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   sctp_state_cookie_param_t state_cookie;
 436
 437   char hostname[FQDN_MAX_LENGTH];
 438
 439   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 440   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 441     {
 442       return SCTP_ERROR_INVALID_TAG;
 443     }
 444
 445   /*
 446    * It is not possible to bundle any other CHUNK with the INIT chunk
 447    */
 448   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 449     return SCTP_ERROR_BUNDLING_VIOLATION;
 450
 451   sctp_calculate_rto (sctp_conn, idx);
 452
 453   /* remote_tag to be placed in the VERIFICATION_TAG field of the COOKIE_ECHO chunk */
 454   sctp_conn->remote_tag = init_ack_chunk->initiate_tag;
 455   sctp_conn->remote_initial_tsn =
 456     clib_net_to_host_u32 (init_ack_chunk->initial_tsn);
 457   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 458   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 459   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 460                           sctp_conn->remote_initial_tsn);
 461   sctp_conn->snd_opts.a_rwnd = clib_net_to_host_u32 (init_ack_chunk->a_rwnd);
 462
 463   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 464
 465   if (length > sizeof (sctp_init_ack_chunk_t))
 466     /*
 467      * There are optional parameters in the INIT ACK chunk
 468      */
 469     {
 470       u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
 471
 472       while (pointer_offset < length)
 473         {
 474           sctp_opt_params_hdr_t *opt_params_hdr =
 475             (sctp_opt_params_hdr_t *) ((char *) init_ack_chunk +
 476                                        pointer_offset);
 477
 478           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 479             {
 480             case SCTP_IPV4_ADDRESS_TYPE:
 481               {
 482                 sctp_ipv4_addr_param_t *ipv4 =
 483                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 484
 485                 sctp_sub_connection_add_ip4 (vlib_get_thread_index (), ipv4);
 486
 487                 break;
 488               }
 489             case SCTP_IPV6_ADDRESS_TYPE:
 490               {
 491                 sctp_ipv6_addr_param_t *ipv6 =
 492                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 493
 494                 sctp_sub_connection_add_ip6 (vlib_get_thread_index (), ipv6);
 495
 496                 break;
 497               }
 498             case SCTP_STATE_COOKIE_TYPE:
 499               {
 500                 sctp_state_cookie_param_t *state_cookie_param =
 501                   (sctp_state_cookie_param_t *) opt_params_hdr;
 502
 503                 clib_memcpy (&state_cookie, state_cookie_param,
 504                              sizeof (sctp_state_cookie_param_t));
 505                 break;
 506               }
 507             case SCTP_HOSTNAME_ADDRESS_TYPE:
 508               {
 509                 sctp_hostname_param_t *hostname_addr =
 510                   (sctp_hostname_param_t *) opt_params_hdr;
 511                 clib_memcpy (hostname, hostname_addr->hostname,
 512                              FQDN_MAX_LENGTH);
 513                 break;
 514               }
 515             case SCTP_UNRECOGNIZED_TYPE:
 516               {
 517                 break;
 518               }
 519             }
 520           u16 increment = clib_net_to_host_u16 (opt_params_hdr->length);
 521           /* This indicates something really bad happened */
 522           if (increment == 0)
 523             {
 524               return SCTP_ERROR_INVALID_TAG;
 525             }
 526           pointer_offset += increment;
 527         }
 528     }
 529
 530   sctp_prepare_cookie_echo_chunk (sctp_conn, b0, &state_cookie);
 531
 532   /* Start the T1_COOKIE timer */
 533   sctp_timer_set (sctp_conn, sctp_pick_conn_idx_on_chunk (COOKIE_ECHO),
 534                   SCTP_TIMER_T1_COOKIE, sctp_conn->sub_conn[idx].RTO);
 535
 536   return SCTP_ERROR_NONE;
 537 }
 538
 539 /** Enqueue data out-of-order for delivery to application */
 540 always_inline int
 541 sctp_session_enqueue_data_ooo (sctp_connection_t * sctp_conn,
 542                                vlib_buffer_t * b, u16 data_len, u8 conn_idx)
 543 {
 544   int written, error = SCTP_ERROR_ENQUEUED;
 545
 546   written =
 547     session_enqueue_stream_connection (&sctp_conn->
 548                                        sub_conn[conn_idx].connection, b, 0,
 549                                        1 /* queue event */ ,
 550                                        0);
 551
 552   /* Update next_tsn_expected */
 553   if (PREDICT_TRUE (written == data_len))
 554     {
 555       sctp_conn->next_tsn_expected += written;
 556
 557       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 558                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 559                     written, data_len);
 560     }
 561   /* If more data written than expected, account for out-of-order bytes. */
 562   else if (written > data_len)
 563     {
 564       sctp_conn->next_tsn_expected += written;
 565
 566       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 567                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 568                     written, data_len);
 569     }
 570   else if (written > 0)
 571     {
 572       /* We've written something but FIFO is probably full now */
 573       sctp_conn->next_tsn_expected += written;
 574
 575       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 576
 577       SCTP_ADV_DBG
 578         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 579          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 580     }
 581   else
 582     {
 583       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 584                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 585
 586       return SCTP_ERROR_FIFO_FULL;
 587     }
 588
 589   /* TODO: Update out_of_order_map & SACK list */
 590
 591   return error;
 592 }
 593
 594 /** Enqueue data for delivery to application */
 595 always_inline int
 596 sctp_session_enqueue_data (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
 597                            u16 data_len, u8 conn_idx)
 598 {
 599   int written, error = SCTP_ERROR_ENQUEUED;
 600
 601   written =
 602     session_enqueue_stream_connection (&sctp_conn->
 603                                        sub_conn[conn_idx].connection, b, 0,
 604                                        1 /* queue event */ ,
 605                                        1);
 606
 607   /* Update next_tsn_expected */
 608   if (PREDICT_TRUE (written == data_len))
 609     {
 610       sctp_conn->next_tsn_expected += written;
 611
 612       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 613                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 614                     written, data_len);
 615     }
 616   /* If more data written than expected, account for out-of-order bytes. */
 617   else if (written > data_len)
 618     {
 619       sctp_conn->next_tsn_expected += written;
 620
 621       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 622                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 623                     written, data_len);
 624     }
 625   else if (written > 0)
 626     {
 627       /* We've written something but FIFO is probably full now */
 628       sctp_conn->next_tsn_expected += written;
 629
 630       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 631
 632       SCTP_ADV_DBG
 633         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 634          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 635     }
 636   else
 637     {
 638       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 639                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 640
 641       return SCTP_ERROR_FIFO_FULL;
 642     }
 643
 644   return error;
 645 }
 646
 647 always_inline u8
 648 sctp_is_sack_delayable (sctp_connection_t * sctp_conn, u8 gapping)
 649 {
 650   if (gapping != 0)
 651     {
 652       SCTP_CONN_TRACKING_DBG
 653         ("gapping != 0: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 654          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 655       return 1;
 656     }
 657
 658   if (sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS)
 659     {
 660       SCTP_CONN_TRACKING_DBG
 661         ("sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 662          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 663       return 1;
 664     }
 665
 666   sctp_conn->ack_state += 1;
 667
 668   return 0;
 669 }
 670
 671 always_inline void
 672 sctp_is_connection_gapping (sctp_connection_t * sctp_conn, u32 tsn,
 673                             u8 * gapping)
 674 {
 675   if (sctp_conn->next_tsn_expected != tsn)      // It means data transmission is GAPPING
 676     {
 677       SCTP_CONN_TRACKING_DBG
 678         ("GAPPING: CONN_INDEX = %u, sctp_conn->next_tsn_expected = %u, tsn = %u, diff = %u",
 679          sctp_conn->sub_conn[idx].connection.c_index,
 680          sctp_conn->next_tsn_expected, tsn,
 681          sctp_conn->next_tsn_expected - tsn);
 682
 683       *gapping = 1;
 684     }
 685 }
 686
 687 always_inline u16
 688 sctp_handle_data (sctp_payload_data_chunk_t * sctp_data_chunk,
 689                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b,
 690                   u16 * next0)
 691 {
 692   u32 error = 0, n_data_bytes;
 693   u8 is_gapping = 0;
 694
 695   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 696   if (sctp_conn->local_tag != sctp_data_chunk->sctp_hdr.verification_tag)
 697     {
 698       return SCTP_ERROR_INVALID_TAG;
 699     }
 700
 701   vnet_buffer (b)->sctp.sid = sctp_data_chunk->stream_id;
 702   vnet_buffer (b)->sctp.ssn = sctp_data_chunk->stream_seq;
 703
 704   u32 tsn = clib_net_to_host_u32 (sctp_data_chunk->tsn);
 705
 706   vlib_buffer_advance (b, vnet_buffer (b)->sctp.data_offset);
 707   n_data_bytes = vnet_buffer (b)->sctp.data_len;
 708   ASSERT (n_data_bytes);
 709
 710   sctp_is_connection_gapping (sctp_conn, tsn, &is_gapping);
 711
 712   sctp_conn->last_rcvd_tsn = tsn;
 713
