err.no Git - linux-2.6/blob - 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
  31 #define ASSERT_READ_LOCK(x)
  32 #define ASSERT_WRITE_LOCK(x)
  33
  34 #include <linux/netfilter_ipv4/ip_conntrack.h>
  35 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  36 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
  37 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
  38 #include <linux/netfilter_ipv4/listhelp.h>
  39
  40 #if 0
  41 #define DEBUGP printk
  42 #else
  43 #define DEBUGP(format, args...)
  44 #endif
  45
  46 MODULE_LICENSE("GPL");
  47
  48 extern atomic_t ip_conntrack_count;
  49 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  50
  51 static int kill_proto(struct ip_conntrack *i, void *data)
  52 {
  53         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  54                         *((u_int8_t *) data));
  55 }
  56
  57 #ifdef CONFIG_PROC_FS
  58 static int
  59 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  60             struct ip_conntrack_protocol *proto)
  61 {
  62         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  63                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  64         return proto->print_tuple(s, tuple);
  65 }
  66
  67 #ifdef CONFIG_IP_NF_CT_ACCT
  68 static unsigned int
  69 seq_print_counters(struct seq_file *s,
  70                    const struct ip_conntrack_counter *counter)
  71 {
  72         return seq_printf(s, "packets=%llu bytes=%llu ",
  73                           (unsigned long long)counter->packets,
  74                           (unsigned long long)counter->bytes);
  75 }
  76 #else
  77 #define seq_print_counters(x, y)        0
  78 #endif
  79
  80 struct ct_iter_state {
  81         unsigned int bucket;
  82 };
  83
  84 static struct list_head *ct_get_first(struct seq_file *seq)
  85 {
  86         struct ct_iter_state *st = seq->private;
  87
  88         for (st->bucket = 0;
  89              st->bucket < ip_conntrack_htable_size;
  90              st->bucket++) {
  91                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  92                         return ip_conntrack_hash[st->bucket].next;
  93         }
  94         return NULL;
  95 }
  96
  97 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  98 {
  99         struct ct_iter_state *st = seq->private;
 100
 101         head = head->next;
 102         while (head == &ip_conntrack_hash[st->bucket]) {
 103                 if (++st->bucket >= ip_conntrack_htable_size)
 104                         return NULL;
 105                 head = ip_conntrack_hash[st->bucket].next;
 106         }
 107         return head;
 108 }
 109
 110 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 111 {
 112         struct list_head *head = ct_get_first(seq);
 113
 114         if (head)
 115                 while (pos && (head = ct_get_next(seq, head)))
 116                         pos--;
 117         return pos ? NULL : head;
 118 }
 119
 120 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 121 {
 122         read_lock_bh(&ip_conntrack_lock);
 123         return ct_get_idx(seq, *pos);
 124 }
 125
 126 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 127 {
 128         (*pos)++;
 129         return ct_get_next(s, v);
 130 }
 131
 132 static void ct_seq_stop(struct seq_file *s, void *v)
 133 {
 134         read_unlock_bh(&ip_conntrack_lock);
 135 }
 136
 137 static int ct_seq_show(struct seq_file *s, void *v)
 138 {
 139         const struct ip_conntrack_tuple_hash *hash = v;
 140         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 141         struct ip_conntrack_protocol *proto;
 142
 143         ASSERT_READ_LOCK(&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_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 151         IP_NF_ASSERT(proto);
 152
 153         if (seq_printf(s, "%-8s %u %ld ",
 154                       proto->name,
 155                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 156                       timer_pending(&conntrack->timeout)
 157                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 158                       : 0) != 0)
 159                 return -ENOSPC;
 160
 161         if (proto->print_conntrack(s, conntrack))
 162                 return -ENOSPC;
 163
 164         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 165                         proto))
