sys/netinet/if_ether.h

   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
  32 #ifndef _NETINET_IF_ETHER_H_
  33 #define _NETINET_IF_ETHER_H_
  34
  35 #include <net/ethernet.h>
  36 #include <net/if_arp.h>
  37
  38 /*
  39  * Macro to map an IP multicast address to an Ethernet multicast address.
  40  * The high-order 25 bits of the Ethernet address are statically assigned,
  41  * and the low-order 23 bits are taken from the low end of the IP address.
  42  */
  43 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
  44         /* struct in_addr *ipaddr; */ \
  45         /* u_char enaddr[ETHER_ADDR_LEN];          */ \
  46 { \
  47         (enaddr)[0] = 0x01; \
  48         (enaddr)[1] = 0x00; \
  49         (enaddr)[2] = 0x5e; \
  50         (enaddr)[3] = ((const u_char *)ipaddr)[1] & 0x7f; \
  51         (enaddr)[4] = ((const u_char *)ipaddr)[2]; \
  52         (enaddr)[5] = ((const u_char *)ipaddr)[3]; \
  53 }
  54 /*
  55  * Macro to map an IP6 multicast address to an Ethernet multicast address.
  56  * The high-order 16 bits of the Ethernet address are statically assigned,
  57  * and the low-order 32 bits are taken from the low end of the IP6 address.
  58  */
  59 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr)                       \
  60 /* struct       in6_addr *ip6addr; */                                   \
  61 /* u_char       enaddr[ETHER_ADDR_LEN]; */                              \
  62 {                                                                       \
  63         (enaddr)[0] = 0x33;                                             \
  64         (enaddr)[1] = 0x33;                                             \
  65         (enaddr)[2] = ((const u_char *)ip6addr)[12];                    \
  66         (enaddr)[3] = ((const u_char *)ip6addr)[13];                    \
  67         (enaddr)[4] = ((const u_char *)ip6addr)[14];                    \
  68         (enaddr)[5] = ((const u_char *)ip6addr)[15];                    \
  69 }
  70
  71 /*
  72  * Ethernet Address Resolution Protocol.
  73  *
  74  * See RFC 826 for protocol description.  Structure below is adapted
  75  * to resolving internet addresses.  Field names used correspond to
  76  * RFC 826.
  77  */
  78 struct  ether_arp {
  79         struct  arphdr ea_hdr;  /* fixed-size header */
  80         u_char  arp_sha[ETHER_ADDR_LEN];        /* sender hardware address */
  81         u_char  arp_spa[4];     /* sender protocol address */
  82         u_char  arp_tha[ETHER_ADDR_LEN];        /* target hardware address */
  83         u_char  arp_tpa[4];     /* target protocol address */
  84 };
  85 #define arp_hrd ea_hdr.ar_hrd
  86 #define arp_pro ea_hdr.ar_pro
  87 #define arp_hln ea_hdr.ar_hln
  88 #define arp_pln ea_hdr.ar_pln
  89 #define arp_op  ea_hdr.ar_op
  90
  91 #ifndef BURN_BRIDGES    /* Can be used by third party software. */
  92 struct sockaddr_inarp {
  93         u_char  sin_len;
  94         u_char  sin_family;
  95         u_short sin_port;
  96         struct  in_addr sin_addr;
  97         struct  in_addr sin_srcaddr;
  98         u_short sin_tos;
  99         u_short sin_other;
 100 #define SIN_PROXY 1
 101 };
 102 #endif /* !BURN_BRIDGES  */
 103
 104 /*
 105  * IP and ethernet specific routing flags
 106  */
 107 #define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
 108 #define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */
 109
 110 #ifdef  _KERNEL
 111 extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
 112 extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
 113
 114 struct ifaddr;
 115 struct llentry;
 116
 117 int     arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
 118             const struct sockaddr *dst, u_char *desten, uint32_t *pflags,
 119             struct llentry **plle);
 120 void    arprequest(struct ifnet *, const struct in_addr *,
 121             const struct in_addr *, u_char *);
 122 void    arp_ifinit(struct ifnet *, struct ifaddr *);
 123 void    arp_announce_ifaddr(struct ifnet *, struct in_addr addr, u_char *);
 124 #endif
 125
 126 #endif