src/vnet/sctp/sctp_input.c

   1 /*
   2  * Copyright (c) 2017 SUSE LLC.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #include <vppinfra/sparse_vec.h>
  16 #include <vnet/sctp/sctp.h>
  17 #include <vnet/sctp/sctp_packet.h>
  18 #include <vnet/sctp/sctp_debug.h>
  19 #include <vnet/session/session.h>
  20 #include <math.h>
  21
  22 static char *sctp_error_strings[] = {
  23 #define sctp_error(n,s) s,
  24 #include <vnet/sctp/sctp_error.def>
  25 #undef sctp_error
  26 };
  27
  28 /* All SCTP nodes have the same outgoing arcs */
  29 #define foreach_sctp_state_next                  \
  30   _ (DROP4, "ip4-drop")                         \
  31   _ (DROP6, "ip6-drop")                         \
  32   _ (SCTP4_OUTPUT, "sctp4-output")                \
  33   _ (SCTP6_OUTPUT, "sctp6-output")
  34
  35 typedef enum _sctp_established_phase_next
  36 {
  37 #define _(s,n) SCTP_ESTABLISHED_PHASE_NEXT_##s,
  38   foreach_sctp_state_next
  39 #undef _
  40     SCTP_ESTABLISHED_PHASE_N_NEXT,
  41 } sctp_established_phase_next_t;
  42
  43 typedef enum _sctp_rcv_phase_next
  44 {
  45 #define _(s,n) SCTP_RCV_PHASE_NEXT_##s,
  46   foreach_sctp_state_next
  47 #undef _
  48     SCTP_RCV_PHASE_N_NEXT,
  49 } sctp_rcv_phase_next_t;
  50
  51 typedef enum _sctp_listen_phase_next
  52 {
  53 #define _(s,n) SCTP_LISTEN_PHASE_NEXT_##s,
  54   foreach_sctp_state_next
  55 #undef _
  56     SCTP_LISTEN_PHASE_N_NEXT,
  57 } sctp_listen_phase_next_t;
  58
  59 typedef enum _sctp_shutdown_phase_next
  60 {
  61 #define _(s,n) SCTP_SHUTDOWN_PHASE_NEXT_##s,
  62   foreach_sctp_state_next
  63 #undef _
  64     SCTP_SHUTDOWN_PHASE_N_NEXT,
  65 } sctp_shutdown_phase_next_t;
  66
  67 /* Generic, state independent indices */
  68 typedef enum _sctp_state_next
  69 {
  70 #define _(s,n) SCTP_NEXT_##s,
  71   foreach_sctp_state_next
  72 #undef _
  73     SCTP_STATE_N_NEXT,
  74 } sctp_state_next_t;
  75
  76 typedef enum _sctp_input_next
  77 {
  78   SCTP_INPUT_NEXT_DROP,
  79   SCTP_INPUT_NEXT_LISTEN_PHASE,
  80   SCTP_INPUT_NEXT_RCV_PHASE,
  81   SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
  82   SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
  83   SCTP_INPUT_NEXT_PUNT_PHASE,
  84   SCTP_INPUT_N_NEXT
  85 } sctp_input_next_t;
  86
  87 char *
  88 phase_to_string (u8 phase)
  89 {
  90   switch (phase)
  91     {
  92     case SCTP_INPUT_NEXT_DROP:
  93       return "SCTP_INPUT_NEXT_DROP";
  94     case SCTP_INPUT_NEXT_LISTEN_PHASE:
  95       return "SCTP_INPUT_NEXT_LISTEN_PHASE";
  96     case SCTP_INPUT_NEXT_RCV_PHASE:
  97       return "SCTP_INPUT_NEXT_RCV_PHASE";
  98     case SCTP_INPUT_NEXT_ESTABLISHED_PHASE:
  99       return "SCTP_INPUT_NEXT_ESTABLISHED_PHASE";
 100     case SCTP_INPUT_NEXT_SHUTDOWN_PHASE:
 101       return "SCTP_INPUT_NEXT_SHUTDOWN_PHASE";
 102     case SCTP_INPUT_NEXT_PUNT_PHASE:
 103       return "SCTP_INPUT_NEXT_PUNT_PHASE";
 104     }
 105   return NULL;
 106 }
 107
 108 #define foreach_sctp4_input_next                 \
 109   _ (DROP, "error-drop")                         \
 110   _ (RCV_PHASE, "sctp4-rcv")                    \
 111   _ (LISTEN_PHASE, "sctp4-listen")       \
 112   _ (ESTABLISHED_PHASE, "sctp4-established")             \
 113   _ (SHUTDOWN_PHASE, "sctp4-shutdown")  \
 114   _ (PUNT_PHASE, "ip4-punt")
 115
 116
 117 #define foreach_sctp6_input_next                 \
 118   _ (DROP, "error-drop")                         \
 119   _ (RCV_PHASE, "sctp6-rcv")                    \
 120   _ (LISTEN_PHASE, "sctp6-listen")       \
 121   _ (ESTABLISHED_PHASE, "sctp6-established")             \
 122   _ (SHUTDOWN_PHASE, "sctp6-shutdown")          \
 123   _ (PUNT_PHASE, "ip6-punt")
 124
 125 static u8
 126 sctp_lookup_is_valid (transport_connection_t * trans_conn,
 127                       sctp_header_t * sctp_hdr)
 128 {
 129   sctp_connection_t *sctp_conn =
 130     sctp_get_connection_from_transport (trans_conn);
 131
 132   if (!sctp_conn)
 133     return 1;
 134
 135   u8 is_valid = (trans_conn->lcl_port == sctp_hdr->dst_port
 136                  && (sctp_conn->state == SCTP_STATE_CLOSED
 137                      || trans_conn->rmt_port == sctp_hdr->src_port));
 138
 139   return is_valid;
 140 }
 141
 142 /**
 143  * Lookup transport connection
 144  */
 145 static sctp_connection_t *
 146 sctp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
 147                         u8 is_ip4)
 148 {
 149   sctp_main_t *tm = vnet_get_sctp_main ();
 150   sctp_header_t *sctp_hdr;
 151   transport_connection_t *trans_conn;
 152   sctp_connection_t *sctp_conn;
 153   u8 is_filtered, i;
 154   if (is_ip4)
 155     {
 156       ip4_header_t *ip4_hdr;
 157       ip4_hdr = vlib_buffer_get_current (b);
 158       sctp_hdr = ip4_next_header (ip4_hdr);
 159       trans_conn = session_lookup_connection_wt4 (fib_index,
 160                                                   &ip4_hdr->dst_address,
 161                                                   &ip4_hdr->src_address,
 162                                                   sctp_hdr->dst_port,
 163                                                   sctp_hdr->src_port,
 164                                                   TRANSPORT_PROTO_SCTP,
 165                                                   thread_index, &is_filtered);
 166       if (trans_conn == 0)      /* Not primary connection */
 167         {
 168           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 169             {
 170               if ((tm->connections[thread_index]->sub_conn[i].
 171                    connection.lcl_ip.ip4.as_u32 ==
 172                    ip4_hdr->dst_address.as_u32)
 173                   && (tm->connections[thread_index]->sub_conn[i].
 174                       connection.rmt_ip.ip4.as_u32 ==
 175                       ip4_hdr->src_address.as_u32))
 176                 {
 177                   trans_conn =
 178                     &tm->connections[thread_index]->sub_conn[i].connection;
 179                   break;
 180                 }
 181             }
 182         }
 183       ASSERT (trans_conn != 0);
 184       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 185     }
 186   else
 187     {
 188       ip6_header_t *ip6_hdr;
 189       ip6_hdr = vlib_buffer_get_current (b);
 190       sctp_hdr = ip6_next_header (ip6_hdr);
 191       trans_conn = session_lookup_connection_wt6 (fib_index,
 192                                                   &ip6_hdr->dst_address,
 193                                                   &ip6_hdr->src_address,
 194                                                   sctp_hdr->dst_port,
 195                                                   sctp_hdr->src_port,
 196                                                   TRANSPORT_PROTO_SCTP,
 197                                                   thread_index, &is_filtered);
 198       if (trans_conn == 0)      /* Not primary connection */
 199         {
 200           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 201             {
 202               if ((tm->connections[thread_index]->sub_conn[i].
 203                    connection.lcl_ip.ip6.as_u64[0] ==
 204                    ip6_hdr->dst_address.as_u64[0]
 205                    && tm->connections[thread_index]->sub_conn[i].
 206                    connection.lcl_ip.ip6.as_u64[1] ==
 207                    ip6_hdr->dst_address.as_u64[1])
 208                   && (tm->connections[thread_index]->sub_conn[i].
 209                       connection.rmt_ip.ip6.as_u64[0] ==
 210                       ip6_hdr->src_address.as_u64[0]
 211                       && tm->connections[thread_index]->
 212                       sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
 213                       ip6_hdr->src_address.as_u64[1]))
 214                 {
 215                   trans_conn =
 216                     &tm->connections[thread_index]->sub_conn[i].connection;
 217                   break;
 218                 }
 219             }
 220         }
 221       ASSERT (trans_conn != 0);
 222       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 223     }
 224   sctp_conn = sctp_get_connection_from_transport (trans_conn);
 225   return sctp_conn;
 226 }
 227
 228 typedef struct
 229 {
 230   sctp_header_t sctp_header;
 231   sctp_connection_t sctp_connection;
 232 } sctp_rx_trace_t;
 233
 234 #define sctp_next_output(is_ip4) (is_ip4 ? SCTP_NEXT_SCTP4_OUTPUT          \
 235                                         : SCTP_NEXT_SCTP6_OUTPUT)
 236
 237 #define sctp_next_drop(is_ip4) (is_ip4 ? SCTP_NEXT_DROP4                  \
 238                                       : SCTP_NEXT_DROP6)
 239
 240 void
 241 sctp_set_rx_trace_data (sctp_rx_trace_t * rx_trace,
 242                         sctp_connection_t * sctp_conn,
 243                         sctp_header_t * sctp_hdr, vlib_buffer_t * b0,
 244                         u8 is_ip4)
 245 {
 246   if (sctp_conn)
 247     {
 248       clib_memcpy (&rx_trace->sctp_connection, sctp_conn,
 249                    sizeof (rx_trace->sctp_connection));
 250     }
 251   else
 252     {
 253       sctp_hdr = sctp_buffer_hdr (b0);
 254     }
 255   clib_memcpy (&rx_trace->sctp_header, sctp_hdr,
 256                sizeof (rx_trace->sctp_header));
 257 }
 258
 259 always_inline u16
 260 sctp_calculate_implied_length (ip4_header_t * ip4_hdr, ip6_header_t * ip6_hdr,
 261                                int is_ip4)
 262 {
 263   u16 sctp_implied_packet_length = 0;
 264
 265   if (is_ip4)
 266     sctp_implied_packet_length =
 267       clib_net_to_host_u16 (ip4_hdr->length) - ip4_header_bytes (ip4_hdr);
 268   else
 269     sctp_implied_packet_length =
 270       clib_net_to_host_u16 (ip6_hdr->payload_length) - sizeof (ip6_hdr);
 271
 272   return sctp_implied_packet_length;
 273 }
 274
 275 always_inline u8
 276 sctp_is_bundling (u16 sctp_implied_length,
 277                   sctp_chunks_common_hdr_t * sctp_common_hdr)
 278 {
 279   if (sctp_implied_length !=
 280       sizeof (sctp_header_t) + vnet_sctp_get_chunk_length (sctp_common_hdr))
 281     return 1;
 282   return 0;
 283 }
 284
 285 always_inline u16
 286 sctp_handle_operation_err (sctp_header_t * sctp_hdr,
 287                            sctp_connection_t * sctp_conn, u8 idx,
 288                            vlib_buffer_t * b, u16 * next0)
 289 {
 290   sctp_operation_error_t *op_err = (sctp_operation_error_t *) sctp_hdr;
 291
 292   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 293   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 294     {
 295       return SCTP_ERROR_INVALID_TAG;
 296     }
 297
 298   if (clib_net_to_host_u16 (op_err->err_causes[0].param_hdr.type) ==
 299       STALE_COOKIE_ERROR)
 300     {
 301       if (sctp_conn->state != SCTP_STATE_COOKIE_ECHOED)
 302         *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 303       else
 304         {
 305           sctp_connection_cleanup (sctp_conn);
 306
 307           stream_session_disconnect_notify (&sctp_conn->
 308                                             sub_conn[idx].connection);
 309         }
 310     }
 311
 312   return SCTP_ERROR_NONE;
 313 }
 314
 315 always_inline u16
 316 sctp_handle_init (sctp_header_t * sctp_hdr,
 317                   sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 318                   sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 319                   u16 sctp_implied_length)
 320 {
 321   sctp_init_chunk_t *init_chunk = (sctp_init_chunk_t *) (sctp_hdr);
 322   ip4_address_t ip4_addr;
 323   ip6_address_t ip6_addr;
 324   u8 add_ip4 = 0;
 325   u8 add_ip6 = 0;
 326   char hostname[FQDN_MAX_LENGTH];
 327
 328   /* Check the current state of the connection
 329    *
 330    * The logic required by the RFC4960 Section 5.2.2 is already taken care of
 331    * in the code below and by the "sctp_prepare_initack_chunk" function.
