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)
121 tcp_main_t *tm = &tcp_main;
124 /* Initial wnd for SYN. Fifos are not allocated yet.
125 * Use some predefined value. For SYN-ACK we still want the
126 * scale to be computed in the same way */
127 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
129 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
130 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
132 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
136 tcp_update_rcv_wnd (tcp_connection_t * tc)
139 u32 available_space, max_fifo, wnd;
142 * Figure out how much space we have available
144 available_space = transport_max_rx_enqueue (&tc->connection);
145 max_fifo = transport_rx_fifo_size (&tc->connection);
147 ASSERT (tc->rcv_opts.mss < max_fifo);
148 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
152 * Use the above and what we know about what we've previously advertised
153 * to compute the new window
155 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
156 if (observed_wnd < 0)
159 /* Bad. Thou shalt not shrink */
160 if (available_space < observed_wnd)
163 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
167 wnd = available_space;
170 /* Make sure we have a multiple of rcv_wscale */
171 if (wnd && tc->rcv_wscale)
173 wnd &= ~(1 << tc->rcv_wscale);
175 wnd = 1 << tc->rcv_wscale;
178 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
182 * Compute and return window to advertise, scaled as per RFC1323
185 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
187 if (state < TCP_STATE_ESTABLISHED)
188 return tcp_initial_window_to_advertise (tc);
190 tcp_update_rcv_wnd (tc);
192 if (tc->rcv_wnd == 0)
194 tc->flags |= TCP_CONN_SENT_RCV_WND0;
198 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
201 return tc->rcv_wnd >> tc->rcv_wscale;
205 * Write TCP options to segment.
208 tcp_options_write (u8 * data, tcp_options_t * opts)
211 u32 buf, seq_len = 4;
213 if (tcp_opts_mss (opts))
215 *data++ = TCP_OPTION_MSS;
216 *data++ = TCP_OPTION_LEN_MSS;
217 buf = clib_host_to_net_u16 (opts->mss);
218 clib_memcpy (data, &buf, sizeof (opts->mss));
219 data += sizeof (opts->mss);
220 opts_len += TCP_OPTION_LEN_MSS;
223 if (tcp_opts_wscale (opts))
225 *data++ = TCP_OPTION_WINDOW_SCALE;
226 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
227 *data++ = opts->wscale;
228 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
231 if (tcp_opts_sack_permitted (opts))
233 *data++ = TCP_OPTION_SACK_PERMITTED;
234 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
235 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
238 if (tcp_opts_tstamp (opts))
240 *data++ = TCP_OPTION_TIMESTAMP;
241 *data++ = TCP_OPTION_LEN_TIMESTAMP;
242 buf = clib_host_to_net_u32 (opts->tsval);
243 clib_memcpy (data, &buf, sizeof (opts->tsval));
244 data += sizeof (opts->tsval);
245 buf = clib_host_to_net_u32 (opts->tsecr);
246 clib_memcpy (data, &buf, sizeof (opts->tsecr));
247 data += sizeof (opts->tsecr);
248 opts_len += TCP_OPTION_LEN_TIMESTAMP;
251 if (tcp_opts_sack (opts))
254 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
255 TCP_OPTS_MAX_SACK_BLOCKS);
257 if (n_sack_blocks != 0)
259 *data++ = TCP_OPTION_SACK_BLOCK;
260 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
261 for (i = 0; i < n_sack_blocks; i++)
263 buf = clib_host_to_net_u32 (opts->sacks[i].start);
264 clib_memcpy (data, &buf, seq_len);
266 buf = clib_host_to_net_u32 (opts->sacks[i].end);
267 clib_memcpy (data, &buf, seq_len);
270 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
274 /* Terminate TCP options */
277 *data++ = TCP_OPTION_EOL;
278 opts_len += TCP_OPTION_LEN_EOL;
281 /* Pad with zeroes to a u32 boundary */
284 *data++ = TCP_OPTION_NOOP;
285 opts_len += TCP_OPTION_LEN_NOOP;
291 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
295 opts->flags |= TCP_OPTS_FLAG_MSS;
296 opts->mss = dummy_mtu; /*XXX discover that */
297 len += TCP_OPTION_LEN_MSS;
299 opts->flags |= TCP_OPTS_FLAG_WSCALE;
300 opts->wscale = wnd_scale;
301 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
304 opts->tsval = tcp_time_now ();
306 len += TCP_OPTION_LEN_TIMESTAMP;
310 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
311 len += TCP_OPTION_LEN_SACK_PERMITTED;
314 /* Align to needed boundary */
315 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
320 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
324 opts->flags |= TCP_OPTS_FLAG_MSS;
326 len += TCP_OPTION_LEN_MSS;
328 if (tcp_opts_wscale (&tc->rcv_opts))
330 opts->flags |= TCP_OPTS_FLAG_WSCALE;
331 opts->wscale = tc->rcv_wscale;
332 len += TCP_OPTION_LEN_WINDOW_SCALE;
335 if (tcp_opts_tstamp (&tc->rcv_opts))
337 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
338 opts->tsval = tcp_time_now ();
339 opts->tsecr = tc->tsval_recent;
340 len += TCP_OPTION_LEN_TIMESTAMP;
343 if (tcp_opts_sack_permitted (&tc->rcv_opts))
345 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
346 len += TCP_OPTION_LEN_SACK_PERMITTED;
349 /* Align to needed boundary */
350 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
355 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
361 if (tcp_opts_tstamp (&tc->rcv_opts))
363 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
364 opts->tsval = tcp_time_now ();
365 opts->tsecr = tc->tsval_recent;
366 len += TCP_OPTION_LEN_TIMESTAMP;
368 if (tcp_opts_sack_permitted (&tc->rcv_opts))
370 if (vec_len (tc->snd_sacks))
372 opts->flags |= TCP_OPTS_FLAG_SACK;
373 opts->sacks = tc->snd_sacks;
374 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
375 TCP_OPTS_MAX_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_FIN_WAIT_1:
393 case TCP_STATE_CLOSED:
394 case TCP_STATE_CLOSE_WAIT:
395 return tcp_make_established_options (tc, opts);
396 case TCP_STATE_SYN_RCVD:
397 return tcp_make_synack_options (tc, opts);
398 case TCP_STATE_SYN_SENT:
399 return tcp_make_syn_options (opts, tc->rcv_wscale);
401 clib_warning ("State not handled! %d", state);
407 * Update burst send vars
409 * - Updates snd_mss to reflect the effective segment size that we can send
410 * by taking into account all TCP options, including SACKs.
