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Commit | Line | Data |
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9fb9cbb1 YK |
1 | /* Connection state tracking for netfilter. This is separated from, |
2 | but required by, the NAT layer; it can also be used by an iptables | |
3 | extension. */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
dc808fe2 | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
9fb9cbb1 | 7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
f229f6ce | 8 | * (C) 2005-2012 Patrick McHardy <kaber@trash.net> |
9fb9cbb1 YK |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
13 | */ |
14 | ||
9fb9cbb1 YK |
15 | #include <linux/types.h> |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/module.h> | |
d43c36dc | 18 | #include <linux/sched.h> |
9fb9cbb1 YK |
19 | #include <linux/skbuff.h> |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/stddef.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/random.h> | |
25 | #include <linux/jhash.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/percpu.h> | |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/socket.h> | |
d7fe0f24 | 33 | #include <linux/mm.h> |
d696c7bd | 34 | #include <linux/nsproxy.h> |
ea781f19 | 35 | #include <linux/rculist_nulls.h> |
9fb9cbb1 | 36 | |
9fb9cbb1 YK |
37 | #include <net/netfilter/nf_conntrack.h> |
38 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 39 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 40 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 | 41 | #include <net/netfilter/nf_conntrack_helper.h> |
41d73ec0 | 42 | #include <net/netfilter/nf_conntrack_seqadj.h> |
9fb9cbb1 | 43 | #include <net/netfilter/nf_conntrack_core.h> |
ecfab2c9 | 44 | #include <net/netfilter/nf_conntrack_extend.h> |
58401572 | 45 | #include <net/netfilter/nf_conntrack_acct.h> |
a0891aa6 | 46 | #include <net/netfilter/nf_conntrack_ecache.h> |
5d0aa2cc | 47 | #include <net/netfilter/nf_conntrack_zones.h> |
a992ca2a | 48 | #include <net/netfilter/nf_conntrack_timestamp.h> |
dd705072 | 49 | #include <net/netfilter/nf_conntrack_timeout.h> |
c539f017 | 50 | #include <net/netfilter/nf_conntrack_labels.h> |
48b1de4c | 51 | #include <net/netfilter/nf_conntrack_synproxy.h> |
e6a7d3c0 | 52 | #include <net/netfilter/nf_nat.h> |
e17b666a | 53 | #include <net/netfilter/nf_nat_core.h> |
49376368 | 54 | #include <net/netfilter/nf_nat_helper.h> |
9fb9cbb1 | 55 | |
dc808fe2 | 56 | #define NF_CONNTRACK_VERSION "0.5.0" |
9fb9cbb1 | 57 | |
e17b666a PM |
58 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
59 | enum nf_nat_manip_type manip, | |
39938324 | 60 | const struct nlattr *attr) __read_mostly; |
e6a7d3c0 PNA |
61 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
62 | ||
c7232c99 PM |
63 | int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, |
64 | struct nf_conn *ct, | |
65 | enum ip_conntrack_info ctinfo, | |
66 | unsigned int protoff); | |
67 | EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); | |
68 | ||
f8ba1aff | 69 | DEFINE_SPINLOCK(nf_conntrack_lock); |
13b18339 | 70 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
9fb9cbb1 | 71 | |
e2b7606c | 72 | unsigned int nf_conntrack_htable_size __read_mostly; |
13b18339 PM |
73 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
74 | ||
e478075c | 75 | unsigned int nf_conntrack_max __read_mostly; |
a999e683 | 76 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
13b18339 | 77 | |
b3c5163f ED |
78 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
79 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); | |
13b18339 | 80 | |
f682cefa | 81 | unsigned int nf_conntrack_hash_rnd __read_mostly; |
4d4e61c6 | 82 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
9fb9cbb1 | 83 | |
99f07e91 | 84 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, u16 zone) |
9fb9cbb1 | 85 | { |
0794935e | 86 | unsigned int n; |
0794935e PM |
87 | |
88 | /* The direction must be ignored, so we hash everything up to the | |
89 | * destination ports (which is a multiple of 4) and treat the last | |
90 | * three bytes manually. | |
91 | */ | |
92 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); | |
99f07e91 CG |
93 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
94 | (((__force __u16)tuple->dst.u.all << 16) | | |
95 | tuple->dst.protonum)); | |
96 | } | |
97 | ||
98 | static u32 __hash_bucket(u32 hash, unsigned int size) | |
99 | { | |
100 | return ((u64)hash * size) >> 32; | |
101 | } | |
102 | ||
103 | static u32 hash_bucket(u32 hash, const struct net *net) | |
104 | { | |
105 | return __hash_bucket(hash, net->ct.htable_size); | |
106 | } | |
0794935e | 107 | |
99f07e91 CG |
108 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
109 | u16 zone, unsigned int size) | |
110 | { | |
111 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); | |
9fb9cbb1 YK |
112 | } |
113 | ||
5d0aa2cc | 114 | static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
d696c7bd | 115 | const struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 116 | { |
99f07e91 | 117 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
9fb9cbb1 YK |
118 | } |
119 | ||
5f2b4c90 | 120 | bool |
9fb9cbb1 YK |
121 | nf_ct_get_tuple(const struct sk_buff *skb, |
122 | unsigned int nhoff, | |
123 | unsigned int dataoff, | |
124 | u_int16_t l3num, | |
125 | u_int8_t protonum, | |
126 | struct nf_conntrack_tuple *tuple, | |
127 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 128 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 129 | { |
443a70d5 | 130 | memset(tuple, 0, sizeof(*tuple)); |
9fb9cbb1 YK |
131 | |
132 | tuple->src.l3num = l3num; | |
133 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) | |
5f2b4c90 | 134 | return false; |
9fb9cbb1 YK |
135 | |
136 | tuple->dst.protonum = protonum; | |
137 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
138 | ||
605dcad6 | 139 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
9fb9cbb1 | 140 | } |
13b18339 | 141 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
9fb9cbb1 | 142 | |
5f2b4c90 JE |
143 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
144 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) | |
e2a3123f YK |
145 | { |
146 | struct nf_conntrack_l3proto *l3proto; | |
147 | struct nf_conntrack_l4proto *l4proto; | |
148 | unsigned int protoff; | |
149 | u_int8_t protonum; | |
150 | int ret; | |
151 | ||
152 | rcu_read_lock(); | |
153 | ||
154 | l3proto = __nf_ct_l3proto_find(l3num); | |
155 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); | |
156 | if (ret != NF_ACCEPT) { | |
157 | rcu_read_unlock(); | |
5f2b4c90 | 158 | return false; |
e2a3123f YK |
159 | } |
160 | ||
161 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
162 | ||
163 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, | |
164 | l3proto, l4proto); | |
165 | ||
166 | rcu_read_unlock(); | |
167 | return ret; | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); | |
170 | ||
5f2b4c90 | 171 | bool |
9fb9cbb1 YK |
172 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
173 | const struct nf_conntrack_tuple *orig, | |
174 | const struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 175 | const struct nf_conntrack_l4proto *l4proto) |
9fb9cbb1 | 176 | { |
443a70d5 | 177 | memset(inverse, 0, sizeof(*inverse)); |
9fb9cbb1 YK |
178 | |
179 | inverse->src.l3num = orig->src.l3num; | |
180 | if (l3proto->invert_tuple(inverse, orig) == 0) | |
5f2b4c90 | 181 | return false; |
9fb9cbb1 YK |
182 | |
183 | inverse->dst.dir = !orig->dst.dir; | |
184 | ||
185 | inverse->dst.protonum = orig->dst.protonum; | |
605dcad6 | 186 | return l4proto->invert_tuple(inverse, orig); |
9fb9cbb1 | 187 | } |
13b18339 | 188 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
9fb9cbb1 | 189 | |
9fb9cbb1 YK |
190 | static void |
191 | clean_from_lists(struct nf_conn *ct) | |
192 | { | |
0d53778e | 193 | pr_debug("clean_from_lists(%p)\n", ct); |
ea781f19 ED |
194 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
195 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); | |
9fb9cbb1 YK |
196 | |
197 | /* Destroy all pending expectations */ | |
c1d10adb | 198 | nf_ct_remove_expectations(ct); |
9fb9cbb1 YK |
199 | } |
200 | ||
201 | static void | |
202 | destroy_conntrack(struct nf_conntrack *nfct) | |
203 | { | |
204 | struct nf_conn *ct = (struct nf_conn *)nfct; | |
0d55af87 | 205 | struct net *net = nf_ct_net(ct); |
605dcad6 | 206 | struct nf_conntrack_l4proto *l4proto; |
9fb9cbb1 | 207 | |
0d53778e | 208 | pr_debug("destroy_conntrack(%p)\n", ct); |
9fb9cbb1 YK |
