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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/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 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 217         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 218                 return -ENOSPC;
 219 #endif
 220
 221         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 222                 return -ENOSPC;
 223
 224         return 0;
 225 }
 226
 227 static struct seq_operations ct_seq_ops = {
 228         .start = ct_seq_start,
 229         .next  = ct_seq_next,
 230         .stop  = ct_seq_stop,
 231         .show  = ct_seq_show
 232 };
 233
 234 static int ct_open(struct inode *inode, struct file *file)
 235 {
 236         struct seq_file *seq;
 237         struct ct_iter_state *st;
 238         int ret;
 239
 240         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 241         if (st == NULL)
 242                 return -ENOMEM;
 243         ret = seq_open(file, &ct_seq_ops);
 244         if (ret)
 245                 goto out_free;
 246         seq          = file->private_data;
 247         seq->private = st;
 248         memset(st, 0, sizeof(struct ct_iter_state));
 249         return ret;
 250 out_free:
 251         kfree(st);
 252         return ret;
 253 }
 254
 255 static struct file_operations ct_file_ops = {
 256         .owner   = THIS_MODULE,
 257         .open    = ct_open,
 258         .read    = seq_read,
 259         .llseek  = seq_lseek,
 260         .release = seq_release_private,
 261 };
 262
 263 /* expects */
 264 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 265 {
 266         struct list_head *e = &nf_conntrack_expect_list;
 267         loff_t i;
 268
 269         /* strange seq_file api calls stop even if we fail,
 270          * thus we need to grab lock since stop unlocks */
 271         read_lock_bh(&nf_conntrack_lock);
 272
 273         if (list_empty(e))
 274                 return NULL;
 275
 276         for (i = 0; i <= *pos; i++) {
 277                 e = e->next;
 278                 if (e == &nf_conntrack_expect_list)
 279                         return NULL;
 280         }
 281         return e;
 282 }
 283
 284 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 285 {
 286         struct list_head *e = v;
 287
 288         ++*pos;
 289         e = e->next;
 290
 291         if (e == &nf_conntrack_expect_list)
 292                 return NULL;
 293
 294         return e;
 295 }
 296
 297 static void exp_seq_stop(struct seq_file *s, void *v)
 298 {
 299         read_unlock_bh(&nf_conntrack_lock);
 300 }
 301
 302 static int exp_seq_show(struct seq_file *s, void *v)
 303 {
 304         struct nf_conntrack_expect *expect = v;
 305
 306         if (expect->timeout.function)
 307                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 308                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 309         else
 310                 seq_printf(s, "- ");
 311         seq_printf(s, "l3proto = %u proto=%u ",
 312                    expect->tuple.src.l3num,
 313                    expect->tuple.dst.protonum);
 314         print_tuple(s, &expect->tuple,
 315                     __nf_ct_l3proto_find(expect->tuple.src.l3num),
 316                     __nf_ct_proto_find(expect->tuple.src.l3num,
 317                                        expect->tuple.dst.protonum));
 318         return seq_putc(s, '\n');
 319 }
 320
 321 static struct seq_operations exp_seq_ops = {
 322         .start = exp_seq_start,
 323         .next = exp_seq_next,
 324         .stop = exp_seq_stop,
 325         .show = exp_seq_show
 326 };
 327
 328 static int exp_open(struct inode *inode, struct file *file)
 329 {
 330         return seq_open(file, &exp_seq_ops);
 331 }
 332
 333 static struct file_operations exp_file_ops = {
 334         .owner   = THIS_MODULE,
 335         .open    = exp_open,
 336         .read    = seq_read,
 337         .llseek  = seq_lseek,
 338         .release = seq_release
 339 };
 340
 341 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 342 {
 343         int cpu;
 344
 345         if (*pos == 0)
 346                 return SEQ_START_TOKEN;
 347
 348         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 349                 if (!cpu_possible(cpu))
 350                         continue;
 351                 *pos = cpu + 1;
 352                 return &per_cpu(nf_conntrack_stat, cpu);
 353         }
 354
 355         return NULL;
 356 }
 357
 358 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 359 {
 360         int cpu;
 361
 362         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 363                 if (!cpu_possible(cpu))
 364                         continue;
 365                 *pos = cpu + 1;
 366                 return &per_cpu(nf_conntrack_stat, cpu);
 367         }
 368
 369         return NULL;
 370 }
 371
 372 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 373 {
