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 * Update max segment size we're able to process.
81 * The value is constrained by our interface's MTU and IP options. It is
82 * also what we advertise to our peer.
85 tcp_update_rcv_mss (tcp_connection_t * tc)
87 /* TODO find our iface MTU */
88 tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t);
92 * TCP's initial window
95 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
97 /* RFC 6928 recommends the value lower. However at the time our connections
98 * are initialized, fifos may not be allocated. Therefore, advertise the
99 * smallest possible unscaled window size and update once fifos are
100 * assigned to the session.
103 tcp_update_rcv_mss (tc);
104 TCP_IW_N_SEGMENTS * tc->mss;
106 return TCP_MIN_RX_FIFO_SIZE;
110 * Compute initial window and scale factor. As per RFC1323, window field in
111 * SYN and SYN-ACK segments is never scaled.
114 tcp_initial_window_to_advertise (tcp_connection_t * tc)
116 tcp_main_t *tm = &tcp_main;
119 /* Initial wnd for SYN. Fifos are not allocated yet.
120 * Use some predefined value. For SYN-ACK we still want the
121 * scale to be computed in the same way */
122 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
124 /* Compute rcv wscale only if peer advertised support for it */
125 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
126 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
128 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
130 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
134 tcp_update_rcv_wnd (tcp_connection_t * tc)
136 u32 available_space, wnd;
139 ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection));
142 * Figure out how much space we have available
144 available_space = transport_max_rx_enqueue (&tc->connection);
145 if (PREDICT_FALSE (available_space < tc->rcv_opts.mss))
149 * Use the above and what we know about what we've previously advertised
150 * to compute the new window
152 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
154 /* Bad. Thou shalt not shrink */
155 if (PREDICT_FALSE ((i32) available_space < observed_wnd))
157 wnd = clib_max (observed_wnd, 0);
158 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
162 wnd = available_space;
165 /* Make sure we have a multiple of rcv_wscale */
166 if (wnd && tc->rcv_wscale)
168 wnd &= ~((1 << tc->rcv_wscale) - 1);
170 wnd = 1 << tc->rcv_wscale;
173 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
177 * Compute and return window to advertise, scaled as per RFC1323
180 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
182 if (state < TCP_STATE_ESTABLISHED)
183 return tcp_initial_window_to_advertise (tc);
185 tcp_update_rcv_wnd (tc);
186 return tc->rcv_wnd >> tc->rcv_wscale;
190 * Write TCP options to segment.
193 tcp_options_write (u8 * data, tcp_options_t * opts)
196 u32 buf, seq_len = 4;
198 if (tcp_opts_mss (opts))
200 *data++ = TCP_OPTION_MSS;
201 *data++ = TCP_OPTION_LEN_MSS;
202 buf = clib_host_to_net_u16 (opts->mss);
203 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
204 data += sizeof (opts->mss);
205 opts_len += TCP_OPTION_LEN_MSS;
208 if (tcp_opts_wscale (opts))
210 *data++ = TCP_OPTION_WINDOW_SCALE;
211 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
212 *data++ = opts->wscale;
213 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
216 if (tcp_opts_sack_permitted (opts))
218 *data++ = TCP_OPTION_SACK_PERMITTED;
219 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
220 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
223 if (tcp_opts_tstamp (opts))
225 *data++ = TCP_OPTION_TIMESTAMP;
226 *data++ = TCP_OPTION_LEN_TIMESTAMP;
227 buf = clib_host_to_net_u32 (opts->tsval);
228 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
229 data += sizeof (opts->tsval);
230 buf = clib_host_to_net_u32 (opts->tsecr);
231 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
232 data += sizeof (opts->tsecr);
233 opts_len += TCP_OPTION_LEN_TIMESTAMP;
236 if (tcp_opts_sack (opts))
240 if (opts->n_sack_blocks != 0)
242 *data++ = TCP_OPTION_SACK_BLOCK;
243 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
244 for (i = 0; i < opts->n_sack_blocks; i++)
246 buf = clib_host_to_net_u32 (opts->sacks[i].start);
247 clib_memcpy_fast (data, &buf, seq_len);
249 buf = clib_host_to_net_u32 (opts->sacks[i].end);
250 clib_memcpy_fast (data, &buf, seq_len);
253 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
257 /* Terminate TCP options */
260 *data++ = TCP_OPTION_EOL;
261 opts_len += TCP_OPTION_LEN_EOL;
264 /* Pad with zeroes to a u32 boundary */
267 *data++ = TCP_OPTION_NOOP;
268 opts_len += TCP_OPTION_LEN_NOOP;
274 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
278 opts->flags |= TCP_OPTS_FLAG_MSS;
279 opts->mss = tcp_main.default_mtu; /*XXX discover that */
280 len += TCP_OPTION_LEN_MSS;
282 opts->flags |= TCP_OPTS_FLAG_WSCALE;
283 opts->wscale = wnd_scale;
284 len += TCP_OPTION_LEN_WINDOW_SCALE;
286 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
287 opts->tsval = tcp_time_now ();
289 len += TCP_OPTION_LEN_TIMESTAMP;
293 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
294 len += TCP_OPTION_LEN_SACK_PERMITTED;
297 /* Align to needed boundary */
298 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
303 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
307 opts->flags |= TCP_OPTS_FLAG_MSS;
309 len += TCP_OPTION_LEN_MSS;
311 if (tcp_opts_wscale (&tc->rcv_opts))
313 opts->flags |= TCP_OPTS_FLAG_WSCALE;
314 opts->wscale = tc->rcv_wscale;
315 len += TCP_OPTION_LEN_WINDOW_SCALE;
318 if (tcp_opts_tstamp (&tc->rcv_opts))
320 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
321 opts->tsval = tcp_time_now ();
322 opts->tsecr = tc->tsval_recent;
323 len += TCP_OPTION_LEN_TIMESTAMP;
326 if (tcp_opts_sack_permitted (&tc->rcv_opts))
328 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
329 len += TCP_OPTION_LEN_SACK_PERMITTED;
332 /* Align to needed boundary */
333 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
338 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
344 if (tcp_opts_tstamp (&tc->rcv_opts))
346 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
347 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
348 opts->tsecr = tc->tsval_recent;
349 len += TCP_OPTION_LEN_TIMESTAMP;
351 if (tcp_opts_sack_permitted (&tc->rcv_opts))
353 if (vec_len (tc->snd_sacks))
355 opts->flags |= TCP_OPTS_FLAG_SACK;
356 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
357 tc->snd_sack_pos = 0;
358 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
359 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
360 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
361 TCP_OPTS_MAX_SACK_BLOCKS);
362 tc->snd_sack_pos += opts->n_sack_blocks;
