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1 | /* (C) 1999-2001 Paul `Rusty' Russell | |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * (C) 2005-2012 Patrick McHardy <kaber@trash.net> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/netfilter.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/percpu.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/security.h> | |
20 | #include <net/net_namespace.h> | |
21 | #ifdef CONFIG_SYSCTL | |
22 | #include <linux/sysctl.h> | |
23 | #endif | |
24 | ||
25 | #include <net/netfilter/nf_conntrack.h> | |
26 | #include <net/netfilter/nf_conntrack_core.h> | |
27 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
28 | #include <net/netfilter/nf_conntrack_l4proto.h> | |
29 | #include <net/netfilter/nf_conntrack_expect.h> | |
30 | #include <net/netfilter/nf_conntrack_helper.h> | |
31 | #include <net/netfilter/nf_conntrack_acct.h> | |
32 | #include <net/netfilter/nf_conntrack_zones.h> | |
33 | #include <net/netfilter/nf_conntrack_timestamp.h> | |
34 | #include <linux/rculist_nulls.h> | |
35 | ||
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | #ifdef CONFIG_NF_CONNTRACK_PROCFS | |
39 | void | |
40 | print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, | |
41 | const struct nf_conntrack_l3proto *l3proto, | |
42 | const struct nf_conntrack_l4proto *l4proto) | |
43 | { | |
44 | l3proto->print_tuple(s, tuple); | |
45 | l4proto->print_tuple(s, tuple); | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(print_tuple); | |
48 | ||
49 | struct ct_iter_state { | |
50 | struct seq_net_private p; | |
51 | struct hlist_nulls_head *hash; | |
52 | unsigned int htable_size; | |
53 | unsigned int bucket; | |
54 | u_int64_t time_now; | |
55 | }; | |
56 | ||
57 | static struct hlist_nulls_node *ct_get_first(struct seq_file *seq) | |
58 | { | |
59 | struct ct_iter_state *st = seq->private; | |
60 | struct hlist_nulls_node *n; | |
61 | ||
62 | for (st->bucket = 0; | |
63 | st->bucket < st->htable_size; | |
64 | st->bucket++) { | |
65 | n = rcu_dereference( | |
66 | hlist_nulls_first_rcu(&st->hash[st->bucket])); | |
67 | if (!is_a_nulls(n)) | |
68 | return n; | |
69 | } | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | static struct hlist_nulls_node *ct_get_next(struct seq_file *seq, | |
74 | struct hlist_nulls_node *head) | |
75 | { | |
76 | struct ct_iter_state *st = seq->private; | |
77 | ||
78 | head = rcu_dereference(hlist_nulls_next_rcu(head)); | |
79 | while (is_a_nulls(head)) { | |
80 | if (likely(get_nulls_value(head) == st->bucket)) { | |
81 | if (++st->bucket >= st->htable_size) | |
82 | return NULL; | |
83 | } | |
84 | head = rcu_dereference( | |
85 | hlist_nulls_first_rcu(&st->hash[st->bucket])); | |
86 | } | |
87 | return head; | |
88 | } | |
89 | ||
90 | static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos) | |
91 | { | |
92 | struct hlist_nulls_node *head = ct_get_first(seq); | |
93 | ||
94 | if (head) | |
95 | while (pos && (head = ct_get_next(seq, head))) | |
96 | pos--; | |
97 | return pos ? NULL : head; | |
98 | } | |
99 | ||
100 | static void *ct_seq_start(struct seq_file *seq, loff_t *pos) | |
101 | __acquires(RCU) | |
102 | { | |
103 | struct ct_iter_state *st = seq->private; | |
104 | ||
105 | st->time_now = ktime_get_real_ns(); | |
106 | rcu_read_lock(); | |
107 | ||
108 | nf_conntrack_get_ht(&st->hash, &st->htable_size); | |
109 | return ct_get_idx(seq, *pos); | |
110 | } | |
111 | ||
112 | static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
