src/vnet/sctp/sctp_input.c

   1 /*
   2  * Copyright (c) 2017 SUSE LLC.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #include <vppinfra/sparse_vec.h>
  16 #include <vnet/sctp/sctp.h>
  17 #include <vnet/sctp/sctp_packet.h>
  18 #include <vnet/sctp/sctp_debug.h>
  19 #include <vnet/session/session.h>
  20 #include <math.h>
  21
  22 static char *sctp_error_strings[] = {
  23 #define sctp_error(n,s) s,
  24 #include <vnet/sctp/sctp_error.def>
  25 #undef sctp_error
  26 };
  27
  28 /* All SCTP nodes have the same outgoing arcs */
  29 #define foreach_sctp_state_next                  \
  30   _ (DROP4, "ip4-drop")                         \
  31   _ (DROP6, "ip6-drop")                         \
  32   _ (SCTP4_OUTPUT, "sctp4-output")                \
  33   _ (SCTP6_OUTPUT, "sctp6-output")
  34
  35 typedef enum _sctp_established_phase_next
  36 {
  37 #define _(s,n) SCTP_ESTABLISHED_PHASE_NEXT_##s,
  38   foreach_sctp_state_next
  39 #undef _
  40     SCTP_ESTABLISHED_PHASE_N_NEXT,
  41 } sctp_established_phase_next_t;
  42
  43 typedef enum _sctp_rcv_phase_next
  44 {
  45 #define _(s,n) SCTP_RCV_PHASE_NEXT_##s,
  46   foreach_sctp_state_next
  47 #undef _
  48     SCTP_RCV_PHASE_N_NEXT,
  49 } sctp_rcv_phase_next_t;
  50
  51 typedef enum _sctp_listen_phase_next
  52 {
  53 #define _(s,n) SCTP_LISTEN_PHASE_NEXT_##s,
  54   foreach_sctp_state_next
  55 #undef _
  56     SCTP_LISTEN_PHASE_N_NEXT,
  57 } sctp_listen_phase_next_t;
  58
  59 typedef enum _sctp_shutdown_phase_next
  60 {
  61 #define _(s,n) SCTP_SHUTDOWN_PHASE_NEXT_##s,
  62   foreach_sctp_state_next
  63 #undef _
  64     SCTP_SHUTDOWN_PHASE_N_NEXT,
  65 } sctp_shutdown_phase_next_t;
  66
  67 /* Generic, state independent indices */
  68 typedef enum _sctp_state_next
  69 {
  70 #define _(s,n) SCTP_NEXT_##s,
  71   foreach_sctp_state_next
  72 #undef _
  73     SCTP_STATE_N_NEXT,
  74 } sctp_state_next_t;
  75
  76 typedef enum _sctp_input_next
  77 {
  78   SCTP_INPUT_NEXT_DROP,
  79   SCTP_INPUT_NEXT_LISTEN_PHASE,
  80   SCTP_INPUT_NEXT_RCV_PHASE,
  81   SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
  82   SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
  83   SCTP_INPUT_NEXT_PUNT_PHASE,
  84   SCTP_INPUT_N_NEXT
  85 } sctp_input_next_t;
  86
  87 char *
  88 phase_to_string (u8 phase)
  89 {
  90   switch (phase)
  91     {
  92     case SCTP_INPUT_NEXT_DROP:
  93       return "SCTP_INPUT_NEXT_DROP";
  94     case SCTP_INPUT_NEXT_LISTEN_PHASE:
  95       return "SCTP_INPUT_NEXT_LISTEN_PHASE";
  96     case SCTP_INPUT_NEXT_RCV_PHASE:
  97       return "SCTP_INPUT_NEXT_RCV_PHASE";
  98     case SCTP_INPUT_NEXT_ESTABLISHED_PHASE:
  99       return "SCTP_INPUT_NEXT_ESTABLISHED_PHASE";
 100     case SCTP_INPUT_NEXT_SHUTDOWN_PHASE:
 101       return "SCTP_INPUT_NEXT_SHUTDOWN_PHASE";
 102     case SCTP_INPUT_NEXT_PUNT_PHASE:
 103       return "SCTP_INPUT_NEXT_PUNT_PHASE";
 104     }
 105   return NULL;
 106 }
 107
 108 #define foreach_sctp4_input_next                 \
 109   _ (DROP, "error-drop")                         \
 110   _ (RCV_PHASE, "sctp4-rcv")                    \
 111   _ (LISTEN_PHASE, "sctp4-listen")       \
 112   _ (ESTABLISHED_PHASE, "sctp4-established")             \
 113   _ (SHUTDOWN_PHASE, "sctp4-shutdown")  \
 114   _ (PUNT_PHASE, "ip4-punt")
 115
 116
 117 #define foreach_sctp6_input_next                 \
 118   _ (DROP, "error-drop")                         \
 119   _ (RCV_PHASE, "sctp6-rcv")                    \
 120   _ (LISTEN_PHASE, "sctp6-listen")       \
 121   _ (ESTABLISHED_PHASE, "sctp6-established")             \
 122   _ (SHUTDOWN_PHASE, "sctp6-shutdown")          \
 123   _ (PUNT_PHASE, "ip6-punt")
 124
 125 static u8
 126 sctp_lookup_is_valid (transport_connection_t * trans_conn,
 127                       sctp_header_t * sctp_hdr)
 128 {
 129   sctp_connection_t *sctp_conn =
 130     sctp_get_connection_from_transport (trans_conn);
 131
 132   if (!sctp_conn)
 133     return 1;
 134
 135   u8 is_valid = (trans_conn->lcl_port == sctp_hdr->dst_port
 136                  && (sctp_conn->state == SCTP_STATE_CLOSED
 137                      || trans_conn->rmt_port == sctp_hdr->src_port));
 138
 139   return is_valid;
 140 }
 141
 142 /**
 143  * Lookup transport connection
 144  */
 145 static sctp_connection_t *
 146 sctp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
 147                         u8 is_ip4)
 148 {
 149   sctp_main_t *tm = vnet_get_sctp_main ();
 150   sctp_header_t *sctp_hdr;
 151   transport_connection_t *trans_conn;
 152   sctp_connection_t *sctp_conn;
 153   u8 is_filtered, i;
 154   if (is_ip4)
 155     {
 156       ip4_header_t *ip4_hdr;
 157       ip4_hdr = vlib_buffer_get_current (b);
 158       sctp_hdr = ip4_next_header (ip4_hdr);
 159       trans_conn = session_lookup_connection_wt4 (fib_index,
 160                                                   &ip4_hdr->dst_address,
 161                                                   &ip4_hdr->src_address,
 162                                                   sctp_hdr->dst_port,
 163                                                   sctp_hdr->src_port,
 164                                                   TRANSPORT_PROTO_SCTP,
 165                                                   thread_index, &is_filtered);
 166       if (trans_conn == 0)      /* Not primary connection */
 167         {
 168           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 169             {
 170               if ((tm->connections[thread_index]->sub_conn[i].
 171                    connection.lcl_ip.ip4.as_u32 ==
 172                    ip4_hdr->dst_address.as_u32)
 173                   && (tm->connections[thread_index]->sub_conn[i].
 174                       connection.rmt_ip.ip4.as_u32 ==
 175                       ip4_hdr->src_address.as_u32))
 176                 {
 177                   trans_conn =
 178                     &tm->connections[thread_index]->sub_conn[i].connection;
 179                   break;
 180                 }
 181             }
 182         }
 183       ASSERT (trans_conn != 0);
 184       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 185     }
 186   else
 187     {
 188       ip6_header_t *ip6_hdr;
 189       ip6_hdr = vlib_buffer_get_current (b);
 190       sctp_hdr = ip6_next_header (ip6_hdr);
 191       trans_conn = session_lookup_connection_wt6 (fib_index,
 192                                                   &ip6_hdr->dst_address,
 193                                                   &ip6_hdr->src_address,
 194                                                   sctp_hdr->dst_port,
 195                                                   sctp_hdr->src_port,
 196                                                   TRANSPORT_PROTO_SCTP,
 197                                                   thread_index, &is_filtered);
 198       if (trans_conn == 0)      /* Not primary connection */
 199         {
 200           for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
 201             {
 202               if ((tm->connections[thread_index]->sub_conn[i].
 203                    connection.lcl_ip.ip6.as_u64[0] ==
 204                    ip6_hdr->dst_address.as_u64[0]
 205                    && tm->connections[thread_index]->sub_conn[i].
 206                    connection.lcl_ip.ip6.as_u64[1] ==
 207                    ip6_hdr->dst_address.as_u64[1])
 208                   && (tm->connections[thread_index]->sub_conn[i].
 209                       connection.rmt_ip.ip6.as_u64[0] ==
 210                       ip6_hdr->src_address.as_u64[0]
 211                       && tm->connections[thread_index]->
 212                       sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
 213                       ip6_hdr->src_address.as_u64[1]))
 214                 {
 215                   trans_conn =
 216                     &tm->connections[thread_index]->sub_conn[i].connection;
 217                   break;
 218                 }
 219             }
 220         }
 221       ASSERT (trans_conn != 0);
 222       ASSERT (sctp_lookup_is_valid (trans_conn, sctp_hdr));
 223     }
 224   sctp_conn = sctp_get_connection_from_transport (trans_conn);
 225   return sctp_conn;
 226 }
 227
 228 typedef struct
 229 {
 230   sctp_header_t sctp_header;
 231   sctp_connection_t sctp_connection;
 232 } sctp_rx_trace_t;
 233
 234 #define sctp_next_output(is_ip4) (is_ip4 ? SCTP_NEXT_SCTP4_OUTPUT          \
 235                                         : SCTP_NEXT_SCTP6_OUTPUT)
 236
 237 #define sctp_next_drop(is_ip4) (is_ip4 ? SCTP_NEXT_DROP4                  \
 238                                       : SCTP_NEXT_DROP6)
 239
 240 void
 241 sctp_set_rx_trace_data (sctp_rx_trace_t * rx_trace,
 242                         sctp_connection_t * sctp_conn,
 243                         sctp_header_t * sctp_hdr, vlib_buffer_t * b0,
 244                         u8 is_ip4)
 245 {
 246   if (sctp_conn)
 247     {
 248       clib_memcpy (&rx_trace->sctp_connection, sctp_conn,
 249                    sizeof (rx_trace->sctp_connection));
 250     }
 251   else
 252     {
 253       sctp_hdr = sctp_buffer_hdr (b0);
 254     }
 255   clib_memcpy (&rx_trace->sctp_header, sctp_hdr,
 256                sizeof (rx_trace->sctp_header));
 257 }
 258
 259 always_inline u16
 260 sctp_calculate_implied_length (ip4_header_t * ip4_hdr, ip6_header_t * ip6_hdr,
 261                                int is_ip4)
 262 {
 263   u16 sctp_implied_packet_length = 0;
 264
 265   if (is_ip4)
 266     sctp_implied_packet_length =
 267       clib_net_to_host_u16 (ip4_hdr->length) - ip4_header_bytes (ip4_hdr);
 268   else
 269     sctp_implied_packet_length =
 270       clib_net_to_host_u16 (ip6_hdr->payload_length) - sizeof (ip6_hdr);
 271
 272   return sctp_implied_packet_length;
 273 }
 274
 275 always_inline u8
 276 sctp_is_bundling (u16 sctp_implied_length,
 277                   sctp_chunks_common_hdr_t * sctp_common_hdr)
 278 {
 279   if (sctp_implied_length !=
 280       sizeof (sctp_header_t) + vnet_sctp_get_chunk_length (sctp_common_hdr))
 281     return 1;
 282   return 0;
 283 }
 284
 285 always_inline u16
 286 sctp_handle_init (sctp_header_t * sctp_hdr,
 287                   sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 288                   sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 289                   u16 sctp_implied_length)
 290 {
 291   sctp_init_chunk_t *init_chunk = (sctp_init_chunk_t *) (sctp_hdr);
 292   ip4_address_t *ip4_addr = 0;
 293   ip6_address_t *ip6_addr = 0;
 294   char hostname[FQDN_MAX_LENGTH];
 295
 296   /* Check the current state of the connection
 297    *
 298    * The logic required by the RFC4960 Section 5.2.2 is already taken care of
 299    * in the code below and by the "sctp_prepare_initack_chunk" function.
