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/timer.h>
  18 #include <linux/interrupt.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 int ip_ct_sctp_timeout_closed __read_mostly           = 10 SECS;
  61 static unsigned int ip_ct_sctp_timeout_cookie_wait __read_mostly      =  3 SECS;
  62 static unsigned int ip_ct_sctp_timeout_cookie_echoed __read_mostly    =  3 SECS;
  63 static unsigned int ip_ct_sctp_timeout_established __read_mostly      =  5 DAYS;
  64 static unsigned int ip_ct_sctp_timeout_shutdown_sent __read_mostly    = 300 SECS / 1000;
  65 static unsigned int ip_ct_sctp_timeout_shutdown_recd __read_mostly    = 300 SECS / 1000;
  66 static unsigned int ip_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  67
  68 static const unsigned int * 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 const 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 += (ntohs(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                 /*
 238                  * Cookie Ack/Echo chunks not the first OR
 239                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 240                  * OR zero-length.
 241                  */
 242                 if (((sch->type == SCTP_CID_COOKIE_ACK
 243                         || sch->type == SCTP_CID_COOKIE_ECHO
 244                         || flag)
 245                       && count !=0) || !sch->length) {
 246                         DEBUGP("Basic checks failed\n");
 247                         return 1;
 248                 }
 249
 250                 if (map) {
 251                         set_bit(sch->type, (void *)map);
 252                 }
 253         }
 254
 255         DEBUGP("Basic checks passed\n");
 256         return count == 0;
 257 }
 258
 259 static int new_state(enum ip_conntrack_dir dir,
 260                      enum sctp_conntrack cur_state,
 261                      int chunk_type)
 262 {
 263         int i;
 264
 265         DEBUGP(__FUNCTION__);
 266         DEBUGP("\n");
 267
 268         DEBUGP("Chunk type: %d\n", chunk_type);
 269
 270         switch (chunk_type) {
 271                 case SCTP_CID_INIT:
 272                         DEBUGP("SCTP_CID_INIT\n");
 273                         i = 0; break;
 274                 case SCTP_CID_INIT_ACK:
 275                         DEBUGP("SCTP_CID_INIT_ACK\n");
 276                         i = 1; break;
 277                 case SCTP_CID_ABORT:
 278                         DEBUGP("SCTP_CID_ABORT\n");
 279                         i = 2; break;
 280                 case SCTP_CID_SHUTDOWN:
 281                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 282                         i = 3; break;
 283                 case SCTP_CID_SHUTDOWN_ACK:
 284                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 285                         i = 4; break;
 286                 case SCTP_CID_ERROR:
 287                         DEBUGP("SCTP_CID_ERROR\n");
 288                         i = 5; break;
 289                 case SCTP_CID_COOKIE_ECHO:
 290                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 291                         i = 6; break;
 292                 case SCTP_CID_COOKIE_ACK:
 293                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 294                         i = 7; break;
 295                 case SCTP_CID_SHUTDOWN_COMPLETE:
 296                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 297                         i = 8; break;
 298                 default:
 299                         /* Other chunks like DATA, SACK, HEARTBEAT and
 300                         its ACK do not cause a change in state */
 301                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 302                                                 sctp_conntrack_names[cur_state]);
 303                         return cur_state;
 304         }
 305
 306         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 307                         dir, sctp_conntrack_names[cur_state], chunk_type,
 308                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 309
 310         return sctp_conntracks[dir][i][cur_state];
 311 }
 312
 313 /* Returns verdict for packet, or -1 for invalid. */
 314 static int sctp_packet(struct ip_conntrack *conntrack,
 315                        const struct sk_buff *skb,
 316                        enum ip_conntrack_info ctinfo)
 317 {
 318         enum sctp_conntrack newconntrack, oldsctpstate;
 319         struct iphdr *iph = skb->nh.iph;
 320         sctp_sctphdr_t _sctph, *sh;
 321         sctp_chunkhdr_t _sch, *sch;
 322         u_int32_t offset, count;
 323         char map[256 / sizeof (char)] = {0};
 324
 325         DEBUGP(__FUNCTION__);
 326         DEBUGP("\n");
 327
 328         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 329         if (sh == NULL)
 330                 return -1;
 331
 332         if (do_basic_checks(conntrack, skb, map) != 0)
 333                 return -1;
 334
 335         /* Check the verification tag (Sec 8.5) */
 336         if (!test_bit(SCTP_CID_INIT, (void *)map)
 337                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 338                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 339                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 340                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 341                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 342                 DEBUGP("Verification tag check failed\n");
 343                 return -1;
 344         }
 345
 346         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 347         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 348                 write_lock_bh(&sctp_lock);
 349
 350                 /* Special cases of Verification tag check (Sec 8.5.1) */
 351                 if (sch->type == SCTP_CID_INIT) {
 352                         /* Sec 8.5.1 (A) */
 353                         if (sh->vtag != 0) {
 354                                 write_unlock_bh(&sctp_lock);
 355                                 return -1;
 356                         }
 357                 } else if (sch->type == SCTP_CID_ABORT) {
 358                         /* Sec 8.5.1 (B) */
 359                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 360                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 361                                                         [1 - CTINFO2DIR(ctinfo)])) {