 714   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 715
 716   u8 bbit = vnet_sctp_get_bbit (&sctp_data_chunk->chunk_hdr);
 717   u8 ebit = vnet_sctp_get_ebit (&sctp_data_chunk->chunk_hdr);
 718
 719   if (bbit == 1 && ebit == 1)   /* Unfragmented message */
 720     {
 721       /* In order data, enqueue. Fifo figures out by itself if any out-of-order
 722        * segments can be enqueued after fifo tail offset changes. */
 723       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 724     }
 725   else if (bbit == 1 && ebit == 0)      /* First piece of a fragmented user message */
 726     {
 727       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 728     }
 729   else if (bbit == 0 && ebit == 1)      /* Last piece of a fragmented user message */
 730     {
 731       if (PREDICT_FALSE (is_gapping == 1))
 732         error =
 733           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 734       else
 735         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 736     }
 737   else                          /* Middle piece of a fragmented user message */
 738     {
 739       if (PREDICT_FALSE (is_gapping == 1))
 740         error =
 741           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 742       else
 743         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 744     }
 745   sctp_conn->last_rcvd_tsn = tsn;
 746
 747   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 748
 749   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 750
 751   if (sctp_is_sack_delayable (sctp_conn, is_gapping) != 0)
 752     sctp_prepare_sack_chunk (sctp_conn, b);
 753
 754   return error;
 755 }
 756
 757 always_inline u16
 758 sctp_handle_cookie_echo (sctp_header_t * sctp_hdr,
 759                          sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 760                          sctp_connection_t * sctp_conn, u8 idx,
 761                          vlib_buffer_t * b0, u16 * next0)
 762 {
 763   u32 now = sctp_time_now ();
 764
 765   sctp_cookie_echo_chunk_t *cookie_echo =
 766     (sctp_cookie_echo_chunk_t *) sctp_hdr;
 767
 768   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 769   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 770     {
 771       return SCTP_ERROR_INVALID_TAG;
 772     }
 773
 774   sctp_calculate_rto (sctp_conn, idx);
 775
 776   u32 creation_time =
 777     clib_net_to_host_u32 (cookie_echo->cookie.creation_time);
 778   u32 cookie_lifespan =
 779     clib_net_to_host_u32 (cookie_echo->cookie.cookie_lifespan);
 780   if (now > creation_time + cookie_lifespan)
 781     {
 782       SCTP_DBG ("now (%u) > creation_time (%u) + cookie_lifespan (%u)",
 783                 now, creation_time, cookie_lifespan);
 784       return SCTP_ERROR_COOKIE_ECHO_VIOLATION;
 785     }
 786
 787   sctp_prepare_cookie_ack_chunk (sctp_conn, b0);
 788
 789   /* Change state */
 790   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 791   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 792
 793   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 794                   sctp_conn->sub_conn[idx].RTO);
 795
 796   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 797
 798   return SCTP_ERROR_NONE;
 799
 800 }
 801
 802 always_inline u16
 803 sctp_handle_cookie_ack (sctp_header_t * sctp_hdr,
 804                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 805                         sctp_connection_t * sctp_conn, u8 idx,
 806                         vlib_buffer_t * b0, u16 * next0)
 807 {
 808   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 809   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 810     {
 811       return SCTP_ERROR_INVALID_TAG;
 812     }
 813
 814   sctp_calculate_rto (sctp_conn, idx);
 815
 816   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_COOKIE);
 817   /* Change state */
 818   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 819   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 820
 821   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 822                   sctp_conn->sub_conn[idx].RTO);
 823
 824   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 825
 826   return SCTP_ERROR_NONE;
 827
 828 }
 829
 830 always_inline uword
 831 sctp46_rcv_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 832                          vlib_frame_t * from_frame, int is_ip4)
 833 {
 834   sctp_main_t *tm = vnet_get_sctp_main ();
 835
 836   u32 n_left_from, next_index, *from, *to_next;
 837   u32 my_thread_index = vm->thread_index;
 838
 839   from = vlib_frame_vector_args (from_frame);
 840   n_left_from = from_frame->n_vectors;
 841
 842   next_index = node->cached_next_index;
 843
 844   while (n_left_from > 0)
 845     {
 846       u32 n_left_to_next;
 847
 848       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 849
 850       while (n_left_from > 0 && n_left_to_next > 0)
 851         {
 852           u32 bi0;
 853           vlib_buffer_t *b0;
 854           sctp_header_t *sctp_hdr = 0;
 855           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
 856           ip4_header_t *ip4_hdr = 0;
 857           ip6_header_t *ip6_hdr = 0;
 858           sctp_connection_t *sctp_conn, *new_sctp_conn;
 859           u16 sctp_implied_length = 0;
 860           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
 861           u8 idx;
 862
 863           bi0 = from[0];
 864           to_next[0] = bi0;
 865           from += 1;
 866           to_next += 1;
 867           n_left_from -= 1;
 868           n_left_to_next -= 1;
 869
 870           b0 = vlib_get_buffer (vm, bi0);
 871
 872           /* If we are in SCTP_COOKIE_WAIT_STATE then the connection
 873            * will come from the half-open connections pool.
 874            */
 875           sctp_conn =
 876             sctp_half_open_connection_get (vnet_buffer (b0)->
 877                                            sctp.connection_index);
 878
 879           if (PREDICT_FALSE (sctp_conn == 0))
 880             {
 881               SCTP_ADV_DBG
 882                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
 883               error0 = SCTP_ERROR_INVALID_CONNECTION;
 884               goto drop;
 885             }
 886           if (is_ip4)
 887             {
 888               ip4_hdr = vlib_buffer_get_current (b0);
 889               sctp_hdr = ip4_next_header (ip4_hdr);
 890             }
 891           else
 892             {
 893               ip6_hdr = vlib_buffer_get_current (b0);
 894               sctp_hdr = ip6_next_header (ip6_hdr);
 895             }
 896           idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
 897
 898           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
 899
 900           transport_connection_t *trans_conn =
 901             &sctp_conn->sub_conn[idx].connection;
 902
 903           trans_conn->lcl_port = sctp_hdr->dst_port;
 904           trans_conn->rmt_port = sctp_hdr->src_port;
 905           trans_conn->is_ip4 = is_ip4;
 906
 907           if (is_ip4)
 908             {
 909               trans_conn->lcl_ip.ip4.as_u32 = ip4_hdr->dst_address.as_u32;
 910               trans_conn->rmt_ip.ip4.as_u32 = ip4_hdr->src_address.as_u32;
 911             }
 912           else
 913             {
 914               clib_memcpy (&trans_conn->lcl_ip.ip6, &ip6_hdr->dst_address,
 915                            sizeof (ip6_address_t));
 916               clib_memcpy (&trans_conn->rmt_ip.ip6, &ip6_hdr->src_address,
 917                            sizeof (ip6_address_t));
 918             }
 919
 920           sctp_chunk_hdr =
 921             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
 922
 923           sctp_implied_length =
 924             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
 925
 926           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
 927
 928           switch (chunk_type)
 929             {
 930             case INIT_ACK:
 931               error0 =
 932                 sctp_is_valid_init_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
 933                                         b0, sctp_implied_length);
 934
 935               if (error0 == SCTP_ERROR_NONE)
 936                 {
 937                   pool_get (tm->connections[my_thread_index], new_sctp_conn);
 938                   clib_memcpy (new_sctp_conn, sctp_conn,
 939                                sizeof (*new_sctp_conn));
 940                   new_sctp_conn->sub_conn[idx].c_c_index =
 941                     new_sctp_conn - tm->connections[my_thread_index];
 942                   new_sctp_conn->sub_conn[idx].c_thread_index =
 943                     my_thread_index;
 944                   new_sctp_conn->sub_conn[idx].parent = new_sctp_conn;
 945
 946                   if (sctp_half_open_connection_cleanup (sctp_conn))
 947                     {
 948                       SCTP_DBG
 949                         ("Cannot cleanup half-open connection; not the owning thread");
 950                     }
 951
 952                   sctp_connection_timers_init (new_sctp_conn);
 953
 954                   error0 =
 955                     sctp_handle_init_ack (sctp_hdr, sctp_chunk_hdr,
 956                                           new_sctp_conn, idx, b0,
 957                                           sctp_implied_length);
 958
 959                   sctp_init_mss (new_sctp_conn);
 960
 961                   if (session_stream_connect_notify
 962                       (&new_sctp_conn->sub_conn[idx].connection, 0))
 963                     {
 964                       SCTP_DBG
 965                         ("conn_index = %u: session_stream_connect_notify error; cleaning up connection",
 966                          new_sctp_conn->sub_conn[idx].connection.c_index);
 967                       sctp_connection_cleanup (new_sctp_conn);
 968                       goto drop;
 969                     }
 970                 }
 971               next0 = sctp_next_output (is_ip4);
 972               break;
 973
 974               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
 975                * are handled by the input-dispatcher function using the table-lookup
 976                * hence we should never get to the "default" case below.