363 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
367 /* Align to needed boundary */
368 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
373 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
378 case TCP_STATE_ESTABLISHED:
379 case TCP_STATE_CLOSE_WAIT:
380 case TCP_STATE_FIN_WAIT_1:
381 case TCP_STATE_LAST_ACK:
382 case TCP_STATE_CLOSING:
383 case TCP_STATE_FIN_WAIT_2:
384 case TCP_STATE_TIME_WAIT:
385 case TCP_STATE_CLOSED:
386 return tcp_make_established_options (tc, opts);
387 case TCP_STATE_SYN_RCVD:
388 return tcp_make_synack_options (tc, opts);
389 case TCP_STATE_SYN_SENT:
390 return tcp_make_syn_options (opts, tc->rcv_wscale);
392 clib_warning ("State not handled! %d", state);
398 * Update burst send vars
400 * - Updates snd_mss to reflect the effective segment size that we can send
401 * by taking into account all TCP options, including SACKs.
402 * - Cache 'on the wire' options for reuse
403 * - Updates receive window which can be reused for a burst.
405 * This should *only* be called when doing bursts
408 tcp_update_burst_snd_vars (tcp_connection_t * tc)
410 tcp_main_t *tm = &tcp_main;
412 /* Compute options to be used for connection. These may be reused when
413 * sending data or to compute the effective mss (snd_mss) */
414 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
415 TCP_STATE_ESTABLISHED);
417 /* XXX check if MTU has been updated */
418 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
419 ASSERT (tc->snd_mss > 0);
421 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
424 tcp_update_rcv_wnd (tc);
426 if (tc->flags & TCP_CONN_RATE_SAMPLE)
427 tc->flags |= TCP_CONN_TRACK_BURST;
431 tcp_init_mss (tcp_connection_t * tc)
433 u16 default_min_mss = 536;
434 tcp_update_rcv_mss (tc);
436 /* TODO cache mss and consider PMTU discovery */
437 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
439 if (tc->snd_mss < 45)
441 /* Assume that at least the min default mss works */
442 tc->snd_mss = default_min_mss;
443 tc->rcv_opts.mss = default_min_mss;
446 /* We should have enough space for 40 bytes of options */
447 ASSERT (tc->snd_mss > 45);
449 /* If we use timestamp option, account for it */
450 if (tcp_opts_tstamp (&tc->rcv_opts))
451 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
453 #endif /* CLIB_MARCH_VARIANT */
456 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
458 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
459 vlib_buffer_free_one (vm, b->next_buffer);
460 /* Zero all flags but free list index and trace flag */
461 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
463 b->current_length = 0;
464 b->total_length_not_including_first_buffer = 0;
465 vnet_buffer (b)->tcp.flags = 0;
467 /* Leave enough space for headers */
468 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
471 #ifndef CLIB_MARCH_VARIANT
473 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
475 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
476 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
477 b->total_length_not_including_first_buffer = 0;
479 vnet_buffer (b)->tcp.flags = 0;
480 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
481 /* Leave enough space for headers */
482 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
489 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
492 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
493 u8 tcp_opts_len, tcp_hdr_opts_len;
497 wnd = tcp_window_to_advertise (tc, state);
499 /* Make and write options */
500 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
501 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
503 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
504 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
506 tcp_options_write ((u8 *) (th + 1), snd_opts);
507 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
510 tcp_zero_rwnd_sent_on (tc);
512 tcp_zero_rwnd_sent_off (tc);
516 * Convert buffer to ACK
519 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
521 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
522 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
523 tc->rcv_las = tc->rcv_nxt;
527 * Convert buffer to FIN-ACK
530 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
532 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
536 * Convert buffer to SYN
539 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
541 u8 tcp_hdr_opts_len, tcp_opts_len;
544 tcp_options_t snd_opts;
546 initial_wnd = tcp_initial_window_to_advertise (tc);
548 /* Make and write options */
549 clib_memset (&snd_opts, 0, sizeof (snd_opts));
550 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
551 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
553 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
554 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
556 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
557 tcp_options_write ((u8 *) (th + 1), &snd_opts);
561 * Convert buffer to SYN-ACK
564 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
566 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
567 u8 tcp_opts_len, tcp_hdr_opts_len;
571 clib_memset (snd_opts, 0, sizeof (*snd_opts));
572 initial_wnd = tcp_initial_window_to_advertise (tc);
573 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
574 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
576 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
577 tc->rcv_nxt, tcp_hdr_opts_len,
578 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
579 tcp_options_write ((u8 *) (th + 1), snd_opts);
581 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
585 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
586 u8 is_ip4, u32 fib_index, u8 flush)
588 vlib_main_t *vm = wrk->vm;
589 u32 *to_next, next_index;
592 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
595 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
596 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
598 /* Send to IP lookup */
599 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
600 tcp_trajectory_add_start (b, 1);
602 f = wrk->ip_lookup_tx_frames[!is_ip4];
605 f = vlib_get_frame_to_node (vm, next_index);
607 wrk->ip_lookup_tx_frames[!is_ip4] = f;
610 to_next = vlib_frame_vector_args (f);
611 to_next[f->n_vectors] = bi;
613 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
615 vlib_put_frame_to_node (vm, next_index, f);
616 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
621 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
622 u32 bi, u8 is_ip4, u32 fib_index)
624 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
628 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
629 u8 is_ip4, u32 fib_index)
631 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
