FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
tcp.h
Go to the documentation of this file.
1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 
16 #ifndef _vnet_tcp_h_
17 #define _vnet_tcp_h_
18 
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>
26 
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
33 
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 */
40 
41 /** TCP FSM state definitions as per RFC793. */
42 #define foreach_tcp_fsm_state \
43  _(CLOSED, "CLOSED") \
44  _(LISTEN, "LISTEN") \
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")
54 
55 typedef enum _tcp_state
56 {
57 #define _(sym, str) TCP_STATE_##sym,
59 #undef _
61 } tcp_state_t;
62 
67 
68 /** TCP timers */
69 #define foreach_tcp_timer \
70  _(RETRANSMIT, "RETRANSMIT") \
71  _(DELACK, "DELAYED ACK") \
72  _(PERSIST, "PERSIST") \
73  _(KEEP, "KEEP") \
74  _(WAITCLOSE, "WAIT CLOSE") \
75  _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
76  _(ESTABLISH, "ESTABLISH")
77 
78 typedef enum _tcp_timers
79 {
80 #define _(sym, str) TCP_TIMER_##sym,
82 #undef _
84 } tcp_timers_e;
85 
86 typedef void (timer_expiration_handler) (u32 index);
87 
92 
93 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
94 
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_SYN_RCVD_TIME 600 /* 60s */
101 #define TCP_2MSL_TIME 300 /* 30s */
102 #define TCP_CLOSEWAIT_TIME 20 /* 2s */
103 #define TCP_TIMEWAIT_TIME 100 /* 10s */
104 #define TCP_CLEANUP_TIME 10 /* 1s Time to wait before cleanup */
105 #define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */
106 
107 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
108 #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
109 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
110 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
111 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
112 
113 /** TCP connection flags */
114 #define foreach_tcp_connection_flag \
115  _(SNDACK, "Send ACK") \
116  _(FINSNT, "FIN sent") \
117  _(SENT_RCV_WND0, "Sent 0 rcv_wnd") \
118  _(RECOVERY, "Recovery") \
119  _(FAST_RECOVERY, "Fast Recovery") \
120  _(FR_1_SMSS, "Sent 1 SMSS") \
121  _(HALF_OPEN_DONE, "Half-open completed") \
122  _(FINPNDG, "FIN pending")
123 
124 typedef enum _tcp_connection_flag_bits
125 {
126 #define _(sym, str) TCP_CONN_##sym##_BIT,
128 #undef _
131 
132 typedef enum _tcp_connection_flag
133 {
134 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
136 #undef _
139 
140 /** TCP buffer flags */
141 #define foreach_tcp_buf_flag \
142  _ (ACK) /**< Sending ACK. */ \
143  _ (DUPACK) /**< Sending DUPACK. */ \
144 
145 enum
146 {
147 #define _(f) TCP_BUF_BIT_##f,
149 #undef _
151 };
152 
153 enum
154 {
155 #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f,
157 #undef _
158 };
159 
160 #define TCP_SCOREBOARD_TRACE (0)
161 #define TCP_MAX_SACK_BLOCKS 15 /**< Max number of SACK blocks stored */
162 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
164 typedef struct _scoreboard_trace_elt
165 {
166  u32 start;
167  u32 end;
168  u32 ack;
169  u32 snd_una_max;
170  u32 group;
172 
173 typedef struct _sack_scoreboard_hole
174 {
175  u32 next; /**< Index for next entry in linked list */
176  u32 prev; /**< Index for previous entry in linked list */
177  u32 start; /**< Start sequence number */
178  u32 end; /**< End sequence number */
179  u8 is_lost; /**< Mark hole as lost */
181 
182 typedef struct _sack_scoreboard
183 {
184  sack_scoreboard_hole_t *holes; /**< Pool of holes */
185  u32 head; /**< Index of first entry */
186  u32 tail; /**< Index of last entry */
187  u32 sacked_bytes; /**< Number of bytes sacked in sb */
188  u32 last_sacked_bytes; /**< Number of bytes last sacked */
189  u32 last_bytes_delivered; /**< Number of sack bytes delivered */
190  u32 snd_una_adv; /**< Bytes to add to snd_una */
191  u32 high_sacked; /**< Highest byte sacked (fack) */
192  u32 high_rxt; /**< Highest retransmitted sequence */
193  u32 rescue_rxt; /**< Rescue sequence number */
194  u32 lost_bytes; /**< Bytes lost as per RFC6675 */
195  u32 cur_rxt_hole; /**< Retransmitting from this hole */
196 
197 #if TCP_SCOREBOARD_TRACE
199 #endif
200 
202 
203 #if TCP_SCOREBOARD_TRACE
204 #define tcp_scoreboard_trace_add(_tc, _ack) \
205 { \
206  static u64 _group = 0; \
207  sack_scoreboard_t *_sb = &_tc->sack_sb; \
208  sack_block_t *_sack, *_sacks; \
209  scoreboard_trace_elt_t *_elt; \
210  int i; \
211  _group++; \
212  _sacks = _tc->rcv_opts.sacks; \
213  for (i = 0; i < vec_len (_sacks); i++) \
214  { \
215  _sack = &_sacks[i]; \
216  vec_add2 (_sb->trace, _elt, 1); \
217  _elt->start = _sack->start; \
218  _elt->end = _sack->end; \
219  _elt->ack = _elt->end == _ack ? _ack : 0; \
220  _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \
221  _elt->group = _group; \
222  } \
223 }
224 #else
225 #define tcp_scoreboard_trace_add(_tc, _ack)
226 #endif
227 
228 typedef enum _tcp_cc_algorithm_type
229 {
232 
