err.no Git - linux-2.6/blob - 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_core.h>
  37 #include <net/netfilter/nf_conntrack_l3proto.h>
  38 #include <net/netfilter/nf_conntrack_protocol.h>
  39 #include <net/netfilter/nf_conntrack_expect.h>
  40 #include <net/netfilter/nf_conntrack_helper.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 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 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 263 {
 264         int cpu;
 265
 266         if (*pos == 0)
 267                 return SEQ_START_TOKEN;
 268
 269         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 270                 if (!cpu_possible(cpu))
 271                         continue;
 272                 *pos = cpu + 1;
 273                 return &per_cpu(nf_conntrack_stat, cpu);
 274         }
 275
 276         return NULL;
 277 }
 278
 279 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 280 {
 281         int cpu;
 282
 283         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 284                 if (!cpu_possible(cpu))
 285                         continue;
 286                 *pos = cpu + 1;
 287                 return &per_cpu(nf_conntrack_stat, cpu);
 288         }
 289
 290         return NULL;
 291 }
 292
 293 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 294 {
 295 }
 296
 297 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 298 {
 299         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 300         struct ip_conntrack_stat *st = v;
 301
 302         if (v == SEQ_START_TOKEN) {
 303                 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");
 304                 return 0;
 305         }
 306
 307         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 308                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 309                    nr_conntracks,
 310                    st->searched,
 311                    st->found,
 312                    st->new,
 313                    st->invalid,
 314                    st->ignore,
 315                    st->delete,
 316                    st->delete_list,
 317                    st->insert,
 318                    st->insert_failed,
 319                    st->drop,
 320                    st->early_drop,
 321                    st->error,
 322
 323                    st->expect_new,
 324                    st->expect_create,
 325                    st->expect_delete
 326                 );
 327         return 0;
 328 }
 329
 330 static struct seq_operations ct_cpu_seq_ops = {
 331         .start  = ct_cpu_seq_start,
 332         .next   = ct_cpu_seq_next,
 333         .stop   = ct_cpu_seq_stop,
 334         .show   = ct_cpu_seq_show,
 335 };
 336
 337 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 338 {
 339         return seq_open(file, &ct_cpu_seq_ops);
 340 }
 341
 342 static struct file_operations ct_cpu_seq_fops = {
 343         .owner   = THIS_MODULE,
 344         .open    = ct_cpu_seq_open,
 345         .read    = seq_read,
 346         .llseek  = seq_lseek,
 347         .release = seq_release_private,
 348 };
 349 #endif /* CONFIG_PROC_FS */
 350
 351 /* Sysctl support */
 352
 353 int nf_conntrack_checksum __read_mostly = 1;
 354
 355 #ifdef CONFIG_SYSCTL
 356
 357 /* From nf_conntrack_core.c */
 358 extern int nf_conntrack_max;
 359 extern unsigned int nf_conntrack_htable_size;
 360
 361 /* From nf_conntrack_proto_tcp.c */
 362 extern unsigned int nf_ct_tcp_timeout_syn_sent;
 363 extern unsigned int nf_ct_tcp_timeout_syn_recv;
 364 extern unsigned int nf_ct_tcp_timeout_established;
 365 extern unsigned int nf_ct_tcp_timeout_fin_wait;
 366 extern unsigned int nf_ct_tcp_timeout_close_wait;
 367 extern unsigned int nf_ct_tcp_timeout_last_ack;
 368 extern unsigned int nf_ct_tcp_timeout_time_wait;
 369 extern unsigned int nf_ct_tcp_timeout_close;
 370 extern unsigned int nf_ct_tcp_timeout_max_retrans;
 371 extern int nf_ct_tcp_loose;
 372 extern int nf_ct_tcp_be_liberal;
 373 extern int nf_ct_tcp_max_retrans;
 374
 375 /* From nf_conntrack_proto_udp.c */
 376 extern unsigned int nf_ct_udp_timeout;
 377 extern unsigned int nf_ct_udp_timeout_stream;
 378
 379 /* From nf_conntrack_proto_generic.c */
 380 extern unsigned int nf_ct_generic_timeout;
 381
 382 /* Log invalid packets of a given protocol */
 383 static int log_invalid_proto_min = 0;
 384 static int log_invalid_proto_max = 255;
 385
 386 static struct ctl_table_header *nf_ct_sysctl_header;
 387
 388 static ctl_table nf_ct_sysctl_table[] = {
 389         {
 390                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 391                 .procname       = "nf_conntrack_max",
 392                 .data           = &nf_conntrack_max,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397         {
