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.
7 */
8
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>
17 #include <net/net_namespace.h>
18 #ifdef CONFIG_SYSCTL
19 #include <linux/sysctl.h>
20 #endif
21
22 #include <net/netfilter/nf_conntrack.h>
23 #include <net/netfilter/nf_conntrack_core.h>
24 #include <net/netfilter/nf_conntrack_l3proto.h>
25 #include <net/netfilter/nf_conntrack_l4proto.h>
26 #include <net/netfilter/nf_conntrack_expect.h>
27 #include <net/netfilter/nf_conntrack_helper.h>
28 #include <net/netfilter/nf_conntrack_acct.h>
29
30 MODULE_LICENSE("GPL");
31
32 #ifdef CONFIG_PROC_FS
33 int
34 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
35 const struct nf_conntrack_l3proto *l3proto,
36 const struct nf_conntrack_l4proto *l4proto)
37 {
38 return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
39 }
40 EXPORT_SYMBOL_GPL(print_tuple);
41
42 struct ct_iter_state {
43 struct seq_net_private p;
44 unsigned int bucket;
45 };
46
47 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
48 {
49 struct net *net = seq_file_net(seq);
50 struct ct_iter_state *st = seq->private;
51 struct hlist_nulls_node *n;
52
53 for (st->bucket = 0;
54 st->bucket < nf_conntrack_htable_size;
55 st->bucket++) {
56 n = rcu_dereference(net->ct.hash[st->bucket].first);
57 if (!is_a_nulls(n))
58 return n;
59 }
60 return NULL;
61 }
62
63 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
64 struct hlist_nulls_node *head)
65 {
66 struct net *net = seq_file_net(seq);
67 struct ct_iter_state *st = seq->private;
68
69 head = rcu_dereference(head->next);
70 while (is_a_nulls(head)) {
71 if (likely(get_nulls_value(head) == st->bucket)) {
72 if (++st->bucket >= nf_conntrack_htable_size)
73 return NULL;
74 }
75 head = rcu_dereference(net->ct.hash[st->bucket].first);
76 }
77 return head;
78 }
79
80 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
81 {
82 struct hlist_nulls_node *head = ct_get_first(seq);
83
84 if (head)
85 while (pos && (head = ct_get_next(seq, head)))
86 pos--;
87 return pos ? NULL : head;
88 }
89
90 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
91 __acquires(RCU)
92 {
93 rcu_read_lock();
94 return ct_get_idx(seq, *pos);
95 }
96
97 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
98 {
99 (*pos)++;
100 return ct_get_next(s, v);
101 }
102
103 static void ct_seq_stop(struct seq_file *s, void *v)
104 __releases(RCU)
105 {
106 rcu_read_unlock();
107 }
108
109 /* return 0 on success, 1 in case of error */
110 static int ct_seq_show(struct seq_file *s, void *v)
111 {
112 struct nf_conntrack_tuple_hash *hash = v;
113 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
114 const struct nf_conntrack_l3proto *l3proto;
115 const struct nf_conntrack_l4proto *l4proto;
116 int ret = 0;
117
118 NF_CT_ASSERT(ct);
119 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
120 return 0;
121
122 /* we only want to print DIR_ORIGINAL */
123 if (NF_CT_DIRECTION(hash))
124 goto release;
125
126 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
127 NF_CT_ASSERT(l3proto);
128 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
129 NF_CT_ASSERT(l4proto);
130
131 ret = -ENOSPC;
132 if (seq_printf(s, "%-8s %u %-8s %u %ld ",
133 l3proto->name, nf_ct_l3num(ct),
134 l4proto->name, nf_ct_protonum(ct),
135 timer_pending(&ct->timeout)
136 ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
137 goto release;
138
139 if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
140 goto release;
141
142 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
143 l3proto, l4proto))
144 goto release;
145
146 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
147 goto release;
148
149 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
150 if (seq_printf(s, "[UNREPLIED] "))
151 goto release;
152
153 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
154 l3proto, l4proto))
155 goto release;
156
157 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
158 goto release;
159
160 if (test_bit(IPS_ASSURED_BIT, &ct->status))
161 if (seq_printf(s, "[ASSURED] "))
162 goto release;
163
164 #if defined(CONFIG_NF_CONNTRACK_MARK)
165 if (seq_printf(s, "mark=%u ", ct->mark))
166 goto release;
167 #endif
168
169 #ifdef CONFIG_NF_CONNTRACK_SECMARK
170 if (seq_printf(s, "secmark=%u ", ct->secmark))
171 goto release;
172 #endif
173
