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Commit | Line | Data |
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9fb9cbb1 YK |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
7 | */ |
8 | ||
9fb9cbb1 YK |
9 | #include <linux/types.h> |
10 | #include <linux/netfilter.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/seq_file.h> | |
15 | #include <linux/percpu.h> | |
16 | #include <linux/netdevice.h> | |
457c4cbc | 17 | #include <net/net_namespace.h> |
9fb9cbb1 YK |
18 | #ifdef CONFIG_SYSCTL |
19 | #include <linux/sysctl.h> | |
20 | #endif | |
21 | ||
9fb9cbb1 | 22 | #include <net/netfilter/nf_conntrack.h> |
f6180121 | 23 | #include <net/netfilter/nf_conntrack_core.h> |
9fb9cbb1 | 24 | #include <net/netfilter/nf_conntrack_l3proto.h> |
605dcad6 | 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
77ab9cff | 26 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 | 27 | #include <net/netfilter/nf_conntrack_helper.h> |
58401572 | 28 | #include <net/netfilter/nf_conntrack_acct.h> |
9fb9cbb1 | 29 | |
9fb9cbb1 YK |
30 | MODULE_LICENSE("GPL"); |
31 | ||
9fb9cbb1 | 32 | #ifdef CONFIG_PROC_FS |
77ab9cff | 33 | int |
9fb9cbb1 | 34 | print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, |
32948588 JE |
35 | const struct nf_conntrack_l3proto *l3proto, |
36 | const struct nf_conntrack_l4proto *l4proto) | |
9fb9cbb1 | 37 | { |
605dcad6 | 38 | return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple); |
9fb9cbb1 | 39 | } |
e4bd8bce | 40 | EXPORT_SYMBOL_GPL(print_tuple); |
9fb9cbb1 | 41 | |
9fb9cbb1 YK |
42 | struct ct_iter_state { |
43 | unsigned int bucket; | |
44 | }; | |
45 | ||
f205c5e0 | 46 | static struct hlist_node *ct_get_first(struct seq_file *seq) |
9fb9cbb1 YK |
47 | { |
48 | struct ct_iter_state *st = seq->private; | |
76507f69 | 49 | struct hlist_node *n; |
9fb9cbb1 YK |
50 | |
51 | for (st->bucket = 0; | |
52 | st->bucket < nf_conntrack_htable_size; | |
53 | st->bucket++) { | |
76507f69 PM |
54 | n = rcu_dereference(nf_conntrack_hash[st->bucket].first); |
55 | if (n) | |
56 | return n; | |
9fb9cbb1 YK |
57 | } |
58 | return NULL; | |
59 | } | |
60 | ||
f205c5e0 PM |
61 | static struct hlist_node *ct_get_next(struct seq_file *seq, |
62 | struct hlist_node *head) | |
9fb9cbb1 YK |
63 | { |
64 | struct ct_iter_state *st = seq->private; | |
65 | ||
76507f69 | 66 | head = rcu_dereference(head->next); |
f205c5e0 | 67 | while (head == NULL) { |
9fb9cbb1 YK |
68 | if (++st->bucket >= nf_conntrack_htable_size) |
69 | return NULL; | |
76507f69 | 70 | head = rcu_dereference(nf_conntrack_hash[st->bucket].first); |
9fb9cbb1 YK |
71 | } |
72 | return head; | |
73 | } | |
74 | ||
f205c5e0 | 75 | static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos) |
9fb9cbb1 | 76 | { |
f205c5e0 | 77 | struct hlist_node *head = ct_get_first(seq); |
9fb9cbb1 YK |
78 | |
79 | if (head) | |
80 | while (pos && (head = ct_get_next(seq, head))) | |
81 | pos--; | |
82 | return pos ? NULL : head; | |
83 | } | |
84 | ||
85 | static void *ct_seq_start(struct seq_file *seq, loff_t *pos) | |
76507f69 | 86 | __acquires(RCU) |
9fb9cbb1 | 87 | { |
76507f69 | 88 | rcu_read_lock(); |
9fb9cbb1 YK |
89 | return ct_get_idx(seq, *pos); |
90 | } | |
91 | ||
92 | static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
93 | { | |
94 | (*pos)++; | |
95 | return ct_get_next(s, v); | |
96 | } | |
97 | ||
