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_FIN_WAIT_1:
396 case TCP_STATE_CLOSED:
397 case TCP_STATE_CLOSE_WAIT:
398 return tcp_make_established_options (tc, opts);
399 case TCP_STATE_SYN_RCVD:
400 return tcp_make_synack_options (tc, opts);
401 case TCP_STATE_SYN_SENT:
402 return tcp_make_syn_options (opts, tc->rcv_wscale);
404 clib_warning ("State not handled! %d", state);
410 * Update burst send vars
412 * - Updates snd_mss to reflect the effective segment size that we can send
413 * by taking into account all TCP options, including SACKs.
414 * - Cache 'on the wire' options for reuse
415 * - Updates receive window which can be reused for a burst.
417 * This should *only* be called when doing bursts
420 tcp_update_burst_snd_vars (tcp_connection_t * tc)
422 tcp_main_t *tm = &tcp_main;
424 /* Compute options to be used for connection. These may be reused when
425 * sending data or to compute the effective mss (snd_mss) */
426 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
427 TCP_STATE_ESTABLISHED);
429 /* XXX check if MTU has been updated */
430 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
431 ASSERT (tc->snd_mss > 0);
433 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
436 tcp_update_rcv_wnd (tc);
440 tcp_init_mss (tcp_connection_t * tc)
442 u16 default_min_mss = 536;
443 tcp_update_rcv_mss (tc);
445 /* TODO cache mss and consider PMTU discovery */
446 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
448 if (tc->snd_mss < 45)
450 clib_warning ("snd mss is 0");
451 /* Assume that at least the min default mss works */
452 tc->snd_mss = default_min_mss;
453 tc->rcv_opts.mss = default_min_mss;
456 /* We should have enough space for 40 bytes of options */
457 ASSERT (tc->snd_mss > 45);
459 /* If we use timestamp option, account for it */
460 if (tcp_opts_tstamp (&tc->rcv_opts))
461 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
465 tcp_alloc_tx_buffers (tcp_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted)
467 vlib_main_t *vm = vlib_get_main ();
470 ASSERT (wanted > *n_bufs);
471 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
472 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
475 _vec_len (wrk->tx_buffers) = *n_bufs;
480 tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx)
482 u16 n_bufs = vec_len (wrk->tx_buffers);
484 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index);
486 if (PREDICT_FALSE (!n_bufs))
488 if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE))
494 *bidx = wrk->tx_buffers[--n_bufs];
495 _vec_len (wrk->tx_buffers) = n_bufs;
500 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
502 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
503 vlib_buffer_free_one (vm, b->next_buffer);
504 /* Zero all flags but free list index and trace flag */
505 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
507 b->current_length = 0;
508 b->total_length_not_including_first_buffer = 0;
509 vnet_buffer (b)->tcp.flags = 0;
511 /* Leave enough space for headers */
512 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
516 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
518 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
519 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
520 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
521 b->total_length_not_including_first_buffer = 0;
523 vnet_buffer (b)->tcp.flags = 0;
524 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
525 /* Leave enough space for headers */
526 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
533 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
536 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
537 u8 tcp_opts_len, tcp_hdr_opts_len;
541 wnd = tcp_window_to_advertise (tc, state);
543 /* Make and write options */
544 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
545 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
547 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
548 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
550 tcp_options_write ((u8 *) (th + 1), snd_opts);
551 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
555 * Convert buffer to ACK
558 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
560 vlib_main_t *vm = vlib_get_main ();
562 tcp_reuse_buffer (vm, b);
563 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
564 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
565 tc->rcv_las = tc->rcv_nxt;
569 * Convert buffer to FIN-ACK
572 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
574 vlib_main_t *vm = vlib_get_main ();
577 tcp_reuse_buffer (vm, b);
579 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
580 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
582 /* Reset flags, make sure ack is sent */
583 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
587 * Convert buffer to SYN
590 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
592 u8 tcp_hdr_opts_len, tcp_opts_len;
595 tcp_options_t snd_opts;
597 initial_wnd = tcp_initial_window_to_advertise (tc);
599 /* Make and write options */
600 clib_memset (&snd_opts, 0, sizeof (snd_opts));
601 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
602 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
604 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
605 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
607 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
608 tcp_options_write ((u8 *) (th + 1), &snd_opts);
612 * Convert buffer to SYN-ACK
615 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
617 vlib_main_t *vm = vlib_get_main ();
618 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
619 u8 tcp_opts_len, tcp_hdr_opts_len;
623 clib_memset (snd_opts, 0, sizeof (*snd_opts));
624 tcp_reuse_buffer (vm, b);
626 initial_wnd = tcp_initial_window_to_advertise (tc);
627 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
628 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
630 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
631 tc->rcv_nxt, tcp_hdr_opts_len,
632 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
633 tcp_options_write ((u8 *) (th + 1), snd_opts);
635 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
637 /* Init retransmit timer. Use update instead of set because of
639 tcp_retransmit_timer_force_update (tc);
640 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
644 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
645 u8 is_ip4, u32 fib_index, u8 flush)
647 vlib_main_t *vm = wrk->vm;
648 u32 *to_next, next_index;
651 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
654 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
655 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
657 /* Send to IP lookup */
658 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
659 tcp_trajectory_add_start (b, 1);
661 f = wrk->ip_lookup_tx_frames[!is_ip4];
664 f = vlib_get_frame_to_node (vm, next_index);
666 wrk->ip_lookup_tx_frames[!is_ip4] = f;