113 | { | |
114 | (*pos)++; | |
115 | return ct_get_next(s, v); | |
116 | } | |
117 | ||
118 | static void ct_seq_stop(struct seq_file *s, void *v) | |
119 | __releases(RCU) | |
120 | { | |
121 | rcu_read_unlock(); | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
125 | static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) | |
126 | { | |
127 | int ret; | |
128 | u32 len; | |
129 | char *secctx; | |
130 | ||
131 | ret = security_secid_to_secctx(ct->secmark, &secctx, &len); | |
132 | if (ret) | |
133 | return; | |
134 | ||
135 | seq_printf(s, "secctx=%s ", secctx); | |
136 | ||
137 | security_release_secctx(secctx, len); | |
138 | } | |
139 | #else | |
140 | static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) | |
141 | { | |
142 | } | |
143 | #endif | |
144 | ||
145 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
146 | static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct, | |
147 | int dir) | |
148 | { | |
149 | const struct nf_conntrack_zone *zone = nf_ct_zone(ct); | |
150 | ||
151 | if (zone->dir != dir) | |
152 | return; | |
153 | switch (zone->dir) { | |
154 | case NF_CT_DEFAULT_ZONE_DIR: | |
155 | seq_printf(s, "zone=%u ", zone->id); | |
156 | break; | |
157 | case NF_CT_ZONE_DIR_ORIG: | |
158 | seq_printf(s, "zone-orig=%u ", zone->id); | |
159 | break; | |
160 | case NF_CT_ZONE_DIR_REPL: | |
161 | seq_printf(s, "zone-reply=%u ", zone->id); | |
162 | break; | |
163 | default: | |
164 | break; | |
165 | } | |
166 | } | |
167 | #else | |
168 | static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct, | |
169 | int dir) | |
170 | { | |
171 | } | |
172 | #endif | |
173 | ||
174 | #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP | |
175 | static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) | |
176 | { | |
177 | struct ct_iter_state *st = s->private; | |
178 | struct nf_conn_tstamp *tstamp; | |
179 | s64 delta_time; | |
180 | ||
181 | tstamp = nf_conn_tstamp_find(ct); | |
182 | if (tstamp) { | |
183 | delta_time = st->time_now - tstamp->start; | |
184 | if (delta_time > 0) | |
185 | delta_time = div_s64(delta_time, NSEC_PER_SEC); | |
186 | else | |
187 | delta_time = 0; | |
188 | ||
189 | seq_printf(s, "delta-time=%llu ", | |
190 | (unsigned long long)delta_time); | |
191 | } | |
192 | return; | |
193 | } | |
194 | #else | |
195 | static inline void | |
196 | ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) | |
197 | { | |
198 | } | |
199 | #endif | |
200 | ||
201 | /* return 0 on success, 1 in case of error */ | |
202 | static int ct_seq_show(struct seq_file *s, void *v) | |
203 | { | |
204 | struct nf_conntrack_tuple_hash *hash = v; | |
205 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash); | |
206 | const struct nf_conntrack_l3proto *l3proto; | |
207 | const struct nf_conntrack_l4proto *l4proto; | |
208 | struct net *net = seq_file_net(s); | |
209 | int ret = 0; | |
210 | ||
211 | NF_CT_ASSERT(ct); | |
212 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) | |
213 | return 0; | |
214 | ||
215 | if (nf_ct_should_gc(ct)) { | |
216 | nf_ct_kill(ct); | |
217 | goto release; | |
218 | } | |
219 | ||
220 | /* we only want to print DIR_ORIGINAL */ | |
221 | if (NF_CT_DIRECTION(hash)) | |
222 | goto release; | |
223 | ||
224 | if (!net_eq(nf_ct_net(ct), net)) | |
225 | goto release; | |
226 | ||
227 | l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); | |
228 | NF_CT_ASSERT(l3proto); | |
229 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); | |
230 | NF_CT_ASSERT(l4proto); | |
