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>
19 vlib_node_registration_t tcp4_output_node;
20 vlib_node_registration_t tcp6_output_node;
22 typedef enum _tcp_output_nect
25 TCP_OUTPUT_NEXT_IP_LOOKUP,
29 #define foreach_tcp4_output_next \
30 _ (DROP, "error-drop") \
31 _ (IP_LOOKUP, "ip4-lookup")
33 #define foreach_tcp6_output_next \
34 _ (DROP, "error-drop") \
35 _ (IP_LOOKUP, "ip6-lookup")
37 static char *tcp_error_strings[] = {
38 #define tcp_error(n,s) s,
39 #include <vnet/tcp/tcp_error.def>
45 tcp_header_t tcp_header;
46 tcp_connection_t tcp_connection;
52 format_tcp_tx_trace (u8 * s, va_list * args)
54 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
57 uword indent = format_get_indent (s);
59 s = format (s, "%U\n%U%U",
60 format_tcp_header, &t->tcp_header, 128,
61 format_white_space, indent,
62 format_tcp_connection_verbose, &t->tcp_connection);
68 tcp_window_compute_scale (u32 available_space)
71 while (wnd_scale < TCP_MAX_WND_SCALE
72 && (available_space >> wnd_scale) > TCP_WND_MAX)
78 * TCP's IW as recommended by RFC6928
81 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
83 return TCP_IW_N_SEGMENTS * tc->mss;
87 * Compute initial window and scale factor. As per RFC1323, window field in
88 * SYN and SYN-ACK segments is never scaled.
91 tcp_initial_window_to_advertise (tcp_connection_t * tc)
95 /* Initial wnd for SYN. Fifos are not allocated yet.
96 * Use some predefined value. For SYN-ACK we still want the
97 * scale to be computed in the same way */
98 max_fifo = TCP_MAX_RX_FIFO_SIZE;
100 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
101 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
103 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
107 * Compute and return window to advertise, scaled as per RFC1323
110 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
112 if (state < TCP_STATE_ESTABLISHED)
113 return tcp_initial_window_to_advertise (tc);
115 tcp_update_rcv_wnd (tc);
117 if (tc->rcv_wnd == 0)
119 tc->flags |= TCP_CONN_SENT_RCV_WND0;
123 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
126 return tc->rcv_wnd >> tc->rcv_wscale;
130 tcp_update_rcv_wnd (tcp_connection_t * tc)
133 u32 available_space, max_fifo, wnd;
136 * Figure out how much space we have available
138 available_space = stream_session_max_rx_enqueue (&tc->connection);
139 max_fifo = stream_session_fifo_size (&tc->connection);
141 ASSERT (tc->opt.mss < max_fifo);
142 if (available_space < tc->opt.mss && available_space < max_fifo >> 3)
146 * Use the above and what we know about what we've previously advertised
147 * to compute the new window
149 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
150 if (observed_wnd < 0)
153 /* Bad. Thou shalt not shrink */
154 if (available_space < observed_wnd)
157 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
161 wnd = available_space;
164 /* Make sure we have a multiple of rcv_wscale */
165 if (wnd && tc->rcv_wscale)
167 wnd &= ~(1 << tc->rcv_wscale);
169 wnd = 1 << tc->rcv_wscale;
172 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
176 * Write TCP options to segment.
