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Commit | Line | Data |
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77ab9cff MJ |
1 | /* Expectation handling for nf_conntrack. */ |
2 | ||
3 | /* (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> | |
f229f6ce | 6 | * (c) 2005-2012 Patrick McHardy <kaber@trash.net> |
77ab9cff MJ |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/netfilter.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/stddef.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/percpu.h> | |
22 | #include <linux/kernel.h> | |
a71c0855 | 23 | #include <linux/jhash.h> |
d9b93842 | 24 | #include <linux/moduleparam.h> |
bc3b2d7f | 25 | #include <linux/export.h> |
457c4cbc | 26 | #include <net/net_namespace.h> |
77ab9cff MJ |
27 | |
28 | #include <net/netfilter/nf_conntrack.h> | |
29 | #include <net/netfilter/nf_conntrack_core.h> | |
30 | #include <net/netfilter/nf_conntrack_expect.h> | |
31 | #include <net/netfilter/nf_conntrack_helper.h> | |
32 | #include <net/netfilter/nf_conntrack_tuple.h> | |
5d0aa2cc | 33 | #include <net/netfilter/nf_conntrack_zones.h> |
77ab9cff | 34 | |
a71c0855 PM |
35 | unsigned int nf_ct_expect_hsize __read_mostly; |
36 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); | |
37 | ||
f264a7df | 38 | unsigned int nf_ct_expect_max __read_mostly; |
a71c0855 | 39 | |
e9c1b084 | 40 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
77ab9cff MJ |
41 | |
42 | /* nf_conntrack_expect helper functions */ | |
ebbf41df | 43 | void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp, |
ec464e5d | 44 | u32 portid, int report) |
77ab9cff MJ |
45 | { |
46 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
9b03f38d | 47 | struct net *net = nf_ct_exp_net(exp); |
77ab9cff | 48 | |
3d058d7b | 49 | NF_CT_ASSERT(master_help); |
77ab9cff MJ |
50 | NF_CT_ASSERT(!timer_pending(&exp->timeout)); |
51 | ||
7d0742da | 52 | hlist_del_rcu(&exp->hnode); |
9b03f38d | 53 | net->ct.expect_count--; |
a71c0855 | 54 | |
b560580a | 55 | hlist_del(&exp->lnode); |
3d058d7b | 56 | master_help->expecting[exp->class]--; |
bc01befd | 57 | |
ec464e5d | 58 | nf_ct_expect_event_report(IPEXP_DESTROY, exp, portid, report); |
6823645d | 59 | nf_ct_expect_put(exp); |
b560580a | 60 | |
0d55af87 | 61 | NF_CT_STAT_INC(net, expect_delete); |
77ab9cff | 62 | } |
ebbf41df | 63 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report); |
77ab9cff | 64 | |
6823645d | 65 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
77ab9cff MJ |
66 | { |
67 | struct nf_conntrack_expect *exp = (void *)ul_expect; | |
68 | ||
f8ba1aff | 69 | spin_lock_bh(&nf_conntrack_lock); |
77ab9cff | 70 | nf_ct_unlink_expect(exp); |
f8ba1aff | 71 | spin_unlock_bh(&nf_conntrack_lock); |
6823645d | 72 | nf_ct_expect_put(exp); |
77ab9cff MJ |
73 | } |
74 | ||
a71c0855 PM |
75 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
76 | { | |
34498825 PM |
77 | unsigned int hash; |
78 | ||
f682cefa CG |
79 | if (unlikely(!nf_conntrack_hash_rnd)) { |
80 | init_nf_conntrack_hash_rnd(); | |
a71c0855 PM |
81 | } |
82 | ||
34498825 | 83 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
a71c0855 | 84 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
f682cefa | 85 | (__force __u16)tuple->dst.u.all) ^ nf_conntrack_hash_rnd); |
34498825 | 86 | return ((u64)hash * nf_ct_expect_hsize) >> 32; |
a71c0855 PM |
87 | } |
88 | ||
77ab9cff | 89 | struct nf_conntrack_expect * |
5d0aa2cc PM |
90 | __nf_ct_expect_find(struct net *net, u16 zone, |
91 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
