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 #if 0
  29 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  30 #else
  31 #define DEBUGP(format, args...)
  32 #endif
  33
  34 /* Protects conntrack->proto.sctp */
  35 static DEFINE_RWLOCK(sctp_lock);
  36
  37 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  38    closely.  They're more complex. --RR
  39
  40    And so for me for SCTP :D -Kiran */
  41
  42 static const char *sctp_conntrack_names[] = {
  43         "NONE",
  44         "CLOSED",
  45         "COOKIE_WAIT",
  46         "COOKIE_ECHOED",
  47         "ESTABLISHED",
  48         "SHUTDOWN_SENT",
  49         "SHUTDOWN_RECD",
  50         "SHUTDOWN_ACK_SENT",
  51 };
  52
  53 #define SECS  * HZ
  54 #define MINS  * 60 SECS
  55 #define HOURS * 60 MINS
  56 #define DAYS  * 24 HOURS
  57
  58 static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
  59 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
  60 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
  61 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
  62 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
  63 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
  64 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  65
  66 static unsigned int * sctp_timeouts[]
  67 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  68     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  69     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  70     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  71     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  72     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  73     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  74     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  75  };
  76
  77 #define sNO SCTP_CONNTRACK_NONE
  78 #define sCL SCTP_CONNTRACK_CLOSED
  79 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  80 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  81 #define sES SCTP_CONNTRACK_ESTABLISHED
  82 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  83 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  84 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  85 #define sIV SCTP_CONNTRACK_MAX
  86
  87 /*
  88         These are the descriptions of the states:
  89
  90 NOTE: These state names are tantalizingly similar to the states of an
  91 SCTP endpoint. But the interpretation of the states is a little different,
  92 considering that these are the states of the connection and not of an end
  93 point. Please note the subtleties. -Kiran
  94
  95 NONE              - Nothing so far.
  96 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  97                     an INIT_ACK chunk in the reply direction.
  98 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
  99 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 100 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 101 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 102 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 103                     to that of the SHUTDOWN chunk.
 104 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 105                     the SHUTDOWN chunk. Connection is closed.
 106 */
 107
 108 /* TODO
 109  - I have assumed that the first INIT is in the original direction.
 110  This messes things when an INIT comes in the reply direction in CLOSED
 111  state.
 112  - Check the error type in the reply dir before transitioning from
 113 cookie echoed to closed.
 114  - Sec 5.2.4 of RFC 2960
 115  - Multi Homing support.
 116 */
 117
 118 /* SCTP conntrack state transitions */
 119 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 120         {
 121 /*      ORIGINAL        */
 122 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 123 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 124 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 125 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 126 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 127 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 128 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 129 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 130 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 131 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 132         },
 133         {
 134 /*      REPLY   */
 135 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 136 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 137 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 138 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 139 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 140 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 141 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 142 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 143 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 144 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 145         }
 146 };
 147
 148 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 149                              unsigned int dataoff,
 150                              struct nf_conntrack_tuple *tuple)
 151 {
 152         sctp_sctphdr_t _hdr, *hp;
 153
 154         DEBUGP(__FUNCTION__);
 155         DEBUGP("\n");
 156
 157         /* Actually only need first 8 bytes. */
 158         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 159         if (hp == NULL)
 160                 return 0;
 161
 162         tuple->src.u.sctp.port = hp->source;
 163         tuple->dst.u.sctp.port = hp->dest;
 164         return 1;
 165 }
 166
 167 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 168                              const struct nf_conntrack_tuple *orig)
 169 {
 170         DEBUGP(__FUNCTION__);
 171         DEBUGP("\n");
 172
