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)
137 u32 available_space, max_fifo, wnd;
140 * Figure out how much space we have available
142 available_space = transport_max_rx_enqueue (&tc->connection);
143 max_fifo = transport_rx_fifo_size (&tc->connection);
145 ASSERT (tc->rcv_opts.mss < max_fifo);
146 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
150 * Use the above and what we know about what we've previously advertised
151 * to compute the new window
153 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
154 if (observed_wnd < 0)
157 /* Bad. Thou shalt not shrink */
158 if (available_space < observed_wnd)
161 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
165 wnd = available_space;
168 /* Make sure we have a multiple of rcv_wscale */
169 if (wnd && tc->rcv_wscale)
171 wnd &= ~((1 << tc->rcv_wscale) - 1);
173 wnd = 1 << tc->rcv_wscale;
176 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
180 * Compute and return window to advertise, scaled as per RFC1323
183 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
185 if (state < TCP_STATE_ESTABLISHED)
186 return tcp_initial_window_to_advertise (tc);
188 tcp_update_rcv_wnd (tc);
190 if (tc->rcv_wnd == 0)
192 tc->flags |= TCP_CONN_SENT_RCV_WND0;
196 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
199 return tc->rcv_wnd >> tc->rcv_wscale;
203 * Write TCP options to segment.
206 tcp_options_write (u8 * data, tcp_options_t * opts)
209 u32 buf, seq_len = 4;
211 if (tcp_opts_mss (opts))
213 *data++ = TCP_OPTION_MSS;
214 *data++ = TCP_OPTION_LEN_MSS;
215 buf = clib_host_to_net_u16 (opts->mss);
216 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
217 data += sizeof (opts->mss);
218 opts_len += TCP_OPTION_LEN_MSS;
221 if (tcp_opts_wscale (opts))
223 *data++ = TCP_OPTION_WINDOW_SCALE;
224 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
225 *data++ = opts->wscale;
226 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
229 if (tcp_opts_sack_permitted (opts))
231 *data++ = TCP_OPTION_SACK_PERMITTED;
232 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
233 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
236 if (tcp_opts_tstamp (opts))
238 *data++ = TCP_OPTION_TIMESTAMP;
239 *data++ = TCP_OPTION_LEN_TIMESTAMP;
240 buf = clib_host_to_net_u32 (opts->tsval);
241 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
242 data += sizeof (opts->tsval);
243 buf = clib_host_to_net_u32 (opts->tsecr);
244 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
245 data += sizeof (opts->tsecr);
246 opts_len += TCP_OPTION_LEN_TIMESTAMP;
249 if (tcp_opts_sack (opts))
253 if (opts->n_sack_blocks != 0)
255 *data++ = TCP_OPTION_SACK_BLOCK;
256 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
257 for (i = 0; i < opts->n_sack_blocks; i++)
259 buf = clib_host_to_net_u32 (opts->sacks[i].start);
260 clib_memcpy_fast (data, &buf, seq_len);
262 buf = clib_host_to_net_u32 (opts->sacks[i].end);
263 clib_memcpy_fast (data, &buf, seq_len);
266 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
270 /* Terminate TCP options */
273 *data++ = TCP_OPTION_EOL;
274 opts_len += TCP_OPTION_LEN_EOL;
277 /* Pad with zeroes to a u32 boundary */
280 *data++ = TCP_OPTION_NOOP;
281 opts_len += TCP_OPTION_LEN_NOOP;
287 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
291 opts->flags |= TCP_OPTS_FLAG_MSS;
292 opts->mss = tcp_main.default_mtu; /*XXX discover that */
293 len += TCP_OPTION_LEN_MSS;
295 opts->flags |= TCP_OPTS_FLAG_WSCALE;
296 opts->wscale = wnd_scale;
297 len += TCP_OPTION_LEN_WINDOW_SCALE;
299 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
300 opts->tsval = tcp_time_now ();
302 len += TCP_OPTION_LEN_TIMESTAMP;
306 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
307 len += TCP_OPTION_LEN_SACK_PERMITTED;
310 /* Align to needed boundary */
311 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
316 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
320 opts->flags |= TCP_OPTS_FLAG_MSS;
322 len += TCP_OPTION_LEN_MSS;
324 if (tcp_opts_wscale (&tc->rcv_opts))
326 opts->flags |= TCP_OPTS_FLAG_WSCALE;
327 opts->wscale = tc->rcv_wscale;
328 len += TCP_OPTION_LEN_WINDOW_SCALE;
331 if (tcp_opts_tstamp (&tc->rcv_opts))
333 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
334 opts->tsval = tcp_time_now ();
335 opts->tsecr = tc->tsval_recent;
336 len += TCP_OPTION_LEN_TIMESTAMP;
339 if (tcp_opts_sack_permitted (&tc->rcv_opts))
341 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
342 len += TCP_OPTION_LEN_SACK_PERMITTED;
345 /* Align to needed boundary */
346 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
351 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
357 if (tcp_opts_tstamp (&tc->rcv_opts))
359 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
360 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
361 opts->tsecr = tc->tsval_recent;
362 len += TCP_OPTION_LEN_TIMESTAMP;
364 if (tcp_opts_sack_permitted (&tc->rcv_opts))
366 if (vec_len (tc->snd_sacks))
368 opts->flags |= TCP_OPTS_FLAG_SACK;
369 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
370 tc->snd_sack_pos = 0;
371 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
372 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
373 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
374 TCP_OPTS_MAX_SACK_BLOCKS);
375 tc->snd_sack_pos += opts->n_sack_blocks;
376 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
380 /* Align to needed boundary */
381 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
386 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
391 case TCP_STATE_ESTABLISHED:
392 case TCP_STATE_CLOSE_WAIT:
393 case TCP_STATE_FIN_WAIT_1:
394 case TCP_STATE_LAST_ACK:
395 case TCP_STATE_CLOSING:
396 case TCP_STATE_FIN_WAIT_2:
397 case TCP_STATE_TIME_WAIT:
398 case TCP_STATE_CLOSED:
399 return tcp_make_established_options (tc, opts);
400 case TCP_STATE_SYN_RCVD:
401 return tcp_make_synack_options (tc, opts);
402 case TCP_STATE_SYN_SENT:
403 return tcp_make_syn_options (opts, tc->rcv_wscale);
405 clib_warning ("State not handled! %d", state);
411 * Update burst send vars
413 * - Updates snd_mss to reflect the effective segment size that we can send
414 * by taking into account all TCP options, including SACKs.
