Merge git://git.kernel.org/pub/scm/linux/kernel/git/jk/spufs
[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             const struct nf_conntrack_l3proto *l3proto,
35             const 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         struct hlist_node *n;
62
63         for (st->bucket = 0;
64              st->bucket < nf_conntrack_htable_size;
65              st->bucket++) {
66                 n = rcu_dereference(nf_conntrack_hash[st->bucket].first);
67                 if (n)
68                         return n;
69         }
70         return NULL;
71 }
72
73 static struct hlist_node *ct_get_next(struct seq_file *seq,
74                                       struct hlist_node *head)
75 {
76         struct ct_iter_state *st = seq->private;
77
78         head = rcu_dereference(head->next);
79         while (head == NULL) {
80                 if (++st->bucket >= nf_conntrack_htable_size)
81                         return NULL;
82                 head = rcu_dereference(nf_conntrack_hash[st->bucket].first);
83         }
84         return head;
85 }
86
87 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
88 {
89         struct hlist_node *head = ct_get_first(seq);
90
91         if (head)
92                 while (pos && (head = ct_get_next(seq, head)))
93                         pos--;
94         return pos ? NULL : head;
95 }
96
97 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
98         __acquires(RCU)
99 {
100         rcu_read_lock();
101         return ct_get_idx(seq, *pos);
102 }
103
104 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
105 {
106         (*pos)++;
107         return ct_get_next(s, v);
108 }
109
110 static void ct_seq_stop(struct seq_file *s, void *v)
111         __releases(RCU)
112 {
113         rcu_read_unlock();
114 }
115
116 /* return 0 on success, 1 in case of error */
117 static int ct_seq_show(struct seq_file *s, void *v)
118 {
119         const struct nf_conntrack_tuple_hash *hash = v;
120         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
121         const struct nf_conntrack_l3proto *l3proto;
122         const struct nf_conntrack_l4proto *l4proto;
123
124         NF_CT_ASSERT(ct);
125
126         /* we only want to print DIR_ORIGINAL */
127         if (NF_CT_DIRECTION(hash))
128                 return 0;
129
130         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
131         NF_CT_ASSERT(l3proto);
132         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
133         NF_CT_ASSERT(l4proto);
134
135         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
136                        l3proto->name, nf_ct_l3num(ct),
137                        l4proto->name, nf_ct_protonum(ct),
138                        timer_pending(&ct->timeout)
139                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
140                 return -ENOSPC;
141
142         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
143                 return -ENOSPC;
144
145         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
146                         l3proto, l4proto))
147                 return -ENOSPC;
148
149         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
150                 return -ENOSPC;
151
152         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
153                 if (seq_printf(s, "[UNREPLIED] "))
154                         return -ENOSPC;
155
156         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
157                         l3proto, l4proto))
158                 return -ENOSPC;
159
160         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
161                 return -ENOSPC;
162
163         if (test_bit(IPS_ASSURED_BIT, &ct->status))
164                 if (seq_printf(s, "[ASSURED] "))
165                         return -ENOSPC;
166
167 #if defined(CONFIG_NF_CONNTRACK_MARK)
168         if (seq_printf(s, "mark=%u ", ct->mark))
169                 return -ENOSPC;
170 #endif
171
172 #ifdef CONFIG_NF_CONNTRACK_SECMARK
173         if (seq_printf(s, "secmark=%u ", ct->secmark))
174                 return -ENOSPC;
175 #endif
176
177         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
178                 return -ENOSPC;
179
180         return 0;
181 }
182
183 static const struct seq_operations ct_seq_ops = {
184         .start = ct_seq_start,
185         .next  = ct_seq_next,
186         .stop  = ct_seq_stop,
187         .show  = ct_seq_show
188 };
189
190 static int ct_open(struct inode *inode, struct file *file)
191 {
192         return seq_open_private(file, &ct_seq_ops,
193                         sizeof(struct ct_iter_state));
194 }
195
