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,
 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                            unsigned long *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                  * Cookie Ack/Echo chunks not the first OR
 216                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 217                  * OR zero-length.
 218                  */
 219                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
 220                       sch->type == SCTP_CID_COOKIE_ECHO ||
 221                       flag) &&
 222                      count != 0) || !sch->length) {
 223                         pr_debug("Basic checks failed\n");
 224                         return 1;
 225                 }
 226
 227                 if (map)
 228                         set_bit(sch->type, map);
 229         }
 230
 231         pr_debug("Basic checks passed\n");
 232         return count == 0;
 233 }
 234
 235 static int new_state(enum ip_conntrack_dir dir,
 236                      enum sctp_conntrack cur_state,
 237                      int chunk_type)
 238 {
 239         int i;
 240
 241         pr_debug("Chunk type: %d\n", chunk_type);
 242
 243         switch (chunk_type) {
 244         case SCTP_CID_INIT:
 245                 pr_debug("SCTP_CID_INIT\n");
 246                 i = 0;
 247                 break;
 248         case SCTP_CID_INIT_ACK:
 249                 pr_debug("SCTP_CID_INIT_ACK\n");
 250                 i = 1;
 251                 break;
 252         case SCTP_CID_ABORT:
 253                 pr_debug("SCTP_CID_ABORT\n");
 254                 i = 2;
 255                 break;
 256         case SCTP_CID_SHUTDOWN:
 257                 pr_debug("SCTP_CID_SHUTDOWN\n");
 258                 i = 3;
 259                 break;
 260         case SCTP_CID_SHUTDOWN_ACK:
 261                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 262                 i = 4;
 263                 break;
 264         case SCTP_CID_ERROR:
 265                 pr_debug("SCTP_CID_ERROR\n");
 266                 i = 5;
 267                 break;
 268         case SCTP_CID_COOKIE_ECHO:
 269                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
 270                 i = 6;
 271                 break;
 272         case SCTP_CID_COOKIE_ACK:
 273                 pr_debug("SCTP_CID_COOKIE_ACK\n");
 274                 i = 7;
 275                 break;
 276         case SCTP_CID_SHUTDOWN_COMPLETE:
 277                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 278                 i = 8;
 279                 break;
 280         default:
 281                 /* Other chunks like DATA, SACK, HEARTBEAT and
 282                 its ACK do not cause a change in state */
 283                 pr_debug("Unknown chunk type, Will stay in %s\n",
 284                          sctp_conntrack_names[cur_state]);
 285                 return cur_state;
 286         }
 287
 288         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 289                  dir, sctp_conntrack_names[cur_state], chunk_type,
 290                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 291
 292         return sctp_conntracks[dir][i][cur_state];
 293 }
 294
 295 /* Returns verdict for packet, or -1 for invalid. */
 296 static int sctp_packet(struct nf_conn *conntrack,
 297                        const struct sk_buff *skb,
 298                        unsigned int dataoff,
 299                        enum ip_conntrack_info ctinfo,
 300                        int pf,
 301                        unsigned int hooknum)
 302 {
 303         enum sctp_conntrack newconntrack, oldsctpstate;
 304         sctp_sctphdr_t _sctph, *sh;
 305         sctp_chunkhdr_t _sch, *sch;
 306         u_int32_t offset, count;
 307         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 308
 309         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 310         if (sh == NULL)
 311                 return -1;
 312
 313         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 314                 return -1;
 315
 316         /* Check the verification tag (Sec 8.5) */
 317         if (!test_bit(SCTP_CID_INIT, map) &&
 318             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
 319             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
 320             !test_bit(SCTP_CID_ABORT, map) &&
 321             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
 322             sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
 323                 pr_debug("Verification tag check failed\n");
 324                 return -1;
 325         }
 326
 327         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 328         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 329                 write_lock_bh(&sctp_lock);
 330
 331                 /* Special cases of Verification tag check (Sec 8.5.1) */
 332                 if (sch->type == SCTP_CID_INIT) {
 333                         /* Sec 8.5.1 (A) */
 334                         if (sh->vtag != 0) {
 335                                 write_unlock_bh(&sctp_lock);
 336                                 return -1;
 337                         }
 338                 } else if (sch->type == SCTP_CID_ABORT) {
 339                         /* Sec 8.5.1 (B) */
 340                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
 341                             sh->vtag != conntrack->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)]) {
 342                                 write_unlock_bh(&sctp_lock);
 343                                 return -1;
 344                         }
 345                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 346                         /* Sec 8.5.1 (C) */
 347                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
 348                             sh->vtag != conntrack->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)] &&
 349                             (sch->flags & 1)) {
 350                                 write_unlock_bh(&sctp_lock);
 351                                 return -1;
 352                         }
 353                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 354                         /* Sec 8.5.1 (D) */
 355                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
 356                                 write_unlock_bh(&sctp_lock);
 357                                 return -1;
 358                         }
 359                 }
 360
 361                 oldsctpstate = conntrack->proto.sctp.state;
 362                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 363
