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9fb9cbb1 YK |
1 | /* This file contains all the functions required for the standalone |
2 | nf_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 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
15 | * - generalize L3 protocol dependent part. | |
16 | * | |
17 | * Derived from net/ipv4/netfilter/ip_conntrack_standalone.c | |
18 | */ | |
19 | ||
20 | #include <linux/config.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/netfilter.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/percpu.h> | |
28 | #include <linux/netdevice.h> | |
29 | #ifdef CONFIG_SYSCTL | |
30 | #include <linux/sysctl.h> | |
31 | #endif | |
32 | ||
33 | #define ASSERT_READ_LOCK(x) | |
34 | #define ASSERT_WRITE_LOCK(x) | |
35 | ||
36 | #include <net/netfilter/nf_conntrack.h> | |
37 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
38 | #include <net/netfilter/nf_conntrack_protocol.h> | |
39 | #include <net/netfilter/nf_conntrack_core.h> | |
40 | #include <net/netfilter/nf_conntrack_helper.h> | |
41 | #include <linux/netfilter_ipv4/listhelp.h> | |
42 | ||
43 | #if 0 | |
44 | #define DEBUGP printk | |
45 | #else | |
46 | #define DEBUGP(format, args...) | |
47 | #endif | |
48 | ||
49 | MODULE_LICENSE("GPL"); | |
50 | ||
51 | extern atomic_t nf_conntrack_count; | |
52 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); | |
53 | ||
54 | static int kill_l3proto(struct nf_conn *i, void *data) | |
55 | { | |
56 | return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num == | |
57 | ((struct nf_conntrack_l3proto *)data)->l3proto); | |
58 | } | |
59 | ||
60 | static int kill_proto(struct nf_conn *i, void *data) | |
61 | { | |
62 | struct nf_conntrack_protocol *proto; | |
63 | proto = (struct nf_conntrack_protocol *)data; | |
64 | return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == | |
65 | proto->proto) && | |
66 | (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num == | |
67 | proto->l3proto); | |
68 | } | |
69 | ||
70 | #ifdef CONFIG_PROC_FS | |
71 | static int | |
72 | print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, | |
73 | struct nf_conntrack_l3proto *l3proto, | |
74 | struct nf_conntrack_protocol *proto) | |
75 | { | |
76 | return l3proto->print_tuple(s, tuple) || proto->print_tuple(s, tuple); | |
77 | } | |
78 | ||
79 | #ifdef CONFIG_NF_CT_ACCT | |
80 | static unsigned int | |
81 | seq_print_counters(struct seq_file *s, | |
82 | const struct ip_conntrack_counter *counter) | |
83 | { | |
84 | return seq_printf(s, "packets=%llu bytes=%llu ", | |
85 | (unsigned long long)counter->packets, | |
86 | (unsigned long long)counter->bytes); | |
87 | } | |
88 | #else | |
89 | #define seq_print_counters(x, y) 0 | |
90 | #endif | |
91 | ||
92 | struct ct_iter_state { | |
93 | unsigned int bucket; | |
94 | }; | |
95 | ||
96 | static struct list_head *ct_get_first(struct seq_file *seq) | |
97 | { | |
98 | struct ct_iter_state *st = seq->private; | |
99 | ||
100 | for (st->bucket = 0; | |
101 | st->bucket < nf_conntrack_htable_size; | |
102 | st->bucket++) { | |
103 | if (!list_empty(&nf_conntrack_hash[st->bucket])) | |
104 | return nf_conntrack_hash[st->bucket].next; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head) | |
110 | { | |
111 | struct ct_iter_state *st = seq->private; | |
112 | ||
113 | head = head->next; | |
114 | while (head == &nf_conntrack_hash[st->bucket]) { | |
115 | if (++st->bucket >= nf_conntrack_htable_size) | |
116 | return NULL; | |
117 | head = nf_conntrack_hash[st->bucket].next; | |
118 | } | |
119 | return head; | |
120 | } | |
121 | ||
122 | static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos) | |
123 | { | |
124 | struct list_head *head = ct_get_first(seq); | |
