Include dependency graph for tcp.h:

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Data Structures
struct	tcp_wrk_stats_

struct	tcp_free_req_

struct	tcp_worker_ctx_

struct	tcp_iss_seed_

struct	tcp_configuration_

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

#define	foreach_tcp_wrk_stat

#define	tcp_worker_stats_inc(_wrk, _stat, _val) _wrk->stats._stat += _val

#define	tcp_cfg tcp_main.cfg

#define	tcp_node_index(node_id, is_ip4) ((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index)

#define	tcp_trajectory_add_start(b, start)

#define	tcp_validate_txf_size(_tc, _a)

Typedefs
typedef void()	timer_expiration_handler(tcp_connection_t *tc)

typedef enum _tcp_error	tcp_error_t

typedef struct _tcp_lookup_dispatch	tcp_lookup_dispatch_t

typedef struct tcp_wrk_stats_	tcp_wrk_stats_t

typedef struct tcp_free_req_	tcp_cleanup_req_t

typedef struct tcp_worker_ctx_	tcp_worker_ctx_t

typedef struct tcp_iss_seed_	tcp_iss_seed_t

typedef struct tcp_configuration_	tcp_configuration_t

typedef struct _tcp_main	tcp_main_t

Functions
static tcp_main_t *	vnet_get_tcp_main ()

static tcp_worker_ctx_t *	tcp_get_worker (u32 thread_index)

tcp_connection_t *	tcp_connection_alloc (u8 thread_index)

tcp_connection_t *	tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t *base)

void	tcp_connection_free (tcp_connection_t *tc)

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...

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_send_ack (tcp_connection_t *tc)

void	tcp_send_window_update_ack (tcp_connection_t *tc)
	Send window update ack. More...

void	tcp_program_ack (tcp_connection_t *tc)

void	tcp_program_dupack (tcp_connection_t *tc)

void	tcp_program_retransmit (tcp_connection_t *tc)

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

u32	tcp_snd_space (tcp_connection_t *tc)

int	tcp_fastrecovery_prr_snd_space (tcp_connection_t *tc)
	Estimate send space using proportional rate reduction (RFC6937) More...

void	tcp_reschedule (tcp_connection_t *tc)

fib_node_index_t	tcp_lookup_rmt_in_fib (tcp_connection_t *tc)

u32	tcp_session_push_header (transport_connection_t tconn, vlib_buffer_t b)

int	tcp_session_custom_tx (void conn, transport_send_params_t sp)

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)

void	tcp_program_cleanup (tcp_worker_ctx_t wrk, tcp_connection_t tc)

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

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...

clib_error_t *	vnet_tcp_enable_disable (vlib_main_t *vm, u8 is_en)

Variables
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...

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

format_function_t	format_tcp_connection

format_function_t	format_tcp_connection_id

Macro Definition Documentation

◆ foreach_tcp_wrk_stat

#define foreach_tcp_wrk_stat

Value:

_(timer_expirations, u64, "timer expirations")          \
  _(rxt_segs, u64, "segments retransmitted")                    \
  _(tr_events, u32, "timer retransmit events")                  \
  _(to_closewait, u32, "timeout close-wait")                    \
  _(to_closewait2, u32, "timeout close-wait w/data")            \
  _(to_finwait1, u32, "timeout fin-wait-1")                     \
  _(to_finwait2, u32, "timeout fin-wait-2")                     \
  _(to_lastack, u32, "timeout last-ack")                        \
  _(to_closing, u32, "timeout closing")                         \
  _(tr_abort, u32, "timer retransmit abort")                    \
  _(rst_unread, u32, "reset on close due to unread data")       \
  _(no_buffer, u32, "out of buffers")                           \

Definition at line 48 of file tcp.h.

◆ tcp_cfg

#define tcp_cfg tcp_main.cfg

Definition at line 271 of file tcp.h.

◆ tcp_error

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

Definition at line 37 of file tcp.h.

◆ tcp_node_index

#define tcp_node_index	(	node_id,
		is_ip4
	)	((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index)

Definition at line 272 of file tcp.h.

◆ tcp_trajectory_add_start

#define tcp_trajectory_add_start	(	b,
		start
	)

Definition at line 294 of file tcp.h.

◆ tcp_validate_txf_size

#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:509

ASSERT

#define ASSERT(truth)

Definition: error_bootstrap.h:69

Definition at line 354 of file tcp.h.

