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_w_thread (tc->c_thread_index);
365 opts->tsecr = tc->tsval_recent;
366 len += TCP_OPTION_LEN_TIMESTAMP;
368 if (tcp_opts_sack_permitted (&tc->rcv_opts))
370 if (vec_len (tc->snd_sacks))
372 opts->flags |= TCP_OPTS_FLAG_SACK;
373 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_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted)
464 vlib_main_t *vm = vlib_get_main ();
467 ASSERT (wanted > *n_bufs);
468 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
469 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
472 _vec_len (wrk->tx_buffers) = *n_bufs;
477 tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx)
479 u16 n_bufs = vec_len (wrk->tx_buffers);
481 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index);
483 if (PREDICT_FALSE (!n_bufs))
485 if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE))
491 *bidx = wrk->tx_buffers[--n_bufs];
492 _vec_len (wrk->tx_buffers) = n_bufs;
497 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
499 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
500 vlib_buffer_free_one (vm, b->next_buffer);
501 /* Zero all flags but free list index and trace flag */
502 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
504 b->current_length = 0;
505 b->total_length_not_including_first_buffer = 0;
506 vnet_buffer (b)->tcp.flags = 0;
508 /* Leave enough space for headers */
509 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
513 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
515 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
516 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
517 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
518 b->total_length_not_including_first_buffer = 0;
520 vnet_buffer (b)->tcp.flags = 0;
521 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
522 /* Leave enough space for headers */
523 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
530 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
533 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
534 u8 tcp_opts_len, tcp_hdr_opts_len;
538 wnd = tcp_window_to_advertise (tc, state);
540 /* Make and write options */
541 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
542 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
544 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
545 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
547 tcp_options_write ((u8 *) (th + 1), snd_opts);
548 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
552 * Convert buffer to ACK
555 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
557 vlib_main_t *vm = vlib_get_main ();
559 tcp_reuse_buffer (vm, b);
560 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
561 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
562 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
563 tc->rcv_las = tc->rcv_nxt;
567 * Convert buffer to FIN-ACK
570 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
572 vlib_main_t *vm = vlib_get_main ();
575 tcp_reuse_buffer (vm, b);
577 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
578 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
580 /* Reset flags, make sure ack is sent */
581 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
585 * Convert buffer to SYN
588 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
590 u8 tcp_hdr_opts_len, tcp_opts_len;
593 tcp_options_t snd_opts;
595 initial_wnd = tcp_initial_window_to_advertise (tc);
597 /* Make and write options */
598 clib_memset (&snd_opts, 0, sizeof (snd_opts));
599 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
600 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
602 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
603 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
605 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
606 tcp_options_write ((u8 *) (th + 1), &snd_opts);
610 * Convert buffer to SYN-ACK
613 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
615 vlib_main_t *vm = vlib_get_main ();
616 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
617 u8 tcp_opts_len, tcp_hdr_opts_len;
621 clib_memset (snd_opts, 0, sizeof (*snd_opts));
622 tcp_reuse_buffer (vm, b);
624 initial_wnd = tcp_initial_window_to_advertise (tc);
625 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
626 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
628 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
629 tc->rcv_nxt, tcp_hdr_opts_len,
630 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
631 tcp_options_write ((u8 *) (th + 1), snd_opts);
633 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
634 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
636 /* Init retransmit timer. Use update instead of set because of
638 tcp_retransmit_timer_force_update (tc);
639 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
643 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
644 u8 is_ip4, u32 fib_index, u8 flush)
646 vlib_main_t *vm = wrk->vm;
647 u32 *to_next, next_index;
650 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
653 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
654 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
656 /* Send to IP lookup */
657 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
658 tcp_trajectory_add_start (b, 1);
660 f = wrk->ip_lookup_tx_frames[!is_ip4];
663 f = vlib_get_frame_to_node (vm, next_index);
665 wrk->ip_lookup_tx_frames[!is_ip4] = f;
668 to_next = vlib_frame_vector_args (f);
669 to_next[f->n_vectors] = bi;
671 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
673 vlib_put_frame_to_node (vm, next_index, f);
674 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
679 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
680 u32 bi, u8 is_ip4, u32 fib_index)
682 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
686 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
687 u8 is_ip4, u32 fib_index)
689 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
690 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
691 session_flush_frames_main_thread (wrk->vm);
695 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
698 u32 *to_next, next_index;
