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/interrupt.h>
  20 #include <linux/netfilter.h>
  21 #include <linux/module.h>
  22 #include <linux/in.h>
  23 #include <linux/ip.h>
  24 #include <linux/sctp.h>
  25 #include <linux/string.h>
  26 #include <linux/seq_file.h>
  27
  28 #include <linux/netfilter_ipv4/ip_conntrack.h>
  29 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  30
  31 #if 0
  32 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  33 #else
  34 #define DEBUGP(format, args...)
  35 #endif
  36
  37 /* Protects conntrack->proto.sctp */
  38 static DEFINE_RWLOCK(sctp_lock);
  39
  40 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  41    closely.  They're more complex. --RR
  42
  43    And so for me for SCTP :D -Kiran */
  44
  45 static const char *sctp_conntrack_names[] = {
  46         "NONE",
  47         "CLOSED",
  48         "COOKIE_WAIT",
  49         "COOKIE_ECHOED",
  50         "ESTABLISHED",
  51         "SHUTDOWN_SENT",
  52         "SHUTDOWN_RECD",
  53         "SHUTDOWN_ACK_SENT",
  54 };
  55
  56 #define SECS  * HZ
  57 #define MINS  * 60 SECS
  58 #define HOURS * 60 MINS
  59 #define DAYS  * 24 HOURS
  60
  61 static unsigned int ip_ct_sctp_timeout_closed __read_mostly           = 10 SECS;
  62 static unsigned int ip_ct_sctp_timeout_cookie_wait __read_mostly      =  3 SECS;
  63 static unsigned int ip_ct_sctp_timeout_cookie_echoed __read_mostly    =  3 SECS;
  64 static unsigned int ip_ct_sctp_timeout_established __read_mostly      =  5 DAYS;
  65 static unsigned int ip_ct_sctp_timeout_shutdown_sent __read_mostly    = 300 SECS / 1000;
  66 static unsigned int ip_ct_sctp_timeout_shutdown_recd __read_mostly    = 300 SECS / 1000;
  67 static unsigned int ip_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  68
  69 static const unsigned int * sctp_timeouts[]
  70 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  71     &ip_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  72     &ip_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  73     &ip_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  74     &ip_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  75     &ip_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  76     &ip_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  77     &ip_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  78  };
  79
  80 #define sNO SCTP_CONNTRACK_NONE
  81 #define sCL SCTP_CONNTRACK_CLOSED
  82 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  83 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  84 #define sES SCTP_CONNTRACK_ESTABLISHED
  85 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  86 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  87 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  88 #define sIV SCTP_CONNTRACK_MAX
  89
  90 /*
  91         These are the descriptions of the states:
  92
  93 NOTE: These state names are tantalizingly similar to the states of an
  94 SCTP endpoint. But the interpretation of the states is a little different,
  95 considering that these are the states of the connection and not of an end
  96 point. Please note the subtleties. -Kiran
  97
  98 NONE              - Nothing so far.
  99 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
 100                     an INIT_ACK chunk in the reply direction.
 101 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 102 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 103 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 104 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 105 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 106                     to that of the SHUTDOWN chunk.
 107 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 108                     the SHUTDOWN chunk. Connection is closed.
 109 */
 110
 111 /* TODO
 112  - I have assumed that the first INIT is in the original direction.
 113  This messes things when an INIT comes in the reply direction in CLOSED
 114  state.
 115  - Check the error type in the reply dir before transitioning from
 116 cookie echoed to closed.
 117  - Sec 5.2.4 of RFC 2960
 118  - Multi Homing support.
