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 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
130 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
132 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
136 tcp_update_rcv_wnd (tcp_connection_t * tc)
139 u32 available_space, max_fifo, wnd;
142 * Figure out how much space we have available
144 available_space = transport_max_rx_enqueue (&tc->connection);
145 max_fifo = transport_rx_fifo_size (&tc->connection);
147 ASSERT (tc->rcv_opts.mss < max_fifo);
148 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
152 * Use the above and what we know about what we've previously advertised
153 * to compute the new window
155 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
156 if (observed_wnd < 0)
159 /* Bad. Thou shalt not shrink */
160 if (available_space < observed_wnd)
163 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
167 wnd = available_space;
170 /* Make sure we have a multiple of rcv_wscale */
171 if (wnd && tc->rcv_wscale)
173 wnd &= ~(1 << tc->rcv_wscale);
175 wnd = 1 << tc->rcv_wscale;
178 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
182 * Compute and return window to advertise, scaled as per RFC1323
185 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
187 if (state < TCP_STATE_ESTABLISHED)
188 return tcp_initial_window_to_advertise (tc);
190 tcp_update_rcv_wnd (tc);
192 if (tc->rcv_wnd == 0)
194 tc->flags |= TCP_CONN_SENT_RCV_WND0;
198 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
201 return tc->rcv_wnd >> tc->rcv_wscale;
205 * Write TCP options to segment.
208 tcp_options_write (u8 * data, tcp_options_t * opts)
211 u32 buf, seq_len = 4;
213 if (tcp_opts_mss (opts))
215 *data++ = TCP_OPTION_MSS;
216 *data++ = TCP_OPTION_LEN_MSS;
217 buf = clib_host_to_net_u16 (opts->mss);
218 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
219 data += sizeof (opts->mss);
220 opts_len += TCP_OPTION_LEN_MSS;
223 if (tcp_opts_wscale (opts))
225 *data++ = TCP_OPTION_WINDOW_SCALE;
226 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
227 *data++ = opts->wscale;
228 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
231 if (tcp_opts_sack_permitted (opts))
233 *data++ = TCP_OPTION_SACK_PERMITTED;
234 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
235 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
238 if (tcp_opts_tstamp (opts))
240 *data++ = TCP_OPTION_TIMESTAMP;
241 *data++ = TCP_OPTION_LEN_TIMESTAMP;
242 buf = clib_host_to_net_u32 (opts->tsval);
243 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
244 data += sizeof (opts->tsval);
245 buf = clib_host_to_net_u32 (opts->tsecr);
246 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
247 data += sizeof (opts->tsecr);
248 opts_len += TCP_OPTION_LEN_TIMESTAMP;
251 if (tcp_opts_sack (opts))
254 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
255 TCP_OPTS_MAX_SACK_BLOCKS);
257 if (n_sack_blocks != 0)
259 *data++ = TCP_OPTION_SACK_BLOCK;
260 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
261 for (i = 0; i < n_sack_blocks; i++)
263 buf = clib_host_to_net_u32 (opts->sacks[i].start);
264 clib_memcpy_fast (data, &buf, seq_len);
266 buf = clib_host_to_net_u32 (opts->sacks[i].end);
267 clib_memcpy_fast (data, &buf, seq_len);
270 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
274 /* Terminate TCP options */
277 *data++ = TCP_OPTION_EOL;
278 opts_len += TCP_OPTION_LEN_EOL;
281 /* Pad with zeroes to a u32 boundary */
284 *data++ = TCP_OPTION_NOOP;
285 opts_len += TCP_OPTION_LEN_NOOP;
291 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
295 opts->flags |= TCP_OPTS_FLAG_MSS;
296 opts->mss = dummy_mtu; /*XXX discover that */
297 len += TCP_OPTION_LEN_MSS;
299 opts->flags |= TCP_OPTS_FLAG_WSCALE;
300 opts->wscale = wnd_scale;
301 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
304 opts->tsval = tcp_time_now ();
306 len += TCP_OPTION_LEN_TIMESTAMP;
310 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
311 len += TCP_OPTION_LEN_SACK_PERMITTED;
314 /* Align to needed boundary */
315 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
320 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
324 opts->flags |= TCP_OPTS_FLAG_MSS;
326 len += TCP_OPTION_LEN_MSS;
328 if (tcp_opts_wscale (&tc->rcv_opts))
330 opts->flags |= TCP_OPTS_FLAG_WSCALE;
331 opts->wscale = tc->rcv_wscale;
332 len += TCP_OPTION_LEN_WINDOW_SCALE;
335 if (tcp_opts_tstamp (&tc->rcv_opts))
337 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
338 opts->tsval = tcp_time_now ();
339 opts->tsecr = tc->tsval_recent;
340 len += TCP_OPTION_LEN_TIMESTAMP;
343 if (tcp_opts_sack_permitted (&tc->rcv_opts))
345 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
346 len += TCP_OPTION_LEN_SACK_PERMITTED;
349 /* Align to needed boundary */
350 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
355 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
361 if (tcp_opts_tstamp (&tc->rcv_opts))
363 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
364 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
365 opts->tsecr = tc->tsval_recent;
366 len += TCP_OPTION_LEN_TIMESTAMP;
368 if (tcp_opts_sack_permitted (&tc->rcv_opts))
370 if (vec_len (tc->snd_sacks))
372 opts->flags |= TCP_OPTS_FLAG_SACK;
373 opts->sacks = tc->snd_sacks;
374 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
375 TCP_OPTS_MAX_SACK_BLOCKS);
376 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
380 /* Align to needed boundary */
381 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
386 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
391 case TCP_STATE_ESTABLISHED:
392 case TCP_STATE_FIN_WAIT_1:
393 case TCP_STATE_CLOSED:
394 case TCP_STATE_CLOSE_WAIT:
395 return tcp_make_established_options (tc, opts);
396 case TCP_STATE_SYN_RCVD:
397 return tcp_make_synack_options (tc, opts);
398 case TCP_STATE_SYN_SENT:
399 return tcp_make_syn_options (opts, tc->rcv_wscale);
401 clib_warning ("State not handled! %d", state);
407 * Update burst send vars
409 * - Updates snd_mss to reflect the effective segment size that we can send
410 * by taking into account all TCP options, including SACKs.
