2 * Copyright (c) 2016-2019 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;
593 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
594 u8 is_ip4, u32 fib_index, u8 flush)
596 vlib_main_t *vm = wrk->vm;
597 u32 *to_next, next_index;
600 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
603 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
604 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
606 /* Send to IP lookup */
607 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
608 tcp_trajectory_add_start (b, 1);
610 f = wrk->ip_lookup_tx_frames[!is_ip4];
613 f = vlib_get_frame_to_node (vm, next_index);
615 wrk->ip_lookup_tx_frames[!is_ip4] = f;
618 to_next = vlib_frame_vector_args (f);
619 to_next[f->n_vectors] = bi;
621 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
623 vlib_put_frame_to_node (vm, next_index, f);
624 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
629 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
630 u32 bi, u8 is_ip4, u32 fib_index)
632 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
636 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
637 u8 is_ip4, u32 fib_index)
639 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
640 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
641 session_flush_frames_main_thread (wrk->vm);
645 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
648 u32 *to_next, next_index;
651 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
654 /* Decide where to send the packet */
655 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
656 tcp_trajectory_add_start (b, 2);
658 /* Get frame to v4/6 output node */
659 f = wrk->tx_frames[!is_ip4];
662 f = vlib_get_frame_to_node (wrk->vm, next_index);
664 wrk->tx_frames[!is_ip4] = f;
666 to_next = vlib_frame_vector_args (f);
667 to_next[f->n_vectors] = bi;
669 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
671 vlib_put_frame_to_node (wrk->vm, next_index, f);
672 wrk->tx_frames[!is_ip4] = 0;
677 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
680 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
684 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
687 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
691 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
692 tcp_state_t state, u8 thread_index, u8 is_ip4)
697 ip4_address_t src_ip40, dst_ip40;
698 ip6_address_t src_ip60, dst_ip60;
699 u16 src_port, dst_port;
704 /* Find IP and TCP headers */
705 th0 = tcp_buffer_hdr (b0);
707 /* Save src and dst ip */
710 ih4 = vlib_buffer_get_current (b0);
711 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
712 src_ip40.as_u32 = ih4->src_address.as_u32;
713 dst_ip40.as_u32 = ih4->dst_address.as_u32;
717 ih6 = vlib_buffer_get_current (b0);
718 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
719 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
720 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
723 src_port = th0->src_port;
724 dst_port = th0->dst_port;
726 /* Try to determine what/why we're actually resetting */
727 if (state == TCP_STATE_CLOSED)
732 tmp = clib_net_to_host_u32 (th0->seq_number);
734 /* Got a SYN for no listener. */
735 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
736 ack = clib_host_to_net_u32 (tmp + 1);
741 flags = TCP_FLAG_RST;
742 seq = th0->ack_number;
746 tcp_reuse_buffer (vm, b0);
747 tcp_trajectory_add_start (b0, 4);
748 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
749 sizeof (tcp_header_t), flags, 0);
753 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
755 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
760 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
762 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
770 * Send reset without reusing existing buffer
772 * It extracts connection info out of original packet
775 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
776 u32 thread_index, u8 is_ip4)
778 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
779 vlib_main_t *vm = wrk->vm;
781 u32 bi, sw_if_index, fib_index;
782 u8 tcp_hdr_len, flags = 0;
783 tcp_header_t *th, *pkt_th;
785 ip4_header_t *ih4, *pkt_ih4;
786 ip6_header_t *ih6, *pkt_ih6;
787 fib_protocol_t fib_proto;
789 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
792 b = vlib_get_buffer (vm, bi);
793 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
794 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
795 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
796 tcp_init_buffer (vm, b);
798 /* Make and write options */
799 tcp_hdr_len = sizeof (tcp_header_t);
803 pkt_ih4 = vlib_buffer_get_current (pkt);
804 pkt_th = ip4_next_header (pkt_ih4);
808 pkt_ih6 = vlib_buffer_get_current (pkt);
809 pkt_th = ip6_next_header (pkt_ih6);
812 if (tcp_ack (pkt_th))
814 flags = TCP_FLAG_RST;
815 seq = pkt_th->ack_number;
816 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
820 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
822 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
825 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
826 seq, ack, tcp_hdr_len, flags, 0);
828 /* Swap src and dst ip */
831 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
832 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
833 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
834 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
839 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
841 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
842 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
843 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
847 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
848 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
852 * Build and set reset packet for connection
855 tcp_send_reset (tcp_connection_t * tc)
857 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
858 vlib_main_t *vm = wrk->vm;
862 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
865 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
867 b = vlib_get_buffer (vm, bi);
868 tcp_init_buffer (vm, b);
870 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
871 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
872 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
873 flags = TCP_FLAG_RST;
874 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
875 tc->rcv_nxt, tcp_hdr_opts_len, flags,
877 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
878 ASSERT (opts_write_len == tc->snd_opts_len);
879 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
883 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
884 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
885 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
891 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
892 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
893 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
896 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
897 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
901 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
904 tcp_header_t *th = vlib_buffer_get_current (b);
905 vlib_main_t *vm = wrk->vm;
909 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
910 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
911 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
918 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
919 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
920 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
928 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
929 * The packet is not forwarded through tcpx_output to avoid doing lookups
930 * in the half_open pool.
