2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/tcp/tcp.h>
17 #include <vnet/lisp-cp/packets.h>
20 vlib_node_registration_t tcp4_output_node;
21 vlib_node_registration_t tcp6_output_node;
23 typedef enum _tcp_output_next
26 TCP_OUTPUT_NEXT_IP_LOOKUP,
27 TCP_OUTPUT_NEXT_IP_REWRITE,
28 TCP_OUTPUT_NEXT_IP_ARP,
32 #define foreach_tcp4_output_next \
33 _ (DROP, "error-drop") \
34 _ (IP_LOOKUP, "ip4-lookup") \
35 _ (IP_REWRITE, "ip4-rewrite") \
38 #define foreach_tcp6_output_next \
39 _ (DROP, "error-drop") \
40 _ (IP_LOOKUP, "ip6-lookup") \
41 _ (IP_REWRITE, "ip6-rewrite") \
42 _ (IP_ARP, "ip6-discover-neighbor")
44 static char *tcp_error_strings[] = {
45 #define tcp_error(n,s) s,
46 #include <vnet/tcp/tcp_error.def>
52 tcp_header_t tcp_header;
53 tcp_connection_t tcp_connection;
59 format_tcp_tx_trace (u8 * s, va_list * args)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
63 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
64 u32 indent = format_get_indent (s);
66 s = format (s, "%U\n%U%U",
67 format_tcp_header, &t->tcp_header, 128,
68 format_white_space, indent,
69 format_tcp_connection, &t->tcp_connection, 1);
75 tcp_window_compute_scale (u32 window)
78 while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
84 * Update max segment size we're able to process.
86 * The value is constrained by our interface's MTU and IP options. It is
87 * also what we advertise to our peer.
90 tcp_update_rcv_mss (tcp_connection_t * tc)
92 /* TODO find our iface MTU */
93 tc->mss = dummy_mtu - sizeof (tcp_header_t);
97 * TCP's initial window
100 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
102 /* RFC 6928 recommends the value lower. However at the time our connections
103 * are initialized, fifos may not be allocated. Therefore, advertise the
104 * smallest possible unscaled window size and update once fifos are
105 * assigned to the session.
108 tcp_update_rcv_mss (tc);
109 TCP_IW_N_SEGMENTS * tc->mss;
111 return TCP_MIN_RX_FIFO_SIZE;
115 * Compute initial window and scale factor. As per RFC1323, window field in
116 * SYN and SYN-ACK segments is never scaled.
119 tcp_initial_window_to_advertise (tcp_connection_t * tc)
121 tcp_main_t *tm = &tcp_main;
124 /* Initial wnd for SYN. Fifos are not allocated yet.
125 * Use some predefined value. For SYN-ACK we still want the
126 * scale to be computed in the same way */
127 max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
129 /* Compute rcv wscale only if peer advertised support for it */
130 if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
131 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
133 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
135 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
139 tcp_update_rcv_wnd (tcp_connection_t * tc)
142 u32 available_space, max_fifo, wnd;
145 * Figure out how much space we have available
147 available_space = transport_max_rx_enqueue (&tc->connection);
148 max_fifo = transport_rx_fifo_size (&tc->connection);
150 ASSERT (tc->rcv_opts.mss < max_fifo);
151 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
155 * Use the above and what we know about what we've previously advertised
156 * to compute the new window
158 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
159 if (observed_wnd < 0)
162 /* Bad. Thou shalt not shrink */
163 if (available_space < observed_wnd)
166 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
170 wnd = available_space;
173 /* Make sure we have a multiple of rcv_wscale */
174 if (wnd && tc->rcv_wscale)
176 wnd &= ~(1 << tc->rcv_wscale);
178 wnd = 1 << tc->rcv_wscale;
181 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
185 * Compute and return window to advertise, scaled as per RFC1323
188 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
190 if (state < TCP_STATE_ESTABLISHED)
191 return tcp_initial_window_to_advertise (tc);
193 tcp_update_rcv_wnd (tc);
195 if (tc->rcv_wnd == 0)
197 tc->flags |= TCP_CONN_SENT_RCV_WND0;
201 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
204 return tc->rcv_wnd >> tc->rcv_wscale;
208 * Write TCP options to segment.
211 tcp_options_write (u8 * data, tcp_options_t * opts)
214 u32 buf, seq_len = 4;
216 if (tcp_opts_mss (opts))
218 *data++ = TCP_OPTION_MSS;
219 *data++ = TCP_OPTION_LEN_MSS;
220 buf = clib_host_to_net_u16 (opts->mss);
221 clib_memcpy_fast (data, &buf, sizeof (opts->mss));
222 data += sizeof (opts->mss);
223 opts_len += TCP_OPTION_LEN_MSS;
226 if (tcp_opts_wscale (opts))
228 *data++ = TCP_OPTION_WINDOW_SCALE;
229 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
230 *data++ = opts->wscale;
231 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
234 if (tcp_opts_sack_permitted (opts))
236 *data++ = TCP_OPTION_SACK_PERMITTED;
237 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
238 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
241 if (tcp_opts_tstamp (opts))
243 *data++ = TCP_OPTION_TIMESTAMP;
244 *data++ = TCP_OPTION_LEN_TIMESTAMP;
245 buf = clib_host_to_net_u32 (opts->tsval);
246 clib_memcpy_fast (data, &buf, sizeof (opts->tsval));
247 data += sizeof (opts->tsval);
248 buf = clib_host_to_net_u32 (opts->tsecr);
249 clib_memcpy_fast (data, &buf, sizeof (opts->tsecr));
250 data += sizeof (opts->tsecr);
251 opts_len += TCP_OPTION_LEN_TIMESTAMP;
254 if (tcp_opts_sack (opts))
257 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
258 TCP_OPTS_MAX_SACK_BLOCKS);
260 if (n_sack_blocks != 0)
262 *data++ = TCP_OPTION_SACK_BLOCK;
263 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
264 for (i = 0; i < n_sack_blocks; i++)
266 buf = clib_host_to_net_u32 (opts->sacks[i].start);
267 clib_memcpy_fast (data, &buf, seq_len);
269 buf = clib_host_to_net_u32 (opts->sacks[i].end);
270 clib_memcpy_fast (data, &buf, seq_len);
273 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
277 /* Terminate TCP options */
280 *data++ = TCP_OPTION_EOL;
281 opts_len += TCP_OPTION_LEN_EOL;
284 /* Pad with zeroes to a u32 boundary */
287 *data++ = TCP_OPTION_NOOP;
288 opts_len += TCP_OPTION_LEN_NOOP;
294 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
298 opts->flags |= TCP_OPTS_FLAG_MSS;
299 opts->mss = dummy_mtu; /*XXX discover that */
300 len += TCP_OPTION_LEN_MSS;
302 opts->flags |= TCP_OPTS_FLAG_WSCALE;
303 opts->wscale = wnd_scale;
304 len += TCP_OPTION_LEN_WINDOW_SCALE;
306 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
307 opts->tsval = tcp_time_now ();
309 len += TCP_OPTION_LEN_TIMESTAMP;
313 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
314 len += TCP_OPTION_LEN_SACK_PERMITTED;
317 /* Align to needed boundary */
318 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
323 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
327 opts->flags |= TCP_OPTS_FLAG_MSS;
329 len += TCP_OPTION_LEN_MSS;
331 if (tcp_opts_wscale (&tc->rcv_opts))
333 opts->flags |= TCP_OPTS_FLAG_WSCALE;
334 opts->wscale = tc->rcv_wscale;
335 len += TCP_OPTION_LEN_WINDOW_SCALE;
338 if (tcp_opts_tstamp (&tc->rcv_opts))
340 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
341 opts->tsval = tcp_time_now ();
342 opts->tsecr = tc->tsval_recent;
343 len += TCP_OPTION_LEN_TIMESTAMP;
346 if (tcp_opts_sack_permitted (&tc->rcv_opts))
348 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
349 len += TCP_OPTION_LEN_SACK_PERMITTED;
352 /* Align to needed boundary */