 119 */
 120
 121 /* SCTP conntrack state transitions */
 122 static const enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 123         {
 124 /*      ORIGINAL        */
 125 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 126 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 127 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 128 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 129 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 130 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 131 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 132 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 133 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 134 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 135         },
 136         {
 137 /*      REPLY   */
 138 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 139 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 140 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 141 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 142 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 143 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 144 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 145 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 146 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 147 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 148         }
 149 };
 150
 151 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 152                              unsigned int dataoff,
 153                              struct ip_conntrack_tuple *tuple)
 154 {
 155         sctp_sctphdr_t _hdr, *hp;
 156
 157         DEBUGP(__FUNCTION__);
 158         DEBUGP("\n");
 159
 160         /* Actually only need first 8 bytes. */
 161         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 162         if (hp == NULL)
 163                 return 0;
 164
 165         tuple->src.u.sctp.port = hp->source;
 166         tuple->dst.u.sctp.port = hp->dest;
 167         return 1;
 168 }
 169
 170 static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
 171                              const struct ip_conntrack_tuple *orig)
 172 {
 173         DEBUGP(__FUNCTION__);
 174         DEBUGP("\n");
 175
 176         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 177         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 178         return 1;
 179 }
 180
 181 /* Print out the per-protocol part of the tuple. */
 182 static int sctp_print_tuple(struct seq_file *s,
 183                             const struct ip_conntrack_tuple *tuple)
 184 {
 185         DEBUGP(__FUNCTION__);
 186         DEBUGP("\n");
 187
 188         return seq_printf(s, "sport=%hu dport=%hu ",
 189                           ntohs(tuple->src.u.sctp.port),
 190                           ntohs(tuple->dst.u.sctp.port));
 191 }
 192
 193 /* Print out the private part of the conntrack. */
 194 static int sctp_print_conntrack(struct seq_file *s,
 195                                 const struct ip_conntrack *conntrack)
 196 {
 197         enum sctp_conntrack state;
 198
 199         DEBUGP(__FUNCTION__);
 200         DEBUGP("\n");
 201
 202         read_lock_bh(&sctp_lock);
 203         state = conntrack->proto.sctp.state;
 204         read_unlock_bh(&sctp_lock);
 205
 206         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 207 }
 208
 209 #define for_each_sctp_chunk(skb, sch, _sch, offset, count)              \
 210 for (offset = skb->nh.iph->ihl * 4 + sizeof(sctp_sctphdr_t), count = 0; \
 211         offset < skb->len &&                                            \
 212         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 213         offset += (ntohs(sch->length) + 3) & ~3, count++)
 214
 215 /* Some validity checks to make sure the chunks are fine */
 216 static int do_basic_checks(struct ip_conntrack *conntrack,
 217                            const struct sk_buff *skb,
 218                            char *map)
 219 {
 220         u_int32_t offset, count;
 221         sctp_chunkhdr_t _sch, *sch;
 222         int flag;
 223
 224         DEBUGP(__FUNCTION__);
 225         DEBUGP("\n");
 226
 227         flag = 0;
 228
 229         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 230                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 231
 232                 if (sch->type == SCTP_CID_INIT
 233                         || sch->type == SCTP_CID_INIT_ACK
 234                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 235                         flag = 1;
 236                 }
 237
 238                 /*
 239                  * Cookie Ack/Echo chunks not the first OR
 240                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 241                  * OR zero-length.
