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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 | ||
b87a2f91 FW |
75 | struct conntrack_gc_work { |
76 | struct delayed_work dwork; | |
77 | u32 last_bucket; | |
78 | bool exiting; | |
e0df8cae | 79 | long next_gc_run; |
b87a2f91 FW |
80 | }; |
81 | ||
0c5366b3 | 82 | static __read_mostly struct kmem_cache *nf_conntrack_cachep; |
b16c2919 | 83 | static __read_mostly spinlock_t nf_conntrack_locks_all_lock; |
70d72b7e | 84 | static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock); |
b16c2919 SL |
85 | static __read_mostly bool nf_conntrack_locks_all; |
86 | ||
e0df8cae | 87 | /* every gc cycle scans at most 1/GC_MAX_BUCKETS_DIV part of table */ |
e5072053 FW |
88 | #define GC_MAX_BUCKETS_DIV 128u |
89 | /* upper bound of full table scan */ | |
90 | #define GC_MAX_SCAN_JIFFIES (16u * HZ) | |
91 | /* desired ratio of entries found to be expired */ | |
92 | #define GC_EVICT_RATIO 50u | |
b87a2f91 FW |
93 | |
94 | static struct conntrack_gc_work conntrack_gc_work; | |
95 | ||
b16c2919 SL |
96 | void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) |
97 | { | |
98 | spin_lock(lock); | |
99 | while (unlikely(nf_conntrack_locks_all)) { | |
100 | spin_unlock(lock); | |
b316ff78 PZ |
101 | |
102 | /* | |
103 | * Order the 'nf_conntrack_locks_all' load vs. the | |
104 | * spin_unlock_wait() loads below, to ensure | |
105 | * that 'nf_conntrack_locks_all_lock' is indeed held: | |
106 | */ | |
107 | smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ | |
e39365be | 108 | spin_unlock_wait(&nf_conntrack_locks_all_lock); |
b16c2919 SL |
109 | spin_lock(lock); |
110 | } | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); | |
113 | ||
93bb0ceb JDB |
114 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
115 | { | |
116 | h1 %= CONNTRACK_LOCKS; | |
117 | h2 %= CONNTRACK_LOCKS; | |
118 | spin_unlock(&nf_conntrack_locks[h1]); | |
119 | if (h1 != h2) | |
120 | spin_unlock(&nf_conntrack_locks[h2]); | |
121 | } | |
122 | ||
123 | /* return true if we need to recompute hashes (in case hash table was resized) */ | |
124 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, | |
125 | unsigned int h2, unsigned int sequence) | |
126 | { | |
127 | h1 %= CONNTRACK_LOCKS; | |
128 | h2 %= CONNTRACK_LOCKS; | |
129 | if (h1 <= h2) { | |
b16c2919 | 130 | nf_conntrack_lock(&nf_conntrack_locks[h1]); |
93bb0ceb JDB |
131 | if (h1 != h2) |
132 | spin_lock_nested(&nf_conntrack_locks[h2], | |
133 | SINGLE_DEPTH_NESTING); | |
134 | } else { | |
b16c2919 | 135 | nf_conntrack_lock(&nf_conntrack_locks[h2]); |
93bb0ceb JDB |
136 | spin_lock_nested(&nf_conntrack_locks[h1], |
137 | SINGLE_DEPTH_NESTING); | |
138 | } | |
a3efd812 | 139 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
93bb0ceb JDB |
140 | nf_conntrack_double_unlock(h1, h2); |
141 | return true; | |
142 | } | |
143 | return false; | |
144 | } | |
145 | ||
146 | static void nf_conntrack_all_lock(void) | |
147 | { | |
148 | int i; | |
149 | ||
b16c2919 SL |
150 | spin_lock(&nf_conntrack_locks_all_lock); |
151 | nf_conntrack_locks_all = true; | |
152 | ||
b316ff78 PZ |
153 | /* |
154 | * Order the above store of 'nf_conntrack_locks_all' against | |
155 | * the spin_unlock_wait() loads below, such that if | |
156 | * nf_conntrack_lock() observes 'nf_conntrack_locks_all' | |
157 | * we must observe nf_conntrack_locks[] held: | |
158 | */ | |
159 | smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ | |
160 | ||
b16c2919 | 161 | for (i = 0; i < CONNTRACK_LOCKS; i++) { |
e39365be | 162 | spin_unlock_wait(&nf_conntrack_locks[i]); |
b16c2919 | 163 | } |
93bb0ceb JDB |
164 | } |
165 | ||
166 | static void nf_conntrack_all_unlock(void) | |
167 | { | |
b316ff78 PZ |
168 | /* |
169 | * All prior stores must be complete before we clear | |
170 | * 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock() | |
171 | * might observe the false value but not the entire | |
172 | * critical section: | |
173 | */ | |
174 | smp_store_release(&nf_conntrack_locks_all, false); | |
b16c2919 | 175 | spin_unlock(&nf_conntrack_locks_all_lock); |
93bb0ceb JDB |
176 | } |
177 | ||
e2b7606c | 178 | unsigned int nf_conntrack_htable_size __read_mostly; |
2567c4ea PNA |
179 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
180 | ||
e478075c | 181 | unsigned int nf_conntrack_max __read_mostly; |
92e47ba8 | 182 | seqcount_t nf_conntrack_generation __read_mostly; |
13b18339 | 183 | |
170a1fb9 SRV |
184 | /* nf_conn must be 8 bytes aligned, as the 3 LSB bits are used |
185 | * for the nfctinfo. We cheat by (ab)using the PER CPU cache line | |
186 | * alignment to enforce this. | |
187 | */ | |
188 | DEFINE_PER_CPU_ALIGNED(struct nf_conn, nf_conntrack_untracked); | |
b3c5163f | 189 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
13b18339 | 190 | |
141658fb | 191 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
9fb9cbb1 | 192 | |
1b8c8a9f FW |
193 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, |
194 | const struct net *net) | |
9fb9cbb1 | 195 | { |
0794935e | 196 | unsigned int n; |
1b8c8a9f | 197 | u32 seed; |
0794935e | 198 | |
141658fb FW |
199 | get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd)); |
200 | ||
0794935e PM |
201 | /* The direction must be ignored, so we hash everything up to the |
202 | * destination ports (which is a multiple of 4) and treat the last | |
203 | * three bytes manually. | |
204 | */ | |
1b8c8a9f | 205 | seed = nf_conntrack_hash_rnd ^ net_hash_mix(net); |
0794935e | 206 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
1b8c8a9f | 207 | return jhash2((u32 *)tuple, n, seed ^ |
99f07e91 CG |
208 | (((__force __u16)tuple->dst.u.all << 16) | |
209 | tuple->dst.protonum)); | |
210 | } | |
211 | ||
56d52d48 | 212 | static u32 scale_hash(u32 hash) |
99f07e91 | 213 | { |
56d52d48 | 214 | return reciprocal_scale(hash, nf_conntrack_htable_size); |
99f07e91 | 215 | } |
0794935e | 216 | |
1b8c8a9f FW |
217 | static u32 __hash_conntrack(const struct net *net, |
218 | const struct nf_conntrack_tuple *tuple, | |
219 | unsigned int size) | |
99f07e91 | 220 | { |
1b8c8a9f | 221 | return reciprocal_scale(hash_conntrack_raw(tuple, net), size); |
9fb9cbb1 YK |
222 | } |
223 | ||
1b8c8a9f FW |
224 | static u32 hash_conntrack(const struct net *net, |
225 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 226 | { |
56d52d48 | 227 | return scale_hash(hash_conntrack_raw(tuple, net)); |
9fb9cbb1 YK |
228 | } |
229 | ||
5f2b4c90 | 230 | bool |
9fb9cbb1 YK |
231 | nf_ct_get_tuple(const struct sk_buff *skb, |
232 | unsigned int nhoff, | |
233 | unsigned int dataoff, | |
234 | u_int16_t l3num, | |
235 | u_int8_t protonum, | |
a31f1adc | 236 | struct net *net, |
9fb9cbb1 YK |
237 | struct nf_conntrack_tuple *tuple, |
238 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 239 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 240 | { |
443a70d5 | 241 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
242 | |
243 | tuple->src.l3num = l3num; | |
244 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 245 | return false; |
9fb9cbb1 YK |
246 | |
247 | tuple->dst.protonum = protonum; | |
248 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
249 | ||
a31f1adc | 250 | return l4proto->pkt_to_tuple(skb, dataoff, net, tuple); |
9fb9cbb1 | 251 | } |
13b18339 | 252 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 253 | |
5f2b4c90 | 254 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
a31f1adc EB |
255 | u_int16_t l3num, |
256 | struct net *net, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
257 | { |
258 | struct nf_conntrack_l3proto *l3proto; | |
259 | struct nf_conntrack_l4proto *l4proto; | |
260 | unsigned int protoff; | |
261 | u_int8_t protonum; | |
262 | int ret; | |
263 | ||
264 | rcu_read_lock(); | |
265 | ||
266 | l3proto = __nf_ct_l3proto_find(l3num); | |
267 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
268 | if (ret != NF_ACCEPT) { | |
269 | rcu_read_unlock(); | |
5f2b4c90 | 270 | return false; |
e2a3123f YK |
271 | } |
272 | ||
273 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
274 | ||
a31f1adc | 275 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple, |
e2a3123f YK |
276 | l3proto, l4proto); |
277 | ||
278 | rcu_read_unlock(); | |
279 | return ret; | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
282 | ||
5f2b4c90 | 283 | bool |
9fb9cbb1 YK |
284 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
285 | const struct nf_conntrack_tuple *orig, | |
286 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 287 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 288 | { |
443a70d5 | 289 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
290 | |
291 | inverse->src.l3num = orig->src.l3num; | |
292 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 293 | return false; |
9fb9cbb1 YK |
294 | |
295 | inverse->dst.dir = !orig->dst.dir; | |
296 | ||
297 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 298 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 299 | } |
13b18339 | 300 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 301 | |
9fb9cbb1 YK |
302 | static void |
303 | clean_from_lists(struct nf_conn *ct) | |
304 | { | |
0d53778e | 305 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
306 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
307 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
308 | |
309 | /* Destroy all pending expectations */ | |
c1d10adb | 310 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
311 | } |
312 | ||
b7779d06 JDB |
313 | /* must be called with local_bh_disable */ |
314 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) | |
315 | { | |
316 | struct ct_pcpu *pcpu; | |
