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Annotation of src/sys/netinet/ip_input.c, Revision 1.130.2.12

1.130.2.11  nathanw     1: /*     $NetBSD$        */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.130.2.10  nathanw     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.
1.130.2.10  nathanw    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:  */
1.55      scottr    103:
1.130.2.5  nathanw   104: #include <sys/cdefs.h>
1.130.2.11  nathanw   105: __KERNEL_RCSID(0, "$NetBSD$");
1.130.2.5  nathanw   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"
1.130.2.2  nathanw   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"
1.130.2.7  nathanw   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
1.130.2.10  nathanw   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;
1.60      kml       195: u_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;
1.130.2.10  nathanw   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;
1.130.2.1  nathanw   218: int    ip_nfragpackets = 0;
1.130.2.2  nathanw   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:
1.130.2.2  nathanw   229:        /*
1.130.2.10  nathanw   230:         * Use splvm() -- we're blocking things that would cause
1.130.2.2  nathanw   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:
1.130.2.2  nathanw   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:        }                                                               \
                    260: } while (0)
                    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:        }                                                               \
                    267: } while (0)
                    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:
1.130.2.2  nathanw   277: #ifdef INET_CSUM_COUNTERS
                    278: #include <sys/device.h>
                    279:
                    280: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    281:     NULL, "inet", "hwcsum bad");
                    282: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    283:     NULL, "inet", "hwcsum ok");
                    284: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    285:     NULL, "inet", "swcsum");
                    286:
                    287: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    288:
                    289: #else
                    290:
                    291: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    292:
                    293: #endif /* INET_CSUM_COUNTERS */
                    294:
1.1       cgd       295: /*
                    296:  * We need to save the IP options in case a protocol wants to respond
                    297:  * to an incoming packet over the same route if the packet got here
                    298:  * using IP source routing.  This allows connection establishment and
                    299:  * maintenance when the remote end is on a network that is not known
                    300:  * to us.
                    301:  */
                    302: int    ip_nhops = 0;
                    303: static struct ip_srcrt {
                    304:        struct  in_addr dst;                    /* final destination */
                    305:        char    nop;                            /* one NOP to align */
                    306:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    307:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    308: } ip_srcrt;
                    309:
1.13      mycroft   310: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   311:
1.1       cgd       312: /*
                    313:  * IP initialization: fill in IP protocol switch table.
                    314:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    315:  */
1.8       mycroft   316: void
1.1       cgd       317: ip_init()
                    318: {
1.109     augustss  319:        struct protosw *pr;
                    320:        int i;
1.1       cgd       321:
1.72      thorpej   322:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.130.2.8  nathanw   323:            NULL);
1.72      thorpej   324:
1.1       cgd       325:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    326:        if (pr == 0)
                    327:                panic("ip_init");
                    328:        for (i = 0; i < IPPROTO_MAX; i++)
                    329:                ip_protox[i] = pr - inetsw;
                    330:        for (pr = inetdomain.dom_protosw;
                    331:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    332:                if (pr->pr_domain->dom_family == PF_INET &&
                    333:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    334:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       335:        LIST_INIT(&ipq);
1.1       cgd       336:        ip_id = time.tv_sec & 0xffff;
                    337:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   338:        TAILQ_INIT(&in_ifaddr);
1.120     ad        339:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    340:            M_WAITOK, &in_ifaddrhash);
1.60      kml       341:        if (ip_mtudisc != 0)
1.130.2.10  nathanw   342:                ip_mtudisc_timeout_q =
1.60      kml       343:                    rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   344: #ifdef GATEWAY
                    345:        ipflow_init();
                    346: #endif
1.121     thorpej   347:
                    348: #ifdef PFIL_HOOKS
                    349:        /* Register our Packet Filter hook. */
1.126     thorpej   350:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    351:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   352:        i = pfil_head_register(&inet_pfil_hook);
                    353:        if (i != 0)
                    354:                printf("ip_init: WARNING: unable to register pfil hook, "
                    355:                    "error %d\n", i);
                    356: #endif /* PFIL_HOOKS */
1.130.2.2  nathanw   357:
                    358: #ifdef INET_CSUM_COUNTERS
                    359:        evcnt_attach_static(&ip_hwcsum_bad);
                    360:        evcnt_attach_static(&ip_hwcsum_ok);
                    361:        evcnt_attach_static(&ip_swcsum);
                    362: #endif /* INET_CSUM_COUNTERS */
1.1       cgd       363: }
                    364:
                    365: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    366: struct route ipforward_rt;
                    367:
                    368: /*
1.89      itojun    369:  * IP software interrupt routine
                    370:  */
                    371: void
                    372: ipintr()
                    373: {
                    374:        int s;
                    375:        struct mbuf *m;
                    376:
                    377:        while (1) {
1.130.2.2  nathanw   378:                s = splnet();
1.89      itojun    379:                IF_DEQUEUE(&ipintrq, m);
                    380:                splx(s);
                    381:                if (m == 0)
                    382:                        return;
                    383:                ip_input(m);
                    384:        }
                    385: }
                    386:
                    387: /*
1.1       cgd       388:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    389:  * try to reassemble.  Process options.  Pass to next level.
                    390:  */
1.8       mycroft   391: void
1.89      itojun    392: ip_input(struct mbuf *m)
1.1       cgd       393: {
1.109     augustss  394:        struct ip *ip = NULL;
                    395:        struct ipq *fp;
                    396:        struct in_ifaddr *ia;
                    397:        struct ifaddr *ifa;
1.25      cgd       398:        struct ipqent *ipqe;
1.89      itojun    399:        int hlen = 0, mff, len;
1.100     itojun    400:        int downmatch;
1.1       cgd       401:
                    402: #ifdef DIAGNOSTIC
                    403:        if ((m->m_flags & M_PKTHDR) == 0)
                    404:                panic("ipintr no HDR");
                    405: #endif
1.89      itojun    406: #ifdef IPSEC
                    407:        /*
                    408:         * should the inner packet be considered authentic?
                    409:         * see comment in ah4_input().
                    410:         */
                    411:        if (m) {
                    412:                m->m_flags &= ~M_AUTHIPHDR;
                    413:                m->m_flags &= ~M_AUTHIPDGM;
                    414:        }
                    415: #endif
1.1       cgd       416:        /*
                    417:         * If no IP addresses have been set yet but the interfaces
                    418:         * are receiving, can't do anything with incoming packets yet.
                    419:         */
1.130.2.5  nathanw   420:        if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1       cgd       421:                goto bad;
                    422:        ipstat.ips_total++;
1.130.2.11  nathanw   423:        /*
                    424:         * If the IP header is not aligned, slurp it up into a new
                    425:         * mbuf with space for link headers, in the event we forward
                    426:         * it.  Otherwise, if it is aligned, make sure the entire
                    427:         * base IP header is in the first mbuf of the chain.
                    428:         */
                    429:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    430:                if ((m = m_copyup(m, sizeof(struct ip),
                    431:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    432:                        /* XXXJRT new stat, please */
                    433:                        ipstat.ips_toosmall++;
                    434:                        return;
                    435:                }
                    436:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    437:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    438:                        ipstat.ips_toosmall++;
                    439:                        return;
                    440:                }
1.1       cgd       441:        }
                    442:        ip = mtod(m, struct ip *);
1.13      mycroft   443:        if (ip->ip_v != IPVERSION) {
                    444:                ipstat.ips_badvers++;
                    445:                goto bad;
                    446:        }
1.1       cgd       447:        hlen = ip->ip_hl << 2;
                    448:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    449:                ipstat.ips_badhlen++;
                    450:                goto bad;
                    451:        }
                    452:        if (hlen > m->m_len) {
                    453:                if ((m = m_pullup(m, hlen)) == 0) {
                    454:                        ipstat.ips_badhlen++;
1.89      itojun    455:                        return;
1.1       cgd       456:                }
                    457:                ip = mtod(m, struct ip *);
                    458:        }
1.98      thorpej   459:
1.85      hwr       460:        /*
1.99      thorpej   461:         * RFC1122: packets with a multicast source address are
1.98      thorpej   462:         * not allowed.
