mirror of https://github.com/ipxe/ipxe.git
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
#ifndef _GPXE_TCPIP_H
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#define _GPXE_TCPIP_H
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/** @file
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*
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* Transport-network layer interface
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*
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*/
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#include <stdint.h>
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#include <gpxe/socket.h>
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#include <gpxe/in.h>
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#include <gpxe/tables.h>
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struct io_buffer;
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struct net_device;
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/** Empty checksum value
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*
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* This is the TCP/IP checksum over a zero-length block of data.
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*/
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#define TCPIP_EMPTY_CSUM 0xffff
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/**
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* TCP/IP socket address
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*
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* This contains the fields common to socket addresses for all TCP/IP
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* address families.
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*/
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struct sockaddr_tcpip {
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/** Socket address family (part of struct @c sockaddr) */
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sa_family_t st_family;
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/** TCP/IP port */
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uint16_t st_port;
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/** Padding
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*
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* This ensures that a struct @c sockaddr_tcpip is large
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* enough to hold a socket address for any TCP/IP address
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* family.
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*/
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char pad[ sizeof ( struct sockaddr ) -
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( sizeof ( sa_family_t ) + sizeof ( uint16_t ) ) ];
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} __attribute__ (( may_alias ));
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/**
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* A transport-layer protocol of the TCP/IP stack (eg. UDP, TCP, etc)
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*/
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struct tcpip_protocol {
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/** Protocol name */
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const char *name;
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/**
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* Process received packet
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*
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* @v iobuf I/O buffer
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* @v st_src Partially-filled source address
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* @v st_dest Partially-filled destination address
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* @v pshdr_csum Pseudo-header checksum
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* @ret rc Return status code
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*
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* This method takes ownership of the I/O buffer.
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*/
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int ( * rx ) ( struct io_buffer *iobuf, struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
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/**
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* Transport-layer protocol number
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*
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* This is a constant of the type IP_XXX
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*/
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uint8_t tcpip_proto;
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};
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/**
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* A network-layer protocol of the TCP/IP stack (eg. IPV4, IPv6, etc)
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*/
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struct tcpip_net_protocol {
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/** Protocol name */
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const char *name;
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/** Network address family */
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sa_family_t sa_family;
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/**
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* Transmit packet
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*
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* @v iobuf I/O buffer
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* @v tcpip_protocol Transport-layer protocol
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* @v st_src Source address, or NULL to use default
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* @v st_dest Destination address
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* @v netdev Network device (or NULL to route automatically)
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* @v trans_csum Transport-layer checksum to complete, or NULL
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* @ret rc Return status code
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*
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* This function takes ownership of the I/O buffer.
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*/
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int ( * tx ) ( struct io_buffer *iobuf,
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struct tcpip_protocol *tcpip_protocol,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest,
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struct net_device *netdev,
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uint16_t *trans_csum );
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};
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/** Declare a TCP/IP transport-layer protocol */
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#define __tcpip_protocol \
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__table ( struct tcpip_protocol, tcpip_protocols, 01 )
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/** Declare a TCP/IP network-layer protocol */
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#define __tcpip_net_protocol \
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__table ( struct tcpip_net_protocol, tcpip_net_protocols, 01 )
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extern int tcpip_rx ( struct io_buffer *iobuf, uint8_t tcpip_proto,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
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extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest,
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struct net_device *netdev,
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uint16_t *trans_csum );
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extern uint16_t tcpip_continue_chksum ( uint16_t partial,
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const void *data, size_t len );
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extern uint16_t tcpip_chksum ( const void *data, size_t len );
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#endif /* _GPXE_TCPIP_H */
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