317 | ||
318 | /* add this conntrack to the (per cpu) dying list */ | |
319 | ct->cpu = smp_processor_id(); | |
320 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
321 | ||
322 | spin_lock(&pcpu->lock); | |
323 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
324 | &pcpu->dying); | |
325 | spin_unlock(&pcpu->lock); | |
326 | } | |
327 | ||
328 | /* must be called with local_bh_disable */ | |
329 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) | |
330 | { | |
331 | struct ct_pcpu *pcpu; | |
332 | ||
333 | /* add this conntrack to the (per cpu) unconfirmed list */ | |
334 | ct->cpu = smp_processor_id(); | |
335 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
336 | ||
337 | spin_lock(&pcpu->lock); | |
338 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
339 | &pcpu->unconfirmed); | |
340 | spin_unlock(&pcpu->lock); | |
341 | } | |
342 | ||
343 | /* must be called with local_bh_disable */ | |
344 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) | |
345 | { | |
346 | struct ct_pcpu *pcpu; | |
347 | ||
348 | /* We overload first tuple to link into unconfirmed or dying list.*/ | |
349 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
350 | ||
351 | spin_lock(&pcpu->lock); | |
352 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
353 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
354 | spin_unlock(&pcpu->lock); | |
355 | } | |
356 | ||
30322309 FW |
357 | #define NFCT_ALIGN(len) (((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK) |
358 | ||
0838aa7f | 359 | /* Released via destroy_conntrack() */ |
308ac914 DB |
360 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
361 | const struct nf_conntrack_zone *zone, | |
362 | gfp_t flags) | |
0838aa7f | 363 | { |
30322309 | 364 | struct nf_conn *tmpl, *p; |
0838aa7f | 365 | |
30322309 FW |
366 | if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) { |
367 | tmpl = kzalloc(sizeof(*tmpl) + NFCT_INFOMASK, flags); | |
368 | if (!tmpl) | |
369 | return NULL; | |
370 | ||
371 | p = tmpl; | |
372 | tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p); | |
373 | if (tmpl != p) { | |
374 | tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p); | |
375 | tmpl->proto.tmpl_padto = (char *)tmpl - (char *)p; | |
376 | } | |
377 | } else { | |
378 | tmpl = kzalloc(sizeof(*tmpl), flags); | |
379 | if (!tmpl) | |
380 | return NULL; | |
381 | } | |
0838aa7f PNA |
382 | |
383 | tmpl->status = IPS_TEMPLATE; | |
384 | write_pnet(&tmpl->ct_net, net); | |
6c8dee98 | 385 | nf_ct_zone_add(tmpl, zone); |
0838aa7f PNA |
386 | atomic_set(&tmpl->ct_general.use, 0); |
387 | ||
388 | return tmpl; | |
0838aa7f PNA |
389 | } |
390 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); | |
391 | ||
9cf94eab | 392 | void nf_ct_tmpl_free(struct nf_conn *tmpl) |
0838aa7f PNA |
393 | { |
394 | nf_ct_ext_destroy(tmpl); | |
395 | nf_ct_ext_free(tmpl); | |
30322309 FW |
396 | |
397 | if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) | |
398 | kfree((char *)tmpl - tmpl->proto.tmpl_padto); | |
399 | else | |
400 | kfree(tmpl); | |
0838aa7f | 401 | } |
9cf94eab | 402 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_free); |
0838aa7f | 403 | |
9fb9cbb1 YK |
404 | static void |
405 | destroy_conntrack(struct nf_conntrack *nfct) | |
406 | { | |
407 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
605dcad6 | 408 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 409 | |
0d53778e | 410 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 | 411 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
9fb9cbb1 | 412 | |
0838aa7f PNA |
413 | if (unlikely(nf_ct_is_template(ct))) { |
414 | nf_ct_tmpl_free(ct); | |
415 | return; | |
416 | } | |
923f4902 | 417 | rcu_read_lock(); |
5e8fbe2a | 418 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
4b4ceb9d | 419 | if (l4proto->destroy) |
605dcad6 | 420 | l4proto->destroy(ct); |
9fb9cbb1 | 421 | |
982d9a9c | 422 | rcu_read_unlock(); |
9fb9cbb1 | 423 | |
ca7433df | 424 | local_bh_disable(); |
9fb9cbb1 YK |
425 | /* Expectations will have been removed in clean_from_lists, |
426 | * except TFTP can create an expectation on the first packet, | |
427 | * before connection is in the list, so we need to clean here, | |
ca7433df JDB |
428 | * too. |
429 | */ | |
c1d10adb | 430 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 431 | |
b7779d06 | 432 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
9fb9cbb1 | 433 | |
ca7433df | 434 | local_bh_enable(); |
9fb9cbb1 YK |
435 | |
436 | if (ct->master) | |
437 | nf_ct_put(ct->master); | |
438 | ||
0d53778e | 439 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
440 | nf_conntrack_free(ct); |
441 | } | |
442 | ||
02982c27 | 443 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 444 | { |
0d55af87 | 445 | struct net *net = nf_ct_net(ct); |
93bb0ceb | 446 | unsigned int hash, reply_hash; |
93bb0ceb | 447 | unsigned int sequence; |
9fb9cbb1 | 448 | |
9858a3ae | 449 | nf_ct_helper_destroy(ct); |
93bb0ceb JDB |
450 | |
451 | local_bh_disable(); | |
452 | do { | |
a3efd812 | 453 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 454 | hash = hash_conntrack(net, |
93bb0ceb | 455 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 456 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
457 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
458 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
459 | ||
9fb9cbb1 | 460 | clean_from_lists(ct); |
93bb0ceb JDB |
461 | nf_conntrack_double_unlock(hash, reply_hash); |
462 | ||
b7779d06 | 463 | nf_ct_add_to_dying_list(ct); |
93bb0ceb | 464 | |
93bb0ceb | 465 | local_bh_enable(); |
dd7669a9 | 466 | } |
dd7669a9 | 467 | |
02982c27 | 468 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 469 | { |
a992ca2a PNA |
470 | struct nf_conn_tstamp *tstamp; |
471 | ||
f330a7fd FW |
472 | if (test_and_set_bit(IPS_DYING_BIT, &ct->status)) |
473 | return false; | |
474 | ||
a992ca2a PNA |
475 | tstamp = nf_conn_tstamp_find(ct); |
476 | if (tstamp && tstamp->stop == 0) | |
d2de875c | 477 | tstamp->stop = ktime_get_real_ns(); |
dd7669a9 | 478 | |
9500507c FW |
479 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
480 | portid, report) < 0) { | |
f330a7fd FW |
481 | /* destroy event was not delivered. nf_ct_put will |
482 | * be done by event cache worker on redelivery. | |
483 | */ | |
dd7669a9 | 484 | nf_ct_delete_from_lists(ct); |
9500507c | 485 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
02982c27 | 486 | return false; |
dd7669a9 | 487 | } |
9500507c FW |
488 | |
489 | nf_conntrack_ecache_work(nf_ct_net(ct)); | |
dd7669a9 | 490 | nf_ct_delete_from_lists(ct); |
9fb9cbb1 | 491 | nf_ct_put(ct); |
02982c27 FW |
492 | return true; |
493 | } | |
494 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
495 | ||
c6825c09 AV |
496 | static inline bool |
497 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, | |
308ac914 | 498 | const struct nf_conntrack_tuple *tuple, |
e0c7d472 FW |
499 | const struct nf_conntrack_zone *zone, |
500 | const struct net *net) | |
c6825c09 AV |
501 | { |
502 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
503 | ||
504 | /* A conntrack can be recreated with the equal tuple, | |
505 | * so we need to check that the conntrack is confirmed | |
506 | */ | |
507 | return nf_ct_tuple_equal(tuple, &h->tuple) && | |
deedb590 | 508 | nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) && |
e0c7d472 FW |
509 | nf_ct_is_confirmed(ct) && |
510 | net_eq(net, nf_ct_net(ct)); | |
c6825c09 AV |
511 | } |
512 | ||
f330a7fd FW |
513 | /* caller must hold rcu readlock and none of the nf_conntrack_locks */ |
514 | static void nf_ct_gc_expired(struct nf_conn *ct) | |
515 | { | |
516 | if (!atomic_inc_not_zero(&ct->ct_general.use)) | |
517 | return; | |
518 | ||
519 | if (nf_ct_should_gc(ct)) | |
520 | nf_ct_kill(ct); | |
521 | ||
522 | nf_ct_put(ct); | |
523 | } | |
524 | ||
ea781f19 ED |
525 | /* |
526 | * Warning : | |
527 | * - Caller must take a reference on returned object | |
528 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
ea781f19 | 529 | */ |
99f07e91 | 530 | static struct nf_conntrack_tuple_hash * |
308ac914 | 531 | ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 532 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
533 | { |
534 | struct nf_conntrack_tuple_hash *h; | |
5e3c61f9 | 535 | struct hlist_nulls_head *ct_hash; |
ea781f19 | 536 | struct hlist_nulls_node *n; |
92e47ba8 | 537 | unsigned int bucket, hsize; |
9fb9cbb1 | 538 | |
ea781f19 | 539 | begin: |
92e47ba8 LZ |
540 | nf_conntrack_get_ht(&ct_hash, &hsize); |
541 | bucket = reciprocal_scale(hash, hsize); | |
5e3c61f9 FW |
542 | |
543 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) { | |
f330a7fd FW |
544 | struct nf_conn *ct; |
545 | ||
546 | ct = nf_ct_tuplehash_to_ctrack(h); | |
547 | if (nf_ct_is_expired(ct)) { | |
548 | nf_ct_gc_expired(ct); | |
549 | continue; | |
550 | } | |
551 | ||
552 | if (nf_ct_is_dying(ct)) | |
553 | continue; | |
554 | ||
8e8118f8 | 555 | if (nf_ct_key_equal(h, tuple, zone, net)) |
9fb9cbb1 | 556 | return h; |
9fb9cbb1 | 557 | } |
ea781f19 ED |
558 | /* |
559 | * if the nulls value we got at the end of this lookup is | |
560 | * not the expected one, we must restart lookup. | |
561 | * We probably met an item that was moved to another chain. | |
562 | */ | |
99f07e91 | 563 | if (get_nulls_value(n) != bucket) { |
2cf12348 | 564 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
ea781f19 | 565 | goto begin; |
af740b2c | 566 | } |
9fb9cbb1 YK |
567 | |
568 | return NULL; | |
569 | } | |
99f07e91 | 570 | |
9fb9cbb1 | 571 | /* Find a connection corresponding to a tuple. */ |
99f07e91 | 572 | static struct nf_conntrack_tuple_hash * |