353 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
358 tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts)
364 if (tcp_opts_tstamp (&tc->rcv_opts))
366 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
367 opts->tsval = tcp_time_now_w_thread (tc->c_thread_index);
368 opts->tsecr = tc->tsval_recent;
369 len += TCP_OPTION_LEN_TIMESTAMP;
371 if (tcp_opts_sack_permitted (&tc->rcv_opts))
373 if (vec_len (tc->snd_sacks))
375 opts->flags |= TCP_OPTS_FLAG_SACK;
376 opts->sacks = tc->snd_sacks;
377 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
378 TCP_OPTS_MAX_SACK_BLOCKS);
379 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
383 /* Align to needed boundary */
384 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
389 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
394 case TCP_STATE_ESTABLISHED:
395 case TCP_STATE_FIN_WAIT_1:
396 case TCP_STATE_CLOSED:
397 case TCP_STATE_CLOSE_WAIT:
398 return tcp_make_established_options (tc, opts);
399 case TCP_STATE_SYN_RCVD:
400 return tcp_make_synack_options (tc, opts);
401 case TCP_STATE_SYN_SENT:
402 return tcp_make_syn_options (opts, tc->rcv_wscale);
404 clib_warning ("State not handled! %d", state);
410 * Update burst send vars
412 * - Updates snd_mss to reflect the effective segment size that we can send
413 * by taking into account all TCP options, including SACKs.
414 * - Cache 'on the wire' options for reuse
415 * - Updates receive window which can be reused for a burst.
417 * This should *only* be called when doing bursts
420 tcp_update_burst_snd_vars (tcp_connection_t * tc)
422 tcp_main_t *tm = &tcp_main;
424 /* Compute options to be used for connection. These may be reused when
425 * sending data or to compute the effective mss (snd_mss) */
426 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts,
427 TCP_STATE_ESTABLISHED);
429 /* XXX check if MTU has been updated */
430 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
431 ASSERT (tc->snd_mss > 0);
433 tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts,
436 tcp_update_rcv_wnd (tc);
440 tcp_init_mss (tcp_connection_t * tc)
442 u16 default_min_mss = 536;
443 tcp_update_rcv_mss (tc);
445 /* TODO cache mss and consider PMTU discovery */
446 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
448 if (tc->snd_mss < 45)
450 /* Assume that at least the min default mss works */
451 tc->snd_mss = default_min_mss;
452 tc->rcv_opts.mss = default_min_mss;
455 /* We should have enough space for 40 bytes of options */
456 ASSERT (tc->snd_mss > 45);
458 /* If we use timestamp option, account for it */
459 if (tcp_opts_tstamp (&tc->rcv_opts))
460 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
464 tcp_alloc_tx_buffers (tcp_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted)
466 vlib_main_t *vm = vlib_get_main ();
469 ASSERT (wanted > *n_bufs);
470 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
471 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
474 _vec_len (wrk->tx_buffers) = *n_bufs;
479 tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx)
481 u16 n_bufs = vec_len (wrk->tx_buffers);
483 TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index);
485 if (PREDICT_FALSE (!n_bufs))
487 if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE))
493 *bidx = wrk->tx_buffers[--n_bufs];
494 _vec_len (wrk->tx_buffers) = n_bufs;
499 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
501 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
502 vlib_buffer_free_one (vm, b->next_buffer);
503 /* Zero all flags but free list index and trace flag */
504 b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
506 b->current_length = 0;
507 b->total_length_not_including_first_buffer = 0;
508 vnet_buffer (b)->tcp.flags = 0;
510 /* Leave enough space for headers */
511 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
515 tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
517 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
518 b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
519 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
520 b->total_length_not_including_first_buffer = 0;
522 vnet_buffer (b)->tcp.flags = 0;
523 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
524 /* Leave enough space for headers */
525 return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
532 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
535 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
536 u8 tcp_opts_len, tcp_hdr_opts_len;
540 wnd = tcp_window_to_advertise (tc, state);
542 /* Make and write options */
543 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
544 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
546 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
547 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
549 tcp_options_write ((u8 *) (th + 1), snd_opts);
550 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
554 * Convert buffer to ACK
557 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
559 vlib_main_t *vm = vlib_get_main ();
561 tcp_reuse_buffer (vm, b);
562 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
563 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
564 tc->rcv_las = tc->rcv_nxt;
568 * Convert buffer to FIN-ACK
571 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
573 vlib_main_t *vm = vlib_get_main ();
576 tcp_reuse_buffer (vm, b);
578 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
579 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
581 /* Reset flags, make sure ack is sent */
582 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
586 * Convert buffer to SYN
589 tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
591 u8 tcp_hdr_opts_len, tcp_opts_len;
594 tcp_options_t snd_opts;
596 initial_wnd = tcp_initial_window_to_advertise (tc);
598 /* Make and write options */
599 clib_memset (&snd_opts, 0, sizeof (snd_opts));
600 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
601 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
603 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
604 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
606 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
607 tcp_options_write ((u8 *) (th + 1), &snd_opts);
611 * Convert buffer to SYN-ACK
614 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
616 vlib_main_t *vm = vlib_get_main ();
617 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
618 u8 tcp_opts_len, tcp_hdr_opts_len;
622 clib_memset (snd_opts, 0, sizeof (*snd_opts));
623 tcp_reuse_buffer (vm, b);
625 initial_wnd = tcp_initial_window_to_advertise (tc);
626 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
627 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
629 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
630 tc->rcv_nxt, tcp_hdr_opts_len,
631 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
632 tcp_options_write ((u8 *) (th + 1), snd_opts);
634 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
636 /* Init retransmit timer. Use update instead of set because of
638 tcp_retransmit_timer_force_update (tc);
639 TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
643 tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
644 u8 is_ip4, u32 fib_index, u8 flush)
646 vlib_main_t *vm = wrk->vm;
647 u32 *to_next, next_index;
650 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
