net/ipv4/netfilter/ip_conntrack_proto_sctp.c

   1 /*
   2  * Connection tracking protocol helper module for SCTP.
   3  *
   4  * SCTP is defined in RFC 2960. References to various sections in this code
   5  * are to this RFC.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 /*
  13  * Added support for proc manipulation of timeouts.
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/sched.h>
  18 #include <linux/timer.h>
  19 #include <linux/netfilter.h>
  20 #include <linux/module.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/sctp.h>
  24 #include <linux/string.h>
  25 #include <linux/seq_file.h>
  26
  27 #include <linux/netfilter_ipv4/ip_conntrack.h>
  28 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  29
  30 #if 0
  31 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  32 #else
  33 #define DEBUGP(format, args...)
  34 #endif
  35
  36 /* Protects conntrack->proto.sctp */
  37 static DEFINE_RWLOCK(sctp_lock);
  38
  39 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  40    closely.  They're more complex. --RR
  41
  42    And so for me for SCTP :D -Kiran */
  43
  44 static const char *sctp_conntrack_names[] = {
  45         "NONE",
  46         "CLOSED",
  47         "COOKIE_WAIT",
  48         "COOKIE_ECHOED",
  49         "ESTABLISHED",
  50         "SHUTDOWN_SENT",
  51         "SHUTDOWN_RECD",
  52         "SHUTDOWN_ACK_SENT",
  53 };
  54
  55 #define SECS  * HZ
  56 #define MINS  * 60 SECS
  57 #define HOURS * 60 MINS
  58 #define DAYS  * 24 HOURS
  59
  60 static unsigned long ip_ct_sctp_timeout_closed            =  10 SECS;
  61 static unsigned long ip_ct_sctp_timeout_cookie_wait       =   3 SECS;
  62 static unsigned long ip_ct_sctp_timeout_cookie_echoed     =   3 SECS;
  63 static unsigned long ip_ct_sctp_timeout_established       =   5 DAYS;
  64 static unsigned long ip_ct_sctp_timeout_shutdown_sent     = 300 SECS / 1000;
  65 static unsigned long ip_ct_sctp_timeout_shutdown_recd     = 300 SECS / 1000;
  66 static unsigned long ip_ct_sctp_timeout_shutdown_ack_sent =   3 SECS;
  67
  68 static unsigned long * sctp_timeouts[]
  69 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  70     &ip_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  71     &ip_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  72     &ip_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  73     &ip_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  74     &ip_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  75     &ip_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  76     &ip_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  77  };
  78
  79 #define sNO SCTP_CONNTRACK_NONE
  80 #define sCL SCTP_CONNTRACK_CLOSED
  81 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  82 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  83 #define sES SCTP_CONNTRACK_ESTABLISHED
  84 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  85 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  86 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  87 #define sIV SCTP_CONNTRACK_MAX
  88
  89 /*
  90         These are the descriptions of the states:
  91
  92 NOTE: These state names are tantalizingly similar to the states of an
  93 SCTP endpoint. But the interpretation of the states is a little different,
  94 considering that these are the states of the connection and not of an end
  95 point. Please note the subtleties. -Kiran
  96
  97 NONE              - Nothing so far.
  98 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  99                     an INIT_ACK chunk in the reply direction.
 100 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 101 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 102 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 103 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 104 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 105                     to that of the SHUTDOWN chunk.
 106 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 107                     the SHUTDOWN chunk. Connection is closed.
 108 */
 109
 110 /* TODO
 111  - I have assumed that the first INIT is in the original direction.
 112  This messes things when an INIT comes in the reply direction in CLOSED
 113  state.
 114  - Check the error type in the reply dir before transitioning from
 115 cookie echoed to closed.
 116  - Sec 5.2.4 of RFC 2960
 117  - Multi Homing support.