308ac914 | 573 | __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 574 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
575 | { |
576 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 577 | struct nf_conn *ct; |
9fb9cbb1 | 578 | |
76507f69 | 579 | rcu_read_lock(); |
ea781f19 | 580 | begin: |
99f07e91 | 581 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
582 | if (h) { |
583 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
584 | if (unlikely(nf_ct_is_dying(ct) || |
585 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 586 | h = NULL; |
ea781f19 | 587 | else { |
e0c7d472 | 588 | if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) { |
ea781f19 ED |
589 | nf_ct_put(ct); |
590 | goto begin; | |
591 | } | |
592 | } | |
76507f69 PM |
593 | } |
594 | rcu_read_unlock(); | |
9fb9cbb1 YK |
595 | |
596 | return h; | |
597 | } | |
99f07e91 CG |
598 | |
599 | struct nf_conntrack_tuple_hash * | |
308ac914 | 600 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 CG |
601 | const struct nf_conntrack_tuple *tuple) |
602 | { | |
603 | return __nf_conntrack_find_get(net, zone, tuple, | |
1b8c8a9f | 604 | hash_conntrack_raw(tuple, net)); |
99f07e91 | 605 | } |
13b18339 | 606 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 607 | |
c1d10adb PNA |
608 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
609 | unsigned int hash, | |
b476b72a | 610 | unsigned int reply_hash) |
c1d10adb | 611 | { |
ea781f19 | 612 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
56d52d48 | 613 | &nf_conntrack_hash[hash]); |
ea781f19 | 614 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
56d52d48 | 615 | &nf_conntrack_hash[reply_hash]); |
c1d10adb PNA |
616 | } |
617 | ||
7d367e06 JK |
618 | int |
619 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 620 | { |
308ac914 | 621 | const struct nf_conntrack_zone *zone; |
d696c7bd | 622 | struct net *net = nf_ct_net(ct); |
b476b72a | 623 | unsigned int hash, reply_hash; |
7d367e06 JK |
624 | struct nf_conntrack_tuple_hash *h; |
625 | struct hlist_nulls_node *n; | |
93bb0ceb | 626 | unsigned int sequence; |
c1d10adb | 627 | |
5d0aa2cc | 628 | zone = nf_ct_zone(ct); |
7d367e06 | 629 | |
93bb0ceb JDB |
630 | local_bh_disable(); |
631 | do { | |
a3efd812 | 632 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 633 | hash = hash_conntrack(net, |
93bb0ceb | 634 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 635 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
636 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
637 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
7d367e06 JK |
638 | |
639 | /* See if there's one in the list already, including reverse */ | |
56d52d48 | 640 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 641 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 642 | zone, net)) |
7d367e06 | 643 | goto out; |
86804348 | 644 | |
56d52d48 | 645 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 646 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 647 | zone, net)) |
7d367e06 | 648 | goto out; |
c1d10adb | 649 | |
e53376be PNA |
650 | smp_wmb(); |
651 | /* The caller holds a reference to this object */ | |
652 | atomic_set(&ct->ct_general.use, 2); | |
b476b72a | 653 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 654 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 655 | NF_CT_STAT_INC(net, insert); |
93bb0ceb | 656 | local_bh_enable(); |
7d367e06 JK |
657 | return 0; |
658 | ||
659 | out: | |
93bb0ceb | 660 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 661 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 662 | local_bh_enable(); |
7d367e06 | 663 | return -EEXIST; |
c1d10adb | 664 | } |
7d367e06 | 665 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 666 | |
ba76738c PNA |
667 | static inline void nf_ct_acct_update(struct nf_conn *ct, |
668 | enum ip_conntrack_info ctinfo, | |
669 | unsigned int len) | |
670 | { | |
671 | struct nf_conn_acct *acct; | |
672 | ||
673 | acct = nf_conn_acct_find(ct); | |
674 | if (acct) { | |
675 | struct nf_conn_counter *counter = acct->counter; | |
676 | ||
677 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); | |
678 | atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes); | |
679 | } | |
680 | } | |
681 | ||
71d8c47f PNA |
682 | static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
683 | const struct nf_conn *loser_ct) | |
684 | { | |
685 | struct nf_conn_acct *acct; | |
686 | ||
687 | acct = nf_conn_acct_find(loser_ct); | |
688 | if (acct) { | |
689 | struct nf_conn_counter *counter = acct->counter; | |
71d8c47f PNA |
690 | unsigned int bytes; |
691 | ||
692 | /* u32 should be fine since we must have seen one packet. */ | |
693 | bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes); | |
694 | nf_ct_acct_update(ct, ctinfo, bytes); | |
695 | } | |
696 | } | |
697 | ||
698 | /* Resolve race on insertion if this protocol allows this. */ | |
699 | static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb, | |
700 | enum ip_conntrack_info ctinfo, | |
701 | struct nf_conntrack_tuple_hash *h) | |
702 | { | |
703 | /* This is the conntrack entry already in hashes that won race. */ | |
704 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
705 | struct nf_conntrack_l4proto *l4proto; | |
706 | ||
707 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); | |
708 | if (l4proto->allow_clash && | |
6e699867 | 709 | ((ct->status & IPS_NAT_DONE_MASK) == 0) && |
71d8c47f PNA |
710 | !nf_ct_is_dying(ct) && |
711 | atomic_inc_not_zero(&ct->ct_general.use)) { | |
97a6ad13 FW |
712 | enum ip_conntrack_info oldinfo; |
713 | struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo); | |
714 | ||
715 | nf_ct_acct_merge(ct, ctinfo, loser_ct); | |
716 | nf_conntrack_put(&loser_ct->ct_general); | |
c74454fa | 717 | nf_ct_set(skb, ct, oldinfo); |
71d8c47f PNA |
718 | return NF_ACCEPT; |
719 | } | |
720 | NF_CT_STAT_INC(net, drop); | |
721 | return NF_DROP; | |
722 | } | |
723 | ||
9fb9cbb1 YK |
724 | /* Confirm a connection given skb; places it in hash table */ |
725 | int | |
3db05fea | 726 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 | 727 | { |
308ac914 | 728 | const struct nf_conntrack_zone *zone; |
b476b72a | 729 | unsigned int hash, reply_hash; |
df0933dc | 730 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 731 | struct nf_conn *ct; |
df0933dc | 732 | struct nf_conn_help *help; |
a992ca2a | 733 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 734 | struct hlist_nulls_node *n; |
9fb9cbb1 | 735 | enum ip_conntrack_info ctinfo; |
400dad39 | 736 | struct net *net; |
93bb0ceb | 737 | unsigned int sequence; |
71d8c47f | 738 | int ret = NF_DROP; |
9fb9cbb1 | 739 | |
3db05fea | 740 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 741 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
742 | |
743 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
744 | ICMP/TCP RST packets in other direction. Actual packet | |
745 | which created connection will be IP_CT_NEW or for an | |
746 | expected connection, IP_CT_RELATED. */ | |
747 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
748 | return NF_ACCEPT; | |
749 | ||
5d0aa2cc | 750 | zone = nf_ct_zone(ct); |
93bb0ceb JDB |
751 | local_bh_disable(); |
752 | ||
753 | do { | |
a3efd812 | 754 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb JDB |
755 | /* reuse the hash saved before */ |
756 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
56d52d48 | 757 | hash = scale_hash(hash); |
deedb590 | 758 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
759 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
760 | ||
761 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
9fb9cbb1 YK |
762 | |
763 | /* We're not in hash table, and we refuse to set up related | |
93bb0ceb JDB |
764 | * connections for unconfirmed conns. But packet copies and |
765 | * REJECT will give spurious warnings here. | |
766 | */ | |
9fb9cbb1 YK |
767 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
768 | ||
25985edc | 769 | /* No external references means no one else could have |
93bb0ceb JDB |
770 | * confirmed us. |
771 | */ | |
9fb9cbb1 | 772 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
0d53778e | 773 | pr_debug("Confirming conntrack %p\n", ct); |
8ca3f5e9 PNA |
774 | /* We have to check the DYING flag after unlink to prevent |
775 | * a race against nf_ct_get_next_corpse() possibly called from | |
776 | * user context, else we insert an already 'dead' hash, blocking | |
777 | * further use of that particular connection -JM. | |
778 | */ | |
779 | nf_ct_del_from_dying_or_unconfirmed_list(ct); | |
780 | ||
71d8c47f PNA |
781 | if (unlikely(nf_ct_is_dying(ct))) { |
782 | nf_ct_add_to_dying_list(ct); | |
783 | goto dying; | |
784 | } | |
fc350777 | 785 | |
9fb9cbb1 YK |
786 | /* See if there's one in the list already, including reverse: |
787 | NAT could have grabbed it without realizing, since we're | |
788 | not in the hash. If there is, we lost race. */ | |
56d52d48 | 789 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 790 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 791 | zone, net)) |
df0933dc | 792 | goto out; |
86804348 | 793 | |
56d52d48 | 794 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 795 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 796 | zone, net)) |
df0933dc | 797 | goto out; |
9fb9cbb1 | 798 | |
df0933dc PM |
799 | /* Timer relative to confirmation time, not original |
800 | setting time, otherwise we'd get timer wrap in | |
801 | weird delay cases. */ | |
f330a7fd | 802 | ct->timeout += nfct_time_stamp; |
df0933dc | 803 | atomic_inc(&ct->ct_general.use); |
45eec341 | 804 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 805 | |
