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_next
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, &t->tcp_connection, 1);
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_rx_fifo_size (&tc->connection);
141 ASSERT (tc->rcv_opts.mss < max_fifo);
142 if (available_space < tc->rcv_opts.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;
281 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
282 len += TCP_OPTION_LEN_SACK_PERMITTED;
285 /* Align to needed boundary */
286 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
291 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
295 opts->flags |= TCP_OPTS_FLAG_MSS;
297 len += TCP_OPTION_LEN_MSS;
299 if (tcp_opts_wscale (&tc->rcv_opts))
301 opts->flags |= TCP_OPTS_FLAG_WSCALE;
302 opts->wscale = tc->rcv_wscale;
303 len += TCP_OPTION_LEN_WINDOW_SCALE;
306 if (tcp_opts_tstamp (&tc->rcv_opts))
308 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
309 opts->tsval = tcp_time_now ();
310 opts->tsecr = tc->tsval_recent;
311 len += TCP_OPTION_LEN_TIMESTAMP;
314 if (tcp_opts_sack_permitted (&tc->rcv_opts))
316 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
317 len += TCP_OPTION_LEN_SACK_PERMITTED;
320 /* Align to needed boundary */
321 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
326 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
332 if (tcp_opts_tstamp (&tc->rcv_opts))
334 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
335 opts->tsval = tcp_time_now ();
336 opts->tsecr = tc->tsval_recent;
337 len += TCP_OPTION_LEN_TIMESTAMP;
339 if (tcp_opts_sack_permitted (&tc->rcv_opts))
341 if (vec_len (tc->snd_sacks))
343 opts->flags |= TCP_OPTS_FLAG_SACK;
344 opts->sacks = tc->snd_sacks;
345 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
346 TCP_OPTS_MAX_SACK_BLOCKS);
347 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
351 /* Align to needed boundary */
352 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
357 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
362 case TCP_STATE_ESTABLISHED:
363 case TCP_STATE_FIN_WAIT_1:
364 return tcp_make_established_options (tc, opts);
365 case TCP_STATE_SYN_RCVD:
366 return tcp_make_synack_options (tc, opts);
367 case TCP_STATE_SYN_SENT:
368 return tcp_make_syn_options (opts, tc->rcv_wscale);
370 clib_warning ("Not handled!");
376 * Update max segment size we're able to process.
378 * The value is constrained by our interface's MTU and IP options. It is
379 * also what we advertise to our peer.
382 tcp_update_rcv_mss (tcp_connection_t * tc)
384 /* TODO find our iface MTU */
389 * Update snd_mss to reflect the effective segment size that we can send
390 * by taking into account all TCP options, including SACKs
393 tcp_update_snd_mss (tcp_connection_t * tc)
395 /* Compute options to be used for connection. These may be reused when
396 * sending data or to compute the effective mss (snd_mss) */
398 tcp_make_options (tc, &tc->snd_opts, TCP_STATE_ESTABLISHED);
400 /* XXX check if MTU has been updated */
401 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
402 ASSERT (tc->snd_mss > 0);
406 tcp_init_mss (tcp_connection_t * tc)
408 u16 default_min_mss = 536;
409 tcp_update_rcv_mss (tc);
411 /* TODO cache mss and consider PMTU discovery */
412 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
414 if (tc->snd_mss < 45)
416 clib_warning ("snd mss is 0");
417 /* Assume that at least the min default mss works */
418 tc->snd_mss = default_min_mss;
419 tc->rcv_opts.mss = default_min_mss;
422 /* We should have enough space for 40 bytes of options */
423 ASSERT (tc->snd_mss > 45);
425 /* If we use timestamp option, account for it */
426 if (tcp_opts_tstamp (&tc->rcv_opts))
427 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
430 #define tcp_get_free_buffer_index(tm, bidx) \
432 u32 *my_tx_buffers, n_free_buffers; \
433 u32 thread_index = vlib_get_thread_index(); \
434 my_tx_buffers = tm->tx_buffers[thread_index]; \
435 if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \
437 n_free_buffers = 32; /* TODO config or macro */ \
438 vec_validate (my_tx_buffers, n_free_buffers - 1); \
439 _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list ( \
440 vlib_get_main(), my_tx_buffers, n_free_buffers, \
441 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); \
