net/netfilter/nf_conntrack_proto_sctp.c

   1 /*
   2  * Connection tracking protocol helper module for SCTP.
   3  *
   4  * SCTP is defined in RFC 2960. References to various sections in this code
   5  * are to this RFC.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/timer.h>
  14 #include <linux/netfilter.h>
  15 #include <linux/module.h>
  16 #include <linux/in.h>
  17 #include <linux/ip.h>
  18 #include <linux/sctp.h>
  19 #include <linux/string.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <net/netfilter/nf_conntrack.h>
  25 #include <net/netfilter/nf_conntrack_l4proto.h>
  26 #include <net/netfilter/nf_conntrack_ecache.h>
  27
  28 /* Protects ct->proto.sctp */
  29 static DEFINE_RWLOCK(sctp_lock);
  30
  31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  32    closely.  They're more complex. --RR
  33
  34    And so for me for SCTP :D -Kiran */
  35
  36 static const char *sctp_conntrack_names[] = {
  37         "NONE",
  38         "CLOSED",
  39         "COOKIE_WAIT",
  40         "COOKIE_ECHOED",
  41         "ESTABLISHED",
  42         "SHUTDOWN_SENT",
  43         "SHUTDOWN_RECD",
  44         "SHUTDOWN_ACK_SENT",
  45 };
  46
  47 #define SECS  * HZ
  48 #define MINS  * 60 SECS
  49 #define HOURS * 60 MINS
  50 #define DAYS  * 24 HOURS
  51
  52 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
  53         [SCTP_CONNTRACK_CLOSED]                 = 10 SECS,
  54         [SCTP_CONNTRACK_COOKIE_WAIT]            = 3 SECS,
  55         [SCTP_CONNTRACK_COOKIE_ECHOED]          = 3 SECS,
  56         [SCTP_CONNTRACK_ESTABLISHED]            = 5 DAYS,
  57         [SCTP_CONNTRACK_SHUTDOWN_SENT]          = 300 SECS / 1000,
  58         [SCTP_CONNTRACK_SHUTDOWN_RECD]          = 300 SECS / 1000,
  59         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]      = 3 SECS,
  60 };
  61
  62 #define sNO SCTP_CONNTRACK_NONE
  63 #define sCL SCTP_CONNTRACK_CLOSED
  64 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  65 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  66 #define sES SCTP_CONNTRACK_ESTABLISHED
  67 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  68 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  69 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  70 #define sIV SCTP_CONNTRACK_MAX
  71
  72 /*
  73         These are the descriptions of the states:
  74
  75 NOTE: These state names are tantalizingly similar to the states of an
  76 SCTP endpoint. But the interpretation of the states is a little different,
  77 considering that these are the states of the connection and not of an end
  78 point. Please note the subtleties. -Kiran
  79
  80 NONE              - Nothing so far.
  81 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  82                     an INIT_ACK chunk in the reply direction.
  83 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
  84 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
  85 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
  86 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
  87 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
  88                     to that of the SHUTDOWN chunk.
  89 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
  90                     the SHUTDOWN chunk. Connection is closed.
  91 */
  92
  93 /* TODO
  94  - I have assumed that the first INIT is in the original direction.
  95  This messes things when an INIT comes in the reply direction in CLOSED
  96  state.
  97  - Check the error type in the reply dir before transitioning from
  98 cookie echoed to closed.
  99  - Sec 5.2.4 of RFC 2960
 100  - Multi Homing support.
