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   u32 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   u32 creation_time =
 868     clib_net_to_host_u32 (cookie_echo->cookie.creation_time);
 869   u32 cookie_lifespan =
 870     clib_net_to_host_u32 (cookie_echo->cookie.cookie_lifespan);
 871   if (now > creation_time + cookie_lifespan)
 872     {
 873       SCTP_DBG ("now (%u) > creation_time (%u) + cookie_lifespan (%u)",
 874                 now, creation_time, cookie_lifespan);
 875       return SCTP_ERROR_COOKIE_ECHO_VIOLATION;
 876     }
 877
 878   sctp_prepare_cookie_ack_chunk (sctp_conn, idx, b0);
 879
 880   /* Change state */
 881   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 882   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 883   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 884
 885   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 886                   sctp_conn->sub_conn[idx].RTO);
 887
 888   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 889
 890   return SCTP_ERROR_NONE;
 891
 892 }
 893
 894 always_inline u16
 895 sctp_handle_cookie_ack (sctp_header_t * sctp_hdr,
 896                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 897                         sctp_connection_t * sctp_conn, u8 idx,
 898                         vlib_buffer_t * b0, u16 * next0)
 899 {
 900   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 901   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 902     {
 903       return SCTP_ERROR_INVALID_TAG;
 904     }
 905
 906   sctp_calculate_rto (sctp_conn, idx);
 907
 908   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_COOKIE);
 909   /* Change state */
 910   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 911   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 912
 913   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 914
 915   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 916                   sctp_conn->sub_conn[idx].RTO);
 917
 918   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 919
 920   return SCTP_ERROR_NONE;
 921
 922 }
 923
 924 always_inline uword
 925 sctp46_rcv_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 926                          vlib_frame_t * from_frame, int is_ip4)
 927 {
 928   sctp_main_t *tm = vnet_get_sctp_main ();
 929
 930   u32 n_left_from, next_index, *from, *to_next;
 931   u32 my_thread_index = vm->thread_index;
 932
 933   from = vlib_frame_vector_args (from_frame);
 934   n_left_from = from_frame->n_vectors;
 935
 936   next_index = node->cached_next_index;
 937
 938   while (n_left_from > 0)
 939     {
 940       u32 n_left_to_next;
 941
 942       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 943
 944       while (n_left_from > 0 && n_left_to_next > 0)
 945         {
 946           u32 bi0;
 947           vlib_buffer_t *b0;
 948           sctp_header_t *sctp_hdr = 0;
 949           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
 950           ip4_header_t *ip4_hdr = 0;
 951           ip6_header_t *ip6_hdr = 0;
 952           sctp_connection_t *sctp_conn, *new_sctp_conn;
 953           u16 sctp_implied_length = 0;
 954           u16 error0 = SCTP_ERROR_NONE, next0 = sctp_next_drop (is_ip4);
 955           u8 idx;
 956
 957           bi0 = from[0];
 958           to_next[0] = bi0;
 959           from += 1;
 960           to_next += 1;
 961           n_left_from -= 1;
 962           n_left_to_next -= 1;
 963
 964           b0 = vlib_get_buffer (vm, bi0);
 965
 966           /* If we are in SCTP_COOKIE_WAIT_STATE then the connection
 967            * will come from the half-open connections pool.
 968            */
 969           sctp_conn =
 970             sctp_half_open_connection_get (vnet_buffer (b0)->
 971                                            sctp.connection_index);
 972
 973           if (PREDICT_FALSE (sctp_conn == 0))
 974             {
 975               SCTP_ADV_DBG
 976                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
 977               error0 = SCTP_ERROR_INVALID_CONNECTION;
 978               goto drop;
 979             }
 980           if (is_ip4)
 981             {
 982               ip4_hdr = vlib_buffer_get_current (b0);
 983               sctp_hdr = ip4_next_header (ip4_hdr);
 984               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
 985             }
 986           else
 987             {
 988               ip6_hdr = vlib_buffer_get_current (b0);
 989               sctp_hdr = ip6_next_header (ip6_hdr);
 990               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
 991             }
 992
 993           sctp_conn->sub_conn[idx].subconn_idx = idx;
 994           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
 995
 996           sctp_chunk_hdr =
 997             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
 998
 999           sctp_implied_length =
1000             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1001
1002           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1003
1004           switch (chunk_type)
1005             {
1006             case INIT_ACK:
1007               error0 =
1008                 sctp_is_valid_init_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1009                                         b0, sctp_implied_length);
1010
1011               if (error0 == SCTP_ERROR_NONE)
1012                 {
1013                   pool_get (tm->connections[my_thread_index], new_sctp_conn);
1014                   clib_memcpy (new_sctp_conn, sctp_conn,
1015                                sizeof (*new_sctp_conn));
1016                   new_sctp_conn->sub_conn[idx].c_c_index =
1017                     new_sctp_conn - tm->connections[my_thread_index];
1018                   new_sctp_conn->sub_conn[idx].c_thread_index =
1019                     my_thread_index;
1020                   new_sctp_conn->sub_conn[idx].PMTU =
1021                     sctp_conn->sub_conn[idx].PMTU;
1022                   new_sctp_conn->sub_conn[idx].subconn_idx = idx;
1023
1024                   if (sctp_half_open_connection_cleanup (sctp_conn))
1025                     {
1026                       SCTP_DBG
1027                         ("Cannot cleanup half-open connection; not the owning thread");
1028                     }
1029
1030                   sctp_connection_timers_init (new_sctp_conn);
1031
1032                   sctp_init_cwnd (new_sctp_conn);
1033
1034                   error0 =
1035                     sctp_handle_init_ack (sctp_hdr, sctp_chunk_hdr,
1036                                           new_sctp_conn, idx, b0,
1037                                           sctp_implied_length);
1038
1039                   if (session_stream_connect_notify
1040                       (&new_sctp_conn->sub_conn[idx].connection, 0))
1041                     {
1042                       SCTP_DBG
1043                         ("conn_index = %u: session_stream_connect_notify error; cleaning up connection",
1044                          new_sctp_conn->sub_conn[idx].connection.c_index);
1045                       sctp_connection_cleanup (new_sctp_conn);
1046                       goto drop;
1047                     }
1048                   next0 = sctp_next_output (is_ip4);
1049                 }
1050               break;
1051
1052             case OPERATION_ERROR:
1053               error0 =
1054                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1055                                            &next0);
1056               break;
1057
1058               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1059                * are handled by the input-dispatcher function using the table-lookup
1060                * hence we should never get to the "default" case below.
