[PATCH] mark struct file_operations const 7
[linux-2.6.git] / net / ipv4 / netfilter / nf_conntrack_l3proto_ipv4_compat.c
1 /* ip_conntrack proc compat - based on ip_conntrack_standalone.c
2  *
3  * (C) 1999-2001 Paul `Rusty' Russell
4  * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/types.h>
11 #include <linux/proc_fs.h>
12 #include <linux/seq_file.h>
13 #include <linux/percpu.h>
14
15 #include <linux/netfilter.h>
16 #include <net/netfilter/nf_conntrack_core.h>
17 #include <net/netfilter/nf_conntrack_l3proto.h>
18 #include <net/netfilter/nf_conntrack_l4proto.h>
19 #include <net/netfilter/nf_conntrack_expect.h>
20
21 #if 0
22 #define DEBUGP printk
23 #else
24 #define DEBUGP(format, args...)
25 #endif
26
27 #ifdef CONFIG_NF_CT_ACCT
28 static unsigned int
29 seq_print_counters(struct seq_file *s,
30                    const struct ip_conntrack_counter *counter)
31 {
32         return seq_printf(s, "packets=%llu bytes=%llu ",
33                           (unsigned long long)counter->packets,
34                           (unsigned long long)counter->bytes);
35 }
36 #else
37 #define seq_print_counters(x, y)        0
38 #endif
39
40 struct ct_iter_state {
41         unsigned int bucket;
42 };
43
44 static struct list_head *ct_get_first(struct seq_file *seq)
45 {
46         struct ct_iter_state *st = seq->private;
47
48         for (st->bucket = 0;
49              st->bucket < nf_conntrack_htable_size;
50              st->bucket++) {
51                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
52                         return nf_conntrack_hash[st->bucket].next;
53         }
54         return NULL;
55 }
56
57 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
58 {
59         struct ct_iter_state *st = seq->private;
60
61         head = head->next;
62         while (head == &nf_conntrack_hash[st->bucket]) {
63                 if (++st->bucket >= nf_conntrack_htable_size)
64                         return NULL;
65                 head = nf_conntrack_hash[st->bucket].next;
66         }
67         return head;
68 }
69
70 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
71 {
72         struct list_head *head = ct_get_first(seq);
73
74         if (head)
75                 while (pos && (head = ct_get_next(seq, head)))
76                         pos--;
77         return pos ? NULL : head;
78 }
79
80 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
81 {
82         read_lock_bh(&nf_conntrack_lock);
83         return ct_get_idx(seq, *pos);
84 }
85
86 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
87 {
88         (*pos)++;
89         return ct_get_next(s, v);
90 }
91
92 static void ct_seq_stop(struct seq_file *s, void *v)
93 {
94         read_unlock_bh(&nf_conntrack_lock);
95 }
96
97 static int ct_seq_show(struct seq_file *s, void *v)
98 {
99         const struct nf_conntrack_tuple_hash *hash = v;
100         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
101         struct nf_conntrack_l3proto *l3proto;
102         struct nf_conntrack_l4proto *l4proto;
103
104         NF_CT_ASSERT(ct);
105
106         /* we only want to print DIR_ORIGINAL */
107         if (NF_CT_DIRECTION(hash))
108                 return 0;
109         if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num != AF_INET)
110                 return 0;
111
112         l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
113                                        .tuple.src.l3num);
114         NF_CT_ASSERT(l3proto);
115         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
116                                        .tuple.src.l3num,
117                                        ct->tuplehash[IP_CT_DIR_ORIGINAL]
118                                        .tuple.dst.protonum);
119         NF_CT_ASSERT(l4proto);
120
121         if (seq_printf(s, "%-8s %u %ld ",
122                       l4proto->name,
123                       ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
124                       timer_pending(&ct->timeout)
125                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
126                 return -ENOSPC;
127
128         if (l3proto->print_conntrack(s, ct))
129                 return -ENOSPC;
130
131         if (l4proto->print_conntrack(s, ct))
132                 return -ENOSPC;
133
134         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
135                         l3proto, l4proto))
136                 return -ENOSPC;
137
138         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
139                 return -ENOSPC;
140
141         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
142                 if (seq_printf(s, "[UNREPLIED] "))
143                         return -ENOSPC;
144
145         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
146                         l3proto, l4proto))
147                 return -ENOSPC;
148
149         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
150                 return -ENOSPC;
151
152         if (test_bit(IPS_ASSURED_BIT, &ct->status))
153                 if (seq_printf(s, "[ASSURED] "))
154                         return -ENOSPC;
155
156 #ifdef CONFIG_NF_CONNTRACK_MARK
157         if (seq_printf(s, "mark=%u ", ct->mark))
158                 return -ENOSPC;
159 #endif
160
161 #ifdef CONFIG_NF_CONNTRACK_SECMARK
162         if (seq_printf(s, "secmark=%u ", ct->secmark))
163                 return -ENOSPC;
164 #endif
165
166         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
167                 return -ENOSPC;
168
169         return 0;
170 }
171
172 static struct seq_operations ct_seq_ops = {
173         .start = ct_seq_start,
174         .next  = ct_seq_next,
175         .stop  = ct_seq_stop,
176         .show  = ct_seq_show
177 };
178
179 static int ct_open(struct inode *inode, struct file *file)
180 {
181         struct seq_file *seq;
182         struct ct_iter_state *st;
183         int ret;
184
185         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
186         if (st == NULL)
187                 return -ENOMEM;
188         ret = seq_open(file, &ct_seq_ops);
189         if (ret)
190                 goto out_free;
191         seq          = file->private_data;
192         seq->private = st;
193         memset(st, 0, sizeof(struct ct_iter_state));
194         return ret;
195 out_free:
196         kfree(st);
197         return ret;
198 }
199
