SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv4/netfilter/ip_conntrack_standalone.c

   1 /* This file contains all the functions required for the standalone
   2    ip_conntrack module.
   3
   4    These are not required by the compatibility layer.
   5 */
   6
   7 /* (C) 1999-2001 Paul `Rusty' Russell
   8  * (C) 2002-2005 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
  15 #include <linux/types.h>
  16 #include <linux/ip.h>
  17 #include <linux/netfilter.h>
  18 #include <linux/netfilter_ipv4.h>
  19 #include <linux/module.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/percpu.h>
  24 #ifdef CONFIG_SYSCTL
  25 #include <linux/sysctl.h>
  26 #endif
  27 #include <net/checksum.h>
  28 #include <net/ip.h>
  29 #include <net/route.h>
  30
  31 #define ASSERT_READ_LOCK(x)
  32 #define ASSERT_WRITE_LOCK(x)
  33
  34 #include <linux/netfilter_ipv4/ip_conntrack.h>
  35 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  36 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
  37 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
  38
  39 #if 0
  40 #define DEBUGP printk
  41 #else
  42 #define DEBUGP(format, args...)
  43 #endif
  44
  45 MODULE_LICENSE("GPL");
  46
  47 extern atomic_t ip_conntrack_count;
  48 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  49
  50 static int kill_proto(struct ip_conntrack *i, void *data)
  51 {
  52         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  53                         *((u_int8_t *) data));
  54 }
  55
  56 #ifdef CONFIG_PROC_FS
  57 static int
  58 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  59             struct ip_conntrack_protocol *proto)
  60 {
  61         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  62                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  63         return proto->print_tuple(s, tuple);
  64 }
  65
  66 #ifdef CONFIG_IP_NF_CT_ACCT
  67 static unsigned int
  68 seq_print_counters(struct seq_file *s,
  69                    const struct ip_conntrack_counter *counter)
  70 {
  71         return seq_printf(s, "packets=%llu bytes=%llu ",
  72                           (unsigned long long)counter->packets,
  73                           (unsigned long long)counter->bytes);
  74 }
  75 #else
  76 #define seq_print_counters(x, y)        0
  77 #endif
  78
  79 struct ct_iter_state {
  80         unsigned int bucket;
  81 };
  82
  83 static struct list_head *ct_get_first(struct seq_file *seq)
  84 {
  85         struct ct_iter_state *st = seq->private;
  86
  87         for (st->bucket = 0;
  88              st->bucket < ip_conntrack_htable_size;
  89              st->bucket++) {
  90                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  91                         return ip_conntrack_hash[st->bucket].next;
  92         }
  93         return NULL;
  94 }
  95
  96 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  97 {
  98         struct ct_iter_state *st = seq->private;
  99
 100         head = head->next;
 101         while (head == &ip_conntrack_hash[st->bucket]) {
 102                 if (++st->bucket >= ip_conntrack_htable_size)
 103                         return NULL;
 104                 head = ip_conntrack_hash[st->bucket].next;
 105         }
 106         return head;
 107 }
 108
 109 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 110 {
 111         struct list_head *head = ct_get_first(seq);
 112
 113         if (head)
 114                 while (pos && (head = ct_get_next(seq, head)))
 115                         pos--;
 116         return pos ? NULL : head;
 117 }
 118
 119 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 120 {
 121         read_lock_bh(&ip_conntrack_lock);
 122         return ct_get_idx(seq, *pos);
 123 }
 124
 125 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 126 {
 127         (*pos)++;
 128         return ct_get_next(s, v);
 129 }
 130
 131 static void ct_seq_stop(struct seq_file *s, void *v)
 132 {
 133         read_unlock_bh(&ip_conntrack_lock);
 134 }
 135
 136 static int ct_seq_show(struct seq_file *s, void *v)
 137 {
 138         const struct ip_conntrack_tuple_hash *hash = v;
 139         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 140         struct ip_conntrack_protocol *proto;
 141
 142         ASSERT_READ_LOCK(&ip_conntrack_lock);
 143         IP_NF_ASSERT(conntrack);
 144
 145         /* we only want to print DIR_ORIGINAL */
 146         if (DIRECTION(hash))
 147                 return 0;
 148
 149         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 150         IP_NF_ASSERT(proto);
 151
 152         if (seq_printf(s, "%-8s %u %ld ",
 153                       proto->name,
 154                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 155                       timer_pending(&conntrack->timeout)