632 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
633 session_flush_frames_main_thread (wrk->vm);
637 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
640 u32 *to_next, next_index;
643 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
646 /* Decide where to send the packet */
647 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
648 tcp_trajectory_add_start (b, 2);
650 /* Get frame to v4/6 output node */
651 f = wrk->tx_frames[!is_ip4];
654 f = vlib_get_frame_to_node (wrk->vm, next_index);
656 wrk->tx_frames[!is_ip4] = f;
658 to_next = vlib_frame_vector_args (f);
659 to_next[f->n_vectors] = bi;
661 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
663 vlib_put_frame_to_node (wrk->vm, next_index, f);
664 wrk->tx_frames[!is_ip4] = 0;
669 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
672 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
676 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
679 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
681 #endif /* CLIB_MARCH_VARIANT */
684 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
685 tcp_state_t state, u8 thread_index, u8 is_ip4)
690 ip4_address_t src_ip40, dst_ip40;
691 ip6_address_t src_ip60, dst_ip60;
692 u16 src_port, dst_port;
697 /* Find IP and TCP headers */
698 th0 = tcp_buffer_hdr (b0);
700 /* Save src and dst ip */
703 ih4 = vlib_buffer_get_current (b0);
704 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
705 src_ip40.as_u32 = ih4->src_address.as_u32;
706 dst_ip40.as_u32 = ih4->dst_address.as_u32;
710 ih6 = vlib_buffer_get_current (b0);
711 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
712 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
713 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
716 src_port = th0->src_port;
717 dst_port = th0->dst_port;
719 /* Try to determine what/why we're actually resetting */
720 if (state == TCP_STATE_CLOSED)
725 tmp = clib_net_to_host_u32 (th0->seq_number);
727 /* Got a SYN for no listener. */
728 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
729 ack = clib_host_to_net_u32 (tmp + 1);
734 flags = TCP_FLAG_RST;
735 seq = th0->ack_number;
739 tcp_reuse_buffer (vm, b0);
740 tcp_trajectory_add_start (b0, 4);
741 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
742 sizeof (tcp_header_t), flags, 0);
746 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
748 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
753 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
755 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
762 #ifndef CLIB_MARCH_VARIANT
764 * Send reset without reusing existing buffer
766 * It extracts connection info out of original packet
769 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
770 u32 thread_index, u8 is_ip4)
772 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
773 vlib_main_t *vm = wrk->vm;
775 u32 bi, sw_if_index, fib_index;
776 u8 tcp_hdr_len, flags = 0;
777 tcp_header_t *th, *pkt_th;
779 ip4_header_t *ih4, *pkt_ih4;
780 ip6_header_t *ih6, *pkt_ih6;
781 fib_protocol_t fib_proto;
783 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
786 b = vlib_get_buffer (vm, bi);
787 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
788 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
789 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
790 tcp_init_buffer (vm, b);
792 /* Make and write options */
793 tcp_hdr_len = sizeof (tcp_header_t);
797 pkt_ih4 = vlib_buffer_get_current (pkt);
798 pkt_th = ip4_next_header (pkt_ih4);
802 pkt_ih6 = vlib_buffer_get_current (pkt);
803 pkt_th = ip6_next_header (pkt_ih6);
806 if (tcp_ack (pkt_th))
808 flags = TCP_FLAG_RST;
809 seq = pkt_th->ack_number;
810 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
814 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
816 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
819 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
820 seq, ack, tcp_hdr_len, flags, 0);
822 /* Swap src and dst ip */
825 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
826 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
827 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
828 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
833 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
835 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
836 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
837 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
841 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
842 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
846 * Build and set reset packet for connection
849 tcp_send_reset (tcp_connection_t * tc)
851 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
852 vlib_main_t *vm = wrk->vm;
856 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
859 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
861 b = vlib_get_buffer (vm, bi);
862 tcp_init_buffer (vm, b);
864 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
865 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
866 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
867 flags = TCP_FLAG_RST;
868 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
869 tc->rcv_nxt, tcp_hdr_opts_len, flags,
871 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
872 ASSERT (opts_write_len == tc->snd_opts_len);
873 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
877 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
878 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
879 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
885 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
886 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
887 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
890 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
891 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
895 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
898 tcp_header_t *th = vlib_buffer_get_current (b);
899 vlib_main_t *vm = wrk->vm;
903 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
904 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
905 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
912 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
913 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
914 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
922 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
923 * The packet is not forwarded through tcpx_output to avoid doing lookups
924 * in the half_open pool.
927 tcp_send_syn (tcp_connection_t * tc)
929 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
930 vlib_main_t *vm = wrk->vm;
935 * Setup retransmit and establish timers before requesting buffer
936 * such that we can return if we've ran out.
