x25: use limited socket backlog
[linux-2.6.git] / net / netfilter / nf_conntrack_standalone.c
1 /* (C) 1999-2001 Paul `Rusty' Russell
2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3  *
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.
7  */
8
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>
18 #ifdef CONFIG_SYSCTL
19 #include <linux/sysctl.h>
20 #endif
21
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>
29 #include <net/netfilter/nf_conntrack_zones.h>
30
31 MODULE_LICENSE("GPL");
32
33 #ifdef CONFIG_PROC_FS
34 int
35 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
36             const struct nf_conntrack_l3proto *l3proto,
37             const struct nf_conntrack_l4proto *l4proto)
38 {
39         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
40 }
41 EXPORT_SYMBOL_GPL(print_tuple);
42
43 struct ct_iter_state {
44         struct seq_net_private p;
45         unsigned int bucket;
46 };
47
48 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
49 {
50         struct net *net = seq_file_net(seq);
51         struct ct_iter_state *st = seq->private;
52         struct hlist_nulls_node *n;
53
54         for (st->bucket = 0;
55              st->bucket < net->ct.htable_size;
56              st->bucket++) {
57                 n = rcu_dereference(net->ct.hash[st->bucket].first);
58                 if (!is_a_nulls(n))
59                         return n;
60         }
61         return NULL;
62 }
63
64 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
65                                       struct hlist_nulls_node *head)
66 {
67         struct net *net = seq_file_net(seq);
68         struct ct_iter_state *st = seq->private;
69
70         head = rcu_dereference(head->next);
71         while (is_a_nulls(head)) {
72                 if (likely(get_nulls_value(head) == st->bucket)) {
73                         if (++st->bucket >= net->ct.htable_size)
74                                 return NULL;
75                 }
76                 head = rcu_dereference(net->ct.hash[st->bucket].first);
77         }
78         return head;
79 }
80
81 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
82 {
83         struct hlist_nulls_node *head = ct_get_first(seq);
84
85         if (head)
86                 while (pos && (head = ct_get_next(seq, head)))
87                         pos--;
88         return pos ? NULL : head;
89 }
90
91 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
92         __acquires(RCU)
93 {
94         rcu_read_lock();
95         return ct_get_idx(seq, *pos);
96 }
97
98 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
99 {
100         (*pos)++;
101         return ct_get_next(s, v);
102 }
103
104 static void ct_seq_stop(struct seq_file *s, void *v)
105         __releases(RCU)
106 {
107         rcu_read_unlock();
108 }
109
110 /* return 0 on success, 1 in case of error */
111 static int ct_seq_show(struct seq_file *s, void *v)
112 {
113         struct nf_conntrack_tuple_hash *hash = v;
114         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
115         const struct nf_conntrack_l3proto *l3proto;
116         const struct nf_conntrack_l4proto *l4proto;
117         int ret = 0;
118
119         NF_CT_ASSERT(ct);
120         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
121                 return 0;
122
123         /* we only want to print DIR_ORIGINAL */
124         if (NF_CT_DIRECTION(hash))
125                 goto release;
126
127         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
128         NF_CT_ASSERT(l3proto);
129         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
130         NF_CT_ASSERT(l4proto);
131
132         ret = -ENOSPC;
133         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
134                        l3proto->name, nf_ct_l3num(ct),
135                        l4proto->name, nf_ct_protonum(ct),
136                        timer_pending(&ct->timeout)
137                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
138                 goto release;
139
140         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
141                 goto release;
142
143         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
144                         l3proto, l4proto))
145                 goto release;
146
147         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
148                 goto release;
149
150         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
151                 if (seq_printf(s, "[UNREPLIED] "))
152                         goto release;
153
154         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
155                         l3proto, l4proto))
156                 goto release;
157
158         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
159                 goto release;
160
161         if (test_bit(IPS_ASSURED_BIT, &ct->status))
162                 if (seq_printf(s, "[ASSURED] "))
163                         goto release;
164
165 #if defined(CONFIG_NF_CONNTRACK_MARK)
166         if (seq_printf(s, "mark=%u ", ct->mark))
167                 goto release;
168 #endif
169
170 #ifdef CONFIG_NF_CONNTRACK_SECMARK
171         if (seq_printf(s, "secmark=%u ", ct->secmark))
172                 goto release;
173 #endif
174
175 #ifdef CONFIG_NF_CONNTRACK_ZONES
176         if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
177                 goto release;
178 #endif
179
180         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
181                 goto release;
