2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/tcp/tcp.h>
19 typedef enum _tcp_output_next
22 TCP_OUTPUT_NEXT_IP_LOOKUP,
23 TCP_OUTPUT_NEXT_IP_REWRITE,
24 TCP_OUTPUT_NEXT_IP_ARP,
28 #define foreach_tcp4_output_next \
29 _ (DROP, "error-drop") \
30 _ (IP_LOOKUP, "ip4-lookup") \
31 _ (IP_REWRITE, "ip4-rewrite") \
34 #define foreach_tcp6_output_next \
35 _ (DROP, "error-drop") \
36 _ (IP_LOOKUP, "ip6-lookup") \
37 _ (IP_REWRITE, "ip6-rewrite") \
38 _ (IP_ARP, "ip6-discover-neighbor")
40 static char *tcp_error_strings[] = {
41 #define tcp_error(n,s) s,
42 #include <vnet/tcp/tcp_error.def>
48 tcp_header_t tcp_header;
49 tcp_connection_t tcp_connection;
53 format_tcp_tx_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
58 u32 indent = format_get_indent (s);
60 s = format (s, "%U\n%U%U",
61 format_tcp_header, &t->tcp_header, 128,
62 format_white_space, indent,
63 format_tcp_connection, &t->tcp_connection, 1);
68 #ifndef CLIB_MARCH_VARIANT
70 tcp_window_compute_scale (u32 window)
73 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
79 * Update max segment size we're able to process.
81 * The value is constrained by our interface's MTU and IP options. It is
82 * also what we advertise to our peer.
85 tcp_update_rcv_mss (tcp_connection_t * tc)
87 /* TODO find our iface MTU */
88 tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t);
92 * TCP's initial window
95 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
97 /* RFC 6928 recommends the value lower. However at the time our connections
98 * are initialized, fifos may not be allocated. Therefore, advertise the
99 * smallest possible unscaled window size and update once fifos are
100 * assigned to the session.
103 tcp_update_rcv_mss (tc);
104 TCP_IW_N_SEGMENTS * tc->mss;
106 return TCP_MIN_RX_FIFO_SIZE;
110 * Compute initial window and scale factor. As per RFC1323, window field in
111 * SYN and SYN-ACK segments is never scaled.
114 tcp_initial_window_to_advertise (tcp_connection_t * tc)
116 tcp_main_t *tm = &tcp_main;
119 /* Initial wnd for SYN. Fifos are not allocated yet.
120 * Use some predefined value. For SYN-ACK we still want the
121 * scale to be computed in the same way */
122 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
124 /* Compute rcv wscale only if peer advertised support for it */
125 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
126 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
128 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
130 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
134 tcp_update_rcv_wnd (tcp_connection_t * tc)
136 u32 available_space, wnd;
139 ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection));
142 * Figure out how much space we have available
144 available_space = transport_max_rx_enqueue (&tc->connection);
145 if (PREDICT_FALSE (available_space < tc->rcv_opts.mss))
149 * Use the above and what we know about what we've previously advertised
150 * to compute the new window
152 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
154 /* Bad. Thou shalt not shrink */
155 if (PREDICT_FALSE ((i32) available_space < observed_wnd))
157 wnd = clib_max (observed_wnd, 0);
158 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
162 wnd = available_space;
165 /* Make sure we have a multiple of rcv_wscale */
166 if (wnd && tc->rcv_wscale)
168 wnd &= ~((1 << tc->rcv_wscale) - 1);
170 wnd = 1 << tc->rcv_wscale;
173 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
177 * Compute and return window to advertise, scaled as per RFC1323
180 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
182 if (state < TCP_STATE_ESTABLISHED)
183 return tcp_initial_window_to_advertise (tc);
185 tcp_update_rcv_wnd (tc);
186 return tc->rcv_wnd >> tc->rcv_wscale;
190 * Write TCP options to segment.
193 tcp_options_write (u8 * data, tcp_options_t * opts)
196 u32 buf, seq_len = 4;
198 if (tcp_opts_mss (opts))
200 *data++ = TCP_OPTION_MSS;
201 *data++ = TCP_OPTION_LEN_MSS;
202 buf = clib_host_to_net_u16 (opts->mss);
203 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
204 data += sizeof (opts->mss);
205 opts_len += TCP_OPTION_LEN_MSS;
208 if (tcp_opts_wscale (opts))
210 *data++ = TCP_OPTION_WINDOW_SCALE;
211 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
212 *data++ = opts->wscale;
213 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
216 if (tcp_opts_sack_permitted (opts))
218 *data++ = TCP_OPTION_SACK_PERMITTED;
219 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
220 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
223 if (tcp_opts_tstamp (opts))
225 *data++ = TCP_OPTION_TIMESTAMP;
226 *data++ = TCP_OPTION_LEN_TIMESTAMP;
227 buf = clib_host_to_net_u32 (opts->tsval);
228 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
229 data += sizeof (opts->tsval);
230 buf = clib_host_to_net_u32 (opts->tsecr);
231 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
232 data += sizeof (opts->tsecr);
233 opts_len += TCP_OPTION_LEN_TIMESTAMP;
236 if (tcp_opts_sack (opts))
240 if (opts->n_sack_blocks != 0)
242 *data++ = TCP_OPTION_SACK_BLOCK;
243 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
244 for (i = 0; i < opts->n_sack_blocks; i++)
246 buf = clib_host_to_net_u32 (opts->sacks[i].start);
247 clib_memcpy_fast (data, &buf, seq_len);
249 buf = clib_host_to_net_u32 (opts->sacks[i].end);
250 clib_memcpy_fast (data, &buf, seq_len);
253 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
257 /* Terminate TCP options */
260 *data++ = TCP_OPTION_EOL;
261 opts_len += TCP_OPTION_LEN_EOL;
264 /* Pad with zeroes to a u32 boundary */
267 *data++ = TCP_OPTION_NOOP;
268 opts_len += TCP_OPTION_LEN_NOOP;
274 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
278 opts->flags |= TCP_OPTS_FLAG_MSS;
279 opts->mss = tcp_main.default_mtu; /*XXX discover that */
280 len += TCP_OPTION_LEN_MSS;
282 opts->flags |= TCP_OPTS_FLAG_WSCALE;
283 opts->wscale = wnd_scale;
284 len += TCP_OPTION_LEN_WINDOW_SCALE;
286 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
287 opts->tsval = tcp_time_now ();
289 len += TCP_OPTION_LEN_TIMESTAMP;
293 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
294 len += TCP_OPTION_LEN_SACK_PERMITTED;
297 /* Align to needed boundary */
298 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
303 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
307 opts->flags |= TCP_OPTS_FLAG_MSS;
309 len += TCP_OPTION_LEN_MSS;
311 if (tcp_opts_wscale (&tc->rcv_opts))
313 opts->flags |= TCP_OPTS_FLAG_WSCALE;
314 opts->wscale = tc->rcv_wscale;
315 len += TCP_OPTION_LEN_WINDOW_SCALE;
318 if (tcp_opts_tstamp (&tc->rcv_opts))
320 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
321 opts->tsval = tcp_time_now ();
322 opts->tsecr = tc->tsval_recent;
323 len += TCP_OPTION_LEN_TIMESTAMP;
326 if (tcp_opts_sack_permitted (&tc->rcv_opts))
328 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
329 len += TCP_OPTION_LEN_SACK_PERMITTED;
332 /* Align to needed boundary */
