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>
19 vlib_node_registration_t tcp4_output_node;
20 vlib_node_registration_t tcp6_output_node;
22 typedef enum _tcp_output_nect
28 #define foreach_tcp4_output_next \
29 _ (DROP, "error-drop") \
31 #define foreach_tcp6_output_next \
32 _ (DROP, "error-drop") \
34 static char *tcp_error_strings[] = {
35 #define tcp_error(n,s) s,
36 #include <vnet/tcp/tcp_error.def>
42 tcp_header_t tcp_header;
43 tcp_connection_t tcp_connection;
49 format_tcp_tx_trace (u8 * s, va_list * args)
51 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
52 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
53 tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
54 uword indent = format_get_indent (s);
56 s = format (s, "%U\n%U%U",
57 format_tcp_header, &t->tcp_header, 128,
58 format_white_space, indent,
59 format_tcp_connection, &t->tcp_connection, 1);
65 tcp_window_compute_scale (u32 available_space)
68 while (wnd_scale < TCP_MAX_WND_SCALE
69 && (available_space >> wnd_scale) > TCP_WND_MAX)
75 * TCP's IW as recommended by RFC6928
78 tcp_initial_wnd_unscaled (tcp_connection_t * tc)
80 return TCP_IW_N_SEGMENTS * tc->mss;
84 * Compute initial window and scale factor. As per RFC1323, window field in
85 * SYN and SYN-ACK segments is never scaled.
88 tcp_initial_window_to_advertise (tcp_connection_t * tc)
92 /* Initial wnd for SYN. Fifos are not allocated yet.
93 * Use some predefined value. For SYN-ACK we still want the
94 * scale to be computed in the same way */
95 max_fifo = TCP_MAX_RX_FIFO_SIZE;
97 tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
98 tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
100 return clib_min (tc->rcv_wnd, TCP_WND_MAX);
104 * Compute and return window to advertise, scaled as per RFC1323
107 tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
109 if (state < TCP_STATE_ESTABLISHED)
110 return tcp_initial_window_to_advertise (tc);
112 tcp_update_rcv_wnd (tc);
114 if (tc->rcv_wnd == 0)
116 tc->flags |= TCP_CONN_SENT_RCV_WND0;
120 tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
123 return tc->rcv_wnd >> tc->rcv_wscale;
127 tcp_update_rcv_wnd (tcp_connection_t * tc)
130 u32 available_space, max_fifo, wnd;
133 * Figure out how much space we have available
135 available_space = stream_session_max_rx_enqueue (&tc->connection);
136 max_fifo = stream_session_rx_fifo_size (&tc->connection);
138 ASSERT (tc->rcv_opts.mss < max_fifo);
139 if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
143 * Use the above and what we know about what we've previously advertised
144 * to compute the new window
146 observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
147 if (observed_wnd < 0)
150 /* Bad. Thou shalt not shrink */
151 if (available_space < observed_wnd)
154 TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
158 wnd = available_space;
161 /* Make sure we have a multiple of rcv_wscale */
162 if (wnd && tc->rcv_wscale)
164 wnd &= ~(1 << tc->rcv_wscale);
166 wnd = 1 << tc->rcv_wscale;
169 tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
173 * Write TCP options to segment.
176 tcp_options_write (u8 * data, tcp_options_t * opts)
179 u32 buf, seq_len = 4;
181 if (tcp_opts_mss (opts))
183 *data++ = TCP_OPTION_MSS;
184 *data++ = TCP_OPTION_LEN_MSS;
185 buf = clib_host_to_net_u16 (opts->mss);
186 clib_memcpy (data, &buf, sizeof (opts->mss));
187 data += sizeof (opts->mss);
188 opts_len += TCP_OPTION_LEN_MSS;
191 if (tcp_opts_wscale (opts))
193 *data++ = TCP_OPTION_WINDOW_SCALE;
194 *data++ = TCP_OPTION_LEN_WINDOW_SCALE;
195 *data++ = opts->wscale;
196 opts_len += TCP_OPTION_LEN_WINDOW_SCALE;
199 if (tcp_opts_sack_permitted (opts))
201 *data++ = TCP_OPTION_SACK_PERMITTED;
202 *data++ = TCP_OPTION_LEN_SACK_PERMITTED;
203 opts_len += TCP_OPTION_LEN_SACK_PERMITTED;
206 if (tcp_opts_tstamp (opts))
208 *data++ = TCP_OPTION_TIMESTAMP;
209 *data++ = TCP_OPTION_LEN_TIMESTAMP;
210 buf = clib_host_to_net_u32 (opts->tsval);
211 clib_memcpy (data, &buf, sizeof (opts->tsval));
212 data += sizeof (opts->tsval);
213 buf = clib_host_to_net_u32 (opts->tsecr);
214 clib_memcpy (data, &buf, sizeof (opts->tsecr));
215 data += sizeof (opts->tsecr);
216 opts_len += TCP_OPTION_LEN_TIMESTAMP;
219 if (tcp_opts_sack (opts))
222 u32 n_sack_blocks = clib_min (vec_len (opts->sacks),
223 TCP_OPTS_MAX_SACK_BLOCKS);
225 if (n_sack_blocks != 0)
227 *data++ = TCP_OPTION_SACK_BLOCK;
228 *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
229 for (i = 0; i < n_sack_blocks; i++)
231 buf = clib_host_to_net_u32 (opts->sacks[i].start);
232 clib_memcpy (data, &buf, seq_len);
234 buf = clib_host_to_net_u32 (opts->sacks[i].end);
235 clib_memcpy (data, &buf, seq_len);
238 opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK;
242 /* Terminate TCP options */
245 *data++ = TCP_OPTION_EOL;
246 opts_len += TCP_OPTION_LEN_EOL;
249 /* Pad with zeroes to a u32 boundary */
252 *data++ = TCP_OPTION_NOOP;
253 opts_len += TCP_OPTION_LEN_NOOP;
259 tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
263 opts->flags |= TCP_OPTS_FLAG_MSS;
264 opts->mss = dummy_mtu; /*XXX discover that */
265 len += TCP_OPTION_LEN_MSS;
267 opts->flags |= TCP_OPTS_FLAG_WSCALE;
