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[NETFILTER]: Fix NAT sequence number adjustment
[linux-2.6-block.git] / net / ipv4 / netfilter / ip_conntrack_standalone.c
CommitLineData
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
46MODULE_LICENSE("GPL");
47
48extern atomic_t ip_conntrack_count;
49DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
50
51static 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
58static int
59print_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
68static unsigned int
69seq_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
80struct ct_iter_state {
81 unsigned int bucket;
82};
83
84static 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
97static 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
110static 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
120static 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
126static 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
132static void ct_seq_stop(struct seq_file *s, void *v)
133{
134 READ_UNLOCK(&ip_conntrack_lock);
135}
136
137static 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
198static 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
205static 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;
221out_free:
222 kfree(st);
223 return ret;
224}
225
226static 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 */
235static 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
255static 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
267static void exp_seq_stop(struct seq_file *s, void *v)
268{
269 READ_UNLOCK(&ip_conntrack_lock);
270}
271
272static 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
289static 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
296static int exp_open(struct inode *inode, struct file *file)
297{
298 return seq_open(file, &exp_seq_ops);
299}
300
301static 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
309static 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
326static 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
340static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
341{
342}
343
344static 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
377static 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
384static int ct_cpu_seq_open(struct inode *inode, struct file *file)
385{
386 return seq_open(file, &ct_cpu_seq_ops);
387}
388
389static 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
398static 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 *))
e281e3ac
PM		 403{
404 /* We've seen it coming out the other side: confirm it */
405 return ip_conntrack_confirm(pskb);
406}
407
408static unsigned int ip_conntrack_help(unsigned int hooknum,
409 struct sk_buff **pskb,
410 const struct net_device *in,
411 const struct net_device *out,
412 int (*okfn)(struct sk_buff *))
1da177e4
LT		 413{
414 struct ip_conntrack *ct;
415 enum ip_conntrack_info ctinfo;
416
417 /* This is where we call the helper: as the packet goes out. */
418 ct = ip_conntrack_get(*pskb, &ctinfo);
419 if (ct && ct->helper) {
420 unsigned int ret;
421 ret = ct->helper->help(pskb, ct, ctinfo);
422 if (ret != NF_ACCEPT)
423 return ret;
424 }
e281e3ac 425 return NF_ACCEPT;
1da177e4
LT		 426}
427
428static unsigned int ip_conntrack_defrag(unsigned int hooknum,
429 struct sk_buff **pskb,
430 const struct net_device *in,
431 const struct net_device *out,
432 int (*okfn)(struct sk_buff *))
433{
434#if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
435 /* Previously seen (loopback)? Ignore. Do this before
436 fragment check. */
437 if ((*pskb)->nfct)
438 return NF_ACCEPT;
439#endif
440
441 /* Gather fragments. */
442 if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
443 *pskb = ip_ct_gather_frags(*pskb,
444 hooknum == NF_IP_PRE_ROUTING ?
