[BACK]Return to ip_input.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / netinet

Annotation of src/sys/netinet/ip_input.c, Revision 1.163

1.163   ! itojun      1: /*     $NetBSD: ip_input.c,v 1.162 2002/11/12 01:57:07 itojun Exp $    */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      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.
1.152     itojun     18:  *
1.89      itojun     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:  */
1.141     lukem     103:
                    104: #include <sys/cdefs.h>
1.163   ! itojun    105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.162 2002/11/12 01:57:07 itojun Exp $");
1.55      scottr    106:
1.62      matt      107: #include "opt_gateway.h"
1.69      mrg       108: #include "opt_pfil_hooks.h"
1.91      thorpej   109: #include "opt_ipsec.h"
1.55      scottr    110: #include "opt_mrouting.h"
1.135     thorpej   111: #include "opt_inet_csum.h"
1.1       cgd       112:
1.5       mycroft   113: #include <sys/param.h>
                    114: #include <sys/systm.h>
                    115: #include <sys/malloc.h>
                    116: #include <sys/mbuf.h>
                    117: #include <sys/domain.h>
                    118: #include <sys/protosw.h>
                    119: #include <sys/socket.h>
1.44      thorpej   120: #include <sys/socketvar.h>
1.5       mycroft   121: #include <sys/errno.h>
                    122: #include <sys/time.h>
                    123: #include <sys/kernel.h>
1.72      thorpej   124: #include <sys/pool.h>
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"
1.144     martin    142: #include <net/if_gre.h>
                    143: #include "gre.h"
1.111     jdolecek  144:
                    145: #ifdef MROUTING
                    146: #include <netinet/ip_mroute.h>
                    147: #endif
1.89      itojun    148:
                    149: #ifdef IPSEC
                    150: #include <netinet6/ipsec.h>
                    151: #include <netkey/key.h>
                    152: #endif
1.44      thorpej   153:
1.1       cgd       154: #ifndef        IPFORWARDING
                    155: #ifdef GATEWAY
                    156: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    157: #else /* GATEWAY */
                    158: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    159: #endif /* GATEWAY */
                    160: #endif /* IPFORWARDING */
                    161: #ifndef        IPSENDREDIRECTS
                    162: #define        IPSENDREDIRECTS 1
                    163: #endif
1.26      thorpej   164: #ifndef IPFORWSRCRT
1.47      cjs       165: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    166: #endif
                    167: #ifndef IPALLOWSRCRT
1.48      mrg       168: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   169: #endif
1.53      kml       170: #ifndef IPMTUDISC
1.153     itojun    171: #define IPMTUDISC      1
1.53      kml       172: #endif
1.60      kml       173: #ifndef IPMTUDISCTIMEOUT
1.61      kml       174: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       175: #endif
1.53      kml       176:
1.27      thorpej   177: /*
                    178:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    179:  * configuration using this option will Just Work.
                    180:  */
                    181: #ifndef IPDIRECTEDBCAST
                    182: #ifdef DIRECTED_BROADCAST
                    183: #define IPDIRECTEDBCAST        1
                    184: #else
                    185: #define        IPDIRECTEDBCAST 0
                    186: #endif /* DIRECTED_BROADCAST */
                    187: #endif /* IPDIRECTEDBCAST */
1.1       cgd       188: int    ipforwarding = IPFORWARDING;
                    189: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   190: int    ip_defttl = IPDEFTTL;
1.26      thorpej   191: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   192: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       193: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       194: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    195: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       196: #ifdef DIAGNOSTIC
                    197: int    ipprintfs = 0;
                    198: #endif
                    199:
1.60      kml       200: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    201:
1.1       cgd       202: extern struct domain inetdomain;
                    203: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      204: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    205: int    in_ifaddrentries;                       /* total number of addrs */
1.22      mycroft   206: struct in_ifaddrhead in_ifaddr;
1.57      tls       207: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13      mycroft   208: struct ifqueue ipintrq;
1.63      matt      209: struct ipstat  ipstat;
                    210: u_int16_t      ip_id;
1.75      thorpej   211:
1.121     thorpej   212: #ifdef PFIL_HOOKS
                    213: struct pfil_head inet_pfil_hook;
                    214: #endif
                    215:
1.63      matt      216: struct ipqhead ipq;
1.75      thorpej   217: int    ipq_locked;
1.131     itojun    218: int    ip_nfragpackets = 0;
1.133     itojun    219: int    ip_maxfragpackets = 200;
1.75      thorpej   220:
                    221: static __inline int ipq_lock_try __P((void));
                    222: static __inline void ipq_unlock __P((void));
                    223:
                    224: static __inline int
                    225: ipq_lock_try()
                    226: {
                    227:        int s;
                    228:
1.132     thorpej   229:        /*
1.149     wiz       230:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   231:         * mbuf allocation.
                    232:         */
                    233:        s = splvm();
1.75      thorpej   234:        if (ipq_locked) {
                    235:                splx(s);
                    236:                return (0);
                    237:        }
                    238:        ipq_locked = 1;
                    239:        splx(s);
                    240:        return (1);
                    241: }
                    242:
                    243: static __inline void
                    244: ipq_unlock()
                    245: {
                    246:        int s;
                    247:
1.132     thorpej   248:        s = splvm();
1.75      thorpej   249:        ipq_locked = 0;
                    250:        splx(s);
                    251: }
                    252:
                    253: #ifdef DIAGNOSTIC
                    254: #define        IPQ_LOCK()                                                      \
                    255: do {                                                                   \
                    256:        if (ipq_lock_try() == 0) {                                      \
                    257:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    258:                panic("ipq_lock");                                      \
                    259:        }                                                               \
1.159     perry     260: } while (/*CONSTCOND*/ 0)
1.75      thorpej   261: #define        IPQ_LOCK_CHECK()                                                \
                    262: do {                                                                   \
                    263:        if (ipq_locked == 0) {                                          \
                    264:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    265:                panic("ipq lock check");                                \
                    266:        }                                                               \
1.159     perry     267: } while (/*CONSTCOND*/ 0)
1.75      thorpej   268: #else
                    269: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    270: #define        IPQ_LOCK_CHECK()        /* nothing */
                    271: #endif
                    272:
                    273: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       274:
1.72      thorpej   275: struct pool ipqent_pool;
                    276:
1.135     thorpej   277: #ifdef INET_CSUM_COUNTERS
                    278: #include <sys/device.h>
                    279:
                    280: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    281:     NULL, "inet", "hwcsum bad");
                    282: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    283:     NULL, "inet", "hwcsum ok");
                    284: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    285:     NULL, "inet", "swcsum");
                    286:
                    287: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    288:
                    289: #else
                    290:
                    291: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    292:
                    293: #endif /* INET_CSUM_COUNTERS */
                    294:
1.1       cgd       295: /*
                    296:  * We need to save the IP options in case a protocol wants to respond
                    297:  * to an incoming packet over the same route if the packet got here
                    298:  * using IP source routing.  This allows connection establishment and
                    299:  * maintenance when the remote end is on a network that is not known
                    300:  * to us.
                    301:  */
                    302: int    ip_nhops = 0;
                    303: static struct ip_srcrt {
                    304:        struct  in_addr dst;                    /* final destination */
                    305:        char    nop;                            /* one NOP to align */
                    306:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    307:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    308: } ip_srcrt;
                    309:
1.13      mycroft   310: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   311:
1.1       cgd       312: /*
                    313:  * IP initialization: fill in IP protocol switch table.
