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   _ (DROP, "error-drop")                        \
  31   _ (SCTP4_OUTPUT, "sctp4-output")                \
  32   _ (SCTP6_OUTPUT, "sctp6-output")
  33
  34 typedef enum _sctp_established_phase_next
  35 {
  36 #define _(s,n) SCTP_ESTABLISHED_PHASE_NEXT_##s,
  37   foreach_sctp_state_next
  38 #undef _
  39     SCTP_ESTABLISHED_PHASE_N_NEXT,
  40 } sctp_established_phase_next_t;
  41
  42 typedef enum _sctp_rcv_phase_next
  43 {
  44 #define _(s,n) SCTP_RCV_PHASE_NEXT_##s,
  45   foreach_sctp_state_next
  46 #undef _
  47     SCTP_RCV_PHASE_N_NEXT,
  48 } sctp_rcv_phase_next_t;
  49
  50 typedef enum _sctp_listen_phase_next
  51 {
  52 #define _(s,n) SCTP_LISTEN_PHASE_NEXT_##s,
  53   foreach_sctp_state_next
  54 #undef _
  55     SCTP_LISTEN_PHASE_N_NEXT,
  56 } sctp_listen_phase_next_t;
  57
  58 typedef enum _sctp_shutdown_phase_next
  59 {
  60 #define _(s,n) SCTP_SHUTDOWN_PHASE_NEXT_##s,
  61   foreach_sctp_state_next
  62 #undef _
  63     SCTP_SHUTDOWN_PHASE_N_NEXT,
  64 } sctp_shutdown_phase_next_t;
  65
  66 /* Generic, state independent indices */
  67 typedef enum _sctp_state_next
  68 {
  69 #define _(s,n) SCTP_NEXT_##s,
  70   foreach_sctp_state_next
  71 #undef _
  72     SCTP_STATE_N_NEXT,
  73 } sctp_state_next_t;
  74
  75 typedef enum _sctp_input_next
  76 {
  77   SCTP_INPUT_NEXT_DROP,
  78   SCTP_INPUT_NEXT_LISTEN_PHASE,
  79   SCTP_INPUT_NEXT_RCV_PHASE,
  80   SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
  81   SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
  82   SCTP_INPUT_NEXT_PUNT_PHASE,
  83   SCTP_INPUT_N_NEXT
  84 } sctp_input_next_t;
  85
  86 char *
  87 phase_to_string (u8 phase)
  88 {
  89   switch (phase)
  90     {
  91     case SCTP_INPUT_NEXT_DROP:
  92       return "SCTP_INPUT_NEXT_DROP";
  93     case SCTP_INPUT_NEXT_LISTEN_PHASE:
  94       return "SCTP_INPUT_NEXT_LISTEN_PHASE";
  95     case SCTP_INPUT_NEXT_RCV_PHASE:
  96       return "SCTP_INPUT_NEXT_RCV_PHASE";
  97     case SCTP_INPUT_NEXT_ESTABLISHED_PHASE:
  98       return "SCTP_INPUT_NEXT_ESTABLISHED_PHASE";
  99     case SCTP_INPUT_NEXT_SHUTDOWN_PHASE:
 100       return "SCTP_INPUT_NEXT_SHUTDOWN_PHASE";
 101     case SCTP_INPUT_NEXT_PUNT_PHASE:
 102       return "SCTP_INPUT_NEXT_PUNT_PHASE";
 103     }
 104   return NULL;
 105 }
 106
 107 #define foreach_sctp4_input_next                 \
 108   _ (DROP, "error-drop")                         \
 109   _ (RCV_PHASE, "sctp4-rcv")                    \
 110   _ (LISTEN_PHASE, "sctp4-listen")       \
 111   _ (ESTABLISHED_PHASE, "sctp4-established")             \
 112   _ (SHUTDOWN_PHASE, "sctp4-shutdown")  \
 113   _ (PUNT_PHASE, "ip4-punt")
 114
 115
 116 #define foreach_sctp6_input_next                 \
 117   _ (DROP, "error-drop")                         \
 118   _ (RCV_PHASE, "sctp6-rcv")                    \
 119   _ (LISTEN_PHASE, "sctp6-listen")       \
 120   _ (ESTABLISHED_PHASE, "sctp6-established")             \
 121   _ (SHUTDOWN_PHASE, "sctp6-shutdown")          \
 122   _ (PUNT_PHASE, "ip6-punt")
 123
 124 static u8
 125 sctp_lookup_is_valid (transport_connection_t * trans_conn,
 126                       sctp_header_t * sctp_hdr)
 127 {
 128   sctp_connection_t *sctp_conn =
 129     sctp_get_connection_from_transport (trans_conn);
 130
 131   if (!sctp_conn)
 132     return 1;
 133
 134   u8 is_valid = (trans_conn->lcl_port == sctp_hdr->dst_port
 135                  && (sctp_conn->state == SCTP_STATE_CLOSED
 136                      || trans_conn->rmt_port == sctp_hdr->src_port));
 137
 138   return is_valid;
 139 }
 140
 141 /**
 142  * Lookup transport connection
 143  */
 144 static sctp_connection_t *
 145 sctp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
 146                         u8 is_ip4)
 147 {
 148   sctp_main_t *tm = vnet_get_sctp_main ();
 149   sctp_header_t *sctp_hdr;
 150   transport_connection_t *trans_conn;
 151   sctp_connection_t *sctp_conn;
 152   u8 is_filtered, i;
 153   if (is_ip4)
 154     {
 155       ip4_header_t *ip4_hdr;
 156       ip4_hdr = vlib_buffer_get_current (b);
 157       sctp_hdr = ip4_next_header (ip4_hdr);
 158       trans_conn = session_lookup_connection_wt4 (fib_index,
 159                                                   &ip4_hdr->dst_address,
 160                                                   &ip4_hdr->src_address,
 161                                                   sctp_hdr->dst_port,
 162                                                   sctp_hdr->src_port,
 163                                                   TRANSPORT_PROTO_SCTP,
 164                                                   thread_index, &is_filtered);
 165       if (trans_conn == 0)      /* Not primary connection */
 166         {
 167           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 168             {
 169               if ((tm->connections[thread_index]->sub_conn[i].
 170                    connection.lcl_ip.ip4.as_u32 ==
 171                    ip4_hdr->dst_address.as_u32)
 172                   && (tm->connections[thread_index]->sub_conn[i].
 173                       connection.rmt_ip.ip4.as_u32 ==
 174                       ip4_hdr->src_address.as_u32))
 175                 {
 176                   trans_conn =
 177                     &tm->connections[thread_index]->sub_conn[i].connection;
 178                   break;
 179                 }
 180             }
 181         }
 182       ASSERT (trans_conn != 0);
 183       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 184     }
 185   else
 186     {
 187       ip6_header_t *ip6_hdr;
 188       ip6_hdr = vlib_buffer_get_current (b);
 189       sctp_hdr = ip6_next_header (ip6_hdr);
 190       trans_conn = session_lookup_connection_wt6 (fib_index,
 191                                                   &ip6_hdr->dst_address,
 192                                                   &ip6_hdr->src_address,
 193                                                   sctp_hdr->dst_port,
 194                                                   sctp_hdr->src_port,
 195                                                   TRANSPORT_PROTO_SCTP,
 196                                                   thread_index, &is_filtered);
 197       if (trans_conn == 0)      /* Not primary connection */
 198         {
 199           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 200             {
 201               if ((tm->connections[thread_index]->sub_conn[i].
 202                    connection.lcl_ip.ip6.as_u64[0] ==
 203                    ip6_hdr->dst_address.as_u64[0]
 204                    && tm->connections[thread_index]->sub_conn[i].
 205                    connection.lcl_ip.ip6.as_u64[1] ==
 206                    ip6_hdr->dst_address.as_u64[1])
 207                   && (tm->connections[thread_index]->sub_conn[i].
 208                       connection.rmt_ip.ip6.as_u64[0] ==
 209                       ip6_hdr->src_address.as_u64[0]
 210                       && tm->connections[thread_index]->
 211                       sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
 212                       ip6_hdr->src_address.as_u64[1]))
 213                 {
 214                   trans_conn =
 215                     &tm->connections[thread_index]->sub_conn[i].connection;
 216                   break;
 217                 }
 218             }
 219         }
 220       ASSERT (trans_conn != 0);
 221       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 222     }
 223   sctp_conn = sctp_get_connection_from_transport (trans_conn);
 224   return sctp_conn;
 225 }
 226
 227 typedef struct
 228 {
 229   sctp_header_t sctp_header;
 230   sctp_connection_t sctp_connection;
 231 } sctp_rx_trace_t;
 232
 233 #define sctp_next_output(is_ip4) (is_ip4 ? SCTP_NEXT_SCTP4_OUTPUT          \
 234                                         : SCTP_NEXT_SCTP6_OUTPUT)
 235
 236
 237 void
 238 sctp_set_rx_trace_data (sctp_rx_trace_t * rx_trace,
 239                         sctp_connection_t * sctp_conn,
 240                         sctp_header_t * sctp_hdr, vlib_buffer_t * b0,
 241                         u8 is_ip4)
 242 {
 243   if (sctp_conn)
 244     {
 245       clib_memcpy (&rx_trace->sctp_connection, sctp_conn,
 246                    sizeof (rx_trace->sctp_connection));
 247     }
 248   else
 249     {
 250       sctp_hdr = sctp_buffer_hdr (b0);
 251     }
 252   clib_memcpy (&rx_trace->sctp_header, sctp_hdr,
 253                sizeof (rx_trace->sctp_header));
 254 }
 255
 256 always_inline u16
 257 sctp_calculate_implied_length (ip4_header_t * ip4_hdr, ip6_header_t * ip6_hdr,
 258                                int is_ip4)
 259 {
 260   u16 sctp_implied_packet_length = 0;
 261
 262   if (is_ip4)
 263     sctp_implied_packet_length =
 264       clib_net_to_host_u16 (ip4_hdr->length) - ip4_header_bytes (ip4_hdr);
 265   else
 266     sctp_implied_packet_length =
 267       clib_net_to_host_u16 (ip6_hdr->payload_length) - sizeof (ip6_hdr);
 268
 269   return sctp_implied_packet_length;
 270 }
 271
 272 always_inline u8
 273 sctp_is_bundling (u16 sctp_implied_length,
 274                   sctp_chunks_common_hdr_t * sctp_common_hdr)
 275 {
 276   if (sctp_implied_length !=
 277       sizeof (sctp_header_t) + vnet_sctp_get_chunk_length (sctp_common_hdr))
 278     return 1;
 279   return 0;
 280 }
 281
 282 always_inline u16
 283 sctp_handle_init (sctp_header_t * sctp_hdr,
 284                   sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 285                   sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 286                   u16 sctp_implied_length)
 287 {
 288   sctp_init_chunk_t *init_chunk = (sctp_init_chunk_t *) (sctp_hdr);
 289   ip4_address_t *ip4_addr = 0;
 290   ip6_address_t *ip6_addr = 0;
 291   char hostname[FQDN_MAX_LENGTH];
 292
 293   /* Check the current state of the connection
 294    *
 295    * The logic required by the RFC4960 Section 5.2.2 is already taken care of
 296    * in the code below and by the "sctp_prepare_initack_chunk" function.
