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> |
d9b93842 | 23 | #include <linux/moduleparam.h> |
bc3b2d7f | 24 | #include <linux/export.h> |
457c4cbc | 25 | #include <net/net_namespace.h> |
77ab9cff MJ |
26 | |
27 | #include <net/netfilter/nf_conntrack.h> | |
28 | #include <net/netfilter/nf_conntrack_core.h> | |
29 | #include <net/netfilter/nf_conntrack_expect.h> | |
30 | #include <net/netfilter/nf_conntrack_helper.h> | |
31 | #include <net/netfilter/nf_conntrack_tuple.h> | |
5d0aa2cc | 32 | #include <net/netfilter/nf_conntrack_zones.h> |
77ab9cff | 33 | |
a71c0855 PM |
34 | unsigned int nf_ct_expect_hsize __read_mostly; |
35 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); | |
36 | ||
f264a7df | 37 | unsigned int nf_ct_expect_max __read_mostly; |
a71c0855 | 38 | |
e9c1b084 | 39 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
77ab9cff | 40 | |
bc01befd PNA |
41 | static HLIST_HEAD(nf_ct_userspace_expect_list); |
42 | ||
77ab9cff | 43 | /* nf_conntrack_expect helper functions */ |
ebbf41df PNA |
44 | void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp, |
45 | u32 pid, int report) | |
77ab9cff MJ |
46 | { |
47 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
9b03f38d | 48 | struct net *net = nf_ct_exp_net(exp); |
77ab9cff | 49 | |
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); |
bc01befd PNA |
56 | if (!(exp->flags & NF_CT_EXPECT_USERSPACE)) |
57 | master_help->expecting[exp->class]--; | |
58 | ||
ebbf41df | 59 | nf_ct_expect_event_report(IPEXP_DESTROY, exp, pid, report); |
6823645d | 60 | nf_ct_expect_put(exp); |
b560580a | 61 | |
0d55af87 | 62 | NF_CT_STAT_INC(net, expect_delete); |
77ab9cff | 63 | } |
ebbf41df | 64 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report); |
77ab9cff | 65 | |
6823645d | 66 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
77ab9cff MJ |
67 | { |
68 | struct nf_conntrack_expect *exp = (void *)ul_expect; | |
69 | ||
f8ba1aff | 70 | spin_lock_bh(&nf_conntrack_lock); |
77ab9cff | 71 | nf_ct_unlink_expect(exp); |
f8ba1aff | 72 | spin_unlock_bh(&nf_conntrack_lock); |
6823645d | 73 | nf_ct_expect_put(exp); |
77ab9cff MJ |
74 | } |
75 | ||
a71c0855 PM |
76 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
77 | { | |
34498825 PM |
78 | unsigned int hash; |
79 | ||
f682cefa CG |
80 | if (unlikely(!nf_conntrack_hash_rnd)) { |
81 | init_nf_conntrack_hash_rnd(); | |
a71c0855 PM |
82 | } |
83 | ||
34498825 | 84 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
a71c0855 | 85 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
f682cefa | 86 | (__force __u16)tuple->dst.u.all) ^ nf_conntrack_hash_rnd); |
34498825 | 87 | return ((u64)hash * nf_ct_expect_hsize) >> 32; |
a71c0855 PM |
88 | } |
89 | ||
77ab9cff | 90 | struct nf_conntrack_expect * |
5d0aa2cc PM |
91 | __nf_ct_expect_find(struct net *net, u16 zone, |
92 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
93 | { |
94 | struct nf_conntrack_expect *i; | |
a71c0855 PM |
95 | struct hlist_node *n; |
96 | unsigned int h; | |
97 | ||
9b03f38d | 98 | if (!net->ct.expect_count) |
a71c0855 | 99 | return NULL; |
77ab9cff | 100 | |
a71c0855 | 101 | h = nf_ct_expect_dst_hash(tuple); |
9b03f38d | 102 | hlist_for_each_entry_rcu(i, n, &net->ct.expect_hash[h], hnode) { |
5d0aa2cc PM |
103 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
104 | nf_ct_zone(i->master) == zone) | |
77ab9cff MJ |
105 | return i; |
106 | } | |
107 | return NULL; | |
108 | } | |
6823645d | 109 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
77ab9cff MJ |
110 | |
111 | /* Just find a expectation corresponding to a tuple. */ | |
112 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
