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/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 #include <linux/netfilter_ipv4/listhelp.h>
  41
  42 #if 0
  43 #define DEBUGP printk
  44 #else
  45 #define DEBUGP(format, args...)
  46 #endif
  47
  48 MODULE_LICENSE("GPL");
  49
  50 extern atomic_t nf_conntrack_count;
  51 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
  52
  53 static int kill_l3proto(struct nf_conn *i, void *data)
  54 {
  55         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  56                         ((struct nf_conntrack_l3proto *)data)->l3proto);
  57 }
  58
  59 static int kill_proto(struct nf_conn *i, void *data)
  60 {
  61         struct nf_conntrack_protocol *proto;
  62         proto = (struct nf_conntrack_protocol *)data;
  63         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  64                         proto->proto) &&
  65                (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
  66                         proto->l3proto);
  67 }
  68
  69 #ifdef CONFIG_PROC_FS
  70 static int
  71 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  72             struct nf_conntrack_l3proto *l3proto,
  73             struct nf_conntrack_protocol *proto)
  74 {
  75         return l3proto->print_tuple(s, tuple) || proto->print_tuple(s, tuple);
  76 }
  77
  78 #ifdef CONFIG_NF_CT_ACCT
  79 static unsigned int
  80 seq_print_counters(struct seq_file *s,
  81                    const struct ip_conntrack_counter *counter)
  82 {
  83         return seq_printf(s, "packets=%llu bytes=%llu ",
  84                           (unsigned long long)counter->packets,
  85                           (unsigned long long)counter->bytes);
  86 }
  87 #else
  88 #define seq_print_counters(x, y)        0
  89 #endif
  90
  91 struct ct_iter_state {
  92         unsigned int bucket;
  93 };
  94
  95 static struct list_head *ct_get_first(struct seq_file *seq)
  96 {
  97         struct ct_iter_state *st = seq->private;
  98
  99         for (st->bucket = 0;
 100              st->bucket < nf_conntrack_htable_size;
 101              st->bucket++) {
 102                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
 103                         return nf_conntrack_hash[st->bucket].next;
 104         }
 105         return NULL;
 106 }
 107
 108 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
 109 {
 110         struct ct_iter_state *st = seq->private;
 111
 112         head = head->next;
 113         while (head == &nf_conntrack_hash[st->bucket]) {
 114                 if (++st->bucket >= nf_conntrack_htable_size)
 115                         return NULL;
 116                 head = nf_conntrack_hash[st->bucket].next;
 117         }
 118         return head;
 119 }
 120
 121 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 122 {
 123         struct list_head *head = ct_get_first(seq);
 124
 125         if (head)
 126                 while (pos && (head = ct_get_next(seq, head)))
 127                         pos--;
 128         return pos ? NULL : head;
 129 }
 130
 131 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 132 {
 133         read_lock_bh(&nf_conntrack_lock);
 134         return ct_get_idx(seq, *pos);
 135 }
 136
 137 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 138 {
 139         (*pos)++;
 140         return ct_get_next(s, v);
 141 }
 142
 143 static void ct_seq_stop(struct seq_file *s, void *v)
 144 {
 145         read_unlock_bh(&nf_conntrack_lock);
 146 }
 147
 148 /* return 0 on success, 1 in case of error */
 149 static int ct_seq_show(struct seq_file *s, void *v)
 150 {
 151         const struct nf_conntrack_tuple_hash *hash = v;
 152         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 153         struct nf_conntrack_l3proto *l3proto;
 154         struct nf_conntrack_protocol *proto;
 155
 156         ASSERT_READ_LOCK(&nf_conntrack_lock);
 157         NF_CT_ASSERT(conntrack);
 158
 159         /* we only want to print DIR_ORIGINAL */
 160         if (NF_CT_DIRECTION(hash))
 161                 return 0;
 162
 163         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 164                                        .tuple.src.l3num);
 165
 166         NF_CT_ASSERT(l3proto);
 167         proto = __nf_ct_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 168                                    .tuple.src.l3num,
 169                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 170                                    .tuple.dst.protonum);
 171         NF_CT_ASSERT(proto);
 172
 173         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 174                        l3proto->name,
 175                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 176                        proto->name,
 177                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 178                        timer_pending(&conntrack->timeout)