 300    * However, for debugging purposes it is nice to have a message printed out
 301    * for these corner-case scenarios.
 302    */
 303   if (sctp_conn->state != SCTP_STATE_CLOSED)
 304     {                           /* UNEXPECTED scenario */
 305       switch (sctp_conn->state)
 306         {
 307         case SCTP_STATE_COOKIE_WAIT:    /* TODO */
 308           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_WAIT state");
 309           break;
 310         case SCTP_STATE_COOKIE_ECHOED:  /* TODO */
 311           SCTP_ADV_DBG ("Received INIT chunk while in COOKIE_ECHOED state");
 312           break;
 313         }
 314     }
 315
 316   if (sctp_hdr->verification_tag != 0x0)
 317     return SCTP_ERROR_INVALID_TAG_FOR_INIT;
 318
 319   /*
 320    * It is not possible to bundle any other CHUNK with the INIT chunk
 321    */
 322   if (sctp_is_bundling (sctp_implied_length, &init_chunk->chunk_hdr))
 323     return SCTP_ERROR_BUNDLING_VIOLATION;
 324
 325   /* Save the INITIATE_TAG of the remote peer for this connection:
 326    * it MUST be used for the VERIFICATION_TAG parameter in the SCTP HEADER */
 327   sctp_conn->remote_tag = init_chunk->initiate_tag;
 328   sctp_conn->remote_initial_tsn =
 329     clib_net_to_host_u32 (init_chunk->initial_tsn);
 330   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 331   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 332   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 333                           sctp_conn->remote_initial_tsn);
 334
 335   sctp_conn->snd_opts.a_rwnd = clib_net_to_host_u32 (init_chunk->a_rwnd);
 336
 337   /*
 338    * If the length specified in the INIT message is bigger than the size in bytes of our structure it means that
 339    * optional parameters have been sent with the INIT chunk and we need to parse them.
 340    */
 341   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 342   if (length > sizeof (sctp_init_chunk_t))
 343     {
 344       /* There are optional parameters in the INIT chunk */
 345       u16 pointer_offset = sizeof (sctp_init_chunk_t);
 346       while (pointer_offset < length)
 347         {
 348           sctp_opt_params_hdr_t *opt_params_hdr =
 349             (sctp_opt_params_hdr_t *) init_chunk + pointer_offset;
 350
 351           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 352             {
 353             case SCTP_IPV4_ADDRESS_TYPE:
 354               {
 355                 sctp_ipv4_addr_param_t *ipv4 =
 356                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 357                 clib_memcpy (ip4_addr, &ipv4->address,
 358                              sizeof (ip4_address_t));
 359
 360                 sctp_sub_connection_add_ip4 (vlib_get_thread_index (), ipv4);
 361
 362                 break;
 363               }
 364             case SCTP_IPV6_ADDRESS_TYPE:
 365               {
 366                 sctp_ipv6_addr_param_t *ipv6 =
 367                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 368                 clib_memcpy (ip6_addr, &ipv6->address,
 369                              sizeof (ip6_address_t));
 370
 371                 sctp_sub_connection_add_ip6 (vlib_get_thread_index (), ipv6);
 372
 373                 break;
 374               }
 375             case SCTP_COOKIE_PRESERVATIVE_TYPE:
 376               {
 377                 sctp_cookie_preservative_param_t *cookie_pres =
 378                   (sctp_cookie_preservative_param_t *) opt_params_hdr;
 379                 sctp_conn->peer_cookie_life_span_increment =
 380                   cookie_pres->life_span_inc;
 381                 break;
 382               }
 383             case SCTP_HOSTNAME_ADDRESS_TYPE:
 384               {
 385                 sctp_hostname_param_t *hostname_addr =
 386                   (sctp_hostname_param_t *) opt_params_hdr;
 387                 clib_memcpy (hostname, hostname_addr->hostname,
 388                              FQDN_MAX_LENGTH);
 389                 break;
 390               }
 391             case SCTP_SUPPORTED_ADDRESS_TYPES:
 392               {
 393                 /* TODO */
 394                 break;
 395               }
 396             }
 397           pointer_offset += clib_net_to_host_u16 (opt_params_hdr->length);
 398         }
 399     }
 400
 401   /* Reuse buffer to make init-ack and send */
 402   sctp_prepare_initack_chunk (sctp_conn, MAIN_SCTP_SUB_CONN_IDX, b0, ip4_addr,
 403                               ip6_addr);
 404   return SCTP_ERROR_NONE;
 405 }
 406
 407 always_inline u16
 408 sctp_is_valid_init_ack (sctp_header_t * sctp_hdr,
 409                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 410                         sctp_connection_t * sctp_conn, vlib_buffer_t * b0,
 411                         u16 sctp_implied_length)
 412 {
 413   sctp_init_ack_chunk_t *init_ack_chunk =
 414     (sctp_init_ack_chunk_t *) (sctp_hdr);
 415
 416   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 417   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 418     {
 419       return SCTP_ERROR_INVALID_TAG;
 420     }
 421
 422   /*
 423    * It is not possible to bundle any other CHUNK with the INIT_ACK chunk
 424    */
 425   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 426     return SCTP_ERROR_BUNDLING_VIOLATION;
 427
 428   return SCTP_ERROR_NONE;
 429 }
 430
 431 always_inline u16
 432 sctp_handle_init_ack (sctp_header_t * sctp_hdr,
 433                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 434                       sctp_connection_t * sctp_conn, u8 idx,
 435                       vlib_buffer_t * b0, u16 sctp_implied_length)
 436 {
 437   sctp_init_ack_chunk_t *init_ack_chunk =
 438     (sctp_init_ack_chunk_t *) (sctp_hdr);
 439   sctp_state_cookie_param_t state_cookie;
 440
 441   char hostname[FQDN_MAX_LENGTH];
 442
 443   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 444   if (sctp_conn->local_tag != init_ack_chunk->sctp_hdr.verification_tag)
 445     {
 446       return SCTP_ERROR_INVALID_TAG;
 447     }
 448
 449   /*
 450    * It is not possible to bundle any other CHUNK with the INIT chunk
 451    */
 452   if (sctp_is_bundling (sctp_implied_length, &init_ack_chunk->chunk_hdr))
 453     return SCTP_ERROR_BUNDLING_VIOLATION;
 454
 455   sctp_calculate_rto (sctp_conn, idx);
 456
 457   /* remote_tag to be placed in the VERIFICATION_TAG field of the COOKIE_ECHO chunk */
 458   sctp_conn->remote_tag = init_ack_chunk->initiate_tag;
 459   sctp_conn->remote_initial_tsn =
 460     clib_net_to_host_u32 (init_ack_chunk->initial_tsn);
 461   sctp_conn->last_rcvd_tsn = sctp_conn->remote_initial_tsn;
 462   sctp_conn->next_tsn_expected = sctp_conn->remote_initial_tsn + 1;
 463   SCTP_CONN_TRACKING_DBG ("sctp_conn->remote_initial_tsn = %u",
 464                           sctp_conn->remote_initial_tsn);
 465   sctp_conn->snd_opts.a_rwnd = clib_net_to_host_u32 (init_ack_chunk->a_rwnd);
 466
 467   u16 length = vnet_sctp_get_chunk_length (sctp_chunk_hdr);
 468
 469   if (length > sizeof (sctp_init_ack_chunk_t))
 470     /*
 471      * There are optional parameters in the INIT ACK chunk
 472      */
 473     {
 474       u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
 475
 476       while (pointer_offset < length)
 477         {
 478           sctp_opt_params_hdr_t *opt_params_hdr =
 479             (sctp_opt_params_hdr_t *) ((char *) init_ack_chunk +
 480                                        pointer_offset);
 481
 482           switch (clib_net_to_host_u16 (opt_params_hdr->type))
 483             {
 484             case SCTP_IPV4_ADDRESS_TYPE:
 485               {
 486                 sctp_ipv4_addr_param_t *ipv4 =
 487                   (sctp_ipv4_addr_param_t *) opt_params_hdr;
 488
 489                 sctp_sub_connection_add_ip4 (vlib_get_thread_index (), ipv4);
 490
 491                 break;
 492               }
 493             case SCTP_IPV6_ADDRESS_TYPE:
 494               {
 495                 sctp_ipv6_addr_param_t *ipv6 =
 496                   (sctp_ipv6_addr_param_t *) opt_params_hdr;
 497
 498                 sctp_sub_connection_add_ip6 (vlib_get_thread_index (), ipv6);
 499
 500                 break;
 501               }
 502             case SCTP_STATE_COOKIE_TYPE:
 503               {
 504                 sctp_state_cookie_param_t *state_cookie_param =
 505                   (sctp_state_cookie_param_t *) opt_params_hdr;
 506
 507                 clib_memcpy (&state_cookie, state_cookie_param,
 508                              sizeof (sctp_state_cookie_param_t));
 509                 break;
 510               }
 511             case SCTP_HOSTNAME_ADDRESS_TYPE:
 512               {
 513                 sctp_hostname_param_t *hostname_addr =
 514                   (sctp_hostname_param_t *) opt_params_hdr;
 515                 clib_memcpy (hostname, hostname_addr->hostname,
 516                              FQDN_MAX_LENGTH);
 517                 break;
 518               }
 519             case SCTP_UNRECOGNIZED_TYPE:
 520               {
 521                 break;
 522               }
 523             }
 524           u16 increment = clib_net_to_host_u16 (opt_params_hdr->length);
 525           /* This indicates something really bad happened */
 526           if (increment == 0)
 527             {
 528               return SCTP_ERROR_INVALID_TAG;
 529             }
 530           pointer_offset += increment;
 531         }
 532     }
 533
 534   sctp_prepare_cookie_echo_chunk (sctp_conn, idx, b0, &state_cookie);
 535
 536   /* Start the T1_COOKIE timer */
 537   sctp_timer_set (sctp_conn, idx,
 538                   SCTP_TIMER_T1_COOKIE, sctp_conn->sub_conn[idx].RTO);
 539
 540   return SCTP_ERROR_NONE;
 541 }
 542
 543 /** Enqueue data out-of-order for delivery to application */
 544 always_inline int
 545 sctp_session_enqueue_data_ooo (sctp_connection_t * sctp_conn,
 546                                vlib_buffer_t * b, u16 data_len, u8 conn_idx)
 547 {
 548   int written, error = SCTP_ERROR_ENQUEUED;
 549
 550   written =
 551     session_enqueue_stream_connection (&sctp_conn->
 552                                        sub_conn[conn_idx].connection, b, 0,
 553                                        1 /* queue event */ ,
 554                                        0);
 555
 556   /* Update next_tsn_expected */
 557   if (PREDICT_TRUE (written == data_len))
 558     {
 559       sctp_conn->next_tsn_expected += written;
 560
 561       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 562                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 563                     written, data_len);
 564     }
 565   /* If more data written than expected, account for out-of-order bytes. */
 566   else if (written > data_len)
 567     {
 568       sctp_conn->next_tsn_expected += written;
 569
 570       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 571                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 572                     written, data_len);