938 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
939 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
940 tc->rto * TCP_TO_TIMER_TICK);
942 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
944 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
948 b = vlib_get_buffer (vm, bi);
949 tcp_init_buffer (vm, b);
950 tcp_make_syn (tc, b);
952 /* Measure RTT with this */
953 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
954 tc->rtt_seq = tc->snd_nxt;
957 tcp_push_ip_hdr (wrk, tc, b);
958 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
959 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
963 tcp_send_synack (tcp_connection_t * tc)
965 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
966 vlib_main_t *vm = wrk->vm;
970 tcp_retransmit_timer_force_update (tc);
972 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
974 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
978 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
979 b = vlib_get_buffer (vm, bi);
980 tcp_init_buffer (vm, b);
981 tcp_make_synack (tc, b);
982 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
983 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
987 * Flush tx frame populated by retransmits and timer pops
990 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
992 if (wrk->tx_frames[!is_ip4])
995 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
996 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
997 wrk->tx_frames[!is_ip4] = 0;
1002 * Flush ip lookup tx frames populated by timer pops
1005 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1007 if (wrk->ip_lookup_tx_frames[!is_ip4])
1010 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1011 vlib_put_frame_to_node (wrk->vm, next_index,
1012 wrk->ip_lookup_tx_frames[!is_ip4]);
1013 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1018 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1021 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1023 tcp_flush_frame_to_output (wrk, 1);
1024 tcp_flush_frame_to_output (wrk, 0);
1025 tcp_flush_frame_to_ip_lookup (wrk, 1);
1026 tcp_flush_frame_to_ip_lookup (wrk, 0);
1033 tcp_send_fin (tcp_connection_t * tc)
1035 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1036 vlib_main_t *vm = wrk->vm;
1041 fin_snt = tc->flags & TCP_CONN_FINSNT;
1045 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1047 /* Out of buffers so program fin retransmit ASAP */
1048 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1052 /* Make sure retransmit retries a fin not data */
1053 tc->flags |= TCP_CONN_FINSNT;
1057 tcp_retransmit_timer_force_update (tc);
1058 b = vlib_get_buffer (vm, bi);
1059 tcp_init_buffer (vm, b);
1060 tcp_make_fin (tc, b);
1061 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1062 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1063 /* Account for the FIN */
1067 tc->flags |= TCP_CONN_FINSNT;
1068 tc->flags &= ~TCP_CONN_FINPNDG;
1069 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1074 * Push TCP header and update connection variables. Should only be called
1075 * for segments with data, not for 'control' packets.
1078 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1079 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1081 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1082 u32 advertise_wnd, data_len;
1083 tcp_main_t *tm = &tcp_main;
1086 data_len = b->current_length;
1087 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1088 data_len += b->total_length_not_including_first_buffer;
1090 vnet_buffer (b)->tcp.flags = 0;
1091 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1094 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1096 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1099 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1101 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1103 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1105 if (seq_geq (tc->psh_seq, snd_nxt)
1106 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1107 flags |= TCP_FLAG_PSH;
1109 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1110 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1115 clib_memcpy_fast ((u8 *) (th + 1),
1116 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1121 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1122 ASSERT (len == tc->snd_opts_len);
1126 * Update connection variables
1130 tc->snd_nxt += data_len;
1131 tc->rcv_las = tc->rcv_nxt;
1133 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1137 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1139 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1141 if (tc->flags & TCP_CONN_TRACK_BURST)
1143 tcp_bt_check_app_limited (tc);
1144 tcp_bt_track_tx (tc);
1145 tc->flags &= ~TCP_CONN_TRACK_BURST;
1148 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1149 /* update_snd_nxt */ 1);
1151 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1152 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1153 /* If not tracking an ACK, start tracking */
1154 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1156 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1157 tc->rtt_seq = tc->snd_nxt;
1159 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1161 tcp_retransmit_timer_set (tc);
1164 tcp_trajectory_add_start (b, 3);
1169 tcp_send_ack (tcp_connection_t * tc)
1171 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1172 vlib_main_t *vm = wrk->vm;
1176 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1178 tcp_update_rcv_wnd (tc);
1181 b = vlib_get_buffer (vm, bi);
1182 tcp_init_buffer (vm, b);
1183 tcp_make_ack (tc, b);
1184 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1188 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1190 if (!(tc->flags & TCP_CONN_SNDACK))
1192 vec_add1 (wrk->pending_acks, tc->c_c_index);
1193 tc->flags |= TCP_CONN_SNDACK;
1198 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1200 if (!(tc->flags & TCP_CONN_SNDACK))
1202 vec_add1 (wrk->pending_acks, tc->c_c_index);
1203 tc->flags |= TCP_CONN_SNDACK;
1205 if (tc->pending_dupacks < 255)
1206 tc->pending_dupacks += 1;
1210 tcp_send_acks (tcp_worker_ctx_t * wrk)
1212 u32 thread_index, *pending_acks;
1213 tcp_connection_t *tc;
1216 if (!vec_len (wrk->pending_acks))
