The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
   34  * $FreeBSD: releng/5.0/sys/netinet/if_ether.h 93085 2002-03-24 10:19:10Z bde $
   35  */
   36 
   37 #ifndef _NETINET_IF_ETHER_H_
   38 #define _NETINET_IF_ETHER_H_
   39 
   40 #include <net/ethernet.h>
   41 #include <net/if_arp.h>
   42 
   43 /*
   44  * Macro to map an IP multicast address to an Ethernet multicast address.
   45  * The high-order 25 bits of the Ethernet address are statically assigned,
   46  * and the low-order 23 bits are taken from the low end of the IP address.
   47  */
   48 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
   49         /* struct in_addr *ipaddr; */ \
   50         /* u_char enaddr[ETHER_ADDR_LEN];          */ \
   51 { \
   52         (enaddr)[0] = 0x01; \
   53         (enaddr)[1] = 0x00; \
   54         (enaddr)[2] = 0x5e; \
   55         (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
   56         (enaddr)[4] = ((u_char *)ipaddr)[2]; \
   57         (enaddr)[5] = ((u_char *)ipaddr)[3]; \
   58 }
   59 /*
   60  * Macro to map an IP6 multicast address to an Ethernet multicast address.
   61  * The high-order 16 bits of the Ethernet address are statically assigned,
   62  * and the low-order 32 bits are taken from the low end of the IP6 address.
   63  */
   64 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr)                       \
   65 /* struct       in6_addr *ip6addr; */                                   \
   66 /* u_char       enaddr[ETHER_ADDR_LEN]; */                              \
   67 {                                                                       \
   68         (enaddr)[0] = 0x33;                                             \
   69         (enaddr)[1] = 0x33;                                             \
   70         (enaddr)[2] = ((u_char *)ip6addr)[12];                          \
   71         (enaddr)[3] = ((u_char *)ip6addr)[13];                          \
   72         (enaddr)[4] = ((u_char *)ip6addr)[14];                          \
   73         (enaddr)[5] = ((u_char *)ip6addr)[15];                          \
   74 }
   75 
   76 /*
   77  * Ethernet Address Resolution Protocol.
   78  *
   79  * See RFC 826 for protocol description.  Structure below is adapted
   80  * to resolving internet addresses.  Field names used correspond to
   81  * RFC 826.
   82  */
   83 struct  ether_arp {
   84         struct  arphdr ea_hdr;  /* fixed-size header */
   85         u_char  arp_sha[ETHER_ADDR_LEN];        /* sender hardware address */
   86         u_char  arp_spa[4];     /* sender protocol address */
   87         u_char  arp_tha[ETHER_ADDR_LEN];        /* target hardware address */
   88         u_char  arp_tpa[4];     /* target protocol address */
   89 };
   90 #define arp_hrd ea_hdr.ar_hrd
   91 #define arp_pro ea_hdr.ar_pro
   92 #define arp_hln ea_hdr.ar_hln
   93 #define arp_pln ea_hdr.ar_pln
   94 #define arp_op  ea_hdr.ar_op
   95 
   96 struct sockaddr_inarp {
   97         u_char  sin_len;
   98         u_char  sin_family;
   99         u_short sin_port;
  100         struct  in_addr sin_addr;
  101         struct  in_addr sin_srcaddr;
  102         u_short sin_tos;
  103         u_short sin_other;
  104 #define SIN_PROXY 1
  105 };
  106 /*
  107  * IP and ethernet specific routing flags
  108  */
  109 #define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
  110 #define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */
  111 
  112 #ifdef  _KERNEL
  113 extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
  114 extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
  115 extern struct   ifqueue arpintrq;
  116 
  117 int     arpresolve(struct ifnet *, struct rtentry *, struct mbuf *,
  118             struct sockaddr *, u_char *, struct rtentry *);
  119 void    arp_ifinit(struct ifnet *, struct ifaddr *);
  120 #endif
  121 
  122 #endif

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