icmp.h

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#ifndef _IPXE_ICMP_H
#define _IPXE_ICMP_H

/** @file
 *
 * ICMP protocol
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>
#include <ipxe/iobuf.h>
#include <ipxe/socket.h>
#include <ipxe/tcpip.h>
#include <ipxe/tables.h>

/** An ICMP header */
struct icmp_header {
        /** Type */
        uint8_t type;
        /** Code */
        uint8_t code;
        /** Checksum */
        uint16_t chksum;
} __attribute__ (( packed ));

/** An ICMP echo request/reply */
struct icmp_echo {
        /** ICMPv6 header */
        struct icmp_header icmp;
        /** Identifier */
        uint16_t ident;
        /** Sequence number */
        uint16_t sequence;
        /** Data */
        uint8_t data[0];
} __attribute__ (( packed ));

/** An ICMP echo protocol */
struct icmp_echo_protocol {
        /** Address family */
        sa_family_t family;
        /** Request type */
        uint8_t request;
        /** Reply type */
        uint8_t reply;
        /** TCP/IP protocol */
        struct tcpip_protocol *tcpip_protocol;
        /** Include network-layer checksum within packet */
        int net_checksum;
};

/** ICMP echo protocol table */
#define ICMP_ECHO_PROTOCOLS \
        __table ( struct icmp_echo_protocol, "icmp_echo_protocols" )

/** Declare an ICMP echo protocol */
#define __icmp_echo_protocol __table_entry ( ICMP_ECHO_PROTOCOLS, 01 )

#define ICMP_ECHO_REPLY 0
#define ICMP_ECHO_REQUEST 8

extern int icmp_tx_echo_request ( struct io_buffer *iobuf,
                                  struct sockaddr_tcpip *st_dest );

extern int icmp_rx_echo_request ( struct io_buffer *iobuf,
                                  struct sockaddr_tcpip *st_src,
                                  struct icmp_echo_protocol *echo_protocol );
extern int icmp_rx_echo_reply ( struct io_buffer *iobuf,
                                struct sockaddr_tcpip *st_src );

#endif /* _IPXE_ICMP_H */