 362                                 write_unlock_bh(&sctp_lock);
 363                                 return -1;
 364                         }
 365                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 366                         /* Sec 8.5.1 (C) */
 367                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 368                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 369                                                         [1 - CTINFO2DIR(ctinfo)]
 370                                         && (sch->flags & 1))) {
 371                                 write_unlock_bh(&sctp_lock);
 372                                 return -1;
 373                         }
 374                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 375                         /* Sec 8.5.1 (D) */
 376                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 377                                 write_unlock_bh(&sctp_lock);
 378                                 return -1;
 379                         }
 380                 }
 381
 382                 oldsctpstate = conntrack->proto.sctp.state;
 383                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 384
 385                 /* Invalid */
 386                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 387                         DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 388                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 389                         write_unlock_bh(&sctp_lock);
 390                         return -1;
 391                 }
 392
 393                 /* If it is an INIT or an INIT ACK note down the vtag */
 394                 if (sch->type == SCTP_CID_INIT
 395                         || sch->type == SCTP_CID_INIT_ACK) {
 396                         sctp_inithdr_t _inithdr, *ih;
 397
 398                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 399                                                 sizeof(_inithdr), &_inithdr);
 400                         if (ih == NULL) {
 401                                         write_unlock_bh(&sctp_lock);
 402                                         return -1;
 403                         }
 404                         DEBUGP("Setting vtag %x for dir %d\n",
 405                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 406                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 407                 }
 408
 409                 conntrack->proto.sctp.state = newconntrack;
 410                 if (oldsctpstate != newconntrack)
 411                         ip_conntrack_event_cache(IPCT_PROTOINFO, skb);
 412                 write_unlock_bh(&sctp_lock);
 413         }
 414
 415         ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 416
 417         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 418                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 419                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 420                 DEBUGP("Setting assured bit\n");
 421                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 422                 ip_conntrack_event_cache(IPCT_STATUS, skb);
 423         }
 424
 425         return NF_ACCEPT;
 426 }
 427
 428 /* Called when a new connection for this protocol found. */
 429 static int sctp_new(struct ip_conntrack *conntrack,
 430                     const struct sk_buff *skb)
 431 {
 432         enum sctp_conntrack newconntrack;
 433         struct iphdr *iph = skb->nh.iph;
 434         sctp_sctphdr_t _sctph, *sh;
 435         sctp_chunkhdr_t _sch, *sch;
 436         u_int32_t offset, count;
 437         char map[256 / sizeof (char)] = {0};
 438
 439         DEBUGP(__FUNCTION__);
 440         DEBUGP("\n");
 441
 442         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 443         if (sh == NULL)
 444                 return 0;
 445
 446         if (do_basic_checks(conntrack, skb, map) != 0)
 447                 return 0;
 448
 449         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 450         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 451                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 452                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 453                 return 0;
 454         }
 455
 456         newconntrack = SCTP_CONNTRACK_MAX;
 457         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 458                 /* Don't need lock here: this conntrack not in circulation yet */
 459                 newconntrack = new_state (IP_CT_DIR_ORIGINAL,
 460                                                 SCTP_CONNTRACK_NONE, sch->type);
 461
 462                 /* Invalid: delete conntrack */
 463                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 464                         DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
 465                         return 0;
 466                 }
 467
 468                 /* Copy the vtag into the state info */
 469                 if (sch->type == SCTP_CID_INIT) {
 470                         if (sh->vtag == 0) {
 471                                 sctp_inithdr_t _inithdr, *ih;
 472
 473                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 474                                                         sizeof(_inithdr), &_inithdr);
 475                                 if (ih == NULL)
 476                                         return 0;
 477
 478                                 DEBUGP("Setting vtag %x for new conn\n",
 479                                         ih->init_tag);
 480
 481                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 482                                                                 ih->init_tag;
 483                         } else {
 484                                 /* Sec 8.5.1 (A) */
 485                                 return 0;
 486                         }
 487                 }
 488                 /* If it is a shutdown ack OOTB packet, we expect a return
 489                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 490                 else {
 491                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 492                                 sh->vtag);