◆ tcp_worker_stats_inc

#define tcp_worker_stats_inc	(	_wrk,
		_stat,
		_val
	)	_wrk->stats._stat += _val

Definition at line 125 of file tcp.h.

Typedef Documentation

◆ tcp_cleanup_req_t

typedef struct tcp_free_req_ tcp_cleanup_req_t

◆ tcp_configuration_t

typedef struct tcp_configuration_ tcp_configuration_t

◆ tcp_error_t

typedef enum _tcp_error tcp_error_t

◆ tcp_iss_seed_t

typedef struct tcp_iss_seed_ tcp_iss_seed_t

◆ tcp_lookup_dispatch_t

typedef struct _tcp_lookup_dispatch tcp_lookup_dispatch_t

◆ tcp_main_t

typedef struct _tcp_main tcp_main_t

◆ tcp_worker_ctx_t

typedef struct tcp_worker_ctx_ tcp_worker_ctx_t

◆ tcp_wrk_stats_t

typedef struct tcp_wrk_stats_ tcp_wrk_stats_t

◆ timer_expiration_handler

typedef void() timer_expiration_handler(tcp_connection_t *tc)

Definition at line 29 of file tcp.h.

Function Documentation

◆ tcp_configure_v4_source_address_range()

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 377 of file tcp_cli.c.

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◆ tcp_configure_v6_source_address_range()

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 464 of file tcp_cli.c.

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◆ tcp_connection_alloc()

tcp_connection_t* tcp_connection_alloc ( u8 thread_index )

Definition at line 296 of file tcp.c.

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◆ tcp_connection_alloc_w_base()

tcp_connection_t* tcp_connection_alloc_w_base	(	u8	thread_index,
		tcp_connection_t *	base
	)

Definition at line 309 of file tcp.c.

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◆ tcp_connection_cleanup()

void tcp_connection_cleanup ( tcp_connection_t * tc )

Cleans up connection state.

No notifications.

Definition at line 242 of file tcp.c.

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◆ tcp_connection_close()

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 360 of file tcp.c.

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◆ tcp_connection_del()

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 289 of file tcp.c.

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◆ tcp_connection_free()

void tcp_connection_free ( tcp_connection_t * tc )

Definition at line 322 of file tcp.c.

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◆ tcp_connection_init_vars()

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 703 of file tcp.c.

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◆ tcp_connection_timers_init()

void tcp_connection_timers_init ( tcp_connection_t * tc )

Initialize all connection timers as invalid.

Definition at line 476 of file tcp.c.

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◆ tcp_connection_timers_reset()

void tcp_connection_timers_reset ( tcp_connection_t * tc )

Stop all connection timers.

Definition at line 493 of file tcp.c.

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◆ tcp_connection_tx_pacer_reset()

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

Definition at line 1209 of file tcp.c.

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◆ tcp_connection_tx_pacer_update()

void tcp_connection_tx_pacer_update ( tcp_connection_t * tc )

Definition at line 1196 of file tcp.c.

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◆ tcp_fastrecovery_prr_snd_space()

int tcp_fastrecovery_prr_snd_space ( tcp_connection_t * tc )

Estimate send space using proportional rate reduction (RFC6937)

Definition at line 1657 of file tcp_output.c.

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◆ tcp_get_worker()

static tcp_worker_ctx_t* tcp_get_worker ( u32 thread_index )

inlinestatic

Definition at line 282 of file tcp.h.

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◆ tcp_half_open_connection_cleanup()

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 209 of file tcp.c.

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◆ tcp_init_snd_vars()

void tcp_init_snd_vars ( tcp_connection_t * tc )

Initialize connection send variables.

Definition at line 669 of file tcp.c.

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◆ tcp_lookup_rmt_in_fib()

fib_node_index_t tcp_lookup_rmt_in_fib ( tcp_connection_t * tc )

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◆ tcp_program_ack()

void tcp_program_ack ( tcp_connection_t * tc )

Definition at line 1043 of file tcp_output.c.

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◆ tcp_program_cleanup()

void tcp_program_cleanup	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

Definition at line 335 of file tcp.c.

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◆ tcp_program_dupack()

void tcp_program_dupack ( tcp_connection_t * tc )

Definition at line 1053 of file tcp_output.c.

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◆ tcp_program_retransmit()

void tcp_program_retransmit ( tcp_connection_t * tc )

Definition at line 1065 of file tcp_output.c.

