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Annotation of src/sys/netinet/ip_input.c, Revision 1.115

1.115   ! mrg         1: /*     $NetBSD: ip_input.c,v 1.114 2000/05/10 03:31:30 itojun Exp $    */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
                     81:  * 3. All advertising materials mentioning features or use of this software
                     82:  *    must display the following acknowledgement:
                     83:  *     This product includes software developed by the University of
                     84:  *     California, Berkeley and its contributors.
                     85:  * 4. Neither the name of the University nor the names of its contributors
                     86:  *    may be used to endorse or promote products derived from this software
                     87:  *    without specific prior written permission.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     90:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     91:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     92:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     93:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     94:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     95:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     96:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     97:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     98:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     99:  * SUCH DAMAGE.
                    100:  *
1.14      cgd       101:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd       102:  */
1.55      scottr    103:
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91      thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.1       cgd       108:
1.5       mycroft   109: #include <sys/param.h>
                    110: #include <sys/systm.h>
                    111: #include <sys/malloc.h>
                    112: #include <sys/mbuf.h>
                    113: #include <sys/domain.h>
                    114: #include <sys/protosw.h>
                    115: #include <sys/socket.h>
1.44      thorpej   116: #include <sys/socketvar.h>
1.5       mycroft   117: #include <sys/errno.h>
                    118: #include <sys/time.h>
                    119: #include <sys/kernel.h>
1.28      christos  120: #include <sys/proc.h>
1.72      thorpej   121: #include <sys/pool.h>
1.28      christos  122:
1.115   ! mrg       123: #include <uvm/uvm_extern.h>
        !           124:
1.28      christos  125: #include <sys/sysctl.h>
1.1       cgd       126:
1.5       mycroft   127: #include <net/if.h>
1.44      thorpej   128: #include <net/if_dl.h>
1.5       mycroft   129: #include <net/route.h>
1.45      mrg       130: #include <net/pfil.h>
1.1       cgd       131:
1.5       mycroft   132: #include <netinet/in.h>
                    133: #include <netinet/in_systm.h>
                    134: #include <netinet/ip.h>
                    135: #include <netinet/in_pcb.h>
                    136: #include <netinet/in_var.h>
                    137: #include <netinet/ip_var.h>
                    138: #include <netinet/ip_icmp.h>
1.89      itojun    139: /* just for gif_ttl */
                    140: #include <netinet/in_gif.h>
                    141: #include "gif.h"
1.111     jdolecek  142:
                    143: #ifdef MROUTING
                    144: #include <netinet/ip_mroute.h>
                    145: #endif
1.89      itojun    146:
                    147: #ifdef IPSEC
                    148: #include <netinet6/ipsec.h>
                    149: #include <netkey/key.h>
                    150: #include <netkey/key_debug.h>
                    151: #endif
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    156: #else /* GATEWAY */
                    157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    158: #endif /* GATEWAY */
                    159: #endif /* IPFORWARDING */
                    160: #ifndef        IPSENDREDIRECTS
                    161: #define        IPSENDREDIRECTS 1
                    162: #endif
1.26      thorpej   163: #ifndef IPFORWSRCRT
1.47      cjs       164: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    165: #endif
                    166: #ifndef IPALLOWSRCRT
1.48      mrg       167: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   168: #endif
1.53      kml       169: #ifndef IPMTUDISC
                    170: #define IPMTUDISC      0
                    171: #endif
1.60      kml       172: #ifndef IPMTUDISCTIMEOUT
1.61      kml       173: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       174: #endif
1.53      kml       175:
1.27      thorpej   176: /*
                    177:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    178:  * configuration using this option will Just Work.
                    179:  */
                    180: #ifndef IPDIRECTEDBCAST
                    181: #ifdef DIRECTED_BROADCAST
                    182: #define IPDIRECTEDBCAST        1
                    183: #else
                    184: #define        IPDIRECTEDBCAST 0
                    185: #endif /* DIRECTED_BROADCAST */
                    186: #endif /* IPDIRECTEDBCAST */
1.1       cgd       187: int    ipforwarding = IPFORWARDING;
                    188: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   189: int    ip_defttl = IPDEFTTL;
1.26      thorpej   190: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   191: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       192: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       193: int    ip_mtudisc = IPMTUDISC;
1.60      kml       194: u_int  ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       195: #ifdef DIAGNOSTIC
                    196: int    ipprintfs = 0;
                    197: #endif
                    198:
1.60      kml       199: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    200:
1.1       cgd       201: extern struct domain inetdomain;
                    202: int    ipqmaxlen = IFQ_MAXLEN;
1.22      mycroft   203: struct in_ifaddrhead in_ifaddr;
1.57      tls       204: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13      mycroft   205: struct ifqueue ipintrq;
1.63      matt      206: struct ipstat  ipstat;
                    207: u_int16_t      ip_id;
1.75      thorpej   208:
1.63      matt      209: struct ipqhead ipq;
1.75      thorpej   210: int    ipq_locked;
                    211:
                    212: static __inline int ipq_lock_try __P((void));
                    213: static __inline void ipq_unlock __P((void));
                    214:
                    215: static __inline int
                    216: ipq_lock_try()
                    217: {
                    218:        int s;
                    219:
                    220:        s = splimp();
                    221:        if (ipq_locked) {
                    222:                splx(s);
                    223:                return (0);
                    224:        }
                    225:        ipq_locked = 1;
                    226:        splx(s);
                    227:        return (1);
                    228: }
                    229:
                    230: static __inline void
                    231: ipq_unlock()
                    232: {
                    233:        int s;
                    234:
                    235:        s = splimp();
                    236:        ipq_locked = 0;
                    237:        splx(s);
                    238: }
                    239:
                    240: #ifdef DIAGNOSTIC
                    241: #define        IPQ_LOCK()                                                      \
                    242: do {                                                                   \
                    243:        if (ipq_lock_try() == 0) {                                      \
                    244:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    245:                panic("ipq_lock");                                      \
                    246:        }                                                               \
                    247: } while (0)
                    248: #define        IPQ_LOCK_CHECK()                                                \
                    249: do {                                                                   \
                    250:        if (ipq_locked == 0) {                                          \
                    251:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    252:                panic("ipq lock check");                                \
                    253:        }                                                               \
                    254: } while (0)
                    255: #else
                    256: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    257: #define        IPQ_LOCK_CHECK()        /* nothing */
                    258: #endif
                    259:
                    260: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       261:
1.72      thorpej   262: struct pool ipqent_pool;
                    263:
1.1       cgd       264: /*
                    265:  * We need to save the IP options in case a protocol wants to respond
                    266:  * to an incoming packet over the same route if the packet got here
                    267:  * using IP source routing.  This allows connection establishment and
                    268:  * maintenance when the remote end is on a network that is not known
                    269:  * to us.
                    270:  */
                    271: int    ip_nhops = 0;
                    272: static struct ip_srcrt {
                    273:        struct  in_addr dst;                    /* final destination */
                    274:        char    nop;                            /* one NOP to align */
                    275:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    276:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    277: } ip_srcrt;
                    278:
1.13      mycroft   279: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   280:
1.1       cgd       281: /*
                    282:  * IP initialization: fill in IP protocol switch table.
