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Annotation of src/sys/netinet/ip_input.c, Revision 1.164

1.164   ! matt        1: /*     $NetBSD: ip_input.c,v 1.163 2002/11/12 02:10:13 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>
1.164   ! matt      105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.163 2002/11/12 02:10:13 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:
1.164   ! matt      312: #ifdef MBUFTRACE
        !           313: struct mowner ip_rx_mowner = { "internet", "rx" };
        !           314: struct mowner ip_tx_mowner = { "internet", "tx" };
        !           315: #endif
        !           316:
1.1       cgd       317: /*
                    318:  * IP initialization: fill in IP protocol switch table.
                    319:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    320:  */
1.8       mycroft   321: void
1.1       cgd       322: ip_init()
                    323: {
1.109     augustss  324:        struct protosw *pr;
                    325:        int i;
1.1       cgd       326:
1.72      thorpej   327:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   328:            NULL);
1.72      thorpej   329:
1.1       cgd       330:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    331:        if (pr == 0)
                    332:                panic("ip_init");
                    333:        for (i = 0; i < IPPROTO_MAX; i++)
                    334:                ip_protox[i] = pr - inetsw;
                    335:        for (pr = inetdomain.dom_protosw;
                    336:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    337:                if (pr->pr_domain->dom_family == PF_INET &&
                    338:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    339:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       340:        LIST_INIT(&ipq);
1.1       cgd       341:        ip_id = time.tv_sec & 0xffff;
                    342:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   343:        TAILQ_INIT(&in_ifaddr);
1.120     ad        344:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    345:            M_WAITOK, &in_ifaddrhash);
1.160     itojun    346:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   347: #ifdef GATEWAY
                    348:        ipflow_init();
                    349: #endif
1.121     thorpej   350:
                    351: #ifdef PFIL_HOOKS
                    352:        /* Register our Packet Filter hook. */
1.126     thorpej   353:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    354:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   355:        i = pfil_head_register(&inet_pfil_hook);
                    356:        if (i != 0)
                    357:                printf("ip_init: WARNING: unable to register pfil hook, "
                    358:                    "error %d\n", i);
                    359: #endif /* PFIL_HOOKS */
1.135     thorpej   360:
                    361: #ifdef INET_CSUM_COUNTERS
                    362:        evcnt_attach_static(&ip_hwcsum_bad);
                    363:        evcnt_attach_static(&ip_hwcsum_ok);
                    364:        evcnt_attach_static(&ip_swcsum);
                    365: #endif /* INET_CSUM_COUNTERS */
1.164   ! matt      366:
        !           367: #ifdef MBUFTRACE
        !           368:        MOWNER_ATTACH(&ip_tx_mowner);
        !           369:        MOWNER_ATTACH(&ip_rx_mowner);
        !           370: #endif /* MBUFTRACE */
1.1       cgd       371: }
                    372:
                    373: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    374: struct route ipforward_rt;
                    375:
                    376: /*
1.89      itojun    377:  * IP software interrupt routine
                    378:  */
                    379: void
                    380: ipintr()
                    381: {
                    382:        int s;
                    383:        struct mbuf *m;
                    384:
                    385:        while (1) {
1.132     thorpej   386:                s = splnet();
1.89      itojun    387:                IF_DEQUEUE(&ipintrq, m);
                    388:                splx(s);
                    389:                if (m == 0)
                    390:                        return;
1.164   ! matt      391:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    392:                ip_input(m);
                    393:        }
                    394: }
                    395:
                    396: /*
1.1       cgd       397:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    398:  * try to reassemble.  Process options.  Pass to next level.
                    399:  */
1.8       mycroft   400: void
1.89      itojun    401: ip_input(struct mbuf *m)
1.1       cgd       402: {
1.109     augustss  403:        struct ip *ip = NULL;
                    404:        struct ipq *fp;
                    405:        struct in_ifaddr *ia;
                    406:        struct ifaddr *ifa;
1.25      cgd       407:        struct ipqent *ipqe;
1.89      itojun    408:        int hlen = 0, mff, len;
1.100     itojun    409:        int downmatch;
1.1       cgd       410:
1.164   ! matt      411:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       412: #ifdef DIAGNOSTIC
                    413:        if ((m->m_flags & M_PKTHDR) == 0)
                    414:                panic("ipintr no HDR");
                    415: #endif
1.89      itojun    416: #ifdef IPSEC
                    417:        /*
                    418:         * should the inner packet be considered authentic?
                    419:         * see comment in ah4_input().
                    420:         */
                    421:        if (m) {
                    422:                m->m_flags &= ~M_AUTHIPHDR;
                    423:                m->m_flags &= ~M_AUTHIPDGM;
                    424:        }
                    425: #endif
1.164   ! matt      426:
1.1       cgd       427:        /*
                    428:         * If no IP addresses have been set yet but the interfaces
                    429:         * are receiving, can't do anything with incoming packets yet.
                    430:         */
1.140     matt      431:        if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1       cgd       432:                goto bad;
                    433:        ipstat.ips_total++;
1.154     thorpej   434:        /*
                    435:         * If the IP header is not aligned, slurp it up into a new
                    436:         * mbuf with space for link headers, in the event we forward
                    437:         * it.  Otherwise, if it is aligned, make sure the entire
                    438:         * base IP header is in the first mbuf of the chain.
                    439:         */
                    440:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    441:                if ((m = m_copyup(m, sizeof(struct ip),
                    442:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    443:                        /* XXXJRT new stat, please */
                    444:                        ipstat.ips_toosmall++;
                    445:                        return;
                    446:                }
                    447:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    448:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    449:                        ipstat.ips_toosmall++;
                    450:                        return;
                    451:                }
1.1       cgd       452:        }
                    453:        ip = mtod(m, struct ip *);
1.13      mycroft   454:        if (ip->ip_v != IPVERSION) {
                    455:                ipstat.ips_badvers++;
                    456:                goto bad;
                    457:        }
1.1       cgd       458:        hlen = ip->ip_hl << 2;
                    459:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    460:                ipstat.ips_badhlen++;
                    461:                goto bad;
                    462:        }
                    463:        if (hlen > m->m_len) {
                    464:                if ((m = m_pullup(m, hlen)) == 0) {
                    465:                        ipstat.ips_badhlen++;
1.89      itojun    466:                        return;
1.1       cgd       467:                }
                    468:                ip = mtod(m, struct ip *);
                    469:        }
1.98      thorpej   470:
1.85      hwr       471:        /*
1.99      thorpej   472:         * RFC1122: packets with a multicast source address are
1.98      thorpej   473:         * not allowed.
1.85      hwr       474:         */
                    475:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    476:                ipstat.ips_badaddr++;
1.85      hwr       477:                goto bad;
1.129     itojun    478:        }
                    479:
                    480:        /* 127/8 must not appear on wire - RFC1122 */
                    481:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    482:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    483:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    484:                        ipstat.ips_badaddr++;
1.129     itojun    485:                        goto bad;
1.130     itojun    486:                }
1.85      hwr       487:        }
                    488:
1.135     thorpej   489:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   490:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   491:                 M_CSUM_IPv4_BAD)) {
                    492:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    493:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    494:                goto badcsum;
                    495:
                    496:        case M_CSUM_IPv4:
                    497:                /* Checksum was okay. */
                    498:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    499:                break;
                    500:
                    501:        default:
                    502:                /* Must compute it ourselves. */
                    503:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    504:                if (in_cksum(m, hlen) != 0)
                    505:                        goto bad;
                    506:                break;
1.1       cgd       507:        }
                    508:
1.121     thorpej   509:        /* Retrieve the packet length. */
                    510:        len = ntohs(ip->ip_len);
1.81      proff     511:
                    512:        /*
                    513:         * Check for additional length bogosity
                    514:         */
1.84      proff     515:        if (len < hlen) {
1.81      proff     516:                ipstat.ips_badlen++;
                    517:                goto bad;
                    518:        }
1.1       cgd       519:
                    520:        /*
                    521:         * Check that the amount of data in the buffers
                    522:         * is as at least much as the IP header would have us expect.