196 static const struct file_operations ct_file_ops = {
197         .owner   = THIS_MODULE,
198         .open    = ct_open,
199         .read    = seq_read,
200         .llseek  = seq_lseek,
201         .release = seq_release_private,
202 };
203
204 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
205 {
206         int cpu;
207
208         if (*pos == 0)
209                 return SEQ_START_TOKEN;
210
211         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
212                 if (!cpu_possible(cpu))
213                         continue;
214                 *pos = cpu + 1;
215                 return &per_cpu(nf_conntrack_stat, cpu);
216         }
217
218         return NULL;
219 }
220
221 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
222 {
223         int cpu;
224
225         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
226                 if (!cpu_possible(cpu))
227                         continue;
228                 *pos = cpu + 1;
229                 return &per_cpu(nf_conntrack_stat, cpu);
230         }
231
232         return NULL;
233 }
234
235 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
236 {
237 }
238
239 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
240 {
241         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
242         const struct ip_conntrack_stat *st = v;
243
244         if (v == SEQ_START_TOKEN) {
245                 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");
246                 return 0;
247         }
248
249         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
250                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
251                    nr_conntracks,
252                    st->searched,
253                    st->found,
254                    st->new,
255                    st->invalid,
256                    st->ignore,
257                    st->delete,
258                    st->delete_list,
259                    st->insert,
260                    st->insert_failed,
261                    st->drop,
262                    st->early_drop,
263                    st->error,
264
265                    st->expect_new,
266                    st->expect_create,
267                    st->expect_delete
268                 );
269         return 0;
270 }
271
272 static const struct seq_operations ct_cpu_seq_ops = {
273         .start  = ct_cpu_seq_start,
274         .next   = ct_cpu_seq_next,
275         .stop   = ct_cpu_seq_stop,
276         .show   = ct_cpu_seq_show,
277 };
278
279 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
280 {
281         return seq_open(file, &ct_cpu_seq_ops);
282 }
283
284 static const struct file_operations ct_cpu_seq_fops = {
285         .owner   = THIS_MODULE,
286         .open    = ct_cpu_seq_open,
287         .read    = seq_read,
288         .llseek  = seq_lseek,
289         .release = seq_release,
290 };
291
292 static int nf_conntrack_standalone_init_proc(void)
293 {
294         struct proc_dir_entry *pde;
295
296         pde = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
297         if (!pde)
298                 goto out_nf_conntrack;
299         pde = create_proc_entry("nf_conntrack", S_IRUGO, init_net.proc_net_stat);
300         if (!pde)
301                 goto out_stat_nf_conntrack;
302         pde->proc_fops = &ct_cpu_seq_fops;
303         pde->owner = THIS_MODULE;
304         return 0;
305
306 out_stat_nf_conntrack:
307         proc_net_remove(&init_net, "nf_conntrack");
308 out_nf_conntrack:
309         return -ENOMEM;
310 }
311
312 static void nf_conntrack_standalone_fini_proc(void)
313 {
314         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
315         proc_net_remove(&init_net, "nf_conntrack");
316 }
317 #else
318 static int nf_conntrack_standalone_init_proc(void)
319 {
320         return 0;
321 }
322
323 static void nf_conntrack_standalone_fini_proc(void)
324 {
325 }
326 #endif /* CONFIG_PROC_FS */
327
328 /* Sysctl support */
329
330 int nf_conntrack_checksum __read_mostly = 1;
331 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
332
333 #ifdef CONFIG_SYSCTL
334 /* Log invalid packets of a given protocol */
335 static int log_invalid_proto_min = 0;
336 static int log_invalid_proto_max = 255;
337
338 static struct ctl_table_header *nf_ct_sysctl_header;
339
340 static ctl_table nf_ct_sysctl_table[] = {
341         {
342                 .ctl_name       = NET_NF_CONNTRACK_MAX,
343                 .procname       = "nf_conntrack_max",
344                 .data           = &nf_conntrack_max,
345                 .maxlen         = sizeof(int),
346                 .mode           = 0644,
