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Annotation of src/sys/netinet/ip_input.c, Revision 1.81

1.81    ! proff       1: /*     $NetBSD: ip_input.c,v 1.80 1999/01/19 23:39:57 mycroft Exp $    */
1.76      thorpej     2:
                      3: /*-
                      4:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                      5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Public Access Networks Corporation ("Panix").  It was developed under
                      9:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *     This product includes software developed by the NetBSD
                     22:  *     Foundation, Inc. and its contributors.
                     23:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     24:  *    contributors may be used to endorse or promote products derived
                     25:  *    from this software without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     28:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     29:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     30:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     31:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     32:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     33:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     34:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     35:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     36:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     37:  * POSSIBILITY OF SUCH DAMAGE.
                     38:  */
1.14      cgd        39:
1.1       cgd        40: /*
1.13      mycroft    41:  * Copyright (c) 1982, 1986, 1988, 1993
                     42:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        43:  *
                     44:  * Redistribution and use in source and binary forms, with or without
                     45:  * modification, are permitted provided that the following conditions
                     46:  * are met:
                     47:  * 1. Redistributions of source code must retain the above copyright
                     48:  *    notice, this list of conditions and the following disclaimer.
                     49:  * 2. Redistributions in binary form must reproduce the above copyright
                     50:  *    notice, this list of conditions and the following disclaimer in the
                     51:  *    documentation and/or other materials provided with the distribution.
                     52:  * 3. All advertising materials mentioning features or use of this software
                     53:  *    must display the following acknowledgement:
                     54:  *     This product includes software developed by the University of
                     55:  *     California, Berkeley and its contributors.
                     56:  * 4. Neither the name of the University nor the names of its contributors
                     57:  *    may be used to endorse or promote products derived from this software
                     58:  *    without specific prior written permission.
                     59:  *
                     60:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     61:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     62:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     63:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     64:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     65:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     66:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     67:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     68:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     69:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     70:  * SUCH DAMAGE.
                     71:  *
1.14      cgd        72:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        73:  */
1.55      scottr     74:
1.62      matt       75: #include "opt_gateway.h"
1.69      mrg        76: #include "opt_pfil_hooks.h"
1.55      scottr     77: #include "opt_mrouting.h"
1.1       cgd        78:
1.5       mycroft    79: #include <sys/param.h>
                     80: #include <sys/systm.h>
                     81: #include <sys/malloc.h>
                     82: #include <sys/mbuf.h>
                     83: #include <sys/domain.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
1.44      thorpej    86: #include <sys/socketvar.h>
1.5       mycroft    87: #include <sys/errno.h>
                     88: #include <sys/time.h>
                     89: #include <sys/kernel.h>
1.28      christos   90: #include <sys/proc.h>
1.72      thorpej    91: #include <sys/pool.h>
1.28      christos   92:
                     93: #include <vm/vm.h>
                     94: #include <sys/sysctl.h>
1.1       cgd        95:
1.5       mycroft    96: #include <net/if.h>
1.44      thorpej    97: #include <net/if_dl.h>
1.5       mycroft    98: #include <net/route.h>
1.45      mrg        99: #include <net/pfil.h>
1.1       cgd       100:
1.5       mycroft   101: #include <netinet/in.h>
                    102: #include <netinet/in_systm.h>
                    103: #include <netinet/ip.h>
                    104: #include <netinet/in_pcb.h>
                    105: #include <netinet/in_var.h>
                    106: #include <netinet/ip_var.h>
                    107: #include <netinet/ip_icmp.h>
1.44      thorpej   108:
1.1       cgd       109: #ifndef        IPFORWARDING
                    110: #ifdef GATEWAY
                    111: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    112: #else /* GATEWAY */
                    113: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    114: #endif /* GATEWAY */
                    115: #endif /* IPFORWARDING */
                    116: #ifndef        IPSENDREDIRECTS
                    117: #define        IPSENDREDIRECTS 1
                    118: #endif
1.26      thorpej   119: #ifndef IPFORWSRCRT
1.47      cjs       120: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    121: #endif
                    122: #ifndef IPALLOWSRCRT
1.48      mrg       123: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   124: #endif
1.53      kml       125: #ifndef IPMTUDISC
                    126: #define IPMTUDISC      0
                    127: #endif
1.60      kml       128: #ifndef IPMTUDISCTIMEOUT
1.61      kml       129: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       130: #endif
1.53      kml       131:
1.27      thorpej   132: /*
                    133:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    134:  * configuration using this option will Just Work.
                    135:  */
                    136: #ifndef IPDIRECTEDBCAST
                    137: #ifdef DIRECTED_BROADCAST
                    138: #define IPDIRECTEDBCAST        1
                    139: #else
                    140: #define        IPDIRECTEDBCAST 0
                    141: #endif /* DIRECTED_BROADCAST */
                    142: #endif /* IPDIRECTEDBCAST */
1.1       cgd       143: int    ipforwarding = IPFORWARDING;
                    144: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   145: int    ip_defttl = IPDEFTTL;
1.26      thorpej   146: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   147: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       148: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       149: int    ip_mtudisc = IPMTUDISC;
1.60      kml       150: u_int  ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       151: #ifdef DIAGNOSTIC
                    152: int    ipprintfs = 0;
                    153: #endif
                    154:
1.60      kml       155: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    156:
1.1       cgd       157: extern struct domain inetdomain;
                    158: extern struct protosw inetsw[];
                    159: u_char ip_protox[IPPROTO_MAX];
                    160: int    ipqmaxlen = IFQ_MAXLEN;
1.22      mycroft   161: struct in_ifaddrhead in_ifaddr;
1.57      tls       162: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13      mycroft   163: struct ifqueue ipintrq;
1.63      matt      164: struct ipstat  ipstat;
                    165: u_int16_t      ip_id;
                    166: int    ip_defttl;
1.75      thorpej   167:
1.63      matt      168: struct ipqhead ipq;
1.75      thorpej   169: int    ipq_locked;
                    170:
                    171: static __inline int ipq_lock_try __P((void));
                    172: static __inline void ipq_unlock __P((void));
                    173:
                    174: static __inline int
                    175: ipq_lock_try()
                    176: {
                    177:        int s;
                    178:
                    179:        s = splimp();
                    180:        if (ipq_locked) {
                    181:                splx(s);
                    182:                return (0);
                    183:        }
                    184:        ipq_locked = 1;
                    185:        splx(s);
                    186:        return (1);
                    187: }
                    188:
                    189: static __inline void
                    190: ipq_unlock()
                    191: {
                    192:        int s;
                    193:
                    194:        s = splimp();
                    195:        ipq_locked = 0;
                    196:        splx(s);
                    197: }
                    198:
                    199: #ifdef DIAGNOSTIC
                    200: #define        IPQ_LOCK()                                                      \
                    201: do {                                                                   \
                    202:        if (ipq_lock_try() == 0) {                                      \
                    203:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    204:                panic("ipq_lock");                                      \
                    205:        }                                                               \
                    206: } while (0)
                    207: #define        IPQ_LOCK_CHECK()                                                \
                    208: do {                                                                   \
                    209:        if (ipq_locked == 0) {                                          \
                    210:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    211:                panic("ipq lock check");                                \
                    212:        }                                                               \
                    213: } while (0)
                    214: #else
                    215: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    216: #define        IPQ_LOCK_CHECK()        /* nothing */
                    217: #endif
                    218:
                    219: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       220:
1.72      thorpej   221: struct pool ipqent_pool;
                    222:
1.1       cgd       223: /*
                    224:  * We need to save the IP options in case a protocol wants to respond
                    225:  * to an incoming packet over the same route if the packet got here
                    226:  * using IP source routing.  This allows connection establishment and
                    227:  * maintenance when the remote end is on a network that is not known
                    228:  * to us.