 977                */
 978             default:
 979               error0 = SCTP_ERROR_UNKOWN_CHUNK;
 980               next0 = SCTP_NEXT_DROP;
 981               goto drop;
 982             }
 983
 984           if (error0 != SCTP_ERROR_NONE)
 985             {
 986               clib_warning ("error while parsing chunk");
 987               sctp_connection_cleanup (sctp_conn);
 988               next0 = SCTP_NEXT_DROP;
 989               goto drop;
 990             }
 991
 992         drop:
 993           b0->error = node->errors[error0];
 994           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 995             {
 996               sctp_rx_trace_t *t0 =
 997                 vlib_add_trace (vm, node, b0, sizeof (*t0));
 998               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
 999             }
1000
1001           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1002                                            n_left_to_next, bi0, next0);
1003         }
1004
1005       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1006     }
1007   return from_frame->n_vectors;
1008 }
1009
1010 static uword
1011 sctp4_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1012                  vlib_frame_t * from_frame)
1013 {
1014   return sctp46_rcv_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1015 }
1016
1017 static uword
1018 sctp6_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1019                  vlib_frame_t * from_frame)
1020 {
1021   return sctp46_rcv_phase_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1022 }
1023
1024 u8 *
1025 format_sctp_rx_trace_short (u8 * s, va_list * args)
1026 {
1027   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1028   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1029   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1030
1031   s = format (s, "%d -> %d (%U)",
1032               clib_net_to_host_u16 (t->sctp_header.src_port),
1033               clib_net_to_host_u16 (t->sctp_header.dst_port),
1034               format_sctp_state, t->sctp_connection.state);
1035
1036   return s;
1037 }
1038
1039 /* *INDENT-OFF* */
1040 VLIB_REGISTER_NODE (sctp4_rcv_phase_node) =
1041 {
1042   .function = sctp4_rcv_phase,
1043   .name = "sctp4-rcv",
1044   /* Takes a vector of packets. */
1045   .vector_size = sizeof (u32),
1046   .n_errors = SCTP_N_ERROR,
1047   .error_strings = sctp_error_strings,
1048   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1049   .next_nodes =
1050   {
1051 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1052     foreach_sctp_state_next
1053 #undef _
1054   },
1055   .format_trace = format_sctp_rx_trace_short,
1056 };
1057 /* *INDENT-ON* */
1058
1059 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_rcv_phase_node, sctp4_rcv_phase);
1060
1061 /* *INDENT-OFF* */
1062 VLIB_REGISTER_NODE (sctp6_init_phase_node) =
1063 {
1064   .function = sctp6_rcv_phase,
1065   .name = "sctp6-rcv",
1066   /* Takes a vector of packets. */
1067   .vector_size = sizeof (u32),
1068   .n_errors = SCTP_N_ERROR,
1069   .error_strings = sctp_error_strings,
1070   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1071   .next_nodes =
1072   {
1073 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1074     foreach_sctp_state_next
1075 #undef _
1076   },
1077   .format_trace = format_sctp_rx_trace_short,
1078 };
1079 /* *INDENT-ON* */
1080
1081 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_init_phase_node, sctp6_rcv_phase);
1082
1083 vlib_node_registration_t sctp4_shutdown_phase_node;
1084 vlib_node_registration_t sctp6_shutdown_phase_node;
1085
1086 always_inline u16
1087 sctp_handle_shutdown (sctp_header_t * sctp_hdr,
1088                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1089                       sctp_connection_t * sctp_conn, u8 idx,
1090                       vlib_buffer_t * b0, u16 sctp_implied_length,
1091                       u16 * next0)
1092 {
1093   sctp_shutdown_association_chunk_t *shutdown_chunk =
1094     (sctp_shutdown_association_chunk_t *) (sctp_hdr);
1095
1096   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1097   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1098     {
1099       return SCTP_ERROR_INVALID_TAG;
1100     }
1101
1102   /*
1103    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1104    */
1105   if (sctp_is_bundling (sctp_implied_length, &shutdown_chunk->chunk_hdr))
1106     return SCTP_ERROR_BUNDLING_VIOLATION;
1107
1108   switch (sctp_conn->state)
1109     {
1110     case SCTP_STATE_ESTABLISHED:
1111       if (sctp_check_outstanding_data_chunks (sctp_conn) == 0)
1112         sctp_conn->state = SCTP_STATE_SHUTDOWN_RECEIVED;
1113       sctp_send_shutdown_ack (sctp_conn, b0);
1114       break;
1115
1116     case SCTP_STATE_SHUTDOWN_SENT:
1117       sctp_send_shutdown_ack (sctp_conn, b0);
1118       break;
1119     }
1120
1121   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1122
1123   return SCTP_ERROR_NONE;
1124 }
1125
1126 always_inline u16
1127 sctp_handle_shutdown_ack (sctp_header_t * sctp_hdr,
1128                           sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1129                           sctp_connection_t * sctp_conn, u8 idx,
1130                           vlib_buffer_t * b0, u16 sctp_implied_length,
1131                           u16 * next0)
1132 {
1133   sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
1134     (sctp_shutdown_ack_chunk_t *) (sctp_hdr);
1135
1136   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1137   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1138     {
1139       return SCTP_ERROR_INVALID_TAG;
1140     }
1141
1142   /*
1143    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1144    */
1145   if (sctp_is_bundling (sctp_implied_length, &shutdown_ack_chunk->chunk_hdr))
1146     return SCTP_ERROR_BUNDLING_VIOLATION;
1147
1148   /* Whether we are in SCTP_STATE_SHUTDOWN_SENT or SCTP_STATE_SHUTDOWN_ACK_SENT
1149    * the reception of a SHUTDOWN_ACK chunk leads to the same actions:
1150    * - STOP T2_SHUTDOWN timer
1151    * - SEND SHUTDOWN_COMPLETE chunk
1152    */
1153   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1154                     SCTP_TIMER_T2_SHUTDOWN);
1155   sctp_send_shutdown_complete (sctp_conn);
1156
1157   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1158
1159   return SCTP_ERROR_NONE;
1160 }
1161
1162 always_inline u16
1163 sctp_handle_shutdown_complete (sctp_header_t * sctp_hdr,
1164                                sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1165                                sctp_connection_t * sctp_conn, u8 idx,
1166                                vlib_buffer_t * b0, u16 sctp_implied_length,
1167                                u16 * next0)
1168 {
1169   sctp_shutdown_complete_chunk_t *shutdown_complete =
1170     (sctp_shutdown_complete_chunk_t *) (sctp_hdr);
1171
1172   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1173   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1174     {
1175       return SCTP_ERROR_INVALID_TAG;
1176     }
1177
1178   /*
1179    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1180    */
1181   if (sctp_is_bundling (sctp_implied_length, &shutdown_complete->chunk_hdr))
1182     return SCTP_ERROR_BUNDLING_VIOLATION;
1183
1184   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1185                     SCTP_TIMER_T2_SHUTDOWN);
1186
1187   sctp_conn->state = SCTP_STATE_CLOSED;
1188
1189   stream_session_disconnect_notify (&sctp_conn->sub_conn
1190                                     [MAIN_SCTP_SUB_CONN_IDX].connection);
1191
1192   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
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           u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
1267
1268           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1269           switch (chunk_type)
1270             {
1271             case SHUTDOWN:
1272               error0 =
1273                 sctp_handle_shutdown (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1274                                       idx, b0, sctp_implied_length, &next0);
1275               break;
1276
1277             case SHUTDOWN_ACK:
1278               error0 =
1279                 sctp_handle_shutdown_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1280                                           idx, b0, sctp_implied_length,
1281                                           &next0);
1282               break;
1283
1284             case SHUTDOWN_COMPLETE:
1285               error0 =
1286                 sctp_handle_shutdown_complete (sctp_hdr, sctp_chunk_hdr,
1287                                                sctp_conn, idx, b0,
1288                                                sctp_implied_length, &next0);
1289
1290               sctp_connection_cleanup (sctp_conn);
1291               break;
1292
1293               /*
1294                * DATA chunks can still be transmitted/received in the SHUTDOWN-PENDING
1295                * and SHUTDOWN-SENT states (as per RFC4960 Section 6)
1296                */
1297             case DATA:
1298               error0 =
1299                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1300                                   sctp_conn, idx, b0, &next0);
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
1327               if (sctp_hdr != NULL)
1328                 clib_memcpy (&sctp_trace->sctp_header, sctp_hdr,
1329                              sizeof (sctp_trace->sctp_header));
1330
1331               if (sctp_conn != NULL)
1332                 clib_memcpy (&sctp_trace->sctp_connection, sctp_conn,
1333                              sizeof (sctp_trace->sctp_connection));
1334             }
1335
1336           b0->error = node->errors[error0];
1337
1338           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1339                                            n_left_to_next, bi0, next0);
1340         }
1341
1342       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1343     }
1344
1345   return from_frame->n_vectors;
1346
1347 }
1348
1349 static uword
1350 sctp4_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1351                       vlib_frame_t * from_frame)
1352 {
1353   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1354 }
1355
1356 static uword
1357 sctp6_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1358                       vlib_frame_t * from_frame)
1359 {
1360   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1361 }
1362
1363 /* *INDENT-OFF* */
1364 VLIB_REGISTER_NODE (sctp4_shutdown_phase_node) =
1365 {
1366   .function = sctp4_shutdown_phase,
1367   .name = "sctp4-shutdown",
1368   /* Takes a vector of packets. */
1369   .vector_size = sizeof (u32),
1370   .n_errors = SCTP_N_ERROR,
1371   .error_strings = sctp_error_strings,
1372   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1373   .next_nodes =
1374   {
1375 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1376     foreach_sctp_state_next
1377 #undef _
1378   },
1379   .format_trace = format_sctp_rx_trace_short,
1380 };
1381 /* *INDENT-ON* */
1382
1383 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_shutdown_phase_node,
1384                               sctp4_shutdown_phase);
1385
1386 /* *INDENT-OFF* */
1387 VLIB_REGISTER_NODE (sctp6_shutdown_phase_node) =
1388 {
1389   .function = sctp6_shutdown_phase,
1390   .name = "sctp6-shutdown",
1391   /* Takes a vector of packets. */
1392   .vector_size = sizeof (u32),
1393   .n_errors = SCTP_N_ERROR,
1394   .error_strings = sctp_error_strings,
1395   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1396   .next_nodes =
1397   {
1398 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1399     foreach_sctp_state_next
1400 #undef _
1401   },
1402   .format_trace = format_sctp_rx_trace_short,
1403 };
1404 /* *INDENT-ON* */
1405
1406 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_shutdown_phase_node,
1407                               sctp6_shutdown_phase);
1408
1409 vlib_node_registration_t sctp4_listen_phase_node;
1410 vlib_node_registration_t sctp6_listen_phase_node;
1411
1412 vlib_node_registration_t sctp4_established_phase_node;
1413 vlib_node_registration_t sctp6_established_phase_node;
1414
1415 always_inline u16
1416 sctp_handle_sack (sctp_selective_ack_chunk_t * sack_chunk,
1417                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b0,
1418                   u16 * next0)
1419 {
1420   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1421   if (sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag)
1422     {
1423       return SCTP_ERROR_INVALID_TAG;
1424     }
1425
1426   sctp_calculate_rto (sctp_conn, idx);
1427
1428   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1429                      sctp_conn->sub_conn[idx].RTO);
1430
1431   sctp_conn->sub_conn[idx].RTO_pending = 0;
1432
1433   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1434
1435   return SCTP_ERROR_NONE;
1436 }
1437
1438 always_inline u16
1439 sctp_handle_heartbeat (sctp_hb_req_chunk_t * sctp_hb_chunk,
1440                        sctp_connection_t * sctp_conn, u8 idx,
1441                        vlib_buffer_t * b0, u16 * next0)
1442 {
1443   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1444   if (sctp_conn->local_tag != sctp_hb_chunk->sctp_hdr.verification_tag)
1445     {
1446       return SCTP_ERROR_INVALID_TAG;
1447     }
1448
1449   sctp_prepare_heartbeat_ack_chunk (sctp_conn, b0);
1450
1451   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1452
1453   return SCTP_ERROR_NONE;
1454 }
1455
1456 always_inline u16
1457 sctp_handle_heartbeat_ack (sctp_hb_ack_chunk_t * sctp_hb_ack_chunk,
1458                            sctp_connection_t * sctp_conn, u8 idx,
1459                            vlib_buffer_t * b0, u16 * next0)
1460 {
1461   sctp_conn->sub_conn[idx].unacknowledged_hb -= 1;
1462
1463   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
1464                      sctp_conn->sub_conn[idx].RTO);
1465
1466   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1467
1468   return SCTP_ERROR_NONE;
1469 }
1470
1471 always_inline void
1472 sctp_node_inc_counter (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1473                        u8 is_ip4, u8 evt, u8 val)
1474 {
1475   if (PREDICT_TRUE (!val))
1476     return;
1477
1478   if (is_ip4)
1479     vlib_node_increment_counter (vm, tcp4_node, evt, val);
1480   else
1481     vlib_node_increment_counter (vm, tcp6_node, evt, val);
1482 }
1483
1484 always_inline uword
1485 sctp46_listen_process_inline (vlib_main_t * vm,
1486                               vlib_node_runtime_t * node,
1487                               vlib_frame_t * from_frame, int is_ip4)
1488 {
1489   u32 n_left_from, next_index, *from, *to_next;
1490   u32 my_thread_index = vm->thread_index;
1491
1492   from = vlib_frame_vector_args (from_frame);
1493   n_left_from = from_frame->n_vectors;
1494
1495   next_index = node->cached_next_index;
1496
1497   while (n_left_from > 0)
1498     {
1499       u32 n_left_to_next;
1500
1501       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1502
1503       while (n_left_from > 0 && n_left_to_next > 0)
1504         {
1505           u32 bi0;
1506           vlib_buffer_t *b0;
1507           sctp_header_t *sctp_hdr = 0;
1508           ip4_header_t *ip4_hdr;
1509           ip6_header_t *ip6_hdr;
1510           sctp_connection_t *child_conn;
1511           sctp_connection_t *sctp_listener;
1512           u16 next0 = SCTP_LISTEN_PHASE_N_NEXT, error0 = SCTP_ERROR_ENQUEUED;
1513
1514           bi0 = from[0];
1515           to_next[0] = bi0;
1516           from += 1;
1517           to_next += 1;
1518           n_left_from -= 1;
1519           n_left_to_next -= 1;
1520
1521           b0 = vlib_get_buffer (vm, bi0);
1522           sctp_listener =
1523             sctp_listener_get (vnet_buffer (b0)->sctp.connection_index);
1524
1525           if (is_ip4)
1526             {
1527               ip4_hdr = vlib_buffer_get_current (b0);
1528               sctp_hdr = ip4_next_header (ip4_hdr);
1529             }
1530           else
1531             {
1532               ip6_hdr = vlib_buffer_get_current (b0);
1533               sctp_hdr = ip6_next_header (ip6_hdr);
1534             }
1535
1536           child_conn =
1537             sctp_lookup_connection (sctp_listener->sub_conn
1538                                     [MAIN_SCTP_SUB_CONN_IDX].c_fib_index, b0,
1539                                     my_thread_index, is_ip4);
1540
1541           if (PREDICT_FALSE (child_conn->state != SCTP_STATE_CLOSED))
1542             {
1543               SCTP_DBG
1544                 ("conn_index = %u: child_conn->state != SCTP_STATE_CLOSED.... STATE=%s",
1545                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1546                  connection.c_index,
1547                  sctp_state_to_string (child_conn->state));
1548               error0 = SCTP_ERROR_CREATE_EXISTS;
1549               goto drop;
1550             }
1551
1552           /* Create child session and send SYN-ACK */
1553           child_conn = sctp_connection_new (my_thread_index);
1554           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = child_conn;
1555           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_port =
1556             sctp_hdr->dst_port;
1557           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_port =
1558             sctp_hdr->src_port;
1559           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_is_ip4 = is_ip4;
1560           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto =
1561             sctp_listener->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto;
1562           child_conn->state = SCTP_STATE_CLOSED;
1563
1564           if (is_ip4)
1565             {
1566               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip4.as_u32 =
1567                 ip4_hdr->dst_address.as_u32;
1568               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip4.as_u32 =
1569                 ip4_hdr->src_address.as_u32;
1570             }
1571           else
1572             {
1573               clib_memcpy (&child_conn->
1574                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip6,
