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Annotation of src/sys/netinet/ip_input.c, Revision 1.91

1.91    ! thorpej     1: /*     $NetBSD: ip_input.c,v 1.90 1999/07/06 12:23:20 itojun Exp $     */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
                     81:  * 3. All advertising materials mentioning features or use of this software
                     82:  *    must display the following acknowledgement:
                     83:  *     This product includes software developed by the University of
                     84:  *     California, Berkeley and its contributors.
                     85:  * 4. Neither the name of the University nor the names of its contributors
                     86:  *    may be used to endorse or promote products derived from this software
                     87:  *    without specific prior written permission.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     90:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     91:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     92:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     93:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     94:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     95:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     96:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     97:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     98:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     99:  * SUCH DAMAGE.
                    100:  *
1.14      cgd       101:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd       102:  */
1.55      scottr    103:
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91    ! thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.1       cgd       108:
1.5       mycroft   109: #include <sys/param.h>
                    110: #include <sys/systm.h>
                    111: #include <sys/malloc.h>
                    112: #include <sys/mbuf.h>
                    113: #include <sys/domain.h>
                    114: #include <sys/protosw.h>
                    115: #include <sys/socket.h>
1.44      thorpej   116: #include <sys/socketvar.h>
1.5       mycroft   117: #include <sys/errno.h>
                    118: #include <sys/time.h>
                    119: #include <sys/kernel.h>
1.28      christos  120: #include <sys/proc.h>
1.72      thorpej   121: #include <sys/pool.h>
1.28      christos  122:
                    123: #include <vm/vm.h>
                    124: #include <sys/sysctl.h>
1.1       cgd       125:
1.5       mycroft   126: #include <net/if.h>
1.44      thorpej   127: #include <net/if_dl.h>
1.5       mycroft   128: #include <net/route.h>
1.45      mrg       129: #include <net/pfil.h>
1.1       cgd       130:
1.5       mycroft   131: #include <netinet/in.h>
                    132: #include <netinet/in_systm.h>
                    133: #include <netinet/ip.h>
                    134: #include <netinet/in_pcb.h>
                    135: #include <netinet/in_var.h>
                    136: #include <netinet/ip_var.h>
                    137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
                    141:
                    142: #ifdef IPSEC
                    143: #include <netinet6/ipsec.h>
                    144: #include <netinet6/ah.h>
                    145: #ifdef IPSEC_ESP
                    146: #include <netinet6/esp.h>
                    147: #endif
                    148: #include <netkey/key.h>
                    149: #include <netkey/key_debug.h>
                    150: #endif
1.44      thorpej   151:
1.1       cgd       152: #ifndef        IPFORWARDING
                    153: #ifdef GATEWAY
                    154: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    155: #else /* GATEWAY */
                    156: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    157: #endif /* GATEWAY */
                    158: #endif /* IPFORWARDING */
                    159: #ifndef        IPSENDREDIRECTS
                    160: #define        IPSENDREDIRECTS 1
                    161: #endif
1.26      thorpej   162: #ifndef IPFORWSRCRT
1.47      cjs       163: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    164: #endif
                    165: #ifndef IPALLOWSRCRT
1.48      mrg       166: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   167: #endif
1.53      kml       168: #ifndef IPMTUDISC
                    169: #define IPMTUDISC      0
                    170: #endif
1.60      kml       171: #ifndef IPMTUDISCTIMEOUT
1.61      kml       172: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       173: #endif
1.53      kml       174:
1.27      thorpej   175: /*
                    176:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    177:  * configuration using this option will Just Work.
                    178:  */
                    179: #ifndef IPDIRECTEDBCAST
                    180: #ifdef DIRECTED_BROADCAST
                    181: #define IPDIRECTEDBCAST        1
                    182: #else
                    183: #define        IPDIRECTEDBCAST 0
                    184: #endif /* DIRECTED_BROADCAST */
                    185: #endif /* IPDIRECTEDBCAST */
1.1       cgd       186: int    ipforwarding = IPFORWARDING;
                    187: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   188: int    ip_defttl = IPDEFTTL;
1.26      thorpej   189: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   190: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       191: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       192: int    ip_mtudisc = IPMTUDISC;
1.60      kml       193: u_int  ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       194: #ifdef DIAGNOSTIC
                    195: int    ipprintfs = 0;
                    196: #endif
                    197:
1.60      kml       198: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    199:
1.1       cgd       200: extern struct domain inetdomain;
                    201: extern struct protosw inetsw[];
                    202: u_char ip_protox[IPPROTO_MAX];
                    203: int    ipqmaxlen = IFQ_MAXLEN;
1.22      mycroft   204: struct in_ifaddrhead in_ifaddr;
1.57      tls       205: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13      mycroft   206: struct ifqueue ipintrq;
1.63      matt      207: struct ipstat  ipstat;
                    208: u_int16_t      ip_id;
                    209: int    ip_defttl;
1.75      thorpej   210:
1.63      matt      211: struct ipqhead ipq;
1.75      thorpej   212: int    ipq_locked;
                    213:
                    214: static __inline int ipq_lock_try __P((void));
                    215: static __inline void ipq_unlock __P((void));
                    216:
                    217: static __inline int
                    218: ipq_lock_try()
                    219: {
                    220:        int s;
                    221:
                    222:        s = splimp();
                    223:        if (ipq_locked) {
                    224:                splx(s);
                    225:                return (0);
                    226:        }
                    227:        ipq_locked = 1;
                    228:        splx(s);
                    229:        return (1);
                    230: }
                    231:
                    232: static __inline void
                    233: ipq_unlock()
                    234: {
                    235:        int s;
                    236:
                    237:        s = splimp();
                    238:        ipq_locked = 0;
                    239:        splx(s);
                    240: }
                    241:
                    242: #ifdef DIAGNOSTIC
                    243: #define        IPQ_LOCK()                                                      \
                    244: do {                                                                   \
                    245:        if (ipq_lock_try() == 0) {                                      \
                    246:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    247:                panic("ipq_lock");                                      \
                    248:        }                                                               \
                    249: } while (0)
                    250: #define        IPQ_LOCK_CHECK()                                                \
                    251: do {                                                                   \
                    252:        if (ipq_locked == 0) {                                          \
                    253:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    254:                panic("ipq lock check");                                \
                    255:        }                                                               \
                    256: } while (0)
                    257: #else
                    258: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    259: #define        IPQ_LOCK_CHECK()        /* nothing */
                    260: #endif
                    261:
                    262: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       263:
1.72      thorpej   264: struct pool ipqent_pool;
                    265:
1.1       cgd       266: /*
                    267:  * We need to save the IP options in case a protocol wants to respond
                    268:  * to an incoming packet over the same route if the packet got here
                    269:  * using IP source routing.  This allows connection establishment and
                    270:  * maintenance when the remote end is on a network that is not known
                    271:  * to us.
                    272:  */
                    273: int    ip_nhops = 0;
                    274: static struct ip_srcrt {
                    275:        struct  in_addr dst;                    /* final destination */
                    276:        char    nop;                            /* one NOP to align */
                    277:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    278:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    279: } ip_srcrt;
                    280:
1.13      mycroft   281: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   282:
1.1       cgd       283: /*
                    284:  * IP initialization: fill in IP protocol switch table.