 332    * However, for debugging purposes it is nice to have a message printed out
 333    * for these corner-case scenarios.
 334    */
 335   if (sctp_conn->state != SCTP_STATE_CLOSED)
 336     {                           /* UNEXPECTED scenario */
 337       switch (sctp_conn->state)
 338         {
 339         case SCTP_STATE_COOKIE_WAIT:
 340           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_WAIT state");
 341           sctp_prepare_initack_chunk_for_collision (sctp_conn,
 342                                                     SCTP_PRIMARY_PATH_IDX,
 343                                                     b0, &ip4_addr, &ip6_addr);
 344           return SCTP_ERROR_NONE;
 345         case SCTP_STATE_COOKIE_ECHOED:
 346         case SCTP_STATE_SHUTDOWN_ACK_SENT:
 347           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_ECHOED state");
 348           if (sctp_conn->forming_association_changed == 0)
 349             sctp_prepare_initack_chunk_for_collision (sctp_conn,
 350                                                       SCTP_PRIMARY_PATH_IDX,
 351                                                       b0, &ip4_addr,
 352                                                       &ip6_addr);
 353           else
 354             sctp_prepare_abort_for_collision (sctp_conn,
 355                                               SCTP_PRIMARY_PATH_IDX, b0,
 356                                               &ip4_addr, &ip6_addr);
 357           return SCTP_ERROR_NONE;
 358         }
 359     }
 360
 361   if (sctp_hdr->verification_tag != 0x0)
 362     return SCTP_ERROR_INVALID_TAG_FOR_INIT;
 363
 364   /*
 365    * It is not possible to bundle any other CHUNK with the INIT chunk
 366    */
 367   if (sctp_is_bundling (sctp_implied_length, &init_chunk->chunk_hdr))
 368     return SCTP_ERROR_BUNDLING_VIOLATION;
 369
 370   /* Save the INITIATE_TAG of the remote peer for this connection:
 371    * it MUST be used for the VERIFICATION_TAG parameter in the SCTP HEADER */
 372   sctp_conn->remote_tag = init_chunk->initiate_tag;
 373   sctp_conn->remote_initial_tsn =
 374     clib_net_to_host_u32 (init_chunk->initial_tsn);
 375   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 376   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 377   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 378                           sctp_conn->remote_initial_tsn);
 379
 380   sctp_conn->peer_rwnd = clib_net_to_host_u32 (init_chunk->a_rwnd);
 381   /*
 382    * If the length specified in the INIT message is bigger than the size in bytes of our structure it means that
 383    * optional parameters have been sent with the INIT chunk and we need to parse them.
 384    */
 385   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 386   if (length > sizeof (sctp_init_chunk_t))
 387     {
 388       /* There are optional parameters in the INIT chunk */
 389       u16 pointer_offset = sizeof (sctp_init_chunk_t);
 390       while (pointer_offset < length)
 391         {
 392           sctp_opt_params_hdr_t *opt_params_hdr =
 393             (sctp_opt_params_hdr_t *) init_chunk + pointer_offset;
 394
 395           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 396             {
 397             case SCTP_IPV4_ADDRESS_TYPE:
 398               {
 399                 sctp_ipv4_addr_param_t *ipv4 =
 400                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 401                 clib_memcpy (&ip4_addr, &ipv4->address,
 402                              sizeof (ip4_address_t));
 403
 404                 if (sctp_sub_connection_add_ip4 (vlib_get_main (),
 405                                                  &sctp_conn->sub_conn
 406                                                  [SCTP_PRIMARY_PATH_IDX].connection.
 407                                                  lcl_ip.ip4,
 408                                                  &ipv4->address) ==
 409                     SCTP_ERROR_NONE)
 410                   add_ip4 = 1;
 411
 412                 break;
 413               }
 414             case SCTP_IPV6_ADDRESS_TYPE:
 415               {
 416                 sctp_ipv6_addr_param_t *ipv6 =
 417                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 418                 clib_memcpy (&ip6_addr, &ipv6->address,
 419                              sizeof (ip6_address_t));
 420
 421                 if (sctp_sub_connection_add_ip6 (vlib_get_main (),
 422                                                  &sctp_conn->sub_conn
 423                                                  [SCTP_PRIMARY_PATH_IDX].connection.
 424                                                  lcl_ip.ip6,
 425                                                  &ipv6->address) ==
 426                     SCTP_ERROR_NONE)
 427                   add_ip6 = 1;
 428
 429                 break;
 430               }
 431             case SCTP_COOKIE_PRESERVATIVE_TYPE:
 432               {
 433                 sctp_cookie_preservative_param_t *cookie_pres =
 434                   (sctp_cookie_preservative_param_t *) opt_params_hdr;
 435                 sctp_conn->peer_cookie_life_span_increment =
 436                   cookie_pres->life_span_inc;
 437                 break;
 438               }
 439             case SCTP_HOSTNAME_ADDRESS_TYPE:
 440               {
 441                 sctp_hostname_param_t *hostname_addr =
 442                   (sctp_hostname_param_t *) opt_params_hdr;
 443                 clib_memcpy (hostname, hostname_addr->hostname,
 444                              FQDN_MAX_LENGTH);
 445                 break;
 446               }
 447             case SCTP_SUPPORTED_ADDRESS_TYPES:
 448               {
 449                 /* TODO */
 450                 break;
 451               }
 452             }
 453           pointer_offset += clib_net_to_host_u16 (opt_params_hdr->length);
 454         }
 455     }
 456
 457   /* Reuse buffer to make init-ack and send */
 458   sctp_prepare_initack_chunk (sctp_conn, SCTP_PRIMARY_PATH_IDX, b0, &ip4_addr,
 459                               add_ip4, &ip6_addr, add_ip6);
 460   return SCTP_ERROR_NONE;
 461 }
 462
 463 always_inline u16
 464 sctp_is_valid_init_ack (sctp_header_t * sctp_hdr,
 465                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 466                         sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 467                         u16 sctp_implied_length)
 468 {
 469   sctp_init_ack_chunk_t *init_ack_chunk =
 470     (sctp_init_ack_chunk_t *) (sctp_hdr);
 471
 472   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 473   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 474     {
 475       return SCTP_ERROR_INVALID_TAG;
 476     }
 477
 478   /*
 479    * It is not possible to bundle any other CHUNK with the INIT_ACK chunk
 480    */
 481   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 482     return SCTP_ERROR_BUNDLING_VIOLATION;
 483
 484   return SCTP_ERROR_NONE;
 485 }
 486
 487 always_inline u16
 488 sctp_handle_init_ack (sctp_header_t * sctp_hdr,
 489                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 490                       sctp_connection_t * sctp_conn, u8 idx,
 491                       vlib_buffer_t * b0, u16 sctp_implied_length)
 492 {
 493   sctp_init_ack_chunk_t *init_ack_chunk =
 494     (sctp_init_ack_chunk_t *) (sctp_hdr);
 495
 496   char hostname[FQDN_MAX_LENGTH];
 497
 498   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 499   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 500     {
 501       return SCTP_ERROR_INVALID_TAG;
 502     }
 503
 504   /*
 505    * It is not possible to bundle any other CHUNK with the INIT chunk
 506    */
 507   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 508     return SCTP_ERROR_BUNDLING_VIOLATION;
 509
 510   /* Stop the T1_INIT timer */
 511   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_INIT);
 512
 513   sctp_calculate_rto (sctp_conn, idx);
 514
 515   /* remote_tag to be placed in the VERIFICATION_TAG field of the COOKIE_ECHO chunk */
 516   sctp_conn->remote_tag = init_ack_chunk->initiate_tag;
 517   sctp_conn->remote_initial_tsn =
 518     clib_net_to_host_u32 (init_ack_chunk->initial_tsn);
 519   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 520   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 521   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 522                           sctp_conn->remote_initial_tsn);
 523   sctp_conn->peer_rwnd = clib_net_to_host_u32 (init_ack_chunk->a_rwnd);
 524
 525   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 526
 527   if (length > sizeof (sctp_init_ack_chunk_t))
 528     /*
 529      * There are optional parameters in the INIT ACK chunk
 530      */
 531     {
 532       u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
 533
 534       while (pointer_offset < length)
 535         {
 536           sctp_opt_params_hdr_t *opt_params_hdr =
 537             (sctp_opt_params_hdr_t *) ((char *) init_ack_chunk +
 538                                        pointer_offset);
 539
 540           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 541             {
 542             case SCTP_IPV4_ADDRESS_TYPE:
 543               {
 544                 sctp_ipv4_addr_param_t *ipv4 =
 545                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 546
 547                 sctp_sub_connection_add_ip4 (vlib_get_main (),
 548                                              &sctp_conn->sub_conn
 549                                              [SCTP_PRIMARY_PATH_IDX].connection.
 550                                              lcl_ip.ip4, &ipv4->address);
 551
 552                 break;
 553               }
 554             case SCTP_IPV6_ADDRESS_TYPE:
 555               {
 556                 sctp_ipv6_addr_param_t *ipv6 =
 557                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 558
 559                 sctp_sub_connection_add_ip6 (vlib_get_main (),
 560                                              &sctp_conn->sub_conn
 561                                              [SCTP_PRIMARY_PATH_IDX].connection.