 101 */
 102
 103 /* SCTP conntrack state transitions */
 104 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 105         {
 106 /*      ORIGINAL        */
 107 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 108 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 109 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 110 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 111 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 112 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 113 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 114 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 115 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 116 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 117         },
 118         {
 119 /*      REPLY   */
 120 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 121 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 122 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 123 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 124 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 125 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 126 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 127 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 128 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 129 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 130         }
 131 };
 132
 133 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
 134                               struct nf_conntrack_tuple *tuple)
 135 {
 136         sctp_sctphdr_t _hdr, *hp;
 137
 138         /* Actually only need first 8 bytes. */
 139         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 140         if (hp == NULL)
 141                 return false;
 142
 143         tuple->src.u.sctp.port = hp->source;
 144         tuple->dst.u.sctp.port = hp->dest;
 145         return true;
 146 }
 147
 148 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 149                               const struct nf_conntrack_tuple *orig)
 150 {
 151         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 152         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 153         return true;
 154 }
 155
 156 /* Print out the per-protocol part of the tuple. */
 157 static int sctp_print_tuple(struct seq_file *s,
 158                             const struct nf_conntrack_tuple *tuple)
 159 {
 160         return seq_printf(s, "sport=%hu dport=%hu ",
 161                           ntohs(tuple->src.u.sctp.port),
 162                           ntohs(tuple->dst.u.sctp.port));
 163 }
 164
 165 /* Print out the private part of the conntrack. */
 166 static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
 167 {
 168         enum sctp_conntrack state;
 169
 170         read_lock_bh(&sctp_lock);
 171         state = ct->proto.sctp.state;
 172         read_unlock_bh(&sctp_lock);
 173
 174         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 175 }
 176
 177 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 178 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
 179         (offset) < (skb)->len &&                                        \
 180         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
 181         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
 182
 183 /* Some validity checks to make sure the chunks are fine */
 184 static int do_basic_checks(struct nf_conn *ct,
 185                            const struct sk_buff *skb,
 186                            unsigned int dataoff,
 187                            unsigned long *map)
 188 {
 189         u_int32_t offset, count;
 190         sctp_chunkhdr_t _sch, *sch;
 191         int flag;
 192
 193         flag = 0;
 194
 195         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 196                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
 197
 198                 if (sch->type == SCTP_CID_INIT ||
 199                     sch->type == SCTP_CID_INIT_ACK ||
 200                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
 201                         flag = 1;
 202
 203                 /*
 204                  * Cookie Ack/Echo chunks not the first OR
 205                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 206                  * OR zero-length.
 207                  */
 208                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
 209                       sch->type == SCTP_CID_COOKIE_ECHO ||
 210                       flag) &&
 211                      count != 0) || !sch->length) {
 212                         pr_debug("Basic checks failed\n");
 213                         return 1;
 214                 }
 215
 216                 if (map)
 217                         set_bit(sch->type, map);
 218         }
 219
 220         pr_debug("Basic checks passed\n");
 221         return count == 0;
 222 }
 223
 224 static int sctp_new_state(enum ip_conntrack_dir dir,
 225                           enum sctp_conntrack cur_state,
 226                           int chunk_type)
 227 {
 228         int i;
 229
 230         pr_debug("Chunk type: %d\n", chunk_type);
 231
 232         switch (chunk_type) {
 233         case SCTP_CID_INIT:
 234                 pr_debug("SCTP_CID_INIT\n");
 235                 i = 0;
 236                 break;
 237         case SCTP_CID_INIT_ACK:
 238                 pr_debug("SCTP_CID_INIT_ACK\n");
 239                 i = 1;
 240                 break;
 241         case SCTP_CID_ABORT:
 242                 pr_debug("SCTP_CID_ABORT\n");
 243                 i = 2;
 244                 break;
 245         case SCTP_CID_SHUTDOWN:
 246                 pr_debug("SCTP_CID_SHUTDOWN\n");
 247                 i = 3;
 248                 break;
 249         case SCTP_CID_SHUTDOWN_ACK:
 250                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 251                 i = 4;
 252                 break;
