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 vlib_node_registration_t tcp4_output_node;
20 vlib_node_registration_t tcp6_output_node;
22 typedef enum _tcp_output_next
25 TCP_OUTPUT_NEXT_IP_LOOKUP,
26 TCP_OUTPUT_NEXT_IP_REWRITE,
27 TCP_OUTPUT_NEXT_IP_ARP,
31 #define foreach_tcp4_output_next \
32 _ (DROP, "error-drop") \
33 _ (IP_LOOKUP, "ip4-lookup") \
34 _ (IP_REWRITE, "ip4-rewrite") \
37 #define foreach_tcp6_output_next \
38 _ (DROP, "error-drop") \
39 _ (IP_LOOKUP, "ip6-lookup") \
40 _ (IP_REWRITE, "ip6-rewrite") \
41 _ (IP_ARP, "ip6-discover-neighbor")
43 static char *tcp_error_strings[] = {
44 #define tcp_error(n,s) s,
45 #include <vnet/tcp/tcp_error.def>
51 tcp_header_t tcp_header;
52 tcp_connection_t tcp_connection;
58 format_tcp_tx_trace (u8 * s, va_list * args)
60 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
63 u32 indent = format_get_indent (s);
65 s = format (s, "%U\n%U%U",
66 format_tcp_header, &t->tcp_header, 128,
67 format_white_space, indent,
68 format_tcp_connection, &t->tcp_connection, 1);
74 tcp_window_compute_scale (u32 window)
77 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
83 * Update max segment size we're able to process.
85 * The value is constrained by our interface's MTU and IP options. It is
86 * also what we advertise to our peer.
89 tcp_update_rcv_mss (tcp_connection_t * tc)
91 /* TODO find our iface MTU */
92 tc->mss = dummy_mtu - sizeof (tcp_header_t);
96 * TCP's initial window
99 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
101 /* RFC 6928 recommends the value lower. However at the time our connections
102 * are initialized, fifos may not be allocated. Therefore, advertise the
103 * smallest possible unscaled window size and update once fifos are
104 * assigned to the session.
107 tcp_update_rcv_mss (tc);
108 TCP_IW_N_SEGMENTS * tc->mss;
110 return TCP_MIN_RX_FIFO_SIZE;
114 * Compute initial window and scale factor. As per RFC1323, window field in
115 * SYN and SYN-ACK segments is never scaled.
118 tcp_initial_window_to_advertise (tcp_connection_t * tc)
120 tcp_main_t *tm = &tcp_main;
123 /* Initial wnd for SYN. Fifos are not allocated yet.
124 * Use some predefined value. For SYN-ACK we still want the
125 * scale to be computed in the same way */
126 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
128 /* Compute rcv wscale only if peer advertised support for it */
129 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
130 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
132 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
134 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
138 tcp_update_rcv_wnd (tcp_connection_t * tc)
141 u32 available_space, max_fifo, wnd;
144 * Figure out how much space we have available
146 available_space = transport_max_rx_enqueue (&tc->connection);
147 max_fifo = transport_rx_fifo_size (&tc->connection);
149 ASSERT (tc->rcv_opts.mss < max_fifo);
150 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
154 * Use the above and what we know about what we've previously advertised
155 * to compute the new window
157 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
158 if (observed_wnd < 0)
161 /* Bad. Thou shalt not shrink */
162 if (available_space < observed_wnd)
165 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
169 wnd = available_space;
172 /* Make sure we have a multiple of rcv_wscale */
173 if (wnd && tc->rcv_wscale)
175 wnd &= ~(1 << tc->rcv_wscale);
177 wnd = 1 << tc->rcv_wscale;
180 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
184 * Compute and return window to advertise, scaled as per RFC1323
187 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
189 if (state < TCP_STATE_ESTABLISHED)
190 return tcp_initial_window_to_advertise (tc);
192 tcp_update_rcv_wnd (tc);
194 if (tc->rcv_wnd == 0)
196 tc->flags |= TCP_CONN_SENT_RCV_WND0;
200 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
203 return tc->rcv_wnd >> tc->rcv_wscale;
207 * Write TCP options to segment.
