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_NON_DEFAULT_FREELIST;
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
507 unsigned int len = 0;
508 const EVP_MD *md = EVP_sha1 ();
509 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
510 ctx = HMAC_CTX_new ();
511 HMAC_Init_ex (ctx, &state_cookie->creation_time,
512 sizeof (state_cookie->creation_time), md, NULL);
513 HMAC_Update (ctx, (const unsigned char *) &sctp_conn, sizeof (sctp_conn));
514 HMAC_Final (ctx, state_cookie->mac, &len);
516 HMAC_CTX_init (&ctx);
517 HMAC_Init_ex (&ctx, &state_cookie->creation_time,
518 sizeof (state_cookie->creation_time), md, NULL);
519 HMAC_Update (&ctx, (const unsigned char *) &sctp_conn, sizeof (sctp_conn));
520 HMAC_Final (&ctx, state_cookie->mac, &len);
521 HMAC_CTX_cleanup (&ctx);
524 ENDIANESS_SWAP (state_cookie->mac);
528 sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn,
531 vlib_main_t *vm = vlib_get_main ();
532 u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ACK);
534 sctp_reuse_buffer (vm, b);
536 u16 alloc_bytes = sizeof (sctp_cookie_ack_chunk_t);
538 /* As per RFC 4960 the chunk_length value does NOT contemplate
539 * the size of the first header (see sctp_header_t) and any padding
541 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
543 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
545 sctp_cookie_ack_chunk_t *cookie_ack_chunk =
546 vlib_buffer_push_uninit (b, alloc_bytes);
548 cookie_ack_chunk->sctp_hdr.checksum = 0;
549 cookie_ack_chunk->sctp_hdr.src_port =
550 sctp_conn->sub_conn[idx].connection.lcl_port;
551 cookie_ack_chunk->sctp_hdr.dst_port =
552 sctp_conn->sub_conn[idx].connection.rmt_port;
553 cookie_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
554 vnet_sctp_set_chunk_type (&cookie_ack_chunk->chunk_hdr, COOKIE_ACK);
555 vnet_sctp_set_chunk_length (&cookie_ack_chunk->chunk_hdr, chunk_len);
557 vnet_buffer (b)->sctp.connection_index =
558 sctp_conn->sub_conn[idx].connection.c_index;
562 sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn,
564 sctp_state_cookie_param_t * sc)
566 vlib_main_t *vm = vlib_get_main ();
567 u8 idx = sctp_pick_conn_idx_on_chunk (COOKIE_ECHO);
569 sctp_reuse_buffer (vm, b);
571 /* The minimum size of the message is given by the sctp_init_ack_chunk_t */
572 u16 alloc_bytes = sizeof (sctp_cookie_echo_chunk_t);
573 /* As per RFC 4960 the chunk_length value does NOT contemplate
574 * the size of the first header (see sctp_header_t) and any padding
576 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
577 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
578 sctp_cookie_echo_chunk_t *cookie_echo_chunk =
579 vlib_buffer_push_uninit (b, alloc_bytes);
580 cookie_echo_chunk->sctp_hdr.checksum = 0;
581 cookie_echo_chunk->sctp_hdr.src_port =
582 sctp_conn->sub_conn[idx].connection.lcl_port;
583 cookie_echo_chunk->sctp_hdr.dst_port =
584 sctp_conn->sub_conn[idx].connection.rmt_port;
585 cookie_echo_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
586 vnet_sctp_set_chunk_type (&cookie_echo_chunk->chunk_hdr, COOKIE_ECHO);
587 vnet_sctp_set_chunk_length (&cookie_echo_chunk->chunk_hdr, chunk_len);
588 clib_memcpy (&(cookie_echo_chunk->cookie), sc,
589 sizeof (sctp_state_cookie_param_t));
591 vnet_buffer (b)->sctp.connection_index =
592 sctp_conn->sub_conn[idx].connection.c_index;
596 * Convert buffer to INIT-ACK
599 sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b,
600 ip4_address_t * ip4_addr,