179 tcp_options_write (u8 * data, tcp_options_t * opts)
182 u32 buf, seq_len = 4;
184 if (tcp_opts_mss (opts))
186 *data++ = TCP_OPTION_MSS;
187 *data++ = TCP_OPTION_LEN_MSS;
188 buf = clib_host_to_net_u16 (opts->mss);
189 clib_memcpy (data, &buf, sizeof (opts->mss));
190 data += sizeof (opts->mss);
191 opts_len += TCP_OPTION_LEN_MSS;
194 if (tcp_opts_wscale (opts))
196 *data++ = TCP_OPTION_WINDOW_SCALE;
197 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
198 *data++ = opts->wscale;
199 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
202 if (tcp_opts_sack_permitted (opts))
204 *data++ = TCP_OPTION_SACK_PERMITTED;
205 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
206 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
209 if (tcp_opts_tstamp (opts))
211 *data++ = TCP_OPTION_TIMESTAMP;
212 *data++ = TCP_OPTION_LEN_TIMESTAMP;
213 buf = clib_host_to_net_u32 (opts->tsval);
214 clib_memcpy (data, &buf, sizeof (opts->tsval));
215 data += sizeof (opts->tsval);
216 buf = clib_host_to_net_u32 (opts->tsecr);
217 clib_memcpy (data, &buf, sizeof (opts->tsecr));
218 data += sizeof (opts->tsecr);
219 opts_len += TCP_OPTION_LEN_TIMESTAMP;
222 if (tcp_opts_sack (opts))
225 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
226 TCP_OPTS_MAX_SACK_BLOCKS);
228 if (n_sack_blocks != 0)
230 *data++ = TCP_OPTION_SACK_BLOCK;
231 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
232 for (i = 0; i < n_sack_blocks; i++)
234 buf = clib_host_to_net_u32 (opts->sacks[i].start);
235 clib_memcpy (data, &buf, seq_len);
237 buf = clib_host_to_net_u32 (opts->sacks[i].end);
238 clib_memcpy (data, &buf, seq_len);
241 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
245 /* Terminate TCP options */
248 *data++ = TCP_OPTION_EOL;
249 opts_len += TCP_OPTION_LEN_EOL;
252 /* Pad with zeroes to a u32 boundary */
255 *data++ = TCP_OPTION_NOOP;
256 opts_len += TCP_OPTION_LEN_NOOP;
262 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
266 opts->flags |= TCP_OPTS_FLAG_MSS;
267 opts->mss = dummy_mtu; /*XXX discover that */
268 len += TCP_OPTION_LEN_MSS;
270 opts->flags |= TCP_OPTS_FLAG_WSCALE;
271 opts->wscale = wnd_scale;
272 len += TCP_OPTION_LEN_WINDOW_SCALE;
274 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
275 opts->tsval = tcp_time_now ();
277 len += TCP_OPTION_LEN_TIMESTAMP;
279 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
280 len += TCP_OPTION_LEN_SACK_PERMITTED;
282 /* Align to needed boundary */
283 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
288 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
292 opts->flags |= TCP_OPTS_FLAG_MSS;
294 len += TCP_OPTION_LEN_MSS;
296 if (tcp_opts_wscale (&tc->opt))
298 opts->flags |= TCP_OPTS_FLAG_WSCALE;
299 opts->wscale = tc->rcv_wscale;
300 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 if (tcp_opts_tstamp (&tc->opt))
305 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
306 opts->tsval = tcp_time_now ();
307 opts->tsecr = tc->tsval_recent;
308 len += TCP_OPTION_LEN_TIMESTAMP;
311 if (tcp_opts_sack_permitted (&tc->opt))
313 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
314 len += TCP_OPTION_LEN_SACK_PERMITTED;
317 /* Align to needed boundary */
318 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
323 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
329 if (tcp_opts_tstamp (&tc->opt))
331 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
332 opts->tsval = tcp_time_now ();
333 opts->tsecr = tc->tsval_recent;
334 len += TCP_OPTION_LEN_TIMESTAMP;
336 if (tcp_opts_sack_permitted (&tc->opt))
338 if (vec_len (tc->snd_sacks))
340 opts->flags |= TCP_OPTS_FLAG_SACK;
341 opts->sacks = tc->snd_sacks;
342 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
343 TCP_OPTS_MAX_SACK_BLOCKS);
344 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
348 /* Align to needed boundary */
349 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
354 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
359 case TCP_STATE_ESTABLISHED:
360 case TCP_STATE_FIN_WAIT_1:
361 return tcp_make_established_options (tc, opts);
362 case TCP_STATE_SYN_RCVD:
363 return tcp_make_synack_options (tc, opts);
364 case TCP_STATE_SYN_SENT:
365 return tcp_make_syn_options (opts, tc->rcv_wscale);
367 clib_warning ("Not handled!");
373 * Update max segment size we're able to process.
375 * The value is constrained by our interface's MTU and IP options. It is
376 * also what we advertise to our peer.