442 tm->tx_buffers[thread_index] = my_tx_buffers; \
444 /* buffer shortage */ \
445 if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0)) \
447 *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1]; \
448 _vec_len (my_tx_buffers) -= 1; \
451 #define tcp_return_buffer(tm) \
453 u32 *my_tx_buffers; \
454 u32 thread_index = vlib_get_thread_index(); \
455 my_tx_buffers = tm->tx_buffers[thread_index]; \
456 _vec_len (my_tx_buffers) +=1; \
460 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
462 vlib_buffer_t *it = b;
465 it->current_data = 0;
466 it->current_length = 0;
467 it->total_length_not_including_first_buffer = 0;
469 while ((it->flags & VLIB_BUFFER_NEXT_PRESENT)
470 && (it = vlib_get_buffer (vm, it->next_buffer)));
472 /* Leave enough space for headers */
473 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
474 vnet_buffer (b)->tcp.flags = 0;
481 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
484 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
485 u8 tcp_opts_len, tcp_hdr_opts_len;
489 wnd = tcp_window_to_advertise (tc, state);
491 /* Make and write options */
492 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
493 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
495 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
496 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
498 tcp_options_write ((u8 *) (th + 1), snd_opts);
499 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
503 * Convert buffer to ACK
506 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
508 vlib_main_t *vm = vlib_get_main ();
510 tcp_reuse_buffer (vm, b);
511 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
512 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
513 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
514 tc->rcv_las = tc->rcv_nxt;
518 * Convert buffer to FIN-ACK
521 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
523 vlib_main_t *vm = vlib_get_main ();
526 tcp_reuse_buffer (vm, b);
528 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
529 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
531 /* Reset flags, make sure ack is sent */
532 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
538 * Convert buffer to SYN-ACK
541 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
543 vlib_main_t *vm = vlib_get_main ();
544 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
545 u8 tcp_opts_len, tcp_hdr_opts_len;
550 memset (snd_opts, 0, sizeof (*snd_opts));
552 tcp_reuse_buffer (vm, b);
554 /* Set random initial sequence */
555 time_now = tcp_time_now ();
557 tc->iss = random_u32 (&time_now);
558 tc->snd_una = tc->iss;
559 tc->snd_nxt = tc->iss + 1;
560 tc->snd_una_max = tc->snd_nxt;
562 initial_wnd = tcp_initial_window_to_advertise (tc);
564 /* Make and write options */
565 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
566 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
568 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
569 tc->rcv_nxt, tcp_hdr_opts_len,
570 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
572 tcp_options_write ((u8 *) (th + 1), snd_opts);
574 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
575 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
577 /* Init retransmit timer */
578 tcp_retransmit_timer_set (tc);
582 tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
585 u32 *to_next, next_index;
588 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
591 /* Default FIB for now */
592 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
594 /* Send to IP lookup */
595 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
596 f = vlib_get_frame_to_node (vm, next_index);
598 /* Enqueue the packet */
599 to_next = vlib_frame_vector_args (f);
602 vlib_put_frame_to_node (vm, next_index, f);
606 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
607 tcp_state_t state, u8 thread_index, u8 is_ip4)
612 ip4_address_t src_ip40, dst_ip40;
613 ip6_address_t src_ip60, dst_ip60;
614 u16 src_port, dst_port;
619 /* Find IP and TCP headers */
620 th0 = tcp_buffer_hdr (b0);
622 /* Save src and dst ip */
625 ih4 = vlib_buffer_get_current (b0);
626 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
627 src_ip40.as_u32 = ih4->src_address.as_u32;