 156                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 157                       : 0) != 0)
 158                 return -ENOSPC;
 159
 160         if (proto->print_conntrack(s, conntrack))
 161                 return -ENOSPC;
 162
 163         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 164                         proto))
 165                 return -ENOSPC;
 166
 167         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 168                 return -ENOSPC;
 169
 170         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 171                 if (seq_printf(s, "[UNREPLIED] "))
 172                         return -ENOSPC;
 173
 174         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 175                         proto))
 176                 return -ENOSPC;
 177
 178         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 179                 return -ENOSPC;
 180
 181         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 182                 if (seq_printf(s, "[ASSURED] "))
 183                         return -ENOSPC;
 184
 185 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 186         if (seq_printf(s, "mark=%u ", conntrack->mark))
 187                 return -ENOSPC;
 188 #endif
 189
 190 #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
 191         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 192                 return -ENOSPC;
 193 #endif
 194
 195         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 196                 return -ENOSPC;
 197
 198         return 0;
 199 }
 200
 201 static struct seq_operations ct_seq_ops = {
 202         .start = ct_seq_start,
 203         .next  = ct_seq_next,
 204         .stop  = ct_seq_stop,
 205         .show  = ct_seq_show
 206 };
 207
 208 static int ct_open(struct inode *inode, struct file *file)
 209 {
 210         struct seq_file *seq;
 211         struct ct_iter_state *st;
 212         int ret;
 213
 214         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 215         if (st == NULL)
 216                 return -ENOMEM;
 217         ret = seq_open(file, &ct_seq_ops);
 218         if (ret)
 219                 goto out_free;
 220         seq          = file->private_data;
 221         seq->private = st;
 222         memset(st, 0, sizeof(struct ct_iter_state));
 223         return ret;
 224 out_free:
 225         kfree(st);
 226         return ret;
 227 }
 228
 229 static struct file_operations ct_file_ops = {
 230         .owner   = THIS_MODULE,
 231         .open    = ct_open,
 232         .read    = seq_read,
 233         .llseek  = seq_lseek,
 234         .release = seq_release_private,
 235 };
 236
 237 /* expects */
 238 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 239 {
 240         struct list_head *e = &ip_conntrack_expect_list;
 241         loff_t i;
 242
 243         /* strange seq_file api calls stop even if we fail,
 244          * thus we need to grab lock since stop unlocks */
 245         read_lock_bh(&ip_conntrack_lock);
 246
 247         if (list_empty(e))
 248                 return NULL;
 249
 250         for (i = 0; i <= *pos; i++) {
 251                 e = e->next;
 252                 if (e == &ip_conntrack_expect_list)
 253                         return NULL;
 254         }
 255         return e;
 256 }
 257
 258 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 259 {
 260         struct list_head *e = v;
 261
 262         ++*pos;
 263         e = e->next;
 264
 265         if (e == &ip_conntrack_expect_list)
 266                 return NULL;
 267
 268         return e;
 269 }
 270
 271 static void exp_seq_stop(struct seq_file *s, void *v)
 272 {
 273         read_unlock_bh(&ip_conntrack_lock);
 274 }
 275
 276 static int exp_seq_show(struct seq_file *s, void *v)
 277 {
 278         struct ip_conntrack_expect *expect = v;
 279
 280         if (expect->timeout.function)
 281                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 282                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 283         else
 284                 seq_printf(s, "- ");
 285
 286         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
 287
 288         print_tuple(s, &expect->tuple,
 289                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
 290         return seq_putc(s, '\n');
 291 }
 292
 293 static struct seq_operations exp_seq_ops = {
 294         .start = exp_seq_start,
 295         .next = exp_seq_next,
 296         .stop = exp_seq_stop,
 297         .show = exp_seq_show
 298 };
 299
 300 static int exp_open(struct inode *inode, struct file *file)
 301 {
 302         return seq_open(file, &exp_seq_ops);
 303 }
 304
 305 static struct file_operations exp_file_ops = {
 306         .owner   = THIS_MODULE,
 307         .open    = exp_open,
 308         .read    = seq_read,
 309         .llseek  = seq_lseek,
 310         .release = seq_release
 311 };
