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Annotation of XNU/bsd/netinet/in_bootp.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) 1988-1999 Apple Computer, Inc. All Rights Reserved 
        !            24:  */
        !            25: 
        !            26: /*
        !            27:  * bootp.c
        !            28:  * - be a BOOTP client over a particular interface to retrieve
        !            29:  *   the IP address, netmask, and router
        !            30:  */
        !            31: 
        !            32: /* 
        !            33:  * Modification History
        !            34:  *
        !            35:  * February 19, 1999   Dieter Siegmund ([email protected])
        !            36:  * - completely rewritten
        !            37:  */
        !            38: 
        !            39: #include <sys/param.h>
        !            40: #include <sys/types.h>
        !            41: #include <mach/boolean.h>
        !            42: #include <sys/kernel.h>
        !            43: #include <sys/errno.h>
        !            44: #include <sys/file.h>
        !            45: #include <sys/uio.h>
        !            46: #include <sys/ioctl.h>
        !            47: #include <sys/time.h>
        !            48: #include <sys/mbuf.h>
        !            49: #include <sys/vnode.h>
        !            50: #include <sys/socket.h>
        !            51: #include <sys/socketvar.h>
        !            52: #include <net/if.h>
        !            53: #include <net/if_dl.h>
        !            54: #include <net/if_types.h>
        !            55: #include <net/route.h>
        !            56: #include <netinet/in.h>
        !            57: #include <netinet/in_systm.h>
        !            58: #include <netinet/if_ether.h>
        !            59: #include <netinet/ip.h>
        !            60: #include <netinet/ip_var.h>
        !            61: #include <netinet/udp.h>
        !            62: #include <netinet/udp_var.h>
        !            63: #include <netinet/ip_icmp.h>
        !            64: #include <netinet/bootp.h>
        !            65: #include <sys/systm.h>
        !            66: #include <sys/malloc.h>
        !            67: 
        !            68: //#define BOOTP_DEBUG
        !            69: 
        !            70: #ifdef BOOTP_DEBUG
        !            71: #define        dprintf(x) printf x;
        !            72: #else  BOOTP_DEBUG
        !            73: #define        dprintf(x)
        !            74: #endif BOOTP_DEBUG
        !            75: 
        !            76: /* ip address formatting macros */
        !            77: #define IP_FORMAT      "%d.%d.%d.%d"
        !            78: #define IP_CH(ip)      ((u_char *)ip)
        !            79: #define IP_LIST(ip)    IP_CH(ip)[0],IP_CH(ip)[1],IP_CH(ip)[2],IP_CH(ip)[3]
        !            80: 
        !            81: /* tag values (from RFC 2132) */
        !            82: #define TAG_PAD                        0
        !            83: #define TAG_END                        255
        !            84: #define TAG_SUBNET_MASK                1
        !            85: #define TAG_ROUTER             3
        !            86: #define RFC_OPTIONS_MAGIC      { 99, 130, 83, 99 }
        !            87: static unsigned char           rfc_magic[4] = RFC_OPTIONS_MAGIC;
        !            88: 
        !            89: 
        !            90: static struct sockaddr_in      blank_sin = { sizeof(struct sockaddr_in),
        !            91:                                              AF_INET };
        !            92: 
        !            93: static __inline__ void
        !            94: print_reply(struct bootp *bp, int bp_len)
        !            95: {
        !            96:        int i, j, len;
        !            97: 
        !            98:        printf("bp_op = ");
        !            99:        if (bp->bp_op == BOOTREQUEST) printf("BOOTREQUEST\n");
        !           100:        else if (bp->bp_op == BOOTREPLY) printf("BOOTREPLY\n");
        !           101:        else
        !           102:        {
        !           103:                i = bp->bp_op;
        !           104:                printf("%d\n", i);
        !           105:        }
        !           106: 
        !           107:        i = bp->bp_htype;
        !           108:        printf("bp_htype = %d\n", i);
        !           109: 
        !           110:        len = bp->bp_hlen;