 297    * However, for debugging purposes it is nice to have a message printed out
 298    * for these corner-case scenarios.
 299    */
 300   if (sctp_conn->state != SCTP_STATE_CLOSED)
 301     {                           /* UNEXPECTED scenario */
 302       switch (sctp_conn->state)
 303         {
 304         case SCTP_STATE_COOKIE_WAIT:    /* TODO */
 305           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_WAIT state");
 306           break;
 307         case SCTP_STATE_COOKIE_ECHOED:  /* TODO */
 308           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_ECHOED state");
 309           break;
 310         }
 311     }
 312
 313   if (sctp_hdr->verification_tag != 0x0)
 314     return SCTP_ERROR_INVALID_TAG_FOR_INIT;
 315
 316   /*
 317    * It is not possible to bundle any other CHUNK with the INIT chunk
 318    */
 319   if (sctp_is_bundling (sctp_implied_length, &init_chunk->chunk_hdr))
 320     return SCTP_ERROR_BUNDLING_VIOLATION;
 321
 322   /* Save the INITIATE_TAG of the remote peer for this connection:
 323    * it MUST be used for the VERIFICATION_TAG parameter in the SCTP HEADER */
 324   sctp_conn->remote_tag = init_chunk->initiate_tag;
 325   sctp_conn->remote_initial_tsn =
 326     clib_net_to_host_u32 (init_chunk->initial_tsn);
 327   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 328   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 329   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 330                           sctp_conn->remote_initial_tsn);
 331
 332   sctp_conn->snd_opts.a_rwnd = clib_net_to_host_u32 (init_chunk->a_rwnd);
 333
 334   /*
 335    * If the length specified in the INIT message is bigger than the size in bytes of our structure it means that
 336    * optional parameters have been sent with the INIT chunk and we need to parse them.
 337    */
 338   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 339   if (length > sizeof (sctp_init_chunk_t))
 340     {
 341       /* There are optional parameters in the INIT chunk */
 342       u16 pointer_offset = sizeof (sctp_init_chunk_t);
 343       while (pointer_offset < length)
 344         {
 345           sctp_opt_params_hdr_t *opt_params_hdr =
 346             (sctp_opt_params_hdr_t *) init_chunk + pointer_offset;
 347
 348           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 349             {
 350             case SCTP_IPV4_ADDRESS_TYPE:
 351               {
 352                 sctp_ipv4_addr_param_t *ipv4 =
 353                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 354                 clib_memcpy (ip4_addr, &ipv4->address,
 355                              sizeof (ip4_address_t));
 356
 357                 sctp_sub_connection_add_ip4 (vlib_get_thread_index (), ipv4);
 358
 359                 break;
 360               }
 361             case SCTP_IPV6_ADDRESS_TYPE:
 362               {
 363                 sctp_ipv6_addr_param_t *ipv6 =
 364                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 365                 clib_memcpy (ip6_addr, &ipv6->address,
 366                              sizeof (ip6_address_t));
 367
 368                 sctp_sub_connection_add_ip6 (vlib_get_thread_index (), ipv6);
 369
 370                 break;
 371               }
 372             case SCTP_COOKIE_PRESERVATIVE_TYPE:
 373               {
 374                 sctp_cookie_preservative_param_t *cookie_pres =
 375                   (sctp_cookie_preservative_param_t *) opt_params_hdr;
 376                 sctp_conn->peer_cookie_life_span_increment =
 377                   cookie_pres->life_span_inc;
 378                 break;
 379               }
 380             case SCTP_HOSTNAME_ADDRESS_TYPE:
 381               {
 382                 sctp_hostname_param_t *hostname_addr =
 383                   (sctp_hostname_param_t *) opt_params_hdr;
 384                 clib_memcpy (hostname, hostname_addr->hostname,
 385                              FQDN_MAX_LENGTH);
 386                 break;
 387               }
 388             case SCTP_SUPPORTED_ADDRESS_TYPES:
 389               {
 390                 /* TODO */
 391                 break;
 392               }
 393             }
 394           pointer_offset += clib_net_to_host_u16 (opt_params_hdr->length);
 395         }
 396     }
 397
 398   /* Reuse buffer to make init-ack and send */
 399   sctp_prepare_initack_chunk (sctp_conn, b0, ip4_addr, ip6_addr);
 400   return SCTP_ERROR_NONE;
 401 }
 402
 403 always_inline u16
 404 sctp_is_valid_init_ack (sctp_header_t * sctp_hdr,
 405                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 406                         sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 407                         u16 sctp_implied_length)
 408 {
 409   sctp_init_ack_chunk_t *init_ack_chunk =
 410     (sctp_init_ack_chunk_t *) (sctp_hdr);
 411
 412   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 413   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 414     {
 415       return SCTP_ERROR_INVALID_TAG;
 416     }
 417
 418   /*
 419    * It is not possible to bundle any other CHUNK with the INIT_ACK chunk
 420    */
 421   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 422     return SCTP_ERROR_BUNDLING_VIOLATION;
 423
 424   return SCTP_ERROR_NONE;
 425 }
 426
 427 always_inline u16
 428 sctp_handle_init_ack (sctp_header_t * sctp_hdr,
 429                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 430                       sctp_connection_t * sctp_conn, u8 idx,
 431                       vlib_buffer_t * b0, u16 sctp_implied_length)
 432 {
 433   sctp_init_ack_chunk_t *init_ack_chunk =
 434     (sctp_init_ack_chunk_t *) (sctp_hdr);
 435   ip4_address_t *ip4_addr = 0;
 436   ip6_address_t *ip6_addr = 0;
 437   sctp_state_cookie_param_t state_cookie;
 438
 439   char hostname[FQDN_MAX_LENGTH];
 440
 441   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 442   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 443     {
 444       return SCTP_ERROR_INVALID_TAG;
 445     }
 446
 447   /*
 448    * It is not possible to bundle any other CHUNK with the INIT chunk
 449    */
 450   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 451     return SCTP_ERROR_BUNDLING_VIOLATION;
 452
 453   sctp_calculate_rto (sctp_conn, idx);
 454
 455   /* remote_tag to be placed in the VERIFICATION_TAG field of the COOKIE_ECHO chunk */
 456   sctp_conn->remote_tag = init_ack_chunk->initiate_tag;
 457   sctp_conn->remote_initial_tsn =
 458     clib_net_to_host_u32 (init_ack_chunk->initial_tsn);
 459   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 460   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 461   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 462                           sctp_conn->remote_initial_tsn);
 463   sctp_conn->snd_opts.a_rwnd = clib_net_to_host_u32 (init_ack_chunk->a_rwnd);
 464
 465   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 466
 467   if (length > sizeof (sctp_init_ack_chunk_t))
 468     /*
 469      * There are optional parameters in the INIT ACK chunk
 470      */
 471     {
 472       u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
 473
 474       while (pointer_offset < length)
 475         {
 476           sctp_opt_params_hdr_t *opt_params_hdr =
 477             (sctp_opt_params_hdr_t *) ((char *) init_ack_chunk +
 478                                        pointer_offset);
 479
 480           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 481             {
 482             case SCTP_IPV4_ADDRESS_TYPE:
 483               {
 484                 sctp_ipv4_addr_param_t *ipv4 =
 485                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 486                 clib_memcpy (ip4_addr, &ipv4->address,
 487                              sizeof (ip4_address_t));
 488
 489                 sctp_sub_connection_add_ip4 (vlib_get_thread_index (), ipv4);
 490
 491                 break;
 492               }
 493             case SCTP_IPV6_ADDRESS_TYPE:
 494               {
 495                 sctp_ipv6_addr_param_t *ipv6 =
 496                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 497                 clib_memcpy (ip6_addr, &ipv6->address,
 498                              sizeof (ip6_address_t));
 499
 500                 sctp_sub_connection_add_ip6 (vlib_get_thread_index (), ipv6);
 501
 502                 break;
 503               }
 504             case SCTP_STATE_COOKIE_TYPE:
 505               {
 506                 sctp_state_cookie_param_t *state_cookie_param =
 507                   (sctp_state_cookie_param_t *) opt_params_hdr;
 508
 509                 clib_memcpy (&state_cookie, state_cookie_param,
 510                              sizeof (sctp_state_cookie_param_t));
 511                 break;
 512               }
 513             case SCTP_HOSTNAME_ADDRESS_TYPE:
 514               {
 515                 sctp_hostname_param_t *hostname_addr =
 516                   (sctp_hostname_param_t *) opt_params_hdr;
 517                 clib_memcpy (hostname, hostname_addr->hostname,
 518                              FQDN_MAX_LENGTH);
 519                 break;
 520               }
 521             case SCTP_UNRECOGNIZED_TYPE:
 522               {
 523                 break;
 524               }
 525             }
 526           u16 increment = clib_net_to_host_u16 (opt_params_hdr->length);
 527           /* This indicates something really bad happened */
 528           if (increment == 0)
 529             {
 530               return SCTP_ERROR_INVALID_TAG;
 531             }
 532           pointer_offset += increment;
 533         }
 534     }
 535
 536   sctp_prepare_cookie_echo_chunk (sctp_conn, b0, &state_cookie);
 537
 538   /* Start the T1_COOKIE timer */
 539   sctp_timer_set (sctp_conn, sctp_pick_conn_idx_on_chunk (COOKIE_ECHO),
 540                   SCTP_TIMER_T1_COOKIE, sctp_conn->sub_conn[idx].RTO);
 541
 542   return SCTP_ERROR_NONE;
 543 }
 544
 545 /** Enqueue data out-of-order for delivery to application */
 546 always_inline int
 547 sctp_session_enqueue_data_ooo (sctp_connection_t * sctp_conn,
 548                                vlib_buffer_t * b, u16 data_len, u8 conn_idx)
 549 {
 550   int written, error = SCTP_ERROR_ENQUEUED;
 551
 552   written =
 553     session_enqueue_stream_connection (&sctp_conn->
 554                                        sub_conn[conn_idx].connection, b, 0,
 555                                        1 /* queue event */ ,
 556                                        0);
 557
 558   /* Update next_tsn_expected */
 559   if (PREDICT_TRUE (written == data_len))
 560     {
 561       sctp_conn->next_tsn_expected += written;
 562
 563       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 564                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 565                     written, data_len);
