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/*!\file inc/netinet/if_ether.h |
* Ethernet definitions. |
*/ |
|
/* Modified for emx by hv 1994 |
* |
* Copyright (c) 1982, 1986 Regents of the University of California. |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* 1. Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* 2. Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* 3. All advertising materials mentioning features or use of this software |
* must display the following acknowledgement: |
* This product includes software developed by the University of |
* California, Berkeley and its contributors. |
* 4. Neither the name of the University nor the names of its contributors |
* may be used to endorse or promote products derived from this software |
* without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* SUCH DAMAGE. |
* |
* from: @(#)if_ether.h 7.5 (Berkeley) 6/28/90 |
* $Id: if_ether.h,v 1.8 1994/02/02 05:58:54 hpeyerl Exp $ |
*/ |
|
#ifndef __NETINET_IF_ETHER_H |
#define __NETINET_IF_ETHER_H |
|
#include <sys/packon.h> |
|
/* |
* Ethernet address - 6 octets |
* this is only used by the ethers(3) functions. |
*/ |
struct ether_addr { |
u_char ether_addr_octet[6]; |
}; |
|
/* |
* Structure of a 10Mb/s Ethernet header. |
*/ |
struct ether_header { |
u_char ether_dhost[6]; |
u_char ether_shost[6]; |
u_short ether_type; |
}; |
|
#define ETHERTYPE_PUP 0x0200 /* PUP protocol */ |
/* the IBM header corrects the following to 0x608 for OS/2 but I believe |
* this is just a dirty hack |
*/ |
#define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ |
#define ETHERTYPE_IP 0x0800 /* IP protocol */ |
#define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ |
|
/* |
* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have |
* (type-ETHERTYPE_TRAIL)*512 bytes of data followed |
* by an ETHER type (as given above) and then the (variable-length) header. |
*/ |
#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ |
#define ETHERTYPE_NTRAILER 16 |
|
#define ETHERMTU 1500 |
#define ETHERMIN (60-14) |
|
/* |
* Macro to map an IP multicast address to an Ethernet multicast address. |
* The high-order 25 bits of the Ethernet address are statically assigned, |
* and the low-order 23 bits are taken from the low end of the IP address. |
*/ |
#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ |
/* struct in_addr *ipaddr; */ \ |
/* u_char enaddr[6]; */ \ |
{ \ |
(enaddr)[0] = 0x01; \ |
(enaddr)[1] = 0x00; \ |
(enaddr)[2] = 0x5e; \ |
(enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ |
(enaddr)[4] = ((u_char *)ipaddr)[2]; \ |
(enaddr)[5] = ((u_char *)ipaddr)[3]; \ |
} |
|
|
/* |
* Ethernet Address Resolution Protocol. |
* |
* See RFC 826 for protocol description. Structure below is adapted |
* to resolving internet addresses. Field names used correspond to |
* RFC 826. |
*/ |
struct ether_arp { |
struct arphdr ea_hdr; /* fixed-size header */ |
u_char arp_sha[6]; /* sender hardware address */ |
u_char arp_spa[4]; /* sender protocol address */ |
u_char arp_tha[6]; /* target hardware address */ |
u_char arp_tpa[4]; /* target protocol address */ |
}; |
#define arp_hrd ea_hdr.ar_hrd |
#define arp_pro ea_hdr.ar_pro |
#define arp_hln ea_hdr.ar_hln |
#define arp_pln ea_hdr.ar_pln |
#define arp_op ea_hdr.ar_op |
|
|
/* |
* Structure shared between the ethernet driver modules and |
* the address resolution code. For example, each ec_softc or il_softc |
* begins with this structure. |
*/ |
struct arpcom { |
struct ifnet ac_if; /* network-visible interface */ |
u_char ac_enaddr[6]; /* ethernet hardware address */ |
struct in_addr ac_ipaddr; /* copy of ip address- XXX */ |
struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ |
int ac_multicnt; /* length of ac_multiaddrs list */ |
}; |
|
/* |
* Internet to ethernet address resolution table. |
*/ |
|
struct arptab { |
struct in_addr at_iaddr; /* internet address */ |
u_char at_enaddr[6]; /* ethernet address */ |
u_char at_timer; /* minutes since last reference */ |
u_char at_flags; /* flags */ |
struct mbuf *at_hold; /* last packet until resolved/timeout */ |
/* only os2 */ |
u_short at_rcf; |
u_short at_rseg[8]; |
u_long at_millisec; |
int at_interface; |
}; |
|
|
extern u_char etherbroadcastaddr[6]; |
extern u_char ether_ipmulticast_min[6]; |
extern u_char ether_ipmulticast_max[6]; |
|
/* |
* Ethernet multicast address structure. There is one of these for each |
* multicast address or range of multicast addresses that we are supposed |
* to listen to on a particular interface. They are kept in a linked list, |
* rooted in the interface's arpcom structure. (This really has nothing to |
* do with ARP, or with the Internet address family, but this appears to be |
* the minimally-disrupting place to put it.) |
*/ |
struct ether_multi { |
u_char enm_addrlo[6]; /* low or only address of range */ |
u_char enm_addrhi[6]; /* high or only address of range */ |
struct arpcom *enm_ac; /* back pointer to arpcom */ |
u_int enm_refcount; /* no. claims to this addr/range */ |
struct ether_multi *enm_next; /* ptr to next ether_multi */ |
}; |
|
/* |
* Structure used by macros below to remember position when stepping through |
* all of the ether_multi records. |
*/ |
struct ether_multistep { |
struct ether_multi *e_enm; |
}; |
|
#include <sys/packoff.h> |
|
/* |
* Macro for looking up the ether_multi record for a given range of Ethernet |
* multicast addresses connected to a given arpcom structure. If no matching |
* record is found, "enm" returns NULL. |
*/ |
#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ |
/* u_char addrlo[6]; */ \ |
/* u_char addrhi[6]; */ \ |
/* struct arpcom *ac; */ \ |
/* struct ether_multi *enm; */ \ |
{ \ |
for ((enm) = (ac)->ac_multiaddrs; \ |
(enm) != NULL && \ |
(bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ |
bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ |
(enm) = (enm)->enm_next); \ |
} |
|
/* |
* Macro to step through all of the ether_multi records, one at a time. |
* The current position is remembered in "step", which the caller must |
* provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" |
* and get the first record. Both macros return a NULL "enm" when there |
* are no remaining records. |
*/ |
#define ETHER_NEXT_MULTI(step, enm) \ |
/* struct ether_multistep step; */ \ |
/* struct ether_multi *enm; */ \ |
{ \ |
if (((enm) = (step).e_enm) != NULL) \ |
(step).e_enm = (enm)->enm_next; \ |
} |
|
#define ETHER_FIRST_MULTI(step, ac, enm) \ |
/* struct ether_multistep step; */ \ |
/* struct arpcom *ac; */ \ |
/* struct ether_multi *enm; */ \ |
{ \ |
(step).e_enm = (ac)->ac_multiaddrs; \ |
ETHER_NEXT_MULTI((step), (enm)); \ |
} |
|
#endif |