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>
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,
26 TCP_OUTPUT_NEXT_IP_REWRITE,
27 TCP_OUTPUT_NEXT_IP_ARP,
31 #define foreach_tcp4_output_next \
32 _ (DROP, "error-drop") \
33 _ (IP_LOOKUP, "ip4-lookup") \
34 _ (IP_REWRITE, "ip4-rewrite") \
37 #define foreach_tcp6_output_next \
38 _ (DROP, "error-drop") \
39 _ (IP_LOOKUP, "ip6-lookup") \
40 _ (IP_REWRITE, "ip6-rewrite") \
41 _ (IP_ARP, "ip6-discover-neighbor")
43 static char *tcp_error_strings[] = {
44 #define tcp_error(n,s) s,
45 #include <vnet/tcp/tcp_error.def>
51 tcp_header_t tcp_header;
52 tcp_connection_t tcp_connection;
58 format_tcp_tx_trace (u8 * s, va_list * args)
60 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
63 u32 indent = format_get_indent (s);
65 s = format (s, "%U\n%U%U",
66 format_tcp_header, &t->tcp_header, 128,
67 format_white_space, indent,
68 format_tcp_connection, &t->tcp_connection, 1);
74 tcp_window_compute_scale (u32 window)
77 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
83 * Update max segment size we're able to process.
85 * The value is constrained by our interface's MTU and IP options. It is
86 * also what we advertise to our peer.
89 tcp_update_rcv_mss (tcp_connection_t * tc)
91 /* TODO find our iface MTU */
92 tc->mss = dummy_mtu - sizeof (tcp_header_t);
96 * TCP's initial window
99 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
101 /* RFC 6928 recommends the value lower. However at the time our connections
102 * are initialized, fifos may not be allocated. Therefore, advertise the
103 * smallest possible unscaled window size and update once fifos are
104 * assigned to the session.
107 tcp_update_rcv_mss (tc);
108 TCP_IW_N_SEGMENTS * tc->mss;
110 return TCP_MIN_RX_FIFO_SIZE;
114 * Compute initial window and scale factor. As per RFC1323, window field in
115 * SYN and SYN-ACK segments is never scaled.
118 tcp_initial_window_to_advertise (tcp_connection_t * tc)
120 tcp_main_t *tm = &tcp_main;
123 /* Initial wnd for SYN. Fifos are not allocated yet.
124 * Use some predefined value. For SYN-ACK we still want the
125 * scale to be computed in the same way */
126 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
128 /* Compute rcv wscale only if peer advertised support for it */
129 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
130 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
132 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
134 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
138 tcp_update_rcv_wnd (tcp_connection_t * tc)
141 u32 available_space, max_fifo, wnd;
144 * Figure out how much space we have available
146 available_space = transport_max_rx_enqueue (&tc->connection);
147 max_fifo = transport_rx_fifo_size (&tc->connection);
149 ASSERT (tc->rcv_opts.mss < max_fifo);
150 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
154 * Use the above and what we know about what we've previously advertised
155 * to compute the new window
157 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
158 if (observed_wnd < 0)
161 /* Bad. Thou shalt not shrink */
162 if (available_space < observed_wnd)
165 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
169 wnd = available_space;
172 /* Make sure we have a multiple of rcv_wscale */
173 if (wnd && tc->rcv_wscale)
175 wnd &= ~(1 << tc->rcv_wscale);
177 wnd = 1 << tc->rcv_wscale;
180 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
184 * Compute and return window to advertise, scaled as per RFC1323
187 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
189 if (state < TCP_STATE_ESTABLISHED)
190 return tcp_initial_window_to_advertise (tc);
192 tcp_update_rcv_wnd (tc);
194 if (tc->rcv_wnd == 0)
196 tc->flags |= TCP_CONN_SENT_RCV_WND0;
200 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
203 return tc->rcv_wnd >> tc->rcv_wscale;
207 * Write TCP options to segment.
210 tcp_options_write (u8 * data, tcp_options_t * opts)
213 u32 buf, seq_len = 4;
215 if (tcp_opts_mss (opts))
217 *data++ = TCP_OPTION_MSS;
218 *data++ = TCP_OPTION_LEN_MSS;
219 buf = clib_host_to_net_u16 (opts->mss);
220 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
221 data += sizeof (opts->mss);
222 opts_len += TCP_OPTION_LEN_MSS;
225 if (tcp_opts_wscale (opts))
227 *data++ = TCP_OPTION_WINDOW_SCALE;
228 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
229 *data++ = opts->wscale;
230 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
233 if (tcp_opts_sack_permitted (opts))
235 *data++ = TCP_OPTION_SACK_PERMITTED;
236 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
237 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
240 if (tcp_opts_tstamp (opts))
242 *data++ = TCP_OPTION_TIMESTAMP;
243 *data++ = TCP_OPTION_LEN_TIMESTAMP;
244 buf = clib_host_to_net_u32 (opts->tsval);
245 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
246 data += sizeof (opts->tsval);
247 buf = clib_host_to_net_u32 (opts->tsecr);
248 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
249 data += sizeof (opts->tsecr);
250 opts_len += TCP_OPTION_LEN_TIMESTAMP;
253 if (tcp_opts_sack (opts))
256 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
257 TCP_OPTS_MAX_SACK_BLOCKS);
259 if (n_sack_blocks != 0)
261 *data++ = TCP_OPTION_SACK_BLOCK;
262 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
263 for (i = 0; i < n_sack_blocks; i++)
265 buf = clib_host_to_net_u32 (opts->sacks[i].start);
266 clib_memcpy_fast (data, &buf, seq_len);
268 buf = clib_host_to_net_u32 (opts->sacks[i].end);
269 clib_memcpy_fast (data, &buf, seq_len);
272 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
276 /* Terminate TCP options */
279 *data++ = TCP_OPTION_EOL;
280 opts_len += TCP_OPTION_LEN_EOL;
283 /* Pad with zeroes to a u32 boundary */
286 *data++ = TCP_OPTION_NOOP;
287 opts_len += TCP_OPTION_LEN_NOOP;
293 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
297 opts->flags |= TCP_OPTS_FLAG_MSS;
298 opts->mss = dummy_mtu; /*XXX discover that */
299 len += TCP_OPTION_LEN_MSS;
301 opts->flags |= TCP_OPTS_FLAG_WSCALE;
302 opts->wscale = wnd_scale;
303 len += TCP_OPTION_LEN_WINDOW_SCALE;
305 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
306 opts->tsval = tcp_time_now ();
308 len += TCP_OPTION_LEN_TIMESTAMP;
312 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
313 len += TCP_OPTION_LEN_SACK_PERMITTED;
316 /* Align to needed boundary */
317 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
322 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
326 opts->flags |= TCP_OPTS_FLAG_MSS;
328 len += TCP_OPTION_LEN_MSS;
330 if (tcp_opts_wscale (&tc->rcv_opts))
332 opts->flags |= TCP_OPTS_FLAG_WSCALE;
333 opts->wscale = tc->rcv_wscale;
334 len += TCP_OPTION_LEN_WINDOW_SCALE;
337 if (tcp_opts_tstamp (&tc->rcv_opts))
339 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
340 opts->tsval = tcp_time_now ();
341 opts->tsecr = tc->tsval_recent;
342 len += TCP_OPTION_LEN_TIMESTAMP;