628 dst_ip40.as_u32 = ih4->dst_address.as_u32;
632 ih6 = vlib_buffer_get_current (b0);
633 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
634 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
635 clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
638 src_port = th0->src_port;
639 dst_port = th0->dst_port;
641 /* Try to determine what/why we're actually resetting */
642 if (state == TCP_STATE_CLOSED)
647 tmp = clib_net_to_host_u32 (th0->seq_number);
649 /* Got a SYN for no listener. */
650 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
651 ack = clib_host_to_net_u32 (tmp + 1);
656 flags = TCP_FLAG_RST;
657 seq = th0->ack_number;
661 tcp_reuse_buffer (vm, b0);
662 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
663 sizeof (tcp_header_t), flags, 0);
667 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
669 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
674 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
676 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
684 * Send reset without reusing existing buffer
687 tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4)
691 tcp_main_t *tm = vnet_get_tcp_main ();
692 vlib_main_t *vm = vlib_get_main ();
693 u8 tcp_hdr_len, flags = 0;
694 tcp_header_t *th, *pkt_th;
696 ip4_header_t *ih4, *pkt_ih4;
697 ip6_header_t *ih6, *pkt_ih6;
699 tcp_get_free_buffer_index (tm, &bi);
700 b = vlib_get_buffer (vm, bi);
702 /* Leave enough space for headers */
703 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
705 /* Make and write options */
706 tcp_hdr_len = sizeof (tcp_header_t);
710 pkt_ih4 = vlib_buffer_get_current (pkt);
711 pkt_th = ip4_next_header (pkt_ih4);
715 pkt_ih6 = vlib_buffer_get_current (pkt);
716 pkt_th = ip6_next_header (pkt_ih6);
719 if (tcp_ack (pkt_th))
721 flags = TCP_FLAG_RST;
722 seq = pkt_th->ack_number;
727 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
729 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
732 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
733 seq, ack, tcp_hdr_len, flags, 0);
735 /* Swap src and dst ip */
738 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
739 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
740 &pkt_ih4->src_address, IP_PROTOCOL_TCP);
741 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
746 pkt_ih6 = (ip6_header_t *) (pkt_th - 1);
747 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
750 vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
751 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
752 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
756 tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4);
760 tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
762 tcp_header_t *th = vlib_buffer_get_current (b);
763 vlib_main_t *vm = vlib_get_main ();
767 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
768 &tc->c_rmt_ip4, IP_PROTOCOL_TCP);
769 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
776 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
777 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
778 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
786 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
787 * The packet is not forwarded through tcpx_output to avoid doing lookups
788 * in the half_open pool.
791 tcp_send_syn (tcp_connection_t * tc)
795 tcp_main_t *tm = vnet_get_tcp_main ();
796 vlib_main_t *vm = vlib_get_main ();
797 u8 tcp_hdr_opts_len, tcp_opts_len;
801 tcp_options_t snd_opts;
803 tcp_get_free_buffer_index (tm, &bi);
804 b = vlib_get_buffer (vm, bi);
806 /* Leave enough space for headers */
807 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
809 /* Set random initial sequence */
810 time_now = tcp_time_now ();
812 tc->iss = random_u32 (&time_now);
813 tc->snd_una = tc->iss;
814 tc->snd_una_max = tc->snd_nxt = tc->iss + 1;
816 initial_wnd = tcp_initial_window_to_advertise (tc);
818 /* Make and write options */
819 memset (&snd_opts, 0, sizeof (snd_opts));
820 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
821 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
823 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
824 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
827 tcp_options_write ((u8 *) (th + 1), &snd_opts);