209 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
210 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); | |
211 | ||
9fb9cbb1 YK |
212 | /* To make sure we don't get any weird locking issues here: |
213 | * destroy_conntrack() MUST NOT be called with a write lock | |
214 | * to nf_conntrack_lock!!! -HW */ | |
923f4902 | 215 | rcu_read_lock(); |
5e8fbe2a | 216 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 MJ |
217 | if (l4proto && l4proto->destroy) |
218 | l4proto->destroy(ct); | |
9fb9cbb1 | 219 | |
982d9a9c | 220 | rcu_read_unlock(); |
9fb9cbb1 | 221 | |
f8ba1aff | 222 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
223 | /* Expectations will have been removed in clean_from_lists, |
224 | * except TFTP can create an expectation on the first packet, | |
225 | * before connection is in the list, so we need to clean here, | |
226 | * too. */ | |
c1d10adb | 227 | nf_ct_remove_expectations(ct); |
9fb9cbb1 | 228 | |
04dac011 PNA |
229 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
230 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); | |
231 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); | |
9fb9cbb1 | 232 | |
0d55af87 | 233 | NF_CT_STAT_INC(net, delete); |
f8ba1aff | 234 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
235 | |
236 | if (ct->master) | |
237 | nf_ct_put(ct->master); | |
238 | ||
0d53778e | 239 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
9fb9cbb1 YK |
240 | nf_conntrack_free(ct); |
241 | } | |
242 | ||
02982c27 | 243 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
9fb9cbb1 | 244 | { |
0d55af87 | 245 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 | 246 | |
9858a3ae | 247 | nf_ct_helper_destroy(ct); |
f8ba1aff | 248 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
249 | /* Inside lock so preempt is disabled on module removal path. |
250 | * Otherwise we can get spurious warnings. */ | |
0d55af87 | 251 | NF_CT_STAT_INC(net, delete_list); |
9fb9cbb1 | 252 | clean_from_lists(ct); |
04dac011 PNA |
253 | /* add this conntrack to the dying list */ |
254 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, | |
255 | &net->ct.dying); | |
f8ba1aff | 256 | spin_unlock_bh(&nf_conntrack_lock); |
dd7669a9 | 257 | } |
dd7669a9 PNA |
258 | |
259 | static void death_by_event(unsigned long ul_conntrack) | |
260 | { | |
261 | struct nf_conn *ct = (void *)ul_conntrack; | |
262 | struct net *net = nf_ct_net(ct); | |
5b423f6a PNA |
263 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
264 | ||
265 | BUG_ON(ecache == NULL); | |
dd7669a9 PNA |
266 | |
267 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { | |
268 | /* bad luck, let's retry again */ | |
5b423f6a | 269 | ecache->timeout.expires = jiffies + |
ca3d41a5 | 270 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
5b423f6a | 271 | add_timer(&ecache->timeout); |
dd7669a9 PNA |
272 | return; |
273 | } | |
274 | /* we've got the event delivered, now it's dying */ | |
275 | set_bit(IPS_DYING_BIT, &ct->status); | |
dd7669a9 PNA |
276 | nf_ct_put(ct); |
277 | } | |
278 | ||
02982c27 | 279 | static void nf_ct_dying_timeout(struct nf_conn *ct) |
dd7669a9 PNA |
280 | { |
281 | struct net *net = nf_ct_net(ct); | |
5b423f6a PNA |
282 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
283 | ||
284 | BUG_ON(ecache == NULL); | |
dd7669a9 | 285 | |
dd7669a9 | 286 | /* set a new timer to retry event delivery */ |
5b423f6a PNA |
287 | setup_timer(&ecache->timeout, death_by_event, (unsigned long)ct); |
288 | ecache->timeout.expires = jiffies + | |
ca3d41a5 | 289 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
5b423f6a | 290 | add_timer(&ecache->timeout); |
dd7669a9 | 291 | } |
dd7669a9 | 292 | |
02982c27 | 293 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
dd7669a9 | 294 | { |
a992ca2a PNA |
295 | struct nf_conn_tstamp *tstamp; |
296 | ||
297 | tstamp = nf_conn_tstamp_find(ct); | |
298 | if (tstamp && tstamp->stop == 0) | |
299 | tstamp->stop = ktime_to_ns(ktime_get_real()); | |
dd7669a9 | 300 | |
02982c27 FW |
301 | if (!nf_ct_is_dying(ct) && |
302 | unlikely(nf_conntrack_event_report(IPCT_DESTROY, ct, | |
303 | portid, report) < 0)) { | |
dd7669a9 PNA |
304 | /* destroy event was not delivered */ |
305 | nf_ct_delete_from_lists(ct); | |
04dac011 | 306 | nf_ct_dying_timeout(ct); |
02982c27 | 307 | return false; |
dd7669a9 PNA |
308 | } |
309 | set_bit(IPS_DYING_BIT, &ct->status); | |
310 | nf_ct_delete_from_lists(ct); | |
9fb9cbb1 | 311 | nf_ct_put(ct); |
02982c27 FW |
312 | return true; |
313 | } | |
314 | EXPORT_SYMBOL_GPL(nf_ct_delete); | |
315 | ||
316 | static void death_by_timeout(unsigned long ul_conntrack) | |
317 | { | |
318 | nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0); | |
9fb9cbb1 YK |
319 | } |
320 | ||
ea781f19 ED |
321 | /* |
322 | * Warning : | |
323 | * - Caller must take a reference on returned object | |
324 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) | |
325 | * OR | |
326 | * - Caller must lock nf_conntrack_lock before calling this function | |
327 | */ | |
99f07e91 CG |
328 | static struct nf_conntrack_tuple_hash * |
329 | ____nf_conntrack_find(struct net *net, u16 zone, | |
330 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
331 | { |
332 | struct nf_conntrack_tuple_hash *h; | |
ea781f19 | 333 | struct hlist_nulls_node *n; |
99f07e91 | 334 | unsigned int bucket = hash_bucket(hash, net); |
9fb9cbb1 | 335 | |
4e29e9ec PM |
336 | /* Disable BHs the entire time since we normally need to disable them |
337 | * at least once for the stats anyway. | |
338 | */ | |
339 | local_bh_disable(); | |
ea781f19 | 340 | begin: |
99f07e91 | 341 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
5d0aa2cc PM |
342 | if (nf_ct_tuple_equal(tuple, &h->tuple) && |
343 | nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { | |
0d55af87 | 344 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 345 | local_bh_enable(); |
9fb9cbb1 YK |
346 | return h; |
347 | } | |
0d55af87 | 348 | NF_CT_STAT_INC(net, searched); |
9fb9cbb1 | 349 | } |
ea781f19 ED |
350 | /* |
351 | * if the nulls value we got at the end of this lookup is | |
352 | * not the expected one, we must restart lookup. | |
353 | * We probably met an item that was moved to another chain. | |
354 | */ | |
99f07e91 | 355 | if (get_nulls_value(n) != bucket) { |
af740b2c | 356 | NF_CT_STAT_INC(net, search_restart); |
ea781f19 | 357 | goto begin; |
af740b2c | 358 | } |
4e29e9ec | 359 | local_bh_enable(); |
9fb9cbb1 YK |
360 | |
361 | return NULL; | |
362 | } | |
99f07e91 CG |
363 | |
364 | struct nf_conntrack_tuple_hash * | |
365 | __nf_conntrack_find(struct net *net, u16 zone, | |
366 | const struct nf_conntrack_tuple *tuple) | |
367 | { | |
368 | return ____nf_conntrack_find(net, zone, tuple, | |
369 | hash_conntrack_raw(tuple, zone)); | |
370 | } | |
13b18339 | 371 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
9fb9cbb1 YK |
372 | |
373 | /* Find a connection corresponding to a tuple. */ | |
99f07e91 CG |
374 | static struct nf_conntrack_tuple_hash * |
375 | __nf_conntrack_find_get(struct net *net, u16 zone, | |
376 | const struct nf_conntrack_tuple *tuple, u32 hash) | |
9fb9cbb1 YK |
377 | { |
378 | struct nf_conntrack_tuple_hash *h; | |
76507f69 | 379 | struct nf_conn *ct; |
9fb9cbb1 | 380 | |
76507f69 | 381 | rcu_read_lock(); |
ea781f19 | 382 | begin: |
99f07e91 | 383 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
76507f69 PM |
384 | if (h) { |
385 | ct = nf_ct_tuplehash_to_ctrack(h); | |
8d8890b7 PM |
386 | if (unlikely(nf_ct_is_dying(ct) || |
387 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
76507f69 | 388 | h = NULL; |
ea781f19 | 389 | else { |
5d0aa2cc PM |
390 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || |
391 | nf_ct_zone(ct) != zone)) { | |
ea781f19 ED |
392 | nf_ct_put(ct); |
393 | goto begin; | |
394 | } | |
395 | } | |
76507f69 PM |
396 | } |
397 | rcu_read_unlock(); | |
9fb9cbb1 YK |
398 | |
399 | return h; | |
400 | } | |
99f07e91 CG |
401 | |
402 | struct nf_conntrack_tuple_hash * | |
403 | nf_conntrack_find_get(struct net *net, u16 zone, | |
404 | const struct nf_conntrack_tuple *tuple) | |
405 | { | |
406 | return __nf_conntrack_find_get(net, zone, tuple, | |
407 | hash_conntrack_raw(tuple, zone)); | |
408 | } | |
13b18339 | 409 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
9fb9cbb1 | 410 | |
c1d10adb PNA |
411 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
412 | unsigned int hash, | |
601e68e1 | 413 | unsigned int repl_hash) |
c1d10adb | 414 | { |
400dad39 AD |
415 | struct net *net = nf_ct_net(ct); |
