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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983, 1988 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   5.17 (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: #include <sys/syslog.h>
        !            31: 
        !            32: #ifndef DEBUG
        !            33: #define        DEBUG   0
        !            34: #endif
        !            35: 
        !            36: #ifdef RTM_ADD
        !            37: #define FIXLEN(s) {if ((s)->sa_len == 0) (s)->sa_len = sizeof *(s);}
        !            38: #else
        !            39: #define FIXLEN(s) { }
        !            40: #endif
        !            41: 
        !            42: int    install = !DEBUG;               /* if 1 call kernel */
        !            43: 
        !            44: /*
        !            45:  * Lookup dst in the tables for an exact match.
        !            46:  */
        !            47: struct rt_entry *
        !            48: rtlookup(dst)
        !            49:        struct sockaddr *dst;
        !            50: {
        !            51:        register struct rt_entry *rt;
        !            52:        register struct rthash *rh;
        !            53:        register u_int hash;
        !            54:        struct afhash h;
        !            55:        int doinghost = 1;
        !            56: 
        !            57:        if (dst->sa_family >= af_max)
        !            58:                return (0);
        !            59:        (*afswitch[dst->sa_family].af_hash)(dst, &h);
        !            60:        hash = h.afh_hosthash;
        !            61:        rh = &hosthash[hash & ROUTEHASHMASK];
        !            62: again:
        !            63:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            64:                if (rt->rt_hash != hash)
        !            65:                        continue;
        !            66:                if (equal(&rt->rt_dst, dst))
        !            67:                        return (rt);
        !            68:        }
        !            69:        if (doinghost) {
        !            70:                doinghost = 0;
        !            71:                hash = h.afh_nethash;
        !            72:                rh = &nethash[hash & ROUTEHASHMASK];
        !            73:                goto again;
        !            74:        }
        !            75:        return (0);
        !            76: }
        !            77: 
        !            78: struct sockaddr wildcard;      /* zero valued cookie for wildcard searches */
        !            79: 
        !            80: /*
        !            81:  * Find a route to dst as the kernel would.
        !            82:  */
        !            83: struct rt_entry *
        !            84: rtfind(dst)
        !            85:        struct sockaddr *dst;
        !            86: {
        !            87:        register struct rt_entry *rt;
        !            88:        register struct rthash *rh;
        !            89:        register u_int hash;
        !            90:        struct afhash h;
        !            91:        int af = dst->sa_family;
        !            92:        int doinghost = 1, (*match)();
        !            93: 
        !            94:        if (af >= af_max)
        !            95:                return (0);
        !            96:        (*afswitch[af].af_hash)(dst, &h);
        !            97:        hash = h.afh_hosthash;
        !            98:        rh = &hosthash[hash & ROUTEHASHMASK];
        !            99: 
        !           100: again:
        !           101:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !           102:                if (rt->rt_hash != hash)
        !           103:                        continue;
        !           104:                if (doinghost) {
        !           105:                        if (equal(&rt->rt_dst, dst))
        !           106:                                return (rt);
        !           107:                } else {
        !           108:                        if (rt->rt_dst.sa_family == af &&
        !           109:                            (*match)(&rt->rt_dst, dst))
        !           110:                                return (rt);
        !           111:                }
        !           112:        }
        !           113:        if (doinghost) {
        !           114:                doinghost = 0;
        !           115:                hash = h.afh_nethash;
        !           116:                rh = &nethash[hash & ROUTEHASHMASK];
        !           117:                match = afswitch[af].af_netmatch;
        !           118:                goto again;
        !           119:        }
        !           120: #ifdef notyet
        !           121:        /*
        !           122:         * Check for wildcard gateway, by convention network 0.