1575                            &ip6_hdr->dst_address, sizeof (ip6_address_t));
1576               clib_memcpy (&child_conn->
1577                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip6,
1578                            &ip6_hdr->src_address, sizeof (ip6_address_t));
1579             }
1580
1581           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1582           sctp_chunks_common_hdr_t *sctp_chunk_hdr = &full_hdr->common_hdr;
1583
1584           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1585           if (chunk_type != INIT)
1586             {
1587               SCTP_DBG
1588                 ("conn_index = %u: chunk_type != INIT... chunk_type=%s",
1589                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1590                  connection.c_index, sctp_chunk_to_string (chunk_type));
1591
1592               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1593               next0 = SCTP_NEXT_DROP;
1594               goto drop;
1595             }
1596
1597           u16 sctp_implied_length =
1598             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1599
1600           switch (chunk_type)
1601             {
1602             case INIT:
1603               sctp_connection_timers_init (child_conn);
1604
1605               sctp_init_snd_vars (child_conn);
1606
1607               error0 =
1608                 sctp_handle_init (sctp_hdr, sctp_chunk_hdr, child_conn, b0,
1609                                   sctp_implied_length);
1610
1611               sctp_init_mss (child_conn);
1612
1613               if (error0 == SCTP_ERROR_NONE)
1614                 {
1615                   if (stream_session_accept
1616                       (&child_conn->
1617                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection,
1618                        sctp_listener->
1619                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_s_index, 0))
1620                     {
1621                       clib_warning ("session accept fail");
1622                       sctp_connection_cleanup (child_conn);
1623                       error0 = SCTP_ERROR_CREATE_SESSION_FAIL;
1624                       goto drop;
1625                     }
1626                 }
1627               next0 = sctp_next_output (is_ip4);
1628               break;
1629
1630               /* Reception of a DATA chunk whilst in the CLOSED state is called
1631                * "Out of the Blue" packet and handling of the chunk needs special treatment
1632                * as per RFC4960 section 8.4
1633                */
1634             case DATA:
1635               break;
1636             }
1637
1638         drop:
1639           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1640             {
1641               sctp_rx_trace_t *t0 =
1642                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1643               clib_memcpy (&t0->sctp_header, sctp_hdr,
1644                            sizeof (t0->sctp_header));
1645               clib_memcpy (&t0->sctp_connection, sctp_listener,
1646                            sizeof (t0->sctp_connection));
1647             }
1648
1649           b0->error = node->errors[error0];
1650
1651           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1652                                            n_left_to_next, bi0, next0);
1653         }
1654       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1655
1656     }
1657   return from_frame->n_vectors;
1658 }
1659
1660 static uword
1661 sctp4_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1662                     vlib_frame_t * from_frame)
1663 {
1664   return sctp46_listen_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1665 }
1666
1667 static uword
1668 sctp6_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1669                     vlib_frame_t * from_frame)
1670 {
1671   return sctp46_listen_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1672 }
1673
1674 always_inline uword
1675 sctp46_established_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1676                                  vlib_frame_t * from_frame, int is_ip4)
1677 {
1678   u32 n_left_from, next_index, *from, *to_next;
1679   u32 my_thread_index = vm->thread_index, errors = 0;
1680
1681   from = vlib_frame_vector_args (from_frame);
1682   n_left_from = from_frame->n_vectors;
1683
1684   next_index = node->cached_next_index;
1685
1686   while (n_left_from > 0)
1687     {
1688       u32 n_left_to_next;
1689
1690       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1691
1692       while (n_left_from > 0 && n_left_to_next > 0)
1693         {
1694           u32 bi0;
1695           vlib_buffer_t *b0;
1696           sctp_header_t *sctp_hdr = 0;
1697           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1698           ip4_header_t *ip4_hdr = 0;
1699           ip6_header_t *ip6_hdr = 0;
1700           sctp_connection_t *sctp_conn;
1701           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_ESTABLISHED_PHASE_N_NEXT;
1702           u8 idx;
1703
1704           bi0 = from[0];
1705           to_next[0] = bi0;
1706           from += 1;
1707           to_next += 1;
1708           n_left_from -= 1;
1709           n_left_to_next -= 1;
1710
1711           b0 = vlib_get_buffer (vm, bi0);
1712           sctp_conn =
1713             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1714                                  my_thread_index);
1715
1716           if (PREDICT_FALSE (sctp_conn == 0))
1717             {
1718               SCTP_DBG
1719                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1720               error0 = SCTP_ERROR_INVALID_CONNECTION;
1721               goto done;
1722             }
1723           if (is_ip4)
1724             {
1725               ip4_hdr = vlib_buffer_get_current (b0);
1726               sctp_hdr = ip4_next_header (ip4_hdr);
1727             }
1728           else
1729             {
1730               ip6_hdr = vlib_buffer_get_current (b0);
1731               sctp_hdr = ip6_next_header (ip6_hdr);
1732             }
1733
1734           idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
1735
1736           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1737
1738           transport_connection_t *trans_conn =
1739             &sctp_conn->sub_conn[idx].connection;
1740
1741           trans_conn->lcl_port = sctp_hdr->dst_port;
1742           trans_conn->rmt_port = sctp_hdr->src_port;
1743           trans_conn->is_ip4 = is_ip4;
1744
1745           sctp_conn->sub_conn[idx].parent = sctp_conn;
1746
1747           if (is_ip4)
1748             {
1749               trans_conn->lcl_ip.ip4.as_u32 = ip4_hdr->dst_address.as_u32;
1750               trans_conn->rmt_ip.ip4.as_u32 = ip4_hdr->src_address.as_u32;
1751             }
1752           else
1753             {
1754               clib_memcpy (&trans_conn->lcl_ip.ip6, &ip6_hdr->dst_address,
1755                            sizeof (ip6_address_t));
1756               clib_memcpy (&trans_conn->rmt_ip.ip6, &ip6_hdr->src_address,
1757                            sizeof (ip6_address_t));
1758             }
1759
1760           sctp_chunk_hdr =
1761             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
1762
1763           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1764
1765           switch (chunk_type)
1766             {
1767             case COOKIE_ECHO:
1768               error0 =
1769                 sctp_handle_cookie_echo (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1770                                          idx, b0, &next0);
1771               break;
1772
1773             case COOKIE_ACK:
1774               error0 =
1775                 sctp_handle_cookie_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1776                                         idx, b0, &next0);
1777               break;
1778
1779             case SACK:
1780               error0 =
1781                 sctp_handle_sack ((sctp_selective_ack_chunk_t *) sctp_hdr,
1782                                   sctp_conn, idx, b0, &next0);
1783               break;
1784
1785             case HEARTBEAT:
1786               error0 =
1787                 sctp_handle_heartbeat ((sctp_hb_req_chunk_t *) sctp_hdr,
1788                                        sctp_conn, idx, b0, &next0);
1789               break;
1790
1791             case HEARTBEAT_ACK:
1792               error0 =
1793                 sctp_handle_heartbeat_ack ((sctp_hb_ack_chunk_t *) sctp_hdr,
1794                                            sctp_conn, idx, b0, &next0);
1795               break;
1796
1797             case DATA:
1798               error0 =
1799                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1800                                   sctp_conn, idx, b0, &next0);
1801               break;
1802
1803               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1804                * are handled by the input-dispatcher function using the table-lookup
1805                * hence we should never get to the "default" case below.
