Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* This file contains all the functions required for the standalone |
2 | ip_conntrack module. | |
3 | ||
4 | These are not required by the compatibility layer. | |
5 | */ | |
6 | ||
7 | /* (C) 1999-2001 Paul `Rusty' Russell | |
080774a2 | 8 | * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/types.h> |
16 | #include <linux/ip.h> | |
17 | #include <linux/netfilter.h> | |
18 | #include <linux/netfilter_ipv4.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/percpu.h> | |
24 | #ifdef CONFIG_SYSCTL | |
25 | #include <linux/sysctl.h> | |
26 | #endif | |
27 | #include <net/checksum.h> | |
28 | #include <net/ip.h> | |
14c85021 | 29 | #include <net/route.h> |
1da177e4 | 30 | |
e45b1be8 PM |
31 | #define ASSERT_READ_LOCK(x) |
32 | #define ASSERT_WRITE_LOCK(x) | |
1da177e4 LT |
33 | |
34 | #include <linux/netfilter_ipv4/ip_conntrack.h> | |
35 | #include <linux/netfilter_ipv4/ip_conntrack_protocol.h> | |
36 | #include <linux/netfilter_ipv4/ip_conntrack_core.h> | |
37 | #include <linux/netfilter_ipv4/ip_conntrack_helper.h> | |
38 | #include <linux/netfilter_ipv4/listhelp.h> | |
39 | ||
40 | #if 0 | |
41 | #define DEBUGP printk | |
42 | #else | |
43 | #define DEBUGP(format, args...) | |
44 | #endif | |
45 | ||
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | extern atomic_t ip_conntrack_count; | |
49 | DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat); | |
50 | ||
51 | static int kill_proto(struct ip_conntrack *i, void *data) | |
52 | { | |
53 | return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == | |
54 | *((u_int8_t *) data)); | |
55 | } | |
56 | ||
57 | #ifdef CONFIG_PROC_FS | |
58 | static int | |
59 | print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple, | |
60 | struct ip_conntrack_protocol *proto) | |
61 | { | |
62 | seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ", | |
63 | NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip)); | |
64 | return proto->print_tuple(s, tuple); | |
65 | } | |
66 | ||
67 | #ifdef CONFIG_IP_NF_CT_ACCT | |
68 | static unsigned int | |
69 | seq_print_counters(struct seq_file *s, | |
70 | const struct ip_conntrack_counter *counter) | |
71 | { | |
72 | return seq_printf(s, "packets=%llu bytes=%llu ", | |
73 | (unsigned long long)counter->packets, | |
74 | (unsigned long long)counter->bytes); | |
75 | } | |
76 | #else | |
77 | #define seq_print_counters(x, y) 0 | |
78 | #endif | |
79 | ||
80 | struct ct_iter_state { | |
81 | unsigned int bucket; | |
82 | }; | |
83 | ||
84 | static struct list_head *ct_get_first(struct seq_file *seq) | |
85 | { | |
86 | struct ct_iter_state *st = seq->private; | |
87 | ||
88 | for (st->bucket = 0; | |
89 | st->bucket < ip_conntrack_htable_size; | |
90 | st->bucket++) { | |
91 | if (!list_empty(&ip_conntrack_hash[st->bucket])) | |
92 | return ip_conntrack_hash[st->bucket].next; | |
93 | } | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head) | |
98 | { | |
99 | struct ct_iter_state *st = seq->private; | |
100 | ||
101 | head = head->next; | |
102 | while (head == &ip_conntrack_hash[st->bucket]) { | |
103 | if (++st->bucket >= ip_conntrack_htable_size) | |
104 | return NULL; | |
105 | head = ip_conntrack_hash[st->bucket].next; | |
106 | } | |
107 | return head; | |
108 | } | |
109 | ||
110 | static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos) | |
111 | { | |
112 | struct list_head *head = ct_get_first(seq); | |
113 | ||
114 | if (head) | |
115 | while (pos && (head = ct_get_next(seq, head))) | |
116 | pos--; | |
117 | return pos ? NULL : head; | |
118 | } | |
119 | ||
120 | static void *ct_seq_start(struct seq_file *seq, loff_t *pos) | |
121 | { | |
e45b1be8 | 122 | read_lock_bh(&ip_conntrack_lock); |
1da177e4 LT |
123 | return ct_get_idx(seq, *pos); |
124 | } | |
125 | ||
126 | static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
127 | { | |
128 | (*pos)++; | |
129 | return ct_get_next(s, v); | |
130 | } | |
131 | ||
132 | static void ct_seq_stop(struct seq_file *s, void *v) | |
133 | { | |
e45b1be8 | 134 | read_unlock_bh(&ip_conntrack_lock); |
1da177e4 LT |
135 | } |
136 | ||
137 | static int ct_seq_show(struct seq_file *s, void *v) | |