933 tcp_send_syn (tcp_connection_t * tc)
935 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
936 vlib_main_t *vm = wrk->vm;
941 * Setup retransmit and establish timers before requesting buffer
942 * such that we can return if we've ran out.
944 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
945 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
946 tc->rto * TCP_TO_TIMER_TICK);
948 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
950 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
954 b = vlib_get_buffer (vm, bi);
955 tcp_init_buffer (vm, b);
956 tcp_make_syn (tc, b);
958 /* Measure RTT with this */
959 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
960 tc->rtt_seq = tc->snd_nxt;
963 tcp_push_ip_hdr (wrk, tc, b);
964 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
965 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
969 tcp_send_synack (tcp_connection_t * tc)
971 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
972 vlib_main_t *vm = wrk->vm;
976 tcp_retransmit_timer_force_update (tc);
978 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
980 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
984 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
985 b = vlib_get_buffer (vm, bi);
986 tcp_init_buffer (vm, b);
987 tcp_make_synack (tc, b);
988 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
989 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
993 * Flush tx frame populated by retransmits and timer pops
996 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
998 if (wrk->tx_frames[!is_ip4])
1001 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1002 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1003 wrk->tx_frames[!is_ip4] = 0;
1008 * Flush ip lookup tx frames populated by timer pops
1011 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1013 if (wrk->ip_lookup_tx_frames[!is_ip4])
1016 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1017 vlib_put_frame_to_node (wrk->vm, next_index,
1018 wrk->ip_lookup_tx_frames[!is_ip4]);
1019 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1024 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1027 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1029 tcp_flush_frame_to_output (wrk, 1);
1030 tcp_flush_frame_to_output (wrk, 0);
1031 tcp_flush_frame_to_ip_lookup (wrk, 1);
1032 tcp_flush_frame_to_ip_lookup (wrk, 0);
1039 tcp_send_fin (tcp_connection_t * tc)
1041 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1042 vlib_main_t *vm = wrk->vm;
1047 fin_snt = tc->flags & TCP_CONN_FINSNT;
1049 tc->snd_nxt = tc->snd_una;
1051 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1053 /* Out of buffers so program fin retransmit ASAP */
1054 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1056 tc->snd_nxt = tc->snd_una_max;
1058 /* Make sure retransmit retries a fin not data */
1059 tc->flags |= TCP_CONN_FINSNT;
1063 tcp_retransmit_timer_force_update (tc);
1064 b = vlib_get_buffer (vm, bi);
1065 tcp_init_buffer (vm, b);
1066 tcp_make_fin (tc, b);
1067 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1068 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1072 tc->flags |= TCP_CONN_FINSNT;
1073 tc->flags &= ~TCP_CONN_FINPNDG;
1074 /* Account for the FIN */
1075 tc->snd_una_max += 1;
1076 tc->snd_nxt = tc->snd_una_max;
1080 tc->snd_nxt = tc->snd_una_max;
1085 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1089 case TCP_STATE_ESTABLISHED:
1090 case TCP_STATE_CLOSE_WAIT:
1091 case TCP_STATE_TIME_WAIT:
1092 case TCP_STATE_FIN_WAIT_2:
1093 return TCP_FLAG_ACK;
1094 case TCP_STATE_SYN_RCVD:
1095 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1096 case TCP_STATE_SYN_SENT:
1097 return TCP_FLAG_SYN;
1098 case TCP_STATE_LAST_ACK:
1099 case TCP_STATE_FIN_WAIT_1:
1100 case TCP_STATE_CLOSING:
1101 if (tc->snd_nxt + 1 < tc->snd_una_max)
1102 return TCP_FLAG_ACK;
1104 return TCP_FLAG_FIN;
1106 clib_warning ("Shouldn't be here!");
1112 * Push TCP header and update connection variables
1115 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1116 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1118 u32 advertise_wnd, data_len;