333 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
338 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
344 if (tcp_opts_tstamp (&tc->rcv_opts))
346 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
347 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
348 opts->tsecr = tc->tsval_recent;
349 len += TCP_OPTION_LEN_TIMESTAMP;
351 if (tcp_opts_sack_permitted (&tc->rcv_opts))
353 if (vec_len (tc->snd_sacks))
355 opts->flags |= TCP_OPTS_FLAG_SACK;
356 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
357 tc->snd_sack_pos = 0;
358 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
359 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
360 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
361 TCP_OPTS_MAX_SACK_BLOCKS);
362 tc->snd_sack_pos += opts->n_sack_blocks;
363 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
367 /* Align to needed boundary */
368 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
373 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
378 case TCP_STATE_ESTABLISHED:
379 case TCP_STATE_CLOSE_WAIT:
380 case TCP_STATE_FIN_WAIT_1:
381 case TCP_STATE_LAST_ACK:
382 case TCP_STATE_CLOSING:
383 case TCP_STATE_FIN_WAIT_2:
384 case TCP_STATE_TIME_WAIT:
385 case TCP_STATE_CLOSED:
386 return tcp_make_established_options (tc, opts);
387 case TCP_STATE_SYN_RCVD:
388 return tcp_make_synack_options (tc, opts);
389 case TCP_STATE_SYN_SENT:
390 return tcp_make_syn_options (opts, tc->rcv_wscale);
392 clib_warning ("State not handled! %d", state);
398 * Update burst send vars
400 * - Updates snd_mss to reflect the effective segment size that we can send
401 * by taking into account all TCP options, including SACKs.
402 * - Cache 'on the wire' options for reuse
403 * - Updates receive window which can be reused for a burst.
405 * This should *only* be called when doing bursts
408 tcp_update_burst_snd_vars (tcp_connection_t * tc)
410 tcp_main_t *tm = &tcp_main;
412 /* Compute options to be used for connection. These may be reused when
413 * sending data or to compute the effective mss (snd_mss) */
414 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
415 TCP_STATE_ESTABLISHED);
417 /* XXX check if MTU has been updated */
418 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
419 ASSERT (tc->snd_mss > 0);
421 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
424 tcp_update_rcv_wnd (tc);
426 if (tc->flags & TCP_CONN_RATE_SAMPLE)
427 tc->flags |= TCP_CONN_TRACK_BURST;
431 tcp_init_mss (tcp_connection_t * tc)
433 u16 default_min_mss = 536;
434 tcp_update_rcv_mss (tc);
436 /* TODO cache mss and consider PMTU discovery */
437 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
439 if (tc->snd_mss < 45)
441 /* Assume that at least the min default mss works */
442 tc->snd_mss = default_min_mss;
443 tc->rcv_opts.mss = default_min_mss;
446 /* We should have enough space for 40 bytes of options */
447 ASSERT (tc->snd_mss > 45);
449 /* If we use timestamp option, account for it */
450 if (tcp_opts_tstamp (&tc->rcv_opts))
451 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
453 #endif /* CLIB_MARCH_VARIANT */
456 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
458 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
459 vlib_buffer_free_one (vm, b->next_buffer);
460 /* Zero all flags but free list index and trace flag */
461 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
463 b->current_length = 0;
464 b->total_length_not_including_first_buffer = 0;
465 vnet_buffer (b)->tcp.flags = 0;
467 /* Leave enough space for headers */
468 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
471 #ifndef CLIB_MARCH_VARIANT
473 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
475 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
476 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
477 b->total_length_not_including_first_buffer = 0;
479 vnet_buffer (b)->tcp.flags = 0;
480 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
481 /* Leave enough space for headers */
482 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
489 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
492 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
493 u8 tcp_opts_len, tcp_hdr_opts_len;
497 wnd = tcp_window_to_advertise (tc, state);
499 /* Make and write options */
500 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
501 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
503 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
504 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
506 tcp_options_write ((u8 *) (th + 1), snd_opts);
507 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
511 * Convert buffer to ACK
514 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
516 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
517 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
518 tc->rcv_las = tc->rcv_nxt;
522 * Convert buffer to FIN-ACK
525 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
527 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
531 * Convert buffer to SYN
534 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
536 u8 tcp_hdr_opts_len, tcp_opts_len;
539 tcp_options_t snd_opts;
541 initial_wnd = tcp_initial_window_to_advertise (tc);
543 /* Make and write options */
544 clib_memset (&snd_opts, 0, sizeof (snd_opts));
545 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
546 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
548 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
549 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
551 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
552 tcp_options_write ((u8 *) (th + 1), &snd_opts);
556 * Convert buffer to SYN-ACK
559 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
561 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
562 u8 tcp_opts_len, tcp_hdr_opts_len;
566 clib_memset (snd_opts, 0, sizeof (*snd_opts));
567 initial_wnd = tcp_initial_window_to_advertise (tc);
568 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
569 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
571 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
572 tc->rcv_nxt, tcp_hdr_opts_len,
573 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
574 tcp_options_write ((u8 *) (th + 1), snd_opts);
576 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
580 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
581 u8 is_ip4, u32 fib_index, u8 flush)
583 vlib_main_t *vm = wrk->vm;
584 u32 *to_next, next_index;
587 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
590 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
591 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
593 /* Send to IP lookup */
594 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
595 tcp_trajectory_add_start (b, 1);
597 f = wrk->ip_lookup_tx_frames[!is_ip4];
600 f = vlib_get_frame_to_node (vm, next_index);
602 wrk->ip_lookup_tx_frames[!is_ip4] = f;
605 to_next = vlib_frame_vector_args (f);
606 to_next[f->n_vectors] = bi;
