net/netfilter/nf_conntrack_standalone.c

   1 /* This file contains all the functions required for the standalone
   2    nf_conntrack module.
   3
   4    These are not required by the compatibility layer.
   5 */
   6
   7 /* (C) 1999-2001 Paul `Rusty' Russell
   8  * (C) 2002-2004 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  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  15  *      - generalize L3 protocol dependent part.
  16  *
  17  * Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
  18  */
  19
  20 #include <linux/config.h>
  21 #include <linux/types.h>
  22 #include <linux/netfilter.h>
  23 #include <linux/module.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/percpu.h>
  28 #include <linux/netdevice.h>
  29 #ifdef CONFIG_SYSCTL
  30 #include <linux/sysctl.h>
  31 #endif
  32
  33 #define ASSERT_READ_LOCK(x)
  34 #define ASSERT_WRITE_LOCK(x)
  35
  36 #include <net/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_l3proto.h>
  38 #include <net/netfilter/nf_conntrack_protocol.h>
  39 #include <net/netfilter/nf_conntrack_core.h>
  40 #include <net/netfilter/nf_conntrack_helper.h>
  41 #include <linux/netfilter_ipv4/listhelp.h>
  42
  43 #if 0
  44 #define DEBUGP printk
  45 #else
  46 #define DEBUGP(format, args...)
  47 #endif
  48
  49 MODULE_LICENSE("GPL");
  50
  51 extern atomic_t nf_conntrack_count;
  52 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
  53
  54 static int kill_l3proto(struct nf_conn *i, void *data)
  55 {
  56         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  57                         ((struct nf_conntrack_l3proto *)data)->l3proto);
  58 }
  59
  60 static int kill_proto(struct nf_conn *i, void *data)
  61 {
  62         struct nf_conntrack_protocol *proto;
  63         proto = (struct nf_conntrack_protocol *)data;
  64         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  65                         proto->proto) &&
  66                (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  67                         proto->l3proto);
  68 }
  69
  70 #ifdef CONFIG_PROC_FS
  71 static int
  72 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  73             struct nf_conntrack_l3proto *l3proto,
  74             struct nf_conntrack_protocol *proto)
  75 {
  76         return l3proto->print_tuple(s, tuple) || proto->print_tuple(s, tuple);
  77 }
  78
  79 #ifdef CONFIG_NF_CT_ACCT
  80 static unsigned int
  81 seq_print_counters(struct seq_file *s,
  82                    const struct ip_conntrack_counter *counter)
  83 {
  84         return seq_printf(s, "packets=%llu bytes=%llu ",
  85                           (unsigned long long)counter->packets,
  86                           (unsigned long long)counter->bytes);
  87 }
  88 #else
  89 #define seq_print_counters(x, y)        0
  90 #endif
  91
  92 struct ct_iter_state {
  93         unsigned int bucket;
  94 };
  95
  96 static struct list_head *ct_get_first(struct seq_file *seq)
  97 {
  98         struct ct_iter_state *st = seq->private;
  99
 100         for (st->bucket = 0;
 101              st->bucket < nf_conntrack_htable_size;
 102              st->bucket++) {
 103                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
 104                         return nf_conntrack_hash[st->bucket].next;
 105         }
 106         return NULL;
 107 }
 108
 109 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
 110 {
 111         struct ct_iter_state *st = seq->private;
 112
 113         head = head->next;
 114         while (head == &nf_conntrack_hash[st->bucket]) {
 115                 if (++st->bucket >= nf_conntrack_htable_size)
 116                         return NULL;
 117                 head = nf_conntrack_hash[st->bucket].next;
 118         }
 119         return head;
 120 }
 121
 122 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 123 {
 124         struct list_head *head = ct_get_first(seq);
 125
 126         if (head)
 127                 while (pos && (head = ct_get_next(seq, head)))
 128                         pos--;
 129         return pos ? NULL : head;
 130 }
 131
 132 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 133 {
 134         read_lock_bh(&nf_conntrack_lock);
 135         return ct_get_idx(seq, *pos);
 136 }
 137
 138 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 139 {
 140         (*pos)++;
 141         return ct_get_next(s, v);
 142 }
 143
 144 static void ct_seq_stop(struct seq_file *s, void *v)
 145 {
 146         read_unlock_bh(&nf_conntrack_lock);
 147 }
 148
 149 /* return 0 on success, 1 in case of error */
 150 static int ct_seq_show(struct seq_file *s, void *v)