268 opts->wscale = wnd_scale;
269 len += TCP_OPTION_LEN_WINDOW_SCALE;
271 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
272 opts->tsval = tcp_time_now ();
274 len += TCP_OPTION_LEN_TIMESTAMP;
278 opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
279 len += TCP_OPTION_LEN_SACK_PERMITTED;
282 /* Align to needed boundary */
283 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
288 tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts)
292 opts->flags |= TCP_OPTS_FLAG_MSS;
294 len += TCP_OPTION_LEN_MSS;
296 if (tcp_opts_wscale (&tc->rcv_opts))
298 opts->flags |= TCP_OPTS_FLAG_WSCALE;
299 opts->wscale = tc->rcv_wscale;
300 len += TCP_OPTION_LEN_WINDOW_SCALE;
303 if (tcp_opts_tstamp (&tc->rcv_opts))
305 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
306 opts->tsval = tcp_time_now ();
307 opts->tsecr = tc->tsval_recent;
308 len += TCP_OPTION_LEN_TIMESTAMP;
311 if (tcp_opts_sack_permitted (&tc->rcv_opts))
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_established_options (tcp_connection_t * tc, tcp_options_t * opts)
329 if (tcp_opts_tstamp (&tc->rcv_opts))
331 opts->flags |= TCP_OPTS_FLAG_TSTAMP;
332 opts->tsval = tcp_time_now ();
333 opts->tsecr = tc->tsval_recent;
334 len += TCP_OPTION_LEN_TIMESTAMP;
336 if (tcp_opts_sack_permitted (&tc->rcv_opts))
338 if (vec_len (tc->snd_sacks))
340 opts->flags |= TCP_OPTS_FLAG_SACK;
341 opts->sacks = tc->snd_sacks;
342 opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks),
343 TCP_OPTS_MAX_SACK_BLOCKS);
344 len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks;
348 /* Align to needed boundary */
349 len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
354 tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts,
359 case TCP_STATE_ESTABLISHED:
360 case TCP_STATE_FIN_WAIT_1:
361 return tcp_make_established_options (tc, opts);
362 case TCP_STATE_SYN_RCVD:
363 return tcp_make_synack_options (tc, opts);
364 case TCP_STATE_SYN_SENT:
365 return tcp_make_syn_options (opts, tc->rcv_wscale);
367 clib_warning ("Not handled!");
373 * Update max segment size we're able to process.
375 * The value is constrained by our interface's MTU and IP options. It is
376 * also what we advertise to our peer.
379 tcp_update_rcv_mss (tcp_connection_t * tc)
381 /* TODO find our iface MTU */
386 * Update snd_mss to reflect the effective segment size that we can send
387 * by taking into account all TCP options, including SACKs
390 tcp_update_snd_mss (tcp_connection_t * tc)
392 /* Compute options to be used for connection. These may be reused when
393 * sending data or to compute the effective mss (snd_mss) */
395 tcp_make_options (tc, &tc->snd_opts, TCP_STATE_ESTABLISHED);
397 /* XXX check if MTU has been updated */
398 tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
399 ASSERT (tc->snd_mss > 0);
403 tcp_init_mss (tcp_connection_t * tc)
405 u16 default_min_mss = 536;
406 tcp_update_rcv_mss (tc);
408 /* TODO cache mss and consider PMTU discovery */
409 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
411 if (tc->snd_mss < 45)
413 clib_warning ("snd mss is 0");
414 /* Assume that at least the min default mss works */
415 tc->snd_mss = default_min_mss;
416 tc->rcv_opts.mss = default_min_mss;
419 /* We should have enough space for 40 bytes of options */
420 ASSERT (tc->snd_mss > 45);
422 /* If we use timestamp option, account for it */
423 if (tcp_opts_tstamp (&tc->rcv_opts))
424 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
427 #define tcp_get_free_buffer_index(tm, bidx) \
429 u32 *my_tx_buffers, n_free_buffers; \
430 u32 thread_index = vlib_get_thread_index(); \
431 my_tx_buffers = tm->tx_buffers[thread_index]; \
432 if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \
434 n_free_buffers = 32; /* TODO config or macro */ \
435 vec_validate (my_tx_buffers, n_free_buffers - 1); \
436 _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list ( \
437 tm->vlib_main, my_tx_buffers, n_free_buffers, \
438 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); \
439 tm->tx_buffers[thread_index] = my_tx_buffers; \
441 /* buffer shortage */ \
442 if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0)) \
444 *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1]; \
445 _vec_len (my_tx_buffers) -= 1; \
448 #define tcp_return_buffer(tm) \
450 u32 *my_tx_buffers; \
451 u32 thread_index = vlib_get_thread_index(); \
452 my_tx_buffers = tm->tx_buffers[thread_index]; \
453 _vec_len (my_tx_buffers) +=1; \
457 tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
459 vlib_buffer_t *it = b;
462 it->current_data = 0;
463 it->current_length = 0;
464 it->total_length_not_including_first_buffer = 0;
466 while ((it->flags & VLIB_BUFFER_NEXT_PRESENT)
467 && (it = vlib_get_buffer (vm, it->next_buffer)));
469 /* Leave enough space for headers */
470 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
471 vnet_buffer (b)->tcp.flags = 0;
478 tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state,
481 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
482 u8 tcp_opts_len, tcp_hdr_opts_len;
486 wnd = tcp_window_to_advertise (tc, state);
488 /* Make and write options */
