Include dependency graph for tcp.h:

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Data Structures
struct	tcp_worker_ctx_

struct	tcp_iss_seed_

Macros
#define	TCP_TICK 0.001
	TCP tick period (s) More...

#define	THZ (u32) (1/TCP_TICK)
	TCP tick frequency. More...

#define	TCP_TSTAMP_RESOLUTION TCP_TICK
	Time stamp resolution. More...

#define	TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ
	24 days More...

#define	TCP_FIB_RECHECK_PERIOD 1 * THZ
	Recheck every 1s. More...

#define	TCP_MAX_OPTION_SPACE 40

#define	TCP_CC_DATA_SZ 24

#define	TCP_DUPACK_THRESHOLD 3

#define	TCP_MAX_RX_FIFO_SIZE 32 << 20

#define	TCP_MIN_RX_FIFO_SIZE 4 << 10

#define	TCP_IW_N_SEGMENTS 10

#define	TCP_ALWAYS_ACK 1
	On/off delayed acks. More...

#define	TCP_USE_SACKS 1
	Disable only for testing. More...

#define	foreach_tcp_fsm_state
	TCP FSM state definitions as per RFC793. More...

#define	foreach_tcp_timer
	TCP timers. More...

#define	TCP_TIMER_HANDLE_INVALID ((u32) ~0)

#define	TCP_TO_TIMER_TICK

#define	TCP_DELACK_TIME 1 /* 0.1s */

#define	TCP_ESTABLISH_TIME 750 /* 75s */

#define	TCP_SYN_RCVD_TIME 600 /* 60s */

#define	TCP_2MSL_TIME 300 /* 30s */

#define	TCP_CLOSEWAIT_TIME 20 /* 2s */

#define	TCP_TIMEWAIT_TIME 100 /* 10s */

#define	TCP_FINWAIT1_TIME 600 /* 60s */

#define	TCP_CLEANUP_TIME 1 /* 0.1s */

#define	TCP_TIMER_PERSIST_MIN 2 /* 0.2s */

#define	TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */

#define	TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */

#define	TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */

#define	TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */

#define	TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */

#define	foreach_tcp_connection_flag
	TCP connection flags. More...

#define	TCP_SCOREBOARD_TRACE (0)

#define	TCP_MAX_SACK_BLOCKS 256
	Max number of SACK blocks stored. More...

#define	TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)

#define	tcp_scoreboard_trace_add(_tc, _ack)

#define	tcp_fastrecovery_on(tc) (tc)->flags \|= TCP_CONN_FAST_RECOVERY

#define	tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY

#define	tcp_recovery_on(tc) (tc)->flags \|= TCP_CONN_RECOVERY

#define	tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY

#define	tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)

#define	tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))

#define	tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)

#define	tcp_disconnect_pending(tc) ((tc)->flags & TCP_CONN_DCNT_PENDING)

#define	tcp_disconnect_pending_on(tc) ((tc)->flags \|= TCP_CONN_DCNT_PENDING)

#define	tcp_disconnect_pending_off(tc) ((tc)->flags &= ~TCP_CONN_DCNT_PENDING)

#define	tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST)

#define	tcp_fastrecovery_first_on(tc) ((tc)->flags \|= TCP_CONN_FRXT_FIRST)

#define	tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST)

#define	tcp_in_cong_recovery(tc)

#define	tcp_error(n, s) TCP_ERROR_##n,

#define	tcp_trajectory_add_start(b, start)

#define	seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)

#define	seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)

#define	seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)

#define	seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)

#define	seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))

#define	timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)

#define	timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)

#define	tcp_validate_txf_size(_tc, _a)

Typedefs
typedef enum _tcp_state	tcp_state_t

typedef enum _tcp_timers	tcp_timers_e

typedef void(	timer_expiration_handler) (u32 index)

typedef enum _tcp_connection_flag_bits	tcp_connection_flag_bits_e

typedef enum _tcp_connection_flag	tcp_connection_flags_e

typedef struct _scoreboard_trace_elt	scoreboard_trace_elt_t

typedef struct _sack_scoreboard_hole	sack_scoreboard_hole_t

typedef struct _sack_scoreboard	sack_scoreboard_t

typedef enum _tcp_cc_algorithm_type	tcp_cc_algorithm_type_e

typedef struct _tcp_cc_algorithm	tcp_cc_algorithm_t

typedef enum _tcp_cc_ack_t	tcp_cc_ack_t

typedef struct _tcp_connection	tcp_connection_t

typedef enum _tcp_error	tcp_error_t

typedef struct _tcp_lookup_dispatch	tcp_lookup_dispatch_t

typedef struct tcp_worker_ctx_	tcp_worker_ctx_t

typedef struct tcp_iss_seed_	tcp_iss_seed_t

typedef struct _tcp_main	tcp_main_t

Functions
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. More...

