2 * Copyright (c) 2016-2019 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
33 #define TCP_CC_DATA_SZ 24
34 #define TCP_MAX_GSO_SZ 65536
35 #define TCP_RXT_MAX_BURST 10
37 #define TCP_DUPACK_THRESHOLD 3
38 #define TCP_IW_N_SEGMENTS 10
39 #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */
40 #define TCP_USE_SACKS 1 /**< Disable only for testing */
42 /** TCP FSM state definitions as per RFC793. */
43 #define foreach_tcp_fsm_state \
46 _(SYN_SENT, "SYN_SENT") \
47 _(SYN_RCVD, "SYN_RCVD") \
48 _(ESTABLISHED, "ESTABLISHED") \
49 _(CLOSE_WAIT, "CLOSE_WAIT") \
50 _(FIN_WAIT_1, "FIN_WAIT_1") \
51 _(LAST_ACK, "LAST_ACK") \
52 _(CLOSING, "CLOSING") \
53 _(FIN_WAIT_2, "FIN_WAIT_2") \
54 _(TIME_WAIT, "TIME_WAIT")
56 typedef enum _tcp_state
58 #define _(sym, str) TCP_STATE_##sym,
64 format_function_t format_tcp_state;
65 format_function_t format_tcp_flags;
66 format_function_t format_tcp_sacks;
67 format_function_t format_tcp_rcv_sacks;
70 #define foreach_tcp_timer \
71 _(RETRANSMIT, "RETRANSMIT") \
72 _(DELACK, "DELAYED ACK") \
73 _(PERSIST, "PERSIST") \
74 _(WAITCLOSE, "WAIT CLOSE") \
75 _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
77 typedef enum _tcp_timers
79 #define _(sym, str) TCP_TIMER_##sym,
85 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
87 #define TCP_TIMER_TICK 0.1 /**< Timer tick in seconds */
88 #define TCP_TO_TIMER_TICK TCP_TICK*10 /**< Factor for converting
89 ticks to timer ticks */
91 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
92 #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
93 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
94 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
95 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
96 #define TCP_RTO_BOFF_MAX 8 /* Max number of retries before reset */
97 #define TCP_ESTABLISH_TIME (60 * THZ) /* Connection establish timeout */
99 /** Connection configuration flags */
100 #define foreach_tcp_cfg_flag \
101 _(RATE_SAMPLE, "Rate sampling") \
102 _(NO_CSUM_OFFLOAD, "No csum offload") \
103 _(NO_TSO, "TSO off") \
105 _(NO_ENDPOINT,"No endpoint") \
107 typedef enum tcp_cfg_flag_bits_
109 #define _(sym, str) TCP_CFG_F_##sym##_BIT,
113 } tcp_cfg_flag_bits_e;
115 typedef enum tcp_cfg_flag_
117 #define _(sym, str) TCP_CFG_F_##sym = 1 << TCP_CFG_F_##sym##_BIT,
123 /** TCP connection flags */
124 #define foreach_tcp_connection_flag \
125 _(SNDACK, "Send ACK") \
126 _(FINSNT, "FIN sent") \
127 _(RECOVERY, "Recovery") \
128 _(FAST_RECOVERY, "Fast Recovery") \
129 _(DCNT_PENDING, "Disconnect pending") \
130 _(HALF_OPEN_DONE, "Half-open completed") \
131 _(FINPNDG, "FIN pending") \
132 _(RXT_PENDING, "Retransmit pending") \
133 _(FRXT_FIRST, "Retransmit first") \
134 _(DEQ_PENDING, "Dequeue pending ") \
135 _(PSH_PENDING, "PSH pending") \
136 _(FINRCVD, "FIN received") \
137 _(ZERO_RWND_SENT, "Zero RWND sent") \
139 typedef enum tcp_connection_flag_bits_
141 #define _(sym, str) TCP_CONN_##sym##_BIT,
142 foreach_tcp_connection_flag
145 } tcp_connection_flag_bits_e;
147 typedef enum tcp_connection_flag_
149 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
150 foreach_tcp_connection_flag
153 } tcp_connection_flags_e;
155 #define TCP_SCOREBOARD_TRACE (0)
156 #define TCP_MAX_SACK_BLOCKS 256 /**< Max number of SACK blocks stored */
157 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
159 typedef struct _scoreboard_trace_elt
166 } scoreboard_trace_elt_t;
168 typedef struct _sack_scoreboard_hole
170 u32 next; /**< Index for next entry in linked list */
171 u32 prev; /**< Index for previous entry in linked list */
172 u32 start; /**< Start sequence number */
173 u32 end; /**< End sequence number */
174 u8 is_lost; /**< Mark hole as lost */
175 } sack_scoreboard_hole_t;
177 typedef struct _sack_scoreboard
179 sack_scoreboard_hole_t *holes; /**< Pool of holes */
180 u32 head; /**< Index of first entry */
181 u32 tail; /**< Index of last entry */
182 u32 sacked_bytes; /**< Number of bytes sacked in sb */
183 u32 last_sacked_bytes; /**< Number of bytes last sacked */
184 u32 last_bytes_delivered; /**< Sack bytes delivered to app */
185 u32 rxt_sacked; /**< Rxt bytes last delivered */
186 u32 high_sacked; /**< Highest byte sacked (fack) */
187 u32 high_rxt; /**< Highest retransmitted sequence */
188 u32 rescue_rxt; /**< Rescue sequence number */
189 u32 lost_bytes; /**< Bytes lost as per RFC6675 */
190 u32 last_lost_bytes; /**< Number of bytes last lost */
191 u32 cur_rxt_hole; /**< Retransmitting from this hole */
194 #if TCP_SCOREBOARD_TRACE
195 scoreboard_trace_elt_t *trace;
200 #if TCP_SCOREBOARD_TRACE
201 #define tcp_scoreboard_trace_add(_tc, _ack) \
203 static u64 _group = 0; \
204 sack_scoreboard_t *_sb = &_tc->sack_sb; \