 179                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 180                 return -ENOSPC;
 181
 182         if (l3proto->print_conntrack(s, conntrack))
 183                 return -ENOSPC;
 184
 185         if (proto->print_conntrack(s, conntrack))
 186                 return -ENOSPC;
 187
 188         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 189                         l3proto, proto))
 190                 return -ENOSPC;
 191
 192         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 193                 return -ENOSPC;
 194
 195         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 196                 if (seq_printf(s, "[UNREPLIED] "))
 197                         return -ENOSPC;
 198
 199         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 200                         l3proto, proto))
 201                 return -ENOSPC;
 202
 203         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 204                 return -ENOSPC;
 205
 206         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 207                 if (seq_printf(s, "[ASSURED] "))
 208                         return -ENOSPC;
 209
 210 #if defined(CONFIG_NF_CONNTRACK_MARK)
 211         if (seq_printf(s, "mark=%u ", conntrack->mark))
 212                 return -ENOSPC;
 213 #endif
 214
 215 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 216         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 217                 return -ENOSPC;
 218 #endif
 219
 220         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 221                 return -ENOSPC;
 222
 223         return 0;
 224 }
 225
 226 static struct seq_operations ct_seq_ops = {
 227         .start = ct_seq_start,
 228         .next  = ct_seq_next,
 229         .stop  = ct_seq_stop,
 230         .show  = ct_seq_show
 231 };
 232
 233 static int ct_open(struct inode *inode, struct file *file)
 234 {
 235         struct seq_file *seq;
 236         struct ct_iter_state *st;
 237         int ret;
 238
 239         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 240         if (st == NULL)
 241                 return -ENOMEM;
 242         ret = seq_open(file, &ct_seq_ops);
 243         if (ret)
 244                 goto out_free;
 245         seq          = file->private_data;
 246         seq->private = st;
 247         memset(st, 0, sizeof(struct ct_iter_state));
 248         return ret;
 249 out_free:
 250         kfree(st);
 251         return ret;
 252 }
 253
 254 static struct file_operations ct_file_ops = {
 255         .owner   = THIS_MODULE,
 256         .open    = ct_open,
 257         .read    = seq_read,
 258         .llseek  = seq_lseek,
 259         .release = seq_release_private,
 260 };
 261
 262 /* expects */
 263 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 264 {
 265         struct list_head *e = &nf_conntrack_expect_list;
 266         loff_t i;
 267
 268         /* strange seq_file api calls stop even if we fail,
 269          * thus we need to grab lock since stop unlocks */
 270         read_lock_bh(&nf_conntrack_lock);
 271
 272         if (list_empty(e))
 273                 return NULL;
 274
 275         for (i = 0; i <= *pos; i++) {
 276                 e = e->next;
 277                 if (e == &nf_conntrack_expect_list)
 278                         return NULL;
 279         }
 280         return e;
 281 }
 282
 283 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 284 {
 285         struct list_head *e = v;
 286
 287         ++*pos;
 288         e = e->next;
 289
 290         if (e == &nf_conntrack_expect_list)
 291                 return NULL;
 292
 293         return e;
 294 }
 295
 296 static void exp_seq_stop(struct seq_file *s, void *v)
 297 {
 298         read_unlock_bh(&nf_conntrack_lock);
 299 }
 300
 301 static int exp_seq_show(struct seq_file *s, void *v)
 302 {
 303         struct nf_conntrack_expect *expect = v;
 304
 305         if (expect->timeout.function)
 306                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 307                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 308         else
 309                 seq_printf(s, "- ");
 310         seq_printf(s, "l3proto = %u proto=%u ",
 311                    expect->tuple.src.l3num,
 312                    expect->tuple.dst.protonum);
 313         print_tuple(s, &expect->tuple,
 314                     __nf_ct_l3proto_find(expect->tuple.src.l3num),
 315                     __nf_ct_proto_find(expect->tuple.src.l3num,
 316                                        expect->tuple.dst.protonum));
 317         return seq_putc(s, '\n');
 318 }
 319
 320 static struct seq_operations exp_seq_ops = {
 321         .start = exp_seq_start,
 322         .next = exp_seq_next,
 323         .stop = exp_seq_stop,
