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Annotation of src/sys/netinet/ip_input.c, Revision 1.82.2.7

1.82.2.7! he          1: /*     $NetBSD: ip_input.c,v 1.82.2.6 2000/05/06 16:43:25 he 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;
1.82.2.7! he        170: int    ip_nfragpackets = 0;
        !           171: int    ip_maxfragpackets = 200;
1.75      thorpej   172:
                    173: static __inline int ipq_lock_try __P((void));
                    174: static __inline void ipq_unlock __P((void));
                    175:
                    176: static __inline int
                    177: ipq_lock_try()
                    178: {
                    179:        int s;
                    180:
                    181:        s = splimp();
                    182:        if (ipq_locked) {
                    183:                splx(s);
                    184:                return (0);
                    185:        }
                    186:        ipq_locked = 1;
                    187:        splx(s);
                    188:        return (1);
                    189: }
                    190:
                    191: static __inline void
                    192: ipq_unlock()
                    193: {
                    194:        int s;
                    195:
                    196:        s = splimp();
                    197:        ipq_locked = 0;
                    198:        splx(s);
                    199: }
                    200:
                    201: #ifdef DIAGNOSTIC
                    202: #define        IPQ_LOCK()                                                      \
                    203: do {                                                                   \
                    204:        if (ipq_lock_try() == 0) {                                      \
                    205:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    206:                panic("ipq_lock");                                      \
                    207:        }                                                               \
                    208: } while (0)
                    209: #define        IPQ_LOCK_CHECK()                                                \
                    210: do {                                                                   \
                    211:        if (ipq_locked == 0) {                                          \
                    212:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    213:                panic("ipq lock check");                                \
                    214:        }                                                               \
                    215: } while (0)
                    216: #else
                    217: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    218: #define        IPQ_LOCK_CHECK()        /* nothing */
                    219: #endif
                    220:
                    221: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       222:
1.72      thorpej   223: struct pool ipqent_pool;
                    224:
1.1       cgd       225: /*
                    226:  * We need to save the IP options in case a protocol wants to respond
                    227:  * to an incoming packet over the same route if the packet got here
                    228:  * using IP source routing.  This allows connection establishment and
                    229:  * maintenance when the remote end is on a network that is not known
                    230:  * to us.
                    231:  */
                    232: int    ip_nhops = 0;
                    233: static struct ip_srcrt {
                    234:        struct  in_addr dst;                    /* final destination */
                    235:        char    nop;                            /* one NOP to align */
                    236:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    237:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    238: } ip_srcrt;
                    239:
1.13      mycroft   240: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   241:
1.1       cgd       242: /*
                    243:  * IP initialization: fill in IP protocol switch table.
                    244:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    245:  */
1.8       mycroft   246: void
1.1       cgd       247: ip_init()
                    248: {
                    249:        register struct protosw *pr;
                    250:        register int i;
                    251:
1.72      thorpej   252:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    253:            0, NULL, NULL, M_IPQ);
                    254:
1.1       cgd       255:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    256:        if (pr == 0)
                    257:                panic("ip_init");
                    258:        for (i = 0; i < IPPROTO_MAX; i++)
                    259:                ip_protox[i] = pr - inetsw;
                    260:        for (pr = inetdomain.dom_protosw;
                    261:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    262:                if (pr->pr_domain->dom_family == PF_INET &&
                    263:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    264:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       265:        LIST_INIT(&ipq);
1.1       cgd       266:        ip_id = time.tv_sec & 0xffff;
                    267:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   268:        TAILQ_INIT(&in_ifaddr);
1.57      tls       269:        in_ifaddrhashtbl =
                    270:            hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60      kml       271:        if (ip_mtudisc != 0)
                    272:                ip_mtudisc_timeout_q =
                    273:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   274: #ifdef GATEWAY
                    275:        ipflow_init();
                    276: #endif
1.1       cgd       277: }
                    278:
                    279: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    280: struct route ipforward_rt;
                    281:
                    282: /*
                    283:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    284:  * try to reassemble.  Process options.  Pass to next level.
                    285:  */
1.8       mycroft   286: void
1.1       cgd       287: ipintr()
                    288: {
1.33      mrg       289:        register struct ip *ip = NULL;
1.1       cgd       290:        register struct mbuf *m;
                    291:        register struct ipq *fp;
                    292:        register struct in_ifaddr *ia;
1.57      tls       293:        register struct ifaddr *ifa;
1.25      cgd       294:        struct ipqent *ipqe;
1.35      mycroft   295:        int hlen = 0, mff, len, s;
1.36      mrg       296: #ifdef PFIL_HOOKS
1.33      mrg       297:        struct packet_filter_hook *pfh;
                    298:        struct mbuf *m0;
1.43      mrg       299:        int rv;
1.36      mrg       300: #endif /* PFIL_HOOKS */
1.1       cgd       301:
                    302: next:
                    303:        /*
                    304:         * Get next datagram off input queue and get IP header
                    305:         * in first mbuf.
                    306:         */
                    307:        s = splimp();
                    308:        IF_DEQUEUE(&ipintrq, m);
                    309:        splx(s);
1.13      mycroft   310:        if (m == 0)
1.1       cgd       311:                return;
                    312: #ifdef DIAGNOSTIC
                    313:        if ((m->m_flags & M_PKTHDR) == 0)
                    314:                panic("ipintr no HDR");
                    315: #endif
                    316:        /*
                    317:         * If no IP addresses have been set yet but the interfaces
                    318:         * are receiving, can't do anything with incoming packets yet.
                    319:         */
1.22      mycroft   320:        if (in_ifaddr.tqh_first == 0)
1.1       cgd       321:                goto bad;
                    322:        ipstat.ips_total++;
                    323:        if (m->m_len < sizeof (struct ip) &&
                    324:            (m = m_pullup(m, sizeof (struct ip))) == 0) {
                    325:                ipstat.ips_toosmall++;
                    326:                goto next;
                    327:        }
                    328:        ip = mtod(m, struct ip *);
1.13      mycroft   329:        if (ip->ip_v != IPVERSION) {
                    330:                ipstat.ips_badvers++;
                    331:                goto bad;
                    332:        }
1.1       cgd       333:        hlen = ip->ip_hl << 2;
                    334:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    335:                ipstat.ips_badhlen++;
                    336:                goto bad;
                    337:        }
                    338:        if (hlen > m->m_len) {
                    339:                if ((m = m_pullup(m, hlen)) == 0) {
                    340:                        ipstat.ips_badhlen++;
                    341:                        goto next;
                    342:                }
                    343:                ip = mtod(m, struct ip *);
                    344:        }
1.82.2.4  he        345:
                    346:        /*
                    347:         * RFC1122: packets with a multicast source address are
                    348:         * not allowed.
