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);
428 tcp_init_mss (tcp_connection_t * tc)
430 u16 default_min_mss = 536;
431 tcp_update_rcv_mss (tc);
433 /* TODO cache mss and consider PMTU discovery */
434 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
436 if (tc->snd_mss < 45)
438 /* Assume that at least the min default mss works */
439 tc->snd_mss = default_min_mss;
440 tc->rcv_opts.mss = default_min_mss;
443 /* We should have enough space for 40 bytes of options */
444 ASSERT (tc->snd_mss > 45);
446 /* If we use timestamp option, account for it */
447 if (tcp_opts_tstamp (&tc->rcv_opts))
448 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
450 #endif /* CLIB_MARCH_VARIANT */
453 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
455 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
456 vlib_buffer_free_one (vm, b->next_buffer);
457 /* Zero all flags but free list index and trace flag */
458 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
460 b->current_length = 0;
461 b->total_length_not_including_first_buffer = 0;
462 vnet_buffer (b)->tcp.flags = 0;
464 /* Leave enough space for headers */
465 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
468 #ifndef CLIB_MARCH_VARIANT
470 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
472 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
473 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
474 b->total_length_not_including_first_buffer = 0;
476 vnet_buffer (b)->tcp.flags = 0;
477 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
478 /* Leave enough space for headers */
479 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
486 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
489 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
490 u8 tcp_opts_len, tcp_hdr_opts_len;
494 wnd = tcp_window_to_advertise (tc, state);
496 /* Make and write options */
497 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
498 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
500 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
501 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
503 tcp_options_write ((u8 *) (th + 1), snd_opts);
504 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
508 * Convert buffer to ACK
511 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
513 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
514 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
515 tc->rcv_las = tc->rcv_nxt;
519 * Convert buffer to FIN-ACK
522 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
524 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
528 * Convert buffer to SYN
531 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
533 u8 tcp_hdr_opts_len, tcp_opts_len;
536 tcp_options_t snd_opts;
538 initial_wnd = tcp_initial_window_to_advertise (tc);
540 /* Make and write options */
541 clib_memset (&snd_opts, 0, sizeof (snd_opts));
542 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
543 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
545 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
546 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
548 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
549 tcp_options_write ((u8 *) (th + 1), &snd_opts);
553 * Convert buffer to SYN-ACK
556 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
558 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
559 u8 tcp_opts_len, tcp_hdr_opts_len;
563 clib_memset (snd_opts, 0, sizeof (*snd_opts));
564 initial_wnd = tcp_initial_window_to_advertise (tc);
565 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
566 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
568 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
569 tc->rcv_nxt, tcp_hdr_opts_len,
570 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
571 tcp_options_write ((u8 *) (th + 1), snd_opts);
573 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
577 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
578 u8 is_ip4, u32 fib_index, u8 flush)
580 vlib_main_t *vm = wrk->vm;
581 u32 *to_next, next_index;
584 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
587 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
588 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
590 /* Send to IP lookup */
591 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
592 tcp_trajectory_add_start (b, 1);
594 f = wrk->ip_lookup_tx_frames[!is_ip4];
597 f = vlib_get_frame_to_node (vm, next_index);
599 wrk->ip_lookup_tx_frames[!is_ip4] = f;
602 to_next = vlib_frame_vector_args (f);
603 to_next[f->n_vectors] = bi;
605 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
607 vlib_put_frame_to_node (vm, next_index, f);
608 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
613 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
614 u32 bi, u8 is_ip4, u32 fib_index)
616 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
620 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
621 u8 is_ip4, u32 fib_index)
623 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
624 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
625 session_flush_frames_main_thread (wrk->vm);
629 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
632 u32 *to_next, next_index;
635 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
638 /* Decide where to send the packet */
639 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
640 tcp_trajectory_add_start (b, 2);
642 /* Get frame to v4/6 output node */
643 f = wrk->tx_frames[!is_ip4];
646 f = vlib_get_frame_to_node (wrk->vm, next_index);
648 wrk->tx_frames[!is_ip4] = f;
650 to_next = vlib_frame_vector_args (f);
651 to_next[f->n_vectors] = bi;
653 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
655 vlib_put_frame_to_node (wrk->vm, next_index, f);
656 wrk->tx_frames[!is_ip4] = 0;
661 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