92 | { |
93 | struct nf_conntrack_expect *i; | |
a71c0855 PM |
94 | unsigned int h; |
95 | ||
9b03f38d | 96 | if (!net->ct.expect_count) |
a71c0855 | 97 | return NULL; |
77ab9cff | 98 | |
a71c0855 | 99 | h = nf_ct_expect_dst_hash(tuple); |
b67bfe0d | 100 | hlist_for_each_entry_rcu(i, &net->ct.expect_hash[h], hnode) { |
5d0aa2cc PM |
101 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
102 | nf_ct_zone(i->master) == zone) | |
77ab9cff MJ |
103 | return i; |
104 | } | |
105 | return NULL; | |
106 | } | |
6823645d | 107 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
77ab9cff MJ |
108 | |
109 | /* Just find a expectation corresponding to a tuple. */ | |
110 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
111 | nf_ct_expect_find_get(struct net *net, u16 zone, |
112 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
113 | { |
114 | struct nf_conntrack_expect *i; | |
115 | ||
7d0742da | 116 | rcu_read_lock(); |
5d0aa2cc | 117 | i = __nf_ct_expect_find(net, zone, tuple); |
7d0742da PM |
118 | if (i && !atomic_inc_not_zero(&i->use)) |
119 | i = NULL; | |
120 | rcu_read_unlock(); | |
77ab9cff MJ |
121 | |
122 | return i; | |
123 | } | |
6823645d | 124 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
77ab9cff MJ |
125 | |
126 | /* If an expectation for this connection is found, it gets delete from | |
127 | * global list then returned. */ | |
128 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
129 | nf_ct_find_expectation(struct net *net, u16 zone, |
130 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff | 131 | { |
359b9ab6 | 132 | struct nf_conntrack_expect *i, *exp = NULL; |
359b9ab6 PM |
133 | unsigned int h; |
134 | ||
9b03f38d | 135 | if (!net->ct.expect_count) |
359b9ab6 | 136 | return NULL; |
ece00641 | 137 | |
359b9ab6 | 138 | h = nf_ct_expect_dst_hash(tuple); |
b67bfe0d | 139 | hlist_for_each_entry(i, &net->ct.expect_hash[h], hnode) { |
359b9ab6 | 140 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
5d0aa2cc PM |
141 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
142 | nf_ct_zone(i->master) == zone) { | |
359b9ab6 PM |
143 | exp = i; |
144 | break; | |
145 | } | |
146 | } | |
ece00641 YK |
147 | if (!exp) |
148 | return NULL; | |
77ab9cff | 149 | |
77ab9cff MJ |
150 | /* If master is not in hash table yet (ie. packet hasn't left |
151 | this machine yet), how can other end know about expected? | |
152 | Hence these are not the droids you are looking for (if | |
153 | master ct never got confirmed, we'd hold a reference to it | |
154 | and weird things would happen to future packets). */ | |
ece00641 YK |
155 | if (!nf_ct_is_confirmed(exp->master)) |
156 | return NULL; | |
157 | ||
158 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { | |
159 | atomic_inc(&exp->use); | |
160 | return exp; | |
161 | } else if (del_timer(&exp->timeout)) { | |
162 | nf_ct_unlink_expect(exp); | |
163 | return exp; | |
77ab9cff | 164 | } |
ece00641 | 165 | |
77ab9cff MJ |
166 | return NULL; |
167 | } | |
168 | ||
169 | /* delete all expectations for this conntrack */ | |
170 | void nf_ct_remove_expectations(struct nf_conn *ct) | |
171 | { | |
77ab9cff | 172 | struct nf_conn_help *help = nfct_help(ct); |
b560580a | 173 | struct nf_conntrack_expect *exp; |
b67bfe0d | 174 | struct hlist_node *next; |
77ab9cff MJ |
175 | |
176 | /* Optimization: most connection never expect any others. */ | |
6002f266 | 177 | if (!help) |
77ab9cff MJ |
178 | return; |
179 | ||
b67bfe0d | 180 | hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) { |
b560580a PM |
