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;
53 format_tcp_tx_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
58 u32 indent = format_get_indent (s);
60 s = format (s, "%U\n%U%U",
61 format_tcp_header, &t->tcp_header, 128,
62 format_white_space, indent,
63 format_tcp_connection, &t->tcp_connection, 1);
68 #ifndef CLIB_MARCH_VARIANT
70 tcp_window_compute_scale (u32 window)
73 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
79 * Update max segment size we're able to process.
81 * The value is constrained by our interface's MTU and IP options. It is
82 * also what we advertise to our peer.
85 tcp_update_rcv_mss (tcp_connection_t * tc)
87 /* TODO find our iface MTU */
88 tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t);
92 * TCP's initial window
95 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
97 /* RFC 6928 recommends the value lower. However at the time our connections
98 * are initialized, fifos may not be allocated. Therefore, advertise the
99 * smallest possible unscaled window size and update once fifos are
100 * assigned to the session.
103 tcp_update_rcv_mss (tc);
104 TCP_IW_N_SEGMENTS * tc->mss;
106 return TCP_MIN_RX_FIFO_SIZE;
110 * Compute initial window and scale factor. As per RFC1323, window field in
111 * SYN and SYN-ACK segments is never scaled.
114 tcp_initial_window_to_advertise (tcp_connection_t * tc)
116 tcp_main_t *tm = &tcp_main;
119 /* Initial wnd for SYN. Fifos are not allocated yet.
120 * Use some predefined value. For SYN-ACK we still want the
121 * scale to be computed in the same way */
122 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
124 /* Compute rcv wscale only if peer advertised support for it */
125 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
126 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
128 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
130 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
134 tcp_update_rcv_wnd (tcp_connection_t * tc)
136 u32 available_space, wnd;
139 ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection));
142 * Figure out how much space we have available
144 available_space = transport_max_rx_enqueue (&tc->connection);
145 if (PREDICT_FALSE (available_space < tc->rcv_opts.mss))
149 * Use the above and what we know about what we've previously advertised
150 * to compute the new window
152 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
154 /* Bad. Thou shalt not shrink */
155 if (PREDICT_FALSE ((i32) available_space < observed_wnd))
157 wnd = clib_max (observed_wnd, 0);
158 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
162 wnd = available_space;
165 /* Make sure we have a multiple of rcv_wscale */
166 if (wnd && tc->rcv_wscale)
168 wnd &= ~((1 << tc->rcv_wscale) - 1);
170 wnd = 1 << tc->rcv_wscale;
173 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
177 * Compute and return window to advertise, scaled as per RFC1323
180 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
182 if (state < TCP_STATE_ESTABLISHED)
183 return tcp_initial_window_to_advertise (tc);
185 tcp_update_rcv_wnd (tc);
187 if (tc->rcv_wnd == 0)
189 tc->flags |= TCP_CONN_SENT_RCV_WND0;
193 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
196 return tc->rcv_wnd >> tc->rcv_wscale;
200 * Write TCP options to segment.
203 tcp_options_write (u8 * data, tcp_options_t * opts)
206 u32 buf, seq_len = 4;
208 if (tcp_opts_mss (opts))
210 *data++ = TCP_OPTION_MSS;
211 *data++ = TCP_OPTION_LEN_MSS;
212 buf = clib_host_to_net_u16 (opts->mss);
213 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
214 data += sizeof (opts->mss);
215 opts_len += TCP_OPTION_LEN_MSS;
218 if (tcp_opts_wscale (opts))
220 *data++ = TCP_OPTION_WINDOW_SCALE;
221 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
222 *data++ = opts->wscale;
223 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
226 if (tcp_opts_sack_permitted (opts))
228 *data++ = TCP_OPTION_SACK_PERMITTED;
229 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
230 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
233 if (tcp_opts_tstamp (opts))
235 *data++ = TCP_OPTION_TIMESTAMP;
236 *data++ = TCP_OPTION_LEN_TIMESTAMP;
237 buf = clib_host_to_net_u32 (opts->tsval);
238 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
239 data += sizeof (opts->tsval);
240 buf = clib_host_to_net_u32 (opts->tsecr);
241 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
242 data += sizeof (opts->tsecr);
243 opts_len += TCP_OPTION_LEN_TIMESTAMP;
246 if (tcp_opts_sack (opts))
250 if (opts->n_sack_blocks != 0)
252 *data++ = TCP_OPTION_SACK_BLOCK;
253 *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
254 for (i = 0; i < opts->n_sack_blocks; i++)
256 buf = clib_host_to_net_u32 (opts->sacks[i].start);
257 clib_memcpy_fast (data, &buf, seq_len);
259 buf = clib_host_to_net_u32 (opts->sacks[i].end);
260 clib_memcpy_fast (data, &buf, seq_len);
263 opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
267 /* Terminate TCP options */
270 *data++ = TCP_OPTION_EOL;
271 opts_len += TCP_OPTION_LEN_EOL;
274 /* Pad with zeroes to a u32 boundary */
277 *data++ = TCP_OPTION_NOOP;
278 opts_len += TCP_OPTION_LEN_NOOP;
284 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
288 opts->flags |= TCP_OPTS_FLAG_MSS;
289 opts->mss = tcp_main.default_mtu; /*XXX discover that */
290 len += TCP_OPTION_LEN_MSS;
292 opts->flags |= TCP_OPTS_FLAG_WSCALE;
293 opts->wscale = wnd_scale;
294 len += TCP_OPTION_LEN_WINDOW_SCALE;
296 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
297 opts->tsval = tcp_time_now ();
299 len += TCP_OPTION_LEN_TIMESTAMP;
303 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
304 len += TCP_OPTION_LEN_SACK_PERMITTED;
307 /* Align to needed boundary */
308 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
313 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
317 opts->flags |= TCP_OPTS_FLAG_MSS;
319 len += TCP_OPTION_LEN_MSS;
321 if (tcp_opts_wscale (&tc->rcv_opts))
323 opts->flags |= TCP_OPTS_FLAG_WSCALE;
324 opts->wscale = tc->rcv_wscale;
325 len += TCP_OPTION_LEN_WINDOW_SCALE;
328 if (tcp_opts_tstamp (&tc->rcv_opts))
330 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
331 opts->tsval = tcp_time_now ();
332 opts->tsecr = tc->tsval_recent;
333 len += TCP_OPTION_LEN_TIMESTAMP;
336 if (tcp_opts_sack_permitted (&tc->rcv_opts))
338 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
339 len += TCP_OPTION_LEN_SACK_PERMITTED;
342 /* Align to needed boundary */
343 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
348 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
354 if (tcp_opts_tstamp (&tc->rcv_opts))
356 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
357 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
358 opts->tsecr = tc->tsval_recent;
