[NETFILTER]: x_tables: add missing ip6t_modulename aliases
[linux-2.6] / 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
29 MODULE_LICENSE("GPL");
30
31 #ifdef CONFIG_PROC_FS
32 int
33 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
34             struct nf_conntrack_l3proto *l3proto,
35             struct nf_conntrack_l4proto *l4proto)
36 {
37         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
38 }
39 EXPORT_SYMBOL_GPL(print_tuple);
40
41 #ifdef CONFIG_NF_CT_ACCT
42 static unsigned int
43 seq_print_counters(struct seq_file *s,
44                    const struct ip_conntrack_counter *counter)
45 {
46         return seq_printf(s, "packets=%llu bytes=%llu ",
47                           (unsigned long long)counter->packets,
48                           (unsigned long long)counter->bytes);
49 }
50 #else
51 #define seq_print_counters(x, y)        0
52 #endif
53
54 struct ct_iter_state {
55         unsigned int bucket;
56 };
57
58 static struct hlist_node *ct_get_first(struct seq_file *seq)
59 {
60         struct ct_iter_state *st = seq->private;
61
62         for (st->bucket = 0;
63              st->bucket < nf_conntrack_htable_size;
64              st->bucket++) {
65                 if (!hlist_empty(&nf_conntrack_hash[st->bucket]))
66                         return nf_conntrack_hash[st->bucket].first;
67         }
68         return NULL;
69 }
70
71 static struct hlist_node *ct_get_next(struct seq_file *seq,
72                                       struct hlist_node *head)
73 {
74         struct ct_iter_state *st = seq->private;
75
76         head = head->next;
77         while (head == NULL) {
78                 if (++st->bucket >= nf_conntrack_htable_size)
79                         return NULL;
80                 head = nf_conntrack_hash[st->bucket].first;
81         }
82         return head;
83 }
84
85 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
86 {
87         struct hlist_node *head = ct_get_first(seq);
88
89         if (head)
90                 while (pos && (head = ct_get_next(seq, head)))
91                         pos--;
92         return pos ? NULL : head;
93 }
94
95 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
96 {
97         read_lock_bh(&nf_conntrack_lock);
98         return ct_get_idx(seq, *pos);
99 }
100
101 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
102 {
103         (*pos)++;
104         return ct_get_next(s, v);
105 }
106
107 static void ct_seq_stop(struct seq_file *s, void *v)
108 {
109         read_unlock_bh(&nf_conntrack_lock);
110 }
111
112 /* return 0 on success, 1 in case of error */
113 static int ct_seq_show(struct seq_file *s, void *v)
114 {
115         const struct nf_conntrack_tuple_hash *hash = v;
116         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
117         struct nf_conntrack_l3proto *l3proto;
118         struct nf_conntrack_l4proto *l4proto;
119
120         NF_CT_ASSERT(conntrack);
121
122         /* we only want to print DIR_ORIGINAL */
123         if (NF_CT_DIRECTION(hash))
124                 return 0;
125
126         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
127                                        .tuple.src.l3num);
128
129         NF_CT_ASSERT(l3proto);
130         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
131                                    .tuple.src.l3num,
132                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
133                                    .tuple.dst.protonum);
134         NF_CT_ASSERT(l4proto);
135
136         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
137                        l3proto->name,
138                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
139                        l4proto->name,
140                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
141                        timer_pending(&conntrack->timeout)
142                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
143                 return -ENOSPC;
144
145         if (l3proto->print_conntrack(s, conntrack))
146                 return -ENOSPC;
147
148         if (l4proto->print_conntrack(s, conntrack))
149                 return -ENOSPC;
150
151         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
152                         l3proto, l4proto))
153                 return -ENOSPC;
154
155         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
156                 return -ENOSPC;
157
158         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
159                 if (seq_printf(s, "[UNREPLIED] "))
160                         return -ENOSPC;
161
162         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
163                         l3proto, l4proto))
164                 return -ENOSPC;
165
