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
  12 #include <linux/types.h>
  13 #include <linux/timer.h>
  14 #include <linux/netfilter.h>
  15 #include <linux/module.h>
  16 #include <linux/in.h>
  17 #include <linux/ip.h>
  18 #include <linux/sctp.h>
  19 #include <linux/string.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <net/netfilter/nf_conntrack.h>
  25 #include <net/netfilter/nf_conntrack_l4proto.h>
  26 #include <net/netfilter/nf_conntrack_ecache.h>
  27
  28 /* Protects conntrack->proto.sctp */
  29 static DEFINE_RWLOCK(sctp_lock);
  30
  31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  32    closely.  They're more complex. --RR
  33
  34    And so for me for SCTP :D -Kiran */
  35
  36 static const char *sctp_conntrack_names[] = {
  37         "NONE",
  38         "CLOSED",
  39         "COOKIE_WAIT",
  40         "COOKIE_ECHOED",
  41         "ESTABLISHED",
  42         "SHUTDOWN_SENT",
  43         "SHUTDOWN_RECD",
  44         "SHUTDOWN_ACK_SENT",
  45 };
  46
  47 #define SECS  * HZ
  48 #define MINS  * 60 SECS
  49 #define HOURS * 60 MINS
  50 #define DAYS  * 24 HOURS
  51
  52 static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
  53 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
  54 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
  55 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
  56 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
  57 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
  58 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  59
  60 static unsigned int * sctp_timeouts[]
  61 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  62     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  63     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  64     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  65     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  66     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  67     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  68     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  69  };
  70
  71 #define sNO SCTP_CONNTRACK_NONE
  72 #define sCL SCTP_CONNTRACK_CLOSED
  73 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  74 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  75 #define sES SCTP_CONNTRACK_ESTABLISHED
  76 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  77 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  78 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  79 #define sIV SCTP_CONNTRACK_MAX
  80
  81 /*
  82         These are the descriptions of the states:
  83
  84 NOTE: These state names are tantalizingly similar to the states of an
  85 SCTP endpoint. But the interpretation of the states is a little different,
  86 considering that these are the states of the connection and not of an end
  87 point. Please note the subtleties. -Kiran
  88
  89 NONE              - Nothing so far.
  90 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  91                     an INIT_ACK chunk in the reply direction.
  92 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
  93 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
  94 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
  95 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
  96 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
  97                     to that of the SHUTDOWN chunk.
  98 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
  99                     the SHUTDOWN chunk. Connection is closed.
 100 */
 101
 102 /* TODO
 103  - I have assumed that the first INIT is in the original direction.
 104  This messes things when an INIT comes in the reply direction in CLOSED
 105  state.
 106  - Check the error type in the reply dir before transitioning from
 107 cookie echoed to closed.
 108  - Sec 5.2.4 of RFC 2960
 109  - Multi Homing support.
