2 * Copyright (c) 2016 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>
17 #include <vnet/lisp-cp/packets.h>
20 vlib_node_registration_t tcp4_output_node;
21 vlib_node_registration_t tcp6_output_node;
23 typedef enum _tcp_output_next
26 TCP_OUTPUT_NEXT_IP_LOOKUP,
27 TCP_OUTPUT_NEXT_IP_REWRITE,
28 TCP_OUTPUT_NEXT_IP_ARP,
32 #define foreach_tcp4_output_next \
33 _ (DROP, "error-drop") \
34 _ (IP_LOOKUP, "ip4-lookup") \
35 _ (IP_REWRITE, "ip4-rewrite") \
38 #define foreach_tcp6_output_next \
39 _ (DROP, "error-drop") \
40 _ (IP_LOOKUP, "ip6-lookup") \
41 _ (IP_REWRITE, "ip6-rewrite") \
42 _ (IP_ARP, "ip6-discover-neighbor")
44 static char *tcp_error_strings[] = {
45 #define tcp_error(n,s) s,
46 #include <vnet/tcp/tcp_error.def>
52 tcp_header_t tcp_header;
53 tcp_connection_t tcp_connection;
59 format_tcp_tx_trace (u8 * s, va_list * args)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
63 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
64 u32 indent = format_get_indent (s);
66 s = format (s, "%U\n%U%U",
67 format_tcp_header, &t->tcp_header, 128,
68 format_white_space, indent,
69 format_tcp_connection, &t->tcp_connection, 1);
75 tcp_window_compute_scale (u32 window)
78 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
84 * Update max segment size we're able to process.
86 * The value is constrained by our interface's MTU and IP options. It is
87 * also what we advertise to our peer.
90 tcp_update_rcv_mss (tcp_connection_t * tc)
92 /* TODO find our iface MTU */
93 tc->mss = dummy_mtu - sizeof (tcp_header_t);
97 * TCP's initial window
100 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
102 /* RFC 6928 recommends the value lower. However at the time our connections
103 * are initialized, fifos may not be allocated. Therefore, advertise the
104 * smallest possible unscaled window size and update once fifos are
105 * assigned to the session.
108 tcp_update_rcv_mss (tc);
109 TCP_IW_N_SEGMENTS * tc->mss;
111 return TCP_MIN_RX_FIFO_SIZE;
115 * Compute initial window and scale factor. As per RFC1323, window field in
116 * SYN and SYN-ACK segments is never scaled.
119 tcp_initial_window_to_advertise (tcp_connection_t * tc)
123 /* Initial wnd for SYN. Fifos are not allocated yet.
124 * Use some predefined value. For SYN-ACK we still want the
125 * scale to be computed in the same way */
126 max_fifo = TCP_MAX_RX_FIFO_SIZE;
128 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
129 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
131 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
135 tcp_update_rcv_wnd (tcp_connection_t * tc)
138 u32 available_space, max_fifo, wnd;
141 * Figure out how much space we have available
143 available_space = transport_max_rx_enqueue (&tc->connection);
144 max_fifo = transport_rx_fifo_size (&tc->connection);
146 ASSERT (tc->rcv_opts.mss < max_fifo);
147 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
151 * Use the above and what we know about what we've previously advertised
152 * to compute the new window
154 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
155 if (observed_wnd < 0)
158 /* Bad. Thou shalt not shrink */
159 if (available_space < observed_wnd)
162 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
166 wnd = available_space;
169 /* Make sure we have a multiple of rcv_wscale */
170 if (wnd && tc->rcv_wscale)
172 wnd &= ~(1 << tc->rcv_wscale);
174 wnd = 1 << tc->rcv_wscale;
177 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
181 * Compute and return window to advertise, scaled as per RFC1323
184 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
186 if (state < TCP_STATE_ESTABLISHED)
187 return tcp_initial_window_to_advertise (tc);
189 tcp_update_rcv_wnd (tc);
191 if (tc->rcv_wnd == 0)
193 tc->flags |= TCP_CONN_SENT_RCV_WND0;
197 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
200 return tc->rcv_wnd >> tc->rcv_wscale;
204 * Write TCP options to segment.
