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 |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
523 b->total_length_not_including_first_buffer = 0;
525 vnet_buffer (b)->tcp.flags = 0;
526 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
527 /* Leave enough space for headers */
528 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
535 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
538 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
539 u8 tcp_opts_len, tcp_hdr_opts_len;
543 wnd = tcp_window_to_advertise (tc, state);
545 /* Make and write options */
546 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
547 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
549 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
550 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
552 tcp_options_write ((u8 *) (th + 1), snd_opts);
553 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
557 * Convert buffer to ACK
560 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
562 vlib_main_t *vm = vlib_get_main ();
564 tcp_reuse_buffer (vm, b);
565 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
566 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
567 tc->rcv_las = tc->rcv_nxt;
571 * Convert buffer to FIN-ACK
574 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
576 vlib_main_t *vm = vlib_get_main ();
579 tcp_reuse_buffer (vm, b);
581 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
582 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
584 /* Reset flags, make sure ack is sent */
585 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
589 * Convert buffer to SYN
592 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
594 u8 tcp_hdr_opts_len, tcp_opts_len;
597 tcp_options_t snd_opts;
599 initial_wnd = tcp_initial_window_to_advertise (tc);
601 /* Make and write options */
602 clib_memset (&snd_opts, 0, sizeof (snd_opts));
603 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
604 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
606 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
607 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
609 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
610 tcp_options_write ((u8 *) (th + 1), &snd_opts);
614 * Convert buffer to SYN-ACK
617 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
619 vlib_main_t *vm = vlib_get_main ();
620 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
621 u8 tcp_opts_len, tcp_hdr_opts_len;
625 clib_memset (snd_opts, 0, sizeof (*snd_opts));
626 tcp_reuse_buffer (vm, b);
628 initial_wnd = tcp_initial_window_to_advertise (tc);
629 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
630 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
632 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
633 tc->rcv_nxt, tcp_hdr_opts_len,
634 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
635 tcp_options_write ((u8 *) (th + 1), snd_opts);
637 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
639 /* Init retransmit timer. Use update instead of set because of
641 tcp_retransmit_timer_force_update (tc);
642 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
646 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
647 u8 is_ip4, u32 fib_index, u8 flush)
649 vlib_main_t *vm = wrk->vm;
650 u32 *to_next, next_index;
653 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
656 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
657 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
659 /* Send to IP lookup */
660 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
661 tcp_trajectory_add_start (b, 1);
663 f = wrk->ip_lookup_tx_frames[!is_ip4];
666 f = vlib_get_frame_to_node (vm, next_index);
668 wrk->ip_lookup_tx_frames[!is_ip4] = f;
671 to_next = vlib_frame_vector_args (f);
672 to_next[f->n_vectors] = bi;
674 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
676 vlib_put_frame_to_node (vm, next_index, f);
677 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
682 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
683 u32 bi, u8 is_ip4, u32 fib_index)
685 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
689 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
690 u8 is_ip4, u32 fib_index)
692 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
693 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
694 session_flush_frames_main_thread (wrk->vm);
698 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
701 u32 *to_next, next_index;
704 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
707 /* Decide where to send the packet */
708 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
709 tcp_trajectory_add_start (b, 2);
711 /* Get frame to v4/6 output node */
712 f = wrk->tx_frames[!is_ip4];
715 f = vlib_get_frame_to_node (wrk->vm, next_index);
717 wrk->tx_frames[!is_ip4] = f;
719 to_next = vlib_frame_vector_args (f);
720 to_next[f->n_vectors] = bi;
722 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
724 vlib_put_frame_to_node (wrk->vm, next_index, f);
725 wrk->tx_frames[!is_ip4] = 0;
730 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
733 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
737 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
740 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
744 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
745 tcp_state_t state, u8 thread_index, u8 is_ip4)
750 ip4_address_t src_ip40, dst_ip40;
751 ip6_address_t src_ip60, dst_ip60;
752 u16 src_port, dst_port;
757 /* Find IP and TCP headers */
758 th0 = tcp_buffer_hdr (b0);
760 /* Save src and dst ip */
763 ih4 = vlib_buffer_get_current (b0);