        !           111:        printf("bp_hlen = %d\n", len);
        !           112: 
        !           113:        i = bp->bp_hops;
        !           114:        printf("bp_hops = %d\n", i);
        !           115: 
        !           116:        printf("bp_xid = %lu\n", bp->bp_xid);
        !           117: 
        !           118:        printf("bp_secs = %u\n", bp->bp_secs);
        !           119: 
        !           120:        printf("bp_ciaddr = " IP_FORMAT "\n", IP_LIST(&bp->bp_ciaddr));
        !           121:        printf("bp_yiaddr = " IP_FORMAT "\n", IP_LIST(&bp->bp_yiaddr));
        !           122:        printf("bp_siaddr = " IP_FORMAT "\n", IP_LIST(&bp->bp_siaddr));
        !           123:        printf("bp_giaddr = " IP_FORMAT "\n", IP_LIST(&bp->bp_giaddr));
        !           124: 
        !           125:        printf("bp_chaddr = ");
        !           126:        for (j = 0; j < len; j++)
        !           127:        {
        !           128:                i = bp->bp_chaddr[j];
        !           129:                printf("%0x", i);
        !           130:                if (j < (len - 1)) printf(":");
        !           131:        }
        !           132:        printf("\n");
        !           133: 
        !           134:        printf("bp_sname = %s\n", bp->bp_sname);
        !           135:        printf("bp_file = %s\n", bp->bp_file);
        !           136: }
        !           137: 
        !           138: static __inline__ void
        !           139: print_reply_short(struct bootp *bp, int bp_len)
        !           140: {
        !           141:        printf("bp_yiaddr = " IP_FORMAT "\n", IP_LIST(&bp->bp_yiaddr));
        !           142:        printf("bp_sname = %s\n", bp->bp_sname);
        !           143: }
        !           144: 
        !           145: 
        !           146: static __inline__ long
        !           147: random_range(long bottom, long top)
        !           148: {
        !           149:     long number = top - bottom + 1;
        !           150:     long range_size = LONG_MAX / number;
        !           151:     return (((long)random()) / range_size + bottom);
        !           152: }
        !           153: 
        !           154: /*
        !           155:  * Function: make_bootp_request
        !           156:  * Purpose:
        !           157:  *   Create a "blank" bootp packet.
        !           158:  */
        !           159: static void
        !           160: make_bootp_request(struct bootp_packet * pkt, 
        !           161:                   u_char * hwaddr, u_char hwtype, u_char hwlen)
        !           162: {
        !           163:     bzero(pkt, sizeof (*pkt));
        !           164:     pkt->bp_ip.ip_v = IPVERSION;
        !           165:     pkt->bp_ip.ip_hl = sizeof (struct ip) >> 2;
        !           166:     pkt->bp_ip.ip_id = htons(ip_id++);
        !           167:     pkt->bp_ip.ip_ttl = MAXTTL;
        !           168:     pkt->bp_ip.ip_p = IPPROTO_UDP;
        !           169:     pkt->bp_ip.ip_src.s_addr = 0;
        !           170:     pkt->bp_ip.ip_dst.s_addr = htonl(INADDR_BROADCAST);
        !           171:     pkt->bp_udp.uh_sport = htons(IPPORT_BOOTPC);
        !           172:     pkt->bp_udp.uh_dport = htons(IPPORT_BOOTPS);
        !           173:     pkt->bp_udp.uh_sum = 0;
        !           174:     pkt->bp_bootp.bp_op = BOOTREQUEST;
        !           175:     pkt->bp_bootp.bp_htype = hwtype;
        !           176:     pkt->bp_bootp.bp_hlen = hwlen;
        !           177:     pkt->bp_bootp.bp_ciaddr.s_addr = 0;
        !           178:     bcopy(hwaddr, pkt->bp_bootp.bp_chaddr, hwlen);
        !           179:     bcopy(rfc_magic, pkt->bp_bootp.bp_vend, sizeof(rfc_magic));
        !           180:     pkt->bp_bootp.bp_vend[4] = TAG_END;
        !           181:     pkt->bp_udp.uh_ulen = htons(sizeof(pkt->bp_udp) + sizeof(pkt->bp_bootp));
        !           182:     pkt->bp_ip.ip_len = htons(sizeof(struct ip) + ntohs(pkt->bp_udp.uh_ulen));
        !           183:     pkt->bp_ip.ip_sum = 0;
        !           184:     return;
        !           185: }
        !           186: 
        !           187: /*
        !           188:  * Function: ip_pkt_to_mbuf
        !           189:  * Purpose:
        !           190:  *   Put the given IP packet into an mbuf, calculate the
        !           191:  *   IP checksum.
