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 | 39 | #include <net/netfilter/nf_conntrack.h> |
605dcad6 | 40 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 41 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 | 42 | #include <net/netfilter/nf_conntrack_helper.h> |
41d73ec0 | 43 | #include <net/netfilter/nf_conntrack_seqadj.h> |
9fb9cbb1 | 44 | #include <net/netfilter/nf_conntrack_core.h> |
ecfab2c9 | 45 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 46 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 47 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 48 | #include <net/netfilter/nf_conntrack_zones.h> |
a992ca2a | 49 | #include <net/netfilter/nf_conntrack_timestamp.h> |
dd705072 | 50 | #include <net/netfilter/nf_conntrack_timeout.h> |
c539f017 | 51 | #include <net/netfilter/nf_conntrack_labels.h> |
48b1de4c | 52 | #include <net/netfilter/nf_conntrack_synproxy.h> |
e6a7d3c0 | 53 | #include <net/netfilter/nf_nat.h> |
e17b666a | 54 | #include <net/netfilter/nf_nat_core.h> |
49376368 | 55 | #include <net/netfilter/nf_nat_helper.h> |
1b8c8a9f | 56 | #include <net/netns/hash.h> |
6816d931 | 57 | #include <net/ip.h> |
9fb9cbb1 | 58 | |
e2a75007 FW |
59 | #include "nf_internals.h" |
60 | ||
93bb0ceb JDB |
61 | __cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; |
62 | EXPORT_SYMBOL_GPL(nf_conntrack_locks); | |
9fb9cbb1 | 63 | |
ca7433df JDB |
64 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock); |
65 | EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock); | |
66 | ||
56d52d48 FW |
67 | struct hlist_nulls_head *nf_conntrack_hash __read_mostly; |
68 | EXPORT_SYMBOL_GPL(nf_conntrack_hash); | |
69 | ||
b87a2f91 FW |
70 | struct conntrack_gc_work { |
71 | struct delayed_work dwork; | |
72 | u32 last_bucket; | |
73 | bool exiting; | |
c6dd940b | 74 | bool early_drop; |
e0df8cae | 75 | long next_gc_run; |
b87a2f91 FW |
76 | }; |
77 | ||
0c5366b3 | 78 | static __read_mostly struct kmem_cache *nf_conntrack_cachep; |
b16c2919 | 79 | static __read_mostly spinlock_t nf_conntrack_locks_all_lock; |
70d72b7e | 80 | static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock); |
b16c2919 SL |
81 | static __read_mostly bool nf_conntrack_locks_all; |
82 | ||
e0df8cae | 83 | /* every gc cycle scans at most 1/GC_MAX_BUCKETS_DIV part of table */ |
e5072053 FW |
84 | #define GC_MAX_BUCKETS_DIV 128u |
85 | /* upper bound of full table scan */ | |
86 | #define GC_MAX_SCAN_JIFFIES (16u * HZ) | |
87 | /* desired ratio of entries found to be expired */ | |
88 | #define GC_EVICT_RATIO 50u | |
b87a2f91 FW |
89 | |
90 | static struct conntrack_gc_work conntrack_gc_work; | |
91 | ||
b16c2919 SL |
92 | void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) |
93 | { | |
3ef0c7a7 | 94 | /* 1) Acquire the lock */ |
b16c2919 | 95 | spin_lock(lock); |
b316ff78 | 96 | |
3ef0c7a7 MS |
97 | /* 2) read nf_conntrack_locks_all, with ACQUIRE semantics |
98 | * It pairs with the smp_store_release() in nf_conntrack_all_unlock() | |
99 | */ | |
100 | if (likely(smp_load_acquire(&nf_conntrack_locks_all) == false)) | |
101 | return; | |
102 | ||
103 | /* fast path failed, unlock */ | |
104 | spin_unlock(lock); | |
105 | ||
106 | /* Slow path 1) get global lock */ | |
107 | spin_lock(&nf_conntrack_locks_all_lock); | |
108 | ||
109 | /* Slow path 2) get the lock we want */ | |
110 | spin_lock(lock); | |
111 | ||
112 | /* Slow path 3) release the global lock */ | |
113 | spin_unlock(&nf_conntrack_locks_all_lock); | |
b16c2919 SL |
114 | } |
115 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); | |
116 | ||
93bb0ceb JDB |
117 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
118 | { | |
119 | h1 %= CONNTRACK_LOCKS; | |
120 | h2 %= CONNTRACK_LOCKS; | |
121 | spin_unlock(&nf_conntrack_locks[h1]); | |
122 | if (h1 != h2) | |
123 | spin_unlock(&nf_conntrack_locks[h2]); | |
124 | } | |
125 | ||
126 | /* return true if we need to recompute hashes (in case hash table was resized) */ | |
127 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, | |
128 | unsigned int h2, unsigned int sequence) | |
129 | { | |
130 | h1 %= CONNTRACK_LOCKS; | |
131 | h2 %= CONNTRACK_LOCKS; | |
132 | if (h1 <= h2) { | |
b16c2919 | 133 | nf_conntrack_lock(&nf_conntrack_locks[h1]); |
93bb0ceb JDB |
134 | if (h1 != h2) |
135 | spin_lock_nested(&nf_conntrack_locks[h2], | |
136 | SINGLE_DEPTH_NESTING); | |
137 | } else { | |
b16c2919 | 138 | nf_conntrack_lock(&nf_conntrack_locks[h2]); |
93bb0ceb JDB |
139 | spin_lock_nested(&nf_conntrack_locks[h1], |
140 | SINGLE_DEPTH_NESTING); | |
141 | } | |
a3efd812 | 142 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
93bb0ceb JDB |
143 | nf_conntrack_double_unlock(h1, h2); |
144 | return true; | |
145 | } | |
146 | return false; | |
147 | } | |
148 | ||
149 | static void nf_conntrack_all_lock(void) | |
150 | { | |
151 | int i; | |
152 | ||
b16c2919 | 153 | spin_lock(&nf_conntrack_locks_all_lock); |
b16c2919 | 154 | |
3ef0c7a7 | 155 | nf_conntrack_locks_all = true; |
b316ff78 | 156 | |
b16c2919 | 157 | for (i = 0; i < CONNTRACK_LOCKS; i++) { |
3ef0c7a7 MS |
158 | spin_lock(&nf_conntrack_locks[i]); |
159 | ||
160 | /* This spin_unlock provides the "release" to ensure that | |
161 | * nf_conntrack_locks_all==true is visible to everyone that | |
162 | * acquired spin_lock(&nf_conntrack_locks[]). | |
163 | */ | |
164 | spin_unlock(&nf_conntrack_locks[i]); | |
b16c2919 | 165 | } |
93bb0ceb JDB |
166 | } |
167 | ||
168 | static void nf_conntrack_all_unlock(void) | |
169 | { | |
3ef0c7a7 | 170 | /* All prior stores must be complete before we clear |
b316ff78 PZ |
171 | * 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock() |
172 | * might observe the false value but not the entire | |
3ef0c7a7 MS |
173 | * critical section. |
174 | * It pairs with the smp_load_acquire() in nf_conntrack_lock() | |
b316ff78 PZ |
175 | */ |
176 | smp_store_release(&nf_conntrack_locks_all, false); | |
b16c2919 | 177 | spin_unlock(&nf_conntrack_locks_all_lock); |
93bb0ceb JDB |
178 | } |
179 | ||
e2b7606c | 180 | unsigned int nf_conntrack_htable_size __read_mostly; |
2567c4ea PNA |
181 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
182 | ||
e478075c | 183 | unsigned int nf_conntrack_max __read_mostly; |
538c5672 | 184 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
92e47ba8 | 185 | seqcount_t nf_conntrack_generation __read_mostly; |
141658fb | 186 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
9fb9cbb1 | 187 | |
1b8c8a9f FW |
188 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, |
189 | const struct net *net) | |
9fb9cbb1 | 190 | { |
0794935e | 191 | unsigned int n; |
1b8c8a9f | 192 | u32 seed; |
0794935e | 193 | |
141658fb FW |
194 | get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd)); |
195 | ||
0794935e PM |
196 | /* The direction must be ignored, so we hash everything up to the |
197 | * destination ports (which is a multiple of 4) and treat the last | |
198 | * three bytes manually. | |
199 | */ | |
1b8c8a9f | 200 | seed = nf_conntrack_hash_rnd ^ net_hash_mix(net); |
0794935e | 201 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
1b8c8a9f | 202 | return jhash2((u32 *)tuple, n, seed ^ |
99f07e91 CG |
203 | (((__force __u16)tuple->dst.u.all << 16) | |
204 | tuple->dst.protonum)); | |
205 | } | |
206 | ||
56d52d48 | 207 | static u32 scale_hash(u32 hash) |
99f07e91 | 208 | { |
56d52d48 | 209 | return reciprocal_scale(hash, nf_conntrack_htable_size); |
99f07e91 | 210 | } |
0794935e | 211 | |
1b8c8a9f FW |
212 | static u32 __hash_conntrack(const struct net *net, |
213 | const struct nf_conntrack_tuple *tuple, | |
214 | unsigned int size) | |
99f07e91 | 215 | { |
1b8c8a9f | 216 | return reciprocal_scale(hash_conntrack_raw(tuple, net), size); |
9fb9cbb1 YK |
217 | } |
218 | ||
1b8c8a9f FW |
219 | static u32 hash_conntrack(const struct net *net, |
220 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 221 | { |
56d52d48 | 222 | return scale_hash(hash_conntrack_raw(tuple, net)); |
9fb9cbb1 YK |
223 | } |
224 | ||
60e3be94 | 225 | static bool |
9fb9cbb1 YK |
226 | nf_ct_get_tuple(const struct sk_buff *skb, |
227 | unsigned int nhoff, | |
228 | unsigned int dataoff, | |
229 | u_int16_t l3num, | |
230 | u_int8_t protonum, | |
a31f1adc | 231 | struct net *net, |
9fb9cbb1 | 232 | struct nf_conntrack_tuple *tuple, |
605dcad6 | 233 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 234 | { |
47a91b14 FW |
235 | unsigned int size; |
236 | const __be32 *ap; | |
237 | __be32 _addrs[8]; | |
97e08cae FW |
238 | struct { |
239 | __be16 sport; | |
240 | __be16 dport; | |
241 | } _inet_hdr, *inet_hdr; | |
47a91b14 | 242 | |
443a70d5 | 243 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
244 | |
245 | tuple->src.l3num = l3num; | |
47a91b14 FW |
246 | switch (l3num) { |
247 | case NFPROTO_IPV4: | |
248 | nhoff += offsetof(struct iphdr, saddr); | |
249 | size = 2 * sizeof(__be32); | |
250 | break; | |
251 | case NFPROTO_IPV6: | |
252 | nhoff += offsetof(struct ipv6hdr, saddr); | |
253 | size = sizeof(_addrs); | |
254 | break; | |
255 | default: | |
256 | return true; | |
257 | } | |
258 | ||
259 | ap = skb_header_pointer(skb, nhoff, size, _addrs); | |
260 | if (!ap) | |
5f2b4c90 | 261 | return false; |
9fb9cbb1 | 262 | |
47a91b14 FW |
263 | switch (l3num) { |
264 | case NFPROTO_IPV4: | |
265 | tuple->src.u3.ip = ap[0]; | |
266 | tuple->dst.u3.ip = ap[1]; | |
267 | break; | |
268 | case NFPROTO_IPV6: | |
269 | memcpy(tuple->src.u3.ip6, ap, sizeof(tuple->src.u3.ip6)); | |
270 | memcpy(tuple->dst.u3.ip6, ap + 4, sizeof(tuple->dst.u3.ip6)); | |
271 | break; | |
272 | } | |
273 | ||
9fb9cbb1 YK |
274 | tuple->dst.protonum = protonum; |
275 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
276 | ||
97e08cae FW |
277 | if (unlikely(l4proto->pkt_to_tuple)) |
278 | return l4proto->pkt_to_tuple(skb, dataoff, net, tuple); | |
279 | ||
280 | /* Actually only need first 4 bytes to get ports. */ | |
281 | inet_hdr = skb_header_pointer(skb, dataoff, sizeof(_inet_hdr), &_inet_hdr); | |
282 | if (!inet_hdr) | |
283 | return false; | |
284 | ||
285 | tuple->src.u.udp.port = inet_hdr->sport; | |
286 | tuple->dst.u.udp.port = inet_hdr->dport; | |
287 | return true; | |
9fb9cbb1 YK |
288 | } |
289 | ||
6816d931 FW |
290 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
291 | u_int8_t *protonum) | |
292 | { | |
293 | int dataoff = -1; | |
6816d931 FW |
294 | const struct iphdr *iph; |
295 | struct iphdr _iph; | |
296 | ||
297 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
298 | if (!iph) | |
299 | return -1; | |
300 | ||
301 | /* Conntrack defragments packets, we might still see fragments | |
302 | * inside ICMP packets though. | |
303 | */ | |
304 | if (iph->frag_off & htons(IP_OFFSET)) | |
305 | return -1; | |
306 | ||
307 | dataoff = nhoff + (iph->ihl << 2); | |
308 | *protonum = iph->protocol; | |
309 | ||
310 | /* Check bogus IP headers */ | |
311 | if (dataoff > skb->len) { | |
312 | pr_debug("bogus IPv4 packet: nhoff %u, ihl %u, skblen %u\n", | |
313 | nhoff, iph->ihl << 2, skb->len); | |
314 | return -1; | |
315 | } | |
6816d931 FW |
316 | return dataoff; |
317 | } | |
318 | ||
a0ae2562 | 319 | #if IS_ENABLED(CONFIG_IPV6) |
6816d931 FW |
320 | static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
321 | u8 *protonum) | |
322 | { | |
323 | int protoff = -1; | |
6816d931 FW |
324 | unsigned int extoff = nhoff + sizeof(struct ipv6hdr); |
325 | __be16 frag_off; | |
326 | u8 nexthdr; | |
327 | ||
328 | if (skb_copy_bits(skb, nhoff + offsetof(struct ipv6hdr, nexthdr), | |
329 | &nexthdr, sizeof(nexthdr)) != 0) { | |
330 | pr_debug("can't get nexthdr\n"); | |
331 | return -1; | |
332 | } | |
333 | protoff = ipv6_skip_exthdr(skb, extoff, &nexthdr, &frag_off); | |
