f7d7038aa4
Avoid implicit function calls by adding the proper include files. Use const char copyright. Fix some fprint formatting. In the manual page: Use the .Pa macro for filenames and locations. Kill hard setence breaks. Make use of the .Tn and .Dq macros. Add some to text to the otherwise blank HISTORY section (taken from CVS).
152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 1995 John Hay. 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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* static char sccsid[] = "@(#)if.c 5.1 (Berkeley) 6/4/85"; (routed/if.c)
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)if.c 8.1 (Berkeley) 6/5/93";
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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), 10) == 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 (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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