113 | nf_ct_expect_find_get(struct net *net, u16 zone, |
114 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff MJ |
115 | { |
116 | struct nf_conntrack_expect *i; | |
117 | ||
7d0742da | 118 | rcu_read_lock(); |
5d0aa2cc | 119 | i = __nf_ct_expect_find(net, zone, tuple); |
7d0742da PM |
120 | if (i && !atomic_inc_not_zero(&i->use)) |
121 | i = NULL; | |
122 | rcu_read_unlock(); | |
77ab9cff MJ |
123 | |
124 | return i; | |
125 | } | |
6823645d | 126 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
77ab9cff MJ |
127 | |
128 | /* If an expectation for this connection is found, it gets delete from | |
129 | * global list then returned. */ | |
130 | struct nf_conntrack_expect * | |
5d0aa2cc PM |
131 | nf_ct_find_expectation(struct net *net, u16 zone, |
132 | const struct nf_conntrack_tuple *tuple) | |
77ab9cff | 133 | { |
359b9ab6 PM |
134 | struct nf_conntrack_expect *i, *exp = NULL; |
135 | struct hlist_node *n; | |
136 | unsigned int h; | |
137 | ||
9b03f38d | 138 | if (!net->ct.expect_count) |
359b9ab6 | 139 | return NULL; |
ece00641 | 140 | |
359b9ab6 | 141 | h = nf_ct_expect_dst_hash(tuple); |
9b03f38d | 142 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
359b9ab6 | 143 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
5d0aa2cc PM |
144 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
145 | nf_ct_zone(i->master) == zone) { | |
359b9ab6 PM |
146 | exp = i; |
147 | break; | |
148 | } | |
149 | } | |
ece00641 YK |
150 | if (!exp) |
151 | return NULL; | |
77ab9cff | 152 | |
77ab9cff MJ |
153 | /* If master is not in hash table yet (ie. packet hasn't left |
154 | this machine yet), how can other end know about expected? | |
155 | Hence these are not the droids you are looking for (if | |
156 | master ct never got confirmed, we'd hold a reference to it | |
157 | and weird things would happen to future packets). */ | |
ece00641 YK |
158 | if (!nf_ct_is_confirmed(exp->master)) |
159 | return NULL; | |
160 | ||
161 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { | |
162 | atomic_inc(&exp->use); | |
163 | return exp; | |
164 | } else if (del_timer(&exp->timeout)) { | |
165 | nf_ct_unlink_expect(exp); | |
166 | return exp; | |
77ab9cff | 167 | } |
ece00641 | 168 | |
77ab9cff MJ |
169 | return NULL; |
170 | } | |
171 | ||
172 | /* delete all expectations for this conntrack */ | |
173 | void nf_ct_remove_expectations(struct nf_conn *ct) | |
174 | { | |
77ab9cff | 175 | struct nf_conn_help *help = nfct_help(ct); |
b560580a PM |
176 | struct nf_conntrack_expect *exp; |
177 | struct hlist_node *n, *next; | |
77ab9cff MJ |
178 | |
179 | /* Optimization: most connection never expect any others. */ | |
6002f266 | 180 | if (!help) |
77ab9cff MJ |
181 | return; |
182 | ||
b560580a PM |
183 | hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { |
184 | if (del_timer(&exp->timeout)) { | |
185 | nf_ct_unlink_expect(exp); | |
186 | nf_ct_expect_put(exp); | |
601e68e1 | 187 | } |
77ab9cff MJ |
188 | } |
189 | } | |
13b18339 | 190 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
77ab9cff MJ |
191 | |
192 | /* Would two expected things clash? */ | |
193 | static inline int expect_clash(const struct nf_conntrack_expect *a, | |
194 | const struct nf_conntrack_expect *b) | |
195 | { | |
196 | /* Part covered by intersection of masks must be unequal, | |
197 | otherwise they clash */ | |
d4156e8c | 198 | struct nf_conntrack_tuple_mask intersect_mask; |
77ab9cff MJ |
199 | int count; |
200 | ||
77ab9cff | 201 | intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all; |
77ab9cff MJ |
202 | |
203 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ | |
204 | intersect_mask.src.u3.all[count] = | |