416 | ||
ea781f19 | 417 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
400dad39 | 418 | &net->ct.hash[hash]); |
ea781f19 | 419 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39 | 420 | &net->ct.hash[repl_hash]); |
c1d10adb PNA |
421 | } |
422 | ||
7d367e06 JK |
423 | int |
424 | nf_conntrack_hash_check_insert(struct nf_conn *ct) | |
c1d10adb | 425 | { |
d696c7bd | 426 | struct net *net = nf_ct_net(ct); |
c1d10adb | 427 | unsigned int hash, repl_hash; |
7d367e06 JK |
428 | struct nf_conntrack_tuple_hash *h; |
429 | struct hlist_nulls_node *n; | |
5d0aa2cc | 430 | u16 zone; |
c1d10adb | 431 | |
5d0aa2cc | 432 | zone = nf_ct_zone(ct); |
7d367e06 JK |
433 | hash = hash_conntrack(net, zone, |
434 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
435 | repl_hash = hash_conntrack(net, zone, | |
436 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
437 | ||
438 | spin_lock_bh(&nf_conntrack_lock); | |
439 | ||
440 | /* See if there's one in the list already, including reverse */ | |
441 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) | |
442 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
443 | &h->tuple) && | |
444 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
445 | goto out; | |
446 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) | |
447 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, | |
448 | &h->tuple) && | |
449 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
450 | goto out; | |
c1d10adb | 451 | |
7d367e06 JK |
452 | add_timer(&ct->timeout); |
453 | nf_conntrack_get(&ct->ct_general); | |
c1d10adb | 454 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
7d367e06 JK |
455 | NF_CT_STAT_INC(net, insert); |
456 | spin_unlock_bh(&nf_conntrack_lock); | |
457 | ||
458 | return 0; | |
459 | ||
460 | out: | |
461 | NF_CT_STAT_INC(net, insert_failed); | |
462 | spin_unlock_bh(&nf_conntrack_lock); | |
463 | return -EEXIST; | |
c1d10adb | 464 | } |
7d367e06 | 465 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
c1d10adb | 466 | |
9fb9cbb1 YK |
467 | /* Confirm a connection given skb; places it in hash table */ |
468 | int | |
3db05fea | 469 | __nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb1 YK |
470 | { |
471 | unsigned int hash, repl_hash; | |
df0933dc | 472 | struct nf_conntrack_tuple_hash *h; |
9fb9cbb1 | 473 | struct nf_conn *ct; |
df0933dc | 474 | struct nf_conn_help *help; |
a992ca2a | 475 | struct nf_conn_tstamp *tstamp; |
ea781f19 | 476 | struct hlist_nulls_node *n; |
9fb9cbb1 | 477 | enum ip_conntrack_info ctinfo; |
400dad39 | 478 | struct net *net; |
5d0aa2cc | 479 | u16 zone; |
9fb9cbb1 | 480 | |
3db05fea | 481 | ct = nf_ct_get(skb, &ctinfo); |
400dad39 | 482 | net = nf_ct_net(ct); |
9fb9cbb1 YK |
483 | |
484 | /* ipt_REJECT uses nf_conntrack_attach to attach related | |
485 | ICMP/TCP RST packets in other direction. Actual packet | |
486 | which created connection will be IP_CT_NEW or for an | |
487 | expected connection, IP_CT_RELATED. */ | |
488 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
489 | return NF_ACCEPT; | |
490 | ||
5d0aa2cc | 491 | zone = nf_ct_zone(ct); |
99f07e91 CG |
492 | /* reuse the hash saved before */ |
493 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; | |
494 | hash = hash_bucket(hash, net); | |
495 | repl_hash = hash_conntrack(net, zone, | |
496 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
9fb9cbb1 YK |
497 | |
498 | /* We're not in hash table, and we refuse to set up related | |
499 | connections for unconfirmed conns. But packet copies and | |
500 | REJECT will give spurious warnings here. */ | |
501 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ | |
502 | ||
25985edc | 503 | /* No external references means no one else could have |
9fb9cbb1 YK |
504 | confirmed us. */ |
505 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
0d53778e | 506 | pr_debug("Confirming conntrack %p\n", ct); |
9fb9cbb1 | 507 | |
f8ba1aff | 508 | spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 509 | |
fc350777 JM |
510 | /* We have to check the DYING flag inside the lock to prevent |
511 | a race against nf_ct_get_next_corpse() possibly called from | |
512 | user context, else we insert an already 'dead' hash, blocking | |
513 | further use of that particular connection -JM */ | |
514 | ||
515 | if (unlikely(nf_ct_is_dying(ct))) { | |
516 | spin_unlock_bh(&nf_conntrack_lock); | |
517 | return NF_ACCEPT; | |
518 | } | |
519 | ||
9fb9cbb1 YK |
520 | /* See if there's one in the list already, including reverse: |
521 | NAT could have grabbed it without realizing, since we're | |
522 | not in the hash. If there is, we lost race. */ | |
ea781f19 | 523 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dc | 524 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
5d0aa2cc PM |
525 | &h->tuple) && |
526 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 527 | goto out; |
ea781f19 | 528 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dc | 529 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
5d0aa2cc PM |
530 | &h->tuple) && |
531 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) | |
df0933dc | 532 | goto out; |
9fb9cbb1 | 533 | |
df0933dc | 534 | /* Remove from unconfirmed list */ |
ea781f19 | 535 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dc | 536 | |
df0933dc PM |
537 | /* Timer relative to confirmation time, not original |
538 | setting time, otherwise we'd get timer wrap in | |
539 | weird delay cases. */ | |
540 | ct->timeout.expires += jiffies; | |
541 | add_timer(&ct->timeout); | |
542 | atomic_inc(&ct->ct_general.use); | |
45eec341 | 543 | ct->status |= IPS_CONFIRMED; |
5c8ec910 | 544 | |
a992ca2a PNA |
545 | /* set conntrack timestamp, if enabled. */ |
546 | tstamp = nf_conn_tstamp_find(ct); | |
547 | if (tstamp) { | |
548 | if (skb->tstamp.tv64 == 0) | |
e3192690 | 549 | __net_timestamp(skb); |
a992ca2a PNA |
550 | |
551 | tstamp->start = ktime_to_ns(skb->tstamp); | |
552 | } | |
5c8ec910 PM |
553 | /* Since the lookup is lockless, hash insertion must be done after |
554 | * starting the timer and setting the CONFIRMED bit. The RCU barriers | |
555 | * guarantee that no other CPU can find the conntrack before the above | |
556 | * stores are visible. | |
557 | */ | |
558 | __nf_conntrack_hash_insert(ct, hash, repl_hash); | |
0d55af87 | 559 | NF_CT_STAT_INC(net, insert); |
f8ba1aff | 560 | spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910 | 561 | |
df0933dc PM |
562 | help = nfct_help(ct); |
563 | if (help && help->helper) | |
a71996fc | 564 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4ea | 565 | |
df0933dc | 566 | nf_conntrack_event_cache(master_ct(ct) ? |
a71996fc | 567 | IPCT_RELATED : IPCT_NEW, ct); |
df0933dc | 568 | return NF_ACCEPT; |
9fb9cbb1 | 569 | |
df0933dc | 570 | out: |
0d55af87 | 571 | NF_CT_STAT_INC(net, insert_failed); |
f8ba1aff | 572 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
573 | return NF_DROP; |
574 | } | |
13b18339 | 575 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb1 YK |
576 | |
577 | /* Returns true if a connection correspondings to the tuple (required | |
578 | for NAT). */ | |
579 | int | |
580 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
581 | const struct nf_conn *ignored_conntrack) | |
582 | { | |
400dad39 | 583 | struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb1 | 584 | struct nf_conntrack_tuple_hash *h; |
ea781f19 | 585 | struct hlist_nulls_node *n; |
5d0aa2cc PM |
586 | struct nf_conn *ct; |
587 | u16 zone = nf_ct_zone(ignored_conntrack); | |
588 | unsigned int hash = hash_conntrack(net, zone, tuple); | |
9fb9cbb1 | 589 | |
4e29e9ec PM |
590 | /* Disable BHs the entire time since we need to disable them at |
591 | * least once for the stats anyway. | |
592 | */ | |
593 | rcu_read_lock_bh(); | |
ea781f19 | 594 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
5d0aa2cc PM |
595 | ct = nf_ct_tuplehash_to_ctrack(h); |
596 | if (ct != ignored_conntrack && | |
597 | nf_ct_tuple_equal(tuple, &h->tuple) && | |
598 | nf_ct_zone(ct) == zone) { | |
0d55af87 | 599 | NF_CT_STAT_INC(net, found); |
4e29e9ec | 600 | rcu_read_unlock_bh(); |
ba419aff PM |
601 | return 1; |
602 | } | |
0d55af87 | 603 | NF_CT_STAT_INC(net, searched); |
ba419aff | 604 | } |
4e29e9ec | 605 | rcu_read_unlock_bh(); |
9fb9cbb1 | 606 | |
ba419aff | 607 | return 0; |
9fb9cbb1 | 608 | } |
13b18339 | 609 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb1 | 610 | |
7ae7730f PM |
611 | #define NF_CT_EVICTION_RANGE 8 |
612 | ||
9fb9cbb1 YK |