1806                */
1807             default:
1808               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1809               next0 = SCTP_NEXT_DROP;
1810               goto done;
1811             }
1812
1813         done:
1814           b0->error = node->errors[error0];
1815           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1816             {
1817               sctp_rx_trace_t *t0 =
1818                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1819               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1820             }
1821
1822           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1823                                            n_left_to_next, bi0, next0);
1824         }
1825
1826       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1827     }
1828
1829   errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_SCTP,
1830                                                  my_thread_index);
1831
1832   sctp_node_inc_counter (vm, is_ip4, sctp4_established_phase_node.index,
1833                          sctp6_established_phase_node.index,
1834                          SCTP_ERROR_EVENT_FIFO_FULL, errors);
1835   sctp_flush_frame_to_output (vm, my_thread_index, is_ip4);
1836
1837   return from_frame->n_vectors;
1838 }
1839
1840 static uword
1841 sctp4_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1842                          vlib_frame_t * from_frame)
1843 {
1844   return sctp46_established_phase_inline (vm, node, from_frame,
1845                                           1 /* is_ip4 */ );
1846 }
1847
1848 static uword
1849 sctp6_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1850                          vlib_frame_t * from_frame)
1851 {
1852   return sctp46_established_phase_inline (vm, node, from_frame,
1853                                           0 /* is_ip4 */ );
1854 }
1855
1856 u8 *
1857 format_sctp_rx_trace (u8 * s, va_list * args)
1858 {
1859   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1860   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1861   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1862   u32 indent = format_get_indent (s);
1863
1864   s = format (s, "%U\n%U%U",
1865               format_sctp_header, &t->sctp_header, 128,
1866               format_white_space, indent,
1867               format_sctp_connection, &t->sctp_connection, 1);
1868
1869   return s;
1870 }
1871
1872 /* *INDENT-OFF* */
1873 VLIB_REGISTER_NODE (sctp4_listen_phase_node) =
1874 {
1875   .function = sctp4_listen_phase,
1876   .name = "sctp4-listen",
1877   /* Takes a vector of packets. */
1878   .vector_size = sizeof (u32),
1879   .n_errors = SCTP_N_ERROR,
1880   .error_strings = sctp_error_strings,
1881   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1882   .next_nodes =
1883   {
1884 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1885     foreach_sctp_state_next
1886 #undef _
1887   },
1888   .format_trace = format_sctp_rx_trace_short,
1889 };
1890 /* *INDENT-ON* */
1891
1892 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_listen_phase_node, sctp4_listen_phase);
1893
1894 /* *INDENT-OFF* */
1895 VLIB_REGISTER_NODE (sctp6_listen_phase_node) =
1896 {
1897   .function = sctp6_listen_phase,
1898   .name = "sctp6-listen",
1899   /* Takes a vector of packets. */
1900   .vector_size = sizeof (u32),
1901   .n_errors = SCTP_N_ERROR,
1902   .error_strings = sctp_error_strings,
1903   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1904   .next_nodes =
1905   {
1906 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1907     foreach_sctp_state_next
1908 #undef _
1909   },
1910   .format_trace = format_sctp_rx_trace_short,
1911 };
1912 /* *INDENT-ON* */
1913
1914 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_listen_phase_node, sctp6_listen_phase);
1915
1916 /* *INDENT-OFF* */
1917 VLIB_REGISTER_NODE (sctp4_established_phase_node) =
1918 {
1919   .function = sctp4_established_phase,
1920   .name = "sctp4-established",
1921   /* Takes a vector of packets. */
1922   .vector_size = sizeof (u32),
1923   .n_errors = SCTP_N_ERROR,
1924   .error_strings = sctp_error_strings,
1925   .n_next_nodes = SCTP_ESTABLISHED_PHASE_N_NEXT,
1926   .next_nodes =
1927   {
1928 #define _(s,n) [SCTP_ESTABLISHED_PHASE_NEXT_##s] = n,
1929     foreach_sctp_state_next
1930 #undef _
1931   },
1932   .format_trace = format_sctp_rx_trace_short,
1933 };
1934 /* *INDENT-ON* */
1935
1936 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_established_phase_node,
1937                               sctp4_established_phase);
1938
1939 /* *INDENT-OFF* */
1940 VLIB_REGISTER_NODE (sctp6_established_phase_node) =
1941 {
1942   .function = sctp6_established_phase,
1943   .name = "sctp6-established",
1944   /* Takes a vector of packets. */
1945   .vector_size = sizeof (u32),
1946   .n_errors = SCTP_N_ERROR,
1947   .error_strings = sctp_error_strings,
1948   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1949   .next_nodes =
1950   {
1951 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1952     foreach_sctp_state_next
1953 #undef _
1954   },
1955   .format_trace = format_sctp_rx_trace_short,
1956 };
1957 /* *INDENT-ON* */
1958
1959 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_established_phase_node,
1960                               sctp6_established_phase);
1961
1962 /*
1963  * This is the function executed first for the SCTP graph.
1964  * It takes care of doing the initial message parsing and
1965  * dispatch to the specialized function.
