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.
19 #include <vnet/vnet.h>
20 #include <vnet/ip/ip.h>
21 #include <vnet/tcp/tcp_packet.h>
22 #include <vnet/tcp/tcp_timer.h>
23 #include <vnet/session/transport.h>
24 #include <vnet/session/session.h>
25 #include <vnet/tcp/tcp_debug.h>
27 #define TCP_TICK 0.001 /**< TCP tick period (s) */
28 #define THZ (u32) (1/TCP_TICK) /**< TCP tick frequency */
29 #define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */
30 #define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
31 #define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
32 #define TCP_MAX_OPTION_SPACE 40
34 #define TCP_DUPACK_THRESHOLD 3
35 #define TCP_MAX_RX_FIFO_SIZE 4 << 20
36 #define TCP_MIN_RX_FIFO_SIZE 4 << 10
37 #define TCP_IW_N_SEGMENTS 10
38 #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */
39 #define TCP_USE_SACKS 1 /**< Disable only for testing */
41 /** TCP FSM state definitions as per RFC793. */
42 #define foreach_tcp_fsm_state \
45 _(SYN_SENT, "SYN_SENT") \
46 _(SYN_RCVD, "SYN_RCVD") \
47 _(ESTABLISHED, "ESTABLISHED") \
48 _(CLOSE_WAIT, "CLOSE_WAIT") \
49 _(FIN_WAIT_1, "FIN_WAIT_1") \
50 _(LAST_ACK, "LAST_ACK") \
51 _(CLOSING, "CLOSING") \
52 _(FIN_WAIT_2, "FIN_WAIT_2") \
53 _(TIME_WAIT, "TIME_WAIT")
55 typedef enum _tcp_state
57 #define _(sym, str) TCP_STATE_##sym,
63 format_function_t format_tcp_state;
64 format_function_t format_tcp_flags;
65 format_function_t format_tcp_sacks;
66 format_function_t format_tcp_rcv_sacks;
69 #define foreach_tcp_timer \
70 _(RETRANSMIT, "RETRANSMIT") \
71 _(DELACK, "DELAYED ACK") \
72 _(PERSIST, "PERSIST") \
74 _(WAITCLOSE, "WAIT CLOSE") \
75 _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
76 _(ESTABLISH, "ESTABLISH")
78 typedef enum _tcp_timers
80 #define _(sym, str) TCP_TIMER_##sym,
86 typedef void (timer_expiration_handler) (u32 index);
88 extern timer_expiration_handler tcp_timer_delack_handler;
89 extern timer_expiration_handler tcp_timer_retransmit_handler;
90 extern timer_expiration_handler tcp_timer_persist_handler;
91 extern timer_expiration_handler tcp_timer_retransmit_syn_handler;
93 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
95 /* Timer delays as multiples of 100ms */
96 #define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP
97 * ticks to timer units */
98 #define TCP_DELACK_TIME 1 /* 0.1s */
99 #define TCP_ESTABLISH_TIME 750 /* 75s */
100 #define TCP_2MSL_TIME 300 /* 30s */
101 #define TCP_CLOSEWAIT_TIME 20 /* 0.1s */
102 #define TCP_CLEANUP_TIME 5 /* 0.5s Time to wait before cleanup */
103 #define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */
105 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
106 #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
107 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
108 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
109 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
111 /** TCP connection flags */
112 #define foreach_tcp_connection_flag \
113 _(SNDACK, "Send ACK") \
114 _(FINSNT, "FIN sent") \
115 _(SENT_RCV_WND0, "Sent 0 receive window") \
116 _(RECOVERY, "Recovery on") \
117 _(FAST_RECOVERY, "Fast Recovery on") \
118 _(FR_1_SMSS, "Sent 1 SMSS")
120 typedef enum _tcp_connection_flag_bits
122 #define _(sym, str) TCP_CONN_##sym##_BIT,
123 foreach_tcp_connection_flag
126 } tcp_connection_flag_bits_e;
128 typedef enum _tcp_connection_flag
130 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
131 foreach_tcp_connection_flag
134 } tcp_connection_flags_e;
136 /** TCP buffer flags */
137 #define foreach_tcp_buf_flag \
138 _ (ACK) /**< Sending ACK. */ \
139 _ (DUPACK) /**< Sending DUPACK. */ \
143 #define _(f) TCP_BUF_BIT_##f,
151 #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f,
156 #define TCP_SCOREBOARD_TRACE (0)
157 #define TCP_MAX_SACK_BLOCKS 15 /**< Max number of SACK blocks stored */
158 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
160 typedef struct _scoreboard_trace_elt
167 } scoreboard_trace_elt_t;
169 typedef struct _sack_scoreboard_hole
171 u32 next; /**< Index for next entry in linked list */