 312
 313 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 314 {
 315         int cpu;
 316
 317         if (*pos == 0)
 318                 return SEQ_START_TOKEN;
 319
 320         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 321                 if (!cpu_possible(cpu))
 322                         continue;
 323                 *pos = cpu+1;
 324                 return &per_cpu(ip_conntrack_stat, cpu);
 325         }
 326
 327         return NULL;
 328 }
 329
 330 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 331 {
 332         int cpu;
 333
 334         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 335                 if (!cpu_possible(cpu))
 336                         continue;
 337                 *pos = cpu+1;
 338                 return &per_cpu(ip_conntrack_stat, cpu);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 345 {
 346 }
 347
 348 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 349 {
 350         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
 351         struct ip_conntrack_stat *st = v;
 352
 353         if (v == SEQ_START_TOKEN) {
 354                 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");
 355                 return 0;
 356         }
 357
 358         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 359                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 360                    nr_conntracks,
 361                    st->searched,
 362                    st->found,
 363                    st->new,
 364                    st->invalid,
 365                    st->ignore,
 366                    st->delete,
 367                    st->delete_list,
 368                    st->insert,
 369                    st->insert_failed,
 370                    st->drop,
 371                    st->early_drop,
 372                    st->error,
 373
 374                    st->expect_new,
 375                    st->expect_create,
 376                    st->expect_delete
 377                 );
 378         return 0;
 379 }
 380
 381 static struct seq_operations ct_cpu_seq_ops = {
 382         .start  = ct_cpu_seq_start,
 383         .next   = ct_cpu_seq_next,
 384         .stop   = ct_cpu_seq_stop,
 385         .show   = ct_cpu_seq_show,
 386 };
 387
 388 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 389 {
 390         return seq_open(file, &ct_cpu_seq_ops);
 391 }
 392
 393 static struct file_operations ct_cpu_seq_fops = {
 394         .owner   = THIS_MODULE,
 395         .open    = ct_cpu_seq_open,
 396         .read    = seq_read,
 397         .llseek  = seq_lseek,
 398         .release = seq_release_private,
 399 };
 400 #endif
 401
 402 static unsigned int ip_confirm(unsigned int hooknum,
 403                                struct sk_buff **pskb,
 404                                const struct net_device *in,
 405                                const struct net_device *out,
 406                                int (*okfn)(struct sk_buff *))
 407 {
 408         /* We've seen it coming out the other side: confirm it */
 409         return ip_conntrack_confirm(pskb);
 410 }
 411
 412 static unsigned int ip_conntrack_help(unsigned int hooknum,
 413                                       struct sk_buff **pskb,
 414                                       const struct net_device *in,
 415                                       const struct net_device *out,
 416                                       int (*okfn)(struct sk_buff *))
 417 {
 418         struct ip_conntrack *ct;
 419         enum ip_conntrack_info ctinfo;
 420
 421         /* This is where we call the helper: as the packet goes out. */
 422         ct = ip_conntrack_get(*pskb, &ctinfo);
 423         if (ct && ct->helper && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) {
 424                 unsigned int ret;
 425                 ret = ct->helper->help(pskb, ct, ctinfo);
 426                 if (ret != NF_ACCEPT)
 427                         return ret;
 428         }
 429         return NF_ACCEPT;
 430 }
 431
 432 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 433                                         struct sk_buff **pskb,
 434                                         const struct net_device *in,
 435                                         const struct net_device *out,
 436                                         int (*okfn)(struct sk_buff *))
 437 {
 438 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
 439         /* Previously seen (loopback)?  Ignore.  Do this before
 440            fragment check. */
 441         if ((*pskb)->nfct)
 442                 return NF_ACCEPT;
 443 #endif
 444
 445         /* Gather fragments. */
 446         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
 447                 *pskb = ip_ct_gather_frags(*pskb,
 448                                            hooknum == NF_IP_PRE_ROUTING ?
