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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 | |
8 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
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 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/netfilter.h> | |
19 | #include <linux/netfilter_ipv4.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/percpu.h> | |
25 | #ifdef CONFIG_SYSCTL | |
26 | #include <linux/sysctl.h> | |
27 | #endif | |
28 | #include <net/checksum.h> | |
29 | #include <net/ip.h> | |
30 | ||
31 | #define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_conntrack_lock) | |
32 | #define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_conntrack_lock) | |
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 | { | |
122 | READ_LOCK(&ip_conntrack_lock); | |
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 | { | |
134 | READ_UNLOCK(&ip_conntrack_lock); | |
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 | ||
143 | MUST_BE_READ_LOCKED(&ip_conntrack_lock); | |
144 | IP_NF_ASSERT(conntrack); | |
145 | ||
146 | /* we only want to print DIR_ORIGINAL */ | |
147 | if (DIRECTION(hash)) | |
148 | return 0; | |
149 | ||
150 | proto = ip_ct_find_proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL] | |
151 | .tuple.dst.protonum); | |
152 | IP_NF_ASSERT(proto); | |
153 | ||
154 | if (seq_printf(s, "%-8s %u %ld ", | |
155 | proto->name, | |
156 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum, | |
157 | timer_pending(&conntrack->timeout) | |
158 | ? (long)(conntrack->timeout.expires - jiffies)/HZ | |
159 | : 0) != 0) | |
160 | return -ENOSPC; | |
161 | ||
162 | if (proto->print_conntrack(s, conntrack)) | |
163 | return -ENOSPC; | |
164 | ||
165 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
166 | proto)) | |
167 | return -ENOSPC; | |
168 | ||
169 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL])) | |
170 | return -ENOSPC; | |
171 | ||
172 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status))) | |
173 | if (seq_printf(s, "[UNREPLIED] ")) | |
174 | return -ENOSPC; | |
175 | ||
176 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple, | |
177 | proto)) | |
178 | return -ENOSPC; | |
179 | ||
180 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY])) | |
181 | return -ENOSPC; | |
182 | ||
183 | if (test_bit(IPS_ASSURED_BIT, &conntrack->status)) | |
184 | if (seq_printf(s, "[ASSURED] ")) | |
185 | return -ENOSPC; | |
186 | ||
187 | #if defined(CONFIG_IP_NF_CONNTRACK_MARK) | |
188 | if (seq_printf(s, "mark=%lu ", conntrack->mark)) | |
189 | return -ENOSPC; | |
190 | #endif | |
191 | ||
192 | if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) | |
193 | return -ENOSPC; | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static struct seq_operations ct_seq_ops = { | |
199 | .start = ct_seq_start, | |
200 | .next = ct_seq_next, | |
201 | .stop = ct_seq_stop, | |
202 | .show = ct_seq_show | |
203 | }; | |
204 | ||
205 | static int ct_open(struct inode *inode, struct file *file) | |
206 | { | |
207 | struct seq_file *seq; | |
208 | struct ct_iter_state *st; | |
209 | int ret; | |
210 | ||
211 | st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL); | |
212 | if (st == NULL) | |
213 | return -ENOMEM; | |
214 | ret = seq_open(file, &ct_seq_ops); | |
215 | if (ret) | |
216 | goto out_free; | |
217 | seq = file->private_data; | |
218 | seq->private = st; | |
219 | memset(st, 0, sizeof(struct ct_iter_state)); | |
220 | return ret; | |
221 | out_free: | |
222 | kfree(st); | |
223 | return ret; | |
224 | } | |
