Commit | Line | Data |
---|---|---|
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> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/netfilter.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/stddef.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/percpu.h> | |
21 | #include <linux/kernel.h> | |
a71c0855 | 22 | #include <linux/jhash.h> |
457c4cbc | 23 | #include <net/net_namespace.h> |
77ab9cff MJ |
24 | |
25 | #include <net/netfilter/nf_conntrack.h> | |
26 | #include <net/netfilter/nf_conntrack_core.h> | |
27 | #include <net/netfilter/nf_conntrack_expect.h> | |
28 | #include <net/netfilter/nf_conntrack_helper.h> | |
29 | #include <net/netfilter/nf_conntrack_tuple.h> | |
5d0aa2cc | 30 | #include <net/netfilter/nf_conntrack_zones.h> |
77ab9cff | 31 | |
a71c0855 PM |
32 | unsigned int nf_ct_expect_hsize __read_mostly; |
33 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); | |
34 | ||
35 | static unsigned int nf_ct_expect_hash_rnd __read_mostly; | |
f264a7df | 36 | unsigned int nf_ct_expect_max __read_mostly; |
a71c0855 | 37 | static int nf_ct_expect_hash_rnd_initted __read_mostly; |
a71c0855 | 38 | |
e9c1b084 | 39 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
77ab9cff MJ |
40 | |
41 | /* nf_conntrack_expect helper functions */ | |
42 | void nf_ct_unlink_expect(struct nf_conntrack_expect *exp) | |
43 | { | |
44 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
9b03f38d | 45 | struct net *net = nf_ct_exp_net(exp); |
77ab9cff MJ |
46 | |
47 | NF_CT_ASSERT(master_help); | |
48 | NF_CT_ASSERT(!timer_pending(&exp->timeout)); | |
49 | ||
7d0742da | 50 | hlist_del_rcu(&exp->hnode); |
9b03f38d | 51 | net->ct.expect_count--; |
a71c0855 | 52 | |
b560580a | 53 | hlist_del(&exp->lnode); |
6002f266 | 54 | master_help->expecting[exp->class]--; |
6823645d | 55 | nf_ct_expect_put(exp); |
b560580a | 56 | |
0d55af87 | 57 | NF_CT_STAT_INC(net, expect_delete); |
77ab9cff | 58 | } |
13b18339 | 59 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect); |
77ab9cff | 60 | |
6823645d | 61 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
77ab9cff MJ |
62 | { |
63 | struct nf_conntrack_expect *exp = (void *)ul_expect; | |
64 | ||
f8ba1aff | 65 | spin_lock_bh(&nf_conntrack_lock); |
77ab9cff | 66 | nf_ct_unlink_expect(exp); |
f8ba1aff | 67 | spin_unlock_bh(&nf_conntrack_lock); |
6823645d | 68 | nf_ct_expect_put(exp); |
77ab9cff MJ |
69 | } |
70 | ||
a71c0855 PM |
71 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
72 | { | |
34498825 PM |
73 | unsigned int hash; |
74 | ||
a71c0855 | 75 | if (unlikely(!nf_ct_expect_hash_rnd_initted)) { |
af07d241 HPP |
76 | get_random_bytes(&nf_ct_expect_hash_rnd, |
77 | sizeof(nf_ct_expect_hash_rnd)); | |
a71c0855 PM |
78 | nf_ct_expect_hash_rnd_initted = 1; |
79 | } | |
80 | ||
34498825 | 81 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
a71c0855 | 82 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
34498825 PM |
83 | (__force __u16)tuple->dst.u.all) ^ nf_ct_expect_hash_rnd); |
84 | return ((u64)hash * nf_ct_expect_hsize) >> 32; | |
a71c0855 PM |
85 | } |
86 | ||
77ab9cff | 87 | struct nf_conntrack_expect * |
5d0aa2cc PM |
88 | __nf_ct_expect_find(struct net *net, u16 zone, |
89 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
90 | { |
91 | struct nf_conntrack_expect *i; | |
a71c0855 PM |
92 | struct hlist_node *n; |
93 | unsigned int h; | |
94 | ||
9b03f38d | 95 | if (!net->ct.expect_count) |
a71c0855 | 96 | return NULL; |
77ab9cff | 97 | |
a71c0855 | 98 | h = nf_ct_expect_dst_hash(tuple); |
9b03f38d | 99 | hlist_for_each_entry_rcu(i, n, &net->ct.expect_hash[h], hnode) { |
