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31 * @(#)if_ether.h 8.3 (Berkeley) 5/2/95
34 #ifndef _NETINET_IF_ETHER_H_
35 #define _NETINET_IF_ETHER_H_
37 #include <net/ethernet.h>
38 #include <net/if_arp.h>
41 * Macro to map an IP multicast address to an Ethernet multicast address.
42 * The high-order 25 bits of the Ethernet address are statically assigned,
43 * and the low-order 23 bits are taken from the low end of the IP address.
45 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
46 /* struct in_addr *ipaddr; */ \
47 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
52 (enaddr)[3] = ((const u_char *)ipaddr)[1] & 0x7f; \
53 (enaddr)[4] = ((const u_char *)ipaddr)[2]; \
54 (enaddr)[5] = ((const u_char *)ipaddr)[3]; \
57 * Macro to map an IP6 multicast address to an Ethernet multicast address.
58 * The high-order 16 bits of the Ethernet address are statically assigned,
59 * and the low-order 32 bits are taken from the low end of the IP6 address.
61 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
62 /* struct in6_addr *ip6addr; */ \
63 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
67 (enaddr)[2] = ((const u_char *)ip6addr)[12]; \
68 (enaddr)[3] = ((const u_char *)ip6addr)[13]; \
69 (enaddr)[4] = ((const u_char *)ip6addr)[14]; \
70 (enaddr)[5] = ((const u_char *)ip6addr)[15]; \
74 * Ethernet Address Resolution Protocol.
76 * See RFC 826 for protocol description. Structure below is adapted
77 * to resolving internet addresses. Field names used correspond to
81 struct arphdr ea_hdr; /* fixed-size header */
82 u_char arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
83 u_char arp_spa[4]; /* sender protocol address */
84 u_char arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
85 u_char arp_tpa[4]; /* target protocol address */
87 #define arp_hrd ea_hdr.ar_hrd
88 #define arp_pro ea_hdr.ar_pro
89 #define arp_hln ea_hdr.ar_hln
90 #define arp_pln ea_hdr.ar_pln
91 #define arp_op ea_hdr.ar_op
93 #ifndef BURN_BRIDGES /* Can be used by third party software. */
94 struct sockaddr_inarp {
98 struct in_addr sin_addr;
99 struct in_addr sin_srcaddr;
104 #endif /* !BURN_BRIDGES */
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];
119 int arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
120 const struct sockaddr *dst, u_char *desten, uint32_t *pflags,
121 struct llentry **plle);
122 void arprequest(struct ifnet *, const struct in_addr *,
123 const struct in_addr *, u_char *);
124 void arp_ifinit(struct ifnet *, struct ifaddr *);
125 void arp_announce_ifaddr(struct ifnet *, struct in_addr addr, u_char *);