489 tcp_opts_len = tcp_make_established_options (tc, snd_opts);
490 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
492 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
493 tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
495 tcp_options_write ((u8 *) (th + 1), snd_opts);
496 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
500 * Convert buffer to ACK
503 tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
505 vlib_main_t *vm = vlib_get_main ();
507 tcp_reuse_buffer (vm, b);
508 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
509 TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
510 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
511 tc->rcv_las = tc->rcv_nxt;
515 * Convert buffer to FIN-ACK
518 tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
520 vlib_main_t *vm = vlib_get_main ();
523 tcp_reuse_buffer (vm, b);
525 flags = TCP_FLAG_FIN | TCP_FLAG_ACK;
526 tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags);
528 /* Reset flags, make sure ack is sent */
529 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
535 * Convert buffer to SYN-ACK
538 tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
540 vlib_main_t *vm = vlib_get_main ();
541 tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
542 u8 tcp_opts_len, tcp_hdr_opts_len;
547 memset (snd_opts, 0, sizeof (*snd_opts));
549 tcp_reuse_buffer (vm, b);
551 /* Set random initial sequence */
552 time_now = tcp_time_now ();
554 tc->iss = random_u32 (&time_now);
555 tc->snd_una = tc->iss;
556 tc->snd_nxt = tc->iss + 1;
557 tc->snd_una_max = tc->snd_nxt;
559 initial_wnd = tcp_initial_window_to_advertise (tc);
561 /* Make and write options */
562 tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
563 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
565 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
566 tc->rcv_nxt, tcp_hdr_opts_len,
567 TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
569 tcp_options_write ((u8 *) (th + 1), snd_opts);
571 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
572 vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
574 /* Init retransmit timer */
575 tcp_retransmit_timer_set (tc);
579 tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
582 u32 *to_next, next_index;
585 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
588 /* Default FIB for now */
589 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
591 /* Send to IP lookup */
592 next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
593 f = vlib_get_frame_to_node (vm, next_index);
595 /* Enqueue the packet */
596 to_next = vlib_frame_vector_args (f);
599 vlib_put_frame_to_node (vm, next_index, f);
603 tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
604 tcp_state_t state, u8 thread_index, u8 is_ip4)
609 ip4_address_t src_ip40, dst_ip40;
610 ip6_address_t src_ip60, dst_ip60;
611 u16 src_port, dst_port;
616 /* Find IP and TCP headers */
617 th0 = tcp_buffer_hdr (b0);
619 /* Save src and dst ip */
622 ih4 = vlib_buffer_get_current (b0);
623 ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
624 src_ip40.as_u32 = ih4->src_address.as_u32;
625 dst_ip40.as_u32 = ih4->dst_address.as_u32;
629 ih6 = vlib_buffer_get_current (b0);
630 ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
631 clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
632 clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
635 src_port = th0->src_port;
636 dst_port = th0->dst_port;
638 /* Try to determine what/why we're actually resetting */
639 if (state == TCP_STATE_CLOSED)
644 tmp = clib_net_to_host_u32 (th0->seq_number);
646 /* Got a SYN for no listener. */
647 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
648 ack = clib_host_to_net_u32 (tmp + 1);
653 flags = TCP_FLAG_RST;
654 seq = th0->ack_number;
658 tcp_reuse_buffer (vm, b0);
659 th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
660 sizeof (tcp_header_t), flags, 0);
664 ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
666 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
671 ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
673 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
681 * Send reset without reusing existing buffer
684 tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4)
688 tcp_main_t *tm = vnet_get_tcp_main ();
689 vlib_main_t *vm = vlib_get_main ();
690 u8 tcp_hdr_len, flags = 0;
691 tcp_header_t *th, *pkt_th;
693 ip4_header_t *ih4, *pkt_ih4;
694 ip6_header_t *ih6, *pkt_ih6;
696 tcp_get_free_buffer_index (tm, &bi);
697 b = vlib_get_buffer (vm, bi);
699 /* Leave enough space for headers */
700 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
702 /* Make and write options */
703 tcp_hdr_len = sizeof (tcp_header_t);
707 pkt_ih4 = vlib_buffer_get_current (pkt);
708 pkt_th = ip4_next_header (pkt_ih4);
712 pkt_ih6 = vlib_buffer_get_current (pkt);
713 pkt_th = ip6_next_header (pkt_ih6);
716 if (tcp_ack (pkt_th))
718 flags = TCP_FLAG_RST;
719 seq = pkt_th->ack_number;
724 flags = TCP_FLAG_RST | TCP_FLAG_ACK;
726 ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end);
729 th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port,
730 seq, ack, tcp_hdr_len, flags, 0);