231 | ||
232 | ret = -ENOSPC; | |
233 | seq_printf(s, "%-8s %u %-8s %u %ld ", | |
234 | l3proto->name, nf_ct_l3num(ct), | |
235 | l4proto->name, nf_ct_protonum(ct), | |
236 | nf_ct_expires(ct) / HZ); | |
237 | ||
238 | if (l4proto->print_conntrack) | |
239 | l4proto->print_conntrack(s, ct); | |
240 | ||
241 | print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
242 | l3proto, l4proto); | |
243 | ||
244 | ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG); | |
245 | ||
246 | if (seq_has_overflowed(s)) | |
247 | goto release; | |
248 | ||
249 | if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL)) | |
250 | goto release; | |
251 | ||
252 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status))) | |
253 | seq_puts(s, "[UNREPLIED] "); | |
254 | ||
255 | print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, | |
256 | l3proto, l4proto); | |
257 | ||
258 | ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL); | |
259 | ||
260 | if (seq_print_acct(s, ct, IP_CT_DIR_REPLY)) | |
261 | goto release; | |
262 | ||
263 | if (test_bit(IPS_ASSURED_BIT, &ct->status)) | |
264 | seq_puts(s, "[ASSURED] "); | |
265 | ||
266 | if (seq_has_overflowed(s)) | |
267 | goto release; | |
268 | ||
269 | #if defined(CONFIG_NF_CONNTRACK_MARK) | |
270 | seq_printf(s, "mark=%u ", ct->mark); | |
271 | #endif | |
272 | ||
273 | ct_show_secctx(s, ct); | |
274 | ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR); | |
275 | ct_show_delta_time(s, ct); | |
276 | ||
277 | seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)); | |
278 | ||
279 | if (seq_has_overflowed(s)) | |
280 | goto release; | |
281 | ||
282 | ret = 0; | |
283 | release: | |
284 | nf_ct_put(ct); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static const struct seq_operations ct_seq_ops = { | |
289 | .start = ct_seq_start, | |
290 | .next = ct_seq_next, | |
291 | .stop = ct_seq_stop, | |
292 | .show = ct_seq_show | |
293 | }; | |
294 | ||
295 | static int ct_open(struct inode *inode, struct file *file) | |
296 | { | |
297 | return seq_open_net(inode, file, &ct_seq_ops, | |
298 | sizeof(struct ct_iter_state)); | |
299 | } | |
300 | ||
301 | static const struct file_operations ct_file_ops = { | |
302 | .owner = THIS_MODULE, | |
303 | .open = ct_open, | |
304 | .read = seq_read, | |
305 | .llseek = seq_lseek, | |
306 | .release = seq_release_net, | |
307 | }; | |
308 | ||
309 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
310 | { | |
311 | struct net *net = seq_file_net(seq); | |
312 | int cpu; | |
313 | ||
314 | if (*pos == 0) | |
315 | return SEQ_START_TOKEN; | |
316 | ||
317 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { | |
318 | if (!cpu_possible(cpu)) | |
319 | continue; | |
320 | *pos = cpu + 1; | |
321 | return per_cpu_ptr(net->ct.stat, cpu); | |
322 | } | |
323 | ||
324 | return NULL; | |
325 | } | |
326 | ||
327 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
328 | { | |
329 | struct net *net = seq_file_net(seq); | |
330 | int cpu; | |
331 | ||
332 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { | |
333 | if (!cpu_possible(cpu)) | |
334 | continue; | |
335 | *pos = cpu + 1; | |
336 | return per_cpu_ptr(net->ct.stat, cpu); | |
337 | } | |
338 | ||
339 | return NULL; | |
340 | } | |
341 | ||
342 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) | |
343 | { | |
344 | } | |
345 | ||
346 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) | |
347 | { | |
348 | struct net *net = seq_file_net(seq); | |
