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/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 <net/net_namespace.h>
20 #include <linux/sysctl.h>
23 #include <net/netfilter/nf_conntrack.h>
24 #include <net/netfilter/nf_conntrack_core.h>
25 #include <net/netfilter/nf_conntrack_l3proto.h>
26 #include <net/netfilter/nf_conntrack_l4proto.h>
27 #include <net/netfilter/nf_conntrack_expect.h>
28 #include <net/netfilter/nf_conntrack_helper.h>
29 #include <net/netfilter/nf_conntrack_acct.h>
30 #include <net/netfilter/nf_conntrack_zones.h>
32 MODULE_LICENSE("GPL");
36 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
37 const struct nf_conntrack_l3proto *l3proto,
38 const struct nf_conntrack_l4proto *l4proto)
40 return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
42 EXPORT_SYMBOL_GPL(print_tuple);
44 struct ct_iter_state {
45 struct seq_net_private p;
49 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
51 struct net *net = seq_file_net(seq);
52 struct ct_iter_state *st = seq->private;
53 struct hlist_nulls_node *n;
56 st->bucket < net->ct.htable_size;
58 n = rcu_dereference(net->ct.hash[st->bucket].first);
65 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
66 struct hlist_nulls_node *head)
68 struct net *net = seq_file_net(seq);
69 struct ct_iter_state *st = seq->private;
71 head = rcu_dereference(head->next);
72 while (is_a_nulls(head)) {
73 if (likely(get_nulls_value(head) == st->bucket)) {
74 if (++st->bucket >= net->ct.htable_size)
77 head = rcu_dereference(net->ct.hash[st->bucket].first);
82 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
84 struct hlist_nulls_node *head = ct_get_first(seq);
87 while (pos && (head = ct_get_next(seq, head)))
89 return pos ? NULL : head;
92 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
96 return ct_get_idx(seq, *pos);
99 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
102 return ct_get_next(s, v);
105 static void ct_seq_stop(struct seq_file *s, void *v)
111 /* return 0 on success, 1 in case of error */
112 static int ct_seq_show(struct seq_file *s, void *v)
114 struct nf_conntrack_tuple_hash *hash = v;
115 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
116 const struct nf_conntrack_l3proto *l3proto;
117 const struct nf_conntrack_l4proto *l4proto;
121 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
124 /* we only want to print DIR_ORIGINAL */
125 if (NF_CT_DIRECTION(hash))
128 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
129 NF_CT_ASSERT(l3proto);
130 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
131 NF_CT_ASSERT(l4proto);
134 if (seq_printf(s, "%-8s %u %-8s %u %ld ",
135 l3proto->name, nf_ct_l3num(ct),
136 l4proto->name, nf_ct_protonum(ct),
137 timer_pending(&ct->timeout)
138 ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
141 if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
144 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
148 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
151 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
152 if (seq_printf(s, "[UNREPLIED] "))
155 if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
159 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
162 if (test_bit(IPS_ASSURED_BIT, &ct->status))
163 if (seq_printf(s, "[ASSURED] "))
166 #if defined(CONFIG_NF_CONNTRACK_MARK)
167 if (seq_printf(s, "mark=%u ", ct->mark))
171 #ifdef CONFIG_NF_CONNTRACK_SECMARK
172 if (seq_printf(s, "secmark=%u ", ct->secmark))
176 #ifdef CONFIG_NF_CONNTRACK_ZONES
177 if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
181 if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
190 static const struct seq_operations ct_seq_ops = {
191 .start = ct_seq_start,
197 static int ct_open(struct inode *inode, struct file *file)
199 return seq_open_net(inode, file, &ct_seq_ops,
200 sizeof(struct ct_iter_state));
203 static const struct file_operations ct_file_ops = {
204 .owner = THIS_MODULE,
208 .release = seq_release_net,
211 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
213 struct net *net = seq_file_net(seq);
217 return SEQ_START_TOKEN;
219 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
220 if (!cpu_possible(cpu))
223 return per_cpu_ptr(net->ct.stat, cpu);
229 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
231 struct net *net = seq_file_net(seq);
234 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
235 if (!cpu_possible(cpu))
238 return per_cpu_ptr(net->ct.stat, cpu);
244 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
248 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
250 struct net *net = seq_file_net(seq);
251 unsigned int nr_conntracks = atomic_read(&net->ct.count);
252 const struct ip_conntrack_stat *st = v;
254 if (v == SEQ_START_TOKEN) {