                    314:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    315:  */
1.8       mycroft   316: void
1.1       cgd       317: ip_init()
                    318: {
1.109     augustss  319:        struct protosw *pr;
                    320:        int i;
1.1       cgd       321:
1.72      thorpej   322:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   323:            NULL);
1.72      thorpej   324:
1.1       cgd       325:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    326:        if (pr == 0)
                    327:                panic("ip_init");
                    328:        for (i = 0; i < IPPROTO_MAX; i++)
                    329:                ip_protox[i] = pr - inetsw;
                    330:        for (pr = inetdomain.dom_protosw;
                    331:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    332:                if (pr->pr_domain->dom_family == PF_INET &&
                    333:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    334:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       335:        LIST_INIT(&ipq);
1.1       cgd       336:        ip_id = time.tv_sec & 0xffff;
                    337:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   338:        TAILQ_INIT(&in_ifaddr);
1.120     ad        339:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    340:            M_WAITOK, &in_ifaddrhash);
1.160     itojun    341:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   342: #ifdef GATEWAY
                    343:        ipflow_init();
                    344: #endif
1.121     thorpej   345:
                    346: #ifdef PFIL_HOOKS
                    347:        /* Register our Packet Filter hook. */
1.126     thorpej   348:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    349:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   350:        i = pfil_head_register(&inet_pfil_hook);
                    351:        if (i != 0)
                    352:                printf("ip_init: WARNING: unable to register pfil hook, "
                    353:                    "error %d\n", i);
                    354: #endif /* PFIL_HOOKS */
1.135     thorpej   355:
                    356: #ifdef INET_CSUM_COUNTERS
                    357:        evcnt_attach_static(&ip_hwcsum_bad);
                    358:        evcnt_attach_static(&ip_hwcsum_ok);
                    359:        evcnt_attach_static(&ip_swcsum);
                    360: #endif /* INET_CSUM_COUNTERS */
1.1       cgd       361: }
                    362:
                    363: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    364: struct route ipforward_rt;
                    365:
                    366: /*
1.89      itojun    367:  * IP software interrupt routine
                    368:  */
                    369: void
                    370: ipintr()
                    371: {
                    372:        int s;
                    373:        struct mbuf *m;
                    374:
                    375:        while (1) {
1.132     thorpej   376:                s = splnet();
1.89      itojun    377:                IF_DEQUEUE(&ipintrq, m);
                    378:                splx(s);
                    379:                if (m == 0)
                    380:                        return;
                    381:                ip_input(m);
                    382:        }
                    383: }
                    384:
                    385: /*
1.1       cgd       386:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    387:  * try to reassemble.  Process options.  Pass to next level.
                    388:  */
1.8       mycroft   389: void
1.89      itojun    390: ip_input(struct mbuf *m)
1.1       cgd       391: {
1.109     augustss  392:        struct ip *ip = NULL;
                    393:        struct ipq *fp;
                    394:        struct in_ifaddr *ia;
                    395:        struct ifaddr *ifa;
1.25      cgd       396:        struct ipqent *ipqe;
1.89      itojun    397:        int hlen = 0, mff, len;
1.100     itojun    398:        int downmatch;
1.1       cgd       399:
                    400: #ifdef DIAGNOSTIC
                    401:        if ((m->m_flags & M_PKTHDR) == 0)
                    402:                panic("ipintr no HDR");
                    403: #endif
1.89      itojun    404: #ifdef IPSEC
                    405:        /*
                    406:         * should the inner packet be considered authentic?
                    407:         * see comment in ah4_input().
                    408:         */
                    409:        if (m) {
                    410:                m->m_flags &= ~M_AUTHIPHDR;
                    411:                m->m_flags &= ~M_AUTHIPDGM;
                    412:        }
                    413: #endif
1.1       cgd       414:        /*
                    415:         * If no IP addresses have been set yet but the interfaces
                    416:         * are receiving, can't do anything with incoming packets yet.
                    417:         */
1.140     matt      418:        if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1       cgd       419:                goto bad;
                    420:        ipstat.ips_total++;
1.154     thorpej   421:        /*
                    422:         * If the IP header is not aligned, slurp it up into a new
                    423:         * mbuf with space for link headers, in the event we forward
                    424:         * it.  Otherwise, if it is aligned, make sure the entire
                    425:         * base IP header is in the first mbuf of the chain.
                    426:         */
                    427:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    428:                if ((m = m_copyup(m, sizeof(struct ip),
                    429:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    430:                        /* XXXJRT new stat, please */
                    431:                        ipstat.ips_toosmall++;
                    432:                        return;
                    433:                }
                    434:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    435:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    436:                        ipstat.ips_toosmall++;
                    437:                        return;
                    438:                }
1.1       cgd       439:        }
                    440:        ip = mtod(m, struct ip *);
1.13      mycroft   441:        if (ip->ip_v != IPVERSION) {
                    442:                ipstat.ips_badvers++;
                    443:                goto bad;
                    444:        }
1.1       cgd       445:        hlen = ip->ip_hl << 2;
                    446:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    447:                ipstat.ips_badhlen++;
                    448:                goto bad;
                    449:        }
                    450:        if (hlen > m->m_len) {
                    451:                if ((m = m_pullup(m, hlen)) == 0) {
                    452:                        ipstat.ips_badhlen++;
1.89      itojun    453:                        return;
1.1       cgd       454:                }
                    455:                ip = mtod(m, struct ip *);
                    456:        }
1.98      thorpej   457:
1.85      hwr       458:        /*
1.99      thorpej   459:         * RFC1122: packets with a multicast source address are
1.98      thorpej   460:         * not allowed.
1.85      hwr       461:         */
                    462:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    463:                ipstat.ips_badaddr++;
1.85      hwr       464:                goto bad;
1.129     itojun    465:        }
                    466:
                    467:        /* 127/8 must not appear on wire - RFC1122 */
                    468:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    469:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    470:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    471:                        ipstat.ips_badaddr++;
1.129     itojun    472:                        goto bad;
1.130     itojun    473:                }
1.85      hwr       474:        }
                    475:
1.135     thorpej   476:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   477:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   478:                 M_CSUM_IPv4_BAD)) {
                    479:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    480:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    481:                goto badcsum;
                    482:
                    483:        case M_CSUM_IPv4:
                    484:                /* Checksum was okay. */
                    485:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    486:                break;
                    487:
                    488:        default:
                    489:                /* Must compute it ourselves. */
                    490:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    491:                if (in_cksum(m, hlen) != 0)
                    492:                        goto bad;
                    493:                break;
1.1       cgd       494:        }
                    495:
1.121     thorpej   496:        /* Retrieve the packet length. */
                    497:        len = ntohs(ip->ip_len);
1.81      proff     498:
                    499:        /*
                    500:         * Check for additional length bogosity
                    501:         */
1.84      proff     502:        if (len < hlen) {
1.81      proff     503:                ipstat.ips_badlen++;
                    504:                goto bad;
                    505:        }
1.1       cgd       506:
                    507:        /*
                    508:         * Check that the amount of data in the buffers
                    509:         * is as at least much as the IP header would have us expect.
                    510:         * Trim mbufs if longer than we expect.
                    511:         * Drop packet if shorter than we expect.
                    512:         */
1.35      mycroft   513:        if (m->m_pkthdr.len < len) {
1.1       cgd       514:                ipstat.ips_tooshort++;
                    515:                goto bad;
                    516:        }
1.35      mycroft   517:        if (m->m_pkthdr.len > len) {
1.1       cgd       518:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   519:                        m->m_len = len;
                    520:                        m->m_pkthdr.len = len;
1.1       cgd       521:                } else
1.35      mycroft   522:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       523:        }
                    524:
1.94      itojun    525: #ifdef IPSEC
1.149     wiz       526:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    527:        m->m_flags &= ~M_CANFASTFWD;
                    528: #else
1.64      thorpej   529:        /*
                    530:         * Assume that we can create a fast-forward IP flow entry
                    531:         * based on this packet.
                    532:         */
                    533:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    534: #endif
1.64      thorpej   535:
1.36      mrg       536: #ifdef PFIL_HOOKS
1.33      mrg       537:        /*
1.64      thorpej   538:         * Run through list of hooks for input packets.  If there are any
                    539:         * filters which require that additional packets in the flow are
                    540:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    541:         * Note that filters must _never_ set this flag, as another filter
                    542:         * in the list may have previously cleared it.
1.33      mrg       543:         */
1.127     itojun    544:        /*
                    545:         * let ipfilter look at packet on the wire,
                    546:         * not the decapsulated packet.