601 ip6_address_t * ip6_addr)
603 vlib_main_t *vm = vlib_get_main ();
604 sctp_ipv4_addr_param_t *ip4_param = 0;
605 sctp_ipv6_addr_param_t *ip6_param = 0;
606 u8 idx = sctp_pick_conn_idx_on_chunk (INIT_ACK);
607 u32 random_seed = random_default_seed ();
609 sctp_reuse_buffer (vm, b);
611 /* The minimum size of the message is given by the sctp_init_ack_chunk_t */
613 sizeof (sctp_init_ack_chunk_t) + sizeof (sctp_state_cookie_param_t);
615 if (PREDICT_TRUE (ip4_addr != NULL))
617 /* Create room for variable-length fields in the INIT_ACK chunk */
618 alloc_bytes += SCTP_IPV4_ADDRESS_TYPE_LENGTH;
620 if (PREDICT_TRUE (ip6_addr != NULL))
622 /* Create room for variable-length fields in the INIT_ACK chunk */
623 alloc_bytes += SCTP_IPV6_ADDRESS_TYPE_LENGTH;
626 if (sctp_conn->sub_conn[idx].connection.is_ip4)
627 alloc_bytes += sizeof (sctp_ipv4_addr_param_t);
629 alloc_bytes += sizeof (sctp_ipv6_addr_param_t);
631 /* As per RFC 4960 the chunk_length value does NOT contemplate
632 * the size of the first header (see sctp_header_t) and any padding
634 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
636 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
638 sctp_init_ack_chunk_t *init_ack_chunk =
639 vlib_buffer_push_uninit (b, alloc_bytes);
641 u16 pointer_offset = sizeof (sctp_init_ack_chunk_t);
643 /* Create State Cookie parameter */
644 sctp_state_cookie_param_t *state_cookie_param =
645 (sctp_state_cookie_param_t *) ((char *) init_ack_chunk + pointer_offset);
647 state_cookie_param->param_hdr.type =
648 clib_host_to_net_u16 (SCTP_STATE_COOKIE_TYPE);
649 state_cookie_param->param_hdr.length =
650 clib_host_to_net_u16 (sizeof (sctp_state_cookie_param_t));
651 state_cookie_param->creation_time = clib_host_to_net_u32 (sctp_time_now ());
652 state_cookie_param->cookie_lifespan =
653 clib_host_to_net_u32 (SCTP_VALID_COOKIE_LIFE);
655 sctp_compute_mac (sctp_conn, state_cookie_param);
657 pointer_offset += sizeof (sctp_state_cookie_param_t);
659 if (PREDICT_TRUE (ip4_addr != NULL))
661 sctp_ipv4_addr_param_t *ipv4_addr =
662 (sctp_ipv4_addr_param_t *) init_ack_chunk + pointer_offset;
664 ipv4_addr->param_hdr.type =
665 clib_host_to_net_u16 (SCTP_IPV4_ADDRESS_TYPE);
666 ipv4_addr->param_hdr.length =
667 clib_host_to_net_u16 (SCTP_IPV4_ADDRESS_TYPE_LENGTH);
668 ipv4_addr->address.as_u32 = ip4_addr->as_u32;
670 pointer_offset += SCTP_IPV4_ADDRESS_TYPE_LENGTH;
672 if (PREDICT_TRUE (ip6_addr != NULL))
674 sctp_ipv6_addr_param_t *ipv6_addr =
675 (sctp_ipv6_addr_param_t *) init_ack_chunk + pointer_offset;
677 ipv6_addr->param_hdr.type =
678 clib_host_to_net_u16 (SCTP_IPV6_ADDRESS_TYPE);
679 ipv6_addr->param_hdr.length =
680 clib_host_to_net_u16 (SCTP_IPV6_ADDRESS_TYPE_LENGTH);
681 ipv6_addr->address.as_u64[0] = ip6_addr->as_u64[0];
682 ipv6_addr->address.as_u64[1] = ip6_addr->as_u64[1];
684 pointer_offset += SCTP_IPV6_ADDRESS_TYPE_LENGTH;
687 if (sctp_conn->sub_conn[idx].connection.is_ip4)
689 ip4_param = (sctp_ipv4_addr_param_t *) init_ack_chunk + pointer_offset;
690 ip4_param->address.as_u32 =
691 sctp_conn->sub_conn[idx].connection.lcl_ip.ip4.as_u32;
693 pointer_offset += sizeof (sctp_ipv4_addr_param_t);
697 ip6_param = (sctp_ipv6_addr_param_t *) init_ack_chunk + pointer_offset;
698 ip6_param->address.as_u64[0] =
699 sctp_conn->sub_conn[idx].connection.lcl_ip.ip6.as_u64[0];
700 ip6_param->address.as_u64[1] =
701 sctp_conn->sub_conn[idx].connection.lcl_ip.ip6.as_u64[1];