 398                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 399                 .procname       = "nf_conntrack_count",
 400                 .data           = &nf_conntrack_count,
 401                 .maxlen         = sizeof(int),
 402                 .mode           = 0444,
 403                 .proc_handler   = &proc_dointvec,
 404         },
 405         {
 406                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 407                 .procname       = "nf_conntrack_buckets",
 408                 .data           = &nf_conntrack_htable_size,
 409                 .maxlen         = sizeof(unsigned int),
 410                 .mode           = 0444,
 411                 .proc_handler   = &proc_dointvec,
 412         },
 413         {
 414                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 415                 .procname       = "nf_conntrack_checksum",
 416                 .data           = &nf_conntrack_checksum,
 417                 .maxlen         = sizeof(unsigned int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec,
 420         },
 421         {
 422                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 423                 .procname       = "nf_conntrack_tcp_timeout_syn_sent",
 424                 .data           = &nf_ct_tcp_timeout_syn_sent,
 425                 .maxlen         = sizeof(unsigned int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec_jiffies,
 428         },
 429         {
 430                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 431                 .procname       = "nf_conntrack_tcp_timeout_syn_recv",
 432                 .data           = &nf_ct_tcp_timeout_syn_recv,
 433                 .maxlen         = sizeof(unsigned int),
 434                 .mode           = 0644,
 435                 .proc_handler   = &proc_dointvec_jiffies,
 436         },
 437         {
 438                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 439                 .procname       = "nf_conntrack_tcp_timeout_established",
 440                 .data           = &nf_ct_tcp_timeout_established,
 441                 .maxlen         = sizeof(unsigned int),
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dointvec_jiffies,
 444         },
 445         {
 446                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 447                 .procname       = "nf_conntrack_tcp_timeout_fin_wait",
 448                 .data           = &nf_ct_tcp_timeout_fin_wait,
 449                 .maxlen         = sizeof(unsigned int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec_jiffies,
 452         },
 453         {
 454                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 455                 .procname       = "nf_conntrack_tcp_timeout_close_wait",
 456                 .data           = &nf_ct_tcp_timeout_close_wait,
 457                 .maxlen         = sizeof(unsigned int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec_jiffies,
 460         },
 461         {
 462                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 463                 .procname       = "nf_conntrack_tcp_timeout_last_ack",
 464                 .data           = &nf_ct_tcp_timeout_last_ack,
 465                 .maxlen         = sizeof(unsigned int),
 466                 .mode           = 0644,
 467                 .proc_handler   = &proc_dointvec_jiffies,
 468         },
 469         {
 470                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 471                 .procname       = "nf_conntrack_tcp_timeout_time_wait",
 472                 .data           = &nf_ct_tcp_timeout_time_wait,
 473                 .maxlen         = sizeof(unsigned int),
 474                 .mode           = 0644,
 475                 .proc_handler   = &proc_dointvec_jiffies,
 476         },
 477         {
 478                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 479                 .procname       = "nf_conntrack_tcp_timeout_close",
 480                 .data           = &nf_ct_tcp_timeout_close,
 481                 .maxlen         = sizeof(unsigned int),
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dointvec_jiffies,
 484         },
 485         {
 486                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT,
 487                 .procname       = "nf_conntrack_udp_timeout",
 488                 .data           = &nf_ct_udp_timeout,
 489                 .maxlen         = sizeof(unsigned int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec_jiffies,
 492         },
 493         {
 494                 .ctl_name       = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 495                 .procname       = "nf_conntrack_udp_timeout_stream",
 496                 .data           = &nf_ct_udp_timeout_stream,