664 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
668 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
671 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
673 #endif /* CLIB_MARCH_VARIANT */
676 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
677 tcp_state_t state, u8 thread_index, u8 is_ip4)
682 ip4_address_t src_ip40, dst_ip40;
683 ip6_address_t src_ip60, dst_ip60;
684 u16 src_port, dst_port;
689 /* Find IP and TCP headers */
690 th0 = tcp_buffer_hdr (b0);
692 /* Save src and dst ip */
695 ih4 = vlib_buffer_get_current (b0);
696 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
697 src_ip40.as_u32 = ih4->src_address.as_u32;
698 dst_ip40.as_u32 = ih4->dst_address.as_u32;
702 ih6 = vlib_buffer_get_current (b0);
703 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
704 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
705 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
708 src_port = th0->src_port;
709 dst_port = th0->dst_port;
711 /* Try to determine what/why we're actually resetting */
712 if (state == TCP_STATE_CLOSED)
717 tmp = clib_net_to_host_u32 (th0->seq_number);
719 /* Got a SYN for no listener. */
720 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
721 ack = clib_host_to_net_u32 (tmp + 1);
726 flags = TCP_FLAG_RST;
727 seq = th0->ack_number;
731 tcp_reuse_buffer (vm, b0);
732 tcp_trajectory_add_start (b0, 4);
733 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
734 sizeof (tcp_header_t), flags, 0);
738 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
740 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
745 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
747 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
754 #ifndef CLIB_MARCH_VARIANT
756 * Send reset without reusing existing buffer
758 * It extracts connection info out of original packet
761 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
762 u32 thread_index, u8 is_ip4)
764 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
765 vlib_main_t *vm = wrk->vm;
767 u32 bi, sw_if_index, fib_index;
768 u8 tcp_hdr_len, flags = 0;
769 tcp_header_t *th, *pkt_th;
771 ip4_header_t *ih4, *pkt_ih4;
772 ip6_header_t *ih6, *pkt_ih6;
773 fib_protocol_t fib_proto;
775 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
778 b = vlib_get_buffer (vm, bi);
779 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
780 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
781 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
782 tcp_init_buffer (vm, b);
784 /* Make and write options */
785 tcp_hdr_len = sizeof (tcp_header_t);
789 pkt_ih4 = vlib_buffer_get_current (pkt);
790 pkt_th = ip4_next_header (pkt_ih4);
794 pkt_ih6 = vlib_buffer_get_current (pkt);
795 pkt_th = ip6_next_header (pkt_ih6);
798 if (tcp_ack (pkt_th))
800 flags = TCP_FLAG_RST;
801 seq = pkt_th->ack_number;
802 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
806 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
808 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
811 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
812 seq, ack, tcp_hdr_len, flags, 0);
814 /* Swap src and dst ip */
817 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
818 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
819 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
820 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
825 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
827 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
828 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
829 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
833 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
834 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
838 * Build and set reset packet for connection
841 tcp_send_reset (tcp_connection_t * tc)
843 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
844 vlib_main_t *vm = wrk->vm;
848 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
851 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
853 b = vlib_get_buffer (vm, bi);
854 tcp_init_buffer (vm, b);
856 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
857 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
858 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
859 flags = TCP_FLAG_RST;
860 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
861 tc->rcv_nxt, tcp_hdr_opts_len, flags,
863 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
864 ASSERT (opts_write_len == tc->snd_opts_len);
865 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
869 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
870 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
871 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
877 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
878 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
879 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
882 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
883 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
887 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
890 tcp_header_t *th = vlib_buffer_get_current (b);
891 vlib_main_t *vm = wrk->vm;
895 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
896 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
897 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
904 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
905 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
906 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
914 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
915 * The packet is not forwarded through tcpx_output to avoid doing lookups
916 * in the half_open pool.
919 tcp_send_syn (tcp_connection_t * tc)
921 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
922 vlib_main_t *vm = wrk->vm;
927 * Setup retransmit and establish timers before requesting buffer
928 * such that we can return if we've ran out.