 118 */
 119
 120 /* SCTP conntrack state transitions */
 121 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 122         {
 123 /*      ORIGINAL        */
 124 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 125 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 126 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 127 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 128 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 129 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 130 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 131 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 132 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 133 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 134         },
 135         {
 136 /*      REPLY   */
 137 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 138 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 139 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 140 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 141 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 142 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 143 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 144 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 145 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 146 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 147         }
 148 };
 149
 150 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 151                              unsigned int dataoff,
 152                              struct ip_conntrack_tuple *tuple)
 153 {
 154         sctp_sctphdr_t _hdr, *hp;
 155
 156         DEBUGP(__FUNCTION__);
 157         DEBUGP("\n");
 158
 159         /* Actually only need first 8 bytes. */
 160         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 161         if (hp == NULL)
 162                 return 0;
 163
 164         tuple->src.u.sctp.port = hp->source;
 165         tuple->dst.u.sctp.port = hp->dest;
 166         return 1;
 167 }
 168
 169 static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
 170                              const struct ip_conntrack_tuple *orig)
 171 {
 172         DEBUGP(__FUNCTION__);
 173         DEBUGP("\n");
 174
 175         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 176         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 177         return 1;
 178 }
 179
 180 /* Print out the per-protocol part of the tuple. */
 181 static int sctp_print_tuple(struct seq_file *s,
 182                             const struct ip_conntrack_tuple *tuple)
 183 {
 184         DEBUGP(__FUNCTION__);
 185         DEBUGP("\n");
 186
 187         return seq_printf(s, "sport=%hu dport=%hu ",
 188                           ntohs(tuple->src.u.sctp.port),
 189                           ntohs(tuple->dst.u.sctp.port));
 190 }
 191
 192 /* Print out the private part of the conntrack. */
 193 static int sctp_print_conntrack(struct seq_file *s,
 194                                 const struct ip_conntrack *conntrack)
 195 {
 196         enum sctp_conntrack state;
 197
 198         DEBUGP(__FUNCTION__);
 199         DEBUGP("\n");
 200
 201         read_lock_bh(&sctp_lock);
 202         state = conntrack->proto.sctp.state;
 203         read_unlock_bh(&sctp_lock);
 204
 205         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 206 }
 207
 208 #define for_each_sctp_chunk(skb, sch, _sch, offset, count)              \
 209 for (offset = skb->nh.iph->ihl * 4 + sizeof(sctp_sctphdr_t), count = 0; \
 210         offset < skb->len &&                                            \
 211         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 212         offset += (htons(sch->length) + 3) & ~3, count++)
 213
 214 /* Some validity checks to make sure the chunks are fine */
 215 static int do_basic_checks(struct ip_conntrack *conntrack,
 216                            const struct sk_buff *skb,
 217                            char *map)
 218 {
 219         u_int32_t offset, count;
 220         sctp_chunkhdr_t _sch, *sch;
 221         int flag;
 222
 223         DEBUGP(__FUNCTION__);
 224         DEBUGP("\n");
 225
 226         flag = 0;
 227
 228         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 229                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 230
 231                 if (sch->type == SCTP_CID_INIT
 232                         || sch->type == SCTP_CID_INIT_ACK
 233                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 234                         flag = 1;
 235                 }
 236
 237                 /* Cookie Ack/Echo chunks not the first OR
 238                    Init / Init Ack / Shutdown compl chunks not the only chunks */
 239                 if ((sch->type == SCTP_CID_COOKIE_ACK
 240                         || sch->type == SCTP_CID_COOKIE_ECHO
 241                         || flag)
 242                      && count !=0 ) {
 243                         DEBUGP("Basic checks failed\n");
 244                         return 1;
 245                 }
 246
 247                 if (map) {
 248                         set_bit(sch->type, (void *)map);
 249                 }
 250         }
 251
 252         DEBUGP("Basic checks passed\n");
 253         return 0;
 254 }
 255
 256 static int new_state(enum ip_conntrack_dir dir,
 257                      enum sctp_conntrack cur_state,
 258                      int chunk_type)
 259 {
 260         int i;
 261
 262         DEBUGP(__FUNCTION__);
 263         DEBUGP("\n");
 264
 265         DEBUGP("Chunk type: %d\n", chunk_type);
