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Vector Packet Processing
tcp.c File Reference

TCP host stack utilities. More...

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Go to the source code of this file.

Functions

static u32 tcp_connection_bind (u32 session_index, transport_endpoint_t *lcl)
 
u32 tcp_session_bind (u32 session_index, transport_endpoint_t *tep)
 
static void tcp_connection_unbind (u32 listener_index)
 
u32 tcp_session_unbind (u32 listener_index)
 
transport_connection_ttcp_session_get_listener (u32 listener_index)
 
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...
 
tcp_connection_ttcp_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_ttcp_connection_new (u8 thread_index)
 
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...
 
void tcp_session_close (u32 conn_index, u32 thread_index)
 
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...
 
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...
 
static int tcp_alloc_custom_local_endpoint (tcp_main_t *tm, ip46_address_t *lcl_addr, u16 *lcl_port, u8 is_ip4)
 
int tcp_connection_open (transport_endpoint_t *rmt)
 
int tcp_session_open (transport_endpoint_t *tep)
 
u8format_tcp_state (u8 *s, va_list *args)
 
u8format_tcp_connection_flags (u8 *s, va_list *args)
 
u8format_tcp_timers (u8 *s, va_list *args)
 
u8format_tcp_congestion_status (u8 *s, va_list *args)
 
u8format_tcp_vars (u8 *s, va_list *args)
 
u8format_tcp_connection_id (u8 *s, va_list *args)
 
u8format_tcp_connection (u8 *s, va_list *args)
 
u8format_tcp_session (u8 *s, va_list *args)
 
u8format_tcp_listener_session (u8 *s, va_list *args)
 
u8format_tcp_half_open_session (u8 *s, va_list *args)
 
u8format_tcp_sacks (u8 *s, va_list *args)
 
u8format_tcp_rcv_sacks (u8 *s, va_list *args)
 
u8format_tcp_sack_hole (u8 *s, va_list *args)
 
u8format_tcp_scoreboard (u8 *s, va_list *args)
 
transport_connection_ttcp_session_get_transport (u32 conn_index, u32 thread_index)
 
transport_connection_ttcp_half_open_session_get_transport (u32 conn_index)
 
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)
 
u32 tcp_snd_space (tcp_connection_t *tc)
 Compute tx window session is allowed to fill. More...
 
u32 tcp_session_send_space (transport_connection_t *trans_conn)
 
i32 tcp_rcv_wnd_available (tcp_connection_t *tc)
 
u32 tcp_session_tx_fifo_offset (transport_connection_t *trans_conn)
 
void tcp_update_time (f64 now, u8 thread_index)
 
void tcp_timer_keep_handler (u32 conn_index)
 
void tcp_timer_establish_handler (u32 conn_index)
 
void tcp_timer_waitclose_handler (u32 conn_index)
 
static void tcp_expired_timers_dispatch (u32 *expired_timers)
 
void tcp_initialize_timer_wheels (tcp_main_t *tm)
 
clib_error_ttcp_main_enable (vlib_main_t *vm)
 
clib_error_tvnet_tcp_enable_disable (vlib_main_t *vm, u8 is_en)
 
void tcp_punt_unknown (vlib_main_t *vm, u8 is_ip4, u8 is_add)
 
clib_error_ttcp_init (vlib_main_t *vm)
 
static clib_error_ttcp_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_ttcp_src_address (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
 
static u8tcp_scoreboard_dump_trace (u8 *s, sack_scoreboard_t *sb)
 
static clib_error_ttcp_show_scoreboard_trace_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
 
u8tcp_scoreboard_replay (u8 *s, tcp_connection_t *tc, u8 verbose)
 
static clib_error_ttcp_scoreboard_trace_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
 
static clib_error_tshow_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_handlertimer_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

u8* format_tcp_congestion_status ( u8 s,
va_list *  args 
)

Definition at line 664 of file tcp.c.

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u8* format_tcp_connection ( u8 s,
va_list *  args 
)

Definition at line 741 of file tcp.c.

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u8* format_tcp_connection_flags ( u8 s,
va_list *  args 
)

Definition at line 614 of file tcp.c.

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u8* format_tcp_connection_id ( u8 s,
va_list *  args 
)

Definition at line 717 of file tcp.c.

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u8* format_tcp_half_open_session ( u8 s,
va_list *  args 
)

Definition at line 784 of file tcp.c.

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u8* format_tcp_listener_session ( u8 s,
va_list *  args 
)

Definition at line 776 of file tcp.c.

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u8* format_tcp_rcv_sacks ( u8 s,
va_list *  args 
)

Definition at line 816 of file tcp.c.

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u8* format_tcp_sack_hole ( u8 s,
va_list *  args 
)

Definition at line 840 of file tcp.c.