930 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
931 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
932 tc->rto * TCP_TO_TIMER_TICK);
934 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
936 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
940 b = vlib_get_buffer (vm, bi);
941 tcp_init_buffer (vm, b);
942 tcp_make_syn (tc, b);
944 /* Measure RTT with this */
945 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
946 tc->rtt_seq = tc->snd_nxt;
949 tcp_push_ip_hdr (wrk, tc, b);
950 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
951 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
955 tcp_send_synack (tcp_connection_t * tc)
957 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
958 vlib_main_t *vm = wrk->vm;
962 tcp_retransmit_timer_force_update (tc);
964 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
966 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
970 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
971 b = vlib_get_buffer (vm, bi);
972 tcp_init_buffer (vm, b);
973 tcp_make_synack (tc, b);
974 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
975 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
979 * Flush tx frame populated by retransmits and timer pops
982 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
984 if (wrk->tx_frames[!is_ip4])
987 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
988 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
989 wrk->tx_frames[!is_ip4] = 0;
994 * Flush ip lookup tx frames populated by timer pops
997 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
999 if (wrk->ip_lookup_tx_frames[!is_ip4])
1002 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1003 vlib_put_frame_to_node (wrk->vm, next_index,
1004 wrk->ip_lookup_tx_frames[!is_ip4]);
1005 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1010 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1013 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1015 tcp_flush_frame_to_output (wrk, 1);
1016 tcp_flush_frame_to_output (wrk, 0);
1017 tcp_flush_frame_to_ip_lookup (wrk, 1);
1018 tcp_flush_frame_to_ip_lookup (wrk, 0);
1025 tcp_send_fin (tcp_connection_t * tc)
1027 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1028 vlib_main_t *vm = wrk->vm;
1033 fin_snt = tc->flags & TCP_CONN_FINSNT;
1037 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1039 /* Out of buffers so program fin retransmit ASAP */
1040 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1044 /* Make sure retransmit retries a fin not data */
1045 tc->flags |= TCP_CONN_FINSNT;
1049 tcp_retransmit_timer_force_update (tc);
1050 b = vlib_get_buffer (vm, bi);
1051 tcp_init_buffer (vm, b);
1052 tcp_make_fin (tc, b);
1053 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1054 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1055 /* Account for the FIN */
1059 tc->flags |= TCP_CONN_FINSNT;
1060 tc->flags &= ~TCP_CONN_FINPNDG;
1061 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1066 * Push TCP header and update connection variables. Should only be called
1067 * for segments with data, not for 'control' packets.
1070 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1071 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1073 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1074 u32 advertise_wnd, data_len;
1075 tcp_main_t *tm = &tcp_main;
1078 data_len = b->current_length;
1079 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1080 data_len += b->total_length_not_including_first_buffer;
1082 vnet_buffer (b)->tcp.flags = 0;
1083 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1086 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1088 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1091 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1093 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1095 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1097 if (seq_geq (tc->psh_seq, snd_nxt)
1098 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1099 flags |= TCP_FLAG_PSH;
1101 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1102 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1107 clib_memcpy_fast ((u8 *) (th + 1),
1108 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1113 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1114 ASSERT (len == tc->snd_opts_len);
1118 * Update connection variables
1122 tc->snd_nxt += data_len;
1123 tc->rcv_las = tc->rcv_nxt;
1125 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1129 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1131 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1132 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1133 /* update_snd_nxt */ 1);
1134 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1135 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1136 /* If not tracking an ACK, start tracking */
1137 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1139 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1140 tc->rtt_seq = tc->snd_nxt;
1142 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1144 tcp_retransmit_timer_set (tc);
1147 tcp_trajectory_add_start (b, 3);
1152 tcp_send_ack (tcp_connection_t * tc)
1154 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1155 vlib_main_t *vm = wrk->vm;
1159 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1161 tcp_update_rcv_wnd (tc);
1164 b = vlib_get_buffer (vm, bi);
1165 tcp_init_buffer (vm, b);
1166 tcp_make_ack (tc, b);
1167 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1171 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1173 if (!(tc->flags & TCP_CONN_SNDACK))
1175 vec_add1 (wrk->pending_acks, tc->c_c_index);
1176 tc->flags |= TCP_CONN_SNDACK;
1181 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1183 if (!(tc->flags & TCP_CONN_SNDACK))
1185 vec_add1 (wrk->pending_acks, tc->c_c_index);
1186 tc->flags |= TCP_CONN_SNDACK;
1188 if (tc->pending_dupacks < 255)