172 u32 prev; /**< Index for previous entry in linked list */
173 u32 start; /**< Start sequence number */
174 u32 end; /**< End sequence number */
175 u8 is_lost; /**< Mark hole as lost */
176 } sack_scoreboard_hole_t;
178 typedef struct _sack_scoreboard
180 sack_scoreboard_hole_t *holes; /**< Pool of holes */
181 u32 head; /**< Index of first entry */
182 u32 tail; /**< Index of last entry */
183 u32 sacked_bytes; /**< Number of bytes sacked in sb */
184 u32 last_sacked_bytes; /**< Number of bytes last sacked */
185 u32 last_bytes_delivered; /**< Number of sack bytes delivered */
186 u32 snd_una_adv; /**< Bytes to add to snd_una */
187 u32 high_sacked; /**< Highest byte sacked (fack) */
188 u32 high_rxt; /**< Highest retransmitted sequence */
189 u32 rescue_rxt; /**< Rescue sequence number */
190 u32 lost_bytes; /**< Bytes lost as per RFC6675 */
191 u32 cur_rxt_hole; /**< Retransmitting from this hole */
193 #if TCP_SCOREBOARD_TRACE
194 scoreboard_trace_elt_t *trace;
199 #if TCP_SCOREBOARD_TRACE
200 #define tcp_scoreboard_trace_add(_tc, _ack) \
202 static u64 _group = 0; \
203 sack_scoreboard_t *_sb = &_tc->sack_sb; \
204 sack_block_t *_sack, *_sacks; \
205 scoreboard_trace_elt_t *_elt; \
208 _sacks = _tc->rcv_opts.sacks; \
209 for (i = 0; i < vec_len (_sacks); i++) \
211 _sack = &_sacks[i]; \
212 vec_add2 (_sb->trace, _elt, 1); \
213 _elt->start = _sack->start; \
214 _elt->end = _sack->end; \
215 _elt->ack = _elt->end == _ack ? _ack : 0; \
216 _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \
217 _elt->group = _group; \
221 #define tcp_scoreboard_trace_add(_tc, _ack)
224 typedef enum _tcp_cc_algorithm_type
227 } tcp_cc_algorithm_type_e;
229 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
231 typedef enum _tcp_cc_ack_t
238 typedef struct _tcp_connection
240 transport_connection_t connection; /**< Common transport data. First! */
242 u8 state; /**< TCP state as per tcp_state_t */
243 u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
244 u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
248 /** Send sequence variables RFC793 */
249 u32 snd_una; /**< oldest unacknowledged sequence number */
250 u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
251 u32 snd_wnd; /**< send window */
252 u32 snd_wl1; /**< seq number used for last snd.wnd update */
253 u32 snd_wl2; /**< ack number used for last snd.wnd update */
254 u32 snd_nxt; /**< next seq number to be sent */
255 u16 snd_mss; /**< Effective send max seg (data) size */
257 /** Receive sequence variables RFC793 */
258 u32 rcv_nxt; /**< next sequence number expected */
259 u32 rcv_wnd; /**< receive window we expect */
261 u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
262 u32 iss; /**< initial sent sequence */
263 u32 irs; /**< initial remote sequence */
266 tcp_options_t rcv_opts; /**< Rx options for connection */
267 tcp_options_t snd_opts; /**< Tx options for connection */
268 u8 snd_opts_len; /**< Tx options len */
269 u8 rcv_wscale; /**< Window scale to advertise to peer */
270 u8 snd_wscale; /**< Window scale to use when sending */
271 u32 tsval_recent; /**< Last timestamp received */
272 u32 tsval_recent_age; /**< When last updated tstamp_recent*/
274 sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
275 sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
277 u16 rcv_dupacks; /**< Number of DUPACKs received */
278 u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */
280 /* Congestion control */
281 u32 cwnd; /**< Congestion window */
282 u32 ssthresh; /**< Slow-start threshold */
283 u32 prev_ssthresh; /**< ssthresh before congestion */
284 u32 prev_cwnd; /**< ssthresh before congestion */
285 u32 bytes_acked; /**< Bytes acknowledged by current segment */
286 u32 snd_rxt_bytes; /**< Retransmitted bytes */
287 u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
288 u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
289 u32 snd_congestion; /**< snd_una_max when congestion is detected */
290 tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