sack_scoreboard_hole_t *	scoreboard_get_hole (sack_scoreboard_t *sb, u32 index)

sack_scoreboard_hole_t *	scoreboard_next_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

sack_scoreboard_hole_t *	scoreboard_prev_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

sack_scoreboard_hole_t *	scoreboard_first_hole (sack_scoreboard_t *sb)

sack_scoreboard_hole_t *	scoreboard_last_hole (sack_scoreboard_t *sb)

void	scoreboard_clear (sack_scoreboard_t *sb)

void	scoreboard_init (sack_scoreboard_t *sb)

u8 *	format_tcp_scoreboard (u8 s, va_list args)

static void	tcp_cong_recovery_off (tcp_connection_t *tc)

static tcp_main_t *	vnet_get_tcp_main ()

static tcp_worker_ctx_t *	tcp_get_worker (u32 thread_index)

static tcp_header_t *	tcp_buffer_hdr (vlib_buffer_t *b)

clib_error_t *	vnet_tcp_enable_disable (vlib_main_t *vm, u8 is_en)

void	tcp_punt_unknown (vlib_main_t *vm, u8 is_ip4, u8 is_add)

static tcp_connection_t *	tcp_connection_get (u32 conn_index, u32 thread_index)

static tcp_connection_t *	tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)

static tcp_connection_t *	tcp_get_connection_from_transport (transport_connection_t *tconn)

static void	tcp_connection_set_state (tcp_connection_t *tc, tcp_state_t state)

void	tcp_connection_close (tcp_connection_t *tc)
	Begin connection closing procedure. More...

void	tcp_connection_cleanup (tcp_connection_t *tc)
	Cleans up connection state. More...

void	tcp_connection_del (tcp_connection_t *tc)
	Connection removal. More...

int	tcp_half_open_connection_cleanup (tcp_connection_t *tc)
	Try to cleanup half-open connection. More...

tcp_connection_t *	tcp_connection_alloc (u8 thread_index)

void	tcp_connection_free (tcp_connection_t *tc)

void	tcp_connection_reset (tcp_connection_t *tc)
	Notify session that connection has been reset. More...

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. More...

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. More...

void	tcp_api_reference (void)

u8 *	format_tcp_connection (u8 s, va_list args)

static tcp_connection_t *	tcp_listener_get (u32 tli)

static tcp_connection_t *	tcp_half_open_connection_get (u32 conn_index)

void	tcp_make_fin (tcp_connection_t tc, vlib_buffer_t b)
	Convert buffer to FIN-ACK. More...

void	tcp_make_synack (tcp_connection_t ts, vlib_buffer_t b)
	Convert buffer to SYN-ACK. More...

void	tcp_send_reset_w_pkt (tcp_connection_t tc, vlib_buffer_t pkt, u32 thread_index, u8 is_ip4)
	Send reset without reusing existing buffer. More...

void	tcp_send_reset (tcp_connection_t *tc)
	Build and set reset packet for connection. More...

void	tcp_send_syn (tcp_connection_t *tc)
	Send SYN. More...

void	tcp_send_synack (tcp_connection_t *tc)

void	tcp_send_fin (tcp_connection_t *tc)
	Send FIN. More...

void	tcp_init_mss (tcp_connection_t *tc)

void	tcp_update_burst_snd_vars (tcp_connection_t *tc)
	Update burst send vars. More...

void	tcp_update_rto (tcp_connection_t *tc)

void	tcp_flush_frame_to_output (tcp_worker_ctx_t *wrk, u8 is_ip4)
	Flush tx frame populated by retransmits and timer pops. More...

void	tcp_flush_frames_to_output (tcp_worker_ctx_t *wrk)
	Flush v4 and v6 tcp and ip-lookup tx frames for thread index. More...

void	tcp_program_fastretransmit (tcp_worker_ctx_t wrk, tcp_connection_t tc)

void	tcp_do_fastretransmits (tcp_worker_ctx_t *wrk)

void	tcp_program_ack (tcp_worker_ctx_t wrk, tcp_connection_t tc)

void	tcp_program_dupack (tcp_worker_ctx_t wrk, tcp_connection_t tc)

void	tcp_send_acks (tcp_worker_ctx_t *wrk)

static u32	tcp_end_seq (tcp_header_t *th, u32 len)

static u32	tcp_bytes_out (const tcp_connection_t *tc)
	Our estimate of the number of bytes that have left the network. More...

static u32	tcp_flight_size (const tcp_connection_t *tc)
	Our estimate of the number of bytes in flight (pipe size) More...

static u32	tcp_initial_cwnd (const tcp_connection_t *tc)
	Initial cwnd as per RFC5681. More...

static void	tcp_cwnd_accumulate (tcp_connection_t *tc, u32 thresh, u32 bytes)

static u32	tcp_loss_wnd (const tcp_connection_t *tc)

static u32	tcp_available_snd_wnd (const tcp_connection_t *tc)

static u32	tcp_available_output_snd_space (const tcp_connection_t *tc)

static u32	tcp_available_cc_snd_space (const tcp_connection_t *tc)
	Estimate of how many bytes we can still push into the network. More...

static u8	tcp_is_lost_fin (tcp_connection_t *tc)

u32	tcp_snd_space (tcp_connection_t *tc)

int	tcp_retransmit_first_unacked (tcp_worker_ctx_t wrk, tcp_connection_t tc)
	Retransmit first unacked segment. More...

int	tcp_fast_retransmit_no_sack (tcp_worker_ctx_t wrk, tcp_connection_t tc, u32 burst_size)
	Fast retransmit without SACK info. More...

int	tcp_fast_retransmit_sack (tcp_worker_ctx_t wrk, tcp_connection_t tc, u32 burst_size)
	Do fast retransmit with SACKs. More...

int	tcp_fast_retransmit (tcp_worker_ctx_t wrk, tcp_connection_t tc, u32 burst_size)
	Do fast retransmit. More...