174 if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
175 goto release;
176
177 ret = 0;
178 release:
179 nf_ct_put(ct);
180 return 0;
181 }
182
183 static const struct seq_operations ct_seq_ops = {
184 .start = ct_seq_start,
185 .next = ct_seq_next,
186 .stop = ct_seq_stop,
187 .show = ct_seq_show
188 };
189
190 static int ct_open(struct inode *inode, struct file *file)
191 {
192 return seq_open_net(inode, file, &ct_seq_ops,
193 sizeof(struct ct_iter_state));
194 }
195
196 static const struct file_operations ct_file_ops = {
197 .owner = THIS_MODULE,
198 .open = ct_open,
199 .read = seq_read,
200 .llseek = seq_lseek,
201 .release = seq_release_net,
202 };
203
204 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
205 {
206 struct net *net = seq_file_net(seq);
207 int cpu;
208
209 if (*pos == 0)
210 return SEQ_START_TOKEN;
211
212 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
213 if (!cpu_possible(cpu))
214 continue;
215 *pos = cpu + 1;
216 return per_cpu_ptr(net->ct.stat, cpu);
217 }
218
219 return NULL;
220 }
221
222 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
223 {
224 struct net *net = seq_file_net(seq);
225 int cpu;
226
227 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
228 if (!cpu_possible(cpu))
229 continue;
230 *pos = cpu + 1;
231 return per_cpu_ptr(net->ct.stat, cpu);
232 }
233
234 return NULL;
235 }
236
237 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
238 {
239 }
240
241 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
242 {
243 struct net *net = seq_file_net(seq);
244 unsigned int nr_conntracks = atomic_read(&net->ct.count);
245 const struct ip_conntrack_stat *st = v;
246
247 if (v == SEQ_START_TOKEN) {
248 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");
249 return 0;
250 }
251
252 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
253 "%08x %08x %08x %08x %08x %08x %08x %08x \n",
254 nr_conntracks,
255 st->searched,
256 st->found,
257 st->new,
258 st->invalid,
259 st->ignore,
260 st->delete,
261 st->delete_list,
262 st->insert,
263 st->insert_failed,
264 st->drop,
265 st->early_drop,
266 st->error,
267
268 st->expect_new,
269 st->expect_create,
270 st->expect_delete
271 );
272 return 0;
273 }
274
275 static const struct seq_operations ct_cpu_seq_ops = {
276 .start = ct_cpu_seq_start,
277 .next = ct_cpu_seq_next,
278 .stop = ct_cpu_seq_stop,
279 .show = ct_cpu_seq_show,
280 };
281
282 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
283 {
284 return seq_open_net(inode, file, &ct_cpu_seq_ops,
285 sizeof(struct seq_net_private));
286 }
287
288 static const struct file_operations ct_cpu_seq_fops = {
289 .owner = THIS_MODULE,
290 .open = ct_cpu_seq_open,
291 .read = seq_read,
292 .llseek = seq_lseek,
293 .release = seq_release_net,
294 };
295
296 static int nf_conntrack_standalone_init_proc(struct net *net)
297 {
298 struct proc_dir_entry *pde;
299
300 pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
301 if (!pde)
302 goto out_nf_conntrack;
303
304 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
305 &ct_cpu_seq_fops);
306 if (!pde)
307 goto out_stat_nf_conntrack;
308 return 0;
309
310 out_stat_nf_conntrack:
311 proc_net_remove(net, "nf_conntrack");
312 out_nf_conntrack:
313 return -ENOMEM;
314 }
315
316 static void nf_conntrack_standalone_fini_proc(struct net *net)
317 {
318 remove_proc_entry("nf_conntrack", net->proc_net_stat);
319 proc_net_remove(net, "nf_conntrack");
320 }
321 #else
322 static int nf_conntrack_standalone_init_proc(struct net *net)
323 {
324 return 0;
325 }
326
327 static void nf_conntrack_standalone_fini_proc(struct net *net)
328 {
329 }
330 #endif /* CONFIG_PROC_FS */
331
332 /* Sysctl support */
333
334 #ifdef CONFIG_SYSCTL
335 /* Log invalid packets of a given protocol */
336 static int log_invalid_proto_min = 0;
337 static int log_invalid_proto_max = 255;
338
339 static struct ctl_table_header *nf_ct_netfilter_header;
340
341 static ctl_table nf_ct_sysctl_table[] = {
342 {
343 .ctl_name = NET_NF_CONNTRACK_MAX,
344 .procname = "nf_conntrack_max",
345 .data = &nf_conntrack_max,
346 .maxlen = sizeof(int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec,
349 },
350 {
351 .ctl_name = NET_NF_CONNTRACK_COUNT,
352 .procname = "nf_conntrack_count",
353 .data = &init_net.ct.count,
354 .maxlen = sizeof(int),
355 .mode = 0444,
356 .proc_handler = proc_dointvec,