411 * - Cache 'on the wire' options for reuse
412 * - Updates receive window which can be reused for a burst.
414 * This should *only* be called when doing bursts
417 tcp_update_burst_snd_vars (tcp_connection_t * tc)
419 tcp_main_t *tm = &tcp_main;
421 /* Compute options to be used for connection. These may be reused when
422 * sending data or to compute the effective mss (snd_mss) */
423 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
424 TCP_STATE_ESTABLISHED);
426 /* XXX check if MTU has been updated */
427 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
428 ASSERT (tc->snd_mss > 0);
430 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
433 tcp_update_rcv_wnd (tc);
437 tcp_init_mss (tcp_connection_t * tc)
439 u16 default_min_mss = 536;
440 tcp_update_rcv_mss (tc);
442 /* TODO cache mss and consider PMTU discovery */
443 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
445 if (tc->snd_mss < 45)
447 clib_warning ("snd mss is 0");
448 /* Assume that at least the min default mss works */
449 tc->snd_mss = default_min_mss;
450 tc->rcv_opts.mss = default_min_mss;
453 /* We should have enough space for 40 bytes of options */
454 ASSERT (tc->snd_mss > 45);
456 /* If we use timestamp option, account for it */
457 if (tcp_opts_tstamp (&tc->rcv_opts))
458 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
462 tcp_alloc_tx_buffers (tcp_main_t * tm, u8 thread_index, u16 * n_bufs,
465 tcp_worker_ctx_t *ctx = &tm->wrk_ctx[thread_index];
466 vlib_main_t *vm = vlib_get_main ();
469 ASSERT (wanted > *n_bufs);
470 vec_validate_aligned (ctx->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
471 n_alloc = vlib_buffer_alloc (vm, &ctx->tx_buffers[*n_bufs],
474 _vec_len (ctx->tx_buffers) = *n_bufs;
479 tcp_get_free_buffer_index (tcp_main_t * tm, u32 * bidx)
481 u32 thread_index = vlib_get_thread_index ();
482 tcp_worker_ctx_t *ctx = &tm->wrk_ctx[thread_index];
483 u16 n_bufs = vec_len (ctx->tx_buffers);
485 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (thread_index);
487 if (PREDICT_FALSE (!n_bufs))
489 if (!tcp_alloc_tx_buffers (tm, thread_index, &n_bufs, VLIB_FRAME_SIZE))
495 *bidx = ctx->tx_buffers[--n_bufs];
496 _vec_len (ctx->tx_buffers) = n_bufs;
501 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
503 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
504 vlib_buffer_free_one (vm, b->next_buffer);
505 /* Zero all flags but free list index and trace flag */
506 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
508 b->current_length = 0;
509 b->total_length_not_including_first_buffer = 0;
510 vnet_buffer (b)->tcp.flags = 0;
512 /* Leave enough space for headers */
513 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
517 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
519 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
520 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
521 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
522 b->total_length_not_including_first_buffer = 0;
524 vnet_buffer (b)->tcp.flags = 0;
525 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
526 /* Leave enough space for headers */
527 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
534 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
537 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
538 u8 tcp_opts_len, tcp_hdr_opts_len;
542 wnd = tcp_window_to_advertise (tc, state);
544 /* Make and write options */
545 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
546 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
548 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
549 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
551 tcp_options_write ((u8 *) (th + 1), snd_opts);
552 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
556 * Convert buffer to ACK
559 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
561 vlib_main_t *vm = vlib_get_main ();
563 tcp_reuse_buffer (vm, b);
564 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
565 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
566 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
567 tc->rcv_las = tc->rcv_nxt;
571 * Convert buffer to FIN-ACK
574 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
576 vlib_main_t *vm = vlib_get_main ();
579 tcp_reuse_buffer (vm, b);
581 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
582 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
584 /* Reset flags, make sure ack is sent */
585 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
589 * Convert buffer to SYN
592 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
594 u8 tcp_hdr_opts_len, tcp_opts_len;
597 tcp_options_t snd_opts;
599 initial_wnd = tcp_initial_window_to_advertise (tc);
601 /* Make and write options */
602 memset (&snd_opts, 0, sizeof (snd_opts));
603 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
604 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
606 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
607 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
609 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
610 tcp_options_write ((u8 *) (th + 1), &snd_opts);
614 * Convert buffer to SYN-ACK
617 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
619 vlib_main_t *vm = vlib_get_main ();
620 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
621 u8 tcp_opts_len, tcp_hdr_opts_len;
625 memset (snd_opts, 0, sizeof (*snd_opts));
626 tcp_reuse_buffer (vm, b);
628 initial_wnd = tcp_initial_window_to_advertise (tc);
629 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
630 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
632 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
633 tc->rcv_nxt, tcp_hdr_opts_len,
634 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
635 tcp_options_write ((u8 *) (th + 1), snd_opts);
637 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
638 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
640 /* Init retransmit timer. Use update instead of set because of
642 tcp_retransmit_timer_force_update (tc);
643 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
647 tcp_enqueue_to_ip_lookup_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
648 u8 is_ip4, u32 fib_index, u8 flush)
650 tcp_main_t *tm = vnet_get_tcp_main ();
651 u32 thread_index = vlib_get_thread_index ();
652 u32 *to_next, next_index;
655 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
658 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
659 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
661 /* Send to IP lookup */
662 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
663 tcp_trajectory_add_start (b, 1);
665 f = tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4];
668 f = vlib_get_frame_to_node (vm, next_index);
670 tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = f;
673 to_next = vlib_frame_vector_args (f);
674 to_next[f->n_vectors] = bi;
676 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
678 vlib_put_frame_to_node (vm, next_index, f);