 242                  */
 243                 if (((sch->type == SCTP_CID_COOKIE_ACK
 244                         || sch->type == SCTP_CID_COOKIE_ECHO
 245                         || flag)
 246                       && count !=0) || !sch->length) {
 247                         DEBUGP("Basic checks failed\n");
 248                         return 1;
 249                 }
 250
 251                 if (map) {
 252                         set_bit(sch->type, (void *)map);
 253                 }
 254         }
 255
 256         DEBUGP("Basic checks passed\n");
 257         return count == 0;
 258 }
 259
 260 static int new_state(enum ip_conntrack_dir dir,
 261                      enum sctp_conntrack cur_state,
 262                      int chunk_type)
 263 {
 264         int i;
 265
 266         DEBUGP(__FUNCTION__);
 267         DEBUGP("\n");
 268
 269         DEBUGP("Chunk type: %d\n", chunk_type);
 270
 271         switch (chunk_type) {
 272                 case SCTP_CID_INIT:
 273                         DEBUGP("SCTP_CID_INIT\n");
 274                         i = 0; break;
 275                 case SCTP_CID_INIT_ACK:
 276                         DEBUGP("SCTP_CID_INIT_ACK\n");
 277                         i = 1; break;
 278                 case SCTP_CID_ABORT:
 279                         DEBUGP("SCTP_CID_ABORT\n");
 280                         i = 2; break;
 281                 case SCTP_CID_SHUTDOWN:
 282                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 283                         i = 3; break;
 284                 case SCTP_CID_SHUTDOWN_ACK:
 285                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 286                         i = 4; break;
 287                 case SCTP_CID_ERROR:
 288                         DEBUGP("SCTP_CID_ERROR\n");
 289                         i = 5; break;
 290                 case SCTP_CID_COOKIE_ECHO:
 291                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 292                         i = 6; break;
 293                 case SCTP_CID_COOKIE_ACK:
 294                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 295                         i = 7; break;
 296                 case SCTP_CID_SHUTDOWN_COMPLETE:
 297                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 298                         i = 8; break;
 299                 default:
 300                         /* Other chunks like DATA, SACK, HEARTBEAT and
 301                         its ACK do not cause a change in state */
 302                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 303                                                 sctp_conntrack_names[cur_state]);
 304                         return cur_state;
 305         }
 306
 307         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 308                         dir, sctp_conntrack_names[cur_state], chunk_type,
 309                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 310
 311         return sctp_conntracks[dir][i][cur_state];
 312 }
 313
 314 /* Returns verdict for packet, or -1 for invalid. */
 315 static int sctp_packet(struct ip_conntrack *conntrack,
 316                        const struct sk_buff *skb,
 317                        enum ip_conntrack_info ctinfo)
 318 {
 319         enum sctp_conntrack newconntrack, oldsctpstate;
 320         struct iphdr *iph = skb->nh.iph;
 321         sctp_sctphdr_t _sctph, *sh;
 322         sctp_chunkhdr_t _sch, *sch;
 323         u_int32_t offset, count;
 324         char map[256 / sizeof (char)] = {0};
 325
 326         DEBUGP(__FUNCTION__);
 327         DEBUGP("\n");
 328
 329         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 330         if (sh == NULL)
 331                 return -1;
 332
 333         if (do_basic_checks(conntrack, skb, map) != 0)
 334                 return -1;
 335
 336         /* Check the verification tag (Sec 8.5) */
 337         if (!test_bit(SCTP_CID_INIT, (void *)map)
 338                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 339                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 340                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 341                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 342                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 343                 DEBUGP("Verification tag check failed\n");
 344                 return -1;
 345         }
 346
 347         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 348         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 349                 write_lock_bh(&sctp_lock);
 350
 351                 /* Special cases of Verification tag check (Sec 8.5.1) */
 352                 if (sch->type == SCTP_CID_INIT) {
 353                         /* Sec 8.5.1 (A) */
 354                         if (sh->vtag != 0) {
 355                                 write_unlock_bh(&sctp_lock);
 356                                 return -1;
 357                         }
 358                 } else if (sch->type == SCTP_CID_ABORT) {
 359                         /* Sec 8.5.1 (B) */
 360                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 361                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 362                                                         [1 - CTINFO2DIR(ctinfo)])) {
 363                                 write_unlock_bh(&sctp_lock);
 364                                 return -1;
 365                         }
 366                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 367                         /* Sec 8.5.1 (C) */
 368                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 369                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 370                                                         [1 - CTINFO2DIR(ctinfo)]
 371                                         && (sch->flags & 1))) {
 372                                 write_unlock_bh(&sctp_lock);
 373                                 return -1;
