session.c File Reference

Session and session manager. More...

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Functions
int	stream_session_create_i (segment_manager_t *sm, transport_connection_t *tc, u8 alloc_fifos, stream_session_t **ret_s)
static void	session_enqueue_discard_chain_bytes (vlib_main_t *vm, vlib_buffer_t *b, vlib_buffer_t **chain_b, u32 n_bytes_to_drop)
	Discards bytes from buffer chain. More...
static int	session_enqueue_chain_tail (stream_session_t *s, vlib_buffer_t *b, u32 offset, u8 is_in_order)
	Enqueue buffer chain tail. More...
int	stream_session_enqueue_data (transport_connection_t *tc, vlib_buffer_t *b, u32 offset, u8 queue_event, u8 is_in_order)
u8	stream_session_no_space (transport_connection_t *tc, u32 thread_index, u16 data_len)
	Check if we have space in rx fifo to push more bytes. More...
u32	stream_session_tx_fifo_max_dequeue (transport_connection_t *tc)
int	stream_session_peek_bytes (transport_connection_t *tc, u8 *buffer, u32 offset, u32 max_bytes)
u32	stream_session_dequeue_drop (transport_connection_t *tc, u32 max_bytes)
static int	stream_session_enqueue_notify (stream_session_t *s, u8 block)
	Notify session peer that new data has been enqueued. More...
int	session_manager_flush_enqueue_events (u32 thread_index)
	Flushes queue of sessions that are to be notified of new data enqueued events. More...
void	stream_session_init_fifos_pointers (transport_connection_t *tc, u32 rx_pointer, u32 tx_pointer)
	Init fifo tail and head pointers. More...
int	stream_session_connect_notify (transport_connection_t *tc, u8 is_fail)
void	stream_session_accept_notify (transport_connection_t *tc)
void	stream_session_disconnect_notify (transport_connection_t *tc)
	Notification from transport that connection is being closed. More...
void	stream_session_delete (stream_session_t *s)
	Cleans up session and lookup table. More...
void	stream_session_delete_notify (transport_connection_t *tc)
	Notification from transport that connection is being deleted. More...
void	stream_session_reset_notify (transport_connection_t *tc)
	Notify application that connection has been reset. More...
int	stream_session_accept (transport_connection_t *tc, u32 listener_index, u8 sst, u8 notify)
	Accept a stream session. More...
int	stream_session_open (u32 app_index, session_type_t st, transport_endpoint_t *rmt, transport_connection_t **res)
	Ask transport to open connection to remote transport endpoint. More...
int	stream_session_listen (stream_session_t *s, transport_endpoint_t *tep)
	Ask transport to listen on local transport endpoint. More...
int	stream_session_stop_listen (stream_session_t *s)
	Ask transport to stop listening on local transport endpoint. More...
void	session_send_session_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index)
void	stream_session_disconnect (stream_session_t *s)
	Disconnect session and propagate to transport. More...
void	stream_session_cleanup (stream_session_t *s)
	Cleanup transport and session state. More...
void	session_vpp_event_queue_allocate (session_manager_main_t *smm, u32 thread_index)
	Allocate vpp event queue (once) per worker thread. More...
session_type_t	session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
static clib_error_t *	session_manager_main_enable (vlib_main_t *vm)
void	session_node_enable_disable (u8 is_en)
clib_error_t *	vnet_session_enable_disable (vlib_main_t *vm, u8 is_en)
clib_error_t *	session_manager_main_init (vlib_main_t *vm)
static clib_error_t *	session_config_fn (vlib_main_t *vm, unformat_input_t *input)

Variables
session_manager_main_t	session_manager_main
transport_proto_vft_t *	tp_vfts
	Per-type vector of transport protocol virtual function tables. More...

Detailed Description

Session and session manager.

Definition in file session.c.

Function Documentation

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

static

Definition at line 959 of file session.c.

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static int session_enqueue_chain_tail ( stream_session_t *  s, vlib_buffer_t *  b, u32  offset, u8  is_in_order  )

inlinestatic

Enqueue buffer chain tail.

Definition at line 132 of file session.c.

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static void session_enqueue_discard_chain_bytes ( vlib_main_t *  vm, vlib_buffer_t *  b, vlib_buffer_t **  chain_b, u32  n_bytes_to_drop  )

inlinestatic

Discards bytes from buffer chain.

It discards n_bytes_to_drop starting at first buffer after chain_b

Definition at line 101 of file session.c.

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int session_manager_flush_enqueue_events

(

u32

thread_index

)

Flushes queue of sessions that are to be notified of new data enqueued events.

Parameters

thread_index

Thread index for which the flush is to be performed.

Returns

0 on success or a positive number indicating the number of failures due to API queue being full.

Definition at line 392 of file session.c.

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static clib_error_t* session_manager_main_enable ( vlib_main_t *  vm )

static

Definition at line 841 of file session.c.

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clib_error_t* session_manager_main_init

(

vlib_main_t *

vm

)

Definition at line 949 of file session.c.

void session_node_enable_disable

(

u8

is_en

)

Definition at line 916 of file session.c.

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void session_send_session_evt_to_thread	(	u64	session_handle,
		fifo_event_type_t	evt_type,
		u32	thread_index
	)

Definition at line 730 of file session.c.