181 | if (del_timer(&exp->timeout)) { |
182 | nf_ct_unlink_expect(exp); | |
183 | nf_ct_expect_put(exp); | |
601e68e1 | 184 | } |
77ab9cff MJ |
185 | } |
186 | } | |
13b18339 | 187 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
77ab9cff MJ |
188 | |
189 | /* Would two expected things clash? */ | |
190 | static inline int expect_clash(const struct nf_conntrack_expect *a, | |
191 | const struct nf_conntrack_expect *b) | |
192 | { | |
193 | /* Part covered by intersection of masks must be unequal, | |
194 | otherwise they clash */ | |
d4156e8c | 195 | struct nf_conntrack_tuple_mask intersect_mask; |
77ab9cff MJ |
196 | int count; |
197 | ||
77ab9cff | 198 | intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all; |
77ab9cff MJ |
199 | |
200 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ | |
201 | intersect_mask.src.u3.all[count] = | |
202 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; | |
203 | } | |
204 | ||
77ab9cff MJ |
205 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask); |
206 | } | |
207 | ||
208 | static inline int expect_matches(const struct nf_conntrack_expect *a, | |
209 | const struct nf_conntrack_expect *b) | |
210 | { | |
f64f9e71 JP |
211 | return a->master == b->master && a->class == b->class && |
212 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && | |
5d0aa2cc PM |
213 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
214 | nf_ct_zone(a->master) == nf_ct_zone(b->master); | |
77ab9cff MJ |
215 | } |
216 | ||
217 | /* Generally a bad idea to call this: could have matched already. */ | |
6823645d | 218 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
77ab9cff | 219 | { |
f8ba1aff | 220 | spin_lock_bh(&nf_conntrack_lock); |
4e1d4e6c PM |
221 | if (del_timer(&exp->timeout)) { |
222 | nf_ct_unlink_expect(exp); | |
223 | nf_ct_expect_put(exp); | |
77ab9cff | 224 | } |
f8ba1aff | 225 | spin_unlock_bh(&nf_conntrack_lock); |
77ab9cff | 226 | } |
6823645d | 227 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
77ab9cff MJ |
228 | |
229 | /* We don't increase the master conntrack refcount for non-fulfilled | |
230 | * conntracks. During the conntrack destruction, the expectations are | |
231 | * always killed before the conntrack itself */ | |
6823645d | 232 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
77ab9cff MJ |
233 | { |
234 | struct nf_conntrack_expect *new; | |
235 | ||
6823645d | 236 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
77ab9cff MJ |
237 | if (!new) |
238 | return NULL; | |
239 | ||
240 | new->master = me; | |
241 | atomic_set(&new->use, 1); | |
242 | return new; | |
243 | } | |
6823645d | 244 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
77ab9cff | 245 | |
6002f266 | 246 | void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, |
76108cea | 247 | u_int8_t family, |
1d9d7522 PM |
248 | const union nf_inet_addr *saddr, |
249 | const union nf_inet_addr *daddr, | |
250 | u_int8_t proto, const __be16 *src, const __be16 *dst) | |
d6a9b650 PM |
251 | { |
252 | int len; | |
253 | ||
254 | if (family == AF_INET) | |
255 | len = 4; | |
256 | else | |
257 | len = 16; | |
258 | ||
259 | exp->flags = 0; | |
6002f266 | 260 | exp->class = class; |
d6a9b650 PM |
261 | exp->expectfn = NULL; |
262 | exp->helper = NULL; | |
263 | exp->tuple.src.l3num = family; | |
264 | exp->tuple.dst.protonum = proto; | |
d6a9b650 PM |
265 | |
266 | if (saddr) { | |
267 | memcpy(&exp->tuple.src.u3, saddr, len); | |
268 | if (sizeof(exp->tuple.src.u3) > len) | |
269 | /* address needs to be cleared for nf_ct_tuple_equal */ | |