345 if (tcp_opts_sack_permitted (&tc->rcv_opts))
347 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
348 len += TCP_OPTION_LEN_SACK_PERMITTED;
351 /* Align to needed boundary */
352 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
357 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
363 if (tcp_opts_tstamp (&tc->rcv_opts))
365 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
366 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
367 opts->tsecr = tc->tsval_recent;
368 len += TCP_OPTION_LEN_TIMESTAMP;
370 if (tcp_opts_sack_permitted (&tc->rcv_opts))
372 if (vec_len (tc->snd_sacks))
374 opts->flags |= TCP_OPTS_FLAG_SACK;
375 opts->sacks = tc->snd_sacks;
376 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
377 TCP_OPTS_MAX_SACK_BLOCKS);
378 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
382 /* Align to needed boundary */
383 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
388 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
393 case TCP_STATE_ESTABLISHED:
394 case TCP_STATE_CLOSE_WAIT:
395 case TCP_STATE_FIN_WAIT_1:
396 case TCP_STATE_LAST_ACK:
397 case TCP_STATE_CLOSING:
398 case TCP_STATE_FIN_WAIT_2:
399 case TCP_STATE_TIME_WAIT:
400 case TCP_STATE_CLOSED:
401 return tcp_make_established_options (tc, opts);
402 case TCP_STATE_SYN_RCVD:
403 return tcp_make_synack_options (tc, opts);
404 case TCP_STATE_SYN_SENT:
405 return tcp_make_syn_options (opts, tc->rcv_wscale);
407 clib_warning ("State not handled! %d", state);
413 * Update burst send vars
415 * - Updates snd_mss to reflect the effective segment size that we can send
416 * by taking into account all TCP options, including SACKs.
417 * - Cache 'on the wire' options for reuse
418 * - Updates receive window which can be reused for a burst.
420 * This should *only* be called when doing bursts
423 tcp_update_burst_snd_vars (tcp_connection_t * tc)
425 tcp_main_t *tm = &tcp_main;
427 /* Compute options to be used for connection. These may be reused when
428 * sending data or to compute the effective mss (snd_mss) */
429 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
430 TCP_STATE_ESTABLISHED);
432 /* XXX check if MTU has been updated */
433 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
434 ASSERT (tc->snd_mss > 0);
436 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
439 tcp_update_rcv_wnd (tc);
443 tcp_init_mss (tcp_connection_t * tc)
445 u16 default_min_mss = 536;
446 tcp_update_rcv_mss (tc);
448 /* TODO cache mss and consider PMTU discovery */
449 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
451 if (tc->snd_mss < 45)
453 /* Assume that at least the min default mss works */
454 tc->snd_mss = default_min_mss;
455 tc->rcv_opts.mss = default_min_mss;
458 /* We should have enough space for 40 bytes of options */
459 ASSERT (tc->snd_mss > 45);
461 /* If we use timestamp option, account for it */
462 if (tcp_opts_tstamp (&tc->rcv_opts))
463 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
467 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
469 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
470 vlib_buffer_free_one (vm, b->next_buffer);
471 /* Zero all flags but free list index and trace flag */
472 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
474 b->current_length = 0;
475 b->total_length_not_including_first_buffer = 0;
476 vnet_buffer (b)->tcp.flags = 0;
478 /* Leave enough space for headers */
479 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
483 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
485 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
486 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
487 b->total_length_not_including_first_buffer = 0;
489 vnet_buffer (b)->tcp.flags = 0;
490 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
491 /* Leave enough space for headers */
492 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
499 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
502 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
503 u8 tcp_opts_len, tcp_hdr_opts_len;
507 wnd = tcp_window_to_advertise (tc, state);
509 /* Make and write options */
510 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
511 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
513 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
514 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
516 tcp_options_write ((u8 *) (th + 1), snd_opts);
517 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
521 * Convert buffer to ACK
524 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
526 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
527 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
528 tc->rcv_las = tc->rcv_nxt;
532 * Convert buffer to FIN-ACK
535 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
537 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
539 /* Reset flags, make sure ack is sent */
540 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
544 * Convert buffer to SYN
547 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
549 u8 tcp_hdr_opts_len, tcp_opts_len;
552 tcp_options_t snd_opts;
554 initial_wnd = tcp_initial_window_to_advertise (tc);
556 /* Make and write options */
557 clib_memset (&snd_opts, 0, sizeof (snd_opts));
558 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
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, TCP_FLAG_SYN,
564 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
565 tcp_options_write ((u8 *) (th + 1), &snd_opts);
569 * Convert buffer to SYN-ACK
572 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
574 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
575 u8 tcp_opts_len, tcp_hdr_opts_len;
579 clib_memset (snd_opts, 0, sizeof (*snd_opts));
580 initial_wnd = tcp_initial_window_to_advertise (tc);
581 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
582 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
584 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
585 tc->rcv_nxt, tcp_hdr_opts_len,
586 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
587 tcp_options_write ((u8 *) (th + 1), snd_opts);
589 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
591 /* Init retransmit timer. Use update instead of set because of
593 tcp_retransmit_timer_force_update (tc);
594 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
598 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
599 u8 is_ip4, u32 fib_index, u8 flush)
601 vlib_main_t *vm = wrk->vm;
602 u32 *to_next, next_index;
605 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
608 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
609 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
611 /* Send to IP lookup */
612 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
613 tcp_trajectory_add_start (b, 1);
615 f = wrk->ip_lookup_tx_frames[!is_ip4];
618 f = vlib_get_frame_to_node (vm, next_index);
620 wrk->ip_lookup_tx_frames[!is_ip4] = f;
623 to_next = vlib_frame_vector_args (f);
