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 * @(#)if_ether.h 8.3 (Berkeley) 5/2/95
32 * $FreeBSD: releng/12.0/sys/netinet/if_ether.h 326023 2017-11-20 19:43:44Z pfg $
33 */
34
35 #ifndef _NETINET_IF_ETHER_H_
36 #define _NETINET_IF_ETHER_H_
37
38 #include <net/ethernet.h>
39 #include <net/if_arp.h>
40
41 /*
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.
45 */
46 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
47 /* struct in_addr *ipaddr; */ \
48 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
49 { \
50 (enaddr)[0] = 0x01; \
51 (enaddr)[1] = 0x00; \
52 (enaddr)[2] = 0x5e; \
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]; \
56 }
57 /*
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.
61 */
62 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
63 /* struct in6_addr *ip6addr; */ \
64 /* u_char enaddr[ETHER_ADDR_LEN]; */ \
65 { \
66 (enaddr)[0] = 0x33; \
67 (enaddr)[1] = 0x33; \
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]; \
72 }
73
74 /*
75 * Ethernet Address Resolution Protocol.
76 *
77 * See RFC 826 for protocol description. Structure below is adapted
78 * to resolving internet addresses. Field names used correspond to
79 * RFC 826.
80 */
81 struct ether_arp {
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 */
87 };
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
93
94 #ifndef BURN_BRIDGES /* Can be used by third party software. */
95 struct sockaddr_inarp {
96 u_char sin_len;
97 u_char sin_family;
98 u_short sin_port;
99 struct in_addr sin_addr;
100 struct in_addr sin_srcaddr;
101 u_short sin_tos;
102 u_short sin_other;
103 #define SIN_PROXY 1
104 };
105 #endif /* !BURN_BRIDGES */
106
107 /*
108 * IP and ethernet specific routing flags
109 */
110 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
111 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
112
113 #ifdef _KERNEL
114 extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN];
115 extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN];
116
117 struct ifaddr;
118 struct llentry;
119
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 *);
130 #endif
131
132 #endif
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