[NETFILTER]: nf_conntrack: move conntrack protocol sysctls to individual modules
[linux-2.6.git] / net / netfilter / nf_conntrack_standalone.c
1 /* This file contains all the functions required for the standalone
2    nf_conntrack module.
3
4    These are not required by the compatibility layer.
5 */
6
7 /* (C) 1999-2001 Paul `Rusty' Russell
8  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
15  *      - generalize L3 protocol dependent part.
16  *
17  * Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
18  */
19
20 #include <linux/types.h>
21 #include <linux/netfilter.h>
22 #include <linux/module.h>
23 #include <linux/skbuff.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/percpu.h>
27 #include <linux/netdevice.h>
28 #ifdef CONFIG_SYSCTL
29 #include <linux/sysctl.h>
30 #endif
31
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_l3proto.h>
35 #include <net/netfilter/nf_conntrack_l4proto.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38
39 #if 0
40 #define DEBUGP printk
41 #else
42 #define DEBUGP(format, args...)
43 #endif
44
45 MODULE_LICENSE("GPL");
46
47 #ifdef CONFIG_PROC_FS
48 int
49 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
50             struct nf_conntrack_l3proto *l3proto,
51             struct nf_conntrack_l4proto *l4proto)
52 {
53         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
54 }
55
56 #ifdef CONFIG_NF_CT_ACCT
57 static unsigned int
58 seq_print_counters(struct seq_file *s,
59                    const struct ip_conntrack_counter *counter)
60 {
61         return seq_printf(s, "packets=%llu bytes=%llu ",
62                           (unsigned long long)counter->packets,
63                           (unsigned long long)counter->bytes);
64 }
65 #else
66 #define seq_print_counters(x, y)        0
67 #endif
68
69 struct ct_iter_state {
70         unsigned int bucket;
71 };
72
73 static struct list_head *ct_get_first(struct seq_file *seq)
74 {
75         struct ct_iter_state *st = seq->private;
76
77         for (st->bucket = 0;
78              st->bucket < nf_conntrack_htable_size;
79              st->bucket++) {
80                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
81                         return nf_conntrack_hash[st->bucket].next;
82         }
83         return NULL;
84 }
85
86 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
87 {
88         struct ct_iter_state *st = seq->private;
89
90         head = head->next;
91         while (head == &nf_conntrack_hash[st->bucket]) {
92                 if (++st->bucket >= nf_conntrack_htable_size)
93                         return NULL;
94                 head = nf_conntrack_hash[st->bucket].next;
95         }
96         return head;
97 }
98
99 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
100 {
101         struct list_head *head = ct_get_first(seq);
102
103         if (head)
104                 while (pos && (head = ct_get_next(seq, head)))
105                         pos--;
106         return pos ? NULL : head;
107 }
108
109 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
110 {
111         read_lock_bh(&nf_conntrack_lock);
112         return ct_get_idx(seq, *pos);
113 }
114
115 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
116 {
117         (*pos)++;
118         return ct_get_next(s, v);
119 }
120
121 static void ct_seq_stop(struct seq_file *s, void *v)
122 {
123         read_unlock_bh(&nf_conntrack_lock);
124 }
125
126 /* return 0 on success, 1 in case of error */
127 static int ct_seq_show(struct seq_file *s, void *v)
128 {
129         const struct nf_conntrack_tuple_hash *hash = v;
130         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
131         struct nf_conntrack_l3proto *l3proto;
132         struct nf_conntrack_l4proto *l4proto;
133
134         NF_CT_ASSERT(conntrack);
135
136         /* we only want to print DIR_ORIGINAL */
137         if (NF_CT_DIRECTION(hash))
138                 return 0;
139
140         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
141                                        .tuple.src.l3num);
142
143         NF_CT_ASSERT(l3proto);
144         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
145                                    .tuple.src.l3num,
146                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
147                                    .tuple.dst.protonum);
148         NF_CT_ASSERT(l4proto);
149
150         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
151                        l3proto->name,
152                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
153                        l4proto->name,
154                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
155                        timer_pending(&conntrack->timeout)
156                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
157                 return -ENOSPC;
158
159         if (l3proto->print_conntrack(s, conntrack))
160                 return -ENOSPC;
161
162         if (l4proto->print_conntrack(s, conntrack))
163                 return -ENOSPC;
164
165         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
166                         l3proto, l4proto))
167                 return -ENOSPC;
168
169         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
