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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
15 #include <vnet/sctp/sctp.h>
16 #include <vnet/sctp/sctp_debug.h>
17 #include <vppinfra/random.h>
18 #include <openssl/hmac.h>
20 vlib_node_registration_t sctp4_output_node;
21 vlib_node_registration_t sctp6_output_node;
23 typedef enum _sctp_output_next
25 SCTP_OUTPUT_NEXT_DROP,
26 SCTP_OUTPUT_NEXT_IP_LOOKUP,
30 #define foreach_sctp4_output_next \
31 _ (DROP, "error-drop") \
32 _ (IP_LOOKUP, "ip4-lookup")
34 #define foreach_sctp6_output_next \
35 _ (DROP, "error-drop") \
36 _ (IP_LOOKUP, "ip6-lookup")
38 static char *sctp_error_strings[] = {
39 #define sctp_error(n,s) s,
40 #include <vnet/sctp/sctp_error.def>
46 sctp_header_t sctp_header;
47 sctp_connection_t sctp_connection;
51 * Flush tx frame populated by retransmits and timer pops
54 sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
56 if (sctp_main.tx_frames[!is_ip4][thread_index])
59 next_index = is_ip4 ? sctp4_output_node.index : sctp6_output_node.index;
60 vlib_put_frame_to_node (vm, next_index,
61 sctp_main.tx_frames[!is_ip4][thread_index]);
62 sctp_main.tx_frames[!is_ip4][thread_index] = 0;
67 * Flush ip lookup tx frames populated by timer pops
70 sctp_flush_frame_to_ip_lookup (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
72 if (sctp_main.ip_lookup_tx_frames[!is_ip4][thread_index])
75 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
76 vlib_put_frame_to_node (vm, next_index,
77 sctp_main.ip_lookup_tx_frames[!is_ip4]
79 sctp_main.ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
84 * Flush v4 and v6 sctp and ip-lookup tx frames for thread index
87 sctp_flush_frames_to_output (u8 thread_index)
89 vlib_main_t *vm = vlib_get_main ();
90 sctp_flush_frame_to_output (vm, thread_index, 1);
91 sctp_flush_frame_to_output (vm, thread_index, 0);
92 sctp_flush_frame_to_ip_lookup (vm, thread_index, 1);
93 sctp_flush_frame_to_ip_lookup (vm, thread_index, 0);
97 ip4_sctp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
101 u32 ip_header_length, payload_length_host_byte_order;
102 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
103 void *data_this_buffer;
105 /* Initialize checksum with ip header. */
106 ip_header_length = ip4_header_bytes (ip0);
107 payload_length_host_byte_order =
108 clib_net_to_host_u16 (ip0->length) - ip_header_length;
110 clib_host_to_net_u32 (payload_length_host_byte_order +
111 (ip0->protocol << 16));
113 if (BITS (uword) == 32)
116 ip_csum_with_carry (checksum,
117 clib_mem_unaligned (&ip0->src_address, u32));
119 ip_csum_with_carry (checksum,
120 clib_mem_unaligned (&ip0->dst_address, u32));
124 ip_csum_with_carry (checksum,
125 clib_mem_unaligned (&ip0->src_address, u64));
127 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
128 data_this_buffer = (void *) ip0 + ip_header_length;
129 n_ip_bytes_this_buffer =
130 p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
131 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
133 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
134 n_ip_bytes_this_buffer - ip_header_length : 0;
139 ip_incremental_checksum (checksum, data_this_buffer, n_this_buffer);
140 n_bytes_left -= n_this_buffer;
141 if (n_bytes_left == 0)
144 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
145 p0 = vlib_get_buffer (vm, p0->next_buffer);
146 data_this_buffer = vlib_buffer_get_current (p0);
147 n_this_buffer = p0->current_length;
154 ip6_sctp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
155 ip6_header_t * ip0, int *bogus_lengthp)
158 u16 payload_length_host_byte_order;
159 u32 i, n_this_buffer, n_bytes_left;
160 u32 headers_size = sizeof (ip0[0]);
161 void *data_this_buffer;
163 ASSERT (bogus_lengthp);
166 /* Initialize checksum with ip header. */
167 checksum = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
168 payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
169 data_this_buffer = (void *) (ip0 + 1);
171 for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
173 checksum = ip_csum_with_carry (checksum,
174 clib_mem_unaligned (&ip0->
178 ip_csum_with_carry (checksum,
179 clib_mem_unaligned (&ip0->dst_address.as_uword[i],
183 /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets)
184 * or UDP-Ping packets */
185 if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
188 ip6_hop_by_hop_ext_t *ext_hdr =
189 (ip6_hop_by_hop_ext_t *) data_this_buffer;
191 /* validate really icmp6 next */
192 ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_SCTP));
194 skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
195 data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
197 payload_length_host_byte_order -= skip_bytes;
198 headers_size += skip_bytes;
201 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
202 if (p0 && n_this_buffer + headers_size > p0->current_length)
205 headers_size ? p0->current_length - headers_size : 0;
209 ip_incremental_checksum (checksum, data_this_buffer, n_this_buffer);
210 n_bytes_left -= n_this_buffer;
211 if (n_bytes_left == 0)
214 if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
219 p0 = vlib_get_buffer (vm, p0->next_buffer);
220 data_this_buffer = vlib_buffer_get_current (p0);
221 n_this_buffer = p0->current_length;
228 sctp_push_ip_hdr (sctp_main_t * tm, sctp_sub_connection_t * sctp_sub_conn,
