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/types.h>
  16 #include <linux/ip.h>
  17 #include <linux/netfilter.h>
  18 #include <linux/netfilter_ipv4.h>
  19 #include <linux/module.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/percpu.h>
  24 #ifdef CONFIG_SYSCTL
  25 #include <linux/sysctl.h>
  26 #endif
  27 #include <net/checksum.h>
  28 #include <net/ip.h>
  29 #include <net/route.h>
  30
  31 #include <linux/netfilter_ipv4/ip_conntrack.h>
  32 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  33 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
  34 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
  35
  36 #if 0
  37 #define DEBUGP printk
  38 #else
  39 #define DEBUGP(format, args...)
  40 #endif
  41
  42 MODULE_LICENSE("GPL");
  43
  44 extern atomic_t ip_conntrack_count;
  45 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  46
  47 static int kill_proto(struct ip_conntrack *i, void *data)
  48 {
  49         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  50                         *((u_int8_t *) data));
  51 }
  52
  53 #ifdef CONFIG_PROC_FS
  54 static int
  55 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  56             struct ip_conntrack_protocol *proto)
  57 {
  58         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  59                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  60         return proto->print_tuple(s, tuple);
  61 }
  62
  63 #ifdef CONFIG_IP_NF_CT_ACCT
  64 static unsigned int
  65 seq_print_counters(struct seq_file *s,
  66                    const struct ip_conntrack_counter *counter)
  67 {
  68         return seq_printf(s, "packets=%llu bytes=%llu ",
  69                           (unsigned long long)counter->packets,
  70                           (unsigned long long)counter->bytes);
  71 }
  72 #else
  73 #define seq_print_counters(x, y)        0
  74 #endif
  75
  76 struct ct_iter_state {
  77         unsigned int bucket;
  78 };
  79
  80 static struct list_head *ct_get_first(struct seq_file *seq)
  81 {
  82         struct ct_iter_state *st = seq->private;
  83
  84         for (st->bucket = 0;
  85              st->bucket < ip_conntrack_htable_size;
  86              st->bucket++) {
  87                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  88                         return ip_conntrack_hash[st->bucket].next;
  89         }
  90         return NULL;
  91 }
  92
  93 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  94 {
  95         struct ct_iter_state *st = seq->private;
  96
  97         head = head->next;
  98         while (head == &ip_conntrack_hash[st->bucket]) {
  99                 if (++st->bucket >= ip_conntrack_htable_size)
 100                         return NULL;
 101                 head = ip_conntrack_hash[st->bucket].next;
 102         }
 103         return head;
 104 }
 105
 106 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 107 {
 108         struct list_head *head = ct_get_first(seq);
 109
 110         if (head)
 111                 while (pos && (head = ct_get_next(seq, head)))
 112                         pos--;
 113         return pos ? NULL : head;
 114 }
 115
 116 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 117 {
 118         read_lock_bh(&ip_conntrack_lock);
 119         return ct_get_idx(seq, *pos);
 120 }
 121
 122 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 123 {
 124         (*pos)++;
 125         return ct_get_next(s, v);
 126 }
 127
 128 static void ct_seq_stop(struct seq_file *s, void *v)
 129 {
 130         read_unlock_bh(&ip_conntrack_lock);
 131 }
 132
 133 static int ct_seq_show(struct seq_file *s, void *v)
 134 {
 135         const struct ip_conntrack_tuple_hash *hash = v;
 136         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 137         struct ip_conntrack_protocol *proto;
 138
 139         IP_NF_ASSERT(conntrack);
 140
 141         /* we only want to print DIR_ORIGINAL */
 142         if (DIRECTION(hash))
 143                 return 0;
 144
 145         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 146         IP_NF_ASSERT(proto);
 147
 148         if (seq_printf(s, "%-8s %u %ld ",
 149                       proto->name,
 150                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 151                       timer_pending(&conntrack->timeout)
 152                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 153                       : 0) != 0)
 154                 return -ENOSPC;
 155
 156         if (proto->print_conntrack(s, conntrack))
 157                 return -ENOSPC;
 158
 159         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 160                         proto))
 161                 return -ENOSPC;
 162
 163         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 164                 return -ENOSPC;
 165
 166         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 167                 if (seq_printf(s, "[UNREPLIED] "))
 168                         return -ENOSPC;
 169
 170         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 171                         proto))
 172                 return -ENOSPC;
 173
 174         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 175                 return -ENOSPC;
 176