703 pointer_offset += sizeof (sctp_ipv6_addr_param_t);
706 /* src_port & dst_port are already in network byte-order */
707 init_ack_chunk->sctp_hdr.checksum = 0;
708 init_ack_chunk->sctp_hdr.src_port =
709 sctp_conn->sub_conn[idx].connection.lcl_port;
710 init_ack_chunk->sctp_hdr.dst_port =
711 sctp_conn->sub_conn[idx].connection.rmt_port;
712 /* the sctp_conn->verification_tag is already in network byte-order (being a copy of the init_tag coming with the INIT chunk) */
713 init_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
714 init_ack_chunk->initial_tsn =
715 clib_host_to_net_u32 (sctp_conn->local_initial_tsn);
716 SCTP_CONN_TRACKING_DBG ("init_ack_chunk->initial_tsn = %u",
717 init_ack_chunk->initial_tsn);
719 vnet_sctp_set_chunk_type (&init_ack_chunk->chunk_hdr, INIT_ACK);
720 vnet_sctp_set_chunk_length (&init_ack_chunk->chunk_hdr, chunk_len);
722 init_ack_chunk->initiate_tag =
723 clib_host_to_net_u32 (random_u32 (&random_seed));
725 init_ack_chunk->a_rwnd = clib_host_to_net_u32 (DEFAULT_A_RWND);
726 init_ack_chunk->inboud_streams_count =
727 clib_host_to_net_u16 (INBOUND_STREAMS_COUNT);
728 init_ack_chunk->outbound_streams_count =
729 clib_host_to_net_u16 (OUTBOUND_STREAMS_COUNT);
731 sctp_conn->local_tag = init_ack_chunk->initiate_tag;
733 vnet_buffer (b)->sctp.connection_index =
734 sctp_conn->sub_conn[idx].connection.c_index;
738 * Convert buffer to SHUTDOWN
741 sctp_prepare_shutdown_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
743 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN);
744 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
746 /* As per RFC 4960 the chunk_length value does NOT contemplate
747 * the size of the first header (see sctp_header_t) and any padding
749 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
751 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
753 sctp_shutdown_association_chunk_t *shutdown_chunk =
754 vlib_buffer_push_uninit (b, alloc_bytes);
756 shutdown_chunk->sctp_hdr.checksum = 0;
757 /* No need of host_to_net conversion, already in net-byte order */
758 shutdown_chunk->sctp_hdr.src_port =
759 sctp_conn->sub_conn[idx].connection.lcl_port;
760 shutdown_chunk->sctp_hdr.dst_port =
761 sctp_conn->sub_conn[idx].connection.rmt_port;
762 shutdown_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
763 vnet_sctp_set_chunk_type (&shutdown_chunk->chunk_hdr, SHUTDOWN);
764 vnet_sctp_set_chunk_length (&shutdown_chunk->chunk_hdr, chunk_len);
766 shutdown_chunk->cumulative_tsn_ack = sctp_conn->last_rcvd_tsn;
768 vnet_buffer (b)->sctp.connection_index =
769 sctp_conn->sub_conn[idx].connection.c_index;
776 sctp_send_shutdown (sctp_connection_t * sctp_conn)
780 sctp_main_t *tm = vnet_get_sctp_main ();
781 vlib_main_t *vm = vlib_get_main ();
783 if (sctp_check_outstanding_data_chunks (sctp_conn) > 0)
786 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
789 b = vlib_get_buffer (vm, bi);
790 sctp_init_buffer (vm, b);
791 sctp_prepare_shutdown_chunk (sctp_conn, b);
793 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN);
794 sctp_enqueue_to_output_now (vm, b, bi,
795 sctp_conn->sub_conn[idx].connection.is_ip4);
799 * Convert buffer to SHUTDOWN_ACK
802 sctp_prepare_shutdown_ack_chunk (sctp_connection_t * sctp_conn,
805 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_ACK);
806 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
807 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