334 | /* | |
335 | * (protoff == skb->len) means the packet has not data, just | |
336 | * IPv6 and possibly extensions headers, but it is tracked anyway | |
337 | */ | |
338 | if (protoff < 0 || (frag_off & htons(~0x7)) != 0) { | |
339 | pr_debug("can't find proto in pkt\n"); | |
340 | return -1; | |
341 | } | |
342 | ||
343 | *protonum = nexthdr; | |
6816d931 FW |
344 | return protoff; |
345 | } | |
a0ae2562 | 346 | #endif |
6816d931 FW |
347 | |
348 | static int get_l4proto(const struct sk_buff *skb, | |
349 | unsigned int nhoff, u8 pf, u8 *l4num) | |
350 | { | |
351 | switch (pf) { | |
352 | case NFPROTO_IPV4: | |
353 | return ipv4_get_l4proto(skb, nhoff, l4num); | |
a0ae2562 | 354 | #if IS_ENABLED(CONFIG_IPV6) |
6816d931 FW |
355 | case NFPROTO_IPV6: |
356 | return ipv6_get_l4proto(skb, nhoff, l4num); | |
a0ae2562 | 357 | #endif |
6816d931 FW |
358 | default: |
359 | *l4num = 0; | |
360 | break; | |
361 | } | |
362 | return -1; | |
9fb9cbb1 YK |
363 | } |
364 | ||
5f2b4c90 | 365 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
a31f1adc EB |
366 | u_int16_t l3num, |
367 | struct net *net, struct nf_conntrack_tuple *tuple) | |
e2a3123f | 368 | { |
b3480fe0 | 369 | const struct nf_conntrack_l4proto *l4proto; |
6816d931 FW |
370 | u8 protonum; |
371 | int protoff; | |
e2a3123f YK |
372 | int ret; |
373 | ||
374 | rcu_read_lock(); | |
375 | ||
6816d931 FW |
376 | protoff = get_l4proto(skb, nhoff, l3num, &protonum); |
377 | if (protoff <= 0) { | |
e2a3123f | 378 | rcu_read_unlock(); |
5f2b4c90 | 379 | return false; |
e2a3123f YK |
380 | } |
381 | ||
dd2934a9 | 382 | l4proto = __nf_ct_l4proto_find(protonum); |
e2a3123f | 383 | |
a31f1adc | 384 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple, |
47a91b14 | 385 | l4proto); |
e2a3123f YK |
386 | |
387 | rcu_read_unlock(); | |
388 | return ret; | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
391 | ||
5f2b4c90 | 392 | bool |
9fb9cbb1 YK |
393 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
394 | const struct nf_conntrack_tuple *orig, | |
605dcad6 | 395 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 396 | { |
443a70d5 | 397 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
398 | |
399 | inverse->src.l3num = orig->src.l3num; | |
d1b6fe94 FW |
400 | |
401 | switch (orig->src.l3num) { | |
402 | case NFPROTO_IPV4: | |
403 | inverse->src.u3.ip = orig->dst.u3.ip; | |
404 | inverse->dst.u3.ip = orig->src.u3.ip; | |
405 | break; | |
406 | case NFPROTO_IPV6: | |
407 | inverse->src.u3.in6 = orig->dst.u3.in6; | |
408 | inverse->dst.u3.in6 = orig->src.u3.in6; | |
409 | break; | |
410 | default: | |
411 | break; | |
412 | } | |
9fb9cbb1 YK |
413 | |
414 | inverse->dst.dir = !orig->dst.dir; | |
415 | ||
416 | inverse->dst.protonum = orig->dst.protonum; | |
8b3892ea FW |
417 | |
418 | if (unlikely(l4proto->invert_tuple)) | |
419 | return l4proto->invert_tuple(inverse, orig); | |
420 | ||
421 | inverse->src.u.all = orig->dst.u.all; | |
422 | inverse->dst.u.all = orig->src.u.all; | |
423 | return true; | |
9fb9cbb1 | 424 | } |
13b18339 | 425 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 426 | |
9fb9cbb1 YK |
427 | static void |
428 | clean_from_lists(struct nf_conn *ct) | |
429 | { | |
0d53778e | 430 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
431 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
432 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
433 | |
434 | /* Destroy all pending expectations */ | |
c1d10adb | 435 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
436 | } |
437 | ||
b7779d06 JDB |
438 | /* must be called with local_bh_disable */ |
439 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) | |
440 | { | |
441 | struct ct_pcpu *pcpu; | |
442 | ||
443 | /* add this conntrack to the (per cpu) dying list */ | |
444 | ct->cpu = smp_processor_id(); | |
445 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
446 | ||
447 | spin_lock(&pcpu->lock); | |
448 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
449 | &pcpu->dying); | |
450 | spin_unlock(&pcpu->lock); | |
451 | } | |
452 | ||
453 | /* must be called with local_bh_disable */ | |
454 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) | |
455 | { | |
456 | struct ct_pcpu *pcpu; | |
457 | ||
458 | /* add this conntrack to the (per cpu) unconfirmed list */ | |
459 | ct->cpu = smp_processor_id(); | |
460 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
461 | ||
462 | spin_lock(&pcpu->lock); | |
463 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
464 | &pcpu->unconfirmed); | |
465 | spin_unlock(&pcpu->lock); | |
466 | } | |
467 | ||
468 | /* must be called with local_bh_disable */ | |
469 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) | |
470 | { | |
471 | struct ct_pcpu *pcpu; | |
472 | ||
473 | /* We overload first tuple to link into unconfirmed or dying list.*/ | |
474 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); | |
475 | ||
476 | spin_lock(&pcpu->lock); | |
477 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
478 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
479 | spin_unlock(&pcpu->lock); | |
480 | } | |
481 | ||
30322309 FW |
482 | #define NFCT_ALIGN(len) (((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK) |
483 | ||
0838aa7f | 484 | /* Released via destroy_conntrack() */ |
308ac914 DB |
485 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
486 | const struct nf_conntrack_zone *zone, | |
487 | gfp_t flags) | |
0838aa7f | 488 | { |
30322309 | 489 | struct nf_conn *tmpl, *p; |
0838aa7f | 490 | |
30322309 FW |
491 | if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) { |
492 | tmpl = kzalloc(sizeof(*tmpl) + NFCT_INFOMASK, flags); | |
493 | if (!tmpl) | |
494 | return NULL; | |
495 | ||
496 | p = tmpl; | |
497 | tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p); | |
498 | if (tmpl != p) { | |
499 | tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p); | |
500 | tmpl->proto.tmpl_padto = (char *)tmpl - (char *)p; | |
501 | } | |
502 | } else { | |
503 | tmpl = kzalloc(sizeof(*tmpl), flags); | |
504 | if (!tmpl) | |
505 | return NULL; | |
506 | } | |
0838aa7f PNA |
507 | |
508 | tmpl->status = IPS_TEMPLATE; | |
509 | write_pnet(&tmpl->ct_net, net); | |
6c8dee98 | 510 | nf_ct_zone_add(tmpl, zone); |
0838aa7f PNA |
511 | atomic_set(&tmpl->ct_general.use, 0); |
512 | ||
513 | return tmpl; | |
0838aa7f PNA |
514 | } |
515 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); | |
516 | ||
9cf94eab | 517 | void nf_ct_tmpl_free(struct nf_conn *tmpl) |
0838aa7f PNA |
518 | { |
519 | nf_ct_ext_destroy(tmpl); | |
520 | nf_ct_ext_free(tmpl); | |
30322309 FW |
521 | |
522 | if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) | |
523 | kfree((char *)tmpl - tmpl->proto.tmpl_padto); | |
524 | else | |
525 | kfree(tmpl); | |
0838aa7f | 526 | } |
9cf94eab | 527 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_free); |
0838aa7f | 528 | |
9fb9cbb1 YK |
529 | static void |
530 | destroy_conntrack(struct nf_conntrack *nfct) | |
531 | { | |
532 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
b3480fe0 | 533 | const struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 534 | |
0d53778e | 535 | pr_debug("destroy_conntrack(%p)\n", ct); |
44d6e2f2 | 536 | WARN_ON(atomic_read(&nfct->use) != 0); |
9fb9cbb1 | 537 | |
0838aa7f PNA |
538 | if (unlikely(nf_ct_is_template(ct))) { |
539 | nf_ct_tmpl_free(ct); | |
540 | return; | |
541 | } | |
dd2934a9 | 542 | l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct)); |
4b4ceb9d | 543 | if (l4proto->destroy) |
605dcad6 | 544 | l4proto->destroy(ct); |
9fb9cbb1 | 545 | |
ca7433df | 546 | local_bh_disable(); |
9fb9cbb1 YK |
547 | /* Expectations will have been removed in clean_from_lists, |
548 | * except TFTP can create an expectation on the first packet, | |
549 | * before connection is in the list, so we need to clean here, | |
ca7433df JDB |
550 | * too. |
551 | */ | |
c1d10adb | 552 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 553 | |
b7779d06 | 554 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
9fb9cbb1 | 555 | |
ca7433df | 556 | local_bh_enable(); |
9fb9cbb1 YK |
557 | |
558 | if (ct->master) | |
559 | nf_ct_put(ct->master); | |
560 | ||
0d53778e | 561 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
562 | nf_conntrack_free(ct); |
563 | } | |
564 | ||
02982c27 | 565 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 566 | { |
0d55af87 | 567 | struct net *net = nf_ct_net(ct); |
93bb0ceb | 568 | unsigned int hash, reply_hash; |
93bb0ceb | 569 | unsigned int sequence; |
9fb9cbb1 | 570 | |
9858a3ae | 571 | nf_ct_helper_destroy(ct); |
93bb0ceb JDB |
572 | |
573 | local_bh_disable(); | |
574 | do { | |
a3efd812 | 575 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 576 | hash = hash_conntrack(net, |
93bb0ceb | 577 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 578 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
579 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
580 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
581 | ||
9fb9cbb1 | 582 | clean_from_lists(ct); |
93bb0ceb JDB |
583 | nf_conntrack_double_unlock(hash, reply_hash); |
584 | ||
b7779d06 | 585 | nf_ct_add_to_dying_list(ct); |
93bb0ceb | 586 | |
93bb0ceb | 587 | local_bh_enable(); |
dd7669a9 | 588 | } |
dd7669a9 | 589 | |
02982c27 | 590 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 591 | { |
a992ca2a PNA |
592 | struct nf_conn_tstamp *tstamp; |
593 | ||
f330a7fd FW |
594 | if (test_and_set_bit(IPS_DYING_BIT, &ct->status)) |
595 | return false; | |
596 | ||
a992ca2a PNA |
597 | tstamp = nf_conn_tstamp_find(ct); |
598 | if (tstamp && tstamp->stop == 0) | |
d2de875c | 599 | tstamp->stop = ktime_get_real_ns(); |
dd7669a9 | 600 | |
9500507c FW |
601 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
602 | portid, report) < 0) { | |
f330a7fd FW |
603 | /* destroy event was not delivered. nf_ct_put will |
604 | * be done by event cache worker on redelivery. | |
605 | */ | |
dd7669a9 | 606 | nf_ct_delete_from_lists(ct); |
9500507c | 607 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
02982c27 | 608 | return false; |
dd7669a9 | 609 | } |
9500507c FW |
610 | |
611 | nf_conntrack_ecache_work(nf_ct_net(ct)); | |
dd7669a9 | 612 | nf_ct_delete_from_lists(ct); |
9fb9cbb1 | 613 | nf_ct_put(ct); |
02982c27 FW |
614 | return true; |
615 | } | |
616 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
617 | ||
c6825c09 AV |
618 | static inline bool |
619 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, | |
308ac914 | 620 | const struct nf_conntrack_tuple *tuple, |
e0c7d472 FW |
621 | const struct nf_conntrack_zone *zone, |
622 | const struct net *net) | |
c6825c09 AV |
623 | { |
624 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
625 | ||
626 | /* A conntrack can be recreated with the equal tuple, | |
627 | * so we need to check that the conntrack is confirmed | |
628 | */ | |
629 | return nf_ct_tuple_equal(tuple, &h->tuple) && | |
deedb590 | 630 | nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) && |
e0c7d472 FW |
631 | nf_ct_is_confirmed(ct) && |
632 | net_eq(net, nf_ct_net(ct)); | |
c6825c09 AV |
633 | } |
634 | ||
ed07d9a0 MP |
635 | static inline bool |
636 | nf_ct_match(const struct nf_conn *ct1, const struct nf_conn *ct2) | |
637 | { | |
638 | return nf_ct_tuple_equal(&ct1->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
639 | &ct2->tuplehash[IP_CT_DIR_ORIGINAL].tuple) && | |
640 | nf_ct_tuple_equal(&ct1->tuplehash[IP_CT_DIR_REPLY].tuple, | |
641 | &ct2->tuplehash[IP_CT_DIR_REPLY].tuple) && | |
642 | nf_ct_zone_equal(ct1, nf_ct_zone(ct2), IP_CT_DIR_ORIGINAL) && | |
643 | nf_ct_zone_equal(ct1, nf_ct_zone(ct2), IP_CT_DIR_REPLY) && | |
644 | net_eq(nf_ct_net(ct1), nf_ct_net(ct2)); | |
