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
  39 #if 0
  40 #define DEBUGP printk
  41 #else
  42 #define DEBUGP(format, args...)
  43 #endif
  44
  45 MODULE_LICENSE("GPL");
  46
  47 extern atomic_t ip_conntrack_count;
  48 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  49
  50 static int kill_proto(struct ip_conntrack *i, void *data)
  51 {
  52         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  53                         *((u_int8_t *) data));
  54 }
  55
  56 #ifdef CONFIG_PROC_FS
  57 static int
  58 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  59             struct ip_conntrack_protocol *proto)
  60 {
  61         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  62                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  63         return proto->print_tuple(s, tuple);
  64 }
  65
  66 #ifdef CONFIG_IP_NF_CT_ACCT
  67 static unsigned int
  68 seq_print_counters(struct seq_file *s,
  69                    const struct ip_conntrack_counter *counter)
  70 {
  71         return seq_printf(s, "packets=%llu bytes=%llu ",
  72                           (unsigned long long)counter->packets,
  73                           (unsigned long long)counter->bytes);
  74 }
  75 #else
  76 #define seq_print_counters(x, y)        0
  77 #endif
  78
  79 struct ct_iter_state {
  80         unsigned int bucket;
  81 };
  82
  83 static struct list_head *ct_get_first(struct seq_file *seq)
  84 {
  85         struct ct_iter_state *st = seq->private;
  86
  87         for (st->bucket = 0;
  88              st->bucket < ip_conntrack_htable_size;
  89              st->bucket++) {
  90                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  91                         return ip_conntrack_hash[st->bucket].next;
  92         }
  93         return NULL;
  94 }
  95
  96 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  97 {
  98         struct ct_iter_state *st = seq->private;
  99
 100         head = head->next;
 101         while (head == &ip_conntrack_hash[st->bucket]) {
 102                 if (++st->bucket >= ip_conntrack_htable_size)
 103                         return NULL;
 104                 head = ip_conntrack_hash[st->bucket].next;
 105         }
 106         return head;
 107 }
 108
 109 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 110 {
 111         struct list_head *head = ct_get_first(seq);
 112
 113         if (head)
 114                 while (pos && (head = ct_get_next(seq, head)))
 115                         pos--;
 116         return pos ? NULL : head;
 117 }
 118
 119 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 120 {
 121         read_lock_bh(&ip_conntrack_lock);
 122         return ct_get_idx(seq, *pos);
 123 }
 124
 125 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 126 {
 127         (*pos)++;
 128         return ct_get_next(s, v);
 129 }
 130
 131 static void ct_seq_stop(struct seq_file *s, void *v)
 132 {
 133         read_unlock_bh(&ip_conntrack_lock);
 134 }
 135
 136 static int ct_seq_show(struct seq_file *s, void *v)
 137 {
 138         const struct ip_conntrack_tuple_hash *hash = v;
 139         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 140         struct ip_conntrack_protocol *proto;
 141
 142         ASSERT_READ_LOCK(&ip_conntrack_lock);
 143         IP_NF_ASSERT(conntrack);
 144
 145         /* we only want to print DIR_ORIGINAL */
 146         if (DIRECTION(hash))
 147                 return 0;
 148
 149         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 150         IP_NF_ASSERT(proto);
 151
 152         if (seq_printf(s, "%-8s %u %ld ",
 153                       proto->name,
 154                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 155                       timer_pending(&conntrack->timeout)
 156                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 157                       : 0) != 0)
 158                 return -ENOSPC;
 159
 160         if (proto->print_conntrack(s, conntrack))
 161                 return -ENOSPC;
 162
 163         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 164                         proto))
 165                 return -ENOSPC;
 166
 167         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 168                 return -ENOSPC;
 169
 170         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 171                 if (seq_printf(s, "[UNREPLIED] "))
 172                         return -ENOSPC;
 173
 174         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 175                         proto))
