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11#include <linux/types.h>
12#include <linux/proc_fs.h>
13#include <linux/seq_file.h>
14#include <linux/percpu.h>
15#include <linux/security.h>
16#include <net/net_namespace.h>
17
18#include <linux/netfilter.h>
19#include <net/netfilter/nf_conntrack_core.h>
20#include <net/netfilter/nf_conntrack_l3proto.h>
21#include <net/netfilter/nf_conntrack_l4proto.h>
22#include <net/netfilter/nf_conntrack_expect.h>
23#include <net/netfilter/nf_conntrack_acct.h>
24#include <linux/rculist_nulls.h>
25#include <linux/export.h>
26
27struct ct_iter_state {
28 struct seq_net_private p;
29 unsigned int bucket;
30};
31
32static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
33{
34 struct net *net = seq_file_net(seq);
35 struct ct_iter_state *st = seq->private;
36 struct hlist_nulls_node *n;
37
38 for (st->bucket = 0;
39 st->bucket < net->ct.htable_size;
40 st->bucket++) {
41 n = rcu_dereference(
42 hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
43 if (!is_a_nulls(n))
44 return n;
45 }
46 return NULL;
47}
48
49static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
50 struct hlist_nulls_node *head)
51{
52 struct net *net = seq_file_net(seq);
53 struct ct_iter_state *st = seq->private;
54
55 head = rcu_dereference(hlist_nulls_next_rcu(head));
56 while (is_a_nulls(head)) {
57 if (likely(get_nulls_value(head) == st->bucket)) {
58 if (++st->bucket >= net->ct.htable_size)
59 return NULL;
60 }
61 head = rcu_dereference(
62 hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
63 }
64 return head;
65}
66
67static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
68{
69 struct hlist_nulls_node *head = ct_get_first(seq);
70
71 if (head)
72 while (pos && (head = ct_get_next(seq, head)))
73 pos--;
74 return pos ? NULL : head;
75}
76
77static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
78 __acquires(RCU)
79{
80 rcu_read_lock();
81 return ct_get_idx(seq, *pos);
82}
83
84static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
85{
86 (*pos)++;
87 return ct_get_next(s, v);
88}
89
90static void ct_seq_stop(struct seq_file *s, void *v)
91 __releases(RCU)
92{
93 rcu_read_unlock();
94}
95
96#ifdef CONFIG_NF_CONNTRACK_SECMARK
97static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
98{
99 int ret;
100 u32 len;
101 char *secctx;
102
103 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
104 if (ret)
105 return;
106
107 seq_printf(s, "secctx=%s ", secctx);
108
109 security_release_secctx(secctx, len);
110}
111#else
112static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
113{
114}
115#endif
116
117static int ct_seq_show(struct seq_file *s, void *v)
118{
119 struct nf_conntrack_tuple_hash *hash = v;
120 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 int ret = 0;
124
125 NF_CT_ASSERT(ct);
126 if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
127 return 0;
128
129
130
131 if (NF_CT_DIRECTION(hash))
132 goto release;
133 if (nf_ct_l3num(ct) != AF_INET)
134 goto release;
135
136 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
137 NF_CT_ASSERT(l3proto);
138 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
139 NF_CT_ASSERT(l4proto);
140
141 ret = -ENOSPC;
142 seq_printf(s, "%-8s %u %ld ",
143 l4proto->name, nf_ct_protonum(ct),
144 timer_pending(&ct->timeout)
145 ? (long)(ct->timeout.expires - jiffies)/HZ : 0);
146
147 if (l4proto->print_conntrack)
148 l4proto->print_conntrack(s, ct);
149
150 if (seq_has_overflowed(s))
151 goto release;
152
153 print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
154 l3proto, l4proto);
155
156 if (seq_has_overflowed(s))
157 goto release;
158
159 if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
160 goto release;
161
162 if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