                    229:  */
                    230: int    ip_nhops = 0;
                    231: static struct ip_srcrt {
                    232:        struct  in_addr dst;                    /* final destination */
                    233:        char    nop;                            /* one NOP to align */
                    234:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    235:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    236: } ip_srcrt;
                    237:
1.13      mycroft   238: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   239:
1.1       cgd       240: /*
                    241:  * IP initialization: fill in IP protocol switch table.
                    242:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    243:  */
1.8       mycroft   244: void
1.1       cgd       245: ip_init()
                    246: {
                    247:        register struct protosw *pr;
                    248:        register int i;
                    249:
1.72      thorpej   250:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    251:            0, NULL, NULL, M_IPQ);
                    252:
1.1       cgd       253:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    254:        if (pr == 0)
                    255:                panic("ip_init");
                    256:        for (i = 0; i < IPPROTO_MAX; i++)
                    257:                ip_protox[i] = pr - inetsw;
                    258:        for (pr = inetdomain.dom_protosw;
                    259:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    260:                if (pr->pr_domain->dom_family == PF_INET &&
                    261:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    262:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       263:        LIST_INIT(&ipq);
1.1       cgd       264:        ip_id = time.tv_sec & 0xffff;
                    265:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   266:        TAILQ_INIT(&in_ifaddr);
1.57      tls       267:        in_ifaddrhashtbl =
                    268:            hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60      kml       269:        if (ip_mtudisc != 0)
                    270:                ip_mtudisc_timeout_q =
                    271:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   272: #ifdef GATEWAY
                    273:        ipflow_init();
                    274: #endif
1.1       cgd       275: }
                    276:
                    277: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    278: struct route ipforward_rt;
                    279:
                    280: /*
                    281:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    282:  * try to reassemble.  Process options.  Pass to next level.
                    283:  */
1.8       mycroft   284: void
1.1       cgd       285: ipintr()
                    286: {
1.33      mrg       287:        register struct ip *ip = NULL;
1.1       cgd       288:        register struct mbuf *m;
                    289:        register struct ipq *fp;
                    290:        register struct in_ifaddr *ia;
1.57      tls       291:        register struct ifaddr *ifa;
1.25      cgd       292:        struct ipqent *ipqe;
1.35      mycroft   293:        int hlen = 0, mff, len, s;
1.36      mrg       294: #ifdef PFIL_HOOKS
1.33      mrg       295:        struct packet_filter_hook *pfh;
                    296:        struct mbuf *m0;
1.43      mrg       297:        int rv;
1.36      mrg       298: #endif /* PFIL_HOOKS */
1.1       cgd       299:
                    300: next:
                    301:        /*
                    302:         * Get next datagram off input queue and get IP header
                    303:         * in first mbuf.
                    304:         */
                    305:        s = splimp();
                    306:        IF_DEQUEUE(&ipintrq, m);
                    307:        splx(s);
1.13      mycroft   308:        if (m == 0)
1.1       cgd       309:                return;
                    310: #ifdef DIAGNOSTIC
                    311:        if ((m->m_flags & M_PKTHDR) == 0)
                    312:                panic("ipintr no HDR");
                    313: #endif
                    314:        /*
                    315:         * If no IP addresses have been set yet but the interfaces
                    316:         * are receiving, can't do anything with incoming packets yet.
                    317:         */
1.22      mycroft   318:        if (in_ifaddr.tqh_first == 0)
1.1       cgd       319:                goto bad;
                    320:        ipstat.ips_total++;
                    321:        if (m->m_len < sizeof (struct ip) &&
                    322:            (m = m_pullup(m, sizeof (struct ip))) == 0) {
                    323:                ipstat.ips_toosmall++;
                    324:                goto next;
                    325:        }
                    326:        ip = mtod(m, struct ip *);
1.13      mycroft   327:        if (ip->ip_v != IPVERSION) {
                    328:                ipstat.ips_badvers++;
                    329:                goto bad;
                    330:        }
1.1       cgd       331:        hlen = ip->ip_hl << 2;
                    332:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    333:                ipstat.ips_badhlen++;
                    334:                goto bad;
                    335:        }
                    336:        if (hlen > m->m_len) {
                    337:                if ((m = m_pullup(m, hlen)) == 0) {
                    338:                        ipstat.ips_badhlen++;
                    339:                        goto next;
                    340:                }
                    341:                ip = mtod(m, struct ip *);
                    342:        }
1.78      mycroft   343:        if (in_cksum(m, hlen) != 0) {
1.1       cgd       344:                ipstat.ips_badsum++;
                    345:                goto bad;
                    346:        }
                    347:
                    348:        /*
                    349:         * Convert fields to host representation.
                    350:         */
                    351:        NTOHS(ip->ip_len);
                    352:        NTOHS(ip->ip_off);
1.35      mycroft   353:        len = ip->ip_len;
1.81    ! proff     354:
        !           355:        /*
        !           356:         * Check for additional length bogosity
        !           357:         */
        !           358:        if (len < hlen)
        !           359:        {
        !           360:                ipstat.ips_badlen++;
        !           361:                goto bad;
        !           362:        }
1.1       cgd       363:
                    364:        /*
                    365:         * Check that the amount of data in the buffers
                    366:         * is as at least much as the IP header would have us expect.
                    367:         * Trim mbufs if longer than we expect.
                    368:         * Drop packet if shorter than we expect.
                    369:         */
1.35      mycroft   370:        if (m->m_pkthdr.len < len) {
1.1       cgd       371:                ipstat.ips_tooshort++;
                    372:                goto bad;
                    373:        }
1.35      mycroft   374:        if (m->m_pkthdr.len > len) {
1.1       cgd       375:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   376:                        m->m_len = len;
                    377:                        m->m_pkthdr.len = len;
1.1       cgd       378:                } else
1.35      mycroft   379:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       380:        }
                    381:
1.64      thorpej   382:        /*
                    383:         * Assume that we can create a fast-forward IP flow entry
                    384:         * based on this packet.
                    385:         */
                    386:        m->m_flags |= M_CANFASTFWD;
                    387:
1.36      mrg       388: #ifdef PFIL_HOOKS
1.33      mrg       389:        /*
1.64      thorpej   390:         * Run through list of hooks for input packets.  If there are any
                    391:         * filters which require that additional packets in the flow are
                    392:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    393:         * Note that filters must _never_ set this flag, as another filter
                    394:         * in the list may have previously cleared it.