 166                 return -ENOSPC;
 167
 168         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 169                 return -ENOSPC;
 170
 171         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 172                 if (seq_printf(s, "[UNREPLIED] "))
 173                         return -ENOSPC;
 174
 175         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 176                         proto))
 177                 return -ENOSPC;
 178
 179         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 180                 return -ENOSPC;
 181
 182         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 183                 if (seq_printf(s, "[ASSURED] "))
 184                         return -ENOSPC;
 185
 186 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 187         if (seq_printf(s, "mark=%u ", conntrack->mark))
 188                 return -ENOSPC;
 189 #endif
 190
 191         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 192                 return -ENOSPC;
 193
 194         return 0;
 195 }
 196
 197 static struct seq_operations ct_seq_ops = {
 198         .start = ct_seq_start,
 199         .next  = ct_seq_next,
 200         .stop  = ct_seq_stop,
 201         .show  = ct_seq_show
 202 };
 203
 204 static int ct_open(struct inode *inode, struct file *file)
 205 {
 206         struct seq_file *seq;
 207         struct ct_iter_state *st;
 208         int ret;
 209
 210         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 211         if (st == NULL)
 212                 return -ENOMEM;
 213         ret = seq_open(file, &ct_seq_ops);
 214         if (ret)
 215                 goto out_free;
 216         seq          = file->private_data;
 217         seq->private = st;
 218         memset(st, 0, sizeof(struct ct_iter_state));
 219         return ret;
 220 out_free:
 221         kfree(st);
 222         return ret;
 223 }
 224
 225 static struct file_operations ct_file_ops = {
 226         .owner   = THIS_MODULE,
 227         .open    = ct_open,
 228         .read    = seq_read,
 229         .llseek  = seq_lseek,
 230         .release = seq_release_private,
 231 };
 232
 233 /* expects */
 234 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 235 {
 236         struct list_head *e = &ip_conntrack_expect_list;
 237         loff_t i;
 238
 239         /* strange seq_file api calls stop even if we fail,
 240          * thus we need to grab lock since stop unlocks */
 241         read_lock_bh(&ip_conntrack_lock);
 242
 243         if (list_empty(e))
 244                 return NULL;
 245
 246         for (i = 0; i <= *pos; i++) {
 247                 e = e->next;
 248                 if (e == &ip_conntrack_expect_list)
 249                         return NULL;
 250         }
 251         return e;
 252 }
 253
 254 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 255 {
 256         struct list_head *e = v;
 257
 258         ++*pos;
 259         e = e->next;
 260
 261         if (e == &ip_conntrack_expect_list)
 262                 return NULL;
 263
 264         return e;
 265 }
 266
 267 static void exp_seq_stop(struct seq_file *s, void *v)
 268 {
 269         read_unlock_bh(&ip_conntrack_lock);
 270 }
 271
 272 static int exp_seq_show(struct seq_file *s, void *v)
 273 {
 274         struct ip_conntrack_expect *expect = v;
 275
 276         if (expect->timeout.function)
 277                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 278                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 279         else
 280                 seq_printf(s, "- ");
 281
 282         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
 283
 284         print_tuple(s, &expect->tuple,
 285                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
 286         return seq_putc(s, '\n');
 287 }
 288
 289 static struct seq_operations exp_seq_ops = {
 290         .start = exp_seq_start,
 291         .next = exp_seq_next,
 292         .stop = exp_seq_stop,
 293         .show = exp_seq_show
 294 };
 295
 296 static int exp_open(struct inode *inode, struct file *file)
 297 {
 298         return seq_open(file, &exp_seq_ops);
 299 }
 300
 301 static struct file_operations exp_file_ops = {
 302         .owner   = THIS_MODULE,
 303         .open    = exp_open,
 304         .read    = seq_read,