182
183         ret = 0;
184 release:
185         nf_ct_put(ct);
186         return 0;
187 }
188
189 static const struct seq_operations ct_seq_ops = {
190         .start = ct_seq_start,
191         .next  = ct_seq_next,
192         .stop  = ct_seq_stop,
193         .show  = ct_seq_show
194 };
195
196 static int ct_open(struct inode *inode, struct file *file)
197 {
198         return seq_open_net(inode, file, &ct_seq_ops,
199                         sizeof(struct ct_iter_state));
200 }
201
202 static const struct file_operations ct_file_ops = {
203         .owner   = THIS_MODULE,
204         .open    = ct_open,
205         .read    = seq_read,
206         .llseek  = seq_lseek,
207         .release = seq_release_net,
208 };
209
210 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
211 {
212         struct net *net = seq_file_net(seq);
213         int cpu;
214
215         if (*pos == 0)
216                 return SEQ_START_TOKEN;
217
218         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
219                 if (!cpu_possible(cpu))
220                         continue;
221                 *pos = cpu + 1;
222                 return per_cpu_ptr(net->ct.stat, cpu);
223         }
224
225         return NULL;
226 }
227
228 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
229 {
230         struct net *net = seq_file_net(seq);
231         int cpu;
232
233         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
234                 if (!cpu_possible(cpu))
235                         continue;
236                 *pos = cpu + 1;
237                 return per_cpu_ptr(net->ct.stat, cpu);
238         }
239
240         return NULL;
241 }
242
243 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
244 {
245 }
246
247 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
248 {
249         struct net *net = seq_file_net(seq);
250         unsigned int nr_conntracks = atomic_read(&net->ct.count);
251         const struct ip_conntrack_stat *st = v;
252
253         if (v == SEQ_START_TOKEN) {
254                 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");
255                 return 0;
256         }
257
258         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
259                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
260                    nr_conntracks,
261                    st->searched,
262                    st->found,
263                    st->new,
264                    st->invalid,
265                    st->ignore,
266                    st->delete,
267                    st->delete_list,
268                    st->insert,
269                    st->insert_failed,
270                    st->drop,
271                    st->early_drop,
272                    st->error,
273
274                    st->expect_new,
275                    st->expect_create,
276                    st->expect_delete
277                 );
278         return 0;
279 }
280
281 static const struct seq_operations ct_cpu_seq_ops = {
282         .start  = ct_cpu_seq_start,
283         .next   = ct_cpu_seq_next,
284         .stop   = ct_cpu_seq_stop,
285         .show   = ct_cpu_seq_show,
286 };
287
288 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
289 {
290         return seq_open_net(inode, file, &ct_cpu_seq_ops,
291                             sizeof(struct seq_net_private));
292 }
293
294 static const struct file_operations ct_cpu_seq_fops = {
295         .owner   = THIS_MODULE,
296         .open    = ct_cpu_seq_open,
297         .read    = seq_read,
298         .llseek  = seq_lseek,
299         .release = seq_release_net,
300 };
301
302 static int nf_conntrack_standalone_init_proc(struct net *net)
303 {
304         struct proc_dir_entry *pde;
305
306         pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
307         if (!pde)
308                 goto out_nf_conntrack;
309
310         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
311                           &ct_cpu_seq_fops);
312         if (!pde)
313                 goto out_stat_nf_conntrack;
314         return 0;
315
316 out_stat_nf_conntrack:
317         proc_net_remove(net, "nf_conntrack");
318 out_nf_conntrack:
319         return -ENOMEM;
320 }
321
322 static void nf_conntrack_standalone_fini_proc(struct net *net)
323 {
324         remove_proc_entry("nf_conntrack", net->proc_net_stat);
325         proc_net_remove(net, "nf_conntrack");
326 }
327 #else
328 static int nf_conntrack_standalone_init_proc(struct net *net)
329 {
330         return 0;
331 }
332
333 static void nf_conntrack_standalone_fini_proc(struct net *net)
334 {
335 }
336 #endif /* CONFIG_PROC_FS */
337
338 /* Sysctl support */
339
340 #ifdef CONFIG_SYSCTL
341 /* Log invalid packets of a given protocol */
342 static int log_invalid_proto_min = 0;
343 static int log_invalid_proto_max = 255;
344
345 static struct ctl_table_header *nf_ct_netfilter_header;
346
347 static ctl_table nf_ct_sysctl_table[] = {
348         {
349                 .procname       = "nf_conntrack_max",
350                 .data           = &nf_conntrack_max,
351                 .maxlen         = sizeof(int),
352                 .mode           = 0644,
353                 .proc_handler   = proc_dointvec,
354         },
355         {
356                 .procname       = "nf_conntrack_count",
357                 .data           = &init_net.ct.count,
358                 .maxlen         = sizeof(int),
359                 .mode           = 0444,
360                 .proc_handler   = proc_dointvec,
