1
2
3
4
5
6
7
8
9#include <linux/types.h>
10#include <linux/netfilter.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/proc_fs.h>
15#include <linux/seq_file.h>
16#include <linux/percpu.h>
17#include <linux/netdevice.h>
18#include <linux/security.h>
19#include <net/net_namespace.h>
20#ifdef CONFIG_SYSCTL
21#include <linux/sysctl.h>
22#endif
23
24#include <net/netfilter/nf_conntrack.h>
25#include <net/netfilter/nf_conntrack_core.h>
26#include <net/netfilter/nf_conntrack_l3proto.h>
27#include <net/netfilter/nf_conntrack_l4proto.h>
28#include <net/netfilter/nf_conntrack_expect.h>
29#include <net/netfilter/nf_conntrack_helper.h>
30#include <net/netfilter/nf_conntrack_acct.h>
31#include <net/netfilter/nf_conntrack_zones.h>
32#include <net/netfilter/nf_conntrack_timestamp.h>
33#include <linux/rculist_nulls.h>
34
35MODULE_LICENSE("GPL");
36
37#ifdef CONFIG_NF_CONNTRACK_PROCFS
38int
39print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
40 const struct nf_conntrack_l3proto *l3proto,
41 const struct nf_conntrack_l4proto *l4proto)
42{
43 return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
44}
45EXPORT_SYMBOL_GPL(print_tuple);
46
47struct ct_iter_state {
48 struct seq_net_private p;
49 unsigned int bucket;
50 u_int64_t time_now;
51};
52
53static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
54{
55 struct net *net = seq_file_net(seq);
56 struct ct_iter_state *st = seq->private;
57 struct hlist_nulls_node *n;
58
59 for (st->bucket = 0;
60 st->bucket < net->ct.htable_size;
61 st->bucket++) {
62 n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
63 if (!is_a_nulls(n))
64 return n;
65 }
66 return NULL;
67}
68
69static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
70 struct hlist_nulls_node *head)
71{
72 struct net *net = seq_file_net(seq);
73 struct ct_iter_state *st = seq->private;
74
75 head = rcu_dereference(hlist_nulls_next_rcu(head));
76 while (is_a_nulls(head)) {
77 if (likely(get_nulls_value(head) == st->bucket)) {
78 if (++st->bucket >= net->ct.htable_size)
79 return NULL;
80 }
81 head = rcu_dereference(
82 hlist_nulls_first_rcu(
83 &net->ct.hash[st->bucket]));
84 }
85 return head;
86}
87
88static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
89{
90 struct hlist_nulls_node *head = ct_get_first(seq);
91
92 if (head)
93 while (pos && (head = ct_get_next(seq, head)))
94 pos--;
95 return pos ? NULL : head;
96}
97
98static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
99 __acquires(RCU)
100{
101 struct ct_iter_state *st = seq->private;
102
103 st->time_now = ktime_to_ns(ktime_get_real());
104 rcu_read_lock();
105 return ct_get_idx(seq, *pos);
106}
107
108static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
109{
110 (*pos)++;
111 return ct_get_next(s, v);
112}
113
114static void ct_seq_stop(struct seq_file *s, void *v)
115 __releases(RCU)
116{
117 rcu_read_unlock();
118}
119
120#ifdef CONFIG_NF_CONNTRACK_SECMARK
121static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
122{
123 int ret;
124 u32 len;
125 char *secctx;
126
127 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
128 if (ret)
129 return 0;
130
131 ret = seq_printf(s, "secctx=%s ", secctx);
132
133 security_release_secctx(secctx, len);
134 return ret;
135}
136#else
137static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
138{
139 return 0;
140}
141#endif
142
143#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
144static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
145{
146 struct ct_iter_state *st = s->private;
147 struct nf_conn_tstamp *tstamp;
148 s64 delta_time;
149
150 tstamp = nf_conn_tstamp_find(ct);
151 if (tstamp) {
152 delta_time = st->time_now - tstamp->start;
153 if (delta_time > 0)
154 delta_time = div_s64(delta_time, NSEC_PER_SEC);
155 else
156 delta_time = 0;
157
158 return seq_printf(s, "delta-time=%llu ",
159 (unsigned long long)delta_time);
160 }
161 return 0;
162}
163#else
164static inline int
165ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
166{
167 return 0;
168}
169#endif
170
171
172static int ct_seq_show(struct seq_file *s, void *v)
173{
174 struct nf_conntrack_tuple_hash *hash = v;
175 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
176 const struct nf_conntrack_l3proto *l3proto;
177 const struct nf_conntrack_l4proto *l4proto;
178 int ret = 0;
179
180 NF_CT_ASSERT(ct);
181 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
182 return 0;
183
184
185 if (NF_CT_DIRECTION(hash))
186 goto release;
187
188 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
189 NF_CT_ASSERT(l3proto);
190 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
191 NF_CT_ASSERT(l4proto);
192
193 ret = -ENOSPC;
194 if (seq_printf(s, "%-8s %u %-8s %u %ld ",