 151 {
 152         const struct nf_conntrack_tuple_hash *hash = v;
 153         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 154         struct nf_conntrack_l3proto *l3proto;
 155         struct nf_conntrack_protocol *proto;
 156
 157         ASSERT_READ_LOCK(&nf_conntrack_lock);
 158         NF_CT_ASSERT(conntrack);
 159
 160         /* we only want to print DIR_ORIGINAL */
 161         if (NF_CT_DIRECTION(hash))
 162                 return 0;
 163
 164         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 165                                        .tuple.src.l3num);
 166
 167         NF_CT_ASSERT(l3proto);
 168         proto = __nf_ct_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 169                                    .tuple.src.l3num,
 170                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 171                                    .tuple.dst.protonum);
 172         NF_CT_ASSERT(proto);
 173
 174         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 175                        l3proto->name,
 176                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 177                        proto->name,
 178                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 179                        timer_pending(&conntrack->timeout)
 180                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 181                 return -ENOSPC;
 182
 183         if (l3proto->print_conntrack(s, conntrack))
 184                 return -ENOSPC;
 185
 186         if (proto->print_conntrack(s, conntrack))
 187                 return -ENOSPC;
 188
 189         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 190                         l3proto, proto))
 191                 return -ENOSPC;
 192
 193         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 194                 return -ENOSPC;
 195
 196         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 197                 if (seq_printf(s, "[UNREPLIED] "))
 198                         return -ENOSPC;
 199
 200         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 201                         l3proto, proto))
 202                 return -ENOSPC;
 203
 204         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 205                 return -ENOSPC;
 206
 207         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 208                 if (seq_printf(s, "[ASSURED] "))
 209                         return -ENOSPC;
 210
 211 #if defined(CONFIG_NF_CONNTRACK_MARK)
 212         if (seq_printf(s, "mark=%u ", conntrack->mark))
 213                 return -ENOSPC;
 214 #endif
 215
 216         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 217                 return -ENOSPC;
 218
 219         return 0;
 220 }
 221
 222 static struct seq_operations ct_seq_ops = {
 223         .start = ct_seq_start,
 224         .next  = ct_seq_next,
 225         .stop  = ct_seq_stop,
 226         .show  = ct_seq_show
 227 };
 228
 229 static int ct_open(struct inode *inode, struct file *file)
 230 {
 231         struct seq_file *seq;
 232         struct ct_iter_state *st;
 233         int ret;
 234
 235         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 236         if (st == NULL)
 237                 return -ENOMEM;
 238         ret = seq_open(file, &ct_seq_ops);
 239         if (ret)
 240                 goto out_free;
 241         seq          = file->private_data;
 242         seq->private = st;
 243         memset(st, 0, sizeof(struct ct_iter_state));
 244         return ret;
 245 out_free:
 246         kfree(st);
 247         return ret;
 248 }
 249
 250 static struct file_operations ct_file_ops = {
 251         .owner   = THIS_MODULE,
 252         .open    = ct_open,
 253         .read    = seq_read,
 254         .llseek  = seq_lseek,
 255         .release = seq_release_private,
 256 };
 257
 258 /* expects */
 259 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 260 {
 261         struct list_head *e = &nf_conntrack_expect_list;
 262         loff_t i;
 263
 264         /* strange seq_file api calls stop even if we fail,
 265          * thus we need to grab lock since stop unlocks */
 266         read_lock_bh(&nf_conntrack_lock);
 267
 268         if (list_empty(e))
 269                 return NULL;
 270
 271         for (i = 0; i <= *pos; i++) {
 272                 e = e->next;
 273                 if (e == &nf_conntrack_expect_list)
 274                         return NULL;
 275         }
 276         return e;
 277 }
 278
 279 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 280 {
 281         struct list_head *e = v;