205 sack_block_t *_sack, *_sacks; \
206 scoreboard_trace_elt_t *_elt; \
209 _sacks = _tc->rcv_opts.sacks; \
210 for (i = 0; i < vec_len (_sacks); i++) \
212 _sack = &_sacks[i]; \
213 vec_add2 (_sb->trace, _elt, 1); \
214 _elt->start = _sack->start; \
215 _elt->end = _sack->end; \
216 _elt->ack = _elt->end == _ack ? _ack : 0; \
217 _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \
218 _elt->group = _group; \
222 #define tcp_scoreboard_trace_add(_tc, _ack)
225 sack_scoreboard_hole_t *scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
226 sack_scoreboard_hole_t *
227 start, u8 have_sent_1_smss,
230 sack_scoreboard_hole_t *scoreboard_get_hole (sack_scoreboard_t * sb,
233 sack_scoreboard_hole_t *scoreboard_next_hole (sack_scoreboard_t * sb,
234 sack_scoreboard_hole_t * hole);
235 sack_scoreboard_hole_t *scoreboard_prev_hole (sack_scoreboard_t * sb,
236 sack_scoreboard_hole_t * hole);
237 sack_scoreboard_hole_t *scoreboard_first_hole (sack_scoreboard_t * sb);
238 sack_scoreboard_hole_t *scoreboard_last_hole (sack_scoreboard_t * sb);
240 void scoreboard_clear (sack_scoreboard_t * sb);
241 void scoreboard_clear_reneging (sack_scoreboard_t * sb, u32 start, u32 end);
242 void scoreboard_init (sack_scoreboard_t * sb);
243 void scoreboard_init_rxt (sack_scoreboard_t * sb, u32 snd_una);
244 u8 *format_tcp_scoreboard (u8 * s, va_list * args);
246 #define TCP_BTS_INVALID_INDEX ((u32)~0)
248 typedef enum tcp_bts_flags_
251 TCP_BTS_IS_APP_LIMITED = 1 << 1,
252 TCP_BTS_IS_SACKED = 1 << 2,
253 TCP_BTS_IS_RXT_LOST = 1 << 3,
254 } __clib_packed tcp_bts_flags_t;
256 typedef struct tcp_bt_sample_
258 u32 next; /**< Next sample index in list */
259 u32 prev; /**< Previous sample index in list */
260 u32 min_seq; /**< Min seq number in sample */
261 u32 max_seq; /**< Max seq number. Set for rxt samples */
262 u64 delivered; /**< Total delivered bytes for sample */
263 f64 delivered_time; /**< Delivered time when sample taken */
264 f64 tx_time; /**< Transmit time for the burst */
265 f64 first_tx_time; /**< Connection first tx time at tx */
266 u64 tx_in_flight; /**< In flight at tx time */
267 u64 tx_lost; /**< Lost at tx time */
268 tcp_bts_flags_t flags; /**< Sample flag */
271 typedef struct tcp_rate_sample_
273 u64 prior_delivered; /**< Delivered of sample used for rate, i.e.,
274 total bytes delivered at prior_time */
275 f64 prior_time; /**< Delivered time of sample used for rate */
276 f64 interval_time; /**< Time to ack the bytes delivered */
277 f64 rtt_time; /**< RTT for sample */
278 u64 tx_in_flight; /**< In flight at (re)transmit time */
279 u64 tx_lost; /**< Lost over interval */
280 u32 delivered; /**< Bytes delivered in interval_time */
281 u32 acked_and_sacked; /**< Bytes acked + sacked now */
282 u32 last_lost; /**< Bytes lost now */
283 u32 lost; /**< Number of bytes lost over interval */
284 tcp_bts_flags_t flags; /**< Rate sample flags from bt sample */
287 typedef struct tcp_byte_tracker_
289 tcp_bt_sample_t *samples; /**< Pool of samples */
290 rb_tree_t sample_lookup; /**< Rbtree for sample lookup by min_seq */
291 u32 head; /**< Head of samples linked list */
292 u32 tail; /**< Tail of samples linked list */
293 u32 last_ooo; /**< Cached last ooo sample */
294 } tcp_byte_tracker_t;
296 typedef enum _tcp_cc_algorithm_type
300 TCP_CC_LAST = TCP_CC_CUBIC
301 } tcp_cc_algorithm_type_e;
303 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
305 typedef enum _tcp_cc_ack_t
312 typedef enum tcp_cc_event_
318 * As per RFC4898 tcpEStatsStackSoftErrors
320 typedef struct tcp_errors_
322 u32 below_data_wnd; /**< All data in seg is below snd_una */
323 u32 above_data_wnd; /**< Some data in segment is above snd_wnd */
324 u32 below_ack_wnd; /**< Acks for data below snd_una */
325 u32 above_ack_wnd; /**< Acks for data not sent */
328 typedef struct _tcp_connection
330 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
331 transport_connection_t connection; /**< Common transport data. First! */
333 u8 state; /**< TCP state as per tcp_state_t */
334 u8 cfg_flags; /**< Connection configuration flags */
335 u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
336 u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
338 u64 segs_in; /** RFC4022/4898 tcpHCInSegs/tcpEStatsPerfSegsIn */
339 u64 bytes_in; /** RFC4898 tcpEStatsPerfHCDataOctetsIn */
340 u64 segs_out; /** RFC4898 tcpEStatsPerfSegsOut */
341 u64 bytes_out; /** RFC4898 tcpEStatsPerfHCDataOctetsOut */
343 /** Send sequence variables RFC793 */
344 u32 snd_una; /**< oldest unacknowledged sequence number */
345 u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
346 u32 snd_wnd; /**< send window */