1966  */
1967 always_inline uword
1968 sctp46_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
1969                          vlib_frame_t * from_frame, int is_ip4)
1970 {
1971   u32 n_left_from, next_index, *from, *to_next;
1972   u32 my_thread_index = vm->thread_index;
1973   u8 is_filtered;
1974   sctp_main_t *tm = vnet_get_sctp_main ();
1975
1976   from = vlib_frame_vector_args (from_frame);
1977   n_left_from = from_frame->n_vectors;
1978   next_index = node->cached_next_index;
1979   sctp_set_time_now (my_thread_index);
1980
1981   while (n_left_from > 0)
1982     {
1983       u32 n_left_to_next;
1984
1985       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1986
1987       while (n_left_from > 0 && n_left_to_next > 0)
1988         {
1989           int n_advance_bytes0, n_data_bytes0;
1990           u32 bi0, fib_index0;
1991           vlib_buffer_t *b0;
1992           sctp_header_t *sctp_hdr = 0;
1993           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1994           sctp_connection_t *sctp_conn;
1995           transport_connection_t *trans_conn;
1996           ip4_header_t *ip4_hdr;
1997           ip6_header_t *ip6_hdr;
1998           u32 error0 = SCTP_ERROR_NO_LISTENER, next0 = SCTP_INPUT_NEXT_DROP;
1999
2000           bi0 = from[0];
2001           to_next[0] = bi0;
2002           from += 1;
2003           to_next += 1;
2004           n_left_from -= 1;
2005           n_left_to_next -= 1;
2006
2007           b0 = vlib_get_buffer (vm, bi0);
2008           vnet_buffer (b0)->tcp.flags = 0;
2009           fib_index0 = vnet_buffer (b0)->ip.fib_index;
2010
2011           /* Checksum computed by ipx_local no need to compute again */
2012
2013           if (is_ip4)
2014             {
2015               ip4_hdr = vlib_buffer_get_current (b0);
2016               sctp_hdr = ip4_next_header (ip4_hdr);
2017
2018               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2019               sctp_chunk_hdr = &full_hdr->common_hdr;
2020
2021               n_advance_bytes0 =
2022                 (ip4_header_bytes (ip4_hdr) +
2023                  sizeof (sctp_payload_data_chunk_t));
2024               n_data_bytes0 =
2025                 clib_net_to_host_u16 (ip4_hdr->length) - n_advance_bytes0;
2026
2027               trans_conn = session_lookup_connection_wt4 (fib_index0,
2028                                                           &ip4_hdr->dst_address,
2029                                                           &ip4_hdr->src_address,
2030                                                           sctp_hdr->dst_port,
2031                                                           sctp_hdr->src_port,
2032                                                           TRANSPORT_PROTO_SCTP,
2033                                                           my_thread_index,
2034                                                           &is_filtered);
2035             }
2036           else
2037             {
2038               ip6_hdr = vlib_buffer_get_current (b0);
2039               sctp_hdr = ip6_next_header (ip6_hdr);
2040
2041               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2042               sctp_chunk_hdr = &full_hdr->common_hdr;
2043
2044               n_advance_bytes0 = sctp_header_bytes ();
2045               n_data_bytes0 =
2046                 clib_net_to_host_u16 (ip6_hdr->payload_length) -
2047                 n_advance_bytes0;
2048               n_advance_bytes0 += sizeof (ip6_hdr[0]);
2049
2050               trans_conn = session_lookup_connection_wt6 (fib_index0,
2051                                                           &ip6_hdr->dst_address,
2052                                                           &ip6_hdr->src_address,
2053                                                           sctp_hdr->dst_port,
2054                                                           sctp_hdr->src_port,
2055                                                           TRANSPORT_PROTO_SCTP,
2056                                                           my_thread_index,
2057                                                           &is_filtered);
2058             }
2059
2060           /* Length check */
2061           if (PREDICT_FALSE (n_advance_bytes0 < 0))
2062             {
2063               error0 = SCTP_ERROR_LENGTH;
2064               goto done;
2065             }
2066
2067           sctp_conn = sctp_get_connection_from_transport (trans_conn);
2068           vnet_sctp_common_hdr_params_net_to_host (sctp_chunk_hdr);
2069
2070           u8 type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
2071 #if SCTP_DEBUG_STATE_MACHINE
2072           u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
2073 #endif
2074           vnet_buffer (b0)->sctp.hdr_offset =
2075             (u8 *) sctp_hdr - (u8 *) vlib_buffer_get_current (b0);
2076
2077           /* Session exists */
2078           if (PREDICT_TRUE (0 != sctp_conn))
2079             {
2080               /* Save connection index */
2081               vnet_buffer (b0)->sctp.connection_index = trans_conn->c_index;
2082               vnet_buffer (b0)->sctp.data_offset = n_advance_bytes0;
2083               vnet_buffer (b0)->sctp.data_len = n_data_bytes0;
2084
2085               next0 = tm->dispatch_table[sctp_conn->state][type].next;
2086               error0 = tm->dispatch_table[sctp_conn->state][type].error;
2087
2088               SCTP_DBG_STATE_MACHINE ("CONNECTION_INDEX = %u: "
2089                                       "CURRENT_CONNECTION_STATE = %s,"
2090                                       "CHUNK_TYPE_RECEIVED = %s "
2091                                       "NEXT_PHASE = %s",
2092                                       sctp_conn->sub_conn
2093                                       [idx].connection.c_index,
2094                                       sctp_state_to_string (sctp_conn->state),
2095                                       sctp_chunk_to_string (type),
2096                                       phase_to_string (next0));
2097
2098               if (type == DATA)
2099                 SCTP_ADV_DBG ("n_advance_bytes0 = %u, n_data_bytes0 = %u",
2100                               n_advance_bytes0, n_data_bytes0);
2101
2102             }
2103           else
2104             {
2105               if (is_filtered)
2106                 {
2107                   next0 = SCTP_INPUT_NEXT_DROP;
2108                   error0 = SCTP_ERROR_FILTERED;
2109                 }
2110               else if ((is_ip4 && tm->punt_unknown4) ||
2111                        (!is_ip4 && tm->punt_unknown6))
2112                 {
2113                   next0 = SCTP_INPUT_NEXT_PUNT_PHASE;
2114                   error0 = SCTP_ERROR_PUNT;
2115                 }
2116               else
2117                 {
2118                   next0 = SCTP_INPUT_NEXT_DROP;
2119                   error0 = SCTP_ERROR_NO_LISTENER;
2120                 }
2121               SCTP_DBG_STATE_MACHINE ("sctp_conn == NULL, NEXT_PHASE = %s",
2122                                       phase_to_string (next0));
2123               sctp_conn = 0;
2124             }
2125
2126         done:
2127           b0->error = error0 ? node->errors[error0] : 0;
2128
2129           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2130             {
2131               sctp_rx_trace_t *t0 =
2132                 vlib_add_trace (vm, node, b0, sizeof (*t0));
2133               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
2134             }
2135           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2136                                            n_left_to_next, bi0, next0);
2137         }
2138
2139       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2140     }
2141   return from_frame->n_vectors;
2142 }
2143
2144 static uword
2145 sctp4_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2146                         vlib_frame_t * from_frame)
2147 {
2148   return sctp46_input_dispatcher (vm, node, from_frame, 1 /* is_ip4 */ );
2149 }
2150
2151 static uword
2152 sctp6_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2153                         vlib_frame_t * from_frame)
2154 {
2155   return sctp46_input_dispatcher (vm, node, from_frame, 0 /* is_ip4 */ );
2156 }
2157
2158 /* *INDENT-OFF* */
2159 VLIB_REGISTER_NODE (sctp4_input_node) =
2160 {
2161   .function = sctp4_input_dispatcher,
2162   .name = "sctp4-input",
2163   /* Takes a vector of packets. */
2164   .vector_size = sizeof (u32),
2165   .n_errors = SCTP_N_ERROR,
2166   .error_strings = sctp_error_strings,
2167   .n_next_nodes = SCTP_INPUT_N_NEXT,
2168   .next_nodes =
2169   {
2170 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2171     foreach_sctp4_input_next
2172 #undef _
2173   },
2174   .format_buffer = format_sctp_header,
2175   .format_trace = format_sctp_rx_trace,
2176 };
2177 /* *INDENT-ON* */
2178
2179 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_input_node, sctp4_input_dispatcher);
2180
2181 /* *INDENT-OFF* */
2182 VLIB_REGISTER_NODE (sctp6_input_node) =
2183 {
2184   .function = sctp6_input_dispatcher,
2185   .name = "sctp6-input",
2186   /* Takes a vector of packets. */
2187   .vector_size = sizeof (u32),
2188   .n_errors = SCTP_N_ERROR,
2189   .error_strings = sctp_error_strings,
2190   .n_next_nodes = SCTP_INPUT_N_NEXT,
2191   .next_nodes =
2192   {
2193 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2194     foreach_sctp6_input_next
2195 #undef _
2196   },
2197   .format_buffer = format_sctp_header,
2198   .format_trace = format_sctp_rx_trace,
2199 };
2200 /* *INDENT-ON* */
2201
2202 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_input_node, sctp6_input_dispatcher);
2203
2204 vlib_node_registration_t sctp4_input_node;
2205 vlib_node_registration_t sctp6_input_node;
2206
2207 static void
2208 sctp_dispatch_table_init (sctp_main_t * tm)
2209 {
2210   int i, j;
2211   for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
2212     for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
2213       {
2214         tm->dispatch_table[i][j].next = SCTP_INPUT_NEXT_DROP;
2215         tm->dispatch_table[i][j].error = SCTP_ERROR_DISPATCH;
2216       }
2217
2218 #define _(t,f,n,e)                                              \
2219 do {                                                            \
2220     tm->dispatch_table[SCTP_STATE_##t][f].next = (n);           \
2221     tm->dispatch_table[SCTP_STATE_##t][f].error = (e);          \
2222 } while (0)
2223
2224   /*
2225    * SCTP STATE-MACHINE states:
2226    *
2227    * _(CLOSED, "CLOSED")                         \
2228    * _(COOKIE_WAIT, "COOKIE_WAIT")               \
2229    * _(COOKIE_ECHOED, "COOKIE_ECHOED")           \
2230    * _(ESTABLISHED, "ESTABLISHED")               \
2231    * _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING")     \
2232    * _(SHUTDOWN_SENT, "SHUTDOWN_SENT")           \
2233    * _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED")   \