                    523:         * Trim mbufs if longer than we expect.
                    524:         * Drop packet if shorter than we expect.
                    525:         */
1.35      mycroft   526:        if (m->m_pkthdr.len < len) {
1.1       cgd       527:                ipstat.ips_tooshort++;
                    528:                goto bad;
                    529:        }
1.35      mycroft   530:        if (m->m_pkthdr.len > len) {
1.1       cgd       531:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   532:                        m->m_len = len;
                    533:                        m->m_pkthdr.len = len;
1.1       cgd       534:                } else
1.35      mycroft   535:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       536:        }
                    537:
1.94      itojun    538: #ifdef IPSEC
1.149     wiz       539:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    540:        m->m_flags &= ~M_CANFASTFWD;
                    541: #else
1.64      thorpej   542:        /*
                    543:         * Assume that we can create a fast-forward IP flow entry
                    544:         * based on this packet.
                    545:         */
                    546:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    547: #endif
1.64      thorpej   548:
1.36      mrg       549: #ifdef PFIL_HOOKS
1.33      mrg       550:        /*
1.64      thorpej   551:         * Run through list of hooks for input packets.  If there are any
                    552:         * filters which require that additional packets in the flow are
                    553:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    554:         * Note that filters must _never_ set this flag, as another filter
                    555:         * in the list may have previously cleared it.
1.33      mrg       556:         */
1.127     itojun    557:        /*
                    558:         * let ipfilter look at packet on the wire,
                    559:         * not the decapsulated packet.
                    560:         */
                    561: #ifdef IPSEC
1.136     itojun    562:        if (!ipsec_getnhist(m))
1.127     itojun    563: #else
                    564:        if (1)
                    565: #endif
                    566:        {
                    567:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
                    568:                                   PFIL_IN) != 0)
1.121     thorpej   569:                return;
1.127     itojun    570:                if (m == NULL)
                    571:                        return;
                    572:                ip = mtod(m, struct ip *);
1.142     darrenr   573:                hlen = ip->ip_hl << 2;
1.127     itojun    574:        }
1.36      mrg       575: #endif /* PFIL_HOOKS */
1.123     thorpej   576:
                    577: #ifdef ALTQ
                    578:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    579:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    580:                /* packet dropped by traffic conditioner */
                    581:                return;
                    582:        }
                    583: #endif
1.121     thorpej   584:
                    585:        /*
1.1       cgd       586:         * Process options and, if not destined for us,
                    587:         * ship it on.  ip_dooptions returns 1 when an
                    588:         * error was detected (causing an icmp message
                    589:         * to be sent and the original packet to be freed).
                    590:         */
                    591:        ip_nhops = 0;           /* for source routed packets */
                    592:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    593:                return;
1.1       cgd       594:
                    595:        /*
                    596:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    597:         *
                    598:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    599:         * The behavior here is to treat addresses on !IFF_UP interface
                    600:         * as not mine.
1.1       cgd       601:         */
1.100     itojun    602:        downmatch = 0;
1.140     matt      603:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    604:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    605:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    606:                                break;
1.100     itojun    607:                        else
                    608:                                downmatch++;
1.97      itojun    609:                }
                    610:        }
1.86      thorpej   611:        if (ia != NULL)
                    612:                goto ours;
1.57      tls       613:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      614:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    615:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    616:                                continue;
1.57      tls       617:                        ia = ifatoia(ifa);
1.35      mycroft   618:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    619:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   620:                            /*
                    621:                             * Look for all-0's host part (old broadcast addr),
                    622:                             * either for subnet or net.
                    623:                             */
                    624:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   625:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       626:                                goto ours;
1.57      tls       627:                        /*
                    628:                         * An interface with IP address zero accepts
                    629:                         * all packets that arrive on that interface.
                    630:                         */
                    631:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    632:                                goto ours;
1.1       cgd       633:                }
                    634:        }
1.18      mycroft   635:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   636:                struct in_multi *inm;
                    637: #ifdef MROUTING
                    638:                extern struct socket *ip_mrouter;
1.10      brezak    639:
1.147     matt      640:                if (M_READONLY(m)) {
1.10      brezak    641:                        if ((m = m_pullup(m, hlen)) == 0) {
                    642:                                ipstat.ips_toosmall++;
1.89      itojun    643:                                return;
1.10      brezak    644:                        }
                    645:                        ip = mtod(m, struct ip *);
                    646:                }
1.4       hpeyerl   647:
                    648:                if (ip_mrouter) {
                    649:                        /*
                    650:                         * If we are acting as a multicast router, all
                    651:                         * incoming multicast packets are passed to the
                    652:                         * kernel-level multicast forwarding function.
                    653:                         * The packet is returned (relatively) intact; if
                    654:                         * ip_mforward() returns a non-zero value, the packet
                    655:                         * must be discarded, else it may be accepted below.
                    656:                         *
                    657:                         * (The IP ident field is put in the same byte order
                    658:                         * as expected when ip_mforward() is called from
                    659:                         * ip_output().)
                    660:                         */
1.13      mycroft   661:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    662:                                ipstat.ips_cantforward++;
1.4       hpeyerl   663:                                m_freem(m);
1.89      itojun    664:                                return;
1.4       hpeyerl   665:                        }
                    666:
                    667:                        /*
                    668:                         * The process-level routing demon needs to receive
                    669:                         * all multicast IGMP packets, whether or not this
                    670:                         * host belongs to their destination groups.
                    671:                         */
                    672:                        if (ip->ip_p == IPPROTO_IGMP)
                    673:                                goto ours;
1.13      mycroft   674:                        ipstat.ips_forward++;
1.4       hpeyerl   675:                }
                    676: #endif
                    677:                /*
                    678:                 * See if we belong to the destination multicast group on the
                    679:                 * arrival interface.
                    680:                 */
                    681:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    682:                if (inm == NULL) {
1.13      mycroft   683:                        ipstat.ips_cantforward++;
1.4       hpeyerl   684:                        m_freem(m);
1.89      itojun    685:                        return;
1.4       hpeyerl   686:                }
                    687:                goto ours;
                    688:        }
1.19      mycroft   689:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   690:            in_nullhost(ip->ip_dst))
1.1       cgd       691:                goto ours;
                    692:
                    693:        /*
                    694:         * Not for us; forward if possible and desirable.
                    695:         */
                    696:        if (ipforwarding == 0) {
                    697:                ipstat.ips_cantforward++;
                    698:                m_freem(m);
1.100     itojun    699:        } else {
                    700:                /*
                    701:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    702:                 * and there's no IFF_UP interface that matches ip_dst,
                    703:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    704:                 * forwarding loop till TTL goes to 0.
