tcp.c File Reference

TCP host stack utilities. More...

Include dependency graph for tcp.c:

Go to the source code of this file.

Data Structures
struct	tcp_add_del_adj_args_t

Functions
static void	tcp_add_del_adj_cb (tcp_add_del_adj_args_t *args)
static void	tcp_add_del_adjacency (tcp_connection_t *tc, u8 is_add)
static u32	tcp_connection_bind (u32 session_index, transport_endpoint_t *lcl)
static u32	tcp_session_bind (u32 session_index, transport_endpoint_t *tep)
static void	tcp_connection_unbind (u32 listener_index)
static u32	tcp_session_unbind (u32 listener_index)
static transport_connection_t *	tcp_session_get_listener (u32 listener_index)
static void	tcp_half_open_connection_del (tcp_connection_t *tc)
	Cleanup half-open connection. More...
int	tcp_half_open_connection_cleanup (tcp_connection_t *tc)
	Try to cleanup half-open connection. More...
static tcp_connection_t *	tcp_half_open_connection_new (void)
void	tcp_connection_cleanup (tcp_connection_t *tc)
	Cleans up connection state. More...
void	tcp_connection_del (tcp_connection_t *tc)
	Connection removal. 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...
void	tcp_connection_close (tcp_connection_t *tc)
	Begin connection closing procedure. More...
static void	tcp_session_close (u32 conn_index, u32 thread_index)
static void	tcp_session_cleanup (u32 conn_index, u32 thread_index)
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...
static void	tcp_cc_init (tcp_connection_t *tc)
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 u32	tcp_generate_random_iss (tcp_connection_t *tc)
	Generate random iss as per rfc6528. More...
void	tcp_init_snd_vars (tcp_connection_t *tc)
	Initialize connection send variables. More...
void	tcp_enable_pacing (tcp_connection_t *tc)
void	tcp_connection_init_vars (tcp_connection_t *tc)
	Initialize tcp connection variables. More...
static int	tcp_alloc_custom_local_endpoint (tcp_main_t *tm, ip46_address_t *lcl_addr, u16 *lcl_port, u8 is_ip4)
static int	tcp_session_open (transport_endpoint_cfg_t *rmt)
u8 *	format_tcp_state (u8 *s, va_list *args)
static u8 *	format_tcp_connection_flags (u8 *s, va_list *args)
static u8 *	format_tcp_timers (u8 *s, va_list *args)
static u8 *	format_tcp_congestion_status (u8 *s, va_list *args)
static i32	tcp_rcv_wnd_available (tcp_connection_t *tc)
static u8 *	format_tcp_congestion (u8 *s, va_list *args)
static u8 *	format_tcp_vars (u8 *s, va_list *args)
static u8 *	format_tcp_connection_id (u8 *s, va_list *args)
u8 *	format_tcp_connection (u8 *s, va_list *args)
static u8 *	format_tcp_session (u8 *s, va_list *args)
static u8 *	format_tcp_listener_session (u8 *s, va_list *args)
static u8 *	format_tcp_half_open_session (u8 *s, va_list *args)
u8 *	format_tcp_sacks (u8 *s, va_list *args)
u8 *	format_tcp_rcv_sacks (u8 *s, va_list *args)
static u8 *	format_tcp_sack_hole (u8 *s, va_list *args)
u8 *	format_tcp_scoreboard (u8 *s, va_list *args)
static transport_connection_t *	tcp_session_get_transport (u32 conn_index, u32 thread_index)
static transport_connection_t *	tcp_half_open_session_get_transport (u32 conn_index)
static u16	tcp_session_send_mss (transport_connection_t *trans_conn)
	Compute maximum segment size for session layer. More...
static u32	tcp_round_snd_space (tcp_connection_t *tc, u32 snd_space)
static u32	tcp_snd_space_inline (tcp_connection_t *tc)
	Compute tx window session is allowed to fill. More...
u32	tcp_snd_space (tcp_connection_t *tc)
static u32	tcp_session_send_space (transport_connection_t *trans_conn)
static u32	tcp_session_tx_fifo_offset (transport_connection_t *trans_conn)
static void	tcp_update_time (f64 now, u8 thread_index)
static void	tcp_session_flush_data (transport_connection_t *tconn)
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_timer_keep_handler (u32 conn_index)
static void	tcp_timer_establish_handler (u32 conn_index)
static void	tcp_timer_establish_ao_handler (u32 conn_index)
static void	tcp_timer_waitclose_handler (u32 conn_index)
static void	tcp_expired_timers_dispatch (u32 *expired_timers)
static void	tcp_initialize_timer_wheels (tcp_main_t *tm)
static void	tcp_initialize_iss_seed (tcp_main_t *tm)
static clib_error_t *	tcp_main_enable (vlib_main_t *vm)
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 clib_error_t *	tcp_init (vlib_main_t *vm)
uword	unformat_tcp_cc_algo (unformat_input_t *input, va_list *va)
uword	unformat_tcp_cc_algo_cfg (unformat_input_t *input, va_list *va)
static clib_error_t *	tcp_config_fn (vlib_main_t *vm, unformat_input_t *input)
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...
static clib_error_t *	tcp_src_address (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
static u8 *	tcp_scoreboard_dump_trace (u8 *s, sack_scoreboard_t *sb)
static clib_error_t *	tcp_show_scoreboard_trace_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
u8 *	tcp_scoreboard_replay (u8 *s, tcp_connection_t *tc, u8 verbose)
static clib_error_t *	tcp_scoreboard_trace_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
static clib_error_t *	show_tcp_punt_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)