293 u32 rto; /**< Retransmission timeout */
294 u32 rto_boff; /**< Index for RTO backoff */
295 u32 srtt; /**< Smoothed RTT */
296 u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
297 u32 rtt_ts; /**< Timestamp for tracked ACK */
298 u32 rtt_seq; /**< Sequence number for tracked ACK */
300 u16 mss; /**< Our max seg size that includes options */
301 u32 limited_transmit; /**< snd_nxt when limited transmit starts */
302 u32 last_fib_check; /**< Last time we checked fib route for peer */
305 struct _tcp_cc_algorithm
307 void (*rcv_ack) (tcp_connection_t * tc);
308 void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack);
309 void (*congestion) (tcp_connection_t * tc);
310 void (*recovered) (tcp_connection_t * tc);
311 void (*init) (tcp_connection_t * tc);
314 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
315 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
316 #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
317 #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
318 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
319 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
320 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
321 #define tcp_fastrecovery_sent_1_smss(tc) ((tc)->flags & TCP_CONN_FR_1_SMSS)
322 #define tcp_fastrecovery_1_smss_on(tc) ((tc)->flags |= TCP_CONN_FR_1_SMSS)
323 #define tcp_fastrecovery_1_smss_off(tc) ((tc)->flags &= ~TCP_CONN_FR_1_SMSS)
325 #define tcp_in_cong_recovery(tc) ((tc)->flags & \
326 (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
329 tcp_cong_recovery_off (tcp_connection_t * tc)
331 tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
332 tcp_fastrecovery_1_smss_off (tc);
342 typedef enum _tcp_error
344 #define tcp_error(n,s) TCP_ERROR_##n,
345 #include <vnet/tcp/tcp_error.def>
350 typedef struct _tcp_lookup_dispatch
353 } tcp_lookup_dispatch_t;
355 typedef struct _tcp_main
357 /* Per-worker thread tcp connection pools */
358 tcp_connection_t **connections;
360 /* Pool of listeners. */
361 tcp_connection_t *listener_pool;
363 /** Dispatch table by state and flags */
364 tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
366 u8 log2_tstamp_clocks_per_tick;
367 f64 tstamp_ticks_per_clock;
369 /** per-worker tx buffer free lists */
372 /* Per worker-thread timer wheel for connections timers */
373 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
375 /* Pool of half-open connections on which we've sent a SYN */
376 tcp_connection_t *half_open_connections;
377 clib_spinlock_t half_open_lock;
379 /* Pool of local TCP endpoints */
380 transport_endpoint_t *local_endpoints;
382 /* Local endpoints lookup table */
383 transport_endpoint_table_t local_endpoints_table;
385 /* Congestion control algorithms registered */
386 tcp_cc_algorithm_t *cc_algos;
388 /* Flag that indicates if stack is on or off */
391 /** Number of preallocated connections */
392 u32 preallocated_connections;
393 u32 preallocated_half_open_connections;
395 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
396 ip4_address_t *ip4_src_addresses;
397 u32 last_v4_address_rotor;
398 u32 last_v6_address_rotor;
399 ip6_address_t *ip6_src_addresses;
402 vlib_main_t *vlib_main;
403 vnet_main_t *vnet_main;
404 ip4_main_t *ip4_main;
405 ip6_main_t *ip6_main;
408 extern tcp_main_t tcp_main;
409 extern vlib_node_registration_t tcp4_input_node;
410 extern vlib_node_registration_t tcp6_input_node;
411 extern vlib_node_registration_t tcp4_output_node;
412 extern vlib_node_registration_t tcp6_output_node;
414 always_inline tcp_main_t *
420 always_inline tcp_header_t *
421 tcp_buffer_hdr (vlib_buffer_t * b)
423 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
424 return (tcp_header_t *) (b->data + b->current_data
425 + vnet_buffer (b)->tcp.hdr_offset);
428 clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
430 always_inline tcp_connection_t *
431 tcp_connection_get (u32 conn_index, u32 thread_index)
433 if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
435 return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
