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                 /*
 244                  * Cookie Ack/Echo chunks not the first OR
 245                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 246                  * OR zero-length.
 247                  */
 248                 if (((sch->type == SCTP_CID_COOKIE_ACK
 249                         || sch->type == SCTP_CID_COOKIE_ECHO
 250                         || flag)
 251                       && count !=0) || !sch->length) {
 252                         DEBUGP("Basic checks failed\n");
 253                         return 1;
 254                 }
 255
 256                 if (map) {
 257                         set_bit(sch->type, (void *)map);
 258                 }
 259         }
 260
 261         DEBUGP("Basic checks passed\n");
 262         return count == 0;
 263 }
 264
 265 static int new_state(enum ip_conntrack_dir dir,
 266                      enum sctp_conntrack cur_state,
 267                      int chunk_type)
 268 {
 269         int i;
 270
 271         DEBUGP(__FUNCTION__);
 272         DEBUGP("\n");
 273
 274         DEBUGP("Chunk type: %d\n", chunk_type);
 275
 276         switch (chunk_type) {
 277                 case SCTP_CID_INIT:
 278                         DEBUGP("SCTP_CID_INIT\n");
 279                         i = 0; break;
 280                 case SCTP_CID_INIT_ACK:
 281                         DEBUGP("SCTP_CID_INIT_ACK\n");
 282                         i = 1; break;
 283                 case SCTP_CID_ABORT:
 284                         DEBUGP("SCTP_CID_ABORT\n");
 285                         i = 2; break;
 286                 case SCTP_CID_SHUTDOWN:
 287                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 288                         i = 3; break;
 289                 case SCTP_CID_SHUTDOWN_ACK:
 290                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 291                         i = 4; break;
 292                 case SCTP_CID_ERROR:
 293                         DEBUGP("SCTP_CID_ERROR\n");
 294                         i = 5; break;
 295                 case SCTP_CID_COOKIE_ECHO:
 296                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 297                         i = 6; break;
 298                 case SCTP_CID_COOKIE_ACK:
 299                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 300                         i = 7; break;
 301                 case SCTP_CID_SHUTDOWN_COMPLETE:
 302                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 303                         i = 8; break;
 304                 default:
 305                         /* Other chunks like DATA, SACK, HEARTBEAT and
 306                         its ACK do not cause a change in state */
 307                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 308                                                 sctp_conntrack_names[cur_state]);
 309                         return cur_state;
 310         }
 311
 312         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 313                         dir, sctp_conntrack_names[cur_state], chunk_type,
 314                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 315
 316         return sctp_conntracks[dir][i][cur_state];
 317 }
 318
 319 /* Returns verdict for packet, or -1 for invalid. */
 320 static int sctp_packet(struct nf_conn *conntrack,
 321                        const struct sk_buff *skb,
 322                        unsigned int dataoff,
 323                        enum ip_conntrack_info ctinfo,
 324                        int pf,
 325                        unsigned int hooknum)
 326 {
 327         enum sctp_conntrack newconntrack, oldsctpstate;
 328         sctp_sctphdr_t _sctph, *sh;
 329         sctp_chunkhdr_t _sch, *sch;
 330         u_int32_t offset, count;
 331         char map[256 / sizeof (char)] = {0};
 332
 333         DEBUGP(__FUNCTION__);
 334         DEBUGP("\n");
 335
 336         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 337         if (sh == NULL)
 338                 return -1;
 339
 340         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 341                 return -1;
 342
 343         /* Check the verification tag (Sec 8.5) */
 344         if (!test_bit(SCTP_CID_INIT, (void *)map)
 345                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 346                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 347                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 348                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 349                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 350                 DEBUGP("Verification tag check failed\n");
 351                 return -1;
 352         }
 353
 354         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 355         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 356                 write_lock_bh(&sctp_lock);
 357
 358                 /* Special cases of Verification tag check (Sec 8.5.1) */
 359                 if (sch->type == SCTP_CID_INIT) {
 360                         /* Sec 8.5.1 (A) */
 361                         if (sh->vtag != 0) {
 362                                 write_unlock_bh(&sctp_lock);
 363                                 return -1;
 364                         }
 365                 } else if (sch->type == SCTP_CID_ABORT) {
 366                         /* Sec 8.5.1 (B) */
 367                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 368                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 369                                                         [1 - CTINFO2DIR(ctinfo)])) {
 370                                 write_unlock_bh(&sctp_lock);
 371                                 return -1;
 372                         }
 373                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 374                         /* Sec 8.5.1 (C) */
 375                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 376                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 377                                                         [1 - CTINFO2DIR(ctinfo)]
