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 conntrack->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 nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
  53 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
  54 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
  55 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
  56 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
  57 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
  58 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
  59
  60 static unsigned int * sctp_timeouts[]
  61 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
  62     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
  63     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
  64     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
  65     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
  66     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
  67     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
  68     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
  69  };
  70
  71 #define sNO SCTP_CONNTRACK_NONE
  72 #define sCL SCTP_CONNTRACK_CLOSED
  73 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  74 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  75 #define sES SCTP_CONNTRACK_ESTABLISHED
  76 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  77 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  78 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  79 #define sIV SCTP_CONNTRACK_MAX
  80
  81 /*
  82         These are the descriptions of the states:
  83
  84 NOTE: These state names are tantalizingly similar to the states of an
  85 SCTP endpoint. But the interpretation of the states is a little different,
  86 considering that these are the states of the connection and not of an end
  87 point. Please note the subtleties. -Kiran
  88
  89 NONE              - Nothing so far.
  90 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  91                     an INIT_ACK chunk in the reply direction.
  92 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
  93 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
  94 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
  95 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
  96 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
  97                     to that of the SHUTDOWN chunk.
  98 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
  99                     the SHUTDOWN chunk. Connection is closed.
 100 */
 101
 102 /* TODO
 103  - I have assumed that the first INIT is in the original direction.
 104  This messes things when an INIT comes in the reply direction in CLOSED
 105  state.
 106  - Check the error type in the reply dir before transitioning from
 107 cookie echoed to closed.
 108  - Sec 5.2.4 of RFC 2960
 109  - Multi Homing support.
 110 */
 111
 112 /* SCTP conntrack state transitions */
 113 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 114         {
 115 /*      ORIGINAL        */
 116 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 117 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 118 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 119 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 120 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 121 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 122 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
 123 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 124 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
 125 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 126         },
 127         {
 128 /*      REPLY   */
 129 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 130 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 131 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 132 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 133 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 134 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 135 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 136 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
 137 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 138 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 139         }
 140 };
 141
 142 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
 143                              unsigned int dataoff,
 144                              struct nf_conntrack_tuple *tuple)
 145 {
 146         sctp_sctphdr_t _hdr, *hp;
 147
 148         /* Actually only need first 8 bytes. */
 149         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 150         if (hp == NULL)
 151                 return 0;
 152
 153         tuple->src.u.sctp.port = hp->source;
 154         tuple->dst.u.sctp.port = hp->dest;
 155         return 1;
 156 }
 157
 158 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 159                              const struct nf_conntrack_tuple *orig)
 160 {
 161         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 162         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 163         return 1;
 164 }
 165
 166 /* Print out the per-protocol part of the tuple. */
 167 static int sctp_print_tuple(struct seq_file *s,
 168                             const struct nf_conntrack_tuple *tuple)
 169 {
 170         return seq_printf(s, "sport=%hu dport=%hu ",
 171                           ntohs(tuple->src.u.sctp.port),
 172                           ntohs(tuple->dst.u.sctp.port));
 173 }
 174
 175 /* Print out the private part of the conntrack. */
 176 static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
 177 {
 178         enum sctp_conntrack state;
 179
 180         read_lock_bh(&sctp_lock);
 181         state = ct->proto.sctp.state;
 182         read_unlock_bh(&sctp_lock);
 183
 184         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 185 }
 186
 187 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 188 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
 189         (offset) < (skb)->len &&                                        \
 190         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
 191         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
 192
 193 /* Some validity checks to make sure the chunks are fine */
 194 static int do_basic_checks(struct nf_conn *ct,
 195                            const struct sk_buff *skb,
 196                            unsigned int dataoff,
 197                            unsigned long *map)
 198 {
 199         u_int32_t offset, count;
 200         sctp_chunkhdr_t _sch, *sch;
 201         int flag;
 202
 203         flag = 0;
 204
 205         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 206                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
 207
 208                 if (sch->type == SCTP_CID_INIT ||
 209                     sch->type == SCTP_CID_INIT_ACK ||
 210                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
 211                         flag = 1;
 212
 213                 /*
 214                  * Cookie Ack/Echo chunks not the first OR
 215                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 216                  * OR zero-length.