207 tcp_options_write (u8 * data, tcp_options_t * opts)
210 u32 buf, seq_len = 4;
212 if (tcp_opts_mss (opts))
214 *data++ = TCP_OPTION_MSS;
215 *data++ = TCP_OPTION_LEN_MSS;
216 buf = clib_host_to_net_u16 (opts->mss);
217 clib_memcpy (data, &buf, sizeof (opts->mss));
218 data += sizeof (opts->mss);
219 opts_len += TCP_OPTION_LEN_MSS;
222 if (tcp_opts_wscale (opts))
224 *data++ = TCP_OPTION_WINDOW_SCALE;
225 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
226 *data++ = opts->wscale;
227 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
230 if (tcp_opts_sack_permitted (opts))
232 *data++ = TCP_OPTION_SACK_PERMITTED;
233 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
234 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
237 if (tcp_opts_tstamp (opts))
239 *data++ = TCP_OPTION_TIMESTAMP;
240 *data++ = TCP_OPTION_LEN_TIMESTAMP;
241 buf = clib_host_to_net_u32 (opts->tsval);
242 clib_memcpy (data, &buf, sizeof (opts->tsval));
243 data += sizeof (opts->tsval);
244 buf = clib_host_to_net_u32 (opts->tsecr);
245 clib_memcpy (data, &buf, sizeof (opts->tsecr));
246 data += sizeof (opts->tsecr);
247 opts_len += TCP_OPTION_LEN_TIMESTAMP;
250 if (tcp_opts_sack (opts))
253 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
254 TCP_OPTS_MAX_SACK_BLOCKS);
256 if (n_sack_blocks != 0)
258 *data++ = TCP_OPTION_SACK_BLOCK;
259 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
260 for (i = 0; i < n_sack_blocks; i++)
262 buf = clib_host_to_net_u32 (opts->sacks[i].start);
263 clib_memcpy (data, &buf, seq_len);
265 buf = clib_host_to_net_u32 (opts->sacks[i].end);
266 clib_memcpy (data, &buf, seq_len);
269 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
273 /* Terminate TCP options */
276 *data++ = TCP_OPTION_EOL;
277 opts_len += TCP_OPTION_LEN_EOL;
280 /* Pad with zeroes to a u32 boundary */
283 *data++ = TCP_OPTION_NOOP;
284 opts_len += TCP_OPTION_LEN_NOOP;
290 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
294 opts->flags |= TCP_OPTS_FLAG_MSS;
295 opts->mss = dummy_mtu; /*XXX discover that */
296 len += TCP_OPTION_LEN_MSS;
298 opts->flags |= TCP_OPTS_FLAG_WSCALE;
299 opts->wscale = wnd_scale;
300 len += TCP_OPTION_LEN_WINDOW_SCALE;
302 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
303 opts->tsval = tcp_time_now ();
305 len += TCP_OPTION_LEN_TIMESTAMP;
309 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
310 len += TCP_OPTION_LEN_SACK_PERMITTED;
313 /* Align to needed boundary */
314 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
319 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
323 opts->flags |= TCP_OPTS_FLAG_MSS;
325 len += TCP_OPTION_LEN_MSS;
327 if (tcp_opts_wscale (&tc->rcv_opts))
329 opts->flags |= TCP_OPTS_FLAG_WSCALE;
330 opts->wscale = tc->rcv_wscale;
331 len += TCP_OPTION_LEN_WINDOW_SCALE;
334 if (tcp_opts_tstamp (&tc->rcv_opts))
336 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
337 opts->tsval = tcp_time_now ();
338 opts->tsecr = tc->tsval_recent;
339 len += TCP_OPTION_LEN_TIMESTAMP;
342 if (tcp_opts_sack_permitted (&tc->rcv_opts))
344 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
345 len += TCP_OPTION_LEN_SACK_PERMITTED;
348 /* Align to needed boundary */
349 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
354 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
360 if (tcp_opts_tstamp (&tc->rcv_opts))
362 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
363 opts->tsval = tcp_time_now ();
364 opts->tsecr = tc->tsval_recent;
365 len += TCP_OPTION_LEN_TIMESTAMP;
367 if (tcp_opts_sack_permitted (&tc->rcv_opts))
369 if (vec_len (tc->snd_sacks))
371 opts->flags |= TCP_OPTS_FLAG_SACK;
372 opts->sacks = tc->snd_sacks;
373 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
374 TCP_OPTS_MAX_SACK_BLOCKS);
375 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
379 /* Align to needed boundary */
380 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
385 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
390 case TCP_STATE_ESTABLISHED:
391 case TCP_STATE_FIN_WAIT_1:
392 case TCP_STATE_CLOSED:
393 case TCP_STATE_CLOSE_WAIT:
394 return tcp_make_established_options (tc, opts);
395 case TCP_STATE_SYN_RCVD:
396 return tcp_make_synack_options (tc, opts);
397 case TCP_STATE_SYN_SENT:
398 return tcp_make_syn_options (opts, tc->rcv_wscale);
400 clib_warning ("State not handled! %d", state);
406 * Update burst send vars
408 * - Updates snd_mss to reflect the effective segment size that we can send
409 * by taking into account all TCP options, including SACKs.
410 * - Cache 'on the wire' options for reuse
411 * - Updates receive window which can be reused for a burst.
413 * This should *only* be called when doing bursts
416 tcp_update_burst_snd_vars (tcp_connection_t * tc)
418 tcp_main_t *tm = &tcp_main;
420 /* Compute options to be used for connection. These may be reused when
421 * sending data or to compute the effective mss (snd_mss) */
422 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
423 TCP_STATE_ESTABLISHED);
425 /* XXX check if MTU has been updated */
426 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
427 ASSERT (tc->snd_mss > 0);
429 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
432 tcp_update_rcv_wnd (tc);
436 tcp_init_mss (tcp_connection_t * tc)
438 u16 default_min_mss = 536;
439 tcp_update_rcv_mss (tc);
441 /* TODO cache mss and consider PMTU discovery */
442 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
444 if (tc->snd_mss < 45)
446 clib_warning ("snd mss is 0");
447 /* Assume that at least the min default mss works */
448 tc->snd_mss = default_min_mss;
449 tc->rcv_opts.mss = default_min_mss;
452 /* We should have enough space for 40 bytes of options */
453 ASSERT (tc->snd_mss > 45);
455 /* If we use timestamp option, account for it */
456 if (tcp_opts_tstamp (&tc->rcv_opts))
457 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
461 tcp_alloc_tx_buffers (tcp_main_t * tm, u8 thread_index, u16 * n_bufs,
464 tcp_worker_ctx_t *ctx = &tm->wrk_ctx[thread_index];
465 vlib_main_t *vm = vlib_get_main ();
468 ASSERT (wanted > *n_bufs);
469 vec_validate_aligned (ctx->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
470 n_alloc = vlib_buffer_alloc (vm, &ctx->tx_buffers[*n_bufs],
473 _vec_len (ctx->tx_buffers) = *n_bufs;
478 tcp_get_free_buffer_index (tcp_main_t * tm, u32 * bidx)
480 u32 thread_index = vlib_get_thread_index ();
481 tcp_worker_ctx_t *ctx = &tm->wrk_ctx[thread_index];
482 u16 n_bufs = vec_len (ctx->tx_buffers);
484 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (thread_index);
486 if (PREDICT_FALSE (!n_bufs))
488 if (!tcp_alloc_tx_buffers (tm, thread_index, &n_bufs, VLIB_FRAME_SIZE))
494 *bidx = ctx->tx_buffers[--n_bufs];
495 _vec_len (ctx->tx_buffers) = n_bufs;
500 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
502 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
503 vlib_buffer_free_one (vm, b->next_buffer);
504 /* Zero all flags but free list index and trace flag */
505 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