 176                 return -ENOSPC;
 177
 178         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 179                 return -ENOSPC;
 180
 181         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 182                 if (seq_printf(s, "[ASSURED] "))
 183                         return -ENOSPC;
 184
 185 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 186         if (seq_printf(s, "mark=%u ", conntrack->mark))
 187                 return -ENOSPC;
 188 #endif
 189
 190 #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
 191         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 192                 return -ENOSPC;
 193 #endif
 194
 195 #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
 196         if(conntrack->layer7.app_proto)
 197                 if (seq_printf(s, "l7proto=%s ",conntrack->layer7.app_proto))
 198                         return 1;
 199 #endif
 200
 201         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 202                 return -ENOSPC;
 203
 204         return 0;
 205 }
 206
 207 static struct seq_operations ct_seq_ops = {
 208         .start = ct_seq_start,
 209         .next  = ct_seq_next,
 210         .stop  = ct_seq_stop,
 211         .show  = ct_seq_show
 212 };
 213
 214 static int ct_open(struct inode *inode, struct file *file)
 215 {
 216         struct seq_file *seq;
 217         struct ct_iter_state *st;
 218         int ret;
 219
 220         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 221         if (st == NULL)
 222                 return -ENOMEM;
 223         ret = seq_open(file, &ct_seq_ops);
 224         if (ret)
 225                 goto out_free;
 226         seq          = file->private_data;
 227         seq->private = st;
 228         memset(st, 0, sizeof(struct ct_iter_state));
 229         return ret;
 230 out_free:
 231         kfree(st);
 232         return ret;
 233 }
 234
 235 static struct file_operations ct_file_ops = {
 236         .owner   = THIS_MODULE,
 237         .open    = ct_open,
 238         .read    = seq_read,
 239         .llseek  = seq_lseek,
 240         .release = seq_release_private,
 241 };
 242
 243 /* expects */
 244 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 245 {
 246         struct list_head *e = &ip_conntrack_expect_list;
 247         loff_t i;
 248
 249         /* strange seq_file api calls stop even if we fail,
 250          * thus we need to grab lock since stop unlocks */
 251         read_lock_bh(&ip_conntrack_lock);
 252
 253         if (list_empty(e))
 254                 return NULL;
 255
 256         for (i = 0; i <= *pos; i++) {
 257                 e = e->next;
 258                 if (e == &ip_conntrack_expect_list)
 259                         return NULL;
 260         }
 261         return e;
 262 }
 263
 264 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 265 {
 266         struct list_head *e = v;
 267
 268         ++*pos;
 269         e = e->next;
 270
 271         if (e == &ip_conntrack_expect_list)
 272                 return NULL;
 273
 274         return e;
 275 }
 276
 277 static void exp_seq_stop(struct seq_file *s, void *v)
 278 {
 279         read_unlock_bh(&ip_conntrack_lock);
 280 }
 281
 282 static int exp_seq_show(struct seq_file *s, void *v)
 283 {
 284         struct ip_conntrack_expect *expect = v;
 285
 286         if (expect->timeout.function)
 287                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 288                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 289         else
 290                 seq_printf(s, "- ");
 291
 292         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
 293
 294         print_tuple(s, &expect->tuple,
 295                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
 296         return seq_putc(s, '\n');
 297 }
 298
 299 static struct seq_operations exp_seq_ops = {
 300         .start = exp_seq_start,
 301         .next = exp_seq_next,
 302         .stop = exp_seq_stop,
 303         .show = exp_seq_show
 304 };
 305
 306 static int exp_open(struct inode *inode, struct file *file)
 307 {
 308         return seq_open(file, &exp_seq_ops);
 309 }
 310
 311 static struct file_operations exp_file_ops = {
 312         .owner   = THIS_MODULE,
 313         .open    = exp_open,
 314         .read    = seq_read,
 315         .llseek  = seq_lseek,
 316         .release = seq_release
 317 };
 318
 319 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 320 {
 321         int cpu;
 322
 323         if (*pos == 0)