        !           192:  */
        !           193: struct mbuf *
        !           194: ip_pkt_to_mbuf(caddr_t pkt, int pktsize)
        !           195: {
        !           196:     struct ip *                ip;
        !           197:     struct mbuf        *       m;
        !           198:     
        !           199:     m = (struct mbuf *)m_devget(pkt, pktsize, 0, 0, 0);
        !           200:     if (m == 0) {
        !           201:        printf("bootp: ip_pkt_to_mbuf: m_devget failed\n");
        !           202:        return 0;
        !           203:     }
        !           204:     m->m_flags |= M_BCAST;
        !           205:     /* Compute the checksum */
        !           206:     ip = mtod(m, struct ip *);
        !           207:     ip->ip_sum = 0;
        !           208:     ip->ip_sum = in_cksum(m, sizeof (struct ip));
        !           209:     return (m);
        !           210: }
        !           211: 
        !           212: static __inline__ u_char *
        !           213: link_address(struct sockaddr_dl * dl_p)
        !           214: {
        !           215:     return (dl_p->sdl_data + dl_p->sdl_nlen);
        !           216: }
        !           217: 
        !           218: static __inline__ void
        !           219: link_print(struct sockaddr_dl * dl_p)
        !           220: {
        !           221:     int i;
        !           222: 
        !           223: #if 0
        !           224:     printf("len %d index %d family %d type 0x%x nlen %d alen %d"
        !           225:           " slen %d addr ", dl_p->sdl_len, 
        !           226:           dl_p->sdl_index,  dl_p->sdl_family, dl_p->sdl_type,
        !           227:           dl_p->sdl_nlen, dl_p->sdl_alen, dl_p->sdl_slen);
        !           228: #endif 0
        !           229:     for (i = 0; i < dl_p->sdl_alen; i++) 
        !           230:        printf("%s%x", i ? ":" : "", 
        !           231:               (link_address(dl_p))[i]);
        !           232:     printf("\n");
        !           233:     return;
        !           234: }
        !           235: 
        !           236: static struct sockaddr_dl *
        !           237: link_from_ifnet(struct ifnet * ifp)
        !           238: {
        !           239:     struct ifaddr * addr;
        !           240: 
        !           241: /*    for (addr = ifp->if_addrlist; addr; addr = addr->ifa_next) */
        !           242: 
        !           243:     TAILQ_FOREACH(addr, &ifp->if_addrhead, ifa_link) {
        !           244:        if (addr->ifa_addr->sa_family == AF_LINK) {
        !           245:            struct sockaddr_dl * dl_p = (struct sockaddr_dl *)(addr->ifa_addr);
        !           246:            
        !           247:            return (dl_p);
        !           248:        }
        !           249:     }
        !           250:     return (NULL);
        !           251: }
        !           252: 
        !           253: /*
        !           254:  * Function: send_bootp_request
        !           255:  * Purpose:
        !           256:  *     Send the request by calling the interface's output routine
        !           257:  *     bypassing routing code.
        !           258:  */
        !           259: static int
        !           260: send_bootp_request(struct ifnet * ifp, struct socket * so,
        !           261:                   struct bootp_packet * pkt)
        !           262: {
        !           263:     struct mbuf        *       m;
        !           264:     struct sockaddr_in sin;
        !           265:     
        !           266:     /* Address to send to */
        !           267:     sin = blank_sin;
        !           268:     sin.sin_port = htons(IPPORT_BOOTPS);
        !           269:     sin.sin_addr.s_addr = INADDR_BROADCAST;
        !           270:     
        !           271:     m = ip_pkt_to_mbuf((caddr_t)pkt, sizeof(*pkt));
        !           272:     return (dlil_output((u_long) ifp, m, 0, (struct sockaddr *)&sin, 0));
        !           273: }
        !           274: 
        !           275: /*
        !           276:  * Function: receive_packet
        !           277:  * Purpose:
        !           278:  *   Return a received packet or an error if none available.