 449                                            IP_DEFRAG_CONNTRACK_IN :
 450                                            IP_DEFRAG_CONNTRACK_OUT);
 451                 if (!*pskb)
 452                         return NF_STOLEN;
 453         }
 454         return NF_ACCEPT;
 455 }
 456
 457 static unsigned int ip_conntrack_local(unsigned int hooknum,
 458                                        struct sk_buff **pskb,
 459                                        const struct net_device *in,
 460                                        const struct net_device *out,
 461                                        int (*okfn)(struct sk_buff *))
 462 {
 463         /* root is playing with raw sockets. */
 464         if ((*pskb)->len < sizeof(struct iphdr)
 465             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 466                 if (net_ratelimit())
 467                         printk("ipt_hook: happy cracking.\n");
 468                 return NF_ACCEPT;
 469         }
 470         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 471 }
 472
 473 /* Connection tracking may drop packets, but never alters them, so
 474    make it the first hook. */
 475 static struct nf_hook_ops ip_conntrack_ops[] = {
 476         {
 477                 .hook           = ip_conntrack_defrag,
 478                 .owner          = THIS_MODULE,
 479                 .pf             = PF_INET,
 480                 .hooknum        = NF_IP_PRE_ROUTING,
 481                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 482         },
 483         {
 484                 .hook           = ip_conntrack_in,
 485                 .owner          = THIS_MODULE,
 486                 .pf             = PF_INET,
 487                 .hooknum        = NF_IP_PRE_ROUTING,
 488                 .priority       = NF_IP_PRI_CONNTRACK,
 489         },
 490         {
 491                 .hook           = ip_conntrack_defrag,
 492                 .owner          = THIS_MODULE,
 493                 .pf             = PF_INET,
 494                 .hooknum        = NF_IP_LOCAL_OUT,
 495                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 496         },
 497         {
 498                 .hook           = ip_conntrack_local,
 499                 .owner          = THIS_MODULE,
 500                 .pf             = PF_INET,
 501                 .hooknum        = NF_IP_LOCAL_OUT,
 502                 .priority       = NF_IP_PRI_CONNTRACK,
 503         },
 504         {
 505                 .hook           = ip_conntrack_help,
 506                 .owner          = THIS_MODULE,
 507                 .pf             = PF_INET,
 508                 .hooknum        = NF_IP_POST_ROUTING,
 509                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 510         },
 511         {
 512                 .hook           = ip_conntrack_help,
 513                 .owner          = THIS_MODULE,
 514                 .pf             = PF_INET,
 515                 .hooknum        = NF_IP_LOCAL_IN,
 516                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 517         },
 518         {
 519                 .hook           = ip_confirm,
 520                 .owner          = THIS_MODULE,
 521                 .pf             = PF_INET,
 522                 .hooknum        = NF_IP_POST_ROUTING,
 523                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 524         },
 525         {
 526                 .hook           = ip_confirm,
 527                 .owner          = THIS_MODULE,
 528                 .pf             = PF_INET,
 529                 .hooknum        = NF_IP_LOCAL_IN,
 530                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 531         },
 532 };
 533
 534 /* Sysctl support */
 535
 536 int ip_conntrack_checksum __read_mostly = 1;
 537
 538 #ifdef CONFIG_SYSCTL
 539
 540 /* From ip_conntrack_core.c */
 541 extern int ip_conntrack_max;
 542 extern unsigned int ip_conntrack_htable_size;
 543
 544 /* From ip_conntrack_proto_tcp.c */
 545 extern unsigned int ip_ct_tcp_timeout_syn_sent;
 546 extern unsigned int ip_ct_tcp_timeout_syn_recv;
 547 extern unsigned int ip_ct_tcp_timeout_established;
 548 extern unsigned int ip_ct_tcp_timeout_fin_wait;
 549 extern unsigned int ip_ct_tcp_timeout_close_wait;
 550 extern unsigned int ip_ct_tcp_timeout_last_ack;
 551 extern unsigned int ip_ct_tcp_timeout_time_wait;
 552 extern unsigned int ip_ct_tcp_timeout_close;
 553 extern unsigned int ip_ct_tcp_timeout_max_retrans;
 554 extern int ip_ct_tcp_loose;
 555 extern int ip_ct_tcp_be_liberal;
 556 extern int ip_ct_tcp_max_retrans;
 557
 558 /* From ip_conntrack_proto_udp.c */
 559 extern unsigned int ip_ct_udp_timeout;
 560 extern unsigned int ip_ct_udp_timeout_stream;
 561
 562 /* From ip_conntrack_proto_icmp.c */
 563 extern unsigned int ip_ct_icmp_timeout;
 564
 565 /* From ip_conntrack_proto_generic.c */
 566 extern unsigned int ip_ct_generic_timeout;
 567
 568 /* Log invalid packets of a given protocol */
 569 static int log_invalid_proto_min = 0;
 570 static int log_invalid_proto_max = 255;
 571
 572 static struct ctl_table_header *ip_ct_sysctl_header;
 573
 574 static ctl_table ip_ct_sysctl_table[] = {
 575         {
 576                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 577                 .procname       = "ip_conntrack_max",
