SAFE public projects git trees. - safe/jmp/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  * 17 Oct 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  12  *      - enable working with L3 protocol independent connection tracking.
  13  *
  14  * Derived from net/ipv4/ip_conntrack_sctp.c
  15  */
  16
  17 /*
  18  * Added support for proc manipulation of timeouts.
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/sched.h>
  23 #include <linux/timer.h>
  24 #include <linux/netfilter.h>
  25 #include <linux/module.h>
  26 #include <linux/in.h>
  27 #include <linux/ip.h>
  28 #include <linux/sctp.h>
  29 #include <linux/string.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/interrupt.h>
  33
  34 #include <net/netfilter/nf_conntrack.h>
  35 #include <net/netfilter/nf_conntrack_l4proto.h>
  36 #include <net/netfilter/nf_conntrack_ecache.h>
  37
  38 #if 0
  39 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  40 #else
  41 #define DEBUGP(format, args...)
  42 #endif
  43
  44 /* Protects conntrack->proto.sctp */
  45 static DEFINE_RWLOCK(sctp_lock);
  46
  47 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  48    closely.  They're more complex. --RR
  49
  50    And so for me for SCTP :D -Kiran */
  51
  52 static const char *sctp_conntrack_names[] = {
  53         "NONE",
  54         "CLOSED",
  55         "COOKIE_WAIT",
  56         "COOKIE_ECHOED",
  57         "ESTABLISHED",
  58         "SHUTDOWN_SENT",
  59         "SHUTDOWN_RECD",
  60         "SHUTDOWN_ACK_SENT",
  61 };
  62
  63 #define SECS  * HZ
  64 #define MINS  * 60 SECS
  65 #define HOURS * 60 MINS
  66 #define DAYS  * 24 HOURS
  67
  68 static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
  69 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
  70 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
  71 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
  72 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
  73 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
  74 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  75
  76 static unsigned int * sctp_timeouts[]
  77 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  78     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  79     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  80     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  81     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  82     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  83     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  84     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  85  };
  86
  87 #define sNO SCTP_CONNTRACK_NONE
  88 #define sCL SCTP_CONNTRACK_CLOSED
  89 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  90 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  91 #define sES SCTP_CONNTRACK_ESTABLISHED
  92 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  93 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  94 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  95 #define sIV SCTP_CONNTRACK_MAX
  96
  97 /*
  98         These are the descriptions of the states:
  99
 100 NOTE: These state names are tantalizingly similar to the states of an
 101 SCTP endpoint. But the interpretation of the states is a little different,
 102 considering that these are the states of the connection and not of an end
 103 point. Please note the subtleties. -Kiran
 104
 105 NONE              - Nothing so far.
 106 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
 107                     an INIT_ACK chunk in the reply direction.
 108 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 109 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 110 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 111 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 112 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 113                     to that of the SHUTDOWN chunk.
 114 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 115                     the SHUTDOWN chunk. Connection is closed.
 116 */
 117
 118 /* TODO
 119  - I have assumed that the first INIT is in the original direction.
 120  This messes things when an INIT comes in the reply direction in CLOSED
 121  state.
 122  - Check the error type in the reply dir before transitioning from
 123 cookie echoed to closed.
 124  - Sec 5.2.4 of RFC 2960
 125  - Multi Homing support.