 566     }
 567   /* If more data written than expected, account for out-of-order bytes. */
 568   else if (written > data_len)
 569     {
 570       sctp_conn->next_tsn_expected += written;
 571
 572       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 573                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 574                     written, data_len);
 575     }
 576   else if (written > 0)
 577     {
 578       /* We've written something but FIFO is probably full now */
 579       sctp_conn->next_tsn_expected += written;
 580
 581       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 582
 583       SCTP_ADV_DBG
 584         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 585          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 586     }
 587   else
 588     {
 589       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 590                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 591
 592       return SCTP_ERROR_FIFO_FULL;
 593     }
 594
 595   /* TODO: Update out_of_order_map & SACK list */
 596
 597   return error;
 598 }
 599
 600 /** Enqueue data for delivery to application */
 601 always_inline int
 602 sctp_session_enqueue_data (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
 603                            u16 data_len, u8 conn_idx)
 604 {
 605   int written, error = SCTP_ERROR_ENQUEUED;
 606
 607   written =
 608     session_enqueue_stream_connection (&sctp_conn->
 609                                        sub_conn[conn_idx].connection, b, 0,
 610                                        1 /* queue event */ ,
 611                                        1);
 612
 613   /* Update next_tsn_expected */
 614   if (PREDICT_TRUE (written == data_len))
 615     {
 616       sctp_conn->next_tsn_expected += written;
 617
 618       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 619                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 620                     written, data_len);
 621     }
 622   /* If more data written than expected, account for out-of-order bytes. */
 623   else if (written > data_len)
 624     {
 625       sctp_conn->next_tsn_expected += written;
 626
 627       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 628                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 629                     written, data_len);
 630     }
 631   else if (written > 0)
 632     {
 633       /* We've written something but FIFO is probably full now */
 634       sctp_conn->next_tsn_expected += written;
 635
 636       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 637
 638       SCTP_ADV_DBG
 639         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 640          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 641     }
 642   else
 643     {
 644       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 645                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 646
 647       return SCTP_ERROR_FIFO_FULL;
 648     }
 649
 650   return error;
 651 }
 652
 653 always_inline u8
 654 sctp_is_sack_delayable (sctp_connection_t * sctp_conn, u8 gapping)
 655 {
 656   if (gapping != 0)
 657     {
 658       SCTP_CONN_TRACKING_DBG
 659         ("gapping != 0: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 660          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 661       return 1;
 662     }
 663
 664   if (sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS)
 665     {
 666       SCTP_CONN_TRACKING_DBG
 667         ("sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 668          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 669       return 1;
 670     }
 671
 672   sctp_conn->ack_state += 1;
 673
 674   return 0;
 675 }
 676
 677 always_inline void
 678 sctp_is_connection_gapping (sctp_connection_t * sctp_conn, u32 tsn,
 679                             u8 * gapping)
 680 {
 681   if (sctp_conn->next_tsn_expected != tsn)      // It means data transmission is GAPPING
 682     {
 683       SCTP_CONN_TRACKING_DBG
 684         ("GAPPING: CONN_INDEX = %u, sctp_conn->next_tsn_expected = %u, tsn = %u, diff = %u",
 685          sctp_conn->sub_conn[idx].connection.c_index,
 686          sctp_conn->next_tsn_expected, tsn,
 687          sctp_conn->next_tsn_expected - tsn);
 688
 689       *gapping = 1;
 690     }
 691 }
 692
 693 always_inline u16
 694 sctp_handle_data (sctp_payload_data_chunk_t * sctp_data_chunk,
 695                   sctp_connection_t * sctp_conn, vlib_buffer_t * b,
 696                   u16 * next0)
 697 {
 698   u32 error = 0, n_data_bytes;
 699   u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
 700   u8 is_gapping = 0;
 701
 702   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 703   if (sctp_conn->local_tag != sctp_data_chunk->sctp_hdr.verification_tag)
 704     {
 705       return SCTP_ERROR_INVALID_TAG;
 706     }
 707
 708   vnet_buffer (b)->sctp.sid = sctp_data_chunk->stream_id;
 709   vnet_buffer (b)->sctp.ssn = sctp_data_chunk->stream_seq;
 710
 711   u32 tsn = clib_net_to_host_u32 (sctp_data_chunk->tsn);
 712
 713   vlib_buffer_advance (b, vnet_buffer (b)->sctp.data_offset);
 714   n_data_bytes = vnet_buffer (b)->sctp.data_len;
 715   ASSERT (n_data_bytes);
 716
 717   sctp_is_connection_gapping (sctp_conn, tsn, &is_gapping);
 718
 719   sctp_conn->last_rcvd_tsn = tsn;
 720
 721   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 722
 723   u8 bbit = vnet_sctp_get_bbit (&sctp_data_chunk->chunk_hdr);
 724   u8 ebit = vnet_sctp_get_ebit (&sctp_data_chunk->chunk_hdr);
 725
 726   if (bbit == 1 && ebit == 1)   /* Unfragmented message */
 727     {
 728       /* In order data, enqueue. Fifo figures out by itself if any out-of-order
 729        * segments can be enqueued after fifo tail offset changes. */
 730       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 731     }
 732   else if (bbit == 1 && ebit == 0)      /* First piece of a fragmented user message */
 733     {
 734       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 735     }
 736   else if (bbit == 0 && ebit == 1)      /* Last piece of a fragmented user message */
 737     {
 738       if (PREDICT_FALSE (is_gapping == 1))
 739         error =
 740           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 741       else
 742         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 743     }
 744   else                          /* Middle piece of a fragmented user message */
 745     {
 746       if (PREDICT_FALSE (is_gapping == 1))
 747         error =
 748           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 749       else
 750         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 751     }
 752   sctp_conn->last_rcvd_tsn = tsn;
 753
 754   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 755
 756   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 757
 758   if (sctp_is_sack_delayable (sctp_conn, is_gapping) != 0)
 759     sctp_prepare_sack_chunk (sctp_conn, b);
 760
 761   return error;
 762 }
 763
 764 always_inline u16
 765 sctp_handle_cookie_echo (sctp_header_t * sctp_hdr,
 766                          sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 767                          sctp_connection_t * sctp_conn, vlib_buffer_t * b0)
 768 {
 769   u32 now = sctp_time_now ();
 770
 771   /* Build TCB */
 772   u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ECHO);
 773
 774   sctp_cookie_echo_chunk_t *cookie_echo =
 775     (sctp_cookie_echo_chunk_t *) sctp_hdr;
 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_hdr->verification_tag)
 779     {
 780       return SCTP_ERROR_INVALID_TAG;
 781     }
 782
 783   sctp_calculate_rto (sctp_conn, idx);
 784
 785   u32 creation_time =
 786     clib_net_to_host_u32 (cookie_echo->cookie.creation_time);
 787   u32 cookie_lifespan =
 788     clib_net_to_host_u32 (cookie_echo->cookie.cookie_lifespan);
 789   if (now > creation_time + cookie_lifespan)
 790     {
 791       SCTP_DBG ("now (%u) > creation_time (%u) + cookie_lifespan (%u)",
 792                 now, creation_time, cookie_lifespan);
 793       return SCTP_ERROR_COOKIE_ECHO_VIOLATION;
 794     }
 795
 796   sctp_prepare_cookie_ack_chunk (sctp_conn, b0);
 797
 798   /* Change state */
 799   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 800
 801   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 802
 803   return SCTP_ERROR_NONE;
 804
 805 }
 806
 807 always_inline u16
 808 sctp_handle_cookie_ack (sctp_header_t * sctp_hdr,
 809                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 810                         sctp_connection_t * sctp_conn, vlib_buffer_t * b0)
 811 {
 812
 813   /* Stop T1_COOKIE timer */
 814   u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ACK);
 815
 816   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 817   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 818     {
 819       return SCTP_ERROR_INVALID_TAG;
 820     }
 821
 822   sctp_calculate_rto (sctp_conn, idx);
 823
 824   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_COOKIE);
 825   /* Change state */
 826   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 827
 828   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 829
 830   return SCTP_ERROR_NONE;
 831
 832 }
 833
 834 always_inline uword
 835 sctp46_rcv_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 836                          vlib_frame_t * from_frame, int is_ip4)
 837 {
 838   sctp_main_t *tm = vnet_get_sctp_main ();
 839
 840   u32 n_left_from, next_index, *from, *to_next;
 841   u32 my_thread_index = vm->thread_index;
 842
 843   from = vlib_frame_vector_args (from_frame);
 844   n_left_from = from_frame->n_vectors;
 845
 846   next_index = node->cached_next_index;
 847
 848   while (n_left_from > 0)
 849     {
 850       u32 n_left_to_next;
 851
 852       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 853
 854       while (n_left_from > 0 && n_left_to_next > 0)
 855         {
 856           u32 bi0;
 857           vlib_buffer_t *b0;
 858           sctp_header_t *sctp_hdr = 0;
 859           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
 860           ip4_header_t *ip4_hdr = 0;
 861           ip6_header_t *ip6_hdr = 0;
 862           sctp_connection_t *sctp_conn, *new_sctp_conn;
 863           u16 sctp_implied_length = 0;
 864           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
 865           u8 idx;
 866
 867           bi0 = from[0];
 868           to_next[0] = bi0;
 869           from += 1;
 870           to_next += 1;
 871           n_left_from -= 1;
 872           n_left_to_next -= 1;
 873
 874           b0 = vlib_get_buffer (vm, bi0);
 875
 876           /* If we are in SCTP_COOKIE_WAIT_STATE then the connection
 877            * will come from the half-open connections pool.