613 | /* There's a small race here where we may free a just-assured |
614 | connection. Too bad: we're in trouble anyway. */ | |
400dad39 | 615 | static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb1 | 616 | { |
f205c5e0 | 617 | /* Use oldest entry, which is roughly LRU */ |
9fb9cbb1 | 618 | struct nf_conntrack_tuple_hash *h; |
df0933dc | 619 | struct nf_conn *ct = NULL, *tmp; |
ea781f19 | 620 | struct hlist_nulls_node *n; |
7ae7730f | 621 | unsigned int i, cnt = 0; |
9fb9cbb1 YK |
622 | int dropped = 0; |
623 | ||
76507f69 | 624 | rcu_read_lock(); |
d696c7bd | 625 | for (i = 0; i < net->ct.htable_size; i++) { |
ea781f19 ED |
626 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
627 | hnnode) { | |
7ae7730f PM |
628 | tmp = nf_ct_tuplehash_to_ctrack(h); |
629 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) | |
630 | ct = tmp; | |
631 | cnt++; | |
632 | } | |
76507f69 | 633 | |
5ae27aa2 CG |
634 | if (ct != NULL) { |
635 | if (likely(!nf_ct_is_dying(ct) && | |
636 | atomic_inc_not_zero(&ct->ct_general.use))) | |
637 | break; | |
638 | else | |
639 | ct = NULL; | |
640 | } | |
641 | ||
642 | if (cnt >= NF_CT_EVICTION_RANGE) | |
7ae7730f | 643 | break; |
5ae27aa2 | 644 | |
d696c7bd | 645 | hash = (hash + 1) % net->ct.htable_size; |
9fb9cbb1 | 646 | } |
76507f69 | 647 | rcu_read_unlock(); |
9fb9cbb1 YK |
648 | |
649 | if (!ct) | |
650 | return dropped; | |
651 | ||
652 | if (del_timer(&ct->timeout)) { | |
02982c27 | 653 | if (nf_ct_delete(ct, 0, 0)) { |
74138511 PNA |
654 | dropped = 1; |
655 | NF_CT_STAT_INC_ATOMIC(net, early_drop); | |
656 | } | |
9fb9cbb1 YK |
657 | } |
658 | nf_ct_put(ct); | |
659 | return dropped; | |
660 | } | |
661 | ||
f682cefa CG |
662 | void init_nf_conntrack_hash_rnd(void) |
663 | { | |
664 | unsigned int rand; | |
665 | ||
666 | /* | |
667 | * Why not initialize nf_conntrack_rnd in a "init()" function ? | |
668 | * Because there isn't enough entropy when system initializing, | |
669 | * and we initialize it as late as possible. | |
670 | */ | |
671 | do { | |
672 | get_random_bytes(&rand, sizeof(rand)); | |
673 | } while (!rand); | |
674 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); | |
675 | } | |
676 | ||
99f07e91 CG |
677 | static struct nf_conn * |
678 | __nf_conntrack_alloc(struct net *net, u16 zone, | |
679 | const struct nf_conntrack_tuple *orig, | |
680 | const struct nf_conntrack_tuple *repl, | |
681 | gfp_t gfp, u32 hash) | |
9fb9cbb1 | 682 | { |
cd7fcbf1 | 683 | struct nf_conn *ct; |
9fb9cbb1 | 684 | |
b2390969 | 685 | if (unlikely(!nf_conntrack_hash_rnd)) { |
f682cefa | 686 | init_nf_conntrack_hash_rnd(); |
99f07e91 CG |
687 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
688 | hash = hash_conntrack_raw(orig, zone); | |
9fb9cbb1 YK |
689 | } |
690 | ||
5251e2d2 | 691 | /* We don't want any race condition at early drop stage */ |
49ac8713 | 692 | atomic_inc(&net->ct.count); |
5251e2d2 | 693 | |
76eb9460 | 694 | if (nf_conntrack_max && |
49ac8713 | 695 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
99f07e91 | 696 | if (!early_drop(net, hash_bucket(hash, net))) { |
49ac8713 | 697 | atomic_dec(&net->ct.count); |
e87cc472 | 698 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
9fb9cbb1 YK |
699 | return ERR_PTR(-ENOMEM); |
700 | } | |
701 | } | |
702 | ||
941297f4 ED |
703 | /* |
704 | * Do not use kmem_cache_zalloc(), as this cache uses | |
705 | * SLAB_DESTROY_BY_RCU. | |
706 | */ | |
5b3501fa | 707 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
c88130bc | 708 | if (ct == NULL) { |
49ac8713 | 709 | atomic_dec(&net->ct.count); |
dacd2a1a | 710 | return ERR_PTR(-ENOMEM); |
9fb9cbb1 | 711 | } |
941297f4 ED |
712 | /* |
713 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next | |
714 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. | |
715 | */ | |
716 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, | |
e5fc9e7a CG |
717 | offsetof(struct nf_conn, proto) - |
718 | offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); | |
440f0d58 | 719 | spin_lock_init(&ct->lock); |
c88130bc | 720 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f4 | 721 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bc | 722 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91 CG |
723 | /* save hash for reusing when confirming */ |
724 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; | |
9fb9cbb1 | 725 | /* Don't set timer yet: wait for confirmation */ |
c88130bc | 726 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9b | 727 | write_pnet(&ct->ct_net, net); |
5d0aa2cc PM |
728 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
729 | if (zone) { | |
730 | struct nf_conntrack_zone *nf_ct_zone; | |
731 | ||
732 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); | |
733 | if (!nf_ct_zone) | |
734 | goto out_free; | |
735 | nf_ct_zone->id = zone; | |
736 | } | |
737 | #endif | |
941297f4 ED |
738 | /* |
739 | * changes to lookup keys must be done before setting refcnt to 1 | |
740 | */ | |
741 | smp_wmb(); | |
742 | atomic_set(&ct->ct_general.use, 1); | |
c88130bc | 743 | return ct; |
5d0aa2cc PM |
744 | |
745 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
746 | out_free: | |
d96fc659 | 747 | atomic_dec(&net->ct.count); |
5d0aa2cc PM |
748 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
749 | return ERR_PTR(-ENOMEM); | |
750 | #endif | |
9fb9cbb1 | 751 | } |
99f07e91 CG |
752 | |
753 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, | |
754 | const struct nf_conntrack_tuple *orig, | |
755 | const struct nf_conntrack_tuple *repl, | |
756 | gfp_t gfp) | |
757 | { | |
758 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); | |
759 | } | |
13b18339 | 760 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb1 | 761 | |
c88130bc | 762 | void nf_conntrack_free(struct nf_conn *ct) |
76507f69 | 763 | { |
1d45209d ED |
764 | struct net *net = nf_ct_net(ct); |
765 | ||
ceeff754 | 766 | nf_ct_ext_destroy(ct); |
1d45209d | 767 | atomic_dec(&net->ct.count); |
ea781f19 | 768 | nf_ct_ext_free(ct); |
5b3501fa | 769 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
76507f69 | 770 | } |
13b18339 | 771 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb1 | 772 | |
c539f017 | 773 | |
9fb9cbb1 YK |
774 | /* Allocate a new conntrack: we return -ENOMEM if classification |
775 | failed due to stress. Otherwise it really is unclassifiable. */ | |
776 | static struct nf_conntrack_tuple_hash * | |
b2a15a60 | 777 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391 | 778 | const struct nf_conntrack_tuple *tuple, |
9fb9cbb1 | 779 | struct nf_conntrack_l3proto *l3proto, |
605dcad6 | 780 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 781 | struct sk_buff *skb, |
60b5f8f7 | 782 | unsigned int dataoff, u32 hash) |
9fb9cbb1 | 783 | { |
c88130bc | 784 | struct nf_conn *ct; |
3c158f7f | 785 | struct nf_conn_help *help; |
9fb9cbb1 | 786 | struct nf_conntrack_tuple repl_tuple; |
b2a15a60 | 787 | struct nf_conntrack_ecache *ecache; |
9fb9cbb1 | 788 | struct nf_conntrack_expect *exp; |
5d0aa2cc | 789 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
60b5f8f7 PNA |
790 | struct nf_conn_timeout *timeout_ext; |
791 | unsigned int *timeouts; | |
9fb9cbb1 | 792 | |
605dcad6 | 793 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e | 794 | pr_debug("Can't invert tuple.\n"); |
9fb9cbb1 YK |
795 | return NULL; |
796 | } | |
797 | ||
99f07e91 CG |
798 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
799 | hash); | |
0a9ee813 | 800 | if (IS_ERR(ct)) |
c88130bc | 801 | return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb1 | 802 | |
48b1de4c PM |
803 | if (tmpl && nfct_synproxy(tmpl)) { |
804 | nfct_seqadj_ext_add(ct); | |
805 | nfct_synproxy_ext_add(ct); | |
806 | } | |
807 | ||
60b5f8f7 PNA |
808 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
809 | if (timeout_ext) | |
810 | timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext); | |
811 | else | |
812 | timeouts = l4proto->get_timeouts(net); | |
813 | ||
2c8503f5 | 814 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
c88130bc | 815 | nf_conntrack_free(ct); |
0d53778e | 816 | pr_debug("init conntrack: can't track with proto module\n"); |
9fb9cbb1 YK |
817 | return NULL; |
818 | } | |
819 | ||
60b5f8f7 PNA |
820 | if (timeout_ext) |
821 | nf_ct_timeout_ext_add(ct, timeout_ext->timeout, GFP_ATOMIC); | |
822 | ||
58401572 | 823 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a | 824 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
c539f017 | 825 | nf_ct_labels_ext_add(ct); |
b2a15a60 PM |
826 | |