1.33      mrg       395:         */
                    396:        m0 = m;
1.59      mrg       397:        for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next)
1.33      mrg       398:                if (pfh->pfil_func) {
1.43      mrg       399:                        rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
                    400:                        if (rv)
1.40      veego     401:                                goto next;
1.68      sommerfe  402:                        m = m0;
                    403:                        if (m == NULL)
                    404:                                goto next;
                    405:                        ip = mtod(m, struct ip *);
1.33      mrg       406:                }
1.36      mrg       407: #endif /* PFIL_HOOKS */
1.33      mrg       408:
1.1       cgd       409:        /*
                    410:         * Process options and, if not destined for us,
                    411:         * ship it on.  ip_dooptions returns 1 when an
                    412:         * error was detected (causing an icmp message
                    413:         * to be sent and the original packet to be freed).
                    414:         */
                    415:        ip_nhops = 0;           /* for source routed packets */
                    416:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
                    417:                goto next;
                    418:
                    419:        /*
                    420:         * Check our list of addresses, to see if the packet is for us.
                    421:         */
1.57      tls       422:        INADDR_TO_IA(ip->ip_dst, ia);
                    423:        if (ia != NULL) goto ours;
                    424:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
                    425:                for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    426:                    ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
                    427:                        if (ifa->ifa_addr->sa_family != AF_INET) continue;
                    428:                        ia = ifatoia(ifa);
1.35      mycroft   429:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    430:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   431:                            /*
                    432:                             * Look for all-0's host part (old broadcast addr),
                    433:                             * either for subnet or net.
                    434:                             */
                    435:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   436:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       437:                                goto ours;
1.57      tls       438:                        /*
                    439:                         * An interface with IP address zero accepts
                    440:                         * all packets that arrive on that interface.
                    441:                         */
                    442:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    443:                                goto ours;
1.1       cgd       444:                }
                    445:        }
1.18      mycroft   446:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   447:                struct in_multi *inm;
                    448: #ifdef MROUTING
                    449:                extern struct socket *ip_mrouter;
1.10      brezak    450:
                    451:                if (m->m_flags & M_EXT) {
                    452:                        if ((m = m_pullup(m, hlen)) == 0) {
                    453:                                ipstat.ips_toosmall++;
                    454:                                goto next;
                    455:                        }
                    456:                        ip = mtod(m, struct ip *);
                    457:                }
1.4       hpeyerl   458:
                    459:                if (ip_mrouter) {
                    460:                        /*
                    461:                         * If we are acting as a multicast router, all
                    462:                         * incoming multicast packets are passed to the
                    463:                         * kernel-level multicast forwarding function.
                    464:                         * The packet is returned (relatively) intact; if
                    465:                         * ip_mforward() returns a non-zero value, the packet
                    466:                         * must be discarded, else it may be accepted below.
                    467:                         *
                    468:                         * (The IP ident field is put in the same byte order
                    469:                         * as expected when ip_mforward() is called from
                    470:                         * ip_output().)
                    471:                         */
1.13      mycroft   472:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    473:                                ipstat.ips_cantforward++;
1.4       hpeyerl   474:                                m_freem(m);
                    475:                                goto next;
                    476:                        }
                    477:
                    478:                        /*
                    479:                         * The process-level routing demon needs to receive
                    480:                         * all multicast IGMP packets, whether or not this
                    481:                         * host belongs to their destination groups.
                    482:                         */
                    483:                        if (ip->ip_p == IPPROTO_IGMP)
                    484:                                goto ours;
1.13      mycroft   485:                        ipstat.ips_forward++;
1.4       hpeyerl   486:                }
                    487: #endif
                    488:                /*
                    489:                 * See if we belong to the destination multicast group on the
                    490:                 * arrival interface.
                    491:                 */
                    492:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    493:                if (inm == NULL) {
1.13      mycroft   494:                        ipstat.ips_cantforward++;
1.4       hpeyerl   495:                        m_freem(m);
                    496:                        goto next;
                    497:                }
                    498:                goto ours;
                    499:        }
1.19      mycroft   500:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   501:            in_nullhost(ip->ip_dst))
1.1       cgd       502:                goto ours;
                    503:
                    504:        /*
                    505:         * Not for us; forward if possible and desirable.
                    506:         */
                    507:        if (ipforwarding == 0) {
                    508:                ipstat.ips_cantforward++;
                    509:                m_freem(m);
                    510:        } else
                    511:                ip_forward(m, 0);
                    512:        goto next;
                    513:
                    514: ours:
                    515:        /*
                    516:         * If offset or IP_MF are set, must reassemble.
                    517:         * Otherwise, nothing need be done.
                    518:         * (We could look in the reassembly queue to see
                    519:         * if the packet was previously fragmented,
                    520:         * but it's not worth the time; just let them time out.)
                    521:         */
1.37      perry     522:        if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1       cgd       523:                /*
                    524:                 * Look for queue of fragments
                    525:                 * of this datagram.
                    526:                 */
1.75      thorpej   527:                IPQ_LOCK();
1.25      cgd       528:                for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1       cgd       529:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   530:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    531:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       532:                            ip->ip_p == fp->ipq_p)
                    533:                                goto found;
                    534:                fp = 0;
                    535: found:
                    536:
                    537:                /*
                    538:                 * Adjust ip_len to not reflect header,
1.25      cgd       539:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       540:                 * convert offset of this to bytes.
                    541:                 */
                    542:                ip->ip_len -= hlen;
1.25      cgd       543:                mff = (ip->ip_off & IP_MF) != 0;
                    544:                if (mff) {
1.16      cgd       545:                        /*
                    546:                         * Make sure that fragments have a data length
                    547:                         * that's a non-zero multiple of 8 bytes.
                    548:                         */
1.17      cgd       549:                        if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16      cgd       550:                                ipstat.ips_badfrags++;
1.75      thorpej   551:                                IPQ_UNLOCK();
1.16      cgd       552:                                goto bad;
                    553:                        }
                    554:                }
1.1       cgd       555:                ip->ip_off <<= 3;
                    556:
                    557:                /*
                    558:                 * If datagram marked as having more fragments
                    559:                 * or if this is not the first fragment,
                    560:                 * attempt reassembly; if it succeeds, proceed.
