[NETFILTER]: Fix timeout sysctls on big-endian 64bit architectures
[linux-2.6.git] / net / ipv4 / netfilter / ip_conntrack_standalone.c
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) 2002-2005 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 #include <net/route.h>
31
32 #define ASSERT_READ_LOCK(x)
33 #define ASSERT_WRITE_LOCK(x)
34
35 #include <linux/netfilter_ipv4/ip_conntrack.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
37 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
38 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
39 #include <linux/netfilter_ipv4/listhelp.h>
40
41 #if 0
42 #define DEBUGP printk
43 #else
44 #define DEBUGP(format, args...)
45 #endif
46
47 MODULE_LICENSE("GPL");
48
49 extern atomic_t ip_conntrack_count;
50 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
51
52 static int kill_proto(struct ip_conntrack *i, void *data)
53 {
54         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == 
55                         *((u_int8_t *) data));
56 }
57
58 #ifdef CONFIG_PROC_FS
59 static int
60 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
61             struct ip_conntrack_protocol *proto)
62 {
63         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
64                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
65         return proto->print_tuple(s, tuple);
66 }
67
68 #ifdef CONFIG_IP_NF_CT_ACCT
69 static unsigned int
70 seq_print_counters(struct seq_file *s,
71                    const struct ip_conntrack_counter *counter)
72 {
73         return seq_printf(s, "packets=%llu bytes=%llu ",
74                           (unsigned long long)counter->packets,
75                           (unsigned long long)counter->bytes);
76 }
77 #else
78 #define seq_print_counters(x, y)        0
79 #endif
80
81 struct ct_iter_state {
82         unsigned int bucket;
83 };
84
85 static struct list_head *ct_get_first(struct seq_file *seq)
86 {
87         struct ct_iter_state *st = seq->private;
88
89         for (st->bucket = 0;
90              st->bucket < ip_conntrack_htable_size;
91              st->bucket++) {
92                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
93                         return ip_conntrack_hash[st->bucket].next;
94         }
95         return NULL;
96 }
97
98 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
99 {
100         struct ct_iter_state *st = seq->private;
101
102         head = head->next;
103         while (head == &ip_conntrack_hash[st->bucket]) {
104                 if (++st->bucket >= ip_conntrack_htable_size)
105                         return NULL;
106                 head = ip_conntrack_hash[st->bucket].next;
107         }
108         return head;
109 }
110
111 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
112 {
113         struct list_head *head = ct_get_first(seq);
114
115         if (head)
116                 while (pos && (head = ct_get_next(seq, head)))
117                         pos--;
118         return pos ? NULL : head;
119 }
120
121 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
122 {
123         read_lock_bh(&ip_conntrack_lock);
124         return ct_get_idx(seq, *pos);
125 }
126
127 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
128 {
129         (*pos)++;
130         return ct_get_next(s, v);
131 }
132   
133 static void ct_seq_stop(struct seq_file *s, void *v)
134 {
135         read_unlock_bh(&ip_conntrack_lock);
136 }
137  
138 static int ct_seq_show(struct seq_file *s, void *v)
139 {
140         const struct ip_conntrack_tuple_hash *hash = v;
141         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
142         struct ip_conntrack_protocol *proto;
143
144         ASSERT_READ_LOCK(&ip_conntrack_lock);
145         IP_NF_ASSERT(conntrack);
146
147         /* we only want to print DIR_ORIGINAL */
148         if (DIRECTION(hash))
149                 return 0;
150
151         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].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=%u ", 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_bh(&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         ++*pos;
260         e = e->next;
261
262         if (e == &ip_conntrack_expect_list)
263                 return NULL;
264
265         return e;
266 }
267
268 static void exp_seq_stop(struct seq_file *s, void *v)
269 {
270         read_unlock_bh(&ip_conntrack_lock);
271 }
272
273 static int exp_seq_show(struct seq_file *s, void *v)
274 {
275         struct ip_conntrack_expect *expect = v;
276
277         if (expect->timeout.function)
278                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
279                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
280         else
281                 seq_printf(s, "- ");
282
283         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
284
285         print_tuple(s, &expect->tuple,
286                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
287         return seq_putc(s, '\n');
288 }
289
290 static struct seq_operations exp_seq_ops = {
291         .start = exp_seq_start,
292         .next = exp_seq_next,
293         .stop = exp_seq_stop,
