net/ipv4/netfilter/ip_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 /*
  13  * Added support for proc manipulation of timeouts.
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/sched.h>
  18 #include <linux/timer.h>
  19 #include <linux/netfilter.h>
  20 #include <linux/module.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/sctp.h>
  24 #include <linux/string.h>
  25 #include <linux/seq_file.h>
  26
  27 #include <linux/netfilter_ipv4/ip_conntrack.h>
  28 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  29 #include <linux/netfilter_ipv4/lockhelp.h>
  30
  31 #if 0
  32 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  33 #else
  34 #define DEBUGP(format, args...)
  35 #endif
  36
  37 /* Protects conntrack->proto.sctp */
  38 static DECLARE_RWLOCK(sctp_lock);
  39
  40 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  41    closely.  They're more complex. --RR
  42
  43    And so for me for SCTP :D -Kiran */
  44
  45 static const char *sctp_conntrack_names[] = {
  46         "NONE",
  47         "CLOSED",
  48         "COOKIE_WAIT",
  49         "COOKIE_ECHOED",
  50         "ESTABLISHED",
  51         "SHUTDOWN_SENT",
  52         "SHUTDOWN_RECD",
  53         "SHUTDOWN_ACK_SENT",
  54 };
  55
  56 #define SECS  * HZ
  57 #define MINS  * 60 SECS
  58 #define HOURS * 60 MINS
  59 #define DAYS  * 24 HOURS
  60
  61 static unsigned long ip_ct_sctp_timeout_closed            =  10 SECS;
  62 static unsigned long ip_ct_sctp_timeout_cookie_wait       =   3 SECS;
  63 static unsigned long ip_ct_sctp_timeout_cookie_echoed     =   3 SECS;
  64 #if HZ < 9942
  65 static unsigned long ip_ct_sctp_timeout_established       =  5U DAYS;
  66 #else
  67 static unsigned long ip_ct_sctp_timeout_established       =  2U DAYS;
  68 #endif
  69 static unsigned long ip_ct_sctp_timeout_shutdown_sent     = 300 SECS / 1000;
  70 static unsigned long ip_ct_sctp_timeout_shutdown_recd     = 300 SECS / 1000;
  71 static unsigned long ip_ct_sctp_timeout_shutdown_ack_sent =   3 SECS;
  72
  73 static unsigned long * sctp_timeouts[]
  74 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  75     &ip_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  76     &ip_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  77     &ip_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  78     &ip_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  79     &ip_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  80     &ip_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  81     &ip_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  82  };
  83
  84 #define sNO SCTP_CONNTRACK_NONE
  85 #define sCL SCTP_CONNTRACK_CLOSED
  86 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  87 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  88 #define sES SCTP_CONNTRACK_ESTABLISHED
  89 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  90 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  91 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  92 #define sIV SCTP_CONNTRACK_MAX
  93
  94 /*
  95         These are the descriptions of the states:
  96
  97 NOTE: These state names are tantalizingly similar to the states of an
  98 SCTP endpoint. But the interpretation of the states is a little different,
  99 considering that these are the states of the connection and not of an end
 100 point. Please note the subtleties. -Kiran
 101
 102 NONE              - Nothing so far.
 103 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
 104                     an INIT_ACK chunk in the reply direction.
 105 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 106 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 107 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 108 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 109 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 110                     to that of the SHUTDOWN chunk.
 111 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 112                     the SHUTDOWN chunk. Connection is closed.
 113 */
 114
 115 /* TODO
 116  - I have assumed that the first INIT is in the original direction.
 117  This messes things when an INIT comes in the reply direction in CLOSED
 118  state.
 119  - Check the error type in the reply dir before transitioning from
 120 cookie echoed to closed.
 121  - Sec 5.2.4 of RFC 2960
 122  - Multi Homing support.