138 | { | |
139 | const struct ip_conntrack_tuple_hash *hash = v; | |
140 | const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash); | |
141 | struct ip_conntrack_protocol *proto; | |
142 | ||
e45b1be8 | 143 | ASSERT_READ_LOCK(&ip_conntrack_lock); |
1da177e4 LT |
144 | IP_NF_ASSERT(conntrack); |
145 | ||
146 | /* we only want to print DIR_ORIGINAL */ | |
147 | if (DIRECTION(hash)) | |
148 | return 0; | |
149 | ||
080774a2 | 150 | proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
1da177e4 LT |
151 | IP_NF_ASSERT(proto); |
152 | ||
153 | if (seq_printf(s, "%-8s %u %ld ", | |
154 | proto->name, | |
155 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum, | |
156 | timer_pending(&conntrack->timeout) | |
157 | ? (long)(conntrack->timeout.expires - jiffies)/HZ | |
158 | : 0) != 0) | |
159 | return -ENOSPC; | |
160 | ||
161 | if (proto->print_conntrack(s, conntrack)) | |
162 | return -ENOSPC; | |
163 | ||
164 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
165 | proto)) | |
166 | return -ENOSPC; | |
167 | ||
168 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL])) | |
169 | return -ENOSPC; | |
170 | ||
171 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status))) | |
172 | if (seq_printf(s, "[UNREPLIED] ")) | |
173 | return -ENOSPC; | |
174 | ||
175 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple, | |
176 | proto)) | |
177 | return -ENOSPC; | |
178 | ||
179 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY])) | |
180 | return -ENOSPC; | |
181 | ||
182 | if (test_bit(IPS_ASSURED_BIT, &conntrack->status)) | |
183 | if (seq_printf(s, "[ASSURED] ")) | |
184 | return -ENOSPC; | |
185 | ||
186 | #if defined(CONFIG_IP_NF_CONNTRACK_MARK) | |
bf3a46aa | 187 | if (seq_printf(s, "mark=%u ", conntrack->mark)) |
1da177e4 LT |
188 | return -ENOSPC; |
189 | #endif | |
190 | ||
7c9728c3 JM |
191 | #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK |
192 | if (seq_printf(s, "secmark=%u ", conntrack->secmark)) | |
193 | return -ENOSPC; | |
194 | #endif | |
195 | ||
1da177e4 LT |
196 | if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) |
197 | return -ENOSPC; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static struct seq_operations ct_seq_ops = { | |
203 | .start = ct_seq_start, | |
204 | .next = ct_seq_next, | |
205 | .stop = ct_seq_stop, | |
206 | .show = ct_seq_show | |
207 | }; | |
208 | ||
209 | static int ct_open(struct inode *inode, struct file *file) | |
210 | { | |
211 | struct seq_file *seq; | |
212 | struct ct_iter_state *st; | |
213 | int ret; | |
214 | ||
215 | st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL); | |
216 | if (st == NULL) | |
217 | return -ENOMEM; | |
218 | ret = seq_open(file, &ct_seq_ops); | |
219 | if (ret) | |
220 | goto out_free; | |
221 | seq = file->private_data; | |
222 | seq->private = st; | |
223 | memset(st, 0, sizeof(struct ct_iter_state)); | |
224 | return ret; | |
225 | out_free: | |
226 | kfree(st); | |
227 | return ret; | |
228 | } | |
229 | ||
230 | static struct file_operations ct_file_ops = { | |
231 | .owner = THIS_MODULE, | |
232 | .open = ct_open, | |
233 | .read = seq_read, | |
234 | .llseek = seq_lseek, | |
235 | .release = seq_release_private, | |
236 | }; | |
237 | ||
238 | /* expects */ | |
239 | static void *exp_seq_start(struct seq_file *s, loff_t *pos) | |
240 | { | |
241 | struct list_head *e = &ip_conntrack_expect_list; | |
242 | loff_t i; | |
243 | ||
244 | /* strange seq_file api calls stop even if we fail, | |
245 | * thus we need to grab lock since stop unlocks */ | |
e45b1be8 | 246 | read_lock_bh(&ip_conntrack_lock); |
1da177e4 LT |
247 | |
248 | if (list_empty(e)) | |
249 | return NULL; | |
250 | ||
251 | for (i = 0; i <= *pos; i++) { | |
252 | e = e->next; | |
253 | if (e == &ip_conntrack_expect_list) | |
254 | return NULL; | |
255 | } | |
256 | return e; | |
257 | } | |
258 | ||
259 | static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
260 | { | |
261 | struct list_head *e = v; | |
262 | ||
a96aca88 | 263 | ++*pos; |
1da177e4 LT |
264 | e = e->next; |
265 | ||
266 | if (e == &ip_conntrack_expect_list) | |
267 | return NULL; | |
268 | ||
269 | return e; | |