void	tcp_cc_init_congestion (tcp_connection_t *tc)
	Init loss recovery/fast recovery. More...

void	tcp_cc_fastrecovery_exit (tcp_connection_t *tc)

fib_node_index_t	tcp_lookup_rmt_in_fib (tcp_connection_t *tc)

void	tcp_update_sack_list (tcp_connection_t *tc, u32 start, u32 end)
	Build SACK list as per RFC2018. More...

u32	tcp_sack_list_bytes (tcp_connection_t *tc)

static u32	tcp_time_now (void)

static u32	tcp_time_now_w_thread (u32 thread_index)

static f64	tcp_time_now_us (u32 thread_index)

static u32	tcp_set_time_now (tcp_worker_ctx_t *wrk)

u32	tcp_session_push_header (transport_connection_t tconn, vlib_buffer_t b)

void	tcp_connection_timers_init (tcp_connection_t *tc)
	Initialize all connection timers as invalid. More...

void	tcp_connection_timers_reset (tcp_connection_t *tc)
	Stop all connection timers. More...

void	tcp_init_snd_vars (tcp_connection_t *tc)
	Initialize connection send variables. More...

void	tcp_connection_init_vars (tcp_connection_t *tc)
	Initialize tcp connection variables. More...

void	tcp_connection_tx_pacer_update (tcp_connection_t *tc)

void	tcp_connection_tx_pacer_reset (tcp_connection_t *tc, u32 window, u32 start_bucket)

static void	tcp_cc_rcv_ack (tcp_connection_t *tc)

static void	tcp_timer_set (tcp_connection_t *tc, u8 timer_id, u32 interval)

static void	tcp_timer_reset (tcp_connection_t *tc, u8 timer_id)

static void	tcp_timer_update (tcp_connection_t *tc, u8 timer_id, u32 interval)

static void	tcp_retransmit_timer_set (tcp_connection_t *tc)

static void	tcp_retransmit_timer_reset (tcp_connection_t *tc)

static void	tcp_retransmit_timer_force_update (tcp_connection_t *tc)

static void	tcp_persist_timer_set (tcp_connection_t *tc)

static void	tcp_persist_timer_update (tcp_connection_t *tc)

static void	tcp_persist_timer_reset (tcp_connection_t *tc)

static void	tcp_retransmit_timer_update (tcp_connection_t *tc)

static u8	tcp_timer_is_active (tcp_connection_t *tc, tcp_timers_e timer)

void	tcp_rcv_sacks (tcp_connection_t *tc, u32 ack)

u8 *	tcp_scoreboard_replay (u8 s, tcp_connection_t tc, u8 verbose)

void	tcp_cc_algo_register (tcp_cc_algorithm_type_e type, const tcp_cc_algorithm_t *vft)

tcp_cc_algorithm_t *	tcp_cc_algo_get (tcp_cc_algorithm_type_e type)

static void *	tcp_cc_data (tcp_connection_t *tc)

void	newreno_rcv_cong_ack (tcp_connection_t *tc, tcp_cc_ack_t ack_type)

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. More...

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. More...

Variables
format_function_t	format_tcp_state

format_function_t	format_tcp_flags

format_function_t	format_tcp_sacks

format_function_t	format_tcp_rcv_sacks

timer_expiration_handler	tcp_timer_delack_handler

timer_expiration_handler	tcp_timer_retransmit_handler

timer_expiration_handler	tcp_timer_persist_handler

timer_expiration_handler	tcp_timer_retransmit_syn_handler

tcp_main_t	tcp_main

vlib_node_registration_t	tcp4_input_node
	(constructor) VLIB_REGISTER_NODE (tcp4_input_node) More...

vlib_node_registration_t	tcp6_input_node
	(constructor) VLIB_REGISTER_NODE (tcp6_input_node) More...

vlib_node_registration_t	tcp4_output_node
	(constructor) VLIB_REGISTER_NODE (tcp4_output_node) More...

vlib_node_registration_t	tcp6_output_node
	(constructor) VLIB_REGISTER_NODE (tcp6_output_node) More...

vlib_node_registration_t	tcp4_established_node
	(constructor) VLIB_REGISTER_NODE (tcp4_established_node) More...

vlib_node_registration_t	tcp6_established_node
	(constructor) VLIB_REGISTER_NODE (tcp6_established_node) More...

vlib_node_registration_t	tcp4_syn_sent_node
	(constructor) VLIB_REGISTER_NODE (tcp4_syn_sent_node) More...

vlib_node_registration_t	tcp6_syn_sent_node
	(constructor) VLIB_REGISTER_NODE (tcp6_syn_sent_node) More...

vlib_node_registration_t	tcp4_rcv_process_node
	(constructor) VLIB_REGISTER_NODE (tcp4_rcv_process_node) More...

vlib_node_registration_t	tcp6_rcv_process_node
	(constructor) VLIB_REGISTER_NODE (tcp6_rcv_process_node) More...

vlib_node_registration_t	tcp4_listen_node
	(constructor) VLIB_REGISTER_NODE (tcp4_listen_node) More...

vlib_node_registration_t	tcp6_listen_node
	(constructor) VLIB_REGISTER_NODE (tcp6_listen_node) More...