347 u32 snd_wl1; /**< seq number used for last snd.wnd update */
348 u32 snd_wl2; /**< ack number used for last snd.wnd update */
349 u32 snd_nxt; /**< next seq number to be sent */
350 u16 snd_mss; /**< Effective send max seg (data) size */
352 u64 data_segs_in; /** RFC4898 tcpEStatsPerfDataSegsIn */
353 u64 data_segs_out; /** RFC4898 tcpEStatsPerfDataSegsOut */
355 /** Receive sequence variables RFC793 */
356 u32 rcv_nxt; /**< next sequence number expected */
357 u32 rcv_wnd; /**< receive window we expect */
359 u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
360 u32 iss; /**< initial sent sequence */
361 u32 irs; /**< initial remote sequence */
364 u8 snd_opts_len; /**< Tx options len */
365 u8 rcv_wscale; /**< Window scale to advertise to peer */
366 u8 snd_wscale; /**< Window scale to use when sending */
367 u32 tsval_recent; /**< Last timestamp received */
368 u32 tsval_recent_age; /**< When last updated tstamp_recent*/
369 tcp_options_t snd_opts; /**< Tx options for connection */
370 tcp_options_t rcv_opts; /**< Rx options for connection */
372 sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
373 u8 snd_sack_pos; /**< Position in vec of first block to send */
374 sack_block_t *snd_sacks_fl; /**< Vector for building new list */
375 sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
377 u16 rcv_dupacks; /**< Number of recent DUPACKs received */
378 u32 dupacks_in; /**< RFC4898 tcpEStatsStackDupAcksIn*/
379 u8 pending_dupacks; /**< Number of DUPACKs to be sent */
380 u32 dupacks_out; /**< RFC4898 tcpEStatsPathDupAcksOut */
382 /* Congestion control */
383 u32 cwnd; /**< Congestion window */
384 u32 cwnd_acc_bytes; /**< Bytes accumulated for cwnd increment */
385 u32 ssthresh; /**< Slow-start threshold */
386 u32 prev_ssthresh; /**< ssthresh before congestion */
387 u32 prev_cwnd; /**< ssthresh before congestion */
388 u32 bytes_acked; /**< Bytes acknowledged by current segment */
389 u32 burst_acked; /**< Bytes acknowledged in current burst */
390 u32 snd_rxt_bytes; /**< Retransmitted bytes during current cc event */
391 u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
392 u32 prr_delivered; /**< RFC6937 bytes delivered during current event */
393 u32 prr_start; /**< snd_una when prr starts */
394 u32 rxt_delivered; /**< Rxt bytes delivered during current cc event */
395 u32 rxt_head; /**< snd_una last time we re rxted the head */
396 u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
397 u32 snd_congestion; /**< snd_una_max when congestion is detected */
398 u32 tx_fifo_size; /**< Tx fifo size. Used to constrain cwnd */
399 tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
400 u8 cc_data[TCP_CC_DATA_SZ]; /**< Congestion control algo private data */
402 u32 fr_occurences; /**< fast-retransmit occurrences RFC4898
403 tcpEStatsStackFastRetran */
404 u32 tr_occurences; /**< timer-retransmit occurrences */
405 u64 bytes_retrans; /**< RFC4898 tcpEStatsPerfOctetsRetrans */
406 u64 segs_retrans; /**< RFC4898 tcpEStatsPerfSegsRetrans*/
409 u32 rto; /**< Retransmission timeout */
410 u32 rto_boff; /**< Index for RTO backoff */
411 u32 srtt; /**< Smoothed RTT */
412 u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
413 u32 rtt_seq; /**< Sequence number for tracked ACK */
414 f64 rtt_ts; /**< Timestamp for tracked ACK */
415 f64 mrtt_us; /**< High precision mrtt from tracked acks */
417 u32 psh_seq; /**< Add psh header for seg that includes this */
418 u32 next_node_index; /**< Can be used to control next node in output */
419 u32 next_node_opaque; /**< Opaque to pass to next node */
420 u32 limited_transmit; /**< snd_nxt when limited transmit starts */
421 u32 sw_if_index; /**< Interface for the connection */
423 /* Delivery rate estimation */
424 u64 delivered; /**< Total bytes delivered to peer */
425 u64 app_limited; /**< Delivered when app-limited detected */
426 f64 delivered_time; /**< Time last bytes were acked */
427 f64 first_tx_time; /**< Send time for recently delivered/sent */
428 u64 lost; /**< Total bytes lost */
429 tcp_byte_tracker_t *bt; /**< Tx byte tracker */
431 tcp_errors_t errors; /**< Soft connection errors */
433 f64 start_ts; /**< Timestamp when connection initialized */
434 u32 last_fib_check; /**< Last time we checked fib route for peer */
435 u16 mss; /**< Our max seg size that includes options */
436 u32 timestamp_delta; /**< Offset for timestamp */
437 u32 ipv6_flow_label; /**< flow label for ipv6 header */
439 #define rst_state snd_wl1
443 struct _tcp_cc_algorithm
446 uword (*unformat_cfg) (unformat_input_t * input);
447 void (*init) (tcp_connection_t * tc);
448 void (*cleanup) (tcp_connection_t * tc);
449 void (*rcv_ack) (tcp_connection_t * tc, tcp_rate_sample_t *rs);