 562                                              lcl_ip.ip6, &ipv6->address);
 563
 564                 break;
 565               }
 566             case SCTP_STATE_COOKIE_TYPE:
 567               {
 568                 sctp_state_cookie_param_t *state_cookie_param =
 569                   (sctp_state_cookie_param_t *) opt_params_hdr;
 570
 571                 clib_memcpy (&(sctp_conn->cookie_param), state_cookie_param,
 572                              sizeof (sctp_state_cookie_param_t));
 573
 574                 break;
 575               }
 576             case SCTP_HOSTNAME_ADDRESS_TYPE:
 577               {
 578                 sctp_hostname_param_t *hostname_addr =
 579                   (sctp_hostname_param_t *) opt_params_hdr;
 580                 clib_memcpy (hostname, hostname_addr->hostname,
 581                              FQDN_MAX_LENGTH);
 582                 break;
 583               }
 584             case SCTP_UNRECOGNIZED_TYPE:
 585               {
 586                 break;
 587               }
 588             }
 589           u16 increment = clib_net_to_host_u16 (opt_params_hdr->length);
 590           /* This indicates something really bad happened */
 591           if (increment == 0)
 592             {
 593               return SCTP_ERROR_INVALID_TAG;
 594             }
 595           pointer_offset += increment;
 596         }
 597     }
 598
 599   sctp_prepare_cookie_echo_chunk (sctp_conn, idx, b0, 1);
 600
 601   /* Start the T1_COOKIE timer */
 602   sctp_timer_set (sctp_conn, idx,
 603                   SCTP_TIMER_T1_COOKIE, sctp_conn->sub_conn[idx].RTO);
 604
 605   return SCTP_ERROR_NONE;
 606 }
 607
 608 /** Enqueue data out-of-order for delivery to application */
 609 always_inline int
 610 sctp_session_enqueue_data_ooo (sctp_connection_t * sctp_conn,
 611                                vlib_buffer_t * b, u16 data_len, u8 conn_idx)
 612 {
 613   int written, error = SCTP_ERROR_ENQUEUED;
 614
 615   written =
 616     session_enqueue_stream_connection (&sctp_conn->
 617                                        sub_conn[conn_idx].connection, b, 0,
 618                                        1 /* queue event */ ,
 619                                        0);
 620
 621   /* Update next_tsn_expected */
 622   if (PREDICT_TRUE (written == data_len))
 623     {
 624       sctp_conn->next_tsn_expected += written;
 625
 626       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 627                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 628                     written, data_len);
 629     }
 630   /* If more data written than expected, account for out-of-order bytes. */
 631   else if (written > data_len)
 632     {
 633       sctp_conn->next_tsn_expected += written;
 634
 635       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 636                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 637                     written, data_len);
 638     }
 639   else if (written > 0)
 640     {
 641       /* We've written something but FIFO is probably full now */
 642       sctp_conn->next_tsn_expected += written;
 643
 644       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 645
 646       SCTP_ADV_DBG
 647         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 648          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 649     }
 650   else
 651     {
 652       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 653                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 654
 655       return SCTP_ERROR_FIFO_FULL;
 656     }
 657
 658   /* TODO: Update out_of_order_map & SACK list */
 659
 660   return error;
 661 }
 662
 663 /** Enqueue data for delivery to application */
 664 always_inline int
 665 sctp_session_enqueue_data (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
 666                            u16 data_len, u8 conn_idx)
 667 {
 668   int written, error = SCTP_ERROR_ENQUEUED;
 669
 670   written =
 671     session_enqueue_stream_connection (&sctp_conn->
 672                                        sub_conn[conn_idx].connection, b, 0,
 673                                        1 /* queue event */ ,
 674                                        1);
 675
 676   /* Update next_tsn_expected */
 677   if (PREDICT_TRUE (written == data_len))
 678     {
 679       sctp_conn->next_tsn_expected += written;
 680
 681       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 682                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 683                     written, data_len);
 684     }
 685   /* If more data written than expected, account for out-of-order bytes. */
 686   else if (written > data_len)
 687     {
 688       sctp_conn->next_tsn_expected += written;
 689
 690       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 691                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 692                     written, data_len);
 693     }
 694   else if (written > 0)
 695     {
 696       /* We've written something but FIFO is probably full now */
 697       sctp_conn->next_tsn_expected += written;
 698
 699       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 700
 701       SCTP_ADV_DBG
 702         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 703          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 704     }
 705   else
 706     {
 707       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 708                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 709
 710       return SCTP_ERROR_FIFO_FULL;
 711     }
 712
 713   return error;
 714 }
 715
 716 always_inline u8
 717 sctp_is_sack_delayable (sctp_connection_t * sctp_conn, u8 idx, u8 is_gapping)
 718 {
 719   if (sctp_conn->conn_config.never_delay_sack)
 720     {
 721       SCTP_CONN_TRACKING_DBG ("sctp_conn->conn_config.never_delay_sack = ON");
 722       return 0;
 723     }
 724
 725   /* Section 4.4 of the RFC4960 */
 726   if (sctp_conn->state == SCTP_STATE_SHUTDOWN_SENT)
 727     {
 728       SCTP_CONN_TRACKING_DBG ("sctp_conn->state = %s; SACK not delayable",
 729                               sctp_state_to_string (sctp_conn->state));
 730       return 0;
 731     }
 732
 733   if (is_gapping)
 734     {
 735       SCTP_CONN_TRACKING_DBG
 736         ("gapping != 0: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 737          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 738       return 0;
 739     }
 740
 741   sctp_conn->ack_state += 1;
 742   if (sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS)
 743     {
 744       SCTP_CONN_TRACKING_DBG
 745         ("sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 746          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 747       return 0;
 748     }
 749
 750   return 1;
 751 }
 752
 753 always_inline void
 754 sctp_is_connection_gapping (sctp_connection_t * sctp_conn, u32 tsn,
 755                             u8 * gapping)
 756 {
 757   if (sctp_conn->next_tsn_expected != tsn)      // It means data transmission is GAPPING
 758     {
 759       SCTP_CONN_TRACKING_DBG
 760         ("GAPPING: CONN_INDEX = %u, sctp_conn->next_tsn_expected = %u, tsn = %u, diff = %u",
 761          sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.c_index,
 762          sctp_conn->next_tsn_expected, tsn,
 763          sctp_conn->next_tsn_expected - tsn);
 764
 765       *gapping = 1;
 766     }
 767 }
 768
 769 always_inline u16
 770 sctp_handle_data (sctp_payload_data_chunk_t * sctp_data_chunk,
 771                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b,
 772                   u16 * next0)
 773 {
 774   u32 error = 0, n_data_bytes;
 775   u8 is_gapping = 0;
 776
 777   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 778   if (sctp_conn->local_tag != sctp_data_chunk->sctp_hdr.verification_tag)
 779     {
 780       return SCTP_ERROR_INVALID_TAG;
 781     }
 782
 783   vnet_buffer (b)->sctp.sid = sctp_data_chunk->stream_id;
 784   vnet_buffer (b)->sctp.ssn = sctp_data_chunk->stream_seq;
 785
 786   u32 tsn = clib_net_to_host_u32 (sctp_data_chunk->tsn);
 787
 788   vlib_buffer_advance (b, vnet_buffer (b)->sctp.data_offset);
 789   n_data_bytes = vnet_buffer (b)->sctp.data_len;
 790   ASSERT (n_data_bytes);
 791
 792   sctp_is_connection_gapping (sctp_conn, tsn, &is_gapping);
 793
 794   sctp_conn->last_rcvd_tsn = tsn;
 795
 796   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 797
 798   u8 bbit = vnet_sctp_get_bbit (&sctp_data_chunk->chunk_hdr);
 799   u8 ebit = vnet_sctp_get_ebit (&sctp_data_chunk->chunk_hdr);
 800
 801   if (bbit == 1 && ebit == 1)   /* Unfragmented message */
 802     {
 803       /* In order data, enqueue. Fifo figures out by itself if any out-of-order
 804        * segments can be enqueued after fifo tail offset changes. */
 805       if (PREDICT_FALSE (is_gapping == 1))
 806         error =
 807           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 808       else
 809         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 810     }
 811   else if (bbit == 1 && ebit == 0)      /* First piece of a fragmented user message */
 812     {
 813       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 814     }
 815   else if (bbit == 0 && ebit == 1)      /* Last piece of a fragmented user message */
 816     {
 817       if (PREDICT_FALSE (is_gapping == 1))
 818         error =
 819           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 820       else
 821         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 822     }
 823   else                          /* Middle piece of a fragmented user message */
 824     {
 825       if (PREDICT_FALSE (is_gapping == 1))
 826         error =
 827           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 828       else
 829         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 830     }
 831   sctp_conn->last_rcvd_tsn = tsn;
 832
 833   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 834
 835   if (!sctp_is_sack_delayable (sctp_conn, idx, is_gapping))
 836     {
 837       *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 838       sctp_prepare_sack_chunk (sctp_conn, idx, b);
 839     }
 840   else
 841     *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 842
 843   sctp_conn->sub_conn[idx].enqueue_state = error;
 844
 845   return error;
 846 }
 847
 848 always_inline u16
 849 sctp_handle_cookie_echo (sctp_header_t * sctp_hdr,
 850                          sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 851                          sctp_connection_t * sctp_conn, u8 idx,
 852                          vlib_buffer_t * b0, u16 * next0)
 853 {
 854   u64 now = sctp_time_now ();
 855
 856   sctp_cookie_echo_chunk_t *cookie_echo =
 857     (sctp_cookie_echo_chunk_t *) sctp_hdr;
 858
 859   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 860   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 861     {
 862       return SCTP_ERROR_INVALID_TAG;
 863     }
 864
 865   sctp_calculate_rto (sctp_conn, idx);
 866
 867   u64 creation_time =
 868     clib_net_to_host_u64 (cookie_echo->cookie.creation_time);
 869   u64 cookie_lifespan =
 870     clib_net_to_host_u32 (cookie_echo->cookie.cookie_lifespan);
 871
 872   if (now > creation_time + cookie_lifespan)
 873     {
 874       SCTP_DBG ("now (%u) > creation_time (%u) + cookie_lifespan (%u)",
 875                 now, creation_time, cookie_lifespan);
 876       return SCTP_ERROR_COOKIE_ECHO_VIOLATION;
 877     }
 878
 879   sctp_prepare_cookie_ack_chunk (sctp_conn, idx, b0);
 880
 881   /* Change state */
 882   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 883   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 884   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 885
 886   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 887                   sctp_conn->sub_conn[idx].RTO);
 888
 889   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 890
 891   return SCTP_ERROR_NONE;
 892
 893 }
 894
 895 always_inline u16
 896 sctp_handle_cookie_ack (sctp_header_t * sctp_hdr,
 897                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 898                         sctp_connection_t * sctp_conn, u8 idx,
 899                         vlib_buffer_t * b0, u16 * next0)
 900 {
 901   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 902   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 903     {
 904       return SCTP_ERROR_INVALID_TAG;
 905     }
 906
 907   sctp_calculate_rto (sctp_conn, idx);
 908
 909   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_COOKIE);
 910   /* Change state */
 911   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 912   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 913
 914   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 915
 916   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 917                   sctp_conn->sub_conn[idx].RTO);
 918
 919   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 920
 921   return SCTP_ERROR_NONE;
 922
 923 }
 924
 925 always_inline uword
 926 sctp46_rcv_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 927                          vlib_frame_t * from_frame, int is_ip4)
 928 {
 929   sctp_main_t *tm = vnet_get_sctp_main ();
 930
 931   u32 n_left_from, next_index, *from, *to_next;
 932   u32 my_thread_index = vm->thread_index;
 933
 934   from = vlib_frame_vector_args (from_frame);
 935   n_left_from = from_frame->n_vectors;
 936
 937   next_index = node->cached_next_index;
 938
 939   while (n_left_from > 0)
 940     {
 941       u32 n_left_to_next;
 942
 943       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 944
 945       while (n_left_from > 0 && n_left_to_next > 0)
 946         {
 947           u32 bi0;
 948           vlib_buffer_t *b0;
 949           sctp_header_t *sctp_hdr = 0;
 950           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
 951           ip4_header_t *ip4_hdr = 0;
 952           ip6_header_t *ip6_hdr = 0;
 953           sctp_connection_t *sctp_conn, *new_sctp_conn;
 954           u16 sctp_implied_length = 0;
 955           u16 error0 = SCTP_ERROR_NONE, next0 = sctp_next_drop (is_ip4);
 956           u8 idx;
 957
 958           bi0 = from[0];
 959           to_next[0] = bi0;
 960           from += 1;
 961           to_next += 1;
 962           n_left_from -= 1;
 963           n_left_to_next -= 1;
 964
 965           b0 = vlib_get_buffer (vm, bi0);
 966
 967           /* If we are in SCTP_COOKIE_WAIT_STATE then the connection
 968            * will come from the half-open connections pool.