379 tcp_update_rcv_mss (tcp_connection_t * tc)
381 /* TODO find our iface MTU */
386 * Update snd_mss to reflect the effective segment size that we can send
387 * by taking into account all TCP options, including SACKs
390 tcp_update_snd_mss (tcp_connection_t * tc)
392 /* Compute options to be used for connection. These may be reused when
393 * sending data or to compute the effective mss (snd_mss) */
395 tcp_make_options (tc, &tc->snd_opts, TCP_STATE_ESTABLISHED);
397 /* XXX check if MTU has been updated */
398 tc->snd_mss = clib_min (tc->mss, tc->opt.mss) - tc->snd_opts_len;
402 tcp_init_mss (tcp_connection_t * tc)
404 tcp_update_rcv_mss (tc);
406 /* TODO cache mss and consider PMTU discovery */
407 tc->snd_mss = clib_min (tc->opt.mss, tc->mss);
409 if (tc->snd_mss == 0)
411 clib_warning ("snd mss is 0");
412 tc->snd_mss = tc->mss;
415 /* We should have enough space for 40 bytes of options */
416 ASSERT (tc->snd_mss > 45);
418 /* If we use timestamp option, account for it */
419 if (tcp_opts_tstamp (&tc->opt))
420 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
423 #define tcp_get_free_buffer_index(tm, bidx) \
425 u32 *my_tx_buffers, n_free_buffers; \
426 u32 thread_index = vlib_get_thread_index(); \
427 my_tx_buffers = tm->tx_buffers[thread_index]; \
428 if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \
430 n_free_buffers = 32; /* TODO config or macro */ \
431 vec_validate (my_tx_buffers, n_free_buffers - 1); \
432 _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list ( \
433 tm->vlib_main, my_tx_buffers, n_free_buffers, \
434 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); \
435 tm->tx_buffers[thread_index] = my_tx_buffers; \
437 /* buffer shortage */ \
438 if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0)) \
440 *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1]; \
441 _vec_len (my_tx_buffers) -= 1; \
444 #define tcp_return_buffer(tm) \
446 u32 *my_tx_buffers; \
447 u32 thread_index = vlib_get_thread_index(); \
448 my_tx_buffers = tm->tx_buffers[thread_index]; \
449 _vec_len (my_tx_buffers) +=1; \
453 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
455 vlib_buffer_t *it = b;
458 it->current_data = 0;
459 it->current_length = 0;
460 it->total_length_not_including_first_buffer = 0;
462 while ((it->flags & VLIB_BUFFER_NEXT_PRESENT)
463 && (it = vlib_get_buffer (vm, it->next_buffer)));
465 /* Leave enough space for headers */
466 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
467 vnet_buffer (b)->tcp.flags = 0;
474 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
477 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
478 u8 tcp_opts_len, tcp_hdr_opts_len;
482 wnd = tcp_window_to_advertise (tc, state);
484 /* Make and write options */
485 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
486 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
488 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
489 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
491 tcp_options_write ((u8 *) (th + 1), snd_opts);
492 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
496 * Convert buffer to ACK
499 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
501 vlib_main_t *vm = vlib_get_main ();
503 tcp_reuse_buffer (vm, b);
504 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
505 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
506 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
507 tc->rcv_las = tc->rcv_nxt;
511 * Convert buffer to FIN-ACK
514 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
516 vlib_main_t *vm = vlib_get_main ();
519 tcp_reuse_buffer (vm, b);
521 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
522 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
524 /* Reset flags, make sure ack is sent */
525 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
531 * Convert buffer to SYN-ACK
534 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
536 vlib_main_t *vm = vlib_get_main ();
537 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
538 u8 tcp_opts_len, tcp_hdr_opts_len;
543 memset (snd_opts, 0, sizeof (*snd_opts));
545 tcp_reuse_buffer (vm, b);
547 /* Set random initial sequence */
548 time_now = tcp_time_now ();
550 tc->iss = random_u32 (&time_now);
551 tc->snd_una = tc->iss;
552 tc->snd_nxt = tc->iss + 1;
553 tc->snd_una_max = tc->snd_nxt;
555 initial_wnd = tcp_initial_window_to_advertise (tc);
557 /* Make and write options */
558 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
559 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
561 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
562 tc->rcv_nxt, tcp_hdr_opts_len,
563 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
565 tcp_options_write ((u8 *) (th + 1), snd_opts);
567 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