225 | ||
226 | static struct file_operations ct_file_ops = { | |
227 | .owner = THIS_MODULE, | |
228 | .open = ct_open, | |
229 | .read = seq_read, | |
230 | .llseek = seq_lseek, | |
231 | .release = seq_release_private, | |
232 | }; | |
233 | ||
234 | /* expects */ | |
235 | static void *exp_seq_start(struct seq_file *s, loff_t *pos) | |
236 | { | |
237 | struct list_head *e = &ip_conntrack_expect_list; | |
238 | loff_t i; | |
239 | ||
240 | /* strange seq_file api calls stop even if we fail, | |
241 | * thus we need to grab lock since stop unlocks */ | |
242 | READ_LOCK(&ip_conntrack_lock); | |
243 | ||
244 | if (list_empty(e)) | |
245 | return NULL; | |
246 | ||
247 | for (i = 0; i <= *pos; i++) { | |
248 | e = e->next; | |
249 | if (e == &ip_conntrack_expect_list) | |
250 | return NULL; | |
251 | } | |
252 | return e; | |
253 | } | |
254 | ||
255 | static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
256 | { | |
257 | struct list_head *e = v; | |
258 | ||
259 | e = e->next; | |
260 | ||
261 | if (e == &ip_conntrack_expect_list) | |
262 | return NULL; | |
263 | ||
264 | return e; | |
265 | } | |
266 | ||
267 | static void exp_seq_stop(struct seq_file *s, void *v) | |
268 | { | |
269 | READ_UNLOCK(&ip_conntrack_lock); | |
270 | } | |
271 | ||
272 | static int exp_seq_show(struct seq_file *s, void *v) | |
273 | { | |
274 | struct ip_conntrack_expect *expect = v; | |
275 | ||
276 | if (expect->timeout.function) | |
277 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
278 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
279 | else | |
280 | seq_printf(s, "- "); | |
281 | ||
282 | seq_printf(s, "proto=%u ", expect->tuple.dst.protonum); | |
283 | ||
284 | print_tuple(s, &expect->tuple, | |
285 | ip_ct_find_proto(expect->tuple.dst.protonum)); | |
286 | return seq_putc(s, '\n'); | |
287 | } | |
288 | ||
289 | static struct seq_operations exp_seq_ops = { | |
290 | .start = exp_seq_start, | |
291 | .next = exp_seq_next, | |
292 | .stop = exp_seq_stop, | |
293 | .show = exp_seq_show | |
294 | }; | |
295 | ||
296 | static int exp_open(struct inode *inode, struct file *file) | |
297 | { | |
298 | return seq_open(file, &exp_seq_ops); | |
299 | } | |
300 | ||
301 | static struct file_operations exp_file_ops = { | |
302 | .owner = THIS_MODULE, | |
303 | .open = exp_open, | |
304 | .read = seq_read, | |
305 | .llseek = seq_lseek, | |
306 | .release = seq_release | |
307 | }; | |
308 | ||
309 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
310 | { | |
311 | int cpu; | |
312 | ||
313 | if (*pos == 0) | |
314 | return SEQ_START_TOKEN; | |
315 | ||
316 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
317 | if (!cpu_possible(cpu)) | |
318 | continue; | |
319 | *pos = cpu+1; | |
320 | return &per_cpu(ip_conntrack_stat, cpu); | |
321 | } | |
322 | ||
323 | return NULL; | |
324 | } | |
325 | ||
326 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
327 | { | |
328 | int cpu; | |
329 | ||
330 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
331 | if (!cpu_possible(cpu)) | |
332 | continue; | |
333 | *pos = cpu+1; | |
334 | return &per_cpu(ip_conntrack_stat, cpu); | |
335 | } | |
336 | ||
337 | return NULL; | |
338 | } | |
339 | ||
340 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) | |
341 | { | |
342 | } | |
343 | ||
344 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) | |
345 | { | |
346 | unsigned int nr_conntracks = atomic_read(&ip_conntrack_count); | |
347 | struct ip_conntrack_stat *st = v; | |
348 | ||
349 | if (v == SEQ_START_TOKEN) { | |