653 vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index;
654 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
656 /* Send to IP lookup */
657 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
658 tcp_trajectory_add_start (b, 1);
660 f = wrk->ip_lookup_tx_frames[!is_ip4];
663 f = vlib_get_frame_to_node (vm, next_index);
665 wrk->ip_lookup_tx_frames[!is_ip4] = f;
668 to_next = vlib_frame_vector_args (f);
669 to_next[f->n_vectors] = bi;
671 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
673 vlib_put_frame_to_node (vm, next_index, f);
674 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
679 tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b,
680 u32 bi, u8 is_ip4, u32 fib_index)
682 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1);
686 tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
687 u8 is_ip4, u32 fib_index)
689 tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0);
690 if (wrk->vm->thread_index == 0 && vlib_num_workers ())
691 session_flush_frames_main_thread (wrk->vm);
695 tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
698 u32 *to_next, next_index;
701 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
704 /* Decide where to send the packet */
705 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
706 tcp_trajectory_add_start (b, 2);
708 /* Get frame to v4/6 output node */
709 f = wrk->tx_frames[!is_ip4];
712 f = vlib_get_frame_to_node (wrk->vm, next_index);
714 wrk->tx_frames[!is_ip4] = f;
716 to_next = vlib_frame_vector_args (f);
717 to_next[f->n_vectors] = bi;
719 if (flush || f->n_vectors == VLIB_FRAME_SIZE)
721 vlib_put_frame_to_node (wrk->vm, next_index, f);
722 wrk->tx_frames[!is_ip4] = 0;
727 tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
730 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
734 tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
737 tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
741 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
742 tcp_state_t state, u8 thread_index, u8 is_ip4)
747 ip4_address_t src_ip40, dst_ip40;
748 ip6_address_t src_ip60, dst_ip60;
749 u16 src_port, dst_port;
754 /* Find IP and TCP headers */
755 th0 = tcp_buffer_hdr (b0);
757 /* Save src and dst ip */
760 ih4 = vlib_buffer_get_current (b0);
761 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
762 src_ip40.as_u32 = ih4->src_address.as_u32;
763 dst_ip40.as_u32 = ih4->dst_address.as_u32;
767 ih6 = vlib_buffer_get_current (b0);
768 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
769 clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
770 clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
773 src_port = th0->src_port;
774 dst_port = th0->dst_port;
776 /* Try to determine what/why we're actually resetting */
777 if (state == TCP_STATE_CLOSED)
782 tmp = clib_net_to_host_u32 (th0->seq_number);
784 /* Got a SYN for no listener. */
785 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
786 ack = clib_host_to_net_u32 (tmp + 1);
791 flags = TCP_FLAG_RST;
792 seq = th0->ack_number;
796 tcp_reuse_buffer (vm, b0);
797 tcp_trajectory_add_start (b0, 4);
798 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
799 sizeof (tcp_header_t), flags, 0);
803 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
805 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
810 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
812 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
820 * Send reset without reusing existing buffer
822 * It extracts connection info out of original packet
825 tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
827 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
828 vlib_main_t *vm = wrk->vm;
830 u32 bi, sw_if_index, fib_index;
831 u8 tcp_hdr_len, flags = 0;
832 tcp_header_t *th, *pkt_th;
834 ip4_header_t *ih4, *pkt_ih4;
835 ip6_header_t *ih6, *pkt_ih6;
836 fib_protocol_t fib_proto;
838 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
841 b = vlib_get_buffer (vm, bi);
842 sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX];
843 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
844 fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index);
845 tcp_init_buffer (vm, b);
847 /* Make and write options */
848 tcp_hdr_len = sizeof (tcp_header_t);
852 pkt_ih4 = vlib_buffer_get_current (pkt);
853 pkt_th = ip4_next_header (pkt_ih4);
857 pkt_ih6 = vlib_buffer_get_current (pkt);
858 pkt_th = ip6_next_header (pkt_ih6);
861 if (tcp_ack (pkt_th))
863 flags = TCP_FLAG_RST;
864 seq = pkt_th->ack_number;
865 ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
869 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
871 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
874 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
875 seq, ack, tcp_hdr_len, flags, 0);
877 /* Swap src and dst ip */
880 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
881 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
882 &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
883 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
888 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
890 ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
891 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
892 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
896 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
897 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
901 * Build and set reset packet for connection
904 tcp_send_reset (tcp_connection_t * tc)
906 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
907 vlib_main_t *vm = wrk->vm;
911 u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
914 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
916 b = vlib_get_buffer (vm, bi);
917 tcp_init_buffer (vm, b);
919 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
920 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
921 advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
922 flags = TCP_FLAG_RST;
923 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
924 tc->rcv_nxt, tcp_hdr_opts_len, flags,
926 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
927 ASSERT (opts_write_len == tc->snd_opts_len);
928 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
932 ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
933 &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
934 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
940 ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
941 &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
942 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
945 tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
946 TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
950 tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
953 tcp_header_t *th = vlib_buffer_get_current (b);
954 vlib_main_t *vm = wrk->vm;
958 ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
959 &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
960 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
967 ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
968 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
969 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
977 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
978 * The packet is not forwarded through tcpx_output to avoid doing lookups
979 * in the half_open pool.