415 * - Cache 'on the wire' options for reuse
416 * - Updates receive window which can be reused for a burst.
418 * This should *only* be called when doing bursts
421 tcp_update_burst_snd_vars (tcp_connection_t * tc)
423 tcp_main_t *tm = &tcp_main;
425 /* Compute options to be used for connection. These may be reused when
426 * sending data or to compute the effective mss (snd_mss) */
427 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
428 TCP_STATE_ESTABLISHED);
430 /* XXX check if MTU has been updated */
431 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
432 ASSERT (tc->snd_mss > 0);
434 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
437 tcp_update_rcv_wnd (tc);
441 tcp_init_mss (tcp_connection_t * tc)
443 u16 default_min_mss = 536;
444 tcp_update_rcv_mss (tc);
446 /* TODO cache mss and consider PMTU discovery */
447 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
449 if (tc->snd_mss < 45)
451 /* Assume that at least the min default mss works */
452 tc->snd_mss = default_min_mss;
453 tc->rcv_opts.mss = default_min_mss;
456 /* We should have enough space for 40 bytes of options */
457 ASSERT (tc->snd_mss > 45);
459 /* If we use timestamp option, account for it */
460 if (tcp_opts_tstamp (&tc->rcv_opts))
461 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
463 #endif /* CLIB_MARCH_VARIANT */
466 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
468 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
469 vlib_buffer_free_one (vm, b->next_buffer);
470 /* Zero all flags but free list index and trace flag */
471 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
473 b->current_length = 0;
474 b->total_length_not_including_first_buffer = 0;
475 vnet_buffer (b)->tcp.flags = 0;
477 /* Leave enough space for headers */
478 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
481 #ifndef CLIB_MARCH_VARIANT
483 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
485 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
486 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
487 b->total_length_not_including_first_buffer = 0;
489 vnet_buffer (b)->tcp.flags = 0;
490 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
491 /* Leave enough space for headers */
492 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
499 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
502 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
503 u8 tcp_opts_len, tcp_hdr_opts_len;
507 wnd = tcp_window_to_advertise (tc, state);
509 /* Make and write options */
510 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
511 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
513 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
514 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
516 tcp_options_write ((u8 *) (th + 1), snd_opts);
517 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
521 * Convert buffer to ACK
524 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
526 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
527 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
528 tc->rcv_las = tc->rcv_nxt;
532 * Convert buffer to FIN-ACK
535 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
537 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
541 * Convert buffer to SYN
544 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
546 u8 tcp_hdr_opts_len, tcp_opts_len;
549 tcp_options_t snd_opts;
551 initial_wnd = tcp_initial_window_to_advertise (tc);
553 /* Make and write options */
554 clib_memset (&snd_opts, 0, sizeof (snd_opts));
555 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
556 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
558 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
559 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
561 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
562 tcp_options_write ((u8 *) (th + 1), &snd_opts);
566 * Convert buffer to SYN-ACK
569 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
571 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
572 u8 tcp_opts_len, tcp_hdr_opts_len;
576 clib_memset (snd_opts, 0, sizeof (*snd_opts));
577 initial_wnd = tcp_initial_window_to_advertise (tc);
578 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
579 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
581 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
582 tc->rcv_nxt, tcp_hdr_opts_len,
583 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
584 tcp_options_write ((u8 *) (th + 1), snd_opts);
586 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
590 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
591 u8 is_ip4, u32 fib_index, u8 flush)
593 vlib_main_t *vm = wrk->vm;
594 u32 *to_next, next_index;
597 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
600 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
601 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
603 /* Send to IP lookup */
604 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
605 tcp_trajectory_add_start (b, 1);
607 f = wrk->ip_lookup_tx_frames[!is_ip4];
610 f = vlib_get_frame_to_node (vm, next_index);
612 wrk->ip_lookup_tx_frames[!is_ip4] = f;
615 to_next = vlib_frame_vector_args (f);
616 to_next[f->n_vectors] = bi;
618 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
620 vlib_put_frame_to_node (vm, next_index, f);
621 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
626 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
627 u32 bi, u8 is_ip4, u32 fib_index)
629 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
633 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
634 u8 is_ip4, u32 fib_index)
636 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
637 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
638 session_flush_frames_main_thread (wrk->vm);
642 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
645 u32 *to_next, next_index;
648 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
651 /* Decide where to send the packet */
652 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
653 tcp_trajectory_add_start (b, 2);
655 /* Get frame to v4/6 output node */
656 f = wrk->tx_frames[!is_ip4];
659 f = vlib_get_frame_to_node (wrk->vm, next_index);
