1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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.
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>
19 #include <linux/sysctl.h>
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>
30 MODULE_LICENSE("GPL");
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)
38 return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
40 EXPORT_SYMBOL_GPL(print_tuple);
42 struct ct_iter_state {
43 struct seq_net_private p;
47 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
49 struct net *net = seq_file_net(seq);
50 struct ct_iter_state *st = seq->private;
51 struct hlist_nulls_node *n;
54 st->bucket < nf_conntrack_htable_size;
56 n = rcu_dereference(net->ct.hash[st->bucket].first);
63 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
64 struct hlist_nulls_node *head)
66 struct net *net = seq_file_net(seq);
67 struct ct_iter_state *st = seq->private;
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)
75 head = rcu_dereference(net->ct.hash[st->bucket].first);
80 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
82 struct hlist_nulls_node *head = ct_get_first(seq);
85 while (pos && (head = ct_get_next(seq, head)))
87 return pos ? NULL : head;
90 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
94 return ct_get_idx(seq, *pos);
97 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
100 return ct_get_next(s, v);
103 static void ct_seq_stop(struct seq_file *s, void *v)
109 /* return 0 on success, 1 in case of error */
110 static int ct_seq_show(struct seq_file *s, void *v)
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;
119 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
122 /* we only want to print DIR_ORIGINAL */
123 if (NF_CT_DIRECTION(hash))
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);
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)
139 if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
142 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
146 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
149 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
150 if (seq_printf(s, "[UNREPLIED] "))
153 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
157 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
160 if (test_bit(IPS_ASSURED_BIT, &ct->status))
161 if (seq_printf(s, "[ASSURED] "))
164 #if defined(CONFIG_NF_CONNTRACK_MARK)
165 if (seq_printf(s, "mark=%u ", ct->mark))
169 #ifdef CONFIG_NF_CONNTRACK_SECMARK
170 if (seq_printf(s, "secmark=%u ", ct->secmark))
174 if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
183 static const struct seq_operations ct_seq_ops = {
184 .start = ct_seq_start,
190 static int ct_open(struct inode *inode, struct file *file)
192 return seq_open_net(inode, file, &ct_seq_ops,
193 sizeof(struct ct_iter_state));
196 static const struct file_operations ct_file_ops = {
197 .owner = THIS_MODULE,
201 .release = seq_release_net,
204 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
206 struct net *net = seq_file_net(seq);
210 return SEQ_START_TOKEN;
212 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
213 if (!cpu_possible(cpu))
216 return per_cpu_ptr(net->ct.stat, cpu);
222 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
224 struct net *net = seq_file_net(seq);
227 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
228 if (!cpu_possible(cpu))
231 return per_cpu_ptr(net->ct.stat, cpu);
237 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
241 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
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;
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");
252 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
253 "%08x %08x %08x %08x %08x %08x %08x %08x \n",
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,
282 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
284 return seq_open_net(inode, file, &ct_cpu_seq_ops,
285 sizeof(struct seq_net_private));
288 static const struct file_operations ct_cpu_seq_fops = {
289 .owner = THIS_MODULE,
290 .open = ct_cpu_seq_open,
293 .release = seq_release_net,
296 static int nf_conntrack_standalone_init_proc(struct net *net)
298 struct proc_dir_entry *pde;
300 pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
