2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/tcp/tcp.h>
19 typedef enum _tcp_output_next
22 TCP_OUTPUT_NEXT_IP_LOOKUP,
23 TCP_OUTPUT_NEXT_IP_REWRITE,
24 TCP_OUTPUT_NEXT_IP_ARP,
28 #define foreach_tcp4_output_next \
29 _ (DROP, "error-drop") \
30 _ (IP_LOOKUP, "ip4-lookup") \
31 _ (IP_REWRITE, "ip4-rewrite") \
34 #define foreach_tcp6_output_next \
35 _ (DROP, "error-drop") \
36 _ (IP_LOOKUP, "ip6-lookup") \
37 _ (IP_REWRITE, "ip6-rewrite") \
38 _ (IP_ARP, "ip6-discover-neighbor")
40 static char *tcp_error_strings[] = {
41 #define tcp_error(n,s) s,
42 #include <vnet/tcp/tcp_error.def>
48 tcp_header_t tcp_header;
49 tcp_connection_t tcp_connection;
53 format_tcp_tx_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
58 u32 indent = format_get_indent (s);
60 s = format (s, "%U\n%U%U",
61 format_tcp_header, &t->tcp_header, 128,
62 format_white_space, indent,
63 format_tcp_connection, &t->tcp_connection, 1);
68 #ifndef CLIB_MARCH_VARIANT
70 tcp_window_compute_scale (u32 window)
73 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
79 * Update max segment size we're able to process.
81 * The value is constrained by our interface's MTU and IP options. It is
82 * also what we advertise to our peer.
85 tcp_update_rcv_mss (tcp_connection_t * tc)
87 /* TODO find our iface MTU */
88 tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t);
92 * TCP's initial window
95 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
97 /* RFC 6928 recommends the value lower. However at the time our connections
98 * are initialized, fifos may not be allocated. Therefore, advertise the
99 * smallest possible unscaled window size and update once fifos are
100 * assigned to the session.
103 tcp_update_rcv_mss (tc);
104 TCP_IW_N_SEGMENTS * tc->mss;
106 return TCP_MIN_RX_FIFO_SIZE;
110 * Compute initial window and scale factor. As per RFC1323, window field in
111 * SYN and SYN-ACK segments is never scaled.
114 tcp_initial_window_to_advertise (tcp_connection_t * tc)
116 tcp_main_t *tm = &tcp_main;
119 /* Initial wnd for SYN. Fifos are not allocated yet.
120 * Use some predefined value. For SYN-ACK we still want the
121 * scale to be computed in the same way */
122 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
124 /* Compute rcv wscale only if peer advertised support for it */
125 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
126 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
128 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
130 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
134 tcp_update_rcv_wnd (tcp_connection_t * tc)
137 u32 available_space, max_fifo, wnd;
140 * Figure out how much space we have available
142 available_space = transport_max_rx_enqueue (&tc->connection);
143 max_fifo = transport_rx_fifo_size (&tc->connection);
145 ASSERT (tc->rcv_opts.mss < max_fifo);
146 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
150 * Use the above and what we know about what we've previously advertised
151 * to compute the new window
153 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
154 if (observed_wnd < 0)
157 /* Bad. Thou shalt not shrink */
158 if (available_space < observed_wnd)
161 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
165 wnd = available_space;
168 /* Make sure we have a multiple of rcv_wscale */
169 if (wnd && tc->rcv_wscale)
171 wnd &= ~((1 << tc->rcv_wscale) - 1);
173 wnd = 1 << tc->rcv_wscale;
176 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
180 * Compute and return window to advertise, scaled as per RFC1323
183 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
185 if (state < TCP_STATE_ESTABLISHED)
186 return tcp_initial_window_to_advertise (tc);
188 tcp_update_rcv_wnd (tc);
190 if (tc->rcv_wnd == 0)
192 tc->flags |= TCP_CONN_SENT_RCV_WND0;
196 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
199 return tc->rcv_wnd >> tc->rcv_wscale;
203 * Write TCP options to segment.
