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 typedef enum _tcp_output_next
22 TCP_OUTPUT_NEXT_IP_LOOKUP,
23 TCP_OUTPUT_NEXT_IP_REWRITE,
24 TCP_OUTPUT_NEXT_IP_ARP,
28 #define foreach_tcp4_output_next \
29 _ (DROP, "error-drop") \
30 _ (IP_LOOKUP, "ip4-lookup") \
31 _ (IP_REWRITE, "ip4-rewrite") \
34 #define foreach_tcp6_output_next \
35 _ (DROP, "error-drop") \
36 _ (IP_LOOKUP, "ip6-lookup") \
37 _ (IP_REWRITE, "ip6-rewrite") \
38 _ (IP_ARP, "ip6-discover-neighbor")
40 static char *tcp_error_strings[] = {
41 #define tcp_error(n,s) s,
42 #include <vnet/tcp/tcp_error.def>
48 tcp_header_t tcp_header;
49 tcp_connection_t tcp_connection;
52 #ifndef CLIB_MARCH_VARIANT
54 #endif /* CLIB_MARCH_VARIANT */
57 format_tcp_tx_trace (u8 * s, va_list * args)
59 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
60 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
61 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
62 u32 indent = format_get_indent (s);
64 s = format (s, "%U\n%U%U",
65 format_tcp_header, &t->tcp_header, 128,
66 format_white_space, indent,
67 format_tcp_connection, &t->tcp_connection, 1);
72 #ifndef CLIB_MARCH_VARIANT
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))
257 if (opts->n_sack_blocks != 0)
259 *data++ = TCP_OPTION_SACK_BLOCK;
260 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
261 for (i = 0; i < opts->n_sack_blocks; i++)
263 buf = clib_host_to_net_u32 (opts->sacks[i].start);
264 clib_memcpy_fast (data, &buf, seq_len);
266 buf = clib_host_to_net_u32 (opts->sacks[i].end);
267 clib_memcpy_fast (data, &buf, seq_len);
270 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
274 /* Terminate TCP options */
277 *data++ = TCP_OPTION_EOL;
278 opts_len += TCP_OPTION_LEN_EOL;
281 /* Pad with zeroes to a u32 boundary */
284 *data++ = TCP_OPTION_NOOP;
285 opts_len += TCP_OPTION_LEN_NOOP;
291 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
295 opts->flags |= TCP_OPTS_FLAG_MSS;
296 opts->mss = dummy_mtu; /*XXX discover that */
297 len += TCP_OPTION_LEN_MSS;
299 opts->flags |= TCP_OPTS_FLAG_WSCALE;
300 opts->wscale = wnd_scale;
301 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
304 opts->tsval = tcp_time_now ();
306 len += TCP_OPTION_LEN_TIMESTAMP;
310 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
311 len += TCP_OPTION_LEN_SACK_PERMITTED;
314 /* Align to needed boundary */
315 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
320 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
324 opts->flags |= TCP_OPTS_FLAG_MSS;
326 len += TCP_OPTION_LEN_MSS;
328 if (tcp_opts_wscale (&tc->rcv_opts))
330 opts->flags |= TCP_OPTS_FLAG_WSCALE;
331 opts->wscale = tc->rcv_wscale;
332 len += TCP_OPTION_LEN_WINDOW_SCALE;
335 if (tcp_opts_tstamp (&tc->rcv_opts))
337 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
338 opts->tsval = tcp_time_now ();
339 opts->tsecr = tc->tsval_recent;
340 len += TCP_OPTION_LEN_TIMESTAMP;
343 if (tcp_opts_sack_permitted (&tc->rcv_opts))
345 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
346 len += TCP_OPTION_LEN_SACK_PERMITTED;
349 /* Align to needed boundary */
350 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
355 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
361 if (tcp_opts_tstamp (&tc->rcv_opts))
363 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
364 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
365 opts->tsecr = tc->tsval_recent;
366 len += TCP_OPTION_LEN_TIMESTAMP;
368 if (tcp_opts_sack_permitted (&tc->rcv_opts))
370 if (vec_len (tc->snd_sacks))
372 opts->flags |= TCP_OPTS_FLAG_SACK;
373 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
374 tc->snd_sack_pos = 0;
375 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
376 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
377 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
378 TCP_OPTS_MAX_SACK_BLOCKS);
379 tc->snd_sack_pos += opts->n_sack_blocks;
380 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
384 /* Align to needed boundary */
385 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
390 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
395 case TCP_STATE_ESTABLISHED:
396 case TCP_STATE_CLOSE_WAIT:
397 case TCP_STATE_FIN_WAIT_1:
398 case TCP_STATE_LAST_ACK:
399 case TCP_STATE_CLOSING:
400 case TCP_STATE_FIN_WAIT_2:
401 case TCP_STATE_TIME_WAIT:
402 case TCP_STATE_CLOSED:
403 return tcp_make_established_options (tc, opts);
404 case TCP_STATE_SYN_RCVD:
405 return tcp_make_synack_options (tc, opts);
406 case TCP_STATE_SYN_SENT:
407 return tcp_make_syn_options (opts, tc->rcv_wscale);
409 clib_warning ("State not handled! %d", state);
415 * Update burst send vars
417 * - Updates snd_mss to reflect the effective segment size that we can send
418 * by taking into account all TCP options, including SACKs.