210 tcp_options_write (u8 * data, tcp_options_t * opts)
213 u32 buf, seq_len = 4;
215 if (tcp_opts_mss (opts))
217 *data++ = TCP_OPTION_MSS;
218 *data++ = TCP_OPTION_LEN_MSS;
219 buf = clib_host_to_net_u16 (opts->mss);
220 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
221 data += sizeof (opts->mss);
222 opts_len += TCP_OPTION_LEN_MSS;
225 if (tcp_opts_wscale (opts))
227 *data++ = TCP_OPTION_WINDOW_SCALE;
228 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
229 *data++ = opts->wscale;
230 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
233 if (tcp_opts_sack_permitted (opts))
235 *data++ = TCP_OPTION_SACK_PERMITTED;
236 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
237 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
240 if (tcp_opts_tstamp (opts))
242 *data++ = TCP_OPTION_TIMESTAMP;
243 *data++ = TCP_OPTION_LEN_TIMESTAMP;
244 buf = clib_host_to_net_u32 (opts->tsval);
245 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
246 data += sizeof (opts->tsval);
247 buf = clib_host_to_net_u32 (opts->tsecr);
248 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
249 data += sizeof (opts->tsecr);
250 opts_len += TCP_OPTION_LEN_TIMESTAMP;
253 if (tcp_opts_sack (opts))
257 if (opts->n_sack_blocks != 0)
259 *data++ = TCP_OPTION_SACK_BLOCK;
260 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
261 for (i = 0; i < opts->n_sack_blocks; i++)
263 buf = clib_host_to_net_u32 (opts->sacks[i].start);
264 clib_memcpy_fast (data, &buf, seq_len);
266 buf = clib_host_to_net_u32 (opts->sacks[i].end);
267 clib_memcpy_fast (data, &buf, seq_len);
270 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
274 /* Terminate TCP options */
277 *data++ = TCP_OPTION_EOL;
278 opts_len += TCP_OPTION_LEN_EOL;
281 /* Pad with zeroes to a u32 boundary */
284 *data++ = TCP_OPTION_NOOP;
285 opts_len += TCP_OPTION_LEN_NOOP;
291 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
295 opts->flags |= TCP_OPTS_FLAG_MSS;
296 opts->mss = dummy_mtu; /*XXX discover that */
297 len += TCP_OPTION_LEN_MSS;
299 opts->flags |= TCP_OPTS_FLAG_WSCALE;
300 opts->wscale = wnd_scale;
301 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
304 opts->tsval = tcp_time_now ();
306 len += TCP_OPTION_LEN_TIMESTAMP;
310 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
311 len += TCP_OPTION_LEN_SACK_PERMITTED;
314 /* Align to needed boundary */
315 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
320 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
324 opts->flags |= TCP_OPTS_FLAG_MSS;
326 len += TCP_OPTION_LEN_MSS;
328 if (tcp_opts_wscale (&tc->rcv_opts))
330 opts->flags |= TCP_OPTS_FLAG_WSCALE;
331 opts->wscale = tc->rcv_wscale;
332 len += TCP_OPTION_LEN_WINDOW_SCALE;
335 if (tcp_opts_tstamp (&tc->rcv_opts))
337 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
338 opts->tsval = tcp_time_now ();
339 opts->tsecr = tc->tsval_recent;
340 len += TCP_OPTION_LEN_TIMESTAMP;
343 if (tcp_opts_sack_permitted (&tc->rcv_opts))
345 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
346 len += TCP_OPTION_LEN_SACK_PERMITTED;
349 /* Align to needed boundary */
350 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
355 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
361 if (tcp_opts_tstamp (&tc->rcv_opts))
363 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
364 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
365 opts->tsecr = tc->tsval_recent;
366 len += TCP_OPTION_LEN_TIMESTAMP;
368 if (tcp_opts_sack_permitted (&tc->rcv_opts))
370 if (vec_len (tc->snd_sacks))
372 opts->flags |= TCP_OPTS_FLAG_SACK;
373 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
374 tc->snd_sack_pos = 0;
375 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
376 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
377 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
378 TCP_OPTS_MAX_SACK_BLOCKS);
379 tc->snd_sack_pos += opts->n_sack_blocks;
380 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
384 /* Align to needed boundary */
385 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
390 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
395 case TCP_STATE_ESTABLISHED:
396 case TCP_STATE_CLOSE_WAIT:
397 case TCP_STATE_FIN_WAIT_1:
398 case TCP_STATE_LAST_ACK:
399 case TCP_STATE_CLOSING:
400 case TCP_STATE_FIN_WAIT_2:
401 case TCP_STATE_TIME_WAIT:
402 case TCP_STATE_CLOSED:
403 return tcp_make_established_options (tc, opts);
404 case TCP_STATE_SYN_RCVD:
405 return tcp_make_synack_options (tc, opts);
406 case TCP_STATE_SYN_SENT:
407 return tcp_make_syn_options (opts, tc->rcv_wscale);
409 clib_warning ("State not handled! %d", state);
415 * Update burst send vars
417 * - Updates snd_mss to reflect the effective segment size that we can send
418 * by taking into account all TCP options, including SACKs.
419 * - Cache 'on the wire' options for reuse
420 * - Updates receive window which can be reused for a burst.
422 * This should *only* be called when doing bursts
425 tcp_update_burst_snd_vars (tcp_connection_t * tc)
427 tcp_main_t *tm = &tcp_main;
429 /* Compute options to be used for connection. These may be reused when
430 * sending data or to compute the effective mss (snd_mss) */
431 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
432 TCP_STATE_ESTABLISHED);
434 /* XXX check if MTU has been updated */
435 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
436 ASSERT (tc->snd_mss > 0);
438 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
441 tcp_update_rcv_wnd (tc);
445 tcp_init_mss (tcp_connection_t * tc)
447 u16 default_min_mss = 536;
448 tcp_update_rcv_mss (tc);
450 /* TODO cache mss and consider PMTU discovery */
451 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
453 if (tc->snd_mss < 45)
455 /* Assume that at least the min default mss works */
456 tc->snd_mss = default_min_mss;
457 tc->rcv_opts.mss = default_min_mss;
460 /* We should have enough space for 40 bytes of options */
461 ASSERT (tc->snd_mss > 45);
463 /* If we use timestamp option, account for it */
464 if (tcp_opts_tstamp (&tc->rcv_opts))
465 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
469 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
471 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
472 vlib_buffer_free_one (vm, b->next_buffer);
473 /* Zero all flags but free list index and trace flag */
474 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
476 b->current_length = 0;
477 b->total_length_not_including_first_buffer = 0;
478 vnet_buffer (b)->tcp.flags = 0;
480 /* Leave enough space for headers */
481 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
485 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
487 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
488 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
489 b->total_length_not_including_first_buffer = 0;
491 vnet_buffer (b)->tcp.flags = 0;
492 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
493 /* Leave enough space for headers */
494 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
501 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
504 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
505 u8 tcp_opts_len, tcp_hdr_opts_len;
509 wnd = tcp_window_to_advertise (tc, state);
511 /* Make and write options */
512 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
513 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
515 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
516 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
518 tcp_options_write ((u8 *) (th + 1), snd_opts);
519 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
523 * Convert buffer to ACK
526 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
528 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
529 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
530 tc->rcv_las = tc->rcv_nxt;
534 * Convert buffer to FIN-ACK
537 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
539 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
541 /* Reset flags, make sure ack is sent */
542 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
546 * Convert buffer to SYN
549 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
551 u8 tcp_hdr_opts_len, tcp_opts_len;
554 tcp_options_t snd_opts;
556 initial_wnd = tcp_initial_window_to_advertise (tc);
558 /* Make and write options */
559 clib_memset (&snd_opts, 0, sizeof (snd_opts));
560 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
561 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