350 | 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"); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " | |
355 | "%08x %08x %08x %08x %08x %08x %08x %08x \n", | |
356 | nr_conntracks, | |
357 | st->searched, | |
358 | st->found, | |
359 | st->new, | |
360 | st->invalid, | |
361 | st->ignore, | |
362 | st->delete, | |
363 | st->delete_list, | |
364 | st->insert, | |
365 | st->insert_failed, | |
366 | st->drop, | |
367 | st->early_drop, | |
368 | st->error, | |
369 | ||
370 | st->expect_new, | |
371 | st->expect_create, | |
372 | st->expect_delete | |
373 | ); | |
374 | return 0; | |
375 | } | |
376 | ||
377 | static struct seq_operations ct_cpu_seq_ops = { | |
378 | .start = ct_cpu_seq_start, | |
379 | .next = ct_cpu_seq_next, | |
380 | .stop = ct_cpu_seq_stop, | |
381 | .show = ct_cpu_seq_show, | |
382 | }; | |
383 | ||
384 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) | |
385 | { | |
386 | return seq_open(file, &ct_cpu_seq_ops); | |
387 | } | |
388 | ||
389 | static struct file_operations ct_cpu_seq_fops = { | |
390 | .owner = THIS_MODULE, | |
391 | .open = ct_cpu_seq_open, | |
392 | .read = seq_read, | |
393 | .llseek = seq_lseek, | |
394 | .release = seq_release_private, | |
395 | }; | |
396 | #endif | |
397 | ||
398 | static unsigned int ip_confirm(unsigned int hooknum, | |
399 | struct sk_buff **pskb, | |
400 | const struct net_device *in, | |
401 | const struct net_device *out, | |
402 | int (*okfn)(struct sk_buff *)) | |
403 | { | |
404 | struct ip_conntrack *ct; | |
405 | enum ip_conntrack_info ctinfo; | |
406 | ||
407 | /* This is where we call the helper: as the packet goes out. */ | |
408 | ct = ip_conntrack_get(*pskb, &ctinfo); | |
409 | if (ct && ct->helper) { | |
410 | unsigned int ret; | |
411 | ret = ct->helper->help(pskb, ct, ctinfo); | |
412 | if (ret != NF_ACCEPT) | |
413 | return ret; | |
414 | } | |
415 | ||
416 | /* We've seen it coming out the other side: confirm it */ | |
417 | return ip_conntrack_confirm(pskb); | |
418 | } | |
419 | ||
420 | static unsigned int ip_conntrack_defrag(unsigned int hooknum, | |
421 | struct sk_buff **pskb, | |
422 | const struct net_device *in, | |
423 | const struct net_device *out, | |
424 | int (*okfn)(struct sk_buff *)) | |
425 | { | |
426 | #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE) | |
427 | /* Previously seen (loopback)? Ignore. Do this before | |
428 | fragment check. */ | |
429 | if ((*pskb)->nfct) | |
430 | return NF_ACCEPT; | |
431 | #endif | |
432 | ||
433 | /* Gather fragments. */ | |
434 | if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) { | |
435 | *pskb = ip_ct_gather_frags(*pskb, | |
436 | hooknum == NF_IP_PRE_ROUTING ? | |
437 | IP_DEFRAG_CONNTRACK_IN : | |
438 | IP_DEFRAG_CONNTRACK_OUT); | |
439 | if (!*pskb) | |
440 | return NF_STOLEN; | |
441 | } | |
442 | return NF_ACCEPT; | |
443 | } | |
444 | ||
445 | static unsigned int ip_refrag(unsigned int hooknum, | |
446 | struct sk_buff **pskb, | |
447 | const struct net_device *in, | |
448 | const struct net_device *out, | |
449 | int (*okfn)(struct sk_buff *)) | |
450 | { | |
451 | struct rtable *rt = (struct rtable *)(*pskb)->dst; | |
452 | ||
453 | /* We've seen it coming out the other side: confirm */ | |
454 | if (ip_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT) | |
455 | return NF_DROP; | |
456 | ||
457 | /* Local packets are never produced too large for their | |
458 | interface. We degfragment them at LOCAL_OUT, however, | |
459 | so we have to refragment them here. */ | |
460 | if ((*pskb)->len > dst_mtu(&rt->u.dst) && | |