568 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
570 /* Init retransmit timer */
571 tcp_retransmit_timer_set (tc);
575 tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
578 u32 *to_next, next_index;
581 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
584 /* Default FIB for now */
585 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
587 /* Send to IP lookup */
588 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
589 f = vlib_get_frame_to_node (vm, next_index);
591 /* Enqueue the packet */
592 to_next = vlib_frame_vector_args (f);
595 vlib_put_frame_to_node (vm, next_index, f);
599 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
600 tcp_state_t state, u32 my_thread_index, u8 is_ip4)
602 u8 tcp_hdr_len = sizeof (tcp_header_t);
606 ip4_address_t src_ip40;
607 ip6_address_t src_ip60;
611 /* Find IP and TCP headers */
614 ih4 = vlib_buffer_get_current (b0);
615 th0 = ip4_next_header (ih4);
619 ih6 = vlib_buffer_get_current (b0);
620 th0 = ip6_next_header (ih6);
623 /* Swap src and dst ip */
626 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
627 src_ip40.as_u32 = ih4->src_address.as_u32;
628 ih4->src_address.as_u32 = ih4->dst_address.as_u32;
629 ih4->dst_address.as_u32 = src_ip40.as_u32;
631 /* Chop the end of the pkt */
632 b0->current_length += ip4_header_bytes (ih4) + tcp_hdr_len;
636 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
637 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
638 clib_memcpy (&ih6->src_address, &ih6->dst_address,
639 sizeof (ip6_address_t));
640 clib_memcpy (&ih6->dst_address, &src_ip60, sizeof (ip6_address_t));
642 /* Chop the end of the pkt */
643 b0->current_length += sizeof (ip6_header_t) + tcp_hdr_len;
646 /* Try to determine what/why we're actually resetting and swap
647 * src and dst ports */
648 if (state == TCP_STATE_CLOSED)
653 tmp = clib_net_to_host_u32 (th0->seq_number);
655 /* Got a SYN for no listener. */
656 th0->flags = TCP_FLAG_RST | TCP_FLAG_ACK;
657 th0->ack_number = clib_host_to_net_u32 (tmp + 1);
661 else if (state >= TCP_STATE_SYN_SENT)
663 th0->flags = TCP_FLAG_RST | TCP_FLAG_ACK;
664 th0->seq_number = th0->ack_number;
668 src_port0 = th0->src_port;
669 th0->src_port = th0->dst_port;
670 th0->dst_port = src_port0;
672 th0->data_offset_and_reserved = (tcp_hdr_len >> 2) << 4;
673 th0->urgent_pointer = 0;
675 /* Compute checksum */
678 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
683 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
691 * Send reset without reusing existing buffer
694 tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4)
698 tcp_main_t *tm = vnet_get_tcp_main ();
699 vlib_main_t *vm = vlib_get_main ();
700 u8 tcp_hdr_len, flags = 0;
701 tcp_header_t *th, *pkt_th;
703 ip4_header_t *ih4, *pkt_ih4;
704 ip6_header_t *ih6, *pkt_ih6;
706 tcp_get_free_buffer_index (tm, &bi);
707 b = vlib_get_buffer (vm, bi);
709 /* Leave enough space for headers */
710 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
712 /* Make and write options */
713 tcp_hdr_len = sizeof (tcp_header_t);
717 pkt_ih4 = vlib_buffer_get_current (pkt);
718 pkt_th = ip4_next_header (pkt_ih4);
722 pkt_ih6 = vlib_buffer_get_current (pkt);
723 pkt_th = ip6_next_header (pkt_ih6);
726 if (tcp_ack (pkt_th))
728 flags = TCP_FLAG_RST;
729 seq = pkt_th->ack_number;
734 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
736 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
739 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
740 seq, ack, tcp_hdr_len, flags, 0);
742 /* Swap src and dst ip */
745 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
746 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
747 &pkt_ih4->src_address, IP_PROTOCOL_TCP);
748 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
753 pkt_ih6 = (ip6_header_t *) (pkt_th - 1);
754 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
757 vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
758 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
759 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
763 tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4);
767 tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
769 tcp_header_t *th = vlib_buffer_get_current (b);
774 ih = vlib_buffer_push_ip4 (tm->vlib_main, b, &tc->c_lcl_ip4,
775 &tc->c_rmt_ip4, IP_PROTOCOL_TCP);
776 th->checksum = ip4_tcp_udp_compute_checksum (tm->vlib_main, b, ih);
783 ih = vlib_buffer_push_ip6 (tm->vlib_main, b, &tc->c_lcl_ip6,
784 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
785 th->checksum = ip6_tcp_udp_icmp_compute_checksum (tm->vlib_main, b, ih,
794 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
795 * The packet is not forwarded through tcpx_output to avoid doing lookups
796 * in the half_open pool.