                    547:         */
                    548: #ifdef IPSEC
1.136     itojun    549:        if (!ipsec_getnhist(m))
1.127     itojun    550: #else
                    551:        if (1)
                    552: #endif
                    553:        {
                    554:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
                    555:                                   PFIL_IN) != 0)
1.121     thorpej   556:                return;
1.127     itojun    557:                if (m == NULL)
                    558:                        return;
                    559:                ip = mtod(m, struct ip *);
1.142     darrenr   560:                hlen = ip->ip_hl << 2;
1.127     itojun    561:        }
1.36      mrg       562: #endif /* PFIL_HOOKS */
1.123     thorpej   563:
                    564: #ifdef ALTQ
                    565:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    566:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    567:                /* packet dropped by traffic conditioner */
                    568:                return;
                    569:        }
                    570: #endif
1.121     thorpej   571:
                    572:        /*
1.1       cgd       573:         * Process options and, if not destined for us,
                    574:         * ship it on.  ip_dooptions returns 1 when an
                    575:         * error was detected (causing an icmp message
                    576:         * to be sent and the original packet to be freed).
                    577:         */
                    578:        ip_nhops = 0;           /* for source routed packets */
                    579:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    580:                return;
1.1       cgd       581:
                    582:        /*
                    583:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    584:         *
                    585:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    586:         * The behavior here is to treat addresses on !IFF_UP interface
                    587:         * as not mine.
1.1       cgd       588:         */
1.100     itojun    589:        downmatch = 0;
1.140     matt      590:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    591:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    592:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    593:                                break;
1.100     itojun    594:                        else
                    595:                                downmatch++;
1.97      itojun    596:                }
                    597:        }
1.86      thorpej   598:        if (ia != NULL)
                    599:                goto ours;
1.57      tls       600:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      601:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    602:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    603:                                continue;
1.57      tls       604:                        ia = ifatoia(ifa);
1.35      mycroft   605:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    606:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   607:                            /*
                    608:                             * Look for all-0's host part (old broadcast addr),
                    609:                             * either for subnet or net.
                    610:                             */
                    611:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   612:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       613:                                goto ours;
1.57      tls       614:                        /*
                    615:                         * An interface with IP address zero accepts
                    616:                         * all packets that arrive on that interface.
                    617:                         */
                    618:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    619:                                goto ours;
1.1       cgd       620:                }
                    621:        }
1.18      mycroft   622:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   623:                struct in_multi *inm;
                    624: #ifdef MROUTING
                    625:                extern struct socket *ip_mrouter;
1.10      brezak    626:
1.147     matt      627:                if (M_READONLY(m)) {
1.10      brezak    628:                        if ((m = m_pullup(m, hlen)) == 0) {
                    629:                                ipstat.ips_toosmall++;
1.89      itojun    630:                                return;
1.10      brezak    631:                        }
                    632:                        ip = mtod(m, struct ip *);
                    633:                }
1.4       hpeyerl   634:
                    635:                if (ip_mrouter) {
                    636:                        /*
                    637:                         * If we are acting as a multicast router, all
                    638:                         * incoming multicast packets are passed to the
                    639:                         * kernel-level multicast forwarding function.
                    640:                         * The packet is returned (relatively) intact; if
                    641:                         * ip_mforward() returns a non-zero value, the packet
                    642:                         * must be discarded, else it may be accepted below.
                    643:                         *
                    644:                         * (The IP ident field is put in the same byte order
                    645:                         * as expected when ip_mforward() is called from
                    646:                         * ip_output().)
                    647:                         */
1.13      mycroft   648:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    649:                                ipstat.ips_cantforward++;
1.4       hpeyerl   650:                                m_freem(m);
1.89      itojun    651:                                return;
1.4       hpeyerl   652:                        }
                    653:
                    654:                        /*
                    655:                         * The process-level routing demon needs to receive
                    656:                         * all multicast IGMP packets, whether or not this
                    657:                         * host belongs to their destination groups.
                    658:                         */
                    659:                        if (ip->ip_p == IPPROTO_IGMP)
                    660:                                goto ours;
1.13      mycroft   661:                        ipstat.ips_forward++;
1.4       hpeyerl   662:                }
                    663: #endif
                    664:                /*
                    665:                 * See if we belong to the destination multicast group on the
                    666:                 * arrival interface.
                    667:                 */
                    668:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    669:                if (inm == NULL) {
1.13      mycroft   670:                        ipstat.ips_cantforward++;
1.4       hpeyerl   671:                        m_freem(m);
1.89      itojun    672:                        return;
1.4       hpeyerl   673:                }
                    674:                goto ours;
                    675:        }
1.19      mycroft   676:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   677:            in_nullhost(ip->ip_dst))
1.1       cgd       678:                goto ours;
                    679:
                    680:        /*
                    681:         * Not for us; forward if possible and desirable.
                    682:         */
                    683:        if (ipforwarding == 0) {
                    684:                ipstat.ips_cantforward++;
                    685:                m_freem(m);
1.100     itojun    686:        } else {
                    687:                /*
                    688:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    689:                 * and there's no IFF_UP interface that matches ip_dst,
                    690:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    691:                 * forwarding loop till TTL goes to 0.
                    692:                 */
                    693:                if (downmatch) {
                    694:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    695:                        ipstat.ips_cantforward++;
                    696:                        return;
                    697:                }
1.145     itojun    698: #ifdef IPSEC
                    699:                if (ipsec4_in_reject(m, NULL)) {
                    700:                        ipsecstat.in_polvio++;
                    701:                        goto bad;
                    702:                }
                    703: #endif
                    704:
1.1       cgd       705:                ip_forward(m, 0);
1.100     itojun    706:        }
1.89      itojun    707:        return;
1.1       cgd       708:
                    709: ours:
                    710:        /*
                    711:         * If offset or IP_MF are set, must reassemble.
                    712:         * Otherwise, nothing need be done.
                    713:         * (We could look in the reassembly queue to see
                    714:         * if the packet was previously fragmented,
                    715:         * but it's not worth the time; just let them time out.)
                    716:         */
1.155     itojun    717:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    718:                if (M_READONLY(m)) {
                    719:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    720:                                ipstat.ips_toosmall++;
                    721:                                goto bad;
                    722:                        }
                    723:                        ip = mtod(m, struct ip *);
                    724:                }
                    725:
1.1       cgd       726:                /*
                    727:                 * Look for queue of fragments
                    728:                 * of this datagram.
                    729:                 */
1.75      thorpej   730:                IPQ_LOCK();
1.140     matt      731:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       732:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   733:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    734:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       735:                            ip->ip_p == fp->ipq_p)
                    736:                                goto found;
                    737:                fp = 0;
                    738: found:
                    739:
                    740:                /*
                    741:                 * Adjust ip_len to not reflect header,
1.25      cgd       742:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       743:                 * convert offset of this to bytes.
                    744:                 */
1.155     itojun    745:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    746:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       747:                if (mff) {
1.16      cgd       748:                        /*
                    749:                         * Make sure that fragments have a data length
                    750:                         * that's a non-zero multiple of 8 bytes.
                    751:                         */
1.155     itojun    752:                        if (ntohs(ip->ip_len) == 0 ||
                    753:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       754:                                ipstat.ips_badfrags++;
1.75      thorpej   755:                                IPQ_UNLOCK();
1.16      cgd       756:                                goto bad;
                    757:                        }
                    758:                }
1.155     itojun    759:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       760:
                    761:                /*
                    762:                 * If datagram marked as having more fragments
                    763:                 * or if this is not the first fragment,
                    764:                 * attempt reassembly; if it succeeds, proceed.
                    765:                 */
1.155     itojun    766:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       767:                        ipstat.ips_fragments++;
1.72      thorpej   768:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       769:                        if (ipqe == NULL) {
                    770:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   771:                                IPQ_UNLOCK();
1.25      cgd       772:                                goto bad;
                    773:                        }
                    774:                        ipqe->ipqe_mff = mff;
1.50      thorpej   775:                        ipqe->ipqe_m = m;
1.25      cgd       776:                        ipqe->ipqe_ip = ip;
1.50      thorpej   777:                        m = ip_reass(ipqe, fp);
1.75      thorpej   778:                        if (m == 0) {
                    779:                                IPQ_UNLOCK();
1.89      itojun    780:                                return;
1.75      thorpej   781:                        }
1.13      mycroft   782:                        ipstat.ips_reassembled++;
1.50      thorpej   783:                        ip = mtod(m, struct ip *);
1.74      thorpej   784:                        hlen = ip->ip_hl << 2;
1.155     itojun    785:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       786:                } else
                    787:                        if (fp)
                    788:                                ip_freef(fp);
1.75      thorpej   789:                IPQ_UNLOCK();
1.79      mycroft   790:        }
1.128     itojun    791:
                    792: #ifdef IPSEC
                    793:        /*
                    794:         * enforce IPsec policy checking if we are seeing last header.