461 | !skb_shinfo(*pskb)->tso_size) { | |
462 | /* No hook can be after us, so this should be OK. */ | |
463 | ip_fragment(*pskb, okfn); | |
464 | return NF_STOLEN; | |
465 | } | |
466 | return NF_ACCEPT; | |
467 | } | |
468 | ||
469 | static unsigned int ip_conntrack_local(unsigned int hooknum, | |
470 | struct sk_buff **pskb, | |
471 | const struct net_device *in, | |
472 | const struct net_device *out, | |
473 | int (*okfn)(struct sk_buff *)) | |
474 | { | |
475 | /* root is playing with raw sockets. */ | |
476 | if ((*pskb)->len < sizeof(struct iphdr) | |
477 | || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) { | |
478 | if (net_ratelimit()) | |
479 | printk("ipt_hook: happy cracking.\n"); | |
480 | return NF_ACCEPT; | |
481 | } | |
482 | return ip_conntrack_in(hooknum, pskb, in, out, okfn); | |
483 | } | |
484 | ||
485 | /* Connection tracking may drop packets, but never alters them, so | |
486 | make it the first hook. */ | |
487 | static struct nf_hook_ops ip_conntrack_defrag_ops = { | |
488 | .hook = ip_conntrack_defrag, | |
489 | .owner = THIS_MODULE, | |
490 | .pf = PF_INET, | |
491 | .hooknum = NF_IP_PRE_ROUTING, | |
492 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
493 | }; | |
494 | ||
495 | static struct nf_hook_ops ip_conntrack_in_ops = { | |
496 | .hook = ip_conntrack_in, | |
497 | .owner = THIS_MODULE, | |
498 | .pf = PF_INET, | |
499 | .hooknum = NF_IP_PRE_ROUTING, | |
500 | .priority = NF_IP_PRI_CONNTRACK, | |
501 | }; | |
502 | ||
503 | static struct nf_hook_ops ip_conntrack_defrag_local_out_ops = { | |
504 | .hook = ip_conntrack_defrag, | |
505 | .owner = THIS_MODULE, | |
506 | .pf = PF_INET, | |
507 | .hooknum = NF_IP_LOCAL_OUT, | |
508 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
509 | }; | |
510 | ||
511 | static struct nf_hook_ops ip_conntrack_local_out_ops = { | |
512 | .hook = ip_conntrack_local, | |
513 | .owner = THIS_MODULE, | |
514 | .pf = PF_INET, | |
515 | .hooknum = NF_IP_LOCAL_OUT, | |
516 | .priority = NF_IP_PRI_CONNTRACK, | |
517 | }; | |
518 | ||
519 | /* Refragmenter; last chance. */ | |
520 | static struct nf_hook_ops ip_conntrack_out_ops = { | |
521 | .hook = ip_refrag, | |
522 | .owner = THIS_MODULE, | |
523 | .pf = PF_INET, | |
524 | .hooknum = NF_IP_POST_ROUTING, | |
525 | .priority = NF_IP_PRI_LAST, | |
526 | }; | |
527 | ||
528 | static struct nf_hook_ops ip_conntrack_local_in_ops = { | |
529 | .hook = ip_confirm, | |
530 | .owner = THIS_MODULE, | |
531 | .pf = PF_INET, | |
532 | .hooknum = NF_IP_LOCAL_IN, | |
533 | .priority = NF_IP_PRI_LAST-1, | |
534 | }; | |
535 | ||
536 | /* Sysctl support */ | |
537 | ||
538 | #ifdef CONFIG_SYSCTL | |
539 | ||
540 | /* From ip_conntrack_core.c */ | |
541 | extern int ip_conntrack_max; | |
542 | extern unsigned int ip_conntrack_htable_size; | |
543 | ||
544 | /* From ip_conntrack_proto_tcp.c */ | |
545 | extern unsigned long ip_ct_tcp_timeout_syn_sent; | |
546 | extern unsigned long ip_ct_tcp_timeout_syn_recv; | |
547 | extern unsigned long ip_ct_tcp_timeout_established; | |
548 | extern unsigned long ip_ct_tcp_timeout_fin_wait; | |
549 | extern unsigned long ip_ct_tcp_timeout_close_wait; | |
550 | extern unsigned long ip_ct_tcp_timeout_last_ack; | |
551 | extern unsigned long ip_ct_tcp_timeout_time_wait; | |
552 | extern unsigned long ip_ct_tcp_timeout_close; | |
553 | extern unsigned long ip_ct_tcp_timeout_max_retrans; | |
554 | extern int ip_ct_tcp_loose; | |
555 | extern int ip_ct_tcp_be_liberal; | |
556 | extern int ip_ct_tcp_max_retrans; | |
557 | ||
558 | /* From ip_conntrack_proto_udp.c */ | |
