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 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
  29    closely.  They're more complex. --RR
  30
  31    And so for me for SCTP :D -Kiran */
  32
  33 static const char *const sctp_conntrack_names[] = {
  34         "NONE",
  35         "CLOSED",
  36         "COOKIE_WAIT",
  37         "COOKIE_ECHOED",
  38         "ESTABLISHED",
  39         "SHUTDOWN_SENT",
  40         "SHUTDOWN_RECD",
  41         "SHUTDOWN_ACK_SENT",
  42 };
  43
  44 #define SECS  * HZ
  45 #define MINS  * 60 SECS
  46 #define HOURS * 60 MINS
  47 #define DAYS  * 24 HOURS
  48
  49 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
  50         [SCTP_CONNTRACK_CLOSED]                 = 10 SECS,
  51         [SCTP_CONNTRACK_COOKIE_WAIT]            = 3 SECS,
  52         [SCTP_CONNTRACK_COOKIE_ECHOED]          = 3 SECS,
  53         [SCTP_CONNTRACK_ESTABLISHED]            = 5 DAYS,
  54         [SCTP_CONNTRACK_SHUTDOWN_SENT]          = 300 SECS / 1000,
  55         [SCTP_CONNTRACK_SHUTDOWN_RECD]          = 300 SECS / 1000,
  56         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]      = 3 SECS,
  57 };
  58
  59 #define sNO SCTP_CONNTRACK_NONE
  60 #define sCL SCTP_CONNTRACK_CLOSED
  61 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
  62 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
  63 #define sES SCTP_CONNTRACK_ESTABLISHED
  64 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
  65 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
  66 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
  67 #define sIV SCTP_CONNTRACK_MAX
  68
  69 /*
  70         These are the descriptions of the states:
  71
  72 NOTE: These state names are tantalizingly similar to the states of an
  73 SCTP endpoint. But the interpretation of the states is a little different,
  74 considering that these are the states of the connection and not of an end
  75 point. Please note the subtleties. -Kiran
  76
  77 NONE              - Nothing so far.
  78 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
  79                     an INIT_ACK chunk in the reply direction.
  80 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
  81 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
  82 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
  83 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
  84 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
  85                     to that of the SHUTDOWN chunk.
  86 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
  87                     the SHUTDOWN chunk. Connection is closed.
  88 */
  89
  90 /* TODO
  91  - I have assumed that the first INIT is in the original direction.
  92  This messes things when an INIT comes in the reply direction in CLOSED
  93  state.
  94  - Check the error type in the reply dir before transitioning from
  95 cookie echoed to closed.
  96  - Sec 5.2.4 of RFC 2960
  97  - Multi Homing support.
  98 */
  99
 100 /* SCTP conntrack state transitions */
 101 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
 102         {
 103 /*      ORIGINAL        */
 104 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 105 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
 106 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 107 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 108 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
 109 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 110 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't have Stale cookie*/
 111 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
 112 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in orig dir */
 113 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 114         },
 115         {
 116 /*      REPLY   */
 117 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
 118 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
 119 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
 120 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
 121 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
 122 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
 123 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
 124 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in reply dir */
 125 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
 126 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
 127         }
 128 };
 129
 130 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
 131                               struct nf_conntrack_tuple *tuple)
 132 {
 133         const struct sctphdr *hp;
 134         struct sctphdr _hdr;
 135
 136         /* Actually only need first 8 bytes. */
 137         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
 138         if (hp == NULL)
 139                 return false;
 140
 141         tuple->src.u.sctp.port = hp->source;
 142         tuple->dst.u.sctp.port = hp->dest;
 143         return true;
 144 }
 145
 146 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
 147                               const struct nf_conntrack_tuple *orig)
 148 {
 149         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
 150         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
 151         return true;
 152 }
 153
