2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/tcp/tcp.h>
17 #include <vnet/lisp-cp/packets.h>
20 vlib_node_registration_t tcp4_output_node;
21 vlib_node_registration_t tcp6_output_node;
23 typedef enum _tcp_output_next
26 TCP_OUTPUT_NEXT_IP_LOOKUP,
27 TCP_OUTPUT_NEXT_IP_REWRITE,
28 TCP_OUTPUT_NEXT_IP_ARP,
32 #define foreach_tcp4_output_next \
33 _ (DROP, "error-drop") \
34 _ (IP_LOOKUP, "ip4-lookup") \
35 _ (IP_REWRITE, "ip4-rewrite") \
38 #define foreach_tcp6_output_next \
39 _ (DROP, "error-drop") \
40 _ (IP_LOOKUP, "ip6-lookup") \
41 _ (IP_REWRITE, "ip6-rewrite") \
42 _ (IP_ARP, "ip6-discover-neighbor")
44 static char *tcp_error_strings[] = {
45 #define tcp_error(n,s) s,
46 #include <vnet/tcp/tcp_error.def>
52 tcp_header_t tcp_header;
53 tcp_connection_t tcp_connection;
59 format_tcp_tx_trace (u8 * s, va_list * args)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
63 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
64 u32 indent = format_get_indent (s);
66 s = format (s, "%U\n%U%U",
67 format_tcp_header, &t->tcp_header, 128,
68 format_white_space, indent,
69 format_tcp_connection, &t->tcp_connection, 1);
75 tcp_window_compute_scale (u32 window)
78 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
84 * Update max segment size we're able to process.
86 * The value is constrained by our interface's MTU and IP options. It is
87 * also what we advertise to our peer.
90 tcp_update_rcv_mss (tcp_connection_t * tc)
92 /* TODO find our iface MTU */
93 tc->mss = dummy_mtu - sizeof (tcp_header_t);
97 * TCP's initial window
100 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
102 /* RFC 6928 recommends the value lower. However at the time our connections
103 * are initialized, fifos may not be allocated. Therefore, advertise the
104 * smallest possible unscaled window size and update once fifos are
105 * assigned to the session.
108 tcp_update_rcv_mss (tc);
109 TCP_IW_N_SEGMENTS * tc->mss;
111 return TCP_MIN_RX_FIFO_SIZE;
115 * Compute initial window and scale factor. As per RFC1323, window field in
116 * SYN and SYN-ACK segments is never scaled.
119 tcp_initial_window_to_advertise (tcp_connection_t * tc)
121 tcp_main_t *tm = &tcp_main;
124 /* Initial wnd for SYN. Fifos are not allocated yet.
125 * Use some predefined value. For SYN-ACK we still want the
126 * scale to be computed in the same way */
127 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
129 /* Compute rcv wscale only if peer advertised support for it */
130 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
131 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
133 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
135 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
139 tcp_update_rcv_wnd (tcp_connection_t * tc)
142 u32 available_space, max_fifo, wnd;
145 * Figure out how much space we have available
147 available_space = transport_max_rx_enqueue (&tc->connection);
148 max_fifo = transport_rx_fifo_size (&tc->connection);
150 ASSERT (tc->rcv_opts.mss < max_fifo);
151 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
155 * Use the above and what we know about what we've previously advertised
156 * to compute the new window
158 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
159 if (observed_wnd < 0)
162 /* Bad. Thou shalt not shrink */
163 if (available_space < observed_wnd)
166 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
170 wnd = available_space;
173 /* Make sure we have a multiple of rcv_wscale */
174 if (wnd && tc->rcv_wscale)
176 wnd &= ~(1 << tc->rcv_wscale);
178 wnd = 1 << tc->rcv_wscale;
181 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
185 * Compute and return window to advertise, scaled as per RFC1323
188 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
190 if (state < TCP_STATE_ESTABLISHED)
191 return tcp_initial_window_to_advertise (tc);
193 tcp_update_rcv_wnd (tc);
195 if (tc->rcv_wnd == 0)
197 tc->flags |= TCP_CONN_SENT_RCV_WND0;
201 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
204 return tc->rcv_wnd >> tc->rcv_wscale;
208 * Write TCP options to segment.
