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Annotation of src/sys/netinet/ip_input.c, Revision 1.82.2.2.2.3

1.82.2.2.2.3! thorpej     1: /*     $NetBSD: ip_input.c,v 1.82.2.2.2.2 1999/07/01 23:47:01 thorpej Exp $    */
1.82.2.2.2.2  thorpej     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"
1.82.2.2.2.3! 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>
1.82.2.2.2.2  thorpej   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 <netkey/key.h>
                    145: #include <netkey/key_debug.h>
                    146: #endif
1.44      thorpej   147:
1.1       cgd       148: #ifndef        IPFORWARDING
                    149: #ifdef GATEWAY
                    150: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    151: #else /* GATEWAY */
                    152: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    153: #endif /* GATEWAY */
                    154: #endif /* IPFORWARDING */
                    155: #ifndef        IPSENDREDIRECTS
                    156: #define        IPSENDREDIRECTS 1
                    157: #endif
1.26      thorpej   158: #ifndef IPFORWSRCRT
1.47      cjs       159: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    160: #endif
                    161: #ifndef IPALLOWSRCRT
1.48      mrg       162: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   163: #endif
1.53      kml       164: #ifndef IPMTUDISC
                    165: #define IPMTUDISC      0
                    166: #endif
1.60      kml       167: #ifndef IPMTUDISCTIMEOUT
1.61      kml       168: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       169: #endif
1.53      kml       170:
1.27      thorpej   171: /*
                    172:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    173:  * configuration using this option will Just Work.
                    174:  */
                    175: #ifndef IPDIRECTEDBCAST
                    176: #ifdef DIRECTED_BROADCAST
                    177: #define IPDIRECTEDBCAST        1
                    178: #else
                    179: #define        IPDIRECTEDBCAST 0
                    180: #endif /* DIRECTED_BROADCAST */
                    181: #endif /* IPDIRECTEDBCAST */
1.1       cgd       182: int    ipforwarding = IPFORWARDING;
                    183: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   184: int    ip_defttl = IPDEFTTL;
1.26      thorpej   185: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   186: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       187: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       188: int    ip_mtudisc = IPMTUDISC;
1.60      kml       189: u_int  ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       190: #ifdef DIAGNOSTIC
                    191: int    ipprintfs = 0;
                    192: #endif
                    193:
1.60      kml       194: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    195:
1.1       cgd       196: extern struct domain inetdomain;
                    197: extern struct protosw inetsw[];
                    198: u_char ip_protox[IPPROTO_MAX];
                    199: int    ipqmaxlen = IFQ_MAXLEN;
1.22      mycroft   200: struct in_ifaddrhead in_ifaddr;
1.57      tls       201: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13      mycroft   202: struct ifqueue ipintrq;
1.63      matt      203: struct ipstat  ipstat;
                    204: u_int16_t      ip_id;
                    205: int    ip_defttl;
1.75      thorpej   206:
1.63      matt      207: struct ipqhead ipq;
1.75      thorpej   208: int    ipq_locked;
                    209:
                    210: static __inline int ipq_lock_try __P((void));
                    211: static __inline void ipq_unlock __P((void));
                    212:
                    213: static __inline int
                    214: ipq_lock_try()
                    215: {
                    216:        int s;
                    217:
                    218:        s = splimp();
                    219:        if (ipq_locked) {
                    220:                splx(s);
                    221:                return (0);
                    222:        }
                    223:        ipq_locked = 1;
                    224:        splx(s);
                    225:        return (1);
                    226: }
                    227:
                    228: static __inline void
                    229: ipq_unlock()
                    230: {
                    231:        int s;
                    232:
                    233:        s = splimp();
                    234:        ipq_locked = 0;
                    235:        splx(s);
                    236: }
                    237:
                    238: #ifdef DIAGNOSTIC
                    239: #define        IPQ_LOCK()                                                      \
                    240: do {                                                                   \
                    241:        if (ipq_lock_try() == 0) {                                      \
                    242:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    243:                panic("ipq_lock");                                      \
                    244:        }                                                               \
                    245: } while (0)
                    246: #define        IPQ_LOCK_CHECK()                                                \
                    247: do {                                                                   \
                    248:        if (ipq_locked == 0) {                                          \
                    249:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    250:                panic("ipq lock check");                                \
                    251:        }                                                               \
                    252: } while (0)
                    253: #else
                    254: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    255: #define        IPQ_LOCK_CHECK()        /* nothing */
                    256: #endif
                    257:
                    258: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       259:
1.72      thorpej   260: struct pool ipqent_pool;
                    261:
1.1       cgd       262: /*
                    263:  * We need to save the IP options in case a protocol wants to respond
                    264:  * to an incoming packet over the same route if the packet got here
                    265:  * using IP source routing.  This allows connection establishment and
                    266:  * maintenance when the remote end is on a network that is not known
                    267:  * to us.
                    268:  */
                    269: int    ip_nhops = 0;
                    270: static struct ip_srcrt {
                    271:        struct  in_addr dst;                    /* final destination */
                    272:        char    nop;                            /* one NOP to align */
                    273:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    274:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    275: } ip_srcrt;
                    276:
1.13      mycroft   277: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   278:
1.1       cgd       279: /*
                    280:  * IP initialization: fill in IP protocol switch table.
                    281:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    282:  */
1.8       mycroft   283: void
1.1       cgd       284: ip_init()
                    285: {
                    286:        register struct protosw *pr;
                    287:        register int i;
                    288:
1.72      thorpej   289:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    290:            0, NULL, NULL, M_IPQ);
                    291:
1.1       cgd       292:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    293:        if (pr == 0)
                    294:                panic("ip_init");
                    295:        for (i = 0; i < IPPROTO_MAX; i++)
                    296:                ip_protox[i] = pr - inetsw;
                    297:        for (pr = inetdomain.dom_protosw;
                    298:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    299:                if (pr->pr_domain->dom_family == PF_INET &&
                    300:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    301:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       302:        LIST_INIT(&ipq);
1.1       cgd       303:        ip_id = time.tv_sec & 0xffff;
                    304:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   305:        TAILQ_INIT(&in_ifaddr);
1.57      tls       306:        in_ifaddrhashtbl =
                    307:            hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60      kml       308:        if (ip_mtudisc != 0)
                    309:                ip_mtudisc_timeout_q =
                    310:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   311: #ifdef GATEWAY
                    312:        ipflow_init();
                    313: #endif
1.1       cgd       314: }
                    315:
                    316: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    317: struct route ipforward_rt;
                    318:
                    319: /*
1.82.2.2.2.2  thorpej   320:  * IP software interrupt routine
                    321:  */
                    322: void
                    323: ipintr()
                    324: {
                    325:        int s;
                    326:        struct mbuf *m;
                    327:
                    328:        while (1) {
                    329:                s = splimp();
                    330:                IF_DEQUEUE(&ipintrq, m);
                    331:                splx(s);
                    332:                if (m == 0)
                    333:                        return;
                    334:                ip_input(m);
                    335:        }
                    336: }
                    337:
                    338: /*
1.1       cgd       339:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    340:  * try to reassemble.  Process options.  Pass to next level.