982 tcp_send_syn (tcp_connection_t * tc)
984 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
985 vlib_main_t *vm = wrk->vm;
990 * Setup retransmit and establish timers before requesting buffer
991 * such that we can return if we've ran out.
993 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
994 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
995 tc->rto * TCP_TO_TIMER_TICK);
997 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1000 b = vlib_get_buffer (vm, bi);
1001 tcp_init_buffer (vm, b);
1002 tcp_make_syn (tc, b);
1004 /* Measure RTT with this */
1005 tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
1006 tc->rtt_seq = tc->snd_nxt;
1009 tcp_push_ip_hdr (wrk, tc, b);
1010 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1011 TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
1015 tcp_send_synack (tcp_connection_t * tc)
1017 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1018 vlib_main_t *vm = wrk->vm;
1023 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1026 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1027 b = vlib_get_buffer (vm, bi);
1028 tcp_make_synack (tc, b);
1029 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1033 * Flush tx frame populated by retransmits and timer pops
1036 tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
1038 if (wrk->tx_frames[!is_ip4])
1041 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
1042 vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
1043 wrk->tx_frames[!is_ip4] = 0;
1048 * Flush ip lookup tx frames populated by timer pops
1051 tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
1053 if (wrk->ip_lookup_tx_frames[!is_ip4])
1056 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
1057 vlib_put_frame_to_node (wrk->vm, next_index,
1058 wrk->ip_lookup_tx_frames[!is_ip4]);
1059 wrk->ip_lookup_tx_frames[!is_ip4] = 0;
1064 * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
1067 tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
1069 tcp_flush_frame_to_output (wrk, 1);
1070 tcp_flush_frame_to_output (wrk, 0);
1071 tcp_flush_frame_to_ip_lookup (wrk, 1);
1072 tcp_flush_frame_to_ip_lookup (wrk, 0);
1079 tcp_send_fin (tcp_connection_t * tc)
1081 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1082 vlib_main_t *vm = wrk->vm;
1087 fin_snt = tc->flags & TCP_CONN_FINSNT;
1089 tc->snd_nxt = tc->snd_una;
1091 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1093 /* Out of buffers so program fin retransmit ASAP */
1094 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
1098 tcp_retransmit_timer_force_update (tc);
1099 b = vlib_get_buffer (vm, bi);
1100 tcp_init_buffer (vm, b);
1101 tcp_make_fin (tc, b);
1102 tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
1103 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
1108 tc->flags |= TCP_CONN_FINSNT;
1109 tc->flags &= ~TCP_CONN_FINPNDG;
1110 /* Account for the FIN */
1111 tc->snd_una_max += 1;
1112 tc->snd_nxt = tc->snd_una_max;
1116 tc->snd_nxt = tc->snd_una_max;
1121 tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
1125 case TCP_STATE_ESTABLISHED:
1126 case TCP_STATE_CLOSE_WAIT:
1127 return TCP_FLAG_ACK;
1128 case TCP_STATE_SYN_RCVD:
1129 return TCP_FLAG_SYN | TCP_FLAG_ACK;
1130 case TCP_STATE_SYN_SENT:
1131 return TCP_FLAG_SYN;
1132 case TCP_STATE_LAST_ACK:
1133 case TCP_STATE_FIN_WAIT_1:
1134 if (tc->snd_nxt + 1 < tc->snd_una_max)
1135 return TCP_FLAG_ACK;
1137 return TCP_FLAG_FIN;
1139 clib_warning ("Shouldn't be here!");
1145 * Push TCP header and update connection variables
1148 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
1149 tcp_state_t next_state, u8 compute_opts, u8 maybe_burst)
1151 u32 advertise_wnd, data_len;
1152 u8 tcp_hdr_opts_len, flags;
1153 tcp_main_t *tm = &tcp_main;
1156 data_len = b->current_length;
1157 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
1158 data_len += b->total_length_not_including_first_buffer;
1160 vnet_buffer (b)->tcp.flags = 0;
1161 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
1164 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1166 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
1169 advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
1171 advertise_wnd = tcp_window_to_advertise (tc, next_state);
1173 flags = tcp_make_state_flags (tc, next_state);
1174 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
1176 if (seq_geq (tc->psh_seq, tc->snd_nxt)
1177 && seq_lt (tc->psh_seq, tc->snd_nxt + data_len))
1178 flags |= TCP_FLAG_PSH;
1180 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
1181 tc->rcv_nxt, tcp_hdr_opts_len, flags,
1186 clib_memcpy_fast ((u8 *) (th + 1),
1187 tm->wrk_ctx[tc->c_thread_index].cached_opts,
1192 u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
1193 ASSERT (len == tc->snd_opts_len);
1197 * Update connection variables
1200 tc->snd_nxt += data_len;
1201 tc->rcv_las = tc->rcv_nxt;
1203 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
1207 tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b)
1209 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0,
1211 tc->snd_una_max = tc->snd_nxt;
1212 ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
1213 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1214 /* If not tracking an ACK, start tracking */
1215 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1217 tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
1218 tc->rtt_seq = tc->snd_nxt;
1220 if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)))
1222 tcp_retransmit_timer_set (tc);
1225 tcp_trajectory_add_start (b, 3);
1230 tcp_send_ack (tcp_connection_t * tc)
1232 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1233 vlib_main_t *vm = wrk->vm;
1238 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1240 b = vlib_get_buffer (vm, bi);
1241 tcp_init_buffer (vm, b);
1243 /* Fill in the ACK */
1244 tcp_make_ack (tc, b);