445 IP_DEFRAG_CONNTRACK_IN :
446 IP_DEFRAG_CONNTRACK_OUT);
447 if (!*pskb)
448 return NF_STOLEN;
449 }
450 return NF_ACCEPT;
451}
452
453static unsigned int ip_refrag(unsigned int hooknum,
454 struct sk_buff **pskb,
455 const struct net_device *in,
456 const struct net_device *out,
457 int (*okfn)(struct sk_buff *))
458{
459 struct rtable *rt = (struct rtable *)(*pskb)->dst;
460
461 /* We've seen it coming out the other side: confirm */
462 if (ip_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT)
463 return NF_DROP;
464
465 /* Local packets are never produced too large for their
466 interface. We degfragment them at LOCAL_OUT, however,
467 so we have to refragment them here. */
468 if ((*pskb)->len > dst_mtu(&rt->u.dst) &&
469 !skb_shinfo(*pskb)->tso_size) {
470 /* No hook can be after us, so this should be OK. */
471 ip_fragment(*pskb, okfn);
472 return NF_STOLEN;
473 }
474 return NF_ACCEPT;
475}
476
477static unsigned int ip_conntrack_local(unsigned int hooknum,
478 struct sk_buff **pskb,
479 const struct net_device *in,
480 const struct net_device *out,
481 int (*okfn)(struct sk_buff *))
482{
483 /* root is playing with raw sockets. */
484 if ((*pskb)->len < sizeof(struct iphdr)
485 || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
486 if (net_ratelimit())
487 printk("ipt_hook: happy cracking.\n");
488 return NF_ACCEPT;
489 }
490 return ip_conntrack_in(hooknum, pskb, in, out, okfn);
491}
492
493/* Connection tracking may drop packets, but never alters them, so
494 make it the first hook. */
495static struct nf_hook_ops ip_conntrack_defrag_ops = {
496 .hook = ip_conntrack_defrag,
497 .owner = THIS_MODULE,
498 .pf = PF_INET,
499 .hooknum = NF_IP_PRE_ROUTING,
500 .priority = NF_IP_PRI_CONNTRACK_DEFRAG,
501};
502
503static struct nf_hook_ops ip_conntrack_in_ops = {
504 .hook = ip_conntrack_in,
505 .owner = THIS_MODULE,
506 .pf = PF_INET,
507 .hooknum = NF_IP_PRE_ROUTING,
508 .priority = NF_IP_PRI_CONNTRACK,
509};
510
511static struct nf_hook_ops ip_conntrack_defrag_local_out_ops = {
512 .hook = ip_conntrack_defrag,
513 .owner = THIS_MODULE,
514 .pf = PF_INET,
515 .hooknum = NF_IP_LOCAL_OUT,
516 .priority = NF_IP_PRI_CONNTRACK_DEFRAG,
517};
518
519static struct nf_hook_ops ip_conntrack_local_out_ops = {
520 .hook = ip_conntrack_local,
521 .owner = THIS_MODULE,
522 .pf = PF_INET,
523 .hooknum = NF_IP_LOCAL_OUT,
524 .priority = NF_IP_PRI_CONNTRACK,
525};
526
e281e3ac
PM		 527/* helpers */
528static struct nf_hook_ops ip_conntrack_helper_out_ops = {
529 .hook = ip_conntrack_help,
530 .owner = THIS_MODULE,
531 .pf = PF_INET,
532 .hooknum = NF_IP_POST_ROUTING,
533 .priority = NF_IP_PRI_CONNTRACK_HELPER,
534};
535
536static struct nf_hook_ops ip_conntrack_helper_in_ops = {
537 .hook = ip_conntrack_help,
538 .owner = THIS_MODULE,
539 .pf = PF_INET,
540 .hooknum = NF_IP_LOCAL_IN,
541 .priority = NF_IP_PRI_CONNTRACK_HELPER,
542};
543
1da177e4
LT		 544/* Refragmenter; last chance. */
545static struct nf_hook_ops ip_conntrack_out_ops = {
546 .hook = ip_refrag,
547 .owner = THIS_MODULE,
548 .pf = PF_INET,
549 .hooknum = NF_IP_POST_ROUTING,
e281e3ac 550 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
1da177e4
LT		 551};
552
553static struct nf_hook_ops ip_conntrack_local_in_ops = {