 253         case SCTP_CID_ERROR:
 254                 pr_debug("SCTP_CID_ERROR\n");
 255                 i = 5;
 256                 break;
 257         case SCTP_CID_COOKIE_ECHO:
 258                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
 259                 i = 6;
 260                 break;
 261         case SCTP_CID_COOKIE_ACK:
 262                 pr_debug("SCTP_CID_COOKIE_ACK\n");
 263                 i = 7;
 264                 break;
 265         case SCTP_CID_SHUTDOWN_COMPLETE:
 266                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 267                 i = 8;
 268                 break;
 269         default:
 270                 /* Other chunks like DATA, SACK, HEARTBEAT and
 271                 its ACK do not cause a change in state */
 272                 pr_debug("Unknown chunk type, Will stay in %s\n",
 273                          sctp_conntrack_names[cur_state]);
 274                 return cur_state;
 275         }
 276
 277         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 278                  dir, sctp_conntrack_names[cur_state], chunk_type,
 279                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 280
 281         return sctp_conntracks[dir][i][cur_state];
 282 }
 283
 284 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
 285 static int sctp_packet(struct nf_conn *ct,
 286                        const struct sk_buff *skb,
 287                        unsigned int dataoff,
 288                        enum ip_conntrack_info ctinfo,
 289                        int pf,
 290                        unsigned int hooknum)
 291 {
 292         enum sctp_conntrack new_state, old_state;
 293         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
 294         sctp_sctphdr_t _sctph, *sh;
 295         sctp_chunkhdr_t _sch, *sch;
 296         u_int32_t offset, count;
 297         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 298
 299         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 300         if (sh == NULL)
 301                 goto out;
 302
 303         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 304                 goto out;
 305
 306         /* Check the verification tag (Sec 8.5) */
 307         if (!test_bit(SCTP_CID_INIT, map) &&
 308             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
 309             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
 310             !test_bit(SCTP_CID_ABORT, map) &&
 311             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
 312             sh->vtag != ct->proto.sctp.vtag[dir]) {
 313                 pr_debug("Verification tag check failed\n");
 314                 goto out;
 315         }
 316
 317         old_state = new_state = SCTP_CONNTRACK_MAX;
 318         write_lock_bh(&sctp_lock);
 319         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 320                 /* Special cases of Verification tag check (Sec 8.5.1) */
 321                 if (sch->type == SCTP_CID_INIT) {
 322                         /* Sec 8.5.1 (A) */
 323                         if (sh->vtag != 0)
 324                                 goto out_unlock;
 325                 } else if (sch->type == SCTP_CID_ABORT) {
 326                         /* Sec 8.5.1 (B) */
 327                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 328                             sh->vtag != ct->proto.sctp.vtag[!dir])
 329                                 goto out_unlock;
 330                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 331                         /* Sec 8.5.1 (C) */
 332                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 333                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
 334                             sch->flags & SCTP_CHUNK_FLAG_T)
 335                                 goto out_unlock;
 336                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 337                         /* Sec 8.5.1 (D) */
 338                         if (sh->vtag != ct->proto.sctp.vtag[dir])
 339                                 goto out_unlock;
 340                 }
 341
 342                 old_state = ct->proto.sctp.state;
 343                 new_state = sctp_new_state(dir, old_state, sch->type);
 344
 345                 /* Invalid */
 346                 if (new_state == SCTP_CONNTRACK_MAX) {
 347                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 348                                  "conntrack=%u\n",
 349                                  dir, sch->type, old_state);
 350                         goto out_unlock;
 351                 }
 352
 353                 /* If it is an INIT or an INIT ACK note down the vtag */
 354                 if (sch->type == SCTP_CID_INIT ||
 355                     sch->type == SCTP_CID_INIT_ACK) {
 356                         sctp_inithdr_t _inithdr, *ih;
 357
 358                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 359                                                 sizeof(_inithdr), &_inithdr);
 360                         if (ih == NULL)
 361                                 goto out_unlock;
 362                         pr_debug("Setting vtag %x for dir %d\n",
 363                                  ih->init_tag, !dir);
 364                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
 365                 }
 366
 367                 ct->proto.sctp.state = new_state;
 368                 if (old_state != new_state)
 369                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 370         }
 371         write_unlock_bh(&sctp_lock);
 372
 373         nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]);
 374
 375         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
 376             dir == IP_CT_DIR_REPLY &&
 377             new_state == SCTP_CONNTRACK_ESTABLISHED) {
 378                 pr_debug("Setting assured bit\n");
