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   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/types.h>
  21 #include <linux/netfilter.h>
  22 #include <linux/module.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/percpu.h>
  27 #include <linux/netdevice.h>
  28 #ifdef CONFIG_SYSCTL
  29 #include <linux/sysctl.h>
  30 #endif
  31
  32 #define ASSERT_READ_LOCK(x)
  33 #define ASSERT_WRITE_LOCK(x)
  34
  35 #include <net/netfilter/nf_conntrack.h>
  36 #include <net/netfilter/nf_conntrack_l3proto.h>
  37 #include <net/netfilter/nf_conntrack_protocol.h>
  38 #include <net/netfilter/nf_conntrack_core.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40
  41 #if 0
  42 #define DEBUGP printk
  43 #else
  44 #define DEBUGP(format, args...)
  45 #endif
  46
  47 MODULE_LICENSE("GPL");
  48
  49 extern atomic_t nf_conntrack_count;
  50 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
  51
  52 static int kill_l3proto(struct nf_conn *i, void *data)
  53 {
  54         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  55                         ((struct nf_conntrack_l3proto *)data)->l3proto);
  56 }
  57
  58 static int kill_proto(struct nf_conn *i, void *data)
  59 {
  60         struct nf_conntrack_protocol *proto;
  61         proto = (struct nf_conntrack_protocol *)data;
  62         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  63                         proto->proto) &&
  64                (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  65                         proto->l3proto);
  66 }
  67
  68 #ifdef CONFIG_PROC_FS
  69 static int
  70 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  71             struct nf_conntrack_l3proto *l3proto,
  72             struct nf_conntrack_protocol *proto)
  73 {
  74         return l3proto->print_tuple(s, tuple) || proto->print_tuple(s, tuple);
  75 }
  76
  77 #ifdef CONFIG_NF_CT_ACCT
  78 static unsigned int
  79 seq_print_counters(struct seq_file *s,
  80                    const struct ip_conntrack_counter *counter)
  81 {
  82         return seq_printf(s, "packets=%llu bytes=%llu ",
  83                           (unsigned long long)counter->packets,
  84                           (unsigned long long)counter->bytes);
  85 }
  86 #else
  87 #define seq_print_counters(x, y)        0
  88 #endif
  89
  90 struct ct_iter_state {
  91         unsigned int bucket;
  92 };
  93
  94 static struct list_head *ct_get_first(struct seq_file *seq)
  95 {
  96         struct ct_iter_state *st = seq->private;
  97
  98         for (st->bucket = 0;
  99              st->bucket < nf_conntrack_htable_size;
 100              st->bucket++) {
 101                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
 102                         return nf_conntrack_hash[st->bucket].next;
 103         }
 104         return NULL;
 105 }
 106
 107 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
 108 {
 109         struct ct_iter_state *st = seq->private;
 110
 111         head = head->next;
 112         while (head == &nf_conntrack_hash[st->bucket]) {
 113                 if (++st->bucket >= nf_conntrack_htable_size)
 114                         return NULL;
 115                 head = nf_conntrack_hash[st->bucket].next;
 116         }
 117         return head;
 118 }
 119
 120 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 121 {
 122         struct list_head *head = ct_get_first(seq);
 123
 124         if (head)
 125                 while (pos && (head = ct_get_next(seq, head)))
 126                         pos--;
 127         return pos ? NULL : head;
 128 }
 129
 130 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 131 {
 132         read_lock_bh(&nf_conntrack_lock);
 133         return ct_get_idx(seq, *pos);
 134 }
 135
 136 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 137 {
 138         (*pos)++;
 139         return ct_get_next(s, v);
 140 }
 141
 142 static void ct_seq_stop(struct seq_file *s, void *v)
 143 {
 144         read_unlock_bh(&nf_conntrack_lock);
 145 }
 146
 147 /* return 0 on success, 1 in case of error */
 148 static int ct_seq_show(struct seq_file *s, void *v)
 149 {
 150         const struct nf_conntrack_tuple_hash *hash = v;
 151         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 152         struct nf_conntrack_l3proto *l3proto;
 153         struct nf_conntrack_protocol *proto;
 154
 155         ASSERT_READ_LOCK(&nf_conntrack_lock);
 156         NF_CT_ASSERT(conntrack);
 157
 158         /* we only want to print DIR_ORIGINAL */
 159         if (NF_CT_DIRECTION(hash))
 160                 return 0;
 161
 162         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 163                                        .tuple.src.l3num);