211 tcp_options_write (u8 * data, tcp_options_t * opts)
214 u32 buf, seq_len = 4;
216 if (tcp_opts_mss (opts))
218 *data++ = TCP_OPTION_MSS;
219 *data++ = TCP_OPTION_LEN_MSS;
220 buf = clib_host_to_net_u16 (opts->mss);
221 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
222 data += sizeof (opts->mss);
223 opts_len += TCP_OPTION_LEN_MSS;
226 if (tcp_opts_wscale (opts))
228 *data++ = TCP_OPTION_WINDOW_SCALE;
229 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
230 *data++ = opts->wscale;
231 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
234 if (tcp_opts_sack_permitted (opts))
236 *data++ = TCP_OPTION_SACK_PERMITTED;
237 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
238 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
241 if (tcp_opts_tstamp (opts))
243 *data++ = TCP_OPTION_TIMESTAMP;
244 *data++ = TCP_OPTION_LEN_TIMESTAMP;
245 buf = clib_host_to_net_u32 (opts->tsval);
246 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
247 data += sizeof (opts->tsval);
248 buf = clib_host_to_net_u32 (opts->tsecr);
249 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
250 data += sizeof (opts->tsecr);
251 opts_len += TCP_OPTION_LEN_TIMESTAMP;
254 if (tcp_opts_sack (opts))
257 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
258 TCP_OPTS_MAX_SACK_BLOCKS);
260 if (n_sack_blocks != 0)
262 *data++ = TCP_OPTION_SACK_BLOCK;
263 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
264 for (i = 0; i < n_sack_blocks; i++)
266 buf = clib_host_to_net_u32 (opts->sacks[i].start);
267 clib_memcpy_fast (data, &buf, seq_len);
269 buf = clib_host_to_net_u32 (opts->sacks[i].end);
270 clib_memcpy_fast (data, &buf, seq_len);
273 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
277 /* Terminate TCP options */
280 *data++ = TCP_OPTION_EOL;
281 opts_len += TCP_OPTION_LEN_EOL;
284 /* Pad with zeroes to a u32 boundary */
287 *data++ = TCP_OPTION_NOOP;
288 opts_len += TCP_OPTION_LEN_NOOP;
294 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
298 opts->flags |= TCP_OPTS_FLAG_MSS;
299 opts->mss = dummy_mtu; /*XXX discover that */
300 len += TCP_OPTION_LEN_MSS;
302 opts->flags |= TCP_OPTS_FLAG_WSCALE;
303 opts->wscale = wnd_scale;
304 len += TCP_OPTION_LEN_WINDOW_SCALE;
306 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
307 opts->tsval = tcp_time_now ();
309 len += TCP_OPTION_LEN_TIMESTAMP;
313 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
314 len += TCP_OPTION_LEN_SACK_PERMITTED;
317 /* Align to needed boundary */
318 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
323 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
327 opts->flags |= TCP_OPTS_FLAG_MSS;
329 len += TCP_OPTION_LEN_MSS;
331 if (tcp_opts_wscale (&tc->rcv_opts))
333 opts->flags |= TCP_OPTS_FLAG_WSCALE;
334 opts->wscale = tc->rcv_wscale;
335 len += TCP_OPTION_LEN_WINDOW_SCALE;
338 if (tcp_opts_tstamp (&tc->rcv_opts))
340 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
341 opts->tsval = tcp_time_now ();
342 opts->tsecr = tc->tsval_recent;
343 len += TCP_OPTION_LEN_TIMESTAMP;
346 if (tcp_opts_sack_permitted (&tc->rcv_opts))
348 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
349 len += TCP_OPTION_LEN_SACK_PERMITTED;
352 /* Align to needed boundary */
353 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
358 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
364 if (tcp_opts_tstamp (&tc->rcv_opts))
366 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
367 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
368 opts->tsecr = tc->tsval_recent;
369 len += TCP_OPTION_LEN_TIMESTAMP;
371 if (tcp_opts_sack_permitted (&tc->rcv_opts))
373 if (vec_len (tc->snd_sacks))
375 opts->flags |= TCP_OPTS_FLAG_SACK;
376 opts->sacks = tc->snd_sacks;
377 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
378 TCP_OPTS_MAX_SACK_BLOCKS);
379 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
383 /* Align to needed boundary */
384 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
389 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
394 case TCP_STATE_ESTABLISHED:
395 case TCP_STATE_CLOSE_WAIT:
396 case TCP_STATE_FIN_WAIT_1:
397 case TCP_STATE_LAST_ACK:
398 case TCP_STATE_CLOSING:
399 case TCP_STATE_FIN_WAIT_2:
400 case TCP_STATE_TIME_WAIT:
401 case TCP_STATE_CLOSED:
402 return tcp_make_established_options (tc, opts);
403 case TCP_STATE_SYN_RCVD:
404 return tcp_make_synack_options (tc, opts);
405 case TCP_STATE_SYN_SENT:
406 return tcp_make_syn_options (opts, tc->rcv_wscale);
408 clib_warning ("State not handled! %d", state);
414 * Update burst send vars
416 * - Updates snd_mss to reflect the effective segment size that we can send
417 * by taking into account all TCP options, including SACKs.
418 * - Cache 'on the wire' options for reuse
419 * - Updates receive window which can be reused for a burst.
421 * This should *only* be called when doing bursts
424 tcp_update_burst_snd_vars (tcp_connection_t * tc)
426 tcp_main_t *tm = &tcp_main;
428 /* Compute options to be used for connection. These may be reused when
429 * sending data or to compute the effective mss (snd_mss) */
430 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
431 TCP_STATE_ESTABLISHED);
433 /* XXX check if MTU has been updated */
434 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
435 ASSERT (tc->snd_mss > 0);
437 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
440 tcp_update_rcv_wnd (tc);
444 tcp_init_mss (tcp_connection_t * tc)
446 u16 default_min_mss = 536;
447 tcp_update_rcv_mss (tc);
449 /* TODO cache mss and consider PMTU discovery */
450 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
452 if (tc->snd_mss < 45)
454 /* Assume that at least the min default mss works */
455 tc->snd_mss = default_min_mss;
456 tc->rcv_opts.mss = default_min_mss;
459 /* We should have enough space for 40 bytes of options */
460 ASSERT (tc->snd_mss > 45);
462 /* If we use timestamp option, account for it */
463 if (tcp_opts_tstamp (&tc->rcv_opts))
464 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
468 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
470 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
471 vlib_buffer_free_one (vm, b->next_buffer);
472 /* Zero all flags but free list index and trace flag */
473 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
475 b->current_length = 0;
476 b->total_length_not_including_first_buffer = 0;
477 vnet_buffer (b)->tcp.flags = 0;
479 /* Leave enough space for headers */
480 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
484 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
486 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
487 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
488 b->total_length_not_including_first_buffer = 0;
490 vnet_buffer (b)->tcp.flags = 0;
491 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
492 /* Leave enough space for headers */
493 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
500 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
503 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
504 u8 tcp_opts_len, tcp_hdr_opts_len;
508 wnd = tcp_window_to_advertise (tc, state);
510 /* Make and write options */
511 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
512 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
514 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
515 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
517 tcp_options_write ((u8 *) (th + 1), snd_opts);
518 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
522 * Convert buffer to ACK
525 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
527 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
528 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
529 tc->rcv_las = tc->rcv_nxt;
533 * Convert buffer to FIN-ACK
536 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
538 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK);
540 /* Reset flags, make sure ack is sent */
541 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
545 * Convert buffer to SYN
548 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
550 u8 tcp_hdr_opts_len, tcp_opts_len;
553 tcp_options_t snd_opts;
555 initial_wnd = tcp_initial_window_to_advertise (tc);
557 /* Make and write options */
558 clib_memset (&snd_opts, 0, sizeof (snd_opts));
559 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
560 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
562 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