                    795:         * note that we do not visit this with protocols with pcb layer
                    796:         * code - like udp/tcp/raw ip.
                    797:         */
                    798:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    799:            ipsec4_in_reject(m, NULL)) {
                    800:                ipsecstat.in_polvio++;
                    801:                goto bad;
                    802:        }
                    803: #endif
1.1       cgd       804:
                    805:        /*
                    806:         * Switch out to protocol's input routine.
                    807:         */
1.82      aidan     808: #if IFA_STATS
1.122     itojun    809:        if (ia && ip)
1.155     itojun    810:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     811: #endif
1.1       cgd       812:        ipstat.ips_delivered++;
1.89      itojun    813:     {
                    814:        int off = hlen, nh = ip->ip_p;
                    815:
                    816:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    817:        return;
                    818:     }
1.1       cgd       819: bad:
                    820:        m_freem(m);
1.135     thorpej   821:        return;
                    822:
                    823: badcsum:
                    824:        ipstat.ips_badsum++;
                    825:        m_freem(m);
1.1       cgd       826: }
                    827:
                    828: /*
                    829:  * Take incoming datagram fragment and try to
                    830:  * reassemble it into whole datagram.  If a chain for
                    831:  * reassembly of this datagram already exists, then it
                    832:  * is given as fp; otherwise have to make a chain.
                    833:  */
1.50      thorpej   834: struct mbuf *
1.25      cgd       835: ip_reass(ipqe, fp)
1.109     augustss  836:        struct ipqent *ipqe;
                    837:        struct ipq *fp;
1.1       cgd       838: {
1.109     augustss  839:        struct mbuf *m = ipqe->ipqe_m;
                    840:        struct ipqent *nq, *p, *q;
1.25      cgd       841:        struct ip *ip;
1.1       cgd       842:        struct mbuf *t;
1.25      cgd       843:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       844:        int i, next;
                    845:
1.75      thorpej   846:        IPQ_LOCK_CHECK();
                    847:
1.1       cgd       848:        /*
                    849:         * Presence of header sizes in mbufs
                    850:         * would confuse code below.
                    851:         */
                    852:        m->m_data += hlen;
                    853:        m->m_len -= hlen;
                    854:
                    855:        /*
                    856:         * If first fragment to arrive, create a reassembly queue.
                    857:         */
                    858:        if (fp == 0) {
1.131     itojun    859:                /*
                    860:                 * Enforce upper bound on number of fragmented packets
                    861:                 * for which we attempt reassembly;
                    862:                 * If maxfrag is 0, never accept fragments.
                    863:                 * If maxfrag is -1, accept all fragments without limitation.
                    864:                 */
                    865:                if (ip_maxfragpackets < 0)
                    866:                        ;
                    867:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    868:                        goto dropfrag;
                    869:                ip_nfragpackets++;
1.50      thorpej   870:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    871:                    M_FTABLE, M_NOWAIT);
                    872:                if (fp == NULL)
1.1       cgd       873:                        goto dropfrag;
1.25      cgd       874:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       875:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       876:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    877:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt      878:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd       879:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    880:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    881:                p = NULL;
1.1       cgd       882:                goto insert;
                    883:        }
                    884:
                    885:        /*
                    886:         * Find a segment which begins after this one does.
                    887:         */
1.148     matt      888:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    889:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun    890:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd       891:                        break;
                    892:
                    893:        /*
                    894:         * If there is a preceding segment, it may provide some of
                    895:         * our data already.  If so, drop the data from the incoming
                    896:         * segment.  If it provides all of our data, drop us.
                    897:         */
1.25      cgd       898:        if (p != NULL) {
1.155     itojun    899:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                    900:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd       901:                if (i > 0) {
1.155     itojun    902:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd       903:                                goto dropfrag;
1.50      thorpej   904:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun    905:                        ipqe->ipqe_ip->ip_off =
                    906:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                    907:                        ipqe->ipqe_ip->ip_len =
                    908:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd       909:                }
                    910:        }
                    911:
                    912:        /*
                    913:         * While we overlap succeeding segments trim them or,
                    914:         * if they are completely covered, dequeue them.
                    915:         */
1.155     itojun    916:        for (; q != NULL &&
                    917:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                    918:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                    919:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                    920:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                    921:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                    922:                        q->ipqe_ip->ip_len =
                    923:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                    924:                        q->ipqe_ip->ip_off =
                    925:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej   926:                        m_adj(q->ipqe_m, i);
1.1       cgd       927:                        break;
                    928:                }
1.148     matt      929:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej   930:                m_freem(q->ipqe_m);
1.148     matt      931:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej   932:                pool_put(&ipqent_pool, q);
1.1       cgd       933:        }
                    934:
                    935: insert:
                    936:        /*
                    937:         * Stick new segment in its place;
                    938:         * check for complete reassembly.
                    939:         */
1.25      cgd       940:        if (p == NULL) {
1.148     matt      941:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd       942:        } else {
1.148     matt      943:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd       944:        }
1.1       cgd       945:        next = 0;
1.148     matt      946:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    947:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun    948:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd       949:                        return (0);
1.155     itojun    950:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd       951:        }
1.25      cgd       952:        if (p->ipqe_mff)
1.1       cgd       953:                return (0);
                    954:
                    955:        /*
1.41      thorpej   956:         * Reassembly is complete.  Check for a bogus message size and
                    957:         * concatenate fragments.
1.1       cgd       958:         */
1.148     matt      959:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd       960:        ip = q->ipqe_ip;
1.41      thorpej   961:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    962:                ipstat.ips_toolong++;
                    963:                ip_freef(fp);
                    964:                return (0);
                    965:        }
1.50      thorpej   966:        m = q->ipqe_m;
1.1       cgd       967:        t = m->m_next;
                    968:        m->m_next = 0;
                    969:        m_cat(m, t);
1.148     matt      970:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   971:        pool_put(&ipqent_pool, q);
1.25      cgd       972:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   973:                t = q->ipqe_m;
1.148     matt      974:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   975:                pool_put(&ipqent_pool, q);
1.1       cgd       976:                m_cat(m, t);
                    977:        }
                    978:
                    979:        /*
                    980:         * Create header for new ip packet by
                    981:         * modifying header of first packet;
                    982:         * dequeue and discard fragment reassembly header.
                    983:         * Make header visible.
                    984:         */
1.155     itojun    985:        ip->ip_len = htons(next);
1.25      cgd       986:        ip->ip_src = fp->ipq_src;
                    987:        ip->ip_dst = fp->ipq_dst;
                    988:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   989:        FREE(fp, M_FTABLE);
1.131     itojun    990:        ip_nfragpackets--;
1.1       cgd       991:        m->m_len += (ip->ip_hl << 2);
                    992:        m->m_data -= (ip->ip_hl << 2);
                    993:        /* some debugging cruft by sklower, below, will go away soon */
                    994:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss  995:                int plen = 0;
1.50      thorpej   996:                for (t = m; t; t = t->m_next)
                    997:                        plen += t->m_len;
                    998:                m->m_pkthdr.len = plen;
1.1       cgd       999:        }
1.50      thorpej  1000:        return (m);
1.1       cgd      1001:
                   1002: dropfrag:
                   1003:        ipstat.ips_fragdropped++;
                   1004:        m_freem(m);
1.72      thorpej  1005:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1006:        return (0);
                   1007: }
                   1008:
                   1009: /*
                   1010:  * Free a fragment reassembly header and all
                   1011:  * associated datagrams.
