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