 110 */
 111
 112 /* SCTP conntrack state transitions */
 113 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 114         {
 115 /*      ORIGINAL        */
 116 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 117 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 118 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 119 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 120 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 121 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 122 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 123 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 124 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 125 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 126         },
 127         {
 128 /*      REPLY   */
 129 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 130 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 131 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 132 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 133 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 134 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 135 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 136 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 137 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 138 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 139         }
 140 };
 141
 142 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 143                              unsigned int dataoff,
 144                              struct nf_conntrack_tuple *tuple)
 145 {
 146         sctp_sctphdr_t _hdr, *hp;
 147
 148         /* Actually only need first 8 bytes. */
 149         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 150         if (hp == NULL)
 151                 return 0;
 152
 153         tuple->src.u.sctp.port = hp->source;
 154         tuple->dst.u.sctp.port = hp->dest;
 155         return 1;
 156 }
 157
 158 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 159                              const struct nf_conntrack_tuple *orig)
 160 {
 161         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 162         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 163         return 1;
 164 }
 165
 166 /* Print out the per-protocol part of the tuple. */
 167 static int sctp_print_tuple(struct seq_file *s,
 168                             const struct nf_conntrack_tuple *tuple)
 169 {
 170         return seq_printf(s, "sport=%hu dport=%hu ",
 171                           ntohs(tuple->src.u.sctp.port),
 172                           ntohs(tuple->dst.u.sctp.port));
 173 }
 174
 175 /* Print out the private part of the conntrack. */
 176 static int sctp_print_conntrack(struct seq_file *s,
 177                                 const struct nf_conn *conntrack)
 178 {
 179         enum sctp_conntrack state;
 180
 181         read_lock_bh(&sctp_lock);
 182         state = conntrack->proto.sctp.state;
 183         read_unlock_bh(&sctp_lock);
 184
 185         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 186 }
 187
 188 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 189 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
 190         offset < skb->len &&                                            \
 191         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 192         offset += (ntohs(sch->length) + 3) & ~3, count++)
 193
 194 /* Some validity checks to make sure the chunks are fine */
 195 static int do_basic_checks(struct nf_conn *conntrack,
 196                            const struct sk_buff *skb,
 197                            unsigned int dataoff,
 198                            char *map)
 199 {
 200         u_int32_t offset, count;
 201         sctp_chunkhdr_t _sch, *sch;
 202         int flag;
 203
 204         flag = 0;
 205
 206         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 207                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
 208
 209                 if (sch->type == SCTP_CID_INIT
 210                         || sch->type == SCTP_CID_INIT_ACK
 211                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 212                         flag = 1;
 213                 }
 214
 215                 /*
 216                  * Cookie Ack/Echo chunks not the first OR
 217                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 218                  * OR zero-length.
 219                  */
 220                 if (((sch->type == SCTP_CID_COOKIE_ACK
 221                         || sch->type == SCTP_CID_COOKIE_ECHO
 222                         || flag)
 223                       && count !=0) || !sch->length) {
 224                         pr_debug("Basic checks failed\n");
 225                         return 1;
 226                 }
 227
 228                 if (map) {
 229                         set_bit(sch->type, (void *)map);
 230                 }
 231         }
 232
 233         pr_debug("Basic checks passed\n");
 234         return count == 0;
 235 }
 236
 237 static int new_state(enum ip_conntrack_dir dir,
 238                      enum sctp_conntrack cur_state,
 239                      int chunk_type)
 240 {
 241         int i;
 242
 243         pr_debug("Chunk type: %d\n", chunk_type);
 244
 245         switch (chunk_type) {
 246                 case SCTP_CID_INIT:
 247                         pr_debug("SCTP_CID_INIT\n");
 248                         i = 0; break;
 249                 case SCTP_CID_INIT_ACK:
 250                         pr_debug("SCTP_CID_INIT_ACK\n");
 251                         i = 1; break;
 252                 case SCTP_CID_ABORT:
 253                         pr_debug("SCTP_CID_ABORT\n");
 254                         i = 2; break;
 255                 case SCTP_CID_SHUTDOWN:
 256                         pr_debug("SCTP_CID_SHUTDOWN\n");
 257                         i = 3; break;
 258                 case SCTP_CID_SHUTDOWN_ACK:
 259                         pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 260                         i = 4; break;