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session_type_t session_type_from_proto_and_ip	(	transport_proto_t	proto,
		u8	is_ip4
	)

Definition at line 820 of file session.c.

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void session_vpp_event_queue_allocate	(	session_manager_main_t *	smm,
		u32	thread_index
	)

Allocate vpp event queue (once) per worker thread.

Definition at line 794 of file session.c.

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int stream_session_accept	(	transport_connection_t *	tc,
		u32	listener_index,
		u8	sst,
		u8	notify
	)

Accept a stream session.

Optionally ping the server by callback.

Definition at line 594 of file session.c.

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void stream_session_accept_notify

(

transport_connection_t *

tc

)

Definition at line 506 of file session.c.

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void stream_session_cleanup

(

stream_session_t *

s

)

Cleanup transport and session state.

Notify transport of the cleanup, wait for a delete notify to actually remove the session state.

Definition at line 776 of file session.c.

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int stream_session_connect_notify	(	transport_connection_t *	tc,
		u8	is_fail
	)

Definition at line 441 of file session.c.

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int stream_session_create_i	(	segment_manager_t *	sm,
		transport_connection_t *	tc,
		u8	alloc_fifos,
		stream_session_t **	ret_s
	)

Definition at line 32 of file session.c.

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void stream_session_delete

(

stream_session_t *

s

)

Cleans up session and lookup table.

Definition at line 538 of file session.c.

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void stream_session_delete_notify

(

transport_connection_t *

tc

)

Notification from transport that connection is being deleted.

This removes the session if it is still valid. It should be called only on previously fully established sessions. For instance failed connects should call stream_session_connect_notify and indicate that the connect has failed.

Definition at line 565 of file session.c.

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u32 stream_session_dequeue_drop	(	transport_connection_t *	tc,
		u32	max_bytes
	)

Definition at line 307 of file session.c.

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void stream_session_disconnect

(

stream_session_t *

s

)

Disconnect session and propagate to transport.

This should eventually result in a delete notification that allows us to cleanup session state. Called for both active/passive disconnects.

Should be called from the session's thread.

Definition at line 763 of file session.c.

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void stream_session_disconnect_notify

(

transport_connection_t *

tc

)

Notification from transport that connection is being closed.

A disconnect is sent to application but state is not removed. Once disconnect is acknowledged by application, session disconnect is called. Ultimately this leads to close being called on transport (passive close).

Definition at line 524 of file session.c.

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int stream_session_enqueue_data	(	transport_connection_t *	tc,
		vlib_buffer_t *	b,
		u32	offset,
		u8	queue_event,
		u8	is_in_order
	)

Definition at line 220 of file session.c.

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static int stream_session_enqueue_notify ( stream_session_t *  s, u8  block  )

static

Notify session peer that new data has been enqueued.

Parameters

s	Stream session for which the event is to be generated.
block	Flag to indicate if call should block if event queue is full.

Returns

0 on succes or negative number if failed to send notification.

Definition at line 322 of file session.c.

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void stream_session_init_fifos_pointers	(	transport_connection_t *	tc,
		u32	rx_pointer,
		u32	tx_pointer
	)

Init fifo tail and head pointers.

Useful if transport uses absolute offsets for tracking ooo segments.

Definition at line 431 of file session.c.

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int stream_session_listen	(	stream_session_t *	s,
		transport_endpoint_t *	tep
	)

Ask transport to listen on local transport endpoint.

Parameters

s	Session for which listen will be called. Note that unlike established sessions, listen sessions are not associated to a thread.
tep	Local endpoint to be listened on.

Definition at line 676 of file session.c.

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u8 stream_session_no_space	(	transport_connection_t *	tc,
		u32	thread_index,
		u16	data_len
	)

Check if we have space in rx fifo to push more bytes.

Definition at line 275 of file session.c.

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int stream_session_open	(	u32	app_index,
		session_type_t	st,
		transport_endpoint_t *	rmt,
		transport_connection_t **	res
	)

Ask transport to open connection to remote transport endpoint.

Stores handle for matching request with reply since the call can be asynchronous. For instance, for TCP the 3-way handshake must complete before reply comes. Session is only created once connection is established.

Parameters

app_index	Index of the application requesting the connect
st	Session type requested.
tep	Remote transport endpoint
res	Resulting transport connection .

Definition at line 637 of file session.c.

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int stream_session_peek_bytes	(	transport_connection_t *	tc,
		u8 *	buffer,
		u32	offset,
		u32	max_bytes
	)

Definition at line 299 of file session.c.

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void stream_session_reset_notify

(

transport_connection_t *

tc

)

Notify application that connection has been reset.

Definition at line 580 of file session.c.

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int stream_session_stop_listen

(

stream_session_t *

s

)

Ask transport to stop listening on local transport endpoint.

Parameters

s	Session to stop listening on. It must be in state LISTENING.

Definition at line 707 of file session.c.

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u32 stream_session_tx_fifo_max_dequeue

(

transport_connection_t *

tc

)

Definition at line 290 of file session.c.

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clib_error_t* vnet_session_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 928 of file session.c.

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Variable Documentation

session_manager_main_t session_manager_main

Definition at line 28 of file session.c.

transport_proto_vft_t* tp_vfts

Per-type vector of transport protocol virtual function tables.

Definition at line 22 of file transport_interface.c.