 266
 267         switch (chunk_type) {
 268                 case SCTP_CID_INIT:
 269                         DEBUGP("SCTP_CID_INIT\n");
 270                         i = 0; break;
 271                 case SCTP_CID_INIT_ACK:
 272                         DEBUGP("SCTP_CID_INIT_ACK\n");
 273                         i = 1; break;
 274                 case SCTP_CID_ABORT:
 275                         DEBUGP("SCTP_CID_ABORT\n");
 276                         i = 2; break;
 277                 case SCTP_CID_SHUTDOWN:
 278                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 279                         i = 3; break;
 280                 case SCTP_CID_SHUTDOWN_ACK:
 281                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 282                         i = 4; break;
 283                 case SCTP_CID_ERROR:
 284                         DEBUGP("SCTP_CID_ERROR\n");
 285                         i = 5; break;
 286                 case SCTP_CID_COOKIE_ECHO:
 287                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 288                         i = 6; break;
 289                 case SCTP_CID_COOKIE_ACK:
 290                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 291                         i = 7; break;
 292                 case SCTP_CID_SHUTDOWN_COMPLETE:
 293                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 294                         i = 8; break;
 295                 default:
 296                         /* Other chunks like DATA, SACK, HEARTBEAT and
 297                         its ACK do not cause a change in state */
 298                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 299                                                 sctp_conntrack_names[cur_state]);
 300                         return cur_state;
 301         }
 302
 303         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 304                         dir, sctp_conntrack_names[cur_state], chunk_type,
 305                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 306
 307         return sctp_conntracks[dir][i][cur_state];
 308 }
 309
 310 /* Returns verdict for packet, or -1 for invalid. */
 311 static int sctp_packet(struct ip_conntrack *conntrack,
 312                        const struct sk_buff *skb,
 313                        enum ip_conntrack_info ctinfo)
 314 {
 315         enum sctp_conntrack newconntrack, oldsctpstate;
 316         struct iphdr *iph = skb->nh.iph;
 317         sctp_sctphdr_t _sctph, *sh;
 318         sctp_chunkhdr_t _sch, *sch;
 319         u_int32_t offset, count;
 320         char map[256 / sizeof (char)] = {0};
 321
 322         DEBUGP(__FUNCTION__);
 323         DEBUGP("\n");
 324
 325         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 326         if (sh == NULL)
 327                 return -1;
 328
 329         if (do_basic_checks(conntrack, skb, map) != 0)
 330                 return -1;
 331
 332         /* Check the verification tag (Sec 8.5) */
 333         if (!test_bit(SCTP_CID_INIT, (void *)map)
 334                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 335                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 336                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 337                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 338                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 339                 DEBUGP("Verification tag check failed\n");
 340                 return -1;
 341         }
 342
 343         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 344         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 345                 write_lock_bh(&sctp_lock);
 346
 347                 /* Special cases of Verification tag check (Sec 8.5.1) */
 348                 if (sch->type == SCTP_CID_INIT) {
 349                         /* Sec 8.5.1 (A) */
 350                         if (sh->vtag != 0) {
 351                                 write_unlock_bh(&sctp_lock);
 352                                 return -1;
 353                         }
 354                 } else if (sch->type == SCTP_CID_ABORT) {
 355                         /* Sec 8.5.1 (B) */
 356                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 357                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 358                                                         [1 - CTINFO2DIR(ctinfo)])) {
 359                                 write_unlock_bh(&sctp_lock);
 360                                 return -1;
 361                         }
 362                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 363                         /* Sec 8.5.1 (C) */
 364                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 365                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 366                                                         [1 - CTINFO2DIR(ctinfo)]
 367                                         && (sch->flags & 1))) {
 368                                 write_unlock_bh(&sctp_lock);
 369                                 return -1;
 370                         }
 371                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 372                         /* Sec 8.5.1 (D) */
 373                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 374                                 write_unlock_bh(&sctp_lock);
 375                                 return -1;
 376                         }
 377                 }
 378