827 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; | |
828 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, | |
829 | ecache ? ecache->expmask : 0, | |
830 | GFP_ATOMIC); | |
58401572 | 831 | |
f8ba1aff | 832 | spin_lock_bh(&nf_conntrack_lock); |
5d0aa2cc | 833 | exp = nf_ct_find_expectation(net, zone, tuple); |
9fb9cbb1 | 834 | if (exp) { |
0d53778e | 835 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
c88130bc | 836 | ct, exp); |
9fb9cbb1 | 837 | /* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bc PM |
838 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
839 | ct->master = exp->master; | |
ceceae1b | 840 | if (exp->helper) { |
1afc5679 PNA |
841 | help = nf_ct_helper_ext_add(ct, exp->helper, |
842 | GFP_ATOMIC); | |
ceceae1b | 843 | if (help) |
cf778b00 | 844 | rcu_assign_pointer(help->helper, exp->helper); |
ceceae1b YK |
845 | } |
846 | ||
9fb9cbb1 | 847 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bc | 848 | ct->mark = exp->master->mark; |
7c9728c3 JM |
849 | #endif |
850 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
c88130bc | 851 | ct->secmark = exp->master->secmark; |
9fb9cbb1 | 852 | #endif |
c88130bc | 853 | nf_conntrack_get(&ct->master->ct_general); |
0d55af87 | 854 | NF_CT_STAT_INC(net, expect_new); |
22e7410b | 855 | } else { |
b2a15a60 | 856 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af87 | 857 | NF_CT_STAT_INC(net, new); |
22e7410b | 858 | } |
9fb9cbb1 YK |
859 | |
860 | /* Overload tuple linked list to put us in unconfirmed list. */ | |
ea781f19 | 861 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a262 | 862 | &net->ct.unconfirmed); |
9fb9cbb1 | 863 | |
f8ba1aff | 864 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 YK |
865 | |
866 | if (exp) { | |
867 | if (exp->expectfn) | |
c88130bc | 868 | exp->expectfn(ct, exp); |
6823645d | 869 | nf_ct_expect_put(exp); |
9fb9cbb1 YK |
870 | } |
871 | ||
c88130bc | 872 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb1 YK |
873 | } |
874 | ||
875 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ | |
876 | static inline struct nf_conn * | |
b2a15a60 | 877 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65f | 878 | struct sk_buff *skb, |
9fb9cbb1 YK |
879 | unsigned int dataoff, |
880 | u_int16_t l3num, | |
881 | u_int8_t protonum, | |
882 | struct nf_conntrack_l3proto *l3proto, | |
605dcad6 | 883 | struct nf_conntrack_l4proto *l4proto, |
9fb9cbb1 | 884 | int *set_reply, |
60b5f8f7 | 885 | enum ip_conntrack_info *ctinfo) |
9fb9cbb1 YK |
886 | { |
887 | struct nf_conntrack_tuple tuple; | |
888 | struct nf_conntrack_tuple_hash *h; | |
889 | struct nf_conn *ct; | |
5d0aa2cc | 890 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
99f07e91 | 891 | u32 hash; |
9fb9cbb1 | 892 | |
bbe735e4 | 893 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb1 | 894 | dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6 | 895 | l4proto)) { |
0d53778e | 896 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
9fb9cbb1 YK |
897 | return NULL; |
898 | } | |
899 | ||
900 | /* look for tuple match */ | |
99f07e91 CG |
901 | hash = hash_conntrack_raw(&tuple, zone); |
902 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); | |
9fb9cbb1 | 903 | if (!h) { |
b2a15a60 | 904 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
60b5f8f7 | 905 | skb, dataoff, hash); |
9fb9cbb1 YK |
906 | if (!h) |
907 | return NULL; | |
908 | if (IS_ERR(h)) | |
909 | return (void *)h; | |
910 | } | |
911 | ct = nf_ct_tuplehash_to_ctrack(h); | |
912 | ||
913 | /* It exists; we have (non-exclusive) reference. */ | |
914 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { | |
fb048833 | 915 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb1 YK |
916 | /* Please set reply bit if this packet OK */ |
917 | *set_reply = 1; | |
918 | } else { | |
919 | /* Once we've had two way comms, always ESTABLISHED. */ | |
920 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
0d53778e | 921 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
9fb9cbb1 YK |
922 | *ctinfo = IP_CT_ESTABLISHED; |
923 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { | |
0d53778e PM |
924 | pr_debug("nf_conntrack_in: related packet for %p\n", |
925 | ct); | |
9fb9cbb1 YK |
926 | *ctinfo = IP_CT_RELATED; |
927 | } else { | |
0d53778e | 928 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
9fb9cbb1 YK |
929 | *ctinfo = IP_CT_NEW; |
930 | } | |
931 | *set_reply = 0; | |
932 | } | |
933 | skb->nfct = &ct->ct_general; | |
934 | skb->nfctinfo = *ctinfo; | |
935 | return ct; | |
936 | } | |
937 | ||
938 | unsigned int | |
a702a65f AD |
939 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
940 | struct sk_buff *skb) | |
9fb9cbb1 | 941 | { |
b2a15a60 | 942 | struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb1 YK |
943 | enum ip_conntrack_info ctinfo; |
944 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 945 | struct nf_conntrack_l4proto *l4proto; |
2c8503f5 | 946 | unsigned int *timeouts; |
9fb9cbb1 YK |
947 | unsigned int dataoff; |
948 | u_int8_t protonum; | |
949 | int set_reply = 0; | |
950 | int ret; | |
951 | ||
3db05fea | 952 | if (skb->nfct) { |
b2a15a60 PM |
953 | /* Previously seen (loopback or untracked)? Ignore. */ |
954 | tmpl = (struct nf_conn *)skb->nfct; | |
955 | if (!nf_ct_is_template(tmpl)) { | |
956 | NF_CT_STAT_INC_ATOMIC(net, ignore); | |
957 | return NF_ACCEPT; | |
958 | } | |
959 | skb->nfct = NULL; | |
9fb9cbb1 YK |
960 | } |
961 | ||
923f4902 | 962 | /* rcu_read_lock()ed by nf_hook_slow */ |
76108cea | 963 | l3proto = __nf_ct_l3proto_find(pf); |
3db05fea | 964 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc30690 YK |
965 | &dataoff, &protonum); |
966 | if (ret <= 0) { | |
25985edc | 967 | pr_debug("not prepared to track yet or error occurred\n"); |
0d55af87 AD |
968 | NF_CT_STAT_INC_ATOMIC(net, error); |
969 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
970 | ret = -ret; |
971 | goto out; | |
9fb9cbb1 YK |
972 | } |
973 | ||
76108cea | 974 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb1 YK |
975 | |
976 | /* It may be an special packet, error, unclean... | |
977 | * inverse of the return code tells to the netfilter | |
978 | * core what to do with the packet. */ | |
74c51a14 | 979 | if (l4proto->error != NULL) { |
8fea97ec PM |
980 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
981 | pf, hooknum); | |
74c51a14 | 982 | if (ret <= 0) { |
0d55af87 AD |
983 | NF_CT_STAT_INC_ATOMIC(net, error); |
984 | NF_CT_STAT_INC_ATOMIC(net, invalid); | |
b2a15a60 PM |
985 | ret = -ret; |
986 | goto out; | |
74c51a14 | 987 | } |
88ed01d1 PNA |
988 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
989 | if (skb->nfct) | |
990 | goto out; | |
9fb9cbb1 YK |
991 | } |
992 | ||
b2a15a60 | 993 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
60b5f8f7 | 994 | l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb1 YK |
995 | if (!ct) { |
996 | /* Not valid part of a connection */ | |
0d55af87 | 997 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a60 PM |
998 | ret = NF_ACCEPT; |
999 | goto out; | |
9fb9cbb1 YK |
1000 | } |
1001 | ||
1002 | if (IS_ERR(ct)) { | |
1003 | /* Too stressed to deal. */ | |
0d55af87 | 1004 | NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a60 PM |
1005 | ret = NF_DROP; |
1006 | goto out; | |
9fb9cbb1 YK |
1007 | } |
1008 | ||
3db05fea | 1009 | NF_CT_ASSERT(skb->nfct); |
9fb9cbb1 | 1010 | |
60b5f8f7 | 1011 | /* Decide what timeout policy we want to apply to this flow. */ |
84b5ee93 | 1012 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
60b5f8f7 | 1013 | |
2c8503f5 | 1014 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
ec8d5409 | 1015 | if (ret <= 0) { |
9fb9cbb1 YK |
1016 | /* Invalid: inverse of the return code tells |
1017 | * the netfilter core what to do */ | |
0d53778e | 1018 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
3db05fea HX |
1019 | nf_conntrack_put(skb->nfct); |
1020 | skb->nfct = NULL; | |
0d55af87 | 1021 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e0459 PNA |
1022 | if (ret == -NF_DROP) |
1023 | NF_CT_STAT_INC_ATOMIC(net, drop); | |
b2a15a60 PM |
1024 | ret = -ret; |
1025 | goto out; | |
9fb9cbb1 YK |
1026 | } |
1027 | ||
1028 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
858b3133 | 1029 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a60 | 1030 | out: |
c3174286 PNA |
1031 | if (tmpl) { |
1032 | /* Special case: we have to repeat this hook, assign the | |
1033 | * template again to this packet. We assume that this packet | |
1034 | * has no conntrack assigned. This is used by nf_ct_tcp. */ | |