 573     }
 574   else if (written > 0)
 575     {
 576       /* We've written something but FIFO is probably full now */
 577       sctp_conn->next_tsn_expected += written;
 578
 579       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 580
 581       SCTP_ADV_DBG
 582         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 583          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 584     }
 585   else
 586     {
 587       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 588                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 589
 590       return SCTP_ERROR_FIFO_FULL;
 591     }
 592
 593   /* TODO: Update out_of_order_map & SACK list */
 594
 595   return error;
 596 }
 597
 598 /** Enqueue data for delivery to application */
 599 always_inline int
 600 sctp_session_enqueue_data (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
 601                            u16 data_len, u8 conn_idx)
 602 {
 603   int written, error = SCTP_ERROR_ENQUEUED;
 604
 605   written =
 606     session_enqueue_stream_connection (&sctp_conn->
 607                                        sub_conn[conn_idx].connection, b, 0,
 608                                        1 /* queue event */ ,
 609                                        1);
 610
 611   /* Update next_tsn_expected */
 612   if (PREDICT_TRUE (written == data_len))
 613     {
 614       sctp_conn->next_tsn_expected += written;
 615
 616       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] == DATA_LEN [%d]",
 617                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 618                     written, data_len);
 619     }
 620   /* If more data written than expected, account for out-of-order bytes. */
 621   else if (written > data_len)
 622     {
 623       sctp_conn->next_tsn_expected += written;
 624
 625       SCTP_ADV_DBG ("CONN = %u, WRITTEN [%u] > DATA_LEN [%d]",
 626                     sctp_conn->sub_conn[conn_idx].connection.c_index,
 627                     written, data_len);
 628     }
 629   else if (written > 0)
 630     {
 631       /* We've written something but FIFO is probably full now */
 632       sctp_conn->next_tsn_expected += written;
 633
 634       error = SCTP_ERROR_PARTIALLY_ENQUEUED;
 635
 636       SCTP_ADV_DBG
 637         ("CONN = %u, WRITTEN [%u] > 0 (SCTP_ERROR_PARTIALLY_ENQUEUED)",
 638          sctp_conn->sub_conn[conn_idx].connection.c_index, written);
 639     }
 640   else
 641     {
 642       SCTP_ADV_DBG ("CONN = %u, WRITTEN == 0 (SCTP_ERROR_FIFO_FULL)",
 643                     sctp_conn->sub_conn[conn_idx].connection.c_index);
 644
 645       return SCTP_ERROR_FIFO_FULL;
 646     }
 647
 648   return error;
 649 }
 650
 651 always_inline u8
 652 sctp_is_sack_delayable (sctp_connection_t * sctp_conn, u8 idx, u8 is_gapping)
 653 {
 654   if (is_gapping != 0)
 655     {
 656       SCTP_CONN_TRACKING_DBG
 657         ("gapping != 0: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 658          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 659       return 0;
 660     }
 661
 662   if (sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS)
 663     {
 664       SCTP_CONN_TRACKING_DBG
 665         ("sctp_conn->ack_state >= MAX_ENQUEABLE_SACKS: CONN_INDEX = %u, sctp_conn->ack_state = %u",
 666          sctp_conn->sub_conn[idx].connection.c_index, sctp_conn->ack_state);
 667       return 0;
 668     }
 669
 670   sctp_conn->ack_state += 1;
 671
 672   return 1;
 673 }
 674
 675 always_inline void
 676 sctp_is_connection_gapping (sctp_connection_t * sctp_conn, u32 tsn,
 677                             u8 * gapping)
 678 {
 679   if (sctp_conn->next_tsn_expected != tsn)      // It means data transmission is GAPPING
 680     {
 681       SCTP_CONN_TRACKING_DBG
 682         ("GAPPING: CONN_INDEX = %u, sctp_conn->next_tsn_expected = %u, tsn = %u, diff = %u",
 683          sctp_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.c_index,
 684          sctp_conn->next_tsn_expected, tsn,
 685          sctp_conn->next_tsn_expected - tsn);
 686
 687       *gapping = 1;
 688     }
 689 }
 690
 691 always_inline u16
 692 sctp_handle_data (sctp_payload_data_chunk_t * sctp_data_chunk,
 693                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b,
 694                   u16 * next0)
 695 {
 696   u32 error = 0, n_data_bytes;
 697   u8 is_gapping = 0;
 698
 699   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 700   if (sctp_conn->local_tag != sctp_data_chunk->sctp_hdr.verification_tag)
 701     {
 702       return SCTP_ERROR_INVALID_TAG;
 703     }
 704
 705   vnet_buffer (b)->sctp.sid = sctp_data_chunk->stream_id;
 706   vnet_buffer (b)->sctp.ssn = sctp_data_chunk->stream_seq;
 707
 708   u32 tsn = clib_net_to_host_u32 (sctp_data_chunk->tsn);
 709
 710   vlib_buffer_advance (b, vnet_buffer (b)->sctp.data_offset);
 711   n_data_bytes = vnet_buffer (b)->sctp.data_len;
 712   ASSERT (n_data_bytes);
 713
 714   sctp_is_connection_gapping (sctp_conn, tsn, &is_gapping);
 715
 716   sctp_conn->last_rcvd_tsn = tsn;
 717
 718   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 719
 720   u8 bbit = vnet_sctp_get_bbit (&sctp_data_chunk->chunk_hdr);
 721   u8 ebit = vnet_sctp_get_ebit (&sctp_data_chunk->chunk_hdr);
 722
 723   if (bbit == 1 && ebit == 1)   /* Unfragmented message */
 724     {
 725       /* In order data, enqueue. Fifo figures out by itself if any out-of-order
 726        * segments can be enqueued after fifo tail offset changes. */
 727       if (PREDICT_FALSE (is_gapping == 1))
 728         error =
 729           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 730       else
 731         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 732     }
 733   else if (bbit == 1 && ebit == 0)      /* First piece of a fragmented user message */
 734     {
 735       error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 736     }
 737   else if (bbit == 0 && ebit == 1)      /* Last 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   else                          /* Middle piece of a fragmented user message */
 746     {
 747       if (PREDICT_FALSE (is_gapping == 1))
 748         error =
 749           sctp_session_enqueue_data_ooo (sctp_conn, b, n_data_bytes, idx);
 750       else
 751         error = sctp_session_enqueue_data (sctp_conn, b, n_data_bytes, idx);
 752     }
 753   sctp_conn->last_rcvd_tsn = tsn;
 754
 755   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 756
 757   SCTP_ADV_DBG ("POINTER_WITH_DATA = %p", b->data);
 758
 759   if (!sctp_is_sack_delayable (sctp_conn, idx, is_gapping))
 760     sctp_prepare_sack_chunk (sctp_conn, idx, b);
 761
 762   sctp_conn->sub_conn[idx].enqueue_state = error;
 763
 764   return error;
 765 }
 766
 767 always_inline u16
 768 sctp_handle_cookie_echo (sctp_header_t * sctp_hdr,
 769                          sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 770                          sctp_connection_t * sctp_conn, u8 idx,
 771                          vlib_buffer_t * b0, u16 * next0)
 772 {
 773   u32 now = sctp_time_now ();
 774
 775   sctp_cookie_echo_chunk_t *cookie_echo =
 776     (sctp_cookie_echo_chunk_t *) sctp_hdr;
 777
 778   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 779   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 780     {
 781       return SCTP_ERROR_INVALID_TAG;
 782     }
 783
 784   sctp_calculate_rto (sctp_conn, idx);
 785
 786   u32 creation_time =
 787     clib_net_to_host_u32 (cookie_echo->cookie.creation_time);
 788   u32 cookie_lifespan =
 789     clib_net_to_host_u32 (cookie_echo->cookie.cookie_lifespan);
 790   if (now > creation_time + cookie_lifespan)
 791     {
 792       SCTP_DBG ("now (%u) > creation_time (%u) + cookie_lifespan (%u)",
 793                 now, creation_time, cookie_lifespan);
 794       return SCTP_ERROR_COOKIE_ECHO_VIOLATION;
 795     }
 796
 797   sctp_prepare_cookie_ack_chunk (sctp_conn, idx, b0);
 798
 799   /* Change state */
 800   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 801   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 802   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
 803
 804   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 805                   sctp_conn->sub_conn[idx].RTO);
 806
 807   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 808
 809   return SCTP_ERROR_NONE;
 810
 811 }
 812
 813 always_inline u16
 814 sctp_handle_cookie_ack (sctp_header_t * sctp_hdr,
 815                         sctp_chunks_common_hdr_t * sctp_chunk_hdr,
 816                         sctp_connection_t * sctp_conn, u8 idx,
 817                         vlib_buffer_t * b0, u16 * next0)
 818 {
 819   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
 820   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
 821     {
 822       return SCTP_ERROR_INVALID_TAG;
 823     }
 824
 825   sctp_calculate_rto (sctp_conn, idx);
 826
 827   sctp_timer_reset (sctp_conn, idx, SCTP_TIMER_T1_COOKIE);
 828   /* Change state */
 829   sctp_conn->state = SCTP_STATE_ESTABLISHED;
 830   sctp_conn->sub_conn[idx].state = SCTP_SUBCONN_STATE_UP;
 831
 832   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
 833
 834   sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
 835                   sctp_conn->sub_conn[idx].RTO);
 836
 837   stream_session_accept_notify (&sctp_conn->sub_conn[idx].connection);
 838
 839   return SCTP_ERROR_NONE;
 840
 841 }
 842
 843 always_inline uword
 844 sctp46_rcv_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 845                          vlib_frame_t * from_frame, int is_ip4)
 846 {
 847   sctp_main_t *tm = vnet_get_sctp_main ();
 848
 849   u32 n_left_from, next_index, *from, *to_next;
 850   u32 my_thread_index = vm->thread_index;
 851
 852   from = vlib_frame_vector_args (from_frame);
 853   n_left_from = from_frame->n_vectors;
 854
 855   next_index = node->cached_next_index;
 856
 857   while (n_left_from > 0)
 858     {
 859       u32 n_left_to_next;
 860
 861       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 862
 863       while (n_left_from > 0 && n_left_to_next > 0)
 864         {
 865           u32 bi0;
 866           vlib_buffer_t *b0;
 867           sctp_header_t *sctp_hdr = 0;
 868           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
 869           ip4_header_t *ip4_hdr = 0;
 870           ip6_header_t *ip6_hdr = 0;
 871           sctp_connection_t *sctp_conn, *new_sctp_conn;
 872           u16 sctp_implied_length = 0;
 873           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
 874           u8 idx;
 875
 876           bi0 = from[0];
 877           to_next[0] = bi0;
 878           from += 1;
 879           to_next += 1;
 880           n_left_from -= 1;
 881           n_left_to_next -= 1;
 882
 883           b0 = vlib_get_buffer (vm, bi0);
 884
 885           /* If we are in SCTP_COOKIE_WAIT_STATE then the connection
 886            * will come from the half-open connections pool.