195 l3proto->name, nf_ct_l3num(ct),
196 l4proto->name, nf_ct_protonum(ct),
197 timer_pending(&ct->timeout)
198 ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
199 goto release;
200
201 if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
202 goto release;
203
204 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
205 l3proto, l4proto))
206 goto release;
207
208 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
209 goto release;
210
211 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
212 if (seq_printf(s, "[UNREPLIED] "))
213 goto release;
214
215 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
216 l3proto, l4proto))
217 goto release;
218
219 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
220 goto release;
221
222 if (test_bit(IPS_ASSURED_BIT, &ct->status))
223 if (seq_printf(s, "[ASSURED] "))
224 goto release;
225
226#if defined(CONFIG_NF_CONNTRACK_MARK)
227 if (seq_printf(s, "mark=%u ", ct->mark))
228 goto release;
229#endif
230
231 if (ct_show_secctx(s, ct))
232 goto release;
233
234#ifdef CONFIG_NF_CONNTRACK_ZONES
235 if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
236 goto release;
237#endif
238
239 if (ct_show_delta_time(s, ct))
240 goto release;
241
242 if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
243 goto release;
244
245 ret = 0;
246release:
247 nf_ct_put(ct);
248 return ret;
249}
250
251static const struct seq_operations ct_seq_ops = {
252 .start = ct_seq_start,
253 .next = ct_seq_next,
254 .stop = ct_seq_stop,
255 .show = ct_seq_show
256};
257
258static int ct_open(struct inode *inode, struct file *file)
259{
260 return seq_open_net(inode, file, &ct_seq_ops,
261 sizeof(struct ct_iter_state));
262}
263
264static const struct file_operations ct_file_ops = {
265 .owner = THIS_MODULE,
266 .open = ct_open,
267 .read = seq_read,
268 .llseek = seq_lseek,
269 .release = seq_release_net,
270};
271
272static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
273{
274 struct net *net = seq_file_net(seq);
275 int cpu;
276
277 if (*pos == 0)
278 return SEQ_START_TOKEN;
279
280 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
281 if (!cpu_possible(cpu))
282 continue;
283 *pos = cpu + 1;
284 return per_cpu_ptr(net->ct.stat, cpu);
285 }
286
287 return NULL;
288}
289
290static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
291{
292 struct net *net = seq_file_net(seq);
293 int cpu;
294
295 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
296 if (!cpu_possible(cpu))
297 continue;
298 *pos = cpu + 1;
299 return per_cpu_ptr(net->ct.stat, cpu);
300 }
301
302 return NULL;
303}
304
305static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
306{
307}
308
309static int ct_cpu_seq_show(struct seq_file *seq, void *v)
310{
311 struct net *net = seq_file_net(seq);
312 unsigned int nr_conntracks = atomic_read(&net->ct.count);
313 const struct ip_conntrack_stat *st = v;
314
315 if (v == SEQ_START_TOKEN) {
316 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 search_restart\n");
317 return 0;
318 }
319
320 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
321 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
322 nr_conntracks,
323 st->searched,
324 st->found,
325 st->new,
326 st->invalid,
327 st->ignore,
328 st->delete,
329 st->delete_list,
330 st->insert,
331 st->insert_failed,
332 st->drop,
333 st->early_drop,
334 st->error,
335
336 st->expect_new,
337 st->expect_create,
338 st->expect_delete,
339 st->search_restart
340 );
341 return 0;
342}
343
344static const struct seq_operations ct_cpu_seq_ops = {
345 .start = ct_cpu_seq_start,
346 .next = ct_cpu_seq_next,
347 .stop = ct_cpu_seq_stop,
348 .show = ct_cpu_seq_show,
349};
350
351static int ct_cpu_seq_open(struct inode *inode, struct file *file)
352{
353 return seq_open_net(inode, file, &ct_cpu_seq_ops,
354 sizeof(struct seq_net_private));
355}
356
357static const struct file_operations ct_cpu_seq_fops = {
358 .owner = THIS_MODULE,
359 .open = ct_cpu_seq_open,
360 .read = seq_read,
361 .llseek = seq_lseek,
362 .release = seq_release_net,
363};
364
365static int nf_conntrack_standalone_init_proc(struct net *net)
366{
367 struct proc_dir_entry *pde;
368
369 pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
370 if (!pde)
371 goto out_nf_conntrack;
372
373 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
374 &ct_cpu_seq_fops);
375 if (!pde)
376 goto out_stat_nf_conntrack;
377 return 0;
378
379out_stat_nf_conntrack:
380 proc_net_remove(net, "nf_conntrack");
381out_nf_conntrack:
382 return -ENOMEM;
383}
384
385static void nf_conntrack_standalone_fini_proc(struct net *net)
386{
387 remove_proc_entry("nf_conntrack", net->proc_net_stat);
388 proc_net_remove(net, "nf_conntrack");
389}
390#else
