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33 * @(#)if_ether.h 8.3 (Berkeley) 5/2/95
34 * $FreeBSD: src/sys/netinet/if_ether.h,v 1.24.2.1 2002/02/13 21:38:56 fjoe Exp $
37 #ifndef _NETINET_IF_ETHER_H_
38 #define _NETINET_IF_ETHER_H_
40 #include <net/ethernet.h>
41 #include <net/if_arp.h>
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.
48 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
49 /* struct in_addr *ipaddr; */ \
50 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
55 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
56 (enaddr)[4] = ((u_char *)ipaddr)[2]; \
57 (enaddr)[5] = ((u_char *)ipaddr)[3]; \
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.
64 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
65 /* struct in6_addr *ip6addr; */ \
66 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
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]; \
77 * Ethernet Address Resolution Protocol.
79 * See RFC 826 for protocol description. Structure below is adapted
80 * to resolving internet addresses. Field names used correspond to
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 */
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
96 struct sockaddr_inarp {
100 struct in_addr sin_addr;
101 struct in_addr sin_srcaddr;
107 * IP and ethernet specific routing flags
109 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
110 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
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;
117 int arpresolve __P((struct ifnet *, struct rtentry *, struct mbuf *,
118 struct sockaddr *, u_char *, struct rtentry *));
119 void arp_ifinit __P((struct ifnet *, struct ifaddr *));