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 */
78struct 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. */
92struct 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
111extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN];
112extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN];
113
114struct ifaddr;
115struct llentry;
116
117int 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);
120void arprequest(struct ifnet *, const struct in_addr *,
121 const struct in_addr *, u_char *);
122void arp_ifinit(struct ifnet *, struct ifaddr *);
123void arp_announce_ifaddr(struct ifnet *, struct in_addr addr, u_char *);
124#endif
125
126#endif