 969            */
 970           sctp_conn =
 971             sctp_half_open_connection_get (vnet_buffer (b0)->
 972                                            sctp.connection_index);
 973
 974           if (PREDICT_FALSE (sctp_conn == 0))
 975             {
 976               SCTP_ADV_DBG
 977                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
 978               error0 = SCTP_ERROR_INVALID_CONNECTION;
 979               goto drop;
 980             }
 981           if (is_ip4)
 982             {
 983               ip4_hdr = vlib_buffer_get_current (b0);
 984               sctp_hdr = ip4_next_header (ip4_hdr);
 985               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
 986             }
 987           else
 988             {
 989               ip6_hdr = vlib_buffer_get_current (b0);
 990               sctp_hdr = ip6_next_header (ip6_hdr);
 991               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
 992             }
 993
 994           sctp_conn->sub_conn[idx].subconn_idx = idx;
 995           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
 996
 997           sctp_chunk_hdr =
 998             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
 999
1000           sctp_implied_length =
1001             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1002
1003           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1004
1005           switch (chunk_type)
1006             {
1007             case INIT_ACK:
1008               error0 =
1009                 sctp_is_valid_init_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1010                                         b0, sctp_implied_length);
1011
1012               if (error0 == SCTP_ERROR_NONE)
1013                 {
1014                   pool_get (tm->connections[my_thread_index], new_sctp_conn);
1015                   clib_memcpy (new_sctp_conn, sctp_conn,
1016                                sizeof (*new_sctp_conn));
1017                   new_sctp_conn->sub_conn[idx].c_c_index =
1018                     new_sctp_conn - tm->connections[my_thread_index];
1019                   new_sctp_conn->sub_conn[idx].c_thread_index =
1020                     my_thread_index;
1021                   new_sctp_conn->sub_conn[idx].PMTU =
1022                     sctp_conn->sub_conn[idx].PMTU;
1023                   new_sctp_conn->sub_conn[idx].subconn_idx = idx;
1024
1025                   if (sctp_half_open_connection_cleanup (sctp_conn))
1026                     {
1027                       SCTP_DBG
1028                         ("Cannot cleanup half-open connection; not the owning thread");
1029                     }
1030
1031                   sctp_connection_timers_init (new_sctp_conn);
1032
1033                   sctp_init_cwnd (new_sctp_conn);
1034
1035                   error0 =
1036                     sctp_handle_init_ack (sctp_hdr, sctp_chunk_hdr,
1037                                           new_sctp_conn, idx, b0,
1038                                           sctp_implied_length);
1039
1040                   if (session_stream_connect_notify
1041                       (&new_sctp_conn->sub_conn[idx].connection, 0))
1042                     {
1043                       SCTP_DBG
1044                         ("conn_index = %u: session_stream_connect_notify error; cleaning up connection",
1045                          new_sctp_conn->sub_conn[idx].connection.c_index);
1046                       sctp_connection_cleanup (new_sctp_conn);
1047                       goto drop;
1048                     }
1049                   next0 = sctp_next_output (is_ip4);
1050                 }
1051               break;
1052
1053             case OPERATION_ERROR:
1054               error0 =
1055                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1056                                            &next0);
1057               break;
1058
1059               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1060                * are handled by the input-dispatcher function using the table-lookup
1061                * hence we should never get to the "default" case below.
1062                */
1063             default:
1064               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1065               next0 = sctp_next_drop (is_ip4);
1066               goto drop;
1067             }
1068
1069           if (error0 != SCTP_ERROR_NONE)
1070             {
1071               clib_warning ("error while parsing chunk");
1072               sctp_connection_cleanup (sctp_conn);
1073               next0 = sctp_next_drop (is_ip4);
1074               goto drop;
1075             }
1076
1077         drop:
1078           b0->error = node->errors[error0];
1079           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1080             {
1081               sctp_rx_trace_t *t0 =
1082                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1083               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1084             }
1085
1086           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1087                                            n_left_to_next, bi0, next0);
1088         }
1089
1090       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1091     }
1092   return from_frame->n_vectors;
1093 }
1094
1095 static uword
1096 sctp4_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1097                  vlib_frame_t * from_frame)
1098 {
1099   return sctp46_rcv_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1100 }
1101
1102 static uword
1103 sctp6_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1104                  vlib_frame_t * from_frame)
1105 {
1106   return sctp46_rcv_phase_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1107 }
1108
1109 u8 *
1110 format_sctp_rx_trace_short (u8 * s, va_list * args)
1111 {
1112   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1113   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1114   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1115
1116   s = format (s, "%d -> %d (%U)",
1117               clib_net_to_host_u16 (t->sctp_header.src_port),
1118               clib_net_to_host_u16 (t->sctp_header.dst_port),
1119               format_sctp_state, t->sctp_connection.state);
1120
1121   return s;
1122 }
1123
1124 /* *INDENT-OFF* */
1125 VLIB_REGISTER_NODE (sctp4_rcv_phase_node) =
1126 {
1127   .function = sctp4_rcv_phase,
1128   .name = "sctp4-rcv",
1129   /* Takes a vector of packets. */
1130   .vector_size = sizeof (u32),
1131   .n_errors = SCTP_N_ERROR,
1132   .error_strings = sctp_error_strings,
1133   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1134   .next_nodes =
1135   {
1136 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1137     foreach_sctp_state_next
1138 #undef _
1139   },
1140   .format_trace = format_sctp_rx_trace_short,
1141 };
1142 /* *INDENT-ON* */
1143
1144 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_rcv_phase_node, sctp4_rcv_phase);
1145
1146 /* *INDENT-OFF* */
1147 VLIB_REGISTER_NODE (sctp6_init_phase_node) =
1148 {
1149   .function = sctp6_rcv_phase,
1150   .name = "sctp6-rcv",
1151   /* Takes a vector of packets. */
1152   .vector_size = sizeof (u32),
1153   .n_errors = SCTP_N_ERROR,
1154   .error_strings = sctp_error_strings,
1155   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1156   .next_nodes =
1157   {
1158 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1159     foreach_sctp_state_next
1160 #undef _
1161   },
1162   .format_trace = format_sctp_rx_trace_short,
1163 };
1164 /* *INDENT-ON* */
1165
1166 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_init_phase_node, sctp6_rcv_phase);
1167
1168 vlib_node_registration_t sctp4_shutdown_phase_node;
1169 vlib_node_registration_t sctp6_shutdown_phase_node;
1170
1171 always_inline u16
1172 sctp_handle_shutdown (sctp_header_t * sctp_hdr,
1173                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1174                       sctp_connection_t * sctp_conn, u8 idx,
1175                       vlib_buffer_t * b0, u16 sctp_implied_length,
1176                       u16 * next0)
1177 {
1178   sctp_shutdown_association_chunk_t *shutdown_chunk =
1179     (sctp_shutdown_association_chunk_t *) (sctp_hdr);
1180
1181   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1182   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1183     {
1184       return SCTP_ERROR_INVALID_TAG;
1185     }
1186
1187   /*
1188    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1189    */
1190   if (sctp_is_bundling (sctp_implied_length, &shutdown_chunk->chunk_hdr))
1191     return SCTP_ERROR_BUNDLING_VIOLATION;
1192
1193   switch (sctp_conn->state)
1194     {
1195     case SCTP_STATE_ESTABLISHED:
1196       if (sctp_check_outstanding_data_chunks (sctp_conn) == 0)
1197         sctp_conn->state = SCTP_STATE_SHUTDOWN_RECEIVED;
1198       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1199       break;
1200
1201     case SCTP_STATE_SHUTDOWN_SENT:
1202       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1203       break;
1204     }
1205
1206   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1207
1208   return SCTP_ERROR_NONE;
1209 }
1210
1211 always_inline u16
1212 sctp_handle_shutdown_ack (sctp_header_t * sctp_hdr,
1213                           sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1214                           sctp_connection_t * sctp_conn, u8 idx,
1215                           vlib_buffer_t * b0, u16 sctp_implied_length,
1216                           u16 * next0)
1217 {
1218   sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
1219     (sctp_shutdown_ack_chunk_t *) (sctp_hdr);
1220
1221   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1222   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1223     {
1224       return SCTP_ERROR_INVALID_TAG;
1225     }
1226
1227   /*
1228    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1229    */
1230   if (sctp_is_bundling (sctp_implied_length, &shutdown_ack_chunk->chunk_hdr))
1231     return SCTP_ERROR_BUNDLING_VIOLATION;
1232
1233   /* Whether we are in SCTP_STATE_SHUTDOWN_SENT or SCTP_STATE_SHUTDOWN_ACK_SENT
1234    * the reception of a SHUTDOWN_ACK chunk leads to the same actions:
1235    * - STOP T2_SHUTDOWN timer
1236    * - SEND SHUTDOWN_COMPLETE chunk
1237    */
1238   sctp_timer_reset (sctp_conn, SCTP_PRIMARY_PATH_IDX, SCTP_TIMER_T2_SHUTDOWN);
1239
1240   sctp_send_shutdown_complete (sctp_conn, idx, b0);
1241
1242   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1243
1244   return SCTP_ERROR_NONE;
1245 }
1246
1247 always_inline u16
1248 sctp_handle_shutdown_complete (sctp_header_t * sctp_hdr,
1249                                sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1250                                sctp_connection_t * sctp_conn, u8 idx,
1251                                vlib_buffer_t * b0, u16 sctp_implied_length,
1252                                u16 * next0)
1253 {
1254   sctp_shutdown_complete_chunk_t *shutdown_complete =
1255     (sctp_shutdown_complete_chunk_t *) (sctp_hdr);
1256
1257   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1258   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1259     {
1260       return SCTP_ERROR_INVALID_TAG;
1261     }
1262
1263   /*
1264    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1265    */
1266   if (sctp_is_bundling (sctp_implied_length, &shutdown_complete->chunk_hdr))
1267     return SCTP_ERROR_BUNDLING_VIOLATION;
1268
1269   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN);
1270
1271   stream_session_disconnect_notify (&sctp_conn->sub_conn[idx].connection);
1272
1273   sctp_conn->state = SCTP_STATE_CLOSED;
1274
1275   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1276
1277   return SCTP_ERROR_NONE;
1278 }
1279
1280 always_inline uword
1281 sctp46_shutdown_phase_inline (vlib_main_t * vm,
1282                               vlib_node_runtime_t * node,
1283                               vlib_frame_t * from_frame, int is_ip4)
1284 {
1285   u32 n_left_from, next_index, *from, *to_next;
1286   u32 my_thread_index = vm->thread_index;
1287
1288   from = vlib_frame_vector_args (from_frame);
1289   n_left_from = from_frame->n_vectors;
1290
1291   next_index = node->cached_next_index;
1292
1293   while (n_left_from > 0)
1294     {
1295       u32 n_left_to_next;
1296
1297       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1298
1299       while (n_left_from > 0 && n_left_to_next > 0)
1300         {
1301           u32 bi0;
1302           vlib_buffer_t *b0;
1303           sctp_rx_trace_t *sctp_trace;
1304           sctp_header_t *sctp_hdr = 0;
1305           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1306           ip4_header_t *ip4_hdr = 0;
1307           ip6_header_t *ip6_hdr = 0;
1308           sctp_connection_t *sctp_conn;
1309           u16 sctp_implied_length = 0;
1310           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
1311           u8 idx = 0;
1312
1313           bi0 = from[0];
1314           to_next[0] = bi0;
1315           from += 1;
1316           to_next += 1;
1317           n_left_from -= 1;
1318           n_left_to_next -= 1;
1319
1320           b0 = vlib_get_buffer (vm, bi0);
1321           sctp_conn =
1322             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1323                                  my_thread_index);
1324
1325           if (PREDICT_FALSE (sctp_conn == 0))
1326             {
1327               SCTP_DBG
1328                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1329               error0 = SCTP_ERROR_INVALID_CONNECTION;