450 void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack,
451 tcp_rate_sample_t *rs);
452 void (*congestion) (tcp_connection_t * tc);
453 void (*loss) (tcp_connection_t * tc);
454 void (*recovered) (tcp_connection_t * tc);
455 void (*undo_recovery) (tcp_connection_t * tc);
456 void (*event) (tcp_connection_t *tc, tcp_cc_event_t evt);
457 u64 (*get_pacing_rate) (tcp_connection_t *tc);
461 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
462 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
463 #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
464 #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
465 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
466 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
467 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
468 #define tcp_disconnect_pending(tc) ((tc)->flags & TCP_CONN_DCNT_PENDING)
469 #define tcp_disconnect_pending_on(tc) ((tc)->flags |= TCP_CONN_DCNT_PENDING)
470 #define tcp_disconnect_pending_off(tc) ((tc)->flags &= ~TCP_CONN_DCNT_PENDING)
471 #define tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST)
472 #define tcp_fastrecovery_first_on(tc) ((tc)->flags |= TCP_CONN_FRXT_FIRST)
473 #define tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST)
475 #define tcp_in_cong_recovery(tc) ((tc)->flags & \
476 (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
478 #define tcp_csum_offload(tc) (!((tc)->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
480 typedef void (timer_expiration_handler) (tcp_connection_t * tc);
482 extern timer_expiration_handler tcp_timer_delack_handler;
483 extern timer_expiration_handler tcp_timer_retransmit_handler;
484 extern timer_expiration_handler tcp_timer_persist_handler;
485 extern timer_expiration_handler tcp_timer_retransmit_syn_handler;
488 tcp_cong_recovery_off (tcp_connection_t * tc)
490 tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
491 tcp_fastrecovery_first_off (tc);
494 #define tcp_zero_rwnd_sent(tc) ((tc)->flags & TCP_CONN_ZERO_RWND_SENT)
495 #define tcp_zero_rwnd_sent_on(tc) (tc)->flags |= TCP_CONN_ZERO_RWND_SENT
496 #define tcp_zero_rwnd_sent_off(tc) (tc)->flags &= ~TCP_CONN_ZERO_RWND_SENT
498 typedef enum _tcp_error
500 #define tcp_error(n,s) TCP_ERROR_##n,
501 #include <vnet/tcp/tcp_error.def>
506 typedef struct _tcp_lookup_dispatch
509 } tcp_lookup_dispatch_t;
511 #define foreach_tcp_wrk_stat \
512 _(timer_expirations, u64, "timer expirations") \
513 _(rxt_segs, u64, "segments retransmitted") \
514 _(tr_events, u32, "timer retransmit events") \
515 _(to_closewait, u32, "timeout close-wait") \
516 _(to_closewait2, u32, "timeout close-wait w/data") \
517 _(to_finwait1, u32, "timeout fin-wait-1") \
518 _(to_finwait2, u32, "timeout fin-wait-2") \
519 _(to_lastack, u32, "timeout last-ack") \
520 _(to_closing, u32, "timeout closing") \
521 _(tr_abort, u32, "timer retransmit abort") \
522 _(rst_unread, u32, "reset on close due to unread data") \
524 typedef struct tcp_wrk_stats_
526 #define _(name, type, str) type name;
531 typedef struct tcp_free_req_
533 clib_time_type_t free_time;
534 u32 connection_index;
537 typedef struct tcp_worker_ctx_
539 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
541 /** worker's pool of connections */
542 tcp_connection_t *connections;
544 /** vector of pending ack dequeues */
545 u32 *pending_deq_acked;
547 /** vector of pending disconnect notifications */
548 u32 *pending_disconnects;
550 /** vector of pending reset notifications */
553 /** convenience pointer to this thread's vlib main */
559 /* Max timers to be handled per dispatch loop */
560 u32 max_timers_per_loop;
562 /** tx frames for ip 4/6 lookup nodes */
563 vlib_frame_t *ip_lookup_tx_frames[2];
565 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
567 /** cached 'on the wire' options for bursts */
570 /** tx buffer free list */
573 /* Fifo of pending timer expirations */
576 /* fifo of pending free requests */
577 tcp_cleanup_req_t *pending_cleanups;
579 /** worker timer wheel */
580 tw_timer_wheel_16t_2w_512sl_t timer_wheel;
582 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
584 tcp_wrk_stats_t stats;
587 #define tcp_worker_stats_inc(_ti,_stat,_val) \
588 tcp_main.wrk_ctx[_ti].stats._stat += _val
590 #define tcp_workerp_stats_inc(_wrk,_stat,_val) \
591 _wrk->stats._stat += _val
593 typedef struct tcp_iss_seed_
599 typedef struct tcp_configuration_
601 /** Max rx fifo size for a session (in bytes). It is used in to compute the
602 * rfc 7323 window scaling factor */
605 /** Min rx fifo for a session (in bytes) */
608 /** Default MTU to be used when establishing connections */
611 /** Initial CWND multiplier, which multiplies MSS to determine initial CWND.