559 | extern unsigned long ip_ct_udp_timeout; | |
560 | extern unsigned long ip_ct_udp_timeout_stream; | |
561 | ||
562 | /* From ip_conntrack_proto_icmp.c */ | |
563 | extern unsigned long ip_ct_icmp_timeout; | |
564 | ||
565 | /* From ip_conntrack_proto_icmp.c */ | |
566 | extern unsigned long ip_ct_generic_timeout; | |
567 | ||
568 | /* Log invalid packets of a given protocol */ | |
569 | static int log_invalid_proto_min = 0; | |
570 | static int log_invalid_proto_max = 255; | |
571 | ||
572 | static struct ctl_table_header *ip_ct_sysctl_header; | |
573 | ||
574 | static ctl_table ip_ct_sysctl_table[] = { | |
575 | { | |
576 | .ctl_name = NET_IPV4_NF_CONNTRACK_MAX, | |
577 | .procname = "ip_conntrack_max", | |
578 | .data = &ip_conntrack_max, | |
579 | .maxlen = sizeof(int), | |
580 | .mode = 0644, | |
581 | .proc_handler = &proc_dointvec, | |
582 | }, | |
583 | { | |
584 | .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT, | |
585 | .procname = "ip_conntrack_count", | |
586 | .data = &ip_conntrack_count, | |
587 | .maxlen = sizeof(int), | |
588 | .mode = 0444, | |
589 | .proc_handler = &proc_dointvec, | |
590 | }, | |
591 | { | |
592 | .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS, | |
593 | .procname = "ip_conntrack_buckets", | |
594 | .data = &ip_conntrack_htable_size, | |
595 | .maxlen = sizeof(unsigned int), | |
596 | .mode = 0444, | |
597 | .proc_handler = &proc_dointvec, | |
598 | }, | |
599 | { | |
600 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
601 | .procname = "ip_conntrack_tcp_timeout_syn_sent", | |
602 | .data = &ip_ct_tcp_timeout_syn_sent, | |
603 | .maxlen = sizeof(unsigned int), | |
604 | .mode = 0644, | |
605 | .proc_handler = &proc_dointvec_jiffies, | |
606 | }, | |
607 | { | |
608 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
609 | .procname = "ip_conntrack_tcp_timeout_syn_recv", | |
610 | .data = &ip_ct_tcp_timeout_syn_recv, | |
611 | .maxlen = sizeof(unsigned int), | |
612 | .mode = 0644, | |
613 | .proc_handler = &proc_dointvec_jiffies, | |
614 | }, | |
615 | { | |
616 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
617 | .procname = "ip_conntrack_tcp_timeout_established", | |
618 | .data = &ip_ct_tcp_timeout_established, | |
619 | .maxlen = sizeof(unsigned int), | |
620 | .mode = 0644, | |
621 | .proc_handler = &proc_dointvec_jiffies, | |
622 | }, | |
623 | { | |
624 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
625 | .procname = "ip_conntrack_tcp_timeout_fin_wait", | |
626 | .data = &ip_ct_tcp_timeout_fin_wait, | |
627 | .maxlen = sizeof(unsigned int), | |
628 | .mode = 0644, | |
629 | .proc_handler = &proc_dointvec_jiffies, | |
630 | }, | |
631 | { | |
632 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
633 | .procname = "ip_conntrack_tcp_timeout_close_wait", | |
634 | .data = &ip_ct_tcp_timeout_close_wait, | |
635 | .maxlen = sizeof(unsigned int), | |
636 | .mode = 0644, | |
637 | .proc_handler = &proc_dointvec_jiffies, | |
638 | }, | |
639 | { | |
640 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
641 | .procname = "ip_conntrack_tcp_timeout_last_ack", | |
642 | .data = &ip_ct_tcp_timeout_last_ack, | |
643 | .maxlen = sizeof(unsigned int), | |
644 | .mode = 0644, | |
645 | .proc_handler = &proc_dointvec_jiffies, | |
646 | }, | |
647 | { | |
648 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
649 | .procname = "ip_conntrack_tcp_timeout_time_wait", | |
650 | .data = &ip_ct_tcp_timeout_time_wait, | |
651 | .maxlen = sizeof(unsigned int), | |
652 | .mode = 0644, | |
653 | .proc_handler = &proc_dointvec_jiffies, | |
