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>
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.
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>
22 #include <linux/sysctl.h>
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>
36 MODULE_LICENSE("GPL");
38 #ifdef CONFIG_NF_CONNTRACK_PROCFS
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)
44 l3proto->print_tuple(s, tuple);
45 l4proto->print_tuple(s, tuple);
47 EXPORT_SYMBOL_GPL(print_tuple);
49 struct ct_iter_state {
50 struct seq_net_private p;
51 struct hlist_nulls_head *hash;
52 unsigned int htable_size;
57 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
59 struct ct_iter_state *st = seq->private;
60 struct hlist_nulls_node *n;
63 st->bucket < st->htable_size;
66 hlist_nulls_first_rcu(&st->hash[st->bucket]));
73 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
74 struct hlist_nulls_node *head)
76 struct ct_iter_state *st = seq->private;
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)
84 head = rcu_dereference(
85 hlist_nulls_first_rcu(&st->hash[st->bucket]));
90 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
92 struct hlist_nulls_node *head = ct_get_first(seq);
95 while (pos && (head = ct_get_next(seq, head)))
97 return pos ? NULL : head;
100 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
103 struct ct_iter_state *st = seq->private;
105 st->time_now = ktime_get_real_ns();
108 nf_conntrack_get_ht(&st->hash, &st->htable_size);
109 return ct_get_idx(seq, *pos);
112 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
115 return ct_get_next(s, v);
118 static void ct_seq_stop(struct seq_file *s, void *v)
124 #ifdef CONFIG_NF_CONNTRACK_SECMARK
125 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
131 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
135 seq_printf(s, "secctx=%s ", secctx);
137 security_release_secctx(secctx, len);
140 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
145 #ifdef CONFIG_NF_CONNTRACK_ZONES
146 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
149 const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
151 if (zone->dir != dir)
154 case NF_CT_DEFAULT_ZONE_DIR:
155 seq_printf(s, "zone=%u ", zone->id);
157 case NF_CT_ZONE_DIR_ORIG:
158 seq_printf(s, "zone-orig=%u ", zone->id);
160 case NF_CT_ZONE_DIR_REPL:
161 seq_printf(s, "zone-reply=%u ", zone->id);
168 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
174 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
175 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
177 struct ct_iter_state *st = s->private;
178 struct nf_conn_tstamp *tstamp;
181 tstamp = nf_conn_tstamp_find(ct);
183 delta_time = st->time_now - tstamp->start;
185 delta_time = div_s64(delta_time, NSEC_PER_SEC);
189 seq_printf(s, "delta-time=%llu ",
190 (unsigned long long)delta_time);
196 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
201 /* return 0 on success, 1 in case of error */
202 static int ct_seq_show(struct seq_file *s, void *v)
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);
212 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
215 if (nf_ct_should_gc(ct)) {
220 /* we only want to print DIR_ORIGINAL */
221 if (NF_CT_DIRECTION(hash))
224 if (!net_eq(nf_ct_net(ct), net))
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);
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);
238 if (l4proto->print_conntrack)
239 l4proto->print_conntrack(s, ct);
241 print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
244 ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
246 if (seq_has_overflowed(s))
249 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
252 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
253 seq_printf(s, "[UNREPLIED] ");
255 print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
258 ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
260 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
263 if (test_bit(IPS_ASSURED_BIT, &ct->status))
264 seq_printf(s, "[ASSURED] ");
266 if (seq_has_overflowed(s))
269 #if defined(CONFIG_NF_CONNTRACK_MARK)
270 seq_printf(s, "mark=%u ", ct->mark);
273 ct_show_secctx(s, ct);
274 ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
275 ct_show_delta_time(s, ct);
277 seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
279 if (seq_has_overflowed(s))
288 static const struct seq_operations ct_seq_ops = {
289 .start = ct_seq_start,
295 static int ct_open(struct inode *inode, struct file *file)
297 return seq_open_net(inode, file, &ct_seq_ops,
298 sizeof(struct ct_iter_state));
301 static const struct file_operations ct_file_ops = {
302 .owner = THIS_MODULE,
306 .release = seq_release_net,
309 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
311 struct net *net = seq_file_net(seq);
315 return SEQ_START_TOKEN;
317 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
318 if (!cpu_possible(cpu))
321 return per_cpu_ptr(net->ct.stat, cpu);
327 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
329 struct net *net = seq_file_net(seq);
332 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
333 if (!cpu_possible(cpu))
336 return per_cpu_ptr(net->ct.stat, cpu);
342 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
346 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
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;
352 if (v == SEQ_START_TOKEN) {
353 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");
357 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
358 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
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,
388 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
390 return seq_open_net(inode, file, &ct_cpu_seq_ops,