                    349:         */
                    350:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
                    351:                /* XXX stat */
                    352:                goto bad;
                    353:        }
                    354:
1.78      mycroft   355:        if (in_cksum(m, hlen) != 0) {
1.1       cgd       356:                ipstat.ips_badsum++;
                    357:                goto bad;
                    358:        }
                    359:
                    360:        /*
                    361:         * Convert fields to host representation.
                    362:         */
                    363:        NTOHS(ip->ip_len);
                    364:        NTOHS(ip->ip_off);
1.35      mycroft   365:        len = ip->ip_len;
1.81      proff     366:
                    367:        /*
                    368:         * Check for additional length bogosity
                    369:         */
                    370:        if (len < hlen)
                    371:        {
                    372:                ipstat.ips_badlen++;
                    373:                goto bad;
                    374:        }
1.1       cgd       375:
                    376:        /*
                    377:         * Check that the amount of data in the buffers
                    378:         * is as at least much as the IP header would have us expect.
                    379:         * Trim mbufs if longer than we expect.
                    380:         * Drop packet if shorter than we expect.
                    381:         */
1.35      mycroft   382:        if (m->m_pkthdr.len < len) {
1.1       cgd       383:                ipstat.ips_tooshort++;
                    384:                goto bad;
                    385:        }
1.35      mycroft   386:        if (m->m_pkthdr.len > len) {
1.1       cgd       387:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   388:                        m->m_len = len;
                    389:                        m->m_pkthdr.len = len;
1.1       cgd       390:                } else
1.35      mycroft   391:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       392:        }
                    393:
1.64      thorpej   394:        /*
                    395:         * Assume that we can create a fast-forward IP flow entry
                    396:         * based on this packet.
                    397:         */
                    398:        m->m_flags |= M_CANFASTFWD;
                    399:
1.36      mrg       400: #ifdef PFIL_HOOKS
1.33      mrg       401:        /*
1.64      thorpej   402:         * Run through list of hooks for input packets.  If there are any
                    403:         * filters which require that additional packets in the flow are
                    404:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    405:         * Note that filters must _never_ set this flag, as another filter
                    406:         * in the list may have previously cleared it.
1.33      mrg       407:         */
                    408:        m0 = m;
1.59      mrg       409:        for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next)
1.33      mrg       410:                if (pfh->pfil_func) {
1.43      mrg       411:                        rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
                    412:                        if (rv)
1.40      veego     413:                                goto next;
1.68      sommerfe  414:                        m = m0;
                    415:                        if (m == NULL)
                    416:                                goto next;
                    417:                        ip = mtod(m, struct ip *);
1.33      mrg       418:                }
1.36      mrg       419: #endif /* PFIL_HOOKS */
1.33      mrg       420:
1.1       cgd       421:        /*
                    422:         * Process options and, if not destined for us,
                    423:         * ship it on.  ip_dooptions returns 1 when an
                    424:         * error was detected (causing an icmp message
                    425:         * to be sent and the original packet to be freed).
                    426:         */
                    427:        ip_nhops = 0;           /* for source routed packets */
                    428:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
                    429:                goto next;
                    430:
                    431:        /*
                    432:         * Check our list of addresses, to see if the packet is for us.
                    433:         */
1.57      tls       434:        INADDR_TO_IA(ip->ip_dst, ia);
1.82.2.2  perry     435:        if (ia != NULL)
                    436:                goto ours;
1.57      tls       437:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
                    438:                for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    439:                    ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
                    440:                        if (ifa->ifa_addr->sa_family != AF_INET) continue;
                    441:                        ia = ifatoia(ifa);
1.35      mycroft   442:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    443:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   444:                            /*
                    445:                             * Look for all-0's host part (old broadcast addr),
                    446:                             * either for subnet or net.
                    447:                             */
                    448:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   449:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       450:                                goto ours;
1.57      tls       451:                        /*
                    452:                         * An interface with IP address zero accepts
                    453:                         * all packets that arrive on that interface.
                    454:                         */
                    455:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    456:                                goto ours;
1.1       cgd       457:                }
                    458:        }
1.18      mycroft   459:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   460:                struct in_multi *inm;
                    461: #ifdef MROUTING
                    462:                extern struct socket *ip_mrouter;
1.10      brezak    463:
                    464:                if (m->m_flags & M_EXT) {
                    465:                        if ((m = m_pullup(m, hlen)) == 0) {
                    466:                                ipstat.ips_toosmall++;
                    467:                                goto next;
                    468:                        }
                    469:                        ip = mtod(m, struct ip *);
                    470:                }
1.4       hpeyerl   471:
                    472:                if (ip_mrouter) {
                    473:                        /*
                    474:                         * If we are acting as a multicast router, all
                    475:                         * incoming multicast packets are passed to the
                    476:                         * kernel-level multicast forwarding function.
                    477:                         * The packet is returned (relatively) intact; if
                    478:                         * ip_mforward() returns a non-zero value, the packet
                    479:                         * must be discarded, else it may be accepted below.
                    480:                         *
                    481:                         * (The IP ident field is put in the same byte order
                    482:                         * as expected when ip_mforward() is called from
                    483:                         * ip_output().)
                    484:                         */
1.13      mycroft   485:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    486:                                ipstat.ips_cantforward++;
1.4       hpeyerl   487:                                m_freem(m);
                    488:                                goto next;
                    489:                        }
                    490:
                    491:                        /*
                    492:                         * The process-level routing demon needs to receive
                    493:                         * all multicast IGMP packets, whether or not this
                    494:                         * host belongs to their destination groups.
                    495:                         */
                    496:                        if (ip->ip_p == IPPROTO_IGMP)
                    497:                                goto ours;
1.13      mycroft   498:                        ipstat.ips_forward++;
1.4       hpeyerl   499:                }
                    500: #endif
                    501:                /*
                    502:                 * See if we belong to the destination multicast group on the
                    503:                 * arrival interface.
                    504:                 */
                    505:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    506:                if (inm == NULL) {
1.13      mycroft   507:                        ipstat.ips_cantforward++;
1.4       hpeyerl   508:                        m_freem(m);
                    509:                        goto next;
                    510:                }
                    511:                goto ours;
                    512:        }
1.19      mycroft   513:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   514:            in_nullhost(ip->ip_dst))
1.1       cgd       515:                goto ours;
                    516:
                    517:        /*
                    518:         * Not for us; forward if possible and desirable.
