467e9627cc
Introduced struct sockaddr_tcpip, to simplify code that deals with both IPv4 and IPv6 addresses. Reorganised parts of tcpip.c and udp.c.
123 lines
3.1 KiB
C
123 lines
3.1 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 pk_buff;
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#define SA_TCPIP_LEN 32
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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[SA_TCPIP_LEN - sizeof ( sa_family_t ) - sizeof ( uint16_t )];
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};
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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 pkb Packet 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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* @ret rc Return status code
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*
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* This method takes ownership of the packet buffer.
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*/
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int ( * rx ) ( struct pk_buff *pkb, struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest );
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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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* Checksum offset
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*
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* A negative number indicates that the protocol does not
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* require checksumming to be performed by the network layer.
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* A positive number is the offset of the checksum field in
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* the transport-layer header.
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*/
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int csum_offset;
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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 pkb Packet buffer
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* @v tcpip_protocol Transport-layer protocol
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* @v st_dest Destination address
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* @ret rc Return status code
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*
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* This function takes ownership of the packet buffer.
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*/
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int ( * tx ) ( struct pk_buff *pkb,
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struct tcpip_protocol *tcpip_protocol,
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struct sockaddr_tcpip *st_dest );
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};
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/**
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* Register a TCP/IP transport-layer protocol
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*
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* @v protocol Transport-layer protocol
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*/
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#define TCPIP_PROTOCOL( protocol ) \
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struct tcpip_protocol protocol __table ( tcpip_protocols, 01 )
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/**
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* Register a TCP/IP network-layer protocol
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*
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* @v protocol Network-layer protocol
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*/
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#define TCPIP_NET_PROTOCOL( protocol ) \
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struct tcpip_net_protocol protocol __table ( tcpip_net_protocols, 01 )
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extern int tcpip_rx ( struct pk_buff *pkb, uint8_t tcpip_proto,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest );
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extern int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip,
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struct sockaddr_tcpip *st_dest );
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extern unsigned int tcpip_continue_chksum ( unsigned int partial,
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const void *data, size_t len );
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extern unsigned int tcpip_chksum ( const void *data, size_t len );
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#endif /* _GPXE_TCPIP_H */
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