                    285:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    286:  */
1.8       mycroft   287: void
1.1       cgd       288: ip_init()
                    289: {
                    290:        register struct protosw *pr;
                    291:        register int i;
                    292:
1.72      thorpej   293:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    294:            0, NULL, NULL, M_IPQ);
                    295:
1.1       cgd       296:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    297:        if (pr == 0)
                    298:                panic("ip_init");
                    299:        for (i = 0; i < IPPROTO_MAX; i++)
                    300:                ip_protox[i] = pr - inetsw;
                    301:        for (pr = inetdomain.dom_protosw;
                    302:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    303:                if (pr->pr_domain->dom_family == PF_INET &&
                    304:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    305:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       306:        LIST_INIT(&ipq);
1.1       cgd       307:        ip_id = time.tv_sec & 0xffff;
                    308:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   309:        TAILQ_INIT(&in_ifaddr);
1.57      tls       310:        in_ifaddrhashtbl =
                    311:            hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60      kml       312:        if (ip_mtudisc != 0)
                    313:                ip_mtudisc_timeout_q =
                    314:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   315: #ifdef GATEWAY
                    316:        ipflow_init();
                    317: #endif
1.1       cgd       318: }
                    319:
                    320: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    321: struct route ipforward_rt;
                    322:
                    323: /*
1.89      itojun    324:  * IP software interrupt routine
                    325:  */
                    326: void
                    327: ipintr()
                    328: {
                    329:        int s;
                    330:        struct mbuf *m;
                    331:
                    332:        while (1) {
                    333:                s = splimp();
                    334:                IF_DEQUEUE(&ipintrq, m);
                    335:                splx(s);
                    336:                if (m == 0)
                    337:                        return;
                    338:                ip_input(m);
                    339:        }
                    340: }
                    341:
                    342: /*
1.1       cgd       343:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    344:  * try to reassemble.  Process options.  Pass to next level.
                    345:  */
1.8       mycroft   346: void
1.89      itojun    347: ip_input(struct mbuf *m)
1.1       cgd       348: {
1.33      mrg       349:        register struct ip *ip = NULL;
1.1       cgd       350:        register struct ipq *fp;
                    351:        register struct in_ifaddr *ia;
1.57      tls       352:        register struct ifaddr *ifa;
1.25      cgd       353:        struct ipqent *ipqe;
1.89      itojun    354:        int hlen = 0, mff, len;
1.36      mrg       355: #ifdef PFIL_HOOKS
1.33      mrg       356:        struct packet_filter_hook *pfh;
                    357:        struct mbuf *m0;
1.43      mrg       358:        int rv;
1.36      mrg       359: #endif /* PFIL_HOOKS */
1.1       cgd       360:
                    361: #ifdef DIAGNOSTIC
                    362:        if ((m->m_flags & M_PKTHDR) == 0)
                    363:                panic("ipintr no HDR");
                    364: #endif
1.89      itojun    365: #ifdef IPSEC
                    366:        /*
                    367:         * should the inner packet be considered authentic?
                    368:         * see comment in ah4_input().
                    369:         */
                    370:        if (m) {
                    371:                m->m_flags &= ~M_AUTHIPHDR;
                    372:                m->m_flags &= ~M_AUTHIPDGM;
                    373:        }
                    374: #endif
1.1       cgd       375:        /*
                    376:         * If no IP addresses have been set yet but the interfaces
                    377:         * are receiving, can't do anything with incoming packets yet.
                    378:         */
1.22      mycroft   379:        if (in_ifaddr.tqh_first == 0)
1.1       cgd       380:                goto bad;
                    381:        ipstat.ips_total++;
                    382:        if (m->m_len < sizeof (struct ip) &&
                    383:            (m = m_pullup(m, sizeof (struct ip))) == 0) {
                    384:                ipstat.ips_toosmall++;
1.89      itojun    385:                return;
1.1       cgd       386:        }
                    387:        ip = mtod(m, struct ip *);
1.13      mycroft   388:        if (ip->ip_v != IPVERSION) {
                    389:                ipstat.ips_badvers++;
                    390:                goto bad;
                    391:        }
1.1       cgd       392:        hlen = ip->ip_hl << 2;
                    393:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    394:                ipstat.ips_badhlen++;
                    395:                goto bad;
                    396:        }
                    397:        if (hlen > m->m_len) {
                    398:                if ((m = m_pullup(m, hlen)) == 0) {
                    399:                        ipstat.ips_badhlen++;
1.89      itojun    400:                        return;
1.1       cgd       401:                }
                    402:                ip = mtod(m, struct ip *);
                    403:        }
1.85      hwr       404:        /*
                    405:         * we drop packets that have a multicast address as source
                    406:         * as wanted by rfc 1112
                    407:         */
                    408:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
                    409:                goto bad;
                    410:        }
                    411:
1.78      mycroft   412:        if (in_cksum(m, hlen) != 0) {
1.1       cgd       413:                ipstat.ips_badsum++;
                    414:                goto bad;
                    415:        }
                    416:
                    417:        /*
                    418:         * Convert fields to host representation.
                    419:         */
                    420:        NTOHS(ip->ip_len);
                    421:        NTOHS(ip->ip_off);
1.35      mycroft   422:        len = ip->ip_len;
1.81      proff     423:
                    424:        /*
                    425:         * Check for additional length bogosity
                    426:         */
1.84      proff     427:        if (len < hlen) {
1.81      proff     428:                ipstat.ips_badlen++;
                    429:                goto bad;
                    430:        }
1.1       cgd       431:
                    432:        /*
                    433:         * Check that the amount of data in the buffers
                    434:         * is as at least much as the IP header would have us expect.
                    435:         * Trim mbufs if longer than we expect.
                    436:         * Drop packet if shorter than we expect.
                    437:         */
1.35      mycroft   438:        if (m->m_pkthdr.len < len) {
1.1       cgd       439:                ipstat.ips_tooshort++;
                    440:                goto bad;
                    441:        }
1.35      mycroft   442:        if (m->m_pkthdr.len > len) {
1.1       cgd       443:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   444:                        m->m_len = len;
                    445:                        m->m_pkthdr.len = len;
1.1       cgd       446:                } else
1.35      mycroft   447:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       448:        }
                    449:
1.64      thorpej   450:        /*
                    451:         * Assume that we can create a fast-forward IP flow entry
                    452:         * based on this packet.
                    453:         */
                    454:        m->m_flags |= M_CANFASTFWD;
                    455:
1.36      mrg       456: #ifdef PFIL_HOOKS
1.33      mrg       457:        /*
1.64      thorpej   458:         * Run through list of hooks for input packets.  If there are any
                    459:         * filters which require that additional packets in the flow are
                    460:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    461:         * Note that filters must _never_ set this flag, as another filter
                    462:         * in the list may have previously cleared it.
1.33      mrg       463:         */
                    464:        m0 = m;
1.59      mrg       465:        for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next)
1.33      mrg       466:                if (pfh->pfil_func) {
1.43      mrg       467:                        rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
                    468:                        if (rv)
1.89      itojun    469:                                return;
1.68      sommerfe  470:                        m = m0;
                    471:                        if (m == NULL)
1.89      itojun    472:                                return;
1.68      sommerfe  473:                        ip = mtod(m, struct ip *);
1.33      mrg       474:                }
1.36      mrg       475: #endif /* PFIL_HOOKS */
1.33      mrg       476:
1.1       cgd       477:        /*
                    478:         * Process options and, if not destined for us,
                    479:         * ship it on.  ip_dooptions returns 1 when an
                    480:         * error was detected (causing an icmp message
                    481:         * to be sent and the original packet to be freed).