                    519:         */
                    520:        if (ipforwarding == 0) {
                    521:                ipstat.ips_cantforward++;
                    522:                m_freem(m);
                    523:        } else
                    524:                ip_forward(m, 0);
                    525:        goto next;
                    526:
                    527: ours:
                    528:        /*
                    529:         * If offset or IP_MF are set, must reassemble.
                    530:         * Otherwise, nothing need be done.
                    531:         * (We could look in the reassembly queue to see
                    532:         * if the packet was previously fragmented,
                    533:         * but it's not worth the time; just let them time out.)
                    534:         */
1.37      perry     535:        if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1       cgd       536:                /*
                    537:                 * Look for queue of fragments
                    538:                 * of this datagram.
                    539:                 */
1.75      thorpej   540:                IPQ_LOCK();
1.25      cgd       541:                for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1       cgd       542:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   543:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    544:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       545:                            ip->ip_p == fp->ipq_p)
                    546:                                goto found;
                    547:                fp = 0;
                    548: found:
                    549:
                    550:                /*
                    551:                 * Adjust ip_len to not reflect header,
1.25      cgd       552:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       553:                 * convert offset of this to bytes.
                    554:                 */
                    555:                ip->ip_len -= hlen;
1.25      cgd       556:                mff = (ip->ip_off & IP_MF) != 0;
                    557:                if (mff) {
1.16      cgd       558:                        /*
                    559:                         * Make sure that fragments have a data length
                    560:                         * that's a non-zero multiple of 8 bytes.
                    561:                         */
1.17      cgd       562:                        if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16      cgd       563:                                ipstat.ips_badfrags++;
1.75      thorpej   564:                                IPQ_UNLOCK();
1.16      cgd       565:                                goto bad;
                    566:                        }
                    567:                }
1.1       cgd       568:                ip->ip_off <<= 3;
                    569:
                    570:                /*
                    571:                 * If datagram marked as having more fragments
                    572:                 * or if this is not the first fragment,
                    573:                 * attempt reassembly; if it succeeds, proceed.
                    574:                 */
1.25      cgd       575:                if (mff || ip->ip_off) {
1.1       cgd       576:                        ipstat.ips_fragments++;
1.72      thorpej   577:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       578:                        if (ipqe == NULL) {
                    579:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   580:                                IPQ_UNLOCK();
1.25      cgd       581:                                goto bad;
                    582:                        }
                    583:                        ipqe->ipqe_mff = mff;
1.50      thorpej   584:                        ipqe->ipqe_m = m;
1.25      cgd       585:                        ipqe->ipqe_ip = ip;
1.50      thorpej   586:                        m = ip_reass(ipqe, fp);
1.75      thorpej   587:                        if (m == 0) {
                    588:                                IPQ_UNLOCK();
1.1       cgd       589:                                goto next;
1.75      thorpej   590:                        }
1.13      mycroft   591:                        ipstat.ips_reassembled++;
1.50      thorpej   592:                        ip = mtod(m, struct ip *);
1.74      thorpej   593:                        hlen = ip->ip_hl << 2;
1.79      mycroft   594:                        ip->ip_len += hlen;
1.1       cgd       595:                } else
                    596:                        if (fp)
                    597:                                ip_freef(fp);
1.75      thorpej   598:                IPQ_UNLOCK();
1.79      mycroft   599:        }
1.1       cgd       600:
                    601:        /*
                    602:         * Switch out to protocol's input routine.
                    603:         */
1.82      aidan     604: #if IFA_STATS
                    605:        ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
                    606: #endif
1.1       cgd       607:        ipstat.ips_delivered++;
                    608:        (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
                    609:        goto next;
                    610: bad:
                    611:        m_freem(m);
                    612:        goto next;
                    613: }
                    614:
                    615: /*
                    616:  * Take incoming datagram fragment and try to
                    617:  * reassemble it into whole datagram.  If a chain for
                    618:  * reassembly of this datagram already exists, then it
                    619:  * is given as fp; otherwise have to make a chain.
                    620:  */
1.50      thorpej   621: struct mbuf *
1.25      cgd       622: ip_reass(ipqe, fp)
                    623:        register struct ipqent *ipqe;
1.1       cgd       624:        register struct ipq *fp;
                    625: {
1.50      thorpej   626:        register struct mbuf *m = ipqe->ipqe_m;
1.25      cgd       627:        register struct ipqent *nq, *p, *q;
                    628:        struct ip *ip;
1.1       cgd       629:        struct mbuf *t;
1.25      cgd       630:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       631:        int i, next;
                    632:
1.75      thorpej   633:        IPQ_LOCK_CHECK();
                    634:
1.1       cgd       635:        /*
                    636:         * Presence of header sizes in mbufs
                    637:         * would confuse code below.
                    638:         */
                    639:        m->m_data += hlen;
                    640:        m->m_len -= hlen;
                    641:
                    642:        /*
                    643:         * If first fragment to arrive, create a reassembly queue.
                    644:         */
                    645:        if (fp == 0) {
1.82.2.7! he        646:                /*
        !           647:                 * Enforce upper bound on number of fragmented packets
        !           648:                 * for which we attempt reassembly;
        !           649:                 * If maxfrag is 0, never accept fragments.
        !           650:                 * If maxfrag is -1, accept all fragments without limitation.
        !           651:                 */
        !           652:                if (ip_maxfragpackets < 0)
        !           653:                        ;
        !           654:                else if (ip_nfragpackets >= ip_maxfragpackets)
        !           655:                        goto dropfrag;
        !           656:                ip_nfragpackets++;
1.50      thorpej   657:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    658:                    M_FTABLE, M_NOWAIT);
                    659:                if (fp == NULL)
1.1       cgd       660:                        goto dropfrag;
1.25      cgd       661:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       662:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       663:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    664:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
                    665:                LIST_INIT(&fp->ipq_fragq);
                    666:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    667:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    668:                p = NULL;
1.1       cgd       669:                goto insert;
                    670:        }
                    671:
                    672:        /*
                    673:         * Find a segment which begins after this one does.
                    674:         */
1.25      cgd       675:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    676:            p = q, q = q->ipqe_q.le_next)
                    677:                if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1       cgd       678:                        break;
                    679:
                    680:        /*
                    681:         * If there is a preceding segment, it may provide some of
                    682:         * our data already.  If so, drop the data from the incoming
                    683:         * segment.  If it provides all of our data, drop us.