                    283:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    284:  */
1.8       mycroft   285: void
1.1       cgd       286: ip_init()
                    287: {
1.109     augustss  288:        struct protosw *pr;
                    289:        int i;
1.1       cgd       290:
1.72      thorpej   291:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    292:            0, NULL, NULL, M_IPQ);
                    293:
1.1       cgd       294:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    295:        if (pr == 0)
                    296:                panic("ip_init");
                    297:        for (i = 0; i < IPPROTO_MAX; i++)
                    298:                ip_protox[i] = pr - inetsw;
                    299:        for (pr = inetdomain.dom_protosw;
                    300:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    301:                if (pr->pr_domain->dom_family == PF_INET &&
                    302:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    303:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       304:        LIST_INIT(&ipq);
1.1       cgd       305:        ip_id = time.tv_sec & 0xffff;
                    306:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   307:        TAILQ_INIT(&in_ifaddr);
1.57      tls       308:        in_ifaddrhashtbl =
                    309:            hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60      kml       310:        if (ip_mtudisc != 0)
                    311:                ip_mtudisc_timeout_q =
                    312:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   313: #ifdef GATEWAY
                    314:        ipflow_init();
                    315: #endif
1.1       cgd       316: }
                    317:
                    318: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    319: struct route ipforward_rt;
                    320:
                    321: /*
1.89      itojun    322:  * IP software interrupt routine
                    323:  */
                    324: void
                    325: ipintr()
                    326: {
                    327:        int s;
                    328:        struct mbuf *m;
                    329:
                    330:        while (1) {
                    331:                s = splimp();
                    332:                IF_DEQUEUE(&ipintrq, m);
                    333:                splx(s);
                    334:                if (m == 0)
                    335:                        return;
                    336:                ip_input(m);
                    337:        }
                    338: }
                    339:
                    340: /*
1.1       cgd       341:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    342:  * try to reassemble.  Process options.  Pass to next level.
                    343:  */
1.8       mycroft   344: void
1.89      itojun    345: ip_input(struct mbuf *m)
1.1       cgd       346: {
1.109     augustss  347:        struct ip *ip = NULL;
                    348:        struct ipq *fp;
                    349:        struct in_ifaddr *ia;
                    350:        struct ifaddr *ifa;
1.25      cgd       351:        struct ipqent *ipqe;
1.89      itojun    352:        int hlen = 0, mff, len;
1.100     itojun    353:        int downmatch;
1.36      mrg       354: #ifdef PFIL_HOOKS
1.33      mrg       355:        struct packet_filter_hook *pfh;
                    356:        struct mbuf *m0;
1.43      mrg       357:        int rv;
1.36      mrg       358: #endif /* PFIL_HOOKS */
1.1       cgd       359:
                    360: #ifdef DIAGNOSTIC
                    361:        if ((m->m_flags & M_PKTHDR) == 0)
                    362:                panic("ipintr no HDR");
                    363: #endif
1.89      itojun    364: #ifdef IPSEC
                    365:        /*
                    366:         * should the inner packet be considered authentic?
                    367:         * see comment in ah4_input().
                    368:         */
                    369:        if (m) {
                    370:                m->m_flags &= ~M_AUTHIPHDR;
                    371:                m->m_flags &= ~M_AUTHIPDGM;
                    372:        }
                    373: #endif
1.1       cgd       374:        /*
                    375:         * If no IP addresses have been set yet but the interfaces
                    376:         * are receiving, can't do anything with incoming packets yet.
                    377:         */
1.22      mycroft   378:        if (in_ifaddr.tqh_first == 0)
1.1       cgd       379:                goto bad;
                    380:        ipstat.ips_total++;
                    381:        if (m->m_len < sizeof (struct ip) &&
                    382:            (m = m_pullup(m, sizeof (struct ip))) == 0) {
                    383:                ipstat.ips_toosmall++;
1.89      itojun    384:                return;
1.1       cgd       385:        }
                    386:        ip = mtod(m, struct ip *);
1.13      mycroft   387:        if (ip->ip_v != IPVERSION) {
                    388:                ipstat.ips_badvers++;
                    389:                goto bad;
                    390:        }
1.1       cgd       391:        hlen = ip->ip_hl << 2;
                    392:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    393:                ipstat.ips_badhlen++;
                    394:                goto bad;
                    395:        }
                    396:        if (hlen > m->m_len) {
                    397:                if ((m = m_pullup(m, hlen)) == 0) {
                    398:                        ipstat.ips_badhlen++;
1.89      itojun    399:                        return;
1.1       cgd       400:                }
                    401:                ip = mtod(m, struct ip *);
                    402:        }
1.98      thorpej   403:
1.85      hwr       404:        /*
1.99      thorpej   405:         * RFC1122: packets with a multicast source address are
1.98      thorpej   406:         * not allowed.
1.85      hwr       407:         */
                    408:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98      thorpej   409:                /* XXX stat */
1.85      hwr       410:                goto bad;
                    411:        }
                    412:
1.78      mycroft   413:        if (in_cksum(m, hlen) != 0) {
1.1       cgd       414:                ipstat.ips_badsum++;
                    415:                goto bad;
                    416:        }
                    417:
                    418:        /*
                    419:         * Convert fields to host representation.
                    420:         */
                    421:        NTOHS(ip->ip_len);
                    422:        NTOHS(ip->ip_off);
1.35      mycroft   423:        len = ip->ip_len;
1.81      proff     424:
                    425:        /*
                    426:         * Check for additional length bogosity
                    427:         */
1.84      proff     428:        if (len < hlen) {
1.81      proff     429:                ipstat.ips_badlen++;
                    430:                goto bad;
                    431:        }
1.1       cgd       432:
                    433:        /*
                    434:         * Check that the amount of data in the buffers
                    435:         * is as at least much as the IP header would have us expect.
                    436:         * Trim mbufs if longer than we expect.
                    437:         * Drop packet if shorter than we expect.
                    438:         */
1.35      mycroft   439:        if (m->m_pkthdr.len < len) {
1.1       cgd       440:                ipstat.ips_tooshort++;
                    441:                goto bad;
                    442:        }
1.35      mycroft   443:        if (m->m_pkthdr.len > len) {
1.1       cgd       444:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   445:                        m->m_len = len;
                    446:                        m->m_pkthdr.len = len;
1.1       cgd       447:                } else
1.35      mycroft   448:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       449:        }
                    450:
1.94      itojun    451: #ifdef IPSEC
                    452:        /* ipflow (IP fast fowarding) is not compatible with IPsec. */
                    453:        m->m_flags &= ~M_CANFASTFWD;
                    454: #else
1.64      thorpej   455:        /*
                    456:         * Assume that we can create a fast-forward IP flow entry
                    457:         * based on this packet.
                    458:         */
                    459:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    460: #endif
1.64      thorpej   461:
1.36      mrg       462: #ifdef PFIL_HOOKS
1.33      mrg       463:        /*
1.64      thorpej   464:         * Run through list of hooks for input packets.  If there are any
                    465:         * filters which require that additional packets in the flow are
                    466:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    467:         * Note that filters must _never_ set this flag, as another filter
                    468:         * in the list may have previously cleared it.
1.33      mrg       469:         */
                    470:        m0 = m;
1.102     darrenr   471:        pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101     darrenr   472:        for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33      mrg       473:                if (pfh->pfil_func) {
1.101     darrenr   474:                        rv = pfh->pfil_func(ip, hlen,
                    475:                                            m->m_pkthdr.rcvif, 0, &m0);
1.43      mrg       476:                        if (rv)
1.89      itojun    477:                                return;
1.68      sommerfe  478:                        m = m0;
                    479:                        if (m == NULL)
1.89      itojun    480:                                return;
1.68      sommerfe  481:                        ip = mtod(m, struct ip *);
1.33      mrg       482:                }
1.36      mrg       483: #endif /* PFIL_HOOKS */
1.33      mrg       484:
1.1       cgd       485:        /*
                    486:         * Process options and, if not destined for us,
                    487:         * ship it on.  ip_dooptions returns 1 when an
                    488:         * error was detected (causing an icmp message
                    489:         * to be sent and the original packet to be freed).