                    482:         */
                    483:        ip_nhops = 0;           /* for source routed packets */
                    484:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    485:                return;
1.1       cgd       486:
                    487:        /*
                    488:         * Check our list of addresses, to see if the packet is for us.
                    489:         */
1.57      tls       490:        INADDR_TO_IA(ip->ip_dst, ia);
1.86      thorpej   491:        if (ia != NULL)
                    492:                goto ours;
1.57      tls       493:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
                    494:                for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    495:                    ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
                    496:                        if (ifa->ifa_addr->sa_family != AF_INET) continue;
                    497:                        ia = ifatoia(ifa);
1.35      mycroft   498:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    499:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   500:                            /*
                    501:                             * Look for all-0's host part (old broadcast addr),
                    502:                             * either for subnet or net.
                    503:                             */
                    504:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   505:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       506:                                goto ours;
1.57      tls       507:                        /*
                    508:                         * An interface with IP address zero accepts
                    509:                         * all packets that arrive on that interface.
                    510:                         */
                    511:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    512:                                goto ours;
1.1       cgd       513:                }
                    514:        }
1.18      mycroft   515:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   516:                struct in_multi *inm;
                    517: #ifdef MROUTING
                    518:                extern struct socket *ip_mrouter;
1.10      brezak    519:
                    520:                if (m->m_flags & M_EXT) {
                    521:                        if ((m = m_pullup(m, hlen)) == 0) {
                    522:                                ipstat.ips_toosmall++;
1.89      itojun    523:                                return;
1.10      brezak    524:                        }
                    525:                        ip = mtod(m, struct ip *);
                    526:                }
1.4       hpeyerl   527:
                    528:                if (ip_mrouter) {
                    529:                        /*
                    530:                         * If we are acting as a multicast router, all
                    531:                         * incoming multicast packets are passed to the
                    532:                         * kernel-level multicast forwarding function.
                    533:                         * The packet is returned (relatively) intact; if
                    534:                         * ip_mforward() returns a non-zero value, the packet
                    535:                         * must be discarded, else it may be accepted below.
                    536:                         *
                    537:                         * (The IP ident field is put in the same byte order
                    538:                         * as expected when ip_mforward() is called from
                    539:                         * ip_output().)
                    540:                         */
1.13      mycroft   541:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    542:                                ipstat.ips_cantforward++;
1.4       hpeyerl   543:                                m_freem(m);
1.89      itojun    544:                                return;
1.4       hpeyerl   545:                        }
                    546:
                    547:                        /*
                    548:                         * The process-level routing demon needs to receive
                    549:                         * all multicast IGMP packets, whether or not this
                    550:                         * host belongs to their destination groups.
                    551:                         */
                    552:                        if (ip->ip_p == IPPROTO_IGMP)
                    553:                                goto ours;
1.13      mycroft   554:                        ipstat.ips_forward++;
1.4       hpeyerl   555:                }
                    556: #endif
                    557:                /*
                    558:                 * See if we belong to the destination multicast group on the
                    559:                 * arrival interface.
                    560:                 */
                    561:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    562:                if (inm == NULL) {
1.13      mycroft   563:                        ipstat.ips_cantforward++;
1.4       hpeyerl   564:                        m_freem(m);
1.89      itojun    565:                        return;
1.4       hpeyerl   566:                }
                    567:                goto ours;
                    568:        }
1.19      mycroft   569:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   570:            in_nullhost(ip->ip_dst))
1.1       cgd       571:                goto ours;
                    572:
                    573:        /*
                    574:         * Not for us; forward if possible and desirable.
                    575:         */
                    576:        if (ipforwarding == 0) {
                    577:                ipstat.ips_cantforward++;
                    578:                m_freem(m);
                    579:        } else
                    580:                ip_forward(m, 0);
1.89      itojun    581:        return;
1.1       cgd       582:
                    583: ours:
                    584:        /*
                    585:         * If offset or IP_MF are set, must reassemble.
                    586:         * Otherwise, nothing need be done.
                    587:         * (We could look in the reassembly queue to see
                    588:         * if the packet was previously fragmented,
                    589:         * but it's not worth the time; just let them time out.)
                    590:         */
1.37      perry     591:        if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1       cgd       592:                /*
                    593:                 * Look for queue of fragments
                    594:                 * of this datagram.
                    595:                 */
1.75      thorpej   596:                IPQ_LOCK();
1.25      cgd       597:                for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1       cgd       598:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   599:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    600:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       601:                            ip->ip_p == fp->ipq_p)
                    602:                                goto found;
                    603:                fp = 0;
                    604: found:
                    605:
                    606:                /*
                    607:                 * Adjust ip_len to not reflect header,
1.25      cgd       608:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       609:                 * convert offset of this to bytes.
                    610:                 */
                    611:                ip->ip_len -= hlen;
1.25      cgd       612:                mff = (ip->ip_off & IP_MF) != 0;
                    613:                if (mff) {
1.16      cgd       614:                        /*
                    615:                         * Make sure that fragments have a data length
                    616:                         * that's a non-zero multiple of 8 bytes.
                    617:                         */
1.17      cgd       618:                        if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16      cgd       619:                                ipstat.ips_badfrags++;
1.75      thorpej   620:                                IPQ_UNLOCK();
1.16      cgd       621:                                goto bad;
                    622:                        }
                    623:                }
1.1       cgd       624:                ip->ip_off <<= 3;
                    625:
                    626:                /*
                    627:                 * If datagram marked as having more fragments
                    628:                 * or if this is not the first fragment,
                    629:                 * attempt reassembly; if it succeeds, proceed.
                    630:                 */
1.25      cgd       631:                if (mff || ip->ip_off) {
1.1       cgd       632:                        ipstat.ips_fragments++;
1.72      thorpej   633:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       634:                        if (ipqe == NULL) {
                    635:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   636:                                IPQ_UNLOCK();
1.25      cgd       637:                                goto bad;
                    638:                        }
                    639:                        ipqe->ipqe_mff = mff;
1.50      thorpej   640:                        ipqe->ipqe_m = m;
1.25      cgd       641:                        ipqe->ipqe_ip = ip;
1.50      thorpej   642:                        m = ip_reass(ipqe, fp);
1.75      thorpej   643:                        if (m == 0) {
                    644:                                IPQ_UNLOCK();
1.89      itojun    645:                                return;
1.75      thorpej   646:                        }
1.13      mycroft   647:                        ipstat.ips_reassembled++;
1.50      thorpej   648:                        ip = mtod(m, struct ip *);
1.74      thorpej   649:                        hlen = ip->ip_hl << 2;
1.79      mycroft   650:                        ip->ip_len += hlen;
1.1       cgd       651:                } else
                    652:                        if (fp)
                    653:                                ip_freef(fp);
1.75      thorpej   654:                IPQ_UNLOCK();
1.79      mycroft   655:        }
1.1       cgd       656:
                    657:        /*
                    658:         * Switch out to protocol's input routine.