 324                 return SEQ_START_TOKEN;
 325
 326         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 327                 if (!cpu_possible(cpu))
 328                         continue;
 329                 *pos = cpu+1;
 330                 return &per_cpu(ip_conntrack_stat, cpu);
 331         }
 332
 333         return NULL;
 334 }
 335
 336 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 337 {
 338         int cpu;
 339
 340         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 341                 if (!cpu_possible(cpu))
 342                         continue;
 343                 *pos = cpu+1;
 344                 return &per_cpu(ip_conntrack_stat, cpu);
 345         }
 346
 347         return NULL;
 348 }
 349
 350 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 351 {
 352 }
 353
 354 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 355 {
 356         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
 357         struct ip_conntrack_stat *st = v;
 358
 359         if (v == SEQ_START_TOKEN) {
 360                 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");
 361                 return 0;
 362         }
 363
 364         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 365                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 366                    nr_conntracks,
 367                    st->searched,
 368                    st->found,
 369                    st->new,
 370                    st->invalid,
 371                    st->ignore,
 372                    st->delete,
 373                    st->delete_list,
 374                    st->insert,
 375                    st->insert_failed,
 376                    st->drop,
 377                    st->early_drop,
 378                    st->error,
 379
 380                    st->expect_new,
 381                    st->expect_create,
 382                    st->expect_delete
 383                 );
 384         return 0;
 385 }
 386
 387 static struct seq_operations ct_cpu_seq_ops = {
 388         .start  = ct_cpu_seq_start,
 389         .next   = ct_cpu_seq_next,
 390         .stop   = ct_cpu_seq_stop,
 391         .show   = ct_cpu_seq_show,
 392 };
 393
 394 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 395 {
 396         return seq_open(file, &ct_cpu_seq_ops);
 397 }
 398
 399 static struct file_operations ct_cpu_seq_fops = {
 400         .owner   = THIS_MODULE,
 401         .open    = ct_cpu_seq_open,
 402         .read    = seq_read,
 403         .llseek  = seq_lseek,
 404         .release = seq_release_private,
 405 };
 406 #endif
 407
 408 static unsigned int ip_confirm(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         /* We've seen it coming out the other side: confirm it */
 415         return ip_conntrack_confirm(pskb);
 416 }
 417
 418 static unsigned int ip_conntrack_help(unsigned int hooknum,
 419                                       struct sk_buff **pskb,
 420                                       const struct net_device *in,
 421                                       const struct net_device *out,
 422                                       int (*okfn)(struct sk_buff *))
 423 {
 424         struct ip_conntrack *ct;
 425         enum ip_conntrack_info ctinfo;
 426
 427         /* This is where we call the helper: as the packet goes out. */
 428         ct = ip_conntrack_get(*pskb, &ctinfo);
 429         if (ct && ct->helper && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) {
 430                 unsigned int ret;
 431                 ret = ct->helper->help(pskb, ct, ctinfo);
 432                 if (ret != NF_ACCEPT)
 433                         return ret;
 434         }
 435         return NF_ACCEPT;
 436 }
 437
 438 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 439                                         struct sk_buff **pskb,
 440                                         const struct net_device *in,
 441                                         const struct net_device *out,
 442                                         int (*okfn)(struct sk_buff *))
 443 {
 444 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
 445         /* Previously seen (loopback)?  Ignore.  Do this before
 446            fragment check. */
 447         if ((*pskb)->nfct)
 448                 return NF_ACCEPT;
 449 #endif
 450
 451         /* Gather fragments. */
 452         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
 453                 *pskb = ip_ct_gather_frags(*pskb,
 454                                            hooknum == NF_IP_PRE_ROUTING ?