270 | memset((void *)&exp->tuple.src.u3 + len, 0x00, | |
271 | sizeof(exp->tuple.src.u3) - len); | |
272 | memset(&exp->mask.src.u3, 0xFF, len); | |
273 | if (sizeof(exp->mask.src.u3) > len) | |
274 | memset((void *)&exp->mask.src.u3 + len, 0x00, | |
275 | sizeof(exp->mask.src.u3) - len); | |
276 | } else { | |
277 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); | |
278 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); | |
279 | } | |
280 | ||
d6a9b650 | 281 | if (src) { |
a34c4589 AV |
282 | exp->tuple.src.u.all = *src; |
283 | exp->mask.src.u.all = htons(0xFFFF); | |
d6a9b650 PM |
284 | } else { |
285 | exp->tuple.src.u.all = 0; | |
286 | exp->mask.src.u.all = 0; | |
287 | } | |
288 | ||
d4156e8c PM |
289 | memcpy(&exp->tuple.dst.u3, daddr, len); |
290 | if (sizeof(exp->tuple.dst.u3) > len) | |
291 | /* address needs to be cleared for nf_ct_tuple_equal */ | |
292 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, | |
293 | sizeof(exp->tuple.dst.u3) - len); | |
294 | ||
a34c4589 | 295 | exp->tuple.dst.u.all = *dst; |
d6a9b650 | 296 | } |
6823645d | 297 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
d6a9b650 | 298 | |
7d0742da PM |
299 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
300 | { | |
301 | struct nf_conntrack_expect *exp; | |
302 | ||
303 | exp = container_of(head, struct nf_conntrack_expect, rcu); | |
304 | kmem_cache_free(nf_ct_expect_cachep, exp); | |
305 | } | |
306 | ||
6823645d | 307 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
77ab9cff MJ |
308 | { |
309 | if (atomic_dec_and_test(&exp->use)) | |
7d0742da | 310 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
77ab9cff | 311 | } |
6823645d | 312 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
77ab9cff | 313 | |
3d058d7b | 314 | static int nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
77ab9cff MJ |
315 | { |
316 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
3d058d7b | 317 | struct nf_conntrack_helper *helper; |
9b03f38d | 318 | struct net *net = nf_ct_exp_net(exp); |
a71c0855 | 319 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
77ab9cff | 320 | |
3bfd45f9 ED |
321 | /* two references : one for hash insert, one for the timer */ |
322 | atomic_add(2, &exp->use); | |
b560580a | 323 | |
3d058d7b PNA |
324 | hlist_add_head(&exp->lnode, &master_help->expectations); |
325 | master_help->expecting[exp->class]++; | |
a71c0855 | 326 | |
9b03f38d AD |
327 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
328 | net->ct.expect_count++; | |
77ab9cff | 329 | |
6823645d PM |
330 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
331 | (unsigned long)exp); | |
3d058d7b PNA |
332 | helper = rcu_dereference_protected(master_help->helper, |
333 | lockdep_is_held(&nf_conntrack_lock)); | |
334 | if (helper) { | |
335 | exp->timeout.expires = jiffies + | |
336 | helper->expect_policy[exp->class].timeout * HZ; | |
bc01befd | 337 | } |
77ab9cff MJ |
338 | add_timer(&exp->timeout); |
339 | ||
0d55af87 | 340 | NF_CT_STAT_INC(net, expect_create); |
3d058d7b | 341 | return 0; |
77ab9cff MJ |
342 | } |
343 | ||
344 | /* Race with expectations being used means we could have none to find; OK. */ | |
6002f266 PM |
345 | static void evict_oldest_expect(struct nf_conn *master, |
346 | struct nf_conntrack_expect *new) | |
77ab9cff | 347 | { |
b560580a | 348 | struct nf_conn_help *master_help = nfct_help(master); |
6002f266 | 349 | struct nf_conntrack_expect *exp, *last = NULL; |
77ab9cff | 350 | |
b67bfe0d | 351 | hlist_for_each_entry(exp, &master_help->expectations, lnode) { |
