2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
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.
16 #include <vnet/tcp/tcp.h>
19 typedef enum _tcp_output_next
22 TCP_OUTPUT_NEXT_IP_LOOKUP,
23 TCP_OUTPUT_NEXT_IP_REWRITE,
24 TCP_OUTPUT_NEXT_IP_ARP,
28 #define foreach_tcp4_output_next \
29 _ (DROP, "error-drop") \
30 _ (IP_LOOKUP, "ip4-lookup") \
31 _ (IP_REWRITE, "ip4-rewrite") \
34 #define foreach_tcp6_output_next \
35 _ (DROP, "error-drop") \
36 _ (IP_LOOKUP, "ip6-lookup") \
37 _ (IP_REWRITE, "ip6-rewrite") \
38 _ (IP_ARP, "ip6-discover-neighbor")
40 static char *tcp_error_strings[] = {
41 #define tcp_error(n,s) s,
42 #include <vnet/tcp/tcp_error.def>
48 tcp_header_t tcp_header;
49 tcp_connection_t tcp_connection;
53 format_tcp_tx_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
58 u32 indent = format_get_indent (s);
60 s = format (s, "%U\n%U%U",
61 format_tcp_header, &t->tcp_header, 128,
62 format_white_space, indent,
63 format_tcp_connection, &t->tcp_connection, 1);
68 #ifndef CLIB_MARCH_VARIANT
70 tcp_window_compute_scale (u32 window)
73 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
79 * TCP's initial window
82 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
84 /* RFC 6928 recommends the value lower. However at the time our connections
85 * are initialized, fifos may not be allocated. Therefore, advertise the
86 * smallest possible unscaled window size and update once fifos are
87 * assigned to the session.
90 tcp_update_rcv_mss (tc);
91 TCP_IW_N_SEGMENTS * tc->mss;
93 return tcp_cfg.min_rx_fifo;
97 * Compute initial window and scale factor. As per RFC1323, window field in
98 * SYN and SYN-ACK segments is never scaled.
101 tcp_initial_window_to_advertise (tcp_connection_t * tc)
103 /* Compute rcv wscale only if peer advertised support for it */
104 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
105 tc->rcv_wscale = tcp_window_compute_scale (tcp_cfg.max_rx_fifo);
107 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
109 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
113 tcp_update_rcv_wnd (tcp_connection_t * tc)
115 u32 available_space, wnd;
118 ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection));
121 * Figure out how much space we have available
123 available_space = transport_max_rx_enqueue (&tc->connection);
124 if (PREDICT_FALSE (available_space < tc->rcv_opts.mss))
128 * Use the above and what we know about what we've previously advertised
129 * to compute the new window
131 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
133 /* Bad. Thou shalt not shrink */
134 if (PREDICT_FALSE ((i32) available_space < observed_wnd))
136 wnd = clib_max (observed_wnd, 0);
137 TCP_EVT (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
141 wnd = available_space;
144 /* Make sure we have a multiple of rcv_wscale */
145 if (wnd && tc->rcv_wscale)
147 wnd &= ~((1 << tc->rcv_wscale) - 1);
149 wnd = 1 << tc->rcv_wscale;
152 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
156 * Compute and return window to advertise, scaled as per RFC1323
159 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
161 if (state < TCP_STATE_ESTABLISHED)
162 return tcp_initial_window_to_advertise (tc);
164 tcp_update_rcv_wnd (tc);
165 return tc->rcv_wnd >> tc->rcv_wscale;
169 * Write TCP options to segment.
172 tcp_options_write (u8 * data, tcp_options_t * opts)
175 u32 buf, seq_len = 4;
177 if (tcp_opts_mss (opts))
179 *data++ = TCP_OPTION_MSS;
180 *data++ = TCP_OPTION_LEN_MSS;
181 buf = clib_host_to_net_u16 (opts->mss);
182 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
183 data += sizeof (opts->mss);
184 opts_len += TCP_OPTION_LEN_MSS;
187 if (tcp_opts_wscale (opts))
189 *data++ = TCP_OPTION_WINDOW_SCALE;
190 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
191 *data++ = opts->wscale;
192 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
195 if (tcp_opts_sack_permitted (opts))
197 *data++ = TCP_OPTION_SACK_PERMITTED;
198 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
199 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
202 if (tcp_opts_tstamp (opts))
204 *data++ = TCP_OPTION_TIMESTAMP;
205 *data++ = TCP_OPTION_LEN_TIMESTAMP;
206 buf = clib_host_to_net_u32 (opts->tsval);
207 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
208 data += sizeof (opts->tsval);
209 buf = clib_host_to_net_u32 (opts->tsecr);
210 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
211 data += sizeof (opts->tsecr);
212 opts_len += TCP_OPTION_LEN_TIMESTAMP;
215 if (tcp_opts_sack (opts))
219 if (opts->n_sack_blocks != 0)
221 *data++ = TCP_OPTION_SACK_BLOCK;
222 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
223 for (i = 0; i < opts->n_sack_blocks; i++)
225 buf = clib_host_to_net_u32 (opts->sacks[i].start);
226 clib_memcpy_fast (data, &buf, seq_len);
228 buf = clib_host_to_net_u32 (opts->sacks[i].end);
229 clib_memcpy_fast (data, &buf, seq_len);
232 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
236 /* Terminate TCP options */
239 *data++ = TCP_OPTION_EOL;
240 opts_len += TCP_OPTION_LEN_EOL;
243 /* Pad with zeroes to a u32 boundary */
246 *data++ = TCP_OPTION_NOOP;
247 opts_len += TCP_OPTION_LEN_NOOP;
253 tcp_make_syn_options (tcp_connection_t * tc, tcp_options_t * opts)
257 opts->flags |= TCP_OPTS_FLAG_MSS;
259 len += TCP_OPTION_LEN_MSS;
261 opts->flags |= TCP_OPTS_FLAG_WSCALE;
262 opts->wscale = tc->rcv_wscale;
263 len += TCP_OPTION_LEN_WINDOW_SCALE;
265 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
266 opts->tsval = tcp_time_now ();
268 len += TCP_OPTION_LEN_TIMESTAMP;
272 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
273 len += TCP_OPTION_LEN_SACK_PERMITTED;
276 /* Align to needed boundary */
277 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
282 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
286 opts->flags |= TCP_OPTS_FLAG_MSS;
288 len += TCP_OPTION_LEN_MSS;
290 if (tcp_opts_wscale (&tc->rcv_opts))
292 opts->flags |= TCP_OPTS_FLAG_WSCALE;
293 opts->wscale = tc->rcv_wscale;
294 len += TCP_OPTION_LEN_WINDOW_SCALE;
297 if (tcp_opts_tstamp (&tc->rcv_opts))
299 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
300 opts->tsval = tcp_time_now ();
301 opts->tsecr = tc->tsval_recent;
302 len += TCP_OPTION_LEN_TIMESTAMP;
305 if (tcp_opts_sack_permitted (&tc->rcv_opts))
307 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
308 len += TCP_OPTION_LEN_SACK_PERMITTED;
311 /* Align to needed boundary */
312 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
317 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
323 if (tcp_opts_tstamp (&tc->rcv_opts))
325 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