 324         .show = exp_seq_show
 325 };
 326
 327 static int exp_open(struct inode *inode, struct file *file)
 328 {
 329         return seq_open(file, &exp_seq_ops);
 330 }
 331
 332 static struct file_operations exp_file_ops = {
 333         .owner   = THIS_MODULE,
 334         .open    = exp_open,
 335         .read    = seq_read,
 336         .llseek  = seq_lseek,
 337         .release = seq_release
 338 };
 339
 340 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 341 {
 342         int cpu;
 343
 344         if (*pos == 0)
 345                 return SEQ_START_TOKEN;
 346
 347         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 348                 if (!cpu_possible(cpu))
 349                         continue;
 350                 *pos = cpu + 1;
 351                 return &per_cpu(nf_conntrack_stat, cpu);
 352         }
 353
 354         return NULL;
 355 }
 356
 357 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 358 {
 359         int cpu;
 360
 361         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 362                 if (!cpu_possible(cpu))
 363                         continue;
 364                 *pos = cpu + 1;
 365                 return &per_cpu(nf_conntrack_stat, cpu);
 366         }
 367
 368         return NULL;
 369 }
 370
 371 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 372 {
 373 }
 374
 375 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 376 {
 377         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 378         struct ip_conntrack_stat *st = v;
 379
 380         if (v == SEQ_START_TOKEN) {
 381                 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");
 382                 return 0;
 383         }
 384
 385         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 386                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 387                    nr_conntracks,
 388                    st->searched,
 389                    st->found,
 390                    st->new,
 391                    st->invalid,
 392                    st->ignore,
 393                    st->delete,
 394                    st->delete_list,
 395                    st->insert,
 396                    st->insert_failed,
 397                    st->drop,
 398                    st->early_drop,
 399                    st->error,
 400
 401                    st->expect_new,
 402                    st->expect_create,
 403                    st->expect_delete
 404                 );
 405         return 0;
 406 }
 407
 408 static struct seq_operations ct_cpu_seq_ops = {
 409         .start  = ct_cpu_seq_start,
 410         .next   = ct_cpu_seq_next,
 411         .stop   = ct_cpu_seq_stop,
 412         .show   = ct_cpu_seq_show,
 413 };
 414
 415 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 416 {
 417         return seq_open(file, &ct_cpu_seq_ops);
 418 }
 419
 420 static struct file_operations ct_cpu_seq_fops = {
 421         .owner   = THIS_MODULE,
 422         .open    = ct_cpu_seq_open,
 423         .read    = seq_read,
 424         .llseek  = seq_lseek,
 425         .release = seq_release_private,
 426 };
 427 #endif /* CONFIG_PROC_FS */
 428
 429 /* Sysctl support */
 430
 431 int nf_conntrack_checksum = 1;
 432
 433 #ifdef CONFIG_SYSCTL
 434
 435 /* From nf_conntrack_core.c */
 436 extern int nf_conntrack_max;
 437 extern unsigned int nf_conntrack_htable_size;
 438
 439 /* From nf_conntrack_proto_tcp.c */
 440 extern unsigned int nf_ct_tcp_timeout_syn_sent;
 441 extern unsigned int nf_ct_tcp_timeout_syn_recv;
 442 extern unsigned int nf_ct_tcp_timeout_established;
 443 extern unsigned int nf_ct_tcp_timeout_fin_wait;
 444 extern unsigned int nf_ct_tcp_timeout_close_wait;
 445 extern unsigned int nf_ct_tcp_timeout_last_ack;
 446 extern unsigned int nf_ct_tcp_timeout_time_wait;
 447 extern unsigned int nf_ct_tcp_timeout_close;
 448 extern unsigned int nf_ct_tcp_timeout_max_retrans;
 449 extern int nf_ct_tcp_loose;
 450 extern int nf_ct_tcp_be_liberal;
 451 extern int nf_ct_tcp_max_retrans;
 452
 453 /* From nf_conntrack_proto_udp.c */
 454 extern unsigned int nf_ct_udp_timeout;
 455 extern unsigned int nf_ct_udp_timeout_stream;
 456
 457 /* From nf_conntrack_proto_generic.c */
 458 extern unsigned int nf_ct_generic_timeout;
 459
 460 /* Log invalid packets of a given protocol */
 461 static int log_invalid_proto_min = 0;
 462 static int log_invalid_proto_max = 255;
 463
 464 static struct ctl_table_header *nf_ct_sysctl_header;
 465
 466 static ctl_table nf_ct_sysctl_table[] = {
 467         {
 468                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 469                 .procname       = "nf_conntrack_max",
 470                 .data           = &nf_conntrack_max,
 471                 .maxlen         = sizeof(int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dointvec,