1035 | if (ret == NF_REPEAT) | |
1036 | skb->nfct = (struct nf_conntrack *)tmpl; | |
1037 | else | |
1038 | nf_ct_put(tmpl); | |
1039 | } | |
9fb9cbb1 YK |
1040 | |
1041 | return ret; | |
1042 | } | |
13b18339 | 1043 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb1 | 1044 | |
5f2b4c90 JE |
1045 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
1046 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 1047 | { |
5f2b4c90 | 1048 | bool ret; |
923f4902 PM |
1049 | |
1050 | rcu_read_lock(); | |
1051 | ret = nf_ct_invert_tuple(inverse, orig, | |
1052 | __nf_ct_l3proto_find(orig->src.l3num), | |
1053 | __nf_ct_l4proto_find(orig->src.l3num, | |
1054 | orig->dst.protonum)); | |
1055 | rcu_read_unlock(); | |
1056 | return ret; | |
9fb9cbb1 | 1057 | } |
13b18339 | 1058 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb1 | 1059 | |
5b1158e9 JK |
1060 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
1061 | implicitly racy: see __nf_conntrack_confirm */ | |
1062 | void nf_conntrack_alter_reply(struct nf_conn *ct, | |
1063 | const struct nf_conntrack_tuple *newreply) | |
1064 | { | |
1065 | struct nf_conn_help *help = nfct_help(ct); | |
1066 | ||
5b1158e9 JK |
1067 | /* Should be unconfirmed, so not in hash table yet */ |
1068 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); | |
1069 | ||
0d53778e | 1070 | pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba65 | 1071 | nf_ct_dump_tuple(newreply); |
5b1158e9 JK |
1072 | |
1073 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; | |
ef1a5a50 | 1074 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb41 | 1075 | return; |
ceceae1b | 1076 | |
c52fbb41 | 1077 | rcu_read_lock(); |
b2a15a60 | 1078 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb41 | 1079 | rcu_read_unlock(); |
5b1158e9 | 1080 | } |
13b18339 | 1081 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e9 | 1082 | |
9fb9cbb1 YK |
1083 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
1084 | void __nf_ct_refresh_acct(struct nf_conn *ct, | |
1085 | enum ip_conntrack_info ctinfo, | |
1086 | const struct sk_buff *skb, | |
1087 | unsigned long extra_jiffies, | |
1088 | int do_acct) | |
1089 | { | |
9fb9cbb1 YK |
1090 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
1091 | NF_CT_ASSERT(skb); | |
1092 | ||
997ae831 | 1093 | /* Only update if this is not a fixed timeout */ |
47d95045 PM |
1094 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
1095 | goto acct; | |
997ae831 | 1096 | |
9fb9cbb1 YK |
1097 | /* If not in hash table, timer will not be active yet */ |
1098 | if (!nf_ct_is_confirmed(ct)) { | |
1099 | ct->timeout.expires = extra_jiffies; | |
9fb9cbb1 | 1100 | } else { |
be00c8e4 MJ |
1101 | unsigned long newtime = jiffies + extra_jiffies; |
1102 | ||
1103 | /* Only update the timeout if the new timeout is at least | |
1104 | HZ jiffies from the old timeout. Need del_timer for race | |
1105 | avoidance (may already be dying). */ | |
65cb9fda PM |
1106 | if (newtime - ct->timeout.expires >= HZ) |
1107 | mod_timer_pending(&ct->timeout, newtime); | |
9fb9cbb1 YK |
1108 | } |
1109 | ||
47d95045 | 1110 | acct: |
9fb9cbb1 | 1111 | if (do_acct) { |
58401572 | 1112 | struct nf_conn_counter *acct; |
3ffd5eeb | 1113 | |
58401572 KPO |
1114 | acct = nf_conn_acct_find(ct); |
1115 | if (acct) { | |
b3e0bfa7 ED |
1116 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1117 | atomic64_add(skb->len, &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1118 | } |
9fb9cbb1 | 1119 | } |
9fb9cbb1 | 1120 | } |
13b18339 | 1121 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb1 | 1122 | |
4c889498 DM |
1123 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
1124 | enum ip_conntrack_info ctinfo, | |
1125 | const struct sk_buff *skb, | |
1126 | int do_acct) | |
51091764 | 1127 | { |
718d4ad9 | 1128 | if (do_acct) { |
58401572 KPO |
1129 | struct nf_conn_counter *acct; |
1130 | ||
58401572 KPO |
1131 | acct = nf_conn_acct_find(ct); |
1132 | if (acct) { | |
b3e0bfa7 ED |
1133 | atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); |
1134 | atomic64_add(skb->len - skb_network_offset(skb), | |
1135 | &acct[CTINFO2DIR(ctinfo)].bytes); | |
58401572 | 1136 | } |
718d4ad9 | 1137 | } |
58401572 | 1138 | |
4c889498 | 1139 | if (del_timer(&ct->timeout)) { |
51091764 | 1140 | ct->timeout.function((unsigned long)ct); |
4c889498 DM |
1141 | return true; |
1142 | } | |
1143 | return false; | |
51091764 | 1144 | } |
718d4ad9 | 1145 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764 | 1146 | |
5d0aa2cc PM |
1147 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1148 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { | |
1149 | .len = sizeof(struct nf_conntrack_zone), | |
1150 | .align = __alignof__(struct nf_conntrack_zone), | |
1151 | .id = NF_CT_EXT_ZONE, | |
1152 | }; | |
1153 | #endif | |
1154 | ||
c0cd1156 | 1155 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1156 | |
1157 | #include <linux/netfilter/nfnetlink.h> | |
1158 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
57b47a53 IM |
1159 | #include <linux/mutex.h> |
1160 | ||
c1d10adb PNA |
1161 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
1162 | * in ip_conntrack_core, since we don't want the protocols to autoload | |
1163 | * or depend on ctnetlink */ | |
fdf70832 | 1164 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
1165 | const struct nf_conntrack_tuple *tuple) |
1166 | { | |
bae65be8 DM |
1167 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
1168 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) | |
1169 | goto nla_put_failure; | |
c1d10adb PNA |
1170 | return 0; |
1171 | ||
df6fb868 | 1172 | nla_put_failure: |
c1d10adb PNA |
1173 | return -1; |
1174 | } | |
fdf70832 | 1175 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb | 1176 | |
f73e924c PM |
1177 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
1178 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, | |
1179 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, | |
c1d10adb | 1180 | }; |
f73e924c | 1181 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb | 1182 | |
fdf70832 | 1183 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
1184 | struct nf_conntrack_tuple *t) |
1185 | { | |
df6fb868 | 1186 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb PNA |
1187 | return -EINVAL; |
1188 | ||
77236b6e PM |
1189 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
1190 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); | |
c1d10adb PNA |
1191 | |
1192 | return 0; | |
1193 | } | |
fdf70832 | 1194 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d HE |
1195 | |
1196 | int nf_ct_port_nlattr_tuple_size(void) | |
1197 | { | |
1198 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); | |
c1d10adb PNA |
1201 | #endif |
1202 | ||
9fb9cbb1 | 1203 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
312a0c16 | 1204 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
9fb9cbb1 YK |
1205 | { |
1206 | struct nf_conn *ct; | |
1207 | enum ip_conntrack_info ctinfo; | |
1208 | ||
1209 | /* This ICMP is in reverse direction to the packet which caused it */ | |
1210 | ct = nf_ct_get(skb, &ctinfo); | |
1211 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) | |
fb048833 | 1212 | ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb1 YK |
1213 | else |
1214 | ctinfo = IP_CT_RELATED; | |
1215 | ||
1216 | /* Attach to new skbuff, and increment count */ | |
1217 | nskb->nfct = &ct->ct_general; | |
1218 | nskb->nfctinfo = ctinfo; | |
1219 | nf_conntrack_get(nskb->nfct); | |
1220 | } | |
1221 | ||
9fb9cbb1 | 1222 | /* Bring out ya dead! */ |
df0933dc | 1223 | static struct nf_conn * |
400dad39 | 1224 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb1 YK |
1225 | void *data, unsigned int *bucket) |
1226 | { | |
df0933dc PM |
1227 | struct nf_conntrack_tuple_hash *h; |
1228 | struct nf_conn *ct; | |
ea781f19 | 1229 | struct hlist_nulls_node *n; |
9fb9cbb1 | 1230 | |
f8ba1aff | 1231 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1232 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
ea781f19 | 1233 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
b0cdb1d9 PM |
1234 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1235 | continue; | |
df0933dc PM |
1236 | ct = nf_ct_tuplehash_to_ctrack(h); |
1237 | if (iter(ct, data)) | |
1238 | goto found; | |
1239 | } | |
601e68e1 | 1240 | } |
ea781f19 | 1241 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dc PM |
1242 | ct = nf_ct_tuplehash_to_ctrack(h); |
1243 | if (iter(ct, data)) | |