 305         .llseek  = seq_lseek,
 306         .release = seq_release
 307 };
 308
 309 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 310 {
 311         int cpu;
 312
 313         if (*pos == 0)
 314                 return SEQ_START_TOKEN;
 315
 316         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 317                 if (!cpu_possible(cpu))
 318                         continue;
 319                 *pos = cpu+1;
 320                 return &per_cpu(ip_conntrack_stat, cpu);
 321         }
 322
 323         return NULL;
 324 }
 325
 326 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 327 {
 328         int cpu;
 329
 330         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 331                 if (!cpu_possible(cpu))
 332                         continue;
 333                 *pos = cpu+1;
 334                 return &per_cpu(ip_conntrack_stat, cpu);
 335         }
 336
 337         return NULL;
 338 }
 339
 340 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 341 {
 342 }
 343
 344 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 345 {
 346         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
 347         struct ip_conntrack_stat *st = v;
 348
 349         if (v == SEQ_START_TOKEN) {
 350                 seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete\n");
 351                 return 0;
 352         }
 353
 354         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 355                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 356                    nr_conntracks,
 357                    st->searched,
 358                    st->found,
 359                    st->new,
 360                    st->invalid,
 361                    st->ignore,
 362                    st->delete,
 363                    st->delete_list,
 364                    st->insert,
 365                    st->insert_failed,
 366                    st->drop,
 367                    st->early_drop,
 368                    st->error,
 369
 370                    st->expect_new,
 371                    st->expect_create,
 372                    st->expect_delete
 373                 );
 374         return 0;
 375 }
 376
 377 static struct seq_operations ct_cpu_seq_ops = {
 378         .start  = ct_cpu_seq_start,
 379         .next   = ct_cpu_seq_next,
 380         .stop   = ct_cpu_seq_stop,
 381         .show   = ct_cpu_seq_show,
 382 };
 383
 384 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 385 {
 386         return seq_open(file, &ct_cpu_seq_ops);
 387 }
 388
 389 static struct file_operations ct_cpu_seq_fops = {
 390         .owner   = THIS_MODULE,
 391         .open    = ct_cpu_seq_open,
 392         .read    = seq_read,
 393         .llseek  = seq_lseek,
 394         .release = seq_release_private,
 395 };
 396 #endif
 397
 398 static unsigned int ip_confirm(unsigned int hooknum,
 399                                struct sk_buff **pskb,
 400                                const struct net_device *in,
 401                                const struct net_device *out,
 402                                int (*okfn)(struct sk_buff *))
 403 {
 404         ip_conntrack_event_cache_init(*pskb);
 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                 ip_conntrack_event_cache_init(*pskb);
 423                 ret = ct->helper->help(pskb, ct, ctinfo);
 424                 if (ret != NF_ACCEPT)
 425                         return ret;
 426         }
 427         return NF_ACCEPT;
 428 }
 429
 430 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 431                                         struct sk_buff **pskb,
 432                                         const struct net_device *in,
 433                                         const struct net_device *out,
 434                                         int (*okfn)(struct sk_buff *))
 435 {
 436 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
 437         /* Previously seen (loopback)?  Ignore.  Do this before
 438            fragment check. */
 439         if ((*pskb)->nfct)
 440                 return NF_ACCEPT;
 441 #endif
 442
 443         /* Gather fragments. */
 444         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
 445                 *pskb = ip_ct_gather_frags(*pskb,
 446                                            hooknum == NF_IP_PRE_ROUTING ?