1061                */
1062             default:
1063               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1064               next0 = sctp_next_drop (is_ip4);
1065               goto drop;
1066             }
1067
1068           if (error0 != SCTP_ERROR_NONE)
1069             {
1070               clib_warning ("error while parsing chunk");
1071               sctp_connection_cleanup (sctp_conn);
1072               next0 = sctp_next_drop (is_ip4);
1073               goto drop;
1074             }
1075
1076         drop:
1077           b0->error = node->errors[error0];
1078           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1079             {
1080               sctp_rx_trace_t *t0 =
1081                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1082               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1083             }
1084
1085           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1086                                            n_left_to_next, bi0, next0);
1087         }
1088
1089       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1090     }
1091   return from_frame->n_vectors;
1092 }
1093
1094 static uword
1095 sctp4_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1096                  vlib_frame_t * from_frame)
1097 {
1098   return sctp46_rcv_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1099 }
1100
1101 static uword
1102 sctp6_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1103                  vlib_frame_t * from_frame)
1104 {
1105   return sctp46_rcv_phase_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1106 }
1107
1108 u8 *
1109 format_sctp_rx_trace_short (u8 * s, va_list * args)
1110 {
1111   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1112   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1113   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1114
1115   s = format (s, "%d -> %d (%U)",
1116               clib_net_to_host_u16 (t->sctp_header.src_port),
1117               clib_net_to_host_u16 (t->sctp_header.dst_port),
1118               format_sctp_state, t->sctp_connection.state);
1119
1120   return s;
1121 }
1122
1123 /* *INDENT-OFF* */
1124 VLIB_REGISTER_NODE (sctp4_rcv_phase_node) =
1125 {
1126   .function = sctp4_rcv_phase,
1127   .name = "sctp4-rcv",
1128   /* Takes a vector of packets. */
1129   .vector_size = sizeof (u32),
1130   .n_errors = SCTP_N_ERROR,
1131   .error_strings = sctp_error_strings,
1132   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1133   .next_nodes =
1134   {
1135 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1136     foreach_sctp_state_next
1137 #undef _
1138   },
1139   .format_trace = format_sctp_rx_trace_short,
1140 };
1141 /* *INDENT-ON* */
1142
1143 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_rcv_phase_node, sctp4_rcv_phase);
1144
1145 /* *INDENT-OFF* */
1146 VLIB_REGISTER_NODE (sctp6_init_phase_node) =
1147 {
1148   .function = sctp6_rcv_phase,
1149   .name = "sctp6-rcv",
1150   /* Takes a vector of packets. */
1151   .vector_size = sizeof (u32),
1152   .n_errors = SCTP_N_ERROR,
1153   .error_strings = sctp_error_strings,
1154   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1155   .next_nodes =
1156   {
1157 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1158     foreach_sctp_state_next
1159 #undef _
1160   },
1161   .format_trace = format_sctp_rx_trace_short,
1162 };
1163 /* *INDENT-ON* */
1164
1165 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_init_phase_node, sctp6_rcv_phase);
1166
1167 vlib_node_registration_t sctp4_shutdown_phase_node;
1168 vlib_node_registration_t sctp6_shutdown_phase_node;
1169
1170 always_inline u16
1171 sctp_handle_shutdown (sctp_header_t * sctp_hdr,
1172                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1173                       sctp_connection_t * sctp_conn, u8 idx,
1174                       vlib_buffer_t * b0, u16 sctp_implied_length,
1175                       u16 * next0)
1176 {
1177   sctp_shutdown_association_chunk_t *shutdown_chunk =
1178     (sctp_shutdown_association_chunk_t *) (sctp_hdr);
1179
1180   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1181   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1182     {
1183       return SCTP_ERROR_INVALID_TAG;
1184     }
1185
1186   /*
1187    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1188    */
1189   if (sctp_is_bundling (sctp_implied_length, &shutdown_chunk->chunk_hdr))
1190     return SCTP_ERROR_BUNDLING_VIOLATION;
1191
1192   switch (sctp_conn->state)
1193     {
1194     case SCTP_STATE_ESTABLISHED:
1195       if (sctp_check_outstanding_data_chunks (sctp_conn) == 0)
1196         sctp_conn->state = SCTP_STATE_SHUTDOWN_RECEIVED;
1197       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1198       break;
1199
1200     case SCTP_STATE_SHUTDOWN_SENT:
1201       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1202       break;
1203     }
1204
1205   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1206
1207   return SCTP_ERROR_NONE;
1208 }
1209
1210 always_inline u16
1211 sctp_handle_shutdown_ack (sctp_header_t * sctp_hdr,
1212                           sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1213                           sctp_connection_t * sctp_conn, u8 idx,
1214                           vlib_buffer_t * b0, u16 sctp_implied_length,
1215                           u16 * next0)
1216 {
1217   sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
1218     (sctp_shutdown_ack_chunk_t *) (sctp_hdr);
1219
1220   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1221   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1222     {
1223       return SCTP_ERROR_INVALID_TAG;
1224     }
1225
1226   /*
1227    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1228    */
1229   if (sctp_is_bundling (sctp_implied_length, &shutdown_ack_chunk->chunk_hdr))
1230     return SCTP_ERROR_BUNDLING_VIOLATION;
1231
1232   /* Whether we are in SCTP_STATE_SHUTDOWN_SENT or SCTP_STATE_SHUTDOWN_ACK_SENT
1233    * the reception of a SHUTDOWN_ACK chunk leads to the same actions:
1234    * - STOP T2_SHUTDOWN timer
1235    * - SEND SHUTDOWN_COMPLETE chunk
1236    */
1237   sctp_timer_reset (sctp_conn, SCTP_PRIMARY_PATH_IDX, SCTP_TIMER_T2_SHUTDOWN);
1238
1239   sctp_send_shutdown_complete (sctp_conn, idx, b0);
1240
1241   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1242
1243   return SCTP_ERROR_NONE;
1244 }
1245
1246 always_inline u16
1247 sctp_handle_shutdown_complete (sctp_header_t * sctp_hdr,
1248                                sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1249                                sctp_connection_t * sctp_conn, u8 idx,
1250                                vlib_buffer_t * b0, u16 sctp_implied_length,
1251                                u16 * next0)
1252 {
1253   sctp_shutdown_complete_chunk_t *shutdown_complete =
1254     (sctp_shutdown_complete_chunk_t *) (sctp_hdr);
1255
1256   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1257   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1258     {
1259       return SCTP_ERROR_INVALID_TAG;
1260     }
1261
1262   /*
1263    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1264    */
1265   if (sctp_is_bundling (sctp_implied_length, &shutdown_complete->chunk_hdr))
1266     return SCTP_ERROR_BUNDLING_VIOLATION;
1267
1268   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN);
1269
1270   stream_session_disconnect_notify (&sctp_conn->sub_conn[idx].connection);
1271
1272   sctp_conn->state = SCTP_STATE_CLOSED;
1273
1274   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1275
1276   return SCTP_ERROR_NONE;
1277 }
1278
1279 always_inline uword
1280 sctp46_shutdown_phase_inline (vlib_main_t * vm,
1281                               vlib_node_runtime_t * node,
1282                               vlib_frame_t * from_frame, int is_ip4)
1283 {
1284   u32 n_left_from, next_index, *from, *to_next;
1285   u32 my_thread_index = vm->thread_index;
1286
1287   from = vlib_frame_vector_args (from_frame);
1288   n_left_from = from_frame->n_vectors;
1289
1290   next_index = node->cached_next_index;
1291
1292   while (n_left_from > 0)
1293     {
1294       u32 n_left_to_next;
1295
1296       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1297
1298       while (n_left_from > 0 && n_left_to_next > 0)
1299         {
1300           u32 bi0;
1301           vlib_buffer_t *b0;
1302           sctp_rx_trace_t *sctp_trace;
1303           sctp_header_t *sctp_hdr = 0;
1304           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1305           ip4_header_t *ip4_hdr = 0;
1306           ip6_header_t *ip6_hdr = 0;
1307           sctp_connection_t *sctp_conn;
1308           u16 sctp_implied_length = 0;
1309           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
