9cbb1 | 1754 | |
5e3c61f9 | 1755 | synchronize_net(); |
d862a662 | 1756 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1757 | return 0; |
1758 | } | |
3183ab89 FW |
1759 | |
1760 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) | |
1761 | { | |
1762 | unsigned int hashsize; | |
1763 | int rc; | |
1764 | ||
1765 | if (current->nsproxy->net_ns != &init_net) | |
1766 | return -EOPNOTSUPP; | |
1767 | ||
1768 | /* On boot, we can set this without any fancy locking. */ | |
1769 | if (!nf_conntrack_htable_size) | |
1770 | return param_set_uint(val, kp); | |
1771 | ||
1772 | rc = kstrtouint(val, 0, &hashsize); | |
1773 | if (rc) | |
1774 | return rc; | |
1775 | ||
1776 | return nf_conntrack_hash_resize(hashsize); | |
1777 | } | |
fae718dd | 1778 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1779 | |
fae718dd | 1780 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1781 | &nf_conntrack_htable_size, 0600); |
1782 | ||
5bfddbd4 ED |
1783 | void nf_ct_untracked_status_or(unsigned long bits) |
1784 | { | |
b3c5163f ED |
1785 | int cpu; |
1786 | ||
1787 | for_each_possible_cpu(cpu) | |
1788 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1789 | } |
1790 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1791 | ||
f94161c1 | 1792 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1793 | { |
f205c5e0 | 1794 | int max_factor = 8; |
0c5366b3 FW |
1795 | int ret = -ENOMEM; |
1796 | int i, cpu; | |
93bb0ceb | 1797 | |
a3efd812 FW |
1798 | seqcount_init(&nf_conntrack_generation); |
1799 | ||
d5d20912 | 1800 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
93bb0ceb | 1801 | spin_lock_init(&nf_conntrack_locks[i]); |
9fb9cbb1 | 1802 | |
9fb9cbb1 | 1803 | if (!nf_conntrack_htable_size) { |
88eab472 ML |
1804 | /* Idea from tcp.c: use 1/16384 of memory. |
1805 | * On i386: 32MB machine has 512 buckets. | |
1806 | * >= 1GB machines have 16384 buckets. | |
1807 | * >= 4GB machines have 65536 buckets. | |
1808 | */ | |
9fb9cbb1 | 1809 | nf_conntrack_htable_size |
4481374c | 1810 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1811 | / sizeof(struct hlist_head)); |
88eab472 ML |
1812 | if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
1813 | nf_conntrack_htable_size = 65536; | |
1814 | else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) | |
f205c5e0 PM |
1815 | nf_conntrack_htable_size = 16384; |
1816 | if (nf_conntrack_htable_size < 32) | |
1817 | nf_conntrack_htable_size = 32; | |
1818 | ||
1819 | /* Use a max. factor of four by default to get the same max as | |
1820 | * with the old struct list_heads. When a table size is given | |
1821 | * we use the old value of 8 to avoid reducing the max. | |
1822 | * entries. */ | |
1823 | max_factor = 4; | |
9fb9cbb1 | 1824 | } |
56d52d48 FW |
1825 | |
1826 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1); | |
1827 | if (!nf_conntrack_hash) | |
1828 | return -ENOMEM; | |
1829 | ||
f205c5e0 | 1830 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1831 | |
0c5366b3 FW |
1832 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
1833 | sizeof(struct nf_conn), 0, | |
5a75cdeb | 1834 | SLAB_DESTROY_BY_RCU | SLAB_HWCACHE_ALIGN, NULL); |
0c5366b3 FW |
1835 | if (!nf_conntrack_cachep) |
1836 | goto err_cachep; | |
1837 | ||
654d0fbd | 1838 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1839 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1840 | nf_conntrack_max); | |
83b4dbe1 G |
1841 | |
1842 | ret = nf_conntrack_expect_init(); | |
1843 | if (ret < 0) | |
1844 | goto err_expect; | |
1845 | ||
b7ff3a1f G |
1846 | ret = nf_conntrack_acct_init(); |
1847 | if (ret < 0) | |
1848 | goto err_acct; | |
1849 | ||
73f4001a G |
1850 | ret = nf_conntrack_tstamp_init(); |
1851 | if (ret < 0) | |
1852 | goto err_tstamp; | |
1853 | ||
3fe0f943 G |
1854 | ret = nf_conntrack_ecache_init(); |
1855 | if (ret < 0) | |
1856 | goto err_ecache; | |
1857 | ||
8684094c G |
1858 | ret = nf_conntrack_timeout_init(); |
1859 | if (ret < 0) | |
1860 | goto err_timeout; | |
1861 | ||
5e615b22 G |
1862 | ret = nf_conntrack_helper_init(); |
1863 | if (ret < 0) | |
1864 | goto err_helper; | |
1865 | ||
5f69b8f5 G |
1866 | ret = nf_conntrack_labels_init(); |
1867 | if (ret < 0) | |
1868 | goto err_labels; | |
1869 | ||
41d73ec0 PM |
1870 | ret = nf_conntrack_seqadj_init(); |
1871 | if (ret < 0) | |
1872 | goto err_seqadj; | |
1873 | ||
04d87001 G |
1874 | ret = nf_conntrack_proto_init(); |