 455                                            IP_DEFRAG_CONNTRACK_IN :
 456                                            IP_DEFRAG_CONNTRACK_OUT);
 457                 if (!*pskb)
 458                         return NF_STOLEN;
 459         }
 460         return NF_ACCEPT;
 461 }
 462
 463 static unsigned int ip_conntrack_local(unsigned int hooknum,
 464                                        struct sk_buff **pskb,
 465                                        const struct net_device *in,
 466                                        const struct net_device *out,
 467                                        int (*okfn)(struct sk_buff *))
 468 {
 469         /* root is playing with raw sockets. */
 470         if ((*pskb)->len < sizeof(struct iphdr)
 471             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 472                 if (net_ratelimit())
 473                         printk("ipt_hook: happy cracking.\n");
 474                 return NF_ACCEPT;
 475         }
 476         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 477 }
 478
 479 /* Connection tracking may drop packets, but never alters them, so
 480    make it the first hook. */
 481 static struct nf_hook_ops ip_conntrack_ops[] = {
 482         {
 483                 .hook           = ip_conntrack_defrag,
 484                 .owner          = THIS_MODULE,
 485                 .pf             = PF_INET,
 486                 .hooknum        = NF_IP_PRE_ROUTING,
 487                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 488         },
 489         {
 490                 .hook           = ip_conntrack_in,
 491                 .owner          = THIS_MODULE,
 492                 .pf             = PF_INET,
 493                 .hooknum        = NF_IP_PRE_ROUTING,
 494                 .priority       = NF_IP_PRI_CONNTRACK,
 495         },
 496         {
 497                 .hook           = ip_conntrack_defrag,
 498                 .owner          = THIS_MODULE,
 499                 .pf             = PF_INET,
 500                 .hooknum        = NF_IP_LOCAL_OUT,
 501                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 502         },
 503         {
 504                 .hook           = ip_conntrack_local,
 505                 .owner          = THIS_MODULE,
 506                 .pf             = PF_INET,
 507                 .hooknum        = NF_IP_LOCAL_OUT,
 508                 .priority       = NF_IP_PRI_CONNTRACK,
 509         },
 510         {
 511                 .hook           = ip_conntrack_help,
 512                 .owner          = THIS_MODULE,
 513                 .pf             = PF_INET,
 514                 .hooknum        = NF_IP_POST_ROUTING,
 515                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 516         },
 517         {
 518                 .hook           = ip_conntrack_help,
 519                 .owner          = THIS_MODULE,
 520                 .pf             = PF_INET,
 521                 .hooknum        = NF_IP_LOCAL_IN,
 522                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 523         },
 524         {
 525                 .hook           = ip_confirm,
 526                 .owner          = THIS_MODULE,
 527                 .pf             = PF_INET,
 528                 .hooknum        = NF_IP_POST_ROUTING,
 529                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 530         },
 531         {
 532                 .hook           = ip_confirm,
 533                 .owner          = THIS_MODULE,
 534                 .pf             = PF_INET,
 535                 .hooknum        = NF_IP_LOCAL_IN,
 536                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 537         },
 538 };
 539
 540 /* Sysctl support */
 541
 542 int ip_conntrack_checksum __read_mostly = 1;
 543
 544 #ifdef CONFIG_SYSCTL
 545
 546 /* From ip_conntrack_core.c */
 547 extern int ip_conntrack_max;
 548 extern unsigned int ip_conntrack_htable_size;
 549
 550 /* From ip_conntrack_proto_tcp.c */
 551 extern unsigned int ip_ct_tcp_timeout_syn_sent;
 552 extern unsigned int ip_ct_tcp_timeout_syn_recv;
 553 extern unsigned int ip_ct_tcp_timeout_established;
 554 extern unsigned int ip_ct_tcp_timeout_fin_wait;
 555 extern unsigned int ip_ct_tcp_timeout_close_wait;
 556 extern unsigned int ip_ct_tcp_timeout_last_ack;
 557 extern unsigned int ip_ct_tcp_timeout_time_wait;
 558 extern unsigned int ip_ct_tcp_timeout_close;
 559 extern unsigned int ip_ct_tcp_timeout_max_retrans;
 560 extern int ip_ct_tcp_loose;
 561 extern int ip_ct_tcp_be_liberal;
 562 extern int ip_ct_tcp_max_retrans;
 563
 564 /* From ip_conntrack_proto_udp.c */
 565 extern unsigned int ip_ct_udp_timeout;
 566 extern unsigned int ip_ct_udp_timeout_stream;
 567
 568 /* From ip_conntrack_proto_icmp.c */
 569 extern unsigned int ip_ct_icmp_timeout;
 570
 571 /* From ip_conntrack_proto_generic.c */
 572 extern unsigned int ip_ct_generic_timeout;
 573
 574 /* Log invalid packets of a given protocol */
 575 static int log_invalid_proto_min = 0;
 576 static int log_invalid_proto_max = 255;
 577
 578 static struct ctl_table_header *ip_ct_sysctl_header;
 579
 580 static ctl_table ip_ct_sysctl_table[] = {
 581         {
 582                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 583                 .procname       = "ip_conntrack_max",