231 sctp_header_t *th = vlib_buffer_get_current (b);
232 vlib_main_t *vm = vlib_get_main ();
233 if (sctp_sub_conn->c_is_ip4)
236 ih = vlib_buffer_push_ip4 (vm, b, &sctp_sub_conn->c_lcl_ip4,
237 &sctp_sub_conn->c_rmt_ip4, IP_PROTOCOL_SCTP,
239 th->checksum = ip4_sctp_compute_checksum (vm, b, ih);
246 ih = vlib_buffer_push_ip6 (vm, b, &sctp_sub_conn->c_lcl_ip6,
247 &sctp_sub_conn->c_rmt_ip6, IP_PROTOCOL_SCTP);
248 th->checksum = ip6_sctp_compute_checksum (vm, b, ih, &bogus);
254 sctp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
256 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
257 vlib_buffer_free_one (vm, b->next_buffer);
258 /* Zero all flags but free list index and trace flag */
259 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
261 b->current_length = 0;
262 b->total_length_not_including_first_buffer = 0;
263 vnet_buffer (b)->sctp.flags = 0;
265 /* Leave enough space for headers */
266 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
270 sctp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
272 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
273 b->flags &= VLIB_BUFFER_FREE_LIST_INDEX_MASK;
274 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
275 b->total_length_not_including_first_buffer = 0;
276 vnet_buffer (b)->sctp.flags = 0;
277 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
278 /* Leave enough space for headers */
279 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
283 sctp_alloc_tx_buffers (sctp_main_t * tm, u8 thread_index, u32 n_free_buffers)
285 vlib_main_t *vm = vlib_get_main ();
286 u32 current_length = vec_len (tm->tx_buffers[thread_index]);
289 vec_validate (tm->tx_buffers[thread_index],
290 current_length + n_free_buffers - 1);
292 vlib_buffer_alloc (vm, &tm->tx_buffers[thread_index][current_length],
294 _vec_len (tm->tx_buffers[thread_index]) = current_length + n_allocated;
295 /* buffer shortage, report failure */
296 if (vec_len (tm->tx_buffers[thread_index]) == 0)
298 clib_warning ("out of buffers");
305 sctp_get_free_buffer_index (sctp_main_t * tm, u32 * bidx)
308 u32 thread_index = vlib_get_thread_index ();
309 if (PREDICT_FALSE (vec_len (tm->tx_buffers[thread_index]) == 0))
311 if (sctp_alloc_tx_buffers (tm, thread_index, VLIB_FRAME_SIZE))
314 my_tx_buffers = tm->tx_buffers[thread_index];
315 *bidx = my_tx_buffers[vec_len (my_tx_buffers) - 1];
316 _vec_len (my_tx_buffers) -= 1;
321 sctp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
324 sctp_main_t *tm = vnet_get_sctp_main ();
325 u32 thread_index = vlib_get_thread_index ();
326 u32 *to_next, next_index;
329 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
332 /* Decide where to send the packet */
333 next_index = is_ip4 ? sctp4_output_node.index : sctp6_output_node.index;
334 sctp_trajectory_add_start (b, 2);
336 /* Get frame to v4/6 output node */
337 f = tm->tx_frames[!is_ip4][thread_index];
340 f = vlib_get_frame_to_node (vm, next_index);
342 tm->tx_frames[!is_ip4][thread_index] = f;
344 to_next = vlib_frame_vector_args (f);
345 to_next[f->n_vectors] = bi;
347 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
349 vlib_put_frame_to_node (vm, next_index, f);
350 tm->tx_frames[!is_ip4][thread_index] = 0;
355 sctp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
358 sctp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
362 sctp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
365 sctp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
369 sctp_enqueue_to_ip_lookup_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
372 sctp_main_t *tm = vnet_get_sctp_main ();
373 u32 thread_index = vlib_get_thread_index ();
374 u32 *to_next, next_index;
377 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
380 /* Default FIB for now */
381 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
383 /* Send to IP lookup */
384 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
385 if (VLIB_BUFFER_TRACE_TRAJECTORY > 0)
388 b->pre_data[1] = next_index;
391 f = tm->ip_lookup_tx_frames[!is_ip4][thread_index];
394 f = vlib_get_frame_to_node (vm, next_index);
396 tm->ip_lookup_tx_frames[!is_ip4][thread_index] = f;
399 to_next = vlib_frame_vector_args (f);
400 to_next[f->n_vectors] = bi;
402 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
404 vlib_put_frame_to_node (vm, next_index, f);
405 tm->ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
410 sctp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
413 sctp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, 0);
417 * Convert buffer to INIT
420 sctp_prepare_init_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
422 u32 random_seed = random_default_seed ();
423 u16 alloc_bytes = sizeof (sctp_init_chunk_t);
424 sctp_sub_connection_t *sub_conn =
425 &sctp_conn->sub_conn[sctp_pick_conn_idx_on_chunk (INIT)];
427 sctp_ipv4_addr_param_t *ip4_param = 0;
428 sctp_ipv6_addr_param_t *ip6_param = 0;
430 if (sub_conn->c_is_ip4)
431 alloc_bytes += sizeof (sctp_ipv4_addr_param_t);
433 alloc_bytes += sizeof (sctp_ipv6_addr_param_t);
435 /* As per RFC 4960 the chunk_length value does NOT contemplate
436 * the size of the first header (see sctp_header_t) and any padding
438 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
440 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
442 sctp_init_chunk_t *init_chunk = vlib_buffer_push_uninit (b, alloc_bytes);
