if_ether.h revision 1.9 1 /*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * from: @(#)if_ether.h 8.1 (Berkeley) 6/10/93
34 * $Id: if_ether.h,v 1.9 1994/05/13 06:05:57 mycroft Exp $
35 */
36
37 /*
38 * Ethernet address - 6 octets
39 * this is only used by the ethers(3) functions.
40 */
41 struct ether_addr {
42 u_char ether_addr_octet[6];
43 };
44
45 /*
46 * Structure of a 10Mb/s Ethernet header.
47 */
48 struct ether_header {
49 u_char ether_dhost[6];
50 u_char ether_shost[6];
51 u_short ether_type;
52 };
53
54 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */
55 #define ETHERTYPE_IP 0x0800 /* IP protocol */
56 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */
57 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */
58
59 /*
60 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
61 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
62 * by an ETHER type (as given above) and then the (variable-length) header.
63 */
64 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
65 #define ETHERTYPE_NTRAILER 16
66
67 #define ETHERMTU 1500
68 #define ETHERMIN (60-14)
69
70 #ifdef KERNEL
71 /*
72 * Macro to map an IP multicast address to an Ethernet multicast address.
73 * The high-order 25 bits of the Ethernet address are statically assigned,
74 * and the low-order 23 bits are taken from the low end of the IP address.
75 */
76 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
77 /* struct in_addr *ipaddr; */ \
78 /* u_char enaddr[6]; */ \
79 { \
80 (enaddr)[0] = 0x01; \
81 (enaddr)[1] = 0x00; \
82 (enaddr)[2] = 0x5e; \
83 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
84 (enaddr)[4] = ((u_char *)ipaddr)[2]; \
85 (enaddr)[5] = ((u_char *)ipaddr)[3]; \
86 }
87 #endif
88
89 /*
90 * Ethernet Address Resolution Protocol.
91 *
92 * See RFC 826 for protocol description. Structure below is adapted
93 * to resolving internet addresses. Field names used correspond to
94 * RFC 826.
95 */
96 struct ether_arp {
97 struct arphdr ea_hdr; /* fixed-size header */
98 u_char arp_sha[6]; /* sender hardware address */
99 u_char arp_spa[4]; /* sender protocol address */
100 u_char arp_tha[6]; /* target hardware address */
101 u_char arp_tpa[4]; /* target protocol address */
102 };
103 #define arp_hrd ea_hdr.ar_hrd
104 #define arp_pro ea_hdr.ar_pro
105 #define arp_hln ea_hdr.ar_hln
106 #define arp_pln ea_hdr.ar_pln
107 #define arp_op ea_hdr.ar_op
108
109 /*
110 * Structure shared between the ethernet driver modules and
111 * the address resolution code. For example, each ec_softc or il_softc
112 * begins with this structure.
113 */
114 struct arpcom {
115 struct ifnet ac_if; /* network-visible interface */
116 u_char ac_enaddr[6]; /* ethernet hardware address */
117 struct in_addr ac_ipaddr; /* copy of ip address- XXX */
118 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */
119 int ac_multicnt; /* length of ac_multiaddrs list */
120 };
121
122 struct llinfo_arp {
123 struct llinfo_arp *la_next;
124 struct llinfo_arp *la_prev;
125 struct rtentry *la_rt;
126 struct mbuf *la_hold; /* last packet until resolved/timeout */
127 long la_asked; /* last time we QUERIED for this addr */
128 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */
129 };
130
131 struct sockaddr_inarp {
132 u_char sin_len;
133 u_char sin_family;
134 u_short sin_port;
135 struct in_addr sin_addr;
136 struct in_addr sin_srcaddr;
137 u_short sin_tos;
138 u_short sin_other;
139 #define SIN_PROXY 1
140 };
141
142 /*
143 * IP and ethernet specific routing flags
144 */
145 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
146 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
147
148 #ifdef KERNEL
149 u_char etherbroadcastaddr[6];
150 u_char ether_ipmulticast_min[6];
151 u_char ether_ipmulticast_max[6];
152 struct ifqueue arpintrq;
153
154 struct llinfo_arp *arptnew __P((struct in_addr *));
155 struct llinfo_arp llinfo_arp; /* head of the llinfo queue */
156
157 void arpwhohas __P((struct arpcom *, struct in_addr *));
158 void arpintr __P((void));
159 int arpresolve __P((struct arpcom *,
160 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *));
161 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *));
162 void arpwhohas __P((struct arpcom *, struct in_addr *));
163
164 int ether_addmulti __P((struct ifreq *, struct arpcom *));
165 int ether_delmulti __P((struct ifreq *, struct arpcom *));
166
167 /*
168 * Ethernet multicast address structure. There is one of these for each
169 * multicast address or range of multicast addresses that we are supposed
170 * to listen to on a particular interface. They are kept in a linked list,
171 * rooted in the interface's arpcom structure. (This really has nothing to
172 * do with ARP, or with the Internet address family, but this appears to be
173 * the minimally-disrupting place to put it.)
174 */
175 struct ether_multi {
176 u_char enm_addrlo[6]; /* low or only address of range */
177 u_char enm_addrhi[6]; /* high or only address of range */
178 struct arpcom *enm_ac; /* back pointer to arpcom */
179 u_int enm_refcount; /* no. claims to this addr/range */
180 struct ether_multi *enm_next; /* ptr to next ether_multi */
181 };
182
183 /*
184 * Structure used by macros below to remember position when stepping through
185 * all of the ether_multi records.
186 */
187 struct ether_multistep {
188 struct ether_multi *e_enm;
189 };
190
191 /*
192 * Macro for looking up the ether_multi record for a given range of Ethernet
193 * multicast addresses connected to a given arpcom structure. If no matching
194 * record is found, "enm" returns NULL.
195 */
196 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
197 /* u_char addrlo[6]; */ \
198 /* u_char addrhi[6]; */ \
199 /* struct arpcom *ac; */ \
200 /* struct ether_multi *enm; */ \
201 { \
202 for ((enm) = (ac)->ac_multiaddrs; \
203 (enm) != NULL && \
204 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \
205 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \
206 (enm) = (enm)->enm_next); \
207 }
208
209 /*
210 * Macro to step through all of the ether_multi records, one at a time.
211 * The current position is remembered in "step", which the caller must
212 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
213 * and get the first record. Both macros return a NULL "enm" when there
214 * are no remaining records.
215 */
216 #define ETHER_NEXT_MULTI(step, enm) \
217 /* struct ether_multistep step; */ \
218 /* struct ether_multi *enm; */ \
219 { \
220 if (((enm) = (step).e_enm) != NULL) \
221 (step).e_enm = (enm)->enm_next; \
222 }
223
224 #define ETHER_FIRST_MULTI(step, ac, enm) \
225 /* struct ether_multistep step; */ \
226 /* struct arpcom *ac; */ \
227 /* struct ether_multi *enm; */ \
228 { \
229 (step).e_enm = (ac)->ac_multiaddrs; \
230 ETHER_NEXT_MULTI((step), (enm)); \
231 }
232 #endif
233