 493                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 494                 }
 495
 496                 conntrack->proto.sctp.state = newconntrack;
 497         }
 498
 499         return 1;
 500 }
 501
 502 static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
 503         .proto           = IPPROTO_SCTP,
 504         .name            = "sctp",
 505         .pkt_to_tuple    = sctp_pkt_to_tuple,
 506         .invert_tuple    = sctp_invert_tuple,
 507         .print_tuple     = sctp_print_tuple,
 508         .print_conntrack = sctp_print_conntrack,
 509         .packet          = sctp_packet,
 510         .new             = sctp_new,
 511         .destroy         = NULL,
 512         .me              = THIS_MODULE,
 513 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 514     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 515         .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
 516         .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
 517 #endif
 518 };
 519
 520 #ifdef CONFIG_SYSCTL
 521 static ctl_table ip_ct_sysctl_table[] = {
 522         {
 523                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 524                 .procname       = "ip_conntrack_sctp_timeout_closed",
 525                 .data           = &ip_ct_sctp_timeout_closed,
 526                 .maxlen         = sizeof(unsigned int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec_jiffies,
 529         },
 530         {
 531                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 532                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 533                 .data           = &ip_ct_sctp_timeout_cookie_wait,
 534                 .maxlen         = sizeof(unsigned int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec_jiffies,
 537         },
 538         {
 539                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 540                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 541                 .data           = &ip_ct_sctp_timeout_cookie_echoed,
 542                 .maxlen         = sizeof(unsigned int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec_jiffies,
 545         },
 546         {
 547                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 548                 .procname       = "ip_conntrack_sctp_timeout_established",
 549                 .data           = &ip_ct_sctp_timeout_established,
 550                 .maxlen         = sizeof(unsigned int),
 551                 .mode           = 0644,
 552                 .proc_handler   = &proc_dointvec_jiffies,
 553         },
 554         {
 555                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 556                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 557                 .data           = &ip_ct_sctp_timeout_shutdown_sent,
 558                 .maxlen         = sizeof(unsigned int),
 559                 .mode           = 0644,
 560                 .proc_handler   = &proc_dointvec_jiffies,
 561         },
 562         {
 563                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 564                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 565                 .data           = &ip_ct_sctp_timeout_shutdown_recd,
 566                 .maxlen         = sizeof(unsigned int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec_jiffies,
 569         },
 570         {
 571                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 572                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 573                 .data           = &ip_ct_sctp_timeout_shutdown_ack_sent,
 574                 .maxlen         = sizeof(unsigned int),
 575                 .mode           = 0644,
 576                 .proc_handler   = &proc_dointvec_jiffies,
 577         },
 578         { .ctl_name = 0 }
 579 };
 580
 581 static ctl_table ip_ct_netfilter_table[] = {
 582         {
 583                 .ctl_name       = NET_IPV4_NETFILTER,
 584                 .procname       = "netfilter",
 585                 .mode           = 0555,
 586                 .child          = ip_ct_sysctl_table,
 587         },
 588         { .ctl_name = 0 }
 589 };
 590
 591 static ctl_table ip_ct_ipv4_table[] = {
 592         {
 593                 .ctl_name       = NET_IPV4,
 594                 .procname       = "ipv4",
 595                 .mode           = 0555,
 596                 .child          = ip_ct_netfilter_table,
 597         },
 598         { .ctl_name = 0 }
 599 };
 600
 601 static ctl_table ip_ct_net_table[] = {
 602         {
 603                 .ctl_name       = CTL_NET,
 604                 .procname       = "net",
 605                 .mode           = 0555,
 606                 .child          = ip_ct_ipv4_table,
 607         },
 608         { .ctl_name = 0 }
 609 };
 610
 611 static struct ctl_table_header *ip_ct_sysctl_header;
 612 #endif
 613
 614 static int __init ip_conntrack_proto_sctp_init(void)
 615 {
 616         int ret;
 617
 618         ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
 619         if (ret) {
 620                 printk("ip_conntrack_proto_sctp: protocol register failed\n");
 621                 goto out;
 622         }
 623
 624 #ifdef CONFIG_SYSCTL
 625         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
 626         if (ip_ct_sysctl_header == NULL) {
 627                 ret = -ENOMEM;
 628                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
 629                 goto cleanup;
 630         }
 631 #endif
 632
 633         return ret;
 634
 635 #ifdef CONFIG_SYSCTL
 636  cleanup:
 637         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 638 #endif
 639  out:
 640         DEBUGP("SCTP conntrack module loading %s\n",
 641                                         ret ? "failed": "succeeded");
 642         return ret;
 643 }
 644
 645 static void __exit ip_conntrack_proto_sctp_fini(void)
 646 {
 647         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 648 #ifdef CONFIG_SYSCTL
 649         unregister_sysctl_table(ip_ct_sysctl_header);
 650 #endif
 651         DEBUGP("SCTP conntrack module unloaded\n");
 652 }
 653
 654 module_init(ip_conntrack_proto_sctp_init);
 655 module_exit(ip_conntrack_proto_sctp_fini);
 656
 657 MODULE_LICENSE("GPL");
 658 MODULE_AUTHOR("Kiran Kumar Immidi");
 659 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");