206 tcp_options_write (u8 * data, tcp_options_t * opts)
209 u32 buf, seq_len = 4;
211 if (tcp_opts_mss (opts))
213 *data++ = TCP_OPTION_MSS;
214 *data++ = TCP_OPTION_LEN_MSS;
215 buf = clib_host_to_net_u16 (opts->mss);
216 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
217 data += sizeof (opts->mss);
218 opts_len += TCP_OPTION_LEN_MSS;
221 if (tcp_opts_wscale (opts))
223 *data++ = TCP_OPTION_WINDOW_SCALE;
224 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
225 *data++ = opts->wscale;
226 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
229 if (tcp_opts_sack_permitted (opts))
231 *data++ = TCP_OPTION_SACK_PERMITTED;
232 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
233 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
236 if (tcp_opts_tstamp (opts))
238 *data++ = TCP_OPTION_TIMESTAMP;
239 *data++ = TCP_OPTION_LEN_TIMESTAMP;
240 buf = clib_host_to_net_u32 (opts->tsval);
241 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
242 data += sizeof (opts->tsval);
243 buf = clib_host_to_net_u32 (opts->tsecr);
244 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
245 data += sizeof (opts->tsecr);
246 opts_len += TCP_OPTION_LEN_TIMESTAMP;
249 if (tcp_opts_sack (opts))
253 if (opts->n_sack_blocks != 0)
255 *data++ = TCP_OPTION_SACK_BLOCK;
256 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
257 for (i = 0; i < opts->n_sack_blocks; i++)
259 buf = clib_host_to_net_u32 (opts->sacks[i].start);
260 clib_memcpy_fast (data, &buf, seq_len);
262 buf = clib_host_to_net_u32 (opts->sacks[i].end);
263 clib_memcpy_fast (data, &buf, seq_len);
266 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
270 /* Terminate TCP options */
273 *data++ = TCP_OPTION_EOL;
274 opts_len += TCP_OPTION_LEN_EOL;
277 /* Pad with zeroes to a u32 boundary */
280 *data++ = TCP_OPTION_NOOP;
281 opts_len += TCP_OPTION_LEN_NOOP;
287 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
291 opts->flags |= TCP_OPTS_FLAG_MSS;
292 opts->mss = tcp_main.default_mtu; /*XXX discover that */
293 len += TCP_OPTION_LEN_MSS;
295 opts->flags |= TCP_OPTS_FLAG_WSCALE;
296 opts->wscale = wnd_scale;
297 len += TCP_OPTION_LEN_WINDOW_SCALE;
299 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
300 opts->tsval = tcp_time_now ();
302 len += TCP_OPTION_LEN_TIMESTAMP;
306 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
307 len += TCP_OPTION_LEN_SACK_PERMITTED;
310 /* Align to needed boundary */
311 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
316 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
320 opts->flags |= TCP_OPTS_FLAG_MSS;
322 len += TCP_OPTION_LEN_MSS;
324 if (tcp_opts_wscale (&tc->rcv_opts))
326 opts->flags |= TCP_OPTS_FLAG_WSCALE;
327 opts->wscale = tc->rcv_wscale;
328 len += TCP_OPTION_LEN_WINDOW_SCALE;
331 if (tcp_opts_tstamp (&tc->rcv_opts))
333 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
334 opts->tsval = tcp_time_now ();
335 opts->tsecr = tc->tsval_recent;
336 len += TCP_OPTION_LEN_TIMESTAMP;
339 if (tcp_opts_sack_permitted (&tc->rcv_opts))
341 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
342 len += TCP_OPTION_LEN_SACK_PERMITTED;
345 /* Align to needed boundary */
346 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
351 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
357 if (tcp_opts_tstamp (&tc->rcv_opts))
359 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
360 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
361 opts->tsecr = tc->tsval_recent;
362 len += TCP_OPTION_LEN_TIMESTAMP;
364 if (tcp_opts_sack_permitted (&tc->rcv_opts))
366 if (vec_len (tc->snd_sacks))
368 opts->flags |= TCP_OPTS_FLAG_SACK;
369 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
370 tc->snd_sack_pos = 0;
371 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
372 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
373 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
374 TCP_OPTS_MAX_SACK_BLOCKS);
375 tc->snd_sack_pos += opts->n_sack_blocks;
376 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
380 /* Align to needed boundary */
381 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
386 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
391 case TCP_STATE_ESTABLISHED:
392 case TCP_STATE_CLOSE_WAIT:
393 case TCP_STATE_FIN_WAIT_1:
394 case TCP_STATE_LAST_ACK:
395 case TCP_STATE_CLOSING:
396 case TCP_STATE_FIN_WAIT_2:
397 case TCP_STATE_TIME_WAIT:
398 case TCP_STATE_CLOSED:
399 return tcp_make_established_options (tc, opts);
400 case TCP_STATE_SYN_RCVD:
401 return tcp_make_synack_options (tc, opts);
402 case TCP_STATE_SYN_SENT:
403 return tcp_make_syn_options (opts, tc->rcv_wscale);
405 clib_warning ("State not handled! %d", state);
411 * Update burst send vars
413 * - Updates snd_mss to reflect the effective segment size that we can send
414 * by taking into account all TCP options, including SACKs.
415 * - Cache 'on the wire' options for reuse
416 * - Updates receive window which can be reused for a burst.
