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Annotation of 43BSDReno/sbin/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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)if.c       5.6 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: /*
        !            25:  * Routing Table Management Daemon
        !            26:  */
        !            27: #include "defs.h"
        !            28: 
        !            29: extern struct interface *ifnet;
        !            30: 
        !            31: /*
        !            32:  * Find the interface with address addr.
        !            33:  */
        !            34: struct interface *
        !            35: if_ifwithaddr(addr)
        !            36:        struct sockaddr *addr;
        !            37: {
        !            38:        register struct interface *ifp;
        !            39: 
        !            40: #define        same(a1, a2) \
        !            41:        (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
        !            42:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            43:                if (ifp->int_flags & IFF_REMOTE)
        !            44:                        continue;
        !            45:                if (ifp->int_addr.sa_family != addr->sa_family)
        !            46:                        continue;
        !            47:                if (same(&ifp->int_addr, addr))
        !            48:                        break;
        !            49:                if ((ifp->int_flags & IFF_BROADCAST) &&
        !            50:                    same(&ifp->int_broadaddr, addr))
        !            51:                        break;
        !            52:        }
        !            53:        return (ifp);
        !            54: }
        !            55: 
        !            56: /*
        !            57:  * Find the point-to-point interface with destination address addr.
        !            58:  */
        !            59: struct interface *
        !            60: if_ifwithdstaddr(addr)
        !            61:        struct sockaddr *addr;
        !            62: {
        !            63:        register struct interface *ifp;
        !            64: 
        !            65:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            66:                if ((ifp->int_flags & IFF_POINTOPOINT) == 0)
        !            67:                        continue;
        !            68:                if (same(&ifp->int_dstaddr, addr))
        !            69:                        break;
        !            70:        }
        !            71:        return (ifp);
        !            72: }
        !            73: 
        !            74: /*
        !            75:  * Find the interface on the network 
        !            76:  * of the specified address.
        !            77:  */
        !            78: struct interface *
        !            79: if_ifwithnet(addr)
        !            80:        register struct sockaddr *addr;
        !            81: {
        !            82:        register struct interface *ifp;
        !            83:        register int af = addr->sa_family;
        !            84:        register int (*netmatch)();
        !            85: 
        !            86:        if (af >= af_max)
        !            87:                return (0);
        !            88:        netmatch = afswitch[af].af_netmatch;
        !            89:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            90:                if (ifp->int_flags & IFF_REMOTE)
        !            91:                        continue;
        !            92:                if (af != ifp->int_addr.sa_family)
        !            93:                        continue;
        !            94:                if ((*netmatch)(addr, &ifp->int_addr))
        !            95:                        break;
        !            96:        }
        !            97:        return (ifp);
        !            98: }
        !            99: 
        !           100: /*
        !           101:  * Find an interface from which the specified address
        !           102:  * should have come from.  Used for figuring out which
        !           103:  * interface a packet came in on -- for tracing.
        !           104:  */
        !           105: struct interface *
        !           106: if_iflookup(addr)
        !           107:        struct sockaddr *addr;
        !           108: {
        !           109:        register struct interface *ifp, *maybe;
        !           110:        register int af = addr->sa_family;
        !           111:        register int (*netmatch)();
        !           112: 
        !           113:        if (af >= af_max)
        !           114:                return (0);
        !           115:        maybe = 0;
        !           116:        netmatch = afswitch[af].af_netmatch;
        !           117:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !           118:                if (ifp->int_addr.sa_family != af)
        !           119:                        continue;
        !           120:                if (same(&ifp->int_addr, addr))
        !           121:                        break;
        !           122:                if ((ifp->int_flags & IFF_BROADCAST) &&
        !           123:                    same(&ifp->int_broadaddr, addr))
        !           124:                        break;
        !           125:                if ((ifp->int_flags & IFF_POINTOPOINT) &&
        !           126:                    same(&ifp->int_dstaddr, addr))
        !           127:                        break;
        !           128:                if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr))
        !           129:                        maybe = ifp;
        !           130:        }
        !           131:        if (ifp == 0)
        !           132:                ifp = maybe;
        !           133:        return (ifp);
        !           134: }

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