                    341:  */
1.8       mycroft   342: void
1.82.2.2.2.2  thorpej   343: ip_input(struct mbuf *m)
1.1       cgd       344: {
1.33      mrg       345:        register struct ip *ip = NULL;
1.1       cgd       346:        register struct ipq *fp;
                    347:        register struct in_ifaddr *ia;
1.57      tls       348:        register struct ifaddr *ifa;
1.25      cgd       349:        struct ipqent *ipqe;
1.82.2.2.2.2  thorpej   350:        int hlen = 0, mff, len;
1.36      mrg       351: #ifdef PFIL_HOOKS
1.33      mrg       352:        struct packet_filter_hook *pfh;
                    353:        struct mbuf *m0;
1.43      mrg       354:        int rv;
1.36      mrg       355: #endif /* PFIL_HOOKS */
1.1       cgd       356:
                    357: #ifdef DIAGNOSTIC
                    358:        if ((m->m_flags & M_PKTHDR) == 0)
                    359:                panic("ipintr no HDR");
                    360: #endif
1.82.2.2.2.2  thorpej   361: #ifdef IPSEC
                    362:        /*
                    363:         * should the inner packet be considered authentic?
                    364:         * see comment in ah4_input().
                    365:         */
                    366:        if (m) {
                    367:                m->m_flags &= ~M_AUTHIPHDR;
                    368:                m->m_flags &= ~M_AUTHIPDGM;
                    369:        }
                    370: #endif
1.1       cgd       371:        /*
                    372:         * If no IP addresses have been set yet but the interfaces
                    373:         * are receiving, can't do anything with incoming packets yet.
                    374:         */
1.22      mycroft   375:        if (in_ifaddr.tqh_first == 0)
1.1       cgd       376:                goto bad;
                    377:        ipstat.ips_total++;
                    378:        if (m->m_len < sizeof (struct ip) &&
                    379:            (m = m_pullup(m, sizeof (struct ip))) == 0) {
                    380:                ipstat.ips_toosmall++;
1.82.2.2.2.2  thorpej   381:                return;
1.1       cgd       382:        }
                    383:        ip = mtod(m, struct ip *);
1.13      mycroft   384:        if (ip->ip_v != IPVERSION) {
                    385:                ipstat.ips_badvers++;
                    386:                goto bad;
                    387:        }
1.1       cgd       388:        hlen = ip->ip_hl << 2;
                    389:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    390:                ipstat.ips_badhlen++;
                    391:                goto bad;
                    392:        }
                    393:        if (hlen > m->m_len) {
                    394:                if ((m = m_pullup(m, hlen)) == 0) {
                    395:                        ipstat.ips_badhlen++;
1.82.2.2.2.2  thorpej   396:                        return;
1.1       cgd       397:                }
                    398:                ip = mtod(m, struct ip *);
                    399:        }
1.82.2.2.2.1  thorpej   400:        /*
                    401:         * we drop packets that have a multicast address as source
                    402:         * as wanted by rfc 1112
                    403:         */
                    404:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
                    405:                goto bad;
                    406:        }
                    407:
1.78      mycroft   408:        if (in_cksum(m, hlen) != 0) {
1.1       cgd       409:                ipstat.ips_badsum++;
                    410:                goto bad;
                    411:        }
                    412:
                    413:        /*
                    414:         * Convert fields to host representation.
                    415:         */
                    416:        NTOHS(ip->ip_len);
                    417:        NTOHS(ip->ip_off);
1.35      mycroft   418:        len = ip->ip_len;
1.81      proff     419:
                    420:        /*
                    421:         * Check for additional length bogosity
                    422:         */
1.82.2.2.2.1  thorpej   423:        if (len < hlen) {
1.81      proff     424:                ipstat.ips_badlen++;
                    425:                goto bad;
                    426:        }
1.1       cgd       427:
                    428:        /*
                    429:         * Check that the amount of data in the buffers
                    430:         * is as at least much as the IP header would have us expect.
                    431:         * Trim mbufs if longer than we expect.
                    432:         * Drop packet if shorter than we expect.
                    433:         */
1.35      mycroft   434:        if (m->m_pkthdr.len < len) {
1.1       cgd       435:                ipstat.ips_tooshort++;
                    436:                goto bad;
                    437:        }
1.35      mycroft   438:        if (m->m_pkthdr.len > len) {
1.1       cgd       439:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   440:                        m->m_len = len;
                    441:                        m->m_pkthdr.len = len;
1.1       cgd       442:                } else
1.35      mycroft   443:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       444:        }
                    445:
1.64      thorpej   446:        /*
                    447:         * Assume that we can create a fast-forward IP flow entry
                    448:         * based on this packet.
                    449:         */
                    450:        m->m_flags |= M_CANFASTFWD;
                    451:
1.36      mrg       452: #ifdef PFIL_HOOKS
1.33      mrg       453:        /*
1.64      thorpej   454:         * Run through list of hooks for input packets.  If there are any
                    455:         * filters which require that additional packets in the flow are
                    456:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    457:         * Note that filters must _never_ set this flag, as another filter
                    458:         * in the list may have previously cleared it.
1.33      mrg       459:         */
                    460:        m0 = m;
1.59      mrg       461:        for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next)
1.33      mrg       462:                if (pfh->pfil_func) {
1.43      mrg       463:                        rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
                    464:                        if (rv)
1.82.2.2.2.2  thorpej   465:                                return;
1.68      sommerfe  466:                        m = m0;
                    467:                        if (m == NULL)
1.82.2.2.2.2  thorpej   468:                                return;
1.68      sommerfe  469:                        ip = mtod(m, struct ip *);
1.33      mrg       470:                }
1.36      mrg       471: #endif /* PFIL_HOOKS */
1.33      mrg       472:
1.1       cgd       473:        /*
                    474:         * Process options and, if not destined for us,
                    475:         * ship it on.  ip_dooptions returns 1 when an
                    476:         * error was detected (causing an icmp message
                    477:         * to be sent and the original packet to be freed).
                    478:         */
                    479:        ip_nhops = 0;           /* for source routed packets */
                    480:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.82.2.2.2.2  thorpej   481:                return;
1.1       cgd       482:
                    483:        /*
                    484:         * Check our list of addresses, to see if the packet is for us.
                    485:         */
1.57      tls       486:        INADDR_TO_IA(ip->ip_dst, ia);
1.82.2.2  perry     487:        if (ia != NULL)
                    488:                goto ours;
1.57      tls       489:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
                    490:                for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    491:                    ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
                    492:                        if (ifa->ifa_addr->sa_family != AF_INET) continue;
                    493:                        ia = ifatoia(ifa);
1.35      mycroft   494:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    495:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   496:                            /*
                    497:                             * Look for all-0's host part (old broadcast addr),
                    498:                             * either for subnet or net.
                    499:                             */
                    500:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   501:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       502:                                goto ours;
1.57      tls       503:                        /*
                    504:                         * An interface with IP address zero accepts
                    505:                         * all packets that arrive on that interface.