 282
 283         ++*pos;
 284         e = e->next;
 285
 286         if (e == &nf_conntrack_expect_list)
 287                 return NULL;
 288
 289         return e;
 290 }
 291
 292 static void exp_seq_stop(struct seq_file *s, void *v)
 293 {
 294         read_unlock_bh(&nf_conntrack_lock);
 295 }
 296
 297 static int exp_seq_show(struct seq_file *s, void *v)
 298 {
 299         struct nf_conntrack_expect *expect = v;
 300
 301         if (expect->timeout.function)
 302                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 303                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 304         else
 305                 seq_printf(s, "- ");
 306         seq_printf(s, "l3proto = %u proto=%u ",
 307                    expect->tuple.src.l3num,
 308                    expect->tuple.dst.protonum);
 309         print_tuple(s, &expect->tuple,
 310                     __nf_ct_l3proto_find(expect->tuple.src.l3num),
 311                     __nf_ct_proto_find(expect->tuple.src.l3num,
 312                                        expect->tuple.dst.protonum));
 313         return seq_putc(s, '\n');
 314 }
 315
 316 static struct seq_operations exp_seq_ops = {
 317         .start = exp_seq_start,
 318         .next = exp_seq_next,
 319         .stop = exp_seq_stop,
 320         .show = exp_seq_show
 321 };
 322
 323 static int exp_open(struct inode *inode, struct file *file)
 324 {
 325         return seq_open(file, &exp_seq_ops);
 326 }
 327
 328 static struct file_operations exp_file_ops = {
 329         .owner   = THIS_MODULE,
 330         .open    = exp_open,
 331         .read    = seq_read,
 332         .llseek  = seq_lseek,
 333         .release = seq_release
 334 };
 335
 336 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 337 {
 338         int cpu;
 339
 340         if (*pos == 0)
 341                 return SEQ_START_TOKEN;
 342
 343         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 344                 if (!cpu_possible(cpu))
 345                         continue;
 346                 *pos = cpu + 1;
 347                 return &per_cpu(nf_conntrack_stat, cpu);
 348         }
 349
 350         return NULL;
 351 }
 352
 353 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 354 {
 355         int cpu;
 356
 357         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 358                 if (!cpu_possible(cpu))
 359                         continue;
 360                 *pos = cpu + 1;
 361                 return &per_cpu(nf_conntrack_stat, cpu);
 362         }
 363
 364         return NULL;
 365 }
 366
 367 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 368 {
 369 }
 370
 371 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 372 {
 373         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 374         struct ip_conntrack_stat *st = v;
 375
 376         if (v == SEQ_START_TOKEN) {
 377                 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");
 378                 return 0;
 379         }
 380
 381         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 382                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 383                    nr_conntracks,
 384                    st->searched,
 385                    st->found,
 386                    st->new,
 387                    st->invalid,
 388                    st->ignore,
 389                    st->delete,
 390                    st->delete_list,
 391                    st->insert,
 392                    st->insert_failed,
 393                    st->drop,
 394                    st->early_drop,
 395                    st->error,
 396
 397                    st->expect_new,
 398                    st->expect_create,
 399                    st->expect_delete
 400                 );
 401         return 0;
 402 }
 403
 404 static struct seq_operations ct_cpu_seq_ops = {
 405         .start  = ct_cpu_seq_start,
 406         .next   = ct_cpu_seq_next,
 407         .stop   = ct_cpu_seq_stop,
 408         .show   = ct_cpu_seq_show,
 409 };
 410
 411 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 412 {
 413         return seq_open(file, &ct_cpu_seq_ops);
 414 }
 415
 416 static struct file_operations ct_cpu_seq_fops = {
 417         .owner   = THIS_MODULE,
 418         .open    = ct_cpu_seq_open,
 419         .read    = seq_read,
 420         .llseek  = seq_lseek,
 421         .release = seq_release_private,
 422 };
 423 #endif /* CONFIG_PROC_FS */
 424
 425 /* Sysctl support */
 426
 427 #ifdef CONFIG_SYSCTL
 428
 429 /* From nf_conntrack_core.c */
 430 extern int nf_conntrack_max;