 261                 case SCTP_CID_ERROR:
 262                         pr_debug("SCTP_CID_ERROR\n");
 263                         i = 5; break;
 264                 case SCTP_CID_COOKIE_ECHO:
 265                         pr_debug("SCTP_CID_COOKIE_ECHO\n");
 266                         i = 6; break;
 267                 case SCTP_CID_COOKIE_ACK:
 268                         pr_debug("SCTP_CID_COOKIE_ACK\n");
 269                         i = 7; break;
 270                 case SCTP_CID_SHUTDOWN_COMPLETE:
 271                         pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 272                         i = 8; break;
 273                 default:
 274                         /* Other chunks like DATA, SACK, HEARTBEAT and
 275                         its ACK do not cause a change in state */
 276                         pr_debug("Unknown chunk type, Will stay in %s\n",
 277                                  sctp_conntrack_names[cur_state]);
 278                         return cur_state;
 279         }
 280
 281         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 282                  dir, sctp_conntrack_names[cur_state], chunk_type,
 283                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 284
 285         return sctp_conntracks[dir][i][cur_state];
 286 }
 287
 288 /* Returns verdict for packet, or -1 for invalid. */
 289 static int sctp_packet(struct nf_conn *conntrack,
 290                        const struct sk_buff *skb,
 291                        unsigned int dataoff,
 292                        enum ip_conntrack_info ctinfo,
 293                        int pf,
 294                        unsigned int hooknum)
 295 {
 296         enum sctp_conntrack newconntrack, oldsctpstate;
 297         sctp_sctphdr_t _sctph, *sh;
 298         sctp_chunkhdr_t _sch, *sch;
 299         u_int32_t offset, count;
 300         char map[256 / sizeof (char)] = {0};
 301
 302         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 303         if (sh == NULL)
 304                 return -1;
 305
 306         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 307                 return -1;
 308
 309         /* Check the verification tag (Sec 8.5) */
 310         if (!test_bit(SCTP_CID_INIT, (void *)map)
 311                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 312                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 313                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 314                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 315                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 316                 pr_debug("Verification tag check failed\n");
 317                 return -1;
 318         }
 319
 320         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 321         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 322                 write_lock_bh(&sctp_lock);
 323
 324                 /* Special cases of Verification tag check (Sec 8.5.1) */
 325                 if (sch->type == SCTP_CID_INIT) {
 326                         /* Sec 8.5.1 (A) */
 327                         if (sh->vtag != 0) {
 328                                 write_unlock_bh(&sctp_lock);
 329                                 return -1;
 330                         }
 331                 } else if (sch->type == SCTP_CID_ABORT) {
 332                         /* Sec 8.5.1 (B) */
 333                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 334                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 335                                                         [1 - CTINFO2DIR(ctinfo)])) {
 336                                 write_unlock_bh(&sctp_lock);
 337                                 return -1;
 338                         }
 339                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 340                         /* Sec 8.5.1 (C) */
 341                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 342                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 343                                                         [1 - CTINFO2DIR(ctinfo)]
 344                                         && (sch->flags & 1))) {
 345                                 write_unlock_bh(&sctp_lock);
 346                                 return -1;
 347                         }
 348                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 349                         /* Sec 8.5.1 (D) */
 350                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 351                                 write_unlock_bh(&sctp_lock);
 352                                 return -1;
 353                         }
 354                 }
 355
 356                 oldsctpstate = conntrack->proto.sctp.state;
 357                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 358
 359                 /* Invalid */
 360                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 361                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 362                                  "conntrack=%u\n",
 363                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 364                         write_unlock_bh(&sctp_lock);
 365                         return -1;
 366                 }
 367
 368                 /* If it is an INIT or an INIT ACK note down the vtag */
 369                 if (sch->type == SCTP_CID_INIT
 370                         || sch->type == SCTP_CID_INIT_ACK) {
 371                         sctp_inithdr_t _inithdr, *ih;
 372
 373                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 374                                                 sizeof(_inithdr), &_inithdr);
 375                         if (ih == NULL) {
 376                                         write_unlock_bh(&sctp_lock);
 377                                         return -1;
 378                         }
 379                         pr_debug("Setting vtag %x for dir %d\n",