                    490:         */
                    491:        ip_nhops = 0;           /* for source routed packets */
                    492:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    493:                return;
1.1       cgd       494:
                    495:        /*
                    496:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    497:         *
                    498:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    499:         * The behavior here is to treat addresses on !IFF_UP interface
                    500:         * as not mine.
1.1       cgd       501:         */
1.100     itojun    502:        downmatch = 0;
1.97      itojun    503:        for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
                    504:             ia != NULL;
                    505:             ia = ia->ia_hash.le_next) {
                    506:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    507:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    508:                                break;
1.100     itojun    509:                        else
                    510:                                downmatch++;
1.97      itojun    511:                }
                    512:        }
1.86      thorpej   513:        if (ia != NULL)
                    514:                goto ours;
1.57      tls       515:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
                    516:                for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    517:                    ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
                    518:                        if (ifa->ifa_addr->sa_family != AF_INET) continue;
                    519:                        ia = ifatoia(ifa);
1.35      mycroft   520:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    521:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   522:                            /*
                    523:                             * Look for all-0's host part (old broadcast addr),
                    524:                             * either for subnet or net.
                    525:                             */
                    526:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   527:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       528:                                goto ours;
1.57      tls       529:                        /*
                    530:                         * An interface with IP address zero accepts
                    531:                         * all packets that arrive on that interface.
                    532:                         */
                    533:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    534:                                goto ours;
1.1       cgd       535:                }
                    536:        }
1.18      mycroft   537:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   538:                struct in_multi *inm;
                    539: #ifdef MROUTING
                    540:                extern struct socket *ip_mrouter;
1.10      brezak    541:
                    542:                if (m->m_flags & M_EXT) {
                    543:                        if ((m = m_pullup(m, hlen)) == 0) {
                    544:                                ipstat.ips_toosmall++;
1.89      itojun    545:                                return;
1.10      brezak    546:                        }
                    547:                        ip = mtod(m, struct ip *);
                    548:                }
1.4       hpeyerl   549:
                    550:                if (ip_mrouter) {
                    551:                        /*
                    552:                         * If we are acting as a multicast router, all
                    553:                         * incoming multicast packets are passed to the
                    554:                         * kernel-level multicast forwarding function.
                    555:                         * The packet is returned (relatively) intact; if
                    556:                         * ip_mforward() returns a non-zero value, the packet
                    557:                         * must be discarded, else it may be accepted below.
                    558:                         *
                    559:                         * (The IP ident field is put in the same byte order
                    560:                         * as expected when ip_mforward() is called from
                    561:                         * ip_output().)
                    562:                         */
1.13      mycroft   563:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    564:                                ipstat.ips_cantforward++;
1.4       hpeyerl   565:                                m_freem(m);
1.89      itojun    566:                                return;
1.4       hpeyerl   567:                        }
                    568:
                    569:                        /*
                    570:                         * The process-level routing demon needs to receive
                    571:                         * all multicast IGMP packets, whether or not this
                    572:                         * host belongs to their destination groups.
                    573:                         */
                    574:                        if (ip->ip_p == IPPROTO_IGMP)
                    575:                                goto ours;
1.13      mycroft   576:                        ipstat.ips_forward++;
1.4       hpeyerl   577:                }
                    578: #endif
                    579:                /*
                    580:                 * See if we belong to the destination multicast group on the
                    581:                 * arrival interface.
                    582:                 */
                    583:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    584:                if (inm == NULL) {
1.13      mycroft   585:                        ipstat.ips_cantforward++;
1.4       hpeyerl   586:                        m_freem(m);
1.89      itojun    587:                        return;
1.4       hpeyerl   588:                }
                    589:                goto ours;
                    590:        }
1.19      mycroft   591:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   592:            in_nullhost(ip->ip_dst))
1.1       cgd       593:                goto ours;
                    594:
                    595:        /*
                    596:         * Not for us; forward if possible and desirable.
                    597:         */
                    598:        if (ipforwarding == 0) {
                    599:                ipstat.ips_cantforward++;
                    600:                m_freem(m);
1.100     itojun    601:        } else {
                    602:                /*
                    603:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    604:                 * and there's no IFF_UP interface that matches ip_dst,
                    605:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    606:                 * forwarding loop till TTL goes to 0.
                    607:                 */
                    608:                if (downmatch) {
                    609:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    610:                        ipstat.ips_cantforward++;
                    611:                        return;
                    612:                }
1.1       cgd       613:                ip_forward(m, 0);
1.100     itojun    614:        }
1.89      itojun    615:        return;
1.1       cgd       616:
                    617: ours:
                    618:        /*
                    619:         * If offset or IP_MF are set, must reassemble.
                    620:         * Otherwise, nothing need be done.
                    621:         * (We could look in the reassembly queue to see
                    622:         * if the packet was previously fragmented,
                    623:         * but it's not worth the time; just let them time out.)
                    624:         */
1.37      perry     625:        if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1       cgd       626:                /*
                    627:                 * Look for queue of fragments
                    628:                 * of this datagram.
                    629:                 */
1.75      thorpej   630:                IPQ_LOCK();
1.25      cgd       631:                for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1       cgd       632:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   633:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    634:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       635:                            ip->ip_p == fp->ipq_p)
                    636:                                goto found;
                    637:                fp = 0;
                    638: found:
                    639:
                    640:                /*
                    641:                 * Adjust ip_len to not reflect header,
1.25      cgd       642:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       643:                 * convert offset of this to bytes.
                    644:                 */
                    645:                ip->ip_len -= hlen;
1.25      cgd       646:                mff = (ip->ip_off & IP_MF) != 0;
                    647:                if (mff) {
1.16      cgd       648:                        /*
                    649:                         * Make sure that fragments have a data length
                    650:                         * that's a non-zero multiple of 8 bytes.
                    651:                         */
1.17      cgd       652:                        if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16      cgd       653:                                ipstat.ips_badfrags++;
1.75      thorpej   654:                                IPQ_UNLOCK();
1.16      cgd       655:                                goto bad;
                    656:                        }
                    657:                }
1.1       cgd       658:                ip->ip_off <<= 3;
                    659:
                    660:                /*
                    661:                 * If datagram marked as having more fragments
                    662:                 * or if this is not the first fragment,
                    663:                 * attempt reassembly; if it succeeds, proceed.
                    664:                 */
1.25      cgd       665:                if (mff || ip->ip_off) {
1.1       cgd       666:                        ipstat.ips_fragments++;
1.72      thorpej   667:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       668:                        if (ipqe == NULL) {
                    669:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   670:                                IPQ_UNLOCK();
1.25      cgd       671:                                goto bad;
                    672:                        }
                    673:                        ipqe->ipqe_mff = mff;
1.50      thorpej   674:                        ipqe->ipqe_m = m;
1.25      cgd       675:                        ipqe->ipqe_ip = ip;
1.50      thorpej   676:                        m = ip_reass(ipqe, fp);
1.75      thorpej   677:                        if (m == 0) {
                    678:                                IPQ_UNLOCK();
1.89      itojun    679:                                return;
1.75      thorpej   680:                        }
1.13      mycroft   681:                        ipstat.ips_reassembled++;
1.50      thorpej   682:                        ip = mtod(m, struct ip *);
1.74      thorpej   683:                        hlen = ip->ip_hl << 2;
1.79      mycroft   684:                        ip->ip_len += hlen;
1.1       cgd       685:                } else
                    686:                        if (fp)
                    687:                                ip_freef(fp);
1.75      thorpej   688:                IPQ_UNLOCK();
1.79      mycroft   689:        }
1.1       cgd       690:
                    691:        /*
                    692:         * Switch out to protocol's input routine.
