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#ifndef _GPXE_INTERFACE_H
#define _GPXE_INTERFACE_H
/** @file
*
* Transport-network layer interface
*
*/
#include <stdint.h>
#include <gpxe/in.h>
#include <gpxe/tables.h>
struct pk_buff;
struct net_protocol;
struct trans_protocol;
struct tcpip_net_protocol;
/**
* A transport-layer protocol
*/
struct trans_protocol {
/** Protocol name */
const char *name;
/**
* Process received packet
*
* @v pkb Packet buffer
* @v netdev Network device
* @v ll_source Link-layer source address
*
* This method takes ownership of the packet buffer.
*/
void ( * rx ) ( struct pk_buff *pkb, struct in_addr *src_net_addr, struct in_addr *dest_net_addr );
/**
* Transport-layer protocol number
*
* This is a constant of the type IP_XXX
*/
uint8_t trans_proto;
};
/**
* A TCPIP supporting protocol
*/
struct tcpip_net_protocol {
/** Network protocol */
struct net_protocol *net_protocol;
/** Network address family */
sa_family_t sa_family;
/** Complete transport-layer checksum calculation
*
* @v pkb Packet buffer
* @v trans_proto Transport-layer protocol number
*
* This function expects a network-layer datagram in its packet with the protocol field in the
* IP header to be filled up. It constructs a psuedo-header using the information provided in
* the IP header and computes the checksum over the pseudo-header. The checksum offset in the
* transport layer header can be determined without the need of an offset value as
*
* void *csum_offset = pkb->data + NET_HLEN + csum_offset ( trans_proto );
*
* where,
* csum_offset ( IP_TCP ) = 16
* csum_offset ( IP_UDP ) = 6
*/
void ( * tx_csum ) ( struct pk_buff *pkb );
};
/**
* Register a transport-layer protocol
*
* @v protocol Transport-layer protocol
*/
#define TRANS_PROTOCOL( protocol ) \
struct trans_protocol protocol __table ( trans_protocols, 01 )
#define TCPIP_NET_PROTOCOL( protocol ) \
struct tcpip_net_protocol protocol __table ( tcpip_net_protocols, 01 )
extern void trans_rx ( struct pk_buff *pkb, uint8_t trans_proto, struct in_addr *src, struct in_addr *dest );
extern int trans_tx ( struct pk_buff *pkb, uint8_t trans_proto, struct sockaddr *dest );
extern uint16_t calc_chksum ( void *data, size_t len );
/** Do we need these functions? -Nikhil, 24-6-06 */
extern struct trans_protocol * find_trans_protocol ( uint8_t trans_proto );
extern struct tcpip_net_protocol * find_tcpip_net_protocol ( sa_family_t sa_family );
#endif /* _GPXE_INTERFACE_H */
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