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_IW_N_SEGMENTS 10
37 #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */
38 #define TCP_USE_SACKS 1 /**< Disable only for testing */
40 /** TCP FSM state definitions as per RFC793. */
41 #define foreach_tcp_fsm_state \
44 _(SYN_SENT, "SYN_SENT") \
45 _(SYN_RCVD, "SYN_RCVD") \
46 _(ESTABLISHED, "ESTABLISHED") \
47 _(CLOSE_WAIT, "CLOSE_WAIT") \
48 _(FIN_WAIT_1, "FIN_WAIT_1") \
49 _(LAST_ACK, "LAST_ACK") \
50 _(CLOSING, "CLOSING") \
51 _(FIN_WAIT_2, "FIN_WAIT_2") \
52 _(TIME_WAIT, "TIME_WAIT")
54 typedef enum _tcp_state
56 #define _(sym, str) TCP_STATE_##sym,
62 format_function_t format_tcp_state;
63 format_function_t format_tcp_flags;
64 format_function_t format_tcp_sacks;
67 #define foreach_tcp_timer \
68 _(RETRANSMIT, "RETRANSMIT") \
69 _(DELACK, "DELAYED ACK") \
70 _(PERSIST, "PERSIST") \
72 _(WAITCLOSE, "WAIT CLOSE") \
73 _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
74 _(ESTABLISH, "ESTABLISH")
76 typedef enum _tcp_timers
78 #define _(sym, str) TCP_TIMER_##sym,
84 typedef void (timer_expiration_handler) (u32 index);
86 extern timer_expiration_handler tcp_timer_delack_handler;
87 extern timer_expiration_handler tcp_timer_retransmit_handler;
88 extern timer_expiration_handler tcp_timer_persist_handler;
89 extern timer_expiration_handler tcp_timer_retransmit_syn_handler;
91 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
93 /* Timer delays as multiples of 100ms */
94 #define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP
95 * ticks to timer units */
96 #define TCP_DELACK_TIME 1 /* 0.1s */
97 #define TCP_ESTABLISH_TIME 750 /* 75s */
98 #define TCP_2MSL_TIME 300 /* 30s */
99 #define TCP_CLOSEWAIT_TIME 20 /* 0.1s */
100 #define TCP_CLEANUP_TIME 5 /* 0.5s Time to wait before cleanup */
101 #define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */
103 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
104 #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
105 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
106 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
107 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
109 /** TCP connection flags */
110 #define foreach_tcp_connection_flag \
111 _(SNDACK, "Send ACK") \
112 _(FINSNT, "FIN sent") \
113 _(SENT_RCV_WND0, "Sent 0 receive window") \
114 _(RECOVERY, "Recovery on") \
115 _(FAST_RECOVERY, "Fast Recovery on") \
116 _(FR_1_SMSS, "Sent 1 SMSS")
118 typedef enum _tcp_connection_flag_bits
120 #define _(sym, str) TCP_CONN_##sym##_BIT,
121 foreach_tcp_connection_flag
124 } tcp_connection_flag_bits_e;
126 typedef enum _tcp_connection_flag
128 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
129 foreach_tcp_connection_flag
132 } tcp_connection_flags_e;
134 /** TCP buffer flags */
135 #define foreach_tcp_buf_flag \
136 _ (ACK) /**< Sending ACK. */ \
137 _ (DUPACK) /**< Sending DUPACK. */ \
141 #define _(f) TCP_BUF_BIT_##f,
149 #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f,
154 #define TCP_MAX_SACK_BLOCKS 15 /**< Max number of SACK blocks stored */
155 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
157 typedef struct _sack_scoreboard_hole
159 u32 next; /**< Index for next entry in linked list */
160 u32 prev; /**< Index for previous entry in linked list */
161 u32 start; /**< Start sequence number */
162 u32 end; /**< End sequence number */
163 u8 is_lost; /**< Mark hole as lost */
164 } sack_scoreboard_hole_t;
166 typedef struct _sack_scoreboard
168 sack_scoreboard_hole_t *holes; /**< Pool of holes */
169 u32 head; /**< Index of first entry */
170 u32 tail; /**< Index of last entry */
171 u32 sacked_bytes; /**< Number of bytes sacked in sb */
172 u32 last_sacked_bytes; /**< Number of bytes last sacked */
173 u32 last_bytes_delivered; /**< Number of sack bytes delivered */
174 u32 snd_una_adv; /**< Bytes to add to snd_una */
175 u32 high_sacked; /**< Highest byte sacked (fack) */
176 u32 high_rxt; /**< Highest retransmitted sequence */
177 u32 rescue_rxt; /**< Rescue sequence number */
178 u32 lost_bytes; /**< Bytes lost as per RFC6675 */
179 u32 cur_rxt_hole; /**< Retransmitting from this hole */
182 typedef enum _tcp_cc_algorithm_type
185 } tcp_cc_algorithm_type_e;
187 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
189 typedef enum _tcp_cc_ack_t
196 typedef struct _tcp_connection
198 transport_connection_t connection; /**< Common transport data. First! */