        !           279:  */
        !           280: int
        !           281: receive_packet(struct socket * so, caddr_t pp, int psize)
        !           282: {
        !           283:     struct iovec       aiov;
        !           284:     struct uio         auio;
        !           285:     int                        rcvflg;
        !           286:     int                        error;
        !           287: 
        !           288:     aiov.iov_base = pp;
        !           289:     aiov.iov_len = psize;
        !           290:     auio.uio_iov = &aiov;
        !           291:     auio.uio_iovcnt = 1;
        !           292:     auio.uio_segflg = UIO_SYSSPACE;
        !           293:     auio.uio_offset = 0;
        !           294:     auio.uio_resid = psize;
        !           295:     auio.uio_rw = UIO_READ;
        !           296:     rcvflg = MSG_WAITALL;
        !           297:     
        !           298:     error = soreceive(so, (struct sockaddr **) 0, &auio, 0, 0, &rcvflg);
        !           299:     return (error);
        !           300: }
        !           301: 
        !           302: /*
        !           303:  * Function: bootp_timeout
        !           304:  * Purpose:
        !           305:  *   Wakeup the process waiting for something on a socket.
        !           306:  */
        !           307: static void
        !           308: bootp_timeout(struct socket * * socketflag)
        !           309: {
        !           310:     struct socket * so = *socketflag;
        !           311:     
        !           312:     dprintf(("bootp: timeout\n"));
        !           313: 
        !           314:     *socketflag = NULL;
        !           315:     sowakeup(so, &so->so_rcv);
        !           316:     return;
        !           317: }
        !           318: 
        !           319: #define TAG_OFFSET     0
        !           320: #define LEN_OFFSET     1
        !           321: #define OPTION_OFFSET  2
        !           322: 
        !           323: void *
        !           324: packet_option(struct bootp * pkt, u_char t) 
        !           325: {
        !           326:     void *             buffer = pkt->bp_vend + sizeof(rfc_magic);
        !           327:     int                        len;
        !           328:     unsigned char      option_len;
        !           329:     void *             ret = NULL;
        !           330:     unsigned char *    scan;
        !           331:     unsigned char      tag = TAG_PAD;
        !           332: 
        !           333:     len = sizeof(pkt->bp_vend) - sizeof(rfc_magic);
        !           334:     for (scan = buffer; len > 0; ) {
        !           335:        tag = scan[TAG_OFFSET];
        !           336:        if (tag == TAG_END) /* we hit the end of the options */
        !           337:            break;
        !           338:        if (tag == TAG_PAD) { /* discard pad characters */
        !           339:            scan++;
        !           340:            len--;
        !           341:        }
        !           342:        else {
        !           343:            if (t == tag && ret == NULL)
        !           344:                ret = scan + OPTION_OFFSET;
        !           345:            option_len = scan[LEN_OFFSET];
        !           346:            len -= (option_len + 2);
        !           347:            scan += (option_len + 2);
        !           348:        }
        !           349:     }
        !           350:     if (len < 0 || tag != TAG_END) { /* we ran off the end */
        !           351:        if (len < 0) {
        !           352:            dprintf(("bootp: error parsing options\n"));
        !           353:        }
        !           354:        else {
        !           355:            dprintf(("bootp: end tag missing\n"));
        !           356:        }
        !           357:        ret = NULL;
        !           358:     }
        !           359:     return (ret);
        !           360: }
        !           361: 
        !           362: /*
        !           363:  * Function: rate_packet
        !           364:  * Purpose:
        !           365:  *   Return an integer point rating value for the given bootp packet.
        !           366:  *   If yiaddr non-zero, the packet gets a rating of 1.
        !           367:  *   Another point is given if the packet contains the subnet mask,
        !           368:  *   and another if the router is present.
