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_protocol.h>
  36
  37 #if 0
  38 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
  39 #else
  40 #define DEBUGP(format, args...)
  41 #endif
  42
  43 /* Protects conntrack->proto.sctp */
  44 static DEFINE_RWLOCK(sctp_lock);
  45
  46 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  47    closely.  They're more complex. --RR
  48
  49    And so for me for SCTP :D -Kiran */
  50
  51 static const char *sctp_conntrack_names[] = {
  52         "NONE",
  53         "CLOSED",
  54         "COOKIE_WAIT",
  55         "COOKIE_ECHOED",
  56         "ESTABLISHED",
  57         "SHUTDOWN_SENT",
  58         "SHUTDOWN_RECD",
  59         "SHUTDOWN_ACK_SENT",
  60 };
  61
  62 #define SECS  * HZ
  63 #define MINS  * 60 SECS
  64 #define HOURS * 60 MINS
  65 #define DAYS  * 24 HOURS
  66
  67 static unsigned int nf_ct_sctp_timeout_closed            =  10 SECS;
  68 static unsigned int nf_ct_sctp_timeout_cookie_wait       =   3 SECS;
  69 static unsigned int nf_ct_sctp_timeout_cookie_echoed     =   3 SECS;
  70 static unsigned int nf_ct_sctp_timeout_established       =   5 DAYS;
  71 static unsigned int nf_ct_sctp_timeout_shutdown_sent     = 300 SECS / 1000;
  72 static unsigned int nf_ct_sctp_timeout_shutdown_recd     = 300 SECS / 1000;
  73 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent =   3 SECS;
  74
  75 static unsigned int * sctp_timeouts[]
  76 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  77     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  78     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  79     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  80     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  81     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  82     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  83     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  84  };
  85
  86 #define sNO SCTP_CONNTRACK_NONE
  87 #define sCL SCTP_CONNTRACK_CLOSED
  88 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  89 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  90 #define sES SCTP_CONNTRACK_ESTABLISHED
  91 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  92 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  93 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  94 #define sIV SCTP_CONNTRACK_MAX
  95
  96 /*
  97         These are the descriptions of the states:
  98
  99 NOTE: These state names are tantalizingly similar to the states of an
 100 SCTP endpoint. But the interpretation of the states is a little different,
 101 considering that these are the states of the connection and not of an end
 102 point. Please note the subtleties. -Kiran
 103
 104 NONE              - Nothing so far.
 105 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
 106                     an INIT_ACK chunk in the reply direction.
 107 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
 108 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
 109 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
 110 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
 111 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
 112                     to that of the SHUTDOWN chunk.
 113 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
 114                     the SHUTDOWN chunk. Connection is closed.
 115 */
 116
 117 /* TODO
 118  - I have assumed that the first INIT is in the original direction.
 119  This messes things when an INIT comes in the reply direction in CLOSED
 120  state.
 121  - Check the error type in the reply dir before transitioning from
 122 cookie echoed to closed.
 123  - Sec 5.2.4 of RFC 2960
 124  - Multi Homing support.