                    684:         */
1.25      cgd       685:        if (p != NULL) {
                    686:                i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
                    687:                    ipqe->ipqe_ip->ip_off;
1.1       cgd       688:                if (i > 0) {
1.25      cgd       689:                        if (i >= ipqe->ipqe_ip->ip_len)
1.1       cgd       690:                                goto dropfrag;
1.50      thorpej   691:                        m_adj(ipqe->ipqe_m, i);
1.25      cgd       692:                        ipqe->ipqe_ip->ip_off += i;
                    693:                        ipqe->ipqe_ip->ip_len -= i;
1.1       cgd       694:                }
                    695:        }
                    696:
                    697:        /*
                    698:         * While we overlap succeeding segments trim them or,
                    699:         * if they are completely covered, dequeue them.
                    700:         */
1.25      cgd       701:        for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
                    702:            q->ipqe_ip->ip_off; q = nq) {
                    703:                i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
                    704:                    q->ipqe_ip->ip_off;
                    705:                if (i < q->ipqe_ip->ip_len) {
                    706:                        q->ipqe_ip->ip_len -= i;
                    707:                        q->ipqe_ip->ip_off += i;
1.50      thorpej   708:                        m_adj(q->ipqe_m, i);
1.1       cgd       709:                        break;
                    710:                }
1.25      cgd       711:                nq = q->ipqe_q.le_next;
1.50      thorpej   712:                m_freem(q->ipqe_m);
1.25      cgd       713:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   714:                pool_put(&ipqent_pool, q);
1.1       cgd       715:        }
                    716:
                    717: insert:
                    718:        /*
                    719:         * Stick new segment in its place;
                    720:         * check for complete reassembly.
                    721:         */
1.25      cgd       722:        if (p == NULL) {
                    723:                LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
                    724:        } else {
                    725:                LIST_INSERT_AFTER(p, ipqe, ipqe_q);
                    726:        }
1.1       cgd       727:        next = 0;
1.25      cgd       728:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    729:            p = q, q = q->ipqe_q.le_next) {
                    730:                if (q->ipqe_ip->ip_off != next)
1.1       cgd       731:                        return (0);
1.25      cgd       732:                next += q->ipqe_ip->ip_len;
1.1       cgd       733:        }
1.25      cgd       734:        if (p->ipqe_mff)
1.1       cgd       735:                return (0);
                    736:
                    737:        /*
1.41      thorpej   738:         * Reassembly is complete.  Check for a bogus message size and
                    739:         * concatenate fragments.
1.1       cgd       740:         */
1.25      cgd       741:        q = fp->ipq_fragq.lh_first;
                    742:        ip = q->ipqe_ip;
1.41      thorpej   743:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    744:                ipstat.ips_toolong++;
                    745:                ip_freef(fp);
                    746:                return (0);
                    747:        }
1.50      thorpej   748:        m = q->ipqe_m;
1.1       cgd       749:        t = m->m_next;
                    750:        m->m_next = 0;
                    751:        m_cat(m, t);
1.25      cgd       752:        nq = q->ipqe_q.le_next;
1.72      thorpej   753:        pool_put(&ipqent_pool, q);
1.25      cgd       754:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   755:                t = q->ipqe_m;
1.25      cgd       756:                nq = q->ipqe_q.le_next;
1.72      thorpej   757:                pool_put(&ipqent_pool, q);
1.1       cgd       758:                m_cat(m, t);
                    759:        }
                    760:
                    761:        /*
                    762:         * Create header for new ip packet by
                    763:         * modifying header of first packet;
                    764:         * dequeue and discard fragment reassembly header.
                    765:         * Make header visible.
                    766:         */
                    767:        ip->ip_len = next;
1.25      cgd       768:        ip->ip_src = fp->ipq_src;
                    769:        ip->ip_dst = fp->ipq_dst;
                    770:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   771:        FREE(fp, M_FTABLE);
1.82.2.7! he        772:        ip_nfragpackets--;
1.1       cgd       773:        m->m_len += (ip->ip_hl << 2);
                    774:        m->m_data -= (ip->ip_hl << 2);
                    775:        /* some debugging cruft by sklower, below, will go away soon */
                    776:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
                    777:                register int plen = 0;
1.50      thorpej   778:                for (t = m; t; t = t->m_next)
                    779:                        plen += t->m_len;
                    780:                m->m_pkthdr.len = plen;
1.1       cgd       781:        }
1.50      thorpej   782:        return (m);
1.1       cgd       783:
                    784: dropfrag:
                    785:        ipstat.ips_fragdropped++;
                    786:        m_freem(m);
1.72      thorpej   787:        pool_put(&ipqent_pool, ipqe);
1.1       cgd       788:        return (0);
                    789: }
                    790:
                    791: /*
                    792:  * Free a fragment reassembly header and all
                    793:  * associated datagrams.
                    794:  */
1.8       mycroft   795: void
1.1       cgd       796: ip_freef(fp)
                    797:        struct ipq *fp;
                    798: {
1.25      cgd       799:        register struct ipqent *q, *p;
1.1       cgd       800:
1.75      thorpej   801:        IPQ_LOCK_CHECK();
                    802:
1.25      cgd       803:        for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
                    804:                p = q->ipqe_q.le_next;
1.50      thorpej   805:                m_freem(q->ipqe_m);
1.25      cgd       806:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   807:                pool_put(&ipqent_pool, q);
1.1       cgd       808:        }
1.25      cgd       809:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   810:        FREE(fp, M_FTABLE);
1.82.2.7! he        811:        ip_nfragpackets--;
1.1       cgd       812: }
                    813:
                    814: /*
                    815:  * IP timer processing;
                    816:  * if a timer expires on a reassembly
                    817:  * queue, discard it.
                    818:  */
1.8       mycroft   819: void
1.1       cgd       820: ip_slowtimo()
                    821: {
1.25      cgd       822:        register struct ipq *fp, *nfp;
1.24      mycroft   823:        int s = splsoftnet();
1.1       cgd       824:
1.75      thorpej   825:        IPQ_LOCK();
1.25      cgd       826:        for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
                    827:                nfp = fp->ipq_q.le_next;
                    828:                if (--fp->ipq_ttl == 0) {
1.1       cgd       829:                        ipstat.ips_fragtimeout++;
1.25      cgd       830:                        ip_freef(fp);
1.1       cgd       831:                }
                    832:        }
1.82.2.7! he        833:        /*
        !           834:         * If we are over the maximum number of fragments
        !           835:         * (due to the limit being lowered), drain off
        !           836:         * enough to get down to the new limit.
