git.oblomov.eu Git - linux-2.6/blob - 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 const u8 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, const struct nf_conn *ct)
 177 {
 178         enum sctp_conntrack state;
 179
 180         read_lock_bh(&sctp_lock);
 181         state = ct->proto.sctp.state;
 182         read_unlock_bh(&sctp_lock);
 183
 184         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 185 }
 186
 187 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 188 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
 189         (offset) < (skb)->len &&                                        \
 190         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
 191         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
 192
 193 /* Some validity checks to make sure the chunks are fine */
 194 static int do_basic_checks(struct nf_conn *ct,
 195                            const struct sk_buff *skb,
 196                            unsigned int dataoff,
 197                            unsigned long *map)
 198 {
 199         u_int32_t offset, count;
 200         sctp_chunkhdr_t _sch, *sch;
 201         int flag;
 202
 203         flag = 0;
 204
 205         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 206                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
 207
 208                 if (sch->type == SCTP_CID_INIT ||
 209                     sch->type == SCTP_CID_INIT_ACK ||
 210                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
 211                         flag = 1;
 212
 213                 /*
 214                  * Cookie Ack/Echo chunks not the first OR
 215                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 216                  * OR zero-length.
 217                  */
 218                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
 219                       sch->type == SCTP_CID_COOKIE_ECHO ||
 220                       flag) &&
 221                      count != 0) || !sch->length) {
 222                         pr_debug("Basic checks failed\n");
 223                         return 1;
 224                 }
 225
 226                 if (map)
 227                         set_bit(sch->type, map);
 228         }
 229
 230         pr_debug("Basic checks passed\n");
 231         return count == 0;
 232 }
 233
 234 static int new_state(enum ip_conntrack_dir dir,
 235                      enum sctp_conntrack cur_state,
 236                      int chunk_type)
 237 {
 238         int i;
 239
 240         pr_debug("Chunk type: %d\n", chunk_type);
 241
 242         switch (chunk_type) {
 243         case SCTP_CID_INIT:
 244                 pr_debug("SCTP_CID_INIT\n");
 245                 i = 0;
 246                 break;
 247         case SCTP_CID_INIT_ACK:
 248                 pr_debug("SCTP_CID_INIT_ACK\n");
 249                 i = 1;
 250                 break;
 251         case SCTP_CID_ABORT:
 252                 pr_debug("SCTP_CID_ABORT\n");
 253                 i = 2;
 254                 break;
 255         case SCTP_CID_SHUTDOWN:
 256                 pr_debug("SCTP_CID_SHUTDOWN\n");
 257                 i = 3;
 258                 break;
 259         case SCTP_CID_SHUTDOWN_ACK:
 260                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 261                 i = 4;
 262                 break;
 263         case SCTP_CID_ERROR:
 264                 pr_debug("SCTP_CID_ERROR\n");
 265                 i = 5;
 266                 break;
 267         case SCTP_CID_COOKIE_ECHO:
 268                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
 269                 i = 6;
 270                 break;
 271         case SCTP_CID_COOKIE_ACK:
 272                 pr_debug("SCTP_CID_COOKIE_ACK\n");
 273                 i = 7;
 274                 break;
 275         case SCTP_CID_SHUTDOWN_COMPLETE:
 276                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 277                 i = 8;
 278                 break;
 279         default:
 280                 /* Other chunks like DATA, SACK, HEARTBEAT and
 281                 its ACK do not cause a change in state */
 282                 pr_debug("Unknown chunk type, Will stay in %s\n",
 283                          sctp_conntrack_names[cur_state]);
 284                 return cur_state;
 285         }
 286
 287         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 288                  dir, sctp_conntrack_names[cur_state], chunk_type,
 289                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 290
 291         return sctp_conntracks[dir][i][cur_state];
 292 }
 293
 294 /* Returns verdict for packet, or -1 for invalid. */
 295 static int sctp_packet(struct nf_conn *ct,
 296                        const struct sk_buff *skb,
 297                        unsigned int dataoff,
 298                        enum ip_conntrack_info ctinfo,
 299                        int pf,
 300                        unsigned int hooknum)
 301 {
 302         enum sctp_conntrack newconntrack, oldsctpstate;
 303         sctp_sctphdr_t _sctph, *sh;
 304         sctp_chunkhdr_t _sch, *sch;
 305         u_int32_t offset, count;
 306         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 307
 308         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 309         if (sh == NULL)
 310                 return -1;
 311
 312         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 313                 return -1;
 314
 315         /* Check the verification tag (Sec 8.5) */
 316         if (!test_bit(SCTP_CID_INIT, map) &&
 317             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
 318             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
 319             !test_bit(SCTP_CID_ABORT, map) &&
 320             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
 321             sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
 322                 pr_debug("Verification tag check failed\n");
 323                 return -1;
 324         }
 325
 326         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 327         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 328                 write_lock_bh(&sctp_lock);
 329
 330                 /* Special cases of Verification tag check (Sec 8.5.1) */
 331                 if (sch->type == SCTP_CID_INIT) {
 332                         /* Sec 8.5.1 (A) */
 333                         if (sh->vtag != 0) {
 334                                 write_unlock_bh(&sctp_lock);
 335                                 return -1;
 336                         }
 337                 } else if (sch->type == SCTP_CID_ABORT) {
 338                         /* Sec 8.5.1 (B) */
 339                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
 340                             sh->vtag != ct->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)]) {
 341                                 write_unlock_bh(&sctp_lock);
 342                                 return -1;
 343                         }
 344                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 345                         /* Sec 8.5.1 (C) */