612 * Set 0 to determine the initial CWND by another way */
613 u16 initial_cwnd_multiplier;
615 /** Enable tx pacing for new connections */
618 /** Allow use of TSO whenever available */
621 /** Set if csum offloading is enabled */
624 /** Default congestion control algorithm type */
625 tcp_cc_algorithm_type_e cc_algo;
627 /** Min rwnd, as number of snd_mss segments, for update ack to be sent after
628 * a zero rwnd advertisement */
629 u32 rwnd_min_update_ack;
631 /** Delayed ack time (disabled) */
634 /** Timer ticks to wait for close from app */
637 /** Timer ticks to wait in time-wait. Also known as 2MSL */
640 /** Timer ticks to wait in fin-wait1 to send fin and rcv fin-ack */
643 /** Timer ticks to wait in last ack for ack */
646 /** Timer ticks to wait in fin-wait2 for fin */
649 /** Timer ticks to wait in closing for fin ack */
652 /** Time to wait (sec) before cleaning up the connection */
655 /** Number of preallocated connections */
656 u32 preallocated_connections;
658 /** Number of preallocated half-open connections */
659 u32 preallocated_half_open_connections;
661 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
662 ip4_address_t *ip4_src_addrs;
663 ip6_address_t *ip6_src_addrs;
665 /** Fault-injection. Debug only */
666 f64 buffer_fail_fraction;
667 } tcp_configuration_t;
669 typedef struct _tcp_main
671 /** per-worker context */
672 tcp_worker_ctx_t *wrk_ctx;
674 /* Pool of listeners. */
675 tcp_connection_t *listener_pool;
677 f64 tstamp_ticks_per_clock;
679 /** vlib buffer size */
680 u32 bytes_per_buffer;
682 /** Dispatch table by state and flags */
683 tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
685 clib_spinlock_t half_open_lock;
687 /** Pool of half-open connections on which we've sent a SYN */
688 tcp_connection_t *half_open_connections;
690 /** Seed used to generate random iss */
691 tcp_iss_seed_t iss_seed;
693 /** Congestion control algorithms registered */
694 tcp_cc_algorithm_t *cc_algos;
696 /** Hash table of cc algorithms by name */
697 uword *cc_algo_by_name;
699 /** Last cc algo registered */
700 tcp_cc_algorithm_type_e cc_last_type;
702 /** Flag that indicates if stack is on or off */
705 /** Flag that indicates if v4 punting is enabled */
708 /** Flag that indicates if v6 punting is enabled */
711 /** Rotor for v4 source addresses */
712 u32 last_v4_addr_rotor;
714 /** Rotor for v6 source addresses */
715 u32 last_v6_addr_rotor;
717 /** Protocol configuration */
718 tcp_configuration_t cfg;
721 extern tcp_main_t tcp_main;
722 extern vlib_node_registration_t tcp4_input_node;
723 extern vlib_node_registration_t tcp6_input_node;
724 extern vlib_node_registration_t tcp4_output_node;
725 extern vlib_node_registration_t tcp6_output_node;
726 extern vlib_node_registration_t tcp4_established_node;
727 extern vlib_node_registration_t tcp6_established_node;
728 extern vlib_node_registration_t tcp4_syn_sent_node;
729 extern vlib_node_registration_t tcp6_syn_sent_node;
730 extern vlib_node_registration_t tcp4_rcv_process_node;
731 extern vlib_node_registration_t tcp6_rcv_process_node;
732 extern vlib_node_registration_t tcp4_listen_node;
733 extern vlib_node_registration_t tcp6_listen_node;
735 #define tcp_cfg tcp_main.cfg
736 #define tcp_node_index(node_id, is_ip4) \
737 ((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index)
739 always_inline tcp_main_t *
745 always_inline tcp_worker_ctx_t *
746 tcp_get_worker (u32 thread_index)
748 ASSERT (thread_index < vec_len (tcp_main.wrk_ctx));
749 return &tcp_main.wrk_ctx[thread_index];
752 always_inline tcp_header_t *
753 tcp_buffer_hdr (vlib_buffer_t * b)
755 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
756 return (tcp_header_t *) (b->data + b->current_data
757 + vnet_buffer (b)->tcp.hdr_offset);
760 #if (VLIB_BUFFER_TRACE_TRAJECTORY)
761 #define tcp_trajectory_add_start(b, start) \
763 (*vlib_buffer_trace_trajectory_cb) (b, start); \
766 #define tcp_trajectory_add_start(b, start)
769 clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
771 void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
773 always_inline tcp_connection_t *
774 tcp_connection_get (u32 conn_index, u32 thread_index)
776 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
777 if (PREDICT_FALSE (pool_is_free_index (wrk->connections, conn_index)))
779 return pool_elt_at_index (wrk->connections, conn_index);
782 always_inline tcp_connection_t *
783 tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
785 tcp_worker_ctx_t *wrk;
786 if (thread_index >= vec_len (tcp_main.wrk_ctx))
788 wrk = tcp_get_worker (thread_index);
789 if (pool_is_free_index (wrk->connections, conn_index))
791 return pool_elt_at_index (wrk->connections, conn_index);
794 always_inline tcp_connection_t *
795 tcp_get_connection_from_transport (transport_connection_t * tconn)
797 return (tcp_connection_t *) tconn;