507 b->current_length = 0;
508 b->total_length_not_including_first_buffer = 0;
509 vnet_buffer (b)->tcp.flags = 0;
511 /* Leave enough space for headers */
512 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
516 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
518 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
519 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
520 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
521 b->total_length_not_including_first_buffer = 0;
523 vnet_buffer (b)->tcp.flags = 0;
524 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
525 /* Leave enough space for headers */
526 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
533 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
536 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
537 u8 tcp_opts_len, tcp_hdr_opts_len;
541 wnd = tcp_window_to_advertise (tc, state);
543 /* Make and write options */
544 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
545 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
547 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
548 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
550 tcp_options_write ((u8 *) (th + 1), snd_opts);
551 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
555 * Convert buffer to ACK
558 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
560 vlib_main_t *vm = vlib_get_main ();
562 tcp_reuse_buffer (vm, b);
563 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
564 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
565 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
566 tc->rcv_las = tc->rcv_nxt;
570 * Convert buffer to FIN-ACK
573 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
575 vlib_main_t *vm = vlib_get_main ();
578 tcp_reuse_buffer (vm, b);
580 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
581 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
583 /* Reset flags, make sure ack is sent */
584 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
588 * Convert buffer to SYN
591 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
593 u8 tcp_hdr_opts_len, tcp_opts_len;
596 tcp_options_t snd_opts;
598 initial_wnd = tcp_initial_window_to_advertise (tc);
600 /* Make and write options */
601 memset (&snd_opts, 0, sizeof (snd_opts));
602 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
603 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
605 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
606 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
608 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
609 tcp_options_write ((u8 *) (th + 1), &snd_opts);
613 * Convert buffer to SYN-ACK
616 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
618 vlib_main_t *vm = vlib_get_main ();
619 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
620 u8 tcp_opts_len, tcp_hdr_opts_len;
624 memset (snd_opts, 0, sizeof (*snd_opts));
625 tcp_reuse_buffer (vm, b);
627 initial_wnd = tcp_initial_window_to_advertise (tc);
628 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
629 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
631 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
632 tc->rcv_nxt, tcp_hdr_opts_len,
633 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
634 tcp_options_write ((u8 *) (th + 1), snd_opts);
636 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
637 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
639 /* Init retransmit timer. Use update instead of set because of
641 tcp_retransmit_timer_force_update (tc);
642 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
646 tcp_enqueue_to_ip_lookup_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
647 u8 is_ip4, u32 fib_index, u8 flush)
649 tcp_main_t *tm = vnet_get_tcp_main ();
650 u32 thread_index = vlib_get_thread_index ();
651 u32 *to_next, next_index;
654 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
657 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
658 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
660 /* Send to IP lookup */
661 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
662 tcp_trajectory_add_start (b, 1);
664 f = tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4];
667 f = vlib_get_frame_to_node (vm, next_index);
669 tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = f;
672 to_next = vlib_frame_vector_args (f);
673 to_next[f->n_vectors] = bi;
675 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
677 vlib_put_frame_to_node (vm, next_index, f);
678 tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = 0;
683 tcp_enqueue_to_ip_lookup_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
684 u8 is_ip4, u32 fib_index)
686 tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, fib_index, 1);
690 tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
691 u8 is_ip4, u32 fib_index)
693 tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, fib_index, 0);
694 if (vm->thread_index == 0 && vlib_num_workers ())
695 session_flush_frames_main_thread (vm);
699 tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
702 tcp_main_t *tm = vnet_get_tcp_main ();
703 u32 thread_index = vlib_get_thread_index ();
704 u32 *to_next, next_index;
707 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
710 /* Decide where to send the packet */
711 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
712 tcp_trajectory_add_start (b, 2);
714 /* Get frame to v4/6 output node */
715 f = tm->wrk_ctx[thread_index].tx_frames[!is_ip4];
718 f = vlib_get_frame_to_node (vm, next_index);
720 tm->wrk_ctx[thread_index].tx_frames[!is_ip4] = f;
722 to_next = vlib_frame_vector_args (f);
723 to_next[f->n_vectors] = bi;
725 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
727 vlib_put_frame_to_node (vm, next_index, f);
728 tm->wrk_ctx[thread_index].tx_frames[!is_ip4] = 0;
733 tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
735 tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
739 tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
742 tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
746 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
747 tcp_state_t state, u8 thread_index, u8 is_ip4)
752 ip4_address_t src_ip40, dst_ip40;
753 ip6_address_t src_ip60, dst_ip60;
754 u16 src_port, dst_port;
759 /* Find IP and TCP headers */
760 th0 = tcp_buffer_hdr (b0);
762 /* Save src and dst ip */
765 ih4 = vlib_buffer_get_current (b0);
766 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
767 src_ip40.as_u32 = ih4->src_address.as_u32;
768 dst_ip40.as_u32 = ih4->dst_address.as_u32;
772 ih6 = vlib_buffer_get_current (b0);
773 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
774 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
775 clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
778 src_port = th0->src_port;
779 dst_port = th0->dst_port;
781 /* Try to determine what/why we're actually resetting */
782 if (state == TCP_STATE_CLOSED)
787 tmp = clib_net_to_host_u32 (th0->seq_number);
789 /* Got a SYN for no listener. */