270 | } | |
271 | ||
272 | static void exp_seq_stop(struct seq_file *s, void *v) | |
273 | { | |
e45b1be8 | 274 | read_unlock_bh(&ip_conntrack_lock); |
1da177e4 LT |
275 | } |
276 | ||
277 | static int exp_seq_show(struct seq_file *s, void *v) | |
278 | { | |
279 | struct ip_conntrack_expect *expect = v; | |
280 | ||
281 | if (expect->timeout.function) | |
282 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
283 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
284 | else | |
285 | seq_printf(s, "- "); | |
286 | ||
287 | seq_printf(s, "proto=%u ", expect->tuple.dst.protonum); | |
288 | ||
289 | print_tuple(s, &expect->tuple, | |
080774a2 | 290 | __ip_conntrack_proto_find(expect->tuple.dst.protonum)); |
1da177e4 LT |
291 | return seq_putc(s, '\n'); |
292 | } | |
293 | ||
294 | static struct seq_operations exp_seq_ops = { | |
295 | .start = exp_seq_start, | |
296 | .next = exp_seq_next, | |
297 | .stop = exp_seq_stop, | |
298 | .show = exp_seq_show | |
299 | }; | |
300 | ||
301 | static int exp_open(struct inode *inode, struct file *file) | |
302 | { | |
303 | return seq_open(file, &exp_seq_ops); | |
304 | } | |
305 | ||
306 | static struct file_operations exp_file_ops = { | |
307 | .owner = THIS_MODULE, | |
308 | .open = exp_open, | |
309 | .read = seq_read, | |
310 | .llseek = seq_lseek, | |
311 | .release = seq_release | |
312 | }; | |
313 | ||
314 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
315 | { | |
316 | int cpu; | |
317 | ||
318 | if (*pos == 0) | |
319 | return SEQ_START_TOKEN; | |
320 | ||
321 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
322 | if (!cpu_possible(cpu)) | |
323 | continue; | |
324 | *pos = cpu+1; | |
325 | return &per_cpu(ip_conntrack_stat, cpu); | |
326 | } | |
327 | ||
328 | return NULL; | |
329 | } | |
330 | ||
331 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
332 | { | |
333 | int cpu; | |
334 | ||
335 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
336 | if (!cpu_possible(cpu)) | |
337 | continue; | |
338 | *pos = cpu+1; | |
339 | return &per_cpu(ip_conntrack_stat, cpu); | |
340 | } | |
341 | ||
342 | return NULL; | |
343 | } | |
344 | ||
345 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) | |
346 | { | |
347 | } | |
348 | ||
349 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) | |
350 | { | |
351 | unsigned int nr_conntracks = atomic_read(&ip_conntrack_count); | |
352 | struct ip_conntrack_stat *st = v; | |
353 | ||
354 | if (v == SEQ_START_TOKEN) { | |
355 | 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"); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " | |
360 | "%08x %08x %08x %08x %08x %08x %08x %08x \n", | |
361 | nr_conntracks, | |
362 | st->searched, | |
363 | st->found, | |
364 | st->new, | |
365 | st->invalid, | |
366 | st->ignore, | |
367 | st->delete, | |
368 | st->delete_list, | |
369 | st->insert, | |
370 | st->insert_failed, | |
371 | st->drop, | |
372 | st->early_drop, | |
373 | st->error, | |
374 | ||
375 | st->expect_new, | |
376 | st->expect_create, | |
377 | st->expect_delete | |
378 | ); | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static struct seq_operations ct_cpu_seq_ops = { | |
383 | .start = ct_cpu_seq_start, | |
384 | .next = ct_cpu_seq_next, | |
385 | .stop = ct_cpu_seq_stop, | |
386 | .show = ct_cpu_seq_show, | |
387 | }; | |
388 | ||
389 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) | |
390 | { | |
391 | return seq_open(file, &ct_cpu_seq_ops); | |
392 | } | |
393 | ||
394 | static struct file_operations ct_cpu_seq_fops = { | |
395 | .owner = THIS_MODULE, | |
396 | .open = ct_cpu_seq_open, | |
397 | .read = seq_read, | |
398 | .llseek = seq_lseek, | |
399 | .release = seq_release_private, | |
400 | }; | |
401 | #endif | |
402 | ||
403 | static unsigned int ip_confirm(unsigned int hooknum, | |
404 | struct sk_buff **pskb, | |
405 | const struct net_device *in, | |
406 | const struct net_device *out, | |
407 | int (*okfn)(struct sk_buff *)) | |
e281e3ac PM |
408 | { |
409 | /* We've seen it coming out the other side: confirm it */ | |
410 | return ip_conntrack_confirm(pskb); | |
411 | } | |
412 | ||
413 | static unsigned int ip_conntrack_help(unsigned int hooknum, | |