                    693:         */
1.82      aidan     694: #if IFA_STATS
                    695:        ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
                    696: #endif
1.1       cgd       697:        ipstat.ips_delivered++;
1.89      itojun    698:     {
                    699:        int off = hlen, nh = ip->ip_p;
                    700:
                    701:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    702:        return;
                    703:     }
1.1       cgd       704: bad:
                    705:        m_freem(m);
                    706: }
                    707:
                    708: /*
                    709:  * Take incoming datagram fragment and try to
                    710:  * reassemble it into whole datagram.  If a chain for
                    711:  * reassembly of this datagram already exists, then it
                    712:  * is given as fp; otherwise have to make a chain.
                    713:  */
1.50      thorpej   714: struct mbuf *
1.25      cgd       715: ip_reass(ipqe, fp)
1.109     augustss  716:        struct ipqent *ipqe;
                    717:        struct ipq *fp;
1.1       cgd       718: {
1.109     augustss  719:        struct mbuf *m = ipqe->ipqe_m;
                    720:        struct ipqent *nq, *p, *q;
1.25      cgd       721:        struct ip *ip;
1.1       cgd       722:        struct mbuf *t;
1.25      cgd       723:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       724:        int i, next;
                    725:
1.75      thorpej   726:        IPQ_LOCK_CHECK();
                    727:
1.1       cgd       728:        /*
                    729:         * Presence of header sizes in mbufs
                    730:         * would confuse code below.
                    731:         */
                    732:        m->m_data += hlen;
                    733:        m->m_len -= hlen;
                    734:
                    735:        /*
                    736:         * If first fragment to arrive, create a reassembly queue.
                    737:         */
                    738:        if (fp == 0) {
1.50      thorpej   739:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    740:                    M_FTABLE, M_NOWAIT);
                    741:                if (fp == NULL)
1.1       cgd       742:                        goto dropfrag;
1.25      cgd       743:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       744:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       745:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    746:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
                    747:                LIST_INIT(&fp->ipq_fragq);
                    748:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    749:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    750:                p = NULL;
1.1       cgd       751:                goto insert;
                    752:        }
                    753:
                    754:        /*
                    755:         * Find a segment which begins after this one does.
                    756:         */
1.25      cgd       757:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    758:            p = q, q = q->ipqe_q.le_next)
                    759:                if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1       cgd       760:                        break;
                    761:
                    762:        /*
                    763:         * If there is a preceding segment, it may provide some of
                    764:         * our data already.  If so, drop the data from the incoming
                    765:         * segment.  If it provides all of our data, drop us.
                    766:         */
1.25      cgd       767:        if (p != NULL) {
                    768:                i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
                    769:                    ipqe->ipqe_ip->ip_off;
1.1       cgd       770:                if (i > 0) {
1.25      cgd       771:                        if (i >= ipqe->ipqe_ip->ip_len)
1.1       cgd       772:                                goto dropfrag;
1.50      thorpej   773:                        m_adj(ipqe->ipqe_m, i);
1.25      cgd       774:                        ipqe->ipqe_ip->ip_off += i;
                    775:                        ipqe->ipqe_ip->ip_len -= i;
1.1       cgd       776:                }
                    777:        }
                    778:
                    779:        /*
                    780:         * While we overlap succeeding segments trim them or,
                    781:         * if they are completely covered, dequeue them.
                    782:         */
1.25      cgd       783:        for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
                    784:            q->ipqe_ip->ip_off; q = nq) {
                    785:                i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
                    786:                    q->ipqe_ip->ip_off;
                    787:                if (i < q->ipqe_ip->ip_len) {
                    788:                        q->ipqe_ip->ip_len -= i;
                    789:                        q->ipqe_ip->ip_off += i;
1.50      thorpej   790:                        m_adj(q->ipqe_m, i);
1.1       cgd       791:                        break;
                    792:                }
1.25      cgd       793:                nq = q->ipqe_q.le_next;
1.50      thorpej   794:                m_freem(q->ipqe_m);
1.25      cgd       795:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   796:                pool_put(&ipqent_pool, q);
1.1       cgd       797:        }
                    798:
                    799: insert:
                    800:        /*
                    801:         * Stick new segment in its place;
                    802:         * check for complete reassembly.
                    803:         */
1.25      cgd       804:        if (p == NULL) {
                    805:                LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
                    806:        } else {
                    807:                LIST_INSERT_AFTER(p, ipqe, ipqe_q);
                    808:        }
1.1       cgd       809:        next = 0;
1.25      cgd       810:        for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
                    811:            p = q, q = q->ipqe_q.le_next) {
                    812:                if (q->ipqe_ip->ip_off != next)
1.1       cgd       813:                        return (0);
1.25      cgd       814:                next += q->ipqe_ip->ip_len;
1.1       cgd       815:        }
1.25      cgd       816:        if (p->ipqe_mff)
1.1       cgd       817:                return (0);
                    818:
                    819:        /*
1.41      thorpej   820:         * Reassembly is complete.  Check for a bogus message size and
                    821:         * concatenate fragments.
1.1       cgd       822:         */
1.25      cgd       823:        q = fp->ipq_fragq.lh_first;
                    824:        ip = q->ipqe_ip;
1.41      thorpej   825:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    826:                ipstat.ips_toolong++;
                    827:                ip_freef(fp);
                    828:                return (0);
                    829:        }
1.50      thorpej   830:        m = q->ipqe_m;
1.1       cgd       831:        t = m->m_next;
                    832:        m->m_next = 0;
                    833:        m_cat(m, t);
1.25      cgd       834:        nq = q->ipqe_q.le_next;
1.72      thorpej   835:        pool_put(&ipqent_pool, q);
1.25      cgd       836:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   837:                t = q->ipqe_m;
1.25      cgd       838:                nq = q->ipqe_q.le_next;
1.72      thorpej   839:                pool_put(&ipqent_pool, q);
1.1       cgd       840:                m_cat(m, t);
                    841:        }
                    842:
                    843:        /*
                    844:         * Create header for new ip packet by
                    845:         * modifying header of first packet;
                    846:         * dequeue and discard fragment reassembly header.
                    847:         * Make header visible.
                    848:         */
                    849:        ip->ip_len = next;
1.25      cgd       850:        ip->ip_src = fp->ipq_src;
                    851:        ip->ip_dst = fp->ipq_dst;
                    852:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   853:        FREE(fp, M_FTABLE);
1.1       cgd       854:        m->m_len += (ip->ip_hl << 2);
                    855:        m->m_data -= (ip->ip_hl << 2);
                    856:        /* some debugging cruft by sklower, below, will go away soon */
                    857:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss  858:                int plen = 0;
1.50      thorpej   859:                for (t = m; t; t = t->m_next)
                    860:                        plen += t->m_len;
                    861:                m->m_pkthdr.len = plen;
1.1       cgd       862:        }
1.50      thorpej   863:        return (m);
1.1       cgd       864:
                    865: dropfrag:
                    866:        ipstat.ips_fragdropped++;
                    867:        m_freem(m);
1.72      thorpej   868:        pool_put(&ipqent_pool, ipqe);
1.1       cgd       869:        return (0);
                    870: }
                    871:
                    872: /*
                    873:  * Free a fragment reassembly header and all
                    874:  * associated datagrams.