645 | } | |
646 | ||
f330a7fd FW |
647 | /* caller must hold rcu readlock and none of the nf_conntrack_locks */ |
648 | static void nf_ct_gc_expired(struct nf_conn *ct) | |
649 | { | |
650 | if (!atomic_inc_not_zero(&ct->ct_general.use)) | |
651 | return; | |
652 | ||
653 | if (nf_ct_should_gc(ct)) | |
654 | nf_ct_kill(ct); | |
655 | ||
656 | nf_ct_put(ct); | |
657 | } | |
658 | ||
ea781f19 ED |
659 | /* |
660 | * Warning : | |
661 | * - Caller must take a reference on returned object | |
662 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
ea781f19 | 663 | */ |
99f07e91 | 664 | static struct nf_conntrack_tuple_hash * |
308ac914 | 665 | ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 666 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
667 | { |
668 | struct nf_conntrack_tuple_hash *h; | |
5e3c61f9 | 669 | struct hlist_nulls_head *ct_hash; |
ea781f19 | 670 | struct hlist_nulls_node *n; |
92e47ba8 | 671 | unsigned int bucket, hsize; |
9fb9cbb1 | 672 | |
ea781f19 | 673 | begin: |
92e47ba8 LZ |
674 | nf_conntrack_get_ht(&ct_hash, &hsize); |
675 | bucket = reciprocal_scale(hash, hsize); | |
5e3c61f9 FW |
676 | |
677 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) { | |
f330a7fd FW |
678 | struct nf_conn *ct; |
679 | ||
680 | ct = nf_ct_tuplehash_to_ctrack(h); | |
681 | if (nf_ct_is_expired(ct)) { | |
682 | nf_ct_gc_expired(ct); | |
683 | continue; | |
684 | } | |
685 | ||
686 | if (nf_ct_is_dying(ct)) | |
687 | continue; | |
688 | ||
8e8118f8 | 689 | if (nf_ct_key_equal(h, tuple, zone, net)) |
9fb9cbb1 | 690 | return h; |
9fb9cbb1 | 691 | } |
ea781f19 ED |
692 | /* |
693 | * if the nulls value we got at the end of this lookup is | |
694 | * not the expected one, we must restart lookup. | |
695 | * We probably met an item that was moved to another chain. | |
696 | */ | |
99f07e91 | 697 | if (get_nulls_value(n) != bucket) { |
2cf12348 | 698 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
ea781f19 | 699 | goto begin; |
af740b2c | 700 | } |
9fb9cbb1 YK |
701 | |
702 | return NULL; | |
703 | } | |
99f07e91 | 704 | |
9fb9cbb1 | 705 | /* Find a connection corresponding to a tuple. */ |
99f07e91 | 706 | static struct nf_conntrack_tuple_hash * |
308ac914 | 707 | __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 | 708 | const struct nf_conntrack_tuple *tuple, u32 hash) |
9fb9cbb1 YK |
709 | { |
710 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 711 | struct nf_conn *ct; |
9fb9cbb1 | 712 | |
76507f69 | 713 | rcu_read_lock(); |
ea781f19 | 714 | begin: |
99f07e91 | 715 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
716 | if (h) { |
717 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
718 | if (unlikely(nf_ct_is_dying(ct) || |
719 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 720 | h = NULL; |
ea781f19 | 721 | else { |
e0c7d472 | 722 | if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) { |
ea781f19 ED |
723 | nf_ct_put(ct); |
724 | goto begin; | |
725 | } | |
726 | } | |
76507f69 PM |
727 | } |
728 | rcu_read_unlock(); | |
9fb9cbb1 YK |
729 | |
730 | return h; | |
731 | } | |
99f07e91 CG |
732 | |
733 | struct nf_conntrack_tuple_hash * | |
308ac914 | 734 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
99f07e91 CG |
735 | const struct nf_conntrack_tuple *tuple) |
736 | { | |
737 | return __nf_conntrack_find_get(net, zone, tuple, | |
1b8c8a9f | 738 | hash_conntrack_raw(tuple, net)); |
99f07e91 | 739 | } |
13b18339 | 740 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 741 | |
c1d10adb PNA |
742 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
743 | unsigned int hash, | |
b476b72a | 744 | unsigned int reply_hash) |
c1d10adb | 745 | { |
ea781f19 | 746 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
56d52d48 | 747 | &nf_conntrack_hash[hash]); |
ea781f19 | 748 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
56d52d48 | 749 | &nf_conntrack_hash[reply_hash]); |
c1d10adb PNA |
750 | } |
751 | ||
7d367e06 JK |
752 | int |
753 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 754 | { |
308ac914 | 755 | const struct nf_conntrack_zone *zone; |
d696c7bd | 756 | struct net *net = nf_ct_net(ct); |
b476b72a | 757 | unsigned int hash, reply_hash; |
7d367e06 JK |
758 | struct nf_conntrack_tuple_hash *h; |
759 | struct hlist_nulls_node *n; | |
93bb0ceb | 760 | unsigned int sequence; |
c1d10adb | 761 | |
5d0aa2cc | 762 | zone = nf_ct_zone(ct); |
7d367e06 | 763 | |
93bb0ceb JDB |
764 | local_bh_disable(); |
765 | do { | |
a3efd812 | 766 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
deedb590 | 767 | hash = hash_conntrack(net, |
93bb0ceb | 768 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
deedb590 | 769 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
770 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
771 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
7d367e06 JK |
772 | |
773 | /* See if there's one in the list already, including reverse */ | |
56d52d48 | 774 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 775 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 776 | zone, net)) |
7d367e06 | 777 | goto out; |
86804348 | 778 | |
56d52d48 | 779 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 780 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 781 | zone, net)) |
7d367e06 | 782 | goto out; |
c1d10adb | 783 | |
e53376be PNA |
784 | smp_wmb(); |
785 | /* The caller holds a reference to this object */ | |
786 | atomic_set(&ct->ct_general.use, 2); | |
b476b72a | 787 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 788 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 789 | NF_CT_STAT_INC(net, insert); |
93bb0ceb | 790 | local_bh_enable(); |
7d367e06 JK |
791 | return 0; |
792 | ||
793 | out: | |
93bb0ceb | 794 | nf_conntrack_double_unlock(hash, reply_hash); |
7d367e06 | 795 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 796 | local_bh_enable(); |
7d367e06 | 797 | return -EEXIST; |
c1d10adb | 798 | } |
7d367e06 | 799 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 800 | |
ba76738c PNA |
801 | static inline void nf_ct_acct_update(struct nf_conn *ct, |
802 | enum ip_conntrack_info ctinfo, | |
803 | unsigned int len) | |
804 | { | |
805 | struct nf_conn_acct *acct; | |
806 | ||
807 | acct = nf_conn_acct_find(ct); | |
808 | if (acct) { | |
809 | struct nf_conn_counter *counter = acct->counter; | |
810 | ||
811 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); | |
812 | atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes); | |
813 | } | |
814 | } | |
815 | ||
71d8c47f PNA |
816 | static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
817 | const struct nf_conn *loser_ct) | |
818 | { | |
819 | struct nf_conn_acct *acct; | |
820 | ||
821 | acct = nf_conn_acct_find(loser_ct); | |
822 | if (acct) { | |
823 | struct nf_conn_counter *counter = acct->counter; | |
71d8c47f PNA |
824 | unsigned int bytes; |
825 | ||
826 | /* u32 should be fine since we must have seen one packet. */ | |
827 | bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes); | |
828 | nf_ct_acct_update(ct, ctinfo, bytes); | |
829 | } | |
830 | } | |
831 | ||
832 | /* Resolve race on insertion if this protocol allows this. */ | |
833 | static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb, | |
834 | enum ip_conntrack_info ctinfo, | |
835 | struct nf_conntrack_tuple_hash *h) | |
836 | { | |
837 | /* This is the conntrack entry already in hashes that won race. */ | |
838 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
b3480fe0 | 839 | const struct nf_conntrack_l4proto *l4proto; |
ed07d9a0 MP |
840 | enum ip_conntrack_info oldinfo; |
841 | struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo); | |
71d8c47f | 842 | |
dd2934a9 | 843 | l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct)); |
71d8c47f PNA |
844 | if (l4proto->allow_clash && |
845 | !nf_ct_is_dying(ct) && | |
846 | atomic_inc_not_zero(&ct->ct_general.use)) { | |
ed07d9a0 MP |
847 | if (((ct->status & IPS_NAT_DONE_MASK) == 0) || |
848 | nf_ct_match(ct, loser_ct)) { | |
849 | nf_ct_acct_merge(ct, ctinfo, loser_ct); | |
850 | nf_conntrack_put(&loser_ct->ct_general); | |
851 | nf_ct_set(skb, ct, oldinfo); | |
852 | return NF_ACCEPT; | |
853 | } | |
854 | nf_ct_put(ct); | |
71d8c47f PNA |
855 | } |
856 | NF_CT_STAT_INC(net, drop); | |
857 | return NF_DROP; | |
858 | } | |
859 | ||
9fb9cbb1 YK |
860 | /* Confirm a connection given skb; places it in hash table */ |
861 | int | |
3db05fea | 862 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 | 863 | { |
308ac914 | 864 | const struct nf_conntrack_zone *zone; |
b476b72a | 865 | unsigned int hash, reply_hash; |
df0933dc | 866 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 867 | struct nf_conn *ct; |
df0933dc | 868 | struct nf_conn_help *help; |
a992ca2a | 869 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 870 | struct hlist_nulls_node *n; |
9fb9cbb1 | 871 | enum ip_conntrack_info ctinfo; |
400dad39 | 872 | struct net *net; |
93bb0ceb | 873 | unsigned int sequence; |
71d8c47f | 874 | int ret = NF_DROP; |
9fb9cbb1 | 875 | |
3db05fea | 876 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 877 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
878 | |
879 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
880 | ICMP/TCP RST packets in other direction. Actual packet | |
881 | which created connection will be IP_CT_NEW or for an | |
882 | expected connection, IP_CT_RELATED. */ | |
883 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
884 | return NF_ACCEPT; | |
885 | ||
5d0aa2cc | 886 | zone = nf_ct_zone(ct); |
93bb0ceb JDB |
887 | local_bh_disable(); |
888 | ||
889 | do { | |
a3efd812 | 890 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb JDB |
891 | /* reuse the hash saved before */ |
892 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
56d52d48 | 893 | hash = scale_hash(hash); |
deedb590 | 894 | reply_hash = hash_conntrack(net, |
93bb0ceb JDB |
895 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
896 | ||
897 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); | |
9fb9cbb1 YK |
898 | |
899 | /* We're not in hash table, and we refuse to set up related | |
93bb0ceb JDB |
900 | * connections for unconfirmed conns. But packet copies and |
901 | * REJECT will give spurious warnings here. | |
902 | */ | |
9fb9cbb1 | 903 | |
25985edc | 904 | /* No external references means no one else could have |
93bb0ceb JDB |
905 | * confirmed us. |
906 | */ | |
44d6e2f2 | 907 | WARN_ON(nf_ct_is_confirmed(ct)); |
0d53778e | 908 | pr_debug("Confirming conntrack %p\n", ct); |
8ca3f5e9 PNA |
909 | /* We have to check the DYING flag after unlink to prevent |
910 | * a race against nf_ct_get_next_corpse() possibly called from | |
911 | * user context, else we insert an already 'dead' hash, blocking | |
912 | * further use of that particular connection -JM. | |
913 | */ | |
914 | nf_ct_del_from_dying_or_unconfirmed_list(ct); | |
915 | ||
71d8c47f PNA |
916 | if (unlikely(nf_ct_is_dying(ct))) { |
917 | nf_ct_add_to_dying_list(ct); | |
918 | goto dying; | |
919 | } | |
fc350777 | 920 | |
9fb9cbb1 YK |
921 | /* See if there's one in the list already, including reverse: |
922 | NAT could have grabbed it without realizing, since we're | |
923 | not in the hash. If there is, we lost race. */ | |
56d52d48 | 924 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
86804348 | 925 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
e0c7d472 | 926 | zone, net)) |
df0933dc | 927 | goto out; |
86804348 | 928 | |
56d52d48 | 929 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
86804348 | 930 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
e0c7d472 | 931 | zone, net)) |
df0933dc | 932 | goto out; |
9fb9cbb1 | 933 | |