Variables
tcp_main_t	tcp_main
const char *	tcp_dbg_evt_str []
const char *	tcp_fsm_states []
const char *	tcp_connection_flags_str []
const char *	tcp_conn_timers []
static const transport_proto_vft_t	tcp_proto
static timer_expiration_handler *	timer_expiration_handlers [TCP_N_TIMERS]
static vlib_cli_command_t	tcp_src_address_command
	(constructor) VLIB_CLI_COMMAND (tcp_src_address_command) More...
static vlib_cli_command_t	tcp_show_scoreboard_trace_command
	(constructor) VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command) More...
static vlib_cli_command_t	tcp_replay_scoreboard_command
	(constructor) VLIB_CLI_COMMAND (tcp_replay_scoreboard_command) More...
static vlib_cli_command_t	show_tcp_punt_command
	(constructor) VLIB_CLI_COMMAND (show_tcp_punt_command) More...

Detailed Description

TCP host stack utilities.

Definition in file tcp.c.

Function Documentation

static u8* format_tcp_congestion ( u8 *  s, va_list *  args  )

static

Definition at line 824 of file tcp.c.

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static u8* format_tcp_congestion_status ( u8 *  s, va_list *  args  )

static

Definition at line 805 of file tcp.c.

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

Definition at line 906 of file tcp.c.

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static u8* format_tcp_connection_flags ( u8 *  s, va_list *  args  )

static

Definition at line 758 of file tcp.c.

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static u8* format_tcp_connection_id ( u8 *  s, va_list *  args  )

static

Definition at line 882 of file tcp.c.

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static u8* format_tcp_half_open_session ( u8 *  s, va_list *  args  )

static

Definition at line 953 of file tcp.c.

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static u8* format_tcp_listener_session ( u8 *  s, va_list *  args  )

static

Definition at line 941 of file tcp.c.

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

Definition at line 985 of file tcp.c.

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static u8* format_tcp_sack_hole ( u8 *  s, va_list *  args  )

static

Definition at line 1009 of file tcp.c.

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

Definition at line 961 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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static u8* format_tcp_session ( u8 *  s, va_list *  args  )

static

Definition at line 925 of file tcp.c.

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

Definition at line 740 of file tcp.c.

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static u8* format_tcp_timers ( u8 *  s, va_list *  args  )

static

Definition at line 783 of file tcp.c.

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static u8* format_tcp_vars ( u8 *  s, va_list *  args  )

static

Definition at line 842 of file tcp.c.

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static clib_error_t* show_tcp_punt_fn ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd_arg  )

static

Definition at line 2089 of file tcp.c.

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static void tcp_add_del_adj_cb ( tcp_add_del_adj_args_t *  args )

static

Definition at line 41 of file tcp.c.

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static void tcp_add_del_adjacency ( tcp_connection_t *  tc, u8  is_add  )

static

Definition at line 59 of file tcp.c.

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static int tcp_alloc_custom_local_endpoint ( tcp_main_t *  tm, ip46_address_t *  lcl_addr, u16 *  lcl_port, u8  is_ip4  )

static

Definition at line 651 of file tcp.c.

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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_init ( tcp_connection_t *  tc )

static

Definition at line 549 of file tcp.c.

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static clib_error_t* tcp_config_fn ( vlib_main_t *  vm, unformat_input_t *  input  )

static

Definition at line 1602 of file tcp.c.