 154 /* Print out the per-protocol part of the tuple. */
 155 static int sctp_print_tuple(struct seq_file *s,
 156                             const struct nf_conntrack_tuple *tuple)
 157 {
 158         return seq_printf(s, "sport=%hu dport=%hu ",
 159                           ntohs(tuple->src.u.sctp.port),
 160                           ntohs(tuple->dst.u.sctp.port));
 161 }
 162
 163 /* Print out the private part of the conntrack. */
 164 static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
 165 {
 166         enum sctp_conntrack state;
 167
 168         spin_lock_bh(&ct->lock);
 169         state = ct->proto.sctp.state;
 170         spin_unlock_bh(&ct->lock);
 171
 172         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
 173 }
 174
 175 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
 176 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
 177         (offset) < (skb)->len &&                                        \
 178         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
 179         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
 180
 181 /* Some validity checks to make sure the chunks are fine */
 182 static int do_basic_checks(struct nf_conn *ct,
 183                            const struct sk_buff *skb,
 184                            unsigned int dataoff,
 185                            unsigned long *map)
 186 {
 187         u_int32_t offset, count;
 188         sctp_chunkhdr_t _sch, *sch;
 189         int flag;
 190
 191         flag = 0;
 192
 193         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 194                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
 195
 196                 if (sch->type == SCTP_CID_INIT ||
 197                     sch->type == SCTP_CID_INIT_ACK ||
 198                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
 199                         flag = 1;
 200
 201                 /*
 202                  * Cookie Ack/Echo chunks not the first OR
 203                  * Init / Init Ack / Shutdown compl chunks not the only chunks
 204                  * OR zero-length.
 205                  */
 206                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
 207                       sch->type == SCTP_CID_COOKIE_ECHO ||
 208                       flag) &&
 209                      count != 0) || !sch->length) {
 210                         pr_debug("Basic checks failed\n");
 211                         return 1;
 212                 }
 213
 214                 if (map)
 215                         set_bit(sch->type, map);
 216         }
 217
 218         pr_debug("Basic checks passed\n");
 219         return count == 0;
 220 }
 221
 222 static int sctp_new_state(enum ip_conntrack_dir dir,
 223                           enum sctp_conntrack cur_state,
 224                           int chunk_type)
 225 {
 226         int i;
 227
 228         pr_debug("Chunk type: %d\n", chunk_type);
 229
 230         switch (chunk_type) {
 231         case SCTP_CID_INIT:
 232                 pr_debug("SCTP_CID_INIT\n");
 233                 i = 0;
 234                 break;
 235         case SCTP_CID_INIT_ACK:
 236                 pr_debug("SCTP_CID_INIT_ACK\n");
 237                 i = 1;
 238                 break;
 239         case SCTP_CID_ABORT:
 240                 pr_debug("SCTP_CID_ABORT\n");
 241                 i = 2;
 242                 break;
 243         case SCTP_CID_SHUTDOWN:
 244                 pr_debug("SCTP_CID_SHUTDOWN\n");
 245                 i = 3;
 246                 break;
 247         case SCTP_CID_SHUTDOWN_ACK:
 248                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
 249                 i = 4;
 250                 break;
 251         case SCTP_CID_ERROR:
 252                 pr_debug("SCTP_CID_ERROR\n");
 253                 i = 5;
 254                 break;
 255         case SCTP_CID_COOKIE_ECHO:
 256                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
 257                 i = 6;
 258                 break;
 259         case SCTP_CID_COOKIE_ACK:
 260                 pr_debug("SCTP_CID_COOKIE_ACK\n");
 261                 i = 7;
 262                 break;
 263         case SCTP_CID_SHUTDOWN_COMPLETE:
 264                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
 265                 i = 8;
 266                 break;
 267         default:
 268                 /* Other chunks like DATA, SACK, HEARTBEAT and
 269                 its ACK do not cause a change in state */
 270                 pr_debug("Unknown chunk type, Will stay in %s\n",
 271                          sctp_conntrack_names[cur_state]);
 272                 return cur_state;
 273         }
 274
 275         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
 276                  dir, sctp_conntrack_names[cur_state], chunk_type,
 277                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
 278
 279         return sctp_conntracks[dir][i][cur_state];
 280 }
 281
 282 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
 283 static int sctp_packet(struct nf_conn *ct,
 284                        const struct sk_buff *skb,
 285                        unsigned int dataoff,
 286                        enum ip_conntrack_info ctinfo,
 287                        u_int8_t pf,
 288                        unsigned int hooknum)