654 | }, | |
655 | { | |
656 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
657 | .procname = "ip_conntrack_tcp_timeout_close", | |
658 | .data = &ip_ct_tcp_timeout_close, | |
659 | .maxlen = sizeof(unsigned int), | |
660 | .mode = 0644, | |
661 | .proc_handler = &proc_dointvec_jiffies, | |
662 | }, | |
663 | { | |
664 | .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT, | |
665 | .procname = "ip_conntrack_udp_timeout", | |
666 | .data = &ip_ct_udp_timeout, | |
667 | .maxlen = sizeof(unsigned int), | |
668 | .mode = 0644, | |
669 | .proc_handler = &proc_dointvec_jiffies, | |
670 | }, | |
671 | { | |
672 | .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM, | |
673 | .procname = "ip_conntrack_udp_timeout_stream", | |
674 | .data = &ip_ct_udp_timeout_stream, | |
675 | .maxlen = sizeof(unsigned int), | |
676 | .mode = 0644, | |
677 | .proc_handler = &proc_dointvec_jiffies, | |
678 | }, | |
679 | { | |
680 | .ctl_name = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT, | |
681 | .procname = "ip_conntrack_icmp_timeout", | |
682 | .data = &ip_ct_icmp_timeout, | |
683 | .maxlen = sizeof(unsigned int), | |
684 | .mode = 0644, | |
685 | .proc_handler = &proc_dointvec_jiffies, | |
686 | }, | |
687 | { | |
688 | .ctl_name = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT, | |
689 | .procname = "ip_conntrack_generic_timeout", | |
690 | .data = &ip_ct_generic_timeout, | |
691 | .maxlen = sizeof(unsigned int), | |
692 | .mode = 0644, | |
693 | .proc_handler = &proc_dointvec_jiffies, | |
694 | }, | |
695 | { | |
696 | .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID, | |
697 | .procname = "ip_conntrack_log_invalid", | |
698 | .data = &ip_ct_log_invalid, | |
699 | .maxlen = sizeof(unsigned int), | |
700 | .mode = 0644, | |
701 | .proc_handler = &proc_dointvec_minmax, | |
702 | .strategy = &sysctl_intvec, | |
703 | .extra1 = &log_invalid_proto_min, | |
704 | .extra2 = &log_invalid_proto_max, | |
705 | }, | |
706 | { | |
707 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
708 | .procname = "ip_conntrack_tcp_timeout_max_retrans", | |
709 | .data = &ip_ct_tcp_timeout_max_retrans, | |
710 | .maxlen = sizeof(unsigned int), | |
711 | .mode = 0644, | |
712 | .proc_handler = &proc_dointvec_jiffies, | |
713 | }, | |
714 | { | |
715 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
716 | .procname = "ip_conntrack_tcp_loose", | |
717 | .data = &ip_ct_tcp_loose, | |
718 | .maxlen = sizeof(unsigned int), | |
719 | .mode = 0644, | |
720 | .proc_handler = &proc_dointvec, | |
721 | }, | |
722 | { | |
723 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
724 | .procname = "ip_conntrack_tcp_be_liberal", | |
725 | .data = &ip_ct_tcp_be_liberal, | |
726 | .maxlen = sizeof(unsigned int), | |
727 | .mode = 0644, | |
728 | .proc_handler = &proc_dointvec, | |
729 | }, | |
730 | { | |
731 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
732 | .procname = "ip_conntrack_tcp_max_retrans", | |
733 | .data = &ip_ct_tcp_max_retrans, | |
734 | .maxlen = sizeof(unsigned int), | |
735 | .mode = 0644, | |
736 | .proc_handler = &proc_dointvec, | |
737 | }, | |
738 | { .ctl_name = 0 } | |
739 | }; | |
740 | ||
741 | #define NET_IP_CONNTRACK_MAX 2089 | |
742 | ||
743 | static ctl_table ip_ct_netfilter_table[] = { | |
744 | { | |
745 | .ctl_name = NET_IPV4_NETFILTER, | |
746 | .procname = "netfilter", | |
747 | .mode = 0555, | |
748 | .child = ip_ct_sysctl_table, | |
749 | }, | |
750 | { | |
751 | .ctl_name = NET_IP_CONNTRACK_MAX, | |
752 | .procname = "ip_conntrack_max", | |