 177         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 178                 if (seq_printf(s, "[ASSURED] "))
 179                         return -ENOSPC;
 180
 181 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 182         if (seq_printf(s, "mark=%u ", conntrack->mark))
 183                 return -ENOSPC;
 184 #endif
 185
 186 #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
 187         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 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 && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) {
 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_conntrack_local(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         /* root is playing with raw sockets. */
 460         if ((*pskb)->len < sizeof(struct iphdr)
 461             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 462                 if (net_ratelimit())
 463                         printk("ipt_hook: happy cracking.\n");
 464                 return NF_ACCEPT;
 465         }
 466         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 467 }
 468
 469 /* Connection tracking may drop packets, but never alters them, so
 470    make it the first hook. */
 471 static struct nf_hook_ops ip_conntrack_ops[] = {
 472         {
 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                 .hook           = ip_conntrack_in,
 481                 .owner          = THIS_MODULE,
 482                 .pf             = PF_INET,
 483                 .hooknum        = NF_IP_PRE_ROUTING,
 484                 .priority       = NF_IP_PRI_CONNTRACK,
 485         },
 486         {
 487                 .hook           = ip_conntrack_defrag,
 488                 .owner          = THIS_MODULE,
 489                 .pf             = PF_INET,
 490                 .hooknum        = NF_IP_LOCAL_OUT,
 491                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 492         },
 493         {
 494                 .hook           = ip_conntrack_local,
 495                 .owner          = THIS_MODULE,
 496                 .pf             = PF_INET,
 497                 .hooknum        = NF_IP_LOCAL_OUT,
 498                 .priority       = NF_IP_PRI_CONNTRACK,
 499         },
 500         {
 501                 .hook           = ip_conntrack_help,
 502                 .owner          = THIS_MODULE,
 503                 .pf             = PF_INET,
 504                 .hooknum        = NF_IP_POST_ROUTING,
 505                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 506         },
 507         {
 508                 .hook           = ip_conntrack_help,
 509                 .owner          = THIS_MODULE,
 510                 .pf             = PF_INET,
 511                 .hooknum        = NF_IP_LOCAL_IN,
 512                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 513         },
 514         {
 515                 .hook           = ip_confirm,
 516                 .owner          = THIS_MODULE,
 517                 .pf             = PF_INET,
 518                 .hooknum        = NF_IP_POST_ROUTING,
 519                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 520         },
 521         {
 522                 .hook           = ip_confirm,
 523                 .owner          = THIS_MODULE,
 524                 .pf             = PF_INET,
 525                 .hooknum        = NF_IP_LOCAL_IN,
 526                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 527         },
 528 };
 529
 530 /* Sysctl support */
 531
 532 int ip_conntrack_checksum __read_mostly = 1;
 533
 534 #ifdef CONFIG_SYSCTL
 535
 536 /* From ip_conntrack_core.c */
 537 extern int ip_conntrack_max;
 538 extern unsigned int ip_conntrack_htable_size;
 539
 540 /* From ip_conntrack_proto_tcp.c */
 541 extern unsigned int ip_ct_tcp_timeout_syn_sent;
 542 extern unsigned int ip_ct_tcp_timeout_syn_recv;
 543 extern unsigned int ip_ct_tcp_timeout_established;
 544 extern unsigned int ip_ct_tcp_timeout_fin_wait;
 545 extern unsigned int ip_ct_tcp_timeout_close_wait;
 546 extern unsigned int ip_ct_tcp_timeout_last_ack;
 547 extern unsigned int ip_ct_tcp_timeout_time_wait;
 548 extern unsigned int ip_ct_tcp_timeout_close;
 549 extern unsigned int ip_ct_tcp_timeout_max_retrans;
 550 extern int ip_ct_tcp_loose;
 551 extern int ip_ct_tcp_be_liberal;
 552 extern int ip_ct_tcp_max_retrans;
 553
 554 /* From ip_conntrack_proto_udp.c */
 555 extern unsigned int ip_ct_udp_timeout;
 556 extern unsigned int ip_ct_udp_timeout_stream;
 557
 558 /* From ip_conntrack_proto_icmp.c */
 559 extern unsigned int ip_ct_icmp_timeout;
 560
 561 /* From ip_conntrack_proto_generic.c */
 562 extern unsigned int ip_ct_generic_timeout;
 563
 564 /* Log invalid packets of a given protocol */
 565 static int log_invalid_proto_min = 0;
 566 static int log_invalid_proto_max = 255;
 567
 568 static struct ctl_table_header *ip_ct_sysctl_header;
 569
 570 static ctl_table ip_ct_sysctl_table[] = {
 571         {
 572                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 573                 .procname       = "ip_conntrack_max",
 574                 .data           = &ip_conntrack_max,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec,
 578         },
 579         {