1330               goto drop;
1331             }
1332
1333           if (is_ip4)
1334             {
1335               ip4_hdr = vlib_buffer_get_current (b0);
1336               sctp_hdr = ip4_next_header (ip4_hdr);
1337               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1338             }
1339           else
1340             {
1341               ip6_hdr = vlib_buffer_get_current (b0);
1342               sctp_hdr = ip6_next_header (ip6_hdr);
1343               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1344             }
1345
1346           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1347           sctp_chunk_hdr = &full_hdr->common_hdr;
1348
1349           sctp_implied_length =
1350             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1351
1352           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1353           switch (chunk_type)
1354             {
1355             case SHUTDOWN:
1356               error0 =
1357                 sctp_handle_shutdown (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1358                                       idx, b0, sctp_implied_length, &next0);
1359               break;
1360
1361             case SHUTDOWN_ACK:
1362               error0 =
1363                 sctp_handle_shutdown_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1364                                           idx, b0, sctp_implied_length,
1365                                           &next0);
1366               break;
1367
1368             case SHUTDOWN_COMPLETE:
1369               error0 =
1370                 sctp_handle_shutdown_complete (sctp_hdr, sctp_chunk_hdr,
1371                                                sctp_conn, idx, b0,
1372                                                sctp_implied_length, &next0);
1373
1374               sctp_connection_cleanup (sctp_conn);
1375               break;
1376
1377               /*
1378                * DATA chunks can still be transmitted/received in the SHUTDOWN-PENDING
1379                * and SHUTDOWN-SENT states (as per RFC4960 Section 6)
1380                */
1381             case DATA:
1382               error0 =
1383                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1384                                   sctp_conn, idx, b0, &next0);
1385               break;
1386
1387             case OPERATION_ERROR:
1388               error0 =
1389                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1390                                            &next0);
1391               break;
1392
1393             case COOKIE_ECHO:   /* Cookie Received While Shutting Down */
1394               sctp_prepare_operation_error (sctp_conn, idx, b0,
1395                                             COOKIE_RECEIVED_WHILE_SHUTTING_DOWN);
1396               error0 = SCTP_ERROR_NONE;
1397               next0 = sctp_next_output (is_ip4);
1398               break;
1399               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1400                * are handled by the input-dispatcher function using the table-lookup
1401                * hence we should never get to the "default" case below.
1402                */
1403             default:
1404               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1405               next0 = sctp_next_drop (is_ip4);
1406               goto drop;
1407             }
1408
1409           if (error0 != SCTP_ERROR_NONE)
1410             {
1411               clib_warning ("error while parsing chunk");
1412               sctp_connection_cleanup (sctp_conn);
1413               next0 = sctp_next_drop (is_ip4);
1414               goto drop;
1415             }
1416
1417         drop:
1418           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1419             {
1420               sctp_trace =
1421                 vlib_add_trace (vm, node, b0, sizeof (*sctp_trace));
1422
1423               if (sctp_hdr != NULL)
1424                 clib_memcpy (&sctp_trace->sctp_header, sctp_hdr,
1425                              sizeof (sctp_trace->sctp_header));
1426
1427               if (sctp_conn != NULL)
1428                 clib_memcpy (&sctp_trace->sctp_connection, sctp_conn,
1429                              sizeof (sctp_trace->sctp_connection));
1430             }
1431
1432           b0->error = node->errors[error0];
1433
1434           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1435                                            n_left_to_next, bi0, next0);
1436         }
1437
1438       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1439     }
1440
1441   return from_frame->n_vectors;
1442
1443 }
1444
1445 static uword
1446 sctp4_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1447                       vlib_frame_t * from_frame)
1448 {
1449   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1450 }
1451
1452 static uword
1453 sctp6_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1454                       vlib_frame_t * from_frame)
1455 {
1456   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1457 }
1458
1459 /* *INDENT-OFF* */
1460 VLIB_REGISTER_NODE (sctp4_shutdown_phase_node) =
1461 {
1462   .function = sctp4_shutdown_phase,
1463   .name = "sctp4-shutdown",
1464   /* Takes a vector of packets. */
1465   .vector_size = sizeof (u32),
1466   .n_errors = SCTP_N_ERROR,
1467   .error_strings = sctp_error_strings,
1468   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1469   .next_nodes =
1470   {
1471 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1472     foreach_sctp_state_next
1473 #undef _
1474   },
1475   .format_trace = format_sctp_rx_trace_short,
1476 };
1477 /* *INDENT-ON* */
1478
1479 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_shutdown_phase_node,
1480                               sctp4_shutdown_phase);
1481
1482 /* *INDENT-OFF* */
1483 VLIB_REGISTER_NODE (sctp6_shutdown_phase_node) =
1484 {
1485   .function = sctp6_shutdown_phase,
1486   .name = "sctp6-shutdown",
1487   /* Takes a vector of packets. */
1488   .vector_size = sizeof (u32),
1489   .n_errors = SCTP_N_ERROR,
1490   .error_strings = sctp_error_strings,
1491   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1492   .next_nodes =
1493   {
1494 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1495     foreach_sctp_state_next
1496 #undef _
1497   },
1498   .format_trace = format_sctp_rx_trace_short,
1499 };
1500 /* *INDENT-ON* */
1501
1502 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_shutdown_phase_node,
1503                               sctp6_shutdown_phase);
1504
1505 vlib_node_registration_t sctp4_listen_phase_node;
1506 vlib_node_registration_t sctp6_listen_phase_node;
1507
1508 vlib_node_registration_t sctp4_established_phase_node;
1509 vlib_node_registration_t sctp6_established_phase_node;
1510
1511 always_inline u16
1512 sctp_handle_sack (sctp_selective_ack_chunk_t * sack_chunk,
1513                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b0,
1514                   u16 * next0)
1515 {
1516
1517   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1518   if (sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag)
1519     {
1520       SCTP_ADV_DBG
1521         ("sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag");
1522
1523       *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1524
1525       return SCTP_ERROR_INVALID_TAG;
1526     }
1527
1528   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_SACK_RECEIVED;
1529
1530   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1531
1532   /* Section 7.2.2; point (2) */
1533   if (sctp_conn->sub_conn[idx].cwnd > sctp_conn->sub_conn[idx].ssthresh)
1534     sctp_conn->sub_conn[idx].partially_acked_bytes =
1535       sctp_conn->next_tsn - sack_chunk->cumulative_tsn_ack;
1536
1537   /* Section 7.2.2; point (5) */
1538   if (sctp_conn->next_tsn - sack_chunk->cumulative_tsn_ack == 0)
1539     sctp_conn->sub_conn[idx].partially_acked_bytes = 0;
1540
1541   sctp_conn->last_unacked_tsn = sack_chunk->cumulative_tsn_ack;
1542
1543   sctp_calculate_rto (sctp_conn, idx);
1544
1545   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1546                      sctp_conn->sub_conn[idx].RTO);
1547
1548   sctp_conn->sub_conn[idx].RTO_pending = 0;
1549
1550   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1551
1552   return SCTP_ERROR_NONE;
1553 }
1554
1555 always_inline u16
1556 sctp_handle_heartbeat (sctp_hb_req_chunk_t * sctp_hb_chunk,
1557                        sctp_connection_t * sctp_conn, u8 idx,
1558                        vlib_buffer_t * b0, u16 * next0)
1559 {
1560   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1561   if (sctp_conn->local_tag != sctp_hb_chunk->sctp_hdr.verification_tag)
1562     {
1563       return SCTP_ERROR_INVALID_TAG;
1564     }
1565
1566   sctp_prepare_heartbeat_ack_chunk (sctp_conn, idx, b0);
1567
1568   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1569
1570   return SCTP_ERROR_NONE;
1571 }
1572
1573 always_inline u16
1574 sctp_handle_heartbeat_ack (sctp_hb_ack_chunk_t * sctp_hb_ack_chunk,
1575                            sctp_connection_t * sctp_conn, u8 idx,
1576                            vlib_buffer_t * b0, u16 * next0)
1577 {
1578   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1579
1580   sctp_conn->sub_conn[idx].unacknowledged_hb -= 1;
1581
1582   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
1583                      sctp_conn->sub_conn[idx].RTO);
1584
1585   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1586
1587   return SCTP_ERROR_NONE;
1588 }
1589
1590 always_inline void
1591 sctp_node_inc_counter (vlib_main_t * vm, u32 sctp4_node, u32 sctp6_node,
1592                        u8 is_ip4, u8 evt, u8 val)
1593 {
1594   if (PREDICT_TRUE (!val))
1595     return;
1596
1597   if (is_ip4)
1598     vlib_node_increment_counter (vm, sctp4_node, evt, val);
1599   else
1600     vlib_node_increment_counter (vm, sctp6_node, evt, val);
1601 }
1602
1603 always_inline uword
1604 sctp46_listen_process_inline (vlib_main_t * vm,
1605                               vlib_node_runtime_t * node,
1606                               vlib_frame_t * from_frame, int is_ip4)
1607 {
1608   u32 n_left_from, next_index, *from, *to_next;
1609   u32 my_thread_index = vm->thread_index;
1610
1611   from = vlib_frame_vector_args (from_frame);
1612   n_left_from = from_frame->n_vectors;
1613
1614   next_index = node->cached_next_index;
1615
1616   while (n_left_from > 0)
1617     {
1618       u32 n_left_to_next;
1619
1620       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1621
1622       while (n_left_from > 0 && n_left_to_next > 0)
1623         {
1624           u32 bi0;
1625           vlib_buffer_t *b0;
1626           sctp_header_t *sctp_hdr = 0;
1627           ip4_header_t *ip4_hdr;
1628           ip6_header_t *ip6_hdr;
1629           sctp_connection_t *child_conn;
1630           sctp_connection_t *sctp_listener;
1631           u16 next0 = sctp_next_drop (is_ip4), error0 = SCTP_ERROR_ENQUEUED;
1632
1633           bi0 = from[0];
1634           to_next[0] = bi0;
1635           from += 1;
1636           to_next += 1;
1637           n_left_from -= 1;
1638           n_left_to_next -= 1;
1639
1640           b0 = vlib_get_buffer (vm, bi0);
1641           sctp_listener =
1642             sctp_listener_get (vnet_buffer (b0)->sctp.connection_index);
1643
1644           if (is_ip4)
1645             {
1646               ip4_hdr = vlib_buffer_get_current (b0);
1647               sctp_hdr = ip4_next_header (ip4_hdr);
1648             }
1649           else
1650             {
1651               ip6_hdr = vlib_buffer_get_current (b0);
1652               sctp_hdr = ip6_next_header (ip6_hdr);
1653             }
1654
1655           child_conn =
1656             sctp_lookup_connection (sctp_listener->sub_conn
1657                                     [SCTP_PRIMARY_PATH_IDX].c_fib_index, b0,
1658                                     my_thread_index, is_ip4);
1659
1660           if (PREDICT_FALSE (child_conn->state != SCTP_STATE_CLOSED))
1661             {
1662               SCTP_DBG
1663                 ("conn_index = %u: child_conn->state != SCTP_STATE_CLOSED.... STATE=%s",
1664                  child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
1665                  connection.c_index,
1666                  sctp_state_to_string (child_conn->state));
1667               error0 = SCTP_ERROR_CREATE_EXISTS;
1668               goto drop;
1669             }
1670
1671           /* Create child session and send SYN-ACK */
1672           child_conn = sctp_connection_new (my_thread_index);
1673           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].subconn_idx =
1674             SCTP_PRIMARY_PATH_IDX;
1675           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_port =
1676             sctp_hdr->dst_port;
1677           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_port =
1678             sctp_hdr->src_port;
1679           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_is_ip4 = is_ip4;
1680           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.proto =
1681             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.proto;
1682           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU =
1683             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU;
1684           child_conn->state = SCTP_STATE_CLOSED;
1685           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.fib_index =
1686             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].