1245 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1249 tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1251 if (!(tc->flags & TCP_CONN_SNDACK))
1253 vec_add1 (wrk->pending_acks, tc->c_c_index);
1254 tc->flags |= TCP_CONN_SNDACK;
1259 tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1261 if (!(tc->flags & TCP_CONN_SNDACK))
1263 vec_add1 (wrk->pending_acks, tc->c_c_index);
1264 tc->flags |= TCP_CONN_SNDACK;
1266 if (tc->pending_dupacks < 255)
1267 tc->pending_dupacks += 1;
1271 tcp_send_acks (tcp_worker_ctx_t * wrk)
1273 u32 thread_index, *pending_acks;
1274 tcp_connection_t *tc;
1277 if (!vec_len (wrk->pending_acks))
1280 thread_index = wrk->vm->thread_index;
1281 pending_acks = wrk->pending_acks;
1282 for (i = 0; i < vec_len (pending_acks); i++)
1284 tc = tcp_connection_get (pending_acks[i], thread_index);
1285 tc->flags &= ~TCP_CONN_SNDACK;
1286 n_acks = clib_max (1, tc->pending_dupacks);
1287 /* If we're supposed to send dupacks but have no ooo data
1288 * send only one ack */
1289 if (tc->pending_dupacks && !vec_len (tc->snd_sacks))
1291 for (j = 0; j < n_acks; j++)
1293 tc->pending_dupacks = 0;
1295 _vec_len (wrk->pending_acks) = 0;
1299 * Delayed ack timer handler
1301 * Sends delayed ACK when timer expires
1304 tcp_timer_delack_handler (u32 index)
1306 u32 thread_index = vlib_get_thread_index ();
1307 tcp_connection_t *tc;
1309 tc = tcp_connection_get (index, thread_index);
1310 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
1315 * Allocate a new buffer and build a new tcp segment
1317 * @param wrk tcp worker
1318 * @param tc connection for which the segment will be allocated
1319 * @param offset offset of the first byte in the tx fifo
1320 * @param max_deq_byte segment size
1321 * @param[out] b pointer to buffer allocated
1323 * @return the number of bytes in the segment or 0 if buffer cannot be
1324 * allocated or no data available
1327 tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1328 u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b)
1330 u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer;
1332 vlib_main_t *vm = wrk->vm;
1336 seg_size = max_deq_bytes + MAX_HDRS_LEN;
1341 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1344 * Allocate and fill in buffer(s)
1347 /* Easy case, buffer size greater than mss */
1348 if (PREDICT_TRUE (seg_size <= bytes_per_buffer))
1350 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1352 *b = vlib_get_buffer (vm, bi);
1353 data = tcp_init_buffer (vm, *b);
1354 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1356 ASSERT (n_bytes == max_deq_bytes);
1357 b[0]->current_length = n_bytes;
1358 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1359 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1360 tc->snd_una_max = tc->snd_nxt;
1362 /* Split mss into multiple buffers */
1365 u32 chain_bi = ~0, n_bufs_per_seg;
1366 u16 n_peeked, len_to_deq, available_bufs;
1367 vlib_buffer_t *chain_b, *prev_b;
1370 /* Make sure we have enough buffers */
1371 n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer);
1372 available_bufs = vec_len (wrk->tx_buffers);
1373 if (n_bufs_per_seg > available_bufs)
1375 tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE);
1376 if (n_bufs_per_seg > available_bufs)
1383 (void) tcp_get_free_buffer_index (wrk, &bi);
1384 ASSERT (bi != (u32) ~ 0);
1385 *b = vlib_get_buffer (vm, bi);
1386 data = tcp_init_buffer (vm, *b);
1387 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1388 bytes_per_buffer - MAX_HDRS_LEN);
1389 b[0]->current_length = n_bytes;
1390 b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1391 b[0]->total_length_not_including_first_buffer = 0;
1392 max_deq_bytes -= n_bytes;
1395 for (i = 1; i < n_bufs_per_seg; i++)
1398 len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer);
1399 tcp_get_free_buffer_index (wrk, &chain_bi);
1400 ASSERT (chain_bi != (u32) ~ 0);
1401 chain_b = vlib_get_buffer (vm, chain_bi);
1402 chain_b->current_data = 0;
1403 data = vlib_buffer_get_current (chain_b);
1404 n_peeked = stream_session_peek_bytes (&tc->connection, data,
1405 offset + n_bytes, len_to_deq);
1406 ASSERT (n_peeked == len_to_deq);
1407 n_bytes += n_peeked;
1408 chain_b->current_length = n_peeked;
1409 chain_b->next_buffer = 0;
1411 /* update previous buffer */
1412 prev_b->next_buffer = chain_bi;
1413 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1415 max_deq_bytes -= n_peeked;
1416 b[0]->total_length_not_including_first_buffer += n_peeked;
1419 tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0);
1420 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
1421 tc->snd_una_max = tc->snd_nxt;
1424 ASSERT (n_bytes > 0);
1425 ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer);
1431 * Build a retransmit segment
1433 * @return the number of bytes in the segment or 0 if there's nothing to
1437 tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk,
1438 tcp_connection_t * tc, u32 offset,
1439 u32 max_deq_bytes, vlib_buffer_t ** b)
1441 u32 start, available_bytes;
1444 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
1445 ASSERT (max_deq_bytes != 0);
1448 * Make sure we can retransmit something
1450 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1451 ASSERT (available_bytes >= offset);
1452 available_bytes -= offset;
1453 if (!available_bytes)
1456 max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
1457 max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
1459 /* Start is beyond snd_congestion */
1460 start = tc->snd_una + offset;
1461 if (seq_geq (start, tc->snd_congestion))
1464 /* Don't overshoot snd_congestion */
1465 if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
1467 max_deq_bytes = tc->snd_congestion - start;
1468 if (max_deq_bytes == 0)
1472 n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
1476 if (tcp_in_fastrecovery (tc))
1477 tc->snd_rxt_bytes += n_bytes;
1480 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1485 * Reset congestion control, switch cwnd to loss window and try again.
