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_alloc_tx_buffers (tcp_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted)
470 vlib_main_t *vm = vlib_get_main ();
473 ASSERT (wanted > *n_bufs);
474 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
475 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
478 _vec_len (wrk->tx_buffers) = *n_bufs;
483 tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx)
485 u16 n_bufs = vec_len (wrk->tx_buffers);
487 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index);
489 if (PREDICT_FALSE (!n_bufs))
491 if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE))
497 *bidx = wrk->tx_buffers[--n_bufs];
498 _vec_len (wrk->tx_buffers) = n_bufs;
503 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
505 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
506 vlib_buffer_free_one (vm, b->next_buffer);
507 /* Zero all flags but free list index and trace flag */
508 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
510 b->current_length = 0;
511 b->total_length_not_including_first_buffer = 0;
512 vnet_buffer (b)->tcp.flags = 0;
514 /* Leave enough space for headers */
515 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
519 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
521 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
522 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
523 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
524 b->total_length_not_including_first_buffer = 0;
526 vnet_buffer (b)->tcp.flags = 0;
527 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
528 /* Leave enough space for headers */
529 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
536 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
539 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
540 u8 tcp_opts_len, tcp_hdr_opts_len;
544 wnd = tcp_window_to_advertise (tc, state);
546 /* Make and write options */
547 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
548 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
550 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
551 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
553 tcp_options_write ((u8 *) (th + 1), snd_opts);
554 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
558 * Convert buffer to ACK
561 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
563 vlib_main_t *vm = vlib_get_main ();
565 tcp_reuse_buffer (vm, b);
566 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
567 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
568 tc->rcv_las = tc->rcv_nxt;
572 * Convert buffer to FIN-ACK
575 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
577 vlib_main_t *vm = vlib_get_main ();
580 tcp_reuse_buffer (vm, b);
582 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
583 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
585 /* Reset flags, make sure ack is sent */
586 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
590 * Convert buffer to SYN
593 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
595 u8 tcp_hdr_opts_len, tcp_opts_len;
598 tcp_options_t snd_opts;
600 initial_wnd = tcp_initial_window_to_advertise (tc);
602 /* Make and write options */
603 clib_memset (&snd_opts, 0, sizeof (snd_opts));
604 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
605 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
607 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
608 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
610 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
611 tcp_options_write ((u8 *) (th + 1), &snd_opts);
615 * Convert buffer to SYN-ACK
618 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
620 vlib_main_t *vm = vlib_get_main ();
621 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
622 u8 tcp_opts_len, tcp_hdr_opts_len;
626 clib_memset (snd_opts, 0, sizeof (*snd_opts));
627 tcp_reuse_buffer (vm, b);
629 initial_wnd = tcp_initial_window_to_advertise (tc);
630 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
631 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
633 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
634 tc->rcv_nxt, tcp_hdr_opts_len,
635 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
636 tcp_options_write ((u8 *) (th + 1), snd_opts);
638 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
640 /* Init retransmit timer. Use update instead of set because of
642 tcp_retransmit_timer_force_update (tc);
643 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
647 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
648 u8 is_ip4, u32 fib_index, u8 flush)
650 vlib_main_t *vm = wrk->vm;
651 u32 *to_next, next_index;
654 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
657 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
658 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
660 /* Send to IP lookup */
661 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
662 tcp_trajectory_add_start (b, 1);
664 f = wrk->ip_lookup_tx_frames[!is_ip4];
667 f = vlib_get_frame_to_node (vm, next_index);
669 wrk->ip_lookup_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 (vm, next_index, f);
678 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
683 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
684 u32 bi, u8 is_ip4, u32 fib_index)
686 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
690 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
691 u8 is_ip4, u32 fib_index)
693 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
694 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
695 session_flush_frames_main_thread (wrk->vm);
699 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
702 u32 *to_next, next_index;
705 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
708 /* Decide where to send the packet */
709 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
710 tcp_trajectory_add_start (b, 2);
712 /* Get frame to v4/6 output node */
713 f = wrk->tx_frames[!is_ip4];
716 f = vlib_get_frame_to_node (wrk->vm, next_index);
718 wrk->tx_frames[!is_ip4] = f;
720 to_next = vlib_frame_vector_args (f);