        !           369:  */
        !           370: #define GOOD_RATING    3
        !           371: static __inline__ int 
        !           372: rate_packet(struct bootp * pkt)
        !           373: {
        !           374:     int rating = 0;
        !           375: 
        !           376:     if (pkt->bp_yiaddr.s_addr) {
        !           377:        struct in_addr * ip;
        !           378: 
        !           379:        rating++;
        !           380:        ip = (struct in_addr *)packet_option(pkt, TAG_SUBNET_MASK);
        !           381:        if (ip)
        !           382:            rating++;
        !           383:        ip = (struct in_addr *)packet_option(pkt, TAG_ROUTER);
        !           384:        if (ip)
        !           385:            rating++;
        !           386:     }
        !           387:     return (rating);
        !           388: }
        !           389: 
        !           390: #define INITIAL_WAIT_SECS              4
        !           391: #define MAX_WAIT_SECS                  64
        !           392: #define GATHER_TIME_SECS               2
        !           393: #define RAND_TICKS                     (hz)    /* one second */
        !           394: 
        !           395: /*
        !           396:  * Function: bootp_loop
        !           397:  * Purpose:
        !           398:  *   Do the actual BOOTP protocol.
        !           399:  *   The algorithm sends out a packet, waits for a response.
        !           400:  *   We try max_try times, waiting in an exponentially increasing
        !           401:  *   amount of time.  Once we receive a good response, we start
        !           402:  *   a new time period called the "gather time", during which we
        !           403:  *   either find the perfect packet (one that has ip, mask and router)
        !           404:  *   or we continue to gather responses.  At the end of the gather period,
        !           405:  *   we use the best response gathered.
        !           406:  */
        !           407: static int
        !           408: bootp_loop(struct socket * so, struct ifnet * ifp, int max_try,
        !           409:           struct in_addr * iaddr_p, struct in_addr * netmask_p,
        !           410:           struct in_addr * router_p)
        !           411: {
        !           412:     struct timeval             current_time;
        !           413:     struct sockaddr_dl *       dl_p;
        !           414:     int                                error = 0;
        !           415:     char *                     hwaddr;
        !           416:     int                                hwlen;
        !           417:     char                       hwtype = 0;
        !           418:     struct bootp_packet *      request = NULL;
        !           419:     struct bootp *             reply = NULL;
        !           420:     struct bootp *             saved_reply = NULL;
        !           421:     struct timeval             start_time;
        !           422:     u_long                     xid;
        !           423:     int                                retry;
        !           424:     struct socket *            timeflag;
        !           425:     int                                wait_ticks = INITIAL_WAIT_SECS * hz;
        !           426: 
        !           427:     /* get the hardware address from the interface */
        !           428:     dl_p = link_from_ifnet(ifp);
        !           429:     if (dl_p == NULL) {
        !           430:        printf("bootp: can't get link address\n");
        !           431:        return (ENXIO);
        !           432:     }
        !           433: 
        !           434:     printf("bootp: h/w addr ");
        !           435:     link_print(dl_p);
        !           436: 
        !           437:     hwaddr = link_address(dl_p);
        !           438:     hwlen = dl_p->sdl_alen;
        !           439:     switch (dl_p->sdl_type) {
        !           440:         case IFT_ETHER:
        !           441:            hwtype = ARPHRD_ETHER;
        !           442:            break;
        !           443:         default:
        !           444:            printf("bootp: hardware type %d not supported\n",
        !           445:                   dl_p->sdl_type);
        !           446:            panic("bootp: hardware type not supported");
        !           447:            break;
        !           448:     }
        !           449: 
        !           450:     /* set transaction id and remember the start time */
        !           451:     microtime(&start_time);
        !           452:     current_time = start_time;
        !           453:     xid = random();
        !           454:     
        !           455:     /* make a request/reply packet */
        !           456:     request = (struct bootp_packet *)kalloc(sizeof(*request));
        !           457:     make_bootp_request(request, hwaddr, hwtype, hwlen);
        !           458:     reply = (struct bootp *)kalloc(sizeof(*reply));
        !           459:     saved_reply = (struct bootp *)kalloc(sizeof(*saved_reply));
        !           460:     iaddr_p->s_addr = 0;
        !           461:     printf("bootp: sending request");
        !           462:     for (retry = 0; retry < max_try; retry++) {
        !           463:        int             gather_count = 0;
        !           464:        int             last_rating = 0;
        !           465: 
        !           466:        /* Send the request */
        !           467:        printf(".");
        !           468:        request->bp_bootp.bp_secs = htons((u_short)(current_time.tv_sec 