 431 extern unsigned int nf_conntrack_htable_size;
 432
 433 /* From nf_conntrack_proto_tcp.c */
 434 extern unsigned int nf_ct_tcp_timeout_syn_sent;
 435 extern unsigned int nf_ct_tcp_timeout_syn_recv;
 436 extern unsigned int nf_ct_tcp_timeout_established;
 437 extern unsigned int nf_ct_tcp_timeout_fin_wait;
 438 extern unsigned int nf_ct_tcp_timeout_close_wait;
 439 extern unsigned int nf_ct_tcp_timeout_last_ack;
 440 extern unsigned int nf_ct_tcp_timeout_time_wait;
 441 extern unsigned int nf_ct_tcp_timeout_close;
 442 extern unsigned int nf_ct_tcp_timeout_max_retrans;
 443 extern int nf_ct_tcp_loose;
 444 extern int nf_ct_tcp_be_liberal;
 445 extern int nf_ct_tcp_max_retrans;
 446
 447 /* From nf_conntrack_proto_udp.c */
 448 extern unsigned int nf_ct_udp_timeout;
 449 extern unsigned int nf_ct_udp_timeout_stream;
 450
 451 /* From nf_conntrack_proto_generic.c */
 452 extern unsigned int nf_ct_generic_timeout;
 453
 454 /* Log invalid packets of a given protocol */
 455 static int log_invalid_proto_min = 0;
 456 static int log_invalid_proto_max = 255;
 457
 458 static struct ctl_table_header *nf_ct_sysctl_header;
 459
 460 static ctl_table nf_ct_sysctl_table[] = {
 461         {
 462                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 463                 .procname       = "nf_conntrack_max",
 464                 .data           = &nf_conntrack_max,
 465                 .maxlen         = sizeof(int),
 466                 .mode           = 0644,
 467                 .proc_handler   = &proc_dointvec,
 468         },
 469         {
 470                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 471                 .procname       = "nf_conntrack_count",
 472                 .data           = &nf_conntrack_count,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0444,
 475                 .proc_handler   = &proc_dointvec,
 476         },
 477         {
 478                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 479                 .procname       = "nf_conntrack_buckets",
 480                 .data           = &nf_conntrack_htable_size,
 481                 .maxlen         = sizeof(unsigned int),
 482                 .mode           = 0444,
 483                 .proc_handler   = &proc_dointvec,
 484         },
 485         {
 486                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 487                 .procname       = "nf_conntrack_tcp_timeout_syn_sent",
 488                 .data           = &nf_ct_tcp_timeout_syn_sent,
 489                 .maxlen         = sizeof(unsigned int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec_jiffies,
 492         },
 493         {
 494                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 495                 .procname       = "nf_conntrack_tcp_timeout_syn_recv",
 496                 .data           = &nf_ct_tcp_timeout_syn_recv,
 497                 .maxlen         = sizeof(unsigned int),
 498                 .mode           = 0644,
 499                 .proc_handler   = &proc_dointvec_jiffies,
 500         },
 501         {
 502                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 503                 .procname       = "nf_conntrack_tcp_timeout_established",
 504                 .data           = &nf_ct_tcp_timeout_established,
 505                 .maxlen         = sizeof(unsigned int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec_jiffies,
 508         },
 509         {
 510                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 511                 .procname       = "nf_conntrack_tcp_timeout_fin_wait",
 512                 .data           = &nf_ct_tcp_timeout_fin_wait,
 513                 .maxlen         = sizeof(unsigned int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec_jiffies,
 516         },
 517         {
 518                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 519                 .procname       = "nf_conntrack_tcp_timeout_close_wait",
 520                 .data           = &nf_ct_tcp_timeout_close_wait,
 521                 .maxlen         = sizeof(unsigned int),
 522                 .mode           = 0644,
 523                 .proc_handler   = &proc_dointvec_jiffies,
 524         },
 525         {
 526                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 527                 .procname       = "nf_conntrack_tcp_timeout_last_ack",
 528                 .data           = &nf_ct_tcp_timeout_last_ack,
 529                 .maxlen         = sizeof(unsigned int),
 530                 .mode           = 0644,
 531                 .proc_handler   = &proc_dointvec_jiffies,
 532         },