 474         },
 475         {
 476                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 477                 .procname       = "nf_conntrack_count",
 478                 .data           = &nf_conntrack_count,
 479                 .maxlen         = sizeof(int),
 480                 .mode           = 0444,
 481                 .proc_handler   = &proc_dointvec,
 482         },
 483         {
 484                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 485                 .procname       = "nf_conntrack_buckets",
 486                 .data           = &nf_conntrack_htable_size,
 487                 .maxlen         = sizeof(unsigned int),
 488                 .mode           = 0444,
 489                 .proc_handler   = &proc_dointvec,
 490         },
 491         {
 492                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 493                 .procname       = "nf_conntrack_checksum",
 494                 .data           = &nf_conntrack_checksum,
 495                 .maxlen         = sizeof(unsigned int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec,
 498         },
 499         {
 500                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 501                 .procname       = "nf_conntrack_tcp_timeout_syn_sent",
 502                 .data           = &nf_ct_tcp_timeout_syn_sent,
 503                 .maxlen         = sizeof(unsigned int),
 504                 .mode           = 0644,
 505                 .proc_handler   = &proc_dointvec_jiffies,
 506         },
 507         {
 508                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 509                 .procname       = "nf_conntrack_tcp_timeout_syn_recv",
 510                 .data           = &nf_ct_tcp_timeout_syn_recv,
 511                 .maxlen         = sizeof(unsigned int),
 512                 .mode           = 0644,
 513                 .proc_handler   = &proc_dointvec_jiffies,
 514         },
 515         {
 516                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 517                 .procname       = "nf_conntrack_tcp_timeout_established",
 518                 .data           = &nf_ct_tcp_timeout_established,
 519                 .maxlen         = sizeof(unsigned int),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec_jiffies,
 522         },
 523         {
 524                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 525                 .procname       = "nf_conntrack_tcp_timeout_fin_wait",
 526                 .data           = &nf_ct_tcp_timeout_fin_wait,
 527                 .maxlen         = sizeof(unsigned int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec_jiffies,
 530         },
 531         {
 532                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 533                 .procname       = "nf_conntrack_tcp_timeout_close_wait",
 534                 .data           = &nf_ct_tcp_timeout_close_wait,
 535                 .maxlen         = sizeof(unsigned int),
 536                 .mode           = 0644,
 537                 .proc_handler   = &proc_dointvec_jiffies,
 538         },
 539         {
 540                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 541                 .procname       = "nf_conntrack_tcp_timeout_last_ack",
 542                 .data           = &nf_ct_tcp_timeout_last_ack,
 543                 .maxlen         = sizeof(unsigned int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec_jiffies,
 546         },
 547         {
 548                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 549                 .procname       = "nf_conntrack_tcp_timeout_time_wait",
 550                 .data           = &nf_ct_tcp_timeout_time_wait,
 551                 .maxlen         = sizeof(unsigned int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_jiffies,
 554         },
 555         {
 556                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 557                 .procname       = "nf_conntrack_tcp_timeout_close",
 558                 .data           = &nf_ct_tcp_timeout_close,
 559                 .maxlen         = sizeof(unsigned int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_jiffies,
 562         },
 563         {
 564                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT,
 565                 .procname       = "nf_conntrack_udp_timeout",
 566                 .data           = &nf_ct_udp_timeout,
 567                 .maxlen         = sizeof(unsigned int),
 568                 .mode           = 0644,
 569                 .proc_handler   = &proc_dointvec_jiffies,
 570         },
 571         {
 572                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 573                 .procname       = "nf_conntrack_udp_timeout_stream",
 574                 .data           = &nf_ct_udp_timeout_stream,