438 always_inline tcp_connection_t *
439 tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
441 if (tcp_main.connections[thread_index] == 0)
443 if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
445 return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
448 always_inline tcp_connection_t *
449 tcp_get_connection_from_transport (transport_connection_t * tconn)
451 return (tcp_connection_t *) tconn;
454 void tcp_connection_close (tcp_connection_t * tc);
455 void tcp_connection_cleanup (tcp_connection_t * tc);
456 void tcp_connection_del (tcp_connection_t * tc);
457 void tcp_half_open_connection_del (tcp_connection_t * tc);
458 tcp_connection_t *tcp_connection_new (u8 thread_index);
459 void tcp_connection_reset (tcp_connection_t * tc);
461 u8 *format_tcp_connection_id (u8 * s, va_list * args);
462 u8 *format_tcp_connection (u8 * s, va_list * args);
463 u8 *format_tcp_scoreboard (u8 * s, va_list * args);
465 u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose);
467 always_inline tcp_connection_t *
468 tcp_listener_get (u32 tli)
470 return pool_elt_at_index (tcp_main.listener_pool, tli);
473 always_inline tcp_connection_t *
474 tcp_half_open_connection_get (u32 conn_index)
476 if (pool_is_free_index (tcp_main.half_open_connections, conn_index))
478 return pool_elt_at_index (tcp_main.half_open_connections, conn_index);
481 void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b);
482 void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b);
483 void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b);
484 void tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4);
485 void tcp_send_syn (tcp_connection_t * tc);
486 void tcp_send_fin (tcp_connection_t * tc);
487 void tcp_init_mss (tcp_connection_t * tc);
488 void tcp_update_snd_mss (tcp_connection_t * tc);
489 void tcp_update_rto (tcp_connection_t * tc);
492 tcp_end_seq (tcp_header_t * th, u32 len)
494 return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
497 /* Modulo arithmetic for TCP sequence numbers */
498 #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
499 #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
500 #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
501 #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
502 #define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
504 /* Modulo arithmetic for timestamps */
505 #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
506 #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
509 * Our estimate of the number of bytes that have left the network
512 tcp_bytes_out (const tcp_connection_t * tc)
514 if (tcp_opts_sack_permitted (&tc->rcv_opts))
515 return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes;
517 return tc->rcv_dupacks * tc->snd_mss;
521 * Our estimate of the number of bytes in flight (pipe size)
524 tcp_flight_size (const tcp_connection_t * tc)
528 flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc)
535 ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d",
536 tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc),
537 tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes,
546 * Initial cwnd as per RFC5681
549 tcp_initial_cwnd (const tcp_connection_t * tc)
551 if (tc->snd_mss > 2190)
552 return 2 * tc->snd_mss;
553 else if (tc->snd_mss > 1095)
554 return 3 * tc->snd_mss;
556 return 4 * tc->snd_mss;
560 tcp_loss_wnd (const tcp_connection_t * tc)
566 tcp_available_wnd (const tcp_connection_t * tc)
568 return clib_min (tc->cwnd, tc->snd_wnd);
572 tcp_available_snd_space (const tcp_connection_t * tc)
574 u32 available_wnd = tcp_available_wnd (tc);
575 u32 flight_size = tcp_flight_size (tc);
577 if (available_wnd <= flight_size)
580 return available_wnd - flight_size;
583 i32 tcp_rcv_wnd_available (tcp_connection_t * tc);
584 u32 tcp_snd_space (tcp_connection_t * tc);
585 void tcp_update_rcv_wnd (tcp_connection_t * tc);
587 void tcp_retransmit_first_unacked (tcp_connection_t * tc);
588 void tcp_fast_retransmit_no_sack (tcp_connection_t * tc);
589 void tcp_fast_retransmit_sack (tcp_connection_t * tc);