                    659:         */
1.82      aidan     660: #if IFA_STATS
                    661:        ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
                    662: #endif
1.1       cgd       663:        ipstat.ips_delivered++;
1.89      itojun    664:     {
                    665:        int off = hlen, nh = ip->ip_p;
                    666:
                    667:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    668:        return;
                    669:     }
1.1       cgd       670: bad:
                    671:        m_freem(m);
                    672: }
                    673:
                    674: /*
                    675:  * Take incoming datagram fragment and try to
                    676:  * reassemble it into whole datagram.  If a chain for
                    677:  * reassembly of this datagram already exists, then it
                    678:  * is given as fp; otherwise have to make a chain.
                    679:  */
1.50      thorpej   680: struct mbuf *
1.25      cgd       681: ip_reass(ipqe, fp)
                    682:        register struct ipqent *ipqe;
1.1       cgd       683:        register struct ipq *fp;
                    684: {
1.50      thorpej   685:        register struct mbuf *m = ipqe->ipqe_m;
1.25      cgd       686:        register struct ipqent *nq, *p, *q;
                    687:        struct ip *ip;
1.1       cgd       688:        struct mbuf *t;
1.25      cgd       689:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       690:        int i, next;
                    691:
1.75      thorpej   692:        IPQ_LOCK_CHECK();
                    693:
1.1       cgd       694:        /*
                    695:         * Presence of header sizes in mbufs
                    696:         * would confuse code below.
                    697:         */
                    698:        m->m_data += hlen;
                    699:        m->m_len -= hlen;
                    700:
                    701:        /*
                    702:         * If first fragment to arrive, create a reassembly queue.
                    703:         */
                    704:        if (fp == 0) {
1.50      thorpej   705:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    706:                    M_FTABLE, M_NOWAIT);
                    707:                if (fp == NULL)
1.1       cgd       708:                        goto dropfrag;
1.25      cgd       709:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       710:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       711:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    712:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
                    713:                LIST_INIT(&fp->ipq_fragq);
                    714:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    715:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    716:                p = NULL;
1.1       cgd       717:                goto insert;
                    718:        }
                    719:
                    720:        /*
                    721:         * Find a segment which begins after this one does.
                    722:         */
1.25      cgd       723:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    724:            p = q, q = q->ipqe_q.le_next)
                    725:                if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1       cgd       726:                        break;
                    727:
                    728:        /*
                    729:         * If there is a preceding segment, it may provide some of
                    730:         * our data already.  If so, drop the data from the incoming
                    731:         * segment.  If it provides all of our data, drop us.
                    732:         */
1.25      cgd       733:        if (p != NULL) {
                    734:                i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
                    735:                    ipqe->ipqe_ip->ip_off;
1.1       cgd       736:                if (i > 0) {
1.25      cgd       737:                        if (i >= ipqe->ipqe_ip->ip_len)
1.1       cgd       738:                                goto dropfrag;
1.50      thorpej   739:                        m_adj(ipqe->ipqe_m, i);
1.25      cgd       740:                        ipqe->ipqe_ip->ip_off += i;
                    741:                        ipqe->ipqe_ip->ip_len -= i;
1.1       cgd       742:                }
                    743:        }
                    744:
                    745:        /*
                    746:         * While we overlap succeeding segments trim them or,
                    747:         * if they are completely covered, dequeue them.
                    748:         */
1.25      cgd       749:        for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
                    750:            q->ipqe_ip->ip_off; q = nq) {
                    751:                i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
                    752:                    q->ipqe_ip->ip_off;
                    753:                if (i < q->ipqe_ip->ip_len) {
                    754:                        q->ipqe_ip->ip_len -= i;
                    755:                        q->ipqe_ip->ip_off += i;
1.50      thorpej   756:                        m_adj(q->ipqe_m, i);
1.1       cgd       757:                        break;
                    758:                }
1.25      cgd       759:                nq = q->ipqe_q.le_next;
1.50      thorpej   760:                m_freem(q->ipqe_m);
1.25      cgd       761:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   762:                pool_put(&ipqent_pool, q);
1.1       cgd       763:        }
                    764:
                    765: insert:
                    766:        /*
                    767:         * Stick new segment in its place;
                    768:         * check for complete reassembly.
                    769:         */
1.25      cgd       770:        if (p == NULL) {
                    771:                LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
                    772:        } else {
                    773:                LIST_INSERT_AFTER(p, ipqe, ipqe_q);
                    774:        }
1.1       cgd       775:        next = 0;
1.25      cgd       776:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    777:            p = q, q = q->ipqe_q.le_next) {
                    778:                if (q->ipqe_ip->ip_off != next)
1.1       cgd       779:                        return (0);
1.25      cgd       780:                next += q->ipqe_ip->ip_len;
1.1       cgd       781:        }
1.25      cgd       782:        if (p->ipqe_mff)
1.1       cgd       783:                return (0);
                    784:
                    785:        /*
1.41      thorpej   786:         * Reassembly is complete.  Check for a bogus message size and
                    787:         * concatenate fragments.
1.1       cgd       788:         */
1.25      cgd       789:        q = fp->ipq_fragq.lh_first;
                    790:        ip = q->ipqe_ip;
1.41      thorpej   791:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    792:                ipstat.ips_toolong++;
                    793:                ip_freef(fp);
                    794:                return (0);
                    795:        }
1.50      thorpej   796:        m = q->ipqe_m;
1.1       cgd       797:        t = m->m_next;
                    798:        m->m_next = 0;
                    799:        m_cat(m, t);
1.25      cgd       800:        nq = q->ipqe_q.le_next;
1.72      thorpej   801:        pool_put(&ipqent_pool, q);
1.25      cgd       802:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   803:                t = q->ipqe_m;
1.25      cgd       804:                nq = q->ipqe_q.le_next;
1.72      thorpej   805:                pool_put(&ipqent_pool, q);
1.1       cgd       806:                m_cat(m, t);
                    807:        }
                    808:
                    809:        /*
                    810:         * Create header for new ip packet by
                    811:         * modifying header of first packet;
                    812:         * dequeue and discard fragment reassembly header.
                    813:         * Make header visible.
                    814:         */
                    815:        ip->ip_len = next;
1.89      itojun    816:        ip->ip_ttl = 0; /* xxx */
                    817:        ip->ip_sum = 0;
1.25      cgd       818:        ip->ip_src = fp->ipq_src;
                    819:        ip->ip_dst = fp->ipq_dst;
                    820:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   821:        FREE(fp, M_FTABLE);
1.1       cgd       822:        m->m_len += (ip->ip_hl << 2);
                    823:        m->m_data -= (ip->ip_hl << 2);
                    824:        /* some debugging cruft by sklower, below, will go away soon */
                    825:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
                    826:                register int plen = 0;
1.50      thorpej   827:                for (t = m; t; t = t->m_next)
                    828:                        plen += t->m_len;
                    829:                m->m_pkthdr.len = plen;
1.1       cgd       830:        }
1.50      thorpej   831:        return (m);
1.1       cgd       832:
                    833: dropfrag:
                    834:        ipstat.ips_fragdropped++;
                    835:        m_freem(m);
1.72      thorpej   836:        pool_put(&ipqent_pool, ipqe);
1.1       cgd       837:        return (0);
                    838: }
                    839:
                    840: /*
                    841:  * Free a fragment reassembly header and all
                    842:  * associated datagrams.