1219 thread_index = wrk->vm->thread_index;
1220 pending_acks = wrk->pending_acks;
1221 for (i = 0; i < vec_len (pending_acks); i++)
1223 tc = tcp_connection_get (pending_acks[i], thread_index);
1224 tc->flags &= ~TCP_CONN_SNDACK;
1225 if (!tc->pending_dupacks)
1231 /* If we're supposed to send dupacks but have no ooo data
1232 * send only one ack */
1233 if (!vec_len (tc->snd_sacks))
1239 /* Start with first sack block */
1240 tc->snd_sack_pos = 0;
1242 /* Generate enough dupacks to cover all sack blocks. Do not generate
1243 * more sacks than the number of packets received. But do generate at
1244 * least 3, i.e., the number needed to signal congestion, if needed. */
1245 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1246 n_acks = clib_min (n_acks, tc->pending_dupacks);
1247 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1248 for (j = 0; j < n_acks; j++)
1251 tc->pending_dupacks = 0;
1252 tc->snd_sack_pos = 0;
1254 _vec_len (wrk->pending_acks) = 0;
1258 * Delayed ack timer handler
1260 * Sends delayed ACK when timer expires
1263 tcp_timer_delack_handler (u32 index)
1265 u32 thread_index = vlib_get_thread_index ();
1266 tcp_connection_t *tc;
1268 tc = tcp_connection_get (index, thread_index);
1269 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1274 * Send Window Update ACK,
1275 * ensuring that it will be sent once, if RWND became non-zero,
1276 * after zero RWND has been advertised in ACK before
1279 tcp_send_window_update_ack (tcp_connection_t * tc)
1281 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1284 if (tcp_zero_rwnd_sent (tc))
1286 win = tcp_window_to_advertise (tc, tc->state);
1289 tcp_zero_rwnd_sent_off (tc);
1290 tcp_program_ack (wrk, tc);
1296 * Allocate a new buffer and build a new tcp segment
1298 * @param wrk tcp worker
1299 * @param tc connection for which the segment will be allocated
1300 * @param offset offset of the first byte in the tx fifo
1301 * @param max_deq_byte segment size
1302 * @param[out] b pointer to buffer allocated
1304 * @return the number of bytes in the segment or 0 if buffer cannot be
1305 * allocated or no data available
1308 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1309 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1311 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1312 vlib_main_t *vm = wrk->vm;
1317 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1322 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1325 * Allocate and fill in buffer(s)
1328 /* Easy case, buffer size greater than mss */
1329 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1331 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1333 *b = vlib_get_buffer (vm, bi);
1334 data = tcp_init_buffer (vm, *b);
1335 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1337 ASSERT (n_bytes == max_deq_bytes);
1338 b[0]->current_length = n_bytes;
1339 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1340 /* burst */ 0, /* update_snd_nxt */ 0);
1342 /* Split mss into multiple buffers */
1345 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1346 u16 n_peeked, len_to_deq;
1347 vlib_buffer_t *chain_b, *prev_b;
1350 /* Make sure we have enough buffers */
1351 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1352 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1353 CLIB_CACHE_LINE_BYTES);
1354 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1355 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1358 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1362 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1363 data = tcp_init_buffer (vm, *b);
1364 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1366 TRANSPORT_MAX_HDRS_LEN);
1367 b[0]->current_length = n_bytes;
1368 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1369 b[0]->total_length_not_including_first_buffer = 0;
1370 max_deq_bytes -= n_bytes;
1373 for (i = 1; i < n_bufs_per_seg; i++)
1376 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1377 chain_bi = wrk->tx_buffers[--n_bufs];
1378 chain_b = vlib_get_buffer (vm, chain_bi);
1379 chain_b->current_data = 0;
1380 data = vlib_buffer_get_current (chain_b);
1381 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1384 ASSERT (n_peeked == len_to_deq);
1385 n_bytes += n_peeked;
1386 chain_b->current_length = n_peeked;
1387 chain_b->next_buffer = 0;
1389 /* update previous buffer */
1390 prev_b->next_buffer = chain_bi;
1391 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1393 max_deq_bytes -= n_peeked;
1394 b[0]->total_length_not_including_first_buffer += n_peeked;
1397 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1398 /* burst */ 0, /* update_snd_nxt */ 0);
1400 if (PREDICT_FALSE (n_bufs))
1402 clib_warning ("not all buffers consumed");
1403 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1407 ASSERT (n_bytes > 0);
1408 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1414 * Build a retransmit segment
1416 * @return the number of bytes in the segment or 0 if there's nothing to
1420 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1421 tcp_connection_t * tc, u32 offset,
1422 u32 max_deq_bytes, vlib_buffer_t ** b)
1424 u32 start, available_bytes;
1427 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1428 ASSERT (max_deq_bytes != 0);
1431 * Make sure we can retransmit something
1433 available_bytes = transport_max_tx_dequeue (&tc->connection);
1434 ASSERT (available_bytes >= offset);
1435 available_bytes -= offset;
1436 if (!available_bytes)
1439 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1440 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1442 /* Start is beyond snd_congestion */
1443 start = tc->snd_una + offset;
1444 if (seq_geq (start, tc->snd_congestion))
1447 /* Don't overshoot snd_congestion */
1448 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1450 max_deq_bytes = tc->snd_congestion - start;
1451 if (max_deq_bytes == 0)
1455 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1459 if (tcp_in_fastrecovery (tc))
1461 tc->snd_rxt_bytes += n_bytes;
1462 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1463 tcp_bt_track_rxt (tc, start, start + n_bytes);
1467 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1472 * Reset congestion control, switch cwnd to loss window and try again.