732 /* Swap src and dst ip */
735 ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
736 ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
737 &pkt_ih4->src_address, IP_PROTOCOL_TCP);
738 th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
743 pkt_ih6 = (ip6_header_t *) (pkt_th - 1);
744 ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
747 vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
748 &pkt_ih6->src_address, IP_PROTOCOL_TCP);
749 th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
753 tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4);
757 tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
759 tcp_header_t *th = vlib_buffer_get_current (b);
764 ih = vlib_buffer_push_ip4 (tm->vlib_main, b, &tc->c_lcl_ip4,
765 &tc->c_rmt_ip4, IP_PROTOCOL_TCP);
766 th->checksum = ip4_tcp_udp_compute_checksum (tm->vlib_main, b, ih);
773 ih = vlib_buffer_push_ip6 (tm->vlib_main, b, &tc->c_lcl_ip6,
774 &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
775 th->checksum = ip6_tcp_udp_icmp_compute_checksum (tm->vlib_main, b, ih,
784 * Builds a SYN packet for a half-open connection and sends it to ipx_lookup.
785 * The packet is not forwarded through tcpx_output to avoid doing lookups
786 * in the half_open pool.
789 tcp_send_syn (tcp_connection_t * tc)
793 tcp_main_t *tm = vnet_get_tcp_main ();
794 vlib_main_t *vm = vlib_get_main ();
795 u8 tcp_hdr_opts_len, tcp_opts_len;
799 tcp_options_t snd_opts;
801 tcp_get_free_buffer_index (tm, &bi);
802 b = vlib_get_buffer (vm, bi);
804 /* Leave enough space for headers */
805 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
807 /* Set random initial sequence */
808 time_now = tcp_time_now ();
810 tc->iss = random_u32 (&time_now);
811 tc->snd_una = tc->iss;
812 tc->snd_una_max = tc->snd_nxt = tc->iss + 1;
814 initial_wnd = tcp_initial_window_to_advertise (tc);
816 /* Make and write options */
817 memset (&snd_opts, 0, sizeof (snd_opts));
818 tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
819 tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
821 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
822 tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
825 tcp_options_write ((u8 *) (th + 1), &snd_opts);
827 /* Measure RTT with this */
828 tc->rtt_ts = tcp_time_now ();
829 tc->rtt_seq = tc->snd_nxt;
831 /* Start retransmit trimer */
832 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK);
835 /* Set the connection establishment timer */
836 tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
838 tcp_push_ip_hdr (tm, tc, b);
839 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
843 tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
845 u32 *to_next, next_index;
848 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
851 /* Decide where to send the packet */
852 next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
854 /* Enqueue the packet */
855 f = vlib_get_frame_to_node (vm, next_index);
856 to_next = vlib_frame_vector_args (f);
859 vlib_put_frame_to_node (vm, next_index, f);
866 tcp_send_fin (tcp_connection_t * tc)
870 tcp_main_t *tm = vnet_get_tcp_main ();
871 vlib_main_t *vm = vlib_get_main ();
873 tcp_get_free_buffer_index (tm, &bi);
874 b = vlib_get_buffer (vm, bi);
876 /* Leave enough space for headers */
877 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
879 tcp_make_fin (tc, b);
880 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
881 tc->flags |= TCP_CONN_FINSNT;
882 tcp_retransmit_timer_force_update (tc);
883 TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
887 tcp_make_state_flags (tcp_state_t next_state)
891 case TCP_STATE_ESTABLISHED:
893 case TCP_STATE_SYN_RCVD:
894 return TCP_FLAG_SYN | TCP_FLAG_ACK;
895 case TCP_STATE_SYN_SENT:
897 case TCP_STATE_LAST_ACK:
898 case TCP_STATE_FIN_WAIT_1:
901 clib_warning ("Shouldn't be here!");
907 * Push TCP header and update connection variables
910 tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b,
911 tcp_state_t next_state, u8 compute_opts)
913 u32 advertise_wnd, data_len;
914 u8 tcp_hdr_opts_len, opts_write_len, flags;
917 data_len = b->current_length + b->total_length_not_including_first_buffer;
918 vnet_buffer (b)->tcp.flags = 0;
921 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
923 tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
924 advertise_wnd = tcp_window_to_advertise (tc, next_state);
925 flags = tcp_make_state_flags (next_state);
927 /* Push header and options */
928 th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
929 tc->rcv_nxt, tcp_hdr_opts_len, flags,
931 opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
933 ASSERT (opts_write_len == tc->snd_opts_len);
934 vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
937 * Update connection variables
940 tc->snd_nxt += data_len;
941 tc->rcv_las = tc->rcv_nxt;
943 /* TODO this is updated in output as well ... */
944 if (seq_gt (tc->snd_nxt, tc->snd_una_max))
946 tc->snd_una_max = tc->snd_nxt;
947 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
950 TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
954 tcp_send_ack (tcp_connection_t * tc)
956 tcp_main_t *tm = vnet_get_tcp_main ();