414 | struct sk_buff **pskb, | |
415 | const struct net_device *in, | |
416 | const struct net_device *out, | |
417 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
418 | { |
419 | struct ip_conntrack *ct; | |
420 | enum ip_conntrack_info ctinfo; | |
421 | ||
422 | /* This is where we call the helper: as the packet goes out. */ | |
423 | ct = ip_conntrack_get(*pskb, &ctinfo); | |
6442f1cf | 424 | if (ct && ct->helper && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) { |
1da177e4 LT |
425 | unsigned int ret; |
426 | ret = ct->helper->help(pskb, ct, ctinfo); | |
427 | if (ret != NF_ACCEPT) | |
428 | return ret; | |
429 | } | |
e281e3ac | 430 | return NF_ACCEPT; |
1da177e4 LT |
431 | } |
432 | ||
433 | static unsigned int ip_conntrack_defrag(unsigned int hooknum, | |
434 | struct sk_buff **pskb, | |
435 | const struct net_device *in, | |
436 | const struct net_device *out, | |
437 | int (*okfn)(struct sk_buff *)) | |
438 | { | |
84531c24 PO |
439 | #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE) |
440 | /* Previously seen (loopback)? Ignore. Do this before | |
441 | fragment check. */ | |
442 | if ((*pskb)->nfct) | |
443 | return NF_ACCEPT; | |
444 | #endif | |
445 | ||
1da177e4 LT |
446 | /* Gather fragments. */ |
447 | if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) { | |
448 | *pskb = ip_ct_gather_frags(*pskb, | |
449 | hooknum == NF_IP_PRE_ROUTING ? | |
450 | IP_DEFRAG_CONNTRACK_IN : | |
451 | IP_DEFRAG_CONNTRACK_OUT); | |
452 | if (!*pskb) | |
453 | return NF_STOLEN; | |
454 | } | |
455 | return NF_ACCEPT; | |
456 | } | |
457 | ||
1da177e4 LT |
458 | static unsigned int ip_conntrack_local(unsigned int hooknum, |
459 | struct sk_buff **pskb, | |
460 | const struct net_device *in, | |
461 | const struct net_device *out, | |
462 | int (*okfn)(struct sk_buff *)) | |
463 | { | |
464 | /* root is playing with raw sockets. */ | |
465 | if ((*pskb)->len < sizeof(struct iphdr) | |
466 | || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) { | |
467 | if (net_ratelimit()) | |
468 | printk("ipt_hook: happy cracking.\n"); | |
469 | return NF_ACCEPT; | |
470 | } | |
471 | return ip_conntrack_in(hooknum, pskb, in, out, okfn); | |
472 | } | |
473 | ||
474 | /* Connection tracking may drop packets, but never alters them, so | |
475 | make it the first hook. */ | |
964ddaa1 PM |
476 | static struct nf_hook_ops ip_conntrack_ops[] = { |
477 | { | |
478 | .hook = ip_conntrack_defrag, | |
479 | .owner = THIS_MODULE, | |
480 | .pf = PF_INET, | |
481 | .hooknum = NF_IP_PRE_ROUTING, | |
482 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
483 | }, | |
484 | { | |
485 | .hook = ip_conntrack_in, | |
486 | .owner = THIS_MODULE, | |
487 | .pf = PF_INET, | |
488 | .hooknum = NF_IP_PRE_ROUTING, | |
489 | .priority = NF_IP_PRI_CONNTRACK, | |
490 | }, | |
491 | { | |
492 | .hook = ip_conntrack_defrag, | |
493 | .owner = THIS_MODULE, | |
494 | .pf = PF_INET, | |
495 | .hooknum = NF_IP_LOCAL_OUT, | |
496 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
497 | }, | |
498 | { | |
499 | .hook = ip_conntrack_local, | |
500 | .owner = THIS_MODULE, | |
501 | .pf = PF_INET, | |
502 | .hooknum = NF_IP_LOCAL_OUT, | |
503 | .priority = NF_IP_PRI_CONNTRACK, | |
504 | }, | |
505 | { | |
506 | .hook = ip_conntrack_help, | |
507 | .owner = THIS_MODULE, | |
508 | .pf = PF_INET, | |
509 | .hooknum = NF_IP_POST_ROUTING, | |
510 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
511 | }, | |
512 | { | |
513 | .hook = ip_conntrack_help, | |
514 | .owner = THIS_MODULE, | |
515 | .pf = PF_INET, | |
516 | .hooknum = NF_IP_LOCAL_IN, | |
517 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
518 | }, | |
519 | { | |
520 | .hook = ip_confirm, | |
521 | .owner = THIS_MODULE, | |
522 | .pf = PF_INET, | |
523 | .hooknum = NF_IP_POST_ROUTING, | |
524 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, | |
525 | }, | |
526 | { | |
527 | .hook = ip_confirm, | |
528 | .owner = THIS_MODULE, | |
529 | .pf = PF_INET, | |
530 | .hooknum = NF_IP_LOCAL_IN, | |
531 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, | |
532 | }, | |
1da177e4 LT |
533 | }; |
534 | ||
535 | /* Sysctl support */ | |
536 | ||