 164
 165         NF_CT_ASSERT(l3proto);
 166         proto = __nf_ct_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 167                                    .tuple.src.l3num,
 168                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 169                                    .tuple.dst.protonum);
 170         NF_CT_ASSERT(proto);
 171
 172         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 173                        l3proto->name,
 174                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 175                        proto->name,
 176                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 177                        timer_pending(&conntrack->timeout)
 178                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 179                 return -ENOSPC;
 180
 181         if (l3proto->print_conntrack(s, conntrack))
 182                 return -ENOSPC;
 183
 184         if (proto->print_conntrack(s, conntrack))
 185                 return -ENOSPC;
 186
 187         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 188                         l3proto, proto))
 189                 return -ENOSPC;
 190
 191         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 192                 return -ENOSPC;
 193
 194         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 195                 if (seq_printf(s, "[UNREPLIED] "))
 196                         return -ENOSPC;
 197
 198         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 199                         l3proto, proto))
 200                 return -ENOSPC;
 201
 202         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 203                 return -ENOSPC;
 204
 205         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 206                 if (seq_printf(s, "[ASSURED] "))
 207                         return -ENOSPC;
 208
 209 #if defined(CONFIG_NF_CONNTRACK_MARK)
 210         if (seq_printf(s, "mark=%u ", conntrack->mark))
 211                 return -ENOSPC;
 212 #endif
 213
 214 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 215         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 216                 return -ENOSPC;
 217 #endif
 218
 219         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 220                 return -ENOSPC;
 221
 222         return 0;
 223 }
 224
 225 static struct seq_operations ct_seq_ops = {
 226         .start = ct_seq_start,
 227         .next  = ct_seq_next,
 228         .stop  = ct_seq_stop,
 229         .show  = ct_seq_show
 230 };
 231
 232 static int ct_open(struct inode *inode, struct file *file)
 233 {
 234         struct seq_file *seq;
 235         struct ct_iter_state *st;
 236         int ret;
 237
 238         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 239         if (st == NULL)
 240                 return -ENOMEM;
 241         ret = seq_open(file, &ct_seq_ops);
 242         if (ret)
 243                 goto out_free;
 244         seq          = file->private_data;
 245         seq->private = st;
 246         memset(st, 0, sizeof(struct ct_iter_state));
 247         return ret;
 248 out_free:
 249         kfree(st);
 250         return ret;
 251 }
 252
 253 static struct file_operations ct_file_ops = {
 254         .owner   = THIS_MODULE,
 255         .open    = ct_open,
 256         .read    = seq_read,
 257         .llseek  = seq_lseek,
 258         .release = seq_release_private,
 259 };
 260
 261 /* expects */
 262 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 263 {
 264         struct list_head *e = &nf_conntrack_expect_list;
 265         loff_t i;
 266
 267         /* strange seq_file api calls stop even if we fail,
 268          * thus we need to grab lock since stop unlocks */
 269         read_lock_bh(&nf_conntrack_lock);
 270
 271         if (list_empty(e))
 272                 return NULL;
 273
 274         for (i = 0; i <= *pos; i++) {
 275                 e = e->next;
 276                 if (e == &nf_conntrack_expect_list)
 277                         return NULL;
 278         }
 279         return e;
 280 }
 281
 282 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 283 {
 284         struct list_head *e = v;
 285
 286         ++*pos;
 287         e = e->next;
 288
 289         if (e == &nf_conntrack_expect_list)
 290                 return NULL;
 291
 292         return e;
 293 }
 294
 295 static void exp_seq_stop(struct seq_file *s, void *v)
 296 {
 297         read_unlock_bh(&nf_conntrack_lock);
 298 }
 299
 300 static int exp_seq_show(struct seq_file *s, void *v)
 301 {
 302         struct nf_conntrack_expect *expect = v;
 303