809 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
811 sctp_shutdown_ack_chunk_t *shutdown_ack_chunk =
812 vlib_buffer_push_uninit (b, alloc_bytes);
814 shutdown_ack_chunk->sctp_hdr.checksum = 0;
815 /* No need of host_to_net conversion, already in net-byte order */
816 shutdown_ack_chunk->sctp_hdr.src_port =
817 sctp_conn->sub_conn[idx].connection.lcl_port;
818 shutdown_ack_chunk->sctp_hdr.dst_port =
819 sctp_conn->sub_conn[idx].connection.rmt_port;
820 shutdown_ack_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
822 vnet_sctp_set_chunk_type (&shutdown_ack_chunk->chunk_hdr, SHUTDOWN_ACK);
823 vnet_sctp_set_chunk_length (&shutdown_ack_chunk->chunk_hdr, chunk_len);
825 vnet_buffer (b)->sctp.connection_index =
826 sctp_conn->sub_conn[idx].connection.c_index;
833 sctp_send_shutdown_ack (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
835 vlib_main_t *vm = vlib_get_main ();
837 if (sctp_check_outstanding_data_chunks (sctp_conn) > 0)
840 sctp_reuse_buffer (vm, b);
842 sctp_prepare_shutdown_ack_chunk (sctp_conn, b);
846 * Convert buffer to SACK
849 sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, vlib_buffer_t * b)
851 vlib_main_t *vm = vlib_get_main ();
852 u8 idx = sctp_pick_conn_idx_on_chunk (SACK);
854 sctp_reuse_buffer (vm, b);
856 u16 alloc_bytes = sizeof (sctp_selective_ack_chunk_t);
858 /* As per RFC 4960 the chunk_length value does NOT contemplate
859 * the size of the first header (see sctp_header_t) and any padding
861 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
863 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
865 sctp_selective_ack_chunk_t *sack = vlib_buffer_push_uninit (b, alloc_bytes);
867 sack->sctp_hdr.checksum = 0;
868 sack->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
869 sack->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
870 sack->sctp_hdr.verification_tag = sctp_conn->remote_tag;
871 vnet_sctp_set_chunk_type (&sack->chunk_hdr, SACK);
872 vnet_sctp_set_chunk_length (&sack->chunk_hdr, chunk_len);
874 sack->cumulative_tsn_ack = sctp_conn->next_tsn_expected;
876 sctp_conn->ack_state = 0;
878 vnet_buffer (b)->sctp.connection_index =
879 sctp_conn->sub_conn[idx].connection.c_index;
883 * Convert buffer to HEARTBEAT_ACK
886 sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn,
889 vlib_main_t *vm = vlib_get_main ();
891 u8 idx = sctp_pick_conn_idx_on_chunk (HEARTBEAT_ACK);
892 u16 alloc_bytes = sizeof (sctp_hb_ack_chunk_t);
894 sctp_reuse_buffer (vm, b);
896 /* As per RFC 4960 the chunk_length value does NOT contemplate
897 * the size of the first header (see sctp_header_t) and any padding
899 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
901 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
903 sctp_hb_ack_chunk_t *hb_ack = vlib_buffer_push_uninit (b, alloc_bytes);
905 hb_ack->sctp_hdr.checksum = 0;
906 /* No need of host_to_net conversion, already in net-byte order */
907 hb_ack->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
908 hb_ack->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
909 hb_ack->sctp_hdr.verification_tag = sctp_conn->remote_tag;
910 hb_ack->hb_info.param_hdr.type = clib_host_to_net_u16 (1);
911 hb_ack->hb_info.param_hdr.length =
912 clib_host_to_net_u16 (sizeof (hb_ack->hb_info.hb_info));
914 vnet_sctp_set_chunk_type (&hb_ack->chunk_hdr, HEARTBEAT_ACK);
915 vnet_sctp_set_chunk_length (&hb_ack->chunk_hdr, chunk_len);
917 vnet_buffer (b)->sctp.connection_index =