326 opts->tsval = tcp_tstamp (tc);
327 opts->tsecr = tc->tsval_recent;
328 len += TCP_OPTION_LEN_TIMESTAMP;
330 if (tcp_opts_sack_permitted (&tc->rcv_opts))
332 if (vec_len (tc->snd_sacks))
334 opts->flags |= TCP_OPTS_FLAG_SACK;
335 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
336 tc->snd_sack_pos = 0;
337 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
338 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
339 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
340 TCP_OPTS_MAX_SACK_BLOCKS);
341 tc->snd_sack_pos += opts->n_sack_blocks;
342 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
346 /* Align to needed boundary */
347 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
352 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
357 case TCP_STATE_ESTABLISHED:
358 case TCP_STATE_CLOSE_WAIT:
359 case TCP_STATE_FIN_WAIT_1:
360 case TCP_STATE_LAST_ACK:
361 case TCP_STATE_CLOSING:
362 case TCP_STATE_FIN_WAIT_2:
363 case TCP_STATE_TIME_WAIT:
364 case TCP_STATE_CLOSED:
365 return tcp_make_established_options (tc, opts);
366 case TCP_STATE_SYN_RCVD:
367 return tcp_make_synack_options (tc, opts);
368 case TCP_STATE_SYN_SENT:
369 return tcp_make_syn_options (tc, opts);
371 clib_warning ("State not handled! %d", state);
377 * Update burst send vars
379 * - Updates snd_mss to reflect the effective segment size that we can send
380 * by taking into account all TCP options, including SACKs.
381 * - Cache 'on the wire' options for reuse
382 * - Updates receive window which can be reused for a burst.
384 * This should *only* be called when doing bursts
387 tcp_update_burst_snd_vars (tcp_connection_t * tc)
389 tcp_main_t *tm = &tcp_main;
391 /* Compute options to be used for connection. These may be reused when
392 * sending data or to compute the effective mss (snd_mss) */
393 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
394 TCP_STATE_ESTABLISHED);
396 /* XXX check if MTU has been updated */
397 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
398 ASSERT (tc->snd_mss > 0);
400 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
403 tcp_update_rcv_wnd (tc);
405 if (tc->flags & TCP_CONN_RATE_SAMPLE)
406 tc->flags |= TCP_CONN_TRACK_BURST;
408 if (tc->snd_una == tc->snd_nxt)
409 tcp_cc_event (tc, TCP_CC_EVT_START_TX);
412 #endif /* CLIB_MARCH_VARIANT */
415 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
417 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
418 vlib_buffer_free_one (vm, b->next_buffer);
419 /* Zero all flags but free list index and trace flag */
420 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
422 b->current_length = 0;
423 b->total_length_not_including_first_buffer = 0;
424 vnet_buffer (b)->tcp.flags = 0;
426 /* Leave enough space for headers */
427 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
430 #ifndef CLIB_MARCH_VARIANT
432 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
434 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
435 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
436 b->total_length_not_including_first_buffer = 0;
438 vnet_buffer (b)->tcp.flags = 0;
439 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
440 /* Leave enough space for headers */
441 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
448 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
451 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
452 u8 tcp_opts_len, tcp_hdr_opts_len;
456 wnd = tcp_window_to_advertise (tc, state);
458 /* Make and write options */
459 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
460 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
462 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
463 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
465 tcp_options_write ((u8 *) (th + 1), snd_opts);
466 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
469 tcp_zero_rwnd_sent_on (tc);
471 tcp_zero_rwnd_sent_off (tc);
475 * Convert buffer to ACK
478 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
480 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
481 TCP_EVT (TCP_EVT_ACK_SENT, tc);
482 tc->rcv_las = tc->rcv_nxt;
486 * Convert buffer to FIN-ACK
489 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
491 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
495 * Convert buffer to SYN
498 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
500 u8 tcp_hdr_opts_len, tcp_opts_len;
503 tcp_options_t snd_opts;
505 initial_wnd = tcp_initial_window_to_advertise (tc);
507 /* Make and write options */
508 clib_memset (&snd_opts, 0, sizeof (snd_opts));
509 tcp_opts_len = tcp_make_syn_options (tc, &snd_opts);
510 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
512 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
513 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
515 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
516 tcp_options_write ((u8 *) (th + 1), &snd_opts);
520 * Convert buffer to SYN-ACK
523 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
525 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
526 u8 tcp_opts_len, tcp_hdr_opts_len;
530 clib_memset (snd_opts, 0, sizeof (*snd_opts));
531 initial_wnd = tcp_initial_window_to_advertise (tc);
532 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
533 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
535 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
536 tc->rcv_nxt, tcp_hdr_opts_len,
537 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
538 tcp_options_write ((u8 *) (th + 1), snd_opts);
540 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
544 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
545 u8 is_ip4, u32 fib_index, u8 flush)
547 vlib_main_t *vm = wrk->vm;
548 u32 *to_next, next_index;
551 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
554 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
555 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
557 /* Send to IP lookup */
558 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
559 tcp_trajectory_add_start (b, 1);
561 f = wrk->ip_lookup_tx_frames[!is_ip4];
564 f = vlib_get_frame_to_node (vm, next_index);
566 wrk->ip_lookup_tx_frames[!is_ip4] = f;
569 to_next = vlib_frame_vector_args (f);
570 to_next[f->n_vectors] = bi;
572 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
574 vlib_put_frame_to_node (vm, next_index, f);
575 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
580 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
581 u32 bi, u8 is_ip4, u32 fib_index)
583 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
587 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