 374                         }
 375                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 376                         /* Sec 8.5.1 (D) */
 377                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 378                                 write_unlock_bh(&sctp_lock);
 379                                 return -1;
 380                         }
 381                 }
 382
 383                 oldsctpstate = conntrack->proto.sctp.state;
 384                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 385
 386                 /* Invalid */
 387                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 388                         DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 389                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 390                         write_unlock_bh(&sctp_lock);
 391                         return -1;
 392                 }
 393
 394                 /* If it is an INIT or an INIT ACK note down the vtag */
 395                 if (sch->type == SCTP_CID_INIT
 396                         || sch->type == SCTP_CID_INIT_ACK) {
 397                         sctp_inithdr_t _inithdr, *ih;
 398
 399                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 400                                                 sizeof(_inithdr), &_inithdr);
 401                         if (ih == NULL) {
 402                                         write_unlock_bh(&sctp_lock);
 403                                         return -1;
 404                         }
 405                         DEBUGP("Setting vtag %x for dir %d\n",
 406                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 407                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 408                 }
 409
 410                 conntrack->proto.sctp.state = newconntrack;
 411                 if (oldsctpstate != newconntrack)
 412                         ip_conntrack_event_cache(IPCT_PROTOINFO, skb);
 413                 write_unlock_bh(&sctp_lock);
 414         }
 415
 416         ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 417
 418         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 419                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 420                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 421                 DEBUGP("Setting assured bit\n");
 422                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 423                 ip_conntrack_event_cache(IPCT_STATUS, skb);
 424         }
 425
 426         return NF_ACCEPT;
 427 }
 428
 429 /* Called when a new connection for this protocol found. */
 430 static int sctp_new(struct ip_conntrack *conntrack,
 431                     const struct sk_buff *skb)
 432 {
 433         enum sctp_conntrack newconntrack;
 434         struct iphdr *iph = skb->nh.iph;
 435         sctp_sctphdr_t _sctph, *sh;
 436         sctp_chunkhdr_t _sch, *sch;
 437         u_int32_t offset, count;
 438         char map[256 / sizeof (char)] = {0};
 439
 440         DEBUGP(__FUNCTION__);
 441         DEBUGP("\n");
 442
 443         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 444         if (sh == NULL)
 445                 return 0;
 446
 447         if (do_basic_checks(conntrack, skb, map) != 0)
 448                 return 0;
 449
 450         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 451         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 452                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 453                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 454                 return 0;
 455         }
 456
 457         newconntrack = SCTP_CONNTRACK_MAX;
 458         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 459                 /* Don't need lock here: this conntrack not in circulation yet */
 460                 newconntrack = new_state (IP_CT_DIR_ORIGINAL,
 461                                                 SCTP_CONNTRACK_NONE, sch->type);
 462
 463                 /* Invalid: delete conntrack */
 464                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 465                         DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
 466                         return 0;
 467                 }
 468
 469                 /* Copy the vtag into the state info */
 470                 if (sch->type == SCTP_CID_INIT) {
 471                         if (sh->vtag == 0) {
 472                                 sctp_inithdr_t _inithdr, *ih;
 473
 474                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 475                                                         sizeof(_inithdr), &_inithdr);
 476                                 if (ih == NULL)
 477                                         return 0;
 478
 479                                 DEBUGP("Setting vtag %x for new conn\n",
 480                                         ih->init_tag);
 481
 482                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 483                                                                 ih->init_tag;
 484                         } else {
 485                                 /* Sec 8.5.1 (A) */
 486                                 return 0;
 487                         }
 488                 }
 489                 /* If it is a shutdown ack OOTB packet, we expect a return
 490                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 491                 else {
 492                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 493                                 sh->vtag);
 494                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 495                 }
 496
 497                 conntrack->proto.sctp.state = newconntrack;
 498         }
 499
 500         return 1;
 501 }
 502
 503 static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
 504         .proto           = IPPROTO_SCTP,
 505         .name            = "sctp",