5d0aa2cc PM |
100 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
101 | nf_ct_zone(i->master) == zone) | |
77ab9cff MJ |
102 | return i; |
103 | } | |
104 | return NULL; | |
105 | } | |
6823645d | 106 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
77ab9cff MJ |
107 | |
108 | /* Just find a expectation corresponding to a tuple. */ | |
109 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
110 | nf_ct_expect_find_get(struct net *net, u16 zone, |
111 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
112 | { |
113 | struct nf_conntrack_expect *i; | |
114 | ||
7d0742da | 115 | rcu_read_lock(); |
5d0aa2cc | 116 | i = __nf_ct_expect_find(net, zone, tuple); |
7d0742da PM |
117 | if (i && !atomic_inc_not_zero(&i->use)) |
118 | i = NULL; | |
119 | rcu_read_unlock(); | |
77ab9cff MJ |
120 | |
121 | return i; | |
122 | } | |
6823645d | 123 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
77ab9cff MJ |
124 | |
125 | /* If an expectation for this connection is found, it gets delete from | |
126 | * global list then returned. */ | |
127 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
128 | nf_ct_find_expectation(struct net *net, u16 zone, |
129 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff | 130 | { |
359b9ab6 PM |
131 | struct nf_conntrack_expect *i, *exp = NULL; |
132 | struct hlist_node *n; | |
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); |
9b03f38d | 139 | hlist_for_each_entry(i, n, &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 PM |
173 | struct nf_conntrack_expect *exp; |
174 | struct hlist_node *n, *next; | |
77ab9cff MJ |
175 | |
176 | /* Optimization: most connection never expect any others. */ | |
6002f266 | 177 | if (!help) |
77ab9cff MJ |
178 | return; |
179 | ||
b560580a PM |
180 | hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { |
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 | |
6823645d | 314 | static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
77ab9cff MJ |
315 | { |
316 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
9b03f38d | 317 | struct net *net = nf_ct_exp_net(exp); |
6002f266 | 318 | const struct nf_conntrack_expect_policy *p; |
a71c0855 | 319 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
77ab9cff MJ |
320 | |
321 | atomic_inc(&exp->use); | |
b560580a PM |
322 | |
323 | hlist_add_head(&exp->lnode, &master_help->expectations); | |
6002f266 | 324 | master_help->expecting[exp->class]++; |
a71c0855 | 325 | |
9b03f38d AD |
326 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
327 | net->ct.expect_count++; | |
77ab9cff | 328 | |
6823645d PM |
329 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
330 | (unsigned long)exp); | |
6002f266 PM |
331 | p = &master_help->helper->expect_policy[exp->class]; |
332 | exp->timeout.expires = jiffies + p->timeout * HZ; | |
77ab9cff MJ |
333 | add_timer(&exp->timeout); |
334 | ||
77ab9cff | 335 | atomic_inc(&exp->use); |
0d55af87 | 336 | NF_CT_STAT_INC(net, expect_create); |
77ab9cff MJ |
337 | } |
338 | ||
339 | /* Race with expectations being used means we could have none to find; OK. */ | |
6002f266 PM |
340 | static void evict_oldest_expect(struct nf_conn *master, |
341 | struct nf_conntrack_expect *new) | |
77ab9cff | 342 | { |
b560580a | 343 | struct nf_conn_help *master_help = nfct_help(master); |
6002f266 | 344 | struct nf_conntrack_expect *exp, *last = NULL; |
b560580a | 345 | struct hlist_node *n; |
77ab9cff | 346 | |
6002f266 PM |
347 | hlist_for_each_entry(exp, n, &master_help->expectations, lnode) { |
348 | if (exp->class == new->class) | |
349 | last = exp; | |