 374 }
 375
 376 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 377 {
 378         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 379         struct ip_conntrack_stat *st = v;
 380
 381         if (v == SEQ_START_TOKEN) {
 382                 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");
 383                 return 0;
 384         }
 385
 386         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 387                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 388                    nr_conntracks,
 389                    st->searched,
 390                    st->found,
 391                    st->new,
 392                    st->invalid,
 393                    st->ignore,
 394                    st->delete,
 395                    st->delete_list,
 396                    st->insert,
 397                    st->insert_failed,
 398                    st->drop,
 399                    st->early_drop,
 400                    st->error,
 401
 402                    st->expect_new,
 403                    st->expect_create,
 404                    st->expect_delete
 405                 );
 406         return 0;
 407 }
 408
 409 static struct seq_operations ct_cpu_seq_ops = {
 410         .start  = ct_cpu_seq_start,
 411         .next   = ct_cpu_seq_next,
 412         .stop   = ct_cpu_seq_stop,
 413         .show   = ct_cpu_seq_show,
 414 };
 415
 416 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 417 {
 418         return seq_open(file, &ct_cpu_seq_ops);
 419 }
 420
 421 static struct file_operations ct_cpu_seq_fops = {
 422         .owner   = THIS_MODULE,
 423         .open    = ct_cpu_seq_open,
 424         .read    = seq_read,
 425         .llseek  = seq_lseek,
 426         .release = seq_release_private,
 427 };
 428 #endif /* CONFIG_PROC_FS */
 429
 430 /* Sysctl support */
 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 int nf_conntrack_checksum = 1;
 464
 465 static struct ctl_table_header *nf_ct_sysctl_header;
 466
 467 static ctl_table nf_ct_sysctl_table[] = {
 468         {
 469                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 470                 .procname       = "nf_conntrack_max",
 471                 .data           = &nf_conntrack_max,
 472                 .maxlen         = sizeof(int),
 473                 .mode           = 0644,
 474                 .proc_handler   = &proc_dointvec,
 475         },
 476         {
 477                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 478                 .procname       = "nf_conntrack_count",
 479                 .data           = &nf_conntrack_count,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0444,
 482                 .proc_handler   = &proc_dointvec,
 483         },
 484         {
 485                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 486                 .procname       = "nf_conntrack_buckets",
 487                 .data           = &nf_conntrack_htable_size,
 488                 .maxlen         = sizeof(unsigned int),
 489                 .mode           = 0444,
 490                 .proc_handler   = &proc_dointvec,
 491         },
 492         {
 493                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 494                 .procname       = "nf_conntrack_checksum",
 495                 .data           = &nf_conntrack_checksum,
 496                 .maxlen         = sizeof(unsigned int),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dointvec,
 499         },
 500         {
 501                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 502                 .procname       = "nf_conntrack_tcp_timeout_syn_sent",
 503                 .data           = &nf_ct_tcp_timeout_syn_sent,
 504                 .maxlen         = sizeof(unsigned int),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_dointvec_jiffies,
 507         },
 508         {
 509                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 510                 .procname       = "nf_conntrack_tcp_timeout_syn_recv",
 511                 .data           = &nf_ct_tcp_timeout_syn_recv,
 512                 .maxlen         = sizeof(unsigned int),
 513                 .mode           = 0644,
 514                 .proc_handler   = &proc_dointvec_jiffies,
 515         },
 516         {
 517                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 518                 .procname       = "nf_conntrack_tcp_timeout_established",
 519                 .data           = &nf_ct_tcp_timeout_established,
 520                 .maxlen         = sizeof(unsigned int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec_jiffies,
 523         },
 524         {
 525                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 526                 .procname       = "nf_conntrack_tcp_timeout_fin_wait",
 527                 .data           = &nf_ct_tcp_timeout_fin_wait,
 528                 .maxlen         = sizeof(unsigned int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec_jiffies,