721 to_next[f->n_vectors] = bi;
723 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
725 vlib_put_frame_to_node (wrk->vm, next_index, f);
726 wrk->tx_frames[!is_ip4] = 0;
731 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
734 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
738 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
741 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
745 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
746 tcp_state_t state, u8 thread_index, u8 is_ip4)
751 ip4_address_t src_ip40, dst_ip40;
752 ip6_address_t src_ip60, dst_ip60;
753 u16 src_port, dst_port;
758 /* Find IP and TCP headers */
759 th0 = tcp_buffer_hdr (b0);
761 /* Save src and dst ip */
764 ih4 = vlib_buffer_get_current (b0);
765 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
766 src_ip40.as_u32 = ih4->src_address.as_u32;
767 dst_ip40.as_u32 = ih4->dst_address.as_u32;
771 ih6 = vlib_buffer_get_current (b0);
772 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
773 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
774 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
777 src_port = th0->src_port;
778 dst_port = th0->dst_port;
780 /* Try to determine what/why we're actually resetting */
781 if (state == TCP_STATE_CLOSED)
786 tmp = clib_net_to_host_u32 (th0->seq_number);
788 /* Got a SYN for no listener. */
789 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
790 ack = clib_host_to_net_u32 (tmp + 1);
795 flags = TCP_FLAG_RST;
796 seq = th0->ack_number;
800 tcp_reuse_buffer (vm, b0);
801 tcp_trajectory_add_start (b0, 4);
802 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
803 sizeof (tcp_header_t), flags, 0);
807 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
809 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
814 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
816 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
824 * Send reset without reusing existing buffer
826 * It extracts connection info out of original packet
829 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
831 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
832 vlib_main_t *vm = wrk->vm;
834 u32 bi, sw_if_index, fib_index;
835 u8 tcp_hdr_len, flags = 0;
836 tcp_header_t *th, *pkt_th;
838 ip4_header_t *ih4, *pkt_ih4;
839 ip6_header_t *ih6, *pkt_ih6;
840 fib_protocol_t fib_proto;
842 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
845 b = vlib_get_buffer (vm, bi);
846 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
847 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
848 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
849 tcp_init_buffer (vm, b);
851 /* Make and write options */
852 tcp_hdr_len = sizeof (tcp_header_t);
856 pkt_ih4 = vlib_buffer_get_current (pkt);
857 pkt_th = ip4_next_header (pkt_ih4);
861 pkt_ih6 = vlib_buffer_get_current (pkt);
862 pkt_th = ip6_next_header (pkt_ih6);
865 if (tcp_ack (pkt_th))
867 flags = TCP_FLAG_RST;
868 seq = pkt_th->ack_number;
869 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
873 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
875 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
878 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
879 seq, ack, tcp_hdr_len, flags, 0);
881 /* Swap src and dst ip */
884 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
885 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
886 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
887 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
892 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
894 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
895 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
896 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
900 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
901 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
905 * Build and set reset packet for connection
908 tcp_send_reset (tcp_connection_t * tc)
910 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
911 vlib_main_t *vm = wrk->vm;
915 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
918 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
920 b = vlib_get_buffer (vm, bi);
921 tcp_init_buffer (vm, b);
923 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
924 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
925 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
926 flags = TCP_FLAG_RST;
927 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
928 tc->rcv_nxt, tcp_hdr_opts_len, flags,
930 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
931 ASSERT (opts_write_len == tc->snd_opts_len);
932 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
936 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
937 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
938 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
944 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
945 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
946 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
949 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
950 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
954 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
957 tcp_header_t *th = vlib_buffer_get_current (b);
958 vlib_main_t *vm = wrk->vm;
962 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
963 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
964 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
971 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
972 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
973 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
981 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
982 * The packet is not forwarded through tcpx_output to avoid doing lookups
983 * in the half_open pool.
986 tcp_send_syn (tcp_connection_t * tc)
988 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
989 vlib_main_t *vm = wrk->vm;
994 * Setup retransmit and establish timers before requesting buffer
995 * such that we can return if we've ran out.