98 | static void ct_seq_stop(struct seq_file *s, void *v) | |
76507f69 | 99 | __releases(RCU) |
9fb9cbb1 | 100 | { |
76507f69 | 101 | rcu_read_unlock(); |
9fb9cbb1 YK |
102 | } |
103 | ||
104 | /* return 0 on success, 1 in case of error */ | |
105 | static int ct_seq_show(struct seq_file *s, void *v) | |
106 | { | |
107 | const struct nf_conntrack_tuple_hash *hash = v; | |
c88130bc | 108 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash); |
32948588 JE |
109 | const struct nf_conntrack_l3proto *l3proto; |
110 | const struct nf_conntrack_l4proto *l4proto; | |
9fb9cbb1 | 111 | |
c88130bc | 112 | NF_CT_ASSERT(ct); |
9fb9cbb1 YK |
113 | |
114 | /* we only want to print DIR_ORIGINAL */ | |
115 | if (NF_CT_DIRECTION(hash)) | |
116 | return 0; | |
117 | ||
5e8fbe2a | 118 | l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); |
9fb9cbb1 | 119 | NF_CT_ASSERT(l3proto); |
5e8fbe2a | 120 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
605dcad6 | 121 | NF_CT_ASSERT(l4proto); |
9fb9cbb1 YK |
122 | |
123 | if (seq_printf(s, "%-8s %u %-8s %u %ld ", | |
5e8fbe2a PM |
124 | l3proto->name, nf_ct_l3num(ct), |
125 | l4proto->name, nf_ct_protonum(ct), | |
c88130bc PM |
126 | timer_pending(&ct->timeout) |
127 | ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0) | |
9fb9cbb1 YK |
128 | return -ENOSPC; |
129 | ||
c88130bc | 130 | if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct)) |
9fb9cbb1 YK |
131 | return -ENOSPC; |
132 | ||
c88130bc | 133 | if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
605dcad6 | 134 | l3proto, l4proto)) |
9fb9cbb1 YK |
135 | return -ENOSPC; |
136 | ||
58401572 | 137 | if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL)) |
9fb9cbb1 YK |
138 | return -ENOSPC; |
139 | ||
c88130bc | 140 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status))) |
9fb9cbb1 YK |
141 | if (seq_printf(s, "[UNREPLIED] ")) |
142 | return -ENOSPC; | |
143 | ||
c88130bc | 144 | if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
605dcad6 | 145 | l3proto, l4proto)) |
9fb9cbb1 YK |
146 | return -ENOSPC; |
147 | ||
58401572 | 148 | if (seq_print_acct(s, ct, IP_CT_DIR_REPLY)) |
9fb9cbb1 YK |
149 | return -ENOSPC; |
150 | ||
c88130bc | 151 | if (test_bit(IPS_ASSURED_BIT, &ct->status)) |
9fb9cbb1 YK |
152 | if (seq_printf(s, "[ASSURED] ")) |
153 | return -ENOSPC; | |
154 | ||
155 | #if defined(CONFIG_NF_CONNTRACK_MARK) | |
c88130bc | 156 | if (seq_printf(s, "mark=%u ", ct->mark)) |
9fb9cbb1 YK |
157 | return -ENOSPC; |
158 | #endif | |
159 | ||
7c9728c3 | 160 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
c88130bc | 161 | if (seq_printf(s, "secmark=%u ", ct->secmark)) |
7c9728c3 JM |
162 | return -ENOSPC; |
163 | #endif | |
164 | ||
c88130bc | 165 | if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use))) |
9fb9cbb1 | 166 | return -ENOSPC; |
a5d29264 | 167 | |
9fb9cbb1 YK |
168 | return 0; |
169 | } | |
170 | ||
56b3d975 | 171 | static const struct seq_operations ct_seq_ops = { |
9fb9cbb1 YK |
172 | .start = ct_seq_start, |
173 | .next = ct_seq_next, | |
174 | .stop = ct_seq_stop, | |
175 | .show = ct_seq_show | |
176 | }; | |
177 | ||
178 | static int ct_open(struct inode *inode, struct file *file) | |
179 | { | |
e2da5913 PE |
180 | return seq_open_private(file, &ct_seq_ops, |
181 | sizeof(struct ct_iter_state)); | |
9fb9cbb1 YK |
182 | } |
183 | ||
da7071d7 | 184 | static const struct file_operations ct_file_ops = { |