                    705:                 */
                    706:                if (downmatch) {
                    707:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    708:                        ipstat.ips_cantforward++;
                    709:                        return;
                    710:                }
1.145     itojun    711: #ifdef IPSEC
                    712:                if (ipsec4_in_reject(m, NULL)) {
                    713:                        ipsecstat.in_polvio++;
                    714:                        goto bad;
                    715:                }
                    716: #endif
                    717:
1.1       cgd       718:                ip_forward(m, 0);
1.100     itojun    719:        }
1.89      itojun    720:        return;
1.1       cgd       721:
                    722: ours:
                    723:        /*
                    724:         * If offset or IP_MF are set, must reassemble.
                    725:         * Otherwise, nothing need be done.
                    726:         * (We could look in the reassembly queue to see
                    727:         * if the packet was previously fragmented,
                    728:         * but it's not worth the time; just let them time out.)
                    729:         */
1.155     itojun    730:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    731:                if (M_READONLY(m)) {
                    732:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    733:                                ipstat.ips_toosmall++;
                    734:                                goto bad;
                    735:                        }
                    736:                        ip = mtod(m, struct ip *);
                    737:                }
                    738:
1.1       cgd       739:                /*
                    740:                 * Look for queue of fragments
                    741:                 * of this datagram.
                    742:                 */
1.75      thorpej   743:                IPQ_LOCK();
1.140     matt      744:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       745:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   746:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    747:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       748:                            ip->ip_p == fp->ipq_p)
                    749:                                goto found;
                    750:                fp = 0;
                    751: found:
                    752:
                    753:                /*
                    754:                 * Adjust ip_len to not reflect header,
1.25      cgd       755:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       756:                 * convert offset of this to bytes.
                    757:                 */
1.155     itojun    758:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    759:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       760:                if (mff) {
1.16      cgd       761:                        /*
                    762:                         * Make sure that fragments have a data length
                    763:                         * that's a non-zero multiple of 8 bytes.
                    764:                         */
1.155     itojun    765:                        if (ntohs(ip->ip_len) == 0 ||
                    766:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       767:                                ipstat.ips_badfrags++;
1.75      thorpej   768:                                IPQ_UNLOCK();
1.16      cgd       769:                                goto bad;
                    770:                        }
                    771:                }
1.155     itojun    772:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       773:
                    774:                /*
                    775:                 * If datagram marked as having more fragments
                    776:                 * or if this is not the first fragment,
                    777:                 * attempt reassembly; if it succeeds, proceed.
                    778:                 */
1.155     itojun    779:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       780:                        ipstat.ips_fragments++;
1.72      thorpej   781:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       782:                        if (ipqe == NULL) {
                    783:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   784:                                IPQ_UNLOCK();
1.25      cgd       785:                                goto bad;
                    786:                        }
                    787:                        ipqe->ipqe_mff = mff;
1.50      thorpej   788:                        ipqe->ipqe_m = m;
1.25      cgd       789:                        ipqe->ipqe_ip = ip;
1.50      thorpej   790:                        m = ip_reass(ipqe, fp);
1.75      thorpej   791:                        if (m == 0) {
                    792:                                IPQ_UNLOCK();
1.89      itojun    793:                                return;
1.75      thorpej   794:                        }
1.13      mycroft   795:                        ipstat.ips_reassembled++;
1.50      thorpej   796:                        ip = mtod(m, struct ip *);
1.74      thorpej   797:                        hlen = ip->ip_hl << 2;
1.155     itojun    798:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       799:                } else
                    800:                        if (fp)
                    801:                                ip_freef(fp);
1.75      thorpej   802:                IPQ_UNLOCK();
1.79      mycroft   803:        }
1.128     itojun    804:
                    805: #ifdef IPSEC
                    806:        /*
                    807:         * enforce IPsec policy checking if we are seeing last header.
                    808:         * note that we do not visit this with protocols with pcb layer
                    809:         * code - like udp/tcp/raw ip.
                    810:         */
                    811:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    812:            ipsec4_in_reject(m, NULL)) {
                    813:                ipsecstat.in_polvio++;
                    814:                goto bad;
                    815:        }
                    816: #endif
1.1       cgd       817:
                    818:        /*
                    819:         * Switch out to protocol's input routine.
                    820:         */
1.82      aidan     821: #if IFA_STATS
1.122     itojun    822:        if (ia && ip)
1.155     itojun    823:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     824: #endif
1.1       cgd       825:        ipstat.ips_delivered++;
1.89      itojun    826:     {
                    827:        int off = hlen, nh = ip->ip_p;
                    828:
                    829:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    830:        return;
                    831:     }
1.1       cgd       832: bad:
                    833:        m_freem(m);
1.135     thorpej   834:        return;
                    835:
                    836: badcsum:
                    837:        ipstat.ips_badsum++;
                    838:        m_freem(m);
1.1       cgd       839: }
                    840:
                    841: /*
                    842:  * Take incoming datagram fragment and try to
                    843:  * reassemble it into whole datagram.  If a chain for
                    844:  * reassembly of this datagram already exists, then it
                    845:  * is given as fp; otherwise have to make a chain.
                    846:  */
1.50      thorpej   847: struct mbuf *
1.25      cgd       848: ip_reass(ipqe, fp)
1.109     augustss  849:        struct ipqent *ipqe;
                    850:        struct ipq *fp;
1.1       cgd       851: {
1.109     augustss  852:        struct mbuf *m = ipqe->ipqe_m;
                    853:        struct ipqent *nq, *p, *q;
1.25      cgd       854:        struct ip *ip;
1.1       cgd       855:        struct mbuf *t;
1.25      cgd       856:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       857:        int i, next;
                    858:
1.75      thorpej   859:        IPQ_LOCK_CHECK();
                    860:
1.1       cgd       861:        /*
                    862:         * Presence of header sizes in mbufs
                    863:         * would confuse code below.
                    864:         */
                    865:        m->m_data += hlen;
                    866:        m->m_len -= hlen;
                    867:
                    868:        /*
                    869:         * If first fragment to arrive, create a reassembly queue.
                    870:         */
                    871:        if (fp == 0) {
1.131     itojun    872:                /*
                    873:                 * Enforce upper bound on number of fragmented packets
                    874:                 * for which we attempt reassembly;
                    875:                 * If maxfrag is 0, never accept fragments.
                    876:                 * If maxfrag is -1, accept all fragments without limitation.
                    877:                 */
                    878:                if (ip_maxfragpackets < 0)
                    879:                        ;
                    880:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    881:                        goto dropfrag;
                    882:                ip_nfragpackets++;
1.50      thorpej   883:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    884:                    M_FTABLE, M_NOWAIT);
                    885:                if (fp == NULL)
1.1       cgd       886:                        goto dropfrag;
1.25      cgd       887:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       888:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       889:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    890:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt      891:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd       892:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    893:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    894:                p = NULL;
1.1       cgd       895:                goto insert;
                    896:        }
                    897:
                    898:        /*
                    899:         * Find a segment which begins after this one does.
                    900:         */
1.148     matt      901:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    902:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun    903:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd       904:                        break;
                    905:
                    906:        /*
                    907:         * If there is a preceding segment, it may provide some of
                    908:         * our data already.  If so, drop the data from the incoming
                    909:         * segment.  If it provides all of our data, drop us.