205 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; | |
206 | } | |
207 | ||
77ab9cff MJ |
208 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask); |
209 | } | |
210 | ||
211 | static inline int expect_matches(const struct nf_conntrack_expect *a, | |
212 | const struct nf_conntrack_expect *b) | |
213 | { | |
f64f9e71 JP |
214 | return a->master == b->master && a->class == b->class && |
215 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && | |
5d0aa2cc PM |
216 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
217 | nf_ct_zone(a->master) == nf_ct_zone(b->master); | |
77ab9cff MJ |
218 | } |
219 | ||
220 | /* Generally a bad idea to call this: could have matched already. */ | |
6823645d | 221 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
77ab9cff | 222 | { |
f8ba1aff | 223 | spin_lock_bh(&nf_conntrack_lock); |
4e1d4e6c PM |
224 | if (del_timer(&exp->timeout)) { |
225 | nf_ct_unlink_expect(exp); | |
226 | nf_ct_expect_put(exp); | |
77ab9cff | 227 | } |
f8ba1aff | 228 | spin_unlock_bh(&nf_conntrack_lock); |
77ab9cff | 229 | } |
6823645d | 230 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
77ab9cff MJ |
231 | |
232 | /* We don't increase the master conntrack refcount for non-fulfilled | |
233 | * conntracks. During the conntrack destruction, the expectations are | |
234 | * always killed before the conntrack itself */ | |
6823645d | 235 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
77ab9cff MJ |
236 | { |
237 | struct nf_conntrack_expect *new; | |
238 | ||
6823645d | 239 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
77ab9cff MJ |
240 | if (!new) |
241 | return NULL; | |
242 | ||
243 | new->master = me; | |
244 | atomic_set(&new->use, 1); | |
245 | return new; | |
246 | } | |
6823645d | 247 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
77ab9cff | 248 | |
6002f266 | 249 | void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, |
76108cea | 250 | u_int8_t family, |
1d9d7522 PM |
251 | const union nf_inet_addr *saddr, |
252 | const union nf_inet_addr *daddr, | |
253 | u_int8_t proto, const __be16 *src, const __be16 *dst) | |
d6a9b650 PM |
254 | { |
255 | int len; | |
256 | ||
257 | if (family == AF_INET) | |
258 | len = 4; | |
259 | else | |
260 | len = 16; | |
261 | ||
262 | exp->flags = 0; | |
6002f266 | 263 | exp->class = class; |
d6a9b650 PM |
264 | exp->expectfn = NULL; |
265 | exp->helper = NULL; | |
266 | exp->tuple.src.l3num = family; | |
267 | exp->tuple.dst.protonum = proto; | |
d6a9b650 PM |
268 | |
269 | if (saddr) { | |
270 | memcpy(&exp->tuple.src.u3, saddr, len); | |
271 | if (sizeof(exp->tuple.src.u3) > len) | |
272 | /* address needs to be cleared for nf_ct_tuple_equal */ | |
273 | memset((void *)&exp->tuple.src.u3 + len, 0x00, | |
274 | sizeof(exp->tuple.src.u3) - len); | |
275 | memset(&exp->mask.src.u3, 0xFF, len); | |
276 | if (sizeof(exp->mask.src.u3) > len) | |
277 | memset((void *)&exp->mask.src.u3 + len, 0x00, | |
278 | sizeof(exp->mask.src.u3) - len); | |
279 | } else { | |
280 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); | |
281 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); | |
282 | } | |
283 | ||
d6a9b650 | 284 | if (src) { |
a34c4589 AV |
285 | exp->tuple.src.u.all = *src; |
286 | exp->mask.src.u.all = htons(0xFFFF); | |
d6a9b650 PM |
287 | } else { |
288 | exp->tuple.src.u.all = 0; | |
289 | exp->mask.src.u.all = 0; | |
290 | } | |
291 | ||
d4156e8c PM |
292 | memcpy(&exp->tuple.dst.u3, daddr, len); |
293 | if (sizeof(exp->tuple.dst.u3) > len) | |
294 | /* address needs to be cleared for nf_ct_tuple_equal */ | |
295 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, | |