799 tcp_send_syn (tcp_connection_t * tc)
803 tcp_main_t *tm = vnet_get_tcp_main ();
804 vlib_main_t *vm = vlib_get_main ();
805 u8 tcp_hdr_opts_len, tcp_opts_len;
809 tcp_options_t snd_opts;
811 tcp_get_free_buffer_index (tm, &bi);
812 b = vlib_get_buffer (vm, bi);
814 /* Leave enough space for headers */
815 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
817 /* Set random initial sequence */
818 time_now = tcp_time_now ();
820 tc->iss = random_u32 (&time_now);
821 tc->snd_una = tc->iss;
822 tc->snd_una_max = tc->snd_nxt = tc->iss + 1;
824 initial_wnd = tcp_initial_window_to_advertise (tc);
826 /* Make and write options */
827 memset (&snd_opts, 0, sizeof (snd_opts));
828 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
829 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
831 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
832 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
835 tcp_options_write ((u8 *) (th + 1), &snd_opts);
837 /* Measure RTT with this */
838 tc->rtt_ts = tcp_time_now ();
839 tc->rtt_seq = tc->snd_nxt;
841 /* Start retransmit trimer */
842 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK);
845 /* Set the connection establishment timer */
846 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
848 tcp_push_ip_hdr (tm, tc, b);
849 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
853 tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
855 u32 *to_next, next_index;
858 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
861 /* Decide where to send the packet */
862 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
864 /* Enqueue the packet */
865 f = vlib_get_frame_to_node (vm, next_index);
866 to_next = vlib_frame_vector_args (f);
869 vlib_put_frame_to_node (vm, next_index, f);
876 tcp_send_fin (tcp_connection_t * tc)
880 tcp_main_t *tm = vnet_get_tcp_main ();
881 vlib_main_t *vm = vlib_get_main ();
883 tcp_get_free_buffer_index (tm, &bi);
884 b = vlib_get_buffer (vm, bi);
886 /* Leave enough space for headers */
887 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
889 tcp_make_fin (tc, b);
890 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
891 tc->flags |= TCP_CONN_FINSNT;
892 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
896 tcp_make_state_flags (tcp_state_t next_state)
900 case TCP_STATE_ESTABLISHED:
902 case TCP_STATE_SYN_RCVD:
903 return TCP_FLAG_SYN | TCP_FLAG_ACK;
904 case TCP_STATE_SYN_SENT:
906 case TCP_STATE_LAST_ACK:
907 case TCP_STATE_FIN_WAIT_1:
910 clib_warning ("Shouldn't be here!");
916 * Push TCP header and update connection variables
919 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
920 tcp_state_t next_state, u8 compute_opts)
922 u32 advertise_wnd, data_len;
923 u8 tcp_hdr_opts_len, opts_write_len, flags;
926 data_len = b->current_length;
927 vnet_buffer (b)->tcp.flags = 0;
930 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
932 /* Write pre-computed options */
933 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
935 /* Get rcv window to advertise */
936 advertise_wnd = tcp_window_to_advertise (tc, next_state);
937 flags = tcp_make_state_flags (next_state);
939 /* Push header and options */
940 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
941 tc->rcv_nxt, tcp_hdr_opts_len, flags,
944 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
946 ASSERT (opts_write_len == tc->snd_opts_len);
948 /* Tag the buffer with the connection index */
949 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
951 tc->snd_nxt += data_len;
952 tc->rcv_las = tc->rcv_nxt;
954 /* TODO this is updated in output as well ... */
955 if (tc->snd_nxt > tc->snd_una_max)
956 tc->snd_una_max = tc->snd_nxt;
960 tc->rtt_ts = tcp_time_now ();
961 tc->rtt_seq = tc->snd_nxt;
963 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
967 tcp_send_ack (tcp_connection_t * tc)
969 tcp_main_t *tm = vnet_get_tcp_main ();
970 vlib_main_t *vm = vlib_get_main ();
976 tcp_get_free_buffer_index (tm, &bi);
977 b = vlib_get_buffer (vm, bi);
979 /* Fill in the ACK */
980 tcp_make_ack (tc, b);
981 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
984 /* Send delayed ACK when timer expires */
986 tcp_timer_delack_handler (u32 index)
988 u32 thread_index = vlib_get_thread_index ();
989 tcp_connection_t *tc;
991 tc = tcp_connection_get (index, thread_index);
992 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
996 /** Build a retransmit segment
998 * @return the number of bytes in the segment or 0 if there's nothing to
1002 tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
1003 u32 offset, u32 max_bytes)
1005 vlib_main_t *vm = vlib_get_main ();
1008 tcp_reuse_buffer (vm, b);
1010 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1011 ASSERT (max_bytes != 0);
1013 max_bytes = clib_min (tc->snd_mss, max_bytes);
1015 /* Start is beyond snd_congestion */
1016 if (seq_geq (tc->snd_una + offset, tc->snd_congestion))
1019 /* Don't overshoot snd_congestion */
1020 if (seq_gt (tc->snd_nxt + max_bytes, tc->snd_congestion))
1022 max_bytes = tc->snd_congestion - tc->snd_nxt;
1027 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1029 ASSERT (max_bytes <= tc->snd_mss);
1031 n_bytes = stream_session_peek_bytes (&tc->connection,
1032 vlib_buffer_get_current (b), offset,
1034 ASSERT (n_bytes != 0);
1035 b->current_length = n_bytes;
1036 tcp_push_hdr_i (tc, b, tc->state, 0);
1037 tc->rtx_bytes += n_bytes;
1040 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1045 * Reset congestion control, switch cwnd to loss window and try again.