                    561:                 */
1.25      cgd       562:                if (mff || ip->ip_off) {
1.1       cgd       563:                        ipstat.ips_fragments++;
1.72      thorpej   564:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       565:                        if (ipqe == NULL) {
                    566:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   567:                                IPQ_UNLOCK();
1.25      cgd       568:                                goto bad;
                    569:                        }
                    570:                        ipqe->ipqe_mff = mff;
1.50      thorpej   571:                        ipqe->ipqe_m = m;
1.25      cgd       572:                        ipqe->ipqe_ip = ip;
1.50      thorpej   573:                        m = ip_reass(ipqe, fp);
1.75      thorpej   574:                        if (m == 0) {
                    575:                                IPQ_UNLOCK();
1.1       cgd       576:                                goto next;
1.75      thorpej   577:                        }
1.13      mycroft   578:                        ipstat.ips_reassembled++;
1.50      thorpej   579:                        ip = mtod(m, struct ip *);
1.74      thorpej   580:                        hlen = ip->ip_hl << 2;
1.79      mycroft   581:                        ip->ip_len += hlen;
1.1       cgd       582:                } else
                    583:                        if (fp)
                    584:                                ip_freef(fp);
1.75      thorpej   585:                IPQ_UNLOCK();
1.79      mycroft   586:        }
1.1       cgd       587:
                    588:        /*
                    589:         * Switch out to protocol's input routine.
                    590:         */
                    591:        ipstat.ips_delivered++;
                    592:        (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
                    593:        goto next;
                    594: bad:
                    595:        m_freem(m);
                    596:        goto next;
                    597: }
                    598:
                    599: /*
                    600:  * Take incoming datagram fragment and try to
                    601:  * reassemble it into whole datagram.  If a chain for
                    602:  * reassembly of this datagram already exists, then it
                    603:  * is given as fp; otherwise have to make a chain.
                    604:  */
1.50      thorpej   605: struct mbuf *
1.25      cgd       606: ip_reass(ipqe, fp)
                    607:        register struct ipqent *ipqe;
1.1       cgd       608:        register struct ipq *fp;
                    609: {
1.50      thorpej   610:        register struct mbuf *m = ipqe->ipqe_m;
1.25      cgd       611:        register struct ipqent *nq, *p, *q;
                    612:        struct ip *ip;
1.1       cgd       613:        struct mbuf *t;
1.25      cgd       614:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       615:        int i, next;
                    616:
1.75      thorpej   617:        IPQ_LOCK_CHECK();
                    618:
1.1       cgd       619:        /*
                    620:         * Presence of header sizes in mbufs
                    621:         * would confuse code below.
                    622:         */
                    623:        m->m_data += hlen;
                    624:        m->m_len -= hlen;
                    625:
                    626:        /*
                    627:         * If first fragment to arrive, create a reassembly queue.
                    628:         */
                    629:        if (fp == 0) {
1.50      thorpej   630:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    631:                    M_FTABLE, M_NOWAIT);
                    632:                if (fp == NULL)
1.1       cgd       633:                        goto dropfrag;
1.25      cgd       634:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       635:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       636:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    637:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
                    638:                LIST_INIT(&fp->ipq_fragq);
                    639:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    640:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    641:                p = NULL;
1.1       cgd       642:                goto insert;
                    643:        }
                    644:
                    645:        /*
                    646:         * Find a segment which begins after this one does.
                    647:         */
1.25      cgd       648:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    649:            p = q, q = q->ipqe_q.le_next)
                    650:                if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1       cgd       651:                        break;
                    652:
                    653:        /*
                    654:         * If there is a preceding segment, it may provide some of
                    655:         * our data already.  If so, drop the data from the incoming
                    656:         * segment.  If it provides all of our data, drop us.
                    657:         */
1.25      cgd       658:        if (p != NULL) {
                    659:                i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
                    660:                    ipqe->ipqe_ip->ip_off;
1.1       cgd       661:                if (i > 0) {
1.25      cgd       662:                        if (i >= ipqe->ipqe_ip->ip_len)
1.1       cgd       663:                                goto dropfrag;
1.50      thorpej   664:                        m_adj(ipqe->ipqe_m, i);
1.25      cgd       665:                        ipqe->ipqe_ip->ip_off += i;
                    666:                        ipqe->ipqe_ip->ip_len -= i;
1.1       cgd       667:                }
                    668:        }
                    669:
                    670:        /*
                    671:         * While we overlap succeeding segments trim them or,
                    672:         * if they are completely covered, dequeue them.
                    673:         */
1.25      cgd       674:        for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
                    675:            q->ipqe_ip->ip_off; q = nq) {
                    676:                i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
                    677:                    q->ipqe_ip->ip_off;
                    678:                if (i < q->ipqe_ip->ip_len) {
                    679:                        q->ipqe_ip->ip_len -= i;
                    680:                        q->ipqe_ip->ip_off += i;
1.50      thorpej   681:                        m_adj(q->ipqe_m, i);
1.1       cgd       682:                        break;
                    683:                }
1.25      cgd       684:                nq = q->ipqe_q.le_next;
1.50      thorpej   685:                m_freem(q->ipqe_m);
1.25      cgd       686:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   687:                pool_put(&ipqent_pool, q);
1.1       cgd       688:        }
                    689:
                    690: insert:
                    691:        /*
                    692:         * Stick new segment in its place;
                    693:         * check for complete reassembly.
                    694:         */
1.25      cgd       695:        if (p == NULL) {
                    696:                LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
                    697:        } else {
                    698:                LIST_INSERT_AFTER(p, ipqe, ipqe_q);
                    699:        }
1.1       cgd       700:        next = 0;
1.25      cgd       701:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    702:            p = q, q = q->ipqe_q.le_next) {
                    703:                if (q->ipqe_ip->ip_off != next)
1.1       cgd       704:                        return (0);
1.25      cgd       705:                next += q->ipqe_ip->ip_len;
1.1       cgd       706:        }
1.25      cgd       707:        if (p->ipqe_mff)
1.1       cgd       708:                return (0);
                    709:
                    710:        /*
1.41      thorpej   711:         * Reassembly is complete.  Check for a bogus message size and
                    712:         * concatenate fragments.
1.1       cgd       713:         */
1.25      cgd       714:        q = fp->ipq_fragq.lh_first;
                    715:        ip = q->ipqe_ip;
1.41      thorpej   716:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    717:                ipstat.ips_toolong++;
                    718:                ip_freef(fp);
                    719:                return (0);
                    720:        }
1.50      thorpej   721:        m = q->ipqe_m;
1.1       cgd       722:        t = m->m_next;
                    723:        m->m_next = 0;
                    724:        m_cat(m, t);
1.25      cgd       725:        nq = q->ipqe_q.le_next;
1.72      thorpej   726:        pool_put(&ipqent_pool, q);
1.25      cgd       727:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   728:                t = q->ipqe_m;
1.25      cgd       729:                nq = q->ipqe_q.le_next;
1.72      thorpej   730:                pool_put(&ipqent_pool, q);
1.1       cgd       731:                m_cat(m, t);
                    732:        }
                    733:
                    734:        /*
                    735:         * Create header for new ip packet by
                    736:         * modifying header of first packet;
                    737:         * dequeue and discard fragment reassembly header.
                    738:         * Make header visible.