163 seq_printf(s, "[UNREPLIED] ");
164
165 print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
166 l3proto, l4proto);
167
168 if (seq_has_overflowed(s))
169 goto release;
170
171 if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
172 goto release;
173
174 if (test_bit(IPS_ASSURED_BIT, &ct->status))
175 seq_printf(s, "[ASSURED] ");
176
177#ifdef CONFIG_NF_CONNTRACK_MARK
178 seq_printf(s, "mark=%u ", ct->mark);
179#endif
180
181 ct_show_secctx(s, ct);
182
183 seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
184
185 if (seq_has_overflowed(s))
186 goto release;
187
188 ret = 0;
189release:
190 nf_ct_put(ct);
191 return ret;
192}
193
194static const struct seq_operations ct_seq_ops = {
195 .start = ct_seq_start,
196 .next = ct_seq_next,
197 .stop = ct_seq_stop,
198 .show = ct_seq_show
199};
200
201static int ct_open(struct inode *inode, struct file *file)
202{
203 return seq_open_net(inode, file, &ct_seq_ops,
204 sizeof(struct ct_iter_state));
205}
206
207static const struct file_operations ct_file_ops = {
208 .owner = THIS_MODULE,
209 .open = ct_open,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = seq_release_net,
213};
214
215
216struct ct_expect_iter_state {
217 struct seq_net_private p;
218 unsigned int bucket;
219};
220
221static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
222{
223 struct net *net = seq_file_net(seq);
224 struct ct_expect_iter_state *st = seq->private;
225 struct hlist_node *n;
226
227 for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
228 n = rcu_dereference(
229 hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
230 if (n)
231 return n;
232 }
233 return NULL;
234}
235
236static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
237 struct hlist_node *head)
238{
239 struct net *net = seq_file_net(seq);
240 struct ct_expect_iter_state *st = seq->private;
241
242 head = rcu_dereference(hlist_next_rcu(head));
243 while (head == NULL) {
244 if (++st->bucket >= nf_ct_expect_hsize)
245 return NULL;
246 head = rcu_dereference(
247 hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
248 }
249 return head;
250}
251
252static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
253{
254 struct hlist_node *head = ct_expect_get_first(seq);
255
256 if (head)
257 while (pos && (head = ct_expect_get_next(seq, head)))
258 pos--;
259 return pos ? NULL : head;
260}
261
262static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
263 __acquires(RCU)
264{
265 rcu_read_lock();
266 return ct_expect_get_idx(seq, *pos);
267}
268
269static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
270{
271 (*pos)++;
272 return ct_expect_get_next(seq, v);
273}
274
275static void exp_seq_stop(struct seq_file *seq, void *v)
276 __releases(RCU)
277{
278 rcu_read_unlock();
279}
280
281static int exp_seq_show(struct seq_file *s, void *v)
282{
283 struct nf_conntrack_expect *exp;
284 const struct hlist_node *n = v;
285
286 exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
287
288 if (exp->tuple.src.l3num != AF_INET)
289 return 0;
290
291 if (exp->timeout.function)
292 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
293 ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
294 else
295 seq_printf(s, "- ");
296
297 seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
298
299 print_tuple(s, &exp->tuple,
300 __nf_ct_l3proto_find(exp->tuple.src.l3num),
301 __nf_ct_l4proto_find(exp->tuple.src.l3num,
302 exp->tuple.dst.protonum));
303 seq_putc(s, '\n');
304
305 return 0;
306}
307
308static const struct seq_operations exp_seq_ops = {
309 .start = exp_seq_start,
310 .next = exp_seq_next,
311 .stop = exp_seq_stop,
312 .show = exp_seq_show
313};
314
315static int exp_open(struct inode *inode, struct file *file)
316{
