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Annotation of 43BSDReno/sbin/XNSrouted/tables.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 The 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[] = "@(#)tables.c   5.9 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: /*
        !            25:  * Routing Table Management Daemon
        !            26:  */
        !            27: #include "defs.h"
        !            28: #include <sys/ioctl.h>
        !            29: #include <errno.h>
        !            30: 
        !            31: #ifndef DEBUG
        !            32: #define        DEBUG   0
        !            33: #endif
        !            34: 
        !            35: extern char *xns_ntoa();
        !            36: #define FIXLEN(s) { if ((s)->sa_len == 0) (s)->sa_len = sizeof (*(s));}
        !            37: 
        !            38: int    install = !DEBUG;               /* if 1 call kernel */
        !            39: int    delete = 1;
        !            40: /*
        !            41:  * Lookup dst in the tables for an exact match.
        !            42:  */
        !            43: struct rt_entry *
        !            44: rtlookup(dst)
        !            45:        struct sockaddr *dst;
        !            46: {
        !            47:        register struct rt_entry *rt;
        !            48:        register struct rthash *rh;
        !            49:        register u_int hash;
        !            50:        struct afhash h;
        !            51:        int doinghost = 1;
        !            52: 
        !            53:        if (dst->sa_family >= AF_MAX)
        !            54:                return (0);
        !            55:        (*afswitch[dst->sa_family].af_hash)(dst, &h);
        !            56:        hash = h.afh_hosthash;
        !            57:        rh = &hosthash[hash & ROUTEHASHMASK];
        !            58: again:
        !            59:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            60:                if (rt->rt_hash != hash)
        !            61:                        continue;
        !            62:                if (equal(&rt->rt_dst, dst))
        !            63:                        return (rt);
        !            64:        }
        !            65:        if (doinghost) {
        !            66:                doinghost = 0;
        !            67:                hash = h.afh_nethash;
        !            68:                rh = &nethash[hash & ROUTEHASHMASK];
        !            69:                goto again;
        !            70:        }
        !            71:        return (0);
        !            72: }
        !            73: 
        !            74: /*
        !            75:  * Find a route to dst as the kernel would.
        !            76:  */
        !            77: struct rt_entry *
        !            78: rtfind(dst)
        !            79:        struct sockaddr *dst;
        !            80: {
        !            81:        register struct rt_entry *rt;
        !            82:        register struct rthash *rh;
        !            83:        register u_int hash;
        !            84:        struct afhash h;
        !            85:        int af = dst->sa_family;
        !            86:        int doinghost = 1, (*match)();
        !            87: 
        !            88:        if (af >= AF_MAX)
        !            89:                return (0);
        !            90:        (*afswitch[af].af_hash)(dst, &h);
        !            91:        hash = h.afh_hosthash;
        !            92:        rh = &hosthash[hash & ROUTEHASHMASK];
        !            93: 
        !            94: again:
        !            95:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            96:                if (rt->rt_hash != hash)
        !            97:                        continue;
        !            98:                if (doinghost) {
        !            99:                        if (equal(&rt->rt_dst, dst))
        !           100:                                return (rt);
        !           101:                } else {
        !           102:                        if (rt->rt_dst.sa_family == af &&
        !           103:                            (*match)(&rt->rt_dst, dst))
        !           104:                                return (rt);
        !           105:                }
        !           106:        }
        !           107:        if (doinghost) {
        !           108:                doinghost = 0;
        !           109:                hash = h.afh_nethash;
        !           110:                rh = &nethash[hash & ROUTEHASHMASK];
        !           111:                match = afswitch[af].af_netmatch;
        !           112:                goto again;
        !           113:        }
        !           114:        return (0);
        !           115: }
        !           116: 
        !           117: rtadd(dst, gate, metric, state)
        !           118:        struct sockaddr *dst, *gate;
        !           119:        int metric, state;
        !           120: {
        !           121:        struct afhash h;
        !           122:        register struct rt_entry *rt;
        !           123:        struct rthash *rh;
        !           124:        int af = dst->sa_family, flags;
        !           125:        u_int hash;
        !           126: 
        !           127:        FIXLEN(dst);
        !           128:        FIXLEN(gate);
        !           129:        if (af >= AF_MAX)
        !           130:                return;
        !           131:        (*afswitch[af].af_hash)(dst, &h);
        !           132:        flags = (*afswitch[af].af_ishost)(dst) ? RTF_HOST : 0;
        !           133:        if (flags & RTF_HOST) {
        !           134:                hash = h.afh_hosthash;
        !           135:                rh = &hosthash[hash & ROUTEHASHMASK];
        !           136:        } else {
        !           137:                hash = h.afh_nethash;
        !           138:                rh = &nethash[hash & ROUTEHASHMASK];
        !           139:        }
        !           140:        rt = (struct rt_entry *)malloc(sizeof (*rt));
        !           141:        if (rt == 0)
        !           142:                return;
        !           143:        rt->rt_hash = hash;
        !           144:        rt->rt_dst = *dst;
        !           145:        rt->rt_router = *gate;
        !           146:        rt->rt_metric = metric;
        !           147:        rt->rt_timer = 0;
        !           148:        rt->rt_flags = RTF_UP | flags;
        !           149:        rt->rt_state = state | RTS_CHANGED;
        !           150:        rt->rt_ifp = if_ifwithnet(&rt->rt_router);
        !           151:        if (metric)
        !           152:                rt->rt_flags |= RTF_GATEWAY;
        !           153:        insque(rt, rh);
        !           154:        TRACE_ACTION(ADD, rt);
        !           155:        /*
        !           156:         * If the ioctl fails because the gateway is unreachable
        !           157:         * from this host, discard the entry.  This should only
        !           158:         * occur because of an incorrect entry in /etc/gateways.