                    739:         */
                    740:        ip->ip_len = next;
1.25      cgd       741:        ip->ip_src = fp->ipq_src;
                    742:        ip->ip_dst = fp->ipq_dst;
                    743:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   744:        FREE(fp, M_FTABLE);
1.1       cgd       745:        m->m_len += (ip->ip_hl << 2);
                    746:        m->m_data -= (ip->ip_hl << 2);
                    747:        /* some debugging cruft by sklower, below, will go away soon */
                    748:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
                    749:                register int plen = 0;
1.50      thorpej   750:                for (t = m; t; t = t->m_next)
                    751:                        plen += t->m_len;
                    752:                m->m_pkthdr.len = plen;
1.1       cgd       753:        }
1.50      thorpej   754:        return (m);
1.1       cgd       755:
                    756: dropfrag:
                    757:        ipstat.ips_fragdropped++;
                    758:        m_freem(m);
1.72      thorpej   759:        pool_put(&ipqent_pool, ipqe);
1.1       cgd       760:        return (0);
                    761: }
                    762:
                    763: /*
                    764:  * Free a fragment reassembly header and all
                    765:  * associated datagrams.
                    766:  */
1.8       mycroft   767: void
1.1       cgd       768: ip_freef(fp)
                    769:        struct ipq *fp;
                    770: {
1.25      cgd       771:        register struct ipqent *q, *p;
1.1       cgd       772:
1.75      thorpej   773:        IPQ_LOCK_CHECK();
                    774:
1.25      cgd       775:        for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
                    776:                p = q->ipqe_q.le_next;
1.50      thorpej   777:                m_freem(q->ipqe_m);
1.25      cgd       778:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   779:                pool_put(&ipqent_pool, q);
1.1       cgd       780:        }
1.25      cgd       781:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   782:        FREE(fp, M_FTABLE);
1.1       cgd       783: }
                    784:
                    785: /*
                    786:  * IP timer processing;
                    787:  * if a timer expires on a reassembly
                    788:  * queue, discard it.
                    789:  */
1.8       mycroft   790: void
1.1       cgd       791: ip_slowtimo()
                    792: {
1.25      cgd       793:        register struct ipq *fp, *nfp;
1.24      mycroft   794:        int s = splsoftnet();
1.1       cgd       795:
1.75      thorpej   796:        IPQ_LOCK();
1.25      cgd       797:        for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
                    798:                nfp = fp->ipq_q.le_next;
                    799:                if (--fp->ipq_ttl == 0) {
1.1       cgd       800:                        ipstat.ips_fragtimeout++;
1.25      cgd       801:                        ip_freef(fp);
1.1       cgd       802:                }
                    803:        }
1.75      thorpej   804:        IPQ_UNLOCK();
1.63      matt      805: #ifdef GATEWAY
                    806:        ipflow_slowtimo();
                    807: #endif
1.1       cgd       808:        splx(s);
                    809: }
                    810:
                    811: /*
                    812:  * Drain off all datagram fragments.
                    813:  */
1.8       mycroft   814: void
1.1       cgd       815: ip_drain()
                    816: {
                    817:
1.75      thorpej   818:        /*
                    819:         * We may be called from a device's interrupt context.  If
                    820:         * the ipq is already busy, just bail out now.
                    821:         */
                    822:        if (ipq_lock_try() == 0)
                    823:                return;
                    824:
1.25      cgd       825:        while (ipq.lh_first != NULL) {
1.1       cgd       826:                ipstat.ips_fragdropped++;
1.25      cgd       827:                ip_freef(ipq.lh_first);
1.1       cgd       828:        }
1.75      thorpej   829:
                    830:        IPQ_UNLOCK();
1.1       cgd       831: }
                    832:
                    833: /*
                    834:  * Do option processing on a datagram,
                    835:  * possibly discarding it if bad options are encountered,
                    836:  * or forwarding it if source-routed.
                    837:  * Returns 1 if packet has been forwarded/freed,
                    838:  * 0 if the packet should be processed further.
                    839:  */
1.8       mycroft   840: int
1.1       cgd       841: ip_dooptions(m)
                    842:        struct mbuf *m;
                    843: {
                    844:        register struct ip *ip = mtod(m, struct ip *);
                    845:        register u_char *cp;
                    846:        register struct ip_timestamp *ipt;
                    847:        register struct in_ifaddr *ia;
                    848:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13      mycroft   849:        struct in_addr *sin, dst;
1.1       cgd       850:        n_time ntime;
                    851:
1.13      mycroft   852:        dst = ip->ip_dst;
1.1       cgd       853:        cp = (u_char *)(ip + 1);
                    854:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    855:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    856:                opt = cp[IPOPT_OPTVAL];
                    857:                if (opt == IPOPT_EOL)
                    858:                        break;
                    859:                if (opt == IPOPT_NOP)
                    860:                        optlen = 1;
                    861:                else {
                    862:                        optlen = cp[IPOPT_OLEN];
                    863:                        if (optlen <= 0 || optlen > cnt) {
                    864:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    865:                                goto bad;
                    866:                        }
                    867:                }
                    868:                switch (opt) {
                    869:
                    870:                default:
                    871:                        break;
                    872:
                    873:                /*
                    874:                 * Source routing with record.
                    875:                 * Find interface with current destination address.
                    876:                 * If none on this machine then drop if strictly routed,
                    877:                 * or do nothing if loosely routed.
                    878:                 * Record interface address and bring up next address
                    879:                 * component.  If strictly routed make sure next
                    880:                 * address is on directly accessible net.
                    881:                 */
                    882:                case IPOPT_LSRR:
                    883:                case IPOPT_SSRR:
1.47      cjs       884:                        if (ip_allowsrcrt == 0) {
                    885:                                type = ICMP_UNREACH;
                    886:                                code = ICMP_UNREACH_NET_PROHIB;
                    887:                                goto bad;
                    888:                        }
1.1       cgd       889:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    890:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    891:                                goto bad;
                    892:                        }
                    893:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   894:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       895:                        if (ia == 0) {
                    896:                                if (opt == IPOPT_SSRR) {
                    897:                                        type = ICMP_UNREACH;
                    898:                                        code = ICMP_UNREACH_SRCFAIL;
                    899:                                        goto bad;
                    900:                                }
                    901:                                /*
                    902:                                 * Loose routing, and not at next destination
                    903:                                 * yet; nothing to do except forward.
                    904:                                 */
                    905:                                break;
                    906:                        }
                    907:                        off--;                  /* 0 origin */
                    908:                        if (off > optlen - sizeof(struct in_addr)) {
                    909:                                /*
                    910:                                 * End of source route.  Should be for us.
                    911:                                 */
                    912:                                save_rte(cp, ip->ip_src);
                    913:                                break;
                    914:                        }
                    915:                        /*
                    916:                         * locate outgoing interface
                    917:                         */
                    918:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                    919:                            sizeof(ipaddr.sin_addr));
                    920:                        if (opt == IPOPT_SSRR) {
                    921: #define        INA     struct in_ifaddr *
                    922: #define        SA      struct sockaddr *
1.29      mrg       923:                            ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1       cgd       924:                        } else
                    925:                                ia = ip_rtaddr(ipaddr.sin_addr);
                    926:                        if (ia == 0) {
                    927:                                type = ICMP_UNREACH;
                    928:                                code = ICMP_UNREACH_SRCFAIL;
                    929:                                goto bad;
                    930:                        }
                    931:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft   932:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd       933:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                    934:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   935:                        /*
                    936:                         * Let ip_intr's mcast routing check handle mcast pkts
                    937:                         */
1.18      mycroft   938:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       939:                        break;
                    940:
                    941:                case IPOPT_RR:
                    942:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    943:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    944:                                goto bad;
                    945:                        }
                    946:                        /*
                    947:                         * If no space remains, ignore.