554 .hook = ip_confirm,
555 .owner = THIS_MODULE,
556 .pf = PF_INET,
557 .hooknum = NF_IP_LOCAL_IN,
e281e3ac 558 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
1da177e4
LT		 559};
560
561/* Sysctl support */
562
563#ifdef CONFIG_SYSCTL
564
565/* From ip_conntrack_core.c */
566extern int ip_conntrack_max;
567extern unsigned int ip_conntrack_htable_size;
568
569/* From ip_conntrack_proto_tcp.c */
570extern unsigned long ip_ct_tcp_timeout_syn_sent;
571extern unsigned long ip_ct_tcp_timeout_syn_recv;
572extern unsigned long ip_ct_tcp_timeout_established;
573extern unsigned long ip_ct_tcp_timeout_fin_wait;
574extern unsigned long ip_ct_tcp_timeout_close_wait;
575extern unsigned long ip_ct_tcp_timeout_last_ack;
576extern unsigned long ip_ct_tcp_timeout_time_wait;
577extern unsigned long ip_ct_tcp_timeout_close;
578extern unsigned long ip_ct_tcp_timeout_max_retrans;
579extern int ip_ct_tcp_loose;
580extern int ip_ct_tcp_be_liberal;
581extern int ip_ct_tcp_max_retrans;
582
583/* From ip_conntrack_proto_udp.c */
584extern unsigned long ip_ct_udp_timeout;
585extern unsigned long ip_ct_udp_timeout_stream;
586
587/* From ip_conntrack_proto_icmp.c */
588extern unsigned long ip_ct_icmp_timeout;
589
590/* From ip_conntrack_proto_icmp.c */
591extern unsigned long ip_ct_generic_timeout;
592
593/* Log invalid packets of a given protocol */
594static int log_invalid_proto_min = 0;
595static int log_invalid_proto_max = 255;
596
597static struct ctl_table_header *ip_ct_sysctl_header;
598
599static ctl_table ip_ct_sysctl_table[] = {
600 {
601 .ctl_name = NET_IPV4_NF_CONNTRACK_MAX,
602 .procname = "ip_conntrack_max",
603 .data = &ip_conntrack_max,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec,
607 },
608 {
609 .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT,
610 .procname = "ip_conntrack_count",
611 .data = &ip_conntrack_count,
612 .maxlen = sizeof(int),
613 .mode = 0444,
614 .proc_handler = &proc_dointvec,
615 },
616 {
617 .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS,
618 .procname = "ip_conntrack_buckets",
619 .data = &ip_conntrack_htable_size,
620 .maxlen = sizeof(unsigned int),
621 .mode = 0444,
622 .proc_handler = &proc_dointvec,
623 },
624 {
625 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
626 .procname = "ip_conntrack_tcp_timeout_syn_sent",
627 .data = &ip_ct_tcp_timeout_syn_sent,
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_SYN_RECV,
634 .procname = "ip_conntrack_tcp_timeout_syn_recv",
635 .data = &ip_ct_tcp_timeout_syn_recv,
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_ESTABLISHED,
642 .procname = "ip_conntrack_tcp_timeout_established",
643 .data = &ip_ct_tcp_timeout_established,
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_FIN_WAIT,
650 .procname = "ip_conntrack_tcp_timeout_fin_wait",
651 .data = &ip_ct_tcp_timeout_fin_wait,
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_CLOSE_WAIT,
658 .procname = "ip_conntrack_tcp_timeout_close_wait",
659 .data = &ip_ct_tcp_timeout_close_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_LAST_ACK,
666 .procname = "ip_conntrack_tcp_timeout_last_ack",
667 .data = &ip_ct_tcp_timeout_last_ack,
668 .maxlen = sizeof(unsigned int),
669 .mode = 0644,
670 .proc_handler = &proc_dointvec_jiffies,
671 },