        !           123:         */
        !           124:        if (dst != &wildcard) {
        !           125:                dst = &wildcard, hash = 0;
        !           126:                goto again;
        !           127:        }
        !           128: #endif
        !           129:        return (0);
        !           130: }
        !           131: 
        !           132: rtadd(dst, gate, metric, state)
        !           133:        struct sockaddr *dst, *gate;
        !           134:        int metric, state;
        !           135: {
        !           136:        struct afhash h;
        !           137:        register struct rt_entry *rt;
        !           138:        struct rthash *rh;
        !           139:        int af = dst->sa_family, flags;
        !           140:        u_int hash;
        !           141: 
        !           142:        if (af >= af_max)
        !           143:                return;
        !           144:        (*afswitch[af].af_hash)(dst, &h);
        !           145:        flags = (*afswitch[af].af_rtflags)(dst);
        !           146:        /*
        !           147:         * Subnet flag isn't visible to kernel, move to state.  XXX
        !           148:         */
        !           149:        FIXLEN(dst);
        !           150:        FIXLEN(gate);
        !           151:        if (flags & RTF_SUBNET) {
        !           152:                state |= RTS_SUBNET;
        !           153:                flags &= ~RTF_SUBNET;
        !           154:        }
        !           155:        if (flags & RTF_HOST) {
        !           156:                hash = h.afh_hosthash;
        !           157:                rh = &hosthash[hash & ROUTEHASHMASK];
        !           158:        } else {
        !           159:                hash = h.afh_nethash;
        !           160:                rh = &nethash[hash & ROUTEHASHMASK];
        !           161:        }
        !           162:        rt = (struct rt_entry *)malloc(sizeof (*rt));
        !           163:        if (rt == 0)
        !           164:                return;
        !           165:        rt->rt_hash = hash;
        !           166:        rt->rt_dst = *dst;
        !           167:        rt->rt_router = *gate;
        !           168:        rt->rt_timer = 0;
        !           169:        rt->rt_flags = RTF_UP | flags;
        !           170:        rt->rt_state = state | RTS_CHANGED;
        !           171:        rt->rt_ifp = if_ifwithdstaddr(&rt->rt_dst);
        !           172:        if (rt->rt_ifp == 0)
        !           173:                rt->rt_ifp = if_ifwithnet(&rt->rt_router);
        !           174:        if ((state & RTS_INTERFACE) == 0)
        !           175:                rt->rt_flags |= RTF_GATEWAY;
        !           176:        rt->rt_metric = metric;
        !           177:        insque(rt, rh);
        !           178:        TRACE_ACTION("ADD", rt);
        !           179:        /*
        !           180:         * If the ioctl fails because the gateway is unreachable
        !           181:         * from this host, discard the entry.  This should only
        !           182:         * occur because of an incorrect entry in /etc/gateways.
        !           183:         */
        !           184:        if (install && (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 &&
        !           185:            ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
        !           186:                if (errno != EEXIST && gate->sa_family < af_max)
        !           187:                        syslog(LOG_ERR,
        !           188:                        "adding route to net/host %s through gateway %s: %m\n",
        !           189:                           (*afswitch[dst->sa_family].af_format)(dst),
        !           190:                           (*afswitch[gate->sa_family].af_format)(gate));
        !           191:                perror("SIOCADDRT");
        !           192:                if (errno == ENETUNREACH) {
        !           193:                        TRACE_ACTION("DELETE", rt);
        !           194:                        remque(rt);
        !           195:                        free((char *)rt);
        !           196:                }
        !           197:        }
        !           198: }
        !           199: 
        !           200: rtchange(rt, gate, metric)
        !           201:        struct rt_entry *rt;
        !           202:        struct sockaddr *gate;
        !           203:        short metric;
        !           204: {
        !           205:        int add = 0, delete = 0, newgateway = 0;
        !           206:        struct rtentry oldroute;
        !           207: 
        !           208:        FIXLEN(gate);
        !           209:        FIXLEN(&(rt->rt_router));
        !           210:        FIXLEN(&(rt->rt_dst));
        !           211:        if (!equal(&rt->rt_router, gate)) {
        !           212:                newgateway++;
        !           213:                TRACE_ACTION("CHANGE FROM ", rt);
        !           214:        } else if (metric != rt->rt_metric)
        !           215:                TRACE_NEWMETRIC(rt, metric);
        !           216:        if ((rt->rt_state & RTS_INTERNAL) == 0) {
        !           217:                /*
        !           218:                 * If changing to different router, we need to add
        !           219:                 * new route and delete old one if in the kernel.
        !           220:                 * If the router is the same, we need to delete
        !           221:                 * the route if has become unreachable, or re-add
        !           222:                 * it if it had been unreachable.