                   1012:  */
1.8       mycroft  1013: void
1.1       cgd      1014: ip_freef(fp)
                   1015:        struct ipq *fp;
                   1016: {
1.109     augustss 1017:        struct ipqent *q, *p;
1.1       cgd      1018:
1.75      thorpej  1019:        IPQ_LOCK_CHECK();
                   1020:
1.148     matt     1021:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1022:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1023:                m_freem(q->ipqe_m);
1.148     matt     1024:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1025:                pool_put(&ipqent_pool, q);
1.1       cgd      1026:        }
1.25      cgd      1027:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1028:        FREE(fp, M_FTABLE);
1.131     itojun   1029:        ip_nfragpackets--;
1.1       cgd      1030: }
                   1031:
                   1032: /*
                   1033:  * IP timer processing;
                   1034:  * if a timer expires on a reassembly
                   1035:  * queue, discard it.
                   1036:  */
1.8       mycroft  1037: void
1.1       cgd      1038: ip_slowtimo()
                   1039: {
1.109     augustss 1040:        struct ipq *fp, *nfp;
1.24      mycroft  1041:        int s = splsoftnet();
1.1       cgd      1042:
1.75      thorpej  1043:        IPQ_LOCK();
1.140     matt     1044:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1045:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1046:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1047:                        ipstat.ips_fragtimeout++;
1.25      cgd      1048:                        ip_freef(fp);
1.1       cgd      1049:                }
                   1050:        }
1.131     itojun   1051:        /*
                   1052:         * If we are over the maximum number of fragments
                   1053:         * (due to the limit being lowered), drain off
                   1054:         * enough to get down to the new limit.
                   1055:         */
                   1056:        if (ip_maxfragpackets < 0)
                   1057:                ;
                   1058:        else {
1.140     matt     1059:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1060:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1061:        }
1.75      thorpej  1062:        IPQ_UNLOCK();
1.63      matt     1063: #ifdef GATEWAY
                   1064:        ipflow_slowtimo();
                   1065: #endif
1.1       cgd      1066:        splx(s);
                   1067: }
                   1068:
                   1069: /*
                   1070:  * Drain off all datagram fragments.
                   1071:  */
1.8       mycroft  1072: void
1.1       cgd      1073: ip_drain()
                   1074: {
                   1075:
1.75      thorpej  1076:        /*
                   1077:         * We may be called from a device's interrupt context.  If
                   1078:         * the ipq is already busy, just bail out now.
                   1079:         */
                   1080:        if (ipq_lock_try() == 0)
                   1081:                return;
                   1082:
1.140     matt     1083:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1084:                ipstat.ips_fragdropped++;
1.140     matt     1085:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1086:        }
1.75      thorpej  1087:
                   1088:        IPQ_UNLOCK();
1.1       cgd      1089: }
                   1090:
                   1091: /*
                   1092:  * Do option processing on a datagram,
                   1093:  * possibly discarding it if bad options are encountered,
                   1094:  * or forwarding it if source-routed.
                   1095:  * Returns 1 if packet has been forwarded/freed,
                   1096:  * 0 if the packet should be processed further.
                   1097:  */
1.8       mycroft  1098: int
1.1       cgd      1099: ip_dooptions(m)
                   1100:        struct mbuf *m;
                   1101: {
1.109     augustss 1102:        struct ip *ip = mtod(m, struct ip *);
                   1103:        u_char *cp, *cp0;
                   1104:        struct ip_timestamp *ipt;
                   1105:        struct in_ifaddr *ia;
1.1       cgd      1106:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1107:        struct in_addr dst;
1.1       cgd      1108:        n_time ntime;
                   1109:
1.13      mycroft  1110:        dst = ip->ip_dst;
1.1       cgd      1111:        cp = (u_char *)(ip + 1);
                   1112:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1113:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1114:                opt = cp[IPOPT_OPTVAL];
                   1115:                if (opt == IPOPT_EOL)
                   1116:                        break;
                   1117:                if (opt == IPOPT_NOP)
                   1118:                        optlen = 1;
                   1119:                else {
1.113     itojun   1120:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1121:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1122:                                goto bad;
                   1123:                        }
1.1       cgd      1124:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1125:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1126:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1127:                                goto bad;
                   1128:                        }
                   1129:                }
                   1130:                switch (opt) {
                   1131:
                   1132:                default:
                   1133:                        break;
                   1134:
                   1135:                /*
                   1136:                 * Source routing with record.
                   1137:                 * Find interface with current destination address.
                   1138:                 * If none on this machine then drop if strictly routed,
                   1139:                 * or do nothing if loosely routed.
                   1140:                 * Record interface address and bring up next address
                   1141:                 * component.  If strictly routed make sure next
                   1142:                 * address is on directly accessible net.
                   1143:                 */
                   1144:                case IPOPT_LSRR:
                   1145:                case IPOPT_SSRR:
1.47      cjs      1146:                        if (ip_allowsrcrt == 0) {
                   1147:                                type = ICMP_UNREACH;
                   1148:                                code = ICMP_UNREACH_NET_PROHIB;
                   1149:                                goto bad;
                   1150:                        }
1.114     itojun   1151:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1152:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1153:                                goto bad;
                   1154:                        }
1.1       cgd      1155:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1156:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1157:                                goto bad;
                   1158:                        }
                   1159:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1160:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1161:                        if (ia == 0) {
                   1162:                                if (opt == IPOPT_SSRR) {
                   1163:                                        type = ICMP_UNREACH;
                   1164:                                        code = ICMP_UNREACH_SRCFAIL;
                   1165:                                        goto bad;
                   1166:                                }
                   1167:                                /*
                   1168:                                 * Loose routing, and not at next destination
                   1169:                                 * yet; nothing to do except forward.
                   1170:                                 */
                   1171:                                break;
                   1172:                        }
                   1173:                        off--;                  /* 0 origin */
1.112     sommerfe 1174:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1175:                                /*
                   1176:                                 * End of source route.  Should be for us.
                   1177:                                 */
                   1178:                                save_rte(cp, ip->ip_src);
                   1179:                                break;
                   1180:                        }
                   1181:                        /*
                   1182:                         * locate outgoing interface
                   1183:                         */
                   1184:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1185:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1186:                        if (opt == IPOPT_SSRR)
                   1187:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1188:                        else
1.1       cgd      1189:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1190:                        if (ia == 0) {
                   1191:                                type = ICMP_UNREACH;
                   1192:                                code = ICMP_UNREACH_SRCFAIL;
                   1193:                                goto bad;
                   1194:                        }
                   1195:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1196:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1197:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1198:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1199:                        /*
                   1200:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1201:                         */
1.18      mycroft  1202:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1203:                        break;
                   1204:
                   1205:                case IPOPT_RR:
1.114     itojun   1206:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1207:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1208:                                goto bad;
                   1209:                        }
1.1       cgd      1210:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1211:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1212:                                goto bad;
                   1213:                        }
                   1214:                        /*
                   1215:                         * If no space remains, ignore.
                   1216:                         */
                   1217:                        off--;                  /* 0 origin */
1.112     sommerfe 1218:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1219:                                break;
                   1220:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1221:                            sizeof(ipaddr.sin_addr));
                   1222:                        /*
                   1223:                         * locate outgoing interface; if we're the destination,
                   1224:                         * use the incoming interface (should be same).