1.85      hwr       463:         */
                    464:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    465:                ipstat.ips_badaddr++;
1.85      hwr       466:                goto bad;
1.129     itojun    467:        }
                    468:
                    469:        /* 127/8 must not appear on wire - RFC1122 */
                    470:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    471:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    472:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    473:                        ipstat.ips_badaddr++;
1.129     itojun    474:                        goto bad;
1.130     itojun    475:                }
1.85      hwr       476:        }
                    477:
1.130.2.2  nathanw   478:        switch (m->m_pkthdr.csum_flags &
1.130.2.4  nathanw   479:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.130.2.2  nathanw   480:                 M_CSUM_IPv4_BAD)) {
                    481:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    482:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    483:                goto badcsum;
                    484:
                    485:        case M_CSUM_IPv4:
                    486:                /* Checksum was okay. */
                    487:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    488:                break;
                    489:
                    490:        default:
                    491:                /* Must compute it ourselves. */
                    492:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    493:                if (in_cksum(m, hlen) != 0)
                    494:                        goto bad;
                    495:                break;
1.1       cgd       496:        }
                    497:
1.121     thorpej   498:        /* Retrieve the packet length. */
                    499:        len = ntohs(ip->ip_len);
1.81      proff     500:
                    501:        /*
                    502:         * Check for additional length bogosity
                    503:         */
1.84      proff     504:        if (len < hlen) {
1.81      proff     505:                ipstat.ips_badlen++;
                    506:                goto bad;
                    507:        }
1.1       cgd       508:
                    509:        /*
                    510:         * Check that the amount of data in the buffers
                    511:         * is as at least much as the IP header would have us expect.
                    512:         * Trim mbufs if longer than we expect.
                    513:         * Drop packet if shorter than we expect.
                    514:         */
1.35      mycroft   515:        if (m->m_pkthdr.len < len) {
1.1       cgd       516:                ipstat.ips_tooshort++;
                    517:                goto bad;
                    518:        }
1.35      mycroft   519:        if (m->m_pkthdr.len > len) {
1.1       cgd       520:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   521:                        m->m_len = len;
                    522:                        m->m_pkthdr.len = len;
1.1       cgd       523:                } else
1.35      mycroft   524:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       525:        }
                    526:
1.94      itojun    527: #ifdef IPSEC
1.130.2.10  nathanw   528:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    529:        m->m_flags &= ~M_CANFASTFWD;
                    530: #else
1.64      thorpej   531:        /*
                    532:         * Assume that we can create a fast-forward IP flow entry
                    533:         * based on this packet.
                    534:         */
                    535:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    536: #endif
1.64      thorpej   537:
1.36      mrg       538: #ifdef PFIL_HOOKS
1.33      mrg       539:        /*
1.64      thorpej   540:         * Run through list of hooks for input packets.  If there are any
                    541:         * filters which require that additional packets in the flow are
                    542:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    543:         * Note that filters must _never_ set this flag, as another filter
                    544:         * in the list may have previously cleared it.
1.33      mrg       545:         */
1.127     itojun    546:        /*
                    547:         * let ipfilter look at packet on the wire,
                    548:         * not the decapsulated packet.
                    549:         */
                    550: #ifdef IPSEC
1.130.2.3  nathanw   551:        if (!ipsec_getnhist(m))
1.127     itojun    552: #else
                    553:        if (1)
                    554: #endif
                    555:        {
                    556:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
                    557:                                   PFIL_IN) != 0)
1.121     thorpej   558:                return;
1.127     itojun    559:                if (m == NULL)
                    560:                        return;
                    561:                ip = mtod(m, struct ip *);
1.130.2.6  nathanw   562:                hlen = ip->ip_hl << 2;
1.127     itojun    563:        }
1.36      mrg       564: #endif /* PFIL_HOOKS */
1.123     thorpej   565:
                    566: #ifdef ALTQ
                    567:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    568:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    569:                /* packet dropped by traffic conditioner */
                    570:                return;
                    571:        }
                    572: #endif
1.121     thorpej   573:
                    574:        /*
1.1       cgd       575:         * Process options and, if not destined for us,
                    576:         * ship it on.  ip_dooptions returns 1 when an
                    577:         * error was detected (causing an icmp message
                    578:         * to be sent and the original packet to be freed).
                    579:         */
                    580:        ip_nhops = 0;           /* for source routed packets */
                    581:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    582:                return;
1.1       cgd       583:
                    584:        /*
                    585:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    586:         *
                    587:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    588:         * The behavior here is to treat addresses on !IFF_UP interface
                    589:         * as not mine.
1.1       cgd       590:         */
1.100     itojun    591:        downmatch = 0;
1.130.2.5  nathanw   592:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    593:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    594:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    595:                                break;
1.100     itojun    596:                        else
                    597:                                downmatch++;
1.97      itojun    598:                }
                    599:        }
1.86      thorpej   600:        if (ia != NULL)
                    601:                goto ours;
1.57      tls       602:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.130.2.5  nathanw   603:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    604:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    605:                                continue;
1.57      tls       606:                        ia = ifatoia(ifa);
1.35      mycroft   607:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    608:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   609:                            /*
                    610:                             * Look for all-0's host part (old broadcast addr),
                    611:                             * either for subnet or net.
                    612:                             */
                    613:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   614:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       615:                                goto ours;
1.57      tls       616:                        /*
                    617:                         * An interface with IP address zero accepts
                    618:                         * all packets that arrive on that interface.
                    619:                         */
                    620:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    621:                                goto ours;
1.1       cgd       622:                }
                    623:        }
1.18      mycroft   624:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   625:                struct in_multi *inm;
                    626: #ifdef MROUTING
                    627:                extern struct socket *ip_mrouter;
1.10      brezak    628:
1.130.2.9  thorpej   629:                if (M_READONLY(m)) {
1.10      brezak    630:                        if ((m = m_pullup(m, hlen)) == 0) {
                    631:                                ipstat.ips_toosmall++;
1.89      itojun    632:                                return;
1.10      brezak    633:                        }
                    634:                        ip = mtod(m, struct ip *);
                    635:                }
1.4       hpeyerl   636:
                    637:                if (ip_mrouter) {
                    638:                        /*
                    639:                         * If we are acting as a multicast router, all
                    640:                         * incoming multicast packets are passed to the
                    641:                         * kernel-level multicast forwarding function.
                    642:                         * The packet is returned (relatively) intact; if
                    643:                         * ip_mforward() returns a non-zero value, the packet
                    644:                         * must be discarded, else it may be accepted below.
                    645:                         *
                    646:                         * (The IP ident field is put in the same byte order
                    647:                         * as expected when ip_mforward() is called from
                    648:                         * ip_output().)
                    649:                         */
1.13      mycroft   650:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    651:                                ipstat.ips_cantforward++;
1.4       hpeyerl   652:                                m_freem(m);
1.89      itojun    653:                                return;
1.4       hpeyerl   654:                        }
                    655:
                    656:                        /*
                    657:                         * The process-level routing demon needs to receive
                    658:                         * all multicast IGMP packets, whether or not this
                    659:                         * host belongs to their destination groups.
                    660:                         */
                    661:                        if (ip->ip_p == IPPROTO_IGMP)
                    662:                                goto ours;
1.13      mycroft   663:                        ipstat.ips_forward++;
1.4       hpeyerl   664:                }
                    665: #endif
                    666:                /*
                    667:                 * See if we belong to the destination multicast group on the
                    668:                 * arrival interface.