661 wrk->tx_frames[!is_ip4] = f;
663 to_next = vlib_frame_vector_args (f);
664 to_next[f->n_vectors] = bi;
666 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
668 vlib_put_frame_to_node (wrk->vm, next_index, f);
669 wrk->tx_frames[!is_ip4] = 0;
674 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
677 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
681 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
684 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
686 #endif /* CLIB_MARCH_VARIANT */
689 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
690 tcp_state_t state, u8 thread_index, u8 is_ip4)
695 ip4_address_t src_ip40, dst_ip40;
696 ip6_address_t src_ip60, dst_ip60;
697 u16 src_port, dst_port;
702 /* Find IP and TCP headers */
703 th0 = tcp_buffer_hdr (b0);
705 /* Save src and dst ip */
708 ih4 = vlib_buffer_get_current (b0);
709 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
710 src_ip40.as_u32 = ih4->src_address.as_u32;
711 dst_ip40.as_u32 = ih4->dst_address.as_u32;
715 ih6 = vlib_buffer_get_current (b0);
716 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
717 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
718 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
721 src_port = th0->src_port;
722 dst_port = th0->dst_port;
724 /* Try to determine what/why we're actually resetting */
725 if (state == TCP_STATE_CLOSED)
730 tmp = clib_net_to_host_u32 (th0->seq_number);
732 /* Got a SYN for no listener. */
733 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
734 ack = clib_host_to_net_u32 (tmp + 1);
739 flags = TCP_FLAG_RST;
740 seq = th0->ack_number;
744 tcp_reuse_buffer (vm, b0);
745 tcp_trajectory_add_start (b0, 4);
746 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
747 sizeof (tcp_header_t), flags, 0);
751 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
753 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
758 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
760 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
767 #ifndef CLIB_MARCH_VARIANT
769 * Send reset without reusing existing buffer
771 * It extracts connection info out of original packet
774 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
775 u32 thread_index, u8 is_ip4)
777 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
778 vlib_main_t *vm = wrk->vm;
780 u32 bi, sw_if_index, fib_index;
781 u8 tcp_hdr_len, flags = 0;
782 tcp_header_t *th, *pkt_th;
784 ip4_header_t *ih4, *pkt_ih4;
785 ip6_header_t *ih6, *pkt_ih6;
786 fib_protocol_t fib_proto;
788 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
791 b = vlib_get_buffer (vm, bi);
792 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
793 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
794 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
795 tcp_init_buffer (vm, b);
797 /* Make and write options */
798 tcp_hdr_len = sizeof (tcp_header_t);
802 pkt_ih4 = vlib_buffer_get_current (pkt);
803 pkt_th = ip4_next_header (pkt_ih4);
807 pkt_ih6 = vlib_buffer_get_current (pkt);
808 pkt_th = ip6_next_header (pkt_ih6);
811 if (tcp_ack (pkt_th))
813 flags = TCP_FLAG_RST;
814 seq = pkt_th->ack_number;
815 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
819 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
821 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
824 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
825 seq, ack, tcp_hdr_len, flags, 0);
827 /* Swap src and dst ip */
830 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
831 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
832 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
833 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
838 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
840 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
841 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
842 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
846 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
847 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
851 * Build and set reset packet for connection
854 tcp_send_reset (tcp_connection_t * tc)
856 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
857 vlib_main_t *vm = wrk->vm;
861 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
864 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
866 b = vlib_get_buffer (vm, bi);
867 tcp_init_buffer (vm, b);
869 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
870 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
871 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
872 flags = TCP_FLAG_RST;
873 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
874 tc->rcv_nxt, tcp_hdr_opts_len, flags,
876 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
877 ASSERT (opts_write_len == tc->snd_opts_len);
878 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
882 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
883 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
884 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
890 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
891 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
892 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
895 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
896 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
900 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
903 tcp_header_t *th = vlib_buffer_get_current (b);
904 vlib_main_t *vm = wrk->vm;
908 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
909 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
910 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
917 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
918 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
919 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
927 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
928 * The packet is not forwarded through tcpx_output to avoid doing lookups
929 * in the half_open pool.
932 tcp_send_syn (tcp_connection_t * tc)
934 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
935 vlib_main_t *vm = wrk->vm;
940 * Setup retransmit and establish timers before requesting buffer
941 * such that we can return if we've ran out.