1189 tc->pending_dupacks += 1;
1193 tcp_send_acks (tcp_worker_ctx_t * wrk)
1195 u32 thread_index, *pending_acks;
1196 tcp_connection_t *tc;
1199 if (!vec_len (wrk->pending_acks))
1202 thread_index = wrk->vm->thread_index;
1203 pending_acks = wrk->pending_acks;
1204 for (i = 0; i < vec_len (pending_acks); i++)
1206 tc = tcp_connection_get (pending_acks[i], thread_index);
1207 tc->flags &= ~TCP_CONN_SNDACK;
1208 if (!tc->pending_dupacks)
1214 /* If we're supposed to send dupacks but have no ooo data
1215 * send only one ack */
1216 if (!vec_len (tc->snd_sacks))
1222 /* Start with first sack block */
1223 tc->snd_sack_pos = 0;
1225 /* Generate enough dupacks to cover all sack blocks. Do not generate
1226 * more sacks than the number of packets received. But do generate at
1227 * least 3, i.e., the number needed to signal congestion, if needed. */
1228 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1229 n_acks = clib_min (n_acks, tc->pending_dupacks);
1230 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1231 for (j = 0; j < n_acks; j++)
1234 tc->pending_dupacks = 0;
1235 tc->snd_sack_pos = 0;
1237 _vec_len (wrk->pending_acks) = 0;
1241 * Delayed ack timer handler
1243 * Sends delayed ACK when timer expires
1246 tcp_timer_delack_handler (u32 index)
1248 u32 thread_index = vlib_get_thread_index ();
1249 tcp_connection_t *tc;
1251 tc = tcp_connection_get (index, thread_index);
1252 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1257 * Allocate a new buffer and build a new tcp segment
1259 * @param wrk tcp worker
1260 * @param tc connection for which the segment will be allocated
1261 * @param offset offset of the first byte in the tx fifo
1262 * @param max_deq_byte segment size
1263 * @param[out] b pointer to buffer allocated
1265 * @return the number of bytes in the segment or 0 if buffer cannot be
1266 * allocated or no data available
1269 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1270 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1272 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1273 vlib_main_t *vm = wrk->vm;
1278 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1283 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1286 * Allocate and fill in buffer(s)
1289 /* Easy case, buffer size greater than mss */
1290 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1292 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1294 *b = vlib_get_buffer (vm, bi);
1295 data = tcp_init_buffer (vm, *b);
1296 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1298 ASSERT (n_bytes == max_deq_bytes);
1299 b[0]->current_length = n_bytes;
1300 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1301 /* burst */ 0, /* update_snd_nxt */ 0);
1303 /* Split mss into multiple buffers */
1306 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1307 u16 n_peeked, len_to_deq;
1308 vlib_buffer_t *chain_b, *prev_b;
1311 /* Make sure we have enough buffers */
1312 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1313 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1314 CLIB_CACHE_LINE_BYTES);
1315 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1316 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1319 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1323 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1324 data = tcp_init_buffer (vm, *b);
1325 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1327 TRANSPORT_MAX_HDRS_LEN);
1328 b[0]->current_length = n_bytes;
1329 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1330 b[0]->total_length_not_including_first_buffer = 0;
1331 max_deq_bytes -= n_bytes;
1334 for (i = 1; i < n_bufs_per_seg; i++)
1337 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1338 chain_bi = wrk->tx_buffers[--n_bufs];
1339 chain_b = vlib_get_buffer (vm, chain_bi);
1340 chain_b->current_data = 0;
1341 data = vlib_buffer_get_current (chain_b);
1342 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1345 ASSERT (n_peeked == len_to_deq);
1346 n_bytes += n_peeked;
1347 chain_b->current_length = n_peeked;
1348 chain_b->next_buffer = 0;
1350 /* update previous buffer */
1351 prev_b->next_buffer = chain_bi;
1352 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1354 max_deq_bytes -= n_peeked;
1355 b[0]->total_length_not_including_first_buffer += n_peeked;
1358 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1359 /* burst */ 0, /* update_snd_nxt */ 0);
1361 if (PREDICT_FALSE (n_bufs))
1363 clib_warning ("not all buffers consumed");
1364 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1368 ASSERT (n_bytes > 0);
1369 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1375 * Build a retransmit segment
1377 * @return the number of bytes in the segment or 0 if there's nothing to
1381 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1382 tcp_connection_t * tc, u32 offset,
1383 u32 max_deq_bytes, vlib_buffer_t ** b)
1385 u32 start, available_bytes;
1388 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1389 ASSERT (max_deq_bytes != 0);
1392 * Make sure we can retransmit something
1394 available_bytes = transport_max_tx_dequeue (&tc->connection);
1395 ASSERT (available_bytes >= offset);
1396 available_bytes -= offset;
1397 if (!available_bytes)
1400 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1401 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1403 /* Start is beyond snd_congestion */
1404 start = tc->snd_una + offset;
1405 if (seq_geq (start, tc->snd_congestion))
1408 /* Don't overshoot snd_congestion */
1409 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1411 max_deq_bytes = tc->snd_congestion - start;
1412 if (max_deq_bytes == 0)
1416 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1420 if (tcp_in_fastrecovery (tc))
1421 tc->snd_rxt_bytes += n_bytes;
1424 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1429 * Reset congestion control, switch cwnd to loss window and try again.