317 return seq_open_net(inode, file, &exp_seq_ops,
318 sizeof(struct ct_expect_iter_state));
319}
320
321static const struct file_operations ip_exp_file_ops = {
322 .owner = THIS_MODULE,
323 .open = exp_open,
324 .read = seq_read,
325 .llseek = seq_lseek,
326 .release = seq_release_net,
327};
328
329static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
330{
331 struct net *net = seq_file_net(seq);
332 int cpu;
333
334 if (*pos == 0)
335 return SEQ_START_TOKEN;
336
337 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
338 if (!cpu_possible(cpu))
339 continue;
340 *pos = cpu+1;
341 return per_cpu_ptr(net->ct.stat, cpu);
342 }
343
344 return NULL;
345}
346
347static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
348{
349 struct net *net = seq_file_net(seq);
350 int cpu;
351
352 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
353 if (!cpu_possible(cpu))
354 continue;
355 *pos = cpu+1;
356 return per_cpu_ptr(net->ct.stat, cpu);
357 }
358
359 return NULL;
360}
361
362static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
363{
364}
365
366static int ct_cpu_seq_show(struct seq_file *seq, void *v)
367{
368 struct net *net = seq_file_net(seq);
369 unsigned int nr_conntracks = atomic_read(&net->ct.count);
370 const struct ip_conntrack_stat *st = v;
371
372 if (v == SEQ_START_TOKEN) {
373 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 search_restart\n");
374 return 0;
375 }
376
377 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
378 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
379 nr_conntracks,
380 st->searched,
381 st->found,
382 st->new,
383 st->invalid,
384 st->ignore,
385 st->delete,
386 st->delete_list,
387 st->insert,
388 st->insert_failed,
389 st->drop,
390 st->early_drop,
391 st->error,
392
393 st->expect_new,
394 st->expect_create,
395 st->expect_delete,
396 st->search_restart
397 );
398 return 0;
399}
400
401static const struct seq_operations ct_cpu_seq_ops = {
402 .start = ct_cpu_seq_start,
403 .next = ct_cpu_seq_next,
404 .stop = ct_cpu_seq_stop,
405 .show = ct_cpu_seq_show,
406};
407
408static int ct_cpu_seq_open(struct inode *inode, struct file *file)
409{
410 return seq_open_net(inode, file, &ct_cpu_seq_ops,
411 sizeof(struct seq_net_private));
412}
413
414static const struct file_operations ct_cpu_seq_fops = {
415 .owner = THIS_MODULE,
416 .open = ct_cpu_seq_open,
417 .read = seq_read,
418 .llseek = seq_lseek,
419 .release = seq_release_net,
420};
421
422static int __net_init ip_conntrack_net_init(struct net *net)
423{
424 struct proc_dir_entry *proc, *proc_exp, *proc_stat;
425
426 proc = proc_create("ip_conntrack", 0440, net->proc_net, &ct_file_ops);
427 if (!proc)
428 goto err1;
429
430 proc_exp = proc_create("ip_conntrack_expect", 0440, net->proc_net,
431 &ip_exp_file_ops);
432 if (!proc_exp)
433 goto err2;
434
435 proc_stat = proc_create("ip_conntrack", S_IRUGO,
436 net->proc_net_stat, &ct_cpu_seq_fops);
437 if (!proc_stat)
438 goto err3;
439 return 0;
440
441err3:
442 remove_proc_entry("ip_conntrack_expect", net->proc_net);
443err2:
444 remove_proc_entry("ip_conntrack", net->proc_net);
445err1:
446 return -ENOMEM;
447}
448
449static void __net_exit ip_conntrack_net_exit(struct net *net)
450{
451 remove_proc_entry("ip_conntrack", net->proc_net_stat);
452 remove_proc_entry("ip_conntrack_expect", net->proc_net);
453 remove_proc_entry("ip_conntrack", net->proc_net);
454}
455
456static struct pernet_operations ip_conntrack_net_ops = {
457 .init = ip_conntrack_net_init,
458 .exit = ip_conntrack_net_exit,
459};
460
461int __init nf_conntrack_ipv4_compat_init(void)
462{
463 return register_pernet_subsys(&ip_conntrack_net_ops);
464}
465
466void __exit nf_conntrack_ipv4_compat_fini(void)
467{
468 unregister_pernet_subsys(&ip_conntrack_net_ops);
469}
470