418 * This should *only* be called when doing bursts
421 tcp_update_burst_snd_vars (tcp_connection_t * tc)
423 tcp_main_t *tm = &tcp_main;
425 /* Compute options to be used for connection. These may be reused when
426 * sending data or to compute the effective mss (snd_mss) */
427 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
428 TCP_STATE_ESTABLISHED);
430 /* XXX check if MTU has been updated */
431 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
432 ASSERT (tc->snd_mss > 0);
434 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
437 tcp_update_rcv_wnd (tc);
441 tcp_init_mss (tcp_connection_t * tc)
443 u16 default_min_mss = 536;
444 tcp_update_rcv_mss (tc);
446 /* TODO cache mss and consider PMTU discovery */
447 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
449 if (tc->snd_mss < 45)
451 /* Assume that at least the min default mss works */
452 tc->snd_mss = default_min_mss;
453 tc->rcv_opts.mss = default_min_mss;
456 /* We should have enough space for 40 bytes of options */
457 ASSERT (tc->snd_mss > 45);
459 /* If we use timestamp option, account for it */
460 if (tcp_opts_tstamp (&tc->rcv_opts))
461 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
463 #endif /* CLIB_MARCH_VARIANT */
466 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
468 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
469 vlib_buffer_free_one (vm, b->next_buffer);
470 /* Zero all flags but free list index and trace flag */
471 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
473 b->current_length = 0;
474 b->total_length_not_including_first_buffer = 0;
475 vnet_buffer (b)->tcp.flags = 0;
477 /* Leave enough space for headers */
478 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
481 #ifndef CLIB_MARCH_VARIANT
483 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
485 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
486 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
487 b->total_length_not_including_first_buffer = 0;
489 vnet_buffer (b)->tcp.flags = 0;
490 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
491 /* Leave enough space for headers */
492 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
499 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
502 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
503 u8 tcp_opts_len, tcp_hdr_opts_len;
507 wnd = tcp_window_to_advertise (tc, state);
509 /* Make and write options */
510 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
511 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
513 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
514 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
516 tcp_options_write ((u8 *) (th + 1), snd_opts);
517 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
521 * Convert buffer to ACK
524 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
526 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
527 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
528 tc->rcv_las = tc->rcv_nxt;
532 * Convert buffer to FIN-ACK
535 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
537 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
539 /* Reset flags, make sure ack is sent */
540 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
544 * Convert buffer to SYN
547 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
549 u8 tcp_hdr_opts_len, tcp_opts_len;
552 tcp_options_t snd_opts;
554 initial_wnd = tcp_initial_window_to_advertise (tc);
556 /* Make and write options */
557 clib_memset (&snd_opts, 0, sizeof (snd_opts));
558 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
559 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
561 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
562 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
564 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
565 tcp_options_write ((u8 *) (th + 1), &snd_opts);
569 * Convert buffer to SYN-ACK
572 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
574 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
575 u8 tcp_opts_len, tcp_hdr_opts_len;
579 clib_memset (snd_opts, 0, sizeof (*snd_opts));
580 initial_wnd = tcp_initial_window_to_advertise (tc);
581 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
582 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
584 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
585 tc->rcv_nxt, tcp_hdr_opts_len,
586 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
587 tcp_options_write ((u8 *) (th + 1), snd_opts);
589 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
593 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
594 u8 is_ip4, u32 fib_index, u8 flush)
596 vlib_main_t *vm = wrk->vm;
597 u32 *to_next, next_index;
600 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
603 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
604 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
606 /* Send to IP lookup */
607 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
608 tcp_trajectory_add_start (b, 1);
610 f = wrk->ip_lookup_tx_frames[!is_ip4];
613 f = vlib_get_frame_to_node (vm, next_index);
615 wrk->ip_lookup_tx_frames[!is_ip4] = f;
618 to_next = vlib_frame_vector_args (f);
619 to_next[f->n_vectors] = bi;
621 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
623 vlib_put_frame_to_node (vm, next_index, f);
624 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
629 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
630 u32 bi, u8 is_ip4, u32 fib_index)
632 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
636 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
637 u8 is_ip4, u32 fib_index)
639 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
640 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
641 session_flush_frames_main_thread (wrk->vm);
645 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
648 u32 *to_next, next_index;
651 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
654 /* Decide where to send the packet */
655 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
656 tcp_trajectory_add_start (b, 2);
658 /* Get frame to v4/6 output node */
659 f = wrk->tx_frames[!is_ip4];
662 f = vlib_get_frame_to_node (wrk->vm, next_index);
664 wrk->tx_frames[!is_ip4] = f;
666 to_next = vlib_frame_vector_args (f);
667 to_next[f->n_vectors] = bi;
669 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
671 vlib_put_frame_to_node (wrk->vm, next_index, f);
672 wrk->tx_frames[!is_ip4] = 0;
677 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
680 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
684 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
687 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
689 #endif /* CLIB_MARCH_VARIANT */
692 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
693 tcp_state_t state, u8 thread_index, u8 is_ip4)
698 ip4_address_t src_ip40, dst_ip40;
699 ip6_address_t src_ip60, dst_ip60;
700 u16 src_port, dst_port;
705 /* Find IP and TCP headers */
706 th0 = tcp_buffer_hdr (b0);
708 /* Save src and dst ip */
711 ih4 = vlib_buffer_get_current (b0);
712 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
713 src_ip40.as_u32 = ih4->src_address.as_u32;
714 dst_ip40.as_u32 = ih4->dst_address.as_u32;
718 ih6 = vlib_buffer_get_current (b0);
719 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
720 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
721 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
724 src_port = th0->src_port;
725 dst_port = th0->dst_port;
727 /* Try to determine what/why we're actually resetting */
728 if (state == TCP_STATE_CLOSED)
733 tmp = clib_net_to_host_u32 (th0->seq_number);
735 /* Got a SYN for no listener. */
736 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
737 ack = clib_host_to_net_u32 (tmp + 1);
742 flags = TCP_FLAG_RST;
743 seq = th0->ack_number;
747 tcp_reuse_buffer (vm, b0);
748 tcp_trajectory_add_start (b0, 4);
749 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
750 sizeof (tcp_header_t), flags, 0);
754 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
756 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
761 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
763 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
770 #ifndef CLIB_MARCH_VARIANT
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;
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);
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);
1071 /* Account for the FIN */
1075 tc->flags |= TCP_CONN_FINSNT;
1076 tc->flags &= ~TCP_CONN_FINPNDG;
1077 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1082 * Push TCP header and update connection variables. Should only be called
1083 * for segments with data, not for 'control' packets.