790 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
791 ack = clib_host_to_net_u32 (tmp + 1);
796 flags = TCP_FLAG_RST;
797 seq = th0->ack_number;
801 tcp_reuse_buffer (vm, b0);
802 tcp_trajectory_add_start (b0, 4);
803 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
804 sizeof (tcp_header_t), flags, 0);
808 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
810 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
815 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
817 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
825 * Send reset without reusing existing buffer
827 * It extracts connection info out of original packet
830 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
833 u32 bi, sw_if_index, fib_index;
834 tcp_main_t *tm = vnet_get_tcp_main ();
835 vlib_main_t *vm = vlib_get_main ();
836 u8 tcp_hdr_len, flags = 0;
837 tcp_header_t *th, *pkt_th;
839 ip4_header_t *ih4, *pkt_ih4;
840 ip6_header_t *ih6, *pkt_ih6;
841 fib_protocol_t fib_proto;
843 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
846 b = vlib_get_buffer (vm, bi);
847 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
848 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
849 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
850 tcp_init_buffer (vm, b);
852 /* Make and write options */
853 tcp_hdr_len = sizeof (tcp_header_t);
857 pkt_ih4 = vlib_buffer_get_current (pkt);
858 pkt_th = ip4_next_header (pkt_ih4);
862 pkt_ih6 = vlib_buffer_get_current (pkt);
863 pkt_th = ip6_next_header (pkt_ih6);
866 if (tcp_ack (pkt_th))
868 flags = TCP_FLAG_RST;
869 seq = pkt_th->ack_number;
870 ack = (tc && tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
874 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
876 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
879 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
880 seq, ack, tcp_hdr_len, flags, 0);
882 /* Swap src and dst ip */
885 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
886 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
887 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
888 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
893 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
895 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
896 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
897 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
901 tcp_enqueue_to_ip_lookup_now (vm, b, bi, is_ip4, fib_index);
902 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
906 * Build and set reset packet for connection
909 tcp_send_reset (tcp_connection_t * tc)
911 vlib_main_t *vm = vlib_get_main ();
912 tcp_main_t *tm = vnet_get_tcp_main ();
916 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
919 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
921 b = vlib_get_buffer (vm, bi);
922 tcp_init_buffer (vm, b);
924 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
925 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
926 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
927 flags = TCP_FLAG_RST;
928 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
929 tc->rcv_nxt, tcp_hdr_opts_len, flags,
931 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
932 ASSERT (opts_write_len == tc->snd_opts_len);
933 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
937 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
938 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
939 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
945 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
946 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
947 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
950 tcp_enqueue_to_ip_lookup_now (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
951 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
955 tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
957 tcp_header_t *th = vlib_buffer_get_current (b);
958 vlib_main_t *vm = vlib_get_main ();
962 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
963 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
964 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
971 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
972 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
973 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
981 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
982 * The packet is not forwarded through tcpx_output to avoid doing lookups
983 * in the half_open pool.
986 tcp_send_syn (tcp_connection_t * tc)
990 tcp_main_t *tm = vnet_get_tcp_main ();
991 vlib_main_t *vm = vlib_get_main ();
994 * Setup retransmit and establish timers before requesting buffer
995 * such that we can return if we've ran out.
997 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
998 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
999 tc->rto * TCP_TO_TIMER_TICK);
1001 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1004 b = vlib_get_buffer (vm, bi);
1005 tcp_init_buffer (vm, b);
1006 tcp_make_syn (tc, b);
1008 /* Measure RTT with this */
1009 tc->rtt_ts = tcp_time_now ();
1010 tc->rtt_seq = tc->snd_nxt;
1013 tcp_push_ip_hdr (tm, tc, b);
1014 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
1015 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1019 * Flush tx frame populated by retransmits and timer pops
1022 tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
1024 if (tcp_main.wrk_ctx[thread_index].tx_frames[!is_ip4])
1027 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1028 vlib_put_frame_to_node (vm, next_index,
1030 wrk_ctx[thread_index].tx_frames[!is_ip4]);
1031 tcp_main.wrk_ctx[thread_index].tx_frames[!is_ip4] = 0;
1036 * Flush ip lookup tx frames populated by timer pops
1039 tcp_flush_frame_to_ip_lookup (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
1041 if (tcp_main.wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4])
1044 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1045 vlib_put_frame_to_node (vm, next_index,
1047 wrk_ctx[thread_index].ip_lookup_tx_frames
1049 tcp_main.wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = 0;
1054 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1057 tcp_flush_frames_to_output (u8 thread_index)
1059 vlib_main_t *vm = vlib_get_main ();
1060 tcp_flush_frame_to_output (vm, thread_index, 1);
1061 tcp_flush_frame_to_output (vm, thread_index, 0);
1062 tcp_flush_frame_to_ip_lookup (vm, thread_index, 1);
1063 tcp_flush_frame_to_ip_lookup (vm, thread_index, 0);
1070 tcp_send_fin (tcp_connection_t * tc)
1072 tcp_main_t *tm = vnet_get_tcp_main ();
1073 vlib_main_t *vm = vlib_get_main ();
1078 tcp_retransmit_timer_force_update (tc);
1079 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1081 b = vlib_get_buffer (vm, bi);
1082 tcp_init_buffer (vm, b);
1083 fin_snt = tc->flags & TCP_CONN_FINSNT;
1085 tc->snd_nxt = tc->snd_una;
1086 tcp_make_fin (tc, b);
1087 tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
1090 tc->flags |= TCP_CONN_FINSNT;