 379                 oldsctpstate = conntrack->proto.sctp.state;
 380                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 381
 382                 /* Invalid */
 383                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 384                         DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 385                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 386                         write_unlock_bh(&sctp_lock);
 387                         return -1;
 388                 }
 389
 390                 /* If it is an INIT or an INIT ACK note down the vtag */
 391                 if (sch->type == SCTP_CID_INIT
 392                         || sch->type == SCTP_CID_INIT_ACK) {
 393                         sctp_inithdr_t _inithdr, *ih;
 394
 395                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 396                                                 sizeof(_inithdr), &_inithdr);
 397                         if (ih == NULL) {
 398                                         write_unlock_bh(&sctp_lock);
 399                                         return -1;
 400                         }
 401                         DEBUGP("Setting vtag %x for dir %d\n",
 402                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 403                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 404                 }
 405
 406                 conntrack->proto.sctp.state = newconntrack;
 407                 write_unlock_bh(&sctp_lock);
 408         }
 409
 410         ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 411
 412         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 413                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 414                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 415                 DEBUGP("Setting assured bit\n");
 416                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 417         }
 418
 419         return NF_ACCEPT;
 420 }
 421
 422 /* Called when a new connection for this protocol found. */
 423 static int sctp_new(struct ip_conntrack *conntrack,
 424                     const struct sk_buff *skb)
 425 {
 426         enum sctp_conntrack newconntrack;
 427         struct iphdr *iph = skb->nh.iph;
 428         sctp_sctphdr_t _sctph, *sh;
 429         sctp_chunkhdr_t _sch, *sch;
 430         u_int32_t offset, count;
 431         char map[256 / sizeof (char)] = {0};
 432
 433         DEBUGP(__FUNCTION__);
 434         DEBUGP("\n");
 435
 436         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 437         if (sh == NULL)
 438                 return 0;
 439
 440         if (do_basic_checks(conntrack, skb, map) != 0)
 441                 return 0;
 442
 443         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 444         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 445                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 446                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 447                 return 0;
 448         }
 449
 450         newconntrack = SCTP_CONNTRACK_MAX;
 451         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 452                 /* Don't need lock here: this conntrack not in circulation yet */
 453                 newconntrack = new_state (IP_CT_DIR_ORIGINAL,
 454                                                 SCTP_CONNTRACK_NONE, sch->type);
 455
 456                 /* Invalid: delete conntrack */
 457                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 458                         DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
 459                         return 0;
 460                 }
 461
 462                 /* Copy the vtag into the state info */
 463                 if (sch->type == SCTP_CID_INIT) {
 464                         if (sh->vtag == 0) {
 465                                 sctp_inithdr_t _inithdr, *ih;
 466
 467                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 468                                                         sizeof(_inithdr), &_inithdr);
 469                                 if (ih == NULL)
 470                                         return 0;
 471
 472                                 DEBUGP("Setting vtag %x for new conn\n",
 473                                         ih->init_tag);
 474
 475                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 476                                                                 ih->init_tag;
 477                         } else {
 478                                 /* Sec 8.5.1 (A) */
 479                                 return 0;
 480                         }
 481                 }
 482                 /* If it is a shutdown ack OOTB packet, we expect a return
 483                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 484                 else {
 485                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 486                                 sh->vtag);
 487                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 488                 }
 489
 490                 conntrack->proto.sctp.state = newconntrack;
 491         }
 492
 493         return 1;
 494 }
 495
 496 static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
 497         .proto           = IPPROTO_SCTP,
 498         .name            = "sctp",
 499         .pkt_to_tuple    = sctp_pkt_to_tuple,
 500         .invert_tuple    = sctp_invert_tuple,
 501         .print_tuple     = sctp_print_tuple,
 502         .print_conntrack = sctp_print_conntrack,