1086 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1087 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1089 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1090 u32 advertise_wnd, data_len;
1091 tcp_main_t *tm = &tcp_main;
1094 data_len = b->current_length;
1095 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1096 data_len += b->total_length_not_including_first_buffer;
1098 vnet_buffer (b)->tcp.flags = 0;
1099 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1102 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1104 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1107 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1109 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1111 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1113 if (seq_geq (tc->psh_seq, snd_nxt)
1114 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1115 flags |= TCP_FLAG_PSH;
1117 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1118 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1123 clib_memcpy_fast ((u8 *) (th + 1),
1124 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1129 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1130 ASSERT (len == tc->snd_opts_len);
1134 * Update connection variables
1138 tc->snd_nxt += data_len;
1139 tc->rcv_las = tc->rcv_nxt;
1141 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1145 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1147 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1148 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1149 /* update_snd_nxt */ 1);
1150 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1151 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1152 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1153 /* If not tracking an ACK, start tracking */
1154 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1156 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1157 tc->rtt_seq = tc->snd_nxt;
1159 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1161 tcp_retransmit_timer_set (tc);
1164 tcp_trajectory_add_start (b, 3);
1169 tcp_send_ack (tcp_connection_t * tc)
1171 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1172 vlib_main_t *vm = wrk->vm;
1176 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1178 tcp_update_rcv_wnd (tc);
1181 b = vlib_get_buffer (vm, bi);
1182 tcp_init_buffer (vm, b);
1183 tcp_make_ack (tc, b);
1184 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1188 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1190 if (!(tc->flags & TCP_CONN_SNDACK))
1192 vec_add1 (wrk->pending_acks, tc->c_c_index);
1193 tc->flags |= TCP_CONN_SNDACK;
1198 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1200 if (!(tc->flags & TCP_CONN_SNDACK))
1202 vec_add1 (wrk->pending_acks, tc->c_c_index);
1203 tc->flags |= TCP_CONN_SNDACK;
1205 if (tc->pending_dupacks < 255)
1206 tc->pending_dupacks += 1;
1210 tcp_send_acks (tcp_worker_ctx_t * wrk)
1212 u32 thread_index, *pending_acks;
1213 tcp_connection_t *tc;
1216 if (!vec_len (wrk->pending_acks))
1219 thread_index = wrk->vm->thread_index;
1220 pending_acks = wrk->pending_acks;
1221 for (i = 0; i < vec_len (pending_acks); i++)
1223 tc = tcp_connection_get (pending_acks[i], thread_index);
1224 tc->flags &= ~TCP_CONN_SNDACK;
1225 if (!tc->pending_dupacks)
1231 /* If we're supposed to send dupacks but have no ooo data
1232 * send only one ack */
1233 if (!vec_len (tc->snd_sacks))
1239 /* Start with first sack block */
1240 tc->snd_sack_pos = 0;
1242 /* Generate enough dupacks to cover all sack blocks. Do not generate
1243 * more sacks than the number of packets received. But do generate at
1244 * least 3, i.e., the number needed to signal congestion, if needed. */
1245 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1246 n_acks = clib_min (n_acks, tc->pending_dupacks);
1247 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1248 for (j = 0; j < n_acks; j++)
1251 tc->pending_dupacks = 0;
1252 tc->snd_sack_pos = 0;
1254 _vec_len (wrk->pending_acks) = 0;
1258 * Delayed ack timer handler
1260 * Sends delayed ACK when timer expires
1263 tcp_timer_delack_handler (u32 index)
1265 u32 thread_index = vlib_get_thread_index ();
1266 tcp_connection_t *tc;
1268 tc = tcp_connection_get (index, thread_index);
1269 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1274 * Allocate a new buffer and build a new tcp segment
1276 * @param wrk tcp worker
1277 * @param tc connection for which the segment will be allocated
1278 * @param offset offset of the first byte in the tx fifo
1279 * @param max_deq_byte segment size
1280 * @param[out] b pointer to buffer allocated
1282 * @return the number of bytes in the segment or 0 if buffer cannot be
1283 * allocated or no data available
1286 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1287 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1289 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1290 vlib_main_t *vm = wrk->vm;
1295 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1300 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1303 * Allocate and fill in buffer(s)
1306 /* Easy case, buffer size greater than mss */
1307 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1309 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1311 *b = vlib_get_buffer (vm, bi);
1312 data = tcp_init_buffer (vm, *b);
1313 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1315 ASSERT (n_bytes == max_deq_bytes);
1316 b[0]->current_length = n_bytes;
1317 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1318 /* burst */ 0, /* update_snd_nxt */ 0);
1320 /* Split mss into multiple buffers */
1323 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1324 u16 n_peeked, len_to_deq;
1325 vlib_buffer_t *chain_b, *prev_b;
1328 /* Make sure we have enough buffers */
1329 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1330 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1331 CLIB_CACHE_LINE_BYTES);
1332 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1333 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1336 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1340 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1341 data = tcp_init_buffer (vm, *b);