764 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
765 src_ip40.as_u32 = ih4->src_address.as_u32;
766 dst_ip40.as_u32 = ih4->dst_address.as_u32;
770 ih6 = vlib_buffer_get_current (b0);
771 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
772 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
773 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
776 src_port = th0->src_port;
777 dst_port = th0->dst_port;
779 /* Try to determine what/why we're actually resetting */
780 if (state == TCP_STATE_CLOSED)
785 tmp = clib_net_to_host_u32 (th0->seq_number);
787 /* Got a SYN for no listener. */
788 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
789 ack = clib_host_to_net_u32 (tmp + 1);
794 flags = TCP_FLAG_RST;
795 seq = th0->ack_number;
799 tcp_reuse_buffer (vm, b0);
800 tcp_trajectory_add_start (b0, 4);
801 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
802 sizeof (tcp_header_t), flags, 0);
806 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
808 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
813 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
815 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
823 * Send reset without reusing existing buffer
825 * It extracts connection info out of original packet
828 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
830 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
831 vlib_main_t *vm = wrk->vm;
833 u32 bi, sw_if_index, fib_index;
834 u8 tcp_hdr_len, flags = 0;
835 tcp_header_t *th, *pkt_th;
837 ip4_header_t *ih4, *pkt_ih4;
838 ip6_header_t *ih6, *pkt_ih6;
839 fib_protocol_t fib_proto;
841 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
844 b = vlib_get_buffer (vm, bi);
845 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
846 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
847 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
848 tcp_init_buffer (vm, b);
850 /* Make and write options */
851 tcp_hdr_len = sizeof (tcp_header_t);
855 pkt_ih4 = vlib_buffer_get_current (pkt);
856 pkt_th = ip4_next_header (pkt_ih4);
860 pkt_ih6 = vlib_buffer_get_current (pkt);
861 pkt_th = ip6_next_header (pkt_ih6);
864 if (tcp_ack (pkt_th))
866 flags = TCP_FLAG_RST;
867 seq = pkt_th->ack_number;
868 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
872 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
874 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
877 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
878 seq, ack, tcp_hdr_len, flags, 0);
880 /* Swap src and dst ip */
883 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
884 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
885 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
886 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
891 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
893 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
894 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
895 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
899 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
900 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
904 * Build and set reset packet for connection
907 tcp_send_reset (tcp_connection_t * tc)
909 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
910 vlib_main_t *vm = wrk->vm;
914 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
917 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
919 b = vlib_get_buffer (vm, bi);
920 tcp_init_buffer (vm, b);
922 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
923 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
924 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
925 flags = TCP_FLAG_RST;
926 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
927 tc->rcv_nxt, tcp_hdr_opts_len, flags,
929 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
930 ASSERT (opts_write_len == tc->snd_opts_len);
931 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
935 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
936 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
937 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
943 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
944 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
945 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
948 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
949 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
953 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
956 tcp_header_t *th = vlib_buffer_get_current (b);
957 vlib_main_t *vm = wrk->vm;
961 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
962 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
963 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
970 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
971 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
972 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
980 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
981 * The packet is not forwarded through tcpx_output to avoid doing lookups
982 * in the half_open pool.
985 tcp_send_syn (tcp_connection_t * tc)
987 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
988 vlib_main_t *vm = wrk->vm;
993 * Setup retransmit and establish timers before requesting buffer
994 * such that we can return if we've ran out.
996 tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
997 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
998 tc->rto * TCP_TO_TIMER_TICK);
1000 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1003 b = vlib_get_buffer (vm, bi);
1004 tcp_init_buffer (vm, b);
1005 tcp_make_syn (tc, b);
1007 /* Measure RTT with this */
1008 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
