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Vector Packet Processing
tcp.h
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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 10e-3 /**< TCP tick period (s) */
28 #define THZ 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_MAX_OPTION_SPACE 40
32 
33 #define TCP_DUPACK_THRESHOLD 3
34 #define TCP_MAX_RX_FIFO_SIZE 2 << 20
35 #define TCP_IW_N_SEGMENTS 10
36 
37 /** TCP FSM state definitions as per RFC793. */
38 #define foreach_tcp_fsm_state \
39  _(CLOSED, "CLOSED") \
40  _(LISTEN, "LISTEN") \
41  _(SYN_SENT, "SYN_SENT") \
42  _(SYN_RCVD, "SYN_RCVD") \
43  _(ESTABLISHED, "ESTABLISHED") \
44  _(CLOSE_WAIT, "CLOSE_WAIT") \
45  _(FIN_WAIT_1, "FIN_WAIT_1") \
46  _(LAST_ACK, "LAST_ACK") \
47  _(CLOSING, "CLOSING") \
48  _(FIN_WAIT_2, "FIN_WAIT_2") \
49  _(TIME_WAIT, "TIME_WAIT")
50 
51 typedef enum _tcp_state
52 {
53 #define _(sym, str) TCP_STATE_##sym,
55 #undef _
57 } tcp_state_t;
58 
60 
61 /** TCP timers */
62 #define foreach_tcp_timer \
63  _(RETRANSMIT, "RETRANSMIT") \
64  _(DELACK, "DELAYED ACK") \
65  _(PERSIST, "PERSIST") \
66  _(KEEP, "KEEP") \
67  _(WAITCLOSE, "WAIT CLOSE") \
68  _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
69  _(ESTABLISH, "ESTABLISH")
70 
71 typedef enum _tcp_timers
72 {
73 #define _(sym, str) TCP_TIMER_##sym,
75 #undef _
77 } tcp_timers_e;
78 
79 typedef void (timer_expiration_handler) (u32 index);
80 
84 
85 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
86 
87 /* Timer delays as multiples of 100ms */
88 #define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP
89  * ticks to timer units */
90 #define TCP_DELACK_TIME 1 /* 0.1s */
91 #define TCP_ESTABLISH_TIME 750 /* 75s */
92 #define TCP_2MSL_TIME 300 /* 30s */
93 #define TCP_CLOSEWAIT_TIME 1 /* 0.1s */
94 #define TCP_CLEANUP_TIME 5 /* 0.5s Time to wait before cleanup */
95 
96 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
97 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
98 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
99 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
100 
101 void tcp_update_time (f64 now, u32 thread_index);
102 
103 /** TCP connection flags */
104 #define foreach_tcp_connection_flag \
105  _(DELACK, "Delay ACK") \
106  _(SNDACK, "Send ACK") \
107  _(BURSTACK, "Burst ACK set") \
108  _(FINSNT, "FIN sent") \
109  _(SENT_RCV_WND0, "Sent 0 receive window") \
110  _(RECOVERY, "Recovery on") \
111  _(FAST_RECOVERY, "Fast Recovery on")
112 
113 typedef enum _tcp_connection_flag_bits
114 {
115 #define _(sym, str) TCP_CONN_##sym##_BIT,
117 #undef _
120 
121 typedef enum _tcp_connection_flag
122 {
123 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
125 #undef _
128 
129 /** TCP buffer flags */
130 #define foreach_tcp_buf_flag \
131  _ (ACK) /**< Sending ACK. */ \
132  _ (DUPACK) /**< Sending DUPACK. */ \
133 
134 enum
135 {
136 #define _(f) TCP_BUF_BIT_##f,
138 #undef _
140 };
141 
142 enum
143 {
144 #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f,
146 #undef _
147 };
148 
149 #define TCP_MAX_SACK_BLOCKS 5 /**< Max number of SACK blocks stored */
150 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
152 typedef struct _sack_scoreboard_hole
153 {
154  u32 next; /**< Index for next entry in linked list */
155  u32 prev; /**< Index for previous entry in linked list */
156  u32 start; /**< Start sequence number */
157  u32 end; /**< End sequence number */
159 
160 typedef struct _sack_scoreboard
161 {
162  sack_scoreboard_hole_t *holes; /**< Pool of holes */
163  u32 head; /**< Index to first entry */
164  u32 sacked_bytes; /**< Number of bytes sacked in sb */
166 
167 typedef enum _tcp_cc_algorithm_type
168 {
171 
172 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
174 typedef enum _tcp_cc_ack_t
175 {
176  TCP_CC_ACK,
180 
181 typedef struct _tcp_connection
182 {
183  transport_connection_t connection; /**< Common transport data. First! */
184 
185  u8 state; /**< TCP state as per tcp_state_t */
186  u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
187  u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