 125 */
 126
 127 /* SCTP conntrack state transitions */
 128 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 129         {
 130 /*      ORIGINAL        */
 131 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 132 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 133 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 134 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 135 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 136 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 137 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 138 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 139 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 140 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 141         },
 142         {
 143 /*      REPLY   */
 144 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 145 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 146 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 147 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 148 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 149 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 150 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 151 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 152 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 153 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 154         }
 155 };
 156
 157 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 158                              unsigned int dataoff,
 159                              struct nf_conntrack_tuple *tuple)
 160 {
 161         sctp_sctphdr_t _hdr, *hp;
 162
 163         DEBUGP(__FUNCTION__);
 164         DEBUGP("\n");
 165
 166         /* Actually only need first 8 bytes. */
 167         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 168         if (hp == NULL)
 169                 return 0;
 170
 171         tuple->src.u.sctp.port = hp->source;
 172         tuple->dst.u.sctp.port = hp->dest;
 173         return 1;
 174 }
 175
 176 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 177                              const struct nf_conntrack_tuple *orig)
 178 {
 179         DEBUGP(__FUNCTION__);
 180         DEBUGP("\n");
 181
 182         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 183         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 184         return 1;
 185 }
 186
 187 /* Print out the per-protocol part of the tuple. */
 188 static int sctp_print_tuple(struct seq_file *s,
 189                             const struct nf_conntrack_tuple *tuple)
 190 {
 191         DEBUGP(__FUNCTION__);
 192         DEBUGP("\n");
 193
 194         return seq_printf(s, "sport=%hu dport=%hu ",
 195                           ntohs(tuple->src.u.sctp.port),
 196                           ntohs(tuple->dst.u.sctp.port));
 197 }
 198
 199 /* Print out the private part of the conntrack. */
 200 static int sctp_print_conntrack(struct seq_file *s,
 201                                 const struct nf_conn *conntrack)
 202 {
 203         enum sctp_conntrack state;
 204
 205         DEBUGP(__FUNCTION__);
 206         DEBUGP("\n");
 207
 208         read_lock_bh(&sctp_lock);
 209         state = conntrack->proto.sctp.state;
 210         read_unlock_bh(&sctp_lock);
 211
 212         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 213 }
 214
 215 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 216 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
 217         offset < skb->len &&                                            \
 218         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
 219         offset += (htons(sch->length) + 3) & ~3, count++)
 220
 221 /* Some validity checks to make sure the chunks are fine */
 222 static int do_basic_checks(struct nf_conn *conntrack,
 223                            const struct sk_buff *skb,
 224                            unsigned int dataoff,
 225                            char *map)
 226 {
 227         u_int32_t offset, count;
 228         sctp_chunkhdr_t _sch, *sch;
 229         int flag;
 230
 231         DEBUGP(__FUNCTION__);
 232         DEBUGP("\n");
 233
 234         flag = 0;
 235
 236         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 237                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
 238
 239                 if (sch->type == SCTP_CID_INIT
 240                         || sch->type == SCTP_CID_INIT_ACK
 241                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 242                         flag = 1;
 243                 }
 244
 245                 /*
 246                  * Cookie Ack/Echo chunks not the first OR
 247                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 248                  * OR zero-length.
 249                  */
 250                 if (((sch->type == SCTP_CID_COOKIE_ACK
 251                         || sch->type == SCTP_CID_COOKIE_ECHO
 252                         || flag)
 253                       && count !=0) || !sch->length) {
 254                         DEBUGP("Basic checks failed\n");
 255                         return 1;
 256                 }
 257
 258                 if (map) {
 259                         set_bit(sch->type, (void *)map);
 260                 }
 261         }
 262
 263         DEBUGP("Basic checks passed\n");
 264         return count == 0;
 265 }
 266
 267 static int new_state(enum ip_conntrack_dir dir,
 268                      enum sctp_conntrack cur_state,
 269                      int chunk_type)
 270 {
 271         int i;
 272
 273         DEBUGP(__FUNCTION__);
 274         DEBUGP("\n");
 275
 276         DEBUGP("Chunk type: %d\n", chunk_type);
 277
 278         switch (chunk_type) {
 279                 case SCTP_CID_INIT:
 280                         DEBUGP("SCTP_CID_INIT\n");