679 tm->wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = 0;
684 tcp_enqueue_to_ip_lookup_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
685 u8 is_ip4, u32 fib_index)
687 tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, fib_index, 1);
691 tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
692 u8 is_ip4, u32 fib_index)
694 tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, fib_index, 0);
695 if (vm->thread_index == 0 && vlib_num_workers ())
696 session_flush_frames_main_thread (vm);
700 tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
703 tcp_main_t *tm = vnet_get_tcp_main ();
704 u32 thread_index = vlib_get_thread_index ();
705 u32 *to_next, next_index;
708 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
711 /* Decide where to send the packet */
712 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
713 tcp_trajectory_add_start (b, 2);
715 /* Get frame to v4/6 output node */
716 f = tm->wrk_ctx[thread_index].tx_frames[!is_ip4];
719 f = vlib_get_frame_to_node (vm, next_index);
721 tm->wrk_ctx[thread_index].tx_frames[!is_ip4] = f;
723 to_next = vlib_frame_vector_args (f);
724 to_next[f->n_vectors] = bi;
726 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
728 vlib_put_frame_to_node (vm, next_index, f);
729 tm->wrk_ctx[thread_index].tx_frames[!is_ip4] = 0;
734 tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
736 tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
740 tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
743 tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
747 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
748 tcp_state_t state, u8 thread_index, u8 is_ip4)
753 ip4_address_t src_ip40, dst_ip40;
754 ip6_address_t src_ip60, dst_ip60;
755 u16 src_port, dst_port;
760 /* Find IP and TCP headers */
761 th0 = tcp_buffer_hdr (b0);
763 /* Save src and dst ip */
766 ih4 = vlib_buffer_get_current (b0);
767 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
768 src_ip40.as_u32 = ih4->src_address.as_u32;
769 dst_ip40.as_u32 = ih4->dst_address.as_u32;
773 ih6 = vlib_buffer_get_current (b0);
774 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
775 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
776 clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
779 src_port = th0->src_port;
780 dst_port = th0->dst_port;
782 /* Try to determine what/why we're actually resetting */
783 if (state == TCP_STATE_CLOSED)
788 tmp = clib_net_to_host_u32 (th0->seq_number);
790 /* Got a SYN for no listener. */
791 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
792 ack = clib_host_to_net_u32 (tmp + 1);
797 flags = TCP_FLAG_RST;
798 seq = th0->ack_number;
802 tcp_reuse_buffer (vm, b0);
803 tcp_trajectory_add_start (b0, 4);
804 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
805 sizeof (tcp_header_t), flags, 0);
809 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
811 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
816 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
818 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
826 * Send reset without reusing existing buffer
828 * It extracts connection info out of original packet
831 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
834 u32 bi, sw_if_index, fib_index;
835 tcp_main_t *tm = vnet_get_tcp_main ();
836 vlib_main_t *vm = vlib_get_main ();
837 u8 tcp_hdr_len, flags = 0;
838 tcp_header_t *th, *pkt_th;
840 ip4_header_t *ih4, *pkt_ih4;
841 ip6_header_t *ih6, *pkt_ih6;
842 fib_protocol_t fib_proto;
844 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
847 b = vlib_get_buffer (vm, bi);
848 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
849 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
850 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
851 tcp_init_buffer (vm, b);
853 /* Make and write options */
854 tcp_hdr_len = sizeof (tcp_header_t);
858 pkt_ih4 = vlib_buffer_get_current (pkt);
859 pkt_th = ip4_next_header (pkt_ih4);
863 pkt_ih6 = vlib_buffer_get_current (pkt);
864 pkt_th = ip6_next_header (pkt_ih6);
867 if (tcp_ack (pkt_th))
869 flags = TCP_FLAG_RST;
870 seq = pkt_th->ack_number;
871 ack = (tc && tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
875 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
877 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
880 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
881 seq, ack, tcp_hdr_len, flags, 0);
883 /* Swap src and dst ip */
886 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
887 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
888 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
889 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
894 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
896 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
897 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
898 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
902 tcp_enqueue_to_ip_lookup_now (vm, b, bi, is_ip4, fib_index);
903 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
907 * Build and set reset packet for connection
910 tcp_send_reset (tcp_connection_t * tc)
912 vlib_main_t *vm = vlib_get_main ();
913 tcp_main_t *tm = vnet_get_tcp_main ();
917 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
920 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
922 b = vlib_get_buffer (vm, bi);
923 tcp_init_buffer (vm, b);
925 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
926 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
927 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
928 flags = TCP_FLAG_RST;
929 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
930 tc->rcv_nxt, tcp_hdr_opts_len, flags,
932 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
933 ASSERT (opts_write_len == tc->snd_opts_len);
934 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
938 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
939 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
940 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
946 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
947 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
948 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
951 tcp_enqueue_to_ip_lookup_now (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
952 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
956 tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
958 tcp_header_t *th = vlib_buffer_get_current (b);
959 vlib_main_t *vm = vlib_get_main ();
963 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
964 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
965 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
972 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
973 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
974 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
982 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
983 * The packet is not forwarded through tcpx_output to avoid doing lookups
984 * in the half_open pool.
