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 switch (l3proto->l3proto) {
46 seq_printf(s, "src=%pI4 dst=%pI4 ",
47 &tuple->src.u3.ip, &tuple->dst.u3.ip);
50 seq_printf(s, "src=%pI6 dst=%pI6 ",
51 tuple->src.u3.ip6, tuple->dst.u3.ip6);
57 switch (l4proto->l4proto) {
59 seq_printf(s, "type=%u code=%u id=%u ",
60 tuple->dst.u.icmp.type,
61 tuple->dst.u.icmp.code,
62 ntohs(tuple->src.u.icmp.id));
65 seq_printf(s, "sport=%hu dport=%hu ",
66 ntohs(tuple->src.u.tcp.port),
67 ntohs(tuple->dst.u.tcp.port));
69 case IPPROTO_UDPLITE: /* fallthrough */
71 seq_printf(s, "sport=%hu dport=%hu ",
72 ntohs(tuple->src.u.udp.port),
73 ntohs(tuple->dst.u.udp.port));
77 seq_printf(s, "sport=%hu dport=%hu ",
78 ntohs(tuple->src.u.dccp.port),
79 ntohs(tuple->dst.u.dccp.port));
82 seq_printf(s, "sport=%hu dport=%hu ",
83 ntohs(tuple->src.u.sctp.port),
84 ntohs(tuple->dst.u.sctp.port));
87 seq_printf(s, "type=%u code=%u id=%u ",
88 tuple->dst.u.icmp.type,
89 tuple->dst.u.icmp.code,
90 ntohs(tuple->src.u.icmp.id));
93 seq_printf(s, "srckey=0x%x dstkey=0x%x ",
94 ntohs(tuple->src.u.gre.key),
95 ntohs(tuple->dst.u.gre.key));
101 EXPORT_SYMBOL_GPL(print_tuple);
103 struct ct_iter_state {
104 struct seq_net_private p;
105 struct hlist_nulls_head *hash;
106 unsigned int htable_size;
111 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
113 struct ct_iter_state *st = seq->private;
114 struct hlist_nulls_node *n;
117 st->bucket < st->htable_size;
120 hlist_nulls_first_rcu(&st->hash[st->bucket]));
127 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
128 struct hlist_nulls_node *head)
130 struct ct_iter_state *st = seq->private;
132 head = rcu_dereference(hlist_nulls_next_rcu(head));
133 while (is_a_nulls(head)) {
134 if (likely(get_nulls_value(head) == st->bucket)) {
135 if (++st->bucket >= st->htable_size)
138 head = rcu_dereference(
139 hlist_nulls_first_rcu(&st->hash[st->bucket]));
144 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
146 struct hlist_nulls_node *head = ct_get_first(seq);
149 while (pos && (head = ct_get_next(seq, head)))
151 return pos ? NULL : head;
154 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
157 struct ct_iter_state *st = seq->private;
159 st->time_now = ktime_get_real_ns();
162 nf_conntrack_get_ht(&st->hash, &st->htable_size);
163 return ct_get_idx(seq, *pos);
166 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
169 return ct_get_next(s, v);
172 static void ct_seq_stop(struct seq_file *s, void *v)
178 #ifdef CONFIG_NF_CONNTRACK_SECMARK
179 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
185 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
189 seq_printf(s, "secctx=%s ", secctx);
191 security_release_secctx(secctx, len);
194 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
199 #ifdef CONFIG_NF_CONNTRACK_ZONES
200 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
203 const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
205 if (zone->dir != dir)
208 case NF_CT_DEFAULT_ZONE_DIR:
209 seq_printf(s, "zone=%u ", zone->id);
211 case NF_CT_ZONE_DIR_ORIG:
212 seq_printf(s, "zone-orig=%u ", zone->id);
214 case NF_CT_ZONE_DIR_REPL:
215 seq_printf(s, "zone-reply=%u ", zone->id);
222 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
228 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
229 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
231 struct ct_iter_state *st = s->private;
232 struct nf_conn_tstamp *tstamp;
235 tstamp = nf_conn_tstamp_find(ct);
237 delta_time = st->time_now - tstamp->start;
239 delta_time = div_s64(delta_time, NSEC_PER_SEC);
243 seq_printf(s, "delta-time=%llu ",
244 (unsigned long long)delta_time);
250 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
255 static const char* l3proto_name(u16 proto)
258 case AF_INET: return "ipv4";
259 case AF_INET6: return "ipv6";
265 static const char* l4proto_name(u16 proto)
268 case IPPROTO_ICMP: return "icmp";
269 case IPPROTO_TCP: return "tcp";
270 case IPPROTO_UDP: return "udp";
271 case IPPROTO_DCCP: return "dccp";
272 case IPPROTO_GRE: return "gre";
273 case IPPROTO_SCTP: return "sctp";
274 case IPPROTO_UDPLITE: return "udplite";
275 case IPPROTO_ICMPV6: return "icmpv6";
281 /* return 0 on success, 1 in case of error */
282 static int ct_seq_show(struct seq_file *s, void *v)
284 struct nf_conntrack_tuple_hash *hash = v;
285 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
286 const struct nf_conntrack_l3proto *l3proto;
287 const struct nf_conntrack_l4proto *l4proto;
288 struct net *net = seq_file_net(s);