997 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
998 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
999 tc->rto * TCP_TO_TIMER_TICK);
1001 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1004 b = vlib_get_buffer (vm, bi);
1005 tcp_init_buffer (vm, b);
1006 tcp_make_syn (tc, b);
1008 /* Measure RTT with this */
1009 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
1010 tc->rtt_seq = tc->snd_nxt;
1013 tcp_push_ip_hdr (wrk, tc, b);
1014 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1015 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1019 tcp_send_synack (tcp_connection_t * tc)
1021 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1022 vlib_main_t *vm = wrk->vm;
1027 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1030 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1031 b = vlib_get_buffer (vm, bi);
1032 tcp_make_synack (tc, b);
1033 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1037 * Flush tx frame populated by retransmits and timer pops
1040 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1042 if (wrk->tx_frames[!is_ip4])
1045 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1046 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1047 wrk->tx_frames[!is_ip4] = 0;
1052 * Flush ip lookup tx frames populated by timer pops
1055 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1057 if (wrk->ip_lookup_tx_frames[!is_ip4])
1060 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1061 vlib_put_frame_to_node (wrk->vm, next_index,
1062 wrk->ip_lookup_tx_frames[!is_ip4]);
1063 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1068 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1071 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1073 tcp_flush_frame_to_output (wrk, 1);
1074 tcp_flush_frame_to_output (wrk, 0);
1075 tcp_flush_frame_to_ip_lookup (wrk, 1);
1076 tcp_flush_frame_to_ip_lookup (wrk, 0);
1083 tcp_send_fin (tcp_connection_t * tc)
1085 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1086 vlib_main_t *vm = wrk->vm;
1091 fin_snt = tc->flags & TCP_CONN_FINSNT;
1093 tc->snd_nxt = tc->snd_una;
1095 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1097 /* Out of buffers so program fin retransmit ASAP */
1098 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1100 tc->snd_nxt = tc->snd_una_max;
1104 tcp_retransmit_timer_force_update (tc);
1105 b = vlib_get_buffer (vm, bi);
1106 tcp_init_buffer (vm, b);
1107 tcp_make_fin (tc, b);
1108 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1109 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1113 tc->flags |= TCP_CONN_FINSNT;
1114 tc->flags &= ~TCP_CONN_FINPNDG;
1115 /* Account for the FIN */
1116 tc->snd_una_max += 1;
1117 tc->snd_nxt = tc->snd_una_max;
1121 tc->snd_nxt = tc->snd_una_max;
1126 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1130 case TCP_STATE_ESTABLISHED:
1131 case TCP_STATE_CLOSE_WAIT:
1132 case TCP_STATE_TIME_WAIT:
1133 case TCP_STATE_FIN_WAIT_2:
1134 return TCP_FLAG_ACK;
1135 case TCP_STATE_SYN_RCVD:
1136 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1137 case TCP_STATE_SYN_SENT:
1138 return TCP_FLAG_SYN;
1139 case TCP_STATE_LAST_ACK:
1140 case TCP_STATE_FIN_WAIT_1:
1141 case TCP_STATE_CLOSING:
1142 if (tc->snd_nxt + 1 < tc->snd_una_max)
1143 return TCP_FLAG_ACK;
1145 return TCP_FLAG_FIN;
1147 clib_warning ("Shouldn't be here!");
1153 * Push TCP header and update connection variables
1156 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1157 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1159 u32 advertise_wnd, data_len;
1160 u8 tcp_hdr_opts_len, flags;
1161 tcp_main_t *tm = &tcp_main;
1164 data_len = b->current_length;
1165 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1166 data_len += b->total_length_not_including_first_buffer;
1168 vnet_buffer (b)->tcp.flags = 0;
1169 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1172 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1174 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1177 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1179 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1181 flags = tcp_make_state_flags (tc, next_state);
1182 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1184 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1185 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1186 flags |= TCP_FLAG_PSH;
1188 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1189 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1194 clib_memcpy_fast ((u8 *) (th + 1),
1195 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1200 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1201 ASSERT (len == tc->snd_opts_len);
1205 * Update connection variables
1208 tc->snd_nxt += data_len;
1209 tc->rcv_las = tc->rcv_nxt;
1211 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1215 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1217 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1219 tc->snd_una_max = tc->snd_nxt;
1220 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1221 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1222 /* If not tracking an ACK, start tracking */
1223 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1225 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1226 tc->rtt_seq = tc->snd_nxt;
1228 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1230 tcp_retransmit_timer_set (tc);
1233 tcp_trajectory_add_start (b, 3);
1238 tcp_send_ack (tcp_connection_t * tc)
1240 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1241 vlib_main_t *vm = wrk->vm;
1246 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1248 b = vlib_get_buffer (vm, bi);
1249 tcp_init_buffer (vm, b);
1251 /* Fill in the ACK */
1252 tcp_make_ack (tc, b);
1253 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1257 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1259 if (!(tc->flags & TCP_CONN_SNDACK))