1432 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1434 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1435 tc->prev_ssthresh = tc->ssthresh;
1436 tc->prev_cwnd = tc->cwnd;
1438 /* Cleanly recover cc (also clears up fast retransmit) */
1439 if (tcp_in_fastrecovery (tc))
1441 /* TODO be less aggressive about this */
1442 scoreboard_clear (&tc->sack_sb);
1443 tcp_cc_fastrecovery_exit (tc);
1446 tc->rcv_dupacks = 0;
1448 /* Start again from the beginning */
1449 tc->cc_algo->congestion (tc);
1450 tc->cwnd = tcp_loss_wnd (tc);
1451 tc->snd_congestion = tc->snd_nxt;
1453 tc->cwnd_acc_bytes = 0;
1454 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1455 tcp_recovery_on (tc);
1459 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1461 u32 thread_index = vlib_get_thread_index ();
1462 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1463 vlib_main_t *vm = wrk->vm;
1464 tcp_connection_t *tc;
1465 vlib_buffer_t *b = 0;
1470 tc = tcp_half_open_connection_get (index);
1471 /* Note: the connection may have transitioned to ESTABLISHED... */
1472 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1474 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1478 tc = tcp_connection_get (index, thread_index);
1479 /* Note: the connection may have been closed and pool_put */
1480 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1482 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1483 /* Wait-close and retransmit could pop at the same time */
1484 if (tc->state == TCP_STATE_CLOSED)
1488 if (tc->state >= TCP_STATE_ESTABLISHED)
1490 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1492 /* Lost FIN, retransmit and return */
1493 if (tc->flags & TCP_CONN_FINSNT)
1497 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1501 /* Shouldn't be here. This condition is tricky because it has to take
1502 * into account boff > 0 due to persist timeout. */
1503 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1504 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1505 && !tcp_flight_size (tc)))
1507 ASSERT (!tcp_in_recovery (tc));
1512 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1513 * to persist timer timeout */
1514 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1517 tcp_update_rto (tc);
1520 /* Peer is dead or network connectivity is lost. Close connection.
1521 * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For
1522 * a min rto of 0.2s we need to retry about 8 times. */
1523 if (tc->rto_boff >= TCP_RTO_BOFF_MAX)
1525 tcp_send_reset (tc);
1526 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1527 session_transport_closing_notify (&tc->connection);
1528 tcp_connection_timers_reset (tc);
1529 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
1533 /* Increment RTO backoff (also equal to number of retries) and go back
1534 * to first un-acked byte */
1537 /* First retransmit timeout */
1538 if (tc->rto_boff == 1)
1539 tcp_rxt_timeout_cc (tc);
1541 scoreboard_clear (&tc->sack_sb);
1543 /* If we've sent beyond snd_congestion, update it */
1544 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1546 tc->snd_nxt = tc->snd_una;
1547 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1549 /* Send one segment. Note that n_bytes may be zero due to buffer
1551 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1554 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1558 bi = vlib_get_buffer_index (vm, b);
1560 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1561 if (tc->rto_boff == 1)
1562 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1564 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1565 tcp_retransmit_timer_force_update (tc);
1567 /* Retransmit for SYN */
1568 else if (tc->state == TCP_STATE_SYN_SENT)
1570 /* Half-open connection actually moved to established but we were
1571 * waiting for syn retransmit to pop to call cleanup from the right
1573 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1575 if (tcp_half_open_connection_cleanup (tc))
1576 TCP_DBG ("could not remove half-open connection");
1580 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1582 /* Try without increasing RTO a number of times. If this fails,
1583 * start growing RTO exponentially */
1585 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1586 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1588 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1589 tc->rto * TCP_TO_TIMER_TICK);
1591 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1593 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1597 b = vlib_get_buffer (vm, bi);
1598 tcp_init_buffer (vm, b);
1599 tcp_make_syn (tc, b);
1602 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1604 /* This goes straight to ipx_lookup. Retransmit timer set already */
1605 tcp_push_ip_hdr (wrk, tc, b);
1606 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1608 /* Retransmit SYN-ACK */
1609 else if (tc->state == TCP_STATE_SYN_RCVD)
1611 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1614 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1615 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1618 tcp_retransmit_timer_force_update (tc);
1620 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1622 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1626 b = vlib_get_buffer (vm, bi);
1627 tcp_init_buffer (vm, b);
1628 tcp_make_synack (tc, b);
1629 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1631 /* Retransmit timer already updated, just enqueue to output */
1632 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1636 ASSERT (tc->state == TCP_STATE_CLOSED);
1642 tcp_timer_retransmit_handler (u32 index)
1644 tcp_timer_retransmit_handler_i (index, 0);
1648 tcp_timer_retransmit_syn_handler (u32 index)
1650 tcp_timer_retransmit_handler_i (index, 1);
1654 * Got 0 snd_wnd from peer, try to do something about it.