359 len += TCP_OPTION_LEN_TIMESTAMP;
361 if (tcp_opts_sack_permitted (&tc->rcv_opts))
363 if (vec_len (tc->snd_sacks))
365 opts->flags |= TCP_OPTS_FLAG_SACK;
366 if (tc->snd_sack_pos >= vec_len (tc->snd_sacks))
367 tc->snd_sack_pos = 0;
368 opts->sacks = &tc->snd_sacks[tc->snd_sack_pos];
369 opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos;
370 opts->n_sack_blocks = clib_min (opts->n_sack_blocks,
371 TCP_OPTS_MAX_SACK_BLOCKS);
372 tc->snd_sack_pos += opts->n_sack_blocks;
373 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
377 /* Align to needed boundary */
378 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
383 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
388 case TCP_STATE_ESTABLISHED:
389 case TCP_STATE_CLOSE_WAIT:
390 case TCP_STATE_FIN_WAIT_1:
391 case TCP_STATE_LAST_ACK:
392 case TCP_STATE_CLOSING:
393 case TCP_STATE_FIN_WAIT_2:
394 case TCP_STATE_TIME_WAIT:
395 case TCP_STATE_CLOSED:
396 return tcp_make_established_options (tc, opts);
397 case TCP_STATE_SYN_RCVD:
398 return tcp_make_synack_options (tc, opts);
399 case TCP_STATE_SYN_SENT:
400 return tcp_make_syn_options (opts, tc->rcv_wscale);
402 clib_warning ("State not handled! %d", state);
408 * Update burst send vars
410 * - Updates snd_mss to reflect the effective segment size that we can send
411 * by taking into account all TCP options, including SACKs.
412 * - Cache 'on the wire' options for reuse
413 * - Updates receive window which can be reused for a burst.
415 * This should *only* be called when doing bursts
418 tcp_update_burst_snd_vars (tcp_connection_t * tc)
420 tcp_main_t *tm = &tcp_main;
422 /* Compute options to be used for connection. These may be reused when
423 * sending data or to compute the effective mss (snd_mss) */
424 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
425 TCP_STATE_ESTABLISHED);
427 /* XXX check if MTU has been updated */
428 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
429 ASSERT (tc->snd_mss > 0);
431 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
434 tcp_update_rcv_wnd (tc);
438 tcp_init_mss (tcp_connection_t * tc)
440 u16 default_min_mss = 536;
441 tcp_update_rcv_mss (tc);
443 /* TODO cache mss and consider PMTU discovery */
444 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
446 if (tc->snd_mss < 45)
448 /* Assume that at least the min default mss works */
449 tc->snd_mss = default_min_mss;
450 tc->rcv_opts.mss = default_min_mss;
453 /* We should have enough space for 40 bytes of options */
454 ASSERT (tc->snd_mss > 45);
456 /* If we use timestamp option, account for it */
457 if (tcp_opts_tstamp (&tc->rcv_opts))
458 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
460 #endif /* CLIB_MARCH_VARIANT */
463 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
465 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
466 vlib_buffer_free_one (vm, b->next_buffer);
467 /* Zero all flags but free list index and trace flag */
468 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
470 b->current_length = 0;
471 b->total_length_not_including_first_buffer = 0;
472 vnet_buffer (b)->tcp.flags = 0;
474 /* Leave enough space for headers */
475 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
478 #ifndef CLIB_MARCH_VARIANT
480 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
482 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
483 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
484 b->total_length_not_including_first_buffer = 0;
486 vnet_buffer (b)->tcp.flags = 0;
487 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
488 /* Leave enough space for headers */
489 return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
496 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
499 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
500 u8 tcp_opts_len, tcp_hdr_opts_len;
504 wnd = tcp_window_to_advertise (tc, state);
506 /* Make and write options */
507 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
508 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
510 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
511 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
513 tcp_options_write ((u8 *) (th + 1), snd_opts);
514 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
518 * Convert buffer to ACK
521 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
523 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
524 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
525 tc->rcv_las = tc->rcv_nxt;
529 * Convert buffer to FIN-ACK
532 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
534 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
538 * Convert buffer to SYN
541 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
543 u8 tcp_hdr_opts_len, tcp_opts_len;
546 tcp_options_t snd_opts;
548 initial_wnd = tcp_initial_window_to_advertise (tc);
550 /* Make and write options */
551 clib_memset (&snd_opts, 0, sizeof (snd_opts));
552 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
553 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
555 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
556 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
558 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
559 tcp_options_write ((u8 *) (th + 1), &snd_opts);
563 * Convert buffer to SYN-ACK
566 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
568 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
569 u8 tcp_opts_len, tcp_hdr_opts_len;
573 clib_memset (snd_opts, 0, sizeof (*snd_opts));
574 initial_wnd = tcp_initial_window_to_advertise (tc);
575 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
576 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
578 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
579 tc->rcv_nxt, tcp_hdr_opts_len,
580 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
581 tcp_options_write ((u8 *) (th + 1), snd_opts);
583 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
587 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
588 u8 is_ip4, u32 fib_index, u8 flush)
590 vlib_main_t *vm = wrk->vm;
591 u32 *to_next, next_index;
594 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
597 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
598 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
600 /* Send to IP lookup */
601 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
602 tcp_trajectory_add_start (b, 1);
604 f = wrk->ip_lookup_tx_frames[!is_ip4];
607 f = vlib_get_frame_to_node (vm, next_index);
609 wrk->ip_lookup_tx_frames[!is_ip4] = f;
612 to_next = vlib_frame_vector_args (f);
613 to_next[f->n_vectors] = bi;
615 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
617 vlib_put_frame_to_node (vm, next_index, f);
618 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