444 u16 pointer_offset = sizeof (init_chunk);
445 if (sub_conn->c_is_ip4)
447 ip4_param = (sctp_ipv4_addr_param_t *) init_chunk + pointer_offset;
448 ip4_param->address.as_u32 = sub_conn->c_lcl_ip.ip4.as_u32;
450 pointer_offset += sizeof (sctp_ipv4_addr_param_t);
454 ip6_param = (sctp_ipv6_addr_param_t *) init_chunk + pointer_offset;
455 ip6_param->address.as_u64[0] = sub_conn->c_lcl_ip.ip6.as_u64[0];
456 ip6_param->address.as_u64[1] = sub_conn->c_lcl_ip.ip6.as_u64[1];
458 pointer_offset += sizeof (sctp_ipv6_addr_param_t);
461 init_chunk->sctp_hdr.src_port = sub_conn->c_lcl_port; /* No need of host_to_net conversion, already in net-byte order */
462 init_chunk->sctp_hdr.dst_port = sub_conn->c_rmt_port; /* No need of host_to_net conversion, already in net-byte order */
463 init_chunk->sctp_hdr.checksum = 0;
464 /* The sender of an INIT must set the VERIFICATION_TAG to 0 as per RFC 4960 Section 8.5.1 */
465 init_chunk->sctp_hdr.verification_tag = 0x0;
467 vnet_sctp_set_chunk_type (&init_chunk->chunk_hdr, INIT);
468 vnet_sctp_set_chunk_length (&init_chunk->chunk_hdr, chunk_len);
469 vnet_sctp_common_hdr_params_host_to_net (&init_chunk->chunk_hdr);
471 init_chunk->a_rwnd = clib_host_to_net_u32 (DEFAULT_A_RWND);
472 init_chunk->initiate_tag = clib_host_to_net_u32 (random_u32 (&random_seed));
473 init_chunk->inboud_streams_count =
474 clib_host_to_net_u16 (INBOUND_STREAMS_COUNT);
475 init_chunk->outbound_streams_count =
476 clib_host_to_net_u16 (OUTBOUND_STREAMS_COUNT);
478 init_chunk->initial_tsn =
479 clib_host_to_net_u32 (sctp_conn->local_initial_tsn);
480 SCTP_CONN_TRACKING_DBG ("sctp_conn->local_initial_tsn = %u",
481 sctp_conn->local_initial_tsn);
483 sctp_conn->local_tag = init_chunk->initiate_tag;
485 vnet_buffer (b)->sctp.connection_index = sub_conn->c_c_index;
487 SCTP_DBG_STATE_MACHINE ("CONN_INDEX = %u, CURR_CONN_STATE = %u (%s), "
489 "SRC_PORT = %u, DST_PORT = %u",
490 sub_conn->connection.c_index,
492 sctp_state_to_string (sctp_conn->state),
493 sctp_chunk_to_string (INIT),
494 init_chunk->sctp_hdr.src_port,
495 init_chunk->sctp_hdr.dst_port);
499 sctp_compute_mac (sctp_connection_t * sctp_conn,
500 sctp_state_cookie_param_t * state_cookie)
502 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
506 const EVP_MD *md = EVP_sha1 ();
508 unsigned int len = 0;
510 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
511 ctx = HMAC_CTX_new ();
512 HMAC_Init_ex (&ctx, &state_cookie->creation_time,
513 sizeof (state_cookie->creation_time), md, NULL);
514 HMAC_Update (ctx, (const unsigned char *) &sctp_conn, sizeof (sctp_conn));
515 HMAC_Final (ctx, state_cookie->mac, &len);
517 HMAC_CTX_init (&ctx);
518 HMAC_Init_ex (&ctx, &state_cookie->creation_time,
519 sizeof (state_cookie->creation_time), md, NULL);
521 HMAC_Update (&ctx, (const unsigned char *) &sctp_conn, sizeof (sctp_conn));
522 HMAC_Final (&ctx, state_cookie->mac, &len);
523 HMAC_CTX_cleanup (&ctx);
526 ENDIANESS_SWAP (state_cookie->mac);
530 sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn,
533 vlib_main_t *vm = vlib_get_main ();
534 u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ACK);
536 sctp_reuse_buffer (vm, b);
538 u16 alloc_bytes = sizeof (sctp_cookie_ack_chunk_t);
540 /* As per RFC 4960 the chunk_length value does NOT contemplate
541 * the size of the first header (see sctp_header_t) and any padding
543 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
545 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
547 sctp_cookie_ack_chunk_t *cookie_ack_chunk =
548 vlib_buffer_push_uninit (b, alloc_bytes);
550 cookie_ack_chunk->sctp_hdr.checksum = 0;
551 cookie_ack_chunk->sctp_hdr.src_port =
552 sctp_conn->sub_conn[idx].connection.lcl_port;
553 cookie_ack_chunk->sctp_hdr.dst_port =
554 sctp_conn->sub_conn[idx].connection.rmt_port;
555 cookie_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
556 vnet_sctp_set_chunk_type (&cookie_ack_chunk->chunk_hdr, COOKIE_ACK);
557 vnet_sctp_set_chunk_length (&cookie_ack_chunk->chunk_hdr, chunk_len);
559 /* Measure RTT with this */
560 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
562 vnet_buffer (b)->sctp.connection_index =
563 sctp_conn->sub_conn[idx].connection.c_index;
567 sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn,
569 sctp_state_cookie_param_t * sc)
571 vlib_main_t *vm = vlib_get_main ();
572 u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ECHO);
574 sctp_reuse_buffer (vm, b);
576 /* The minimum size of the message is given by the sctp_init_ack_chunk_t */
577 u16 alloc_bytes = sizeof (sctp_cookie_echo_chunk_t);
578 /* As per RFC 4960 the chunk_length value does NOT contemplate
579 * the size of the first header (see sctp_header_t) and any padding
581 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
582 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
583 sctp_cookie_echo_chunk_t *cookie_echo_chunk =
584 vlib_buffer_push_uninit (b, alloc_bytes);
585 cookie_echo_chunk->sctp_hdr.checksum = 0;
586 cookie_echo_chunk->sctp_hdr.src_port =
587 sctp_conn->sub_conn[idx].connection.lcl_port;
588 cookie_echo_chunk->sctp_hdr.dst_port =
589 sctp_conn->sub_conn[idx].connection.rmt_port;
590 cookie_echo_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
591 vnet_sctp_set_chunk_type (&cookie_echo_chunk->chunk_hdr, COOKIE_ECHO);