563 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
564 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
566 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
567 tcp_options_write ((u8 *) (th + 1), &snd_opts);
571 * Convert buffer to SYN-ACK
574 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
576 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
577 u8 tcp_opts_len, tcp_hdr_opts_len;
581 clib_memset (snd_opts, 0, sizeof (*snd_opts));
582 initial_wnd = tcp_initial_window_to_advertise (tc);
583 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
584 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
586 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
587 tc->rcv_nxt, tcp_hdr_opts_len,
588 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
589 tcp_options_write ((u8 *) (th + 1), snd_opts);
591 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
595 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
596 u8 is_ip4, u32 fib_index, u8 flush)
598 vlib_main_t *vm = wrk->vm;
599 u32 *to_next, next_index;
602 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
605 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
606 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
608 /* Send to IP lookup */
609 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
610 tcp_trajectory_add_start (b, 1);
612 f = wrk->ip_lookup_tx_frames[!is_ip4];
615 f = vlib_get_frame_to_node (vm, next_index);
617 wrk->ip_lookup_tx_frames[!is_ip4] = f;
620 to_next = vlib_frame_vector_args (f);
621 to_next[f->n_vectors] = bi;
623 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
625 vlib_put_frame_to_node (vm, next_index, f);
626 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
631 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
632 u32 bi, u8 is_ip4, u32 fib_index)
634 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
638 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
639 u8 is_ip4, u32 fib_index)
641 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
642 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
643 session_flush_frames_main_thread (wrk->vm);
647 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
650 u32 *to_next, next_index;
653 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
656 /* Decide where to send the packet */
657 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
658 tcp_trajectory_add_start (b, 2);
660 /* Get frame to v4/6 output node */
661 f = wrk->tx_frames[!is_ip4];
664 f = vlib_get_frame_to_node (wrk->vm, next_index);
666 wrk->tx_frames[!is_ip4] = f;
668 to_next = vlib_frame_vector_args (f);
669 to_next[f->n_vectors] = bi;
671 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
673 vlib_put_frame_to_node (wrk->vm, next_index, f);
674 wrk->tx_frames[!is_ip4] = 0;
679 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
682 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
686 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
689 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
693 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
694 tcp_state_t state, u8 thread_index, u8 is_ip4)
699 ip4_address_t src_ip40, dst_ip40;
700 ip6_address_t src_ip60, dst_ip60;
701 u16 src_port, dst_port;
706 /* Find IP and TCP headers */
707 th0 = tcp_buffer_hdr (b0);
709 /* Save src and dst ip */
712 ih4 = vlib_buffer_get_current (b0);
713 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
714 src_ip40.as_u32 = ih4->src_address.as_u32;
715 dst_ip40.as_u32 = ih4->dst_address.as_u32;
719 ih6 = vlib_buffer_get_current (b0);
720 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
721 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
722 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
725 src_port = th0->src_port;
726 dst_port = th0->dst_port;
728 /* Try to determine what/why we're actually resetting */
729 if (state == TCP_STATE_CLOSED)
734 tmp = clib_net_to_host_u32 (th0->seq_number);
736 /* Got a SYN for no listener. */
737 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
738 ack = clib_host_to_net_u32 (tmp + 1);
743 flags = TCP_FLAG_RST;
744 seq = th0->ack_number;
748 tcp_reuse_buffer (vm, b0);
749 tcp_trajectory_add_start (b0, 4);
750 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
751 sizeof (tcp_header_t), flags, 0);
755 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
757 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
762 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
764 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
772 * Send reset without reusing existing buffer
774 * It extracts connection info out of original packet
777 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
778 u32 thread_index, u8 is_ip4)
780 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
781 vlib_main_t *vm = wrk->vm;
783 u32 bi, sw_if_index, fib_index;
784 u8 tcp_hdr_len, flags = 0;
785 tcp_header_t *th, *pkt_th;
787 ip4_header_t *ih4, *pkt_ih4;
788 ip6_header_t *ih6, *pkt_ih6;
789 fib_protocol_t fib_proto;
791 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
794 b = vlib_get_buffer (vm, bi);
795 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
796 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
797 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
798 tcp_init_buffer (vm, b);
800 /* Make and write options */
801 tcp_hdr_len = sizeof (tcp_header_t);
805 pkt_ih4 = vlib_buffer_get_current (pkt);
806 pkt_th = ip4_next_header (pkt_ih4);
810 pkt_ih6 = vlib_buffer_get_current (pkt);
811 pkt_th = ip6_next_header (pkt_ih6);
814 if (tcp_ack (pkt_th))
816 flags = TCP_FLAG_RST;
817 seq = pkt_th->ack_number;
818 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
822 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
824 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
827 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
828 seq, ack, tcp_hdr_len, flags, 0);
830 /* Swap src and dst ip */
833 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
834 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
835 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
836 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
841 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
843 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
844 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
845 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
849 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
850 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
854 * Build and set reset packet for connection
857 tcp_send_reset (tcp_connection_t * tc)
859 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
860 vlib_main_t *vm = wrk->vm;
864 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
867 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
869 b = vlib_get_buffer (vm, bi);
870 tcp_init_buffer (vm, b);
872 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
873 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
874 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
875 flags = TCP_FLAG_RST;
876 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
877 tc->rcv_nxt, tcp_hdr_opts_len, flags,
879 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
880 ASSERT (opts_write_len == tc->snd_opts_len);
881 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
885 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
886 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
887 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
893 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
894 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
895 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
898 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
899 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
903 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
906 tcp_header_t *th = vlib_buffer_get_current (b);
907 vlib_main_t *vm = wrk->vm;
911 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
912 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
913 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
920 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
921 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
922 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
930 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
931 * The packet is not forwarded through tcpx_output to avoid doing lookups
932 * in the half_open pool.