957 vlib_main_t *vm = vlib_get_main ();
963 tcp_get_free_buffer_index (tm, &bi);
964 b = vlib_get_buffer (vm, bi);
966 /* Fill in the ACK */
967 tcp_make_ack (tc, b);
968 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
971 /* Send delayed ACK when timer expires */
973 tcp_timer_delack_handler (u32 index)
975 u32 thread_index = vlib_get_thread_index ();
976 tcp_connection_t *tc;
978 tc = tcp_connection_get (index, thread_index);
979 tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
983 /** Build a retransmit segment
985 * @return the number of bytes in the segment or 0 if there's nothing to
989 tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
990 u32 offset, u32 max_bytes)
992 vlib_main_t *vm = vlib_get_main ();
996 tcp_reuse_buffer (vm, b);
998 ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
999 ASSERT (max_bytes != 0);
1001 max_bytes = clib_min (tc->snd_mss, max_bytes);
1002 start = tc->snd_una + offset;
1004 /* Start is beyond snd_congestion */
1005 if (seq_geq (start, tc->snd_congestion))
1008 /* Don't overshoot snd_congestion */
1009 if (seq_gt (start + max_bytes, tc->snd_congestion))
1011 max_bytes = tc->snd_congestion - start;
1016 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1018 ASSERT (max_bytes <= tc->snd_mss);
1020 n_bytes = stream_session_peek_bytes (&tc->connection,
1021 vlib_buffer_get_current (b), offset,
1023 ASSERT (n_bytes > 0);
1024 b->current_length = n_bytes;
1025 tcp_push_hdr_i (tc, b, tc->state, 0);
1027 if (tcp_in_fastrecovery (tc))
1028 tc->snd_rxt_bytes += n_bytes;
1031 TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
1036 * Reset congestion control, switch cwnd to loss window and try again.
1039 tcp_rtx_timeout_cc (tcp_connection_t * tc)
1041 tc->prev_ssthresh = tc->ssthresh;
1042 tc->prev_cwnd = tc->cwnd;
1044 /* Cleanly recover cc (also clears up fast retransmit) */
1045 if (tcp_in_fastrecovery (tc))
1046 tcp_cc_fastrecovery_exit (tc);
1048 /* Start again from the beginning */
1049 tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
1050 tc->cwnd = tcp_loss_wnd (tc);
1051 tc->snd_congestion = tc->snd_una_max;
1053 tcp_recovery_on (tc);
1057 tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
1059 tcp_main_t *tm = vnet_get_tcp_main ();
1060 vlib_main_t *vm = vlib_get_main ();
1061 u32 thread_index = vlib_get_thread_index ();
1062 tcp_connection_t *tc;
1068 tc = tcp_half_open_connection_get (index);
1072 tc = tcp_connection_get (index, thread_index);
1075 /* Make sure timer handle is set to invalid */
1076 tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
1078 if (!tcp_in_recovery (tc) && tc->rto_boff > 0
1079 && tc->state >= TCP_STATE_ESTABLISHED)
1082 tcp_update_rto (tc);
1085 /* Increment RTO backoff (also equal to number of retries) */
1088 /* Go back to first un-acked byte */
1089 tc->snd_nxt = tc->snd_una;
1091 tcp_get_free_buffer_index (tm, &bi);
1092 b = vlib_get_buffer (vm, bi);
1094 if (tc->state >= TCP_STATE_ESTABLISHED)
1096 /* Lost FIN, retransmit and return */
1097 if (tc->flags & TCP_CONN_FINSNT)
1103 /* First retransmit timeout */
1104 if (tc->rto_boff == 1)
1105 tcp_rtx_timeout_cc (tc);
1107 /* Exponential backoff */
1108 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1110 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
1112 /* Send one segment */
1113 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1114 /* TODO be less aggressive about this */
1115 scoreboard_clear (&tc->sack_sb);
1119 clib_warning ("could not retransmit anything");
1120 clib_warning ("%U", format_tcp_connection, tc, 2);
1122 /* Try again eventually */
1123 tcp_retransmit_timer_set (tc);
1124 ASSERT (0 || (tc->rto_boff > 1
1125 && tc->snd_una == tc->snd_congestion));
1129 /* For first retransmit, record timestamp (Eifel detection RFC3522) */
1130 if (tc->rto_boff == 1)
1131 tc->snd_rxt_ts = tcp_time_now ();
1133 /* Retransmit for SYN/SYNACK */
1134 else if (tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_SYN_SENT)
1136 /* Try without increasing RTO a number of times. If this fails,
1137 * start growing RTO exponentially */
1138 if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
1139 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1141 vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
1143 tcp_push_hdr_i (tc, b, tc->state, 1);
1145 /* Account for the SYN */
1150 ASSERT (tc->state == TCP_STATE_CLOSED);
1151 clib_warning ("connection closed ...");
1157 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1159 /* Re-enable retransmit timer */
1160 tcp_retransmit_timer_set (tc);
1164 ASSERT (tc->state == TCP_STATE_SYN_SENT);
1166 TCP_EVT_DBG (TCP_EVT_SYN_RTX, tc);
1168 /* This goes straight to ipx_lookup */
1169 tcp_push_ip_hdr (tm, tc, b);
1170 tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
1172 /* Re-enable retransmit timer */
1173 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN,
1174 tc->rto * TCP_TO_TIMER_TICK);
1179 tcp_timer_retransmit_handler (u32 index)
1181 tcp_timer_retransmit_handler_i (index, 0);
1185 tcp_timer_retransmit_syn_handler (u32 index)
1187 tcp_timer_retransmit_handler_i (index, 1);
1191 * Got 0 snd_wnd from peer, try to do something about it.