 126 */
 127
 128 /* SCTP conntrack state transitions */
 129 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 130         {
 131 /*      ORIGINAL        */
 132 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 133 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 134 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 135 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 136 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 137 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 138 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 139 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 140 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 141 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 142         },
 143         {
 144 /*      REPLY   */
 145 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 146 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 147 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 148 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 149 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 150 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 151 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 152 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 153 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 154 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 155         }
 156 };
 157
 158 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 159                              unsigned int dataoff,
 160                              struct nf_conntrack_tuple *tuple)
 161 {
 162         sctp_sctphdr_t _hdr, *hp;
 163
 164         DEBUGP(__FUNCTION__);
 165         DEBUGP("\n");
 166
 167         /* Actually only need first 8 bytes. */
 168         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 169         if (hp == NULL)
 170                 return 0;
 171
 172         tuple->src.u.sctp.port = hp->source;
 173         tuple->dst.u.sctp.port = hp->dest;
 174         return 1;
 175 }
 176
 177 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 178                              const struct nf_conntrack_tuple *orig)
 179 {
 180         DEBUGP(__FUNCTION__);
 181         DEBUGP("\n");
 182
 183         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 184         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 185         return 1;
 186 }
 187
 188 /* Print out the per-protocol part of the tuple. */
 189 static int sctp_print_tuple(struct seq_file *s,
 190                             const struct nf_conntrack_tuple *tuple)
 191 {
 192         DEBUGP(__FUNCTION__);
 193         DEBUGP("\n");
 194
 195         return seq_printf(s, "sport=%hu dport=%hu ",
 196                           ntohs(tuple->src.u.sctp.port),
 197                           ntohs(tuple->dst.u.sctp.port));
 198 }
 199
 200 /* Print out the private part of the conntrack. */
 201 static int sctp_print_conntrack(struct seq_file *s,
 202                                 const struct nf_conn *conntrack)
 203 {
 204         enum sctp_conntrack state;
 205
 206         DEBUGP(__FUNCTION__);
 207         DEBUGP("\n");
 208
 209         read_lock_bh(&sctp_lock);
 210         state = conntrack->proto.sctp.state;
 211         read_unlock_bh(&sctp_lock);
 212
 213         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 214 }
 215
 216 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 217 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
 218         offset < skb->len &&                                            \
 219         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 220         offset += (ntohs(sch->length) + 3) & ~3, count++)
 221
 222 /* Some validity checks to make sure the chunks are fine */
 223 static int do_basic_checks(struct nf_conn *conntrack,
 224                            const struct sk_buff *skb,
 225                            unsigned int dataoff,
 226                            char *map)
 227 {
 228         u_int32_t offset, count;
 229         sctp_chunkhdr_t _sch, *sch;
 230         int flag;
 231
 232         DEBUGP(__FUNCTION__);
 233         DEBUGP("\n");
 234
 235         flag = 0;
 236
 237         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 238                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 239
 240                 if (sch->type == SCTP_CID_INIT
 241                         || sch->type == SCTP_CID_INIT_ACK
 242                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 243                         flag = 1;
 244                 }
 245
 246                 /*
 247                  * Cookie Ack/Echo chunks not the first OR
 248                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 249                  * OR zero-length.
 250                  */
 251                 if (((sch->type == SCTP_CID_COOKIE_ACK
 252                         || sch->type == SCTP_CID_COOKIE_ECHO
 253                         || flag)
 254                       && count !=0) || !sch->length) {
 255                         DEBUGP("Basic checks failed\n");
 256                         return 1;
 257                 }
 258
 259                 if (map) {
 260                         set_bit(sch->type, (void *)map);
 261                 }
 262         }
 263
 264         DEBUGP("Basic checks passed\n");
 265         return count == 0;
 266 }
 267
 268 static int new_state(enum ip_conntrack_dir dir,
 269                      enum sctp_conntrack cur_state,
 270                      int chunk_type)
 271 {
 272         int i;
 273
 274         DEBUGP(__FUNCTION__);
 275         DEBUGP("\n");
 276
 277         DEBUGP("Chunk type: %d\n", chunk_type);
 278
 279         switch (chunk_type) {
 280                 case SCTP_CID_INIT:
 281                         DEBUGP("SCTP_CID_INIT\n");
 282                         i = 0; break;
 283                 case SCTP_CID_INIT_ACK:
 284                         DEBUGP("SCTP_CID_INIT_ACK\n");
 285                         i = 1; break;
 286                 case SCTP_CID_ABORT:
 287                         DEBUGP("SCTP_CID_ABORT\n");
 288                         i = 2; break;
 289                 case SCTP_CID_SHUTDOWN:
 290                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 291                         i = 3; break;
 292                 case SCTP_CID_SHUTDOWN_ACK:
 293                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 294                         i = 4; break;
 295                 case SCTP_CID_ERROR:
 296                         DEBUGP("SCTP_CID_ERROR\n");
 297                         i = 5; break;
 298                 case SCTP_CID_COOKIE_ECHO:
 299                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 300                         i = 6; break;
 301                 case SCTP_CID_COOKIE_ACK:
 302                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 303                         i = 7; break;
 304                 case SCTP_CID_SHUTDOWN_COMPLETE:
 305                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 306                         i = 8; break;
 307                 default:
 308                         /* Other chunks like DATA, SACK, HEARTBEAT and
 309                         its ACK do not cause a change in state */
 310                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 311                                                 sctp_conntrack_names[cur_state]);
 312                         return cur_state;
 313         }
 314
 315         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 316                         dir, sctp_conntrack_names[cur_state], chunk_type,
 317                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 318
 319         return sctp_conntracks[dir][i][cur_state];
 320 }
 321
 322 /* Returns verdict for packet, or -1 for invalid. */
 323 static int sctp_packet(struct nf_conn *conntrack,
 324                        const struct sk_buff *skb,
 325                        unsigned int dataoff,
 326                        enum ip_conntrack_info ctinfo,
 327                        int pf,
 328                        unsigned int hooknum)
 329 {
 330         enum sctp_conntrack newconntrack, oldsctpstate;
 331         sctp_sctphdr_t _sctph, *sh;
 332         sctp_chunkhdr_t _sch, *sch;
 333         u_int32_t offset, count;
 334         char map[256 / sizeof (char)] = {0};
 335
 336         DEBUGP(__FUNCTION__);
 337         DEBUGP("\n");
 338
 339         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 340         if (sh == NULL)
 341                 return -1;
 342
 343         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 344                 return -1;
 345
 346         /* Check the verification tag (Sec 8.5) */
 347         if (!test_bit(SCTP_CID_INIT, (void *)map)
 348                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 349                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 350                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 351                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 352                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 353                 DEBUGP("Verification tag check failed\n");
 354                 return -1;
 355         }
 356
 357         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 358         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 359                 write_lock_bh(&sctp_lock);
 360
 361                 /* Special cases of Verification tag check (Sec 8.5.1) */
 362                 if (sch->type == SCTP_CID_INIT) {
 363                         /* Sec 8.5.1 (A) */
 364                         if (sh->vtag != 0) {
 365                                 write_unlock_bh(&sctp_lock);
 366                                 return -1;
 367                         }
 368                 } else if (sch->type == SCTP_CID_ABORT) {
 369                         /* Sec 8.5.1 (B) */
 370                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 371                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 372                                                         [1 - CTINFO2DIR(ctinfo)])) {
 373                                 write_unlock_bh(&sctp_lock);
 374                                 return -1;
 375                         }
 376                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 377                         /* Sec 8.5.1 (C) */
 378                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 379                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 380                                                         [1 - CTINFO2DIR(ctinfo)]
 381                                         && (sch->flags & 1))) {
 382                                 write_unlock_bh(&sctp_lock);
 383                                 return -1;
 384                         }
 385                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 386                         /* Sec 8.5.1 (D) */
 387                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 388                                 write_unlock_bh(&sctp_lock);
 389                                 return -1;
 390                         }
 391                 }
 392
 393                 oldsctpstate = conntrack->proto.sctp.state;
 394                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 395
 396                 /* Invalid */
 397                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 398                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 399                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 400                         write_unlock_bh(&sctp_lock);
 401                         return -1;
 402                 }
 403
 404                 /* If it is an INIT or an INIT ACK note down the vtag */
 405                 if (sch->type == SCTP_CID_INIT
 406                         || sch->type == SCTP_CID_INIT_ACK) {
 407                         sctp_inithdr_t _inithdr, *ih;
 408
 409                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 410                                                 sizeof(_inithdr), &_inithdr);
 411                         if (ih == NULL) {
 412                                         write_unlock_bh(&sctp_lock);
 413                                         return -1;
 414                         }
 415                         DEBUGP("Setting vtag %x for dir %d\n",
 416                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 417                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 418                 }
 419
 420                 conntrack->proto.sctp.state = newconntrack;