125 | ||
126 | if (head) | |
127 | while (pos && (head = ct_get_next(seq, head))) | |
128 | pos--; | |
129 | return pos ? NULL : head; | |
130 | } | |
131 | ||
132 | static void *ct_seq_start(struct seq_file *seq, loff_t *pos) | |
133 | { | |
134 | read_lock_bh(&nf_conntrack_lock); | |
135 | return ct_get_idx(seq, *pos); | |
136 | } | |
137 | ||
138 | static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
139 | { | |
140 | (*pos)++; | |
141 | return ct_get_next(s, v); | |
142 | } | |
143 | ||
144 | static void ct_seq_stop(struct seq_file *s, void *v) | |
145 | { | |
146 | read_unlock_bh(&nf_conntrack_lock); | |
147 | } | |
148 | ||
149 | /* return 0 on success, 1 in case of error */ | |
150 | static int ct_seq_show(struct seq_file *s, void *v) | |
151 | { | |
152 | const struct nf_conntrack_tuple_hash *hash = v; | |
153 | const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash); | |
154 | struct nf_conntrack_l3proto *l3proto; | |
155 | struct nf_conntrack_protocol *proto; | |
156 | ||
157 | ASSERT_READ_LOCK(&nf_conntrack_lock); | |
158 | NF_CT_ASSERT(conntrack); | |
159 | ||
160 | /* we only want to print DIR_ORIGINAL */ | |
161 | if (NF_CT_DIRECTION(hash)) | |
162 | return 0; | |
163 | ||
c1d10adb PNA |
164 | l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL] |
165 | .tuple.src.l3num); | |
9fb9cbb1 YK |
166 | |
167 | NF_CT_ASSERT(l3proto); | |
c1d10adb PNA |
168 | proto = __nf_ct_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL] |
169 | .tuple.src.l3num, | |
170 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL] | |
171 | .tuple.dst.protonum); | |
9fb9cbb1 YK |
172 | NF_CT_ASSERT(proto); |
173 | ||
174 | if (seq_printf(s, "%-8s %u %-8s %u %ld ", | |
175 | l3proto->name, | |
176 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, | |
177 | proto->name, | |
178 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum, | |
179 | timer_pending(&conntrack->timeout) | |
180 | ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0) | |
181 | return -ENOSPC; | |
182 | ||
183 | if (l3proto->print_conntrack(s, conntrack)) | |
184 | return -ENOSPC; | |
185 | ||
186 | if (proto->print_conntrack(s, conntrack)) | |
187 | return -ENOSPC; | |
188 | ||
189 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
190 | l3proto, proto)) | |
191 | return -ENOSPC; | |
192 | ||
193 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL])) | |
194 | return -ENOSPC; | |
195 | ||
196 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status))) | |
197 | if (seq_printf(s, "[UNREPLIED] ")) | |
198 | return -ENOSPC; | |
199 | ||
200 | if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple, | |
201 | l3proto, proto)) | |
202 | return -ENOSPC; | |
203 | ||
204 | if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY])) | |
205 | return -ENOSPC; | |
206 | ||
207 | if (test_bit(IPS_ASSURED_BIT, &conntrack->status)) | |
208 | if (seq_printf(s, "[ASSURED] ")) | |
209 | return -ENOSPC; | |
210 | ||
211 | #if defined(CONFIG_NF_CONNTRACK_MARK) | |
212 | if (seq_printf(s, "mark=%u ", conntrack->mark)) | |
213 | return -ENOSPC; | |
214 | #endif | |
215 | ||
216 | if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) | |
217 | return -ENOSPC; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static struct seq_operations ct_seq_ops = { | |
223 | .start = ct_seq_start, | |
224 | .next = ct_seq_next, | |
225 | .stop = ct_seq_stop, | |
226 | .show = ct_seq_show | |
227 | }; | |
228 | ||
229 | static int ct_open(struct inode *inode, struct file *file) | |
230 | { | |
231 | struct seq_file *seq; | |
232 | struct ct_iter_state *st; | |
233 | int ret; | |
234 | ||
235 | st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL); | |