        !           837:         */
        !           838:        if (ip_maxfragpackets < 0)
        !           839:                ;
        !           840:        else {
        !           841:                while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
        !           842:                        ip_freef(ipq.lh_first);
        !           843:        }
1.75      thorpej   844:        IPQ_UNLOCK();
1.63      matt      845: #ifdef GATEWAY
                    846:        ipflow_slowtimo();
                    847: #endif
1.1       cgd       848:        splx(s);
                    849: }
                    850:
                    851: /*
                    852:  * Drain off all datagram fragments.
                    853:  */
1.8       mycroft   854: void
1.1       cgd       855: ip_drain()
                    856: {
                    857:
1.75      thorpej   858:        /*
                    859:         * We may be called from a device's interrupt context.  If
                    860:         * the ipq is already busy, just bail out now.
                    861:         */
                    862:        if (ipq_lock_try() == 0)
                    863:                return;
                    864:
1.25      cgd       865:        while (ipq.lh_first != NULL) {
1.1       cgd       866:                ipstat.ips_fragdropped++;
1.25      cgd       867:                ip_freef(ipq.lh_first);
1.1       cgd       868:        }
1.75      thorpej   869:
                    870:        IPQ_UNLOCK();
1.1       cgd       871: }
                    872:
                    873: /*
                    874:  * Do option processing on a datagram,
                    875:  * possibly discarding it if bad options are encountered,
                    876:  * or forwarding it if source-routed.
                    877:  * Returns 1 if packet has been forwarded/freed,
                    878:  * 0 if the packet should be processed further.
                    879:  */
1.8       mycroft   880: int
1.1       cgd       881: ip_dooptions(m)
                    882:        struct mbuf *m;
                    883: {
                    884:        register struct ip *ip = mtod(m, struct ip *);
1.82.2.5  he        885:        register u_char *cp, *cp0;
1.1       cgd       886:        register struct ip_timestamp *ipt;
                    887:        register struct in_ifaddr *ia;
                    888:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.82.2.5  he        889:        struct in_addr dst;
1.1       cgd       890:        n_time ntime;
                    891:
1.13      mycroft   892:        dst = ip->ip_dst;
1.1       cgd       893:        cp = (u_char *)(ip + 1);
                    894:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    895:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    896:                opt = cp[IPOPT_OPTVAL];
                    897:                if (opt == IPOPT_EOL)
                    898:                        break;
                    899:                if (opt == IPOPT_NOP)
                    900:                        optlen = 1;
                    901:                else {
                    902:                        optlen = cp[IPOPT_OLEN];
                    903:                        if (optlen <= 0 || optlen > cnt) {
                    904:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    905:                                goto bad;
                    906:                        }
                    907:                }
                    908:                switch (opt) {
                    909:
                    910:                default:
                    911:                        break;
                    912:
                    913:                /*
                    914:                 * Source routing with record.
                    915:                 * Find interface with current destination address.
                    916:                 * If none on this machine then drop if strictly routed,
                    917:                 * or do nothing if loosely routed.
                    918:                 * Record interface address and bring up next address
                    919:                 * component.  If strictly routed make sure next
                    920:                 * address is on directly accessible net.
                    921:                 */
                    922:                case IPOPT_LSRR:
                    923:                case IPOPT_SSRR:
1.47      cjs       924:                        if (ip_allowsrcrt == 0) {
                    925:                                type = ICMP_UNREACH;
                    926:                                code = ICMP_UNREACH_NET_PROHIB;
                    927:                                goto bad;
                    928:                        }
1.1       cgd       929:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    930:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    931:                                goto bad;
                    932:                        }
                    933:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   934:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       935:                        if (ia == 0) {
                    936:                                if (opt == IPOPT_SSRR) {
                    937:                                        type = ICMP_UNREACH;
                    938:                                        code = ICMP_UNREACH_SRCFAIL;
                    939:                                        goto bad;
                    940:                                }
                    941:                                /*
                    942:                                 * Loose routing, and not at next destination
                    943:                                 * yet; nothing to do except forward.
                    944:                                 */
                    945:                                break;
                    946:                        }
                    947:                        off--;                  /* 0 origin */
1.82.2.6  he        948:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       949:                                /*
                    950:                                 * End of source route.  Should be for us.
                    951:                                 */
                    952:                                save_rte(cp, ip->ip_src);
                    953:                                break;
                    954:                        }
                    955:                        /*
                    956:                         * locate outgoing interface
                    957:                         */
                    958:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                    959:                            sizeof(ipaddr.sin_addr));
                    960:                        if (opt == IPOPT_SSRR) {
                    961: #define        INA     struct in_ifaddr *
                    962: #define        SA      struct sockaddr *
1.29      mrg       963:                            ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1       cgd       964:                        } else
                    965:                                ia = ip_rtaddr(ipaddr.sin_addr);
                    966:                        if (ia == 0) {
                    967:                                type = ICMP_UNREACH;
                    968:                                code = ICMP_UNREACH_SRCFAIL;
                    969:                                goto bad;
                    970:                        }
                    971:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft   972:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd       973:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                    974:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   975:                        /*
                    976:                         * Let ip_intr's mcast routing check handle mcast pkts
                    977:                         */
1.18      mycroft   978:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       979:                        break;
                    980:
                    981:                case IPOPT_RR:
                    982:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    983:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    984:                                goto bad;
                    985:                        }
                    986:                        /*
                    987:                         * If no space remains, ignore.
                    988:                         */
                    989:                        off--;                  /* 0 origin */
1.82.2.6  he        990:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd       991:                                break;
                    992:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                    993:                            sizeof(ipaddr.sin_addr));
                    994:                        /*
                    995:                         * locate outgoing interface; if we're the destination,
                    996:                         * use the incoming interface (should be same).