669 to_next = vlib_frame_vector_args (f);
670 to_next[f->n_vectors] = bi;
672 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
674 vlib_put_frame_to_node (vm, next_index, f);
675 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
680 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
681 u32 bi, u8 is_ip4, u32 fib_index)
683 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
687 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
688 u8 is_ip4, u32 fib_index)
690 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
691 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
692 session_flush_frames_main_thread (wrk->vm);
696 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
699 u32 *to_next, next_index;
702 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
705 /* Decide where to send the packet */
706 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
707 tcp_trajectory_add_start (b, 2);
709 /* Get frame to v4/6 output node */
710 f = wrk->tx_frames[!is_ip4];
713 f = vlib_get_frame_to_node (wrk->vm, next_index);
715 wrk->tx_frames[!is_ip4] = f;
717 to_next = vlib_frame_vector_args (f);
718 to_next[f->n_vectors] = bi;
720 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
722 vlib_put_frame_to_node (wrk->vm, next_index, f);
723 wrk->tx_frames[!is_ip4] = 0;
728 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
731 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
735 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
738 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
742 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
743 tcp_state_t state, u8 thread_index, u8 is_ip4)
748 ip4_address_t src_ip40, dst_ip40;
749 ip6_address_t src_ip60, dst_ip60;
750 u16 src_port, dst_port;
755 /* Find IP and TCP headers */
756 th0 = tcp_buffer_hdr (b0);
758 /* Save src and dst ip */
761 ih4 = vlib_buffer_get_current (b0);
762 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
763 src_ip40.as_u32 = ih4->src_address.as_u32;
764 dst_ip40.as_u32 = ih4->dst_address.as_u32;
768 ih6 = vlib_buffer_get_current (b0);
769 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
770 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
771 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
774 src_port = th0->src_port;
775 dst_port = th0->dst_port;
777 /* Try to determine what/why we're actually resetting */
778 if (state == TCP_STATE_CLOSED)
783 tmp = clib_net_to_host_u32 (th0->seq_number);
785 /* Got a SYN for no listener. */
786 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
787 ack = clib_host_to_net_u32 (tmp + 1);
792 flags = TCP_FLAG_RST;
793 seq = th0->ack_number;
797 tcp_reuse_buffer (vm, b0);
798 tcp_trajectory_add_start (b0, 4);
799 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
800 sizeof (tcp_header_t), flags, 0);
804 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
806 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
811 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
813 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
821 * Send reset without reusing existing buffer
823 * It extracts connection info out of original packet
826 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
828 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
829 vlib_main_t *vm = wrk->vm;
831 u32 bi, sw_if_index, fib_index;
832 u8 tcp_hdr_len, flags = 0;
833 tcp_header_t *th, *pkt_th;
835 ip4_header_t *ih4, *pkt_ih4;
836 ip6_header_t *ih6, *pkt_ih6;
837 fib_protocol_t fib_proto;
839 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
842 b = vlib_get_buffer (vm, bi);
843 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
844 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
845 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
846 tcp_init_buffer (vm, b);
848 /* Make and write options */
849 tcp_hdr_len = sizeof (tcp_header_t);
853 pkt_ih4 = vlib_buffer_get_current (pkt);
854 pkt_th = ip4_next_header (pkt_ih4);
858 pkt_ih6 = vlib_buffer_get_current (pkt);
859 pkt_th = ip6_next_header (pkt_ih6);
862 if (tcp_ack (pkt_th))
864 flags = TCP_FLAG_RST;
865 seq = pkt_th->ack_number;
866 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
870 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
872 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
875 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
876 seq, ack, tcp_hdr_len, flags, 0);
878 /* Swap src and dst ip */
881 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
882 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
883 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
884 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
889 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
891 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
892 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
893 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
897 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
898 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
902 * Build and set reset packet for connection
905 tcp_send_reset (tcp_connection_t * tc)
907 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
908 vlib_main_t *vm = wrk->vm;
912 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
915 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
917 b = vlib_get_buffer (vm, bi);
918 tcp_init_buffer (vm, b);
920 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
921 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
922 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
923 flags = TCP_FLAG_RST;
924 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
925 tc->rcv_nxt, tcp_hdr_opts_len, flags,
927 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
928 ASSERT (opts_write_len == tc->snd_opts_len);
929 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
933 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
934 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
935 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
941 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
942 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
943 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
946 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
947 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
951 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
954 tcp_header_t *th = vlib_buffer_get_current (b);
955 vlib_main_t *vm = wrk->vm;
959 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
960 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
961 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
968 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
969 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
970 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
978 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
979 * The packet is not forwarded through tcpx_output to avoid doing lookups
980 * in the half_open pool.