801 tcp_connection_set_state (tcp_connection_t * tc, tcp_state_t state)
804 TCP_EVT (TCP_EVT_STATE_CHANGE, tc);
807 void tcp_connection_close (tcp_connection_t * tc);
808 void tcp_connection_cleanup (tcp_connection_t * tc);
809 void tcp_connection_del (tcp_connection_t * tc);
810 int tcp_half_open_connection_cleanup (tcp_connection_t * tc);
811 tcp_connection_t *tcp_connection_alloc (u8 thread_index);
812 tcp_connection_t *tcp_connection_alloc_w_base (u8 thread_index,
813 tcp_connection_t * base);
814 void tcp_connection_free (tcp_connection_t * tc);
815 int tcp_configure_v4_source_address_range (vlib_main_t * vm,
816 ip4_address_t * start,
817 ip4_address_t * end, u32 table_id);
818 int tcp_configure_v6_source_address_range (vlib_main_t * vm,
819 ip6_address_t * start,
820 ip6_address_t * end, u32 table_id);
821 void tcp_api_reference (void);
822 u8 *format_tcp_connection (u8 * s, va_list * args);
823 u8 *format_tcp_connection_id (u8 * s, va_list * args);
825 always_inline tcp_connection_t *
826 tcp_listener_get (u32 tli)
828 tcp_connection_t *tc = 0;
829 if (!pool_is_free_index (tcp_main.listener_pool, tli))
830 tc = pool_elt_at_index (tcp_main.listener_pool, tli);
834 always_inline tcp_connection_t *
835 tcp_half_open_connection_get (u32 conn_index)
837 tcp_connection_t *tc = 0;
838 clib_spinlock_lock_if_init (&tcp_main.half_open_lock);
839 if (!pool_is_free_index (tcp_main.half_open_connections, conn_index))
840 tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index);
841 clib_spinlock_unlock_if_init (&tcp_main.half_open_lock);
845 void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b);
846 void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b);
847 void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
848 u32 thread_index, u8 is_ip4);
849 void tcp_send_reset (tcp_connection_t * tc);
850 void tcp_send_syn (tcp_connection_t * tc);
851 void tcp_send_synack (tcp_connection_t * tc);
852 void tcp_send_fin (tcp_connection_t * tc);
853 void tcp_send_ack (tcp_connection_t * tc);
854 void tcp_update_burst_snd_vars (tcp_connection_t * tc);
855 void tcp_update_rto (tcp_connection_t * tc);
856 void tcp_send_window_update_ack (tcp_connection_t * tc);
858 void tcp_program_ack (tcp_connection_t * tc);
859 void tcp_program_dupack (tcp_connection_t * tc);
860 void tcp_program_retransmit (tcp_connection_t * tc);
867 * Byte tracker initialize
869 * @param tc connection for which the byte tracker should be allocated and
872 void tcp_bt_init (tcp_connection_t * tc);
874 * Byte tracker cleanup
876 * @param tc connection for which the byte tracker should be cleaned up
878 void tcp_bt_cleanup (tcp_connection_t * tc);
880 * Flush byte tracker samples
882 * @param tc tcp connection for which samples should be flushed
884 void tcp_bt_flush_samples (tcp_connection_t * tc);
886 * Track a tcp tx burst
888 * @param tc tcp connection
890 void tcp_bt_track_tx (tcp_connection_t * tc, u32 len);
892 * Track a tcp retransmission
894 * @param tc tcp connection
895 * @param start start sequence number
896 * @param end end sequence number
898 void tcp_bt_track_rxt (tcp_connection_t * tc, u32 start, u32 end);
900 * Generate a delivery rate sample from recently acked bytes
902 * @param tc tcp connection
903 * @param rs resulting rate sample
905 void tcp_bt_sample_delivery_rate (tcp_connection_t * tc,
906 tcp_rate_sample_t * rs);
908 * Check if sample to be generated is app limited
910 * @param tc tcp connection
912 void tcp_bt_check_app_limited (tcp_connection_t * tc);
914 * Check if the byte tracker is in sane state
916 * Should be used only for testing
918 * @param bt byte tracker
920 int tcp_bt_is_sane (tcp_byte_tracker_t * bt);
921 u8 *format_tcp_bt (u8 * s, va_list * args);
924 tcp_end_seq (tcp_header_t * th, u32 len)
926 return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
929 /* Modulo arithmetic for TCP sequence numbers */
930 #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
931 #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
932 #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
933 #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
934 #define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
936 /* Modulo arithmetic for timestamps */
937 #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
938 #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
941 * Our estimate of the number of bytes that have left the network
944 tcp_bytes_out (const tcp_connection_t * tc)
946 if (tcp_opts_sack_permitted (&tc->rcv_opts))
947 return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes;
949 return clib_min (tc->rcv_dupacks * tc->snd_mss,
950 tc->snd_nxt - tc->snd_una);
954 * Our estimate of the number of bytes in flight (pipe size)
957 tcp_flight_size (const tcp_connection_t * tc)
961 flight_size = (int) (tc->snd_nxt - tc->snd_una) - tcp_bytes_out (tc)