829 /* Measure RTT with this */
830 tc->rtt_ts = tcp_time_now ();
831 tc->rtt_seq = tc->snd_nxt;
833 /* Start retransmit trimer */
834 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK);
837 /* Set the connection establishment timer */
838 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
840 tcp_push_ip_hdr (tm, tc, b);
841 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
845 tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
847 u32 *to_next, next_index;
850 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
853 /* Decide where to send the packet */
854 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
856 /* Initialize the trajectory trace, if configured */
857 if (VLIB_BUFFER_TRACE_TRAJECTORY > 0)
860 b->pre_data[1] = next_index;
863 /* Enqueue the packet */
864 f = vlib_get_frame_to_node (vm, next_index);
865 to_next = vlib_frame_vector_args (f);
868 vlib_put_frame_to_node (vm, next_index, f);
875 tcp_send_fin (tcp_connection_t * tc)
879 tcp_main_t *tm = vnet_get_tcp_main ();
880 vlib_main_t *vm = vlib_get_main ();
882 tcp_get_free_buffer_index (tm, &bi);
883 b = vlib_get_buffer (vm, bi);
885 /* Leave enough space for headers */
886 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
888 tcp_make_fin (tc, b);
889 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
890 tc->flags |= TCP_CONN_FINSNT;
891 tcp_retransmit_timer_force_update (tc);
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 + b->total_length_not_including_first_buffer;
927 vnet_buffer (b)->tcp.flags = 0;
930 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
932 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
933 advertise_wnd = tcp_window_to_advertise (tc, next_state);
934 flags = tcp_make_state_flags (next_state);
936 /* Push header and options */
937 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
938 tc->rcv_nxt, tcp_hdr_opts_len, flags,
940 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
942 ASSERT (opts_write_len == tc->snd_opts_len);
943 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
946 * Update connection variables
949 tc->snd_nxt += data_len;
950 tc->rcv_las = tc->rcv_nxt;
952 /* TODO this is updated in output as well ... */
953 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
955 tc->snd_una_max = tc->snd_nxt;
956 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
959 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
963 tcp_send_ack (tcp_connection_t * tc)
965 tcp_main_t *tm = vnet_get_tcp_main ();
966 vlib_main_t *vm = vlib_get_main ();
972 tcp_get_free_buffer_index (tm, &bi);
973 b = vlib_get_buffer (vm, bi);
975 /* Fill in the ACK */
976 tcp_make_ack (tc, b);
977 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
980 /* Send delayed ACK when timer expires */
982 tcp_timer_delack_handler (u32 index)
984 u32 thread_index = vlib_get_thread_index ();
985 tcp_connection_t *tc;
987 tc = tcp_connection_get (index, thread_index);
988 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
992 /** Build a retransmit segment
994 * @return the number of bytes in the segment or 0 if there's nothing to
998 tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
999 u32 offset, u32 max_bytes)
1001 vlib_main_t *vm = vlib_get_main ();
1005 tcp_reuse_buffer (vm, b);
1007 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1008 ASSERT (max_bytes != 0);
1010 max_bytes = clib_min (tc->snd_mss, max_bytes);
1011 start = tc->snd_una + offset;
1013 /* Start is beyond snd_congestion */
1014 if (seq_geq (start, tc->snd_congestion))
1017 /* Don't overshoot snd_congestion */
1018 if (seq_gt (start + max_bytes, tc->snd_congestion))
1020 max_bytes = tc->snd_congestion - start;
1025 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1027 ASSERT (max_bytes <= tc->snd_mss);
1029 n_bytes = stream_session_peek_bytes (&tc->connection,
1030 vlib_buffer_get_current (b), offset,
1032 ASSERT (n_bytes > 0);
1033 b->current_length = n_bytes;
1034 tcp_push_hdr_i (tc, b, tc->state, 0);
1036 if (tcp_in_fastrecovery (tc))
1037 tc->snd_rxt_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 tc->prev_ssthresh = tc->ssthresh;
1051 tc->prev_cwnd = tc->cwnd;
1053 /* Cleanly recover cc (also clears up fast retransmit) */
1054 if (tcp_in_fastrecovery (tc))