983 tcp_send_syn (tcp_connection_t * tc)
985 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
986 vlib_main_t *vm = wrk->vm;
991 * Setup retransmit and establish timers before requesting buffer
992 * such that we can return if we've ran out.
994 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
995 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
996 tc->rto * TCP_TO_TIMER_TICK);
998 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1001 b = vlib_get_buffer (vm, bi);
1002 tcp_init_buffer (vm, b);
1003 tcp_make_syn (tc, b);
1005 /* Measure RTT with this */
1006 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
1007 tc->rtt_seq = tc->snd_nxt;
1010 tcp_push_ip_hdr (wrk, tc, b);
1011 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1012 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1016 tcp_send_synack (tcp_connection_t * tc)
1018 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1019 vlib_main_t *vm = wrk->vm;
1024 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1027 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1028 b = vlib_get_buffer (vm, bi);
1029 tcp_make_synack (tc, b);
1030 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1034 * Flush tx frame populated by retransmits and timer pops
1037 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1039 if (wrk->tx_frames[!is_ip4])
1042 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1043 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1044 wrk->tx_frames[!is_ip4] = 0;
1049 * Flush ip lookup tx frames populated by timer pops
1052 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1054 if (wrk->ip_lookup_tx_frames[!is_ip4])
1057 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1058 vlib_put_frame_to_node (wrk->vm, next_index,
1059 wrk->ip_lookup_tx_frames[!is_ip4]);
1060 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1065 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1068 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1070 tcp_flush_frame_to_output (wrk, 1);
1071 tcp_flush_frame_to_output (wrk, 0);
1072 tcp_flush_frame_to_ip_lookup (wrk, 1);
1073 tcp_flush_frame_to_ip_lookup (wrk, 0);
1080 tcp_send_fin (tcp_connection_t * tc)
1082 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1083 vlib_main_t *vm = wrk->vm;
1088 fin_snt = tc->flags & TCP_CONN_FINSNT;
1090 tc->snd_nxt = tc->snd_una;
1092 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1094 /* Out of buffers so program fin retransmit ASAP */
1095 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1099 tcp_retransmit_timer_force_update (tc);
1100 b = vlib_get_buffer (vm, bi);
1101 tcp_init_buffer (vm, b);
1102 tcp_make_fin (tc, b);
1103 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1104 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1109 tc->flags |= TCP_CONN_FINSNT;
1110 tc->flags &= ~TCP_CONN_FINPNDG;
1111 /* Account for the FIN */
1112 tc->snd_una_max += 1;
1113 tc->snd_nxt = tc->snd_una_max;
1117 tc->snd_nxt = tc->snd_una_max;
1122 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1126 case TCP_STATE_ESTABLISHED:
1127 case TCP_STATE_CLOSE_WAIT:
1128 return TCP_FLAG_ACK;
1129 case TCP_STATE_SYN_RCVD:
1130 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1131 case TCP_STATE_SYN_SENT:
1132 return TCP_FLAG_SYN;
1133 case TCP_STATE_LAST_ACK:
1134 case TCP_STATE_FIN_WAIT_1:
1135 if (tc->snd_nxt + 1 < tc->snd_una_max)
1136 return TCP_FLAG_ACK;
1138 return TCP_FLAG_FIN;
1140 clib_warning ("Shouldn't be here!");
1146 * Push TCP header and update connection variables
1149 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1150 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1152 u32 advertise_wnd, data_len;
1153 u8 tcp_hdr_opts_len, flags;
1154 tcp_main_t *tm = &tcp_main;
1157 data_len = b->current_length;
1158 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1159 data_len += b->total_length_not_including_first_buffer;
1161 vnet_buffer (b)->tcp.flags = 0;
1162 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1165 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1167 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1170 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1172 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1174 flags = tcp_make_state_flags (tc, next_state);
1175 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1177 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1178 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1179 flags |= TCP_FLAG_PSH;
1181 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1182 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1187 clib_memcpy_fast ((u8 *) (th + 1),
1188 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1193 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1194 ASSERT (len == tc->snd_opts_len);
1198 * Update connection variables
1201 tc->snd_nxt += data_len;
1202 tc->rcv_las = tc->rcv_nxt;
1204 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1208 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1210 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1212 tc->snd_una_max = tc->snd_nxt;
1213 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1214 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1215 /* If not tracking an ACK, start tracking */
1216 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1218 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1219 tc->rtt_seq = tc->snd_nxt;
1221 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1223 tcp_retransmit_timer_set (tc);
1226 tcp_trajectory_add_start (b, 3);
1231 tcp_send_ack (tcp_connection_t * tc)
1233 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1234 vlib_main_t *vm = wrk->vm;