 173         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 174         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 175         return 1;
 176 }
 177
 178 /* Print out the per-protocol part of the tuple. */
 179 static int sctp_print_tuple(struct seq_file *s,
 180                             const struct nf_conntrack_tuple *tuple)
 181 {
 182         DEBUGP(__FUNCTION__);
 183         DEBUGP("\n");
 184
 185         return seq_printf(s, "sport=%hu dport=%hu ",
 186                           ntohs(tuple->src.u.sctp.port),
 187                           ntohs(tuple->dst.u.sctp.port));
 188 }
 189
 190 /* Print out the private part of the conntrack. */
 191 static int sctp_print_conntrack(struct seq_file *s,
 192                                 const struct nf_conn *conntrack)
 193 {
 194         enum sctp_conntrack state;
 195
 196         DEBUGP(__FUNCTION__);
 197         DEBUGP("\n");
 198
 199         read_lock_bh(&sctp_lock);
 200         state = conntrack->proto.sctp.state;
 201         read_unlock_bh(&sctp_lock);
 202
 203         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 204 }
 205
 206 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 207 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
 208         offset < skb->len &&                                            \
 209         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 210         offset += (ntohs(sch->length) + 3) & ~3, count++)
 211
 212 /* Some validity checks to make sure the chunks are fine */
 213 static int do_basic_checks(struct nf_conn *conntrack,
 214                            const struct sk_buff *skb,
 215                            unsigned int dataoff,
 216                            char *map)
 217 {
 218         u_int32_t offset, count;
 219         sctp_chunkhdr_t _sch, *sch;
 220         int flag;
 221
 222         DEBUGP(__FUNCTION__);
 223         DEBUGP("\n");
 224
 225         flag = 0;
 226
 227         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 228                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 229
 230                 if (sch->type == SCTP_CID_INIT
 231                         || sch->type == SCTP_CID_INIT_ACK
 232                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 233                         flag = 1;
 234                 }
 235
 236                 /*
 237                  * Cookie Ack/Echo chunks not the first OR
 238                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 239                  * OR zero-length.
 240                  */
 241                 if (((sch->type == SCTP_CID_COOKIE_ACK
 242                         || sch->type == SCTP_CID_COOKIE_ECHO
 243                         || flag)
 244                       && count !=0) || !sch->length) {
 245                         DEBUGP("Basic checks failed\n");
 246                         return 1;
 247                 }
 248
 249                 if (map) {
 250                         set_bit(sch->type, (void *)map);
 251                 }
 252         }
 253
 254         DEBUGP("Basic checks passed\n");
 255         return count == 0;
 256 }
 257
 258 static int new_state(enum ip_conntrack_dir dir,
 259                      enum sctp_conntrack cur_state,
 260                      int chunk_type)
 261 {
 262         int i;
 263
 264         DEBUGP(__FUNCTION__);
 265         DEBUGP("\n");
 266
 267         DEBUGP("Chunk type: %d\n", chunk_type);
 268
 269         switch (chunk_type) {
 270                 case SCTP_CID_INIT:
 271                         DEBUGP("SCTP_CID_INIT\n");
 272                         i = 0; break;
 273                 case SCTP_CID_INIT_ACK:
 274                         DEBUGP("SCTP_CID_INIT_ACK\n");
 275                         i = 1; break;
 276                 case SCTP_CID_ABORT:
 277                         DEBUGP("SCTP_CID_ABORT\n");
 278                         i = 2; break;
 279                 case SCTP_CID_SHUTDOWN:
 280                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 281                         i = 3; break;
 282                 case SCTP_CID_SHUTDOWN_ACK:
 283                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 284                         i = 4; break;
 285                 case SCTP_CID_ERROR:
 286                         DEBUGP("SCTP_CID_ERROR\n");
 287                         i = 5; break;
 288                 case SCTP_CID_COOKIE_ECHO:
 289                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 290                         i = 6; break;
 291                 case SCTP_CID_COOKIE_ACK:
 292                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 293                         i = 7; break;
 294                 case SCTP_CID_SHUTDOWN_COMPLETE:
 295                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 296                         i = 8; break;
 297                 default:
 298                         /* Other chunks like DATA, SACK, HEARTBEAT and
 299                         its ACK do not cause a change in state */
 300                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 301                                                 sctp_conntrack_names[cur_state]);
 302                         return cur_state;
 303         }
 304
 305         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 306                         dir, sctp_conntrack_names[cur_state], chunk_type,
 307                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 308
 309         return sctp_conntracks[dir][i][cur_state];
 310 }
 311
 312 /* Returns verdict for packet, or -1 for invalid. */
 313 static int sctp_packet(struct nf_conn *conntrack,
 314                        const struct sk_buff *skb,
 315                        unsigned int dataoff,
 316                        enum ip_conntrack_info ctinfo,
 317                        int pf,
 318                        unsigned int hooknum)
