net/netfilter/nf_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  * 17 Oct 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  12  *      - enable working with L3 protocol independent connection tracking.
  13  *
  14  * Derived from net/ipv4/ip_conntrack_sctp.c
  15  */
  16
  17 /*
  18  * Added support for proc manipulation of timeouts.
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/sched.h>
  23 #include <linux/timer.h>
  24 #include <linux/netfilter.h>
  25 #include <linux/module.h>
  26 #include <linux/in.h>
  27 #include <linux/ip.h>
  28 #include <linux/sctp.h>
  29 #include <linux/string.h>
  30 #include <linux/seq_file.h>
  31
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_protocol.h>
  34
  35 #if 0
  36 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  37 #else
  38 #define DEBUGP(format, args...)
  39 #endif
  40
  41 /* Protects conntrack->proto.sctp */
  42 static DEFINE_RWLOCK(sctp_lock);
  43
  44 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  45    closely.  They're more complex. --RR
  46
  47    And so for me for SCTP :D -Kiran */
  48
  49 static const char *sctp_conntrack_names[] = {
  50         "NONE",
  51         "CLOSED",
  52         "COOKIE_WAIT",
  53         "COOKIE_ECHOED",
  54         "ESTABLISHED",
  55         "SHUTDOWN_SENT",
  56         "SHUTDOWN_RECD",
  57         "SHUTDOWN_ACK_SENT",
  58 };
  59
  60 #define SECS  * HZ
  61 #define MINS  * 60 SECS
  62 #define HOURS * 60 MINS
  63 #define DAYS  * 24 HOURS
  64
  65 static unsigned int nf_ct_sctp_timeout_closed            =  10 SECS;
  66 static unsigned int nf_ct_sctp_timeout_cookie_wait       =   3 SECS;
  67 static unsigned int nf_ct_sctp_timeout_cookie_echoed     =   3 SECS;
  68 static unsigned int nf_ct_sctp_timeout_established       =   5 DAYS;
  69 static unsigned int nf_ct_sctp_timeout_shutdown_sent     = 300 SECS / 1000;
  70 static unsigned int nf_ct_sctp_timeout_shutdown_recd     = 300 SECS / 1000;
  71 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent =   3 SECS;
  72
  73 static unsigned int * sctp_timeouts[]
  74 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  75     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  76     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  77     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  78     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  79     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  80     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  81     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  82  };
  83
  84 #define sNO SCTP_CONNTRACK_NONE
  85 #define sCL SCTP_CONNTRACK_CLOSED
  86 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  87 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  88 #define sES SCTP_CONNTRACK_ESTABLISHED
  89 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  90 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  91 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  92 #define sIV SCTP_CONNTRACK_MAX
  93
  94 /*
  95         These are the descriptions of the states:
  96
  97 NOTE: These state names are tantalizingly similar to the states of an
  98 SCTP endpoint. But the interpretation of the states is a little different,
  99 considering that these are the states of the connection and not of an end
 100 point. Please note the subtleties. -Kiran
 101
 102 NONE              - Nothing so far.
 103 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
 104                     an INIT_ACK chunk in the reply direction.
 105 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 106 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 107 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 108 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 109 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 110                     to that of the SHUTDOWN chunk.
 111 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 112                     the SHUTDOWN chunk. Connection is closed.
 113 */
 114
 115 /* TODO
 116  - I have assumed that the first INIT is in the original direction.
 117  This messes things when an INIT comes in the reply direction in CLOSED
 118  state.
 119  - Check the error type in the reply dir before transitioning from
 120 cookie echoed to closed.
 121  - Sec 5.2.4 of RFC 2960
 122  - Multi Homing support.