419 * - Cache 'on the wire' options for reuse
420 * - Updates receive window which can be reused for a burst.
422 * This should *only* be called when doing bursts
425 tcp_update_burst_snd_vars (tcp_connection_t * tc)
427 tcp_main_t *tm = &tcp_main;
429 /* Compute options to be used for connection. These may be reused when
430 * sending data or to compute the effective mss (snd_mss) */
431 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
432 TCP_STATE_ESTABLISHED);
434 /* XXX check if MTU has been updated */
435 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
436 ASSERT (tc->snd_mss > 0);
438 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
441 tcp_update_rcv_wnd (tc);
445 tcp_init_mss (tcp_connection_t * tc)
447 u16 default_min_mss = 536;
448 tcp_update_rcv_mss (tc);
450 /* TODO cache mss and consider PMTU discovery */
451 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
453 if (tc->snd_mss < 45)
455 /* Assume that at least the min default mss works */
456 tc->snd_mss = default_min_mss;
457 tc->rcv_opts.mss = default_min_mss;
460 /* We should have enough space for 40 bytes of options */
461 ASSERT (tc->snd_mss > 45);
463 /* If we use timestamp option, account for it */
464 if (tcp_opts_tstamp (&tc->rcv_opts))
465 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
467 #endif /* CLIB_MARCH_VARIANT */
470 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
472 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
473 vlib_buffer_free_one (vm, b->next_buffer);
474 /* Zero all flags but free list index and trace flag */
475 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
477 b->current_length = 0;
478 b->total_length_not_including_first_buffer = 0;
479 vnet_buffer (b)->tcp.flags = 0;
481 /* Leave enough space for headers */
482 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
485 #ifndef CLIB_MARCH_VARIANT
487 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
489 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
490 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
491 b->total_length_not_including_first_buffer = 0;
493 vnet_buffer (b)->tcp.flags = 0;
494 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
495 /* Leave enough space for headers */
496 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
503 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
506 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
507 u8 tcp_opts_len, tcp_hdr_opts_len;
511 wnd = tcp_window_to_advertise (tc, state);
513 /* Make and write options */
514 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
515 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
517 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
518 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
520 tcp_options_write ((u8 *) (th + 1), snd_opts);
521 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
525 * Convert buffer to ACK
528 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
530 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
531 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
532 tc->rcv_las = tc->rcv_nxt;
536 * Convert buffer to FIN-ACK
539 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
541 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
543 /* Reset flags, make sure ack is sent */
544 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
548 * Convert buffer to SYN
551 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
553 u8 tcp_hdr_opts_len, tcp_opts_len;
556 tcp_options_t snd_opts;
558 initial_wnd = tcp_initial_window_to_advertise (tc);
560 /* Make and write options */
561 clib_memset (&snd_opts, 0, sizeof (snd_opts));
562 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
563 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
565 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
566 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
568 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
569 tcp_options_write ((u8 *) (th + 1), &snd_opts);
573 * Convert buffer to SYN-ACK
576 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
578 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
579 u8 tcp_opts_len, tcp_hdr_opts_len;
583 clib_memset (snd_opts, 0, sizeof (*snd_opts));
584 initial_wnd = tcp_initial_window_to_advertise (tc);
585 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
586 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
588 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
589 tc->rcv_nxt, tcp_hdr_opts_len,
590 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
591 tcp_options_write ((u8 *) (th + 1), snd_opts);
593 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
597 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
598 u8 is_ip4, u32 fib_index, u8 flush)
600 vlib_main_t *vm = wrk->vm;
601 u32 *to_next, next_index;
604 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
607 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
608 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
610 /* Send to IP lookup */
611 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
612 tcp_trajectory_add_start (b, 1);
614 f = wrk->ip_lookup_tx_frames[!is_ip4];
617 f = vlib_get_frame_to_node (vm, next_index);
619 wrk->ip_lookup_tx_frames[!is_ip4] = f;
622 to_next = vlib_frame_vector_args (f);
623 to_next[f->n_vectors] = bi;
625 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
627 vlib_put_frame_to_node (vm, next_index, f);
628 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
633 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
634 u32 bi, u8 is_ip4, u32 fib_index)
636 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
640 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
641 u8 is_ip4, u32 fib_index)
643 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
644 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
645 session_flush_frames_main_thread (wrk->vm);
649 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
652 u32 *to_next, next_index;
655 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
658 /* Decide where to send the packet */
659 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
660 tcp_trajectory_add_start (b, 2);
662 /* Get frame to v4/6 output node */
663 f = wrk->tx_frames[!is_ip4];
666 f = vlib_get_frame_to_node (wrk->vm, next_index);
668 wrk->tx_frames[!is_ip4] = f;
670 to_next = vlib_frame_vector_args (f);
671 to_next[f->n_vectors] = bi;
673 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
675 vlib_put_frame_to_node (wrk->vm, next_index, f);
676 wrk->tx_frames[!is_ip4] = 0;
681 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
684 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
688 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