 304         if (expect->timeout.function)
 305                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 306                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 307         else
 308                 seq_printf(s, "- ");
 309         seq_printf(s, "l3proto = %u proto=%u ",
 310                    expect->tuple.src.l3num,
 311                    expect->tuple.dst.protonum);
 312         print_tuple(s, &expect->tuple,
 313                     __nf_ct_l3proto_find(expect->tuple.src.l3num),
 314                     __nf_ct_proto_find(expect->tuple.src.l3num,
 315                                        expect->tuple.dst.protonum));
 316         return seq_putc(s, '\n');
 317 }
 318
 319 static struct seq_operations exp_seq_ops = {
 320         .start = exp_seq_start,
 321         .next = exp_seq_next,
 322         .stop = exp_seq_stop,
 323         .show = exp_seq_show
 324 };
 325
 326 static int exp_open(struct inode *inode, struct file *file)
 327 {
 328         return seq_open(file, &exp_seq_ops);
 329 }
 330
 331 static struct file_operations exp_file_ops = {
 332         .owner   = THIS_MODULE,
 333         .open    = exp_open,
 334         .read    = seq_read,
 335         .llseek  = seq_lseek,
 336         .release = seq_release
 337 };
 338
 339 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 340 {
 341         int cpu;
 342
 343         if (*pos == 0)
 344                 return SEQ_START_TOKEN;
 345
 346         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 347                 if (!cpu_possible(cpu))
 348                         continue;
 349                 *pos = cpu + 1;
 350                 return &per_cpu(nf_conntrack_stat, cpu);
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 357 {
 358         int cpu;
 359
 360         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 361                 if (!cpu_possible(cpu))
 362                         continue;
 363                 *pos = cpu + 1;
 364                 return &per_cpu(nf_conntrack_stat, cpu);
 365         }
 366
 367         return NULL;
 368 }
 369
 370 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 371 {
 372 }
 373
 374 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 375 {
 376         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 377         struct ip_conntrack_stat *st = v;
 378
 379         if (v == SEQ_START_TOKEN) {
 380                 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");
 381                 return 0;
 382         }
 383
 384         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 385                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 386                    nr_conntracks,
 387                    st->searched,
 388                    st->found,
 389                    st->new,
 390                    st->invalid,
 391                    st->ignore,
 392                    st->delete,
 393                    st->delete_list,
 394                    st->insert,
 395                    st->insert_failed,
 396                    st->drop,
 397                    st->early_drop,
 398                    st->error,
 399
 400                    st->expect_new,
 401                    st->expect_create,
 402                    st->expect_delete
 403                 );
 404         return 0;
 405 }
 406
 407 static struct seq_operations ct_cpu_seq_ops = {
 408         .start  = ct_cpu_seq_start,
 409         .next   = ct_cpu_seq_next,
 410         .stop   = ct_cpu_seq_stop,
 411         .show   = ct_cpu_seq_show,
 412 };
 413
 414 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 415 {
 416         return seq_open(file, &ct_cpu_seq_ops);
 417 }
 418
 419 static struct file_operations ct_cpu_seq_fops = {
 420         .owner   = THIS_MODULE,
 421         .open    = ct_cpu_seq_open,
 422         .read    = seq_read,
 423         .llseek  = seq_lseek,
 424         .release = seq_release_private,
 425 };
 426 #endif /* CONFIG_PROC_FS */
 427
 428 /* Sysctl support */
 429
 430 int nf_conntrack_checksum __read_mostly = 1;
 431
 432 #ifdef CONFIG_SYSCTL
 433
 434 /* From nf_conntrack_core.c */
 435 extern int nf_conntrack_max;
 436 extern unsigned int nf_conntrack_htable_size;
 437
 438 /* From nf_conntrack_proto_tcp.c */
 439 extern unsigned int nf_ct_tcp_timeout_syn_sent;
 440 extern unsigned int nf_ct_tcp_timeout_syn_recv;
 441 extern unsigned int nf_ct_tcp_timeout_established;
 442 extern unsigned int nf_ct_tcp_timeout_fin_wait;
 443 extern unsigned int nf_ct_tcp_timeout_close_wait;
 444 extern unsigned int nf_ct_tcp_timeout_last_ack;
 445 extern unsigned int nf_ct_tcp_timeout_time_wait;
 446 extern unsigned int nf_ct_tcp_timeout_close;