701 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
704 /* Decide where to send the packet */
705 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
706 tcp_trajectory_add_start (b, 2);
708 /* Get frame to v4/6 output node */
709 f = wrk->tx_frames[!is_ip4];
712 f = vlib_get_frame_to_node (wrk->vm, next_index);
714 wrk->tx_frames[!is_ip4] = f;
716 to_next = vlib_frame_vector_args (f);
717 to_next[f->n_vectors] = bi;
719 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
721 vlib_put_frame_to_node (wrk->vm, next_index, f);
722 wrk->tx_frames[!is_ip4] = 0;
727 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
730 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
734 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
737 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
741 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
742 tcp_state_t state, u8 thread_index, u8 is_ip4)
747 ip4_address_t src_ip40, dst_ip40;
748 ip6_address_t src_ip60, dst_ip60;
749 u16 src_port, dst_port;
754 /* Find IP and TCP headers */
755 th0 = tcp_buffer_hdr (b0);
757 /* Save src and dst ip */
760 ih4 = vlib_buffer_get_current (b0);
761 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
762 src_ip40.as_u32 = ih4->src_address.as_u32;
763 dst_ip40.as_u32 = ih4->dst_address.as_u32;
767 ih6 = vlib_buffer_get_current (b0);
768 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
769 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
770 clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
773 src_port = th0->src_port;
774 dst_port = th0->dst_port;
776 /* Try to determine what/why we're actually resetting */
777 if (state == TCP_STATE_CLOSED)
782 tmp = clib_net_to_host_u32 (th0->seq_number);
784 /* Got a SYN for no listener. */
785 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
786 ack = clib_host_to_net_u32 (tmp + 1);
791 flags = TCP_FLAG_RST;
792 seq = th0->ack_number;
796 tcp_reuse_buffer (vm, b0);
797 tcp_trajectory_add_start (b0, 4);
798 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
799 sizeof (tcp_header_t), flags, 0);
803 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
805 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
810 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
812 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
820 * Send reset without reusing existing buffer
822 * It extracts connection info out of original packet
825 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
827 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
828 vlib_main_t *vm = wrk->vm;
830 u32 bi, sw_if_index, fib_index;
831 u8 tcp_hdr_len, flags = 0;
832 tcp_header_t *th, *pkt_th;
834 ip4_header_t *ih4, *pkt_ih4;
835 ip6_header_t *ih6, *pkt_ih6;
836 fib_protocol_t fib_proto;
838 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
841 b = vlib_get_buffer (vm, bi);
842 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
843 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
844 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
845 tcp_init_buffer (vm, b);
847 /* Make and write options */
848 tcp_hdr_len = sizeof (tcp_header_t);
852 pkt_ih4 = vlib_buffer_get_current (pkt);
853 pkt_th = ip4_next_header (pkt_ih4);
857 pkt_ih6 = vlib_buffer_get_current (pkt);
858 pkt_th = ip6_next_header (pkt_ih6);
861 if (tcp_ack (pkt_th))
863 flags = TCP_FLAG_RST;
864 seq = pkt_th->ack_number;
865 ack = (tc && tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
869 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
871 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
874 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
875 seq, ack, tcp_hdr_len, flags, 0);
877 /* Swap src and dst ip */
880 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
881 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
882 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
883 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
888 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
890 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
891 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
892 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
896 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
897 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
901 * Build and set reset packet for connection
904 tcp_send_reset (tcp_connection_t * tc)
906 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
907 vlib_main_t *vm = wrk->vm;
911 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
914 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
916 b = vlib_get_buffer (vm, bi);
917 tcp_init_buffer (vm, b);
919 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
920 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
921 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
922 flags = TCP_FLAG_RST;
923 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
924 tc->rcv_nxt, tcp_hdr_opts_len, flags,
926 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
927 ASSERT (opts_write_len == tc->snd_opts_len);
928 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
932 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
933 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
934 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
940 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
941 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
942 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
945 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
946 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
950 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
953 tcp_header_t *th = vlib_buffer_get_current (b);
954 vlib_main_t *vm = wrk->vm;
958 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
959 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
960 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
967 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
968 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
969 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
977 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
978 * The packet is not forwarded through tcpx_output to avoid doing lookups
979 * in the half_open pool.