1009 tc->rtt_seq = tc->snd_nxt;
1012 tcp_push_ip_hdr (wrk, tc, b);
1013 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1014 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1018 tcp_send_synack (tcp_connection_t * tc)
1020 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1021 vlib_main_t *vm = wrk->vm;
1026 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1029 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1030 b = vlib_get_buffer (vm, bi);
1031 tcp_make_synack (tc, b);
1032 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1036 * Flush tx frame populated by retransmits and timer pops
1039 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1041 if (wrk->tx_frames[!is_ip4])
1044 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1045 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1046 wrk->tx_frames[!is_ip4] = 0;
1051 * Flush ip lookup tx frames populated by timer pops
1054 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1056 if (wrk->ip_lookup_tx_frames[!is_ip4])
1059 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1060 vlib_put_frame_to_node (wrk->vm, next_index,
1061 wrk->ip_lookup_tx_frames[!is_ip4]);
1062 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1067 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1070 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1072 tcp_flush_frame_to_output (wrk, 1);
1073 tcp_flush_frame_to_output (wrk, 0);
1074 tcp_flush_frame_to_ip_lookup (wrk, 1);
1075 tcp_flush_frame_to_ip_lookup (wrk, 0);
1082 tcp_send_fin (tcp_connection_t * tc)
1084 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1085 vlib_main_t *vm = wrk->vm;
1090 fin_snt = tc->flags & TCP_CONN_FINSNT;
1092 tc->snd_nxt = tc->snd_una;
1094 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1096 /* Out of buffers so program fin retransmit ASAP */
1097 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1099 tc->snd_nxt = tc->snd_una_max;
1103 tcp_retransmit_timer_force_update (tc);
1104 b = vlib_get_buffer (vm, bi);
1105 tcp_init_buffer (vm, b);
1106 tcp_make_fin (tc, b);
1107 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1108 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1112 tc->flags |= TCP_CONN_FINSNT;
1113 tc->flags &= ~TCP_CONN_FINPNDG;
1114 /* Account for the FIN */
1115 tc->snd_una_max += 1;
1116 tc->snd_nxt = tc->snd_una_max;
1120 tc->snd_nxt = tc->snd_una_max;
1125 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1129 case TCP_STATE_ESTABLISHED:
1130 case TCP_STATE_CLOSE_WAIT:
1131 case TCP_STATE_TIME_WAIT:
1132 case TCP_STATE_FIN_WAIT_2:
1133 return TCP_FLAG_ACK;
1134 case TCP_STATE_SYN_RCVD:
1135 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1136 case TCP_STATE_SYN_SENT:
1137 return TCP_FLAG_SYN;
1138 case TCP_STATE_LAST_ACK:
1139 case TCP_STATE_FIN_WAIT_1:
1140 case TCP_STATE_CLOSING:
1141 if (tc->snd_nxt + 1 < tc->snd_una_max)
1142 return TCP_FLAG_ACK;
1144 return TCP_FLAG_FIN;
1146 clib_warning ("Shouldn't be here!");
1152 * Push TCP header and update connection variables
1155 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1156 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1158 u32 advertise_wnd, data_len;
1159 u8 tcp_hdr_opts_len, flags;
1160 tcp_main_t *tm = &tcp_main;
1163 data_len = b->current_length;
1164 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1165 data_len += b->total_length_not_including_first_buffer;
1167 vnet_buffer (b)->tcp.flags = 0;
1168 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1171 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1173 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1176 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1178 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1180 flags = tcp_make_state_flags (tc, next_state);
1181 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1183 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1184 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1185 flags |= TCP_FLAG_PSH;
1187 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1188 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1193 clib_memcpy_fast ((u8 *) (th + 1),
1194 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1199 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1200 ASSERT (len == tc->snd_opts_len);
1204 * Update connection variables
1207 tc->snd_nxt += data_len;
1208 tc->rcv_las = tc->rcv_nxt;
1210 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1214 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1216 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1218 tc->snd_una_max = tc->snd_nxt;
1219 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1220 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1221 /* If not tracking an ACK, start tracking */
1222 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1224 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1225 tc->rtt_seq = tc->snd_nxt;
1227 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1229 tcp_retransmit_timer_set (tc);
1232 tcp_trajectory_add_start (b, 3);
1237 tcp_send_ack (tcp_connection_t * tc)
1239 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1240 vlib_main_t *vm = wrk->vm;
1245 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1247 b = vlib_get_buffer (vm, bi);
1248 tcp_init_buffer (vm, b);
1250 /* Fill in the ACK */
1251 tcp_make_ack (tc, b);
1252 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1256 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1258 if (!(tc->flags & TCP_CONN_SNDACK))
1260 vec_add1 (wrk->pending_acks, tc->c_c_index);
1261 tc->flags |= TCP_CONN_SNDACK;