9fb9cbb1 YK |
185 | .owner = THIS_MODULE, |
186 | .open = ct_open, | |
187 | .read = seq_read, | |
188 | .llseek = seq_lseek, | |
189 | .release = seq_release_private, | |
190 | }; | |
191 | ||
9fb9cbb1 YK |
192 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
193 | { | |
194 | int cpu; | |
195 | ||
196 | if (*pos == 0) | |
197 | return SEQ_START_TOKEN; | |
198 | ||
199 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
200 | if (!cpu_possible(cpu)) | |
201 | continue; | |
202 | *pos = cpu + 1; | |
203 | return &per_cpu(nf_conntrack_stat, cpu); | |
204 | } | |
205 | ||
206 | return NULL; | |
207 | } | |
208 | ||
209 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
210 | { | |
211 | int cpu; | |
212 | ||
213 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
214 | if (!cpu_possible(cpu)) | |
215 | continue; | |
216 | *pos = cpu + 1; | |
217 | return &per_cpu(nf_conntrack_stat, cpu); | |
218 | } | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
223 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) | |
224 | { | |
225 | } | |
226 | ||
227 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) | |
228 | { | |
229 | unsigned int nr_conntracks = atomic_read(&nf_conntrack_count); | |
32948588 | 230 | const struct ip_conntrack_stat *st = v; |
9fb9cbb1 YK |
231 | |
232 | if (v == SEQ_START_TOKEN) { | |
233 | seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete\n"); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " | |
238 | "%08x %08x %08x %08x %08x %08x %08x %08x \n", | |
239 | nr_conntracks, | |
240 | st->searched, | |
241 | st->found, | |
242 | st->new, | |
243 | st->invalid, | |
244 | st->ignore, | |
245 | st->delete, | |
246 | st->delete_list, | |
247 | st->insert, | |
248 | st->insert_failed, | |
249 | st->drop, | |
250 | st->early_drop, | |
251 | st->error, | |
252 | ||
253 | st->expect_new, | |
254 | st->expect_create, | |
255 | st->expect_delete | |
256 | ); | |
257 | return 0; | |
258 | } | |
259 | ||
56b3d975 | 260 | static const struct seq_operations ct_cpu_seq_ops = { |
9fb9cbb1 YK |
261 | .start = ct_cpu_seq_start, |
262 | .next = ct_cpu_seq_next, | |
263 | .stop = ct_cpu_seq_stop, | |
264 | .show = ct_cpu_seq_show, | |
265 | }; | |
266 | ||
267 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) | |
268 | { | |
269 | return seq_open(file, &ct_cpu_seq_ops); | |
270 | } | |
271 | ||
da7071d7 | 272 | static const struct file_operations ct_cpu_seq_fops = { |
9fb9cbb1 YK |
273 | .owner = THIS_MODULE, |
274 | .open = ct_cpu_seq_open, | |
275 | .read = seq_read, | |
276 | .llseek = seq_lseek, | |
665bba10 | 277 | .release = seq_release, |
9fb9cbb1 | 278 | }; |
b916f7d4 AD |
279 | |
280 | static int nf_conntrack_standalone_init_proc(void) | |
281 | { | |
282 | struct proc_dir_entry *pde; | |
283 | ||
284 | pde = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops); | |
285 | if (!pde) | |
286 | goto out_nf_conntrack; | |
52c0e111 DL |
287 | |
288 | pde = proc_create("nf_conntrack", S_IRUGO, init_net.proc_net_stat, | |
289 | &ct_cpu_seq_fops); | |
b916f7d4 AD |
290 | if (!pde) |
291 | goto out_stat_nf_conntrack; | |
b916f7d4 AD |
292 | return 0; |
293 | ||
294 | out_stat_nf_conntrack: | |
295 | proc_net_remove(&init_net, "nf_conntrack"); | |
296 | out_nf_conntrack: | |
297 | return -ENOMEM; | |
298 | } | |
299 | ||