200 u8 state; /**< TCP state as per tcp_state_t */
201 u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
202 u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
206 /** Send sequence variables RFC793 */
207 u32 snd_una; /**< oldest unacknowledged sequence number */
208 u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
209 u32 snd_wnd; /**< send window */
210 u32 snd_wl1; /**< seq number used for last snd.wnd update */
211 u32 snd_wl2; /**< ack number used for last snd.wnd update */
212 u32 snd_nxt; /**< next seq number to be sent */
213 u16 snd_mss; /**< Effective send max seg (data) size */
215 /** Receive sequence variables RFC793 */
216 u32 rcv_nxt; /**< next sequence number expected */
217 u32 rcv_wnd; /**< receive window we expect */
219 u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
220 u32 iss; /**< initial sent sequence */
221 u32 irs; /**< initial remote sequence */
224 tcp_options_t rcv_opts; /**< Rx options for connection */
225 tcp_options_t snd_opts; /**< Tx options for connection */
226 u8 snd_opts_len; /**< Tx options len */
227 u8 rcv_wscale; /**< Window scale to advertise to peer */
228 u8 snd_wscale; /**< Window scale to use when sending */
229 u32 tsval_recent; /**< Last timestamp received */
230 u32 tsval_recent_age; /**< When last updated tstamp_recent*/
232 sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
233 sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
235 u16 rcv_dupacks; /**< Number of DUPACKs received */
236 u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */
238 /* Congestion control */
239 u32 cwnd; /**< Congestion window */
240 u32 ssthresh; /**< Slow-start threshold */
241 u32 prev_ssthresh; /**< ssthresh before congestion */
242 u32 prev_cwnd; /**< ssthresh before congestion */
243 u32 bytes_acked; /**< Bytes acknowledged by current segment */
244 u32 snd_rxt_bytes; /**< Retransmitted bytes */
245 u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
246 u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
247 u32 snd_congestion; /**< snd_una_max when congestion is detected */
248 tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
251 u32 rto; /**< Retransmission timeout */
252 u32 rto_boff; /**< Index for RTO backoff */
253 u32 srtt; /**< Smoothed RTT */
254 u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
255 u32 rtt_ts; /**< Timestamp for tracked ACK */
256 u32 rtt_seq; /**< Sequence number for tracked ACK */
258 u16 mss; /**< Our max seg size that includes options */
259 u32 limited_transmit; /**< snd_nxt when limited transmit starts */
260 u32 last_fib_check; /**< Last time we checked fib route for peer */
263 struct _tcp_cc_algorithm
265 void (*rcv_ack) (tcp_connection_t * tc);
266 void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack);
267 void (*congestion) (tcp_connection_t * tc);
268 void (*recovered) (tcp_connection_t * tc);
269 void (*init) (tcp_connection_t * tc);
272 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
273 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
274 #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
275 #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
276 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
277 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
278 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
279 #define tcp_fastrecovery_sent_1_smss(tc) ((tc)->flags & TCP_CONN_FR_1_SMSS)
280 #define tcp_fastrecovery_1_smss_on(tc) ((tc)->flags |= TCP_CONN_FR_1_SMSS)
281 #define tcp_fastrecovery_1_smss_off(tc) ((tc)->flags &= ~TCP_CONN_FR_1_SMSS)
283 #define tcp_in_cong_recovery(tc) ((tc)->flags & \
284 (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
287 tcp_cong_recovery_off (tcp_connection_t * tc)
289 tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
290 tcp_fastrecovery_1_smss_off (tc);
300 typedef enum _tcp_error
302 #define tcp_error(n,s) TCP_ERROR_##n,
303 #include <vnet/tcp/tcp_error.def>
308 typedef struct _tcp_lookup_dispatch
311 } tcp_lookup_dispatch_t;
313 typedef struct _tcp_main
315 /* Per-worker thread tcp connection pools */
316 tcp_connection_t **connections;
318 /* Pool of listeners. */
319 tcp_connection_t *listener_pool;
321 /** Dispatch table by state and flags */
322 tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
324 u8 log2_tstamp_clocks_per_tick;