236 | if (st == NULL) | |
237 | return -ENOMEM; | |
238 | ret = seq_open(file, &ct_seq_ops); | |
239 | if (ret) | |
240 | goto out_free; | |
241 | seq = file->private_data; | |
242 | seq->private = st; | |
243 | memset(st, 0, sizeof(struct ct_iter_state)); | |
244 | return ret; | |
245 | out_free: | |
246 | kfree(st); | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static struct file_operations ct_file_ops = { | |
251 | .owner = THIS_MODULE, | |
252 | .open = ct_open, | |
253 | .read = seq_read, | |
254 | .llseek = seq_lseek, | |
255 | .release = seq_release_private, | |
256 | }; | |
257 | ||
258 | /* expects */ | |
259 | static void *exp_seq_start(struct seq_file *s, loff_t *pos) | |
260 | { | |
261 | struct list_head *e = &nf_conntrack_expect_list; | |
262 | loff_t i; | |
263 | ||
264 | /* strange seq_file api calls stop even if we fail, | |
265 | * thus we need to grab lock since stop unlocks */ | |
266 | read_lock_bh(&nf_conntrack_lock); | |
267 | ||
268 | if (list_empty(e)) | |
269 | return NULL; | |
270 | ||
271 | for (i = 0; i <= *pos; i++) { | |
272 | e = e->next; | |
273 | if (e == &nf_conntrack_expect_list) | |
274 | return NULL; | |
275 | } | |
276 | return e; | |
277 | } | |
278 | ||
279 | static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
280 | { | |
281 | struct list_head *e = v; | |
282 | ||
283 | ++*pos; | |
284 | e = e->next; | |
285 | ||
286 | if (e == &nf_conntrack_expect_list) | |
287 | return NULL; | |
288 | ||
289 | return e; | |
290 | } | |
291 | ||
292 | static void exp_seq_stop(struct seq_file *s, void *v) | |
293 | { | |
294 | read_unlock_bh(&nf_conntrack_lock); | |
295 | } | |
296 | ||
297 | static int exp_seq_show(struct seq_file *s, void *v) | |
298 | { | |
299 | struct nf_conntrack_expect *expect = v; | |
300 | ||
301 | if (expect->timeout.function) | |
302 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) | |
303 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); | |
304 | else | |
305 | seq_printf(s, "- "); | |
306 | seq_printf(s, "l3proto = %u proto=%u ", | |
307 | expect->tuple.src.l3num, | |
308 | expect->tuple.dst.protonum); | |
309 | print_tuple(s, &expect->tuple, | |
c1d10adb PNA |
310 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
311 | __nf_ct_proto_find(expect->tuple.src.l3num, | |
312 | expect->tuple.dst.protonum)); | |
9fb9cbb1 YK |
313 | return seq_putc(s, '\n'); |
314 | } | |
315 | ||
316 | static struct seq_operations exp_seq_ops = { | |
317 | .start = exp_seq_start, | |
318 | .next = exp_seq_next, | |
319 | .stop = exp_seq_stop, | |
320 | .show = exp_seq_show | |
321 | }; | |
322 | ||
323 | static int exp_open(struct inode *inode, struct file *file) | |
324 | { | |
325 | return seq_open(file, &exp_seq_ops); | |
326 | } | |
327 | ||
328 | static struct file_operations exp_file_ops = { | |
329 | .owner = THIS_MODULE, | |
330 | .open = exp_open, | |
331 | .read = seq_read, | |
332 | .llseek = seq_lseek, | |
333 | .release = seq_release | |
334 | }; | |
335 | ||
336 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
337 | { | |
338 | int cpu; | |
339 | ||
340 | if (*pos == 0) | |
341 | return SEQ_START_TOKEN; | |
342 | ||
343 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
344 | if (!cpu_possible(cpu)) | |
345 | continue; | |
346 | *pos = cpu + 1; | |
347 | return &per_cpu(nf_conntrack_stat, cpu); | |
348 | } | |
349 | ||
350 | return NULL; | |
351 | } | |
352 | ||
353 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
354 | { | |
355 | int cpu; | |
356 | ||
357 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
358 | if (!cpu_possible(cpu)) | |
359 | continue; | |
360 | *pos = cpu + 1; | |
361 | return &per_cpu(nf_conntrack_stat, cpu); | |
362 | } | |
363 | ||