347                 .proc_handler   = &proc_dointvec,
348         },
349         {
350                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
351                 .procname       = "nf_conntrack_count",
352                 .data           = &nf_conntrack_count,
353                 .maxlen         = sizeof(int),
354                 .mode           = 0444,
355                 .proc_handler   = &proc_dointvec,
356         },
357         {
358                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
359                 .procname       = "nf_conntrack_buckets",
360                 .data           = &nf_conntrack_htable_size,
361                 .maxlen         = sizeof(unsigned int),
362                 .mode           = 0444,
363                 .proc_handler   = &proc_dointvec,
364         },
365         {
366                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
367                 .procname       = "nf_conntrack_checksum",
368                 .data           = &nf_conntrack_checksum,
369                 .maxlen         = sizeof(unsigned int),
370                 .mode           = 0644,
371                 .proc_handler   = &proc_dointvec,
372         },
373         {
374                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
375                 .procname       = "nf_conntrack_log_invalid",
376                 .data           = &nf_ct_log_invalid,
377                 .maxlen         = sizeof(unsigned int),
378                 .mode           = 0644,
379                 .proc_handler   = &proc_dointvec_minmax,
380                 .strategy       = &sysctl_intvec,
381                 .extra1         = &log_invalid_proto_min,
382                 .extra2         = &log_invalid_proto_max,
383         },
384         {
385                 .ctl_name       = CTL_UNNUMBERED,
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         { .ctl_name = 0 }
393 };
394
395 #define NET_NF_CONNTRACK_MAX 2089
396
397 static ctl_table nf_ct_netfilter_table[] = {
398         {
399                 .ctl_name       = NET_NETFILTER,
400                 .procname       = "netfilter",
401                 .mode           = 0555,
402                 .child          = nf_ct_sysctl_table,
403         },
404         {
405                 .ctl_name       = NET_NF_CONNTRACK_MAX,
406                 .procname       = "nf_conntrack_max",
407                 .data           = &nf_conntrack_max,
408                 .maxlen         = sizeof(int),
409                 .mode           = 0644,
410                 .proc_handler   = &proc_dointvec,
411         },
412         { .ctl_name = 0 }
413 };
414
415 static struct ctl_path nf_ct_path[] = {
416         { .procname = "net", .ctl_name = CTL_NET, },
417         { }
418 };
419
420 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
421
422 static int nf_conntrack_standalone_init_sysctl(void)
423 {
424         nf_ct_sysctl_header =
425                 register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
426         if (nf_ct_sysctl_header == NULL) {
427                 printk("nf_conntrack: can't register to sysctl.\n");
428                 return -ENOMEM;
429         }
430         return 0;
431
432 }
433
434 static void nf_conntrack_standalone_fini_sysctl(void)
435 {
436         unregister_sysctl_table(nf_ct_sysctl_header);
437 }
438 #else
439 static int nf_conntrack_standalone_init_sysctl(void)
440 {
441         return 0;
442 }
443
444 static void nf_conntrack_standalone_fini_sysctl(void)
445 {
446 }
447 #endif /* CONFIG_SYSCTL */
448
449 static int __init nf_conntrack_standalone_init(void)
450 {
451         int ret;
452
453         ret = nf_conntrack_init();
454         if (ret < 0)
455                 goto out;
456         ret = nf_conntrack_standalone_init_proc();
457         if (ret < 0)
458                 goto out_proc;
459         ret = nf_conntrack_standalone_init_sysctl();
460         if (ret < 0)
461                 goto out_sysctl;
462         return 0;
463
464 out_sysctl:
465         nf_conntrack_standalone_fini_proc();
466 out_proc:
467         nf_conntrack_cleanup();
468 out:
469         return ret;
470 }
471
472 static void __exit nf_conntrack_standalone_fini(void)
473 {
474         nf_conntrack_standalone_fini_sysctl();
475         nf_conntrack_standalone_fini_proc();
476         nf_conntrack_cleanup();
477 }
478
479 module_init(nf_conntrack_standalone_init);
480 module_exit(nf_conntrack_standalone_fini);
481
482 /* Some modules need us, but don't depend directly on any symbol.
483    They should call this. */
484 void need_conntrack(void)
485 {
486 }
487 EXPORT_SYMBOL_GPL(need_conntrack);