170                 return -ENOSPC;
171
172         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
173                 if (seq_printf(s, "[UNREPLIED] "))
174                         return -ENOSPC;
175
176         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
177                         l3proto, l4proto))
178                 return -ENOSPC;
179
180         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
181                 return -ENOSPC;
182
183         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
184                 if (seq_printf(s, "[ASSURED] "))
185                         return -ENOSPC;
186
187 #if defined(CONFIG_NF_CONNTRACK_MARK)
188         if (seq_printf(s, "mark=%u ", conntrack->mark))
189                 return -ENOSPC;
190 #endif
191
192 #ifdef CONFIG_NF_CONNTRACK_SECMARK
193         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
194                 return -ENOSPC;
195 #endif
196
197         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
198                 return -ENOSPC;
199         
200         return 0;
201 }
202
203 static struct seq_operations ct_seq_ops = {
204         .start = ct_seq_start,
205         .next  = ct_seq_next,
206         .stop  = ct_seq_stop,
207         .show  = ct_seq_show
208 };
209
210 static int ct_open(struct inode *inode, struct file *file)
211 {
212         struct seq_file *seq;
213         struct ct_iter_state *st;
214         int ret;
215
216         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
217         if (st == NULL)
218                 return -ENOMEM;
219         ret = seq_open(file, &ct_seq_ops);
220         if (ret)
221                 goto out_free;
222         seq          = file->private_data;
223         seq->private = st;
224         memset(st, 0, sizeof(struct ct_iter_state));
225         return ret;
226 out_free:
227         kfree(st);
228         return ret;
229 }
230
231 static struct file_operations ct_file_ops = {
232         .owner   = THIS_MODULE,
233         .open    = ct_open,
234         .read    = seq_read,
235         .llseek  = seq_lseek,
236         .release = seq_release_private,
237 };
238
239 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
240 {
241         int cpu;
242
243         if (*pos == 0)
244                 return SEQ_START_TOKEN;
245
246         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
247                 if (!cpu_possible(cpu))
248                         continue;
249                 *pos = cpu + 1;
250                 return &per_cpu(nf_conntrack_stat, cpu);
251         }
252
253         return NULL;
254 }
255
256 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
257 {
258         int cpu;
259
260         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
261                 if (!cpu_possible(cpu))
262                         continue;
263                 *pos = cpu + 1;
264                 return &per_cpu(nf_conntrack_stat, cpu);
265         }
266
267         return NULL;
268 }
269
270 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
271 {
272 }
273
274 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
275 {
276         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
277         struct ip_conntrack_stat *st = v;
278
279         if (v == SEQ_START_TOKEN) {
280                 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");
281                 return 0;
282         }
283
284         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
285                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
286                    nr_conntracks,
287                    st->searched,
288                    st->found,
289                    st->new,
290                    st->invalid,
291                    st->ignore,
292                    st->delete,
293                    st->delete_list,
294                    st->insert,
295                    st->insert_failed,
296                    st->drop,
297                    st->early_drop,
298                    st->error,
299
300                    st->expect_new,
301                    st->expect_create,
302                    st->expect_delete
303                 );
304         return 0;
305 }
306
307 static struct seq_operations ct_cpu_seq_ops = {
308         .start  = ct_cpu_seq_start,
309         .next   = ct_cpu_seq_next,
310         .stop   = ct_cpu_seq_stop,
311         .show   = ct_cpu_seq_show,
312 };
313
314 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
315 {
316         return seq_open(file, &ct_cpu_seq_ops);
317 }
318
319 static struct file_operations ct_cpu_seq_fops = {
320         .owner   = THIS_MODULE,
321         .open    = ct_cpu_seq_open,
322         .read    = seq_read,
323         .llseek  = seq_lseek,
324         .release = seq_release_private,
325 };
326 #endif /* CONFIG_PROC_FS */
327
328 /* Sysctl support */
329
330 int nf_conntrack_checksum __read_mostly = 1;
331
332 #ifdef CONFIG_SYSCTL
333 /* Log invalid packets of a given protocol */
334 static int log_invalid_proto_min = 0;
335 static int log_invalid_proto_max = 255;
336
337 static struct ctl_table_header *nf_ct_sysctl_header;
338
339 static ctl_table nf_ct_sysctl_table[] = {
340         {
341                 .ctl_name       = NET_NF_CONNTRACK_MAX,
342                 .procname       = "nf_conntrack_max",