 887            */
 888           sctp_conn =
 889             sctp_half_open_connection_get (vnet_buffer (b0)->
 890                                            sctp.connection_index);
 891
 892           if (PREDICT_FALSE (sctp_conn == 0))
 893             {
 894               SCTP_ADV_DBG
 895                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
 896               error0 = SCTP_ERROR_INVALID_CONNECTION;
 897               goto drop;
 898             }
 899           if (is_ip4)
 900             {
 901               ip4_hdr = vlib_buffer_get_current (b0);
 902               sctp_hdr = ip4_next_header (ip4_hdr);
 903               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
 904             }
 905           else
 906             {
 907               ip6_hdr = vlib_buffer_get_current (b0);
 908               sctp_hdr = ip6_next_header (ip6_hdr);
 909               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
 910             }
 911
 912           sctp_conn->sub_conn[idx].parent = sctp_conn;
 913           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
 914
 915           sctp_chunk_hdr =
 916             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
 917
 918           sctp_implied_length =
 919             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
 920
 921           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
 922
 923           switch (chunk_type)
 924             {
 925             case INIT_ACK:
 926               error0 =
 927                 sctp_is_valid_init_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
 928                                         b0, sctp_implied_length);
 929
 930               if (error0 == SCTP_ERROR_NONE)
 931                 {
 932                   pool_get (tm->connections[my_thread_index], new_sctp_conn);
 933                   clib_memcpy (new_sctp_conn, sctp_conn,
 934                                sizeof (*new_sctp_conn));
 935                   new_sctp_conn->sub_conn[idx].c_c_index =
 936                     new_sctp_conn - tm->connections[my_thread_index];
 937                   new_sctp_conn->sub_conn[idx].c_thread_index =
 938                     my_thread_index;
 939                   new_sctp_conn->sub_conn[idx].parent = new_sctp_conn;
 940
 941                   if (sctp_half_open_connection_cleanup (sctp_conn))
 942                     {
 943                       SCTP_DBG
 944                         ("Cannot cleanup half-open connection; not the owning thread");
 945                     }
 946
 947                   sctp_connection_timers_init (new_sctp_conn);
 948
 949                   error0 =
 950                     sctp_handle_init_ack (sctp_hdr, sctp_chunk_hdr,
 951                                           new_sctp_conn, idx, b0,
 952                                           sctp_implied_length);
 953
 954                   sctp_init_mss (new_sctp_conn);
 955
 956                   if (session_stream_connect_notify
 957                       (&new_sctp_conn->sub_conn[idx].connection, 0))
 958                     {
 959                       SCTP_DBG
 960                         ("conn_index = %u: session_stream_connect_notify error; cleaning up connection",
 961                          new_sctp_conn->sub_conn[idx].connection.c_index);
 962                       sctp_connection_cleanup (new_sctp_conn);
 963                       goto drop;
 964                     }
 965                 }
 966               next0 = sctp_next_output (is_ip4);
 967               break;
 968
 969               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
 970                * are handled by the input-dispatcher function using the table-lookup
 971                * hence we should never get to the "default" case below.
 972                */
 973             default:
 974               error0 = SCTP_ERROR_UNKOWN_CHUNK;
 975               next0 = sctp_next_drop (is_ip4);
 976               goto drop;
 977             }
 978
 979           if (error0 != SCTP_ERROR_NONE)
 980             {
 981               clib_warning ("error while parsing chunk");
 982               sctp_connection_cleanup (sctp_conn);
 983               next0 = sctp_next_drop (is_ip4);
 984               goto drop;
 985             }
 986
 987         drop:
 988           b0->error = node->errors[error0];
 989           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 990             {
 991               sctp_rx_trace_t *t0 =
 992                 vlib_add_trace (vm, node, b0, sizeof (*t0));
 993               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
 994             }
 995
 996           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 997                                            n_left_to_next, bi0, next0);
 998         }
 999
1000       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1001     }
1002   return from_frame->n_vectors;
1003 }
1004
1005 static uword
1006 sctp4_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1007                  vlib_frame_t * from_frame)
1008 {
1009   return sctp46_rcv_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1010 }
1011
1012 static uword
1013 sctp6_rcv_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1014                  vlib_frame_t * from_frame)
1015 {
1016   return sctp46_rcv_phase_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1017 }
1018
1019 u8 *
1020 format_sctp_rx_trace_short (u8 * s, va_list * args)
1021 {
1022   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1023   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1024   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1025
1026   s = format (s, "%d -> %d (%U)",
1027               clib_net_to_host_u16 (t->sctp_header.src_port),
1028               clib_net_to_host_u16 (t->sctp_header.dst_port),
1029               format_sctp_state, t->sctp_connection.state);
1030
1031   return s;
1032 }
1033
1034 /* *INDENT-OFF* */
1035 VLIB_REGISTER_NODE (sctp4_rcv_phase_node) =
1036 {
1037   .function = sctp4_rcv_phase,
1038   .name = "sctp4-rcv",
1039   /* Takes a vector of packets. */
1040   .vector_size = sizeof (u32),
1041   .n_errors = SCTP_N_ERROR,
1042   .error_strings = sctp_error_strings,
1043   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1044   .next_nodes =
1045   {
1046 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1047     foreach_sctp_state_next
1048 #undef _
1049   },
1050   .format_trace = format_sctp_rx_trace_short,
1051 };
1052 /* *INDENT-ON* */
1053
1054 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_rcv_phase_node, sctp4_rcv_phase);
1055
1056 /* *INDENT-OFF* */
1057 VLIB_REGISTER_NODE (sctp6_init_phase_node) =
1058 {
1059   .function = sctp6_rcv_phase,
1060   .name = "sctp6-rcv",
1061   /* Takes a vector of packets. */
1062   .vector_size = sizeof (u32),
1063   .n_errors = SCTP_N_ERROR,
1064   .error_strings = sctp_error_strings,
1065   .n_next_nodes = SCTP_RCV_PHASE_N_NEXT,
1066   .next_nodes =
1067   {
1068 #define _(s,n) [SCTP_RCV_PHASE_NEXT_##s] = n,
1069     foreach_sctp_state_next
1070 #undef _
1071   },
1072   .format_trace = format_sctp_rx_trace_short,
1073 };
1074 /* *INDENT-ON* */
1075
1076 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_init_phase_node, sctp6_rcv_phase);
1077
1078 vlib_node_registration_t sctp4_shutdown_phase_node;
1079 vlib_node_registration_t sctp6_shutdown_phase_node;
1080
1081 always_inline u16
1082 sctp_handle_shutdown (sctp_header_t * sctp_hdr,
1083                       sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1084                       sctp_connection_t * sctp_conn, u8 idx,
1085                       vlib_buffer_t * b0, u16 sctp_implied_length,
1086                       u16 * next0)
1087 {
1088   sctp_shutdown_association_chunk_t *shutdown_chunk =
1089     (sctp_shutdown_association_chunk_t *) (sctp_hdr);
1090
1091   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1092   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1093     {
1094       return SCTP_ERROR_INVALID_TAG;
1095     }
1096
1097   /*
1098    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1099    */
1100   if (sctp_is_bundling (sctp_implied_length, &shutdown_chunk->chunk_hdr))
1101     return SCTP_ERROR_BUNDLING_VIOLATION;
1102
1103   switch (sctp_conn->state)
1104     {
1105     case SCTP_STATE_ESTABLISHED:
1106       if (sctp_check_outstanding_data_chunks (sctp_conn) == 0)
1107         sctp_conn->state = SCTP_STATE_SHUTDOWN_RECEIVED;
1108       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1109       break;
1110
1111     case SCTP_STATE_SHUTDOWN_SENT:
1112       sctp_send_shutdown_ack (sctp_conn, idx, b0);
1113       break;
1114     }
1115
1116   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1117
1118   return SCTP_ERROR_NONE;
1119 }
1120
1121 always_inline u16
1122 sctp_handle_shutdown_ack (sctp_header_t * sctp_hdr,
1123                           sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1124                           sctp_connection_t * sctp_conn, u8 idx,
1125                           vlib_buffer_t * b0, u16 sctp_implied_length,
1126                           u16 * next0)
1127 {
1128   sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
1129     (sctp_shutdown_ack_chunk_t *) (sctp_hdr);
1130
1131   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1132   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1133     {
1134       return SCTP_ERROR_INVALID_TAG;
1135     }
1136
1137   /*
1138    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1139    */
1140   if (sctp_is_bundling (sctp_implied_length, &shutdown_ack_chunk->chunk_hdr))
1141     return SCTP_ERROR_BUNDLING_VIOLATION;
1142
1143   /* Whether we are in SCTP_STATE_SHUTDOWN_SENT or SCTP_STATE_SHUTDOWN_ACK_SENT
1144    * the reception of a SHUTDOWN_ACK chunk leads to the same actions:
1145    * - STOP T2_SHUTDOWN timer
1146    * - SEND SHUTDOWN_COMPLETE chunk
1147    */
1148   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1149                     SCTP_TIMER_T2_SHUTDOWN);
1150
1151   sctp_send_shutdown_complete (sctp_conn, idx, b0);
1152
1153   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].c_is_ip4);
1154
1155   return SCTP_ERROR_NONE;
1156 }
1157
1158 always_inline u16
1159 sctp_handle_shutdown_complete (sctp_header_t * sctp_hdr,
1160                                sctp_chunks_common_hdr_t * sctp_chunk_hdr,
1161                                sctp_connection_t * sctp_conn, u8 idx,
1162                                vlib_buffer_t * b0, u16 sctp_implied_length,
1163                                u16 * next0)
1164 {
1165   sctp_shutdown_complete_chunk_t *shutdown_complete =
1166     (sctp_shutdown_complete_chunk_t *) (sctp_hdr);
1167
1168   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1169   if (sctp_conn->local_tag != sctp_hdr->verification_tag)
1170     {
1171       return SCTP_ERROR_INVALID_TAG;
1172     }
1173
1174   /*
1175    * It is not possible to bundle any other CHUNK with the SHUTDOWN chunk
1176    */
1177   if (sctp_is_bundling (sctp_implied_length, &shutdown_complete->chunk_hdr))
1178     return SCTP_ERROR_BUNDLING_VIOLATION;
1179
1180   sctp_timer_reset (sctp_conn, MAIN_SCTP_SUB_CONN_IDX,
1181                     SCTP_TIMER_T2_SHUTDOWN);
1182
1183   sctp_conn->state = SCTP_STATE_CLOSED;
1184
1185   stream_session_disconnect_notify (&sctp_conn->sub_conn
1186                                     [MAIN_SCTP_SUB_CONN_IDX].connection);
1187
1188   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1189
1190   return SCTP_ERROR_NONE;
1191 }
1192
1193 always_inline uword
1194 sctp46_shutdown_phase_inline (vlib_main_t * vm,
1195                               vlib_node_runtime_t * node,
1196                               vlib_frame_t * from_frame, int is_ip4)
1197 {
1198   u32 n_left_from, next_index, *from, *to_next;
1199   u32 my_thread_index = vm->thread_index;
1200
1201   from = vlib_frame_vector_args (from_frame);
1202   n_left_from = from_frame->n_vectors;
1203
1204   next_index = node->cached_next_index;
1205
1206   while (n_left_from > 0)
1207     {
1208       u32 n_left_to_next;
1209
1210       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1211
1212       while (n_left_from > 0 && n_left_to_next > 0)
1213         {
1214           u32 bi0;
1215           vlib_buffer_t *b0;
1216           sctp_rx_trace_t *sctp_trace;
1217           sctp_header_t *sctp_hdr = 0;
1218           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1219           ip4_header_t *ip4_hdr = 0;
1220           ip6_header_t *ip6_hdr = 0;
1221           sctp_connection_t *sctp_conn;
1222           u16 sctp_implied_length = 0;
1223           u16 error0 = SCTP_ERROR_NONE, next0 = SCTP_RCV_PHASE_N_NEXT;
1224           u8 idx = 0;
1225
1226           bi0 = from[0];
1227           to_next[0] = bi0;
1228           from += 1;
1229           to_next += 1;
1230           n_left_from -= 1;
1231           n_left_to_next -= 1;
1232
1233           b0 = vlib_get_buffer (vm, bi0);
1234           sctp_conn =
1235             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1236                                  my_thread_index);
1237
1238           if (PREDICT_FALSE (sctp_conn == 0))
1239             {
1240               SCTP_DBG
1241                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1242               error0 = SCTP_ERROR_INVALID_CONNECTION;
1243               goto drop;
1244             }
1245
1246           if (is_ip4)
1247             {
1248               ip4_hdr = vlib_buffer_get_current (b0);
1249               sctp_hdr = ip4_next_header (ip4_hdr);
1250               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1251             }
1252           else
1253             {
1254               ip6_hdr = vlib_buffer_get_current (b0);
1255               sctp_hdr = ip6_next_header (ip6_hdr);
1256               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1257             }
1258
1259           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1260           sctp_chunk_hdr = &full_hdr->common_hdr;
1261
1262           sctp_implied_length =
1263             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1264
1265           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1266           switch (chunk_type)
1267             {
1268             case SHUTDOWN:
1269               error0 =
1270                 sctp_handle_shutdown (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1271                                       idx, b0, sctp_implied_length, &next0);
1272               break;
1273
1274             case SHUTDOWN_ACK:
1275               error0 =
1276                 sctp_handle_shutdown_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1277                                           idx, b0, sctp_implied_length,
1278                                           &next0);
1279               break;
1280
1281             case SHUTDOWN_COMPLETE:
1282               error0 =
1283                 sctp_handle_shutdown_complete (sctp_hdr, sctp_chunk_hdr,
1284                                                sctp_conn, idx, b0,
1285                                                sctp_implied_length, &next0);
1286
1287               sctp_connection_cleanup (sctp_conn);
1288               break;
1289
1290               /*
1291                * DATA chunks can still be transmitted/received in the SHUTDOWN-PENDING
1292                * and SHUTDOWN-SENT states (as per RFC4960 Section 6)
1293                */
1294             case DATA:
1295               error0 =
1296                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1297                                   sctp_conn, idx, b0, &next0);
1298               break;
1299
1300               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1301                * are handled by the input-dispatcher function using the table-lookup
1302                * hence we should never get to the "default" case below.