943 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
944 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
945 tc->rto * TCP_TO_TIMER_TICK);
947 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
949 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
953 b = vlib_get_buffer (vm, bi);
954 tcp_init_buffer (vm, b);
955 tcp_make_syn (tc, b);
957 /* Measure RTT with this */
958 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
959 tc->rtt_seq = tc->snd_nxt;
962 tcp_push_ip_hdr (wrk, tc, b);
963 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
964 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
968 tcp_send_synack (tcp_connection_t * tc)
970 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
971 vlib_main_t *vm = wrk->vm;
975 tcp_retransmit_timer_force_update (tc);
977 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
979 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
983 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
984 b = vlib_get_buffer (vm, bi);
985 tcp_init_buffer (vm, b);
986 tcp_make_synack (tc, b);
987 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
988 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
992 * Flush tx frame populated by retransmits and timer pops
995 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
997 if (wrk->tx_frames[!is_ip4])
1000 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1001 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1002 wrk->tx_frames[!is_ip4] = 0;
1007 * Flush ip lookup tx frames populated by timer pops
1010 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1012 if (wrk->ip_lookup_tx_frames[!is_ip4])
1015 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1016 vlib_put_frame_to_node (wrk->vm, next_index,
1017 wrk->ip_lookup_tx_frames[!is_ip4]);
1018 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1023 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1026 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1028 tcp_flush_frame_to_output (wrk, 1);
1029 tcp_flush_frame_to_output (wrk, 0);
1030 tcp_flush_frame_to_ip_lookup (wrk, 1);
1031 tcp_flush_frame_to_ip_lookup (wrk, 0);
1038 tcp_send_fin (tcp_connection_t * tc)
1040 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1041 vlib_main_t *vm = wrk->vm;
1046 fin_snt = tc->flags & TCP_CONN_FINSNT;
1050 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1052 /* Out of buffers so program fin retransmit ASAP */
1053 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1057 /* Make sure retransmit retries a fin not data */
1058 tc->flags |= TCP_CONN_FINSNT;
1062 tcp_retransmit_timer_force_update (tc);
1063 b = vlib_get_buffer (vm, bi);
1064 tcp_init_buffer (vm, b);
1065 tcp_make_fin (tc, b);
1066 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1067 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1068 /* Account for the FIN */
1072 tc->flags |= TCP_CONN_FINSNT;
1073 tc->flags &= ~TCP_CONN_FINPNDG;
1074 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1079 * Push TCP header and update connection variables. Should only be called
1080 * for segments with data, not for 'control' packets.
1083 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1084 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1086 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1087 u32 advertise_wnd, data_len;
1088 tcp_main_t *tm = &tcp_main;
1091 data_len = b->current_length;
1092 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1093 data_len += b->total_length_not_including_first_buffer;
1095 vnet_buffer (b)->tcp.flags = 0;
1096 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1099 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1101 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1104 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1106 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1108 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1110 if (seq_geq (tc->psh_seq, snd_nxt)
1111 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1112 flags |= TCP_FLAG_PSH;
1114 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1115 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1120 clib_memcpy_fast ((u8 *) (th + 1),
1121 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1126 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1127 ASSERT (len == tc->snd_opts_len);
1131 * Update connection variables
1135 tc->snd_nxt += data_len;
1136 tc->rcv_las = tc->rcv_nxt;
1138 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1142 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1144 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1145 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1146 /* update_snd_nxt */ 1);
1147 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1148 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1149 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1150 /* If not tracking an ACK, start tracking */
1151 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1153 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1154 tc->rtt_seq = tc->snd_nxt;
1156 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1158 tcp_retransmit_timer_set (tc);
1161 tcp_trajectory_add_start (b, 3);
1166 tcp_send_ack (tcp_connection_t * tc)
1168 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1169 vlib_main_t *vm = wrk->vm;
1173 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1175 tcp_update_rcv_wnd (tc);
1178 b = vlib_get_buffer (vm, bi);
1179 tcp_init_buffer (vm, b);
1180 tcp_make_ack (tc, b);
1181 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1185 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1187 if (!(tc->flags & TCP_CONN_SNDACK))
1189 vec_add1 (wrk->pending_acks, tc->c_c_index);
1190 tc->flags |= TCP_CONN_SNDACK;
1195 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1197 if (!(tc->flags & TCP_CONN_SNDACK))
1199 vec_add1 (wrk->pending_acks, tc->c_c_index);
1200 tc->flags |= TCP_CONN_SNDACK;