982 tcp_send_syn (tcp_connection_t * tc)
984 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
985 vlib_main_t *vm = wrk->vm;
990 * Setup retransmit and establish timers before requesting buffer
991 * such that we can return if we've ran out.
993 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
994 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
995 tc->rto * TCP_TO_TIMER_TICK);
997 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1000 b = vlib_get_buffer (vm, bi);
1001 tcp_init_buffer (vm, b);
1002 tcp_make_syn (tc, b);
1004 /* Measure RTT with this */
1005 tc->rtt_ts = tcp_time_now ();
1006 tc->rtt_seq = tc->snd_nxt;
1009 tcp_push_ip_hdr (wrk, tc, b);
1010 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1011 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1015 * Flush tx frame populated by retransmits and timer pops
1018 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1020 if (wrk->tx_frames[!is_ip4])
1023 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1024 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1025 wrk->tx_frames[!is_ip4] = 0;
1030 * Flush ip lookup tx frames populated by timer pops
1033 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1035 if (wrk->ip_lookup_tx_frames[!is_ip4])
1038 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1039 vlib_put_frame_to_node (wrk->vm, next_index,
1040 wrk->ip_lookup_tx_frames[!is_ip4]);
1041 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1046 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1049 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1051 tcp_flush_frame_to_output (wrk, 1);
1052 tcp_flush_frame_to_output (wrk, 0);
1053 tcp_flush_frame_to_ip_lookup (wrk, 1);
1054 tcp_flush_frame_to_ip_lookup (wrk, 0);
1061 tcp_send_fin (tcp_connection_t * tc)
1063 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1064 vlib_main_t *vm = wrk->vm;
1069 fin_snt = tc->flags & TCP_CONN_FINSNT;
1071 tc->snd_nxt = tc->snd_una;
1073 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1075 /* Out of buffers so program fin retransmit ASAP */
1076 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1080 tcp_retransmit_timer_force_update (tc);
1081 b = vlib_get_buffer (vm, bi);
1082 tcp_init_buffer (vm, b);
1083 tcp_make_fin (tc, b);
1084 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1085 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
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;
1103 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1107 case TCP_STATE_ESTABLISHED:
1108 case TCP_STATE_CLOSE_WAIT:
1109 return TCP_FLAG_ACK;
1110 case TCP_STATE_SYN_RCVD:
1111 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1112 case TCP_STATE_SYN_SENT:
1113 return TCP_FLAG_SYN;
1114 case TCP_STATE_LAST_ACK:
1115 case TCP_STATE_FIN_WAIT_1:
1116 if (tc->snd_nxt + 1 < tc->snd_una_max)
1117 return TCP_FLAG_ACK;
1119 return TCP_FLAG_FIN;
1121 clib_warning ("Shouldn't be here!");
1127 * Push TCP header and update connection variables
1130 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1131 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1133 u32 advertise_wnd, data_len;
1134 u8 tcp_hdr_opts_len, flags;
1135 tcp_main_t *tm = &tcp_main;
1138 data_len = b->current_length;
1139 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1140 data_len += b->total_length_not_including_first_buffer;
1142 vnet_buffer (b)->tcp.flags = 0;
1143 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1146 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1148 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1151 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1153 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1155 flags = tcp_make_state_flags (tc, next_state);
1157 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1158 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1163 clib_memcpy ((u8 *) (th + 1),
1164 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1169 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1170 ASSERT (len == tc->snd_opts_len);