 503         .packet          = sctp_packet,
 504         .new             = sctp_new,
 505         .destroy         = NULL,
 506         .me              = THIS_MODULE
 507 };
 508
 509 #ifdef CONFIG_SYSCTL
 510 static ctl_table ip_ct_sysctl_table[] = {
 511         {
 512                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 513                 .procname       = "ip_conntrack_sctp_timeout_closed",
 514                 .data           = &ip_ct_sctp_timeout_closed,
 515                 .maxlen         = sizeof(unsigned int),
 516                 .mode           = 0644,
 517                 .proc_handler   = &proc_dointvec_jiffies,
 518         },
 519         {
 520                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 521                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 522                 .data           = &ip_ct_sctp_timeout_cookie_wait,
 523                 .maxlen         = sizeof(unsigned int),
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dointvec_jiffies,
 526         },
 527         {
 528                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 529                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 530                 .data           = &ip_ct_sctp_timeout_cookie_echoed,
 531                 .maxlen         = sizeof(unsigned int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec_jiffies,
 534         },
 535         {
 536                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 537                 .procname       = "ip_conntrack_sctp_timeout_established",
 538                 .data           = &ip_ct_sctp_timeout_established,
 539                 .maxlen         = sizeof(unsigned int),
 540                 .mode           = 0644,
 541                 .proc_handler   = &proc_dointvec_jiffies,
 542         },
 543         {
 544                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 545                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 546                 .data           = &ip_ct_sctp_timeout_shutdown_sent,
 547                 .maxlen         = sizeof(unsigned int),
 548                 .mode           = 0644,
 549                 .proc_handler   = &proc_dointvec_jiffies,
 550         },
 551         {
 552                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 553                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 554                 .data           = &ip_ct_sctp_timeout_shutdown_recd,
 555                 .maxlen         = sizeof(unsigned int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec_jiffies,
 558         },
 559         {
 560                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 561                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 562                 .data           = &ip_ct_sctp_timeout_shutdown_ack_sent,
 563                 .maxlen         = sizeof(unsigned int),
 564                 .mode           = 0644,
 565                 .proc_handler   = &proc_dointvec_jiffies,
 566         },
 567         { .ctl_name = 0 }
 568 };
 569
 570 static ctl_table ip_ct_netfilter_table[] = {
 571         {
 572                 .ctl_name       = NET_IPV4_NETFILTER,
 573                 .procname       = "netfilter",
 574                 .mode           = 0555,
 575                 .child          = ip_ct_sysctl_table,
 576         },
 577         { .ctl_name = 0 }
 578 };
 579
 580 static ctl_table ip_ct_ipv4_table[] = {
 581         {
 582                 .ctl_name       = NET_IPV4,
 583                 .procname       = "ipv4",
 584                 .mode           = 0555,
 585                 .child          = ip_ct_netfilter_table,
 586         },
 587         { .ctl_name = 0 }
 588 };
 589
 590 static ctl_table ip_ct_net_table[] = {
 591         {
 592                 .ctl_name       = CTL_NET,
 593                 .procname       = "net",
 594                 .mode           = 0555,
 595                 .child          = ip_ct_ipv4_table,
 596         },
 597         { .ctl_name = 0 }
 598 };
 599
 600 static struct ctl_table_header *ip_ct_sysctl_header;
 601 #endif
 602
 603 static int __init init(void)
 604 {
 605         int ret;
 606
 607         ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
 608         if (ret) {
 609                 printk("ip_conntrack_proto_sctp: protocol register failed\n");
 610                 goto out;
 611         }
 612
 613 #ifdef CONFIG_SYSCTL
 614         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 615         if (ip_ct_sysctl_header == NULL) {
 616                 ret = -ENOMEM;
 617                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
 618                 goto cleanup;
 619         }
 620 #endif
 621
 622         return ret;
 623
 624 #ifdef CONFIG_SYSCTL
 625  cleanup:
 626         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 627 #endif
 628  out:
 629         DEBUGP("SCTP conntrack module loading %s\n",
 630                                         ret ? "failed": "succeeded");
 631         return ret;
 632 }
 633
 634 static void __exit fini(void)
 635 {
 636         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 637 #ifdef CONFIG_SYSCTL
 638         unregister_sysctl_table(ip_ct_sysctl_header);
 639 #endif
 640         DEBUGP("SCTP conntrack module unloaded\n");
 641 }
 642
 643 module_init(init);
 644 module_exit(fini);
 645
 646 MODULE_LICENSE("GPL");
 647 MODULE_AUTHOR("Kiran Kumar Immidi");
 648 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");