ec68e97d | 1244 | set_bit(IPS_DYING_BIT, &ct->status); |
df0933dc | 1245 | } |
f8ba1aff | 1246 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc PM |
1247 | return NULL; |
1248 | found: | |
c073e3fa | 1249 | atomic_inc(&ct->ct_general.use); |
f8ba1aff | 1250 | spin_unlock_bh(&nf_conntrack_lock); |
df0933dc | 1251 | return ct; |
9fb9cbb1 YK |
1252 | } |
1253 | ||
400dad39 AD |
1254 | void nf_ct_iterate_cleanup(struct net *net, |
1255 | int (*iter)(struct nf_conn *i, void *data), | |
c655bc68 | 1256 | void *data, u32 portid, int report) |
9fb9cbb1 | 1257 | { |
df0933dc | 1258 | struct nf_conn *ct; |
9fb9cbb1 YK |
1259 | unsigned int bucket = 0; |
1260 | ||
400dad39 | 1261 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb1 YK |
1262 | /* Time to push up daises... */ |
1263 | if (del_timer(&ct->timeout)) | |
c655bc68 | 1264 | nf_ct_delete(ct, portid, report); |
02982c27 | 1265 | |
9fb9cbb1 YK |
1266 | /* ... else the timer will get him soon. */ |
1267 | ||
1268 | nf_ct_put(ct); | |
1269 | } | |
1270 | } | |
13b18339 | 1271 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb1 | 1272 | |
274d383b PNA |
1273 | static int kill_all(struct nf_conn *i, void *data) |
1274 | { | |
1275 | return 1; | |
1276 | } | |
1277 | ||
d862a662 | 1278 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb1 | 1279 | { |
d862a662 | 1280 | if (is_vmalloc_addr(hash)) |
9fb9cbb1 YK |
1281 | vfree(hash); |
1282 | else | |
601e68e1 | 1283 | free_pages((unsigned long)hash, |
f205c5e0 | 1284 | get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb1 | 1285 | } |
ac565e5f | 1286 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb1 | 1287 | |
ec464e5d | 1288 | void nf_conntrack_flush_report(struct net *net, u32 portid, int report) |
c1d10adb | 1289 | { |
c655bc68 | 1290 | nf_ct_iterate_cleanup(net, kill_all, NULL, portid, report); |
c1d10adb | 1291 | } |
274d383b | 1292 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb | 1293 | |
ee254fa4 | 1294 | static void nf_ct_release_dying_list(struct net *net) |
dd7669a9 PNA |
1295 | { |
1296 | struct nf_conntrack_tuple_hash *h; | |
1297 | struct nf_conn *ct; | |
1298 | struct hlist_nulls_node *n; | |
1299 | ||
1300 | spin_lock_bh(&nf_conntrack_lock); | |
ee254fa4 | 1301 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a9 PNA |
1302 | ct = nf_ct_tuplehash_to_ctrack(h); |
1303 | /* never fails to remove them, no listeners at this point */ | |
1304 | nf_ct_kill(ct); | |
1305 | } | |
1306 | spin_unlock_bh(&nf_conntrack_lock); | |
1307 | } | |
1308 | ||
b3c5163f ED |
1309 | static int untrack_refs(void) |
1310 | { | |
1311 | int cnt = 0, cpu; | |
1312 | ||
1313 | for_each_possible_cpu(cpu) { | |
1314 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
1315 | ||
1316 | cnt += atomic_read(&ct->ct_general.use) - 1; | |
1317 | } | |
1318 | return cnt; | |
1319 | } | |
1320 | ||
f94161c1 | 1321 | void nf_conntrack_cleanup_start(void) |
9fb9cbb1 | 1322 | { |
f94161c1 G |
1323 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
1324 | } | |
1325 | ||
1326 | void nf_conntrack_cleanup_end(void) | |
1327 | { | |
1328 | RCU_INIT_POINTER(nf_ct_destroy, NULL); | |
b3c5163f | 1329 | while (untrack_refs() > 0) |
9edd7ca0 PM |
1330 | schedule(); |
1331 | ||
5d0aa2cc PM |
1332 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1333 | nf_ct_extend_unregister(&nf_ct_zone_extend); | |
1334 | #endif | |
04d87001 | 1335 | nf_conntrack_proto_fini(); |
41d73ec0 | 1336 | nf_conntrack_seqadj_fini(); |
5f69b8f5 | 1337 | nf_conntrack_labels_fini(); |
5e615b22 | 1338 | nf_conntrack_helper_fini(); |
8684094c | 1339 | nf_conntrack_timeout_fini(); |
3fe0f943 | 1340 | nf_conntrack_ecache_fini(); |
73f4001a | 1341 | nf_conntrack_tstamp_fini(); |
b7ff3a1f | 1342 | nf_conntrack_acct_fini(); |
83b4dbe1 | 1343 | nf_conntrack_expect_fini(); |
08f6547d | 1344 | } |
9fb9cbb1 | 1345 | |
f94161c1 G |
1346 | /* |
1347 | * Mishearing the voices in his head, our hero wonders how he's | |
1348 | * supposed to kill the mall. | |
1349 | */ | |
1350 | void nf_conntrack_cleanup_net(struct net *net) | |
08f6547d | 1351 | { |
dece40e8 VD |
1352 | LIST_HEAD(single); |
1353 | ||
1354 | list_add(&net->exit_list, &single); | |
1355 | nf_conntrack_cleanup_net_list(&single); | |
1356 | } | |
1357 | ||
1358 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) | |
1359 | { | |
1360 | int busy; | |
1361 | struct net *net; | |
1362 | ||
f94161c1 G |
1363 | /* |
1364 | * This makes sure all current packets have passed through | |
1365 | * netfilter framework. Roll on, two-stage module | |
1366 | * delete... | |
1367 | */ | |
1368 | synchronize_net(); | |
dece40e8 VD |
1369 | i_see_dead_people: |
1370 | busy = 0; | |
1371 | list_for_each_entry(net, net_exit_list, exit_list) { | |
c655bc68 | 1372 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
dece40e8 VD |
1373 | nf_ct_release_dying_list(net); |
1374 | if (atomic_read(&net->ct.count) != 0) | |
1375 | busy = 1; | |
1376 | } | |
1377 | if (busy) { | |
9fb9cbb1 YK |
1378 | schedule(); |
1379 | goto i_see_dead_people; | |
1380 | } | |
1381 | ||
dece40e8 VD |
1382 | list_for_each_entry(net, net_exit_list, exit_list) { |
1383 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); | |
1384 | nf_conntrack_proto_pernet_fini(net); | |
1385 | nf_conntrack_helper_pernet_fini(net); | |
1386 | nf_conntrack_ecache_pernet_fini(net); | |
1387 | nf_conntrack_tstamp_pernet_fini(net); | |
1388 | nf_conntrack_acct_pernet_fini(net); | |
1389 | nf_conntrack_expect_pernet_fini(net); | |
1390 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); | |
1391 | kfree(net->ct.slabname); | |
1392 | free_percpu(net->ct.stat); | |
1393 | } | |
08f6547d AD |
1394 | } |
1395 | ||
d862a662 | 1396 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb1 | 1397 | { |
ea781f19 ED |
1398 | struct hlist_nulls_head *hash; |
1399 | unsigned int nr_slots, i; | |
1400 | size_t sz; | |
9fb9cbb1 | 1401 | |
ea781f19 ED |
1402 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
1403 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); | |
1404 | sz = nr_slots * sizeof(struct hlist_nulls_head); | |
1405 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, | |
1406 | get_order(sz)); | |
601e68e1 | 1407 | if (!hash) { |
9fb9cbb1 | 1408 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
966567b7 | 1409 | hash = vzalloc(sz); |
9fb9cbb1 YK |
1410 | } |
1411 | ||
ea781f19 ED |
1412 | if (hash && nulls) |
1413 | for (i = 0; i < nr_slots; i++) | |
1414 | INIT_HLIST_NULLS_HEAD(&hash[i], i); | |
9fb9cbb1 YK |
1415 | |
1416 | return hash; | |
1417 | } | |
ac565e5f | 1418 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb1 | 1419 | |
fae718dd | 1420 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb1 | 1421 | { |
4b5511eb | 1422 | int i, bucket, rc; |
96eb24d7 | 1423 | unsigned int hashsize, old_size; |
ea781f19 | 1424 | struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb1 | 1425 | struct nf_conntrack_tuple_hash *h; |
5d0aa2cc | 1426 | struct nf_conn *ct; |
9fb9cbb1 | 1427 | |
d696c7bd PM |
1428 | if (current->nsproxy->net_ns != &init_net) |
1429 | return -EOPNOTSUPP; | |
1430 | ||
9fb9cbb1 YK |
1431 | /* On boot, we can set this without any fancy locking. */ |
1432 | if (!nf_conntrack_htable_size) | |
1433 | return param_set_uint(val, kp); | |
1434 | ||
4b5511eb AP |
1435 | rc = kstrtouint(val, 0, &hashsize); |
1436 | if (rc) | |
1437 | return rc; | |
9fb9cbb1 YK |
1438 | if (!hashsize) |
1439 | return -EINVAL; | |
1440 | ||
d862a662 | 1441 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb1 YK |
1442 | if (!hash) |
1443 | return -ENOMEM; | |
1444 | ||
76507f69 PM |
1445 | /* Lookups in the old hash might happen in parallel, which means we |
1446 | * might get false negatives during connection lookup. New connections | |
1447 | * created because of a false negative won't make it into the hash | |
1448 | * though since that required taking the lock. | |
1449 | */ | |
f8ba1aff | 1450 | spin_lock_bh(&nf_conntrack_lock); |
d696c7bd | 1451 | for (i = 0; i < init_net.ct.htable_size; i++) { |
ea781f19 ED |
1452 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
1453 | h = hlist_nulls_entry(init_net.ct.hash[i].first, | |
1454 | struct nf_conntrack_tuple_hash, hnnode); | |
5d0aa2cc | 1455 | ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f19 | 1456 | hlist_nulls_del_rcu(&h->hnnode); |
5d0aa2cc | 1457 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
99f07e91 | 1458 | hashsize); |
ea781f19 | 1459 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb1 YK |
1460 | } |
1461 | } | |