624 to_next[f->n_vectors] = bi;
626 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
628 vlib_put_frame_to_node (vm, next_index, f);
629 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
634 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
635 u32 bi, u8 is_ip4, u32 fib_index)
637 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
641 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
642 u8 is_ip4, u32 fib_index)
644 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
645 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
646 session_flush_frames_main_thread (wrk->vm);
650 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
653 u32 *to_next, next_index;
656 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
659 /* Decide where to send the packet */
660 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
661 tcp_trajectory_add_start (b, 2);
663 /* Get frame to v4/6 output node */
664 f = wrk->tx_frames[!is_ip4];
667 f = vlib_get_frame_to_node (wrk->vm, next_index);
669 wrk->tx_frames[!is_ip4] = f;
671 to_next = vlib_frame_vector_args (f);
672 to_next[f->n_vectors] = bi;
674 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
676 vlib_put_frame_to_node (wrk->vm, next_index, f);
677 wrk->tx_frames[!is_ip4] = 0;
682 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
685 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
689 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
692 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
696 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
697 tcp_state_t state, u8 thread_index, u8 is_ip4)
702 ip4_address_t src_ip40, dst_ip40;
703 ip6_address_t src_ip60, dst_ip60;
704 u16 src_port, dst_port;
709 /* Find IP and TCP headers */
710 th0 = tcp_buffer_hdr (b0);
712 /* Save src and dst ip */
715 ih4 = vlib_buffer_get_current (b0);
716 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
717 src_ip40.as_u32 = ih4->src_address.as_u32;
718 dst_ip40.as_u32 = ih4->dst_address.as_u32;
722 ih6 = vlib_buffer_get_current (b0);
723 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
724 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
725 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
728 src_port = th0->src_port;
729 dst_port = th0->dst_port;
731 /* Try to determine what/why we're actually resetting */
732 if (state == TCP_STATE_CLOSED)
737 tmp = clib_net_to_host_u32 (th0->seq_number);
739 /* Got a SYN for no listener. */
740 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
741 ack = clib_host_to_net_u32 (tmp + 1);
746 flags = TCP_FLAG_RST;
747 seq = th0->ack_number;
751 tcp_reuse_buffer (vm, b0);
752 tcp_trajectory_add_start (b0, 4);
753 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
754 sizeof (tcp_header_t), flags, 0);
758 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
760 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
765 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
767 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
775 * Send reset without reusing existing buffer
777 * It extracts connection info out of original packet
780 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
781 u32 thread_index, u8 is_ip4)
783 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
784 vlib_main_t *vm = wrk->vm;
786 u32 bi, sw_if_index, fib_index;
787 u8 tcp_hdr_len, flags = 0;
788 tcp_header_t *th, *pkt_th;
790 ip4_header_t *ih4, *pkt_ih4;
791 ip6_header_t *ih6, *pkt_ih6;
792 fib_protocol_t fib_proto;
794 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
797 b = vlib_get_buffer (vm, bi);
798 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
799 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
800 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
801 tcp_init_buffer (vm, b);
803 /* Make and write options */
804 tcp_hdr_len = sizeof (tcp_header_t);
808 pkt_ih4 = vlib_buffer_get_current (pkt);
809 pkt_th = ip4_next_header (pkt_ih4);
813 pkt_ih6 = vlib_buffer_get_current (pkt);
814 pkt_th = ip6_next_header (pkt_ih6);
817 if (tcp_ack (pkt_th))
819 flags = TCP_FLAG_RST;
820 seq = pkt_th->ack_number;
821 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
825 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
827 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
830 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
831 seq, ack, tcp_hdr_len, flags, 0);
833 /* Swap src and dst ip */
836 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
837 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
838 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
839 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
844 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
846 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
847 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
848 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
852 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
853 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
857 * Build and set reset packet for connection
860 tcp_send_reset (tcp_connection_t * tc)
862 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
863 vlib_main_t *vm = wrk->vm;
867 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
870 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
872 b = vlib_get_buffer (vm, bi);
873 tcp_init_buffer (vm, b);
875 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
876 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
877 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
878 flags = TCP_FLAG_RST;
879 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
880 tc->rcv_nxt, tcp_hdr_opts_len, flags,
882 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
883 ASSERT (opts_write_len == tc->snd_opts_len);
884 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
888 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
889 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
890 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
896 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
897 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
898 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
901 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
902 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
906 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
909 tcp_header_t *th = vlib_buffer_get_current (b);
910 vlib_main_t *vm = wrk->vm;
914 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
915 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
916 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
923 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
924 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
925 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
933 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
934 * The packet is not forwarded through tcpx_output to avoid doing lookups
935 * in the half_open pool.