 531         },
 532         {
 533                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 534                 .procname       = "nf_conntrack_tcp_timeout_close_wait",
 535                 .data           = &nf_ct_tcp_timeout_close_wait,
 536                 .maxlen         = sizeof(unsigned int),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec_jiffies,
 539         },
 540         {
 541                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 542                 .procname       = "nf_conntrack_tcp_timeout_last_ack",
 543                 .data           = &nf_ct_tcp_timeout_last_ack,
 544                 .maxlen         = sizeof(unsigned int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec_jiffies,
 547         },
 548         {
 549                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 550                 .procname       = "nf_conntrack_tcp_timeout_time_wait",
 551                 .data           = &nf_ct_tcp_timeout_time_wait,
 552                 .maxlen         = sizeof(unsigned int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec_jiffies,
 555         },
 556         {
 557                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 558                 .procname       = "nf_conntrack_tcp_timeout_close",
 559                 .data           = &nf_ct_tcp_timeout_close,
 560                 .maxlen         = sizeof(unsigned int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec_jiffies,
 563         },
 564         {
 565                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT,
 566                 .procname       = "nf_conntrack_udp_timeout",
 567                 .data           = &nf_ct_udp_timeout,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec_jiffies,
 571         },
 572         {
 573                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 574                 .procname       = "nf_conntrack_udp_timeout_stream",
 575                 .data           = &nf_ct_udp_timeout_stream,
 576                 .maxlen         = sizeof(unsigned int),
 577                 .mode           = 0644,
 578                 .proc_handler   = &proc_dointvec_jiffies,
 579         },
 580         {
 581                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
 582                 .procname       = "nf_conntrack_generic_timeout",
 583                 .data           = &nf_ct_generic_timeout,
 584                 .maxlen         = sizeof(unsigned int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec_jiffies,
 587         },
 588         {
 589                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 590                 .procname       = "nf_conntrack_log_invalid",
 591                 .data           = &nf_ct_log_invalid,
 592                 .maxlen         = sizeof(unsigned int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec_minmax,
 595                 .strategy       = &sysctl_intvec,
 596                 .extra1         = &log_invalid_proto_min,
 597                 .extra2         = &log_invalid_proto_max,
 598         },
 599         {
 600                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 601                 .procname       = "nf_conntrack_tcp_timeout_max_retrans",
 602                 .data           = &nf_ct_tcp_timeout_max_retrans,
 603                 .maxlen         = sizeof(unsigned int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec_jiffies,
 606         },
 607         {
 608                 .ctl_name       = NET_NF_CONNTRACK_TCP_LOOSE,
 609                 .procname       = "nf_conntrack_tcp_loose",
 610                 .data           = &nf_ct_tcp_loose,
 611                 .maxlen         = sizeof(unsigned int),
 612                 .mode           = 0644,
 613                 .proc_handler   = &proc_dointvec,
 614         },
 615         {
 616                 .ctl_name       = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
 617                 .procname       = "nf_conntrack_tcp_be_liberal",
 618                 .data           = &nf_ct_tcp_be_liberal,
 619                 .maxlen         = sizeof(unsigned int),
 620                 .mode           = 0644,
 621                 .proc_handler   = &proc_dointvec,
 622         },
 623         {
 624                 .ctl_name       = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
 625                 .procname       = "nf_conntrack_tcp_max_retrans",
 626                 .data           = &nf_ct_tcp_max_retrans,
 627                 .maxlen         = sizeof(unsigned int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631
 632         { .ctl_name = 0 }
 633 };
 634
 635 #define NET_NF_CONNTRACK_MAX 2089
 636
 637 static ctl_table nf_ct_netfilter_table[] = {
 638         {
 639                 .ctl_name       = NET_NETFILTER,
 640                 .procname       = "netfilter",
 641                 .mode           = 0555,