935 tcp_send_syn (tcp_connection_t * tc)
937 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
938 vlib_main_t *vm = wrk->vm;
943 * Setup retransmit and establish timers before requesting buffer
944 * such that we can return if we've ran out.
946 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
947 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
948 tc->rto * TCP_TO_TIMER_TICK);
950 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
952 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
956 b = vlib_get_buffer (vm, bi);
957 tcp_init_buffer (vm, b);
958 tcp_make_syn (tc, b);
960 /* Measure RTT with this */
961 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
962 tc->rtt_seq = tc->snd_nxt;
965 tcp_push_ip_hdr (wrk, tc, b);
966 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
967 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
971 tcp_send_synack (tcp_connection_t * tc)
973 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
974 vlib_main_t *vm = wrk->vm;
978 tcp_retransmit_timer_force_update (tc);
980 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
982 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
986 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
987 b = vlib_get_buffer (vm, bi);
988 tcp_init_buffer (vm, b);
989 tcp_make_synack (tc, b);
990 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
991 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
995 * Flush tx frame populated by retransmits and timer pops
998 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1000 if (wrk->tx_frames[!is_ip4])
1003 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1004 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1005 wrk->tx_frames[!is_ip4] = 0;
1010 * Flush ip lookup tx frames populated by timer pops
1013 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1015 if (wrk->ip_lookup_tx_frames[!is_ip4])
1018 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1019 vlib_put_frame_to_node (wrk->vm, next_index,
1020 wrk->ip_lookup_tx_frames[!is_ip4]);
1021 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1026 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1029 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1031 tcp_flush_frame_to_output (wrk, 1);
1032 tcp_flush_frame_to_output (wrk, 0);
1033 tcp_flush_frame_to_ip_lookup (wrk, 1);
1034 tcp_flush_frame_to_ip_lookup (wrk, 0);
1041 tcp_send_fin (tcp_connection_t * tc)
1043 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1044 vlib_main_t *vm = wrk->vm;
1049 fin_snt = tc->flags & TCP_CONN_FINSNT;
1051 tc->snd_nxt = tc->snd_una;
1053 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1055 /* Out of buffers so program fin retransmit ASAP */
1056 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1058 tc->snd_nxt = tc->snd_una_max;
1060 /* Make sure retransmit retries a fin not data */
1061 tc->flags |= TCP_CONN_FINSNT;
1065 tcp_retransmit_timer_force_update (tc);
1066 b = vlib_get_buffer (vm, bi);
1067 tcp_init_buffer (vm, b);
1068 tcp_make_fin (tc, b);
1069 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1070 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1074 tc->flags |= TCP_CONN_FINSNT;
1075 tc->flags &= ~TCP_CONN_FINPNDG;
1076 /* Account for the FIN */
1077 tc->snd_una_max += 1;
1078 tc->snd_nxt = tc->snd_una_max;
1082 tc->snd_nxt = tc->snd_una_max;
1087 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1091 case TCP_STATE_ESTABLISHED:
1092 case TCP_STATE_CLOSE_WAIT:
1093 case TCP_STATE_TIME_WAIT:
1094 case TCP_STATE_FIN_WAIT_2:
1095 return TCP_FLAG_ACK;
1096 case TCP_STATE_SYN_RCVD:
1097 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1098 case TCP_STATE_SYN_SENT:
1099 return TCP_FLAG_SYN;
1100 case TCP_STATE_LAST_ACK:
1101 case TCP_STATE_FIN_WAIT_1:
1102 case TCP_STATE_CLOSING:
1103 if (tc->snd_nxt + 1 < tc->snd_una_max)
1104 return TCP_FLAG_ACK;
1106 return TCP_FLAG_FIN;
1108 clib_warning ("Shouldn't be here!");
1114 * Push TCP header and update connection variables
1117 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1118 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1120 u32 advertise_wnd, data_len;
1121 u8 tcp_hdr_opts_len, flags;
1122 tcp_main_t *tm = &tcp_main;
1125 data_len = b->current_length;
1126 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1127 data_len += b->total_length_not_including_first_buffer;
1129 vnet_buffer (b)->tcp.flags = 0;
1130 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1133 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1135 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1138 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1140 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1142 flags = tcp_make_state_flags (tc, next_state);
1143 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1145 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1146 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1147 flags |= TCP_FLAG_PSH;
1149 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1150 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1155 clib_memcpy_fast ((u8 *) (th + 1),
1156 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1161 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1162 ASSERT (len == tc->snd_opts_len);
1166 * Update connection variables
1169 tc->snd_nxt += data_len;
1170 tc->rcv_las = tc->rcv_nxt;
1172 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1176 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1178 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1180 tc->snd_una_max = tc->snd_nxt;
1181 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1182 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1183 /* If not tracking an ACK, start tracking */
1184 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1186 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1187 tc->rtt_seq = tc->snd_nxt;
1189 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1191 tcp_retransmit_timer_set (tc);
1194 tcp_trajectory_add_start (b, 3);
1199 tcp_send_ack (tcp_connection_t * tc)
1201 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1202 vlib_main_t *vm = wrk->vm;
1206 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1208 tcp_update_rcv_wnd (tc);
1211 b = vlib_get_buffer (vm, bi);
1212 tcp_init_buffer (vm, b);
1213 tcp_make_ack (tc, b);