                    506:                         */
                    507:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    508:                                goto ours;
1.1       cgd       509:                }
                    510:        }
1.18      mycroft   511:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   512:                struct in_multi *inm;
                    513: #ifdef MROUTING
                    514:                extern struct socket *ip_mrouter;
1.10      brezak    515:
                    516:                if (m->m_flags & M_EXT) {
                    517:                        if ((m = m_pullup(m, hlen)) == 0) {
                    518:                                ipstat.ips_toosmall++;
1.82.2.2.2.2  thorpej   519:                                return;
1.10      brezak    520:                        }
                    521:                        ip = mtod(m, struct ip *);
                    522:                }
1.4       hpeyerl   523:
                    524:                if (ip_mrouter) {
                    525:                        /*
                    526:                         * If we are acting as a multicast router, all
                    527:                         * incoming multicast packets are passed to the
                    528:                         * kernel-level multicast forwarding function.
                    529:                         * The packet is returned (relatively) intact; if
                    530:                         * ip_mforward() returns a non-zero value, the packet
                    531:                         * must be discarded, else it may be accepted below.
                    532:                         *
                    533:                         * (The IP ident field is put in the same byte order
                    534:                         * as expected when ip_mforward() is called from
                    535:                         * ip_output().)
                    536:                         */
1.13      mycroft   537:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    538:                                ipstat.ips_cantforward++;
1.4       hpeyerl   539:                                m_freem(m);
1.82.2.2.2.2  thorpej   540:                                return;
1.4       hpeyerl   541:                        }
                    542:
                    543:                        /*
                    544:                         * The process-level routing demon needs to receive
                    545:                         * all multicast IGMP packets, whether or not this
                    546:                         * host belongs to their destination groups.
                    547:                         */
                    548:                        if (ip->ip_p == IPPROTO_IGMP)
                    549:                                goto ours;
1.13      mycroft   550:                        ipstat.ips_forward++;
1.4       hpeyerl   551:                }
                    552: #endif
                    553:                /*
                    554:                 * See if we belong to the destination multicast group on the
                    555:                 * arrival interface.
                    556:                 */
                    557:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    558:                if (inm == NULL) {
1.13      mycroft   559:                        ipstat.ips_cantforward++;
1.4       hpeyerl   560:                        m_freem(m);
1.82.2.2.2.2  thorpej   561:                        return;
1.4       hpeyerl   562:                }
                    563:                goto ours;
                    564:        }
1.19      mycroft   565:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   566:            in_nullhost(ip->ip_dst))
1.1       cgd       567:                goto ours;
                    568:
                    569:        /*
                    570:         * Not for us; forward if possible and desirable.
                    571:         */
                    572:        if (ipforwarding == 0) {
                    573:                ipstat.ips_cantforward++;
                    574:                m_freem(m);
                    575:        } else
                    576:                ip_forward(m, 0);
1.82.2.2.2.2  thorpej   577:        return;
1.1       cgd       578:
                    579: ours:
                    580:        /*
                    581:         * If offset or IP_MF are set, must reassemble.
                    582:         * Otherwise, nothing need be done.
                    583:         * (We could look in the reassembly queue to see
                    584:         * if the packet was previously fragmented,
                    585:         * but it's not worth the time; just let them time out.)
                    586:         */
1.37      perry     587:        if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1       cgd       588:                /*
                    589:                 * Look for queue of fragments
                    590:                 * of this datagram.
                    591:                 */
1.75      thorpej   592:                IPQ_LOCK();
1.25      cgd       593:                for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1       cgd       594:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   595:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    596:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       597:                            ip->ip_p == fp->ipq_p)
                    598:                                goto found;
                    599:                fp = 0;
                    600: found:
                    601:
                    602:                /*
                    603:                 * Adjust ip_len to not reflect header,
1.25      cgd       604:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       605:                 * convert offset of this to bytes.
                    606:                 */
                    607:                ip->ip_len -= hlen;
1.25      cgd       608:                mff = (ip->ip_off & IP_MF) != 0;
                    609:                if (mff) {
1.16      cgd       610:                        /*
                    611:                         * Make sure that fragments have a data length
                    612:                         * that's a non-zero multiple of 8 bytes.
                    613:                         */
1.17      cgd       614:                        if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16      cgd       615:                                ipstat.ips_badfrags++;
1.75      thorpej   616:                                IPQ_UNLOCK();
1.16      cgd       617:                                goto bad;
                    618:                        }
                    619:                }
1.1       cgd       620:                ip->ip_off <<= 3;
                    621:
                    622:                /*
                    623:                 * If datagram marked as having more fragments
                    624:                 * or if this is not the first fragment,
                    625:                 * attempt reassembly; if it succeeds, proceed.
                    626:                 */
1.25      cgd       627:                if (mff || ip->ip_off) {
1.1       cgd       628:                        ipstat.ips_fragments++;
1.72      thorpej   629:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       630:                        if (ipqe == NULL) {
                    631:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   632:                                IPQ_UNLOCK();
1.25      cgd       633:                                goto bad;
                    634:                        }
                    635:                        ipqe->ipqe_mff = mff;
1.50      thorpej   636:                        ipqe->ipqe_m = m;
1.25      cgd       637:                        ipqe->ipqe_ip = ip;
1.50      thorpej   638:                        m = ip_reass(ipqe, fp);
1.75      thorpej   639:                        if (m == 0) {
                    640:                                IPQ_UNLOCK();
1.82.2.2.2.2  thorpej   641:                                return;
1.75      thorpej   642:                        }
1.13      mycroft   643:                        ipstat.ips_reassembled++;
1.50      thorpej   644:                        ip = mtod(m, struct ip *);
1.74      thorpej   645:                        hlen = ip->ip_hl << 2;
1.79      mycroft   646:                        ip->ip_len += hlen;
1.1       cgd       647:                } else
                    648:                        if (fp)
                    649:                                ip_freef(fp);
1.75      thorpej   650:                IPQ_UNLOCK();
1.79      mycroft   651:        }
1.1       cgd       652:
                    653:        /*
                    654:         * Switch out to protocol's input routine.
                    655:         */
1.82      aidan     656: #if IFA_STATS
                    657:        ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
                    658: #endif
1.1       cgd       659:        ipstat.ips_delivered++;
1.82.2.2.2.2  thorpej   660:     {
                    661:        int off = hlen, nh = ip->ip_p;
                    662:
                    663:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    664:        return;
                    665:     }
1.1       cgd       666: bad:
                    667:        m_freem(m);
                    668: }
                    669:
                    670: /*
                    671:  * Take incoming datagram fragment and try to
                    672:  * reassemble it into whole datagram.  If a chain for
                    673:  * reassembly of this datagram already exists, then it
                    674:  * is given as fp; otherwise have to make a chain.
                    675:  */
1.50      thorpej   676: struct mbuf *
1.25      cgd       677: ip_reass(ipqe, fp)
                    678:        register struct ipqent *ipqe;
1.1       cgd       679:        register struct ipq *fp;
                    680: {
1.50      thorpej   681:        register struct mbuf *m = ipqe->ipqe_m;
1.25      cgd       682:        register struct ipqent *nq, *p, *q;
                    683:        struct ip *ip;
1.1       cgd       684:        struct mbuf *t;
1.25      cgd       685:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       686:        int i, next;
                    687:
1.75      thorpej   688:        IPQ_LOCK_CHECK();
                    689:
1.1       cgd       690:        /*
                    691:         * Presence of header sizes in mbufs
                    692:         * would confuse code below.