 319 {
 320         enum sctp_conntrack newconntrack, oldsctpstate;
 321         sctp_sctphdr_t _sctph, *sh;
 322         sctp_chunkhdr_t _sch, *sch;
 323         u_int32_t offset, count;
 324         char map[256 / sizeof (char)] = {0};
 325
 326         DEBUGP(__FUNCTION__);
 327         DEBUGP("\n");
 328
 329         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 330         if (sh == NULL)
 331                 return -1;
 332
 333         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 334                 return -1;
 335
 336         /* Check the verification tag (Sec 8.5) */
 337         if (!test_bit(SCTP_CID_INIT, (void *)map)
 338                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 339                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 340                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 341                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 342                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 343                 DEBUGP("Verification tag check failed\n");
 344                 return -1;
 345         }
 346
 347         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 348         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 349                 write_lock_bh(&sctp_lock);
 350
 351                 /* Special cases of Verification tag check (Sec 8.5.1) */
 352                 if (sch->type == SCTP_CID_INIT) {
 353                         /* Sec 8.5.1 (A) */
 354                         if (sh->vtag != 0) {
 355                                 write_unlock_bh(&sctp_lock);
 356                                 return -1;
 357                         }
 358                 } else if (sch->type == SCTP_CID_ABORT) {
 359                         /* Sec 8.5.1 (B) */
 360                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 361                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 362                                                         [1 - CTINFO2DIR(ctinfo)])) {
 363                                 write_unlock_bh(&sctp_lock);
 364                                 return -1;
 365                         }
 366                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 367                         /* Sec 8.5.1 (C) */
 368                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 369                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 370                                                         [1 - CTINFO2DIR(ctinfo)]
 371                                         && (sch->flags & 1))) {
 372                                 write_unlock_bh(&sctp_lock);
 373                                 return -1;
 374                         }
 375                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 376                         /* Sec 8.5.1 (D) */
 377                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 378                                 write_unlock_bh(&sctp_lock);
 379                                 return -1;
 380                         }
 381                 }
 382
 383                 oldsctpstate = conntrack->proto.sctp.state;
 384                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 385
 386                 /* Invalid */
 387                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 388                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 389                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 390                         write_unlock_bh(&sctp_lock);
 391                         return -1;
 392                 }
 393
 394                 /* If it is an INIT or an INIT ACK note down the vtag */
 395                 if (sch->type == SCTP_CID_INIT
 396                         || sch->type == SCTP_CID_INIT_ACK) {
 397                         sctp_inithdr_t _inithdr, *ih;
 398
 399                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 400                                                 sizeof(_inithdr), &_inithdr);
 401                         if (ih == NULL) {
 402                                         write_unlock_bh(&sctp_lock);
 403                                         return -1;
 404                         }
 405                         DEBUGP("Setting vtag %x for dir %d\n",
 406                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 407                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 408                 }
 409
 410                 conntrack->proto.sctp.state = newconntrack;
 411                 if (oldsctpstate != newconntrack)
 412                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 413                 write_unlock_bh(&sctp_lock);
 414         }
 415
 416         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 417
 418         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 419                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 420                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 421                 DEBUGP("Setting assured bit\n");
 422                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 423                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 424         }
 425
 426         return NF_ACCEPT;
 427 }
 428
 429 /* Called when a new connection for this protocol found. */
 430 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 431                     unsigned int dataoff)
 432 {
 433         enum sctp_conntrack newconntrack;
 434         sctp_sctphdr_t _sctph, *sh;
 435         sctp_chunkhdr_t _sch, *sch;
 436         u_int32_t offset, count;
 437         char map[256 / sizeof (char)] = {0};
 438
 439         DEBUGP(__FUNCTION__);
 440         DEBUGP("\n");
 441
 442         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 443         if (sh == NULL)