        !           223:                 */
        !           224:                if (newgateway) {
        !           225:                        add++;
        !           226:                        if (rt->rt_metric != HOPCNT_INFINITY)
        !           227:                                delete++;
        !           228:                } else if (metric == HOPCNT_INFINITY)
        !           229:                        delete++;
        !           230:                else if (rt->rt_metric == HOPCNT_INFINITY)
        !           231:                        add++;
        !           232:        }
        !           233:        if (delete)
        !           234:                oldroute = rt->rt_rt;
        !           235:        if ((rt->rt_state & RTS_INTERFACE) && delete) {
        !           236:                rt->rt_state &= ~RTS_INTERFACE;
        !           237:                rt->rt_flags |= RTF_GATEWAY;
        !           238:                if (metric > rt->rt_metric && delete)
        !           239:                        syslog(LOG_ERR, "%s route to interface %s (timed out)",
        !           240:                            add? "changing" : "deleting",
        !           241:                            rt->rt_ifp->int_name);
        !           242:        }
        !           243:        if (add) {
        !           244:                rt->rt_router = *gate;
        !           245:                rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
        !           246:                if (rt->rt_ifp == 0)
        !           247:                        rt->rt_ifp = if_ifwithnet(&rt->rt_router);
        !           248:        }
        !           249:        rt->rt_metric = metric;
        !           250:        rt->rt_state |= RTS_CHANGED;
        !           251:        if (newgateway)
        !           252:                TRACE_ACTION("CHANGE TO   ", rt);
        !           253: #ifndef RTM_ADD
        !           254:        if (add && install)
        !           255:                if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
        !           256:                        perror("SIOCADDRT");
        !           257:        if (delete && install)
        !           258:                if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
        !           259:                        perror("SIOCDELRT");
        !           260: #else
        !           261:        if (delete && install)
        !           262:                if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
        !           263:                        perror("SIOCDELRT");
        !           264:        if (add && install) {
        !           265:                if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
        !           266:                        perror("SIOCADDRT");
        !           267:        }
        !           268: #endif
        !           269: }
        !           270: 
        !           271: rtdelete(rt)
        !           272:        struct rt_entry *rt;
        !           273: {
        !           274: 
        !           275:        TRACE_ACTION("DELETE", rt);
        !           276:        FIXLEN(&(rt->rt_router));
        !           277:        FIXLEN(&(rt->rt_dst));
        !           278:        if (rt->rt_metric < HOPCNT_INFINITY) {
        !           279:            if ((rt->rt_state & (RTS_INTERFACE|RTS_INTERNAL)) == RTS_INTERFACE)
        !           280:                syslog(LOG_ERR,
        !           281:                    "deleting route to interface %s? (timed out?)",
        !           282:                    rt->rt_ifp->int_name);
        !           283:            if (install &&
        !           284:                (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 &&
        !           285:                ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
        !           286:                    perror("SIOCDELRT");
        !           287:        }
        !           288:        remque(rt);
        !           289:        free((char *)rt);
        !           290: }
        !           291: 
        !           292: rtdeleteall(sig)
        !           293:        int sig;
        !           294: {
        !           295:        register struct rthash *rh;
        !           296:        register struct rt_entry *rt;
        !           297:        struct rthash *base = hosthash;
        !           298:        int doinghost = 1;
        !           299: 
        !           300: again:
        !           301:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !           302:                rt = rh->rt_forw;
        !           303:                for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !           304:                        if (rt->rt_state & RTS_INTERFACE ||
        !           305:                            rt->rt_metric >= HOPCNT_INFINITY)
        !           306:                                continue;
        !           307:                        TRACE_ACTION("DELETE", rt);
        !           308:                        if ((rt->rt_state & (RTS_INTERNAL|RTS_EXTERNAL)) == 0 &&
        !           309:                            ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
        !           310:                                perror("SIOCDELRT");
        !           311:                }
        !           312:        }
        !           313:        if (doinghost) {
        !           314:                doinghost = 0;
        !           315:                base = nethash;
        !           316:                goto again;
        !           317:        }
        !           318:        exit(sig);
        !           319: }
        !           320: 
        !           321: /*
        !           322:  * If we have an interface to the wide, wide world,
        !           323:  * add an entry for an Internet default route (wildcard) to the internal
        !           324:  * tables and advertise it.  This route is not added to the kernel routes,
        !           325:  * but this entry prevents us from listening to other people's defaults
        !           326:  * and installing them in the kernel here.
        !           327:  */
        !           328: rtdefault()
        !           329: {
        !           330:        extern struct sockaddr inet_default;
        !           331: 
        !           332:        rtadd(&inet_default, &inet_default, 1,
        !           333:                RTS_CHANGED | RTS_PASSIVE | RTS_INTERNAL);
        !           334: }
        !           335: 
        !           336: rtinit()
        !           337: {
        !           338:        register struct rthash *rh;
        !           339: 
        !           340:        for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
        !           341:                rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
        !           342:        for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
        !           343:                rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
        !           344: }

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