592 vnet_sctp_set_chunk_length (&cookie_echo_chunk->chunk_hdr, chunk_len);
593 clib_memcpy (&(cookie_echo_chunk->cookie), sc,
594 sizeof (sctp_state_cookie_param_t));
596 /* Measure RTT with this */
597 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
599 vnet_buffer (b)->sctp.connection_index =
600 sctp_conn->sub_conn[idx].connection.c_index;
604 * Convert buffer to INIT-ACK
607 sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
608 ip4_address_t * ip4_addr,
609 ip6_address_t * ip6_addr)
611 vlib_main_t *vm = vlib_get_main ();
612 sctp_ipv4_addr_param_t *ip4_param = 0;
613 sctp_ipv6_addr_param_t *ip6_param = 0;
614 u8 idx = sctp_pick_conn_idx_on_chunk (INIT_ACK);
615 u32 random_seed = random_default_seed ();
617 sctp_reuse_buffer (vm, b);
619 /* The minimum size of the message is given by the sctp_init_ack_chunk_t */
621 sizeof (sctp_init_ack_chunk_t) + sizeof (sctp_state_cookie_param_t);
623 if (PREDICT_TRUE (ip4_addr != NULL))
625 /* Create room for variable-length fields in the INIT_ACK chunk */
626 alloc_bytes += SCTP_IPV4_ADDRESS_TYPE_LENGTH;
628 if (PREDICT_TRUE (ip6_addr != NULL))
630 /* Create room for variable-length fields in the INIT_ACK chunk */
631 alloc_bytes += SCTP_IPV6_ADDRESS_TYPE_LENGTH;
634 if (sctp_conn->sub_conn[idx].connection.is_ip4)
635 alloc_bytes += sizeof (sctp_ipv4_addr_param_t);
637 alloc_bytes += sizeof (sctp_ipv6_addr_param_t);
639 /* As per RFC 4960 the chunk_length value does NOT contemplate
640 * the size of the first header (see sctp_header_t) and any padding
642 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
644 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
646 sctp_init_ack_chunk_t *init_ack_chunk =
647 vlib_buffer_push_uninit (b, alloc_bytes);
649 u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
651 /* Create State Cookie parameter */
652 sctp_state_cookie_param_t *state_cookie_param =
653 (sctp_state_cookie_param_t *) ((char *) init_ack_chunk + pointer_offset);
655 state_cookie_param->param_hdr.type =
656 clib_host_to_net_u16 (SCTP_STATE_COOKIE_TYPE);
657 state_cookie_param->param_hdr.length =
658 clib_host_to_net_u16 (sizeof (sctp_state_cookie_param_t));
659 state_cookie_param->creation_time = clib_host_to_net_u32 (sctp_time_now ());
660 state_cookie_param->cookie_lifespan =
661 clib_host_to_net_u32 (SCTP_VALID_COOKIE_LIFE);
663 sctp_compute_mac (sctp_conn, state_cookie_param);
665 pointer_offset += sizeof (sctp_state_cookie_param_t);
667 if (PREDICT_TRUE (ip4_addr != NULL))
669 sctp_ipv4_addr_param_t *ipv4_addr =
670 (sctp_ipv4_addr_param_t *) init_ack_chunk + pointer_offset;
672 ipv4_addr->param_hdr.type =
673 clib_host_to_net_u16 (SCTP_IPV4_ADDRESS_TYPE);
674 ipv4_addr->param_hdr.length =
675 clib_host_to_net_u16 (SCTP_IPV4_ADDRESS_TYPE_LENGTH);
676 ipv4_addr->address.as_u32 = ip4_addr->as_u32;
678 pointer_offset += SCTP_IPV4_ADDRESS_TYPE_LENGTH;
680 if (PREDICT_TRUE (ip6_addr != NULL))
682 sctp_ipv6_addr_param_t *ipv6_addr =
683 (sctp_ipv6_addr_param_t *) init_ack_chunk +
684 sizeof (sctp_init_chunk_t) + pointer_offset;
686 ipv6_addr->param_hdr.type =
687 clib_host_to_net_u16 (SCTP_IPV6_ADDRESS_TYPE);
688 ipv6_addr->param_hdr.length =
689 clib_host_to_net_u16 (SCTP_IPV6_ADDRESS_TYPE_LENGTH);
690 ipv6_addr->address.as_u64[0] = ip6_addr->as_u64[0];
691 ipv6_addr->address.as_u64[1] = ip6_addr->as_u64[1];
693 pointer_offset += SCTP_IPV6_ADDRESS_TYPE_LENGTH;
696 if (sctp_conn->sub_conn[idx].connection.is_ip4)
698 ip4_param = (sctp_ipv4_addr_param_t *) init_ack_chunk + pointer_offset;
699 ip4_param->address.as_u32 =
700 sctp_conn->sub_conn[idx].connection.lcl_ip.ip4.as_u32;
702 pointer_offset += sizeof (sctp_ipv4_addr_param_t);
706 ip6_param = (sctp_ipv6_addr_param_t *) init_ack_chunk + pointer_offset;
707 ip6_param->address.as_u64[0] =
708 sctp_conn->sub_conn[idx].connection.lcl_ip.ip6.as_u64[0];
709 ip6_param->address.as_u64[1] =
710 sctp_conn->sub_conn[idx].connection.lcl_ip.ip6.as_u64[1];
712 pointer_offset += sizeof (sctp_ipv6_addr_param_t);
715 /* src_port & dst_port are already in network byte-order */
716 init_ack_chunk->sctp_hdr.checksum = 0;
717 init_ack_chunk->sctp_hdr.src_port =
718 sctp_conn->sub_conn[idx].connection.lcl_port;
719 init_ack_chunk->sctp_hdr.dst_port =
720 sctp_conn->sub_conn[idx].connection.rmt_port;
721 /* the sctp_conn->verification_tag is already in network byte-order (being a copy of the init_tag coming with the INIT chunk) */
722 init_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
723 init_ack_chunk->initial_tsn =
724 clib_host_to_net_u32 (sctp_conn->local_initial_tsn);
725 SCTP_CONN_TRACKING_DBG ("init_ack_chunk->initial_tsn = %u",
726 init_ack_chunk->initial_tsn);
728 vnet_sctp_set_chunk_type (&init_ack_chunk->chunk_hdr, INIT_ACK);
729 vnet_sctp_set_chunk_length (&init_ack_chunk->chunk_hdr, chunk_len);
731 init_ack_chunk->initiate_tag =
732 clib_host_to_net_u32 (random_u32 (&random_seed));
734 init_ack_chunk->a_rwnd = clib_host_to_net_u32 (DEFAULT_A_RWND);
735 init_ack_chunk->inboud_streams_count =
736 clib_host_to_net_u16 (INBOUND_STREAMS_COUNT);
737 init_ack_chunk->outbound_streams_count =
738 clib_host_to_net_u16 (OUTBOUND_STREAMS_COUNT);
740 sctp_conn->local_tag = init_ack_chunk->initiate_tag;
742 /* Measure RTT with this */
743 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
745 vnet_buffer (b)->sctp.connection_index =