 281                         i = 0; break;
 282                 case SCTP_CID_INIT_ACK:
 283                         DEBUGP("SCTP_CID_INIT_ACK\n");
 284                         i = 1; break;
 285                 case SCTP_CID_ABORT:
 286                         DEBUGP("SCTP_CID_ABORT\n");
 287                         i = 2; break;
 288                 case SCTP_CID_SHUTDOWN:
 289                         DEBUGP("SCTP_CID_SHUTDOWN\n");
 290                         i = 3; break;
 291                 case SCTP_CID_SHUTDOWN_ACK:
 292                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
 293                         i = 4; break;
 294                 case SCTP_CID_ERROR:
 295                         DEBUGP("SCTP_CID_ERROR\n");
 296                         i = 5; break;
 297                 case SCTP_CID_COOKIE_ECHO:
 298                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
 299                         i = 6; break;
 300                 case SCTP_CID_COOKIE_ACK:
 301                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
 302                         i = 7; break;
 303                 case SCTP_CID_SHUTDOWN_COMPLETE:
 304                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
 305                         i = 8; break;
 306                 default:
 307                         /* Other chunks like DATA, SACK, HEARTBEAT and
 308                         its ACK do not cause a change in state */
 309                         DEBUGP("Unknown chunk type, Will stay in %s\n",
 310                                                 sctp_conntrack_names[cur_state]);
 311                         return cur_state;
 312         }
 313
 314         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 315                         dir, sctp_conntrack_names[cur_state], chunk_type,
 316                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 317
 318         return sctp_conntracks[dir][i][cur_state];
 319 }
 320
 321 /* Returns verdict for packet, or -1 for invalid. */
 322 static int sctp_packet(struct nf_conn *conntrack,
 323                        const struct sk_buff *skb,
 324                        unsigned int dataoff,
 325                        enum ip_conntrack_info ctinfo,
 326                        int pf,
 327                        unsigned int hooknum)
 328 {
 329         enum sctp_conntrack newconntrack, oldsctpstate;
 330         sctp_sctphdr_t _sctph, *sh;
 331         sctp_chunkhdr_t _sch, *sch;
 332         u_int32_t offset, count;
 333         char map[256 / sizeof (char)] = {0};
 334
 335         DEBUGP(__FUNCTION__);
 336         DEBUGP("\n");
 337
 338         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 339         if (sh == NULL)
 340                 return -1;
 341
 342         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 343                 return -1;
 344
 345         /* Check the verification tag (Sec 8.5) */
 346         if (!test_bit(SCTP_CID_INIT, (void *)map)
 347                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
 348                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
 349                 && !test_bit(SCTP_CID_ABORT, (void *)map)
 350                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
 351                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 352                 DEBUGP("Verification tag check failed\n");
 353                 return -1;
 354         }
 355
 356         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
 357         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 358                 write_lock_bh(&sctp_lock);
 359
 360                 /* Special cases of Verification tag check (Sec 8.5.1) */
 361                 if (sch->type == SCTP_CID_INIT) {
 362                         /* Sec 8.5.1 (A) */
 363                         if (sh->vtag != 0) {
 364                                 write_unlock_bh(&sctp_lock);
 365                                 return -1;
 366                         }
 367                 } else if (sch->type == SCTP_CID_ABORT) {
 368                         /* Sec 8.5.1 (B) */
 369                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 370                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 371                                                         [1 - CTINFO2DIR(ctinfo)])) {
 372                                 write_unlock_bh(&sctp_lock);
 373                                 return -1;
 374                         }
 375                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 376                         /* Sec 8.5.1 (C) */
 377                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
 378                                 && !(sh->vtag == conntrack->proto.sctp.vtag
 379                                                         [1 - CTINFO2DIR(ctinfo)]
 380                                         && (sch->flags & 1))) {
 381                                 write_unlock_bh(&sctp_lock);
 382                                 return -1;
 383                         }
 384                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 385                         /* Sec 8.5.1 (D) */
 386                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
 387                                 write_unlock_bh(&sctp_lock);
 388                                 return -1;
 389                         }
 390                 }
 391
 392                 oldsctpstate = conntrack->proto.sctp.state;
 393                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
 394
 395                 /* Invalid */
 396                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 397                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