1310           u8 idx = 0;
1311
1312           bi0 = from[0];
1313           to_next[0] = bi0;
1314           from += 1;
1315           to_next += 1;
1316           n_left_from -= 1;
1317           n_left_to_next -= 1;
1318
1319           b0 = vlib_get_buffer (vm, bi0);
1320           sctp_conn =
1321             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1322                                  my_thread_index);
1323
1324           if (PREDICT_FALSE (sctp_conn == 0))
1325             {
1326               SCTP_DBG
1327                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1328               error0 = SCTP_ERROR_INVALID_CONNECTION;
1329               goto drop;
1330             }
1331
1332           if (is_ip4)
1333             {
1334               ip4_hdr = vlib_buffer_get_current (b0);
1335               sctp_hdr = ip4_next_header (ip4_hdr);
1336               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1337             }
1338           else
1339             {
1340               ip6_hdr = vlib_buffer_get_current (b0);
1341               sctp_hdr = ip6_next_header (ip6_hdr);
1342               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1343             }
1344
1345           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1346           sctp_chunk_hdr = &full_hdr->common_hdr;
1347
1348           sctp_implied_length =
1349             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1350
1351           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1352           switch (chunk_type)
1353             {
1354             case SHUTDOWN:
1355               error0 =
1356                 sctp_handle_shutdown (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1357                                       idx, b0, sctp_implied_length, &next0);
1358               break;
1359
1360             case SHUTDOWN_ACK:
1361               error0 =
1362                 sctp_handle_shutdown_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1363                                           idx, b0, sctp_implied_length,
1364                                           &next0);
1365               break;
1366
1367             case SHUTDOWN_COMPLETE:
1368               error0 =
1369                 sctp_handle_shutdown_complete (sctp_hdr, sctp_chunk_hdr,
1370                                                sctp_conn, idx, b0,
1371                                                sctp_implied_length, &next0);
1372
1373               sctp_connection_cleanup (sctp_conn);
1374               break;
1375
1376               /*
1377                * DATA chunks can still be transmitted/received in the SHUTDOWN-PENDING
1378                * and SHUTDOWN-SENT states (as per RFC4960 Section 6)
1379                */
1380             case DATA:
1381               error0 =
1382                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1383                                   sctp_conn, idx, b0, &next0);
1384               break;
1385
1386             case OPERATION_ERROR:
1387               error0 =
1388                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1389                                            &next0);
1390               break;
1391
1392             case COOKIE_ECHO:   /* Cookie Received While Shutting Down */
1393               sctp_prepare_operation_error (sctp_conn, idx, b0,
1394                                             COOKIE_RECEIVED_WHILE_SHUTTING_DOWN);
1395               error0 = SCTP_ERROR_NONE;
1396               next0 = sctp_next_output (is_ip4);
1397               break;
1398               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1399                * are handled by the input-dispatcher function using the table-lookup
1400                * hence we should never get to the "default" case below.
1401                */
1402             default:
1403               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1404               next0 = sctp_next_drop (is_ip4);
1405               goto drop;
1406             }
1407
1408           if (error0 != SCTP_ERROR_NONE)
1409             {
1410               clib_warning ("error while parsing chunk");
1411               sctp_connection_cleanup (sctp_conn);
1412               next0 = sctp_next_drop (is_ip4);
1413               goto drop;
1414             }
1415
1416         drop:
1417           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1418             {
1419               sctp_trace =
1420                 vlib_add_trace (vm, node, b0, sizeof (*sctp_trace));
1421
1422               if (sctp_hdr != NULL)
1423                 clib_memcpy (&sctp_trace->sctp_header, sctp_hdr,
1424                              sizeof (sctp_trace->sctp_header));
1425
1426               if (sctp_conn != NULL)
1427                 clib_memcpy (&sctp_trace->sctp_connection, sctp_conn,
1428                              sizeof (sctp_trace->sctp_connection));
1429             }
1430
1431           b0->error = node->errors[error0];
1432
1433           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1434                                            n_left_to_next, bi0, next0);
1435         }
1436
1437       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1438     }
1439
1440   return from_frame->n_vectors;
1441
1442 }
1443
1444 static uword
1445 sctp4_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1446                       vlib_frame_t * from_frame)
1447 {
1448   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1449 }
1450
1451 static uword
1452 sctp6_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1453                       vlib_frame_t * from_frame)
1454 {
1455   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1456 }
1457
1458 /* *INDENT-OFF* */
1459 VLIB_REGISTER_NODE (sctp4_shutdown_phase_node) =
1460 {
1461   .function = sctp4_shutdown_phase,
1462   .name = "sctp4-shutdown",
1463   /* Takes a vector of packets. */
1464   .vector_size = sizeof (u32),
1465   .n_errors = SCTP_N_ERROR,
1466   .error_strings = sctp_error_strings,
1467   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1468   .next_nodes =
1469   {
1470 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1471     foreach_sctp_state_next
1472 #undef _
1473   },
1474   .format_trace = format_sctp_rx_trace_short,
1475 };
1476 /* *INDENT-ON* */
1477
1478 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_shutdown_phase_node,
1479                               sctp4_shutdown_phase);
1480
1481 /* *INDENT-OFF* */
1482 VLIB_REGISTER_NODE (sctp6_shutdown_phase_node) =
1483 {
1484   .function = sctp6_shutdown_phase,
1485   .name = "sctp6-shutdown",
1486   /* Takes a vector of packets. */
1487   .vector_size = sizeof (u32),
1488   .n_errors = SCTP_N_ERROR,
1489   .error_strings = sctp_error_strings,
1490   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1491   .next_nodes =
1492   {
1493 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1494     foreach_sctp_state_next
1495 #undef _
1496   },
1497   .format_trace = format_sctp_rx_trace_short,
1498 };
1499 /* *INDENT-ON* */
1500
1501 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_shutdown_phase_node,
1502                               sctp6_shutdown_phase);
1503
1504 vlib_node_registration_t sctp4_listen_phase_node;
1505 vlib_node_registration_t sctp6_listen_phase_node;
1506
1507 vlib_node_registration_t sctp4_established_phase_node;
1508 vlib_node_registration_t sctp6_established_phase_node;
1509
1510 always_inline u16
1511 sctp_handle_sack (sctp_selective_ack_chunk_t * sack_chunk,
1512                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b0,
1513                   u16 * next0)
1514 {
1515
1516   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1517   if (sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag)
1518     {
1519       return SCTP_ERROR_INVALID_TAG;
1520     }
1521
1522   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_SACK_RECEIVED;
1523
1524   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1525
1526   /* Section 7.2.2; point (2) */
1527   if (sctp_conn->sub_conn[idx].cwnd > sctp_conn->sub_conn[idx].ssthresh)
1528     sctp_conn->sub_conn[idx].partially_acked_bytes =
1529       sctp_conn->next_tsn - sack_chunk->cumulative_tsn_ack;
1530
1531   /* Section 7.2.2; point (5) */
1532   if (sctp_conn->next_tsn - sack_chunk->cumulative_tsn_ack == 0)
1533     sctp_conn->sub_conn[idx].partially_acked_bytes = 0;
1534
1535   sctp_conn->last_unacked_tsn = sack_chunk->cumulative_tsn_ack;
1536
1537   sctp_calculate_rto (sctp_conn, idx);
1538
1539   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1540                      sctp_conn->sub_conn[idx].RTO);
1541
1542   sctp_conn->sub_conn[idx].RTO_pending = 0;
1543
1544   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1545