294         .show = exp_seq_show
295 };
296
297 static int exp_open(struct inode *inode, struct file *file)
298 {
299         return seq_open(file, &exp_seq_ops);
300 }
301   
302 static struct file_operations exp_file_ops = {
303         .owner   = THIS_MODULE,
304         .open    = exp_open,
305         .read    = seq_read,
306         .llseek  = seq_lseek,
307         .release = seq_release
308 };
309
310 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
311 {
312         int cpu;
313
314         if (*pos == 0)
315                 return SEQ_START_TOKEN;
316
317         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
318                 if (!cpu_possible(cpu))
319                         continue;
320                 *pos = cpu+1;
321                 return &per_cpu(ip_conntrack_stat, cpu);
322         }
323
324         return NULL;
325 }
326
327 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
328 {
329         int cpu;
330
331         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
332                 if (!cpu_possible(cpu))
333                         continue;
334                 *pos = cpu+1;
335                 return &per_cpu(ip_conntrack_stat, cpu);
336         }
337
338         return NULL;
339 }
340
341 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
342 {
343 }
344
345 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
346 {
347         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
348         struct ip_conntrack_stat *st = v;
349
350         if (v == SEQ_START_TOKEN) {
351                 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");
352                 return 0;
353         }
354
355         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
356                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
357                    nr_conntracks,
358                    st->searched,
359                    st->found,
360                    st->new,
361                    st->invalid,
362                    st->ignore,
363                    st->delete,
364                    st->delete_list,
365                    st->insert,
366                    st->insert_failed,
367                    st->drop,
368                    st->early_drop,
369                    st->error,
370
371                    st->expect_new,
372                    st->expect_create,
373                    st->expect_delete
374                 );
375         return 0;
376 }
377
378 static struct seq_operations ct_cpu_seq_ops = {
379         .start  = ct_cpu_seq_start,
380         .next   = ct_cpu_seq_next,
381         .stop   = ct_cpu_seq_stop,
382         .show   = ct_cpu_seq_show,
383 };
384
385 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
386 {
387         return seq_open(file, &ct_cpu_seq_ops);
388 }
389
390 static struct file_operations ct_cpu_seq_fops = {
391         .owner   = THIS_MODULE,
392         .open    = ct_cpu_seq_open,
393         .read    = seq_read,
394         .llseek  = seq_lseek,
395         .release = seq_release_private,
396 };
397 #endif
398
399 static unsigned int ip_confirm(unsigned int hooknum,
400                                struct sk_buff **pskb,
401                                const struct net_device *in,
402                                const struct net_device *out,
403                                int (*okfn)(struct sk_buff *))
404 {
405         /* We've seen it coming out the other side: confirm it */
406         return ip_conntrack_confirm(pskb);
407 }
408
409 static unsigned int ip_conntrack_help(unsigned int hooknum,
410                                       struct sk_buff **pskb,
411                                       const struct net_device *in,
412                                       const struct net_device *out,
413                                       int (*okfn)(struct sk_buff *))
414 {
415         struct ip_conntrack *ct;
416         enum ip_conntrack_info ctinfo;
417
418         /* This is where we call the helper: as the packet goes out. */
419         ct = ip_conntrack_get(*pskb, &ctinfo);
420         if (ct && ct->helper) {
421                 unsigned int ret;
422                 ret = ct->helper->help(pskb, ct, ctinfo);
423                 if (ret != NF_ACCEPT)
424                         return ret;
425         }
426         return NF_ACCEPT;
427 }
428
429 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
430                                         struct sk_buff **pskb,
431                                         const struct net_device *in,
432                                         const struct net_device *out,
433                                         int (*okfn)(struct sk_buff *))
434 {
435 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
436         /* Previously seen (loopback)?  Ignore.  Do this before
437            fragment check. */
438         if ((*pskb)->nfct)
439                 return NF_ACCEPT;
440 #endif
441
442         /* Gather fragments. */
443         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
444                 *pskb = ip_ct_gather_frags(*pskb,
445                                            hooknum == NF_IP_PRE_ROUTING ? 
