git.oblomov.eu Git - linux-2.6/blob - net/netfilter/nf_conntrack_proto_sctp.c

   1 /*
   2  * Connection tracking protocol helper module for SCTP.
   3  *
   4  * SCTP is defined in RFC 2960. References to various sections in this code
   5  * are to this RFC.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  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         write_lock_bh(&sctp_lock);
 329         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 330                 /* Special cases of Verification tag check (Sec 8.5.1) */
 331                 if (sch->type == SCTP_CID_INIT) {
 332                         /* Sec 8.5.1 (A) */
 333                         if (sh->vtag != 0)
 334                                 goto out_unlock;
 335                 } else if (sch->type == SCTP_CID_ABORT) {
 336                         /* Sec 8.5.1 (B) */
 337                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 338                             sh->vtag != ct->proto.sctp.vtag[!dir])
 339                                 goto out_unlock;
 340                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
 341                         /* Sec 8.5.1 (C) */
 342                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
 343                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
 344                             (sch->flags & 1))
 345                                 goto out_unlock;
 346                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
 347                         /* Sec 8.5.1 (D) */
 348                         if (sh->vtag != ct->proto.sctp.vtag[dir])
 349                                 goto out_unlock;
 350                 }
 351
 352                 old_state = ct->proto.sctp.state;
 353                 new_state = sctp_new_state(dir, old_state, sch->type);
 354
 355                 /* Invalid */
 356                 if (new_state == SCTP_CONNTRACK_MAX) {
 357                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
 358                                  "conntrack=%u\n",
 359                                  dir, sch->type, old_state);
 360                         goto out_unlock;
 361                 }
 362
 363                 /* If it is an INIT or an INIT ACK note down the vtag */
 364                 if (sch->type == SCTP_CID_INIT ||
 365                     sch->type == SCTP_CID_INIT_ACK) {
 366                         sctp_inithdr_t _inithdr, *ih;
 367
 368                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 369                                                 sizeof(_inithdr), &_inithdr);
 370                         if (ih == NULL)
 371                                 goto out_unlock;
 372                         pr_debug("Setting vtag %x for dir %d\n",
 373                                  ih->init_tag, !dir);
 374                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
 375                 }
 376
 377                 ct->proto.sctp.state = new_state;
 378                 if (old_state != new_state)
 379                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
 380         }
 381         write_unlock_bh(&sctp_lock);
 382
 383         nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[new_state]);
 384
 385         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
 386             dir == IP_CT_DIR_REPLY &&
 387             new_state == SCTP_CONNTRACK_ESTABLISHED) {
 388                 pr_debug("Setting assured bit\n");
 389                 set_bit(IPS_ASSURED_BIT, &ct->status);
 390                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 391         }
 392
 393         return NF_ACCEPT;
 394
 395 out_unlock:
 396         write_unlock_bh(&sctp_lock);
 397 out:
 398         return -NF_ACCEPT;
 399 }
 400
 401 /* Called when a new connection for this protocol found. */
 402 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
 403                     unsigned int dataoff)
 404 {
 405         enum sctp_conntrack new_state;
 406         sctp_sctphdr_t _sctph, *sh;
 407         sctp_chunkhdr_t _sch, *sch;
 408         u_int32_t offset, count;
 409         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 410
 411         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 412         if (sh == NULL)
 413                 return 0;
 414
 415         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 416                 return 0;
 417
 418         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 419         if (test_bit(SCTP_CID_ABORT, map) ||
 420             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 421             test_bit(SCTP_CID_COOKIE_ACK, map))
 422                 return 0;
 423
 424         new_state = SCTP_CONNTRACK_MAX;
 425         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 426                 /* Don't need lock here: this conntrack not in circulation yet */
 427                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
 428                                            SCTP_CONNTRACK_NONE, sch->type);
 429
 430                 /* Invalid: delete conntrack */
 431                 if (new_state == SCTP_CONNTRACK_NONE ||
 432                     new_state == SCTP_CONNTRACK_MAX) {
 433                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 434                         return 0;
 435                 }
 436
 437                 /* Copy the vtag into the state info */
 438                 if (sch->type == SCTP_CID_INIT) {
 439                         if (sh->vtag == 0) {
 440                                 sctp_inithdr_t _inithdr, *ih;
 441
 442                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 443                                                         sizeof(_inithdr), &_inithdr);
 444                                 if (ih == NULL)
 445                                         return 0;
 446
 447                                 pr_debug("Setting vtag %x for new conn\n",
 448                                          ih->init_tag);
 449
 450                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 451                                                                 ih->init_tag;
 452                         } else {
 453                                 /* Sec 8.5.1 (A) */
 454                                 return 0;
 455                         }
 456                 }
 457                 /* If it is a shutdown ack OOTB packet, we expect a return
 458                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 459                 else {
 460                         pr_debug("Setting vtag %x for new conn OOTB\n",
 461                                  sh->vtag);
 462                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 463                 }
 464
 465                 ct->proto.sctp.state = new_state;
 466         }
 467
 468         return 1;
 469 }
 470
 471 #ifdef CONFIG_SYSCTL
 472 static unsigned int sctp_sysctl_table_users;
 473 static struct ctl_table_header *sctp_sysctl_header;
 474 static struct ctl_table sctp_sysctl_table[] = {
 475         {
 476                 .procname       = "nf_conntrack_sctp_timeout_closed",
 477                 .data           = &nf_ct_sctp_timeout_closed,
 478                 .maxlen         = sizeof(unsigned int),
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dointvec_jiffies,
 481         },
 482         {
 483                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 484                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 485                 .maxlen         = sizeof(unsigned int),