 447                                            IP_DEFRAG_CONNTRACK_IN :
 448                                            IP_DEFRAG_CONNTRACK_OUT);
 449                 if (!*pskb)
 450                         return NF_STOLEN;
 451         }
 452         return NF_ACCEPT;
 453 }
 454
 455 static unsigned int ip_refrag(unsigned int hooknum,
 456                               struct sk_buff **pskb,
 457                               const struct net_device *in,
 458                               const struct net_device *out,
 459                               int (*okfn)(struct sk_buff *))
 460 {
 461         struct rtable *rt = (struct rtable *)(*pskb)->dst;
 462
 463         /* We've seen it coming out the other side: confirm */
 464         if (ip_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT)
 465                 return NF_DROP;
 466
 467         /* Local packets are never produced too large for their
 468            interface.  We degfragment them at LOCAL_OUT, however,
 469            so we have to refragment them here. */
 470         if ((*pskb)->len > dst_mtu(&rt->u.dst) &&
 471             !skb_shinfo(*pskb)->tso_size) {
 472                 /* No hook can be after us, so this should be OK. */
 473                 ip_fragment(*pskb, okfn);
 474                 return NF_STOLEN;
 475         }
 476         return NF_ACCEPT;
 477 }
 478
 479 static unsigned int ip_conntrack_local(unsigned int hooknum,
 480                                        struct sk_buff **pskb,
 481                                        const struct net_device *in,
 482                                        const struct net_device *out,
 483                                        int (*okfn)(struct sk_buff *))
 484 {
 485         /* root is playing with raw sockets. */
 486         if ((*pskb)->len < sizeof(struct iphdr)
 487             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 488                 if (net_ratelimit())
 489                         printk("ipt_hook: happy cracking.\n");
 490                 return NF_ACCEPT;
 491         }
 492         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 493 }
 494
 495 /* Connection tracking may drop packets, but never alters them, so
 496    make it the first hook. */
 497 static struct nf_hook_ops ip_conntrack_defrag_ops = {
 498         .hook           = ip_conntrack_defrag,
 499         .owner          = THIS_MODULE,
 500         .pf             = PF_INET,
 501         .hooknum        = NF_IP_PRE_ROUTING,
 502         .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 503 };
 504
 505 static struct nf_hook_ops ip_conntrack_in_ops = {
 506         .hook           = ip_conntrack_in,
 507         .owner          = THIS_MODULE,
 508         .pf             = PF_INET,
 509         .hooknum        = NF_IP_PRE_ROUTING,
 510         .priority       = NF_IP_PRI_CONNTRACK,
 511 };
 512
 513 static struct nf_hook_ops ip_conntrack_defrag_local_out_ops = {
 514         .hook           = ip_conntrack_defrag,
 515         .owner          = THIS_MODULE,
 516         .pf             = PF_INET,
 517         .hooknum        = NF_IP_LOCAL_OUT,
 518         .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 519 };
 520
 521 static struct nf_hook_ops ip_conntrack_local_out_ops = {
 522         .hook           = ip_conntrack_local,
 523         .owner          = THIS_MODULE,
 524         .pf             = PF_INET,
 525         .hooknum        = NF_IP_LOCAL_OUT,
 526         .priority       = NF_IP_PRI_CONNTRACK,
 527 };
 528
 529 /* helpers */
 530 static struct nf_hook_ops ip_conntrack_helper_out_ops = {
 531         .hook           = ip_conntrack_help,
 532         .owner          = THIS_MODULE,
 533         .pf             = PF_INET,
 534         .hooknum        = NF_IP_POST_ROUTING,
 535         .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 536 };
 537
 538 static struct nf_hook_ops ip_conntrack_helper_in_ops = {
 539         .hook           = ip_conntrack_help,
 540         .owner          = THIS_MODULE,
 541         .pf             = PF_INET,
 542         .hooknum        = NF_IP_LOCAL_IN,
 543         .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 544 };
 545
 546 /* Refragmenter; last chance. */
 547 static struct nf_hook_ops ip_conntrack_out_ops = {
 548         .hook           = ip_refrag,
 549         .owner          = THIS_MODULE,
 550         .pf             = PF_INET,
 551         .hooknum        = NF_IP_POST_ROUTING,
 552         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 553 };
 554
 555 static struct nf_hook_ops ip_conntrack_local_in_ops = {
 556         .hook           = ip_confirm,
 557         .owner          = THIS_MODULE,
 558         .pf             = PF_INET,
 559         .hooknum        = NF_IP_LOCAL_IN,