                    997:                         */
                    998:                        if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
                    999:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
                   1000:                                type = ICMP_UNREACH;
                   1001:                                code = ICMP_UNREACH_HOST;
                   1002:                                goto bad;
                   1003:                        }
1.20      mycroft  1004:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1005:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1006:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1007:                        break;
                   1008:
                   1009:                case IPOPT_TS:
                   1010:                        code = cp - (u_char *)ip;
                   1011:                        ipt = (struct ip_timestamp *)cp;
                   1012:                        if (ipt->ipt_len < 5)
                   1013:                                goto bad;
1.15      cgd      1014:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1       cgd      1015:                                if (++ipt->ipt_oflw == 0)
                   1016:                                        goto bad;
                   1017:                                break;
                   1018:                        }
1.82.2.5  he       1019:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1020:                        switch (ipt->ipt_flg) {
                   1021:
                   1022:                        case IPOPT_TS_TSONLY:
                   1023:                                break;
                   1024:
                   1025:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1026:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1027:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1028:                                        goto bad;
1.13      mycroft  1029:                                ipaddr.sin_addr = dst;
                   1030:                                ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
                   1031:                                                            m->m_pkthdr.rcvif);
                   1032:                                if (ia == 0)
                   1033:                                        continue;
1.82.2.5  he       1034:                                bcopy(&ia->ia_addr.sin_addr,
                   1035:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1036:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1037:                                break;
                   1038:
                   1039:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1040:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1041:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1042:                                        goto bad;
1.82.2.5  he       1043:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1044:                                    sizeof(struct in_addr));
                   1045:                                if (ifa_ifwithaddr((SA)&ipaddr) == 0)
                   1046:                                        continue;
                   1047:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1048:                                break;
                   1049:
                   1050:                        default:
                   1051:                                goto bad;
                   1052:                        }
                   1053:                        ntime = iptime();
1.82.2.5  he       1054:                        cp0 = (u_char *) &ntime;        /* XXX GCC BUG */
                   1055:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1056:                            sizeof(n_time));
                   1057:                        ipt->ipt_ptr += sizeof(n_time);
                   1058:                }
                   1059:        }
                   1060:        if (forward) {
1.26      thorpej  1061:                if (ip_forwsrcrt == 0) {
                   1062:                        type = ICMP_UNREACH;
                   1063:                        code = ICMP_UNREACH_SRCFAIL;
                   1064:                        goto bad;
                   1065:                }
1.1       cgd      1066:                ip_forward(m, 1);
                   1067:                return (1);
1.13      mycroft  1068:        }
                   1069:        return (0);
1.1       cgd      1070: bad:
1.13      mycroft  1071:        icmp_error(m, type, code, 0, 0);
                   1072:        ipstat.ips_badoptions++;
1.1       cgd      1073:        return (1);
                   1074: }
                   1075:
                   1076: /*
                   1077:  * Given address of next destination (final or next hop),
                   1078:  * return internet address info of interface to be used to get there.
                   1079:  */
                   1080: struct in_ifaddr *
                   1081: ip_rtaddr(dst)
                   1082:         struct in_addr dst;
                   1083: {
                   1084:        register struct sockaddr_in *sin;
                   1085:
1.19      mycroft  1086:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1087:
1.35      mycroft  1088:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1089:                if (ipforward_rt.ro_rt) {
                   1090:                        RTFREE(ipforward_rt.ro_rt);
                   1091:                        ipforward_rt.ro_rt = 0;
                   1092:                }
                   1093:                sin->sin_family = AF_INET;
                   1094:                sin->sin_len = sizeof(*sin);
                   1095:                sin->sin_addr = dst;
                   1096:
                   1097:                rtalloc(&ipforward_rt);
                   1098:        }
                   1099:        if (ipforward_rt.ro_rt == 0)
                   1100:                return ((struct in_ifaddr *)0);
1.19      mycroft  1101:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1102: }
                   1103:
                   1104: /*
                   1105:  * Save incoming source route for use in replies,
                   1106:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1107:  */
1.13      mycroft  1108: void
1.1       cgd      1109: save_rte(option, dst)
                   1110:        u_char *option;
                   1111:        struct in_addr dst;
                   1112: {
                   1113:        unsigned olen;
                   1114:
                   1115:        olen = option[IPOPT_OLEN];
                   1116: #ifdef DIAGNOSTIC
                   1117:        if (ipprintfs)
1.39      christos 1118:                printf("save_rte: olen %d\n", olen);
1.1       cgd      1119: #endif
                   1120:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1121:                return;
                   1122:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1123:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1124:        ip_srcrt.dst = dst;
                   1125: }
                   1126:
                   1127: /*
                   1128:  * Retrieve incoming source route for use in replies,
                   1129:  * in the same form used by setsockopt.
                   1130:  * The first hop is placed before the options, will be removed later.
                   1131:  */
                   1132: struct mbuf *
                   1133: ip_srcroute()
                   1134: {
                   1135:        register struct in_addr *p, *q;
                   1136:        register struct mbuf *m;
                   1137:
                   1138:        if (ip_nhops == 0)
                   1139:                return ((struct mbuf *)0);
                   1140:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1141:        if (m == 0)
                   1142:                return ((struct mbuf *)0);
                   1143:
1.13      mycroft  1144: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1145:
                   1146:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1147:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1148:            OPTSIZ;
                   1149: #ifdef DIAGNOSTIC
                   1150:        if (ipprintfs)
1.39      christos 1151:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1152: #endif
                   1153:
                   1154:        /*
                   1155:         * First save first hop for return route
                   1156:         */
                   1157:        p = &ip_srcrt.route[ip_nhops - 1];
                   1158:        *(mtod(m, struct in_addr *)) = *p--;
                   1159: #ifdef DIAGNOSTIC
                   1160:        if (ipprintfs)
1.39      christos 1161:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1162: #endif
                   1163:
                   1164:        /*
                   1165:         * Copy option fields and padding (nop) to mbuf.
                   1166:         */
                   1167:        ip_srcrt.nop = IPOPT_NOP;
                   1168:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1169:        bcopy((caddr_t)&ip_srcrt.nop,
                   1170:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1171:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1172:            sizeof(struct in_addr) + OPTSIZ);
                   1173: #undef OPTSIZ
                   1174:        /*
                   1175:         * Record return path as an IP source route,
                   1176:         * reversing the path (pointers are now aligned).
                   1177:         */
                   1178:        while (p >= ip_srcrt.route) {
                   1179: #ifdef DIAGNOSTIC
                   1180:                if (ipprintfs)
1.39      christos 1181:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1182: #endif
                   1183:                *q++ = *p--;
                   1184:        }
                   1185:        /*
                   1186:         * Last hop goes to final destination.
                   1187:         */
                   1188:        *q = ip_srcrt.dst;
                   1189: #ifdef DIAGNOSTIC
                   1190:        if (ipprintfs)
1.39      christos 1191:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1192: #endif
                   1193:        return (m);
                   1194: }
                   1195:
                   1196: /*
                   1197:  * Strip out IP options, at higher
                   1198:  * level protocol in the kernel.
                   1199:  * Second argument is buffer to which options
                   1200:  * will be moved, and return value is their length.
                   1201:  * XXX should be deleted; last arg currently ignored.
