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Annotation of 43BSDTahoe/etc/routed/if.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)if.c       5.4 (Berkeley) 2/16/88";
        !            15: #endif /* not lint */
        !            16: 
        !            17: /*
        !            18:  * Routing Table Management Daemon
        !            19:  */
        !            20: #include "defs.h"
        !            21: 
        !            22: extern struct interface *ifnet;
        !            23: 
        !            24: /*
        !            25:  * Find the interface with address addr.
        !            26:  */
        !            27: struct interface *
        !            28: if_ifwithaddr(addr)
        !            29:        struct sockaddr *addr;
        !            30: {
        !            31:        register struct interface *ifp;
        !            32: 
        !            33: #define        same(a1, a2) \
        !            34:        (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
        !            35:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            36:                if (ifp->int_flags & IFF_REMOTE)
        !            37:                        continue;
        !            38:                if (ifp->int_addr.sa_family != addr->sa_family)
        !            39:                        continue;
        !            40:                if (same(&ifp->int_addr, addr))
        !            41:                        break;
        !            42:                if ((ifp->int_flags & IFF_BROADCAST) &&
        !            43:                    same(&ifp->int_broadaddr, addr))
        !            44:                        break;
        !            45:        }
        !            46:        return (ifp);
        !            47: }
        !            48: 
        !            49: /*
        !            50:  * Find the point-to-point interface with destination address addr.
        !            51:  */
        !            52: struct interface *
        !            53: if_ifwithdstaddr(addr)
        !            54:        struct sockaddr *addr;
        !            55: {
        !            56:        register struct interface *ifp;
        !            57: 
        !            58:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            59:                if ((ifp->int_flags & IFF_POINTOPOINT) == 0)
        !            60:                        continue;
        !            61:                if (same(&ifp->int_dstaddr, addr))
        !            62:                        break;
        !            63:        }
        !            64:        return (ifp);
        !            65: }
        !            66: 
        !            67: /*
        !            68:  * Find the interface on the network 
        !            69:  * of the specified address.
        !            70:  */
        !            71: struct interface *
        !            72: if_ifwithnet(addr)
        !            73:        register struct sockaddr *addr;
        !            74: {
        !            75:        register struct interface *ifp;
        !            76:        register int af = addr->sa_family;
        !            77:        register int (*netmatch)();
        !            78: 
        !            79:        if (af >= af_max)
        !            80:                return (0);
        !            81:        netmatch = afswitch[af].af_netmatch;
        !            82:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            83:                if (ifp->int_flags & IFF_REMOTE)
        !            84:                        continue;
        !            85:                if (af != ifp->int_addr.sa_family)
        !            86:                        continue;
        !            87:                if ((*netmatch)(addr, &ifp->int_addr))
        !            88:                        break;
        !            89:        }
        !            90:        return (ifp);
        !            91: }
        !            92: 
        !            93: /*
        !            94:  * Find an interface from which the specified address
        !            95:  * should have come from.  Used for figuring out which
        !            96:  * interface a packet came in on -- for tracing.
        !            97:  */
        !            98: struct interface *
        !            99: if_iflookup(addr)
        !           100:        struct sockaddr *addr;
        !           101: {
        !           102:        register struct interface *ifp, *maybe;
        !           103:        register int af = addr->sa_family;
        !           104:        register int (*netmatch)();
        !           105: 
        !           106:        if (af >= af_max)
        !           107:                return (0);
        !           108:        maybe = 0;
        !           109:        netmatch = afswitch[af].af_netmatch;
        !           110:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !           111:                if (ifp->int_addr.sa_family != af)
        !           112:                        continue;
        !           113:                if (same(&ifp->int_addr, addr))
        !           114:                        break;
        !           115:                if ((ifp->int_flags & IFF_BROADCAST) &&
        !           116:                    same(&ifp->int_broadaddr, addr))
        !           117:                        break;
        !           118:                if ((ifp->int_flags & IFF_POINTOPOINT) &&
        !           119:                    same(&ifp->int_dstaddr, addr))
        !           120:                        break;
        !           121:                if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr))
        !           122:                        maybe = ifp;
        !           123:        }
        !           124:        if (ifp == 0)
        !           125:                ifp = maybe;
        !           126:        return (ifp);
        !           127: }

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