325 f64 tstamp_ticks_per_clock;
327 /** per-worker tx buffer free lists */
330 /* Per worker-thread timer wheel for connections timers */
331 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
333 // /* Convenience per worker-thread vector of connections to DELACK */
334 // u32 **delack_connections;
336 /* Pool of half-open connections on which we've sent a SYN */
337 tcp_connection_t *half_open_connections;
339 /* Pool of local TCP endpoints */
340 transport_endpoint_t *local_endpoints;
342 /* Local endpoints lookup table */
343 transport_endpoint_table_t local_endpoints_table;
345 /* Congestion control algorithms registered */
346 tcp_cc_algorithm_t *cc_algos;
348 /* Flag that indicates if stack is on or off */
352 vlib_main_t *vlib_main;
353 vnet_main_t *vnet_main;
354 ip4_main_t *ip4_main;
355 ip6_main_t *ip6_main;
358 extern tcp_main_t tcp_main;
359 extern vlib_node_registration_t tcp4_input_node;
360 extern vlib_node_registration_t tcp6_input_node;
361 extern vlib_node_registration_t tcp4_output_node;
362 extern vlib_node_registration_t tcp6_output_node;
364 always_inline tcp_main_t *
370 always_inline tcp_header_t *
371 tcp_buffer_hdr (vlib_buffer_t * b)
373 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
374 return (tcp_header_t *) (b->data + b->current_data
375 + vnet_buffer (b)->tcp.hdr_offset);
378 clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
380 always_inline tcp_connection_t *
381 tcp_connection_get (u32 conn_index, u32 thread_index)
383 if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
385 return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
388 always_inline tcp_connection_t *
389 tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
391 if (tcp_main.connections[thread_index] == 0)
393 if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
395 return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
398 void tcp_connection_close (tcp_connection_t * tc);
399 void tcp_connection_cleanup (tcp_connection_t * tc);
400 void tcp_connection_del (tcp_connection_t * tc);
401 void tcp_connection_reset (tcp_connection_t * tc);
403 u8 *format_tcp_connection_id (u8 * s, va_list * args);
404 u8 *format_tcp_connection (u8 * s, va_list * args);
405 u8 *format_tcp_scoreboard (u8 * s, va_list * args);
407 always_inline tcp_connection_t *
408 tcp_listener_get (u32 tli)
410 return pool_elt_at_index (tcp_main.listener_pool, tli);
413 always_inline tcp_connection_t *
414 tcp_half_open_connection_get (u32 conn_index)
416 return pool_elt_at_index (tcp_main.half_open_connections, conn_index);
419 void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b);
420 void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b);
421 void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b);
422 void tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4);
423 void tcp_send_syn (tcp_connection_t * tc);
424 void tcp_send_fin (tcp_connection_t * tc);
425 void tcp_init_mss (tcp_connection_t * tc);
426 void tcp_update_snd_mss (tcp_connection_t * tc);
427 void tcp_update_rto (tcp_connection_t * tc);
430 tcp_end_seq (tcp_header_t * th, u32 len)
432 return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
435 /* Modulo arithmetic for TCP sequence numbers */
436 #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
437 #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
438 #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
439 #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
440 #define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
442 /* Modulo arithmetic for timestamps */
443 #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
444 #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
447 * Our estimate of the number of bytes that have left the network
450 tcp_bytes_out (const tcp_connection_t * tc)
452 if (tcp_opts_sack_permitted (&tc->rcv_opts))
453 return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes;
455 return tc->rcv_dupacks * tc->snd_mss;
459 * Our estimate of the number of bytes in flight (pipe size)
462 tcp_flight_size (const tcp_connection_t * tc)
466 flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc)
473 ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d",
474 tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc),
475 tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes,
484 * Initial cwnd as per RFC5681