                    843:  */
1.8       mycroft   844: void
1.1       cgd       845: ip_freef(fp)
                    846:        struct ipq *fp;
                    847: {
1.25      cgd       848:        register struct ipqent *q, *p;
1.1       cgd       849:
1.75      thorpej   850:        IPQ_LOCK_CHECK();
                    851:
1.25      cgd       852:        for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
                    853:                p = q->ipqe_q.le_next;
1.50      thorpej   854:                m_freem(q->ipqe_m);
1.25      cgd       855:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   856:                pool_put(&ipqent_pool, q);
1.1       cgd       857:        }
1.25      cgd       858:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   859:        FREE(fp, M_FTABLE);
1.1       cgd       860: }
                    861:
                    862: /*
                    863:  * IP timer processing;
                    864:  * if a timer expires on a reassembly
                    865:  * queue, discard it.
                    866:  */
1.8       mycroft   867: void
1.1       cgd       868: ip_slowtimo()
                    869: {
1.25      cgd       870:        register struct ipq *fp, *nfp;
1.24      mycroft   871:        int s = splsoftnet();
1.1       cgd       872:
1.75      thorpej   873:        IPQ_LOCK();
1.25      cgd       874:        for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
                    875:                nfp = fp->ipq_q.le_next;
                    876:                if (--fp->ipq_ttl == 0) {
1.1       cgd       877:                        ipstat.ips_fragtimeout++;
1.25      cgd       878:                        ip_freef(fp);
1.1       cgd       879:                }
                    880:        }
1.75      thorpej   881:        IPQ_UNLOCK();
1.63      matt      882: #ifdef GATEWAY
                    883:        ipflow_slowtimo();
                    884: #endif
1.1       cgd       885:        splx(s);
                    886: }
                    887:
                    888: /*
                    889:  * Drain off all datagram fragments.
                    890:  */
1.8       mycroft   891: void
1.1       cgd       892: ip_drain()
                    893: {
                    894:
1.75      thorpej   895:        /*
                    896:         * We may be called from a device's interrupt context.  If
                    897:         * the ipq is already busy, just bail out now.
                    898:         */
                    899:        if (ipq_lock_try() == 0)
                    900:                return;
                    901:
1.25      cgd       902:        while (ipq.lh_first != NULL) {
1.1       cgd       903:                ipstat.ips_fragdropped++;
1.25      cgd       904:                ip_freef(ipq.lh_first);
1.1       cgd       905:        }
1.75      thorpej   906:
                    907:        IPQ_UNLOCK();
1.1       cgd       908: }
                    909:
                    910: /*
                    911:  * Do option processing on a datagram,
                    912:  * possibly discarding it if bad options are encountered,
                    913:  * or forwarding it if source-routed.
                    914:  * Returns 1 if packet has been forwarded/freed,
                    915:  * 0 if the packet should be processed further.
                    916:  */
1.8       mycroft   917: int
1.1       cgd       918: ip_dooptions(m)
                    919:        struct mbuf *m;
                    920: {
                    921:        register struct ip *ip = mtod(m, struct ip *);
                    922:        register u_char *cp;
                    923:        register struct ip_timestamp *ipt;
                    924:        register struct in_ifaddr *ia;
                    925:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13      mycroft   926:        struct in_addr *sin, dst;
1.1       cgd       927:        n_time ntime;
                    928:
1.13      mycroft   929:        dst = ip->ip_dst;
1.1       cgd       930:        cp = (u_char *)(ip + 1);
                    931:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    932:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    933:                opt = cp[IPOPT_OPTVAL];
                    934:                if (opt == IPOPT_EOL)
                    935:                        break;
                    936:                if (opt == IPOPT_NOP)
                    937:                        optlen = 1;
                    938:                else {
                    939:                        optlen = cp[IPOPT_OLEN];
                    940:                        if (optlen <= 0 || optlen > cnt) {
                    941:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    942:                                goto bad;
                    943:                        }
                    944:                }
                    945:                switch (opt) {
                    946:
                    947:                default:
                    948:                        break;
                    949:
                    950:                /*
                    951:                 * Source routing with record.
                    952:                 * Find interface with current destination address.
                    953:                 * If none on this machine then drop if strictly routed,
                    954:                 * or do nothing if loosely routed.
                    955:                 * Record interface address and bring up next address
                    956:                 * component.  If strictly routed make sure next
                    957:                 * address is on directly accessible net.
                    958:                 */
                    959:                case IPOPT_LSRR:
                    960:                case IPOPT_SSRR:
1.47      cjs       961:                        if (ip_allowsrcrt == 0) {
                    962:                                type = ICMP_UNREACH;
                    963:                                code = ICMP_UNREACH_NET_PROHIB;
                    964:                                goto bad;
                    965:                        }
1.1       cgd       966:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    967:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    968:                                goto bad;
                    969:                        }
                    970:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   971:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       972:                        if (ia == 0) {
                    973:                                if (opt == IPOPT_SSRR) {
                    974:                                        type = ICMP_UNREACH;
                    975:                                        code = ICMP_UNREACH_SRCFAIL;
                    976:                                        goto bad;
                    977:                                }
                    978:                                /*
                    979:                                 * Loose routing, and not at next destination
                    980:                                 * yet; nothing to do except forward.
                    981:                                 */
                    982:                                break;
                    983:                        }
                    984:                        off--;                  /* 0 origin */
                    985:                        if (off > optlen - sizeof(struct in_addr)) {
                    986:                                /*
                    987:                                 * End of source route.  Should be for us.
                    988:                                 */
                    989:                                save_rte(cp, ip->ip_src);
                    990:                                break;
                    991:                        }
                    992:                        /*
                    993:                         * locate outgoing interface
                    994:                         */
                    995:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                    996:                            sizeof(ipaddr.sin_addr));
                    997:                        if (opt == IPOPT_SSRR) {
                    998: #define        INA     struct in_ifaddr *
                    999: #define        SA      struct sockaddr *
1.29      mrg      1000:                            ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1       cgd      1001:                        } else
                   1002:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1003:                        if (ia == 0) {
                   1004:                                type = ICMP_UNREACH;
                   1005:                                code = ICMP_UNREACH_SRCFAIL;
                   1006:                                goto bad;
                   1007:                        }
                   1008:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1009:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1010:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1011:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1012:                        /*
                   1013:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1014:                         */
1.18      mycroft  1015:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1016:                        break;
                   1017:
                   1018:                case IPOPT_RR:
                   1019:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1020:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1021:                                goto bad;
                   1022:                        }
                   1023:                        /*
                   1024:                         * If no space remains, ignore.
                   1025:                         */
                   1026:                        off--;                  /* 0 origin */
                   1027:                        if (off > optlen - sizeof(struct in_addr))
                   1028:                                break;
                   1029:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1030:                            sizeof(ipaddr.sin_addr));
                   1031:                        /*
                   1032:                         * locate outgoing interface; if we're the destination,
                   1033:                         * use the incoming interface (should be same).