350 | } | |
b560580a | 351 | |
6002f266 PM |
352 | if (last && del_timer(&last->timeout)) { |
353 | nf_ct_unlink_expect(last); | |
354 | nf_ct_expect_put(last); | |
77ab9cff MJ |
355 | } |
356 | } | |
357 | ||
358 | static inline int refresh_timer(struct nf_conntrack_expect *i) | |
359 | { | |
360 | struct nf_conn_help *master_help = nfct_help(i->master); | |
6002f266 | 361 | const struct nf_conntrack_expect_policy *p; |
77ab9cff MJ |
362 | |
363 | if (!del_timer(&i->timeout)) | |
364 | return 0; | |
365 | ||
6002f266 PM |
366 | p = &master_help->helper->expect_policy[i->class]; |
367 | i->timeout.expires = jiffies + p->timeout * HZ; | |
77ab9cff MJ |
368 | add_timer(&i->timeout); |
369 | return 1; | |
370 | } | |
371 | ||
19abb7b0 | 372 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
77ab9cff | 373 | { |
6002f266 | 374 | const struct nf_conntrack_expect_policy *p; |
77ab9cff MJ |
375 | struct nf_conntrack_expect *i; |
376 | struct nf_conn *master = expect->master; | |
377 | struct nf_conn_help *master_help = nfct_help(master); | |
9b03f38d | 378 | struct net *net = nf_ct_exp_net(expect); |
a71c0855 PM |
379 | struct hlist_node *n; |
380 | unsigned int h; | |
83731671 | 381 | int ret = 1; |
77ab9cff | 382 | |
3c158f7f PM |
383 | if (!master_help->helper) { |
384 | ret = -ESHUTDOWN; | |
385 | goto out; | |
386 | } | |
a71c0855 | 387 | h = nf_ct_expect_dst_hash(&expect->tuple); |
9b03f38d | 388 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
77ab9cff MJ |
389 | if (expect_matches(i, expect)) { |
390 | /* Refresh timer: if it's dying, ignore.. */ | |
391 | if (refresh_timer(i)) { | |
392 | ret = 0; | |
393 | goto out; | |
394 | } | |
395 | } else if (expect_clash(i, expect)) { | |
396 | ret = -EBUSY; | |
397 | goto out; | |
398 | } | |
399 | } | |
400 | /* Will be over limit? */ | |
6002f266 PM |
401 | p = &master_help->helper->expect_policy[expect->class]; |
402 | if (p->max_expected && | |
403 | master_help->expecting[expect->class] >= p->max_expected) { | |
404 | evict_oldest_expect(master, expect); | |
405 | if (master_help->expecting[expect->class] >= p->max_expected) { | |
406 | ret = -EMFILE; | |
407 | goto out; | |
408 | } | |
409 | } | |
77ab9cff | 410 | |
9b03f38d | 411 | if (net->ct.expect_count >= nf_ct_expect_max) { |
f264a7df PM |
412 | if (net_ratelimit()) |
413 | printk(KERN_WARNING | |
3d89e9cf | 414 | "nf_conntrack: expectation table full\n"); |
f264a7df | 415 | ret = -EMFILE; |
f264a7df | 416 | } |
19abb7b0 PNA |
417 | out: |
418 | return ret; | |
419 | } | |
420 | ||
83731671 PNA |
421 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
422 | u32 pid, int report) | |
19abb7b0 PNA |
423 | { |
424 | int ret; | |
425 | ||
426 | spin_lock_bh(&nf_conntrack_lock); | |
427 | ret = __nf_ct_expect_check(expect); | |
83731671 | 428 | if (ret <= 0) |
19abb7b0 | 429 | goto out; |
f264a7df | 430 | |
83731671 | 431 | ret = 0; |
6823645d | 432 | nf_ct_expect_insert(expect); |
f8ba1aff | 433 | spin_unlock_bh(&nf_conntrack_lock); |
83731671 | 434 | nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report); |
77ab9cff | 435 | return ret; |
19abb7b0 PNA |
436 | out: |
437 | spin_unlock_bh(&nf_conntrack_lock); | |
19abb7b0 PNA |
438 | return ret; |
439 | } | |
440 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); | |
441 | ||
77ab9cff | 442 | #ifdef CONFIG_PROC_FS |
5d08ad44 | 443 | struct ct_expect_iter_state { |
dc5129f8 | 444 | struct seq_net_private p; |
5d08ad44 PM |
445 | unsigned int bucket; |
446 | }; | |
447 | ||
448 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) | |
77ab9cff | 449 | { |