691 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
693 #endif /* CLIB_MARCH_VARIANT */
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);
774 #ifndef CLIB_MARCH_VARIANT
776 * Send reset without reusing existing buffer
778 * It extracts connection info out of original packet
781 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
782 u32 thread_index, u8 is_ip4)
784 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
785 vlib_main_t *vm = wrk->vm;
787 u32 bi, sw_if_index, fib_index;
788 u8 tcp_hdr_len, flags = 0;
789 tcp_header_t *th, *pkt_th;
791 ip4_header_t *ih4, *pkt_ih4;
792 ip6_header_t *ih6, *pkt_ih6;
793 fib_protocol_t fib_proto;
795 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
798 b = vlib_get_buffer (vm, bi);
799 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
800 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
801 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
802 tcp_init_buffer (vm, b);
804 /* Make and write options */
805 tcp_hdr_len = sizeof (tcp_header_t);
809 pkt_ih4 = vlib_buffer_get_current (pkt);
810 pkt_th = ip4_next_header (pkt_ih4);
814 pkt_ih6 = vlib_buffer_get_current (pkt);
815 pkt_th = ip6_next_header (pkt_ih6);
818 if (tcp_ack (pkt_th))
820 flags = TCP_FLAG_RST;
821 seq = pkt_th->ack_number;
822 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
826 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
828 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
831 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
832 seq, ack, tcp_hdr_len, flags, 0);
834 /* Swap src and dst ip */
837 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
838 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
839 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
840 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
845 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
847 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
848 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
849 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
853 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
854 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
858 * Build and set reset packet for connection
861 tcp_send_reset (tcp_connection_t * tc)
863 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
864 vlib_main_t *vm = wrk->vm;
868 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
871 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
873 b = vlib_get_buffer (vm, bi);
874 tcp_init_buffer (vm, b);
876 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
877 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
878 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
879 flags = TCP_FLAG_RST;
880 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
881 tc->rcv_nxt, tcp_hdr_opts_len, flags,
883 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
884 ASSERT (opts_write_len == tc->snd_opts_len);
885 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
889 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
890 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
891 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
897 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
898 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
899 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
902 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
903 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
907 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
910 tcp_header_t *th = vlib_buffer_get_current (b);
911 vlib_main_t *vm = wrk->vm;
915 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
916 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
917 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
924 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
925 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
926 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
934 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
935 * The packet is not forwarded through tcpx_output to avoid doing lookups
936 * in the half_open pool.
939 tcp_send_syn (tcp_connection_t * tc)
941 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
942 vlib_main_t *vm = wrk->vm;
947 * Setup retransmit and establish timers before requesting buffer
948 * such that we can return if we've ran out.
950 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
951 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
952 tc->rto * TCP_TO_TIMER_TICK);
954 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
956 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
960 b = vlib_get_buffer (vm, bi);
961 tcp_init_buffer (vm, b);
962 tcp_make_syn (tc, b);
964 /* Measure RTT with this */
965 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
966 tc->rtt_seq = tc->snd_nxt;
969 tcp_push_ip_hdr (wrk, tc, b);
970 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
971 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
975 tcp_send_synack (tcp_connection_t * tc)
977 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
978 vlib_main_t *vm = wrk->vm;
982 tcp_retransmit_timer_force_update (tc);
984 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
986 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
990 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
991 b = vlib_get_buffer (vm, bi);
992 tcp_init_buffer (vm, b);
993 tcp_make_synack (tc, b);
994 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
995 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
999 * Flush tx frame populated by retransmits and timer pops
1002 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1004 if (wrk->tx_frames[!is_ip4])
1007 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1008 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1009 wrk->tx_frames[!is_ip4] = 0;
1014 * Flush ip lookup tx frames populated by timer pops
1017 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1019 if (wrk->ip_lookup_tx_frames[!is_ip4])
1022 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1023 vlib_put_frame_to_node (wrk->vm, next_index,
1024 wrk->ip_lookup_tx_frames[!is_ip4]);
1025 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1030 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1033 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1035 tcp_flush_frame_to_output (wrk, 1);
1036 tcp_flush_frame_to_output (wrk, 0);
1037 tcp_flush_frame_to_ip_lookup (wrk, 1);
1038 tcp_flush_frame_to_ip_lookup (wrk, 0);
1045 tcp_send_fin (tcp_connection_t * tc)
1047 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1048 vlib_main_t *vm = wrk->vm;
1053 fin_snt = tc->flags & TCP_CONN_FINSNT;
1055 tc->snd_nxt = tc->snd_una;