588 u8 is_ip4, u32 fib_index)
590 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
591 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
592 session_flush_frames_main_thread (wrk->vm);
596 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
599 u32 *to_next, next_index;
602 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
605 /* Decide where to send the packet */
606 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
607 tcp_trajectory_add_start (b, 2);
609 /* Get frame to v4/6 output node */
610 f = wrk->tx_frames[!is_ip4];
613 f = vlib_get_frame_to_node (wrk->vm, next_index);
615 wrk->tx_frames[!is_ip4] = f;
617 to_next = vlib_frame_vector_args (f);
618 to_next[f->n_vectors] = bi;
620 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
622 vlib_put_frame_to_node (wrk->vm, next_index, f);
623 wrk->tx_frames[!is_ip4] = 0;
628 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
631 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
635 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
638 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
640 #endif /* CLIB_MARCH_VARIANT */
643 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
644 tcp_state_t state, u8 thread_index, u8 is_ip4)
649 ip4_address_t src_ip40, dst_ip40;
650 ip6_address_t src_ip60, dst_ip60;
651 u16 src_port, dst_port;
656 /* Find IP and TCP headers */
657 th0 = tcp_buffer_hdr (b0);
659 /* Save src and dst ip */
662 ih4 = vlib_buffer_get_current (b0);
663 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
664 src_ip40.as_u32 = ih4->src_address.as_u32;
665 dst_ip40.as_u32 = ih4->dst_address.as_u32;
669 ih6 = vlib_buffer_get_current (b0);
670 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
671 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
672 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
675 src_port = th0->src_port;
676 dst_port = th0->dst_port;
678 /* Try to determine what/why we're actually resetting */
679 if (state == TCP_STATE_CLOSED)
684 tmp = clib_net_to_host_u32 (th0->seq_number);
686 /* Got a SYN for no listener. */
687 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
688 ack = clib_host_to_net_u32 (tmp + 1);
693 flags = TCP_FLAG_RST;
694 seq = th0->ack_number;
698 tcp_reuse_buffer (vm, b0);
699 tcp_trajectory_add_start (b0, 4);
700 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
701 sizeof (tcp_header_t), flags, 0);
705 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
707 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
712 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
714 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
721 #ifndef CLIB_MARCH_VARIANT
723 * Send reset without reusing existing buffer
725 * It extracts connection info out of original packet
728 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
729 u32 thread_index, u8 is_ip4)
731 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
732 vlib_main_t *vm = wrk->vm;
734 u32 bi, sw_if_index, fib_index;
735 u8 tcp_hdr_len, flags = 0;
736 tcp_header_t *th, *pkt_th;
738 ip4_header_t *ih4, *pkt_ih4;
739 ip6_header_t *ih6, *pkt_ih6;
740 fib_protocol_t fib_proto;
742 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
745 b = vlib_get_buffer (vm, bi);
746 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
747 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
748 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
749 tcp_init_buffer (vm, b);
751 /* Make and write options */
752 tcp_hdr_len = sizeof (tcp_header_t);
756 pkt_ih4 = vlib_buffer_get_current (pkt);
757 pkt_th = ip4_next_header (pkt_ih4);
761 pkt_ih6 = vlib_buffer_get_current (pkt);
762 pkt_th = ip6_next_header (pkt_ih6);
765 if (tcp_ack (pkt_th))
767 flags = TCP_FLAG_RST;
768 seq = pkt_th->ack_number;
769 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
773 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
775 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
778 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
779 seq, ack, tcp_hdr_len, flags, 0);
781 /* Swap src and dst ip */
784 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
785 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
786 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
787 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
792 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
794 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
795 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
796 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
800 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
801 TCP_EVT (TCP_EVT_RST_SENT, tc);
802 vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4),
803 TCP_ERROR_RST_SENT, 1);
807 * Build and set reset packet for connection
810 tcp_send_reset (tcp_connection_t * tc)
812 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
813 vlib_main_t *vm = wrk->vm;
817 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
820 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
822 b = vlib_get_buffer (vm, bi);
823 tcp_init_buffer (vm, b);
825 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
826 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
827 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
828 flags = TCP_FLAG_RST;
829 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
830 tc->rcv_nxt, tcp_hdr_opts_len, flags,
832 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
833 ASSERT (opts_write_len == tc->snd_opts_len);
834 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
835 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
836 TCP_EVT (TCP_EVT_RST_SENT, tc);
837 vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4),
838 TCP_ERROR_RST_SENT, 1);
842 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
845 tcp_header_t *th = vlib_buffer_get_current (b);
846 vlib_main_t *vm = wrk->vm;
850 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
851 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
852 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
859 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
860 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
861 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
869 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
870 * The packet is not forwarded through tcpx_output to avoid doing lookups
871 * in the half_open pool.
874 tcp_send_syn (tcp_connection_t * tc)
876 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
877 vlib_main_t *vm = wrk->vm;
882 * Setup retransmit and establish timers before requesting buffer
883 * such that we can return if we've ran out.