411 * - Cache 'on the wire' options for reuse
412 * - Updates receive window which can be reused for a burst.
414 * This should *only* be called when doing bursts
417 tcp_update_burst_snd_vars (tcp_connection_t * tc)
419 tcp_main_t *tm = &tcp_main;
421 /* Compute options to be used for connection. These may be reused when
422 * sending data or to compute the effective mss (snd_mss) */
423 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
424 TCP_STATE_ESTABLISHED);
426 /* XXX check if MTU has been updated */
427 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
428 ASSERT (tc->snd_mss > 0);
430 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
433 tcp_update_rcv_wnd (tc);
437 tcp_init_mss (tcp_connection_t * tc)
439 u16 default_min_mss = 536;
440 tcp_update_rcv_mss (tc);
442 /* TODO cache mss and consider PMTU discovery */
443 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
445 if (tc->snd_mss < 45)
447 clib_warning ("snd mss is 0");
448 /* Assume that at least the min default mss works */
449 tc->snd_mss = default_min_mss;
450 tc->rcv_opts.mss = default_min_mss;
453 /* We should have enough space for 40 bytes of options */
454 ASSERT (tc->snd_mss > 45);
456 /* If we use timestamp option, account for it */
457 if (tcp_opts_tstamp (&tc->rcv_opts))
458 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
462 tcp_alloc_tx_buffers (tcp_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted)
464 vlib_main_t *vm = vlib_get_main ();
467 ASSERT (wanted > *n_bufs);
468 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
469 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
472 _vec_len (wrk->tx_buffers) = *n_bufs;
477 tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx)
479 u16 n_bufs = vec_len (wrk->tx_buffers);
481 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index);
483 if (PREDICT_FALSE (!n_bufs))
485 if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE))
491 *bidx = wrk->tx_buffers[--n_bufs];
492 _vec_len (wrk->tx_buffers) = n_bufs;
497 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
499 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
500 vlib_buffer_free_one (vm, b->next_buffer);
501 /* Zero all flags but free list index and trace flag */
502 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
504 b->current_length = 0;
505 b->total_length_not_including_first_buffer = 0;
506 vnet_buffer (b)->tcp.flags = 0;
508 /* Leave enough space for headers */
509 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
513 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
515 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
516 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
517 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
518 b->total_length_not_including_first_buffer = 0;
520 vnet_buffer (b)->tcp.flags = 0;
521 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
522 /* Leave enough space for headers */
523 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
530 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
533 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
534 u8 tcp_opts_len, tcp_hdr_opts_len;
538 wnd = tcp_window_to_advertise (tc, state);
540 /* Make and write options */
541 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
542 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
544 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
545 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
547 tcp_options_write ((u8 *) (th + 1), snd_opts);
548 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
552 * Convert buffer to ACK
555 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
557 vlib_main_t *vm = vlib_get_main ();
559 tcp_reuse_buffer (vm, b);
560 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
561 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
562 tc->rcv_las = tc->rcv_nxt;
566 * Convert buffer to FIN-ACK
569 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
571 vlib_main_t *vm = vlib_get_main ();
574 tcp_reuse_buffer (vm, b);
576 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
577 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
579 /* Reset flags, make sure ack is sent */
580 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
584 * Convert buffer to SYN
587 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
589 u8 tcp_hdr_opts_len, tcp_opts_len;
592 tcp_options_t snd_opts;
594 initial_wnd = tcp_initial_window_to_advertise (tc);
596 /* Make and write options */
597 clib_memset (&snd_opts, 0, sizeof (snd_opts));
598 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
599 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
601 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
602 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
604 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
605 tcp_options_write ((u8 *) (th + 1), &snd_opts);
609 * Convert buffer to SYN-ACK
612 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
614 vlib_main_t *vm = vlib_get_main ();
615 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
616 u8 tcp_opts_len, tcp_hdr_opts_len;
620 clib_memset (snd_opts, 0, sizeof (*snd_opts));
621 tcp_reuse_buffer (vm, b);
623 initial_wnd = tcp_initial_window_to_advertise (tc);
624 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
625 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
627 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
628 tc->rcv_nxt, tcp_hdr_opts_len,
629 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
630 tcp_options_write ((u8 *) (th + 1), snd_opts);
632 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
634 /* Init retransmit timer. Use update instead of set because of
636 tcp_retransmit_timer_force_update (tc);
637 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
641 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
642 u8 is_ip4, u32 fib_index, u8 flush)
644 vlib_main_t *vm = wrk->vm;
645 u32 *to_next, next_index;
648 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
651 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
652 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
654 /* Send to IP lookup */
655 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
656 tcp_trajectory_add_start (b, 1);
658 f = wrk->ip_lookup_tx_frames[!is_ip4];
661 f = vlib_get_frame_to_node (vm, next_index);
663 wrk->ip_lookup_tx_frames[!is_ip4] = f;
666 to_next = vlib_frame_vector_args (f);
667 to_next[f->n_vectors] = bi;
669 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
671 vlib_put_frame_to_node (vm, next_index, f);
672 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
677 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
678 u32 bi, u8 is_ip4, u32 fib_index)
680 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