94aec08e | 537 | int ip_conntrack_checksum __read_mostly = 1; |
72b55823 | 538 | |
1da177e4 LT |
539 | #ifdef CONFIG_SYSCTL |
540 | ||
541 | /* From ip_conntrack_core.c */ | |
542 | extern int ip_conntrack_max; | |
543 | extern unsigned int ip_conntrack_htable_size; | |
544 | ||
545 | /* From ip_conntrack_proto_tcp.c */ | |
babbdb1a PM |
546 | extern unsigned int ip_ct_tcp_timeout_syn_sent; |
547 | extern unsigned int ip_ct_tcp_timeout_syn_recv; | |
548 | extern unsigned int ip_ct_tcp_timeout_established; | |
549 | extern unsigned int ip_ct_tcp_timeout_fin_wait; | |
550 | extern unsigned int ip_ct_tcp_timeout_close_wait; | |
551 | extern unsigned int ip_ct_tcp_timeout_last_ack; | |
552 | extern unsigned int ip_ct_tcp_timeout_time_wait; | |
553 | extern unsigned int ip_ct_tcp_timeout_close; | |
554 | extern unsigned int ip_ct_tcp_timeout_max_retrans; | |
1da177e4 LT |
555 | extern int ip_ct_tcp_loose; |
556 | extern int ip_ct_tcp_be_liberal; | |
557 | extern int ip_ct_tcp_max_retrans; | |
558 | ||
559 | /* From ip_conntrack_proto_udp.c */ | |
babbdb1a PM |
560 | extern unsigned int ip_ct_udp_timeout; |
561 | extern unsigned int ip_ct_udp_timeout_stream; | |
1da177e4 LT |
562 | |
563 | /* From ip_conntrack_proto_icmp.c */ | |
babbdb1a | 564 | extern unsigned int ip_ct_icmp_timeout; |
1da177e4 | 565 | |
94aec08e | 566 | /* From ip_conntrack_proto_generic.c */ |
babbdb1a | 567 | extern unsigned int ip_ct_generic_timeout; |
1da177e4 LT |
568 | |
569 | /* Log invalid packets of a given protocol */ | |
570 | static int log_invalid_proto_min = 0; | |
571 | static int log_invalid_proto_max = 255; | |
572 | ||
573 | static struct ctl_table_header *ip_ct_sysctl_header; | |
574 | ||
575 | static ctl_table ip_ct_sysctl_table[] = { | |
576 | { | |
577 | .ctl_name = NET_IPV4_NF_CONNTRACK_MAX, | |
578 | .procname = "ip_conntrack_max", | |
579 | .data = &ip_conntrack_max, | |
580 | .maxlen = sizeof(int), | |
581 | .mode = 0644, | |
582 | .proc_handler = &proc_dointvec, | |
583 | }, | |
584 | { | |
585 | .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT, | |
586 | .procname = "ip_conntrack_count", | |
587 | .data = &ip_conntrack_count, | |
588 | .maxlen = sizeof(int), | |
589 | .mode = 0444, | |
590 | .proc_handler = &proc_dointvec, | |
591 | }, | |
592 | { | |
593 | .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS, | |
594 | .procname = "ip_conntrack_buckets", | |
595 | .data = &ip_conntrack_htable_size, | |
596 | .maxlen = sizeof(unsigned int), | |
597 | .mode = 0444, | |
598 | .proc_handler = &proc_dointvec, | |
599 | }, | |
39a27a35 PM |
600 | { |
601 | .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM, | |
602 | .procname = "ip_conntrack_checksum", | |
603 | .data = &ip_conntrack_checksum, | |
604 | .maxlen = sizeof(int), | |
605 | .mode = 0644, | |
606 | .proc_handler = &proc_dointvec, | |
607 | }, | |
1da177e4 LT |
608 | { |
609 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
610 | .procname = "ip_conntrack_tcp_timeout_syn_sent", | |
611 | .data = &ip_ct_tcp_timeout_syn_sent, | |
612 | .maxlen = sizeof(unsigned int), | |
613 | .mode = 0644, | |
614 | .proc_handler = &proc_dointvec_jiffies, | |
615 | }, | |
616 | { | |
617 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
618 | .procname = "ip_conntrack_tcp_timeout_syn_recv", | |
619 | .data = &ip_ct_tcp_timeout_syn_recv, | |
620 | .maxlen = sizeof(unsigned int), | |
621 | .mode = 0644, | |
622 | .proc_handler = &proc_dointvec_jiffies, | |
623 | }, | |
624 | { | |
625 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
626 | .procname = "ip_conntrack_tcp_timeout_established", | |
627 | .data = &ip_ct_tcp_timeout_established, | |
628 | .maxlen = sizeof(unsigned int), | |
629 | .mode = 0644, | |
630 | .proc_handler = &proc_dointvec_jiffies, | |
631 | }, | |
632 | { | |
633 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
634 | .procname = "ip_conntrack_tcp_timeout_fin_wait", | |
635 | .data = &ip_ct_tcp_timeout_fin_wait, | |
636 | .maxlen = sizeof(unsigned int), | |
637 | .mode = 0644, | |
638 | .proc_handler = &proc_dointvec_jiffies, | |
639 | }, | |
640 | { | |
641 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