 123 */
 124
 125 /* SCTP conntrack state transitions */
 126 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 127         {
 128 /*      ORIGINAL        */
 129 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 130 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 131 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 132 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 133 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 134 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 135 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 136 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 137 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 138 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 139         },
 140         {
 141 /*      REPLY   */
 142 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 143 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 144 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 145 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 146 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 147 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 148 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 149 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 150 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 151 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 152         }
 153 };
 154
 155 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 156                              unsigned int dataoff,
 157                              struct nf_conntrack_tuple *tuple)
 158 {
 159         sctp_sctphdr_t _hdr, *hp;
 160
 161         DEBUGP(__FUNCTION__);
 162         DEBUGP("\n");
 163
 164         /* Actually only need first 8 bytes. */
 165         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 166         if (hp == NULL)
 167                 return 0;
 168
 169         tuple->src.u.sctp.port = hp->source;
 170         tuple->dst.u.sctp.port = hp->dest;
 171         return 1;
 172 }
 173
 174 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 175                              const struct nf_conntrack_tuple *orig)
 176 {
 177         DEBUGP(__FUNCTION__);
 178         DEBUGP("\n");
 179
 180         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 181         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 182         return 1;
 183 }
 184
 185 /* Print out the per-protocol part of the tuple. */
 186 static int sctp_print_tuple(struct seq_file *s,
 187                             const struct nf_conntrack_tuple *tuple)
 188 {
 189         DEBUGP(__FUNCTION__);
 190         DEBUGP("\n");
 191
 192         return seq_printf(s, "sport=%hu dport=%hu ",
 193                           ntohs(tuple->src.u.sctp.port),
 194                           ntohs(tuple->dst.u.sctp.port));
 195 }
 196
 197 /* Print out the private part of the conntrack. */
 198 static int sctp_print_conntrack(struct seq_file *s,
 199                                 const struct nf_conn *conntrack)
 200 {
 201         enum sctp_conntrack state;
 202
 203         DEBUGP(__FUNCTION__);
 204         DEBUGP("\n");
 205
 206         read_lock_bh(&sctp_lock);
 207         state = conntrack->proto.sctp.state;
 208         read_unlock_bh(&sctp_lock);
 209
 210         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 211 }
 212
 213 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 214 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
 215         offset < skb->len &&                                            \
 216         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 217         offset += (htons(sch->length) + 3) & ~3, count++)
 218
 219 /* Some validity checks to make sure the chunks are fine */
 220 static int do_basic_checks(struct nf_conn *conntrack,
 221                            const struct sk_buff *skb,
 222                            unsigned int dataoff,
 223                            char *map)
 224 {
 225         u_int32_t offset, count;
 226         sctp_chunkhdr_t _sch, *sch;
 227         int flag;
 228
 229         DEBUGP(__FUNCTION__);
 230         DEBUGP("\n");
 231
 232         flag = 0;
 233
 234         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 235                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 236
 237                 if (sch->type == SCTP_CID_INIT
 238                         || sch->type == SCTP_CID_INIT_ACK
 239                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 240                         flag = 1;
 241                 }
 242
 243                 /* Cookie Ack/Echo chunks not the first OR
 244                    Init / Init Ack / Shutdown compl chunks not the only chunks */
 245                 if ((sch->type == SCTP_CID_COOKIE_ACK
 246                         || sch->type == SCTP_CID_COOKIE_ECHO
 247                         || flag)
 248                      && count !=0 ) {
 249                         DEBUGP("Basic checks failed\n");
 250                         return 1;
 251                 }
 252
 253                 if (map) {
 254                         set_bit(sch->type, (void *)map);
 255                 }
 256         }
 257
 258         DEBUGP("Basic checks passed\n");
 259         return 0;
 260 }
 261
 262 static int new_state(enum ip_conntrack_dir dir,
 263                      enum sctp_conntrack cur_state,
 264                      int chunk_type)
 265 {
 266         int i;
 267
 268         DEBUGP(__FUNCTION__);
 269         DEBUGP("\n");
 270
 271         DEBUGP("Chunk type: %d\n", chunk_type);
 272
 273         switch (chunk_type) {
 274                 case SCTP_CID_INIT:
 275                         DEBUGP("SCTP_CID_INIT\n");
 276                         i = 0; break;