 642                 .child          = nf_ct_sysctl_table,
 643         },
 644         {
 645                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 646                 .procname       = "nf_conntrack_max",
 647                 .data           = &nf_conntrack_max,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec,
 651         },
 652         { .ctl_name = 0 }
 653 };
 654
 655 static ctl_table nf_ct_net_table[] = {
 656         {
 657                 .ctl_name       = CTL_NET,
 658                 .procname       = "net",
 659                 .mode           = 0555,
 660                 .child          = nf_ct_netfilter_table,
 661         },
 662         { .ctl_name = 0 }
 663 };
 664 EXPORT_SYMBOL(nf_ct_log_invalid);
 665 #endif /* CONFIG_SYSCTL */
 666
 667 int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
 668 {
 669         int ret = 0;
 670
 671         write_lock_bh(&nf_conntrack_lock);
 672         if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
 673                 ret = -EBUSY;
 674                 goto out;
 675         }
 676         nf_ct_l3protos[proto->l3proto] = proto;
 677 out:
 678         write_unlock_bh(&nf_conntrack_lock);
 679
 680         return ret;
 681 }
 682
 683 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 684 {
 685         write_lock_bh(&nf_conntrack_lock);
 686         nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
 687         write_unlock_bh(&nf_conntrack_lock);
 688
 689         /* Somebody could be still looking at the proto in bh. */
 690         synchronize_net();
 691
 692         /* Remove all contrack entries for this protocol */
 693         nf_ct_iterate_cleanup(kill_l3proto, proto);
 694 }
 695
 696 /* FIXME: Allow NULL functions and sub in pointers to generic for
 697    them. --RR */
 698 int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
 699 {
 700         int ret = 0;
 701
 702 retry:
 703         write_lock_bh(&nf_conntrack_lock);
 704         if (nf_ct_protos[proto->l3proto]) {
 705                 if (nf_ct_protos[proto->l3proto][proto->proto]
 706                                 != &nf_conntrack_generic_protocol) {
 707                         ret = -EBUSY;
 708                         goto out_unlock;
 709                 }
 710         } else {
 711                 /* l3proto may be loaded latter. */
 712                 struct nf_conntrack_protocol **proto_array;
 713                 int i;
 714
 715                 write_unlock_bh(&nf_conntrack_lock);
 716
 717                 proto_array = (struct nf_conntrack_protocol **)
 718                                 kmalloc(MAX_NF_CT_PROTO *
 719                                          sizeof(struct nf_conntrack_protocol *),
 720                                         GFP_KERNEL);
 721                 if (proto_array == NULL) {
 722                         ret = -ENOMEM;
 723                         goto out;
 724                 }
 725                 for (i = 0; i < MAX_NF_CT_PROTO; i++)
 726                         proto_array[i] = &nf_conntrack_generic_protocol;
 727
 728                 write_lock_bh(&nf_conntrack_lock);
 729                 if (nf_ct_protos[proto->l3proto]) {
 730                         /* bad timing, but no problem */
 731                         write_unlock_bh(&nf_conntrack_lock);
 732                         kfree(proto_array);
 733                 } else {
 734                         nf_ct_protos[proto->l3proto] = proto_array;
 735                         write_unlock_bh(&nf_conntrack_lock);
 736                 }
 737
 738                 /*
 739                  * Just once because array is never freed until unloading
 740                  * nf_conntrack.ko
 741                  */
 742                 goto retry;
 743         }
 744
 745         nf_ct_protos[proto->l3proto][proto->proto] = proto;
 746
 747 out_unlock:
 748         write_unlock_bh(&nf_conntrack_lock);
 749 out:
 750         return ret;
 751 }
 752
 753 void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
 754 {
 755         write_lock_bh(&nf_conntrack_lock);
 756         nf_ct_protos[proto->l3proto][proto->proto]
 757                 = &nf_conntrack_generic_protocol;
 758         write_unlock_bh(&nf_conntrack_lock);
 759
 760         /* Somebody could be still looking at the proto in bh. */
 761         synchronize_net();
 762
 763         /* Remove all contrack entries for this protocol */
 764         nf_ct_iterate_cleanup(kill_proto, proto);
 765 }
 766
 767 static int __init nf_conntrack_standalone_init(void)
 768 {
 769 #ifdef CONFIG_PROC_FS
 770         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 771 #endif
 772         int ret = 0;
 773
 774         ret = nf_conntrack_init();
 775         if (ret < 0)
 776                 return ret;
 777
 778 #ifdef CONFIG_PROC_FS
 779         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 780         if (!proc) goto cleanup_init;
 781