623 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
624 u32 bi, u8 is_ip4, u32 fib_index)
626 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
630 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
631 u8 is_ip4, u32 fib_index)
633 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
634 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
635 session_flush_frames_main_thread (wrk->vm);
639 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
642 u32 *to_next, next_index;
645 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
648 /* Decide where to send the packet */
649 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
650 tcp_trajectory_add_start (b, 2);
652 /* Get frame to v4/6 output node */
653 f = wrk->tx_frames[!is_ip4];
656 f = vlib_get_frame_to_node (wrk->vm, next_index);
658 wrk->tx_frames[!is_ip4] = f;
660 to_next = vlib_frame_vector_args (f);
661 to_next[f->n_vectors] = bi;
663 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
665 vlib_put_frame_to_node (wrk->vm, next_index, f);
666 wrk->tx_frames[!is_ip4] = 0;
671 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
674 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
678 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
681 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
683 #endif /* CLIB_MARCH_VARIANT */
686 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
687 tcp_state_t state, u8 thread_index, u8 is_ip4)
692 ip4_address_t src_ip40, dst_ip40;
693 ip6_address_t src_ip60, dst_ip60;
694 u16 src_port, dst_port;
699 /* Find IP and TCP headers */
700 th0 = tcp_buffer_hdr (b0);
702 /* Save src and dst ip */
705 ih4 = vlib_buffer_get_current (b0);
706 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
707 src_ip40.as_u32 = ih4->src_address.as_u32;
708 dst_ip40.as_u32 = ih4->dst_address.as_u32;
712 ih6 = vlib_buffer_get_current (b0);
713 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
714 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
715 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
718 src_port = th0->src_port;
719 dst_port = th0->dst_port;
721 /* Try to determine what/why we're actually resetting */
722 if (state == TCP_STATE_CLOSED)
727 tmp = clib_net_to_host_u32 (th0->seq_number);
729 /* Got a SYN for no listener. */
730 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
731 ack = clib_host_to_net_u32 (tmp + 1);
736 flags = TCP_FLAG_RST;
737 seq = th0->ack_number;
741 tcp_reuse_buffer (vm, b0);
742 tcp_trajectory_add_start (b0, 4);
743 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
744 sizeof (tcp_header_t), flags, 0);
748 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
750 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
755 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
757 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
764 #ifndef CLIB_MARCH_VARIANT
766 * Send reset without reusing existing buffer
768 * It extracts connection info out of original packet
771 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
772 u32 thread_index, u8 is_ip4)
774 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
775 vlib_main_t *vm = wrk->vm;
777 u32 bi, sw_if_index, fib_index;
778 u8 tcp_hdr_len, flags = 0;
779 tcp_header_t *th, *pkt_th;
781 ip4_header_t *ih4, *pkt_ih4;
782 ip6_header_t *ih6, *pkt_ih6;
783 fib_protocol_t fib_proto;
785 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
788 b = vlib_get_buffer (vm, bi);
789 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
790 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
791 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
792 tcp_init_buffer (vm, b);
794 /* Make and write options */
795 tcp_hdr_len = sizeof (tcp_header_t);
799 pkt_ih4 = vlib_buffer_get_current (pkt);
800 pkt_th = ip4_next_header (pkt_ih4);
804 pkt_ih6 = vlib_buffer_get_current (pkt);
805 pkt_th = ip6_next_header (pkt_ih6);
808 if (tcp_ack (pkt_th))
810 flags = TCP_FLAG_RST;
811 seq = pkt_th->ack_number;
812 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
816 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
818 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
821 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
822 seq, ack, tcp_hdr_len, flags, 0);
824 /* Swap src and dst ip */
827 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
828 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
829 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
830 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
835 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
837 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
838 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
839 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
843 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
844 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
848 * Build and set reset packet for connection
851 tcp_send_reset (tcp_connection_t * tc)
853 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
854 vlib_main_t *vm = wrk->vm;
858 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
861 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
863 b = vlib_get_buffer (vm, bi);
864 tcp_init_buffer (vm, b);
866 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
867 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
868 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
869 flags = TCP_FLAG_RST;
870 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
871 tc->rcv_nxt, tcp_hdr_opts_len, flags,
873 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
874 ASSERT (opts_write_len == tc->snd_opts_len);
875 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
879 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
880 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
881 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
887 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
888 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
889 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
892 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
893 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
897 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
900 tcp_header_t *th = vlib_buffer_get_current (b);
901 vlib_main_t *vm = wrk->vm;
905 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
906 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
907 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
914 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
915 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
916 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
924 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
925 * The packet is not forwarded through tcpx_output to avoid doing lookups
926 * in the half_open pool.