 289 {
 290         enum sctp_conntrack new_state, old_state;
 291         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
 292         const struct sctphdr *sh;
 293         struct sctphdr _sctph;
 294         const struct sctp_chunkhdr *sch;
 295         struct sctp_chunkhdr _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_NONE;
 318         spin_lock_bh(&ct->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, ct);
 370         }
 371         spin_unlock_bh(&ct->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_ASSURED, ct);
 381         }
 382
 383         return NF_ACCEPT;
 384
 385 out_unlock:
 386         spin_unlock_bh(&ct->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         const struct sctphdr *sh;
 397         struct sctphdr _sctph;
 398         const struct sctp_chunkhdr *sch;
 399         struct sctp_chunkhdr _sch;
 400         u_int32_t offset, count;
 401         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
 402
 403         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
 404         if (sh == NULL)
 405                 return false;
 406
 407         if (do_basic_checks(ct, skb, dataoff, map) != 0)
 408                 return false;
 409
 410         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
 411         if (test_bit(SCTP_CID_ABORT, map) ||
 412             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
 413             test_bit(SCTP_CID_COOKIE_ACK, map))
 414                 return false;
 415
 416         memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
 417         new_state = SCTP_CONNTRACK_MAX;
 418         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
 419                 /* Don't need lock here: this conntrack not in circulation yet */
 420                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
 421                                            SCTP_CONNTRACK_NONE, sch->type);
 422
 423                 /* Invalid: delete conntrack */
 424                 if (new_state == SCTP_CONNTRACK_NONE ||
 425                     new_state == SCTP_CONNTRACK_MAX) {
 426                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
 427                         return false;
 428                 }
 429
 430                 /* Copy the vtag into the state info */
 431                 if (sch->type == SCTP_CID_INIT) {
 432                         if (sh->vtag == 0) {
 433                                 sctp_inithdr_t _inithdr, *ih;
 434
 435                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
 436                                                         sizeof(_inithdr), &_inithdr);
 437                                 if (ih == NULL)
 438                                         return false;
 439
 440                                 pr_debug("Setting vtag %x for new conn\n",
 441                                          ih->init_tag);
 442
 443                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 444                                                                 ih->init_tag;
 445                         } else {
 446                                 /* Sec 8.5.1 (A) */
 447                                 return false;
 448                         }
 449                 }
 450                 /* If it is a shutdown ack OOTB packet, we expect a return
 451                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
 452                 else {
 453                         pr_debug("Setting vtag %x for new conn OOTB\n",
 454                                  sh->vtag);
 455                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
 456                 }
 457
 458                 ct->proto.sctp.state = new_state;
 459         }
 460
 461         return true;
 462 }
 463
 464 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 465
 466 #include <linux/netfilter/nfnetlink.h>
 467 #include <linux/netfilter/nfnetlink_conntrack.h>
 468
 469 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
 470                           struct nf_conn *ct)
 471 {
 472         struct nlattr *nest_parms;
 473
 474         spin_lock_bh(&ct->lock);
 475         nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
 476         if (!nest_parms)
 477                 goto nla_put_failure;
 478
 479         NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state);
 480
 481         NLA_PUT_BE32(skb,
 482                      CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
 483                      ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]);
 484
 485         NLA_PUT_BE32(skb,
 486                      CTA_PROTOINFO_SCTP_VTAG_REPLY,
 487                      ct->proto.sctp.vtag[IP_CT_DIR_REPLY]);
 488
 489         spin_unlock_bh(&ct->lock);
 490
 491         nla_nest_end(skb, nest_parms);
 492
 493         return 0;
 494
 495 nla_put_failure:
 496         spin_unlock_bh(&ct->lock);
 497         return -1;
 498 }
 499
 500 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
 501         [CTA_PROTOINFO_SCTP_STATE]          = { .type = NLA_U8 },
 502         [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]  = { .type = NLA_U32 },
 503         [CTA_PROTOINFO_SCTP_VTAG_REPLY]     = { .type = NLA_U32 },
 504 };
 505
 506 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