296 | sizeof(exp->tuple.dst.u3) - len); | |
297 | ||
a34c4589 | 298 | exp->tuple.dst.u.all = *dst; |
d6a9b650 | 299 | } |
6823645d | 300 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
d6a9b650 | 301 | |
7d0742da PM |
302 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
303 | { | |
304 | struct nf_conntrack_expect *exp; | |
305 | ||
306 | exp = container_of(head, struct nf_conntrack_expect, rcu); | |
307 | kmem_cache_free(nf_ct_expect_cachep, exp); | |
308 | } | |
309 | ||
6823645d | 310 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
77ab9cff MJ |
311 | { |
312 | if (atomic_dec_and_test(&exp->use)) | |
7d0742da | 313 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
77ab9cff | 314 | } |
6823645d | 315 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
77ab9cff | 316 | |
6823645d | 317 | static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
77ab9cff MJ |
318 | { |
319 | struct nf_conn_help *master_help = nfct_help(exp->master); | |
9b03f38d | 320 | struct net *net = nf_ct_exp_net(exp); |
6002f266 | 321 | const struct nf_conntrack_expect_policy *p; |
a71c0855 | 322 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
77ab9cff | 323 | |
3bfd45f9 ED |
324 | /* two references : one for hash insert, one for the timer */ |
325 | atomic_add(2, &exp->use); | |
b560580a | 326 | |
bc01befd PNA |
327 | if (master_help) { |
328 | hlist_add_head(&exp->lnode, &master_help->expectations); | |
329 | master_help->expecting[exp->class]++; | |
330 | } else if (exp->flags & NF_CT_EXPECT_USERSPACE) | |
331 | hlist_add_head(&exp->lnode, &nf_ct_userspace_expect_list); | |
a71c0855 | 332 | |
9b03f38d AD |
333 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
334 | net->ct.expect_count++; | |
77ab9cff | 335 | |
6823645d PM |
336 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
337 | (unsigned long)exp); | |
bc01befd | 338 | if (master_help) { |
c5d277d2 ED |
339 | p = &rcu_dereference_protected( |
340 | master_help->helper, | |
341 | lockdep_is_held(&nf_conntrack_lock) | |
342 | )->expect_policy[exp->class]; | |
bc01befd PNA |
343 | exp->timeout.expires = jiffies + p->timeout * HZ; |
344 | } | |
77ab9cff MJ |
345 | add_timer(&exp->timeout); |
346 | ||
0d55af87 | 347 | NF_CT_STAT_INC(net, expect_create); |
77ab9cff MJ |
348 | } |
349 | ||
350 | /* Race with expectations being used means we could have none to find; OK. */ | |
6002f266 PM |
351 | static void evict_oldest_expect(struct nf_conn *master, |
352 | struct nf_conntrack_expect *new) | |
77ab9cff | 353 | { |
b560580a | 354 | struct nf_conn_help *master_help = nfct_help(master); |
6002f266 | 355 | struct nf_conntrack_expect *exp, *last = NULL; |
b560580a | 356 | struct hlist_node *n; |
77ab9cff | 357 | |
6002f266 PM |
358 | hlist_for_each_entry(exp, n, &master_help->expectations, lnode) { |
359 | if (exp->class == new->class) | |
360 | last = exp; | |
361 | } | |
b560580a | 362 | |
6002f266 PM |
363 | if (last && del_timer(&last->timeout)) { |
364 | nf_ct_unlink_expect(last); | |
365 | nf_ct_expect_put(last); | |
77ab9cff MJ |
366 | } |
367 | } | |
368 | ||
369 | static inline int refresh_timer(struct nf_conntrack_expect *i) | |
370 | { | |
371 | struct nf_conn_help *master_help = nfct_help(i->master); | |
6002f266 | 372 | const struct nf_conntrack_expect_policy *p; |
77ab9cff MJ |
373 | |
374 | if (!del_timer(&i->timeout)) | |
375 | return 0; | |
376 | ||
c5d277d2 ED |
377 | p = &rcu_dereference_protected( |
378 | master_help->helper, | |
379 | lockdep_is_held(&nf_conntrack_lock) | |
380 | )->expect_policy[i->class]; | |
6002f266 | 381 | i->timeout.expires = jiffies + p->timeout * HZ; |
77ab9cff MJ |
382 | add_timer(&i->timeout); |
383 | return 1; | |