1261 vec_add1 (wrk->pending_acks, tc->c_c_index);
1262 tc->flags |= TCP_CONN_SNDACK;
1267 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1269 if (!(tc->flags & TCP_CONN_SNDACK))
1271 vec_add1 (wrk->pending_acks, tc->c_c_index);
1272 tc->flags |= TCP_CONN_SNDACK;
1274 if (tc->pending_dupacks < 255)
1275 tc->pending_dupacks += 1;
1279 tcp_send_acks (tcp_worker_ctx_t * wrk)
1281 u32 thread_index, *pending_acks;
1282 tcp_connection_t *tc;
1285 if (!vec_len (wrk->pending_acks))
1288 thread_index = wrk->vm->thread_index;
1289 pending_acks = wrk->pending_acks;
1290 for (i = 0; i < vec_len (pending_acks); i++)
1292 tc = tcp_connection_get (pending_acks[i], thread_index);
1293 tc->flags &= ~TCP_CONN_SNDACK;
1294 n_acks = clib_max (1, tc->pending_dupacks);
1295 /* If we're supposed to send dupacks but have no ooo data
1296 * send only one ack */
1297 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1299 for (j = 0; j < n_acks; j++)
1301 tc->pending_dupacks = 0;
1303 _vec_len (wrk->pending_acks) = 0;
1307 * Delayed ack timer handler
1309 * Sends delayed ACK when timer expires
1312 tcp_timer_delack_handler (u32 index)
1314 u32 thread_index = vlib_get_thread_index ();
1315 tcp_connection_t *tc;
1317 tc = tcp_connection_get (index, thread_index);
1318 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1323 * Allocate a new buffer and build a new tcp segment
1325 * @param wrk tcp worker
1326 * @param tc connection for which the segment will be allocated
1327 * @param offset offset of the first byte in the tx fifo
1328 * @param max_deq_byte segment size
1329 * @param[out] b pointer to buffer allocated
1331 * @return the number of bytes in the segment or 0 if buffer cannot be
1332 * allocated or no data available
1335 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1336 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1338 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1340 vlib_main_t *vm = wrk->vm;
1344 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1349 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1352 * Allocate and fill in buffer(s)
1355 /* Easy case, buffer size greater than mss */
1356 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1358 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1360 *b = vlib_get_buffer (vm, bi);
1361 data = tcp_init_buffer (vm, *b);
1362 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1364 ASSERT (n_bytes == max_deq_bytes);
1365 b[0]->current_length = n_bytes;
1366 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1367 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1368 tc->snd_una_max = tc->snd_nxt;
1370 /* Split mss into multiple buffers */
1373 u32 chain_bi = ~0, n_bufs_per_seg;
1374 u16 n_peeked, len_to_deq, available_bufs;
1375 vlib_buffer_t *chain_b, *prev_b;
1378 /* Make sure we have enough buffers */
1379 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1380 available_bufs = vec_len (wrk->tx_buffers);
1381 if (n_bufs_per_seg > available_bufs)
1383 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1384 if (n_bufs_per_seg > available_bufs)
1391 (void) tcp_get_free_buffer_index (wrk, &bi);
1392 ASSERT (bi != (u32) ~ 0);
1393 *b = vlib_get_buffer (vm, bi);
1394 data = tcp_init_buffer (vm, *b);
1395 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1396 bytes_per_buffer - MAX_HDRS_LEN);
1397 b[0]->current_length = n_bytes;
1398 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1399 b[0]->total_length_not_including_first_buffer = 0;
1400 max_deq_bytes -= n_bytes;
1403 for (i = 1; i < n_bufs_per_seg; i++)
1406 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1407 tcp_get_free_buffer_index (wrk, &chain_bi);
1408 ASSERT (chain_bi != (u32) ~ 0);
1409 chain_b = vlib_get_buffer (vm, chain_bi);
1410 chain_b->current_data = 0;
1411 data = vlib_buffer_get_current (chain_b);
1412 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1413 offset + n_bytes, len_to_deq);
1414 ASSERT (n_peeked == len_to_deq);
1415 n_bytes += n_peeked;
1416 chain_b->current_length = n_peeked;
1417 chain_b->next_buffer = 0;
1419 /* update previous buffer */
1420 prev_b->next_buffer = chain_bi;
1421 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1423 max_deq_bytes -= n_peeked;
1424 b[0]->total_length_not_including_first_buffer += n_peeked;
1427 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1428 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1429 tc->snd_una_max = tc->snd_nxt;
1432 ASSERT (n_bytes > 0);
1433 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1439 * Build a retransmit segment
1441 * @return the number of bytes in the segment or 0 if there's nothing to
1445 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1446 tcp_connection_t * tc, u32 offset,
1447 u32 max_deq_bytes, vlib_buffer_t ** b)
1449 u32 start, available_bytes;
1452 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1453 ASSERT (max_deq_bytes != 0);
1456 * Make sure we can retransmit something
1458 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1459 ASSERT (available_bytes >= offset);
1460 available_bytes -= offset;
1461 if (!available_bytes)
1464 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1465 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1467 /* Start is beyond snd_congestion */
1468 start = tc->snd_una + offset;
1469 if (seq_geq (start, tc->snd_congestion))
1472 /* Don't overshoot snd_congestion */
1473 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1475 max_deq_bytes = tc->snd_congestion - start;
1476 if (max_deq_bytes == 0)
1480 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1484 if (tcp_in_fastrecovery (tc))
1485 tc->snd_rxt_bytes += n_bytes;
1488 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1493 * Reset congestion control, switch cwnd to loss window and try again.