a992ca2a PNA |
806 | /* set conntrack timestamp, if enabled. */ |
807 | tstamp = nf_conn_tstamp_find(ct); | |
808 | if (tstamp) { | |
2456e855 | 809 | if (skb->tstamp == 0) |
e3192690 | 810 | __net_timestamp(skb); |
a992ca2a PNA |
811 | |
812 | tstamp->start = ktime_to_ns(skb->tstamp); | |
813 | } | |
5c8ec910 PM |
814 | /* Since the lookup is lockless, hash insertion must be done after |
815 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
816 | * guarantee that no other CPU can find the conntrack before the above | |
817 | * stores are visible. | |
818 | */ | |
b476b72a | 819 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 820 | nf_conntrack_double_unlock(hash, reply_hash); |
93bb0ceb | 821 | local_bh_enable(); |
5c8ec910 | 822 | |
df0933dc PM |
823 | help = nfct_help(ct); |
824 | if (help && help->helper) | |
a71996fc | 825 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 826 | |
df0933dc | 827 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 828 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 829 | return NF_ACCEPT; |
9fb9cbb1 | 830 | |
df0933dc | 831 | out: |
8ca3f5e9 | 832 | nf_ct_add_to_dying_list(ct); |
71d8c47f PNA |
833 | ret = nf_ct_resolve_clash(net, skb, ctinfo, h); |
834 | dying: | |
93bb0ceb | 835 | nf_conntrack_double_unlock(hash, reply_hash); |
0d55af87 | 836 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 837 | local_bh_enable(); |
71d8c47f | 838 | return ret; |
9fb9cbb1 | 839 | } |
13b18339 | 840 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
841 | |
842 | /* Returns true if a connection correspondings to the tuple (required | |
843 | for NAT). */ | |
844 | int | |
845 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
846 | const struct nf_conn *ignored_conntrack) | |
847 | { | |
400dad39 | 848 | struct net *net = nf_ct_net(ignored_conntrack); |
308ac914 | 849 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 | 850 | struct nf_conntrack_tuple_hash *h; |
5e3c61f9 | 851 | struct hlist_nulls_head *ct_hash; |
92e47ba8 | 852 | unsigned int hash, hsize; |
ea781f19 | 853 | struct hlist_nulls_node *n; |
5d0aa2cc | 854 | struct nf_conn *ct; |
308ac914 DB |
855 | |
856 | zone = nf_ct_zone(ignored_conntrack); | |
9fb9cbb1 | 857 | |
2cf12348 | 858 | rcu_read_lock(); |
95a8d19f | 859 | begin: |
92e47ba8 LZ |
860 | nf_conntrack_get_ht(&ct_hash, &hsize); |
861 | hash = __hash_conntrack(net, tuple, hsize); | |
5e3c61f9 FW |
862 | |
863 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) { | |
5d0aa2cc | 864 | ct = nf_ct_tuplehash_to_ctrack(h); |
f330a7fd FW |
865 | |
866 | if (ct == ignored_conntrack) | |
867 | continue; | |
868 | ||
869 | if (nf_ct_is_expired(ct)) { | |
870 | nf_ct_gc_expired(ct); | |
871 | continue; | |
872 | } | |
873 | ||
874 | if (nf_ct_key_equal(h, tuple, zone, net)) { | |
2cf12348 FW |
875 | NF_CT_STAT_INC_ATOMIC(net, found); |
876 | rcu_read_unlock(); | |
ba419aff PM |
877 | return 1; |
878 | } | |
ba419aff | 879 | } |
95a8d19f FW |
880 | |
881 | if (get_nulls_value(n) != hash) { | |
882 | NF_CT_STAT_INC_ATOMIC(net, search_restart); | |
883 | goto begin; | |
884 | } | |
885 | ||
2cf12348 | 886 | rcu_read_unlock(); |
9fb9cbb1 | 887 | |
ba419aff | 888 | return 0; |
9fb9cbb1 | 889 | } |
13b18339 | 890 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 891 | |
7ae7730f PM |
892 | #define NF_CT_EVICTION_RANGE 8 |
893 | ||
9fb9cbb1 YK |
894 | /* There's a small race here where we may free a just-assured |
895 | connection. Too bad: we're in trouble anyway. */ | |
242922a0 FW |
896 | static unsigned int early_drop_list(struct net *net, |
897 | struct hlist_nulls_head *head) | |
9fb9cbb1 | 898 | { |
9fb9cbb1 | 899 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 900 | struct hlist_nulls_node *n; |
242922a0 FW |
901 | unsigned int drops = 0; |
902 | struct nf_conn *tmp; | |
3e86638e | 903 | |
242922a0 FW |
904 | hlist_nulls_for_each_entry_rcu(h, n, head, hnnode) { |
905 | tmp = nf_ct_tuplehash_to_ctrack(h); | |
9fb9cbb1 | 906 | |
f330a7fd FW |
907 | if (nf_ct_is_expired(tmp)) { |
908 | nf_ct_gc_expired(tmp); | |
909 | continue; | |
910 | } | |
911 | ||
242922a0 FW |
912 | if (test_bit(IPS_ASSURED_BIT, &tmp->status) || |
913 | !net_eq(nf_ct_net(tmp), net) || | |
914 | nf_ct_is_dying(tmp)) | |
915 | continue; | |
76507f69 | 916 | |
242922a0 FW |
917 | if (!atomic_inc_not_zero(&tmp->ct_general.use)) |
918 | continue; | |
76507f69 | 919 | |
242922a0 FW |
920 | /* kill only if still in same netns -- might have moved due to |
921 | * SLAB_DESTROY_BY_RCU rules. | |
922 | * | |
923 | * We steal the timer reference. If that fails timer has | |
924 | * already fired or someone else deleted it. Just drop ref | |
925 | * and move to next entry. | |
926 | */ | |
927 | if (net_eq(nf_ct_net(tmp), net) && | |
928 | nf_ct_is_confirmed(tmp) && | |
242922a0 FW |
929 | nf_ct_delete(tmp, 0, 0)) |
930 | drops++; | |
931 | ||
932 | nf_ct_put(tmp); | |
9fb9cbb1 | 933 | } |
3e86638e | 934 | |
242922a0 FW |
935 | return drops; |
936 | } | |
9fb9cbb1 | 937 | |
242922a0 FW |
938 | static noinline int early_drop(struct net *net, unsigned int _hash) |
939 | { | |
940 | unsigned int i; | |
9fb9cbb1 | 941 | |
242922a0 FW |
942 | for (i = 0; i < NF_CT_EVICTION_RANGE; i++) { |
943 | struct hlist_nulls_head *ct_hash; | |
92e47ba8 | 944 | unsigned int hash, hsize, drops; |
242922a0 | 945 | |
3101e0fc | 946 | rcu_read_lock(); |
92e47ba8 LZ |
947 | nf_conntrack_get_ht(&ct_hash, &hsize); |
948 | hash = reciprocal_scale(_hash++, hsize); | |
242922a0 FW |
949 | |
950 | drops = early_drop_list(net, &ct_hash[hash]); | |
3101e0fc LZ |
951 | rcu_read_unlock(); |
952 | ||
242922a0 FW |
953 | if (drops) { |
954 | NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); | |
955 | return true; | |
74138511 | 956 | } |
9fb9cbb1 | 957 | } |
3e86638e | 958 | |
242922a0 | 959 | return false; |
9fb9cbb1 YK |
960 | } |
961 | ||
b87a2f91 FW |
962 | static void gc_worker(struct work_struct *work) |
963 | { | |
e5072053 | 964 | unsigned int min_interval = max(HZ / GC_MAX_BUCKETS_DIV, 1u); |
b87a2f91 | 965 | unsigned int i, goal, buckets = 0, expired_count = 0; |
b87a2f91 | 966 | struct conntrack_gc_work *gc_work; |
e0df8cae FW |
967 | unsigned int ratio, scanned = 0; |
968 | unsigned long next_run; | |
b87a2f91 FW |
969 | |
970 | gc_work = container_of(work, struct conntrack_gc_work, dwork.work); | |
971 | ||
e0df8cae | 972 | goal = nf_conntrack_htable_size / GC_MAX_BUCKETS_DIV; |
b87a2f91 FW |
973 | i = gc_work->last_bucket; |
974 | ||
975 | do { | |
976 | struct nf_conntrack_tuple_hash *h; | |
977 | struct hlist_nulls_head *ct_hash; | |
978 | struct hlist_nulls_node *n; | |
979 | unsigned int hashsz; | |
980 | struct nf_conn *tmp; | |
981 | ||
982 | i++; | |
983 | rcu_read_lock(); | |
984 | ||
985 | nf_conntrack_get_ht(&ct_hash, &hashsz); | |
986 | if (i >= hashsz) | |
987 | i = 0; | |
988 | ||
989 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { | |
990 | tmp = nf_ct_tuplehash_to_ctrack(h); | |
991 | ||
c023c0e4 | 992 | scanned++; |
b87a2f91 FW |
993 | if (nf_ct_is_expired(tmp)) { |
994 | nf_ct_gc_expired(tmp); | |
995 | expired_count++; | |
996 | continue; | |
997 | } | |
998 | } | |
999 | ||
1000 | /* could check get_nulls_value() here and restart if ct | |
1001 | * was moved to another chain. But given gc is best-effort | |
1002 | * we will just continue with next hash slot. | |
1003 | */ | |
1004 | rcu_read_unlock(); | |
1005 | cond_resched_rcu_qs(); | |
524b698d | 1006 | } while (++buckets < goal); |
b87a2f91 FW |
1007 | |
1008 | if (gc_work->exiting) | |
1009 | return; | |
1010 | ||
e0df8cae FW |
1011 | /* |
1012 | * Eviction will normally happen from the packet path, and not | |
1013 | * from this gc worker. | |
1014 | * | |
1015 | * This worker is only here to reap expired entries when system went | |
1016 | * idle after a busy period. | |
1017 | * | |
1018 | * The heuristics below are supposed to balance conflicting goals: | |
1019 | * | |
1020 | * 1. Minimize time until we notice a stale entry | |
1021 | * 2. Maximize scan intervals to not waste cycles | |
1022 | * | |
e5072053 | 1023 | * Normally, expire ratio will be close to 0. |
e0df8cae | 1024 | * |
e5072053 FW |
1025 | * As soon as a sizeable fraction of the entries have expired |
1026 | * increase scan frequency. | |
e0df8cae | 1027 | */ |
c023c0e4 | 1028 | ratio = scanned ? expired_count * 100 / scanned : 0; |
e5072053 FW |
1029 | if (ratio > GC_EVICT_RATIO) { |
1030 | gc_work->next_gc_run = min_interval; | |
e0df8cae | 1031 | } else { |
e5072053 | 1032 | unsigned int max = GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV; |
e0df8cae | 1033 | |
e5072053 FW |
1034 | BUILD_BUG_ON((GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV) == 0); |
1035 | ||
1036 | gc_work->next_gc_run += min_interval; | |
1037 | if (gc_work->next_gc_run > max) | |
1038 | gc_work->next_gc_run = max; | |
e0df8cae | 1039 | } |
c023c0e4 | 1040 | |
e5072053 | 1041 | next_run = gc_work->next_gc_run; |
b87a2f91 | 1042 | gc_work->last_bucket = i; |
e0df8cae | 1043 | queue_delayed_work(system_long_wq, &gc_work->dwork, next_run); |
b87a2f91 FW |
1044 | } |
1045 | ||
1046 | static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work) | |
1047 | { | |
1048 | INIT_DELAYED_WORK(&gc_work->dwork, gc_worker); | |
e5072053 | 1049 | gc_work->next_gc_run = HZ; |
b87a2f91 FW |
1050 | gc_work->exiting = false; |
1051 | } | |
1052 | ||
99f07e91 | 1053 | static struct nf_conn * |
308ac914 DB |
1054 | __nf_conntrack_alloc(struct net *net, |
1055 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1056 | const struct nf_conntrack_tuple *orig, |
1057 | const struct nf_conntrack_tuple *repl, | |