Macro Definition Documentation

#define foreach_tcp_connection_flag

Value:

_(SNDACK, "Send ACK")                         \
  _(FINSNT, "FIN sent")                         \
  _(RECOVERY, "Recovery")                       \
  _(FAST_RECOVERY, "Fast Recovery")             \
  _(DCNT_PENDING, "Disconnect pending")         \
  _(HALF_OPEN_DONE, "Half-open completed")      \
  _(FINPNDG, "FIN pending")                     \
  _(FRXT_PENDING, "Fast-retransmit pending")    \
  _(FRXT_FIRST, "Fast-retransmit first again")  \
  _(DEQ_PENDING, "Pending dequeue acked")       \
  _(PSH_PENDING, "PSH pending")                 \
  _(FINRCVD, "FIN received")                    \

TCP connection flags.

Definition at line 117 of file tcp.h.

#define foreach_tcp_fsm_state

Value:

_(CLOSED, "CLOSED")           \
  _(LISTEN, "LISTEN")           \
  _(SYN_SENT, "SYN_SENT")       \
  _(SYN_RCVD, "SYN_RCVD")       \
  _(ESTABLISHED, "ESTABLISHED") \
  _(CLOSE_WAIT, "CLOSE_WAIT")   \
  _(FIN_WAIT_1, "FIN_WAIT_1")   \
  _(LAST_ACK, "LAST_ACK")       \
  _(CLOSING, "CLOSING")         \
  _(FIN_WAIT_2, "FIN_WAIT_2")   \
  _(TIME_WAIT, "TIME_WAIT")

TCP FSM state definitions as per RFC793.

Definition at line 43 of file tcp.h.

#define foreach_tcp_timer

Value:

_(RETRANSMIT, "RETRANSMIT")           \
  _(DELACK, "DELAYED ACK")              \
  _(PERSIST, "PERSIST")                 \
  _(KEEP, "KEEP")                       \
  _(WAITCLOSE, "WAIT CLOSE")            \
  _(RETRANSMIT_SYN, "RETRANSMIT SYN")   \
  _(ESTABLISH, "ESTABLISH")             \
  _(ESTABLISH_AO, "ESTABLISH_AO")       \

TCP timers.

Definition at line 70 of file tcp.h.

#define seq_geq	(	_s1,
		_s2
	)	((i32)((_s1)-(_s2)) >= 0)

Definition at line 642 of file tcp.h.

#define seq_gt	(	_s1,
		_s2
	)	((i32)((_s1)-(_s2)) > 0)

Definition at line 641 of file tcp.h.

#define seq_leq	(	_s1,
		_s2
	)	((i32)((_s1)-(_s2)) <= 0)

Definition at line 640 of file tcp.h.

#define seq_lt	(	_s1,
		_s2
	)	((i32)((_s1)-(_s2)) < 0)

Definition at line 639 of file tcp.h.

#define seq_max	(	_s1,
		_s2
	)	(seq_gt((_s1), (_s2)) ? (_s1) : (_s2))

Definition at line 643 of file tcp.h.

#define TCP_2MSL_TIME 300 /* 30s */

Definition at line 103 of file tcp.h.

#define TCP_ALWAYS_ACK 1

On/off delayed acks.

Definition at line 39 of file tcp.h.

#define TCP_CC_DATA_SZ 24

Definition at line 33 of file tcp.h.

#define TCP_CLEANUP_TIME 1 /* 0.1s */

Definition at line 107 of file tcp.h.

#define TCP_CLOSEWAIT_TIME 20 /* 2s */

Definition at line 104 of file tcp.h.

#define TCP_DELACK_TIME 1 /* 0.1s */

Definition at line 100 of file tcp.h.

#define tcp_disconnect_pending ( tc ) ((tc)->flags & TCP_CONN_DCNT_PENDING)

Definition at line 346 of file tcp.h.

#define tcp_disconnect_pending_off ( tc ) ((tc)->flags &= ~TCP_CONN_DCNT_PENDING)

Definition at line 348 of file tcp.h.

#define tcp_disconnect_pending_on ( tc ) ((tc)->flags |= TCP_CONN_DCNT_PENDING)

Definition at line 347 of file tcp.h.

#define TCP_DUPACK_THRESHOLD 3

Definition at line 35 of file tcp.h.

#define tcp_error	(	n,
		s
	)	TCP_ERROR_##n,

Definition at line 365 of file tcp.h.

#define TCP_ESTABLISH_TIME 750 /* 75s */

Definition at line 101 of file tcp.h.

#define tcp_fastrecovery_first ( tc ) ((tc)->flags & TCP_CONN_FRXT_FIRST)

Definition at line 349 of file tcp.h.

#define tcp_fastrecovery_first_off ( tc ) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST)

Definition at line 351 of file tcp.h.

#define tcp_fastrecovery_first_on ( tc ) ((tc)->flags |= TCP_CONN_FRXT_FIRST)

Definition at line 350 of file tcp.h.

#define tcp_fastrecovery_off ( tc ) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY

Definition at line 340 of file tcp.h.

#define tcp_fastrecovery_on ( tc ) (tc)->flags |= TCP_CONN_FAST_RECOVERY

Definition at line 339 of file tcp.h.

#define TCP_FIB_RECHECK_PERIOD 1 * THZ

Recheck every 1s.

Definition at line 31 of file tcp.h.

#define TCP_FINWAIT1_TIME 600 /* 60s */

Definition at line 106 of file tcp.h.

#define tcp_in_cong_recovery ( tc )

Value:

((tc)->flags & \

(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))

flags

u32 flags

Definition: vhost_user.h:115

Definition at line 353 of file tcp.h.