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u8* format_tcp_sacks ( u8 s,
va_list *  args 
)

Definition at line 792 of file tcp.c.

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u8* format_tcp_scoreboard ( u8 s,
va_list *  args 
)

Definition at line 852 of file tcp.c.

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u8* format_tcp_session ( u8 s,
va_list *  args 
)

Definition at line 760 of file tcp.c.

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u8* format_tcp_state ( u8 s,
va_list *  args 
)

Definition at line 596 of file tcp.c.

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u8* format_tcp_timers ( u8 s,
va_list *  args 
)

Definition at line 639 of file tcp.c.

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u8* format_tcp_vars ( u8 s,
va_list *  args 
)

Definition at line 677 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 1783 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 501 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 1310 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
vmvlib_main_t pointer
startfirst ipv4 address in the source address range
endlast ipv4 address in the source address range
table_idVRF / table ID, 0 for the default FIB
Returns
0 if all OK, else an error indication from api_errno.h

Definition at line 1346 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
vmvlib_main_t pointer
startfirst ipv6 address in the source address range
endlast ipv6 address in the source address range
table_idVRF / table ID, 0 for the default FIB
Returns
0 if all OK, else an error indication from api_errno.h

Definition at line 1438 of file tcp.c.

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static u32 tcp_connection_bind ( u32  session_index,
transport_endpoint_t lcl 
)
static

Definition at line 32 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 158 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 270 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 196 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 488 of file tcp.c.

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tcp_connection_t* tcp_connection_new ( u8  thread_index)

Definition at line 204 of file tcp.c.

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int tcp_connection_open ( transport_endpoint_t rmt)

Definition at line 531 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 221 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 337 of file tcp.c.

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void tcp_connection_timers_reset ( tcp_connection_t tc)

Stop all connection timers.

Definition at line 354 of file tcp.c.

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static void tcp_connection_unbind ( u32  listener_index)
static

Definition at line 72 of file tcp.c.

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static void tcp_expired_timers_dispatch ( u32 expired_timers)
static

Definition at line 1130 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 129 of file tcp.c.

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void tcp_half_open_connection_del ( tcp_connection_t tc)

Cleanup half-open connection.

Definition at line 109 of file tcp.c.

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tcp_connection_t* tcp_half_open_connection_new ( void  )

Definition at line 141 of file tcp.c.

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transport_connection_t* tcp_half_open_session_get_transport ( u32  conn_index)

Definition at line 885 of file tcp.c.

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clib_error_t* tcp_init ( vlib_main_t vm)

Definition at line 1281 of file tcp.c.

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void tcp_init_snd_vars ( tcp_connection_t tc)

Initialize connection send variables.

Definition at line 464 of file tcp.c.

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void tcp_initialize_timer_wheels ( tcp_main_t tm)

Definition at line 1149 of file tcp.c.

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clib_error_t* tcp_main_enable ( vlib_main_t vm)

Definition at line 1163 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 1271 of file tcp.c.

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i32 tcp_rcv_wnd_available ( tcp_connection_t tc)

Definition at line 996 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 912 of file tcp.c.

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

Definition at line 1599 of file tcp.c.

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

Definition at line 1662 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 1740 of file tcp.c.

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u32 tcp_session_bind ( u32  session_index,
transport_endpoint_t tep 
)

Definition at line 66 of file tcp.c.

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void tcp_session_cleanup ( u32  conn_index,
u32  thread_index 
)

Definition at line 321 of file tcp.c.

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void tcp_session_close ( u32  conn_index,
u32  thread_index 
)

Definition at line 313 of file tcp.c.

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transport_connection_t* tcp_session_get_listener ( u32  listener_index)

Definition at line 96 of file tcp.c.

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transport_connection_t* tcp_session_get_transport ( u32  conn_index,
u32  thread_index 
)

Definition at line 878 of file tcp.c.

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int tcp_session_open ( transport_endpoint_t tep)

Definition at line 578 of file tcp.c.

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u16 tcp_session_send_mss ( transport_connection_t trans_conn)

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 899 of file tcp.c.

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u32 tcp_session_send_space ( transport_connection_t trans_conn)

Definition at line 988 of file tcp.c.

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u32 tcp_session_tx_fifo_offset ( transport_connection_t trans_conn)

Definition at line 1002 of file tcp.c.

u32 tcp_session_unbind ( u32  listener_index)

Definition at line 89 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 1624 of file tcp.c.

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u32 tcp_snd_space ( tcp_connection_t tc)

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
tctcp connection
Returns
number of bytes session is allowed to write

Definition at line 939 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 1511 of file tcp.c.

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void tcp_timer_establish_handler ( u32  conn_index)

Definition at line 1056 of file tcp.c.