1214 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1218 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1220 if (!(tc->flags & TCP_CONN_SNDACK))
1222 vec_add1 (wrk->pending_acks, tc->c_c_index);
1223 tc->flags |= TCP_CONN_SNDACK;
1228 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1230 if (!(tc->flags & TCP_CONN_SNDACK))
1232 vec_add1 (wrk->pending_acks, tc->c_c_index);
1233 tc->flags |= TCP_CONN_SNDACK;
1235 if (tc->pending_dupacks < 255)
1236 tc->pending_dupacks += 1;
1240 tcp_send_acks (tcp_worker_ctx_t * wrk)
1242 u32 thread_index, *pending_acks;
1243 tcp_connection_t *tc;
1246 if (!vec_len (wrk->pending_acks))
1249 thread_index = wrk->vm->thread_index;
1250 pending_acks = wrk->pending_acks;
1251 for (i = 0; i < vec_len (pending_acks); i++)
1253 tc = tcp_connection_get (pending_acks[i], thread_index);
1254 tc->flags &= ~TCP_CONN_SNDACK;
1255 if (!tc->pending_dupacks)
1261 /* If we're supposed to send dupacks but have no ooo data
1262 * send only one ack */
1263 if (!vec_len (tc->snd_sacks))
1269 /* Start with first sack block */
1270 tc->snd_sack_pos = 0;
1272 /* Generate enough dupacks to cover all sack blocks. Do not generate
1273 * more sacks than the number of packets received. But do generate at
1274 * least 3, i.e., the number needed to signal congestion, if needed. */
1275 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1276 n_acks = clib_min (n_acks, tc->pending_dupacks);
1277 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1278 for (j = 0; j < n_acks; j++)
1281 tc->pending_dupacks = 0;
1282 tc->snd_sack_pos = 0;
1284 _vec_len (wrk->pending_acks) = 0;
1288 * Delayed ack timer handler
1290 * Sends delayed ACK when timer expires
1293 tcp_timer_delack_handler (u32 index)
1295 u32 thread_index = vlib_get_thread_index ();
1296 tcp_connection_t *tc;
1298 tc = tcp_connection_get (index, thread_index);
1299 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1304 * Allocate a new buffer and build a new tcp segment
1306 * @param wrk tcp worker
1307 * @param tc connection for which the segment will be allocated
1308 * @param offset offset of the first byte in the tx fifo
1309 * @param max_deq_byte segment size
1310 * @param[out] b pointer to buffer allocated
1312 * @return the number of bytes in the segment or 0 if buffer cannot be
1313 * allocated or no data available
1316 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1317 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1319 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1320 vlib_main_t *vm = wrk->vm;
1325 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1330 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1333 * Allocate and fill in buffer(s)
1336 /* Easy case, buffer size greater than mss */
1337 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1339 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1341 *b = vlib_get_buffer (vm, bi);
1342 data = tcp_init_buffer (vm, *b);
1343 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1345 ASSERT (n_bytes == max_deq_bytes);
1346 b[0]->current_length = n_bytes;
1347 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1348 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1349 tc->snd_una_max = tc->snd_nxt;
1351 /* Split mss into multiple buffers */
1354 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1355 u16 n_peeked, len_to_deq;
1356 vlib_buffer_t *chain_b, *prev_b;
1359 /* Make sure we have enough buffers */
1360 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1361 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1362 CLIB_CACHE_LINE_BYTES);
1363 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1364 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1367 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1371 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1372 data = tcp_init_buffer (vm, *b);
1373 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1375 TRANSPORT_MAX_HDRS_LEN);
1376 b[0]->current_length = n_bytes;
1377 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1378 b[0]->total_length_not_including_first_buffer = 0;
1379 max_deq_bytes -= n_bytes;
1382 for (i = 1; i < n_bufs_per_seg; i++)
1385 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1386 chain_bi = wrk->tx_buffers[--n_bufs];
1387 chain_b = vlib_get_buffer (vm, chain_bi);
1388 chain_b->current_data = 0;
1389 data = vlib_buffer_get_current (chain_b);
1390 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1393 ASSERT (n_peeked == len_to_deq);
1394 n_bytes += n_peeked;
1395 chain_b->current_length = n_peeked;
1396 chain_b->next_buffer = 0;
1398 /* update previous buffer */
1399 prev_b->next_buffer = chain_bi;
1400 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1402 max_deq_bytes -= n_peeked;
1403 b[0]->total_length_not_including_first_buffer += n_peeked;
1406 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1407 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1408 tc->snd_una_max = tc->snd_nxt;
1410 if (PREDICT_FALSE (n_bufs))
1412 clib_warning ("not all buffers consumed");
1413 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1417 ASSERT (n_bytes > 0);
1418 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1424 * Build a retransmit segment
1426 * @return the number of bytes in the segment or 0 if there's nothing to
1430 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1431 tcp_connection_t * tc, u32 offset,
1432 u32 max_deq_bytes, vlib_buffer_t ** b)
1434 u32 start, available_bytes;
1437 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1438 ASSERT (max_deq_bytes != 0);
1441 * Make sure we can retransmit something
1443 available_bytes = transport_max_tx_dequeue (&tc->connection);
1444 ASSERT (available_bytes >= offset);
1445 available_bytes -= offset;
1446 if (!available_bytes)
1449 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1450 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1452 /* Start is beyond snd_congestion */
1453 start = tc->snd_una + offset;
1454 if (seq_geq (start, tc->snd_congestion))
1457 /* Don't overshoot snd_congestion */
1458 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1460 max_deq_bytes = tc->snd_congestion - start;
1461 if (max_deq_bytes == 0)
1465 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1469 if (tcp_in_fastrecovery (tc))
1470 tc->snd_rxt_bytes += n_bytes;
1473 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1478 * Reset congestion control, switch cwnd to loss window and try again.