1239 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1241 b = vlib_get_buffer (vm, bi);
1242 tcp_init_buffer (vm, b);
1244 /* Fill in the ACK */
1245 tcp_make_ack (tc, b);
1246 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1250 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1252 if (!(tc->flags & TCP_CONN_SNDACK))
1254 vec_add1 (wrk->pending_acks, tc->c_c_index);
1255 tc->flags |= TCP_CONN_SNDACK;
1260 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1262 if (!(tc->flags & TCP_CONN_SNDACK))
1264 vec_add1 (wrk->pending_acks, tc->c_c_index);
1265 tc->flags |= TCP_CONN_SNDACK;
1267 if (tc->pending_dupacks < 255)
1268 tc->pending_dupacks += 1;
1272 tcp_send_acks (tcp_worker_ctx_t * wrk)
1274 u32 thread_index, *pending_acks;
1275 tcp_connection_t *tc;
1278 if (!vec_len (wrk->pending_acks))
1281 thread_index = wrk->vm->thread_index;
1282 pending_acks = wrk->pending_acks;
1283 for (i = 0; i < vec_len (pending_acks); i++)
1285 tc = tcp_connection_get (pending_acks[i], thread_index);
1286 tc->flags &= ~TCP_CONN_SNDACK;
1287 n_acks = clib_max (1, tc->pending_dupacks);
1288 /* If we're supposed to send dupacks but have no ooo data
1289 * send only one ack */
1290 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1292 for (j = 0; j < n_acks; j++)
1294 tc->pending_dupacks = 0;
1296 _vec_len (wrk->pending_acks) = 0;
1300 * Delayed ack timer handler
1302 * Sends delayed ACK when timer expires
1305 tcp_timer_delack_handler (u32 index)
1307 u32 thread_index = vlib_get_thread_index ();
1308 tcp_connection_t *tc;
1310 tc = tcp_connection_get (index, thread_index);
1311 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1316 * Allocate a new buffer and build a new tcp segment
1318 * @param wrk tcp worker
1319 * @param tc connection for which the segment will be allocated
1320 * @param offset offset of the first byte in the tx fifo
1321 * @param max_deq_byte segment size
1322 * @param[out] b pointer to buffer allocated
1324 * @return the number of bytes in the segment or 0 if buffer cannot be
1325 * allocated or no data available
1328 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1329 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1331 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1333 vlib_main_t *vm = wrk->vm;
1337 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1342 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1345 * Allocate and fill in buffer(s)
1348 /* Easy case, buffer size greater than mss */
1349 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1351 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1353 *b = vlib_get_buffer (vm, bi);
1354 data = tcp_init_buffer (vm, *b);
1355 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1357 ASSERT (n_bytes == max_deq_bytes);
1358 b[0]->current_length = n_bytes;
1359 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1360 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1361 tc->snd_una_max = tc->snd_nxt;
1363 /* Split mss into multiple buffers */
1366 u32 chain_bi = ~0, n_bufs_per_seg;
1367 u16 n_peeked, len_to_deq, available_bufs;
1368 vlib_buffer_t *chain_b, *prev_b;
1371 /* Make sure we have enough buffers */
1372 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1373 available_bufs = vec_len (wrk->tx_buffers);
1374 if (n_bufs_per_seg > available_bufs)
1376 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1377 if (n_bufs_per_seg > available_bufs)
1384 (void) tcp_get_free_buffer_index (wrk, &bi);
1385 ASSERT (bi != (u32) ~ 0);
1386 *b = vlib_get_buffer (vm, bi);
1387 data = tcp_init_buffer (vm, *b);
1388 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1389 bytes_per_buffer - MAX_HDRS_LEN);
1390 b[0]->current_length = n_bytes;
1391 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1392 b[0]->total_length_not_including_first_buffer = 0;
1393 max_deq_bytes -= n_bytes;
1396 for (i = 1; i < n_bufs_per_seg; i++)
1399 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1400 tcp_get_free_buffer_index (wrk, &chain_bi);
1401 ASSERT (chain_bi != (u32) ~ 0);
1402 chain_b = vlib_get_buffer (vm, chain_bi);
1403 chain_b->current_data = 0;
1404 data = vlib_buffer_get_current (chain_b);
1405 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1406 offset + n_bytes, len_to_deq);
1407 ASSERT (n_peeked == len_to_deq);
1408 n_bytes += n_peeked;
1409 chain_b->current_length = n_peeked;
1410 chain_b->next_buffer = 0;
1412 /* update previous buffer */
1413 prev_b->next_buffer = chain_bi;
1414 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1416 max_deq_bytes -= n_peeked;
1417 b[0]->total_length_not_including_first_buffer += n_peeked;
1420 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1421 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1422 tc->snd_una_max = tc->snd_nxt;
1425 ASSERT (n_bytes > 0);
1426 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1432 * Build a retransmit segment
1434 * @return the number of bytes in the segment or 0 if there's nothing to
1438 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1439 tcp_connection_t * tc, u32 offset,
1440 u32 max_deq_bytes, vlib_buffer_t ** b)
1442 u32 start, available_bytes;
1445 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1446 ASSERT (max_deq_bytes != 0);
1449 * Make sure we can retransmit something
1451 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1452 ASSERT (available_bytes >= offset);
1453 available_bytes -= offset;
1454 if (!available_bytes)
1457 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1458 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1460 /* Start is beyond snd_congestion */
1461 start = tc->snd_una + offset;