df0933dc PM |
934 | /* Timer relative to confirmation time, not original |
935 | setting time, otherwise we'd get timer wrap in | |
936 | weird delay cases. */ | |
f330a7fd | 937 | ct->timeout += nfct_time_stamp; |
df0933dc | 938 | atomic_inc(&ct->ct_general.use); |
45eec341 | 939 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 940 | |
a992ca2a PNA |
941 | /* set conntrack timestamp, if enabled. */ |
942 | tstamp = nf_conn_tstamp_find(ct); | |
943 | if (tstamp) { | |
2456e855 | 944 | if (skb->tstamp == 0) |
e3192690 | 945 | __net_timestamp(skb); |
a992ca2a PNA |
946 | |
947 | tstamp->start = ktime_to_ns(skb->tstamp); | |
948 | } | |
5c8ec910 PM |
949 | /* Since the lookup is lockless, hash insertion must be done after |
950 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
951 | * guarantee that no other CPU can find the conntrack before the above | |
952 | * stores are visible. | |
953 | */ | |
b476b72a | 954 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
93bb0ceb | 955 | nf_conntrack_double_unlock(hash, reply_hash); |
93bb0ceb | 956 | local_bh_enable(); |
5c8ec910 | 957 | |
df0933dc PM |
958 | help = nfct_help(ct); |
959 | if (help && help->helper) | |
a71996fc | 960 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 961 | |
df0933dc | 962 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 963 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 964 | return NF_ACCEPT; |
9fb9cbb1 | 965 | |
df0933dc | 966 | out: |
8ca3f5e9 | 967 | nf_ct_add_to_dying_list(ct); |
71d8c47f PNA |
968 | ret = nf_ct_resolve_clash(net, skb, ctinfo, h); |
969 | dying: | |
93bb0ceb | 970 | nf_conntrack_double_unlock(hash, reply_hash); |
0d55af87 | 971 | NF_CT_STAT_INC(net, insert_failed); |
93bb0ceb | 972 | local_bh_enable(); |
71d8c47f | 973 | return ret; |
9fb9cbb1 | 974 | } |
13b18339 | 975 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
976 | |
977 | /* Returns true if a connection correspondings to the tuple (required | |
978 | for NAT). */ | |
979 | int | |
980 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
981 | const struct nf_conn *ignored_conntrack) | |
982 | { | |
400dad39 | 983 | struct net *net = nf_ct_net(ignored_conntrack); |
308ac914 | 984 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 | 985 | struct nf_conntrack_tuple_hash *h; |
5e3c61f9 | 986 | struct hlist_nulls_head *ct_hash; |
92e47ba8 | 987 | unsigned int hash, hsize; |
ea781f19 | 988 | struct hlist_nulls_node *n; |
5d0aa2cc | 989 | struct nf_conn *ct; |
308ac914 DB |
990 | |
991 | zone = nf_ct_zone(ignored_conntrack); | |
9fb9cbb1 | 992 | |
2cf12348 | 993 | rcu_read_lock(); |
95a8d19f | 994 | begin: |
92e47ba8 LZ |
995 | nf_conntrack_get_ht(&ct_hash, &hsize); |
996 | hash = __hash_conntrack(net, tuple, hsize); | |
5e3c61f9 FW |
997 | |
998 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) { | |
5d0aa2cc | 999 | ct = nf_ct_tuplehash_to_ctrack(h); |
f330a7fd FW |
1000 | |
1001 | if (ct == ignored_conntrack) | |
1002 | continue; | |
1003 | ||
1004 | if (nf_ct_is_expired(ct)) { | |
1005 | nf_ct_gc_expired(ct); | |
1006 | continue; | |
1007 | } | |
1008 | ||
1009 | if (nf_ct_key_equal(h, tuple, zone, net)) { | |
2cf12348 FW |
1010 | NF_CT_STAT_INC_ATOMIC(net, found); |
1011 | rcu_read_unlock(); | |
ba419aff PM |
1012 | return 1; |
1013 | } | |
ba419aff | 1014 | } |
95a8d19f FW |
1015 | |
1016 | if (get_nulls_value(n) != hash) { | |
1017 | NF_CT_STAT_INC_ATOMIC(net, search_restart); | |
1018 | goto begin; | |
1019 | } | |
1020 | ||
2cf12348 | 1021 | rcu_read_unlock(); |
9fb9cbb1 | 1022 | |
ba419aff | 1023 | return 0; |
9fb9cbb1 | 1024 | } |
13b18339 | 1025 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 1026 | |
7ae7730f PM |
1027 | #define NF_CT_EVICTION_RANGE 8 |
1028 | ||
9fb9cbb1 YK |
1029 | /* There's a small race here where we may free a just-assured |
1030 | connection. Too bad: we're in trouble anyway. */ | |
242922a0 FW |
1031 | static unsigned int early_drop_list(struct net *net, |
1032 | struct hlist_nulls_head *head) | |
9fb9cbb1 | 1033 | { |
9fb9cbb1 | 1034 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 1035 | struct hlist_nulls_node *n; |
242922a0 FW |
1036 | unsigned int drops = 0; |
1037 | struct nf_conn *tmp; | |
3e86638e | 1038 | |
242922a0 FW |
1039 | hlist_nulls_for_each_entry_rcu(h, n, head, hnnode) { |
1040 | tmp = nf_ct_tuplehash_to_ctrack(h); | |
9fb9cbb1 | 1041 | |
90964016 PNA |
1042 | if (test_bit(IPS_OFFLOAD_BIT, &tmp->status)) |
1043 | continue; | |
1044 | ||
f330a7fd FW |
1045 | if (nf_ct_is_expired(tmp)) { |
1046 | nf_ct_gc_expired(tmp); | |
1047 | continue; | |
1048 | } | |
1049 | ||
242922a0 FW |
1050 | if (test_bit(IPS_ASSURED_BIT, &tmp->status) || |
1051 | !net_eq(nf_ct_net(tmp), net) || | |
1052 | nf_ct_is_dying(tmp)) | |
1053 | continue; | |
76507f69 | 1054 | |
242922a0 FW |
1055 | if (!atomic_inc_not_zero(&tmp->ct_general.use)) |
1056 | continue; | |
76507f69 | 1057 | |
242922a0 | 1058 | /* kill only if still in same netns -- might have moved due to |
5f0d5a3a | 1059 | * SLAB_TYPESAFE_BY_RCU rules. |
242922a0 FW |
1060 | * |
1061 | * We steal the timer reference. If that fails timer has | |
1062 | * already fired or someone else deleted it. Just drop ref | |
1063 | * and move to next entry. | |
1064 | */ | |
1065 | if (net_eq(nf_ct_net(tmp), net) && | |
1066 | nf_ct_is_confirmed(tmp) && | |
242922a0 FW |
1067 | nf_ct_delete(tmp, 0, 0)) |
1068 | drops++; | |
1069 | ||
1070 | nf_ct_put(tmp); | |
9fb9cbb1 | 1071 | } |
3e86638e | 1072 | |
242922a0 FW |
1073 | return drops; |
1074 | } | |
9fb9cbb1 | 1075 | |
f393808d | 1076 | static noinline int early_drop(struct net *net, unsigned int hash) |
242922a0 | 1077 | { |
f393808d | 1078 | unsigned int i, bucket; |
9fb9cbb1 | 1079 | |
242922a0 FW |
1080 | for (i = 0; i < NF_CT_EVICTION_RANGE; i++) { |
1081 | struct hlist_nulls_head *ct_hash; | |
f393808d | 1082 | unsigned int hsize, drops; |
242922a0 | 1083 | |
3101e0fc | 1084 | rcu_read_lock(); |
92e47ba8 | 1085 | nf_conntrack_get_ht(&ct_hash, &hsize); |
f393808d VK |
1086 | if (!i) |
1087 | bucket = reciprocal_scale(hash, hsize); | |
1088 | else | |
1089 | bucket = (bucket + 1) % hsize; | |
242922a0 | 1090 | |
f393808d | 1091 | drops = early_drop_list(net, &ct_hash[bucket]); |
3101e0fc LZ |
1092 | rcu_read_unlock(); |
1093 | ||
242922a0 FW |
1094 | if (drops) { |
1095 | NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); | |
1096 | return true; | |
74138511 | 1097 | } |
9fb9cbb1 | 1098 | } |
3e86638e | 1099 | |
242922a0 | 1100 | return false; |
9fb9cbb1 YK |
1101 | } |
1102 | ||
c6dd940b FW |
1103 | static bool gc_worker_skip_ct(const struct nf_conn *ct) |
1104 | { | |
1105 | return !nf_ct_is_confirmed(ct) || nf_ct_is_dying(ct); | |
1106 | } | |
1107 | ||
1108 | static bool gc_worker_can_early_drop(const struct nf_conn *ct) | |
1109 | { | |
1110 | const struct nf_conntrack_l4proto *l4proto; | |
1111 | ||
1112 | if (!test_bit(IPS_ASSURED_BIT, &ct->status)) | |
1113 | return true; | |
1114 | ||
dd2934a9 | 1115 | l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct)); |
c6dd940b FW |
1116 | if (l4proto->can_early_drop && l4proto->can_early_drop(ct)) |
1117 | return true; | |
1118 | ||
1119 | return false; | |
1120 | } | |
1121 | ||
90964016 PNA |
1122 | #define DAY (86400 * HZ) |
1123 | ||
1124 | /* Set an arbitrary timeout large enough not to ever expire, this save | |
1125 | * us a check for the IPS_OFFLOAD_BIT from the packet path via | |
1126 | * nf_ct_is_expired(). | |
1127 | */ | |
1128 | static void nf_ct_offload_timeout(struct nf_conn *ct) | |
1129 | { | |
1130 | if (nf_ct_expires(ct) < DAY / 2) | |
1131 | ct->timeout = nfct_time_stamp + DAY; | |
1132 | } | |
1133 | ||
b87a2f91 FW |
1134 | static void gc_worker(struct work_struct *work) |
1135 | { | |
e5072053 | 1136 | unsigned int min_interval = max(HZ / GC_MAX_BUCKETS_DIV, 1u); |
b87a2f91 | 1137 | unsigned int i, goal, buckets = 0, expired_count = 0; |
c6dd940b | 1138 | unsigned int nf_conntrack_max95 = 0; |
b87a2f91 | 1139 | struct conntrack_gc_work *gc_work; |
e0df8cae FW |
1140 | unsigned int ratio, scanned = 0; |
1141 | unsigned long next_run; | |
b87a2f91 FW |
1142 | |
1143 | gc_work = container_of(work, struct conntrack_gc_work, dwork.work); | |
1144 | ||
e0df8cae | 1145 | goal = nf_conntrack_htable_size / GC_MAX_BUCKETS_DIV; |
b87a2f91 | 1146 | i = gc_work->last_bucket; |
c6dd940b FW |
1147 | if (gc_work->early_drop) |
1148 | nf_conntrack_max95 = nf_conntrack_max / 100u * 95u; | |
b87a2f91 FW |
1149 | |
1150 | do { | |
1151 | struct nf_conntrack_tuple_hash *h; | |
1152 | struct hlist_nulls_head *ct_hash; | |
1153 | struct hlist_nulls_node *n; | |
1154 | unsigned int hashsz; | |
1155 | struct nf_conn *tmp; | |
1156 | ||
1157 | i++; | |
1158 | rcu_read_lock(); | |
1159 | ||
1160 | nf_conntrack_get_ht(&ct_hash, &hashsz); | |
1161 | if (i >= hashsz) | |
1162 | i = 0; | |
1163 | ||
1164 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { | |
c6dd940b FW |
1165 | struct net *net; |
1166 | ||
b87a2f91 FW |
1167 | tmp = nf_ct_tuplehash_to_ctrack(h); |
1168 | ||
c023c0e4 | 1169 | scanned++; |
90964016 PNA |
1170 | if (test_bit(IPS_OFFLOAD_BIT, &tmp->status)) { |
1171 | nf_ct_offload_timeout(tmp); | |
1172 | continue; | |
1173 | } | |
1174 | ||
b87a2f91 FW |
1175 | if (nf_ct_is_expired(tmp)) { |
1176 | nf_ct_gc_expired(tmp); | |
1177 | expired_count++; | |
1178 | continue; | |
1179 | } | |
c6dd940b FW |
1180 | |
1181 | if (nf_conntrack_max95 == 0 || gc_worker_skip_ct(tmp)) | |
1182 | continue; | |
1183 | ||
1184 | net = nf_ct_net(tmp); | |
1185 | if (atomic_read(&net->ct.count) < nf_conntrack_max95) | |
1186 | continue; | |
1187 | ||
1188 | /* need to take reference to avoid possible races */ | |
1189 | if (!atomic_inc_not_zero(&tmp->ct_general.use)) | |
1190 | continue; | |
1191 | ||
1192 | if (gc_worker_skip_ct(tmp)) { | |
1193 | nf_ct_put(tmp); | |
1194 | continue; | |
1195 | } | |
1196 | ||
1197 | if (gc_worker_can_early_drop(tmp)) | |
1198 | nf_ct_kill(tmp); | |
1199 | ||
1200 | nf_ct_put(tmp); | |
b87a2f91 FW |
1201 | } |
1202 | ||
1203 | /* could check get_nulls_value() here and restart if ct | |
1204 | * was moved to another chain. But given gc is best-effort | |
1205 | * we will just continue with next hash slot. | |
1206 | */ | |
1207 | rcu_read_unlock(); | |
ffa53c58 | 1208 | cond_resched(); |
524b698d | 1209 | } while (++buckets < goal); |
b87a2f91 FW |
1210 | |
1211 | if (gc_work->exiting) | |
1212 | return; | |
1213 | ||
e0df8cae FW |
1214 | /* |
1215 | * Eviction will normally happen from the packet path, and not | |
1216 | * from this gc worker. | |
1217 | * | |
1218 | * This worker is only here to reap expired entries when system went | |
1219 | * idle after a busy period. | |
1220 | * | |
1221 | * The heuristics below are supposed to balance conflicting goals: | |
1222 | * | |
1223 | * 1. Minimize time until we notice a stale entry | |
1224 | * 2. Maximize scan intervals to not waste cycles | |
1225 | * | |
e5072053 | 1226 | * Normally, expire ratio will be close to 0. |
e0df8cae | 1227 | * |
e5072053 FW |
1228 | * As soon as a sizeable fraction of the entries have expired |
1229 | * increase scan frequency. | |
e0df8cae | 1230 | */ |
c023c0e4 | 1231 | ratio = scanned ? expired_count * 100 / scanned : 0; |
e5072053 FW |
1232 | if (ratio > GC_EVICT_RATIO) { |
1233 | gc_work->next_gc_run = min_interval; | |
e0df8cae | 1234 | } else { |
e5072053 | 1235 | unsigned int max = GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV; |
e0df8cae | 1236 | |
e5072053 FW |
1237 | BUILD_BUG_ON((GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV) == 0); |
1238 | ||
1239 | gc_work->next_gc_run += min_interval; | |
1240 | if (gc_work->next_gc_run > max) | |