1174 * Update connection variables
1177 tc->snd_nxt += data_len;
1178 tc->rcv_las = tc->rcv_nxt;
1180 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1184 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1186 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1188 tc->snd_una_max = tc->snd_nxt;
1189 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd
1190 + tcp_fastrecovery_sent_1_smss (tc) * tc->snd_mss));
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_us (tc->c_thread_index);
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_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1211 vlib_main_t *vm = wrk->vm;
1216 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1218 b = vlib_get_buffer (vm, bi);
1219 tcp_init_buffer (vm, b);
1221 /* Fill in the ACK */
1222 tcp_make_ack (tc, b);
1223 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1227 * Delayed ack timer handler
1229 * Sends delayed ACK when timer expires
1232 tcp_timer_delack_handler (u32 index)
1234 u32 thread_index = vlib_get_thread_index ();
1235 tcp_connection_t *tc;
1237 tc = tcp_connection_get (index, thread_index);
1238 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1243 * Build a retransmit segment
1245 * @return the number of bytes in the segment or 0 if there's nothing to
1249 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1250 tcp_connection_t * tc, u32 offset,
1251 u32 max_deq_bytes, vlib_buffer_t ** b)
1253 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1254 vlib_main_t *vm = wrk->vm;
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 <= bytes_per_buffer))
1300 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &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);
1309 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1310 tc->snd_una_max = tc->snd_nxt;
1312 /* Split mss into multiple buffers */
1315 u32 chain_bi = ~0, n_bufs_per_seg;
1316 u16 n_peeked, len_to_deq, available_bufs;
1317 vlib_buffer_t *chain_b, *prev_b;
1320 /* Make sure we have enough buffers */
1321 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1322 available_bufs = vec_len (wrk->tx_buffers);
1323 if (n_bufs_per_seg > available_bufs)
1325 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1326 if (n_bufs_per_seg > available_bufs)
1333 tcp_get_free_buffer_index (wrk, &bi);
1334 ASSERT (bi != (u32) ~ 0);
1335 *b = vlib_get_buffer (vm, bi);
1336 data = tcp_init_buffer (vm, *b);
1337 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1338 bytes_per_buffer - MAX_HDRS_LEN);
1339 b[0]->current_length = n_bytes;
1340 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1341 b[0]->total_length_not_including_first_buffer = 0;
1342 max_deq_bytes -= n_bytes;
1345 for (i = 1; i < n_bufs_per_seg; i++)
1348 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1349 tcp_get_free_buffer_index (wrk, &chain_bi);
1350 ASSERT (chain_bi != (u32) ~ 0);
1351 chain_b = vlib_get_buffer (vm, chain_bi);
1352 chain_b->current_data = 0;
1353 data = vlib_buffer_get_current (chain_b);
1354 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1355 offset + n_bytes, len_to_deq);
1356 ASSERT (n_peeked == len_to_deq);
1357 n_bytes += n_peeked;
1358 chain_b->current_length = n_peeked;
1359 chain_b->next_buffer = 0;
1361 /* update previous buffer */
1362 prev_b->next_buffer = chain_bi;
1363 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1365 max_deq_bytes -= n_peeked;
1366 b[0]->total_length_not_including_first_buffer += n_peeked;
1369 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1370 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1371 tc->snd_una_max = tc->snd_nxt;
1374 ASSERT (n_bytes > 0);
1375 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1377 if (tcp_in_fastrecovery (tc))
1378 tc->snd_rxt_bytes += n_bytes;
1381 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1386 * Reset congestion control, switch cwnd to loss window and try again.