938 tcp_send_syn (tcp_connection_t * tc)
940 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
941 vlib_main_t *vm = wrk->vm;
946 * Setup retransmit and establish timers before requesting buffer
947 * such that we can return if we've ran out.
949 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
950 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
951 tc->rto * TCP_TO_TIMER_TICK);
953 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
956 b = vlib_get_buffer (vm, bi);
957 tcp_init_buffer (vm, b);
958 tcp_make_syn (tc, b);
960 /* Measure RTT with this */
961 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
962 tc->rtt_seq = tc->snd_nxt;
965 tcp_push_ip_hdr (wrk, tc, b);
966 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
967 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
971 tcp_send_synack (tcp_connection_t * tc)
973 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
974 vlib_main_t *vm = wrk->vm;
978 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
981 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
982 b = vlib_get_buffer (vm, bi);
983 tcp_init_buffer (vm, b);
984 tcp_make_synack (tc, b);
985 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
989 * Flush tx frame populated by retransmits and timer pops
992 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
994 if (wrk->tx_frames[!is_ip4])
997 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
998 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
999 wrk->tx_frames[!is_ip4] = 0;
1004 * Flush ip lookup tx frames populated by timer pops
1007 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1009 if (wrk->ip_lookup_tx_frames[!is_ip4])
1012 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1013 vlib_put_frame_to_node (wrk->vm, next_index,
1014 wrk->ip_lookup_tx_frames[!is_ip4]);
1015 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1020 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1023 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1025 tcp_flush_frame_to_output (wrk, 1);
1026 tcp_flush_frame_to_output (wrk, 0);
1027 tcp_flush_frame_to_ip_lookup (wrk, 1);
1028 tcp_flush_frame_to_ip_lookup (wrk, 0);
1035 tcp_send_fin (tcp_connection_t * tc)
1037 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1038 vlib_main_t *vm = wrk->vm;
1043 fin_snt = tc->flags & TCP_CONN_FINSNT;
1045 tc->snd_nxt = tc->snd_una;
1047 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1049 /* Out of buffers so program fin retransmit ASAP */
1050 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1052 tc->snd_nxt = tc->snd_una_max;
1056 tcp_retransmit_timer_force_update (tc);
1057 b = vlib_get_buffer (vm, bi);
1058 tcp_init_buffer (vm, b);
1059 tcp_make_fin (tc, b);
1060 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1061 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1065 tc->flags |= TCP_CONN_FINSNT;
1066 tc->flags &= ~TCP_CONN_FINPNDG;
1067 /* Account for the FIN */
1068 tc->snd_una_max += 1;
1069 tc->snd_nxt = tc->snd_una_max;
1073 tc->snd_nxt = tc->snd_una_max;
1078 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1082 case TCP_STATE_ESTABLISHED:
1083 case TCP_STATE_CLOSE_WAIT:
1084 case TCP_STATE_TIME_WAIT:
1085 case TCP_STATE_FIN_WAIT_2:
1086 return TCP_FLAG_ACK;
1087 case TCP_STATE_SYN_RCVD:
1088 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1089 case TCP_STATE_SYN_SENT:
1090 return TCP_FLAG_SYN;
1091 case TCP_STATE_LAST_ACK:
1092 case TCP_STATE_FIN_WAIT_1:
1093 case TCP_STATE_CLOSING:
1094 if (tc->snd_nxt + 1 < tc->snd_una_max)
1095 return TCP_FLAG_ACK;
1097 return TCP_FLAG_FIN;
1099 clib_warning ("Shouldn't be here!");
1105 * Push TCP header and update connection variables
1108 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1109 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1111 u32 advertise_wnd, data_len;
1112 u8 tcp_hdr_opts_len, flags;
1113 tcp_main_t *tm = &tcp_main;
1116 data_len = b->current_length;
1117 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1118 data_len += b->total_length_not_including_first_buffer;
1120 vnet_buffer (b)->tcp.flags = 0;
1121 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1124 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1126 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1129 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1131 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1133 flags = tcp_make_state_flags (tc, next_state);
1134 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1136 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1137 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1138 flags |= TCP_FLAG_PSH;
1140 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1141 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1146 clib_memcpy_fast ((u8 *) (th + 1),
1147 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1152 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1153 ASSERT (len == tc->snd_opts_len);
1157 * Update connection variables
1160 tc->snd_nxt += data_len;
1161 tc->rcv_las = tc->rcv_nxt;
1163 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1167 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1169 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1171 tc->snd_una_max = tc->snd_nxt;
1172 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1173 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1174 /* If not tracking an ACK, start tracking */
1175 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1177 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1178 tc->rtt_seq = tc->snd_nxt;
1180 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1182 tcp_retransmit_timer_set (tc);
1185 tcp_trajectory_add_start (b, 3);
1190 tcp_send_ack (tcp_connection_t * tc)
1192 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1193 vlib_main_t *vm = wrk->vm;
1197 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1199 b = vlib_get_buffer (vm, bi);
1200 tcp_init_buffer (vm, b);
1201 tcp_make_ack (tc, b);