 878            */
 879           sctp_conn =
 880             sctp_half_open_connection_get (vnet_buffer (b0)->
 881                                            sctp.connection_index);
 882
 883           if (PREDICT_FALSE (sctp_conn == 0))
 884             {
 885               error0 = SCTP_ERROR_INVALID_CONNECTION;
 886               goto drop;
 887             }
 888
 889           if (PREDICT_FALSE (sctp_conn == 0))
 890             {
 891               SCTP_ADV_DBG
 892                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
 893               error0 = SCTP_ERROR_INVALID_CONNECTION;
 894               goto drop;
 895             }
 896           if (is_ip4)
 897             {
 898               ip4_hdr = vlib_buffer_get_current (b0);
 899               sctp_hdr = ip4_next_header (ip4_hdr);
 900             }
 901           else
 902             {
 903               ip6_hdr = vlib_buffer_get_current (b0);
 904               sctp_hdr = ip6_next_header (ip6_hdr);
 905             }
 906           idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
 907
 908           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
 909
 910           transport_connection_t *trans_conn =
 911             &sctp_conn->sub_conn[idx].connection;
 912
 913           trans_conn->lcl_port = sctp_hdr->dst_port;
 914           trans_conn->rmt_port = sctp_hdr->src_port;
 915           trans_conn->is_ip4 = is_ip4;
 916
 917           if (is_ip4)
 918             {
 919               trans_conn->lcl_ip.ip4.as_u32 = ip4_hdr->dst_address.as_u32;
 920               trans_conn->rmt_ip.ip4.as_u32 = ip4_hdr->src_address.as_u32;
 921             }
 922           else
 923             {
 924               clib_memcpy (&trans_conn->lcl_ip.ip6, &ip6_hdr->dst_address,
 925                            sizeof (ip6_address_t));
 926               clib_memcpy (&trans_conn->rmt_ip.ip6, &ip6_hdr->src_address,
 927                            sizeof (ip6_address_t));
 928             }
 929
 930           sctp_chunk_hdr =
 931             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
 932
 933           sctp_implied_length =
 934             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
 935
 936           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
 937
 938           switch (chunk_type)
 939             {
 940             case INIT_ACK:
 941               error0 =
 942                 sctp_is_valid_init_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
 943                                         b0, sctp_implied_length);
 944
 945               if (error0 == SCTP_ERROR_NONE)
 946                 {
 947                   pool_get (tm->connections[my_thread_index], new_sctp_conn);
 948                   clib_memcpy (new_sctp_conn, sctp_conn,
 949                                sizeof (*new_sctp_conn));
 950                   new_sctp_conn->sub_conn[idx].c_c_index =
 951                     new_sctp_conn - tm->connections[my_thread_index];
 952                   new_sctp_conn->sub_conn[idx].c_thread_index =
 953                     my_thread_index;
 954                   new_sctp_conn->sub_conn[idx].parent = new_sctp_conn;
 955
 956                   if (sctp_half_open_connection_cleanup (sctp_conn))
 957                     {
 958                       SCTP_DBG
 959                         ("Cannot cleanup half-open connection; not the owning thread");
 960                     }
 961
 962                   sctp_connection_timers_init (new_sctp_conn);
 963
 964                   error0 =
 965                     sctp_handle_init_ack (sctp_hdr, sctp_chunk_hdr,
 966                                           new_sctp_conn, idx, b0,
 967                                           sctp_implied_length);
 968
 969                   sctp_init_mss (new_sctp_conn);
 970
 971                   if (session_stream_connect_notify
 972                       (&new_sctp_conn->sub_conn[idx].connection, 0))
 973                     {
 974                       SCTP_DBG
 975                         ("conn_index = %u: session_stream_connect_notify error; cleaning up connection",
 976                          new_sctp_conn->sub_conn[idx].connection.c_index);
 977                       sctp_connection_cleanup (new_sctp_conn);
 978                       goto drop;
 979                     }
 980                 }
 981               next0 = sctp_next_output (is_ip4);
 982               break;
 983
 984               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
 985                * are handled by the input-dispatcher function using the table-lookup
 986                * hence we should never get to the "default" case below.
 987                */
 988             default:
 989               error0 = SCTP_ERROR_UNKOWN_CHUNK;
 990               next0 = SCTP_NEXT_DROP;
 991               goto drop;
 992             }
 993
 994           if (error0 != SCTP_ERROR_NONE)
 995             {
 996               clib_warning ("error while parsing chunk");
 997               sctp_connection_cleanup (sctp_conn);
 998               next0 = SCTP_NEXT_DROP;
 999               goto drop;
1000             }
1001
1002         drop:
1003           b0->error = node->errors[error0];
1004           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1005             {
1006               sctp_rx_trace_t *t0 =
1007                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1008               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1009             }
1010
1011           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1012                                            n_left_to_next, bi0, next0);
1013         }
1014
1015       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1016     }
1017   return from_frame->n_vectors;
1018 }
1019
1020 static uword
1021 sctp4_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1022                  vlib_frame_t * from_frame)
1023 {
1024   return sctp46_rcv_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1025 }
1026
1027 static uword
1028 sctp6_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1029                  vlib_frame_t * from_frame)
1030 {
1031   return sctp46_rcv_phase_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1032 }
1033
1034 u8 *
1035 format_sctp_rx_trace_short (u8 * s, va_list * args)
1036 {
1037   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1038   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1039   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1040
1041   s = format (s, "%d -> %d (%U)",
1042               clib_net_to_host_u16 (t->sctp_header.src_port),
1043               clib_net_to_host_u16 (t->sctp_header.dst_port),
1044               format_sctp_state, t->sctp_connection.state);
1045
1046   return s;
1047 }
1048
1049 /* *INDENT-OFF* */
1050 VLIB_REGISTER_NODE (sctp4_rcv_phase_node) =
1051 {
1052   .function = sctp4_rcv_phase,
1053   .name = "sctp4-rcv",
1054   /* Takes a vector of packets. */
1055   .vector_size = sizeof (u32),
1056   .n_errors = SCTP_N_ERROR,
1057   .error_strings = sctp_error_strings,
1058   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1059   .next_nodes =
1060   {
1061 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1062     foreach_sctp_state_next
1063 #undef _
1064   },
1065   .format_trace = format_sctp_rx_trace_short,
1066 };
1067 /* *INDENT-ON* */
1068
1069 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_rcv_phase_node, sctp4_rcv_phase);
1070
1071 /* *INDENT-OFF* */
1072 VLIB_REGISTER_NODE (sctp6_init_phase_node) =
1073 {
1074   .function = sctp6_rcv_phase,
1075   .name = "sctp6-rcv",
1076   /* Takes a vector of packets. */
1077   .vector_size = sizeof (u32),
1078   .n_errors = SCTP_N_ERROR,
1079   .error_strings = sctp_error_strings,
1080   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1081   .next_nodes =
1082   {
1083 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1084     foreach_sctp_state_next
1085 #undef _
1086   },
1087   .format_trace = format_sctp_rx_trace_short,
1088 };
1089 /* *INDENT-ON* */
1090
1091 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_init_phase_node, sctp6_rcv_phase);
1092
1093 vlib_node_registration_t sctp4_shutdown_phase_node;
1094 vlib_node_registration_t sctp6_shutdown_phase_node;
1095
1096 always_inline u16
1097 sctp_handle_shutdown (sctp_header_t * sctp_hdr,
1098                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1099                       sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
1100                       u16 sctp_implied_length)
1101 {
1102   sctp_shutdown_association_chunk_t *shutdown_chunk =
1103     (sctp_shutdown_association_chunk_t *) (sctp_hdr);
1104
1105   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1106   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1107     {
1108       return SCTP_ERROR_INVALID_TAG;
1109     }
1110
1111   /*
1112    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1113    */
1114   if (sctp_is_bundling (sctp_implied_length, &shutdown_chunk->chunk_hdr))
1115     return SCTP_ERROR_BUNDLING_VIOLATION;
1116
1117   switch (sctp_conn->state)
1118     {
1119     case SCTP_STATE_ESTABLISHED:
1120       if (sctp_check_outstanding_data_chunks (sctp_conn) == 0)
1121         sctp_conn->state = SCTP_STATE_SHUTDOWN_RECEIVED;
1122       break;
1123
1124     case SCTP_STATE_SHUTDOWN_SENT:
1125       sctp_send_shutdown_ack (sctp_conn);
1126       break;
1127     }
1128
1129   return SCTP_ERROR_NONE;
1130 }
1131
1132 always_inline u16
1133 sctp_handle_shutdown_ack (sctp_header_t * sctp_hdr,
1134                           sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1135                           sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
1136                           u16 sctp_implied_length)
1137 {
1138   sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
1139     (sctp_shutdown_ack_chunk_t *) (sctp_hdr);
1140
1141   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1142   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1143     {
1144       return SCTP_ERROR_INVALID_TAG;
1145     }
1146
1147   /*
1148    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1149    */
1150   if (sctp_is_bundling (sctp_implied_length, &shutdown_ack_chunk->chunk_hdr))
1151     return SCTP_ERROR_BUNDLING_VIOLATION;
1152
1153   /* Whether we are in SCTP_STATE_SHUTDOWN_SENT or SCTP_STATE_SHUTDOWN_ACK_SENT
1154    * the reception of a SHUTDOWN_ACK chunk leads to the same actions:
1155    * - STOP T2_SHUTDOWN timer
1156    * - SEND SHUTDOWN_COMPLETE chunk
1157    */
1158   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1159                     SCTP_TIMER_T2_SHUTDOWN);
1160   sctp_send_shutdown_complete (sctp_conn);
1161
1162   return SCTP_ERROR_NONE;
1163 }
1164
1165 always_inline u16
1166 sctp_handle_shutdown_complete (sctp_header_t * sctp_hdr,
1167                                sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1168                                sctp_connection_t * sctp_conn,
1169                                vlib_buffer_t * b0, u16 sctp_implied_length)
1170 {
1171   sctp_shutdown_complete_chunk_t *shutdown_complete =
1172     (sctp_shutdown_complete_chunk_t *) (sctp_hdr);
1173
1174   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1175   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1176     {
1177       return SCTP_ERROR_INVALID_TAG;
1178     }
1179
1180   /*