1202 if (tc->pending_dupacks < 255)
1203 tc->pending_dupacks += 1;
1207 tcp_send_acks (tcp_worker_ctx_t * wrk)
1209 u32 thread_index, *pending_acks;
1210 tcp_connection_t *tc;
1213 if (!vec_len (wrk->pending_acks))
1216 thread_index = wrk->vm->thread_index;
1217 pending_acks = wrk->pending_acks;
1218 for (i = 0; i < vec_len (pending_acks); i++)
1220 tc = tcp_connection_get (pending_acks[i], thread_index);
1221 tc->flags &= ~TCP_CONN_SNDACK;
1222 if (!tc->pending_dupacks)
1228 /* If we're supposed to send dupacks but have no ooo data
1229 * send only one ack */
1230 if (!vec_len (tc->snd_sacks))
1236 /* Start with first sack block */
1237 tc->snd_sack_pos = 0;
1239 /* Generate enough dupacks to cover all sack blocks. Do not generate
1240 * more sacks than the number of packets received. But do generate at
1241 * least 3, i.e., the number needed to signal congestion, if needed. */
1242 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1243 n_acks = clib_min (n_acks, tc->pending_dupacks);
1244 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1245 for (j = 0; j < n_acks; j++)
1248 tc->pending_dupacks = 0;
1249 tc->snd_sack_pos = 0;
1251 _vec_len (wrk->pending_acks) = 0;
1255 * Delayed ack timer handler
1257 * Sends delayed ACK when timer expires
1260 tcp_timer_delack_handler (u32 index)
1262 u32 thread_index = vlib_get_thread_index ();
1263 tcp_connection_t *tc;
1265 tc = tcp_connection_get (index, thread_index);
1266 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1271 * Allocate a new buffer and build a new tcp segment
1273 * @param wrk tcp worker
1274 * @param tc connection for which the segment will be allocated
1275 * @param offset offset of the first byte in the tx fifo
1276 * @param max_deq_byte segment size
1277 * @param[out] b pointer to buffer allocated
1279 * @return the number of bytes in the segment or 0 if buffer cannot be
1280 * allocated or no data available
1283 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1284 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1286 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1287 vlib_main_t *vm = wrk->vm;
1292 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1297 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1300 * Allocate and fill in buffer(s)
1303 /* Easy case, buffer size greater than mss */
1304 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1306 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1308 *b = vlib_get_buffer (vm, bi);
1309 data = tcp_init_buffer (vm, *b);
1310 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1312 ASSERT (n_bytes == max_deq_bytes);
1313 b[0]->current_length = n_bytes;
1314 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1315 /* burst */ 0, /* update_snd_nxt */ 0);
1317 /* Split mss into multiple buffers */
1320 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1321 u16 n_peeked, len_to_deq;
1322 vlib_buffer_t *chain_b, *prev_b;
1325 /* Make sure we have enough buffers */
1326 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1327 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1328 CLIB_CACHE_LINE_BYTES);
1329 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1330 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1333 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1337 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1338 data = tcp_init_buffer (vm, *b);
1339 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1341 TRANSPORT_MAX_HDRS_LEN);
1342 b[0]->current_length = n_bytes;
1343 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1344 b[0]->total_length_not_including_first_buffer = 0;
1345 max_deq_bytes -= n_bytes;
1348 for (i = 1; i < n_bufs_per_seg; i++)
1351 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1352 chain_bi = wrk->tx_buffers[--n_bufs];
1353 chain_b = vlib_get_buffer (vm, chain_bi);
1354 chain_b->current_data = 0;
1355 data = vlib_buffer_get_current (chain_b);
1356 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1359 ASSERT (n_peeked == len_to_deq);
1360 n_bytes += n_peeked;
1361 chain_b->current_length = n_peeked;
1362 chain_b->next_buffer = 0;
1364 /* update previous buffer */
1365 prev_b->next_buffer = chain_bi;
1366 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1368 max_deq_bytes -= n_peeked;
1369 b[0]->total_length_not_including_first_buffer += n_peeked;
1372 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1373 /* burst */ 0, /* update_snd_nxt */ 0);
1375 if (PREDICT_FALSE (n_bufs))
1377 clib_warning ("not all buffers consumed");
1378 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1382 ASSERT (n_bytes > 0);
1383 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1389 * Build a retransmit segment
1391 * @return the number of bytes in the segment or 0 if there's nothing to
1395 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1396 tcp_connection_t * tc, u32 offset,
1397 u32 max_deq_bytes, vlib_buffer_t ** b)
1399 u32 start, available_bytes;
1402 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1403 ASSERT (max_deq_bytes != 0);
1406 * Make sure we can retransmit something
1408 available_bytes = transport_max_tx_dequeue (&tc->connection);
1409 ASSERT (available_bytes >= offset);
1410 available_bytes -= offset;
1411 if (!available_bytes)
1414 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1415 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1417 /* Start is beyond snd_congestion */
1418 start = tc->snd_una + offset;
1419 if (seq_geq (start, tc->snd_congestion))
1422 /* Don't overshoot snd_congestion */
1423 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1425 max_deq_bytes = tc->snd_congestion - start;
1426 if (max_deq_bytes == 0)
1430 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1434 if (tcp_in_fastrecovery (tc))
1435 tc->snd_rxt_bytes += n_bytes;
1438 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1443 * Reset congestion control, switch cwnd to loss window and try again.