 584                 .data           = &ip_conntrack_max,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec,
 588         },
 589         {
 590                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 591                 .procname       = "ip_conntrack_count",
 592                 .data           = &ip_conntrack_count,
 593                 .maxlen         = sizeof(int),
 594                 .mode           = 0444,
 595                 .proc_handler   = &proc_dointvec,
 596         },
 597         {
 598                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 599                 .procname       = "ip_conntrack_buckets",
 600                 .data           = &ip_conntrack_htable_size,
 601                 .maxlen         = sizeof(unsigned int),
 602                 .mode           = 0444,
 603                 .proc_handler   = &proc_dointvec,
 604         },
 605         {
 606                 .ctl_name       = NET_IPV4_NF_CONNTRACK_CHECKSUM,
 607                 .procname       = "ip_conntrack_checksum",
 608                 .data           = &ip_conntrack_checksum,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec,
 612         },
 613         {
 614                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 615                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 616                 .data           = &ip_ct_tcp_timeout_syn_sent,
 617                 .maxlen         = sizeof(unsigned int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec_jiffies,
 620         },
 621         {
 622                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 623                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 624                 .data           = &ip_ct_tcp_timeout_syn_recv,
 625                 .maxlen         = sizeof(unsigned int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec_jiffies,
 628         },
 629         {
 630                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 631                 .procname       = "ip_conntrack_tcp_timeout_established",
 632                 .data           = &ip_ct_tcp_timeout_established,
 633                 .maxlen         = sizeof(unsigned int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec_jiffies,
 636         },
 637         {
 638                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 639                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 640                 .data           = &ip_ct_tcp_timeout_fin_wait,
 641                 .maxlen         = sizeof(unsigned int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_dointvec_jiffies,
 644         },
 645         {
 646                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 647                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 648                 .data           = &ip_ct_tcp_timeout_close_wait,
 649                 .maxlen         = sizeof(unsigned int),
 650                 .mode           = 0644,
 651                 .proc_handler   = &proc_dointvec_jiffies,
 652         },
 653         {
 654                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 655                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 656                 .data           = &ip_ct_tcp_timeout_last_ack,
 657                 .maxlen         = sizeof(unsigned int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec_jiffies,
 660         },
 661         {
 662                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 663                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 664                 .data           = &ip_ct_tcp_timeout_time_wait,
 665                 .maxlen         = sizeof(unsigned int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec_jiffies,
 668         },
 669         {
 670                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 671                 .procname       = "ip_conntrack_tcp_timeout_close",
 672                 .data           = &ip_ct_tcp_timeout_close,
 673                 .maxlen         = sizeof(unsigned int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec_jiffies,
 676         },
 677         {
 678                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 679                 .procname       = "ip_conntrack_udp_timeout",
 680                 .data           = &ip_ct_udp_timeout,
 681                 .maxlen         = sizeof(unsigned int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec_jiffies,
 684         },
 685         {
 686                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 687                 .procname       = "ip_conntrack_udp_timeout_stream",
 688                 .data           = &ip_ct_udp_timeout_stream,
 689                 .maxlen         = sizeof(unsigned int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec_jiffies,
 692         },
 693         {
 694                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 695                 .procname       = "ip_conntrack_icmp_timeout",
 696                 .data           = &ip_ct_icmp_timeout,
 697                 .maxlen         = sizeof(unsigned int),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_dointvec_jiffies,