188 
189  /* TODO RFC4898 */
190 
191  /** Send sequence variables RFC793 */
192  u32 snd_una; /**< oldest unacknowledged sequence number */
193  u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
194  u32 snd_wnd; /**< send window */
195  u32 snd_wl1; /**< seq number used for last snd.wnd update */
196  u32 snd_wl2; /**< ack number used for last snd.wnd update */
197  u32 snd_nxt; /**< next seq number to be sent */
198 
199  /** Receive sequence variables RFC793 */
200  u32 rcv_nxt; /**< next sequence number expected */
201  u32 rcv_wnd; /**< receive window we expect */
202 
203  u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
204  u32 iss; /**< initial sent sequence */
205  u32 irs; /**< initial remote sequence */
206 
207  /* Options */
208  tcp_options_t opt; /**< TCP connection options parsed */
209  u8 rcv_wscale; /**< Window scale to advertise to peer */
210  u8 snd_wscale; /**< Window scale to use when sending */
211  u32 tsval_recent; /**< Last timestamp received */
212  u32 tsval_recent_age; /**< When last updated tstamp_recent*/
213 
214  sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
215  sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
216 
217  u8 rcv_dupacks; /**< Number of DUPACKs received */
218  u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */
219 
220  /* Congestion control */
221  u32 cwnd; /**< Congestion window */
222  u32 ssthresh; /**< Slow-start threshold */
223  u32 prev_ssthresh; /**< ssthresh before congestion */
224  u32 bytes_acked; /**< Bytes acknowledged by current segment */
225  u32 rtx_bytes; /**< Retransmitted bytes */
226  u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
227  tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
228 
229  /* RTT and RTO */
230  u32 rto; /**< Retransmission timeout */
231  u32 rto_boff; /**< Index for RTO backoff */
232  u32 srtt; /**< Smoothed RTT */
233  u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
234  u32 rtt_ts; /**< Timestamp for tracked ACK */
235  u32 rtt_seq; /**< Sequence number for tracked ACK */
236 
237  u16 snd_mss; /**< Send MSS */
239 
240 struct _tcp_cc_algorithm
241 {
242  void (*rcv_ack) (tcp_connection_t * tc);
243  void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack);
244  void (*congestion) (tcp_connection_t * tc);
245  void (*recovered) (tcp_connection_t * tc);
246  void (*init) (tcp_connection_t * tc);
247 };
248 
249 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
250 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
251 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
252 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
253 #define tcp_recovery_off(tc) ((tc)->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
254 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
256 typedef enum
257 {
258  TCP_IP4,
262 
263 typedef enum _tcp_error
264 {
265 #define tcp_error(n,s) TCP_ERROR_##n,
267 #undef tcp_error
268  TCP_N_ERROR,
270 
271 typedef struct _tcp_lookup_dispatch
272 {
273  u8 next, error;
275 
276 typedef struct _tcp_main
277 {
278  /* Per-worker thread tcp connection pools */
279  tcp_connection_t **connections;
280 
281  /* Pool of listeners. */
282  tcp_connection_t *listener_pool;
283 
284  /** Dispatch table by state and flags */
285  tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
286 
287  u8 log2_tstamp_clocks_per_tick;
288  f64 tstamp_ticks_per_clock;
289 
290  /** per-worker tx buffer free lists */
291  u32 **tx_buffers;
292 
293  /* Per worker-thread timer wheel for connections timers */
294  tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
295 
296  /* Convenience per worker-thread vector of connections to DELACK */
297  u32 **delack_connections;
298 
299  /* Pool of half-open connections on which we've sent a SYN */
300  tcp_connection_t *half_open_connections;
301 
302  /* Pool of local TCP endpoints */
303  transport_endpoint_t *local_endpoints;
304 
305  /* Local endpoints lookup table */
306  transport_endpoint_table_t local_endpoints_table;
307 
308  /* Congestion control algorithms registered */
309  tcp_cc_algorithm_t *cc_algos;