1488 tcp_rxt_timeout_cc (tcp_connection_t * tc)
1490 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
1491 tc->prev_ssthresh = tc->ssthresh;
1492 tc->prev_cwnd = tc->cwnd;
1494 /* Cleanly recover cc (also clears up fast retransmit) */
1495 if (tcp_in_fastrecovery (tc))
1497 /* TODO be less aggressive about this */
1498 scoreboard_clear (&tc->sack_sb);
1499 tcp_cc_fastrecovery_exit (tc);
1502 /* Start again from the beginning */
1503 tc->cc_algo->congestion (tc);
1504 tc->cwnd = tcp_loss_wnd (tc);
1505 tc->snd_congestion = tc->snd_una_max;
1507 tc->cwnd_acc_bytes = 0;
1508 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
1509 tcp_recovery_on (tc);
1513 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1515 u32 thread_index = vlib_get_thread_index ();
1516 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1517 vlib_main_t *vm = wrk->vm;
1518 tcp_connection_t *tc;
1519 vlib_buffer_t *b = 0;
1524 tc = tcp_half_open_connection_get (index);
1525 /* Note: the connection may have transitioned to ESTABLISHED... */
1526 if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
1528 tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1532 tc = tcp_connection_get (index, thread_index);
1533 /* Note: the connection may have been closed and pool_put */
1534 if (PREDICT_FALSE (tc == 0 || tc->state < TCP_STATE_SYN_RCVD))
1536 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1539 if (tc->state >= TCP_STATE_ESTABLISHED)
1541 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1543 /* Lost FIN, retransmit and return */
1544 if (tcp_is_lost_fin (tc))
1548 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1552 /* Shouldn't be here. This condition is tricky because it has to take
1553 * into account boff > 0 due to persist timeout. */
1554 if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max)
1555 || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion)
1556 && !tcp_flight_size (tc)))
1558 ASSERT (!tcp_in_recovery (tc));
1563 /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due
1564 * to persist timer timeout */
1565 if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
1568 tcp_update_rto (tc);
1571 /* Increment RTO backoff (also equal to number of retries) and go back
1572 * to first un-acked byte */
1575 /* First retransmit timeout */
1576 if (tc->rto_boff == 1)
1577 tcp_rxt_timeout_cc (tc);
1579 scoreboard_clear (&tc->sack_sb);
1581 /* If we've sent beyond snd_congestion, update it */
1582 if (seq_gt (tc->snd_una_max, tc->snd_congestion))
1583 tc->snd_congestion = tc->snd_una_max;
1585 tc->snd_una_max = tc->snd_nxt = tc->snd_una;
1586 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1588 /* Send one segment. Note that n_bytes may be zero due to buffer
1590 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1594 tcp_retransmit_timer_force_update (tc);
1598 bi = vlib_get_buffer_index (vm, b);
1600 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1601 if (tc->rto_boff == 1)
1602 tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index);
1604 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1605 tcp_retransmit_timer_force_update (tc);
1607 /* Retransmit for SYN */
1608 else if (tc->state == TCP_STATE_SYN_SENT)
1610 /* Half-open connection actually moved to established but we were
1611 * waiting for syn retransmit to pop to call cleanup from the right
1613 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
1615 if (tcp_half_open_connection_cleanup (tc))
1617 clib_warning ("could not remove half-open connection");
1623 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1625 /* Try without increasing RTO a number of times. If this fails,
1626 * start growing RTO exponentially */
1628 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1629 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1631 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
1632 tc->rto * TCP_TO_TIMER_TICK);
1634 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1637 b = vlib_get_buffer (vm, bi);
1638 tcp_init_buffer (vm, b);
1639 tcp_make_syn (tc, b);
1642 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
1644 /* This goes straight to ipx_lookup. Retransmit timer set already */
1645 tcp_push_ip_hdr (wrk, tc, b);
1646 tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
1648 /* Retransmit SYN-ACK */
1649 else if (tc->state == TCP_STATE_SYN_RCVD)
1651 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1654 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1655 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1658 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1660 tcp_retransmit_timer_force_update (tc);
1664 b = vlib_get_buffer (vm, bi);
1665 tcp_init_buffer (vm, b);
1666 tcp_make_synack (tc, b);
1667 TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
1669 /* Retransmit timer already updated, just enqueue to output */
1670 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1674 ASSERT (tc->state == TCP_STATE_CLOSED);
1680 tcp_timer_retransmit_handler (u32 index)
1682 tcp_timer_retransmit_handler_i (index, 0);
1686 tcp_timer_retransmit_syn_handler (u32 index)
1688 tcp_timer_retransmit_handler_i (index, 1);
1692 * Got 0 snd_wnd from peer, try to do something about it.
1696 tcp_timer_persist_handler (u32 index)
1698 u32 thread_index = vlib_get_thread_index ();
1699 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1700 u32 bi, max_snd_bytes, available_bytes, offset;
1701 tcp_main_t *tm = vnet_get_tcp_main ();
1702 vlib_main_t *vm = wrk->vm;
1703 tcp_connection_t *tc;
1708 tc = tcp_connection_get_if_valid (index, thread_index);
1713 /* Make sure timer handle is set to invalid */
1714 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1716 /* Problem already solved or worse */
1717 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1718 || tc->snd_wnd > tc->snd_mss)
1721 available_bytes = session_tx_fifo_max_dequeue (&tc->connection);
1722 offset = tc->snd_una_max - tc->snd_una;
1724 /* Reprogram persist if no new bytes available to send. We may have data
1726 if (!available_bytes)
1728 tcp_persist_timer_set (tc);
1732 if (available_bytes <= offset)
1734 ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1738 /* Increment RTO backoff */
1740 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1743 * Try to force the first unsent segment (or buffer)
1745 if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
1747 tcp_persist_timer_set (tc);
1750 b = vlib_get_buffer (vm, bi);
1751 data = tcp_init_buffer (vm, b);
1753 tcp_validate_txf_size (tc, offset);
1754 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1755 max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
1756 n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
1758 b->current_length = n_bytes;
1759 ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
1760 || tc->snd_nxt == tc->snd_una_max
1761 || tc->rto_boff > 1));
1763 tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0);
1764 tc->snd_una_max = tc->snd_nxt;
1765 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1766 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1768 /* Just sent new data, enable retransmit */
1769 tcp_retransmit_timer_update (tc);