1241 | gc_work->next_gc_run = max; | |
e0df8cae | 1242 | } |
c023c0e4 | 1243 | |
e5072053 | 1244 | next_run = gc_work->next_gc_run; |
b87a2f91 | 1245 | gc_work->last_bucket = i; |
c6dd940b | 1246 | gc_work->early_drop = false; |
0984d427 | 1247 | queue_delayed_work(system_power_efficient_wq, &gc_work->dwork, next_run); |
b87a2f91 FW |
1248 | } |
1249 | ||
1250 | static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work) | |
1251 | { | |
a232cd0e | 1252 | INIT_DEFERRABLE_WORK(&gc_work->dwork, gc_worker); |
e5072053 | 1253 | gc_work->next_gc_run = HZ; |
b87a2f91 FW |
1254 | gc_work->exiting = false; |
1255 | } | |
1256 | ||
99f07e91 | 1257 | static struct nf_conn * |
308ac914 DB |
1258 | __nf_conntrack_alloc(struct net *net, |
1259 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1260 | const struct nf_conntrack_tuple *orig, |
1261 | const struct nf_conntrack_tuple *repl, | |
1262 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 1263 | { |
cd7fcbf1 | 1264 | struct nf_conn *ct; |
9fb9cbb1 | 1265 | |
5251e2d2 | 1266 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 1267 | atomic_inc(&net->ct.count); |
5251e2d2 | 1268 | |
76eb9460 | 1269 | if (nf_conntrack_max && |
49ac8713 | 1270 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
93bb0ceb | 1271 | if (!early_drop(net, hash)) { |
c6dd940b FW |
1272 | if (!conntrack_gc_work.early_drop) |
1273 | conntrack_gc_work.early_drop = true; | |
49ac8713 | 1274 | atomic_dec(&net->ct.count); |
e87cc472 | 1275 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
1276 | return ERR_PTR(-ENOMEM); |
1277 | } | |
1278 | } | |
1279 | ||
941297f4 ED |
1280 | /* |
1281 | * Do not use kmem_cache_zalloc(), as this cache uses | |
5f0d5a3a | 1282 | * SLAB_TYPESAFE_BY_RCU. |
941297f4 | 1283 | */ |
0c5366b3 | 1284 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); |
5e8018fc DB |
1285 | if (ct == NULL) |
1286 | goto out; | |
1287 | ||
440f0d58 | 1288 | spin_lock_init(&ct->lock); |
c88130bc | 1289 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 1290 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 1291 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
1292 | /* save hash for reusing when confirming */ |
1293 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
c41884ce | 1294 | ct->status = 0; |
c2d9ba9b | 1295 | write_pnet(&ct->ct_net, net); |
c41884ce FW |
1296 | memset(&ct->__nfct_init_offset[0], 0, |
1297 | offsetof(struct nf_conn, proto) - | |
1298 | offsetof(struct nf_conn, __nfct_init_offset[0])); | |
5e8018fc | 1299 | |
6c8dee98 | 1300 | nf_ct_zone_add(ct, zone); |
5e8018fc | 1301 | |
e53376be PNA |
1302 | /* Because we use RCU lookups, we set ct_general.use to zero before |
1303 | * this is inserted in any list. | |
941297f4 | 1304 | */ |
e53376be | 1305 | atomic_set(&ct->ct_general.use, 0); |
c88130bc | 1306 | return ct; |
5e8018fc DB |
1307 | out: |
1308 | atomic_dec(&net->ct.count); | |
5d0aa2cc | 1309 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 1310 | } |
99f07e91 | 1311 | |
308ac914 DB |
1312 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
1313 | const struct nf_conntrack_zone *zone, | |
99f07e91 CG |
1314 | const struct nf_conntrack_tuple *orig, |
1315 | const struct nf_conntrack_tuple *repl, | |
1316 | gfp_t gfp) | |
1317 | { | |
1318 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
1319 | } | |
13b18339 | 1320 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 1321 | |
c88130bc | 1322 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 1323 | { |
1d45209d ED |
1324 | struct net *net = nf_ct_net(ct); |
1325 | ||
e53376be | 1326 | /* A freed object has refcnt == 0, that's |
5f0d5a3a | 1327 | * the golden rule for SLAB_TYPESAFE_BY_RCU |
e53376be | 1328 | */ |
44d6e2f2 | 1329 | WARN_ON(atomic_read(&ct->ct_general.use) != 0); |
e53376be | 1330 | |
ceeff754 | 1331 | nf_ct_ext_destroy(ct); |
ea781f19 | 1332 | nf_ct_ext_free(ct); |
0c5366b3 | 1333 | kmem_cache_free(nf_conntrack_cachep, ct); |
4e857c58 | 1334 | smp_mb__before_atomic(); |
0c3c6c00 | 1335 | atomic_dec(&net->ct.count); |
76507f69 | 1336 | } |
13b18339 | 1337 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 1338 | |
c539f017 | 1339 | |
9fb9cbb1 YK |
1340 | /* Allocate a new conntrack: we return -ENOMEM if classification |
1341 | failed due to stress. Otherwise it really is unclassifiable. */ | |
fc09e4a7 | 1342 | static noinline struct nf_conntrack_tuple_hash * |
b2a15a60 | 1343 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 1344 | const struct nf_conntrack_tuple *tuple, |
2a04aabf | 1345 | const struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 1346 | struct sk_buff *skb, |
60b5f8f7 | 1347 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 1348 | { |
c88130bc | 1349 | struct nf_conn *ct; |
3c158f7f | 1350 | struct nf_conn_help *help; |
9fb9cbb1 | 1351 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 1352 | struct nf_conntrack_ecache *ecache; |
ca7433df | 1353 | struct nf_conntrack_expect *exp = NULL; |
308ac914 | 1354 | const struct nf_conntrack_zone *zone; |
60b5f8f7 | 1355 | struct nf_conn_timeout *timeout_ext; |
5e8018fc | 1356 | struct nf_conntrack_zone tmp; |
9fb9cbb1 | 1357 | |
d1b6fe94 | 1358 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l4proto)) { |
0d53778e | 1359 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
1360 | return NULL; |
1361 | } | |
1362 | ||
5e8018fc | 1363 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
99f07e91 CG |
1364 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
1365 | hash); | |
0a9ee813 | 1366 | if (IS_ERR(ct)) |
c88130bc | 1367 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 1368 | |
4440a2ab GF |
1369 | if (!nf_ct_add_synproxy(ct, tmpl)) { |
1370 | nf_conntrack_free(ct); | |
1371 | return ERR_PTR(-ENOMEM); | |
48b1de4c PM |
1372 | } |
1373 | ||
60b5f8f7 | 1374 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
60b5f8f7 | 1375 | |
60b5f8f7 | 1376 | if (timeout_ext) |
ae2d708e PNA |
1377 | nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout), |
1378 | GFP_ATOMIC); | |
60b5f8f7 | 1379 | |
58401572 | 1380 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 1381 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 1382 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
1383 | |
1384 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
1385 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
1386 | ecache ? ecache->expmask : 0, | |
1387 | GFP_ATOMIC); | |
58401572 | 1388 | |
ca7433df JDB |
1389 | local_bh_disable(); |
1390 | if (net->ct.expect_count) { | |
1391 | spin_lock(&nf_conntrack_expect_lock); | |
1392 | exp = nf_ct_find_expectation(net, zone, tuple); | |
1393 | if (exp) { | |
ccd63c20 | 1394 | pr_debug("expectation arrives ct=%p exp=%p\n", |
ca7433df JDB |
1395 | ct, exp); |
1396 | /* Welcome, Mr. Bond. We've been expecting you... */ | |
1397 | __set_bit(IPS_EXPECTED_BIT, &ct->status); | |
1398 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ | |
1399 | ct->master = exp->master; | |
1400 | if (exp->helper) { | |
440534d3 | 1401 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ca7433df JDB |
1402 | if (help) |
1403 | rcu_assign_pointer(help->helper, exp->helper); | |
1404 | } | |
ceceae1b | 1405 | |
9fb9cbb1 | 1406 | #ifdef CONFIG_NF_CONNTRACK_MARK |
ca7433df | 1407 | ct->mark = exp->master->mark; |
7c9728c3 JM |
1408 | #endif |
1409 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
ca7433df | 1410 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 1411 | #endif |
ca7433df JDB |
1412 | NF_CT_STAT_INC(net, expect_new); |
1413 | } | |
1414 | spin_unlock(&nf_conntrack_expect_lock); | |
1415 | } | |
8e8118f8 | 1416 | if (!exp) |
b2a15a60 | 1417 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
9fb9cbb1 | 1418 | |
e53376be PNA |
1419 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
1420 | nf_conntrack_get(&ct->ct_general); | |
b7779d06 | 1421 | nf_ct_add_to_unconfirmed_list(ct); |
9fb9cbb1 | 1422 | |
ca7433df | 1423 | local_bh_enable(); |
9fb9cbb1 YK |
1424 | |
1425 | if (exp) { | |
1426 | if (exp->expectfn) | |
c88130bc | 1427 | exp->expectfn(ct, exp); |
6823645d | 1428 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
1429 | } |
1430 | ||
c88130bc | 1431 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
1432 | } |
1433 | ||
fc09e4a7 FW |
1434 | /* On success, returns 0, sets skb->_nfct | ctinfo */ |
1435 | static int | |
93e66024 | 1436 | resolve_normal_ct(struct nf_conn *tmpl, |
a702a65f | 1437 | struct sk_buff *skb, |
9fb9cbb1 | 1438 | unsigned int dataoff, |
9fb9cbb1 | 1439 | u_int8_t protonum, |
93e66024 FW |
1440 | const struct nf_conntrack_l4proto *l4proto, |
1441 | const struct nf_hook_state *state) | |
9fb9cbb1 | 1442 | { |
308ac914 | 1443 | const struct nf_conntrack_zone *zone; |
9fb9cbb1 YK |
1444 | struct nf_conntrack_tuple tuple; |
1445 | struct nf_conntrack_tuple_hash *h; | |
fc09e4a7 | 1446 | enum ip_conntrack_info ctinfo; |
5e8018fc | 1447 | struct nf_conntrack_zone tmp; |
9fb9cbb1 | 1448 | struct nf_conn *ct; |
99f07e91 | 1449 | u32 hash; |
9fb9cbb1 | 1450 | |
bbe735e4 | 1451 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
93e66024 FW |
1452 | dataoff, state->pf, protonum, state->net, |
1453 | &tuple, l4proto)) { | |
ccd63c20 | 1454 | pr_debug("Can't get tuple\n"); |
fc09e4a7 | 1455 | return 0; |
9fb9cbb1 YK |
1456 | } |
1457 | ||
1458 | /* look for tuple match */ | |
5e8018fc | 1459 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
93e66024 FW |
1460 | hash = hash_conntrack_raw(&tuple, state->net); |
1461 | h = __nf_conntrack_find_get(state->net, zone, &tuple, hash); | |
9fb9cbb1 | 1462 | if (!h) { |
93e66024 | 1463 | h = init_conntrack(state->net, tmpl, &tuple, l4proto, |
60b5f8f7 | 1464 | skb, dataoff, hash); |
9fb9cbb1 | 1465 | if (!h) |
fc09e4a7 | 1466 | return 0; |
9fb9cbb1 | 1467 | if (IS_ERR(h)) |
fc09e4a7 | 1468 | return PTR_ERR(h); |
9fb9cbb1 YK |
1469 | } |
1470 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1471 | ||
1472 | /* It exists; we have (non-exclusive) reference. */ | |
1473 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fc09e4a7 | 1474 | ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
1475 | } else { |
1476 | /* Once we've had two way comms, always ESTABLISHED. */ | |
1477 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
ccd63c20 | 1478 | pr_debug("normal packet for %p\n", ct); |
fc09e4a7 | 1479 | ctinfo = IP_CT_ESTABLISHED; |
9fb9cbb1 | 1480 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
ccd63c20 | 1481 | pr_debug("related packet for %p\n", ct); |
fc09e4a7 | 1482 | ctinfo = IP_CT_RELATED; |
9fb9cbb1 | 1483 | } else { |
ccd63c20 | 1484 | pr_debug("new packet for %p\n", ct); |
fc09e4a7 | 1485 | ctinfo = IP_CT_NEW; |
9fb9cbb1 | 1486 | } |
9fb9cbb1 | 1487 | } |
fc09e4a7 FW |
1488 | nf_ct_set(skb, ct, ctinfo); |
1489 | return 0; | |
9fb9cbb1 YK |
1490 | } |
1491 | ||
6fe78fa4 FW |
1492 | /* |
1493 | * icmp packets need special treatment to handle error messages that are | |
1494 | * related to a connection. | |
1495 | * | |
1496 | * Callers need to check if skb has a conntrack assigned when this | |
1497 | * helper returns; in such case skb belongs to an already known connection. | |
1498 | */ | |
1499 | static unsigned int __cold | |
1500 | nf_conntrack_handle_icmp(struct nf_conn *tmpl, | |
1501 | struct sk_buff *skb, | |
1502 | unsigned int dataoff, | |
1503 | u8 protonum, | |
1504 | const struct nf_hook_state *state) | |
1505 | { | |
1506 | int ret; | |
1507 | ||
1508 | if (state->pf == NFPROTO_IPV4 && protonum == IPPROTO_ICMP) | |
1509 | ret = nf_conntrack_icmpv4_error(tmpl, skb, dataoff, state); | |
1510 | #if IS_ENABLED(CONFIG_IPV6) | |
1511 | else if (state->pf == NFPROTO_IPV6 && protonum == IPPROTO_ICMPV6) | |
