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 u32	tcp_session_push_header (transport_connection_t *tconn, vlib_buffer_t *b)
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 807 of file tcp.c.

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

static

Definition at line 788 of file tcp.c.

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

Definition at line 887 of file tcp.c.

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

static

Definition at line 741 of file tcp.c.

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

static

Definition at line 863 of file tcp.c.

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

static

Definition at line 930 of file tcp.c.

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

static

Definition at line 922 of file tcp.c.

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

Definition at line 962 of file tcp.c.

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

static

Definition at line 986 of file tcp.c.

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

Definition at line 938 of file tcp.c.

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

Definition at line 998 of file tcp.c.

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

static

Definition at line 906 of file tcp.c.

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

Definition at line 723 of file tcp.c.

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

static

Definition at line 766 of file tcp.c.

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

static

Definition at line 826 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 2065 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 634 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 550 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 540 of file tcp.c.

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static void tcp_cc_init ( tcp_connection_t *  tc )

static

Definition at line 533 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 1580 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 1625 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 1717 of file tcp.c.

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tcp_connection_t* tcp_connection_alloc

(

u8

thread_index

)

Definition at line 251 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 333 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 243 of file tcp.c.

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void tcp_connection_free

(

tcp_connection_t *

tc

)

Definition at line 264 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 614 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 277 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 409 of file tcp.c.

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void tcp_connection_timers_reset

(

tcp_connection_t *

tc

)

Stop all connection timers.

Definition at line 426 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 1213 of file tcp.c.

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void tcp_connection_tx_pacer_update

(

tcp_connection_t *

tc

)

Definition at line 1197 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 599 of file tcp.c.

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static void tcp_expired_timers_dispatch ( u32 *  expired_timers )

static

Definition at line 1357 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 560 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 1037 of file tcp.c.

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static clib_error_t* tcp_init ( vlib_main_t *  vm )

static

Definition at line 1511 of file tcp.c.

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void tcp_init_snd_vars

(

tcp_connection_t *

tc

)

Initialize connection send variables.

Definition at line 581 of file tcp.c.

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static void tcp_initialize_iss_seed ( tcp_main_t *  tm )

static

Definition at line 1390 of file tcp.c.

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static void tcp_initialize_timer_wheels ( tcp_main_t *  tm )

static

Definition at line 1376 of file tcp.c.

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static clib_error_t* tcp_main_enable ( vlib_main_t *  vm )

static

Definition at line 1400 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 1501 of file tcp.c.

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static i32 tcp_rcv_wnd_available ( tcp_connection_t *  tc )

static

Definition at line 801 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 1064 of file tcp.c.

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

static

Definition at line 1878 of file tcp.c.

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

Definition at line 1941 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 2022 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 397 of file tcp.c.

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static void tcp_session_close ( u32  conn_index, u32  thread_index  )

static

Definition at line 389 of file tcp.c.

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static void tcp_session_flush_data ( transport_connection_t *  tconn )

static

Definition at line 1162 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 1030 of file tcp.c.

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static int tcp_session_open ( transport_endpoint_cfg_t *  rmt )

static

Definition at line 664 of file tcp.c.

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static u32 tcp_session_push_header ( transport_connection_t *  tconn, vlib_buffer_t *  b  )

static

Definition at line 1155 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 1051 of file tcp.c.

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static u32 tcp_session_send_space ( transport_connection_t *  trans_conn )

static

Definition at line 1124 of file tcp.c.

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static u32 tcp_session_tx_fifo_offset ( transport_connection_t *  trans_conn )

static

Definition at line 1132 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 1903 of file tcp.c.

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u32 tcp_snd_space

(

tcp_connection_t *

tc

)

Definition at line 1118 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 1091 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 1790 of file tcp.c.

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static void tcp_timer_establish_ao_handler ( u32  conn_index )

static

Definition at line 1253 of file tcp.c.

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static void tcp_timer_establish_handler ( u32  conn_index )

static

Definition at line 1236 of file tcp.c.

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static void tcp_timer_keep_handler ( u32  conn_index )

static

Definition at line 1224 of file tcp.c.

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static void tcp_timer_waitclose_handler ( u32  conn_index )

static

Definition at line 1271 of file tcp.c.

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static void tcp_update_time ( f64  now, u8  thread_index  )

static

Definition at line 1143 of file tcp.c.

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uword unformat_tcp_cc_algo	(	unformat_input_t *	input,
		va_list *	va
	)

Definition at line 1542 of file tcp.c.

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uword unformat_tcp_cc_algo_cfg	(	unformat_input_t *	input,
		va_list *	va
	)

Definition at line 1557 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 1483 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 2079 of file tcp.c.

const char* tcp_conn_timers[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_timer

}

Definition at line 759 of file tcp.c.

const char* tcp_connection_flags_str[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_connection_flag

}

Definition at line 734 of file tcp.c.

const char* tcp_dbg_evt_str[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_dbg_evt

}

Definition at line 710 of file tcp.c.

const char* tcp_fsm_states[]

Initial value:

= {
#define _(sym, str) 
  foreach_tcp_fsm_state

}

Definition at line 716 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,
  .bind = tcp_session_bind,
  .unbind = 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,
  .open = 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 1172 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 2056 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 1932 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 1869 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 1343 of file tcp.c.