                    669:                 */
                    670:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    671:                if (inm == NULL) {
1.13      mycroft   672:                        ipstat.ips_cantforward++;
1.4       hpeyerl   673:                        m_freem(m);
1.89      itojun    674:                        return;
1.4       hpeyerl   675:                }
                    676:                goto ours;
                    677:        }
1.19      mycroft   678:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   679:            in_nullhost(ip->ip_dst))
1.1       cgd       680:                goto ours;
                    681:
                    682:        /*
                    683:         * Not for us; forward if possible and desirable.
                    684:         */
                    685:        if (ipforwarding == 0) {
                    686:                ipstat.ips_cantforward++;
                    687:                m_freem(m);
1.100     itojun    688:        } else {
                    689:                /*
                    690:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    691:                 * and there's no IFF_UP interface that matches ip_dst,
                    692:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    693:                 * forwarding loop till TTL goes to 0.
                    694:                 */
                    695:                if (downmatch) {
                    696:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    697:                        ipstat.ips_cantforward++;
                    698:                        return;
                    699:                }
1.130.2.7  nathanw   700: #ifdef IPSEC
                    701:                if (ipsec4_in_reject(m, NULL)) {
                    702:                        ipsecstat.in_polvio++;
                    703:                        goto bad;
                    704:                }
                    705: #endif
                    706:
1.1       cgd       707:                ip_forward(m, 0);
1.100     itojun    708:        }
1.89      itojun    709:        return;
1.1       cgd       710:
                    711: ours:
                    712:        /*
                    713:         * If offset or IP_MF are set, must reassemble.
                    714:         * Otherwise, nothing need be done.
                    715:         * (We could look in the reassembly queue to see
                    716:         * if the packet was previously fragmented,
                    717:         * but it's not worth the time; just let them time out.)
                    718:         */
1.130.2.12! nathanw   719:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
        !           720:                if (M_READONLY(m)) {
        !           721:                        if ((m = m_pullup(m, hlen)) == NULL) {
        !           722:                                ipstat.ips_toosmall++;
        !           723:                                goto bad;
        !           724:                        }
        !           725:                        ip = mtod(m, struct ip *);
        !           726:                }
        !           727:
1.1       cgd       728:                /*
                    729:                 * Look for queue of fragments
                    730:                 * of this datagram.
                    731:                 */
1.75      thorpej   732:                IPQ_LOCK();
1.130.2.5  nathanw   733:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       734:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   735:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    736:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       737:                            ip->ip_p == fp->ipq_p)
                    738:                                goto found;
                    739:                fp = 0;
                    740: found:
                    741:
                    742:                /*
                    743:                 * Adjust ip_len to not reflect header,
1.25      cgd       744:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       745:                 * convert offset of this to bytes.
                    746:                 */
1.130.2.12! nathanw   747:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
        !           748:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       749:                if (mff) {
1.16      cgd       750:                        /*
                    751:                         * Make sure that fragments have a data length
                    752:                         * that's a non-zero multiple of 8 bytes.
                    753:                         */
1.130.2.12! nathanw   754:                        if (ntohs(ip->ip_len) == 0 ||
        !           755:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       756:                                ipstat.ips_badfrags++;
1.75      thorpej   757:                                IPQ_UNLOCK();
1.16      cgd       758:                                goto bad;
                    759:                        }
                    760:                }
1.130.2.12! nathanw   761:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       762:
                    763:                /*
                    764:                 * If datagram marked as having more fragments
                    765:                 * or if this is not the first fragment,
                    766:                 * attempt reassembly; if it succeeds, proceed.
                    767:                 */
1.130.2.12! nathanw   768:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       769:                        ipstat.ips_fragments++;
1.72      thorpej   770:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       771:                        if (ipqe == NULL) {
                    772:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   773:                                IPQ_UNLOCK();
1.25      cgd       774:                                goto bad;
                    775:                        }
                    776:                        ipqe->ipqe_mff = mff;
1.50      thorpej   777:                        ipqe->ipqe_m = m;
1.25      cgd       778:                        ipqe->ipqe_ip = ip;
1.50      thorpej   779:                        m = ip_reass(ipqe, fp);
1.75      thorpej   780:                        if (m == 0) {
                    781:                                IPQ_UNLOCK();
1.89      itojun    782:                                return;
1.75      thorpej   783:                        }
1.13      mycroft   784:                        ipstat.ips_reassembled++;
1.50      thorpej   785:                        ip = mtod(m, struct ip *);
1.74      thorpej   786:                        hlen = ip->ip_hl << 2;
1.130.2.12! nathanw   787:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       788:                } else
                    789:                        if (fp)
                    790:                                ip_freef(fp);
1.75      thorpej   791:                IPQ_UNLOCK();
1.79      mycroft   792:        }
1.128     itojun    793:
                    794: #ifdef IPSEC
                    795:        /*
                    796:         * enforce IPsec policy checking if we are seeing last header.
                    797:         * note that we do not visit this with protocols with pcb layer
                    798:         * code - like udp/tcp/raw ip.
                    799:         */
                    800:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    801:            ipsec4_in_reject(m, NULL)) {
                    802:                ipsecstat.in_polvio++;
                    803:                goto bad;
                    804:        }
                    805: #endif
1.1       cgd       806:
                    807:        /*
                    808:         * Switch out to protocol's input routine.
                    809:         */
1.82      aidan     810: #if IFA_STATS
1.122     itojun    811:        if (ia && ip)
1.130.2.12! nathanw   812:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     813: #endif
1.1       cgd       814:        ipstat.ips_delivered++;
1.89      itojun    815:     {
                    816:        int off = hlen, nh = ip->ip_p;
                    817:
                    818:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    819:        return;
                    820:     }
1.1       cgd       821: bad:
                    822:        m_freem(m);
1.130.2.2  nathanw   823:        return;
                    824:
                    825: badcsum:
                    826:        ipstat.ips_badsum++;
                    827:        m_freem(m);
1.1       cgd       828: }
                    829:
                    830: /*
                    831:  * Take incoming datagram fragment and try to
                    832:  * reassemble it into whole datagram.  If a chain for
                    833:  * reassembly of this datagram already exists, then it
                    834:  * is given as fp; otherwise have to make a chain.
                    835:  */
1.50      thorpej   836: struct mbuf *
1.25      cgd       837: ip_reass(ipqe, fp)
1.109     augustss  838:        struct ipqent *ipqe;
                    839:        struct ipq *fp;
1.1       cgd       840: {
1.109     augustss  841:        struct mbuf *m = ipqe->ipqe_m;
                    842:        struct ipqent *nq, *p, *q;
1.25      cgd       843:        struct ip *ip;
1.1       cgd       844:        struct mbuf *t;
1.25      cgd       845:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       846:        int i, next;
                    847:
1.75      thorpej   848:        IPQ_LOCK_CHECK();
                    849:
1.1       cgd       850:        /*
                    851:         * Presence of header sizes in mbufs
                    852:         * would confuse code below.
                    853:         */
                    854:        m->m_data += hlen;
                    855:        m->m_len -= hlen;
                    856:
                    857:        /*
                    858:         * If first fragment to arrive, create a reassembly queue.
                    859:         */
                    860:        if (fp == 0) {
1.130.2.1  nathanw   861:                /*
                    862:                 * Enforce upper bound on number of fragmented packets
                    863:                 * for which we attempt reassembly;
                    864:                 * If maxfrag is 0, never accept fragments.
                    865:                 * If maxfrag is -1, accept all fragments without limitation.