 277                 case SCTP_CID_INIT_ACK:
 278                         DEBUGP("SCTP_CID_INIT_ACK\n");
 279                         i = 1; break;
 280                 case SCTP_CID_ABORT:
 281                         DEBUGP("SCTP_CID_ABORT\n");
 282                         i = 2; break;
 283                 case SCTP_CID_SHUTDOWN:
 284                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 285                         i = 3; break;
 286                 case SCTP_CID_SHUTDOWN_ACK:
 287                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 288                         i = 4; break;
 289                 case SCTP_CID_ERROR:
 290                         DEBUGP("SCTP_CID_ERROR\n");
 291                         i = 5; break;
 292                 case SCTP_CID_COOKIE_ECHO:
 293                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 294                         i = 6; break;
 295                 case SCTP_CID_COOKIE_ACK:
 296                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 297                         i = 7; break;
 298                 case SCTP_CID_SHUTDOWN_COMPLETE:
 299                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 300                         i = 8; break;
 301                 default:
 302                         /* Other chunks like DATA, SACK, HEARTBEAT and
 303                         its ACK do not cause a change in state */
 304                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 305                                                 sctp_conntrack_names[cur_state]);
 306                         return cur_state;
 307         }
 308
 309         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 310                         dir, sctp_conntrack_names[cur_state], chunk_type,
 311                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 312
 313         return sctp_conntracks[dir][i][cur_state];
 314 }
 315
 316 /* Returns verdict for packet, or -1 for invalid. */
 317 static int sctp_packet(struct nf_conn *conntrack,
 318                        const struct sk_buff *skb,
 319                        unsigned int dataoff,
 320                        enum ip_conntrack_info ctinfo,
 321                        int pf,
 322                        unsigned int hooknum)
 323 {
 324         enum sctp_conntrack newconntrack, oldsctpstate;
 325         sctp_sctphdr_t _sctph, *sh;
 326         sctp_chunkhdr_t _sch, *sch;
 327         u_int32_t offset, count;
 328         char map[256 / sizeof (char)] = {0};
 329
 330         DEBUGP(__FUNCTION__);
 331         DEBUGP("\n");
 332
 333         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 334         if (sh == NULL)
 335                 return -1;
 336
 337         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 338                 return -1;
 339
 340         /* Check the verification tag (Sec 8.5) */
 341         if (!test_bit(SCTP_CID_INIT, (void *)map)
 342                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 343                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 344                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 345                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 346                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 347                 DEBUGP("Verification tag check failed\n");
 348                 return -1;
 349         }
 350
 351         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 352         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 353                 write_lock_bh(&sctp_lock);
 354
 355                 /* Special cases of Verification tag check (Sec 8.5.1) */
 356                 if (sch->type == SCTP_CID_INIT) {
 357                         /* Sec 8.5.1 (A) */
 358                         if (sh->vtag != 0) {
 359                                 write_unlock_bh(&sctp_lock);
 360                                 return -1;
 361                         }
 362                 } else if (sch->type == SCTP_CID_ABORT) {
 363                         /* Sec 8.5.1 (B) */
 364                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 365                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 366                                                         [1 - CTINFO2DIR(ctinfo)])) {
 367                                 write_unlock_bh(&sctp_lock);
 368                                 return -1;
 369                         }
 370                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 371                         /* Sec 8.5.1 (C) */
 372                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 373                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 374                                                         [1 - CTINFO2DIR(ctinfo)]
 375                                         && (sch->flags & 1))) {
 376                                 write_unlock_bh(&sctp_lock);
 377                                 return -1;
 378                         }
 379                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 380                         /* Sec 8.5.1 (D) */
 381                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 382                                 write_unlock_bh(&sctp_lock);
 383                                 return -1;
 384                         }
 385                 }
 386
 387                 oldsctpstate = conntrack->proto.sctp.state;
 388                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 389
 390                 /* Invalid */
 391                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 392                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 393                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 394                         write_unlock_bh(&sctp_lock);
