#ifndef _GPXE_TCPIP_H
#define _GPXE_TCPIP_H
/** @file
*
* Transport-network layer interface
*
*/
#include <stdint.h>
#include <gpxe/socket.h>
#include <gpxe/in.h>
#include <gpxe/tables.h>
struct pk_buff;
struct net_device;
/** Empty checksum value
*
* This is the TCP/IP checksum over a zero-length block of data.
*/
#define TCPIP_EMPTY_CSUM 0xffff
/** Length of a @c struct @c sockaddr_tcpip */
#define SA_TCPIP_LEN 32
/**
* TCP/IP socket address
*
* This contains the fields common to socket addresses for all TCP/IP
* address families.
*/
struct sockaddr_tcpip {
/** Socket address family (part of struct @c sockaddr) */
sa_family_t st_family;
/** TCP/IP port */
uint16_t st_port;
/** Padding
*
* This ensures that a struct @c sockaddr_tcpip is large
* enough to hold a socket address for any TCP/IP address
* family.
*/
char pad[SA_TCPIP_LEN - sizeof ( sa_family_t ) - sizeof ( uint16_t )];
};
/**
* A transport-layer protocol of the TCP/IP stack (eg. UDP, TCP, etc)
*/
struct tcpip_protocol {
/** Protocol name */
const char *name;
/**
* Process received packet
*
* @v pkb Packet buffer
* @v st_src Partially-filled source address
* @v st_dest Partially-filled destination address
* @v pshdr_csum Pseudo-header checksum
* @ret rc Return status code
*
* This method takes ownership of the packet buffer.
*/
int ( * rx ) ( struct pk_buff *pkb, struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
/**
* Transport-layer protocol number
*
* This is a constant of the type IP_XXX
*/
uint8_t tcpip_proto;
};
/**
* A network-layer protocol of the TCP/IP stack (eg. IPV4, IPv6, etc)
*/
struct tcpip_net_protocol {
/** Protocol name */
const char *name;
/** Network address family */
sa_family_t sa_family;
/**
* Transmit packet
*
* @v pkb Packet buffer
* @v tcpip_protocol Transport-layer protocol
* @v st_dest Destination address
* @v netdev Network device (or NULL to route automatically)
* @v trans_csum Transport-layer checksum to complete, or NULL
* @ret rc Return status code
*
* This function takes ownership of the packet buffer.
*/
int ( * tx ) ( struct pk_buff *pkb,
struct tcpip_protocol *tcpip_protocol,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum );
};
/** Declare a TCP/IP transport-layer protocol */
#define __tcpip_protocol __table ( tcpip_protocols, 01 )
/** Declare a TCP/IP network-layer protocol */
#define __tcpip_net_protocol __table ( tcpip_net_protocols, 01 )
extern int tcpip_rx ( struct pk_buff *pkb, uint8_t tcpip_proto,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
extern int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum );
extern uint16_t tcpip_continue_chksum ( uint16_t partial,
const void *data, size_t len );
extern uint16_t tcpip_chksum ( const void *data, size_t len );
#endif /* _GPXE_TCPIP_H */