608 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
610 vlib_put_frame_to_node (vm, next_index, f);
611 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
616 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
617 u32 bi, u8 is_ip4, u32 fib_index)
619 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
623 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
624 u8 is_ip4, u32 fib_index)
626 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
627 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
628 session_flush_frames_main_thread (wrk->vm);
632 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
635 u32 *to_next, next_index;
638 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
641 /* Decide where to send the packet */
642 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
643 tcp_trajectory_add_start (b, 2);
645 /* Get frame to v4/6 output node */
646 f = wrk->tx_frames[!is_ip4];
649 f = vlib_get_frame_to_node (wrk->vm, next_index);
651 wrk->tx_frames[!is_ip4] = f;
653 to_next = vlib_frame_vector_args (f);
654 to_next[f->n_vectors] = bi;
656 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
658 vlib_put_frame_to_node (wrk->vm, next_index, f);
659 wrk->tx_frames[!is_ip4] = 0;
664 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
667 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
671 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
674 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
676 #endif /* CLIB_MARCH_VARIANT */
679 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
680 tcp_state_t state, u8 thread_index, u8 is_ip4)
685 ip4_address_t src_ip40, dst_ip40;
686 ip6_address_t src_ip60, dst_ip60;
687 u16 src_port, dst_port;
692 /* Find IP and TCP headers */
693 th0 = tcp_buffer_hdr (b0);
695 /* Save src and dst ip */
698 ih4 = vlib_buffer_get_current (b0);
699 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
700 src_ip40.as_u32 = ih4->src_address.as_u32;
701 dst_ip40.as_u32 = ih4->dst_address.as_u32;
705 ih6 = vlib_buffer_get_current (b0);
706 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
707 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
708 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
711 src_port = th0->src_port;
712 dst_port = th0->dst_port;
714 /* Try to determine what/why we're actually resetting */
715 if (state == TCP_STATE_CLOSED)
720 tmp = clib_net_to_host_u32 (th0->seq_number);
722 /* Got a SYN for no listener. */
723 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
724 ack = clib_host_to_net_u32 (tmp + 1);
729 flags = TCP_FLAG_RST;
730 seq = th0->ack_number;
734 tcp_reuse_buffer (vm, b0);
735 tcp_trajectory_add_start (b0, 4);
736 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
737 sizeof (tcp_header_t), flags, 0);
741 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
743 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
748 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
750 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
757 #ifndef CLIB_MARCH_VARIANT
759 * Send reset without reusing existing buffer
761 * It extracts connection info out of original packet
764 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
765 u32 thread_index, u8 is_ip4)
767 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
768 vlib_main_t *vm = wrk->vm;
770 u32 bi, sw_if_index, fib_index;
771 u8 tcp_hdr_len, flags = 0;
772 tcp_header_t *th, *pkt_th;
774 ip4_header_t *ih4, *pkt_ih4;
775 ip6_header_t *ih6, *pkt_ih6;
776 fib_protocol_t fib_proto;
778 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
781 b = vlib_get_buffer (vm, bi);
782 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
783 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
784 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
785 tcp_init_buffer (vm, b);
787 /* Make and write options */
788 tcp_hdr_len = sizeof (tcp_header_t);
792 pkt_ih4 = vlib_buffer_get_current (pkt);
793 pkt_th = ip4_next_header (pkt_ih4);
797 pkt_ih6 = vlib_buffer_get_current (pkt);
798 pkt_th = ip6_next_header (pkt_ih6);
801 if (tcp_ack (pkt_th))
803 flags = TCP_FLAG_RST;
804 seq = pkt_th->ack_number;
805 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
809 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
811 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
814 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
815 seq, ack, tcp_hdr_len, flags, 0);
817 /* Swap src and dst ip */
820 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
821 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
822 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
823 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
828 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
830 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
831 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
832 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
836 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
837 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
841 * Build and set reset packet for connection
844 tcp_send_reset (tcp_connection_t * tc)
846 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
847 vlib_main_t *vm = wrk->vm;
851 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
854 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
856 b = vlib_get_buffer (vm, bi);
857 tcp_init_buffer (vm, b);
859 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
860 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
861 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
862 flags = TCP_FLAG_RST;
863 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
864 tc->rcv_nxt, tcp_hdr_opts_len, flags,
866 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
867 ASSERT (opts_write_len == tc->snd_opts_len);
868 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
872 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
873 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
874 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
880 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
881 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
882 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
885 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
886 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
890 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
893 tcp_header_t *th = vlib_buffer_get_current (b);
894 vlib_main_t *vm = wrk->vm;
898 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
899 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
900 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
907 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
908 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
909 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
917 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
918 * The packet is not forwarded through tcpx_output to avoid doing lookups
919 * in the half_open pool.