357 },
358 {
359 .ctl_name = NET_NF_CONNTRACK_BUCKETS,
360 .procname = "nf_conntrack_buckets",
361 .data = &nf_conntrack_htable_size,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0444,
364 .proc_handler = proc_dointvec,
365 },
366 {
367 .ctl_name = NET_NF_CONNTRACK_CHECKSUM,
368 .procname = "nf_conntrack_checksum",
369 .data = &init_net.ct.sysctl_checksum,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .ctl_name = NET_NF_CONNTRACK_LOG_INVALID,
376 .procname = "nf_conntrack_log_invalid",
377 .data = &init_net.ct.sysctl_log_invalid,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_minmax,
381 .strategy = sysctl_intvec,
382 .extra1 = &log_invalid_proto_min,
383 .extra2 = &log_invalid_proto_max,
384 },
385 {
386 .ctl_name = CTL_UNNUMBERED,
387 .procname = "nf_conntrack_expect_max",
388 .data = &nf_ct_expect_max,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 { .ctl_name = 0 }
394 };
395
396 #define NET_NF_CONNTRACK_MAX 2089
397
398 static ctl_table nf_ct_netfilter_table[] = {
399 {
400 .ctl_name = NET_NF_CONNTRACK_MAX,
401 .procname = "nf_conntrack_max",
402 .data = &nf_conntrack_max,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 { .ctl_name = 0 }
408 };
409
410 static struct ctl_path nf_ct_path[] = {
411 { .procname = "net", .ctl_name = CTL_NET, },
412 { }
413 };
414
415 static int nf_conntrack_standalone_init_sysctl(struct net *net)
416 {
417 struct ctl_table *table;
418
419 if (net_eq(net, &init_net)) {
420 nf_ct_netfilter_header =
421 register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
422 if (!nf_ct_netfilter_header)
423 goto out;
424 }
425
426 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
427 GFP_KERNEL);
428 if (!table)
429 goto out_kmemdup;
430
431 table[1].data = &net->ct.count;
432 table[3].data = &net->ct.sysctl_checksum;
433 table[4].data = &net->ct.sysctl_log_invalid;
434
435 net->ct.sysctl_header = register_net_sysctl_table(net,
436 nf_net_netfilter_sysctl_path, table);
437 if (!net->ct.sysctl_header)
438 goto out_unregister_netfilter;
439
440 return 0;
441
442 out_unregister_netfilter:
443 kfree(table);
444 out_kmemdup:
445 if (net_eq(net, &init_net))
446 unregister_sysctl_table(nf_ct_netfilter_header);
447 out:
448 printk("nf_conntrack: can't register to sysctl.\n");
449 return -ENOMEM;
450 }
451
452 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
453 {
454 struct ctl_table *table;
455
456 if (net_eq(net, &init_net))
457 unregister_sysctl_table(nf_ct_netfilter_header);
458 table = net->ct.sysctl_header->ctl_table_arg;
459 unregister_net_sysctl_table(net->ct.sysctl_header);
460 kfree(table);
461 }
462 #else
463 static int nf_conntrack_standalone_init_sysctl(struct net *net)
464 {
465 return 0;
466 }
467
468 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
469 {
470 }
471 #endif /* CONFIG_SYSCTL */
472
473 static int nf_conntrack_net_init(struct net *net)
474 {
475 int ret;
476
477 ret = nf_conntrack_init(net);
478 if (ret < 0)
479 goto out_init;
480 ret = nf_conntrack_standalone_init_proc(net);
481 if (ret < 0)
482 goto out_proc;
483 net->ct.sysctl_checksum = 1;
484 net->ct.sysctl_log_invalid = 0;
485 ret = nf_conntrack_standalone_init_sysctl(net);
486 if (ret < 0)
487 goto out_sysctl;
488 return 0;
489
490 out_sysctl:
491 nf_conntrack_standalone_fini_proc(net);
492 out_proc:
493 nf_conntrack_cleanup(net);
494 out_init:
495 return ret;
496 }
497
498 static void nf_conntrack_net_exit(struct net *net)
499 {
500 nf_conntrack_standalone_fini_sysctl(net);
501 nf_conntrack_standalone_fini_proc(net);
502 nf_conntrack_cleanup(net);
503 }
504
505 static struct pernet_operations nf_conntrack_net_ops = {
506 .init = nf_conntrack_net_init,
507 .exit = nf_conntrack_net_exit,
508 };
509
510 static int __init nf_conntrack_standalone_init(void)
511 {
512 return register_pernet_subsys(&nf_conntrack_net_ops);
513 }
514
515 static void __exit nf_conntrack_standalone_fini(void)
516 {
517 unregister_pernet_subsys(&nf_conntrack_net_ops);
518 }
519
520 module_init(nf_conntrack_standalone_init);
521 module_exit(nf_conntrack_standalone_fini);
522
523 /* Some modules need us, but don't depend directly on any symbol.
524 They should call this. */
525 void need_conntrack(void)
526 {
527 }
528 EXPORT_SYMBOL_GPL(need_conntrack);
529
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