1546   return SCTP_ERROR_NONE;
1547 }
1548
1549 always_inline u16
1550 sctp_handle_heartbeat (sctp_hb_req_chunk_t * sctp_hb_chunk,
1551                        sctp_connection_t * sctp_conn, u8 idx,
1552                        vlib_buffer_t * b0, u16 * next0)
1553 {
1554   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1555   if (sctp_conn->local_tag != sctp_hb_chunk->sctp_hdr.verification_tag)
1556     {
1557       return SCTP_ERROR_INVALID_TAG;
1558     }
1559
1560   sctp_prepare_heartbeat_ack_chunk (sctp_conn, idx, b0);
1561
1562   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1563
1564   return SCTP_ERROR_NONE;
1565 }
1566
1567 always_inline u16
1568 sctp_handle_heartbeat_ack (sctp_hb_ack_chunk_t * sctp_hb_ack_chunk,
1569                            sctp_connection_t * sctp_conn, u8 idx,
1570                            vlib_buffer_t * b0, u16 * next0)
1571 {
1572   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1573
1574   sctp_conn->sub_conn[idx].unacknowledged_hb -= 1;
1575
1576   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
1577                      sctp_conn->sub_conn[idx].RTO);
1578
1579   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1580
1581   return SCTP_ERROR_NONE;
1582 }
1583
1584 always_inline void
1585 sctp_node_inc_counter (vlib_main_t * vm, u32 sctp4_node, u32 sctp6_node,
1586                        u8 is_ip4, u8 evt, u8 val)
1587 {
1588   if (PREDICT_TRUE (!val))
1589     return;
1590
1591   if (is_ip4)
1592     vlib_node_increment_counter (vm, sctp4_node, evt, val);
1593   else
1594     vlib_node_increment_counter (vm, sctp6_node, evt, val);
1595 }
1596
1597 always_inline uword
1598 sctp46_listen_process_inline (vlib_main_t * vm,
1599                               vlib_node_runtime_t * node,
1600                               vlib_frame_t * from_frame, int is_ip4)
1601 {
1602   u32 n_left_from, next_index, *from, *to_next;
1603   u32 my_thread_index = vm->thread_index;
1604
1605   from = vlib_frame_vector_args (from_frame);
1606   n_left_from = from_frame->n_vectors;
1607
1608   next_index = node->cached_next_index;
1609
1610   while (n_left_from > 0)
1611     {
1612       u32 n_left_to_next;
1613
1614       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1615
1616       while (n_left_from > 0 && n_left_to_next > 0)
1617         {
1618           u32 bi0;
1619           vlib_buffer_t *b0;
1620           sctp_header_t *sctp_hdr = 0;
1621           ip4_header_t *ip4_hdr;
1622           ip6_header_t *ip6_hdr;
1623           sctp_connection_t *child_conn;
1624           sctp_connection_t *sctp_listener;
1625           u16 next0 = sctp_next_drop (is_ip4), error0 = SCTP_ERROR_ENQUEUED;
1626
1627           bi0 = from[0];
1628           to_next[0] = bi0;
1629           from += 1;
1630           to_next += 1;
1631           n_left_from -= 1;
1632           n_left_to_next -= 1;
1633
1634           b0 = vlib_get_buffer (vm, bi0);
1635           sctp_listener =
1636             sctp_listener_get (vnet_buffer (b0)->sctp.connection_index);
1637
1638           if (is_ip4)
1639             {
1640               ip4_hdr = vlib_buffer_get_current (b0);
1641               sctp_hdr = ip4_next_header (ip4_hdr);
1642             }
1643           else
1644             {
1645               ip6_hdr = vlib_buffer_get_current (b0);
1646               sctp_hdr = ip6_next_header (ip6_hdr);
1647             }
1648
1649           child_conn =
1650             sctp_lookup_connection (sctp_listener->sub_conn
1651                                     [SCTP_PRIMARY_PATH_IDX].c_fib_index, b0,
1652                                     my_thread_index, is_ip4);
1653
1654           if (PREDICT_FALSE (child_conn->state != SCTP_STATE_CLOSED))
1655             {
1656               SCTP_DBG
1657                 ("conn_index = %u: child_conn->state != SCTP_STATE_CLOSED.... STATE=%s",
1658                  child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
1659                  connection.c_index,
1660                  sctp_state_to_string (child_conn->state));
1661               error0 = SCTP_ERROR_CREATE_EXISTS;
1662               goto drop;
1663             }
1664
1665           /* Create child session and send SYN-ACK */
1666           child_conn = sctp_connection_new (my_thread_index);
1667           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].subconn_idx =
1668             SCTP_PRIMARY_PATH_IDX;
1669           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_port =
1670             sctp_hdr->dst_port;
1671           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_port =
1672             sctp_hdr->src_port;
1673           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_is_ip4 = is_ip4;
1674           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.proto =
1675             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.proto;
1676           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU =
1677             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU;
1678           child_conn->state = SCTP_STATE_CLOSED;
1679           child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.fib_index =
1680             sctp_listener->sub_conn[SCTP_PRIMARY_PATH_IDX].
1681             connection.fib_index;
1682
1683           if (is_ip4)
1684             {
1685               child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_ip4.as_u32 =
1686                 ip4_hdr->dst_address.as_u32;
1687               child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_ip4.as_u32 =
1688                 ip4_hdr->src_address.as_u32;
1689             }
1690           else
1691             {
1692               clib_memcpy (&child_conn->
1693                            sub_conn[SCTP_PRIMARY_PATH_IDX].c_lcl_ip6,
1694                            &ip6_hdr->dst_address, sizeof (ip6_address_t));
1695               clib_memcpy (&child_conn->
1696                            sub_conn[SCTP_PRIMARY_PATH_IDX].c_rmt_ip6,
1697                            &ip6_hdr->src_address, sizeof (ip6_address_t));
1698             }
1699
1700           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1701           sctp_chunks_common_hdr_t *sctp_chunk_hdr = &full_hdr->common_hdr;
1702
1703           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1704           if (chunk_type != INIT && chunk_type != DATA
1705               && chunk_type != OPERATION_ERROR)
1706             {
1707               SCTP_DBG
1708                 ("conn_index = %u: chunk_type != INIT... chunk_type=%s",
1709                  child_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
1710                  connection.c_index, sctp_chunk_to_string (chunk_type));
1711
1712               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1713               next0 = sctp_next_drop (is_ip4);
1714               goto drop;
1715             }
1716
1717           u16 sctp_implied_length =
1718             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1719
1720           switch (chunk_type)
1721             {
1722             case INIT:
1723               sctp_connection_timers_init (child_conn);
1724
1725               sctp_init_snd_vars (child_conn);
1726
1727               sctp_init_cwnd (child_conn);
1728
1729               error0 =
1730                 sctp_handle_init (sctp_hdr, sctp_chunk_hdr, child_conn, b0,
1731                                   sctp_implied_length);
1732
1733               if (error0 == SCTP_ERROR_NONE)
1734                 {
1735                   if (stream_session_accept
1736                       (&child_conn->
1737                        sub_conn[SCTP_PRIMARY_PATH_IDX].connection,
1738                        sctp_listener->
1739                        sub_conn[SCTP_PRIMARY_PATH_IDX].c_s_index, 0))
1740                     {
1741                       clib_warning ("session accept fail");
1742                       sctp_connection_cleanup (child_conn);
1743                       error0 = SCTP_ERROR_CREATE_SESSION_FAIL;
1744                       goto drop;
1745                     }
1746                   next0 = sctp_next_output (is_ip4);
1747                 }
1748               break;
1749
1750               /* Reception of a DATA chunk whilst in the CLOSED state is called
1751                * "Out of the Blue" packet and handling of the chunk needs special treatment
1752                * as per RFC4960 section 8.4
1753                */
1754             case DATA:
1755               break;
1756
1757             case OPERATION_ERROR:
1758               error0 =
1759                 sctp_handle_operation_err (sctp_hdr, child_conn,
1760                                            SCTP_PRIMARY_PATH_IDX, b0, &next0);
1761               break;
1762             }
1763
1764         drop:
1765           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1766             {
1767               sctp_rx_trace_t *t0 =
1768                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1769               clib_memcpy (&t0->sctp_header, sctp_hdr,
1770                            sizeof (t0->sctp_header));
1771               clib_memcpy (&t0->sctp_connection, sctp_listener,
1772                            sizeof (t0->sctp_connection));
1773             }
1774
1775           b0->error = node->errors[error0];
1776
1777           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1778                                            n_left_to_next, bi0, next0);
1779         }
1780       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1781
1782     }
1783   return from_frame->n_vectors;
1784 }
1785
1786 static uword
1787 sctp4_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1788                     vlib_frame_t * from_frame)
1789 {
1790   return sctp46_listen_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1791 }
1792
1793 static uword
1794 sctp6_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1795                     vlib_frame_t * from_frame)
1796 {
1797   return sctp46_listen_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1798 }
1799
1800 always_inline uword
1801 sctp46_established_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1802                                  vlib_frame_t * from_frame, int is_ip4)
1803 {
1804   u32 n_left_from, next_index, *from, *to_next;
1805   u32 my_thread_index = vm->thread_index, errors = 0;
1806
1807   from = vlib_frame_vector_args (from_frame);
1808   n_left_from = from_frame->n_vectors;
1809
1810   next_index = node->cached_next_index;
1811
1812   while (n_left_from > 0)
1813     {
1814       u32 n_left_to_next;
1815
1816       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1817
1818       while (n_left_from > 0 && n_left_to_next > 0)
1819         {
1820           u32 bi0;
1821           vlib_buffer_t *b0;
1822           sctp_header_t *sctp_hdr = 0;
1823           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1824           ip4_header_t *ip4_hdr = 0;
1825           ip6_header_t *ip6_hdr = 0;
1826           sctp_connection_t *sctp_conn;
1827           u16 error0 = SCTP_ERROR_ENQUEUED, next0 =
1828             SCTP_ESTABLISHED_PHASE_N_NEXT;
1829           u8 idx;
1830
1831           bi0 = from[0];
1832           to_next[0] = bi0;
1833           from += 1;
1834           to_next += 1;
1835           n_left_from -= 1;
1836           n_left_to_next -= 1;
1837
1838           b0 = vlib_get_buffer (vm, bi0);
1839           sctp_conn =
1840             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1841                                  my_thread_index);
1842
1843           if (PREDICT_FALSE (sctp_conn == 0))
1844             {
1845               SCTP_DBG
1846                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1847               error0 = SCTP_ERROR_INVALID_CONNECTION;
1848               goto done;
1849             }
1850           if (is_ip4)
1851             {
1852               ip4_hdr = vlib_buffer_get_current (b0);
1853               sctp_hdr = ip4_next_header (ip4_hdr);
1854               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1855             }
1856           else
1857             {
1858               ip6_hdr = vlib_buffer_get_current (b0);
1859               sctp_hdr = ip6_next_header (ip6_hdr);
1860               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1861             }
1862
1863           sctp_conn->sub_conn[idx].subconn_idx = idx;
1864
1865           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1866           sctp_chunk_hdr =
1867             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
1868
1869           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1870
1871           switch (chunk_type)
1872             {
1873             case COOKIE_ECHO:
1874               error0 =
1875                 sctp_handle_cookie_echo (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1876                                          idx, b0, &next0);
1877               break;
1878
1879             case COOKIE_ACK:
1880               error0 =
1881                 sctp_handle_cookie_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1882                                         idx, b0, &next0);
1883               break;
1884
1885             case SACK:
1886               error0 =
1887                 sctp_handle_sack ((sctp_selective_ack_chunk_t *) sctp_hdr,
1888                                   sctp_conn, idx, b0, &next0);
1889               break;
1890
1891             case HEARTBEAT:
1892               error0 =
1893                 sctp_handle_heartbeat ((sctp_hb_req_chunk_t *) sctp_hdr,
1894                                        sctp_conn, idx, b0, &next0);
1895               break;
1896
1897             case HEARTBEAT_ACK:
1898               error0 =
1899                 sctp_handle_heartbeat_ack ((sctp_hb_ack_chunk_t *) sctp_hdr,
1900                                            sctp_conn, idx, b0, &next0);
1901               break;
1902
1903             case DATA:
1904               error0 =
1905                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1906                                   sctp_conn, idx, b0, &next0);
1907               break;
1908
1909             case OPERATION_ERROR:
1910               error0 =
1911                 sctp_handle_operation_err (sctp_hdr, sctp_conn, idx, b0,
1912                                            &next0);
1913               break;
1914
1915               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1916                * are handled by the input-dispatcher function using the table-lookup
1917                * hence we should never get to the "default" case below.
1918                */
1919             default:
1920               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
1921               next0 = sctp_next_drop (is_ip4);
1922               goto done;
1923             }
1924
1925         done:
1926           b0->error = node->errors[error0];
1927           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1928             {
1929               sctp_rx_trace_t *t0 =
1930                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1931               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1932             }
1933
1934           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1935                                            n_left_to_next, bi0, next0);
1936         }
1937
1938       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1939     }
1940
1941   errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_SCTP,
1942                                                  my_thread_index);
1943
1944   sctp_node_inc_counter (vm, is_ip4, sctp4_established_phase_node.index,
1945                          sctp6_established_phase_node.index,
1946                          SCTP_ERROR_EVENT_FIFO_FULL, errors);
1947   sctp_flush_frame_to_output (vm, my_thread_index, is_ip4);
1948
1949   return from_frame->n_vectors;
1950 }
1951
1952 static uword
1953 sctp4_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1954                          vlib_frame_t * from_frame)
1955 {
1956   return sctp46_established_phase_inline (vm, node, from_frame,
1957                                           1 /* is_ip4 */ );
1958 }
1959
1960 static uword
1961 sctp6_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1962                          vlib_frame_t * from_frame)
1963 {
1964   return sctp46_established_phase_inline (vm, node, from_frame,
1965                                           0 /* is_ip4 */ );
1966 }
1967
1968 u8 *
1969 format_sctp_rx_trace (u8 * s, va_list * args)
1970 {
1971   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1972   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1973   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1974   u32 indent = format_get_indent (s);
1975
1976   s = format (s, "%U\n%U%U",
1977               format_sctp_header, &t->sctp_header, 128,
1978               format_white_space, indent,
1979               format_sctp_connection, &t->sctp_connection, 1);
1980
1981   return s;
1982 }
1983
1984 /* *INDENT-OFF* */
1985 VLIB_REGISTER_NODE (sctp4_listen_phase_node) =
1986 {
1987   .function = sctp4_listen_phase,
1988   .name = "sctp4-listen",
1989   /* Takes a vector of packets. */
1990   .vector_size = sizeof (u32),
1991   .n_errors = SCTP_N_ERROR,
1992   .error_strings = sctp_error_strings,
1993   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1994   .next_nodes =
1995   {
1996 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1997     foreach_sctp_state_next
1998 #undef _
1999   },