1202 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1206 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1208 if (!(tc->flags & TCP_CONN_SNDACK))
1210 vec_add1 (wrk->pending_acks, tc->c_c_index);
1211 tc->flags |= TCP_CONN_SNDACK;
1216 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1218 if (!(tc->flags & TCP_CONN_SNDACK))
1220 vec_add1 (wrk->pending_acks, tc->c_c_index);
1221 tc->flags |= TCP_CONN_SNDACK;
1223 if (tc->pending_dupacks < 255)
1224 tc->pending_dupacks += 1;
1228 tcp_send_acks (tcp_worker_ctx_t * wrk)
1230 u32 thread_index, *pending_acks;
1231 tcp_connection_t *tc;
1234 if (!vec_len (wrk->pending_acks))
1237 thread_index = wrk->vm->thread_index;
1238 pending_acks = wrk->pending_acks;
1239 for (i = 0; i < vec_len (pending_acks); i++)
1241 tc = tcp_connection_get (pending_acks[i], thread_index);
1242 tc->flags &= ~TCP_CONN_SNDACK;
1243 n_acks = clib_max (1, tc->pending_dupacks);
1244 /* If we're supposed to send dupacks but have no ooo data
1245 * send only one ack */
1246 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1248 for (j = 0; j < n_acks; j++)
1250 tc->pending_dupacks = 0;
1252 _vec_len (wrk->pending_acks) = 0;
1256 * Delayed ack timer handler
1258 * Sends delayed ACK when timer expires
1261 tcp_timer_delack_handler (u32 index)
1263 u32 thread_index = vlib_get_thread_index ();
1264 tcp_connection_t *tc;
1266 tc = tcp_connection_get (index, thread_index);
1267 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1272 * Allocate a new buffer and build a new tcp segment
1274 * @param wrk tcp worker
1275 * @param tc connection for which the segment will be allocated
1276 * @param offset offset of the first byte in the tx fifo
1277 * @param max_deq_byte segment size
1278 * @param[out] b pointer to buffer allocated
1280 * @return the number of bytes in the segment or 0 if buffer cannot be
1281 * allocated or no data available
1284 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1285 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1287 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1288 vlib_main_t *vm = wrk->vm;
1293 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1298 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1301 * Allocate and fill in buffer(s)
1304 /* Easy case, buffer size greater than mss */
1305 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1307 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1309 *b = vlib_get_buffer (vm, bi);
1310 data = tcp_init_buffer (vm, *b);
1311 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1313 ASSERT (n_bytes == max_deq_bytes);
1314 b[0]->current_length = n_bytes;
1315 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1316 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1317 tc->snd_una_max = tc->snd_nxt;
1319 /* Split mss into multiple buffers */
1322 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1323 u16 n_peeked, len_to_deq;
1324 vlib_buffer_t *chain_b, *prev_b;
1327 /* Make sure we have enough buffers */
1328 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1329 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1330 CLIB_CACHE_LINE_BYTES);
1331 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1332 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1335 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1339 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1340 data = tcp_init_buffer (vm, *b);
1341 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1343 TRANSPORT_MAX_HDRS_LEN);
1344 b[0]->current_length = n_bytes;
1345 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1346 b[0]->total_length_not_including_first_buffer = 0;
1347 max_deq_bytes -= n_bytes;
1350 for (i = 1; i < n_bufs_per_seg; i++)
1353 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1354 chain_bi = wrk->tx_buffers[--n_bufs];
1355 chain_b = vlib_get_buffer (vm, chain_bi);
1356 chain_b->current_data = 0;
1357 data = vlib_buffer_get_current (chain_b);
1358 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1359 offset + n_bytes, len_to_deq);
1360 ASSERT (n_peeked == len_to_deq);
1361 n_bytes += n_peeked;
1362 chain_b->current_length = n_peeked;
1363 chain_b->next_buffer = 0;
1365 /* update previous buffer */
1366 prev_b->next_buffer = chain_bi;
1367 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1369 max_deq_bytes -= n_peeked;
1370 b[0]->total_length_not_including_first_buffer += n_peeked;
1373 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1374 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1375 tc->snd_una_max = tc->snd_nxt;
1377 if (PREDICT_FALSE (n_bufs))
1379 clib_warning ("not all buffers consumed");
1380 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1384 ASSERT (n_bytes > 0);
1385 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1391 * Build a retransmit segment
1393 * @return the number of bytes in the segment or 0 if there's nothing to
1397 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1398 tcp_connection_t * tc, u32 offset,
1399 u32 max_deq_bytes, vlib_buffer_t ** b)
1401 u32 start, available_bytes;
1404 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1405 ASSERT (max_deq_bytes != 0);
1408 * Make sure we can retransmit something
1410 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1411 ASSERT (available_bytes >= offset);
1412 available_bytes -= offset;
1413 if (!available_bytes)
1416 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1417 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1419 /* Start is beyond snd_congestion */
1420 start = tc->snd_una + offset;
1421 if (seq_geq (start, tc->snd_congestion))
1424 /* Don't overshoot snd_congestion */
1425 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1427 max_deq_bytes = tc->snd_congestion - start;
1428 if (max_deq_bytes == 0)
1432 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1436 if (tcp_in_fastrecovery (tc))
1437 tc->snd_rxt_bytes += n_bytes;
1440 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1445 * Reset congestion control, switch cwnd to loss window and try again.