1266 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1268 if (!(tc->flags & TCP_CONN_SNDACK))
1270 vec_add1 (wrk->pending_acks, tc->c_c_index);
1271 tc->flags |= TCP_CONN_SNDACK;
1273 if (tc->pending_dupacks < 255)
1274 tc->pending_dupacks += 1;
1278 tcp_send_acks (tcp_worker_ctx_t * wrk)
1280 u32 thread_index, *pending_acks;
1281 tcp_connection_t *tc;
1284 if (!vec_len (wrk->pending_acks))
1287 thread_index = wrk->vm->thread_index;
1288 pending_acks = wrk->pending_acks;
1289 for (i = 0; i < vec_len (pending_acks); i++)
1291 tc = tcp_connection_get (pending_acks[i], thread_index);
1292 tc->flags &= ~TCP_CONN_SNDACK;
1293 n_acks = clib_max (1, tc->pending_dupacks);
1294 /* If we're supposed to send dupacks but have no ooo data
1295 * send only one ack */
1296 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1298 for (j = 0; j < n_acks; j++)
1300 tc->pending_dupacks = 0;
1302 _vec_len (wrk->pending_acks) = 0;
1306 * Delayed ack timer handler
1308 * Sends delayed ACK when timer expires
1311 tcp_timer_delack_handler (u32 index)
1313 u32 thread_index = vlib_get_thread_index ();
1314 tcp_connection_t *tc;
1316 tc = tcp_connection_get (index, thread_index);
1317 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1322 * Allocate a new buffer and build a new tcp segment
1324 * @param wrk tcp worker
1325 * @param tc connection for which the segment will be allocated
1326 * @param offset offset of the first byte in the tx fifo
1327 * @param max_deq_byte segment size
1328 * @param[out] b pointer to buffer allocated
1330 * @return the number of bytes in the segment or 0 if buffer cannot be
1331 * allocated or no data available
1334 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1335 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1337 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1339 vlib_main_t *vm = wrk->vm;
1343 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1348 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1351 * Allocate and fill in buffer(s)
1354 /* Easy case, buffer size greater than mss */
1355 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1357 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1359 *b = vlib_get_buffer (vm, bi);
1360 data = tcp_init_buffer (vm, *b);
1361 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1363 ASSERT (n_bytes == max_deq_bytes);
1364 b[0]->current_length = n_bytes;
1365 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1366 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1367 tc->snd_una_max = tc->snd_nxt;
1369 /* Split mss into multiple buffers */
1372 u32 chain_bi = ~0, n_bufs_per_seg;
1373 u16 n_peeked, len_to_deq, available_bufs;
1374 vlib_buffer_t *chain_b, *prev_b;
1377 /* Make sure we have enough buffers */
1378 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1379 available_bufs = vec_len (wrk->tx_buffers);
1380 if (n_bufs_per_seg > available_bufs)
1382 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1383 if (n_bufs_per_seg > available_bufs)
1390 (void) tcp_get_free_buffer_index (wrk, &bi);
1391 ASSERT (bi != (u32) ~ 0);
1392 *b = vlib_get_buffer (vm, bi);
1393 data = tcp_init_buffer (vm, *b);
1394 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1395 bytes_per_buffer - MAX_HDRS_LEN);
1396 b[0]->current_length = n_bytes;
1397 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1398 b[0]->total_length_not_including_first_buffer = 0;
1399 max_deq_bytes -= n_bytes;
1402 for (i = 1; i < n_bufs_per_seg; i++)
1405 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1406 tcp_get_free_buffer_index (wrk, &chain_bi);
1407 ASSERT (chain_bi != (u32) ~ 0);
1408 chain_b = vlib_get_buffer (vm, chain_bi);
1409 chain_b->current_data = 0;
1410 data = vlib_buffer_get_current (chain_b);
1411 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1412 offset + n_bytes, len_to_deq);
1413 ASSERT (n_peeked == len_to_deq);
1414 n_bytes += n_peeked;
1415 chain_b->current_length = n_peeked;
1416 chain_b->next_buffer = 0;
1418 /* update previous buffer */
1419 prev_b->next_buffer = chain_bi;
1420 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1422 max_deq_bytes -= n_peeked;
1423 b[0]->total_length_not_including_first_buffer += n_peeked;
1426 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1427 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1428 tc->snd_una_max = tc->snd_nxt;
1431 ASSERT (n_bytes > 0);
1432 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1438 * Build a retransmit segment
1440 * @return the number of bytes in the segment or 0 if there's nothing to
1444 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1445 tcp_connection_t * tc, u32 offset,
1446 u32 max_deq_bytes, vlib_buffer_t ** b)
1448 u32 start, available_bytes;
1451 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1452 ASSERT (max_deq_bytes != 0);
1455 * Make sure we can retransmit something
1457 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1458 ASSERT (available_bytes >= offset);
1459 available_bytes -= offset;
1460 if (!available_bytes)
1463 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1464 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1466 /* Start is beyond snd_congestion */
1467 start = tc->snd_una + offset;
1468 if (seq_geq (start, tc->snd_congestion))
1471 /* Don't overshoot snd_congestion */
1472 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1474 max_deq_bytes = tc->snd_congestion - start;
1475 if (max_deq_bytes == 0)
1479 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1483 if (tcp_in_fastrecovery (tc))
1484 tc->snd_rxt_bytes += n_bytes;
1487 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1492 * Reset congestion control, switch cwnd to loss window and try again.