1512 | ret = nf_conntrack_icmpv6_error(tmpl, skb, dataoff, state); | |
1513 | #endif | |
1514 | else | |
1515 | return NF_ACCEPT; | |
1516 | ||
1517 | if (ret <= 0) { | |
1518 | NF_CT_STAT_INC_ATOMIC(state->net, error); | |
1519 | NF_CT_STAT_INC_ATOMIC(state->net, invalid); | |
1520 | } | |
1521 | ||
1522 | return ret; | |
1523 | } | |
1524 | ||
9fb9cbb1 | 1525 | unsigned int |
93e66024 | 1526 | nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state) |
9fb9cbb1 | 1527 | { |
b3480fe0 | 1528 | const struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 1529 | enum ip_conntrack_info ctinfo; |
93e66024 | 1530 | struct nf_conn *ct, *tmpl; |
9fb9cbb1 | 1531 | u_int8_t protonum; |
6816d931 | 1532 | int dataoff, ret; |
9fb9cbb1 | 1533 | |
97a6ad13 | 1534 | tmpl = nf_ct_get(skb, &ctinfo); |
cc41c84b | 1535 | if (tmpl || ctinfo == IP_CT_UNTRACKED) { |
b2a15a60 | 1536 | /* Previously seen (loopback or untracked)? Ignore. */ |
cc41c84b FW |
1537 | if ((tmpl && !nf_ct_is_template(tmpl)) || |
1538 | ctinfo == IP_CT_UNTRACKED) { | |
93e66024 | 1539 | NF_CT_STAT_INC_ATOMIC(state->net, ignore); |
b2a15a60 PM |
1540 | return NF_ACCEPT; |
1541 | } | |
a9e419dc | 1542 | skb->_nfct = 0; |
9fb9cbb1 YK |
1543 | } |
1544 | ||
e2361cb9 | 1545 | /* rcu_read_lock()ed by nf_hook_thresh */ |
93e66024 | 1546 | dataoff = get_l4proto(skb, skb_network_offset(skb), state->pf, &protonum); |
6816d931 | 1547 | if (dataoff <= 0) { |
25985edc | 1548 | pr_debug("not prepared to track yet or error occurred\n"); |
93e66024 FW |
1549 | NF_CT_STAT_INC_ATOMIC(state->net, error); |
1550 | NF_CT_STAT_INC_ATOMIC(state->net, invalid); | |
6816d931 | 1551 | ret = NF_ACCEPT; |
b2a15a60 | 1552 | goto out; |
9fb9cbb1 YK |
1553 | } |
1554 | ||
dd2934a9 | 1555 | l4proto = __nf_ct_l4proto_find(protonum); |
9fb9cbb1 | 1556 | |
6fe78fa4 FW |
1557 | if (protonum == IPPROTO_ICMP || protonum == IPPROTO_ICMPV6) { |
1558 | ret = nf_conntrack_handle_icmp(tmpl, skb, dataoff, | |
1559 | protonum, state); | |
74c51a14 | 1560 | if (ret <= 0) { |
b2a15a60 PM |
1561 | ret = -ret; |
1562 | goto out; | |
74c51a14 | 1563 | } |
88ed01d1 | 1564 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
a9e419dc | 1565 | if (skb->_nfct) |
88ed01d1 | 1566 | goto out; |
9fb9cbb1 | 1567 | } |
08733a0c | 1568 | repeat: |
93e66024 FW |
1569 | ret = resolve_normal_ct(tmpl, skb, dataoff, |
1570 | protonum, l4proto, state); | |
fc09e4a7 | 1571 | if (ret < 0) { |
9fb9cbb1 | 1572 | /* Too stressed to deal. */ |
93e66024 | 1573 | NF_CT_STAT_INC_ATOMIC(state->net, drop); |
b2a15a60 PM |
1574 | ret = NF_DROP; |
1575 | goto out; | |
9fb9cbb1 YK |
1576 | } |
1577 | ||
fc09e4a7 FW |
1578 | ct = nf_ct_get(skb, &ctinfo); |
1579 | if (!ct) { | |
1580 | /* Not valid part of a connection */ | |
93e66024 | 1581 | NF_CT_STAT_INC_ATOMIC(state->net, invalid); |
fc09e4a7 FW |
1582 | ret = NF_ACCEPT; |
1583 | goto out; | |
1584 | } | |
9fb9cbb1 | 1585 | |
93e66024 | 1586 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, state); |
ec8d5409 | 1587 | if (ret <= 0) { |
9fb9cbb1 YK |
1588 | /* Invalid: inverse of the return code tells |
1589 | * the netfilter core what to do */ | |
0d53778e | 1590 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
97a6ad13 | 1591 | nf_conntrack_put(&ct->ct_general); |
a9e419dc | 1592 | skb->_nfct = 0; |
93e66024 | 1593 | NF_CT_STAT_INC_ATOMIC(state->net, invalid); |
7d1e0459 | 1594 | if (ret == -NF_DROP) |
93e66024 | 1595 | NF_CT_STAT_INC_ATOMIC(state->net, drop); |
56a62e22 AB |
1596 | /* Special case: TCP tracker reports an attempt to reopen a |
1597 | * closed/aborted connection. We have to go back and create a | |
1598 | * fresh conntrack. | |
1599 | */ | |
1600 | if (ret == -NF_REPEAT) | |
1601 | goto repeat; | |
b2a15a60 PM |
1602 | ret = -ret; |
1603 | goto out; | |
9fb9cbb1 YK |
1604 | } |
1605 | ||
fc09e4a7 FW |
1606 | if (ctinfo == IP_CT_ESTABLISHED_REPLY && |
1607 | !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1608 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1609 | out: |
56a62e22 AB |
1610 | if (tmpl) |
1611 | nf_ct_put(tmpl); | |
9fb9cbb1 YK |
1612 | |
1613 | return ret; | |
1614 | } | |
13b18339 | 1615 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1616 | |
5f2b4c90 JE |
1617 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1618 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1619 | { |
5f2b4c90 | 1620 | bool ret; |
923f4902 PM |
1621 | |
1622 | rcu_read_lock(); | |
1623 | ret = nf_ct_invert_tuple(inverse, orig, | |
dd2934a9 | 1624 | __nf_ct_l4proto_find(orig->dst.protonum)); |
923f4902 PM |
1625 | rcu_read_unlock(); |
1626 | return ret; | |
9fb9cbb1 | 1627 | } |
13b18339 | 1628 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1629 | |
5b1158e9 JK |
1630 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1631 | implicitly racy: see __nf_conntrack_confirm */ | |
1632 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1633 | const struct nf_conntrack_tuple *newreply) | |
1634 | { | |
1635 | struct nf_conn_help *help = nfct_help(ct); | |
1636 | ||
5b1158e9 | 1637 | /* Should be unconfirmed, so not in hash table yet */ |
44d6e2f2 | 1638 | WARN_ON(nf_ct_is_confirmed(ct)); |
5b1158e9 | 1639 | |
0d53778e | 1640 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1641 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1642 | |
1643 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1644 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1645 | return; |
ceceae1b | 1646 | |
c52fbb41 | 1647 | rcu_read_lock(); |
b2a15a60 | 1648 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1649 | rcu_read_unlock(); |
5b1158e9 | 1650 | } |
13b18339 | 1651 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1652 | |
9fb9cbb1 YK |
1653 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1654 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1655 | enum ip_conntrack_info ctinfo, | |
1656 | const struct sk_buff *skb, | |
1657 | unsigned long extra_jiffies, | |
1658 | int do_acct) | |
1659 | { | |
44d6e2f2 | 1660 | WARN_ON(!skb); |
9fb9cbb1 | 1661 | |
997ae831 | 1662 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1663 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1664 | goto acct; | |
997ae831 | 1665 | |
9fb9cbb1 | 1666 | /* If not in hash table, timer will not be active yet */ |
f330a7fd FW |
1667 | if (nf_ct_is_confirmed(ct)) |
1668 | extra_jiffies += nfct_time_stamp; | |
9fb9cbb1 | 1669 | |
f330a7fd | 1670 | ct->timeout = extra_jiffies; |
47d95045 | 1671 | acct: |
ba76738c PNA |
1672 | if (do_acct) |
1673 | nf_ct_acct_update(ct, ctinfo, skb->len); | |
9fb9cbb1 | 1674 | } |
13b18339 | 1675 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1676 | |
ad66713f FW |
1677 | bool nf_ct_kill_acct(struct nf_conn *ct, |
1678 | enum ip_conntrack_info ctinfo, | |
1679 | const struct sk_buff *skb) | |
51091764 | 1680 | { |
ad66713f | 1681 | nf_ct_acct_update(ct, ctinfo, skb->len); |
58401572 | 1682 | |
f330a7fd | 1683 | return nf_ct_delete(ct, 0, 0); |
51091764 | 1684 | } |
ad66713f | 1685 | EXPORT_SYMBOL_GPL(nf_ct_kill_acct); |
51091764 | 1686 | |
c0cd1156 | 1687 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1688 | |
1689 | #include <linux/netfilter/nfnetlink.h> | |
1690 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1691 | #include <linux/mutex.h> |
1692 | ||
c1d10adb PNA |
1693 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1694 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1695 | * or depend on ctnetlink */ | |
fdf70832 | 1696 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1697 | const struct nf_conntrack_tuple *tuple) |
1698 | { | |
bae65be8 DM |
1699 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1700 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1701 | goto nla_put_failure; | |
c1d10adb PNA |
1702 | return 0; |
1703 | ||
df6fb868 | 1704 | nla_put_failure: |
c1d10adb PNA |
1705 | return -1; |
1706 | } | |
fdf70832 | 1707 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1708 | |
f73e924c PM |
1709 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1710 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1711 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1712 | }; |
f73e924c | 1713 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1714 | |
fdf70832 | 1715 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1716 | struct nf_conntrack_tuple *t) |
1717 | { | |
df6fb868 | 1718 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1719 | return -EINVAL; |
1720 | ||
77236b6e PM |
1721 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1722 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1723 | |
1724 | return 0; | |
1725 | } | |
fdf70832 | 1726 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d | 1727 | |
5caaed15 | 1728 | unsigned int nf_ct_port_nlattr_tuple_size(void) |
5c0de29d | 1729 | { |
5caaed15 FW |
1730 | static unsigned int size __read_mostly; |
1731 | ||
1732 | if (!size) | |
1733 | size = nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1734 | ||
1735 | return size; | |
5c0de29d HE |
1736 | } |
1737 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1738 | #endif |
1739 | ||
9fb9cbb1 | 1740 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1741 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1742 | { |
1743 | struct nf_conn *ct; | |
1744 | enum ip_conntrack_info ctinfo; | |
1745 | ||
1746 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1747 | ct = nf_ct_get(skb, &ctinfo); | |
1748 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1749 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1750 | else |
1751 | ctinfo = IP_CT_RELATED; | |
1752 | ||
1753 | /* Attach to new skbuff, and increment count */ | |
c74454fa | 1754 | nf_ct_set(nskb, ct, ctinfo); |
cb9c6836 | 1755 | nf_conntrack_get(skb_nfct(nskb)); |
9fb9cbb1 YK |
1756 | } |
1757 | ||
368982cd PNA |
1758 | static int nf_conntrack_update(struct net *net, struct sk_buff *skb) |
1759 | { | |
368982cd PNA |
1760 | const struct nf_conntrack_l4proto *l4proto; |
1761 | struct nf_conntrack_tuple_hash *h; | |
1762 | struct nf_conntrack_tuple tuple; | |
1763 | enum ip_conntrack_info ctinfo; | |
1764 | struct nf_nat_hook *nat_hook; | |
6816d931 | 1765 | unsigned int status; |
368982cd | 1766 | struct nf_conn *ct; |
6816d931 | 1767 | int dataoff; |
368982cd PNA |
1768 | u16 l3num; |
1769 | u8 l4num; | |
1770 | ||
1771 | ct = nf_ct_get(skb, &ctinfo); | |
1772 | if (!ct || nf_ct_is_confirmed(ct)) | |
1773 | return 0; | |
1774 | ||
1775 | l3num = nf_ct_l3num(ct); | |
368982cd | 1776 | |
6816d931 FW |
1777 | dataoff = get_l4proto(skb, skb_network_offset(skb), l3num, &l4num); |
1778 | if (dataoff <= 0) | |
368982cd PNA |
1779 | return -1; |
1780 | ||
dd2934a9 | 1781 | l4proto = nf_ct_l4proto_find_get(l4num); |
368982cd PNA |
1782 | |
1783 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, | |
47a91b14 | 1784 | l4num, net, &tuple, l4proto)) |
368982cd PNA |
1785 | return -1; |
1786 | ||
1787 | if (ct->status & IPS_SRC_NAT) { | |
1788 | memcpy(tuple.src.u3.all, | |
1789 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.all, | |
1790 | sizeof(tuple.src.u3.all)); | |
1791 | tuple.src.u.all = | |
1792 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.all; | |
1793 | } | |
1794 | ||
1795 | if (ct->status & IPS_DST_NAT) { | |
1796 | memcpy(tuple.dst.u3.all, | |
1797 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.all, | |
1798 | sizeof(tuple.dst.u3.all)); | |
1799 | tuple.dst.u.all = | |
1800 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.all; | |
1801 | } | |
1802 | ||
1803 | h = nf_conntrack_find_get(net, nf_ct_zone(ct), &tuple); | |
1804 | if (!h) | |
1805 | return 0; | |
1806 | ||
1807 | /* Store status bits of the conntrack that is clashing to re-do NAT | |