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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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tcp_connection_t* tcp_connection_alloc

(

u8

thread_index

)

Definition at line 253 of file tcp.c.

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static u32 tcp_connection_bind ( u32  session_index, transport_endpoint_t *  lcl  )

static

Definition at line 73 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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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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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_connection_unbind ( u32  listener_index )

static

Definition at line 113 of file tcp.c.

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void tcp_enable_pacing

(

tcp_connection_t *

tc

)

Definition at line 616 of file tcp.c.

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static void tcp_expired_timers_dispatch ( u32 *  expired_timers )

static

Definition at line 1372 of file tcp.c.

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static u32 tcp_generate_random_iss ( tcp_connection_t *  tc )

static

Generate random iss as per rfc6528.

Definition at line 577 of file tcp.c.

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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 void tcp_half_open_connection_del ( tcp_connection_t *  tc )

static

Cleanup half-open connection.

Definition at line 150 of file tcp.c.

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static tcp_connection_t* tcp_half_open_connection_new ( void  )

static

Definition at line 182 of file tcp.c.

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static transport_connection_t* tcp_half_open_session_get_transport ( u32  conn_index )

static

Definition at line 1060 of file tcp.c.

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static clib_error_t* tcp_init ( vlib_main_t *  vm )

static

Definition at line 1526 of file tcp.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 void tcp_initialize_iss_seed ( tcp_main_t *  tm )

static

Definition at line 1405 of file tcp.c.

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static void tcp_initialize_timer_wheels ( tcp_main_t *  tm )

static

Definition at line 1391 of file tcp.c.

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static clib_error_t* tcp_main_enable ( vlib_main_t *  vm )

static

Definition at line 1415 of file tcp.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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static i32 tcp_rcv_wnd_available ( tcp_connection_t *  tc )

static

Definition at line 818 of file tcp.c.

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static u32 tcp_round_snd_space ( tcp_connection_t *  tc, u32  snd_space  )

inlinestatic

Definition at line 1087 of file tcp.c.

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static u8* tcp_scoreboard_dump_trace ( u8 *  s, sack_scoreboard_t *  sb  )

static

Definition at line 1902 of file tcp.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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static clib_error_t* tcp_scoreboard_trace_fn ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd_arg  )

static

Definition at line 2046 of file tcp.c.

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static u32 tcp_session_bind ( u32  session_index, transport_endpoint_t *  tep  )

static

Definition at line 107 of file tcp.c.

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static void tcp_session_cleanup ( u32  conn_index, u32  thread_index  )

static

Definition at line 413 of file tcp.c.

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static void tcp_session_close ( u32  conn_index, u32  thread_index  )

static

Definition at line 405 of file tcp.c.

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static void tcp_session_flush_data ( transport_connection_t *  tconn )

static

Definition at line 1178 of file tcp.c.

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static transport_connection_t* tcp_session_get_listener ( u32  listener_index )

static

Definition at line 137 of file tcp.c.

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static transport_connection_t* tcp_session_get_transport ( u32  conn_index, u32  thread_index  )

static

Definition at line 1053 of file tcp.c.

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static int tcp_session_open ( transport_endpoint_cfg_t *  rmt )

static

Definition at line 681 of file tcp.c.

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static u16 tcp_session_send_mss ( transport_connection_t *  trans_conn )

static

Compute maximum segment size for session layer.

Since the result needs to be the actual data length, it first computes the tcp options to be used in the next burst and subtracts their length from the connection's snd_mss.

Definition at line 1074 of file tcp.c.

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static u32 tcp_session_send_space ( transport_connection_t *  trans_conn )

static

Definition at line 1147 of file tcp.c.

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static u32 tcp_session_tx_fifo_offset ( transport_connection_t *  trans_conn )

static

Definition at line 1155 of file tcp.c.

static u32 tcp_session_unbind ( u32  listener_index )

static

Definition at line 130 of file tcp.c.

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static clib_error_t* tcp_show_scoreboard_trace_fn ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd_arg  )

static

Definition at line 1927 of file tcp.c.

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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_snd_space_inline ( tcp_connection_t *  tc )

inlinestatic

Compute tx window session is allowed to fill.

Takes into account available send space, snd_mss and the congestion state of the connection. If possible, the value returned is a multiple of snd_mss.

Parameters

tc	tcp connection

Returns

number of bytes session is allowed to write

Definition at line 1114 of file tcp.c.

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static clib_error_t* tcp_src_address ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd_arg  )

static

Definition at line 1814 of file tcp.c.