 782         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 783                                         &exp_file_ops);
 784         if (!proc_exp) goto cleanup_proc;
 785
 786         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 787         if (!proc_stat)
 788                 goto cleanup_proc_exp;
 789
 790         proc_stat->proc_fops = &ct_cpu_seq_fops;
 791         proc_stat->owner = THIS_MODULE;
 792 #endif
 793 #ifdef CONFIG_SYSCTL
 794         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 795         if (nf_ct_sysctl_header == NULL) {
 796                 printk("nf_conntrack: can't register to sysctl.\n");
 797                 ret = -ENOMEM;
 798                 goto cleanup_proc_stat;
 799         }
 800 #endif
 801         return ret;
 802
 803 #ifdef CONFIG_SYSCTL
 804  cleanup_proc_stat:
 805 #endif
 806 #ifdef CONFIG_PROC_FS
 807         remove_proc_entry("nf_conntrack", proc_net_stat);
 808  cleanup_proc_exp:
 809         proc_net_remove("nf_conntrack_expect");
 810  cleanup_proc:
 811         proc_net_remove("nf_conntrack");
 812  cleanup_init:
 813 #endif /* CNFIG_PROC_FS */
 814         nf_conntrack_cleanup();
 815         return ret;
 816 }
 817
 818 static void __exit nf_conntrack_standalone_fini(void)
 819 {
 820 #ifdef CONFIG_SYSCTL
 821         unregister_sysctl_table(nf_ct_sysctl_header);
 822 #endif
 823 #ifdef CONFIG_PROC_FS
 824         remove_proc_entry("nf_conntrack", proc_net_stat);
 825         proc_net_remove("nf_conntrack_expect");
 826         proc_net_remove("nf_conntrack");
 827 #endif /* CNFIG_PROC_FS */
 828         nf_conntrack_cleanup();
 829 }
 830
 831 module_init(nf_conntrack_standalone_init);
 832 module_exit(nf_conntrack_standalone_fini);
 833
 834 /* Some modules need us, but don't depend directly on any symbol.
 835    They should call this. */
 836 void need_conntrack(void)
 837 {
 838 }
 839
 840 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 841 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 842 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 843 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 844 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 845 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 846 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 847 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 848 #endif
 849 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
 850 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
 851 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 852 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 853 EXPORT_SYMBOL(nf_conntrack_protocol_register);
 854 EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
 855 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 856 EXPORT_SYMBOL(nf_conntrack_destroyed);
 857 EXPORT_SYMBOL(need_conntrack);
 858 EXPORT_SYMBOL(nf_conntrack_helper_register);
 859 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 860 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 861 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 862 EXPORT_SYMBOL(nf_ct_protos);
 863 EXPORT_SYMBOL(__nf_ct_proto_find);
 864 EXPORT_SYMBOL(nf_ct_proto_find_get);
 865 EXPORT_SYMBOL(nf_ct_proto_put);
 866 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 867 EXPORT_SYMBOL(nf_ct_l3proto_put);
 868 EXPORT_SYMBOL(nf_ct_l3protos);
 869 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 870 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 871 EXPORT_SYMBOL(nf_conntrack_expect_put);
 872 EXPORT_SYMBOL(nf_conntrack_expect_related);
 873 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 874 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 875 EXPORT_SYMBOL(nf_conntrack_htable_size);
 876 EXPORT_SYMBOL(nf_conntrack_lock);
 877 EXPORT_SYMBOL(nf_conntrack_hash);
 878 EXPORT_SYMBOL(nf_conntrack_untracked);
 879 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 880 #ifdef CONFIG_IP_NF_NAT_NEEDED
 881 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 882 #endif
 883 EXPORT_SYMBOL(__nf_conntrack_confirm);
 884 EXPORT_SYMBOL(nf_ct_get_tuple);
 885 EXPORT_SYMBOL(nf_ct_invert_tuple);
 886 EXPORT_SYMBOL(nf_conntrack_in);
 887 EXPORT_SYMBOL(__nf_conntrack_attach);
 888 EXPORT_SYMBOL(nf_conntrack_alloc);
 889 EXPORT_SYMBOL(nf_conntrack_free);
 890 EXPORT_SYMBOL(nf_conntrack_flush);
 891 EXPORT_SYMBOL(nf_ct_remove_expectations);
 892 EXPORT_SYMBOL(nf_ct_helper_find_get);
 893 EXPORT_SYMBOL(nf_ct_helper_put);
 894 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 895 EXPORT_SYMBOL(__nf_conntrack_find);
 896 EXPORT_SYMBOL(nf_ct_unlink_expect);
 897 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 898 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 899 EXPORT_SYMBOL(nf_conntrack_expect_find);
 900 EXPORT_SYMBOL(nf_conntrack_expect_list);
 901 #if defined(CONFIG_NF_CT_NETLINK) || \
 902     defined(CONFIG_NF_CT_NETLINK_MODULE)
 903 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 904 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 905 #endif