 533         {
 534                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 535                 .procname       = "nf_conntrack_tcp_timeout_time_wait",
 536                 .data           = &nf_ct_tcp_timeout_time_wait,
 537                 .maxlen         = sizeof(unsigned int),
 538                 .mode           = 0644,
 539                 .proc_handler   = &proc_dointvec_jiffies,
 540         },
 541         {
 542                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 543                 .procname       = "nf_conntrack_tcp_timeout_close",
 544                 .data           = &nf_ct_tcp_timeout_close,
 545                 .maxlen         = sizeof(unsigned int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec_jiffies,
 548         },
 549         {
 550                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT,
 551                 .procname       = "nf_conntrack_udp_timeout",
 552                 .data           = &nf_ct_udp_timeout,
 553                 .maxlen         = sizeof(unsigned int),
 554                 .mode           = 0644,
 555                 .proc_handler   = &proc_dointvec_jiffies,
 556         },
 557         {
 558                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 559                 .procname       = "nf_conntrack_udp_timeout_stream",
 560                 .data           = &nf_ct_udp_timeout_stream,
 561                 .maxlen         = sizeof(unsigned int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec_jiffies,
 564         },
 565         {
 566                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
 567                 .procname       = "nf_conntrack_generic_timeout",
 568                 .data           = &nf_ct_generic_timeout,
 569                 .maxlen         = sizeof(unsigned int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec_jiffies,
 572         },
 573         {
 574                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 575                 .procname       = "nf_conntrack_log_invalid",
 576                 .data           = &nf_ct_log_invalid,
 577                 .maxlen         = sizeof(unsigned int),
 578                 .mode           = 0644,
 579                 .proc_handler   = &proc_dointvec_minmax,
 580                 .strategy       = &sysctl_intvec,
 581                 .extra1         = &log_invalid_proto_min,
 582                 .extra2         = &log_invalid_proto_max,
 583         },
 584         {
 585                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 586                 .procname       = "nf_conntrack_tcp_timeout_max_retrans",
 587                 .data           = &nf_ct_tcp_timeout_max_retrans,
 588                 .maxlen         = sizeof(unsigned int),
 589                 .mode           = 0644,
 590                 .proc_handler   = &proc_dointvec_jiffies,
 591         },
 592         {
 593                 .ctl_name       = NET_NF_CONNTRACK_TCP_LOOSE,
 594                 .procname       = "nf_conntrack_tcp_loose",
 595                 .data           = &nf_ct_tcp_loose,
 596                 .maxlen         = sizeof(unsigned int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec,
 599         },
 600         {
 601                 .ctl_name       = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
 602                 .procname       = "nf_conntrack_tcp_be_liberal",
 603                 .data           = &nf_ct_tcp_be_liberal,
 604                 .maxlen         = sizeof(unsigned int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608         {
 609                 .ctl_name       = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
 610                 .procname       = "nf_conntrack_tcp_max_retrans",
 611                 .data           = &nf_ct_tcp_max_retrans,
 612                 .maxlen         = sizeof(unsigned int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec,
 615         },
 616
 617         { .ctl_name = 0 }
 618 };
 619
 620 #define NET_NF_CONNTRACK_MAX 2089
 621
 622 static ctl_table nf_ct_netfilter_table[] = {
 623         {
 624                 .ctl_name       = NET_NETFILTER,
 625                 .procname       = "netfilter",
 626                 .mode           = 0555,
 627                 .child          = nf_ct_sysctl_table,
 628         },
 629         {
 630                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 631                 .procname       = "nf_conntrack_max",
 632                 .data           = &nf_conntrack_max,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec,
 636         },