#define tcp_in_fastrecovery ( tc ) ((tc)->flags & TCP_CONN_FAST_RECOVERY)

Definition at line 343 of file tcp.h.

#define tcp_in_recovery ( tc ) ((tc)->flags & (TCP_CONN_RECOVERY))

Definition at line 344 of file tcp.h.

#define tcp_in_slowstart ( tc ) (tc->cwnd < tc->ssthresh)

Definition at line 345 of file tcp.h.

#define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)

Definition at line 149 of file tcp.h.

#define TCP_IW_N_SEGMENTS 10

Definition at line 38 of file tcp.h.

#define TCP_MAX_OPTION_SPACE 40

Definition at line 32 of file tcp.h.

#define TCP_MAX_RX_FIFO_SIZE 32 << 20

Definition at line 36 of file tcp.h.

#define TCP_MAX_SACK_BLOCKS 256

Max number of SACK blocks stored.

Definition at line 148 of file tcp.h.

#define TCP_MIN_RX_FIFO_SIZE 4 << 10

Definition at line 37 of file tcp.h.

#define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ

24 days

Definition at line 30 of file tcp.h.

#define tcp_recovery_off ( tc ) (tc)->flags &= ~TCP_CONN_RECOVERY

Definition at line 342 of file tcp.h.

#define tcp_recovery_on ( tc ) (tc)->flags |= TCP_CONN_RECOVERY

Definition at line 341 of file tcp.h.

#define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */

Definition at line 114 of file tcp.h.

#define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */

Definition at line 110 of file tcp.h.

#define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */

Definition at line 111 of file tcp.h.

#define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */

Definition at line 113 of file tcp.h.

#define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */

Definition at line 112 of file tcp.h.

#define TCP_SCOREBOARD_TRACE (0)

Definition at line 147 of file tcp.h.

#define tcp_scoreboard_trace_add	(	_tc,
		_ack
	)

Definition at line 212 of file tcp.h.

#define TCP_SYN_RCVD_TIME 600 /* 60s */

Definition at line 102 of file tcp.h.

#define TCP_TICK 0.001

TCP tick period (s)

Definition at line 27 of file tcp.h.

#define TCP_TIMER_HANDLE_INVALID ((u32) ~0)

Definition at line 95 of file tcp.h.

#define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */

Definition at line 108 of file tcp.h.

#define TCP_TIMEWAIT_TIME 100 /* 10s */

Definition at line 105 of file tcp.h.

#define TCP_TO_TIMER_TICK

Value:

TCP_TICK*10 /* Period for converting from TCP

* ticks to timer units */

TCP_TICK

#define TCP_TICK

TCP tick period (s)

Definition: tcp.h:27

Definition at line 98 of file tcp.h.

#define tcp_trajectory_add_start	(	b,
		start
	)

Definition at line 539 of file tcp.h.

#define TCP_TSTAMP_RESOLUTION TCP_TICK

Time stamp resolution.

Definition at line 29 of file tcp.h.

#define TCP_USE_SACKS 1

Disable only for testing.

Definition at line 40 of file tcp.h.

#define tcp_validate_txf_size	(	_tc,
		_a
	)

Value:

ASSERT(_tc->state != TCP_STATE_ESTABLISHED \

|| transport_max_tx_dequeue (&_tc->connection) >= _a)

transport_max_tx_dequeue

static u32 transport_max_tx_dequeue(transport_connection_t *tc)

Definition: session.h:385

ASSERT

#define ASSERT(truth)

Definition: error_bootstrap.h:69

Definition at line 930 of file tcp.h.

#define THZ (u32) (1/TCP_TICK)

TCP tick frequency.

Definition at line 28 of file tcp.h.

#define timestamp_leq	(	_t1,
		_t2
	)	((i32)((_t1)-(_t2)) <= 0)

Definition at line 647 of file tcp.h.

#define timestamp_lt	(	_t1,
		_t2
	)	((i32)((_t1)-(_t2)) < 0)

Definition at line 646 of file tcp.h.

Typedef Documentation

typedef struct _sack_scoreboard_hole sack_scoreboard_hole_t

typedef struct _sack_scoreboard sack_scoreboard_t

typedef struct _scoreboard_trace_elt scoreboard_trace_elt_t

typedef enum _tcp_cc_ack_t tcp_cc_ack_t

typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t

Definition at line 239 of file tcp.h.

typedef enum _tcp_cc_algorithm_type tcp_cc_algorithm_type_e

typedef enum _tcp_connection_flag_bits tcp_connection_flag_bits_e

typedef enum _tcp_connection_flag tcp_connection_flags_e

typedef struct _tcp_connection tcp_connection_t

typedef enum _tcp_error tcp_error_t

typedef struct tcp_iss_seed_ tcp_iss_seed_t

typedef struct _tcp_lookup_dispatch tcp_lookup_dispatch_t

typedef struct _tcp_main tcp_main_t

typedef enum _tcp_state tcp_state_t

typedef enum _tcp_timers tcp_timers_e

typedef struct tcp_worker_ctx_ tcp_worker_ctx_t

typedef void( timer_expiration_handler) (u32 index)

Definition at line 88 of file tcp.h.

Function Documentation

u8* format_tcp_connection	(	u8 *	s,
		va_list *	args
	)

Definition at line 906 of file tcp.c.

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u8* format_tcp_scoreboard	(	u8 *	s,
		va_list *	args
	)

Definition at line 1021 of file tcp.c.