 421                 if (oldsctpstate != newconntrack)
 422                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 423                 write_unlock_bh(&sctp_lock);
 424         }
 425
 426         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 427
 428         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 429                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 430                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 431                 DEBUGP("Setting assured bit\n");
 432                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 433                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 434         }
 435
 436         return NF_ACCEPT;
 437 }
 438
 439 /* Called when a new connection for this protocol found. */
 440 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 441                     unsigned int dataoff)
 442 {
 443         enum sctp_conntrack newconntrack;
 444         sctp_sctphdr_t _sctph, *sh;
 445         sctp_chunkhdr_t _sch, *sch;
 446         u_int32_t offset, count;
 447         char map[256 / sizeof (char)] = {0};
 448
 449         DEBUGP(__FUNCTION__);
 450         DEBUGP("\n");
 451
 452         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 453         if (sh == NULL)
 454                 return 0;
 455
 456         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 457                 return 0;
 458
 459         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 460         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 461                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 462                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 463                 return 0;
 464         }
 465
 466         newconntrack = SCTP_CONNTRACK_MAX;
 467         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 468                 /* Don't need lock here: this conntrack not in circulation yet */
 469                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 470                                          SCTP_CONNTRACK_NONE, sch->type);
 471
 472                 /* Invalid: delete conntrack */
 473                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 474                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
 475                         return 0;
 476                 }
 477
 478                 /* Copy the vtag into the state info */
 479                 if (sch->type == SCTP_CID_INIT) {
 480                         if (sh->vtag == 0) {
 481                                 sctp_inithdr_t _inithdr, *ih;
 482
 483                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 484                                                         sizeof(_inithdr), &_inithdr);
 485                                 if (ih == NULL)
 486                                         return 0;
 487
 488                                 DEBUGP("Setting vtag %x for new conn\n",
 489                                         ih->init_tag);
 490
 491                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 492                                                                 ih->init_tag;
 493                         } else {
 494                                 /* Sec 8.5.1 (A) */
 495                                 return 0;
 496                         }
 497                 }
 498                 /* If it is a shutdown ack OOTB packet, we expect a return
 499                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 500                 else {
 501                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 502                                 sh->vtag);
 503                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 504                 }
 505
 506                 conntrack->proto.sctp.state = newconntrack;
 507         }
 508
 509         return 1;
 510 }
 511
 512 #ifdef CONFIG_SYSCTL
 513 static unsigned int sctp_sysctl_table_users;
 514 static struct ctl_table_header *sctp_sysctl_header;
 515 static struct ctl_table sctp_sysctl_table[] = {
 516         {
 517                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 518                 .procname       = "nf_conntrack_sctp_timeout_closed",
 519                 .data           = &nf_ct_sctp_timeout_closed,
 520                 .maxlen         = sizeof(unsigned int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec_jiffies,
 523         },
 524         {
 525                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 526                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 527                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 528                 .maxlen         = sizeof(unsigned int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec_jiffies,
 531         },
 532         {
 533                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 534                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 535                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 536                 .maxlen         = sizeof(unsigned int),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec_jiffies,
 539         },
 540         {
 541                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 542                 .procname       = "nf_conntrack_sctp_timeout_established",
 543                 .data           = &nf_ct_sctp_timeout_established,
 544                 .maxlen         = sizeof(unsigned int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec_jiffies,
 547         },
 548         {
 549                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 550                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 551                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 552                 .maxlen         = sizeof(unsigned int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec_jiffies,
 555         },
 556         {
 557                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 558                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 559                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 560                 .maxlen         = sizeof(unsigned int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec_jiffies,
 563         },
 564         {