1181    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1182    */
1183   if (sctp_is_bundling (sctp_implied_length, &shutdown_complete->chunk_hdr))
1184     return SCTP_ERROR_BUNDLING_VIOLATION;
1185
1186   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1187                     SCTP_TIMER_T2_SHUTDOWN);
1188
1189   sctp_conn->state = SCTP_STATE_CLOSED;
1190
1191   stream_session_disconnect_notify (&sctp_conn->sub_conn
1192                                     [MAIN_SCTP_SUB_CONN_IDX].connection);
1193
1194   return SCTP_ERROR_NONE;
1195 }
1196
1197 always_inline uword
1198 sctp46_shutdown_phase_inline (vlib_main_t * vm,
1199                               vlib_node_runtime_t * node,
1200                               vlib_frame_t * from_frame, int is_ip4)
1201 {
1202   u32 n_left_from, next_index, *from, *to_next;
1203   u32 my_thread_index = vm->thread_index;
1204
1205   from = vlib_frame_vector_args (from_frame);
1206   n_left_from = from_frame->n_vectors;
1207
1208   next_index = node->cached_next_index;
1209
1210   while (n_left_from > 0)
1211     {
1212       u32 n_left_to_next;
1213
1214       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1215
1216       while (n_left_from > 0 && n_left_to_next > 0)
1217         {
1218           u32 bi0;
1219           vlib_buffer_t *b0;
1220           sctp_rx_trace_t *sctp_trace;
1221           sctp_header_t *sctp_hdr = 0;
1222           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1223           ip4_header_t *ip4_hdr = 0;
1224           ip6_header_t *ip6_hdr = 0;
1225           sctp_connection_t *sctp_conn;
1226           u16 sctp_implied_length = 0;
1227           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
1228
1229           bi0 = from[0];
1230           to_next[0] = bi0;
1231           from += 1;
1232           to_next += 1;
1233           n_left_from -= 1;
1234           n_left_to_next -= 1;
1235
1236           b0 = vlib_get_buffer (vm, bi0);
1237           sctp_conn =
1238             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1239                                  my_thread_index);
1240
1241           if (PREDICT_FALSE (sctp_conn == 0))
1242             {
1243               SCTP_DBG
1244                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1245               error0 = SCTP_ERROR_INVALID_CONNECTION;
1246               goto drop;
1247             }
1248
1249           if (is_ip4)
1250             {
1251               ip4_hdr = vlib_buffer_get_current (b0);
1252               sctp_hdr = ip4_next_header (ip4_hdr);
1253             }
1254           else
1255             {
1256               ip6_hdr = vlib_buffer_get_current (b0);
1257               sctp_hdr = ip6_next_header (ip6_hdr);
1258             }
1259
1260           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1261           sctp_chunk_hdr = &full_hdr->common_hdr;
1262
1263           sctp_implied_length =
1264             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1265
1266           switch (vnet_sctp_get_chunk_type (sctp_chunk_hdr))
1267             {
1268             case SHUTDOWN:
1269               error0 =
1270                 sctp_handle_shutdown (sctp_hdr, sctp_chunk_hdr, sctp_conn, b0,
1271                                       sctp_implied_length);
1272               next0 = sctp_next_output (is_ip4);
1273               break;
1274
1275             case SHUTDOWN_ACK:
1276               error0 =
1277                 sctp_handle_shutdown_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1278                                           b0, sctp_implied_length);
1279               next0 = sctp_next_output (is_ip4);
1280               break;
1281
1282             case SHUTDOWN_COMPLETE:
1283               error0 =
1284                 sctp_handle_shutdown_complete (sctp_hdr, sctp_chunk_hdr,
1285                                                sctp_conn, b0,
1286                                                sctp_implied_length);
1287
1288               sctp_connection_cleanup (sctp_conn);
1289               next0 = sctp_next_output (is_ip4);
1290               break;
1291
1292               /*
1293                * DATA chunks can still be transmitted/received in the SHUTDOWN-PENDING
1294                * and SHUTDOWN-SENT states (as per RFC4960 Section 6)
1295                */
1296             case DATA:
1297               error0 =
1298                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1299                                   sctp_conn, b0, &next0);
1300               next0 = sctp_next_output (is_ip4);
1301               break;
1302
1303               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1304                * are handled by the input-dispatcher function using the table-lookup
1305                * hence we should never get to the "default" case below.
1306                */
1307             default:
1308               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1309               next0 = SCTP_NEXT_DROP;
1310               goto drop;
1311             }
1312
1313           if (error0 != SCTP_ERROR_NONE)
1314             {
1315               clib_warning ("error while parsing chunk");
1316               sctp_connection_cleanup (sctp_conn);
1317               next0 = SCTP_NEXT_DROP;
1318               goto drop;
1319             }
1320
1321         drop:
1322           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1323             {
1324               sctp_trace =
1325                 vlib_add_trace (vm, node, b0, sizeof (*sctp_trace));
1326               clib_memcpy (&sctp_trace->sctp_header, sctp_hdr,
1327                            sizeof (sctp_trace->sctp_header));
1328               clib_memcpy (&sctp_trace->sctp_connection, sctp_conn,
1329                            sizeof (sctp_trace->sctp_connection));
1330             }
1331
1332           b0->error = node->errors[error0];
1333
1334           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1335                                            n_left_to_next, bi0, next0);
1336         }
1337
1338       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1339     }
1340
1341   return from_frame->n_vectors;
1342
1343 }
1344
1345 static uword
1346 sctp4_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1347                       vlib_frame_t * from_frame)
1348 {
1349   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1350 }
1351
1352 static uword
1353 sctp6_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1354                       vlib_frame_t * from_frame)
1355 {
1356   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1357 }
1358
1359 /* *INDENT-OFF* */
1360 VLIB_REGISTER_NODE (sctp4_shutdown_phase_node) =
1361 {
1362   .function = sctp4_shutdown_phase,
1363   .name = "sctp4-shutdown",
1364   /* Takes a vector of packets. */
1365   .vector_size = sizeof (u32),
1366   .n_errors = SCTP_N_ERROR,
1367   .error_strings = sctp_error_strings,
1368   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1369   .next_nodes =
1370   {
1371 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1372     foreach_sctp_state_next
1373 #undef _
1374   },
1375   .format_trace = format_sctp_rx_trace_short,
1376 };
1377 /* *INDENT-ON* */
1378
1379 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_shutdown_phase_node,
1380                               sctp4_shutdown_phase);
1381
1382 /* *INDENT-OFF* */
1383 VLIB_REGISTER_NODE (sctp6_shutdown_phase_node) =
1384 {
1385   .function = sctp6_shutdown_phase,
1386   .name = "sctp6-shutdown",
1387   /* Takes a vector of packets. */
1388   .vector_size = sizeof (u32),
1389   .n_errors = SCTP_N_ERROR,
1390   .error_strings = sctp_error_strings,
1391   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1392   .next_nodes =
1393   {
1394 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1395     foreach_sctp_state_next
1396 #undef _
1397   },
1398   .format_trace = format_sctp_rx_trace_short,
1399 };
1400 /* *INDENT-ON* */
1401
1402 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_shutdown_phase_node,
1403                               sctp6_shutdown_phase);
1404
1405 vlib_node_registration_t sctp4_listen_phase_node;
1406 vlib_node_registration_t sctp6_listen_phase_node;
1407
1408 vlib_node_registration_t sctp4_established_phase_node;
1409 vlib_node_registration_t sctp6_established_phase_node;
1410
1411 always_inline u16
1412 sctp_handle_sack (sctp_selective_ack_chunk_t * sack_chunk,
1413                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b0,
1414                   u16 * next0)
1415 {
1416   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1417   if (sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag)
1418     {
1419       return SCTP_ERROR_INVALID_TAG;
1420     }
1421
1422   sctp_calculate_rto (sctp_conn, idx);
1423
1424   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1425                      sctp_conn->sub_conn[idx].RTO);
1426
1427   sctp_conn->sub_conn[idx].RTO_pending = 0;
1428
1429   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1430
1431   return SCTP_ERROR_NONE;
1432 }
1433
1434 always_inline u16
1435 sctp_handle_heartbeat (sctp_hb_req_chunk_t * sctp_hb_chunk,
1436                        sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
1437                        u16 * next0)
1438 {
1439   return SCTP_ERROR_NONE;
1440 }
1441
1442 always_inline u16
1443 sctp_handle_heartbeat_ack (sctp_hb_ack_chunk_t * sctp_hb_ack_chunk,
1444                            sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
1445                            u16 * next0)
1446 {
1447   return SCTP_ERROR_NONE;
1448 }
1449
1450 always_inline void
1451 sctp_node_inc_counter (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1452                        u8 is_ip4, u8 evt, u8 val)
1453 {
1454   if (PREDICT_TRUE (!val))
1455     return;
1456
1457   if (is_ip4)
1458     vlib_node_increment_counter (vm, tcp4_node, evt, val);
1459   else
1460     vlib_node_increment_counter (vm, tcp6_node, evt, val);
1461 }
1462
1463 always_inline uword
1464 sctp46_listen_process_inline (vlib_main_t * vm,
1465                               vlib_node_runtime_t * node,
1466                               vlib_frame_t * from_frame, int is_ip4)
1467 {
1468   u32 n_left_from, next_index, *from, *to_next;
1469   u32 my_thread_index = vm->thread_index;
1470
1471   from = vlib_frame_vector_args (from_frame);
1472   n_left_from = from_frame->n_vectors;
1473
1474   next_index = node->cached_next_index;
1475
1476   while (n_left_from > 0)
1477     {
1478       u32 n_left_to_next;
1479
1480       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1481
1482       while (n_left_from > 0 && n_left_to_next > 0)
1483         {
1484           u32 bi0;
1485           vlib_buffer_t *b0;
1486           sctp_header_t *sctp_hdr = 0;
1487           ip4_header_t *ip4_hdr;
1488           ip6_header_t *ip6_hdr;
1489           sctp_connection_t *child_conn;
1490           sctp_connection_t *sctp_listener;
1491           u16 next0 = SCTP_LISTEN_PHASE_N_NEXT, error0 = SCTP_ERROR_ENQUEUED;
1492
1493           bi0 = from[0];
1494           to_next[0] = bi0;
1495           from += 1;
1496           to_next += 1;
1497           n_left_from -= 1;
1498           n_left_to_next -= 1;
1499
1500           b0 = vlib_get_buffer (vm, bi0);
1501           sctp_listener =
1502             sctp_listener_get (vnet_buffer (b0)->sctp.connection_index);
1503
1504           if (is_ip4)