300 | static void nf_conntrack_standalone_fini_proc(void) | |
301 | { | |
302 | remove_proc_entry("nf_conntrack", init_net.proc_net_stat); | |
303 | proc_net_remove(&init_net, "nf_conntrack"); | |
304 | } | |
305 | #else | |
306 | static int nf_conntrack_standalone_init_proc(void) | |
307 | { | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static void nf_conntrack_standalone_fini_proc(void) | |
312 | { | |
313 | } | |
9fb9cbb1 YK |
314 | #endif /* CONFIG_PROC_FS */ |
315 | ||
316 | /* Sysctl support */ | |
317 | ||
94aec08e | 318 | int nf_conntrack_checksum __read_mostly = 1; |
13b18339 | 319 | EXPORT_SYMBOL_GPL(nf_conntrack_checksum); |
72b55823 | 320 | |
9fb9cbb1 | 321 | #ifdef CONFIG_SYSCTL |
9fb9cbb1 YK |
322 | /* Log invalid packets of a given protocol */ |
323 | static int log_invalid_proto_min = 0; | |
324 | static int log_invalid_proto_max = 255; | |
325 | ||
326 | static struct ctl_table_header *nf_ct_sysctl_header; | |
9714be7d | 327 | static struct ctl_table_header *nf_ct_netfilter_header; |
9fb9cbb1 YK |
328 | |
329 | static ctl_table nf_ct_sysctl_table[] = { | |
330 | { | |
331 | .ctl_name = NET_NF_CONNTRACK_MAX, | |
332 | .procname = "nf_conntrack_max", | |
333 | .data = &nf_conntrack_max, | |
334 | .maxlen = sizeof(int), | |
335 | .mode = 0644, | |
336 | .proc_handler = &proc_dointvec, | |
337 | }, | |
338 | { | |
339 | .ctl_name = NET_NF_CONNTRACK_COUNT, | |
340 | .procname = "nf_conntrack_count", | |
341 | .data = &nf_conntrack_count, | |
342 | .maxlen = sizeof(int), | |
343 | .mode = 0444, | |
344 | .proc_handler = &proc_dointvec, | |
345 | }, | |
346 | { | |
347 | .ctl_name = NET_NF_CONNTRACK_BUCKETS, | |
348 | .procname = "nf_conntrack_buckets", | |
349 | .data = &nf_conntrack_htable_size, | |
350 | .maxlen = sizeof(unsigned int), | |
351 | .mode = 0444, | |
352 | .proc_handler = &proc_dointvec, | |
353 | }, | |
39a27a35 PM |
354 | { |
355 | .ctl_name = NET_NF_CONNTRACK_CHECKSUM, | |
356 | .procname = "nf_conntrack_checksum", | |
357 | .data = &nf_conntrack_checksum, | |
358 | .maxlen = sizeof(unsigned int), | |
359 | .mode = 0644, | |
360 | .proc_handler = &proc_dointvec, | |
361 | }, | |
9fb9cbb1 YK |
362 | { |
363 | .ctl_name = NET_NF_CONNTRACK_LOG_INVALID, | |
364 | .procname = "nf_conntrack_log_invalid", | |
365 | .data = &nf_ct_log_invalid, | |
366 | .maxlen = sizeof(unsigned int), | |
367 | .mode = 0644, | |
368 | .proc_handler = &proc_dointvec_minmax, | |
369 | .strategy = &sysctl_intvec, | |
370 | .extra1 = &log_invalid_proto_min, | |
371 | .extra2 = &log_invalid_proto_max, | |
372 | }, | |
f264a7df PM |
373 | { |
374 | .ctl_name = CTL_UNNUMBERED, | |
375 | .procname = "nf_conntrack_expect_max", | |
376 | .data = &nf_ct_expect_max, | |
377 | .maxlen = sizeof(int), | |
378 | .mode = 0644, | |
379 | .proc_handler = &proc_dointvec, | |
380 | }, | |
9fb9cbb1 YK |
381 | { .ctl_name = 0 } |
382 | }; | |
383 | ||
384 | #define NET_NF_CONNTRACK_MAX 2089 | |
385 | ||
386 | static ctl_table nf_ct_netfilter_table[] = { | |
9fb9cbb1 YK |
387 | { |
388 | .ctl_name = NET_NF_CONNTRACK_MAX, | |
389 | .procname = "nf_conntrack_max", | |
390 | .data = &nf_conntrack_max, | |
391 | .maxlen = sizeof(int), | |
392 | .mode = 0644, | |
393 | .proc_handler = &proc_dointvec, | |
394 | }, | |
395 | { .ctl_name = 0 } | |
396 | }; | |
397 | ||
9e232495 | 398 | static struct ctl_path nf_ct_path[] = { |
3d7cc2ba PE |