233 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
235 typedef enum _tcp_cc_ack_t
236 {
237  TCP_CC_ACK,
241 
242 typedef struct _tcp_connection
243 {
244  transport_connection_t connection; /**< Common transport data. First! */
245 
246  u8 state; /**< TCP state as per tcp_state_t */
247  u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
248  u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
249 
250  /* TODO RFC4898 */
251 
252  /** Send sequence variables RFC793 */
253  u32 snd_una; /**< oldest unacknowledged sequence number */
254  u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
255  u32 snd_wnd; /**< send window */
256  u32 snd_wl1; /**< seq number used for last snd.wnd update */
257  u32 snd_wl2; /**< ack number used for last snd.wnd update */
258  u32 snd_nxt; /**< next seq number to be sent */
259  u16 snd_mss; /**< Effective send max seg (data) size */
260 
261  /** Receive sequence variables RFC793 */
262  u32 rcv_nxt; /**< next sequence number expected */
263  u32 rcv_wnd; /**< receive window we expect */
264 
265  u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
266  u32 iss; /**< initial sent sequence */
267  u32 irs; /**< initial remote sequence */
268 
269  /* Options */
270  tcp_options_t rcv_opts; /**< Rx options for connection */
271  tcp_options_t snd_opts; /**< Tx options for connection */
272  u8 snd_opts_len; /**< Tx options len */
273  u8 rcv_wscale; /**< Window scale to advertise to peer */
274  u8 snd_wscale; /**< Window scale to use when sending */
275  u32 tsval_recent; /**< Last timestamp received */
276  u32 tsval_recent_age; /**< When last updated tstamp_recent*/
277 
278  sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
279  sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
280 
281  u16 rcv_dupacks; /**< Number of DUPACKs received */
282  u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */
283 
284  /* Congestion control */
285  u32 cwnd; /**< Congestion window */
286  u32 ssthresh; /**< Slow-start threshold */
287  u32 prev_ssthresh; /**< ssthresh before congestion */
288  u32 prev_cwnd; /**< ssthresh before congestion */
289  u32 bytes_acked; /**< Bytes acknowledged by current segment */
290  u32 snd_rxt_bytes; /**< Retransmitted bytes */
291  u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
292  u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
293  u32 snd_congestion; /**< snd_una_max when congestion is detected */
294  tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
295 
296  /* RTT and RTO */
297  u32 rto; /**< Retransmission timeout */
298  u32 rto_boff; /**< Index for RTO backoff */
299  u32 srtt; /**< Smoothed RTT */
300  u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
301  u32 rtt_ts; /**< Timestamp for tracked ACK */
302  u32 rtt_seq; /**< Sequence number for tracked ACK */
303 
304  u16 mss; /**< Our max seg size that includes options */
305  u32 limited_transmit; /**< snd_nxt when limited transmit starts */
306  u32 last_fib_check; /**< Last time we checked fib route for peer */
308 
309 struct _tcp_cc_algorithm
310 {
311  void (*rcv_ack) (tcp_connection_t * tc);
312  void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack);
313  void (*congestion) (tcp_connection_t * tc);
314  void (*recovered) (tcp_connection_t * tc);
315  void (*init) (tcp_connection_t * tc);
316 };
317 
318 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
319 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
320 #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
321 #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
322 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
323 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
324 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
325 #define tcp_fastrecovery_sent_1_smss(tc) ((tc)->flags & TCP_CONN_FR_1_SMSS)
326 #define tcp_fastrecovery_1_smss_on(tc) ((tc)->flags |= TCP_CONN_FR_1_SMSS)
327 #define tcp_fastrecovery_1_smss_off(tc) ((tc)->flags &= ~TCP_CONN_FR_1_SMSS)
329 #define tcp_in_cong_recovery(tc) ((tc)->flags & \
330  (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
331 
332 always_inline void
334 {
335  tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
337 }
338 
339 typedef enum
340 {
341  TCP_IP4,
345 
346 typedef enum _tcp_error
347 {
348 #define tcp_error(n,s) TCP_ERROR_##n,
350 #undef tcp_error
351  TCP_N_ERROR,
353 
354 typedef struct _tcp_lookup_dispatch
355 {
356  u8 next, error;
358 
359 typedef struct _tcp_main
360 {
361  /* Per-worker thread tcp connection pools */
362  tcp_connection_t **connections;
363 
364  /* Pool of listeners. */
365  tcp_connection_t *listener_pool;
366 
367  /** Dispatch table by state and flags */
368  tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
369 
370  u8 log2_tstamp_clocks_per_tick;
371  f64 tstamp_ticks_per_clock;
372  u32 *time_now;
373 
374  /** per-worker tx buffer free lists */
375  u32 **tx_buffers;
376  /** per-worker tx frames to tcp 4/6 output nodes */