962 + tc->snd_rxt_bytes - tc->rxt_delivered;
964 ASSERT (flight_size >= 0);
970 * Initial cwnd as per RFC5681
973 tcp_initial_cwnd (const tcp_connection_t * tc)
975 if (tcp_cfg.initial_cwnd_multiplier > 0)
976 return tcp_cfg.initial_cwnd_multiplier * tc->snd_mss;
978 if (tc->snd_mss > 2190)
979 return 2 * tc->snd_mss;
980 else if (tc->snd_mss > 1095)
981 return 3 * tc->snd_mss;
983 return 4 * tc->snd_mss;
987 * Accumulate acked bytes for cwnd increase
989 * Once threshold bytes are accumulated, snd_mss bytes are added
993 tcp_cwnd_accumulate (tcp_connection_t * tc, u32 thresh, u32 bytes)
995 tc->cwnd_acc_bytes += bytes;
996 if (tc->cwnd_acc_bytes >= thresh)
998 u32 inc = tc->cwnd_acc_bytes / thresh;
999 tc->cwnd_acc_bytes -= inc * thresh;
1000 tc->cwnd += inc * tc->snd_mss;
1001 tc->cwnd = clib_min (tc->cwnd, tc->tx_fifo_size);
1006 tcp_loss_wnd (const tcp_connection_t * tc)
1008 /* Whatever we have in flight + the packet we're about to send */
1009 return tcp_flight_size (tc) + tc->snd_mss;
1013 tcp_available_snd_wnd (const tcp_connection_t * tc)
1015 return clib_min (tc->cwnd, tc->snd_wnd);
1019 tcp_available_output_snd_space (const tcp_connection_t * tc)
1021 u32 available_wnd = tcp_available_snd_wnd (tc);
1022 int flight_size = (int) (tc->snd_nxt - tc->snd_una);
1024 if (available_wnd <= flight_size)
1027 return available_wnd - flight_size;
1031 * Estimate of how many bytes we can still push into the network
1034 tcp_available_cc_snd_space (const tcp_connection_t * tc)
1036 u32 available_wnd = tcp_available_snd_wnd (tc);
1037 u32 flight_size = tcp_flight_size (tc);
1039 if (available_wnd <= flight_size)
1042 return available_wnd - flight_size;
1046 tcp_is_descheduled (tcp_connection_t * tc)
1048 return (transport_connection_is_descheduled (&tc->connection) ? 1 : 0);
1052 tcp_is_lost_fin (tcp_connection_t * tc)
1054 if ((tc->flags & TCP_CONN_FINSNT) && (tc->snd_una_max - tc->snd_una == 1))
1059 u32 tcp_snd_space (tcp_connection_t * tc);
1060 int tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc);
1061 void tcp_reschedule (tcp_connection_t * tc);
1063 fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
1065 /* Made public for unit testing only */
1066 void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
1067 u32 tcp_sack_list_bytes (tcp_connection_t * tc);
1072 return tcp_main.wrk_ctx[vlib_get_thread_index ()].time_now;
1076 tcp_time_now_w_thread (u32 thread_index)
1078 return tcp_main.wrk_ctx[thread_index].time_now;
1082 * Generate timestamp for tcp connection
1085 tcp_tstamp (tcp_connection_t * tc)
1087 return (tcp_main.wrk_ctx[tc->c_thread_index].time_now -
1088 tc->timestamp_delta);
1092 tcp_time_now_us (u32 thread_index)
1094 return transport_time_now (thread_index);
1098 tcp_set_time_now (tcp_worker_ctx_t * wrk)
1100 wrk->time_now = clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
1101 return wrk->time_now;
1104 u32 tcp_session_push_header (transport_connection_t * tconn,
1106 int tcp_session_custom_tx (void *conn, u32 max_burst_size);
1108 void tcp_connection_timers_init (tcp_connection_t * tc);
1109 void tcp_connection_timers_reset (tcp_connection_t * tc);
1110 void tcp_init_snd_vars (tcp_connection_t * tc);
1111 void tcp_connection_init_vars (tcp_connection_t * tc);
1112 void tcp_connection_tx_pacer_update (tcp_connection_t * tc);
1113 void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
1115 void tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
1118 tcp_cc_rcv_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
1120 tc->cc_algo->rcv_ack (tc, rs);
1121 tc->tsecr_last_ack = tc->rcv_opts.tsecr;
1125 tcp_cc_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type,
1126 tcp_rate_sample_t * rs)
1128 tc->cc_algo->rcv_cong_ack (tc, ack_type, rs);
1132 tcp_cc_congestion (tcp_connection_t * tc)
1134 tc->cc_algo->congestion (tc);
1138 tcp_cc_loss (tcp_connection_t * tc)
1140 tc->cc_algo->loss (tc);
1144 tcp_cc_recovered (tcp_connection_t * tc)
1146 tc->cc_algo->recovered (tc);
1150 tcp_cc_undo_recovery (tcp_connection_t * tc)
1152 if (tc->cc_algo->undo_recovery)
1153 tc->cc_algo->undo_recovery (tc);
1157 tcp_cc_event (tcp_connection_t * tc, tcp_cc_event_t evt)
1159 if (tc->cc_algo->event)
1160 tc->cc_algo->event (tc, evt);
1164 tcp_cc_get_pacing_rate (tcp_connection_t * tc)
1166 if (tc->cc_algo->get_pacing_rate)
1167 return tc->cc_algo->get_pacing_rate (tc);
1169 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1171 /* TODO should constrain to interface's max throughput but
1172 * we don't have link speeds for sw ifs ..*/
1173 return ((f64) tc->cwnd / srtt);
1177 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
1179 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
1180 ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID);
1181 tc->timers[timer_id] =
1182 tw_timer_start_16t_2w_512sl (&tcp_main.
