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