590 void tcp_fast_retransmit (tcp_connection_t * tc);
591 void tcp_cc_init_congestion (tcp_connection_t * tc);
592 int tcp_cc_recover (tcp_connection_t * tc);
593 void tcp_cc_fastrecovery_exit (tcp_connection_t * tc);
595 fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
597 /* Made public for unit testing only */
598 void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
603 return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
607 tcp_update_time (f64 now, u32 thread_index)
609 tw_timer_expire_timers_16t_2w_512sl (&tcp_main.timer_wheels[thread_index],
613 u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
616 tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
617 u32 offset, u32 max_bytes);
619 void tcp_connection_timers_init (tcp_connection_t * tc);
620 void tcp_connection_timers_reset (tcp_connection_t * tc);
621 void tcp_connection_init_vars (tcp_connection_t * tc);
624 tcp_connection_force_ack (tcp_connection_t * tc, vlib_buffer_t * b)
626 /* Reset flags, make sure ack is sent */
627 tc->flags = TCP_CONN_SNDACK;
628 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
632 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
634 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
636 = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
637 tc->c_c_index, timer_id, interval);
641 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
643 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
644 if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
647 tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
648 tc->timers[timer_id]);
649 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
653 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
655 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
656 if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
657 tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
658 tc->timers[timer_id]);
659 tc->timers[timer_id] =
660 tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
661 tc->c_c_index, timer_id, interval);
665 tcp_retransmit_timer_set (tcp_connection_t * tc)
667 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
668 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
672 tcp_retransmit_timer_reset (tcp_connection_t * tc)
674 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
678 tcp_retransmit_timer_force_update (tcp_connection_t * tc)
680 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
681 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
685 tcp_persist_timer_set (tcp_connection_t * tc)
687 /* Reuse RTO. It's backed off in handler */
688 tcp_timer_set (tc, TCP_TIMER_PERSIST,
689 clib_max (tc->rto * TCP_TO_TIMER_TICK,
690 TCP_TIMER_PERSIST_MIN));
694 tcp_persist_timer_update (tcp_connection_t * tc)
696 tcp_timer_update (tc, TCP_TIMER_PERSIST,
697 clib_max (tc->rto * TCP_TO_TIMER_TICK,
698 TCP_TIMER_PERSIST_MIN));
702 tcp_persist_timer_reset (tcp_connection_t * tc)
704 tcp_timer_reset (tc, TCP_TIMER_PERSIST);
708 tcp_retransmit_timer_update (tcp_connection_t * tc)
710 if (tc->snd_una == tc->snd_una_max)
712 tcp_retransmit_timer_reset (tc);
713 if (tc->snd_wnd < tc->snd_mss)
714 tcp_persist_timer_set (tc);
717 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
718 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
722 tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
724 return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
727 #define tcp_validate_txf_size(_tc, _a) \
728 ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
729 || stream_session_tx_fifo_max_dequeue (&_tc->connection) >= _a)
732 scoreboard_remove_hole (sack_scoreboard_t * sb,
733 sack_scoreboard_hole_t * hole);
734 void scoreboard_update_lost (tcp_connection_t * tc, sack_scoreboard_t * sb);
735 sack_scoreboard_hole_t *scoreboard_insert_hole (sack_scoreboard_t * sb,
736 u32 prev_index, u32 start,
738 sack_scoreboard_hole_t *scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
739 sack_scoreboard_hole_t *
740 start, u8 have_sent_1_smss,