1475 tcp_cc_init_rxt_timeout (tcp_connection_t * tc)
1477 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1478 tc->prev_ssthresh = tc->ssthresh;
1479 tc->prev_cwnd = tc->cwnd;
1481 /* Clear fast recovery state if needed */
1482 if (tcp_in_fastrecovery (tc))
1483 tcp_cc_fastrecovery_clear (tc);
1485 /* Let cc algo decide loss cwnd and ssthresh */
1488 /* Start again from the beginning */
1489 tc->snd_congestion = tc->snd_nxt;
1490 tc->rcv_dupacks = 0;
1492 tc->cwnd_acc_bytes = 0;
1493 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1494 tcp_recovery_on (tc);
1498 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1500 u32 thread_index = vlib_get_thread_index ();
1501 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1502 vlib_main_t *vm = wrk->vm;
1503 tcp_connection_t *tc;
1504 vlib_buffer_t *b = 0;
1509 tc = tcp_half_open_connection_get (index);
1510 /* Note: the connection may have transitioned to ESTABLISHED... */
1511 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1513 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1517 tc = tcp_connection_get (index, thread_index);
1518 /* Note: the connection may have been closed and pool_put */
1519 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1521 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1522 /* Wait-close and retransmit could pop at the same time */
1523 if (tc->state == TCP_STATE_CLOSED)
1527 if (tc->state >= TCP_STATE_ESTABLISHED)
1529 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1531 /* Lost FIN, retransmit and return */
1532 if (tc->flags & TCP_CONN_FINSNT)
1536 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1540 /* Shouldn't be here. This condition is tricky because it has to take
1541 * into account boff > 0 due to persist timeout. */
1542 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1543 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1544 && !tcp_flight_size (tc)))
1546 ASSERT (!tcp_in_recovery (tc));
1551 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1552 * to persist timer timeout */
1553 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1556 tcp_update_rto (tc);
1559 /* Peer is dead or network connectivity is lost. Close connection.
1560 * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For
1561 * a min rto of 0.2s we need to retry about 8 times. */
1562 if (tc->rto_boff >= TCP_RTO_BOFF_MAX)
1564 tcp_send_reset (tc);
1565 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1566 session_transport_closing_notify (&tc->connection);
1567 tcp_connection_timers_reset (tc);
1568 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
1572 /* Increment RTO backoff (also equal to number of retries) and go back
1573 * to first un-acked byte */
1576 /* TODO be less aggressive about clearing scoreboard */
1577 scoreboard_clear (&tc->sack_sb);
1579 /* First retransmit timeout */
1580 if (tc->rto_boff == 1)
1581 tcp_cc_init_rxt_timeout (tc);
1583 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1584 tcp_bt_flush_samples (tc);
1586 /* If we've sent beyond snd_congestion, update it */
1587 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1589 tc->snd_nxt = tc->snd_una;
1590 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1592 /* Send one segment. Note that n_bytes may be zero due to buffer
1594 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1597 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1601 bi = vlib_get_buffer_index (vm, b);
1603 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1604 if (tc->rto_boff == 1)
1605 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1607 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1608 tcp_retransmit_timer_force_update (tc);
1610 /* Retransmit for SYN */
1611 else if (tc->state == TCP_STATE_SYN_SENT)
1613 /* Half-open connection actually moved to established but we were
1614 * waiting for syn retransmit to pop to call cleanup from the right
1616 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1618 if (tcp_half_open_connection_cleanup (tc))
1619 TCP_DBG ("could not remove half-open connection");
1623 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1625 /* Try without increasing RTO a number of times. If this fails,
1626 * start growing RTO exponentially */
1628 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1629 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1631 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1632 tc->rto * TCP_TO_TIMER_TICK);
1634 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1636 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1640 b = vlib_get_buffer (vm, bi);
1641 tcp_init_buffer (vm, b);
1642 tcp_make_syn (tc, b);
1645 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1647 /* This goes straight to ipx_lookup. Retransmit timer set already */
1648 tcp_push_ip_hdr (wrk, tc, b);
1649 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1651 /* Retransmit SYN-ACK */
1652 else if (tc->state == TCP_STATE_SYN_RCVD)
1654 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1657 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1658 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1661 tcp_retransmit_timer_force_update (tc);
1663 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1665 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1669 b = vlib_get_buffer (vm, bi);
1670 tcp_init_buffer (vm, b);
1671 tcp_make_synack (tc, b);
1672 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1674 /* Retransmit timer already updated, just enqueue to output */
1675 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1679 ASSERT (tc->state == TCP_STATE_CLOSED);
1685 tcp_timer_retransmit_handler (u32 index)
1687 tcp_timer_retransmit_handler_i (index, 0);
1691 tcp_timer_retransmit_syn_handler (u32 index)
1693 tcp_timer_retransmit_handler_i (index, 1);
1697 * Got 0 snd_wnd from peer, try to do something about it.