1195 tcp_timer_persist_handler (u32 index)
1197 tcp_main_t *tm = vnet_get_tcp_main ();
1198 vlib_main_t *vm = vlib_get_main ();
1199 u32 thread_index = vlib_get_thread_index ();
1200 tcp_connection_t *tc;
1202 u32 bi, old_snd_nxt;
1205 tc = tcp_connection_get_if_valid (index, thread_index);
1210 /* Make sure timer handle is set to invalid */
1211 tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
1213 /* Problem already solved or worse */
1214 if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
1215 || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
1218 /* Increment RTO backoff */
1220 tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
1222 /* Try to force the first unsent segment */
1223 tcp_get_free_buffer_index (tm, &bi);
1224 b = vlib_get_buffer (vm, bi);
1226 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
1227 tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
1228 n_bytes = stream_session_peek_bytes (&tc->connection,
1229 vlib_buffer_get_current (b),
1230 tc->snd_una_max - tc->snd_una,
1232 /* Nothing to send */
1235 clib_warning ("persist found nothing to send");
1236 tcp_return_buffer (tm);
1240 b->current_length = n_bytes;
1241 ASSERT (tc->snd_nxt == tc->snd_una_max || tc->rto_boff > 1
1242 || tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
1244 /* Allow updating of snd_una_max but don't update snd_nxt */
1245 old_snd_nxt = tc->snd_nxt;
1246 tcp_push_hdr_i (tc, b, tc->state, 0);
1247 tc->snd_nxt = old_snd_nxt;
1248 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1250 /* Re-enable persist timer */
1251 tcp_persist_timer_set (tc);
1255 * Retransmit first unacked segment
1258 tcp_retransmit_first_unacked (tcp_connection_t * tc)
1260 tcp_main_t *tm = vnet_get_tcp_main ();
1261 vlib_main_t *vm = vlib_get_main ();
1263 u32 bi, n_bytes, old_snd_nxt;
1265 old_snd_nxt = tc->snd_nxt;
1266 tc->snd_nxt = tc->snd_una;
1269 tcp_get_free_buffer_index (tm, &bi);
1270 b = vlib_get_buffer (vm, bi);
1272 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
1274 n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
1277 tcp_return_buffer (tm);
1281 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1284 tc->snd_nxt = old_snd_nxt;
1288 * Do fast retransmit with SACKs
1291 tcp_fast_retransmit_sack (tcp_connection_t * tc)
1293 tcp_main_t *tm = vnet_get_tcp_main ();
1294 vlib_main_t *vm = vlib_get_main ();
1295 u32 n_written = 0, offset = 0, max_bytes;
1297 sack_scoreboard_hole_t *hole;
1298 sack_scoreboard_t *sb;
1299 u32 bi, old_snd_nxt;
1301 u8 snd_limited = 0, can_rescue = 0;
1303 ASSERT (tcp_in_fastrecovery (tc));
1304 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1306 old_snd_nxt = tc->snd_nxt;
1308 snd_space = tcp_available_snd_space (tc);
1310 hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
1311 while (hole && snd_space > 0)
1313 tcp_get_free_buffer_index (tm, &bi);
1314 b = vlib_get_buffer (vm, bi);
1316 hole = scoreboard_next_rxt_hole (sb, hole,
1317 tcp_fastrecovery_sent_1_smss (tc),
1318 &can_rescue, &snd_limited);
1321 if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
1322 || seq_gt (sb->rescue_rxt,
1323 tc->snd_congestion)))
1326 /* If rescue rxt undefined or less than snd_una then one segment of
1327 * up to SMSS octets that MUST include the highest outstanding
1328 * unSACKed sequence number SHOULD be returned, and RescueRxt set to
1329 * RecoveryPoint. HighRxt MUST NOT be updated.