885 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
886 tc->rto * TCP_TO_TIMER_TICK);
888 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
890 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
894 b = vlib_get_buffer (vm, bi);
895 tcp_init_buffer (vm, b);
896 tcp_make_syn (tc, b);
898 /* Measure RTT with this */
899 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
900 tc->rtt_seq = tc->snd_nxt;
903 tcp_push_ip_hdr (wrk, tc, b);
904 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
905 TCP_EVT (TCP_EVT_SYN_SENT, tc);
909 tcp_send_synack (tcp_connection_t * tc)
911 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
912 vlib_main_t *vm = wrk->vm;
916 tcp_retransmit_timer_force_update (tc);
918 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
920 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
924 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
925 b = vlib_get_buffer (vm, bi);
926 tcp_init_buffer (vm, b);
927 tcp_make_synack (tc, b);
928 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
929 TCP_EVT (TCP_EVT_SYNACK_SENT, tc);
933 * Flush tx frame populated by retransmits and timer pops
936 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
938 if (wrk->tx_frames[!is_ip4])
941 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
942 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
943 wrk->tx_frames[!is_ip4] = 0;
948 * Flush ip lookup tx frames populated by timer pops
951 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
953 if (wrk->ip_lookup_tx_frames[!is_ip4])
956 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
957 vlib_put_frame_to_node (wrk->vm, next_index,
958 wrk->ip_lookup_tx_frames[!is_ip4]);
959 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
964 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
967 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
969 tcp_flush_frame_to_output (wrk, 1);
970 tcp_flush_frame_to_output (wrk, 0);
971 tcp_flush_frame_to_ip_lookup (wrk, 1);
972 tcp_flush_frame_to_ip_lookup (wrk, 0);
979 tcp_send_fin (tcp_connection_t * tc)
981 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
982 vlib_main_t *vm = wrk->vm;
987 fin_snt = tc->flags & TCP_CONN_FINSNT;
991 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
993 /* Out of buffers so program fin retransmit ASAP */
994 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
998 /* Make sure retransmit retries a fin not data */
999 tc->flags |= TCP_CONN_FINSNT;
1003 tcp_retransmit_timer_force_update (tc);
1004 b = vlib_get_buffer (vm, bi);
1005 tcp_init_buffer (vm, b);
1006 tcp_make_fin (tc, b);
1007 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1008 TCP_EVT (TCP_EVT_FIN_SENT, tc);
1009 /* Account for the FIN */
1013 tc->flags |= TCP_CONN_FINSNT;
1014 tc->flags &= ~TCP_CONN_FINPNDG;
1015 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1020 * Push TCP header and update connection variables. Should only be called
1021 * for segments with data, not for 'control' packets.
1024 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1025 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1027 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1028 u32 advertise_wnd, data_len;
1029 tcp_main_t *tm = &tcp_main;
1032 data_len = b->current_length;
1033 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1034 data_len += b->total_length_not_including_first_buffer;
1036 vnet_buffer (b)->tcp.flags = 0;
1037 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1040 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1042 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1045 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1047 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1049 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1051 if (seq_geq (tc->psh_seq, snd_nxt)
1052 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1053 flags |= TCP_FLAG_PSH;
1055 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1056 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1061 clib_memcpy_fast ((u8 *) (th + 1),
1062 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1067 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1068 ASSERT (len == tc->snd_opts_len);
1072 * Update connection variables
1076 tc->snd_nxt += data_len;
1077 tc->rcv_las = tc->rcv_nxt;
1079 tc->bytes_out += data_len;
1080 tc->data_segs_out += 1;
1082 TCP_EVT (TCP_EVT_PKTIZE, tc);
1086 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1088 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1090 if (tc->flags & TCP_CONN_TRACK_BURST)
1092 tcp_bt_check_app_limited (tc);
1093 tcp_bt_track_tx (tc);
1094 tc->flags &= ~TCP_CONN_TRACK_BURST;
1097 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1098 /* update_snd_nxt */ 1);
1100 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1101 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1102 /* If not tracking an ACK, start tracking */
1103 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1105 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1106 tc->rtt_seq = tc->snd_nxt;
1108 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1110 tcp_retransmit_timer_set (tc);
1113 tcp_trajectory_add_start (b, 3);
1118 tcp_send_ack (tcp_connection_t * tc)
1120 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1121 vlib_main_t *vm = wrk->vm;
1125 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1127 tcp_update_rcv_wnd (tc);
1130 b = vlib_get_buffer (vm, bi);
1131 tcp_init_buffer (vm, b);
1132 tcp_make_ack (tc, b);
1133 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1137 tcp_program_ack (tcp_connection_t * tc)
1139 if (!(tc->flags & TCP_CONN_SNDACK))
1141 session_add_self_custom_tx_evt (&tc->connection, 1);
1142 tc->flags |= TCP_CONN_SNDACK;
1147 tcp_program_dupack (tcp_connection_t * tc)
1149 if (!(tc->flags & TCP_CONN_SNDACK))
1151 session_add_self_custom_tx_evt (&tc->connection, 1);
1152 tc->flags |= TCP_CONN_SNDACK;
1154 if (tc->pending_dupacks < 255)
1155 tc->pending_dupacks += 1;
1159 tcp_program_fastretransmit (tcp_connection_t * tc)
1161 if (!(tc->flags & TCP_CONN_FRXT_PENDING))
1163 session_add_self_custom_tx_evt (&tc->connection, 0);
1164 tc->flags |= TCP_CONN_FRXT_PENDING;
1169 * Delayed ack timer handler
1171 * Sends delayed ACK when timer expires
1174 tcp_timer_delack_handler (u32 index)
1176 u32 thread_index = vlib_get_thread_index ();
1177 tcp_connection_t *tc;
1179 tc = tcp_connection_get (index, thread_index);
1180 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1185 * Send Window Update ACK,
1186 * ensuring that it will be sent once, if RWND became non-zero,
1187 * after zero RWND has been advertised in ACK before
1190 tcp_send_window_update_ack (tcp_connection_t * tc)
1194 if (tcp_zero_rwnd_sent (tc))
1196 win = tcp_window_to_advertise (tc, tc->state);
1199 tcp_zero_rwnd_sent_off (tc);
1200 tcp_program_ack (tc);
1206 * Allocate a new buffer and build a new tcp segment
1208 * @param wrk tcp worker
1209 * @param tc connection for which the segment will be allocated
1210 * @param offset offset of the first byte in the tx fifo
1211 * @param max_deq_byte segment size
1212 * @param[out] b pointer to buffer allocated
1214 * @return the number of bytes in the segment or 0 if buffer cannot be
1215 * allocated or no data available
1218 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1219 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1221 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1222 vlib_main_t *vm = wrk->vm;
1227 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1232 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1235 * Allocate and fill in buffer(s)
1238 /* Easy case, buffer size greater than mss */
1239 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1241 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1243 *b = vlib_get_buffer (vm, bi);
1244 data = tcp_init_buffer (vm, *b);
1245 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1247 ASSERT (n_bytes == max_deq_bytes);