1058 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 1059 | { |
cd7fcbf1 | 1060 | struct nf_conn *ct; |
9fb9cbb1 | 1061 | |
5251e2d2 | 1062 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 1063 | atomic_inc(&net->ct.count); |
5251e2d2 | 1064 | |
76eb9460 | 1065 | if (nf_conntrack_max && |
49ac8713 | 1066 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
93bb0ceb | 1067 | if (!early_drop(net, hash)) { |
49ac8713 | 1068 | atomic_dec(&net->ct.count); |
e87cc472 | 1069 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
1070 | return ERR_PTR(-ENOMEM); |
1071 | } | |
1072 | } | |
1073 | ||
941297f4 ED |
1074 | /* |
1075 | * Do not use kmem_cache_zalloc(), as this cache uses | |
1076 | * SLAB_DESTROY_BY_RCU. | |
1077 | */ | |
0c5366b3 | 1078 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); |
5e8018fc DB |
1079 | if (ct == NULL) |
1080 | goto out; | |
1081 | ||
440f0d58 | 1082 | spin_lock_init(&ct->lock); |
c88130bc | 1083 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 1084 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 1085 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
1086 | /* save hash for reusing when confirming */ |
1087 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
c41884ce | 1088 | ct->status = 0; |
c2d9ba9b | 1089 | write_pnet(&ct->ct_net, net); |
c41884ce FW |
1090 | memset(&ct->__nfct_init_offset[0], 0, |
1091 | offsetof(struct nf_conn, proto) - | |
1092 | offsetof(struct nf_conn, __nfct_init_offset[0])); | |
5e8018fc | 1093 | |
6c8dee98 | 1094 | nf_ct_zone_add(ct, zone); |
5e8018fc | 1095 | |
e53376be PNA |
1096 | /* Because we use RCU lookups, we set ct_general.use to zero before |
1097 | * this is inserted in any list. | |
941297f4 | 1098 | */ |
e53376be | 1099 | atomic_set(&ct->ct_general.use, 0); |
c88130bc | 1100 | return ct; |
5e8018fc DB |
1101 | out: |
1102 | atomic_dec(&net->ct.count); | |
5d0aa2cc | 1103 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 1104 | } |
99f07e91 | 1105 | |
308ac914 DB |
1106 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
1107 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1108 | const struct nf_conntrack_tuple *orig, |
1109 | const struct nf_conntrack_tuple *repl, | |
1110 | gfp_t gfp) | |
1111 | { | |
1112 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
1113 | } | |
13b18339 | 1114 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 1115 | |
c88130bc | 1116 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 1117 | { |
1d45209d ED |
1118 | struct net *net = nf_ct_net(ct); |
1119 | ||
e53376be PNA |
1120 | /* A freed object has refcnt == 0, that's |
1121 | * the golden rule for SLAB_DESTROY_BY_RCU | |
1122 | */ | |
1123 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); | |
1124 | ||
ceeff754 | 1125 | nf_ct_ext_destroy(ct); |
ea781f19 | 1126 | nf_ct_ext_free(ct); |
0c5366b3 | 1127 | kmem_cache_free(nf_conntrack_cachep, ct); |
4e857c58 | 1128 | smp_mb__before_atomic(); |
0c3c6c00 | 1129 | atomic_dec(&net->ct.count); |
76507f69 | 1130 | } |
13b18339 | 1131 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 1132 | |
c539f017 | 1133 | |
9fb9cbb1 YK |
1134 | /* Allocate a new conntrack: we return -ENOMEM if classification |
1135 | failed due to stress. Otherwise it really is unclassifiable. */ | |
fc09e4a7 | 1136 | static noinline struct nf_conntrack_tuple_hash * |
b2a15a60 | 1137 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 1138 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 1139 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 1140 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 1141 | struct sk_buff *skb, |
60b5f8f7 | 1142 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 1143 | { |
c88130bc | 1144 | struct nf_conn *ct; |
3c158f7f | 1145 | struct nf_conn_help *help; |
9fb9cbb1 | 1146 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 1147 | struct nf_conntrack_ecache *ecache; |
ca7433df | 1148 | struct nf_conntrack_expect *exp = NULL; |
308ac914 | 1149 | const struct nf_conntrack_zone *zone; |
60b5f8f7 | 1150 | struct nf_conn_timeout *timeout_ext; |
5e8018fc | 1151 | struct nf_conntrack_zone tmp; |
60b5f8f7 | 1152 | unsigned int *timeouts; |
9fb9cbb1 | 1153 | |
605dcad6 | 1154 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 1155 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
1156 | return NULL; |
1157 | } | |
1158 | ||
5e8018fc | 1159 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
99f07e91 CG |
1160 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
1161 | hash); | |
0a9ee813 | 1162 | if (IS_ERR(ct)) |
c88130bc | 1163 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 1164 | |
4440a2ab GF |
1165 | if (!nf_ct_add_synproxy(ct, tmpl)) { |
1166 | nf_conntrack_free(ct); | |
1167 | return ERR_PTR(-ENOMEM); | |
48b1de4c PM |
1168 | } |
1169 | ||
60b5f8f7 | 1170 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
ae2d708e PNA |
1171 | if (timeout_ext) { |
1172 | timeouts = nf_ct_timeout_data(timeout_ext); | |
1173 | if (unlikely(!timeouts)) | |
1174 | timeouts = l4proto->get_timeouts(net); | |
1175 | } else { | |
60b5f8f7 | 1176 | timeouts = l4proto->get_timeouts(net); |
ae2d708e | 1177 | } |
60b5f8f7 | 1178 | |
2c8503f5 | 1179 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 1180 | nf_conntrack_free(ct); |
ccd63c20 | 1181 | pr_debug("can't track with proto module\n"); |
9fb9cbb1 YK |
1182 | return NULL; |
1183 | } | |
1184 | ||
60b5f8f7 | 1185 | if (timeout_ext) |
ae2d708e PNA |
1186 | nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout), |
1187 | GFP_ATOMIC); | |
60b5f8f7 | 1188 | |
58401572 | 1189 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 1190 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 1191 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
1192 | |
1193 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
1194 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
1195 | ecache ? ecache->expmask : 0, | |
1196 | GFP_ATOMIC); | |
58401572 | 1197 | |
ca7433df JDB |
1198 | local_bh_disable(); |
1199 | if (net->ct.expect_count) { | |
1200 | spin_lock(&nf_conntrack_expect_lock); | |
1201 | exp = nf_ct_find_expectation(net, zone, tuple); | |
1202 | if (exp) { | |
ccd63c20 | 1203 | pr_debug("expectation arrives ct=%p exp=%p\n", |
ca7433df JDB |
1204 | ct, exp); |
1205 | /* Welcome, Mr. Bond. We've been expecting you... */ | |
1206 | __set_bit(IPS_EXPECTED_BIT, &ct->status); | |
1207 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ | |
1208 | ct->master = exp->master; | |
1209 | if (exp->helper) { | |
1210 | help = nf_ct_helper_ext_add(ct, exp->helper, | |
1211 | GFP_ATOMIC); | |
1212 | if (help) | |
1213 | rcu_assign_pointer(help->helper, exp->helper); | |
1214 | } | |
ceceae1b | 1215 | |
9fb9cbb1 | 1216 | #ifdef CONFIG_NF_CONNTRACK_MARK |
ca7433df | 1217 | ct->mark = exp->master->mark; |
7c9728c3 JM |
1218 | #endif |
1219 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
ca7433df | 1220 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 1221 | #endif |
ca7433df JDB |
1222 | NF_CT_STAT_INC(net, expect_new); |
1223 | } | |
1224 | spin_unlock(&nf_conntrack_expect_lock); | |
1225 | } | |
8e8118f8 | 1226 | if (!exp) |
b2a15a60 | 1227 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
9fb9cbb1 | 1228 | |
e53376be PNA |
1229 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
1230 | nf_conntrack_get(&ct->ct_general); | |
b7779d06 | 1231 | nf_ct_add_to_unconfirmed_list(ct); |
9fb9cbb1 | 1232 | |
ca7433df | 1233 | local_bh_enable(); |
9fb9cbb1 YK |
1234 | |
1235 | if (exp) { | |
1236 | if (exp->expectfn) | |
c88130bc | 1237 | exp->expectfn(ct, exp); |
6823645d | 1238 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
1239 | } |
1240 | ||
c88130bc | 1241 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
1242 | } |
1243 | ||
fc09e4a7 FW |
1244 | /* On success, returns 0, sets skb->_nfct | ctinfo */ |
1245 | static int | |
b2a15a60 | 1246 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 1247 | struct sk_buff *skb, |
9fb9cbb1 YK |
1248 | unsigned int dataoff, |
1249 | u_int16_t l3num, | |
1250 | u_int8_t protonum, | |
1251 | struct nf_conntrack_l3proto *l3proto, | |
fc09e4a7 | 1252 | struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 1253 | { |
308ac914 | 1254 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 YK |
1255 | struct nf_conntrack_tuple tuple; |
1256 | struct nf_conntrack_tuple_hash *h; | |
fc09e4a7 | 1257 | enum ip_conntrack_info ctinfo; |
5e8018fc | 1258 | struct nf_conntrack_zone tmp; |
9fb9cbb1 | 1259 | struct nf_conn *ct; |
99f07e91 | 1260 | u32 hash; |
9fb9cbb1 | 1261 | |
bbe735e4 | 1262 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
a31f1adc | 1263 | dataoff, l3num, protonum, net, &tuple, l3proto, |
605dcad6 | 1264 | l4proto)) { |
ccd63c20 | 1265 | pr_debug("Can't get tuple\n"); |
fc09e4a7 | 1266 | return 0; |
9fb9cbb1 YK |
1267 | } |
1268 | ||
1269 | /* look for tuple match */ | |
5e8018fc | 1270 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
1b8c8a9f | 1271 | hash = hash_conntrack_raw(&tuple, net); |
99f07e91 | 1272 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
9fb9cbb1 | 1273 | if (!h) { |
b2a15a60 | 1274 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 1275 | skb, dataoff, hash); |
9fb9cbb1 | 1276 | if (!h) |
fc09e4a7 | 1277 | return 0; |
9fb9cbb1 | 1278 | if (IS_ERR(h)) |
fc09e4a7 | 1279 | return PTR_ERR(h); |
9fb9cbb1 YK |
1280 | } |
1281 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1282 | ||
1283 | /* It exists; we have (non-exclusive) reference. */ | |
1284 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fc09e4a7 | 1285 | ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
1286 | } else { |