2000   .format_trace = format_sctp_rx_trace_short,
2001 };
2002 /* *INDENT-ON* */
2003
2004 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_listen_phase_node, sctp4_listen_phase);
2005
2006 /* *INDENT-OFF* */
2007 VLIB_REGISTER_NODE (sctp6_listen_phase_node) =
2008 {
2009   .function = sctp6_listen_phase,
2010   .name = "sctp6-listen",
2011   /* Takes a vector of packets. */
2012   .vector_size = sizeof (u32),
2013   .n_errors = SCTP_N_ERROR,
2014   .error_strings = sctp_error_strings,
2015   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
2016   .next_nodes =
2017   {
2018 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
2019     foreach_sctp_state_next
2020 #undef _
2021   },
2022   .format_trace = format_sctp_rx_trace_short,
2023 };
2024 /* *INDENT-ON* */
2025
2026 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_listen_phase_node, sctp6_listen_phase);
2027
2028 /* *INDENT-OFF* */
2029 VLIB_REGISTER_NODE (sctp4_established_phase_node) =
2030 {
2031   .function = sctp4_established_phase,
2032   .name = "sctp4-established",
2033   /* Takes a vector of packets. */
2034   .vector_size = sizeof (u32),
2035   .n_errors = SCTP_N_ERROR,
2036   .error_strings = sctp_error_strings,
2037   .n_next_nodes = SCTP_ESTABLISHED_PHASE_N_NEXT,
2038   .next_nodes =
2039   {
2040 #define _(s,n) [SCTP_ESTABLISHED_PHASE_NEXT_##s] = n,
2041     foreach_sctp_state_next
2042 #undef _
2043   },
2044   .format_trace = format_sctp_rx_trace_short,
2045 };
2046 /* *INDENT-ON* */
2047
2048 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_established_phase_node,
2049                               sctp4_established_phase);
2050
2051 /* *INDENT-OFF* */
2052 VLIB_REGISTER_NODE (sctp6_established_phase_node) =
2053 {
2054   .function = sctp6_established_phase,
2055   .name = "sctp6-established",
2056   /* Takes a vector of packets. */
2057   .vector_size = sizeof (u32),
2058   .n_errors = SCTP_N_ERROR,
2059   .error_strings = sctp_error_strings,
2060   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
2061   .next_nodes =
2062   {
2063 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
2064     foreach_sctp_state_next
2065 #undef _
2066   },
2067   .format_trace = format_sctp_rx_trace_short,
2068 };
2069 /* *INDENT-ON* */
2070
2071 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_established_phase_node,
2072                               sctp6_established_phase);
2073
2074 /*
2075  * This is the function executed first for the SCTP graph.
2076  * It takes care of doing the initial message parsing and
2077  * dispatch to the specialized function.
2078  */
2079 always_inline uword
2080 sctp46_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2081                          vlib_frame_t * from_frame, int is_ip4)
2082 {
2083   u32 n_left_from, next_index, *from, *to_next;
2084   u32 my_thread_index = vm->thread_index;
2085   u8 is_filtered;
2086   sctp_main_t *tm = vnet_get_sctp_main ();
2087
2088   from = vlib_frame_vector_args (from_frame);
2089   n_left_from = from_frame->n_vectors;
2090   next_index = node->cached_next_index;
2091   sctp_set_time_now (my_thread_index);
2092
2093   while (n_left_from > 0)
2094     {
2095       u32 n_left_to_next;
2096
2097       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2098
2099       while (n_left_from > 0 && n_left_to_next > 0)
2100         {
2101           int n_advance_bytes0, n_data_bytes0;
2102           u32 bi0, fib_index0;
2103           vlib_buffer_t *b0;
2104           sctp_header_t *sctp_hdr = 0;
2105           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
2106           sctp_connection_t *sctp_conn;
2107           transport_connection_t *trans_conn;
2108           ip4_header_t *ip4_hdr;
2109           ip6_header_t *ip6_hdr;
2110           u32 error0 = SCTP_ERROR_NO_LISTENER, next0 = SCTP_INPUT_NEXT_DROP;
2111
2112           bi0 = from[0];
2113           to_next[0] = bi0;
2114           from += 1;
2115           to_next += 1;
2116           n_left_from -= 1;
2117           n_left_to_next -= 1;
2118
2119           b0 = vlib_get_buffer (vm, bi0);
2120           vnet_buffer (b0)->sctp.flags = 0;
2121           fib_index0 = vnet_buffer (b0)->ip.fib_index;
2122
2123           /* Checksum computed by ipx_local no need to compute again */
2124
2125           if (is_ip4)
2126             {
2127               ip4_hdr = vlib_buffer_get_current (b0);
2128               sctp_hdr = ip4_next_header (ip4_hdr);
2129
2130               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2131               sctp_chunk_hdr = &full_hdr->common_hdr;
2132
2133               n_advance_bytes0 =
2134                 (ip4_header_bytes (ip4_hdr) +
2135                  sizeof (sctp_payload_data_chunk_t));
2136               n_data_bytes0 =
2137                 clib_net_to_host_u16 (ip4_hdr->length) - n_advance_bytes0;
2138
2139               trans_conn = session_lookup_connection_wt4 (fib_index0,
2140                                                           &ip4_hdr->dst_address,
2141                                                           &ip4_hdr->src_address,
2142                                                           sctp_hdr->dst_port,
2143                                                           sctp_hdr->src_port,
2144                                                           TRANSPORT_PROTO_SCTP,
2145                                                           my_thread_index,
2146                                                           &is_filtered);
2147             }
2148           else
2149             {
2150               ip6_hdr = vlib_buffer_get_current (b0);
2151               sctp_hdr = ip6_next_header (ip6_hdr);
2152
2153               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2154               sctp_chunk_hdr = &full_hdr->common_hdr;
2155
2156               n_advance_bytes0 = sctp_header_bytes ();
2157               n_data_bytes0 =
2158                 clib_net_to_host_u16 (ip6_hdr->payload_length) -
2159                 n_advance_bytes0;
2160               n_advance_bytes0 += sizeof (ip6_hdr[0]);
2161
2162               trans_conn = session_lookup_connection_wt6 (fib_index0,
2163                                                           &ip6_hdr->dst_address,
2164                                                           &ip6_hdr->src_address,
2165                                                           sctp_hdr->dst_port,
2166                                                           sctp_hdr->src_port,
2167                                                           TRANSPORT_PROTO_SCTP,
2168                                                           my_thread_index,
2169                                                           &is_filtered);
2170             }
2171
2172           /* Length check */
2173           if (PREDICT_FALSE (n_advance_bytes0 < 0))
2174             {
2175               error0 = SCTP_ERROR_LENGTH;
2176               goto done;
2177             }
2178
2179           sctp_conn = sctp_get_connection_from_transport (trans_conn);
2180           vnet_sctp_common_hdr_params_net_to_host (sctp_chunk_hdr);
2181
2182           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
2183           if (chunk_type >= UNKNOWN)
2184             {
2185               clib_warning
2186                 ("Received an unrecognized chunk; sending back OPERATION_ERROR chunk");
2187
2188               sctp_prepare_operation_error (sctp_conn, SCTP_PRIMARY_PATH_IDX,
2189                                             b0, UNRECOGNIZED_CHUNK_TYPE);
2190
2191               error0 = SCTP_ERROR_UNKNOWN_CHUNK;
2192               next0 = sctp_next_output (is_ip4);
2193               goto done;
2194             }
2195
2196           vnet_buffer (b0)->sctp.hdr_offset =
2197             (u8 *) sctp_hdr - (u8 *) vlib_buffer_get_current (b0);
2198
2199           /* Session exists */
2200           if (PREDICT_TRUE (0 != sctp_conn))
2201             {
2202               /* Save connection index */
2203               vnet_buffer (b0)->sctp.connection_index = trans_conn->c_index;
2204               vnet_buffer (b0)->sctp.data_offset = n_advance_bytes0;
2205               vnet_buffer (b0)->sctp.data_len = n_data_bytes0;
2206
2207               next0 = tm->dispatch_table[sctp_conn->state][chunk_type].next;
2208               error0 = tm->dispatch_table[sctp_conn->state][chunk_type].error;
2209
2210               SCTP_DBG_STATE_MACHINE
2211                 ("S_INDEX = %u, C_INDEX = %u, TRANS_CONN = %p, SCTP_CONN = %p, CURRENT_CONNECTION_STATE = %s,"
2212                  "CHUNK_TYPE_RECEIVED = %s " "NEXT_PHASE = %s",
2213                  sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
2214                  connection.s_index,
2215                  sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].