1055 tcp_cc_fastrecovery_exit (tc);
1057 /* Start again from the beginning */
1058 tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
1059 tc->cwnd = tcp_loss_wnd (tc);
1060 tc->snd_congestion = tc->snd_una_max;
1062 tcp_recovery_on (tc);
1066 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1068 tcp_main_t *tm = vnet_get_tcp_main ();
1069 vlib_main_t *vm = vlib_get_main ();
1070 u32 thread_index = vlib_get_thread_index ();
1071 tcp_connection_t *tc;
1077 tc = tcp_half_open_connection_get (index);
1081 tc = tcp_connection_get (index, thread_index);
1084 /* Make sure timer handle is set to invalid */
1085 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1087 if (!tcp_in_recovery (tc) && tc->rto_boff > 0
1088 && tc->state >= TCP_STATE_ESTABLISHED)
1091 tcp_update_rto (tc);
1094 /* Increment RTO backoff (also equal to number of retries) */
1097 /* Go back to first un-acked byte */
1098 tc->snd_nxt = tc->snd_una;
1100 tcp_get_free_buffer_index (tm, &bi);
1101 b = vlib_get_buffer (vm, bi);
1103 if (tc->state >= TCP_STATE_ESTABLISHED)
1105 /* Lost FIN, retransmit and return */
1106 if (tc->flags & TCP_CONN_FINSNT)
1112 /* First retransmit timeout */
1113 if (tc->rto_boff == 1)
1114 tcp_rtx_timeout_cc (tc);
1116 /* Exponential backoff */
1117 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1119 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1121 /* Send one segment */
1122 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1123 /* TODO be less aggressive about this */
1124 scoreboard_clear (&tc->sack_sb);
1128 clib_warning ("could not retransmit anything");
1129 clib_warning ("%U", format_tcp_connection, tc, 2);
1131 /* Try again eventually */
1132 tcp_retransmit_timer_set (tc);
1133 ASSERT (0 || (tc->rto_boff > 1
1134 && tc->snd_una == tc->snd_congestion));
1138 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1139 if (tc->rto_boff == 1)
1140 tc->snd_rxt_ts = tcp_time_now ();
1142 /* Retransmit for SYN/SYNACK */
1143 else if (tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_SYN_SENT)
1145 /* Try without increasing RTO a number of times. If this fails,
1146 * start growing RTO exponentially */
1147 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1148 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1150 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
1152 tcp_push_hdr_i (tc, b, tc->state, 1);
1154 /* Account for the SYN */
1160 ASSERT (tc->state == TCP_STATE_CLOSED);
1161 clib_warning ("connection closed ...");
1167 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1169 /* Re-enable retransmit timer */
1170 tcp_retransmit_timer_set (tc);
1174 ASSERT (tc->state == TCP_STATE_SYN_SENT);
1176 TCP_EVT_DBG (TCP_EVT_SYN_RTX, tc);
1178 /* This goes straight to ipx_lookup */
1179 tcp_push_ip_hdr (tm, tc, b);
1180 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
1182 /* Re-enable retransmit timer */
1183 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN,
1184 tc->rto * TCP_TO_TIMER_TICK);
1189 tcp_timer_retransmit_handler (u32 index)
1191 tcp_timer_retransmit_handler_i (index, 0);
1195 tcp_timer_retransmit_syn_handler (u32 index)
1197 tcp_timer_retransmit_handler_i (index, 1);
1201 * Got 0 snd_wnd from peer, try to do something about it.
1205 tcp_timer_persist_handler (u32 index)
1207 tcp_main_t *tm = vnet_get_tcp_main ();
1208 vlib_main_t *vm = vlib_get_main ();
1209 u32 thread_index = vlib_get_thread_index ();
1210 tcp_connection_t *tc;
1212 u32 bi, old_snd_nxt;
1215 tc = tcp_connection_get_if_valid (index, thread_index);
1220 /* Make sure timer handle is set to invalid */
1221 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1223 /* Problem already solved or worse */
1224 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1225 || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1228 /* Increment RTO backoff */
1230 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1232 /* Try to force the first unsent segment */
1233 tcp_get_free_buffer_index (tm, &bi);
1234 b = vlib_get_buffer (vm, bi);
1236 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1237 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1238 n_bytes = stream_session_peek_bytes (&tc->connection,
1239 vlib_buffer_get_current (b),
1240 tc->snd_una_max - tc->snd_una,