1505             {
1506               ip4_hdr = vlib_buffer_get_current (b0);
1507               sctp_hdr = ip4_next_header (ip4_hdr);
1508             }
1509           else
1510             {
1511               ip6_hdr = vlib_buffer_get_current (b0);
1512               sctp_hdr = ip6_next_header (ip6_hdr);
1513             }
1514
1515           child_conn =
1516             sctp_lookup_connection (sctp_listener->sub_conn
1517                                     [MAIN_SCTP_SUB_CONN_IDX].c_fib_index, b0,
1518                                     my_thread_index, is_ip4);
1519
1520           if (PREDICT_FALSE (child_conn->state != SCTP_STATE_CLOSED))
1521             {
1522               SCTP_DBG
1523                 ("conn_index = %u: child_conn->state != SCTP_STATE_CLOSED.... STATE=%s",
1524                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1525                  connection.c_index,
1526                  sctp_state_to_string (child_conn->state));
1527               error0 = SCTP_ERROR_CREATE_EXISTS;
1528               goto drop;
1529             }
1530
1531           /* Create child session and send SYN-ACK */
1532           child_conn = sctp_connection_new (my_thread_index);
1533           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = child_conn;
1534           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_port =
1535             sctp_hdr->dst_port;
1536           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_port =
1537             sctp_hdr->src_port;
1538           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_is_ip4 = is_ip4;
1539           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto =
1540             sctp_listener->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto;
1541           child_conn->state = SCTP_STATE_CLOSED;
1542
1543           if (is_ip4)
1544             {
1545               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip4.as_u32 =
1546                 ip4_hdr->dst_address.as_u32;
1547               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip4.as_u32 =
1548                 ip4_hdr->src_address.as_u32;
1549             }
1550           else
1551             {
1552               clib_memcpy (&child_conn->
1553                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip6,
1554                            &ip6_hdr->dst_address, sizeof (ip6_address_t));
1555               clib_memcpy (&child_conn->
1556                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip6,
1557                            &ip6_hdr->src_address, sizeof (ip6_address_t));
1558             }
1559
1560           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1561           sctp_chunks_common_hdr_t *sctp_chunk_hdr = &full_hdr->common_hdr;
1562
1563           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1564           if (chunk_type != INIT)
1565             {
1566               SCTP_DBG
1567                 ("conn_index = %u: chunk_type != INIT... chunk_type=%s",
1568                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1569                  connection.c_index, sctp_chunk_to_string (chunk_type));
1570
1571               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1572               next0 = SCTP_NEXT_DROP;
1573               goto drop;
1574             }
1575
1576           u16 sctp_implied_length =
1577             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1578
1579           switch (chunk_type)
1580             {
1581             case INIT:
1582               sctp_connection_timers_init (child_conn);
1583
1584               sctp_init_snd_vars (child_conn);
1585
1586               error0 =
1587                 sctp_handle_init (sctp_hdr, sctp_chunk_hdr, child_conn, b0,
1588                                   sctp_implied_length);
1589
1590               sctp_init_mss (child_conn);
1591
1592               if (error0 == SCTP_ERROR_NONE)
1593                 {
1594                   if (stream_session_accept
1595                       (&child_conn->
1596                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection,
1597                        sctp_listener->
1598                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_s_index, 0))
1599                     {
1600                       clib_warning ("session accept fail");
1601                       sctp_connection_cleanup (child_conn);
1602                       error0 = SCTP_ERROR_CREATE_SESSION_FAIL;
1603                       goto drop;
1604                     }
1605                 }
1606               next0 = sctp_next_output (is_ip4);
1607               break;
1608
1609               /* Reception of a DATA chunk whilst in the CLOSED state is called
1610                * "Out of the Blue" packet and handling of the chunk needs special treatment
1611                * as per RFC4960 section 8.4
1612                */
1613             case DATA:
1614               break;
1615             }
1616
1617         drop:
1618           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1619             {
1620               sctp_rx_trace_t *t0 =
1621                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1622               clib_memcpy (&t0->sctp_header, sctp_hdr,
1623                            sizeof (t0->sctp_header));
1624               clib_memcpy (&t0->sctp_connection, sctp_listener,
1625                            sizeof (t0->sctp_connection));
1626             }
1627
1628           b0->error = node->errors[error0];
1629
1630           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1631                                            n_left_to_next, bi0, next0);
1632         }
1633       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1634
1635     }
1636   return from_frame->n_vectors;
1637 }
1638
1639 static uword
1640 sctp4_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1641                     vlib_frame_t * from_frame)
1642 {
1643   return sctp46_listen_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1644 }
1645
1646 static uword
1647 sctp6_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1648                     vlib_frame_t * from_frame)
1649 {
1650   return sctp46_listen_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1651 }
1652
1653 always_inline uword
1654 sctp46_established_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1655                                  vlib_frame_t * from_frame, int is_ip4)
1656 {
1657   u32 n_left_from, next_index, *from, *to_next;
1658   u32 my_thread_index = vm->thread_index, errors = 0;
1659
1660   from = vlib_frame_vector_args (from_frame);
1661   n_left_from = from_frame->n_vectors;
1662
1663   next_index = node->cached_next_index;
1664
1665   while (n_left_from > 0)
1666     {
1667       u32 n_left_to_next;
1668
1669       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1670
1671       while (n_left_from > 0 && n_left_to_next > 0)
1672         {
1673           u32 bi0;
1674           vlib_buffer_t *b0;
1675           sctp_header_t *sctp_hdr = 0;
1676           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1677           ip4_header_t *ip4_hdr = 0;
1678           ip6_header_t *ip6_hdr = 0;
1679           sctp_connection_t *sctp_conn;
1680           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_ESTABLISHED_PHASE_N_NEXT;
1681           u8 idx;
1682
1683           bi0 = from[0];
1684           to_next[0] = bi0;
1685           from += 1;
1686           to_next += 1;
1687           n_left_from -= 1;
1688           n_left_to_next -= 1;
1689
1690           b0 = vlib_get_buffer (vm, bi0);
1691           sctp_conn =
1692             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1693                                  my_thread_index);
1694
1695           if (PREDICT_FALSE (sctp_conn == 0))
1696             {
1697               SCTP_DBG
1698                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1699               error0 = SCTP_ERROR_INVALID_CONNECTION;
1700               goto done;
1701             }
1702           if (is_ip4)
1703             {
1704               ip4_hdr = vlib_buffer_get_current (b0);
1705               sctp_hdr = ip4_next_header (ip4_hdr);
1706             }
1707           else
1708             {
1709               ip6_hdr = vlib_buffer_get_current (b0);
1710               sctp_hdr = ip6_next_header (ip6_hdr);
1711             }
1712
1713           idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
1714
1715           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1716
1717           transport_connection_t *trans_conn =
1718             &sctp_conn->sub_conn[idx].connection;
1719
1720           trans_conn->lcl_port = sctp_hdr->dst_port;
1721           trans_conn->rmt_port = sctp_hdr->src_port;
1722           trans_conn->is_ip4 = is_ip4;
1723
1724           sctp_conn->sub_conn[idx].parent = sctp_conn;
1725
1726           if (is_ip4)
1727             {
1728               trans_conn->lcl_ip.ip4.as_u32 = ip4_hdr->dst_address.as_u32;
1729               trans_conn->rmt_ip.ip4.as_u32 = ip4_hdr->src_address.as_u32;
1730             }
1731           else
1732             {
1733               clib_memcpy (&trans_conn->lcl_ip.ip6, &ip6_hdr->dst_address,
1734                            sizeof (ip6_address_t));
1735               clib_memcpy (&trans_conn->rmt_ip.ip6, &ip6_hdr->src_address,
1736                            sizeof (ip6_address_t));
1737             }
1738
1739           sctp_chunk_hdr =
1740             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
1741
1742           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1743
1744           switch (chunk_type)
1745             {
1746             case COOKIE_ECHO:
1747               error0 =
1748                 sctp_handle_cookie_echo (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1749                                          b0);
1750               next0 = sctp_next_output (is_ip4);
1751               break;
1752
1753             case COOKIE_ACK:
1754               error0 =
1755                 sctp_handle_cookie_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1756                                         b0);
1757               next0 = sctp_next_output (is_ip4);
1758               break;
1759
1760             case SACK:
1761               error0 =
1762                 sctp_handle_sack ((sctp_selective_ack_chunk_t *) sctp_hdr,
1763                                   sctp_conn, idx, b0, &next0);
1764               break;
1765
1766             case HEARTBEAT:
1767               error0 =
1768                 sctp_handle_heartbeat ((sctp_hb_req_chunk_t *) sctp_hdr,
1769                                        sctp_conn, b0, &next0);
1770               break;
1771
1772             case HEARTBEAT_ACK:
1773               error0 =
1774                 sctp_handle_heartbeat_ack ((sctp_hb_ack_chunk_t *) sctp_hdr,
1775                                            sctp_conn, b0, &next0);
1776               break;
1777
1778             case DATA:
1779               error0 =
1780                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1781                                   sctp_conn, b0, &next0);
1782               break;
1783
1784               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1785                * are handled by the input-dispatcher function using the table-lookup
1786                * hence we should never get to the "default" case below.