 580                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 581                 .procname       = "ip_conntrack_count",
 582                 .data           = &ip_conntrack_count,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0444,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587         {
 588                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 589                 .procname       = "ip_conntrack_buckets",
 590                 .data           = &ip_conntrack_htable_size,
 591                 .maxlen         = sizeof(unsigned int),
 592                 .mode           = 0444,
 593                 .proc_handler   = &proc_dointvec,
 594         },
 595         {
 596                 .ctl_name       = NET_IPV4_NF_CONNTRACK_CHECKSUM,
 597                 .procname       = "ip_conntrack_checksum",
 598                 .data           = &ip_conntrack_checksum,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec,
 602         },
 603         {
 604                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 605                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 606                 .data           = &ip_ct_tcp_timeout_syn_sent,
 607                 .maxlen         = sizeof(unsigned int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec_jiffies,
 610         },
 611         {
 612                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 613                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 614                 .data           = &ip_ct_tcp_timeout_syn_recv,
 615                 .maxlen         = sizeof(unsigned int),
 616                 .mode           = 0644,
 617                 .proc_handler   = &proc_dointvec_jiffies,
 618         },
 619         {
 620                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 621                 .procname       = "ip_conntrack_tcp_timeout_established",
 622                 .data           = &ip_ct_tcp_timeout_established,
 623                 .maxlen         = sizeof(unsigned int),
 624                 .mode           = 0644,
 625                 .proc_handler   = &proc_dointvec_jiffies,
 626         },
 627         {
 628                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 629                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 630                 .data           = &ip_ct_tcp_timeout_fin_wait,
 631                 .maxlen         = sizeof(unsigned int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec_jiffies,
 634         },
 635         {
 636                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 637                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 638                 .data           = &ip_ct_tcp_timeout_close_wait,
 639                 .maxlen         = sizeof(unsigned int),
 640                 .mode           = 0644,
 641                 .proc_handler   = &proc_dointvec_jiffies,
 642         },
 643         {
 644                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 645                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 646                 .data           = &ip_ct_tcp_timeout_last_ack,
 647                 .maxlen         = sizeof(unsigned int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec_jiffies,
 650         },
 651         {
 652                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 653                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 654                 .data           = &ip_ct_tcp_timeout_time_wait,
 655                 .maxlen         = sizeof(unsigned int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec_jiffies,
 658         },
 659         {
 660                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 661                 .procname       = "ip_conntrack_tcp_timeout_close",
 662                 .data           = &ip_ct_tcp_timeout_close,
 663                 .maxlen         = sizeof(unsigned int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec_jiffies,
 666         },
 667         {
 668                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 669                 .procname       = "ip_conntrack_udp_timeout",
 670                 .data           = &ip_ct_udp_timeout,
 671                 .maxlen         = sizeof(unsigned int),
 672                 .mode           = 0644,
 673                 .proc_handler   = &proc_dointvec_jiffies,
 674         },
 675         {
 676                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 677                 .procname       = "ip_conntrack_udp_timeout_stream",
 678                 .data           = &ip_ct_udp_timeout_stream,
 679                 .maxlen         = sizeof(unsigned int),
 680                 .mode           = 0644,
 681                 .proc_handler   = &proc_dointvec_jiffies,
 682         },
 683         {
 684                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 685                 .procname       = "ip_conntrack_icmp_timeout",
 686                 .data           = &ip_ct_icmp_timeout,
 687                 .maxlen         = sizeof(unsigned int),
 688                 .mode           = 0644,
 689                 .proc_handler   = &proc_dointvec_jiffies,
 690         },
 691         {