 346                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
 347                             sh->vtag != ct->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)] &&
 348                             (sch->flags & 1)) {
 349                                 write_unlock_bh(&sctp_lock);
 350                                 return -1;
 351                         }
 352                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 353                         /* Sec 8.5.1 (D) */
 354                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
 355                                 write_unlock_bh(&sctp_lock);
 356                                 return -1;
 357                         }
 358                 }
 359
 360                 oldsctpstate = ct->proto.sctp.state;
 361                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 362
 363                 /* Invalid */
 364                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 365                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 366                                  "conntrack=%u\n",
 367                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 368                         write_unlock_bh(&sctp_lock);
 369                         return -1;
 370                 }
 371
 372                 /* If it is an INIT or an INIT ACK note down the vtag */
 373                 if (sch->type == SCTP_CID_INIT ||
 374                     sch->type == SCTP_CID_INIT_ACK) {
 375                         sctp_inithdr_t _inithdr, *ih;
 376
 377                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 378                                                 sizeof(_inithdr), &_inithdr);
 379                         if (ih == NULL) {
 380                                 write_unlock_bh(&sctp_lock);
 381                                 return -1;
 382                         }
 383                         pr_debug("Setting vtag %x for dir %d\n",
 384                                  ih->init_tag, !CTINFO2DIR(ctinfo));
 385                         ct->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 386                 }
 387
 388                 ct->proto.sctp.state = newconntrack;
 389                 if (oldsctpstate != newconntrack)
 390                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 391                 write_unlock_bh(&sctp_lock);
 392         }
 393
 394         nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[newconntrack]);
 395
 396         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
 397             CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY &&
 398             newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 399                 pr_debug("Setting assured bit\n");
 400                 set_bit(IPS_ASSURED_BIT, &ct->status);
 401                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 402         }
 403
 404         return NF_ACCEPT;
 405 }
 406
 407 /* Called when a new connection for this protocol found. */
 408 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
 409                     unsigned int dataoff)
 410 {
 411         enum sctp_conntrack newconntrack;
 412         sctp_sctphdr_t _sctph, *sh;
 413         sctp_chunkhdr_t _sch, *sch;
 414         u_int32_t offset, count;
 415         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 416
 417         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 418         if (sh == NULL)
 419                 return 0;
 420
 421         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 422                 return 0;
 423
 424         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 425         if (test_bit(SCTP_CID_ABORT, map) ||
 426             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 427             test_bit(SCTP_CID_COOKIE_ACK, map))
 428                 return 0;
 429
 430         newconntrack = SCTP_CONNTRACK_MAX;
 431         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 432                 /* Don't need lock here: this conntrack not in circulation yet */
 433                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 434                                          SCTP_CONNTRACK_NONE, sch->type);
 435
 436                 /* Invalid: delete conntrack */
 437                 if (newconntrack == SCTP_CONNTRACK_NONE ||
 438                     newconntrack == SCTP_CONNTRACK_MAX) {
 439                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 440                         return 0;
 441                 }
 442
 443                 /* Copy the vtag into the state info */
 444                 if (sch->type == SCTP_CID_INIT) {
 445                         if (sh->vtag == 0) {
 446                                 sctp_inithdr_t _inithdr, *ih;
 447
 448                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 449                                                         sizeof(_inithdr), &_inithdr);
 450                                 if (ih == NULL)
 451                                         return 0;
 452
 453                                 pr_debug("Setting vtag %x for new conn\n",
 454                                          ih->init_tag);
 455
 456                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 457                                                                 ih->init_tag;
 458                         } else {
 459                                 /* Sec 8.5.1 (A) */
 460                                 return 0;
 461                         }
 462                 }
 463                 /* If it is a shutdown ack OOTB packet, we expect a return
 464                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 465                 else {
 466                         pr_debug("Setting vtag %x for new conn OOTB\n",
 467                                  sh->vtag);
 468                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 469                 }
 470
 471                 ct->proto.sctp.state = newconntrack;
 472         }
 473
 474         return 1;
 475 }
 476
 477 #ifdef CONFIG_SYSCTL
 478 static unsigned int sctp_sysctl_table_users;
 479 static struct ctl_table_header *sctp_sysctl_header;
 480 static struct ctl_table sctp_sysctl_table[] = {
 481         {
 482                 .procname       = "nf_conntrack_sctp_timeout_closed",
 483                 .data           = &nf_ct_sctp_timeout_closed,
 484                 .maxlen         = sizeof(unsigned int),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dointvec_jiffies,
 487         },
 488         {
 489                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 490                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 491                 .maxlen         = sizeof(unsigned int),
 492                 .mode           = 0644,
 493                 .proc_handler   = &proc_dointvec_jiffies,
 494         },
 495         {
 496                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 497                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 498                 .maxlen         = sizeof(unsigned int),