1057 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1059 /* Out of buffers so program fin retransmit ASAP */
1060 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1062 tc->snd_nxt = tc->snd_una_max;
1064 /* Make sure retransmit retries a fin not data */
1065 tc->flags |= TCP_CONN_FINSNT;
1069 tcp_retransmit_timer_force_update (tc);
1070 b = vlib_get_buffer (vm, bi);
1071 tcp_init_buffer (vm, b);
1072 tcp_make_fin (tc, b);
1073 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1074 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1078 tc->flags |= TCP_CONN_FINSNT;
1079 tc->flags &= ~TCP_CONN_FINPNDG;
1080 /* Account for the FIN */
1081 tc->snd_una_max += 1;
1082 tc->snd_nxt = tc->snd_una_max;
1086 tc->snd_nxt = tc->snd_una_max;
1091 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1095 case TCP_STATE_ESTABLISHED:
1096 case TCP_STATE_CLOSE_WAIT:
1097 case TCP_STATE_TIME_WAIT:
1098 case TCP_STATE_FIN_WAIT_2:
1099 return TCP_FLAG_ACK;
1100 case TCP_STATE_SYN_RCVD:
1101 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1102 case TCP_STATE_SYN_SENT:
1103 return TCP_FLAG_SYN;
1104 case TCP_STATE_LAST_ACK:
1105 case TCP_STATE_FIN_WAIT_1:
1106 case TCP_STATE_CLOSING:
1107 if (tc->snd_nxt + 1 < tc->snd_una_max)
1108 return TCP_FLAG_ACK;
1110 return TCP_FLAG_FIN;
1112 clib_warning ("Shouldn't be here!");
1118 * Push TCP header and update connection variables
1121 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1122 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1124 u32 advertise_wnd, data_len;
1125 u8 tcp_hdr_opts_len, flags;
1126 tcp_main_t *tm = &tcp_main;
1129 data_len = b->current_length;
1130 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1131 data_len += b->total_length_not_including_first_buffer;
1133 vnet_buffer (b)->tcp.flags = 0;
1134 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1137 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1139 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1142 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1144 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1146 flags = tcp_make_state_flags (tc, next_state);
1147 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1149 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1150 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1151 flags |= TCP_FLAG_PSH;
1153 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1154 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1159 clib_memcpy_fast ((u8 *) (th + 1),
1160 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1165 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1166 ASSERT (len == tc->snd_opts_len);
1170 * Update connection variables
1173 tc->snd_nxt += data_len;
1174 tc->rcv_las = tc->rcv_nxt;
1176 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1180 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1182 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1184 tc->snd_una_max = tc->snd_nxt;
1185 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1186 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1187 /* If not tracking an ACK, start tracking */
1188 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1190 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1191 tc->rtt_seq = tc->snd_nxt;
1193 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1195 tcp_retransmit_timer_set (tc);
1198 tcp_trajectory_add_start (b, 3);
1203 tcp_send_ack (tcp_connection_t * tc)
1205 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1206 vlib_main_t *vm = wrk->vm;
1210 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1212 tcp_update_rcv_wnd (tc);
1215 b = vlib_get_buffer (vm, bi);
1216 tcp_init_buffer (vm, b);
1217 tcp_make_ack (tc, b);
1218 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1222 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1224 if (!(tc->flags & TCP_CONN_SNDACK))
1226 vec_add1 (wrk->pending_acks, tc->c_c_index);
1227 tc->flags |= TCP_CONN_SNDACK;
1232 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1234 if (!(tc->flags & TCP_CONN_SNDACK))
1236 vec_add1 (wrk->pending_acks, tc->c_c_index);
1237 tc->flags |= TCP_CONN_SNDACK;
1239 if (tc->pending_dupacks < 255)
1240 tc->pending_dupacks += 1;
1244 tcp_send_acks (tcp_worker_ctx_t * wrk)
1246 u32 thread_index, *pending_acks;
1247 tcp_connection_t *tc;
1250 if (!vec_len (wrk->pending_acks))
1253 thread_index = wrk->vm->thread_index;
1254 pending_acks = wrk->pending_acks;
1255 for (i = 0; i < vec_len (pending_acks); i++)
1257 tc = tcp_connection_get (pending_acks[i], thread_index);
1258 tc->flags &= ~TCP_CONN_SNDACK;
1259 if (!tc->pending_dupacks)
1265 /* If we're supposed to send dupacks but have no ooo data
1266 * send only one ack */
1267 if (!vec_len (tc->snd_sacks))
1273 /* Start with first sack block */
1274 tc->snd_sack_pos = 0;
1276 /* Generate enough dupacks to cover all sack blocks. Do not generate
1277 * more sacks than the number of packets received. But do generate at
1278 * least 3, i.e., the number needed to signal congestion, if needed. */
1279 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1280 n_acks = clib_min (n_acks, tc->pending_dupacks);
1281 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1282 for (j = 0; j < n_acks; j++)
1285 tc->pending_dupacks = 0;
1286 tc->snd_sack_pos = 0;
1288 _vec_len (wrk->pending_acks) = 0;
1292 * Delayed ack timer handler
1294 * Sends delayed ACK when timer expires
1297 tcp_timer_delack_handler (u32 index)
1299 u32 thread_index = vlib_get_thread_index ();
1300 tcp_connection_t *tc;
1302 tc = tcp_connection_get (index, thread_index);
1303 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1308 * Allocate a new buffer and build a new tcp segment
1310 * @param wrk tcp worker
1311 * @param tc connection for which the segment will be allocated
1312 * @param offset offset of the first byte in the tx fifo
1313 * @param max_deq_byte segment size
1314 * @param[out] b pointer to buffer allocated
1316 * @return the number of bytes in the segment or 0 if buffer cannot be
1317 * allocated or no data available
1320 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1321 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1323 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1324 vlib_main_t *vm = wrk->vm;
1329 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1334 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1337 * Allocate and fill in buffer(s)
1340 /* Easy case, buffer size greater than mss */
1341 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1343 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1345 *b = vlib_get_buffer (vm, bi);
1346 data = tcp_init_buffer (vm, *b);
1347 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1349 ASSERT (n_bytes == max_deq_bytes);