2216                  connection.c_index, trans_conn, sctp_conn,
2217                  sctp_state_to_string (sctp_conn->state),
2218                  sctp_chunk_to_string (chunk_type), phase_to_string (next0));
2219
2220               if (chunk_type == DATA)
2221                 SCTP_ADV_DBG ("n_advance_bytes0 = %u, n_data_bytes0 = %u",
2222                               n_advance_bytes0, n_data_bytes0);
2223
2224             }
2225           else
2226             {
2227               if (is_filtered)
2228                 {
2229                   next0 = SCTP_INPUT_NEXT_DROP;
2230                   error0 = SCTP_ERROR_FILTERED;
2231                 }
2232               else if ((is_ip4 && tm->punt_unknown4) ||
2233                        (!is_ip4 && tm->punt_unknown6))
2234                 {
2235                   next0 = SCTP_INPUT_NEXT_PUNT_PHASE;
2236                   error0 = SCTP_ERROR_PUNT;
2237                 }
2238               else
2239                 {
2240                   next0 = SCTP_INPUT_NEXT_DROP;
2241                   error0 = SCTP_ERROR_NO_LISTENER;
2242                 }
2243               SCTP_DBG_STATE_MACHINE ("sctp_conn == NULL, NEXT_PHASE = %s",
2244                                       phase_to_string (next0));
2245               sctp_conn = 0;
2246             }
2247
2248         done:
2249           b0->error = error0 ? node->errors[error0] : 0;
2250
2251           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2252             {
2253               sctp_rx_trace_t *t0 =
2254                 vlib_add_trace (vm, node, b0, sizeof (*t0));
2255               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
2256             }
2257           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2258                                            n_left_to_next, bi0, next0);
2259         }
2260
2261       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2262     }
2263   return from_frame->n_vectors;
2264 }
2265
2266 static uword
2267 sctp4_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2268                         vlib_frame_t * from_frame)
2269 {
2270   return sctp46_input_dispatcher (vm, node, from_frame, 1 /* is_ip4 */ );
2271 }
2272
2273 static uword
2274 sctp6_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2275                         vlib_frame_t * from_frame)
2276 {
2277   return sctp46_input_dispatcher (vm, node, from_frame, 0 /* is_ip4 */ );
2278 }
2279
2280 /* *INDENT-OFF* */
2281 VLIB_REGISTER_NODE (sctp4_input_node) =
2282 {
2283   .function = sctp4_input_dispatcher,
2284   .name = "sctp4-input",
2285   /* Takes a vector of packets. */
2286   .vector_size = sizeof (u32),
2287   .n_errors = SCTP_N_ERROR,
2288   .error_strings = sctp_error_strings,
2289   .n_next_nodes = SCTP_INPUT_N_NEXT,
2290   .next_nodes =
2291   {
2292 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2293     foreach_sctp4_input_next
2294 #undef _
2295   },
2296   .format_buffer = format_sctp_header,
2297   .format_trace = format_sctp_rx_trace,
2298 };
2299 /* *INDENT-ON* */
2300
2301 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_input_node, sctp4_input_dispatcher);
2302
2303 /* *INDENT-OFF* */
2304 VLIB_REGISTER_NODE (sctp6_input_node) =
2305 {
2306   .function = sctp6_input_dispatcher,
2307   .name = "sctp6-input",
2308   /* Takes a vector of packets. */
2309   .vector_size = sizeof (u32),
2310   .n_errors = SCTP_N_ERROR,
2311   .error_strings = sctp_error_strings,
2312   .n_next_nodes = SCTP_INPUT_N_NEXT,
2313   .next_nodes =
2314   {
2315 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2316     foreach_sctp6_input_next
2317 #undef _
2318   },
2319   .format_buffer = format_sctp_header,
2320   .format_trace = format_sctp_rx_trace,
2321 };
2322 /* *INDENT-ON* */
2323
2324 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_input_node, sctp6_input_dispatcher);
2325
2326 vlib_node_registration_t sctp4_input_node;
2327 vlib_node_registration_t sctp6_input_node;
2328
2329 static void
2330 sctp_dispatch_table_init (sctp_main_t * tm)
2331 {
2332   int i, j;
2333   for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
2334     for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
2335       {
2336         tm->dispatch_table[i][j].next = SCTP_INPUT_NEXT_DROP;
2337         tm->dispatch_table[i][j].error = SCTP_ERROR_DISPATCH;
2338       }
2339
2340 #define _(t,f,n,e)                                              \
2341 do {                                                            \
2342     tm->dispatch_table[SCTP_STATE_##t][f].next = (n);           \
2343     tm->dispatch_table[SCTP_STATE_##t][f].error = (e);          \
2344 } while (0)
2345
2346   /*
2347    * SCTP STATE-MACHINE states:
2348    *
2349    * _(CLOSED, "CLOSED")                         \
2350    * _(COOKIE_WAIT, "COOKIE_WAIT")               \
2351    * _(COOKIE_ECHOED, "COOKIE_ECHOED")           \
2352    * _(ESTABLISHED, "ESTABLISHED")               \
2353    * _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING")     \
2354    * _(SHUTDOWN_SENT, "SHUTDOWN_SENT")           \
2355    * _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED")   \
2356    * _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
2357    */
2358   //_(CLOSED, DATA, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED DATA chunk which requires special handling */
2359   _(CLOSED, INIT, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2360   _(CLOSED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);        /* UNEXPECTED INIT_ACK chunk */
2361   _(CLOSED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);       /* UNEXPECTED SACK chunk */
2362   _(CLOSED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT chunk */
2363   _(CLOSED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT_ACK chunk */
2364   _(CLOSED, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2365   _(CLOSED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN chunk */
2366   _(CLOSED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN_ACK chunk */
2367   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);       /* UNEXPECTED OPERATION_ERROR chunk */
2368   _(CLOSED, COOKIE_ECHO, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2369   _(CLOSED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED COOKIE_ACK chunk */
2370   _(CLOSED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);     /* UNEXPECTED ECNE chunk */
2371   _(CLOSED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);       /* UNEXPECTED CWR chunk */
2372   _(CLOSED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);   /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2373   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2374
2375   _(COOKIE_WAIT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);  /* UNEXPECTED DATA chunk which requires special handling */
2376   _(COOKIE_WAIT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED INIT chunk which requires special handling */
2377   _(COOKIE_WAIT, INIT_ACK, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2378   _(COOKIE_WAIT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);  /* UNEXPECTED SACK chunk */
2379   _(COOKIE_WAIT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT chunk */
2380   _(COOKIE_WAIT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT_ACK chunk */
2381   _(COOKIE_WAIT, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2382   _(COOKIE_WAIT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN chunk */
2383   _(COOKIE_WAIT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2384   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2385   _(COOKIE_WAIT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2386   _(COOKIE_WAIT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2387   _(COOKIE_WAIT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2388   _(COOKIE_WAIT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2389   _(COOKIE_WAIT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2390   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2391     SCTP_ERROR_NONE);
2392
2393   _(COOKIE_ECHOED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2394   _(COOKIE_ECHOED, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);   /* UNEXPECTED INIT chunk which requires special handling */
