mirror of https://github.com/ipxe/ipxe.git
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#ifndef _GPXE_INTERFACE_H
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#define _GPXE_INTERFACE_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/in.h>
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#include <gpxe/tables.h>
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struct pk_buff;
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struct net_protocol;
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struct tcpip_protocol;
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struct tcpip_net_protocol;
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/**
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* A transport-layer protocol of the TCPIP 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 netdev Network device
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* @v ll_source Link-layer source address
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*
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* This method takes ownership of the packet buffer.
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*/
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void ( * rx ) ( struct pk_buff *pkb, struct in_addr *src_net_addr, struct in_addr *dest_net_addr );
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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 trans_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 require
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* checksumming to be performed by the network layer. A positive number is
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* the offset of the checksum field in 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 TCPIP supporting network-layer protocol
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*/
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struct tcpip_net_protocol {
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/** Network protocol */
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struct net_protocol *net_protocol;
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/** Network address family */
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sa_family_t sa_family;
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/** Complete transport-layer checksum calculation
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*
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* @v pkb Packet buffer
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* @v tcpip Transport-layer protocol
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*
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*/
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void ( * tx_csum ) ( struct pk_buff *pkb,
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struct tcpip_protocol *tcpip );
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};
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/**
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* Register a 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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#define TCPIP_NET_PROTOCOL( protocol ) \
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struct tcpip_net_protocol protocol __table ( tcpip_net_protocols, 01 )
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extern void trans_rx ( struct pk_buff *pkb, uint8_t trans_proto,
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struct in_addr *src, struct in_addr *dest );
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extern int trans_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip,
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struct sockaddr *dest );
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extern uint16_t calc_chksum ( void *data, size_t len );
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extern struct tcpip_protocol * find_tcpip_protocol ( uint8_t trans_proto );
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extern struct tcpip_net_protocol * find_tcpip_net_protocol ( sa_family_t sa_family );
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#endif /* _GPXE_INTERFACE_H */
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