642 | .procname = "ip_conntrack_tcp_timeout_close_wait", | |
643 | .data = &ip_ct_tcp_timeout_close_wait, | |
644 | .maxlen = sizeof(unsigned int), | |
645 | .mode = 0644, | |
646 | .proc_handler = &proc_dointvec_jiffies, | |
647 | }, | |
648 | { | |
649 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
650 | .procname = "ip_conntrack_tcp_timeout_last_ack", | |
651 | .data = &ip_ct_tcp_timeout_last_ack, | |
652 | .maxlen = sizeof(unsigned int), | |
653 | .mode = 0644, | |
654 | .proc_handler = &proc_dointvec_jiffies, | |
655 | }, | |
656 | { | |
657 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
658 | .procname = "ip_conntrack_tcp_timeout_time_wait", | |
659 | .data = &ip_ct_tcp_timeout_time_wait, | |
660 | .maxlen = sizeof(unsigned int), | |
661 | .mode = 0644, | |
662 | .proc_handler = &proc_dointvec_jiffies, | |
663 | }, | |
664 | { | |
665 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
666 | .procname = "ip_conntrack_tcp_timeout_close", | |
667 | .data = &ip_ct_tcp_timeout_close, | |
668 | .maxlen = sizeof(unsigned int), | |
669 | .mode = 0644, | |
670 | .proc_handler = &proc_dointvec_jiffies, | |
671 | }, | |
672 | { | |
673 | .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT, | |
674 | .procname = "ip_conntrack_udp_timeout", | |
675 | .data = &ip_ct_udp_timeout, | |
676 | .maxlen = sizeof(unsigned int), | |
677 | .mode = 0644, | |
678 | .proc_handler = &proc_dointvec_jiffies, | |
679 | }, | |
680 | { | |
681 | .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM, | |
682 | .procname = "ip_conntrack_udp_timeout_stream", | |
683 | .data = &ip_ct_udp_timeout_stream, | |
684 | .maxlen = sizeof(unsigned int), | |
685 | .mode = 0644, | |
686 | .proc_handler = &proc_dointvec_jiffies, | |
687 | }, | |
688 | { | |
689 | .ctl_name = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT, | |
690 | .procname = "ip_conntrack_icmp_timeout", | |
691 | .data = &ip_ct_icmp_timeout, | |
692 | .maxlen = sizeof(unsigned int), | |
693 | .mode = 0644, | |
694 | .proc_handler = &proc_dointvec_jiffies, | |
695 | }, | |
696 | { | |
697 | .ctl_name = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT, | |
698 | .procname = "ip_conntrack_generic_timeout", | |
699 | .data = &ip_ct_generic_timeout, | |
700 | .maxlen = sizeof(unsigned int), | |
701 | .mode = 0644, | |
702 | .proc_handler = &proc_dointvec_jiffies, | |
703 | }, | |
704 | { | |
705 | .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID, | |
706 | .procname = "ip_conntrack_log_invalid", | |
707 | .data = &ip_ct_log_invalid, | |
708 | .maxlen = sizeof(unsigned int), | |
709 | .mode = 0644, | |
710 | .proc_handler = &proc_dointvec_minmax, | |
711 | .strategy = &sysctl_intvec, | |
712 | .extra1 = &log_invalid_proto_min, | |
713 | .extra2 = &log_invalid_proto_max, | |
714 | }, | |
715 | { | |
716 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
717 | .procname = "ip_conntrack_tcp_timeout_max_retrans", | |
718 | .data = &ip_ct_tcp_timeout_max_retrans, | |
719 | .maxlen = sizeof(unsigned int), | |
720 | .mode = 0644, | |
721 | .proc_handler = &proc_dointvec_jiffies, | |
722 | }, | |
723 | { | |
724 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
725 | .procname = "ip_conntrack_tcp_loose", | |
726 | .data = &ip_ct_tcp_loose, | |
727 | .maxlen = sizeof(unsigned int), | |
728 | .mode = 0644, | |
729 | .proc_handler = &proc_dointvec, | |
730 | }, | |
731 | { | |
732 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
733 | .procname = "ip_conntrack_tcp_be_liberal", | |
734 | .data = &ip_ct_tcp_be_liberal, | |
735 | .maxlen = sizeof(unsigned int), | |
736 | .mode = 0644, | |
737 | .proc_handler = &proc_dointvec, | |
738 | }, | |
739 | { | |
740 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
741 | .procname = "ip_conntrack_tcp_max_retrans", | |
742 | .data = &ip_ct_tcp_max_retrans, | |
743 | .maxlen = sizeof(unsigned int), | |
744 | .mode = 0644, | |
745 | .proc_handler = &proc_dointvec, | |
746 | }, | |
747 | { .ctl_name = 0 } | |
748 | }; | |
749 | ||
750 | #define NET_IP_CONNTRACK_MAX 2089 | |
751 | ||
752 | static ctl_table ip_ct_netfilter_table[] = { | |
753 | { | |
754 | .ctl_name = NET_IPV4_NETFILTER, | |