446                                            IP_DEFRAG_CONNTRACK_IN :
447                                            IP_DEFRAG_CONNTRACK_OUT);
448                 if (!*pskb)
449                         return NF_STOLEN;
450         }
451         return NF_ACCEPT;
452 }
453
454 static unsigned int ip_conntrack_local(unsigned int hooknum,
455                                        struct sk_buff **pskb,
456                                        const struct net_device *in,
457                                        const struct net_device *out,
458                                        int (*okfn)(struct sk_buff *))
459 {
460         /* root is playing with raw sockets. */
461         if ((*pskb)->len < sizeof(struct iphdr)
462             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
463                 if (net_ratelimit())
464                         printk("ipt_hook: happy cracking.\n");
465                 return NF_ACCEPT;
466         }
467         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
468 }
469
470 /* Connection tracking may drop packets, but never alters them, so
471    make it the first hook. */
472 static struct nf_hook_ops ip_conntrack_defrag_ops = {
473         .hook           = ip_conntrack_defrag,
474         .owner          = THIS_MODULE,
475         .pf             = PF_INET,
476         .hooknum        = NF_IP_PRE_ROUTING,
477         .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
478 };
479
480 static struct nf_hook_ops ip_conntrack_in_ops = {
481         .hook           = ip_conntrack_in,
482         .owner          = THIS_MODULE,
483         .pf             = PF_INET,
484         .hooknum        = NF_IP_PRE_ROUTING,
485         .priority       = NF_IP_PRI_CONNTRACK,
486 };
487
488 static struct nf_hook_ops ip_conntrack_defrag_local_out_ops = {
489         .hook           = ip_conntrack_defrag,
490         .owner          = THIS_MODULE,
491         .pf             = PF_INET,
492         .hooknum        = NF_IP_LOCAL_OUT,
493         .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
494 };
495
496 static struct nf_hook_ops ip_conntrack_local_out_ops = {
497         .hook           = ip_conntrack_local,
498         .owner          = THIS_MODULE,
499         .pf             = PF_INET,
500         .hooknum        = NF_IP_LOCAL_OUT,
501         .priority       = NF_IP_PRI_CONNTRACK,
502 };
503
504 /* helpers */
505 static struct nf_hook_ops ip_conntrack_helper_out_ops = {
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 static struct nf_hook_ops ip_conntrack_helper_in_ops = {
514         .hook           = ip_conntrack_help,
515         .owner          = THIS_MODULE,
516         .pf             = PF_INET,
517         .hooknum        = NF_IP_LOCAL_IN,
518         .priority       = NF_IP_PRI_CONNTRACK_HELPER,
519 };
520
521 /* Refragmenter; last chance. */
522 static struct nf_hook_ops ip_conntrack_out_ops = {
523         .hook           = ip_confirm,
524         .owner          = THIS_MODULE,
525         .pf             = PF_INET,
526         .hooknum        = NF_IP_POST_ROUTING,
527         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
528 };
529
530 static struct nf_hook_ops ip_conntrack_local_in_ops = {
531         .hook           = ip_confirm,
532         .owner          = THIS_MODULE,
533         .pf             = PF_INET,
534         .hooknum        = NF_IP_LOCAL_IN,
535         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
536 };
537
538 /* Sysctl support */
539
540 #ifdef CONFIG_SYSCTL
541
542 /* From ip_conntrack_core.c */
543 extern int ip_conntrack_max;
544 extern unsigned int ip_conntrack_htable_size;
545
546 /* From ip_conntrack_proto_tcp.c */
547 extern unsigned int ip_ct_tcp_timeout_syn_sent;
548 extern unsigned int ip_ct_tcp_timeout_syn_recv;
549 extern unsigned int ip_ct_tcp_timeout_established;
550 extern unsigned int ip_ct_tcp_timeout_fin_wait;
551 extern unsigned int ip_ct_tcp_timeout_close_wait;
552 extern unsigned int ip_ct_tcp_timeout_last_ack;
553 extern unsigned int ip_ct_tcp_timeout_time_wait;
554 extern unsigned int ip_ct_tcp_timeout_close;
555 extern unsigned int ip_ct_tcp_timeout_max_retrans;
556 extern int ip_ct_tcp_loose;
557 extern int ip_ct_tcp_be_liberal;
558 extern int ip_ct_tcp_max_retrans;
559
560 /* From ip_conntrack_proto_udp.c */
561 extern unsigned int ip_ct_udp_timeout;
562 extern unsigned int ip_ct_udp_timeout_stream;
563
564 /* From ip_conntrack_proto_icmp.c */
565 extern unsigned int ip_ct_icmp_timeout;
566
567 /* From ip_conntrack_proto_icmp.c */