 379                 set_bit(IPS_ASSURED_BIT, &ct->status);
 380                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 381         }
 382
 383         return NF_ACCEPT;
 384
 385 out_unlock:
 386         write_unlock_bh(&sctp_lock);
 387 out:
 388         return -NF_ACCEPT;
 389 }
 390
 391 /* Called when a new connection for this protocol found. */
 392 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
 393                      unsigned int dataoff)
 394 {
 395         enum sctp_conntrack new_state;
 396         sctp_sctphdr_t _sctph, *sh;
 397         sctp_chunkhdr_t _sch, *sch;
 398         u_int32_t offset, count;
 399         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 400
 401         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 402         if (sh == NULL)
 403                 return false;
 404
 405         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 406                 return false;
 407
 408         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 409         if (test_bit(SCTP_CID_ABORT, map) ||
 410             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 411             test_bit(SCTP_CID_COOKIE_ACK, map))
 412                 return false;
 413
 414         new_state = SCTP_CONNTRACK_MAX;
 415         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 416                 /* Don't need lock here: this conntrack not in circulation yet */
 417                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
 418                                            SCTP_CONNTRACK_NONE, sch->type);
 419
 420                 /* Invalid: delete conntrack */
 421                 if (new_state == SCTP_CONNTRACK_NONE ||
 422                     new_state == SCTP_CONNTRACK_MAX) {
 423                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 424                         return false;
 425                 }
 426
 427                 /* Copy the vtag into the state info */
 428                 if (sch->type == SCTP_CID_INIT) {
 429                         if (sh->vtag == 0) {
 430                                 sctp_inithdr_t _inithdr, *ih;
 431
 432                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 433                                                         sizeof(_inithdr), &_inithdr);
 434                                 if (ih == NULL)
 435                                         return false;
 436
 437                                 pr_debug("Setting vtag %x for new conn\n",
 438                                          ih->init_tag);
 439
 440                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 441                                                                 ih->init_tag;
 442                         } else {
 443                                 /* Sec 8.5.1 (A) */
 444                                 return false;
 445                         }
 446                 }
 447                 /* If it is a shutdown ack OOTB packet, we expect a return
 448                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 449                 else {
 450                         pr_debug("Setting vtag %x for new conn OOTB\n",
 451                                  sh->vtag);
 452                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 453                 }
 454
 455                 ct->proto.sctp.state = new_state;
 456         }
 457
 458         return true;
 459 }
 460
 461 #ifdef CONFIG_SYSCTL
 462 static unsigned int sctp_sysctl_table_users;
 463 static struct ctl_table_header *sctp_sysctl_header;
 464 static struct ctl_table sctp_sysctl_table[] = {
 465         {
 466                 .procname       = "nf_conntrack_sctp_timeout_closed",
 467                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
 468                 .maxlen         = sizeof(unsigned int),
 469                 .mode           = 0644,
 470                 .proc_handler   = &proc_dointvec_jiffies,
 471         },
 472         {
 473                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 474                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
 475                 .maxlen         = sizeof(unsigned int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec_jiffies,
 478         },
 479         {
 480                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 481                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
 482                 .maxlen         = sizeof(unsigned int),
 483                 .mode           = 0644,
 484                 .proc_handler   = &proc_dointvec_jiffies,
 485         },
 486         {
 487                 .procname       = "nf_conntrack_sctp_timeout_established",
 488                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
 489                 .maxlen         = sizeof(unsigned int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec_jiffies,
 492         },
 493         {
 494                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 495                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
 496                 .maxlen         = sizeof(unsigned int),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dointvec_jiffies,
 499         },
 500         {
 501                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 502                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
 503                 .maxlen         = sizeof(unsigned int),
 504                 .mode           = 0644,
 505                 .proc_handler   = &proc_dointvec_jiffies,
 506         },
 507         {
 508                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 509                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
 510                 .maxlen         = sizeof(unsigned int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_dointvec_jiffies,
 513         },
 514         {
 515                 .ctl_name = 0
 516         }