563 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
565 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
566 tcp_options_write ((u8 *) (th + 1), &snd_opts);
570 * Convert buffer to SYN-ACK
573 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
575 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
576 u8 tcp_opts_len, tcp_hdr_opts_len;
580 clib_memset (snd_opts, 0, sizeof (*snd_opts));
581 initial_wnd = tcp_initial_window_to_advertise (tc);
582 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
583 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
585 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
586 tc->rcv_nxt, tcp_hdr_opts_len,
587 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
588 tcp_options_write ((u8 *) (th + 1), snd_opts);
590 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
592 /* Init retransmit timer. Use update instead of set because of
594 tcp_retransmit_timer_force_update (tc);
595 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
599 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
600 u8 is_ip4, u32 fib_index, u8 flush)
602 vlib_main_t *vm = wrk->vm;
603 u32 *to_next, next_index;
606 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
609 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
610 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
612 /* Send to IP lookup */
613 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
614 tcp_trajectory_add_start (b, 1);
616 f = wrk->ip_lookup_tx_frames[!is_ip4];
619 f = vlib_get_frame_to_node (vm, next_index);
621 wrk->ip_lookup_tx_frames[!is_ip4] = f;
624 to_next = vlib_frame_vector_args (f);
625 to_next[f->n_vectors] = bi;
627 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
629 vlib_put_frame_to_node (vm, next_index, f);
630 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
635 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
636 u32 bi, u8 is_ip4, u32 fib_index)
638 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
642 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
643 u8 is_ip4, u32 fib_index)
645 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
646 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
647 session_flush_frames_main_thread (wrk->vm);
651 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
654 u32 *to_next, next_index;
657 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
660 /* Decide where to send the packet */
661 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
662 tcp_trajectory_add_start (b, 2);
664 /* Get frame to v4/6 output node */
665 f = wrk->tx_frames[!is_ip4];
668 f = vlib_get_frame_to_node (wrk->vm, next_index);
670 wrk->tx_frames[!is_ip4] = f;
672 to_next = vlib_frame_vector_args (f);
673 to_next[f->n_vectors] = bi;
675 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
677 vlib_put_frame_to_node (wrk->vm, next_index, f);
678 wrk->tx_frames[!is_ip4] = 0;
683 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
686 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
690 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
693 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
697 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
698 tcp_state_t state, u8 thread_index, u8 is_ip4)
703 ip4_address_t src_ip40, dst_ip40;
704 ip6_address_t src_ip60, dst_ip60;
705 u16 src_port, dst_port;
710 /* Find IP and TCP headers */
711 th0 = tcp_buffer_hdr (b0);
713 /* Save src and dst ip */
716 ih4 = vlib_buffer_get_current (b0);
717 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
718 src_ip40.as_u32 = ih4->src_address.as_u32;
719 dst_ip40.as_u32 = ih4->dst_address.as_u32;
723 ih6 = vlib_buffer_get_current (b0);
724 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
725 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
726 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
729 src_port = th0->src_port;
730 dst_port = th0->dst_port;
732 /* Try to determine what/why we're actually resetting */
733 if (state == TCP_STATE_CLOSED)
738 tmp = clib_net_to_host_u32 (th0->seq_number);
740 /* Got a SYN for no listener. */
741 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
742 ack = clib_host_to_net_u32 (tmp + 1);
747 flags = TCP_FLAG_RST;
748 seq = th0->ack_number;
752 tcp_reuse_buffer (vm, b0);
753 tcp_trajectory_add_start (b0, 4);
754 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
755 sizeof (tcp_header_t), flags, 0);
759 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
761 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
766 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
768 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
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, u8 is_ip4)
783 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
784 vlib_main_t *vm = wrk->vm;
786 u32 bi, sw_if_index, fib_index;
787 u8 tcp_hdr_len, flags = 0;
788 tcp_header_t *th, *pkt_th;
790 ip4_header_t *ih4, *pkt_ih4;
791 ip6_header_t *ih6, *pkt_ih6;
792 fib_protocol_t fib_proto;
794 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
797 b = vlib_get_buffer (vm, bi);
798 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
799 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
800 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
801 tcp_init_buffer (vm, b);
803 /* Make and write options */
804 tcp_hdr_len = sizeof (tcp_header_t);
808 pkt_ih4 = vlib_buffer_get_current (pkt);
809 pkt_th = ip4_next_header (pkt_ih4);
813 pkt_ih6 = vlib_buffer_get_current (pkt);
814 pkt_th = ip6_next_header (pkt_ih6);
817 if (tcp_ack (pkt_th))
819 flags = TCP_FLAG_RST;
820 seq = pkt_th->ack_number;
821 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
825 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
827 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
830 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
831 seq, ack, tcp_hdr_len, flags, 0);
833 /* Swap src and dst ip */
836 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
837 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
838 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
839 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
844 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
846 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
847 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
848 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
852 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
853 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
857 * Build and set reset packet for connection
860 tcp_send_reset (tcp_connection_t * tc)
862 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
863 vlib_main_t *vm = wrk->vm;
867 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
870 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
872 b = vlib_get_buffer (vm, bi);
873 tcp_init_buffer (vm, b);
875 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
876 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
877 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
878 flags = TCP_FLAG_RST;
879 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
880 tc->rcv_nxt, tcp_hdr_opts_len, flags,
882 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
883 ASSERT (opts_write_len == tc->snd_opts_len);
884 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
888 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
889 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
890 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
896 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
897 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
898 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
901 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
902 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
906 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
909 tcp_header_t *th = vlib_buffer_get_current (b);
910 vlib_main_t *vm = wrk->vm;
914 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
915 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
916 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
923 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
924 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
925 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
933 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
934 * The packet is not forwarded through tcpx_output to avoid doing lookups
935 * in the half_open pool.