1773 * Retransmit first unacked segment
1776 tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1778 u32 bi, old_snd_nxt, n_bytes;
1779 vlib_main_t *vm = wrk->vm;
1782 old_snd_nxt = tc->snd_nxt;
1783 tc->snd_nxt = tc->snd_una;
1785 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1787 n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
1791 bi = vlib_get_buffer_index (vm, b);
1792 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1793 tc->snd_nxt = old_snd_nxt;
1799 tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1802 u32 offset, n_segs = 0, n_written, bi;
1803 vlib_main_t *vm = wrk->vm;
1804 vlib_buffer_t *b = 0;
1806 tc->snd_nxt = tc->snd_una_max;
1807 offset = tc->snd_una_max - tc->snd_una;
1808 while (n_segs < burst_size)
1810 n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
1814 bi = vlib_get_buffer_index (vm, b);
1815 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1816 offset += n_written;
1824 #define scoreboard_rescue_rxt_valid(_sb, _tc) \
1825 (seq_geq (_sb->rescue_rxt, _tc->snd_una) \
1826 && seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
1829 * Do fast retransmit with SACKs
1832 tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1835 u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
1836 sack_scoreboard_hole_t *hole;
1837 vlib_main_t *vm = wrk->vm;
1838 vlib_buffer_t *b = 0;
1839 sack_scoreboard_t *sb;
1840 u32 bi, old_snd_nxt;
1843 u8 snd_limited = 0, can_rescue = 0;
1845 ASSERT (tcp_in_fastrecovery (tc));
1847 snd_space = tcp_available_cc_snd_space (tc);
1848 if (snd_space < tc->snd_mss)
1850 tcp_program_fastretransmit (wrk, tc);
1854 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1855 old_snd_nxt = tc->snd_nxt;
1857 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1859 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1860 max_deq -= tc->snd_una_max - tc->snd_una;
1862 while (snd_space > 0 && n_segs < burst_size)
1864 hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
1870 snd_space = clib_min (max_deq, snd_space);
1871 burst_size = clib_min (burst_size - n_segs,
1872 snd_space / tc->snd_mss);
1873 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1874 if (max_deq > n_segs_now * tc->snd_mss)
1875 tcp_program_fastretransmit (wrk, tc);
1876 n_segs += n_segs_now;
1880 if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
1883 /* If rescue rxt undefined or less than snd_una then one segment of
1884 * up to SMSS octets that MUST include the highest outstanding
1885 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1886 * RecoveryPoint. HighRxt MUST NOT be updated.
1888 max_bytes = clib_min (tc->snd_mss,
1889 tc->snd_congestion - tc->snd_una);
1890 max_bytes = clib_min (max_bytes, snd_space);
1891 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1892 sb->rescue_rxt = tc->snd_congestion;
1893 tc->snd_nxt = tc->snd_una + offset;
1894 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1899 bi = vlib_get_buffer_index (vm, b);
1900 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1905 max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
1906 max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
1910 offset = sb->high_rxt - tc->snd_una;
1911 tc->snd_nxt = sb->high_rxt;
1912 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
1914 ASSERT (n_written <= snd_space);
1916 /* Nothing left to retransmit */
1920 bi = vlib_get_buffer_index (vm, b);
1921 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1923 sb->high_rxt += n_written;
1924 snd_space -= n_written;
1929 tcp_program_fastretransmit (wrk, tc);
1932 /* If window allows, send 1 SMSS of new data */
1933 tc->snd_nxt = old_snd_nxt;
1938 * Fast retransmit without SACK info
1941 tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1944 u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now;
1945 vlib_main_t *vm = wrk->vm;
1946 int snd_space, n_segs = 0;
1949 ASSERT (tcp_in_fastrecovery (tc));
1950 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1951 old_snd_nxt = tc->snd_nxt;
1953 if (!tcp_fastrecovery_first (tc))
1956 /* RFC 6582: [If a partial ack], retransmit the first unacknowledged
1958 snd_space = tc->sack_sb.last_bytes_delivered;
1959 tc->snd_nxt = tc->snd_una;
1960 while (snd_space > 0 && n_segs < burst_size)
1962 n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
1965 /* Nothing left to retransmit */
1969 bi = vlib_get_buffer_index (vm, b);
1970 tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
1971 snd_space -= n_written;
1972 offset += n_written;
1976 if (n_segs == burst_size)
1981 /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */
1982 snd_space = tcp_available_cc_snd_space (tc);
1983 if (snd_space < tc->snd_mss || tc->snd_mss == 0)
1986 max_deq = session_tx_fifo_max_dequeue (&tc->connection);
1987 max_deq -= tc->snd_una_max - tc->snd_una;
1990 snd_space = clib_min (max_deq, snd_space);
1991 burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
1992 n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
1993 if (max_deq > n_segs_now * tc->snd_mss)
1994 tcp_program_fastretransmit (wrk, tc);
1995 n_segs += n_segs_now;
1998 /* Restore snd_nxt */
1999 tc->snd_nxt = old_snd_nxt;
2002 tcp_fastrecovery_first_off (tc);
2007 * Do fast retransmit
2010 tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
2013 if (tcp_opts_sack_permitted (&tc->rcv_opts))
2014 return tcp_fast_retransmit_sack (wrk, tc, burst_size);
2016 return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
2020 tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
2021 u16 * next0, u32 * error0)
2023 ip_adjacency_t *adj;
2026 /* Not thread safe but as long as the connection exists the adj should
2028 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
2030 if (ai == ADJ_INDEX_INVALID)
2032 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2033 *next0 = TCP_OUTPUT_NEXT_DROP;
2034 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2039 if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
2040 *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
2041 else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
2042 *next0 = TCP_OUTPUT_NEXT_IP_ARP;
2045 *next0 = TCP_OUTPUT_NEXT_DROP;
2046 *error0 = TCP_ERROR_LINK_LOCAL_RW;
2048 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
2052 tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2053 u32 * to_next, u32 n_bufs)
2055 u32 n_trace = vlib_get_trace_count (vm, node);
2056 tcp_connection_t *tc;
2062 for (i = 0; i < clib_min (n_trace, n_bufs); i++)
2064 b = vlib_get_buffer (vm, to_next[i]);
2065 th = vlib_buffer_get_current (b);
2066 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2068 t = vlib_add_trace (vm, node, b, sizeof (*t));
2069 clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
2070 clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
2075 tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
2076 tcp_connection_t * tc0, u8 is_ip4)
2078 tcp_header_t *th0 = 0;
2080 th0 = vlib_buffer_get_current (b0);
2081 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
2084 vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
2085 IP_PROTOCOL_TCP, 1);