929 tcp_send_syn (tcp_connection_t * tc)
931 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
932 vlib_main_t *vm = wrk->vm;
937 * Setup retransmit and establish timers before requesting buffer
938 * such that we can return if we've ran out.
940 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
941 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
942 tc->rto * TCP_TO_TIMER_TICK);
944 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
946 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
950 b = vlib_get_buffer (vm, bi);
951 tcp_init_buffer (vm, b);
952 tcp_make_syn (tc, b);
954 /* Measure RTT with this */
955 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
956 tc->rtt_seq = tc->snd_nxt;
959 tcp_push_ip_hdr (wrk, tc, b);
960 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
961 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
965 tcp_send_synack (tcp_connection_t * tc)
967 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
968 vlib_main_t *vm = wrk->vm;
972 tcp_retransmit_timer_force_update (tc);
974 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
976 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
980 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
981 b = vlib_get_buffer (vm, bi);
982 tcp_init_buffer (vm, b);
983 tcp_make_synack (tc, b);
984 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
985 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
989 * Flush tx frame populated by retransmits and timer pops
992 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
994 if (wrk->tx_frames[!is_ip4])
997 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
998 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
999 wrk->tx_frames[!is_ip4] = 0;
1004 * Flush ip lookup tx frames populated by timer pops
1007 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1009 if (wrk->ip_lookup_tx_frames[!is_ip4])
1012 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1013 vlib_put_frame_to_node (wrk->vm, next_index,
1014 wrk->ip_lookup_tx_frames[!is_ip4]);
1015 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1020 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1023 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1025 tcp_flush_frame_to_output (wrk, 1);
1026 tcp_flush_frame_to_output (wrk, 0);
1027 tcp_flush_frame_to_ip_lookup (wrk, 1);
1028 tcp_flush_frame_to_ip_lookup (wrk, 0);
1035 tcp_send_fin (tcp_connection_t * tc)
1037 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1038 vlib_main_t *vm = wrk->vm;
1043 fin_snt = tc->flags & TCP_CONN_FINSNT;
1047 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1049 /* Out of buffers so program fin retransmit ASAP */
1050 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1054 /* Make sure retransmit retries a fin not data */
1055 tc->flags |= TCP_CONN_FINSNT;
1059 tcp_retransmit_timer_force_update (tc);
1060 b = vlib_get_buffer (vm, bi);
1061 tcp_init_buffer (vm, b);
1062 tcp_make_fin (tc, b);
1063 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1064 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1065 /* Account for the FIN */
1069 tc->flags |= TCP_CONN_FINSNT;
1070 tc->flags &= ~TCP_CONN_FINPNDG;
1071 tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt);
1076 * Push TCP header and update connection variables. Should only be called
1077 * for segments with data, not for 'control' packets.
1080 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
1081 u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt)
1083 u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK;
1084 u32 advertise_wnd, data_len;
1085 tcp_main_t *tm = &tcp_main;
1088 data_len = b->current_length;
1089 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1090 data_len += b->total_length_not_including_first_buffer;
1092 vnet_buffer (b)->tcp.flags = 0;
1093 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1096 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1098 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1101 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1103 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
1105 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1107 if (seq_geq (tc->psh_seq, snd_nxt)
1108 && seq_lt (tc->psh_seq, snd_nxt + data_len))
1109 flags |= TCP_FLAG_PSH;
1111 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt,
1112 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1117 clib_memcpy_fast ((u8 *) (th + 1),
1118 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1123 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1124 ASSERT (len == tc->snd_opts_len);
1128 * Update connection variables
1132 tc->snd_nxt += data_len;
1133 tc->rcv_las = tc->rcv_nxt;
1135 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1139 tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1141 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1142 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
1143 /* update_snd_nxt */ 1);
1144 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1145 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1146 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1147 /* If not tracking an ACK, start tracking */
1148 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1150 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1151 tc->rtt_seq = tc->snd_nxt;
1153 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1155 tcp_retransmit_timer_set (tc);
1158 tcp_trajectory_add_start (b, 3);
1163 tcp_send_ack (tcp_connection_t * tc)
1165 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1166 vlib_main_t *vm = wrk->vm;
1170 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1172 tcp_update_rcv_wnd (tc);
1175 b = vlib_get_buffer (vm, bi);
1176 tcp_init_buffer (vm, b);
1177 tcp_make_ack (tc, b);
1178 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1182 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1184 if (!(tc->flags & TCP_CONN_SNDACK))
1186 vec_add1 (wrk->pending_acks, tc->c_c_index);
1187 tc->flags |= TCP_CONN_SNDACK;
1192 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1194 if (!(tc->flags & TCP_CONN_SNDACK))