 364                 /* Invalid */
 365                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 366                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 367                                  "conntrack=%u\n",
 368                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 369                         write_unlock_bh(&sctp_lock);
 370                         return -1;
 371                 }
 372
 373                 /* If it is an INIT or an INIT ACK note down the vtag */
 374                 if (sch->type == SCTP_CID_INIT ||
 375                     sch->type == SCTP_CID_INIT_ACK) {
 376                         sctp_inithdr_t _inithdr, *ih;
 377
 378                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 379                                                 sizeof(_inithdr), &_inithdr);
 380                         if (ih == NULL) {
 381                                 write_unlock_bh(&sctp_lock);
 382                                 return -1;
 383                         }
 384                         pr_debug("Setting vtag %x for dir %d\n",
 385                                  ih->init_tag, !CTINFO2DIR(ctinfo));
 386                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 387                 }
 388
 389                 conntrack->proto.sctp.state = newconntrack;
 390                 if (oldsctpstate != newconntrack)
 391                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 392                 write_unlock_bh(&sctp_lock);
 393         }
 394
 395         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 396
 397         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
 398             CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY &&
 399             newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 400                 pr_debug("Setting assured bit\n");
 401                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 402                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 403         }
 404
 405         return NF_ACCEPT;
 406 }
 407
 408 /* Called when a new connection for this protocol found. */
 409 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 410                     unsigned int dataoff)
 411 {
 412         enum sctp_conntrack newconntrack;
 413         sctp_sctphdr_t _sctph, *sh;
 414         sctp_chunkhdr_t _sch, *sch;
 415         u_int32_t offset, count;
 416         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 417
 418         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 419         if (sh == NULL)
 420                 return 0;
 421
 422         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 423                 return 0;
 424
 425         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 426         if (test_bit(SCTP_CID_ABORT, map) ||
 427             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 428             test_bit(SCTP_CID_COOKIE_ACK, map))
 429                 return 0;
 430
 431         newconntrack = SCTP_CONNTRACK_MAX;
 432         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 433                 /* Don't need lock here: this conntrack not in circulation yet */
 434                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 435                                          SCTP_CONNTRACK_NONE, sch->type);
 436
 437                 /* Invalid: delete conntrack */
 438                 if (newconntrack == SCTP_CONNTRACK_NONE ||
 439                     newconntrack == SCTP_CONNTRACK_MAX) {
 440                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 441                         return 0;
 442                 }
 443
 444                 /* Copy the vtag into the state info */
 445                 if (sch->type == SCTP_CID_INIT) {
 446                         if (sh->vtag == 0) {
 447                                 sctp_inithdr_t _inithdr, *ih;
 448
 449                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 450                                                         sizeof(_inithdr), &_inithdr);
 451                                 if (ih == NULL)
 452                                         return 0;
 453
 454                                 pr_debug("Setting vtag %x for new conn\n",
 455                                          ih->init_tag);
 456
 457                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 458                                                                 ih->init_tag;
 459                         } else {
 460                                 /* Sec 8.5.1 (A) */
 461                                 return 0;
 462                         }
 463                 }
 464                 /* If it is a shutdown ack OOTB packet, we expect a return
 465                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 466                 else {
 467                         pr_debug("Setting vtag %x for new conn OOTB\n",
 468                                  sh->vtag);
 469                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 470                 }
 471
 472                 conntrack->proto.sctp.state = newconntrack;
 473         }
 474
 475         return 1;
 476 }
 477
 478 #ifdef CONFIG_SYSCTL
 479 static unsigned int sctp_sysctl_table_users;
 480 static struct ctl_table_header *sctp_sysctl_header;
 481 static struct ctl_table sctp_sysctl_table[] = {
 482         {
 483                 .procname       = "nf_conntrack_sctp_timeout_closed",
 484                 .data           = &nf_ct_sctp_timeout_closed,
 485                 .maxlen         = sizeof(unsigned int),
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dointvec_jiffies,
 488         },
 489         {
 490                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 491                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 492                 .maxlen         = sizeof(unsigned int),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dointvec_jiffies,
 495         },
 496         {
 497                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 498                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 499                 .maxlen         = sizeof(unsigned int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &proc_dointvec_jiffies,
 502         },
 503         {
 504                 .procname       = "nf_conntrack_sctp_timeout_established",
 505                 .data           = &nf_ct_sctp_timeout_established,
 506                 .maxlen         = sizeof(unsigned int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec_jiffies,