 700         },
 701         {
 702                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 703                 .procname       = "ip_conntrack_generic_timeout",
 704                 .data           = &ip_ct_generic_timeout,
 705                 .maxlen         = sizeof(unsigned int),
 706                 .mode           = 0644,
 707                 .proc_handler   = &proc_dointvec_jiffies,
 708         },
 709         {
 710                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 711                 .procname       = "ip_conntrack_log_invalid",
 712                 .data           = &ip_ct_log_invalid,
 713                 .maxlen         = sizeof(unsigned int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec_minmax,
 716                 .strategy       = &sysctl_intvec,
 717                 .extra1         = &log_invalid_proto_min,
 718                 .extra2         = &log_invalid_proto_max,
 719         },
 720         {
 721                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 722                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 723                 .data           = &ip_ct_tcp_timeout_max_retrans,
 724                 .maxlen         = sizeof(unsigned int),
 725                 .mode           = 0644,
 726                 .proc_handler   = &proc_dointvec_jiffies,
 727         },
 728         {
 729                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 730                 .procname       = "ip_conntrack_tcp_loose",
 731                 .data           = &ip_ct_tcp_loose,
 732                 .maxlen         = sizeof(unsigned int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec,
 735         },
 736         {
 737                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 738                 .procname       = "ip_conntrack_tcp_be_liberal",
 739                 .data           = &ip_ct_tcp_be_liberal,
 740                 .maxlen         = sizeof(unsigned int),
 741                 .mode           = 0644,
 742                 .proc_handler   = &proc_dointvec,
 743         },
 744         {
 745                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 746                 .procname       = "ip_conntrack_tcp_max_retrans",
 747                 .data           = &ip_ct_tcp_max_retrans,
 748                 .maxlen         = sizeof(unsigned int),
 749                 .mode           = 0644,
 750                 .proc_handler   = &proc_dointvec,
 751         },
 752         { .ctl_name = 0 }
 753 };
 754
 755 #define NET_IP_CONNTRACK_MAX 2089
 756
 757 static ctl_table ip_ct_netfilter_table[] = {
 758         {
 759                 .ctl_name       = NET_IPV4_NETFILTER,
 760                 .procname       = "netfilter",
 761                 .mode           = 0555,
 762                 .child          = ip_ct_sysctl_table,
 763         },
 764         {
 765                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 766                 .procname       = "ip_conntrack_max",
 767                 .data           = &ip_conntrack_max,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = &proc_dointvec
 771         },
 772         { .ctl_name = 0 }
 773 };
 774
 775 static ctl_table ip_ct_ipv4_table[] = {
 776         {
 777                 .ctl_name       = NET_IPV4,
 778                 .procname       = "ipv4",
 779                 .mode           = 0555,
 780                 .child          = ip_ct_netfilter_table,
 781         },
 782         { .ctl_name = 0 }
 783 };
 784
 785 static ctl_table ip_ct_net_table[] = {
 786         {
 787                 .ctl_name       = CTL_NET,
 788                 .procname       = "net",
 789                 .mode           = 0555,
 790                 .child          = ip_ct_ipv4_table,
 791         },
 792         { .ctl_name = 0 }
 793 };
 794
 795 EXPORT_SYMBOL(ip_ct_log_invalid);
 796 #endif /* CONFIG_SYSCTL */
 797
 798 /* FIXME: Allow NULL functions and sub in pointers to generic for
 799    them. --RR */
 800 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 801 {
 802         int ret = 0;
 803
 804         write_lock_bh(&ip_conntrack_lock);
 805         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 806                 ret = -EBUSY;
 807                 goto out;
 808         }
 809         ip_ct_protos[proto->proto] = proto;
 810  out:
 811         write_unlock_bh(&ip_conntrack_lock);
 812         return ret;
 813 }
 814
 815 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 816 {
 817         write_lock_bh(&ip_conntrack_lock);
 818         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 819         write_unlock_bh(&ip_conntrack_lock);
 820
 821         /* Somebody could be still looking at the proto in bh. */
 822         synchronize_net();
 823
 824         /* Remove all contrack entries for this protocol */
 825         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 826 }
 827
 828 static int __init ip_conntrack_standalone_init(void)
 829 {
 830 #ifdef CONFIG_PROC_FS
 831         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 832 #endif
 833         int ret = 0;
 834
 835         ret = ip_conntrack_init();
 836         if (ret < 0)
 837                 return ret;
 838
 839 #ifdef CONFIG_PROC_FS
