if_ether.h

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/*
 * Copyright (c) 1982, 1986, 1993
 *      The 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.
 * 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.
 *
 *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
 * $FreeBSD: src/sys/netinet/if_ether.h,v 1.32 2005/02/22 13:04:03 glebius Exp $
 */


#ifndef _NETINET_IF_ETHER_H_
#define _NETINET_IF_ETHER_H_

#include <netinet/in.h> /* struct in_addr */
#include <net/ethernet.h>
#include <net/if_arp.h>

#ifdef _KERNEL
/*
 * 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[ETHER_ADDR_LEN];          */ \
{ \
        (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]; \
}
#endif

/*
 * 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[ETHER_ADDR_LEN];        /* sender hardware address */
        u_char  arp_spa[4];     /* sender protocol address */
        u_char  arp_tha[ETHER_ADDR_LEN];        /* 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

struct sockaddr_inarp {
        u_char  sin_len;
        u_char  sin_family;
        u_short sin_port;
        struct  in_addr sin_addr;
        struct  in_addr sin_srcaddr;
        u_short sin_tos;
        u_short sin_other;
#define SIN_PROXY 1
};
/*
 * IP and ethernet specific routing flags
 */
#define RTF_USETRAILERS RTF_PROTO1      /* use trailers */
#define RTF_ANNOUNCE    RTF_PROTO2      /* announce new arp entry */

#ifdef  _KERNEL
extern u_char   etherbroadcastaddr[ETHER_ADDR_LEN];
extern u_char   ether_ipmulticast_min[ETHER_ADDR_LEN];
extern u_char   ether_ipmulticast_max[ETHER_ADDR_LEN];
extern struct   ifqueue arpintrq;

int     arpresolve(struct arpcom *, struct rtentry *, struct mbuf *,
                        struct sockaddr *, u_char *, struct rtentry *);
void    arp_ifinit(struct arpcom *, struct ifaddr *);
int     ether_addmulti(struct ifreq *, struct arpcom *);
int     ether_delmulti(struct ifreq *, struct arpcom *);

/*
 * 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[ETHER_ADDR_LEN];             /* low  or only address of range */
        u_char  enm_addrhi[ETHER_ADDR_LEN];             /* 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;
};

/*
 * 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[ETHER_ADDR_LEN]; */ \
        /* u_char addrhi[ETHER_ADDR_LEN]; */ \
        /* struct arpcom *ac; */ \
        /* struct ether_multi *enm; */ \
{ \
        for ((enm) = (ac)->ac_multiaddrs; \
            (enm) != NULL && \
            (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
             bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 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

#endif