dc5129f8 | 450 | struct net *net = seq_file_net(seq); |
5d08ad44 | 451 | struct ct_expect_iter_state *st = seq->private; |
7d0742da | 452 | struct hlist_node *n; |
77ab9cff | 453 | |
5d08ad44 | 454 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
9b03f38d | 455 | n = rcu_dereference(net->ct.expect_hash[st->bucket].first); |
7d0742da PM |
456 | if (n) |
457 | return n; | |
5d08ad44 PM |
458 | } |
459 | return NULL; | |
460 | } | |
77ab9cff | 461 | |
5d08ad44 PM |
462 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
463 | struct hlist_node *head) | |
464 | { | |
dc5129f8 | 465 | struct net *net = seq_file_net(seq); |
5d08ad44 | 466 | struct ct_expect_iter_state *st = seq->private; |
77ab9cff | 467 | |
7d0742da | 468 | head = rcu_dereference(head->next); |
5d08ad44 PM |
469 | while (head == NULL) { |
470 | if (++st->bucket >= nf_ct_expect_hsize) | |
77ab9cff | 471 | return NULL; |
9b03f38d | 472 | head = rcu_dereference(net->ct.expect_hash[st->bucket].first); |
77ab9cff | 473 | } |
5d08ad44 | 474 | return head; |
77ab9cff MJ |
475 | } |
476 | ||
5d08ad44 | 477 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
77ab9cff | 478 | { |
5d08ad44 | 479 | struct hlist_node *head = ct_expect_get_first(seq); |
77ab9cff | 480 | |
5d08ad44 PM |
481 | if (head) |
482 | while (pos && (head = ct_expect_get_next(seq, head))) | |
483 | pos--; | |
484 | return pos ? NULL : head; | |
485 | } | |
77ab9cff | 486 | |
5d08ad44 | 487 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
7d0742da | 488 | __acquires(RCU) |
5d08ad44 | 489 | { |
7d0742da | 490 | rcu_read_lock(); |
5d08ad44 PM |
491 | return ct_expect_get_idx(seq, *pos); |
492 | } | |
77ab9cff | 493 | |
5d08ad44 PM |
494 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
495 | { | |
496 | (*pos)++; | |
497 | return ct_expect_get_next(seq, v); | |
77ab9cff MJ |
498 | } |
499 | ||
5d08ad44 | 500 | static void exp_seq_stop(struct seq_file *seq, void *v) |
7d0742da | 501 | __releases(RCU) |
77ab9cff | 502 | { |
7d0742da | 503 | rcu_read_unlock(); |
77ab9cff MJ |
504 | } |
505 | ||
506 | static int exp_seq_show(struct seq_file *s, void *v) | |
507 | { | |
5d08ad44 | 508 | struct nf_conntrack_expect *expect; |
b87921bd | 509 | struct nf_conntrack_helper *helper; |
5d08ad44 | 510 | struct hlist_node *n = v; |
359b9ab6 | 511 | char *delim = ""; |
5d08ad44 PM |
512 | |
513 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); | |
77ab9cff MJ |
514 | |
515 | if (expect->timeout.function) | |
516 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
517 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
518 | else | |
519 | seq_printf(s, "- "); | |
520 | seq_printf(s, "l3proto = %u proto=%u ", | |
521 | expect->tuple.src.l3num, | |
522 | expect->tuple.dst.protonum); | |
523 | print_tuple(s, &expect->tuple, | |
524 | __nf_ct_l3proto_find(expect->tuple.src.l3num), | |
605dcad6 | 525 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
77ab9cff | 526 | expect->tuple.dst.protonum)); |
4bb119ea | 527 | |
359b9ab6 PM |
528 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
529 | seq_printf(s, "PERMANENT"); | |
530 | delim = ","; | |
531 | } | |
532 | if (expect->flags & NF_CT_EXPECT_INACTIVE) | |
533 | seq_printf(s, "%sINACTIVE", delim); | |
4bb119ea | 534 | |
b87921bd PM |
535 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
536 | if (helper) { | |
537 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); | |
538 | if (helper->expect_policy[expect->class].name) | |
539 | seq_printf(s, "/%s", | |
540 | helper->expect_policy[expect->class].name); | |
541 | } | |
542 | ||
77ab9cff MJ |