1389 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1391 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1392 tc->prev_ssthresh = tc->ssthresh;
1393 tc->prev_cwnd = tc->cwnd;
1395 /* Cleanly recover cc (also clears up fast retransmit) */
1396 if (tcp_in_fastrecovery (tc))
1398 /* TODO be less aggressive about this */
1399 scoreboard_clear (&tc->sack_sb);
1400 tcp_cc_fastrecovery_exit (tc);
1403 /* Start again from the beginning */
1404 tc->cc_algo->congestion (tc);
1405 tc->cwnd = tcp_loss_wnd (tc);
1406 tc->snd_congestion = tc->snd_una_max;
1408 tc->cwnd_acc_bytes = 0;
1410 tcp_recovery_on (tc);
1414 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1416 u32 thread_index = vlib_get_thread_index ();
1417 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1418 vlib_main_t *vm = wrk->vm;
1419 tcp_connection_t *tc;
1420 vlib_buffer_t *b = 0;
1425 tc = tcp_half_open_connection_get (index);
1426 /* Note: the connection may have transitioned to ESTABLISHED... */
1427 if (PREDICT_FALSE (tc == 0))
1429 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1433 tc = tcp_connection_get (index, thread_index);
1434 /* Note: the connection may have been closed and pool_put */
1435 if (PREDICT_FALSE (tc == 0))
1437 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1440 if (tc->state >= TCP_STATE_ESTABLISHED)
1442 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1444 /* Lost FIN, retransmit and return */
1445 if (tcp_is_lost_fin (tc))
1449 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1453 /* Shouldn't be here. This condition is tricky because it has to take
1454 * into account boff > 0 due to persist timeout. */
1455 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1456 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1457 && !tcp_flight_size (tc)))
1459 ASSERT (!tcp_in_recovery (tc));
1464 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1465 * to persist timer timeout */
1466 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1469 tcp_update_rto (tc);
1472 /* Increment RTO backoff (also equal to number of retries) and go back
1473 * to first un-acked byte */
1476 /* First retransmit timeout */
1477 if (tc->rto_boff == 1)
1478 tcp_rxt_timeout_cc (tc);
1480 scoreboard_clear (&tc->sack_sb);
1482 /* If we've sent beyond snd_congestion, update it */
1483 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1484 tc->snd_congestion = tc->snd_una_max;
1486 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1487 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1489 /* Send one segment. Note that n_bytes may be zero due to buffer
1491 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1495 tcp_retransmit_timer_force_update (tc);
1499 bi = vlib_get_buffer_index (vm, b);
1501 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1502 if (tc->rto_boff == 1)
1503 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1505 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1506 tcp_retransmit_timer_force_update (tc);
1508 /* Retransmit for SYN */
1509 else if (tc->state == TCP_STATE_SYN_SENT)
1511 /* Half-open connection actually moved to established but we were
1512 * waiting for syn retransmit to pop to call cleanup from the right
1514 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1516 if (tcp_half_open_connection_cleanup (tc))
1518 clib_warning ("could not remove half-open connection");
1524 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1526 /* Try without increasing RTO a number of times. If this fails,
1527 * start growing RTO exponentially */
1529 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1530 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1532 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1533 tc->rto * TCP_TO_TIMER_TICK);
1535 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1538 b = vlib_get_buffer (vm, bi);
1539 tcp_init_buffer (vm, b);
1540 tcp_make_syn (tc, b);
1543 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1545 /* This goes straight to ipx_lookup. Retransmit timer set already */
1546 tcp_push_ip_hdr (wrk, tc, b);
1547 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1549 /* Retransmit SYN-ACK */
1550 else if (tc->state == TCP_STATE_SYN_RCVD)
1552 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
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 (wrk, &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 (wrk, 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 u32 thread_index = vlib_get_thread_index ();
1600 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1601 u32 bi, max_snd_bytes, available_bytes, offset;
1602 tcp_main_t *tm = vnet_get_tcp_main ();
1603 vlib_main_t *vm = wrk->vm;
1604 tcp_connection_t *tc;
1609 tc = tcp_connection_get_if_valid (index, thread_index);
1614 /* Make sure timer handle is set to invalid */
1615 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1617 /* Problem already solved or worse */
1618 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1619 || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1622 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1623 offset = tc->snd_una_max - tc->snd_una;