391static int nf_conntrack_standalone_init_proc(struct net *net)
392{
393 return 0;
394}
395
396static void nf_conntrack_standalone_fini_proc(struct net *net)
397{
398}
399#endif
400
401
402
403#ifdef CONFIG_SYSCTL
404
405static int log_invalid_proto_min = 0;
406static int log_invalid_proto_max = 255;
407
408static struct ctl_table_header *nf_ct_netfilter_header;
409
410static ctl_table nf_ct_sysctl_table[] = {
411 {
412 .procname = "nf_conntrack_max",
413 .data = &nf_conntrack_max,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec,
417 },
418 {
419 .procname = "nf_conntrack_count",
420 .data = &init_net.ct.count,
421 .maxlen = sizeof(int),
422 .mode = 0444,
423 .proc_handler = proc_dointvec,
424 },
425 {
426 .procname = "nf_conntrack_buckets",
427 .data = &init_net.ct.htable_size,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0444,
430 .proc_handler = proc_dointvec,
431 },
432 {
433 .procname = "nf_conntrack_checksum",
434 .data = &init_net.ct.sysctl_checksum,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec,
438 },
439 {
440 .procname = "nf_conntrack_log_invalid",
441 .data = &init_net.ct.sysctl_log_invalid,
442 .maxlen = sizeof(unsigned int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec_minmax,
445 .extra1 = &log_invalid_proto_min,
446 .extra2 = &log_invalid_proto_max,
447 },
448 {
449 .procname = "nf_conntrack_expect_max",
450 .data = &nf_ct_expect_max,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455 { }
456};
457
458#define NET_NF_CONNTRACK_MAX 2089
459
460static ctl_table nf_ct_netfilter_table[] = {
461 {
462 .procname = "nf_conntrack_max",
463 .data = &nf_conntrack_max,
464 .maxlen = sizeof(int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec,
467 },
468 { }
469};
470
471static struct ctl_path nf_ct_path[] = {
472 { .procname = "net", },
473 { }
474};
475
476static int nf_conntrack_standalone_init_sysctl(struct net *net)
477{
478 struct ctl_table *table;
479
480 if (net_eq(net, &init_net)) {
481 nf_ct_netfilter_header =
482 register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
483 if (!nf_ct_netfilter_header)
484 goto out;
485 }
486
487 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
488 GFP_KERNEL);
489 if (!table)
490 goto out_kmemdup;
491
492 table[1].data = &net->ct.count;
493 table[2].data = &net->ct.htable_size;
494 table[3].data = &net->ct.sysctl_checksum;
495 table[4].data = &net->ct.sysctl_log_invalid;
496
497 net->ct.sysctl_header = register_net_sysctl_table(net,
498 nf_net_netfilter_sysctl_path, table);
499 if (!net->ct.sysctl_header)
500 goto out_unregister_netfilter;
501
502 return 0;
503
504out_unregister_netfilter:
505 kfree(table);
506out_kmemdup:
507 if (net_eq(net, &init_net))
508 unregister_sysctl_table(nf_ct_netfilter_header);
509out:
510 printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n");
511 return -ENOMEM;
512}
513
514static void nf_conntrack_standalone_fini_sysctl(struct net *net)
515{
516 struct ctl_table *table;
517
518 if (net_eq(net, &init_net))
519 unregister_sysctl_table(nf_ct_netfilter_header);
520 table = net->ct.sysctl_header->ctl_table_arg;
521 unregister_net_sysctl_table(net->ct.sysctl_header);
522 kfree(table);
523}
524#else
525static int nf_conntrack_standalone_init_sysctl(struct net *net)
526{
527 return 0;
528}
529
530static void nf_conntrack_standalone_fini_sysctl(struct net *net)
531{
532}
533#endif
534
535static int nf_conntrack_net_init(struct net *net)
536{
537 int ret;
538
539 ret = nf_conntrack_init(net);
540 if (ret < 0)
541 goto out_init;
542 ret = nf_conntrack_standalone_init_proc(net);
543 if (ret < 0)
544 goto out_proc;
545 net->ct.sysctl_checksum = 1;
546 net->ct.sysctl_log_invalid = 0;
547 ret = nf_conntrack_standalone_init_sysctl(net);
548 if (ret < 0)
549 goto out_sysctl;
550 return 0;
551
552out_sysctl:
553 nf_conntrack_standalone_fini_proc(net);
554out_proc:
555 nf_conntrack_cleanup(net);
556out_init:
557 return ret;
558}
559
560static void nf_conntrack_net_exit(struct net *net)
561{
562 nf_conntrack_standalone_fini_sysctl(net);
563 nf_conntrack_standalone_fini_proc(net);
564 nf_conntrack_cleanup(net);
565}
566
567static struct pernet_operations nf_conntrack_net_ops = {
568 .init = nf_conntrack_net_init,
569 .exit = nf_conntrack_net_exit,
570};
571
572static int __init nf_conntrack_standalone_init(void)
573{
574 return register_pernet_subsys(&nf_conntrack_net_ops);
575}
576
577static void __exit nf_conntrack_standalone_fini(void)
578{
579 unregister_pernet_subsys(&nf_conntrack_net_ops);
580}
581
582module_init(nf_conntrack_standalone_init);
583module_exit(nf_conntrack_standalone_fini);
584
585
586
587void need_conntrack(void)
588{
589}
590EXPORT_SYMBOL_GPL(need_conntrack);
591