1242 /* Nothing to send */
1245 // clib_warning ("persist found nothing to send");
1246 tcp_return_buffer (tm);
1250 b->current_length = n_bytes;
1251 ASSERT (tc->snd_nxt == tc->snd_una_max || tc->rto_boff > 1
1252 || tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1254 /* Allow updating of snd_una_max but don't update snd_nxt */
1255 old_snd_nxt = tc->snd_nxt;
1256 tcp_push_hdr_i (tc, b, tc->state, 0);
1257 tc->snd_nxt = old_snd_nxt;
1258 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1260 /* Re-enable persist timer */
1261 tcp_persist_timer_set (tc);
1265 * Retransmit first unacked segment
1268 tcp_retransmit_first_unacked (tcp_connection_t * tc)
1270 tcp_main_t *tm = vnet_get_tcp_main ();
1271 vlib_main_t *vm = vlib_get_main ();
1273 u32 bi, n_bytes, old_snd_nxt;
1275 old_snd_nxt = tc->snd_nxt;
1276 tc->snd_nxt = tc->snd_una;
1279 tcp_get_free_buffer_index (tm, &bi);
1280 b = vlib_get_buffer (vm, bi);
1282 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1284 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1287 tcp_return_buffer (tm);
1291 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1294 tc->snd_nxt = old_snd_nxt;
1298 * Do fast retransmit with SACKs
1301 tcp_fast_retransmit_sack (tcp_connection_t * tc)
1303 tcp_main_t *tm = vnet_get_tcp_main ();
1304 vlib_main_t *vm = vlib_get_main ();
1305 u32 n_written = 0, offset = 0, max_bytes;
1307 sack_scoreboard_hole_t *hole;
1308 sack_scoreboard_t *sb;
1309 u32 bi, old_snd_nxt;
1311 u8 snd_limited = 0, can_rescue = 0;
1313 ASSERT (tcp_in_fastrecovery (tc));
1314 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1316 old_snd_nxt = tc->snd_nxt;
1318 snd_space = tcp_available_snd_space (tc);
1320 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1321 while (hole && snd_space > 0)
1323 tcp_get_free_buffer_index (tm, &bi);
1324 b = vlib_get_buffer (vm, bi);
1326 hole = scoreboard_next_rxt_hole (sb, hole,
1327 tcp_fastrecovery_sent_1_smss (tc),
1328 &can_rescue, &snd_limited);
1331 if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
1332 || seq_gt (sb->rescue_rxt,
1333 tc->snd_congestion)))
1336 /* If rescue rxt undefined or less than snd_una then one segment of
1337 * up to SMSS octets that MUST include the highest outstanding
1338 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1339 * RecoveryPoint. HighRxt MUST NOT be updated.
1341 max_bytes = clib_min (tc->snd_mss, snd_space);
1342 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1343 sb->rescue_rxt = tc->snd_congestion;
1344 tc->snd_nxt = tc->snd_una + offset;
1345 tcp_prepare_retransmit_segment (tc, b, offset, max_bytes);
1346 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1350 max_bytes = snd_limited ? tc->snd_mss : hole->end - sb->high_rxt;
1351 offset = sb->high_rxt - tc->snd_una;
1352 tc->snd_nxt = tc->snd_una + offset;
1353 n_written = tcp_prepare_retransmit_segment (tc, b, offset, max_bytes);
1355 /* Nothing left to retransmit */
1358 tcp_return_buffer (tm);
1362 sb->high_rxt += n_written;
1363 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1364 snd_space -= n_written;
1367 /* If window allows, send 1 SMSS of new data */
1368 tc->snd_nxt = old_snd_nxt;
1372 * Fast retransmit without SACK info
1375 tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
1377 tcp_main_t *tm = vnet_get_tcp_main ();
1378 vlib_main_t *vm = vlib_get_main ();
1379 u32 n_written = 0, offset = 0, bi, old_snd_nxt;
1383 ASSERT (tcp_in_fastrecovery (tc));
1384 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1386 /* Start resending from first un-acked segment */
1387 old_snd_nxt = tc->snd_nxt;
1388 tc->snd_nxt = tc->snd_una;
1389 snd_space = tcp_available_snd_space (tc);
1391 while (snd_space > 0)
1393 tcp_get_free_buffer_index (tm, &bi);
1394 b = vlib_get_buffer (vm, bi);
1396 offset += n_written;
1397 n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
1399 /* Nothing left to retransmit */
1402 tcp_return_buffer (tm);
1406 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1407 snd_space -= n_written;
1410 /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
1411 tc->snd_nxt = old_snd_nxt;
1415 * Do fast retransmit
1418 tcp_fast_retransmit (tcp_connection_t * tc)
1420 if (tcp_opts_sack_permitted (&tc->rcv_opts)