364 | return NULL; | |
365 | } | |
366 | ||
367 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) | |
368 | { | |
369 | } | |
370 | ||
371 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) | |
372 | { | |
373 | unsigned int nr_conntracks = atomic_read(&nf_conntrack_count); | |
374 | struct ip_conntrack_stat *st = v; | |
375 | ||
376 | if (v == SEQ_START_TOKEN) { | |
377 | 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"); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " | |
382 | "%08x %08x %08x %08x %08x %08x %08x %08x \n", | |
383 | nr_conntracks, | |
384 | st->searched, | |
385 | st->found, | |
386 | st->new, | |
387 | st->invalid, | |
388 | st->ignore, | |
389 | st->delete, | |
390 | st->delete_list, | |
391 | st->insert, | |
392 | st->insert_failed, | |
393 | st->drop, | |
394 | st->early_drop, | |
395 | st->error, | |
396 | ||
397 | st->expect_new, | |
398 | st->expect_create, | |
399 | st->expect_delete | |
400 | ); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static struct seq_operations ct_cpu_seq_ops = { | |
405 | .start = ct_cpu_seq_start, | |
406 | .next = ct_cpu_seq_next, | |
407 | .stop = ct_cpu_seq_stop, | |
408 | .show = ct_cpu_seq_show, | |
409 | }; | |
410 | ||
411 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) | |
412 | { | |
413 | return seq_open(file, &ct_cpu_seq_ops); | |
414 | } | |
415 | ||
416 | static struct file_operations ct_cpu_seq_fops = { | |
417 | .owner = THIS_MODULE, | |
418 | .open = ct_cpu_seq_open, | |
419 | .read = seq_read, | |
420 | .llseek = seq_lseek, | |
421 | .release = seq_release_private, | |
422 | }; | |
423 | #endif /* CONFIG_PROC_FS */ | |
424 | ||
425 | /* Sysctl support */ | |
426 | ||
427 | #ifdef CONFIG_SYSCTL | |
428 | ||
429 | /* From nf_conntrack_core.c */ | |
430 | extern int nf_conntrack_max; | |
431 | extern unsigned int nf_conntrack_htable_size; | |
432 | ||
433 | /* From nf_conntrack_proto_tcp.c */ | |
434 | extern unsigned long nf_ct_tcp_timeout_syn_sent; | |
435 | extern unsigned long nf_ct_tcp_timeout_syn_recv; | |
436 | extern unsigned long nf_ct_tcp_timeout_established; | |
437 | extern unsigned long nf_ct_tcp_timeout_fin_wait; | |
438 | extern unsigned long nf_ct_tcp_timeout_close_wait; | |
439 | extern unsigned long nf_ct_tcp_timeout_last_ack; | |
440 | extern unsigned long nf_ct_tcp_timeout_time_wait; | |
441 | extern unsigned long nf_ct_tcp_timeout_close; | |
442 | extern unsigned long nf_ct_tcp_timeout_max_retrans; | |
443 | extern int nf_ct_tcp_loose; | |
444 | extern int nf_ct_tcp_be_liberal; | |
445 | extern int nf_ct_tcp_max_retrans; | |
446 | ||
447 | /* From nf_conntrack_proto_udp.c */ | |
448 | extern unsigned long nf_ct_udp_timeout; | |
449 | extern unsigned long nf_ct_udp_timeout_stream; | |
450 | ||
451 | /* From nf_conntrack_proto_generic.c */ | |
452 | extern unsigned long nf_ct_generic_timeout; | |
453 | ||
454 | /* Log invalid packets of a given protocol */ | |
455 | static int log_invalid_proto_min = 0; | |
456 | static int log_invalid_proto_max = 255; | |
457 | ||
458 | static struct ctl_table_header *nf_ct_sysctl_header; | |
459 | ||
460 | static ctl_table nf_ct_sysctl_table[] = { | |
461 | { | |
462 | .ctl_name = NET_NF_CONNTRACK_MAX, | |
463 | .procname = "nf_conntrack_max", | |
464 | .data = &nf_conntrack_max, | |
465 | .maxlen = sizeof(int), | |
466 | .mode = 0644, | |
467 | .proc_handler = &proc_dointvec, | |
468 | }, | |
469 | { | |
470 | .ctl_name = NET_NF_CONNTRACK_COUNT, | |
471 | .procname = "nf_conntrack_count", | |
472 | .data = &nf_conntrack_count, | |
473 | .maxlen = sizeof(int), | |
474 | .mode = 0444, | |
475 | .proc_handler = &proc_dointvec, | |
476 | }, | |
477 | { | |
478 | .ctl_name = NET_NF_CONNTRACK_BUCKETS, | |