753 | .data = &ip_conntrack_max, | |
754 | .maxlen = sizeof(int), | |
755 | .mode = 0644, | |
756 | .proc_handler = &proc_dointvec | |
757 | }, | |
758 | { .ctl_name = 0 } | |
759 | }; | |
760 | ||
761 | static ctl_table ip_ct_ipv4_table[] = { | |
762 | { | |
763 | .ctl_name = NET_IPV4, | |
764 | .procname = "ipv4", | |
765 | .mode = 0555, | |
766 | .child = ip_ct_netfilter_table, | |
767 | }, | |
768 | { .ctl_name = 0 } | |
769 | }; | |
770 | ||
771 | static ctl_table ip_ct_net_table[] = { | |
772 | { | |
773 | .ctl_name = CTL_NET, | |
774 | .procname = "net", | |
775 | .mode = 0555, | |
776 | .child = ip_ct_ipv4_table, | |
777 | }, | |
778 | { .ctl_name = 0 } | |
779 | }; | |
780 | ||
781 | EXPORT_SYMBOL(ip_ct_log_invalid); | |
782 | #endif /* CONFIG_SYSCTL */ | |
783 | ||
784 | static int init_or_cleanup(int init) | |
785 | { | |
786 | #ifdef CONFIG_PROC_FS | |
787 | struct proc_dir_entry *proc, *proc_exp, *proc_stat; | |
788 | #endif | |
789 | int ret = 0; | |
790 | ||
791 | if (!init) goto cleanup; | |
792 | ||
793 | ret = ip_conntrack_init(); | |
794 | if (ret < 0) | |
795 | goto cleanup_nothing; | |
796 | ||
797 | #ifdef CONFIG_PROC_FS | |
798 | ret = -ENOMEM; | |
799 | proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops); | |
800 | if (!proc) goto cleanup_init; | |
801 | ||
802 | proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440, | |
803 | &exp_file_ops); | |
804 | if (!proc_exp) goto cleanup_proc; | |
805 | ||
806 | proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat); | |
807 | if (!proc_stat) | |
808 | goto cleanup_proc_exp; | |
809 | ||
810 | proc_stat->proc_fops = &ct_cpu_seq_fops; | |
811 | proc_stat->owner = THIS_MODULE; | |
812 | #endif | |
813 | ||
814 | ret = nf_register_hook(&ip_conntrack_defrag_ops); | |
815 | if (ret < 0) { | |
816 | printk("ip_conntrack: can't register pre-routing defrag hook.\n"); | |
817 | goto cleanup_proc_stat; | |
818 | } | |
819 | ret = nf_register_hook(&ip_conntrack_defrag_local_out_ops); | |
820 | if (ret < 0) { | |
821 | printk("ip_conntrack: can't register local_out defrag hook.\n"); | |
822 | goto cleanup_defragops; | |
823 | } | |
824 | ret = nf_register_hook(&ip_conntrack_in_ops); | |
825 | if (ret < 0) { | |
826 | printk("ip_conntrack: can't register pre-routing hook.\n"); | |
827 | goto cleanup_defraglocalops; | |
828 | } | |
829 | ret = nf_register_hook(&ip_conntrack_local_out_ops); | |
830 | if (ret < 0) { | |
831 | printk("ip_conntrack: can't register local out hook.\n"); | |
832 | goto cleanup_inops; | |
833 | } | |
834 | ret = nf_register_hook(&ip_conntrack_out_ops); | |
835 | if (ret < 0) { | |
836 | printk("ip_conntrack: can't register post-routing hook.\n"); | |
837 | goto cleanup_inandlocalops; | |
838 | } | |
839 | ret = nf_register_hook(&ip_conntrack_local_in_ops); | |
840 | if (ret < 0) { | |
841 | printk("ip_conntrack: can't register local in hook.\n"); | |
842 | goto cleanup_inoutandlocalops; | |
843 | } | |
844 | #ifdef CONFIG_SYSCTL | |
845 | ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0); | |
846 | if (ip_ct_sysctl_header == NULL) { | |
847 | printk("ip_conntrack: can't register to sysctl.\n"); | |
848 | ret = -ENOMEM; | |
849 | goto cleanup_localinops; | |
850 | } | |
851 | #endif | |
852 | ||
853 | return ret; | |
854 | ||
855 | cleanup: | |
856 | #ifdef CONFIG_SYSCTL | |
857 | unregister_sysctl_table(ip_ct_sysctl_header); | |
858 | cleanup_localinops: | |
859 | #endif | |
860 | nf_unregister_hook(&ip_conntrack_local_in_ops); | |
861 | cleanup_inoutandlocalops: | |
862 | nf_unregister_hook(&ip_conntrack_out_ops); | |