 123 */
 124
 125 /* SCTP conntrack state transitions */
 126 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 127         {
 128 /*      ORIGINAL        */
 129 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 130 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 131 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 132 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 133 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 134 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 135 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 136 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 137 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 138 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 139         },
 140         {
 141 /*      REPLY   */
 142 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 143 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 144 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 145 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 146 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 147 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 148 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 149 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 150 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 151 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 152         }
 153 };
 154
 155 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 156                              unsigned int dataoff,
 157                              struct ip_conntrack_tuple *tuple)
 158 {
 159         sctp_sctphdr_t _hdr, *hp;
 160
 161         DEBUGP(__FUNCTION__);
 162         DEBUGP("\n");
 163
 164         /* Actually only need first 8 bytes. */
 165         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 166         if (hp == NULL)
 167                 return 0;
 168
 169         tuple->src.u.sctp.port = hp->source;
 170         tuple->dst.u.sctp.port = hp->dest;
 171         return 1;
 172 }
 173
 174 static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
 175                              const struct ip_conntrack_tuple *orig)
 176 {
 177         DEBUGP(__FUNCTION__);
 178         DEBUGP("\n");
 179
 180         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 181         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 182         return 1;
 183 }
 184
 185 /* Print out the per-protocol part of the tuple. */
 186 static int sctp_print_tuple(struct seq_file *s,
 187                             const struct ip_conntrack_tuple *tuple)
 188 {
 189         DEBUGP(__FUNCTION__);
 190         DEBUGP("\n");
 191
 192         return seq_printf(s, "sport=%hu dport=%hu ",
 193                           ntohs(tuple->src.u.sctp.port),
 194                           ntohs(tuple->dst.u.sctp.port));
 195 }
 196
 197 /* Print out the private part of the conntrack. */
 198 static int sctp_print_conntrack(struct seq_file *s,
 199                                 const struct ip_conntrack *conntrack)
 200 {
 201         enum sctp_conntrack state;
 202
 203         DEBUGP(__FUNCTION__);
 204         DEBUGP("\n");
 205
 206         READ_LOCK(&sctp_lock);
 207         state = conntrack->proto.sctp.state;
 208         READ_UNLOCK(&sctp_lock);
 209
 210         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 211 }
 212
 213 #define for_each_sctp_chunk(skb, sch, _sch, offset, count)              \
 214 for (offset = skb->nh.iph->ihl * 4 + sizeof(sctp_sctphdr_t), count = 0; \
 215         offset < skb->len &&                                            \
 216         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 217         offset += (htons(sch->length) + 3) & ~3, count++)
 218
 219 /* Some validity checks to make sure the chunks are fine */
 220 static int do_basic_checks(struct ip_conntrack *conntrack,
 221                            const struct sk_buff *skb,
 222                            char *map)
 223 {
 224         u_int32_t offset, count;
 225         sctp_chunkhdr_t _sch, *sch;
 226         int flag;
 227
 228         DEBUGP(__FUNCTION__);
 229         DEBUGP("\n");
 230
 231         flag = 0;
 232
 233         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 234                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 235
 236                 if (sch->type == SCTP_CID_INIT
 237                         || sch->type == SCTP_CID_INIT_ACK
 238                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 239                         flag = 1;
 240                 }
 241
 242                 /* Cookie Ack/Echo chunks not the first OR
 243                    Init / Init Ack / Shutdown compl chunks not the only chunks */
 244                 if ((sch->type == SCTP_CID_COOKIE_ACK
 245                         || sch->type == SCTP_CID_COOKIE_ECHO
 246                         || flag)
 247                      && count !=0 ) {
 248                         DEBUGP("Basic checks failed\n");
 249                         return 1;
 250                 }
 251
 252                 if (map) {
 253                         set_bit(sch->type, (void *)map);
 254                 }
 255         }
 256
 257         DEBUGP("Basic checks passed\n");
 258         return 0;
 259 }
 260
 261 static int new_state(enum ip_conntrack_dir dir,
 262                      enum sctp_conntrack cur_state,