        !           159:         */
        !           160:        if (install && ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
        !           161:                if (errno != EEXIST)
        !           162:                        perror("SIOCADDRT");
        !           163:                if (errno == ENETUNREACH) {
        !           164:                        TRACE_ACTION(DELETE, rt);
        !           165:                        remque(rt);
        !           166:                        free((char *)rt);
        !           167:                }
        !           168:        }
        !           169: }
        !           170: 
        !           171: rtchange(rt, gate, metric)
        !           172:        struct rt_entry *rt;
        !           173:        struct sockaddr *gate;
        !           174:        short metric;
        !           175: {
        !           176:        int doioctl = 0, metricchanged = 0;
        !           177:        struct rtentry oldroute;
        !           178: 
        !           179:        FIXLEN(gate);
        !           180:        if (!equal(&rt->rt_router, gate))
        !           181:                doioctl++;
        !           182:        if (metric != rt->rt_metric)
        !           183:                metricchanged++;
        !           184:        if (doioctl || metricchanged) {
        !           185:                TRACE_ACTION(CHANGE FROM, rt);
        !           186:                if (doioctl) {
        !           187:                        oldroute = rt->rt_rt;
        !           188:                        rt->rt_router = *gate;
        !           189:                }
        !           190:                rt->rt_metric = metric;
        !           191:                if ((rt->rt_state & RTS_INTERFACE) && metric) {
        !           192:                        rt->rt_state &= ~RTS_INTERFACE;
        !           193:                        syslog(LOG_ERR,
        !           194:                                "changing route from interface %s (timed out)",
        !           195:                                rt->rt_ifp->int_name);
        !           196:                }
        !           197:                if (metric)
        !           198:                        rt->rt_flags |= RTF_GATEWAY;
        !           199:                else
        !           200:                        rt->rt_flags &= ~RTF_GATEWAY;
        !           201:                rt->rt_state |= RTS_CHANGED;
        !           202:                TRACE_ACTION(CHANGE TO, rt);
        !           203:        }
        !           204:        if (doioctl && install) {
        !           205: #ifndef RTM_ADD
        !           206:                if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
        !           207:                  syslog(LOG_ERR, "SIOCADDRT dst %s, gw %s: %m",
        !           208:                   xns_ntoa(&((struct sockaddr_ns *)&rt->rt_dst)->sns_addr),
        !           209:                   xns_ntoa(&((struct sockaddr_ns *)&rt->rt_router)->sns_addr));
        !           210:                if (delete && ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
        !           211:                        perror("SIOCDELRT");
        !           212: #else
        !           213:                if (delete && ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
        !           214:                        perror("SIOCDELRT");
        !           215:                if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
        !           216:                  syslog(LOG_ERR, "SIOCADDRT dst %s, gw %s: %m",
        !           217:                   xns_ntoa(&((struct sockaddr_ns *)&rt->rt_dst)->sns_addr),
        !           218:                   xns_ntoa(&((struct sockaddr_ns *)&rt->rt_router)->sns_addr));
        !           219: #endif
        !           220:        }
        !           221: }
        !           222: 
        !           223: rtdelete(rt)
        !           224:        struct rt_entry *rt;
        !           225: {
        !           226: 
        !           227:        struct sockaddr *sa = &(rt->rt_rt.rt_gateway);
        !           228:        FIXLEN(sa);
        !           229: #undef rt_dst
        !           230:        sa = &(rt->rt_rt.rt_dst);
        !           231:        FIXLEN(sa);
        !           232:        if (rt->rt_state & RTS_INTERFACE) {
        !           233:                syslog(LOG_ERR, "deleting route to interface %s (timed out)",
        !           234:                        rt->rt_ifp->int_name);
        !           235:        }
        !           236:        TRACE_ACTION(DELETE, rt);
        !           237:        if (install && ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
        !           238:                perror("SIOCDELRT");
        !           239:        remque(rt);
        !           240:        free((char *)rt);
        !           241: }
        !           242: 
        !           243: rtinit()
        !           244: {
        !           245:        register struct rthash *rh;
        !           246: 
        !           247:        for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
        !           248:                rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
        !           249:        for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
        !           250:                rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
        !           251: }

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