1787                */
1788             default:
1789               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1790               next0 = SCTP_NEXT_DROP;
1791               goto done;
1792             }
1793
1794         done:
1795           b0->error = node->errors[error0];
1796           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1797             {
1798               sctp_rx_trace_t *t0 =
1799                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1800               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1801             }
1802
1803           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1804                                            n_left_to_next, bi0, next0);
1805         }
1806
1807       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1808     }
1809
1810   errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_SCTP,
1811                                                  my_thread_index);
1812
1813   sctp_node_inc_counter (vm, is_ip4, sctp4_established_phase_node.index,
1814                          sctp6_established_phase_node.index,
1815                          SCTP_ERROR_EVENT_FIFO_FULL, errors);
1816   sctp_flush_frame_to_output (vm, my_thread_index, is_ip4);
1817
1818   return from_frame->n_vectors;
1819 }
1820
1821 static uword
1822 sctp4_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1823                          vlib_frame_t * from_frame)
1824 {
1825   return sctp46_established_phase_inline (vm, node, from_frame,
1826                                           1 /* is_ip4 */ );
1827 }
1828
1829 static uword
1830 sctp6_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1831                          vlib_frame_t * from_frame)
1832 {
1833   return sctp46_established_phase_inline (vm, node, from_frame,
1834                                           0 /* is_ip4 */ );
1835 }
1836
1837 u8 *
1838 format_sctp_rx_trace (u8 * s, va_list * args)
1839 {
1840   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1841   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1842   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1843   u32 indent = format_get_indent (s);
1844
1845   s = format (s, "%U\n%U%U",
1846               format_sctp_header, &t->sctp_header, 128,
1847               format_white_space, indent,
1848               format_sctp_connection, &t->sctp_connection, 1);
1849
1850   return s;
1851 }
1852
1853 /* *INDENT-OFF* */
1854 VLIB_REGISTER_NODE (sctp4_listen_phase_node) =
1855 {
1856   .function = sctp4_listen_phase,
1857   .name = "sctp4-listen",
1858   /* Takes a vector of packets. */
1859   .vector_size = sizeof (u32),
1860   .n_errors = SCTP_N_ERROR,
1861   .error_strings = sctp_error_strings,
1862   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1863   .next_nodes =
1864   {
1865 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1866     foreach_sctp_state_next
1867 #undef _
1868   },
1869   .format_trace = format_sctp_rx_trace_short,
1870 };
1871 /* *INDENT-ON* */
1872
1873 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_listen_phase_node, sctp4_listen_phase);
1874
1875 /* *INDENT-OFF* */
1876 VLIB_REGISTER_NODE (sctp6_listen_phase_node) =
1877 {
1878   .function = sctp6_listen_phase,
1879   .name = "sctp6-listen",
1880   /* Takes a vector of packets. */
1881   .vector_size = sizeof (u32),
1882   .n_errors = SCTP_N_ERROR,
1883   .error_strings = sctp_error_strings,
1884   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1885   .next_nodes =
1886   {
1887 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1888     foreach_sctp_state_next
1889 #undef _
1890   },
1891   .format_trace = format_sctp_rx_trace_short,
1892 };
1893 /* *INDENT-ON* */
1894
1895 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_listen_phase_node, sctp6_listen_phase);
1896
1897 /* *INDENT-OFF* */
1898 VLIB_REGISTER_NODE (sctp4_established_phase_node) =
1899 {
1900   .function = sctp4_established_phase,
1901   .name = "sctp4-established",
1902   /* Takes a vector of packets. */
1903   .vector_size = sizeof (u32),
1904   .n_errors = SCTP_N_ERROR,
1905   .error_strings = sctp_error_strings,
1906   .n_next_nodes = SCTP_ESTABLISHED_PHASE_N_NEXT,
1907   .next_nodes =
1908   {
1909 #define _(s,n) [SCTP_ESTABLISHED_PHASE_NEXT_##s] = n,
1910     foreach_sctp_state_next
1911 #undef _
1912   },
1913   .format_trace = format_sctp_rx_trace_short,
1914 };
1915 /* *INDENT-ON* */
1916
1917 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_established_phase_node,
1918                               sctp4_established_phase);
1919
1920 /* *INDENT-OFF* */
1921 VLIB_REGISTER_NODE (sctp6_established_phase_node) =
1922 {
1923   .function = sctp6_established_phase,
1924   .name = "sctp6-established",
1925   /* Takes a vector of packets. */
1926   .vector_size = sizeof (u32),
1927   .n_errors = SCTP_N_ERROR,
1928   .error_strings = sctp_error_strings,
1929   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1930   .next_nodes =
1931   {
1932 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1933     foreach_sctp_state_next
1934 #undef _
1935   },
1936   .format_trace = format_sctp_rx_trace_short,
1937 };
1938 /* *INDENT-ON* */
1939
1940 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_established_phase_node,
1941                               sctp6_established_phase);
1942
1943 /*
1944  * This is the function executed first for the SCTP graph.
1945  * It takes care of doing the initial message parsing and
1946  * dispatch to the specialized function.
1947  */
1948 always_inline uword
1949 sctp46_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
1950                          vlib_frame_t * from_frame, int is_ip4)
1951 {
1952   u32 n_left_from, next_index, *from, *to_next;
1953   u32 my_thread_index = vm->thread_index;
1954   u8 is_filtered;
1955   sctp_main_t *tm = vnet_get_sctp_main ();
1956
1957   from = vlib_frame_vector_args (from_frame);
1958   n_left_from = from_frame->n_vectors;
1959   next_index = node->cached_next_index;
1960   sctp_set_time_now (my_thread_index);
1961
1962   while (n_left_from > 0)
1963     {
1964       u32 n_left_to_next;
1965
1966       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1967
1968       while (n_left_from > 0 && n_left_to_next > 0)
1969         {
1970           int n_advance_bytes0, n_data_bytes0;
1971           u32 bi0, fib_index0;
1972           vlib_buffer_t *b0;
1973           sctp_header_t *sctp_hdr = 0;
1974           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1975           sctp_connection_t *sctp_conn;
1976           transport_connection_t *trans_conn;
1977           ip4_header_t *ip4_hdr;
1978           ip6_header_t *ip6_hdr;
1979           u32 error0 = SCTP_ERROR_NO_LISTENER, next0 = SCTP_INPUT_NEXT_DROP;
1980
1981           bi0 = from[0];
1982           to_next[0] = bi0;
1983           from += 1;
1984           to_next += 1;
1985           n_left_from -= 1;
1986           n_left_to_next -= 1;
1987
1988           b0 = vlib_get_buffer (vm, bi0);
1989           vnet_buffer (b0)->tcp.flags = 0;
1990           fib_index0 = vnet_buffer (b0)->ip.fib_index;
1991
1992           /* Checksum computed by ipx_local no need to compute again */
1993
1994           if (is_ip4)
1995             {
1996               ip4_hdr = vlib_buffer_get_current (b0);
1997               sctp_hdr = ip4_next_header (ip4_hdr);
1998
1999               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2000               sctp_chunk_hdr = &full_hdr->common_hdr;
2001
2002               n_advance_bytes0 =
2003                 (ip4_header_bytes (ip4_hdr) +
2004                  sizeof (sctp_payload_data_chunk_t));
2005               n_data_bytes0 =
2006                 clib_net_to_host_u16 (ip4_hdr->length) - n_advance_bytes0;
2007
2008               trans_conn = session_lookup_connection_wt4 (fib_index0,
2009                                                           &ip4_hdr->dst_address,
2010                                                           &ip4_hdr->src_address,
2011                                                           sctp_hdr->dst_port,
2012                                                           sctp_hdr->src_port,
2013                                                           TRANSPORT_PROTO_SCTP,
2014                                                           my_thread_index,
2015                                                           &is_filtered);
2016             }
2017           else
2018             {
2019               ip6_hdr = vlib_buffer_get_current (b0);
2020               sctp_hdr = ip6_next_header (ip6_hdr);
2021
2022               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2023               sctp_chunk_hdr = &full_hdr->common_hdr;
2024
2025               n_advance_bytes0 = sctp_header_bytes ();
2026               n_data_bytes0 =
2027                 clib_net_to_host_u16 (ip6_hdr->payload_length) -
2028                 n_advance_bytes0;
2029               n_advance_bytes0 += sizeof (ip6_hdr[0]);
2030
2031               trans_conn = session_lookup_connection_wt6 (fib_index0,
2032                                                           &ip6_hdr->dst_address,
2033                                                           &ip6_hdr->src_address,
2034                                                           sctp_hdr->dst_port,
2035                                                           sctp_hdr->src_port,
2036                                                           TRANSPORT_PROTO_SCTP,
2037                                                           my_thread_index,
2038                                                           &is_filtered);
2039             }
2040
2041           /* Length check */
2042           if (PREDICT_FALSE (n_advance_bytes0 < 0))
2043             {
2044               error0 = SCTP_ERROR_LENGTH;
2045               goto done;
2046             }
2047
2048           sctp_conn = sctp_get_connection_from_transport (trans_conn);
2049           vnet_sctp_common_hdr_params_net_to_host (sctp_chunk_hdr);
2050
2051           u8 type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
2052
2053 #if SCTP_DEBUG_STATE_MACHINE
2054           u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
2055 #endif
2056           vnet_buffer (b0)->sctp.hdr_offset =
2057             (u8 *) sctp_hdr - (u8 *) vlib_buffer_get_current (b0);
2058
2059           /* Session exists */
2060           if (PREDICT_TRUE (0 != sctp_conn))
2061             {
2062               /* Save connection index */
2063               vnet_buffer (b0)->sctp.connection_index = trans_conn->c_index;
2064               vnet_buffer (b0)->sctp.data_offset = n_advance_bytes0;
2065               vnet_buffer (b0)->sctp.data_len = n_data_bytes0;
2066
2067               next0 = tm->dispatch_table[sctp_conn->state][type].next;
2068               error0 = tm->dispatch_table[sctp_conn->state][type].error;
2069
2070               SCTP_DBG_STATE_MACHINE ("CONNECTION_INDEX = %u: "
2071                                       "CURRENT_CONNECTION_STATE = %s,"
2072                                       "CHUNK_TYPE_RECEIVED = %s "
2073                                       "NEXT_PHASE = %s",
2074                                       sctp_conn->sub_conn
2075                                       [idx].connection.c_index,
2076                                       sctp_state_to_string (sctp_conn->state),
2077                                       sctp_chunk_to_string (type),
2078                                       phase_to_string (next0));
2079
2080               if (type == DATA)
2081                 SCTP_ADV_DBG ("n_advance_bytes0 = %u, n_data_bytes0 = %u",
2082                               n_advance_bytes0, n_data_bytes0);
2083
2084             }
2085           else
2086             {
2087               if (is_filtered)
2088                 {
2089                   next0 = SCTP_INPUT_NEXT_DROP;
2090                   error0 = SCTP_ERROR_FILTERED;
2091                 }
2092               else if ((is_ip4 && tm->punt_unknown4) ||
2093                        (!is_ip4 && tm->punt_unknown6))
2094                 {
2095                   next0 = SCTP_INPUT_NEXT_PUNT_PHASE;
2096                   error0 = SCTP_ERROR_PUNT;
2097                 }
2098               else
2099                 {
2100                   next0 = SCTP_INPUT_NEXT_DROP;
2101                   error0 = SCTP_ERROR_NO_LISTENER;
2102                 }
2103               SCTP_DBG_STATE_MACHINE ("sctp_conn == NULL, NEXT_PHASE = %s",
2104                                       phase_to_string (next0));
2105               sctp_conn = 0;
2106             }
2107
2108         done:
2109           b0->error = error0 ? node->errors[error0] : 0;
2110
2111           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2112             {
2113               sctp_rx_trace_t *t0 =
2114                 vlib_add_trace (vm, node, b0, sizeof (*t0));
2115               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
2116             }
2117           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2118                                            n_left_to_next, bi0, next0);
2119         }
2120
2121       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2122     }
2123   return from_frame->n_vectors;
2124 }
2125
2126 static uword
2127 sctp4_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2128                         vlib_frame_t * from_frame)
2129 {
2130   return sctp46_input_dispatcher (vm, node, from_frame, 1 /* is_ip4 */ );
2131 }
2132
2133 static uword
2134 sctp6_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2135                         vlib_frame_t * from_frame)
2136 {