1119 u8 tcp_hdr_opts_len, flags;
1120 tcp_main_t *tm = &tcp_main;
1123 data_len = b->current_length;
1124 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1125 data_len += b->total_length_not_including_first_buffer;
1127 vnet_buffer (b)->tcp.flags = 0;
1128 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1131 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1133 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1136 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1138 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1140 flags = tcp_make_state_flags (tc, next_state);
1141 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1143 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1144 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1145 flags |= TCP_FLAG_PSH;
1147 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1148 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1153 clib_memcpy_fast ((u8 *) (th + 1),
1154 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1159 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1160 ASSERT (len == tc->snd_opts_len);
1164 * Update connection variables
1167 tc->snd_nxt += data_len;
1168 tc->rcv_las = tc->rcv_nxt;
1170 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1174 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1176 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1178 tc->snd_una_max = tc->snd_nxt;
1179 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1180 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1181 /* If not tracking an ACK, start tracking */
1182 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1184 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1185 tc->rtt_seq = tc->snd_nxt;
1187 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1189 tcp_retransmit_timer_set (tc);
1192 tcp_trajectory_add_start (b, 3);
1197 tcp_send_ack (tcp_connection_t * tc)
1199 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1200 vlib_main_t *vm = wrk->vm;
1204 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1206 tcp_update_rcv_wnd (tc);
1209 b = vlib_get_buffer (vm, bi);
1210 tcp_init_buffer (vm, b);
1211 tcp_make_ack (tc, b);
1212 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1216 tcp_program_ack (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;
1226 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1228 if (!(tc->flags & TCP_CONN_SNDACK))
1230 vec_add1 (wrk->pending_acks, tc->c_c_index);
1231 tc->flags |= TCP_CONN_SNDACK;
1233 if (tc->pending_dupacks < 255)
1234 tc->pending_dupacks += 1;
1238 tcp_send_acks (tcp_worker_ctx_t * wrk)
1240 u32 thread_index, *pending_acks;
1241 tcp_connection_t *tc;
1244 if (!vec_len (wrk->pending_acks))
1247 thread_index = wrk->vm->thread_index;
1248 pending_acks = wrk->pending_acks;
1249 for (i = 0; i < vec_len (pending_acks); i++)
1251 tc = tcp_connection_get (pending_acks[i], thread_index);
1252 tc->flags &= ~TCP_CONN_SNDACK;
1253 n_acks = clib_max (1, tc->pending_dupacks);
1254 /* If we're supposed to send dupacks but have no ooo data
1255 * send only one ack */
1256 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1258 for (j = 0; j < n_acks; j++)
1260 tc->pending_dupacks = 0;
1262 _vec_len (wrk->pending_acks) = 0;
1266 * Delayed ack timer handler
1268 * Sends delayed ACK when timer expires
1271 tcp_timer_delack_handler (u32 index)
1273 u32 thread_index = vlib_get_thread_index ();
1274 tcp_connection_t *tc;
1276 tc = tcp_connection_get (index, thread_index);
1277 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1282 * Allocate a new buffer and build a new tcp segment
1284 * @param wrk tcp worker
1285 * @param tc connection for which the segment will be allocated
1286 * @param offset offset of the first byte in the tx fifo
1287 * @param max_deq_byte segment size
1288 * @param[out] b pointer to buffer allocated
1290 * @return the number of bytes in the segment or 0 if buffer cannot be
1291 * allocated or no data available