 217                  */
 218                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
 219                       sch->type == SCTP_CID_COOKIE_ECHO ||
 220                       flag) &&
 221                      count != 0) || !sch->length) {
 222                         pr_debug("Basic checks failed\n");
 223                         return 1;
 224                 }
 225
 226                 if (map)
 227                         set_bit(sch->type, map);
 228         }
 229
 230         pr_debug("Basic checks passed\n");
 231         return count == 0;
 232 }
 233
 234 static int sctp_new_state(enum ip_conntrack_dir dir,
 235                           enum sctp_conntrack cur_state,
 236                           int chunk_type)
 237 {
 238         int i;
 239
 240         pr_debug("Chunk type: %d\n", chunk_type);
 241
 242         switch (chunk_type) {
 243         case SCTP_CID_INIT:
 244                 pr_debug("SCTP_CID_INIT\n");
 245                 i = 0;
 246                 break;
 247         case SCTP_CID_INIT_ACK:
 248                 pr_debug("SCTP_CID_INIT_ACK\n");
 249                 i = 1;
 250                 break;
 251         case SCTP_CID_ABORT:
 252                 pr_debug("SCTP_CID_ABORT\n");
 253                 i = 2;
 254                 break;
 255         case SCTP_CID_SHUTDOWN:
 256                 pr_debug("SCTP_CID_SHUTDOWN\n");
 257                 i = 3;
 258                 break;
 259         case SCTP_CID_SHUTDOWN_ACK:
 260                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 261                 i = 4;
 262                 break;
 263         case SCTP_CID_ERROR:
 264                 pr_debug("SCTP_CID_ERROR\n");
 265                 i = 5;
 266                 break;
 267         case SCTP_CID_COOKIE_ECHO:
 268                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
 269                 i = 6;
 270                 break;
 271         case SCTP_CID_COOKIE_ACK:
 272                 pr_debug("SCTP_CID_COOKIE_ACK\n");
 273                 i = 7;
 274                 break;
 275         case SCTP_CID_SHUTDOWN_COMPLETE:
 276                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 277                 i = 8;
 278                 break;
 279         default:
 280                 /* Other chunks like DATA, SACK, HEARTBEAT and
 281                 its ACK do not cause a change in state */
 282                 pr_debug("Unknown chunk type, Will stay in %s\n",
 283                          sctp_conntrack_names[cur_state]);
 284                 return cur_state;
 285         }
 286
 287         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 288                  dir, sctp_conntrack_names[cur_state], chunk_type,
 289                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 290
 291         return sctp_conntracks[dir][i][cur_state];
 292 }
 293
 294 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
 295 static int sctp_packet(struct nf_conn *ct,
 296                        const struct sk_buff *skb,
 297                        unsigned int dataoff,
 298                        enum ip_conntrack_info ctinfo,
 299                        int pf,
 300                        unsigned int hooknum)
 301 {
 302         enum sctp_conntrack new_state, old_state;
 303         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
 304         sctp_sctphdr_t _sctph, *sh;
 305         sctp_chunkhdr_t _sch, *sch;
 306         u_int32_t offset, count;
 307         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 308
 309         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 310         if (sh == NULL)
 311                 goto out;
 312
 313         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 314                 goto out;
 315
 316         /* Check the verification tag (Sec 8.5) */
 317         if (!test_bit(SCTP_CID_INIT, map) &&
 318             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
 319             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
 320             !test_bit(SCTP_CID_ABORT, map) &&
 321             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
 322             sh->vtag != ct->proto.sctp.vtag[dir]) {
 323                 pr_debug("Verification tag check failed\n");
 324                 goto out;
 325         }
 326
 327         old_state = new_state = SCTP_CONNTRACK_MAX;
 328         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 329                 write_lock_bh(&sctp_lock);
 330
 331                 /* Special cases of Verification tag check (Sec 8.5.1) */
 332                 if (sch->type == SCTP_CID_INIT) {
 333                         /* Sec 8.5.1 (A) */
 334                         if (sh->vtag != 0)
 335                                 goto out_unlock;
 336                 } else if (sch->type == SCTP_CID_ABORT) {
 337                         /* Sec 8.5.1 (B) */
 338                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 339                             sh->vtag != ct->proto.sctp.vtag[!dir])
 340                                 goto out_unlock;
 341                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 342                         /* Sec 8.5.1 (C) */
 343                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 344                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
 345                             (sch->flags & 1))
 346                                 goto out_unlock;
 347                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 348                         /* Sec 8.5.1 (D) */
 349                         if (sh->vtag != ct->proto.sctp.vtag[dir])
 350                                 goto out_unlock;
 351                 }
 352
 353                 old_state = ct->proto.sctp.state;
 354                 new_state = sctp_new_state(dir, old_state, sch->type);
 355
 356                 /* Invalid */
 357                 if (new_state == SCTP_CONNTRACK_MAX) {
 358                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 359                                  "conntrack=%u\n",
 360                                  dir, sch->type, old_state);
 361                         goto out_unlock;
 362                 }
 363
 364                 /* If it is an INIT or an INIT ACK note down the vtag */
 365                 if (sch->type == SCTP_CID_INIT ||
 366                     sch->type == SCTP_CID_INIT_ACK) {
 367                         sctp_inithdr_t _inithdr, *ih;
 368