391 sizeof(struct seq_net_private));
394 static const struct file_operations ct_cpu_seq_fops = {
395 .owner = THIS_MODULE,
396 .open = ct_cpu_seq_open,
399 .release = seq_release_net,
402 static int nf_conntrack_standalone_init_proc(struct net *net)
404 struct proc_dir_entry *pde;
408 pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
410 goto out_nf_conntrack;
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);
417 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
420 goto out_stat_nf_conntrack;
423 out_stat_nf_conntrack:
424 remove_proc_entry("nf_conntrack", net->proc_net);
429 static void nf_conntrack_standalone_fini_proc(struct net *net)
431 remove_proc_entry("nf_conntrack", net->proc_net_stat);
432 remove_proc_entry("nf_conntrack", net->proc_net);
435 static int nf_conntrack_standalone_init_proc(struct net *net)
440 static void nf_conntrack_standalone_fini_proc(struct net *net)
443 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
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;
452 /* size the user *wants to set */
453 static unsigned int nf_conntrack_htable_size_user __read_mostly;
455 extern unsigned int nf_conntrack_default_on;
456 unsigned int nf_conntrack_default_on __read_mostly = 1;
459 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
460 void __user *buffer, size_t *lenp, loff_t *ppos)
464 ret = proc_dointvec(table, write, buffer, lenp, ppos);
465 if (ret < 0 || !write)
468 /* update ret, we might not be able to satisfy request */
469 ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
471 /* update it to the actual value used by conntrack */
472 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
476 static struct ctl_table_header *nf_ct_netfilter_header;
478 static struct ctl_table nf_ct_sysctl_table[] = {
480 .procname = "nf_conntrack_max",
481 .data = &nf_conntrack_max,
482 .maxlen = sizeof(int),
484 .proc_handler = proc_dointvec,
487 .procname = "nf_conntrack_count",
488 .data = &init_net.ct.count,
489 .maxlen = sizeof(int),
491 .proc_handler = proc_dointvec,
494 .procname = "nf_conntrack_buckets",
495 .data = &nf_conntrack_htable_size_user,
496 .maxlen = sizeof(unsigned int),
498 .proc_handler = nf_conntrack_hash_sysctl,
501 .procname = "nf_conntrack_checksum",
502 .data = &init_net.ct.sysctl_checksum,
503 .maxlen = sizeof(unsigned int),
505 .proc_handler = proc_dointvec,
508 .procname = "nf_conntrack_log_invalid",
509 .data = &init_net.ct.sysctl_log_invalid,
510 .maxlen = sizeof(unsigned int),
512 .proc_handler = proc_dointvec_minmax,
513 .extra1 = &log_invalid_proto_min,
514 .extra2 = &log_invalid_proto_max,
517 .procname = "nf_conntrack_expect_max",
518 .data = &nf_ct_expect_max,
519 .maxlen = sizeof(int),
521 .proc_handler = proc_dointvec,
524 .procname = "nf_conntrack_default_on",
525 .data = &nf_conntrack_default_on,
526 .maxlen = sizeof(unsigned int),
528 .proc_handler = proc_dointvec,
533 static struct ctl_table nf_ct_netfilter_table[] = {
535 .procname = "nf_conntrack_max",
536 .data = &nf_conntrack_max,
537 .maxlen = sizeof(int),
539 .proc_handler = proc_dointvec,
544 static int nf_conntrack_standalone_init_sysctl(struct net *net)
546 struct ctl_table *table;
548 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
553 table[1].data = &net->ct.count;
554 table[3].data = &net->ct.sysctl_checksum;
555 table[4].data = &net->ct.sysctl_log_invalid;
557 /* Don't export sysctls to unprivileged users */
558 if (net->user_ns != &init_user_ns)
559 table[0].procname = NULL;
561 if (!net_eq(&init_net, net))
562 table[2].mode = 0444;
564 net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
565 if (!net->ct.sysctl_header)
566 goto out_unregister_netfilter;
570 out_unregister_netfilter:
576 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
578 struct ctl_table *table;
580 table = net->ct.sysctl_header->ctl_table_arg;
581 unregister_net_sysctl_table(net->ct.sysctl_header);
585 static int nf_conntrack_standalone_init_sysctl(struct net *net)
590 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
593 #endif /* CONFIG_SYSCTL */
595 static int nf_conntrack_pernet_init(struct net *net)
599 ret = nf_conntrack_init_net(net);
603 ret = nf_conntrack_standalone_init_proc(net);
607 net->ct.sysctl_checksum = 1;
608 net->ct.sysctl_log_invalid = 0;
609 ret = nf_conntrack_standalone_init_sysctl(net);
616 nf_conntrack_standalone_fini_proc(net);
618 nf_conntrack_cleanup_net(net);
623 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
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);
631 nf_conntrack_cleanup_net_list(net_exit_list);
634 static struct pernet_operations nf_conntrack_net_ops = {
635 .init = nf_conntrack_pernet_init,
636 .exit_batch = nf_conntrack_pernet_exit,
639 static int __init nf_conntrack_standalone_init(void)
641 int ret = nf_conntrack_init_start();
645 BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
646 BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
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");
657 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
660 ret = register_pernet_subsys(&nf_conntrack_net_ops);
664 nf_conntrack_init_end();
669 unregister_net_sysctl_table(nf_ct_netfilter_header);
672 nf_conntrack_cleanup_end();
677 static void __exit nf_conntrack_standalone_fini(void)
679 nf_conntrack_cleanup_start();
680 unregister_pernet_subsys(&nf_conntrack_net_ops);
682 unregister_net_sysctl_table(nf_ct_netfilter_header);
684 nf_conntrack_cleanup_end();
687 module_init(nf_conntrack_standalone_init);
688 module_exit(nf_conntrack_standalone_fini);
690 /* Some modules need us, but don't depend directly on any symbol.
691 They should call this. */
692 void need_conntrack(void)
695 EXPORT_SYMBOL_GPL(need_conntrack);