343                 .data           = &nf_conntrack_max,
344                 .maxlen         = sizeof(int),
345                 .mode           = 0644,
346                 .proc_handler   = &proc_dointvec,
347         },
348         {
349                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
350                 .procname       = "nf_conntrack_count",
351                 .data           = &nf_conntrack_count,
352                 .maxlen         = sizeof(int),
353                 .mode           = 0444,
354                 .proc_handler   = &proc_dointvec,
355         },
356         {
357                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
358                 .procname       = "nf_conntrack_buckets",
359                 .data           = &nf_conntrack_htable_size,
360                 .maxlen         = sizeof(unsigned int),
361                 .mode           = 0444,
362                 .proc_handler   = &proc_dointvec,
363         },
364         {
365                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
366                 .procname       = "nf_conntrack_checksum",
367                 .data           = &nf_conntrack_checksum,
368                 .maxlen         = sizeof(unsigned int),
369                 .mode           = 0644,
370                 .proc_handler   = &proc_dointvec,
371         },
372         {
373                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
374                 .procname       = "nf_conntrack_log_invalid",
375                 .data           = &nf_ct_log_invalid,
376                 .maxlen         = sizeof(unsigned int),
377                 .mode           = 0644,
378                 .proc_handler   = &proc_dointvec_minmax,
379                 .strategy       = &sysctl_intvec,
380                 .extra1         = &log_invalid_proto_min,
381                 .extra2         = &log_invalid_proto_max,
382         },
383
384         { .ctl_name = 0 }
385 };
386
387 #define NET_NF_CONNTRACK_MAX 2089
388
389 static ctl_table nf_ct_netfilter_table[] = {
390         {
391                 .ctl_name       = NET_NETFILTER,
392                 .procname       = "netfilter",
393                 .mode           = 0555,
394                 .child          = nf_ct_sysctl_table,
395         },
396         {
397                 .ctl_name       = NET_NF_CONNTRACK_MAX,
398                 .procname       = "nf_conntrack_max",
399                 .data           = &nf_conntrack_max,
400                 .maxlen         = sizeof(int),
401                 .mode           = 0644,
402                 .proc_handler   = &proc_dointvec,
403         },
404         { .ctl_name = 0 }
405 };
406
407 static ctl_table nf_ct_net_table[] = {
408         {
409                 .ctl_name       = CTL_NET,
410                 .procname       = "net",
411                 .mode           = 0555,
412                 .child          = nf_ct_netfilter_table,
413         },
414         { .ctl_name = 0 }
415 };
416 EXPORT_SYMBOL(nf_ct_log_invalid);
417 #endif /* CONFIG_SYSCTL */
418
419 static int __init nf_conntrack_standalone_init(void)
420 {
421 #ifdef CONFIG_PROC_FS
422         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
423 #endif
424         int ret = 0;
425
426         ret = nf_conntrack_init();
427         if (ret < 0)
428                 return ret;
429
430 #ifdef CONFIG_PROC_FS
431         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
432         if (!proc) goto cleanup_init;
433
434         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
435                                         &exp_file_ops);
436         if (!proc_exp) goto cleanup_proc;
437
438         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
439         if (!proc_stat)
440                 goto cleanup_proc_exp;
441
442         proc_stat->proc_fops = &ct_cpu_seq_fops;
443         proc_stat->owner = THIS_MODULE;
444 #endif
445 #ifdef CONFIG_SYSCTL
446         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
447         if (nf_ct_sysctl_header == NULL) {
448                 printk("nf_conntrack: can't register to sysctl.\n");
449                 ret = -ENOMEM;
450                 goto cleanup_proc_stat;
451         }
452 #endif
453         return ret;
454
455 #ifdef CONFIG_SYSCTL
456  cleanup_proc_stat:
457 #endif
458 #ifdef CONFIG_PROC_FS
459         remove_proc_entry("nf_conntrack", proc_net_stat);
460  cleanup_proc_exp:
461         proc_net_remove("nf_conntrack_expect");
462  cleanup_proc:
463         proc_net_remove("nf_conntrack");
464  cleanup_init:
465 #endif /* CNFIG_PROC_FS */
466         nf_conntrack_cleanup();
467         return ret;
468 }
469
470 static void __exit nf_conntrack_standalone_fini(void)
471 {
472 #ifdef CONFIG_SYSCTL
473         unregister_sysctl_table(nf_ct_sysctl_header);
474 #endif
475 #ifdef CONFIG_PROC_FS
476         remove_proc_entry("nf_conntrack", proc_net_stat);
477         proc_net_remove("nf_conntrack_expect");
478         proc_net_remove("nf_conntrack");
479 #endif /* CNFIG_PROC_FS */
480         nf_conntrack_cleanup();
481 }
482
483 module_init(nf_conntrack_standalone_init);
484 module_exit(nf_conntrack_standalone_fini);
485
486 /* Some modules need us, but don't depend directly on any symbol.