1287 | /* Once we've had two way comms, always ESTABLISHED. */ | |
1288 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
ccd63c20 | 1289 | pr_debug("normal packet for %p\n", ct); |
fc09e4a7 | 1290 | ctinfo = IP_CT_ESTABLISHED; |
9fb9cbb1 | 1291 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
ccd63c20 | 1292 | pr_debug("related packet for %p\n", ct); |
fc09e4a7 | 1293 | ctinfo = IP_CT_RELATED; |
9fb9cbb1 | 1294 | } else { |
ccd63c20 | 1295 | pr_debug("new packet for %p\n", ct); |
fc09e4a7 | 1296 | ctinfo = IP_CT_NEW; |
9fb9cbb1 | 1297 | } |
9fb9cbb1 | 1298 | } |
fc09e4a7 FW |
1299 | nf_ct_set(skb, ct, ctinfo); |
1300 | return 0; | |
9fb9cbb1 YK |
1301 | } |
1302 | ||
1303 | unsigned int | |
a702a65f AD |
1304 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
1305 | struct sk_buff *skb) | |
9fb9cbb1 | 1306 | { |
97a6ad13 | 1307 | struct nf_conn *ct, *tmpl; |
9fb9cbb1 YK |
1308 | enum ip_conntrack_info ctinfo; |
1309 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 1310 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 1311 | unsigned int *timeouts; |
9fb9cbb1 YK |
1312 | unsigned int dataoff; |
1313 | u_int8_t protonum; | |
9fb9cbb1 YK |
1314 | int ret; |
1315 | ||
97a6ad13 FW |
1316 | tmpl = nf_ct_get(skb, &ctinfo); |
1317 | if (tmpl) { | |
b2a15a60 | 1318 | /* Previously seen (loopback or untracked)? Ignore. */ |
b2a15a60 PM |
1319 | if (!nf_ct_is_template(tmpl)) { |
1320 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
1321 | return NF_ACCEPT; | |
1322 | } | |
a9e419dc | 1323 | skb->_nfct = 0; |
9fb9cbb1 YK |
1324 | } |
1325 | ||
e2361cb9 | 1326 | /* rcu_read_lock()ed by nf_hook_thresh */ |
76108cea | 1327 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 1328 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
1329 | &dataoff, &protonum); |
1330 | if (ret <= 0) { | |
25985edc | 1331 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
1332 | NF_CT_STAT_INC_ATOMIC(net, error); |
1333 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1334 | ret = -ret; |
1335 | goto out; | |
9fb9cbb1 YK |
1336 | } |
1337 | ||
76108cea | 1338 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
1339 | |
1340 | /* It may be an special packet, error, unclean... | |
1341 | * inverse of the return code tells to the netfilter | |
1342 | * core what to do with the packet. */ | |
74c51a14 | 1343 | if (l4proto->error != NULL) { |
11df4b76 | 1344 | ret = l4proto->error(net, tmpl, skb, dataoff, pf, hooknum); |
74c51a14 | 1345 | if (ret <= 0) { |
0d55af87 AD |
1346 | NF_CT_STAT_INC_ATOMIC(net, error); |
1347 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
1348 | ret = -ret; |
1349 | goto out; | |
74c51a14 | 1350 | } |
88ed01d1 | 1351 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
a9e419dc | 1352 | if (skb->_nfct) |
88ed01d1 | 1353 | goto out; |
9fb9cbb1 | 1354 | } |
08733a0c | 1355 | repeat: |
fc09e4a7 FW |
1356 | ret = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
1357 | l3proto, l4proto); | |
1358 | if (ret < 0) { | |
9fb9cbb1 | 1359 | /* Too stressed to deal. */ |
0d55af87 | 1360 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
1361 | ret = NF_DROP; |
1362 | goto out; | |
9fb9cbb1 YK |
1363 | } |
1364 | ||
fc09e4a7 FW |
1365 | ct = nf_ct_get(skb, &ctinfo); |
1366 | if (!ct) { | |
1367 | /* Not valid part of a connection */ | |
1368 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
1369 | ret = NF_ACCEPT; | |
1370 | goto out; | |
1371 | } | |
9fb9cbb1 | 1372 | |
60b5f8f7 | 1373 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1374 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1375 | |
2c8503f5 | 1376 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1377 | if (ret <= 0) { |
9fb9cbb1 YK |
1378 | /* Invalid: inverse of the return code tells |
1379 | * the netfilter core what to do */ | |
0d53778e | 1380 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
97a6ad13 | 1381 | nf_conntrack_put(&ct->ct_general); |
a9e419dc | 1382 | skb->_nfct = 0; |
0d55af87 | 1383 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1384 | if (ret == -NF_DROP) |
1385 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
56a62e22 AB |
1386 | /* Special case: TCP tracker reports an attempt to reopen a |
1387 | * closed/aborted connection. We have to go back and create a | |
1388 | * fresh conntrack. | |
1389 | */ | |
1390 | if (ret == -NF_REPEAT) | |
1391 | goto repeat; | |
b2a15a60 PM |
1392 | ret = -ret; |
1393 | goto out; | |
9fb9cbb1 YK |
1394 | } |
1395 | ||
fc09e4a7 FW |
1396 | if (ctinfo == IP_CT_ESTABLISHED_REPLY && |
1397 | !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1398 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1399 | out: |
56a62e22 AB |
1400 | if (tmpl) |
1401 | nf_ct_put(tmpl); | |
9fb9cbb1 YK |
1402 | |
1403 | return ret; | |
1404 | } | |
13b18339 | 1405 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1406 | |
5f2b4c90 JE |
1407 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1408 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1409 | { |
5f2b4c90 | 1410 | bool ret; |
923f4902 PM |
1411 | |
1412 | rcu_read_lock(); | |
1413 | ret = nf_ct_invert_tuple(inverse, orig, | |
1414 | __nf_ct_l3proto_find(orig->src.l3num), | |
1415 | __nf_ct_l4proto_find(orig->src.l3num, | |
1416 | orig->dst.protonum)); | |
1417 | rcu_read_unlock(); | |
1418 | return ret; | |
9fb9cbb1 | 1419 | } |
13b18339 | 1420 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1421 | |
5b1158e9 JK |
1422 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1423 | implicitly racy: see __nf_conntrack_confirm */ | |
1424 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1425 | const struct nf_conntrack_tuple *newreply) | |
1426 | { | |
1427 | struct nf_conn_help *help = nfct_help(ct); | |
1428 | ||
5b1158e9 JK |
1429 | /* Should be unconfirmed, so not in hash table yet */ |
1430 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1431 | ||
0d53778e | 1432 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1433 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1434 | |
1435 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1436 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1437 | return; |
ceceae1b | 1438 | |
c52fbb41 | 1439 | rcu_read_lock(); |
b2a15a60 | 1440 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1441 | rcu_read_unlock(); |
5b1158e9 | 1442 | } |
13b18339 | 1443 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1444 | |
9fb9cbb1 YK |
1445 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1446 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1447 | enum ip_conntrack_info ctinfo, | |
1448 | const struct sk_buff *skb, | |
1449 | unsigned long extra_jiffies, | |
1450 | int do_acct) | |
1451 | { | |
9fb9cbb1 YK |
1452 | NF_CT_ASSERT(skb); |
1453 | ||
997ae831 | 1454 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1455 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1456 | goto acct; | |
997ae831 | 1457 | |
9fb9cbb1 | 1458 | /* If not in hash table, timer will not be active yet */ |
f330a7fd FW |
1459 | if (nf_ct_is_confirmed(ct)) |
1460 | extra_jiffies += nfct_time_stamp; | |
9fb9cbb1 | 1461 | |
f330a7fd | 1462 | ct->timeout = extra_jiffies; |
47d95045 | 1463 | acct: |
ba76738c PNA |
1464 | if (do_acct) |
1465 | nf_ct_acct_update(ct, ctinfo, skb->len); | |
9fb9cbb1 | 1466 | } |
13b18339 | 1467 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1468 | |
ad66713f FW |
1469 | bool nf_ct_kill_acct(struct nf_conn *ct, |
1470 | enum ip_conntrack_info ctinfo, | |
1471 | const struct sk_buff *skb) | |
51091764 | 1472 | { |
ad66713f | 1473 | nf_ct_acct_update(ct, ctinfo, skb->len); |
58401572 | 1474 | |
f330a7fd | 1475 | return nf_ct_delete(ct, 0, 0); |
51091764 | 1476 | } |
ad66713f | 1477 | EXPORT_SYMBOL_GPL(nf_ct_kill_acct); |
51091764 | 1478 | |
c0cd1156 | 1479 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1480 | |
1481 | #include <linux/netfilter/nfnetlink.h> | |
1482 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1483 | #include <linux/mutex.h> |
1484 | ||
c1d10adb PNA |
1485 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1486 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1487 | * or depend on ctnetlink */ | |
fdf70832 | 1488 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1489 | const struct nf_conntrack_tuple *tuple) |
1490 | { | |
bae65be8 DM |
1491 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1492 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1493 | goto nla_put_failure; | |
c1d10adb PNA |
1494 | return 0; |
1495 | ||
df6fb868 | 1496 | nla_put_failure: |
c1d10adb PNA |
1497 | return -1; |
1498 | } | |
fdf70832 | 1499 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1500 | |
f73e924c PM |
1501 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1502 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1503 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1504 | }; |
f73e924c | 1505 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1506 | |
fdf70832 | 1507 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1508 | struct nf_conntrack_tuple *t) |
1509 | { | |
df6fb868 | 1510 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1511 | return -EINVAL; |
1512 | ||
77236b6e PM |
1513 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1514 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1515 | |
1516 | return 0; | |
1517 | } | |
fdf70832 | 1518 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1519 | |
1520 | int nf_ct_port_nlattr_tuple_size(void) | |
1521 | { | |
1522 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1523 | } | |
1524 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1525 | #endif |
1526 | ||