1294 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1295 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1297 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1298 vlib_main_t *vm = wrk->vm;
1303 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1308 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1311 * Allocate and fill in buffer(s)
1314 /* Easy case, buffer size greater than mss */
1315 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1317 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1319 *b = vlib_get_buffer (vm, bi);
1320 data = tcp_init_buffer (vm, *b);
1321 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1323 ASSERT (n_bytes == max_deq_bytes);
1324 b[0]->current_length = n_bytes;
1325 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1326 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1327 tc->snd_una_max = tc->snd_nxt;
1329 /* Split mss into multiple buffers */
1332 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1333 u16 n_peeked, len_to_deq;
1334 vlib_buffer_t *chain_b, *prev_b;
1337 /* Make sure we have enough buffers */
1338 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1339 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1340 CLIB_CACHE_LINE_BYTES);
1341 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1342 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1345 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1349 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1350 data = tcp_init_buffer (vm, *b);
1351 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1353 TRANSPORT_MAX_HDRS_LEN);
1354 b[0]->current_length = n_bytes;
1355 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1356 b[0]->total_length_not_including_first_buffer = 0;
1357 max_deq_bytes -= n_bytes;
1360 for (i = 1; i < n_bufs_per_seg; i++)
1363 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1364 chain_bi = wrk->tx_buffers[--n_bufs];
1365 chain_b = vlib_get_buffer (vm, chain_bi);
1366 chain_b->current_data = 0;
1367 data = vlib_buffer_get_current (chain_b);
1368 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1369 offset + n_bytes, len_to_deq);
1370 ASSERT (n_peeked == len_to_deq);
1371 n_bytes += n_peeked;
1372 chain_b->current_length = n_peeked;
1373 chain_b->next_buffer = 0;
1375 /* update previous buffer */
1376 prev_b->next_buffer = chain_bi;
1377 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1379 max_deq_bytes -= n_peeked;
1380 b[0]->total_length_not_including_first_buffer += n_peeked;
1383 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1384 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1385 tc->snd_una_max = tc->snd_nxt;
1387 if (PREDICT_FALSE (n_bufs))
1389 clib_warning ("not all buffers consumed");
1390 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1394 ASSERT (n_bytes > 0);
1395 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1401 * Build a retransmit segment
1403 * @return the number of bytes in the segment or 0 if there's nothing to
1407 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1408 tcp_connection_t * tc, u32 offset,
1409 u32 max_deq_bytes, vlib_buffer_t ** b)
1411 u32 start, available_bytes;
1414 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1415 ASSERT (max_deq_bytes != 0);
1418 * Make sure we can retransmit something
1420 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1421 ASSERT (available_bytes >= offset);
1422 available_bytes -= offset;
1423 if (!available_bytes)
1426 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1427 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1429 /* Start is beyond snd_congestion */
1430 start = tc->snd_una + offset;
1431 if (seq_geq (start, tc->snd_congestion))
1434 /* Don't overshoot snd_congestion */
1435 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1437 max_deq_bytes = tc->snd_congestion - start;
1438 if (max_deq_bytes == 0)
1442 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1446 if (tcp_in_fastrecovery (tc))
1447 tc->snd_rxt_bytes += n_bytes;
1450 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1455 * Reset congestion control, switch cwnd to loss window and try again.