                   1225:                         */
1.96      thorpej  1226:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1227:                            == NULL &&
                   1228:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1229:                                type = ICMP_UNREACH;
                   1230:                                code = ICMP_UNREACH_HOST;
                   1231:                                goto bad;
                   1232:                        }
1.20      mycroft  1233:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1234:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1235:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1236:                        break;
                   1237:
                   1238:                case IPOPT_TS:
                   1239:                        code = cp - (u_char *)ip;
                   1240:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1241:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1242:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1243:                                goto bad;
1.114     itojun   1244:                        }
                   1245:                        if (ipt->ipt_ptr < 5) {
                   1246:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1247:                                goto bad;
                   1248:                        }
1.15      cgd      1249:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1250:                                if (++ipt->ipt_oflw == 0) {
                   1251:                                        code = (u_char *)&ipt->ipt_ptr -
                   1252:                                            (u_char *)ip;
1.1       cgd      1253:                                        goto bad;
1.114     itojun   1254:                                }
1.1       cgd      1255:                                break;
                   1256:                        }
1.104     thorpej  1257:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1258:                        switch (ipt->ipt_flg) {
                   1259:
                   1260:                        case IPOPT_TS_TSONLY:
                   1261:                                break;
                   1262:
                   1263:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1264:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1265:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1266:                                        code = (u_char *)&ipt->ipt_ptr -
                   1267:                                            (u_char *)ip;
1.1       cgd      1268:                                        goto bad;
1.114     itojun   1269:                                }
1.13      mycroft  1270:                                ipaddr.sin_addr = dst;
1.96      thorpej  1271:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1272:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1273:                                if (ia == 0)
                   1274:                                        continue;
1.104     thorpej  1275:                                bcopy(&ia->ia_addr.sin_addr,
                   1276:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1277:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1278:                                break;
                   1279:
                   1280:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1281:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1282:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1283:                                        code = (u_char *)&ipt->ipt_ptr -
                   1284:                                            (u_char *)ip;
1.1       cgd      1285:                                        goto bad;
1.114     itojun   1286:                                }
1.104     thorpej  1287:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1288:                                    sizeof(struct in_addr));
1.96      thorpej  1289:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1290:                                    == NULL)
1.1       cgd      1291:                                        continue;
                   1292:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1293:                                break;
                   1294:
                   1295:                        default:
1.114     itojun   1296:                                /* XXX can't take &ipt->ipt_flg */
                   1297:                                code = (u_char *)&ipt->ipt_ptr -
                   1298:                                    (u_char *)ip + 1;
1.1       cgd      1299:                                goto bad;
                   1300:                        }
                   1301:                        ntime = iptime();
1.107     thorpej  1302:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1303:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1304:                            sizeof(n_time));
                   1305:                        ipt->ipt_ptr += sizeof(n_time);
                   1306:                }
                   1307:        }
                   1308:        if (forward) {
1.26      thorpej  1309:                if (ip_forwsrcrt == 0) {
                   1310:                        type = ICMP_UNREACH;
                   1311:                        code = ICMP_UNREACH_SRCFAIL;
                   1312:                        goto bad;
                   1313:                }
1.1       cgd      1314:                ip_forward(m, 1);
                   1315:                return (1);
1.13      mycroft  1316:        }
                   1317:        return (0);
1.1       cgd      1318: bad:
1.13      mycroft  1319:        icmp_error(m, type, code, 0, 0);
                   1320:        ipstat.ips_badoptions++;
1.1       cgd      1321:        return (1);
                   1322: }
                   1323:
                   1324: /*
                   1325:  * Given address of next destination (final or next hop),
                   1326:  * return internet address info of interface to be used to get there.
                   1327:  */
                   1328: struct in_ifaddr *
                   1329: ip_rtaddr(dst)
                   1330:         struct in_addr dst;
                   1331: {
1.109     augustss 1332:        struct sockaddr_in *sin;
1.1       cgd      1333:
1.19      mycroft  1334:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1335:
1.35      mycroft  1336:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1337:                if (ipforward_rt.ro_rt) {
                   1338:                        RTFREE(ipforward_rt.ro_rt);
                   1339:                        ipforward_rt.ro_rt = 0;
                   1340:                }
                   1341:                sin->sin_family = AF_INET;
                   1342:                sin->sin_len = sizeof(*sin);
                   1343:                sin->sin_addr = dst;
                   1344:
                   1345:                rtalloc(&ipforward_rt);
                   1346:        }
                   1347:        if (ipforward_rt.ro_rt == 0)
                   1348:                return ((struct in_ifaddr *)0);
1.19      mycroft  1349:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1350: }
                   1351:
                   1352: /*
                   1353:  * Save incoming source route for use in replies,
                   1354:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1355:  */
1.13      mycroft  1356: void
1.1       cgd      1357: save_rte(option, dst)
                   1358:        u_char *option;
                   1359:        struct in_addr dst;
                   1360: {
                   1361:        unsigned olen;
                   1362:
                   1363:        olen = option[IPOPT_OLEN];
                   1364: #ifdef DIAGNOSTIC
                   1365:        if (ipprintfs)
1.39      christos 1366:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1367: #endif /* 0 */
1.1       cgd      1368:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1369:                return;
                   1370:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1371:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1372:        ip_srcrt.dst = dst;
                   1373: }
                   1374:
                   1375: /*
                   1376:  * Retrieve incoming source route for use in replies,
                   1377:  * in the same form used by setsockopt.
                   1378:  * The first hop is placed before the options, will be removed later.
                   1379:  */
                   1380: struct mbuf *
                   1381: ip_srcroute()
                   1382: {
1.109     augustss 1383:        struct in_addr *p, *q;
                   1384:        struct mbuf *m;
1.1       cgd      1385:
                   1386:        if (ip_nhops == 0)
                   1387:                return ((struct mbuf *)0);
                   1388:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1389:        if (m == 0)
                   1390:                return ((struct mbuf *)0);
                   1391:
1.13      mycroft  1392: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1393:
                   1394:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1395:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1396:            OPTSIZ;
                   1397: #ifdef DIAGNOSTIC
                   1398:        if (ipprintfs)
1.39      christos 1399:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1400: #endif
                   1401:
                   1402:        /*
                   1403:         * First save first hop for return route
                   1404:         */
                   1405:        p = &ip_srcrt.route[ip_nhops - 1];
                   1406:        *(mtod(m, struct in_addr *)) = *p--;
                   1407: #ifdef DIAGNOSTIC
                   1408:        if (ipprintfs)
1.39      christos 1409:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1410: #endif
                   1411:
                   1412:        /*
                   1413:         * Copy option fields and padding (nop) to mbuf.
                   1414:         */
                   1415:        ip_srcrt.nop = IPOPT_NOP;
                   1416:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1417:        bcopy((caddr_t)&ip_srcrt.nop,
                   1418:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1419:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1420:            sizeof(struct in_addr) + OPTSIZ);
                   1421: #undef OPTSIZ
                   1422:        /*
                   1423:         * Record return path as an IP source route,
                   1424:         * reversing the path (pointers are now aligned).
                   1425:         */
                   1426:        while (p >= ip_srcrt.route) {
                   1427: #ifdef DIAGNOSTIC
                   1428:                if (ipprintfs)
1.39      christos 1429:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1430: #endif
                   1431:                *q++ = *p--;
                   1432:        }
                   1433:        /*
                   1434:         * Last hop goes to final destination.
                   1435:         */
                   1436:        *q = ip_srcrt.dst;
                   1437: #ifdef DIAGNOSTIC
                   1438:        if (ipprintfs)
1.39      christos 1439:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1440: #endif
                   1441:        return (m);
                   1442: }
                   1443:
                   1444: /*
                   1445:  * Strip out IP options, at higher
                   1446:  * level protocol in the kernel.
                   1447:  * Second argument is buffer to which options
                   1448:  * will be moved, and return value is their length.
                   1449:  * XXX should be deleted; last arg currently ignored.
                   1450:  */
1.8       mycroft  1451: void
1.1       cgd      1452: ip_stripoptions(m, mopt)
1.109     augustss 1453:        struct mbuf *m;
1.1       cgd      1454:        struct mbuf *mopt;
                   1455: {
1.109     augustss 1456:        int i;
1.1       cgd      1457:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1458:        caddr_t opts;
1.1       cgd      1459:        int olen;
                   1460:
1.79      mycroft  1461:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1462:        opts = (caddr_t)(ip + 1);
                   1463:        i = m->m_len - (sizeof (struct ip) + olen);
                   1464:        bcopy(opts  + olen, opts, (unsigned)i);
                   1465:        m->m_len -= olen;
                   1466:        if (m->m_flags & M_PKTHDR)
                   1467:                m->m_pkthdr.len -= olen;
1.155     itojun   1468:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1469:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1470: }
                   1471:
1.139     matt     1472: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1473:        0,              0,              0,              0,
                   1474:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1475:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1476:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1477:        0,              0,              0,              0,
                   1478:        ENOPROTOOPT
                   1479: };
                   1480:
                   1481: /*
                   1482:  * Forward a packet.  If some error occurs return the sender
                   1483:  * an icmp packet.  Note we can't always generate a meaningful
                   1484:  * icmp message because icmp doesn't have a large enough repertoire
                   1485:  * of codes and types.
                   1486:  *
                   1487:  * If not forwarding, just drop the packet.  This could be confusing
                   1488:  * if ipforwarding was zero but some routing protocol was advancing
                   1489:  * us as a gateway to somewhere.  However, we must let the routing
                   1490:  * protocol deal with that.