1303                */
1304             default:
1305               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1306               next0 = sctp_next_drop (is_ip4);
1307               goto drop;
1308             }
1309
1310           if (error0 != SCTP_ERROR_NONE)
1311             {
1312               clib_warning ("error while parsing chunk");
1313               sctp_connection_cleanup (sctp_conn);
1314               next0 = sctp_next_drop (is_ip4);
1315               goto drop;
1316             }
1317
1318         drop:
1319           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1320             {
1321               sctp_trace =
1322                 vlib_add_trace (vm, node, b0, sizeof (*sctp_trace));
1323
1324               if (sctp_hdr != NULL)
1325                 clib_memcpy (&sctp_trace->sctp_header, sctp_hdr,
1326                              sizeof (sctp_trace->sctp_header));
1327
1328               if (sctp_conn != NULL)
1329                 clib_memcpy (&sctp_trace->sctp_connection, sctp_conn,
1330                              sizeof (sctp_trace->sctp_connection));
1331             }
1332
1333           b0->error = node->errors[error0];
1334
1335           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1336                                            n_left_to_next, bi0, next0);
1337         }
1338
1339       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1340     }
1341
1342   return from_frame->n_vectors;
1343
1344 }
1345
1346 static uword
1347 sctp4_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1348                       vlib_frame_t * from_frame)
1349 {
1350   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1351 }
1352
1353 static uword
1354 sctp6_shutdown_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1355                       vlib_frame_t * from_frame)
1356 {
1357   return sctp46_shutdown_phase_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1358 }
1359
1360 /* *INDENT-OFF* */
1361 VLIB_REGISTER_NODE (sctp4_shutdown_phase_node) =
1362 {
1363   .function = sctp4_shutdown_phase,
1364   .name = "sctp4-shutdown",
1365   /* Takes a vector of packets. */
1366   .vector_size = sizeof (u32),
1367   .n_errors = SCTP_N_ERROR,
1368   .error_strings = sctp_error_strings,
1369   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1370   .next_nodes =
1371   {
1372 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1373     foreach_sctp_state_next
1374 #undef _
1375   },
1376   .format_trace = format_sctp_rx_trace_short,
1377 };
1378 /* *INDENT-ON* */
1379
1380 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_shutdown_phase_node,
1381                               sctp4_shutdown_phase);
1382
1383 /* *INDENT-OFF* */
1384 VLIB_REGISTER_NODE (sctp6_shutdown_phase_node) =
1385 {
1386   .function = sctp6_shutdown_phase,
1387   .name = "sctp6-shutdown",
1388   /* Takes a vector of packets. */
1389   .vector_size = sizeof (u32),
1390   .n_errors = SCTP_N_ERROR,
1391   .error_strings = sctp_error_strings,
1392   .n_next_nodes = SCTP_SHUTDOWN_PHASE_N_NEXT,
1393   .next_nodes =
1394   {
1395 #define _(s,n) [SCTP_SHUTDOWN_PHASE_NEXT_##s] = n,
1396     foreach_sctp_state_next
1397 #undef _
1398   },
1399   .format_trace = format_sctp_rx_trace_short,
1400 };
1401 /* *INDENT-ON* */
1402
1403 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_shutdown_phase_node,
1404                               sctp6_shutdown_phase);
1405
1406 vlib_node_registration_t sctp4_listen_phase_node;
1407 vlib_node_registration_t sctp6_listen_phase_node;
1408
1409 vlib_node_registration_t sctp4_established_phase_node;
1410 vlib_node_registration_t sctp6_established_phase_node;
1411
1412 always_inline u16
1413 sctp_handle_sack (sctp_selective_ack_chunk_t * sack_chunk,
1414                   sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b0,
1415                   u16 * next0)
1416 {
1417   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1418   if (sctp_conn->local_tag != sack_chunk->sctp_hdr.verification_tag)
1419     {
1420       return SCTP_ERROR_INVALID_TAG;
1421     }
1422
1423   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1424
1425   sctp_calculate_rto (sctp_conn, idx);
1426
1427   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1428                      sctp_conn->sub_conn[idx].RTO);
1429
1430   sctp_conn->sub_conn[idx].RTO_pending = 0;
1431
1432   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1433
1434   return SCTP_ERROR_NONE;
1435 }
1436
1437 always_inline u16
1438 sctp_handle_heartbeat (sctp_hb_req_chunk_t * sctp_hb_chunk,
1439                        sctp_connection_t * sctp_conn, u8 idx,
1440                        vlib_buffer_t * b0, u16 * next0)
1441 {
1442   /* Check that the LOCALLY generated tag is being used by the REMOTE peer as the verification tag */
1443   if (sctp_conn->local_tag != sctp_hb_chunk->sctp_hdr.verification_tag)
1444     {
1445       return SCTP_ERROR_INVALID_TAG;
1446     }
1447
1448   sctp_prepare_heartbeat_ack_chunk (sctp_conn, idx, b0);
1449
1450   *next0 = sctp_next_output (sctp_conn->sub_conn[idx].connection.is_ip4);
1451
1452   return SCTP_ERROR_NONE;
1453 }
1454
1455 always_inline u16
1456 sctp_handle_heartbeat_ack (sctp_hb_ack_chunk_t * sctp_hb_ack_chunk,
1457                            sctp_connection_t * sctp_conn, u8 idx,
1458                            vlib_buffer_t * b0, u16 * next0)
1459 {
1460   sctp_conn->sub_conn[idx].last_seen = sctp_time_now ();
1461
1462   sctp_conn->sub_conn[idx].unacknowledged_hb -= 1;
1463
1464   sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T4_HEARTBEAT,
1465                      sctp_conn->sub_conn[idx].RTO);
1466
1467   *next0 = sctp_next_drop (sctp_conn->sub_conn[idx].c_is_ip4);
1468
1469   return SCTP_ERROR_NONE;
1470 }
1471
1472 always_inline void
1473 sctp_node_inc_counter (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1474                        u8 is_ip4, u8 evt, u8 val)
1475 {
1476   if (PREDICT_TRUE (!val))
1477     return;
1478
1479   if (is_ip4)
1480     vlib_node_increment_counter (vm, tcp4_node, evt, val);
1481   else
1482     vlib_node_increment_counter (vm, tcp6_node, evt, val);
1483 }
1484
1485 always_inline uword
1486 sctp46_listen_process_inline (vlib_main_t * vm,
1487                               vlib_node_runtime_t * node,
1488                               vlib_frame_t * from_frame, int is_ip4)
1489 {
1490   u32 n_left_from, next_index, *from, *to_next;
1491   u32 my_thread_index = vm->thread_index;
1492
1493   from = vlib_frame_vector_args (from_frame);
1494   n_left_from = from_frame->n_vectors;
1495
1496   next_index = node->cached_next_index;
1497
1498   while (n_left_from > 0)
1499     {
1500       u32 n_left_to_next;
1501
1502       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1503
1504       while (n_left_from > 0 && n_left_to_next > 0)
1505         {
1506           u32 bi0;
1507           vlib_buffer_t *b0;
1508           sctp_header_t *sctp_hdr = 0;
1509           ip4_header_t *ip4_hdr;
1510           ip6_header_t *ip6_hdr;
1511           sctp_connection_t *child_conn;
1512           sctp_connection_t *sctp_listener;
1513           u16 next0 = SCTP_LISTEN_PHASE_N_NEXT, error0 = SCTP_ERROR_ENQUEUED;
1514
1515           bi0 = from[0];
1516           to_next[0] = bi0;
1517           from += 1;
1518           to_next += 1;
1519           n_left_from -= 1;
1520           n_left_to_next -= 1;
1521
1522           b0 = vlib_get_buffer (vm, bi0);
1523           sctp_listener =
1524             sctp_listener_get (vnet_buffer (b0)->sctp.connection_index);
1525
1526           if (is_ip4)
1527             {
1528               ip4_hdr = vlib_buffer_get_current (b0);
1529               sctp_hdr = ip4_next_header (ip4_hdr);
1530             }
1531           else
1532             {
1533               ip6_hdr = vlib_buffer_get_current (b0);
1534               sctp_hdr = ip6_next_header (ip6_hdr);
1535             }
1536
1537           child_conn =
1538             sctp_lookup_connection (sctp_listener->sub_conn
1539                                     [MAIN_SCTP_SUB_CONN_IDX].c_fib_index, b0,
1540                                     my_thread_index, is_ip4);
1541
1542           if (PREDICT_FALSE (child_conn->state != SCTP_STATE_CLOSED))
1543             {
1544               SCTP_DBG
1545                 ("conn_index = %u: child_conn->state != SCTP_STATE_CLOSED.... STATE=%s",
1546                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1547                  connection.c_index,
1548                  sctp_state_to_string (child_conn->state));
1549               error0 = SCTP_ERROR_CREATE_EXISTS;
1550               goto drop;
1551             }
1552
1553           /* Create child session and send SYN-ACK */
1554           child_conn = sctp_connection_new (my_thread_index);
1555           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = child_conn;
1556           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_port =
1557             sctp_hdr->dst_port;
1558           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_port =
1559             sctp_hdr->src_port;
1560           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_is_ip4 = is_ip4;
1561           child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto =
1562             sctp_listener->sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection.proto;
1563           child_conn->state = SCTP_STATE_CLOSED;
1564
1565           if (is_ip4)
1566             {
1567               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip4.as_u32 =
1568                 ip4_hdr->dst_address.as_u32;
1569               child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip4.as_u32 =
1570                 ip4_hdr->src_address.as_u32;
1571             }
1572           else
1573             {
1574               clib_memcpy (&child_conn->
1575                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_lcl_ip6,
1576                            &ip6_hdr->dst_address, sizeof (ip6_address_t));
1577               clib_memcpy (&child_conn->
1578                            sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_rmt_ip6,
1579                            &ip6_hdr->src_address, sizeof (ip6_address_t));
1580             }
1581
1582           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1583           sctp_chunks_common_hdr_t *sctp_chunk_hdr = &full_hdr->common_hdr;
1584
1585           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
1586           if (chunk_type != INIT)
1587             {
1588               SCTP_DBG
1589                 ("conn_index = %u: chunk_type != INIT... chunk_type=%s",
1590                  child_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].
