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Annotation of XNU/bsd/net/if_ethersubr.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1989, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #if NOTFB31
        !            58: #include "opt_atalk.h"
        !            59: #include "opt_inet.h"
        !            60: #include "opt_ipx.h"
        !            61: #include "opt_bdg.h"
        !            62: #endif
        !            63: 
        !            64: #include <sys/param.h>
        !            65: #include <sys/systm.h>
        !            66: #include <sys/kernel.h>
        !            67: #include <sys/malloc.h>
        !            68: #include <sys/mbuf.h>
        !            69: #include <sys/socket.h>
        !            70: #include <sys/sockio.h>
        !            71: #include <sys/sysctl.h>
        !            72: 
        !            73: #include <net/if.h>
        !            74: #include <net/netisr.h>
        !            75: #include <net/route.h>
        !            76: #include <net/if_llc.h>
        !            77: #include <net/if_dl.h>
        !            78: #include <net/if_types.h>
        !            79: #include <net/ndrv.h>
        !            80: 
        !            81: #if INET
        !            82: #include <netinet/in.h>
        !            83: #include <netinet/in_var.h>
        !            84: #include <netinet/if_ether.h>
        !            85: #include <netinet/in_systm.h>
        !            86: #include <netinet/ip.h>
        !            87: #endif
        !            88: 
        !            89: #if IPX
        !            90: #include <netipx/ipx.h>
        !            91: #include <netipx/ipx_if.h>
        !            92: #endif
        !            93: 
        !            94: #if NS
        !            95: #include <netns/ns.h>
        !            96: #include <netns/ns_if.h>
        !            97: ushort ns_nettype;
        !            98: int ether_outputdebug = 0;
        !            99: int ether_inputdebug = 0;
        !           100: #endif
        !           101: 
        !           102: #if ISO
        !           103: #include <netiso/argo_debug.h>
        !           104: #include <netiso/iso.h>
        !           105: #include <netiso/iso_var.h>
        !           106: #include <netiso/iso_snpac.h>
        !           107: #endif
        !           108: 
        !           109: /*#if LLC
        !           110: #include <netccitt/dll.h>
        !           111: #include <netccitt/llc_var.h>
        !           112: #endif*/
        !           113: 
        !           114: #include <sys/socketvar.h>
        !           115: #include <net/if_blue.h>
        !           116: 
        !           117: struct BlueFilter RhapFilter[BFCount];
        !           118: int BFIx;                      /* 0 for Atalk; 1..9 for IP */
        !           119: 
        !           120: 
        !           121: #if LLC && CCITT
        !           122: extern struct ifqueue pkintrq;
        !           123: #endif
        !           124: 
        !           125: #if BRIDGE
        !           126: #include <net/bridge.h>
        !           127: #endif
        !           128: 
        !           129: /* #include "vlan.h" */
        !           130: #if NVLAN > 0
        !           131: #include <net/if_vlan_var.h>
        !           132: #endif /* NVLAN > 0 */
        !           133: 
        !           134: static int ether_resolvemulti __P((struct ifnet *, struct sockaddr **, 
        !           135:                                    struct sockaddr *));
        !           136: extern u_char  etherbroadcastaddr[];
        !           137: #define senderr(e) do { error = (e); goto bad;} while (0)
        !           138: #define IFP2AC(IFP) ((struct arpcom *)IFP)
        !           139: 
        !           140: /*
        !           141:  * Perform common duties while attaching to interface list
        !           142:  */
        !           143: 
        !           144: 
        !           145: void
        !           146: ether_ifattach(ifp)
        !           147:        register struct ifnet *ifp;
        !           148: {
        !           149:        register struct ifaddr *ifa;
        !           150:        register struct sockaddr_dl *sdl;
        !           151:        boolean_t funnel_state;
        !           152: 
        !           153:        funnel_state = thread_set_funneled(TRUE);
        !           154:        printf("ether_ifattach called for %s\n", ifp->if_name);
        !           155:        ether_family_init();
        !           156: 
        !           157:        ifp->if_name = "en";
        !           158:        ifp->if_family = APPLE_IF_FAM_ETHERNET;
        !           159:        ifp->if_type = IFT_ETHER;
        !           160:        ifp->if_addrlen = 6;
        !           161:        ifp->if_hdrlen = 14;
        !           162:        ifp->if_mtu = ETHERMTU;
        !           163:        ifp->if_resolvemulti = ether_resolvemulti;