                    875:  */
1.8       mycroft   876: void
1.1       cgd       877: ip_freef(fp)
                    878:        struct ipq *fp;
                    879: {
1.109     augustss  880:        struct ipqent *q, *p;
1.1       cgd       881:
1.75      thorpej   882:        IPQ_LOCK_CHECK();
                    883:
1.25      cgd       884:        for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
                    885:                p = q->ipqe_q.le_next;
1.50      thorpej   886:                m_freem(q->ipqe_m);
1.25      cgd       887:                LIST_REMOVE(q, ipqe_q);
1.72      thorpej   888:                pool_put(&ipqent_pool, q);
1.1       cgd       889:        }
1.25      cgd       890:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   891:        FREE(fp, M_FTABLE);
1.1       cgd       892: }
                    893:
                    894: /*
                    895:  * IP timer processing;
                    896:  * if a timer expires on a reassembly
                    897:  * queue, discard it.
                    898:  */
1.8       mycroft   899: void
1.1       cgd       900: ip_slowtimo()
                    901: {
1.109     augustss  902:        struct ipq *fp, *nfp;
1.24      mycroft   903:        int s = splsoftnet();
1.1       cgd       904:
1.75      thorpej   905:        IPQ_LOCK();
1.25      cgd       906:        for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
                    907:                nfp = fp->ipq_q.le_next;
                    908:                if (--fp->ipq_ttl == 0) {
1.1       cgd       909:                        ipstat.ips_fragtimeout++;
1.25      cgd       910:                        ip_freef(fp);
1.1       cgd       911:                }
                    912:        }
1.75      thorpej   913:        IPQ_UNLOCK();
1.63      matt      914: #ifdef GATEWAY
                    915:        ipflow_slowtimo();
                    916: #endif
1.1       cgd       917:        splx(s);
                    918: }
                    919:
                    920: /*
                    921:  * Drain off all datagram fragments.
                    922:  */
1.8       mycroft   923: void
1.1       cgd       924: ip_drain()
                    925: {
                    926:
1.75      thorpej   927:        /*
                    928:         * We may be called from a device's interrupt context.  If
                    929:         * the ipq is already busy, just bail out now.
                    930:         */
                    931:        if (ipq_lock_try() == 0)
                    932:                return;
                    933:
1.25      cgd       934:        while (ipq.lh_first != NULL) {
1.1       cgd       935:                ipstat.ips_fragdropped++;
1.25      cgd       936:                ip_freef(ipq.lh_first);
1.1       cgd       937:        }
1.75      thorpej   938:
                    939:        IPQ_UNLOCK();
1.1       cgd       940: }
                    941:
                    942: /*
                    943:  * Do option processing on a datagram,
                    944:  * possibly discarding it if bad options are encountered,
                    945:  * or forwarding it if source-routed.
                    946:  * Returns 1 if packet has been forwarded/freed,
                    947:  * 0 if the packet should be processed further.
                    948:  */
1.8       mycroft   949: int
1.1       cgd       950: ip_dooptions(m)
                    951:        struct mbuf *m;
                    952: {
1.109     augustss  953:        struct ip *ip = mtod(m, struct ip *);
                    954:        u_char *cp, *cp0;
                    955:        struct ip_timestamp *ipt;
                    956:        struct in_ifaddr *ia;
1.1       cgd       957:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   958:        struct in_addr dst;
1.1       cgd       959:        n_time ntime;
                    960:
1.13      mycroft   961:        dst = ip->ip_dst;
1.1       cgd       962:        cp = (u_char *)(ip + 1);
                    963:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    964:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    965:                opt = cp[IPOPT_OPTVAL];
                    966:                if (opt == IPOPT_EOL)
                    967:                        break;
                    968:                if (opt == IPOPT_NOP)
                    969:                        optlen = 1;
                    970:                else {
1.113     itojun    971:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    972:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    973:                                goto bad;
                    974:                        }
1.1       cgd       975:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    976:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       977:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    978:                                goto bad;
                    979:                        }
                    980:                }
                    981:                switch (opt) {
                    982:
                    983:                default:
                    984:                        break;
                    985:
                    986:                /*
                    987:                 * Source routing with record.
                    988:                 * Find interface with current destination address.
                    989:                 * If none on this machine then drop if strictly routed,
                    990:                 * or do nothing if loosely routed.
                    991:                 * Record interface address and bring up next address
                    992:                 * component.  If strictly routed make sure next
                    993:                 * address is on directly accessible net.
                    994:                 */
                    995:                case IPOPT_LSRR:
                    996:                case IPOPT_SSRR:
1.47      cjs       997:                        if (ip_allowsrcrt == 0) {
                    998:                                type = ICMP_UNREACH;
                    999:                                code = ICMP_UNREACH_NET_PROHIB;
                   1000:                                goto bad;
                   1001:                        }
1.114     itojun   1002:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1003:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1004:                                goto bad;
                   1005:                        }
1.1       cgd      1006:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1007:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1008:                                goto bad;
                   1009:                        }
                   1010:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1011:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1012:                        if (ia == 0) {
                   1013:                                if (opt == IPOPT_SSRR) {
                   1014:                                        type = ICMP_UNREACH;
                   1015:                                        code = ICMP_UNREACH_SRCFAIL;
                   1016:                                        goto bad;
                   1017:                                }
                   1018:                                /*
                   1019:                                 * Loose routing, and not at next destination
                   1020:                                 * yet; nothing to do except forward.
                   1021:                                 */
                   1022:                                break;
                   1023:                        }
                   1024:                        off--;                  /* 0 origin */
1.112     sommerfe 1025:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1026:                                /*
                   1027:                                 * End of source route.  Should be for us.
                   1028:                                 */
                   1029:                                save_rte(cp, ip->ip_src);
                   1030:                                break;
                   1031:                        }
                   1032:                        /*
                   1033:                         * locate outgoing interface
                   1034:                         */
                   1035:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1036:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1037:                        if (opt == IPOPT_SSRR)
                   1038:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1039:                        else
1.1       cgd      1040:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1041:                        if (ia == 0) {
                   1042:                                type = ICMP_UNREACH;
                   1043:                                code = ICMP_UNREACH_SRCFAIL;
                   1044:                                goto bad;
                   1045:                        }
                   1046:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1047:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1048:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1049:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1050:                        /*
                   1051:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1052:                         */
1.18      mycroft  1053:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1054:                        break;
                   1055:
                   1056:                case IPOPT_RR:
1.114     itojun   1057:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1058:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1059:                                goto bad;
                   1060:                        }
1.1       cgd      1061:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1062:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1063:                                goto bad;
                   1064:                        }
                   1065:                        /*
                   1066:                         * If no space remains, ignore.
                   1067:                         */
                   1068:                        off--;                  /* 0 origin */
1.112     sommerfe 1069:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1070:                                break;
                   1071:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1072:                            sizeof(ipaddr.sin_addr));
                   1073:                        /*
                   1074:                         * locate outgoing interface; if we're the destination,
                   1075:                         * use the incoming interface (should be same).