568 extern unsigned int ip_ct_generic_timeout;
569
570 /* Log invalid packets of a given protocol */
571 static int log_invalid_proto_min = 0;
572 static int log_invalid_proto_max = 255;
573
574 static struct ctl_table_header *ip_ct_sysctl_header;
575
576 static ctl_table ip_ct_sysctl_table[] = {
577         {
578                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
579                 .procname       = "ip_conntrack_max",
580                 .data           = &ip_conntrack_max,
581                 .maxlen         = sizeof(int),
582                 .mode           = 0644,
583                 .proc_handler   = &proc_dointvec,
584         },
585         {
586                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
587                 .procname       = "ip_conntrack_count",
588                 .data           = &ip_conntrack_count,
589                 .maxlen         = sizeof(int),
590                 .mode           = 0444,
591                 .proc_handler   = &proc_dointvec,
592         },
593         {
594                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
595                 .procname       = "ip_conntrack_buckets",
596                 .data           = &ip_conntrack_htable_size,
597                 .maxlen         = sizeof(unsigned int),
598                 .mode           = 0444,
599                 .proc_handler   = &proc_dointvec,
600         },
601         {
602                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
603                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
604                 .data           = &ip_ct_tcp_timeout_syn_sent,
605                 .maxlen         = sizeof(unsigned int),
606                 .mode           = 0644,
607                 .proc_handler   = &proc_dointvec_jiffies,
608         },
609         {
610                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
611                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
612                 .data           = &ip_ct_tcp_timeout_syn_recv,
613                 .maxlen         = sizeof(unsigned int),
614                 .mode           = 0644,
615                 .proc_handler   = &proc_dointvec_jiffies,
616         },
617         {
618                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
619                 .procname       = "ip_conntrack_tcp_timeout_established",
620                 .data           = &ip_ct_tcp_timeout_established,
621                 .maxlen         = sizeof(unsigned int),
622                 .mode           = 0644,
623                 .proc_handler   = &proc_dointvec_jiffies,
624         },
625         {
626                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
627                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
628                 .data           = &ip_ct_tcp_timeout_fin_wait,
629                 .maxlen         = sizeof(unsigned int),
630                 .mode           = 0644,
631                 .proc_handler   = &proc_dointvec_jiffies,
632         },
633         {
634                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
635                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
636                 .data           = &ip_ct_tcp_timeout_close_wait,
637                 .maxlen         = sizeof(unsigned int),
638                 .mode           = 0644,
639                 .proc_handler   = &proc_dointvec_jiffies,
640         },
641         {
642                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
643                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
644                 .data           = &ip_ct_tcp_timeout_last_ack,
645                 .maxlen         = sizeof(unsigned int),
646                 .mode           = 0644,
647                 .proc_handler   = &proc_dointvec_jiffies,
648         },
649         {
650                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
651                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
652                 .data           = &ip_ct_tcp_timeout_time_wait,
653                 .maxlen         = sizeof(unsigned int),
654                 .mode           = 0644,
655                 .proc_handler   = &proc_dointvec_jiffies,
656         },
657         {
658                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
659                 .procname       = "ip_conntrack_tcp_timeout_close",
660                 .data           = &ip_ct_tcp_timeout_close,
661                 .maxlen         = sizeof(unsigned int),