922 tcp_send_syn (tcp_connection_t * tc)
924 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
925 vlib_main_t *vm = wrk->vm;
930 * Setup retransmit and establish timers before requesting buffer
931 * such that we can return if we've ran out.
933 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
934 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
935 tc->rto * TCP_TO_TIMER_TICK);
937 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
939 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
943 b = vlib_get_buffer (vm, bi);
944 tcp_init_buffer (vm, b);
945 tcp_make_syn (tc, b);
947 /* Measure RTT with this */
948 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
949 tc->rtt_seq = tc->snd_nxt;
952 tcp_push_ip_hdr (wrk, tc, b);
953 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
954 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
958 tcp_send_synack (tcp_connection_t * tc)
960 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
961 vlib_main_t *vm = wrk->vm;
965 tcp_retransmit_timer_force_update (tc);
967 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
969 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
973 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
974 b = vlib_get_buffer (vm, bi);
975 tcp_init_buffer (vm, b);
976 tcp_make_synack (tc, b);
977 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
978 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
982 * Flush tx frame populated by retransmits and timer pops
985 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
987 if (wrk->tx_frames[!is_ip4])
990 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
991 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
992 wrk->tx_frames[!is_ip4] = 0;
997 * Flush ip lookup tx frames populated by timer pops
1000 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1002 if (wrk->ip_lookup_tx_frames[!is_ip4])
1005 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1006 vlib_put_frame_to_node (wrk->vm, next_index,
1007 wrk->ip_lookup_tx_frames[!is_ip4]);
1008 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1013 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1016 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1018 tcp_flush_frame_to_output (wrk, 1);
1019 tcp_flush_frame_to_output (wrk, 0);
1020 tcp_flush_frame_to_ip_lookup (wrk, 1);
1021 tcp_flush_frame_to_ip_lookup (wrk, 0);
1028 tcp_send_fin (tcp_connection_t * tc)
1030 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1031 vlib_main_t *vm = wrk->vm;
1036 fin_snt = tc->flags & TCP_CONN_FINSNT;
1040 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1042 /* Out of buffers so program fin retransmit ASAP */
1043 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1047 /* Make sure retransmit retries a fin not data */
1048 tc->flags |= TCP_CONN_FINSNT;
1052 tcp_retransmit_timer_force_update (tc);
1053 b = vlib_get_buffer (vm, bi);
1054 tcp_init_buffer (vm, b);
1055 tcp_make_fin (tc, b);
1056 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1057 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1058 /* Account for the FIN */
1062 tc->flags |= TCP_CONN_FINSNT;
1063 tc->flags &= ~TCP_CONN_FINPNDG;
1064 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1069 * Push TCP header and update connection variables. Should only be called
1070 * for segments with data, not for 'control' packets.
1073 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1074 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1076 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1077 u32 advertise_wnd, data_len;
1078 tcp_main_t *tm = &tcp_main;
1081 data_len = b->current_length;
1082 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1083 data_len += b->total_length_not_including_first_buffer;
1085 vnet_buffer (b)->tcp.flags = 0;
1086 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1089 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1091 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1094 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1096 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1098 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1100 if (seq_geq (tc->psh_seq, snd_nxt)
1101 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1102 flags |= TCP_FLAG_PSH;
1104 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1105 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1110 clib_memcpy_fast ((u8 *) (th + 1),
1111 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1116 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1117 ASSERT (len == tc->snd_opts_len);
1121 * Update connection variables
1125 tc->snd_nxt += data_len;
1126 tc->rcv_las = tc->rcv_nxt;
1128 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1132 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1134 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1136 if (tc->flags & TCP_CONN_TRACK_BURST)
1138 tcp_bt_check_app_limited (tc);
1139 tcp_bt_track_tx (tc);
1140 tc->flags &= ~TCP_CONN_TRACK_BURST;
1143 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1144 /* update_snd_nxt */ 1);
1146 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1147 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1148 /* If not tracking an ACK, start tracking */
1149 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1151 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1152 tc->rtt_seq = tc->snd_nxt;
1154 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1156 tcp_retransmit_timer_set (tc);
1159 tcp_trajectory_add_start (b, 3);
1164 tcp_send_ack (tcp_connection_t * tc)
1166 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1167 vlib_main_t *vm = wrk->vm;
1171 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1173 tcp_update_rcv_wnd (tc);
1176 b = vlib_get_buffer (vm, bi);
1177 tcp_init_buffer (vm, b);
1178 tcp_make_ack (tc, b);
1179 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1183 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1185 if (!(tc->flags & TCP_CONN_SNDACK))
1187 vec_add1 (wrk->pending_acks, tc->c_c_index);
1188 tc->flags |= TCP_CONN_SNDACK;
1193 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1195 if (!(tc->flags & TCP_CONN_SNDACK))