 444                 return 0;
 445
 446         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 447                 return 0;
 448
 449         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 450         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 451                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 452                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 453                 return 0;
 454         }
 455
 456         newconntrack = SCTP_CONNTRACK_MAX;
 457         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 458                 /* Don't need lock here: this conntrack not in circulation yet */
 459                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 460                                          SCTP_CONNTRACK_NONE, sch->type);
 461
 462                 /* Invalid: delete conntrack */
 463                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 464                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
 465                         return 0;
 466                 }
 467
 468                 /* Copy the vtag into the state info */
 469                 if (sch->type == SCTP_CID_INIT) {
 470                         if (sh->vtag == 0) {
 471                                 sctp_inithdr_t _inithdr, *ih;
 472
 473                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 474                                                         sizeof(_inithdr), &_inithdr);
 475                                 if (ih == NULL)
 476                                         return 0;
 477
 478                                 DEBUGP("Setting vtag %x for new conn\n",
 479                                         ih->init_tag);
 480
 481                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 482                                                                 ih->init_tag;
 483                         } else {
 484                                 /* Sec 8.5.1 (A) */
 485                                 return 0;
 486                         }
 487                 }
 488                 /* If it is a shutdown ack OOTB packet, we expect a return
 489                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 490                 else {
 491                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 492                                 sh->vtag);
 493                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 494                 }
 495
 496                 conntrack->proto.sctp.state = newconntrack;
 497         }
 498
 499         return 1;
 500 }
 501
 502 #ifdef CONFIG_SYSCTL
 503 static unsigned int sctp_sysctl_table_users;
 504 static struct ctl_table_header *sctp_sysctl_header;
 505 static struct ctl_table sctp_sysctl_table[] = {
 506         {
 507                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 508                 .procname       = "nf_conntrack_sctp_timeout_closed",
 509                 .data           = &nf_ct_sctp_timeout_closed,
 510                 .maxlen         = sizeof(unsigned int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_dointvec_jiffies,
 513         },
 514         {
 515                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 516                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 517                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 518                 .maxlen         = sizeof(unsigned int),
 519                 .mode           = 0644,
 520                 .proc_handler   = &proc_dointvec_jiffies,
 521         },
 522         {
 523                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 524                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 525                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 526                 .maxlen         = sizeof(unsigned int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec_jiffies,
 529         },
 530         {
 531                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 532                 .procname       = "nf_conntrack_sctp_timeout_established",
 533                 .data           = &nf_ct_sctp_timeout_established,
 534                 .maxlen         = sizeof(unsigned int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec_jiffies,
 537         },
 538         {
 539                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 540                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 541                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 542                 .maxlen         = sizeof(unsigned int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec_jiffies,
 545         },
 546         {
 547                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 548                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 549                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 550                 .maxlen         = sizeof(unsigned int),
 551                 .mode           = 0644,
 552                 .proc_handler   = &proc_dointvec_jiffies,
 553         },
 554         {
 555                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 556                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 557                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 558                 .maxlen         = sizeof(unsigned int),
 559                 .mode           = 0644,
 560                 .proc_handler   = &proc_dointvec_jiffies,
 561         },
 562         {
 563                 .ctl_name = 0
 564         }
 565 };
 566
 567 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 568 static struct ctl_table sctp_compat_sysctl_table[] = {
 569         {