1808 | * mangling according to what it has been done already to this packet. | |
1809 | */ | |
1810 | status = ct->status; | |
1811 | ||
1812 | nf_ct_put(ct); | |
1813 | ct = nf_ct_tuplehash_to_ctrack(h); | |
1814 | nf_ct_set(skb, ct, ctinfo); | |
1815 | ||
1816 | nat_hook = rcu_dereference(nf_nat_hook); | |
1817 | if (!nat_hook) | |
1818 | return 0; | |
1819 | ||
1820 | if (status & IPS_SRC_NAT && | |
1821 | nat_hook->manip_pkt(skb, ct, NF_NAT_MANIP_SRC, | |
1822 | IP_CT_DIR_ORIGINAL) == NF_DROP) | |
1823 | return -1; | |
1824 | ||
1825 | if (status & IPS_DST_NAT && | |
1826 | nat_hook->manip_pkt(skb, ct, NF_NAT_MANIP_DST, | |
1827 | IP_CT_DIR_ORIGINAL) == NF_DROP) | |
1828 | return -1; | |
1829 | ||
1830 | return 0; | |
1831 | } | |
1832 | ||
b60a6040 THJ |
1833 | static bool nf_conntrack_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, |
1834 | const struct sk_buff *skb) | |
1835 | { | |
1836 | const struct nf_conntrack_tuple *src_tuple; | |
1837 | const struct nf_conntrack_tuple_hash *hash; | |
1838 | struct nf_conntrack_tuple srctuple; | |
1839 | enum ip_conntrack_info ctinfo; | |
1840 | struct nf_conn *ct; | |
1841 | ||
1842 | ct = nf_ct_get(skb, &ctinfo); | |
1843 | if (ct) { | |
1844 | src_tuple = nf_ct_tuple(ct, CTINFO2DIR(ctinfo)); | |
1845 | memcpy(dst_tuple, src_tuple, sizeof(*dst_tuple)); | |
1846 | return true; | |
1847 | } | |
1848 | ||
1849 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
1850 | NFPROTO_IPV4, dev_net(skb->dev), | |
1851 | &srctuple)) | |
1852 | return false; | |
1853 | ||
1854 | hash = nf_conntrack_find_get(dev_net(skb->dev), | |
1855 | &nf_ct_zone_dflt, | |
1856 | &srctuple); | |
1857 | if (!hash) | |
1858 | return false; | |
1859 | ||
1860 | ct = nf_ct_tuplehash_to_ctrack(hash); | |
1861 | src_tuple = nf_ct_tuple(ct, !hash->tuple.dst.dir); | |
1862 | memcpy(dst_tuple, src_tuple, sizeof(*dst_tuple)); | |
1863 | nf_ct_put(ct); | |
1864 | ||
1865 | return true; | |
1866 | } | |
1867 | ||
9fb9cbb1 | 1868 | /* Bring out ya dead! */ |
df0933dc | 1869 | static struct nf_conn * |
2843fb69 | 1870 | get_next_corpse(int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1871 | void *data, unsigned int *bucket) |
1872 | { | |
df0933dc PM |
1873 | struct nf_conntrack_tuple_hash *h; |
1874 | struct nf_conn *ct; | |
ea781f19 | 1875 | struct hlist_nulls_node *n; |
93bb0ceb | 1876 | spinlock_t *lockp; |
9fb9cbb1 | 1877 | |
56d52d48 | 1878 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
93bb0ceb JDB |
1879 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
1880 | local_bh_disable(); | |
b16c2919 | 1881 | nf_conntrack_lock(lockp); |
56d52d48 FW |
1882 | if (*bucket < nf_conntrack_htable_size) { |
1883 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) { | |
93bb0ceb JDB |
1884 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1885 | continue; | |
1886 | ct = nf_ct_tuplehash_to_ctrack(h); | |
2843fb69 | 1887 | if (iter(ct, data)) |
93bb0ceb JDB |
1888 | goto found; |
1889 | } | |
df0933dc | 1890 | } |
93bb0ceb JDB |
1891 | spin_unlock(lockp); |
1892 | local_bh_enable(); | |
d93c6258 | 1893 | cond_resched(); |
601e68e1 | 1894 | } |
b7779d06 | 1895 | |
b0feacaa FW |
1896 | return NULL; |
1897 | found: | |
1898 | atomic_inc(&ct->ct_general.use); | |
1899 | spin_unlock(lockp); | |
1900 | local_bh_enable(); | |
1901 | return ct; | |
1902 | } | |
1903 | ||
2843fb69 FW |
1904 | static void nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), |
1905 | void *data, u32 portid, int report) | |
1906 | { | |
0d02d564 | 1907 | unsigned int bucket = 0, sequence; |
2843fb69 | 1908 | struct nf_conn *ct; |
2843fb69 FW |
1909 | |
1910 | might_sleep(); | |
1911 | ||
0d02d564 FW |
1912 | for (;;) { |
1913 | sequence = read_seqcount_begin(&nf_conntrack_generation); | |
2843fb69 | 1914 | |
0d02d564 FW |
1915 | while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) { |
1916 | /* Time to push up daises... */ | |
1917 | ||
1918 | nf_ct_delete(ct, portid, report); | |
1919 | nf_ct_put(ct); | |
1920 | cond_resched(); | |
1921 | } | |
1922 | ||
1923 | if (!read_seqcount_retry(&nf_conntrack_generation, sequence)) | |
1924 | break; | |
1925 | bucket = 0; | |
2843fb69 FW |
1926 | } |
1927 | } | |
1928 | ||
1929 | struct iter_data { | |
1930 | int (*iter)(struct nf_conn *i, void *data); | |
1931 | void *data; | |
1932 | struct net *net; | |
1933 | }; | |
1934 | ||
1935 | static int iter_net_only(struct nf_conn *i, void *data) | |
1936 | { | |
1937 | struct iter_data *d = data; | |
1938 | ||
1939 | if (!net_eq(d->net, nf_ct_net(i))) | |
1940 | return 0; | |
1941 | ||
1942 | return d->iter(i, d->data); | |
1943 | } | |
1944 | ||
b0feacaa FW |
1945 | static void |
1946 | __nf_ct_unconfirmed_destroy(struct net *net) | |
1947 | { | |
1948 | int cpu; | |
1949 | ||
b7779d06 | 1950 | for_each_possible_cpu(cpu) { |
b0feacaa FW |
1951 | struct nf_conntrack_tuple_hash *h; |
1952 | struct hlist_nulls_node *n; | |
1953 | struct ct_pcpu *pcpu; | |
1954 | ||
1955 | pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
b7779d06 JDB |
1956 | |
1957 | spin_lock_bh(&pcpu->lock); | |
1958 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { | |
b0feacaa FW |
1959 | struct nf_conn *ct; |
1960 | ||
b7779d06 | 1961 | ct = nf_ct_tuplehash_to_ctrack(h); |
b0feacaa FW |
1962 | |
1963 | /* we cannot call iter() on unconfirmed list, the | |
1964 | * owning cpu can reallocate ct->ext at any time. | |
1965 | */ | |
1966 | set_bit(IPS_DYING_BIT, &ct->status); | |
b7779d06 JDB |
1967 | } |
1968 | spin_unlock_bh(&pcpu->lock); | |
d93c6258 | 1969 | cond_resched(); |
b7779d06 | 1970 | } |
9fb9cbb1 YK |
1971 | } |
1972 | ||
84657984 FW |
1973 | void nf_ct_unconfirmed_destroy(struct net *net) |
1974 | { | |
1975 | might_sleep(); | |
1976 | ||
1977 | if (atomic_read(&net->ct.count) > 0) { | |
1978 | __nf_ct_unconfirmed_destroy(net); | |
e2a75007 | 1979 | nf_queue_nf_hook_drop(net); |
84657984 FW |
1980 | synchronize_net(); |
1981 | } | |
1982 | } | |
1983 | EXPORT_SYMBOL_GPL(nf_ct_unconfirmed_destroy); | |
1984 | ||
9fd6452d FW |
1985 | void nf_ct_iterate_cleanup_net(struct net *net, |
1986 | int (*iter)(struct nf_conn *i, void *data), | |
1987 | void *data, u32 portid, int report) | |
9fb9cbb1 | 1988 | { |
2843fb69 | 1989 | struct iter_data d; |
9fb9cbb1 | 1990 | |
d93c6258 FW |
1991 | might_sleep(); |
1992 | ||
88b68bc5 FW |
1993 | if (atomic_read(&net->ct.count) == 0) |
1994 | return; | |
1995 | ||
2843fb69 FW |
1996 | d.iter = iter; |
1997 | d.data = data; | |
1998 | d.net = net; | |
1999 | ||
2843fb69 FW |
2000 | nf_ct_iterate_cleanup(iter_net_only, &d, portid, report); |
2001 | } | |
2002 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup_net); | |
9fb9cbb1 | 2003 | |
2843fb69 FW |
2004 | /** |
2005 | * nf_ct_iterate_destroy - destroy unconfirmed conntracks and iterate table | |
2006 | * @iter: callback to invoke for each conntrack | |
2007 | * @data: data to pass to @iter | |
2008 | * | |
2009 | * Like nf_ct_iterate_cleanup, but first marks conntracks on the | |
2010 | * unconfirmed list as dying (so they will not be inserted into | |
2011 | * main table). | |
7866cc57 FW |
2012 | * |
2013 | * Can only be called in module exit path. | |
2843fb69 FW |
2014 | */ |
2015 | void | |
2016 | nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data), void *data) | |
2017 | { | |
2018 | struct net *net; | |
2019 | ||
f0b07bb1 | 2020 | down_read(&net_rwsem); |
2843fb69 FW |
2021 | for_each_net(net) { |
2022 | if (atomic_read(&net->ct.count) == 0) | |
2023 | continue; | |
2024 | __nf_ct_unconfirmed_destroy(net); | |
e2a75007 | 2025 | nf_queue_nf_hook_drop(net); |
9fb9cbb1 | 2026 | } |
f0b07bb1 | 2027 | up_read(&net_rwsem); |
2843fb69 | 2028 | |
7866cc57 FW |
2029 | /* Need to wait for netns cleanup worker to finish, if its |
2030 | * running -- it might have deleted a net namespace from | |
2031 | * the global list, so our __nf_ct_unconfirmed_destroy() might | |
2032 | * not have affected all namespaces. | |
2033 | */ | |
2034 | net_ns_barrier(); | |
2035 | ||
2843fb69 FW |
2036 | /* a conntrack could have been unlinked from unconfirmed list |
2037 | * before we grabbed pcpu lock in __nf_ct_unconfirmed_destroy(). | |
2038 | * This makes sure its inserted into conntrack table. | |
2039 | */ | |
2040 | synchronize_net(); | |
2041 | ||
2042 | nf_ct_iterate_cleanup(iter, data, 0, 0); | |
9fb9cbb1 | 2043 | } |
2843fb69 | 2044 | EXPORT_SYMBOL_GPL(nf_ct_iterate_destroy); |
9fb9cbb1 | 2045 | |
274d383b PNA |
2046 | static int kill_all(struct nf_conn *i, void *data) |
2047 | { | |
2843fb69 | 2048 | return net_eq(nf_ct_net(i), data); |
274d383b PNA |
2049 | } |
2050 | ||
f94161c1 | 2051 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 2052 | { |
b87a2f91 | 2053 | conntrack_gc_work.exiting = true; |
f94161c1 G |
2054 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
2055 | } | |
2056 | ||
2057 | void nf_conntrack_cleanup_end(void) | |
2058 | { | |
1f4b2439 | 2059 | RCU_INIT_POINTER(nf_ct_hook, NULL); |
b87a2f91 | 2060 | cancel_delayed_work_sync(&conntrack_gc_work.dwork); |
285189c7 | 2061 | kvfree(nf_conntrack_hash); |
56d52d48 | 2062 | |
04d87001 | 2063 | nf_conntrack_proto_fini(); |
41d73ec0 | 2064 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 2065 | nf_conntrack_labels_fini(); |
5e615b22 | 2066 | nf_conntrack_helper_fini(); |
8684094c | 2067 | nf_conntrack_timeout_fini(); |
3fe0f943 | 2068 | nf_conntrack_ecache_fini(); |
73f4001a | 2069 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 2070 | nf_conntrack_acct_fini(); |
83b4dbe1 | 2071 | nf_conntrack_expect_fini(); |
77571149 FW |
2072 | |
2073 | kmem_cache_destroy(nf_conntrack_cachep); | |
08f6547d | 2074 | } |
9fb9cbb1 | 2075 | |
f94161c1 G |
2076 | /* |
2077 | * Mishearing the voices in his head, our hero wonders how he's | |
2078 | * supposed to kill the mall. | |
2079 | */ | |
2080 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 2081 | { |
dece40e8 VD |
2082 | LIST_HEAD(single); |
2083 | ||
2084 | list_add(&net->exit_list, &single); | |
2085 | nf_conntrack_cleanup_net_list(&single); | |
2086 | } | |
2087 | ||
2088 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
2089 | { | |
2090 | int busy; | |
2091 | struct net *net; | |
2092 | ||
f94161c1 G |
2093 | /* |
2094 | * This makes sure all current packets have passed through | |
2095 | * netfilter framework. Roll on, two-stage module | |
2096 | * delete... | |
2097 | */ | |
2098 | synchronize_net(); | |
dece40e8 VD |
2099 | i_see_dead_people: |
2100 | busy = 0; | |
2101 | list_for_each_entry(net, net_exit_list, exit_list) { | |
2843fb69 | 2102 | nf_ct_iterate_cleanup(kill_all, net, 0, 0); |
dece40e8 VD |
2103 | if (atomic_read(&net->ct.count) != 0) |
2104 | busy = 1; | |
2105 | } | |
2106 | if (busy) { | |
9fb9cbb1 YK |
2107 | schedule(); |
2108 | goto i_see_dead_people; | |
2109 | } | |
2110 | ||
dece40e8 | 2111 | list_for_each_entry(net, net_exit_list, exit_list) { |
dece40e8 | 2112 | nf_conntrack_proto_pernet_fini(net); |
dece40e8 | 2113 | nf_conntrack_ecache_pernet_fini(net); |
dece40e8 | 2114 | nf_conntrack_expect_pernet_fini(net); |
dece40e8 | 2115 | free_percpu(net->ct.stat); |
b7779d06 | 2116 | free_percpu(net->ct.pcpu_lists); |
dece40e8 | 2117 | } |
08f6547d AD |
2118 | } |
2119 | ||
d862a662 | 2120 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 2121 | { |
ea781f19 ED |
2122 | struct hlist_nulls_head *hash; |
2123 | unsigned int nr_slots, i; | |
9fb9cbb1 | 2124 | |
9cc1c73a FW |
2125 | if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) |
2126 | return NULL; | |
2127 | ||
ea781f19 ED |
2128 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
2129 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
9cc1c73a | 2130 | |
285189c7 LR |