        !           469:                                                    - start_time.tv_sec));
        !           470:        request->bp_bootp.bp_xid = htonl(xid);
        !           471:        error = send_bootp_request(ifp, so, request);
        !           472:        if (error)
        !           473:            goto cleanup;
        !           474: 
        !           475:        timeflag = so;
        !           476:        wait_ticks += random_range(-RAND_TICKS, RAND_TICKS);
        !           477:        dprintf(("bootp: waiting %d ticks\n", wait_ticks));
        !           478:        timeout(bootp_timeout, &timeflag, wait_ticks);
        !           479: 
        !           480:        while (TRUE) {
        !           481:            error = receive_packet(so, (caddr_t)reply, sizeof(*reply));
        !           482:            if (error == 0) {
        !           483:                dprintf(("\nbootp: received packet\n"));
        !           484:                if (ntohl(reply->bp_xid) == xid
        !           485:                    && reply->bp_yiaddr.s_addr
        !           486:                    && bcmp(reply->bp_chaddr, hwaddr, hwlen) == 0) {
        !           487:                    int rating;
        !           488: #ifdef BOOTP_DEBUG
        !           489:                    print_reply_short(reply, sizeof(*reply));
        !           490: #endif BOOTP_DEBUG
        !           491:                    rating = rate_packet(reply);
        !           492:                    if (rating > last_rating)
        !           493:                        *saved_reply = *reply;
        !           494:                    if (rating >= GOOD_RATING) {
        !           495:                        untimeout(bootp_timeout, &timeflag);
        !           496:                        goto save_values;
        !           497:                    }
        !           498:                    if (gather_count == 0) {
        !           499:                        untimeout(bootp_timeout, &timeflag);
        !           500:                        timeflag = so;
        !           501:                        timeout(bootp_timeout, &timeflag, 
        !           502:                                hz * GATHER_TIME_SECS);
        !           503:                    }
        !           504:                    gather_count++;
        !           505:                }
        !           506:                else {
        !           507:                    dprintf(("bootp: packet ignored\n"));
        !           508:                }
        !           509:            }
        !           510:            else if ((error != EWOULDBLOCK)) {
        !           511:                break;
        !           512:            }
        !           513:            else if (timeflag == NULL) { /* timed out */
        !           514:                if (gather_count) {
        !           515:                    dprintf(("bootp: gathering time has expired"));
        !           516:                    goto save_values; /* we have a packet */
        !           517:                }
        !           518:                break; /* retry */
        !           519:            }
        !           520:            else
        !           521:                sbwait(&so->so_rcv);
        !           522:        }
        !           523:        if (error && (error != EWOULDBLOCK)) {
        !           524:            dprintf(("bootp: failed to receive packets: %d\n", error));
        !           525:            untimeout(bootp_timeout, &timeflag);
        !           526:            goto cleanup;
        !           527:        }
        !           528:        wait_ticks *= 2;
        !           529:        if (wait_ticks > (MAX_WAIT_SECS * hz))
        !           530:            wait_ticks = MAX_WAIT_SECS * hz;
        !           531:        xid++;
        !           532:        microtime(&current_time);
        !           533:     }
        !           534:     error = ETIMEDOUT;
        !           535:     goto cleanup;
        !           536: 
        !           537:  save_values:
        !           538:     error = 0;
        !           539:     printf("\nbootp: got response from %s (" IP_FORMAT ")\n", 
        !           540:           saved_reply->bp_sname, IP_LIST(&saved_reply->bp_siaddr));
        !           541:     /* return the ip address */
        !           542:     *iaddr_p = saved_reply->bp_yiaddr;
        !           543:     {
        !           544:        struct in_addr * ip;
        !           545:        ip = (struct in_addr *)packet_option(saved_reply, TAG_SUBNET_MASK);
        !           546:        if (ip)
        !           547:            *netmask_p = *ip;
        !           548:        ip = (struct in_addr *)packet_option(saved_reply, TAG_ROUTER);
        !           549:        if (ip)
        !           550:            *router_p = *ip;
        !           551:     }
        !           552: 
        !           553:  cleanup:
        !           554:     if (request)
        !           555:        kfree((caddr_t)request, sizeof (*request));
        !           556:     if (reply)
        !           557:        kfree((caddr_t)reply, sizeof(*reply));
        !           558:     if (saved_reply)
        !           559:        kfree((caddr_t)saved_reply, sizeof(*saved_reply));
        !           560:     return (error);
        !           561: }
        !           562: 
        !           563: /*
        !           564:  * Routine: bootp
        !           565:  * Function:
        !           566:  *     Use the BOOTP protocol to resolve what our IP address should be
        !           567:  *     on a particular interface.