1248 b[0]->current_length = n_bytes;
1249 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1250 /* burst */ 0, /* update_snd_nxt */ 0);
1252 /* Split mss into multiple buffers */
1255 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1256 u16 n_peeked, len_to_deq;
1257 vlib_buffer_t *chain_b, *prev_b;
1260 /* Make sure we have enough buffers */
1261 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1262 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1263 CLIB_CACHE_LINE_BYTES);
1264 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1265 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1268 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1272 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1273 data = tcp_init_buffer (vm, *b);
1274 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1276 TRANSPORT_MAX_HDRS_LEN);
1277 b[0]->current_length = n_bytes;
1278 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1279 b[0]->total_length_not_including_first_buffer = 0;
1280 max_deq_bytes -= n_bytes;
1283 for (i = 1; i < n_bufs_per_seg; i++)
1286 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1287 chain_bi = wrk->tx_buffers[--n_bufs];
1288 chain_b = vlib_get_buffer (vm, chain_bi);
1289 chain_b->current_data = 0;
1290 data = vlib_buffer_get_current (chain_b);
1291 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1294 ASSERT (n_peeked == len_to_deq);
1295 n_bytes += n_peeked;
1296 chain_b->current_length = n_peeked;
1297 chain_b->next_buffer = 0;
1299 /* update previous buffer */
1300 prev_b->next_buffer = chain_bi;
1301 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1303 max_deq_bytes -= n_peeked;
1304 b[0]->total_length_not_including_first_buffer += n_peeked;
1307 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1308 /* burst */ 0, /* update_snd_nxt */ 0);
1310 if (PREDICT_FALSE (n_bufs))
1312 clib_warning ("not all buffers consumed");
1313 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1317 ASSERT (n_bytes > 0);
1318 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1324 * Build a retransmit segment
1326 * @return the number of bytes in the segment or 0 if there's nothing to
1330 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1331 tcp_connection_t * tc, u32 offset,
1332 u32 max_deq_bytes, vlib_buffer_t ** b)
1334 u32 start, available_bytes;
1337 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1338 ASSERT (max_deq_bytes != 0);
1341 * Make sure we can retransmit something
1343 available_bytes = transport_max_tx_dequeue (&tc->connection);
1344 ASSERT (available_bytes >= offset);
1345 available_bytes -= offset;
1346 if (!available_bytes)
1349 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1350 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1352 /* Start is beyond snd_congestion */
1353 start = tc->snd_una + offset;
1354 if (seq_geq (start, tc->snd_congestion))
1357 /* Don't overshoot snd_congestion */
1358 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1360 max_deq_bytes = tc->snd_congestion - start;
1361 if (max_deq_bytes == 0)
1365 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1369 if (tcp_in_fastrecovery (tc))
1371 tc->snd_rxt_bytes += n_bytes;
1372 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1373 tcp_bt_track_rxt (tc, start, start + n_bytes);
1376 tc->bytes_retrans += n_bytes;
1377 tc->segs_retrans += 1;
1378 TCP_EVT (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1383 * Reset congestion control, switch cwnd to loss window and try again.
1386 tcp_cc_init_rxt_timeout (tcp_connection_t * tc)
1388 TCP_EVT (TCP_EVT_CC_EVT, tc, 6);
1389 tc->prev_ssthresh = tc->ssthresh;
1390 tc->prev_cwnd = tc->cwnd;
1392 /* Clear fast recovery state if needed */
1393 if (tcp_in_fastrecovery (tc))
1394 tcp_cc_fastrecovery_clear (tc);
1396 /* Let cc algo decide loss cwnd and ssthresh */
1399 /* Start again from the beginning */
1400 tc->snd_congestion = tc->snd_nxt;
1401 tc->rcv_dupacks = 0;
1403 tc->cwnd_acc_bytes = 0;
1404 tc->tr_occurences += 1;
1405 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1406 tcp_recovery_on (tc);
1410 tcp_timer_retransmit_handler (u32 tc_index)
1412 u32 thread_index = vlib_get_thread_index ();
1413 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1414 vlib_main_t *vm = wrk->vm;
1415 tcp_connection_t *tc;
1416 vlib_buffer_t *b = 0;
1419 tc = tcp_connection_get (tc_index, thread_index);
1421 /* Note: the connection may have been closed and pool_put */
1422 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1425 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1427 /* Wait-close and retransmit could pop at the same time */
1428 if (tc->state == TCP_STATE_CLOSED)
1431 if (tc->state >= TCP_STATE_ESTABLISHED)
1433 TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
1435 /* Lost FIN, retransmit and return */
1436 if (tc->flags & TCP_CONN_FINSNT)
1440 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1444 /* Shouldn't be here. This condition is tricky because it has to take
1445 * into account boff > 0 due to persist timeout. */
1446 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1447 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1448 && !tcp_flight_size (tc)))
1450 ASSERT (!tcp_in_recovery (tc));
1455 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1456 * to persist timer timeout */
1457 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1460 tcp_update_rto (tc);
1463 /* Peer is dead or network connectivity is lost. Close connection.
1464 * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For
1465 * a min rto of 0.2s we need to retry about 8 times. */
1466 if (tc->rto_boff >= TCP_RTO_BOFF_MAX)
1468 tcp_send_reset (tc);
1469 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1470 session_transport_closing_notify (&tc->connection);
1471 tcp_connection_timers_reset (tc);
1472 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
1476 /* Increment RTO backoff (also equal to number of retries) and go back
1477 * to first un-acked byte */
1480 /* TODO be less aggressive about clearing scoreboard */
1481 scoreboard_clear (&tc->sack_sb);
1483 /* First retransmit timeout */
1484 if (tc->rto_boff == 1)
1486 tcp_cc_init_rxt_timeout (tc);
1487 /* Record timestamp. Eifel detection algorithm RFC3522 */
1488 tc->snd_rxt_ts = tcp_tstamp (tc);
1491 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1492 tcp_bt_flush_samples (tc);
1494 /* If we've sent beyond snd_congestion, update it */
1495 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1496 tc->snd_nxt = tc->snd_una;
1498 /* Send one segment. n_bytes may be zero due to buffer shortfall */
1499 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1502 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1506 bi = vlib_get_buffer_index (vm, b);
1507 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1509 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1510 tcp_retransmit_timer_force_update (tc);
1512 /* Retransmit SYN-ACK */
1513 else if (tc->state == TCP_STATE_SYN_RCVD)
1515 TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
1519 /* Passive open establish timeout */
1520 if (tc->rto > TCP_ESTABLISH_TIME >> 1)
1522 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1523 tcp_connection_timers_reset (tc);
1524 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
1528 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1530 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1535 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1536 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1538 tcp_retransmit_timer_force_update (tc);
1540 b = vlib_get_buffer (vm, bi);
1541 tcp_init_buffer (vm, b);
1542 tcp_make_synack (tc, b);
1543 TCP_EVT (TCP_EVT_SYN_RXT, tc, 1);
1545 /* Retransmit timer already updated, just enqueue to output */
1546 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1550 ASSERT (tc->state == TCP_STATE_CLOSED);
1556 * SYN retransmit timer handler. Active open only.