                    910:         */
1.25      cgd       911:        if (p != NULL) {
1.155     itojun    912:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                    913:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd       914:                if (i > 0) {
1.155     itojun    915:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd       916:                                goto dropfrag;
1.50      thorpej   917:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun    918:                        ipqe->ipqe_ip->ip_off =
                    919:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                    920:                        ipqe->ipqe_ip->ip_len =
                    921:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd       922:                }
                    923:        }
                    924:
                    925:        /*
                    926:         * While we overlap succeeding segments trim them or,
                    927:         * if they are completely covered, dequeue them.
                    928:         */
1.155     itojun    929:        for (; q != NULL &&
                    930:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                    931:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                    932:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                    933:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                    934:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                    935:                        q->ipqe_ip->ip_len =
                    936:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                    937:                        q->ipqe_ip->ip_off =
                    938:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej   939:                        m_adj(q->ipqe_m, i);
1.1       cgd       940:                        break;
                    941:                }
1.148     matt      942:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej   943:                m_freem(q->ipqe_m);
1.148     matt      944:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej   945:                pool_put(&ipqent_pool, q);
1.1       cgd       946:        }
                    947:
                    948: insert:
                    949:        /*
                    950:         * Stick new segment in its place;
                    951:         * check for complete reassembly.
                    952:         */
1.25      cgd       953:        if (p == NULL) {
1.148     matt      954:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd       955:        } else {
1.148     matt      956:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd       957:        }
1.1       cgd       958:        next = 0;
1.148     matt      959:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    960:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun    961:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd       962:                        return (0);
1.155     itojun    963:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd       964:        }
1.25      cgd       965:        if (p->ipqe_mff)
1.1       cgd       966:                return (0);
                    967:
                    968:        /*
1.41      thorpej   969:         * Reassembly is complete.  Check for a bogus message size and
                    970:         * concatenate fragments.
1.1       cgd       971:         */
1.148     matt      972:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd       973:        ip = q->ipqe_ip;
1.41      thorpej   974:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    975:                ipstat.ips_toolong++;
                    976:                ip_freef(fp);
                    977:                return (0);
                    978:        }
1.50      thorpej   979:        m = q->ipqe_m;
1.1       cgd       980:        t = m->m_next;
                    981:        m->m_next = 0;
                    982:        m_cat(m, t);
1.148     matt      983:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   984:        pool_put(&ipqent_pool, q);
1.25      cgd       985:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   986:                t = q->ipqe_m;
1.148     matt      987:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   988:                pool_put(&ipqent_pool, q);
1.1       cgd       989:                m_cat(m, t);
                    990:        }
                    991:
                    992:        /*
                    993:         * Create header for new ip packet by
                    994:         * modifying header of first packet;
                    995:         * dequeue and discard fragment reassembly header.
                    996:         * Make header visible.
                    997:         */
1.155     itojun    998:        ip->ip_len = htons(next);
1.25      cgd       999:        ip->ip_src = fp->ipq_src;
                   1000:        ip->ip_dst = fp->ipq_dst;
                   1001:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1002:        FREE(fp, M_FTABLE);
1.131     itojun   1003:        ip_nfragpackets--;
1.1       cgd      1004:        m->m_len += (ip->ip_hl << 2);
                   1005:        m->m_data -= (ip->ip_hl << 2);
                   1006:        /* some debugging cruft by sklower, below, will go away soon */
                   1007:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1008:                int plen = 0;
1.50      thorpej  1009:                for (t = m; t; t = t->m_next)
                   1010:                        plen += t->m_len;
                   1011:                m->m_pkthdr.len = plen;
1.1       cgd      1012:        }
1.50      thorpej  1013:        return (m);
1.1       cgd      1014:
                   1015: dropfrag:
                   1016:        ipstat.ips_fragdropped++;
                   1017:        m_freem(m);
1.72      thorpej  1018:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1019:        return (0);
                   1020: }
                   1021:
                   1022: /*
                   1023:  * Free a fragment reassembly header and all
                   1024:  * associated datagrams.
                   1025:  */
1.8       mycroft  1026: void
1.1       cgd      1027: ip_freef(fp)
                   1028:        struct ipq *fp;
                   1029: {
1.109     augustss 1030:        struct ipqent *q, *p;
1.1       cgd      1031:
1.75      thorpej  1032:        IPQ_LOCK_CHECK();
                   1033:
1.148     matt     1034:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1035:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1036:                m_freem(q->ipqe_m);
1.148     matt     1037:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1038:                pool_put(&ipqent_pool, q);
1.1       cgd      1039:        }
1.25      cgd      1040:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1041:        FREE(fp, M_FTABLE);
1.131     itojun   1042:        ip_nfragpackets--;
1.1       cgd      1043: }
                   1044:
                   1045: /*
                   1046:  * IP timer processing;
                   1047:  * if a timer expires on a reassembly
                   1048:  * queue, discard it.
                   1049:  */
1.8       mycroft  1050: void
1.1       cgd      1051: ip_slowtimo()
                   1052: {
1.109     augustss 1053:        struct ipq *fp, *nfp;
1.24      mycroft  1054:        int s = splsoftnet();
1.1       cgd      1055:
1.75      thorpej  1056:        IPQ_LOCK();
1.140     matt     1057:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1058:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1059:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1060:                        ipstat.ips_fragtimeout++;
1.25      cgd      1061:                        ip_freef(fp);
1.1       cgd      1062:                }
                   1063:        }
1.131     itojun   1064:        /*
                   1065:         * If we are over the maximum number of fragments
                   1066:         * (due to the limit being lowered), drain off
                   1067:         * enough to get down to the new limit.
                   1068:         */
                   1069:        if (ip_maxfragpackets < 0)
                   1070:                ;
                   1071:        else {
1.140     matt     1072:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1073:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1074:        }
1.75      thorpej  1075:        IPQ_UNLOCK();
1.63      matt     1076: #ifdef GATEWAY
                   1077:        ipflow_slowtimo();
                   1078: #endif
1.1       cgd      1079:        splx(s);
                   1080: }
                   1081:
                   1082: /*
                   1083:  * Drain off all datagram fragments.
                   1084:  */
1.8       mycroft  1085: void
1.1       cgd      1086: ip_drain()
                   1087: {
                   1088:
1.75      thorpej  1089:        /*
                   1090:         * We may be called from a device's interrupt context.  If
                   1091:         * the ipq is already busy, just bail out now.
                   1092:         */
                   1093:        if (ipq_lock_try() == 0)
                   1094:                return;
                   1095:
1.140     matt     1096:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1097:                ipstat.ips_fragdropped++;
1.140     matt     1098:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1099:        }
1.75      thorpej  1100:
                   1101:        IPQ_UNLOCK();
1.1       cgd      1102: }
                   1103:
                   1104: /*
                   1105:  * Do option processing on a datagram,
                   1106:  * possibly discarding it if bad options are encountered,
                   1107:  * or forwarding it if source-routed.
                   1108:  * Returns 1 if packet has been forwarded/freed,
                   1109:  * 0 if the packet should be processed further.