1495 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1497 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1498 tc->prev_ssthresh = tc->ssthresh;
1499 tc->prev_cwnd = tc->cwnd;
1501 /* Cleanly recover cc (also clears up fast retransmit) */
1502 if (tcp_in_fastrecovery (tc))
1504 /* TODO be less aggressive about this */
1505 scoreboard_clear (&tc->sack_sb);
1506 tcp_cc_fastrecovery_exit (tc);
1509 /* Start again from the beginning */
1510 tc->cc_algo->congestion (tc);
1511 tc->cwnd = tcp_loss_wnd (tc);
1512 tc->snd_congestion = tc->snd_una_max;
1514 tc->cwnd_acc_bytes = 0;
1515 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1516 tcp_recovery_on (tc);
1520 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1522 u32 thread_index = vlib_get_thread_index ();
1523 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1524 vlib_main_t *vm = wrk->vm;
1525 tcp_connection_t *tc;
1526 vlib_buffer_t *b = 0;
1531 tc = tcp_half_open_connection_get (index);
1532 /* Note: the connection may have transitioned to ESTABLISHED... */
1533 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1535 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1539 tc = tcp_connection_get (index, thread_index);
1540 /* Note: the connection may have been closed and pool_put */
1541 if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
1543 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1544 /* Wait-close and retransmit could pop at the same time */
1545 if (tc->state == TCP_STATE_CLOSED)
1549 if (tc->state >= TCP_STATE_ESTABLISHED)
1551 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1553 /* Lost FIN, retransmit and return */
1554 if (tcp_is_lost_fin (tc))
1558 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1562 /* Shouldn't be here. This condition is tricky because it has to take
1563 * into account boff > 0 due to persist timeout. */
1564 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1565 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1566 && !tcp_flight_size (tc)))
1568 ASSERT (!tcp_in_recovery (tc));
1573 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1574 * to persist timer timeout */
1575 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1578 tcp_update_rto (tc);
1581 /* Increment RTO backoff (also equal to number of retries) and go back
1582 * to first un-acked byte */
1585 /* First retransmit timeout */
1586 if (tc->rto_boff == 1)
1587 tcp_rxt_timeout_cc (tc);
1589 scoreboard_clear (&tc->sack_sb);
1591 /* If we've sent beyond snd_congestion, update it */
1592 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1593 tc->snd_congestion = tc->snd_una_max;
1595 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1596 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1598 /* Send one segment. Note that n_bytes may be zero due to buffer
1600 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1603 tcp_retransmit_timer_force_update (tc);
1607 bi = vlib_get_buffer_index (vm, b);
1609 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1610 if (tc->rto_boff == 1)
1611 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1613 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1614 tcp_retransmit_timer_force_update (tc);
1616 /* Retransmit for SYN */
1617 else if (tc->state == TCP_STATE_SYN_SENT)
1619 /* Half-open connection actually moved to established but we were
1620 * waiting for syn retransmit to pop to call cleanup from the right
1622 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1624 if (tcp_half_open_connection_cleanup (tc))
1625 TCP_DBG ("could not remove half-open connection");
1629 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1631 /* Try without increasing RTO a number of times. If this fails,
1632 * start growing RTO exponentially */
1634 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1635 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1637 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1638 tc->rto * TCP_TO_TIMER_TICK);
1640 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1643 b = vlib_get_buffer (vm, bi);
1644 tcp_init_buffer (vm, b);
1645 tcp_make_syn (tc, b);
1648 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1650 /* This goes straight to ipx_lookup. Retransmit timer set already */
1651 tcp_push_ip_hdr (wrk, tc, b);
1652 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1654 /* Retransmit SYN-ACK */
1655 else if (tc->state == TCP_STATE_SYN_RCVD)
1657 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1660 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1661 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1664 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1666 tcp_retransmit_timer_force_update (tc);
1670 b = vlib_get_buffer (vm, bi);
1671 tcp_init_buffer (vm, b);
1672 tcp_make_synack (tc, b);
1673 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1675 /* Retransmit timer already updated, just enqueue to output */
1676 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1680 ASSERT (tc->state == TCP_STATE_CLOSED);
1686 tcp_timer_retransmit_handler (u32 index)
1688 tcp_timer_retransmit_handler_i (index, 0);
1692 tcp_timer_retransmit_syn_handler (u32 index)
1694 tcp_timer_retransmit_handler_i (index, 1);
1698 * Got 0 snd_wnd from peer, try to do something about it.