 840         ret = -ENOMEM;
 841         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 842         if (!proc) goto cleanup_init;
 843
 844         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 845                                         &exp_file_ops);
 846         if (!proc_exp) goto cleanup_proc;
 847
 848         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 849         if (!proc_stat)
 850                 goto cleanup_proc_exp;
 851
 852         proc_stat->proc_fops = &ct_cpu_seq_fops;
 853         proc_stat->owner = THIS_MODULE;
 854 #endif
 855
 856         ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 857         if (ret < 0) {
 858                 printk("ip_conntrack: can't register hooks.\n");
 859                 goto cleanup_proc_stat;
 860         }
 861 #ifdef CONFIG_SYSCTL
 862         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 863         if (ip_ct_sysctl_header == NULL) {
 864                 printk("ip_conntrack: can't register to sysctl.\n");
 865                 ret = -ENOMEM;
 866                 goto cleanup_hooks;
 867         }
 868 #endif
 869         return ret;
 870
 871 #ifdef CONFIG_SYSCTL
 872  cleanup_hooks:
 873         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 874 #endif
 875  cleanup_proc_stat:
 876 #ifdef CONFIG_PROC_FS
 877         remove_proc_entry("ip_conntrack", proc_net_stat);
 878  cleanup_proc_exp:
 879         proc_net_remove("ip_conntrack_expect");
 880  cleanup_proc:
 881         proc_net_remove("ip_conntrack");
 882  cleanup_init:
 883 #endif /* CONFIG_PROC_FS */
 884         ip_conntrack_cleanup();
 885         return ret;
 886 }
 887
 888 static void __exit ip_conntrack_standalone_fini(void)
 889 {
 890         synchronize_net();
 891 #ifdef CONFIG_SYSCTL
 892         unregister_sysctl_table(ip_ct_sysctl_header);
 893 #endif
 894         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 895 #ifdef CONFIG_PROC_FS
 896         remove_proc_entry("ip_conntrack", proc_net_stat);
 897         proc_net_remove("ip_conntrack_expect");
 898         proc_net_remove("ip_conntrack");
 899 #endif /* CONFIG_PROC_FS */
 900         ip_conntrack_cleanup();
 901 }
 902
 903 module_init(ip_conntrack_standalone_init);
 904 module_exit(ip_conntrack_standalone_fini);
 905
 906 /* Some modules need us, but don't depend directly on any symbol.
 907    They should call this. */
 908 void need_conntrack(void)
 909 {
 910 }
 911
 912 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 913 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 914 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 915 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 916 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 917 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 918 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 919 #endif
 920 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 921 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 922 EXPORT_SYMBOL(ip_ct_get_tuple);
 923 EXPORT_SYMBOL(invert_tuplepr);
 924 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 925 EXPORT_SYMBOL(ip_conntrack_destroyed);
 926 EXPORT_SYMBOL(need_conntrack);
 927 EXPORT_SYMBOL(ip_conntrack_helper_register);
 928 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 929 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 930 EXPORT_SYMBOL(__ip_ct_refresh_acct);
 931
 932 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 933 EXPORT_SYMBOL(ip_conntrack_expect_put);
 934 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
 935 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find);
 936 EXPORT_SYMBOL(ip_conntrack_expect_related);
 937 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 938 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 939 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 940
 941 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 942 EXPORT_SYMBOL(ip_ct_gather_frags);
 943 EXPORT_SYMBOL(ip_conntrack_htable_size);
 944 EXPORT_SYMBOL(ip_conntrack_lock);
 945 EXPORT_SYMBOL(ip_conntrack_hash);
 946 EXPORT_SYMBOL(ip_conntrack_untracked);
 947 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
 948 #ifdef CONFIG_IP_NF_NAT_NEEDED
 949 EXPORT_SYMBOL(ip_conntrack_tcp_update);
 950 #endif
 951
 952 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
 953 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
 954
 955 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
 956 EXPORT_SYMBOL_GPL(ip_conntrack_free);
 957 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
 958
 959 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
 960
 961 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
 962 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
 963 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 964
 965 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
 966 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
 967 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
 968 EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
 969 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 970     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 971 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
 972 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
 973 #endif