                   1110:  */
1.8       mycroft  1111: int
1.1       cgd      1112: ip_dooptions(m)
                   1113:        struct mbuf *m;
                   1114: {
1.109     augustss 1115:        struct ip *ip = mtod(m, struct ip *);
                   1116:        u_char *cp, *cp0;
                   1117:        struct ip_timestamp *ipt;
                   1118:        struct in_ifaddr *ia;
1.1       cgd      1119:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1120:        struct in_addr dst;
1.1       cgd      1121:        n_time ntime;
                   1122:
1.13      mycroft  1123:        dst = ip->ip_dst;
1.1       cgd      1124:        cp = (u_char *)(ip + 1);
                   1125:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1126:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1127:                opt = cp[IPOPT_OPTVAL];
                   1128:                if (opt == IPOPT_EOL)
                   1129:                        break;
                   1130:                if (opt == IPOPT_NOP)
                   1131:                        optlen = 1;
                   1132:                else {
1.113     itojun   1133:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1134:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1135:                                goto bad;
                   1136:                        }
1.1       cgd      1137:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1138:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1139:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1140:                                goto bad;
                   1141:                        }
                   1142:                }
                   1143:                switch (opt) {
                   1144:
                   1145:                default:
                   1146:                        break;
                   1147:
                   1148:                /*
                   1149:                 * Source routing with record.
                   1150:                 * Find interface with current destination address.
                   1151:                 * If none on this machine then drop if strictly routed,
                   1152:                 * or do nothing if loosely routed.
                   1153:                 * Record interface address and bring up next address
                   1154:                 * component.  If strictly routed make sure next
                   1155:                 * address is on directly accessible net.
                   1156:                 */
                   1157:                case IPOPT_LSRR:
                   1158:                case IPOPT_SSRR:
1.47      cjs      1159:                        if (ip_allowsrcrt == 0) {
                   1160:                                type = ICMP_UNREACH;
                   1161:                                code = ICMP_UNREACH_NET_PROHIB;
                   1162:                                goto bad;
                   1163:                        }
1.114     itojun   1164:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1165:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1166:                                goto bad;
                   1167:                        }
1.1       cgd      1168:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1169:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1170:                                goto bad;
                   1171:                        }
                   1172:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1173:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1174:                        if (ia == 0) {
                   1175:                                if (opt == IPOPT_SSRR) {
                   1176:                                        type = ICMP_UNREACH;
                   1177:                                        code = ICMP_UNREACH_SRCFAIL;
                   1178:                                        goto bad;
                   1179:                                }
                   1180:                                /*
                   1181:                                 * Loose routing, and not at next destination
                   1182:                                 * yet; nothing to do except forward.
                   1183:                                 */
                   1184:                                break;
                   1185:                        }
                   1186:                        off--;                  /* 0 origin */
1.112     sommerfe 1187:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1188:                                /*
                   1189:                                 * End of source route.  Should be for us.
                   1190:                                 */
                   1191:                                save_rte(cp, ip->ip_src);
                   1192:                                break;
                   1193:                        }
                   1194:                        /*
                   1195:                         * locate outgoing interface
                   1196:                         */
                   1197:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1198:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1199:                        if (opt == IPOPT_SSRR)
                   1200:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1201:                        else
1.1       cgd      1202:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1203:                        if (ia == 0) {
                   1204:                                type = ICMP_UNREACH;
                   1205:                                code = ICMP_UNREACH_SRCFAIL;
                   1206:                                goto bad;
                   1207:                        }
                   1208:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1209:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1210:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1211:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1212:                        /*
                   1213:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1214:                         */
1.18      mycroft  1215:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1216:                        break;
                   1217:
                   1218:                case IPOPT_RR:
1.114     itojun   1219:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1220:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1221:                                goto bad;
                   1222:                        }
1.1       cgd      1223:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1224:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1225:                                goto bad;
                   1226:                        }
                   1227:                        /*
                   1228:                         * If no space remains, ignore.
                   1229:                         */
                   1230:                        off--;                  /* 0 origin */
1.112     sommerfe 1231:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1232:                                break;
                   1233:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1234:                            sizeof(ipaddr.sin_addr));
                   1235:                        /*
                   1236:                         * locate outgoing interface; if we're the destination,
                   1237:                         * use the incoming interface (should be same).
                   1238:                         */
1.96      thorpej  1239:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1240:                            == NULL &&
                   1241:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1242:                                type = ICMP_UNREACH;
                   1243:                                code = ICMP_UNREACH_HOST;
                   1244:                                goto bad;
                   1245:                        }
1.20      mycroft  1246:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1247:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1248:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1249:                        break;
                   1250:
                   1251:                case IPOPT_TS:
                   1252:                        code = cp - (u_char *)ip;
                   1253:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1254:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1255:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1256:                                goto bad;
1.114     itojun   1257:                        }
                   1258:                        if (ipt->ipt_ptr < 5) {
                   1259:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1260:                                goto bad;
                   1261:                        }
1.15      cgd      1262:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1263:                                if (++ipt->ipt_oflw == 0) {
                   1264:                                        code = (u_char *)&ipt->ipt_ptr -
                   1265:                                            (u_char *)ip;
1.1       cgd      1266:                                        goto bad;
1.114     itojun   1267:                                }
1.1       cgd      1268:                                break;
                   1269:                        }
1.104     thorpej  1270:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1271:                        switch (ipt->ipt_flg) {
                   1272:
                   1273:                        case IPOPT_TS_TSONLY:
                   1274:                                break;
                   1275:
                   1276:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1277:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1278:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1279:                                        code = (u_char *)&ipt->ipt_ptr -
                   1280:                                            (u_char *)ip;
1.1       cgd      1281:                                        goto bad;
1.114     itojun   1282:                                }
1.13      mycroft  1283:                                ipaddr.sin_addr = dst;
1.96      thorpej  1284:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1285:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1286:                                if (ia == 0)
                   1287:                                        continue;
1.104     thorpej  1288:                                bcopy(&ia->ia_addr.sin_addr,
                   1289:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1290:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1291:                                break;
                   1292:
                   1293:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1294:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1295:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1296:                                        code = (u_char *)&ipt->ipt_ptr -
                   1297:                                            (u_char *)ip;
1.1       cgd      1298:                                        goto bad;
1.114     itojun   1299:                                }
1.104     thorpej  1300:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1301:                                    sizeof(struct in_addr));
1.96      thorpej  1302:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1303:                                    == NULL)
1.1       cgd      1304:                                        continue;
                   1305:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1306:                                break;
                   1307:
                   1308:                        default:
1.114     itojun   1309:                                /* XXX can't take &ipt->ipt_flg */
                   1310:                                code = (u_char *)&ipt->ipt_ptr -
                   1311:                                    (u_char *)ip + 1;
1.1       cgd      1312:                                goto bad;
                   1313:                        }
                   1314:                        ntime = iptime();
1.107     thorpej  1315:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1316:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1317:                            sizeof(n_time));
                   1318:                        ipt->ipt_ptr += sizeof(n_time);
                   1319:                }
                   1320:        }
                   1321:        if (forward) {
1.26      thorpej  1322:                if (ip_forwsrcrt == 0) {
                   1323:                        type = ICMP_UNREACH;
                   1324:                        code = ICMP_UNREACH_SRCFAIL;
                   1325:                        goto bad;
                   1326:                }
1.1       cgd      1327:                ip_forward(m, 1);
                   1328:                return (1);
1.13      mycroft  1329:        }
                   1330:        return (0);
1.1       cgd      1331: bad:
1.13      mycroft  1332:        icmp_error(m, type, code, 0, 0);
                   1333:        ipstat.ips_badoptions++;
1.1       cgd      1334:        return (1);
                   1335: }
                   1336:
                   1337: /*
                   1338:  * Given address of next destination (final or next hop),
                   1339:  * return internet address info of interface to be used to get there.