                   1076:                         */
1.96      thorpej  1077:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1078:                            == NULL &&
                   1079:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1080:                                type = ICMP_UNREACH;
                   1081:                                code = ICMP_UNREACH_HOST;
                   1082:                                goto bad;
                   1083:                        }
1.20      mycroft  1084:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1085:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1086:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1087:                        break;
                   1088:
                   1089:                case IPOPT_TS:
                   1090:                        code = cp - (u_char *)ip;
                   1091:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1092:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1093:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1094:                                goto bad;
1.114     itojun   1095:                        }
                   1096:                        if (ipt->ipt_ptr < 5) {
                   1097:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1098:                                goto bad;
                   1099:                        }
1.15      cgd      1100:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1101:                                if (++ipt->ipt_oflw == 0) {
                   1102:                                        code = (u_char *)&ipt->ipt_ptr -
                   1103:                                            (u_char *)ip;
1.1       cgd      1104:                                        goto bad;
1.114     itojun   1105:                                }
1.1       cgd      1106:                                break;
                   1107:                        }
1.104     thorpej  1108:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1109:                        switch (ipt->ipt_flg) {
                   1110:
                   1111:                        case IPOPT_TS_TSONLY:
                   1112:                                break;
                   1113:
                   1114:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1115:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1116:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1117:                                        code = (u_char *)&ipt->ipt_ptr -
                   1118:                                            (u_char *)ip;
1.1       cgd      1119:                                        goto bad;
1.114     itojun   1120:                                }
1.13      mycroft  1121:                                ipaddr.sin_addr = dst;
1.96      thorpej  1122:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1123:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1124:                                if (ia == 0)
                   1125:                                        continue;
1.104     thorpej  1126:                                bcopy(&ia->ia_addr.sin_addr,
                   1127:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1128:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1129:                                break;
                   1130:
                   1131:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1132:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1133:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1134:                                        code = (u_char *)&ipt->ipt_ptr -
                   1135:                                            (u_char *)ip;
1.1       cgd      1136:                                        goto bad;
1.114     itojun   1137:                                }
1.104     thorpej  1138:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1139:                                    sizeof(struct in_addr));
1.96      thorpej  1140:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1141:                                    == NULL)
1.1       cgd      1142:                                        continue;
                   1143:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1144:                                break;
                   1145:
                   1146:                        default:
1.114     itojun   1147:                                /* XXX can't take &ipt->ipt_flg */
                   1148:                                code = (u_char *)&ipt->ipt_ptr -
                   1149:                                    (u_char *)ip + 1;
1.1       cgd      1150:                                goto bad;
                   1151:                        }
                   1152:                        ntime = iptime();
1.107     thorpej  1153:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1154:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1155:                            sizeof(n_time));
                   1156:                        ipt->ipt_ptr += sizeof(n_time);
                   1157:                }
                   1158:        }
                   1159:        if (forward) {
1.26      thorpej  1160:                if (ip_forwsrcrt == 0) {
                   1161:                        type = ICMP_UNREACH;
                   1162:                        code = ICMP_UNREACH_SRCFAIL;
                   1163:                        goto bad;
                   1164:                }
1.1       cgd      1165:                ip_forward(m, 1);
                   1166:                return (1);
1.13      mycroft  1167:        }
                   1168:        return (0);
1.1       cgd      1169: bad:
1.13      mycroft  1170:        icmp_error(m, type, code, 0, 0);
                   1171:        ipstat.ips_badoptions++;
1.1       cgd      1172:        return (1);
                   1173: }
                   1174:
                   1175: /*
                   1176:  * Given address of next destination (final or next hop),
                   1177:  * return internet address info of interface to be used to get there.
                   1178:  */
                   1179: struct in_ifaddr *
                   1180: ip_rtaddr(dst)
                   1181:         struct in_addr dst;
                   1182: {
1.109     augustss 1183:        struct sockaddr_in *sin;
1.1       cgd      1184:
1.19      mycroft  1185:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1186:
1.35      mycroft  1187:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1188:                if (ipforward_rt.ro_rt) {
                   1189:                        RTFREE(ipforward_rt.ro_rt);
                   1190:                        ipforward_rt.ro_rt = 0;
                   1191:                }
                   1192:                sin->sin_family = AF_INET;
                   1193:                sin->sin_len = sizeof(*sin);
                   1194:                sin->sin_addr = dst;
                   1195:
                   1196:                rtalloc(&ipforward_rt);
                   1197:        }
                   1198:        if (ipforward_rt.ro_rt == 0)
                   1199:                return ((struct in_ifaddr *)0);
1.19      mycroft  1200:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1201: }
                   1202:
                   1203: /*
                   1204:  * Save incoming source route for use in replies,
                   1205:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1206:  */
1.13      mycroft  1207: void
1.1       cgd      1208: save_rte(option, dst)
                   1209:        u_char *option;
                   1210:        struct in_addr dst;
                   1211: {
                   1212:        unsigned olen;
                   1213:
                   1214:        olen = option[IPOPT_OLEN];
                   1215: #ifdef DIAGNOSTIC
                   1216:        if (ipprintfs)
1.39      christos 1217:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1218: #endif /* 0 */
1.1       cgd      1219:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1220:                return;
                   1221:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1222:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1223:        ip_srcrt.dst = dst;
                   1224: }
                   1225:
                   1226: /*
                   1227:  * Retrieve incoming source route for use in replies,
                   1228:  * in the same form used by setsockopt.
                   1229:  * The first hop is placed before the options, will be removed later.
                   1230:  */
                   1231: struct mbuf *
                   1232: ip_srcroute()
                   1233: {
1.109     augustss 1234:        struct in_addr *p, *q;
                   1235:        struct mbuf *m;
1.1       cgd      1236:
                   1237:        if (ip_nhops == 0)
                   1238:                return ((struct mbuf *)0);
                   1239:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1240:        if (m == 0)
                   1241:                return ((struct mbuf *)0);
                   1242:
1.13      mycroft  1243: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1244:
                   1245:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1246:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1247:            OPTSIZ;
                   1248: #ifdef DIAGNOSTIC
                   1249:        if (ipprintfs)
1.39      christos 1250:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1251: #endif
                   1252:
                   1253:        /*
                   1254:         * First save first hop for return route
                   1255:         */
                   1256:        p = &ip_srcrt.route[ip_nhops - 1];
                   1257:        *(mtod(m, struct in_addr *)) = *p--;
                   1258: #ifdef DIAGNOSTIC
                   1259:        if (ipprintfs)
1.39      christos 1260:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1261: #endif
                   1262:
                   1263:        /*
                   1264:         * Copy option fields and padding (nop) to mbuf.
                   1265:         */
                   1266:        ip_srcrt.nop = IPOPT_NOP;
                   1267:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1268:        bcopy((caddr_t)&ip_srcrt.nop,
                   1269:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1270:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1271:            sizeof(struct in_addr) + OPTSIZ);
                   1272: #undef OPTSIZ
                   1273:        /*
                   1274:         * Record return path as an IP source route,
                   1275:         * reversing the path (pointers are now aligned).
                   1276:         */
                   1277:        while (p >= ip_srcrt.route) {
                   1278: #ifdef DIAGNOSTIC
                   1279:                if (ipprintfs)
1.39      christos 1280:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1281: #endif
                   1282:                *q++ = *p--;
                   1283:        }
                   1284:        /*
                   1285:         * Last hop goes to final destination.
                   1286:         */
                   1287:        *q = ip_srcrt.dst;
                   1288: #ifdef DIAGNOSTIC
                   1289:        if (ipprintfs)
1.39      christos 1290:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1291: #endif
                   1292:        return (m);
                   1293: }
                   1294:
                   1295: /*
                   1296:  * Strip out IP options, at higher
                   1297:  * level protocol in the kernel.
                   1298:  * Second argument is buffer to which options
                   1299:  * will be moved, and return value is their length.
                   1300:  * XXX should be deleted; last arg currently ignored.