1350 b[0]->current_length = n_bytes;
1351 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1352 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1353 tc->snd_una_max = tc->snd_nxt;
1355 /* Split mss into multiple buffers */
1358 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1359 u16 n_peeked, len_to_deq;
1360 vlib_buffer_t *chain_b, *prev_b;
1363 /* Make sure we have enough buffers */
1364 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1365 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1366 CLIB_CACHE_LINE_BYTES);
1367 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1368 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1371 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1375 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1376 data = tcp_init_buffer (vm, *b);
1377 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1379 TRANSPORT_MAX_HDRS_LEN);
1380 b[0]->current_length = n_bytes;
1381 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1382 b[0]->total_length_not_including_first_buffer = 0;
1383 max_deq_bytes -= n_bytes;
1386 for (i = 1; i < n_bufs_per_seg; i++)
1389 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1390 chain_bi = wrk->tx_buffers[--n_bufs];
1391 chain_b = vlib_get_buffer (vm, chain_bi);
1392 chain_b->current_data = 0;
1393 data = vlib_buffer_get_current (chain_b);
1394 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1397 ASSERT (n_peeked == len_to_deq);
1398 n_bytes += n_peeked;
1399 chain_b->current_length = n_peeked;
1400 chain_b->next_buffer = 0;
1402 /* update previous buffer */
1403 prev_b->next_buffer = chain_bi;
1404 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1406 max_deq_bytes -= n_peeked;
1407 b[0]->total_length_not_including_first_buffer += n_peeked;
1410 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1411 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1412 tc->snd_una_max = tc->snd_nxt;
1414 if (PREDICT_FALSE (n_bufs))
1416 clib_warning ("not all buffers consumed");
1417 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1421 ASSERT (n_bytes > 0);
1422 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1428 * Build a retransmit segment
1430 * @return the number of bytes in the segment or 0 if there's nothing to
1434 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1435 tcp_connection_t * tc, u32 offset,
1436 u32 max_deq_bytes, vlib_buffer_t ** b)
1438 u32 start, available_bytes;
1441 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1442 ASSERT (max_deq_bytes != 0);
1445 * Make sure we can retransmit something
1447 available_bytes = transport_max_tx_dequeue (&tc->connection);
1448 ASSERT (available_bytes >= offset);
1449 available_bytes -= offset;
1450 if (!available_bytes)
1453 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1454 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1456 /* Start is beyond snd_congestion */
1457 start = tc->snd_una + offset;
1458 if (seq_geq (start, tc->snd_congestion))
1461 /* Don't overshoot snd_congestion */
1462 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1464 max_deq_bytes = tc->snd_congestion - start;
1465 if (max_deq_bytes == 0)
1469 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1473 if (tcp_in_fastrecovery (tc))
1474 tc->snd_rxt_bytes += n_bytes;
1477 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1482 * Reset congestion control, switch cwnd to loss window and try again.
1485 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1487 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1488 tc->prev_ssthresh = tc->ssthresh;
1489 tc->prev_cwnd = tc->cwnd;
1491 /* Cleanly recover cc (also clears up fast retransmit) */
1492 if (tcp_in_fastrecovery (tc))
1494 /* TODO be less aggressive about this */
1495 scoreboard_clear (&tc->sack_sb);
1496 tcp_cc_fastrecovery_exit (tc);
1499 tc->rcv_dupacks = 0;
1501 /* Start again from the beginning */
1502 tc->cc_algo->congestion (tc);
1503 tc->cwnd = tcp_loss_wnd (tc);
1504 tc->snd_congestion = tc->snd_una_max;
1506 tc->cwnd_acc_bytes = 0;
1507 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1508 tcp_recovery_on (tc);
1512 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1514 u32 thread_index = vlib_get_thread_index ();
1515 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1516 vlib_main_t *vm = wrk->vm;
1517 tcp_connection_t *tc;
1518 vlib_buffer_t *b = 0;
1523 tc = tcp_half_open_connection_get (index);
1524 /* Note: the connection may have transitioned to ESTABLISHED... */
1525 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1527 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1531 tc = tcp_connection_get (index, thread_index);
1532 /* Note: the connection may have been closed and pool_put */
1533 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1535 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1536 /* Wait-close and retransmit could pop at the same time */
1537 if (tc->state == TCP_STATE_CLOSED)
1541 if (tc->state >= TCP_STATE_ESTABLISHED)
1543 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1545 /* Lost FIN, retransmit and return */
1546 if (tc->flags & TCP_CONN_FINSNT)
1550 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1554 /* Shouldn't be here. This condition is tricky because it has to take
1555 * into account boff > 0 due to persist timeout. */
1556 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1557 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1558 && !tcp_flight_size (tc)))
1560 ASSERT (!tcp_in_recovery (tc));
1565 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1566 * to persist timer timeout */
1567 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1570 tcp_update_rto (tc);
1573 /* Increment RTO backoff (also equal to number of retries) and go back
1574 * to first un-acked byte */
1577 /* First retransmit timeout */
1578 if (tc->rto_boff == 1)
1579 tcp_rxt_timeout_cc (tc);
1581 scoreboard_clear (&tc->sack_sb);
1583 /* If we've sent beyond snd_congestion, update it */
1584 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1585 tc->snd_congestion = tc->snd_una_max;
1587 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1588 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1590 /* Send one segment. Note that n_bytes may be zero due to buffer
1592 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1595 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1599 bi = vlib_get_buffer_index (vm, b);
1601 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1602 if (tc->rto_boff == 1)
1603 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1605 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1606 tcp_retransmit_timer_force_update (tc);
1608 /* Retransmit for SYN */