 369                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 370                                                 sizeof(_inithdr), &_inithdr);
 371                         if (ih == NULL)
 372                                 goto out_unlock;
 373                         pr_debug("Setting vtag %x for dir %d\n",
 374                                  ih->init_tag, !dir);
 375                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
 376                 }
 377
 378                 ct->proto.sctp.state = new_state;
 379                 if (old_state != new_state)
 380                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 381                 write_unlock_bh(&sctp_lock);
 382         }
 383
 384         nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[new_state]);
 385
 386         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
 387             dir == IP_CT_DIR_REPLY &&
 388             new_state == SCTP_CONNTRACK_ESTABLISHED) {
 389                 pr_debug("Setting assured bit\n");
 390                 set_bit(IPS_ASSURED_BIT, &ct->status);
 391                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 392         }
 393
 394         return NF_ACCEPT;
 395
 396 out_unlock:
 397         write_unlock_bh(&sctp_lock);
 398 out:
 399         return -NF_ACCEPT;
 400 }
 401
 402 /* Called when a new connection for this protocol found. */
 403 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
 404                     unsigned int dataoff)
 405 {
 406         enum sctp_conntrack new_state;
 407         sctp_sctphdr_t _sctph, *sh;
 408         sctp_chunkhdr_t _sch, *sch;
 409         u_int32_t offset, count;
 410         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 411
 412         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 413         if (sh == NULL)
 414                 return 0;
 415
 416         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 417                 return 0;
 418
 419         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 420         if (test_bit(SCTP_CID_ABORT, map) ||
 421             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 422             test_bit(SCTP_CID_COOKIE_ACK, map))
 423                 return 0;
 424
 425         new_state = SCTP_CONNTRACK_MAX;
 426         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 427                 /* Don't need lock here: this conntrack not in circulation yet */
 428                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
 429                                            SCTP_CONNTRACK_NONE, sch->type);
 430
 431                 /* Invalid: delete conntrack */
 432                 if (new_state == SCTP_CONNTRACK_NONE ||
 433                     new_state == SCTP_CONNTRACK_MAX) {
 434                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 435                         return 0;
 436                 }
 437
 438                 /* Copy the vtag into the state info */
 439                 if (sch->type == SCTP_CID_INIT) {
 440                         if (sh->vtag == 0) {
 441                                 sctp_inithdr_t _inithdr, *ih;
 442
 443                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 444                                                         sizeof(_inithdr), &_inithdr);
 445                                 if (ih == NULL)
 446                                         return 0;
 447
 448                                 pr_debug("Setting vtag %x for new conn\n",
 449                                          ih->init_tag);
 450
 451                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 452                                                                 ih->init_tag;
 453                         } else {
 454                                 /* Sec 8.5.1 (A) */
 455                                 return 0;
 456                         }
 457                 }
 458                 /* If it is a shutdown ack OOTB packet, we expect a return
 459                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 460                 else {
 461                         pr_debug("Setting vtag %x for new conn OOTB\n",
 462                                  sh->vtag);
 463                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 464                 }
 465
 466                 ct->proto.sctp.state = new_state;
 467         }
 468
 469         return 1;
 470 }
 471
 472 #ifdef CONFIG_SYSCTL
 473 static unsigned int sctp_sysctl_table_users;
 474 static struct ctl_table_header *sctp_sysctl_header;
 475 static struct ctl_table sctp_sysctl_table[] = {
 476         {
 477                 .procname       = "nf_conntrack_sctp_timeout_closed",
 478                 .data           = &nf_ct_sctp_timeout_closed,
 479                 .maxlen         = sizeof(unsigned int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dointvec_jiffies,
 482         },
 483         {
 484                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 485                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 486                 .maxlen         = sizeof(unsigned int),
 487                 .mode           = 0644,
 488                 .proc_handler   = &proc_dointvec_jiffies,
 489         },
 490         {
 491                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 492                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 493                 .maxlen         = sizeof(unsigned int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec_jiffies,
 496         },
 497         {
 498                 .procname       = "nf_conntrack_sctp_timeout_established",
 499                 .data           = &nf_ct_sctp_timeout_established,
 500                 .maxlen         = sizeof(unsigned int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dointvec_jiffies,
 503         },
 504         {
 505                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 506                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 507                 .maxlen         = sizeof(unsigned int),
 508                 .mode           = 0644,
 509                 .proc_handler   = &proc_dointvec_jiffies,
 510         },
 511         {
 512                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 513                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 514                 .maxlen         = sizeof(unsigned int),
 515                 .mode           = 0644,