                   1301:  */
1.8       mycroft  1302: void
1.1       cgd      1303: ip_stripoptions(m, mopt)
1.109     augustss 1304:        struct mbuf *m;
1.1       cgd      1305:        struct mbuf *mopt;
                   1306: {
1.109     augustss 1307:        int i;
1.1       cgd      1308:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1309:        caddr_t opts;
1.1       cgd      1310:        int olen;
                   1311:
1.79      mycroft  1312:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1313:        opts = (caddr_t)(ip + 1);
                   1314:        i = m->m_len - (sizeof (struct ip) + olen);
                   1315:        bcopy(opts  + olen, opts, (unsigned)i);
                   1316:        m->m_len -= olen;
                   1317:        if (m->m_flags & M_PKTHDR)
                   1318:                m->m_pkthdr.len -= olen;
1.79      mycroft  1319:        ip->ip_len -= olen;
                   1320:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1321: }
                   1322:
1.23      mycroft  1323: int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1324:        0,              0,              0,              0,
                   1325:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1326:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1327:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1328:        0,              0,              0,              0,
                   1329:        ENOPROTOOPT
                   1330: };
                   1331:
                   1332: /*
                   1333:  * Forward a packet.  If some error occurs return the sender
                   1334:  * an icmp packet.  Note we can't always generate a meaningful
                   1335:  * icmp message because icmp doesn't have a large enough repertoire
                   1336:  * of codes and types.
                   1337:  *
                   1338:  * If not forwarding, just drop the packet.  This could be confusing
                   1339:  * if ipforwarding was zero but some routing protocol was advancing
                   1340:  * us as a gateway to somewhere.  However, we must let the routing
                   1341:  * protocol deal with that.
                   1342:  *
                   1343:  * The srcrt parameter indicates whether the packet is being forwarded
                   1344:  * via a source route.
                   1345:  */
1.13      mycroft  1346: void
1.1       cgd      1347: ip_forward(m, srcrt)
                   1348:        struct mbuf *m;
                   1349:        int srcrt;
                   1350: {
1.109     augustss 1351:        struct ip *ip = mtod(m, struct ip *);
                   1352:        struct sockaddr_in *sin;
                   1353:        struct rtentry *rt;
1.28      christos 1354:        int error, type = 0, code = 0;
1.1       cgd      1355:        struct mbuf *mcopy;
1.13      mycroft  1356:        n_long dest;
                   1357:        struct ifnet *destifp;
1.89      itojun   1358: #ifdef IPSEC
                   1359:        struct ifnet dummyifp;
                   1360: #endif
1.1       cgd      1361:
1.13      mycroft  1362:        dest = 0;
1.1       cgd      1363: #ifdef DIAGNOSTIC
                   1364:        if (ipprintfs)
1.70      thorpej  1365:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1366:                    ntohl(ip->ip_src.s_addr),
                   1367:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1368: #endif
1.93      sommerfe 1369:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1370:                ipstat.ips_cantforward++;
                   1371:                m_freem(m);
                   1372:                return;
                   1373:        }
                   1374:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1375:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1376:                return;
                   1377:        }
                   1378:        ip->ip_ttl -= IPTTLDEC;
                   1379:
1.19      mycroft  1380:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1381:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1382:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1383:                if (ipforward_rt.ro_rt) {
                   1384:                        RTFREE(ipforward_rt.ro_rt);
                   1385:                        ipforward_rt.ro_rt = 0;
                   1386:                }
                   1387:                sin->sin_family = AF_INET;
1.35      mycroft  1388:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1389:                sin->sin_addr = ip->ip_dst;
                   1390:
                   1391:                rtalloc(&ipforward_rt);
                   1392:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1393:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1394:                        return;
                   1395:                }
                   1396:                rt = ipforward_rt.ro_rt;
                   1397:        }
                   1398:
                   1399:        /*
1.34      mycroft  1400:         * Save at most 68 bytes of the packet in case
1.1       cgd      1401:         * we need to generate an ICMP message to the src.
                   1402:         */
1.34      mycroft  1403:        mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1       cgd      1404:
                   1405:        /*
                   1406:         * If forwarding packet using same interface that it came in on,
                   1407:         * perhaps should send a redirect to sender to shortcut a hop.
                   1408:         * Only send redirect if source is sending directly to us,
                   1409:         * and if packet was not source routed (or has any options).
                   1410:         * Also, don't send redirect if forwarding using a default route
                   1411:         * or a route modified by a redirect.
                   1412:         */
                   1413:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1414:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1415:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1416:            ipsendredirects && !srcrt) {
1.19      mycroft  1417:                if (rt->rt_ifa &&
                   1418:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1419:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1420:                        if (rt->rt_flags & RTF_GATEWAY)
                   1421:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1422:                        else
                   1423:                                dest = ip->ip_dst.s_addr;
                   1424:                        /*
                   1425:                         * Router requirements says to only send host
                   1426:                         * redirects.
                   1427:                         */
                   1428:                        type = ICMP_REDIRECT;
                   1429:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1430: #ifdef DIAGNOSTIC
1.77      thorpej  1431:                        if (ipprintfs)
                   1432:                                printf("redirect (%d) to %x\n", code,
                   1433:                                    (u_int32_t)dest);
1.1       cgd      1434: #endif
                   1435:                }
                   1436:        }
                   1437:
1.89      itojun   1438: #ifdef IPSEC
1.103     itojun   1439:        /* Don't lookup socket in forwading case */
                   1440:        ipsec_setsocket(m, NULL);
                   1441: #endif
1.27      thorpej  1442:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1443:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1444:        if (error)
                   1445:                ipstat.ips_cantforward++;
                   1446:        else {
                   1447:                ipstat.ips_forward++;
                   1448:                if (type)
                   1449:                        ipstat.ips_redirectsent++;
                   1450:                else {
1.63      matt     1451:                        if (mcopy) {
                   1452: #ifdef GATEWAY
1.64      thorpej  1453:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1454:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1455: #endif
1.1       cgd      1456:                                m_freem(mcopy);
1.63      matt     1457:                        }
1.1       cgd      1458:                        return;
                   1459:                }
                   1460:        }
                   1461:        if (mcopy == NULL)
                   1462:                return;
1.13      mycroft  1463:        destifp = NULL;
                   1464:
1.1       cgd      1465:        switch (error) {
                   1466:
                   1467:        case 0:                         /* forwarded, but need redirect */
                   1468:                /* type, code set above */
                   1469:                break;
                   1470:
                   1471:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1472:        case EHOSTUNREACH:
                   1473:        case ENETDOWN:
                   1474:        case EHOSTDOWN:
                   1475:        default:
                   1476:                type = ICMP_UNREACH;
                   1477:                code = ICMP_UNREACH_HOST;
                   1478:                break;
                   1479:
                   1480:        case EMSGSIZE:
                   1481:                type = ICMP_UNREACH;
                   1482:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1483: #ifndef IPSEC
1.13      mycroft  1484:                if (ipforward_rt.ro_rt)
                   1485:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1486: #else
                   1487:                /*
                   1488:                 * If the packet is routed over IPsec tunnel, tell the
                   1489:                 * originator the tunnel MTU.
                   1490:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1491:                 * XXX quickhack!!!
                   1492:                 */
                   1493:                if (ipforward_rt.ro_rt) {
                   1494:                        struct secpolicy *sp;
                   1495:                        int ipsecerror;
1.95      itojun   1496:                        size_t ipsechdr;
1.89      itojun   1497:                        struct route *ro;
                   1498:
                   1499:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.95      itojun   1500:                                                    IPSEC_DIR_OUTBOUND,
                   1501:                                                    IP_FORWARDING,
                   1502:                                                    &ipsecerror);
1.89      itojun   1503:
                   1504:                        if (sp == NULL)
                   1505:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1506:                        else {
                   1507:                                /* count IPsec header size */
1.95      itojun   1508:                                ipsechdr = ipsec4_hdrsiz(mcopy,
                   1509:                                                         IPSEC_DIR_OUTBOUND,
                   1510:                                                         NULL);
1.89      itojun   1511:
                   1512:                                /*
                   1513:                                 * find the correct route for outer IPv4
                   1514:                                 * header, compute tunnel MTU.