684 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
685 u8 is_ip4, u32 fib_index)
687 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
688 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
689 session_flush_frames_main_thread (wrk->vm);
693 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
696 u32 *to_next, next_index;
699 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
702 /* Decide where to send the packet */
703 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
704 tcp_trajectory_add_start (b, 2);
706 /* Get frame to v4/6 output node */
707 f = wrk->tx_frames[!is_ip4];
710 f = vlib_get_frame_to_node (wrk->vm, next_index);
712 wrk->tx_frames[!is_ip4] = f;
714 to_next = vlib_frame_vector_args (f);
715 to_next[f->n_vectors] = bi;
717 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
719 vlib_put_frame_to_node (wrk->vm, next_index, f);
720 wrk->tx_frames[!is_ip4] = 0;
725 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
728 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
732 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
735 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
739 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
740 tcp_state_t state, u8 thread_index, u8 is_ip4)
745 ip4_address_t src_ip40, dst_ip40;
746 ip6_address_t src_ip60, dst_ip60;
747 u16 src_port, dst_port;
752 /* Find IP and TCP headers */
753 th0 = tcp_buffer_hdr (b0);
755 /* Save src and dst ip */
758 ih4 = vlib_buffer_get_current (b0);
759 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
760 src_ip40.as_u32 = ih4->src_address.as_u32;
761 dst_ip40.as_u32 = ih4->dst_address.as_u32;
765 ih6 = vlib_buffer_get_current (b0);
766 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
767 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
768 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
771 src_port = th0->src_port;
772 dst_port = th0->dst_port;
774 /* Try to determine what/why we're actually resetting */
775 if (state == TCP_STATE_CLOSED)
780 tmp = clib_net_to_host_u32 (th0->seq_number);
782 /* Got a SYN for no listener. */
783 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
784 ack = clib_host_to_net_u32 (tmp + 1);
789 flags = TCP_FLAG_RST;
790 seq = th0->ack_number;
794 tcp_reuse_buffer (vm, b0);
795 tcp_trajectory_add_start (b0, 4);
796 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
797 sizeof (tcp_header_t), flags, 0);
801 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
803 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
808 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
810 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
818 * Send reset without reusing existing buffer
820 * It extracts connection info out of original packet
823 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
825 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
826 vlib_main_t *vm = wrk->vm;
828 u32 bi, sw_if_index, fib_index;
829 u8 tcp_hdr_len, flags = 0;
830 tcp_header_t *th, *pkt_th;
832 ip4_header_t *ih4, *pkt_ih4;
833 ip6_header_t *ih6, *pkt_ih6;
834 fib_protocol_t fib_proto;
836 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
839 b = vlib_get_buffer (vm, bi);
840 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
841 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
842 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
843 tcp_init_buffer (vm, b);
845 /* Make and write options */
846 tcp_hdr_len = sizeof (tcp_header_t);
850 pkt_ih4 = vlib_buffer_get_current (pkt);
851 pkt_th = ip4_next_header (pkt_ih4);
855 pkt_ih6 = vlib_buffer_get_current (pkt);
856 pkt_th = ip6_next_header (pkt_ih6);
859 if (tcp_ack (pkt_th))
861 flags = TCP_FLAG_RST;
862 seq = pkt_th->ack_number;
863 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
867 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
869 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
872 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
873 seq, ack, tcp_hdr_len, flags, 0);
875 /* Swap src and dst ip */
878 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
879 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
880 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
881 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
886 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
888 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
889 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
890 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
894 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
895 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
899 * Build and set reset packet for connection
902 tcp_send_reset (tcp_connection_t * tc)
904 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
905 vlib_main_t *vm = wrk->vm;
909 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
912 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
914 b = vlib_get_buffer (vm, bi);
915 tcp_init_buffer (vm, b);
917 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
918 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
919 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
920 flags = TCP_FLAG_RST;
921 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
922 tc->rcv_nxt, tcp_hdr_opts_len, flags,
924 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
925 ASSERT (opts_write_len == tc->snd_opts_len);
926 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
930 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
931 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
932 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
938 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
939 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
940 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
943 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
944 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
948 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
951 tcp_header_t *th = vlib_buffer_get_current (b);
952 vlib_main_t *vm = wrk->vm;
956 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
957 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
958 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
965 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
966 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
967 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
975 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
976 * The packet is not forwarded through tcpx_output to avoid doing lookups
977 * in the half_open pool.
980 tcp_send_syn (tcp_connection_t * tc)
982 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
983 vlib_main_t *vm = wrk->vm;
988 * Setup retransmit and establish timers before requesting buffer
989 * such that we can return if we've ran out.