1448 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1450 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1451 tc->prev_ssthresh = tc->ssthresh;
1452 tc->prev_cwnd = tc->cwnd;
1454 /* Cleanly recover cc (also clears up fast retransmit) */
1455 if (tcp_in_fastrecovery (tc))
1457 /* TODO be less aggressive about this */
1458 scoreboard_clear (&tc->sack_sb);
1459 tcp_cc_fastrecovery_exit (tc);
1462 /* Start again from the beginning */
1463 tc->cc_algo->congestion (tc);
1464 tc->cwnd = tcp_loss_wnd (tc);
1465 tc->snd_congestion = tc->snd_una_max;
1467 tc->cwnd_acc_bytes = 0;
1468 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1469 tcp_recovery_on (tc);
1473 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1475 u32 thread_index = vlib_get_thread_index ();
1476 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1477 vlib_main_t *vm = wrk->vm;
1478 tcp_connection_t *tc;
1479 vlib_buffer_t *b = 0;
1484 tc = tcp_half_open_connection_get (index);
1485 /* Note: the connection may have transitioned to ESTABLISHED... */
1486 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1488 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1492 tc = tcp_connection_get (index, thread_index);
1493 /* Note: the connection may have been closed and pool_put */
1494 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1496 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1497 /* Wait-close and retransmit could pop at the same time */
1498 if (tc->state == TCP_STATE_CLOSED)
1502 if (tc->state >= TCP_STATE_ESTABLISHED)
1504 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1506 /* Lost FIN, retransmit and return */
1507 if (tcp_is_lost_fin (tc))
1511 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1515 /* Shouldn't be here. This condition is tricky because it has to take
1516 * into account boff > 0 due to persist timeout. */
1517 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1518 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1519 && !tcp_flight_size (tc)))
1521 ASSERT (!tcp_in_recovery (tc));
1526 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1527 * to persist timer timeout */
1528 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1531 tcp_update_rto (tc);
1534 /* Increment RTO backoff (also equal to number of retries) and go back
1535 * to first un-acked byte */
1538 /* First retransmit timeout */
1539 if (tc->rto_boff == 1)
1540 tcp_rxt_timeout_cc (tc);
1542 scoreboard_clear (&tc->sack_sb);
1544 /* If we've sent beyond snd_congestion, update it */
1545 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1546 tc->snd_congestion = tc->snd_una_max;
1548 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1549 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1551 /* Send one segment. Note that n_bytes may be zero due to buffer
1553 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1556 tcp_retransmit_timer_force_update (tc);
1560 bi = vlib_get_buffer_index (vm, b);
1562 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1563 if (tc->rto_boff == 1)
1564 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1566 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1567 tcp_retransmit_timer_force_update (tc);
1569 /* Retransmit for SYN */
1570 else if (tc->state == TCP_STATE_SYN_SENT)
1572 /* Half-open connection actually moved to established but we were
1573 * waiting for syn retransmit to pop to call cleanup from the right
1575 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1577 if (tcp_half_open_connection_cleanup (tc))
1578 TCP_DBG ("could not remove half-open connection");
1582 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1584 /* Try without increasing RTO a number of times. If this fails,
1585 * start growing RTO exponentially */
1587 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1588 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1590 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1591 tc->rto * TCP_TO_TIMER_TICK);
1593 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1596 b = vlib_get_buffer (vm, bi);
1597 tcp_init_buffer (vm, b);
1598 tcp_make_syn (tc, b);
1601 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1603 /* This goes straight to ipx_lookup. Retransmit timer set already */
1604 tcp_push_ip_hdr (wrk, tc, b);
1605 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1607 /* Retransmit SYN-ACK */
1608 else if (tc->state == TCP_STATE_SYN_RCVD)
1610 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1613 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1614 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1617 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1619 tcp_retransmit_timer_force_update (tc);
1623 b = vlib_get_buffer (vm, bi);
1624 tcp_init_buffer (vm, b);
1625 tcp_make_synack (tc, b);
1626 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1628 /* Retransmit timer already updated, just enqueue to output */
1629 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1633 ASSERT (tc->state == TCP_STATE_CLOSED);
1639 tcp_timer_retransmit_handler (u32 index)
1641 tcp_timer_retransmit_handler_i (index, 0);
1645 tcp_timer_retransmit_syn_handler (u32 index)
1647 tcp_timer_retransmit_handler_i (index, 1);
1651 * Got 0 snd_wnd from peer, try to do something about it.
1655 tcp_timer_persist_handler (u32 index)
1657 u32 thread_index = vlib_get_thread_index ();
1658 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1659 u32 bi, max_snd_bytes, available_bytes, offset;
1660 tcp_main_t *tm = vnet_get_tcp_main ();
1661 vlib_main_t *vm = wrk->vm;
1662 tcp_connection_t *tc;
1667 tc = tcp_connection_get_if_valid (index, thread_index);
1672 /* Make sure timer handle is set to invalid */
1673 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1675 /* Problem already solved or worse */
1676 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1677 || tc->snd_wnd > tc->snd_mss)
1680 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1681 offset = tc->snd_una_max - tc->snd_una;
1683 /* Reprogram persist if no new bytes available to send. We may have data
1685 if (!available_bytes)
1687 tcp_persist_timer_set (tc);
1691 if (available_bytes <= offset)
1693 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1697 /* Increment RTO backoff */
1699 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1702 * Try to force the first unsent segment (or buffer)
1704 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1706 tcp_persist_timer_set (tc);
1709 b = vlib_get_buffer (vm, bi);
1710 data = tcp_init_buffer (vm, b);
1712 tcp_validate_txf_size (tc, offset);
1713 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1715 clib_min (tc->snd_mss, tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1717 stream_session_peek_bytes (&tc->connection, data, offset, max_snd_bytes);
1718 b->current_length = n_bytes;
1719 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1720 || tc->snd_nxt == tc->snd_una_max
1721 || tc->rto_boff > 1));
1723 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1724 tc->snd_una_max = tc->snd_nxt;
1725 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1726 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1728 /* Just sent new data, enable retransmit */
1729 tcp_retransmit_timer_update (tc);