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◆ tcp_punt_unknown()

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

Definition at line 1396 of file tcp.c.

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◆ tcp_reschedule()

void tcp_reschedule ( tcp_connection_t * tc )

Definition at line 1220 of file tcp.c.

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◆ tcp_send_ack()

void tcp_send_ack ( tcp_connection_t * tc )

Definition at line 1023 of file tcp_output.c.

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◆ tcp_send_fin()

void tcp_send_fin ( tcp_connection_t * tc )

Send FIN.

Definition at line 873 of file tcp_output.c.

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◆ tcp_send_reset()

void tcp_send_reset ( tcp_connection_t * tc )

Build and set reset packet for connection.

Definition at line 749 of file tcp_output.c.

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◆ tcp_send_reset_w_pkt()

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 661 of file tcp_output.c.

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◆ tcp_send_syn()

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 808 of file tcp_output.c.

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◆ tcp_send_synack()

void tcp_send_synack ( tcp_connection_t * tc )

Definition at line 844 of file tcp_output.c.

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◆ tcp_send_window_update_ack()

void tcp_send_window_update_ack ( tcp_connection_t * tc )

Send window update ack.

Ensures that it will be sent only once, after a zero rwnd has been advertised in a previous ack, and only if rwnd has grown beyond a configurable value.

Definition at line 1082 of file tcp_output.c.

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◆ tcp_session_custom_tx()

int tcp_session_custom_tx	(	void *	conn,
		transport_send_params_t *	sp
	)

Definition at line 2017 of file tcp_output.c.

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◆ tcp_session_push_header()

u32 tcp_session_push_header	(	transport_connection_t *	tconn,
		vlib_buffer_t *	b
	)

Definition at line 995 of file tcp_output.c.

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◆ tcp_snd_space()

u32 tcp_snd_space ( tcp_connection_t * tc )

Definition at line 951 of file tcp.c.

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◆ tcp_update_burst_snd_vars()

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 300 of file tcp_output.c.

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◆ vnet_get_tcp_main()

static tcp_main_t* vnet_get_tcp_main ( )

inlinestatic

Definition at line 276 of file tcp.h.

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◆ vnet_tcp_enable_disable()

clib_error_t* vnet_tcp_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 1378 of file tcp.c.

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Variable Documentation

◆ format_tcp_connection

format_function_t format_tcp_connection

Definition at line 351 of file tcp.h.

◆ format_tcp_connection_id

format_function_t format_tcp_connection_id

Definition at line 352 of file tcp.h.

◆ format_tcp_flags

format_function_t format_tcp_flags

Definition at line 348 of file tcp.h.

◆ format_tcp_rcv_sacks

format_function_t format_tcp_rcv_sacks

Definition at line 350 of file tcp.h.

◆ format_tcp_sacks

format_function_t format_tcp_sacks

Definition at line 349 of file tcp.h.

◆ format_tcp_state

format_function_t format_tcp_state

Definition at line 347 of file tcp.h.

◆ tcp4_established_node

vlib_node_registration_t tcp4_established_node

(constructor) VLIB_REGISTER_NODE (tcp4_established_node)

Definition at line 1573 of file tcp_input.c.

◆ tcp4_input_node

vlib_node_registration_t tcp4_input_node

(constructor) VLIB_REGISTER_NODE (tcp4_input_node)

Definition at line 3007 of file tcp_input.c.

◆ tcp4_listen_node

vlib_node_registration_t tcp4_listen_node

(constructor) VLIB_REGISTER_NODE (tcp4_listen_node)

Definition at line 2683 of file tcp_input.c.

◆ tcp4_output_node

vlib_node_registration_t tcp4_output_node

(constructor) VLIB_REGISTER_NODE (tcp4_output_node)

Definition at line 2307 of file tcp_output.c.

◆ tcp4_rcv_process_node

vlib_node_registration_t tcp4_rcv_process_node

(constructor) VLIB_REGISTER_NODE (tcp4_rcv_process_node)

Definition at line 2505 of file tcp_input.c.

◆ tcp4_syn_sent_node

vlib_node_registration_t tcp4_syn_sent_node

(constructor) VLIB_REGISTER_NODE (tcp4_syn_sent_node)

Definition at line 2059 of file tcp_input.c.

