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#ifdef CONFIG_SYSCTL
18#include <linux/sysctl.h>
19#endif
20
21#include <net/netfilter/nf_conntrack.h>
22#include <net/netfilter/nf_conntrack_core.h>
23#include <net/netfilter/nf_conntrack_l3proto.h>
24#include <net/netfilter/nf_conntrack_l4proto.h>
25#include <net/netfilter/nf_conntrack_expect.h>
26#include <net/netfilter/nf_conntrack_helper.h>
27
28#define DEBUGP(format, args...)
29
30MODULE_LICENSE("GPL");
31
32#ifdef CONFIG_PROC_FS
33int
34print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
35	    struct nf_conntrack_l3proto *l3proto,
36	    struct nf_conntrack_l4proto *l4proto)
37{
38	return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
39}
40EXPORT_SYMBOL_GPL(print_tuple);
41
42#ifdef CONFIG_NF_CT_ACCT
43static unsigned int
44seq_print_counters(struct seq_file *s,
45		   const struct ip_conntrack_counter *counter)
46{
47	return seq_printf(s, "packets=%llu bytes=%llu ",
48			  (unsigned long long)counter->packets,
49			  (unsigned long long)counter->bytes);
50}
51#else
52#define seq_print_counters(x, y)	0
53#endif
54
55struct ct_iter_state {
56	unsigned int bucket;
57};
58
59static struct list_head *ct_get_first(struct seq_file *seq)
60{
61	struct ct_iter_state *st = seq->private;
62
63	for (st->bucket = 0;
64	     st->bucket < nf_conntrack_htable_size;
65	     st->bucket++) {
66		if (!list_empty(&nf_conntrack_hash[st->bucket]))
67			return nf_conntrack_hash[st->bucket].next;
68	}
69	return NULL;
70}
71
72static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
73{
74	struct ct_iter_state *st = seq->private;
75
76	head = head->next;
77	while (head == &nf_conntrack_hash[st->bucket]) {
78		if (++st->bucket >= nf_conntrack_htable_size)
79			return NULL;
80		head = nf_conntrack_hash[st->bucket].next;
81	}
82	return head;
83}
84
85static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
86{
87	struct list_head *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
95static 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
101static 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
107static 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 */
113static 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
189static 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
196static int ct_open(struct inode *inode, struct file *file)
197{
198	struct seq_file *seq;
199	struct ct_iter_state *st;
200	int ret;
201
202	st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
203	if (st == NULL)
204		return -ENOMEM;
205	ret = seq_open(file, &ct_seq_ops);
206	if (ret)
207		goto out_free;
208	seq          = file->private_data;
209	seq->private = st;
210	memset(st, 0, sizeof(struct ct_iter_state));
211	return ret;
212out_free:
213	kfree(st);
214	return ret;
215}
216
217static const struct file_operations ct_file_ops = {
218	.owner   = THIS_MODULE,
219	.open    = ct_open,
220	.read    = seq_read,
221	.llseek  = seq_lseek,
222	.release = seq_release_private,
223};
224
225static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
226{
227	int cpu;
228
229	if (*pos == 0)
230		return SEQ_START_TOKEN;
231
232	for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
233		if (!cpu_possible(cpu))
234			continue;
235		*pos = cpu + 1;
236		return &per_cpu(nf_conntrack_stat, cpu);
237	}
238
239	return NULL;
240}
241
242static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
243{
244	int cpu;
245
246	for (cpu = *pos; 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
256static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
257{
258}
259
260static int ct_cpu_seq_show(struct seq_file *seq, void *v)
261{
262	unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
263	struct ip_conntrack_stat *st = v;
264
265	if (v == SEQ_START_TOKEN) {
266		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");
267		return 0;
268	}
269
270	seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
271			"%08x %08x %08x %08x %08x  %08x %08x %08x \n",
272		   nr_conntracks,
273		   st->searched,
274		   st->found,
275		   st->new,
276		   st->invalid,
277		   st->ignore,
278		   st->delete,
279		   st->delete_list,
280		   st->insert,
281		   st->insert_failed,
282		   st->drop,
283		   st->early_drop,
284		   st->error,
285
286		   st->expect_new,
287		   st->expect_create,
288		   st->expect_delete
289		);
290	return 0;
291}
292
293static struct seq_operations ct_cpu_seq_ops = {
294	.start	= ct_cpu_seq_start,
295	.next	= ct_cpu_seq_next,
296	.stop	= ct_cpu_seq_stop,
297	.show	= ct_cpu_seq_show,
298};
299
300static int ct_cpu_seq_open(struct inode *inode, struct file *file)
301{
302	return seq_open(file, &ct_cpu_seq_ops);
303}
304