1048 tcp_rtx_timeout_cc (tcp_connection_t * tc)
1050 /* Cleanly recover cc (also clears up fast retransmit) */
1051 if (tcp_in_fastrecovery (tc))
1053 tcp_cc_recover (tc);
1057 tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
1060 /* Start again from the beginning */
1062 tc->cwnd = tcp_loss_wnd (tc);
1063 tc->snd_congestion = tc->snd_una_max;
1064 tcp_recovery_on (tc);
1068 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1070 tcp_main_t *tm = vnet_get_tcp_main ();
1071 vlib_main_t *vm = vlib_get_main ();
1072 u32 thread_index = vlib_get_thread_index ();
1073 tcp_connection_t *tc;
1079 tc = tcp_half_open_connection_get (index);
1083 tc = tcp_connection_get (index, thread_index);
1086 /* Make sure timer handle is set to invalid */
1087 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1089 /* Increment RTO backoff (also equal to number of retries) */
1092 /* Go back to first un-acked byte */
1093 tc->snd_nxt = tc->snd_una;
1096 tcp_get_free_buffer_index (tm, &bi);
1097 b = vlib_get_buffer (vm, bi);
1099 if (tc->state >= TCP_STATE_ESTABLISHED)
1101 /* First retransmit timeout */
1102 if (tc->rto_boff == 1)
1103 tcp_rtx_timeout_cc (tc);
1105 /* Exponential backoff */
1106 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1108 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1110 /* Send one segment. No fancy recovery for now! */
1111 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1112 scoreboard_clear (&tc->sack_sb);
1116 clib_warning ("could not retransmit");
1122 /* Retransmit for SYN/SYNACK */
1123 ASSERT (tc->state == TCP_STATE_SYN_RCVD
1124 || tc->state == TCP_STATE_SYN_SENT);
1126 /* Try without increasing RTO a number of times. If this fails,
1127 * start growing RTO exponentially */
1128 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1129 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1131 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
1133 tcp_push_hdr_i (tc, b, tc->state, 1);
1135 /* Account for the SYN */
1141 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1143 /* Re-enable retransmit timer */
1144 tcp_retransmit_timer_set (tc);
1148 ASSERT (tc->state == TCP_STATE_SYN_SENT);
1150 TCP_EVT_DBG (TCP_EVT_SYN_RTX, tc);
1152 /* This goes straight to ipx_lookup */
1153 tcp_push_ip_hdr (tm, tc, b);
1154 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
1156 /* Re-enable retransmit timer */
1157 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN,
1158 tc->rto * TCP_TO_TIMER_TICK);
1163 tcp_timer_retransmit_handler (u32 index)
1165 tcp_timer_retransmit_handler_i (index, 0);
1169 tcp_timer_retransmit_syn_handler (u32 index)
1171 tcp_timer_retransmit_handler_i (index, 1);
1175 * Got 0 snd_wnd from peer, try to do something about it.
1179 tcp_timer_persist_handler (u32 index)
1181 tcp_main_t *tm = vnet_get_tcp_main ();
1182 vlib_main_t *vm = vlib_get_main ();
1183 u32 thread_index = vlib_get_thread_index ();
1184 tcp_connection_t *tc;
1188 tc = tcp_connection_get (index, thread_index);
1190 /* Make sure timer handle is set to invalid */
1191 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1193 /* Problem already solved or worse */
1194 if (tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1197 /* Increment RTO backoff */
1199 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1201 /* Try to force the first unsent segment */
1202 tcp_get_free_buffer_index (tm, &bi);
1203 b = vlib_get_buffer (vm, bi);
1204 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1205 n_bytes = stream_session_peek_bytes (&tc->connection,
1206 vlib_buffer_get_current (b),
1207 tc->snd_una_max - tc->snd_una,
1209 /* Nothing to send */
1212 tcp_return_buffer (tm);
1216 b->current_length = n_bytes;
1217 tcp_push_hdr_i (tc, b, tc->state, 0);
1218 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1220 /* Re-enable persist timer */
1221 tcp_persist_timer_set (tc);
1225 * Retransmit first unacked segment
1228 tcp_retransmit_first_unacked (tcp_connection_t * tc)
1230 tcp_main_t *tm = vnet_get_tcp_main ();
1231 vlib_main_t *vm = vlib_get_main ();
1235 tc->snd_nxt = tc->snd_una;
1238 tcp_get_free_buffer_index (tm, &bi);
1239 b = vlib_get_buffer (vm, bi);
1241 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1243 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1247 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1250 tc->snd_nxt = tc->snd_una_max;
1253 sack_scoreboard_hole_t *
1254 scoreboard_first_rtx_hole (sack_scoreboard_t * sb)
1256 sack_scoreboard_hole_t *hole = 0;
1258 // hole = scoreboard_first_hole (&tc->sack_sb);
1262 // offset = hole->start - tc->snd_una;
1263 // hole_size = hole->end - hole->start;
1265 // ASSERT(hole_size);
1267 // if (hole_size < max_bytes)
1268 // max_bytes = hole_size;
1274 * Do fast retransmit.