1462 if (seq_geq (start, tc->snd_congestion))
1465 /* Don't overshoot snd_congestion */
1466 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1468 max_deq_bytes = tc->snd_congestion - start;
1469 if (max_deq_bytes == 0)
1473 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1477 if (tcp_in_fastrecovery (tc))
1478 tc->snd_rxt_bytes += n_bytes;
1481 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1486 * Reset congestion control, switch cwnd to loss window and try again.
1489 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1491 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1492 tc->prev_ssthresh = tc->ssthresh;
1493 tc->prev_cwnd = tc->cwnd;
1495 /* Cleanly recover cc (also clears up fast retransmit) */
1496 if (tcp_in_fastrecovery (tc))
1498 /* TODO be less aggressive about this */
1499 scoreboard_clear (&tc->sack_sb);
1500 tcp_cc_fastrecovery_exit (tc);
1503 /* Start again from the beginning */
1504 tc->cc_algo->congestion (tc);
1505 tc->cwnd = tcp_loss_wnd (tc);
1506 tc->snd_congestion = tc->snd_una_max;
1508 tc->cwnd_acc_bytes = 0;
1509 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1510 tcp_recovery_on (tc);
1514 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1516 u32 thread_index = vlib_get_thread_index ();
1517 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1518 vlib_main_t *vm = wrk->vm;
1519 tcp_connection_t *tc;
1520 vlib_buffer_t *b = 0;
1525 tc = tcp_half_open_connection_get (index);
1526 /* Note: the connection may have transitioned to ESTABLISHED... */
1527 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1529 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1533 tc = tcp_connection_get (index, thread_index);
1534 /* Note: the connection may have been closed and pool_put */
1535 if (PREDICT_FALSE (tc == 0 || tc->state < TCP_STATE_SYN_RCVD))
1537 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1540 if (tc->state >= TCP_STATE_ESTABLISHED)
1542 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1544 /* Lost FIN, retransmit and return */
1545 if (tcp_is_lost_fin (tc))
1549 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1553 /* Shouldn't be here. This condition is tricky because it has to take
1554 * into account boff > 0 due to persist timeout. */
1555 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1556 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1557 && !tcp_flight_size (tc)))
1559 ASSERT (!tcp_in_recovery (tc));
1564 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1565 * to persist timer timeout */
1566 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1569 tcp_update_rto (tc);
1572 /* Increment RTO backoff (also equal to number of retries) and go back
1573 * to first un-acked byte */
1576 /* First retransmit timeout */
1577 if (tc->rto_boff == 1)
1578 tcp_rxt_timeout_cc (tc);
1580 scoreboard_clear (&tc->sack_sb);
1582 /* If we've sent beyond snd_congestion, update it */
1583 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1584 tc->snd_congestion = tc->snd_una_max;
1586 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1587 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1589 /* Send one segment. Note that n_bytes may be zero due to buffer
1591 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1595 tcp_retransmit_timer_force_update (tc);
1599 bi = vlib_get_buffer_index (vm, b);
1601 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1602 if (tc->rto_boff == 1)
1603 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1605 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1606 tcp_retransmit_timer_force_update (tc);
1608 /* Retransmit for SYN */
1609 else if (tc->state == TCP_STATE_SYN_SENT)
1611 /* Half-open connection actually moved to established but we were
1612 * waiting for syn retransmit to pop to call cleanup from the right
1614 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1616 if (tcp_half_open_connection_cleanup (tc))
1618 clib_warning ("could not remove half-open connection");
1624 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1626 /* Try without increasing RTO a number of times. If this fails,
1627 * start growing RTO exponentially */
1629 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1630 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1632 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1633 tc->rto * TCP_TO_TIMER_TICK);
1635 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1638 b = vlib_get_buffer (vm, bi);
1639 tcp_init_buffer (vm, b);
1640 tcp_make_syn (tc, b);
1643 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1645 /* This goes straight to ipx_lookup. Retransmit timer set already */
1646 tcp_push_ip_hdr (wrk, tc, b);
1647 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1649 /* Retransmit SYN-ACK */
1650 else if (tc->state == TCP_STATE_SYN_RCVD)
1652 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1655 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1656 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1659 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1661 tcp_retransmit_timer_force_update (tc);
1665 b = vlib_get_buffer (vm, bi);
1666 tcp_init_buffer (vm, b);
1667 tcp_make_synack (tc, b);
1668 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1670 /* Retransmit timer already updated, just enqueue to output */
1671 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1675 ASSERT (tc->state == TCP_STATE_CLOSED);
1681 tcp_timer_retransmit_handler (u32 index)
1683 tcp_timer_retransmit_handler_i (index, 0);
1687 tcp_timer_retransmit_syn_handler (u32 index)
1689 tcp_timer_retransmit_handler_i (index, 1);
1693 * Got 0 snd_wnd from peer, try to do something about it.