1733 * Retransmit first unacked segment
1736 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1738 u32 bi, old_snd_nxt, n_bytes;
1739 vlib_main_t *vm = wrk->vm;
1742 old_snd_nxt = tc->snd_nxt;
1743 tc->snd_nxt = tc->snd_una;
1745 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1747 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1751 bi = vlib_get_buffer_index (vm, b);
1752 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1753 tc->snd_nxt = old_snd_nxt;
1759 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1762 u32 offset, n_segs = 0, n_written, bi;
1763 vlib_main_t *vm = wrk->vm;
1764 vlib_buffer_t *b = 0;
1766 tc->snd_nxt = tc->snd_una_max;
1767 offset = tc->snd_una_max - tc->snd_una;
1768 while (n_segs < burst_size)
1770 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1774 bi = vlib_get_buffer_index (vm, b);
1775 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1776 offset += n_written;
1784 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1785 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1786 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1789 * Do fast retransmit with SACKs
1792 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1795 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1796 sack_scoreboard_hole_t *hole;
1797 vlib_main_t *vm = wrk->vm;
1798 vlib_buffer_t *b = 0;
1799 sack_scoreboard_t *sb;
1800 u32 bi, old_snd_nxt;
1803 u8 snd_limited = 0, can_rescue = 0;
1805 ASSERT (tcp_in_fastrecovery (tc));
1807 snd_space = tcp_available_cc_snd_space (tc);
1808 if (snd_space < tc->snd_mss)
1810 tcp_program_fastretransmit (wrk, tc);
1814 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1815 old_snd_nxt = tc->snd_nxt;
1817 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1819 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1820 max_deq -= tc->snd_una_max - tc->snd_una;
1822 while (snd_space > 0 && n_segs < burst_size)
1824 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1830 snd_space = clib_min (max_deq, snd_space);
1831 burst_size = clib_min (burst_size - n_segs,
1832 snd_space / tc->snd_mss);
1833 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1834 if (max_deq > n_segs_now * tc->snd_mss)
1835 tcp_program_fastretransmit (wrk, tc);
1836 n_segs += n_segs_now;
1840 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1843 /* If rescue rxt undefined or less than snd_una then one segment of
1844 * up to SMSS octets that MUST include the highest outstanding
1845 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1846 * RecoveryPoint. HighRxt MUST NOT be updated.
1848 max_bytes = clib_min (tc->snd_mss,
1849 tc->snd_congestion - tc->snd_una);
1850 max_bytes = clib_min (max_bytes, snd_space);
1851 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1852 sb->rescue_rxt = tc->snd_congestion;
1853 tc->snd_nxt = tc->snd_una + offset;
1854 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1859 bi = vlib_get_buffer_index (vm, b);
1860 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1865 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1866 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1870 offset = sb->high_rxt - tc->snd_una;
1871 tc->snd_nxt = sb->high_rxt;
1872 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1874 ASSERT (n_written <= snd_space);
1876 /* Nothing left to retransmit */
1880 bi = vlib_get_buffer_index (vm, b);
1881 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1883 sb->high_rxt += n_written;
1884 snd_space -= n_written;
1889 tcp_program_fastretransmit (wrk, tc);
1892 /* If window allows, send 1 SMSS of new data */
1893 tc->snd_nxt = old_snd_nxt;
1898 * Fast retransmit without SACK info
1901 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1904 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1905 vlib_main_t *vm = wrk->vm;
1906 int snd_space, n_segs = 0;
1909 ASSERT (tcp_in_fastrecovery (tc));
1910 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1911 old_snd_nxt = tc->snd_nxt;
1913 if (!tcp_fastrecovery_first (tc))
1916 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1918 snd_space = tc->sack_sb.last_bytes_delivered;
1919 tc->snd_nxt = tc->snd_una;
1920 while (snd_space > 0 && n_segs < burst_size)
1922 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1925 /* Nothing left to retransmit */
1929 bi = vlib_get_buffer_index (vm, b);
1930 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1931 snd_space -= n_written;
1932 offset += n_written;
1936 if (n_segs == burst_size)
1941 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1942 snd_space = tcp_available_cc_snd_space (tc);
1943 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1946 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1947 max_deq -= tc->snd_una_max - tc->snd_una;
1950 snd_space = clib_min (max_deq, snd_space);
1951 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1952 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1953 if (max_deq > n_segs_now * tc->snd_mss)
1954 tcp_program_fastretransmit (wrk, tc);
1955 n_segs += n_segs_now;
1958 /* Restore snd_nxt */
1959 tc->snd_nxt = old_snd_nxt;
1962 tcp_fastrecovery_first_off (tc);
1967 * Do fast retransmit
1970 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1973 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1974 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1976 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1980 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1981 u16 * next0, u32 * error0)
1983 ip_adjacency_t *adj;
1986 /* Not thread safe but as long as the connection exists the adj should
1988 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1990 if (ai == ADJ_INDEX_INVALID)
1992 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1993 *next0 = TCP_OUTPUT_NEXT_DROP;
1994 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1999 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2000 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2001 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2002 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2005 *next0 = TCP_OUTPUT_NEXT_DROP;
2006 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2008 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2012 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2013 u32 * to_next, u32 n_bufs)
2015 u32 n_trace = vlib_get_trace_count (vm, node);
2016 tcp_connection_t *tc;
2022 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2024 b = vlib_get_buffer (vm, to_next[i]);
2025 th = vlib_buffer_get_current (b);
2026 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2028 t = vlib_add_trace (vm, node, b, sizeof (*t));
2029 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2030 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2035 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2036 tcp_connection_t * tc0, u8 is_ip4)
2038 tcp_header_t *th0 = 0;
2040 th0 = vlib_buffer_get_current (b0);
2041 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2044 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2045 IP_PROTOCOL_TCP, 1);