938 tcp_send_syn (tcp_connection_t * tc)
940 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
941 vlib_main_t *vm = wrk->vm;
946 * Setup retransmit and establish timers before requesting buffer
947 * such that we can return if we've ran out.
949 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
950 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
951 tc->rto * TCP_TO_TIMER_TICK);
953 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
956 b = vlib_get_buffer (vm, bi);
957 tcp_init_buffer (vm, b);
958 tcp_make_syn (tc, b);
960 /* Measure RTT with this */
961 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
962 tc->rtt_seq = tc->snd_nxt;
965 tcp_push_ip_hdr (wrk, tc, b);
966 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
967 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
971 tcp_send_synack (tcp_connection_t * tc)
973 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
974 vlib_main_t *vm = wrk->vm;
978 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
981 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
982 b = vlib_get_buffer (vm, bi);
983 tcp_init_buffer (vm, b);
984 tcp_make_synack (tc, b);
985 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
989 * Flush tx frame populated by retransmits and timer pops
992 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
994 if (wrk->tx_frames[!is_ip4])
997 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
998 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
999 wrk->tx_frames[!is_ip4] = 0;
1004 * Flush ip lookup tx frames populated by timer pops
1007 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1009 if (wrk->ip_lookup_tx_frames[!is_ip4])
1012 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1013 vlib_put_frame_to_node (wrk->vm, next_index,
1014 wrk->ip_lookup_tx_frames[!is_ip4]);
1015 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1020 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1023 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1025 tcp_flush_frame_to_output (wrk, 1);
1026 tcp_flush_frame_to_output (wrk, 0);
1027 tcp_flush_frame_to_ip_lookup (wrk, 1);
1028 tcp_flush_frame_to_ip_lookup (wrk, 0);
1035 tcp_send_fin (tcp_connection_t * tc)
1037 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1038 vlib_main_t *vm = wrk->vm;
1043 fin_snt = tc->flags & TCP_CONN_FINSNT;
1045 tc->snd_nxt = tc->snd_una;
1047 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1049 /* Out of buffers so program fin retransmit ASAP */
1050 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1052 tc->snd_nxt = tc->snd_una_max;
1056 tcp_retransmit_timer_force_update (tc);
1057 b = vlib_get_buffer (vm, bi);
1058 tcp_init_buffer (vm, b);
1059 tcp_make_fin (tc, b);
1060 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1061 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1065 tc->flags |= TCP_CONN_FINSNT;
1066 tc->flags &= ~TCP_CONN_FINPNDG;
1067 /* Account for the FIN */
1068 tc->snd_una_max += 1;
1069 tc->snd_nxt = tc->snd_una_max;
1073 tc->snd_nxt = tc->snd_una_max;
1078 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1082 case TCP_STATE_ESTABLISHED:
1083 case TCP_STATE_CLOSE_WAIT:
1084 case TCP_STATE_TIME_WAIT:
1085 case TCP_STATE_FIN_WAIT_2:
1086 return TCP_FLAG_ACK;
1087 case TCP_STATE_SYN_RCVD:
1088 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1089 case TCP_STATE_SYN_SENT:
1090 return TCP_FLAG_SYN;
1091 case TCP_STATE_LAST_ACK:
1092 case TCP_STATE_FIN_WAIT_1:
1093 case TCP_STATE_CLOSING:
1094 if (tc->snd_nxt + 1 < tc->snd_una_max)
1095 return TCP_FLAG_ACK;
1097 return TCP_FLAG_FIN;
1099 clib_warning ("Shouldn't be here!");
1105 * Push TCP header and update connection variables
1108 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1109 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1111 u32 advertise_wnd, data_len;
1112 u8 tcp_hdr_opts_len, flags;
1113 tcp_main_t *tm = &tcp_main;
1116 data_len = b->current_length;
1117 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1118 data_len += b->total_length_not_including_first_buffer;
1120 vnet_buffer (b)->tcp.flags = 0;
1121 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1124 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1126 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1129 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1131 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1133 flags = tcp_make_state_flags (tc, next_state);
1134 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1136 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1137 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1138 flags |= TCP_FLAG_PSH;
1140 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1141 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1146 clib_memcpy_fast ((u8 *) (th + 1),
1147 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1152 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1153 ASSERT (len == tc->snd_opts_len);
1157 * Update connection variables
1160 tc->snd_nxt += data_len;
1161 tc->rcv_las = tc->rcv_nxt;
1163 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1167 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1169 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1171 tc->snd_una_max = tc->snd_nxt;
1172 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1173 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1174 /* If not tracking an ACK, start tracking */
1175 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1177 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1178 tc->rtt_seq = tc->snd_nxt;
1180 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1182 tcp_retransmit_timer_set (tc);
1185 tcp_trajectory_add_start (b, 3);
1190 tcp_send_ack (tcp_connection_t * tc)
1192 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1193 vlib_main_t *vm = wrk->vm;
1197 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1199 b = vlib_get_buffer (vm, bi);
1200 tcp_init_buffer (vm, b);
1201 tcp_make_ack (tc, b);