 516                 .proc_handler   = &proc_dointvec_jiffies,
 517         },
 518         {
 519                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 520                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 521                 .maxlen         = sizeof(unsigned int),
 522                 .mode           = 0644,
 523                 .proc_handler   = &proc_dointvec_jiffies,
 524         },
 525         {
 526                 .ctl_name = 0
 527         }
 528 };
 529
 530 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 531 static struct ctl_table sctp_compat_sysctl_table[] = {
 532         {
 533                 .procname       = "ip_conntrack_sctp_timeout_closed",
 534                 .data           = &nf_ct_sctp_timeout_closed,
 535                 .maxlen         = sizeof(unsigned int),
 536                 .mode           = 0644,
 537                 .proc_handler   = &proc_dointvec_jiffies,
 538         },
 539         {
 540                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 541                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 542                 .maxlen         = sizeof(unsigned int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec_jiffies,
 545         },
 546         {
 547                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 548                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 549                 .maxlen         = sizeof(unsigned int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec_jiffies,
 552         },
 553         {
 554                 .procname       = "ip_conntrack_sctp_timeout_established",
 555                 .data           = &nf_ct_sctp_timeout_established,
 556                 .maxlen         = sizeof(unsigned int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec_jiffies,
 559         },
 560         {
 561                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 562                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 563                 .maxlen         = sizeof(unsigned int),
 564                 .mode           = 0644,
 565                 .proc_handler   = &proc_dointvec_jiffies,
 566         },
 567         {
 568                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 569                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 570                 .maxlen         = sizeof(unsigned int),
 571                 .mode           = 0644,
 572                 .proc_handler   = &proc_dointvec_jiffies,
 573         },
 574         {
 575                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 576                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 577                 .maxlen         = sizeof(unsigned int),
 578                 .mode           = 0644,
 579                 .proc_handler   = &proc_dointvec_jiffies,
 580         },
 581         {
 582                 .ctl_name = 0
 583         }
 584 };
 585 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 586 #endif
 587
 588 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 589         .l3proto                = PF_INET,
 590         .l4proto                = IPPROTO_SCTP,
 591         .name                   = "sctp",
 592         .pkt_to_tuple           = sctp_pkt_to_tuple,
 593         .invert_tuple           = sctp_invert_tuple,
 594         .print_tuple            = sctp_print_tuple,
 595         .print_conntrack        = sctp_print_conntrack,
 596         .packet                 = sctp_packet,
 597         .new                    = sctp_new,
 598         .me                     = THIS_MODULE,
 599 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 600         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 601         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 602         .nla_policy             = nf_ct_port_nla_policy,
 603 #endif
 604 #ifdef CONFIG_SYSCTL
 605         .ctl_table_users        = &sctp_sysctl_table_users,
 606         .ctl_table_header       = &sctp_sysctl_header,
 607         .ctl_table              = sctp_sysctl_table,
 608 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 609         .ctl_compat_table       = sctp_compat_sysctl_table,
 610 #endif
 611 #endif
 612 };
 613
 614 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 615         .l3proto                = PF_INET6,
 616         .l4proto                = IPPROTO_SCTP,
 617         .name                   = "sctp",
 618         .pkt_to_tuple           = sctp_pkt_to_tuple,
 619         .invert_tuple           = sctp_invert_tuple,
 620         .print_tuple            = sctp_print_tuple,
 621         .print_conntrack        = sctp_print_conntrack,
 622         .packet                 = sctp_packet,
 623         .new                    = sctp_new,
 624         .me                     = THIS_MODULE,
 625 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 626         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 627         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 628         .nla_policy             = nf_ct_port_nla_policy,
 629 #endif
 630 #ifdef CONFIG_SYSCTL
 631         .ctl_table_users        = &sctp_sysctl_table_users,
 632         .ctl_table_header       = &sctp_sysctl_header,
 633         .ctl_table              = sctp_sysctl_table,
 634 #endif
 635 };
 636
 637 int __init nf_conntrack_proto_sctp_init(void)
 638 {
 639         int ret;
 640
 641         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 642         if (ret) {
 643                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 644                 goto out;
 645         }
 646         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 647         if (ret) {
 648                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 649                 goto cleanup_sctp4;
 650         }
 651
 652         return ret;
 653
 654  cleanup_sctp4:
 655         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 656  out:
 657         return ret;
 658 }
 659
 660 void __exit nf_conntrack_proto_sctp_fini(void)
 661 {
 662         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 663         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 664 }
 665
 666 module_init(nf_conntrack_proto_sctp_init);
 667 module_exit(nf_conntrack_proto_sctp_fini);
 668
 669 MODULE_LICENSE("GPL");
 670 MODULE_AUTHOR("Kiran Kumar Immidi");
 671 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 672 MODULE_ALIAS("ip_conntrack_proto_sctp");