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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
   32  * $FreeBSD: releng/12.0/sys/netinet/if_ether.h 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 
   35 #ifndef _NETINET_IF_ETHER_H_
   36 #define _NETINET_IF_ETHER_H_
   37 
   38 #include <net/ethernet.h>
   39 #include <net/if_arp.h>
   40 
   41 /*
   42  * Macro to map an IP multicast address to an Ethernet multicast address.
   43  * The high-order 25 bits of the Ethernet address are statically assigned,
   44  * and the low-order 23 bits are taken from the low end of the IP address.
   45  */
   46 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
   47         /* struct in_addr *ipaddr; */ \
   48         /* u_char enaddr[ETHER_ADDR_LEN];          */ \
   49 { \
   50         (enaddr)[0] = 0x01; \
   51         (enaddr)[1] = 0x00; \
   52         (enaddr)[2] = 0x5e; \
   53         (enaddr)[3] = ((const u_char *)ipaddr)[1] & 0x7f; \
   54         (enaddr)[4] = ((const u_char *)ipaddr)[2]; \
   55         (enaddr)[5] = ((const u_char *)ipaddr)[3]; \
   56 }
   57 /*
   58  * Macro to map an IP6 multicast address to an Ethernet multicast address.
   59  * The high-order 16 bits of the Ethernet address are statically assigned,
   60  * and the low-order 32 bits are taken from the low end of the IP6 address.
   61  */
   62 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr)                       \
   63 /* struct       in6_addr *ip6addr; */                                   \
   64 /* u_char       enaddr[ETHER_ADDR_LEN]; */                              \
   65 {                                                                       \
   66         (enaddr)[0] = 0x33;                                             \
   67         (enaddr)[1] = 0x33;                                             \
   68         (enaddr)[2] = ((const u_char *)ip6addr)[12];                    \
   69         (enaddr)[3] = ((const u_char *)ip6addr)[13];                    \
   70         (enaddr)[4] = ((const u_char *)ip6addr)[14];                    \
   71         (enaddr)[5] = ((const u_char *)ip6addr)[15];                    \
   72 }
   73 
   74 /*
   75  * Ethernet Address Resolution Protocol.
   76  *
   77  * See RFC 826 for protocol description.  Structure below is adapted
   78  * to resolving internet addresses.  Field names used correspond to
   79  * RFC 826.
   80  */
   81 struct  ether_arp {
   82         struct  arphdr ea_hdr;  /* fixed-size header */
   83         u_char  arp_sha[ETHER_ADDR_LEN];        /* sender hardware address */
   84         u_char  arp_spa[4];     /* sender protocol address */
   85         u_char  arp_tha[ETHER_ADDR_LEN];        /* target hardware address */
   86         u_char  arp_tpa[4];     /* target protocol address */
   87 };
   88 #define arp_hrd ea_hdr.ar_hrd
   89 #define arp_pro ea_hdr.ar_pro
   90 #define arp_hln ea_hdr.ar_hln
   91 #define arp_pln ea_hdr.ar_pln
   92 #define arp_op  ea_hdr.ar_op
   93 
   94 #ifndef BURN_BRIDGES    /* Can be used by third party software. */
   95 struct sockaddr_inarp {
   96         u_char  sin_len;
   97         u_char  sin_family;
   98         u_short sin_port;
   99         struct  in_addr sin_addr;
  100         struct  in_addr sin_srcaddr;
  101         u_short sin_tos;
  102         u_short sin_other;
  103 #define SIN_PROXY 1
  104 };
  105 #endif /* !BURN_BRIDGES  */
  106 
  107 /*
  108  * IP and ethernet specific routing flags
  109  */
  110 #define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
  111 #define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */
  112 
  113 #ifdef  _KERNEL
  114 extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
  115 extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
  116 
  117 struct ifaddr;
  118 struct llentry;
  119 
  120 int     arpresolve_addr(struct ifnet *ifp, int flags,
  121             const struct sockaddr *dst, char *desten, uint32_t *pflags,
  122             struct llentry **plle);
  123 int     arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
  124             const struct sockaddr *dst, u_char *desten, uint32_t *pflags,
  125             struct llentry **plle);
  126 void    arprequest(struct ifnet *, const struct in_addr *,
  127             const struct in_addr *, u_char *);
  128 void    arp_ifinit(struct ifnet *, struct ifaddr *);
  129 void    arp_announce_ifaddr(struct ifnet *, struct in_addr addr, u_char *);
  130 #endif
  131 
  132 #endif

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