1697 tcp_timer_persist_handler (u32 index)
1699 u32 thread_index = vlib_get_thread_index ();
1700 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1701 u32 bi, max_snd_bytes, available_bytes, offset;
1702 tcp_main_t *tm = vnet_get_tcp_main ();
1703 vlib_main_t *vm = wrk->vm;
1704 tcp_connection_t *tc;
1709 tc = tcp_connection_get_if_valid (index, thread_index);
1714 /* Make sure timer handle is set to invalid */
1715 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1717 /* Problem already solved or worse */
1718 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1719 || tc->snd_wnd > tc->snd_mss)
1722 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1723 offset = tc->snd_una_max - tc->snd_una;
1725 /* Reprogram persist if no new bytes available to send. We may have data
1727 if (!available_bytes)
1729 tcp_persist_timer_set (tc);
1733 if (available_bytes <= offset)
1735 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1739 /* Increment RTO backoff */
1741 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1744 * Try to force the first unsent segment (or buffer)
1746 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1748 tcp_persist_timer_set (tc);
1751 b = vlib_get_buffer (vm, bi);
1752 data = tcp_init_buffer (vm, b);
1754 tcp_validate_txf_size (tc, offset);
1755 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1756 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1757 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1759 b->current_length = n_bytes;
1760 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1761 || tc->snd_nxt == tc->snd_una_max
1762 || tc->rto_boff > 1));
1764 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1765 tc->snd_una_max = tc->snd_nxt;
1766 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1767 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1769 /* Just sent new data, enable retransmit */
1770 tcp_retransmit_timer_update (tc);
1774 * Retransmit first unacked segment
1777 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1779 u32 bi, old_snd_nxt, n_bytes;
1780 vlib_main_t *vm = wrk->vm;
1783 old_snd_nxt = tc->snd_nxt;
1784 tc->snd_nxt = tc->snd_una;
1786 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1788 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1792 bi = vlib_get_buffer_index (vm, b);
1793 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1794 tc->snd_nxt = old_snd_nxt;
1800 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1803 u32 offset, n_segs = 0, n_written, bi;
1804 vlib_main_t *vm = wrk->vm;
1805 vlib_buffer_t *b = 0;
1807 tc->snd_nxt = tc->snd_una_max;
1808 offset = tc->snd_una_max - tc->snd_una;
1809 while (n_segs < burst_size)
1811 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1815 bi = vlib_get_buffer_index (vm, b);
1816 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1817 offset += n_written;
1825 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1826 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1827 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1830 * Do fast retransmit with SACKs
1833 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1836 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1837 sack_scoreboard_hole_t *hole;
1838 vlib_main_t *vm = wrk->vm;
1839 vlib_buffer_t *b = 0;
1840 sack_scoreboard_t *sb;
1841 u32 bi, old_snd_nxt;
1844 u8 snd_limited = 0, can_rescue = 0;
1846 ASSERT (tcp_in_fastrecovery (tc));
1848 snd_space = tcp_available_cc_snd_space (tc);
1849 if (snd_space < tc->snd_mss)
1851 tcp_program_fastretransmit (wrk, tc);
1855 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1856 old_snd_nxt = tc->snd_nxt;
1858 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1860 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1861 max_deq -= tc->snd_una_max - tc->snd_una;
1863 while (snd_space > 0 && n_segs < burst_size)
1865 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1871 snd_space = clib_min (max_deq, snd_space);
1872 burst_size = clib_min (burst_size - n_segs,
1873 snd_space / tc->snd_mss);
1874 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1875 if (max_deq > n_segs_now * tc->snd_mss)
1876 tcp_program_fastretransmit (wrk, tc);
1877 n_segs += n_segs_now;
1881 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1884 /* If rescue rxt undefined or less than snd_una then one segment of
1885 * up to SMSS octets that MUST include the highest outstanding
1886 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1887 * RecoveryPoint. HighRxt MUST NOT be updated.