1446 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1448 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1449 tc->prev_ssthresh = tc->ssthresh;
1450 tc->prev_cwnd = tc->cwnd;
1452 /* Cleanly recover cc (also clears up fast retransmit) */
1453 if (tcp_in_fastrecovery (tc))
1455 /* TODO be less aggressive about this */
1456 scoreboard_clear (&tc->sack_sb);
1457 tcp_cc_fastrecovery_exit (tc);
1460 tc->rcv_dupacks = 0;
1462 /* Start again from the beginning */
1463 tc->cc_algo->congestion (tc);
1464 tc->cwnd = tcp_loss_wnd (tc);
1465 tc->snd_congestion = tc->snd_nxt;
1467 tc->cwnd_acc_bytes = 0;
1468 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1469 tcp_recovery_on (tc);
1473 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1475 u32 thread_index = vlib_get_thread_index ();
1476 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1477 vlib_main_t *vm = wrk->vm;
1478 tcp_connection_t *tc;
1479 vlib_buffer_t *b = 0;
1484 tc = tcp_half_open_connection_get (index);
1485 /* Note: the connection may have transitioned to ESTABLISHED... */
1486 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1488 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1492 tc = tcp_connection_get (index, thread_index);
1493 /* Note: the connection may have been closed and pool_put */
1494 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1496 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1497 /* Wait-close and retransmit could pop at the same time */
1498 if (tc->state == TCP_STATE_CLOSED)
1502 if (tc->state >= TCP_STATE_ESTABLISHED)
1504 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1506 /* Lost FIN, retransmit and return */
1507 if (tc->flags & TCP_CONN_FINSNT)
1511 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1515 /* Shouldn't be here. This condition is tricky because it has to take
1516 * into account boff > 0 due to persist timeout. */
1517 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1518 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1519 && !tcp_flight_size (tc)))
1521 ASSERT (!tcp_in_recovery (tc));
1526 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1527 * to persist timer timeout */
1528 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1531 tcp_update_rto (tc);
1534 /* Increment RTO backoff (also equal to number of retries) and go back
1535 * to first un-acked byte */
1538 /* First retransmit timeout */
1539 if (tc->rto_boff == 1)
1540 tcp_rxt_timeout_cc (tc);
1542 scoreboard_clear (&tc->sack_sb);
1544 /* If we've sent beyond snd_congestion, update it */
1545 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1547 tc->snd_nxt = tc->snd_una;
1548 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1550 /* Send one segment. Note that n_bytes may be zero due to buffer
1552 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1555 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1559 bi = vlib_get_buffer_index (vm, b);
1561 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1562 if (tc->rto_boff == 1)
1563 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1565 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1566 tcp_retransmit_timer_force_update (tc);
1568 /* Retransmit for SYN */
1569 else if (tc->state == TCP_STATE_SYN_SENT)
1571 /* Half-open connection actually moved to established but we were
1572 * waiting for syn retransmit to pop to call cleanup from the right
1574 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1576 if (tcp_half_open_connection_cleanup (tc))
1577 TCP_DBG ("could not remove half-open connection");
1581 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1583 /* Try without increasing RTO a number of times. If this fails,
1584 * start growing RTO exponentially */
1586 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1587 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1589 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1590 tc->rto * TCP_TO_TIMER_TICK);
1592 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1594 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1598 b = vlib_get_buffer (vm, bi);
1599 tcp_init_buffer (vm, b);
1600 tcp_make_syn (tc, b);
1603 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1605 /* This goes straight to ipx_lookup. Retransmit timer set already */
1606 tcp_push_ip_hdr (wrk, tc, b);
1607 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1609 /* Retransmit SYN-ACK */
1610 else if (tc->state == TCP_STATE_SYN_RCVD)
1612 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1615 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1616 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1619 tcp_retransmit_timer_force_update (tc);
1621 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1623 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1627 b = vlib_get_buffer (vm, bi);
1628 tcp_init_buffer (vm, b);
1629 tcp_make_synack (tc, b);
1630 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1632 /* Retransmit timer already updated, just enqueue to output */
1633 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1637 ASSERT (tc->state == TCP_STATE_CLOSED);
1643 tcp_timer_retransmit_handler (u32 index)
1645 tcp_timer_retransmit_handler_i (index, 0);
1649 tcp_timer_retransmit_syn_handler (u32 index)
1651 tcp_timer_retransmit_handler_i (index, 1);
1655 * Got 0 snd_wnd from peer, try to do something about it.
1659 tcp_timer_persist_handler (u32 index)
1661 u32 thread_index = vlib_get_thread_index ();
1662 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1663 u32 bi, max_snd_bytes, available_bytes, offset;
1664 tcp_main_t *tm = vnet_get_tcp_main ();
1665 vlib_main_t *vm = wrk->vm;
1666 tcp_connection_t *tc;
1671 tc = tcp_connection_get_if_valid (index, thread_index);
1675 /* Make sure timer handle is set to invalid */
1676 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1678 /* Problem already solved or worse */
1679 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1680 || (tc->flags & TCP_CONN_FINSNT))
1683 available_bytes = transport_max_tx_dequeue (&tc->connection);
1684 offset = tc->snd_nxt - tc->snd_una;
1686 /* Reprogram persist if no new bytes available to send. We may have data
1688 if (!available_bytes)
1690 tcp_persist_timer_set (tc);
1694 if (available_bytes <= offset)
1696 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1700 /* Increment RTO backoff */
1702 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1705 * Try to force the first unsent segment (or buffer)
1707 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1709 tcp_persist_timer_set (tc);
1712 b = vlib_get_buffer (vm, bi);
1713 data = tcp_init_buffer (vm, b);
1715 tcp_validate_txf_size (tc, offset);
1716 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1717 max_snd_bytes = clib_min (tc->snd_mss,
1718 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1719 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1721 b->current_length = n_bytes;