384 | } | |
385 | ||
19abb7b0 | 386 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
77ab9cff | 387 | { |
6002f266 | 388 | const struct nf_conntrack_expect_policy *p; |
77ab9cff MJ |
389 | struct nf_conntrack_expect *i; |
390 | struct nf_conn *master = expect->master; | |
391 | struct nf_conn_help *master_help = nfct_help(master); | |
9b03f38d | 392 | struct net *net = nf_ct_exp_net(expect); |
a71c0855 PM |
393 | struct hlist_node *n; |
394 | unsigned int h; | |
83731671 | 395 | int ret = 1; |
77ab9cff | 396 | |
bc01befd PNA |
397 | /* Don't allow expectations created from kernel-space with no helper */ |
398 | if (!(expect->flags & NF_CT_EXPECT_USERSPACE) && | |
399 | (!master_help || (master_help && !master_help->helper))) { | |
3c158f7f PM |
400 | ret = -ESHUTDOWN; |
401 | goto out; | |
402 | } | |
a71c0855 | 403 | h = nf_ct_expect_dst_hash(&expect->tuple); |
9b03f38d | 404 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
77ab9cff MJ |
405 | if (expect_matches(i, expect)) { |
406 | /* Refresh timer: if it's dying, ignore.. */ | |
407 | if (refresh_timer(i)) { | |
408 | ret = 0; | |
409 | goto out; | |
410 | } | |
411 | } else if (expect_clash(i, expect)) { | |
412 | ret = -EBUSY; | |
413 | goto out; | |
414 | } | |
415 | } | |
416 | /* Will be over limit? */ | |
bc01befd | 417 | if (master_help) { |
c5d277d2 ED |
418 | p = &rcu_dereference_protected( |
419 | master_help->helper, | |
420 | lockdep_is_held(&nf_conntrack_lock) | |
421 | )->expect_policy[expect->class]; | |
bc01befd PNA |
422 | if (p->max_expected && |
423 | master_help->expecting[expect->class] >= p->max_expected) { | |
424 | evict_oldest_expect(master, expect); | |
425 | if (master_help->expecting[expect->class] | |
426 | >= p->max_expected) { | |
427 | ret = -EMFILE; | |
428 | goto out; | |
429 | } | |
6002f266 PM |
430 | } |
431 | } | |
77ab9cff | 432 | |
9b03f38d | 433 | if (net->ct.expect_count >= nf_ct_expect_max) { |
f264a7df PM |
434 | if (net_ratelimit()) |
435 | printk(KERN_WARNING | |
3d89e9cf | 436 | "nf_conntrack: expectation table full\n"); |
f264a7df | 437 | ret = -EMFILE; |
f264a7df | 438 | } |
19abb7b0 PNA |
439 | out: |
440 | return ret; | |
441 | } | |
442 | ||
83731671 PNA |
443 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
444 | u32 pid, int report) | |
19abb7b0 PNA |
445 | { |
446 | int ret; | |
447 | ||
448 | spin_lock_bh(&nf_conntrack_lock); | |
449 | ret = __nf_ct_expect_check(expect); | |
83731671 | 450 | if (ret <= 0) |
19abb7b0 | 451 | goto out; |
f264a7df | 452 | |
83731671 | 453 | ret = 0; |
6823645d | 454 | nf_ct_expect_insert(expect); |
f8ba1aff | 455 | spin_unlock_bh(&nf_conntrack_lock); |
83731671 | 456 | nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report); |
77ab9cff | 457 | return ret; |
19abb7b0 PNA |
458 | out: |
459 | spin_unlock_bh(&nf_conntrack_lock); | |
19abb7b0 PNA |
460 | return ret; |
461 | } | |
462 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); | |
463 | ||
bc01befd PNA |
464 | void nf_ct_remove_userspace_expectations(void) |
465 | { | |
466 | struct nf_conntrack_expect *exp; | |
467 | struct hlist_node *n, *next; | |
468 | ||
469 | hlist_for_each_entry_safe(exp, n, next, | |
470 | &nf_ct_userspace_expect_list, lnode) { | |
471 | if (del_timer(&exp->timeout)) { | |
472 | nf_ct_unlink_expect(exp); | |
473 | nf_ct_expect_put(exp); | |
474 | } | |
475 | } | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(nf_ct_remove_userspace_expectations); | |
478 | ||
77ab9cff | 479 | #ifdef CONFIG_PROC_FS |
5d08ad44 | 480 | struct ct_expect_iter_state { |
dc5129f8 | 481 | struct seq_net_private p; |
5d08ad44 PM |
482 | unsigned int bucket; |
483 | }; | |