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void newreno_rcv_cong_ack	(	tcp_connection_t *	tc,
		tcp_cc_ack_t	ack_type
	)

Definition at line 45 of file tcp_newreno.c.

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void scoreboard_clear ( sack_scoreboard_t * sb )

Definition at line 900 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_first_hole ( sack_scoreboard_t * sb )

Definition at line 682 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_get_hole	(	sack_scoreboard_t *	sb,
		u32	index
	)

Definition at line 658 of file tcp_input.c.

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void scoreboard_init ( sack_scoreboard_t * sb )

Definition at line 892 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_last_hole ( sack_scoreboard_t * sb )

Definition at line 690 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_next_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

Definition at line 666 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_next_rxt_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	start,
		u8	have_unsent,
		u8 *	can_rescue,
		u8 *	snd_limited
	)

Figure out the next hole to retransmit.

Follows logic proposed in RFC6675 Sec. 4, NextSeg()

Definition at line 822 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_prev_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

Definition at line 674 of file tcp_input.c.

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void tcp_api_reference ( void )

Definition at line 109 of file tcp_api.c.

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static u32 tcp_available_cc_snd_space ( const tcp_connection_t * tc )

inlinestatic

Estimate of how many bytes we can still push into the network.

Definition at line 747 of file tcp.h.

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static u32 tcp_available_output_snd_space ( const tcp_connection_t * tc )

inlinestatic

Definition at line 732 of file tcp.h.

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static u32 tcp_available_snd_wnd ( const tcp_connection_t * tc )

inlinestatic

Definition at line 726 of file tcp.h.

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static tcp_header_t* tcp_buffer_hdr ( vlib_buffer_t * b )

inlinestatic

Definition at line 526 of file tcp.h.

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static u32 tcp_bytes_out ( const tcp_connection_t * tc )

inlinestatic

Our estimate of the number of bytes that have left the network.

Definition at line 653 of file tcp.h.

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tcp_cc_algorithm_t* tcp_cc_algo_get ( tcp_cc_algorithm_type_e type )

Definition at line 567 of file tcp.c.

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void tcp_cc_algo_register	(	tcp_cc_algorithm_type_e	type,
		const tcp_cc_algorithm_t *	vft
	)

Definition at line 556 of file tcp.c.

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static void* tcp_cc_data ( tcp_connection_t * tc )

inlinestatic

Definition at line 943 of file tcp.h.

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void tcp_cc_fastrecovery_exit ( tcp_connection_t * tc )

Definition at line 1187 of file tcp_input.c.

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void tcp_cc_init_congestion ( tcp_connection_t * tc )

Init loss recovery/fast recovery.

Triggered by dup acks as opposed to timer timeout. Note that cwnd is updated in tcp_cc_handle_event after fast retransmit

Definition at line 1161 of file tcp_input.c.

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static void tcp_cc_rcv_ack ( tcp_connection_t * tc )

inlinestatic

Definition at line 821 of file tcp.h.

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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.

Parameters

vm	vlib_main_t pointer
start	first ipv4 address in the source address range
end	last ipv4 address in the source address range
table_id	VRF / table ID, 0 for the default FIB

Returns: 0 if all OK, else an error indication from api_errno.h

Definition at line 1649 of file tcp.c.

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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.

Parameters

vm	vlib_main_t pointer
start	first ipv6 address in the source address range
end	last ipv6 address in the source address range
table_id	VRF / table ID, 0 for the default FIB

Returns: 0 if all OK, else an error indication from api_errno.h

Definition at line 1741 of file tcp.c.

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static void tcp_cong_recovery_off ( tcp_connection_t * tc )

inlinestatic

Definition at line 357 of file tcp.h.

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tcp_connection_t* tcp_connection_alloc ( u8 thread_index )

Definition at line 253 of file tcp.c.

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void tcp_connection_cleanup ( tcp_connection_t * tc )

Cleans up connection state.

No notifications.

Definition at line 199 of file tcp.c.

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void tcp_connection_close ( tcp_connection_t * tc )

Begin connection closing procedure.

If at the end the connection is not in CLOSED state, it is not removed. Instead, we rely on on TCP to advance through state machine to either 1) LAST_ACK (passive close) whereby when the last ACK is received tcp_connection_del is called. This notifies session of the delete and calls cleanup. 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers and cleanup is called.

N.B. Half-close connections are not supported

Definition at line 340 of file tcp.c.

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void tcp_connection_del ( tcp_connection_t * tc )

Connection removal.

This should be called only once connection enters CLOSED state. Note that it notifies the session of the removal event, so if the goal is to just remove the connection, call tcp_connection_cleanup instead.

Definition at line 246 of file tcp.c.

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void tcp_connection_free ( tcp_connection_t * tc )

Definition at line 266 of file tcp.c.

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static tcp_connection_t* tcp_connection_get	(	u32	conn_index,
		u32	thread_index
	)

inlinestatic

Definition at line 547 of file tcp.h.

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static tcp_connection_t* tcp_connection_get_if_valid	(	u32	conn_index,
		u32	thread_index
	)

inlinestatic

Definition at line 556 of file tcp.h.

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void tcp_connection_init_vars ( tcp_connection_t * tc )

Initialize tcp connection variables.

Should be called after having received a msg from the peer, i.e., a SYN or a SYNACK, such that connection options have already been exchanged.