1197 vec_add1 (wrk->pending_acks, tc->c_c_index);
1198 tc->flags |= TCP_CONN_SNDACK;
1200 if (tc->pending_dupacks < 255)
1201 tc->pending_dupacks += 1;
1205 tcp_send_acks (tcp_worker_ctx_t * wrk)
1207 u32 thread_index, *pending_acks;
1208 tcp_connection_t *tc;
1211 if (!vec_len (wrk->pending_acks))
1214 thread_index = wrk->vm->thread_index;
1215 pending_acks = wrk->pending_acks;
1216 for (i = 0; i < vec_len (pending_acks); i++)
1218 tc = tcp_connection_get (pending_acks[i], thread_index);
1219 tc->flags &= ~TCP_CONN_SNDACK;
1220 if (!tc->pending_dupacks)
1226 /* If we're supposed to send dupacks but have no ooo data
1227 * send only one ack */
1228 if (!vec_len (tc->snd_sacks))
1234 /* Start with first sack block */
1235 tc->snd_sack_pos = 0;
1237 /* Generate enough dupacks to cover all sack blocks. Do not generate
1238 * more sacks than the number of packets received. But do generate at
1239 * least 3, i.e., the number needed to signal congestion, if needed. */
1240 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1241 n_acks = clib_min (n_acks, tc->pending_dupacks);
1242 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1243 for (j = 0; j < n_acks; j++)
1246 tc->pending_dupacks = 0;
1247 tc->snd_sack_pos = 0;
1249 _vec_len (wrk->pending_acks) = 0;
1253 * Delayed ack timer handler
1255 * Sends delayed ACK when timer expires
1258 tcp_timer_delack_handler (u32 index)
1260 u32 thread_index = vlib_get_thread_index ();
1261 tcp_connection_t *tc;
1263 tc = tcp_connection_get (index, thread_index);
1264 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1269 * Allocate a new buffer and build a new tcp segment
1271 * @param wrk tcp worker
1272 * @param tc connection for which the segment will be allocated
1273 * @param offset offset of the first byte in the tx fifo
1274 * @param max_deq_byte segment size
1275 * @param[out] b pointer to buffer allocated
1277 * @return the number of bytes in the segment or 0 if buffer cannot be
1278 * allocated or no data available
1281 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1282 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1284 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1285 vlib_main_t *vm = wrk->vm;
1290 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1295 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1298 * Allocate and fill in buffer(s)
1301 /* Easy case, buffer size greater than mss */
1302 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1304 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1306 *b = vlib_get_buffer (vm, bi);
1307 data = tcp_init_buffer (vm, *b);
1308 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1310 ASSERT (n_bytes == max_deq_bytes);
1311 b[0]->current_length = n_bytes;
1312 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1313 /* burst */ 0, /* update_snd_nxt */ 0);
1315 /* Split mss into multiple buffers */
1318 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1319 u16 n_peeked, len_to_deq;
1320 vlib_buffer_t *chain_b, *prev_b;
1323 /* Make sure we have enough buffers */
1324 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1325 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1326 CLIB_CACHE_LINE_BYTES);
1327 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1328 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1331 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1335 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1336 data = tcp_init_buffer (vm, *b);
1337 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1339 TRANSPORT_MAX_HDRS_LEN);
1340 b[0]->current_length = n_bytes;
1341 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1342 b[0]->total_length_not_including_first_buffer = 0;
1343 max_deq_bytes -= n_bytes;
1346 for (i = 1; i < n_bufs_per_seg; i++)
1349 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1350 chain_bi = wrk->tx_buffers[--n_bufs];
1351 chain_b = vlib_get_buffer (vm, chain_bi);
1352 chain_b->current_data = 0;
1353 data = vlib_buffer_get_current (chain_b);
1354 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1357 ASSERT (n_peeked == len_to_deq);
1358 n_bytes += n_peeked;
1359 chain_b->current_length = n_peeked;
1360 chain_b->next_buffer = 0;
1362 /* update previous buffer */
1363 prev_b->next_buffer = chain_bi;
1364 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1366 max_deq_bytes -= n_peeked;
1367 b[0]->total_length_not_including_first_buffer += n_peeked;
1370 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1371 /* burst */ 0, /* update_snd_nxt */ 0);
1373 if (PREDICT_FALSE (n_bufs))
1375 clib_warning ("not all buffers consumed");
1376 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1380 ASSERT (n_bytes > 0);
1381 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1387 * Build a retransmit segment
1389 * @return the number of bytes in the segment or 0 if there's nothing to
1393 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1394 tcp_connection_t * tc, u32 offset,
1395 u32 max_deq_bytes, vlib_buffer_t ** b)
1397 u32 start, available_bytes;
1400 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1401 ASSERT (max_deq_bytes != 0);
1404 * Make sure we can retransmit something
1406 available_bytes = transport_max_tx_dequeue (&tc->connection);
1407 ASSERT (available_bytes >= offset);
1408 available_bytes -= offset;
1409 if (!available_bytes)
1412 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1413 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1415 /* Start is beyond snd_congestion */
1416 start = tc->snd_una + offset;
1417 if (seq_geq (start, tc->snd_congestion))
1420 /* Don't overshoot snd_congestion */
1421 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1423 max_deq_bytes = tc->snd_congestion - start;
1424 if (max_deq_bytes == 0)
1428 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1432 if (tcp_in_fastrecovery (tc))
1434 tc->snd_rxt_bytes += n_bytes;
1435 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1436 tcp_bt_track_rxt (tc, start, start + n_bytes);
1440 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1445 * Reset congestion control, switch cwnd to loss window and try again.