                    866:                 */
                    867:                if (ip_maxfragpackets < 0)
                    868:                        ;
                    869:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    870:                        goto dropfrag;
                    871:                ip_nfragpackets++;
1.50      thorpej   872:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    873:                    M_FTABLE, M_NOWAIT);
                    874:                if (fp == NULL)
1.1       cgd       875:                        goto dropfrag;
1.25      cgd       876:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       877:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       878:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    879:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.130.2.10  nathanw   880:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd       881:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    882:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    883:                p = NULL;
1.1       cgd       884:                goto insert;
                    885:        }
                    886:
                    887:        /*
                    888:         * Find a segment which begins after this one does.
                    889:         */
1.130.2.10  nathanw   890:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    891:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.130.2.12! nathanw   892:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd       893:                        break;
                    894:
                    895:        /*
                    896:         * If there is a preceding segment, it may provide some of
                    897:         * our data already.  If so, drop the data from the incoming
                    898:         * segment.  If it provides all of our data, drop us.
                    899:         */
1.25      cgd       900:        if (p != NULL) {
1.130.2.12! nathanw   901:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
        !           902:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd       903:                if (i > 0) {
1.130.2.12! nathanw   904:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd       905:                                goto dropfrag;
1.50      thorpej   906:                        m_adj(ipqe->ipqe_m, i);
1.130.2.12! nathanw   907:                        ipqe->ipqe_ip->ip_off =
        !           908:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
        !           909:                        ipqe->ipqe_ip->ip_len =
        !           910:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd       911:                }
                    912:        }
                    913:
                    914:        /*
                    915:         * While we overlap succeeding segments trim them or,
                    916:         * if they are completely covered, dequeue them.
                    917:         */
1.130.2.12! nathanw   918:        for (; q != NULL &&
        !           919:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
        !           920:            ntohs(q->ipqe_ip->ip_off); q = nq) {
        !           921:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
        !           922:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
        !           923:                if (i < ntohs(q->ipqe_ip->ip_len)) {
        !           924:                        q->ipqe_ip->ip_len =
        !           925:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
        !           926:                        q->ipqe_ip->ip_off =
        !           927:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej   928:                        m_adj(q->ipqe_m, i);
1.1       cgd       929:                        break;
                    930:                }
1.130.2.10  nathanw   931:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej   932:                m_freem(q->ipqe_m);
1.130.2.10  nathanw   933:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej   934:                pool_put(&ipqent_pool, q);
1.1       cgd       935:        }
                    936:
                    937: insert:
                    938:        /*
                    939:         * Stick new segment in its place;
                    940:         * check for complete reassembly.
                    941:         */
1.25      cgd       942:        if (p == NULL) {
1.130.2.10  nathanw   943:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd       944:        } else {
1.130.2.10  nathanw   945:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd       946:        }
1.1       cgd       947:        next = 0;
1.130.2.10  nathanw   948:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    949:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.130.2.12! nathanw   950:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd       951:                        return (0);
1.130.2.12! nathanw   952:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd       953:        }
1.25      cgd       954:        if (p->ipqe_mff)
1.1       cgd       955:                return (0);
                    956:
                    957:        /*
1.41      thorpej   958:         * Reassembly is complete.  Check for a bogus message size and
                    959:         * concatenate fragments.
1.1       cgd       960:         */
1.130.2.10  nathanw   961:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd       962:        ip = q->ipqe_ip;
1.41      thorpej   963:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                    964:                ipstat.ips_toolong++;
                    965:                ip_freef(fp);
                    966:                return (0);
                    967:        }
1.50      thorpej   968:        m = q->ipqe_m;
1.1       cgd       969:        t = m->m_next;
                    970:        m->m_next = 0;
                    971:        m_cat(m, t);
1.130.2.10  nathanw   972:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   973:        pool_put(&ipqent_pool, q);
1.25      cgd       974:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej   975:                t = q->ipqe_m;
1.130.2.10  nathanw   976:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej   977:                pool_put(&ipqent_pool, q);
1.1       cgd       978:                m_cat(m, t);
                    979:        }
                    980:
                    981:        /*
                    982:         * Create header for new ip packet by
                    983:         * modifying header of first packet;
                    984:         * dequeue and discard fragment reassembly header.
                    985:         * Make header visible.
                    986:         */
1.130.2.12! nathanw   987:        ip->ip_len = htons(next);
1.25      cgd       988:        ip->ip_src = fp->ipq_src;
                    989:        ip->ip_dst = fp->ipq_dst;
                    990:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej   991:        FREE(fp, M_FTABLE);
1.130.2.1  nathanw   992:        ip_nfragpackets--;
1.1       cgd       993:        m->m_len += (ip->ip_hl << 2);
                    994:        m->m_data -= (ip->ip_hl << 2);
                    995:        /* some debugging cruft by sklower, below, will go away soon */
                    996:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss  997:                int plen = 0;
1.50      thorpej   998:                for (t = m; t; t = t->m_next)
                    999:                        plen += t->m_len;
                   1000:                m->m_pkthdr.len = plen;
1.1       cgd      1001:        }
1.50      thorpej  1002:        return (m);
1.1       cgd      1003:
                   1004: dropfrag:
                   1005:        ipstat.ips_fragdropped++;
                   1006:        m_freem(m);
1.72      thorpej  1007:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1008:        return (0);
                   1009: }
                   1010:
                   1011: /*
                   1012:  * Free a fragment reassembly header and all
                   1013:  * associated datagrams.
                   1014:  */
1.8       mycroft  1015: void
1.1       cgd      1016: ip_freef(fp)
                   1017:        struct ipq *fp;
                   1018: {
1.109     augustss 1019:        struct ipqent *q, *p;
1.1       cgd      1020:
1.75      thorpej  1021:        IPQ_LOCK_CHECK();
                   1022:
1.130.2.10  nathanw  1023:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1024:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1025:                m_freem(q->ipqe_m);
1.130.2.10  nathanw  1026:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1027:                pool_put(&ipqent_pool, q);
1.1       cgd      1028:        }
1.25      cgd      1029:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1030:        FREE(fp, M_FTABLE);
1.130.2.1  nathanw  1031:        ip_nfragpackets--;
1.1       cgd      1032: }
                   1033:
                   1034: /*
                   1035:  * IP timer processing;
                   1036:  * if a timer expires on a reassembly
                   1037:  * queue, discard it.
                   1038:  */
1.8       mycroft  1039: void
1.1       cgd      1040: ip_slowtimo()
                   1041: {
1.109     augustss 1042:        struct ipq *fp, *nfp;
1.24      mycroft  1043:        int s = splsoftnet();
1.1       cgd      1044:
1.75      thorpej  1045:        IPQ_LOCK();
1.130.2.5  nathanw  1046:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1047:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1048:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1049:                        ipstat.ips_fragtimeout++;
1.25      cgd      1050:                        ip_freef(fp);
1.1       cgd      1051:                }
                   1052:        }
1.130.2.1  nathanw  1053:        /*
                   1054:         * If we are over the maximum number of fragments
                   1055:         * (due to the limit being lowered), drain off
                   1056:         * enough to get down to the new limit.
                   1057:         */
                   1058:        if (ip_maxfragpackets < 0)
                   1059:                ;
                   1060:        else {
1.130.2.5  nathanw  1061:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1062:                        ip_freef(LIST_FIRST(&ipq));
1.130.2.1  nathanw  1063:        }
1.75      thorpej  1064:        IPQ_UNLOCK();
1.63      matt     1065: #ifdef GATEWAY
                   1066:        ipflow_slowtimo();
                   1067: #endif
1.1       cgd      1068:        splx(s);
                   1069: }
                   1070:
                   1071: /*
                   1072:  * Drain off all datagram fragments.
                   1073:  */
1.8       mycroft  1074: void
1.1       cgd      1075: ip_drain()
                   1076: {
                   1077:
1.75      thorpej  1078:        /*
                   1079:         * We may be called from a device's interrupt context.  If
                   1080:         * the ipq is already busy, just bail out now.
