net/ipv4/netfilter/ip_conntrack_standalone.c

   1 /* This file contains all the functions required for the standalone
   2    ip_conntrack module.
   3
   4    These are not required by the compatibility layer.
   5 */
   6
   7 /* (C) 1999-2001 Paul `Rusty' Russell
   8  * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/types.h>
  17 #include <linux/ip.h>
  18 #include <linux/netfilter.h>
  19 #include <linux/netfilter_ipv4.h>
  20 #include <linux/module.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/percpu.h>
  25 #ifdef CONFIG_SYSCTL
  26 #include <linux/sysctl.h>
  27 #endif
  28 #include <net/checksum.h>
  29 #include <net/ip.h>
  30 #include <net/route.h>
  31
  32 #define ASSERT_READ_LOCK(x)
  33 #define ASSERT_WRITE_LOCK(x)
  34
  35 #include <linux/netfilter_ipv4/ip_conntrack.h>
  36 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  37 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
  38 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
  39 #include <linux/netfilter_ipv4/listhelp.h>
  40
  41 #if 0
  42 #define DEBUGP printk
  43 #else
  44 #define DEBUGP(format, args...)
  45 #endif
  46
  47 MODULE_LICENSE("GPL");
  48
  49 extern atomic_t ip_conntrack_count;
  50 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  51
  52 static int kill_proto(struct ip_conntrack *i, void *data)
  53 {
  54         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  55                         *((u_int8_t *) data));
  56 }
  57
  58 #ifdef CONFIG_PROC_FS
  59 static int
  60 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  61             struct ip_conntrack_protocol *proto)
  62 {
  63         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  64                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  65         return proto->print_tuple(s, tuple);
  66 }
  67
  68 #ifdef CONFIG_IP_NF_CT_ACCT
  69 static unsigned int
  70 seq_print_counters(struct seq_file *s,
  71                    const struct ip_conntrack_counter *counter)
  72 {
  73         return seq_printf(s, "packets=%llu bytes=%llu ",
  74                           (unsigned long long)counter->packets,
  75                           (unsigned long long)counter->bytes);
  76 }
  77 #else
  78 #define seq_print_counters(x, y)        0
  79 #endif
  80
  81 struct ct_iter_state {
  82         unsigned int bucket;
  83 };
  84
  85 static struct list_head *ct_get_first(struct seq_file *seq)
  86 {
  87         struct ct_iter_state *st = seq->private;
  88
  89         for (st->bucket = 0;
  90              st->bucket < ip_conntrack_htable_size;
  91              st->bucket++) {
  92                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  93                         return ip_conntrack_hash[st->bucket].next;
  94         }
  95         return NULL;
  96 }
  97
  98 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  99 {
 100         struct ct_iter_state *st = seq->private;
 101
 102         head = head->next;
 103         while (head == &ip_conntrack_hash[st->bucket]) {
 104                 if (++st->bucket >= ip_conntrack_htable_size)
 105                         return NULL;
 106                 head = ip_conntrack_hash[st->bucket].next;
 107         }
 108         return head;
 109 }
 110
 111 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 112 {
 113         struct list_head *head = ct_get_first(seq);
 114
 115         if (head)
 116                 while (pos && (head = ct_get_next(seq, head)))
 117                         pos--;
 118         return pos ? NULL : head;
 119 }
 120
 121 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 122 {
 123         read_lock_bh(&ip_conntrack_lock);
 124         return ct_get_idx(seq, *pos);
 125 }
 126
 127 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 128 {
 129         (*pos)++;
 130         return ct_get_next(s, v);
 131 }
 132
 133 static void ct_seq_stop(struct seq_file *s, void *v)
 134 {
 135         read_unlock_bh(&ip_conntrack_lock);
 136 }
 137
 138 static int ct_seq_show(struct seq_file *s, void *v)
 139 {
 140         const struct ip_conntrack_tuple_hash *hash = v;
 141         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 142         struct ip_conntrack_protocol *proto;
 143
 144         ASSERT_READ_LOCK(&ip_conntrack_lock);
 145         IP_NF_ASSERT(conntrack);
 146
 147         /* we only want to print DIR_ORIGINAL */
 148         if (DIRECTION(hash))
 149                 return 0;
 150
 151         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 152         IP_NF_ASSERT(proto);
 153
 154         if (seq_printf(s, "%-8s %u %ld ",
 155                       proto->name,
 156                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 157                       timer_pending(&conntrack->timeout)
 158                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 159                       : 0) != 0)