377  vlib_frame_t **tx_frames[2];
378  /** per-worker tx frames to ip 4/6 lookup nodes */
379  vlib_frame_t **ip_lookup_tx_frames[2];
380 
381  /* Per worker-thread timer wheel for connections timers */
382  tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
383 
384  /* Pool of half-open connections on which we've sent a SYN */
385  tcp_connection_t *half_open_connections;
386  clib_spinlock_t half_open_lock;
387 
388  /* Congestion control algorithms registered */
389  tcp_cc_algorithm_t *cc_algos;
390 
391  /* Flag that indicates if stack is on or off */
392  u8 is_enabled;
393 
394  /** Number of preallocated connections */
395  u32 preallocated_connections;
396  u32 preallocated_half_open_connections;
397 
398  /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
399  ip4_address_t *ip4_src_addresses;
400  u32 last_v4_address_rotor;
401  u32 last_v6_address_rotor;
402  ip6_address_t *ip6_src_addresses;
403 
404  /** vlib buffer size */
405  u32 bytes_per_buffer;
406 
407  u8 punt_unknown4;
408  u8 punt_unknown6;
409 
410  /** fault-injection */
411  f64 buffer_fail_fraction;
412 } tcp_main_t;
413 
414 extern tcp_main_t tcp_main;
419 
422 {
423  return &tcp_main;
424 }
425 
428 {
429  ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
430  return (tcp_header_t *) (b->data + b->current_data
431  + vnet_buffer (b)->tcp.hdr_offset);
432 }
433 
434 #if (VLIB_BUFFER_TRACE_TRAJECTORY)
435 #define tcp_trajectory_add_start(b, start) \
436 { \
437  (*vlib_buffer_trace_trajectory_cb) (b, start); \
438 }
439 #else
440 #define tcp_trajectory_add_start(b, start)
441 #endif
442 
444 
445 void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
446 
448 tcp_connection_get (u32 conn_index, u32 thread_index)
449 {
450  if (PREDICT_FALSE
451  (pool_is_free_index (tcp_main.connections[thread_index], conn_index)))
452  return 0;
453  return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
454 }
455 
457 tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
458 {
459  if (tcp_main.connections[thread_index] == 0)
460  return 0;
461  if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
462  return 0;
463  return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
464 }
465 
468 {
469  return (tcp_connection_t *) tconn;
470 }
471 
476 tcp_connection_t *tcp_connection_new (u8 thread_index);
479  ip4_address_t * start,
480  ip4_address_t * end, u32 table_id);
482  ip6_address_t * start,
483  ip6_address_t * end, u32 table_id);
484 void tcp_api_reference (void);
485 u8 *format_tcp_connection_id (u8 * s, va_list * args);
486 u8 *format_tcp_connection (u8 * s, va_list * args);
487 u8 *format_tcp_scoreboard (u8 * s, va_list * args);
488 
489 u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose);
490 
492 tcp_listener_get (u32 tli)
493 {
494  return pool_elt_at_index (tcp_main.listener_pool, tli);
495 }
496 
499 {
500  tcp_connection_t *tc = 0;
501  clib_spinlock_lock_if_init (&tcp_main.half_open_lock);
502  if (!pool_is_free_index (tcp_main.half_open_connections, conn_index))
503  tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index);
504  clib_spinlock_unlock_if_init (&tcp_main.half_open_lock);
505  return tc;
506 }
507 
512  u8 is_ip4);
513 void tcp_send_reset (tcp_connection_t * tc);
514 void tcp_send_syn (tcp_connection_t * tc);
515 void tcp_send_fin (tcp_connection_t * tc);
516 void tcp_init_mss (tcp_connection_t * tc);
518 void tcp_update_rto (tcp_connection_t * tc);
519 void tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4);
520 void tcp_flush_frames_to_output (u8 thread_index);
521 
523 tcp_end_seq (tcp_header_t * th, u32 len)
524 {
525  return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
526 }
527 
528 /* Modulo arithmetic for TCP sequence numbers */
529 #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
530 #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
531 #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
532 #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
533 #define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
535 /* Modulo arithmetic for timestamps */
536 #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
537 #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
539 /**
540  * Our estimate of the number of bytes that have left the network
541  */
543 tcp_bytes_out (const tcp_connection_t * tc)
544 {
545  if (tcp_opts_sack_permitted (&tc->rcv_opts))
546  return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes;
547  else
548  return tc->rcv_dupacks * tc->snd_mss;
549 }
550 
551 /**
552  * Our estimate of the number of bytes in flight (pipe size)
553  */
556 {
557  int flight_size;
558 
559  flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc)
560  + tc->snd_rxt_bytes;
561 
562  if (flight_size < 0)
563  {
564  if (0)
566  ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d",
567  tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc),
568  tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes,