 395                         return -1;
 396                 }
 397
 398                 /* If it is an INIT or an INIT ACK note down the vtag */
 399                 if (sch->type == SCTP_CID_INIT
 400                         || sch->type == SCTP_CID_INIT_ACK) {
 401                         sctp_inithdr_t _inithdr, *ih;
 402
 403                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 404                                                 sizeof(_inithdr), &_inithdr);
 405                         if (ih == NULL) {
 406                                         write_unlock_bh(&sctp_lock);
 407                                         return -1;
 408                         }
 409                         DEBUGP("Setting vtag %x for dir %d\n",
 410                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 411                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 412                 }
 413
 414                 conntrack->proto.sctp.state = newconntrack;
 415                 if (oldsctpstate != newconntrack)
 416                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 417                 write_unlock_bh(&sctp_lock);
 418         }
 419
 420         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 421
 422         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 423                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 424                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 425                 DEBUGP("Setting assured bit\n");
 426                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 427                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 428         }
 429
 430         return NF_ACCEPT;
 431 }
 432
 433 /* Called when a new connection for this protocol found. */
 434 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 435                     unsigned int dataoff)
 436 {
 437         enum sctp_conntrack newconntrack;
 438         sctp_sctphdr_t _sctph, *sh;
 439         sctp_chunkhdr_t _sch, *sch;
 440         u_int32_t offset, count;
 441         char map[256 / sizeof (char)] = {0};
 442
 443         DEBUGP(__FUNCTION__);
 444         DEBUGP("\n");
 445
 446         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 447         if (sh == NULL)
 448                 return 0;
 449
 450         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 451                 return 0;
 452
 453         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 454         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 455                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 456                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 457                 return 0;
 458         }
 459
 460         newconntrack = SCTP_CONNTRACK_MAX;
 461         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 462                 /* Don't need lock here: this conntrack not in circulation yet */
 463                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 464                                          SCTP_CONNTRACK_NONE, sch->type);
 465
 466                 /* Invalid: delete conntrack */
 467                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 468                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
 469                         return 0;
 470                 }
 471
 472                 /* Copy the vtag into the state info */
 473                 if (sch->type == SCTP_CID_INIT) {
 474                         if (sh->vtag == 0) {
 475                                 sctp_inithdr_t _inithdr, *ih;
 476
 477                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 478                                                         sizeof(_inithdr), &_inithdr);
 479                                 if (ih == NULL)
 480                                         return 0;
 481
 482                                 DEBUGP("Setting vtag %x for new conn\n",
 483                                         ih->init_tag);
 484
 485                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 486                                                                 ih->init_tag;
 487                         } else {
 488                                 /* Sec 8.5.1 (A) */
 489                                 return 0;
 490                         }
 491                 }
 492                 /* If it is a shutdown ack OOTB packet, we expect a return
 493                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 494                 else {
 495                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 496                                 sh->vtag);
 497                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 498                 }
 499
 500                 conntrack->proto.sctp.state = newconntrack;
 501         }
 502
 503         return 1;
 504 }
 505
 506 struct nf_conntrack_protocol nf_conntrack_protocol_sctp4 = {
 507         .l3proto         = PF_INET,
 508         .proto           = IPPROTO_SCTP,
 509         .name            = "sctp",
 510         .pkt_to_tuple    = sctp_pkt_to_tuple,
 511         .invert_tuple    = sctp_invert_tuple,
 512         .print_tuple     = sctp_print_tuple,
 513         .print_conntrack = sctp_print_conntrack,
 514         .packet          = sctp_packet,
 515         .new             = sctp_new,
 516         .destroy         = NULL,
 517         .me              = THIS_MODULE
 518 };
 519
 520 struct nf_conntrack_protocol nf_conntrack_protocol_sctp6 = {
 521         .l3proto         = PF_INET6,
 522         .proto           = IPPROTO_SCTP,