2395   _(COOKIE_ECHOED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2396   _(COOKIE_ECHOED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2397   _(COOKIE_ECHOED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2398   _(COOKIE_ECHOED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2399   _(COOKIE_ECHOED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2400   _(COOKIE_ECHOED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN chunk */
2401   _(COOKIE_ECHOED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN_ACK chunk */
2402   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);        /* UNEXPECTED OPERATION_ERROR chunk */
2403   _(COOKIE_ECHOED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2404   _(COOKIE_ECHOED, COOKIE_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2405     SCTP_ERROR_NONE);
2406   _(COOKIE_ECHOED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2407   _(COOKIE_ECHOED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2408   _(COOKIE_ECHOED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2409   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2410     SCTP_ERROR_NONE);
2411
2412   _(ESTABLISHED, DATA, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2413   _(ESTABLISHED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);  /* UNEXPECTED INIT chunk */
2414   _(ESTABLISHED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED INIT_ACK chunk */
2415   _(ESTABLISHED, SACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2416   _(ESTABLISHED, HEARTBEAT, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2417     SCTP_ERROR_NONE);
2418   _(ESTABLISHED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2419     SCTP_ERROR_NONE);
2420   _(ESTABLISHED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);        /* UNEXPECTED ABORT chunk */
2421   _(ESTABLISHED, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2422   _(ESTABLISHED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2423   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2424   _(ESTABLISHED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2425   _(ESTABLISHED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2426   _(ESTABLISHED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2427   _(ESTABLISHED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2428   _(ESTABLISHED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2429   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2430     SCTP_ERROR_NONE);
2431
2432   _(SHUTDOWN_PENDING, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2433   _(SHUTDOWN_PENDING, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);     /* UNEXPECTED INIT chunk */
2434   _(SHUTDOWN_PENDING, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED INIT_ACK chunk */
2435   _(SHUTDOWN_PENDING, SACK, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2436   _(SHUTDOWN_PENDING, HEARTBEAT, SCTP_INPUT_NEXT_LISTEN_PHASE,
2437     SCTP_ERROR_NONE);
2438   _(SHUTDOWN_PENDING, HEARTBEAT_ACK, SCTP_INPUT_NEXT_LISTEN_PHASE,
2439     SCTP_ERROR_NONE);
2440   _(SHUTDOWN_PENDING, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);   /* UNEXPECTED ABORT chunk */
2441   _(SHUTDOWN_PENDING, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2442     SCTP_ERROR_NONE);
2443   _(SHUTDOWN_PENDING, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);     /* UNEXPECTED SHUTDOWN_ACK chunk */
2444   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);     /* UNEXPECTED OPERATION_ERROR chunk */
2445   _(SHUTDOWN_PENDING, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2446     SCTP_ERROR_NONE);
2447   _(SHUTDOWN_PENDING, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);    /* UNEXPECTED COOKIE_ACK chunk */
2448   _(SHUTDOWN_PENDING, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);   /* UNEXPECTED ECNE chunk */
2449   _(SHUTDOWN_PENDING, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);     /* UNEXPECTED CWR chunk */
2450   _(SHUTDOWN_PENDING, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION); /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2451   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2452     SCTP_ERROR_NONE);
2453
2454   _(SHUTDOWN_SENT, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2455   _(SHUTDOWN_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);        /* UNEXPECTED INIT chunk */
2456   _(SHUTDOWN_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2457   _(SHUTDOWN_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2458   _(SHUTDOWN_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2459   _(SHUTDOWN_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2460   _(SHUTDOWN_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2461   _(SHUTDOWN_SENT, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2462   _(SHUTDOWN_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2463     SCTP_ERROR_NONE);
2464   _(SHUTDOWN_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2465     SCTP_ERROR_NONE);
2466   _(SHUTDOWN_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);       /* UNEXPECTED COOKIE_ACK chunk */
2467   _(SHUTDOWN_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2468   _(SHUTDOWN_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2469   _(SHUTDOWN_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2470   _(SHUTDOWN_SENT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2471     SCTP_ERROR_NONE);
2472
2473   _(SHUTDOWN_RECEIVED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2474   _(SHUTDOWN_RECEIVED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2475   _(SHUTDOWN_RECEIVED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2476   _(SHUTDOWN_RECEIVED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2477   _(SHUTDOWN_RECEIVED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2478   _(SHUTDOWN_RECEIVED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2479   _(SHUTDOWN_RECEIVED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2480   _(SHUTDOWN_RECEIVED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2481   _(SHUTDOWN_RECEIVED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2482     SCTP_ERROR_NONE);
2483   _(SHUTDOWN_RECEIVED, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2484     SCTP_ERROR_NONE);
2485   _(SHUTDOWN_RECEIVED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2486   _(SHUTDOWN_RECEIVED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2487   _(SHUTDOWN_RECEIVED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2488   _(SHUTDOWN_RECEIVED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);        /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2489   _(SHUTDOWN_RECEIVED, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2490     SCTP_ERROR_NONE);
2491
2492   _(SHUTDOWN_ACK_SENT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2493   _(SHUTDOWN_ACK_SENT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);       /* UNEXPECTED INIT chunk */
2494   _(SHUTDOWN_ACK_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2495   _(SHUTDOWN_ACK_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2496   _(SHUTDOWN_ACK_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2497   _(SHUTDOWN_ACK_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2498   _(SHUTDOWN_ACK_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2499   _(SHUTDOWN_ACK_SENT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2500   _(SHUTDOWN_ACK_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN_ACK chunk */
2501   _(SHUTDOWN_ACK_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2502     SCTP_ERROR_NONE);
2503   _(SHUTDOWN_ACK_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2504   _(SHUTDOWN_ACK_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2505   _(SHUTDOWN_ACK_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2506   _(SHUTDOWN_ACK_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2507     SCTP_ERROR_NONE);
2508   _(SHUTDOWN_ACK_SENT, OPERATION_ERROR, SCTP_INPUT_NEXT_LISTEN_PHASE,
2509     SCTP_ERROR_NONE);
2510
2511   /* TODO: Handle COOKIE ECHO when a TCB Exists */
2512
2513 #undef _
2514 }
2515
2516 clib_error_t *
2517 sctp_input_init (vlib_main_t * vm)
2518 {
2519   clib_error_t *error = 0;
2520   sctp_main_t *tm = vnet_get_sctp_main ();
2521
2522   if ((error = vlib_call_init_function (vm, sctp_init)))
2523     return error;
2524
2525   /* Initialize dispatch table. */
2526   sctp_dispatch_table_init (tm);
2527
2528   return error;
2529 }
2530
2531 VLIB_INIT_FUNCTION (sctp_input_init);
2532
2533 /*
2534  * fd.io coding-style-patch-verification: ON
2535  *
2536  * Local Variables:
2537  * eval: (c-set-style "gnu")
2538  * End:
2539  */