6002f266 PM |
352 | if (exp->class == new->class) |
353 | last = exp; | |
354 | } | |
b560580a | 355 | |
6002f266 PM |
356 | if (last && del_timer(&last->timeout)) { |
357 | nf_ct_unlink_expect(last); | |
358 | nf_ct_expect_put(last); | |
77ab9cff MJ |
359 | } |
360 | } | |
361 | ||
19abb7b0 | 362 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
77ab9cff | 363 | { |
6002f266 | 364 | const struct nf_conntrack_expect_policy *p; |
77ab9cff MJ |
365 | struct nf_conntrack_expect *i; |
366 | struct nf_conn *master = expect->master; | |
367 | struct nf_conn_help *master_help = nfct_help(master); | |
3d058d7b | 368 | struct nf_conntrack_helper *helper; |
9b03f38d | 369 | struct net *net = nf_ct_exp_net(expect); |
b67bfe0d | 370 | struct hlist_node *next; |
a71c0855 | 371 | unsigned int h; |
83731671 | 372 | int ret = 1; |
77ab9cff | 373 | |
3d058d7b | 374 | if (!master_help) { |
3c158f7f PM |
375 | ret = -ESHUTDOWN; |
376 | goto out; | |
377 | } | |
a71c0855 | 378 | h = nf_ct_expect_dst_hash(&expect->tuple); |
b67bfe0d | 379 | hlist_for_each_entry_safe(i, next, &net->ct.expect_hash[h], hnode) { |
77ab9cff | 380 | if (expect_matches(i, expect)) { |
2614f864 PNA |
381 | if (del_timer(&i->timeout)) { |
382 | nf_ct_unlink_expect(i); | |
383 | nf_ct_expect_put(i); | |
384 | break; | |
77ab9cff MJ |
385 | } |
386 | } else if (expect_clash(i, expect)) { | |
387 | ret = -EBUSY; | |
388 | goto out; | |
389 | } | |
390 | } | |
391 | /* Will be over limit? */ | |
3d058d7b PNA |
392 | helper = rcu_dereference_protected(master_help->helper, |
393 | lockdep_is_held(&nf_conntrack_lock)); | |
394 | if (helper) { | |
395 | p = &helper->expect_policy[expect->class]; | |
bc01befd PNA |
396 | if (p->max_expected && |
397 | master_help->expecting[expect->class] >= p->max_expected) { | |
398 | evict_oldest_expect(master, expect); | |
399 | if (master_help->expecting[expect->class] | |
400 | >= p->max_expected) { | |
401 | ret = -EMFILE; | |
402 | goto out; | |
403 | } | |
6002f266 PM |
404 | } |
405 | } | |
77ab9cff | 406 | |
9b03f38d | 407 | if (net->ct.expect_count >= nf_ct_expect_max) { |
e87cc472 | 408 | net_warn_ratelimited("nf_conntrack: expectation table full\n"); |
f264a7df | 409 | ret = -EMFILE; |
f264a7df | 410 | } |
19abb7b0 PNA |
411 | out: |
412 | return ret; | |
413 | } | |
414 | ||
83731671 | 415 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
ec464e5d | 416 | u32 portid, int report) |
19abb7b0 PNA |
417 | { |
418 | int ret; | |
419 | ||
420 | spin_lock_bh(&nf_conntrack_lock); | |
421 | ret = __nf_ct_expect_check(expect); | |
83731671 | 422 | if (ret <= 0) |
19abb7b0 | 423 | goto out; |
f264a7df | 424 | |
3d058d7b PNA |
425 | ret = nf_ct_expect_insert(expect); |
426 | if (ret < 0) | |
427 | goto out; | |
f8ba1aff | 428 | spin_unlock_bh(&nf_conntrack_lock); |
ec464e5d | 429 | nf_ct_expect_event_report(IPEXP_NEW, expect, portid, report); |
77ab9cff | 430 | return ret; |
19abb7b0 PNA |
431 | out: |
432 | spin_unlock_bh(&nf_conntrack_lock); | |
19abb7b0 PNA |
433 | return ret; |
434 | } | |
435 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); | |
436 | ||
54b07dca | 437 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
5d08ad44 | 438 | struct ct_expect_iter_state { |
dc5129f8 | 439 | struct seq_net_private p; |
5d08ad44 PM |
440 | unsigned int bucket; |
441 | }; | |
442 | ||
443 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) | |
77ab9cff | 444 | { |
dc5129f8 | 445 | struct net *net = seq_file_net(seq); |
5d08ad44 | 446 | struct ct_expect_iter_state *st = seq->private; |