1421 && scoreboard_first_hole (&tc->sack_sb))
1422 tcp_fast_retransmit_sack (tc);
1424 tcp_fast_retransmit_no_sack (tc);
1428 tcp_session_has_ooo_data (tcp_connection_t * tc)
1430 stream_session_t *s =
1431 stream_session_get (tc->c_s_index, tc->c_thread_index);
1432 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1436 tcp46_output_inline (vlib_main_t * vm,
1437 vlib_node_runtime_t * node,
1438 vlib_frame_t * from_frame, int is_ip4)
1440 u32 n_left_from, next_index, *from, *to_next;
1441 u32 my_thread_index = vm->thread_index;
1443 from = vlib_frame_vector_args (from_frame);
1444 n_left_from = from_frame->n_vectors;
1446 next_index = node->cached_next_index;
1448 while (n_left_from > 0)
1452 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1454 while (n_left_from > 0 && n_left_to_next > 0)
1458 tcp_connection_t *tc0;
1460 tcp_header_t *th0 = 0;
1461 u32 error0 = TCP_ERROR_PKTS_SENT, next0 = TCP_OUTPUT_NEXT_IP_LOOKUP;
1468 n_left_to_next -= 1;
1470 b0 = vlib_get_buffer (vm, bi0);
1471 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1473 if (PREDICT_FALSE (tc0 == 0 || tc0->state == TCP_STATE_CLOSED))
1475 error0 = TCP_ERROR_INVALID_CONNECTION;
1476 next0 = TCP_OUTPUT_NEXT_DROP;
1480 th0 = vlib_buffer_get_current (b0);
1481 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1486 ih0 = vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4,
1487 &tc0->c_rmt_ip4, IP_PROTOCOL_TCP);
1488 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih0);
1495 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1496 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1497 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih0,
1502 /* Filter out DUPACKs if there are no OOO segments left */
1504 (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1506 if (!tcp_session_has_ooo_data (tc0))
1508 error0 = TCP_ERROR_FILTERED_DUPACKS;
1509 next0 = TCP_OUTPUT_NEXT_DROP;
1514 /* Stop DELACK timer and fix flags */
1515 tc0->flags &= ~(TCP_CONN_SNDACK);
1516 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
1518 /* If not retransmitting
1519 * 1) update snd_una_max (SYN, SYNACK, FIN)
1520 * 2) If we're not tracking an ACK, start tracking */
1521 if (seq_lt (tc0->snd_una_max, tc0->snd_nxt))
1523 tc0->snd_una_max = tc0->snd_nxt;
1524 if (tc0->rtt_ts == 0)
1526 tc0->rtt_ts = tcp_time_now ();
1527 tc0->rtt_seq = tc0->snd_nxt;
1531 /* Set the retransmit timer if not set already and not
1532 * doing a pure ACK */
1533 if (!tcp_timer_is_active (tc0, TCP_TIMER_RETRANSMIT)
1534 && tc0->snd_nxt != tc0->snd_una)
1536 tcp_retransmit_timer_set (tc0);
1541 /* Make sure we haven't lost route to our peer */
1542 if (PREDICT_FALSE (tc0->last_fib_check
1543 < tc0->snd_opts.tsval + TCP_FIB_RECHECK_PERIOD))
1546 (tc0->c_rmt_fei == tcp_lookup_rmt_in_fib (tc0)))
1548 tc0->last_fib_check = tc0->snd_opts.tsval;
1552 clib_warning ("lost connection to peer");
1553 tcp_connection_reset (tc0);
1558 /* Use pre-computed dpo to set next node */
1559 next0 = tc0->c_rmt_dpo.dpoi_next_node;
1560 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = tc0->c_rmt_dpo.dpoi_index;
1563 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
1564 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1566 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1568 b0->error = node->errors[error0];
1569 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1571 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1574 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1578 memset (&t0->tcp_header, 0, sizeof (t0->tcp_header));
1580 clib_memcpy (&t0->tcp_connection, tc0,
1581 sizeof (t0->tcp_connection));
1584 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1585 n_left_to_next, bi0, next0);
1588 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1591 return from_frame->n_vectors;
1595 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1596 vlib_frame_t * from_frame)
1598 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1602 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1603 vlib_frame_t * from_frame)
1605 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1609 VLIB_REGISTER_NODE (tcp4_output_node) =
1611 .function = tcp4_output,.name = "tcp4-output",
1612 /* Takes a vector of packets. */
1613 .vector_size = sizeof (u32),