1458 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1460 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1461 tc->prev_ssthresh = tc->ssthresh;
1462 tc->prev_cwnd = tc->cwnd;
1464 /* Cleanly recover cc (also clears up fast retransmit) */
1465 if (tcp_in_fastrecovery (tc))
1467 /* TODO be less aggressive about this */
1468 scoreboard_clear (&tc->sack_sb);
1469 tcp_cc_fastrecovery_exit (tc);
1472 tc->rcv_dupacks = 0;
1474 /* Start again from the beginning */
1475 tc->cc_algo->congestion (tc);
1476 tc->cwnd = tcp_loss_wnd (tc);
1477 tc->snd_congestion = tc->snd_una_max;
1479 tc->cwnd_acc_bytes = 0;
1480 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1481 tcp_recovery_on (tc);
1485 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1487 u32 thread_index = vlib_get_thread_index ();
1488 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1489 vlib_main_t *vm = wrk->vm;
1490 tcp_connection_t *tc;
1491 vlib_buffer_t *b = 0;
1496 tc = tcp_half_open_connection_get (index);
1497 /* Note: the connection may have transitioned to ESTABLISHED... */
1498 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1500 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1504 tc = tcp_connection_get (index, thread_index);
1505 /* Note: the connection may have been closed and pool_put */
1506 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1508 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1509 /* Wait-close and retransmit could pop at the same time */
1510 if (tc->state == TCP_STATE_CLOSED)
1514 if (tc->state >= TCP_STATE_ESTABLISHED)
1516 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1518 /* Lost FIN, retransmit and return */
1519 if (tc->flags & TCP_CONN_FINSNT)
1523 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1527 /* Shouldn't be here. This condition is tricky because it has to take
1528 * into account boff > 0 due to persist timeout. */
1529 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1530 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1531 && !tcp_flight_size (tc)))
1533 ASSERT (!tcp_in_recovery (tc));
1538 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1539 * to persist timer timeout */
1540 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1543 tcp_update_rto (tc);
1546 /* Increment RTO backoff (also equal to number of retries) and go back
1547 * to first un-acked byte */
1550 /* First retransmit timeout */
1551 if (tc->rto_boff == 1)
1552 tcp_rxt_timeout_cc (tc);
1554 scoreboard_clear (&tc->sack_sb);
1556 /* If we've sent beyond snd_congestion, update it */
1557 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1558 tc->snd_congestion = tc->snd_una_max;
1560 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1561 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1563 /* Send one segment. Note that n_bytes may be zero due to buffer
1565 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1568 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1572 bi = vlib_get_buffer_index (vm, b);
1574 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1575 if (tc->rto_boff == 1)
1576 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1578 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1579 tcp_retransmit_timer_force_update (tc);
1581 /* Retransmit for SYN */
1582 else if (tc->state == TCP_STATE_SYN_SENT)
1584 /* Half-open connection actually moved to established but we were
1585 * waiting for syn retransmit to pop to call cleanup from the right
1587 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1589 if (tcp_half_open_connection_cleanup (tc))
1590 TCP_DBG ("could not remove half-open connection");
1594 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1596 /* Try without increasing RTO a number of times. If this fails,
1597 * start growing RTO exponentially */
1599 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1600 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1602 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1603 tc->rto * TCP_TO_TIMER_TICK);
1605 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1607 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1611 b = vlib_get_buffer (vm, bi);
1612 tcp_init_buffer (vm, b);
1613 tcp_make_syn (tc, b);
1616 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1618 /* This goes straight to ipx_lookup. Retransmit timer set already */
1619 tcp_push_ip_hdr (wrk, tc, b);
1620 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1622 /* Retransmit SYN-ACK */
1623 else if (tc->state == TCP_STATE_SYN_RCVD)
1625 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1628 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1629 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1632 tcp_retransmit_timer_force_update (tc);
1634 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1636 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1640 b = vlib_get_buffer (vm, bi);
1641 tcp_init_buffer (vm, b);
1642 tcp_make_synack (tc, b);
1643 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1645 /* Retransmit timer already updated, just enqueue to output */
1646 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1650 ASSERT (tc->state == TCP_STATE_CLOSED);
1656 tcp_timer_retransmit_handler (u32 index)
1658 tcp_timer_retransmit_handler_i (index, 0);
1662 tcp_timer_retransmit_syn_handler (u32 index)
1664 tcp_timer_retransmit_handler_i (index, 1);
1668 * Got 0 snd_wnd from peer, try to do something about it.