7d0742da | 447 | struct hlist_node *n; |
77ab9cff | 448 | |
5d08ad44 | 449 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
0e60ebe0 | 450 | n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
7d0742da PM |
451 | if (n) |
452 | return n; | |
5d08ad44 PM |
453 | } |
454 | return NULL; | |
455 | } | |
77ab9cff | 456 | |
5d08ad44 PM |
457 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
458 | struct hlist_node *head) | |
459 | { | |
dc5129f8 | 460 | struct net *net = seq_file_net(seq); |
5d08ad44 | 461 | struct ct_expect_iter_state *st = seq->private; |
77ab9cff | 462 | |
0e60ebe0 | 463 | head = rcu_dereference(hlist_next_rcu(head)); |
5d08ad44 PM |
464 | while (head == NULL) { |
465 | if (++st->bucket >= nf_ct_expect_hsize) | |
77ab9cff | 466 | return NULL; |
0e60ebe0 | 467 | head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
77ab9cff | 468 | } |
5d08ad44 | 469 | return head; |
77ab9cff MJ |
470 | } |
471 | ||
5d08ad44 | 472 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
77ab9cff | 473 | { |
5d08ad44 | 474 | struct hlist_node *head = ct_expect_get_first(seq); |
77ab9cff | 475 | |
5d08ad44 PM |
476 | if (head) |
477 | while (pos && (head = ct_expect_get_next(seq, head))) | |
478 | pos--; | |
479 | return pos ? NULL : head; | |
480 | } | |
77ab9cff | 481 | |
5d08ad44 | 482 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
7d0742da | 483 | __acquires(RCU) |
5d08ad44 | 484 | { |
7d0742da | 485 | rcu_read_lock(); |
5d08ad44 PM |
486 | return ct_expect_get_idx(seq, *pos); |
487 | } | |
77ab9cff | 488 | |
5d08ad44 PM |
489 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
490 | { | |
491 | (*pos)++; | |
492 | return ct_expect_get_next(seq, v); | |
77ab9cff MJ |
493 | } |
494 | ||
5d08ad44 | 495 | static void exp_seq_stop(struct seq_file *seq, void *v) |
7d0742da | 496 | __releases(RCU) |
77ab9cff | 497 | { |
7d0742da | 498 | rcu_read_unlock(); |
77ab9cff MJ |
499 | } |
500 | ||
501 | static int exp_seq_show(struct seq_file *s, void *v) | |
502 | { | |
5d08ad44 | 503 | struct nf_conntrack_expect *expect; |
b87921bd | 504 | struct nf_conntrack_helper *helper; |
5d08ad44 | 505 | struct hlist_node *n = v; |
359b9ab6 | 506 | char *delim = ""; |
5d08ad44 PM |
507 | |
508 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); | |
77ab9cff MJ |
509 | |
510 | if (expect->timeout.function) | |
511 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
512 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
513 | else | |
514 | seq_printf(s, "- "); | |
515 | seq_printf(s, "l3proto = %u proto=%u ", | |
516 | expect->tuple.src.l3num, | |
517 | expect->tuple.dst.protonum); | |
518 | print_tuple(s, &expect->tuple, | |
519 | __nf_ct_l3proto_find(expect->tuple.src.l3num), | |
605dcad6 | 520 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
77ab9cff | 521 | expect->tuple.dst.protonum)); |
4bb119ea | 522 | |
359b9ab6 PM |
523 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
524 | seq_printf(s, "PERMANENT"); | |
525 | delim = ","; | |
526 | } | |
bc01befd | 527 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
359b9ab6 | 528 | seq_printf(s, "%sINACTIVE", delim); |
bc01befd PNA |
529 | delim = ","; |
530 | } | |
531 | if (expect->flags & NF_CT_EXPECT_USERSPACE) | |
532 | seq_printf(s, "%sUSERSPACE", delim); | |
4bb119ea | 533 | |
b87921bd PM |
534 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
535 | if (helper) { | |
536 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); | |
537 | if (helper->expect_policy[expect->class].name) | |
538 | seq_printf(s, "/%s", | |