991 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
992 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
993 tc->rto * TCP_TO_TIMER_TICK);
995 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
998 b = vlib_get_buffer (vm, bi);
999 tcp_init_buffer (vm, b);
1000 tcp_make_syn (tc, b);
1002 /* Measure RTT with this */
1003 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
1004 tc->rtt_seq = tc->snd_nxt;
1007 tcp_push_ip_hdr (wrk, tc, b);
1008 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1009 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1013 tcp_send_synack (tcp_connection_t * tc)
1015 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1016 vlib_main_t *vm = wrk->vm;
1021 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1024 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1025 b = vlib_get_buffer (vm, bi);
1026 tcp_make_synack (tc, b);
1027 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1031 * Flush tx frame populated by retransmits and timer pops
1034 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1036 if (wrk->tx_frames[!is_ip4])
1039 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1040 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1041 wrk->tx_frames[!is_ip4] = 0;
1046 * Flush ip lookup tx frames populated by timer pops
1049 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1051 if (wrk->ip_lookup_tx_frames[!is_ip4])
1054 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1055 vlib_put_frame_to_node (wrk->vm, next_index,
1056 wrk->ip_lookup_tx_frames[!is_ip4]);
1057 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1062 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1065 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1067 tcp_flush_frame_to_output (wrk, 1);
1068 tcp_flush_frame_to_output (wrk, 0);
1069 tcp_flush_frame_to_ip_lookup (wrk, 1);
1070 tcp_flush_frame_to_ip_lookup (wrk, 0);
1077 tcp_send_fin (tcp_connection_t * tc)
1079 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1080 vlib_main_t *vm = wrk->vm;
1085 fin_snt = tc->flags & TCP_CONN_FINSNT;
1087 tc->snd_nxt = tc->snd_una;
1089 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1091 /* Out of buffers so program fin retransmit ASAP */
1092 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1096 tcp_retransmit_timer_force_update (tc);
1097 b = vlib_get_buffer (vm, bi);
1098 tcp_init_buffer (vm, b);
1099 tcp_make_fin (tc, b);
1100 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1101 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1106 tc->flags |= TCP_CONN_FINSNT;
1107 tc->flags &= ~TCP_CONN_FINPNDG;
1108 /* Account for the FIN */
1109 tc->snd_una_max += 1;
1110 tc->snd_nxt = tc->snd_una_max;
1114 tc->snd_nxt = tc->snd_una_max;
1119 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1123 case TCP_STATE_ESTABLISHED:
1124 case TCP_STATE_CLOSE_WAIT:
1125 return TCP_FLAG_ACK;
1126 case TCP_STATE_SYN_RCVD:
1127 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1128 case TCP_STATE_SYN_SENT:
1129 return TCP_FLAG_SYN;
1130 case TCP_STATE_LAST_ACK:
1131 case TCP_STATE_FIN_WAIT_1:
1132 if (tc->snd_nxt + 1 < tc->snd_una_max)
1133 return TCP_FLAG_ACK;
1135 return TCP_FLAG_FIN;
1137 clib_warning ("Shouldn't be here!");
1143 * Push TCP header and update connection variables
1146 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1147 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1149 u32 advertise_wnd, data_len;
1150 u8 tcp_hdr_opts_len, flags;
1151 tcp_main_t *tm = &tcp_main;
1154 data_len = b->current_length;
1155 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1156 data_len += b->total_length_not_including_first_buffer;
1158 vnet_buffer (b)->tcp.flags = 0;
1159 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1162 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1164 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1167 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1169 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1171 flags = tcp_make_state_flags (tc, next_state);
1173 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1174 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1179 clib_memcpy_fast ((u8 *) (th + 1),
1180 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1185 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1186 ASSERT (len == tc->snd_opts_len);
1190 * Update connection variables
1193 tc->snd_nxt += data_len;
1194 tc->rcv_las = tc->rcv_nxt;
1196 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1200 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1202 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1204 tc->snd_una_max = tc->snd_nxt;
1205 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1206 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1207 /* If not tracking an ACK, start tracking */
1208 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1210 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1211 tc->rtt_seq = tc->snd_nxt;
1213 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1215 tcp_retransmit_timer_set (tc);
1218 tcp_trajectory_add_start (b, 3);
1223 tcp_send_ack (tcp_connection_t * tc)
1225 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1226 vlib_main_t *vm = wrk->vm;
1231 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1233 b = vlib_get_buffer (vm, bi);
1234 tcp_init_buffer (vm, b);
1236 /* Fill in the ACK */
1237 tcp_make_ack (tc, b);
1238 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1242 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1244 if (!(tc->flags & TCP_CONN_SNDACK))
1246 vec_add1 (wrk->pending_acks, tc->c_c_index);
1247 tc->flags |= TCP_CONN_SNDACK;
