diff options
Diffstat (limited to 'usr.sbin/routed/if.c')
| -rw-r--r-- | usr.sbin/routed/if.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/usr.sbin/routed/if.c b/usr.sbin/routed/if.c new file mode 100644 index 000000000000..4871c9df32aa --- /dev/null +++ b/usr.sbin/routed/if.c @@ -0,0 +1,148 @@ +/* + * Copyright (c) 1983 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. + */ + +#ifndef lint +static char sccsid[] = "@(#)if.c 5.6 (Berkeley) 6/1/90"; +#endif /* not lint */ + +/* + * Routing Table Management Daemon + */ +#include "defs.h" + +extern struct interface *ifnet; + +/* + * Find the interface with address addr. + */ +struct interface * +if_ifwithaddr(addr) + struct sockaddr *addr; +{ + register struct interface *ifp; + +#define same(a1, a2) \ + (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) + for (ifp = ifnet; ifp; ifp = ifp->int_next) { + if (ifp->int_flags & IFF_REMOTE) + continue; + if (ifp->int_addr.sa_family != addr->sa_family) + continue; + if (same(&ifp->int_addr, addr)) + break; + if ((ifp->int_flags & IFF_BROADCAST) && + same(&ifp->int_broadaddr, addr)) + break; + } + return (ifp); +} + +/* + * Find the point-to-point interface with destination address addr. + */ +struct interface * +if_ifwithdstaddr(addr) + struct sockaddr *addr; +{ + register struct interface *ifp; + + for (ifp = ifnet; ifp; ifp = ifp->int_next) { + if ((ifp->int_flags & IFF_POINTOPOINT) == 0) + continue; + if (same(&ifp->int_dstaddr, addr)) + break; + } + return (ifp); +} + +/* + * Find the interface on the network + * of the specified address. + */ +struct interface * +if_ifwithnet(addr) + register struct sockaddr *addr; +{ + register struct interface *ifp; + register int af = addr->sa_family; + register int (*netmatch)(); + + if (af >= af_max) + return (0); + netmatch = afswitch[af].af_netmatch; + for (ifp = ifnet; ifp; ifp = ifp->int_next) { + if (ifp->int_flags & IFF_REMOTE) + continue; + if (af != ifp->int_addr.sa_family) + continue; + if ((*netmatch)(addr, &ifp->int_addr)) + break; + } + return (ifp); +} + +/* + * Find an interface from which the specified address + * should have come from. Used for figuring out which + * interface a packet came in on -- for tracing. + */ +struct interface * +if_iflookup(addr) + struct sockaddr *addr; +{ + register struct interface *ifp, *maybe; + register int af = addr->sa_family; + register int (*netmatch)(); + + if (af >= af_max) + return (0); + maybe = 0; + netmatch = afswitch[af].af_netmatch; + for (ifp = ifnet; ifp; ifp = ifp->int_next) { + if (ifp->int_addr.sa_family != af) + continue; + if (same(&ifp->int_addr, addr)) + break; + if ((ifp->int_flags & IFF_BROADCAST) && + same(&ifp->int_broadaddr, addr)) + break; + if ((ifp->int_flags & IFF_POINTOPOINT) && + same(&ifp->int_dstaddr, addr)) + break; + if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) + maybe = ifp; + } + if (ifp == 0) + ifp = maybe; + return (ifp); +} |