569  tc->rcv_opts.flags);
570  return 0;
571  }
572 
573  return flight_size;
574 }
575 
576 /**
577  * Initial cwnd as per RFC5681
578  */
581 {
582  if (tc->snd_mss > 2190)
583  return 2 * tc->snd_mss;
584  else if (tc->snd_mss > 1095)
585  return 3 * tc->snd_mss;
586  else
587  return 4 * tc->snd_mss;
588 }
589 
591 tcp_loss_wnd (const tcp_connection_t * tc)
592 {
593  return tc->snd_mss;
594 }
595 
598 {
599  return clib_min (tc->cwnd, tc->snd_wnd);
600 }
601 
604 {
605  u32 available_wnd = tcp_available_snd_wnd (tc);
606  int flight_size = (int) (tc->snd_nxt - tc->snd_una);
607 
608  if (available_wnd <= flight_size)
609  return 0;
610 
611  return available_wnd - flight_size;
612 }
613 
614 /**
615  * Estimate of how many bytes we can still push into the network
616  */
619 {
620  u32 available_wnd = tcp_available_snd_wnd (tc);
621  u32 flight_size = tcp_flight_size (tc);
622 
623  if (available_wnd <= flight_size)
624  return 0;
625 
626  return available_wnd - flight_size;
627 }
628 
631 {
632  if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1)
633  return 1;
634  return 0;
635 }
636 
640 
648 
650 
651 /* Made public for unit testing only */
652 void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
653 
655 tcp_time_now (void)
656 {
657  return tcp_main.time_now[vlib_get_thread_index ()];
658 }
659 
661 tcp_set_time_now (u32 thread_index)
662 {
663  tcp_main.time_now[thread_index] = clib_cpu_time_now ()
664  * tcp_main.tstamp_ticks_per_clock;
665  return tcp_main.time_now[thread_index];
666 }
667 
669 
670 u32
672  u32 max_bytes, vlib_buffer_t ** b);
673 
678 
679 always_inline void
681 {
682  /* Reset flags, make sure ack is sent */
683  tc->flags = TCP_CONN_SNDACK;
684  vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
685 }
686 
687 always_inline void
688 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
689 {
690  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
691  ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID);
692  tc->timers[timer_id]
693  = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
694  tc->c_c_index, timer_id, interval);
695 }
696 
697 always_inline void
698 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
699 {
700  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
701  if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
702  return;
703 
704  tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
705  tc->timers[timer_id]);
706  tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
707 }
708 
709 always_inline void
710 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
711 {
712  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
713  if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
714  tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
715  tc->timers[timer_id]);
716  tc->timers[timer_id] =
717  tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
718  tc->c_c_index, timer_id, interval);
719 }
720 
721 always_inline void
723 {
724  ASSERT (tc->snd_una != tc->snd_una_max);
725  tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
726  clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
727 }
728 
729 always_inline void
731 {
732  tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
733 }
734 
735 always_inline void
737 {
738  tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
739  clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
740 }
741 
742 always_inline void
744 {
745  /* Reuse RTO. It's backed off in handler */
746  tcp_timer_set (tc, TCP_TIMER_PERSIST,
747  clib_max (tc->rto * TCP_TO_TIMER_TICK,
749 }
750 
751 always_inline void
753 {
754  tcp_timer_update (tc, TCP_TIMER_PERSIST,
755  clib_max (tc->rto * TCP_TO_TIMER_TICK,
757 }
758 
759 always_inline void
761 {
762  tcp_timer_reset (tc, TCP_TIMER_PERSIST);
763 }
764 
765 always_inline void
767 {
768  if (tc->snd_una == tc->snd_una_max)
769  {
771  if (tc->snd_wnd < tc->snd_mss)
773  }
774  else
775  tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
776  clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
777 }
778 
781 {
782  return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
783 }
784 
785 #define tcp_validate_txf_size(_tc, _a) \
786  ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
787  || stream_session_tx_fifo_max_dequeue (&_tc->connection) >= _a)
788 
789 void
791  sack_scoreboard_hole_t * hole);
794  u32 prev_index, u32 start,
795  u32 end);
798  start, u8 have_sent_1_smss,
799  u8 * can_rescue,
800  u8 * snd_limited);
802 
805 {
806  if (index != TCP_INVALID_SACK_HOLE_INDEX)
807  return pool_elt_at_index (sb->holes, index);
808  return 0;
809 }
810 
813 {
814  if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
815  return pool_elt_at_index (sb->holes, hole->next);
816  return 0;
817 }
818 
821 {
822  if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
823  return pool_elt_at_index (sb->holes, hole->prev);
824  return 0;
825 }
826 