1252 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1254 if (!(tc->flags & TCP_CONN_SNDACK))
1256 vec_add1 (wrk->pending_acks, tc->c_c_index);
1257 tc->flags |= TCP_CONN_SNDACK;
1259 if (tc->pending_dupacks < 255)
1260 tc->pending_dupacks += 1;
1264 tcp_send_acks (tcp_worker_ctx_t * wrk)
1266 u32 thread_index, *pending_acks;
1267 tcp_connection_t *tc;
1270 if (!vec_len (wrk->pending_acks))
1273 thread_index = wrk->vm->thread_index;
1274 pending_acks = wrk->pending_acks;
1275 for (i = 0; i < vec_len (pending_acks); i++)
1277 tc = tcp_connection_get (pending_acks[i], thread_index);
1278 tc->flags &= ~TCP_CONN_SNDACK;
1279 n_acks = clib_max (1, tc->pending_dupacks);
1280 /* If we're supposed to send dupacks but have no ooo data
1281 * send only one ack */
1282 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1284 for (j = 0; j < n_acks; j++)
1286 tc->pending_dupacks = 0;
1288 _vec_len (wrk->pending_acks) = 0;
1292 * Delayed ack timer handler
1294 * Sends delayed ACK when timer expires
1297 tcp_timer_delack_handler (u32 index)
1299 u32 thread_index = vlib_get_thread_index ();
1300 tcp_connection_t *tc;
1302 tc = tcp_connection_get (index, thread_index);
1303 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1308 * Allocate a new buffer and build a new tcp segment
1310 * @param wrk tcp worker
1311 * @param tc connection for which the segment will be allocated
1312 * @param offset offset of the first byte in the tx fifo
1313 * @param max_deq_byte segment size
1314 * @param[out] b pointer to buffer allocated
1316 * @return the number of bytes in the segment or 0 if buffer cannot be
1317 * allocated or no data available
1320 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1321 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1323 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1325 vlib_main_t *vm = wrk->vm;
1329 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1334 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1337 * Allocate and fill in buffer(s)
1340 /* Easy case, buffer size greater than mss */
1341 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1343 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1345 *b = vlib_get_buffer (vm, bi);
1346 data = tcp_init_buffer (vm, *b);
1347 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1349 ASSERT (n_bytes == max_deq_bytes);
1350 b[0]->current_length = n_bytes;
1351 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1352 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1353 tc->snd_una_max = tc->snd_nxt;
1355 /* Split mss into multiple buffers */
1358 u32 chain_bi = ~0, n_bufs_per_seg;
1359 u16 n_peeked, len_to_deq, available_bufs;
1360 vlib_buffer_t *chain_b, *prev_b;
1363 /* Make sure we have enough buffers */
1364 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1365 available_bufs = vec_len (wrk->tx_buffers);
1366 if (n_bufs_per_seg > available_bufs)
1368 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1369 if (n_bufs_per_seg > available_bufs)
1376 (void) tcp_get_free_buffer_index (wrk, &bi);
1377 ASSERT (bi != (u32) ~ 0);
1378 *b = vlib_get_buffer (vm, bi);
1379 data = tcp_init_buffer (vm, *b);
1380 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1381 bytes_per_buffer - MAX_HDRS_LEN);
1382 b[0]->current_length = n_bytes;
1383 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1384 b[0]->total_length_not_including_first_buffer = 0;
1385 max_deq_bytes -= n_bytes;
1388 for (i = 1; i < n_bufs_per_seg; i++)
1391 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1392 tcp_get_free_buffer_index (wrk, &chain_bi);
1393 ASSERT (chain_bi != (u32) ~ 0);
1394 chain_b = vlib_get_buffer (vm, chain_bi);
1395 chain_b->current_data = 0;
1396 data = vlib_buffer_get_current (chain_b);
1397 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1398 offset + n_bytes, len_to_deq);
1399 ASSERT (n_peeked == len_to_deq);
1400 n_bytes += n_peeked;
1401 chain_b->current_length = n_peeked;
1402 chain_b->next_buffer = 0;
1404 /* update previous buffer */
1405 prev_b->next_buffer = chain_bi;
1406 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1408 max_deq_bytes -= n_peeked;
1409 b[0]->total_length_not_including_first_buffer += n_peeked;
1412 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1413 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1414 tc->snd_una_max = tc->snd_nxt;
1417 ASSERT (n_bytes > 0);
1418 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1424 * Build a retransmit segment
1426 * @return the number of bytes in the segment or 0 if there's nothing to
1430 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1431 tcp_connection_t * tc, u32 offset,
1432 u32 max_deq_bytes, vlib_buffer_t ** b)
1434 u32 start, available_bytes;
1437 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1438 ASSERT (max_deq_bytes != 0);
1441 * Make sure we can retransmit something
1443 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1444 ASSERT (available_bytes >= offset);
1445 available_bytes -= offset;
1446 if (!available_bytes)
1449 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1450 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1452 /* Start is beyond snd_congestion */
1453 start = tc->snd_una + offset;
1454 if (seq_geq (start, tc->snd_congestion))
1457 /* Don't overshoot snd_congestion */
1458 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1460 max_deq_bytes = tc->snd_congestion - start;
1461 if (max_deq_bytes == 0)
1465 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1469 if (tcp_in_fastrecovery (tc))
1470 tc->snd_rxt_bytes += n_bytes;
1473 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1478 * Reset congestion control, switch cwnd to loss window and try again.