1091 tc->flags &= ~TCP_CONN_FINPNDG;
1092 /* Account for the FIN */
1093 tc->snd_una_max += 1;
1094 tc->snd_nxt = tc->snd_una_max;
1098 tc->snd_nxt = tc->snd_una_max;
1100 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1104 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1108 case TCP_STATE_ESTABLISHED:
1109 case TCP_STATE_CLOSE_WAIT:
1110 return TCP_FLAG_ACK;
1111 case TCP_STATE_SYN_RCVD:
1112 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1113 case TCP_STATE_SYN_SENT:
1114 return TCP_FLAG_SYN;
1115 case TCP_STATE_LAST_ACK:
1116 case TCP_STATE_FIN_WAIT_1:
1117 if (tc->snd_nxt + 1 < tc->snd_una_max)
1118 return TCP_FLAG_ACK;
1120 return TCP_FLAG_FIN;
1122 clib_warning ("Shouldn't be here!");
1128 * Push TCP header and update connection variables
1131 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1132 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1134 u32 advertise_wnd, data_len;
1135 u8 tcp_hdr_opts_len, flags;
1136 tcp_main_t *tm = &tcp_main;
1139 data_len = b->current_length;
1140 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1141 data_len += b->total_length_not_including_first_buffer;
1143 vnet_buffer (b)->tcp.flags = 0;
1144 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1147 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1149 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1152 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1154 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1156 flags = tcp_make_state_flags (tc, next_state);
1158 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1159 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1164 clib_memcpy ((u8 *) (th + 1),
1165 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1170 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1171 ASSERT (len == tc->snd_opts_len);
1175 * Update connection variables
1178 tc->snd_nxt += data_len;
1179 tc->rcv_las = tc->rcv_nxt;
1181 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1185 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1187 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1189 tc->snd_una_max = tc->snd_nxt;
1190 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1191 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1192 /* If not tracking an ACK, start tracking */
1193 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1195 tc->rtt_ts = tcp_time_now ();
1196 tc->rtt_seq = tc->snd_nxt;
1198 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1200 tcp_retransmit_timer_set (tc);
1203 tcp_trajectory_add_start (b, 3);
1208 tcp_send_ack (tcp_connection_t * tc)
1210 tcp_main_t *tm = vnet_get_tcp_main ();
1211 vlib_main_t *vm = vlib_get_main ();
1217 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1219 b = vlib_get_buffer (vm, bi);
1220 tcp_init_buffer (vm, b);
1222 /* Fill in the ACK */
1223 tcp_make_ack (tc, b);
1224 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1228 * Delayed ack timer handler
1230 * Sends delayed ACK when timer expires
1233 tcp_timer_delack_handler (u32 index)
1235 u32 thread_index = vlib_get_thread_index ();
1236 tcp_connection_t *tc;
1238 tc = tcp_connection_get (index, thread_index);
1239 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1244 * Build a retransmit segment
1246 * @return the number of bytes in the segment or 0 if there's nothing to
1250 tcp_prepare_retransmit_segment (tcp_connection_t * tc, u32 offset,
1251 u32 max_deq_bytes, vlib_buffer_t ** b)
1253 tcp_main_t *tm = vnet_get_tcp_main ();
1254 vlib_main_t *vm = vlib_get_main ();
1256 u32 start, bi, available_bytes, seg_size;
1259 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1260 ASSERT (max_deq_bytes != 0);
1263 * Make sure we can retransmit something
1265 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1266 ASSERT (available_bytes >= offset);
1267 available_bytes -= offset;
1268 if (!available_bytes)
1270 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1271 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1273 /* Start is beyond snd_congestion */
1274 start = tc->snd_una + offset;
1275 if (seq_geq (start, tc->snd_congestion))
1278 /* Don't overshoot snd_congestion */
1279 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1281 max_deq_bytes = tc->snd_congestion - start;
1282 if (max_deq_bytes == 0)
1286 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1291 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1294 * Allocate and fill in buffer(s)
1297 /* Easy case, buffer size greater than mss */
1298 if (PREDICT_TRUE (seg_size <= tm->bytes_per_buffer))
1300 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1302 *b = vlib_get_buffer (vm, bi);
1303 data = tcp_init_buffer (vm, *b);
1304 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1306 ASSERT (n_bytes == max_deq_bytes);
1307 b[0]->current_length = n_bytes;
1308 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1310 /* Split mss into multiple buffers */
1313 u32 chain_bi = ~0, n_bufs_per_seg;
1314 u32 thread_index = vlib_get_thread_index ();
1315 u16 n_peeked, len_to_deq, available_bufs;
1316 vlib_buffer_t *chain_b, *prev_b;
1319 /* Make sure we have enough buffers */
1320 n_bufs_per_seg = ceil ((double) seg_size / tm->bytes_per_buffer);
1321 available_bufs = vec_len (tm->wrk_ctx[thread_index].tx_buffers);
1322 if (n_bufs_per_seg > available_bufs)
1324 tcp_alloc_tx_buffers (tm, thread_index, &available_bufs,
1327 if (n_bufs_per_seg > available_bufs)
1334 tcp_get_free_buffer_index (tm, &bi);
1335 ASSERT (bi != (u32) ~ 0);
1336 *b = vlib_get_buffer (vm, bi);
1337 data = tcp_init_buffer (vm, *b);
1338 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1339 tm->bytes_per_buffer -
1341 b[0]->current_length = n_bytes;
1342 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1343 b[0]->total_length_not_including_first_buffer = 0;
1344 max_deq_bytes -= n_bytes;
1347 for (i = 1; i < n_bufs_per_seg; i++)
1350 len_to_deq = clib_min (max_deq_bytes, tm->bytes_per_buffer);
1351 tcp_get_free_buffer_index (tm, &chain_bi);
1352 ASSERT (chain_bi != (u32) ~ 0);
1353 chain_b = vlib_get_buffer (vm, chain_bi);
1354 chain_b->current_data = 0;
1355 data = vlib_buffer_get_current (chain_b);
1356 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1357 offset + n_bytes, len_to_deq);
1358 ASSERT (n_peeked == len_to_deq);
1359 n_bytes += n_peeked;
1360 chain_b->current_length = n_peeked;
1361 chain_b->next_buffer = 0;
1363 /* update previous buffer */
1364 prev_b->next_buffer = chain_bi;
1365 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1367 max_deq_bytes -= n_peeked;
1368 b[0]->total_length_not_including_first_buffer += n_peeked;
1371 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1374 ASSERT (n_bytes > 0);
1375 ASSERT (((*b)->current_data + (*b)->current_length) <=
1376 tm->bytes_per_buffer);
1378 if (tcp_in_fastrecovery (tc))
1379 tc->snd_rxt_bytes += n_bytes;
1382 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1387 * Reset congestion control, switch cwnd to loss window and try again.