829 {
830  if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
831  return pool_elt_at_index (sb->holes, sb->head);
832  return 0;
833 }
834 
837 {
838  if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX)
839  return pool_elt_at_index (sb->holes, sb->tail);
840  return 0;
841 }
842 
843 always_inline void
845 {
847  while ((hole = scoreboard_first_hole (sb)))
848  {
849  scoreboard_remove_hole (sb, hole);
850  }
851  ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX);
852  ASSERT (pool_elts (sb->holes) == 0);
853  sb->sacked_bytes = 0;
854  sb->last_sacked_bytes = 0;
855  sb->last_bytes_delivered = 0;
856  sb->snd_una_adv = 0;
857  sb->high_sacked = 0;
858  sb->high_rxt = 0;
859  sb->lost_bytes = 0;
860  sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
861 }
862 
865 {
866  return hole->end - hole->start;
867 }
868 
871 {
872  ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes));
873  return hole - sb->holes;
874 }
875 
876 always_inline void
878 {
879  sb->head = TCP_INVALID_SACK_HOLE_INDEX;
880  sb->tail = TCP_INVALID_SACK_HOLE_INDEX;
881  sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
882 }
883 
884 void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
885 
886 always_inline void
888  const tcp_cc_algorithm_t * vft)
889 {
890  tcp_main_t *tm = vnet_get_tcp_main ();
891  vec_validate (tm->cc_algos, type);
892 
893  tm->cc_algos[type] = *vft;
894 }
895 
898 {
899  tcp_main_t *tm = vnet_get_tcp_main ();
900  return &tm->cc_algos[type];
901 }
902 
903 void tcp_cc_init (tcp_connection_t * tc);
904 
905 /**
906  * Push TCP header to buffer
907  *
908  * @param vm - vlib_main
909  * @param b - buffer to write the header to
910  * @param sp_net - source port net order
911  * @param dp_net - destination port net order
912  * @param seq - sequence number net order
913  * @param ack - ack number net order
914  * @param tcp_hdr_opts_len - header and options length in bytes
915  * @param flags - header flags
916  * @param wnd - window size
917  *
918  * @return - pointer to start of TCP header
919  */
920 always_inline void *
922  u32 ack, u8 tcp_hdr_opts_len, u8 flags,
923  u16 wnd)
924 {
925  tcp_header_t *th;
926 
927  th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
928 
929  th->src_port = sp;
930  th->dst_port = dp;
931  th->seq_number = seq;
932  th->ack_number = ack;
933  th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
934  th->flags = flags;
935  th->window = wnd;
936  th->checksum = 0;
937  th->urgent_pointer = 0;
938  return th;
939 }
940 
941 /**
942  * Push TCP header to buffer
943  *
944  * @param b - buffer to write the header to
945  * @param sp_net - source port net order
946  * @param dp_net - destination port net order
947  * @param seq - sequence number host order
948  * @param ack - ack number host order
949  * @param tcp_hdr_opts_len - header and options length in bytes
950  * @param flags - header flags
951  * @param wnd - window size
952  *
953  * @return - pointer to start of TCP header
954  */
955 always_inline void *
956 vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
957  u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
958 {
959  return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
960  clib_host_to_net_u32 (seq),
961  clib_host_to_net_u32 (ack),
962  tcp_hdr_opts_len, flags,
963  clib_host_to_net_u16 (wnd));
964 }
965 
966 #endif /* _vnet_tcp_h_ */
967 
968 /*
969  * fd.io coding-style-patch-verification: ON
970  *
971  * Local Variables:
972  * eval: (c-set-style "gnu")
973  * End:
974  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:432
tcp_main_t tcp_main
Definition: tcp.c:29
#define tcp_fastrecovery_1_smss_off(tc)
Definition: tcp.h:328
#define clib_min(x, y)
Definition: clib.h:340
u32 tcp_prepare_retransmit_segment(tcp_connection_t *tc, u32 offset, u32 max_bytes, vlib_buffer_t **b)
Build a retransmit segment.
Definition: tcp_output.c:1194
static void tcp_retransmit_timer_set(tcp_connection_t *tc)
Definition: tcp.h:723
void tcp_make_fin(tcp_connection_t *tc, vlib_buffer_t *b)
Convert buffer to FIN-ACK.
Definition: tcp_output.c:559
struct _sack_block sack_block_t
void tcp_cc_init_congestion(tcp_connection_t *tc)
Definition: tcp_input.c:929
struct _scoreboard_trace_elt scoreboard_trace_elt_t
void tcp_connection_timers_reset(tcp_connection_t *tc)
Stop all connection timers.
Definition: tcp.c:354
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: memory_vlib.c:1679
struct _transport_connection transport_connection_t
#define TCP_TO_TIMER_TICK
Definition: tcp.h:96
vlib_node_registration_t tcp4_output_node
(constructor) VLIB_REGISTER_NODE (tcp4_output_node)
Definition: tcp_output.c:1920
tcp_connection_t * tcp_connection_new(u8 thread_index)
Definition: tcp.c:204
void tcp_fast_retransmit(tcp_connection_t *tc)
Do fast retransmit.
Definition: tcp_output.c:1730
static u32 tcp_bytes_out(const tcp_connection_t *tc)
Our estimate of the number of bytes that have left the network.