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void tcp_timer_keep_handler ( u32  conn_index)

Definition at line 1044 of file tcp.c.

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void tcp_timer_waitclose_handler ( u32  conn_index)

Definition at line 1084 of file tcp.c.

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void tcp_update_time ( f64  now,
u8  thread_index 
)

Definition at line 1013 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 1253 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,
}
static clib_error_t * show_tcp_punt_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1783

(constructor) VLIB_CLI_COMMAND (show_tcp_punt_command)

Definition at line 1797 of file tcp.c.

const char* tcp_conn_timers[]
Initial value:
= {
#define _(sym, str)
}
#define foreach_tcp_timer
TCP timers.
Definition: tcp.h:69

Definition at line 632 of file tcp.c.

const char* tcp_connection_flags_str[]
Initial value:
= {
#define _(sym, str)
}
#define foreach_tcp_connection_flag
TCP connection flags.
Definition: tcp.h:114

Definition at line 607 of file tcp.c.

const char* tcp_dbg_evt_str[]
Initial value:
= {
#define _(sym, str)
}

Definition at line 583 of file tcp.c.

const char* tcp_fsm_states[]
Initial value:
= {
#define _(sym, str)
}
#define foreach_tcp_fsm_state
TCP FSM state definitions as per RFC793.
Definition: tcp.h:42

Definition at line 589 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:
= {
.unbind = tcp_session_unbind,
.push_header = tcp_push_header,
.get_connection = tcp_session_get_transport,
.get_listener = tcp_session_get_listener,
.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,
.format_connection = format_tcp_session,
.format_listener = format_tcp_listener_session,
.format_half_open = format_tcp_half_open_session,
}
u32 tcp_session_unbind(u32 listener_index)
Definition: tcp.c:89
u32 tcp_session_bind(u32 session_index, transport_endpoint_t *tep)
Definition: tcp.c:66
transport_connection_t * tcp_half_open_session_get_transport(u32 conn_index)
Definition: tcp.c:885
u32 tcp_session_tx_fifo_offset(transport_connection_t *trans_conn)
Definition: tcp.c:1002
transport_connection_t * tcp_session_get_listener(u32 listener_index)
Definition: tcp.c:96
void tcp_session_cleanup(u32 conn_index, u32 thread_index)
Definition: tcp.c:321
clib_error_t * vnet_tcp_enable_disable(vlib_main_t *vm, u8 is_en)
Definition: tcp.c:1253
u32 tcp_push_header(transport_connection_t *tconn, vlib_buffer_t *b)
Definition: tcp_output.c:1963
void tcp_session_close(u32 conn_index, u32 thread_index)
Definition: tcp.c:313
u8 * format_tcp_half_open_session(u8 *s, va_list *args)
Definition: tcp.c:784
u8 * format_tcp_session(u8 *s, va_list *args)
Definition: tcp.c:760
void tcp_update_time(f64 now, u8 thread_index)
Definition: tcp.c:1013
u16 tcp_session_send_mss(transport_connection_t *trans_conn)
Compute maximum segment size for session layer.
Definition: tcp.c:899
int tcp_session_open(transport_endpoint_t *tep)
Definition: tcp.c:578
u32 tcp_session_send_space(transport_connection_t *trans_conn)
Definition: tcp.c:988
transport_connection_t * tcp_session_get_transport(u32 conn_index, u32 thread_index)
Definition: tcp.c:878
u8 * format_tcp_listener_session(u8 *s, va_list *args)
Definition: tcp.c:776

Definition at line 1022 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>",
}
static clib_error_t * tcp_scoreboard_trace_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1740

(constructor) VLIB_CLI_COMMAND (tcp_replay_scoreboard_command)

Definition at line 1774 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>",
}
static clib_error_t * tcp_show_scoreboard_trace_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1624

(constructor) VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command)

Definition at line 1653 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,
}
static clib_error_t * tcp_src_address(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1511

(constructor) VLIB_CLI_COMMAND (tcp_src_address_command)

Definition at line 1590 of file tcp.c.

timer_expiration_handler* timer_expiration_handlers[TCP_N_TIMERS]
static
Initial value:
=
{
}
void tcp_timer_keep_handler(u32 conn_index)
Definition: tcp.c:1044
timer_expiration_handler tcp_timer_retransmit_handler
void tcp_timer_establish_handler(u32 conn_index)
Definition: tcp.c:1056
timer_expiration_handler tcp_timer_retransmit_syn_handler
timer_expiration_handler tcp_timer_persist_handler
void tcp_timer_waitclose_handler(u32 conn_index)
Definition: tcp.c:1084
timer_expiration_handler tcp_timer_delack_handler

Definition at line 1117 of file tcp.c.