1672 tcp_timer_persist_handler (u32 index)
1674 u32 thread_index = vlib_get_thread_index ();
1675 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1676 u32 bi, max_snd_bytes, available_bytes, offset;
1677 tcp_main_t *tm = vnet_get_tcp_main ();
1678 vlib_main_t *vm = wrk->vm;
1679 tcp_connection_t *tc;
1684 tc = tcp_connection_get_if_valid (index, thread_index);
1689 /* Make sure timer handle is set to invalid */
1690 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1692 /* Problem already solved or worse */
1693 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1694 || tc->snd_wnd > tc->snd_mss)
1697 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1698 offset = tc->snd_una_max - tc->snd_una;
1700 /* Reprogram persist if no new bytes available to send. We may have data
1702 if (!available_bytes)
1704 tcp_persist_timer_set (tc);
1708 if (available_bytes <= offset)
1710 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1714 /* Increment RTO backoff */
1716 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1719 * Try to force the first unsent segment (or buffer)
1721 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1723 tcp_persist_timer_set (tc);
1726 b = vlib_get_buffer (vm, bi);
1727 data = tcp_init_buffer (vm, b);
1729 tcp_validate_txf_size (tc, offset);
1730 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1732 clib_min (tc->snd_mss, tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1734 stream_session_peek_bytes (&tc->connection, data, offset, max_snd_bytes);
1735 b->current_length = n_bytes;
1736 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1737 || tc->snd_nxt == tc->snd_una_max
1738 || tc->rto_boff > 1));
1740 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1741 tc->snd_una_max = tc->snd_nxt;
1742 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1743 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1745 /* Just sent new data, enable retransmit */
1746 tcp_retransmit_timer_update (tc);
1750 * Retransmit first unacked segment
1753 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1755 u32 bi, old_snd_nxt, n_bytes;
1756 vlib_main_t *vm = wrk->vm;
1759 old_snd_nxt = tc->snd_nxt;
1760 tc->snd_nxt = tc->snd_una;
1762 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1764 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1768 bi = vlib_get_buffer_index (vm, b);
1769 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1770 tc->snd_nxt = old_snd_nxt;
1776 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1779 u32 offset, n_segs = 0, n_written, bi;
1780 vlib_main_t *vm = wrk->vm;
1781 vlib_buffer_t *b = 0;
1783 tc->snd_nxt = tc->snd_una_max;
1784 offset = tc->snd_una_max - tc->snd_una;
1785 while (n_segs < burst_size)
1787 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1791 bi = vlib_get_buffer_index (vm, b);
1792 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1793 offset += n_written;
1801 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1802 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1803 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1806 * Do fast retransmit with SACKs
1809 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1812 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1813 sack_scoreboard_hole_t *hole;
1814 vlib_main_t *vm = wrk->vm;
1815 vlib_buffer_t *b = 0;
1816 sack_scoreboard_t *sb;
1817 u32 bi, old_snd_nxt;
1820 u8 snd_limited = 0, can_rescue = 0;
1822 ASSERT (tcp_in_fastrecovery (tc));
1824 snd_space = tcp_available_cc_snd_space (tc);
1825 if (snd_space < tc->snd_mss)
1827 tcp_program_fastretransmit (wrk, tc);
1831 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1832 old_snd_nxt = tc->snd_nxt;
1834 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1836 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1837 max_deq -= tc->snd_una_max - tc->snd_una;
1839 while (snd_space > 0 && n_segs < burst_size)
1841 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1847 snd_space = clib_min (max_deq, snd_space);
1848 burst_size = clib_min (burst_size - n_segs,
1849 snd_space / tc->snd_mss);
1850 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1851 if (max_deq > n_segs_now * tc->snd_mss)
1852 tcp_program_fastretransmit (wrk, tc);
1853 n_segs += n_segs_now;
1857 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1860 /* If rescue rxt undefined or less than snd_una then one segment of
1861 * up to SMSS octets that MUST include the highest outstanding
1862 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1863 * RecoveryPoint. HighRxt MUST NOT be updated.