9fb9cbb1 | 1527 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1528 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1529 | { |
1530 | struct nf_conn *ct; | |
1531 | enum ip_conntrack_info ctinfo; | |
1532 | ||
1533 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1534 | ct = nf_ct_get(skb, &ctinfo); | |
1535 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1536 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1537 | else |
1538 | ctinfo = IP_CT_RELATED; | |
1539 | ||
1540 | /* Attach to new skbuff, and increment count */ | |
c74454fa | 1541 | nf_ct_set(nskb, ct, ctinfo); |
cb9c6836 | 1542 | nf_conntrack_get(skb_nfct(nskb)); |
9fb9cbb1 YK |
1543 | } |
1544 | ||
9fb9cbb1 | 1545 | /* Bring out ya dead! */ |
df0933dc | 1546 | static struct nf_conn * |
400dad39 | 1547 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1548 | void *data, unsigned int *bucket) |
1549 | { | |
df0933dc PM |
1550 | struct nf_conntrack_tuple_hash *h; |
1551 | struct nf_conn *ct; | |
ea781f19 | 1552 | struct hlist_nulls_node *n; |
b7779d06 | 1553 | int cpu; |
93bb0ceb | 1554 | spinlock_t *lockp; |
9fb9cbb1 | 1555 | |
56d52d48 | 1556 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
93bb0ceb JDB |
1557 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
1558 | local_bh_disable(); | |
b16c2919 | 1559 | nf_conntrack_lock(lockp); |
56d52d48 FW |
1560 | if (*bucket < nf_conntrack_htable_size) { |
1561 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) { | |
93bb0ceb JDB |
1562 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1563 | continue; | |
1564 | ct = nf_ct_tuplehash_to_ctrack(h); | |
e0c7d472 FW |
1565 | if (net_eq(nf_ct_net(ct), net) && |
1566 | iter(ct, data)) | |
93bb0ceb JDB |
1567 | goto found; |
1568 | } | |
df0933dc | 1569 | } |
93bb0ceb JDB |
1570 | spin_unlock(lockp); |
1571 | local_bh_enable(); | |
d93c6258 | 1572 | cond_resched(); |
601e68e1 | 1573 | } |
b7779d06 JDB |
1574 | |
1575 | for_each_possible_cpu(cpu) { | |
1576 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1577 | ||
1578 | spin_lock_bh(&pcpu->lock); | |
1579 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { | |
1580 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1581 | if (iter(ct, data)) | |
1582 | set_bit(IPS_DYING_BIT, &ct->status); | |
1583 | } | |
1584 | spin_unlock_bh(&pcpu->lock); | |
d93c6258 | 1585 | cond_resched(); |
b7779d06 | 1586 | } |
df0933dc PM |
1587 | return NULL; |
1588 | found: | |
c073e3fa | 1589 | atomic_inc(&ct->ct_general.use); |
93bb0ceb JDB |
1590 | spin_unlock(lockp); |
1591 | local_bh_enable(); | |
df0933dc | 1592 | return ct; |
9fb9cbb1 YK |
1593 | } |
1594 | ||
400dad39 AD |
1595 | void nf_ct_iterate_cleanup(struct net *net, |
1596 | int (*iter)(struct nf_conn *i, void *data), | |
c655bc68 | 1597 | void *data, u32 portid, int report) |
9fb9cbb1 | 1598 | { |
df0933dc | 1599 | struct nf_conn *ct; |
9fb9cbb1 YK |
1600 | unsigned int bucket = 0; |
1601 | ||
d93c6258 FW |
1602 | might_sleep(); |
1603 | ||
88b68bc5 FW |
1604 | if (atomic_read(&net->ct.count) == 0) |
1605 | return; | |
1606 | ||
400dad39 | 1607 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 | 1608 | /* Time to push up daises... */ |
9fb9cbb1 | 1609 | |
f330a7fd | 1610 | nf_ct_delete(ct, portid, report); |
9fb9cbb1 | 1611 | nf_ct_put(ct); |
d93c6258 | 1612 | cond_resched(); |
9fb9cbb1 YK |
1613 | } |
1614 | } | |
13b18339 | 1615 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1616 | |
274d383b PNA |
1617 | static int kill_all(struct nf_conn *i, void *data) |
1618 | { | |
1619 | return 1; | |
1620 | } | |
1621 | ||
d862a662 | 1622 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1623 | { |
d862a662 | 1624 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1625 | vfree(hash); |
1626 | else | |
601e68e1 | 1627 | free_pages((unsigned long)hash, |
f205c5e0 | 1628 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1629 | } |
ac565e5f | 1630 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1631 | |
b3c5163f ED |
1632 | static int untrack_refs(void) |
1633 | { | |
1634 | int cnt = 0, cpu; | |
1635 | ||
1636 | for_each_possible_cpu(cpu) { | |
1637 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1638 | ||
1639 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1640 | } | |
1641 | return cnt; | |
1642 | } | |
1643 | ||
f94161c1 | 1644 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1645 | { |
b87a2f91 | 1646 | conntrack_gc_work.exiting = true; |
f94161c1 G |
1647 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1648 | } | |
1649 | ||
1650 | void nf_conntrack_cleanup_end(void) | |
1651 | { | |
1652 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1653 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1654 | schedule(); |
1655 | ||
b87a2f91 | 1656 | cancel_delayed_work_sync(&conntrack_gc_work.dwork); |
56d52d48 FW |
1657 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
1658 | ||
04d87001 | 1659 | nf_conntrack_proto_fini(); |
41d73ec0 | 1660 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 1661 | nf_conntrack_labels_fini(); |
5e615b22 | 1662 | nf_conntrack_helper_fini(); |
8684094c | 1663 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1664 | nf_conntrack_ecache_fini(); |
73f4001a | 1665 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1666 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1667 | nf_conntrack_expect_fini(); |
77571149 FW |
1668 | |
1669 | kmem_cache_destroy(nf_conntrack_cachep); | |
08f6547d | 1670 | } |
9fb9cbb1 | 1671 | |
f94161c1 G |
1672 | /* |
1673 | * Mishearing the voices in his head, our hero wonders how he's | |
1674 | * supposed to kill the mall. | |
1675 | */ | |
1676 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1677 | { |
dece40e8 VD |
1678 | LIST_HEAD(single); |
1679 | ||
1680 | list_add(&net->exit_list, &single); | |
1681 | nf_conntrack_cleanup_net_list(&single); | |
1682 | } | |
1683 | ||
1684 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1685 | { | |
1686 | int busy; | |
1687 | struct net *net; | |
1688 | ||
f94161c1 G |
1689 | /* |
1690 | * This makes sure all current packets have passed through | |
1691 | * netfilter framework. Roll on, two-stage module | |
1692 | * delete... | |
1693 | */ | |
1694 | synchronize_net(); | |
dece40e8 VD |
1695 | i_see_dead_people: |
1696 | busy = 0; | |
1697 | list_for_each_entry(net, net_exit_list, exit_list) { | |
c655bc68 | 1698 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
dece40e8 VD |
1699 | if (atomic_read(&net->ct.count) != 0) |
1700 | busy = 1; | |
1701 | } | |
1702 | if (busy) { | |
9fb9cbb1 YK |
1703 | schedule(); |
1704 | goto i_see_dead_people; | |
1705 | } | |
1706 | ||
dece40e8 | 1707 | list_for_each_entry(net, net_exit_list, exit_list) { |
dece40e8 VD |
1708 | nf_conntrack_proto_pernet_fini(net); |
1709 | nf_conntrack_helper_pernet_fini(net); | |
1710 | nf_conntrack_ecache_pernet_fini(net); | |
1711 | nf_conntrack_tstamp_pernet_fini(net); | |
1712 | nf_conntrack_acct_pernet_fini(net); | |
1713 | nf_conntrack_expect_pernet_fini(net); | |
dece40e8 | 1714 | free_percpu(net->ct.stat); |
b7779d06 | 1715 | free_percpu(net->ct.pcpu_lists); |
dece40e8 | 1716 | } |
08f6547d AD |
1717 | } |
1718 | ||
d862a662 | 1719 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1720 | { |
ea781f19 ED |
1721 | struct hlist_nulls_head *hash; |
1722 | unsigned int nr_slots, i; | |
1723 | size_t sz; | |
9fb9cbb1 | 1724 | |
9cc1c73a FW |
1725 | if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) |
1726 | return NULL; | |
1727 | ||
ea781f19 ED |
1728 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1729 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
9cc1c73a FW |
1730 | |
1731 | if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head))) | |
1732 | return NULL; | |
1733 | ||
ea781f19 ED |
1734 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
1735 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1736 | get_order(sz)); | |
f0ad4621 | 1737 | if (!hash) |
966567b7 | 1738 | hash = vzalloc(sz); |
9fb9cbb1 | 1739 | |
ea781f19 ED |
1740 | if (hash && nulls) |
1741 | for (i = 0; i < nr_slots; i++) | |
1742 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1743 | |
1744 | return hash; | |
1745 | } | |
ac565e5f | 1746 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1747 | |
3183ab89 | 1748 | int nf_conntrack_hash_resize(unsigned int hashsize) |
9fb9cbb1 | 1749 | { |
3183ab89 FW |
1750 | int i, bucket; |
1751 | unsigned int old_size; | |
ea781f19 | 1752 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1753 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1754 | struct nf_conn *ct; |
9fb9cbb1 | 1755 | |
9fb9cbb1 YK |
1756 | if (!hashsize) |
1757 | return -EINVAL; | |
1758 | ||
d862a662 | 1759 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1760 | if (!hash) |
1761 | return -ENOMEM; | |
1762 | ||
3183ab89 FW |
1763 | old_size = nf_conntrack_htable_size; |
1764 | if (old_size == hashsize) { | |
1765 | nf_ct_free_hashtable(hash, hashsize); | |
1766 | return 0; | |
1767 | } | |
1768 | ||
93bb0ceb JDB |
1769 | local_bh_disable(); |
1770 | nf_conntrack_all_lock(); | |
a3efd812 | 1771 | write_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb | 1772 | |
76507f69 PM |
1773 | /* Lookups in the old hash might happen in parallel, which means we |
1774 | * might get false negatives during connection lookup. New connections | |
1775 | * created because of a false negative won't make it into the hash | |
93bb0ceb | 1776 | * though since that required taking the locks. |
76507f69 | 1777 | */ |
93bb0ceb | 1778 | |
56d52d48 FW |
1779 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
1780 | while (!hlist_nulls_empty(&nf_conntrack_hash[i])) { | |
1781 | h = hlist_nulls_entry(nf_conntrack_hash[i].first, | |