1448 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1450 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1451 tc->prev_ssthresh = tc->ssthresh;
1452 tc->prev_cwnd = tc->cwnd;
1454 /* Cleanly recover cc (also clears up fast retransmit) */
1455 if (tcp_in_fastrecovery (tc))
1457 /* TODO be less aggressive about this */
1458 scoreboard_clear (&tc->sack_sb);
1459 tcp_cc_fastrecovery_exit (tc);
1462 tc->rcv_dupacks = 0;
1464 /* Start again from the beginning */
1465 tc->cc_algo->congestion (tc);
1466 tc->cwnd = tcp_loss_wnd (tc);
1467 tc->snd_congestion = tc->snd_nxt;
1469 tc->cwnd_acc_bytes = 0;
1470 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1471 tcp_recovery_on (tc);
1475 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1477 u32 thread_index = vlib_get_thread_index ();
1478 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1479 vlib_main_t *vm = wrk->vm;
1480 tcp_connection_t *tc;
1481 vlib_buffer_t *b = 0;
1486 tc = tcp_half_open_connection_get (index);
1487 /* Note: the connection may have transitioned to ESTABLISHED... */
1488 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1490 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1494 tc = tcp_connection_get (index, thread_index);
1495 /* Note: the connection may have been closed and pool_put */
1496 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1498 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1499 /* Wait-close and retransmit could pop at the same time */
1500 if (tc->state == TCP_STATE_CLOSED)
1504 if (tc->state >= TCP_STATE_ESTABLISHED)
1506 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1508 /* Lost FIN, retransmit and return */
1509 if (tc->flags & TCP_CONN_FINSNT)
1513 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1517 /* Shouldn't be here. This condition is tricky because it has to take
1518 * into account boff > 0 due to persist timeout. */
1519 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1520 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1521 && !tcp_flight_size (tc)))
1523 ASSERT (!tcp_in_recovery (tc));
1528 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1529 * to persist timer timeout */
1530 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1533 tcp_update_rto (tc);
1536 /* Peer is dead or network connectivity is lost. Close connection.
1537 * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For
1538 * a min rto of 0.2s we need to retry about 8 times. */
1539 if (tc->rto_boff >= TCP_RTO_BOFF_MAX)
1541 tcp_send_reset (tc);
1542 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1543 session_transport_closing_notify (&tc->connection);
1544 tcp_connection_timers_reset (tc);
1545 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
1549 /* Increment RTO backoff (also equal to number of retries) and go back
1550 * to first un-acked byte */
1553 /* First retransmit timeout */
1554 if (tc->rto_boff == 1)
1555 tcp_rxt_timeout_cc (tc);
1557 scoreboard_clear (&tc->sack_sb);
1559 if (tc->flags & TCP_CONN_RATE_SAMPLE)
1560 tcp_bt_flush_samples (tc);
1562 /* If we've sent beyond snd_congestion, update it */
1563 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1565 tc->snd_nxt = tc->snd_una;
1566 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1568 /* Send one segment. Note that n_bytes may be zero due to buffer
1570 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1573 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1577 bi = vlib_get_buffer_index (vm, b);
1579 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1580 if (tc->rto_boff == 1)
1581 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1583 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1584 tcp_retransmit_timer_force_update (tc);
1586 /* Retransmit for SYN */
1587 else if (tc->state == TCP_STATE_SYN_SENT)
1589 /* Half-open connection actually moved to established but we were
1590 * waiting for syn retransmit to pop to call cleanup from the right
1592 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1594 if (tcp_half_open_connection_cleanup (tc))
1595 TCP_DBG ("could not remove half-open connection");
1599 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1601 /* Try without increasing RTO a number of times. If this fails,
1602 * start growing RTO exponentially */
1604 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1605 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1607 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1608 tc->rto * TCP_TO_TIMER_TICK);
1610 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1612 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1616 b = vlib_get_buffer (vm, bi);
1617 tcp_init_buffer (vm, b);
1618 tcp_make_syn (tc, b);
1621 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1623 /* This goes straight to ipx_lookup. Retransmit timer set already */
1624 tcp_push_ip_hdr (wrk, tc, b);
1625 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1627 /* Retransmit SYN-ACK */
1628 else if (tc->state == TCP_STATE_SYN_RCVD)
1630 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1633 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1634 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1637 tcp_retransmit_timer_force_update (tc);
1639 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1641 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1645 b = vlib_get_buffer (vm, bi);
1646 tcp_init_buffer (vm, b);
1647 tcp_make_synack (tc, b);
1648 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1650 /* Retransmit timer already updated, just enqueue to output */
1651 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1655 ASSERT (tc->state == TCP_STATE_CLOSED);
1661 tcp_timer_retransmit_handler (u32 index)
1663 tcp_timer_retransmit_handler_i (index, 0);
1667 tcp_timer_retransmit_syn_handler (u32 index)
1669 tcp_timer_retransmit_handler_i (index, 1);
1673 * Got 0 snd_wnd from peer, try to do something about it.