1625 /* Reprogram persist if no new bytes available to send. We may have data
1627 if (!available_bytes)
1629 tcp_persist_timer_set (tc);
1633 if (available_bytes <= offset)
1635 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1639 /* Increment RTO backoff */
1641 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1644 * Try to force the first unsent segment (or buffer)
1646 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1648 tcp_persist_timer_set (tc);
1651 b = vlib_get_buffer (vm, bi);
1652 data = tcp_init_buffer (vm, b);
1654 tcp_validate_txf_size (tc, offset);
1655 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1656 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1657 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1659 b->current_length = n_bytes;
1660 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1661 || tc->snd_nxt == tc->snd_una_max
1662 || tc->rto_boff > 1));
1664 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1665 tc->snd_una_max = tc->snd_nxt;
1666 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1667 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1669 /* Just sent new data, enable retransmit */
1670 tcp_retransmit_timer_update (tc);
1674 * Retransmit first unacked segment
1677 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1679 u32 bi, old_snd_nxt, n_bytes;
1680 vlib_main_t *vm = wrk->vm;
1683 old_snd_nxt = tc->snd_nxt;
1684 tc->snd_nxt = tc->snd_una;
1686 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1688 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1692 bi = vlib_get_buffer_index (vm, b);
1693 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1694 tc->snd_nxt = old_snd_nxt;
1700 * Do fast retransmit with SACKs
1703 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1706 vlib_main_t *vm = wrk->vm;
1707 u32 n_written = 0, offset, max_bytes, n_segs = 0;
1708 vlib_buffer_t *b = 0;
1709 sack_scoreboard_hole_t *hole;
1710 sack_scoreboard_t *sb;
1711 u32 bi, old_snd_nxt;
1713 u8 snd_limited = 0, can_rescue = 0;
1715 ASSERT (tcp_in_fastrecovery (tc));
1717 old_snd_nxt = tc->snd_nxt;
1719 snd_space = tcp_available_cc_snd_space (tc);
1720 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1722 if (snd_space < tc->snd_mss)
1724 tcp_program_fastretransmit (wrk, tc);
1728 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1729 while (snd_space > 0 && n_segs < burst_size)
1731 hole = scoreboard_next_rxt_hole (sb, hole,
1732 tcp_fastrecovery_sent_1_smss (tc),
1733 &can_rescue, &snd_limited);
1736 if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
1737 || seq_gt (sb->rescue_rxt,
1738 tc->snd_congestion)))
1740 if (tcp_fastrecovery_first (tc))
1743 /* We tend to lose the first segment. Try re-resending
1744 * it but only once and after we've tried everything */
1745 hole = scoreboard_first_hole (sb);
1746 if (hole && hole->start == tc->snd_una)
1748 tcp_retransmit_first_unacked (wrk, tc);
1749 tcp_fastrecovery_first_on (tc);
1755 /* If rescue rxt undefined or less than snd_una then one segment of
1756 * up to SMSS octets that MUST include the highest outstanding
1757 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1758 * RecoveryPoint. HighRxt MUST NOT be updated.
1760 max_bytes = clib_min (tc->snd_mss,
1761 tc->snd_congestion - tc->snd_una);
1762 max_bytes = clib_min (max_bytes, snd_space);
1763 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1764 sb->rescue_rxt = tc->snd_congestion;
1765 tc->snd_nxt = tc->snd_una + offset;
1766 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1771 bi = vlib_get_buffer_index (vm, b);
1772 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1777 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1778 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1781 offset = sb->high_rxt - tc->snd_una;
1782 tc->snd_nxt = sb->high_rxt;
1783 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1786 /* Nothing left to retransmit */
1790 bi = vlib_get_buffer_index (vm, b);
1791 sb->high_rxt += n_written;
1792 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1793 ASSERT (n_written <= snd_space);
1794 snd_space -= n_written;
1799 tcp_program_fastretransmit (wrk, tc);
1802 /* If window allows, send 1 SMSS of new data */
1803 tc->snd_nxt = old_snd_nxt;
1808 * Fast retransmit without SACK info
1811 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1814 u32 n_written = 0, offset = 0, bi, old_snd_nxt;
1815 vlib_main_t *vm = wrk->vm;
1816 int snd_space, n_segs = 0;
1819 ASSERT (tcp_in_fastrecovery (tc));
1820 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1822 /* Start resending from first un-acked segment */
1823 old_snd_nxt = tc->snd_nxt;
1824 tc->snd_nxt = tc->snd_una;
1825 snd_space = tcp_available_cc_snd_space (tc);
1827 while (snd_space > 0 && n_segs < burst_size)
1829 offset += n_written;
1830 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, snd_space,
1833 /* Nothing left to retransmit */
1837 bi = vlib_get_buffer_index (vm, b);
1838 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1839 snd_space -= n_written;