2234    * _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
2235    */
2236   _(CLOSED, DATA, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);       /* UNEXPECTED DATA chunk which requires special handling */
2237   _(CLOSED, INIT, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2238   _(CLOSED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);        /* UNEXPECTED INIT_ACK chunk */
2239   _(CLOSED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);       /* UNEXPECTED SACK chunk */
2240   _(CLOSED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT chunk */
2241   _(CLOSED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT_ACK chunk */
2242   _(CLOSED, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2243   _(CLOSED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN chunk */
2244   _(CLOSED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN_ACK chunk */
2245   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);       /* UNEXPECTED OPERATION_ERROR chunk */
2246   _(CLOSED, COOKIE_ECHO, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2247   _(CLOSED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED COOKIE_ACK chunk */
2248   _(CLOSED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);     /* UNEXPECTED ECNE chunk */
2249   _(CLOSED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);       /* UNEXPECTED CWR chunk */
2250   _(CLOSED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);   /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2251
2252   _(COOKIE_WAIT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2253   _(COOKIE_WAIT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED INIT chunk which requires special handling */
2254   _(COOKIE_WAIT, INIT_ACK, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2255   _(COOKIE_WAIT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);  /* UNEXPECTED SACK chunk */
2256   _(COOKIE_WAIT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT chunk */
2257   _(COOKIE_WAIT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT_ACK chunk */
2258   _(COOKIE_WAIT, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2259   _(COOKIE_WAIT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN chunk */
2260   _(COOKIE_WAIT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2261   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2262   _(COOKIE_WAIT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2263   _(COOKIE_WAIT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2264   _(COOKIE_WAIT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2265   _(COOKIE_WAIT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2266   _(COOKIE_WAIT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2267
2268   _(COOKIE_ECHOED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2269   _(COOKIE_ECHOED, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);   /* UNEXPECTED INIT chunk which requires special handling */
2270   _(COOKIE_ECHOED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2271   _(COOKIE_ECHOED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2272   _(COOKIE_ECHOED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2273   _(COOKIE_ECHOED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2274   _(COOKIE_ECHOED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2275   _(COOKIE_ECHOED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN chunk */
2276   _(COOKIE_ECHOED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN_ACK chunk */
2277   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);        /* UNEXPECTED OPERATION_ERROR chunk */
2278   _(COOKIE_ECHOED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2279   _(COOKIE_ECHOED, COOKIE_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2280     SCTP_ERROR_NONE);
2281   _(COOKIE_ECHOED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2282   _(COOKIE_ECHOED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2283   _(COOKIE_ECHOED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2284
2285   _(ESTABLISHED, DATA, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2286   _(ESTABLISHED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);  /* UNEXPECTED INIT chunk */
2287   _(ESTABLISHED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED INIT_ACK chunk */
2288   _(ESTABLISHED, SACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2289   _(ESTABLISHED, HEARTBEAT, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2290     SCTP_ERROR_NONE);
2291   _(ESTABLISHED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2292     SCTP_ERROR_NONE);
2293   _(ESTABLISHED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);        /* UNEXPECTED ABORT chunk */
2294   _(ESTABLISHED, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2295   _(ESTABLISHED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2296   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2297   _(ESTABLISHED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2298   _(ESTABLISHED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2299   _(ESTABLISHED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2300   _(ESTABLISHED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2301   _(ESTABLISHED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2302
2303   _(SHUTDOWN_PENDING, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2304   _(SHUTDOWN_PENDING, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);     /* UNEXPECTED INIT chunk */
2305   _(SHUTDOWN_PENDING, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED INIT_ACK chunk */
2306   _(SHUTDOWN_PENDING, SACK, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2307   _(SHUTDOWN_PENDING, HEARTBEAT, SCTP_INPUT_NEXT_LISTEN_PHASE,
2308     SCTP_ERROR_NONE);
2309   _(SHUTDOWN_PENDING, HEARTBEAT_ACK, SCTP_INPUT_NEXT_LISTEN_PHASE,
2310     SCTP_ERROR_NONE);
2311   _(SHUTDOWN_PENDING, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);   /* UNEXPECTED ABORT chunk */
2312   _(SHUTDOWN_PENDING, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2313     SCTP_ERROR_NONE);
2314   _(SHUTDOWN_PENDING, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);     /* UNEXPECTED SHUTDOWN_ACK chunk */
2315   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);     /* UNEXPECTED OPERATION_ERROR chunk */
2316   _(SHUTDOWN_PENDING, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);     /* UNEXPECTED COOKIE_ECHO chunk */
2317   _(SHUTDOWN_PENDING, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);    /* UNEXPECTED COOKIE_ACK chunk */
2318   _(SHUTDOWN_PENDING, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);   /* UNEXPECTED ECNE chunk */
2319   _(SHUTDOWN_PENDING, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);     /* UNEXPECTED CWR chunk */
2320   _(SHUTDOWN_PENDING, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION); /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2321
2322   _(SHUTDOWN_SENT, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2323   _(SHUTDOWN_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);        /* UNEXPECTED INIT chunk */
2324   _(SHUTDOWN_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2325   _(SHUTDOWN_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2326   _(SHUTDOWN_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2327   _(SHUTDOWN_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2328   _(SHUTDOWN_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2329   _(SHUTDOWN_SENT, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2330   _(SHUTDOWN_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2331     SCTP_ERROR_NONE);
2332   _(SHUTDOWN_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2333   _(SHUTDOWN_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);       /* UNEXPECTED COOKIE_ACK chunk */
2334   _(SHUTDOWN_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2335   _(SHUTDOWN_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2336   _(SHUTDOWN_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2337
2338   _(SHUTDOWN_RECEIVED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2339   _(SHUTDOWN_RECEIVED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2340   _(SHUTDOWN_RECEIVED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2341   _(SHUTDOWN_RECEIVED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2342   _(SHUTDOWN_RECEIVED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2343   _(SHUTDOWN_RECEIVED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2344   _(SHUTDOWN_RECEIVED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2345   _(SHUTDOWN_RECEIVED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2346   _(SHUTDOWN_RECEIVED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2347     SCTP_ERROR_NONE);
2348   _(SHUTDOWN_RECEIVED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2349   _(SHUTDOWN_RECEIVED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2350   _(SHUTDOWN_RECEIVED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2351   _(SHUTDOWN_RECEIVED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2352   _(SHUTDOWN_RECEIVED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);        /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2353
2354   _(SHUTDOWN_ACK_SENT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2355   _(SHUTDOWN_ACK_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2356   _(SHUTDOWN_ACK_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2357   _(SHUTDOWN_ACK_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2358   _(SHUTDOWN_ACK_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2359   _(SHUTDOWN_ACK_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2360   _(SHUTDOWN_ACK_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2361   _(SHUTDOWN_ACK_SENT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2362   _(SHUTDOWN_ACK_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN_ACK chunk */
2363   _(SHUTDOWN_ACK_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2364   _(SHUTDOWN_ACK_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2365   _(SHUTDOWN_ACK_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2366   _(SHUTDOWN_ACK_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2367   _(SHUTDOWN_ACK_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2368     SCTP_ERROR_NONE);
2369
2370   /* TODO: Handle COOKIE ECHO when a TCB Exists */
2371
2372 #undef _
2373 }
2374
2375 clib_error_t *
2376 sctp_input_init (vlib_main_t * vm)
2377 {
2378   clib_error_t *error = 0;
2379   sctp_main_t *tm = vnet_get_sctp_main ();
2380
2381   if ((error = vlib_call_init_function (vm, sctp_init)))
2382     return error;
2383
2384   /* Initialize dispatch table. */
2385   sctp_dispatch_table_init (tm);
2386
2387   return error;
2388 }
2389
2390 VLIB_INIT_FUNCTION (sctp_input_init);
2391
2392 /*
2393  * fd.io coding-style-patch-verification: ON
2394  *
2395  * Local Variables:
2396  * eval: (c-set-style "gnu")
2397  * End:
2398  */