1865 max_bytes = clib_min (tc->snd_mss,
1866 tc->snd_congestion - tc->snd_una);
1867 max_bytes = clib_min (max_bytes, snd_space);
1868 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1869 sb->rescue_rxt = tc->snd_congestion;
1870 tc->snd_nxt = tc->snd_una + offset;
1871 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1876 bi = vlib_get_buffer_index (vm, b);
1877 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1882 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1883 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1887 offset = sb->high_rxt - tc->snd_una;
1888 tc->snd_nxt = sb->high_rxt;
1889 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1891 ASSERT (n_written <= snd_space);
1893 /* Nothing left to retransmit */
1897 bi = vlib_get_buffer_index (vm, b);
1898 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1900 sb->high_rxt += n_written;
1901 snd_space -= n_written;
1906 tcp_program_fastretransmit (wrk, tc);
1909 /* If window allows, send 1 SMSS of new data */
1910 tc->snd_nxt = old_snd_nxt;
1915 * Fast retransmit without SACK info
1918 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1921 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1922 vlib_main_t *vm = wrk->vm;
1923 int snd_space, n_segs = 0;
1926 ASSERT (tcp_in_fastrecovery (tc));
1927 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1928 old_snd_nxt = tc->snd_nxt;
1930 if (!tcp_fastrecovery_first (tc))
1933 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1935 snd_space = tc->sack_sb.last_bytes_delivered;
1936 tc->snd_nxt = tc->snd_una;
1937 while (snd_space > 0 && n_segs < burst_size)
1939 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1942 /* Nothing left to retransmit */
1946 bi = vlib_get_buffer_index (vm, b);
1947 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1948 snd_space -= n_written;
1949 offset += n_written;
1953 if (n_segs == burst_size)
1958 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1959 snd_space = tcp_available_cc_snd_space (tc);
1960 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1963 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1964 max_deq -= tc->snd_una_max - tc->snd_una;
1967 snd_space = clib_min (max_deq, snd_space);
1968 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1969 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1970 if (max_deq > n_segs_now * tc->snd_mss)
1971 tcp_program_fastretransmit (wrk, tc);
1972 n_segs += n_segs_now;
1975 /* Restore snd_nxt */
1976 tc->snd_nxt = old_snd_nxt;
1979 tcp_fastrecovery_first_off (tc);
1984 * Do fast retransmit
1987 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1990 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1991 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1993 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1997 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1998 u16 * next0, u32 * error0)
2000 ip_adjacency_t *adj;
2003 /* Not thread safe but as long as the connection exists the adj should
2005 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2007 if (ai == ADJ_INDEX_INVALID)
2009 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2010 *next0 = TCP_OUTPUT_NEXT_DROP;
2011 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2016 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2017 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2018 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2019 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2022 *next0 = TCP_OUTPUT_NEXT_DROP;
2023 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2025 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2029 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2030 u32 * to_next, u32 n_bufs)
2032 u32 n_trace = vlib_get_trace_count (vm, node);
2033 tcp_connection_t *tc;
2039 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2041 b = vlib_get_buffer (vm, to_next[i]);
2042 th = vlib_buffer_get_current (b);
2043 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2045 t = vlib_add_trace (vm, node, b, sizeof (*t));
2046 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2047 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2052 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2053 tcp_connection_t * tc0, u8 is_ip4)
2055 tcp_header_t *th0 = 0;
2057 th0 = vlib_buffer_get_current (b0);
2058 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2061 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2062 IP_PROTOCOL_TCP, 1);
2063 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2064 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2070 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2071 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2072 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2073 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2074 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2080 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2081 u32 * error0, u16 * next0, u8 is_ip4)
2084 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2086 *error0 = TCP_ERROR_INVALID_CONNECTION;
2087 *next0 = TCP_OUTPUT_NEXT_DROP;
2091 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2092 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2096 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2097 tcp_output_handle_link_local (tc0, b0, next0, error0);
2100 if (!TCP_ALWAYS_ACK)
2101 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2105 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2106 vlib_frame_t * frame, int is_ip4)
2108 u32 n_left_from, *from, thread_index = vm->thread_index;
2109 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2110 u16 nexts[VLIB_FRAME_SIZE], *next;
2112 from = vlib_frame_vector_args (frame);
2113 n_left_from = frame->n_vectors;
2114 tcp_set_time_now (tcp_get_worker (thread_index));
2116 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2117 tcp46_output_trace_frame (vm, node, from, n_left_from);