                   1202:  */
1.8       mycroft  1203: void
1.1       cgd      1204: ip_stripoptions(m, mopt)
                   1205:        register struct mbuf *m;
                   1206:        struct mbuf *mopt;
                   1207: {
                   1208:        register int i;
                   1209:        struct ip *ip = mtod(m, struct ip *);
                   1210:        register caddr_t opts;
                   1211:        int olen;
                   1212:
1.79      mycroft  1213:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1214:        opts = (caddr_t)(ip + 1);
                   1215:        i = m->m_len - (sizeof (struct ip) + olen);
                   1216:        bcopy(opts  + olen, opts, (unsigned)i);
                   1217:        m->m_len -= olen;
                   1218:        if (m->m_flags & M_PKTHDR)
                   1219:                m->m_pkthdr.len -= olen;
1.79      mycroft  1220:        ip->ip_len -= olen;
                   1221:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1222: }
                   1223:
1.23      mycroft  1224: int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1225:        0,              0,              0,              0,
                   1226:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1227:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1228:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1229:        0,              0,              0,              0,
                   1230:        ENOPROTOOPT
                   1231: };
                   1232:
                   1233: /*
                   1234:  * Forward a packet.  If some error occurs return the sender
                   1235:  * an icmp packet.  Note we can't always generate a meaningful
                   1236:  * icmp message because icmp doesn't have a large enough repertoire
                   1237:  * of codes and types.
                   1238:  *
                   1239:  * If not forwarding, just drop the packet.  This could be confusing
                   1240:  * if ipforwarding was zero but some routing protocol was advancing
                   1241:  * us as a gateway to somewhere.  However, we must let the routing
                   1242:  * protocol deal with that.
                   1243:  *
                   1244:  * The srcrt parameter indicates whether the packet is being forwarded
                   1245:  * via a source route.
                   1246:  */
1.13      mycroft  1247: void
1.1       cgd      1248: ip_forward(m, srcrt)
                   1249:        struct mbuf *m;
                   1250:        int srcrt;
                   1251: {
                   1252:        register struct ip *ip = mtod(m, struct ip *);
                   1253:        register struct sockaddr_in *sin;
                   1254:        register struct rtentry *rt;
1.28      christos 1255:        int error, type = 0, code = 0;
1.1       cgd      1256:        struct mbuf *mcopy;
1.13      mycroft  1257:        n_long dest;
                   1258:        struct ifnet *destifp;
1.1       cgd      1259:
1.13      mycroft  1260:        dest = 0;
1.1       cgd      1261: #ifdef DIAGNOSTIC
                   1262:        if (ipprintfs)
1.70      thorpej  1263:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1264:                    ntohl(ip->ip_src.s_addr),
                   1265:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1266: #endif
1.82.2.3  cgd      1267:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1268:                ipstat.ips_cantforward++;
                   1269:                m_freem(m);
                   1270:                return;
                   1271:        }
                   1272:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1273:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1274:                return;
                   1275:        }
                   1276:        ip->ip_ttl -= IPTTLDEC;
                   1277:
1.19      mycroft  1278:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1279:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1280:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1281:                if (ipforward_rt.ro_rt) {
                   1282:                        RTFREE(ipforward_rt.ro_rt);
                   1283:                        ipforward_rt.ro_rt = 0;
                   1284:                }
                   1285:                sin->sin_family = AF_INET;
1.35      mycroft  1286:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1287:                sin->sin_addr = ip->ip_dst;
                   1288:
                   1289:                rtalloc(&ipforward_rt);
                   1290:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1291:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1292:                        return;
                   1293:                }
                   1294:                rt = ipforward_rt.ro_rt;
                   1295:        }
                   1296:
                   1297:        /*
1.34      mycroft  1298:         * Save at most 68 bytes of the packet in case
1.1       cgd      1299:         * we need to generate an ICMP message to the src.
                   1300:         */
1.34      mycroft  1301:        mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1       cgd      1302:
                   1303:        /*
                   1304:         * If forwarding packet using same interface that it came in on,
                   1305:         * perhaps should send a redirect to sender to shortcut a hop.
                   1306:         * Only send redirect if source is sending directly to us,
                   1307:         * and if packet was not source routed (or has any options).
                   1308:         * Also, don't send redirect if forwarding using a default route
                   1309:         * or a route modified by a redirect.
                   1310:         */
                   1311:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1312:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1313:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1314:            ipsendredirects && !srcrt) {
1.19      mycroft  1315:                if (rt->rt_ifa &&
                   1316:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1317:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1318:                        if (rt->rt_flags & RTF_GATEWAY)
                   1319:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1320:                        else
                   1321:                                dest = ip->ip_dst.s_addr;
                   1322:                        /*
                   1323:                         * Router requirements says to only send host
                   1324:                         * redirects.
                   1325:                         */
                   1326:                        type = ICMP_REDIRECT;
                   1327:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1328: #ifdef DIAGNOSTIC
1.77      thorpej  1329:                        if (ipprintfs)
                   1330:                                printf("redirect (%d) to %x\n", code,
                   1331:                                    (u_int32_t)dest);
1.1       cgd      1332: #endif
                   1333:                }
                   1334:        }
                   1335:
1.27      thorpej  1336:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1337:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1338:        if (error)
                   1339:                ipstat.ips_cantforward++;
                   1340:        else {
                   1341:                ipstat.ips_forward++;
                   1342:                if (type)
                   1343:                        ipstat.ips_redirectsent++;
                   1344:                else {
1.63      matt     1345:                        if (mcopy) {
                   1346: #ifdef GATEWAY
1.64      thorpej  1347:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1348:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1349: #endif
1.1       cgd      1350:                                m_freem(mcopy);
1.63      matt     1351:                        }
1.1       cgd      1352:                        return;
                   1353:                }
                   1354:        }
                   1355:        if (mcopy == NULL)
                   1356:                return;
1.13      mycroft  1357:        destifp = NULL;
                   1358:
1.1       cgd      1359:        switch (error) {
                   1360:
                   1361:        case 0:                         /* forwarded, but need redirect */
                   1362:                /* type, code set above */
                   1363:                break;
                   1364:
                   1365:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1366:        case EHOSTUNREACH:
                   1367:        case ENETDOWN:
                   1368:        case EHOSTDOWN:
                   1369:        default:
                   1370:                type = ICMP_UNREACH;
                   1371:                code = ICMP_UNREACH_HOST;
                   1372:                break;
                   1373:
                   1374:        case EMSGSIZE:
                   1375:                type = ICMP_UNREACH;
                   1376:                code = ICMP_UNREACH_NEEDFRAG;
1.13      mycroft  1377:                if (ipforward_rt.ro_rt)
                   1378:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.1       cgd      1379:                ipstat.ips_cantfrag++;
                   1380:                break;
                   1381:
                   1382:        case ENOBUFS:
                   1383:                type = ICMP_SOURCEQUENCH;
                   1384:                code = 0;
                   1385:                break;
                   1386:        }
1.13      mycroft  1387:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1388: }
                   1389:
                   1390: void
                   1391: ip_savecontrol(inp, mp, ip, m)
                   1392:        register struct inpcb *inp;
                   1393:        register struct mbuf **mp;
                   1394:        register struct ip *ip;
                   1395:        register struct mbuf *m;
                   1396: {
                   1397:
                   1398:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1399:                struct timeval tv;
                   1400:
                   1401:                microtime(&tv);
                   1402:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1403:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1404:                if (*mp)
                   1405:                        mp = &(*mp)->m_next;
                   1406:        }
                   1407:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1408:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1409:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1410:                if (*mp)
                   1411:                        mp = &(*mp)->m_next;
                   1412:        }
                   1413: #ifdef notyet
                   1414:        /*
                   1415:         * XXX
                   1416:         * Moving these out of udp_input() made them even more broken
                   1417:         * than they already were.