 398                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
 399                         write_unlock_bh(&sctp_lock);
 400                         return -1;
 401                 }
 402
 403                 /* If it is an INIT or an INIT ACK note down the vtag */
 404                 if (sch->type == SCTP_CID_INIT
 405                         || sch->type == SCTP_CID_INIT_ACK) {
 406                         sctp_inithdr_t _inithdr, *ih;
 407
 408                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 409                                                 sizeof(_inithdr), &_inithdr);
 410                         if (ih == NULL) {
 411                                         write_unlock_bh(&sctp_lock);
 412                                         return -1;
 413                         }
 414                         DEBUGP("Setting vtag %x for dir %d\n",
 415                                         ih->init_tag, !CTINFO2DIR(ctinfo));
 416                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
 417                 }
 418
 419                 conntrack->proto.sctp.state = newconntrack;
 420                 if (oldsctpstate != newconntrack)
 421                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 422                 write_unlock_bh(&sctp_lock);
 423         }
 424
 425         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
 426
 427         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
 428                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
 429                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
 430                 DEBUGP("Setting assured bit\n");
 431                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
 432                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 433         }
 434
 435         return NF_ACCEPT;
 436 }
 437
 438 /* Called when a new connection for this protocol found. */
 439 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
 440                     unsigned int dataoff)
 441 {
 442         enum sctp_conntrack newconntrack;
 443         sctp_sctphdr_t _sctph, *sh;
 444         sctp_chunkhdr_t _sch, *sch;
 445         u_int32_t offset, count;
 446         char map[256 / sizeof (char)] = {0};
 447
 448         DEBUGP(__FUNCTION__);
 449         DEBUGP("\n");
 450
 451         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 452         if (sh == NULL)
 453                 return 0;
 454
 455         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
 456                 return 0;
 457
 458         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 459         if ((test_bit (SCTP_CID_ABORT, (void *)map))
 460                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
 461                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
 462                 return 0;
 463         }
 464
 465         newconntrack = SCTP_CONNTRACK_MAX;
 466         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 467                 /* Don't need lock here: this conntrack not in circulation yet */
 468                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
 469                                          SCTP_CONNTRACK_NONE, sch->type);
 470
 471                 /* Invalid: delete conntrack */
 472                 if (newconntrack == SCTP_CONNTRACK_MAX) {
 473                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
 474                         return 0;
 475                 }
 476
 477                 /* Copy the vtag into the state info */
 478                 if (sch->type == SCTP_CID_INIT) {
 479                         if (sh->vtag == 0) {
 480                                 sctp_inithdr_t _inithdr, *ih;
 481
 482                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 483                                                         sizeof(_inithdr), &_inithdr);
 484                                 if (ih == NULL)
 485                                         return 0;
 486
 487                                 DEBUGP("Setting vtag %x for new conn\n",
 488                                         ih->init_tag);
 489
 490                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 491                                                                 ih->init_tag;
 492                         } else {
 493                                 /* Sec 8.5.1 (A) */
 494                                 return 0;
 495                         }
 496                 }
 497                 /* If it is a shutdown ack OOTB packet, we expect a return
 498                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 499                 else {
 500                         DEBUGP("Setting vtag %x for new conn OOTB\n",
 501                                 sh->vtag);
 502                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 503                 }
 504
 505                 conntrack->proto.sctp.state = newconntrack;
 506         }
 507
 508         return 1;
 509 }
 510
 511 struct nf_conntrack_protocol nf_conntrack_protocol_sctp4 = {
 512         .l3proto         = PF_INET,
 513         .proto           = IPPROTO_SCTP,
 514         .name            = "sctp",
 515         .pkt_to_tuple    = sctp_pkt_to_tuple,
 516         .invert_tuple    = sctp_invert_tuple,
 517         .print_tuple     = sctp_print_tuple,
 518         .print_conntrack = sctp_print_conntrack,
 519         .packet          = sctp_packet,
 520         .new             = sctp_new,
 521         .destroy         = NULL,
 522         .me              = THIS_MODULE
 523 };
 524
 525 struct nf_conntrack_protocol nf_conntrack_protocol_sctp6 = {
 526         .l3proto         = PF_INET6,
 527         .proto           = IPPROTO_SCTP,
 528         .name            = "sctp",