1481 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1483 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1484 tc->prev_ssthresh = tc->ssthresh;
1485 tc->prev_cwnd = tc->cwnd;
1487 /* Cleanly recover cc (also clears up fast retransmit) */
1488 if (tcp_in_fastrecovery (tc))
1490 /* TODO be less aggressive about this */
1491 scoreboard_clear (&tc->sack_sb);
1492 tcp_cc_fastrecovery_exit (tc);
1495 tc->rcv_dupacks = 0;
1497 /* Start again from the beginning */
1498 tc->cc_algo->congestion (tc);
1499 tc->cwnd = tcp_loss_wnd (tc);
1500 tc->snd_congestion = tc->snd_una_max;
1502 tc->cwnd_acc_bytes = 0;
1503 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1504 tcp_recovery_on (tc);
1508 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1510 u32 thread_index = vlib_get_thread_index ();
1511 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1512 vlib_main_t *vm = wrk->vm;
1513 tcp_connection_t *tc;
1514 vlib_buffer_t *b = 0;
1519 tc = tcp_half_open_connection_get (index);
1520 /* Note: the connection may have transitioned to ESTABLISHED... */
1521 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1523 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1527 tc = tcp_connection_get (index, thread_index);
1528 /* Note: the connection may have been closed and pool_put */
1529 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1531 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1532 /* Wait-close and retransmit could pop at the same time */
1533 if (tc->state == TCP_STATE_CLOSED)
1537 if (tc->state >= TCP_STATE_ESTABLISHED)
1539 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1541 /* Lost FIN, retransmit and return */
1542 if (tc->flags & TCP_CONN_FINSNT)
1546 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1550 /* Shouldn't be here. This condition is tricky because it has to take
1551 * into account boff > 0 due to persist timeout. */
1552 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1553 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1554 && !tcp_flight_size (tc)))
1556 ASSERT (!tcp_in_recovery (tc));
1561 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1562 * to persist timer timeout */
1563 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1566 tcp_update_rto (tc);
1569 /* Increment RTO backoff (also equal to number of retries) and go back
1570 * to first un-acked byte */
1573 /* First retransmit timeout */
1574 if (tc->rto_boff == 1)
1575 tcp_rxt_timeout_cc (tc);
1577 scoreboard_clear (&tc->sack_sb);
1579 /* If we've sent beyond snd_congestion, update it */
1580 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1581 tc->snd_congestion = tc->snd_una_max;
1583 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1584 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1586 /* Send one segment. Note that n_bytes may be zero due to buffer
1588 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1591 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1595 bi = vlib_get_buffer_index (vm, b);
1597 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1598 if (tc->rto_boff == 1)
1599 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1601 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1602 tcp_retransmit_timer_force_update (tc);
1604 /* Retransmit for SYN */
1605 else if (tc->state == TCP_STATE_SYN_SENT)
1607 /* Half-open connection actually moved to established but we were
1608 * waiting for syn retransmit to pop to call cleanup from the right
1610 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1612 if (tcp_half_open_connection_cleanup (tc))
1613 TCP_DBG ("could not remove half-open connection");
1617 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1619 /* Try without increasing RTO a number of times. If this fails,
1620 * start growing RTO exponentially */
1622 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1623 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1625 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1626 tc->rto * TCP_TO_TIMER_TICK);
1628 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1630 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1634 b = vlib_get_buffer (vm, bi);
1635 tcp_init_buffer (vm, b);
1636 tcp_make_syn (tc, b);
1639 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1641 /* This goes straight to ipx_lookup. Retransmit timer set already */
1642 tcp_push_ip_hdr (wrk, tc, b);
1643 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1645 /* Retransmit SYN-ACK */
1646 else if (tc->state == TCP_STATE_SYN_RCVD)
1648 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1651 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1652 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1655 tcp_retransmit_timer_force_update (tc);
1657 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1659 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1663 b = vlib_get_buffer (vm, bi);
1664 tcp_init_buffer (vm, b);
1665 tcp_make_synack (tc, b);
1666 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1668 /* Retransmit timer already updated, just enqueue to output */
1669 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1673 ASSERT (tc->state == TCP_STATE_CLOSED);
1679 tcp_timer_retransmit_handler (u32 index)
1681 tcp_timer_retransmit_handler_i (index, 0);
1685 tcp_timer_retransmit_syn_handler (u32 index)
1687 tcp_timer_retransmit_handler_i (index, 1);
1691 * Got 0 snd_wnd from peer, try to do something about it.
1695 tcp_timer_persist_handler (u32 index)
1697 u32 thread_index = vlib_get_thread_index ();
1698 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1699 u32 bi, max_snd_bytes, available_bytes, offset;
1700 tcp_main_t *tm = vnet_get_tcp_main ();
1701 vlib_main_t *vm = wrk->vm;
1702 tcp_connection_t *tc;
1707 tc = tcp_connection_get_if_valid (index, thread_index);
1712 /* Make sure timer handle is set to invalid */
1713 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1715 /* Problem already solved or worse */
1716 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1717 || tc->snd_wnd > tc->snd_mss)
1720 available_bytes = transport_max_tx_dequeue (&tc->connection);
1721 offset = tc->snd_una_max - tc->snd_una;
1723 /* Reprogram persist if no new bytes available to send. We may have data
1725 if (!available_bytes)
1727 tcp_persist_timer_set (tc);
1731 if (available_bytes <= offset)
1733 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1737 /* Increment RTO backoff */
1739 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1742 * Try to force the first unsent segment (or buffer)
1744 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1746 tcp_persist_timer_set (tc);
1749 b = vlib_get_buffer (vm, bi);
1750 data = tcp_init_buffer (vm, b);
1752 tcp_validate_txf_size (tc, offset);
1753 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1755 clib_min (tc->snd_mss, tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1757 session_tx_fifo_peek_bytes (&tc->connection, data, offset, max_snd_bytes);
1758 b->current_length = n_bytes;
1759 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1760 || tc->snd_nxt == tc->snd_una_max
1761 || tc->rto_boff > 1));
1763 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1764 tc->snd_una_max = tc->snd_nxt;