 506         .pkt_to_tuple    = sctp_pkt_to_tuple,
 507         .invert_tuple    = sctp_invert_tuple,
 508         .print_tuple     = sctp_print_tuple,
 509         .print_conntrack = sctp_print_conntrack,
 510         .packet          = sctp_packet,
 511         .new             = sctp_new,
 512         .destroy         = NULL,
 513         .me              = THIS_MODULE,
 514 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 515     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 516         .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
 517         .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
 518 #endif
 519 };
 520
 521 #ifdef CONFIG_SYSCTL
 522 static ctl_table ip_ct_sysctl_table[] = {
 523         {
 524                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 525                 .procname       = "ip_conntrack_sctp_timeout_closed",
 526                 .data           = &ip_ct_sctp_timeout_closed,
 527                 .maxlen         = sizeof(unsigned int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec_jiffies,
 530         },
 531         {
 532                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 533                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 534                 .data           = &ip_ct_sctp_timeout_cookie_wait,
 535                 .maxlen         = sizeof(unsigned int),
 536                 .mode           = 0644,
 537                 .proc_handler   = &proc_dointvec_jiffies,
 538         },
 539         {
 540                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 541                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 542                 .data           = &ip_ct_sctp_timeout_cookie_echoed,
 543                 .maxlen         = sizeof(unsigned int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec_jiffies,
 546         },
 547         {
 548                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 549                 .procname       = "ip_conntrack_sctp_timeout_established",
 550                 .data           = &ip_ct_sctp_timeout_established,
 551                 .maxlen         = sizeof(unsigned int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_jiffies,
 554         },
 555         {
 556                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 557                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 558                 .data           = &ip_ct_sctp_timeout_shutdown_sent,
 559                 .maxlen         = sizeof(unsigned int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_jiffies,
 562         },
 563         {
 564                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 565                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 566                 .data           = &ip_ct_sctp_timeout_shutdown_recd,
 567                 .maxlen         = sizeof(unsigned int),
 568                 .mode           = 0644,
 569                 .proc_handler   = &proc_dointvec_jiffies,
 570         },
 571         {
 572                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 573                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 574                 .data           = &ip_ct_sctp_timeout_shutdown_ack_sent,
 575                 .maxlen         = sizeof(unsigned int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_jiffies,
 578         },
 579         { .ctl_name = 0 }
 580 };
 581
 582 static ctl_table ip_ct_netfilter_table[] = {
 583         {
 584                 .ctl_name       = NET_IPV4_NETFILTER,
 585                 .procname       = "netfilter",
 586                 .mode           = 0555,
 587                 .child          = ip_ct_sysctl_table,
 588         },
 589         { .ctl_name = 0 }
 590 };
 591
 592 static ctl_table ip_ct_ipv4_table[] = {
 593         {
 594                 .ctl_name       = NET_IPV4,
 595                 .procname       = "ipv4",
 596                 .mode           = 0555,
 597                 .child          = ip_ct_netfilter_table,
 598         },
 599         { .ctl_name = 0 }
 600 };
 601
 602 static ctl_table ip_ct_net_table[] = {
 603         {
 604                 .ctl_name       = CTL_NET,
 605                 .procname       = "net",
 606                 .mode           = 0555,
 607                 .child          = ip_ct_ipv4_table,
 608         },
 609         { .ctl_name = 0 }
 610 };
 611
 612 static struct ctl_table_header *ip_ct_sysctl_header;
 613 #endif
 614
 615 static int __init ip_conntrack_proto_sctp_init(void)
 616 {
 617         int ret;
 618
 619         ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
 620         if (ret) {
 621                 printk("ip_conntrack_proto_sctp: protocol register failed\n");
 622                 goto out;
 623         }
 624
 625 #ifdef CONFIG_SYSCTL
 626         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 627         if (ip_ct_sysctl_header == NULL) {
 628                 ret = -ENOMEM;
 629                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
 630                 goto cleanup;
 631         }
 632 #endif
 633
 634         return ret;
 635
 636 #ifdef CONFIG_SYSCTL
 637  cleanup:
 638         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 639 #endif
 640  out:
 641         DEBUGP("SCTP conntrack module loading %s\n",
 642                                         ret ? "failed": "succeeded");
 643         return ret;
 644 }
 645
 646 static void __exit ip_conntrack_proto_sctp_fini(void)
 647 {
 648         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 649 #ifdef CONFIG_SYSCTL
 650         unregister_sysctl_table(ip_ct_sysctl_header);
 651 #endif
 652         DEBUGP("SCTP conntrack module unloaded\n");
 653 }
 654
 655 module_init(ip_conntrack_proto_sctp_init);
 656 module_exit(ip_conntrack_proto_sctp_fini);
 657
 658 MODULE_LICENSE("GPL");
 659 MODULE_AUTHOR("Kiran Kumar Immidi");
 660 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");