        !           568:  */
        !           569: int bootp(struct ifnet * ifp, struct in_addr * iaddr_p, int max_try,
        !           570:          struct in_addr * netmask_p, struct in_addr * router_p,
        !           571:          struct proc * procp)
        !           572: {
        !           573:     boolean_t                  addr_set = FALSE;
        !           574:     struct ifreq               ifr;
        !           575:     int                                error;
        !           576:     struct socket *            so = NULL;
        !           577: 
        !           578:     /* get a socket */
        !           579:     error = socreate(AF_INET, &so, SOCK_DGRAM, 0);
        !           580:     if (error) {
        !           581:        dprintf(("bootp: socreate failed %d\n", error));
        !           582:        return (error);
        !           583:     }
        !           584: 
        !           585:     /* assign the all-zeroes address */
        !           586:     bzero(&ifr, sizeof(ifr));
        !           587:     sprintf(ifr.ifr_name, "%s%d", ifp->if_name, ifp->if_unit);
        !           588:     *((struct sockaddr_in *)&ifr.ifr_addr) = blank_sin;
        !           589:     error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ifr, procp);
        !           590:     if (error) {
        !           591:        dprintf(("bootp: SIOCSIFADDR all-zeroes IP failed: %d\n",
        !           592:                 error));
        !           593:        goto cleanup;
        !           594:     }
        !           595:     dprintf(("bootp: all-zeroes IP address assigned\n"));
        !           596:     addr_set = TRUE;
        !           597:     
        !           598:     { /* bind the socket */
        !           599:        struct sockaddr_in * sin;
        !           600: 
        !           601:        sin = _MALLOC(sizeof(struct sockaddr_in), M_IFADDR, M_NOWAIT);
        !           602:        sin->sin_len = sizeof(struct sockaddr_in);
        !           603:        sin->sin_family = AF_INET;
        !           604:        sin->sin_port = htons(IPPORT_BOOTPC);
        !           605:        sin->sin_addr.s_addr = INADDR_ANY;
        !           606:        error = sobind(so, (struct sockaddr *) sin);
        !           607: 
        !           608:        FREE(sin, M_IFADDR);
        !           609:        if (error) {
        !           610:            dprintf(("bootp: sobind failed, %d\n", error));
        !           611:            goto cleanup;
        !           612:        }
        !           613:        so->so_state |= SS_NBIO;
        !           614:     }
        !           615:     /* do the protocol */
        !           616:     error = bootp_loop(so, ifp, max_try, iaddr_p, netmask_p, router_p);
        !           617:     
        !           618:  cleanup:
        !           619:     if (so) {
        !           620:        if (addr_set) {
        !           621:            (void) ifioctl(so, SIOCDIFADDR, (caddr_t) &ifr, procp);
        !           622:        }
        !           623:        soclose(so);
        !           624:     }
        !           625:     return (error);
        !           626: }
        !           627: 
        !           628: /*
        !           629:  * Function: in_bootp
        !           630:  * Purpose: 
        !           631:  *   This is deprecated API.  Once SIOCAUTOADDR is eliminated from
        !           632:  *   the system (IOEthernet class as well), this routine can be removed.
        !           633:  */
        !           634: int
        !           635: in_bootp(struct ifnet * ifp, struct sockaddr_in * sin, u_char my_enaddr[6])
        !           636: {
        !           637:     return (EOPNOTSUPP);
        !           638: }

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