1196 vec_add1 (wrk->pending_acks, tc->c_c_index);
1197 tc->flags |= TCP_CONN_SNDACK;
1199 if (tc->pending_dupacks < 255)
1200 tc->pending_dupacks += 1;
1204 tcp_send_acks (tcp_worker_ctx_t * wrk)
1206 u32 thread_index, *pending_acks;
1207 tcp_connection_t *tc;
1210 if (!vec_len (wrk->pending_acks))
1213 thread_index = wrk->vm->thread_index;
1214 pending_acks = wrk->pending_acks;
1215 for (i = 0; i < vec_len (pending_acks); i++)
1217 tc = tcp_connection_get (pending_acks[i], thread_index);
1218 tc->flags &= ~TCP_CONN_SNDACK;
1219 if (!tc->pending_dupacks)
1225 /* If we're supposed to send dupacks but have no ooo data
1226 * send only one ack */
1227 if (!vec_len (tc->snd_sacks))
1233 /* Start with first sack block */
1234 tc->snd_sack_pos = 0;
1236 /* Generate enough dupacks to cover all sack blocks. Do not generate
1237 * more sacks than the number of packets received. But do generate at
1238 * least 3, i.e., the number needed to signal congestion, if needed. */
1239 n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS;
1240 n_acks = clib_min (n_acks, tc->pending_dupacks);
1241 n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3));
1242 for (j = 0; j < n_acks; j++)
1245 tc->pending_dupacks = 0;
1246 tc->snd_sack_pos = 0;
1248 _vec_len (wrk->pending_acks) = 0;
1252 * Delayed ack timer handler
1254 * Sends delayed ACK when timer expires
1257 tcp_timer_delack_handler (u32 index)
1259 u32 thread_index = vlib_get_thread_index ();
1260 tcp_connection_t *tc;
1262 tc = tcp_connection_get (index, thread_index);
1263 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1268 * Allocate a new buffer and build a new tcp segment
1270 * @param wrk tcp worker
1271 * @param tc connection for which the segment will be allocated
1272 * @param offset offset of the first byte in the tx fifo
1273 * @param max_deq_byte segment size
1274 * @param[out] b pointer to buffer allocated
1276 * @return the number of bytes in the segment or 0 if buffer cannot be
1277 * allocated or no data available
1280 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1281 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1283 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1284 vlib_main_t *vm = wrk->vm;
1289 seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN;
1294 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1297 * Allocate and fill in buffer(s)
1300 /* Easy case, buffer size greater than mss */
1301 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1303 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1305 *b = vlib_get_buffer (vm, bi);
1306 data = tcp_init_buffer (vm, *b);
1307 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1309 ASSERT (n_bytes == max_deq_bytes);
1310 b[0]->current_length = n_bytes;
1311 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1312 /* burst */ 0, /* update_snd_nxt */ 0);
1314 /* Split mss into multiple buffers */
1317 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1318 u16 n_peeked, len_to_deq;
1319 vlib_buffer_t *chain_b, *prev_b;
1322 /* Make sure we have enough buffers */
1323 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1324 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1325 CLIB_CACHE_LINE_BYTES);
1326 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1327 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1330 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1334 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1335 data = tcp_init_buffer (vm, *b);
1336 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1338 TRANSPORT_MAX_HDRS_LEN);
1339 b[0]->current_length = n_bytes;
1340 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1341 b[0]->total_length_not_including_first_buffer = 0;
1342 max_deq_bytes -= n_bytes;
1345 for (i = 1; i < n_bufs_per_seg; i++)
1348 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1349 chain_bi = wrk->tx_buffers[--n_bufs];
1350 chain_b = vlib_get_buffer (vm, chain_bi);
1351 chain_b->current_data = 0;
1352 data = vlib_buffer_get_current (chain_b);
1353 n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data,
1356 ASSERT (n_peeked == len_to_deq);
1357 n_bytes += n_peeked;
1358 chain_b->current_length = n_peeked;
1359 chain_b->next_buffer = 0;
1361 /* update previous buffer */
1362 prev_b->next_buffer = chain_bi;
1363 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1365 max_deq_bytes -= n_peeked;
1366 b[0]->total_length_not_including_first_buffer += n_peeked;
1369 tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0,
1370 /* burst */ 0, /* update_snd_nxt */ 0);
1372 if (PREDICT_FALSE (n_bufs))
1374 clib_warning ("not all buffers consumed");
1375 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1379 ASSERT (n_bytes > 0);
1380 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1386 * Build a retransmit segment
1388 * @return the number of bytes in the segment or 0 if there's nothing to
1392 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1393 tcp_connection_t * tc, u32 offset,
1394 u32 max_deq_bytes, vlib_buffer_t ** b)
1396 u32 start, available_bytes;
1399 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1400 ASSERT (max_deq_bytes != 0);
1403 * Make sure we can retransmit something
1405 available_bytes = transport_max_tx_dequeue (&tc->connection);
1406 ASSERT (available_bytes >= offset);
1407 available_bytes -= offset;
1408 if (!available_bytes)
1411 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1412 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1414 /* Start is beyond snd_congestion */
1415 start = tc->snd_una + offset;
1416 if (seq_geq (start, tc->snd_congestion))
1419 /* Don't overshoot snd_congestion */
1420 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1422 max_deq_bytes = tc->snd_congestion - start;
1423 if (max_deq_bytes == 0)
1427 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1431 if (tcp_in_fastrecovery (tc))
1432 tc->snd_rxt_bytes += n_bytes;
1435 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1440 * Reset congestion control, switch cwnd to loss window and try again.