200 static const struct file_operations ct_file_ops = {
201         .owner   = THIS_MODULE,
202         .open    = ct_open,
203         .read    = seq_read,
204         .llseek  = seq_lseek,
205         .release = seq_release_private,
206 };
207
208 /* expects */
209 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
210 {
211         struct list_head *e = &nf_conntrack_expect_list;
212         loff_t i;
213
214         /* strange seq_file api calls stop even if we fail,
215          * thus we need to grab lock since stop unlocks */
216         read_lock_bh(&nf_conntrack_lock);
217
218         if (list_empty(e))
219                 return NULL;
220
221         for (i = 0; i <= *pos; i++) {
222                 e = e->next;
223                 if (e == &nf_conntrack_expect_list)
224                         return NULL;
225         }
226         return e;
227 }
228
229 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
230 {
231         struct list_head *e = v;
232
233         ++*pos;
234         e = e->next;
235
236         if (e == &nf_conntrack_expect_list)
237                 return NULL;
238
239         return e;
240 }
241
242 static void exp_seq_stop(struct seq_file *s, void *v)
243 {
244         read_unlock_bh(&nf_conntrack_lock);
245 }
246
247 static int exp_seq_show(struct seq_file *s, void *v)
248 {
249         struct nf_conntrack_expect *exp = v;
250
251         if (exp->tuple.src.l3num != AF_INET)
252                 return 0;
253
254         if (exp->timeout.function)
255                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
256                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
257         else
258                 seq_printf(s, "- ");
259
260         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
261
262         print_tuple(s, &exp->tuple,
263                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
264                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
265                                          exp->tuple.dst.protonum));
266         return seq_putc(s, '\n');
267 }
268
269 static struct seq_operations exp_seq_ops = {
270         .start = exp_seq_start,
271         .next = exp_seq_next,
272         .stop = exp_seq_stop,
273         .show = exp_seq_show
274 };
275
276 static int exp_open(struct inode *inode, struct file *file)
277 {
278         return seq_open(file, &exp_seq_ops);
279 }
280
281 static const struct file_operations ip_exp_file_ops = {
282         .owner   = THIS_MODULE,
283         .open    = exp_open,
284         .read    = seq_read,
285         .llseek  = seq_lseek,
286         .release = seq_release
287 };
288
289 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
290 {
291         int cpu;
292
293         if (*pos == 0)
294                 return SEQ_START_TOKEN;
295
296         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
297                 if (!cpu_possible(cpu))
298                         continue;
299                 *pos = cpu+1;
300                 return &per_cpu(nf_conntrack_stat, cpu);
301         }
302
303         return NULL;
304 }
305
306 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
307 {
308         int cpu;
309
310         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
311                 if (!cpu_possible(cpu))
312                         continue;
313                 *pos = cpu+1;
314                 return &per_cpu(nf_conntrack_stat, cpu);
315         }
316
317         return NULL;
318 }
319
320 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
321 {
322 }
323
324 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
325 {
326         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
327         struct ip_conntrack_stat *st = v;
328
329         if (v == SEQ_START_TOKEN) {
330                 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");
331                 return 0;
332         }
333
334         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
335                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
336                    nr_conntracks,
337                    st->searched,
338                    st->found,
339                    st->new,
340                    st->invalid,
341                    st->ignore,
342                    st->delete,
343                    st->delete_list,
344                    st->insert,
345                    st->insert_failed,
346                    st->drop,
347                    st->early_drop,
348                    st->error,
349
350                    st->expect_new,
351                    st->expect_create,
352                    st->expect_delete
353                 );
354         return 0;
355 }
356
357 static struct seq_operations ct_cpu_seq_ops = {
358         .start  = ct_cpu_seq_start,
359         .next   = ct_cpu_seq_next,
360         .stop   = ct_cpu_seq_stop,
361         .show   = ct_cpu_seq_show,
362 };
363
364 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
365 {
366         return seq_open(file, &ct_cpu_seq_ops);
367 }
368
369 static const struct file_operations ct_cpu_seq_fops = {
370         .owner   = THIS_MODULE,
371         .open    = ct_cpu_seq_open,
372         .read    = seq_read,
373         .llseek  = seq_lseek,
374         .release = seq_release_private,
375 };
376
377 int __init nf_conntrack_ipv4_compat_init(void)
378 {
379         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
380
381         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
382         if (!proc)
383                 goto err1;
384
385         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
386                                         &ip_exp_file_ops);
387         if (!proc_exp)
388                 goto err2;
389
390         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
391         if (!proc_stat)
392                 goto err3;
393
394         proc_stat->proc_fops = &ct_cpu_seq_fops;
395         proc_stat->owner = THIS_MODULE;
396
397         return 0;
398
399 err3:
400         proc_net_remove("ip_conntrack_expect");
401 err2:
402         proc_net_remove("ip_conntrack");
403 err1:
404         return -ENOMEM;
405 }
406
407 void __exit nf_conntrack_ipv4_compat_fini(void)
408 {
409         remove_proc_entry("ip_conntrack", proc_net_stat);
410         proc_net_remove("ip_conntrack_expect");
411         proc_net_remove("ip_conntrack");
412 }