166         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
167                 return -ENOSPC;
168
169         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
170                 if (seq_printf(s, "[ASSURED] "))
171                         return -ENOSPC;
172
173 #if defined(CONFIG_NF_CONNTRACK_MARK)
174         if (seq_printf(s, "mark=%u ", conntrack->mark))
175                 return -ENOSPC;
176 #endif
177
178 #ifdef CONFIG_NF_CONNTRACK_SECMARK
179         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
180                 return -ENOSPC;
181 #endif
182
183         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
184                 return -ENOSPC;
185
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_private(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_private,
208 };
209
210 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
211 {
212         int cpu;
213
214         if (*pos == 0)
215                 return SEQ_START_TOKEN;
216
217         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
218                 if (!cpu_possible(cpu))
219                         continue;
220                 *pos = cpu + 1;
221                 return &per_cpu(nf_conntrack_stat, cpu);
222         }
223
224         return NULL;
225 }
226
227 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
228 {
229         int cpu;
230
231         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
232                 if (!cpu_possible(cpu))
233                         continue;
234                 *pos = cpu + 1;
235                 return &per_cpu(nf_conntrack_stat, cpu);
236         }
237
238         return NULL;
239 }
240
241 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
242 {
243 }
244
245 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
246 {
247         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
248         struct ip_conntrack_stat *st = v;
249
250         if (v == SEQ_START_TOKEN) {
251                 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                 return 0;
253         }
254
255         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
256                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
257                    nr_conntracks,
258                    st->searched,
259                    st->found,
260                    st->new,
261                    st->invalid,
262                    st->ignore,
263                    st->delete,
264                    st->delete_list,
265                    st->insert,
266                    st->insert_failed,
267                    st->drop,
268                    st->early_drop,
269                    st->error,
270
271                    st->expect_new,
272                    st->expect_create,
273                    st->expect_delete
274                 );
275         return 0;
276 }
277
278 static const struct seq_operations ct_cpu_seq_ops = {
279         .start  = ct_cpu_seq_start,
280         .next   = ct_cpu_seq_next,
281         .stop   = ct_cpu_seq_stop,
282         .show   = ct_cpu_seq_show,
283 };
284
285 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
286 {
287         return seq_open(file, &ct_cpu_seq_ops);
288 }
289
290 static const struct file_operations ct_cpu_seq_fops = {
291         .owner   = THIS_MODULE,
292         .open    = ct_cpu_seq_open,
293         .read    = seq_read,
294         .llseek  = seq_lseek,
295         .release = seq_release_private,
296 };
297 #endif /* CONFIG_PROC_FS */
298
299 /* Sysctl support */
300
301 int nf_conntrack_checksum __read_mostly = 1;
302 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
303
304 #ifdef CONFIG_SYSCTL
305 /* Log invalid packets of a given protocol */
306 static int log_invalid_proto_min = 0;
307 static int log_invalid_proto_max = 255;
308
309 static struct ctl_table_header *nf_ct_sysctl_header;
310
311 static ctl_table nf_ct_sysctl_table[] = {
312         {
313                 .ctl_name       = NET_NF_CONNTRACK_MAX,
314                 .procname       = "nf_conntrack_max",
315                 .data           = &nf_conntrack_max,
316                 .maxlen         = sizeof(int),
317                 .mode           = 0644,
318                 .proc_handler   = &proc_dointvec,
319         },
320         {
321                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
322                 .procname       = "nf_conntrack_count",
323                 .data           = &nf_conntrack_count,
324                 .maxlen         = sizeof(int),
325                 .mode           = 0444,
326                 .proc_handler   = &proc_dointvec,
327         },
328         {
329                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
330                 .procname       = "nf_conntrack_buckets",