310 
311  /* Flag that indicates if stack is on or off */
312  u8 is_enabled;
313 
314  /* convenience */
319 } tcp_main_t;
320 
321 extern tcp_main_t tcp_main;
326 
329 {
330  return &tcp_main;
331 }
332 
334 
336 tcp_connection_get (u32 conn_index, u32 thread_index)
337 {
338  if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
339  return 0;
340  return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
341 }
342 
344 tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
345 {
346  if (tcp_main.connections[thread_index] == 0)
347  return 0;
348  if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
349  return 0;
350  return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
351 }
352 
357 
358 u8 *format_tcp_connection (u8 * s, va_list * args);
359 u8 *format_tcp_connection_verbose (u8 * s, va_list * args);
360 
362 tcp_listener_get (u32 tli)
363 {
364  return pool_elt_at_index (tcp_main.listener_pool, tli);
365 }
366 
369 {
370  return pool_elt_at_index (tcp_main.half_open_connections, conn_index);
371 }
372 
376 void tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4);
377 void tcp_send_syn (tcp_connection_t * tc);
378 void tcp_send_fin (tcp_connection_t * tc);
380 
382 tcp_end_seq (tcp_header_t * th, u32 len)
383 {
384  return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
385 }
386 
387 /* Modulo arithmetic for TCP sequence numbers */
388 #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
389 #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
390 #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
391 #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
393 /* Modulo arithmetic for timestamps */
394 #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
395 #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
399 {
400  return tc->snd_una_max - tc->snd_una - tc->sack_sb.sacked_bytes
401  + tc->rtx_bytes;
402 }
403 
404 /**
405  * Initial cwnd as per RFC5681
406  */
409 {
410  if (tc->snd_mss > 2190)
411  return 2 * tc->snd_mss;
412  else if (tc->snd_mss > 1095)
413  return 3 * tc->snd_mss;
414  else
415  return 4 * tc->snd_mss;
416 }
417 
419 tcp_loss_wnd (const tcp_connection_t * tc)
420 {
421  return tc->snd_mss;
422 }
423 
426 {
427  return clib_min (tc->cwnd, tc->snd_wnd);
428 }
429 
432 {
433  u32 available_wnd = tcp_available_wnd (tc);
434  u32 flight_size = tcp_flight_size (tc);
435 
436  if (available_wnd <= flight_size)
437  return 0;
438 
439  return available_wnd - flight_size;
440 }
441 
443 
445 
447 tcp_time_now (void)
448 {
449  return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
450 }
451 
453 
454 u32
456  u32 max_bytes);
457 
460 
462 
463 always_inline void
465 {
466  /* Reset flags, make sure ack is sent */
467  tc->flags = TCP_CONN_SNDACK;
468  vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
469 }
470 
471 always_inline void
472 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
473 {
474  tc->timers[timer_id]
475  = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
476  tc->c_c_index, timer_id, interval);
477 }
478 
479 always_inline void
481 {
482  /* XXX Switch to faster TW */
483  tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
484  clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
485 }
486 
487 always_inline void
488 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
489 {
490  if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
491  return;
492 
493  tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
494  tc->timers[timer_id]);
495  tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
496 }
497 
498 always_inline void
499 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
500 {
501  if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
502  tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
503  tc->timers[timer_id]);
504  tc->timers[timer_id] =
505  tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
506  tc->c_c_index, timer_id, interval);
507 }
508 
511 {
512  return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
513 }
514 
515 void
517  sack_scoreboard_hole_t * hole);
518 
521 {