484 | ||
485 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) | |
77ab9cff | 486 | { |
dc5129f8 | 487 | struct net *net = seq_file_net(seq); |
5d08ad44 | 488 | struct ct_expect_iter_state *st = seq->private; |
7d0742da | 489 | struct hlist_node *n; |
77ab9cff | 490 | |
5d08ad44 | 491 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
0e60ebe0 | 492 | n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
7d0742da PM |
493 | if (n) |
494 | return n; | |
5d08ad44 PM |
495 | } |
496 | return NULL; | |
497 | } | |
77ab9cff | 498 | |
5d08ad44 PM |
499 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
500 | struct hlist_node *head) | |
501 | { | |
dc5129f8 | 502 | struct net *net = seq_file_net(seq); |
5d08ad44 | 503 | struct ct_expect_iter_state *st = seq->private; |
77ab9cff | 504 | |
0e60ebe0 | 505 | head = rcu_dereference(hlist_next_rcu(head)); |
5d08ad44 PM |
506 | while (head == NULL) { |
507 | if (++st->bucket >= nf_ct_expect_hsize) | |
77ab9cff | 508 | return NULL; |
0e60ebe0 | 509 | head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
77ab9cff | 510 | } |
5d08ad44 | 511 | return head; |
77ab9cff MJ |
512 | } |
513 | ||
5d08ad44 | 514 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
77ab9cff | 515 | { |
5d08ad44 | 516 | struct hlist_node *head = ct_expect_get_first(seq); |
77ab9cff | 517 | |
5d08ad44 PM |
518 | if (head) |
519 | while (pos && (head = ct_expect_get_next(seq, head))) | |
520 | pos--; | |
521 | return pos ? NULL : head; | |
522 | } | |
77ab9cff | 523 | |
5d08ad44 | 524 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
7d0742da | 525 | __acquires(RCU) |
5d08ad44 | 526 | { |
7d0742da | 527 | rcu_read_lock(); |
5d08ad44 PM |
528 | return ct_expect_get_idx(seq, *pos); |
529 | } | |
77ab9cff | 530 | |
5d08ad44 PM |
531 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
532 | { | |
533 | (*pos)++; | |
534 | return ct_expect_get_next(seq, v); | |
77ab9cff MJ |
535 | } |
536 | ||
5d08ad44 | 537 | static void exp_seq_stop(struct seq_file *seq, void *v) |
7d0742da | 538 | __releases(RCU) |
77ab9cff | 539 | { |
7d0742da | 540 | rcu_read_unlock(); |
77ab9cff MJ |
541 | } |
542 | ||
543 | static int exp_seq_show(struct seq_file *s, void *v) | |
544 | { | |
5d08ad44 | 545 | struct nf_conntrack_expect *expect; |
b87921bd | 546 | struct nf_conntrack_helper *helper; |
5d08ad44 | 547 | struct hlist_node *n = v; |
359b9ab6 | 548 | char *delim = ""; |
5d08ad44 PM |
549 | |
550 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); | |
77ab9cff MJ |
551 | |
552 | if (expect->timeout.function) | |
553 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
554 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
555 | else | |
556 | seq_printf(s, "- "); | |
557 | seq_printf(s, "l3proto = %u proto=%u ", | |
558 | expect->tuple.src.l3num, | |
559 | expect->tuple.dst.protonum); | |
560 | print_tuple(s, &expect->tuple, | |
561 | __nf_ct_l3proto_find(expect->tuple.src.l3num), | |
605dcad6 | 562 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
77ab9cff | 563 | expect->tuple.dst.protonum)); |
4bb119ea | 564 | |
359b9ab6 PM |
565 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
566 | seq_printf(s, "PERMANENT"); | |
567 | delim = ","; | |
568 | } | |
bc01befd | 569 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
359b9ab6 | 570 | seq_printf(s, "%sINACTIVE", delim); |
bc01befd PNA |
571 | delim = ","; |
572 | } | |
573 | if (expect->flags & NF_CT_EXPECT_USERSPACE) | |
574 | seq_printf(s, "%sUSERSPACE", delim); | |
4bb119ea | 575 | |
b87921bd PM |
576 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
577 | if (helper) { | |
578 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); | |