1390 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1392 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1393 tc->prev_ssthresh = tc->ssthresh;
1394 tc->prev_cwnd = tc->cwnd;
1396 /* Cleanly recover cc (also clears up fast retransmit) */
1397 if (tcp_in_fastrecovery (tc))
1398 tcp_cc_fastrecovery_exit (tc);
1400 /* Start again from the beginning */
1401 tc->cc_algo->congestion (tc);
1402 tc->cwnd = tcp_loss_wnd (tc);
1403 tc->snd_congestion = tc->snd_una_max;
1405 tc->cwnd_acc_bytes = 0;
1407 tcp_recovery_on (tc);
1411 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1413 tcp_main_t *tm = vnet_get_tcp_main ();
1414 vlib_main_t *vm = vlib_get_main ();
1415 u32 thread_index = vlib_get_thread_index ();
1416 tcp_connection_t *tc;
1417 vlib_buffer_t *b = 0;
1422 tc = tcp_half_open_connection_get (index);
1423 /* Note: the connection may have transitioned to ESTABLISHED... */
1424 if (PREDICT_FALSE (tc == 0))
1426 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1430 tc = tcp_connection_get (index, thread_index);
1431 /* Note: the connection may have been closed and pool_put */
1432 if (PREDICT_FALSE (tc == 0))
1434 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1437 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1439 if (tc->state >= TCP_STATE_ESTABLISHED)
1441 /* Lost FIN, retransmit and return */
1442 if (tcp_is_lost_fin (tc))
1446 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1450 /* Shouldn't be here */
1451 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1452 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)))
1454 tcp_recovery_off (tc);
1458 /* We're not in recovery so make sure rto_boff is 0 */
1459 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1462 tcp_update_rto (tc);
1465 /* Increment RTO backoff (also equal to number of retries) and go back
1466 * to first un-acked byte */
1469 /* First retransmit timeout */
1470 if (tc->rto_boff == 1)
1471 tcp_rxt_timeout_cc (tc);
1473 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1474 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1476 /* Send one segment. Note that n_bytes may be zero due to buffer shortfall */
1477 n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
1479 /* TODO be less aggressive about this */
1480 scoreboard_clear (&tc->sack_sb);
1484 tcp_retransmit_timer_set (tc);
1488 bi = vlib_get_buffer_index (vm, b);
1490 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1491 if (tc->rto_boff == 1)
1492 tc->snd_rxt_ts = tcp_time_now ();
1494 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1495 tcp_retransmit_timer_update (tc);
1497 /* Retransmit for SYN */
1498 else if (tc->state == TCP_STATE_SYN_SENT)
1500 /* Half-open connection actually moved to established but we were
1501 * waiting for syn retransmit to pop to call cleanup from the right
1503 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1505 if (tcp_half_open_connection_cleanup (tc))
1507 clib_warning ("could not remove half-open connection");
1513 /* Try without increasing RTO a number of times. If this fails,
1514 * start growing RTO exponentially */
1516 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1517 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1519 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1520 tc->rto * TCP_TO_TIMER_TICK);
1522 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1525 b = vlib_get_buffer (vm, bi);
1526 tcp_init_buffer (vm, b);
1527 tcp_make_syn (tc, b);
1530 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1532 /* This goes straight to ipx_lookup. Retransmit timer set already */
1533 tcp_push_ip_hdr (tm, tc, b);
1534 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
1536 /* Retransmit SYN-ACK */
1537 else if (tc->state == TCP_STATE_SYN_RCVD)
1540 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1541 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1544 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1546 tcp_retransmit_timer_force_update (tc);
1550 b = vlib_get_buffer (vm, bi);
1551 tcp_init_buffer (vm, b);
1552 tcp_make_synack (tc, b);
1553 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1555 /* Retransmit timer already updated, just enqueue to output */
1556 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1560 ASSERT (tc->state == TCP_STATE_CLOSED);
1566 tcp_timer_retransmit_handler (u32 index)
1568 tcp_timer_retransmit_handler_i (index, 0);
1572 tcp_timer_retransmit_syn_handler (u32 index)
1574 tcp_timer_retransmit_handler_i (index, 1);
1578 * Got 0 snd_wnd from peer, try to do something about it.