305static const struct file_operations ct_cpu_seq_fops = {
306	.owner	 = THIS_MODULE,
307	.open	 = ct_cpu_seq_open,
308	.read	 = seq_read,
309	.llseek	 = seq_lseek,
310	.release = seq_release_private,
311};
312#endif /* CONFIG_PROC_FS */
313
314/* Sysctl support */
315
316int nf_conntrack_checksum __read_mostly = 1;
317EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
318
319#ifdef CONFIG_SYSCTL
320/* Log invalid packets of a given protocol */
321static int log_invalid_proto_min = 0;
322static int log_invalid_proto_max = 255;
323
324static struct ctl_table_header *nf_ct_sysctl_header;
325
326static ctl_table nf_ct_sysctl_table[] = {
327	{
328		.ctl_name	= NET_NF_CONNTRACK_MAX,
329		.procname	= "nf_conntrack_max",
330		.data		= &nf_conntrack_max,
331		.maxlen		= sizeof(int),
332		.mode		= 0644,
333		.proc_handler	= &proc_dointvec,
334	},
335	{
336		.ctl_name	= NET_NF_CONNTRACK_COUNT,
337		.procname	= "nf_conntrack_count",
338		.data		= &nf_conntrack_count,
339		.maxlen		= sizeof(int),
340		.mode		= 0444,
341		.proc_handler	= &proc_dointvec,
342	},
343	{
344		.ctl_name       = NET_NF_CONNTRACK_BUCKETS,
345		.procname       = "nf_conntrack_buckets",
346		.data           = &nf_conntrack_htable_size,
347		.maxlen         = sizeof(unsigned int),
348		.mode           = 0444,
349		.proc_handler   = &proc_dointvec,
350	},
351	{
352		.ctl_name	= NET_NF_CONNTRACK_CHECKSUM,
353		.procname	= "nf_conntrack_checksum",
354		.data		= &nf_conntrack_checksum,
355		.maxlen		= sizeof(unsigned int),
356		.mode		= 0644,
357		.proc_handler	= &proc_dointvec,
358	},
359	{
360		.ctl_name	= NET_NF_CONNTRACK_LOG_INVALID,
361		.procname	= "nf_conntrack_log_invalid",
362		.data		= &nf_ct_log_invalid,
363		.maxlen		= sizeof(unsigned int),
364		.mode		= 0644,
365		.proc_handler	= &proc_dointvec_minmax,
366		.strategy	= &sysctl_intvec,
367		.extra1		= &log_invalid_proto_min,
368		.extra2		= &log_invalid_proto_max,
369	},
370
371	{ .ctl_name = 0 }
372};
373
374#define NET_NF_CONNTRACK_MAX 2089
375
376static ctl_table nf_ct_netfilter_table[] = {
377	{
378		.ctl_name	= NET_NETFILTER,
379		.procname	= "netfilter",
380		.mode		= 0555,
381		.child		= nf_ct_sysctl_table,
382	},
383	{
384		.ctl_name	= NET_NF_CONNTRACK_MAX,
385		.procname	= "nf_conntrack_max",
386		.data		= &nf_conntrack_max,
387		.maxlen		= sizeof(int),
388		.mode		= 0644,
389		.proc_handler	= &proc_dointvec,
390	},
391	{ .ctl_name = 0 }
392};
393
394static ctl_table nf_ct_net_table[] = {
395	{
396		.ctl_name	= CTL_NET,
397		.procname	= "net",
398		.mode		= 0555,
399		.child		= nf_ct_netfilter_table,
400	},
401	{ .ctl_name = 0 }
402};
403EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
404#endif /* CONFIG_SYSCTL */
405
406static int __init nf_conntrack_standalone_init(void)
407{
408#ifdef CONFIG_PROC_FS
409	struct proc_dir_entry *proc, *proc_exp, *proc_stat;
410#endif
411	int ret = 0;
412
413	ret = nf_conntrack_init();
414	if (ret < 0)
415		return ret;
416
417#ifdef CONFIG_PROC_FS
418	proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
419	if (!proc) goto cleanup_init;
420
421	proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
422					&exp_file_ops);
423	if (!proc_exp) goto cleanup_proc;
424
425	proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
426	if (!proc_stat)
427		goto cleanup_proc_exp;
428
429	proc_stat->proc_fops = &ct_cpu_seq_fops;
430	proc_stat->owner = THIS_MODULE;
431#endif
432#ifdef CONFIG_SYSCTL
433	nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table);
434	if (nf_ct_sysctl_header == NULL) {
435		printk("nf_conntrack: can't register to sysctl.\n");
436		ret = -ENOMEM;
437		goto cleanup_proc_stat;
438	}
439#endif
440	return ret;
441
442#ifdef CONFIG_SYSCTL
443 cleanup_proc_stat:
444#endif
445#ifdef CONFIG_PROC_FS
446	remove_proc_entry("nf_conntrack", proc_net_stat);
447 cleanup_proc_exp:
448	proc_net_remove("nf_conntrack_expect");
449 cleanup_proc:
450	proc_net_remove("nf_conntrack");
451 cleanup_init:
452#endif /* CNFIG_PROC_FS */
453	nf_conntrack_cleanup();
454	return ret;
455}
456
457static void __exit nf_conntrack_standalone_fini(void)
458{
459#ifdef CONFIG_SYSCTL
460	unregister_sysctl_table(nf_ct_sysctl_header);
461#endif
462#ifdef CONFIG_PROC_FS
463	remove_proc_entry("nf_conntrack", proc_net_stat);
464	proc_net_remove("nf_conntrack_expect");
465	proc_net_remove("nf_conntrack");
466#endif /* CNFIG_PROC_FS */
467	nf_conntrack_cleanup();
468}
469
470module_init(nf_conntrack_standalone_init);
471module_exit(nf_conntrack_standalone_fini);
472
473/* Some modules need us, but don't depend directly on any symbol.
474   They should call this. */
475void need_conntrack(void)
476{
477}
478EXPORT_SYMBOL_GPL(need_conntrack);
479