987 tcp_send_syn (tcp_connection_t * tc)
991 tcp_main_t *tm = vnet_get_tcp_main ();
992 vlib_main_t *vm = vlib_get_main ();
995 * Setup retransmit and establish timers before requesting buffer
996 * such that we can return if we've ran out.
998 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
999 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1000 tc->rto * TCP_TO_TIMER_TICK);
1002 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1005 b = vlib_get_buffer (vm, bi);
1006 tcp_init_buffer (vm, b);
1007 tcp_make_syn (tc, b);
1009 /* Measure RTT with this */
1010 tc->rtt_ts = tcp_time_now ();
1011 tc->rtt_seq = tc->snd_nxt;
1014 tcp_push_ip_hdr (tm, tc, b);
1015 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
1016 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1020 * Flush tx frame populated by retransmits and timer pops
1023 tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
1025 if (tcp_main.wrk_ctx[thread_index].tx_frames[!is_ip4])
1028 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1029 vlib_put_frame_to_node (vm, next_index,
1031 wrk_ctx[thread_index].tx_frames[!is_ip4]);
1032 tcp_main.wrk_ctx[thread_index].tx_frames[!is_ip4] = 0;
1037 * Flush ip lookup tx frames populated by timer pops
1040 tcp_flush_frame_to_ip_lookup (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
1042 if (tcp_main.wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4])
1045 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1046 vlib_put_frame_to_node (vm, next_index,
1048 wrk_ctx[thread_index].ip_lookup_tx_frames
1050 tcp_main.wrk_ctx[thread_index].ip_lookup_tx_frames[!is_ip4] = 0;
1055 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1058 tcp_flush_frames_to_output (u8 thread_index)
1060 vlib_main_t *vm = vlib_get_main ();
1061 tcp_flush_frame_to_output (vm, thread_index, 1);
1062 tcp_flush_frame_to_output (vm, thread_index, 0);
1063 tcp_flush_frame_to_ip_lookup (vm, thread_index, 1);
1064 tcp_flush_frame_to_ip_lookup (vm, thread_index, 0);
1071 tcp_send_fin (tcp_connection_t * tc)
1073 tcp_main_t *tm = vnet_get_tcp_main ();
1074 vlib_main_t *vm = vlib_get_main ();
1079 tcp_retransmit_timer_force_update (tc);
1080 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1082 b = vlib_get_buffer (vm, bi);
1083 tcp_init_buffer (vm, b);
1084 fin_snt = tc->flags & TCP_CONN_FINSNT;
1086 tc->snd_nxt = tc->snd_una;
1087 tcp_make_fin (tc, b);
1088 tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
1091 tc->flags |= TCP_CONN_FINSNT;
1092 tc->flags &= ~TCP_CONN_FINPNDG;
1093 /* Account for the FIN */
1094 tc->snd_una_max += 1;
1095 tc->snd_nxt = tc->snd_una_max;
1099 tc->snd_nxt = tc->snd_una_max;
1101 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1105 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1109 case TCP_STATE_ESTABLISHED:
1110 case TCP_STATE_CLOSE_WAIT:
1111 return TCP_FLAG_ACK;
1112 case TCP_STATE_SYN_RCVD:
1113 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1114 case TCP_STATE_SYN_SENT:
1115 return TCP_FLAG_SYN;
1116 case TCP_STATE_LAST_ACK:
1117 case TCP_STATE_FIN_WAIT_1:
1118 if (tc->snd_nxt + 1 < tc->snd_una_max)
1119 return TCP_FLAG_ACK;
1121 return TCP_FLAG_FIN;
1123 clib_warning ("Shouldn't be here!");
1129 * Push TCP header and update connection variables
1132 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1133 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1135 u32 advertise_wnd, data_len;
1136 u8 tcp_hdr_opts_len, flags;
1137 tcp_main_t *tm = &tcp_main;
1140 data_len = b->current_length;
1141 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1142 data_len += b->total_length_not_including_first_buffer;
1144 vnet_buffer (b)->tcp.flags = 0;
1145 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1148 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1150 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1153 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1155 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1157 flags = tcp_make_state_flags (tc, next_state);
1159 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1160 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1165 clib_memcpy ((u8 *) (th + 1),
1166 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1171 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1172 ASSERT (len == tc->snd_opts_len);
1176 * Update connection variables
1179 tc->snd_nxt += data_len;
1180 tc->rcv_las = tc->rcv_nxt;
1182 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1186 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1188 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1190 tc->snd_una_max = tc->snd_nxt;