 570                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 571                 .procname       = "ip_conntrack_sctp_timeout_closed",
 572                 .data           = &nf_ct_sctp_timeout_closed,
 573                 .maxlen         = sizeof(unsigned int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec_jiffies,
 576         },
 577         {
 578                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 579                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 580                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 581                 .maxlen         = sizeof(unsigned int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec_jiffies,
 584         },
 585         {
 586                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 587                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 588                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 589                 .maxlen         = sizeof(unsigned int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec_jiffies,
 592         },
 593         {
 594                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 595                 .procname       = "ip_conntrack_sctp_timeout_established",
 596                 .data           = &nf_ct_sctp_timeout_established,
 597                 .maxlen         = sizeof(unsigned int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec_jiffies,
 600         },
 601         {
 602                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 603                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 604                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 605                 .maxlen         = sizeof(unsigned int),
 606                 .mode           = 0644,
 607                 .proc_handler   = &proc_dointvec_jiffies,
 608         },
 609         {
 610                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 611                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 612                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 613                 .maxlen         = sizeof(unsigned int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec_jiffies,
 616         },
 617         {
 618                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 619                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 620                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 621                 .maxlen         = sizeof(unsigned int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec_jiffies,
 624         },
 625         {
 626                 .ctl_name = 0
 627         }
 628 };
 629 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 630 #endif
 631
 632 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
 633         .l3proto                = PF_INET,
 634         .l4proto                = IPPROTO_SCTP,
 635         .name                   = "sctp",
 636         .pkt_to_tuple           = sctp_pkt_to_tuple,
 637         .invert_tuple           = sctp_invert_tuple,
 638         .print_tuple            = sctp_print_tuple,
 639         .print_conntrack        = sctp_print_conntrack,
 640         .packet                 = sctp_packet,
 641         .new                    = sctp_new,
 642         .me                     = THIS_MODULE,
 643 #ifdef CONFIG_SYSCTL
 644         .ctl_table_users        = &sctp_sysctl_table_users,
 645         .ctl_table_header       = &sctp_sysctl_header,
 646         .ctl_table              = sctp_sysctl_table,
 647 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 648         .ctl_compat_table       = sctp_compat_sysctl_table,
 649 #endif
 650 #endif
 651 };
 652
 653 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 = {
 654         .l3proto                = PF_INET6,
 655         .l4proto                = IPPROTO_SCTP,
 656         .name                   = "sctp",
 657         .pkt_to_tuple           = sctp_pkt_to_tuple,
 658         .invert_tuple           = sctp_invert_tuple,
 659         .print_tuple            = sctp_print_tuple,
 660         .print_conntrack        = sctp_print_conntrack,
 661         .packet                 = sctp_packet,
 662         .new                    = sctp_new,
 663         .me                     = THIS_MODULE,
 664 #ifdef CONFIG_SYSCTL
 665         .ctl_table_users        = &sctp_sysctl_table_users,
 666         .ctl_table_header       = &sctp_sysctl_header,
 667         .ctl_table              = sctp_sysctl_table,
 668 #endif
 669 };
 670
 671 int __init nf_conntrack_proto_sctp_init(void)
 672 {
 673         int ret;
 674
 675         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 676         if (ret) {
 677                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 678                 goto out;
 679         }
 680         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 681         if (ret) {
 682                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 683                 goto cleanup_sctp4;
 684         }
 685
 686         return ret;
 687
 688  cleanup_sctp4:
 689         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 690  out:
 691         DEBUGP("SCTP conntrack module loading %s\n",
 692                                         ret ? "failed": "succeeded");
 693         return ret;
 694 }
 695
 696 void __exit nf_conntrack_proto_sctp_fini(void)
 697 {
 698         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 699         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 700         DEBUGP("SCTP conntrack module unloaded\n");
 701 }
 702
 703 module_init(nf_conntrack_proto_sctp_init);
 704 module_exit(nf_conntrack_proto_sctp_fini);
 705
 706 MODULE_LICENSE("GPL");
 707 MODULE_AUTHOR("Kiran Kumar Immidi");
 708 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 709 MODULE_ALIAS("ip_conntrack_proto_sctp");