1701 tcp_timer_persist_handler (u32 index)
1703 u32 thread_index = vlib_get_thread_index ();
1704 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1705 u32 bi, max_snd_bytes, available_bytes, offset;
1706 tcp_main_t *tm = vnet_get_tcp_main ();
1707 vlib_main_t *vm = wrk->vm;
1708 tcp_connection_t *tc;
1713 tc = tcp_connection_get_if_valid (index, thread_index);
1717 /* Make sure timer handle is set to invalid */
1718 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1720 /* Problem already solved or worse */
1721 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1722 || (tc->flags & TCP_CONN_FINSNT))
1725 available_bytes = transport_max_tx_dequeue (&tc->connection);
1726 offset = tc->snd_nxt - tc->snd_una;
1728 /* Reprogram persist if no new bytes available to send. We may have data
1730 if (!available_bytes)
1732 tcp_persist_timer_set (tc);
1736 if (available_bytes <= offset)
1738 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1742 /* Increment RTO backoff */
1744 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1747 * Try to force the first unsent segment (or buffer)
1749 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1751 tcp_persist_timer_set (tc);
1754 b = vlib_get_buffer (vm, bi);
1755 data = tcp_init_buffer (vm, b);
1757 tcp_validate_txf_size (tc, offset);
1758 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1759 max_snd_bytes = clib_min (tc->snd_mss,
1760 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1761 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1763 b->current_length = n_bytes;
1764 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1765 || tc->snd_nxt == tc->snd_una_max
1766 || tc->rto_boff > 1));
1768 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1769 /* burst */ 0, /* update_snd_nxt */ 1);
1770 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1771 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1772 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1774 /* Just sent new data, enable retransmit */
1775 tcp_retransmit_timer_update (tc);
1779 * Retransmit first unacked segment
1782 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1784 vlib_main_t *vm = wrk->vm;
1788 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1790 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1794 bi = vlib_get_buffer_index (vm, b);
1795 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1801 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1804 u32 offset, n_segs = 0, n_written, bi;
1805 vlib_main_t *vm = wrk->vm;
1806 vlib_buffer_t *b = 0;
1808 offset = tc->snd_nxt - tc->snd_una;
1809 while (n_segs < burst_size)
1811 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1815 bi = vlib_get_buffer_index (vm, b);
1816 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1817 offset += n_written;
1820 tc->snd_nxt += n_written;
1821 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1828 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1829 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1830 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1833 * Do fast retransmit with SACKs
1836 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1839 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1840 sack_scoreboard_hole_t *hole;
1841 vlib_main_t *vm = wrk->vm;
1842 vlib_buffer_t *b = 0;
1843 sack_scoreboard_t *sb;
1846 u8 snd_limited = 0, can_rescue = 0;
1848 ASSERT (tcp_in_fastrecovery (tc));
1850 snd_space = tcp_available_cc_snd_space (tc);
1851 if (snd_space < tc->snd_mss)
1853 tcp_program_fastretransmit (wrk, tc);
1857 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1859 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1861 max_deq = transport_max_tx_dequeue (&tc->connection);
1862 max_deq -= tc->snd_nxt - tc->snd_una;
1864 while (snd_space > 0 && n_segs < burst_size)
1866 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1872 snd_space = clib_min (max_deq, snd_space);
1873 burst_size = clib_min (burst_size - n_segs,
1874 snd_space / tc->snd_mss);
1875 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1876 if (max_deq > n_segs_now * tc->snd_mss)
1877 tcp_program_fastretransmit (wrk, tc);
1878 n_segs += n_segs_now;
1882 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1885 /* If rescue rxt undefined or less than snd_una then one segment of
1886 * up to SMSS octets that MUST include the highest outstanding
1887 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1888 * RecoveryPoint. HighRxt MUST NOT be updated.
1890 max_bytes = clib_min (tc->snd_mss,
1891 tc->snd_congestion - tc->snd_una);
1892 max_bytes = clib_min (max_bytes, snd_space);
1893 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1894 sb->rescue_rxt = tc->snd_congestion;
1895 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1900 bi = vlib_get_buffer_index (vm, b);
1901 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1906 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1907 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1911 offset = sb->high_rxt - tc->snd_una;
1912 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1914 ASSERT (n_written <= snd_space);
1916 /* Nothing left to retransmit */
1920 bi = vlib_get_buffer_index (vm, b);
1921 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1923 sb->high_rxt += n_written;
1924 snd_space -= n_written;
1929 tcp_program_fastretransmit (wrk, tc);
1936 * Fast retransmit without SACK info
1939 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1942 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1943 vlib_main_t *vm = wrk->vm;
1944 int snd_space, n_segs = 0;
1947 ASSERT (tcp_in_fastrecovery (tc));
1948 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1950 snd_space = tcp_available_cc_snd_space (tc);
1952 if (!tcp_fastrecovery_first (tc))
1955 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1957 while (snd_space > 0 && n_segs < burst_size)
1959 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1962 /* Nothing left to retransmit */
1966 bi = vlib_get_buffer_index (vm, b);
1967 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1968 snd_space -= n_written;
1969 offset += n_written;
1973 if (n_segs == burst_size)
1978 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1979 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1982 max_deq = transport_max_tx_dequeue (&tc->connection);
1983 max_deq -= tc->snd_nxt - tc->snd_una;
1986 snd_space = clib_min (max_deq, snd_space);
1987 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1988 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1989 if (max_deq > n_segs_now * tc->snd_mss)
1990 tcp_program_fastretransmit (wrk, tc);
1991 n_segs += n_segs_now;
1995 tcp_fastrecovery_first_off (tc);
2000 * Do fast retransmit
2003 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2006 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2007 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2009 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2011 #endif /* CLIB_MARCH_VARIANT */
2014 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2015 u16 * next0, u32 * error0)
2017 ip_adjacency_t *adj;
2020 /* Not thread safe but as long as the connection exists the adj should
2022 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2024 if (ai == ADJ_INDEX_INVALID)
2026 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2027 *next0 = TCP_OUTPUT_NEXT_DROP;
2028 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2033 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2034 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2035 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2036 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2039 *next0 = TCP_OUTPUT_NEXT_DROP;
2040 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2042 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2046 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2047 u32 * to_next, u32 n_bufs)