2131 | hash = kvmalloc_array(nr_slots, sizeof(struct hlist_nulls_head), |
2132 | GFP_KERNEL | __GFP_ZERO); | |
9fb9cbb1 | 2133 | |
ea781f19 ED |
2134 | if (hash && nulls) |
2135 | for (i = 0; i < nr_slots; i++) | |
2136 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
2137 | |
2138 | return hash; | |
2139 | } | |
ac565e5f | 2140 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 2141 | |
3183ab89 | 2142 | int nf_conntrack_hash_resize(unsigned int hashsize) |
9fb9cbb1 | 2143 | { |
3183ab89 FW |
2144 | int i, bucket; |
2145 | unsigned int old_size; | |
ea781f19 | 2146 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 2147 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 2148 | struct nf_conn *ct; |
9fb9cbb1 | 2149 | |
9fb9cbb1 YK |
2150 | if (!hashsize) |
2151 | return -EINVAL; | |
2152 | ||
d862a662 | 2153 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
2154 | if (!hash) |
2155 | return -ENOMEM; | |
2156 | ||
3183ab89 FW |
2157 | old_size = nf_conntrack_htable_size; |
2158 | if (old_size == hashsize) { | |
285189c7 | 2159 | kvfree(hash); |
3183ab89 FW |
2160 | return 0; |
2161 | } | |
2162 | ||
93bb0ceb JDB |
2163 | local_bh_disable(); |
2164 | nf_conntrack_all_lock(); | |
a3efd812 | 2165 | write_seqcount_begin(&nf_conntrack_generation); |
93bb0ceb | 2166 | |
76507f69 PM |
2167 | /* Lookups in the old hash might happen in parallel, which means we |
2168 | * might get false negatives during connection lookup. New connections | |
2169 | * created because of a false negative won't make it into the hash | |
93bb0ceb | 2170 | * though since that required taking the locks. |
76507f69 | 2171 | */ |
93bb0ceb | 2172 | |
56d52d48 FW |
2173 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
2174 | while (!hlist_nulls_empty(&nf_conntrack_hash[i])) { | |
2175 | h = hlist_nulls_entry(nf_conntrack_hash[i].first, | |
2176 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 2177 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 2178 | hlist_nulls_del_rcu(&h->hnnode); |
1b8c8a9f FW |
2179 | bucket = __hash_conntrack(nf_ct_net(ct), |
2180 | &h->tuple, hashsize); | |
ea781f19 | 2181 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
2182 | } |
2183 | } | |
56d52d48 FW |
2184 | old_size = nf_conntrack_htable_size; |
2185 | old_hash = nf_conntrack_hash; | |
9fb9cbb1 | 2186 | |
56d52d48 FW |
2187 | nf_conntrack_hash = hash; |
2188 | nf_conntrack_htable_size = hashsize; | |
93bb0ceb | 2189 | |
a3efd812 | 2190 | write_seqcount_end(&nf_conntrack_generation); |
93bb0ceb JDB |
2191 | nf_conntrack_all_unlock(); |
2192 | local_bh_enable(); | |
9fb9cbb1 | 2193 | |
5e3c61f9 | 2194 | synchronize_net(); |
285189c7 | 2195 | kvfree(old_hash); |
9fb9cbb1 YK |
2196 | return 0; |
2197 | } | |
3183ab89 | 2198 | |
e4dca7b7 | 2199 | int nf_conntrack_set_hashsize(const char *val, const struct kernel_param *kp) |
3183ab89 FW |
2200 | { |
2201 | unsigned int hashsize; | |
2202 | int rc; | |
2203 | ||
2204 | if (current->nsproxy->net_ns != &init_net) | |
2205 | return -EOPNOTSUPP; | |
2206 | ||
2207 | /* On boot, we can set this without any fancy locking. */ | |
2045cdfa | 2208 | if (!nf_conntrack_hash) |
3183ab89 FW |
2209 | return param_set_uint(val, kp); |
2210 | ||
2211 | rc = kstrtouint(val, 0, &hashsize); | |
2212 | if (rc) | |
2213 | return rc; | |
2214 | ||
2215 | return nf_conntrack_hash_resize(hashsize); | |
2216 | } | |
fae718dd | 2217 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 2218 | |
ab71632c | 2219 | static __always_inline unsigned int total_extension_size(void) |
b3a5db10 FW |
2220 | { |
2221 | /* remember to add new extensions below */ | |
2222 | BUILD_BUG_ON(NF_CT_EXT_NUM > 9); | |
2223 | ||
2224 | return sizeof(struct nf_ct_ext) + | |
2225 | sizeof(struct nf_conn_help) | |
2226 | #if IS_ENABLED(CONFIG_NF_NAT) | |
2227 | + sizeof(struct nf_conn_nat) | |
2228 | #endif | |
2229 | + sizeof(struct nf_conn_seqadj) | |
2230 | + sizeof(struct nf_conn_acct) | |
2231 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
2232 | + sizeof(struct nf_conntrack_ecache) | |
2233 | #endif | |
2234 | #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP | |
2235 | + sizeof(struct nf_conn_tstamp) | |
2236 | #endif | |
2237 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT | |
2238 | + sizeof(struct nf_conn_timeout) | |
2239 | #endif | |
2240 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
2241 | + sizeof(struct nf_conn_labels) | |
2242 | #endif | |
2243 | #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) | |
2244 | + sizeof(struct nf_conn_synproxy) | |
2245 | #endif | |
2246 | ; | |
2247 | }; | |
2248 | ||
f94161c1 | 2249 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 2250 | { |
ca79b0c2 | 2251 | unsigned long nr_pages = totalram_pages(); |
f205c5e0 | 2252 | int max_factor = 8; |
0c5366b3 | 2253 | int ret = -ENOMEM; |
cc41c84b | 2254 | int i; |
93bb0ceb | 2255 | |
b3a5db10 FW |
2256 | /* struct nf_ct_ext uses u8 to store offsets/size */ |
2257 | BUILD_BUG_ON(total_extension_size() > 255u); | |
2258 | ||
a3efd812 FW |
2259 | seqcount_init(&nf_conntrack_generation); |
2260 | ||
d5d20912 | 2261 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
93bb0ceb | 2262 | spin_lock_init(&nf_conntrack_locks[i]); |
9fb9cbb1 | 2263 | |
9fb9cbb1 | 2264 | if (!nf_conntrack_htable_size) { |
88eab472 ML |
2265 | /* Idea from tcp.c: use 1/16384 of memory. |
2266 | * On i386: 32MB machine has 512 buckets. | |
2267 | * >= 1GB machines have 16384 buckets. | |
2268 | * >= 4GB machines have 65536 buckets. | |
2269 | */ | |
9fb9cbb1 | 2270 | nf_conntrack_htable_size |
3d6357de | 2271 | = (((nr_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 2272 | / sizeof(struct hlist_head)); |
3d6357de | 2273 | if (nr_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
88eab472 | 2274 | nf_conntrack_htable_size = 65536; |
3d6357de | 2275 | else if (nr_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
2276 | nf_conntrack_htable_size = 16384; |
2277 | if (nf_conntrack_htable_size < 32) | |
2278 | nf_conntrack_htable_size = 32; | |
2279 | ||
2280 | /* Use a max. factor of four by default to get the same max as | |
2281 | * with the old struct list_heads. When a table size is given | |
2282 | * we use the old value of 8 to avoid reducing the max. | |
2283 | * entries. */ | |
2284 | max_factor = 4; | |
9fb9cbb1 | 2285 | } |
56d52d48 FW |
2286 | |
2287 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1); | |
2288 | if (!nf_conntrack_hash) | |
2289 | return -ENOMEM; | |
2290 | ||
f205c5e0 | 2291 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 2292 | |
0c5366b3 | 2293 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
a9e419dc FW |
2294 | sizeof(struct nf_conn), |
2295 | NFCT_INFOMASK + 1, | |
5f0d5a3a | 2296 | SLAB_TYPESAFE_BY_RCU | SLAB_HWCACHE_ALIGN, NULL); |
0c5366b3 FW |
2297 | if (!nf_conntrack_cachep) |
2298 | goto err_cachep; | |
2299 | ||
83b4dbe1 G |
2300 | ret = nf_conntrack_expect_init(); |
2301 | if (ret < 0) | |
2302 | goto err_expect; | |
2303 | ||
b7ff3a1f G |
2304 | ret = nf_conntrack_acct_init(); |
2305 | if (ret < 0) | |
2306 | goto err_acct; | |
2307 | ||
73f4001a G |
2308 | ret = nf_conntrack_tstamp_init(); |
2309 | if (ret < 0) | |
2310 | goto err_tstamp; | |
2311 | ||
3fe0f943 G |
2312 | ret = nf_conntrack_ecache_init(); |
2313 | if (ret < 0) | |
2314 | goto err_ecache; | |
2315 | ||
8684094c G |
2316 | ret = nf_conntrack_timeout_init(); |
2317 | if (ret < 0) | |
2318 | goto err_timeout; | |
2319 | ||
5e615b22 G |
2320 | ret = nf_conntrack_helper_init(); |
2321 | if (ret < 0) | |
2322 | goto err_helper; | |
2323 | ||
5f69b8f5 G |
2324 | ret = nf_conntrack_labels_init(); |
2325 | if (ret < 0) | |
2326 | goto err_labels; | |
2327 | ||
41d73ec0 PM |
2328 | ret = nf_conntrack_seqadj_init(); |
2329 | if (ret < 0) | |
2330 | goto err_seqadj; | |
2331 | ||
04d87001 G |
2332 | ret = nf_conntrack_proto_init(); |
2333 | if (ret < 0) | |
2334 | goto err_proto; | |
2335 | ||
b87a2f91 | 2336 | conntrack_gc_work_init(&conntrack_gc_work); |
0984d427 | 2337 | queue_delayed_work(system_power_efficient_wq, &conntrack_gc_work.dwork, HZ); |
b87a2f91 | 2338 | |
08f6547d AD |
2339 | return 0; |
2340 | ||
04d87001 | 2341 | err_proto: |
41d73ec0 PM |
2342 | nf_conntrack_seqadj_fini(); |
2343 | err_seqadj: | |
04d87001 | 2344 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
2345 | err_labels: |
2346 | nf_conntrack_helper_fini(); | |
5e615b22 G |
2347 | err_helper: |
2348 | nf_conntrack_timeout_fini(); | |
8684094c G |
2349 | err_timeout: |
2350 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
2351 | err_ecache: |
2352 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
2353 | err_tstamp: |
2354 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
2355 | err_acct: |
2356 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 2357 | err_expect: |
0c5366b3 FW |
2358 | kmem_cache_destroy(nf_conntrack_cachep); |
2359 | err_cachep: | |
285189c7 | 2360 | kvfree(nf_conntrack_hash); |
08f6547d AD |
2361 | return ret; |
2362 | } | |
2363 | ||
1f4b2439 | 2364 | static struct nf_ct_hook nf_conntrack_hook = { |
368982cd | 2365 | .update = nf_conntrack_update, |
1f4b2439 | 2366 | .destroy = destroy_conntrack, |
b60a6040 | 2367 | .get_tuple_skb = nf_conntrack_get_tuple_skb, |
1f4b2439 PNA |
2368 | }; |
2369 | ||
f94161c1 G |
2370 | void nf_conntrack_init_end(void) |
2371 | { | |
2372 | /* For use by REJECT target */ | |
2373 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1f4b2439 | 2374 | RCU_INIT_POINTER(nf_ct_hook, &nf_conntrack_hook); |
f94161c1 G |
2375 | } |
2376 | ||
8cc20198 ED |
2377 | /* |
2378 | * We need to use special "null" values, not used in hash table | |
2379 | */ | |
2380 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
2381 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 2382 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 2383 | |
f94161c1 | 2384 | int nf_conntrack_init_net(struct net *net) |
08f6547d | 2385 | { |
b7779d06 JDB |
2386 | int ret = -ENOMEM; |
2387 | int cpu; | |
ceceae1b | 2388 | |
cc41c84b | 2389 | BUILD_BUG_ON(IP_CT_UNTRACKED == IP_CT_NUMBER); |
08f6547d | 2390 | atomic_set(&net->ct.count, 0); |
b7779d06 JDB |
2391 | |
2392 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); | |
2393 | if (!net->ct.pcpu_lists) | |
08f6547d | 2394 | goto err_stat; |
b7779d06 JDB |
2395 | |
2396 | for_each_possible_cpu(cpu) { | |
2397 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
2398 | ||
2399 | spin_lock_init(&pcpu->lock); | |
2400 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); | |
2401 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); | |
08f6547d | 2402 | } |
5b3501fa | 2403 | |
b7779d06 JDB |
2404 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
2405 | if (!net->ct.stat) | |
2406 | goto err_pcpu_lists; | |
2407 | ||
83b4dbe1 | 2408 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
2409 | if (ret < 0) |
2410 | goto err_expect; | |
fc3893fd FW |
2411 | |
2412 | nf_conntrack_acct_pernet_init(net); | |
2413 | nf_conntrack_tstamp_pernet_init(net); | |
2414 | nf_conntrack_ecache_pernet_init(net); | |
2415 | nf_conntrack_helper_pernet_init(net); | |
2416 | ||
04d87001 | 2417 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
2418 | if (ret < 0) |
2419 | goto err_proto; | |
08f6547d | 2420 | return 0; |
c539f017 | 2421 | |
f94161c1 | 2422 | err_proto: |
3fe0f943 | 2423 | nf_conntrack_ecache_pernet_fini(net); |
83b4dbe1 | 2424 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 2425 | err_expect: |
0d55af87 | 2426 | free_percpu(net->ct.stat); |
b7779d06 JDB |
2427 | err_pcpu_lists: |
2428 | free_percpu(net->ct.pcpu_lists); | |
0d55af87 | 2429 | err_stat: |
08f6547d AD |
2430 | return ret; |
2431 | } |