1765 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1766 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1768 /* Just sent new data, enable retransmit */
1769 tcp_retransmit_timer_update (tc);
1773 * Retransmit first unacked segment
1776 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1778 u32 bi, old_snd_nxt, n_bytes;
1779 vlib_main_t *vm = wrk->vm;
1782 old_snd_nxt = tc->snd_nxt;
1783 tc->snd_nxt = tc->snd_una;
1785 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1787 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1791 bi = vlib_get_buffer_index (vm, b);
1792 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1793 tc->snd_nxt = old_snd_nxt;
1799 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1802 u32 offset, n_segs = 0, n_written, bi;
1803 vlib_main_t *vm = wrk->vm;
1804 vlib_buffer_t *b = 0;
1806 tc->snd_nxt = tc->snd_una_max;
1807 offset = tc->snd_una_max - tc->snd_una;
1808 while (n_segs < burst_size)
1810 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1814 bi = vlib_get_buffer_index (vm, b);
1815 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1816 offset += n_written;
1824 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1825 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1826 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1829 * Do fast retransmit with SACKs
1832 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1835 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1836 sack_scoreboard_hole_t *hole;
1837 vlib_main_t *vm = wrk->vm;
1838 vlib_buffer_t *b = 0;
1839 sack_scoreboard_t *sb;
1840 u32 bi, old_snd_nxt;
1843 u8 snd_limited = 0, can_rescue = 0;
1845 ASSERT (tcp_in_fastrecovery (tc));
1847 snd_space = tcp_available_cc_snd_space (tc);
1848 if (snd_space < tc->snd_mss)
1850 tcp_program_fastretransmit (wrk, tc);
1854 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1855 old_snd_nxt = tc->snd_nxt;
1857 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1859 max_deq = transport_max_tx_dequeue (&tc->connection);
1860 max_deq -= tc->snd_una_max - tc->snd_una;
1862 while (snd_space > 0 && n_segs < burst_size)
1864 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1870 snd_space = clib_min (max_deq, snd_space);
1871 burst_size = clib_min (burst_size - n_segs,
1872 snd_space / tc->snd_mss);
1873 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1874 if (max_deq > n_segs_now * tc->snd_mss)
1875 tcp_program_fastretransmit (wrk, tc);
1876 n_segs += n_segs_now;
1880 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1883 /* If rescue rxt undefined or less than snd_una then one segment of
1884 * up to SMSS octets that MUST include the highest outstanding
1885 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1886 * RecoveryPoint. HighRxt MUST NOT be updated.
1888 max_bytes = clib_min (tc->snd_mss,
1889 tc->snd_congestion - tc->snd_una);
1890 max_bytes = clib_min (max_bytes, snd_space);
1891 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1892 sb->rescue_rxt = tc->snd_congestion;
1893 tc->snd_nxt = tc->snd_una + offset;
1894 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1899 bi = vlib_get_buffer_index (vm, b);
1900 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1905 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1906 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1910 offset = sb->high_rxt - tc->snd_una;
1911 tc->snd_nxt = sb->high_rxt;
1912 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1914 ASSERT (n_written <= snd_space);
1916 /* Nothing left to retransmit */
1920 bi = vlib_get_buffer_index (vm, b);
1921 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1923 sb->high_rxt += n_written;
1924 snd_space -= n_written;
1929 tcp_program_fastretransmit (wrk, tc);
1932 /* If window allows, send 1 SMSS of new data */
1933 tc->snd_nxt = old_snd_nxt;
1938 * Fast retransmit without SACK info
1941 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1944 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1945 vlib_main_t *vm = wrk->vm;
1946 int snd_space, n_segs = 0;
1949 ASSERT (tcp_in_fastrecovery (tc));
1950 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1951 old_snd_nxt = tc->snd_nxt;
1953 if (!tcp_fastrecovery_first (tc))
1956 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1958 snd_space = tc->sack_sb.last_bytes_delivered;
1959 tc->snd_nxt = tc->snd_una;
1960 while (snd_space > 0 && n_segs < burst_size)
1962 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1965 /* Nothing left to retransmit */
1969 bi = vlib_get_buffer_index (vm, b);
1970 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1971 snd_space -= n_written;
1972 offset += n_written;
1976 if (n_segs == burst_size)
1981 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1982 snd_space = tcp_available_cc_snd_space (tc);
1983 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1986 max_deq = transport_max_tx_dequeue (&tc->connection);
1987 max_deq -= tc->snd_una_max - tc->snd_una;
1990 snd_space = clib_min (max_deq, snd_space);
1991 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1992 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1993 if (max_deq > n_segs_now * tc->snd_mss)
1994 tcp_program_fastretransmit (wrk, tc);
1995 n_segs += n_segs_now;
1998 /* Restore snd_nxt */
1999 tc->snd_nxt = old_snd_nxt;
2002 tcp_fastrecovery_first_off (tc);
2007 * Do fast retransmit
2010 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2013 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2014 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2016 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2020 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2021 u16 * next0, u32 * error0)
2023 ip_adjacency_t *adj;
2026 /* Not thread safe but as long as the connection exists the adj should
2028 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2030 if (ai == ADJ_INDEX_INVALID)
2032 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2033 *next0 = TCP_OUTPUT_NEXT_DROP;
2034 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2039 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2040 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2041 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2042 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2045 *next0 = TCP_OUTPUT_NEXT_DROP;
2046 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2048 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2052 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2053 u32 * to_next, u32 n_bufs)
2055 u32 n_trace = vlib_get_trace_count (vm, node);
2056 tcp_connection_t *tc;
2062 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2064 b = vlib_get_buffer (vm, to_next[i]);
2065 th = vlib_buffer_get_current (b);
2066 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2068 t = vlib_add_trace (vm, node, b, sizeof (*t));
2069 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2070 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2075 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2076 tcp_connection_t * tc0, u8 is_ip4)
2078 tcp_header_t *th0 = 0;
2080 th0 = vlib_buffer_get_current (b0);
2081 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2084 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2085 IP_PROTOCOL_TCP, 1);