1342 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1344 TRANSPORT_MAX_HDRS_LEN);
1345 b[0]->current_length = n_bytes;
1346 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1347 b[0]->total_length_not_including_first_buffer = 0;
1348 max_deq_bytes -= n_bytes;
1351 for (i = 1; i < n_bufs_per_seg; i++)
1354 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1355 chain_bi = wrk->tx_buffers[--n_bufs];
1356 chain_b = vlib_get_buffer (vm, chain_bi);
1357 chain_b->current_data = 0;
1358 data = vlib_buffer_get_current (chain_b);
1359 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1362 ASSERT (n_peeked == len_to_deq);
1363 n_bytes += n_peeked;
1364 chain_b->current_length = n_peeked;
1365 chain_b->next_buffer = 0;
1367 /* update previous buffer */
1368 prev_b->next_buffer = chain_bi;
1369 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1371 max_deq_bytes -= n_peeked;
1372 b[0]->total_length_not_including_first_buffer += n_peeked;
1375 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1376 /* burst */ 0, /* update_snd_nxt */ 0);
1378 if (PREDICT_FALSE (n_bufs))
1380 clib_warning ("not all buffers consumed");
1381 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1385 ASSERT (n_bytes > 0);
1386 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1392 * Build a retransmit segment
1394 * @return the number of bytes in the segment or 0 if there's nothing to
1398 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1399 tcp_connection_t * tc, u32 offset,
1400 u32 max_deq_bytes, vlib_buffer_t ** b)
1402 u32 start, available_bytes;
1405 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1406 ASSERT (max_deq_bytes != 0);
1409 * Make sure we can retransmit something
1411 available_bytes = transport_max_tx_dequeue (&tc->connection);
1412 ASSERT (available_bytes >= offset);
1413 available_bytes -= offset;
1414 if (!available_bytes)
1417 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1418 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1420 /* Start is beyond snd_congestion */
1421 start = tc->snd_una + offset;
1422 if (seq_geq (start, tc->snd_congestion))
1425 /* Don't overshoot snd_congestion */
1426 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1428 max_deq_bytes = tc->snd_congestion - start;
1429 if (max_deq_bytes == 0)
1433 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1437 if (tcp_in_fastrecovery (tc))
1438 tc->snd_rxt_bytes += n_bytes;
1441 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1446 * Reset congestion control, switch cwnd to loss window and try again.
1449 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1451 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1452 tc->prev_ssthresh = tc->ssthresh;
1453 tc->prev_cwnd = tc->cwnd;
1455 /* Cleanly recover cc (also clears up fast retransmit) */
1456 if (tcp_in_fastrecovery (tc))
1458 /* TODO be less aggressive about this */
1459 scoreboard_clear (&tc->sack_sb);
1460 tcp_cc_fastrecovery_exit (tc);
1463 tc->rcv_dupacks = 0;
1465 /* Start again from the beginning */
1466 tc->cc_algo->congestion (tc);
1467 tc->cwnd = tcp_loss_wnd (tc);
1468 tc->snd_congestion = tc->snd_nxt;
1470 tc->cwnd_acc_bytes = 0;
1471 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1472 tcp_recovery_on (tc);
1476 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1478 u32 thread_index = vlib_get_thread_index ();
1479 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1480 vlib_main_t *vm = wrk->vm;
1481 tcp_connection_t *tc;
1482 vlib_buffer_t *b = 0;
1487 tc = tcp_half_open_connection_get (index);
1488 /* Note: the connection may have transitioned to ESTABLISHED... */
1489 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1491 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1495 tc = tcp_connection_get (index, thread_index);
1496 /* Note: the connection may have been closed and pool_put */
1497 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1499 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1500 /* Wait-close and retransmit could pop at the same time */
1501 if (tc->state == TCP_STATE_CLOSED)
1505 if (tc->state >= TCP_STATE_ESTABLISHED)
1507 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1509 /* Lost FIN, retransmit and return */
1510 if (tc->flags & TCP_CONN_FINSNT)
1514 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1518 /* Shouldn't be here. This condition is tricky because it has to take
1519 * into account boff > 0 due to persist timeout. */
1520 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1521 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1522 && !tcp_flight_size (tc)))
1524 ASSERT (!tcp_in_recovery (tc));
1529 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1530 * to persist timer timeout */
1531 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1534 tcp_update_rto (tc);
1537 /* Increment RTO backoff (also equal to number of retries) and go back
1538 * to first un-acked byte */
1541 /* First retransmit timeout */
1542 if (tc->rto_boff == 1)
1543 tcp_rxt_timeout_cc (tc);
1545 scoreboard_clear (&tc->sack_sb);
1547 /* If we've sent beyond snd_congestion, update it */
1548 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1550 tc->snd_nxt = tc->snd_una;
1551 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1553 /* Send one segment. Note that n_bytes may be zero due to buffer
1555 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1558 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1562 bi = vlib_get_buffer_index (vm, b);
1564 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1565 if (tc->rto_boff == 1)
1566 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1568 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1569 tcp_retransmit_timer_force_update (tc);
1571 /* Retransmit for SYN */
1572 else if (tc->state == TCP_STATE_SYN_SENT)
1574 /* Half-open connection actually moved to established but we were
1575 * waiting for syn retransmit to pop to call cleanup from the right
1577 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1579 if (tcp_half_open_connection_cleanup (tc))
1580 TCP_DBG ("could not remove half-open connection");
1584 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1586 /* Try without increasing RTO a number of times. If this fails,