Definition: tcp.h:544
sack_scoreboard_hole_t * scoreboard_insert_hole(sack_scoreboard_t *sb, u32 prev_index, u32 start, u32 end)
Definition: tcp_input.c:561
static tcp_connection_t * tcp_connection_get_if_valid(u32 conn_index, u32 thread_index)
Definition: tcp.h:458
void tcp_connection_del(tcp_connection_t *tc)
Connection removal.
Definition: tcp.c:196
struct _sack_scoreboard sack_scoreboard_t
void tcp_update_sack_list(tcp_connection_t *tc, u32 start, u32 end)
Build SACK list as per RFC2018.
Definition: tcp_input.c:1327
u32 tcp_snd_space(tcp_connection_t *tc)
Compute tx window session is allowed to fill.
Definition: tcp.c:939
static tcp_connection_t * tcp_half_open_connection_get(u32 conn_index)
Definition: tcp.h:499
#define VLIB_BUFFER_PRE_DATA_SIZE
Definition: buffer.h:52
static_always_inline void clib_spinlock_unlock_if_init(clib_spinlock_t *p)
Definition: lock.h:85
void scoreboard_update_lost(tcp_connection_t *tc, sack_scoreboard_t *sb)
struct _tcp_main tcp_main_t
vlib_node_registration_t tcp6_output_node
(constructor) VLIB_REGISTER_NODE (tcp6_output_node)
Definition: tcp_output.c:1941
static u64 clib_cpu_time_now(void)
Definition: time.h:73
timer_expiration_handler tcp_timer_retransmit_handler
static void scoreboard_init(sack_scoreboard_t *sb)
Definition: tcp.h:878
u8 * format_tcp_scoreboard(u8 *s, va_list *args)
Definition: tcp.c:852
struct _vlib_node_registration vlib_node_registration_t
static sack_scoreboard_hole_t * scoreboard_prev_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp.h:821
struct _tcp_lookup_dispatch tcp_lookup_dispatch_t
struct _tcp_connection tcp_connection_t
static u32 tcp_available_snd_wnd(const tcp_connection_t *tc)
Definition: tcp.h:598
void tcp_fast_retransmit_sack(tcp_connection_t *tc)
Do fast retransmit with SACKs.
Definition: tcp_output.c:1616
static tcp_connection_t * tcp_get_connection_from_transport(transport_connection_t *tconn)
Definition: tcp.h:468
void tcp_connection_cleanup(tcp_connection_t *tc)
Cleans up connection state.
Definition: tcp.c:158
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
static void scoreboard_clear(sack_scoreboard_t *sb)
Definition: tcp.h:845
void tcp_send_reset_w_pkt(tcp_connection_t *tc, vlib_buffer_t *pkt, u8 is_ip4)
Send reset without reusing existing buffer.
Definition: tcp_output.c:814
format_function_t format_tcp_flags
Definition: tcp.h:64
struct _tcp_header tcp_header_t
static u32 tcp_available_snd_space(const tcp_connection_t *tc)
Estimate of how many bytes we can still push into the network.
Definition: tcp.h:619
void tcp_connection_reset(tcp_connection_t *tc)
Notify session that connection has been reset.
Definition: tcp.c:221
struct _sack_scoreboard_hole sack_scoreboard_hole_t
void tcp_flush_frame_to_output(vlib_main_t *vm, u8 thread_index, u8 is_ip4)
Flush tx frame populated by retransmits and timer pops.
Definition: tcp_output.c:1002
u8 * tcp_scoreboard_replay(u8 *s, tcp_connection_t *tc, u8 verbose)
Definition: tcp.c:1662
static u32 scoreboard_hole_index(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp.h:871
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:68
#define tcp_is_fin(_th)
Definition: tcp_packet.h:90
i32 tcp_rcv_wnd_available(tcp_connection_t *tc)
Definition: tcp.c:996
#define always_inline
Definition: clib.h:92
static u32 tcp_available_output_snd_space(const tcp_connection_t *tc)
Definition: tcp.h:604
static tcp_header_t * tcp_buffer_hdr(vlib_buffer_t *b)
Definition: tcp.h:428
int i32
Definition: types.h:81
static timer_callback_t * timers
Definition: timer.c:57
enum _tcp_state tcp_state_t
void scoreboard_init_high_rxt(sack_scoreboard_t *sb, u32 seq)
Definition: tcp_input.c:697
timer_expiration_handler tcp_timer_retransmit_syn_handler
static u32 tcp_time_now(void)
Definition: tcp.h:656
static tcp_cc_algorithm_t * tcp_cc_algo_get(tcp_cc_algorithm_type_e type)
Definition: tcp.h:898
static u32 scoreboard_hole_bytes(sack_scoreboard_hole_t *hole)
Definition: tcp.h:865
sack_scoreboard_hole_t * scoreboard_next_rxt_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *start, u8 have_sent_1_smss, u8 *can_rescue, u8 *snd_limited)
Figure out the next hole to retransmit.