292 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
295 if (nf_ct_should_gc(ct)) {
300 /* we only want to print DIR_ORIGINAL */
301 if (NF_CT_DIRECTION(hash))
304 if (!net_eq(nf_ct_net(ct), net))
307 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
309 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
313 seq_printf(s, "%-8s %u %-8s %u %ld ",
314 l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
315 l4proto_name(l4proto->l4proto), nf_ct_protonum(ct),
316 nf_ct_expires(ct) / HZ);
318 if (l4proto->print_conntrack)
319 l4proto->print_conntrack(s, ct);
321 print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
324 ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
326 if (seq_has_overflowed(s))
329 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
332 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
333 seq_puts(s, "[UNREPLIED] ");
335 print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
338 ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
340 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
343 if (test_bit(IPS_ASSURED_BIT, &ct->status))
344 seq_puts(s, "[ASSURED] ");
346 if (seq_has_overflowed(s))
349 #if defined(CONFIG_NF_CONNTRACK_MARK)
350 seq_printf(s, "mark=%u ", ct->mark);
353 ct_show_secctx(s, ct);
354 ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
355 ct_show_delta_time(s, ct);
357 seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
359 if (seq_has_overflowed(s))
368 static const struct seq_operations ct_seq_ops = {
369 .start = ct_seq_start,
375 static int ct_open(struct inode *inode, struct file *file)
377 return seq_open_net(inode, file, &ct_seq_ops,
378 sizeof(struct ct_iter_state));
381 static const struct file_operations ct_file_ops = {
382 .owner = THIS_MODULE,
386 .release = seq_release_net,
389 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
391 struct net *net = seq_file_net(seq);
395 return SEQ_START_TOKEN;
397 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
398 if (!cpu_possible(cpu))
401 return per_cpu_ptr(net->ct.stat, cpu);
407 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
409 struct net *net = seq_file_net(seq);
412 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
413 if (!cpu_possible(cpu))
416 return per_cpu_ptr(net->ct.stat, cpu);
422 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
426 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
428 struct net *net = seq_file_net(seq);
429 unsigned int nr_conntracks = atomic_read(&net->ct.count);
430 const struct ip_conntrack_stat *st = v;
432 if (v == SEQ_START_TOKEN) {
433 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");
437 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
438 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
461 static const struct seq_operations ct_cpu_seq_ops = {
462 .start = ct_cpu_seq_start,
463 .next = ct_cpu_seq_next,
464 .stop = ct_cpu_seq_stop,
465 .show = ct_cpu_seq_show,
468 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
470 return seq_open_net(inode, file, &ct_cpu_seq_ops,
471 sizeof(struct seq_net_private));
474 static const struct file_operations ct_cpu_seq_fops = {
475 .owner = THIS_MODULE,
476 .open = ct_cpu_seq_open,
479 .release = seq_release_net,
482 static int nf_conntrack_standalone_init_proc(struct net *net)
484 struct proc_dir_entry *pde;
488 pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
490 goto out_nf_conntrack;
492 root_uid = make_kuid(net->user_ns, 0);
493 root_gid = make_kgid(net->user_ns, 0);
494 if (uid_valid(root_uid) && gid_valid(root_gid))
495 proc_set_user(pde, root_uid, root_gid);
497 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
500 goto out_stat_nf_conntrack;
503 out_stat_nf_conntrack:
504 remove_proc_entry("nf_conntrack", net->proc_net);
509 static void nf_conntrack_standalone_fini_proc(struct net *net)
511 remove_proc_entry("nf_conntrack", net->proc_net_stat);
512 remove_proc_entry("nf_conntrack", net->proc_net);
515 static int nf_conntrack_standalone_init_proc(struct net *net)
520 static void nf_conntrack_standalone_fini_proc(struct net *net)
523 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
528 /* Log invalid packets of a given protocol */
529 static int log_invalid_proto_min __read_mostly;
530 static int log_invalid_proto_max __read_mostly = 255;
532 /* size the user *wants to set */
533 static unsigned int nf_conntrack_htable_size_user __read_mostly;
536 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
537 void __user *buffer, size_t *lenp, loff_t *ppos)
541 /* module_param hashsize could have changed value */