1191 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd
1192 + tcp_fastrecovery_sent_1_smss (tc) * tc->snd_mss));
1193 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1194 /* If not tracking an ACK, start tracking */
1195 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1197 tc->rtt_ts = tcp_time_now ();
1198 tc->rtt_seq = tc->snd_nxt;
1200 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1202 tcp_retransmit_timer_set (tc);
1205 tcp_trajectory_add_start (b, 3);
1210 tcp_send_ack (tcp_connection_t * tc)
1212 tcp_main_t *tm = vnet_get_tcp_main ();
1213 vlib_main_t *vm = vlib_get_main ();
1219 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1221 b = vlib_get_buffer (vm, bi);
1222 tcp_init_buffer (vm, b);
1224 /* Fill in the ACK */
1225 tcp_make_ack (tc, b);
1226 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1230 * Delayed ack timer handler
1232 * Sends delayed ACK when timer expires
1235 tcp_timer_delack_handler (u32 index)
1237 u32 thread_index = vlib_get_thread_index ();
1238 tcp_connection_t *tc;
1240 tc = tcp_connection_get (index, thread_index);
1241 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1246 * Build a retransmit segment
1248 * @return the number of bytes in the segment or 0 if there's nothing to
1252 tcp_prepare_retransmit_segment (tcp_connection_t * tc, u32 offset,
1253 u32 max_deq_bytes, vlib_buffer_t ** b)
1255 tcp_main_t *tm = vnet_get_tcp_main ();
1256 vlib_main_t *vm = vlib_get_main ();
1258 u32 start, bi, available_bytes, seg_size;
1261 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1262 ASSERT (max_deq_bytes != 0);
1265 * Make sure we can retransmit something
1267 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1268 ASSERT (available_bytes >= offset);
1269 available_bytes -= offset;
1270 if (!available_bytes)
1272 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1273 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1275 /* Start is beyond snd_congestion */
1276 start = tc->snd_una + offset;
1277 if (seq_geq (start, tc->snd_congestion))
1280 /* Don't overshoot snd_congestion */
1281 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1283 max_deq_bytes = tc->snd_congestion - start;
1284 if (max_deq_bytes == 0)
1288 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1293 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1296 * Allocate and fill in buffer(s)
1299 /* Easy case, buffer size greater than mss */
1300 if (PREDICT_TRUE (seg_size <= tm->bytes_per_buffer))
1302 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1304 *b = vlib_get_buffer (vm, bi);
1305 data = tcp_init_buffer (vm, *b);
1306 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1308 ASSERT (n_bytes == max_deq_bytes);
1309 b[0]->current_length = n_bytes;
1310 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1311 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1312 tc->snd_una_max = tc->snd_nxt;
1314 /* Split mss into multiple buffers */
1317 u32 chain_bi = ~0, n_bufs_per_seg;
1318 u32 thread_index = vlib_get_thread_index ();
1319 u16 n_peeked, len_to_deq, available_bufs;
1320 vlib_buffer_t *chain_b, *prev_b;
1323 /* Make sure we have enough buffers */
1324 n_bufs_per_seg = ceil ((double) seg_size / tm->bytes_per_buffer);
1325 available_bufs = vec_len (tm->wrk_ctx[thread_index].tx_buffers);
1326 if (n_bufs_per_seg > available_bufs)
1328 tcp_alloc_tx_buffers (tm, thread_index, &available_bufs,
1331 if (n_bufs_per_seg > available_bufs)
1338 tcp_get_free_buffer_index (tm, &bi);
1339 ASSERT (bi != (u32) ~ 0);
1340 *b = vlib_get_buffer (vm, bi);
1341 data = tcp_init_buffer (vm, *b);
1342 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1343 tm->bytes_per_buffer -
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, tm->bytes_per_buffer);
1355 tcp_get_free_buffer_index (tm, &chain_bi);
1356 ASSERT (chain_bi != (u32) ~ 0);
1357 chain_b = vlib_get_buffer (vm, chain_bi);
1358 chain_b->current_data = 0;
1359 data = vlib_buffer_get_current (chain_b);
1360 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1361 offset + n_bytes, len_to_deq);
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->state, /* compute opts */ 0, /* burst */ 0);
1376 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1377 tc->snd_una_max = tc->snd_nxt;
1380 ASSERT (n_bytes > 0);
1381 ASSERT (((*b)->current_data + (*b)->current_length) <=
1382 tm->bytes_per_buffer);
1384 if (tcp_in_fastrecovery (tc))
1385 tc->snd_rxt_bytes += n_bytes;
1388 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1393 * Reset congestion control, switch cwnd to loss window and try again.