1722 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1723 || tc->snd_nxt == tc->snd_una_max
1724 || tc->rto_boff > 1));
1726 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1727 /* burst */ 0, /* update_snd_nxt */ 1);
1728 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1729 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1730 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1732 /* Just sent new data, enable retransmit */
1733 tcp_retransmit_timer_update (tc);
1737 * Retransmit first unacked segment
1740 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1742 vlib_main_t *vm = wrk->vm;
1746 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1748 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1752 bi = vlib_get_buffer_index (vm, b);
1753 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1759 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1762 u32 offset, n_segs = 0, n_written, bi;
1763 vlib_main_t *vm = wrk->vm;
1764 vlib_buffer_t *b = 0;
1766 offset = tc->snd_nxt - tc->snd_una;
1767 while (n_segs < burst_size)
1769 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1773 bi = vlib_get_buffer_index (vm, b);
1774 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1775 offset += n_written;
1778 tc->snd_nxt += n_written;
1779 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1786 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1787 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1788 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1791 * Do fast retransmit with SACKs
1794 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1797 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1798 sack_scoreboard_hole_t *hole;
1799 vlib_main_t *vm = wrk->vm;
1800 vlib_buffer_t *b = 0;
1801 sack_scoreboard_t *sb;
1804 u8 snd_limited = 0, can_rescue = 0;
1806 ASSERT (tcp_in_fastrecovery (tc));
1808 snd_space = tcp_available_cc_snd_space (tc);
1809 if (snd_space < tc->snd_mss)
1811 tcp_program_fastretransmit (wrk, tc);
1815 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1817 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1819 max_deq = transport_max_tx_dequeue (&tc->connection);
1820 max_deq -= tc->snd_nxt - tc->snd_una;
1822 while (snd_space > 0 && n_segs < burst_size)
1824 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1830 snd_space = clib_min (max_deq, snd_space);
1831 burst_size = clib_min (burst_size - n_segs,
1832 snd_space / tc->snd_mss);
1833 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1834 if (max_deq > n_segs_now * tc->snd_mss)
1835 tcp_program_fastretransmit (wrk, tc);
1836 n_segs += n_segs_now;
1840 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1843 /* If rescue rxt undefined or less than snd_una then one segment of
1844 * up to SMSS octets that MUST include the highest outstanding
1845 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1846 * RecoveryPoint. HighRxt MUST NOT be updated.
1848 max_bytes = clib_min (tc->snd_mss,
1849 tc->snd_congestion - tc->snd_una);
1850 max_bytes = clib_min (max_bytes, snd_space);
1851 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1852 sb->rescue_rxt = tc->snd_congestion;
1853 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1858 bi = vlib_get_buffer_index (vm, b);
1859 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1864 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1865 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1869 offset = sb->high_rxt - tc->snd_una;
1870 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1872 ASSERT (n_written <= snd_space);
1874 /* Nothing left to retransmit */
1878 bi = vlib_get_buffer_index (vm, b);
1879 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1881 sb->high_rxt += n_written;
1882 snd_space -= n_written;
1887 tcp_program_fastretransmit (wrk, tc);
1894 * Fast retransmit without SACK info
1897 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1900 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1901 vlib_main_t *vm = wrk->vm;
1902 int snd_space, n_segs = 0;
1905 ASSERT (tcp_in_fastrecovery (tc));
1906 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1908 if (!tcp_fastrecovery_first (tc))
1911 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1913 snd_space = tc->sack_sb.last_bytes_delivered;
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 snd_space = tcp_available_cc_snd_space (tc);
1937 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1940 max_deq = transport_max_tx_dequeue (&tc->connection);
1941 max_deq -= tc->snd_nxt - tc->snd_una;
1944 snd_space = clib_min (max_deq, snd_space);
1945 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1946 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1947 if (max_deq > n_segs_now * tc->snd_mss)
1948 tcp_program_fastretransmit (wrk, tc);
1949 n_segs += n_segs_now;
1953 tcp_fastrecovery_first_off (tc);
1958 * Do fast retransmit
1961 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1964 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1965 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1967 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1969 #endif /* CLIB_MARCH_VARIANT */
1972 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1973 u16 * next0, u32 * error0)
1975 ip_adjacency_t *adj;
1978 /* Not thread safe but as long as the connection exists the adj should
1980 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1982 if (ai == ADJ_INDEX_INVALID)
1984 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1985 *next0 = TCP_OUTPUT_NEXT_DROP;
1986 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1991 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1992 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1993 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1994 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1997 *next0 = TCP_OUTPUT_NEXT_DROP;
1998 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2000 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2004 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2005 u32 * to_next, u32 n_bufs)
2007 u32 n_trace = vlib_get_trace_count (vm, node);
2008 tcp_connection_t *tc;
2014 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2016 b = vlib_get_buffer (vm, to_next[i]);
2017 th = vlib_buffer_get_current (b);
2018 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2020 t = vlib_add_trace (vm, node, b, sizeof (*t));
2021 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2022 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2027 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2028 tcp_connection_t * tc0, u8 is_ip4)
2030 tcp_header_t *th0 = 0;
2032 th0 = vlib_buffer_get_current (b0);
2033 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2036 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2037 IP_PROTOCOL_TCP, 1);