1702 tcp_timer_persist_handler (u32 index)
1704 u32 thread_index = vlib_get_thread_index ();
1705 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1706 u32 bi, max_snd_bytes, available_bytes, offset;
1707 tcp_main_t *tm = vnet_get_tcp_main ();
1708 vlib_main_t *vm = wrk->vm;
1709 tcp_connection_t *tc;
1714 tc = tcp_connection_get_if_valid (index, thread_index);
1719 /* Make sure timer handle is set to invalid */
1720 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1722 /* Problem already solved or worse */
1723 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1724 || tc->snd_wnd > tc->snd_mss)
1727 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1728 offset = tc->snd_una_max - tc->snd_una;
1730 /* Reprogram persist if no new bytes available to send. We may have data
1732 if (!available_bytes)
1734 tcp_persist_timer_set (tc);
1738 if (available_bytes <= offset)
1740 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1744 /* Increment RTO backoff */
1746 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1749 * Try to force the first unsent segment (or buffer)
1751 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1753 tcp_persist_timer_set (tc);
1756 b = vlib_get_buffer (vm, bi);
1757 data = tcp_init_buffer (vm, b);
1759 tcp_validate_txf_size (tc, offset);
1760 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1761 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1762 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1764 b->current_length = n_bytes;
1765 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1766 || tc->snd_nxt == tc->snd_una_max
1767 || tc->rto_boff > 1));
1769 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1770 tc->snd_una_max = tc->snd_nxt;
1771 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1772 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1774 /* Just sent new data, enable retransmit */
1775 tcp_retransmit_timer_update (tc);
1779 * Retransmit first unacked segment
1782 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1784 u32 bi, old_snd_nxt, n_bytes;
1785 vlib_main_t *vm = wrk->vm;
1788 old_snd_nxt = tc->snd_nxt;
1789 tc->snd_nxt = tc->snd_una;
1791 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1793 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1797 bi = vlib_get_buffer_index (vm, b);
1798 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1799 tc->snd_nxt = old_snd_nxt;
1805 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1808 u32 offset, n_segs = 0, n_written, bi;
1809 vlib_main_t *vm = wrk->vm;
1810 vlib_buffer_t *b = 0;
1812 tc->snd_nxt = tc->snd_una_max;
1813 offset = tc->snd_una_max - tc->snd_una;
1814 while (n_segs < burst_size)
1816 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1820 bi = vlib_get_buffer_index (vm, b);
1821 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1822 offset += n_written;
1830 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1831 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1832 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1835 * Do fast retransmit with SACKs
1838 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1841 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1842 sack_scoreboard_hole_t *hole;
1843 vlib_main_t *vm = wrk->vm;
1844 vlib_buffer_t *b = 0;
1845 sack_scoreboard_t *sb;
1846 u32 bi, old_snd_nxt;
1849 u8 snd_limited = 0, can_rescue = 0;
1851 ASSERT (tcp_in_fastrecovery (tc));
1853 snd_space = tcp_available_cc_snd_space (tc);
1854 if (snd_space < tc->snd_mss)
1856 tcp_program_fastretransmit (wrk, tc);
1860 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1861 old_snd_nxt = tc->snd_nxt;
1863 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1865 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1866 max_deq -= tc->snd_una_max - tc->snd_una;
1868 while (snd_space > 0 && n_segs < burst_size)
1870 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1876 snd_space = clib_min (max_deq, snd_space);
1877 burst_size = clib_min (burst_size - n_segs,
1878 snd_space / tc->snd_mss);
1879 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1880 if (max_deq > n_segs_now * tc->snd_mss)
1881 tcp_program_fastretransmit (wrk, tc);
1882 n_segs += n_segs_now;
1886 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1889 /* If rescue rxt undefined or less than snd_una then one segment of
1890 * up to SMSS octets that MUST include the highest outstanding
1891 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1892 * RecoveryPoint. HighRxt MUST NOT be updated.
