885f1aa42b
Add five sysctl variables that you should probably never tweak. net.arp.t_prune: 300 net.arp.t_keep: 1200 net.arp.t_down: 20 net.arp.maxtries: 5 net.arp.useloopback: 1 net.arp.proxyall: 0 (It's net.arp because arp isn't limited to inet, though our present implementation surely is).
225 lines
7.5 KiB
C
225 lines
7.5 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_ether.h 8.3 (Berkeley) 5/2/95
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* $Id: if_ether.h,v 1.12 1995/12/05 02:01:42 davidg Exp $
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*/
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#ifndef _NETINET_IF_ETHER_H_
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#define _NETINET_IF_ETHER_H_
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/*
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* Structure of a 10Mb/s Ethernet header.
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*/
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struct ether_header {
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u_char ether_dhost[6];
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u_char ether_shost[6];
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u_short ether_type;
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};
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/*
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* Structure of a 48-bit Ethernet address.
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*/
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struct ether_addr {
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u_char octet[6];
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};
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#define ETHERTYPE_PUP 0x0200 /* PUP protocol */
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#define ETHERTYPE_IP 0x0800 /* IP protocol */
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#define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */
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#define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */
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/*
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* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
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* (type-ETHERTYPE_TRAIL)*512 bytes of data followed
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* by an ETHER type (as given above) and then the (variable-length) header.
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*/
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#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
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#define ETHERTYPE_NTRAILER 16
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#define ETHERMTU 1500
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#define ETHERMIN (60-14)
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#ifdef KERNEL
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/*
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* Macro to map an IP multicast address to an Ethernet multicast address.
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* The high-order 25 bits of the Ethernet address are statically assigned,
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* and the low-order 23 bits are taken from the low end of the IP address.
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*/
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#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
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/* struct in_addr *ipaddr; */ \
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/* u_char enaddr[6]; */ \
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{ \
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(enaddr)[0] = 0x01; \
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(enaddr)[1] = 0x00; \
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(enaddr)[2] = 0x5e; \
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(enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
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(enaddr)[4] = ((u_char *)ipaddr)[2]; \
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(enaddr)[5] = ((u_char *)ipaddr)[3]; \
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}
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#endif
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/*
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* Ethernet Address Resolution Protocol.
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*
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* See RFC 826 for protocol description. Structure below is adapted
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* to resolving internet addresses. Field names used correspond to
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* RFC 826.
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*/
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struct ether_arp {
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struct arphdr ea_hdr; /* fixed-size header */
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u_char arp_sha[6]; /* sender hardware address */
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u_char arp_spa[4]; /* sender protocol address */
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u_char arp_tha[6]; /* target hardware address */
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u_char arp_tpa[4]; /* target protocol address */
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};
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#define arp_hrd ea_hdr.ar_hrd
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#define arp_pro ea_hdr.ar_pro
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#define arp_hln ea_hdr.ar_hln
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#define arp_pln ea_hdr.ar_pln
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#define arp_op ea_hdr.ar_op
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/*
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* Structure shared between the ethernet driver modules and
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* the address resolution code. For example, each ec_softc or il_softc
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* begins with this structure.
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*/
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struct arpcom {
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/*
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* The ifnet struct _must_ be at the head of this structure.
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*/
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struct ifnet ac_if; /* network-visible interface */
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u_char ac_enaddr[6]; /* ethernet hardware address */
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struct in_addr ac_ipaddr; /* copy of ip address- XXX */
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struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */
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int ac_multicnt; /* length of ac_multiaddrs list */
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};
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struct sockaddr_inarp {
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u_char sin_len;
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u_char sin_family;
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u_short sin_port;
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struct in_addr sin_addr;
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struct in_addr sin_srcaddr;
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u_short sin_tos;
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u_short sin_other;
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#define SIN_PROXY 1
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};
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/*
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* IP and ethernet specific routing flags
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*/
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#define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
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#define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
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#ifdef KERNEL
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extern u_char etherbroadcastaddr[6];
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extern u_char ether_ipmulticast_min[6];
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extern u_char ether_ipmulticast_max[6];
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extern struct ifqueue arpintrq;
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int arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *,
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struct sockaddr *, u_char *, struct rtentry *));
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void arp_ifinit __P((struct arpcom *, struct ifaddr *));
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int ether_addmulti __P((struct ifreq *, struct arpcom *));
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int ether_delmulti __P((struct ifreq *, struct arpcom *));
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/*
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* Ethernet multicast address structure. There is one of these for each
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* multicast address or range of multicast addresses that we are supposed
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* to listen to on a particular interface. They are kept in a linked list,
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* rooted in the interface's arpcom structure. (This really has nothing to
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* do with ARP, or with the Internet address family, but this appears to be
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* the minimally-disrupting place to put it.)
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*/
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struct ether_multi {
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u_char enm_addrlo[6]; /* low or only address of range */
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u_char enm_addrhi[6]; /* high or only address of range */
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struct arpcom *enm_ac; /* back pointer to arpcom */
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u_int enm_refcount; /* no. claims to this addr/range */
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struct ether_multi *enm_next; /* ptr to next ether_multi */
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};
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/*
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* Structure used by macros below to remember position when stepping through
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* all of the ether_multi records.
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*/
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struct ether_multistep {
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struct ether_multi *e_enm;
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};
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/*
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* Macro for looking up the ether_multi record for a given range of Ethernet
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* multicast addresses connected to a given arpcom structure. If no matching
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* record is found, "enm" returns NULL.
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*/
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#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
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/* u_char addrlo[6]; */ \
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/* u_char addrhi[6]; */ \
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/* struct arpcom *ac; */ \
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/* struct ether_multi *enm; */ \
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{ \
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for ((enm) = (ac)->ac_multiaddrs; \
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(enm) != NULL && \
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(bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \
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bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \
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(enm) = (enm)->enm_next); \
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}
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/*
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* Macro to step through all of the ether_multi records, one at a time.
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* The current position is remembered in "step", which the caller must
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* provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
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* and get the first record. Both macros return a NULL "enm" when there
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* are no remaining records.
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*/
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#define ETHER_NEXT_MULTI(step, enm) \
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/* struct ether_multistep step; */ \
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/* struct ether_multi *enm; */ \
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{ \
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if (((enm) = (step).e_enm) != NULL) \
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(step).e_enm = (enm)->enm_next; \
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}
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#define ETHER_FIRST_MULTI(step, ac, enm) \
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/* struct ether_multistep step; */ \
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/* struct arpcom *ac; */ \
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/* struct ether_multi *enm; */ \
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{ \
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(step).e_enm = (ac)->ac_multiaddrs; \
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ETHER_NEXT_MULTI((step), (enm)); \
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}
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#endif
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#endif
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