 380                                  ih->init_tag, !CTINFO2DIR(ctinfo));
 381                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 382                 }
 383
 384                 conntrack->proto.sctp.state = newconntrack;
 385                 if (oldsctpstate != newconntrack)
 386                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 387                 write_unlock_bh(&sctp_lock);
 388         }
 389
 390         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 391
 392         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 393                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 394                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 395                 pr_debug("Setting assured bit\n");
 396                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 397                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 398         }
 399
 400         return NF_ACCEPT;
 401 }
 402
 403 /* Called when a new connection for this protocol found. */
 404 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 405                     unsigned int dataoff)
 406 {
 407         enum sctp_conntrack newconntrack;
 408         sctp_sctphdr_t _sctph, *sh;
 409         sctp_chunkhdr_t _sch, *sch;
 410         u_int32_t offset, count;
 411         char map[256 / sizeof (char)] = {0};
 412
 413         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 414         if (sh == NULL)
 415                 return 0;
 416
 417         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 418                 return 0;
 419
 420         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 421         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 422                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 423                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 424                 return 0;
 425         }
 426
 427         newconntrack = SCTP_CONNTRACK_MAX;
 428         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 429                 /* Don't need lock here: this conntrack not in circulation yet */
 430                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 431                                          SCTP_CONNTRACK_NONE, sch->type);
 432
 433                 /* Invalid: delete conntrack */
 434                 if (newconntrack == SCTP_CONNTRACK_NONE ||
 435                     newconntrack == SCTP_CONNTRACK_MAX) {
 436                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 437                         return 0;
 438                 }
 439
 440                 /* Copy the vtag into the state info */
 441                 if (sch->type == SCTP_CID_INIT) {
 442                         if (sh->vtag == 0) {
 443                                 sctp_inithdr_t _inithdr, *ih;
 444
 445                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 446                                                         sizeof(_inithdr), &_inithdr);
 447                                 if (ih == NULL)
 448                                         return 0;
 449
 450                                 pr_debug("Setting vtag %x for new conn\n",
 451                                          ih->init_tag);
 452
 453                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 454                                                                 ih->init_tag;
 455                         } else {
 456                                 /* Sec 8.5.1 (A) */
 457                                 return 0;
 458                         }
 459                 }
 460                 /* If it is a shutdown ack OOTB packet, we expect a return
 461                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 462                 else {
 463                         pr_debug("Setting vtag %x for new conn OOTB\n",
 464                                  sh->vtag);
 465                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 466                 }
 467
 468                 conntrack->proto.sctp.state = newconntrack;
 469         }
 470
 471         return 1;
 472 }
 473
 474 #ifdef CONFIG_SYSCTL
 475 static unsigned int sctp_sysctl_table_users;
 476 static struct ctl_table_header *sctp_sysctl_header;
 477 static struct ctl_table sctp_sysctl_table[] = {
 478         {
 479                 .procname       = "nf_conntrack_sctp_timeout_closed",
 480                 .data           = &nf_ct_sctp_timeout_closed,
 481                 .maxlen         = sizeof(unsigned int),
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dointvec_jiffies,
 484         },
 485         {
 486                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 487                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 488                 .maxlen         = sizeof(unsigned int),
 489                 .mode           = 0644,
 490                 .proc_handler   = &proc_dointvec_jiffies,
 491         },
 492         {
 493                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 494                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 495                 .maxlen         = sizeof(unsigned int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec_jiffies,
 498         },
 499         {
 500                 .procname       = "nf_conntrack_sctp_timeout_established",
 501                 .data           = &nf_ct_sctp_timeout_established,
 502                 .maxlen         = sizeof(unsigned int),
 503                 .mode           = 0644,
 504                 .proc_handler   = &proc_dointvec_jiffies,
 505         },
 506         {
 507                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 508                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 509                 .maxlen         = sizeof(unsigned int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec_jiffies,
 512         },
 513         {