1591                  connection.c_index, sctp_chunk_to_string (chunk_type));
1592
1593               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1594               next0 = sctp_next_drop (is_ip4);
1595               goto drop;
1596             }
1597
1598           u16 sctp_implied_length =
1599             sctp_calculate_implied_length (ip4_hdr, ip6_hdr, is_ip4);
1600
1601           switch (chunk_type)
1602             {
1603             case INIT:
1604               sctp_connection_timers_init (child_conn);
1605
1606               sctp_init_snd_vars (child_conn);
1607
1608               error0 =
1609                 sctp_handle_init (sctp_hdr, sctp_chunk_hdr, child_conn, b0,
1610                                   sctp_implied_length);
1611
1612               sctp_init_mss (child_conn);
1613
1614               if (error0 == SCTP_ERROR_NONE)
1615                 {
1616                   if (stream_session_accept
1617                       (&child_conn->
1618                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].connection,
1619                        sctp_listener->
1620                        sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_s_index, 0))
1621                     {
1622                       clib_warning ("session accept fail");
1623                       sctp_connection_cleanup (child_conn);
1624                       error0 = SCTP_ERROR_CREATE_SESSION_FAIL;
1625                       goto drop;
1626                     }
1627                 }
1628               next0 = sctp_next_output (is_ip4);
1629               break;
1630
1631               /* Reception of a DATA chunk whilst in the CLOSED state is called
1632                * "Out of the Blue" packet and handling of the chunk needs special treatment
1633                * as per RFC4960 section 8.4
1634                */
1635             case DATA:
1636               break;
1637             }
1638
1639         drop:
1640           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1641             {
1642               sctp_rx_trace_t *t0 =
1643                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1644               clib_memcpy (&t0->sctp_header, sctp_hdr,
1645                            sizeof (t0->sctp_header));
1646               clib_memcpy (&t0->sctp_connection, sctp_listener,
1647                            sizeof (t0->sctp_connection));
1648             }
1649
1650           b0->error = node->errors[error0];
1651
1652           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1653                                            n_left_to_next, bi0, next0);
1654         }
1655       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1656
1657     }
1658   return from_frame->n_vectors;
1659 }
1660
1661 static uword
1662 sctp4_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1663                     vlib_frame_t * from_frame)
1664 {
1665   return sctp46_listen_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1666 }
1667
1668 static uword
1669 sctp6_listen_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1670                     vlib_frame_t * from_frame)
1671 {
1672   return sctp46_listen_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1673 }
1674
1675 always_inline uword
1676 sctp46_established_phase_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1677                                  vlib_frame_t * from_frame, int is_ip4)
1678 {
1679   u32 n_left_from, next_index, *from, *to_next;
1680   u32 my_thread_index = vm->thread_index, errors = 0;
1681
1682   from = vlib_frame_vector_args (from_frame);
1683   n_left_from = from_frame->n_vectors;
1684
1685   next_index = node->cached_next_index;
1686
1687   while (n_left_from > 0)
1688     {
1689       u32 n_left_to_next;
1690
1691       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1692
1693       while (n_left_from > 0 && n_left_to_next > 0)
1694         {
1695           u32 bi0;
1696           vlib_buffer_t *b0;
1697           sctp_header_t *sctp_hdr = 0;
1698           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1699           ip4_header_t *ip4_hdr = 0;
1700           ip6_header_t *ip6_hdr = 0;
1701           sctp_connection_t *sctp_conn;
1702           u16 error0 = SCTP_ERROR_ENQUEUED, next0 =
1703             SCTP_ESTABLISHED_PHASE_N_NEXT;
1704           u8 idx;
1705
1706           bi0 = from[0];
1707           to_next[0] = bi0;
1708           from += 1;
1709           to_next += 1;
1710           n_left_from -= 1;
1711           n_left_to_next -= 1;
1712
1713           b0 = vlib_get_buffer (vm, bi0);
1714           sctp_conn =
1715             sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1716                                  my_thread_index);
1717
1718           if (PREDICT_FALSE (sctp_conn == 0))
1719             {
1720               SCTP_DBG
1721                 ("sctp_conn == NULL; return SCTP_ERROR_INVALID_CONNECTION");
1722               error0 = SCTP_ERROR_INVALID_CONNECTION;
1723               goto done;
1724             }
1725           if (is_ip4)
1726             {
1727               ip4_hdr = vlib_buffer_get_current (b0);
1728               sctp_hdr = ip4_next_header (ip4_hdr);
1729               idx = sctp_sub_conn_id_via_ip4h (sctp_conn, ip4_hdr);
1730             }
1731           else
1732             {
1733               ip6_hdr = vlib_buffer_get_current (b0);
1734               sctp_hdr = ip6_next_header (ip6_hdr);
1735               idx = sctp_sub_conn_id_via_ip6h (sctp_conn, ip6_hdr);
1736             }
1737
1738           sctp_conn->sub_conn[idx].parent = sctp_conn;
1739
1740           sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1741           sctp_chunk_hdr =
1742             (sctp_chunks_common_hdr_t *) (&full_hdr->common_hdr);
1743
1744           u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1745
1746           switch (chunk_type)
1747             {
1748             case COOKIE_ECHO:
1749               error0 =
1750                 sctp_handle_cookie_echo (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1751                                          idx, b0, &next0);
1752               break;
1753
1754             case COOKIE_ACK:
1755               error0 =
1756                 sctp_handle_cookie_ack (sctp_hdr, sctp_chunk_hdr, sctp_conn,
1757                                         idx, b0, &next0);
1758               break;
1759
1760             case SACK:
1761               error0 =
1762                 sctp_handle_sack ((sctp_selective_ack_chunk_t *) sctp_hdr,
1763                                   sctp_conn, idx, b0, &next0);
1764               break;
1765
1766             case HEARTBEAT:
1767               error0 =
1768                 sctp_handle_heartbeat ((sctp_hb_req_chunk_t *) sctp_hdr,
1769                                        sctp_conn, idx, b0, &next0);
1770               break;
1771
1772             case HEARTBEAT_ACK:
1773               error0 =
1774                 sctp_handle_heartbeat_ack ((sctp_hb_ack_chunk_t *) sctp_hdr,
1775                                            sctp_conn, idx, b0, &next0);
1776               break;
1777
1778             case DATA:
1779               error0 =
1780                 sctp_handle_data ((sctp_payload_data_chunk_t *) sctp_hdr,
1781                                   sctp_conn, idx, b0, &next0);
1782               break;
1783
1784               /* All UNEXPECTED scenarios (wrong chunk received per state-machine)
1785                * are handled by the input-dispatcher function using the table-lookup
1786                * hence we should never get to the "default" case below.
1787                */
1788             default:
1789               error0 = SCTP_ERROR_UNKOWN_CHUNK;
1790               next0 = sctp_next_drop (is_ip4);
1791               goto done;
1792             }
1793
1794         done:
1795           b0->error = node->errors[error0];
1796           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1797             {
1798               sctp_rx_trace_t *t0 =
1799                 vlib_add_trace (vm, node, b0, sizeof (*t0));
1800               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
1801             }
1802
1803           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1804                                            n_left_to_next, bi0, next0);
1805         }
1806
1807       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1808     }
1809
1810   errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_SCTP,
1811                                                  my_thread_index);
1812
1813   sctp_node_inc_counter (vm, is_ip4, sctp4_established_phase_node.index,
1814                          sctp6_established_phase_node.index,
1815                          SCTP_ERROR_EVENT_FIFO_FULL, errors);
1816   sctp_flush_frame_to_output (vm, my_thread_index, is_ip4);
1817
1818   return from_frame->n_vectors;
1819 }
1820
1821 static uword
1822 sctp4_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1823                          vlib_frame_t * from_frame)
1824 {
1825   return sctp46_established_phase_inline (vm, node, from_frame,
1826                                           1 /* is_ip4 */ );
1827 }
1828
1829 static uword
1830 sctp6_established_phase (vlib_main_t * vm, vlib_node_runtime_t * node,
1831                          vlib_frame_t * from_frame)
1832 {
1833   return sctp46_established_phase_inline (vm, node, from_frame,
1834                                           0 /* is_ip4 */ );
1835 }
1836
1837 u8 *
1838 format_sctp_rx_trace (u8 * s, va_list * args)
1839 {
1840   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1841   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1842   sctp_rx_trace_t *t = va_arg (*args, sctp_rx_trace_t *);
1843   u32 indent = format_get_indent (s);
1844
1845   s = format (s, "%U\n%U%U",
1846               format_sctp_header, &t->sctp_header, 128,
1847               format_white_space, indent,
1848               format_sctp_connection, &t->sctp_connection, 1);
1849
1850   return s;
1851 }
1852
1853 /* *INDENT-OFF* */
1854 VLIB_REGISTER_NODE (sctp4_listen_phase_node) =
1855 {
1856   .function = sctp4_listen_phase,
1857   .name = "sctp4-listen",
1858   /* Takes a vector of packets. */
1859   .vector_size = sizeof (u32),
1860   .n_errors = SCTP_N_ERROR,
1861   .error_strings = sctp_error_strings,
1862   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1863   .next_nodes =
1864   {
1865 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1866     foreach_sctp_state_next
1867 #undef _
1868   },
1869   .format_trace = format_sctp_rx_trace_short,
1870 };
1871 /* *INDENT-ON* */
1872
1873 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_listen_phase_node, sctp4_listen_phase);
1874
1875 /* *INDENT-OFF* */
1876 VLIB_REGISTER_NODE (sctp6_listen_phase_node) =
1877 {
1878   .function = sctp6_listen_phase,
1879   .name = "sctp6-listen",
1880   /* Takes a vector of packets. */
1881   .vector_size = sizeof (u32),
1882   .n_errors = SCTP_N_ERROR,
1883   .error_strings = sctp_error_strings,
1884   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1885   .next_nodes =
1886   {
1887 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1888     foreach_sctp_state_next
1889 #undef _
1890   },
1891   .format_trace = format_sctp_rx_trace_short,
1892 };
1893 /* *INDENT-ON* */
1894
1895 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_listen_phase_node, sctp6_listen_phase);
1896
1897 /* *INDENT-OFF* */
1898 VLIB_REGISTER_NODE (sctp4_established_phase_node) =
1899 {
1900   .function = sctp4_established_phase,
1901   .name = "sctp4-established",
1902   /* Takes a vector of packets. */
1903   .vector_size = sizeof (u32),
1904   .n_errors = SCTP_N_ERROR,
1905   .error_strings = sctp_error_strings,
1906   .n_next_nodes = SCTP_ESTABLISHED_PHASE_N_NEXT,
1907   .next_nodes =
1908   {
1909 #define _(s,n) [SCTP_ESTABLISHED_PHASE_NEXT_##s] = n,
1910     foreach_sctp_state_next
1911 #undef _
1912   },
1913   .format_trace = format_sctp_rx_trace_short,
1914 };
1915 /* *INDENT-ON* */
1916
1917 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_established_phase_node,
1918                               sctp4_established_phase);
1919
1920 /* *INDENT-OFF* */
1921 VLIB_REGISTER_NODE (sctp6_established_phase_node) =
1922 {
1923   .function = sctp6_established_phase,
1924   .name = "sctp6-established",
1925   /* Takes a vector of packets. */
1926   .vector_size = sizeof (u32),
1927   .n_errors = SCTP_N_ERROR,
1928   .error_strings = sctp_error_strings,
1929   .n_next_nodes = SCTP_LISTEN_PHASE_N_NEXT,
1930   .next_nodes =
1931   {
1932 #define _(s,n) [SCTP_LISTEN_PHASE_NEXT_##s] = n,
1933     foreach_sctp_state_next
1934 #undef _
1935   },
1936   .format_trace = format_sctp_rx_trace_short,
1937 };
1938 /* *INDENT-ON* */
1939
1940 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_established_phase_node,
1941                               sctp6_established_phase);
1942
1943 /*
1944  * This is the function executed first for the SCTP graph.