 560         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 561 };
 562
 563 /* Sysctl support */
 564
 565 #ifdef CONFIG_SYSCTL
 566
 567 /* From ip_conntrack_core.c */
 568 extern int ip_conntrack_max;
 569 extern unsigned int ip_conntrack_htable_size;
 570
 571 /* From ip_conntrack_proto_tcp.c */
 572 extern unsigned long ip_ct_tcp_timeout_syn_sent;
 573 extern unsigned long ip_ct_tcp_timeout_syn_recv;
 574 extern unsigned long ip_ct_tcp_timeout_established;
 575 extern unsigned long ip_ct_tcp_timeout_fin_wait;
 576 extern unsigned long ip_ct_tcp_timeout_close_wait;
 577 extern unsigned long ip_ct_tcp_timeout_last_ack;
 578 extern unsigned long ip_ct_tcp_timeout_time_wait;
 579 extern unsigned long ip_ct_tcp_timeout_close;
 580 extern unsigned long ip_ct_tcp_timeout_max_retrans;
 581 extern int ip_ct_tcp_loose;
 582 extern int ip_ct_tcp_be_liberal;
 583 extern int ip_ct_tcp_max_retrans;
 584
 585 /* From ip_conntrack_proto_udp.c */
 586 extern unsigned long ip_ct_udp_timeout;
 587 extern unsigned long ip_ct_udp_timeout_stream;
 588
 589 /* From ip_conntrack_proto_icmp.c */
 590 extern unsigned long ip_ct_icmp_timeout;
 591
 592 /* From ip_conntrack_proto_icmp.c */
 593 extern unsigned long ip_ct_generic_timeout;
 594
 595 /* Log invalid packets of a given protocol */
 596 static int log_invalid_proto_min = 0;
 597 static int log_invalid_proto_max = 255;
 598
 599 static struct ctl_table_header *ip_ct_sysctl_header;
 600
 601 static ctl_table ip_ct_sysctl_table[] = {
 602         {
 603                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 604                 .procname       = "ip_conntrack_max",
 605                 .data           = &ip_conntrack_max,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = &proc_dointvec,
 609         },
 610         {
 611                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 612                 .procname       = "ip_conntrack_count",
 613                 .data           = &ip_conntrack_count,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0444,
 616                 .proc_handler   = &proc_dointvec,
 617         },
 618         {
 619                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 620                 .procname       = "ip_conntrack_buckets",
 621                 .data           = &ip_conntrack_htable_size,
 622                 .maxlen         = sizeof(unsigned int),
 623                 .mode           = 0444,
 624                 .proc_handler   = &proc_dointvec,
 625         },
 626         {
 627                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 628                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 629                 .data           = &ip_ct_tcp_timeout_syn_sent,
 630                 .maxlen         = sizeof(unsigned int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec_jiffies,
 633         },
 634         {
 635                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 636                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 637                 .data           = &ip_ct_tcp_timeout_syn_recv,
 638                 .maxlen         = sizeof(unsigned int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec_jiffies,
 641         },
 642         {
 643                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 644                 .procname       = "ip_conntrack_tcp_timeout_established",
 645                 .data           = &ip_ct_tcp_timeout_established,
 646                 .maxlen         = sizeof(unsigned int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec_jiffies,
 649         },
 650         {
 651                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 652                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 653                 .data           = &ip_ct_tcp_timeout_fin_wait,
 654                 .maxlen         = sizeof(unsigned int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_dointvec_jiffies,
 657         },
 658         {
 659                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 660                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 661                 .data           = &ip_ct_tcp_timeout_close_wait,
 662                 .maxlen         = sizeof(unsigned int),
 663                 .mode           = 0644,
 664                 .proc_handler   = &proc_dointvec_jiffies,
 665         },
 666         {
 667                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 668                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 669                 .data           = &ip_ct_tcp_timeout_last_ack,
 670                 .maxlen         = sizeof(unsigned int),
 671                 .mode           = 0644,
 672                 .proc_handler   = &proc_dointvec_jiffies,
 673         },