755 | .procname = "netfilter", | |
756 | .mode = 0555, | |
757 | .child = ip_ct_sysctl_table, | |
758 | }, | |
759 | { | |
760 | .ctl_name = NET_IP_CONNTRACK_MAX, | |
761 | .procname = "ip_conntrack_max", | |
762 | .data = &ip_conntrack_max, | |
763 | .maxlen = sizeof(int), | |
764 | .mode = 0644, | |
765 | .proc_handler = &proc_dointvec | |
766 | }, | |
767 | { .ctl_name = 0 } | |
768 | }; | |
769 | ||
770 | static ctl_table ip_ct_ipv4_table[] = { | |
771 | { | |
772 | .ctl_name = NET_IPV4, | |
773 | .procname = "ipv4", | |
774 | .mode = 0555, | |
775 | .child = ip_ct_netfilter_table, | |
776 | }, | |
777 | { .ctl_name = 0 } | |
778 | }; | |
779 | ||
780 | static ctl_table ip_ct_net_table[] = { | |
781 | { | |
782 | .ctl_name = CTL_NET, | |
783 | .procname = "net", | |
784 | .mode = 0555, | |
785 | .child = ip_ct_ipv4_table, | |
786 | }, | |
787 | { .ctl_name = 0 } | |
788 | }; | |
789 | ||
790 | EXPORT_SYMBOL(ip_ct_log_invalid); | |
791 | #endif /* CONFIG_SYSCTL */ | |
792 | ||
32292a7f PM |
793 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
794 | them. --RR */ | |
795 | int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto) | |
796 | { | |
797 | int ret = 0; | |
798 | ||
799 | write_lock_bh(&ip_conntrack_lock); | |
800 | if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) { | |
801 | ret = -EBUSY; | |
802 | goto out; | |
803 | } | |
804 | ip_ct_protos[proto->proto] = proto; | |
805 | out: | |
806 | write_unlock_bh(&ip_conntrack_lock); | |
807 | return ret; | |
808 | } | |
809 | ||
810 | void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto) | |
811 | { | |
812 | write_lock_bh(&ip_conntrack_lock); | |
813 | ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol; | |
814 | write_unlock_bh(&ip_conntrack_lock); | |
815 | ||
816 | /* Somebody could be still looking at the proto in bh. */ | |
817 | synchronize_net(); | |
818 | ||
819 | /* Remove all contrack entries for this protocol */ | |
820 | ip_ct_iterate_cleanup(kill_proto, &proto->proto); | |
821 | } | |
822 | ||
823 | static int __init ip_conntrack_standalone_init(void) | |
1da177e4 LT |
824 | { |
825 | #ifdef CONFIG_PROC_FS | |
826 | struct proc_dir_entry *proc, *proc_exp, *proc_stat; | |
827 | #endif | |
828 | int ret = 0; | |
829 | ||
1da177e4 LT |
830 | ret = ip_conntrack_init(); |
831 | if (ret < 0) | |
32292a7f | 832 | return ret; |
1da177e4 LT |
833 | |
834 | #ifdef CONFIG_PROC_FS | |
835 | ret = -ENOMEM; | |
836 | proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops); | |
837 | if (!proc) goto cleanup_init; | |
838 | ||
839 | proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440, | |
840 | &exp_file_ops); | |
841 | if (!proc_exp) goto cleanup_proc; | |
842 | ||
843 | proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat); | |
844 | if (!proc_stat) | |
845 | goto cleanup_proc_exp; | |
846 | ||
847 | proc_stat->proc_fops = &ct_cpu_seq_fops; | |
848 | proc_stat->owner = THIS_MODULE; | |
849 | #endif | |
850 | ||
964ddaa1 | 851 | ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops)); |
1da177e4 | 852 | if (ret < 0) { |
964ddaa1 | 853 | printk("ip_conntrack: can't register hooks.\n"); |
1da177e4 LT |
854 | goto cleanup_proc_stat; |
855 | } | |
1da177e4 LT |
856 | #ifdef CONFIG_SYSCTL |
857 | ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0); | |
858 | if (ip_ct_sysctl_header == NULL) { | |
859 | printk("ip_conntrack: can't register to sysctl.\n"); | |
860 | ret = -ENOMEM; | |
964ddaa1 | 861 | goto cleanup_hooks; |
1da177e4 LT |
862 | } |
863 | #endif | |
1da177e4 LT |
864 | return ret; |
865 | ||
1da177e4 | 866 | #ifdef CONFIG_SYSCTL |
964ddaa1 | 867 | cleanup_hooks: |
964ddaa1 | 868 | nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops)); |
32292a7f | 869 | #endif |
1da177e4 LT |
870 | cleanup_proc_stat: |
871 | #ifdef CONFIG_PROC_FS | |
872 | remove_proc_entry("ip_conntrack", proc_net_stat); | |
873 | cleanup_proc_exp: | |
874 | proc_net_remove("ip_conntrack_expect"); | |
875 | cleanup_proc: | |
876 | proc_net_remove("ip_conntrack"); | |
877 | cleanup_init: | |
878 | #endif /* CONFIG_PROC_FS */ | |
879 | ip_conntrack_cleanup(); | |
1da177e4 LT |
880 | return ret; |
881 | } | |
882 | ||