1587 * start growing RTO exponentially */
1589 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1590 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1592 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1593 tc->rto * TCP_TO_TIMER_TICK);
1595 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1597 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1601 b = vlib_get_buffer (vm, bi);
1602 tcp_init_buffer (vm, b);
1603 tcp_make_syn (tc, b);
1606 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1608 /* This goes straight to ipx_lookup. Retransmit timer set already */
1609 tcp_push_ip_hdr (wrk, tc, b);
1610 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1612 /* Retransmit SYN-ACK */
1613 else if (tc->state == TCP_STATE_SYN_RCVD)
1615 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1618 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1619 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1622 tcp_retransmit_timer_force_update (tc);
1624 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1626 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1630 b = vlib_get_buffer (vm, bi);
1631 tcp_init_buffer (vm, b);
1632 tcp_make_synack (tc, b);
1633 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1635 /* Retransmit timer already updated, just enqueue to output */
1636 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1640 ASSERT (tc->state == TCP_STATE_CLOSED);
1646 tcp_timer_retransmit_handler (u32 index)
1648 tcp_timer_retransmit_handler_i (index, 0);
1652 tcp_timer_retransmit_syn_handler (u32 index)
1654 tcp_timer_retransmit_handler_i (index, 1);
1658 * Got 0 snd_wnd from peer, try to do something about it.
1662 tcp_timer_persist_handler (u32 index)
1664 u32 thread_index = vlib_get_thread_index ();
1665 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1666 u32 bi, max_snd_bytes, available_bytes, offset;
1667 tcp_main_t *tm = vnet_get_tcp_main ();
1668 vlib_main_t *vm = wrk->vm;
1669 tcp_connection_t *tc;
1674 tc = tcp_connection_get_if_valid (index, thread_index);
1678 /* Make sure timer handle is set to invalid */
1679 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1681 /* Problem already solved or worse */
1682 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1683 || (tc->flags & TCP_CONN_FINSNT))
1686 available_bytes = transport_max_tx_dequeue (&tc->connection);
1687 offset = tc->snd_nxt - tc->snd_una;
1689 /* Reprogram persist if no new bytes available to send. We may have data
1691 if (!available_bytes)
1693 tcp_persist_timer_set (tc);
1697 if (available_bytes <= offset)
1699 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1703 /* Increment RTO backoff */
1705 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1708 * Try to force the first unsent segment (or buffer)
1710 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1712 tcp_persist_timer_set (tc);
1715 b = vlib_get_buffer (vm, bi);
1716 data = tcp_init_buffer (vm, b);
1718 tcp_validate_txf_size (tc, offset);
1719 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1720 max_snd_bytes = clib_min (tc->snd_mss,
1721 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1722 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1724 b->current_length = n_bytes;
1725 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1726 || tc->snd_nxt == tc->snd_una_max
1727 || tc->rto_boff > 1));
1729 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1730 /* burst */ 0, /* update_snd_nxt */ 1);
1731 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1732 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1733 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1735 /* Just sent new data, enable retransmit */
1736 tcp_retransmit_timer_update (tc);
1740 * Retransmit first unacked segment
1743 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1745 vlib_main_t *vm = wrk->vm;
1749 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1751 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1755 bi = vlib_get_buffer_index (vm, b);
1756 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1762 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1765 u32 offset, n_segs = 0, n_written, bi;
1766 vlib_main_t *vm = wrk->vm;
1767 vlib_buffer_t *b = 0;
1769 offset = tc->snd_nxt - tc->snd_una;
1770 while (n_segs < burst_size)
1772 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1776 bi = vlib_get_buffer_index (vm, b);
1777 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1778 offset += n_written;
1781 tc->snd_nxt += n_written;
1782 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1789 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1790 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1791 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1794 * Do fast retransmit with SACKs
1797 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1800 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1801 sack_scoreboard_hole_t *hole;
1802 vlib_main_t *vm = wrk->vm;
1803 vlib_buffer_t *b = 0;
1804 sack_scoreboard_t *sb;
1807 u8 snd_limited = 0, can_rescue = 0;
1809 ASSERT (tcp_in_fastrecovery (tc));
1811 snd_space = tcp_available_cc_snd_space (tc);
1812 if (snd_space < tc->snd_mss)
1814 tcp_program_fastretransmit (wrk, tc);
1818 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1820 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1822 max_deq = transport_max_tx_dequeue (&tc->connection);
1823 max_deq -= tc->snd_nxt - tc->snd_una;
1825 while (snd_space > 0 && n_segs < burst_size)
1827 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1833 snd_space = clib_min (max_deq, snd_space);
1834 burst_size = clib_min (burst_size - n_segs,
1835 snd_space / tc->snd_mss);
1836 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1837 if (max_deq > n_segs_now * tc->snd_mss)
1838 tcp_program_fastretransmit (wrk, tc);
1839 n_segs += n_segs_now;
1843 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1846 /* If rescue rxt undefined or less than snd_una then one segment of
1847 * up to SMSS octets that MUST include the highest outstanding
1848 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1849 * RecoveryPoint. HighRxt MUST NOT be updated.