672 {
673 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
674 .procname = "ip_conntrack_tcp_timeout_time_wait",
675 .data = &ip_ct_tcp_timeout_time_wait,
676 .maxlen = sizeof(unsigned int),
677 .mode = 0644,
678 .proc_handler = &proc_dointvec_jiffies,
679 },
680 {
681 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
682 .procname = "ip_conntrack_tcp_timeout_close",
683 .data = &ip_ct_tcp_timeout_close,
684 .maxlen = sizeof(unsigned int),
685 .mode = 0644,
686 .proc_handler = &proc_dointvec_jiffies,
687 },
688 {
689 .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
690 .procname = "ip_conntrack_udp_timeout",
691 .data = &ip_ct_udp_timeout,
692 .maxlen = sizeof(unsigned int),
693 .mode = 0644,
694 .proc_handler = &proc_dointvec_jiffies,
695 },
696 {
697 .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
698 .procname = "ip_conntrack_udp_timeout_stream",
699 .data = &ip_ct_udp_timeout_stream,
700 .maxlen = sizeof(unsigned int),
701 .mode = 0644,
702 .proc_handler = &proc_dointvec_jiffies,
703 },
704 {
705 .ctl_name = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
706 .procname = "ip_conntrack_icmp_timeout",
707 .data = &ip_ct_icmp_timeout,
708 .maxlen = sizeof(unsigned int),
709 .mode = 0644,
710 .proc_handler = &proc_dointvec_jiffies,
711 },
712 {
713 .ctl_name = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
714 .procname = "ip_conntrack_generic_timeout",
715 .data = &ip_ct_generic_timeout,
716 .maxlen = sizeof(unsigned int),
717 .mode = 0644,
718 .proc_handler = &proc_dointvec_jiffies,
719 },
720 {
721 .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
722 .procname = "ip_conntrack_log_invalid",
723 .data = &ip_ct_log_invalid,
724 .maxlen = sizeof(unsigned int),
725 .mode = 0644,
726 .proc_handler = &proc_dointvec_minmax,
727 .strategy = &sysctl_intvec,
728 .extra1 = &log_invalid_proto_min,
729 .extra2 = &log_invalid_proto_max,
730 },
731 {
732 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
733 .procname = "ip_conntrack_tcp_timeout_max_retrans",
734 .data = &ip_ct_tcp_timeout_max_retrans,
735 .maxlen = sizeof(unsigned int),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec_jiffies,
738 },
739 {
740 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
741 .procname = "ip_conntrack_tcp_loose",
742 .data = &ip_ct_tcp_loose,
743 .maxlen = sizeof(unsigned int),
744 .mode = 0644,
745 .proc_handler = &proc_dointvec,
746 },
747 {
748 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
749 .procname = "ip_conntrack_tcp_be_liberal",
750 .data = &ip_ct_tcp_be_liberal,
751 .maxlen = sizeof(unsigned int),
752 .mode = 0644,
753 .proc_handler = &proc_dointvec,
754 },
755 {
756 .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
757 .procname = "ip_conntrack_tcp_max_retrans",
758 .data = &ip_ct_tcp_max_retrans,
759 .maxlen = sizeof(unsigned int),
760 .mode = 0644,
761 .proc_handler = &proc_dointvec,
762 },
763 { .ctl_name = 0 }
764};
765
766#define NET_IP_CONNTRACK_MAX 2089
767
768static ctl_table ip_ct_netfilter_table[] = {
769 {
770 .ctl_name = NET_IPV4_NETFILTER,
771 .procname = "netfilter",
772 .mode = 0555,
773 .child = ip_ct_sysctl_table,
774 },
775 {
776 .ctl_name = NET_IP_CONNTRACK_MAX,
777 .procname = "ip_conntrack_max",