1894 max_bytes = clib_min (tc->snd_mss,
1895 tc->snd_congestion - tc->snd_una);
1896 max_bytes = clib_min (max_bytes, snd_space);
1897 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1898 sb->rescue_rxt = tc->snd_congestion;
1899 tc->snd_nxt = tc->snd_una + offset;
1900 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1905 bi = vlib_get_buffer_index (vm, b);
1906 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1911 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1912 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1916 offset = sb->high_rxt - tc->snd_una;
1917 tc->snd_nxt = sb->high_rxt;
1918 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1920 ASSERT (n_written <= snd_space);
1922 /* Nothing left to retransmit */
1926 bi = vlib_get_buffer_index (vm, b);
1927 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1929 sb->high_rxt += n_written;
1930 snd_space -= n_written;
1935 tcp_program_fastretransmit (wrk, tc);
1938 /* If window allows, send 1 SMSS of new data */
1939 tc->snd_nxt = old_snd_nxt;
1944 * Fast retransmit without SACK info
1947 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1950 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1951 vlib_main_t *vm = wrk->vm;
1952 int snd_space, n_segs = 0;
1955 ASSERT (tcp_in_fastrecovery (tc));
1956 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1957 old_snd_nxt = tc->snd_nxt;
1959 if (!tcp_fastrecovery_first (tc))
1962 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1964 snd_space = tc->sack_sb.last_bytes_delivered;
1965 tc->snd_nxt = tc->snd_una;
1966 while (snd_space > 0 && n_segs < burst_size)
1968 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1971 /* Nothing left to retransmit */
1975 bi = vlib_get_buffer_index (vm, b);
1976 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1977 snd_space -= n_written;
1978 offset += n_written;
1982 if (n_segs == burst_size)
1987 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1988 snd_space = tcp_available_cc_snd_space (tc);
1989 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1992 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1993 max_deq -= tc->snd_una_max - tc->snd_una;
1996 snd_space = clib_min (max_deq, snd_space);
1997 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1998 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1999 if (max_deq > n_segs_now * tc->snd_mss)
2000 tcp_program_fastretransmit (wrk, tc);
2001 n_segs += n_segs_now;
2004 /* Restore snd_nxt */
2005 tc->snd_nxt = old_snd_nxt;
2008 tcp_fastrecovery_first_off (tc);
2013 * Do fast retransmit
2016 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2019 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2020 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2022 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2026 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2027 u16 * next0, u32 * error0)
2029 ip_adjacency_t *adj;
2032 /* Not thread safe but as long as the connection exists the adj should
2034 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2036 if (ai == ADJ_INDEX_INVALID)
2038 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2039 *next0 = TCP_OUTPUT_NEXT_DROP;
2040 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2045 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2046 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2047 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2048 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2051 *next0 = TCP_OUTPUT_NEXT_DROP;
2052 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2054 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2058 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2059 u32 * to_next, u32 n_bufs)
2061 u32 n_trace = vlib_get_trace_count (vm, node);
2062 tcp_connection_t *tc;
2068 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2070 b = vlib_get_buffer (vm, to_next[i]);
2071 th = vlib_buffer_get_current (b);
2072 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2074 t = vlib_add_trace (vm, node, b, sizeof (*t));
2075 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2076 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2081 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2082 tcp_connection_t * tc0, u8 is_ip4)
2084 tcp_header_t *th0 = 0;
2086 th0 = vlib_buffer_get_current (b0);
2087 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2090 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2091 IP_PROTOCOL_TCP, 1);
2092 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2093 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2099 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2100 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2101 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2102 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2103 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2109 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2110 u32 * error0, u16 * next0, u8 is_ip4)
2113 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2115 *error0 = TCP_ERROR_INVALID_CONNECTION;
2116 *next0 = TCP_OUTPUT_NEXT_DROP;
2120 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2121 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2125 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2126 tcp_output_handle_link_local (tc0, b0, next0, error0);
2129 if (!TCP_ALWAYS_ACK)
2130 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2134 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2135 vlib_frame_t * frame, int is_ip4)
2137 u32 n_left_from, *from, thread_index = vm->thread_index;
2138 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2139 u16 nexts[VLIB_FRAME_SIZE], *next;
2141 from = vlib_frame_vector_args (frame);
2142 n_left_from = frame->n_vectors;
2143 tcp_set_time_now (tcp_get_worker (thread_index));
2145 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2146 tcp46_output_trace_frame (vm, node, from, n_left_from);