1559 tcp_timer_retransmit_syn_handler (u32 tc_index)
1561 u32 thread_index = vlib_get_thread_index ();
1562 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1563 vlib_main_t *vm = wrk->vm;
1564 tcp_connection_t *tc;
1565 vlib_buffer_t *b = 0;
1568 tc = tcp_half_open_connection_get (tc_index);
1570 /* Note: the connection may have transitioned to ESTABLISHED... */
1571 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1574 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1576 /* Half-open connection actually moved to established but we were
1577 * waiting for syn retransmit to pop to call cleanup from the right
1579 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1581 if (tcp_half_open_connection_cleanup (tc))
1582 TCP_DBG ("could not remove half-open connection");
1586 TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
1589 /* Active open establish timeout */
1590 if (tc->rto >= TCP_ESTABLISH_TIME >> 1)
1592 session_stream_connect_notify (&tc->connection, 1 /* fail */ );
1593 tcp_connection_cleanup (tc);
1597 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1599 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1603 /* Try without increasing RTO a number of times. If this fails,
1604 * start growing RTO exponentially */
1606 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1607 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1609 b = vlib_get_buffer (vm, bi);
1610 tcp_init_buffer (vm, b);
1611 tcp_make_syn (tc, b);
1613 TCP_EVT (TCP_EVT_SYN_RXT, tc, 0);
1615 /* This goes straight to ipx_lookup */
1616 tcp_push_ip_hdr (wrk, tc, b);
1617 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1619 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1620 tc->rto * TCP_TO_TIMER_TICK);
1624 * Got 0 snd_wnd from peer, try to do something about it.
1628 tcp_timer_persist_handler (u32 index)
1630 u32 thread_index = vlib_get_thread_index ();
1631 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1632 u32 bi, max_snd_bytes, available_bytes, offset;
1633 tcp_main_t *tm = vnet_get_tcp_main ();
1634 vlib_main_t *vm = wrk->vm;
1635 tcp_connection_t *tc;
1640 tc = tcp_connection_get_if_valid (index, thread_index);
1644 /* Make sure timer handle is set to invalid */
1645 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1647 /* Problem already solved or worse */
1648 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1649 || (tc->flags & TCP_CONN_FINSNT))
1652 available_bytes = transport_max_tx_dequeue (&tc->connection);
1653 offset = tc->snd_nxt - tc->snd_una;
1655 /* Reprogram persist if no new bytes available to send. We may have data
1657 if (!available_bytes)
1659 tcp_persist_timer_set (tc);
1663 if (available_bytes <= offset)
1665 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1669 /* Increment RTO backoff */
1671 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1674 * Try to force the first unsent segment (or buffer)
1676 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1678 tcp_persist_timer_set (tc);
1681 b = vlib_get_buffer (vm, bi);
1682 data = tcp_init_buffer (vm, b);
1684 tcp_validate_txf_size (tc, offset);
1685 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1686 max_snd_bytes = clib_min (tc->snd_mss,
1687 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1688 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1690 b->current_length = n_bytes;
1691 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1692 || tc->snd_nxt == tc->snd_una_max
1693 || tc->rto_boff > 1));
1695 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1696 /* burst */ 0, /* update_snd_nxt */ 1);
1697 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1698 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1699 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1701 /* Just sent new data, enable retransmit */
1702 tcp_retransmit_timer_update (tc);
1706 * Retransmit first unacked segment
1709 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1711 vlib_main_t *vm = wrk->vm;
1715 TCP_EVT (TCP_EVT_CC_EVT, tc, 1);
1717 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1721 bi = vlib_get_buffer_index (vm, b);
1722 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1728 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1731 u32 offset, n_segs = 0, n_written, bi, available_wnd;
1732 vlib_main_t *vm = wrk->vm;
1733 vlib_buffer_t *b = 0;
1735 offset = tc->snd_nxt - tc->snd_una;
1736 available_wnd = tc->snd_wnd - offset;
1737 burst_size = clib_min (burst_size, available_wnd / tc->snd_mss);
1739 while (n_segs < burst_size)
1741 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1745 bi = vlib_get_buffer_index (vm, b);
1746 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1747 offset += n_written;
1750 tc->snd_nxt += n_written;
1751 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1758 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1759 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1760 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1763 * Do fast retransmit with SACKs
1766 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1769 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1770 sack_scoreboard_hole_t *hole;
1771 vlib_main_t *vm = wrk->vm;
1772 vlib_buffer_t *b = 0;
1773 sack_scoreboard_t *sb;
1776 u8 snd_limited = 0, can_rescue = 0;
1778 ASSERT (tcp_in_fastrecovery (tc));
1780 snd_space = tcp_available_cc_snd_space (tc);
1781 if (snd_space < tc->snd_mss)
1783 tcp_program_fastretransmit (tc);
1787 TCP_EVT (TCP_EVT_CC_EVT, tc, 0);
1789 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1791 max_deq = transport_max_tx_dequeue (&tc->connection);
1792 max_deq -= tc->snd_nxt - tc->snd_una;
1794 while (snd_space > 0 && n_segs < burst_size)
1796 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1802 snd_space = clib_min (max_deq, snd_space);
1803 burst_size = clib_min (burst_size - n_segs,
1804 snd_space / tc->snd_mss);
1805 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1806 if (max_deq > n_segs_now * tc->snd_mss)
1807 tcp_program_fastretransmit (tc);
1808 n_segs += n_segs_now;
1812 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1815 /* If rescue rxt undefined or less than snd_una then one segment of
1816 * up to SMSS octets that MUST include the highest outstanding
1817 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1818 * RecoveryPoint. HighRxt MUST NOT be updated.