1396 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1398 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1399 tc->prev_ssthresh = tc->ssthresh;
1400 tc->prev_cwnd = tc->cwnd;
1402 /* Cleanly recover cc (also clears up fast retransmit) */
1403 if (tcp_in_fastrecovery (tc))
1404 tcp_cc_fastrecovery_exit (tc);
1406 /* Start again from the beginning */
1407 tc->cc_algo->congestion (tc);
1408 tc->cwnd = tcp_loss_wnd (tc);
1409 tc->snd_congestion = tc->snd_una_max;
1411 tc->cwnd_acc_bytes = 0;
1413 tcp_recovery_on (tc);
1417 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1419 tcp_main_t *tm = vnet_get_tcp_main ();
1420 vlib_main_t *vm = vlib_get_main ();
1421 u32 thread_index = vlib_get_thread_index ();
1422 tcp_connection_t *tc;
1423 vlib_buffer_t *b = 0;
1428 tc = tcp_half_open_connection_get (index);
1429 /* Note: the connection may have transitioned to ESTABLISHED... */
1430 if (PREDICT_FALSE (tc == 0))
1432 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1436 tc = tcp_connection_get (index, thread_index);
1437 /* Note: the connection may have been closed and pool_put */
1438 if (PREDICT_FALSE (tc == 0))
1440 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1443 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1445 if (tc->state >= TCP_STATE_ESTABLISHED)
1447 /* Lost FIN, retransmit and return */
1448 if (tcp_is_lost_fin (tc))
1452 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1456 /* Shouldn't be here. This condition is tricky because it has to take
1457 * into account boff > 0 due to persist timeout. */
1458 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1459 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1460 && !tcp_flight_size (tc)))
1462 ASSERT (!tcp_in_recovery (tc));
1467 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1468 * to persist timer timeout */
1469 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1472 tcp_update_rto (tc);
1475 /* Increment RTO backoff (also equal to number of retries) and go back
1476 * to first un-acked byte */
1479 /* First retransmit timeout */
1480 if (tc->rto_boff == 1)
1481 tcp_rxt_timeout_cc (tc);
1483 /* If we've sent beyond snd_congestion, update it */
1484 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1485 tc->snd_congestion = tc->snd_una_max;
1487 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1488 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1490 /* Send one segment. Note that n_bytes may be zero due to buffer
1492 n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
1494 /* TODO be less aggressive about this */
1495 scoreboard_clear (&tc->sack_sb);
1499 tcp_retransmit_timer_force_update (tc);
1503 bi = vlib_get_buffer_index (vm, b);
1505 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1506 if (tc->rto_boff == 1)
1507 tc->snd_rxt_ts = tcp_time_now ();
1509 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1510 tcp_retransmit_timer_force_update (tc);
1512 /* Retransmit for SYN */
1513 else if (tc->state == TCP_STATE_SYN_SENT)
1515 /* Half-open connection actually moved to established but we were
1516 * waiting for syn retransmit to pop to call cleanup from the right
1518 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1520 if (tcp_half_open_connection_cleanup (tc))
1522 clib_warning ("could not remove half-open connection");
1528 /* Try without increasing RTO a number of times. If this fails,
1529 * start growing RTO exponentially */
1531 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1532 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1534 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1535 tc->rto * TCP_TO_TIMER_TICK);
1537 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1540 b = vlib_get_buffer (vm, bi);
1541 tcp_init_buffer (vm, b);
1542 tcp_make_syn (tc, b);
1545 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1547 /* This goes straight to ipx_lookup. Retransmit timer set already */
1548 tcp_push_ip_hdr (tm, tc, b);
1549 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4, tc->c_fib_index);
1551 /* Retransmit SYN-ACK */
1552 else if (tc->state == TCP_STATE_SYN_RCVD)
1555 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1556 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1559 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1561 tcp_retransmit_timer_force_update (tc);
1565 b = vlib_get_buffer (vm, bi);
1566 tcp_init_buffer (vm, b);
1567 tcp_make_synack (tc, b);
1568 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1570 /* Retransmit timer already updated, just enqueue to output */
1571 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1575 ASSERT (tc->state == TCP_STATE_CLOSED);
1581 tcp_timer_retransmit_handler (u32 index)
1583 tcp_timer_retransmit_handler_i (index, 0);
1587 tcp_timer_retransmit_syn_handler (u32 index)
1589 tcp_timer_retransmit_handler_i (index, 1);
1593 * Got 0 snd_wnd from peer, try to do something about it.
1597 tcp_timer_persist_handler (u32 index)
1599 tcp_main_t *tm = vnet_get_tcp_main ();
1600 vlib_main_t *vm = vlib_get_main ();
1601 u32 thread_index = vlib_get_thread_index ();
1602 tcp_connection_t *tc;
1604 u32 bi, max_snd_bytes, available_bytes, offset;
1608 tc = tcp_connection_get_if_valid (index, thread_index);
1613 /* Make sure timer handle is set to invalid */
1614 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1616 /* Problem already solved or worse */
1617 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1618 || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1621 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1622 offset = tc->snd_una_max - tc->snd_una;
1624 /* Reprogram persist if no new bytes available to send. We may have data
1626 if (!available_bytes)
1628 tcp_persist_timer_set (tc);
1632 if (available_bytes <= offset)
1634 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1638 /* Increment RTO backoff */
1640 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1643 * Try to force the first unsent segment (or buffer)
1645 if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
1647 tcp_persist_timer_set (tc);
1650 b = vlib_get_buffer (vm, bi);
1651 data = tcp_init_buffer (vm, b);
1653 tcp_validate_txf_size (tc, offset);
1654 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1655 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1656 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1658 b->current_length = n_bytes;
1659 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1660 || tc->snd_nxt == tc->snd_una_max
1661 || tc->rto_boff > 1));
1663 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1664 tc->snd_una_max = tc->snd_nxt;
1665 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1666 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1668 /* Just sent new data, enable retransmit */
1669 tcp_retransmit_timer_update (tc);
1673 * Retransmit first unacked segment
1676 tcp_retransmit_first_unacked (tcp_connection_t * tc)
1678 vlib_main_t *vm = vlib_get_main ();
1680 u32 bi, old_snd_nxt, n_bytes;
1682 old_snd_nxt = tc->snd_nxt;
1683 tc->snd_nxt = tc->snd_una;
1685 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1686 n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
1689 bi = vlib_get_buffer_index (vm, b);
1690 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1692 tc->snd_nxt = old_snd_nxt;
1696 * Do fast retransmit with SACKs
1699 tcp_fast_retransmit_sack (tcp_connection_t * tc)
1701 vlib_main_t *vm = vlib_get_main ();
1702 u32 n_written = 0, offset, max_bytes, n_segs = 0;
1703 vlib_buffer_t *b = 0;
1704 sack_scoreboard_hole_t *hole;
1705 sack_scoreboard_t *sb;
1706 u32 bi, old_snd_nxt;
1708 u8 snd_limited = 0, can_rescue = 0;
1710 ASSERT (tcp_in_fastrecovery (tc));
1712 old_snd_nxt = tc->snd_nxt;
1714 snd_space = tcp_available_cc_snd_space (tc);
1716 if (snd_space < tc->snd_mss)
1719 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1720 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1721 while (hole && snd_space > 0 && n_segs++ < VLIB_FRAME_SIZE)
1723 hole = scoreboard_next_rxt_hole (sb, hole,
1724 tcp_fastrecovery_sent_1_smss (tc),
1725 &can_rescue, &snd_limited);
1728 if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
1729 || seq_gt (sb->rescue_rxt,
1730 tc->snd_congestion)))
1733 /* If rescue rxt undefined or less than snd_una then one segment of
1734 * up to SMSS octets that MUST include the highest outstanding
1735 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1736 * RecoveryPoint. HighRxt MUST NOT be updated.
