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