 160                 return -ENOSPC;
 161
 162         if (proto->print_conntrack(s, conntrack))
 163                 return -ENOSPC;
 164
 165         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 166                         proto))
 167                 return -ENOSPC;
 168
 169         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 170                 return -ENOSPC;
 171
 172         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 173                 if (seq_printf(s, "[UNREPLIED] "))
 174                         return -ENOSPC;
 175
 176         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 177                         proto))
 178                 return -ENOSPC;
 179
 180         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 181                 return -ENOSPC;
 182
 183         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 184                 if (seq_printf(s, "[ASSURED] "))
 185                         return -ENOSPC;
 186
 187 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 188         if (seq_printf(s, "mark=%u ", conntrack->mark))
 189                 return -ENOSPC;
 190 #endif
 191
 192 #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
 193         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 194                 return -ENOSPC;
 195 #endif
 196
 197         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 198                 return -ENOSPC;
 199
 200         return 0;
 201 }
 202
 203 static struct seq_operations ct_seq_ops = {
 204         .start = ct_seq_start,
 205         .next  = ct_seq_next,
 206         .stop  = ct_seq_stop,
 207         .show  = ct_seq_show
 208 };
 209
 210 static int ct_open(struct inode *inode, struct file *file)
 211 {
 212         struct seq_file *seq;
 213         struct ct_iter_state *st;
 214         int ret;
 215
 216         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 217         if (st == NULL)
 218                 return -ENOMEM;
 219         ret = seq_open(file, &ct_seq_ops);
 220         if (ret)
 221                 goto out_free;
 222         seq          = file->private_data;
 223         seq->private = st;
 224         memset(st, 0, sizeof(struct ct_iter_state));
 225         return ret;
 226 out_free:
 227         kfree(st);
 228         return ret;
 229 }
 230
 231 static struct file_operations ct_file_ops = {
 232         .owner   = THIS_MODULE,
 233         .open    = ct_open,
 234         .read    = seq_read,
 235         .llseek  = seq_lseek,
 236         .release = seq_release_private,
 237 };
 238
 239 /* expects */
 240 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 241 {
 242         struct list_head *e = &ip_conntrack_expect_list;
 243         loff_t i;
 244
 245         /* strange seq_file api calls stop even if we fail,
 246          * thus we need to grab lock since stop unlocks */
 247         read_lock_bh(&ip_conntrack_lock);
 248
 249         if (list_empty(e))
 250                 return NULL;
 251
 252         for (i = 0; i <= *pos; i++) {
 253                 e = e->next;
 254                 if (e == &ip_conntrack_expect_list)
 255                         return NULL;
 256         }
 257         return e;
 258 }
 259
 260 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 261 {
 262         struct list_head *e = v;
 263
 264         ++*pos;
 265         e = e->next;
 266
 267         if (e == &ip_conntrack_expect_list)
 268                 return NULL;
 269
 270         return e;
 271 }
 272
 273 static void exp_seq_stop(struct seq_file *s, void *v)
 274 {
 275         read_unlock_bh(&ip_conntrack_lock);
 276 }
 277
 278 static int exp_seq_show(struct seq_file *s, void *v)
 279 {
 280         struct ip_conntrack_expect *expect = v;
 281
 282         if (expect->timeout.function)
 283                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 284                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 285         else
 286                 seq_printf(s, "- ");
 287
 288         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
 289
 290         print_tuple(s, &expect->tuple,
 291                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
 292         return seq_putc(s, '\n');
 293 }
 294
 295 static struct seq_operations exp_seq_ops = {
 296         .start = exp_seq_start,
 297         .next = exp_seq_next,
 298         .stop = exp_seq_stop,
 299         .show = exp_seq_show
 300 };
 301
 302 static int exp_open(struct inode *inode, struct file *file)
 303 {
 304         return seq_open(file, &exp_seq_ops);
 305 }
 306
 307 static struct file_operations exp_file_ops = {
 308         .owner   = THIS_MODULE,
 309         .open    = exp_open,
 310         .read    = seq_read,
 311         .llseek  = seq_lseek,
 312         .release = seq_release
 313 };
 314
 315 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 316 {