1658 tcp_timer_persist_handler (u32 index)
1660 u32 thread_index = vlib_get_thread_index ();
1661 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1662 u32 bi, max_snd_bytes, available_bytes, offset;
1663 tcp_main_t *tm = vnet_get_tcp_main ();
1664 vlib_main_t *vm = wrk->vm;
1665 tcp_connection_t *tc;
1670 tc = tcp_connection_get_if_valid (index, thread_index);
1674 /* Make sure timer handle is set to invalid */
1675 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1677 /* Problem already solved or worse */
1678 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1679 || (tc->flags & TCP_CONN_FINSNT))
1682 available_bytes = transport_max_tx_dequeue (&tc->connection);
1683 offset = tc->snd_nxt - tc->snd_una;
1685 /* Reprogram persist if no new bytes available to send. We may have data
1687 if (!available_bytes)
1689 tcp_persist_timer_set (tc);
1693 if (available_bytes <= offset)
1695 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1699 /* Increment RTO backoff */
1701 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1704 * Try to force the first unsent segment (or buffer)
1706 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1708 tcp_persist_timer_set (tc);
1711 b = vlib_get_buffer (vm, bi);
1712 data = tcp_init_buffer (vm, b);
1714 tcp_validate_txf_size (tc, offset);
1715 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1716 max_snd_bytes = clib_min (tc->snd_mss,
1717 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1718 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1720 b->current_length = n_bytes;
1721 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1722 || tc->snd_nxt == tc->snd_una_max
1723 || tc->rto_boff > 1));
1725 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1726 /* burst */ 0, /* update_snd_nxt */ 1);
1727 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1728 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1729 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1731 /* Just sent new data, enable retransmit */
1732 tcp_retransmit_timer_update (tc);
1736 * Retransmit first unacked segment
1739 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1741 vlib_main_t *vm = wrk->vm;
1745 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1747 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1751 bi = vlib_get_buffer_index (vm, b);
1752 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1758 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1761 u32 offset, n_segs = 0, n_written, bi;
1762 vlib_main_t *vm = wrk->vm;
1763 vlib_buffer_t *b = 0;
1765 offset = tc->snd_nxt - tc->snd_una;
1766 while (n_segs < burst_size)
1768 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1772 bi = vlib_get_buffer_index (vm, b);
1773 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1774 offset += n_written;
1777 tc->snd_nxt += n_written;
1778 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1785 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1786 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1787 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1790 * Do fast retransmit with SACKs
1793 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1796 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1797 sack_scoreboard_hole_t *hole;
1798 vlib_main_t *vm = wrk->vm;
1799 vlib_buffer_t *b = 0;
1800 sack_scoreboard_t *sb;
1803 u8 snd_limited = 0, can_rescue = 0;
1805 ASSERT (tcp_in_fastrecovery (tc));
1807 snd_space = tcp_available_cc_snd_space (tc);
1808 if (snd_space < tc->snd_mss)
1810 tcp_program_fastretransmit (wrk, tc);
1814 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1816 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1818 max_deq = transport_max_tx_dequeue (&tc->connection);
1819 max_deq -= tc->snd_nxt - tc->snd_una;
1821 while (snd_space > 0 && n_segs < burst_size)
1823 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1829 snd_space = clib_min (max_deq, snd_space);
1830 burst_size = clib_min (burst_size - n_segs,
1831 snd_space / tc->snd_mss);
1832 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1833 if (max_deq > n_segs_now * tc->snd_mss)
1834 tcp_program_fastretransmit (wrk, tc);
1835 n_segs += n_segs_now;
1839 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1842 /* If rescue rxt undefined or less than snd_una then one segment of
1843 * up to SMSS octets that MUST include the highest outstanding
1844 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1845 * RecoveryPoint. HighRxt MUST NOT be updated.