1481 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1483 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1484 tc->prev_ssthresh = tc->ssthresh;
1485 tc->prev_cwnd = tc->cwnd;
1487 /* Cleanly recover cc (also clears up fast retransmit) */
1488 if (tcp_in_fastrecovery (tc))
1490 /* TODO be less aggressive about this */
1491 scoreboard_clear (&tc->sack_sb);
1492 tcp_cc_fastrecovery_exit (tc);
1495 /* Start again from the beginning */
1496 tc->cc_algo->congestion (tc);
1497 tc->cwnd = tcp_loss_wnd (tc);
1498 tc->snd_congestion = tc->snd_una_max;
1500 tc->cwnd_acc_bytes = 0;
1501 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1502 tcp_recovery_on (tc);
1506 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1508 u32 thread_index = vlib_get_thread_index ();
1509 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1510 vlib_main_t *vm = wrk->vm;
1511 tcp_connection_t *tc;
1512 vlib_buffer_t *b = 0;
1517 tc = tcp_half_open_connection_get (index);
1518 /* Note: the connection may have transitioned to ESTABLISHED... */
1519 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1521 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1525 tc = tcp_connection_get (index, thread_index);
1526 /* Note: the connection may have been closed and pool_put */
1527 if (PREDICT_FALSE (tc == 0 || tc->state < TCP_STATE_SYN_RCVD))
1529 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1532 if (tc->state >= TCP_STATE_ESTABLISHED)
1534 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1536 /* Lost FIN, retransmit and return */
1537 if (tcp_is_lost_fin (tc))
1541 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1545 /* Shouldn't be here. This condition is tricky because it has to take
1546 * into account boff > 0 due to persist timeout. */
1547 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1548 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1549 && !tcp_flight_size (tc)))
1551 ASSERT (!tcp_in_recovery (tc));
1556 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1557 * to persist timer timeout */
1558 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1561 tcp_update_rto (tc);
1564 /* Increment RTO backoff (also equal to number of retries) and go back
1565 * to first un-acked byte */
1568 /* First retransmit timeout */
1569 if (tc->rto_boff == 1)
1570 tcp_rxt_timeout_cc (tc);
1572 scoreboard_clear (&tc->sack_sb);
1574 /* If we've sent beyond snd_congestion, update it */
1575 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1576 tc->snd_congestion = tc->snd_una_max;
1578 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1579 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1581 /* Send one segment. Note that n_bytes may be zero due to buffer
1583 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1587 tcp_retransmit_timer_force_update (tc);
1591 bi = vlib_get_buffer_index (vm, b);
1593 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1594 if (tc->rto_boff == 1)
1595 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1597 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1598 tcp_retransmit_timer_force_update (tc);
1600 /* Retransmit for SYN */
1601 else if (tc->state == TCP_STATE_SYN_SENT)
1603 /* Half-open connection actually moved to established but we were
1604 * waiting for syn retransmit to pop to call cleanup from the right
1606 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1608 if (tcp_half_open_connection_cleanup (tc))
1610 clib_warning ("could not remove half-open connection");
1616 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1618 /* Try without increasing RTO a number of times. If this fails,
1619 * start growing RTO exponentially */
1621 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1622 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1624 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1625 tc->rto * TCP_TO_TIMER_TICK);
1627 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1630 b = vlib_get_buffer (vm, bi);
1631 tcp_init_buffer (vm, b);
1632 tcp_make_syn (tc, b);
1635 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1637 /* This goes straight to ipx_lookup. Retransmit timer set already */
1638 tcp_push_ip_hdr (wrk, tc, b);
1639 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1641 /* Retransmit SYN-ACK */
1642 else if (tc->state == TCP_STATE_SYN_RCVD)
1644 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1647 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1648 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1651 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1653 tcp_retransmit_timer_force_update (tc);
1657 b = vlib_get_buffer (vm, bi);
1658 tcp_init_buffer (vm, b);
1659 tcp_make_synack (tc, b);
1660 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1662 /* Retransmit timer already updated, just enqueue to output */
1663 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1667 ASSERT (tc->state == TCP_STATE_CLOSED);
1673 tcp_timer_retransmit_handler (u32 index)
1675 tcp_timer_retransmit_handler_i (index, 0);
1679 tcp_timer_retransmit_syn_handler (u32 index)
1681 tcp_timer_retransmit_handler_i (index, 1);
1685 * Got 0 snd_wnd from peer, try to do something about it.
1689 tcp_timer_persist_handler (u32 index)
1691 u32 thread_index = vlib_get_thread_index ();
1692 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1693 u32 bi, max_snd_bytes, available_bytes, offset;
1694 tcp_main_t *tm = vnet_get_tcp_main ();
1695 vlib_main_t *vm = wrk->vm;
1696 tcp_connection_t *tc;
1701 tc = tcp_connection_get_if_valid (index, thread_index);
1706 /* Make sure timer handle is set to invalid */
1707 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1709 /* Problem already solved or worse */
1710 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1711 || tc->snd_wnd > tc->snd_mss)
1714 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1715 offset = tc->snd_una_max - tc->snd_una;
1717 /* Reprogram persist if no new bytes available to send. We may have data
1719 if (!available_bytes)
1721 tcp_persist_timer_set (tc);
1725 if (available_bytes <= offset)
1727 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1731 /* Increment RTO backoff */
1733 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1736 * Try to force the first unsent segment (or buffer)
1738 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1740 tcp_persist_timer_set (tc);
1743 b = vlib_get_buffer (vm, bi);
1744 data = tcp_init_buffer (vm, b);
1746 tcp_validate_txf_size (tc, offset);
1747 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1748 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1749 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1751 b->current_length = n_bytes;
1752 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1753 || tc->snd_nxt == tc->snd_una_max
1754 || tc->rto_boff > 1));
1756 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1757 tc->snd_una_max = tc->snd_nxt;
1758 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1759 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1761 /* Just sent new data, enable retransmit */
1762 tcp_retransmit_timer_update (tc);
1766 * Retransmit first unacked segment