579 | if (helper->expect_policy[expect->class].name) | |
580 | seq_printf(s, "/%s", | |
581 | helper->expect_policy[expect->class].name); | |
582 | } | |
583 | ||
77ab9cff MJ |
584 | return seq_putc(s, '\n'); |
585 | } | |
586 | ||
56b3d975 | 587 | static const struct seq_operations exp_seq_ops = { |
77ab9cff MJ |
588 | .start = exp_seq_start, |
589 | .next = exp_seq_next, | |
590 | .stop = exp_seq_stop, | |
591 | .show = exp_seq_show | |
592 | }; | |
593 | ||
594 | static int exp_open(struct inode *inode, struct file *file) | |
595 | { | |
dc5129f8 | 596 | return seq_open_net(inode, file, &exp_seq_ops, |
e2da5913 | 597 | sizeof(struct ct_expect_iter_state)); |
77ab9cff MJ |
598 | } |
599 | ||
5d08ad44 | 600 | static const struct file_operations exp_file_ops = { |
77ab9cff MJ |
601 | .owner = THIS_MODULE, |
602 | .open = exp_open, | |
603 | .read = seq_read, | |
604 | .llseek = seq_lseek, | |
dc5129f8 | 605 | .release = seq_release_net, |
77ab9cff MJ |
606 | }; |
607 | #endif /* CONFIG_PROC_FS */ | |
e9c1b084 | 608 | |
dc5129f8 | 609 | static int exp_proc_init(struct net *net) |
e9c1b084 PM |
610 | { |
611 | #ifdef CONFIG_PROC_FS | |
612 | struct proc_dir_entry *proc; | |
613 | ||
dc5129f8 | 614 | proc = proc_net_fops_create(net, "nf_conntrack_expect", 0440, &exp_file_ops); |
e9c1b084 PM |
615 | if (!proc) |
616 | return -ENOMEM; | |
617 | #endif /* CONFIG_PROC_FS */ | |
618 | return 0; | |
619 | } | |
620 | ||
dc5129f8 | 621 | static void exp_proc_remove(struct net *net) |
e9c1b084 PM |
622 | { |
623 | #ifdef CONFIG_PROC_FS | |
dc5129f8 | 624 | proc_net_remove(net, "nf_conntrack_expect"); |
e9c1b084 PM |
625 | #endif /* CONFIG_PROC_FS */ |
626 | } | |
627 | ||
13ccdfc2 | 628 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
a71c0855 | 629 | |
9b03f38d | 630 | int nf_conntrack_expect_init(struct net *net) |
e9c1b084 | 631 | { |
a71c0855 PM |
632 | int err = -ENOMEM; |
633 | ||
08f6547d AD |
634 | if (net_eq(net, &init_net)) { |
635 | if (!nf_ct_expect_hsize) { | |
d696c7bd | 636 | nf_ct_expect_hsize = net->ct.htable_size / 256; |
08f6547d AD |
637 | if (!nf_ct_expect_hsize) |
638 | nf_ct_expect_hsize = 1; | |
639 | } | |
640 | nf_ct_expect_max = nf_ct_expect_hsize * 4; | |
a71c0855 PM |
641 | } |
642 | ||
9b03f38d | 643 | net->ct.expect_count = 0; |
d862a662 | 644 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0); |
9b03f38d | 645 | if (net->ct.expect_hash == NULL) |
a71c0855 | 646 | goto err1; |
e9c1b084 | 647 | |
08f6547d AD |
648 | if (net_eq(net, &init_net)) { |
649 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", | |
e9c1b084 | 650 | sizeof(struct nf_conntrack_expect), |
20c2df83 | 651 | 0, 0, NULL); |
08f6547d AD |
652 | if (!nf_ct_expect_cachep) |
653 | goto err2; | |
654 | } | |
e9c1b084 | 655 | |
dc5129f8 | 656 | err = exp_proc_init(net); |
e9c1b084 | 657 | if (err < 0) |
a71c0855 | 658 | goto err3; |
e9c1b084 PM |
659 | |
660 | return 0; | |
661 | ||
a71c0855 | 662 | err3: |
08f6547d AD |
663 | if (net_eq(net, &init_net)) |
664 | kmem_cache_destroy(nf_ct_expect_cachep); | |
12293bf9 | 665 | err2: |
d862a662 | 666 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
a71c0855 | 667 | err1: |
e9c1b084 PM |
668 | return err; |
669 | } | |
670 | ||
9b03f38d | 671 | void nf_conntrack_expect_fini(struct net *net) |
e9c1b084 | 672 | { |
dc5129f8 | 673 | exp_proc_remove(net); |
308ff823 JDB |
674 | if (net_eq(net, &init_net)) { |
675 | rcu_barrier(); /* Wait for call_rcu() before destroy */ | |
08f6547d | 676 | kmem_cache_destroy(nf_ct_expect_cachep); |
308ff823 | 677 | } |
d862a662 | 678 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
e9c1b084 | 679 | } |