 578                 .data           = &ip_conntrack_max,
 579                 .maxlen         = sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = &proc_dointvec,
 582         },
 583         {
 584                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 585                 .procname       = "ip_conntrack_count",
 586                 .data           = &ip_conntrack_count,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0444,
 589                 .proc_handler   = &proc_dointvec,
 590         },
 591         {
 592                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 593                 .procname       = "ip_conntrack_buckets",
 594                 .data           = &ip_conntrack_htable_size,
 595                 .maxlen         = sizeof(unsigned int),
 596                 .mode           = 0444,
 597                 .proc_handler   = &proc_dointvec,
 598         },
 599         {
 600                 .ctl_name       = NET_IPV4_NF_CONNTRACK_CHECKSUM,
 601                 .procname       = "ip_conntrack_checksum",
 602                 .data           = &ip_conntrack_checksum,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec,
 606         },
 607         {
 608                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 609                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 610                 .data           = &ip_ct_tcp_timeout_syn_sent,
 611                 .maxlen         = sizeof(unsigned int),
 612                 .mode           = 0644,
 613                 .proc_handler   = &proc_dointvec_jiffies,
 614         },
 615         {
 616                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 617                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 618                 .data           = &ip_ct_tcp_timeout_syn_recv,
 619                 .maxlen         = sizeof(unsigned int),
 620                 .mode           = 0644,
 621                 .proc_handler   = &proc_dointvec_jiffies,
 622         },
 623         {
 624                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 625                 .procname       = "ip_conntrack_tcp_timeout_established",
 626                 .data           = &ip_ct_tcp_timeout_established,
 627                 .maxlen         = sizeof(unsigned int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec_jiffies,
 630         },
 631         {
 632                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 633                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 634                 .data           = &ip_ct_tcp_timeout_fin_wait,
 635                 .maxlen         = sizeof(unsigned int),
 636                 .mode           = 0644,
 637                 .proc_handler   = &proc_dointvec_jiffies,
 638         },
 639         {
 640                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 641                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 642                 .data           = &ip_ct_tcp_timeout_close_wait,
 643                 .maxlen         = sizeof(unsigned int),
 644                 .mode           = 0644,
 645                 .proc_handler   = &proc_dointvec_jiffies,
 646         },
 647         {
 648                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 649                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 650                 .data           = &ip_ct_tcp_timeout_last_ack,
 651                 .maxlen         = sizeof(unsigned int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec_jiffies,
 654         },
 655         {
 656                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 657                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 658                 .data           = &ip_ct_tcp_timeout_time_wait,
 659                 .maxlen         = sizeof(unsigned int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_dointvec_jiffies,
 662         },
 663         {
 664                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 665                 .procname       = "ip_conntrack_tcp_timeout_close",
 666                 .data           = &ip_ct_tcp_timeout_close,
 667                 .maxlen         = sizeof(unsigned int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_dointvec_jiffies,
 670         },
 671         {
 672                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 673                 .procname       = "ip_conntrack_udp_timeout",
 674                 .data           = &ip_ct_udp_timeout,
 675                 .maxlen         = sizeof(unsigned int),
 676                 .mode           = 0644,
 677                 .proc_handler   = &proc_dointvec_jiffies,
 678         },
 679         {
 680                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 681                 .procname       = "ip_conntrack_udp_timeout_stream",
 682                 .data           = &ip_ct_udp_timeout_stream,
 683                 .maxlen         = sizeof(unsigned int),
 684                 .mode           = 0644,
 685                 .proc_handler   = &proc_dointvec_jiffies,
 686         },
 687         {
 688                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 689                 .procname       = "ip_conntrack_icmp_timeout",
 690                 .data           = &ip_ct_icmp_timeout,