662                 .mode           = 0644,
663                 .proc_handler   = &proc_dointvec_jiffies,
664         },
665         {
666                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
667                 .procname       = "ip_conntrack_udp_timeout",
668                 .data           = &ip_ct_udp_timeout,
669                 .maxlen         = sizeof(unsigned int),
670                 .mode           = 0644,
671                 .proc_handler   = &proc_dointvec_jiffies,
672         },
673         {
674                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
675                 .procname       = "ip_conntrack_udp_timeout_stream",
676                 .data           = &ip_ct_udp_timeout_stream,
677                 .maxlen         = sizeof(unsigned int),
678                 .mode           = 0644,
679                 .proc_handler   = &proc_dointvec_jiffies,
680         },
681         {
682                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
683                 .procname       = "ip_conntrack_icmp_timeout",
684                 .data           = &ip_ct_icmp_timeout,
685                 .maxlen         = sizeof(unsigned int),
686                 .mode           = 0644,
687                 .proc_handler   = &proc_dointvec_jiffies,
688         },
689         {
690                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
691                 .procname       = "ip_conntrack_generic_timeout",
692                 .data           = &ip_ct_generic_timeout,
693                 .maxlen         = sizeof(unsigned int),
694                 .mode           = 0644,
695                 .proc_handler   = &proc_dointvec_jiffies,
696         },
697         {
698                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
699                 .procname       = "ip_conntrack_log_invalid",
700                 .data           = &ip_ct_log_invalid,
701                 .maxlen         = sizeof(unsigned int),
702                 .mode           = 0644,
703                 .proc_handler   = &proc_dointvec_minmax,
704                 .strategy       = &sysctl_intvec,
705                 .extra1         = &log_invalid_proto_min,
706                 .extra2         = &log_invalid_proto_max,
707         },
708         {
709                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
710                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
711                 .data           = &ip_ct_tcp_timeout_max_retrans,
712                 .maxlen         = sizeof(unsigned int),
713                 .mode           = 0644,
714                 .proc_handler   = &proc_dointvec_jiffies,
715         },
716         {
717                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
718                 .procname       = "ip_conntrack_tcp_loose",
719                 .data           = &ip_ct_tcp_loose,
720                 .maxlen         = sizeof(unsigned int),
721                 .mode           = 0644,
722                 .proc_handler   = &proc_dointvec,
723         },
724         {
725                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
726                 .procname       = "ip_conntrack_tcp_be_liberal",
727                 .data           = &ip_ct_tcp_be_liberal,
728                 .maxlen         = sizeof(unsigned int),
729                 .mode           = 0644,
730                 .proc_handler   = &proc_dointvec,
731         },
732         {
733                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
734                 .procname       = "ip_conntrack_tcp_max_retrans",
735                 .data           = &ip_ct_tcp_max_retrans,
736                 .maxlen         = sizeof(unsigned int),
737                 .mode           = 0644,
738                 .proc_handler   = &proc_dointvec,
739         },
740         { .ctl_name = 0 }
741 };
742
743 #define NET_IP_CONNTRACK_MAX 2089
744
745 static ctl_table ip_ct_netfilter_table[] = {
746         {
747                 .ctl_name       = NET_IPV4_NETFILTER,
748                 .procname       = "netfilter",
749                 .mode           = 0555,
750                 .child          = ip_ct_sysctl_table,
751         },
752         {
753                 .ctl_name       = NET_IP_CONNTRACK_MAX,
754                 .procname       = "ip_conntrack_max",
755                 .data           = &ip_conntrack_max,
756                 .maxlen         = sizeof(int),
757                 .mode           = 0644,