1443 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1445 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1446 tc->prev_ssthresh = tc->ssthresh;
1447 tc->prev_cwnd = tc->cwnd;
1449 /* Cleanly recover cc (also clears up fast retransmit) */
1450 if (tcp_in_fastrecovery (tc))
1452 /* TODO be less aggressive about this */
1453 scoreboard_clear (&tc->sack_sb);
1454 tcp_cc_fastrecovery_exit (tc);
1457 tc->rcv_dupacks = 0;
1459 /* Start again from the beginning */
1460 tc->cc_algo->congestion (tc);
1461 tc->cwnd = tcp_loss_wnd (tc);
1462 tc->snd_congestion = tc->snd_nxt;
1464 tc->cwnd_acc_bytes = 0;
1465 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1466 tcp_recovery_on (tc);
1470 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1472 u32 thread_index = vlib_get_thread_index ();
1473 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1474 vlib_main_t *vm = wrk->vm;
1475 tcp_connection_t *tc;
1476 vlib_buffer_t *b = 0;
1481 tc = tcp_half_open_connection_get (index);
1482 /* Note: the connection may have transitioned to ESTABLISHED... */
1483 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1485 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1489 tc = tcp_connection_get (index, thread_index);
1490 /* Note: the connection may have been closed and pool_put */
1491 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1493 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1494 /* Wait-close and retransmit could pop at the same time */
1495 if (tc->state == TCP_STATE_CLOSED)
1499 if (tc->state >= TCP_STATE_ESTABLISHED)
1501 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1503 /* Lost FIN, retransmit and return */
1504 if (tc->flags & TCP_CONN_FINSNT)
1508 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1512 /* Shouldn't be here. This condition is tricky because it has to take
1513 * into account boff > 0 due to persist timeout. */
1514 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt)
1515 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1516 && !tcp_flight_size (tc)))
1518 ASSERT (!tcp_in_recovery (tc));
1523 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1524 * to persist timer timeout */
1525 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1528 tcp_update_rto (tc);
1531 /* Increment RTO backoff (also equal to number of retries) and go back
1532 * to first un-acked byte */
1535 /* First retransmit timeout */
1536 if (tc->rto_boff == 1)
1537 tcp_rxt_timeout_cc (tc);
1539 scoreboard_clear (&tc->sack_sb);
1541 /* If we've sent beyond snd_congestion, update it */
1542 tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
1544 tc->snd_nxt = tc->snd_una;
1545 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1547 /* Send one segment. Note that n_bytes may be zero due to buffer
1549 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1552 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1556 bi = vlib_get_buffer_index (vm, b);
1558 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1559 if (tc->rto_boff == 1)
1560 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1562 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1563 tcp_retransmit_timer_force_update (tc);
1565 /* Retransmit for SYN */
1566 else if (tc->state == TCP_STATE_SYN_SENT)
1568 /* Half-open connection actually moved to established but we were
1569 * waiting for syn retransmit to pop to call cleanup from the right
1571 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1573 if (tcp_half_open_connection_cleanup (tc))
1574 TCP_DBG ("could not remove half-open connection");
1578 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1580 /* Try without increasing RTO a number of times. If this fails,
1581 * start growing RTO exponentially */
1583 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1584 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1586 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1587 tc->rto * TCP_TO_TIMER_TICK);
1589 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1591 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
1595 b = vlib_get_buffer (vm, bi);
1596 tcp_init_buffer (vm, b);
1597 tcp_make_syn (tc, b);
1600 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1602 /* This goes straight to ipx_lookup. Retransmit timer set already */
1603 tcp_push_ip_hdr (wrk, tc, b);
1604 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1606 /* Retransmit SYN-ACK */
1607 else if (tc->state == TCP_STATE_SYN_RCVD)
1609 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1612 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1613 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1616 tcp_retransmit_timer_force_update (tc);
1618 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1620 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1624 b = vlib_get_buffer (vm, bi);
1625 tcp_init_buffer (vm, b);
1626 tcp_make_synack (tc, b);
1627 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1629 /* Retransmit timer already updated, just enqueue to output */
1630 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1634 ASSERT (tc->state == TCP_STATE_CLOSED);
1640 tcp_timer_retransmit_handler (u32 index)
1642 tcp_timer_retransmit_handler_i (index, 0);
1646 tcp_timer_retransmit_syn_handler (u32 index)
1648 tcp_timer_retransmit_handler_i (index, 1);
1652 * Got 0 snd_wnd from peer, try to do something about it.