1202 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1206 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1208 if (!(tc->flags & TCP_CONN_SNDACK))
1210 vec_add1 (wrk->pending_acks, tc->c_c_index);
1211 tc->flags |= TCP_CONN_SNDACK;
1216 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1218 if (!(tc->flags & TCP_CONN_SNDACK))
1220 vec_add1 (wrk->pending_acks, tc->c_c_index);
1221 tc->flags |= TCP_CONN_SNDACK;
1223 if (tc->pending_dupacks < 255)
1224 tc->pending_dupacks += 1;
1228 tcp_send_acks (tcp_worker_ctx_t * wrk)
1230 u32 thread_index, *pending_acks;
1231 tcp_connection_t *tc;
1234 if (!vec_len (wrk->pending_acks))
1237 thread_index = wrk->vm->thread_index;
1238 pending_acks = wrk->pending_acks;
1239 for (i = 0; i < vec_len (pending_acks); i++)
1241 tc = tcp_connection_get (pending_acks[i], thread_index);
1242 tc->flags &= ~TCP_CONN_SNDACK;
1243 n_acks = clib_max (1, tc->pending_dupacks);
1244 /* If we're supposed to send dupacks but have no ooo data
1245 * send only one ack */
1246 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1248 for (j = 0; j < n_acks; j++)
1250 tc->pending_dupacks = 0;
1252 _vec_len (wrk->pending_acks) = 0;
1256 * Delayed ack timer handler
1258 * Sends delayed ACK when timer expires
1261 tcp_timer_delack_handler (u32 index)
1263 u32 thread_index = vlib_get_thread_index ();
1264 tcp_connection_t *tc;
1266 tc = tcp_connection_get (index, thread_index);
1267 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1272 * Allocate a new buffer and build a new tcp segment
1274 * @param wrk tcp worker
1275 * @param tc connection for which the segment will be allocated
1276 * @param offset offset of the first byte in the tx fifo
1277 * @param max_deq_byte segment size
1278 * @param[out] b pointer to buffer allocated
1280 * @return the number of bytes in the segment or 0 if buffer cannot be
1281 * allocated or no data available
1284 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1285 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1287 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1288 vlib_main_t *vm = wrk->vm;
1293 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1298 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1301 * Allocate and fill in buffer(s)
1304 /* Easy case, buffer size greater than mss */
1305 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1307 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1309 *b = vlib_get_buffer (vm, bi);
1310 data = tcp_init_buffer (vm, *b);
1311 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1313 ASSERT (n_bytes == max_deq_bytes);
1314 b[0]->current_length = n_bytes;
1315 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1316 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1317 tc->snd_una_max = tc->snd_nxt;
1319 /* Split mss into multiple buffers */
1322 u32 chain_bi = ~0, n_bufs_per_seg, n_bufs;
1323 u16 n_peeked, len_to_deq;
1324 vlib_buffer_t *chain_b, *prev_b;
1327 /* Make sure we have enough buffers */
1328 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1329 vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1,
1330 CLIB_CACHE_LINE_BYTES);
1331 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg);
1332 if (PREDICT_FALSE (n_bufs != n_bufs_per_seg))
1335 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1339 *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]);
1340 data = tcp_init_buffer (vm, *b);
1341 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1342 bytes_per_buffer - MAX_HDRS_LEN);
1343 b[0]->current_length = n_bytes;
1344 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1345 b[0]->total_length_not_including_first_buffer = 0;
1346 max_deq_bytes -= n_bytes;
1349 for (i = 1; i < n_bufs_per_seg; i++)
1352 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1353 chain_bi = wrk->tx_buffers[--n_bufs];
1354 chain_b = vlib_get_buffer (vm, chain_bi);
1355 chain_b->current_data = 0;
1356 data = vlib_buffer_get_current (chain_b);
1357 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1358 offset + n_bytes, len_to_deq);
1359 ASSERT (n_peeked == len_to_deq);
1360 n_bytes += n_peeked;
1361 chain_b->current_length = n_peeked;
1362 chain_b->next_buffer = 0;
1364 /* update previous buffer */
1365 prev_b->next_buffer = chain_bi;
1366 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1368 max_deq_bytes -= n_peeked;
1369 b[0]->total_length_not_including_first_buffer += n_peeked;
1372 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1373 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1374 tc->snd_una_max = tc->snd_nxt;
1376 if (PREDICT_FALSE (n_bufs))
1378 clib_warning ("not all buffers consumed");
1379 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1383 ASSERT (n_bytes > 0);
1384 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1390 * Build a retransmit segment
1392 * @return the number of bytes in the segment or 0 if there's nothing to
1396 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1397 tcp_connection_t * tc, u32 offset,
1398 u32 max_deq_bytes, vlib_buffer_t ** b)
1400 u32 start, available_bytes;
1403 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1404 ASSERT (max_deq_bytes != 0);
1407 * Make sure we can retransmit something
1409 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1410 ASSERT (available_bytes >= offset);
1411 available_bytes -= offset;
1412 if (!available_bytes)
1415 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1416 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1418 /* Start is beyond snd_congestion */
1419 start = tc->snd_una + offset;
1420 if (seq_geq (start, tc->snd_congestion))
1423 /* Don't overshoot snd_congestion */
1424 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1426 max_deq_bytes = tc->snd_congestion - start;
1427 if (max_deq_bytes == 0)
1431 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1435 if (tcp_in_fastrecovery (tc))
1436 tc->snd_rxt_bytes += n_bytes;
1439 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1444 * Reset congestion control, switch cwnd to loss window and try again.