1843 /* More data to resend */
1844 if (seq_lt (tc->snd_nxt, tc->snd_congestion))
1845 tcp_program_fastretransmit (wrk, tc);
1847 /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
1848 tc->snd_nxt = old_snd_nxt;
1854 * Do fast retransmit
1857 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1860 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1861 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1863 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1867 tcp_session_has_ooo_data (tcp_connection_t * tc)
1869 stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index);
1870 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1874 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1875 u16 * next0, u32 * error0)
1877 ip_adjacency_t *adj;
1880 /* Not thread safe but as long as the connection exists the adj should
1882 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1884 if (ai == ADJ_INDEX_INVALID)
1886 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1887 *next0 = TCP_OUTPUT_NEXT_DROP;
1888 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1893 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1894 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1895 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1896 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1899 *next0 = TCP_OUTPUT_NEXT_DROP;
1900 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1902 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
1906 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1907 u32 * to_next, u32 n_bufs)
1909 u32 n_trace = vlib_get_trace_count (vm, node);
1910 tcp_connection_t *tc;
1916 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
1918 b = vlib_get_buffer (vm, to_next[i]);
1919 th = vlib_buffer_get_current (b);
1920 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
1922 t = vlib_add_trace (vm, node, b, sizeof (*t));
1923 clib_memcpy (&t->tcp_header, th, sizeof (t->tcp_header));
1924 clib_memcpy (&t->tcp_connection, tc, sizeof (t->tcp_connection));
1929 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
1930 tcp_connection_t * tc0, u8 is_ip4)
1932 tcp_header_t *th0 = 0;
1934 th0 = vlib_buffer_get_current (b0);
1935 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1938 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
1939 IP_PROTOCOL_TCP, 1);
1940 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1941 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1947 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1948 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1949 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
1950 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
1951 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
1957 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
1958 u32 * error0, u16 * next0, u8 is_ip4)
1961 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
1963 *error0 = TCP_ERROR_INVALID_CONNECTION;
1964 *next0 = TCP_OUTPUT_NEXT_DROP;
1968 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
1969 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1973 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
1974 tcp_output_handle_link_local (tc0, b0, next0, error0);
1977 /* Filter out DUPACKs if there are no OOO segments left */
1978 if (PREDICT_FALSE (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1980 /* N.B. Should not filter burst of dupacks. Two issues:
1981 * 1) dupacks open cwnd on remote peer when congested
1982 * 2) acks leaving should have the latest rcv_wnd since the
1983 * burst may have eaten up all of it, so only the old ones
1984 * could be filtered.
1986 if (!tcp_session_has_ooo_data (tc0))
1988 *error0 = TCP_ERROR_FILTERED_DUPACKS;
1989 *next0 = TCP_OUTPUT_NEXT_DROP;
1994 /* Stop DELACK timer and fix flags */
1995 tc0->flags &= ~(TCP_CONN_SNDACK);
1996 if (!TCP_ALWAYS_ACK)
1997 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2001 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2002 vlib_frame_t * frame, int is_ip4)
2004 u32 n_left_from, *from, thread_index = vm->thread_index;
2005 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2006 u16 nexts[VLIB_FRAME_SIZE], *next;
2008 from = vlib_frame_vector_args (frame);
2009 n_left_from = frame->n_vectors;
2010 tcp_set_time_now (tcp_get_worker (thread_index));
2012 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2013 tcp46_output_trace_frame (vm, node, from, n_left_from);
2015 vlib_get_buffers (vm, from, bufs, n_left_from);
2019 while (n_left_from >= 4)
2021 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2022 tcp_connection_t *tc0, *tc1;
2025 vlib_prefetch_buffer_header (b[2], STORE);
2026 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2028 vlib_prefetch_buffer_header (b[3], STORE);
2029 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2032 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2034 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2036 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2039 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2040 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2042 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2043 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2049 while (n_left_from > 0)
