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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
36MODULE_LICENSE("GPL");
37
38#ifdef CONFIG_NF_CONNTRACK_PROCFS
39void
40print_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}
47EXPORT_SYMBOL_GPL(print_tuple);
48
49struct 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
57static 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
73static 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
90static 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
100static 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
112static 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
118static 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
125static 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
140static 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
146static 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
168static 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
175static 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
195static inline void
196ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
197{
198}
199#endif
200
201
202static 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
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;
283release:
284 nf_ct_put(ct);
285 return ret;
286}
287
288static 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
295static 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
301static 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
309static 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
327static 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
342static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
343{
344}
345
346static 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
381static 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
388static 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
394static 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
402static 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
423out_stat_nf_conntrack:
424 remove_proc_entry("nf_conntrack", net->proc_net);
425out_nf_conntrack:
426 return -ENOMEM;
427}
428
429static 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
435static int nf_conntrack_standalone_init_proc(struct net *net)
436{
437 return 0;
438}
439
440static void nf_conntrack_standalone_fini_proc(struct net *net)
441{
442}
443#endif
444
445
446
447#ifdef CONFIG_SYSCTL
448
449static int log_invalid_proto_min __read_mostly;
450static int log_invalid_proto_max __read_mostly = 255;
451
452
453static unsigned int nf_conntrack_htable_size_user __read_mostly;
454
455extern unsigned int nf_conntrack_default_on;
456unsigned int nf_conntrack_default_on __read_mostly = 1;
457
458static int
459nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
460 void __user *buffer, size_t *lenp, loff_t *ppos)
461{
462 int ret;
463
464 ret = proc_dointvec(table, write, buffer, lenp, ppos);
465 if (ret < 0 || !write)
466 return ret;
467
468
469 ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
470
471
472 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
473 return ret;
474}
475
476static struct ctl_table_header *nf_ct_netfilter_header;
477
478static struct ctl_table nf_ct_sysctl_table[] = {
479 {
480 .procname = "nf_conntrack_max",
481 .data = &nf_conntrack_max,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 {
487 .procname = "nf_conntrack_count",
488 .data = &init_net.ct.count,
489 .maxlen = sizeof(int),
490 .mode = 0444,
491 .proc_handler = proc_dointvec,
492 },
493 {
494 .procname = "nf_conntrack_buckets",
495 .data = &nf_conntrack_htable_size_user,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
498 .proc_handler = nf_conntrack_hash_sysctl,
499 },
500 {
501 .procname = "nf_conntrack_checksum",
502 .data = &init_net.ct.sysctl_checksum,
503 .maxlen = sizeof(unsigned int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 {
508 .procname = "nf_conntrack_log_invalid",
509 .data = &init_net.ct.sysctl_log_invalid,
510 .maxlen = sizeof(unsigned int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec_minmax,
513 .extra1 = &log_invalid_proto_min,
514 .extra2 = &log_invalid_proto_max,
515 },
516 {
517 .procname = "nf_conntrack_expect_max",
518 .data = &nf_ct_expect_max,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec,
522 },
523 {
524 .procname = "nf_conntrack_default_on",
525 .data = &nf_conntrack_default_on,
526 .maxlen = sizeof(unsigned int),
527 .mode = 0644,
528 .proc_handler = proc_dointvec,
529 },
530 { }
531};
532
533static struct ctl_table nf_ct_netfilter_table[] = {
534 {
535 .procname = "nf_conntrack_max",
536 .data = &nf_conntrack_max,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 { }
542};
543
544static int nf_conntrack_standalone_init_sysctl(struct net *net)
545{
546 struct ctl_table *table;
547
548 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
549 GFP_KERNEL);
550 if (!table)
551 goto out_kmemdup;
552
553 table[1].data = &net->ct.count;
554 table[3].data = &net->ct.sysctl_checksum;
555 table[4].data = &net->ct.sysctl_log_invalid;
556
557
558 if (net->user_ns != &init_user_ns)
559 table[0].procname = NULL;
560
561 if (!net_eq(&init_net, net))
562 table[2].mode = 0444;
563
564 net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
565 if (!net->ct.sysctl_header)
566 goto out_unregister_netfilter;
567
568 return 0;
569
570out_unregister_netfilter:
571 kfree(table);
572out_kmemdup:
573 return -ENOMEM;
574}
575
576static void nf_conntrack_standalone_fini_sysctl(struct net *net)
577{
578 struct ctl_table *table;
579
580 table = net->ct.sysctl_header->ctl_table_arg;
581 unregister_net_sysctl_table(net->ct.sysctl_header);
582 kfree(table);
583}
584#else
585static int nf_conntrack_standalone_init_sysctl(struct net *net)
586{
587 return 0;
588}
589
590static void nf_conntrack_standalone_fini_sysctl(struct net *net)
591{
592}
593#endif
594
595static int nf_conntrack_pernet_init(struct net *net)
596{
597 int ret;
598
599 ret = nf_conntrack_init_net(net);
600 if (ret < 0)
601 goto out_init;
602
603 ret = nf_conntrack_standalone_init_proc(net);
604 if (ret < 0)
605 goto out_proc;
606
607 net->ct.sysctl_checksum = 1;
608 net->ct.sysctl_log_invalid = 0;
609 ret = nf_conntrack_standalone_init_sysctl(net);
610 if (ret < 0)
611 goto out_sysctl;
612
613 return 0;
614
615out_sysctl:
616 nf_conntrack_standalone_fini_proc(net);
617out_proc:
618 nf_conntrack_cleanup_net(net);
619out_init:
620 return ret;
621}
622
623static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
624{
625 struct net *net;
626
627 list_for_each_entry(net, net_exit_list, exit_list) {
628 nf_conntrack_standalone_fini_sysctl(net);
629 nf_conntrack_standalone_fini_proc(net);
630 }
631 nf_conntrack_cleanup_net_list(net_exit_list);
632}
633
634static struct pernet_operations nf_conntrack_net_ops = {
635 .init = nf_conntrack_pernet_init,
636 .exit_batch = nf_conntrack_pernet_exit,
637};
638
639static int __init nf_conntrack_standalone_init(void)
640{
641 int ret = nf_conntrack_init_start();
642 if (ret < 0)
643 goto out_start;
644
645 BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
646 BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
647
648#ifdef CONFIG_SYSCTL
649 nf_ct_netfilter_header =
650 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
651 if (!nf_ct_netfilter_header) {
652 pr_err("nf_conntrack: can't register to sysctl.\n");
653 ret = -ENOMEM;
654 goto out_sysctl;
655 }
656
657 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
658#endif
659
660 ret = register_pernet_subsys(&nf_conntrack_net_ops);
661 if (ret < 0)
662 goto out_pernet;
663
664 nf_conntrack_init_end();
665 return 0;
666
667out_pernet:
668#ifdef CONFIG_SYSCTL
669 unregister_net_sysctl_table(nf_ct_netfilter_header);
670out_sysctl:
671#endif
672 nf_conntrack_cleanup_end();
673out_start:
674 return ret;
675}
676
677static void __exit nf_conntrack_standalone_fini(void)
678{
679 nf_conntrack_cleanup_start();
680 unregister_pernet_subsys(&nf_conntrack_net_ops);
681#ifdef CONFIG_SYSCTL
682 unregister_net_sysctl_table(nf_ct_netfilter_header);
683#endif
684 nf_conntrack_cleanup_end();
685}
686
687module_init(nf_conntrack_standalone_init);
688module_exit(nf_conntrack_standalone_fini);
689
690
691
692void need_conntrack(void)
693{
694}
695EXPORT_SYMBOL_GPL(need_conntrack);
696