                   1034:                         */
                   1035:                        if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
                   1036:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
                   1037:                                type = ICMP_UNREACH;
                   1038:                                code = ICMP_UNREACH_HOST;
                   1039:                                goto bad;
                   1040:                        }
1.20      mycroft  1041:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1042:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1043:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1044:                        break;
                   1045:
                   1046:                case IPOPT_TS:
                   1047:                        code = cp - (u_char *)ip;
                   1048:                        ipt = (struct ip_timestamp *)cp;
                   1049:                        if (ipt->ipt_len < 5)
                   1050:                                goto bad;
1.15      cgd      1051:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1       cgd      1052:                                if (++ipt->ipt_oflw == 0)
                   1053:                                        goto bad;
                   1054:                                break;
                   1055:                        }
                   1056:                        sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
                   1057:                        switch (ipt->ipt_flg) {
                   1058:
                   1059:                        case IPOPT_TS_TSONLY:
                   1060:                                break;
                   1061:
                   1062:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1063:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1064:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1065:                                        goto bad;
1.13      mycroft  1066:                                ipaddr.sin_addr = dst;
                   1067:                                ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
                   1068:                                                            m->m_pkthdr.rcvif);
                   1069:                                if (ia == 0)
                   1070:                                        continue;
1.20      mycroft  1071:                                bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1072:                                    (caddr_t)sin, sizeof(struct in_addr));
                   1073:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1074:                                break;
                   1075:
                   1076:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1077:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1078:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1079:                                        goto bad;
                   1080:                                bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
                   1081:                                    sizeof(struct in_addr));
                   1082:                                if (ifa_ifwithaddr((SA)&ipaddr) == 0)
                   1083:                                        continue;
                   1084:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1085:                                break;
                   1086:
                   1087:                        default:
                   1088:                                goto bad;
                   1089:                        }
                   1090:                        ntime = iptime();
                   1091:                        bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
                   1092:                            sizeof(n_time));
                   1093:                        ipt->ipt_ptr += sizeof(n_time);
                   1094:                }
                   1095:        }
                   1096:        if (forward) {
1.26      thorpej  1097:                if (ip_forwsrcrt == 0) {
                   1098:                        type = ICMP_UNREACH;
                   1099:                        code = ICMP_UNREACH_SRCFAIL;
                   1100:                        goto bad;
                   1101:                }
1.1       cgd      1102:                ip_forward(m, 1);
                   1103:                return (1);
1.13      mycroft  1104:        }
                   1105:        return (0);
1.1       cgd      1106: bad:
1.13      mycroft  1107:        icmp_error(m, type, code, 0, 0);
                   1108:        ipstat.ips_badoptions++;
1.1       cgd      1109:        return (1);
                   1110: }
                   1111:
                   1112: /*
                   1113:  * Given address of next destination (final or next hop),
                   1114:  * return internet address info of interface to be used to get there.
                   1115:  */
                   1116: struct in_ifaddr *
                   1117: ip_rtaddr(dst)
                   1118:         struct in_addr dst;
                   1119: {
                   1120:        register struct sockaddr_in *sin;
                   1121:
1.19      mycroft  1122:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1123:
1.35      mycroft  1124:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1125:                if (ipforward_rt.ro_rt) {
                   1126:                        RTFREE(ipforward_rt.ro_rt);
                   1127:                        ipforward_rt.ro_rt = 0;
                   1128:                }
                   1129:                sin->sin_family = AF_INET;
                   1130:                sin->sin_len = sizeof(*sin);
                   1131:                sin->sin_addr = dst;
                   1132:
                   1133:                rtalloc(&ipforward_rt);
                   1134:        }
                   1135:        if (ipforward_rt.ro_rt == 0)
                   1136:                return ((struct in_ifaddr *)0);
1.19      mycroft  1137:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1138: }
                   1139:
                   1140: /*
                   1141:  * Save incoming source route for use in replies,
                   1142:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1143:  */
1.13      mycroft  1144: void
1.1       cgd      1145: save_rte(option, dst)
                   1146:        u_char *option;
                   1147:        struct in_addr dst;
                   1148: {
                   1149:        unsigned olen;
                   1150:
                   1151:        olen = option[IPOPT_OLEN];
                   1152: #ifdef DIAGNOSTIC
                   1153:        if (ipprintfs)
1.39      christos 1154:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1155: #endif /* 0 */
1.1       cgd      1156:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1157:                return;
                   1158:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1159:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1160:        ip_srcrt.dst = dst;
                   1161: }
                   1162:
                   1163: /*
                   1164:  * Retrieve incoming source route for use in replies,
                   1165:  * in the same form used by setsockopt.
                   1166:  * The first hop is placed before the options, will be removed later.
                   1167:  */
                   1168: struct mbuf *
                   1169: ip_srcroute()
                   1170: {
                   1171:        register struct in_addr *p, *q;
                   1172:        register struct mbuf *m;
                   1173:
                   1174:        if (ip_nhops == 0)
                   1175:                return ((struct mbuf *)0);
                   1176:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1177:        if (m == 0)
                   1178:                return ((struct mbuf *)0);
                   1179:
1.13      mycroft  1180: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1181:
                   1182:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1183:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1184:            OPTSIZ;
                   1185: #ifdef DIAGNOSTIC
                   1186:        if (ipprintfs)
1.39      christos 1187:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1188: #endif
                   1189:
                   1190:        /*
                   1191:         * First save first hop for return route
                   1192:         */
                   1193:        p = &ip_srcrt.route[ip_nhops - 1];
                   1194:        *(mtod(m, struct in_addr *)) = *p--;
                   1195: #ifdef DIAGNOSTIC
                   1196:        if (ipprintfs)
1.39      christos 1197:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1198: #endif
                   1199:
                   1200:        /*
                   1201:         * Copy option fields and padding (nop) to mbuf.
                   1202:         */
                   1203:        ip_srcrt.nop = IPOPT_NOP;
                   1204:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1205:        bcopy((caddr_t)&ip_srcrt.nop,
                   1206:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1207:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1208:            sizeof(struct in_addr) + OPTSIZ);
                   1209: #undef OPTSIZ
                   1210:        /*
                   1211:         * Record return path as an IP source route,
                   1212:         * reversing the path (pointers are now aligned).
                   1213:         */
                   1214:        while (p >= ip_srcrt.route) {
                   1215: #ifdef DIAGNOSTIC
                   1216:                if (ipprintfs)
1.39      christos 1217:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1218: #endif
                   1219:                *q++ = *p--;
                   1220:        }
                   1221:        /*
                   1222:         * Last hop goes to final destination.
                   1223:         */
                   1224:        *q = ip_srcrt.dst;
                   1225: #ifdef DIAGNOSTIC
                   1226:        if (ipprintfs)
1.39      christos 1227:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1228: #endif
                   1229:        return (m);
                   1230: }
                   1231:
                   1232: /*
                   1233:  * Strip out IP options, at higher
                   1234:  * level protocol in the kernel.
                   1235:  * Second argument is buffer to which options
                   1236:  * will be moved, and return value is their length.
                   1237:  * XXX should be deleted; last arg currently ignored.
                   1238:  */
1.8       mycroft  1239: void
1.1       cgd      1240: ip_stripoptions(m, mopt)
                   1241:        register struct mbuf *m;
                   1242:        struct mbuf *mopt;
                   1243: {
                   1244:        register int i;
                   1245:        struct ip *ip = mtod(m, struct ip *);
                   1246:        register caddr_t opts;
                   1247:        int olen;
                   1248:
1.79      mycroft  1249:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1250:        opts = (caddr_t)(ip + 1);
                   1251:        i = m->m_len - (sizeof (struct ip) + olen);
                   1252:        bcopy(opts  + olen, opts, (unsigned)i);
                   1253:        m->m_len -= olen;
                   1254:        if (m->m_flags & M_PKTHDR)
                   1255:                m->m_pkthdr.len -= olen;
1.79      mycroft  1256:        ip->ip_len -= olen;
                   1257:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1258: }
                   1259:
1.23      mycroft  1260: int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1261:        0,              0,              0,              0,
                   1262:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1263:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1264:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1265:        0,              0,              0,              0,
                   1266:        ENOPROTOOPT
                   1267: };
                   1268:
                   1269: /*
                   1270:  * Forward a packet.  If some error occurs return the sender
                   1271:  * an icmp packet.  Note we can't always generate a meaningful
                   1272:  * icmp message because icmp doesn't have a large enough repertoire
                   1273:  * of codes and types.