349 | unsigned int nr_conntracks = atomic_read(&net->ct.count); | |
350 | const struct ip_conntrack_stat *st = v; | |
351 | ||
352 | if (v == SEQ_START_TOKEN) { | |
353 | seq_puts(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete search_restart\n"); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " | |
358 | "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
359 | nr_conntracks, | |
360 | 0, | |
361 | st->found, | |
362 | 0, | |
363 | st->invalid, | |
364 | st->ignore, | |
365 | 0, | |
366 | 0, | |
367 | st->insert, | |
368 | st->insert_failed, | |
369 | st->drop, | |
370 | st->early_drop, | |
371 | st->error, | |
372 | ||
373 | st->expect_new, | |
374 | st->expect_create, | |
375 | st->expect_delete, | |
376 | st->search_restart | |
377 | ); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static const struct seq_operations ct_cpu_seq_ops = { | |
382 | .start = ct_cpu_seq_start, | |
383 | .next = ct_cpu_seq_next, | |
384 | .stop = ct_cpu_seq_stop, | |
385 | .show = ct_cpu_seq_show, | |
386 | }; | |
387 | ||
388 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) | |
389 | { | |
390 | return seq_open_net(inode, file, &ct_cpu_seq_ops, | |
391 | sizeof(struct seq_net_private)); | |
392 | } | |
393 | ||
394 | static const struct file_operations ct_cpu_seq_fops = { | |
395 | .owner = THIS_MODULE, | |
396 | .open = ct_cpu_seq_open, | |
397 | .read = seq_read, | |
398 | .llseek = seq_lseek, | |
399 | .release = seq_release_net, | |
400 | }; | |
401 | ||
402 | static int nf_conntrack_standalone_init_proc(struct net *net) | |
403 | { | |
404 | struct proc_dir_entry *pde; | |
405 | kuid_t root_uid; | |
406 | kgid_t root_gid; | |
407 | ||
408 | pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops); | |
409 | if (!pde) | |
410 | goto out_nf_conntrack; | |
411 | ||
412 | root_uid = make_kuid(net->user_ns, 0); | |
413 | root_gid = make_kgid(net->user_ns, 0); | |
414 | if (uid_valid(root_uid) && gid_valid(root_gid)) | |
415 | proc_set_user(pde, root_uid, root_gid); | |
416 | ||
417 | pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat, | |
418 | &ct_cpu_seq_fops); | |
419 | if (!pde) | |
420 | goto out_stat_nf_conntrack; | |
421 | return 0; | |
422 | ||
423 | out_stat_nf_conntrack: | |
424 | remove_proc_entry("nf_conntrack", net->proc_net); | |
425 | out_nf_conntrack: | |
426 | return -ENOMEM; | |
427 | } | |
428 | ||
429 | static void nf_conntrack_standalone_fini_proc(struct net *net) | |
430 | { | |
431 | remove_proc_entry("nf_conntrack", net->proc_net_stat); | |
432 | remove_proc_entry("nf_conntrack", net->proc_net); | |
433 | } | |
434 | #else | |
435 | static int nf_conntrack_standalone_init_proc(struct net *net) | |
436 | { | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void nf_conntrack_standalone_fini_proc(struct net *net) | |
441 | { | |
442 | } | |
443 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ | |
444 | ||
445 | /* Sysctl support */ | |
446 | ||
447 | #ifdef CONFIG_SYSCTL | |
448 | /* Log invalid packets of a given protocol */ | |
449 | static int log_invalid_proto_min __read_mostly; | |
450 | static int log_invalid_proto_max __read_mostly = 255; | |
451 | ||
452 | /* size the user *wants to set */ | |
453 | static unsigned int nf_conntrack_htable_size_user __read_mostly; | |
454 | ||
455 | static int | |
456 | nf_conntrack_hash_sysctl(struct ctl_table *table, int write, | |
457 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
458 | { | |
459 | int ret; | |
460 | ||
461 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