1582 tcp_timer_persist_handler (u32 index)
1584 tcp_main_t *tm = vnet_get_tcp_main ();
1585 vlib_main_t *vm = vlib_get_main ();
1586 u32 thread_index = vlib_get_thread_index ();
1587 tcp_connection_t *tc;
1589 u32 bi, max_snd_bytes, available_bytes, offset;
1593 tc = tcp_connection_get_if_valid (index, thread_index);
1598 /* Make sure timer handle is set to invalid */
1599 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1601 /* Problem already solved or worse */
1602 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1603 || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1606 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1607 offset = tc->snd_una_max - tc->snd_una;
1609 /* Reprogram persist if no new bytes available to send. We may have data
1611 if (!available_bytes)
1613 tcp_persist_timer_set (tc);
1617 if (available_bytes <= offset)
1619 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1623 /* Increment RTO backoff */
1625 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1628 * Try to force the first unsent segment (or buffer)
1630 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1632 b = vlib_get_buffer (vm, bi);
1633 data = tcp_init_buffer (vm, b);
1635 tcp_validate_txf_size (tc, offset);
1636 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1637 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1638 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1640 b->current_length = n_bytes;
1641 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1642 || tc->snd_nxt == tc->snd_una_max
1643 || tc->rto_boff > 1));
1645 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1646 tc->snd_una_max = tc->snd_nxt;
1647 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1648 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1650 /* Just sent new data, enable retransmit */
1651 tcp_retransmit_timer_update (tc);
1655 * Retransmit first unacked segment
1658 tcp_retransmit_first_unacked (tcp_connection_t * tc)
1660 vlib_main_t *vm = vlib_get_main ();
1662 u32 bi, old_snd_nxt, n_bytes;
1664 old_snd_nxt = tc->snd_nxt;
1665 tc->snd_nxt = tc->snd_una;
1667 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1668 n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
1671 bi = vlib_get_buffer_index (vm, b);
1672 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1674 tc->snd_nxt = old_snd_nxt;
1678 * Do fast retransmit with SACKs
1681 tcp_fast_retransmit_sack (tcp_connection_t * tc)
1683 vlib_main_t *vm = vlib_get_main ();
1684 u32 n_written = 0, offset, max_bytes, n_segs = 0;
1685 vlib_buffer_t *b = 0;
1686 sack_scoreboard_hole_t *hole;
1687 sack_scoreboard_t *sb;
1688 u32 bi, old_snd_nxt;
1690 u8 snd_limited = 0, can_rescue = 0;
1692 ASSERT (tcp_in_fastrecovery (tc));
1694 old_snd_nxt = tc->snd_nxt;
1696 snd_space = tcp_available_cc_snd_space (tc);
1698 if (snd_space < tc->snd_mss)
1701 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1702 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1703 while (hole && snd_space > 0 && n_segs++ < VLIB_FRAME_SIZE)
1705 hole = scoreboard_next_rxt_hole (sb, hole,
1706 tcp_fastrecovery_sent_1_smss (tc),
1707 &can_rescue, &snd_limited);
1710 if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
1711 || seq_gt (sb->rescue_rxt,
1712 tc->snd_congestion)))
1715 /* If rescue rxt undefined or less than snd_una then one segment of
1716 * up to SMSS octets that MUST include the highest outstanding
1717 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1718 * RecoveryPoint. HighRxt MUST NOT be updated.
1720 max_bytes = clib_min (tc->snd_mss,
1721 tc->snd_congestion - tc->snd_una);
1722 max_bytes = clib_min (max_bytes, snd_space);
1723 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1724 sb->rescue_rxt = tc->snd_congestion;
1725 tc->snd_nxt = tc->snd_una + offset;
1726 n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes,
1731 bi = vlib_get_buffer_index (vm, b);
1732 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1736 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1737 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1740 offset = sb->high_rxt - tc->snd_una;
1741 tc->snd_nxt = sb->high_rxt;
1742 n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes, &b);
1744 /* Nothing left to retransmit */
1748 bi = vlib_get_buffer_index (vm, b);
1749 sb->high_rxt += n_written;
1750 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1751 ASSERT (n_written <= snd_space);
1752 snd_space -= n_written;
1756 /* If window allows, send 1 SMSS of new data */
1757 tc->snd_nxt = old_snd_nxt;
1761 * Fast retransmit without SACK info
1764 tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
1766 vlib_main_t *vm = vlib_get_main ();
1767 u32 n_written = 0, offset = 0, bi, old_snd_nxt;
1771 ASSERT (tcp_in_fastrecovery (tc));
1772 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1774 /* Start resending from first un-acked segment */
1775 old_snd_nxt = tc->snd_nxt;
1776 tc->snd_nxt = tc->snd_una;
1777 snd_space = tcp_available_cc_snd_space (tc);
1779 while (snd_space > 0)
1781 offset += n_written;
1782 n_written = tcp_prepare_retransmit_segment (tc, offset, snd_space, &b);
1784 /* Nothing left to retransmit */
1788 bi = vlib_get_buffer_index (vm, b);
1789 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1790 snd_space -= n_written;
1793 /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
1794 tc->snd_nxt = old_snd_nxt;
1798 * Do fast retransmit
1801 tcp_fast_retransmit (tcp_connection_t * tc)
1803 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1804 tcp_fast_retransmit_sack (tc);
1806 tcp_fast_retransmit_no_sack (tc);
1810 tcp_session_has_ooo_data (tcp_connection_t * tc)
1812 stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index);
1813 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1817 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1818 u16 * next0, u32 * error0)
1820 ip_adjacency_t *adj;
1823 /* Not thread safe but as long as the connection exists the adj should
1825 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1827 if (ai == ADJ_INDEX_INVALID)
1829 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1830 *next0 = TCP_OUTPUT_NEXT_DROP;
1831 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1836 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1837 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1838 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1839 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1842 *next0 = TCP_OUTPUT_NEXT_DROP;
1843 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1845 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
1849 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1850 u32 * to_next, u32 n_bufs)
1852 u32 n_trace = vlib_get_trace_count (vm, node);
1853 tcp_connection_t *tc;
1859 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
1861 b = vlib_get_buffer (vm, to_next[i]);
1862 th = vlib_buffer_get_current (b);
1863 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
1865 t = vlib_add_trace (vm, node, b, sizeof (*t));
1866 clib_memcpy (&t->tcp_header, th, sizeof (t->tcp_header));
1867 clib_memcpy (&t->tcp_connection, tc, sizeof (t->tcp_connection));
1872 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
1873 tcp_connection_t * tc0, u8 is_ip4)
1875 tcp_header_t *th0 = 0;
1877 th0 = vlib_buffer_get_current (b0);
1878 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1881 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
1882 IP_PROTOCOL_TCP, 1);
1883 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1884 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1890 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1891 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1892 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1893 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
1894 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1900 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
1901 u32 * error0, u16 * next0, u8 is_ip4)
1904 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
1906 *error0 = TCP_ERROR_INVALID_CONNECTION;
1907 *next0 = TCP_OUTPUT_NEXT_DROP;
1911 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
1912 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1916 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
1917 tcp_output_handle_link_local (tc0, b0, next0, error0);
1920 /* Filter out DUPACKs if there are no OOO segments left */
1921 if (PREDICT_FALSE (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1923 /* N.B. Should not filter burst of dupacks. Two issues:
1924 * 1) dupacks open cwnd on remote peer when congested
1925 * 2) acks leaving should have the latest rcv_wnd since the
1926 * burst may have eaten up all of it, so only the old ones
1927 * could be filtered.