 691                 .maxlen         = sizeof(unsigned int),
 692                 .mode           = 0644,
 693                 .proc_handler   = &proc_dointvec_jiffies,
 694         },
 695         {
 696                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 697                 .procname       = "ip_conntrack_generic_timeout",
 698                 .data           = &ip_ct_generic_timeout,
 699                 .maxlen         = sizeof(unsigned int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec_jiffies,
 702         },
 703         {
 704                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 705                 .procname       = "ip_conntrack_log_invalid",
 706                 .data           = &ip_ct_log_invalid,
 707                 .maxlen         = sizeof(unsigned int),
 708                 .mode           = 0644,
 709                 .proc_handler   = &proc_dointvec_minmax,
 710                 .strategy       = &sysctl_intvec,
 711                 .extra1         = &log_invalid_proto_min,
 712                 .extra2         = &log_invalid_proto_max,
 713         },
 714         {
 715                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 716                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 717                 .data           = &ip_ct_tcp_timeout_max_retrans,
 718                 .maxlen         = sizeof(unsigned int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec_jiffies,
 721         },
 722         {
 723                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 724                 .procname       = "ip_conntrack_tcp_loose",
 725                 .data           = &ip_ct_tcp_loose,
 726                 .maxlen         = sizeof(unsigned int),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_dointvec,
 729         },
 730         {
 731                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 732                 .procname       = "ip_conntrack_tcp_be_liberal",
 733                 .data           = &ip_ct_tcp_be_liberal,
 734                 .maxlen         = sizeof(unsigned int),
 735                 .mode           = 0644,
 736                 .proc_handler   = &proc_dointvec,
 737         },
 738         {
 739                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 740                 .procname       = "ip_conntrack_tcp_max_retrans",
 741                 .data           = &ip_ct_tcp_max_retrans,
 742                 .maxlen         = sizeof(unsigned int),
 743                 .mode           = 0644,
 744                 .proc_handler   = &proc_dointvec,
 745         },
 746         { .ctl_name = 0 }
 747 };
 748
 749 #define NET_IP_CONNTRACK_MAX 2089
 750
 751 static ctl_table ip_ct_netfilter_table[] = {
 752         {
 753                 .ctl_name       = NET_IPV4_NETFILTER,
 754                 .procname       = "netfilter",
 755                 .mode           = 0555,
 756                 .child          = ip_ct_sysctl_table,
 757         },
 758         {
 759                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 760                 .procname       = "ip_conntrack_max",
 761                 .data           = &ip_conntrack_max,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_dointvec
 765         },
 766         { .ctl_name = 0 }
 767 };
 768
 769 static ctl_table ip_ct_ipv4_table[] = {
 770         {
 771                 .ctl_name       = NET_IPV4,
 772                 .procname       = "ipv4",
 773                 .mode           = 0555,
 774                 .child          = ip_ct_netfilter_table,
 775         },
 776         { .ctl_name = 0 }
 777 };
 778
 779 static ctl_table ip_ct_net_table[] = {
 780         {
 781                 .ctl_name       = CTL_NET,
 782                 .procname       = "net",
 783                 .mode           = 0555,
 784                 .child          = ip_ct_ipv4_table,
 785         },
 786         { .ctl_name = 0 }
 787 };
 788
 789 EXPORT_SYMBOL(ip_ct_log_invalid);
 790 #endif /* CONFIG_SYSCTL */
 791
 792 /* FIXME: Allow NULL functions and sub in pointers to generic for
 793    them. --RR */
 794 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 795 {
 796         int ret = 0;
 797
 798         write_lock_bh(&ip_conntrack_lock);
 799         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 800                 ret = -EBUSY;
 801                 goto out;
 802         }
 803         ip_ct_protos[proto->proto] = proto;
 804  out:
 805         write_unlock_bh(&ip_conntrack_lock);
 806         return ret;
 807 }
 808
 809 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 810 {
 811         write_lock_bh(&ip_conntrack_lock);
 812         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 813         write_unlock_bh(&ip_conntrack_lock);
 814
 815         /* Somebody could be still looking at the proto in bh. */
 816         synchronize_net();
 817
 818         /* Remove all contrack entries for this protocol */
 819         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 820 }
 821
 822 static int __init ip_conntrack_standalone_init(void)
 823 {
 824 #ifdef CONFIG_PROC_FS
 825         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 826 #endif
 827         int ret = 0;
 828
 829         ret = ip_conntrack_init();
 830         if (ret < 0)