 507 {
 508         struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
 509         struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
 510         int err;
 511
 512         /* updates may not contain the internal protocol info, skip parsing */
 513         if (!attr)
 514                 return 0;
 515
 516         err = nla_parse_nested(tb,
 517                                CTA_PROTOINFO_SCTP_MAX,
 518                                attr,
 519                                sctp_nla_policy);
 520         if (err < 0)
 521                 return err;
 522
 523         if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
 524             !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
 525             !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
 526                 return -EINVAL;
 527
 528         spin_lock_bh(&ct->lock);
 529         ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
 530         ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
 531                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
 532         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
 533                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
 534         spin_unlock_bh(&ct->lock);
 535
 536         return 0;
 537 }
 538
 539 static int sctp_nlattr_size(void)
 540 {
 541         return nla_total_size(0)        /* CTA_PROTOINFO_SCTP */
 542                 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
 543 }
 544 #endif
 545
 546 #ifdef CONFIG_SYSCTL
 547 static unsigned int sctp_sysctl_table_users;
 548 static struct ctl_table_header *sctp_sysctl_header;
 549 static struct ctl_table sctp_sysctl_table[] = {
 550         {
 551                 .procname       = "nf_conntrack_sctp_timeout_closed",
 552                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
 553                 .maxlen         = sizeof(unsigned int),
 554                 .mode           = 0644,
 555                 .proc_handler   = proc_dointvec_jiffies,
 556         },
 557         {
 558                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
 559                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
 560                 .maxlen         = sizeof(unsigned int),
 561                 .mode           = 0644,
 562                 .proc_handler   = proc_dointvec_jiffies,
 563         },
 564         {
 565                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
 566                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
 567                 .maxlen         = sizeof(unsigned int),
 568                 .mode           = 0644,
 569                 .proc_handler   = proc_dointvec_jiffies,
 570         },
 571         {
 572                 .procname       = "nf_conntrack_sctp_timeout_established",
 573                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
 574                 .maxlen         = sizeof(unsigned int),
 575                 .mode           = 0644,
 576                 .proc_handler   = proc_dointvec_jiffies,
 577         },
 578         {
 579                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
 580                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
 581                 .maxlen         = sizeof(unsigned int),
 582                 .mode           = 0644,
 583                 .proc_handler   = proc_dointvec_jiffies,
 584         },
 585         {
 586                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
 587                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
 588                 .maxlen         = sizeof(unsigned int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec_jiffies,
 591         },
 592         {
 593                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
 594                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
 595                 .maxlen         = sizeof(unsigned int),
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dointvec_jiffies,
 598         },
 599         { }
 600 };
 601
 602 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 603 static struct ctl_table sctp_compat_sysctl_table[] = {
 604         {
 605                 .procname       = "ip_conntrack_sctp_timeout_closed",
 606                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
 607                 .maxlen         = sizeof(unsigned int),
 608                 .mode           = 0644,
 609                 .proc_handler   = proc_dointvec_jiffies,
 610         },
 611         {
 612                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
 613                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
 614                 .maxlen         = sizeof(unsigned int),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dointvec_jiffies,
 617         },
 618         {
 619                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
 620                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
 621                 .maxlen         = sizeof(unsigned int),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec_jiffies,
 624         },
 625         {
 626                 .procname       = "ip_conntrack_sctp_timeout_established",
 627                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