 575                 .maxlen         = sizeof(unsigned int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_jiffies,
 578         },
 579         {
 580                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
 581                 .procname       = "nf_conntrack_generic_timeout",
 582                 .data           = &nf_ct_generic_timeout,
 583                 .maxlen         = sizeof(unsigned int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_jiffies,
 586         },
 587         {
 588                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 589                 .procname       = "nf_conntrack_log_invalid",
 590                 .data           = &nf_ct_log_invalid,
 591                 .maxlen         = sizeof(unsigned int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_minmax,
 594                 .strategy       = &sysctl_intvec,
 595                 .extra1         = &log_invalid_proto_min,
 596                 .extra2         = &log_invalid_proto_max,
 597         },
 598         {
 599                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 600                 .procname       = "nf_conntrack_tcp_timeout_max_retrans",
 601                 .data           = &nf_ct_tcp_timeout_max_retrans,
 602                 .maxlen         = sizeof(unsigned int),
 603                 .mode           = 0644,
 604                 .proc_handler   = &proc_dointvec_jiffies,
 605         },
 606         {
 607                 .ctl_name       = NET_NF_CONNTRACK_TCP_LOOSE,
 608                 .procname       = "nf_conntrack_tcp_loose",
 609                 .data           = &nf_ct_tcp_loose,
 610                 .maxlen         = sizeof(unsigned int),
 611                 .mode           = 0644,
 612                 .proc_handler   = &proc_dointvec,
 613         },
 614         {
 615                 .ctl_name       = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
 616                 .procname       = "nf_conntrack_tcp_be_liberal",
 617                 .data           = &nf_ct_tcp_be_liberal,
 618                 .maxlen         = sizeof(unsigned int),
 619                 .mode           = 0644,
 620                 .proc_handler   = &proc_dointvec,
 621         },
 622         {
 623                 .ctl_name       = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
 624                 .procname       = "nf_conntrack_tcp_max_retrans",
 625                 .data           = &nf_ct_tcp_max_retrans,
 626                 .maxlen         = sizeof(unsigned int),
 627                 .mode           = 0644,
 628                 .proc_handler   = &proc_dointvec,
 629         },
 630
 631         { .ctl_name = 0 }
 632 };
 633
 634 #define NET_NF_CONNTRACK_MAX 2089
 635
 636 static ctl_table nf_ct_netfilter_table[] = {
 637         {
 638                 .ctl_name       = NET_NETFILTER,
 639                 .procname       = "netfilter",
 640                 .mode           = 0555,
 641                 .child          = nf_ct_sysctl_table,
 642         },
 643         {
 644                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 645                 .procname       = "nf_conntrack_max",
 646                 .data           = &nf_conntrack_max,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651         { .ctl_name = 0 }
 652 };
 653
 654 static ctl_table nf_ct_net_table[] = {
 655         {
 656                 .ctl_name       = CTL_NET,
 657                 .procname       = "net",
 658                 .mode           = 0555,
 659                 .child          = nf_ct_netfilter_table,
 660         },
 661         { .ctl_name = 0 }
 662 };
 663 EXPORT_SYMBOL(nf_ct_log_invalid);
 664 #endif /* CONFIG_SYSCTL */
 665
 666 int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
 667 {
 668         int ret = 0;
 669
 670         write_lock_bh(&nf_conntrack_lock);
 671         if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
 672                 ret = -EBUSY;
 673                 goto out;
 674         }
 675         nf_ct_l3protos[proto->l3proto] = proto;
 676 out:
 677         write_unlock_bh(&nf_conntrack_lock);
 678
 679         return ret;
 680 }
 681
 682 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 683 {
 684         write_lock_bh(&nf_conntrack_lock);
 685         nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
 686         write_unlock_bh(&nf_conntrack_lock);
 687
 688         /* Somebody could be still looking at the proto in bh. */
 689         synchronize_net();
 690
 691         /* Remove all contrack entries for this protocol */
 692         nf_ct_iterate_cleanup(kill_l3proto, proto);
 693 }
 694
 695 /* FIXME: Allow NULL functions and sub in pointers to generic for
 696    them. --RR */
 697 int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
 698 {
 699         int ret = 0;