 317         int cpu;
 318
 319         if (*pos == 0)
 320                 return SEQ_START_TOKEN;
 321
 322         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 323                 if (!cpu_possible(cpu))
 324                         continue;
 325                 *pos = cpu+1;
 326                 return &per_cpu(ip_conntrack_stat, cpu);
 327         }
 328
 329         return NULL;
 330 }
 331
 332 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 333 {
 334         int cpu;
 335
 336         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 337                 if (!cpu_possible(cpu))
 338                         continue;
 339                 *pos = cpu+1;
 340                 return &per_cpu(ip_conntrack_stat, cpu);
 341         }
 342
 343         return NULL;
 344 }
 345
 346 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 347 {
 348 }
 349
 350 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 351 {
 352         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
 353         struct ip_conntrack_stat *st = v;
 354
 355         if (v == SEQ_START_TOKEN) {
 356                 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");
 357                 return 0;
 358         }
 359
 360         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 361                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 362                    nr_conntracks,
 363                    st->searched,
 364                    st->found,
 365                    st->new,
 366                    st->invalid,
 367                    st->ignore,
 368                    st->delete,
 369                    st->delete_list,
 370                    st->insert,
 371                    st->insert_failed,
 372                    st->drop,
 373                    st->early_drop,
 374                    st->error,
 375
 376                    st->expect_new,
 377                    st->expect_create,
 378                    st->expect_delete
 379                 );
 380         return 0;
 381 }
 382
 383 static struct seq_operations ct_cpu_seq_ops = {
 384         .start  = ct_cpu_seq_start,
 385         .next   = ct_cpu_seq_next,
 386         .stop   = ct_cpu_seq_stop,
 387         .show   = ct_cpu_seq_show,
 388 };
 389
 390 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 391 {
 392         return seq_open(file, &ct_cpu_seq_ops);
 393 }
 394
 395 static struct file_operations ct_cpu_seq_fops = {
 396         .owner   = THIS_MODULE,
 397         .open    = ct_cpu_seq_open,
 398         .read    = seq_read,
 399         .llseek  = seq_lseek,
 400         .release = seq_release_private,
 401 };
 402 #endif
 403
 404 static unsigned int ip_confirm(unsigned int hooknum,
 405                                struct sk_buff **pskb,
 406                                const struct net_device *in,
 407                                const struct net_device *out,
 408                                int (*okfn)(struct sk_buff *))
 409 {
 410         /* We've seen it coming out the other side: confirm it */
 411         return ip_conntrack_confirm(pskb);
 412 }
 413
 414 static unsigned int ip_conntrack_help(unsigned int hooknum,
 415                                       struct sk_buff **pskb,
 416                                       const struct net_device *in,
 417                                       const struct net_device *out,
 418                                       int (*okfn)(struct sk_buff *))
 419 {
 420         struct ip_conntrack *ct;
 421         enum ip_conntrack_info ctinfo;
 422
 423         /* This is where we call the helper: as the packet goes out. */
 424         ct = ip_conntrack_get(*pskb, &ctinfo);
 425         if (ct && ct->helper && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) {
 426                 unsigned int ret;
 427                 ret = ct->helper->help(pskb, ct, ctinfo);
 428                 if (ret != NF_ACCEPT)
 429                         return ret;
 430         }
 431         return NF_ACCEPT;
 432 }
 433
 434 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 435                                         struct sk_buff **pskb,
 436                                         const struct net_device *in,
 437                                         const struct net_device *out,
 438                                         int (*okfn)(struct sk_buff *))
 439 {
 440 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
 441         /* Previously seen (loopback)?  Ignore.  Do this before
 442            fragment check. */
 443         if ((*pskb)->nfct)
 444                 return NF_ACCEPT;
 445 #endif
 446
 447         /* Gather fragments. */
 448         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
 449                 *pskb = ip_ct_gather_frags(*pskb,
 450                                            hooknum == NF_IP_PRE_ROUTING ?