 447 extern unsigned int nf_ct_tcp_timeout_max_retrans;
 448 extern int nf_ct_tcp_loose;
 449 extern int nf_ct_tcp_be_liberal;
 450 extern int nf_ct_tcp_max_retrans;
 451
 452 /* From nf_conntrack_proto_udp.c */
 453 extern unsigned int nf_ct_udp_timeout;
 454 extern unsigned int nf_ct_udp_timeout_stream;
 455
 456 /* From nf_conntrack_proto_generic.c */
 457 extern unsigned int nf_ct_generic_timeout;
 458
 459 /* Log invalid packets of a given protocol */
 460 static int log_invalid_proto_min = 0;
 461 static int log_invalid_proto_max = 255;
 462
 463 static struct ctl_table_header *nf_ct_sysctl_header;
 464
 465 static ctl_table nf_ct_sysctl_table[] = {
 466         {
 467                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 468                 .procname       = "nf_conntrack_max",
 469                 .data           = &nf_conntrack_max,
 470                 .maxlen         = sizeof(int),
 471                 .mode           = 0644,
 472                 .proc_handler   = &proc_dointvec,
 473         },
 474         {
 475                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 476                 .procname       = "nf_conntrack_count",
 477                 .data           = &nf_conntrack_count,
 478                 .maxlen         = sizeof(int),
 479                 .mode           = 0444,
 480                 .proc_handler   = &proc_dointvec,
 481         },
 482         {
 483                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 484                 .procname       = "nf_conntrack_buckets",
 485                 .data           = &nf_conntrack_htable_size,
 486                 .maxlen         = sizeof(unsigned int),
 487                 .mode           = 0444,
 488                 .proc_handler   = &proc_dointvec,
 489         },
 490         {
 491                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 492                 .procname       = "nf_conntrack_checksum",
 493                 .data           = &nf_conntrack_checksum,
 494                 .maxlen         = sizeof(unsigned int),
 495                 .mode           = 0644,
 496                 .proc_handler   = &proc_dointvec,
 497         },
 498         {
 499                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 500                 .procname       = "nf_conntrack_tcp_timeout_syn_sent",
 501                 .data           = &nf_ct_tcp_timeout_syn_sent,
 502                 .maxlen         = sizeof(unsigned int),
 503                 .mode           = 0644,
 504                 .proc_handler   = &proc_dointvec_jiffies,
 505         },
 506         {
 507                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 508                 .procname       = "nf_conntrack_tcp_timeout_syn_recv",
 509                 .data           = &nf_ct_tcp_timeout_syn_recv,
 510                 .maxlen         = sizeof(unsigned int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_dointvec_jiffies,
 513         },
 514         {
 515                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 516                 .procname       = "nf_conntrack_tcp_timeout_established",
 517                 .data           = &nf_ct_tcp_timeout_established,
 518                 .maxlen         = sizeof(unsigned int),
 519                 .mode           = 0644,
 520                 .proc_handler   = &proc_dointvec_jiffies,
 521         },
 522         {
 523                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 524                 .procname       = "nf_conntrack_tcp_timeout_fin_wait",
 525                 .data           = &nf_ct_tcp_timeout_fin_wait,
 526                 .maxlen         = sizeof(unsigned int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec_jiffies,
 529         },
 530         {
 531                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 532                 .procname       = "nf_conntrack_tcp_timeout_close_wait",
 533                 .data           = &nf_ct_tcp_timeout_close_wait,
 534                 .maxlen         = sizeof(unsigned int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec_jiffies,
 537         },
 538         {
 539                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 540                 .procname       = "nf_conntrack_tcp_timeout_last_ack",
 541                 .data           = &nf_ct_tcp_timeout_last_ack,
 542                 .maxlen         = sizeof(unsigned int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec_jiffies,
 545         },
 546         {
 547                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 548                 .procname       = "nf_conntrack_tcp_timeout_time_wait",