 497                 .maxlen         = sizeof(unsigned int),
 498                 .mode           = 0644,
 499                 .proc_handler   = &proc_dointvec_jiffies,
 500         },
 501         {
 502                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
 503                 .procname       = "nf_conntrack_generic_timeout",
 504                 .data           = &nf_ct_generic_timeout,
 505                 .maxlen         = sizeof(unsigned int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec_jiffies,
 508         },
 509         {
 510                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 511                 .procname       = "nf_conntrack_log_invalid",
 512                 .data           = &nf_ct_log_invalid,
 513                 .maxlen         = sizeof(unsigned int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec_minmax,
 516                 .strategy       = &sysctl_intvec,
 517                 .extra1         = &log_invalid_proto_min,
 518                 .extra2         = &log_invalid_proto_max,
 519         },
 520         {
 521                 .ctl_name       = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 522                 .procname       = "nf_conntrack_tcp_timeout_max_retrans",
 523                 .data           = &nf_ct_tcp_timeout_max_retrans,
 524                 .maxlen         = sizeof(unsigned int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_dointvec_jiffies,
 527         },
 528         {
 529                 .ctl_name       = NET_NF_CONNTRACK_TCP_LOOSE,
 530                 .procname       = "nf_conntrack_tcp_loose",
 531                 .data           = &nf_ct_tcp_loose,
 532                 .maxlen         = sizeof(unsigned int),
 533                 .mode           = 0644,
 534                 .proc_handler   = &proc_dointvec,
 535         },
 536         {
 537                 .ctl_name       = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
 538                 .procname       = "nf_conntrack_tcp_be_liberal",
 539                 .data           = &nf_ct_tcp_be_liberal,
 540                 .maxlen         = sizeof(unsigned int),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec,
 543         },
 544         {
 545                 .ctl_name       = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
 546                 .procname       = "nf_conntrack_tcp_max_retrans",
 547                 .data           = &nf_ct_tcp_max_retrans,
 548                 .maxlen         = sizeof(unsigned int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec,
 551         },
 552
 553         { .ctl_name = 0 }
 554 };
 555
 556 #define NET_NF_CONNTRACK_MAX 2089
 557
 558 static ctl_table nf_ct_netfilter_table[] = {
 559         {
 560                 .ctl_name       = NET_NETFILTER,
 561                 .procname       = "netfilter",
 562                 .mode           = 0555,
 563                 .child          = nf_ct_sysctl_table,
 564         },
 565         {
 566                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 567                 .procname       = "nf_conntrack_max",
 568                 .data           = &nf_conntrack_max,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec,
 572         },
 573         { .ctl_name = 0 }
 574 };
 575
 576 static ctl_table nf_ct_net_table[] = {
 577         {
 578                 .ctl_name       = CTL_NET,
 579                 .procname       = "net",
 580                 .mode           = 0555,
 581                 .child          = nf_ct_netfilter_table,
 582         },
 583         { .ctl_name = 0 }
 584 };
 585 EXPORT_SYMBOL(nf_ct_log_invalid);
 586 #endif /* CONFIG_SYSCTL */
 587
 588 int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
 589 {
 590         int ret = 0;
 591
 592         write_lock_bh(&nf_conntrack_lock);
 593         if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
 594                 ret = -EBUSY;
 595                 goto out;
 596         }
 597         nf_ct_l3protos[proto->l3proto] = proto;
 598 out:
 599         write_unlock_bh(&nf_conntrack_lock);
 600
 601         return ret;
 602 }
 603
 604 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 605 {
 606         write_lock_bh(&nf_conntrack_lock);
 607         nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
 608         write_unlock_bh(&nf_conntrack_lock);
 609
 610         /* Somebody could be still looking at the proto in bh. */
 611         synchronize_net();
 612
 613         /* Remove all contrack entries for this protocol */
 614         nf_ct_iterate_cleanup(kill_l3proto, proto);
 615 }
 616
 617 /* FIXME: Allow NULL functions and sub in pointers to generic for
 618    them. --RR */
 619 int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
 620 {
 621         int ret = 0;
 622
 623 retry:
 624         write_lock_bh(&nf_conntrack_lock);
 625         if (nf_ct_protos[proto->l3proto]) {
 626                 if (nf_ct_protos[proto->l3proto][proto->proto]
 627                                 != &nf_conntrack_generic_protocol) {
 628                         ret = -EBUSY;
 629                         goto out_unlock;
 630                 }
 631         } else {
 632                 /* l3proto may be loaded latter. */
 633                 struct nf_conntrack_protocol **proto_array;
 634                 int i;
 635
 636                 write_unlock_bh(&nf_conntrack_lock);
 637
 638                 proto_array = (struct nf_conntrack_protocol **)
 639                                 kmalloc(MAX_NF_CT_PROTO *
 640                                          sizeof(struct nf_conntrack_protocol *),
 641                                         GFP_KERNEL);
 642                 if (proto_array == NULL) {
 643                         ret = -ENOMEM;
 644                         goto out;
 645                 }
 646                 for (i = 0; i < MAX_NF_CT_PROTO; i++)
 647                         proto_array[i] = &nf_conntrack_generic_protocol;
 648
 649                 write_lock_bh(&nf_conntrack_lock);
 650                 if (nf_ct_protos[proto->l3proto]) {
 651                         /* bad timing, but no problem */
 652                         write_unlock_bh(&nf_conntrack_lock);
 653                         kfree(proto_array);
 654                 } else {
 655                         nf_ct_protos[proto->l3proto] = proto_array;
 656                         write_unlock_bh(&nf_conntrack_lock);
 657                 }
 658
 659                 /*
 660                  * Just once because array is never freed until unloading
 661                  * nf_conntrack.ko
 662                  */
 663                 goto retry;
 664         }
 665
 666         nf_ct_protos[proto->l3proto][proto->proto] = proto;
 667
 668 out_unlock:
 669         write_unlock_bh(&nf_conntrack_lock);
 670 out:
 671         return ret;
 672 }
 673
 674 void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
 675 {
 676         write_lock_bh(&nf_conntrack_lock);
 677         nf_ct_protos[proto->l3proto][proto->proto]
 678                 = &nf_conntrack_generic_protocol;
 679         write_unlock_bh(&nf_conntrack_lock);
 680
 681         /* Somebody could be still looking at the proto in bh. */
 682         synchronize_net();
 683
 684         /* Remove all contrack entries for this protocol */
 685         nf_ct_iterate_cleanup(kill_proto, proto);
 686 }
 687
 688 static int __init nf_conntrack_standalone_init(void)
 689 {
 690 #ifdef CONFIG_PROC_FS
 691         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 692 #endif
 693         int ret = 0;
 694
 695         ret = nf_conntrack_init();
 696         if (ret < 0)
 697                 return ret;
 698
 699 #ifdef CONFIG_PROC_FS
 700         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 701         if (!proc) goto cleanup_init;
 702
 703         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 704                                         &exp_file_ops);
 705         if (!proc_exp) goto cleanup_proc;
 706
 707         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 708         if (!proc_stat)
 709                 goto cleanup_proc_exp;
 710
 711         proc_stat->proc_fops = &ct_cpu_seq_fops;
 712         proc_stat->owner = THIS_MODULE;
 713 #endif
 714 #ifdef CONFIG_SYSCTL
 715         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 716         if (nf_ct_sysctl_header == NULL) {
 717                 printk("nf_conntrack: can't register to sysctl.\n");
 718                 ret = -ENOMEM;
 719                 goto cleanup_proc_stat;
 720         }
 721 #endif
 722         return ret;
 723
 724 #ifdef CONFIG_SYSCTL
 725  cleanup_proc_stat:
 726 #endif
 727 #ifdef CONFIG_PROC_FS
 728         remove_proc_entry("nf_conntrack", proc_net_stat);
 729  cleanup_proc_exp:
 730         proc_net_remove("nf_conntrack_expect");
 731  cleanup_proc:
 732         proc_net_remove("nf_conntrack");
 733  cleanup_init:
 734 #endif /* CNFIG_PROC_FS */
 735         nf_conntrack_cleanup();
 736         return ret;
 737 }
 738
 739 static void __exit nf_conntrack_standalone_fini(void)
 740 {
 741 #ifdef CONFIG_SYSCTL
 742         unregister_sysctl_table(nf_ct_sysctl_header);
 743 #endif
 744 #ifdef CONFIG_PROC_FS
 745         remove_proc_entry("nf_conntrack", proc_net_stat);
 746         proc_net_remove("nf_conntrack_expect");
 747         proc_net_remove("nf_conntrack");
 748 #endif /* CNFIG_PROC_FS */
 749         nf_conntrack_cleanup();
 750 }
 751
 752 module_init(nf_conntrack_standalone_init);
 753 module_exit(nf_conntrack_standalone_fini);
 754
 755 /* Some modules need us, but don't depend directly on any symbol.