                   1340:  */
                   1341: struct in_ifaddr *
                   1342: ip_rtaddr(dst)
                   1343:         struct in_addr dst;
                   1344: {
1.109     augustss 1345:        struct sockaddr_in *sin;
1.1       cgd      1346:
1.19      mycroft  1347:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1348:
1.35      mycroft  1349:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1350:                if (ipforward_rt.ro_rt) {
                   1351:                        RTFREE(ipforward_rt.ro_rt);
                   1352:                        ipforward_rt.ro_rt = 0;
                   1353:                }
                   1354:                sin->sin_family = AF_INET;
                   1355:                sin->sin_len = sizeof(*sin);
                   1356:                sin->sin_addr = dst;
                   1357:
                   1358:                rtalloc(&ipforward_rt);
                   1359:        }
                   1360:        if (ipforward_rt.ro_rt == 0)
                   1361:                return ((struct in_ifaddr *)0);
1.19      mycroft  1362:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1363: }
                   1364:
                   1365: /*
                   1366:  * Save incoming source route for use in replies,
                   1367:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1368:  */
1.13      mycroft  1369: void
1.1       cgd      1370: save_rte(option, dst)
                   1371:        u_char *option;
                   1372:        struct in_addr dst;
                   1373: {
                   1374:        unsigned olen;
                   1375:
                   1376:        olen = option[IPOPT_OLEN];
                   1377: #ifdef DIAGNOSTIC
                   1378:        if (ipprintfs)
1.39      christos 1379:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1380: #endif /* 0 */
1.1       cgd      1381:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1382:                return;
                   1383:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1384:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1385:        ip_srcrt.dst = dst;
                   1386: }
                   1387:
                   1388: /*
                   1389:  * Retrieve incoming source route for use in replies,
                   1390:  * in the same form used by setsockopt.
                   1391:  * The first hop is placed before the options, will be removed later.
                   1392:  */
                   1393: struct mbuf *
                   1394: ip_srcroute()
                   1395: {
1.109     augustss 1396:        struct in_addr *p, *q;
                   1397:        struct mbuf *m;
1.1       cgd      1398:
                   1399:        if (ip_nhops == 0)
                   1400:                return ((struct mbuf *)0);
                   1401:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1402:        if (m == 0)
                   1403:                return ((struct mbuf *)0);
                   1404:
1.164   ! matt     1405:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1406: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1407:
                   1408:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1409:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1410:            OPTSIZ;
                   1411: #ifdef DIAGNOSTIC
                   1412:        if (ipprintfs)
1.39      christos 1413:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1414: #endif
                   1415:
                   1416:        /*
                   1417:         * First save first hop for return route
                   1418:         */
                   1419:        p = &ip_srcrt.route[ip_nhops - 1];
                   1420:        *(mtod(m, struct in_addr *)) = *p--;
                   1421: #ifdef DIAGNOSTIC
                   1422:        if (ipprintfs)
1.39      christos 1423:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1424: #endif
                   1425:
                   1426:        /*
                   1427:         * Copy option fields and padding (nop) to mbuf.
                   1428:         */
                   1429:        ip_srcrt.nop = IPOPT_NOP;
                   1430:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1431:        bcopy((caddr_t)&ip_srcrt.nop,
                   1432:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1433:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1434:            sizeof(struct in_addr) + OPTSIZ);
                   1435: #undef OPTSIZ
                   1436:        /*
                   1437:         * Record return path as an IP source route,
                   1438:         * reversing the path (pointers are now aligned).
                   1439:         */
                   1440:        while (p >= ip_srcrt.route) {
                   1441: #ifdef DIAGNOSTIC
                   1442:                if (ipprintfs)
1.39      christos 1443:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1444: #endif
                   1445:                *q++ = *p--;
                   1446:        }
                   1447:        /*
                   1448:         * Last hop goes to final destination.
                   1449:         */
                   1450:        *q = ip_srcrt.dst;
                   1451: #ifdef DIAGNOSTIC
                   1452:        if (ipprintfs)
1.39      christos 1453:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1454: #endif
                   1455:        return (m);
                   1456: }
                   1457:
                   1458: /*
                   1459:  * Strip out IP options, at higher
                   1460:  * level protocol in the kernel.
                   1461:  * Second argument is buffer to which options
                   1462:  * will be moved, and return value is their length.
                   1463:  * XXX should be deleted; last arg currently ignored.
                   1464:  */
1.8       mycroft  1465: void
1.1       cgd      1466: ip_stripoptions(m, mopt)
1.109     augustss 1467:        struct mbuf *m;
1.1       cgd      1468:        struct mbuf *mopt;
                   1469: {
1.109     augustss 1470:        int i;
1.1       cgd      1471:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1472:        caddr_t opts;
1.1       cgd      1473:        int olen;
                   1474:
1.79      mycroft  1475:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1476:        opts = (caddr_t)(ip + 1);
                   1477:        i = m->m_len - (sizeof (struct ip) + olen);
                   1478:        bcopy(opts  + olen, opts, (unsigned)i);
                   1479:        m->m_len -= olen;
                   1480:        if (m->m_flags & M_PKTHDR)
                   1481:                m->m_pkthdr.len -= olen;
1.155     itojun   1482:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1483:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1484: }
                   1485:
1.139     matt     1486: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1487:        0,              0,              0,              0,
                   1488:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1489:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1490:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1491:        0,              0,              0,              0,
                   1492:        ENOPROTOOPT
                   1493: };
                   1494:
                   1495: /*
                   1496:  * Forward a packet.  If some error occurs return the sender
                   1497:  * an icmp packet.  Note we can't always generate a meaningful
                   1498:  * icmp message because icmp doesn't have a large enough repertoire
                   1499:  * of codes and types.
                   1500:  *
                   1501:  * If not forwarding, just drop the packet.  This could be confusing
                   1502:  * if ipforwarding was zero but some routing protocol was advancing
                   1503:  * us as a gateway to somewhere.  However, we must let the routing
                   1504:  * protocol deal with that.
                   1505:  *
                   1506:  * The srcrt parameter indicates whether the packet is being forwarded
                   1507:  * via a source route.
                   1508:  */
1.13      mycroft  1509: void
1.1       cgd      1510: ip_forward(m, srcrt)
                   1511:        struct mbuf *m;
                   1512:        int srcrt;
                   1513: {
1.109     augustss 1514:        struct ip *ip = mtod(m, struct ip *);
                   1515:        struct sockaddr_in *sin;
                   1516:        struct rtentry *rt;
1.28      christos 1517:        int error, type = 0, code = 0;
1.1       cgd      1518:        struct mbuf *mcopy;
1.13      mycroft  1519:        n_long dest;
                   1520:        struct ifnet *destifp;
1.89      itojun   1521: #ifdef IPSEC
                   1522:        struct ifnet dummyifp;
                   1523: #endif
1.164   ! matt     1524:
        !          1525:        /*
        !          1526:         * We are now in the output path.
        !          1527:         */
        !          1528:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1529:
                   1530:        /*
                   1531:         * Clear any in-bound checksum flags for this packet.