1687             connection.fib_index;
1688
1689           if (is_ip4)
1690             {
1691               child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_ip4.as_u32 =
1692                 ip4_hdr->dst_address.as_u32;
1693               child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_ip4.as_u32 =
1694                 ip4_hdr->src_address.as_u32;
1695             }
1696           else
1697             {
1698               clib_memcpy (&child_conn->
1699                            sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_ip6,
1700                            &ip6_hdr->dst_address, sizeof (ip6_address_t));
1701               clib_memcpy (&child_conn->
1702                            sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_ip6,
1703                            &ip6_hdr->src_address, sizeof (ip6_address_t));
1704             }
1705
1706           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1707           sctp_chunks_common_hdr_t *sctp_chunk_hdr = &full_hdr->common_hdr;
1708
1709           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1710           if (chunk_type != INIT && chunk_type != DATA
1711               && chunk_type != OPERATION_ERROR)
1712             {
1713               SCTP_DBG
1714                 ("conn_index = %u: chunk_type != INIT... chunk_type=%s",
1715                  child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
1716                  connection.c_index, sctp_chunk_to_string (chunk_type));
1717
1718               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1719               next0 = sctp_next_drop (is_ip4);
1720               goto drop;
1721             }
1722
1723           u16 sctp_implied_length =
1724             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1725
1726           switch (chunk_type)
1727             {
1728             case INIT:
1729               sctp_connection_timers_init (child_conn);
1730
1731               sctp_init_snd_vars (child_conn);
1732
1733               sctp_init_cwnd (child_conn);
1734
1735               error0 =
1736                 sctp_handle_init (sctp_hdr, sctp_chunk_hdr, child_conn, b0,
1737                                   sctp_implied_length);
1738
1739               if (error0 == SCTP_ERROR_NONE)
1740                 {
1741                   if (stream_session_accept
1742                       (&child_conn->
1743                        sub_conn[SCTP_PRIMARY_PATH_IDX].connection,
1744                        sctp_listener->
1745                        sub_conn[SCTP_PRIMARY_PATH_IDX].c_s_index, 0))
1746                     {
1747                       clib_warning ("session accept fail");
1748                       sctp_connection_cleanup (child_conn);
1749                       error0 = SCTP_ERROR_CREATE_SESSION_FAIL;
1750                       goto drop;
1751                     }
1752                   next0 = sctp_next_output (is_ip4);
1753                 }
1754               break;
1755
1756               /* Reception of a DATA chunk whilst in the CLOSED state is called
1757                * "Out of the Blue" packet and handling of the chunk needs special treatment
1758                * as per RFC4960 section 8.4
1759                */
1760             case DATA:
1761               break;
1762
1763             case OPERATION_ERROR:
1764               error0 =
1765                 sctp_handle_operation_err (sctp_hdr, child_conn,
1766                                            SCTP_PRIMARY_PATH_IDX, b0, &next0);
1767               break;
1768             }
1769
1770         drop:
1771           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1772             {
1773               sctp_rx_trace_t *t0 =
1774                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1775               clib_memcpy (&t0->sctp_header, sctp_hdr,
1776                            sizeof (t0->sctp_header));
1777               clib_memcpy (&t0->sctp_connection, sctp_listener,
1778                            sizeof (t0->sctp_connection));
1779             }
1780
1781           b0->error = node->errors[error0];
1782
1783           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1784                                            n_left_to_next, bi0, next0);
1785         }
1786       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1787
1788     }
1789   return from_frame->n_vectors;
1790 }
1791
1792 static uword
1793 sctp4_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1794                     vlib_frame_t * from_frame)
1795 {
1796   return sctp46_listen_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1797 }
1798
1799 static uword
1800 sctp6_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1801                     vlib_frame_t * from_frame)
1802 {
1803   return sctp46_listen_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1804 }
1805
1806 always_inline uword
1807 sctp46_established_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1808                                  vlib_frame_t * from_frame, int is_ip4)
1809 {
1810   u32 n_left_from, next_index, *from, *to_next;
1811   u32 my_thread_index = vm->thread_index, errors = 0;
1812
1813   from = vlib_frame_vector_args (from_frame);
1814   n_left_from = from_frame->n_vectors;
1815
1816   next_index = node->cached_next_index;
1817
1818   while (n_left_from > 0)
1819     {
1820       u32 n_left_to_next;
1821
1822       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1823
1824       while (n_left_from > 0 && n_left_to_next > 0)
1825         {
1826           u32 bi0;
1827           vlib_buffer_t *b0;
1828           sctp_header_t *sctp_hdr = 0;
1829           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1830           ip4_header_t *ip4_hdr = 0;
1831           ip6_header_t *ip6_hdr = 0;
1832           sctp_connection_t *sctp_conn;
1833           u16 error0 = SCTP_ERROR_ENQUEUED, next0 =
1834             SCTP_ESTABLISHED_PHASE_N_NEXT;
1835           u8 idx;
1836
1837           bi0 = from[0];
1838           to_next[0] = bi0;
1839           from += 1;
1840           to_next += 1;
1841           n_left_from -= 1;
1842           n_left_to_next -= 1;
1843
1844           b0 = vlib_get_buffer (vm, bi0);
1845           sctp_conn =
1846             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1847                                  my_thread_index);
1848
1849           if (PREDICT_FALSE (sctp_conn == 0))
1850             {
1851               SCTP_DBG
1852                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1853               error0 = SCTP_ERROR_INVALID_CONNECTION;
1854               goto done;
1855             }
1856           if (is_ip4)
1857             {
1858               ip4_hdr = vlib_buffer_get_current (b0);
1859               sctp_hdr = ip4_next_header (ip4_hdr);
1860               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1861             }
1862           else
1863             {
1864               ip6_hdr = vlib_buffer_get_current (b0);
1865               sctp_hdr = ip6_next_header (ip6_hdr);
1866               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1867             }
1868
1869           sctp_conn->sub_conn[idx].subconn_idx = idx;
1870
1871           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1872           sctp_chunk_hdr =
1873             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
1874
1875           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1876
1877           switch (chunk_type)
1878             {
1879             case COOKIE_ECHO:
1880               error0 =
1881                 sctp_handle_cookie_echo (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1882                                          idx, b0, &next0);
1883               break;
1884
1885             case COOKIE_ACK:
1886               error0 =
1887                 sctp_handle_cookie_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1888                                         idx, b0, &next0);
1889               break;
1890
1891             case SACK:
1892               error0 =
1893                 sctp_handle_sack ((sctp_selective_ack_chunk_t *) sctp_hdr,
1894                                   sctp_conn, idx, b0, &next0);
1895               break;
1896
1897             case HEARTBEAT:
1898               error0 =
1899                 sctp_handle_heartbeat ((sctp_hb_req_chunk_t *) sctp_hdr,
1900                                        sctp_conn, idx, b0, &next0);
1901               break;
1902
1903             case HEARTBEAT_ACK:
1904               error0 =
1905                 sctp_handle_heartbeat_ack ((sctp_hb_ack_chunk_t *) sctp_hdr,
1906                                            sctp_conn, idx, b0, &next0);
1907               break;
1908
1909             case DATA:
1910               error0 =
1911                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1912                                   sctp_conn, idx, b0, &next0);
1913               break;
1914
1915             case OPERATION_ERROR:
1916               error0 =
1917                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1918                                            &next0);
1919               break;
1920
1921               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1922                * are handled by the input-dispatcher function using the table-lookup
1923                * hence we should never get to the "default" case below.