1183 wrk_ctx[tc->c_thread_index].timer_wheel,
1184 tc->c_c_index, timer_id, interval);
1188 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
1190 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
1191 if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
1194 tw_timer_stop_16t_2w_512sl (&tcp_main.
1195 wrk_ctx[tc->c_thread_index].timer_wheel,
1196 tc->timers[timer_id]);
1197 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
1201 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
1203 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
1204 if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
1205 tw_timer_update_16t_2w_512sl (&tcp_main.
1206 wrk_ctx[tc->c_thread_index].timer_wheel,
1207 tc->timers[timer_id], interval);
1209 tc->timers[timer_id] =
1210 tw_timer_start_16t_2w_512sl (&tcp_main.
1211 wrk_ctx[tc->c_thread_index].timer_wheel,
1212 tc->c_c_index, timer_id, interval);
1216 tcp_retransmit_timer_set (tcp_connection_t * tc)
1218 ASSERT (tc->snd_una != tc->snd_una_max);
1219 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
1220 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
1224 tcp_retransmit_timer_reset (tcp_connection_t * tc)
1226 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
1230 tcp_retransmit_timer_force_update (tcp_connection_t * tc)
1232 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
1233 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
1237 tcp_persist_timer_set (tcp_connection_t * tc)
1239 /* Reuse RTO. It's backed off in handler */
1240 tcp_timer_set (tc, TCP_TIMER_PERSIST,
1241 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
1245 tcp_persist_timer_update (tcp_connection_t * tc)
1249 if (seq_leq (tc->snd_una, tc->snd_congestion + tc->burst_acked))
1252 interval = clib_max (tc->rto * TCP_TO_TIMER_TICK, 1);
1254 tcp_timer_update (tc, TCP_TIMER_PERSIST, interval);
1258 tcp_persist_timer_reset (tcp_connection_t * tc)
1260 tcp_timer_reset (tc, TCP_TIMER_PERSIST);
1264 tcp_retransmit_timer_update (tcp_connection_t * tc)
1266 if (tc->snd_una == tc->snd_nxt)
1268 tcp_retransmit_timer_reset (tc);
1269 if (tc->snd_wnd < tc->snd_mss)
1270 tcp_persist_timer_update (tc);
1273 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
1274 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
1278 tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
1280 return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
1283 #define tcp_validate_txf_size(_tc, _a) \
1284 ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
1285 || transport_max_tx_dequeue (&_tc->connection) >= _a)
1287 void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
1288 u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose);
1291 * Register exiting cc algo type
1293 void tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
1294 const tcp_cc_algorithm_t * vft);
1297 * Register new cc algo type
1299 tcp_cc_algorithm_type_e tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft);
1300 tcp_cc_algorithm_t *tcp_cc_algo_get (tcp_cc_algorithm_type_e type);
1302 static inline void *
1303 tcp_cc_data (tcp_connection_t * tc)
1305 return (void *) tc->cc_data;
1308 void newreno_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type,
1309 tcp_rate_sample_t * rs);
1311 * Initialize connection by gleaning network and rcv params from buffer
1313 * @param tc connection to initialize
1314 * @param b buffer whose current data is pointing at ip
1315 * @param is_ip4 flag set to 1 if using ip4
1317 void tcp_init_w_buffer (tcp_connection_t * tc, vlib_buffer_t * b, u8 is_ip4);
1320 * Push TCP header to buffer
1322 * @param vm - vlib_main
1323 * @param b - buffer to write the header to
1324 * @param sp_net - source port net order
1325 * @param dp_net - destination port net order
1326 * @param seq - sequence number net order
1327 * @param ack - ack number net order
1328 * @param tcp_hdr_opts_len - header and options length in bytes
1329 * @param flags - header flags
1330 * @param wnd - window size
1332 * @return - pointer to start of TCP header
1334 always_inline void *
1335 vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq,
1336 u32 ack, u8 tcp_hdr_opts_len, u8 flags,
1341 th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
1345 th->seq_number = seq;
1346 th->ack_number = ack;
1347 th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
1351 th->urgent_pointer = 0;
1352 vnet_buffer (b)->l4_hdr_offset = (u8 *) th - b->data;
1353 b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID;
1358 * Push TCP header to buffer
1360 * @param b - buffer to write the header to
1361 * @param sp_net - source port net order
1362 * @param dp_net - destination port net order
1363 * @param seq - sequence number host order
1364 * @param ack - ack number host order
1365 * @param tcp_hdr_opts_len - header and options length in bytes
1366 * @param flags - header flags
1367 * @param wnd - window size
1369 * @return - pointer to start of TCP header
1371 always_inline void *
1372 vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
1373 u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
1375 return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
1376 clib_host_to_net_u32 (seq),
1377 clib_host_to_net_u32 (ack),
1378 tcp_hdr_opts_len, flags,
1379 clib_host_to_net_u16 (wnd));
1382 #endif /* _vnet_tcp_h_ */
1385 * fd.io coding-style-patch-verification: ON
1388 * eval: (c-set-style "gnu")