1820 max_bytes = clib_min (tc->snd_mss,
1821 tc->snd_congestion - tc->snd_una);
1822 max_bytes = clib_min (max_bytes, snd_space);
1823 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1824 sb->rescue_rxt = tc->snd_congestion;
1825 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1830 bi = vlib_get_buffer_index (vm, b);
1831 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1836 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1837 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1841 offset = sb->high_rxt - tc->snd_una;
1842 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1844 ASSERT (n_written <= snd_space);
1846 /* Nothing left to retransmit */
1850 bi = vlib_get_buffer_index (vm, b);
1851 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1853 sb->high_rxt += n_written;
1854 snd_space -= n_written;
1859 tcp_program_fastretransmit (tc);
1866 * Fast retransmit without SACK info
1869 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1872 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1873 vlib_main_t *vm = wrk->vm;
1874 int snd_space, n_segs = 0;
1877 ASSERT (tcp_in_fastrecovery (tc));
1878 TCP_EVT (TCP_EVT_CC_EVT, tc, 0);
1880 snd_space = tcp_available_cc_snd_space (tc);
1882 if (!tcp_fastrecovery_first (tc))
1885 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1887 while (snd_space > 0 && n_segs < burst_size)
1889 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1892 /* Nothing left to retransmit */
1896 bi = vlib_get_buffer_index (vm, b);
1897 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1898 snd_space -= n_written;
1899 offset += n_written;
1903 if (n_segs == burst_size)
1908 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1909 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1912 max_deq = transport_max_tx_dequeue (&tc->connection);
1913 max_deq -= tc->snd_nxt - tc->snd_una;
1916 snd_space = clib_min (max_deq, snd_space);
1917 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1918 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1919 if (max_deq > n_segs_now * tc->snd_mss)
1920 tcp_program_fastretransmit (tc);
1921 n_segs += n_segs_now;
1925 tcp_fastrecovery_first_off (tc);
1930 * Do fast retransmit
1933 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1936 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1937 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1939 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1943 tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size)
1947 if (!tc->pending_dupacks)
1953 /* If we're supposed to send dupacks but have no ooo data
1954 * send only one ack */
1955 if (!vec_len (tc->snd_sacks))
1961 /* Start with first sack block */
1962 tc->snd_sack_pos = 0;
1964 /* Generate enough dupacks to cover all sack blocks. Do not generate
1965 * more sacks than the number of packets received. But do generate at
1966 * least 3, i.e., the number needed to signal congestion, if needed. */
1967 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1968 n_acks = clib_min (n_acks, tc->pending_dupacks);
1969 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1970 for (j = 0; j < clib_min (n_acks, max_burst_size); j++)
1973 if (n_acks < max_burst_size)
1975 tc->pending_dupacks = 0;
1976 tc->snd_sack_pos = 0;
1977 tc->dupacks_out += n_acks;
1982 TCP_DBG ("constrained by burst size");
1983 tc->pending_dupacks = n_acks - max_burst_size;
1984 tc->dupacks_out += max_burst_size;
1985 tcp_program_dupack (tc);
1986 return max_burst_size;
1991 tcp_do_fastretransmit (tcp_connection_t * tc, u32 max_burst_size)
1993 u32 n_segs = 0, burst_size, sent_bytes, burst_bytes;
1994 tcp_worker_ctx_t *wrk;
1996 wrk = tcp_get_worker (tc->c_thread_index);
1997 burst_bytes = transport_connection_tx_pacer_burst (&tc->connection,
1999 clib_time.last_cpu_time);
2000 burst_size = clib_min (max_burst_size, burst_bytes / tc->snd_mss);
2003 tcp_program_fastretransmit (tc);
2007 n_segs = tcp_fast_retransmit (wrk, tc, burst_size);
2008 sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes);
2009 transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes);
2014 tcp_session_custom_tx (void *conn, u32 max_burst_size)
2016 tcp_connection_t *tc = (tcp_connection_t *) conn;
2019 if (tcp_in_fastrecovery (tc) && (tc->flags & TCP_CONN_FRXT_PENDING))
2021 tc->flags &= ~TCP_CONN_FRXT_PENDING;
2022 n_segs = tcp_do_fastretransmit (tc, max_burst_size);
2023 max_burst_size -= n_segs;
2026 if (!(tc->flags & TCP_CONN_SNDACK))
2029 tc->flags &= ~TCP_CONN_SNDACK;
2031 /* We have retransmitted packets and no dupack */
2032 if (n_segs && !tc->pending_dupacks)
2035 if (!max_burst_size)
2037 tcp_program_ack (tc);
2038 return max_burst_size;
2041 n_segs += tcp_send_acks (tc, max_burst_size);
2045 #endif /* CLIB_MARCH_VARIANT */
2048 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2049 u16 * next0, u32 * error0)
2051 ip_adjacency_t *adj;
2054 /* Not thread safe but as long as the connection exists the adj should
2056 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2058 if (ai == ADJ_INDEX_INVALID)
2060 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2061 *next0 = TCP_OUTPUT_NEXT_DROP;
2062 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2067 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2068 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2069 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2070 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2073 *next0 = TCP_OUTPUT_NEXT_DROP;
2074 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2076 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2080 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2081 u32 * to_next, u32 n_bufs)
2083 u32 n_trace = vlib_get_trace_count (vm, node);
2084 tcp_connection_t *tc;
2090 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2092 b = vlib_get_buffer (vm, to_next[i]);
2093 th = vlib_buffer_get_current (b);
2094 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2096 t = vlib_add_trace (vm, node, b, sizeof (*t));
2097 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2098 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2103 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2104 tcp_connection_t * tc0, u8 is_ip4)
2106 tcp_header_t *th0 = 0;
2108 th0 = vlib_buffer_get_current (b0);
2109 TCP_EVT (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2112 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2113 IP_PROTOCOL_TCP, 1);
2114 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2115 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2121 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2122 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2123 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2124 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2125 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2131 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2132 vlib_node_runtime_t * error_node, u16 * next0,