                    693:         */
                    694:        m->m_data += hlen;
                    695:        m->m_len -= hlen;
                    696:
                    697:        /*
                    698:         * If first fragment to arrive, create a reassembly queue.
                    699:         */
                    700:        if (fp == 0) {
1.50      thorpej   701:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    702:                    M_FTABLE, M_NOWAIT);
                    703:                if (fp == NULL)
1.1       cgd       704:                        goto dropfrag;
1.25      cgd       705:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       706:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       707:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    708:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
                    709:                LIST_INIT(&fp->ipq_fragq);
                    710:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    711:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    712:                p = NULL;
1.1       cgd       713:                goto insert;
                    714:        }
                    715:
                    716:        /*
                    717:         * Find a segment which begins after this one does.
                    718:         */
1.25      cgd       719:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    720:            p = q, q = q->ipqe_q.le_next)
                    721:                if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1       cgd       722:                        break;
                    723:
                    724:        /*
                    725:         * If there is a preceding segment, it may provide some of
                    726:         * our data already.  If so, drop the data from the incoming
                    727:         * segment.  If it provides all of our data, drop us.
                    728:         */
1.25      cgd       729:        if (p != NULL) {
                    730:                i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
                    731:                    ipqe->ipqe_ip->ip_off;
1.1       cgd       732:                if (i > 0) {
1.25      cgd       733:                        if (i >= ipqe->ipqe_ip->ip_len)
1.1       cgd       734:                                goto dropfrag;
1.50      thorpej   735:                        m_adj(ipqe->ipqe_m, i);
1.25      cgd       736:                        ipqe->ipqe_ip->ip_off += i;
                    737:                        ipqe->ipqe_ip->ip_len -= i;
1.1       cgd       738:                }
                    739:        }
                    740:
                    741:        /*
                    742:         * While we overlap succeeding segments trim them or,
                    743:         * if they are completely covered, dequeue them.
                    744:         */
1.25      cgd       745:        for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
                    746:            q->ipqe_ip->ip_off; q = nq) {
                    747:                i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
                    748:                    q->ipqe_ip->ip_off;
                    749:                if (i < q->ipqe_ip->ip_len) {
                    750:                        q->ipqe_ip->ip_len -= i;
                    751:                        q->ipqe_ip->ip_off += i;
1.50      thorpej   752:                        m_adj(q->ipqe_m, i);
1.1       cgd       753:                        break;
                    754:                }
1.25      cgd       755:                nq = q->ipqe_q.le_next;
1.50      thorpej   756:                m_freem(q->ipqe_m);
1.25      cgd       757:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   758:                pool_put(&ipqent_pool, q);
1.1       cgd       759:        }
                    760:
                    761: insert:
                    762:        /*
                    763:         * Stick new segment in its place;
                    764:         * check for complete reassembly.
                    765:         */
1.25      cgd       766:        if (p == NULL) {
                    767:                LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
                    768:        } else {
                    769:                LIST_INSERT_AFTER(p, ipqe, ipqe_q);
                    770:        }
1.1       cgd       771:        next = 0;
1.25      cgd       772:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    773:            p = q, q = q->ipqe_q.le_next) {
                    774:                if (q->ipqe_ip->ip_off != next)
1.1       cgd       775:                        return (0);
1.25      cgd       776:                next += q->ipqe_ip->ip_len;
1.1       cgd       777:        }
1.25      cgd       778:        if (p->ipqe_mff)
1.1       cgd       779:                return (0);
                    780:
                    781:        /*
1.41      thorpej   782:         * Reassembly is complete.  Check for a bogus message size and
                    783:         * concatenate fragments.
1.1       cgd       784:         */
1.25      cgd       785:        q = fp->ipq_fragq.lh_first;
                    786:        ip = q->ipqe_ip;
1.41      thorpej   787:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    788:                ipstat.ips_toolong++;
                    789:                ip_freef(fp);
                    790:                return (0);
                    791:        }
1.50      thorpej   792:        m = q->ipqe_m;
1.1       cgd       793:        t = m->m_next;
                    794:        m->m_next = 0;
                    795:        m_cat(m, t);
1.25      cgd       796:        nq = q->ipqe_q.le_next;
1.72      thorpej   797:        pool_put(&ipqent_pool, q);
1.25      cgd       798:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   799:                t = q->ipqe_m;
1.25      cgd       800:                nq = q->ipqe_q.le_next;
1.72      thorpej   801:                pool_put(&ipqent_pool, q);
1.1       cgd       802:                m_cat(m, t);
                    803:        }
                    804:
                    805:        /*
                    806:         * Create header for new ip packet by
                    807:         * modifying header of first packet;
                    808:         * dequeue and discard fragment reassembly header.
                    809:         * Make header visible.
                    810:         */
                    811:        ip->ip_len = next;
1.82.2.2.2.2  thorpej   812:        ip->ip_ttl = 0; /* xxx */
                    813:        ip->ip_sum = 0;
1.25      cgd       814:        ip->ip_src = fp->ipq_src;
                    815:        ip->ip_dst = fp->ipq_dst;
                    816:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   817:        FREE(fp, M_FTABLE);
1.1       cgd       818:        m->m_len += (ip->ip_hl << 2);
                    819:        m->m_data -= (ip->ip_hl << 2);
                    820:        /* some debugging cruft by sklower, below, will go away soon */
                    821:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
                    822:                register int plen = 0;
1.50      thorpej   823:                for (t = m; t; t = t->m_next)
                    824:                        plen += t->m_len;
                    825:                m->m_pkthdr.len = plen;
1.1       cgd       826:        }
1.50      thorpej   827:        return (m);
1.1       cgd       828:
                    829: dropfrag:
                    830:        ipstat.ips_fragdropped++;
                    831:        m_freem(m);
1.72      thorpej   832:        pool_put(&ipqent_pool, ipqe);
1.1       cgd       833:        return (0);
                    834: }
                    835:
                    836: /*
                    837:  * Free a fragment reassembly header and all
                    838:  * associated datagrams.
                    839:  */
1.8       mycroft   840: void
1.1       cgd       841: ip_freef(fp)
                    842:        struct ipq *fp;
                    843: {
1.25      cgd       844:        register struct ipqent *q, *p;
1.1       cgd       845:
1.75      thorpej   846:        IPQ_LOCK_CHECK();
                    847:
1.25      cgd       848:        for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
                    849:                p = q->ipqe_q.le_next;
1.50      thorpej   850:                m_freem(q->ipqe_m);
1.25      cgd       851:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   852:                pool_put(&ipqent_pool, q);
1.1       cgd       853:        }
1.25      cgd       854:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   855:        FREE(fp, M_FTABLE);
1.1       cgd       856: }
                    857:
                    858: /*
                    859:  * IP timer processing;
                    860:  * if a timer expires on a reassembly
                    861:  * queue, discard it.