 549                 .data           = &nf_ct_tcp_timeout_time_wait,
 550                 .maxlen         = sizeof(unsigned int),
 551                 .mode           = 0644,
 552                 .proc_handler   = &proc_dointvec_jiffies,
 553         },
 554         {
 555                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 556                 .procname       = "nf_conntrack_tcp_timeout_close",
 557                 .data           = &nf_ct_tcp_timeout_close,
 558                 .maxlen         = sizeof(unsigned int),
 559                 .mode           = 0644,
 560                 .proc_handler   = &proc_dointvec_jiffies,
 561         },
 562         {
 563                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT,
 564                 .procname       = "nf_conntrack_udp_timeout",
 565                 .data           = &nf_ct_udp_timeout,
 566                 .maxlen         = sizeof(unsigned int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec_jiffies,
 569         },
 570         {
 571                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 572                 .procname       = "nf_conntrack_udp_timeout_stream",
 573                 .data           = &nf_ct_udp_timeout_stream,
 574                 .maxlen         = sizeof(unsigned int),
 575                 .mode           = 0644,
 576                 .proc_handler   = &proc_dointvec_jiffies,
 577         },
 578         {
 579                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
 580                 .procname       = "nf_conntrack_generic_timeout",
 581                 .data           = &nf_ct_generic_timeout,
 582                 .maxlen         = sizeof(unsigned int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec_jiffies,
 585         },
 586         {
 587                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 588                 .procname       = "nf_conntrack_log_invalid",
 589                 .data           = &nf_ct_log_invalid,
 590                 .maxlen         = sizeof(unsigned int),
 591                 .mode           = 0644,
 592                 .proc_handler   = &proc_dointvec_minmax,
 593                 .strategy       = &sysctl_intvec,
 594                 .extra1         = &log_invalid_proto_min,
 595                 .extra2         = &log_invalid_proto_max,
 596         },
 597         {
 598                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 599                 .procname       = "nf_conntrack_tcp_timeout_max_retrans",
 600                 .data           = &nf_ct_tcp_timeout_max_retrans,
 601                 .maxlen         = sizeof(unsigned int),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec_jiffies,
 604         },
 605         {
 606                 .ctl_name       = NET_NF_CONNTRACK_TCP_LOOSE,
 607                 .procname       = "nf_conntrack_tcp_loose",
 608                 .data           = &nf_ct_tcp_loose,
 609                 .maxlen         = sizeof(unsigned int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec,
 612         },
 613         {
 614                 .ctl_name       = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
 615                 .procname       = "nf_conntrack_tcp_be_liberal",
 616                 .data           = &nf_ct_tcp_be_liberal,
 617                 .maxlen         = sizeof(unsigned int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621         {
 622                 .ctl_name       = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
 623                 .procname       = "nf_conntrack_tcp_max_retrans",
 624                 .data           = &nf_ct_tcp_max_retrans,
 625                 .maxlen         = sizeof(unsigned int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec,
 628         },
 629
 630         { .ctl_name = 0 }
 631 };
 632
 633 #define NET_NF_CONNTRACK_MAX 2089
 634
 635 static ctl_table nf_ct_netfilter_table[] = {
 636         {
 637                 .ctl_name       = NET_NETFILTER,
 638                 .procname       = "netfilter",
 639                 .mode           = 0555,
 640                 .child          = nf_ct_sysctl_table,
 641         },
 642         {
 643                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 644                 .procname       = "nf_conntrack_max",
 645                 .data           = &nf_conntrack_max,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650         { .ctl_name = 0 }
 651 };
 652
 653 static ctl_table nf_ct_net_table[] = {
 654         {
 655                 .ctl_name       = CTL_NET,
 656                 .procname       = "net",
 657                 .mode           = 0555,