        !           164:        if (ifp->if_baudrate == 0)
        !           165:            ifp->if_baudrate = 10000000;
        !           166: 
        !           167:        dlil_if_attach(ifp);
        !           168:        ifa = ifnet_addrs[ifp->if_index - 1];
        !           169:        if (ifa == 0) {
        !           170:                printf("ether_ifattach: no lladdr!\n");
        !           171:                (void) thread_set_funneled(funnel_state);
        !           172:                return;
        !           173:        }
        !           174:        sdl = (struct sockaddr_dl *)ifa->ifa_addr;
        !           175:        sdl->sdl_type = IFT_ETHER;
        !           176:        sdl->sdl_alen = ifp->if_addrlen;
        !           177:        bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
        !           178:        (void) thread_set_funneled(funnel_state);
        !           179: }
        !           180: 
        !           181: SYSCTL_DECL(_net_link);
        !           182: SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
        !           183: 
        !           184: int
        !           185: ether_resolvemulti(ifp, llsa, sa)
        !           186:        struct ifnet *ifp;
        !           187:        struct sockaddr **llsa;
        !           188:        struct sockaddr *sa;
        !           189: {
        !           190:        struct sockaddr_dl *sdl;
        !           191:        struct sockaddr_in *sin;
        !           192:        u_char *e_addr;
        !           193: 
        !           194:        switch(sa->sa_family) {
        !           195:        case AF_UNSPEC:
        !           196:                /* AppleTalk uses AF_UNSPEC for multicast registration.
        !           197:                 * No mapping needed. Just check that it's a valid MC address.
        !           198:                 */
        !           199:                e_addr = &sa->sa_data[0];
        !           200:                if ((e_addr[0] & 1) != 1)
        !           201:                        return EADDRNOTAVAIL;
        !           202:                *llsa = 0;
        !           203:                return 0;
        !           204: 
        !           205:        case AF_LINK:
        !           206:                /* 
        !           207:                 * No mapping needed. Just check that it's a valid MC address.
        !           208:                 */
        !           209:                sdl = (struct sockaddr_dl *)sa;
        !           210:                e_addr = LLADDR(sdl);
        !           211:                if ((e_addr[0] & 1) != 1)
        !           212:                        return EADDRNOTAVAIL;
        !           213:                *llsa = 0;
        !           214:                return 0;
        !           215: 
        !           216: #if INET
        !           217:        case AF_INET:
        !           218:                sin = (struct sockaddr_in *)sa;
        !           219:                if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
        !           220:                        return EADDRNOTAVAIL;
        !           221:                MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
        !           222:                       M_WAITOK);
        !           223:                sdl->sdl_len = sizeof *sdl;
        !           224:                sdl->sdl_family = AF_LINK;
        !           225:                sdl->sdl_index = ifp->if_index;
        !           226:                sdl->sdl_type = IFT_ETHER;
        !           227:                sdl->sdl_nlen = 0;
        !           228:                sdl->sdl_alen = ETHER_ADDR_LEN;
        !           229:                sdl->sdl_slen = 0;
        !           230:                e_addr = LLADDR(sdl);
        !           231:                ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
        !           232:                *llsa = (struct sockaddr *)sdl;
        !           233:                return 0;
        !           234: #endif
        !           235: 
        !           236:        default:
        !           237:                /* 
        !           238:                 * Well, the text isn't quite right, but it's the name
        !           239:                 * that counts...
        !           240:                 */
        !           241:                return EAFNOSUPPORT;
        !           242:        }
        !           243: }
        !           244: 
        !           245: 
        !           246: 
        !           247: 
        !           248: 
        !           249: u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
        !           250: u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
        !           251: /*
        !           252:  * Add an Ethernet multicast address or range of addresses to the list for a
        !           253:  * given interface.