1851 max_bytes = clib_min (tc->snd_mss,
1852 tc->snd_congestion - tc->snd_una);
1853 max_bytes = clib_min (max_bytes, snd_space);
1854 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1855 sb->rescue_rxt = tc->snd_congestion;
1856 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1861 bi = vlib_get_buffer_index (vm, b);
1862 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1867 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1868 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1872 offset = sb->high_rxt - tc->snd_una;
1873 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1875 ASSERT (n_written <= snd_space);
1877 /* Nothing left to retransmit */
1881 bi = vlib_get_buffer_index (vm, b);
1882 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1884 sb->high_rxt += n_written;
1885 snd_space -= n_written;
1890 tcp_program_fastretransmit (wrk, tc);
1897 * Fast retransmit without SACK info
1900 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1903 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1904 vlib_main_t *vm = wrk->vm;
1905 int snd_space, n_segs = 0;
1908 ASSERT (tcp_in_fastrecovery (tc));
1909 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1911 if (!tcp_fastrecovery_first (tc))
1914 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1916 snd_space = tc->sack_sb.last_bytes_delivered;
1917 while (snd_space > 0 && n_segs < burst_size)
1919 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1922 /* Nothing left to retransmit */
1926 bi = vlib_get_buffer_index (vm, b);
1927 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1928 snd_space -= n_written;
1929 offset += n_written;
1933 if (n_segs == burst_size)
1938 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1939 snd_space = tcp_available_cc_snd_space (tc);
1940 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1943 max_deq = transport_max_tx_dequeue (&tc->connection);
1944 max_deq -= tc->snd_nxt - tc->snd_una;
1947 snd_space = clib_min (max_deq, snd_space);
1948 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1949 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1950 if (max_deq > n_segs_now * tc->snd_mss)
1951 tcp_program_fastretransmit (wrk, tc);
1952 n_segs += n_segs_now;
1956 tcp_fastrecovery_first_off (tc);
1961 * Do fast retransmit
1964 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1967 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1968 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1970 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1972 #endif /* CLIB_MARCH_VARIANT */
1975 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1976 u16 * next0, u32 * error0)
1978 ip_adjacency_t *adj;
1981 /* Not thread safe but as long as the connection exists the adj should
1983 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1985 if (ai == ADJ_INDEX_INVALID)
1987 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1988 *next0 = TCP_OUTPUT_NEXT_DROP;
1989 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1994 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1995 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1996 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1997 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2000 *next0 = TCP_OUTPUT_NEXT_DROP;
2001 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2003 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2007 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2008 u32 * to_next, u32 n_bufs)
2010 u32 n_trace = vlib_get_trace_count (vm, node);
2011 tcp_connection_t *tc;
2017 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2019 b = vlib_get_buffer (vm, to_next[i]);
2020 th = vlib_buffer_get_current (b);
2021 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2023 t = vlib_add_trace (vm, node, b, sizeof (*t));
2024 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2025 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2030 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2031 tcp_connection_t * tc0, u8 is_ip4)
2033 tcp_header_t *th0 = 0;
2035 th0 = vlib_buffer_get_current (b0);
2036 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2039 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2040 IP_PROTOCOL_TCP, 1);
2041 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2042 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2048 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2049 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2050 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2051 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2052 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2058 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2059 u32 * error0, u16 * next0, u8 is_ip4)
2062 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2064 *error0 = TCP_ERROR_INVALID_CONNECTION;
2065 *next0 = TCP_OUTPUT_NEXT_DROP;
2069 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2070 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2074 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2075 tcp_output_handle_link_local (tc0, b0, next0, error0);
2078 if (!TCP_ALWAYS_ACK)
2079 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2083 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2084 vlib_frame_t * frame, int is_ip4)
2086 u32 n_left_from, *from, thread_index = vm->thread_index;
2087 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2088 u16 nexts[VLIB_FRAME_SIZE], *next;
2090 from = vlib_frame_vector_args (frame);
2091 n_left_from = frame->n_vectors;
2092 tcp_set_time_now (tcp_get_worker (thread_index));