1924                */
1925             default:
1926               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1927               next0 = sctp_next_drop (is_ip4);
1928               goto done;
1929             }
1930
1931         done:
1932           b0->error = node->errors[error0];
1933           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1934             {
1935               sctp_rx_trace_t *t0 =
1936                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1937               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1938             }
1939
1940           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1941                                            n_left_to_next, bi0, next0);
1942         }
1943
1944       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1945     }
1946
1947   errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_SCTP,
1948                                                  my_thread_index);
1949
1950   sctp_node_inc_counter (vm, is_ip4, sctp4_established_phase_node.index,
1951                          sctp6_established_phase_node.index,
1952                          SCTP_ERROR_EVENT_FIFO_FULL, errors);
1953   sctp_flush_frame_to_output (vm, my_thread_index, is_ip4);
1954
1955   return from_frame->n_vectors;
1956 }
1957
1958 static uword
1959 sctp4_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1960                          vlib_frame_t * from_frame)
1961 {
1962   return sctp46_established_phase_inline (vm, node, from_frame,
1963                                           1 /* is_ip4 */ );
1964 }
1965
1966 static uword
1967 sctp6_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1968                          vlib_frame_t * from_frame)
1969 {
1970   return sctp46_established_phase_inline (vm, node, from_frame,
1971                                           0 /* is_ip4 */ );
1972 }
1973
1974 u8 *
1975 format_sctp_rx_trace (u8 * s, va_list * args)
1976 {
1977   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1978   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1979   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1980   u32 indent = format_get_indent (s);
1981
1982   s = format (s, "%U\n%U%U",
1983               format_sctp_header, &t->sctp_header, 128,
1984               format_white_space, indent,
1985               format_sctp_connection, &t->sctp_connection, 1);
1986
1987   return s;
1988 }
1989
1990 /* *INDENT-OFF* */
1991 VLIB_REGISTER_NODE (sctp4_listen_phase_node) =
1992 {
1993   .function = sctp4_listen_phase,
1994   .name = "sctp4-listen",
1995   /* Takes a vector of packets. */
1996   .vector_size = sizeof (u32),
1997   .n_errors = SCTP_N_ERROR,
1998   .error_strings = sctp_error_strings,
1999   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
2000   .next_nodes =
2001   {
2002 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
2003     foreach_sctp_state_next
2004 #undef _
2005   },
2006   .format_trace = format_sctp_rx_trace_short,
2007 };
2008 /* *INDENT-ON* */
2009
2010 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_listen_phase_node, sctp4_listen_phase);
2011
2012 /* *INDENT-OFF* */
2013 VLIB_REGISTER_NODE (sctp6_listen_phase_node) =
2014 {
2015   .function = sctp6_listen_phase,
2016   .name = "sctp6-listen",
2017   /* Takes a vector of packets. */
2018   .vector_size = sizeof (u32),
2019   .n_errors = SCTP_N_ERROR,
2020   .error_strings = sctp_error_strings,
2021   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
2022   .next_nodes =
2023   {
2024 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
2025     foreach_sctp_state_next
2026 #undef _
2027   },
2028   .format_trace = format_sctp_rx_trace_short,
2029 };
2030 /* *INDENT-ON* */
2031
2032 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_listen_phase_node, sctp6_listen_phase);
2033
2034 /* *INDENT-OFF* */
2035 VLIB_REGISTER_NODE (sctp4_established_phase_node) =
2036 {
2037   .function = sctp4_established_phase,
2038   .name = "sctp4-established",
2039   /* Takes a vector of packets. */
2040   .vector_size = sizeof (u32),
2041   .n_errors = SCTP_N_ERROR,
2042   .error_strings = sctp_error_strings,
2043   .n_next_nodes = SCTP_ESTABLISHED_PHASE_N_NEXT,
2044   .next_nodes =
2045   {
2046 #define _(s,n) [SCTP_ESTABLISHED_PHASE_NEXT_##s] = n,
2047     foreach_sctp_state_next
2048 #undef _
2049   },
2050   .format_trace = format_sctp_rx_trace_short,
2051 };
2052 /* *INDENT-ON* */
2053
2054 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_established_phase_node,
2055                               sctp4_established_phase);
2056
2057 /* *INDENT-OFF* */
2058 VLIB_REGISTER_NODE (sctp6_established_phase_node) =
2059 {
2060   .function = sctp6_established_phase,
2061   .name = "sctp6-established",
2062   /* Takes a vector of packets. */
2063   .vector_size = sizeof (u32),
2064   .n_errors = SCTP_N_ERROR,
2065   .error_strings = sctp_error_strings,
2066   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
2067   .next_nodes =
2068   {
2069 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
2070     foreach_sctp_state_next
2071 #undef _
2072   },
2073   .format_trace = format_sctp_rx_trace_short,
2074 };
2075 /* *INDENT-ON* */
2076
2077 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_established_phase_node,
2078                               sctp6_established_phase);
2079
2080 /*
2081  * This is the function executed first for the SCTP graph.
2082  * It takes care of doing the initial message parsing and
2083  * dispatch to the specialized function.
2084  */
2085 always_inline uword
2086 sctp46_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2087                          vlib_frame_t * from_frame, int is_ip4)
2088 {
2089   u32 n_left_from, next_index, *from, *to_next;
2090   u32 my_thread_index = vm->thread_index;
2091   u8 is_filtered;
2092   sctp_main_t *tm = vnet_get_sctp_main ();
2093
2094   from = vlib_frame_vector_args (from_frame);
2095   n_left_from = from_frame->n_vectors;
2096   next_index = node->cached_next_index;
2097   sctp_set_time_now (my_thread_index);
2098
2099   while (n_left_from > 0)
2100     {
2101       u32 n_left_to_next;
2102
2103       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2104
2105       while (n_left_from > 0 && n_left_to_next > 0)
2106         {
2107           int n_advance_bytes0, n_data_bytes0;
2108           u32 bi0, fib_index0;
2109           vlib_buffer_t *b0;
2110           sctp_header_t *sctp_hdr = 0;
2111           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
2112           sctp_connection_t *sctp_conn;
2113           transport_connection_t *trans_conn;
2114           ip4_header_t *ip4_hdr;
2115           ip6_header_t *ip6_hdr;
2116           u32 error0 = SCTP_ERROR_NO_LISTENER, next0 = SCTP_INPUT_NEXT_DROP;
2117
2118           bi0 = from[0];
2119           to_next[0] = bi0;
2120           from += 1;
2121           to_next += 1;
2122           n_left_from -= 1;
2123           n_left_to_next -= 1;
2124
2125           b0 = vlib_get_buffer (vm, bi0);
2126           vnet_buffer (b0)->sctp.flags = 0;
2127           fib_index0 = vnet_buffer (b0)->ip.fib_index;
2128
2129           /* Checksum computed by ipx_local no need to compute again */
2130
2131           if (is_ip4)
2132             {
2133               ip4_hdr = vlib_buffer_get_current (b0);
2134               sctp_hdr = ip4_next_header (ip4_hdr);
2135
2136               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2137               sctp_chunk_hdr = &full_hdr->common_hdr;
2138
2139               n_advance_bytes0 =
2140                 (ip4_header_bytes (ip4_hdr) +
2141                  sizeof (sctp_payload_data_chunk_t));
2142               n_data_bytes0 =
2143                 clib_net_to_host_u16 (ip4_hdr->length) - n_advance_bytes0;
2144
2145               trans_conn = session_lookup_connection_wt4 (fib_index0,
2146                                                           &ip4_hdr->dst_address,
2147                                                           &ip4_hdr->src_address,
2148                                                           sctp_hdr->dst_port,
2149                                                           sctp_hdr->src_port,
2150                                                           TRANSPORT_PROTO_SCTP,
2151                                                           my_thread_index,
2152                                                           &is_filtered);
2153             }
2154           else
2155             {
2156               ip6_hdr = vlib_buffer_get_current (b0);
2157               sctp_hdr = ip6_next_header (ip6_hdr);
2158
2159               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2160               sctp_chunk_hdr = &full_hdr->common_hdr;
2161
2162               n_advance_bytes0 = sctp_header_bytes ();
2163               n_data_bytes0 =
2164                 clib_net_to_host_u16 (ip6_hdr->payload_length) -
2165                 n_advance_bytes0;
2166               n_advance_bytes0 += sizeof (ip6_hdr[0]);
2167
2168               trans_conn = session_lookup_connection_wt6 (fib_index0,
2169                                                           &ip6_hdr->dst_address,
2170                                                           &ip6_hdr->src_address,
2171                                                           sctp_hdr->dst_port,
2172                                                           sctp_hdr->src_port,
2173                                                           TRANSPORT_PROTO_SCTP,
2174                                                           my_thread_index,
2175                                                           &is_filtered);
2176             }
2177
2178           /* Length check */
2179           if (PREDICT_FALSE (n_advance_bytes0 < 0))
2180             {
2181               error0 = SCTP_ERROR_LENGTH;
2182               goto done;
2183             }
2184
2185           sctp_conn = sctp_get_connection_from_transport (trans_conn);
2186           vnet_sctp_common_hdr_params_net_to_host (sctp_chunk_hdr);
2187
2188           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
2189           if (chunk_type >= UNKNOWN)
2190             {
2191               clib_warning
2192                 ("Received an unrecognized chunk; sending back OPERATION_ERROR chunk");
2193
2194               sctp_prepare_operation_error (sctp_conn, SCTP_PRIMARY_PATH_IDX,
2195                                             b0, UNRECOGNIZED_CHUNK_TYPE);
2196
2197               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
2198               next0 = sctp_next_output (is_ip4);
2199               goto done;
2200             }
2201
2202           vnet_buffer (b0)->sctp.hdr_offset =
2203             (u8 *) sctp_hdr - (u8 *) vlib_buffer_get_current (b0);
2204
2205           /* Session exists */
2206           if (PREDICT_TRUE (0 != sctp_conn))
2207             {
2208               /* Save connection index */
2209               vnet_buffer (b0)->sctp.connection_index = trans_conn->c_index;
2210               vnet_buffer (b0)->sctp.data_offset = n_advance_bytes0;
2211               vnet_buffer (b0)->sctp.data_len = n_data_bytes0;
2212
2213               next0 = tm->dispatch_table[sctp_conn->state][chunk_type].next;
2214               error0 = tm->dispatch_table[sctp_conn->state][chunk_type].error;
2215
2216               SCTP_DBG_STATE_MACHINE
2217                 ("S_INDEX = %u, C_INDEX = %u, TRANS_CONN = %p, SCTP_CONN = %p, CURRENT_CONNECTION_STATE = %s,"
2218                  "CHUNK_TYPE_RECEIVED = %s " "NEXT_PHASE = %s",
2219                  sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
2220                  connection.s_index,
2221                  sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
2222                  connection.c_index, trans_conn, sctp_conn,
2223                  sctp_state_to_string (sctp_conn->state),
2224                  sctp_chunk_to_string (chunk_type), phase_to_string (next0));
2225
2226               if (chunk_type == DATA)
2227                 SCTP_ADV_DBG ("n_advance_bytes0 = %u, n_data_bytes0 = %u",
2228                               n_advance_bytes0, n_data_bytes0);
2229
2230             }
2231           else
2232             {
2233               if (is_filtered)
2234                 {
2235                   next0 = SCTP_INPUT_NEXT_DROP;
2236                   error0 = SCTP_ERROR_FILTERED;
2237                 }
2238               else if ((is_ip4 && tm->punt_unknown4) ||
2239                        (!is_ip4 && tm->punt_unknown6))
2240                 {
2241                   next0 = SCTP_INPUT_NEXT_PUNT_PHASE;
2242                   error0 = SCTP_ERROR_PUNT;
2243                 }
2244               else
2245                 {
2246                   next0 = SCTP_INPUT_NEXT_DROP;
2247                   error0 = SCTP_ERROR_NO_LISTENER;
2248                 }
2249               SCTP_DBG_STATE_MACHINE ("sctp_conn == NULL, NEXT_PHASE = %s",
2250                                       phase_to_string (next0));
2251               sctp_conn = 0;
2252             }
2253
2254         done:
2255           b0->error = error0 ? node->errors[error0] : 0;
2256
2257           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2258             {
2259               sctp_rx_trace_t *t0 =
2260                 vlib_add_trace (vm, node, b0, sizeof (*t0));
2261               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
2262             }
2263           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2264                                            n_left_to_next, bi0, next0);
2265         }
2266
2267       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2268     }
2269   return from_frame->n_vectors;
2270 }
2271
2272 static uword
2273 sctp4_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2274                         vlib_frame_t * from_frame)
2275 {
2276   return sctp46_input_dispatcher (vm, node, from_frame, 1 /* is_ip4 */ );
2277 }
2278
2279 static uword
2280 sctp6_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2281                         vlib_frame_t * from_frame)
2282 {
2283   return sctp46_input_dispatcher (vm, node, from_frame, 0 /* is_ip4 */ );
2284 }
2285
2286 /* *INDENT-OFF* */
2287 VLIB_REGISTER_NODE (sctp4_input_node) =
2288 {
2289   .function = sctp4_input_dispatcher,
2290   .name = "sctp4-input",