462 | if (ret < 0 || !write) | |
463 | return ret; | |
464 | ||
465 | /* update ret, we might not be able to satisfy request */ | |
466 | ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user); | |
467 | ||
468 | /* update it to the actual value used by conntrack */ | |
469 | nf_conntrack_htable_size_user = nf_conntrack_htable_size; | |
470 | return ret; | |
471 | } | |
472 | ||
473 | static struct ctl_table_header *nf_ct_netfilter_header; | |
474 | ||
475 | static struct ctl_table nf_ct_sysctl_table[] = { | |
476 | { | |
477 | .procname = "nf_conntrack_max", | |
478 | .data = &nf_conntrack_max, | |
479 | .maxlen = sizeof(int), | |
480 | .mode = 0644, | |
481 | .proc_handler = proc_dointvec, | |
482 | }, | |
483 | { | |
484 | .procname = "nf_conntrack_count", | |
485 | .data = &init_net.ct.count, | |
486 | .maxlen = sizeof(int), | |
487 | .mode = 0444, | |
488 | .proc_handler = proc_dointvec, | |
489 | }, | |
490 | { | |
491 | .procname = "nf_conntrack_buckets", | |
492 | .data = &nf_conntrack_htable_size_user, | |
493 | .maxlen = sizeof(unsigned int), | |
494 | .mode = 0644, | |
495 | .proc_handler = nf_conntrack_hash_sysctl, | |
496 | }, | |
497 | { | |
498 | .procname = "nf_conntrack_checksum", | |
499 | .data = &init_net.ct.sysctl_checksum, | |
500 | .maxlen = sizeof(unsigned int), | |
501 | .mode = 0644, | |
502 | .proc_handler = proc_dointvec, | |
503 | }, | |
504 | { | |
505 | .procname = "nf_conntrack_log_invalid", | |
506 | .data = &init_net.ct.sysctl_log_invalid, | |
507 | .maxlen = sizeof(unsigned int), | |
508 | .mode = 0644, | |
509 | .proc_handler = proc_dointvec_minmax, | |
510 | .extra1 = &log_invalid_proto_min, | |
511 | .extra2 = &log_invalid_proto_max, | |
512 | }, | |
513 | { | |
514 | .procname = "nf_conntrack_expect_max", | |
515 | .data = &nf_ct_expect_max, | |
516 | .maxlen = sizeof(int), | |
517 | .mode = 0644, | |
518 | .proc_handler = proc_dointvec, | |
519 | }, | |
520 | { } | |
521 | }; | |
522 | ||
523 | static struct ctl_table nf_ct_netfilter_table[] = { | |
524 | { | |
525 | .procname = "nf_conntrack_max", | |
526 | .data = &nf_conntrack_max, | |
527 | .maxlen = sizeof(int), | |
528 | .mode = 0644, | |
529 | .proc_handler = proc_dointvec, | |
530 | }, | |
531 | { } | |
532 | }; | |
533 | ||
534 | static int nf_conntrack_standalone_init_sysctl(struct net *net) | |
535 | { | |
536 | struct ctl_table *table; | |
537 | ||
538 | table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table), | |
539 | GFP_KERNEL); | |
540 | if (!table) | |
541 | goto out_kmemdup; | |
542 | ||
543 | table[1].data = &net->ct.count; | |
544 | table[3].data = &net->ct.sysctl_checksum; | |
545 | table[4].data = &net->ct.sysctl_log_invalid; | |
546 | ||
547 | /* Don't export sysctls to unprivileged users */ | |
548 | if (net->user_ns != &init_user_ns) | |
549 | table[0].procname = NULL; | |
550 | ||
551 | if (!net_eq(&init_net, net)) | |
552 | table[2].mode = 0444; | |
553 | ||
554 | net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table); | |
555 | if (!net->ct.sysctl_header) | |
556 | goto out_unregister_netfilter; | |
557 | ||
558 | return 0; | |
559 | ||
560 | out_unregister_netfilter: | |
561 | kfree(table); | |
562 | out_kmemdup: | |
563 | return -ENOMEM; | |
564 | } | |
565 | ||
566 | static void nf_conntrack_standalone_fini_sysctl(struct net *net) | |
567 | { | |
568 | struct ctl_table *table; | |
569 | ||
570 | table = net->ct.sysctl_header->ctl_table_arg; | |
571 | unregister_net_sysctl_table(net->ct.sysctl_header); | |