        !           254:  */
        !           255: int
        !           256: ether_addmulti(ifr, ac)
        !           257:        struct ifreq *ifr;
        !           258:        register struct arpcom *ac;
        !           259: {
        !           260:        register struct ether_multi *enm;
        !           261:        struct sockaddr_in *sin;
        !           262:        u_char addrlo[6];
        !           263:        u_char addrhi[6];
        !           264:        int s = splimp();
        !           265: 
        !           266:        switch (ifr->ifr_addr.sa_family) {
        !           267: 
        !           268:        case AF_UNSPEC:
        !           269:                bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
        !           270:                bcopy(addrlo, addrhi, 6);
        !           271:                break;
        !           272: 
        !           273: #if INET
        !           274:        case AF_INET:
        !           275:                sin = (struct sockaddr_in *)&(ifr->ifr_addr);
        !           276:                if (sin->sin_addr.s_addr == INADDR_ANY) {
        !           277:                        /*
        !           278:                         * An IP address of INADDR_ANY means listen to all
        !           279:                         * of the Ethernet multicast addresses used for IP.
        !           280:                         * (This is for the sake of IP multicast routers.)
        !           281:                         */
        !           282:                        bcopy(ether_ipmulticast_min, addrlo, 6);
        !           283:                        bcopy(ether_ipmulticast_max, addrhi, 6);
        !           284:                }
        !           285:                else {
        !           286:                        ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
        !           287:                        bcopy(addrlo, addrhi, 6);
        !           288:                }
        !           289:                break;
        !           290: #endif
        !           291: 
        !           292:        default:
        !           293:                splx(s);
        !           294:                return (EAFNOSUPPORT);
        !           295:        }
        !           296: 
        !           297:        /*
        !           298:         * Verify that we have valid Ethernet multicast addresses.
        !           299:         */
        !           300:        if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
        !           301:                splx(s);
        !           302:                return (EINVAL);
        !           303:        }
        !           304:        /*
        !           305:         * See if the address range is already in the list.
        !           306:         */
        !           307:        ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
        !           308:        if (enm != NULL) {
        !           309:                /*
        !           310:                 * Found it; just increment the reference count.
        !           311:                 */
        !           312:                ++enm->enm_refcount;
        !           313:                splx(s);
        !           314:                return (0);
        !           315:        }
        !           316:        /*
        !           317:         * New address or range; malloc a new multicast record
        !           318:         * and link it into the interface's multicast list.
        !           319:         */
        !           320:        enm = (struct ether_multi *)_MALLOC(sizeof(*enm), M_IFMADDR, M_WAITOK);
        !           321:        if (enm == NULL) {
        !           322:                splx(s);
        !           323:                return (ENOBUFS);
        !           324:        }
        !           325:        bcopy(addrlo, enm->enm_addrlo, 6);
        !           326:        bcopy(addrhi, enm->enm_addrhi, 6);
        !           327:        enm->enm_ac = ac;
        !           328:        enm->enm_refcount = 1;
        !           329:        enm->enm_next = ac->ac_multiaddrs;
        !           330:        ac->ac_multiaddrs = enm;
        !           331:        splx(s);
        !           332:        /*
        !           333:         * Return ENETRESET to inform the driver that the list has changed
        !           334:         * and its reception filter should be adjusted accordingly.
        !           335:         */
        !           336:        return (ENETRESET);
        !           337: }
        !           338: 
        !           339: /*
        !           340:  * Delete a multicast address record.
        !           341:  */
        !           342: int
        !           343: ether_delmulti(ifr, ac, ret_mca)
        !           344:        struct ifreq *ifr;
        !           345:        register struct arpcom *ac;
        !           346:        struct ether_addr * ret_mca;
        !           347: {
        !           348:        register struct ether_multi *enm;
        !           349:        register struct ether_multi **p;
        !           350:        struct sockaddr_in *sin;
        !           351:        u_char addrlo[6];
        !           352:        u_char addrhi[6];
        !           353:        int s = splimp();
        !           354: 
        !           355:        switch (ifr->ifr_addr.sa_family) {
        !           356: 
        !           357:        case AF_UNSPEC:
        !           358:                bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
        !           359:                bcopy(addrlo, addrhi, 6);
        !           360:                break;
        !           361: 
        !           362: #if INET
        !           363:        case AF_INET:
        !           364:                sin = (struct sockaddr_in *)&(ifr->ifr_addr);
        !           365:                if (sin->sin_addr.s_addr == INADDR_ANY) {
        !           366:                        /*
        !           367:                         * An IP address of INADDR_ANY means stop listening
        !           368:                         * to the range of Ethernet multicast addresses used
        !           369:                         * for IP.