863 | cleanup_inandlocalops: | |
864 | nf_unregister_hook(&ip_conntrack_local_out_ops); | |
865 | cleanup_inops: | |
866 | nf_unregister_hook(&ip_conntrack_in_ops); | |
867 | cleanup_defraglocalops: | |
868 | nf_unregister_hook(&ip_conntrack_defrag_local_out_ops); | |
869 | cleanup_defragops: | |
870 | nf_unregister_hook(&ip_conntrack_defrag_ops); | |
871 | cleanup_proc_stat: | |
872 | #ifdef CONFIG_PROC_FS | |
873 | remove_proc_entry("ip_conntrack", proc_net_stat); | |
874 | cleanup_proc_exp: | |
875 | proc_net_remove("ip_conntrack_expect"); | |
876 | cleanup_proc: | |
877 | proc_net_remove("ip_conntrack"); | |
878 | cleanup_init: | |
879 | #endif /* CONFIG_PROC_FS */ | |
880 | ip_conntrack_cleanup(); | |
881 | cleanup_nothing: | |
882 | return ret; | |
883 | } | |
884 | ||
885 | /* FIXME: Allow NULL functions and sub in pointers to generic for | |
886 | them. --RR */ | |
887 | int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto) | |
888 | { | |
889 | int ret = 0; | |
890 | ||
891 | WRITE_LOCK(&ip_conntrack_lock); | |
892 | if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) { | |
893 | ret = -EBUSY; | |
894 | goto out; | |
895 | } | |
896 | ip_ct_protos[proto->proto] = proto; | |
897 | out: | |
898 | WRITE_UNLOCK(&ip_conntrack_lock); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto) | |
903 | { | |
904 | WRITE_LOCK(&ip_conntrack_lock); | |
905 | ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol; | |
906 | WRITE_UNLOCK(&ip_conntrack_lock); | |
907 | ||
908 | /* Somebody could be still looking at the proto in bh. */ | |
909 | synchronize_net(); | |
910 | ||
911 | /* Remove all contrack entries for this protocol */ | |
912 | ip_ct_iterate_cleanup(kill_proto, &proto->proto); | |
913 | } | |
914 | ||
915 | static int __init init(void) | |
916 | { | |
917 | return init_or_cleanup(1); | |
918 | } | |
919 | ||
920 | static void __exit fini(void) | |
921 | { | |
922 | init_or_cleanup(0); | |
923 | } | |
924 | ||
925 | module_init(init); | |
926 | module_exit(fini); | |
927 | ||
928 | /* Some modules need us, but don't depend directly on any symbol. | |
929 | They should call this. */ | |
930 | void need_ip_conntrack(void) | |
931 | { | |
932 | } | |
933 | ||
934 | EXPORT_SYMBOL(ip_conntrack_protocol_register); | |
935 | EXPORT_SYMBOL(ip_conntrack_protocol_unregister); | |
936 | EXPORT_SYMBOL(ip_ct_get_tuple); | |
937 | EXPORT_SYMBOL(invert_tuplepr); | |
938 | EXPORT_SYMBOL(ip_conntrack_alter_reply); | |
939 | EXPORT_SYMBOL(ip_conntrack_destroyed); | |
940 | EXPORT_SYMBOL(need_ip_conntrack); | |
941 | EXPORT_SYMBOL(ip_conntrack_helper_register); | |
942 | EXPORT_SYMBOL(ip_conntrack_helper_unregister); | |
943 | EXPORT_SYMBOL(ip_ct_iterate_cleanup); | |
944 | EXPORT_SYMBOL(ip_ct_refresh_acct); | |
945 | EXPORT_SYMBOL(ip_ct_protos); | |
946 | EXPORT_SYMBOL(ip_ct_find_proto); | |
947 | EXPORT_SYMBOL(ip_conntrack_expect_alloc); | |
948 | EXPORT_SYMBOL(ip_conntrack_expect_free); | |
949 | EXPORT_SYMBOL(ip_conntrack_expect_related); | |
950 | EXPORT_SYMBOL(ip_conntrack_unexpect_related); | |
951 | EXPORT_SYMBOL(ip_conntrack_tuple_taken); | |
952 | EXPORT_SYMBOL(ip_ct_gather_frags); | |
953 | EXPORT_SYMBOL(ip_conntrack_htable_size); | |
954 | EXPORT_SYMBOL(ip_conntrack_lock); | |
955 | EXPORT_SYMBOL(ip_conntrack_hash); | |
956 | EXPORT_SYMBOL(ip_conntrack_untracked); | |
957 | EXPORT_SYMBOL_GPL(ip_conntrack_find_get); | |
958 | EXPORT_SYMBOL_GPL(ip_conntrack_put); | |
959 | #ifdef CONFIG_IP_NF_NAT_NEEDED | |
960 | EXPORT_SYMBOL(ip_conntrack_tcp_update); | |
961 | #endif |