2137   return sctp46_input_dispatcher (vm, node, from_frame, 0 /* is_ip4 */ );
2138 }
2139
2140 /* *INDENT-OFF* */
2141 VLIB_REGISTER_NODE (sctp4_input_node) =
2142 {
2143   .function = sctp4_input_dispatcher,
2144   .name = "sctp4-input",
2145   /* Takes a vector of packets. */
2146   .vector_size = sizeof (u32),
2147   .n_errors = SCTP_N_ERROR,
2148   .error_strings = sctp_error_strings,
2149   .n_next_nodes = SCTP_INPUT_N_NEXT,
2150   .next_nodes =
2151   {
2152 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2153     foreach_sctp4_input_next
2154 #undef _
2155   },
2156   .format_buffer = format_sctp_header,
2157   .format_trace = format_sctp_rx_trace,
2158 };
2159 /* *INDENT-ON* */
2160
2161 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_input_node, sctp4_input_dispatcher);
2162
2163 /* *INDENT-OFF* */
2164 VLIB_REGISTER_NODE (sctp6_input_node) =
2165 {
2166   .function = sctp6_input_dispatcher,
2167   .name = "sctp6-input",
2168   /* Takes a vector of packets. */
2169   .vector_size = sizeof (u32),
2170   .n_errors = SCTP_N_ERROR,
2171   .error_strings = sctp_error_strings,
2172   .n_next_nodes = SCTP_INPUT_N_NEXT,
2173   .next_nodes =
2174   {
2175 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2176     foreach_sctp6_input_next
2177 #undef _
2178   },
2179   .format_buffer = format_sctp_header,
2180   .format_trace = format_sctp_rx_trace,
2181 };
2182 /* *INDENT-ON* */
2183
2184 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_input_node, sctp6_input_dispatcher);
2185
2186 vlib_node_registration_t sctp4_input_node;
2187 vlib_node_registration_t sctp6_input_node;
2188
2189 static void
2190 sctp_dispatch_table_init (sctp_main_t * tm)
2191 {
2192   int i, j;
2193   for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
2194     for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
2195       {
2196         tm->dispatch_table[i][j].next = SCTP_INPUT_NEXT_DROP;
2197         tm->dispatch_table[i][j].error = SCTP_ERROR_DISPATCH;
2198       }
2199
2200 #define _(t,f,n,e)                                              \
2201 do {                                                            \
2202     tm->dispatch_table[SCTP_STATE_##t][f].next = (n);           \
2203     tm->dispatch_table[SCTP_STATE_##t][f].error = (e);          \
2204 } while (0)
2205
2206   /*
2207    * SCTP STATE-MACHINE states:
2208    *
2209    * _(CLOSED, "CLOSED")                         \
2210    * _(COOKIE_WAIT, "COOKIE_WAIT")               \
2211    * _(COOKIE_ECHOED, "COOKIE_ECHOED")           \
2212    * _(ESTABLISHED, "ESTABLISHED")               \
2213    * _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING")     \
2214    * _(SHUTDOWN_SENT, "SHUTDOWN_SENT")           \
2215    * _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED")   \
2216    * _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
2217    */
2218   //_(CLOSED, DATA, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED DATA chunk which requires special handling */
2219   _(CLOSED, INIT, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2220   _(CLOSED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);        /* UNEXPECTED INIT_ACK chunk */
2221   _(CLOSED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);       /* UNEXPECTED SACK chunk */
2222   _(CLOSED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT chunk */
2223   _(CLOSED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT_ACK chunk */
2224   _(CLOSED, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2225   _(CLOSED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN chunk */
2226   _(CLOSED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN_ACK chunk */
2227   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);       /* UNEXPECTED OPERATION_ERROR chunk */
2228   _(CLOSED, COOKIE_ECHO, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2229   _(CLOSED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED COOKIE_ACK chunk */
2230   _(CLOSED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);     /* UNEXPECTED ECNE chunk */
2231   _(CLOSED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);       /* UNEXPECTED CWR chunk */
2232   _(CLOSED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);   /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2233
2234   _(COOKIE_WAIT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2235   _(COOKIE_WAIT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED INIT chunk which requires special handling */
2236   _(COOKIE_WAIT, INIT_ACK, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2237   _(COOKIE_WAIT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);  /* UNEXPECTED SACK chunk */
2238   _(COOKIE_WAIT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT chunk */
2239   _(COOKIE_WAIT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT_ACK chunk */
2240   _(COOKIE_WAIT, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2241   _(COOKIE_WAIT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN chunk */
2242   _(COOKIE_WAIT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2243   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2244   _(COOKIE_WAIT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2245   _(COOKIE_WAIT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2246   _(COOKIE_WAIT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2247   _(COOKIE_WAIT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2248   _(COOKIE_WAIT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2249
2250   _(COOKIE_ECHOED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2251   _(COOKIE_ECHOED, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);   /* UNEXPECTED INIT chunk which requires special handling */
2252   _(COOKIE_ECHOED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2253   _(COOKIE_ECHOED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2254   _(COOKIE_ECHOED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2255   _(COOKIE_ECHOED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2256   _(COOKIE_ECHOED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2257   _(COOKIE_ECHOED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN chunk */
2258   _(COOKIE_ECHOED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN_ACK chunk */
2259   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);        /* UNEXPECTED OPERATION_ERROR chunk */
2260   _(COOKIE_ECHOED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2261   _(COOKIE_ECHOED, COOKIE_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2262     SCTP_ERROR_NONE);
2263   _(COOKIE_ECHOED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2264   _(COOKIE_ECHOED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2265   _(COOKIE_ECHOED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2266
2267   _(ESTABLISHED, DATA, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2268   _(ESTABLISHED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);  /* UNEXPECTED INIT chunk */
2269   _(ESTABLISHED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED INIT_ACK chunk */
2270   _(ESTABLISHED, SACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2271   _(ESTABLISHED, HEARTBEAT, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2272     SCTP_ERROR_NONE);
2273   _(ESTABLISHED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2274     SCTP_ERROR_NONE);
2275   _(ESTABLISHED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);        /* UNEXPECTED ABORT chunk */
2276   _(ESTABLISHED, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2277   _(ESTABLISHED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2278   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2279   _(ESTABLISHED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2280   _(ESTABLISHED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2281   _(ESTABLISHED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2282   _(ESTABLISHED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2283   _(ESTABLISHED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2284
2285   _(SHUTDOWN_PENDING, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2286   _(SHUTDOWN_PENDING, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);     /* UNEXPECTED INIT chunk */
2287   _(SHUTDOWN_PENDING, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED INIT_ACK chunk */
2288   _(SHUTDOWN_PENDING, SACK, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2289   _(SHUTDOWN_PENDING, HEARTBEAT, SCTP_INPUT_NEXT_LISTEN_PHASE,
2290     SCTP_ERROR_NONE);
2291   _(SHUTDOWN_PENDING, HEARTBEAT_ACK, SCTP_INPUT_NEXT_LISTEN_PHASE,
2292     SCTP_ERROR_NONE);
2293   _(SHUTDOWN_PENDING, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);   /* UNEXPECTED ABORT chunk */
2294   _(SHUTDOWN_PENDING, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2295     SCTP_ERROR_NONE);
2296   _(SHUTDOWN_PENDING, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);     /* UNEXPECTED SHUTDOWN_ACK chunk */
2297   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);     /* UNEXPECTED OPERATION_ERROR chunk */
2298   _(SHUTDOWN_PENDING, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);     /* UNEXPECTED COOKIE_ECHO chunk */
2299   _(SHUTDOWN_PENDING, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);    /* UNEXPECTED COOKIE_ACK chunk */
2300   _(SHUTDOWN_PENDING, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);   /* UNEXPECTED ECNE chunk */
2301   _(SHUTDOWN_PENDING, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);     /* UNEXPECTED CWR chunk */
2302   _(SHUTDOWN_PENDING, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION); /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2303
2304   _(SHUTDOWN_SENT, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2305   _(SHUTDOWN_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);        /* UNEXPECTED INIT chunk */
2306   _(SHUTDOWN_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2307   _(SHUTDOWN_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2308   _(SHUTDOWN_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2309   _(SHUTDOWN_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2310   _(SHUTDOWN_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2311   _(SHUTDOWN_SENT, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2312   _(SHUTDOWN_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2313     SCTP_ERROR_NONE);
2314   _(SHUTDOWN_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2315   _(SHUTDOWN_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);       /* UNEXPECTED COOKIE_ACK chunk */
2316   _(SHUTDOWN_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2317   _(SHUTDOWN_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2318   _(SHUTDOWN_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2319
2320   _(SHUTDOWN_RECEIVED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2321   _(SHUTDOWN_RECEIVED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2322   _(SHUTDOWN_RECEIVED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2323   _(SHUTDOWN_RECEIVED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2324   _(SHUTDOWN_RECEIVED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2325   _(SHUTDOWN_RECEIVED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2326   _(SHUTDOWN_RECEIVED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2327   _(SHUTDOWN_RECEIVED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2328   _(SHUTDOWN_RECEIVED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2329     SCTP_ERROR_NONE);
2330   _(SHUTDOWN_RECEIVED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2331   _(SHUTDOWN_RECEIVED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2332   _(SHUTDOWN_RECEIVED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2333   _(SHUTDOWN_RECEIVED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2334   _(SHUTDOWN_RECEIVED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);        /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2335
2336   _(SHUTDOWN_ACK_SENT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2337   _(SHUTDOWN_ACK_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2338   _(SHUTDOWN_ACK_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2339   _(SHUTDOWN_ACK_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2340   _(SHUTDOWN_ACK_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2341   _(SHUTDOWN_ACK_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2342   _(SHUTDOWN_ACK_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2343   _(SHUTDOWN_ACK_SENT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2344   _(SHUTDOWN_ACK_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN_ACK chunk */
2345   _(SHUTDOWN_ACK_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2346   _(SHUTDOWN_ACK_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2347   _(SHUTDOWN_ACK_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2348   _(SHUTDOWN_ACK_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2349   _(SHUTDOWN_ACK_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2350     SCTP_ERROR_NONE);
2351
2352   /* TODO: Handle COOKIE ECHO when a TCB Exists */
2353
2354 #undef _
2355 }
2356
2357 clib_error_t *
2358 sctp_input_init (vlib_main_t * vm)
2359 {
2360   clib_error_t *error = 0;
2361   sctp_main_t *tm = vnet_get_sctp_main ();
2362
2363   if ((error = vlib_call_init_function (vm, sctp_init)))
2364     return error;
2365
2366   /* Initialize dispatch table. */
2367   sctp_dispatch_table_init (tm);
2368
2369   return error;
2370 }
2371
2372 VLIB_INIT_FUNCTION (sctp_input_init);
2373
2374 /*
2375  * fd.io coding-style-patch-verification: ON
2376  *
2377  * Local Variables:
2378  * eval: (c-set-style "gnu")
2379  * End:
2380  */