746 sctp_conn->sub_conn[idx].connection.c_index;
750 * Convert buffer to SHUTDOWN
753 sctp_prepare_shutdown_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
755 vlib_main_t *vm = vlib_get_main ();
756 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN);
757 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
759 b = sctp_reuse_buffer (vm, b);
761 /* As per RFC 4960 the chunk_length value does NOT contemplate
762 * the size of the first header (see sctp_header_t) and any padding
764 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
766 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
768 sctp_shutdown_association_chunk_t *shutdown_chunk =
769 vlib_buffer_push_uninit (b, alloc_bytes);
771 shutdown_chunk->sctp_hdr.checksum = 0;
772 /* No need of host_to_net conversion, already in net-byte order */
773 shutdown_chunk->sctp_hdr.src_port =
774 sctp_conn->sub_conn[idx].connection.lcl_port;
775 shutdown_chunk->sctp_hdr.dst_port =
776 sctp_conn->sub_conn[idx].connection.rmt_port;
777 shutdown_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
778 vnet_sctp_set_chunk_type (&shutdown_chunk->chunk_hdr, SHUTDOWN);
779 vnet_sctp_set_chunk_length (&shutdown_chunk->chunk_hdr, chunk_len);
781 shutdown_chunk->cumulative_tsn_ack = sctp_conn->last_rcvd_tsn;
783 vnet_buffer (b)->sctp.connection_index =
784 sctp_conn->sub_conn[idx].connection.c_index;
791 sctp_send_shutdown (sctp_connection_t * sctp_conn)
795 sctp_main_t *tm = vnet_get_sctp_main ();
796 vlib_main_t *vm = vlib_get_main ();
798 if (sctp_check_outstanding_data_chunks (sctp_conn) > 0)
801 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
804 b = vlib_get_buffer (vm, bi);
805 sctp_init_buffer (vm, b);
806 sctp_prepare_shutdown_chunk (sctp_conn, b);
808 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN);
809 sctp_enqueue_to_output (vm, b, bi,
810 sctp_conn->sub_conn[idx].connection.is_ip4);
812 /* Measure RTT with this */
813 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
817 * Convert buffer to SHUTDOWN_ACK
820 sctp_prepare_shutdown_ack_chunk (sctp_connection_t * sctp_conn,
823 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_ACK);
824 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
825 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
827 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
829 sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
830 vlib_buffer_push_uninit (b, alloc_bytes);
832 shutdown_ack_chunk->sctp_hdr.checksum = 0;
833 /* No need of host_to_net conversion, already in net-byte order */
834 shutdown_ack_chunk->sctp_hdr.src_port =
835 sctp_conn->sub_conn[idx].connection.lcl_port;
836 shutdown_ack_chunk->sctp_hdr.dst_port =
837 sctp_conn->sub_conn[idx].connection.rmt_port;
838 shutdown_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
840 vnet_sctp_set_chunk_type (&shutdown_ack_chunk->chunk_hdr, SHUTDOWN_ACK);
841 vnet_sctp_set_chunk_length (&shutdown_ack_chunk->chunk_hdr, chunk_len);
843 vnet_buffer (b)->sctp.connection_index =
844 sctp_conn->sub_conn[idx].connection.c_index;
851 sctp_send_shutdown_ack (sctp_connection_t * sctp_conn)
855 sctp_main_t *tm = vnet_get_sctp_main ();
856 vlib_main_t *vm = vlib_get_main ();
858 if (sctp_check_outstanding_data_chunks (sctp_conn) > 0)
861 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
864 b = vlib_get_buffer (vm, bi);
865 sctp_init_buffer (vm, b);
866 sctp_prepare_shutdown_ack_chunk (sctp_conn, b);
868 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_ACK);
869 sctp_enqueue_to_output (vm, b, bi,
870 sctp_conn->sub_conn[idx].connection.is_ip4);
872 /* Measure RTT with this */
873 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
875 /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
876 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
877 sctp_conn->sub_conn[idx].RTO);
878 sctp_conn->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
882 * Convert buffer to SACK
885 sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
887 vlib_main_t *vm = vlib_get_main ();
888 u8 idx = sctp_pick_conn_idx_on_chunk (SACK);
890 sctp_reuse_buffer (vm, b);
892 u16 alloc_bytes = sizeof (sctp_selective_ack_chunk_t);
894 /* As per RFC 4960 the chunk_length value does NOT contemplate
895 * the size of the first header (see sctp_header_t) and any padding
897 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
899 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
901 sctp_selective_ack_chunk_t *sack = vlib_buffer_push_uninit (b, alloc_bytes);
903 sack->sctp_hdr.checksum = 0;
904 sack->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
905 sack->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
906 sack->sctp_hdr.verification_tag = sctp_conn->remote_tag;
907 vnet_sctp_set_chunk_type (&sack->chunk_hdr, SACK);
908 vnet_sctp_set_chunk_length (&sack->chunk_hdr, chunk_len);
910 sack->cumulative_tsn_ack = sctp_conn->next_tsn_expected;
912 sctp_conn->ack_state = 0;
914 vnet_buffer (b)->sctp.connection_index =
915 sctp_conn->sub_conn[idx].connection.c_index;
919 * Convert buffer to HEARTBEAT_ACK
922 sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn,
925 vlib_main_t *vm = vlib_get_main ();
927 u8 idx = sctp_pick_conn_idx_on_chunk (HEARTBEAT_ACK);
928 u16 alloc_bytes = sizeof (sctp_hb_ack_chunk_t);
930 sctp_reuse_buffer (vm, b);