                    862:  */
1.8       mycroft   863: void
1.1       cgd       864: ip_slowtimo()
                    865: {
1.25      cgd       866:        register struct ipq *fp, *nfp;
1.24      mycroft   867:        int s = splsoftnet();
1.1       cgd       868:
1.75      thorpej   869:        IPQ_LOCK();
1.25      cgd       870:        for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
                    871:                nfp = fp->ipq_q.le_next;
                    872:                if (--fp->ipq_ttl == 0) {
1.1       cgd       873:                        ipstat.ips_fragtimeout++;
1.25      cgd       874:                        ip_freef(fp);
1.1       cgd       875:                }
                    876:        }
1.75      thorpej   877:        IPQ_UNLOCK();
1.63      matt      878: #ifdef GATEWAY
                    879:        ipflow_slowtimo();
                    880: #endif
1.1       cgd       881:        splx(s);
                    882: }
                    883:
                    884: /*
                    885:  * Drain off all datagram fragments.
                    886:  */
1.8       mycroft   887: void
1.1       cgd       888: ip_drain()
                    889: {
                    890:
1.75      thorpej   891:        /*
                    892:         * We may be called from a device's interrupt context.  If
                    893:         * the ipq is already busy, just bail out now.
                    894:         */
                    895:        if (ipq_lock_try() == 0)
                    896:                return;
                    897:
1.25      cgd       898:        while (ipq.lh_first != NULL) {
1.1       cgd       899:                ipstat.ips_fragdropped++;
1.25      cgd       900:                ip_freef(ipq.lh_first);
1.1       cgd       901:        }
1.75      thorpej   902:
                    903:        IPQ_UNLOCK();
1.1       cgd       904: }
                    905:
                    906: /*
                    907:  * Do option processing on a datagram,
                    908:  * possibly discarding it if bad options are encountered,
                    909:  * or forwarding it if source-routed.
                    910:  * Returns 1 if packet has been forwarded/freed,
                    911:  * 0 if the packet should be processed further.
                    912:  */
1.8       mycroft   913: int
1.1       cgd       914: ip_dooptions(m)
                    915:        struct mbuf *m;
                    916: {
                    917:        register struct ip *ip = mtod(m, struct ip *);
                    918:        register u_char *cp;
                    919:        register struct ip_timestamp *ipt;
                    920:        register struct in_ifaddr *ia;
                    921:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13      mycroft   922:        struct in_addr *sin, dst;
1.1       cgd       923:        n_time ntime;
                    924:
1.13      mycroft   925:        dst = ip->ip_dst;
1.1       cgd       926:        cp = (u_char *)(ip + 1);
                    927:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    928:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    929:                opt = cp[IPOPT_OPTVAL];
                    930:                if (opt == IPOPT_EOL)
                    931:                        break;
                    932:                if (opt == IPOPT_NOP)
                    933:                        optlen = 1;
                    934:                else {
                    935:                        optlen = cp[IPOPT_OLEN];
                    936:                        if (optlen <= 0 || optlen > cnt) {
                    937:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    938:                                goto bad;
                    939:                        }
                    940:                }
                    941:                switch (opt) {
                    942:
                    943:                default:
                    944:                        break;
                    945:
                    946:                /*
                    947:                 * Source routing with record.
                    948:                 * Find interface with current destination address.
                    949:                 * If none on this machine then drop if strictly routed,
                    950:                 * or do nothing if loosely routed.
                    951:                 * Record interface address and bring up next address
                    952:                 * component.  If strictly routed make sure next
                    953:                 * address is on directly accessible net.
                    954:                 */
                    955:                case IPOPT_LSRR:
                    956:                case IPOPT_SSRR:
1.47      cjs       957:                        if (ip_allowsrcrt == 0) {
                    958:                                type = ICMP_UNREACH;
                    959:                                code = ICMP_UNREACH_NET_PROHIB;
                    960:                                goto bad;
                    961:                        }
1.1       cgd       962:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    963:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    964:                                goto bad;
                    965:                        }
                    966:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   967:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       968:                        if (ia == 0) {
                    969:                                if (opt == IPOPT_SSRR) {
                    970:                                        type = ICMP_UNREACH;
                    971:                                        code = ICMP_UNREACH_SRCFAIL;
                    972:                                        goto bad;
                    973:                                }
                    974:                                /*
                    975:                                 * Loose routing, and not at next destination
                    976:                                 * yet; nothing to do except forward.
                    977:                                 */
                    978:                                break;
                    979:                        }
                    980:                        off--;                  /* 0 origin */
                    981:                        if (off > optlen - sizeof(struct in_addr)) {
                    982:                                /*
                    983:                                 * End of source route.  Should be for us.
                    984:                                 */
                    985:                                save_rte(cp, ip->ip_src);
                    986:                                break;
                    987:                        }
                    988:                        /*
                    989:                         * locate outgoing interface
                    990:                         */
                    991:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                    992:                            sizeof(ipaddr.sin_addr));
                    993:                        if (opt == IPOPT_SSRR) {
                    994: #define        INA     struct in_ifaddr *
                    995: #define        SA      struct sockaddr *
1.29      mrg       996:                            ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1       cgd       997:                        } else
                    998:                                ia = ip_rtaddr(ipaddr.sin_addr);
                    999:                        if (ia == 0) {
                   1000:                                type = ICMP_UNREACH;
                   1001:                                code = ICMP_UNREACH_SRCFAIL;
                   1002:                                goto bad;
                   1003:                        }
                   1004:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1005:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1006:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1007:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1008:                        /*
                   1009:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1010:                         */
1.18      mycroft  1011:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1012:                        break;
                   1013:
                   1014:                case IPOPT_RR:
                   1015:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1016:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1017:                                goto bad;
                   1018:                        }
                   1019:                        /*
                   1020:                         * If no space remains, ignore.
                   1021:                         */
                   1022:                        off--;                  /* 0 origin */
                   1023:                        if (off > optlen - sizeof(struct in_addr))
                   1024:                                break;
                   1025:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1026:                            sizeof(ipaddr.sin_addr));
                   1027:                        /*
                   1028:                         * locate outgoing interface; if we're the destination,
                   1029:                         * use the incoming interface (should be same).
                   1030:                         */
                   1031:                        if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
                   1032:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
                   1033:                                type = ICMP_UNREACH;
                   1034:                                code = ICMP_UNREACH_HOST;
                   1035:                                goto bad;
                   1036:                        }
1.20      mycroft  1037:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1038:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1039:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1040:                        break;
                   1041:
                   1042:                case IPOPT_TS:
                   1043:                        code = cp - (u_char *)ip;
                   1044:                        ipt = (struct ip_timestamp *)cp;
                   1045:                        if (ipt->ipt_len < 5)
                   1046:                                goto bad;
1.15      cgd      1047:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1       cgd      1048:                                if (++ipt->ipt_oflw == 0)
                   1049:                                        goto bad;
                   1050:                                break;
                   1051:                        }
                   1052:                        sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
                   1053:                        switch (ipt->ipt_flg) {
                   1054:
                   1055:                        case IPOPT_TS_TSONLY:
                   1056:                                break;
                   1057:
                   1058:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1059:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1060:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1061:                                        goto bad;
1.13      mycroft  1062:                                ipaddr.sin_addr = dst;
                   1063:                                ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
                   1064:                                                            m->m_pkthdr.rcvif);
                   1065:                                if (ia == 0)
                   1066:                                        continue;
1.20      mycroft  1067:                                bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1068:                                    (caddr_t)sin, sizeof(struct in_addr));
                   1069:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1070:                                break;
                   1071:
                   1072:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1073:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1       cgd      1074:                                    sizeof(struct in_addr) > ipt->ipt_len)
                   1075:                                        goto bad;
                   1076:                                bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
                   1077:                                    sizeof(struct in_addr));
                   1078:                                if (ifa_ifwithaddr((SA)&ipaddr) == 0)
                   1079:                                        continue;
                   1080:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1081:                                break;
                   1082:
                   1083:                        default:
                   1084:                                goto bad;
                   1085:                        }
                   1086:                        ntime = iptime();
                   1087:                        bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
                   1088:                            sizeof(n_time));
                   1089:                        ipt->ipt_ptr += sizeof(n_time);
                   1090:                }
                   1091:        }
                   1092:        if (forward) {
1.26      thorpej  1093:                if (ip_forwsrcrt == 0) {
                   1094:                        type = ICMP_UNREACH;
                   1095:                        code = ICMP_UNREACH_SRCFAIL;
                   1096:                        goto bad;
                   1097:                }
1.1       cgd      1098:                ip_forward(m, 1);
                   1099:                return (1);
1.13      mycroft  1100:        }
                   1101:        return (0);
1.1       cgd      1102: bad:
1.13      mycroft  1103:        icmp_error(m, type, code, 0, 0);
                   1104:        ipstat.ips_badoptions++;
1.1       cgd      1105:        return (1);
                   1106: }
                   1107:
                   1108: /*
                   1109:  * Given address of next destination (final or next hop),
                   1110:  * return internet address info of interface to be used to get there.