 674         {
 675                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 676                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 677                 .data           = &ip_ct_tcp_timeout_time_wait,
 678                 .maxlen         = sizeof(unsigned int),
 679                 .mode           = 0644,
 680                 .proc_handler   = &proc_dointvec_jiffies,
 681         },
 682         {
 683                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 684                 .procname       = "ip_conntrack_tcp_timeout_close",
 685                 .data           = &ip_ct_tcp_timeout_close,
 686                 .maxlen         = sizeof(unsigned int),
 687                 .mode           = 0644,
 688                 .proc_handler   = &proc_dointvec_jiffies,
 689         },
 690         {
 691                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 692                 .procname       = "ip_conntrack_udp_timeout",
 693                 .data           = &ip_ct_udp_timeout,
 694                 .maxlen         = sizeof(unsigned int),
 695                 .mode           = 0644,
 696                 .proc_handler   = &proc_dointvec_jiffies,
 697         },
 698         {
 699                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 700                 .procname       = "ip_conntrack_udp_timeout_stream",
 701                 .data           = &ip_ct_udp_timeout_stream,
 702                 .maxlen         = sizeof(unsigned int),
 703                 .mode           = 0644,
 704                 .proc_handler   = &proc_dointvec_jiffies,
 705         },
 706         {
 707                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 708                 .procname       = "ip_conntrack_icmp_timeout",
 709                 .data           = &ip_ct_icmp_timeout,
 710                 .maxlen         = sizeof(unsigned int),
 711                 .mode           = 0644,
 712                 .proc_handler   = &proc_dointvec_jiffies,
 713         },
 714         {
 715                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 716                 .procname       = "ip_conntrack_generic_timeout",
 717                 .data           = &ip_ct_generic_timeout,
 718                 .maxlen         = sizeof(unsigned int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec_jiffies,
 721         },
 722         {
 723                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 724                 .procname       = "ip_conntrack_log_invalid",
 725                 .data           = &ip_ct_log_invalid,
 726                 .maxlen         = sizeof(unsigned int),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_dointvec_minmax,
 729                 .strategy       = &sysctl_intvec,
 730                 .extra1         = &log_invalid_proto_min,
 731                 .extra2         = &log_invalid_proto_max,
 732         },
 733         {
 734                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 735                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 736                 .data           = &ip_ct_tcp_timeout_max_retrans,
 737                 .maxlen         = sizeof(unsigned int),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_dointvec_jiffies,
 740         },
 741         {
 742                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 743                 .procname       = "ip_conntrack_tcp_loose",
 744                 .data           = &ip_ct_tcp_loose,
 745                 .maxlen         = sizeof(unsigned int),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_dointvec,
 748         },
 749         {
 750                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 751                 .procname       = "ip_conntrack_tcp_be_liberal",
 752                 .data           = &ip_ct_tcp_be_liberal,
 753                 .maxlen         = sizeof(unsigned int),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_dointvec,
 756         },
 757         {
 758                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 759                 .procname       = "ip_conntrack_tcp_max_retrans",
 760                 .data           = &ip_ct_tcp_max_retrans,
 761                 .maxlen         = sizeof(unsigned int),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_dointvec,
 764         },
 765         { .ctl_name = 0 }
 766 };
 767
 768 #define NET_IP_CONNTRACK_MAX 2089
 769
 770 static ctl_table ip_ct_netfilter_table[] = {
 771         {
 772                 .ctl_name       = NET_IPV4_NETFILTER,
 773                 .procname       = "netfilter",
 774                 .mode           = 0555,
 775                 .child          = ip_ct_sysctl_table,
 776         },
 777         {