1331 max_bytes = clib_min (tc->snd_mss, snd_space);
1332 offset = tc->snd_congestion - tc->snd_una - max_bytes;
1333 sb->rescue_rxt = tc->snd_congestion;
1334 tc->snd_nxt = tc->snd_una + offset;
1335 tcp_prepare_retransmit_segment (tc, b, offset, max_bytes);
1336 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1340 max_bytes = snd_limited ? tc->snd_mss : hole->end - sb->high_rxt;
1341 offset = sb->high_rxt - tc->snd_una;
1342 tc->snd_nxt = tc->snd_una + offset;
1343 n_written = tcp_prepare_retransmit_segment (tc, b, offset, max_bytes);
1345 /* Nothing left to retransmit */
1348 tcp_return_buffer (tm);
1352 sb->high_rxt += n_written;
1353 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1354 snd_space -= n_written;
1357 /* If window allows, send 1 SMSS of new data */
1358 tc->snd_nxt = old_snd_nxt;
1362 * Fast retransmit without SACK info
1365 tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
1367 tcp_main_t *tm = vnet_get_tcp_main ();
1368 vlib_main_t *vm = vlib_get_main ();
1369 u32 n_written = 0, offset = 0, bi, old_snd_nxt;
1373 ASSERT (tcp_in_fastrecovery (tc));
1374 TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
1376 /* Start resending from first un-acked segment */
1377 old_snd_nxt = tc->snd_nxt;
1378 tc->snd_nxt = tc->snd_una;
1379 snd_space = tcp_available_snd_space (tc);
1381 while (snd_space > 0)
1383 tcp_get_free_buffer_index (tm, &bi);
1384 b = vlib_get_buffer (vm, bi);
1386 offset += n_written;
1387 n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
1389 /* Nothing left to retransmit */
1392 tcp_return_buffer (tm);
1396 tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
1397 snd_space -= n_written;
1400 /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
1401 tc->snd_nxt = old_snd_nxt;
1405 * Do fast retransmit
1408 tcp_fast_retransmit (tcp_connection_t * tc)
1410 if (tcp_opts_sack_permitted (&tc->rcv_opts)
1411 && scoreboard_first_hole (&tc->sack_sb))
1412 tcp_fast_retransmit_sack (tc);
1414 tcp_fast_retransmit_no_sack (tc);
1418 tcp_session_has_ooo_data (tcp_connection_t * tc)
1420 stream_session_t *s =
1421 stream_session_get (tc->c_s_index, tc->c_thread_index);
1422 return svm_fifo_has_ooo_data (s->server_rx_fifo);
1426 tcp46_output_inline (vlib_main_t * vm,
1427 vlib_node_runtime_t * node,
1428 vlib_frame_t * from_frame, int is_ip4)
1430 u32 n_left_from, next_index, *from, *to_next;
1431 u32 my_thread_index = vm->thread_index;
1433 from = vlib_frame_vector_args (from_frame);
1434 n_left_from = from_frame->n_vectors;
1436 next_index = node->cached_next_index;
1438 while (n_left_from > 0)
1442 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1444 while (n_left_from > 0 && n_left_to_next > 0)
1448 tcp_connection_t *tc0;
1450 tcp_header_t *th0 = 0;
1451 u32 error0 = TCP_ERROR_PKTS_SENT, next0 = TCP_OUTPUT_NEXT_DROP;
1458 n_left_to_next -= 1;
1460 b0 = vlib_get_buffer (vm, bi0);
1461 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1463 if (PREDICT_FALSE (tc0 == 0 || tc0->state == TCP_STATE_CLOSED))
1465 error0 = TCP_ERROR_INVALID_CONNECTION;
1466 next0 = TCP_OUTPUT_NEXT_DROP;
1470 th0 = vlib_buffer_get_current (b0);
1471 TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
1476 ih0 = vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4,
1477 &tc0->c_rmt_ip4, IP_PROTOCOL_TCP);
1478 th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih0);
1485 ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
1486 &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
1487 th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih0,
1492 /* Filter out DUPACKs if there are no OOO segments left */
1494 (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
1496 if (!tcp_session_has_ooo_data (tc0))
1498 error0 = TCP_ERROR_FILTERED_DUPACKS;
1499 next0 = TCP_OUTPUT_NEXT_DROP;
1504 /* Stop DELACK timer and fix flags */
1505 tc0->flags &= ~(TCP_CONN_SNDACK);
1506 tcp_timer_reset (tc0, TCP_TIMER_DELACK);
1508 /* If not retransmitting
1509 * 1) update snd_una_max (SYN, SYNACK, FIN)
1510 * 2) If we're not tracking an ACK, start tracking */
1511 if (seq_lt (tc0->snd_una_max, tc0->snd_nxt))
1513 tc0->snd_una_max = tc0->snd_nxt;
1514 if (tc0->rtt_ts == 0)
1516 tc0->rtt_ts = tcp_time_now ();
1517 tc0->rtt_seq = tc0->snd_nxt;
1521 /* Set the retransmit timer if not set already and not
1522 * doing a pure ACK */
1523 if (!tcp_timer_is_active (tc0, TCP_TIMER_RETRANSMIT)
1524 && tc0->snd_nxt != tc0->snd_una)
1526 tcp_retransmit_timer_set (tc0);
1530 /* Make sure we haven't lost route to our peer */
1531 if (PREDICT_FALSE (tc0->last_fib_check
1532 < tc0->snd_opts.tsval + TCP_FIB_RECHECK_PERIOD))
1535 (tc0->c_rmt_fei == tcp_lookup_rmt_in_fib (tc0)))
1537 tc0->last_fib_check = tc0->snd_opts.tsval;
1541 clib_warning ("lost connection to peer");
1542 tcp_connection_reset (tc0);
1547 /* Use pre-computed dpo to set next node */
1548 next0 = tc0->c_rmt_dpo.dpoi_next_node;
1549 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = tc0->c_rmt_dpo.dpoi_index;
1551 b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
1553 b0->error = node->errors[error0];