479 | .procname = "nf_conntrack_buckets", | |
480 | .data = &nf_conntrack_htable_size, | |
481 | .maxlen = sizeof(unsigned int), | |
482 | .mode = 0444, | |
483 | .proc_handler = &proc_dointvec, | |
484 | }, | |
485 | { | |
486 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
487 | .procname = "nf_conntrack_tcp_timeout_syn_sent", | |
488 | .data = &nf_ct_tcp_timeout_syn_sent, | |
489 | .maxlen = sizeof(unsigned int), | |
490 | .mode = 0644, | |
491 | .proc_handler = &proc_dointvec_jiffies, | |
492 | }, | |
493 | { | |
494 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
495 | .procname = "nf_conntrack_tcp_timeout_syn_recv", | |
496 | .data = &nf_ct_tcp_timeout_syn_recv, | |
497 | .maxlen = sizeof(unsigned int), | |
498 | .mode = 0644, | |
499 | .proc_handler = &proc_dointvec_jiffies, | |
500 | }, | |
501 | { | |
502 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
503 | .procname = "nf_conntrack_tcp_timeout_established", | |
504 | .data = &nf_ct_tcp_timeout_established, | |
505 | .maxlen = sizeof(unsigned int), | |
506 | .mode = 0644, | |
507 | .proc_handler = &proc_dointvec_jiffies, | |
508 | }, | |
509 | { | |
510 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
511 | .procname = "nf_conntrack_tcp_timeout_fin_wait", | |
512 | .data = &nf_ct_tcp_timeout_fin_wait, | |
513 | .maxlen = sizeof(unsigned int), | |
514 | .mode = 0644, | |
515 | .proc_handler = &proc_dointvec_jiffies, | |
516 | }, | |
517 | { | |
518 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
519 | .procname = "nf_conntrack_tcp_timeout_close_wait", | |
520 | .data = &nf_ct_tcp_timeout_close_wait, | |
521 | .maxlen = sizeof(unsigned int), | |
522 | .mode = 0644, | |
523 | .proc_handler = &proc_dointvec_jiffies, | |
524 | }, | |
525 | { | |
526 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
527 | .procname = "nf_conntrack_tcp_timeout_last_ack", | |
528 | .data = &nf_ct_tcp_timeout_last_ack, | |
529 | .maxlen = sizeof(unsigned int), | |
530 | .mode = 0644, | |
531 | .proc_handler = &proc_dointvec_jiffies, | |
532 | }, | |
533 | { | |
534 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
535 | .procname = "nf_conntrack_tcp_timeout_time_wait", | |
536 | .data = &nf_ct_tcp_timeout_time_wait, | |
537 | .maxlen = sizeof(unsigned int), | |
538 | .mode = 0644, | |
539 | .proc_handler = &proc_dointvec_jiffies, | |
540 | }, | |
541 | { | |
542 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
543 | .procname = "nf_conntrack_tcp_timeout_close", | |
544 | .data = &nf_ct_tcp_timeout_close, | |
545 | .maxlen = sizeof(unsigned int), | |
546 | .mode = 0644, | |
547 | .proc_handler = &proc_dointvec_jiffies, | |
548 | }, | |
549 | { | |
550 | .ctl_name = NET_NF_CONNTRACK_UDP_TIMEOUT, | |
551 | .procname = "nf_conntrack_udp_timeout", | |
552 | .data = &nf_ct_udp_timeout, | |
553 | .maxlen = sizeof(unsigned int), | |
554 | .mode = 0644, | |
555 | .proc_handler = &proc_dointvec_jiffies, | |
556 | }, | |
557 | { | |
558 | .ctl_name = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM, | |
559 | .procname = "nf_conntrack_udp_timeout_stream", | |
560 | .data = &nf_ct_udp_timeout_stream, | |
561 | .maxlen = sizeof(unsigned int), | |
562 | .mode = 0644, | |
563 | .proc_handler = &proc_dointvec_jiffies, | |
564 | }, | |
565 | { | |
566 | .ctl_name = NET_NF_CONNTRACK_GENERIC_TIMEOUT, | |
567 | .procname = "nf_conntrack_generic_timeout", | |
568 | .data = &nf_ct_generic_timeout, | |
569 | .maxlen = sizeof(unsigned int), | |
570 | .mode = 0644, | |
571 | .proc_handler = &proc_dointvec_jiffies, | |
572 | }, | |
573 | { | |
574 | .ctl_name = NET_NF_CONNTRACK_LOG_INVALID, | |
575 | .procname = "nf_conntrack_log_invalid", | |
576 | .data = &nf_ct_log_invalid, | |