                   1111:  */
                   1112: struct in_ifaddr *
                   1113: ip_rtaddr(dst)
                   1114:         struct in_addr dst;
                   1115: {
                   1116:        register struct sockaddr_in *sin;
                   1117:
1.19      mycroft  1118:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1119:
1.35      mycroft  1120:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1121:                if (ipforward_rt.ro_rt) {
                   1122:                        RTFREE(ipforward_rt.ro_rt);
                   1123:                        ipforward_rt.ro_rt = 0;
                   1124:                }
                   1125:                sin->sin_family = AF_INET;
                   1126:                sin->sin_len = sizeof(*sin);
                   1127:                sin->sin_addr = dst;
                   1128:
                   1129:                rtalloc(&ipforward_rt);
                   1130:        }
                   1131:        if (ipforward_rt.ro_rt == 0)
                   1132:                return ((struct in_ifaddr *)0);
1.19      mycroft  1133:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1134: }
                   1135:
                   1136: /*
                   1137:  * Save incoming source route for use in replies,
                   1138:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1139:  */
1.13      mycroft  1140: void
1.1       cgd      1141: save_rte(option, dst)
                   1142:        u_char *option;
                   1143:        struct in_addr dst;
                   1144: {
                   1145:        unsigned olen;
                   1146:
                   1147:        olen = option[IPOPT_OLEN];
                   1148: #ifdef DIAGNOSTIC
                   1149:        if (ipprintfs)
1.39      christos 1150:                printf("save_rte: olen %d\n", olen);
1.82.2.2.2.2  thorpej  1151: #endif /* 0 */
1.1       cgd      1152:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1153:                return;
                   1154:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1155:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1156:        ip_srcrt.dst = dst;
                   1157: }
                   1158:
                   1159: /*
                   1160:  * Retrieve incoming source route for use in replies,
                   1161:  * in the same form used by setsockopt.
                   1162:  * The first hop is placed before the options, will be removed later.
                   1163:  */
                   1164: struct mbuf *
                   1165: ip_srcroute()
                   1166: {
                   1167:        register struct in_addr *p, *q;
                   1168:        register struct mbuf *m;
                   1169:
                   1170:        if (ip_nhops == 0)
                   1171:                return ((struct mbuf *)0);
                   1172:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1173:        if (m == 0)
                   1174:                return ((struct mbuf *)0);
                   1175:
1.13      mycroft  1176: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1177:
                   1178:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1179:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1180:            OPTSIZ;
                   1181: #ifdef DIAGNOSTIC
                   1182:        if (ipprintfs)
1.39      christos 1183:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1184: #endif
                   1185:
                   1186:        /*
                   1187:         * First save first hop for return route
                   1188:         */
                   1189:        p = &ip_srcrt.route[ip_nhops - 1];
                   1190:        *(mtod(m, struct in_addr *)) = *p--;
                   1191: #ifdef DIAGNOSTIC
                   1192:        if (ipprintfs)
1.39      christos 1193:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1194: #endif
                   1195:
                   1196:        /*
                   1197:         * Copy option fields and padding (nop) to mbuf.
                   1198:         */
                   1199:        ip_srcrt.nop = IPOPT_NOP;
                   1200:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1201:        bcopy((caddr_t)&ip_srcrt.nop,
                   1202:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1203:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1204:            sizeof(struct in_addr) + OPTSIZ);
                   1205: #undef OPTSIZ
                   1206:        /*
                   1207:         * Record return path as an IP source route,
                   1208:         * reversing the path (pointers are now aligned).
                   1209:         */
                   1210:        while (p >= ip_srcrt.route) {
                   1211: #ifdef DIAGNOSTIC
                   1212:                if (ipprintfs)
1.39      christos 1213:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1214: #endif
                   1215:                *q++ = *p--;
                   1216:        }
                   1217:        /*
                   1218:         * Last hop goes to final destination.
                   1219:         */
                   1220:        *q = ip_srcrt.dst;
                   1221: #ifdef DIAGNOSTIC
                   1222:        if (ipprintfs)
1.39      christos 1223:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1224: #endif
                   1225:        return (m);
                   1226: }
                   1227:
                   1228: /*
                   1229:  * Strip out IP options, at higher
                   1230:  * level protocol in the kernel.
                   1231:  * Second argument is buffer to which options
                   1232:  * will be moved, and return value is their length.
                   1233:  * XXX should be deleted; last arg currently ignored.
                   1234:  */
1.8       mycroft  1235: void
1.1       cgd      1236: ip_stripoptions(m, mopt)
                   1237:        register struct mbuf *m;
                   1238:        struct mbuf *mopt;
                   1239: {
                   1240:        register int i;
                   1241:        struct ip *ip = mtod(m, struct ip *);
                   1242:        register caddr_t opts;
                   1243:        int olen;
                   1244:
1.79      mycroft  1245:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1246:        opts = (caddr_t)(ip + 1);
                   1247:        i = m->m_len - (sizeof (struct ip) + olen);
                   1248:        bcopy(opts  + olen, opts, (unsigned)i);
                   1249:        m->m_len -= olen;
                   1250:        if (m->m_flags & M_PKTHDR)
                   1251:                m->m_pkthdr.len -= olen;
1.79      mycroft  1252:        ip->ip_len -= olen;
                   1253:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1254: }
                   1255:
1.23      mycroft  1256: int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1257:        0,              0,              0,              0,
                   1258:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1259:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1260:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1261:        0,              0,              0,              0,
                   1262:        ENOPROTOOPT
                   1263: };
                   1264:
                   1265: /*
                   1266:  * Forward a packet.  If some error occurs return the sender
                   1267:  * an icmp packet.  Note we can't always generate a meaningful
                   1268:  * icmp message because icmp doesn't have a large enough repertoire
                   1269:  * of codes and types.