        !           370:                         */
        !           371:                        bcopy(ether_ipmulticast_min, addrlo, 6);
        !           372:                        bcopy(ether_ipmulticast_max, addrhi, 6);
        !           373:                }
        !           374:                else {
        !           375:                        ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
        !           376:                        bcopy(addrlo, addrhi, 6);
        !           377:                }
        !           378:                break;
        !           379: #endif
        !           380: 
        !           381:        default:
        !           382:                splx(s);
        !           383:                return (EAFNOSUPPORT);
        !           384:        }
        !           385: 
        !           386:        /*
        !           387:         * Look up the address in our list.
        !           388:         */
        !           389:        ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
        !           390:        if (enm == NULL) {
        !           391:                splx(s);
        !           392:                return (ENXIO);
        !           393:        }
        !           394:        if (--enm->enm_refcount != 0) {
        !           395:                /*
        !           396:                 * Still some claims to this record.
        !           397:                 */
        !           398:                splx(s);
        !           399:                return (0);
        !           400:        }
        !           401: 
        !           402:        /* save the low and high address of the range before deletion */
        !           403:        if (ret_mca) {
        !           404:                *ret_mca        = *((struct ether_addr *)addrlo);
        !           405:                *(ret_mca + 1)  = *((struct ether_addr *)addrhi);
        !           406:        }
        !           407: 
        !           408:        /*
        !           409:         * No remaining claims to this record; unlink and free it.
        !           410:         */
        !           411:        for (p = &enm->enm_ac->ac_multiaddrs;
        !           412:             *p != enm;
        !           413:             p = &(*p)->enm_next)
        !           414:                continue;
        !           415:        *p = (*p)->enm_next;
        !           416:        FREE(enm, M_IFMADDR);
        !           417:        splx(s);
        !           418:        /*
        !           419:         * Return ENETRESET to inform the driver that the list has changed
        !           420:         * and its reception filter should be adjusted accordingly.
        !           421:         */
        !           422:        return (ENETRESET);
        !           423: }
        !           424: 
        !           425: 
        !           426: /*
        !           427:  * NB: need to register Atalk addresses from MacOSX
        !           428:  */
        !           429: int
        !           430: if_register(register struct BlueFilter *f
        !           431: #if BF_if
        !           432:            ,
        !           433:            register struct ifnet *ifp
        !           434: #endif
        !           435:            )
        !           436: {      register int ix;
        !           437:        register struct BlueFilter *nf;
        !           438: 
        !           439:        if (f->BF_flags & BF_VALID)
        !           440:                return(EINVAL);
        !           441:        if (f->BF_flags & BF_IP)
        !           442:        {       if (BFIx == 0)
        !           443:                        ix = BFIx = 1; /* Starting at 1 for IP */
        !           444:                else if (BFIx >= BFCount)
        !           445:                        return(0);              /* We'll just deal with it */
        !           446:                else
        !           447:                        ix = ++BFIx;
        !           448:        } else if (!(f->BF_flags & BF_ATALK))
        !           449:                return(EINVAL);
        !           450:        else                    /* AppleTalk */
        !           451:                ix = 0;
        !           452: 
        !           453:        nf = &RhapFilter[ix];
        !           454:        *nf = *f;
        !           455:        nf->BF_flags |= BF_VALID;
        !           456: #if BF_if
        !           457:        nf->BF_if = ifp;
        !           458: #endif
        !           459:        return(0);
        !           460: }
        !           461: 
        !           462: /*
        !           463:  * Convert Ethernet address to printable (loggable) representation.
        !           464:  */
        !           465: static u_char digits[] = "0123456789abcdef";
        !           466: char *
        !           467: ether_sprintf(p, ap)
        !           468:        register u_char *p;
        !           469:         register u_char *ap;
        !           470: {      register char *cp;
        !           471:         register i;
        !           472: 
        !           473:         for (cp = p, i = 0; i < 6; i++) {
        !           474:                 *cp++ = digits[*ap >> 4];
        !           475:                 *cp++ = digits[*ap++ & 0xf];
        !           476:                 *cp++ = ':';
        !           477:         }
        !           478:         *--cp = 0;
        !           479:         return (p);
        !           480: }

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