577 | .maxlen = sizeof(unsigned int), | |
578 | .mode = 0644, | |
579 | .proc_handler = &proc_dointvec_minmax, | |
580 | .strategy = &sysctl_intvec, | |
581 | .extra1 = &log_invalid_proto_min, | |
582 | .extra2 = &log_invalid_proto_max, | |
583 | }, | |
584 | { | |
585 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
586 | .procname = "nf_conntrack_tcp_timeout_max_retrans", | |
587 | .data = &nf_ct_tcp_timeout_max_retrans, | |
588 | .maxlen = sizeof(unsigned int), | |
589 | .mode = 0644, | |
590 | .proc_handler = &proc_dointvec_jiffies, | |
591 | }, | |
592 | { | |
593 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
594 | .procname = "nf_conntrack_tcp_loose", | |
595 | .data = &nf_ct_tcp_loose, | |
596 | .maxlen = sizeof(unsigned int), | |
597 | .mode = 0644, | |
598 | .proc_handler = &proc_dointvec, | |
599 | }, | |
600 | { | |
601 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
602 | .procname = "nf_conntrack_tcp_be_liberal", | |
603 | .data = &nf_ct_tcp_be_liberal, | |
604 | .maxlen = sizeof(unsigned int), | |
605 | .mode = 0644, | |
606 | .proc_handler = &proc_dointvec, | |
607 | }, | |
608 | { | |
609 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
610 | .procname = "nf_conntrack_tcp_max_retrans", | |
611 | .data = &nf_ct_tcp_max_retrans, | |
612 | .maxlen = sizeof(unsigned int), | |
613 | .mode = 0644, | |
614 | .proc_handler = &proc_dointvec, | |
615 | }, | |
616 | ||
617 | { .ctl_name = 0 } | |
618 | }; | |
619 | ||
620 | #define NET_NF_CONNTRACK_MAX 2089 | |
621 | ||
622 | static ctl_table nf_ct_netfilter_table[] = { | |
623 | { | |
624 | .ctl_name = NET_NETFILTER, | |
625 | .procname = "netfilter", | |
626 | .mode = 0555, | |
627 | .child = nf_ct_sysctl_table, | |
628 | }, | |
629 | { | |
630 | .ctl_name = NET_NF_CONNTRACK_MAX, | |
631 | .procname = "nf_conntrack_max", | |
632 | .data = &nf_conntrack_max, | |
633 | .maxlen = sizeof(int), | |
634 | .mode = 0644, | |
635 | .proc_handler = &proc_dointvec, | |
636 | }, | |
637 | { .ctl_name = 0 } | |
638 | }; | |
639 | ||
640 | static ctl_table nf_ct_net_table[] = { | |
641 | { | |
642 | .ctl_name = CTL_NET, | |
643 | .procname = "net", | |
644 | .mode = 0555, | |
645 | .child = nf_ct_netfilter_table, | |
646 | }, | |
647 | { .ctl_name = 0 } | |
648 | }; | |
649 | EXPORT_SYMBOL(nf_ct_log_invalid); | |
650 | #endif /* CONFIG_SYSCTL */ | |
651 | ||
652 | static int init_or_cleanup(int init) | |
653 | { | |
654 | #ifdef CONFIG_PROC_FS | |
655 | struct proc_dir_entry *proc, *proc_exp, *proc_stat; | |
656 | #endif | |
657 | int ret = 0; | |
658 | ||
659 | if (!init) goto cleanup; | |
660 | ||
661 | ret = nf_conntrack_init(); | |
662 | if (ret < 0) | |
663 | goto cleanup_nothing; | |
664 | ||
665 | #ifdef CONFIG_PROC_FS | |
666 | proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops); | |
667 | if (!proc) goto cleanup_init; | |
668 | ||
669 | proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440, | |
670 | &exp_file_ops); | |
671 | if (!proc_exp) goto cleanup_proc; | |
672 | ||
673 | proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat); | |
674 | if (!proc_stat) | |
675 | goto cleanup_proc_exp; | |
676 | ||
677 | proc_stat->proc_fops = &ct_cpu_seq_fops; | |
678 | proc_stat->owner = THIS_MODULE; | |
679 | #endif | |
680 | #ifdef CONFIG_SYSCTL | |
681 | nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0); | |
682 | if (nf_ct_sysctl_header == NULL) { | |
683 | printk("nf_conntrack: can't register to sysctl.\n"); | |
684 | ret = -ENOMEM; | |
685 | goto cleanup_proc_stat; | |
686 | } | |
687 | #endif | |
688 | ||
689 | return ret; | |
690 | ||
691 | cleanup: | |
692 | #ifdef CONFIG_SYSCTL | |
693 | unregister_sysctl_table(nf_ct_sysctl_header); | |