1609 else if (tc->state == TCP_STATE_SYN_SENT)
1611 /* Half-open connection actually moved to established but we were
1612 * waiting for syn retransmit to pop to call cleanup from the right
1614 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1616 if (tcp_half_open_connection_cleanup (tc))
1617 TCP_DBG ("could not remove half-open connection");
1621 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1623 /* Try without increasing RTO a number of times. If this fails,
1624 * start growing RTO exponentially */
1626 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1627 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1629 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1630 tc->rto * TCP_TO_TIMER_TICK);
1632 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1634 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1638 b = vlib_get_buffer (vm, bi);
1639 tcp_init_buffer (vm, b);
1640 tcp_make_syn (tc, b);
1643 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1645 /* This goes straight to ipx_lookup. Retransmit timer set already */
1646 tcp_push_ip_hdr (wrk, tc, b);
1647 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1649 /* Retransmit SYN-ACK */
1650 else if (tc->state == TCP_STATE_SYN_RCVD)
1652 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1655 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1656 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1659 tcp_retransmit_timer_force_update (tc);
1661 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1663 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1667 b = vlib_get_buffer (vm, bi);
1668 tcp_init_buffer (vm, b);
1669 tcp_make_synack (tc, b);
1670 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1672 /* Retransmit timer already updated, just enqueue to output */
1673 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1677 ASSERT (tc->state == TCP_STATE_CLOSED);
1683 tcp_timer_retransmit_handler (u32 index)
1685 tcp_timer_retransmit_handler_i (index, 0);
1689 tcp_timer_retransmit_syn_handler (u32 index)
1691 tcp_timer_retransmit_handler_i (index, 1);
1695 * Got 0 snd_wnd from peer, try to do something about it.
1699 tcp_timer_persist_handler (u32 index)
1701 u32 thread_index = vlib_get_thread_index ();
1702 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1703 u32 bi, max_snd_bytes, available_bytes, offset;
1704 tcp_main_t *tm = vnet_get_tcp_main ();
1705 vlib_main_t *vm = wrk->vm;
1706 tcp_connection_t *tc;
1711 tc = tcp_connection_get_if_valid (index, thread_index);
1716 /* Make sure timer handle is set to invalid */
1717 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1719 /* Problem already solved or worse */
1720 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1721 || tc->snd_wnd > tc->snd_mss)
1724 available_bytes = transport_max_tx_dequeue (&tc->connection);
1725 offset = tc->snd_una_max - tc->snd_una;
1727 /* Reprogram persist if no new bytes available to send. We may have data
1729 if (!available_bytes)
1731 tcp_persist_timer_set (tc);
1735 if (available_bytes <= offset)
1737 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1741 /* Increment RTO backoff */
1743 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1746 * Try to force the first unsent segment (or buffer)
1748 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1750 tcp_persist_timer_set (tc);
1753 b = vlib_get_buffer (vm, bi);
1754 data = tcp_init_buffer (vm, b);
1756 tcp_validate_txf_size (tc, offset);
1757 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1759 clib_min (tc->snd_mss, tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1761 session_tx_fifo_peek_bytes (&tc->connection, data, offset, max_snd_bytes);
1762 b->current_length = n_bytes;
1763 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1764 || tc->snd_nxt == tc->snd_una_max
1765 || tc->rto_boff > 1));
1767 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1768 tc->snd_una_max = tc->snd_nxt;
1769 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1770 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1772 /* Just sent new data, enable retransmit */
1773 tcp_retransmit_timer_update (tc);
1777 * Retransmit first unacked segment
1780 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1782 u32 bi, old_snd_nxt, n_bytes;
1783 vlib_main_t *vm = wrk->vm;
1786 old_snd_nxt = tc->snd_nxt;
1787 tc->snd_nxt = tc->snd_una;
1789 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1791 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1795 bi = vlib_get_buffer_index (vm, b);
1796 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1797 tc->snd_nxt = old_snd_nxt;
1803 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1806 u32 offset, n_segs = 0, n_written, bi;
1807 vlib_main_t *vm = wrk->vm;
1808 vlib_buffer_t *b = 0;
1810 tc->snd_nxt = tc->snd_una_max;
1811 offset = tc->snd_una_max - tc->snd_una;
1812 while (n_segs < burst_size)
1814 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1818 bi = vlib_get_buffer_index (vm, b);
1819 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1820 offset += n_written;
1828 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1829 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1830 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1833 * Do fast retransmit with SACKs
1836 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1839 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1840 sack_scoreboard_hole_t *hole;
1841 vlib_main_t *vm = wrk->vm;
1842 vlib_buffer_t *b = 0;
1843 sack_scoreboard_t *sb;
1844 u32 bi, old_snd_nxt;
1847 u8 snd_limited = 0, can_rescue = 0;
1849 ASSERT (tcp_in_fastrecovery (tc));
1851 snd_space = tcp_available_cc_snd_space (tc);
1852 if (snd_space < tc->snd_mss)
1854 tcp_program_fastretransmit (wrk, tc);
1858 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1859 old_snd_nxt = tc->snd_nxt;
1861 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1863 max_deq = transport_max_tx_dequeue (&tc->connection);
1864 max_deq -= tc->snd_una_max - tc->snd_una;
1866 while (snd_space > 0 && n_segs < burst_size)
1868 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1874 snd_space = clib_min (max_deq, snd_space);
1875 burst_size = clib_min (burst_size - n_segs,
1876 snd_space / tc->snd_mss);
1877 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1878 if (max_deq > n_segs_now * tc->snd_mss)
1879 tcp_program_fastretransmit (wrk, tc);
1880 n_segs += n_segs_now;
1884 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1887 /* If rescue rxt undefined or less than snd_una then one segment of
1888 * up to SMSS octets that MUST include the highest outstanding
1889 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1890 * RecoveryPoint. HighRxt MUST NOT be updated.