918 sctp_conn->sub_conn[idx].connection.c_index;
922 * Convert buffer to HEARTBEAT
925 sctp_prepare_heartbeat_chunk (sctp_connection_t * sctp_conn,
928 u8 idx = sctp_pick_conn_idx_on_chunk (HEARTBEAT);
929 u16 alloc_bytes = sizeof (sctp_hb_req_chunk_t);
931 /* As per RFC 4960 the chunk_length value does NOT contemplate
932 * the size of the first header (see sctp_header_t) and any padding
934 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
936 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
938 sctp_hb_req_chunk_t *hb_req = vlib_buffer_push_uninit (b, alloc_bytes);
940 hb_req->sctp_hdr.checksum = 0;
941 /* No need of host_to_net conversion, already in net-byte order */
942 hb_req->sctp_hdr.src_port = sctp_conn->sub_conn[idx].connection.lcl_port;
943 hb_req->sctp_hdr.dst_port = sctp_conn->sub_conn[idx].connection.rmt_port;
944 hb_req->sctp_hdr.verification_tag = sctp_conn->remote_tag;
945 hb_req->hb_info.param_hdr.type = clib_host_to_net_u16 (1);
946 hb_req->hb_info.param_hdr.length =
947 clib_host_to_net_u16 (sizeof (hb_req->hb_info.hb_info));
949 vnet_sctp_set_chunk_type (&hb_req->chunk_hdr, HEARTBEAT);
950 vnet_sctp_set_chunk_length (&hb_req->chunk_hdr, chunk_len);
952 vnet_buffer (b)->sctp.connection_index =
953 sctp_conn->sub_conn[idx].connection.c_index;
957 sctp_send_heartbeat (sctp_connection_t * sctp_conn)
961 sctp_main_t *tm = vnet_get_sctp_main ();
962 vlib_main_t *vm = vlib_get_main ();
964 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
967 b = vlib_get_buffer (vm, bi);
968 sctp_init_buffer (vm, b);
969 sctp_prepare_heartbeat_chunk (sctp_conn, b);
971 u8 idx = sctp_pick_conn_idx_on_state (SCTP_STATE_ESTABLISHED);
972 sctp_enqueue_to_output_now (vm, b, bi,
973 sctp_conn->sub_conn[idx].connection.is_ip4);
975 sctp_conn->sub_conn[idx].unacknowledged_hb += 1;
979 * Convert buffer to SHUTDOWN_COMPLETE
982 sctp_prepare_shutdown_complete_chunk (sctp_connection_t * sctp_conn,
985 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_COMPLETE);
986 u16 alloc_bytes = sizeof (sctp_shutdown_association_chunk_t);
987 alloc_bytes += vnet_sctp_calculate_padding (alloc_bytes);
989 u16 chunk_len = alloc_bytes - sizeof (sctp_header_t);
991 sctp_shutdown_complete_chunk_t *shutdown_complete =
992 vlib_buffer_push_uninit (b, alloc_bytes);
994 shutdown_complete->sctp_hdr.checksum = 0;
995 /* No need of host_to_net conversion, already in net-byte order */
996 shutdown_complete->sctp_hdr.src_port =
997 sctp_conn->sub_conn[idx].connection.lcl_port;
998 shutdown_complete->sctp_hdr.dst_port =
999 sctp_conn->sub_conn[idx].connection.rmt_port;
1000 shutdown_complete->sctp_hdr.verification_tag = sctp_conn->remote_tag;
1002 vnet_sctp_set_chunk_type (&shutdown_complete->chunk_hdr, SHUTDOWN_COMPLETE);
1003 vnet_sctp_set_chunk_length (&shutdown_complete->chunk_hdr, chunk_len);
1005 vnet_buffer (b)->sctp.connection_index =
1006 sctp_conn->sub_conn[idx].connection.c_index;
1010 sctp_send_shutdown_complete (sctp_connection_t * sctp_conn)
1014 sctp_main_t *tm = vnet_get_sctp_main ();
1015 vlib_main_t *vm = vlib_get_main ();
1017 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
1020 b = vlib_get_buffer (vm, bi);
1021 sctp_init_buffer (vm, b);
1022 sctp_prepare_shutdown_complete_chunk (sctp_conn, b);
1024 u8 idx = sctp_pick_conn_idx_on_chunk (SHUTDOWN_COMPLETE);
1025 sctp_enqueue_to_output (vm, b, bi,
1026 sctp_conn->sub_conn[idx].connection.is_ip4);
1034 sctp_send_init (sctp_connection_t * sctp_conn)