1738 max_bytes = clib_min (tc->snd_mss,
1739 tc->snd_congestion - tc->snd_una);
1740 max_bytes = clib_min (max_bytes, snd_space);
1741 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1742 sb->rescue_rxt = tc->snd_congestion;
1743 tc->snd_nxt = tc->snd_una + offset;
1744 n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes,
1749 bi = vlib_get_buffer_index (vm, b);
1750 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1754 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1755 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1758 offset = sb->high_rxt - tc->snd_una;
1759 tc->snd_nxt = sb->high_rxt;
1760 n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes, &b);
1762 /* Nothing left to retransmit */
1766 bi = vlib_get_buffer_index (vm, b);
1767 sb->high_rxt += n_written;
1768 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1769 ASSERT (n_written <= snd_space);
1770 snd_space -= n_written;
1774 /* If window allows, send 1 SMSS of new data */
1775 tc->snd_nxt = old_snd_nxt;
1779 * Fast retransmit without SACK info
1782 tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
1784 vlib_main_t *vm = vlib_get_main ();
1785 u32 n_written = 0, offset = 0, bi, old_snd_nxt;
1789 ASSERT (tcp_in_fastrecovery (tc));
1790 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1792 /* Start resending from first un-acked segment */
1793 old_snd_nxt = tc->snd_nxt;
1794 tc->snd_nxt = tc->snd_una;
1795 snd_space = tcp_available_cc_snd_space (tc);
1797 while (snd_space > 0)
1799 offset += n_written;
1800 n_written = tcp_prepare_retransmit_segment (tc, offset, snd_space, &b);
1802 /* Nothing left to retransmit */
1806 bi = vlib_get_buffer_index (vm, b);
1807 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1808 snd_space -= n_written;
1811 /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
1812 tc->snd_nxt = old_snd_nxt;
1816 * Do fast retransmit
1819 tcp_fast_retransmit (tcp_connection_t * tc)
1821 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1822 tcp_fast_retransmit_sack (tc);
1824 tcp_fast_retransmit_no_sack (tc);
1828 tcp_session_has_ooo_data (tcp_connection_t * tc)
1830 stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index);
1831 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1835 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1836 u16 * next0, u32 * error0)
1838 ip_adjacency_t *adj;
1841 /* Not thread safe but as long as the connection exists the adj should
1843 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1845 if (ai == ADJ_INDEX_INVALID)
1847 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1848 *next0 = TCP_OUTPUT_NEXT_DROP;
1849 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1854 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1855 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1856 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1857 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1860 *next0 = TCP_OUTPUT_NEXT_DROP;
1861 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1863 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
1867 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1868 u32 * to_next, u32 n_bufs)
1870 u32 n_trace = vlib_get_trace_count (vm, node);
1871 tcp_connection_t *tc;
1877 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
1879 b = vlib_get_buffer (vm, to_next[i]);
1880 th = vlib_buffer_get_current (b);
1881 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
1883 t = vlib_add_trace (vm, node, b, sizeof (*t));
1884 clib_memcpy (&t->tcp_header, th, sizeof (t->tcp_header));
1885 clib_memcpy (&t->tcp_connection, tc, sizeof (t->tcp_connection));
1890 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
1891 tcp_connection_t * tc0, u8 is_ip4)
1893 tcp_header_t *th0 = 0;
1895 th0 = vlib_buffer_get_current (b0);
1896 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1899 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
1900 IP_PROTOCOL_TCP, 1);
1901 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1902 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1908 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1909 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1910 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1911 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
1912 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1918 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
1919 u32 * error0, u16 * next0, u8 is_ip4)
1922 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
1924 *error0 = TCP_ERROR_INVALID_CONNECTION;
1925 *next0 = TCP_OUTPUT_NEXT_DROP;
1929 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
1930 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1934 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
1935 tcp_output_handle_link_local (tc0, b0, next0, error0);
1938 /* Filter out DUPACKs if there are no OOO segments left */
1939 if (PREDICT_FALSE (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1941 /* N.B. Should not filter burst of dupacks. Two issues:
1942 * 1) dupacks open cwnd on remote peer when congested
1943 * 2) acks leaving should have the latest rcv_wnd since the
1944 * burst may have eaten up all of it, so only the old ones
1945 * could be filtered.