522  if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
523  return pool_elt_at_index (sb->holes, hole->next);
524  return 0;
525 }
526 
529 {
530  if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
531  return pool_elt_at_index (sb->holes, sb->head);
532  return 0;
533 }
534 
535 always_inline void
537 {
539  while ((hole = scoreboard_first_hole (sb)))
540  {
541  scoreboard_remove_hole (sb, hole);
542  }
543 }
544 
547 {
548  return hole->end - hole->start;
549 }
550 
551 always_inline void
553  const tcp_cc_algorithm_t * vft)
554 {
555  tcp_main_t *tm = vnet_get_tcp_main ();
556  vec_validate (tm->cc_algos, type);
557 
558  tm->cc_algos[type] = *vft;
559 }
560 
563 {
564  tcp_main_t *tm = vnet_get_tcp_main ();
565  return &tm->cc_algos[type];
566 }
567 
568 void tcp_cc_init (tcp_connection_t * tc);
569 
570 /**
571  * Push TCP header to buffer
572  *
573  * @param vm - vlib_main
574  * @param b - buffer to write the header to
575  * @param sp_net - source port net order
576  * @param dp_net - destination port net order
577  * @param seq - sequence number net order
578  * @param ack - ack number net order
579  * @param tcp_hdr_opts_len - header and options length in bytes
580  * @param flags - header flags
581  * @param wnd - window size
582  *
583  * @return - pointer to start of TCP header
584  */
585 always_inline void *
587  u32 ack, u8 tcp_hdr_opts_len, u8 flags,
588  u16 wnd)
589 {
590  tcp_header_t *th;
591 
592  th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
593 
594  th->src_port = sp;
595  th->dst_port = dp;
596  th->seq_number = seq;
597  th->ack_number = ack;
598  th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
599  th->flags = flags;
600  th->window = wnd;
601  th->checksum = 0;
602  th->urgent_pointer = 0;
603  return th;
604 }
605 
606 /**
607  * Push TCP header to buffer
608  *
609  * @param b - buffer to write the header to
610  * @param sp_net - source port net order
611  * @param dp_net - destination port net order
612  * @param seq - sequence number host order
613  * @param ack - ack number host order
614  * @param tcp_hdr_opts_len - header and options length in bytes
615  * @param flags - header flags
616  * @param wnd - window size
617  *
618  * @return - pointer to start of TCP header
619  */
620 always_inline void *
621 vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
622  u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
623 {
624  return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
625  clib_host_to_net_u32 (seq),
626  clib_host_to_net_u32 (ack),
627  tcp_hdr_opts_len, flags,
628  clib_host_to_net_u16 (wnd));
629 }
630 
631 #endif /* _vnet_tcp_h_ */
632 
633 /*
634  * fd.io coding-style-patch-verification: ON
635  *
636  * Local Variables:
637  * eval: (c-set-style "gnu")
638  * End:
639  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:436
u32 tcp_prepare_retransmit_segment(tcp_connection_t *tc, vlib_buffer_t *b, u32 max_bytes)
Build a retransmit segment.
Definition: tcp_output.c:922
tcp_main_t tcp_main
Definition: tcp.c:21
#define clib_min(x, y)
Definition: clib.h:332
static void tcp_retransmit_timer_set(tcp_connection_t *tc)
Definition: tcp.h:481
static u32 tcp_available_wnd(const tcp_connection_t *tc)
Definition: tcp.h:426
void tcp_make_fin(tcp_connection_t *tc, vlib_buffer_t *b)
Convert buffer to FIN-ACK.
Definition: tcp_output.c:447
void tcp_send_reset(vlib_buffer_t *pkt, u8 is_ip4)
Send reset without reusing existing buffer.
Definition: tcp_output.c:629
struct _sack_block sack_block_t
void tcp_connection_timers_reset(tcp_connection_t *tc)
Stop all connection timers.
Definition: tcp.c:313
struct _transport_connection transport_connection_t
#define TCP_TO_TIMER_TICK
Definition: tcp.h:88
vlib_node_registration_t tcp4_output_node
(constructor) VLIB_REGISTER_NODE (tcp4_output_node)
Definition: tcp_output.c:1293
void tcp_fast_retransmit(tcp_connection_t *tc)
Definition: tcp_output.c:1098
static tcp_connection_t * tcp_connection_get_if_valid(u32 conn_index, u32 thread_index)
Definition: tcp.h:345
void tcp_connection_del(tcp_connection_t *tc)
Connection removal.
