FreeBSD/Linux Kernel Cross Reference
sys/netinet/if_ether.h

     /*
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
     * $FreeBSD: src/sys/netinet/if_ether.h,v 1.24.2.1 2002/02/13 21:38:56 fjoe Exp $
     * $DragonFly: src/sys/netinet/if_ether.h,v 1.7 2007/08/16 20:03:57 dillon Exp $
     */
    
    #ifndef _NETINET_IF_ETHER_H_
    #define _NETINET_IF_ETHER_H_
    
    #ifndef _NET_ETHERNET_H_
    #include <net/ethernet.h>
    #endif
    #ifndef _NET_IF_ARP_H_
    #include <net/if_arp.h>
    #endif
    #ifndef _NETINET_IN_H_
    #include <netinet/in.h>
    #endif
    
    /*
     * Macro to map an IP multicast address to an Ethernet multicast address.
     * The high-order 25 bits of the Ethernet address are statically assigned,
     * and the low-order 23 bits are taken from the low end of the IP address.
     */
    #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
            /* struct in_addr *ipaddr; */ \
            /* u_char enaddr[ETHER_ADDR_LEN];          */ \
    { \
            (enaddr)[0] = 0x01; \
            (enaddr)[1] = 0x00; \
            (enaddr)[2] = 0x5e; \
            (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
            (enaddr)[4] = ((u_char *)ipaddr)[2]; \
            (enaddr)[5] = ((u_char *)ipaddr)[3]; \
    }
    /*
     * Macro to map an IP6 multicast address to an Ethernet multicast address.
     * The high-order 16 bits of the Ethernet address are statically assigned,
     * and the low-order 32 bits are taken from the low end of the IP6 address.
     */
    #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr)                       \
    /* struct       in6_addr *ip6addr; */                                   \
    /* u_char       enaddr[ETHER_ADDR_LEN]; */                              \
    {                                                                       \
            (enaddr)[0] = 0x33;                                             \
            (enaddr)[1] = 0x33;                                             \
            (enaddr)[2] = ((u_char *)ip6addr)[12];                          \
            (enaddr)[3] = ((u_char *)ip6addr)[13];                          \
            (enaddr)[4] = ((u_char *)ip6addr)[14];                          \
            (enaddr)[5] = ((u_char *)ip6addr)[15];                          \
    }
    
    /*
     * Ethernet Address Resolution Protocol.
     *
     * See RFC 826 for protocol description.  Structure below is adapted
     * to resolving internet addresses.  Field names used correspond to
     * RFC 826.
     */
    struct  ether_arp {
            struct  arphdr ea_hdr;  /* fixed-size header */
            u_char  arp_sha[ETHER_ADDR_LEN];        /* sender hardware address */
            u_char  arp_spa[4];     /* sender protocol address */
            u_char  arp_tha[ETHER_ADDR_LEN];        /* target hardware address */
            u_char  arp_tpa[4];     /* target protocol address */
    };
    #define arp_hrd ea_hdr.ar_hrd
    #define arp_pro ea_hdr.ar_pro
   #define arp_hln ea_hdr.ar_hln
   #define arp_pln ea_hdr.ar_pln
   #define arp_op  ea_hdr.ar_op
   
   struct sockaddr_inarp {
           u_char  sin_len;
           u_char  sin_family;
           u_short sin_port;
           struct  in_addr sin_addr;
           struct  in_addr sin_srcaddr;
           u_short sin_tos;
           u_short sin_other;
   #define SIN_PROXY 1
   };
   /*
    * IP and ethernet specific routing flags
    */
   #define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
   #define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */
   
   #ifdef  _KERNEL
   extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
   extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
   
   int     arpresolve (struct ifnet *, struct rtentry *, struct mbuf *,
                           struct sockaddr *, u_char *);
   void    arp_ifinit (struct ifnet *, struct ifaddr *);
   void    arp_gratuitous (struct ifnet *, struct ifaddr *);
   #endif
   
   #endif

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