65b4b4e8 | 883 | static void __exit ip_conntrack_standalone_fini(void) |
1da177e4 | 884 | { |
32292a7f PM |
885 | synchronize_net(); |
886 | #ifdef CONFIG_SYSCTL | |
887 | unregister_sysctl_table(ip_ct_sysctl_header); | |
888 | #endif | |
889 | nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops)); | |
890 | #ifdef CONFIG_PROC_FS | |
891 | remove_proc_entry("ip_conntrack", proc_net_stat); | |
892 | proc_net_remove("ip_conntrack_expect"); | |
893 | proc_net_remove("ip_conntrack"); | |
894 | #endif /* CONFIG_PROC_FS */ | |
895 | ip_conntrack_cleanup(); | |
1da177e4 LT |
896 | } |
897 | ||
65b4b4e8 AM |
898 | module_init(ip_conntrack_standalone_init); |
899 | module_exit(ip_conntrack_standalone_fini); | |
1da177e4 LT |
900 | |
901 | /* Some modules need us, but don't depend directly on any symbol. | |
902 | They should call this. */ | |
2e4e6a17 | 903 | void need_conntrack(void) |
1da177e4 LT |
904 | { |
905 | } | |
906 | ||
ac3247ba HW |
907 | #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS |
908 | EXPORT_SYMBOL_GPL(ip_conntrack_chain); | |
909 | EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain); | |
910 | EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier); | |
911 | EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier); | |
a86888b9 | 912 | EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init); |
ac3247ba HW |
913 | EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache); |
914 | #endif | |
1da177e4 LT |
915 | EXPORT_SYMBOL(ip_conntrack_protocol_register); |
916 | EXPORT_SYMBOL(ip_conntrack_protocol_unregister); | |
917 | EXPORT_SYMBOL(ip_ct_get_tuple); | |
918 | EXPORT_SYMBOL(invert_tuplepr); | |
919 | EXPORT_SYMBOL(ip_conntrack_alter_reply); | |
920 | EXPORT_SYMBOL(ip_conntrack_destroyed); | |
2e4e6a17 | 921 | EXPORT_SYMBOL(need_conntrack); |
1da177e4 LT |
922 | EXPORT_SYMBOL(ip_conntrack_helper_register); |
923 | EXPORT_SYMBOL(ip_conntrack_helper_unregister); | |
924 | EXPORT_SYMBOL(ip_ct_iterate_cleanup); | |
1dfbab59 | 925 | EXPORT_SYMBOL(__ip_ct_refresh_acct); |
080774a2 | 926 | |
1da177e4 | 927 | EXPORT_SYMBOL(ip_conntrack_expect_alloc); |
4acdbdbe | 928 | EXPORT_SYMBOL(ip_conntrack_expect_put); |
a41bc002 PM |
929 | EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find); |
930 | EXPORT_SYMBOL_GPL(ip_conntrack_expect_find); | |
1da177e4 LT |
931 | EXPORT_SYMBOL(ip_conntrack_expect_related); |
932 | EXPORT_SYMBOL(ip_conntrack_unexpect_related); | |
080774a2 | 933 | EXPORT_SYMBOL_GPL(ip_conntrack_expect_list); |
49719eb3 | 934 | EXPORT_SYMBOL_GPL(ip_ct_unlink_expect); |
080774a2 | 935 | |
1da177e4 LT |
936 | EXPORT_SYMBOL(ip_conntrack_tuple_taken); |
937 | EXPORT_SYMBOL(ip_ct_gather_frags); | |
938 | EXPORT_SYMBOL(ip_conntrack_htable_size); | |
939 | EXPORT_SYMBOL(ip_conntrack_lock); | |
940 | EXPORT_SYMBOL(ip_conntrack_hash); | |
941 | EXPORT_SYMBOL(ip_conntrack_untracked); | |
942 | EXPORT_SYMBOL_GPL(ip_conntrack_find_get); | |
1da177e4 LT |
943 | #ifdef CONFIG_IP_NF_NAT_NEEDED |
944 | EXPORT_SYMBOL(ip_conntrack_tcp_update); | |
945 | #endif | |
080774a2 HW |
946 | |
947 | EXPORT_SYMBOL_GPL(ip_conntrack_flush); | |
948 | EXPORT_SYMBOL_GPL(__ip_conntrack_find); | |
949 | ||
950 | EXPORT_SYMBOL_GPL(ip_conntrack_alloc); | |
951 | EXPORT_SYMBOL_GPL(ip_conntrack_free); | |
952 | EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert); | |
953 | ||
954 | EXPORT_SYMBOL_GPL(ip_ct_remove_expectations); | |
955 | ||
956 | EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get); | |
957 | EXPORT_SYMBOL_GPL(ip_conntrack_helper_put); | |
958 | EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname); | |
959 | ||
960 | EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get); | |
961 | EXPORT_SYMBOL_GPL(ip_conntrack_proto_put); | |
962 | EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find); | |
39a27a35 | 963 | EXPORT_SYMBOL_GPL(ip_conntrack_checksum); |
080774a2 HW |
964 | #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \ |
965 | defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE) | |
966 | EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr); | |
967 | EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple); | |
968 | #endif |