1496 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1498 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1499 tc->prev_ssthresh = tc->ssthresh;
1500 tc->prev_cwnd = tc->cwnd;
1502 /* Cleanly recover cc (also clears up fast retransmit) */
1503 if (tcp_in_fastrecovery (tc))
1505 /* TODO be less aggressive about this */
1506 scoreboard_clear (&tc->sack_sb);
1507 tcp_cc_fastrecovery_exit (tc);
1510 /* Start again from the beginning */
1511 tc->cc_algo->congestion (tc);
1512 tc->cwnd = tcp_loss_wnd (tc);
1513 tc->snd_congestion = tc->snd_una_max;
1515 tc->cwnd_acc_bytes = 0;
1516 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1517 tcp_recovery_on (tc);
1521 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1523 u32 thread_index = vlib_get_thread_index ();
1524 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1525 vlib_main_t *vm = wrk->vm;
1526 tcp_connection_t *tc;
1527 vlib_buffer_t *b = 0;
1532 tc = tcp_half_open_connection_get (index);
1533 /* Note: the connection may have transitioned to ESTABLISHED... */
1534 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1536 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1540 tc = tcp_connection_get (index, thread_index);
1541 /* Note: the connection may have been closed and pool_put */
1542 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1544 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1545 /* Wait-close and retransmit could pop at the same time */
1546 if (tc->state == TCP_STATE_CLOSED)
1550 if (tc->state >= TCP_STATE_ESTABLISHED)
1552 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1554 /* Lost FIN, retransmit and return */
1555 if (tcp_is_lost_fin (tc))
1559 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1563 /* Shouldn't be here. This condition is tricky because it has to take
1564 * into account boff > 0 due to persist timeout. */
1565 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1566 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1567 && !tcp_flight_size (tc)))
1569 ASSERT (!tcp_in_recovery (tc));
1574 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1575 * to persist timer timeout */
1576 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1579 tcp_update_rto (tc);
1582 /* Increment RTO backoff (also equal to number of retries) and go back
1583 * to first un-acked byte */
1586 /* First retransmit timeout */
1587 if (tc->rto_boff == 1)
1588 tcp_rxt_timeout_cc (tc);
1590 scoreboard_clear (&tc->sack_sb);
1592 /* If we've sent beyond snd_congestion, update it */
1593 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1594 tc->snd_congestion = tc->snd_una_max;
1596 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1597 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1599 /* Send one segment. Note that n_bytes may be zero due to buffer
1601 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1604 tcp_retransmit_timer_force_update (tc);
1608 bi = vlib_get_buffer_index (vm, b);
1610 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1611 if (tc->rto_boff == 1)
1612 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1614 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1615 tcp_retransmit_timer_force_update (tc);
1617 /* Retransmit for SYN */
1618 else if (tc->state == TCP_STATE_SYN_SENT)
1620 /* Half-open connection actually moved to established but we were
1621 * waiting for syn retransmit to pop to call cleanup from the right
1623 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1625 if (tcp_half_open_connection_cleanup (tc))
1626 TCP_DBG ("could not remove half-open connection");
1630 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1632 /* Try without increasing RTO a number of times. If this fails,
1633 * start growing RTO exponentially */
1635 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1636 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1638 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1639 tc->rto * TCP_TO_TIMER_TICK);
1641 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1644 b = vlib_get_buffer (vm, bi);
1645 tcp_init_buffer (vm, b);
1646 tcp_make_syn (tc, b);
1649 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1651 /* This goes straight to ipx_lookup. Retransmit timer set already */
1652 tcp_push_ip_hdr (wrk, tc, b);
1653 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1655 /* Retransmit SYN-ACK */
1656 else if (tc->state == TCP_STATE_SYN_RCVD)
1658 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1661 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1662 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1665 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1667 tcp_retransmit_timer_force_update (tc);
1671 b = vlib_get_buffer (vm, bi);
1672 tcp_init_buffer (vm, b);
1673 tcp_make_synack (tc, b);
1674 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1676 /* Retransmit timer already updated, just enqueue to output */
1677 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1681 ASSERT (tc->state == TCP_STATE_CLOSED);
1687 tcp_timer_retransmit_handler (u32 index)
1689 tcp_timer_retransmit_handler_i (index, 0);
1693 tcp_timer_retransmit_syn_handler (u32 index)
1695 tcp_timer_retransmit_handler_i (index, 1);
1699 * Got 0 snd_wnd from peer, try to do something about it.