694 | cleanup_proc_stat: | |
695 | #endif | |
696 | #ifdef CONFIG_PROC_FS | |
96479376 | 697 | remove_proc_entry("nf_conntrack", proc_net_stat); |
9fb9cbb1 YK |
698 | cleanup_proc_exp: |
699 | proc_net_remove("nf_conntrack_expect"); | |
700 | cleanup_proc: | |
701 | proc_net_remove("nf_conntrack"); | |
702 | cleanup_init: | |
703 | #endif /* CNFIG_PROC_FS */ | |
704 | nf_conntrack_cleanup(); | |
705 | cleanup_nothing: | |
706 | return ret; | |
707 | } | |
708 | ||
709 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) | |
710 | { | |
711 | int ret = 0; | |
712 | ||
713 | write_lock_bh(&nf_conntrack_lock); | |
714 | if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) { | |
715 | ret = -EBUSY; | |
716 | goto out; | |
717 | } | |
718 | nf_ct_l3protos[proto->l3proto] = proto; | |
719 | out: | |
720 | write_unlock_bh(&nf_conntrack_lock); | |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
725 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) | |
726 | { | |
727 | write_lock_bh(&nf_conntrack_lock); | |
728 | nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto; | |
729 | write_unlock_bh(&nf_conntrack_lock); | |
730 | ||
731 | /* Somebody could be still looking at the proto in bh. */ | |
732 | synchronize_net(); | |
733 | ||
734 | /* Remove all contrack entries for this protocol */ | |
735 | nf_ct_iterate_cleanup(kill_l3proto, proto); | |
736 | } | |
737 | ||
738 | /* FIXME: Allow NULL functions and sub in pointers to generic for | |
739 | them. --RR */ | |
740 | int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto) | |
741 | { | |
742 | int ret = 0; | |
743 | ||
744 | retry: | |
745 | write_lock_bh(&nf_conntrack_lock); | |
746 | if (nf_ct_protos[proto->l3proto]) { | |
747 | if (nf_ct_protos[proto->l3proto][proto->proto] | |
748 | != &nf_conntrack_generic_protocol) { | |
749 | ret = -EBUSY; | |
750 | goto out_unlock; | |
751 | } | |
752 | } else { | |
753 | /* l3proto may be loaded latter. */ | |
754 | struct nf_conntrack_protocol **proto_array; | |
755 | int i; | |
756 | ||
757 | write_unlock_bh(&nf_conntrack_lock); | |
758 | ||
759 | proto_array = (struct nf_conntrack_protocol **) | |
760 | kmalloc(MAX_NF_CT_PROTO * | |
761 | sizeof(struct nf_conntrack_protocol *), | |
762 | GFP_KERNEL); | |
763 | if (proto_array == NULL) { | |
764 | ret = -ENOMEM; | |
765 | goto out; | |
766 | } | |
767 | for (i = 0; i < MAX_NF_CT_PROTO; i++) | |
768 | proto_array[i] = &nf_conntrack_generic_protocol; | |
769 | ||
770 | write_lock_bh(&nf_conntrack_lock); | |
771 | if (nf_ct_protos[proto->l3proto]) { | |
772 | /* bad timing, but no problem */ | |
773 | write_unlock_bh(&nf_conntrack_lock); | |
774 | kfree(proto_array); | |
775 | } else { | |
776 | nf_ct_protos[proto->l3proto] = proto_array; | |
777 | write_unlock_bh(&nf_conntrack_lock); | |
778 | } | |
779 | ||
780 | /* | |
781 | * Just once because array is never freed until unloading | |
782 | * nf_conntrack.ko | |
783 | */ | |
784 | goto retry; | |
785 | } | |
786 | ||
787 | nf_ct_protos[proto->l3proto][proto->proto] = proto; | |
788 | ||
789 | out_unlock: | |
790 | write_unlock_bh(&nf_conntrack_lock); | |
791 | out: | |
792 | return ret; | |
793 | } | |
794 | ||
795 | void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto) | |
796 | { | |
797 | write_lock_bh(&nf_conntrack_lock); | |
798 | nf_ct_protos[proto->l3proto][proto->proto] | |
799 | = &nf_conntrack_generic_protocol; | |
800 | write_unlock_bh(&nf_conntrack_lock); | |
801 | ||
802 | /* Somebody could be still looking at the proto in bh. */ | |
803 | synchronize_net(); | |
804 | ||
805 | /* Remove all contrack entries for this protocol */ | |
806 | nf_ct_iterate_cleanup(kill_proto, proto); | |
807 | } | |
808 | ||