543 | return seq_putc(s, '\n'); |
544 | } | |
545 | ||
56b3d975 | 546 | static const struct seq_operations exp_seq_ops = { |
77ab9cff MJ |
547 | .start = exp_seq_start, |
548 | .next = exp_seq_next, | |
549 | .stop = exp_seq_stop, | |
550 | .show = exp_seq_show | |
551 | }; | |
552 | ||
553 | static int exp_open(struct inode *inode, struct file *file) | |
554 | { | |
dc5129f8 | 555 | return seq_open_net(inode, file, &exp_seq_ops, |
e2da5913 | 556 | sizeof(struct ct_expect_iter_state)); |
77ab9cff MJ |
557 | } |
558 | ||
5d08ad44 | 559 | static const struct file_operations exp_file_ops = { |
77ab9cff MJ |
560 | .owner = THIS_MODULE, |
561 | .open = exp_open, | |
562 | .read = seq_read, | |
563 | .llseek = seq_lseek, | |
dc5129f8 | 564 | .release = seq_release_net, |
77ab9cff MJ |
565 | }; |
566 | #endif /* CONFIG_PROC_FS */ | |
e9c1b084 | 567 | |
dc5129f8 | 568 | static int exp_proc_init(struct net *net) |
e9c1b084 PM |
569 | { |
570 | #ifdef CONFIG_PROC_FS | |
571 | struct proc_dir_entry *proc; | |
572 | ||
dc5129f8 | 573 | proc = proc_net_fops_create(net, "nf_conntrack_expect", 0440, &exp_file_ops); |
e9c1b084 PM |
574 | if (!proc) |
575 | return -ENOMEM; | |
576 | #endif /* CONFIG_PROC_FS */ | |
577 | return 0; | |
578 | } | |
579 | ||
dc5129f8 | 580 | static void exp_proc_remove(struct net *net) |
e9c1b084 PM |
581 | { |
582 | #ifdef CONFIG_PROC_FS | |
dc5129f8 | 583 | proc_net_remove(net, "nf_conntrack_expect"); |
e9c1b084 PM |
584 | #endif /* CONFIG_PROC_FS */ |
585 | } | |
586 | ||
13ccdfc2 | 587 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
a71c0855 | 588 | |
9b03f38d | 589 | int nf_conntrack_expect_init(struct net *net) |
e9c1b084 | 590 | { |
a71c0855 PM |
591 | int err = -ENOMEM; |
592 | ||
08f6547d AD |
593 | if (net_eq(net, &init_net)) { |
594 | if (!nf_ct_expect_hsize) { | |
d696c7bd | 595 | nf_ct_expect_hsize = net->ct.htable_size / 256; |
08f6547d AD |
596 | if (!nf_ct_expect_hsize) |
597 | nf_ct_expect_hsize = 1; | |
598 | } | |
599 | nf_ct_expect_max = nf_ct_expect_hsize * 4; | |
a71c0855 PM |
600 | } |
601 | ||
9b03f38d AD |
602 | net->ct.expect_count = 0; |
603 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, | |
ea781f19 | 604 | &net->ct.expect_vmalloc, 0); |
9b03f38d | 605 | if (net->ct.expect_hash == NULL) |
a71c0855 | 606 | goto err1; |
e9c1b084 | 607 | |
08f6547d AD |
608 | if (net_eq(net, &init_net)) { |
609 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", | |
e9c1b084 | 610 | sizeof(struct nf_conntrack_expect), |
20c2df83 | 611 | 0, 0, NULL); |
08f6547d AD |
612 | if (!nf_ct_expect_cachep) |
613 | goto err2; | |
614 | } | |
e9c1b084 | 615 | |
dc5129f8 | 616 | err = exp_proc_init(net); |
e9c1b084 | 617 | if (err < 0) |
a71c0855 | 618 | goto err3; |
e9c1b084 PM |
619 | |
620 | return 0; | |
621 | ||
a71c0855 | 622 | err3: |
08f6547d AD |
623 | if (net_eq(net, &init_net)) |
624 | kmem_cache_destroy(nf_ct_expect_cachep); | |
12293bf9 | 625 | err2: |
9b03f38d | 626 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
a71c0855 | 627 | nf_ct_expect_hsize); |
a71c0855 | 628 | err1: |
e9c1b084 PM |
629 | return err; |
630 | } | |
631 | ||
9b03f38d | 632 | void nf_conntrack_expect_fini(struct net *net) |
e9c1b084 | 633 | { |
dc5129f8 | 634 | exp_proc_remove(net); |
308ff823 JDB |
635 | if (net_eq(net, &init_net)) { |
636 | rcu_barrier(); /* Wait for call_rcu() before destroy */ | |
08f6547d | 637 | kmem_cache_destroy(nf_ct_expect_cachep); |
308ff823 | 638 | } |
9b03f38d | 639 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
a71c0855 | 640 | nf_ct_expect_hsize); |
e9c1b084 | 641 | } |