758                 .proc_handler   = &proc_dointvec
759         },
760         { .ctl_name = 0 }
761 };
762
763 static ctl_table ip_ct_ipv4_table[] = {
764         {
765                 .ctl_name       = NET_IPV4,
766                 .procname       = "ipv4",
767                 .mode           = 0555,
768                 .child          = ip_ct_netfilter_table,
769         },
770         { .ctl_name = 0 }
771 };
772
773 static ctl_table ip_ct_net_table[] = {
774         {
775                 .ctl_name       = CTL_NET,
776                 .procname       = "net",
777                 .mode           = 0555, 
778                 .child          = ip_ct_ipv4_table,
779         },
780         { .ctl_name = 0 }
781 };
782
783 EXPORT_SYMBOL(ip_ct_log_invalid);
784 #endif /* CONFIG_SYSCTL */
785
786 static int init_or_cleanup(int init)
787 {
788 #ifdef CONFIG_PROC_FS
789         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
790 #endif
791         int ret = 0;
792
793         if (!init) goto cleanup;
794
795         ret = ip_conntrack_init();
796         if (ret < 0)
797                 goto cleanup_nothing;
798
799 #ifdef CONFIG_PROC_FS
800         ret = -ENOMEM;
801         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
802         if (!proc) goto cleanup_init;
803
804         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
805                                         &exp_file_ops);
806         if (!proc_exp) goto cleanup_proc;
807
808         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
809         if (!proc_stat)
810                 goto cleanup_proc_exp;
811
812         proc_stat->proc_fops = &ct_cpu_seq_fops;
813         proc_stat->owner = THIS_MODULE;
814 #endif
815
816         ret = nf_register_hook(&ip_conntrack_defrag_ops);
817         if (ret < 0) {
818                 printk("ip_conntrack: can't register pre-routing defrag hook.\n");
819                 goto cleanup_proc_stat;
820         }
821         ret = nf_register_hook(&ip_conntrack_defrag_local_out_ops);
822         if (ret < 0) {
823                 printk("ip_conntrack: can't register local_out defrag hook.\n");
824                 goto cleanup_defragops;
825         }
826         ret = nf_register_hook(&ip_conntrack_in_ops);
827         if (ret < 0) {
828                 printk("ip_conntrack: can't register pre-routing hook.\n");
829                 goto cleanup_defraglocalops;
830         }
831         ret = nf_register_hook(&ip_conntrack_local_out_ops);
832         if (ret < 0) {
833                 printk("ip_conntrack: can't register local out hook.\n");
834                 goto cleanup_inops;
835         }
836         ret = nf_register_hook(&ip_conntrack_helper_in_ops);
837         if (ret < 0) {
838                 printk("ip_conntrack: can't register local in helper hook.\n");
839                 goto cleanup_inandlocalops;
840         }
841         ret = nf_register_hook(&ip_conntrack_helper_out_ops);
842         if (ret < 0) {
843                 printk("ip_conntrack: can't register postrouting helper hook.\n");
844                 goto cleanup_helperinops;
845         }
846         ret = nf_register_hook(&ip_conntrack_out_ops);
847         if (ret < 0) {
848                 printk("ip_conntrack: can't register post-routing hook.\n");
849                 goto cleanup_helperoutops;
850         }
851         ret = nf_register_hook(&ip_conntrack_local_in_ops);
852         if (ret < 0) {
853                 printk("ip_conntrack: can't register local in hook.\n");
854                 goto cleanup_inoutandlocalops;
855         }
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;
861                 goto cleanup_localinops;
862         }
863 #endif
864
865         return ret;
866
867  cleanup:
868         synchronize_net();
869 #ifdef CONFIG_SYSCTL
870         unregister_sysctl_table(ip_ct_sysctl_header);
871  cleanup_localinops:
872 #endif
873         nf_unregister_hook(&ip_conntrack_local_in_ops);
874  cleanup_inoutandlocalops:
875         nf_unregister_hook(&ip_conntrack_out_ops);
876  cleanup_helperoutops:
877         nf_unregister_hook(&ip_conntrack_helper_out_ops);
878  cleanup_helperinops:
879         nf_unregister_hook(&ip_conntrack_helper_in_ops);
880  cleanup_inandlocalops:
881         nf_unregister_hook(&ip_conntrack_local_out_ops);
882  cleanup_inops:
883         nf_unregister_hook(&ip_conntrack_in_ops);
884  cleanup_defraglocalops:
885         nf_unregister_hook(&ip_conntrack_defrag_local_out_ops);
886  cleanup_defragops:
887         nf_unregister_hook(&ip_conntrack_defrag_ops);