2086 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2087 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2093 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
2094 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
2095 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
2096 vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
2097 vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
2103 tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
2104 u32 * error0, u16 * next0, u8 is_ip4)
2107 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2109 *error0 = TCP_ERROR_INVALID_CONNECTION;
2110 *next0 = TCP_OUTPUT_NEXT_DROP;
2114 vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
2115 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
2119 if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
2120 tcp_output_handle_link_local (tc0, b0, next0, error0);
2123 if (!TCP_ALWAYS_ACK)
2124 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
2128 tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2129 vlib_frame_t * frame, int is_ip4)
2131 u32 n_left_from, *from, thread_index = vm->thread_index;
2132 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2133 u16 nexts[VLIB_FRAME_SIZE], *next;
2135 from = vlib_frame_vector_args (frame);
2136 n_left_from = frame->n_vectors;
2137 tcp_set_time_now (tcp_get_worker (thread_index));
2139 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2140 tcp46_output_trace_frame (vm, node, from, n_left_from);
2142 vlib_get_buffers (vm, from, bufs, n_left_from);
2146 while (n_left_from >= 4)
2148 u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
2149 tcp_connection_t *tc0, *tc1;
2152 vlib_prefetch_buffer_header (b[2], STORE);
2153 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2155 vlib_prefetch_buffer_header (b[3], STORE);
2156 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2159 next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2161 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2163 tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
2166 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2167 tcp_output_push_ip (vm, b[1], tc1, is_ip4);
2169 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2170 tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
2176 while (n_left_from > 0)
2178 u32 error0 = TCP_ERROR_PKTS_SENT;
2179 tcp_connection_t *tc0;
2181 if (n_left_from > 1)
2183 vlib_prefetch_buffer_header (b[1], STORE);
2184 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
2187 next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
2188 tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2191 tcp_output_push_ip (vm, b[0], tc0, is_ip4);
2192 tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
2199 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2200 return frame->n_vectors;
2204 tcp4_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, 1 /* is_ip4 */ );
2211 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
2212 vlib_frame_t * from_frame)
2214 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2218 VLIB_REGISTER_NODE (tcp4_output_node) =
2220 .function = tcp4_output,
2221 .name = "tcp4-output",
2222 /* Takes a vector of packets. */
2223 .vector_size = sizeof (u32),
2224 .n_errors = TCP_N_ERROR,
2225 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2226 .error_strings = tcp_error_strings,
2227 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2229 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2230 foreach_tcp4_output_next
2233 .format_buffer = format_tcp_header,
2234 .format_trace = format_tcp_tx_trace,
2238 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
2241 VLIB_REGISTER_NODE (tcp6_output_node) =
2243 .function = tcp6_output,
2244 .name = "tcp6-output",
2245 /* Takes a vector of packets. */
2246 .vector_size = sizeof (u32),
2247 .n_errors = TCP_N_ERROR,
2248 .protocol_hint = VLIB_NODE_PROTO_HINT_TCP,
2249 .error_strings = tcp_error_strings,
2250 .n_next_nodes = TCP_OUTPUT_N_NEXT,
2252 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
2253 foreach_tcp6_output_next
2256 .format_buffer = format_tcp_header,
2257 .format_trace = format_tcp_tx_trace,
2261 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
2263 typedef enum _tcp_reset_next
2265 TCP_RESET_NEXT_DROP,
2266 TCP_RESET_NEXT_IP_LOOKUP,
2270 #define foreach_tcp4_reset_next \
2271 _(DROP, "error-drop") \
2272 _(IP_LOOKUP, "ip4-lookup")
2274 #define foreach_tcp6_reset_next \
2275 _(DROP, "error-drop") \
2276 _(IP_LOOKUP, "ip6-lookup")
2279 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2280 vlib_frame_t * from_frame, u8 is_ip4)
2282 u32 n_left_from, next_index, *from, *to_next;
2283 u32 my_thread_index = vm->thread_index;
2285 from = vlib_frame_vector_args (from_frame);
2286 n_left_from = from_frame->n_vectors;
2288 next_index = node->cached_next_index;
2290 while (n_left_from > 0)
2294 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2296 while (n_left_from > 0 && n_left_to_next > 0)
2302 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
2309 n_left_to_next -= 1;
2311 b0 = vlib_get_buffer (vm, bi0);
2313 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
2314 my_thread_index, is_ip4))
2316 error0 = TCP_ERROR_LOOKUP_DROPS;
2317 next0 = TCP_RESET_NEXT_DROP;
2321 /* Prepare to send to IP lookup */
2322 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
2323 next0 = TCP_RESET_NEXT_IP_LOOKUP;
2326 b0->error = node->errors[error0];
2327 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
2328 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2330 th0 = vlib_buffer_get_current (b0);
2332 th0 = ip4_next_header ((ip4_header_t *) th0);
2334 th0 = ip6_next_header ((ip6_header_t *) th0);
2335 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2336 clib_memcpy_fast (&t0->tcp_header, th0,
2337 sizeof (t0->tcp_header));
2340 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2341 n_left_to_next, bi0, next0);
2343 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2345 return from_frame->n_vectors;
2349 tcp4_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, 1);
2356 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
2357 vlib_frame_t * from_frame)
2359 return tcp46_send_reset_inline (vm, node, from_frame, 0);
2363 VLIB_REGISTER_NODE (tcp4_reset_node) = {
2364 .function = tcp4_send_reset,
2365 .name = "tcp4-reset",
2366 .vector_size = sizeof (u32),
2367 .n_errors = TCP_N_ERROR,
2368 .error_strings = tcp_error_strings,
2369 .n_next_nodes = TCP_RESET_N_NEXT,
2371 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2372 foreach_tcp4_reset_next
2375 .format_trace = format_tcp_tx_trace,
2379 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
2382 VLIB_REGISTER_NODE (tcp6_reset_node) = {
2383 .function = tcp6_send_reset,
2384 .name = "tcp6-reset",
2385 .vector_size = sizeof (u32),
2386 .n_errors = TCP_N_ERROR,
2387 .error_strings = tcp_error_strings,
2388 .n_next_nodes = TCP_RESET_N_NEXT,
2390 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
2391 foreach_tcp6_reset_next
2394 .format_trace = format_tcp_tx_trace,
2398 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
2401 * fd.io coding-style-patch-verification: ON
2404 * eval: (c-set-style "gnu")