1847 max_bytes = clib_min (tc->snd_mss,
1848 tc->snd_congestion - tc->snd_una);
1849 max_bytes = clib_min (max_bytes, snd_space);
1850 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1851 sb->rescue_rxt = tc->snd_congestion;
1852 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1857 bi = vlib_get_buffer_index (vm, b);
1858 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1863 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1864 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1868 offset = sb->high_rxt - tc->snd_una;
1869 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1871 ASSERT (n_written <= snd_space);
1873 /* Nothing left to retransmit */
1877 bi = vlib_get_buffer_index (vm, b);
1878 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1880 sb->high_rxt += n_written;
1881 snd_space -= n_written;
1886 tcp_program_fastretransmit (wrk, tc);
1893 * Fast retransmit without SACK info
1896 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1899 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1900 vlib_main_t *vm = wrk->vm;
1901 int snd_space, n_segs = 0;
1904 ASSERT (tcp_in_fastrecovery (tc));
1905 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1907 snd_space = tcp_available_cc_snd_space (tc);
1909 if (!tcp_fastrecovery_first (tc))
1912 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1914 while (snd_space > 0 && n_segs < burst_size)
1916 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1919 /* Nothing left to retransmit */
1923 bi = vlib_get_buffer_index (vm, b);
1924 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1925 snd_space -= n_written;
1926 offset += n_written;
1930 if (n_segs == burst_size)
1935 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1936 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1939 max_deq = transport_max_tx_dequeue (&tc->connection);
1940 max_deq -= tc->snd_nxt - tc->snd_una;
1943 snd_space = clib_min (max_deq, snd_space);
1944 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1945 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1946 if (max_deq > n_segs_now * tc->snd_mss)
1947 tcp_program_fastretransmit (wrk, tc);
1948 n_segs += n_segs_now;
1952 tcp_fastrecovery_first_off (tc);
1957 * Do fast retransmit
1960 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1963 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1964 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1966 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1968 #endif /* CLIB_MARCH_VARIANT */
1971 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1972 u16 * next0, u32 * error0)
1974 ip_adjacency_t *adj;
1977 /* Not thread safe but as long as the connection exists the adj should
1979 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1981 if (ai == ADJ_INDEX_INVALID)
1983 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1984 *next0 = TCP_OUTPUT_NEXT_DROP;
1985 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1990 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1991 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1992 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1993 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1996 *next0 = TCP_OUTPUT_NEXT_DROP;
1997 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1999 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2003 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2004 u32 * to_next, u32 n_bufs)
2006 u32 n_trace = vlib_get_trace_count (vm, node);
2007 tcp_connection_t *tc;
2013 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2015 b = vlib_get_buffer (vm, to_next[i]);
2016 th = vlib_buffer_get_current (b);
2017 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2019 t = vlib_add_trace (vm, node, b, sizeof (*t));
2020 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2021 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2026 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2027 tcp_connection_t * tc0, u8 is_ip4)
2029 tcp_header_t *th0 = 0;
2031 th0 = vlib_buffer_get_current (b0);
2032 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2035 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2036 IP_PROTOCOL_TCP, 1);
2037 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2038 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2044 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2045 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2046 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2047 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2048 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2054 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2055 u32 * error0, u16 * next0, u8 is_ip4)
2058 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2060 *error0 = TCP_ERROR_INVALID_CONNECTION;
2061 *next0 = TCP_OUTPUT_NEXT_DROP;
2065 /* If next_index is not drop use it */
2066 if (tc0->next_node_index)
2068 *next0 = tc0->next_node_index;
2069 vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
2072 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2073 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2077 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2078 tcp_output_handle_link_local (tc0, b0, next0, error0);
2081 if (!TCP_ALWAYS_ACK)
2082 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2086 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2087 vlib_frame_t * frame, int is_ip4)
2089 u32 n_left_from, *from, thread_index = vm->thread_index;
2090 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2091 u16 nexts[VLIB_FRAME_SIZE], *next;
2093 from = vlib_frame_vector_args (frame);
2094 n_left_from = frame->n_vectors;
2095 tcp_set_time_now (tcp_get_worker (thread_index));