1703 tcp_timer_persist_handler (u32 index)
1705 u32 thread_index = vlib_get_thread_index ();
1706 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1707 u32 bi, max_snd_bytes, available_bytes, offset;
1708 tcp_main_t *tm = vnet_get_tcp_main ();
1709 vlib_main_t *vm = wrk->vm;
1710 tcp_connection_t *tc;
1715 tc = tcp_connection_get_if_valid (index, thread_index);
1720 /* Make sure timer handle is set to invalid */
1721 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1723 /* Problem already solved or worse */
1724 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1725 || tc->snd_wnd > tc->snd_mss)
1728 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1729 offset = tc->snd_una_max - tc->snd_una;
1731 /* Reprogram persist if no new bytes available to send. We may have data
1733 if (!available_bytes)
1735 tcp_persist_timer_set (tc);
1739 if (available_bytes <= offset)
1741 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1745 /* Increment RTO backoff */
1747 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1750 * Try to force the first unsent segment (or buffer)
1752 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1754 tcp_persist_timer_set (tc);
1757 b = vlib_get_buffer (vm, bi);
1758 data = tcp_init_buffer (vm, b);
1760 tcp_validate_txf_size (tc, offset);
1761 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1762 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1763 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1765 b->current_length = n_bytes;
1766 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1767 || tc->snd_nxt == tc->snd_una_max
1768 || tc->rto_boff > 1));
1770 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1771 tc->snd_una_max = tc->snd_nxt;
1772 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1773 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1775 /* Just sent new data, enable retransmit */
1776 tcp_retransmit_timer_update (tc);
1780 * Retransmit first unacked segment
1783 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1785 u32 bi, old_snd_nxt, n_bytes;
1786 vlib_main_t *vm = wrk->vm;
1789 old_snd_nxt = tc->snd_nxt;
1790 tc->snd_nxt = tc->snd_una;
1792 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1794 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1798 bi = vlib_get_buffer_index (vm, b);
1799 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1800 tc->snd_nxt = old_snd_nxt;
1806 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1809 u32 offset, n_segs = 0, n_written, bi;
1810 vlib_main_t *vm = wrk->vm;
1811 vlib_buffer_t *b = 0;
1813 tc->snd_nxt = tc->snd_una_max;
1814 offset = tc->snd_una_max - tc->snd_una;
1815 while (n_segs < burst_size)
1817 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1821 bi = vlib_get_buffer_index (vm, b);
1822 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1823 offset += n_written;
1831 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1832 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1833 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1836 * Do fast retransmit with SACKs
1839 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1842 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1843 sack_scoreboard_hole_t *hole;
1844 vlib_main_t *vm = wrk->vm;
1845 vlib_buffer_t *b = 0;
1846 sack_scoreboard_t *sb;
1847 u32 bi, old_snd_nxt;
1850 u8 snd_limited = 0, can_rescue = 0;
1852 ASSERT (tcp_in_fastrecovery (tc));
1854 snd_space = tcp_available_cc_snd_space (tc);
1855 if (snd_space < tc->snd_mss)
1857 tcp_program_fastretransmit (wrk, tc);
1861 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1862 old_snd_nxt = tc->snd_nxt;
1864 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1866 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1867 max_deq -= tc->snd_una_max - tc->snd_una;
1869 while (snd_space > 0 && n_segs < burst_size)
1871 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1877 snd_space = clib_min (max_deq, snd_space);
1878 burst_size = clib_min (burst_size - n_segs,
1879 snd_space / tc->snd_mss);
1880 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1881 if (max_deq > n_segs_now * tc->snd_mss)
1882 tcp_program_fastretransmit (wrk, tc);
1883 n_segs += n_segs_now;
1887 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1890 /* If rescue rxt undefined or less than snd_una then one segment of
1891 * up to SMSS octets that MUST include the highest outstanding
1892 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1893 * RecoveryPoint. HighRxt MUST NOT be updated.