 565                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 566                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 567                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec_jiffies,
 571         },
 572         {
 573                 .ctl_name = 0
 574         }
 575 };
 576
 577 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 578 static struct ctl_table sctp_compat_sysctl_table[] = {
 579         {
 580                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 581                 .procname       = "ip_conntrack_sctp_timeout_closed",
 582                 .data           = &nf_ct_sctp_timeout_closed,
 583                 .maxlen         = sizeof(unsigned int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_jiffies,
 586         },
 587         {
 588                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 589                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 590                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 591                 .maxlen         = sizeof(unsigned int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_jiffies,
 594         },
 595         {
 596                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 597                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 598                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 599                 .maxlen         = sizeof(unsigned int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec_jiffies,
 602         },
 603         {
 604                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 605                 .procname       = "ip_conntrack_sctp_timeout_established",
 606                 .data           = &nf_ct_sctp_timeout_established,
 607                 .maxlen         = sizeof(unsigned int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec_jiffies,
 610         },
 611         {
 612                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 613                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 614                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 615                 .maxlen         = sizeof(unsigned int),
 616                 .mode           = 0644,
 617                 .proc_handler   = &proc_dointvec_jiffies,
 618         },
 619         {
 620                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 621                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 622                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 623                 .maxlen         = sizeof(unsigned int),
 624                 .mode           = 0644,
 625                 .proc_handler   = &proc_dointvec_jiffies,
 626         },
 627         {
 628                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 629                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 630                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 631                 .maxlen         = sizeof(unsigned int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec_jiffies,
 634         },
 635         {
 636                 .ctl_name = 0
 637         }
 638 };
 639 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 640 #endif
 641
 642 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
 643         .l3proto                = PF_INET,
 644         .l4proto                = IPPROTO_SCTP,
 645         .name                   = "sctp",
 646         .pkt_to_tuple           = sctp_pkt_to_tuple,
 647         .invert_tuple           = sctp_invert_tuple,
 648         .print_tuple            = sctp_print_tuple,
 649         .print_conntrack        = sctp_print_conntrack,
 650         .packet                 = sctp_packet,
 651         .new                    = sctp_new,
 652         .me                     = THIS_MODULE,
 653 #ifdef CONFIG_SYSCTL
 654         .ctl_table_users        = &sctp_sysctl_table_users,
 655         .ctl_table_header       = &sctp_sysctl_header,
 656         .ctl_table              = sctp_sysctl_table,
 657 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 658         .ctl_compat_table       = sctp_compat_sysctl_table,
 659 #endif
 660 #endif
 661 };
 662
 663 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 = {
 664         .l3proto                = PF_INET6,
 665         .l4proto                = IPPROTO_SCTP,
 666         .name                   = "sctp",
 667         .pkt_to_tuple           = sctp_pkt_to_tuple,
 668         .invert_tuple           = sctp_invert_tuple,
 669         .print_tuple            = sctp_print_tuple,
 670         .print_conntrack        = sctp_print_conntrack,
 671         .packet                 = sctp_packet,
 672         .new                    = sctp_new,
 673         .me                     = THIS_MODULE,
 674 #ifdef CONFIG_SYSCTL
 675         .ctl_table_users        = &sctp_sysctl_table_users,
 676         .ctl_table_header       = &sctp_sysctl_header,
 677         .ctl_table              = sctp_sysctl_table,
 678 #endif
 679 };
 680
 681 int __init nf_conntrack_proto_sctp_init(void)
 682 {
 683         int ret;
 684
 685         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 686         if (ret) {
 687                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 688                 goto out;
 689         }
 690         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 691         if (ret) {
 692                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 693                 goto cleanup_sctp4;
 694         }
 695
 696         return ret;
 697
 698  cleanup_sctp4:
 699         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 700  out:
 701         DEBUGP("SCTP conntrack module loading %s\n",
 702                                         ret ? "failed": "succeeded");
 703         return ret;
 704 }
 705
 706 void __exit nf_conntrack_proto_sctp_fini(void)
 707 {
 708         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 709         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 710         DEBUGP("SCTP conntrack module unloaded\n");
 711 }
 712
 713 module_init(nf_conntrack_proto_sctp_init);
 714 module_exit(nf_conntrack_proto_sctp_fini);
 715
 716 MODULE_LICENSE("GPL");
 717 MODULE_AUTHOR("Kiran Kumar Immidi");
 718 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 719 MODULE_ALIAS("ip_conntrack_proto_sctp");