 499                 .mode           = 0644,
 500                 .proc_handler   = &proc_dointvec_jiffies,
 501         },
 502         {
 503                 .procname       = "nf_conntrack_sctp_timeout_established",
 504                 .data           = &nf_ct_sctp_timeout_established,
 505                 .maxlen         = sizeof(unsigned int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec_jiffies,
 508         },
 509         {
 510                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 511                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 512                 .maxlen         = sizeof(unsigned int),
 513                 .mode           = 0644,
 514                 .proc_handler   = &proc_dointvec_jiffies,
 515         },
 516         {
 517                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 518                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 519                 .maxlen         = sizeof(unsigned int),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec_jiffies,
 522         },
 523         {
 524                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 525                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 526                 .maxlen         = sizeof(unsigned int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec_jiffies,
 529         },
 530         {
 531                 .ctl_name = 0
 532         }
 533 };
 534
 535 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 536 static struct ctl_table sctp_compat_sysctl_table[] = {
 537         {
 538                 .procname       = "ip_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                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 546                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 547                 .maxlen         = sizeof(unsigned int),
 548                 .mode           = 0644,
 549                 .proc_handler   = &proc_dointvec_jiffies,
 550         },
 551         {
 552                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 553                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 554                 .maxlen         = sizeof(unsigned int),
 555                 .mode           = 0644,
 556                 .proc_handler   = &proc_dointvec_jiffies,
 557         },
 558         {
 559                 .procname       = "ip_conntrack_sctp_timeout_established",
 560                 .data           = &nf_ct_sctp_timeout_established,
 561                 .maxlen         = sizeof(unsigned int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec_jiffies,
 564         },
 565         {
 566                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 567                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec_jiffies,
 571         },
 572         {
 573                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 574                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 575                 .maxlen         = sizeof(unsigned int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_jiffies,
 578         },
 579         {
 580                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 581                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 582                 .maxlen         = sizeof(unsigned int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec_jiffies,
 585         },
 586         {
 587                 .ctl_name = 0
 588         }
 589 };
 590 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 591 #endif
 592
 593 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 594         .l3proto                = PF_INET,
 595         .l4proto                = IPPROTO_SCTP,
 596         .name                   = "sctp",
 597         .pkt_to_tuple           = sctp_pkt_to_tuple,
 598         .invert_tuple           = sctp_invert_tuple,
 599         .print_tuple            = sctp_print_tuple,
 600         .print_conntrack        = sctp_print_conntrack,
 601         .packet                 = sctp_packet,
 602         .new                    = sctp_new,
 603         .me                     = THIS_MODULE,
 604 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 605         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 606         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 607         .nla_policy             = nf_ct_port_nla_policy,
 608 #endif
 609 #ifdef CONFIG_SYSCTL
 610         .ctl_table_users        = &sctp_sysctl_table_users,
 611         .ctl_table_header       = &sctp_sysctl_header,
 612         .ctl_table              = sctp_sysctl_table,
 613 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 614         .ctl_compat_table       = sctp_compat_sysctl_table,
 615 #endif
 616 #endif
 617 };
 618
 619 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 620         .l3proto                = PF_INET6,
 621         .l4proto                = IPPROTO_SCTP,
 622         .name                   = "sctp",
 623         .pkt_to_tuple           = sctp_pkt_to_tuple,
 624         .invert_tuple           = sctp_invert_tuple,
 625         .print_tuple            = sctp_print_tuple,
 626         .print_conntrack        = sctp_print_conntrack,
 627         .packet                 = sctp_packet,
 628         .new                    = sctp_new,
 629         .me                     = THIS_MODULE,
 630 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 631         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 632         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 633         .nla_policy             = nf_ct_port_nla_policy,
 634 #endif
 635 #ifdef CONFIG_SYSCTL
 636         .ctl_table_users        = &sctp_sysctl_table_users,
 637         .ctl_table_header       = &sctp_sysctl_header,
 638         .ctl_table              = sctp_sysctl_table,
 639 #endif
 640 };
 641
 642 int __init nf_conntrack_proto_sctp_init(void)
 643 {
 644         int ret;
 645
 646         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 647         if (ret) {
 648                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 649                 goto out;
 650         }
 651         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 652         if (ret) {
 653                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 654                 goto cleanup_sctp4;
 655         }
 656
 657         return ret;
 658
 659  cleanup_sctp4:
 660         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 661  out:
 662         return ret;
 663 }
 664
 665 void __exit nf_conntrack_proto_sctp_fini(void)
 666 {
 667         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 668         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 669 }
 670
 671 module_init(nf_conntrack_proto_sctp_init);
 672 module_exit(nf_conntrack_proto_sctp_fini);
 673
 674 MODULE_LICENSE("GPL");
 675 MODULE_AUTHOR("Kiran Kumar Immidi");
 676 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 677 MODULE_ALIAS("ip_conntrack_proto_sctp");