Definition: tcp_input.c:642
void tcp_api_reference(void)
Definition: tcp_api.c:109
static void tcp_timer_set(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:689
Definition: tcp.h:344
#define TCP_INVALID_SACK_HOLE_INDEX
Definition: tcp.h:163
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:459
timer_expiration_handler tcp_timer_persist_handler
static void * vlib_buffer_push_tcp_net_order(vlib_buffer_t *b, u16 sp, u16 dp, u32 seq, u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
Push TCP header to buffer.
Definition: tcp.h:922
void tcp_retransmit_first_unacked(tcp_connection_t *tc)
Retransmit first unacked segment.
Definition: tcp_output.c:1593
void tcp_rcv_sacks(tcp_connection_t *tc, u32 ack)
Definition: tcp_input.c:724
clib_error_t * vnet_tcp_enable_disable(vlib_main_t *vm, u8 is_en)
Definition: tcp.c:1253
void tcp_send_syn(tcp_connection_t *tc)
Send SYN.
Definition: tcp_output.c:966
static sack_scoreboard_hole_t * scoreboard_next_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp.h:813
#define TCP_TIMER_HANDLE_INVALID
Definition: tcp.h:93
void tcp_fast_retransmit_no_sack(tcp_connection_t *tc)
Fast retransmit without SACK info.
Definition: tcp_output.c:1693
static u32 tcp_flight_size(const tcp_connection_t *tc)
Our estimate of the number of bytes in flight (pipe size)
Definition: tcp.h:556
#define PREDICT_FALSE(x)
Definition: clib.h:105
u32 tcp_push_header(transport_connection_t *tconn, vlib_buffer_t *b)
Definition: tcp_output.c:1963
void( timer_expiration_handler)(u32 index)
Definition: tcp.h:86
static sack_scoreboard_hole_t * scoreboard_last_hole(sack_scoreboard_t *sb)
Definition: tcp.h:837
enum _tcp_cc_ack_t tcp_cc_ack_t
static void tcp_timer_reset(tcp_connection_t *tc, u8 timer_id)
Definition: tcp.h:699
static sack_scoreboard_hole_t * scoreboard_first_hole(sack_scoreboard_t *sb)
Definition: tcp.h:829
enum _tcp_error tcp_error_t
static void * vlib_buffer_push_tcp(vlib_buffer_t *b, u16 sp_net, u16 dp_net, u32 seq, u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
Push TCP header to buffer.
Definition: tcp.h:957
int tcp_configure_v4_source_address_range(vlib_main_t *vm, ip4_address_t *start, ip4_address_t *end, u32 table_id)
Configure an ipv4 source address range.
Definition: tcp.c:1346
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
void tcp_cc_init(tcp_connection_t *tc)
Definition: tcp_input.c:1204
void tcp_send_reset(tcp_connection_t *tc)
Build and set reset packet for connection.
Definition: tcp_output.c:889
void tcp_punt_unknown(vlib_main_t *vm, u8 is_ip4, u8 is_add)
Definition: tcp.c:1271
format_function_t format_tcp_state
Definition: tcp.h:63
#define clib_warning(format, args...)
Definition: error.h:59
enum _tcp_timers tcp_timers_e
static void tcp_connection_force_ack(tcp_connection_t *tc, vlib_buffer_t *b)
Definition: tcp.h:681
int tcp_half_open_connection_cleanup(tcp_connection_t *tc)
Try to cleanup half-open connection.
Definition: tcp.c:129
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:29
void tcp_connection_timers_init(tcp_connection_t *tc)
Initialize all connection timers as invalid.
Definition: tcp.c:337
void tcp_make_synack(tcp_connection_t *ts, vlib_buffer_t *b)
Convert buffer to SYN-ACK.
Definition: tcp_output.c:602
void tcp_flush_frames_to_output(u8 thread_index)
Flush v4 and v6 tcp and ip-lookup tx frames for thread index.
Definition: tcp_output.c:1035
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:268
format_function_t format_tcp_rcv_sacks
Definition: tcp.h:66
u8 * format_tcp_connection_id(u8 *s, va_list *args)
Definition: tcp.c:717
vlib_node_registration_t tcp6_input_node
(constructor) VLIB_REGISTER_NODE (tcp6_input_node)
Definition: tcp_input.c:3123
fib_node_index_t tcp_lookup_rmt_in_fib(tcp_connection_t *tc)
void tcp_make_ack(tcp_connection_t *ts, vlib_buffer_t *b)
Convert buffer to ACK.
Definition: tcp_output.c:544
static void tcp_timer_update(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:711
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
Definition: tcp.h:342
enum _tcp_cc_algorithm_type tcp_cc_algorithm_type_e
enum _tcp_connection_flag_bits tcp_connection_flag_bits_e
vhost_vring_state_t state
Definition: vhost-user.h:82
void tcp_connection_init_vars(tcp_connection_t *tc)
Initialize tcp connection variables.