                   1532:         */
                   1533:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1534:
1.13      mycroft  1535:        dest = 0;
1.1       cgd      1536: #ifdef DIAGNOSTIC
                   1537:        if (ipprintfs)
1.70      thorpej  1538:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1539:                    ntohl(ip->ip_src.s_addr),
                   1540:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1541: #endif
1.93      sommerfe 1542:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1543:                ipstat.ips_cantforward++;
                   1544:                m_freem(m);
                   1545:                return;
                   1546:        }
                   1547:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1548:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1549:                return;
                   1550:        }
                   1551:        ip->ip_ttl -= IPTTLDEC;
                   1552:
1.19      mycroft  1553:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1554:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1555:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1556:                if (ipforward_rt.ro_rt) {
                   1557:                        RTFREE(ipforward_rt.ro_rt);
                   1558:                        ipforward_rt.ro_rt = 0;
                   1559:                }
                   1560:                sin->sin_family = AF_INET;
1.35      mycroft  1561:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1562:                sin->sin_addr = ip->ip_dst;
                   1563:
                   1564:                rtalloc(&ipforward_rt);
                   1565:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1566:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1567:                        return;
                   1568:                }
                   1569:                rt = ipforward_rt.ro_rt;
                   1570:        }
                   1571:
                   1572:        /*
1.34      mycroft  1573:         * Save at most 68 bytes of the packet in case
1.1       cgd      1574:         * we need to generate an ICMP message to the src.
1.119     itojun   1575:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1576:         */
1.155     itojun   1577:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1578:        if (mcopy)
                   1579:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1580:
                   1581:        /*
                   1582:         * If forwarding packet using same interface that it came in on,
                   1583:         * perhaps should send a redirect to sender to shortcut a hop.
                   1584:         * Only send redirect if source is sending directly to us,
                   1585:         * and if packet was not source routed (or has any options).
                   1586:         * Also, don't send redirect if forwarding using a default route
                   1587:         * or a route modified by a redirect.
                   1588:         */
                   1589:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1590:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1591:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1592:            ipsendredirects && !srcrt) {
1.19      mycroft  1593:                if (rt->rt_ifa &&
                   1594:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1595:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1596:                        if (rt->rt_flags & RTF_GATEWAY)
                   1597:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1598:                        else
                   1599:                                dest = ip->ip_dst.s_addr;
                   1600:                        /*
                   1601:                         * Router requirements says to only send host
                   1602:                         * redirects.
                   1603:                         */
                   1604:                        type = ICMP_REDIRECT;
                   1605:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1606: #ifdef DIAGNOSTIC
1.77      thorpej  1607:                        if (ipprintfs)
                   1608:                                printf("redirect (%d) to %x\n", code,
                   1609:                                    (u_int32_t)dest);
1.1       cgd      1610: #endif
                   1611:                }
                   1612:        }
                   1613:
1.89      itojun   1614: #ifdef IPSEC
1.134     lukem    1615:        /* Don't lookup socket in forwarding case */
1.127     itojun   1616:        (void)ipsec_setsocket(m, NULL);
1.103     itojun   1617: #endif
1.27      thorpej  1618:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1619:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1620:        if (error)
                   1621:                ipstat.ips_cantforward++;
                   1622:        else {
                   1623:                ipstat.ips_forward++;
                   1624:                if (type)
                   1625:                        ipstat.ips_redirectsent++;
                   1626:                else {
1.63      matt     1627:                        if (mcopy) {
                   1628: #ifdef GATEWAY
1.64      thorpej  1629:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1630:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1631: #endif
1.1       cgd      1632:                                m_freem(mcopy);
1.63      matt     1633:                        }
1.1       cgd      1634:                        return;
                   1635:                }
                   1636:        }
                   1637:        if (mcopy == NULL)
                   1638:                return;
1.13      mycroft  1639:        destifp = NULL;
                   1640:
1.1       cgd      1641:        switch (error) {
                   1642:
                   1643:        case 0:                         /* forwarded, but need redirect */
                   1644:                /* type, code set above */
                   1645:                break;
                   1646:
                   1647:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1648:        case EHOSTUNREACH:
                   1649:        case ENETDOWN:
                   1650:        case EHOSTDOWN:
                   1651:        default:
                   1652:                type = ICMP_UNREACH;
                   1653:                code = ICMP_UNREACH_HOST;
                   1654:                break;
                   1655:
                   1656:        case EMSGSIZE:
                   1657:                type = ICMP_UNREACH;
                   1658:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1659: #ifndef IPSEC
1.13      mycroft  1660:                if (ipforward_rt.ro_rt)
                   1661:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1662: #else
                   1663:                /*
                   1664:                 * If the packet is routed over IPsec tunnel, tell the
                   1665:                 * originator the tunnel MTU.
                   1666:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1667:                 * XXX quickhack!!!
                   1668:                 */
                   1669:                if (ipforward_rt.ro_rt) {
                   1670:                        struct secpolicy *sp;
                   1671:                        int ipsecerror;
1.95      itojun   1672:                        size_t ipsechdr;
1.89      itojun   1673:                        struct route *ro;
                   1674:
                   1675:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.95      itojun   1676:                                                    IPSEC_DIR_OUTBOUND,
                   1677:                                                    IP_FORWARDING,
                   1678:                                                    &ipsecerror);
1.89      itojun   1679:
                   1680:                        if (sp == NULL)
                   1681:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1682:                        else {
                   1683:                                /* count IPsec header size */
1.95      itojun   1684:                                ipsechdr = ipsec4_hdrsiz(mcopy,
                   1685:                                                         IPSEC_DIR_OUTBOUND,
                   1686:                                                         NULL);
1.89      itojun   1687:
                   1688:                                /*
                   1689:                                 * find the correct route for outer IPv4
                   1690:                                 * header, compute tunnel MTU.
                   1691:                                 *
                   1692:                                 * XXX BUG ALERT
                   1693:                                 * The "dummyifp" code relies upon the fact
                   1694:                                 * that icmp_error() touches only ifp->if_mtu.
                   1695:                                 */
                   1696:                                /*XXX*/
                   1697:                                destifp = NULL;
                   1698:                                if (sp->req != NULL
1.95      itojun   1699:                                 && sp->req->sav != NULL
                   1700:                                 && sp->req->sav->sah != NULL) {
                   1701:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1702:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1703:                                                dummyifp.if_mtu =
1.151     itojun   1704:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1705:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1706:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1707:                                                dummyifp.if_mtu -= ipsechdr;
                   1708:                                                destifp = &dummyifp;
                   1709:                                        }
                   1710:                                }
                   1711:
                   1712:                                key_freesp(sp);
                   1713:                        }
                   1714:                }
                   1715: #endif /*IPSEC*/
1.1       cgd      1716:                ipstat.ips_cantfrag++;
                   1717:                break;
                   1718:
                   1719:        case ENOBUFS:
1.143     itojun   1720: #if 1
                   1721:                /*
                   1722:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1723:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1724:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1725:                 * or if the underlying interface is rate-limited.
1.143     itojun   1726:                 */
                   1727:                if (mcopy)
                   1728:                        m_freem(mcopy);
                   1729:                return;
                   1730: #else
1.1       cgd      1731:                type = ICMP_SOURCEQUENCH;
                   1732:                code = 0;
                   1733:                break;
1.143     itojun   1734: #endif
1.1       cgd      1735:        }
1.13      mycroft  1736:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1737: }
                   1738:
                   1739: void
                   1740: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1741:        struct inpcb *inp;
                   1742:        struct mbuf **mp;
                   1743:        struct ip *ip;
                   1744:        struct mbuf *m;
1.44      thorpej  1745: {
                   1746:
                   1747:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1748:                struct timeval tv;
                   1749:
                   1750:                microtime(&tv);
                   1751:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1752:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1753:                if (*mp)
                   1754:                        mp = &(*mp)->m_next;
                   1755:        }
                   1756:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1757:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1758:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1759:                if (*mp)
                   1760:                        mp = &(*mp)->m_next;
                   1761:        }
                   1762: #ifdef notyet
                   1763:        /*
                   1764:         * XXX
                   1765:         * Moving these out of udp_input() made them even more broken
                   1766:         * than they already were.