572 | kfree(table); | |
573 | } | |
574 | #else | |
575 | static int nf_conntrack_standalone_init_sysctl(struct net *net) | |
576 | { | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static void nf_conntrack_standalone_fini_sysctl(struct net *net) | |
581 | { | |
582 | } | |
583 | #endif /* CONFIG_SYSCTL */ | |
584 | ||
585 | static int nf_conntrack_pernet_init(struct net *net) | |
586 | { | |
587 | int ret; | |
588 | ||
589 | ret = nf_conntrack_init_net(net); | |
590 | if (ret < 0) | |
591 | goto out_init; | |
592 | ||
593 | ret = nf_conntrack_standalone_init_proc(net); | |
594 | if (ret < 0) | |
595 | goto out_proc; | |
596 | ||
597 | net->ct.sysctl_checksum = 1; | |
598 | net->ct.sysctl_log_invalid = 0; | |
599 | ret = nf_conntrack_standalone_init_sysctl(net); | |
600 | if (ret < 0) | |
601 | goto out_sysctl; | |
602 | ||
603 | return 0; | |
604 | ||
605 | out_sysctl: | |
606 | nf_conntrack_standalone_fini_proc(net); | |
607 | out_proc: | |
608 | nf_conntrack_cleanup_net(net); | |
609 | out_init: | |
610 | return ret; | |
611 | } | |
612 | ||
613 | static void nf_conntrack_pernet_exit(struct list_head *net_exit_list) | |
614 | { | |
615 | struct net *net; | |
616 | ||
617 | list_for_each_entry(net, net_exit_list, exit_list) { | |
618 | nf_conntrack_standalone_fini_sysctl(net); | |
619 | nf_conntrack_standalone_fini_proc(net); | |
620 | } | |
621 | nf_conntrack_cleanup_net_list(net_exit_list); | |
622 | } | |
623 | ||
624 | static struct pernet_operations nf_conntrack_net_ops = { | |
625 | .init = nf_conntrack_pernet_init, | |
626 | .exit_batch = nf_conntrack_pernet_exit, | |
627 | }; | |
628 | ||
629 | static int __init nf_conntrack_standalone_init(void) | |
630 | { | |
631 | int ret = nf_conntrack_init_start(); | |
632 | if (ret < 0) | |
633 | goto out_start; | |
634 | ||
635 | BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK); | |
636 | BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER); | |
637 | ||
638 | #ifdef CONFIG_SYSCTL | |
639 | nf_ct_netfilter_header = | |
640 | register_net_sysctl(&init_net, "net", nf_ct_netfilter_table); | |
641 | if (!nf_ct_netfilter_header) { | |
642 | pr_err("nf_conntrack: can't register to sysctl.\n"); | |
643 | ret = -ENOMEM; | |
644 | goto out_sysctl; | |
645 | } | |
646 | ||
647 | nf_conntrack_htable_size_user = nf_conntrack_htable_size; | |
648 | #endif | |
649 | ||
650 | ret = register_pernet_subsys(&nf_conntrack_net_ops); | |
651 | if (ret < 0) | |
652 | goto out_pernet; | |
653 | ||
654 | nf_conntrack_init_end(); | |
655 | return 0; | |
656 | ||
657 | out_pernet: | |
658 | #ifdef CONFIG_SYSCTL | |
659 | unregister_net_sysctl_table(nf_ct_netfilter_header); | |
660 | out_sysctl: | |
661 | #endif | |
662 | nf_conntrack_cleanup_end(); | |
663 | out_start: | |
664 | return ret; | |
665 | } | |
666 | ||
667 | static void __exit nf_conntrack_standalone_fini(void) | |
668 | { | |
669 | nf_conntrack_cleanup_start(); | |
670 | unregister_pernet_subsys(&nf_conntrack_net_ops); | |
671 | #ifdef CONFIG_SYSCTL | |
672 | unregister_net_sysctl_table(nf_ct_netfilter_header); | |
673 | #endif | |
674 | nf_conntrack_cleanup_end(); | |
675 | } | |
676 | ||
677 | module_init(nf_conntrack_standalone_init); | |
678 | module_exit(nf_conntrack_standalone_fini); | |
679 | ||
680 | /* Some modules need us, but don't depend directly on any symbol. | |
681 | They should call this. */ | |
682 | void need_conntrack(void) | |
683 | { | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(need_conntrack); |