1895 max_bytes = clib_min (tc->snd_mss,
1896 tc->snd_congestion - tc->snd_una);
1897 max_bytes = clib_min (max_bytes, snd_space);
1898 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1899 sb->rescue_rxt = tc->snd_congestion;
1900 tc->snd_nxt = tc->snd_una + offset;
1901 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1906 bi = vlib_get_buffer_index (vm, b);
1907 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1912 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1913 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1917 offset = sb->high_rxt - tc->snd_una;
1918 tc->snd_nxt = sb->high_rxt;
1919 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1921 ASSERT (n_written <= snd_space);
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);
1930 sb->high_rxt += n_written;
1931 snd_space -= n_written;
1936 tcp_program_fastretransmit (wrk, tc);
1939 /* If window allows, send 1 SMSS of new data */
1940 tc->snd_nxt = old_snd_nxt;
1945 * Fast retransmit without SACK info
1948 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1951 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1952 vlib_main_t *vm = wrk->vm;
1953 int snd_space, n_segs = 0;
1956 ASSERT (tcp_in_fastrecovery (tc));
1957 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1958 old_snd_nxt = tc->snd_nxt;
1960 if (!tcp_fastrecovery_first (tc))
1963 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1965 snd_space = tc->sack_sb.last_bytes_delivered;
1966 tc->snd_nxt = tc->snd_una;
1967 while (snd_space > 0 && n_segs < burst_size)
1969 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1972 /* Nothing left to retransmit */
1976 bi = vlib_get_buffer_index (vm, b);
1977 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1978 snd_space -= n_written;
1979 offset += n_written;
1983 if (n_segs == burst_size)
1988 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1989 snd_space = tcp_available_cc_snd_space (tc);
1990 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1993 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1994 max_deq -= tc->snd_una_max - tc->snd_una;
1997 snd_space = clib_min (max_deq, snd_space);
1998 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1999 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
2000 if (max_deq > n_segs_now * tc->snd_mss)
2001 tcp_program_fastretransmit (wrk, tc);
2002 n_segs += n_segs_now;
2005 /* Restore snd_nxt */
2006 tc->snd_nxt = old_snd_nxt;
2009 tcp_fastrecovery_first_off (tc);
2014 * Do fast retransmit
2017 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2020 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2021 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2023 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2027 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2028 u16 * next0, u32 * error0)
2030 ip_adjacency_t *adj;
2033 /* Not thread safe but as long as the connection exists the adj should
2035 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2037 if (ai == ADJ_INDEX_INVALID)
2039 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2040 *next0 = TCP_OUTPUT_NEXT_DROP;
2041 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2046 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2047 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2048 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2049 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2052 *next0 = TCP_OUTPUT_NEXT_DROP;
2053 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2055 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2059 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2060 u32 * to_next, u32 n_bufs)
2062 u32 n_trace = vlib_get_trace_count (vm, node);
2063 tcp_connection_t *tc;
2069 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2071 b = vlib_get_buffer (vm, to_next[i]);
2072 th = vlib_buffer_get_current (b);
2073 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2075 t = vlib_add_trace (vm, node, b, sizeof (*t));
2076 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2077 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2082 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2083 tcp_connection_t * tc0, u8 is_ip4)
2085 tcp_header_t *th0 = 0;
2087 th0 = vlib_buffer_get_current (b0);
2088 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2091 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2092 IP_PROTOCOL_TCP, 1);
2093 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2094 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2100 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2101 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2102 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2103 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2104 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2110 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2111 u32 * error0, u16 * next0, u8 is_ip4)
2114 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2116 *error0 = TCP_ERROR_INVALID_CONNECTION;
2117 *next0 = TCP_OUTPUT_NEXT_DROP;
2121 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2122 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2126 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2127 tcp_output_handle_link_local (tc0, b0, next0, error0);
2130 if (!TCP_ALWAYS_ACK)
2131 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2135 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2136 vlib_frame_t * frame, int is_ip4)
2138 u32 n_left_from, *from, thread_index = vm->thread_index;
2139 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2140 u16 nexts[VLIB_FRAME_SIZE], *next;
2142 from = vlib_frame_vector_args (frame);
2143 n_left_from = frame->n_vectors;
2144 tcp_set_time_now (tcp_get_worker (thread_index));
2146 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2147 tcp46_output_trace_frame (vm, node, from, n_left_from);