                   1491:  *
                   1492:  * The srcrt parameter indicates whether the packet is being forwarded
                   1493:  * via a source route.
                   1494:  */
1.13      mycroft  1495: void
1.1       cgd      1496: ip_forward(m, srcrt)
                   1497:        struct mbuf *m;
                   1498:        int srcrt;
                   1499: {
1.109     augustss 1500:        struct ip *ip = mtod(m, struct ip *);
                   1501:        struct sockaddr_in *sin;
                   1502:        struct rtentry *rt;
1.28      christos 1503:        int error, type = 0, code = 0;
1.1       cgd      1504:        struct mbuf *mcopy;
1.13      mycroft  1505:        n_long dest;
                   1506:        struct ifnet *destifp;
1.89      itojun   1507: #ifdef IPSEC
                   1508:        struct ifnet dummyifp;
                   1509: #endif
1.135     thorpej  1510:
                   1511:        /*
                   1512:         * Clear any in-bound checksum flags for this packet.
                   1513:         */
                   1514:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1515:
1.13      mycroft  1516:        dest = 0;
1.1       cgd      1517: #ifdef DIAGNOSTIC
                   1518:        if (ipprintfs)
1.70      thorpej  1519:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1520:                    ntohl(ip->ip_src.s_addr),
                   1521:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1522: #endif
1.93      sommerfe 1523:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1524:                ipstat.ips_cantforward++;
                   1525:                m_freem(m);
                   1526:                return;
                   1527:        }
                   1528:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1529:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1530:                return;
                   1531:        }
                   1532:        ip->ip_ttl -= IPTTLDEC;
                   1533:
1.19      mycroft  1534:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1535:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1536:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1537:                if (ipforward_rt.ro_rt) {
                   1538:                        RTFREE(ipforward_rt.ro_rt);
                   1539:                        ipforward_rt.ro_rt = 0;
                   1540:                }
                   1541:                sin->sin_family = AF_INET;
1.35      mycroft  1542:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1543:                sin->sin_addr = ip->ip_dst;
                   1544:
                   1545:                rtalloc(&ipforward_rt);
                   1546:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1547:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1548:                        return;
                   1549:                }
                   1550:                rt = ipforward_rt.ro_rt;
                   1551:        }
                   1552:
                   1553:        /*
1.34      mycroft  1554:         * Save at most 68 bytes of the packet in case
1.1       cgd      1555:         * we need to generate an ICMP message to the src.
1.119     itojun   1556:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1557:         */
1.155     itojun   1558:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1559:        if (mcopy)
                   1560:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1561:
                   1562:        /*
                   1563:         * If forwarding packet using same interface that it came in on,
                   1564:         * perhaps should send a redirect to sender to shortcut a hop.
                   1565:         * Only send redirect if source is sending directly to us,
                   1566:         * and if packet was not source routed (or has any options).
                   1567:         * Also, don't send redirect if forwarding using a default route
                   1568:         * or a route modified by a redirect.
                   1569:         */
                   1570:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1571:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1572:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1573:            ipsendredirects && !srcrt) {
1.19      mycroft  1574:                if (rt->rt_ifa &&
                   1575:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1576:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1577:                        if (rt->rt_flags & RTF_GATEWAY)
                   1578:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1579:                        else
                   1580:                                dest = ip->ip_dst.s_addr;
                   1581:                        /*
                   1582:                         * Router requirements says to only send host
                   1583:                         * redirects.
                   1584:                         */
                   1585:                        type = ICMP_REDIRECT;
                   1586:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1587: #ifdef DIAGNOSTIC
1.77      thorpej  1588:                        if (ipprintfs)
                   1589:                                printf("redirect (%d) to %x\n", code,
                   1590:                                    (u_int32_t)dest);
1.1       cgd      1591: #endif
                   1592:                }
                   1593:        }
                   1594:
1.89      itojun   1595: #ifdef IPSEC
1.134     lukem    1596:        /* Don't lookup socket in forwarding case */
1.127     itojun   1597:        (void)ipsec_setsocket(m, NULL);
1.103     itojun   1598: #endif
1.27      thorpej  1599:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1600:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1601:        if (error)
                   1602:                ipstat.ips_cantforward++;
                   1603:        else {
                   1604:                ipstat.ips_forward++;
                   1605:                if (type)
                   1606:                        ipstat.ips_redirectsent++;
                   1607:                else {
1.63      matt     1608:                        if (mcopy) {
                   1609: #ifdef GATEWAY
1.64      thorpej  1610:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1611:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1612: #endif
1.1       cgd      1613:                                m_freem(mcopy);
1.63      matt     1614:                        }
1.1       cgd      1615:                        return;
                   1616:                }
                   1617:        }
                   1618:        if (mcopy == NULL)
                   1619:                return;
1.13      mycroft  1620:        destifp = NULL;
                   1621:
1.1       cgd      1622:        switch (error) {
                   1623:
                   1624:        case 0:                         /* forwarded, but need redirect */
                   1625:                /* type, code set above */
                   1626:                break;
                   1627:
                   1628:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1629:        case EHOSTUNREACH:
                   1630:        case ENETDOWN:
                   1631:        case EHOSTDOWN:
                   1632:        default:
                   1633:                type = ICMP_UNREACH;
                   1634:                code = ICMP_UNREACH_HOST;
                   1635:                break;
                   1636:
                   1637:        case EMSGSIZE:
                   1638:                type = ICMP_UNREACH;
                   1639:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1640: #ifndef IPSEC
1.13      mycroft  1641:                if (ipforward_rt.ro_rt)
                   1642:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1643: #else
                   1644:                /*
                   1645:                 * If the packet is routed over IPsec tunnel, tell the
                   1646:                 * originator the tunnel MTU.
                   1647:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1648:                 * XXX quickhack!!!
                   1649:                 */
                   1650:                if (ipforward_rt.ro_rt) {
                   1651:                        struct secpolicy *sp;
                   1652:                        int ipsecerror;
1.95      itojun   1653:                        size_t ipsechdr;
1.89      itojun   1654:                        struct route *ro;
                   1655:
                   1656:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.95      itojun   1657:                                                    IPSEC_DIR_OUTBOUND,
                   1658:                                                    IP_FORWARDING,
                   1659:                                                    &ipsecerror);
1.89      itojun   1660:
                   1661:                        if (sp == NULL)
                   1662:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1663:                        else {
                   1664:                                /* count IPsec header size */
1.95      itojun   1665:                                ipsechdr = ipsec4_hdrsiz(mcopy,
                   1666:                                                         IPSEC_DIR_OUTBOUND,
                   1667:                                                         NULL);
1.89      itojun   1668:
                   1669:                                /*
                   1670:                                 * find the correct route for outer IPv4
                   1671:                                 * header, compute tunnel MTU.
                   1672:                                 *
                   1673:                                 * XXX BUG ALERT
                   1674:                                 * The "dummyifp" code relies upon the fact
                   1675:                                 * that icmp_error() touches only ifp->if_mtu.
                   1676:                                 */
                   1677:                                /*XXX*/
                   1678:                                destifp = NULL;
                   1679:                                if (sp->req != NULL
1.95      itojun   1680:                                 && sp->req->sav != NULL
                   1681:                                 && sp->req->sav->sah != NULL) {
                   1682:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1683:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1684:                                                dummyifp.if_mtu =
1.151     itojun   1685:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1686:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1687:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1688:                                                dummyifp.if_mtu -= ipsechdr;
                   1689:                                                destifp = &dummyifp;
                   1690:                                        }
                   1691:                                }
                   1692:
                   1693:                                key_freesp(sp);
                   1694:                        }
                   1695:                }
                   1696: #endif /*IPSEC*/
1.1       cgd      1697:                ipstat.ips_cantfrag++;
                   1698:                break;
                   1699:
                   1700:        case ENOBUFS:
1.143     itojun   1701: #if 1
                   1702:                /*
                   1703:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1704:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1705:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1706:                 * or if the underlying interface is rate-limited.