2094 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2095 tcp46_output_trace_frame (vm, node, from, n_left_from);
2097 vlib_get_buffers (vm, from, bufs, n_left_from);
2101 while (n_left_from >= 4)
2103 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2104 tcp_connection_t *tc0, *tc1;
2107 vlib_prefetch_buffer_header (b[2], STORE);
2108 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2110 vlib_prefetch_buffer_header (b[3], STORE);
2111 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2114 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2116 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2118 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2121 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2122 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2124 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2125 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2131 while (n_left_from > 0)
2133 u32 error0 = TCP_ERROR_PKTS_SENT;
2134 tcp_connection_t *tc0;
2136 if (n_left_from > 1)
2138 vlib_prefetch_buffer_header (b[1], STORE);
2139 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2142 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2143 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2146 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2147 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2154 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2155 return frame->n_vectors;
2158 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2159 vlib_frame_t * from_frame)
2161 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2164 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2165 vlib_frame_t * from_frame)
2167 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2171 VLIB_REGISTER_NODE (tcp4_output_node) =
2173 .name = "tcp4-output",
2174 /* Takes a vector of packets. */
2175 .vector_size = sizeof (u32),
2176 .n_errors = TCP_N_ERROR,
2177 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2178 .error_strings = tcp_error_strings,
2179 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2181 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2182 foreach_tcp4_output_next
2185 .format_buffer = format_tcp_header,
2186 .format_trace = format_tcp_tx_trace,
2191 VLIB_REGISTER_NODE (tcp6_output_node) =
2193 .name = "tcp6-output",
2194 /* Takes a vector of packets. */
2195 .vector_size = sizeof (u32),
2196 .n_errors = TCP_N_ERROR,
2197 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2198 .error_strings = tcp_error_strings,
2199 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2201 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2202 foreach_tcp6_output_next
2205 .format_buffer = format_tcp_header,
2206 .format_trace = format_tcp_tx_trace,
2210 typedef enum _tcp_reset_next
2212 TCP_RESET_NEXT_DROP,
2213 TCP_RESET_NEXT_IP_LOOKUP,
2217 #define foreach_tcp4_reset_next \
2218 _(DROP, "error-drop") \
2219 _(IP_LOOKUP, "ip4-lookup")
2221 #define foreach_tcp6_reset_next \
2222 _(DROP, "error-drop") \
2223 _(IP_LOOKUP, "ip6-lookup")
2226 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2227 vlib_frame_t * from_frame, u8 is_ip4)
2229 u32 n_left_from, next_index, *from, *to_next;
2230 u32 my_thread_index = vm->thread_index;
2232 from = vlib_frame_vector_args (from_frame);
2233 n_left_from = from_frame->n_vectors;
2235 next_index = node->cached_next_index;
2237 while (n_left_from > 0)
2241 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2243 while (n_left_from > 0 && n_left_to_next > 0)
2249 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2256 n_left_to_next -= 1;
2258 b0 = vlib_get_buffer (vm, bi0);
2260 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2261 my_thread_index, is_ip4))
2263 error0 = TCP_ERROR_LOOKUP_DROPS;
2264 next0 = TCP_RESET_NEXT_DROP;
2268 /* Prepare to send to IP lookup */
2269 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2270 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2273 b0->error = node->errors[error0];
2274 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2275 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2277 th0 = vlib_buffer_get_current (b0);
2279 th0 = ip4_next_header ((ip4_header_t *) th0);
2281 th0 = ip6_next_header ((ip6_header_t *) th0);
2282 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2283 clib_memcpy_fast (&t0->tcp_header, th0,
2284 sizeof (t0->tcp_header));
2287 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2288 n_left_to_next, bi0, next0);
2290 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2292 return from_frame->n_vectors;
2295 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2296 vlib_frame_t * from_frame)
2298 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2301 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2302 vlib_frame_t * from_frame)
2304 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2308 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2309 .name = "tcp4-reset",
2310 .vector_size = sizeof (u32),
2311 .n_errors = TCP_N_ERROR,
2312 .error_strings = tcp_error_strings,
2313 .n_next_nodes = TCP_RESET_N_NEXT,
2315 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2316 foreach_tcp4_reset_next
2319 .format_trace = format_tcp_tx_trace,
2324 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2325 .name = "tcp6-reset",
2326 .vector_size = sizeof (u32),
2327 .n_errors = TCP_N_ERROR,
2328 .error_strings = tcp_error_strings,
2329 .n_next_nodes = TCP_RESET_N_NEXT,
2331 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2332 foreach_tcp6_reset_next
2335 .format_trace = format_tcp_tx_trace,
2340 * fd.io coding-style-patch-verification: ON
2343 * eval: (c-set-style "gnu")