2291   /* Takes a vector of packets. */
2292   .vector_size = sizeof (u32),
2293   .n_errors = SCTP_N_ERROR,
2294   .error_strings = sctp_error_strings,
2295   .n_next_nodes = SCTP_INPUT_N_NEXT,
2296   .next_nodes =
2297   {
2298 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2299     foreach_sctp4_input_next
2300 #undef _
2301   },
2302   .format_buffer = format_sctp_header,
2303   .format_trace = format_sctp_rx_trace,
2304 };
2305 /* *INDENT-ON* */
2306
2307 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_input_node, sctp4_input_dispatcher);
2308
2309 /* *INDENT-OFF* */
2310 VLIB_REGISTER_NODE (sctp6_input_node) =
2311 {
2312   .function = sctp6_input_dispatcher,
2313   .name = "sctp6-input",
2314   /* Takes a vector of packets. */
2315   .vector_size = sizeof (u32),
2316   .n_errors = SCTP_N_ERROR,
2317   .error_strings = sctp_error_strings,
2318   .n_next_nodes = SCTP_INPUT_N_NEXT,
2319   .next_nodes =
2320   {
2321 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2322     foreach_sctp6_input_next
2323 #undef _
2324   },
2325   .format_buffer = format_sctp_header,
2326   .format_trace = format_sctp_rx_trace,
2327 };
2328 /* *INDENT-ON* */
2329
2330 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_input_node, sctp6_input_dispatcher);
2331
2332 vlib_node_registration_t sctp4_input_node;
2333 vlib_node_registration_t sctp6_input_node;
2334
2335 static void
2336 sctp_dispatch_table_init (sctp_main_t * tm)
2337 {
2338   int i, j;
2339   for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
2340     for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
2341       {
2342         tm->dispatch_table[i][j].next = SCTP_INPUT_NEXT_DROP;
2343         tm->dispatch_table[i][j].error = SCTP_ERROR_DISPATCH;
2344       }
2345
2346 #define _(t,f,n,e)                                              \
2347 do {                                                            \
2348     tm->dispatch_table[SCTP_STATE_##t][f].next = (n);           \
2349     tm->dispatch_table[SCTP_STATE_##t][f].error = (e);          \
2350 } while (0)
2351
2352   /*
2353    * SCTP STATE-MACHINE states:
2354    *
2355    * _(CLOSED, "CLOSED")                         \
2356    * _(COOKIE_WAIT, "COOKIE_WAIT")               \
2357    * _(COOKIE_ECHOED, "COOKIE_ECHOED")           \
2358    * _(ESTABLISHED, "ESTABLISHED")               \
2359    * _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING")     \
2360    * _(SHUTDOWN_SENT, "SHUTDOWN_SENT")           \
2361    * _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED")   \
2362    * _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
2363    */
2364   //_(CLOSED, DATA, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED DATA chunk which requires special handling */
2365   _(CLOSED, INIT, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2366   _(CLOSED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);        /* UNEXPECTED INIT_ACK chunk */
2367   _(CLOSED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);       /* UNEXPECTED SACK chunk */
2368   _(CLOSED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT chunk */
2369   _(CLOSED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT_ACK chunk */
2370   _(CLOSED, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2371   _(CLOSED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN chunk */
2372   _(CLOSED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN_ACK chunk */
2373   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);       /* UNEXPECTED OPERATION_ERROR chunk */
2374   _(CLOSED, COOKIE_ECHO, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2375   _(CLOSED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED COOKIE_ACK chunk */
2376   _(CLOSED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);     /* UNEXPECTED ECNE chunk */
2377   _(CLOSED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);       /* UNEXPECTED CWR chunk */
2378   _(CLOSED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);   /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2379   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2380
2381   _(COOKIE_WAIT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);  /* UNEXPECTED DATA chunk which requires special handling */
2382   _(COOKIE_WAIT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED INIT chunk which requires special handling */
2383   _(COOKIE_WAIT, INIT_ACK, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2384   _(COOKIE_WAIT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);  /* UNEXPECTED SACK chunk */
2385   _(COOKIE_WAIT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT chunk */
2386   _(COOKIE_WAIT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT_ACK chunk */
2387   _(COOKIE_WAIT, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2388   _(COOKIE_WAIT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN chunk */
2389   _(COOKIE_WAIT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2390   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2391   _(COOKIE_WAIT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2392   _(COOKIE_WAIT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2393   _(COOKIE_WAIT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2394   _(COOKIE_WAIT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2395   _(COOKIE_WAIT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2396   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2397     SCTP_ERROR_NONE);
2398
2399   _(COOKIE_ECHOED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2400   _(COOKIE_ECHOED, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);   /* UNEXPECTED INIT chunk which requires special handling */
2401   _(COOKIE_ECHOED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2402   _(COOKIE_ECHOED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2403   _(COOKIE_ECHOED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2404   _(COOKIE_ECHOED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2405   _(COOKIE_ECHOED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2406   _(COOKIE_ECHOED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN chunk */
2407   _(COOKIE_ECHOED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN_ACK chunk */
2408   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);        /* UNEXPECTED OPERATION_ERROR chunk */
2409   _(COOKIE_ECHOED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2410   _(COOKIE_ECHOED, COOKIE_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2411     SCTP_ERROR_NONE);
2412   _(COOKIE_ECHOED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2413   _(COOKIE_ECHOED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2414   _(COOKIE_ECHOED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2415   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2416     SCTP_ERROR_NONE);
2417
2418   _(ESTABLISHED, DATA, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2419   _(ESTABLISHED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);  /* UNEXPECTED INIT chunk */
2420   _(ESTABLISHED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED INIT_ACK chunk */
2421   _(ESTABLISHED, SACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2422   _(ESTABLISHED, HEARTBEAT, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2423     SCTP_ERROR_NONE);
2424   _(ESTABLISHED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2425     SCTP_ERROR_NONE);
2426   _(ESTABLISHED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);        /* UNEXPECTED ABORT chunk */
2427   _(ESTABLISHED, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2428   _(ESTABLISHED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2429   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2430   _(ESTABLISHED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2431   _(ESTABLISHED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2432   _(ESTABLISHED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2433   _(ESTABLISHED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2434   _(ESTABLISHED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2435   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2436     SCTP_ERROR_NONE);
2437
2438   _(SHUTDOWN_PENDING, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2439   _(SHUTDOWN_PENDING, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);     /* UNEXPECTED INIT chunk */
2440   _(SHUTDOWN_PENDING, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED INIT_ACK chunk */
2441   _(SHUTDOWN_PENDING, SACK, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2442   _(SHUTDOWN_PENDING, HEARTBEAT, SCTP_INPUT_NEXT_LISTEN_PHASE,
2443     SCTP_ERROR_NONE);
2444   _(SHUTDOWN_PENDING, HEARTBEAT_ACK, SCTP_INPUT_NEXT_LISTEN_PHASE,
2445     SCTP_ERROR_NONE);
2446   _(SHUTDOWN_PENDING, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);   /* UNEXPECTED ABORT chunk */
2447   _(SHUTDOWN_PENDING, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2448     SCTP_ERROR_NONE);
2449   _(SHUTDOWN_PENDING, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);     /* UNEXPECTED SHUTDOWN_ACK chunk */
2450   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);     /* UNEXPECTED OPERATION_ERROR chunk */
2451   _(SHUTDOWN_PENDING, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2452     SCTP_ERROR_NONE);
2453   _(SHUTDOWN_PENDING, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);    /* UNEXPECTED COOKIE_ACK chunk */
2454   _(SHUTDOWN_PENDING, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);   /* UNEXPECTED ECNE chunk */
2455   _(SHUTDOWN_PENDING, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);     /* UNEXPECTED CWR chunk */
2456   _(SHUTDOWN_PENDING, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION); /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2457   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2458     SCTP_ERROR_NONE);
2459
2460   _(SHUTDOWN_SENT, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2461   _(SHUTDOWN_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);        /* UNEXPECTED INIT chunk */
2462   _(SHUTDOWN_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2463   _(SHUTDOWN_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2464   _(SHUTDOWN_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2465   _(SHUTDOWN_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2466   _(SHUTDOWN_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2467   _(SHUTDOWN_SENT, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2468   _(SHUTDOWN_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2469     SCTP_ERROR_NONE);
2470   _(SHUTDOWN_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2471     SCTP_ERROR_NONE);
2472   _(SHUTDOWN_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);       /* UNEXPECTED COOKIE_ACK chunk */
2473   _(SHUTDOWN_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2474   _(SHUTDOWN_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2475   _(SHUTDOWN_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2476   _(SHUTDOWN_SENT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2477     SCTP_ERROR_NONE);
2478
2479   _(SHUTDOWN_RECEIVED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2480   _(SHUTDOWN_RECEIVED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2481   _(SHUTDOWN_RECEIVED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2482   _(SHUTDOWN_RECEIVED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2483   _(SHUTDOWN_RECEIVED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2484   _(SHUTDOWN_RECEIVED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2485   _(SHUTDOWN_RECEIVED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2486   _(SHUTDOWN_RECEIVED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2487   _(SHUTDOWN_RECEIVED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2488     SCTP_ERROR_NONE);
2489   _(SHUTDOWN_RECEIVED, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2490     SCTP_ERROR_NONE);
2491   _(SHUTDOWN_RECEIVED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2492   _(SHUTDOWN_RECEIVED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2493   _(SHUTDOWN_RECEIVED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2494   _(SHUTDOWN_RECEIVED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);        /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2495   _(SHUTDOWN_RECEIVED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2496     SCTP_ERROR_NONE);
2497
2498   _(SHUTDOWN_ACK_SENT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2499   _(SHUTDOWN_ACK_SENT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);       /* UNEXPECTED INIT chunk */
2500   _(SHUTDOWN_ACK_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2501   _(SHUTDOWN_ACK_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2502   _(SHUTDOWN_ACK_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2503   _(SHUTDOWN_ACK_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2504   _(SHUTDOWN_ACK_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2505   _(SHUTDOWN_ACK_SENT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2506   _(SHUTDOWN_ACK_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN_ACK chunk */
2507   _(SHUTDOWN_ACK_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2508     SCTP_ERROR_NONE);
2509   _(SHUTDOWN_ACK_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2510   _(SHUTDOWN_ACK_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2511   _(SHUTDOWN_ACK_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2512   _(SHUTDOWN_ACK_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2513     SCTP_ERROR_NONE);
2514   _(SHUTDOWN_ACK_SENT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2515     SCTP_ERROR_NONE);
2516
2517   /* TODO: Handle COOKIE ECHO when a TCB Exists */
2518
2519 #undef _
2520 }
2521
2522 clib_error_t *
2523 sctp_input_init (vlib_main_t * vm)
2524 {
2525   clib_error_t *error = 0;
2526   sctp_main_t *tm = vnet_get_sctp_main ();
2527
2528   if ((error = vlib_call_init_function (vm, sctp_init)))
2529     return error;
2530
2531   /* Initialize dispatch table. */
2532   sctp_dispatch_table_init (tm);
2533
2534   return error;
2535 }
2536
2537 VLIB_INIT_FUNCTION (sctp_input_init);
2538
2539 /*
2540  * fd.io coding-style-patch-verification: ON
2541  *
2542  * Local Variables:
2543  * eval: (c-set-style "gnu")
2544  * End:
2545  */