331                 .data           = &nf_conntrack_htable_size,
332                 .maxlen         = sizeof(unsigned int),
333                 .mode           = 0444,
334                 .proc_handler   = &proc_dointvec,
335         },
336         {
337                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
338                 .procname       = "nf_conntrack_checksum",
339                 .data           = &nf_conntrack_checksum,
340                 .maxlen         = sizeof(unsigned int),
341                 .mode           = 0644,
342                 .proc_handler   = &proc_dointvec,
343         },
344         {
345                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
346                 .procname       = "nf_conntrack_log_invalid",
347                 .data           = &nf_ct_log_invalid,
348                 .maxlen         = sizeof(unsigned int),
349                 .mode           = 0644,
350                 .proc_handler   = &proc_dointvec_minmax,
351                 .strategy       = &sysctl_intvec,
352                 .extra1         = &log_invalid_proto_min,
353                 .extra2         = &log_invalid_proto_max,
354         },
355         {
356                 .ctl_name       = CTL_UNNUMBERED,
357                 .procname       = "nf_conntrack_expect_max",
358                 .data           = &nf_ct_expect_max,
359                 .maxlen         = sizeof(int),
360                 .mode           = 0644,
361                 .proc_handler   = &proc_dointvec,
362         },
363         { .ctl_name = 0 }
364 };
365
366 #define NET_NF_CONNTRACK_MAX 2089
367
368 static ctl_table nf_ct_netfilter_table[] = {
369         {
370                 .ctl_name       = NET_NETFILTER,
371                 .procname       = "netfilter",
372                 .mode           = 0555,
373                 .child          = nf_ct_sysctl_table,
374         },
375         {
376                 .ctl_name       = NET_NF_CONNTRACK_MAX,
377                 .procname       = "nf_conntrack_max",
378                 .data           = &nf_conntrack_max,
379                 .maxlen         = sizeof(int),
380                 .mode           = 0644,
381                 .proc_handler   = &proc_dointvec,
382         },
383         { .ctl_name = 0 }
384 };
385
386 static ctl_table nf_ct_net_table[] = {
387         {
388                 .ctl_name       = CTL_NET,
389                 .procname       = "net",
390                 .mode           = 0555,
391                 .child          = nf_ct_netfilter_table,
392         },
393         { .ctl_name = 0 }
394 };
395 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
396 #endif /* CONFIG_SYSCTL */
397
398 static int __init nf_conntrack_standalone_init(void)
399 {
400 #ifdef CONFIG_PROC_FS
401         struct proc_dir_entry *proc, *proc_stat;
402 #endif
403         int ret = 0;
404
405         ret = nf_conntrack_init();
406         if (ret < 0)
407                 return ret;
408
409 #ifdef CONFIG_PROC_FS
410         proc = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
411         if (!proc) goto cleanup_init;
412
413         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, init_net.proc_net_stat);
414         if (!proc_stat)
415                 goto cleanup_proc;
416
417         proc_stat->proc_fops = &ct_cpu_seq_fops;
418         proc_stat->owner = THIS_MODULE;
419 #endif
420 #ifdef CONFIG_SYSCTL
421         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table);
422         if (nf_ct_sysctl_header == NULL) {
423                 printk("nf_conntrack: can't register to sysctl.\n");
424                 ret = -ENOMEM;
425                 goto cleanup_proc_stat;
426         }
427 #endif
428         return ret;
429
430 #ifdef CONFIG_SYSCTL
431  cleanup_proc_stat:
432 #endif
433 #ifdef CONFIG_PROC_FS
434         remove_proc_entry("nf_conntrack", init_net. proc_net_stat);
435  cleanup_proc:
436         proc_net_remove(&init_net, "nf_conntrack");
437  cleanup_init:
438 #endif /* CNFIG_PROC_FS */
439         nf_conntrack_cleanup();
440         return ret;
441 }
442
443 static void __exit nf_conntrack_standalone_fini(void)
444 {
445 #ifdef CONFIG_SYSCTL
446         unregister_sysctl_table(nf_ct_sysctl_header);
447 #endif
448 #ifdef CONFIG_PROC_FS
449         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
450         proc_net_remove(&init_net, "nf_conntrack");
451 #endif /* CNFIG_PROC_FS */
452         nf_conntrack_cleanup();
453 }
454
455 module_init(nf_conntrack_standalone_init);
456 module_exit(nf_conntrack_standalone_fini);
457
458 /* Some modules need us, but don't depend directly on any symbol.
459    They should call this. */
460 void need_conntrack(void)
461 {
462 }
463 EXPORT_SYMBOL_GPL(need_conntrack);