 692                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 693                 .procname       = "ip_conntrack_generic_timeout",
 694                 .data           = &ip_ct_generic_timeout,
 695                 .maxlen         = sizeof(unsigned int),
 696                 .mode           = 0644,
 697                 .proc_handler   = &proc_dointvec_jiffies,
 698         },
 699         {
 700                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 701                 .procname       = "ip_conntrack_log_invalid",
 702                 .data           = &ip_ct_log_invalid,
 703                 .maxlen         = sizeof(unsigned int),
 704                 .mode           = 0644,
 705                 .proc_handler   = &proc_dointvec_minmax,
 706                 .strategy       = &sysctl_intvec,
 707                 .extra1         = &log_invalid_proto_min,
 708                 .extra2         = &log_invalid_proto_max,
 709         },
 710         {
 711                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 712                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 713                 .data           = &ip_ct_tcp_timeout_max_retrans,
 714                 .maxlen         = sizeof(unsigned int),
 715                 .mode           = 0644,
 716                 .proc_handler   = &proc_dointvec_jiffies,
 717         },
 718         {
 719                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 720                 .procname       = "ip_conntrack_tcp_loose",
 721                 .data           = &ip_ct_tcp_loose,
 722                 .maxlen         = sizeof(unsigned int),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_dointvec,
 725         },
 726         {
 727                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 728                 .procname       = "ip_conntrack_tcp_be_liberal",
 729                 .data           = &ip_ct_tcp_be_liberal,
 730                 .maxlen         = sizeof(unsigned int),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_dointvec,
 733         },
 734         {
 735                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 736                 .procname       = "ip_conntrack_tcp_max_retrans",
 737                 .data           = &ip_ct_tcp_max_retrans,
 738                 .maxlen         = sizeof(unsigned int),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_dointvec,
 741         },
 742         { .ctl_name = 0 }
 743 };
 744
 745 #define NET_IP_CONNTRACK_MAX 2089
 746
 747 static ctl_table ip_ct_netfilter_table[] = {
 748         {
 749                 .ctl_name       = NET_IPV4_NETFILTER,
 750                 .procname       = "netfilter",
 751                 .mode           = 0555,
 752                 .child          = ip_ct_sysctl_table,
 753         },
 754         {
 755                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 756                 .procname       = "ip_conntrack_max",
 757                 .data           = &ip_conntrack_max,
 758                 .maxlen         = sizeof(int),
 759                 .mode           = 0644,
 760                 .proc_handler   = &proc_dointvec
 761         },
 762         { .ctl_name = 0 }
 763 };
 764
 765 static ctl_table ip_ct_ipv4_table[] = {
 766         {
 767                 .ctl_name       = NET_IPV4,
 768                 .procname       = "ipv4",
 769                 .mode           = 0555,
 770                 .child          = ip_ct_netfilter_table,
 771         },
 772         { .ctl_name = 0 }
 773 };
 774
 775 static ctl_table ip_ct_net_table[] = {
 776         {
 777                 .ctl_name       = CTL_NET,
 778                 .procname       = "net",
 779                 .mode           = 0555,
 780                 .child          = ip_ct_ipv4_table,
 781         },
 782         { .ctl_name = 0 }
 783 };
 784
 785 EXPORT_SYMBOL(ip_ct_log_invalid);
 786 #endif /* CONFIG_SYSCTL */
 787
 788 /* FIXME: Allow NULL functions and sub in pointers to generic for
 789    them. --RR */
 790 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 791 {
 792         int ret = 0;
 793
 794         write_lock_bh(&ip_conntrack_lock);
 795         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 796                 ret = -EBUSY;
 797                 goto out;
 798         }
 799         ip_ct_protos[proto->proto] = proto;
 800  out:
 801         write_unlock_bh(&ip_conntrack_lock);
 802         return ret;
 803 }
 804
 805 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 806 {
 807         write_lock_bh(&ip_conntrack_lock);
 808         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 809         write_unlock_bh(&ip_conntrack_lock);
 810
 811         /* Somebody could be still looking at the proto in bh. */
 812         synchronize_net();
 813
 814         /* Remove all contrack entries for this protocol */
 815         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 816 }
 817
 818 static int __init ip_conntrack_standalone_init(void)
 819 {
 820 #ifdef CONFIG_PROC_FS
 821         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 822 #endif
 823         int ret = 0;
 824
 825         ret = ip_conntrack_init();
 826         if (ret < 0)
 827                 return ret;
 828
 829 #ifdef CONFIG_PROC_FS