932 /* As per RFC 4960 the chunk_length value does NOT contemplate
933 * the size of the first header (see sctp_header_t) and any padding
935 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
937 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
939 sctp_hb_ack_chunk_t *hb_ack = vlib_buffer_push_uninit (b, alloc_bytes);
941 hb_ack->sctp_hdr.checksum = 0;
942 /* No need of host_to_net conversion, already in net-byte order */
943 hb_ack->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
944 hb_ack->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
945 hb_ack->sctp_hdr.verification_tag = sctp_conn->remote_tag;
946 hb_ack->hb_info.param_hdr.type = clib_host_to_net_u16 (1);
947 hb_ack->hb_info.param_hdr.length =
948 clib_host_to_net_u16 (sizeof (hb_ack->hb_info.hb_info));
950 vnet_sctp_set_chunk_type (&hb_ack->chunk_hdr, HEARTBEAT_ACK);
951 vnet_sctp_set_chunk_length (&hb_ack->chunk_hdr, chunk_len);
953 vnet_buffer (b)->sctp.connection_index =
954 sctp_conn->sub_conn[idx].connection.c_index;
958 * Convert buffer to HEARTBEAT
961 sctp_prepare_heartbeat_chunk (sctp_connection_t * sctp_conn,
964 u8 idx = sctp_pick_conn_idx_on_chunk (HEARTBEAT);
965 u16 alloc_bytes = sizeof (sctp_hb_req_chunk_t);
967 /* As per RFC 4960 the chunk_length value does NOT contemplate
968 * the size of the first header (see sctp_header_t) and any padding
970 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
972 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
974 sctp_hb_req_chunk_t *hb_req = vlib_buffer_push_uninit (b, alloc_bytes);
976 hb_req->sctp_hdr.checksum = 0;
977 /* No need of host_to_net conversion, already in net-byte order */
978 hb_req->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
979 hb_req->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
980 hb_req->sctp_hdr.verification_tag = sctp_conn->remote_tag;
981 hb_req->hb_info.param_hdr.type = clib_host_to_net_u16 (1);
982 hb_req->hb_info.param_hdr.length =
983 clib_host_to_net_u16 (sizeof (hb_req->hb_info.hb_info));
985 vnet_sctp_set_chunk_type (&hb_req->chunk_hdr, HEARTBEAT);
986 vnet_sctp_set_chunk_length (&hb_req->chunk_hdr, chunk_len);
988 vnet_buffer (b)->sctp.connection_index =
989 sctp_conn->sub_conn[idx].connection.c_index;
993 sctp_send_heartbeat (sctp_connection_t * sctp_conn)
997 sctp_main_t *tm = vnet_get_sctp_main ();
998 vlib_main_t *vm = vlib_get_main ();
1000 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
1003 b = vlib_get_buffer (vm, bi);
1004 sctp_init_buffer (vm, b);
1005 sctp_prepare_heartbeat_chunk (sctp_conn, b);
1007 u8 idx = sctp_pick_conn_idx_on_state (SCTP_STATE_ESTABLISHED);
1008 sctp_enqueue_to_output_now (vm, b, bi,
1009 sctp_conn->sub_conn[idx].connection.is_ip4);
1011 sctp_conn->sub_conn[idx].unacknowledged_hb += 1;
1015 * Convert buffer to SHUTDOWN_COMPLETE
1018 sctp_prepare_shutdown_complete_chunk (sctp_connection_t * sctp_conn,
1021 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_COMPLETE);
1022 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
1023 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
1025 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
1027 sctp_shutdown_complete_chunk_t *shutdown_complete =
1028 vlib_buffer_push_uninit (b, alloc_bytes);
1030 shutdown_complete->sctp_hdr.checksum = 0;
1031 /* No need of host_to_net conversion, already in net-byte order */
1032 shutdown_complete->sctp_hdr.src_port =
1033 sctp_conn->sub_conn[idx].connection.lcl_port;
1034 shutdown_complete->sctp_hdr.dst_port =
1035 sctp_conn->sub_conn[idx].connection.rmt_port;
1036 shutdown_complete->sctp_hdr.verification_tag = sctp_conn->remote_tag;
1038 vnet_sctp_set_chunk_type (&shutdown_complete->chunk_hdr, SHUTDOWN_COMPLETE);
1039 vnet_sctp_set_chunk_length (&shutdown_complete->chunk_hdr, chunk_len);
1041 vnet_buffer (b)->sctp.connection_index =
1042 sctp_conn->sub_conn[idx].connection.c_index;
1046 sctp_send_shutdown_complete (sctp_connection_t * sctp_conn)
1050 sctp_main_t *tm = vnet_get_sctp_main ();
1051 vlib_main_t *vm = vlib_get_main ();
1053 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
1056 b = vlib_get_buffer (vm, bi);
1057 sctp_init_buffer (vm, b);
1058 sctp_prepare_shutdown_complete_chunk (sctp_conn, b);
1060 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_COMPLETE);
1061 sctp_enqueue_to_output (vm, b, bi,
1062 sctp_conn->sub_conn[idx].connection.is_ip4);
1064 sctp_conn->state = SCTP_STATE_CLOSED;
1072 sctp_send_init (sctp_connection_t * sctp_conn)
1076 sctp_main_t *tm = vnet_get_sctp_main ();
1077 vlib_main_t *vm = vlib_get_main ();
1079 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
1082 b = vlib_get_buffer (vm, bi);
1083 u8 idx = sctp_pick_conn_idx_on_chunk (INIT);
1085 sctp_init_buffer (vm, b);
1086 sctp_prepare_init_chunk (sctp_conn, b);
1088 sctp_push_ip_hdr (tm, &sctp_conn->sub_conn[idx], b);
1089 sctp_enqueue_to_ip_lookup (vm, b, bi, sctp_conn->sub_conn[idx].c_is_ip4);
1091 /* Measure RTT with this */
1092 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
1094 /* Start the T1_INIT timer */
1095 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T1_INIT,
1096 sctp_conn->sub_conn[idx].RTO);
1098 /* Change state to COOKIE_WAIT */
1099 sctp_conn->state = SCTP_STATE_COOKIE_WAIT;
1103 * Push SCTP header and update connection variables