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dointvec_jiffies,
 488         },
 489         {
 490                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 491                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 492                 .maxlen         = sizeof(unsigned int),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dointvec_jiffies,
 495         },
 496         {
 497                 .procname       = "nf_conntrack_sctp_timeout_established",
 498                 .data           = &nf_ct_sctp_timeout_established,
 499                 .maxlen         = sizeof(unsigned int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &proc_dointvec_jiffies,
 502         },
 503         {
 504                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 505                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 506                 .maxlen         = sizeof(unsigned int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec_jiffies,
 509         },
 510         {
 511                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 512                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 513                 .maxlen         = sizeof(unsigned int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec_jiffies,
 516         },
 517         {
 518                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 519                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 520                 .maxlen         = sizeof(unsigned int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec_jiffies,
 523         },
 524         {
 525                 .ctl_name = 0
 526         }
 527 };
 528
 529 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 530 static struct ctl_table sctp_compat_sysctl_table[] = {
 531         {
 532                 .procname       = "ip_conntrack_sctp_timeout_closed",
 533                 .data           = &nf_ct_sctp_timeout_closed,
 534                 .maxlen         = sizeof(unsigned int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec_jiffies,
 537         },
 538         {
 539                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 540                 .data           = &nf_ct_sctp_timeout_cookie_wait,
 541                 .maxlen         = sizeof(unsigned int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec_jiffies,
 544         },
 545         {
 546                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 547                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
 548                 .maxlen         = sizeof(unsigned int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec_jiffies,
 551         },
 552         {
 553                 .procname       = "ip_conntrack_sctp_timeout_established",
 554                 .data           = &nf_ct_sctp_timeout_established,
 555                 .maxlen         = sizeof(unsigned int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec_jiffies,
 558         },
 559         {
 560                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 561                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
 562                 .maxlen         = sizeof(unsigned int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec_jiffies,
 565         },
 566         {
 567                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 568                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
 569                 .maxlen         = sizeof(unsigned int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec_jiffies,
 572         },
 573         {
 574                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 575                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
 576                 .maxlen         = sizeof(unsigned int),
 577                 .mode           = 0644,
 578                 .proc_handler   = &proc_dointvec_jiffies,
 579         },
 580         {
 581                 .ctl_name = 0
 582         }
 583 };
 584 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 585 #endif
 586
 587 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 588         .l3proto                = PF_INET,
 589         .l4proto                = IPPROTO_SCTP,
 590         .name                   = "sctp",
 591         .pkt_to_tuple           = sctp_pkt_to_tuple,
 592         .invert_tuple           = sctp_invert_tuple,
 593         .print_tuple            = sctp_print_tuple,
 594         .print_conntrack        = sctp_print_conntrack,
 595         .packet                 = sctp_packet,
 596         .new                    = sctp_new,
 597         .me                     = THIS_MODULE,
 598 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 599         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 600         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 601         .nla_policy             = nf_ct_port_nla_policy,
 602 #endif
 603 #ifdef CONFIG_SYSCTL
 604         .ctl_table_users        = &sctp_sysctl_table_users,
 605         .ctl_table_header       = &sctp_sysctl_header,
 606         .ctl_table              = sctp_sysctl_table,
 607 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 608         .ctl_compat_table       = sctp_compat_sysctl_table,
 609 #endif
 610 #endif
 611 };
 612
 613 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 614         .l3proto                = PF_INET6,
 615         .l4proto                = IPPROTO_SCTP,
 616         .name                   = "sctp",
 617         .pkt_to_tuple           = sctp_pkt_to_tuple,
 618         .invert_tuple           = sctp_invert_tuple,
 619         .print_tuple            = sctp_print_tuple,
 620         .print_conntrack        = sctp_print_conntrack,
 621         .packet                 = sctp_packet,
 622         .new                    = sctp_new,
 623         .me                     = THIS_MODULE,
 624 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 625         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 626         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 627         .nla_policy             = nf_ct_port_nla_policy,
 628 #endif
 629 #ifdef CONFIG_SYSCTL
 630         .ctl_table_users        = &sctp_sysctl_table_users,
 631         .ctl_table_header       = &sctp_sysctl_header,
 632         .ctl_table              = sctp_sysctl_table,
 633 #endif
 634 };
 635
 636 int __init nf_conntrack_proto_sctp_init(void)
 637 {
 638         int ret;
 639
 640         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 641         if (ret) {
 642                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 643                 goto out;
 644         }
 645         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 646         if (ret) {
 647                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 648                 goto cleanup_sctp4;
 649         }
 650
 651         return ret;
 652
 653  cleanup_sctp4:
 654         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 655  out:
 656         return ret;
 657 }
 658
 659 void __exit nf_conntrack_proto_sctp_fini(void)
 660 {
 661         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 662         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 663 }
 664
 665 module_init(nf_conntrack_proto_sctp_init);
 666 module_exit(nf_conntrack_proto_sctp_fini);
 667
 668 MODULE_LICENSE("GPL");
 669 MODULE_AUTHOR("Kiran Kumar Immidi");
 670 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 671 MODULE_ALIAS("ip_conntrack_proto_sctp");