 700
 701 retry:
 702         write_lock_bh(&nf_conntrack_lock);
 703         if (nf_ct_protos[proto->l3proto]) {
 704                 if (nf_ct_protos[proto->l3proto][proto->proto]
 705                                 != &nf_conntrack_generic_protocol) {
 706                         ret = -EBUSY;
 707                         goto out_unlock;
 708                 }
 709         } else {
 710                 /* l3proto may be loaded latter. */
 711                 struct nf_conntrack_protocol **proto_array;
 712                 int i;
 713
 714                 write_unlock_bh(&nf_conntrack_lock);
 715
 716                 proto_array = (struct nf_conntrack_protocol **)
 717                                 kmalloc(MAX_NF_CT_PROTO *
 718                                          sizeof(struct nf_conntrack_protocol *),
 719                                         GFP_KERNEL);
 720                 if (proto_array == NULL) {
 721                         ret = -ENOMEM;
 722                         goto out;
 723                 }
 724                 for (i = 0; i < MAX_NF_CT_PROTO; i++)
 725                         proto_array[i] = &nf_conntrack_generic_protocol;
 726
 727                 write_lock_bh(&nf_conntrack_lock);
 728                 if (nf_ct_protos[proto->l3proto]) {
 729                         /* bad timing, but no problem */
 730                         write_unlock_bh(&nf_conntrack_lock);
 731                         kfree(proto_array);
 732                 } else {
 733                         nf_ct_protos[proto->l3proto] = proto_array;
 734                         write_unlock_bh(&nf_conntrack_lock);
 735                 }
 736
 737                 /*
 738                  * Just once because array is never freed until unloading
 739                  * nf_conntrack.ko
 740                  */
 741                 goto retry;
 742         }
 743
 744         nf_ct_protos[proto->l3proto][proto->proto] = proto;
 745
 746 out_unlock:
 747         write_unlock_bh(&nf_conntrack_lock);
 748 out:
 749         return ret;
 750 }
 751
 752 void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
 753 {
 754         write_lock_bh(&nf_conntrack_lock);
 755         nf_ct_protos[proto->l3proto][proto->proto]
 756                 = &nf_conntrack_generic_protocol;
 757         write_unlock_bh(&nf_conntrack_lock);
 758
 759         /* Somebody could be still looking at the proto in bh. */
 760         synchronize_net();
 761
 762         /* Remove all contrack entries for this protocol */
 763         nf_ct_iterate_cleanup(kill_proto, proto);
 764 }
 765
 766 static int __init nf_conntrack_standalone_init(void)
 767 {
 768 #ifdef CONFIG_PROC_FS
 769         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 770 #endif
 771         int ret = 0;
 772
 773         ret = nf_conntrack_init();
 774         if (ret < 0)
 775                 return ret;
 776
 777 #ifdef CONFIG_PROC_FS
 778         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 779         if (!proc) goto cleanup_init;
 780
 781         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 782                                         &exp_file_ops);
 783         if (!proc_exp) goto cleanup_proc;
 784
 785         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 786         if (!proc_stat)
 787                 goto cleanup_proc_exp;
 788
 789         proc_stat->proc_fops = &ct_cpu_seq_fops;
 790         proc_stat->owner = THIS_MODULE;
 791 #endif
 792 #ifdef CONFIG_SYSCTL
 793         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 794         if (nf_ct_sysctl_header == NULL) {
 795                 printk("nf_conntrack: can't register to sysctl.\n");
 796                 ret = -ENOMEM;
 797                 goto cleanup_proc_stat;
 798         }
 799 #endif
 800         return ret;
 801
 802 #ifdef CONFIG_SYSCTL
 803  cleanup_proc_stat:
 804 #endif
 805 #ifdef CONFIG_PROC_FS
 806         remove_proc_entry("nf_conntrack", proc_net_stat);
 807  cleanup_proc_exp:
 808         proc_net_remove("nf_conntrack_expect");
 809  cleanup_proc:
 810         proc_net_remove("nf_conntrack");
 811  cleanup_init:
 812 #endif /* CNFIG_PROC_FS */
 813         nf_conntrack_cleanup();
 814         return ret;
 815 }
 816
 817 static void __exit nf_conntrack_standalone_fini(void)
 818 {
 819 #ifdef CONFIG_SYSCTL
 820         unregister_sysctl_table(nf_ct_sysctl_header);
 821 #endif
 822 #ifdef CONFIG_PROC_FS
 823         remove_proc_entry("nf_conntrack", proc_net_stat);
 824         proc_net_remove("nf_conntrack_expect");
 825         proc_net_remove("nf_conntrack");
 826 #endif /* CNFIG_PROC_FS */
 827         nf_conntrack_cleanup();
 828 }
 829
 830 module_init(nf_conntrack_standalone_init);
 831 module_exit(nf_conntrack_standalone_fini);
 832
 833 /* Some modules need us, but don't depend directly on any symbol.