2135 /* If next_index is not drop use it */
2136 if (tc0->next_node_index)
2138 *next0 = tc0->next_node_index;
2139 vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
2142 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2143 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2149 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2150 tcp_output_handle_link_local (tc0, b0, next0, &error0);
2152 if (PREDICT_FALSE (error0))
2154 b0->error = error_node->errors[error0];
2159 if (!TCP_ALWAYS_ACK)
2160 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2166 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2167 vlib_frame_t * frame, int is_ip4)
2169 u32 n_left_from, *from, thread_index = vm->thread_index;
2170 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2171 u16 nexts[VLIB_FRAME_SIZE], *next;
2172 vlib_node_runtime_t *error_node;
2174 error_node = vlib_node_get_runtime (vm, tcp_node_index (output, is_ip4));
2176 from = vlib_frame_vector_args (frame);
2177 n_left_from = frame->n_vectors;
2178 tcp_set_time_now (tcp_get_worker (thread_index));
2180 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2181 tcp46_output_trace_frame (vm, node, from, n_left_from);
2183 vlib_get_buffers (vm, from, bufs, n_left_from);
2187 while (n_left_from >= 4)
2189 tcp_connection_t *tc0, *tc1;
2192 vlib_prefetch_buffer_header (b[2], STORE);
2193 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2195 vlib_prefetch_buffer_header (b[3], STORE);
2196 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2199 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2201 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2203 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2206 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2207 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2209 tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4);
2210 tcp_output_handle_packet (tc1, b[1], error_node, &next[1], is_ip4);
2216 while (n_left_from > 0)
2218 tcp_connection_t *tc0;
2220 if (n_left_from > 1)
2222 vlib_prefetch_buffer_header (b[1], STORE);
2223 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2226 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2227 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2230 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2231 tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4);
2238 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2239 vlib_node_increment_counter (vm, tcp_node_index (output, is_ip4),
2240 TCP_ERROR_PKTS_SENT, frame->n_vectors);
2241 return frame->n_vectors;
2244 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2245 vlib_frame_t * from_frame)
2247 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2250 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2251 vlib_frame_t * from_frame)
2253 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2257 VLIB_REGISTER_NODE (tcp4_output_node) =
2259 .name = "tcp4-output",
2260 /* Takes a vector of packets. */
2261 .vector_size = sizeof (u32),
2262 .n_errors = TCP_N_ERROR,
2263 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2264 .error_strings = tcp_error_strings,
2265 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2267 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2268 foreach_tcp4_output_next
2271 .format_buffer = format_tcp_header,
2272 .format_trace = format_tcp_tx_trace,
2277 VLIB_REGISTER_NODE (tcp6_output_node) =
2279 .name = "tcp6-output",
2280 /* Takes a vector of packets. */
2281 .vector_size = sizeof (u32),
2282 .n_errors = TCP_N_ERROR,
2283 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2284 .error_strings = tcp_error_strings,
2285 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2287 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2288 foreach_tcp6_output_next
2291 .format_buffer = format_tcp_header,
2292 .format_trace = format_tcp_tx_trace,
2296 typedef enum _tcp_reset_next
2298 TCP_RESET_NEXT_DROP,
2299 TCP_RESET_NEXT_IP_LOOKUP,
2303 #define foreach_tcp4_reset_next \
2304 _(DROP, "error-drop") \
2305 _(IP_LOOKUP, "ip4-lookup")
2307 #define foreach_tcp6_reset_next \
2308 _(DROP, "error-drop") \
2309 _(IP_LOOKUP, "ip6-lookup")
2312 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2313 vlib_frame_t * from_frame, u8 is_ip4)
2315 u32 n_left_from, next_index, *from, *to_next;
2316 u32 my_thread_index = vm->thread_index;
2318 from = vlib_frame_vector_args (from_frame);
2319 n_left_from = from_frame->n_vectors;
2321 next_index = node->cached_next_index;
2323 while (n_left_from > 0)
2327 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2329 while (n_left_from > 0 && n_left_to_next > 0)
2335 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2342 n_left_to_next -= 1;
2344 b0 = vlib_get_buffer (vm, bi0);
2346 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2347 my_thread_index, is_ip4))
2349 error0 = TCP_ERROR_LOOKUP_DROPS;
2350 next0 = TCP_RESET_NEXT_DROP;
2354 /* Prepare to send to IP lookup */
2355 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2356 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2359 b0->error = node->errors[error0];
2360 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2361 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2363 th0 = vlib_buffer_get_current (b0);
2365 th0 = ip4_next_header ((ip4_header_t *) th0);
2367 th0 = ip6_next_header ((ip6_header_t *) th0);
2368 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2369 clib_memcpy_fast (&t0->tcp_header, th0,
2370 sizeof (t0->tcp_header));
2373 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2374 n_left_to_next, bi0, next0);
2376 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2378 return from_frame->n_vectors;
2381 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2382 vlib_frame_t * from_frame)
2384 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2387 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2388 vlib_frame_t * from_frame)
2390 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2394 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2395 .name = "tcp4-reset",
2396 .vector_size = sizeof (u32),
2397 .n_errors = TCP_N_ERROR,
2398 .error_strings = tcp_error_strings,
2399 .n_next_nodes = TCP_RESET_N_NEXT,
2401 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2402 foreach_tcp4_reset_next
2405 .format_trace = format_tcp_tx_trace,
2410 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2411 .name = "tcp6-reset",
2412 .vector_size = sizeof (u32),
2413 .n_errors = TCP_N_ERROR,
2414 .error_strings = tcp_error_strings,
2415 .n_next_nodes = TCP_RESET_N_NEXT,
2417 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2418 foreach_tcp6_reset_next
2421 .format_trace = format_tcp_tx_trace,
2426 * fd.io coding-style-patch-verification: ON
2429 * eval: (c-set-style "gnu")