1277 tcp_fast_retransmit (tcp_connection_t * tc)
1279 tcp_main_t *tm = vnet_get_tcp_main ();
1280 vlib_main_t *vm = vlib_get_main ();
1283 u32 n_written = 0, offset = 0;
1287 ASSERT (tcp_in_fastrecovery (tc));
1289 /* Start resending from first un-acked segment */
1290 tc->snd_nxt = tc->snd_una;
1292 snd_space = tcp_available_snd_space (tc);
1293 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1295 /* If we have SACKs use them */
1296 if (tcp_opts_sack_permitted (&tc->opt)
1297 && scoreboard_first_hole (&tc->sack_sb))
1300 while (snd_space > 0)
1302 tcp_get_free_buffer_index (tm, &bi);
1303 b = vlib_get_buffer (vm, bi);
1307 scoreboard_first_rtx_hole (&tc->sack_sb);
1311 offset += n_written;
1314 n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
1316 /* Nothing left to retransmit */
1319 tcp_return_buffer (tm);
1323 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1324 snd_space -= n_written;
1327 /* If window allows, send 1 SMSS of new data */
1328 if (seq_lt (tc->snd_nxt, tc->snd_congestion))
1329 tc->snd_nxt = tc->snd_congestion;
1333 tcp_session_has_ooo_data (tcp_connection_t * tc)
1335 stream_session_t *s =
1336 stream_session_get (tc->c_s_index, tc->c_thread_index);
1337 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1341 tcp46_output_inline (vlib_main_t * vm,
1342 vlib_node_runtime_t * node,
1343 vlib_frame_t * from_frame, int is_ip4)
1345 u32 n_left_from, next_index, *from, *to_next;
1346 u32 my_thread_index = vm->thread_index;
1348 from = vlib_frame_vector_args (from_frame);
1349 n_left_from = from_frame->n_vectors;
1351 next_index = node->cached_next_index;
1353 while (n_left_from > 0)
1357 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1359 while (n_left_from > 0 && n_left_to_next > 0)
1363 tcp_connection_t *tc0;
1365 tcp_header_t *th0 = 0;
1366 u32 error0 = TCP_ERROR_PKTS_SENT, next0 = TCP_OUTPUT_NEXT_IP_LOOKUP;
1373 n_left_to_next -= 1;
1375 b0 = vlib_get_buffer (vm, bi0);
1376 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1378 if (PREDICT_FALSE (tc0 == 0 || tc0->state == TCP_STATE_CLOSED))
1380 error0 = TCP_ERROR_INVALID_CONNECTION;
1381 next0 = TCP_OUTPUT_NEXT_DROP;
1385 th0 = vlib_buffer_get_current (b0);
1386 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1391 ih0 = vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4,
1392 &tc0->c_rmt_ip4, IP_PROTOCOL_TCP);
1393 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih0);
1400 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1401 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1402 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih0,
1407 /* Filter out DUPACKs if there are no OOO segments left */
1409 (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1411 if (!tcp_session_has_ooo_data (tc0))
1413 error0 = TCP_ERROR_FILTERED_DUPACKS;
1414 next0 = TCP_OUTPUT_NEXT_DROP;
1419 /* Stop DELACK timer and fix flags */
1420 tc0->flags &= ~(TCP_CONN_SNDACK);
1421 if (tcp_timer_is_active (tc0, TCP_TIMER_DELACK))
1423 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
1426 /* If not retransmitting
1427 * 1) update snd_una_max (SYN, SYNACK, FIN)
1428 * 2) If we're not tracking an ACK, start tracking */
1429 if (seq_lt (tc0->snd_una_max, tc0->snd_nxt))
1431 tc0->snd_una_max = tc0->snd_nxt;
1432 if (tc0->rtt_ts == 0)
1434 tc0->rtt_ts = tcp_time_now ();
1435 tc0->rtt_seq = tc0->snd_nxt;
1439 /* Set the retransmit timer if not set already and not
1440 * doing a pure ACK */
1441 if (!tcp_timer_is_active (tc0, TCP_TIMER_RETRANSMIT)
1442 && tc0->snd_nxt != tc0->snd_una)
1444 tcp_retransmit_timer_set (tc0);
1448 /* set fib index to default and lookup node */
1449 /* XXX network virtualization (vrf/vni) */
1450 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1451 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1453 b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
1455 b0->error = node->errors[error0];
1456 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1458 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1461 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1465 memset (&t0->tcp_header, 0, sizeof (t0->tcp_header));
1467 clib_memcpy (&t0->tcp_connection, tc0,
1468 sizeof (t0->tcp_connection));
1471 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1472 n_left_to_next, bi0, next0);
1475 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1478 return from_frame->n_vectors;
1482 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1483 vlib_frame_t * from_frame)