1656 tcp_timer_persist_handler (u32 index)
1658 u32 thread_index = vlib_get_thread_index ();
1659 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1660 u32 bi, max_snd_bytes, available_bytes, offset;
1661 tcp_main_t *tm = vnet_get_tcp_main ();
1662 vlib_main_t *vm = wrk->vm;
1663 tcp_connection_t *tc;
1668 tc = tcp_connection_get_if_valid (index, thread_index);
1672 /* Make sure timer handle is set to invalid */
1673 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1675 /* Problem already solved or worse */
1676 if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
1677 || (tc->flags & TCP_CONN_FINSNT))
1680 available_bytes = transport_max_tx_dequeue (&tc->connection);
1681 offset = tc->snd_nxt - tc->snd_una;
1683 /* Reprogram persist if no new bytes available to send. We may have data
1685 if (!available_bytes)
1687 tcp_persist_timer_set (tc);
1691 if (available_bytes <= offset)
1693 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1697 /* Increment RTO backoff */
1699 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1702 * Try to force the first unsent segment (or buffer)
1704 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1706 tcp_persist_timer_set (tc);
1709 b = vlib_get_buffer (vm, bi);
1710 data = tcp_init_buffer (vm, b);
1712 tcp_validate_txf_size (tc, offset);
1713 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1714 max_snd_bytes = clib_min (tc->snd_mss,
1715 tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN);
1716 n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset,
1718 b->current_length = n_bytes;
1719 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1720 || tc->snd_nxt == tc->snd_una_max
1721 || tc->rto_boff > 1));
1723 tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
1724 /* burst */ 0, /* update_snd_nxt */ 1);
1725 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1726 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1727 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1729 /* Just sent new data, enable retransmit */
1730 tcp_retransmit_timer_update (tc);
1734 * Retransmit first unacked segment
1737 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1739 vlib_main_t *vm = wrk->vm;
1743 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1745 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1749 bi = vlib_get_buffer_index (vm, b);
1750 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1756 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1759 u32 offset, n_segs = 0, n_written, bi;
1760 vlib_main_t *vm = wrk->vm;
1761 vlib_buffer_t *b = 0;
1763 offset = tc->snd_nxt - tc->snd_una;
1764 while (n_segs < burst_size)
1766 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1770 bi = vlib_get_buffer_index (vm, b);
1771 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1772 offset += n_written;
1775 tc->snd_nxt += n_written;
1776 tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
1783 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1784 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1785 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1788 * Do fast retransmit with SACKs
1791 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1794 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1795 sack_scoreboard_hole_t *hole;
1796 vlib_main_t *vm = wrk->vm;
1797 vlib_buffer_t *b = 0;
1798 sack_scoreboard_t *sb;
1801 u8 snd_limited = 0, can_rescue = 0;
1803 ASSERT (tcp_in_fastrecovery (tc));
1805 snd_space = tcp_available_cc_snd_space (tc);
1806 if (snd_space < tc->snd_mss)
1808 tcp_program_fastretransmit (wrk, tc);
1812 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1814 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1816 max_deq = transport_max_tx_dequeue (&tc->connection);
1817 max_deq -= tc->snd_nxt - tc->snd_una;
1819 while (snd_space > 0 && n_segs < burst_size)
1821 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1827 snd_space = clib_min (max_deq, snd_space);
1828 burst_size = clib_min (burst_size - n_segs,
1829 snd_space / tc->snd_mss);
1830 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1831 if (max_deq > n_segs_now * tc->snd_mss)
1832 tcp_program_fastretransmit (wrk, tc);
1833 n_segs += n_segs_now;
1837 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1840 /* If rescue rxt undefined or less than snd_una then one segment of
1841 * up to SMSS octets that MUST include the highest outstanding
1842 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1843 * RecoveryPoint. HighRxt MUST NOT be updated.
1845 max_bytes = clib_min (tc->snd_mss,
1846 tc->snd_congestion - tc->snd_una);
1847 max_bytes = clib_min (max_bytes, snd_space);
1848 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1849 sb->rescue_rxt = tc->snd_congestion;
1850 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1855 bi = vlib_get_buffer_index (vm, b);
1856 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1861 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1862 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1866 offset = sb->high_rxt - tc->snd_una;
1867 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1869 ASSERT (n_written <= snd_space);
1871 /* Nothing left to retransmit */
1875 bi = vlib_get_buffer_index (vm, b);
1876 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1878 sb->high_rxt += n_written;
1879 snd_space -= n_written;
1884 tcp_program_fastretransmit (wrk, tc);
1891 * Fast retransmit without SACK info
1894 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1897 u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
1898 vlib_main_t *vm = wrk->vm;
1899 int snd_space, n_segs = 0;
1902 ASSERT (tcp_in_fastrecovery (tc));
1903 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1905 if (!tcp_fastrecovery_first (tc))
1908 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1910 snd_space = tc->sack_sb.last_bytes_delivered;
1911 while (snd_space > 0 && n_segs < burst_size)
1913 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1916 /* Nothing left to retransmit */
1920 bi = vlib_get_buffer_index (vm, b);
1921 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1922 snd_space -= n_written;
1923 offset += n_written;
1927 if (n_segs == burst_size)
1932 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1933 snd_space = tcp_available_cc_snd_space (tc);
1934 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1937 max_deq = transport_max_tx_dequeue (&tc->connection);
1938 max_deq -= tc->snd_nxt - tc->snd_una;
1941 snd_space = clib_min (max_deq, snd_space);
1942 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1943 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1944 if (max_deq > n_segs_now * tc->snd_mss)
1945 tcp_program_fastretransmit (wrk, tc);
1946 n_segs += n_segs_now;
1950 tcp_fastrecovery_first_off (tc);
1955 * Do fast retransmit
1958 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1961 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1962 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1964 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1966 #endif /* CLIB_MARCH_VARIANT */
1969 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1970 u16 * next0, u32 * error0)
1972 ip_adjacency_t *adj;
1975 /* Not thread safe but as long as the connection exists the adj should
1977 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1979 if (ai == ADJ_INDEX_INVALID)
1981 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1982 *next0 = TCP_OUTPUT_NEXT_DROP;
1983 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1988 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1989 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1990 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
1991 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
1994 *next0 = TCP_OUTPUT_NEXT_DROP;
1995 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1997 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2001 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2002 u32 * to_next, u32 n_bufs)