1892 max_bytes = clib_min (tc->snd_mss,
1893 tc->snd_congestion - tc->snd_una);
1894 max_bytes = clib_min (max_bytes, snd_space);
1895 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1896 sb->rescue_rxt = tc->snd_congestion;
1897 tc->snd_nxt = tc->snd_una + offset;
1898 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1903 bi = vlib_get_buffer_index (vm, b);
1904 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1909 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1910 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1914 offset = sb->high_rxt - tc->snd_una;
1915 tc->snd_nxt = sb->high_rxt;
1916 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1918 ASSERT (n_written <= snd_space);
1920 /* Nothing left to retransmit */
1924 bi = vlib_get_buffer_index (vm, b);
1925 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1927 sb->high_rxt += n_written;
1928 snd_space -= n_written;
1933 tcp_program_fastretransmit (wrk, tc);
1936 /* If window allows, send 1 SMSS of new data */
1937 tc->snd_nxt = old_snd_nxt;
1942 * Fast retransmit without SACK info
1945 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1948 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1949 vlib_main_t *vm = wrk->vm;
1950 int snd_space, n_segs = 0;
1953 ASSERT (tcp_in_fastrecovery (tc));
1954 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1955 old_snd_nxt = tc->snd_nxt;
1957 if (!tcp_fastrecovery_first (tc))
1960 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1962 snd_space = tc->sack_sb.last_bytes_delivered;
1963 tc->snd_nxt = tc->snd_una;
1964 while (snd_space > 0 && n_segs < burst_size)
1966 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1969 /* Nothing left to retransmit */
1973 bi = vlib_get_buffer_index (vm, b);
1974 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1975 snd_space -= n_written;
1976 offset += n_written;
1980 if (n_segs == burst_size)
1985 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1986 snd_space = tcp_available_cc_snd_space (tc);
1987 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1990 max_deq = transport_max_tx_dequeue (&tc->connection);
1991 max_deq -= tc->snd_una_max - tc->snd_una;
1994 snd_space = clib_min (max_deq, snd_space);
1995 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1996 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1997 if (max_deq > n_segs_now * tc->snd_mss)
1998 tcp_program_fastretransmit (wrk, tc);
1999 n_segs += n_segs_now;
2002 /* Restore snd_nxt */
2003 tc->snd_nxt = old_snd_nxt;
2006 tcp_fastrecovery_first_off (tc);
2011 * Do fast retransmit
2014 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2017 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2018 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2020 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2022 #endif /* CLIB_MARCH_VARIANT */
2025 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2026 u16 * next0, u32 * error0)
2028 ip_adjacency_t *adj;
2031 /* Not thread safe but as long as the connection exists the adj should
2033 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2035 if (ai == ADJ_INDEX_INVALID)
2037 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2038 *next0 = TCP_OUTPUT_NEXT_DROP;
2039 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2044 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2045 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2046 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2047 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2050 *next0 = TCP_OUTPUT_NEXT_DROP;
2051 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2053 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2057 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2058 u32 * to_next, u32 n_bufs)
2060 u32 n_trace = vlib_get_trace_count (vm, node);
2061 tcp_connection_t *tc;
2067 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2069 b = vlib_get_buffer (vm, to_next[i]);
2070 th = vlib_buffer_get_current (b);
2071 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2073 t = vlib_add_trace (vm, node, b, sizeof (*t));
2074 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2075 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2080 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2081 tcp_connection_t * tc0, u8 is_ip4)
2083 tcp_header_t *th0 = 0;
2085 th0 = vlib_buffer_get_current (b0);
2086 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2089 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2090 IP_PROTOCOL_TCP, 1);
2091 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2092 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2098 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2099 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2100 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2101 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2102 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2108 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2109 u32 * error0, u16 * next0, u8 is_ip4)
2112 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2114 *error0 = TCP_ERROR_INVALID_CONNECTION;
2115 *next0 = TCP_OUTPUT_NEXT_DROP;
2119 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2120 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2124 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2125 tcp_output_handle_link_local (tc0, b0, next0, error0);
2128 if (!TCP_ALWAYS_ACK)
2129 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2133 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2134 vlib_frame_t * frame, int is_ip4)
2136 u32 n_left_from, *from, thread_index = vm->thread_index;
2137 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2138 u16 nexts[VLIB_FRAME_SIZE], *next;
2140 from = vlib_frame_vector_args (frame);