1929 if (!tcp_session_has_ooo_data (tc0))
1931 *error0 = TCP_ERROR_FILTERED_DUPACKS;
1932 *next0 = TCP_OUTPUT_NEXT_DROP;
1937 /* Stop DELACK timer and fix flags */
1938 tc0->flags &= ~(TCP_CONN_SNDACK);
1939 if (!TCP_ALWAYS_ACK)
1940 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
1944 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1945 vlib_frame_t * frame, int is_ip4)
1947 u32 n_left_from, *from, thread_index = vm->thread_index;
1948 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1949 u16 nexts[VLIB_FRAME_SIZE], *next;
1951 from = vlib_frame_vector_args (frame);
1952 n_left_from = frame->n_vectors;
1953 tcp_set_time_now (thread_index);
1955 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
1956 tcp46_output_trace_frame (vm, node, from, n_left_from);
1958 vlib_get_buffers (vm, from, bufs, n_left_from);
1962 while (n_left_from >= 4)
1964 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
1965 tcp_connection_t *tc0, *tc1;
1968 vlib_prefetch_buffer_header (b[2], STORE);
1969 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
1971 vlib_prefetch_buffer_header (b[3], STORE);
1972 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
1975 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
1977 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
1979 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
1982 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
1983 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
1985 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
1986 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
1992 while (n_left_from > 0)
1994 u32 error0 = TCP_ERROR_PKTS_SENT;
1995 tcp_connection_t *tc0;
1997 if (n_left_from > 1)
1999 vlib_prefetch_buffer_header (b[0], STORE);
2000 CLIB_PREFETCH (b[0]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2003 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2004 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2007 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2008 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2015 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2016 return frame->n_vectors;
2020 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2021 vlib_frame_t * from_frame)
2023 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2027 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2028 vlib_frame_t * from_frame)
2030 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2034 VLIB_REGISTER_NODE (tcp4_output_node) =
2036 .function = tcp4_output,.name = "tcp4-output",
2037 /* Takes a vector of packets. */
2038 .vector_size = sizeof (u32),
2039 .n_errors = TCP_N_ERROR,
2040 .error_strings = tcp_error_strings,
2041 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2043 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2044 foreach_tcp4_output_next
2047 .format_buffer = format_tcp_header,
2048 .format_trace = format_tcp_tx_trace,
2052 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2055 VLIB_REGISTER_NODE (tcp6_output_node) =
2057 .function = tcp6_output,
2058 .name = "tcp6-output",
2059 /* Takes a vector of packets. */
2060 .vector_size = sizeof (u32),
2061 .n_errors = TCP_N_ERROR,
2062 .error_strings = tcp_error_strings,
2063 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2065 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2066 foreach_tcp6_output_next
2069 .format_buffer = format_tcp_header,
2070 .format_trace = format_tcp_tx_trace,
2074 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2076 typedef enum _tcp_reset_next
2078 TCP_RESET_NEXT_DROP,
2079 TCP_RESET_NEXT_IP_LOOKUP,
2083 #define foreach_tcp4_reset_next \
2084 _(DROP, "error-drop") \
2085 _(IP_LOOKUP, "ip4-lookup")
2087 #define foreach_tcp6_reset_next \
2088 _(DROP, "error-drop") \
2089 _(IP_LOOKUP, "ip6-lookup")
2092 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2093 vlib_frame_t * from_frame, u8 is_ip4)
2095 u32 n_left_from, next_index, *from, *to_next;
2096 u32 my_thread_index = vm->thread_index;
2098 from = vlib_frame_vector_args (from_frame);
2099 n_left_from = from_frame->n_vectors;
2101 next_index = node->cached_next_index;
2103 while (n_left_from > 0)
2107 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2109 while (n_left_from > 0 && n_left_to_next > 0)
2115 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2122 n_left_to_next -= 1;
2124 b0 = vlib_get_buffer (vm, bi0);
2126 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2127 my_thread_index, is_ip4))
2129 error0 = TCP_ERROR_LOOKUP_DROPS;
2130 next0 = TCP_RESET_NEXT_DROP;
2134 /* Prepare to send to IP lookup */
2135 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2136 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2139 b0->error = node->errors[error0];
2140 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2141 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2143 th0 = vlib_buffer_get_current (b0);
2145 th0 = ip4_next_header ((ip4_header_t *) th0);
2147 th0 = ip6_next_header ((ip6_header_t *) th0);
2148 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2149 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
2152 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2153 n_left_to_next, bi0, next0);
2155 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2157 return from_frame->n_vectors;
2161 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2162 vlib_frame_t * from_frame)
2164 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2168 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2169 vlib_frame_t * from_frame)
2171 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2175 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2176 .function = tcp4_send_reset,
2177 .name = "tcp4-reset",
2178 .vector_size = sizeof (u32),
2179 .n_errors = TCP_N_ERROR,
2180 .error_strings = tcp_error_strings,
2181 .n_next_nodes = TCP_RESET_N_NEXT,
2183 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2184 foreach_tcp4_reset_next
2187 .format_trace = format_tcp_tx_trace,
2191 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2194 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2195 .function = tcp6_send_reset,
2196 .name = "tcp6-reset",
2197 .vector_size = sizeof (u32),
2198 .n_errors = TCP_N_ERROR,
2199 .error_strings = tcp_error_strings,
2200 .n_next_nodes = TCP_RESET_N_NEXT,
2202 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2203 foreach_tcp6_reset_next
2206 .format_trace = format_tcp_tx_trace,
2210 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2213 * fd.io coding-style-patch-verification: ON
2216 * eval: (c-set-style "gnu")