1447 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1449 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1450 tc->prev_ssthresh = tc->ssthresh;
1451 tc->prev_cwnd = tc->cwnd;
1453 /* Cleanly recover cc (also clears up fast retransmit) */
1454 if (tcp_in_fastrecovery (tc))
1456 /* TODO be less aggressive about this */
1457 scoreboard_clear (&tc->sack_sb);
1458 tcp_cc_fastrecovery_exit (tc);
1461 /* Start again from the beginning */
1462 tc->cc_algo->congestion (tc);
1463 tc->cwnd = tcp_loss_wnd (tc);
1464 tc->snd_congestion = tc->snd_una_max;
1466 tc->cwnd_acc_bytes = 0;
1467 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1468 tcp_recovery_on (tc);
1472 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1474 u32 thread_index = vlib_get_thread_index ();
1475 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1476 vlib_main_t *vm = wrk->vm;
1477 tcp_connection_t *tc;
1478 vlib_buffer_t *b = 0;
1483 tc = tcp_half_open_connection_get (index);
1484 /* Note: the connection may have transitioned to ESTABLISHED... */
1485 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1487 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1491 tc = tcp_connection_get (index, thread_index);
1492 /* Note: the connection may have been closed and pool_put */
1493 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1495 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1496 /* Wait-close and retransmit could pop at the same time */
1497 if (tc->state == TCP_STATE_CLOSED)
1501 if (tc->state >= TCP_STATE_ESTABLISHED)
1503 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1505 /* Lost FIN, retransmit and return */
1506 if (tcp_is_lost_fin (tc))
1510 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1514 /* Shouldn't be here. This condition is tricky because it has to take
1515 * into account boff > 0 due to persist timeout. */
1516 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1517 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1518 && !tcp_flight_size (tc)))
1520 ASSERT (!tcp_in_recovery (tc));
1525 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1526 * to persist timer timeout */
1527 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1530 tcp_update_rto (tc);
1533 /* Increment RTO backoff (also equal to number of retries) and go back
1534 * to first un-acked byte */
1537 /* First retransmit timeout */
1538 if (tc->rto_boff == 1)
1539 tcp_rxt_timeout_cc (tc);
1541 scoreboard_clear (&tc->sack_sb);
1543 /* If we've sent beyond snd_congestion, update it */
1544 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1545 tc->snd_congestion = tc->snd_una_max;
1547 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1548 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1550 /* Send one segment. Note that n_bytes may be zero due to buffer
1552 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1555 tcp_retransmit_timer_force_update (tc);
1559 bi = vlib_get_buffer_index (vm, b);
1561 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1562 if (tc->rto_boff == 1)
1563 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1565 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1566 tcp_retransmit_timer_force_update (tc);
1568 /* Retransmit for SYN */
1569 else if (tc->state == TCP_STATE_SYN_SENT)
1571 /* Half-open connection actually moved to established but we were
1572 * waiting for syn retransmit to pop to call cleanup from the right
1574 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1576 if (tcp_half_open_connection_cleanup (tc))
1577 TCP_DBG ("could not remove half-open connection");
1581 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1583 /* Try without increasing RTO a number of times. If this fails,
1584 * start growing RTO exponentially */
1586 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1587 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1589 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1590 tc->rto * TCP_TO_TIMER_TICK);
1592 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 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 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1618 tcp_retransmit_timer_force_update (tc);
1622 b = vlib_get_buffer (vm, bi);
1623 tcp_init_buffer (vm, b);
1624 tcp_make_synack (tc, b);
1625 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1627 /* Retransmit timer already updated, just enqueue to output */
1628 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1632 ASSERT (tc->state == TCP_STATE_CLOSED);
1638 tcp_timer_retransmit_handler (u32 index)
1640 tcp_timer_retransmit_handler_i (index, 0);
1644 tcp_timer_retransmit_syn_handler (u32 index)
1646 tcp_timer_retransmit_handler_i (index, 1);
1650 * Got 0 snd_wnd from peer, try to do something about it.