2119 vlib_get_buffers (vm, from, bufs, n_left_from);
2123 while (n_left_from >= 4)
2125 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2126 tcp_connection_t *tc0, *tc1;
2129 vlib_prefetch_buffer_header (b[2], STORE);
2130 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2132 vlib_prefetch_buffer_header (b[3], STORE);
2133 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2136 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2138 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2140 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2143 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2144 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2146 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2147 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2153 while (n_left_from > 0)
2155 u32 error0 = TCP_ERROR_PKTS_SENT;
2156 tcp_connection_t *tc0;
2158 if (n_left_from > 1)
2160 vlib_prefetch_buffer_header (b[1], STORE);
2161 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2164 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2165 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2168 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2169 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2176 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2177 return frame->n_vectors;
2181 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2182 vlib_frame_t * from_frame)
2184 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2188 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2189 vlib_frame_t * from_frame)
2191 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2195 VLIB_REGISTER_NODE (tcp4_output_node) =
2197 .function = tcp4_output,
2198 .name = "tcp4-output",
2199 /* Takes a vector of packets. */
2200 .vector_size = sizeof (u32),
2201 .n_errors = TCP_N_ERROR,
2202 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2203 .error_strings = tcp_error_strings,
2204 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2206 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2207 foreach_tcp4_output_next
2210 .format_buffer = format_tcp_header,
2211 .format_trace = format_tcp_tx_trace,
2215 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2218 VLIB_REGISTER_NODE (tcp6_output_node) =
2220 .function = tcp6_output,
2221 .name = "tcp6-output",
2222 /* Takes a vector of packets. */
2223 .vector_size = sizeof (u32),
2224 .n_errors = TCP_N_ERROR,
2225 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2226 .error_strings = tcp_error_strings,
2227 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2229 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2230 foreach_tcp6_output_next
2233 .format_buffer = format_tcp_header,
2234 .format_trace = format_tcp_tx_trace,
2238 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2240 typedef enum _tcp_reset_next
2242 TCP_RESET_NEXT_DROP,
2243 TCP_RESET_NEXT_IP_LOOKUP,
2247 #define foreach_tcp4_reset_next \
2248 _(DROP, "error-drop") \
2249 _(IP_LOOKUP, "ip4-lookup")
2251 #define foreach_tcp6_reset_next \
2252 _(DROP, "error-drop") \
2253 _(IP_LOOKUP, "ip6-lookup")
2256 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2257 vlib_frame_t * from_frame, u8 is_ip4)
2259 u32 n_left_from, next_index, *from, *to_next;
2260 u32 my_thread_index = vm->thread_index;
2262 from = vlib_frame_vector_args (from_frame);
2263 n_left_from = from_frame->n_vectors;
2265 next_index = node->cached_next_index;
2267 while (n_left_from > 0)
2271 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2273 while (n_left_from > 0 && n_left_to_next > 0)
2279 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2286 n_left_to_next -= 1;
2288 b0 = vlib_get_buffer (vm, bi0);
2290 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2291 my_thread_index, is_ip4))
2293 error0 = TCP_ERROR_LOOKUP_DROPS;
2294 next0 = TCP_RESET_NEXT_DROP;
2298 /* Prepare to send to IP lookup */
2299 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2300 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2303 b0->error = node->errors[error0];
2304 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2305 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2307 th0 = vlib_buffer_get_current (b0);
2309 th0 = ip4_next_header ((ip4_header_t *) th0);
2311 th0 = ip6_next_header ((ip6_header_t *) th0);
2312 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2313 clib_memcpy_fast (&t0->tcp_header, th0,
2314 sizeof (t0->tcp_header));
2317 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2318 n_left_to_next, bi0, next0);
2320 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2322 return from_frame->n_vectors;
2326 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2327 vlib_frame_t * from_frame)
2329 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2333 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2334 vlib_frame_t * from_frame)
2336 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2340 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2341 .function = tcp4_send_reset,
2342 .name = "tcp4-reset",
2343 .vector_size = sizeof (u32),
2344 .n_errors = TCP_N_ERROR,
2345 .error_strings = tcp_error_strings,
2346 .n_next_nodes = TCP_RESET_N_NEXT,
2348 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2349 foreach_tcp4_reset_next
2352 .format_trace = format_tcp_tx_trace,
2356 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2359 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2360 .function = tcp6_send_reset,
2361 .name = "tcp6-reset",
2362 .vector_size = sizeof (u32),
2363 .n_errors = TCP_N_ERROR,
2364 .error_strings = tcp_error_strings,
2365 .n_next_nodes = TCP_RESET_N_NEXT,
2367 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2368 foreach_tcp6_reset_next
2371 .format_trace = format_tcp_tx_trace,
2375 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2378 * fd.io coding-style-patch-verification: ON
2381 * eval: (c-set-style "gnu")