888  cleanup_proc_stat:
889 #ifdef CONFIG_PROC_FS
890         remove_proc_entry("ip_conntrack", proc_net_stat);
891  cleanup_proc_exp:
892         proc_net_remove("ip_conntrack_expect");
893  cleanup_proc:
894         proc_net_remove("ip_conntrack");
895  cleanup_init:
896 #endif /* CONFIG_PROC_FS */
897         ip_conntrack_cleanup();
898  cleanup_nothing:
899         return ret;
900 }
901
902 /* FIXME: Allow NULL functions and sub in pointers to generic for
903    them. --RR */
904 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
905 {
906         int ret = 0;
907
908         write_lock_bh(&ip_conntrack_lock);
909         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
910                 ret = -EBUSY;
911                 goto out;
912         }
913         ip_ct_protos[proto->proto] = proto;
914  out:
915         write_unlock_bh(&ip_conntrack_lock);
916         return ret;
917 }
918
919 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
920 {
921         write_lock_bh(&ip_conntrack_lock);
922         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
923         write_unlock_bh(&ip_conntrack_lock);
924         
925         /* Somebody could be still looking at the proto in bh. */
926         synchronize_net();
927
928         /* Remove all contrack entries for this protocol */
929         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
930 }
931
932 static int __init init(void)
933 {
934         return init_or_cleanup(1);
935 }
936
937 static void __exit fini(void)
938 {
939         init_or_cleanup(0);
940 }
941
942 module_init(init);
943 module_exit(fini);
944
945 /* Some modules need us, but don't depend directly on any symbol.
946    They should call this. */
947 void need_ip_conntrack(void)
948 {
949 }
950
951 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
952 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
953 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
954 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
955 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
956 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
957 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
958 #endif
959 EXPORT_SYMBOL(ip_conntrack_protocol_register);
960 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
961 EXPORT_SYMBOL(ip_ct_get_tuple);
962 EXPORT_SYMBOL(invert_tuplepr);
963 EXPORT_SYMBOL(ip_conntrack_alter_reply);
964 EXPORT_SYMBOL(ip_conntrack_destroyed);
965 EXPORT_SYMBOL(need_ip_conntrack);
966 EXPORT_SYMBOL(ip_conntrack_helper_register);
967 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
968 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
969 EXPORT_SYMBOL(__ip_ct_refresh_acct);
970
971 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
972 EXPORT_SYMBOL(ip_conntrack_expect_put);
973 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
974 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find);
975 EXPORT_SYMBOL(ip_conntrack_expect_related);
976 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
977 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
978 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
979
980 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
981 EXPORT_SYMBOL(ip_ct_gather_frags);
982 EXPORT_SYMBOL(ip_conntrack_htable_size);
983 EXPORT_SYMBOL(ip_conntrack_lock);
984 EXPORT_SYMBOL(ip_conntrack_hash);
985 EXPORT_SYMBOL(ip_conntrack_untracked);
986 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
987 #ifdef CONFIG_IP_NF_NAT_NEEDED
988 EXPORT_SYMBOL(ip_conntrack_tcp_update);
989 #endif
990
991 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
992 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
993
994 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
995 EXPORT_SYMBOL_GPL(ip_conntrack_free);
996 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
997
998 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
999
1000 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
1001 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
1002 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
1003
1004 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
1005 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
1006 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
1007 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
1008     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
1009 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
1010 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
1011 #endif