1038 sctp_main_t *tm = vnet_get_sctp_main ();
1039 vlib_main_t *vm = vlib_get_main ();
1041 if (PREDICT_FALSE (sctp_get_free_buffer_index (tm, &bi)))
1044 b = vlib_get_buffer (vm, bi);
1045 u8 idx = sctp_pick_conn_idx_on_chunk (INIT);
1047 sctp_init_buffer (vm, b);
1048 sctp_prepare_init_chunk (sctp_conn, b);
1050 sctp_push_ip_hdr (tm, &sctp_conn->sub_conn[idx], b);
1051 sctp_enqueue_to_ip_lookup (vm, b, bi, sctp_conn->sub_conn[idx].c_is_ip4);
1053 /* Start the T1_INIT timer */
1054 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T1_INIT,
1055 sctp_conn->sub_conn[idx].RTO);
1057 /* Change state to COOKIE_WAIT */
1058 sctp_conn->state = SCTP_STATE_COOKIE_WAIT;
1060 /* Measure RTT with this */
1061 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
1065 * Push SCTP header and update connection variables
1068 sctp_push_hdr_i (sctp_connection_t * sctp_conn, u8 idx, vlib_buffer_t * b,
1069 sctp_state_t next_state)
1072 b->current_length + b->total_length_not_including_first_buffer;
1073 ASSERT (!b->total_length_not_including_first_buffer
1074 || (b->flags & VLIB_BUFFER_NEXT_PRESENT));
1076 SCTP_ADV_DBG_OUTPUT ("b->current_length = %u, "
1077 "b->current_data = %p "
1079 b->current_length, b->current_data, data_len);
1081 u16 bytes_to_add = sizeof (sctp_payload_data_chunk_t);
1082 u16 chunk_length = data_len + bytes_to_add - sizeof (sctp_header_t);
1084 bytes_to_add += vnet_sctp_calculate_padding (bytes_to_add + data_len);
1086 sctp_payload_data_chunk_t *data_chunk =
1087 vlib_buffer_push_uninit (b, bytes_to_add);
1089 data_chunk->sctp_hdr.checksum = 0;
1090 data_chunk->sctp_hdr.src_port =
1091 sctp_conn->sub_conn[idx].connection.lcl_port;
1092 data_chunk->sctp_hdr.dst_port =
1093 sctp_conn->sub_conn[idx].connection.rmt_port;
1094 data_chunk->sctp_hdr.verification_tag = sctp_conn->remote_tag;
1096 data_chunk->tsn = clib_host_to_net_u32 (sctp_conn->next_tsn);
1097 data_chunk->stream_id = clib_host_to_net_u16 (0);
1098 data_chunk->stream_seq = clib_host_to_net_u16 (0);
1100 vnet_sctp_set_chunk_type (&data_chunk->chunk_hdr, DATA);
1101 vnet_sctp_set_chunk_length (&data_chunk->chunk_hdr, chunk_length);
1103 vnet_sctp_set_bbit (&data_chunk->chunk_hdr);
1104 vnet_sctp_set_ebit (&data_chunk->chunk_hdr);
1106 SCTP_ADV_DBG_OUTPUT ("POINTER_WITH_DATA = %p, DATA_OFFSET = %u",
1107 b->data, b->current_data);
1109 sctp_conn->next_tsn += data_len;
1111 vnet_buffer (b)->sctp.connection_index =
1112 sctp_conn->sub_conn[idx].connection.c_index;
1116 sctp_push_header (transport_connection_t * trans_conn, vlib_buffer_t * b)
1118 sctp_connection_t *sctp_conn =
1119 sctp_get_connection_from_transport (trans_conn);
1121 u8 idx = sctp_pick_conn_idx_on_chunk (DATA);
1123 if (sctp_conn->sub_conn[idx].unacknowledged_hb >
1124 SCTP_ASSOCIATION_MAX_RETRANS)
1126 // The remote-peer is considered to be unreachable hence shutting down
1128 /* Start cleanup. App wasn't notified yet so use delete notify as
1129 * opposed to delete to cleanup session layer state. */
1130 stream_session_delete_notify (&sctp_conn->sub_conn
1131 [MAIN_SCTP_SUB_CONN_IDX].connection);
1133 sctp_connection_timers_reset (sctp_conn);
1135 sctp_connection_cleanup (sctp_conn);
1138 sctp_push_hdr_i (sctp_conn, idx, b, SCTP_STATE_ESTABLISHED);
1140 sctp_trajectory_add_start (b0, 3);
1147 sctp_validate_output_state_machine (sctp_connection_t * sctp_conn,
1151 switch (sctp_conn->state)
1153 case SCTP_STATE_CLOSED:
1154 if (chunk_type != INIT && chunk_type != INIT_ACK)
1157 case SCTP_STATE_ESTABLISHED:
1158 if (chunk_type != DATA && chunk_type != HEARTBEAT &&
1159 chunk_type != HEARTBEAT_ACK && chunk_type != SACK &&
1160 chunk_type != COOKIE_ACK && chunk_type != SHUTDOWN)
1163 case SCTP_STATE_COOKIE_WAIT:
1164 if (chunk_type != COOKIE_ECHO)
1167 case SCTP_STATE_SHUTDOWN_SENT:
1168 if (chunk_type != SHUTDOWN_COMPLETE)
1171 case SCTP_STATE_SHUTDOWN_RECEIVED:
1172 if (chunk_type != SHUTDOWN_ACK)
1180 sctp_is_retransmitting (sctp_connection_t * sctp_conn, u8 idx)
1182 return sctp_conn->sub_conn[idx].is_retransmitting;
1186 sctp46_output_inline (vlib_main_t * vm,
1187 vlib_node_runtime_t * node,
1188 vlib_frame_t * from_frame, int is_ip4)
1190 u32 n_left_from, next_index, *from, *to_next;
1191 u32 my_thread_index = vm->thread_index;
1193 from = vlib_frame_vector_args (from_frame);
1194 n_left_from = from_frame->n_vectors;
1195 next_index = node->cached_next_index;
1196 sctp_set_time_now (my_thread_index);
1198 while (n_left_from > 0)
1202 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1204 while (n_left_from > 0 && n_left_to_next > 0)
1208 sctp_header_t *sctp_hdr = 0;
1209 sctp_connection_t *sctp_conn;
1210 sctp_tx_trace_t *t0;
1211 sctp_header_t *th0 = 0;
1212 u32 error0 = SCTP_ERROR_PKTS_SENT, next0 =
1213 SCTP_OUTPUT_NEXT_IP_LOOKUP;
1215 #if SCTP_DEBUG_STATE_MACHINE
1216 u16 packet_length = 0;
1224 n_left_to_next -= 1;
1226 b0 = vlib_get_buffer (vm, bi0);
1229 sctp_connection_get (vnet_buffer (b0)->sctp.connection_index,
1232 if (PREDICT_FALSE (sctp_conn == 0))
1234 error0 = SCTP_ERROR_INVALID_CONNECTION;
1235 next0 = SCTP_OUTPUT_NEXT_DROP;
1239 u8 idx = sctp_pick_conn_idx_on_state (sctp_conn->state);
1241 th0 = vlib_buffer_get_current (b0);
1245 ip4_header_t *iph4 = vlib_buffer_push_ip4 (vm,
1247 &sctp_conn->sub_conn
1254 IP_PROTOCOL_SCTP, 1);
1256 u32 checksum = ip4_sctp_compute_checksum (vm, b0, iph4);
1258 sctp_hdr = ip4_next_header (iph4);
1259 sctp_hdr->checksum = checksum;
1261 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1263 #if SCTP_DEBUG_STATE_MACHINE
1264 packet_length = clib_net_to_host_u16 (iph4->length);
1269 ip6_header_t *iph6 = vlib_buffer_push_ip6 (vm,
1271 &sctp_conn->sub_conn
1275 &sctp_conn->sub_conn
1282 u32 checksum = ip6_sctp_compute_checksum (vm, b0, iph6, &bogus);
1285 sctp_hdr = ip6_next_header (iph6);
1286 sctp_hdr->checksum = checksum;
1288 vnet_buffer (b0)->l3_hdr_offset = (u8 *) iph6 - b0->data;
1289 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1291 #if SCTP_DEBUG_STATE_MACHINE
1292 packet_length = clib_net_to_host_u16 (iph6->payload_length);
1297 (sctp_conn->sub_conn[idx].connection.lcl_port ==
1299 || sctp_conn->sub_conn[idx].connection.lcl_port ==
1301 && (sctp_conn->sub_conn[idx].connection.rmt_port ==
1303 || sctp_conn->sub_conn[idx].connection.rmt_port ==
1304 sctp_hdr->src_port);
1306 sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
1307 u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
1311 SCTP_DBG_STATE_MACHINE ("BUFFER IS INCORRECT: conn_index = %u, "
1312 "packet_length = %u, "
1313 "chunk_type = %u [%s], "
1314 "connection.lcl_port = %u, sctp_hdr->src_port = %u, "
1315 "connection.rmt_port = %u, sctp_hdr->dst_port = %u",
1317 [idx].connection.c_index, packet_length,
1319 sctp_chunk_to_string (chunk_type),
1320 sctp_conn->sub_conn[idx].
1321 connection.lcl_port, sctp_hdr->src_port,
1322 sctp_conn->sub_conn[idx].