d696c7bd | 1462 | old_size = init_net.ct.htable_size; |
400dad39 | 1463 | old_hash = init_net.ct.hash; |
9fb9cbb1 | 1464 | |
d696c7bd | 1465 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
400dad39 | 1466 | init_net.ct.hash = hash; |
f8ba1aff | 1467 | spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb1 | 1468 | |
d862a662 | 1469 | nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb1 YK |
1470 | return 0; |
1471 | } | |
fae718dd | 1472 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb1 | 1473 | |
fae718dd | 1474 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb1 YK |
1475 | &nf_conntrack_htable_size, 0600); |
1476 | ||
5bfddbd4 ED |
1477 | void nf_ct_untracked_status_or(unsigned long bits) |
1478 | { | |
b3c5163f ED |
1479 | int cpu; |
1480 | ||
1481 | for_each_possible_cpu(cpu) | |
1482 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; | |
5bfddbd4 ED |
1483 | } |
1484 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); | |
1485 | ||
f94161c1 | 1486 | int nf_conntrack_init_start(void) |
9fb9cbb1 | 1487 | { |
f205c5e0 | 1488 | int max_factor = 8; |
b3c5163f | 1489 | int ret, cpu; |
9fb9cbb1 YK |
1490 | |
1491 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB | |
f205c5e0 | 1492 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb1 YK |
1493 | if (!nf_conntrack_htable_size) { |
1494 | nf_conntrack_htable_size | |
4481374c | 1495 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0 | 1496 | / sizeof(struct hlist_head)); |
4481374c | 1497 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0 PM |
1498 | nf_conntrack_htable_size = 16384; |
1499 | if (nf_conntrack_htable_size < 32) | |
1500 | nf_conntrack_htable_size = 32; | |
1501 | ||
1502 | /* Use a max. factor of four by default to get the same max as | |
1503 | * with the old struct list_heads. When a table size is given | |
1504 | * we use the old value of 8 to avoid reducing the max. | |
1505 | * entries. */ | |
1506 | max_factor = 4; | |
9fb9cbb1 | 1507 | } |
f205c5e0 | 1508 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0 | 1509 | |
654d0fbd | 1510 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
8e5105a0 PM |
1511 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
1512 | nf_conntrack_max); | |
83b4dbe1 G |
1513 | |
1514 | ret = nf_conntrack_expect_init(); | |
1515 | if (ret < 0) | |
1516 | goto err_expect; | |
1517 | ||
b7ff3a1f G |
1518 | ret = nf_conntrack_acct_init(); |
1519 | if (ret < 0) | |
1520 | goto err_acct; | |
1521 | ||
73f4001a G |
1522 | ret = nf_conntrack_tstamp_init(); |
1523 | if (ret < 0) | |
1524 | goto err_tstamp; | |
1525 | ||
3fe0f943 G |
1526 | ret = nf_conntrack_ecache_init(); |
1527 | if (ret < 0) | |
1528 | goto err_ecache; | |
1529 | ||
8684094c G |
1530 | ret = nf_conntrack_timeout_init(); |
1531 | if (ret < 0) | |
1532 | goto err_timeout; | |
1533 | ||
5e615b22 G |
1534 | ret = nf_conntrack_helper_init(); |
1535 | if (ret < 0) | |
1536 | goto err_helper; | |
1537 | ||
5f69b8f5 G |
1538 | ret = nf_conntrack_labels_init(); |
1539 | if (ret < 0) | |
1540 | goto err_labels; | |
1541 | ||
41d73ec0 PM |
1542 | ret = nf_conntrack_seqadj_init(); |
1543 | if (ret < 0) | |
1544 | goto err_seqadj; | |
1545 | ||
5d0aa2cc PM |
1546 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1547 | ret = nf_ct_extend_register(&nf_ct_zone_extend); | |
1548 | if (ret < 0) | |
1549 | goto err_extend; | |
1550 | #endif | |
04d87001 G |
1551 | ret = nf_conntrack_proto_init(); |
1552 | if (ret < 0) | |
1553 | goto err_proto; | |
1554 | ||
9edd7ca0 | 1555 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163f ED |
1556 | for_each_possible_cpu(cpu) { |
1557 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); | |
b3c5163f ED |
1558 | write_pnet(&ct->ct_net, &init_net); |
1559 | atomic_set(&ct->ct_general.use, 1); | |
1560 | } | |
9edd7ca0 | 1561 | /* - and look it like as a confirmed connection */ |
5bfddbd4 | 1562 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d AD |
1563 | return 0; |
1564 | ||
04d87001 | 1565 | err_proto: |
5d0aa2cc | 1566 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
04d87001 | 1567 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
5d0aa2cc | 1568 | err_extend: |
a9006892 | 1569 | #endif |
41d73ec0 PM |
1570 | nf_conntrack_seqadj_fini(); |
1571 | err_seqadj: | |
04d87001 | 1572 | nf_conntrack_labels_fini(); |
5f69b8f5 G |
1573 | err_labels: |
1574 | nf_conntrack_helper_fini(); | |
5e615b22 G |
1575 | err_helper: |
1576 | nf_conntrack_timeout_fini(); | |
8684094c G |
1577 | err_timeout: |
1578 | nf_conntrack_ecache_fini(); | |
3fe0f943 G |
1579 | err_ecache: |
1580 | nf_conntrack_tstamp_fini(); | |
73f4001a G |
1581 | err_tstamp: |
1582 | nf_conntrack_acct_fini(); | |
b7ff3a1f G |
1583 | err_acct: |
1584 | nf_conntrack_expect_fini(); | |
83b4dbe1 | 1585 | err_expect: |
08f6547d AD |
1586 | return ret; |
1587 | } | |
1588 | ||
f94161c1 G |
1589 | void nf_conntrack_init_end(void) |
1590 | { | |
1591 | /* For use by REJECT target */ | |
1592 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); | |
1593 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); | |
f94161c1 G |
1594 | } |
1595 | ||
8cc20198 ED |
1596 | /* |
1597 | * We need to use special "null" values, not used in hash table | |
1598 | */ | |
1599 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) | |
1600 | #define DYING_NULLS_VAL ((1<<30)+1) | |
252b3e8c | 1601 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
8cc20198 | 1602 | |
f94161c1 | 1603 | int nf_conntrack_init_net(struct net *net) |
08f6547d AD |
1604 | { |
1605 | int ret; | |
ceceae1b | 1606 | |
08f6547d | 1607 | atomic_set(&net->ct.count, 0); |
8cc20198 ED |
1608 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
1609 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); | |
252b3e8c | 1610 | INIT_HLIST_NULLS_HEAD(&net->ct.tmpl, TEMPLATE_NULLS_VAL); |
08f6547d AD |
1611 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
1612 | if (!net->ct.stat) { | |
1613 | ret = -ENOMEM; | |
1614 | goto err_stat; | |
1615 | } | |
5b3501fa ED |
1616 | |
1617 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); | |
1618 | if (!net->ct.slabname) { | |
1619 | ret = -ENOMEM; | |
1620 | goto err_slabname; | |
1621 | } | |
1622 | ||
1623 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, | |
1624 | sizeof(struct nf_conn), 0, | |
1625 | SLAB_DESTROY_BY_RCU, NULL); | |
1626 | if (!net->ct.nf_conntrack_cachep) { | |
1627 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); | |
1628 | ret = -ENOMEM; | |
1629 | goto err_cache; | |
1630 | } | |
d696c7bd PM |
1631 | |
1632 | net->ct.htable_size = nf_conntrack_htable_size; | |
d862a662 | 1633 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
08f6547d AD |
1634 | if (!net->ct.hash) { |
1635 | ret = -ENOMEM; | |
1636 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); | |
1637 | goto err_hash; | |
1638 | } | |
83b4dbe1 | 1639 | ret = nf_conntrack_expect_pernet_init(net); |
08f6547d AD |
1640 | if (ret < 0) |
1641 | goto err_expect; | |
b7ff3a1f | 1642 | ret = nf_conntrack_acct_pernet_init(net); |
58401572 | 1643 | if (ret < 0) |
08f6547d | 1644 | goto err_acct; |
73f4001a | 1645 | ret = nf_conntrack_tstamp_pernet_init(net); |
a992ca2a PNA |
1646 | if (ret < 0) |
1647 | goto err_tstamp; | |
3fe0f943 | 1648 | ret = nf_conntrack_ecache_pernet_init(net); |
a0891aa6 PNA |
1649 | if (ret < 0) |
1650 | goto err_ecache; | |
5e615b22 | 1651 | ret = nf_conntrack_helper_pernet_init(net); |
a9006892 EL |
1652 | if (ret < 0) |
1653 | goto err_helper; | |
04d87001 | 1654 | ret = nf_conntrack_proto_pernet_init(net); |
f94161c1 G |
1655 | if (ret < 0) |
1656 | goto err_proto; | |
08f6547d | 1657 | return 0; |
c539f017 | 1658 | |
f94161c1 | 1659 | err_proto: |
5e615b22 | 1660 | nf_conntrack_helper_pernet_fini(net); |
a9006892 | 1661 | err_helper: |
3fe0f943 | 1662 | nf_conntrack_ecache_pernet_fini(net); |
a0891aa6 | 1663 | err_ecache: |
73f4001a | 1664 | nf_conntrack_tstamp_pernet_fini(net); |
a992ca2a | 1665 | err_tstamp: |
b7ff3a1f | 1666 | nf_conntrack_acct_pernet_fini(net); |
08f6547d | 1667 | err_acct: |
83b4dbe1 | 1668 | nf_conntrack_expect_pernet_fini(net); |
08f6547d | 1669 | err_expect: |
d862a662 | 1670 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
6058fa6b | 1671 | err_hash: |
5b3501fa ED |
1672 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
1673 | err_cache: | |
1674 | kfree(net->ct.slabname); | |
1675 | err_slabname: | |
0d55af87 AD |
1676 | free_percpu(net->ct.stat); |
1677 | err_stat: | |
08f6547d AD |
1678 | return ret; |
1679 | } |