Definition: tcp.c:135
struct _sack_scoreboard sack_scoreboard_t
static tcp_connection_t * tcp_half_open_connection_get(u32 conn_index)
Definition: tcp.h:369
struct _tcp_main tcp_main_t
vlib_node_registration_t tcp6_output_node
(constructor) VLIB_REGISTER_NODE (tcp6_output_node)
Definition: tcp_output.c:1314
static u64 clib_cpu_time_now(void)
Definition: time.h:73
timer_expiration_handler tcp_timer_retransmit_handler
struct _vlib_node_registration vlib_node_registration_t
struct _tcp_lookup_dispatch tcp_lookup_dispatch_t
struct _tcp_connection tcp_connection_t
void tcp_connection_cleanup(tcp_connection_t *tc)
Cleans up connection state.
Definition: tcp.c:99
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
static void scoreboard_clear(sack_scoreboard_t *sb)
Definition: tcp.h:537
struct _tcp_header tcp_header_t
static u32 tcp_available_snd_space(const tcp_connection_t *tc)
Definition: tcp.h:432
void tcp_connection_reset(tcp_connection_t *tc)
Notify session that connection has been reset.
Definition: tcp.c:147
struct _sack_scoreboard_hole sack_scoreboard_hole_t
#define tcp_is_fin(_th)
Definition: tcp_packet.h:90
#define always_inline
Definition: clib.h:84
static timer_callback_t * timers
Definition: timer.c:56
enum _tcp_state tcp_state_t
timer_expiration_handler tcp_timer_retransmit_syn_handler
static u32 tcp_time_now(void)
Definition: tcp.h:448
static tcp_cc_algorithm_t * tcp_cc_algo_get(tcp_cc_algorithm_type_e type)
Definition: tcp.h:563
static u32 scoreboard_hole_bytes(sack_scoreboard_hole_t *hole)
Definition: tcp.h:547
static void tcp_timer_set(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:473
Definition: tcp.h:261
#define TCP_INVALID_SACK_HOLE_INDEX
Definition: tcp.h:151
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:397
u8 * format_tcp_connection_verbose(u8 *s, va_list *args)
Definition: tcp.c:505
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:587
void tcp_retransmit_first_unacked(tcp_connection_t *tc)
Retansmit first unacked segment.
Definition: tcp_output.c:1077
clib_error_t * vnet_tcp_enable_disable(vlib_main_t *vm, u8 is_en)
Definition: tcp.c:780
void tcp_send_syn(tcp_connection_t *tc)
Send SYN.
Definition: tcp_output.c:734
static sack_scoreboard_hole_t * scoreboard_next_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp.h:521
#define TCP_TIMER_HANDLE_INVALID
Definition: tcp.h:85
static u32 tcp_flight_size(const tcp_connection_t *tc)
Definition: tcp.h:399
vnet_main_t vnet_main
Definition: misc.c:43
u32 tcp_push_header(transport_connection_t *tconn, vlib_buffer_t *b)
Definition: tcp_output.c:1336
void( timer_expiration_handler)(u32 index)
Definition: tcp.h:79
enum _tcp_cc_ack_t tcp_cc_ack_t
static void tcp_timer_reset(tcp_connection_t *tc, u8 timer_id)
Definition: tcp.h:489
static sack_scoreboard_hole_t * scoreboard_first_hole(sack_scoreboard_t *sb)
Definition: tcp.h:529
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:622
void tcp_cc_init(tcp_connection_t *tc)
Definition: tcp_input.c:679
clib_bihash_24_8_t transport_endpoint_table_t
Definition: transport.h:242
void tcp_update_time(f64 now, u32 thread_index)
Definition: tcp_input.c:2265
format_function_t format_tcp_state
Definition: tcp.h:59
void tcp_set_snd_mss(tcp_connection_t *tc)
Definition: tcp_output.c:64
enum _tcp_timers tcp_timers_e
static void tcp_connection_force_ack(tcp_connection_t *tc, vlib_buffer_t *b)
Definition: tcp.h:465
void tcp_connection_timers_init(tcp_connection_t *tc)
Initialize all connection timers as invalid.