                   1270:  *
                   1271:  * If not forwarding, just drop the packet.  This could be confusing
                   1272:  * if ipforwarding was zero but some routing protocol was advancing
                   1273:  * us as a gateway to somewhere.  However, we must let the routing
                   1274:  * protocol deal with that.
                   1275:  *
                   1276:  * The srcrt parameter indicates whether the packet is being forwarded
                   1277:  * via a source route.
                   1278:  */
1.13      mycroft  1279: void
1.1       cgd      1280: ip_forward(m, srcrt)
                   1281:        struct mbuf *m;
                   1282:        int srcrt;
                   1283: {
                   1284:        register struct ip *ip = mtod(m, struct ip *);
                   1285:        register struct sockaddr_in *sin;
                   1286:        register struct rtentry *rt;
1.28      christos 1287:        int error, type = 0, code = 0;
1.1       cgd      1288:        struct mbuf *mcopy;
1.13      mycroft  1289:        n_long dest;
                   1290:        struct ifnet *destifp;
1.82.2.2.2.2  thorpej  1291: #ifdef IPSEC
                   1292:        struct ifnet dummyifp;
                   1293: #endif
1.1       cgd      1294:
1.13      mycroft  1295:        dest = 0;
1.1       cgd      1296: #ifdef DIAGNOSTIC
                   1297:        if (ipprintfs)
1.70      thorpej  1298:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1299:                    ntohl(ip->ip_src.s_addr),
                   1300:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1301: #endif
                   1302:        if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
                   1303:                ipstat.ips_cantforward++;
                   1304:                m_freem(m);
                   1305:                return;
                   1306:        }
                   1307:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1308:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1309:                return;
                   1310:        }
                   1311:        ip->ip_ttl -= IPTTLDEC;
                   1312:
1.19      mycroft  1313:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1314:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1315:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1316:                if (ipforward_rt.ro_rt) {
                   1317:                        RTFREE(ipforward_rt.ro_rt);
                   1318:                        ipforward_rt.ro_rt = 0;
                   1319:                }
                   1320:                sin->sin_family = AF_INET;
1.35      mycroft  1321:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1322:                sin->sin_addr = ip->ip_dst;
                   1323:
                   1324:                rtalloc(&ipforward_rt);
                   1325:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1326:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1327:                        return;
                   1328:                }
                   1329:                rt = ipforward_rt.ro_rt;
                   1330:        }
                   1331:
                   1332:        /*
1.34      mycroft  1333:         * Save at most 68 bytes of the packet in case
1.1       cgd      1334:         * we need to generate an ICMP message to the src.
                   1335:         */
1.34      mycroft  1336:        mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1       cgd      1337:
                   1338:        /*
                   1339:         * If forwarding packet using same interface that it came in on,
                   1340:         * perhaps should send a redirect to sender to shortcut a hop.
                   1341:         * Only send redirect if source is sending directly to us,
                   1342:         * and if packet was not source routed (or has any options).
                   1343:         * Also, don't send redirect if forwarding using a default route
                   1344:         * or a route modified by a redirect.
                   1345:         */
                   1346:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1347:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1348:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1349:            ipsendredirects && !srcrt) {
1.19      mycroft  1350:                if (rt->rt_ifa &&
                   1351:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1352:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1353:                        if (rt->rt_flags & RTF_GATEWAY)
                   1354:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1355:                        else
                   1356:                                dest = ip->ip_dst.s_addr;
                   1357:                        /*
                   1358:                         * Router requirements says to only send host
                   1359:                         * redirects.
                   1360:                         */
                   1361:                        type = ICMP_REDIRECT;
                   1362:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1363: #ifdef DIAGNOSTIC
1.77      thorpej  1364:                        if (ipprintfs)
                   1365:                                printf("redirect (%d) to %x\n", code,
                   1366:                                    (u_int32_t)dest);
1.1       cgd      1367: #endif
                   1368:                }
                   1369:        }
                   1370:
1.82.2.2.2.2  thorpej  1371: #ifdef IPSEC
                   1372:        m->m_pkthdr.rcvif = NULL;
                   1373: #endif /*IPSEC*/
1.27      thorpej  1374:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1375:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1376:        if (error)
                   1377:                ipstat.ips_cantforward++;
                   1378:        else {
                   1379:                ipstat.ips_forward++;
                   1380:                if (type)
                   1381:                        ipstat.ips_redirectsent++;
                   1382:                else {
1.63      matt     1383:                        if (mcopy) {
                   1384: #ifdef GATEWAY
1.64      thorpej  1385:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1386:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1387: #endif
1.1       cgd      1388:                                m_freem(mcopy);
1.63      matt     1389:                        }
1.1       cgd      1390:                        return;
                   1391:                }
                   1392:        }
                   1393:        if (mcopy == NULL)
                   1394:                return;
1.13      mycroft  1395:        destifp = NULL;
                   1396:
1.1       cgd      1397:        switch (error) {
                   1398:
                   1399:        case 0:                         /* forwarded, but need redirect */
                   1400:                /* type, code set above */
                   1401:                break;
                   1402:
                   1403:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1404:        case EHOSTUNREACH:
                   1405:        case ENETDOWN:
                   1406:        case EHOSTDOWN:
                   1407:        default:
                   1408:                type = ICMP_UNREACH;
                   1409:                code = ICMP_UNREACH_HOST;
                   1410:                break;
                   1411:
                   1412:        case EMSGSIZE:
                   1413:                type = ICMP_UNREACH;
                   1414:                code = ICMP_UNREACH_NEEDFRAG;
1.82.2.2.2.2  thorpej  1415: #ifndef IPSEC
1.13      mycroft  1416:                if (ipforward_rt.ro_rt)
                   1417:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.82.2.2.2.2  thorpej  1418: #else
                   1419:                /*
                   1420:                 * If the packet is routed over IPsec tunnel, tell the
                   1421:                 * originator the tunnel MTU.
                   1422:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1423:                 * XXX quickhack!!!
                   1424:                 */
                   1425:                if (ipforward_rt.ro_rt) {
                   1426:                        struct secpolicy *sp;
                   1427:                        int ipsecerror;
                   1428:                        int ipsechdr;
                   1429:                        struct route *ro;
                   1430:
                   1431:                        sp = ipsec4_getpolicybyaddr(mcopy,
                   1432:                                                    IP_FORWARDING,
                   1433:                                                    &ipsecerror);
                   1434:
                   1435:                        if (sp == NULL)
                   1436:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1437:                        else {
                   1438:                                /* count IPsec header size */
                   1439:                                ipsechdr = ipsec4_hdrsiz(mcopy, NULL);
                   1440:
                   1441:                                /*
                   1442:                                 * find the correct route for outer IPv4
                   1443:                                 * header, compute tunnel MTU.
                   1444:                                 *
                   1445:                                 * XXX BUG ALERT
                   1446:                                 * The "dummyifp" code relies upon the fact
                   1447:                                 * that icmp_error() touches only ifp->if_mtu.