1106 sctp_push_hdr_i (sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b,
1107 sctp_state_t next_state)
1110 b->current_length + b->total_length_not_including_first_buffer;
1111 ASSERT (!b->total_length_not_including_first_buffer
1112 || (b->flags & VLIB_BUFFER_NEXT_PRESENT));
1114 SCTP_ADV_DBG_OUTPUT ("b->current_length = %u, "
1115 "b->current_data = %p "
1117 b->current_length, b->current_data, data_len);
1119 u16 bytes_to_add = sizeof (sctp_payload_data_chunk_t);
1120 u16 chunk_length = data_len + bytes_to_add - sizeof (sctp_header_t);
1122 bytes_to_add += vnet_sctp_calculate_padding (bytes_to_add + data_len);
1124 sctp_payload_data_chunk_t *data_chunk =
1125 vlib_buffer_push_uninit (b, bytes_to_add);
1127 data_chunk->sctp_hdr.checksum = 0;
1128 data_chunk->sctp_hdr.src_port =
1129 sctp_conn->sub_conn[idx].connection.lcl_port;
1130 data_chunk->sctp_hdr.dst_port =
1131 sctp_conn->sub_conn[idx].connection.rmt_port;
1132 data_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
1134 data_chunk->tsn = clib_host_to_net_u32 (sctp_conn->next_tsn);
1135 data_chunk->stream_id = clib_host_to_net_u16 (0);
1136 data_chunk->stream_seq = clib_host_to_net_u16 (0);
1138 vnet_sctp_set_chunk_type (&data_chunk->chunk_hdr, DATA);
1139 vnet_sctp_set_chunk_length (&data_chunk->chunk_hdr, chunk_length);
1141 vnet_sctp_set_bbit (&data_chunk->chunk_hdr);
1142 vnet_sctp_set_ebit (&data_chunk->chunk_hdr);
1144 SCTP_ADV_DBG_OUTPUT ("POINTER_WITH_DATA = %p, DATA_OFFSET = %u",
1145 b->data, b->current_data);
1147 sctp_conn->next_tsn += data_len;
1149 vnet_buffer (b)->sctp.connection_index =
1150 sctp_conn->sub_conn[idx].connection.c_index;
1154 sctp_push_header (transport_connection_t * trans_conn, vlib_buffer_t * b)
1156 sctp_connection_t *sctp_conn =
1157 sctp_get_connection_from_transport (trans_conn);
1159 u8 idx = sctp_pick_conn_idx_on_chunk (DATA);
1161 if (sctp_conn->sub_conn[idx].unacknowledged_hb >
1162 SCTP_ASSOCIATION_MAX_RETRANS)
1164 // The remote-peer is considered to be unreachable hence shutting down
1166 /* Start cleanup. App wasn't notified yet so use delete notify as
1167 * opposed to delete to cleanup session layer state. */
1168 stream_session_delete_notify (&sctp_conn->sub_conn
1169 [MAIN_SCTP_SUB_CONN_IDX].connection);
1171 sctp_connection_timers_reset (sctp_conn);
1173 sctp_connection_cleanup (sctp_conn);
1176 sctp_push_hdr_i (sctp_conn, idx, b, SCTP_STATE_ESTABLISHED);
1178 if (sctp_conn->sub_conn[idx].RTO_pending == 0)
1180 sctp_conn->sub_conn[idx].RTO_pending = 1;
1181 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
1184 sctp_trajectory_add_start (b0, 3);
1191 sctp46_output_inline (vlib_main_t * vm,
1192 vlib_node_runtime_t * node,
1193 vlib_frame_t * from_frame, int is_ip4)
1195 u32 n_left_from, next_index, *from, *to_next;
1196 u32 my_thread_index = vm->thread_index;
1198 from = vlib_frame_vector_args (from_frame);
1199 n_left_from = from_frame->n_vectors;
1200 next_index = node->cached_next_index;
1201 sctp_set_time_now (my_thread_index);
1203 while (n_left_from > 0)
1207 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1209 while (n_left_from > 0 && n_left_to_next > 0)
1213 sctp_header_t *sctp_hdr = 0;
1214 sctp_connection_t *sctp_conn;
1215 sctp_tx_trace_t *t0;
1216 sctp_header_t *th0 = 0;
1217 u32 error0 = SCTP_ERROR_PKTS_SENT, next0 =
1218 SCTP_OUTPUT_NEXT_IP_LOOKUP;
1220 #if SCTP_DEBUG_STATE_MACHINE
1221 u16 packet_length = 0;
1229 n_left_to_next -= 1;
1231 b0 = vlib_get_buffer (vm, bi0);
1233 sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1236 if (PREDICT_FALSE (sctp_conn == 0))
1238 error0 = SCTP_ERROR_INVALID_CONNECTION;
1239 next0 = SCTP_OUTPUT_NEXT_DROP;
1243 u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
1245 th0 = vlib_buffer_get_current (b0);
1249 ip4_header_t *iph4 = vlib_buffer_push_ip4 (vm,
1251 &sctp_conn->sub_conn
1258 IP_PROTOCOL_SCTP, 1);
1260 u32 checksum = ip4_sctp_compute_checksum (vm, b0, iph4);
1262 sctp_hdr = ip4_next_header (iph4);
1263 sctp_hdr->checksum = checksum;
1265 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1267 #if SCTP_DEBUG_STATE_MACHINE
1268 packet_length = clib_net_to_host_u16 (iph4->length);
1273 ip6_header_t *iph6 = vlib_buffer_push_ip6 (vm,
1275 &sctp_conn->sub_conn
1279 &sctp_conn->sub_conn
1286 u32 checksum = ip6_sctp_compute_checksum (vm, b0, iph6, &bogus);
1289 sctp_hdr = ip6_next_header (iph6);
1290 sctp_hdr->checksum = checksum;
1292 vnet_buffer (b0)->l3_hdr_offset = (u8 *) iph6 - b0->data;
1293 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1295 #if SCTP_DEBUG_STATE_MACHINE
1296 packet_length = clib_net_to_host_u16 (iph6->payload_length);
1301 (sctp_conn->sub_conn[idx].connection.lcl_port ==
1303 || sctp_conn->sub_conn[idx].connection.lcl_port ==
1305 && (sctp_conn->sub_conn[idx].connection.rmt_port ==
1307 || sctp_conn->sub_conn[idx].connection.rmt_port ==
1308 sctp_hdr->src_port);
1310 sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1311 u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1315 SCTP_DBG_STATE_MACHINE ("BUFFER IS INCORRECT: conn_index = %u, "
1316 "packet_length = %u, "
1317 "chunk_type = %u [%s], "
1318 "connection.lcl_port = %u, sctp_hdr->src_port = %u, "
1319 "connection.rmt_port = %u, sctp_hdr->dst_port = %u",
1321 [idx].connection.c_index, packet_length,
1323 sctp_chunk_to_string (chunk_type),
1324 sctp_conn->sub_conn[idx].