1769 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1771 u32 bi, old_snd_nxt, n_bytes;
1772 vlib_main_t *vm = wrk->vm;
1775 old_snd_nxt = tc->snd_nxt;
1776 tc->snd_nxt = tc->snd_una;
1778 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1780 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1784 bi = vlib_get_buffer_index (vm, b);
1785 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1786 tc->snd_nxt = old_snd_nxt;
1792 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1795 u32 offset, n_segs = 0, n_written, bi;
1796 vlib_main_t *vm = wrk->vm;
1797 vlib_buffer_t *b = 0;
1799 tc->snd_nxt = tc->snd_una_max;
1800 offset = tc->snd_una_max - tc->snd_una;
1801 while (n_segs < burst_size)
1803 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1807 bi = vlib_get_buffer_index (vm, b);
1808 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1809 offset += n_written;
1817 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1818 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1819 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1822 * Do fast retransmit with SACKs
1825 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1828 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1829 sack_scoreboard_hole_t *hole;
1830 vlib_main_t *vm = wrk->vm;
1831 vlib_buffer_t *b = 0;
1832 sack_scoreboard_t *sb;
1833 u32 bi, old_snd_nxt;
1836 u8 snd_limited = 0, can_rescue = 0;
1838 ASSERT (tcp_in_fastrecovery (tc));
1840 snd_space = tcp_available_cc_snd_space (tc);
1841 if (snd_space < tc->snd_mss)
1843 tcp_program_fastretransmit (wrk, tc);
1847 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1848 old_snd_nxt = tc->snd_nxt;
1850 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1852 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1853 max_deq -= tc->snd_una_max - tc->snd_una;
1855 while (snd_space > 0 && n_segs < burst_size)
1857 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1863 snd_space = clib_min (max_deq, snd_space);
1864 burst_size = clib_min (burst_size - n_segs,
1865 snd_space / tc->snd_mss);
1866 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1867 if (max_deq > n_segs_now * tc->snd_mss)
1868 tcp_program_fastretransmit (wrk, tc);
1869 n_segs += n_segs_now;
1873 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1876 /* If rescue rxt undefined or less than snd_una then one segment of
1877 * up to SMSS octets that MUST include the highest outstanding
1878 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1879 * RecoveryPoint. HighRxt MUST NOT be updated.
1881 max_bytes = clib_min (tc->snd_mss,
1882 tc->snd_congestion - tc->snd_una);
1883 max_bytes = clib_min (max_bytes, snd_space);
1884 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1885 sb->rescue_rxt = tc->snd_congestion;
1886 tc->snd_nxt = tc->snd_una + offset;
1887 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1892 bi = vlib_get_buffer_index (vm, b);
1893 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1898 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1899 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1903 offset = sb->high_rxt - tc->snd_una;
1904 tc->snd_nxt = sb->high_rxt;
1905 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1907 ASSERT (n_written <= snd_space);
1909 /* Nothing left to retransmit */
1913 bi = vlib_get_buffer_index (vm, b);
1914 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1916 sb->high_rxt += n_written;
1917 snd_space -= n_written;
1922 tcp_program_fastretransmit (wrk, tc);
1925 /* If window allows, send 1 SMSS of new data */
1926 tc->snd_nxt = old_snd_nxt;
1931 * Fast retransmit without SACK info
1934 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1937 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1938 vlib_main_t *vm = wrk->vm;
1939 int snd_space, n_segs = 0;
1942 ASSERT (tcp_in_fastrecovery (tc));
1943 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1944 old_snd_nxt = tc->snd_nxt;
1946 if (!tcp_fastrecovery_first (tc))
1949 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1951 snd_space = tc->sack_sb.last_bytes_delivered;
1952 tc->snd_nxt = tc->snd_una;
1953 while (snd_space > 0 && n_segs < burst_size)
1955 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1958 /* Nothing left to retransmit */
1962 bi = vlib_get_buffer_index (vm, b);
1963 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1964 snd_space -= n_written;
1965 offset += n_written;
1969 if (n_segs == burst_size)
1974 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1975 snd_space = tcp_available_cc_snd_space (tc);
1976 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1979 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1980 max_deq -= tc->snd_una_max - tc->snd_una;
1983 snd_space = clib_min (max_deq, snd_space);
1984 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1985 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1986 if (max_deq > n_segs_now * tc->snd_mss)
1987 tcp_program_fastretransmit (wrk, tc);
1988 n_segs += n_segs_now;
1991 /* Restore snd_nxt */
1992 tc->snd_nxt = old_snd_nxt;
1995 tcp_fastrecovery_first_off (tc);
2000 * Do fast retransmit
2003 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2006 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2007 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2009 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2013 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2014 u16 * next0, u32 * error0)
2016 ip_adjacency_t *adj;
2019 /* Not thread safe but as long as the connection exists the adj should
2021 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2023 if (ai == ADJ_INDEX_INVALID)
2025 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2026 *next0 = TCP_OUTPUT_NEXT_DROP;
2027 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2032 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2033 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2034 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2035 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2038 *next0 = TCP_OUTPUT_NEXT_DROP;
2039 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2041 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2045 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2046 u32 * to_next, u32 n_bufs)
2048 u32 n_trace = vlib_get_trace_count (vm, node);
2049 tcp_connection_t *tc;
2055 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2057 b = vlib_get_buffer (vm, to_next[i]);
2058 th = vlib_buffer_get_current (b);
2059 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2061 t = vlib_add_trace (vm, node, b, sizeof (*t));
2062 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2063 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2068 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2069 tcp_connection_t * tc0, u8 is_ip4)
2071 tcp_header_t *th0 = 0;
2073 th0 = vlib_buffer_get_current (b0);
2074 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2077 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2078 IP_PROTOCOL_TCP, 1);