                   1081:         */
                   1082:        if (ipq_lock_try() == 0)
                   1083:                return;
                   1084:
1.130.2.5  nathanw  1085:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1086:                ipstat.ips_fragdropped++;
1.130.2.5  nathanw  1087:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1088:        }
1.75      thorpej  1089:
                   1090:        IPQ_UNLOCK();
1.1       cgd      1091: }
                   1092:
                   1093: /*
                   1094:  * Do option processing on a datagram,
                   1095:  * possibly discarding it if bad options are encountered,
                   1096:  * or forwarding it if source-routed.
                   1097:  * Returns 1 if packet has been forwarded/freed,
                   1098:  * 0 if the packet should be processed further.
                   1099:  */
1.8       mycroft  1100: int
1.1       cgd      1101: ip_dooptions(m)
                   1102:        struct mbuf *m;
                   1103: {
1.109     augustss 1104:        struct ip *ip = mtod(m, struct ip *);
                   1105:        u_char *cp, *cp0;
                   1106:        struct ip_timestamp *ipt;
                   1107:        struct in_ifaddr *ia;
1.1       cgd      1108:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1109:        struct in_addr dst;
1.1       cgd      1110:        n_time ntime;
                   1111:
1.13      mycroft  1112:        dst = ip->ip_dst;
1.1       cgd      1113:        cp = (u_char *)(ip + 1);
                   1114:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1115:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1116:                opt = cp[IPOPT_OPTVAL];
                   1117:                if (opt == IPOPT_EOL)
                   1118:                        break;
                   1119:                if (opt == IPOPT_NOP)
                   1120:                        optlen = 1;
                   1121:                else {
1.113     itojun   1122:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1123:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1124:                                goto bad;
                   1125:                        }
1.1       cgd      1126:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1127:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1128:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1129:                                goto bad;
                   1130:                        }
                   1131:                }
                   1132:                switch (opt) {
                   1133:
                   1134:                default:
                   1135:                        break;
                   1136:
                   1137:                /*
                   1138:                 * Source routing with record.
                   1139:                 * Find interface with current destination address.
                   1140:                 * If none on this machine then drop if strictly routed,
                   1141:                 * or do nothing if loosely routed.
                   1142:                 * Record interface address and bring up next address
                   1143:                 * component.  If strictly routed make sure next
                   1144:                 * address is on directly accessible net.
                   1145:                 */
                   1146:                case IPOPT_LSRR:
                   1147:                case IPOPT_SSRR:
1.47      cjs      1148:                        if (ip_allowsrcrt == 0) {
                   1149:                                type = ICMP_UNREACH;
                   1150:                                code = ICMP_UNREACH_NET_PROHIB;
                   1151:                                goto bad;
                   1152:                        }
1.114     itojun   1153:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1154:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1155:                                goto bad;
                   1156:                        }
1.1       cgd      1157:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1158:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1159:                                goto bad;
                   1160:                        }
                   1161:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1162:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1163:                        if (ia == 0) {
                   1164:                                if (opt == IPOPT_SSRR) {
                   1165:                                        type = ICMP_UNREACH;
                   1166:                                        code = ICMP_UNREACH_SRCFAIL;
                   1167:                                        goto bad;
                   1168:                                }
                   1169:                                /*
                   1170:                                 * Loose routing, and not at next destination
                   1171:                                 * yet; nothing to do except forward.
                   1172:                                 */
                   1173:                                break;
                   1174:                        }
                   1175:                        off--;                  /* 0 origin */
1.112     sommerfe 1176:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1177:                                /*
                   1178:                                 * End of source route.  Should be for us.
                   1179:                                 */
                   1180:                                save_rte(cp, ip->ip_src);
                   1181:                                break;
                   1182:                        }
                   1183:                        /*
                   1184:                         * locate outgoing interface
                   1185:                         */
                   1186:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1187:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1188:                        if (opt == IPOPT_SSRR)
                   1189:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1190:                        else
1.1       cgd      1191:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1192:                        if (ia == 0) {
                   1193:                                type = ICMP_UNREACH;
                   1194:                                code = ICMP_UNREACH_SRCFAIL;
                   1195:                                goto bad;
                   1196:                        }
                   1197:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1198:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1199:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1200:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1201:                        /*
                   1202:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1203:                         */
1.18      mycroft  1204:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1205:                        break;
                   1206:
                   1207:                case IPOPT_RR:
1.114     itojun   1208:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1209:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1210:                                goto bad;
                   1211:                        }
1.1       cgd      1212:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1213:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1214:                                goto bad;
                   1215:                        }
                   1216:                        /*
                   1217:                         * If no space remains, ignore.
                   1218:                         */
                   1219:                        off--;                  /* 0 origin */
1.112     sommerfe 1220:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1221:                                break;
                   1222:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1223:                            sizeof(ipaddr.sin_addr));
                   1224:                        /*
                   1225:                         * locate outgoing interface; if we're the destination,
                   1226:                         * use the incoming interface (should be same).
                   1227:                         */
1.96      thorpej  1228:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1229:                            == NULL &&
                   1230:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1231:                                type = ICMP_UNREACH;
                   1232:                                code = ICMP_UNREACH_HOST;
                   1233:                                goto bad;
                   1234:                        }
1.20      mycroft  1235:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1236:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1237:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1238:                        break;
                   1239:
                   1240:                case IPOPT_TS:
                   1241:                        code = cp - (u_char *)ip;
                   1242:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1243:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1244:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1245:                                goto bad;
1.114     itojun   1246:                        }
                   1247:                        if (ipt->ipt_ptr < 5) {
                   1248:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1249:                                goto bad;
                   1250:                        }
1.15      cgd      1251:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1252:                                if (++ipt->ipt_oflw == 0) {
                   1253:                                        code = (u_char *)&ipt->ipt_ptr -
                   1254:                                            (u_char *)ip;
1.1       cgd      1255:                                        goto bad;
1.114     itojun   1256:                                }
1.1       cgd      1257:                                break;
                   1258:                        }
1.104     thorpej  1259:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1260:                        switch (ipt->ipt_flg) {
                   1261:
                   1262:                        case IPOPT_TS_TSONLY:
                   1263:                                break;
                   1264:
                   1265:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1266:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1267:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1268:                                        code = (u_char *)&ipt->ipt_ptr -
                   1269:                                            (u_char *)ip;
1.1       cgd      1270:                                        goto bad;
1.114     itojun   1271:                                }
1.13      mycroft  1272:                                ipaddr.sin_addr = dst;
1.96      thorpej  1273:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1274:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1275:                                if (ia == 0)
                   1276:                                        continue;
1.104     thorpej  1277:                                bcopy(&ia->ia_addr.sin_addr,
                   1278:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1279:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1280:                                break;
                   1281:
                   1282:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1283:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1284:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1285:                                        code = (u_char *)&ipt->ipt_ptr -
                   1286:                                            (u_char *)ip;
1.1       cgd      1287:                                        goto bad;
1.114     itojun   1288:                                }
1.104     thorpej  1289:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1290:                                    sizeof(struct in_addr));
1.96      thorpej  1291:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1292:                                    == NULL)
1.1       cgd      1293:                                        continue;
                   1294:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1295:                                break;
                   1296:
                   1297:                        default:
1.114     itojun   1298:                                /* XXX can't take &ipt->ipt_flg */
                   1299:                                code = (u_char *)&ipt->ipt_ptr -
                   1300:                                    (u_char *)ip + 1;
1.1       cgd      1301:                                goto bad;
                   1302:                        }
                   1303:                        ntime = iptime();
1.107     thorpej  1304:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1305:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1306:                            sizeof(n_time));
                   1307:                        ipt->ipt_ptr += sizeof(n_time);
                   1308:                }
                   1309:        }
                   1310:        if (forward) {
1.26      thorpej  1311:                if (ip_forwsrcrt == 0) {
                   1312:                        type = ICMP_UNREACH;
                   1313:                        code = ICMP_UNREACH_SRCFAIL;
                   1314:                        goto bad;
                   1315:                }
1.1       cgd      1316:                ip_forward(m, 1);
                   1317:                return (1);
1.13      mycroft  1318:        }
                   1319:        return (0);
1.1       cgd      1320: bad:
1.13      mycroft  1321:        icmp_error(m, type, code, 0, 0);
                   1322:        ipstat.ips_badoptions++;
1.1       cgd      1323:        return (1);
                   1324: }
                   1325:
                   1326: /*
                   1327:  * Given address of next destination (final or next hop),
                   1328:  * return internet address info of interface to be used to get there.