1323 connection.rmt_port,
1324 sctp_hdr->dst_port);
1326 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1327 next0 = SCTP_OUTPUT_NEXT_DROP;
1331 SCTP_DBG_STATE_MACHINE
1332 ("CONN_INDEX = %u, CURR_CONN_STATE = %u (%s), "
1333 "CHUNK_TYPE = %s, " "SRC_PORT = %u, DST_PORT = %u",
1334 sctp_conn->sub_conn[idx].connection.c_index,
1335 sctp_conn->state, sctp_state_to_string (sctp_conn->state),
1336 sctp_chunk_to_string (chunk_type), full_hdr->hdr.src_port,
1337 full_hdr->hdr.dst_port);
1339 /* Let's make sure the state-machine does not send anything crazy */
1340 #if SCTP_DEBUG_STATE_MACHINE
1341 if (sctp_validate_output_state_machine (sctp_conn, chunk_type) != 0)
1343 SCTP_DBG_STATE_MACHINE
1344 ("Sending the wrong chunk (%s) based on state-machine status (%s)",
1345 sctp_chunk_to_string (chunk_type),
1346 sctp_state_to_string (sctp_conn->state));
1348 error0 = SCTP_ERROR_UNKOWN_CHUNK;
1349 next0 = SCTP_OUTPUT_NEXT_DROP;
1354 /* Karn's algorithm: RTT measurements MUST NOT be made using
1355 * packets that were retransmitted
1357 if (!sctp_is_retransmitting (sctp_conn, idx))
1359 /* Measure RTT with this */
1360 if (chunk_type == DATA
1361 && sctp_conn->sub_conn[idx].RTO_pending == 0)
1363 sctp_conn->sub_conn[idx].RTO_pending = 1;
1364 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
1367 sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
1370 /* Let's take care of TIMERS */
1375 sctp_conn->state = SCTP_STATE_COOKIE_ECHOED;
1380 SCTP_ADV_DBG_OUTPUT ("PACKET_LENGTH = %u", packet_length);
1382 sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
1383 sctp_conn->sub_conn[idx].RTO);
1388 /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
1389 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
1390 sctp_conn->sub_conn[idx].RTO);
1391 sctp_conn->state = SCTP_STATE_SHUTDOWN_SENT;
1396 /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
1397 sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
1398 sctp_conn->sub_conn[idx].RTO);
1399 sctp_conn->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
1402 case SHUTDOWN_COMPLETE:
1404 sctp_conn->state = SCTP_STATE_CLOSED;
1409 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1410 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1412 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1414 SCTP_DBG_STATE_MACHINE ("CONNECTION_INDEX = %u, "
1417 sctp_conn->sub_conn[idx].connection.c_index,
1418 sctp_state_to_string (sctp_conn->state),
1419 sctp_chunk_to_string (chunk_type));
1421 vnet_sctp_common_hdr_params_host_to_net (&full_hdr->common_hdr);
1424 b0->error = node->errors[error0];
1425 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1427 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1430 clib_memcpy (&t0->sctp_header, th0,
1431 sizeof (t0->sctp_header));
1435 memset (&t0->sctp_header, 0, sizeof (t0->sctp_header));
1437 clib_memcpy (&t0->sctp_connection, sctp_conn,
1438 sizeof (t0->sctp_connection));
1441 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1442 n_left_to_next, bi0, next0);
1445 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1448 return from_frame->n_vectors;
1452 sctp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1453 vlib_frame_t * from_frame)
1455 return sctp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1459 sctp6_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, 0 /* is_ip4 */ );
1466 VLIB_REGISTER_NODE (sctp4_output_node) =
1468 .function = sctp4_output,.name = "sctp4-output",
1469 /* Takes a vector of packets. */
1470 .vector_size = sizeof (u32),
1471 .n_errors = SCTP_N_ERROR,
1472 .error_strings = sctp_error_strings,
1473 .n_next_nodes = SCTP_OUTPUT_N_NEXT,
1475 #define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
1476 foreach_sctp4_output_next
1479 .format_buffer = format_sctp_header,
1480 .format_trace = format_sctp_tx_trace,
1484 VLIB_NODE_FUNCTION_MULTIARCH (sctp4_output_node, sctp4_output);
1487 VLIB_REGISTER_NODE (sctp6_output_node) =
1489 .function = sctp6_output,
1490 .name = "sctp6-output",
1491 /* Takes a vector of packets. */
1492 .vector_size = sizeof (u32),
1493 .n_errors = SCTP_N_ERROR,
1494 .error_strings = sctp_error_strings,
1495 .n_next_nodes = SCTP_OUTPUT_N_NEXT,
1497 #define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
1498 foreach_sctp6_output_next
1501 .format_buffer = format_sctp_header,
1502 .format_trace = format_sctp_tx_trace,
1506 VLIB_NODE_FUNCTION_MULTIARCH (sctp6_output_node, sctp6_output);
1509 * fd.io coding-style-patch-verification: ON
1512 * eval: (c-set-style "gnu")