 263                      int chunk_type)
 264 {
 265         int i;
 266
 267         DEBUGP(__FUNCTION__);
 268         DEBUGP("\n");
 269
 270         DEBUGP("Chunk type: %d\n", chunk_type);
 271
 272         switch (chunk_type) {
 273                 case SCTP_CID_INIT:
 274                         DEBUGP("SCTP_CID_INIT\n");
 275                         i = 0; break;
 276                 case SCTP_CID_INIT_ACK:
 277                         DEBUGP("SCTP_CID_INIT_ACK\n");
 278                         i = 1; break;
 279                 case SCTP_CID_ABORT:
 280                         DEBUGP("SCTP_CID_ABORT\n");
 281                         i = 2; break;
 282                 case SCTP_CID_SHUTDOWN:
 283                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 284                         i = 3; break;
 285                 case SCTP_CID_SHUTDOWN_ACK:
 286                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 287                         i = 4; break;
 288                 case SCTP_CID_ERROR:
 289                         DEBUGP("SCTP_CID_ERROR\n");
 290                         i = 5; break;
 291                 case SCTP_CID_COOKIE_ECHO:
 292                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 293                         i = 6; break;
 294                 case SCTP_CID_COOKIE_ACK:
 295                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 296                         i = 7; break;
 297                 case SCTP_CID_SHUTDOWN_COMPLETE:
 298                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 299                         i = 8; break;
 300                 default:
 301                         /* Other chunks like DATA, SACK, HEARTBEAT and
 302                         its ACK do not cause a change in state */
 303                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 304                                                 sctp_conntrack_names[cur_state]);
 305                         return cur_state;
 306         }
 307
 308         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 309                         dir, sctp_conntrack_names[cur_state], chunk_type,
 310                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 311
 312         return sctp_conntracks[dir][i][cur_state];
 313 }
 314
 315 /* Returns verdict for packet, or -1 for invalid. */
 316 static int sctp_packet(struct ip_conntrack *conntrack,
 317                        const struct sk_buff *skb,
 318                        enum ip_conntrack_info ctinfo)
 319 {
 320         enum sctp_conntrack newconntrack, oldsctpstate;
 321         struct iphdr *iph = skb->nh.iph;
 322         sctp_sctphdr_t _sctph, *sh;
 323         sctp_chunkhdr_t _sch, *sch;
 324         u_int32_t offset, count;
 325         char map[256 / sizeof (char)] = {0};
 326
 327         DEBUGP(__FUNCTION__);
 328         DEBUGP("\n");
 329
 330         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 331         if (sh == NULL)
 332                 return -1;
 333
 334         if (do_basic_checks(conntrack, skb, map) != 0)
 335                 return -1;
 336
 337         /* Check the verification tag (Sec 8.5) */
 338         if (!test_bit(SCTP_CID_INIT, (void *)map)
 339                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 340                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 341                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 342                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 343                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 344                 DEBUGP("Verification tag check failed\n");
 345                 return -1;
 346         }
 347
 348         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 349         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 350                 WRITE_LOCK(&sctp_lock);
 351
 352                 /* Special cases of Verification tag check (Sec 8.5.1) */
 353                 if (sch->type == SCTP_CID_INIT) {
 354                         /* Sec 8.5.1 (A) */
 355                         if (sh->vtag != 0) {
 356                                 WRITE_UNLOCK(&sctp_lock);
 357                                 return -1;
 358                         }
 359                 } else if (sch->type == SCTP_CID_ABORT) {
 360                         /* Sec 8.5.1 (B) */
 361                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 362                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 363                                                         [1 - CTINFO2DIR(ctinfo)])) {
 364                                 WRITE_UNLOCK(&sctp_lock);
 365                                 return -1;
 366                         }
 367                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 368                         /* Sec 8.5.1 (C) */
 369                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 370                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 371                                                         [1 - CTINFO2DIR(ctinfo)]
 372                                         && (sch->flags & 1))) {
 373                                 WRITE_UNLOCK(&sctp_lock);
 374                                 return -1;
 375                         }