2046 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2047 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2053 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2054 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2055 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2056 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2057 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2063 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2064 u32 * error0, u16 * next0, u8 is_ip4)
2067 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2069 *error0 = TCP_ERROR_INVALID_CONNECTION;
2070 *next0 = TCP_OUTPUT_NEXT_DROP;
2074 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2075 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2079 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2080 tcp_output_handle_link_local (tc0, b0, next0, error0);
2083 if (!TCP_ALWAYS_ACK)
2084 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2088 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2089 vlib_frame_t * frame, int is_ip4)
2091 u32 n_left_from, *from, thread_index = vm->thread_index;
2092 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2093 u16 nexts[VLIB_FRAME_SIZE], *next;
2095 from = vlib_frame_vector_args (frame);
2096 n_left_from = frame->n_vectors;
2097 tcp_set_time_now (tcp_get_worker (thread_index));
2099 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2100 tcp46_output_trace_frame (vm, node, from, n_left_from);
2102 vlib_get_buffers (vm, from, bufs, n_left_from);
2106 while (n_left_from >= 4)
2108 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2109 tcp_connection_t *tc0, *tc1;
2112 vlib_prefetch_buffer_header (b[2], STORE);
2113 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2115 vlib_prefetch_buffer_header (b[3], STORE);
2116 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2119 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2121 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2123 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2126 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2127 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2129 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2130 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2136 while (n_left_from > 0)
2138 u32 error0 = TCP_ERROR_PKTS_SENT;
2139 tcp_connection_t *tc0;
2141 if (n_left_from > 1)
2143 vlib_prefetch_buffer_header (b[1], STORE);
2144 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2147 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2148 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2151 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2152 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2159 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2160 return frame->n_vectors;
2164 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2165 vlib_frame_t * from_frame)
2167 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2171 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2172 vlib_frame_t * from_frame)
2174 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2178 VLIB_REGISTER_NODE (tcp4_output_node) =
2180 .function = tcp4_output,
2181 .name = "tcp4-output",
2182 /* Takes a vector of packets. */
2183 .vector_size = sizeof (u32),
2184 .n_errors = TCP_N_ERROR,
2185 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2186 .error_strings = tcp_error_strings,
2187 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2189 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2190 foreach_tcp4_output_next
2193 .format_buffer = format_tcp_header,
2194 .format_trace = format_tcp_tx_trace,
2198 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2201 VLIB_REGISTER_NODE (tcp6_output_node) =
2203 .function = tcp6_output,
2204 .name = "tcp6-output",
2205 /* Takes a vector of packets. */
2206 .vector_size = sizeof (u32),
2207 .n_errors = TCP_N_ERROR,
2208 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2209 .error_strings = tcp_error_strings,
2210 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2212 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2213 foreach_tcp6_output_next
2216 .format_buffer = format_tcp_header,
2217 .format_trace = format_tcp_tx_trace,
2221 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2223 typedef enum _tcp_reset_next
2225 TCP_RESET_NEXT_DROP,
2226 TCP_RESET_NEXT_IP_LOOKUP,
2230 #define foreach_tcp4_reset_next \
2231 _(DROP, "error-drop") \
2232 _(IP_LOOKUP, "ip4-lookup")
2234 #define foreach_tcp6_reset_next \
2235 _(DROP, "error-drop") \
2236 _(IP_LOOKUP, "ip6-lookup")
2239 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2240 vlib_frame_t * from_frame, u8 is_ip4)
2242 u32 n_left_from, next_index, *from, *to_next;
2243 u32 my_thread_index = vm->thread_index;
2245 from = vlib_frame_vector_args (from_frame);
2246 n_left_from = from_frame->n_vectors;
2248 next_index = node->cached_next_index;
2250 while (n_left_from > 0)
2254 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2256 while (n_left_from > 0 && n_left_to_next > 0)
2262 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2269 n_left_to_next -= 1;
2271 b0 = vlib_get_buffer (vm, bi0);
2273 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2274 my_thread_index, is_ip4))
2276 error0 = TCP_ERROR_LOOKUP_DROPS;
2277 next0 = TCP_RESET_NEXT_DROP;
2281 /* Prepare to send to IP lookup */
2282 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2283 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2286 b0->error = node->errors[error0];
2287 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2288 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2290 th0 = vlib_buffer_get_current (b0);
2292 th0 = ip4_next_header ((ip4_header_t *) th0);
2294 th0 = ip6_next_header ((ip6_header_t *) th0);
2295 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2296 clib_memcpy_fast (&t0->tcp_header, th0,
2297 sizeof (t0->tcp_header));
2300 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2301 n_left_to_next, bi0, next0);
2303 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2305 return from_frame->n_vectors;
2309 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2310 vlib_frame_t * from_frame)
2312 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2316 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2317 vlib_frame_t * from_frame)
2319 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2323 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2324 .function = tcp4_send_reset,
2325 .name = "tcp4-reset",
2326 .vector_size = sizeof (u32),
2327 .n_errors = TCP_N_ERROR,
2328 .error_strings = tcp_error_strings,
2329 .n_next_nodes = TCP_RESET_N_NEXT,
2331 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2332 foreach_tcp4_reset_next
2335 .format_trace = format_tcp_tx_trace,
2339 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2342 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2343 .function = tcp6_send_reset,
2344 .name = "tcp6-reset",
2345 .vector_size = sizeof (u32),
2346 .n_errors = TCP_N_ERROR,
2347 .error_strings = tcp_error_strings,
2348 .n_next_nodes = TCP_RESET_N_NEXT,
2350 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2351 foreach_tcp6_reset_next
2354 .format_trace = format_tcp_tx_trace,
2358 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2361 * fd.io coding-style-patch-verification: ON
2364 * eval: (c-set-style "gnu")