2086 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2087 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2093 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2094 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2095 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2096 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2097 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2103 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2104 u32 * error0, u16 * next0, u8 is_ip4)
2107 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2109 *error0 = TCP_ERROR_INVALID_CONNECTION;
2110 *next0 = TCP_OUTPUT_NEXT_DROP;
2114 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2115 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2119 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2120 tcp_output_handle_link_local (tc0, b0, next0, error0);
2123 if (!TCP_ALWAYS_ACK)
2124 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2128 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2129 vlib_frame_t * frame, int is_ip4)
2131 u32 n_left_from, *from, thread_index = vm->thread_index;
2132 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2133 u16 nexts[VLIB_FRAME_SIZE], *next;
2135 from = vlib_frame_vector_args (frame);
2136 n_left_from = frame->n_vectors;
2137 tcp_set_time_now (tcp_get_worker (thread_index));
2139 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2140 tcp46_output_trace_frame (vm, node, from, n_left_from);
2142 vlib_get_buffers (vm, from, bufs, n_left_from);
2146 while (n_left_from >= 4)
2148 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2149 tcp_connection_t *tc0, *tc1;
2152 vlib_prefetch_buffer_header (b[2], STORE);
2153 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2155 vlib_prefetch_buffer_header (b[3], STORE);
2156 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2159 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2161 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2163 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2166 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2167 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2169 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2170 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2176 while (n_left_from > 0)
2178 u32 error0 = TCP_ERROR_PKTS_SENT;
2179 tcp_connection_t *tc0;
2181 if (n_left_from > 1)
2183 vlib_prefetch_buffer_header (b[1], STORE);
2184 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2187 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2188 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2191 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2192 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2199 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2200 return frame->n_vectors;
2204 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2205 vlib_frame_t * from_frame)
2207 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2211 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2212 vlib_frame_t * from_frame)
2214 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2218 VLIB_REGISTER_NODE (tcp4_output_node) =
2220 .function = tcp4_output,
2221 .name = "tcp4-output",
2222 /* Takes a vector of packets. */
2223 .vector_size = sizeof (u32),
2224 .n_errors = TCP_N_ERROR,
2225 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2226 .error_strings = tcp_error_strings,
2227 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2229 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2230 foreach_tcp4_output_next
2233 .format_buffer = format_tcp_header,
2234 .format_trace = format_tcp_tx_trace,
2238 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2241 VLIB_REGISTER_NODE (tcp6_output_node) =
2243 .function = tcp6_output,
2244 .name = "tcp6-output",
2245 /* Takes a vector of packets. */
2246 .vector_size = sizeof (u32),
2247 .n_errors = TCP_N_ERROR,
2248 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2249 .error_strings = tcp_error_strings,
2250 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2252 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2253 foreach_tcp6_output_next
2256 .format_buffer = format_tcp_header,
2257 .format_trace = format_tcp_tx_trace,
2261 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2263 typedef enum _tcp_reset_next
2265 TCP_RESET_NEXT_DROP,
2266 TCP_RESET_NEXT_IP_LOOKUP,
2270 #define foreach_tcp4_reset_next \
2271 _(DROP, "error-drop") \
2272 _(IP_LOOKUP, "ip4-lookup")
2274 #define foreach_tcp6_reset_next \
2275 _(DROP, "error-drop") \
2276 _(IP_LOOKUP, "ip6-lookup")
2279 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2280 vlib_frame_t * from_frame, u8 is_ip4)
2282 u32 n_left_from, next_index, *from, *to_next;
2283 u32 my_thread_index = vm->thread_index;
2285 from = vlib_frame_vector_args (from_frame);
2286 n_left_from = from_frame->n_vectors;
2288 next_index = node->cached_next_index;
2290 while (n_left_from > 0)
2294 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2296 while (n_left_from > 0 && n_left_to_next > 0)
2302 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2309 n_left_to_next -= 1;
2311 b0 = vlib_get_buffer (vm, bi0);
2313 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2314 my_thread_index, is_ip4))
2316 error0 = TCP_ERROR_LOOKUP_DROPS;
2317 next0 = TCP_RESET_NEXT_DROP;
2321 /* Prepare to send to IP lookup */
2322 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2323 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2326 b0->error = node->errors[error0];
2327 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2328 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2330 th0 = vlib_buffer_get_current (b0);
2332 th0 = ip4_next_header ((ip4_header_t *) th0);
2334 th0 = ip6_next_header ((ip6_header_t *) th0);
2335 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2336 clib_memcpy_fast (&t0->tcp_header, th0,
2337 sizeof (t0->tcp_header));
2340 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2341 n_left_to_next, bi0, next0);
2343 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2345 return from_frame->n_vectors;
2349 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2350 vlib_frame_t * from_frame)
2352 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2356 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2357 vlib_frame_t * from_frame)
2359 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2363 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2364 .function = tcp4_send_reset,
2365 .name = "tcp4-reset",
2366 .vector_size = sizeof (u32),
2367 .n_errors = TCP_N_ERROR,
2368 .error_strings = tcp_error_strings,
2369 .n_next_nodes = TCP_RESET_N_NEXT,
2371 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2372 foreach_tcp4_reset_next
2375 .format_trace = format_tcp_tx_trace,
2379 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2382 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2383 .function = tcp6_send_reset,
2384 .name = "tcp6-reset",
2385 .vector_size = sizeof (u32),
2386 .n_errors = TCP_N_ERROR,
2387 .error_strings = tcp_error_strings,
2388 .n_next_nodes = TCP_RESET_N_NEXT,
2390 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2391 foreach_tcp6_reset_next
2394 .format_trace = format_tcp_tx_trace,
2398 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2401 * fd.io coding-style-patch-verification: ON
2404 * eval: (c-set-style "gnu")