 376                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 377                         /* Sec 8.5.1 (D) */
 378                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 379                                 WRITE_UNLOCK(&sctp_lock);
 380                                 return -1;
 381                         }
 382                 }
 383
 384                 oldsctpstate = conntrack->proto.sctp.state;
 385                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 386
 387                 /* Invalid */
 388                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 389                         DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 390                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 391                         WRITE_UNLOCK(&sctp_lock);
 392                         return -1;
 393                 }
 394
 395                 /* If it is an INIT or an INIT ACK note down the vtag */
 396                 if (sch->type == SCTP_CID_INIT
 397                         || sch->type == SCTP_CID_INIT_ACK) {
 398                         sctp_inithdr_t _inithdr, *ih;
 399
 400                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 401                                                 sizeof(_inithdr), &_inithdr);
 402                         if (ih == NULL) {
 403                                         WRITE_UNLOCK(&sctp_lock);
 404                                         return -1;
 405                         }
 406                         DEBUGP("Setting vtag %x for dir %d\n",
 407                                         ih->init_tag, CTINFO2DIR(ctinfo));
 408                         conntrack->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = ih->init_tag;
 409                 }
 410
 411                 conntrack->proto.sctp.state = newconntrack;
 412                 WRITE_UNLOCK(&sctp_lock);
 413         }
 414
 415         ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 416
 417         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 418                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 419                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 420                 DEBUGP("Setting assured bit\n");
 421                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 422         }
 423
 424         return NF_ACCEPT;
 425 }
 426
 427 /* Called when a new connection for this protocol found. */
 428 static int sctp_new(struct ip_conntrack *conntrack,
 429                     const struct sk_buff *skb)
 430 {
 431         enum sctp_conntrack newconntrack;
 432         struct iphdr *iph = skb->nh.iph;
 433         sctp_sctphdr_t _sctph, *sh;
 434         sctp_chunkhdr_t _sch, *sch;
 435         u_int32_t offset, count;
 436         char map[256 / sizeof (char)] = {0};
 437
 438         DEBUGP(__FUNCTION__);
 439         DEBUGP("\n");
 440
 441         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
 442         if (sh == NULL)
 443                 return 0;
 444
 445         if (do_basic_checks(conntrack, skb, map) != 0)
 446                 return 0;
 447
 448         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 449         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 450                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 451                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 452                 return 0;
 453         }
 454
 455         newconntrack = SCTP_CONNTRACK_MAX;
 456         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
 457                 /* Don't need lock here: this conntrack not in circulation yet */
 458                 newconntrack = new_state (IP_CT_DIR_ORIGINAL,
 459                                                 SCTP_CONNTRACK_NONE, sch->type);
 460
 461                 /* Invalid: delete conntrack */
 462                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 463                         DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
 464                         return 0;
 465                 }
 466
 467                 /* Copy the vtag into the state info */
 468                 if (sch->type == SCTP_CID_INIT) {
 469                         if (sh->vtag == 0) {
 470                                 sctp_inithdr_t _inithdr, *ih;
 471
 472                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 473                                                         sizeof(_inithdr), &_inithdr);
 474                                 if (ih == NULL)
 475                                         return 0;
 476
 477                                 DEBUGP("Setting vtag %x for new conn\n",
 478                                         ih->init_tag);
 479
 480                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 481                                                                 ih->init_tag;
 482                         } else {
 483                                 /* Sec 8.5.1 (A) */
 484                                 return 0;
 485                         }
 486                 }
 487                 /* If it is a shutdown ack OOTB packet, we expect a return
 488                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 489                 else {