1654 tcp_timer_persist_handler (u32 index)
1656 u32 thread_index = vlib_get_thread_index ();
1657 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1658 u32 bi, max_snd_bytes, available_bytes, offset;
1659 tcp_main_t *tm = vnet_get_tcp_main ();
1660 vlib_main_t *vm = wrk->vm;
1661 tcp_connection_t *tc;
1666 tc = tcp_connection_get_if_valid (index, thread_index);
1671 /* Make sure timer handle is set to invalid */
1672 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1674 /* Problem already solved or worse */
1675 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1676 || tc->snd_wnd > tc->snd_mss)
1679 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1680 offset = tc->snd_una_max - tc->snd_una;
1682 /* Reprogram persist if no new bytes available to send. We may have data
1684 if (!available_bytes)
1686 tcp_persist_timer_set (tc);
1690 if (available_bytes <= offset)
1692 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1696 /* Increment RTO backoff */
1698 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1701 * Try to force the first unsent segment (or buffer)
1703 if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
1705 tcp_persist_timer_set (tc);
1708 b = vlib_get_buffer (vm, bi);
1709 data = tcp_init_buffer (vm, b);
1711 tcp_validate_txf_size (tc, offset);
1712 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1713 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1714 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1716 b->current_length = n_bytes;
1717 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1718 || tc->snd_nxt == tc->snd_una_max
1719 || tc->rto_boff > 1));
1721 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1722 tc->snd_una_max = tc->snd_nxt;
1723 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1724 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1726 /* Just sent new data, enable retransmit */
1727 tcp_retransmit_timer_update (tc);
1731 * Retransmit first unacked segment
1734 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1736 u32 bi, old_snd_nxt, n_bytes;
1737 vlib_main_t *vm = wrk->vm;
1740 old_snd_nxt = tc->snd_nxt;
1741 tc->snd_nxt = tc->snd_una;
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);
1751 tc->snd_nxt = old_snd_nxt;
1757 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1760 u32 offset, n_segs = 0, n_written, bi;
1761 vlib_main_t *vm = wrk->vm;
1762 vlib_buffer_t *b = 0;
1764 tc->snd_nxt = tc->snd_una_max;
1765 offset = tc->snd_una_max - tc->snd_una;
1766 while (n_segs < burst_size)
1768 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1772 bi = vlib_get_buffer_index (vm, b);
1773 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1774 offset += n_written;
1782 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1783 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1784 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1787 * Do fast retransmit with SACKs
1790 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1793 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1794 sack_scoreboard_hole_t *hole;
1795 vlib_main_t *vm = wrk->vm;
1796 vlib_buffer_t *b = 0;
1797 sack_scoreboard_t *sb;
1798 u32 bi, old_snd_nxt;
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);
1813 old_snd_nxt = tc->snd_nxt;
1815 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1817 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1818 max_deq -= tc->snd_una_max - tc->snd_una;
1820 while (snd_space > 0 && n_segs < burst_size)
1822 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1828 snd_space = clib_min (max_deq, snd_space);
1829 burst_size = clib_min (burst_size - n_segs,
1830 snd_space / tc->snd_mss);
1831 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1832 if (max_deq > n_segs_now * tc->snd_mss)
1833 tcp_program_fastretransmit (wrk, tc);
1834 n_segs += n_segs_now;
1838 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1841 /* If rescue rxt undefined or less than snd_una then one segment of
1842 * up to SMSS octets that MUST include the highest outstanding
1843 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1844 * RecoveryPoint. HighRxt MUST NOT be updated.
1846 max_bytes = clib_min (tc->snd_mss,
1847 tc->snd_congestion - tc->snd_una);
1848 max_bytes = clib_min (max_bytes, snd_space);
1849 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1850 sb->rescue_rxt = tc->snd_congestion;
1851 tc->snd_nxt = tc->snd_una + offset;
1852 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1857 bi = vlib_get_buffer_index (vm, b);
1858 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1863 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1864 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1868 offset = sb->high_rxt - tc->snd_una;
1869 tc->snd_nxt = sb->high_rxt;
1870 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1872 ASSERT (n_written <= snd_space);
1874 /* Nothing left to retransmit */
1878 bi = vlib_get_buffer_index (vm, b);
1879 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1881 sb->high_rxt += n_written;
1882 snd_space -= n_written;
1887 tcp_program_fastretransmit (wrk, tc);
1890 /* If window allows, send 1 SMSS of new data */
1891 tc->snd_nxt = old_snd_nxt;
1896 * Fast retransmit without SACK info
1899 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1902 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1903 vlib_main_t *vm = wrk->vm;
1904 int snd_space, n_segs = 0;
1907 ASSERT (tcp_in_fastrecovery (tc));
1908 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1909 old_snd_nxt = tc->snd_nxt;
1911 if (!tcp_fastrecovery_first (tc))
1914 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1916 snd_space = tc->sack_sb.last_bytes_delivered;
1917 tc->snd_nxt = tc->snd_una;
1918 while (snd_space > 0 && n_segs < burst_size)
1920 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1923 /* Nothing left to retransmit */
1927 bi = vlib_get_buffer_index (vm, b);
1928 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1929 snd_space -= n_written;
1930 offset += n_written;
1934 if (n_segs == burst_size)
1939 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1940 snd_space = tcp_available_cc_snd_space (tc);
1941 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1944 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1945 max_deq -= tc->snd_una_max - tc->snd_una;
1948 snd_space = clib_min (max_deq, snd_space);
1949 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1950 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1951 if (max_deq > n_segs_now * tc->snd_mss)
1952 tcp_program_fastretransmit (wrk, tc);
1953 n_segs += n_segs_now;
1956 /* Restore snd_nxt */
1957 tc->snd_nxt = old_snd_nxt;
1960 tcp_fastrecovery_first_off (tc);
1965 * Do fast retransmit
1968 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1971 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1972 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
1974 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
1978 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
1979 u16 * next0, u32 * error0)
1981 ip_adjacency_t *adj;
1984 /* Not thread safe but as long as the connection exists the adj should
1986 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
1988 if (ai == ADJ_INDEX_INVALID)
1990 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
1991 *next0 = TCP_OUTPUT_NEXT_DROP;
1992 *error0 = TCP_ERROR_LINK_LOCAL_RW;
1997 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
1998 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
1999 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2000 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2003 *next0 = TCP_OUTPUT_NEXT_DROP;
2004 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2006 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2010 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2011 u32 * to_next, u32 n_bufs)
2013 u32 n_trace = vlib_get_trace_count (vm, node);
2014 tcp_connection_t *tc;
2020 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2022 b = vlib_get_buffer (vm, to_next[i]);