 628                 .maxlen         = sizeof(unsigned int),
 629                 .mode           = 0644,
 630                 .proc_handler   = proc_dointvec_jiffies,
 631         },
 632         {
 633                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
 634                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
 635                 .maxlen         = sizeof(unsigned int),
 636                 .mode           = 0644,
 637                 .proc_handler   = proc_dointvec_jiffies,
 638         },
 639         {
 640                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
 641                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
 642                 .maxlen         = sizeof(unsigned int),
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dointvec_jiffies,
 645         },
 646         {
 647                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
 648                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
 649                 .maxlen         = sizeof(unsigned int),
 650                 .mode           = 0644,
 651                 .proc_handler   = proc_dointvec_jiffies,
 652         },
 653         { }
 654 };
 655 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 656 #endif
 657
 658 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
 659         .l3proto                = PF_INET,
 660         .l4proto                = IPPROTO_SCTP,
 661         .name                   = "sctp",
 662         .pkt_to_tuple           = sctp_pkt_to_tuple,
 663         .invert_tuple           = sctp_invert_tuple,
 664         .print_tuple            = sctp_print_tuple,
 665         .print_conntrack        = sctp_print_conntrack,
 666         .packet                 = sctp_packet,
 667         .new                    = sctp_new,
 668         .me                     = THIS_MODULE,
 669 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 670         .to_nlattr              = sctp_to_nlattr,
 671         .nlattr_size            = sctp_nlattr_size,
 672         .from_nlattr            = nlattr_to_sctp,
 673         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 674         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
 675         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 676         .nla_policy             = nf_ct_port_nla_policy,
 677 #endif
 678 #ifdef CONFIG_SYSCTL
 679         .ctl_table_users        = &sctp_sysctl_table_users,
 680         .ctl_table_header       = &sctp_sysctl_header,
 681         .ctl_table              = sctp_sysctl_table,
 682 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 683         .ctl_compat_table       = sctp_compat_sysctl_table,
 684 #endif
 685 #endif
 686 };
 687
 688 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
 689         .l3proto                = PF_INET6,
 690         .l4proto                = IPPROTO_SCTP,
 691         .name                   = "sctp",
 692         .pkt_to_tuple           = sctp_pkt_to_tuple,
 693         .invert_tuple           = sctp_invert_tuple,
 694         .print_tuple            = sctp_print_tuple,
 695         .print_conntrack        = sctp_print_conntrack,
 696         .packet                 = sctp_packet,
 697         .new                    = sctp_new,
 698         .me                     = THIS_MODULE,
 699 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 700         .to_nlattr              = sctp_to_nlattr,
 701         .nlattr_size            = sctp_nlattr_size,
 702         .from_nlattr            = nlattr_to_sctp,
 703         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
 704         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
 705         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
 706         .nla_policy             = nf_ct_port_nla_policy,
 707 #endif
 708 #ifdef CONFIG_SYSCTL
 709         .ctl_table_users        = &sctp_sysctl_table_users,
 710         .ctl_table_header       = &sctp_sysctl_header,
 711         .ctl_table              = sctp_sysctl_table,
 712 #endif
 713 };
 714
 715 static int __init nf_conntrack_proto_sctp_init(void)
 716 {
 717         int ret;
 718
 719         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
 720         if (ret) {
 721                 pr_err("nf_conntrack_l4proto_sctp4: protocol register failed\n");
 722                 goto out;
 723         }
 724         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
 725         if (ret) {
 726                 pr_err("nf_conntrack_l4proto_sctp6: protocol register failed\n");
 727                 goto cleanup_sctp4;
 728         }
 729
 730         return ret;
 731
 732  cleanup_sctp4:
 733         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 734  out:
 735         return ret;
 736 }
 737
 738 static void __exit nf_conntrack_proto_sctp_fini(void)
 739 {
 740         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
 741         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
 742 }
 743
 744 module_init(nf_conntrack_proto_sctp_init);
 745 module_exit(nf_conntrack_proto_sctp_fini);
 746
 747 MODULE_LICENSE("GPL");
 748 MODULE_AUTHOR("Kiran Kumar Immidi");
 749 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
 750 MODULE_ALIAS("ip_conntrack_proto_sctp");