1889 max_bytes = clib_min (tc->snd_mss,
1890 tc->snd_congestion - tc->snd_una);
1891 max_bytes = clib_min (max_bytes, snd_space);
1892 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1893 sb->rescue_rxt = tc->snd_congestion;
1894 tc->snd_nxt = tc->snd_una + offset;
1895 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1900 bi = vlib_get_buffer_index (vm, b);
1901 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1906 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1907 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1911 offset = sb->high_rxt - tc->snd_una;
1912 tc->snd_nxt = sb->high_rxt;
1913 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1915 ASSERT (n_written <= snd_space);
1917 /* Nothing left to retransmit */
1921 bi = vlib_get_buffer_index (vm, b);
1922 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1924 sb->high_rxt += n_written;
1925 snd_space -= n_written;
1930 tcp_program_fastretransmit (wrk, tc);
1933 /* If window allows, send 1 SMSS of new data */
1934 tc->snd_nxt = old_snd_nxt;
1939 * Fast retransmit without SACK info
1942 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1945 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1946 vlib_main_t *vm = wrk->vm;
1947 int snd_space, n_segs = 0;
1950 ASSERT (tcp_in_fastrecovery (tc));
1951 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1952 old_snd_nxt = tc->snd_nxt;
1954 if (!tcp_fastrecovery_first (tc))
1957 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1959 snd_space = tc->sack_sb.last_bytes_delivered;
1960 tc->snd_nxt = tc->snd_una;
1961 while (snd_space > 0 && n_segs < burst_size)
1963 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1966 /* Nothing left to retransmit */
1970 bi = vlib_get_buffer_index (vm, b);
1971 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1972 snd_space -= n_written;
1973 offset += n_written;
1977 if (n_segs == burst_size)
1982 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1983 snd_space = tcp_available_cc_snd_space (tc);
1984 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1987 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1988 max_deq -= tc->snd_una_max - tc->snd_una;
1991 snd_space = clib_min (max_deq, snd_space);
1992 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1993 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1994 if (max_deq > n_segs_now * tc->snd_mss)
1995 tcp_program_fastretransmit (wrk, tc);
1996 n_segs += n_segs_now;
1999 /* Restore snd_nxt */
2000 tc->snd_nxt = old_snd_nxt;
2003 tcp_fastrecovery_first_off (tc);
2008 * Do fast retransmit
2011 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2014 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2015 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2017 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2021 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2022 u16 * next0, u32 * error0)
2024 ip_adjacency_t *adj;
2027 /* Not thread safe but as long as the connection exists the adj should
2029 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2031 if (ai == ADJ_INDEX_INVALID)
2033 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2034 *next0 = TCP_OUTPUT_NEXT_DROP;
2035 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2040 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2041 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2042 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2043 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2046 *next0 = TCP_OUTPUT_NEXT_DROP;
2047 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2049 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2053 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2054 u32 * to_next, u32 n_bufs)
2056 u32 n_trace = vlib_get_trace_count (vm, node);
2057 tcp_connection_t *tc;
2063 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2065 b = vlib_get_buffer (vm, to_next[i]);
2066 th = vlib_buffer_get_current (b);
2067 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2069 t = vlib_add_trace (vm, node, b, sizeof (*t));
2070 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2071 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2076 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2077 tcp_connection_t * tc0, u8 is_ip4)
2079 tcp_header_t *th0 = 0;
2081 th0 = vlib_buffer_get_current (b0);
2082 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2085 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2086 IP_PROTOCOL_TCP, 1);
2087 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2088 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2094 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2095 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2096 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2097 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2098 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2104 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2105 u32 * error0, u16 * next0, u8 is_ip4)
2108 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2110 *error0 = TCP_ERROR_INVALID_CONNECTION;
2111 *next0 = TCP_OUTPUT_NEXT_DROP;
2115 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2116 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2120 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2121 tcp_output_handle_link_local (tc0, b0, next0, error0);
2124 if (!TCP_ALWAYS_ACK)
2125 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2129 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2130 vlib_frame_t * frame, int is_ip4)
2132 u32 n_left_from, *from, thread_index = vm->thread_index;
2133 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2134 u16 nexts[VLIB_FRAME_SIZE], *next;
2136 from = vlib_frame_vector_args (frame);
2137 n_left_from = frame->n_vectors;
2138 tcp_set_time_now (tcp_get_worker (thread_index));
2140 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2141 tcp46_output_trace_frame (vm, node, from, n_left_from);