2004 u32 n_trace = vlib_get_trace_count (vm, node);
2005 tcp_connection_t *tc;
2011 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2013 b = vlib_get_buffer (vm, to_next[i]);
2014 th = vlib_buffer_get_current (b);
2015 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2017 t = vlib_add_trace (vm, node, b, sizeof (*t));
2018 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2019 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2024 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2025 tcp_connection_t * tc0, u8 is_ip4)
2027 tcp_header_t *th0 = 0;
2029 th0 = vlib_buffer_get_current (b0);
2030 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2033 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2034 IP_PROTOCOL_TCP, 1);
2035 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2036 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2042 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2043 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2044 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2045 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2046 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2052 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2053 u32 * error0, u16 * next0, u8 is_ip4)
2056 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2058 *error0 = TCP_ERROR_INVALID_CONNECTION;
2059 *next0 = TCP_OUTPUT_NEXT_DROP;
2063 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2064 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2068 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2069 tcp_output_handle_link_local (tc0, b0, next0, error0);
2072 if (!TCP_ALWAYS_ACK)
2073 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2077 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2078 vlib_frame_t * frame, int is_ip4)
2080 u32 n_left_from, *from, thread_index = vm->thread_index;
2081 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2082 u16 nexts[VLIB_FRAME_SIZE], *next;
2084 from = vlib_frame_vector_args (frame);
2085 n_left_from = frame->n_vectors;
2086 tcp_set_time_now (tcp_get_worker (thread_index));
2088 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2089 tcp46_output_trace_frame (vm, node, from, n_left_from);
2091 vlib_get_buffers (vm, from, bufs, n_left_from);
2095 while (n_left_from >= 4)
2097 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2098 tcp_connection_t *tc0, *tc1;
2101 vlib_prefetch_buffer_header (b[2], STORE);
2102 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2104 vlib_prefetch_buffer_header (b[3], STORE);
2105 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2108 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2110 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2112 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2115 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2116 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2118 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2119 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2125 while (n_left_from > 0)
2127 u32 error0 = TCP_ERROR_PKTS_SENT;
2128 tcp_connection_t *tc0;
2130 if (n_left_from > 1)
2132 vlib_prefetch_buffer_header (b[1], STORE);
2133 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2136 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2137 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2140 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2141 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2148 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2149 return frame->n_vectors;
2152 VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2153 vlib_frame_t * from_frame)
2155 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2158 VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2159 vlib_frame_t * from_frame)
2161 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2165 VLIB_REGISTER_NODE (tcp4_output_node) =
2167 .name = "tcp4-output",
2168 /* Takes a vector of packets. */
2169 .vector_size = sizeof (u32),
2170 .n_errors = TCP_N_ERROR,
2171 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2172 .error_strings = tcp_error_strings,
2173 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2175 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2176 foreach_tcp4_output_next
2179 .format_buffer = format_tcp_header,
2180 .format_trace = format_tcp_tx_trace,
2185 VLIB_REGISTER_NODE (tcp6_output_node) =
2187 .name = "tcp6-output",
2188 /* Takes a vector of packets. */
2189 .vector_size = sizeof (u32),
2190 .n_errors = TCP_N_ERROR,
2191 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2192 .error_strings = tcp_error_strings,
2193 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2195 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2196 foreach_tcp6_output_next
2199 .format_buffer = format_tcp_header,
2200 .format_trace = format_tcp_tx_trace,
2204 typedef enum _tcp_reset_next
2206 TCP_RESET_NEXT_DROP,
2207 TCP_RESET_NEXT_IP_LOOKUP,
2211 #define foreach_tcp4_reset_next \
2212 _(DROP, "error-drop") \
2213 _(IP_LOOKUP, "ip4-lookup")
2215 #define foreach_tcp6_reset_next \
2216 _(DROP, "error-drop") \
2217 _(IP_LOOKUP, "ip6-lookup")
2220 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2221 vlib_frame_t * from_frame, u8 is_ip4)
2223 u32 n_left_from, next_index, *from, *to_next;
2224 u32 my_thread_index = vm->thread_index;
2226 from = vlib_frame_vector_args (from_frame);
2227 n_left_from = from_frame->n_vectors;
2229 next_index = node->cached_next_index;
2231 while (n_left_from > 0)
2235 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2237 while (n_left_from > 0 && n_left_to_next > 0)
2243 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2250 n_left_to_next -= 1;
2252 b0 = vlib_get_buffer (vm, bi0);
2254 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2255 my_thread_index, is_ip4))
2257 error0 = TCP_ERROR_LOOKUP_DROPS;
2258 next0 = TCP_RESET_NEXT_DROP;
2262 /* Prepare to send to IP lookup */
2263 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2264 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2267 b0->error = node->errors[error0];
2268 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2269 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2271 th0 = vlib_buffer_get_current (b0);
2273 th0 = ip4_next_header ((ip4_header_t *) th0);
2275 th0 = ip6_next_header ((ip6_header_t *) th0);
2276 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2277 clib_memcpy_fast (&t0->tcp_header, th0,
2278 sizeof (t0->tcp_header));
2281 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2282 n_left_to_next, bi0, next0);
2284 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2286 return from_frame->n_vectors;
2289 VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2290 vlib_frame_t * from_frame)
2292 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2295 VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2296 vlib_frame_t * from_frame)
2298 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2302 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2303 .name = "tcp4-reset",
2304 .vector_size = sizeof (u32),
2305 .n_errors = TCP_N_ERROR,
2306 .error_strings = tcp_error_strings,
2307 .n_next_nodes = TCP_RESET_N_NEXT,
2309 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2310 foreach_tcp4_reset_next
2313 .format_trace = format_tcp_tx_trace,
2318 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2319 .name = "tcp6-reset",
2320 .vector_size = sizeof (u32),
2321 .n_errors = TCP_N_ERROR,
2322 .error_strings = tcp_error_strings,
2323 .n_next_nodes = TCP_RESET_N_NEXT,
2325 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2326 foreach_tcp6_reset_next
2329 .format_trace = format_tcp_tx_trace,
2334 * fd.io coding-style-patch-verification: ON
2337 * eval: (c-set-style "gnu")