1947 if (!tcp_session_has_ooo_data (tc0))
1949 *error0 = TCP_ERROR_FILTERED_DUPACKS;
1950 *next0 = TCP_OUTPUT_NEXT_DROP;
1955 /* Stop DELACK timer and fix flags */
1956 tc0->flags &= ~(TCP_CONN_SNDACK);
1957 if (!TCP_ALWAYS_ACK)
1958 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
1962 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1963 vlib_frame_t * frame, int is_ip4)
1965 u32 n_left_from, *from, thread_index = vm->thread_index;
1966 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1967 u16 nexts[VLIB_FRAME_SIZE], *next;
1969 from = vlib_frame_vector_args (frame);
1970 n_left_from = frame->n_vectors;
1971 tcp_set_time_now (thread_index);
1973 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
1974 tcp46_output_trace_frame (vm, node, from, n_left_from);
1976 vlib_get_buffers (vm, from, bufs, n_left_from);
1980 while (n_left_from >= 4)
1982 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
1983 tcp_connection_t *tc0, *tc1;
1986 vlib_prefetch_buffer_header (b[2], STORE);
1987 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
1989 vlib_prefetch_buffer_header (b[3], STORE);
1990 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
1993 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
1995 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
1997 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2000 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2001 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2003 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2004 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2010 while (n_left_from > 0)
2012 u32 error0 = TCP_ERROR_PKTS_SENT;
2013 tcp_connection_t *tc0;
2015 if (n_left_from > 1)
2017 vlib_prefetch_buffer_header (b[1], STORE);
2018 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2021 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2022 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2025 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2026 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2033 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2034 return frame->n_vectors;
2038 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2039 vlib_frame_t * from_frame)
2041 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2045 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2046 vlib_frame_t * from_frame)
2048 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2052 VLIB_REGISTER_NODE (tcp4_output_node) =
2054 .function = tcp4_output,.name = "tcp4-output",
2055 /* Takes a vector of packets. */
2056 .vector_size = sizeof (u32),
2057 .n_errors = TCP_N_ERROR,
2058 .error_strings = tcp_error_strings,
2059 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2061 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2062 foreach_tcp4_output_next
2065 .format_buffer = format_tcp_header,
2066 .format_trace = format_tcp_tx_trace,
2070 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2073 VLIB_REGISTER_NODE (tcp6_output_node) =
2075 .function = tcp6_output,
2076 .name = "tcp6-output",
2077 /* Takes a vector of packets. */
2078 .vector_size = sizeof (u32),
2079 .n_errors = TCP_N_ERROR,
2080 .error_strings = tcp_error_strings,
2081 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2083 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2084 foreach_tcp6_output_next
2087 .format_buffer = format_tcp_header,
2088 .format_trace = format_tcp_tx_trace,
2092 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2094 typedef enum _tcp_reset_next
2096 TCP_RESET_NEXT_DROP,
2097 TCP_RESET_NEXT_IP_LOOKUP,
2101 #define foreach_tcp4_reset_next \
2102 _(DROP, "error-drop") \
2103 _(IP_LOOKUP, "ip4-lookup")
2105 #define foreach_tcp6_reset_next \
2106 _(DROP, "error-drop") \
2107 _(IP_LOOKUP, "ip6-lookup")
2110 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2111 vlib_frame_t * from_frame, u8 is_ip4)
2113 u32 n_left_from, next_index, *from, *to_next;
2114 u32 my_thread_index = vm->thread_index;
2116 from = vlib_frame_vector_args (from_frame);
2117 n_left_from = from_frame->n_vectors;
2119 next_index = node->cached_next_index;
2121 while (n_left_from > 0)
2125 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2127 while (n_left_from > 0 && n_left_to_next > 0)
2133 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2140 n_left_to_next -= 1;
2142 b0 = vlib_get_buffer (vm, bi0);
2144 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2145 my_thread_index, is_ip4))
2147 error0 = TCP_ERROR_LOOKUP_DROPS;
2148 next0 = TCP_RESET_NEXT_DROP;
2152 /* Prepare to send to IP lookup */
2153 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2154 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2157 b0->error = node->errors[error0];
2158 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2159 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2161 th0 = vlib_buffer_get_current (b0);
2163 th0 = ip4_next_header ((ip4_header_t *) th0);
2165 th0 = ip6_next_header ((ip6_header_t *) th0);
2166 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2167 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
2170 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2171 n_left_to_next, bi0, next0);
2173 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2175 return from_frame->n_vectors;
2179 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2180 vlib_frame_t * from_frame)
2182 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2186 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2187 vlib_frame_t * from_frame)
2189 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2193 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2194 .function = tcp4_send_reset,
2195 .name = "tcp4-reset",
2196 .vector_size = sizeof (u32),
2197 .n_errors = TCP_N_ERROR,
2198 .error_strings = tcp_error_strings,
2199 .n_next_nodes = TCP_RESET_N_NEXT,
2201 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2202 foreach_tcp4_reset_next
2205 .format_trace = format_tcp_tx_trace,
2209 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2212 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2213 .function = tcp6_send_reset,
2214 .name = "tcp6-reset",
2215 .vector_size = sizeof (u32),
2216 .n_errors = TCP_N_ERROR,
2217 .error_strings = tcp_error_strings,
2218 .n_next_nodes = TCP_RESET_N_NEXT,
2220 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2221 foreach_tcp6_reset_next
2224 .format_trace = format_tcp_tx_trace,
2228 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2231 * fd.io coding-style-patch-verification: ON
2234 * eval: (c-set-style "gnu")