542 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
544 ret = proc_dointvec(table, write, buffer, lenp, ppos);
545 if (ret < 0 || !write)
548 /* update ret, we might not be able to satisfy request */
549 ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
551 /* update it to the actual value used by conntrack */
552 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
556 static struct ctl_table_header *nf_ct_netfilter_header;
558 static struct ctl_table nf_ct_sysctl_table[] = {
560 .procname = "nf_conntrack_max",
561 .data = &nf_conntrack_max,
562 .maxlen = sizeof(int),
564 .proc_handler = proc_dointvec,
567 .procname = "nf_conntrack_count",
568 .data = &init_net.ct.count,
569 .maxlen = sizeof(int),
571 .proc_handler = proc_dointvec,
574 .procname = "nf_conntrack_buckets",
575 .data = &nf_conntrack_htable_size_user,
576 .maxlen = sizeof(unsigned int),
578 .proc_handler = nf_conntrack_hash_sysctl,
581 .procname = "nf_conntrack_checksum",
582 .data = &init_net.ct.sysctl_checksum,
583 .maxlen = sizeof(unsigned int),
585 .proc_handler = proc_dointvec,
588 .procname = "nf_conntrack_log_invalid",
589 .data = &init_net.ct.sysctl_log_invalid,
590 .maxlen = sizeof(unsigned int),
592 .proc_handler = proc_dointvec_minmax,
593 .extra1 = &log_invalid_proto_min,
594 .extra2 = &log_invalid_proto_max,
597 .procname = "nf_conntrack_expect_max",
598 .data = &nf_ct_expect_max,
599 .maxlen = sizeof(int),
601 .proc_handler = proc_dointvec,
606 static struct ctl_table nf_ct_netfilter_table[] = {
608 .procname = "nf_conntrack_max",
609 .data = &nf_conntrack_max,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec,
617 static int nf_conntrack_standalone_init_sysctl(struct net *net)
619 struct ctl_table *table;
621 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
626 table[1].data = &net->ct.count;
627 table[3].data = &net->ct.sysctl_checksum;
628 table[4].data = &net->ct.sysctl_log_invalid;
630 /* Don't export sysctls to unprivileged users */
631 if (net->user_ns != &init_user_ns)
632 table[0].procname = NULL;
634 if (!net_eq(&init_net, net)) {
635 table[0].mode = 0444;
636 table[2].mode = 0444;
637 table[5].mode = 0444;
640 net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
641 if (!net->ct.sysctl_header)
642 goto out_unregister_netfilter;
646 out_unregister_netfilter:
652 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
654 struct ctl_table *table;
656 table = net->ct.sysctl_header->ctl_table_arg;
657 unregister_net_sysctl_table(net->ct.sysctl_header);
661 static int nf_conntrack_standalone_init_sysctl(struct net *net)
666 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
669 #endif /* CONFIG_SYSCTL */
671 static int nf_conntrack_pernet_init(struct net *net)
675 ret = nf_conntrack_init_net(net);
679 ret = nf_conntrack_standalone_init_proc(net);
683 net->ct.sysctl_checksum = 1;
684 net->ct.sysctl_log_invalid = 0;
685 ret = nf_conntrack_standalone_init_sysctl(net);
692 nf_conntrack_standalone_fini_proc(net);
694 nf_conntrack_cleanup_net(net);
699 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
703 list_for_each_entry(net, net_exit_list, exit_list) {
704 nf_conntrack_standalone_fini_sysctl(net);
705 nf_conntrack_standalone_fini_proc(net);
707 nf_conntrack_cleanup_net_list(net_exit_list);
710 static struct pernet_operations nf_conntrack_net_ops = {
711 .init = nf_conntrack_pernet_init,
712 .exit_batch = nf_conntrack_pernet_exit,
715 static int __init nf_conntrack_standalone_init(void)
717 int ret = nf_conntrack_init_start();
721 BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
722 BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
725 nf_ct_netfilter_header =
726 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
727 if (!nf_ct_netfilter_header) {
728 pr_err("nf_conntrack: can't register to sysctl.\n");
733 nf_conntrack_htable_size_user = nf_conntrack_htable_size;
736 ret = register_pernet_subsys(&nf_conntrack_net_ops);
740 nf_conntrack_init_end();
745 unregister_net_sysctl_table(nf_ct_netfilter_header);
748 nf_conntrack_cleanup_end();
753 static void __exit nf_conntrack_standalone_fini(void)
755 nf_conntrack_cleanup_start();
756 unregister_pernet_subsys(&nf_conntrack_net_ops);
758 unregister_net_sysctl_table(nf_ct_netfilter_header);
760 nf_conntrack_cleanup_end();
763 module_init(nf_conntrack_standalone_init);
764 module_exit(nf_conntrack_standalone_fini);
766 /* Some modules need us, but don't depend directly on any symbol.
767 They should call this. */
768 void need_conntrack(void)
771 EXPORT_SYMBOL_GPL(need_conntrack);