 637         { .ctl_name = 0 }
 638 };
 639
 640 static ctl_table nf_ct_net_table[] = {
 641         {
 642                 .ctl_name       = CTL_NET,
 643                 .procname       = "net",
 644                 .mode           = 0555,
 645                 .child          = nf_ct_netfilter_table,
 646         },
 647         { .ctl_name = 0 }
 648 };
 649 EXPORT_SYMBOL(nf_ct_log_invalid);
 650 #endif /* CONFIG_SYSCTL */
 651
 652 static int init_or_cleanup(int init)
 653 {
 654 #ifdef CONFIG_PROC_FS
 655         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 656 #endif
 657         int ret = 0;
 658
 659         if (!init) goto cleanup;
 660
 661         ret = nf_conntrack_init();
 662         if (ret < 0)
 663                 goto cleanup_nothing;
 664
 665 #ifdef CONFIG_PROC_FS
 666         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 667         if (!proc) goto cleanup_init;
 668
 669         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 670                                         &exp_file_ops);
 671         if (!proc_exp) goto cleanup_proc;
 672
 673         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 674         if (!proc_stat)
 675                 goto cleanup_proc_exp;
 676
 677         proc_stat->proc_fops = &ct_cpu_seq_fops;
 678         proc_stat->owner = THIS_MODULE;
 679 #endif
 680 #ifdef CONFIG_SYSCTL
 681         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 682         if (nf_ct_sysctl_header == NULL) {
 683                 printk("nf_conntrack: can't register to sysctl.\n");
 684                 ret = -ENOMEM;
 685                 goto cleanup_proc_stat;
 686         }
 687 #endif
 688
 689         return ret;
 690
 691  cleanup:
 692 #ifdef CONFIG_SYSCTL
 693         unregister_sysctl_table(nf_ct_sysctl_header);
 694  cleanup_proc_stat:
 695 #endif
 696 #ifdef CONFIG_PROC_FS
 697         remove_proc_entry("nf_conntrack", proc_net_stat);
 698  cleanup_proc_exp:
 699         proc_net_remove("nf_conntrack_expect");
 700  cleanup_proc:
 701         proc_net_remove("nf_conntrack");
 702  cleanup_init:
 703 #endif /* CNFIG_PROC_FS */
 704         nf_conntrack_cleanup();
 705  cleanup_nothing:
 706         return ret;
 707 }
 708
 709 int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
 710 {
 711         int ret = 0;
 712
 713         write_lock_bh(&nf_conntrack_lock);
 714         if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
 715                 ret = -EBUSY;
 716                 goto out;
 717         }
 718         nf_ct_l3protos[proto->l3proto] = proto;
 719 out:
 720         write_unlock_bh(&nf_conntrack_lock);
 721
 722         return ret;
 723 }
 724
 725 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 726 {
 727         write_lock_bh(&nf_conntrack_lock);
 728         nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
 729         write_unlock_bh(&nf_conntrack_lock);
 730
 731         /* Somebody could be still looking at the proto in bh. */
 732         synchronize_net();
 733
 734         /* Remove all contrack entries for this protocol */
 735         nf_ct_iterate_cleanup(kill_l3proto, proto);
 736 }
 737
 738 /* FIXME: Allow NULL functions and sub in pointers to generic for
 739    them. --RR */
 740 int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
 741 {
 742         int ret = 0;
 743
 744 retry:
 745         write_lock_bh(&nf_conntrack_lock);
 746         if (nf_ct_protos[proto->l3proto]) {
 747                 if (nf_ct_protos[proto->l3proto][proto->proto]
 748                                 != &nf_conntrack_generic_protocol) {
 749                         ret = -EBUSY;
 750                         goto out_unlock;
 751                 }
 752         } else {
 753                 /* l3proto may be loaded latter. */
 754                 struct nf_conntrack_protocol **proto_array;
 755                 int i;
 756
 757                 write_unlock_bh(&nf_conntrack_lock);
 758
 759                 proto_array = (struct nf_conntrack_protocol **)
 760                                 kmalloc(MAX_NF_CT_PROTO *
 761                                          sizeof(struct nf_conntrack_protocol *),
 762                                         GFP_KERNEL);
 763                 if (proto_array == NULL) {
 764                         ret = -ENOMEM;
 765                         goto out;
 766                 }
 767                 for (i = 0; i < MAX_NF_CT_PROTO; i++)
 768                         proto_array[i] = &nf_conntrack_generic_protocol;
 769
 770                 write_lock_bh(&nf_conntrack_lock);
 771                 if (nf_ct_protos[proto->l3proto]) {