1485 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1489 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1490 vlib_frame_t * from_frame)
1492 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1496 VLIB_REGISTER_NODE (tcp4_output_node) =
1498 .function = tcp4_output,.name = "tcp4-output",
1499 /* Takes a vector of packets. */
1500 .vector_size = sizeof (u32),
1501 .n_errors = TCP_N_ERROR,
1502 .error_strings = tcp_error_strings,
1503 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1505 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1506 foreach_tcp4_output_next
1509 .format_buffer = format_tcp_header,
1510 .format_trace = format_tcp_tx_trace,
1514 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
1517 VLIB_REGISTER_NODE (tcp6_output_node) =
1519 .function = tcp6_output,
1520 .name = "tcp6-output",
1521 /* Takes a vector of packets. */
1522 .vector_size = sizeof (u32),
1523 .n_errors = TCP_N_ERROR,
1524 .error_strings = tcp_error_strings,
1525 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1527 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1528 foreach_tcp6_output_next
1531 .format_buffer = format_tcp_header,
1532 .format_trace = format_tcp_tx_trace,
1536 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
1539 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1541 tcp_connection_t *tc;
1543 tc = (tcp_connection_t *) tconn;
1544 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0);
1548 typedef enum _tcp_reset_next
1550 TCP_RESET_NEXT_DROP,
1551 TCP_RESET_NEXT_IP_LOOKUP,
1555 #define foreach_tcp4_reset_next \
1556 _(DROP, "error-drop") \
1557 _(IP_LOOKUP, "ip4-lookup")
1559 #define foreach_tcp6_reset_next \
1560 _(DROP, "error-drop") \
1561 _(IP_LOOKUP, "ip6-lookup")
1564 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1565 vlib_frame_t * from_frame, u8 is_ip4)
1567 u32 n_left_from, next_index, *from, *to_next;
1568 u32 my_thread_index = vm->thread_index;
1570 from = vlib_frame_vector_args (from_frame);
1571 n_left_from = from_frame->n_vectors;
1573 next_index = node->cached_next_index;
1575 while (n_left_from > 0)
1579 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1581 while (n_left_from > 0 && n_left_to_next > 0)
1587 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
1594 n_left_to_next -= 1;
1596 b0 = vlib_get_buffer (vm, bi0);
1598 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
1599 my_thread_index, is_ip4))
1601 error0 = TCP_ERROR_LOOKUP_DROPS;
1602 next0 = TCP_RESET_NEXT_DROP;
1606 /* Prepare to send to IP lookup */
1607 vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0;
1608 next0 = TCP_RESET_NEXT_IP_LOOKUP;
1611 b0->error = node->errors[error0];
1612 b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
1613 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1615 th0 = vlib_buffer_get_current (b0);
1617 th0 = ip4_next_header ((ip4_header_t *) th0);
1619 th0 = ip6_next_header ((ip6_header_t *) th0);
1620 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1621 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1624 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1625 n_left_to_next, bi0, next0);
1627 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1629 return from_frame->n_vectors;
1633 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1634 vlib_frame_t * from_frame)
1636 return tcp46_send_reset_inline (vm, node, from_frame, 1);
1640 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1641 vlib_frame_t * from_frame)
1643 return tcp46_send_reset_inline (vm, node, from_frame, 0);
1647 VLIB_REGISTER_NODE (tcp4_reset_node) = {
1648 .function = tcp4_send_reset,
1649 .name = "tcp4-reset",
1650 .vector_size = sizeof (u32),
1651 .n_errors = TCP_N_ERROR,
1652 .error_strings = tcp_error_strings,
1653 .n_next_nodes = TCP_RESET_N_NEXT,
1655 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1656 foreach_tcp4_reset_next
1659 .format_trace = format_tcp_tx_trace,
1663 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
1666 VLIB_REGISTER_NODE (tcp6_reset_node) = {
1667 .function = tcp6_send_reset,
1668 .name = "tcp6-reset",
1669 .vector_size = sizeof (u32),
1670 .n_errors = TCP_N_ERROR,
1671 .error_strings = tcp_error_strings,
1672 .n_next_nodes = TCP_RESET_N_NEXT,
1674 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1675 foreach_tcp6_reset_next
1678 .format_trace = format_tcp_tx_trace,
1682 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
1685 * fd.io coding-style-patch-verification: ON
1688 * eval: (c-set-style "gnu")