2097 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2098 tcp46_output_trace_frame (vm, node, from, n_left_from);
2100 vlib_get_buffers (vm, from, bufs, n_left_from);
2104 while (n_left_from >= 4)
2106 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2107 tcp_connection_t *tc0, *tc1;
2110 vlib_prefetch_buffer_header (b[2], STORE);
2111 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2113 vlib_prefetch_buffer_header (b[3], STORE);
2114 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2117 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2119 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2121 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2124 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2125 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2127 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2128 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2134 while (n_left_from > 0)
2136 u32 error0 = TCP_ERROR_PKTS_SENT;
2137 tcp_connection_t *tc0;
2139 if (n_left_from > 1)
2141 vlib_prefetch_buffer_header (b[1], STORE);
2142 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2145 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2146 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2149 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2150 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2157 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2158 return frame->n_vectors;
2161 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2162 vlib_frame_t * from_frame)
2164 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2167 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2168 vlib_frame_t * from_frame)
2170 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2174 VLIB_REGISTER_NODE (tcp4_output_node) =
2176 .name = "tcp4-output",
2177 /* Takes a vector of packets. */
2178 .vector_size = sizeof (u32),
2179 .n_errors = TCP_N_ERROR,
2180 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2181 .error_strings = tcp_error_strings,
2182 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2184 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2185 foreach_tcp4_output_next
2188 .format_buffer = format_tcp_header,
2189 .format_trace = format_tcp_tx_trace,
2194 VLIB_REGISTER_NODE (tcp6_output_node) =
2196 .name = "tcp6-output",
2197 /* Takes a vector of packets. */
2198 .vector_size = sizeof (u32),
2199 .n_errors = TCP_N_ERROR,
2200 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2201 .error_strings = tcp_error_strings,
2202 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2204 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2205 foreach_tcp6_output_next
2208 .format_buffer = format_tcp_header,
2209 .format_trace = format_tcp_tx_trace,
2213 typedef enum _tcp_reset_next
2215 TCP_RESET_NEXT_DROP,
2216 TCP_RESET_NEXT_IP_LOOKUP,
2220 #define foreach_tcp4_reset_next \
2221 _(DROP, "error-drop") \
2222 _(IP_LOOKUP, "ip4-lookup")
2224 #define foreach_tcp6_reset_next \
2225 _(DROP, "error-drop") \
2226 _(IP_LOOKUP, "ip6-lookup")
2229 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2230 vlib_frame_t * from_frame, u8 is_ip4)
2232 u32 n_left_from, next_index, *from, *to_next;
2233 u32 my_thread_index = vm->thread_index;
2235 from = vlib_frame_vector_args (from_frame);
2236 n_left_from = from_frame->n_vectors;
2238 next_index = node->cached_next_index;
2240 while (n_left_from > 0)
2244 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2246 while (n_left_from > 0 && n_left_to_next > 0)
2252 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2259 n_left_to_next -= 1;
2261 b0 = vlib_get_buffer (vm, bi0);
2263 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2264 my_thread_index, is_ip4))
2266 error0 = TCP_ERROR_LOOKUP_DROPS;
2267 next0 = TCP_RESET_NEXT_DROP;
2271 /* Prepare to send to IP lookup */
2272 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2273 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2276 b0->error = node->errors[error0];
2277 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2278 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2280 th0 = vlib_buffer_get_current (b0);
2282 th0 = ip4_next_header ((ip4_header_t *) th0);
2284 th0 = ip6_next_header ((ip6_header_t *) th0);
2285 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2286 clib_memcpy_fast (&t0->tcp_header, th0,
2287 sizeof (t0->tcp_header));
2290 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2291 n_left_to_next, bi0, next0);
2293 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2295 return from_frame->n_vectors;
2298 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2299 vlib_frame_t * from_frame)
2301 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2304 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2305 vlib_frame_t * from_frame)
2307 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2311 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2312 .name = "tcp4-reset",
2313 .vector_size = sizeof (u32),
2314 .n_errors = TCP_N_ERROR,
2315 .error_strings = tcp_error_strings,
2316 .n_next_nodes = TCP_RESET_N_NEXT,
2318 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2319 foreach_tcp4_reset_next
2322 .format_trace = format_tcp_tx_trace,
2327 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2328 .name = "tcp6-reset",
2329 .vector_size = sizeof (u32),
2330 .n_errors = TCP_N_ERROR,
2331 .error_strings = tcp_error_strings,
2332 .n_next_nodes = TCP_RESET_N_NEXT,
2334 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2335 foreach_tcp6_reset_next
2338 .format_trace = format_tcp_tx_trace,
2343 * fd.io coding-style-patch-verification: ON
2346 * eval: (c-set-style "gnu")