2038 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2039 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2045 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2046 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2047 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2048 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2049 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2055 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2056 u32 * error0, u16 * next0, u8 is_ip4)
2059 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2061 *error0 = TCP_ERROR_INVALID_CONNECTION;
2062 *next0 = TCP_OUTPUT_NEXT_DROP;
2066 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2067 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2071 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2072 tcp_output_handle_link_local (tc0, b0, next0, error0);
2075 if (!TCP_ALWAYS_ACK)
2076 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2080 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2081 vlib_frame_t * frame, int is_ip4)
2083 u32 n_left_from, *from, thread_index = vm->thread_index;
2084 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2085 u16 nexts[VLIB_FRAME_SIZE], *next;
2087 from = vlib_frame_vector_args (frame);
2088 n_left_from = frame->n_vectors;
2089 tcp_set_time_now (tcp_get_worker (thread_index));
2091 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2092 tcp46_output_trace_frame (vm, node, from, n_left_from);
2094 vlib_get_buffers (vm, from, bufs, n_left_from);
2098 while (n_left_from >= 4)
2100 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2101 tcp_connection_t *tc0, *tc1;
2104 vlib_prefetch_buffer_header (b[2], STORE);
2105 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2107 vlib_prefetch_buffer_header (b[3], STORE);
2108 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2111 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2113 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2115 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2118 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2119 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2121 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2122 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2128 while (n_left_from > 0)
2130 u32 error0 = TCP_ERROR_PKTS_SENT;
2131 tcp_connection_t *tc0;
2133 if (n_left_from > 1)
2135 vlib_prefetch_buffer_header (b[1], STORE);
2136 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2139 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2140 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2143 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2144 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2151 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2152 return frame->n_vectors;
2155 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2156 vlib_frame_t * from_frame)
2158 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2161 VLIB_NODE_FN (tcp6_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, 0 /* is_ip4 */ );
2168 VLIB_REGISTER_NODE (tcp4_output_node) =
2170 .name = "tcp4-output",
2171 /* Takes a vector of packets. */
2172 .vector_size = sizeof (u32),
2173 .n_errors = TCP_N_ERROR,
2174 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2175 .error_strings = tcp_error_strings,
2176 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2178 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2179 foreach_tcp4_output_next
2182 .format_buffer = format_tcp_header,
2183 .format_trace = format_tcp_tx_trace,
2188 VLIB_REGISTER_NODE (tcp6_output_node) =
2190 .name = "tcp6-output",
2191 /* Takes a vector of packets. */
2192 .vector_size = sizeof (u32),
2193 .n_errors = TCP_N_ERROR,
2194 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2195 .error_strings = tcp_error_strings,
2196 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2198 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2199 foreach_tcp6_output_next
2202 .format_buffer = format_tcp_header,
2203 .format_trace = format_tcp_tx_trace,
2207 typedef enum _tcp_reset_next
2209 TCP_RESET_NEXT_DROP,
2210 TCP_RESET_NEXT_IP_LOOKUP,
2214 #define foreach_tcp4_reset_next \
2215 _(DROP, "error-drop") \
2216 _(IP_LOOKUP, "ip4-lookup")
2218 #define foreach_tcp6_reset_next \
2219 _(DROP, "error-drop") \
2220 _(IP_LOOKUP, "ip6-lookup")
2223 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2224 vlib_frame_t * from_frame, u8 is_ip4)
2226 u32 n_left_from, next_index, *from, *to_next;
2227 u32 my_thread_index = vm->thread_index;
2229 from = vlib_frame_vector_args (from_frame);
2230 n_left_from = from_frame->n_vectors;
2232 next_index = node->cached_next_index;
2234 while (n_left_from > 0)
2238 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2240 while (n_left_from > 0 && n_left_to_next > 0)
2246 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2253 n_left_to_next -= 1;
2255 b0 = vlib_get_buffer (vm, bi0);
2257 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2258 my_thread_index, is_ip4))
2260 error0 = TCP_ERROR_LOOKUP_DROPS;
2261 next0 = TCP_RESET_NEXT_DROP;
2265 /* Prepare to send to IP lookup */
2266 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2267 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2270 b0->error = node->errors[error0];
2271 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2272 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2274 th0 = vlib_buffer_get_current (b0);
2276 th0 = ip4_next_header ((ip4_header_t *) th0);
2278 th0 = ip6_next_header ((ip6_header_t *) th0);
2279 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2280 clib_memcpy_fast (&t0->tcp_header, th0,
2281 sizeof (t0->tcp_header));
2284 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2285 n_left_to_next, bi0, next0);
2287 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2289 return from_frame->n_vectors;
2292 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2293 vlib_frame_t * from_frame)
2295 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2298 VLIB_NODE_FN (tcp6_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, 0);
2305 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2306 .name = "tcp4-reset",
2307 .vector_size = sizeof (u32),
2308 .n_errors = TCP_N_ERROR,
2309 .error_strings = tcp_error_strings,
2310 .n_next_nodes = TCP_RESET_N_NEXT,
2312 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2313 foreach_tcp4_reset_next
2316 .format_trace = format_tcp_tx_trace,
2321 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2322 .name = "tcp6-reset",
2323 .vector_size = sizeof (u32),
2324 .n_errors = TCP_N_ERROR,
2325 .error_strings = tcp_error_strings,
2326 .n_next_nodes = TCP_RESET_N_NEXT,
2328 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2329 foreach_tcp6_reset_next
2332 .format_trace = format_tcp_tx_trace,
2337 * fd.io coding-style-patch-verification: ON
2340 * eval: (c-set-style "gnu")