1945  * It takes care of doing the initial message parsing and
1946  * dispatch to the specialized function.
1947  */
1948 always_inline uword
1949 sctp46_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
1950                          vlib_frame_t * from_frame, int is_ip4)
1951 {
1952   u32 n_left_from, next_index, *from, *to_next;
1953   u32 my_thread_index = vm->thread_index;
1954   u8 is_filtered;
1955   sctp_main_t *tm = vnet_get_sctp_main ();
1956
1957   from = vlib_frame_vector_args (from_frame);
1958   n_left_from = from_frame->n_vectors;
1959   next_index = node->cached_next_index;
1960   sctp_set_time_now (my_thread_index);
1961
1962   while (n_left_from > 0)
1963     {
1964       u32 n_left_to_next;
1965
1966       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1967
1968       while (n_left_from > 0 && n_left_to_next > 0)
1969         {
1970           int n_advance_bytes0, n_data_bytes0;
1971           u32 bi0, fib_index0;
1972           vlib_buffer_t *b0;
1973           sctp_header_t *sctp_hdr = 0;
1974           sctp_chunks_common_hdr_t *sctp_chunk_hdr = 0;
1975           sctp_connection_t *sctp_conn;
1976           transport_connection_t *trans_conn;
1977           ip4_header_t *ip4_hdr;
1978           ip6_header_t *ip6_hdr;
1979           u32 error0 = SCTP_ERROR_NO_LISTENER, next0 = SCTP_INPUT_NEXT_DROP;
1980
1981           bi0 = from[0];
1982           to_next[0] = bi0;
1983           from += 1;
1984           to_next += 1;
1985           n_left_from -= 1;
1986           n_left_to_next -= 1;
1987
1988           b0 = vlib_get_buffer (vm, bi0);
1989           vnet_buffer (b0)->tcp.flags = 0;
1990           fib_index0 = vnet_buffer (b0)->ip.fib_index;
1991
1992           /* Checksum computed by ipx_local no need to compute again */
1993
1994           if (is_ip4)
1995             {
1996               ip4_hdr = vlib_buffer_get_current (b0);
1997               sctp_hdr = ip4_next_header (ip4_hdr);
1998
1999               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2000               sctp_chunk_hdr = &full_hdr->common_hdr;
2001
2002               n_advance_bytes0 =
2003                 (ip4_header_bytes (ip4_hdr) +
2004                  sizeof (sctp_payload_data_chunk_t));
2005               n_data_bytes0 =
2006                 clib_net_to_host_u16 (ip4_hdr->length) - n_advance_bytes0;
2007
2008               trans_conn = session_lookup_connection_wt4 (fib_index0,
2009                                                           &ip4_hdr->dst_address,
2010                                                           &ip4_hdr->src_address,
2011                                                           sctp_hdr->dst_port,
2012                                                           sctp_hdr->src_port,
2013                                                           TRANSPORT_PROTO_SCTP,
2014                                                           my_thread_index,
2015                                                           &is_filtered);
2016             }
2017           else
2018             {
2019               ip6_hdr = vlib_buffer_get_current (b0);
2020               sctp_hdr = ip6_next_header (ip6_hdr);
2021
2022               sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
2023               sctp_chunk_hdr = &full_hdr->common_hdr;
2024
2025               n_advance_bytes0 = sctp_header_bytes ();
2026               n_data_bytes0 =
2027                 clib_net_to_host_u16 (ip6_hdr->payload_length) -
2028                 n_advance_bytes0;
2029               n_advance_bytes0 += sizeof (ip6_hdr[0]);
2030
2031               trans_conn = session_lookup_connection_wt6 (fib_index0,
2032                                                           &ip6_hdr->dst_address,
2033                                                           &ip6_hdr->src_address,
2034                                                           sctp_hdr->dst_port,
2035                                                           sctp_hdr->src_port,
2036                                                           TRANSPORT_PROTO_SCTP,
2037                                                           my_thread_index,
2038                                                           &is_filtered);
2039             }
2040
2041           /* Length check */
2042           if (PREDICT_FALSE (n_advance_bytes0 < 0))
2043             {
2044               error0 = SCTP_ERROR_LENGTH;
2045               goto done;
2046             }
2047
2048           sctp_conn = sctp_get_connection_from_transport (trans_conn);
2049           vnet_sctp_common_hdr_params_net_to_host (sctp_chunk_hdr);
2050
2051           u8 chunk_type = vnet_sctp_get_chunk_type (sctp_chunk_hdr);
2052           if (chunk_type >= UNKNOWN)
2053             {
2054               clib_warning
2055                 ("Received an unrecognized chunk... something is really bad.");
2056               error0 = SCTP_ERROR_UNKOWN_CHUNK;
2057               next0 = SCTP_INPUT_NEXT_DROP;
2058               goto done;
2059             }
2060
2061 #if SCTP_DEBUG_STATE_MACHINE
2062           u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
2063 #endif
2064           vnet_buffer (b0)->sctp.hdr_offset =
2065             (u8 *) sctp_hdr - (u8 *) vlib_buffer_get_current (b0);
2066
2067           /* Session exists */
2068           if (PREDICT_TRUE (0 != sctp_conn))
2069             {
2070               /* Save connection index */
2071               vnet_buffer (b0)->sctp.connection_index = trans_conn->c_index;
2072               vnet_buffer (b0)->sctp.data_offset = n_advance_bytes0;
2073               vnet_buffer (b0)->sctp.data_len = n_data_bytes0;
2074
2075               next0 = tm->dispatch_table[sctp_conn->state][chunk_type].next;
2076               error0 = tm->dispatch_table[sctp_conn->state][chunk_type].error;
2077
2078               SCTP_DBG_STATE_MACHINE ("CONNECTION_INDEX = %u: "
2079                                       "CURRENT_CONNECTION_STATE = %s,"
2080                                       "CHUNK_TYPE_RECEIVED = %s "
2081                                       "NEXT_PHASE = %s",
2082                                       sctp_conn->sub_conn
2083                                       [idx].connection.c_index,
2084                                       sctp_state_to_string (sctp_conn->state),
2085                                       sctp_chunk_to_string (chunk_type),
2086                                       phase_to_string (next0));
2087
2088               if (chunk_type == DATA)
2089                 SCTP_ADV_DBG ("n_advance_bytes0 = %u, n_data_bytes0 = %u",
2090                               n_advance_bytes0, n_data_bytes0);
2091
2092             }
2093           else
2094             {
2095               if (is_filtered)
2096                 {
2097                   next0 = SCTP_INPUT_NEXT_DROP;
2098                   error0 = SCTP_ERROR_FILTERED;
2099                 }
2100               else if ((is_ip4 && tm->punt_unknown4) ||
2101                        (!is_ip4 && tm->punt_unknown6))
2102                 {
2103                   next0 = SCTP_INPUT_NEXT_PUNT_PHASE;
2104                   error0 = SCTP_ERROR_PUNT;
2105                 }
2106               else
2107                 {
2108                   next0 = SCTP_INPUT_NEXT_DROP;
2109                   error0 = SCTP_ERROR_NO_LISTENER;
2110                 }
2111               SCTP_DBG_STATE_MACHINE ("sctp_conn == NULL, NEXT_PHASE = %s",
2112                                       phase_to_string (next0));
2113               sctp_conn = 0;
2114             }
2115
2116         done:
2117           b0->error = error0 ? node->errors[error0] : 0;
2118
2119           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2120             {
2121               sctp_rx_trace_t *t0 =
2122                 vlib_add_trace (vm, node, b0, sizeof (*t0));
2123               sctp_set_rx_trace_data (t0, sctp_conn, sctp_hdr, b0, is_ip4);
2124             }
2125           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2126                                            n_left_to_next, bi0, next0);
2127         }
2128
2129       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2130     }
2131   return from_frame->n_vectors;
2132 }
2133
2134 static uword
2135 sctp4_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2136                         vlib_frame_t * from_frame)
2137 {
2138   return sctp46_input_dispatcher (vm, node, from_frame, 1 /* is_ip4 */ );
2139 }
2140
2141 static uword
2142 sctp6_input_dispatcher (vlib_main_t * vm, vlib_node_runtime_t * node,
2143                         vlib_frame_t * from_frame)
2144 {
2145   return sctp46_input_dispatcher (vm, node, from_frame, 0 /* is_ip4 */ );
2146 }
2147
2148 /* *INDENT-OFF* */
2149 VLIB_REGISTER_NODE (sctp4_input_node) =
2150 {
2151   .function = sctp4_input_dispatcher,
2152   .name = "sctp4-input",
2153   /* Takes a vector of packets. */
2154   .vector_size = sizeof (u32),
2155   .n_errors = SCTP_N_ERROR,
2156   .error_strings = sctp_error_strings,
2157   .n_next_nodes = SCTP_INPUT_N_NEXT,
2158   .next_nodes =
2159   {
2160 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2161     foreach_sctp4_input_next
2162 #undef _
2163   },
2164   .format_buffer = format_sctp_header,
2165   .format_trace = format_sctp_rx_trace,
2166 };
2167 /* *INDENT-ON* */
2168
2169 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_input_node, sctp4_input_dispatcher);
2170
2171 /* *INDENT-OFF* */
2172 VLIB_REGISTER_NODE (sctp6_input_node) =
2173 {
2174   .function = sctp6_input_dispatcher,
2175   .name = "sctp6-input",
2176   /* Takes a vector of packets. */
2177   .vector_size = sizeof (u32),
2178   .n_errors = SCTP_N_ERROR,
2179   .error_strings = sctp_error_strings,
2180   .n_next_nodes = SCTP_INPUT_N_NEXT,
2181   .next_nodes =
2182   {
2183 #define _(s,n) [SCTP_INPUT_NEXT_##s] = n,
2184     foreach_sctp6_input_next
2185 #undef _
2186   },
2187   .format_buffer = format_sctp_header,
2188   .format_trace = format_sctp_rx_trace,
2189 };
2190 /* *INDENT-ON* */
2191
2192 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_input_node, sctp6_input_dispatcher);
2193
2194 vlib_node_registration_t sctp4_input_node;
2195 vlib_node_registration_t sctp6_input_node;
2196
2197 static void
2198 sctp_dispatch_table_init (sctp_main_t * tm)
2199 {
2200   int i, j;
2201   for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
2202     for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
2203       {
2204         tm->dispatch_table[i][j].next = SCTP_INPUT_NEXT_DROP;
2205         tm->dispatch_table[i][j].error = SCTP_ERROR_DISPATCH;
2206       }
2207
2208 #define _(t,f,n,e)                                              \
2209 do {                                                            \
2210     tm->dispatch_table[SCTP_STATE_##t][f].next = (n);           \
2211     tm->dispatch_table[SCTP_STATE_##t][f].error = (e);          \
2212 } while (0)
2213
2214   /*
2215    * SCTP STATE-MACHINE states:
2216    *
2217    * _(CLOSED, "CLOSED")                         \
2218    * _(COOKIE_WAIT, "COOKIE_WAIT")               \
2219    * _(COOKIE_ECHOED, "COOKIE_ECHOED")           \
2220    * _(ESTABLISHED, "ESTABLISHED")               \
2221    * _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING")     \
2222    * _(SHUTDOWN_SENT, "SHUTDOWN_SENT")           \
2223    * _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED")   \
2224    * _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
2225    */
2226   _(CLOSED, DATA, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);       /* UNEXPECTED DATA chunk which requires special handling */
2227   _(CLOSED, INIT, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2228   _(CLOSED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);        /* UNEXPECTED INIT_ACK chunk */
2229   _(CLOSED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);       /* UNEXPECTED SACK chunk */
2230   _(CLOSED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT chunk */