                    948:                         */
                    949:                        off--;                  /* 0 origin */
                    950:                        if (off > optlen - sizeof(struct in_addr))
                    951:                                break;
                    952:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                    953:                            sizeof(ipaddr.sin_addr));
                    954:                        /*
                    955:                         * locate outgoing interface; if we're the destination,
                    956:                         * use the incoming interface (should be same).
                    957:                         */
                    958:                        if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
                    959:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
                    960:                                type = ICMP_UNREACH;
                    961:                                code = ICMP_UNREACH_HOST;
                    962:                                goto bad;
                    963:                        }
1.20      mycroft   964:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd       965:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                    966:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                    967:                        break;
                    968:
                    969:                case IPOPT_TS:
                    970:                        code = cp - (u_char *)ip;
                    971:                        ipt = (struct ip_timestamp *)cp;
                    972:                        if (ipt->ipt_len < 5)
                    973:                                goto bad;
1.15      cgd       974:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1       cgd       975:                                if (++ipt->ipt_oflw == 0)
                    976:                                        goto bad;
                    977:                                break;
                    978:                        }
                    979:                        sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
                    980:                        switch (ipt->ipt_flg) {
                    981:
                    982:                        case IPOPT_TS_TSONLY:
                    983:                                break;
                    984:
                    985:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej   986:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd       987:                                    sizeof(struct in_addr) > ipt->ipt_len)
                    988:                                        goto bad;
1.13      mycroft   989:                                ipaddr.sin_addr = dst;
                    990:                                ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
                    991:                                                            m->m_pkthdr.rcvif);
                    992:                                if (ia == 0)
                    993:                                        continue;
1.20      mycroft   994:                                bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd       995:                                    (caddr_t)sin, sizeof(struct in_addr));
                    996:                                ipt->ipt_ptr += sizeof(struct in_addr);
                    997:                                break;
                    998:
                    999:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1000:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1001:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1002:                                        goto bad;
                   1003:                                bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
                   1004:                                    sizeof(struct in_addr));
                   1005:                                if (ifa_ifwithaddr((SA)&ipaddr) == 0)
                   1006:                                        continue;
                   1007:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1008:                                break;
                   1009:
                   1010:                        default:
                   1011:                                goto bad;
                   1012:                        }
                   1013:                        ntime = iptime();
                   1014:                        bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
                   1015:                            sizeof(n_time));
                   1016:                        ipt->ipt_ptr += sizeof(n_time);
                   1017:                }
                   1018:        }
                   1019:        if (forward) {
1.26      thorpej  1020:                if (ip_forwsrcrt == 0) {
                   1021:                        type = ICMP_UNREACH;
                   1022:                        code = ICMP_UNREACH_SRCFAIL;
                   1023:                        goto bad;
                   1024:                }
1.1       cgd      1025:                ip_forward(m, 1);
                   1026:                return (1);
1.13      mycroft  1027:        }
                   1028:        return (0);
1.1       cgd      1029: bad:
1.13      mycroft  1030:        icmp_error(m, type, code, 0, 0);
                   1031:        ipstat.ips_badoptions++;
1.1       cgd      1032:        return (1);
                   1033: }
                   1034:
                   1035: /*
                   1036:  * Given address of next destination (final or next hop),
                   1037:  * return internet address info of interface to be used to get there.
                   1038:  */
                   1039: struct in_ifaddr *
                   1040: ip_rtaddr(dst)
                   1041:         struct in_addr dst;
                   1042: {
                   1043:        register struct sockaddr_in *sin;
                   1044:
1.19      mycroft  1045:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1046:
1.35      mycroft  1047:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1048:                if (ipforward_rt.ro_rt) {
                   1049:                        RTFREE(ipforward_rt.ro_rt);
                   1050:                        ipforward_rt.ro_rt = 0;
                   1051:                }
                   1052:                sin->sin_family = AF_INET;
                   1053:                sin->sin_len = sizeof(*sin);
                   1054:                sin->sin_addr = dst;
                   1055:
                   1056:                rtalloc(&ipforward_rt);
                   1057:        }
                   1058:        if (ipforward_rt.ro_rt == 0)
                   1059:                return ((struct in_ifaddr *)0);
1.19      mycroft  1060:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1061: }
                   1062:
                   1063: /*
                   1064:  * Save incoming source route for use in replies,
                   1065:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1066:  */
1.13      mycroft  1067: void
1.1       cgd      1068: save_rte(option, dst)
                   1069:        u_char *option;
                   1070:        struct in_addr dst;
                   1071: {
                   1072:        unsigned olen;
                   1073:
                   1074:        olen = option[IPOPT_OLEN];
                   1075: #ifdef DIAGNOSTIC
                   1076:        if (ipprintfs)
1.39      christos 1077:                printf("save_rte: olen %d\n", olen);
1.1       cgd      1078: #endif
                   1079:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1080:                return;
                   1081:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1082:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1083:        ip_srcrt.dst = dst;
                   1084: }
                   1085:
                   1086: /*
                   1087:  * Retrieve incoming source route for use in replies,
                   1088:  * in the same form used by setsockopt.
                   1089:  * The first hop is placed before the options, will be removed later.
                   1090:  */
                   1091: struct mbuf *
                   1092: ip_srcroute()
                   1093: {
                   1094:        register struct in_addr *p, *q;
                   1095:        register struct mbuf *m;
                   1096:
                   1097:        if (ip_nhops == 0)
                   1098:                return ((struct mbuf *)0);
                   1099:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1100:        if (m == 0)
                   1101:                return ((struct mbuf *)0);
                   1102:
1.13      mycroft  1103: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1104:
                   1105:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1106:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1107:            OPTSIZ;
                   1108: #ifdef DIAGNOSTIC
                   1109:        if (ipprintfs)
1.39      christos 1110:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1111: #endif
                   1112:
                   1113:        /*
                   1114:         * First save first hop for return route
                   1115:         */
                   1116:        p = &ip_srcrt.route[ip_nhops - 1];
                   1117:        *(mtod(m, struct in_addr *)) = *p--;
                   1118: #ifdef DIAGNOSTIC
                   1119:        if (ipprintfs)
1.39      christos 1120:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1121: #endif
                   1122:
                   1123:        /*
                   1124:         * Copy option fields and padding (nop) to mbuf.
                   1125:         */
                   1126:        ip_srcrt.nop = IPOPT_NOP;
                   1127:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1128:        bcopy((caddr_t)&ip_srcrt.nop,
                   1129:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1130:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1131:            sizeof(struct in_addr) + OPTSIZ);
                   1132: #undef OPTSIZ
                   1133:        /*
                   1134:         * Record return path as an IP source route,
                   1135:         * reversing the path (pointers are now aligned).