1875 | if (ret < 0) | |
1876 | goto err_proto; | |
1877 | ||
9edd7ca0 | 1878 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1879 | for_each_possible_cpu(cpu) { |
1880 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1881 | write_pnet(&ct->ct_net, &init_net); |
1882 | atomic_set(&ct->ct_general.use, 1); | |
1883 | } | |
9edd7ca0 | 1884 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1885 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
b87a2f91 FW |
1886 | |
1887 | conntrack_gc_work_init(&conntrack_gc_work); | |
1888 | schedule_delayed_work(&conntrack_gc_work.dwork, GC_INTERVAL); | |
1889 | ||
08f6547d AD |
1890 | return 0; |
1891 | ||
04d87001 | 1892 | err_proto: |
41d73ec0 PM |
1893 | nf_conntrack_seqadj_fini(); |
1894 | err_seqadj: | |
04d87001 | 1895 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1896 | err_labels: |
1897 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1898 | err_helper: |
1899 | nf_conntrack_timeout_fini(); | |
8684094c G |
1900 | err_timeout: |
1901 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1902 | err_ecache: |
1903 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1904 | err_tstamp: |
1905 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1906 | err_acct: |
1907 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1908 | err_expect: |
0c5366b3 FW |
1909 | kmem_cache_destroy(nf_conntrack_cachep); |
1910 | err_cachep: | |
56d52d48 | 1911 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
08f6547d AD |
1912 | return ret; |
1913 | } | |
1914 | ||
f94161c1 G |
1915 | void nf_conntrack_init_end(void) |
1916 | { | |
1917 | /* For use by REJECT target */ | |
1918 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1919 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
f94161c1 G |
1920 | } |
1921 | ||
8cc20198 ED |
1922 | /* |
1923 | * We need to use special "null" values, not used in hash table | |
1924 | */ | |
1925 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1926 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1927 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1928 | |
f94161c1 | 1929 | int nf_conntrack_init_net(struct net *net) |
08f6547d | 1930 | { |
b7779d06 JDB |
1931 | int ret = -ENOMEM; |
1932 | int cpu; | |
ceceae1b | 1933 | |
08f6547d | 1934 | atomic_set(&net->ct.count, 0); |
b7779d06 JDB |
1935 | |
1936 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); | |
1937 | if (!net->ct.pcpu_lists) | |
08f6547d | 1938 | goto err_stat; |
b7779d06 JDB |
1939 | |
1940 | for_each_possible_cpu(cpu) { | |
1941 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1942 | ||
1943 | spin_lock_init(&pcpu->lock); | |
1944 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); | |
1945 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); | |
08f6547d | 1946 | } |
5b3501fa | 1947 | |
b7779d06 JDB |
1948 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1949 | if (!net->ct.stat) | |
1950 | goto err_pcpu_lists; | |
1951 | ||
83b4dbe1 | 1952 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1953 | if (ret < 0) |
1954 | goto err_expect; | |
b7ff3a1f | 1955 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 1956 | if (ret < 0) |
08f6547d | 1957 | goto err_acct; |
73f4001a | 1958 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
1959 | if (ret < 0) |
1960 | goto err_tstamp; | |
3fe0f943 | 1961 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
1962 | if (ret < 0) |
1963 | goto err_ecache; | |
5e615b22 | 1964 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
1965 | if (ret < 0) |
1966 | goto err_helper; | |
04d87001 | 1967 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
1968 | if (ret < 0) |
1969 | goto err_proto; | |
08f6547d | 1970 | return 0; |
c539f017 | 1971 | |
f94161c1 | 1972 | err_proto: |
5e615b22 | 1973 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 1974 | err_helper: |
3fe0f943 | 1975 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 1976 | err_ecache: |
73f4001a | 1977 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 1978 | err_tstamp: |
b7ff3a1f | 1979 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 1980 | err_acct: |
83b4dbe1 | 1981 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 1982 | err_expect: |
0d55af87 | 1983 | free_percpu(net->ct.stat); |
b7779d06 JDB |
1984 | err_pcpu_lists: |
1985 | free_percpu(net->ct.pcpu_lists); | |
0d55af87 | 1986 | err_stat: |
08f6547d AD |
1987 | return ret; |
1988 | } |