1.143     itojun   1707:                 */
                   1708:                if (mcopy)
                   1709:                        m_freem(mcopy);
                   1710:                return;
                   1711: #else
1.1       cgd      1712:                type = ICMP_SOURCEQUENCH;
                   1713:                code = 0;
                   1714:                break;
1.143     itojun   1715: #endif
1.1       cgd      1716:        }
1.13      mycroft  1717:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1718: }
                   1719:
                   1720: void
                   1721: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1722:        struct inpcb *inp;
                   1723:        struct mbuf **mp;
                   1724:        struct ip *ip;
                   1725:        struct mbuf *m;
1.44      thorpej  1726: {
                   1727:
                   1728:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1729:                struct timeval tv;
                   1730:
                   1731:                microtime(&tv);
                   1732:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1733:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1734:                if (*mp)
                   1735:                        mp = &(*mp)->m_next;
                   1736:        }
                   1737:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1738:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1739:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1740:                if (*mp)
                   1741:                        mp = &(*mp)->m_next;
                   1742:        }
                   1743: #ifdef notyet
                   1744:        /*
                   1745:         * XXX
                   1746:         * Moving these out of udp_input() made them even more broken
                   1747:         * than they already were.
                   1748:         *      - fenner@parc.xerox.com
                   1749:         */
                   1750:        /* options were tossed already */
                   1751:        if (inp->inp_flags & INP_RECVOPTS) {
                   1752:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1753:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1754:                if (*mp)
                   1755:                        mp = &(*mp)->m_next;
                   1756:        }
                   1757:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1758:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1759:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1760:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1761:                if (*mp)
                   1762:                        mp = &(*mp)->m_next;
                   1763:        }
                   1764: #endif
                   1765:        if (inp->inp_flags & INP_RECVIF) {
                   1766:                struct sockaddr_dl sdl;
                   1767:
                   1768:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1769:                sdl.sdl_family = AF_LINK;
                   1770:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1771:                    m->m_pkthdr.rcvif->if_index : 0;
                   1772:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1773:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1774:                    IP_RECVIF, IPPROTO_IP);
                   1775:                if (*mp)
                   1776:                        mp = &(*mp)->m_next;
                   1777:        }
1.13      mycroft  1778: }
                   1779:
                   1780: int
                   1781: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1782:        int *name;
                   1783:        u_int namelen;
                   1784:        void *oldp;
                   1785:        size_t *oldlenp;
                   1786:        void *newp;
                   1787:        size_t newlen;
                   1788: {
1.88      sommerfe 1789:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1790:
1.54      lukem    1791:        int error, old;
                   1792:
1.13      mycroft  1793:        /* All sysctl names at this level are terminal. */
                   1794:        if (namelen != 1)
                   1795:                return (ENOTDIR);
                   1796:
                   1797:        switch (name[0]) {
                   1798:        case IPCTL_FORWARDING:
                   1799:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1800:        case IPCTL_SENDREDIRECTS:
                   1801:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1802:                        &ipsendredirects));
                   1803:        case IPCTL_DEFTTL:
                   1804:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1805: #ifdef notyet
                   1806:        case IPCTL_DEFMTU:
                   1807:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1808: #endif
1.26      thorpej  1809:        case IPCTL_FORWSRCRT:
1.47      cjs      1810:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1811:                if (securelevel > 0)
1.46      cjs      1812:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1813:                            ip_forwsrcrt));
                   1814:                else
                   1815:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1816:                            &ip_forwsrcrt));
1.27      thorpej  1817:        case IPCTL_DIRECTEDBCAST:
                   1818:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1819:                    &ip_directedbcast));
1.47      cjs      1820:        case IPCTL_ALLOWSRCRT:
                   1821:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1822:                    &ip_allowsrcrt));
1.52      thorpej  1823:        case IPCTL_SUBNETSARELOCAL:
                   1824:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1825:                    &subnetsarelocal));
1.53      kml      1826:        case IPCTL_MTUDISC:
1.60      kml      1827:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1828:                    &ip_mtudisc);
1.163   ! itojun   1829:                if (error == 0 && ip_mtudisc == 0)
        !          1830:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1831:                return error;
1.54      lukem    1832:        case IPCTL_ANONPORTMIN:
                   1833:                old = anonportmin;
                   1834:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1835:                if (anonportmin >= anonportmax || anonportmin < 0
                   1836:                    || anonportmin > 65535
1.54      lukem    1837: #ifndef IPNOPRIVPORTS
                   1838:                    || anonportmin < IPPORT_RESERVED
                   1839: #endif
                   1840:                    ) {
                   1841:                        anonportmin = old;
                   1842:                        return (EINVAL);
                   1843:                }
                   1844:                return (error);
                   1845:        case IPCTL_ANONPORTMAX:
                   1846:                old = anonportmax;
                   1847:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1848:                if (anonportmin >= anonportmax || anonportmax < 0
                   1849:                    || anonportmax > 65535
1.54      lukem    1850: #ifndef IPNOPRIVPORTS
                   1851:                    || anonportmax < IPPORT_RESERVED
                   1852: #endif
                   1853:                    ) {
                   1854:                        anonportmax = old;
                   1855:                        return (EINVAL);
                   1856:                }
1.60      kml      1857:                return (error);
                   1858:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   1859:                old = ip_mtudisc_timeout;
1.60      kml      1860:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1861:                   &ip_mtudisc_timeout);
1.158     itojun   1862:                if (ip_mtudisc_timeout < 0) {
                   1863:                        ip_mtudisc_timeout = old;
1.156     itojun   1864:                        return (EINVAL);
1.158     itojun   1865:                }
1.163   ! itojun   1866:                if (error == 0)
1.162     itojun   1867:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1868:                                              ip_mtudisc_timeout);
1.54      lukem    1869:                return (error);
1.65      matt     1870: #ifdef GATEWAY
                   1871:        case IPCTL_MAXFLOWS:
1.67      thorpej  1872:            {
                   1873:                int s;
                   1874:
1.65      matt     1875:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1876:                   &ip_maxflows);
1.67      thorpej  1877:                s = splsoftnet();
1.65      matt     1878:                ipflow_reap(0);
1.67      thorpej  1879:                splx(s);
1.65      matt     1880:                return (error);
1.67      thorpej  1881:            }
1.89      itojun   1882: #endif
1.90      itojun   1883:        case IPCTL_HOSTZEROBROADCAST:
                   1884:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1885:                    &hostzeroisbroadcast));
1.89      itojun   1886: #if NGIF > 0
                   1887:        case IPCTL_GIF_TTL:
1.157     itojun   1888:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1889:                                  &ip_gif_ttl));
1.144     martin   1890: #endif
                   1891:
                   1892: #if NGRE > 0
                   1893:        case IPCTL_GRE_TTL:
1.157     itojun   1894:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   1895:                                  &ip_gre_ttl));
1.117     tron     1896: #endif
                   1897:
                   1898: #ifndef IPNOPRIVPORTS
                   1899:        case IPCTL_LOWPORTMIN:
                   1900:                old = lowportmin;
                   1901:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   1902:                if (lowportmin >= lowportmax
                   1903:                    || lowportmin > IPPORT_RESERVEDMAX
                   1904:                    || lowportmin < IPPORT_RESERVEDMIN
                   1905:                    ) {
                   1906:                        lowportmin = old;
                   1907:                        return (EINVAL);
                   1908:                }
                   1909:                return (error);
                   1910:        case IPCTL_LOWPORTMAX:
                   1911:                old = lowportmax;
                   1912:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   1913:                if (lowportmin >= lowportmax
                   1914:                    || lowportmax > IPPORT_RESERVEDMAX
                   1915:                    || lowportmax < IPPORT_RESERVEDMIN
                   1916:                    ) {
                   1917:                        lowportmax = old;
                   1918:                        return (EINVAL);
                   1919:                }
                   1920:                return (error);
1.65      matt     1921: #endif
1.131     itojun   1922:
                   1923:        case IPCTL_MAXFRAGPACKETS:
                   1924:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1925:                    &ip_maxfragpackets));
1.88      sommerfe 1926:
1.13      mycroft  1927:        default:
                   1928:                return (EOPNOTSUPP);
                   1929:        }
                   1930:        /* NOTREACHED */
1.1       cgd      1931: }

CVSweb <webmaster@jp.NetBSD.org>