1677 tcp_timer_persist_handler (u32 index)
1679 u32 thread_index = vlib_get_thread_index ();
1680 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1681 u32 bi, max_snd_bytes, available_bytes, offset;
1682 tcp_main_t *tm = vnet_get_tcp_main ();
1683 vlib_main_t *vm = wrk->vm;
1684 tcp_connection_t *tc;
1689 tc = tcp_connection_get_if_valid (index, thread_index);
1693 /* Make sure timer handle is set to invalid */
1694 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1696 /* Problem already solved or worse */
1697 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1698 || (tc->flags & TCP_CONN_FINSNT))
1701 available_bytes = transport_max_tx_dequeue (&tc->connection);
1702 offset = tc->snd_nxt - tc->snd_una;
1704 /* Reprogram persist if no new bytes available to send. We may have data
1706 if (!available_bytes)
1708 tcp_persist_timer_set (tc);
1712 if (available_bytes <= offset)
1714 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1718 /* Increment RTO backoff */
1720 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1723 * Try to force the first unsent segment (or buffer)
1725 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1727 tcp_persist_timer_set (tc);
1730 b = vlib_get_buffer (vm, bi);
1731 data = tcp_init_buffer (vm, b);
1733 tcp_validate_txf_size (tc, offset);
1734 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1735 max_snd_bytes = clib_min (tc->snd_mss,
1736 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1737 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1739 b->current_length = n_bytes;
1740 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1741 || tc->snd_nxt == tc->snd_una_max
1742 || tc->rto_boff > 1));
1744 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1745 /* burst */ 0, /* update_snd_nxt */ 1);
1746 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1747 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1748 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1750 /* Just sent new data, enable retransmit */
1751 tcp_retransmit_timer_update (tc);
1755 * Retransmit first unacked segment
1758 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1760 vlib_main_t *vm = wrk->vm;
1764 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1766 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1770 bi = vlib_get_buffer_index (vm, b);
1771 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1777 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1780 u32 offset, n_segs = 0, n_written, bi;
1781 vlib_main_t *vm = wrk->vm;
1782 vlib_buffer_t *b = 0;
1784 offset = tc->snd_nxt - tc->snd_una;
1785 while (n_segs < burst_size)
1787 n_written = tcp_prepare_segment (wrk, tc, offset, 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 offset += n_written;
1796 tc->snd_nxt += n_written;
1797 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1804 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1805 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1806 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1809 * Do fast retransmit with SACKs
1812 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1815 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1816 sack_scoreboard_hole_t *hole;
1817 vlib_main_t *vm = wrk->vm;
1818 vlib_buffer_t *b = 0;
1819 sack_scoreboard_t *sb;
1822 u8 snd_limited = 0, can_rescue = 0;
1824 ASSERT (tcp_in_fastrecovery (tc));
1826 snd_space = tcp_available_cc_snd_space (tc);
1827 if (snd_space < tc->snd_mss)
1829 tcp_program_fastretransmit (wrk, tc);
1833 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1835 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1837 max_deq = transport_max_tx_dequeue (&tc->connection);
1838 max_deq -= tc->snd_nxt - tc->snd_una;
1840 while (snd_space > 0 && n_segs < burst_size)
1842 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1848 snd_space = clib_min (max_deq, snd_space);
1849 burst_size = clib_min (burst_size - n_segs,
1850 snd_space / tc->snd_mss);
1851 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1852 if (max_deq > n_segs_now * tc->snd_mss)
1853 tcp_program_fastretransmit (wrk, tc);
1854 n_segs += n_segs_now;
1858 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1861 /* If rescue rxt undefined or less than snd_una then one segment of
1862 * up to SMSS octets that MUST include the highest outstanding
1863 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1864 * RecoveryPoint. HighRxt MUST NOT be updated.
1866 max_bytes = clib_min (tc->snd_mss,
1867 tc->snd_congestion - tc->snd_una);
1868 max_bytes = clib_min (max_bytes, snd_space);
1869 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1870 sb->rescue_rxt = tc->snd_congestion;
1871 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1876 bi = vlib_get_buffer_index (vm, b);
1877 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1882 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1883 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1887 offset = sb->high_rxt - tc->snd_una;
1888 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1890 ASSERT (n_written <= snd_space);
1892 /* Nothing left to retransmit */
1896 bi = vlib_get_buffer_index (vm, b);
1897 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1899 sb->high_rxt += n_written;
1900 snd_space -= n_written;
1905 tcp_program_fastretransmit (wrk, tc);
1912 * Fast retransmit without SACK info
1915 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1918 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1919 vlib_main_t *vm = wrk->vm;
1920 int snd_space, n_segs = 0;
1923 ASSERT (tcp_in_fastrecovery (tc));
1924 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1926 snd_space = tcp_available_cc_snd_space (tc);
1928 if (!tcp_fastrecovery_first (tc))
1931 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1933 while (snd_space > 0 && n_segs < burst_size)
1935 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1938 /* Nothing left to retransmit */
1942 bi = vlib_get_buffer_index (vm, b);
1943 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1944 snd_space -= n_written;
1945 offset += n_written;
1949 if (n_segs == burst_size)
1954 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1955 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1958 max_deq = transport_max_tx_dequeue (&tc->connection);
1959 max_deq -= tc->snd_nxt - tc->snd_una;
1962 snd_space = clib_min (max_deq, snd_space);
1963 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1964 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1965 if (max_deq > n_segs_now * tc->snd_mss)
1966 tcp_program_fastretransmit (wrk, tc);
1967 n_segs += n_segs_now;
1971 tcp_fastrecovery_first_off (tc);
1976 * Do fast retransmit
1979 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1982 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1983 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1985 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1987 #endif /* CLIB_MARCH_VARIANT */
1990 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1991 u16 * next0, u32 * error0)
1993 ip_adjacency_t *adj;
1996 /* Not thread safe but as long as the connection exists the adj should
1998 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2000 if (ai == ADJ_INDEX_INVALID)
2002 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2003 *next0 = TCP_OUTPUT_NEXT_DROP;
2004 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2009 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2010 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2011 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2012 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2015 *next0 = TCP_OUTPUT_NEXT_DROP;
2016 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2018 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2022 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2023 u32 * to_next, u32 n_bufs)
2025 u32 n_trace = vlib_get_trace_count (vm, node);