 451                                            IP_DEFRAG_CONNTRACK_IN :
 452                                            IP_DEFRAG_CONNTRACK_OUT);
 453                 if (!*pskb)
 454                         return NF_STOLEN;
 455         }
 456         return NF_ACCEPT;
 457 }
 458
 459 static unsigned int ip_conntrack_local(unsigned int hooknum,
 460                                        struct sk_buff **pskb,
 461                                        const struct net_device *in,
 462                                        const struct net_device *out,
 463                                        int (*okfn)(struct sk_buff *))
 464 {
 465         /* root is playing with raw sockets. */
 466         if ((*pskb)->len < sizeof(struct iphdr)
 467             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 468                 if (net_ratelimit())
 469                         printk("ipt_hook: happy cracking.\n");
 470                 return NF_ACCEPT;
 471         }
 472         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 473 }
 474
 475 /* Connection tracking may drop packets, but never alters them, so
 476    make it the first hook. */
 477 static struct nf_hook_ops ip_conntrack_ops[] = {
 478         {
 479                 .hook           = ip_conntrack_defrag,
 480                 .owner          = THIS_MODULE,
 481                 .pf             = PF_INET,
 482                 .hooknum        = NF_IP_PRE_ROUTING,
 483                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 484         },
 485         {
 486                 .hook           = ip_conntrack_in,
 487                 .owner          = THIS_MODULE,
 488                 .pf             = PF_INET,
 489                 .hooknum        = NF_IP_PRE_ROUTING,
 490                 .priority       = NF_IP_PRI_CONNTRACK,
 491         },
 492         {
 493                 .hook           = ip_conntrack_defrag,
 494                 .owner          = THIS_MODULE,
 495                 .pf             = PF_INET,
 496                 .hooknum        = NF_IP_LOCAL_OUT,
 497                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 498         },
 499         {
 500                 .hook           = ip_conntrack_local,
 501                 .owner          = THIS_MODULE,
 502                 .pf             = PF_INET,
 503                 .hooknum        = NF_IP_LOCAL_OUT,
 504                 .priority       = NF_IP_PRI_CONNTRACK,
 505         },
 506         {
 507                 .hook           = ip_conntrack_help,
 508                 .owner          = THIS_MODULE,
 509                 .pf             = PF_INET,
 510                 .hooknum        = NF_IP_POST_ROUTING,
 511                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 512         },
 513         {
 514                 .hook           = ip_conntrack_help,
 515                 .owner          = THIS_MODULE,
 516                 .pf             = PF_INET,
 517                 .hooknum        = NF_IP_LOCAL_IN,
 518                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 519         },
 520         {
 521                 .hook           = ip_confirm,
 522                 .owner          = THIS_MODULE,
 523                 .pf             = PF_INET,
 524                 .hooknum        = NF_IP_POST_ROUTING,
 525                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 526         },
 527         {
 528                 .hook           = ip_confirm,
 529                 .owner          = THIS_MODULE,
 530                 .pf             = PF_INET,
 531                 .hooknum        = NF_IP_LOCAL_IN,
 532                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 533         },
 534 };
 535
 536 /* Sysctl support */
 537
 538 #ifdef CONFIG_SYSCTL
 539
 540 /* From ip_conntrack_core.c */
 541 extern int ip_conntrack_max;
 542 extern unsigned int ip_conntrack_htable_size;
 543
 544 /* From ip_conntrack_proto_tcp.c */
 545 extern unsigned int ip_ct_tcp_timeout_syn_sent;
 546 extern unsigned int ip_ct_tcp_timeout_syn_recv;
 547 extern unsigned int ip_ct_tcp_timeout_established;
 548 extern unsigned int ip_ct_tcp_timeout_fin_wait;
 549 extern unsigned int ip_ct_tcp_timeout_close_wait;
 550 extern unsigned int ip_ct_tcp_timeout_last_ack;
 551 extern unsigned int ip_ct_tcp_timeout_time_wait;
 552 extern unsigned int ip_ct_tcp_timeout_close;
 553 extern unsigned int ip_ct_tcp_timeout_max_retrans;
 554 extern int ip_ct_tcp_loose;
 555 extern int ip_ct_tcp_be_liberal;
 556 extern int ip_ct_tcp_max_retrans;
 557
 558 /* From ip_conntrack_proto_udp.c */
 559 extern unsigned int ip_ct_udp_timeout;
 560 extern unsigned int ip_ct_udp_timeout_stream;
 561
 562 /* From ip_conntrack_proto_icmp.c */
 563 extern unsigned int ip_ct_icmp_timeout;
 564
 565 /* From ip_conntrack_proto_icmp.c */
 566 extern unsigned int ip_ct_generic_timeout;
 567
 568 /* Log invalid packets of a given protocol */
 569 static int log_invalid_proto_min = 0;
 570 static int log_invalid_proto_max = 255;
 571
 572 int ip_conntrack_checksum = 1;
 573
 574 static struct ctl_table_header *ip_ct_sysctl_header;
 575
 576 static ctl_table ip_ct_sysctl_table[] = {
 577         {
 578                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 579                 .procname       = "ip_conntrack_max",