                   1274:  *
                   1275:  * If not forwarding, just drop the packet.  This could be confusing
                   1276:  * if ipforwarding was zero but some routing protocol was advancing
                   1277:  * us as a gateway to somewhere.  However, we must let the routing
                   1278:  * protocol deal with that.
                   1279:  *
                   1280:  * The srcrt parameter indicates whether the packet is being forwarded
                   1281:  * via a source route.
                   1282:  */
1.13      mycroft  1283: void
1.1       cgd      1284: ip_forward(m, srcrt)
                   1285:        struct mbuf *m;
                   1286:        int srcrt;
                   1287: {
                   1288:        register struct ip *ip = mtod(m, struct ip *);
                   1289:        register struct sockaddr_in *sin;
                   1290:        register struct rtentry *rt;
1.28      christos 1291:        int error, type = 0, code = 0;
1.1       cgd      1292:        struct mbuf *mcopy;
1.13      mycroft  1293:        n_long dest;
                   1294:        struct ifnet *destifp;
1.89      itojun   1295: #ifdef IPSEC
                   1296:        struct ifnet dummyifp;
                   1297: #endif
1.1       cgd      1298:
1.13      mycroft  1299:        dest = 0;
1.1       cgd      1300: #ifdef DIAGNOSTIC
                   1301:        if (ipprintfs)
1.70      thorpej  1302:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1303:                    ntohl(ip->ip_src.s_addr),
                   1304:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1305: #endif
                   1306:        if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
                   1307:                ipstat.ips_cantforward++;
                   1308:                m_freem(m);
                   1309:                return;
                   1310:        }
                   1311:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1312:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1313:                return;
                   1314:        }
                   1315:        ip->ip_ttl -= IPTTLDEC;
                   1316:
1.19      mycroft  1317:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1318:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1319:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1320:                if (ipforward_rt.ro_rt) {
                   1321:                        RTFREE(ipforward_rt.ro_rt);
                   1322:                        ipforward_rt.ro_rt = 0;
                   1323:                }
                   1324:                sin->sin_family = AF_INET;
1.35      mycroft  1325:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1326:                sin->sin_addr = ip->ip_dst;
                   1327:
                   1328:                rtalloc(&ipforward_rt);
                   1329:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1330:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1331:                        return;
                   1332:                }
                   1333:                rt = ipforward_rt.ro_rt;
                   1334:        }
                   1335:
                   1336:        /*
1.34      mycroft  1337:         * Save at most 68 bytes of the packet in case
1.1       cgd      1338:         * we need to generate an ICMP message to the src.
                   1339:         */
1.34      mycroft  1340:        mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1       cgd      1341:
                   1342:        /*
                   1343:         * If forwarding packet using same interface that it came in on,
                   1344:         * perhaps should send a redirect to sender to shortcut a hop.
                   1345:         * Only send redirect if source is sending directly to us,
                   1346:         * and if packet was not source routed (or has any options).
                   1347:         * Also, don't send redirect if forwarding using a default route
                   1348:         * or a route modified by a redirect.
                   1349:         */
                   1350:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1351:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1352:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1353:            ipsendredirects && !srcrt) {
1.19      mycroft  1354:                if (rt->rt_ifa &&
                   1355:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1356:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1357:                        if (rt->rt_flags & RTF_GATEWAY)
                   1358:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1359:                        else
                   1360:                                dest = ip->ip_dst.s_addr;
                   1361:                        /*
                   1362:                         * Router requirements says to only send host
                   1363:                         * redirects.
                   1364:                         */
                   1365:                        type = ICMP_REDIRECT;
                   1366:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1367: #ifdef DIAGNOSTIC
1.77      thorpej  1368:                        if (ipprintfs)
                   1369:                                printf("redirect (%d) to %x\n", code,
                   1370:                                    (u_int32_t)dest);
1.1       cgd      1371: #endif
                   1372:                }
                   1373:        }
                   1374:
1.89      itojun   1375: #ifdef IPSEC
                   1376:        m->m_pkthdr.rcvif = NULL;
                   1377: #endif /*IPSEC*/
1.27      thorpej  1378:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1379:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1380:        if (error)
                   1381:                ipstat.ips_cantforward++;
                   1382:        else {
                   1383:                ipstat.ips_forward++;
                   1384:                if (type)
                   1385:                        ipstat.ips_redirectsent++;
                   1386:                else {
1.63      matt     1387:                        if (mcopy) {
                   1388: #ifdef GATEWAY
1.64      thorpej  1389:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1390:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1391: #endif
1.1       cgd      1392:                                m_freem(mcopy);
1.63      matt     1393:                        }
1.1       cgd      1394:                        return;
                   1395:                }
                   1396:        }
                   1397:        if (mcopy == NULL)
                   1398:                return;
1.13      mycroft  1399:        destifp = NULL;
                   1400:
1.1       cgd      1401:        switch (error) {
                   1402:
                   1403:        case 0:                         /* forwarded, but need redirect */
                   1404:                /* type, code set above */
                   1405:                break;
                   1406:
                   1407:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1408:        case EHOSTUNREACH:
                   1409:        case ENETDOWN:
                   1410:        case EHOSTDOWN:
                   1411:        default:
                   1412:                type = ICMP_UNREACH;
                   1413:                code = ICMP_UNREACH_HOST;
                   1414:                break;
                   1415:
                   1416:        case EMSGSIZE:
                   1417:                type = ICMP_UNREACH;
                   1418:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1419: #ifndef IPSEC
1.13      mycroft  1420:                if (ipforward_rt.ro_rt)
                   1421:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1422: #else
                   1423:                /*
                   1424:                 * If the packet is routed over IPsec tunnel, tell the
                   1425:                 * originator the tunnel MTU.
                   1426:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1427:                 * XXX quickhack!!!
                   1428:                 */
                   1429:                if (ipforward_rt.ro_rt) {
                   1430:                        struct secpolicy *sp;
                   1431:                        int ipsecerror;
                   1432:                        int ipsechdr;
                   1433:                        struct route *ro;
                   1434:
                   1435:                        sp = ipsec4_getpolicybyaddr(mcopy,
                   1436:                                                    IP_FORWARDING,
                   1437:                                                    &ipsecerror);
                   1438:
                   1439:                        if (sp == NULL)
                   1440:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1441:                        else {
                   1442:                                /* count IPsec header size */
                   1443:                                ipsechdr = ipsec4_hdrsiz(mcopy, NULL);
                   1444:
                   1445:                                /*
                   1446:                                 * find the correct route for outer IPv4
                   1447:                                 * header, compute tunnel MTU.
                   1448:                                 *
                   1449:                                 * XXX BUG ALERT
                   1450:                                 * The "dummyifp" code relies upon the fact
                   1451:                                 * that icmp_error() touches only ifp->if_mtu.