361         },
362         {
363                 .procname       = "nf_conntrack_buckets",
364                 .data           = &init_net.ct.htable_size,
365                 .maxlen         = sizeof(unsigned int),
366                 .mode           = 0444,
367                 .proc_handler   = proc_dointvec,
368         },
369         {
370                 .procname       = "nf_conntrack_checksum",
371                 .data           = &init_net.ct.sysctl_checksum,
372                 .maxlen         = sizeof(unsigned int),
373                 .mode           = 0644,
374                 .proc_handler   = proc_dointvec,
375         },
376         {
377                 .procname       = "nf_conntrack_log_invalid",
378                 .data           = &init_net.ct.sysctl_log_invalid,
379                 .maxlen         = sizeof(unsigned int),
380                 .mode           = 0644,
381                 .proc_handler   = proc_dointvec_minmax,
382                 .extra1         = &log_invalid_proto_min,
383                 .extra2         = &log_invalid_proto_max,
384         },
385         {
386                 .procname       = "nf_conntrack_expect_max",
387                 .data           = &nf_ct_expect_max,
388                 .maxlen         = sizeof(int),
389                 .mode           = 0644,
390                 .proc_handler   = proc_dointvec,
391         },
392         { }
393 };
394
395 #define NET_NF_CONNTRACK_MAX 2089
396
397 static ctl_table nf_ct_netfilter_table[] = {
398         {
399                 .procname       = "nf_conntrack_max",
400                 .data           = &nf_conntrack_max,
401                 .maxlen         = sizeof(int),
402                 .mode           = 0644,
403                 .proc_handler   = proc_dointvec,
404         },
405         { }
406 };
407
408 static struct ctl_path nf_ct_path[] = {
409         { .procname = "net", },
410         { }
411 };
412
413 static int nf_conntrack_standalone_init_sysctl(struct net *net)
414 {
415         struct ctl_table *table;
416
417         if (net_eq(net, &init_net)) {
418                 nf_ct_netfilter_header =
419                        register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
420                 if (!nf_ct_netfilter_header)
421                         goto out;
422         }
423
424         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
425                         GFP_KERNEL);
426         if (!table)
427                 goto out_kmemdup;
428
429         table[1].data = &net->ct.count;
430         table[2].data = &net->ct.htable_size;
431         table[3].data = &net->ct.sysctl_checksum;
432         table[4].data = &net->ct.sysctl_log_invalid;
433
434         net->ct.sysctl_header = register_net_sysctl_table(net,
435                                         nf_net_netfilter_sysctl_path, table);
436         if (!net->ct.sysctl_header)
437                 goto out_unregister_netfilter;
438
439         return 0;
440
441 out_unregister_netfilter:
442         kfree(table);
443 out_kmemdup:
444         if (net_eq(net, &init_net))
445                 unregister_sysctl_table(nf_ct_netfilter_header);
446 out:
447         printk("nf_conntrack: can't register to sysctl.\n");
448         return -ENOMEM;
449 }
450
451 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
452 {
453         struct ctl_table *table;
454
455         if (net_eq(net, &init_net))
456                 unregister_sysctl_table(nf_ct_netfilter_header);
457         table = net->ct.sysctl_header->ctl_table_arg;
458         unregister_net_sysctl_table(net->ct.sysctl_header);
459         kfree(table);
460 }
461 #else
462 static int nf_conntrack_standalone_init_sysctl(struct net *net)
463 {
464         return 0;
465 }
466
467 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
468 {
469 }
470 #endif /* CONFIG_SYSCTL */
471
472 static int nf_conntrack_net_init(struct net *net)
473 {
474         int ret;
475
476         ret = nf_conntrack_init(net);
477         if (ret < 0)
478                 goto out_init;
479         ret = nf_conntrack_standalone_init_proc(net);
480         if (ret < 0)
481                 goto out_proc;
482         net->ct.sysctl_checksum = 1;
483         net->ct.sysctl_log_invalid = 0;
484         ret = nf_conntrack_standalone_init_sysctl(net);
485         if (ret < 0)
486                 goto out_sysctl;
487         return 0;
488
489 out_sysctl:
490         nf_conntrack_standalone_fini_proc(net);
491 out_proc:
492         nf_conntrack_cleanup(net);
493 out_init:
494         return ret;
495 }
496
497 static void nf_conntrack_net_exit(struct net *net)
498 {
499         nf_conntrack_standalone_fini_sysctl(net);
500         nf_conntrack_standalone_fini_proc(net);
501         nf_conntrack_cleanup(net);
502 }
503
504 static struct pernet_operations nf_conntrack_net_ops = {
505         .init = nf_conntrack_net_init,
506         .exit = nf_conntrack_net_exit,
507 };
508
509 static int __init nf_conntrack_standalone_init(void)
510 {
511         return register_pernet_subsys(&nf_conntrack_net_ops);
512 }
513
514 static void __exit nf_conntrack_standalone_fini(void)
515 {
516         unregister_pernet_subsys(&nf_conntrack_net_ops);
517 }
518
519 module_init(nf_conntrack_standalone_init);
520 module_exit(nf_conntrack_standalone_fini);
521
522 /* Some modules need us, but don't depend directly on any symbol.
523    They should call this. */
524 void need_conntrack(void)
525 {
526 }
527 EXPORT_SYMBOL_GPL(need_conntrack);