2143 vlib_get_buffers (vm, from, bufs, n_left_from);
2147 while (n_left_from >= 4)
2149 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2150 tcp_connection_t *tc0, *tc1;
2153 vlib_prefetch_buffer_header (b[2], STORE);
2154 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2156 vlib_prefetch_buffer_header (b[3], STORE);
2157 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2160 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2162 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2164 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2167 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2168 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2170 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2171 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2177 while (n_left_from > 0)
2179 u32 error0 = TCP_ERROR_PKTS_SENT;
2180 tcp_connection_t *tc0;
2182 if (n_left_from > 1)
2184 vlib_prefetch_buffer_header (b[1], STORE);
2185 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2188 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2189 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2192 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2193 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2200 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2201 return frame->n_vectors;
2205 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2206 vlib_frame_t * from_frame)
2208 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2212 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2213 vlib_frame_t * from_frame)
2215 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2219 VLIB_REGISTER_NODE (tcp4_output_node) =
2221 .function = tcp4_output,
2222 .name = "tcp4-output",
2223 /* Takes a vector of packets. */
2224 .vector_size = sizeof (u32),
2225 .n_errors = TCP_N_ERROR,
2226 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2227 .error_strings = tcp_error_strings,
2228 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2230 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2231 foreach_tcp4_output_next
2234 .format_buffer = format_tcp_header,
2235 .format_trace = format_tcp_tx_trace,
2239 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2242 VLIB_REGISTER_NODE (tcp6_output_node) =
2244 .function = tcp6_output,
2245 .name = "tcp6-output",
2246 /* Takes a vector of packets. */
2247 .vector_size = sizeof (u32),
2248 .n_errors = TCP_N_ERROR,
2249 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2250 .error_strings = tcp_error_strings,
2251 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2253 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2254 foreach_tcp6_output_next
2257 .format_buffer = format_tcp_header,
2258 .format_trace = format_tcp_tx_trace,
2262 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2264 typedef enum _tcp_reset_next
2266 TCP_RESET_NEXT_DROP,
2267 TCP_RESET_NEXT_IP_LOOKUP,
2271 #define foreach_tcp4_reset_next \
2272 _(DROP, "error-drop") \
2273 _(IP_LOOKUP, "ip4-lookup")
2275 #define foreach_tcp6_reset_next \
2276 _(DROP, "error-drop") \
2277 _(IP_LOOKUP, "ip6-lookup")
2280 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2281 vlib_frame_t * from_frame, u8 is_ip4)
2283 u32 n_left_from, next_index, *from, *to_next;
2284 u32 my_thread_index = vm->thread_index;
2286 from = vlib_frame_vector_args (from_frame);
2287 n_left_from = from_frame->n_vectors;
2289 next_index = node->cached_next_index;
2291 while (n_left_from > 0)
2295 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2297 while (n_left_from > 0 && n_left_to_next > 0)
2303 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2310 n_left_to_next -= 1;
2312 b0 = vlib_get_buffer (vm, bi0);
2314 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2315 my_thread_index, is_ip4))
2317 error0 = TCP_ERROR_LOOKUP_DROPS;
2318 next0 = TCP_RESET_NEXT_DROP;
2322 /* Prepare to send to IP lookup */
2323 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2324 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2327 b0->error = node->errors[error0];
2328 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2329 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2331 th0 = vlib_buffer_get_current (b0);
2333 th0 = ip4_next_header ((ip4_header_t *) th0);
2335 th0 = ip6_next_header ((ip6_header_t *) th0);
2336 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2337 clib_memcpy_fast (&t0->tcp_header, th0,
2338 sizeof (t0->tcp_header));
2341 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2342 n_left_to_next, bi0, next0);
2344 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2346 return from_frame->n_vectors;
2350 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2351 vlib_frame_t * from_frame)
2353 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2357 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2358 vlib_frame_t * from_frame)
2360 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2364 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2365 .function = tcp4_send_reset,
2366 .name = "tcp4-reset",
2367 .vector_size = sizeof (u32),
2368 .n_errors = TCP_N_ERROR,
2369 .error_strings = tcp_error_strings,
2370 .n_next_nodes = TCP_RESET_N_NEXT,
2372 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2373 foreach_tcp4_reset_next
2376 .format_trace = format_tcp_tx_trace,
2380 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2383 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2384 .function = tcp6_send_reset,
2385 .name = "tcp6-reset",
2386 .vector_size = sizeof (u32),
2387 .n_errors = TCP_N_ERROR,
2388 .error_strings = tcp_error_strings,
2389 .n_next_nodes = TCP_RESET_N_NEXT,
2391 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2392 foreach_tcp6_reset_next
2395 .format_trace = format_tcp_tx_trace,
2399 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2402 * fd.io coding-style-patch-verification: ON
2405 * eval: (c-set-style "gnu")