2079 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2080 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2086 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2087 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2088 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2089 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2090 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2096 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2097 u32 * error0, u16 * next0, u8 is_ip4)
2100 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2102 *error0 = TCP_ERROR_INVALID_CONNECTION;
2103 *next0 = TCP_OUTPUT_NEXT_DROP;
2107 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2108 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2112 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2113 tcp_output_handle_link_local (tc0, b0, next0, error0);
2116 if (!TCP_ALWAYS_ACK)
2117 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2121 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2122 vlib_frame_t * frame, int is_ip4)
2124 u32 n_left_from, *from, thread_index = vm->thread_index;
2125 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2126 u16 nexts[VLIB_FRAME_SIZE], *next;
2128 from = vlib_frame_vector_args (frame);
2129 n_left_from = frame->n_vectors;
2130 tcp_set_time_now (tcp_get_worker (thread_index));
2132 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2133 tcp46_output_trace_frame (vm, node, from, n_left_from);
2135 vlib_get_buffers (vm, from, bufs, n_left_from);
2139 while (n_left_from >= 4)
2141 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2142 tcp_connection_t *tc0, *tc1;
2145 vlib_prefetch_buffer_header (b[2], STORE);
2146 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2148 vlib_prefetch_buffer_header (b[3], STORE);
2149 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2152 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2154 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2156 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2159 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2160 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2162 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2163 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2169 while (n_left_from > 0)
2171 u32 error0 = TCP_ERROR_PKTS_SENT;
2172 tcp_connection_t *tc0;
2174 if (n_left_from > 1)
2176 vlib_prefetch_buffer_header (b[1], STORE);
2177 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2180 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2181 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2184 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2185 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2192 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2193 return frame->n_vectors;
2197 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2198 vlib_frame_t * from_frame)
2200 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2204 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2205 vlib_frame_t * from_frame)
2207 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2211 VLIB_REGISTER_NODE (tcp4_output_node) =
2213 .function = tcp4_output,
2214 .name = "tcp4-output",
2215 /* Takes a vector of packets. */
2216 .vector_size = sizeof (u32),
2217 .n_errors = TCP_N_ERROR,
2218 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2219 .error_strings = tcp_error_strings,
2220 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2222 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2223 foreach_tcp4_output_next
2226 .format_buffer = format_tcp_header,
2227 .format_trace = format_tcp_tx_trace,
2231 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2234 VLIB_REGISTER_NODE (tcp6_output_node) =
2236 .function = tcp6_output,
2237 .name = "tcp6-output",
2238 /* Takes a vector of packets. */
2239 .vector_size = sizeof (u32),
2240 .n_errors = TCP_N_ERROR,
2241 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2242 .error_strings = tcp_error_strings,
2243 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2245 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2246 foreach_tcp6_output_next
2249 .format_buffer = format_tcp_header,
2250 .format_trace = format_tcp_tx_trace,
2254 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2256 typedef enum _tcp_reset_next
2258 TCP_RESET_NEXT_DROP,
2259 TCP_RESET_NEXT_IP_LOOKUP,
2263 #define foreach_tcp4_reset_next \
2264 _(DROP, "error-drop") \
2265 _(IP_LOOKUP, "ip4-lookup")
2267 #define foreach_tcp6_reset_next \
2268 _(DROP, "error-drop") \
2269 _(IP_LOOKUP, "ip6-lookup")
2272 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2273 vlib_frame_t * from_frame, u8 is_ip4)
2275 u32 n_left_from, next_index, *from, *to_next;
2276 u32 my_thread_index = vm->thread_index;
2278 from = vlib_frame_vector_args (from_frame);
2279 n_left_from = from_frame->n_vectors;
2281 next_index = node->cached_next_index;
2283 while (n_left_from > 0)
2287 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2289 while (n_left_from > 0 && n_left_to_next > 0)
2295 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2302 n_left_to_next -= 1;
2304 b0 = vlib_get_buffer (vm, bi0);
2306 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2307 my_thread_index, is_ip4))
2309 error0 = TCP_ERROR_LOOKUP_DROPS;
2310 next0 = TCP_RESET_NEXT_DROP;
2314 /* Prepare to send to IP lookup */
2315 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2316 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2319 b0->error = node->errors[error0];
2320 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2321 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2323 th0 = vlib_buffer_get_current (b0);
2325 th0 = ip4_next_header ((ip4_header_t *) th0);
2327 th0 = ip6_next_header ((ip6_header_t *) th0);
2328 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2329 clib_memcpy_fast (&t0->tcp_header, th0,
2330 sizeof (t0->tcp_header));
2333 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2334 n_left_to_next, bi0, next0);
2336 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2338 return from_frame->n_vectors;
2342 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2343 vlib_frame_t * from_frame)
2345 return tcp46_send_reset_inline (vm, node, from_frame, 1);
2349 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2350 vlib_frame_t * from_frame)
2352 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2356 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2357 .function = tcp4_send_reset,
2358 .name = "tcp4-reset",
2359 .vector_size = sizeof (u32),
2360 .n_errors = TCP_N_ERROR,
2361 .error_strings = tcp_error_strings,
2362 .n_next_nodes = TCP_RESET_N_NEXT,
2364 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2365 foreach_tcp4_reset_next
2368 .format_trace = format_tcp_tx_trace,
2372 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2375 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2376 .function = tcp6_send_reset,
2377 .name = "tcp6-reset",
2378 .vector_size = sizeof (u32),
2379 .n_errors = TCP_N_ERROR,
2380 .error_strings = tcp_error_strings,
2381 .n_next_nodes = TCP_RESET_N_NEXT,
2383 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2384 foreach_tcp6_reset_next
2387 .format_trace = format_tcp_tx_trace,
2391 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2394 * fd.io coding-style-patch-verification: ON
2397 * eval: (c-set-style "gnu")