 756    They should call this. */
 757 void need_conntrack(void)
 758 {
 759 }
 760
 761 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 762 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 763 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 764 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 765 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 766 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 767 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 768 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 769 #endif
 770 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
 771 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
 772 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 773 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 774 EXPORT_SYMBOL(nf_conntrack_protocol_register);
 775 EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
 776 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 777 EXPORT_SYMBOL(nf_conntrack_destroyed);
 778 EXPORT_SYMBOL(need_conntrack);
 779 EXPORT_SYMBOL(nf_conntrack_helper_register);
 780 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 781 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 782 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 783 EXPORT_SYMBOL(nf_ct_protos);
 784 EXPORT_SYMBOL(__nf_ct_proto_find);
 785 EXPORT_SYMBOL(nf_ct_proto_find_get);
 786 EXPORT_SYMBOL(nf_ct_proto_put);
 787 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 788 EXPORT_SYMBOL(nf_ct_l3proto_put);
 789 EXPORT_SYMBOL(nf_ct_l3protos);
 790 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 791 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 792 EXPORT_SYMBOL(nf_conntrack_expect_put);
 793 EXPORT_SYMBOL(nf_conntrack_expect_related);
 794 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 795 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 796 EXPORT_SYMBOL(nf_conntrack_htable_size);
 797 EXPORT_SYMBOL(nf_conntrack_lock);
 798 EXPORT_SYMBOL(nf_conntrack_hash);
 799 EXPORT_SYMBOL(nf_conntrack_untracked);
 800 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 801 #ifdef CONFIG_IP_NF_NAT_NEEDED
 802 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 803 #endif
 804 EXPORT_SYMBOL(__nf_conntrack_confirm);
 805 EXPORT_SYMBOL(nf_ct_get_tuple);
 806 EXPORT_SYMBOL(nf_ct_invert_tuple);
 807 EXPORT_SYMBOL(nf_conntrack_in);
 808 EXPORT_SYMBOL(__nf_conntrack_attach);
 809 EXPORT_SYMBOL(nf_conntrack_alloc);
 810 EXPORT_SYMBOL(nf_conntrack_free);
 811 EXPORT_SYMBOL(nf_conntrack_flush);
 812 EXPORT_SYMBOL(nf_ct_remove_expectations);
 813 EXPORT_SYMBOL(nf_ct_helper_find_get);
 814 EXPORT_SYMBOL(nf_ct_helper_put);
 815 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 816 EXPORT_SYMBOL(__nf_conntrack_find);
 817 EXPORT_SYMBOL(nf_ct_unlink_expect);
 818 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 819 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 820 EXPORT_SYMBOL(nf_conntrack_expect_find);
 821 EXPORT_SYMBOL(nf_conntrack_expect_list);
 822 #if defined(CONFIG_NF_CT_NETLINK) || \
 823     defined(CONFIG_NF_CT_NETLINK_MODULE)
 824 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 825 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 826 #endif