2148 vlib_get_buffers (vm, from, bufs, n_left_from);
2152 while (n_left_from >= 4)
2154 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2155 tcp_connection_t *tc0, *tc1;
2158 vlib_prefetch_buffer_header (b[2], STORE);
2159 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2161 vlib_prefetch_buffer_header (b[3], STORE);
2162 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2165 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2167 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2169 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2172 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2173 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2175 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2176 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2182 while (n_left_from > 0)
2184 u32 error0 = TCP_ERROR_PKTS_SENT;
2185 tcp_connection_t *tc0;
2187 if (n_left_from > 1)
2189 vlib_prefetch_buffer_header (b[1], STORE);
2190 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2193 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2194 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2197 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2198 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2205 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2206 return frame->n_vectors;
2210 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2211 vlib_frame_t * from_frame)
2213 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2217 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2218 vlib_frame_t * from_frame)
2220 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2224 VLIB_REGISTER_NODE (tcp4_output_node) =
2226 .function = tcp4_output,
2227 .name = "tcp4-output",
2228 /* Takes a vector of packets. */
2229 .vector_size = sizeof (u32),
2230 .n_errors = TCP_N_ERROR,
2231 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2232 .error_strings = tcp_error_strings,
2233 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2235 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2236 foreach_tcp4_output_next
2239 .format_buffer = format_tcp_header,
2240 .format_trace = format_tcp_tx_trace,
2244 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2247 VLIB_REGISTER_NODE (tcp6_output_node) =
2249 .function = tcp6_output,
2250 .name = "tcp6-output",
2251 /* Takes a vector of packets. */
2252 .vector_size = sizeof (u32),
2253 .n_errors = TCP_N_ERROR,
2254 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2255 .error_strings = tcp_error_strings,
2256 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2258 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2259 foreach_tcp6_output_next
2262 .format_buffer = format_tcp_header,
2263 .format_trace = format_tcp_tx_trace,
2267 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2269 typedef enum _tcp_reset_next
2271 TCP_RESET_NEXT_DROP,
2272 TCP_RESET_NEXT_IP_LOOKUP,
2276 #define foreach_tcp4_reset_next \
2277 _(DROP, "error-drop") \
2278 _(IP_LOOKUP, "ip4-lookup")
2280 #define foreach_tcp6_reset_next \
2281 _(DROP, "error-drop") \
2282 _(IP_LOOKUP, "ip6-lookup")
2285 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2286 vlib_frame_t * from_frame, u8 is_ip4)
2288 u32 n_left_from, next_index, *from, *to_next;
2289 u32 my_thread_index = vm->thread_index;
2291 from = vlib_frame_vector_args (from_frame);
2292 n_left_from = from_frame->n_vectors;
2294 next_index = node->cached_next_index;
2296 while (n_left_from > 0)
2300 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2302 while (n_left_from > 0 && n_left_to_next > 0)
2308 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2315 n_left_to_next -= 1;
2317 b0 = vlib_get_buffer (vm, bi0);
2319 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2320 my_thread_index, is_ip4))
2322 error0 = TCP_ERROR_LOOKUP_DROPS;
2323 next0 = TCP_RESET_NEXT_DROP;
2327 /* Prepare to send to IP lookup */
2328 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2329 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2332 b0->error = node->errors[error0];
2333 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2334 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2336 th0 = vlib_buffer_get_current (b0);
2338 th0 = ip4_next_header ((ip4_header_t *) th0);
2340 th0 = ip6_next_header ((ip6_header_t *) th0);
2341 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2342 clib_memcpy_fast (&t0->tcp_header, th0,
2343 sizeof (t0->tcp_header));
2346 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2347 n_left_to_next, bi0, next0);
2349 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2351 return from_frame->n_vectors;
2355 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2356 vlib_frame_t * from_frame)
2358 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2362 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2363 vlib_frame_t * from_frame)
2365 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2369 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2370 .function = tcp4_send_reset,
2371 .name = "tcp4-reset",
2372 .vector_size = sizeof (u32),
2373 .n_errors = TCP_N_ERROR,
2374 .error_strings = tcp_error_strings,
2375 .n_next_nodes = TCP_RESET_N_NEXT,
2377 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2378 foreach_tcp4_reset_next
2381 .format_trace = format_tcp_tx_trace,
2385 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2388 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2389 .function = tcp6_send_reset,
2390 .name = "tcp6-reset",
2391 .vector_size = sizeof (u32),
2392 .n_errors = TCP_N_ERROR,
2393 .error_strings = tcp_error_strings,
2394 .n_next_nodes = TCP_RESET_N_NEXT,
2396 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2397 foreach_tcp6_reset_next
2400 .format_trace = format_tcp_tx_trace,
2404 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2407 * fd.io coding-style-patch-verification: ON
2410 * eval: (c-set-style "gnu")