2149 vlib_get_buffers (vm, from, bufs, n_left_from);
2153 while (n_left_from >= 4)
2155 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2156 tcp_connection_t *tc0, *tc1;
2159 vlib_prefetch_buffer_header (b[2], STORE);
2160 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2162 vlib_prefetch_buffer_header (b[3], STORE);
2163 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2166 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2168 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2170 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2173 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2174 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2176 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2177 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2183 while (n_left_from > 0)
2185 u32 error0 = TCP_ERROR_PKTS_SENT;
2186 tcp_connection_t *tc0;
2188 if (n_left_from > 1)
2190 vlib_prefetch_buffer_header (b[1], STORE);
2191 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2194 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2195 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2198 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2199 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2206 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2207 return frame->n_vectors;
2211 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2212 vlib_frame_t * from_frame)
2214 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2218 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2219 vlib_frame_t * from_frame)
2221 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2225 VLIB_REGISTER_NODE (tcp4_output_node) =
2227 .function = tcp4_output,
2228 .name = "tcp4-output",
2229 /* Takes a vector of packets. */
2230 .vector_size = sizeof (u32),
2231 .n_errors = TCP_N_ERROR,
2232 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2233 .error_strings = tcp_error_strings,
2234 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2236 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2237 foreach_tcp4_output_next
2240 .format_buffer = format_tcp_header,
2241 .format_trace = format_tcp_tx_trace,
2245 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2248 VLIB_REGISTER_NODE (tcp6_output_node) =
2250 .function = tcp6_output,
2251 .name = "tcp6-output",
2252 /* Takes a vector of packets. */
2253 .vector_size = sizeof (u32),
2254 .n_errors = TCP_N_ERROR,
2255 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2256 .error_strings = tcp_error_strings,
2257 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2259 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2260 foreach_tcp6_output_next
2263 .format_buffer = format_tcp_header,
2264 .format_trace = format_tcp_tx_trace,
2268 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2270 typedef enum _tcp_reset_next
2272 TCP_RESET_NEXT_DROP,
2273 TCP_RESET_NEXT_IP_LOOKUP,
2277 #define foreach_tcp4_reset_next \
2278 _(DROP, "error-drop") \
2279 _(IP_LOOKUP, "ip4-lookup")
2281 #define foreach_tcp6_reset_next \
2282 _(DROP, "error-drop") \
2283 _(IP_LOOKUP, "ip6-lookup")
2286 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2287 vlib_frame_t * from_frame, u8 is_ip4)
2289 u32 n_left_from, next_index, *from, *to_next;
2290 u32 my_thread_index = vm->thread_index;
2292 from = vlib_frame_vector_args (from_frame);
2293 n_left_from = from_frame->n_vectors;
2295 next_index = node->cached_next_index;
2297 while (n_left_from > 0)
2301 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2303 while (n_left_from > 0 && n_left_to_next > 0)
2309 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2316 n_left_to_next -= 1;
2318 b0 = vlib_get_buffer (vm, bi0);
2320 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2321 my_thread_index, is_ip4))
2323 error0 = TCP_ERROR_LOOKUP_DROPS;
2324 next0 = TCP_RESET_NEXT_DROP;
2328 /* Prepare to send to IP lookup */
2329 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2330 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2333 b0->error = node->errors[error0];
2334 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2335 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2337 th0 = vlib_buffer_get_current (b0);
2339 th0 = ip4_next_header ((ip4_header_t *) th0);
2341 th0 = ip6_next_header ((ip6_header_t *) th0);
2342 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2343 clib_memcpy_fast (&t0->tcp_header, th0,
2344 sizeof (t0->tcp_header));
2347 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2348 n_left_to_next, bi0, next0);
2350 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2352 return from_frame->n_vectors;
2356 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2357 vlib_frame_t * from_frame)
2359 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2363 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2364 vlib_frame_t * from_frame)
2366 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2370 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2371 .function = tcp4_send_reset,
2372 .name = "tcp4-reset",
2373 .vector_size = sizeof (u32),
2374 .n_errors = TCP_N_ERROR,
2375 .error_strings = tcp_error_strings,
2376 .n_next_nodes = TCP_RESET_N_NEXT,
2378 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2379 foreach_tcp4_reset_next
2382 .format_trace = format_tcp_tx_trace,
2386 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2389 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2390 .function = tcp6_send_reset,
2391 .name = "tcp6-reset",
2392 .vector_size = sizeof (u32),
2393 .n_errors = TCP_N_ERROR,
2394 .error_strings = tcp_error_strings,
2395 .n_next_nodes = TCP_RESET_N_NEXT,
2397 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2398 foreach_tcp6_reset_next
2401 .format_trace = format_tcp_tx_trace,
2405 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2408 * fd.io coding-style-patch-verification: ON
2411 * eval: (c-set-style "gnu")