2049 u32 n_trace = vlib_get_trace_count (vm, node);
2050 tcp_connection_t *tc;
2056 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2058 b = vlib_get_buffer (vm, to_next[i]);
2059 th = vlib_buffer_get_current (b);
2060 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2062 t = vlib_add_trace (vm, node, b, sizeof (*t));
2063 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2064 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2069 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2070 tcp_connection_t * tc0, u8 is_ip4)
2072 tcp_header_t *th0 = 0;
2074 th0 = vlib_buffer_get_current (b0);
2075 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2078 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2079 IP_PROTOCOL_TCP, 1);
2080 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2081 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2087 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2088 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2089 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2090 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2091 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2097 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2098 u32 * error0, u16 * next0, u8 is_ip4)
2101 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2103 *error0 = TCP_ERROR_INVALID_CONNECTION;
2104 *next0 = TCP_OUTPUT_NEXT_DROP;
2108 /* If next_index is not drop use it */
2109 if (tc0->next_node_index)
2111 *next0 = tc0->next_node_index;
2112 vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
2115 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2116 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2120 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2121 tcp_output_handle_link_local (tc0, b0, next0, error0);
2124 if (!TCP_ALWAYS_ACK)
2125 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2129 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2130 vlib_frame_t * frame, int is_ip4)
2132 u32 n_left_from, *from, thread_index = vm->thread_index;
2133 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2134 u16 nexts[VLIB_FRAME_SIZE], *next;
2136 from = vlib_frame_vector_args (frame);
2137 n_left_from = frame->n_vectors;
2138 tcp_set_time_now (tcp_get_worker (thread_index));
2140 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2141 tcp46_output_trace_frame (vm, node, from, n_left_from);
2143 vlib_get_buffers (vm, from, bufs, n_left_from);
2147 while (n_left_from >= 4)
2149 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2150 tcp_connection_t *tc0, *tc1;
2153 vlib_prefetch_buffer_header (b[2], STORE);
2154 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2156 vlib_prefetch_buffer_header (b[3], STORE);
2157 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2160 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2162 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2164 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2167 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2168 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2170 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2171 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2177 while (n_left_from > 0)
2179 u32 error0 = TCP_ERROR_PKTS_SENT;
2180 tcp_connection_t *tc0;
2182 if (n_left_from > 1)
2184 vlib_prefetch_buffer_header (b[1], STORE);
2185 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2188 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2189 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2192 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2193 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2200 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2201 return frame->n_vectors;
2204 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2205 vlib_frame_t * from_frame)
2207 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2210 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2211 vlib_frame_t * from_frame)
2213 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2217 VLIB_REGISTER_NODE (tcp4_output_node) =
2219 .name = "tcp4-output",
2220 /* Takes a vector of packets. */
2221 .vector_size = sizeof (u32),
2222 .n_errors = TCP_N_ERROR,
2223 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2224 .error_strings = tcp_error_strings,
2225 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2227 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2228 foreach_tcp4_output_next
2231 .format_buffer = format_tcp_header,
2232 .format_trace = format_tcp_tx_trace,
2237 VLIB_REGISTER_NODE (tcp6_output_node) =
2239 .name = "tcp6-output",
2240 /* Takes a vector of packets. */
2241 .vector_size = sizeof (u32),
2242 .n_errors = TCP_N_ERROR,
2243 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2244 .error_strings = tcp_error_strings,
2245 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2247 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2248 foreach_tcp6_output_next
2251 .format_buffer = format_tcp_header,
2252 .format_trace = format_tcp_tx_trace,
2256 typedef enum _tcp_reset_next
2258 TCP_RESET_NEXT_DROP,
2259 TCP_RESET_NEXT_IP_LOOKUP,
2263 #define foreach_tcp4_reset_next \
2264 _(DROP, "error-drop") \
2265 _(IP_LOOKUP, "ip4-lookup")
2267 #define foreach_tcp6_reset_next \
2268 _(DROP, "error-drop") \
2269 _(IP_LOOKUP, "ip6-lookup")
2272 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2273 vlib_frame_t * from_frame, u8 is_ip4)
2275 u32 n_left_from, next_index, *from, *to_next;
2276 u32 my_thread_index = vm->thread_index;
2278 from = vlib_frame_vector_args (from_frame);
2279 n_left_from = from_frame->n_vectors;
2281 next_index = node->cached_next_index;
2283 while (n_left_from > 0)
2287 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2289 while (n_left_from > 0 && n_left_to_next > 0)
2295 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2302 n_left_to_next -= 1;
2304 b0 = vlib_get_buffer (vm, bi0);
2306 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2307 my_thread_index, is_ip4))
2309 error0 = TCP_ERROR_LOOKUP_DROPS;
2310 next0 = TCP_RESET_NEXT_DROP;
2314 /* Prepare to send to IP lookup */
2315 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2316 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2319 b0->error = node->errors[error0];
2320 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2321 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2323 th0 = vlib_buffer_get_current (b0);
2325 th0 = ip4_next_header ((ip4_header_t *) th0);
2327 th0 = ip6_next_header ((ip6_header_t *) th0);
2328 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2329 clib_memcpy_fast (&t0->tcp_header, th0,
2330 sizeof (t0->tcp_header));
2333 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2334 n_left_to_next, bi0, next0);
2336 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2338 return from_frame->n_vectors;
2341 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2342 vlib_frame_t * from_frame)
2344 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2347 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2348 vlib_frame_t * from_frame)
2350 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2354 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2355 .name = "tcp4-reset",
2356 .vector_size = sizeof (u32),
2357 .n_errors = TCP_N_ERROR,
2358 .error_strings = tcp_error_strings,
2359 .n_next_nodes = TCP_RESET_N_NEXT,
2361 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2362 foreach_tcp4_reset_next
2365 .format_trace = format_tcp_tx_trace,
2370 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2371 .name = "tcp6-reset",
2372 .vector_size = sizeof (u32),
2373 .n_errors = TCP_N_ERROR,
2374 .error_strings = tcp_error_strings,
2375 .n_next_nodes = TCP_RESET_N_NEXT,
2377 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2378 foreach_tcp6_reset_next
2381 .format_trace = format_tcp_tx_trace,
2386 * fd.io coding-style-patch-verification: ON
2389 * eval: (c-set-style "gnu")