2023 th = vlib_buffer_get_current (b);
2024 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2026 t = vlib_add_trace (vm, node, b, sizeof (*t));
2027 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2028 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2033 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2034 tcp_connection_t * tc0, u8 is_ip4)
2036 tcp_header_t *th0 = 0;
2038 th0 = vlib_buffer_get_current (b0);
2039 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2042 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2043 IP_PROTOCOL_TCP, 1);
2044 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2045 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2051 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2052 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2053 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2054 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2055 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2061 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2062 u32 * error0, u16 * next0, u8 is_ip4)
2065 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2067 *error0 = TCP_ERROR_INVALID_CONNECTION;
2068 *next0 = TCP_OUTPUT_NEXT_DROP;
2072 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2073 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2077 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2078 tcp_output_handle_link_local (tc0, b0, next0, error0);
2081 if (!TCP_ALWAYS_ACK)
2082 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2086 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2087 vlib_frame_t * frame, int is_ip4)
2089 u32 n_left_from, *from, thread_index = vm->thread_index;
2090 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2091 u16 nexts[VLIB_FRAME_SIZE], *next;
2093 from = vlib_frame_vector_args (frame);
2094 n_left_from = frame->n_vectors;
2095 tcp_set_time_now (tcp_get_worker (thread_index));
2097 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2098 tcp46_output_trace_frame (vm, node, from, n_left_from);
2100 vlib_get_buffers (vm, from, bufs, n_left_from);
2104 while (n_left_from >= 4)
2106 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2107 tcp_connection_t *tc0, *tc1;
2110 vlib_prefetch_buffer_header (b[2], STORE);
2111 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2113 vlib_prefetch_buffer_header (b[3], STORE);
2114 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2117 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2119 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2121 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2124 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2125 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2127 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2128 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2134 while (n_left_from > 0)
2136 u32 error0 = TCP_ERROR_PKTS_SENT;
2137 tcp_connection_t *tc0;
2139 if (n_left_from > 1)
2141 vlib_prefetch_buffer_header (b[1], STORE);
2142 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2145 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2146 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2149 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2150 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2157 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2158 return frame->n_vectors;
2162 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2163 vlib_frame_t * from_frame)
2165 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2169 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2170 vlib_frame_t * from_frame)
2172 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2176 VLIB_REGISTER_NODE (tcp4_output_node) =
2178 .function = tcp4_output,
2179 .name = "tcp4-output",
2180 /* Takes a vector of packets. */
2181 .vector_size = sizeof (u32),
2182 .n_errors = TCP_N_ERROR,
2183 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2184 .error_strings = tcp_error_strings,
2185 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2187 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2188 foreach_tcp4_output_next
2191 .format_buffer = format_tcp_header,
2192 .format_trace = format_tcp_tx_trace,
2196 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2199 VLIB_REGISTER_NODE (tcp6_output_node) =
2201 .function = tcp6_output,
2202 .name = "tcp6-output",
2203 /* Takes a vector of packets. */
2204 .vector_size = sizeof (u32),
2205 .n_errors = TCP_N_ERROR,
2206 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2207 .error_strings = tcp_error_strings,
2208 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2210 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2211 foreach_tcp6_output_next
2214 .format_buffer = format_tcp_header,
2215 .format_trace = format_tcp_tx_trace,
2219 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2221 typedef enum _tcp_reset_next
2223 TCP_RESET_NEXT_DROP,
2224 TCP_RESET_NEXT_IP_LOOKUP,
2228 #define foreach_tcp4_reset_next \
2229 _(DROP, "error-drop") \
2230 _(IP_LOOKUP, "ip4-lookup")
2232 #define foreach_tcp6_reset_next \
2233 _(DROP, "error-drop") \
2234 _(IP_LOOKUP, "ip6-lookup")
2237 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2238 vlib_frame_t * from_frame, u8 is_ip4)
2240 u32 n_left_from, next_index, *from, *to_next;
2241 u32 my_thread_index = vm->thread_index;
2243 from = vlib_frame_vector_args (from_frame);
2244 n_left_from = from_frame->n_vectors;
2246 next_index = node->cached_next_index;
2248 while (n_left_from > 0)
2252 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2254 while (n_left_from > 0 && n_left_to_next > 0)
2260 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2267 n_left_to_next -= 1;
2269 b0 = vlib_get_buffer (vm, bi0);
2271 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2272 my_thread_index, is_ip4))
2274 error0 = TCP_ERROR_LOOKUP_DROPS;
2275 next0 = TCP_RESET_NEXT_DROP;
2279 /* Prepare to send to IP lookup */
2280 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2281 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2284 b0->error = node->errors[error0];
2285 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2286 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2288 th0 = vlib_buffer_get_current (b0);
2290 th0 = ip4_next_header ((ip4_header_t *) th0);
2292 th0 = ip6_next_header ((ip6_header_t *) th0);
2293 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2294 clib_memcpy_fast (&t0->tcp_header, th0,
2295 sizeof (t0->tcp_header));
2298 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2299 n_left_to_next, bi0, next0);
2301 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2303 return from_frame->n_vectors;
2307 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2308 vlib_frame_t * from_frame)
2310 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2314 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2315 vlib_frame_t * from_frame)
2317 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2321 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2322 .function = tcp4_send_reset,
2323 .name = "tcp4-reset",
2324 .vector_size = sizeof (u32),
2325 .n_errors = TCP_N_ERROR,
2326 .error_strings = tcp_error_strings,
2327 .n_next_nodes = TCP_RESET_N_NEXT,
2329 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2330 foreach_tcp4_reset_next
2333 .format_trace = format_tcp_tx_trace,
2337 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2340 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2341 .function = tcp6_send_reset,
2342 .name = "tcp6-reset",
2343 .vector_size = sizeof (u32),
2344 .n_errors = TCP_N_ERROR,
2345 .error_strings = tcp_error_strings,
2346 .n_next_nodes = TCP_RESET_N_NEXT,
2348 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2349 foreach_tcp6_reset_next
2352 .format_trace = format_tcp_tx_trace,
2356 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2359 * fd.io coding-style-patch-verification: ON
2362 * eval: (c-set-style "gnu")