2051 u32 error0 = TCP_ERROR_PKTS_SENT;
2052 tcp_connection_t *tc0;
2054 if (n_left_from > 1)
2056 vlib_prefetch_buffer_header (b[1], STORE);
2057 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2060 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2061 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2064 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2065 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2072 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2073 return frame->n_vectors;
2077 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2078 vlib_frame_t * from_frame)
2080 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2084 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2085 vlib_frame_t * from_frame)
2087 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2091 VLIB_REGISTER_NODE (tcp4_output_node) =
2093 .function = tcp4_output,.name = "tcp4-output",
2094 /* Takes a vector of packets. */
2095 .vector_size = sizeof (u32),
2096 .n_errors = TCP_N_ERROR,
2097 .error_strings = tcp_error_strings,
2098 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2100 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2101 foreach_tcp4_output_next
2104 .format_buffer = format_tcp_header,
2105 .format_trace = format_tcp_tx_trace,
2109 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2112 VLIB_REGISTER_NODE (tcp6_output_node) =
2114 .function = tcp6_output,
2115 .name = "tcp6-output",
2116 /* Takes a vector of packets. */
2117 .vector_size = sizeof (u32),
2118 .n_errors = TCP_N_ERROR,
2119 .error_strings = tcp_error_strings,
2120 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2122 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2123 foreach_tcp6_output_next
2126 .format_buffer = format_tcp_header,
2127 .format_trace = format_tcp_tx_trace,
2131 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2133 typedef enum _tcp_reset_next
2135 TCP_RESET_NEXT_DROP,
2136 TCP_RESET_NEXT_IP_LOOKUP,
2140 #define foreach_tcp4_reset_next \
2141 _(DROP, "error-drop") \
2142 _(IP_LOOKUP, "ip4-lookup")
2144 #define foreach_tcp6_reset_next \
2145 _(DROP, "error-drop") \
2146 _(IP_LOOKUP, "ip6-lookup")
2149 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2150 vlib_frame_t * from_frame, u8 is_ip4)
2152 u32 n_left_from, next_index, *from, *to_next;
2153 u32 my_thread_index = vm->thread_index;
2155 from = vlib_frame_vector_args (from_frame);
2156 n_left_from = from_frame->n_vectors;
2158 next_index = node->cached_next_index;
2160 while (n_left_from > 0)
2164 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2166 while (n_left_from > 0 && n_left_to_next > 0)
2172 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2179 n_left_to_next -= 1;
2181 b0 = vlib_get_buffer (vm, bi0);
2183 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2184 my_thread_index, is_ip4))
2186 error0 = TCP_ERROR_LOOKUP_DROPS;
2187 next0 = TCP_RESET_NEXT_DROP;
2191 /* Prepare to send to IP lookup */
2192 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2193 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2196 b0->error = node->errors[error0];
2197 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2198 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2200 th0 = vlib_buffer_get_current (b0);
2202 th0 = ip4_next_header ((ip4_header_t *) th0);
2204 th0 = ip6_next_header ((ip6_header_t *) th0);
2205 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2206 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
2209 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2210 n_left_to_next, bi0, next0);
2212 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2214 return from_frame->n_vectors;
2218 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2219 vlib_frame_t * from_frame)
2221 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2225 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2226 vlib_frame_t * from_frame)
2228 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2232 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2233 .function = tcp4_send_reset,
2234 .name = "tcp4-reset",
2235 .vector_size = sizeof (u32),
2236 .n_errors = TCP_N_ERROR,
2237 .error_strings = tcp_error_strings,
2238 .n_next_nodes = TCP_RESET_N_NEXT,
2240 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2241 foreach_tcp4_reset_next
2244 .format_trace = format_tcp_tx_trace,
2248 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2251 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2252 .function = tcp6_send_reset,
2253 .name = "tcp6-reset",
2254 .vector_size = sizeof (u32),
2255 .n_errors = TCP_N_ERROR,
2256 .error_strings = tcp_error_strings,
2257 .n_next_nodes = TCP_RESET_N_NEXT,
2259 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2260 foreach_tcp6_reset_next
2263 .format_trace = format_tcp_tx_trace,
2267 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2270 * fd.io coding-style-patch-verification: ON
2273 * eval: (c-set-style "gnu")