1782 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1783 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1784 | hlist_nulls_del_rcu(&h->hnnode); |
1b8c8a9f FW |
1785 | bucket = __hash_conntrack(nf_ct_net(ct), |
1786 | &h->tuple, hashsize); | |
ea781f19 | 1787 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1788 | } |
1789 | } | |
56d52d48 FW |
1790 | old_size = nf_conntrack_htable_size; |
1791 | old_hash = nf_conntrack_hash; | |
9fb9cbb1 | 1792 | |
56d52d48 FW |
1793 | nf_conntrack_hash = hash; |
1794 | nf_conntrack_htable_size = hashsize; | |
93bb0ceb | 1795 | |
a3efd812 | 1796 | write_seqcount_end(&nf_conntrack_generation); |
93bb0ceb JDB |
1797 | nf_conntrack_all_unlock(); |
1798 | local_bh_enable(); | |
9fb9cbb1 | 1799 | |
5e3c61f9 | 1800 | synchronize_net(); |
d862a662 | 1801 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1802 | return 0; |
1803 | } | |
3183ab89 FW |
1804 | |
1805 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) | |
1806 | { | |
1807 | unsigned int hashsize; | |
1808 | int rc; | |
1809 | ||
1810 | if (current->nsproxy->net_ns != &init_net) | |
1811 | return -EOPNOTSUPP; | |
1812 | ||
1813 | /* On boot, we can set this without any fancy locking. */ | |
1814 | if (!nf_conntrack_htable_size) | |
1815 | return param_set_uint(val, kp); | |
1816 | ||
1817 | rc = kstrtouint(val, 0, &hashsize); | |
1818 | if (rc) | |
1819 | return rc; | |
1820 | ||
1821 | return nf_conntrack_hash_resize(hashsize); | |
1822 | } | |
fae718dd | 1823 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1824 | |
fae718dd | 1825 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1826 | &nf_conntrack_htable_size, 0600); |
1827 | ||
5bfddbd4 ED |
1828 | void nf_ct_untracked_status_or(unsigned long bits) |
1829 | { | |
b3c5163f ED |
1830 | int cpu; |
1831 | ||
1832 | for_each_possible_cpu(cpu) | |
1833 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1834 | } |
1835 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1836 | ||
f94161c1 | 1837 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1838 | { |
f205c5e0 | 1839 | int max_factor = 8; |
0c5366b3 FW |
1840 | int ret = -ENOMEM; |
1841 | int i, cpu; | |
93bb0ceb | 1842 | |
a3efd812 FW |
1843 | seqcount_init(&nf_conntrack_generation); |
1844 | ||
d5d20912 | 1845 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
93bb0ceb | 1846 | spin_lock_init(&nf_conntrack_locks[i]); |
9fb9cbb1 | 1847 | |
9fb9cbb1 | 1848 | if (!nf_conntrack_htable_size) { |
88eab472 ML |
1849 | /* Idea from tcp.c: use 1/16384 of memory. |
1850 | * On i386: 32MB machine has 512 buckets. | |
1851 | * >= 1GB machines have 16384 buckets. | |
1852 | * >= 4GB machines have 65536 buckets. | |
1853 | */ | |
9fb9cbb1 | 1854 | nf_conntrack_htable_size |
4481374c | 1855 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1856 | / sizeof(struct hlist_head)); |
88eab472 ML |
1857 | if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
1858 | nf_conntrack_htable_size = 65536; | |
1859 | else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) | |
f205c5e0 PM |
1860 | nf_conntrack_htable_size = 16384; |
1861 | if (nf_conntrack_htable_size < 32) | |
1862 | nf_conntrack_htable_size = 32; | |
1863 | ||
1864 | /* Use a max. factor of four by default to get the same max as | |
1865 | * with the old struct list_heads. When a table size is given | |
1866 | * we use the old value of 8 to avoid reducing the max. | |
1867 | * entries. */ | |
1868 | max_factor = 4; | |
9fb9cbb1 | 1869 | } |
56d52d48 FW |
1870 | |
1871 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1); | |
1872 | if (!nf_conntrack_hash) | |
1873 | return -ENOMEM; | |
1874 | ||
f205c5e0 | 1875 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1876 | |
0c5366b3 | 1877 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
a9e419dc FW |
1878 | sizeof(struct nf_conn), |
1879 | NFCT_INFOMASK + 1, | |
5a75cdeb | 1880 | SLAB_DESTROY_BY_RCU | SLAB_HWCACHE_ALIGN, NULL); |
0c5366b3 FW |
1881 | if (!nf_conntrack_cachep) |
1882 | goto err_cachep; | |
1883 | ||
654d0fbd | 1884 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1885 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1886 | nf_conntrack_max); | |
83b4dbe1 G |
1887 | |
1888 | ret = nf_conntrack_expect_init(); | |
1889 | if (ret < 0) | |
1890 | goto err_expect; | |
1891 | ||
b7ff3a1f G |
1892 | ret = nf_conntrack_acct_init(); |
1893 | if (ret < 0) | |
1894 | goto err_acct; | |
1895 | ||
73f4001a G |
1896 | ret = nf_conntrack_tstamp_init(); |
1897 | if (ret < 0) | |
1898 | goto err_tstamp; | |
1899 | ||
3fe0f943 G |
1900 | ret = nf_conntrack_ecache_init(); |
1901 | if (ret < 0) | |
1902 | goto err_ecache; | |
1903 | ||
8684094c G |
1904 | ret = nf_conntrack_timeout_init(); |
1905 | if (ret < 0) | |
1906 | goto err_timeout; | |
1907 | ||
5e615b22 G |
1908 | ret = nf_conntrack_helper_init(); |
1909 | if (ret < 0) | |
1910 | goto err_helper; | |
1911 | ||
5f69b8f5 G |
1912 | ret = nf_conntrack_labels_init(); |
1913 | if (ret < 0) | |
1914 | goto err_labels; | |
1915 | ||
41d73ec0 PM |
1916 | ret = nf_conntrack_seqadj_init(); |
1917 | if (ret < 0) | |
1918 | goto err_seqadj; | |
1919 | ||
04d87001 G |
1920 | ret = nf_conntrack_proto_init(); |
1921 | if (ret < 0) | |
1922 | goto err_proto; | |
1923 | ||
9edd7ca0 | 1924 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1925 | for_each_possible_cpu(cpu) { |
1926 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1927 | write_pnet(&ct->ct_net, &init_net); |
1928 | atomic_set(&ct->ct_general.use, 1); | |
1929 | } | |
9edd7ca0 | 1930 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1931 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
b87a2f91 FW |
1932 | |
1933 | conntrack_gc_work_init(&conntrack_gc_work); | |
e5072053 | 1934 | queue_delayed_work(system_long_wq, &conntrack_gc_work.dwork, HZ); |
b87a2f91 | 1935 | |
08f6547d AD |
1936 | return 0; |
1937 | ||
04d87001 | 1938 | err_proto: |
41d73ec0 PM |
1939 | nf_conntrack_seqadj_fini(); |
1940 | err_seqadj: | |
04d87001 | 1941 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1942 | err_labels: |
1943 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1944 | err_helper: |
1945 | nf_conntrack_timeout_fini(); | |
8684094c G |
1946 | err_timeout: |
1947 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1948 | err_ecache: |
1949 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1950 | err_tstamp: |
1951 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1952 | err_acct: |
1953 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1954 | err_expect: |
0c5366b3 FW |
1955 | kmem_cache_destroy(nf_conntrack_cachep); |
1956 | err_cachep: | |
56d52d48 | 1957 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
08f6547d AD |
1958 | return ret; |
1959 | } | |
1960 | ||
f94161c1 G |
1961 | void nf_conntrack_init_end(void) |
1962 | { | |
1963 | /* For use by REJECT target */ | |
1964 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1965 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
f94161c1 G |
1966 | } |
1967 | ||
8cc20198 ED |
1968 | /* |
1969 | * We need to use special "null" values, not used in hash table | |
1970 | */ | |
1971 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1972 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1973 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1974 | |
f94161c1 | 1975 | int nf_conntrack_init_net(struct net *net) |
08f6547d | 1976 | { |
b7779d06 JDB |
1977 | int ret = -ENOMEM; |
1978 | int cpu; | |
ceceae1b | 1979 | |
08f6547d | 1980 | atomic_set(&net->ct.count, 0); |
b7779d06 JDB |
1981 | |
1982 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); | |
1983 | if (!net->ct.pcpu_lists) | |
08f6547d | 1984 | goto err_stat; |
b7779d06 JDB |
1985 | |
1986 | for_each_possible_cpu(cpu) { | |
1987 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
1988 | ||
1989 | spin_lock_init(&pcpu->lock); | |
1990 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); | |
1991 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); | |
08f6547d | 1992 | } |
5b3501fa | 1993 | |
b7779d06 JDB |
1994 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1995 | if (!net->ct.stat) | |
1996 | goto err_pcpu_lists; | |
1997 | ||
83b4dbe1 | 1998 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1999 | if (ret < 0) |
2000 | goto err_expect; | |
b7ff3a1f | 2001 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 2002 | if (ret < 0) |
08f6547d | 2003 | goto err_acct; |
73f4001a | 2004 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
2005 | if (ret < 0) |
2006 | goto err_tstamp; | |
3fe0f943 | 2007 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
2008 | if (ret < 0) |
2009 | goto err_ecache; | |
5e615b22 | 2010 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
2011 | if (ret < 0) |
2012 | goto err_helper; | |
04d87001 | 2013 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
2014 | if (ret < 0) |
2015 | goto err_proto; | |
08f6547d | 2016 | return 0; |
c539f017 | 2017 | |
f94161c1 | 2018 | err_proto: |
5e615b22 | 2019 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 2020 | err_helper: |
3fe0f943 | 2021 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 2022 | err_ecache: |
73f4001a | 2023 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 2024 | err_tstamp: |
b7ff3a1f | 2025 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 2026 | err_acct: |
83b4dbe1 | 2027 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 2028 | err_expect: |
0d55af87 | 2029 | free_percpu(net->ct.stat); |
b7779d06 JDB |
2030 | err_pcpu_lists: |
2031 | free_percpu(net->ct.pcpu_lists); | |
0d55af87 | 2032 | err_stat: |
08f6547d AD |
2033 | return ret; |
2034 | } |