 378                                         && (sch->flags & 1))) {
 379                                 write_unlock_bh(&sctp_lock);
 380                                 return -1;
 381                         }
 382                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 383                         /* Sec 8.5.1 (D) */
 384                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 385                                 write_unlock_bh(&sctp_lock);
 386                                 return -1;
 387                         }
 388                 }
 389
 390                 oldsctpstate = conntrack->proto.sctp.state;
 391                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 392
 393                 /* Invalid */
 394                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 395                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 396                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 397                         write_unlock_bh(&sctp_lock);
 398                         return -1;
 399                 }
 400
 401                 /* If it is an INIT or an INIT ACK note down the vtag */
 402                 if (sch->type == SCTP_CID_INIT
 403                         || sch->type == SCTP_CID_INIT_ACK) {
 404                         sctp_inithdr_t _inithdr, *ih;
 405
 406                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 407                                                 sizeof(_inithdr), &_inithdr);
 408                         if (ih == NULL) {
 409                                         write_unlock_bh(&sctp_lock);
 410                                         return -1;
 411                         }
 412                         DEBUGP("Setting vtag %x for dir %d\n",
 413                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 414                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 415                 }
 416
 417                 conntrack->proto.sctp.state = newconntrack;
 418                 if (oldsctpstate != newconntrack)
 419                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 420                 write_unlock_bh(&sctp_lock);
 421         }
 422
 423         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 424
 425         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 426                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 427                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 428                 DEBUGP("Setting assured bit\n");
 429                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 430                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 431         }
 432
 433         return NF_ACCEPT;
 434 }
 435
 436 /* Called when a new connection for this protocol found. */
 437 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 438                     unsigned int dataoff)
 439 {
 440         enum sctp_conntrack newconntrack;
 441         sctp_sctphdr_t _sctph, *sh;
 442         sctp_chunkhdr_t _sch, *sch;
 443         u_int32_t offset, count;
 444         char map[256 / sizeof (char)] = {0};
 445
 446         DEBUGP(__FUNCTION__);
 447         DEBUGP("\n");
 448
 449         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 450         if (sh == NULL)
 451                 return 0;
 452
 453         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 454                 return 0;
 455
 456         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 457         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 458                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 459                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 460                 return 0;
 461         }
 462
 463         newconntrack = SCTP_CONNTRACK_MAX;
 464         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 465                 /* Don't need lock here: this conntrack not in circulation yet */
 466                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 467                                          SCTP_CONNTRACK_NONE, sch->type);
 468
 469                 /* Invalid: delete conntrack */
 470                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 471                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
 472                         return 0;
 473                 }
 474
 475                 /* Copy the vtag into the state info */
 476                 if (sch->type == SCTP_CID_INIT) {
 477                         if (sh->vtag == 0) {
 478                                 sctp_inithdr_t _inithdr, *ih;
 479
 480                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 481                                                         sizeof(_inithdr), &_inithdr);
 482                                 if (ih == NULL)
 483                                         return 0;
 484
 485                                 DEBUGP("Setting vtag %x for new conn\n",
 486                                         ih->init_tag);
 487
 488                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 489                                                                 ih->init_tag;
 490                         } else {
 491                                 /* Sec 8.5.1 (A) */
 492                                 return 0;
 493                         }
 494                 }
 495                 /* If it is a shutdown ack OOTB packet, we expect a return
 496                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 497                 else {
 498                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 499                                 sh->vtag);
 500                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 501                 }
 502
 503                 conntrack->proto.sctp.state = newconntrack;
 504         }
 505
 506         return 1;
 507 }
 508
 509 struct nf_conntrack_protocol nf_conntrack_protocol_sctp4 = {
 510         .l3proto         = PF_INET,
 511         .proto           = IPPROTO_SCTP,
 512         .name            = "sctp",
 513         .pkt_to_tuple    = sctp_pkt_to_tuple,
 514         .invert_tuple    = sctp_invert_tuple,