                   1767:         *      - fenner@parc.xerox.com
                   1768:         */
                   1769:        /* options were tossed already */
                   1770:        if (inp->inp_flags & INP_RECVOPTS) {
                   1771:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1772:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1773:                if (*mp)
                   1774:                        mp = &(*mp)->m_next;
                   1775:        }
                   1776:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1777:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1778:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1779:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1780:                if (*mp)
                   1781:                        mp = &(*mp)->m_next;
                   1782:        }
                   1783: #endif
                   1784:        if (inp->inp_flags & INP_RECVIF) {
                   1785:                struct sockaddr_dl sdl;
                   1786:
                   1787:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1788:                sdl.sdl_family = AF_LINK;
                   1789:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1790:                    m->m_pkthdr.rcvif->if_index : 0;
                   1791:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1792:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1793:                    IP_RECVIF, IPPROTO_IP);
                   1794:                if (*mp)
                   1795:                        mp = &(*mp)->m_next;
                   1796:        }
1.13      mycroft  1797: }
                   1798:
                   1799: int
                   1800: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1801:        int *name;
                   1802:        u_int namelen;
                   1803:        void *oldp;
                   1804:        size_t *oldlenp;
                   1805:        void *newp;
                   1806:        size_t newlen;
                   1807: {
1.88      sommerfe 1808:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1809:
1.54      lukem    1810:        int error, old;
                   1811:
1.13      mycroft  1812:        /* All sysctl names at this level are terminal. */
                   1813:        if (namelen != 1)
                   1814:                return (ENOTDIR);
                   1815:
                   1816:        switch (name[0]) {
                   1817:        case IPCTL_FORWARDING:
                   1818:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1819:        case IPCTL_SENDREDIRECTS:
                   1820:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1821:                        &ipsendredirects));
                   1822:        case IPCTL_DEFTTL:
                   1823:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1824: #ifdef notyet
                   1825:        case IPCTL_DEFMTU:
                   1826:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1827: #endif
1.26      thorpej  1828:        case IPCTL_FORWSRCRT:
1.47      cjs      1829:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1830:                if (securelevel > 0)
1.46      cjs      1831:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1832:                            ip_forwsrcrt));
                   1833:                else
                   1834:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1835:                            &ip_forwsrcrt));
1.27      thorpej  1836:        case IPCTL_DIRECTEDBCAST:
                   1837:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1838:                    &ip_directedbcast));
1.47      cjs      1839:        case IPCTL_ALLOWSRCRT:
                   1840:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1841:                    &ip_allowsrcrt));
1.52      thorpej  1842:        case IPCTL_SUBNETSARELOCAL:
                   1843:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1844:                    &subnetsarelocal));
1.53      kml      1845:        case IPCTL_MTUDISC:
1.60      kml      1846:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1847:                    &ip_mtudisc);
1.163     itojun   1848:                if (error == 0 && ip_mtudisc == 0)
                   1849:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1850:                return error;
1.54      lukem    1851:        case IPCTL_ANONPORTMIN:
                   1852:                old = anonportmin;
                   1853:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1854:                if (anonportmin >= anonportmax || anonportmin < 0
                   1855:                    || anonportmin > 65535
1.54      lukem    1856: #ifndef IPNOPRIVPORTS
                   1857:                    || anonportmin < IPPORT_RESERVED
                   1858: #endif
                   1859:                    ) {
                   1860:                        anonportmin = old;
                   1861:                        return (EINVAL);
                   1862:                }
                   1863:                return (error);
                   1864:        case IPCTL_ANONPORTMAX:
                   1865:                old = anonportmax;
                   1866:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1867:                if (anonportmin >= anonportmax || anonportmax < 0
                   1868:                    || anonportmax > 65535
1.54      lukem    1869: #ifndef IPNOPRIVPORTS
                   1870:                    || anonportmax < IPPORT_RESERVED
                   1871: #endif
                   1872:                    ) {
                   1873:                        anonportmax = old;
                   1874:                        return (EINVAL);
                   1875:                }
1.60      kml      1876:                return (error);
                   1877:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   1878:                old = ip_mtudisc_timeout;
1.60      kml      1879:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1880:                   &ip_mtudisc_timeout);
1.158     itojun   1881:                if (ip_mtudisc_timeout < 0) {
                   1882:                        ip_mtudisc_timeout = old;
1.156     itojun   1883:                        return (EINVAL);
1.158     itojun   1884:                }
1.163     itojun   1885:                if (error == 0)
1.162     itojun   1886:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1887:                                              ip_mtudisc_timeout);
1.54      lukem    1888:                return (error);
1.65      matt     1889: #ifdef GATEWAY
                   1890:        case IPCTL_MAXFLOWS:
1.67      thorpej  1891:            {
                   1892:                int s;
                   1893:
1.65      matt     1894:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1895:                   &ip_maxflows);
1.67      thorpej  1896:                s = splsoftnet();
1.65      matt     1897:                ipflow_reap(0);
1.67      thorpej  1898:                splx(s);
1.65      matt     1899:                return (error);
1.67      thorpej  1900:            }
1.89      itojun   1901: #endif
1.90      itojun   1902:        case IPCTL_HOSTZEROBROADCAST:
                   1903:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1904:                    &hostzeroisbroadcast));
1.89      itojun   1905: #if NGIF > 0
                   1906:        case IPCTL_GIF_TTL:
1.157     itojun   1907:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1908:                                  &ip_gif_ttl));
1.144     martin   1909: #endif
                   1910:
                   1911: #if NGRE > 0
                   1912:        case IPCTL_GRE_TTL:
1.157     itojun   1913:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   1914:                                  &ip_gre_ttl));
1.117     tron     1915: #endif
                   1916:
                   1917: #ifndef IPNOPRIVPORTS
                   1918:        case IPCTL_LOWPORTMIN:
                   1919:                old = lowportmin;
                   1920:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   1921:                if (lowportmin >= lowportmax
                   1922:                    || lowportmin > IPPORT_RESERVEDMAX
                   1923:                    || lowportmin < IPPORT_RESERVEDMIN
                   1924:                    ) {
                   1925:                        lowportmin = old;
                   1926:                        return (EINVAL);
                   1927:                }
                   1928:                return (error);
                   1929:        case IPCTL_LOWPORTMAX:
                   1930:                old = lowportmax;
                   1931:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   1932:                if (lowportmin >= lowportmax
                   1933:                    || lowportmax > IPPORT_RESERVEDMAX
                   1934:                    || lowportmax < IPPORT_RESERVEDMIN
                   1935:                    ) {
                   1936:                        lowportmax = old;
                   1937:                        return (EINVAL);
                   1938:                }
                   1939:                return (error);
1.65      matt     1940: #endif
1.131     itojun   1941:
                   1942:        case IPCTL_MAXFRAGPACKETS:
                   1943:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1944:                    &ip_maxfragpackets));
1.88      sommerfe 1945:
1.13      mycroft  1946:        default:
                   1947:                return (EOPNOTSUPP);
                   1948:        }
                   1949:        /* NOTREACHED */
1.1       cgd      1950: }

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