 778                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 779                 .procname       = "ip_conntrack_max",
 780                 .data           = &ip_conntrack_max,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = &proc_dointvec
 784         },
 785         { .ctl_name = 0 }
 786 };
 787
 788 static ctl_table ip_ct_ipv4_table[] = {
 789         {
 790                 .ctl_name       = NET_IPV4,
 791                 .procname       = "ipv4",
 792                 .mode           = 0555,
 793                 .child          = ip_ct_netfilter_table,
 794         },
 795         { .ctl_name = 0 }
 796 };
 797
 798 static ctl_table ip_ct_net_table[] = {
 799         {
 800                 .ctl_name       = CTL_NET,
 801                 .procname       = "net",
 802                 .mode           = 0555,
 803                 .child          = ip_ct_ipv4_table,
 804         },
 805         { .ctl_name = 0 }
 806 };
 807
 808 EXPORT_SYMBOL(ip_ct_log_invalid);
 809 #endif /* CONFIG_SYSCTL */
 810
 811 static int init_or_cleanup(int init)
 812 {
 813 #ifdef CONFIG_PROC_FS
 814         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 815 #endif
 816         int ret = 0;
 817
 818         if (!init) goto cleanup;
 819
 820         ret = ip_conntrack_init();
 821         if (ret < 0)
 822                 goto cleanup_nothing;
 823
 824 #ifdef CONFIG_PROC_FS
 825         ret = -ENOMEM;
 826         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 827         if (!proc) goto cleanup_init;
 828
 829         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 830                                         &exp_file_ops);
 831         if (!proc_exp) goto cleanup_proc;
 832
 833         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 834         if (!proc_stat)
 835                 goto cleanup_proc_exp;
 836
 837         proc_stat->proc_fops = &ct_cpu_seq_fops;
 838         proc_stat->owner = THIS_MODULE;
 839 #endif
 840
 841         ret = nf_register_hook(&ip_conntrack_defrag_ops);
 842         if (ret < 0) {
 843                 printk("ip_conntrack: can't register pre-routing defrag hook.\n");
 844                 goto cleanup_proc_stat;
 845         }
 846         ret = nf_register_hook(&ip_conntrack_defrag_local_out_ops);
 847         if (ret < 0) {
 848                 printk("ip_conntrack: can't register local_out defrag hook.\n");
 849                 goto cleanup_defragops;
 850         }
 851         ret = nf_register_hook(&ip_conntrack_in_ops);
 852         if (ret < 0) {
 853                 printk("ip_conntrack: can't register pre-routing hook.\n");
 854                 goto cleanup_defraglocalops;
 855         }
 856         ret = nf_register_hook(&ip_conntrack_local_out_ops);
 857         if (ret < 0) {
 858                 printk("ip_conntrack: can't register local out hook.\n");
 859                 goto cleanup_inops;
 860         }
 861         ret = nf_register_hook(&ip_conntrack_helper_in_ops);
 862         if (ret < 0) {
 863                 printk("ip_conntrack: can't register local in helper hook.\n");
 864                 goto cleanup_inandlocalops;
 865         }
 866         ret = nf_register_hook(&ip_conntrack_helper_out_ops);
 867         if (ret < 0) {
 868                 printk("ip_conntrack: can't register postrouting helper hook.\n");
 869                 goto cleanup_helperinops;
 870         }
 871         ret = nf_register_hook(&ip_conntrack_out_ops);
 872         if (ret < 0) {
 873                 printk("ip_conntrack: can't register post-routing hook.\n");
 874                 goto cleanup_helperoutops;
 875         }
 876         ret = nf_register_hook(&ip_conntrack_local_in_ops);
 877         if (ret < 0) {
 878                 printk("ip_conntrack: can't register local in hook.\n");
 879                 goto cleanup_inoutandlocalops;
 880         }
 881 #ifdef CONFIG_SYSCTL
 882         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 883         if (ip_ct_sysctl_header == NULL) {
 884                 printk("ip_conntrack: can't register to sysctl.\n");
 885                 ret = -ENOMEM;
 886                 goto cleanup_localinops;
 887         }
 888 #endif
 889
 890         return ret;
 891
 892  cleanup:
 893         synchronize_net();
 894 #ifdef CONFIG_SYSCTL
 895         unregister_sysctl_table(ip_ct_sysctl_header);
 896  cleanup_localinops:
 897 #endif
 898         nf_unregister_hook(&ip_conntrack_local_in_ops);
 899  cleanup_inoutandlocalops:
 900         nf_unregister_hook(&ip_conntrack_out_ops);
 901  cleanup_helperoutops:
 902         nf_unregister_hook(&ip_conntrack_helper_out_ops);
 903  cleanup_helperinops:
 904         nf_unregister_hook(&ip_conntrack_helper_in_ops);
 905  cleanup_inandlocalops:
 906         nf_unregister_hook(&ip_conntrack_local_out_ops);