Definition at line 631 of file tcp.c.

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void tcp_connection_reset ( tcp_connection_t * tc )

Notify session that connection has been reset.

Switch state to closed and wait for session to call cleanup.

Definition at line 284 of file tcp.c.

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static void tcp_connection_set_state	(	tcp_connection_t *	tc,
		tcp_state_t	state
	)

inlinestatic

Definition at line 572 of file tcp.h.

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void tcp_connection_timers_init ( tcp_connection_t * tc )

Initialize all connection timers as invalid.

Definition at line 425 of file tcp.c.

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void tcp_connection_timers_reset ( tcp_connection_t * tc )

Stop all connection timers.

Definition at line 442 of file tcp.c.

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void tcp_connection_tx_pacer_reset	(	tcp_connection_t *	tc,
		u32	window,
		u32	start_bucket
	)

Definition at line 1229 of file tcp.c.

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void tcp_connection_tx_pacer_update ( tcp_connection_t * tc )

Definition at line 1213 of file tcp.c.

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static void tcp_cwnd_accumulate	(	tcp_connection_t *	tc,
		u32	thresh,
		u32	bytes
	)

inlinestatic

Definition at line 707 of file tcp.h.

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void tcp_do_fastretransmits ( tcp_worker_ctx_t * wrk )

Definition at line 1311 of file tcp_input.c.

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static u32 tcp_end_seq	(	tcp_header_t *	th,
		u32	len
	)

inlinestatic

Definition at line 633 of file tcp.h.

int tcp_fast_retransmit	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		u32	burst_size
	)

Do fast retransmit.

Definition at line 1947 of file tcp_output.c.

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int tcp_fast_retransmit_no_sack	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		u32	burst_size
	)

Fast retransmit without SACK info.

Definition at line 1883 of file tcp_output.c.

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int tcp_fast_retransmit_sack	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		u32	burst_size
	)

Do fast retransmit with SACKs.

Definition at line 1780 of file tcp_output.c.

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static u32 tcp_flight_size ( const tcp_connection_t * tc )

inlinestatic

Our estimate of the number of bytes in flight (pipe size)

Definition at line 665 of file tcp.h.

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void tcp_flush_frame_to_output	(	tcp_worker_ctx_t *	wrk,
		u8	is_ip4
	)

Flush tx frame populated by retransmits and timer pops.

Definition at line 982 of file tcp_output.c.

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void tcp_flush_frames_to_output ( tcp_worker_ctx_t * wrk )

Flush v4 and v6 tcp and ip-lookup tx frames for thread index.

Definition at line 1013 of file tcp_output.c.

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static tcp_connection_t* tcp_get_connection_from_transport ( transport_connection_t * tconn )

inlinestatic

Definition at line 566 of file tcp.h.

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static tcp_worker_ctx_t* tcp_get_worker ( u32 thread_index )

inlinestatic

Definition at line 520 of file tcp.h.

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int tcp_half_open_connection_cleanup ( tcp_connection_t * tc )

Try to cleanup half-open connection.

If called from a thread that doesn't own tc, the call won't have any effect.

Parameters

tc	- connection to be cleaned up

Returns: non-zero if cleanup failed.

Definition at line 170 of file tcp.c.

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static tcp_connection_t* tcp_half_open_connection_get ( u32 conn_index )

inlinestatic

Definition at line 601 of file tcp.h.

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void tcp_init_mss ( tcp_connection_t * tc )

Definition at line 428 of file tcp_output.c.

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void tcp_init_snd_vars ( tcp_connection_t * tc )

Initialize connection send variables.

Definition at line 598 of file tcp.c.

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static u32 tcp_initial_cwnd ( const tcp_connection_t * tc )

inlinestatic

Initial cwnd as per RFC5681.

Definition at line 690 of file tcp.h.

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static u8 tcp_is_lost_fin ( tcp_connection_t * tc )

inlinestatic

Definition at line 759 of file tcp.h.

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static tcp_connection_t* tcp_listener_get ( u32 tli )

inlinestatic

Definition at line 595 of file tcp.h.

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fib_node_index_t tcp_lookup_rmt_in_fib ( tcp_connection_t * tc )

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static u32 tcp_loss_wnd ( const tcp_connection_t * tc )

inlinestatic

Definition at line 720 of file tcp.h.

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void tcp_make_fin	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Convert buffer to FIN-ACK.

Definition at line 522 of file tcp_output.c.

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void tcp_make_synack	(	tcp_connection_t *	ts,
		vlib_buffer_t *	b
	)

Convert buffer to SYN-ACK.

Definition at line 556 of file tcp_output.c.

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static void tcp_persist_timer_reset ( tcp_connection_t * tc )

inlinestatic

Definition at line 905 of file tcp.h.

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static void tcp_persist_timer_set ( tcp_connection_t * tc )

inlinestatic

Definition at line 888 of file tcp.h.

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static void tcp_persist_timer_update ( tcp_connection_t * tc )

inlinestatic

Definition at line 897 of file tcp.h.

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void tcp_program_ack	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

Definition at line 1171 of file tcp_output.c.

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void tcp_program_dupack	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

Definition at line 1181 of file tcp_output.c.

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void tcp_program_fastretransmit	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

Definition at line 1301 of file tcp_input.c.

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void tcp_punt_unknown	(	vlib_main_t *	vm,
		u8	is_ip4,
		u8	is_add
	)

Definition at line 1516 of file tcp.c.

