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         /* We've seen it coming out the other side: confirm it */
 405         return ip_conntrack_confirm(pskb);
 406 }
 407
 408 static 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 *))
 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         }
 425         return NF_ACCEPT;
 426 }
 427
 428 static 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
 453 static 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
 477 static 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. */
 495 static 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
 503 static 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
 511 static 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
 519 static 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
 527 /* helpers */
 528 static 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
 536 static 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
 544 /* Refragmenter; last chance. */
 545 static 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,
 550         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 551 };
 552
 553 static 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,
 558         .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 559 };
 560
 561 /* Sysctl support */
 562
 563 #ifdef CONFIG_SYSCTL
 564
 565 /* From ip_conntrack_core.c */
 566 extern int ip_conntrack_max;
 567 extern unsigned int ip_conntrack_htable_size;
 568
 569 /* From ip_conntrack_proto_tcp.c */
 570 extern unsigned long ip_ct_tcp_timeout_syn_sent;
 571 extern unsigned long ip_ct_tcp_timeout_syn_recv;
 572 extern unsigned long ip_ct_tcp_timeout_established;
 573 extern unsigned long ip_ct_tcp_timeout_fin_wait;
 574 extern unsigned long ip_ct_tcp_timeout_close_wait;
 575 extern unsigned long ip_ct_tcp_timeout_last_ack;
 576 extern unsigned long ip_ct_tcp_timeout_time_wait;
 577 extern unsigned long ip_ct_tcp_timeout_close;
 578 extern unsigned long ip_ct_tcp_timeout_max_retrans;
 579 extern int ip_ct_tcp_loose;
 580 extern int ip_ct_tcp_be_liberal;
 581 extern int ip_ct_tcp_max_retrans;
 582
 583 /* From ip_conntrack_proto_udp.c */
 584 extern unsigned long ip_ct_udp_timeout;
 585 extern unsigned long ip_ct_udp_timeout_stream;
 586
 587 /* From ip_conntrack_proto_icmp.c */
 588 extern unsigned long ip_ct_icmp_timeout;
 589
 590 /* From ip_conntrack_proto_icmp.c */
 591 extern unsigned long ip_ct_generic_timeout;
 592
 593 /* Log invalid packets of a given protocol */
 594 static int log_invalid_proto_min = 0;
 595 static int log_invalid_proto_max = 255;
 596
 597 static struct ctl_table_header *ip_ct_sysctl_header;
 598
 599 static 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
 768 static 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
 786 static 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
 796 static 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
 806 EXPORT_SYMBOL(ip_ct_log_invalid);
 807 #endif /* CONFIG_SYSCTL */
 808
 809 static 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         }
 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         }
 869         ret = nf_register_hook(&ip_conntrack_out_ops);
 870         if (ret < 0) {
 871                 printk("ip_conntrack: can't register post-routing hook.\n");
 872                 goto cleanup_helperoutops;
 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         synchronize_net();
 892 #ifdef CONFIG_SYSCTL
 893         unregister_sysctl_table(ip_ct_sysctl_header);
 894  cleanup_localinops:
 895 #endif
 896         nf_unregister_hook(&ip_conntrack_local_in_ops);
 897  cleanup_inoutandlocalops:
 898         nf_unregister_hook(&ip_conntrack_out_ops);
 899  cleanup_helperoutops:
 900         nf_unregister_hook(&ip_conntrack_helper_out_ops);
 901  cleanup_helperinops:
 902         nf_unregister_hook(&ip_conntrack_helper_in_ops);
 903  cleanup_inandlocalops:
 904         nf_unregister_hook(&ip_conntrack_local_out_ops);
 905  cleanup_inops:
 906         nf_unregister_hook(&ip_conntrack_in_ops);
 907  cleanup_defraglocalops:
 908         nf_unregister_hook(&ip_conntrack_defrag_local_out_ops);
 909  cleanup_defragops:
 910         nf_unregister_hook(&ip_conntrack_defrag_ops);
 911  cleanup_proc_stat:
 912 #ifdef CONFIG_PROC_FS
 913         remove_proc_entry("ip_conntrack", proc_net_stat);
 914  cleanup_proc_exp:
 915         proc_net_remove("ip_conntrack_expect");
 916  cleanup_proc:
 917         proc_net_remove("ip_conntrack");
 918  cleanup_init:
 919 #endif /* CONFIG_PROC_FS */
 920         ip_conntrack_cleanup();
 921  cleanup_nothing:
 922         return ret;
 923 }
 924
 925 /* FIXME: Allow NULL functions and sub in pointers to generic for
 926    them. --RR */
 927 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 928 {
 929         int ret = 0;
 930
 931         write_lock_bh(&ip_conntrack_lock);
 932         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 933                 ret = -EBUSY;
 934                 goto out;
 935         }
 936         ip_ct_protos[proto->proto] = proto;
 937  out:
 938         write_unlock_bh(&ip_conntrack_lock);
 939         return ret;
 940 }
 941
 942 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 943 {
 944         write_lock_bh(&ip_conntrack_lock);
 945         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 946         write_unlock_bh(&ip_conntrack_lock);
 947
 948         /* Somebody could be still looking at the proto in bh. */
 949         synchronize_net();
 950
 951         /* Remove all contrack entries for this protocol */
 952         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 953 }
 954
 955 static int __init init(void)
 956 {
 957         return init_or_cleanup(1);
 958 }
 959
 960 static void __exit fini(void)
 961 {
 962         init_or_cleanup(0);
 963 }
 964
 965 module_init(init);
 966 module_exit(fini);
 967
 968 /* Some modules need us, but don't depend directly on any symbol.
 969    They should call this. */
 970 void need_ip_conntrack(void)
 971 {
 972 }
 973
 974 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 975 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 976 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 977 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 978 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 979 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 980 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 981 #endif
 982 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 983 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 984 EXPORT_SYMBOL(ip_ct_get_tuple);
 985 EXPORT_SYMBOL(invert_tuplepr);
 986 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 987 EXPORT_SYMBOL(ip_conntrack_destroyed);
 988 EXPORT_SYMBOL(need_ip_conntrack);
 989 EXPORT_SYMBOL(ip_conntrack_helper_register);
 990 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 991 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 992 EXPORT_SYMBOL(ip_ct_refresh_acct);
 993
 994 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 995 EXPORT_SYMBOL(ip_conntrack_expect_put);
 996 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find_get);
 997 EXPORT_SYMBOL(ip_conntrack_expect_related);
 998 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 999 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
1000 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
1001 EXPORT_SYMBOL_GPL(__ip_ct_expect_unlink_destroy);
1002
1003 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
1004 EXPORT_SYMBOL(ip_ct_gather_frags);
1005 EXPORT_SYMBOL(ip_conntrack_htable_size);
1006 EXPORT_SYMBOL(ip_conntrack_lock);
1007 EXPORT_SYMBOL(ip_conntrack_hash);
1008 EXPORT_SYMBOL(ip_conntrack_untracked);
1009 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
1010 #ifdef CONFIG_IP_NF_NAT_NEEDED
1011 EXPORT_SYMBOL(ip_conntrack_tcp_update);
1012 #endif
1013
1014 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
1015 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
1016
1017 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
1018 EXPORT_SYMBOL_GPL(ip_conntrack_free);
1019 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
1020
1021 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
1022
1023 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
1024 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
1025 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
1026
1027 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
1028 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
1029 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
1030 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
1031     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
1032 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
1033 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
1034 #endif