 907  cleanup_inops:
 908         nf_unregister_hook(&ip_conntrack_in_ops);
 909  cleanup_defraglocalops:
 910         nf_unregister_hook(&ip_conntrack_defrag_local_out_ops);
 911  cleanup_defragops:
 912         nf_unregister_hook(&ip_conntrack_defrag_ops);
 913  cleanup_proc_stat:
 914 #ifdef CONFIG_PROC_FS
 915         remove_proc_entry("ip_conntrack", proc_net_stat);
 916  cleanup_proc_exp:
 917         proc_net_remove("ip_conntrack_expect");
 918  cleanup_proc:
 919         proc_net_remove("ip_conntrack");
 920  cleanup_init:
 921 #endif /* CONFIG_PROC_FS */
 922         ip_conntrack_cleanup();
 923  cleanup_nothing:
 924         return ret;
 925 }
 926
 927 /* FIXME: Allow NULL functions and sub in pointers to generic for
 928    them. --RR */
 929 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 930 {
 931         int ret = 0;
 932
 933         write_lock_bh(&ip_conntrack_lock);
 934         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 935                 ret = -EBUSY;
 936                 goto out;
 937         }
 938         ip_ct_protos[proto->proto] = proto;
 939  out:
 940         write_unlock_bh(&ip_conntrack_lock);
 941         return ret;
 942 }
 943
 944 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 945 {
 946         write_lock_bh(&ip_conntrack_lock);
 947         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 948         write_unlock_bh(&ip_conntrack_lock);
 949
 950         /* Somebody could be still looking at the proto in bh. */
 951         synchronize_net();
 952
 953         /* Remove all contrack entries for this protocol */
 954         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 955 }
 956
 957 static int __init init(void)
 958 {
 959         return init_or_cleanup(1);
 960 }
 961
 962 static void __exit fini(void)
 963 {
 964         init_or_cleanup(0);
 965 }
 966
 967 module_init(init);
 968 module_exit(fini);
 969
 970 /* Some modules need us, but don't depend directly on any symbol.
 971    They should call this. */
 972 void need_ip_conntrack(void)
 973 {
 974 }
 975
 976 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 977 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 978 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 979 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 980 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 981 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 982 #endif
 983 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 984 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 985 EXPORT_SYMBOL(ip_ct_get_tuple);
 986 EXPORT_SYMBOL(invert_tuplepr);
 987 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 988 EXPORT_SYMBOL(ip_conntrack_destroyed);
 989 EXPORT_SYMBOL(need_ip_conntrack);
 990 EXPORT_SYMBOL(ip_conntrack_helper_register);
 991 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 992 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 993 EXPORT_SYMBOL(ip_ct_refresh_acct);
 994
 995 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 996 EXPORT_SYMBOL(ip_conntrack_expect_put);
 997 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find_get);
 998 EXPORT_SYMBOL(ip_conntrack_expect_related);
 999 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
1000 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
1001 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
1002 EXPORT_SYMBOL_GPL(__ip_ct_expect_unlink_destroy);
1003
1004 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
1005 EXPORT_SYMBOL(ip_ct_gather_frags);
1006 EXPORT_SYMBOL(ip_conntrack_htable_size);
1007 EXPORT_SYMBOL(ip_conntrack_lock);
1008 EXPORT_SYMBOL(ip_conntrack_hash);
1009 EXPORT_SYMBOL(ip_conntrack_untracked);
1010 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
1011 #ifdef CONFIG_IP_NF_NAT_NEEDED
1012 EXPORT_SYMBOL(ip_conntrack_tcp_update);
1013 #endif
1014
1015 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
1016 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
1017
1018 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
1019 EXPORT_SYMBOL_GPL(ip_conntrack_free);
1020 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
1021
1022 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
1023
1024 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
1025 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
1026 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
1027
1028 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
1029 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
1030 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
1031 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
1032     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
1033 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
1034 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
1035 #endif