 658                 .child          = nf_ct_netfilter_table,
 659         },
 660         { .ctl_name = 0 }
 661 };
 662 EXPORT_SYMBOL(nf_ct_log_invalid);
 663 #endif /* CONFIG_SYSCTL */
 664
 665 int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
 666 {
 667         int ret = 0;
 668
 669         write_lock_bh(&nf_conntrack_lock);
 670         if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
 671                 ret = -EBUSY;
 672                 goto out;
 673         }
 674         nf_ct_l3protos[proto->l3proto] = proto;
 675 out:
 676         write_unlock_bh(&nf_conntrack_lock);
 677
 678         return ret;
 679 }
 680
 681 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 682 {
 683         write_lock_bh(&nf_conntrack_lock);
 684         nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
 685         write_unlock_bh(&nf_conntrack_lock);
 686
 687         /* Somebody could be still looking at the proto in bh. */
 688         synchronize_net();
 689
 690         /* Remove all contrack entries for this protocol */
 691         nf_ct_iterate_cleanup(kill_l3proto, proto);
 692 }
 693
 694 /* FIXME: Allow NULL functions and sub in pointers to generic for
 695    them. --RR */
 696 int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
 697 {
 698         int ret = 0;
 699
 700 retry:
 701         write_lock_bh(&nf_conntrack_lock);
 702         if (nf_ct_protos[proto->l3proto]) {
 703                 if (nf_ct_protos[proto->l3proto][proto->proto]
 704                                 != &nf_conntrack_generic_protocol) {
 705                         ret = -EBUSY;
 706                         goto out_unlock;
 707                 }
 708         } else {
 709                 /* l3proto may be loaded latter. */
 710                 struct nf_conntrack_protocol **proto_array;
 711                 int i;
 712
 713                 write_unlock_bh(&nf_conntrack_lock);
 714
 715                 proto_array = (struct nf_conntrack_protocol **)
 716                                 kmalloc(MAX_NF_CT_PROTO *
 717                                          sizeof(struct nf_conntrack_protocol *),
 718                                         GFP_KERNEL);
 719                 if (proto_array == NULL) {
 720                         ret = -ENOMEM;
 721                         goto out;
 722                 }
 723                 for (i = 0; i < MAX_NF_CT_PROTO; i++)
 724                         proto_array[i] = &nf_conntrack_generic_protocol;
 725
 726                 write_lock_bh(&nf_conntrack_lock);
 727                 if (nf_ct_protos[proto->l3proto]) {
 728                         /* bad timing, but no problem */
 729                         write_unlock_bh(&nf_conntrack_lock);
 730                         kfree(proto_array);
 731                 } else {
 732                         nf_ct_protos[proto->l3proto] = proto_array;
 733                         write_unlock_bh(&nf_conntrack_lock);
 734                 }
 735
 736                 /*
 737                  * Just once because array is never freed until unloading
 738                  * nf_conntrack.ko
 739                  */
 740                 goto retry;
 741         }
 742
 743         nf_ct_protos[proto->l3proto][proto->proto] = proto;
 744
 745 out_unlock:
 746         write_unlock_bh(&nf_conntrack_lock);
 747 out:
 748         return ret;
 749 }
 750
 751 void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
 752 {
 753         write_lock_bh(&nf_conntrack_lock);
 754         nf_ct_protos[proto->l3proto][proto->proto]
 755                 = &nf_conntrack_generic_protocol;
 756         write_unlock_bh(&nf_conntrack_lock);
 757
 758         /* Somebody could be still looking at the proto in bh. */
 759         synchronize_net();
 760
 761         /* Remove all contrack entries for this protocol */
 762         nf_ct_iterate_cleanup(kill_proto, proto);
 763 }
 764
 765 static int __init nf_conntrack_standalone_init(void)
 766 {
 767 #ifdef CONFIG_PROC_FS
 768         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 769 #endif
 770         int ret = 0;
 771
 772         ret = nf_conntrack_init();
 773         if (ret < 0)
 774                 return ret;
 775
 776 #ifdef CONFIG_PROC_FS
 777         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 778         if (!proc) goto cleanup_init;
 779
 780         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 781                                         &exp_file_ops);
 782         if (!proc_exp) goto cleanup_proc;
 783
 784         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 785         if (!proc_stat)
 786                 goto cleanup_proc_exp;
 787