1325 connection.lcl_port, sctp_hdr->src_port,
1326 sctp_conn->sub_conn[idx].
1327 connection.rmt_port,
1328 sctp_hdr->dst_port);
1330 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1331 next0 = SCTP_OUTPUT_NEXT_DROP;
1335 SCTP_DBG_STATE_MACHINE
1336 ("CONN_INDEX = %u, CURR_CONN_STATE = %u (%s), "
1337 "CHUNK_TYPE = %s, " "SRC_PORT = %u, DST_PORT = %u",
1338 sctp_conn->sub_conn[idx].connection.c_index,
1339 sctp_conn->state, sctp_state_to_string (sctp_conn->state),
1340 sctp_chunk_to_string (chunk_type), full_hdr->hdr.src_port,
1341 full_hdr->hdr.dst_port);
1343 if (chunk_type == DATA)
1344 SCTP_ADV_DBG_OUTPUT ("PACKET_LENGTH = %u", packet_length);
1346 /* Let's make sure the state-machine does not send anything crazy */
1347 switch (sctp_conn->state)
1349 case SCTP_STATE_CLOSED:
1351 if (chunk_type != INIT && chunk_type != INIT_ACK)
1353 SCTP_DBG_STATE_MACHINE
1354 ("Sending the wrong chunk (%s) based on state-machine status (%s)",
1355 sctp_chunk_to_string (chunk_type),
1356 sctp_state_to_string (sctp_conn->state));
1358 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1359 next0 = SCTP_OUTPUT_NEXT_DROP;
1364 case SCTP_STATE_ESTABLISHED:
1365 if (chunk_type != DATA && chunk_type != HEARTBEAT &&
1366 chunk_type != HEARTBEAT_ACK && chunk_type != SACK &&
1367 chunk_type != COOKIE_ACK && chunk_type != SHUTDOWN)
1369 SCTP_DBG_STATE_MACHINE
1370 ("Sending the wrong chunk (%s) based on state-machine status (%s)",
1371 sctp_chunk_to_string (chunk_type),
1372 sctp_state_to_string (sctp_conn->state));
1374 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1375 next0 = SCTP_OUTPUT_NEXT_DROP;
1379 case SCTP_STATE_COOKIE_WAIT:
1380 if (chunk_type != COOKIE_ECHO)
1382 SCTP_DBG_STATE_MACHINE
1383 ("Sending the wrong chunk (%s) based on state-machine status (%s)",
1384 sctp_chunk_to_string (chunk_type),
1385 sctp_state_to_string (sctp_conn->state));
1387 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1388 next0 = SCTP_OUTPUT_NEXT_DROP;
1392 sctp_conn->state = SCTP_STATE_COOKIE_ECHOED;
1395 SCTP_DBG_STATE_MACHINE
1396 ("Sending chunk (%s) based on state-machine status (%s)",
1397 sctp_chunk_to_string (chunk_type),
1398 sctp_state_to_string (sctp_conn->state));
1402 if (chunk_type == SHUTDOWN)
1404 /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
1405 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
1406 sctp_conn->sub_conn[idx].RTO);
1407 sctp_conn->state = SCTP_STATE_SHUTDOWN_SENT;
1410 if (chunk_type == DATA)
1412 sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1413 sctp_conn->sub_conn[idx].RTO);
1416 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1417 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1419 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1421 SCTP_DBG_STATE_MACHINE ("CONNECTION_INDEX = %u, "
1424 sctp_conn->sub_conn[idx].connection.c_index,
1425 sctp_state_to_string (sctp_conn->state),
1426 sctp_chunk_to_string (chunk_type));
1428 vnet_sctp_common_hdr_params_host_to_net (&full_hdr->common_hdr);
1431 b0->error = node->errors[error0];
1432 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1434 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1437 clib_memcpy (&t0->sctp_header, th0,
1438 sizeof (t0->sctp_header));
1442 memset (&t0->sctp_header, 0, sizeof (t0->sctp_header));
1444 clib_memcpy (&t0->sctp_connection, sctp_conn,
1445 sizeof (t0->sctp_connection));
1448 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1449 n_left_to_next, bi0, next0);
1452 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1455 return from_frame->n_vectors;
1459 sctp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1460 vlib_frame_t * from_frame)
1462 return sctp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1466 sctp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1467 vlib_frame_t * from_frame)
1469 return sctp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1473 VLIB_REGISTER_NODE (sctp4_output_node) =
1475 .function = sctp4_output,.name = "sctp4-output",
1476 /* Takes a vector of packets. */
1477 .vector_size = sizeof (u32),
1478 .n_errors = SCTP_N_ERROR,
1479 .error_strings = sctp_error_strings,
1480 .n_next_nodes = SCTP_OUTPUT_N_NEXT,
1482 #define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
1483 foreach_sctp4_output_next
1486 .format_buffer = format_sctp_header,
1487 .format_trace = format_sctp_tx_trace,
1491 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_output_node, sctp4_output);
1494 VLIB_REGISTER_NODE (sctp6_output_node) =
1496 .function = sctp6_output,
1497 .name = "sctp6-output",
1498 /* Takes a vector of packets. */
1499 .vector_size = sizeof (u32),
1500 .n_errors = SCTP_N_ERROR,
1501 .error_strings = sctp_error_strings,
1502 .n_next_nodes = SCTP_OUTPUT_N_NEXT,
1504 #define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
1505 foreach_sctp6_output_next
1508 .format_buffer = format_sctp_header,
1509 .format_trace = format_sctp_tx_trace,
1513 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_output_node, sctp6_output);
1516 * fd.io coding-style-patch-verification: ON
1519 * eval: (c-set-style "gnu")