2026 tcp_connection_t *tc;
2032 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2034 b = vlib_get_buffer (vm, to_next[i]);
2035 th = vlib_buffer_get_current (b);
2036 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2038 t = vlib_add_trace (vm, node, b, sizeof (*t));
2039 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2040 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2045 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2046 tcp_connection_t * tc0, u8 is_ip4)
2048 tcp_header_t *th0 = 0;
2050 th0 = vlib_buffer_get_current (b0);
2051 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2054 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2055 IP_PROTOCOL_TCP, 1);
2056 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2057 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2063 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2064 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2065 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2066 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2067 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2073 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2074 u32 * error0, u16 * next0, u8 is_ip4)
2077 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2079 *error0 = TCP_ERROR_INVALID_CONNECTION;
2080 *next0 = TCP_OUTPUT_NEXT_DROP;
2084 /* If next_index is not drop use it */
2085 if (tc0->next_node_index)
2087 *next0 = tc0->next_node_index;
2088 vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
2091 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2092 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2096 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2097 tcp_output_handle_link_local (tc0, b0, next0, error0);
2100 if (!TCP_ALWAYS_ACK)
2101 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2105 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2106 vlib_frame_t * frame, int is_ip4)
2108 u32 n_left_from, *from, thread_index = vm->thread_index;
2109 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2110 u16 nexts[VLIB_FRAME_SIZE], *next;
2112 from = vlib_frame_vector_args (frame);
2113 n_left_from = frame->n_vectors;
2114 tcp_set_time_now (tcp_get_worker (thread_index));
2116 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2117 tcp46_output_trace_frame (vm, node, from, n_left_from);
2119 vlib_get_buffers (vm, from, bufs, n_left_from);
2123 while (n_left_from >= 4)
2125 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2126 tcp_connection_t *tc0, *tc1;
2129 vlib_prefetch_buffer_header (b[2], STORE);
2130 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2132 vlib_prefetch_buffer_header (b[3], STORE);
2133 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2136 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2138 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2140 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2143 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2144 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2146 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2147 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2153 while (n_left_from > 0)
2155 u32 error0 = TCP_ERROR_PKTS_SENT;
2156 tcp_connection_t *tc0;
2158 if (n_left_from > 1)
2160 vlib_prefetch_buffer_header (b[1], STORE);
2161 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2164 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2165 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2168 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2169 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2176 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2177 return frame->n_vectors;
2180 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2181 vlib_frame_t * from_frame)
2183 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2186 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2187 vlib_frame_t * from_frame)
2189 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2193 VLIB_REGISTER_NODE (tcp4_output_node) =
2195 .name = "tcp4-output",
2196 /* Takes a vector of packets. */
2197 .vector_size = sizeof (u32),
2198 .n_errors = TCP_N_ERROR,
2199 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2200 .error_strings = tcp_error_strings,
2201 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2203 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2204 foreach_tcp4_output_next
2207 .format_buffer = format_tcp_header,
2208 .format_trace = format_tcp_tx_trace,
2213 VLIB_REGISTER_NODE (tcp6_output_node) =
2215 .name = "tcp6-output",
2216 /* Takes a vector of packets. */
2217 .vector_size = sizeof (u32),
2218 .n_errors = TCP_N_ERROR,
2219 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2220 .error_strings = tcp_error_strings,
2221 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2223 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2224 foreach_tcp6_output_next
2227 .format_buffer = format_tcp_header,
2228 .format_trace = format_tcp_tx_trace,
2232 typedef enum _tcp_reset_next
2234 TCP_RESET_NEXT_DROP,
2235 TCP_RESET_NEXT_IP_LOOKUP,
2239 #define foreach_tcp4_reset_next \
2240 _(DROP, "error-drop") \
2241 _(IP_LOOKUP, "ip4-lookup")
2243 #define foreach_tcp6_reset_next \
2244 _(DROP, "error-drop") \
2245 _(IP_LOOKUP, "ip6-lookup")
2248 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2249 vlib_frame_t * from_frame, u8 is_ip4)
2251 u32 n_left_from, next_index, *from, *to_next;
2252 u32 my_thread_index = vm->thread_index;
2254 from = vlib_frame_vector_args (from_frame);
2255 n_left_from = from_frame->n_vectors;
2257 next_index = node->cached_next_index;
2259 while (n_left_from > 0)
2263 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2265 while (n_left_from > 0 && n_left_to_next > 0)
2271 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2278 n_left_to_next -= 1;
2280 b0 = vlib_get_buffer (vm, bi0);
2282 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2283 my_thread_index, is_ip4))
2285 error0 = TCP_ERROR_LOOKUP_DROPS;
2286 next0 = TCP_RESET_NEXT_DROP;
2290 /* Prepare to send to IP lookup */
2291 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2292 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2295 b0->error = node->errors[error0];
2296 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2297 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2299 th0 = vlib_buffer_get_current (b0);
2301 th0 = ip4_next_header ((ip4_header_t *) th0);
2303 th0 = ip6_next_header ((ip6_header_t *) th0);
2304 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2305 clib_memcpy_fast (&t0->tcp_header, th0,
2306 sizeof (t0->tcp_header));
2309 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2310 n_left_to_next, bi0, next0);
2312 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2314 return from_frame->n_vectors;
2317 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2318 vlib_frame_t * from_frame)
2320 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2323 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2324 vlib_frame_t * from_frame)
2326 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2330 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2331 .name = "tcp4-reset",
2332 .vector_size = sizeof (u32),
2333 .n_errors = TCP_N_ERROR,
2334 .error_strings = tcp_error_strings,
2335 .n_next_nodes = TCP_RESET_N_NEXT,
2337 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2338 foreach_tcp4_reset_next
2341 .format_trace = format_tcp_tx_trace,
2346 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2347 .name = "tcp6-reset",
2348 .vector_size = sizeof (u32),
2349 .n_errors = TCP_N_ERROR,
2350 .error_strings = tcp_error_strings,
2351 .n_next_nodes = TCP_RESET_N_NEXT,
2353 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2354 foreach_tcp6_reset_next
2357 .format_trace = format_tcp_tx_trace,
2362 * fd.io coding-style-patch-verification: ON
2365 * eval: (c-set-style "gnu")