809 | static int __init init(void) | |
810 | { | |
811 | return init_or_cleanup(1); | |
812 | } | |
813 | ||
814 | static void __exit fini(void) | |
815 | { | |
816 | init_or_cleanup(0); | |
817 | } | |
818 | ||
819 | module_init(init); | |
820 | module_exit(fini); | |
821 | ||
822 | /* Some modules need us, but don't depend directly on any symbol. | |
823 | They should call this. */ | |
824 | void need_nf_conntrack(void) | |
825 | { | |
826 | } | |
827 | ||
828 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
829 | EXPORT_SYMBOL_GPL(nf_conntrack_chain); | |
830 | EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain); | |
831 | EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier); | |
832 | EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier); | |
833 | EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init); | |
834 | EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache); | |
835 | EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events); | |
836 | #endif | |
837 | EXPORT_SYMBOL(nf_conntrack_l3proto_register); | |
838 | EXPORT_SYMBOL(nf_conntrack_l3proto_unregister); | |
839 | EXPORT_SYMBOL(nf_conntrack_protocol_register); | |
840 | EXPORT_SYMBOL(nf_conntrack_protocol_unregister); | |
841 | EXPORT_SYMBOL(nf_ct_invert_tuplepr); | |
842 | EXPORT_SYMBOL(nf_conntrack_alter_reply); | |
843 | EXPORT_SYMBOL(nf_conntrack_destroyed); | |
844 | EXPORT_SYMBOL(need_nf_conntrack); | |
845 | EXPORT_SYMBOL(nf_conntrack_helper_register); | |
846 | EXPORT_SYMBOL(nf_conntrack_helper_unregister); | |
847 | EXPORT_SYMBOL(nf_ct_iterate_cleanup); | |
848 | EXPORT_SYMBOL(__nf_ct_refresh_acct); | |
849 | EXPORT_SYMBOL(nf_ct_protos); | |
c1d10adb PNA |
850 | EXPORT_SYMBOL(__nf_ct_proto_find); |
851 | EXPORT_SYMBOL(nf_ct_proto_find_get); | |
852 | EXPORT_SYMBOL(nf_ct_proto_put); | |
853 | EXPORT_SYMBOL(nf_ct_l3proto_find_get); | |
854 | EXPORT_SYMBOL(nf_ct_l3proto_put); | |
9fb9cbb1 YK |
855 | EXPORT_SYMBOL(nf_ct_l3protos); |
856 | EXPORT_SYMBOL(nf_conntrack_expect_alloc); | |
857 | EXPORT_SYMBOL(nf_conntrack_expect_put); | |
858 | EXPORT_SYMBOL(nf_conntrack_expect_related); | |
859 | EXPORT_SYMBOL(nf_conntrack_unexpect_related); | |
860 | EXPORT_SYMBOL(nf_conntrack_tuple_taken); | |
861 | EXPORT_SYMBOL(nf_conntrack_htable_size); | |
862 | EXPORT_SYMBOL(nf_conntrack_lock); | |
863 | EXPORT_SYMBOL(nf_conntrack_hash); | |
864 | EXPORT_SYMBOL(nf_conntrack_untracked); | |
865 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); | |
866 | #ifdef CONFIG_IP_NF_NAT_NEEDED | |
867 | EXPORT_SYMBOL(nf_conntrack_tcp_update); | |
868 | #endif | |
869 | EXPORT_SYMBOL(__nf_conntrack_confirm); | |
870 | EXPORT_SYMBOL(nf_ct_get_tuple); | |
871 | EXPORT_SYMBOL(nf_ct_invert_tuple); | |
872 | EXPORT_SYMBOL(nf_conntrack_in); | |
873 | EXPORT_SYMBOL(__nf_conntrack_attach); | |
c1d10adb PNA |
874 | EXPORT_SYMBOL(nf_conntrack_alloc); |
875 | EXPORT_SYMBOL(nf_conntrack_free); | |
876 | EXPORT_SYMBOL(nf_conntrack_flush); | |
877 | EXPORT_SYMBOL(nf_ct_remove_expectations); | |
878 | EXPORT_SYMBOL(nf_ct_helper_find_get); | |
879 | EXPORT_SYMBOL(nf_ct_helper_put); | |
880 | EXPORT_SYMBOL(__nf_conntrack_helper_find_byname); | |
881 | EXPORT_SYMBOL(__nf_conntrack_find); | |
882 | EXPORT_SYMBOL(nf_ct_unlink_expect); | |
883 | EXPORT_SYMBOL(nf_conntrack_hash_insert); | |
884 | EXPORT_SYMBOL(__nf_conntrack_expect_find); | |
885 | EXPORT_SYMBOL(nf_conntrack_expect_find); | |
886 | EXPORT_SYMBOL(nf_conntrack_expect_list); | |
887 | #if defined(CONFIG_NF_CT_NETLINK) || \ | |
888 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
889 | EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr); | |
890 | EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple); | |
891 | #endif |