1614 .n_errors = TCP_N_ERROR,
1615 .error_strings = tcp_error_strings,
1616 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1618 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1619 foreach_tcp4_output_next
1622 .format_buffer = format_tcp_header,
1623 .format_trace = format_tcp_tx_trace,
1627 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
1630 VLIB_REGISTER_NODE (tcp6_output_node) =
1632 .function = tcp6_output,
1633 .name = "tcp6-output",
1634 /* Takes a vector of packets. */
1635 .vector_size = sizeof (u32),
1636 .n_errors = TCP_N_ERROR,
1637 .error_strings = tcp_error_strings,
1638 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1640 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1641 foreach_tcp6_output_next
1644 .format_buffer = format_tcp_header,
1645 .format_trace = format_tcp_tx_trace,
1649 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
1652 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1654 tcp_connection_t *tc;
1656 tc = (tcp_connection_t *) tconn;
1657 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0);
1659 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1661 tc->rtt_ts = tcp_time_now ();
1662 tc->rtt_seq = tc->snd_nxt;
1667 typedef enum _tcp_reset_next
1669 TCP_RESET_NEXT_DROP,
1670 TCP_RESET_NEXT_IP_LOOKUP,
1674 #define foreach_tcp4_reset_next \
1675 _(DROP, "error-drop") \
1676 _(IP_LOOKUP, "ip4-lookup")
1678 #define foreach_tcp6_reset_next \
1679 _(DROP, "error-drop") \
1680 _(IP_LOOKUP, "ip6-lookup")
1683 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1684 vlib_frame_t * from_frame, u8 is_ip4)
1686 u32 n_left_from, next_index, *from, *to_next;
1687 u32 my_thread_index = vm->thread_index;
1689 from = vlib_frame_vector_args (from_frame);
1690 n_left_from = from_frame->n_vectors;
1692 next_index = node->cached_next_index;
1694 while (n_left_from > 0)
1698 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1700 while (n_left_from > 0 && n_left_to_next > 0)
1706 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
1713 n_left_to_next -= 1;
1715 b0 = vlib_get_buffer (vm, bi0);
1717 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
1718 my_thread_index, is_ip4))
1720 error0 = TCP_ERROR_LOOKUP_DROPS;
1721 next0 = TCP_RESET_NEXT_DROP;
1725 /* Prepare to send to IP lookup */
1726 vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0;
1727 next0 = TCP_RESET_NEXT_IP_LOOKUP;
1730 b0->error = node->errors[error0];
1731 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
1732 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1734 th0 = vlib_buffer_get_current (b0);
1736 th0 = ip4_next_header ((ip4_header_t *) th0);
1738 th0 = ip6_next_header ((ip6_header_t *) th0);
1739 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1740 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1743 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1744 n_left_to_next, bi0, next0);
1746 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1748 return from_frame->n_vectors;
1752 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1753 vlib_frame_t * from_frame)
1755 return tcp46_send_reset_inline (vm, node, from_frame, 1);
1759 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1760 vlib_frame_t * from_frame)
1762 return tcp46_send_reset_inline (vm, node, from_frame, 0);
1766 VLIB_REGISTER_NODE (tcp4_reset_node) = {
1767 .function = tcp4_send_reset,
1768 .name = "tcp4-reset",
1769 .vector_size = sizeof (u32),
1770 .n_errors = TCP_N_ERROR,
1771 .error_strings = tcp_error_strings,
1772 .n_next_nodes = TCP_RESET_N_NEXT,
1774 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1775 foreach_tcp4_reset_next
1778 .format_trace = format_tcp_tx_trace,
1782 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
1785 VLIB_REGISTER_NODE (tcp6_reset_node) = {
1786 .function = tcp6_send_reset,
1787 .name = "tcp6-reset",
1788 .vector_size = sizeof (u32),
1789 .n_errors = TCP_N_ERROR,
1790 .error_strings = tcp_error_strings,
1791 .n_next_nodes = TCP_RESET_N_NEXT,
1793 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1794 foreach_tcp6_reset_next
1797 .format_trace = format_tcp_tx_trace,
1801 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
1804 * fd.io coding-style-patch-verification: ON
1807 * eval: (c-set-style "gnu")