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31 * @(#)if_ether.h 8.3 (Berkeley) 5/2/95
35 #ifndef _NETINET_IF_ETHER_H_
36 #define _NETINET_IF_ETHER_H_
38 #include <net/ethernet.h>
39 #include <net/if_arp.h>
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.
46 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
47 /* struct in_addr *ipaddr; */ \
48 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
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]; \
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.
62 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
63 /* struct in6_addr *ip6addr; */ \
64 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
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]; \
75 * Ethernet Address Resolution Protocol.
77 * See RFC 826 for protocol description. Structure below is adapted
78 * to resolving internet addresses. Field names used correspond to
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 */
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
94 #ifndef BURN_BRIDGES /* Can be used by third party software. */
95 struct sockaddr_inarp {
99 struct in_addr sin_addr;
100 struct in_addr sin_srcaddr;
105 #endif /* !BURN_BRIDGES */
108 * IP and ethernet specific routing flags
110 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
111 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
114 extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN];
115 extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN];
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 *);