539 | helper->expect_policy[expect->class].name); | |
540 | } | |
541 | ||
77ab9cff MJ |
542 | return seq_putc(s, '\n'); |
543 | } | |
544 | ||
56b3d975 | 545 | static const struct seq_operations exp_seq_ops = { |
77ab9cff MJ |
546 | .start = exp_seq_start, |
547 | .next = exp_seq_next, | |
548 | .stop = exp_seq_stop, | |
549 | .show = exp_seq_show | |
550 | }; | |
551 | ||
552 | static int exp_open(struct inode *inode, struct file *file) | |
553 | { | |
dc5129f8 | 554 | return seq_open_net(inode, file, &exp_seq_ops, |
e2da5913 | 555 | sizeof(struct ct_expect_iter_state)); |
77ab9cff MJ |
556 | } |
557 | ||
5d08ad44 | 558 | static const struct file_operations exp_file_ops = { |
77ab9cff MJ |
559 | .owner = THIS_MODULE, |
560 | .open = exp_open, | |
561 | .read = seq_read, | |
562 | .llseek = seq_lseek, | |
dc5129f8 | 563 | .release = seq_release_net, |
77ab9cff | 564 | }; |
54b07dca | 565 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
e9c1b084 | 566 | |
dc5129f8 | 567 | static int exp_proc_init(struct net *net) |
e9c1b084 | 568 | { |
54b07dca | 569 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
e9c1b084 PM |
570 | struct proc_dir_entry *proc; |
571 | ||
d4beaa66 G |
572 | proc = proc_create("nf_conntrack_expect", 0440, net->proc_net, |
573 | &exp_file_ops); | |
e9c1b084 PM |
574 | if (!proc) |
575 | return -ENOMEM; | |
54b07dca | 576 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
e9c1b084 PM |
577 | return 0; |
578 | } | |
579 | ||
dc5129f8 | 580 | static void exp_proc_remove(struct net *net) |
e9c1b084 | 581 | { |
54b07dca | 582 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
ece31ffd | 583 | remove_proc_entry("nf_conntrack_expect", net->proc_net); |
54b07dca | 584 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
e9c1b084 PM |
585 | } |
586 | ||
13ccdfc2 | 587 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
a71c0855 | 588 | |
83b4dbe1 | 589 | int nf_conntrack_expect_pernet_init(struct net *net) |
e9c1b084 | 590 | { |
a71c0855 PM |
591 | int err = -ENOMEM; |
592 | ||
9b03f38d | 593 | net->ct.expect_count = 0; |
d862a662 | 594 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0); |
9b03f38d | 595 | if (net->ct.expect_hash == NULL) |
a71c0855 | 596 | goto err1; |
e9c1b084 | 597 | |
dc5129f8 | 598 | err = exp_proc_init(net); |
e9c1b084 | 599 | if (err < 0) |
83b4dbe1 | 600 | goto err2; |
e9c1b084 PM |
601 | |
602 | return 0; | |
12293bf9 | 603 | err2: |
d862a662 | 604 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
a71c0855 | 605 | err1: |
e9c1b084 PM |
606 | return err; |
607 | } | |
608 | ||
83b4dbe1 | 609 | void nf_conntrack_expect_pernet_fini(struct net *net) |
e9c1b084 | 610 | { |
dc5129f8 | 611 | exp_proc_remove(net); |
d862a662 | 612 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
e9c1b084 | 613 | } |
83b4dbe1 G |
614 | |
615 | int nf_conntrack_expect_init(void) | |
616 | { | |
617 | if (!nf_ct_expect_hsize) { | |
618 | nf_ct_expect_hsize = nf_conntrack_htable_size / 256; | |
619 | if (!nf_ct_expect_hsize) | |
620 | nf_ct_expect_hsize = 1; | |
621 | } | |
622 | nf_ct_expect_max = nf_ct_expect_hsize * 4; | |
623 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", | |
624 | sizeof(struct nf_conntrack_expect), | |
625 | 0, 0, NULL); | |
626 | if (!nf_ct_expect_cachep) | |
627 | return -ENOMEM; | |
628 | return 0; | |
629 | } | |
630 | ||
631 | void nf_conntrack_expect_fini(void) | |
632 | { | |
633 | rcu_barrier(); /* Wait for call_rcu() before destroy */ | |
634 | kmem_cache_destroy(nf_ct_expect_cachep); | |
635 | } |