487 tcp_initial_cwnd (const tcp_connection_t * tc)
489 if (tc->snd_mss > 2190)
490 return 2 * tc->snd_mss;
491 else if (tc->snd_mss > 1095)
492 return 3 * tc->snd_mss;
494 return 4 * tc->snd_mss;
498 tcp_loss_wnd (const tcp_connection_t * tc)
504 tcp_available_wnd (const tcp_connection_t * tc)
506 return clib_min (tc->cwnd, tc->snd_wnd);
510 tcp_available_snd_space (const tcp_connection_t * tc)
512 u32 available_wnd = tcp_available_wnd (tc);
513 u32 flight_size = tcp_flight_size (tc);
515 if (available_wnd <= flight_size)
518 return available_wnd - flight_size;
521 i32 tcp_rcv_wnd_available (tcp_connection_t * tc);
522 u32 tcp_snd_space (tcp_connection_t * tc);
523 void tcp_update_rcv_wnd (tcp_connection_t * tc);
525 void tcp_retransmit_first_unacked (tcp_connection_t * tc);
526 void tcp_fast_retransmit_no_sack (tcp_connection_t * tc);
527 void tcp_fast_retransmit_sack (tcp_connection_t * tc);
528 void tcp_fast_retransmit (tcp_connection_t * tc);
529 void tcp_cc_init_congestion (tcp_connection_t * tc);
530 int tcp_cc_recover (tcp_connection_t * tc);
531 void tcp_cc_fastrecovery_exit (tcp_connection_t * tc);
533 fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
535 /* Made public for unit testing only */
536 void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
541 return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
545 tcp_update_time (f64 now, u32 thread_index)
547 tw_timer_expire_timers_16t_2w_512sl (&tcp_main.timer_wheels[thread_index],
551 u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
554 tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
555 u32 offset, u32 max_bytes);
557 void tcp_connection_timers_init (tcp_connection_t * tc);
558 void tcp_connection_timers_reset (tcp_connection_t * tc);
559 void tcp_connection_init_vars (tcp_connection_t * tc);
562 tcp_connection_force_ack (tcp_connection_t * tc, vlib_buffer_t * b)
564 /* Reset flags, make sure ack is sent */
565 tc->flags = TCP_CONN_SNDACK;
566 vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
570 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
573 = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
574 tc->c_c_index, timer_id, interval);
578 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
580 if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
583 tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
584 tc->timers[timer_id]);
585 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
589 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
591 if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
592 tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
593 tc->timers[timer_id]);
594 tc->timers[timer_id] =
595 tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
596 tc->c_c_index, timer_id, interval);
599 /* XXX Switch retransmit to faster TW */
601 tcp_retransmit_timer_set (tcp_connection_t * tc)
603 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
604 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
608 tcp_retransmit_timer_reset (tcp_connection_t * tc)
610 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
614 tcp_retransmit_timer_force_update (tcp_connection_t * tc)
616 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
617 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
621 tcp_persist_timer_set (tcp_connection_t * tc)
623 /* Reuse RTO. It's backed off in handler */
624 tcp_timer_set (tc, TCP_TIMER_PERSIST,
625 clib_max (tc->rto * TCP_TO_TIMER_TICK,
626 TCP_TIMER_PERSIST_MIN));
630 tcp_persist_timer_update (tcp_connection_t * tc)
632 tcp_timer_update (tc, TCP_TIMER_PERSIST,
633 clib_max (tc->rto * TCP_TO_TIMER_TICK,
634 TCP_TIMER_PERSIST_MIN));
638 tcp_persist_timer_reset (tcp_connection_t * tc)
640 tcp_timer_reset (tc, TCP_TIMER_PERSIST);
644 tcp_retransmit_timer_update (tcp_connection_t * tc)
646 if (tc->snd_una == tc->snd_una_max)
648 tcp_retransmit_timer_reset (tc);
649 if (tc->snd_wnd < tc->snd_mss)
650 tcp_persist_timer_set (tc);
653 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
654 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
658 tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
660 return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
663 #define tcp_validate_txf_size(_tc, _a) \
664 ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
665 || stream_session_tx_fifo_max_dequeue (&_tc->connection) >= _a)