                   1329:  */
                   1330: struct in_ifaddr *
                   1331: ip_rtaddr(dst)
                   1332:         struct in_addr dst;
                   1333: {
1.109     augustss 1334:        struct sockaddr_in *sin;
1.1       cgd      1335:
1.19      mycroft  1336:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1337:
1.35      mycroft  1338:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1339:                if (ipforward_rt.ro_rt) {
                   1340:                        RTFREE(ipforward_rt.ro_rt);
                   1341:                        ipforward_rt.ro_rt = 0;
                   1342:                }
                   1343:                sin->sin_family = AF_INET;
                   1344:                sin->sin_len = sizeof(*sin);
                   1345:                sin->sin_addr = dst;
                   1346:
                   1347:                rtalloc(&ipforward_rt);
                   1348:        }
                   1349:        if (ipforward_rt.ro_rt == 0)
                   1350:                return ((struct in_ifaddr *)0);
1.19      mycroft  1351:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1352: }
                   1353:
                   1354: /*
                   1355:  * Save incoming source route for use in replies,
                   1356:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1357:  */
1.13      mycroft  1358: void
1.1       cgd      1359: save_rte(option, dst)
                   1360:        u_char *option;
                   1361:        struct in_addr dst;
                   1362: {
                   1363:        unsigned olen;
                   1364:
                   1365:        olen = option[IPOPT_OLEN];
                   1366: #ifdef DIAGNOSTIC
                   1367:        if (ipprintfs)
1.39      christos 1368:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1369: #endif /* 0 */
1.1       cgd      1370:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1371:                return;
                   1372:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1373:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1374:        ip_srcrt.dst = dst;
                   1375: }
                   1376:
                   1377: /*
                   1378:  * Retrieve incoming source route for use in replies,
                   1379:  * in the same form used by setsockopt.
                   1380:  * The first hop is placed before the options, will be removed later.
                   1381:  */
                   1382: struct mbuf *
                   1383: ip_srcroute()
                   1384: {
1.109     augustss 1385:        struct in_addr *p, *q;
                   1386:        struct mbuf *m;
1.1       cgd      1387:
                   1388:        if (ip_nhops == 0)
                   1389:                return ((struct mbuf *)0);
                   1390:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1391:        if (m == 0)
                   1392:                return ((struct mbuf *)0);
                   1393:
1.13      mycroft  1394: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1395:
                   1396:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1397:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1398:            OPTSIZ;
                   1399: #ifdef DIAGNOSTIC
                   1400:        if (ipprintfs)
1.39      christos 1401:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1402: #endif
                   1403:
                   1404:        /*
                   1405:         * First save first hop for return route
                   1406:         */
                   1407:        p = &ip_srcrt.route[ip_nhops - 1];
                   1408:        *(mtod(m, struct in_addr *)) = *p--;
                   1409: #ifdef DIAGNOSTIC
                   1410:        if (ipprintfs)
1.39      christos 1411:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1412: #endif
                   1413:
                   1414:        /*
                   1415:         * Copy option fields and padding (nop) to mbuf.
                   1416:         */
                   1417:        ip_srcrt.nop = IPOPT_NOP;
                   1418:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1419:        bcopy((caddr_t)&ip_srcrt.nop,
                   1420:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1421:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1422:            sizeof(struct in_addr) + OPTSIZ);
                   1423: #undef OPTSIZ
                   1424:        /*
                   1425:         * Record return path as an IP source route,
                   1426:         * reversing the path (pointers are now aligned).
                   1427:         */
                   1428:        while (p >= ip_srcrt.route) {
                   1429: #ifdef DIAGNOSTIC
                   1430:                if (ipprintfs)
1.39      christos 1431:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1432: #endif
                   1433:                *q++ = *p--;
                   1434:        }
                   1435:        /*
                   1436:         * Last hop goes to final destination.
                   1437:         */
                   1438:        *q = ip_srcrt.dst;
                   1439: #ifdef DIAGNOSTIC
                   1440:        if (ipprintfs)
1.39      christos 1441:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1442: #endif
                   1443:        return (m);
                   1444: }
                   1445:
                   1446: /*
                   1447:  * Strip out IP options, at higher
                   1448:  * level protocol in the kernel.
                   1449:  * Second argument is buffer to which options
                   1450:  * will be moved, and return value is their length.
                   1451:  * XXX should be deleted; last arg currently ignored.
                   1452:  */
1.8       mycroft  1453: void
1.1       cgd      1454: ip_stripoptions(m, mopt)
1.109     augustss 1455:        struct mbuf *m;
1.1       cgd      1456:        struct mbuf *mopt;
                   1457: {
1.109     augustss 1458:        int i;
1.1       cgd      1459:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1460:        caddr_t opts;
1.1       cgd      1461:        int olen;
                   1462:
1.79      mycroft  1463:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1464:        opts = (caddr_t)(ip + 1);
                   1465:        i = m->m_len - (sizeof (struct ip) + olen);
                   1466:        bcopy(opts  + olen, opts, (unsigned)i);
                   1467:        m->m_len -= olen;
                   1468:        if (m->m_flags & M_PKTHDR)
                   1469:                m->m_pkthdr.len -= olen;
1.130.2.12! nathanw  1470:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1471:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1472: }
                   1473:
1.130.2.5  nathanw  1474: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1475:        0,              0,              0,              0,
                   1476:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1477:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1478:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1479:        0,              0,              0,              0,
                   1480:        ENOPROTOOPT
                   1481: };
                   1482:
                   1483: /*
                   1484:  * Forward a packet.  If some error occurs return the sender
                   1485:  * an icmp packet.  Note we can't always generate a meaningful
                   1486:  * icmp message because icmp doesn't have a large enough repertoire
                   1487:  * of codes and types.
                   1488:  *
                   1489:  * If not forwarding, just drop the packet.  This could be confusing
                   1490:  * if ipforwarding was zero but some routing protocol was advancing
                   1491:  * us as a gateway to somewhere.  However, we must let the routing
                   1492:  * protocol deal with that.
                   1493:  *
                   1494:  * The srcrt parameter indicates whether the packet is being forwarded
                   1495:  * via a source route.
                   1496:  */
1.13      mycroft  1497: void
1.1       cgd      1498: ip_forward(m, srcrt)
                   1499:        struct mbuf *m;
                   1500:        int srcrt;
                   1501: {
1.109     augustss 1502:        struct ip *ip = mtod(m, struct ip *);
                   1503:        struct sockaddr_in *sin;
                   1504:        struct rtentry *rt;
1.28      christos 1505:        int error, type = 0, code = 0;
1.1       cgd      1506:        struct mbuf *mcopy;
1.13      mycroft  1507:        n_long dest;
                   1508:        struct ifnet *destifp;
1.89      itojun   1509: #ifdef IPSEC
                   1510:        struct ifnet dummyifp;
                   1511: #endif
1.1       cgd      1512:
1.130.2.2  nathanw  1513:        /*
                   1514:         * Clear any in-bound checksum flags for this packet.