                   1136:         */
                   1137:        while (p >= ip_srcrt.route) {
                   1138: #ifdef DIAGNOSTIC
                   1139:                if (ipprintfs)
1.39      christos 1140:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1141: #endif
                   1142:                *q++ = *p--;
                   1143:        }
                   1144:        /*
                   1145:         * Last hop goes to final destination.
                   1146:         */
                   1147:        *q = ip_srcrt.dst;
                   1148: #ifdef DIAGNOSTIC
                   1149:        if (ipprintfs)
1.39      christos 1150:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1151: #endif
                   1152:        return (m);
                   1153: }
                   1154:
                   1155: /*
                   1156:  * Strip out IP options, at higher
                   1157:  * level protocol in the kernel.
                   1158:  * Second argument is buffer to which options
                   1159:  * will be moved, and return value is their length.
                   1160:  * XXX should be deleted; last arg currently ignored.
                   1161:  */
1.8       mycroft  1162: void
1.1       cgd      1163: ip_stripoptions(m, mopt)
                   1164:        register struct mbuf *m;
                   1165:        struct mbuf *mopt;
                   1166: {
                   1167:        register int i;
                   1168:        struct ip *ip = mtod(m, struct ip *);
                   1169:        register caddr_t opts;
                   1170:        int olen;
                   1171:
1.79      mycroft  1172:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1173:        opts = (caddr_t)(ip + 1);
                   1174:        i = m->m_len - (sizeof (struct ip) + olen);
                   1175:        bcopy(opts  + olen, opts, (unsigned)i);
                   1176:        m->m_len -= olen;
                   1177:        if (m->m_flags & M_PKTHDR)
                   1178:                m->m_pkthdr.len -= olen;
1.79      mycroft  1179:        ip->ip_len -= olen;
                   1180:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1181: }
                   1182:
1.23      mycroft  1183: int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1184:        0,              0,              0,              0,
                   1185:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1186:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1187:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1188:        0,              0,              0,              0,
                   1189:        ENOPROTOOPT
                   1190: };
                   1191:
                   1192: /*
                   1193:  * Forward a packet.  If some error occurs return the sender
                   1194:  * an icmp packet.  Note we can't always generate a meaningful
                   1195:  * icmp message because icmp doesn't have a large enough repertoire
                   1196:  * of codes and types.
                   1197:  *
                   1198:  * If not forwarding, just drop the packet.  This could be confusing
                   1199:  * if ipforwarding was zero but some routing protocol was advancing
                   1200:  * us as a gateway to somewhere.  However, we must let the routing
                   1201:  * protocol deal with that.
                   1202:  *
                   1203:  * The srcrt parameter indicates whether the packet is being forwarded
                   1204:  * via a source route.
                   1205:  */
1.13      mycroft  1206: void
1.1       cgd      1207: ip_forward(m, srcrt)
                   1208:        struct mbuf *m;
                   1209:        int srcrt;
                   1210: {
                   1211:        register struct ip *ip = mtod(m, struct ip *);
                   1212:        register struct sockaddr_in *sin;
                   1213:        register struct rtentry *rt;
1.28      christos 1214:        int error, type = 0, code = 0;
1.1       cgd      1215:        struct mbuf *mcopy;
1.13      mycroft  1216:        n_long dest;
                   1217:        struct ifnet *destifp;
1.1       cgd      1218:
1.13      mycroft  1219:        dest = 0;
1.1       cgd      1220: #ifdef DIAGNOSTIC
                   1221:        if (ipprintfs)
1.70      thorpej  1222:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1223:                    ntohl(ip->ip_src.s_addr),
                   1224:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1225: #endif
                   1226:        if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
                   1227:                ipstat.ips_cantforward++;
                   1228:                m_freem(m);
                   1229:                return;
                   1230:        }
                   1231:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1232:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1233:                return;
                   1234:        }
                   1235:        ip->ip_ttl -= IPTTLDEC;
                   1236:
1.19      mycroft  1237:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1238:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1239:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1240:                if (ipforward_rt.ro_rt) {
                   1241:                        RTFREE(ipforward_rt.ro_rt);
                   1242:                        ipforward_rt.ro_rt = 0;
                   1243:                }
                   1244:                sin->sin_family = AF_INET;
1.35      mycroft  1245:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1246:                sin->sin_addr = ip->ip_dst;
                   1247:
                   1248:                rtalloc(&ipforward_rt);
                   1249:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1250:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1251:                        return;
                   1252:                }
                   1253:                rt = ipforward_rt.ro_rt;
                   1254:        }
                   1255:
                   1256:        /*
1.34      mycroft  1257:         * Save at most 68 bytes of the packet in case
1.1       cgd      1258:         * we need to generate an ICMP message to the src.
                   1259:         */
1.34      mycroft  1260:        mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1       cgd      1261:
                   1262:        /*
                   1263:         * If forwarding packet using same interface that it came in on,
                   1264:         * perhaps should send a redirect to sender to shortcut a hop.
                   1265:         * Only send redirect if source is sending directly to us,
                   1266:         * and if packet was not source routed (or has any options).
                   1267:         * Also, don't send redirect if forwarding using a default route
                   1268:         * or a route modified by a redirect.
                   1269:         */
                   1270:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1271:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1272:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1273:            ipsendredirects && !srcrt) {
1.19      mycroft  1274:                if (rt->rt_ifa &&
                   1275:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1276:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1277:                        if (rt->rt_flags & RTF_GATEWAY)
                   1278:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1279:                        else
                   1280:                                dest = ip->ip_dst.s_addr;
                   1281:                        /*
                   1282:                         * Router requirements says to only send host
                   1283:                         * redirects.