 514                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 515                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 516                 .maxlen         = sizeof(unsigned int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_dointvec_jiffies,
 519         },
 520         {
 521                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 522                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 523                 .maxlen         = sizeof(unsigned int),
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dointvec_jiffies,
 526         },
 527         {
 528                 .ctl_name = 0
 529         }
 530 };
 531
 532 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 533 static struct ctl_table sctp_compat_sysctl_table[] = {
 534         {
 535                 .procname       = "ip_conntrack_sctp_timeout_closed",
 536                 .data           = &nf_ct_sctp_timeout_closed,
 537                 .maxlen         = sizeof(unsigned int),
 538                 .mode           = 0644,
 539                 .proc_handler   = &proc_dointvec_jiffies,
 540         },
 541         {
 542                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 543                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 544                 .maxlen         = sizeof(unsigned int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec_jiffies,
 547         },
 548         {
 549                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 550                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 551                 .maxlen         = sizeof(unsigned int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_jiffies,
 554         },
 555         {
 556                 .procname       = "ip_conntrack_sctp_timeout_established",
 557                 .data           = &nf_ct_sctp_timeout_established,
 558                 .maxlen         = sizeof(unsigned int),
 559                 .mode           = 0644,
 560                 .proc_handler   = &proc_dointvec_jiffies,
 561         },
 562         {
 563                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 564                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 565                 .maxlen         = sizeof(unsigned int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec_jiffies,
 568         },
 569         {
 570                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 571                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 572                 .maxlen         = sizeof(unsigned int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec_jiffies,
 575         },
 576         {
 577                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 578                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 579                 .maxlen         = sizeof(unsigned int),
 580                 .mode           = 0644,
 581                 .proc_handler   = &proc_dointvec_jiffies,
 582         },
 583         {
 584                 .ctl_name = 0
 585         }
 586 };
 587 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 588 #endif
 589
 590 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 591         .l3proto                = PF_INET,
 592         .l4proto                = IPPROTO_SCTP,
 593         .name                   = "sctp",
 594         .pkt_to_tuple           = sctp_pkt_to_tuple,
 595         .invert_tuple           = sctp_invert_tuple,
 596         .print_tuple            = sctp_print_tuple,
 597         .print_conntrack        = sctp_print_conntrack,
 598         .packet                 = sctp_packet,
 599         .new                    = sctp_new,
 600         .me                     = THIS_MODULE,
 601 #ifdef CONFIG_SYSCTL
 602         .ctl_table_users        = &sctp_sysctl_table_users,
 603         .ctl_table_header       = &sctp_sysctl_header,
 604         .ctl_table              = sctp_sysctl_table,
 605 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 606         .ctl_compat_table       = sctp_compat_sysctl_table,
 607 #endif
 608 #endif
 609 };
 610
 611 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 612         .l3proto                = PF_INET6,
 613         .l4proto                = IPPROTO_SCTP,
 614         .name                   = "sctp",
 615         .pkt_to_tuple           = sctp_pkt_to_tuple,
 616         .invert_tuple           = sctp_invert_tuple,
 617         .print_tuple            = sctp_print_tuple,
 618         .print_conntrack        = sctp_print_conntrack,
 619         .packet                 = sctp_packet,
 620         .new                    = sctp_new,
 621         .me                     = THIS_MODULE,
 622 #ifdef CONFIG_SYSCTL
 623         .ctl_table_users        = &sctp_sysctl_table_users,
 624         .ctl_table_header       = &sctp_sysctl_header,
 625         .ctl_table              = sctp_sysctl_table,
 626 #endif
 627 };
 628
 629 int __init nf_conntrack_proto_sctp_init(void)
 630 {
 631         int ret;
 632
 633         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 634         if (ret) {
 635                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 636                 goto out;
 637         }
 638         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 639         if (ret) {
 640                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 641                 goto cleanup_sctp4;
 642         }
 643
 644         return ret;
 645
 646  cleanup_sctp4:
 647         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 648  out:
 649         return ret;
 650 }
 651
 652 void __exit nf_conntrack_proto_sctp_fini(void)
 653 {
 654         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 655         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 656 }
 657
 658 module_init(nf_conntrack_proto_sctp_init);
 659 module_exit(nf_conntrack_proto_sctp_fini);
 660
 661 MODULE_LICENSE("GPL");
 662 MODULE_AUTHOR("Kiran Kumar Immidi");
 663 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 664 MODULE_ALIAS("ip_conntrack_proto_sctp");