                   1515:                                 *
                   1516:                                 * XXX BUG ALERT
                   1517:                                 * The "dummyifp" code relies upon the fact
                   1518:                                 * that icmp_error() touches only ifp->if_mtu.
                   1519:                                 */
                   1520:                                /*XXX*/
                   1521:                                destifp = NULL;
                   1522:                                if (sp->req != NULL
1.95      itojun   1523:                                 && sp->req->sav != NULL
                   1524:                                 && sp->req->sav->sah != NULL) {
                   1525:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1526:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1527:                                                dummyifp.if_mtu =
                   1528:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1529:                                                dummyifp.if_mtu -= ipsechdr;
                   1530:                                                destifp = &dummyifp;
                   1531:                                        }
                   1532:                                }
                   1533:
                   1534:                                key_freesp(sp);
                   1535:                        }
                   1536:                }
                   1537: #endif /*IPSEC*/
1.1       cgd      1538:                ipstat.ips_cantfrag++;
                   1539:                break;
                   1540:
                   1541:        case ENOBUFS:
                   1542:                type = ICMP_SOURCEQUENCH;
                   1543:                code = 0;
                   1544:                break;
                   1545:        }
1.13      mycroft  1546:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1547: }
                   1548:
                   1549: void
                   1550: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1551:        struct inpcb *inp;
                   1552:        struct mbuf **mp;
                   1553:        struct ip *ip;
                   1554:        struct mbuf *m;
1.44      thorpej  1555: {
                   1556:
                   1557:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1558:                struct timeval tv;
                   1559:
                   1560:                microtime(&tv);
                   1561:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1562:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1563:                if (*mp)
                   1564:                        mp = &(*mp)->m_next;
                   1565:        }
                   1566:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1567:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1568:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1569:                if (*mp)
                   1570:                        mp = &(*mp)->m_next;
                   1571:        }
                   1572: #ifdef notyet
                   1573:        /*
                   1574:         * XXX
                   1575:         * Moving these out of udp_input() made them even more broken
                   1576:         * than they already were.
                   1577:         *      - fenner@parc.xerox.com
                   1578:         */
                   1579:        /* options were tossed already */
                   1580:        if (inp->inp_flags & INP_RECVOPTS) {
                   1581:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1582:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1583:                if (*mp)
                   1584:                        mp = &(*mp)->m_next;
                   1585:        }
                   1586:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1587:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1588:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1589:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1590:                if (*mp)
                   1591:                        mp = &(*mp)->m_next;
                   1592:        }
                   1593: #endif
                   1594:        if (inp->inp_flags & INP_RECVIF) {
                   1595:                struct sockaddr_dl sdl;
                   1596:
                   1597:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1598:                sdl.sdl_family = AF_LINK;
                   1599:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1600:                    m->m_pkthdr.rcvif->if_index : 0;
                   1601:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1602:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1603:                    IP_RECVIF, IPPROTO_IP);
                   1604:                if (*mp)
                   1605:                        mp = &(*mp)->m_next;
                   1606:        }
1.13      mycroft  1607: }
                   1608:
                   1609: int
                   1610: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1611:        int *name;
                   1612:        u_int namelen;
                   1613:        void *oldp;
                   1614:        size_t *oldlenp;
                   1615:        void *newp;
                   1616:        size_t newlen;
                   1617: {
1.88      sommerfe 1618:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1619:
1.54      lukem    1620:        int error, old;
                   1621:
1.13      mycroft  1622:        /* All sysctl names at this level are terminal. */
                   1623:        if (namelen != 1)
                   1624:                return (ENOTDIR);
                   1625:
                   1626:        switch (name[0]) {
                   1627:        case IPCTL_FORWARDING:
                   1628:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1629:        case IPCTL_SENDREDIRECTS:
                   1630:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1631:                        &ipsendredirects));
                   1632:        case IPCTL_DEFTTL:
                   1633:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1634: #ifdef notyet
                   1635:        case IPCTL_DEFMTU:
                   1636:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1637: #endif
1.26      thorpej  1638:        case IPCTL_FORWSRCRT:
1.47      cjs      1639:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1640:                if (securelevel > 0)
1.46      cjs      1641:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1642:                            ip_forwsrcrt));
                   1643:                else
                   1644:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1645:                            &ip_forwsrcrt));
1.27      thorpej  1646:        case IPCTL_DIRECTEDBCAST:
                   1647:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1648:                    &ip_directedbcast));
1.47      cjs      1649:        case IPCTL_ALLOWSRCRT:
                   1650:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1651:                    &ip_allowsrcrt));
1.52      thorpej  1652:        case IPCTL_SUBNETSARELOCAL:
                   1653:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1654:                    &subnetsarelocal));
1.53      kml      1655:        case IPCTL_MTUDISC:
1.60      kml      1656:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1657:                    &ip_mtudisc);
                   1658:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
                   1659:                        ip_mtudisc_timeout_q =
                   1660:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1661:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1662:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1663:                        ip_mtudisc_timeout_q = NULL;
                   1664:                }
                   1665:                return error;
1.54      lukem    1666:        case IPCTL_ANONPORTMIN:
                   1667:                old = anonportmin;
                   1668:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
                   1669:                if (anonportmin >= anonportmax || anonportmin > 65535
                   1670: #ifndef IPNOPRIVPORTS
                   1671:                    || anonportmin < IPPORT_RESERVED
                   1672: #endif
                   1673:                    ) {
                   1674:                        anonportmin = old;
                   1675:                        return (EINVAL);
                   1676:                }
                   1677:                return (error);
                   1678:        case IPCTL_ANONPORTMAX:
                   1679:                old = anonportmax;
                   1680:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
                   1681:                if (anonportmin >= anonportmax || anonportmax > 65535
                   1682: #ifndef IPNOPRIVPORTS
                   1683:                    || anonportmax < IPPORT_RESERVED
                   1684: #endif
                   1685:                    ) {
                   1686:                        anonportmax = old;
                   1687:                        return (EINVAL);
                   1688:                }
1.60      kml      1689:                return (error);
                   1690:        case IPCTL_MTUDISCTIMEOUT:
                   1691:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1692:                   &ip_mtudisc_timeout);
                   1693:                if (ip_mtudisc_timeout_q != NULL)
                   1694:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1695:                                              ip_mtudisc_timeout);
1.54      lukem    1696:                return (error);
1.65      matt     1697: #ifdef GATEWAY
                   1698:        case IPCTL_MAXFLOWS:
1.67      thorpej  1699:            {
                   1700:                int s;
                   1701:
1.65      matt     1702:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1703:                   &ip_maxflows);
1.67      thorpej  1704:                s = splsoftnet();
1.65      matt     1705:                ipflow_reap(0);
1.67      thorpej  1706:                splx(s);
1.65      matt     1707:                return (error);
1.67      thorpej  1708:            }
1.89      itojun   1709: #endif
1.90      itojun   1710:        case IPCTL_HOSTZEROBROADCAST:
                   1711:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1712:                    &hostzeroisbroadcast));
1.89      itojun   1713: #if NGIF > 0
                   1714:        case IPCTL_GIF_TTL:
                   1715:                return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1716:                                  &ip_gif_ttl));
1.65      matt     1717: #endif
1.88      sommerfe 1718:
1.13      mycroft  1719:        default:
                   1720:                return (EOPNOTSUPP);
                   1721:        }
                   1722:        /* NOTREACHED */
1.1       cgd      1723: }

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