668 scoreboard_remove_hole (sack_scoreboard_t * sb,
669 sack_scoreboard_hole_t * hole);
670 void scoreboard_update_lost (tcp_connection_t * tc, sack_scoreboard_t * sb);
671 sack_scoreboard_hole_t *scoreboard_insert_hole (sack_scoreboard_t * sb,
672 u32 prev_index, u32 start,
674 sack_scoreboard_hole_t *scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
675 sack_scoreboard_hole_t *
676 start, u8 have_sent_1_smss,
679 void scoreboard_init_high_rxt (sack_scoreboard_t * sb);
681 always_inline sack_scoreboard_hole_t *
682 scoreboard_get_hole (sack_scoreboard_t * sb, u32 index)
684 if (index != TCP_INVALID_SACK_HOLE_INDEX)
685 return pool_elt_at_index (sb->holes, index);
689 always_inline sack_scoreboard_hole_t *
690 scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
692 if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
693 return pool_elt_at_index (sb->holes, hole->next);
697 always_inline sack_scoreboard_hole_t *
698 scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
700 if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
701 return pool_elt_at_index (sb->holes, hole->prev);
705 always_inline sack_scoreboard_hole_t *
706 scoreboard_first_hole (sack_scoreboard_t * sb)
708 if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
709 return pool_elt_at_index (sb->holes, sb->head);
713 always_inline sack_scoreboard_hole_t *
714 scoreboard_last_hole (sack_scoreboard_t * sb)
716 if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX)
717 return pool_elt_at_index (sb->holes, sb->tail);
722 scoreboard_clear (sack_scoreboard_t * sb)
724 sack_scoreboard_hole_t *hole;
725 while ((hole = scoreboard_first_hole (sb)))
727 scoreboard_remove_hole (sb, hole);
729 ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX);
730 sb->sacked_bytes = 0;
731 sb->last_sacked_bytes = 0;
732 sb->last_bytes_delivered = 0;
737 sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
741 scoreboard_hole_bytes (sack_scoreboard_hole_t * hole)
743 return hole->end - hole->start;
747 scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
749 return hole - sb->holes;
753 scoreboard_init (sack_scoreboard_t * sb)
755 sb->head = TCP_INVALID_SACK_HOLE_INDEX;
756 sb->tail = TCP_INVALID_SACK_HOLE_INDEX;
757 sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
760 void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
763 tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
764 const tcp_cc_algorithm_t * vft)
766 tcp_main_t *tm = vnet_get_tcp_main ();
767 vec_validate (tm->cc_algos, type);
769 tm->cc_algos[type] = *vft;
772 always_inline tcp_cc_algorithm_t *
773 tcp_cc_algo_get (tcp_cc_algorithm_type_e type)
775 tcp_main_t *tm = vnet_get_tcp_main ();
776 return &tm->cc_algos[type];
779 void tcp_cc_init (tcp_connection_t * tc);
782 * Push TCP header to buffer
784 * @param vm - vlib_main
785 * @param b - buffer to write the header to
786 * @param sp_net - source port net order
787 * @param dp_net - destination port net order
788 * @param seq - sequence number net order
789 * @param ack - ack number net order
790 * @param tcp_hdr_opts_len - header and options length in bytes
791 * @param flags - header flags
792 * @param wnd - window size
794 * @return - pointer to start of TCP header
797 vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq,
798 u32 ack, u8 tcp_hdr_opts_len, u8 flags,
803 th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
807 th->seq_number = seq;
808 th->ack_number = ack;
809 th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
813 th->urgent_pointer = 0;
818 * Push TCP header to buffer
820 * @param b - buffer to write the header to
821 * @param sp_net - source port net order
822 * @param dp_net - destination port net order
823 * @param seq - sequence number host order
824 * @param ack - ack number host order
825 * @param tcp_hdr_opts_len - header and options length in bytes
826 * @param flags - header flags
827 * @param wnd - window size
829 * @return - pointer to start of TCP header
832 vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
833 u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
835 return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
836 clib_host_to_net_u32 (seq),
837 clib_host_to_net_u32 (ack),
838 tcp_hdr_opts_len, flags,
839 clib_host_to_net_u16 (wnd));
842 #endif /* _vnet_tcp_h_ */
845 * fd.io coding-style-patch-verification: ON
848 * eval: (c-set-style "gnu")