                   1284:                         */
                   1285:                        type = ICMP_REDIRECT;
                   1286:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1287: #ifdef DIAGNOSTIC
1.77      thorpej  1288:                        if (ipprintfs)
                   1289:                                printf("redirect (%d) to %x\n", code,
                   1290:                                    (u_int32_t)dest);
1.1       cgd      1291: #endif
                   1292:                }
                   1293:        }
                   1294:
1.27      thorpej  1295:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1296:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1297:        if (error)
                   1298:                ipstat.ips_cantforward++;
                   1299:        else {
                   1300:                ipstat.ips_forward++;
                   1301:                if (type)
                   1302:                        ipstat.ips_redirectsent++;
                   1303:                else {
1.63      matt     1304:                        if (mcopy) {
                   1305: #ifdef GATEWAY
1.64      thorpej  1306:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1307:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1308: #endif
1.1       cgd      1309:                                m_freem(mcopy);
1.63      matt     1310:                        }
1.1       cgd      1311:                        return;
                   1312:                }
                   1313:        }
                   1314:        if (mcopy == NULL)
                   1315:                return;
1.13      mycroft  1316:        destifp = NULL;
                   1317:
1.1       cgd      1318:        switch (error) {
                   1319:
                   1320:        case 0:                         /* forwarded, but need redirect */
                   1321:                /* type, code set above */
                   1322:                break;
                   1323:
                   1324:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1325:        case EHOSTUNREACH:
                   1326:        case ENETDOWN:
                   1327:        case EHOSTDOWN:
                   1328:        default:
                   1329:                type = ICMP_UNREACH;
                   1330:                code = ICMP_UNREACH_HOST;
                   1331:                break;
                   1332:
                   1333:        case EMSGSIZE:
                   1334:                type = ICMP_UNREACH;
                   1335:                code = ICMP_UNREACH_NEEDFRAG;
1.13      mycroft  1336:                if (ipforward_rt.ro_rt)
                   1337:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.1       cgd      1338:                ipstat.ips_cantfrag++;
                   1339:                break;
                   1340:
                   1341:        case ENOBUFS:
                   1342:                type = ICMP_SOURCEQUENCH;
                   1343:                code = 0;
                   1344:                break;
                   1345:        }
1.13      mycroft  1346:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1347: }
                   1348:
                   1349: void
                   1350: ip_savecontrol(inp, mp, ip, m)
                   1351:        register struct inpcb *inp;
                   1352:        register struct mbuf **mp;
                   1353:        register struct ip *ip;
                   1354:        register struct mbuf *m;
                   1355: {
                   1356:
                   1357:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1358:                struct timeval tv;
                   1359:
                   1360:                microtime(&tv);
                   1361:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1362:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1363:                if (*mp)
                   1364:                        mp = &(*mp)->m_next;
                   1365:        }
                   1366:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1367:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1368:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1369:                if (*mp)
                   1370:                        mp = &(*mp)->m_next;
                   1371:        }
                   1372: #ifdef notyet
                   1373:        /*
                   1374:         * XXX
                   1375:         * Moving these out of udp_input() made them even more broken
                   1376:         * than they already were.
                   1377:         *      - fenner@parc.xerox.com
                   1378:         */
                   1379:        /* options were tossed already */
                   1380:        if (inp->inp_flags & INP_RECVOPTS) {
                   1381:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1382:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1383:                if (*mp)
                   1384:                        mp = &(*mp)->m_next;
                   1385:        }
                   1386:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1387:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1388:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1389:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1390:                if (*mp)
                   1391:                        mp = &(*mp)->m_next;
                   1392:        }
                   1393: #endif
                   1394:        if (inp->inp_flags & INP_RECVIF) {
                   1395:                struct sockaddr_dl sdl;
                   1396:
                   1397:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1398:                sdl.sdl_family = AF_LINK;
                   1399:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1400:                    m->m_pkthdr.rcvif->if_index : 0;
                   1401:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1402:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1403:                    IP_RECVIF, IPPROTO_IP);
                   1404:                if (*mp)
                   1405:                        mp = &(*mp)->m_next;
                   1406:        }
1.13      mycroft  1407: }
                   1408:
                   1409: int
                   1410: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1411:        int *name;
                   1412:        u_int namelen;
                   1413:        void *oldp;
                   1414:        size_t *oldlenp;
                   1415:        void *newp;
                   1416:        size_t newlen;
                   1417: {
1.52      thorpej  1418:        extern int subnetsarelocal;
                   1419:
1.54      lukem    1420:        int error, old;
                   1421:
1.13      mycroft  1422:        /* All sysctl names at this level are terminal. */
                   1423:        if (namelen != 1)
                   1424:                return (ENOTDIR);
                   1425:
                   1426:        switch (name[0]) {
                   1427:        case IPCTL_FORWARDING:
                   1428:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1429:        case IPCTL_SENDREDIRECTS:
                   1430:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1431:                        &ipsendredirects));
                   1432:        case IPCTL_DEFTTL:
                   1433:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1434: #ifdef notyet
                   1435:        case IPCTL_DEFMTU:
                   1436:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1437: #endif
1.26      thorpej  1438:        case IPCTL_FORWSRCRT:
1.47      cjs      1439:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1440:                if (securelevel > 0)
1.46      cjs      1441:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1442:                            ip_forwsrcrt));
                   1443:                else
                   1444:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1445:                            &ip_forwsrcrt));
1.27      thorpej  1446:        case IPCTL_DIRECTEDBCAST:
                   1447:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1448:                    &ip_directedbcast));
1.47      cjs      1449:        case IPCTL_ALLOWSRCRT:
                   1450:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1451:                    &ip_allowsrcrt));
1.52      thorpej  1452:        case IPCTL_SUBNETSARELOCAL:
                   1453:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1454:                    &subnetsarelocal));
1.53      kml      1455:        case IPCTL_MTUDISC:
1.60      kml      1456:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1457:                    &ip_mtudisc);
                   1458:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
                   1459:                        ip_mtudisc_timeout_q =
                   1460:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1461:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1462:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1463:                        ip_mtudisc_timeout_q = NULL;
                   1464:                }
                   1465:                return error;
1.54      lukem    1466:        case IPCTL_ANONPORTMIN:
                   1467:                old = anonportmin;
                   1468:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
                   1469:                if (anonportmin >= anonportmax || anonportmin > 65535
                   1470: #ifndef IPNOPRIVPORTS
                   1471:                    || anonportmin < IPPORT_RESERVED
                   1472: #endif
                   1473:                    ) {
                   1474:                        anonportmin = old;
                   1475:                        return (EINVAL);
                   1476:                }
                   1477:                return (error);
                   1478:        case IPCTL_ANONPORTMAX:
                   1479:                old = anonportmax;
                   1480:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
                   1481:                if (anonportmin >= anonportmax || anonportmax > 65535
                   1482: #ifndef IPNOPRIVPORTS
                   1483:                    || anonportmax < IPPORT_RESERVED
                   1484: #endif
                   1485:                    ) {
                   1486:                        anonportmax = old;
                   1487:                        return (EINVAL);
                   1488:                }
1.60      kml      1489:                return (error);
                   1490:        case IPCTL_MTUDISCTIMEOUT:
                   1491:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1492:                   &ip_mtudisc_timeout);
                   1493:                if (ip_mtudisc_timeout_q != NULL)
                   1494:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1495:                                              ip_mtudisc_timeout);
1.54      lukem    1496:                return (error);
1.65      matt     1497: #ifdef GATEWAY
                   1498:        case IPCTL_MAXFLOWS:
1.67      thorpej  1499:            {
                   1500:                int s;
                   1501:
1.65      matt     1502:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1503:                   &ip_maxflows);
1.67      thorpej  1504:                s = splsoftnet();
1.65      matt     1505:                ipflow_reap(0);
1.67      thorpej  1506:                splx(s);
1.65      matt     1507:                return (error);
1.67      thorpej  1508:            }
1.65      matt     1509: #endif
1.13      mycroft  1510:        default:
                   1511:                return (EOPNOTSUPP);
                   1512:        }
                   1513:        /* NOTREACHED */
1.1       cgd      1514: }

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