 772                         /* bad timing, but no problem */
 773                         write_unlock_bh(&nf_conntrack_lock);
 774                         kfree(proto_array);
 775                 } else {
 776                         nf_ct_protos[proto->l3proto] = proto_array;
 777                         write_unlock_bh(&nf_conntrack_lock);
 778                 }
 779
 780                 /*
 781                  * Just once because array is never freed until unloading
 782                  * nf_conntrack.ko
 783                  */
 784                 goto retry;
 785         }
 786
 787         nf_ct_protos[proto->l3proto][proto->proto] = proto;
 788
 789 out_unlock:
 790         write_unlock_bh(&nf_conntrack_lock);
 791 out:
 792         return ret;
 793 }
 794
 795 void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
 796 {
 797         write_lock_bh(&nf_conntrack_lock);
 798         nf_ct_protos[proto->l3proto][proto->proto]
 799                 = &nf_conntrack_generic_protocol;
 800         write_unlock_bh(&nf_conntrack_lock);
 801
 802         /* Somebody could be still looking at the proto in bh. */
 803         synchronize_net();
 804
 805         /* Remove all contrack entries for this protocol */
 806         nf_ct_iterate_cleanup(kill_proto, proto);
 807 }
 808
 809 static int __init init(void)
 810 {
 811         return init_or_cleanup(1);
 812 }
 813
 814 static void __exit fini(void)
 815 {
 816         init_or_cleanup(0);
 817 }
 818
 819 module_init(init);
 820 module_exit(fini);
 821
 822 /* Some modules need us, but don't depend directly on any symbol.
 823    They should call this. */
 824 void need_conntrack(void)
 825 {
 826 }
 827
 828 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 829 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 830 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 831 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 832 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 833 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 834 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 835 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 836 #endif
 837 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 838 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 839 EXPORT_SYMBOL(nf_conntrack_protocol_register);
 840 EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
 841 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 842 EXPORT_SYMBOL(nf_conntrack_destroyed);
 843 EXPORT_SYMBOL(need_conntrack);
 844 EXPORT_SYMBOL(nf_conntrack_helper_register);
 845 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 846 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 847 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 848 EXPORT_SYMBOL(nf_ct_protos);
 849 EXPORT_SYMBOL(__nf_ct_proto_find);
 850 EXPORT_SYMBOL(nf_ct_proto_find_get);
 851 EXPORT_SYMBOL(nf_ct_proto_put);
 852 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 853 EXPORT_SYMBOL(nf_ct_l3proto_put);
 854 EXPORT_SYMBOL(nf_ct_l3protos);
 855 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 856 EXPORT_SYMBOL(nf_conntrack_expect_put);
 857 EXPORT_SYMBOL(nf_conntrack_expect_related);
 858 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 859 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 860 EXPORT_SYMBOL(nf_conntrack_htable_size);
 861 EXPORT_SYMBOL(nf_conntrack_lock);
 862 EXPORT_SYMBOL(nf_conntrack_hash);
 863 EXPORT_SYMBOL(nf_conntrack_untracked);
 864 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 865 #ifdef CONFIG_IP_NF_NAT_NEEDED
 866 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 867 #endif
 868 EXPORT_SYMBOL(__nf_conntrack_confirm);
 869 EXPORT_SYMBOL(nf_ct_get_tuple);
 870 EXPORT_SYMBOL(nf_ct_invert_tuple);
 871 EXPORT_SYMBOL(nf_conntrack_in);
 872 EXPORT_SYMBOL(__nf_conntrack_attach);
 873 EXPORT_SYMBOL(nf_conntrack_alloc);
 874 EXPORT_SYMBOL(nf_conntrack_free);
 875 EXPORT_SYMBOL(nf_conntrack_flush);
 876 EXPORT_SYMBOL(nf_ct_remove_expectations);
 877 EXPORT_SYMBOL(nf_ct_helper_find_get);
 878 EXPORT_SYMBOL(nf_ct_helper_put);
 879 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 880 EXPORT_SYMBOL(__nf_conntrack_find);
 881 EXPORT_SYMBOL(nf_ct_unlink_expect);
 882 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 883 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 884 EXPORT_SYMBOL(nf_conntrack_expect_find);
 885 EXPORT_SYMBOL(nf_conntrack_expect_list);
 886 #if defined(CONFIG_NF_CT_NETLINK) || \
 887     defined(CONFIG_NF_CT_NETLINK_MODULE)
 888 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 889 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 890 #endif