 580                 .data           = &ip_conntrack_max,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec,
 584         },
 585         {
 586                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 587                 .procname       = "ip_conntrack_count",
 588                 .data           = &ip_conntrack_count,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0444,
 591                 .proc_handler   = &proc_dointvec,
 592         },
 593         {
 594                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 595                 .procname       = "ip_conntrack_buckets",
 596                 .data           = &ip_conntrack_htable_size,
 597                 .maxlen         = sizeof(unsigned int),
 598                 .mode           = 0444,
 599                 .proc_handler   = &proc_dointvec,
 600         },
 601         {
 602                 .ctl_name       = NET_IPV4_NF_CONNTRACK_CHECKSUM,
 603                 .procname       = "ip_conntrack_checksum",
 604                 .data           = &ip_conntrack_checksum,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = &proc_dointvec,
 608         },
 609         {
 610                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 611                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 612                 .data           = &ip_ct_tcp_timeout_syn_sent,
 613                 .maxlen         = sizeof(unsigned int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec_jiffies,
 616         },
 617         {
 618                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 619                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 620                 .data           = &ip_ct_tcp_timeout_syn_recv,
 621                 .maxlen         = sizeof(unsigned int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec_jiffies,
 624         },
 625         {
 626                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 627                 .procname       = "ip_conntrack_tcp_timeout_established",
 628                 .data           = &ip_ct_tcp_timeout_established,
 629                 .maxlen         = sizeof(unsigned int),
 630                 .mode           = 0644,
 631                 .proc_handler   = &proc_dointvec_jiffies,
 632         },
 633         {
 634                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 635                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 636                 .data           = &ip_ct_tcp_timeout_fin_wait,
 637                 .maxlen         = sizeof(unsigned int),
 638                 .mode           = 0644,
 639                 .proc_handler   = &proc_dointvec_jiffies,
 640         },
 641         {
 642                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 643                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 644                 .data           = &ip_ct_tcp_timeout_close_wait,
 645                 .maxlen         = sizeof(unsigned int),
 646                 .mode           = 0644,
 647                 .proc_handler   = &proc_dointvec_jiffies,
 648         },
 649         {
 650                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 651                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 652                 .data           = &ip_ct_tcp_timeout_last_ack,
 653                 .maxlen         = sizeof(unsigned int),
 654                 .mode           = 0644,
 655                 .proc_handler   = &proc_dointvec_jiffies,
 656         },
 657         {
 658                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 659                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 660                 .data           = &ip_ct_tcp_timeout_time_wait,
 661                 .maxlen         = sizeof(unsigned int),
 662                 .mode           = 0644,
 663                 .proc_handler   = &proc_dointvec_jiffies,
 664         },
 665         {
 666                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 667                 .procname       = "ip_conntrack_tcp_timeout_close",
 668                 .data           = &ip_ct_tcp_timeout_close,
 669                 .maxlen         = sizeof(unsigned int),
 670                 .mode           = 0644,
 671                 .proc_handler   = &proc_dointvec_jiffies,
 672         },
 673         {
 674                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 675                 .procname       = "ip_conntrack_udp_timeout",
 676                 .data           = &ip_ct_udp_timeout,
 677                 .maxlen         = sizeof(unsigned int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec_jiffies,
 680         },
 681         {
 682                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 683                 .procname       = "ip_conntrack_udp_timeout_stream",
 684                 .data           = &ip_ct_udp_timeout_stream,
 685                 .maxlen         = sizeof(unsigned int),
 686                 .mode           = 0644,
 687                 .proc_handler   = &proc_dointvec_jiffies,
 688         },
 689         {
 690                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 691                 .procname       = "ip_conntrack_icmp_timeout",
 692                 .data           = &ip_ct_icmp_timeout,