                   1515:         */
                   1516:        m->m_pkthdr.csum_flags = 0;
                   1517:
1.13      mycroft  1518:        dest = 0;
1.1       cgd      1519: #ifdef DIAGNOSTIC
                   1520:        if (ipprintfs)
1.70      thorpej  1521:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1522:                    ntohl(ip->ip_src.s_addr),
                   1523:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1524: #endif
1.93      sommerfe 1525:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1526:                ipstat.ips_cantforward++;
                   1527:                m_freem(m);
                   1528:                return;
                   1529:        }
                   1530:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1531:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1532:                return;
                   1533:        }
                   1534:        ip->ip_ttl -= IPTTLDEC;
                   1535:
1.19      mycroft  1536:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1537:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1538:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1539:                if (ipforward_rt.ro_rt) {
                   1540:                        RTFREE(ipforward_rt.ro_rt);
                   1541:                        ipforward_rt.ro_rt = 0;
                   1542:                }
                   1543:                sin->sin_family = AF_INET;
1.35      mycroft  1544:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1545:                sin->sin_addr = ip->ip_dst;
                   1546:
                   1547:                rtalloc(&ipforward_rt);
                   1548:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1549:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1550:                        return;
                   1551:                }
                   1552:                rt = ipforward_rt.ro_rt;
                   1553:        }
                   1554:
                   1555:        /*
1.34      mycroft  1556:         * Save at most 68 bytes of the packet in case
1.1       cgd      1557:         * we need to generate an ICMP message to the src.
1.119     itojun   1558:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1559:         */
1.130.2.12! nathanw  1560:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1561:        if (mcopy)
                   1562:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1563:
                   1564:        /*
                   1565:         * If forwarding packet using same interface that it came in on,
                   1566:         * perhaps should send a redirect to sender to shortcut a hop.
                   1567:         * Only send redirect if source is sending directly to us,
                   1568:         * and if packet was not source routed (or has any options).
                   1569:         * Also, don't send redirect if forwarding using a default route
                   1570:         * or a route modified by a redirect.
                   1571:         */
                   1572:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1573:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1574:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1575:            ipsendredirects && !srcrt) {
1.19      mycroft  1576:                if (rt->rt_ifa &&
                   1577:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1578:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1579:                        if (rt->rt_flags & RTF_GATEWAY)
                   1580:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1581:                        else
                   1582:                                dest = ip->ip_dst.s_addr;
                   1583:                        /*
                   1584:                         * Router requirements says to only send host
                   1585:                         * redirects.
                   1586:                         */
                   1587:                        type = ICMP_REDIRECT;
                   1588:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1589: #ifdef DIAGNOSTIC
1.77      thorpej  1590:                        if (ipprintfs)
                   1591:                                printf("redirect (%d) to %x\n", code,
                   1592:                                    (u_int32_t)dest);
1.1       cgd      1593: #endif
                   1594:                }
                   1595:        }
                   1596:
1.89      itojun   1597: #ifdef IPSEC
1.130.2.2  nathanw  1598:        /* Don't lookup socket in forwarding case */
1.127     itojun   1599:        (void)ipsec_setsocket(m, NULL);
1.103     itojun   1600: #endif
1.27      thorpej  1601:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1602:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1603:        if (error)
                   1604:                ipstat.ips_cantforward++;
                   1605:        else {
                   1606:                ipstat.ips_forward++;
                   1607:                if (type)
                   1608:                        ipstat.ips_redirectsent++;
                   1609:                else {
1.63      matt     1610:                        if (mcopy) {
                   1611: #ifdef GATEWAY
1.64      thorpej  1612:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1613:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1614: #endif
1.1       cgd      1615:                                m_freem(mcopy);
1.63      matt     1616:                        }
1.1       cgd      1617:                        return;
                   1618:                }
                   1619:        }
                   1620:        if (mcopy == NULL)
                   1621:                return;
1.13      mycroft  1622:        destifp = NULL;
                   1623:
1.1       cgd      1624:        switch (error) {
                   1625:
                   1626:        case 0:                         /* forwarded, but need redirect */
                   1627:                /* type, code set above */
                   1628:                break;
                   1629:
                   1630:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1631:        case EHOSTUNREACH:
                   1632:        case ENETDOWN:
                   1633:        case EHOSTDOWN:
                   1634:        default:
                   1635:                type = ICMP_UNREACH;
                   1636:                code = ICMP_UNREACH_HOST;
                   1637:                break;
                   1638:
                   1639:        case EMSGSIZE:
                   1640:                type = ICMP_UNREACH;
                   1641:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1642: #ifndef IPSEC
1.13      mycroft  1643:                if (ipforward_rt.ro_rt)
                   1644:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1645: #else
                   1646:                /*
                   1647:                 * If the packet is routed over IPsec tunnel, tell the
                   1648:                 * originator the tunnel MTU.
                   1649:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1650:                 * XXX quickhack!!!
                   1651:                 */
                   1652:                if (ipforward_rt.ro_rt) {
                   1653:                        struct secpolicy *sp;
                   1654:                        int ipsecerror;
1.95      itojun   1655:                        size_t ipsechdr;
1.89      itojun   1656:                        struct route *ro;
                   1657:
                   1658:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.95      itojun   1659:                                                    IPSEC_DIR_OUTBOUND,
                   1660:                                                    IP_FORWARDING,
                   1661:                                                    &ipsecerror);
1.89      itojun   1662:
                   1663:                        if (sp == NULL)
                   1664:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1665:                        else {
                   1666:                                /* count IPsec header size */
1.95      itojun   1667:                                ipsechdr = ipsec4_hdrsiz(mcopy,
                   1668:                                                         IPSEC_DIR_OUTBOUND,
                   1669:                                                         NULL);
1.89      itojun   1670:
                   1671:                                /*
                   1672:                                 * find the correct route for outer IPv4
                   1673:                                 * header, compute tunnel MTU.
                   1674:                                 *
                   1675:                                 * XXX BUG ALERT
                   1676:                                 * The "dummyifp" code relies upon the fact
                   1677:                                 * that icmp_error() touches only ifp->if_mtu.
                   1678:                                 */
                   1679:                                /*XXX*/
                   1680:                                destifp = NULL;
                   1681:                                if (sp->req != NULL
1.95      itojun   1682:                                 && sp->req->sav != NULL
                   1683:                                 && sp->req->sav->sah != NULL) {
                   1684:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1685:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1686:                                                dummyifp.if_mtu =
1.130.2.10  nathanw  1687:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1688:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1689:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1690:                                                dummyifp.if_mtu -= ipsechdr;
                   1691:                                                destifp = &dummyifp;
                   1692:                                        }
                   1693:                                }
                   1694:
                   1695:                                key_freesp(sp);
                   1696:                        }
                   1697:                }
                   1698: #endif /*IPSEC*/
1.1       cgd      1699:                ipstat.ips_cantfrag++;
                   1700:                break;
                   1701:
                   1702:        case ENOBUFS:
1.130.2.7  nathanw  1703: #if 1
                   1704:                /*
                   1705:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1706:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1707:                 * source quench could be a big problem under DoS attacks,
1.130.2.10  nathanw  1708:                 * or if the underlying interface is rate-limited.
1.130.2.7  nathanw  1709:                 */
                   1710:                if (mcopy)
                   1711:                        m_freem(mcopy);
                   1712:                return;
                   1713: #else
1.1       cgd      1714:                type = ICMP_SOURCEQUENCH;
                   1715:                code = 0;
                   1716:                break;
1.130.2.7  nathanw  1717: #endif
1.1       cgd      1718:        }
1.13      mycroft  1719:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1720: }
                   1721:
                   1722: void
                   1723: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1724:        struct inpcb *inp;
                   1725:        struct mbuf **mp;
                   1726:        struct ip *ip;
                   1727:        struct mbuf *m;
1.44      thorpej  1728: {
                   1729:
                   1730:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1731:                struct timeval tv;
                   1732:
                   1733:                microtime(&tv);
                   1734:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1735:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1736:                if (*mp)
                   1737:                        mp = &(*mp)->m_next;
                   1738:        }
                   1739:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1740:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1741:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1742:                if (*mp)
                   1743:                        mp = &(*mp)->m_next;
                   1744:        }
                   1745: #ifdef notyet
                   1746:        /*
                   1747:         * XXX
                   1748:         * Moving these out of udp_input() made them even more broken
                   1749:         * than they already were.
