Transport layer
[Networking Stack]

Collaboration diagram for Transport layer:

Modules
	Internet Control Message Protocol (ICMP) Service
	User Datagram Protocol (UDP) Service
	Transmission Control Protocol (TCP) Service
Files
file	tl_interface.h
	Transport layer module interface for the underlying internetwork layer.
file	tl_common.c
	Transport layer common functions implementation.
file	tl_common.h
	Transport layer common functions.
file	tl_messages.h
	Transport layer modules messages.
Enumerations
enum	tl_messages { NET_TL_RECEIVED = NET_TL_FIRST }
	Transport layer modules messages. More...
Functions
	DEVICE_MAP_IMPLEMENT (packet_dimensions, packet_dimension_t)
int	tl_get_address_port (const struct sockaddr addr, int addrlen, uint16_t port)
	Gets the address port.
int	tl_get_ip_packet_dimension (int ip_phone, packet_dimensions_ref packet_dimensions, device_id_t device_id, packet_dimension_ref *packet_dimension)
	Gets IP packet dimensions.
int	tl_update_ip_packet_dimension (packet_dimensions_ref packet_dimensions, device_id_t device_id, size_t content)
	Updates IP device packet dimensions cache.
int	tl_set_address_port (struct sockaddr *addr, int addrlen, uint16_t port)
	Sets the address port.
int	tl_prepare_icmp_packet (int packet_phone, int icmp_phone, packet_t packet, services_t error)
	Prepares the packet for ICMP error notification.
int	tl_socket_read_packet_data (int packet_phone, packet_ref packet, size_t prefix, const packet_dimension_ref dimension, const struct sockaddr *addr, socklen_t addrlen)
	Receives data from the socket into a packet.
	DEVICE_MAP_DECLARE (packet_dimensions, packet_dimension_t)
	Device packet dimensions.
Transport layer module interface
This interface is used by other modules.
static int	tl_received_msg (int tl_phone, device_id_t device_id, packet_t packet, services_t target, services_t error)
	Notifies the remote transport layer modules about the received packet/s.

Enumeration Type Documentation

enum tl_messages

Transport layer modules messages.

Enumerator:

NET_TL_RECEIVED

Packet received message.

See also:: tl_received_msg()

Function Documentation

DEVICE_MAP_DECLARE	(	packet_dimensions	,
		packet_dimension_t
	)

Device packet dimensions.

Maps devices to the packet dimensions.

See also:: device.h

DEVICE_MAP_IMPLEMENT	(	packet_dimensions	,
		packet_dimension_t
	)

int tl_get_address_port	(	const struct sockaddr *	addr,
		int	addrlen,
		uint16_t *	port
	)

Gets the address port.

Supports AF_INET and AF_INET6 address families.

Parameters:

`[in,out]`	addr	The address to be updated.
`[in]`	addrlen	The address length.
`[out]`	port	The set port.

Returns:: EOK on success.; EINVAL if the address length does not match the address family.; EAFNOSUPPORT if the address family is not supported.

Referenced by tcp_connect_core(), and udp_sendto_message().

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int tl_get_ip_packet_dimension	(	int	ip_phone,
		packet_dimensions_ref	packet_dimensions,
		device_id_t	device_id,
		packet_dimension_ref *	packet_dimension
	)

Gets IP packet dimensions.

Tries to search a cache and queries the IP module if not found. The reply is cached then.

Parameters:

`[in]`	ip_phone	The IP moduel phone for (semi)remote calls.
`[in]`	packet_dimensions	The packet dimensions cache.
`[in]`	device_id	The device identifier.
`[out]`	packet_dimension	The IP packet dimensions.

Returns:: EOK on success.; EBADMEM if the packet_dimension parameter is NULL.; ENOMEM if there is not enough memory left.; EINVAL if the packet_dimensions cache is not valid.; Other codes as defined for the ip_packet_size_req() function.

Referenced by tcp_accept_message(), tcp_create_notification_packet(), tcp_process_client_messages(), tcp_queue_received_packet(), tcp_send_message(), udp_process_client_messages(), and udp_process_packet().

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int tl_prepare_icmp_packet	(	int	packet_phone,
		int	icmp_phone,
		packet_t	packet,
		services_t	error
	)

Prepares the packet for ICMP error notification.

Keeps the first packet and releases all the others. Releases all the packets on error.

Parameters:

`[in]`	packet_phone	The packet server module phone.
`[in]`	icmp_phone	The ICMP module phone.
`[in]`	packet	The packet to be send.
`[in]`	error	The packet error reporting service. Prefixes the received packet.

Returns:: EOK on success.; ENOENT if no packet may be sent.

Referenced by tcp_process_packet(), and udp_process_packet().

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static int tl_received_msg	(	int	tl_phone,
		device_id_t	device_id,
		packet_t	packet,
		services_t	target,
		services_t	error
	)			`[inline, static]`

Notifies the remote transport layer modules about the received packet/s.

Parameters:

`[in]`	tl_phone	The transport layer module phone used for remote calls.
`[in]`	device_id	The device identifier.
`[in]`	packet	The received packet or the received packet queue. The packet queue is used to carry a~fragmented datagram. The first packet contains the headers, the others contain only data.
`[in]`	target	The target transport layer module service to be delivered to.
`[in]`	error	The packet error reporting service. Prefixes the received packet.

Returns:: EOK on success.

References generic_received_msg(), NET_TL_RECEIVED, and packet_get_id().

Referenced by ip_deliver_local().

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int tl_set_address_port	(	struct sockaddr *	addr,
		int	addrlen,
		uint16_t	port
	)

Sets the address port.

Supports AF_INET and AF_INET6 address families.

Parameters:

`[in,out]`	addr	The address to be updated.
`[in]`	addrlen	The address length.
`[in]`	port	The port to be set.

Returns:: EOK on success.; EINVAL if the address length does not match the address family.; EAFNOSUPPORT if the address family is not supported.

Referenced by tcp_process_listen(), tcp_process_packet(), and udp_recvfrom_message().

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int tl_socket_read_packet_data	(	int	packet_phone,
		packet_ref	packet,
		size_t	prefix,
		const packet_dimension_ref	dimension,
		const struct sockaddr *	addr,
		socklen_t	addrlen
	)

Receives data from the socket into a packet.

Parameters:

`[in]`	packet_phone	The packet server module phone.
`[out]`	packet	The new created packet.
`[in]`	prefix	Reserved packet data prefix length.
`[in]`	dimension	The packet dimension.
`[in]`	addr	The destination address.
`[in]`	addrlen	The address length.

Returns:: Number of bytes received.; EINVAL if the client does not send data.; ENOMEM if there is not enough memory left.; Other error codes as defined for the async_data_read_finalize() function.

Referenced by tcp_send_message(), and udp_sendto_message().

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int tl_update_ip_packet_dimension	(	packet_dimensions_ref	packet_dimensions,
		device_id_t	device_id,
		size_t	content
	)

Updates IP device packet dimensions cache.

Parameters:

`[in,out]`	packet_dimensions	The packet dimensions cache.
`[in]`	device_id	The device identifier.
`[in]`	content	The new maximum content size.

Returns:: EOK on success.; ENOENT if the packet dimension is not cached.

Transport layer [Networking Stack]

Modules

Files

Enumerations

Functions

Transport layer module interface

Enumeration Type Documentation

Function Documentation

Transport layer
[Networking Stack]