1554 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1556 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1559 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1563 memset (&t0->tcp_header, 0, sizeof (t0->tcp_header));
1565 clib_memcpy (&t0->tcp_connection, tc0,
1566 sizeof (t0->tcp_connection));
1569 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1570 n_left_to_next, bi0, next0);
1573 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1576 return from_frame->n_vectors;
1580 tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1581 vlib_frame_t * from_frame)
1583 return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1587 tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node,
1588 vlib_frame_t * from_frame)
1590 return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1594 VLIB_REGISTER_NODE (tcp4_output_node) =
1596 .function = tcp4_output,.name = "tcp4-output",
1597 /* Takes a vector of packets. */
1598 .vector_size = sizeof (u32),
1599 .n_errors = TCP_N_ERROR,
1600 .error_strings = tcp_error_strings,
1601 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1603 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1604 foreach_tcp4_output_next
1607 .format_buffer = format_tcp_header,
1608 .format_trace = format_tcp_tx_trace,
1612 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output);
1615 VLIB_REGISTER_NODE (tcp6_output_node) =
1617 .function = tcp6_output,
1618 .name = "tcp6-output",
1619 /* Takes a vector of packets. */
1620 .vector_size = sizeof (u32),
1621 .n_errors = TCP_N_ERROR,
1622 .error_strings = tcp_error_strings,
1623 .n_next_nodes = TCP_OUTPUT_N_NEXT,
1625 #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n,
1626 foreach_tcp6_output_next
1629 .format_buffer = format_tcp_header,
1630 .format_trace = format_tcp_tx_trace,
1634 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output);
1637 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
1639 tcp_connection_t *tc;
1641 tc = (tcp_connection_t *) tconn;
1642 tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0);
1644 if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
1646 tc->rtt_ts = tcp_time_now ();
1647 tc->rtt_seq = tc->snd_nxt;
1652 typedef enum _tcp_reset_next
1654 TCP_RESET_NEXT_DROP,
1655 TCP_RESET_NEXT_IP_LOOKUP,
1659 #define foreach_tcp4_reset_next \
1660 _(DROP, "error-drop") \
1661 _(IP_LOOKUP, "ip4-lookup")
1663 #define foreach_tcp6_reset_next \
1664 _(DROP, "error-drop") \
1665 _(IP_LOOKUP, "ip6-lookup")
1668 tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1669 vlib_frame_t * from_frame, u8 is_ip4)
1671 u32 n_left_from, next_index, *from, *to_next;
1672 u32 my_thread_index = vm->thread_index;
1674 from = vlib_frame_vector_args (from_frame);
1675 n_left_from = from_frame->n_vectors;
1677 next_index = node->cached_next_index;
1679 while (n_left_from > 0)
1683 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1685 while (n_left_from > 0 && n_left_to_next > 0)
1691 u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
1698 n_left_to_next -= 1;
1700 b0 = vlib_get_buffer (vm, bi0);
1702 if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
1703 my_thread_index, is_ip4))
1705 error0 = TCP_ERROR_LOOKUP_DROPS;
1706 next0 = TCP_RESET_NEXT_DROP;
1710 /* Prepare to send to IP lookup */
1711 vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0;
1712 next0 = TCP_RESET_NEXT_IP_LOOKUP;
1715 b0->error = node->errors[error0];
1716 b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
1717 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1719 th0 = vlib_buffer_get_current (b0);
1721 th0 = ip4_next_header ((ip4_header_t *) th0);
1723 th0 = ip6_next_header ((ip6_header_t *) th0);
1724 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1725 clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1728 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1729 n_left_to_next, bi0, next0);
1731 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1733 return from_frame->n_vectors;
1737 tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1738 vlib_frame_t * from_frame)
1740 return tcp46_send_reset_inline (vm, node, from_frame, 1);
1744 tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node,
1745 vlib_frame_t * from_frame)
1747 return tcp46_send_reset_inline (vm, node, from_frame, 0);
1751 VLIB_REGISTER_NODE (tcp4_reset_node) = {
1752 .function = tcp4_send_reset,
1753 .name = "tcp4-reset",
1754 .vector_size = sizeof (u32),
1755 .n_errors = TCP_N_ERROR,
1756 .error_strings = tcp_error_strings,
1757 .n_next_nodes = TCP_RESET_N_NEXT,
1759 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1760 foreach_tcp4_reset_next
1763 .format_trace = format_tcp_tx_trace,
1767 VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset);
1770 VLIB_REGISTER_NODE (tcp6_reset_node) = {
1771 .function = tcp6_send_reset,
1772 .name = "tcp6-reset",
1773 .vector_size = sizeof (u32),
1774 .n_errors = TCP_N_ERROR,
1775 .error_strings = tcp_error_strings,
1776 .n_next_nodes = TCP_RESET_N_NEXT,
1778 #define _(s,n) [TCP_RESET_NEXT_##s] = n,
1779 foreach_tcp6_reset_next
1782 .format_trace = format_tcp_tx_trace,
1786 VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset);
1789 * fd.io coding-style-patch-verification: ON
1792 * eval: (c-set-style "gnu")