302 goto out_nf_conntrack;
304 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
307 goto out_stat_nf_conntrack;
310 out_stat_nf_conntrack:
311 proc_net_remove(net, "nf_conntrack");
316 static void nf_conntrack_standalone_fini_proc(struct net *net)
318 remove_proc_entry("nf_conntrack", net->proc_net_stat);
319 proc_net_remove(net, "nf_conntrack");
322 static int nf_conntrack_standalone_init_proc(struct net *net)
327 static void nf_conntrack_standalone_fini_proc(struct net *net)
330 #endif /* CONFIG_PROC_FS */
335 /* Log invalid packets of a given protocol */
336 static int log_invalid_proto_min = 0;
337 static int log_invalid_proto_max = 255;
339 static struct ctl_table_header *nf_ct_netfilter_header;
341 static ctl_table nf_ct_sysctl_table[] = {
343 .ctl_name = NET_NF_CONNTRACK_MAX,
344 .procname = "nf_conntrack_max",
345 .data = &nf_conntrack_max,
346 .maxlen = sizeof(int),
348 .proc_handler = proc_dointvec,
351 .ctl_name = NET_NF_CONNTRACK_COUNT,
352 .procname = "nf_conntrack_count",
353 .data = &init_net.ct.count,
354 .maxlen = sizeof(int),
356 .proc_handler = proc_dointvec,
359 .ctl_name = NET_NF_CONNTRACK_BUCKETS,
360 .procname = "nf_conntrack_buckets",
361 .data = &nf_conntrack_htable_size,
362 .maxlen = sizeof(unsigned int),
364 .proc_handler = proc_dointvec,
367 .ctl_name = NET_NF_CONNTRACK_CHECKSUM,
368 .procname = "nf_conntrack_checksum",
369 .data = &init_net.ct.sysctl_checksum,
370 .maxlen = sizeof(unsigned int),
372 .proc_handler = proc_dointvec,
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),
380 .proc_handler = proc_dointvec_minmax,
381 .strategy = sysctl_intvec,
382 .extra1 = &log_invalid_proto_min,
383 .extra2 = &log_invalid_proto_max,
386 .ctl_name = CTL_UNNUMBERED,
387 .procname = "nf_conntrack_expect_max",
388 .data = &nf_ct_expect_max,
389 .maxlen = sizeof(int),
391 .proc_handler = proc_dointvec,
396 #define NET_NF_CONNTRACK_MAX 2089
398 static ctl_table nf_ct_netfilter_table[] = {
400 .ctl_name = NET_NF_CONNTRACK_MAX,
401 .procname = "nf_conntrack_max",
402 .data = &nf_conntrack_max,
403 .maxlen = sizeof(int),
405 .proc_handler = proc_dointvec,
410 static struct ctl_path nf_ct_path[] = {
411 { .procname = "net", .ctl_name = CTL_NET, },
415 static int nf_conntrack_standalone_init_sysctl(struct net *net)
417 struct ctl_table *table;
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)
426 table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
431 table[1].data = &net->ct.count;
432 table[3].data = &net->ct.sysctl_checksum;
433 table[4].data = &net->ct.sysctl_log_invalid;
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;
442 out_unregister_netfilter:
445 if (net_eq(net, &init_net))
446 unregister_sysctl_table(nf_ct_netfilter_header);
448 printk("nf_conntrack: can't register to sysctl.\n");
452 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
454 struct ctl_table *table;
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);
463 static int nf_conntrack_standalone_init_sysctl(struct net *net)
468 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
471 #endif /* CONFIG_SYSCTL */
473 static int nf_conntrack_net_init(struct net *net)
477 ret = nf_conntrack_init(net);
480 ret = nf_conntrack_standalone_init_proc(net);
483 net->ct.sysctl_checksum = 1;
484 net->ct.sysctl_log_invalid = 0;
485 ret = nf_conntrack_standalone_init_sysctl(net);
491 nf_conntrack_standalone_fini_proc(net);
493 nf_conntrack_cleanup(net);
498 static void nf_conntrack_net_exit(struct net *net)
500 nf_conntrack_standalone_fini_sysctl(net);
501 nf_conntrack_standalone_fini_proc(net);
502 nf_conntrack_cleanup(net);
505 static struct pernet_operations nf_conntrack_net_ops = {
506 .init = nf_conntrack_net_init,
507 .exit = nf_conntrack_net_exit,
510 static int __init nf_conntrack_standalone_init(void)
512 return register_pernet_subsys(&nf_conntrack_net_ops);
515 static void __exit nf_conntrack_standalone_fini(void)
517 unregister_pernet_subsys(&nf_conntrack_net_ops);
520 module_init(nf_conntrack_standalone_init);
521 module_exit(nf_conntrack_standalone_fini);
523 /* Some modules need us, but don't depend directly on any symbol.
524 They should call this. */
525 void need_conntrack(void)
528 EXPORT_SYMBOL_GPL(need_conntrack);