                   1750:         *      - fenner@parc.xerox.com
                   1751:         */
                   1752:        /* options were tossed already */
                   1753:        if (inp->inp_flags & INP_RECVOPTS) {
                   1754:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1755:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1756:                if (*mp)
                   1757:                        mp = &(*mp)->m_next;
                   1758:        }
                   1759:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1760:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1761:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1762:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1763:                if (*mp)
                   1764:                        mp = &(*mp)->m_next;
                   1765:        }
                   1766: #endif
                   1767:        if (inp->inp_flags & INP_RECVIF) {
                   1768:                struct sockaddr_dl sdl;
                   1769:
                   1770:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1771:                sdl.sdl_family = AF_LINK;
                   1772:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1773:                    m->m_pkthdr.rcvif->if_index : 0;
                   1774:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1775:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1776:                    IP_RECVIF, IPPROTO_IP);
                   1777:                if (*mp)
                   1778:                        mp = &(*mp)->m_next;
                   1779:        }
1.13      mycroft  1780: }
                   1781:
                   1782: int
                   1783: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1784:        int *name;
                   1785:        u_int namelen;
                   1786:        void *oldp;
                   1787:        size_t *oldlenp;
                   1788:        void *newp;
                   1789:        size_t newlen;
                   1790: {
1.88      sommerfe 1791:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1792:
1.54      lukem    1793:        int error, old;
                   1794:
1.13      mycroft  1795:        /* All sysctl names at this level are terminal. */
                   1796:        if (namelen != 1)
                   1797:                return (ENOTDIR);
                   1798:
                   1799:        switch (name[0]) {
                   1800:        case IPCTL_FORWARDING:
                   1801:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1802:        case IPCTL_SENDREDIRECTS:
                   1803:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1804:                        &ipsendredirects));
                   1805:        case IPCTL_DEFTTL:
                   1806:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1807: #ifdef notyet
                   1808:        case IPCTL_DEFMTU:
                   1809:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1810: #endif
1.26      thorpej  1811:        case IPCTL_FORWSRCRT:
1.47      cjs      1812:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1813:                if (securelevel > 0)
1.46      cjs      1814:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1815:                            ip_forwsrcrt));
                   1816:                else
                   1817:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1818:                            &ip_forwsrcrt));
1.27      thorpej  1819:        case IPCTL_DIRECTEDBCAST:
                   1820:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1821:                    &ip_directedbcast));
1.47      cjs      1822:        case IPCTL_ALLOWSRCRT:
                   1823:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1824:                    &ip_allowsrcrt));
1.52      thorpej  1825:        case IPCTL_SUBNETSARELOCAL:
                   1826:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1827:                    &subnetsarelocal));
1.53      kml      1828:        case IPCTL_MTUDISC:
1.60      kml      1829:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1830:                    &ip_mtudisc);
                   1831:                if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1.130.2.10  nathanw  1832:                        ip_mtudisc_timeout_q =
1.60      kml      1833:                            rt_timer_queue_create(ip_mtudisc_timeout);
                   1834:                } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
                   1835:                        rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
                   1836:                        ip_mtudisc_timeout_q = NULL;
                   1837:                }
                   1838:                return error;
1.54      lukem    1839:        case IPCTL_ANONPORTMIN:
                   1840:                old = anonportmin;
                   1841:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1842:                if (anonportmin >= anonportmax || anonportmin < 0
                   1843:                    || anonportmin > 65535
1.54      lukem    1844: #ifndef IPNOPRIVPORTS
                   1845:                    || anonportmin < IPPORT_RESERVED
                   1846: #endif
                   1847:                    ) {
                   1848:                        anonportmin = old;
                   1849:                        return (EINVAL);
                   1850:                }
                   1851:                return (error);
                   1852:        case IPCTL_ANONPORTMAX:
                   1853:                old = anonportmax;
                   1854:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1855:                if (anonportmin >= anonportmax || anonportmax < 0
                   1856:                    || anonportmax > 65535
1.54      lukem    1857: #ifndef IPNOPRIVPORTS
                   1858:                    || anonportmax < IPPORT_RESERVED
                   1859: #endif
                   1860:                    ) {
                   1861:                        anonportmax = old;
                   1862:                        return (EINVAL);
                   1863:                }
1.60      kml      1864:                return (error);
                   1865:        case IPCTL_MTUDISCTIMEOUT:
                   1866:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1867:                   &ip_mtudisc_timeout);
                   1868:                if (ip_mtudisc_timeout_q != NULL)
1.130.2.10  nathanw  1869:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
1.60      kml      1870:                                              ip_mtudisc_timeout);
1.54      lukem    1871:                return (error);
1.65      matt     1872: #ifdef GATEWAY
                   1873:        case IPCTL_MAXFLOWS:
1.67      thorpej  1874:            {
                   1875:                int s;
                   1876:
1.65      matt     1877:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1878:                   &ip_maxflows);
1.67      thorpej  1879:                s = splsoftnet();
1.65      matt     1880:                ipflow_reap(0);
1.67      thorpej  1881:                splx(s);
1.65      matt     1882:                return (error);
1.67      thorpej  1883:            }
1.89      itojun   1884: #endif
1.90      itojun   1885:        case IPCTL_HOSTZEROBROADCAST:
                   1886:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1887:                    &hostzeroisbroadcast));
1.89      itojun   1888: #if NGIF > 0
                   1889:        case IPCTL_GIF_TTL:
                   1890:                return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1891:                                  &ip_gif_ttl));
1.130.2.7  nathanw  1892: #endif
                   1893:
                   1894: #if NGRE > 0
                   1895:        case IPCTL_GRE_TTL:
                   1896:                return(sysctl_int(oldp, oldlenp, newp, newlen,
                   1897:                                  &ip_gre_ttl));
1.117     tron     1898: #endif
                   1899:
                   1900: #ifndef IPNOPRIVPORTS
                   1901:        case IPCTL_LOWPORTMIN:
                   1902:                old = lowportmin;
                   1903:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   1904:                if (lowportmin >= lowportmax
                   1905:                    || lowportmin > IPPORT_RESERVEDMAX
                   1906:                    || lowportmin < IPPORT_RESERVEDMIN
                   1907:                    ) {
                   1908:                        lowportmin = old;
                   1909:                        return (EINVAL);
                   1910:                }
                   1911:                return (error);
                   1912:        case IPCTL_LOWPORTMAX:
                   1913:                old = lowportmax;
                   1914:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   1915:                if (lowportmin >= lowportmax
                   1916:                    || lowportmax > IPPORT_RESERVEDMAX
                   1917:                    || lowportmax < IPPORT_RESERVEDMIN
                   1918:                    ) {
                   1919:                        lowportmax = old;
                   1920:                        return (EINVAL);
                   1921:                }
                   1922:                return (error);
1.65      matt     1923: #endif
1.130.2.1  nathanw  1924:
                   1925:        case IPCTL_MAXFRAGPACKETS:
                   1926:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1927:                    &ip_maxfragpackets));
1.88      sommerfe 1928:
1.13      mycroft  1929:        default:
                   1930:                return (EOPNOTSUPP);
                   1931:        }
                   1932:        /* NOTREACHED */
1.1       cgd      1933: }

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