 693                 .maxlen         = sizeof(unsigned int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_dointvec_jiffies,
 696         },
 697         {
 698                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 699                 .procname       = "ip_conntrack_generic_timeout",
 700                 .data           = &ip_ct_generic_timeout,
 701                 .maxlen         = sizeof(unsigned int),
 702                 .mode           = 0644,
 703                 .proc_handler   = &proc_dointvec_jiffies,
 704         },
 705         {
 706                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 707                 .procname       = "ip_conntrack_log_invalid",
 708                 .data           = &ip_ct_log_invalid,
 709                 .maxlen         = sizeof(unsigned int),
 710                 .mode           = 0644,
 711                 .proc_handler   = &proc_dointvec_minmax,
 712                 .strategy       = &sysctl_intvec,
 713                 .extra1         = &log_invalid_proto_min,
 714                 .extra2         = &log_invalid_proto_max,
 715         },
 716         {
 717                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 718                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 719                 .data           = &ip_ct_tcp_timeout_max_retrans,
 720                 .maxlen         = sizeof(unsigned int),
 721                 .mode           = 0644,
 722                 .proc_handler   = &proc_dointvec_jiffies,
 723         },
 724         {
 725                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 726                 .procname       = "ip_conntrack_tcp_loose",
 727                 .data           = &ip_ct_tcp_loose,
 728                 .maxlen         = sizeof(unsigned int),
 729                 .mode           = 0644,
 730                 .proc_handler   = &proc_dointvec,
 731         },
 732         {
 733                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 734                 .procname       = "ip_conntrack_tcp_be_liberal",
 735                 .data           = &ip_ct_tcp_be_liberal,
 736                 .maxlen         = sizeof(unsigned int),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_dointvec,
 739         },
 740         {
 741                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 742                 .procname       = "ip_conntrack_tcp_max_retrans",
 743                 .data           = &ip_ct_tcp_max_retrans,
 744                 .maxlen         = sizeof(unsigned int),
 745                 .mode           = 0644,
 746                 .proc_handler   = &proc_dointvec,
 747         },
 748         { .ctl_name = 0 }
 749 };
 750
 751 #define NET_IP_CONNTRACK_MAX 2089
 752
 753 static ctl_table ip_ct_netfilter_table[] = {
 754         {
 755                 .ctl_name       = NET_IPV4_NETFILTER,
 756                 .procname       = "netfilter",
 757                 .mode           = 0555,
 758                 .child          = ip_ct_sysctl_table,
 759         },
 760         {
 761                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 762                 .procname       = "ip_conntrack_max",
 763                 .data           = &ip_conntrack_max,
 764                 .maxlen         = sizeof(int),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_dointvec
 767         },
 768         { .ctl_name = 0 }
 769 };
 770
 771 static ctl_table ip_ct_ipv4_table[] = {
 772         {
 773                 .ctl_name       = NET_IPV4,
 774                 .procname       = "ipv4",
 775                 .mode           = 0555,
 776                 .child          = ip_ct_netfilter_table,
 777         },
 778         { .ctl_name = 0 }
 779 };
 780
 781 static ctl_table ip_ct_net_table[] = {
 782         {
 783                 .ctl_name       = CTL_NET,
 784                 .procname       = "net",
 785                 .mode           = 0555,
 786                 .child          = ip_ct_ipv4_table,
 787         },
 788         { .ctl_name = 0 }
 789 };
 790
 791 EXPORT_SYMBOL(ip_ct_log_invalid);
 792 #endif /* CONFIG_SYSCTL */
 793
 794 /* FIXME: Allow NULL functions and sub in pointers to generic for
 795    them. --RR */
 796 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 797 {
 798         int ret = 0;
 799
 800         write_lock_bh(&ip_conntrack_lock);
 801         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 802                 ret = -EBUSY;
 803                 goto out;
 804         }
 805         ip_ct_protos[proto->proto] = proto;
 806  out:
 807         write_unlock_bh(&ip_conntrack_lock);
 808         return ret;
 809 }
 810
 811 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 812 {
 813         write_lock_bh(&ip_conntrack_lock);
 814         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 815         write_unlock_bh(&ip_conntrack_lock);
 816
 817         /* Somebody could be still looking at the proto in bh. */
 818         synchronize_net();
 819
 820         /* Remove all contrack entries for this protocol */
 821         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 822 }
 823
 824 static int __init ip_conntrack_standalone_init(void)
 825 {
 826 #ifdef CONFIG_PROC_FS
 827         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 828 #endif
 829         int ret = 0;
 830
 831         ret = ip_conntrack_init();