 788         proc_stat->proc_fops = &ct_cpu_seq_fops;
 789         proc_stat->owner = THIS_MODULE;
 790 #endif
 791 #ifdef CONFIG_SYSCTL
 792         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 793         if (nf_ct_sysctl_header == NULL) {
 794                 printk("nf_conntrack: can't register to sysctl.\n");
 795                 ret = -ENOMEM;
 796                 goto cleanup_proc_stat;
 797         }
 798 #endif
 799         return ret;
 800
 801 #ifdef CONFIG_SYSCTL
 802  cleanup_proc_stat:
 803 #endif
 804 #ifdef CONFIG_PROC_FS
 805         remove_proc_entry("nf_conntrack", proc_net_stat);
 806  cleanup_proc_exp:
 807         proc_net_remove("nf_conntrack_expect");
 808  cleanup_proc:
 809         proc_net_remove("nf_conntrack");
 810  cleanup_init:
 811 #endif /* CNFIG_PROC_FS */
 812         nf_conntrack_cleanup();
 813         return ret;
 814 }
 815
 816 static void __exit nf_conntrack_standalone_fini(void)
 817 {
 818 #ifdef CONFIG_SYSCTL
 819         unregister_sysctl_table(nf_ct_sysctl_header);
 820 #endif
 821 #ifdef CONFIG_PROC_FS
 822         remove_proc_entry("nf_conntrack", proc_net_stat);
 823         proc_net_remove("nf_conntrack_expect");
 824         proc_net_remove("nf_conntrack");
 825 #endif /* CNFIG_PROC_FS */
 826         nf_conntrack_cleanup();
 827 }
 828
 829 module_init(nf_conntrack_standalone_init);
 830 module_exit(nf_conntrack_standalone_fini);
 831
 832 /* Some modules need us, but don't depend directly on any symbol.
 833    They should call this. */
 834 void need_conntrack(void)
 835 {
 836 }
 837
 838 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 839 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 840 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 841 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 842 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 843 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 844 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 845 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 846 #endif
 847 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
 848 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
 849 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 850 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 851 EXPORT_SYMBOL(nf_conntrack_protocol_register);
 852 EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
 853 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 854 EXPORT_SYMBOL(nf_conntrack_destroyed);
 855 EXPORT_SYMBOL(need_conntrack);
 856 EXPORT_SYMBOL(nf_conntrack_helper_register);
 857 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 858 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 859 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 860 EXPORT_SYMBOL(nf_ct_protos);
 861 EXPORT_SYMBOL(__nf_ct_proto_find);
 862 EXPORT_SYMBOL(nf_ct_proto_find_get);
 863 EXPORT_SYMBOL(nf_ct_proto_put);
 864 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 865 EXPORT_SYMBOL(nf_ct_l3proto_put);
 866 EXPORT_SYMBOL(nf_ct_l3protos);
 867 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 868 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 869 EXPORT_SYMBOL(nf_conntrack_expect_put);
 870 EXPORT_SYMBOL(nf_conntrack_expect_related);
 871 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 872 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 873 EXPORT_SYMBOL(nf_conntrack_htable_size);
 874 EXPORT_SYMBOL(nf_conntrack_lock);
 875 EXPORT_SYMBOL(nf_conntrack_hash);
 876 EXPORT_SYMBOL(nf_conntrack_untracked);
 877 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 878 #ifdef CONFIG_IP_NF_NAT_NEEDED
 879 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 880 #endif
 881 EXPORT_SYMBOL(__nf_conntrack_confirm);
 882 EXPORT_SYMBOL(nf_ct_get_tuple);
 883 EXPORT_SYMBOL(nf_ct_invert_tuple);
 884 EXPORT_SYMBOL(nf_conntrack_in);
 885 EXPORT_SYMBOL(__nf_conntrack_attach);
 886 EXPORT_SYMBOL(nf_conntrack_alloc);
 887 EXPORT_SYMBOL(nf_conntrack_free);
 888 EXPORT_SYMBOL(nf_conntrack_flush);
 889 EXPORT_SYMBOL(nf_ct_remove_expectations);
 890 EXPORT_SYMBOL(nf_ct_helper_find_get);
 891 EXPORT_SYMBOL(nf_ct_helper_put);
 892 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 893 EXPORT_SYMBOL(__nf_conntrack_find);
 894 EXPORT_SYMBOL(nf_ct_unlink_expect);
 895 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 896 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 897 EXPORT_SYMBOL(nf_conntrack_expect_find);
 898 EXPORT_SYMBOL(nf_conntrack_expect_list);
 899 #if defined(CONFIG_NF_CT_NETLINK) || \
 900     defined(CONFIG_NF_CT_NETLINK_MODULE)
 901 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 902 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 903 #endif