Definition: tcp.c:488
u8 * format_tcp_connection(u8 *s, va_list *args)
Definition: tcp.c:741
static u32 tcp_end_seq(tcp_header_t *th, u32 len)
Definition: tcp.h:524
static void init(void)
Definition: client.c:76
struct _tcp_cc_algorithm tcp_cc_algorithm_t
Definition: tcp.h:234
void scoreboard_remove_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp_input.c:526
#define clib_max(x, y)
Definition: clib.h:333
template key/value backing page structure
Definition: bihash_doc.h:44
#define tcp_is_syn(_th)
Definition: tcp_packet.h:89
void tcp_update_snd_mss(tcp_connection_t *tc)
Update snd_mss to reflect the effective segment size that we can send by taking into account all TCP ...
Definition: tcp_output.c:402
static void tcp_persist_timer_update(tcp_connection_t *tc)
Definition: tcp.h:753
static sack_scoreboard_hole_t * scoreboard_get_hole(sack_scoreboard_t *sb, u32 index)
Definition: tcp.h:805
Definition: tcp.h:343
static void * vlib_buffer_push_uninit(vlib_buffer_t *b, u8 size)
Prepend uninitialized data to buffer.
Definition: buffer.h:292
unsigned short u16
Definition: types.h:57
vlib_node_registration_t tcp4_input_node
(constructor) VLIB_REGISTER_NODE (tcp4_input_node)
Definition: tcp_input.c:3100
static u32 tcp_initial_cwnd(const tcp_connection_t *tc)
Initial cwnd as per RFC5681.
Definition: tcp.h:581
tcp_af_t
Definition: tcp.h:340
#define foreach_tcp_fsm_state
TCP FSM state definitions as per RFC793.
Definition: tcp.h:42
void tcp_send_fin(tcp_connection_t *tc)
Send FIN.
Definition: tcp_output.c:1048
#define foreach_tcp_connection_flag
TCP connection flags.
Definition: tcp.h:114
#define foreach_tcp_timer
TCP timers.
Definition: tcp.h:69
double f64
Definition: types.h:142
unsigned char u8
Definition: types.h:56
static u32 tcp_set_time_now(u32 thread_index)
Definition: tcp.h:662
static u8 tcp_is_lost_fin(tcp_connection_t *tc)
Definition: tcp.h:631
static void tcp_retransmit_timer_update(tcp_connection_t *tc)
Definition: tcp.h:767
void tcp_init_snd_vars(tcp_connection_t *tc)
Initialize connection send variables.
Definition: tcp.c:464
void tcp_connection_close(tcp_connection_t *tc)
Begin connection closing procedure.
Definition: tcp.c:270
static void tcp_retransmit_timer_force_update(tcp_connection_t *tc)
Definition: tcp.h:737
#define vnet_buffer(b)
Definition: buffer.h:326
static tcp_connection_t * tcp_connection_get(u32 conn_index, u32 thread_index)
Definition: tcp.h:449
void tcp_update_rto(tcp_connection_t *tc)
Definition: tcp_input.c:419
void tcp_init_mss(tcp_connection_t *tc)
Definition: tcp_output.c:415
u8 data[0]
Packet data.
Definition: buffer.h:159
static void tcp_cc_algo_register(tcp_cc_algorithm_type_e type, const tcp_cc_algorithm_t *vft)
Definition: tcp.h:888
#define foreach_tcp_buf_flag
TCP buffer flags.
Definition: tcp.h:141
enum _tcp_connection_flag tcp_connection_flags_e
format_function_t format_tcp_sacks
Definition: tcp.h:65
#define TCP_TIMER_PERSIST_MIN
Definition: tcp.h:105
#define tcp_opts_sack_permitted(_to)
Definition: tcp_packet.h:160
static u32 tcp_loss_wnd(const tcp_connection_t *tc)
Definition: tcp.h:592
int tcp_configure_v6_source_address_range(vlib_main_t *vm, ip6_address_t *start, ip6_address_t *end, u32 table_id)
Configure an ipv6 source address range.
Definition: tcp.c:1438
u32 flags
Definition: vhost-user.h:77
static void tcp_persist_timer_set(tcp_connection_t *tc)
Definition: tcp.h:744
static tcp_main_t * vnet_get_tcp_main()
Definition: tcp.h:422
static void tcp_cong_recovery_off(tcp_connection_t *tc)
Definition: tcp.h:334
timer_expiration_handler tcp_timer_delack_handler
static_always_inline void clib_spinlock_lock_if_init(clib_spinlock_t *p)
Definition: lock.h:65
static void tcp_retransmit_timer_reset(tcp_connection_t *tc)
Definition: tcp.h:731
void tcp_cc_fastrecovery_exit(tcp_connection_t *tc)
Definition: tcp_input.c:950
void tcp_update_rcv_wnd(tcp_connection_t *tc)
Definition: tcp_output.c:152
static u8 tcp_timer_is_active(tcp_connection_t *tc, tcp_timers_e timer)
Definition: tcp.h:781
int tcp_cc_recover(tcp_connection_t *tc)
Definition: tcp_input.c:985
static tcp_connection_t * tcp_listener_get(u32 tli)
Definition: tcp.h:493
static void tcp_persist_timer_reset(tcp_connection_t *tc)
Definition: tcp.h:761
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128