 509         },
 510         {
 511                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 512                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 513                 .maxlen         = sizeof(unsigned int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec_jiffies,
 516         },
 517         {
 518                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 519                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 520                 .maxlen         = sizeof(unsigned int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec_jiffies,
 523         },
 524         {
 525                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 526                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 527                 .maxlen         = sizeof(unsigned int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec_jiffies,
 530         },
 531         {
 532                 .ctl_name = 0
 533         }
 534 };
 535
 536 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 537 static struct ctl_table sctp_compat_sysctl_table[] = {
 538         {
 539                 .procname       = "ip_conntrack_sctp_timeout_closed",
 540                 .data           = &nf_ct_sctp_timeout_closed,
 541                 .maxlen         = sizeof(unsigned int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec_jiffies,
 544         },
 545         {
 546                 .procname       = "ip_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                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 554                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 555                 .maxlen         = sizeof(unsigned int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec_jiffies,
 558         },
 559         {
 560                 .procname       = "ip_conntrack_sctp_timeout_established",
 561                 .data           = &nf_ct_sctp_timeout_established,
 562                 .maxlen         = sizeof(unsigned int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec_jiffies,
 565         },
 566         {
 567                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 568                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 569                 .maxlen         = sizeof(unsigned int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec_jiffies,
 572         },
 573         {
 574                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 575                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 576                 .maxlen         = sizeof(unsigned int),
 577                 .mode           = 0644,
 578                 .proc_handler   = &proc_dointvec_jiffies,
 579         },
 580         {
 581                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 582                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 583                 .maxlen         = sizeof(unsigned int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_jiffies,
 586         },
 587         {
 588                 .ctl_name = 0
 589         }
 590 };
 591 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 592 #endif
 593
 594 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 595         .l3proto                = PF_INET,
 596         .l4proto                = IPPROTO_SCTP,
 597         .name                   = "sctp",
 598         .pkt_to_tuple           = sctp_pkt_to_tuple,
 599         .invert_tuple           = sctp_invert_tuple,
 600         .print_tuple            = sctp_print_tuple,
 601         .print_conntrack        = sctp_print_conntrack,
 602         .packet                 = sctp_packet,
 603         .new                    = sctp_new,
 604         .me                     = THIS_MODULE,
 605 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 606         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 607         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 608         .nla_policy             = nf_ct_port_nla_policy,
 609 #endif
 610 #ifdef CONFIG_SYSCTL
 611         .ctl_table_users        = &sctp_sysctl_table_users,
 612         .ctl_table_header       = &sctp_sysctl_header,
 613         .ctl_table              = sctp_sysctl_table,
 614 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 615         .ctl_compat_table       = sctp_compat_sysctl_table,
 616 #endif
 617 #endif
 618 };
 619
 620 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 621         .l3proto                = PF_INET6,
 622         .l4proto                = IPPROTO_SCTP,
 623         .name                   = "sctp",
 624         .pkt_to_tuple           = sctp_pkt_to_tuple,
 625         .invert_tuple           = sctp_invert_tuple,
 626         .print_tuple            = sctp_print_tuple,
 627         .print_conntrack        = sctp_print_conntrack,
 628         .packet                 = sctp_packet,
 629         .new                    = sctp_new,
 630         .me                     = THIS_MODULE,
 631 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 632         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 633         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 634         .nla_policy             = nf_ct_port_nla_policy,
 635 #endif
 636 #ifdef CONFIG_SYSCTL
 637         .ctl_table_users        = &sctp_sysctl_table_users,
 638         .ctl_table_header       = &sctp_sysctl_header,
 639         .ctl_table              = sctp_sysctl_table,
 640 #endif
 641 };
 642
 643 int __init nf_conntrack_proto_sctp_init(void)
 644 {
 645         int ret;
 646
 647         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 648         if (ret) {
 649                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 650                 goto out;
 651         }
 652         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 653         if (ret) {
 654                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 655                 goto cleanup_sctp4;
 656         }
 657
 658         return ret;
 659
 660  cleanup_sctp4:
 661         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 662  out:
 663         return ret;
 664 }
 665
 666 void __exit nf_conntrack_proto_sctp_fini(void)
 667 {
 668         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 669         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 670 }
 671
 672 module_init(nf_conntrack_proto_sctp_init);
 673 module_exit(nf_conntrack_proto_sctp_fini);
 674
 675 MODULE_LICENSE("GPL");
 676 MODULE_AUTHOR("Kiran Kumar Immidi");
 677 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 678 MODULE_ALIAS("ip_conntrack_proto_sctp");