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