255 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");
259 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
260 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
283 static const struct seq_operations ct_cpu_seq_ops = {
284 .start = ct_cpu_seq_start,
285 .next = ct_cpu_seq_next,
286 .stop = ct_cpu_seq_stop,
287 .show = ct_cpu_seq_show,
290 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
292 return seq_open_net(inode, file, &ct_cpu_seq_ops,
293 sizeof(struct seq_net_private));
296 static const struct file_operations ct_cpu_seq_fops = {
297 .owner = THIS_MODULE,
298 .open = ct_cpu_seq_open,
301 .release = seq_release_net,
304 static int nf_conntrack_standalone_init_proc(struct net *net)
306 struct proc_dir_entry *pde;
308 pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
310 goto out_nf_conntrack;
312 pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
315 goto out_stat_nf_conntrack;
318 out_stat_nf_conntrack:
319 proc_net_remove(net, "nf_conntrack");
324 static void nf_conntrack_standalone_fini_proc(struct net *net)
326 remove_proc_entry("nf_conntrack", net->proc_net_stat);
327 proc_net_remove(net, "nf_conntrack");
330 static int nf_conntrack_standalone_init_proc(struct net *net)
335 static void nf_conntrack_standalone_fini_proc(struct net *net)
338 #endif /* CONFIG_PROC_FS */
343 /* Log invalid packets of a given protocol */
344 static int log_invalid_proto_min = 0;
345 static int log_invalid_proto_max = 255;
347 static struct ctl_table_header *nf_ct_netfilter_header;
349 static ctl_table nf_ct_sysctl_table[] = {
351 .procname = "nf_conntrack_max",
352 .data = &nf_conntrack_max,
353 .maxlen = sizeof(int),
355 .proc_handler = proc_dointvec,
358 .procname = "nf_conntrack_count",
359 .data = &init_net.ct.count,
360 .maxlen = sizeof(int),
362 .proc_handler = proc_dointvec,
365 .procname = "nf_conntrack_buckets",
366 .data = &init_net.ct.htable_size,
367 .maxlen = sizeof(unsigned int),
369 .proc_handler = proc_dointvec,
372 .procname = "nf_conntrack_checksum",
373 .data = &init_net.ct.sysctl_checksum,
374 .maxlen = sizeof(unsigned int),
376 .proc_handler = proc_dointvec,
379 .procname = "nf_conntrack_log_invalid",
380 .data = &init_net.ct.sysctl_log_invalid,
381 .maxlen = sizeof(unsigned int),
383 .proc_handler = proc_dointvec_minmax,
384 .extra1 = &log_invalid_proto_min,
385 .extra2 = &log_invalid_proto_max,
388 .procname = "nf_conntrack_expect_max",
389 .data = &nf_ct_expect_max,
390 .maxlen = sizeof(int),
392 .proc_handler = proc_dointvec,
397 #define NET_NF_CONNTRACK_MAX 2089
399 static ctl_table nf_ct_netfilter_table[] = {
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", },
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[2].data = &net->ct.htable_size;
433 table[3].data = &net->ct.sysctl_checksum;
434 table[4].data = &net->ct.sysctl_log_invalid;
436 net->ct.sysctl_header = register_net_sysctl_table(net,
437 nf_net_netfilter_sysctl_path, table);
438 if (!net->ct.sysctl_header)
439 goto out_unregister_netfilter;
443 out_unregister_netfilter:
446 if (net_eq(net, &init_net))
447 unregister_sysctl_table(nf_ct_netfilter_header);
449 printk("nf_conntrack: can't register to sysctl.\n");
453 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
455 struct ctl_table *table;
457 if (net_eq(net, &init_net))
458 unregister_sysctl_table(nf_ct_netfilter_header);
459 table = net->ct.sysctl_header->ctl_table_arg;
460 unregister_net_sysctl_table(net->ct.sysctl_header);
464 static int nf_conntrack_standalone_init_sysctl(struct net *net)
469 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
472 #endif /* CONFIG_SYSCTL */
474 static int nf_conntrack_net_init(struct net *net)
478 ret = nf_conntrack_init(net);
481 ret = nf_conntrack_standalone_init_proc(net);
484 net->ct.sysctl_checksum = 1;
485 net->ct.sysctl_log_invalid = 0;
486 ret = nf_conntrack_standalone_init_sysctl(net);
492 nf_conntrack_standalone_fini_proc(net);
494 nf_conntrack_cleanup(net);
499 static void nf_conntrack_net_exit(struct net *net)
501 nf_conntrack_standalone_fini_sysctl(net);
502 nf_conntrack_standalone_fini_proc(net);
503 nf_conntrack_cleanup(net);
506 static struct pernet_operations nf_conntrack_net_ops = {
507 .init = nf_conntrack_net_init,
508 .exit = nf_conntrack_net_exit,
511 static int __init nf_conntrack_standalone_init(void)
513 return register_pernet_subsys(&nf_conntrack_net_ops);
516 static void __exit nf_conntrack_standalone_fini(void)
518 unregister_pernet_subsys(&nf_conntrack_net_ops);
521 module_init(nf_conntrack_standalone_init);
522 module_exit(nf_conntrack_standalone_fini);
524 /* Some modules need us, but don't depend directly on any symbol.
525 They should call this. */
526 void need_conntrack(void)
529 EXPORT_SYMBOL_GPL(need_conntrack);