                   1418:         *      - fenner@parc.xerox.com
                   1419:         */
                   1420:        /* options were tossed already */
                   1421:        if (inp->inp_flags & INP_RECVOPTS) {
                   1422:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1423:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1424:                if (*mp)
                   1425:                        mp = &(*mp)->m_next;
                   1426:        }
                   1427:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1428:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1429:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1430:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1431:                if (*mp)
                   1432:                        mp = &(*mp)->m_next;
                   1433:        }
                   1434: #endif
                   1435:        if (inp->inp_flags & INP_RECVIF) {
                   1436:                struct sockaddr_dl sdl;
                   1437:
                   1438:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1439:                sdl.sdl_family = AF_LINK;
                   1440:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1441:                    m->m_pkthdr.rcvif->if_index : 0;
                   1442:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1443:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1444:                    IP_RECVIF, IPPROTO_IP);
                   1445:                if (*mp)
                   1446:                        mp = &(*mp)->m_next;
                   1447:        }
1.13      mycroft  1448: }
                   1449:
                   1450: int
                   1451: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1452:        int *name;
                   1453:        u_int namelen;
                   1454:        void *oldp;
                   1455:        size_t *oldlenp;
                   1456:        void *newp;
                   1457:        size_t newlen;
                   1458: {
1.52      thorpej  1459:        extern int subnetsarelocal;
                   1460:
1.54      lukem    1461:        int error, old;
                   1462:
1.13      mycroft  1463:        /* All sysctl names at this level are terminal. */
                   1464:        if (namelen != 1)
                   1465:                return (ENOTDIR);
                   1466:
                   1467:        switch (name[0]) {
                   1468:        case IPCTL_FORWARDING:
                   1469:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1470:        case IPCTL_SENDREDIRECTS:
                   1471:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1472:                        &ipsendredirects));
                   1473:        case IPCTL_DEFTTL:
                   1474:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1475: #ifdef notyet
                   1476:        case IPCTL_DEFMTU:
                   1477:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1478: #endif
1.26      thorpej  1479:        case IPCTL_FORWSRCRT:
1.47      cjs      1480:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1481:                if (securelevel > 0)
1.46      cjs      1482:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1483:                            ip_forwsrcrt));
                   1484:                else
                   1485:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1486:                            &ip_forwsrcrt));
1.27      thorpej  1487:        case IPCTL_DIRECTEDBCAST:
                   1488:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1489:                    &ip_directedbcast));
1.47      cjs      1490:        case IPCTL_ALLOWSRCRT:
                   1491:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1492:                    &ip_allowsrcrt));
1.52      thorpej  1493:        case IPCTL_SUBNETSARELOCAL:
                   1494:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1495:                    &subnetsarelocal));
1.53      kml      1496:        case IPCTL_MTUDISC:
1.60      kml      1497:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1498:                    &ip_mtudisc);
                   1499:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
                   1500:                        ip_mtudisc_timeout_q =
                   1501:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1502:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1503:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1504:                        ip_mtudisc_timeout_q = NULL;
                   1505:                }
                   1506:                return error;
1.54      lukem    1507:        case IPCTL_ANONPORTMIN:
                   1508:                old = anonportmin;
                   1509:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
                   1510:                if (anonportmin >= anonportmax || anonportmin > 65535
                   1511: #ifndef IPNOPRIVPORTS
                   1512:                    || anonportmin < IPPORT_RESERVED
                   1513: #endif
                   1514:                    ) {
                   1515:                        anonportmin = old;
                   1516:                        return (EINVAL);
                   1517:                }
                   1518:                return (error);
                   1519:        case IPCTL_ANONPORTMAX:
                   1520:                old = anonportmax;
                   1521:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
                   1522:                if (anonportmin >= anonportmax || anonportmax > 65535
                   1523: #ifndef IPNOPRIVPORTS
                   1524:                    || anonportmax < IPPORT_RESERVED
                   1525: #endif
                   1526:                    ) {
                   1527:                        anonportmax = old;
                   1528:                        return (EINVAL);
                   1529:                }
1.60      kml      1530:                return (error);
                   1531:        case IPCTL_MTUDISCTIMEOUT:
                   1532:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1533:                   &ip_mtudisc_timeout);
                   1534:                if (ip_mtudisc_timeout_q != NULL)
                   1535:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1536:                                              ip_mtudisc_timeout);
1.54      lukem    1537:                return (error);
1.65      matt     1538: #ifdef GATEWAY
                   1539:        case IPCTL_MAXFLOWS:
1.67      thorpej  1540:            {
                   1541:                int s;
                   1542:
1.65      matt     1543:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1544:                   &ip_maxflows);
1.67      thorpej  1545:                s = splsoftnet();
1.65      matt     1546:                ipflow_reap(0);
1.67      thorpej  1547:                splx(s);
1.65      matt     1548:                return (error);
1.67      thorpej  1549:            }
1.65      matt     1550: #endif
1.82.2.7! he       1551:
        !          1552:        case IPCTL_MAXFRAGPACKETS:
        !          1553:                return (sysctl_int(oldp, oldlenp, newp, newlen,
        !          1554:                    &ip_maxfragpackets));
        !          1555:
1.13      mycroft  1556:        default:
                   1557:                return (EOPNOTSUPP);
                   1558:        }
                   1559:        /* NOTREACHED */
1.1       cgd      1560: }

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