399 | { .procname = "net", .ctl_name = CTL_NET, }, |
400 | { } | |
9fb9cbb1 | 401 | }; |
3d7cc2ba | 402 | |
13b18339 | 403 | EXPORT_SYMBOL_GPL(nf_ct_log_invalid); |
b916f7d4 AD |
404 | |
405 | static int nf_conntrack_standalone_init_sysctl(void) | |
406 | { | |
9714be7d | 407 | nf_ct_netfilter_header = |
b916f7d4 | 408 | register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table); |
9714be7d KPO |
409 | if (!nf_ct_netfilter_header) |
410 | goto out; | |
411 | ||
412 | nf_ct_sysctl_header = | |
413 | register_sysctl_paths(nf_net_netfilter_sysctl_path, | |
414 | nf_ct_sysctl_table); | |
415 | if (!nf_ct_sysctl_header) | |
416 | goto out_unregister_netfilter; | |
417 | ||
b916f7d4 AD |
418 | return 0; |
419 | ||
9714be7d KPO |
420 | out_unregister_netfilter: |
421 | unregister_sysctl_table(nf_ct_netfilter_header); | |
422 | out: | |
423 | printk("nf_conntrack: can't register to sysctl.\n"); | |
424 | return -ENOMEM; | |
b916f7d4 AD |
425 | } |
426 | ||
427 | static void nf_conntrack_standalone_fini_sysctl(void) | |
428 | { | |
9714be7d | 429 | unregister_sysctl_table(nf_ct_netfilter_header); |
b916f7d4 AD |
430 | unregister_sysctl_table(nf_ct_sysctl_header); |
431 | } | |
432 | #else | |
433 | static int nf_conntrack_standalone_init_sysctl(void) | |
434 | { | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static void nf_conntrack_standalone_fini_sysctl(void) | |
439 | { | |
440 | } | |
9fb9cbb1 YK |
441 | #endif /* CONFIG_SYSCTL */ |
442 | ||
dfdb8d79 AD |
443 | static int nf_conntrack_net_init(struct net *net) |
444 | { | |
445 | return nf_conntrack_init(net); | |
446 | } | |
447 | ||
448 | static void nf_conntrack_net_exit(struct net *net) | |
449 | { | |
450 | nf_conntrack_cleanup(net); | |
451 | } | |
452 | ||
453 | static struct pernet_operations nf_conntrack_net_ops = { | |
454 | .init = nf_conntrack_net_init, | |
455 | .exit = nf_conntrack_net_exit, | |
456 | }; | |
457 | ||
65b4b4e8 | 458 | static int __init nf_conntrack_standalone_init(void) |
9fb9cbb1 | 459 | { |
b916f7d4 | 460 | int ret; |
32292a7f | 461 | |
dfdb8d79 | 462 | ret = register_pernet_subsys(&nf_conntrack_net_ops); |
32292a7f | 463 | if (ret < 0) |
b916f7d4 AD |
464 | goto out; |
465 | ret = nf_conntrack_standalone_init_proc(); | |
466 | if (ret < 0) | |
467 | goto out_proc; | |
468 | ret = nf_conntrack_standalone_init_sysctl(); | |
469 | if (ret < 0) | |
470 | goto out_sysctl; | |
471 | return 0; | |
32292a7f | 472 | |
b916f7d4 AD |
473 | out_sysctl: |
474 | nf_conntrack_standalone_fini_proc(); | |
475 | out_proc: | |
dfdb8d79 | 476 | unregister_pernet_subsys(&nf_conntrack_net_ops); |
b916f7d4 | 477 | out: |
32292a7f | 478 | return ret; |
9fb9cbb1 YK |
479 | } |
480 | ||
65b4b4e8 | 481 | static void __exit nf_conntrack_standalone_fini(void) |
9fb9cbb1 | 482 | { |
b916f7d4 AD |
483 | nf_conntrack_standalone_fini_sysctl(); |
484 | nf_conntrack_standalone_fini_proc(); | |
dfdb8d79 | 485 | unregister_pernet_subsys(&nf_conntrack_net_ops); |
9fb9cbb1 YK |
486 | } |
487 | ||
65b4b4e8 AM |
488 | module_init(nf_conntrack_standalone_init); |
489 | module_exit(nf_conntrack_standalone_fini); | |
9fb9cbb1 YK |
490 | |
491 | /* Some modules need us, but don't depend directly on any symbol. | |
492 | They should call this. */ | |
2e4e6a17 | 493 | void need_conntrack(void) |
9fb9cbb1 YK |
494 | { |
495 | } | |
13b18339 | 496 | EXPORT_SYMBOL_GPL(need_conntrack); |