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static void tcp_timer_establish_ao_handler ( u32  conn_index )

static

Definition at line 1271 of file tcp.c.

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static void tcp_timer_establish_handler ( u32  conn_index )

static

Definition at line 1252 of file tcp.c.

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static void tcp_timer_keep_handler ( u32  conn_index )

static

Definition at line 1240 of file tcp.c.

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static void tcp_timer_waitclose_handler ( u32  conn_index )

static

Definition at line 1289 of file tcp.c.

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static void tcp_update_time ( f64  now, u8  thread_index  )

static

Definition at line 1166 of file tcp.c.

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uword unformat_tcp_cc_algo	(	unformat_input_t *	input,
		va_list *	va
	)

Definition at line 1559 of file tcp.c.

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uword unformat_tcp_cc_algo_cfg	(	unformat_input_t *	input,
		va_list *	va
	)

Definition at line 1579 of file tcp.c.

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clib_error_t* vnet_tcp_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 1498 of file tcp.c.

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Variable Documentation

vlib_cli_command_t show_tcp_punt_command

static

Initial value:

=
{
  .path = "show tcp punt",
  .short_help = "show tcp punt",
  .function = show_tcp_punt_fn,
}

(constructor) VLIB_CLI_COMMAND (show_tcp_punt_command)

Definition at line 2103 of file tcp.c.

const char* tcp_conn_timers[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_timer

}

Definition at line 776 of file tcp.c.

const char* tcp_connection_flags_str[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_connection_flag

}

Definition at line 751 of file tcp.c.

const char* tcp_dbg_evt_str[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_dbg_evt

}

Definition at line 727 of file tcp.c.

const char* tcp_fsm_states[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_fsm_state

}

Definition at line 733 of file tcp.c.

tcp_main_t tcp_main

Definition at line 29 of file tcp.c.

const transport_proto_vft_t tcp_proto

static

Initial value:

= {
  .enable = vnet_tcp_enable_disable,
  .start_listen = tcp_session_bind,
  .stop_listen = tcp_session_unbind,
  .push_header = tcp_session_push_header,
  .get_connection = tcp_session_get_transport,
  .get_listener = tcp_session_get_listener,
  .get_half_open = tcp_half_open_session_get_transport,
  .connect = tcp_session_open,
  .close = tcp_session_close,
  .cleanup = tcp_session_cleanup,
  .send_mss = tcp_session_send_mss,
  .send_space = tcp_session_send_space,
  .update_time = tcp_update_time,
  .tx_fifo_offset = tcp_session_tx_fifo_offset,
  .flush_data = tcp_session_flush_data,
  .format_connection = format_tcp_session,
  .format_listener = format_tcp_listener_session,
  .format_half_open = format_tcp_half_open_session,
  .tx_type = TRANSPORT_TX_PEEK,
  .service_type = TRANSPORT_SERVICE_VC,
}

Definition at line 1188 of file tcp.c.

vlib_cli_command_t tcp_replay_scoreboard_command

static

Initial value:

=
{
  .path = "tcp replay scoreboard",
  .short_help = "tcp replay scoreboard <connection>",
  .function = tcp_scoreboard_trace_fn,
}

(constructor) VLIB_CLI_COMMAND (tcp_replay_scoreboard_command)

Definition at line 2080 of file tcp.c.

vlib_cli_command_t tcp_show_scoreboard_trace_command

static

Initial value:

=
{
  .path = "show tcp scoreboard trace",
  .short_help = "show tcp scoreboard trace <connection>",
  .function = tcp_show_scoreboard_trace_fn,
}

(constructor) VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command)

Definition at line 1956 of file tcp.c.

vlib_cli_command_t tcp_src_address_command

static

Initial value:

=
{
  .path = "tcp src-address",
  .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range",
  .function = tcp_src_address,
}

(constructor) VLIB_CLI_COMMAND (tcp_src_address_command)

Definition at line 1893 of file tcp.c.

timer_expiration_handler* timer_expiration_handlers[TCP_N_TIMERS]

static

Initial value:

=
{
    tcp_timer_retransmit_handler,
    tcp_timer_delack_handler,
    tcp_timer_persist_handler,
    tcp_timer_keep_handler,
    tcp_timer_waitclose_handler,
    tcp_timer_retransmit_syn_handler,
    tcp_timer_establish_handler,
    tcp_timer_establish_ao_handler,
}

Definition at line 1358 of file tcp.c.