                   1452:                                 */
                   1453:                                /*XXX*/
                   1454:                                destifp = NULL;
                   1455:                                if (sp->req != NULL
                   1456:                                 && sp->req->sa != NULL) {
                   1457:                                        ro = &sp->req->sa->saidx->sa_route;
                   1458:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1459:                                                dummyifp.if_mtu =
                   1460:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1461:                                                dummyifp.if_mtu -= ipsechdr;
                   1462:                                                destifp = &dummyifp;
                   1463:                                        }
                   1464:                                }
                   1465:
                   1466:                                key_freesp(sp);
                   1467:                        }
                   1468:                }
                   1469: #endif /*IPSEC*/
1.1       cgd      1470:                ipstat.ips_cantfrag++;
                   1471:                break;
                   1472:
                   1473:        case ENOBUFS:
                   1474:                type = ICMP_SOURCEQUENCH;
                   1475:                code = 0;
                   1476:                break;
                   1477:        }
1.13      mycroft  1478:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1479: }
                   1480:
                   1481: void
                   1482: ip_savecontrol(inp, mp, ip, m)
                   1483:        register struct inpcb *inp;
                   1484:        register struct mbuf **mp;
                   1485:        register struct ip *ip;
                   1486:        register struct mbuf *m;
                   1487: {
                   1488:
                   1489:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1490:                struct timeval tv;
                   1491:
                   1492:                microtime(&tv);
                   1493:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1494:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1495:                if (*mp)
                   1496:                        mp = &(*mp)->m_next;
                   1497:        }
                   1498:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1499:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1500:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1501:                if (*mp)
                   1502:                        mp = &(*mp)->m_next;
                   1503:        }
                   1504: #ifdef notyet
                   1505:        /*
                   1506:         * XXX
                   1507:         * Moving these out of udp_input() made them even more broken
                   1508:         * than they already were.
                   1509:         *      - fenner@parc.xerox.com
                   1510:         */
                   1511:        /* options were tossed already */
                   1512:        if (inp->inp_flags & INP_RECVOPTS) {
                   1513:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1514:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1515:                if (*mp)
                   1516:                        mp = &(*mp)->m_next;
                   1517:        }
                   1518:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1519:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1520:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1521:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1522:                if (*mp)
                   1523:                        mp = &(*mp)->m_next;
                   1524:        }
                   1525: #endif
                   1526:        if (inp->inp_flags & INP_RECVIF) {
                   1527:                struct sockaddr_dl sdl;
                   1528:
                   1529:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1530:                sdl.sdl_family = AF_LINK;
                   1531:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1532:                    m->m_pkthdr.rcvif->if_index : 0;
                   1533:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1534:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1535:                    IP_RECVIF, IPPROTO_IP);
                   1536:                if (*mp)
                   1537:                        mp = &(*mp)->m_next;
                   1538:        }
1.13      mycroft  1539: }
                   1540:
                   1541: int
                   1542: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1543:        int *name;
                   1544:        u_int namelen;
                   1545:        void *oldp;
                   1546:        size_t *oldlenp;
                   1547:        void *newp;
                   1548:        size_t newlen;
                   1549: {
1.88      sommerfe 1550:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1551:
1.54      lukem    1552:        int error, old;
                   1553:
1.13      mycroft  1554:        /* All sysctl names at this level are terminal. */
                   1555:        if (namelen != 1)
                   1556:                return (ENOTDIR);
                   1557:
                   1558:        switch (name[0]) {
                   1559:        case IPCTL_FORWARDING:
                   1560:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1561:        case IPCTL_SENDREDIRECTS:
                   1562:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1563:                        &ipsendredirects));
                   1564:        case IPCTL_DEFTTL:
                   1565:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1566: #ifdef notyet
                   1567:        case IPCTL_DEFMTU:
                   1568:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1569: #endif
1.26      thorpej  1570:        case IPCTL_FORWSRCRT:
1.47      cjs      1571:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1572:                if (securelevel > 0)
1.46      cjs      1573:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1574:                            ip_forwsrcrt));
                   1575:                else
                   1576:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1577:                            &ip_forwsrcrt));
1.27      thorpej  1578:        case IPCTL_DIRECTEDBCAST:
                   1579:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1580:                    &ip_directedbcast));
1.47      cjs      1581:        case IPCTL_ALLOWSRCRT:
                   1582:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1583:                    &ip_allowsrcrt));
1.52      thorpej  1584:        case IPCTL_SUBNETSARELOCAL:
                   1585:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1586:                    &subnetsarelocal));
1.53      kml      1587:        case IPCTL_MTUDISC:
1.60      kml      1588:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1589:                    &ip_mtudisc);
                   1590:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
                   1591:                        ip_mtudisc_timeout_q =
                   1592:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1593:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1594:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1595:                        ip_mtudisc_timeout_q = NULL;
                   1596:                }
                   1597:                return error;
1.54      lukem    1598:        case IPCTL_ANONPORTMIN:
                   1599:                old = anonportmin;
                   1600:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
                   1601:                if (anonportmin >= anonportmax || anonportmin > 65535
                   1602: #ifndef IPNOPRIVPORTS
                   1603:                    || anonportmin < IPPORT_RESERVED
                   1604: #endif
                   1605:                    ) {
                   1606:                        anonportmin = old;
                   1607:                        return (EINVAL);
                   1608:                }
                   1609:                return (error);
                   1610:        case IPCTL_ANONPORTMAX:
                   1611:                old = anonportmax;
                   1612:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
                   1613:                if (anonportmin >= anonportmax || anonportmax > 65535
                   1614: #ifndef IPNOPRIVPORTS
                   1615:                    || anonportmax < IPPORT_RESERVED
                   1616: #endif
                   1617:                    ) {
                   1618:                        anonportmax = old;
                   1619:                        return (EINVAL);
                   1620:                }
1.60      kml      1621:                return (error);
                   1622:        case IPCTL_MTUDISCTIMEOUT:
                   1623:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1624:                   &ip_mtudisc_timeout);
                   1625:                if (ip_mtudisc_timeout_q != NULL)
                   1626:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1627:                                              ip_mtudisc_timeout);
1.54      lukem    1628:                return (error);
1.65      matt     1629: #ifdef GATEWAY
                   1630:        case IPCTL_MAXFLOWS:
1.67      thorpej  1631:            {
                   1632:                int s;
                   1633:
1.65      matt     1634:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1635:                   &ip_maxflows);
1.67      thorpej  1636:                s = splsoftnet();
1.65      matt     1637:                ipflow_reap(0);
1.67      thorpej  1638:                splx(s);
1.65      matt     1639:                return (error);
1.67      thorpej  1640:            }
1.89      itojun   1641: #endif
1.90      itojun   1642:        case IPCTL_HOSTZEROBROADCAST:
                   1643:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1644:                    &hostzeroisbroadcast));
1.89      itojun   1645: #if NGIF > 0
                   1646:        case IPCTL_GIF_TTL:
                   1647:                return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1648:                                  &ip_gif_ttl));
1.65      matt     1649: #endif
1.88      sommerfe 1650:
1.13      mycroft  1651:        default:
                   1652:                return (EOPNOTSUPP);
                   1653:        }
                   1654:        /* NOTREACHED */
1.1       cgd      1655: }

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