 523         .name            = "sctp",
 524         .pkt_to_tuple    = sctp_pkt_to_tuple,
 525         .invert_tuple    = sctp_invert_tuple,
 526         .print_tuple     = sctp_print_tuple,
 527         .print_conntrack = sctp_print_conntrack,
 528         .packet          = sctp_packet,
 529         .new             = sctp_new,
 530         .destroy         = NULL,
 531         .me              = THIS_MODULE
 532 };
 533
 534 #ifdef CONFIG_SYSCTL
 535 static ctl_table nf_ct_sysctl_table[] = {
 536         {
 537                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 538                 .procname       = "nf_conntrack_sctp_timeout_closed",
 539                 .data           = &nf_ct_sctp_timeout_closed,
 540                 .maxlen         = sizeof(unsigned int),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec_jiffies,
 543         },
 544         {
 545                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 546                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 547                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 548                 .maxlen         = sizeof(unsigned int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec_jiffies,
 551         },
 552         {
 553                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 554                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 555                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 556                 .maxlen         = sizeof(unsigned int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec_jiffies,
 559         },
 560         {
 561                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 562                 .procname       = "nf_conntrack_sctp_timeout_established",
 563                 .data           = &nf_ct_sctp_timeout_established,
 564                 .maxlen         = sizeof(unsigned int),
 565                 .mode           = 0644,
 566                 .proc_handler   = &proc_dointvec_jiffies,
 567         },
 568         {
 569                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 570                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 571                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 572                 .maxlen         = sizeof(unsigned int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec_jiffies,
 575         },
 576         {
 577                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 578                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 579                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 580                 .maxlen         = sizeof(unsigned int),
 581                 .mode           = 0644,
 582                 .proc_handler   = &proc_dointvec_jiffies,
 583         },
 584         {
 585                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 586                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 587                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 588                 .maxlen         = sizeof(unsigned int),
 589                 .mode           = 0644,
 590                 .proc_handler   = &proc_dointvec_jiffies,
 591         },
 592         { .ctl_name = 0 }
 593 };
 594
 595 static ctl_table nf_ct_netfilter_table[] = {
 596         {
 597                 .ctl_name       = NET_NETFILTER,
 598                 .procname       = "netfilter",
 599                 .mode           = 0555,
 600                 .child          = nf_ct_sysctl_table,
 601         },
 602         { .ctl_name = 0 }
 603 };
 604
 605 static ctl_table nf_ct_net_table[] = {
 606         {
 607                 .ctl_name       = CTL_NET,
 608                 .procname       = "net",
 609                 .mode           = 0555,
 610                 .child          = nf_ct_netfilter_table,
 611         },
 612         { .ctl_name = 0 }
 613 };
 614
 615 static struct ctl_table_header *nf_ct_sysctl_header;
 616 #endif
 617
 618 int __init init(void)
 619 {
 620         int ret;
 621
 622         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp4);
 623         if (ret) {
 624                 printk("nf_conntrack_proto_sctp4: protocol register failed\n");
 625                 goto out;
 626         }
 627         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp6);
 628         if (ret) {
 629                 printk("nf_conntrack_proto_sctp6: protocol register failed\n");
 630                 goto cleanup_sctp4;
 631         }
 632
 633 #ifdef CONFIG_SYSCTL
 634         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 635         if (nf_ct_sysctl_header == NULL) {
 636                 printk("nf_conntrack_proto_sctp: can't register to sysctl.\n");
 637                 goto cleanup;
 638         }
 639 #endif
 640
 641         return ret;
 642
 643 #ifdef CONFIG_SYSCTL
 644  cleanup:
 645         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 646 #endif
 647  cleanup_sctp4:
 648         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 649  out:
 650         DEBUGP("SCTP conntrack module loading %s\n",
 651                                         ret ? "failed": "succeeded");
 652         return ret;
 653 }
 654
 655 void __exit fini(void)
 656 {
 657         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 658         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 659 #ifdef CONFIG_SYSCTL
 660         unregister_sysctl_table(nf_ct_sysctl_header);
 661 #endif
 662         DEBUGP("SCTP conntrack module unloaded\n");
 663 }
 664
 665 module_init(init);
 666 module_exit(fini);
 667
 668 MODULE_LICENSE("GPL");
 669 MODULE_AUTHOR("Kiran Kumar Immidi");
 670 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");