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void tcp_rcv_sacks	(	tcp_connection_t *	tc,
		u32	ack
	)

Definition at line 937 of file tcp_input.c.

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int tcp_retransmit_first_unacked	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

Retransmit first unacked segment.

Definition at line 1726 of file tcp_output.c.

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static void tcp_retransmit_timer_force_update ( tcp_connection_t * tc )

inlinestatic

Definition at line 881 of file tcp.h.

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static void tcp_retransmit_timer_reset ( tcp_connection_t * tc )

inlinestatic

Definition at line 875 of file tcp.h.

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static void tcp_retransmit_timer_set ( tcp_connection_t * tc )

inlinestatic

Definition at line 867 of file tcp.h.

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static void tcp_retransmit_timer_update ( tcp_connection_t * tc )

inlinestatic

Definition at line 911 of file tcp.h.

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u32 tcp_sack_list_bytes ( tcp_connection_t * tc )

Definition at line 1785 of file tcp_input.c.

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u8* tcp_scoreboard_replay	(	u8 *	s,
		tcp_connection_t *	tc,
		u8	verbose
	)

Definition at line 1965 of file tcp.c.

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void tcp_send_acks ( tcp_worker_ctx_t * wrk )

Definition at line 1193 of file tcp_output.c.

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void tcp_send_fin ( tcp_connection_t * tc )

Send FIN.

Definition at line 1025 of file tcp_output.c.

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void tcp_send_reset ( tcp_connection_t * tc )

Build and set reset packet for connection.

Definition at line 841 of file tcp_output.c.

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void tcp_send_reset_w_pkt	(	tcp_connection_t *	tc,
		vlib_buffer_t *	pkt,
		u32	thread_index,
		u8	is_ip4
	)

Send reset without reusing existing buffer.

It extracts connection info out of original packet

Definition at line 761 of file tcp_output.c.

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void tcp_send_syn ( tcp_connection_t * tc )

Send SYN.

Builds a SYN packet for a half-open connection and sends it to ipx_lookup. The packet is not forwarded through tcpx_output to avoid doing lookups in the half_open pool.

Definition at line 919 of file tcp_output.c.

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void tcp_send_synack ( tcp_connection_t * tc )

Definition at line 955 of file tcp_output.c.

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u32 tcp_session_push_header	(	transport_connection_t *	tconn,
		vlib_buffer_t *	b
	)

Definition at line 1129 of file tcp_output.c.

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static u32 tcp_set_time_now ( tcp_worker_ctx_t * wrk )

inlinestatic

Definition at line 803 of file tcp.h.

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u32 tcp_snd_space ( tcp_connection_t * tc )

Definition at line 1141 of file tcp.c.

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static u32 tcp_time_now ( void )

inlinestatic

Definition at line 785 of file tcp.h.

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static f64 tcp_time_now_us ( u32 thread_index )

inlinestatic

Definition at line 797 of file tcp.h.

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static u32 tcp_time_now_w_thread ( u32 thread_index )

inlinestatic

Definition at line 791 of file tcp.h.

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static u8 tcp_timer_is_active	(	tcp_connection_t *	tc,
		tcp_timers_e	timer
	)

inlinestatic

Definition at line 925 of file tcp.h.

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static void tcp_timer_reset	(	tcp_connection_t *	tc,
		u8	timer_id
	)

inlinestatic

Definition at line 839 of file tcp.h.

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static void tcp_timer_set	(	tcp_connection_t *	tc,
		u8	timer_id,
		u32	interval
	)

inlinestatic

Definition at line 828 of file tcp.h.

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static void tcp_timer_update	(	tcp_connection_t *	tc,
		u8	timer_id,
		u32	interval
	)

inlinestatic

Definition at line 852 of file tcp.h.

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void tcp_update_burst_snd_vars ( tcp_connection_t * tc )

Update burst send vars.

Updates snd_mss to reflect the effective segment size that we can send by taking into account all TCP options, including SACKs.
Cache 'on the wire' options for reuse
Updates receive window which can be reused for a burst.

This should only be called when doing bursts

Definition at line 408 of file tcp_output.c.

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void tcp_update_rto ( tcp_connection_t * tc )

Definition at line 465 of file tcp_input.c.

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void tcp_update_sack_list	(	tcp_connection_t *	tc,
		u32	start,
		u32	end
	)

Build SACK list as per RFC2018.

Makes sure the first block contains the segment that generated the current ACK and the following ones are the ones most recently reported in SACK blocks.

Parameters

tc	TCP connection for which the SACK list is updated
start	Start sequence number of the newest SACK block
end	End sequence of the newest SACK block

Definition at line 1736 of file tcp_input.c.

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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
	)

inlinestatic

Push TCP header to buffer.

Parameters

b	- buffer to write the header to
sp_net	- source port net order
dp_net	- destination port net order
seq	- sequence number host order
ack	- ack number host order
tcp_hdr_opts_len	- header and options length in bytes
flags	- header flags
wnd	- window size

Returns: - pointer to start of TCP header

Definition at line 1001 of file tcp.h.

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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
	)

inlinestatic

Push TCP header to buffer.

Parameters

vm	- vlib_main
b	- buffer to write the header to
sp_net	- source port net order
dp_net	- destination port net order
seq	- sequence number net order
ack	- ack number net order
tcp_hdr_opts_len	- header and options length in bytes
flags	- header flags
wnd	- window size