 834    They should call this. */
 835 void need_conntrack(void)
 836 {
 837 }
 838
 839 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 840 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 841 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 842 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 843 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 844 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 845 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 846 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 847 #endif
 848 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
 849 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
 850 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 851 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 852 EXPORT_SYMBOL(nf_conntrack_protocol_register);
 853 EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
 854 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 855 EXPORT_SYMBOL(nf_conntrack_destroyed);
 856 EXPORT_SYMBOL(need_conntrack);
 857 EXPORT_SYMBOL(nf_conntrack_helper_register);
 858 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 859 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 860 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 861 EXPORT_SYMBOL(nf_ct_protos);
 862 EXPORT_SYMBOL(__nf_ct_proto_find);
 863 EXPORT_SYMBOL(nf_ct_proto_find_get);
 864 EXPORT_SYMBOL(nf_ct_proto_put);
 865 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 866 EXPORT_SYMBOL(nf_ct_l3proto_put);
 867 EXPORT_SYMBOL(nf_ct_l3protos);
 868 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 869 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 870 EXPORT_SYMBOL(nf_conntrack_expect_put);
 871 EXPORT_SYMBOL(nf_conntrack_expect_related);
 872 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 873 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 874 EXPORT_SYMBOL(nf_conntrack_htable_size);
 875 EXPORT_SYMBOL(nf_conntrack_lock);
 876 EXPORT_SYMBOL(nf_conntrack_hash);
 877 EXPORT_SYMBOL(nf_conntrack_untracked);
 878 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 879 #ifdef CONFIG_IP_NF_NAT_NEEDED
 880 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 881 #endif
 882 EXPORT_SYMBOL(__nf_conntrack_confirm);
 883 EXPORT_SYMBOL(nf_ct_get_tuple);
 884 EXPORT_SYMBOL(nf_ct_invert_tuple);
 885 EXPORT_SYMBOL(nf_conntrack_in);
 886 EXPORT_SYMBOL(__nf_conntrack_attach);
 887 EXPORT_SYMBOL(nf_conntrack_alloc);
 888 EXPORT_SYMBOL(nf_conntrack_free);
 889 EXPORT_SYMBOL(nf_conntrack_flush);
 890 EXPORT_SYMBOL(nf_ct_remove_expectations);
 891 EXPORT_SYMBOL(nf_ct_helper_find_get);
 892 EXPORT_SYMBOL(nf_ct_helper_put);
 893 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 894 EXPORT_SYMBOL(__nf_conntrack_find);
 895 EXPORT_SYMBOL(nf_ct_unlink_expect);
 896 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 897 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 898 EXPORT_SYMBOL(nf_conntrack_expect_find);
 899 EXPORT_SYMBOL(nf_conntrack_expect_list);
 900 #if defined(CONFIG_NF_CT_NETLINK) || \
 901     defined(CONFIG_NF_CT_NETLINK_MODULE)
 902 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 903 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 904 #endif