                   1448:                                 */
                   1449:                                /*XXX*/
                   1450:                                destifp = NULL;
                   1451:                                if (sp->req != NULL
                   1452:                                 && sp->req->sa != NULL) {
                   1453:                                        ro = &sp->req->sa->saidx->sa_route;
                   1454:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1455:                                                dummyifp.if_mtu =
                   1456:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1457:                                                dummyifp.if_mtu -= ipsechdr;
                   1458:                                                destifp = &dummyifp;
                   1459:                                        }
                   1460:                                }
                   1461:
                   1462:                                key_freesp(sp);
                   1463:                        }
                   1464:                }
                   1465: #endif /*IPSEC*/
1.1       cgd      1466:                ipstat.ips_cantfrag++;
                   1467:                break;
                   1468:
                   1469:        case ENOBUFS:
                   1470:                type = ICMP_SOURCEQUENCH;
                   1471:                code = 0;
                   1472:                break;
                   1473:        }
1.13      mycroft  1474:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1475: }
                   1476:
                   1477: void
                   1478: ip_savecontrol(inp, mp, ip, m)
                   1479:        register struct inpcb *inp;
                   1480:        register struct mbuf **mp;
                   1481:        register struct ip *ip;
                   1482:        register struct mbuf *m;
                   1483: {
                   1484:
                   1485:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1486:                struct timeval tv;
                   1487:
                   1488:                microtime(&tv);
                   1489:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1490:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1491:                if (*mp)
                   1492:                        mp = &(*mp)->m_next;
                   1493:        }
                   1494:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1495:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1496:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1497:                if (*mp)
                   1498:                        mp = &(*mp)->m_next;
                   1499:        }
                   1500: #ifdef notyet
                   1501:        /*
                   1502:         * XXX
                   1503:         * Moving these out of udp_input() made them even more broken
                   1504:         * than they already were.
                   1505:         *      - fenner@parc.xerox.com
                   1506:         */
                   1507:        /* options were tossed already */
                   1508:        if (inp->inp_flags & INP_RECVOPTS) {
                   1509:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1510:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1511:                if (*mp)
                   1512:                        mp = &(*mp)->m_next;
                   1513:        }
                   1514:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1515:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1516:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1517:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1518:                if (*mp)
                   1519:                        mp = &(*mp)->m_next;
                   1520:        }
                   1521: #endif
                   1522:        if (inp->inp_flags & INP_RECVIF) {
                   1523:                struct sockaddr_dl sdl;
                   1524:
                   1525:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1526:                sdl.sdl_family = AF_LINK;
                   1527:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1528:                    m->m_pkthdr.rcvif->if_index : 0;
                   1529:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1530:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1531:                    IP_RECVIF, IPPROTO_IP);
                   1532:                if (*mp)
                   1533:                        mp = &(*mp)->m_next;
                   1534:        }
1.13      mycroft  1535: }
                   1536:
                   1537: int
                   1538: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1539:        int *name;
                   1540:        u_int namelen;
                   1541:        void *oldp;
                   1542:        size_t *oldlenp;
                   1543:        void *newp;
                   1544:        size_t newlen;
                   1545: {
1.82.2.2.2.2  thorpej  1546:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1547:
1.54      lukem    1548:        int error, old;
                   1549:
1.13      mycroft  1550:        /* All sysctl names at this level are terminal. */
                   1551:        if (namelen != 1)
                   1552:                return (ENOTDIR);
                   1553:
                   1554:        switch (name[0]) {
                   1555:        case IPCTL_FORWARDING:
                   1556:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1557:        case IPCTL_SENDREDIRECTS:
                   1558:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1559:                        &ipsendredirects));
                   1560:        case IPCTL_DEFTTL:
                   1561:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1562: #ifdef notyet
                   1563:        case IPCTL_DEFMTU:
                   1564:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1565: #endif
1.26      thorpej  1566:        case IPCTL_FORWSRCRT:
1.47      cjs      1567:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1568:                if (securelevel > 0)
1.46      cjs      1569:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1570:                            ip_forwsrcrt));
                   1571:                else
                   1572:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1573:                            &ip_forwsrcrt));
1.27      thorpej  1574:        case IPCTL_DIRECTEDBCAST:
                   1575:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1576:                    &ip_directedbcast));
1.47      cjs      1577:        case IPCTL_ALLOWSRCRT:
                   1578:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1579:                    &ip_allowsrcrt));
1.52      thorpej  1580:        case IPCTL_SUBNETSARELOCAL:
                   1581:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1582:                    &subnetsarelocal));
1.53      kml      1583:        case IPCTL_MTUDISC:
1.60      kml      1584:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1585:                    &ip_mtudisc);
                   1586:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
                   1587:                        ip_mtudisc_timeout_q =
                   1588:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1589:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1590:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1591:                        ip_mtudisc_timeout_q = NULL;
                   1592:                }
                   1593:                return error;
1.54      lukem    1594:        case IPCTL_ANONPORTMIN:
                   1595:                old = anonportmin;
                   1596:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
                   1597:                if (anonportmin >= anonportmax || anonportmin > 65535
                   1598: #ifndef IPNOPRIVPORTS
                   1599:                    || anonportmin < IPPORT_RESERVED
                   1600: #endif
                   1601:                    ) {
                   1602:                        anonportmin = old;
                   1603:                        return (EINVAL);
                   1604:                }
                   1605:                return (error);
                   1606:        case IPCTL_ANONPORTMAX:
                   1607:                old = anonportmax;
                   1608:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
                   1609:                if (anonportmin >= anonportmax || anonportmax > 65535
                   1610: #ifndef IPNOPRIVPORTS
                   1611:                    || anonportmax < IPPORT_RESERVED
                   1612: #endif
                   1613:                    ) {
                   1614:                        anonportmax = old;
                   1615:                        return (EINVAL);
                   1616:                }
1.60      kml      1617:                return (error);
                   1618:        case IPCTL_MTUDISCTIMEOUT:
                   1619:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1620:                   &ip_mtudisc_timeout);
                   1621:                if (ip_mtudisc_timeout_q != NULL)
                   1622:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1623:                                              ip_mtudisc_timeout);
1.54      lukem    1624:                return (error);
1.65      matt     1625: #ifdef GATEWAY
                   1626:        case IPCTL_MAXFLOWS:
1.67      thorpej  1627:            {
                   1628:                int s;
                   1629:
1.65      matt     1630:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1631:                   &ip_maxflows);
1.67      thorpej  1632:                s = splsoftnet();
1.65      matt     1633:                ipflow_reap(0);
1.67      thorpej  1634:                splx(s);
1.65      matt     1635:                return (error);
1.67      thorpej  1636:            }
1.65      matt     1637: #endif
1.82.2.2.2.3! thorpej  1638:        case IPCTL_HOSTZEROBROADCAST:
        !          1639:                return (sysctl_int(oldp, oldlenp, newp, newlen,
        !          1640:                    &hostzeroisbroadcast));
1.82.2.2.2.2  thorpej  1641: #if NGIF > 0
                   1642:        case IPCTL_GIF_TTL:
                   1643:                return(sysctl_int(oldp, oldlenp, newp, newlen,
1.82.2.2.2.3! thorpej  1644:                                  &ip_gif_ttl));
1.82.2.2.2.2  thorpej  1645: #endif
                   1646:
1.13      mycroft  1647:        default:
                   1648:                return (EOPNOTSUPP);
                   1649:        }
                   1650:        /* NOTREACHED */
1.1       cgd      1651: }

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