 830         ret = -ENOMEM;
 831         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 832         if (!proc) goto cleanup_init;
 833
 834         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 835                                         &exp_file_ops);
 836         if (!proc_exp) goto cleanup_proc;
 837
 838         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 839         if (!proc_stat)
 840                 goto cleanup_proc_exp;
 841
 842         proc_stat->proc_fops = &ct_cpu_seq_fops;
 843         proc_stat->owner = THIS_MODULE;
 844 #endif
 845
 846         ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 847         if (ret < 0) {
 848                 printk("ip_conntrack: can't register hooks.\n");
 849                 goto cleanup_proc_stat;
 850         }
 851 #ifdef CONFIG_SYSCTL
 852         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 853         if (ip_ct_sysctl_header == NULL) {
 854                 printk("ip_conntrack: can't register to sysctl.\n");
 855                 ret = -ENOMEM;
 856                 goto cleanup_hooks;
 857         }
 858 #endif
 859         return ret;
 860
 861 #ifdef CONFIG_SYSCTL
 862  cleanup_hooks:
 863         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 864 #endif
 865  cleanup_proc_stat:
 866 #ifdef CONFIG_PROC_FS
 867         remove_proc_entry("ip_conntrack", proc_net_stat);
 868  cleanup_proc_exp:
 869         proc_net_remove("ip_conntrack_expect");
 870  cleanup_proc:
 871         proc_net_remove("ip_conntrack");
 872  cleanup_init:
 873 #endif /* CONFIG_PROC_FS */
 874         ip_conntrack_cleanup();
 875         return ret;
 876 }
 877
 878 static void __exit ip_conntrack_standalone_fini(void)
 879 {
 880         synchronize_net();
 881 #ifdef CONFIG_SYSCTL
 882         unregister_sysctl_table(ip_ct_sysctl_header);
 883 #endif
 884         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 885 #ifdef CONFIG_PROC_FS
 886         remove_proc_entry("ip_conntrack", proc_net_stat);
 887         proc_net_remove("ip_conntrack_expect");
 888         proc_net_remove("ip_conntrack");
 889 #endif /* CONFIG_PROC_FS */
 890         ip_conntrack_cleanup();
 891 }
 892
 893 module_init(ip_conntrack_standalone_init);
 894 module_exit(ip_conntrack_standalone_fini);
 895
 896 /* Some modules need us, but don't depend directly on any symbol.
 897    They should call this. */
 898 void need_conntrack(void)
 899 {
 900 }
 901
 902 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 903 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 904 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 905 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 906 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 907 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 908 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 909 #endif
 910 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 911 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 912 EXPORT_SYMBOL(ip_ct_get_tuple);
 913 EXPORT_SYMBOL(invert_tuplepr);
 914 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 915 EXPORT_SYMBOL(ip_conntrack_destroyed);
 916 EXPORT_SYMBOL(need_conntrack);
 917 EXPORT_SYMBOL(ip_conntrack_helper_register);
 918 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 919 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 920 EXPORT_SYMBOL(__ip_ct_refresh_acct);
 921
 922 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 923 EXPORT_SYMBOL(ip_conntrack_expect_put);
 924 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
 925 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find_get);
 926 EXPORT_SYMBOL(ip_conntrack_expect_related);
 927 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 928 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 929 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 930
 931 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 932 EXPORT_SYMBOL(ip_ct_gather_frags);
 933 EXPORT_SYMBOL(ip_conntrack_htable_size);
 934 EXPORT_SYMBOL(ip_conntrack_lock);
 935 EXPORT_SYMBOL(ip_conntrack_hash);
 936 EXPORT_SYMBOL(ip_conntrack_untracked);
 937 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
 938 #ifdef CONFIG_IP_NF_NAT_NEEDED
 939 EXPORT_SYMBOL(ip_conntrack_tcp_update);
 940 #endif
 941
 942 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
 943 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
 944
 945 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
 946 EXPORT_SYMBOL_GPL(ip_conntrack_free);
 947 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
 948
 949 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
 950
 951 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
 952 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
 953 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 954
 955 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
 956 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
 957 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
 958 EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
 959 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 960     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 961 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
 962 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
 963 #endif