150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* 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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#ifndef lint
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/*static char sccsid[] = "from: @(#)if.c 5.6 (Berkeley) 6/1/90";*/
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static char rcsid[] = "$Id: if.c,v 1.4 1993/08/01 18:24:30 mycroft Exp $";
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#endif /* not lint */
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/*
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* Routing Table Management Daemon
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*/
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#include "defs.h"
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extern struct interface *ifnet;
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/*
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* Find the interface with address addr.
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*/
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struct interface *
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if_ifwithaddr(addr)
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struct sockaddr *addr;
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{
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register struct interface *ifp;
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#define same(a1, a2) \
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(bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if (ifp->int_flags & IFF_REMOTE)
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continue;
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if (ifp->int_addr.sa_family != addr->sa_family)
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continue;
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if (same(&ifp->int_addr, addr))
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break;
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if ((ifp->int_flags & IFF_BROADCAST) &&
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same(&ifp->int_broadaddr, addr))
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break;
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}
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return (ifp);
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}
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/*
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* Find the point-to-point interface with destination address addr.
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*/
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struct interface *
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if_ifwithdstaddr(addr)
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struct sockaddr *addr;
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{
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register struct interface *ifp;
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if ((ifp->int_flags & IFF_POINTOPOINT) == 0)
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continue;
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if (same(&ifp->int_dstaddr, addr))
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break;
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}
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return (ifp);
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}
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/*
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* Find the interface on the network
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* of the specified address.
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*/
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struct interface *
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if_ifwithnet(addr)
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register struct sockaddr *addr;
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{
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register struct interface *ifp;
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register int af = addr->sa_family;
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register int (*netmatch)();
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if (af >= af_max)
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return (0);
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netmatch = afswitch[af].af_netmatch;
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if (ifp->int_flags & IFF_REMOTE)
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continue;
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if (af != ifp->int_addr.sa_family)
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continue;
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if ((*netmatch)(addr, &ifp->int_addr))
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break;
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}
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return (ifp);
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}
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/*
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* Find an interface from which the specified address
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* should have come from. Used for figuring out which
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* interface a packet came in on -- for tracing.
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*/
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struct interface *
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if_iflookup(addr)
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struct sockaddr *addr;
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{
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register struct interface *ifp, *maybe;
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register int af = addr->sa_family;
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register int (*netmatch)();
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if (af >= af_max)
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return (0);
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maybe = 0;
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netmatch = afswitch[af].af_netmatch;
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if (ifp->int_addr.sa_family != af)
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continue;
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if (same(&ifp->int_addr, addr))
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break;
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if ((ifp->int_flags & IFF_BROADCAST) &&
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same(&ifp->int_broadaddr, addr))
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break;
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if ((ifp->int_flags & IFF_POINTOPOINT) &&
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same(&ifp->int_dstaddr, addr))
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break;
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if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr))
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maybe = ifp;
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}
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if (ifp == 0)
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ifp = maybe;
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return (ifp);
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}
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