 517 };
 518
 519 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 520 static struct ctl_table sctp_compat_sysctl_table[] = {
 521         {
 522                 .procname       = "ip_conntrack_sctp_timeout_closed",
 523                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
 524                 .maxlen         = sizeof(unsigned int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_dointvec_jiffies,
 527         },
 528         {
 529                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 530                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
 531                 .maxlen         = sizeof(unsigned int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec_jiffies,
 534         },
 535         {
 536                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 537                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
 538                 .maxlen         = sizeof(unsigned int),
 539                 .mode           = 0644,
 540                 .proc_handler   = &proc_dointvec_jiffies,
 541         },
 542         {
 543                 .procname       = "ip_conntrack_sctp_timeout_established",
 544                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
 545                 .maxlen         = sizeof(unsigned int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec_jiffies,
 548         },
 549         {
 550                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 551                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
 552                 .maxlen         = sizeof(unsigned int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec_jiffies,
 555         },
 556         {
 557                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 558                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
 559                 .maxlen         = sizeof(unsigned int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_jiffies,
 562         },
 563         {
 564                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 565                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
 566                 .maxlen         = sizeof(unsigned int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec_jiffies,
 569         },
 570         {
 571                 .ctl_name = 0
 572         }
 573 };
 574 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 575 #endif
 576
 577 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 578         .l3proto                = PF_INET,
 579         .l4proto                = IPPROTO_SCTP,
 580         .name                   = "sctp",
 581         .pkt_to_tuple           = sctp_pkt_to_tuple,
 582         .invert_tuple           = sctp_invert_tuple,
 583         .print_tuple            = sctp_print_tuple,
 584         .print_conntrack        = sctp_print_conntrack,
 585         .packet                 = sctp_packet,
 586         .new                    = sctp_new,
 587         .me                     = THIS_MODULE,
 588 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 589         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 590         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 591         .nla_policy             = nf_ct_port_nla_policy,
 592 #endif
 593 #ifdef CONFIG_SYSCTL
 594         .ctl_table_users        = &sctp_sysctl_table_users,
 595         .ctl_table_header       = &sctp_sysctl_header,
 596         .ctl_table              = sctp_sysctl_table,
 597 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 598         .ctl_compat_table       = sctp_compat_sysctl_table,
 599 #endif
 600 #endif
 601 };
 602
 603 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 604         .l3proto                = PF_INET6,
 605         .l4proto                = IPPROTO_SCTP,
 606         .name                   = "sctp",
 607         .pkt_to_tuple           = sctp_pkt_to_tuple,
 608         .invert_tuple           = sctp_invert_tuple,
 609         .print_tuple            = sctp_print_tuple,
 610         .print_conntrack        = sctp_print_conntrack,
 611         .packet                 = sctp_packet,
 612         .new                    = sctp_new,
 613         .me                     = THIS_MODULE,
 614 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 615         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 616         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 617         .nla_policy             = nf_ct_port_nla_policy,
 618 #endif
 619 #ifdef CONFIG_SYSCTL
 620         .ctl_table_users        = &sctp_sysctl_table_users,
 621         .ctl_table_header       = &sctp_sysctl_header,
 622         .ctl_table              = sctp_sysctl_table,
 623 #endif
 624 };
 625
 626 static int __init nf_conntrack_proto_sctp_init(void)
 627 {
 628         int ret;
 629
 630         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 631         if (ret) {
 632                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 633                 goto out;
 634         }
 635         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 636         if (ret) {
 637                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 638                 goto cleanup_sctp4;
 639         }
 640
 641         return ret;
 642
 643  cleanup_sctp4:
 644         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 645  out:
 646         return ret;
 647 }
 648
 649 static void __exit nf_conntrack_proto_sctp_fini(void)
 650 {
 651         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 652         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 653 }
 654
 655 module_init(nf_conntrack_proto_sctp_init);
 656 module_exit(nf_conntrack_proto_sctp_fini);
 657
 658 MODULE_LICENSE("GPL");
 659 MODULE_AUTHOR("Kiran Kumar Immidi");
 660 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 661 MODULE_ALIAS("ip_conntrack_proto_sctp");