Definition: tcp.c:296
void tcp_make_synack(tcp_connection_t *ts, vlib_buffer_t *b)
Convert buffer to SYN-ACK.
Definition: tcp_output.c:468
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:238
vlib_node_registration_t tcp6_input_node
(constructor) VLIB_REGISTER_NODE (tcp6_input_node)
Definition: tcp_input.c:2243
static void init(void)
Definition: pneum.c:76
void tcp_make_ack(tcp_connection_t *ts, vlib_buffer_t *b)
Convert buffer to ACK.
Definition: tcp_output.c:433
static void tcp_timer_update(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:500
int vlib_main(vlib_main_t *volatile vm, unformat_input_t *input)
Definition: main.c:1654
unsigned int u32
Definition: types.h:88
Definition: tcp.h:259
enum _tcp_cc_algorithm_type tcp_cc_algorithm_type_e
ip6_main_t ip6_main
Definition: ip6_forward.c:2846
IPv4 main type.
Definition: ip4.h:107
enum _tcp_connection_flag_bits tcp_connection_flag_bits_e
vhost_vring_state_t state
Definition: vhost-user.h:83
void tcp_connection_init_vars(tcp_connection_t *tc)
Initialize tcp connection variables.
Definition: tcp.c:327
u8 * format_tcp_connection(u8 *s, va_list *args)
Definition: tcp.c:482
static u32 tcp_end_seq(tcp_header_t *th, u32 len)
Definition: tcp.h:383
struct _tcp_cc_algorithm tcp_cc_algorithm_t
Definition: tcp.h:173
void scoreboard_remove_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp_input.c:408
#define clib_max(x, y)
Definition: clib.h:325
#define tcp_is_syn(_th)
Definition: tcp_packet.h:89
Definition: tcp.h:260
static void * vlib_buffer_push_uninit(vlib_buffer_t *b, u8 size)
Prepend uninitialized data to buffer.
Definition: buffer.h:273
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:2220
static u32 tcp_initial_cwnd(const tcp_connection_t *tc)
Initial cwnd as per RFC5681.
Definition: tcp.h:409
tcp_af_t
Definition: tcp.h:257
#define foreach_tcp_fsm_state
TCP FSM state definitions as per RFC793.
Definition: tcp.h:38
void tcp_send_fin(tcp_connection_t *tc)
Send FIN.
Definition: tcp_output.c:811
#define foreach_tcp_connection_flag
TCP connection flags.
Definition: tcp.h:104
#define foreach_tcp_timer
TCP timers.
Definition: tcp.h:62
double f64
Definition: types.h:142
unsigned char u8
Definition: types.h:56
struct _transport_endpoint transport_endpoint_t
void tcp_connection_close(tcp_connection_t *tc)
Begin connection closing procedure.
Definition: tcp.c:170
#define vnet_buffer(b)
Definition: buffer.h:294
static tcp_connection_t * tcp_connection_get(u32 conn_index, u32 thread_index)
Definition: tcp.h:337
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1117
static void tcp_cc_algo_register(tcp_cc_algorithm_type_e type, const tcp_cc_algorithm_t *vft)
Definition: tcp.h:553
#define foreach_tcp_buf_flag
TCP buffer flags.
Definition: tcp.h:130
enum _tcp_connection_flag tcp_connection_flags_e
static u32 tcp_loss_wnd(const tcp_connection_t *tc)
Definition: tcp.h:420
u32 flags
Definition: vhost-user.h:78
static tcp_main_t * vnet_get_tcp_main()
Definition: tcp.h:329
timer_expiration_handler tcp_timer_delack_handler
static u8 tcp_timer_is_active(tcp_connection_t *tc, tcp_timers_e timer)
Definition: tcp.h:511
static tcp_connection_t * tcp_listener_get(u32 tli)
Definition: tcp.h:363