 831                 return ret;
 832
 833 #ifdef CONFIG_PROC_FS
 834         ret = -ENOMEM;
 835         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 836         if (!proc) goto cleanup_init;
 837
 838         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 839                                         &exp_file_ops);
 840         if (!proc_exp) goto cleanup_proc;
 841
 842         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 843         if (!proc_stat)
 844                 goto cleanup_proc_exp;
 845
 846         proc_stat->proc_fops = &ct_cpu_seq_fops;
 847         proc_stat->owner = THIS_MODULE;
 848 #endif
 849
 850         ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 851         if (ret < 0) {
 852                 printk("ip_conntrack: can't register hooks.\n");
 853                 goto cleanup_proc_stat;
 854         }
 855 #ifdef CONFIG_SYSCTL
 856         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 857         if (ip_ct_sysctl_header == NULL) {
 858                 printk("ip_conntrack: can't register to sysctl.\n");
 859                 ret = -ENOMEM;
 860                 goto cleanup_hooks;
 861         }
 862 #endif
 863         return ret;
 864
 865 #ifdef CONFIG_SYSCTL
 866  cleanup_hooks:
 867         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 868 #endif
 869  cleanup_proc_stat:
 870 #ifdef CONFIG_PROC_FS
 871         remove_proc_entry("ip_conntrack", proc_net_stat);
 872  cleanup_proc_exp:
 873         proc_net_remove("ip_conntrack_expect");
 874  cleanup_proc:
 875         proc_net_remove("ip_conntrack");
 876  cleanup_init:
 877 #endif /* CONFIG_PROC_FS */
 878         ip_conntrack_cleanup();
 879         return ret;
 880 }
 881
 882 static void __exit ip_conntrack_standalone_fini(void)
 883 {
 884         synchronize_net();
 885 #ifdef CONFIG_SYSCTL
 886         unregister_sysctl_table(ip_ct_sysctl_header);
 887 #endif
 888         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 889 #ifdef CONFIG_PROC_FS
 890         remove_proc_entry("ip_conntrack", proc_net_stat);
 891         proc_net_remove("ip_conntrack_expect");
 892         proc_net_remove("ip_conntrack");
 893 #endif /* CONFIG_PROC_FS */
 894         ip_conntrack_cleanup();
 895 }
 896
 897 module_init(ip_conntrack_standalone_init);
 898 module_exit(ip_conntrack_standalone_fini);
 899
 900 /* Some modules need us, but don't depend directly on any symbol.
 901    They should call this. */
 902 void need_conntrack(void)
 903 {
 904 }
 905
 906 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 907 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 908 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 909 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 910 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 911 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 912 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 913 #endif
 914 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 915 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 916 EXPORT_SYMBOL(ip_ct_get_tuple);
 917 EXPORT_SYMBOL(invert_tuplepr);
 918 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 919 EXPORT_SYMBOL(ip_conntrack_destroyed);
 920 EXPORT_SYMBOL(need_conntrack);
 921 EXPORT_SYMBOL(ip_conntrack_helper_register);
 922 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 923 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 924 EXPORT_SYMBOL(__ip_ct_refresh_acct);
 925
 926 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 927 EXPORT_SYMBOL(ip_conntrack_expect_put);
 928 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
 929 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find);
 930 EXPORT_SYMBOL(ip_conntrack_expect_related);
 931 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 932 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 933 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 934
 935 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 936 EXPORT_SYMBOL(ip_ct_gather_frags);
 937 EXPORT_SYMBOL(ip_conntrack_htable_size);
 938 EXPORT_SYMBOL(ip_conntrack_lock);
 939 EXPORT_SYMBOL(ip_conntrack_hash);
 940 EXPORT_SYMBOL(ip_conntrack_untracked);
 941 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
 942 #ifdef CONFIG_IP_NF_NAT_NEEDED
 943 EXPORT_SYMBOL(ip_conntrack_tcp_update);
 944 #endif
 945
 946 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
 947 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
 948
 949 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
 950 EXPORT_SYMBOL_GPL(ip_conntrack_free);
 951 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
 952
 953 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
 954
 955 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
 956 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
 957 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 958
 959 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
 960 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
 961 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
 962 EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
 963 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 964     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 965 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
 966 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
 967 #endif