 515         .print_tuple     = sctp_print_tuple,
 516         .print_conntrack = sctp_print_conntrack,
 517         .packet          = sctp_packet,
 518         .new             = sctp_new,
 519         .destroy         = NULL,
 520         .me              = THIS_MODULE
 521 };
 522
 523 struct nf_conntrack_protocol nf_conntrack_protocol_sctp6 = {
 524         .l3proto         = PF_INET6,
 525         .proto           = IPPROTO_SCTP,
 526         .name            = "sctp",
 527         .pkt_to_tuple    = sctp_pkt_to_tuple,
 528         .invert_tuple    = sctp_invert_tuple,
 529         .print_tuple     = sctp_print_tuple,
 530         .print_conntrack = sctp_print_conntrack,
 531         .packet          = sctp_packet,
 532         .new             = sctp_new,
 533         .destroy         = NULL,
 534         .me              = THIS_MODULE
 535 };
 536
 537 #ifdef CONFIG_SYSCTL
 538 static ctl_table nf_ct_sysctl_table[] = {
 539         {
 540                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 541                 .procname       = "nf_conntrack_sctp_timeout_closed",
 542                 .data           = &nf_ct_sctp_timeout_closed,
 543                 .maxlen         = sizeof(unsigned int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec_jiffies,
 546         },
 547         {
 548                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 549                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 550                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 551                 .maxlen         = sizeof(unsigned int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_jiffies,
 554         },
 555         {
 556                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 557                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 558                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 559                 .maxlen         = sizeof(unsigned int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_jiffies,
 562         },
 563         {
 564                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 565                 .procname       = "nf_conntrack_sctp_timeout_established",
 566                 .data           = &nf_ct_sctp_timeout_established,
 567                 .maxlen         = sizeof(unsigned int),
 568                 .mode           = 0644,
 569                 .proc_handler   = &proc_dointvec_jiffies,
 570         },
 571         {
 572                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 573                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 574                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 575                 .maxlen         = sizeof(unsigned int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_jiffies,
 578         },
 579         {
 580                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 581                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 582                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 583                 .maxlen         = sizeof(unsigned int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_jiffies,
 586         },
 587         {
 588                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 589                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 590                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 591                 .maxlen         = sizeof(unsigned int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_jiffies,
 594         },
 595         { .ctl_name = 0 }
 596 };
 597
 598 static ctl_table nf_ct_netfilter_table[] = {
 599         {
 600                 .ctl_name       = NET_NETFILTER,
 601                 .procname       = "netfilter",
 602                 .mode           = 0555,
 603                 .child          = nf_ct_sysctl_table,
 604         },
 605         { .ctl_name = 0 }
 606 };
 607
 608 static ctl_table nf_ct_net_table[] = {
 609         {
 610                 .ctl_name       = CTL_NET,
 611                 .procname       = "net",
 612                 .mode           = 0555,
 613                 .child          = nf_ct_netfilter_table,
 614         },
 615         { .ctl_name = 0 }
 616 };
 617
 618 static struct ctl_table_header *nf_ct_sysctl_header;
 619 #endif
 620
 621 int __init nf_conntrack_proto_sctp_init(void)
 622 {
 623         int ret;
 624
 625         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp4);
 626         if (ret) {
 627                 printk("nf_conntrack_proto_sctp4: protocol register failed\n");
 628                 goto out;
 629         }
 630         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp6);
 631         if (ret) {
 632                 printk("nf_conntrack_proto_sctp6: protocol register failed\n");
 633                 goto cleanup_sctp4;
 634         }
 635
 636 #ifdef CONFIG_SYSCTL
 637         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 638         if (nf_ct_sysctl_header == NULL) {
 639                 printk("nf_conntrack_proto_sctp: can't register to sysctl.\n");
 640                 goto cleanup;
 641         }
 642 #endif
 643
 644         return ret;
 645
 646 #ifdef CONFIG_SYSCTL
 647  cleanup:
 648         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 649 #endif
 650  cleanup_sctp4:
 651         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 652  out:
 653         DEBUGP("SCTP conntrack module loading %s\n",
 654                                         ret ? "failed": "succeeded");
 655         return ret;
 656 }
 657
 658 void __exit nf_conntrack_proto_sctp_fini(void)
 659 {
 660         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 661         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 662 #ifdef CONFIG_SYSCTL
 663         unregister_sysctl_table(nf_ct_sysctl_header);
 664 #endif
 665         DEBUGP("SCTP conntrack module unloaded\n");
 666 }
 667
 668 module_init(nf_conntrack_proto_sctp_init);
 669 module_exit(nf_conntrack_proto_sctp_fini);
 670
 671 MODULE_LICENSE("GPL");
 672 MODULE_AUTHOR("Kiran Kumar Immidi");
 673 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");