source: rtems/cpukit/libnetworking/netinet/if_ether.h @ a3dfa39

4.104.114.84.95
Last change on this file since a3dfa39 was 39e6e65a, checked in by Joel Sherrill <joel.sherrill@…>, on 08/19/98 at 21:32:28

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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 *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
34 *      $Id$
35 */
36
37#ifndef _NETINET_IF_ETHER_H_
38#define _NETINET_IF_ETHER_H_
39
40#include <net/ethernet.h>
41
42#define ETHERTYPE_PUP           0x0200  /* PUP protocol */
43#define ETHERTYPE_IP            0x0800  /* IP protocol */
44#define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
45#define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
46
47/*
48 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
49 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
50 * by an ETHER type (as given above) and then the (variable-length) header.
51 */
52#define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
53#define ETHERTYPE_NTRAILER      16
54
55#define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
56#define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
57
58#ifdef KERNEL
59/*
60 * Macro to map an IP multicast address to an Ethernet multicast address.
61 * The high-order 25 bits of the Ethernet address are statically assigned,
62 * and the low-order 23 bits are taken from the low end of the IP address.
63 */
64#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
65        /* struct in_addr *ipaddr; */ \
66        /* u_char enaddr[ETHER_ADDR_LEN];          */ \
67{ \
68        (enaddr)[0] = 0x01; \
69        (enaddr)[1] = 0x00; \
70        (enaddr)[2] = 0x5e; \
71        (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
72        (enaddr)[4] = ((u_char *)ipaddr)[2]; \
73        (enaddr)[5] = ((u_char *)ipaddr)[3]; \
74}
75#endif
76
77/*
78 * Ethernet Address Resolution Protocol.
79 *
80 * See RFC 826 for protocol description.  Structure below is adapted
81 * to resolving internet addresses.  Field names used correspond to
82 * RFC 826.
83 */
84struct  ether_arp {
85        struct  arphdr ea_hdr;  /* fixed-size header */
86        u_char  arp_sha[ETHER_ADDR_LEN];        /* sender hardware address */
87        u_char  arp_spa[4];     /* sender protocol address */
88        u_char  arp_tha[ETHER_ADDR_LEN];        /* target hardware address */
89        u_char  arp_tpa[4];     /* target protocol address */
90};
91#define arp_hrd ea_hdr.ar_hrd
92#define arp_pro ea_hdr.ar_pro
93#define arp_hln ea_hdr.ar_hln
94#define arp_pln ea_hdr.ar_pln
95#define arp_op  ea_hdr.ar_op
96
97
98/*
99 * Structure shared between the ethernet driver modules and
100 * the address resolution code.  For example, each ec_softc or il_softc
101 * begins with this structure.
102 */
103struct  arpcom {
104        /*
105         * The ifnet struct _must_ be at the head of this structure.
106         */
107        struct  ifnet ac_if;            /* network-visible interface */
108        u_char  ac_enaddr[ETHER_ADDR_LEN];              /* ethernet hardware address */
109        struct  ether_multi *ac_multiaddrs; /* list of ether multicast addrs */
110        int     ac_multicnt;            /* length of ac_multiaddrs list */
111};
112
113struct sockaddr_inarp {
114        u_char  sin_len;
115        u_char  sin_family;
116        u_short sin_port;
117        struct  in_addr sin_addr;
118        struct  in_addr sin_srcaddr;
119        u_short sin_tos;
120        u_short sin_other;
121#define SIN_PROXY 1
122};
123/*
124 * IP and ethernet specific routing flags
125 */
126#define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
127#define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */
128
129#ifdef  KERNEL
130extern u_char   etherbroadcastaddr[ETHER_ADDR_LEN];
131extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
132extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
133extern struct   ifqueue arpintrq;
134
135int     arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *,
136                        struct sockaddr *, u_char *, struct rtentry *));
137void    arp_ifinit __P((struct arpcom *, struct ifaddr *));
138int     ether_addmulti __P((struct ifreq *, struct arpcom *));
139int     ether_delmulti __P((struct ifreq *, struct arpcom *));
140
141/*
142 * Ethernet multicast address structure.  There is one of these for each
143 * multicast address or range of multicast addresses that we are supposed
144 * to listen to on a particular interface.  They are kept in a linked list,
145 * rooted in the interface's arpcom structure.  (This really has nothing to
146 * do with ARP, or with the Internet address family, but this appears to be
147 * the minimally-disrupting place to put it.)
148 */
149struct ether_multi {
150        u_char  enm_addrlo[ETHER_ADDR_LEN];             /* low  or only address of range */
151        u_char  enm_addrhi[ETHER_ADDR_LEN];             /* high or only address of range */
152        struct  arpcom *enm_ac;         /* back pointer to arpcom */
153        u_int   enm_refcount;           /* no. claims to this addr/range */
154        struct  ether_multi *enm_next;  /* ptr to next ether_multi */
155};
156
157/*
158 * Structure used by macros below to remember position when stepping through
159 * all of the ether_multi records.
160 */
161struct ether_multistep {
162        struct ether_multi  *e_enm;
163};
164
165/*
166 * Macro for looking up the ether_multi record for a given range of Ethernet
167 * multicast addresses connected to a given arpcom structure.  If no matching
168 * record is found, "enm" returns NULL.
169 */
170#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
171        /* u_char addrlo[ETHER_ADDR_LEN]; */ \
172        /* u_char addrhi[ETHER_ADDR_LEN]; */ \
173        /* struct arpcom *ac; */ \
174        /* struct ether_multi *enm; */ \
175{ \
176        for ((enm) = (ac)->ac_multiaddrs; \
177            (enm) != NULL && \
178            (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
179             bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
180                (enm) = (enm)->enm_next); \
181}
182
183/*
184 * Macro to step through all of the ether_multi records, one at a time.
185 * The current position is remembered in "step", which the caller must
186 * provide.  ETHER_FIRST_MULTI(), below, must be called to initialize "step"
187 * and get the first record.  Both macros return a NULL "enm" when there
188 * are no remaining records.
189 */
190#define ETHER_NEXT_MULTI(step, enm) \
191        /* struct ether_multistep step; */  \
192        /* struct ether_multi *enm; */  \
193{ \
194        if (((enm) = (step).e_enm) != NULL) \
195                (step).e_enm = (enm)->enm_next; \
196}
197
198#define ETHER_FIRST_MULTI(step, ac, enm) \
199        /* struct ether_multistep step; */ \
200        /* struct arpcom *ac; */ \
201        /* struct ether_multi *enm; */ \
202{ \
203        (step).e_enm = (ac)->ac_multiaddrs; \
204        ETHER_NEXT_MULTI((step), (enm)); \
205}
206
207#endif
208
209#endif
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