487    They should call this. */
488 void need_conntrack(void)
489 {
490 }
491
492 #ifdef CONFIG_NF_CONNTRACK_EVENTS
493 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
494 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
495 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
496 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
497 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
498 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
499 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
500 #endif
501 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
502 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
503 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
504 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
505 EXPORT_SYMBOL(nf_conntrack_l4proto_register);
506 EXPORT_SYMBOL(nf_conntrack_l4proto_unregister);
507 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
508 EXPORT_SYMBOL(nf_conntrack_destroyed);
509 EXPORT_SYMBOL(need_conntrack);
510 EXPORT_SYMBOL(nf_conntrack_helper_register);
511 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
512 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
513 EXPORT_SYMBOL(__nf_ct_refresh_acct);
514 EXPORT_SYMBOL(nf_ct_protos);
515 EXPORT_SYMBOL(__nf_ct_l4proto_find);
516 EXPORT_SYMBOL(nf_ct_l4proto_find_get);
517 EXPORT_SYMBOL(nf_ct_l4proto_put);
518 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
519 EXPORT_SYMBOL(nf_ct_l3proto_put);
520 EXPORT_SYMBOL(nf_ct_l3protos);
521 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
522 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
523 EXPORT_SYMBOL(nf_conntrack_expect_put);
524 EXPORT_SYMBOL(nf_conntrack_expect_related);
525 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
526 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
527 EXPORT_SYMBOL(nf_conntrack_htable_size);
528 EXPORT_SYMBOL(nf_conntrack_lock);
529 EXPORT_SYMBOL(nf_conntrack_hash);
530 EXPORT_SYMBOL(nf_conntrack_untracked);
531 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
532 #ifdef CONFIG_IP_NF_NAT_NEEDED
533 EXPORT_SYMBOL(nf_conntrack_tcp_update);
534 #endif
535 EXPORT_SYMBOL(__nf_conntrack_confirm);
536 EXPORT_SYMBOL(nf_ct_get_tuple);
537 EXPORT_SYMBOL(nf_ct_invert_tuple);
538 EXPORT_SYMBOL(nf_conntrack_in);
539 EXPORT_SYMBOL(__nf_conntrack_attach);
540 EXPORT_SYMBOL(nf_conntrack_alloc);
541 EXPORT_SYMBOL(nf_conntrack_free);
542 EXPORT_SYMBOL(nf_conntrack_flush);
543 EXPORT_SYMBOL(nf_ct_remove_expectations);
544 EXPORT_SYMBOL(nf_ct_helper_find_get);
545 EXPORT_SYMBOL(nf_ct_helper_put);
546 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
547 EXPORT_SYMBOL(__nf_conntrack_find);
548 EXPORT_SYMBOL(nf_ct_unlink_expect);
549 EXPORT_SYMBOL(nf_conntrack_hash_insert);
550 EXPORT_SYMBOL(__nf_conntrack_expect_find);
551 EXPORT_SYMBOL(nf_conntrack_expect_find);
552 EXPORT_SYMBOL(nf_conntrack_expect_list);
553 #if defined(CONFIG_NF_CT_NETLINK) || \
554     defined(CONFIG_NF_CT_NETLINK_MODULE)
555 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
556 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
557 #endif