 832         if (ret < 0)
 833                 return ret;
 834
 835 #ifdef CONFIG_PROC_FS
 836         ret = -ENOMEM;
 837         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 838         if (!proc) goto cleanup_init;
 839
 840         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 841                                         &exp_file_ops);
 842         if (!proc_exp) goto cleanup_proc;
 843
 844         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 845         if (!proc_stat)
 846                 goto cleanup_proc_exp;
 847
 848         proc_stat->proc_fops = &ct_cpu_seq_fops;
 849         proc_stat->owner = THIS_MODULE;
 850 #endif
 851
 852         ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 853         if (ret < 0) {
 854                 printk("ip_conntrack: can't register hooks.\n");
 855                 goto cleanup_proc_stat;
 856         }
 857 #ifdef CONFIG_SYSCTL
 858         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 859         if (ip_ct_sysctl_header == NULL) {
 860                 printk("ip_conntrack: can't register to sysctl.\n");
 861                 ret = -ENOMEM;
 862                 goto cleanup_hooks;
 863         }
 864 #endif
 865         return ret;
 866
 867 #ifdef CONFIG_SYSCTL
 868  cleanup_hooks:
 869         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 870 #endif
 871  cleanup_proc_stat:
 872 #ifdef CONFIG_PROC_FS
 873         remove_proc_entry("ip_conntrack", proc_net_stat);
 874  cleanup_proc_exp:
 875         proc_net_remove("ip_conntrack_expect");
 876  cleanup_proc:
 877         proc_net_remove("ip_conntrack");
 878  cleanup_init:
 879 #endif /* CONFIG_PROC_FS */
 880         ip_conntrack_cleanup();
 881         return ret;
 882 }
 883
 884 static void __exit ip_conntrack_standalone_fini(void)
 885 {
 886         synchronize_net();
 887 #ifdef CONFIG_SYSCTL
 888         unregister_sysctl_table(ip_ct_sysctl_header);
 889 #endif
 890         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 891 #ifdef CONFIG_PROC_FS
 892         remove_proc_entry("ip_conntrack", proc_net_stat);
 893         proc_net_remove("ip_conntrack_expect");
 894         proc_net_remove("ip_conntrack");
 895 #endif /* CONFIG_PROC_FS */
 896         ip_conntrack_cleanup();
 897 }
 898
 899 module_init(ip_conntrack_standalone_init);
 900 module_exit(ip_conntrack_standalone_fini);
 901
 902 /* Some modules need us, but don't depend directly on any symbol.
 903    They should call this. */
 904 void need_conntrack(void)
 905 {
 906 }
 907
 908 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 909 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 910 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 911 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 912 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 913 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 914 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 915 #endif
 916 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 917 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 918 EXPORT_SYMBOL(ip_ct_get_tuple);
 919 EXPORT_SYMBOL(invert_tuplepr);
 920 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 921 EXPORT_SYMBOL(ip_conntrack_destroyed);
 922 EXPORT_SYMBOL(need_conntrack);
 923 EXPORT_SYMBOL(ip_conntrack_helper_register);
 924 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 925 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 926 EXPORT_SYMBOL(__ip_ct_refresh_acct);
 927
 928 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 929 EXPORT_SYMBOL(ip_conntrack_expect_put);
 930 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
 931 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find);
 932 EXPORT_SYMBOL(ip_conntrack_expect_related);
 933 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 934 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 935 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 936
 937 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 938 EXPORT_SYMBOL(ip_ct_gather_frags);
 939 EXPORT_SYMBOL(ip_conntrack_htable_size);
 940 EXPORT_SYMBOL(ip_conntrack_lock);
 941 EXPORT_SYMBOL(ip_conntrack_hash);
 942 EXPORT_SYMBOL(ip_conntrack_untracked);
 943 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
 944 #ifdef CONFIG_IP_NF_NAT_NEEDED
 945 EXPORT_SYMBOL(ip_conntrack_tcp_update);
 946 #endif
 947
 948 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
 949 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
 950
 951 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
 952 EXPORT_SYMBOL_GPL(ip_conntrack_free);
 953 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
 954
 955 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
 956
 957 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
 958 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
 959 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 960
 961 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
 962 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
 963 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
 964 EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
 965 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 966     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 967 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
 968 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
 969 #endif