 490                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 491                                 sh->vtag);
 492                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 493                 }
 494
 495                 conntrack->proto.sctp.state = newconntrack;
 496         }
 497
 498         return 1;
 499 }
 500
 501 static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
 502         .proto           = IPPROTO_SCTP,
 503         .name            = "sctp",
 504         .pkt_to_tuple    = sctp_pkt_to_tuple,
 505         .invert_tuple    = sctp_invert_tuple,
 506         .print_tuple     = sctp_print_tuple,
 507         .print_conntrack = sctp_print_conntrack,
 508         .packet          = sctp_packet,
 509         .new             = sctp_new,
 510         .destroy         = NULL,
 511         .me              = THIS_MODULE
 512 };
 513
 514 #ifdef CONFIG_SYSCTL
 515 static ctl_table ip_ct_sysctl_table[] = {
 516         {
 517                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 518                 .procname       = "ip_conntrack_sctp_timeout_closed",
 519                 .data           = &ip_ct_sctp_timeout_closed,
 520                 .maxlen         = sizeof(unsigned int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec_jiffies,
 523         },
 524         {
 525                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 526                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 527                 .data           = &ip_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_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 534                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 535                 .data           = &ip_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_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 542                 .procname       = "ip_conntrack_sctp_timeout_established",
 543                 .data           = &ip_ct_sctp_timeout_established,
 544                 .maxlen         = sizeof(unsigned int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec_jiffies,
 547         },
 548         {
 549                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 550                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 551                 .data           = &ip_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_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 558                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 559                 .data           = &ip_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_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 566                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 567                 .data           = &ip_ct_sctp_timeout_shutdown_ack_sent,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec_jiffies,
 571         },
 572         { .ctl_name = 0 }
 573 };
 574
 575 static ctl_table ip_ct_netfilter_table[] = {
 576         {
 577                 .ctl_name       = NET_IPV4_NETFILTER,
 578                 .procname       = "netfilter",
 579                 .mode           = 0555,
 580                 .child          = ip_ct_sysctl_table,
 581         },
 582         { .ctl_name = 0 }
 583 };
 584
 585 static ctl_table ip_ct_ipv4_table[] = {
 586         {
 587                 .ctl_name       = NET_IPV4,
 588                 .procname       = "ipv4",
 589                 .mode           = 0555,
 590                 .child          = ip_ct_netfilter_table,
 591         },
 592         { .ctl_name = 0 }
 593 };
 594
 595 static ctl_table ip_ct_net_table[] = {
 596         {
 597                 .ctl_name       = CTL_NET,
 598                 .procname       = "net",
 599                 .mode           = 0555,
 600                 .child          = ip_ct_ipv4_table,
 601         },
 602         { .ctl_name = 0 }
 603 };
 604
 605 static struct ctl_table_header *ip_ct_sysctl_header;
 606 #endif
 607
 608 static int __init init(void)
 609 {
 610         int ret;
 611
 612         ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
 613         if (ret) {
 614                 printk("ip_conntrack_proto_sctp: protocol register failed\n");
 615                 goto out;
 616         }
 617
 618 #ifdef CONFIG_SYSCTL
 619         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 620         if (ip_ct_sysctl_header == NULL) {
 621                 ret = -ENOMEM;
 622                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
 623                 goto cleanup;
 624         }
 625 #endif
 626
 627         return ret;
 628
 629 #ifdef CONFIG_SYSCTL
 630  cleanup:
 631         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 632 #endif
 633  out:
 634         DEBUGP("SCTP conntrack module loading %s\n",
 635                                         ret ? "failed": "succeeded");
 636         return ret;
 637 }
 638
 639 static void __exit fini(void)
 640 {
 641         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
 642 #ifdef CONFIG_SYSCTL
 643         unregister_sysctl_table(ip_ct_sysctl_header);
 644 #endif
 645         DEBUGP("SCTP conntrack module unloaded\n");
 646 }
 647
 648 module_init(init);
 649 module_exit(fini);
 650
 651 MODULE_LICENSE("GPL");
 652 MODULE_AUTHOR("Kiran Kumar Immidi");
 653 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");