2231   _(CLOSED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);     /* UNEXPECTED HEARTBEAT_ACK chunk */
2232   _(CLOSED, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2233   _(CLOSED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN chunk */
2234   _(CLOSED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);       /* UNEXPECTED SHUTDOWN_ACK chunk */
2235   _(CLOSED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);       /* UNEXPECTED OPERATION_ERROR chunk */
2236   _(CLOSED, COOKIE_ECHO, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2237   _(CLOSED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED COOKIE_ACK chunk */
2238   _(CLOSED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);     /* UNEXPECTED ECNE chunk */
2239   _(CLOSED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);       /* UNEXPECTED CWR chunk */
2240   _(CLOSED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);   /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2241
2242   _(COOKIE_WAIT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2243   _(COOKIE_WAIT, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);     /* UNEXPECTED INIT chunk which requires special handling */
2244   _(COOKIE_WAIT, INIT_ACK, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2245   _(COOKIE_WAIT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);  /* UNEXPECTED SACK chunk */
2246   _(COOKIE_WAIT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT chunk */
2247   _(COOKIE_WAIT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);        /* UNEXPECTED HEARTBEAT_ACK chunk */
2248   _(COOKIE_WAIT, ABORT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);
2249   _(COOKIE_WAIT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN chunk */
2250   _(COOKIE_WAIT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2251   _(COOKIE_WAIT, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2252   _(COOKIE_WAIT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2253   _(COOKIE_WAIT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2254   _(COOKIE_WAIT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2255   _(COOKIE_WAIT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2256   _(COOKIE_WAIT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2257
2258   _(COOKIE_ECHOED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_NONE);
2259   _(COOKIE_ECHOED, INIT, SCTP_INPUT_NEXT_RCV_PHASE, SCTP_ERROR_NONE);   /* UNEXPECTED INIT chunk which requires special handling */
2260   _(COOKIE_ECHOED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2261   _(COOKIE_ECHOED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2262   _(COOKIE_ECHOED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2263   _(COOKIE_ECHOED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2264   _(COOKIE_ECHOED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2265   _(COOKIE_ECHOED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN chunk */
2266   _(COOKIE_ECHOED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);        /* UNEXPECTED SHUTDOWN_ACK chunk */
2267   _(COOKIE_ECHOED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);        /* UNEXPECTED OPERATION_ERROR chunk */
2268   _(COOKIE_ECHOED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2269   _(COOKIE_ECHOED, COOKIE_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2270     SCTP_ERROR_NONE);
2271   _(COOKIE_ECHOED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2272   _(COOKIE_ECHOED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2273   _(COOKIE_ECHOED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2274
2275   _(ESTABLISHED, DATA, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2276   _(ESTABLISHED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);  /* UNEXPECTED INIT chunk */
2277   _(ESTABLISHED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED INIT_ACK chunk */
2278   _(ESTABLISHED, SACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE, SCTP_ERROR_NONE);
2279   _(ESTABLISHED, HEARTBEAT, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2280     SCTP_ERROR_NONE);
2281   _(ESTABLISHED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_ESTABLISHED_PHASE,
2282     SCTP_ERROR_NONE);
2283   _(ESTABLISHED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);        /* UNEXPECTED ABORT chunk */
2284   _(ESTABLISHED, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2285   _(ESTABLISHED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);  /* UNEXPECTED SHUTDOWN_ACK chunk */
2286   _(ESTABLISHED, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);  /* UNEXPECTED OPERATION_ERROR chunk */
2287   _(ESTABLISHED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);  /* UNEXPECTED COOKIE_ECHO chunk */
2288   _(ESTABLISHED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED COOKIE_ACK chunk */
2289   _(ESTABLISHED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);        /* UNEXPECTED ECNE chunk */
2290   _(ESTABLISHED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);  /* UNEXPECTED CWR chunk */
2291   _(ESTABLISHED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);      /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2292
2293   _(SHUTDOWN_PENDING, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2294   _(SHUTDOWN_PENDING, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);     /* UNEXPECTED INIT chunk */
2295   _(SHUTDOWN_PENDING, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);      /* UNEXPECTED INIT_ACK chunk */
2296   _(SHUTDOWN_PENDING, SACK, SCTP_INPUT_NEXT_LISTEN_PHASE, SCTP_ERROR_NONE);
2297   _(SHUTDOWN_PENDING, HEARTBEAT, SCTP_INPUT_NEXT_LISTEN_PHASE,
2298     SCTP_ERROR_NONE);
2299   _(SHUTDOWN_PENDING, HEARTBEAT_ACK, SCTP_INPUT_NEXT_LISTEN_PHASE,
2300     SCTP_ERROR_NONE);
2301   _(SHUTDOWN_PENDING, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);   /* UNEXPECTED ABORT chunk */
2302   _(SHUTDOWN_PENDING, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2303     SCTP_ERROR_NONE);
2304   _(SHUTDOWN_PENDING, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);     /* UNEXPECTED SHUTDOWN_ACK chunk */
2305   _(SHUTDOWN_PENDING, OPERATION_ERROR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_OPERATION_ERROR_VIOLATION);     /* UNEXPECTED OPERATION_ERROR chunk */
2306   _(SHUTDOWN_PENDING, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);     /* UNEXPECTED COOKIE_ECHO chunk */
2307   _(SHUTDOWN_PENDING, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);    /* UNEXPECTED COOKIE_ACK chunk */
2308   _(SHUTDOWN_PENDING, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);   /* UNEXPECTED ECNE chunk */
2309   _(SHUTDOWN_PENDING, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);     /* UNEXPECTED CWR chunk */
2310   _(SHUTDOWN_PENDING, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION); /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2311
2312   _(SHUTDOWN_SENT, DATA, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2313   _(SHUTDOWN_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);        /* UNEXPECTED INIT chunk */
2314   _(SHUTDOWN_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP); /* UNEXPECTED INIT_ACK chunk */
2315   _(SHUTDOWN_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);        /* UNEXPECTED SACK chunk */
2316   _(SHUTDOWN_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT chunk */
2317   _(SHUTDOWN_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);      /* UNEXPECTED HEARTBEAT_ACK chunk */
2318   _(SHUTDOWN_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);      /* UNEXPECTED ABORT chunk */
2319   _(SHUTDOWN_SENT, SHUTDOWN, SCTP_INPUT_NEXT_SHUTDOWN_PHASE, SCTP_ERROR_NONE);
2320   _(SHUTDOWN_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2321     SCTP_ERROR_NONE);
2322   _(SHUTDOWN_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);        /* UNEXPECTED COOKIE_ECHO chunk */
2323   _(SHUTDOWN_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);       /* UNEXPECTED COOKIE_ACK chunk */
2324   _(SHUTDOWN_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);      /* UNEXPECTED ECNE chunk */
2325   _(SHUTDOWN_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);        /* UNEXPECTED CWR chunk */
2326   _(SHUTDOWN_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);    /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2327
2328   _(SHUTDOWN_RECEIVED, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2329   _(SHUTDOWN_RECEIVED, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2330   _(SHUTDOWN_RECEIVED, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2331   _(SHUTDOWN_RECEIVED, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2332   _(SHUTDOWN_RECEIVED, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2333   _(SHUTDOWN_RECEIVED, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2334   _(SHUTDOWN_RECEIVED, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2335   _(SHUTDOWN_RECEIVED, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2336   _(SHUTDOWN_RECEIVED, SHUTDOWN_ACK, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2337     SCTP_ERROR_NONE);
2338   _(SHUTDOWN_RECEIVED, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2339   _(SHUTDOWN_RECEIVED, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2340   _(SHUTDOWN_RECEIVED, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2341   _(SHUTDOWN_RECEIVED, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2342   _(SHUTDOWN_RECEIVED, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_COMPLETE_VIOLATION);        /* UNEXPECTED SHUTDOWN_COMPLETE chunk */
2343
2344   _(SHUTDOWN_ACK_SENT, DATA, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_DATA_CHUNK_VIOLATION);    /* UNEXPECTED DATA chunk */
2345   _(SHUTDOWN_ACK_SENT, INIT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_INIT_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2346   _(SHUTDOWN_ACK_SENT, INIT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);     /* UNEXPECTED INIT_ACK chunk */
2347   _(SHUTDOWN_ACK_SENT, SACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SACK_CHUNK_VIOLATION);    /* UNEXPECTED INIT chunk */
2348   _(SHUTDOWN_ACK_SENT, HEARTBEAT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT chunk */
2349   _(SHUTDOWN_ACK_SENT, HEARTBEAT_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_HEARTBEAT_ACK_CHUNK_VIOLATION);  /* UNEXPECTED HEARTBEAT_ACK chunk */
2350   _(SHUTDOWN_ACK_SENT, ABORT, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ABORT_CHUNK_VIOLATION);  /* UNEXPECTED ABORT chunk */
2351   _(SHUTDOWN_ACK_SENT, SHUTDOWN, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN chunk */
2352   _(SHUTDOWN_ACK_SENT, SHUTDOWN_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_SHUTDOWN_ACK_CHUNK_VIOLATION);    /* UNEXPECTED SHUTDOWN_ACK chunk */
2353   _(SHUTDOWN_ACK_SENT, COOKIE_ECHO, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_COOKIE_ECHO_VIOLATION);    /* UNEXPECTED COOKIE_ECHO chunk */
2354   _(SHUTDOWN_ACK_SENT, COOKIE_ACK, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ACK_DUP);   /* UNEXPECTED COOKIE_ACK chunk */
2355   _(SHUTDOWN_ACK_SENT, ECNE, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_ECNE_VIOLATION);  /* UNEXPECTED ECNE chunk */
2356   _(SHUTDOWN_ACK_SENT, CWR, SCTP_INPUT_NEXT_DROP, SCTP_ERROR_CWR_VIOLATION);    /* UNEXPECTED CWR chunk */
2357   _(SHUTDOWN_ACK_SENT, SHUTDOWN_COMPLETE, SCTP_INPUT_NEXT_SHUTDOWN_PHASE,
2358     SCTP_ERROR_NONE);
2359
2360   /* TODO: Handle COOKIE ECHO when a TCB Exists */
2361
2362 #undef _
2363 }
2364
2365 clib_error_t *
2366 sctp_input_init (vlib_main_t * vm)
2367 {
2368   clib_error_t *error = 0;
2369   sctp_main_t *tm = vnet_get_sctp_main ();
2370
2371   if ((error = vlib_call_init_function (vm, sctp_init)))
2372     return error;
2373
2374   /* Initialize dispatch table. */
2375   sctp_dispatch_table_init (tm);
2376
2377   return error;
2378 }
2379
2380 VLIB_INIT_FUNCTION (sctp_input_init);
2381
2382 /*
2383  * fd.io coding-style-patch-verification: ON
2384  *
2385  * Local Variables:
2386  * eval: (c-set-style "gnu")
2387  * End:
2388  */