 529         .pkt_to_tuple    = sctp_pkt_to_tuple,
 530         .invert_tuple    = sctp_invert_tuple,
 531         .print_tuple     = sctp_print_tuple,
 532         .print_conntrack = sctp_print_conntrack,
 533         .packet          = sctp_packet,
 534         .new             = sctp_new,
 535         .destroy         = NULL,
 536         .me              = THIS_MODULE
 537 };
 538
 539 #ifdef CONFIG_SYSCTL
 540 static ctl_table nf_ct_sysctl_table[] = {
 541         {
 542                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
 543                 .procname       = "nf_conntrack_sctp_timeout_closed",
 544                 .data           = &nf_ct_sctp_timeout_closed,
 545                 .maxlen         = sizeof(unsigned int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec_jiffies,
 548         },
 549         {
 550                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
 551                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 552                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 553                 .maxlen         = sizeof(unsigned int),
 554                 .mode           = 0644,
 555                 .proc_handler   = &proc_dointvec_jiffies,
 556         },
 557         {
 558                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
 559                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 560                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 561                 .maxlen         = sizeof(unsigned int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec_jiffies,
 564         },
 565         {
 566                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
 567                 .procname       = "nf_conntrack_sctp_timeout_established",
 568                 .data           = &nf_ct_sctp_timeout_established,
 569                 .maxlen         = sizeof(unsigned int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec_jiffies,
 572         },
 573         {
 574                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
 575                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 576                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 577                 .maxlen         = sizeof(unsigned int),
 578                 .mode           = 0644,
 579                 .proc_handler   = &proc_dointvec_jiffies,
 580         },
 581         {
 582                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
 583                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 584                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 585                 .maxlen         = sizeof(unsigned int),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec_jiffies,
 588         },
 589         {
 590                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
 591                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 592                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 593                 .maxlen         = sizeof(unsigned int),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec_jiffies,
 596         },
 597         { .ctl_name = 0 }
 598 };
 599
 600 static ctl_table nf_ct_netfilter_table[] = {
 601         {
 602                 .ctl_name       = NET_NETFILTER,
 603                 .procname       = "netfilter",
 604                 .mode           = 0555,
 605                 .child          = nf_ct_sysctl_table,
 606         },
 607         { .ctl_name = 0 }
 608 };
 609
 610 static ctl_table nf_ct_net_table[] = {
 611         {
 612                 .ctl_name       = CTL_NET,
 613                 .procname       = "net",
 614                 .mode           = 0555,
 615                 .child          = nf_ct_netfilter_table,
 616         },
 617         { .ctl_name = 0 }
 618 };
 619
 620 static struct ctl_table_header *nf_ct_sysctl_header;
 621 #endif
 622
 623 int __init nf_conntrack_proto_sctp_init(void)
 624 {
 625         int ret;
 626
 627         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp4);
 628         if (ret) {
 629                 printk("nf_conntrack_proto_sctp4: protocol register failed\n");
 630                 goto out;
 631         }
 632         ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp6);
 633         if (ret) {
 634                 printk("nf_conntrack_proto_sctp6: protocol register failed\n");
 635                 goto cleanup_sctp4;
 636         }
 637
 638 #ifdef CONFIG_SYSCTL
 639         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 640         if (nf_ct_sysctl_header == NULL) {
 641                 printk("nf_conntrack_proto_sctp: can't register to sysctl.\n");
 642                 goto cleanup;
 643         }
 644 #endif
 645
 646         return ret;
 647
 648 #ifdef CONFIG_SYSCTL
 649  cleanup:
 650         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 651 #endif
 652  cleanup_sctp4:
 653         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 654  out:
 655         DEBUGP("SCTP conntrack module loading %s\n",
 656                                         ret ? "failed": "succeeded");
 657         return ret;
 658 }
 659
 660 void __exit nf_conntrack_proto_sctp_fini(void)
 661 {
 662         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6);
 663         nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4);
 664 #ifdef CONFIG_SYSCTL
 665         unregister_sysctl_table(nf_ct_sysctl_header);
 666 #endif
 667         DEBUGP("SCTP conntrack module unloaded\n");
 668 }
 669
 670 module_init(nf_conntrack_proto_sctp_init);
 671 module_exit(nf_conntrack_proto_sctp_fini);
 672
 673 MODULE_LICENSE("GPL");
 674 MODULE_AUTHOR("Kiran Kumar Immidi");
 675 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");