◆ tcp6_established_node

vlib_node_registration_t tcp6_established_node

(constructor) VLIB_REGISTER_NODE (tcp6_established_node)

Definition at line 1592 of file tcp_input.c.

◆ tcp6_input_node

vlib_node_registration_t tcp6_input_node

(constructor) VLIB_REGISTER_NODE (tcp6_input_node)

Definition at line 3027 of file tcp_input.c.

◆ tcp6_listen_node

vlib_node_registration_t tcp6_listen_node

(constructor) VLIB_REGISTER_NODE (tcp6_listen_node)

Definition at line 2702 of file tcp_input.c.

◆ tcp6_output_node

vlib_node_registration_t tcp6_output_node

(constructor) VLIB_REGISTER_NODE (tcp6_output_node)

Definition at line 2327 of file tcp_output.c.

◆ tcp6_rcv_process_node

vlib_node_registration_t tcp6_rcv_process_node

(constructor) VLIB_REGISTER_NODE (tcp6_rcv_process_node)

Definition at line 2524 of file tcp_input.c.

◆ tcp6_syn_sent_node

vlib_node_registration_t tcp6_syn_sent_node

(constructor) VLIB_REGISTER_NODE (tcp6_syn_sent_node)

Definition at line 2078 of file tcp_input.c.

◆ tcp_main

tcp_main_t tcp_main

Definition at line 28 of file tcp.c.

◆ tcp_timer_persist_handler

timer_expiration_handler tcp_timer_persist_handler

◆ tcp_timer_retransmit_handler

timer_expiration_handler tcp_timer_retransmit_handler

◆ tcp_timer_retransmit_syn_handler

timer_expiration_handler tcp_timer_retransmit_syn_handler

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ foreach_tcp_wrk_stat

◆ tcp_cfg

◆ tcp_error

◆ tcp_node_index

◆ tcp_trajectory_add_start

◆ tcp_validate_txf_size

◆ tcp_worker_stats_inc

Typedef Documentation

◆ tcp_cleanup_req_t

◆ tcp_configuration_t

◆ tcp_error_t

◆ tcp_iss_seed_t

◆ tcp_lookup_dispatch_t

◆ tcp_main_t

◆ tcp_worker_ctx_t

◆ tcp_wrk_stats_t

◆ timer_expiration_handler

Function Documentation

◆ tcp_configure_v4_source_address_range()

◆ tcp_configure_v6_source_address_range()

◆ tcp_connection_alloc()

◆ tcp_connection_alloc_w_base()

◆ tcp_connection_cleanup()

◆ tcp_connection_close()

◆ tcp_connection_del()

◆ tcp_connection_free()

◆ tcp_connection_init_vars()

◆ tcp_connection_timers_init()

◆ tcp_connection_timers_reset()

◆ tcp_connection_tx_pacer_reset()

◆ tcp_connection_tx_pacer_update()

◆ tcp_fastrecovery_prr_snd_space()

◆ tcp_get_worker()

◆ tcp_half_open_connection_cleanup()

◆ tcp_init_snd_vars()

◆ tcp_lookup_rmt_in_fib()

◆ tcp_program_ack()

◆ tcp_program_cleanup()

◆ tcp_program_dupack()

◆ tcp_program_retransmit()

◆ tcp_punt_unknown()

◆ tcp_reschedule()

◆ tcp_send_ack()

◆ tcp_send_fin()

◆ tcp_send_reset()

◆ tcp_send_reset_w_pkt()

◆ tcp_send_syn()

◆ tcp_send_synack()

◆ tcp_send_window_update_ack()

◆ tcp_session_custom_tx()

◆ tcp_session_push_header()

◆ tcp_snd_space()

◆ tcp_update_burst_snd_vars()

◆ vnet_get_tcp_main()

◆ vnet_tcp_enable_disable()

Variable Documentation

◆ format_tcp_connection

◆ format_tcp_connection_id

◆ format_tcp_flags

◆ format_tcp_rcv_sacks

◆ format_tcp_sacks

◆ format_tcp_state

◆ tcp4_established_node

◆ tcp4_input_node

◆ tcp4_listen_node

◆ tcp4_output_node

◆ tcp4_rcv_process_node

◆ tcp4_syn_sent_node

◆ tcp6_established_node

◆ tcp6_input_node

◆ tcp6_listen_node

◆ tcp6_output_node

◆ tcp6_rcv_process_node

◆ tcp6_syn_sent_node