778 .data = &ip_conntrack_max,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = &proc_dointvec
782 },
783 { .ctl_name = 0 }
784};
785
786static ctl_table ip_ct_ipv4_table[] = {
787 {
788 .ctl_name = NET_IPV4,
789 .procname = "ipv4",
790 .mode = 0555,
791 .child = ip_ct_netfilter_table,
792 },
793 { .ctl_name = 0 }
794};
795
796static ctl_table ip_ct_net_table[] = {
797 {
798 .ctl_name = CTL_NET,
799 .procname = "net",
800 .mode = 0555,
801 .child = ip_ct_ipv4_table,
802 },
803 { .ctl_name = 0 }
804};
805
806EXPORT_SYMBOL(ip_ct_log_invalid);
807#endif /* CONFIG_SYSCTL */
808
809static int init_or_cleanup(int init)
810{
811#ifdef CONFIG_PROC_FS
812 struct proc_dir_entry *proc, *proc_exp, *proc_stat;
813#endif
814 int ret = 0;
815
816 if (!init) goto cleanup;
817
818 ret = ip_conntrack_init();
819 if (ret < 0)
820 goto cleanup_nothing;
821
822#ifdef CONFIG_PROC_FS
823 ret = -ENOMEM;
824 proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
825 if (!proc) goto cleanup_init;
826
827 proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
828 &exp_file_ops);
829 if (!proc_exp) goto cleanup_proc;
830
831 proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
832 if (!proc_stat)
833 goto cleanup_proc_exp;
834
835 proc_stat->proc_fops = &ct_cpu_seq_fops;
836 proc_stat->owner = THIS_MODULE;
837#endif
838
839 ret = nf_register_hook(&ip_conntrack_defrag_ops);
840 if (ret < 0) {
841 printk("ip_conntrack: can't register pre-routing defrag hook.\n");
842 goto cleanup_proc_stat;
843 }
844 ret = nf_register_hook(&ip_conntrack_defrag_local_out_ops);
845 if (ret < 0) {
846 printk("ip_conntrack: can't register local_out defrag hook.\n");
847 goto cleanup_defragops;
848 }
849 ret = nf_register_hook(&ip_conntrack_in_ops);
850 if (ret < 0) {
851 printk("ip_conntrack: can't register pre-routing hook.\n");
852 goto cleanup_defraglocalops;
853 }
854 ret = nf_register_hook(&ip_conntrack_local_out_ops);
855 if (ret < 0) {
856 printk("ip_conntrack: can't register local out hook.\n");
857 goto cleanup_inops;
858 }
e281e3ac
PM		 859 ret = nf_register_hook(&ip_conntrack_helper_in_ops);
860 if (ret < 0) {
861 printk("ip_conntrack: can't register local in helper hook.\n");
862 goto cleanup_inandlocalops;
863 }
864 ret = nf_register_hook(&ip_conntrack_helper_out_ops);
865 if (ret < 0) {
866 printk("ip_conntrack: can't register postrouting helper hook.\n");
867 goto cleanup_helperinops;
868 }
1da177e4
LT		 869 ret = nf_register_hook(&ip_conntrack_out_ops);
870 if (ret < 0) {
871 printk("ip_conntrack: can't register post-routing hook.\n");
e281e3ac 872 goto cleanup_helperoutops;
1da177e4
LT		 873 }
874 ret = nf_register_hook(&ip_conntrack_local_in_ops);
875 if (ret < 0) {
876 printk("ip_conntrack: can't register local in hook.\n");
877 goto cleanup_inoutandlocalops;
878 }
879#ifdef CONFIG_SYSCTL
880 ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
881 if (ip_ct_sysctl_header == NULL) {
882 printk("ip_conntrack: can't register to sysctl.\n");
883 ret = -ENOMEM;
884 goto cleanup_localinops;
885 }
886#endif
887
888 return ret;
889
890 cleanup:
891#ifdef CONFIG_SYSCTL
892 unregister_sysctl_table(ip_ct_sysctl_header);
893 cleanup_localinops:
894#endif
895 nf_unregister_hook(&ip_conntrack_local_in_ops);
896 cleanup_inoutandlocalops:
897 nf_unregister_hook(&ip_conntrack_out_ops);
e281e3ac
PM		 898 cleanup_helperoutops:
899 nf_unregister_hook(&ip_conntrack_helper_out_ops);
900 cleanup_helperinops:
901 nf_unregister_hook(&ip_conntrack_helper_in_ops);
1da177e4
LT		 902 cleanup_inandlocalops:
903 nf_unregister_hook(&ip_conntrack_local_out_ops);
904 cleanup_inops:
905 nf_unregister_hook(&ip_conntrack_in_ops);
906 cleanup_defraglocalops:
907 nf_unregister_hook(&ip_conntrack_defrag_local_out_ops);
908 cleanup_defragops:
909 nf_unregister_hook(&ip_conntrack_defrag_ops);
910 cleanup_proc_stat:
911#ifdef CONFIG_PROC_FS
912 remove_proc_entry("ip_conntrack", proc_net_stat);
913 cleanup_proc_exp:
914 proc_net_remove("ip_conntrack_expect");
915 cleanup_proc:
916 proc_net_remove("ip_conntrack");
917 cleanup_init:
918#endif /* CONFIG_PROC_FS */
919 ip_conntrack_cleanup();
920 cleanup_nothing:
921 return ret;
922}
923
924/* FIXME: Allow NULL functions and sub in pointers to generic for
925 them. --RR */
926int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
927{
928 int ret = 0;
929
930 WRITE_LOCK(&ip_conntrack_lock);
931 if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
932 ret = -EBUSY;
933 goto out;
934 }
935 ip_ct_protos[proto->proto] = proto;
936 out:
937 WRITE_UNLOCK(&ip_conntrack_lock);
938 return ret;
939}
940
941void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
942{
943 WRITE_LOCK(&ip_conntrack_lock);
944 ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
945 WRITE_UNLOCK(&ip_conntrack_lock);
946
947 /* Somebody could be still looking at the proto in bh. */
948 synchronize_net();
949
950 /* Remove all contrack entries for this protocol */
951 ip_ct_iterate_cleanup(kill_proto, &proto->proto);
952}
953
954static int __init init(void)
955{
956 return init_or_cleanup(1);
957}
958
959static void __exit fini(void)
960{
961 init_or_cleanup(0);
962}
963
964module_init(init);
965module_exit(fini);
966
967/* Some modules need us, but don't depend directly on any symbol.
968 They should call this. */
969void need_ip_conntrack(void)
970{
971}
972
973EXPORT_SYMBOL(ip_conntrack_protocol_register);
974EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
975EXPORT_SYMBOL(ip_ct_get_tuple);
976EXPORT_SYMBOL(invert_tuplepr);
977EXPORT_SYMBOL(ip_conntrack_alter_reply);
978EXPORT_SYMBOL(ip_conntrack_destroyed);
979EXPORT_SYMBOL(need_ip_conntrack);
980EXPORT_SYMBOL(ip_conntrack_helper_register);
981EXPORT_SYMBOL(ip_conntrack_helper_unregister);
982EXPORT_SYMBOL(ip_ct_iterate_cleanup);
983EXPORT_SYMBOL(ip_ct_refresh_acct);
984EXPORT_SYMBOL(ip_ct_protos);
985EXPORT_SYMBOL(ip_ct_find_proto);
986EXPORT_SYMBOL(ip_conntrack_expect_alloc);
987EXPORT_SYMBOL(ip_conntrack_expect_free);
988EXPORT_SYMBOL(ip_conntrack_expect_related);
989EXPORT_SYMBOL(ip_conntrack_unexpect_related);
990EXPORT_SYMBOL(ip_conntrack_tuple_taken);
991EXPORT_SYMBOL(ip_ct_gather_frags);
992EXPORT_SYMBOL(ip_conntrack_htable_size);
993EXPORT_SYMBOL(ip_conntrack_lock);
994EXPORT_SYMBOL(ip_conntrack_hash);
995EXPORT_SYMBOL(ip_conntrack_untracked);
996EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
997EXPORT_SYMBOL_GPL(ip_conntrack_put);
998#ifdef CONFIG_IP_NF_NAT_NEEDED
999EXPORT_SYMBOL(ip_conntrack_tcp_update);
1000#endif
Linux 6.x block layer and io_uring tree(s)