743 void scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 seq);
745 always_inline sack_scoreboard_hole_t *
746 scoreboard_get_hole (sack_scoreboard_t * sb, u32 index)
748 if (index != TCP_INVALID_SACK_HOLE_INDEX)
749 return pool_elt_at_index (sb->holes, index);
753 always_inline sack_scoreboard_hole_t *
754 scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
756 if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
757 return pool_elt_at_index (sb->holes, hole->next);
761 always_inline sack_scoreboard_hole_t *
762 scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
764 if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
765 return pool_elt_at_index (sb->holes, hole->prev);
769 always_inline sack_scoreboard_hole_t *
770 scoreboard_first_hole (sack_scoreboard_t * sb)
772 if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
773 return pool_elt_at_index (sb->holes, sb->head);
777 always_inline sack_scoreboard_hole_t *
778 scoreboard_last_hole (sack_scoreboard_t * sb)
780 if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX)
781 return pool_elt_at_index (sb->holes, sb->tail);
786 scoreboard_clear (sack_scoreboard_t * sb)
788 sack_scoreboard_hole_t *hole;
789 while ((hole = scoreboard_first_hole (sb)))
791 scoreboard_remove_hole (sb, hole);
793 ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX);
794 ASSERT (pool_elts (sb->holes) == 0);
795 sb->sacked_bytes = 0;
796 sb->last_sacked_bytes = 0;
797 sb->last_bytes_delivered = 0;
802 sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
806 scoreboard_hole_bytes (sack_scoreboard_hole_t * hole)
808 return hole->end - hole->start;
812 scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
814 ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes));
815 return hole - sb->holes;
819 scoreboard_init (sack_scoreboard_t * sb)
821 sb->head = TCP_INVALID_SACK_HOLE_INDEX;
822 sb->tail = TCP_INVALID_SACK_HOLE_INDEX;
823 sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
826 void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
829 tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
830 const tcp_cc_algorithm_t * vft)
832 tcp_main_t *tm = vnet_get_tcp_main ();
833 vec_validate (tm->cc_algos, type);
835 tm->cc_algos[type] = *vft;
838 always_inline tcp_cc_algorithm_t *
839 tcp_cc_algo_get (tcp_cc_algorithm_type_e type)
841 tcp_main_t *tm = vnet_get_tcp_main ();
842 return &tm->cc_algos[type];
845 void tcp_cc_init (tcp_connection_t * tc);
848 * Push TCP header to buffer
850 * @param vm - vlib_main
851 * @param b - buffer to write the header to
852 * @param sp_net - source port net order
853 * @param dp_net - destination port net order
854 * @param seq - sequence number net order
855 * @param ack - ack number net order
856 * @param tcp_hdr_opts_len - header and options length in bytes
857 * @param flags - header flags
858 * @param wnd - window size
860 * @return - pointer to start of TCP header
863 vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq,
864 u32 ack, u8 tcp_hdr_opts_len, u8 flags,
869 th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
873 th->seq_number = seq;
874 th->ack_number = ack;
875 th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
879 th->urgent_pointer = 0;
884 * Push TCP header to buffer
886 * @param b - buffer to write the header to
887 * @param sp_net - source port net order
888 * @param dp_net - destination port net order
889 * @param seq - sequence number host order
890 * @param ack - ack number host order
891 * @param tcp_hdr_opts_len - header and options length in bytes
892 * @param flags - header flags
893 * @param wnd - window size
895 * @return - pointer to start of TCP header
898 vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
899 u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
901 return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
902 clib_host_to_net_u32 (seq),
903 clib_host_to_net_u32 (ack),
904 tcp_hdr_opts_len, flags,
905 clib_host_to_net_u16 (wnd));
908 #endif /* _vnet_tcp_h_ */
911 * fd.io coding-style-patch-verification: ON
914 * eval: (c-set-style "gnu")