2141 n_left_from = frame->n_vectors;
2142 tcp_set_time_now (tcp_get_worker (thread_index));
2144 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2145 tcp46_output_trace_frame (vm, node, from, n_left_from);
2147 vlib_get_buffers (vm, from, bufs, n_left_from);
2151 while (n_left_from >= 4)
2153 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2154 tcp_connection_t *tc0, *tc1;
2157 vlib_prefetch_buffer_header (b[2], STORE);
2158 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2160 vlib_prefetch_buffer_header (b[3], STORE);
2161 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2164 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2166 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2168 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2171 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2172 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2174 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2175 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2181 while (n_left_from > 0)
2183 u32 error0 = TCP_ERROR_PKTS_SENT;
2184 tcp_connection_t *tc0;
2186 if (n_left_from > 1)
2188 vlib_prefetch_buffer_header (b[1], STORE);
2189 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2192 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2193 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2196 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2197 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2204 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2205 return frame->n_vectors;
2208 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2209 vlib_frame_t * from_frame)
2211 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2214 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2215 vlib_frame_t * from_frame)
2217 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2221 VLIB_REGISTER_NODE (tcp4_output_node) =
2223 .name = "tcp4-output",
2224 /* Takes a vector of packets. */
2225 .vector_size = sizeof (u32),
2226 .n_errors = TCP_N_ERROR,
2227 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2228 .error_strings = tcp_error_strings,
2229 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2231 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2232 foreach_tcp4_output_next
2235 .format_buffer = format_tcp_header,
2236 .format_trace = format_tcp_tx_trace,
2241 VLIB_REGISTER_NODE (tcp6_output_node) =
2243 .name = "tcp6-output",
2244 /* Takes a vector of packets. */
2245 .vector_size = sizeof (u32),
2246 .n_errors = TCP_N_ERROR,
2247 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2248 .error_strings = tcp_error_strings,
2249 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2251 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2252 foreach_tcp6_output_next
2255 .format_buffer = format_tcp_header,
2256 .format_trace = format_tcp_tx_trace,
2260 typedef enum _tcp_reset_next
2262 TCP_RESET_NEXT_DROP,
2263 TCP_RESET_NEXT_IP_LOOKUP,
2267 #define foreach_tcp4_reset_next \
2268 _(DROP, "error-drop") \
2269 _(IP_LOOKUP, "ip4-lookup")
2271 #define foreach_tcp6_reset_next \
2272 _(DROP, "error-drop") \
2273 _(IP_LOOKUP, "ip6-lookup")
2276 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2277 vlib_frame_t * from_frame, u8 is_ip4)
2279 u32 n_left_from, next_index, *from, *to_next;
2280 u32 my_thread_index = vm->thread_index;
2282 from = vlib_frame_vector_args (from_frame);
2283 n_left_from = from_frame->n_vectors;
2285 next_index = node->cached_next_index;
2287 while (n_left_from > 0)
2291 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2293 while (n_left_from > 0 && n_left_to_next > 0)
2299 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2306 n_left_to_next -= 1;
2308 b0 = vlib_get_buffer (vm, bi0);
2310 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2311 my_thread_index, is_ip4))
2313 error0 = TCP_ERROR_LOOKUP_DROPS;
2314 next0 = TCP_RESET_NEXT_DROP;
2318 /* Prepare to send to IP lookup */
2319 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2320 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2323 b0->error = node->errors[error0];
2324 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2325 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2327 th0 = vlib_buffer_get_current (b0);
2329 th0 = ip4_next_header ((ip4_header_t *) th0);
2331 th0 = ip6_next_header ((ip6_header_t *) th0);
2332 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2333 clib_memcpy_fast (&t0->tcp_header, th0,
2334 sizeof (t0->tcp_header));
2337 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2338 n_left_to_next, bi0, next0);
2340 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2342 return from_frame->n_vectors;
2345 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2346 vlib_frame_t * from_frame)
2348 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2351 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2352 vlib_frame_t * from_frame)
2354 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2358 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2359 .name = "tcp4-reset",
2360 .vector_size = sizeof (u32),
2361 .n_errors = TCP_N_ERROR,
2362 .error_strings = tcp_error_strings,
2363 .n_next_nodes = TCP_RESET_N_NEXT,
2365 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2366 foreach_tcp4_reset_next
2369 .format_trace = format_tcp_tx_trace,
2374 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2375 .name = "tcp6-reset",
2376 .vector_size = sizeof (u32),
2377 .n_errors = TCP_N_ERROR,
2378 .error_strings = tcp_error_strings,
2379 .n_next_nodes = TCP_RESET_N_NEXT,
2381 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2382 foreach_tcp6_reset_next
2385 .format_trace = format_tcp_tx_trace,
2390 * fd.io coding-style-patch-verification: ON
2393 * eval: (c-set-style "gnu")