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Annotation of src/sys/netinet/ip_input.c, Revision 1.186

1.186   ! scw         1: /*     $NetBSD: ip_input.c,v 1.185 2003/11/19 22:40:55 fvdl Exp $      */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
1.172     agc        81:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        82:  *    may be used to endorse or promote products derived from this software
                     83:  *    without specific prior written permission.
                     84:  *
                     85:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     86:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     87:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     88:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     89:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     90:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     91:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     92:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     93:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     94:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     95:  * SUCH DAMAGE.
                     96:  *
1.14      cgd        97:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        98:  */
1.141     lukem      99:
                    100: #include <sys/cdefs.h>
1.186   ! scw       101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.185 2003/11/19 22:40:55 fvdl Exp $");
1.55      scottr    102:
1.184     jonathan  103: #include "opt_inet.h"
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91      thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.167     martin    108: #include "opt_mbuftrace.h"
1.135     thorpej   109: #include "opt_inet_csum.h"
1.1       cgd       110:
1.5       mycroft   111: #include <sys/param.h>
                    112: #include <sys/systm.h>
                    113: #include <sys/malloc.h>
                    114: #include <sys/mbuf.h>
                    115: #include <sys/domain.h>
                    116: #include <sys/protosw.h>
                    117: #include <sys/socket.h>
1.44      thorpej   118: #include <sys/socketvar.h>
1.5       mycroft   119: #include <sys/errno.h>
                    120: #include <sys/time.h>
                    121: #include <sys/kernel.h>
1.72      thorpej   122: #include <sys/pool.h>
1.28      christos  123: #include <sys/sysctl.h>
1.1       cgd       124:
1.5       mycroft   125: #include <net/if.h>
1.44      thorpej   126: #include <net/if_dl.h>
1.5       mycroft   127: #include <net/route.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
                    134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
                    136: #include <netinet/ip_icmp.h>
1.89      itojun    137: /* just for gif_ttl */
                    138: #include <netinet/in_gif.h>
                    139: #include "gif.h"
1.144     martin    140: #include <net/if_gre.h>
                    141: #include "gre.h"
1.111     jdolecek  142:
                    143: #ifdef MROUTING
                    144: #include <netinet/ip_mroute.h>
                    145: #endif
1.89      itojun    146:
                    147: #ifdef IPSEC
                    148: #include <netinet6/ipsec.h>
                    149: #include <netkey/key.h>
                    150: #endif
1.173     jonathan  151: #ifdef FAST_IPSEC
                    152: #include <netipsec/ipsec.h>
                    153: #include <netipsec/key.h>
                    154: #endif /* FAST_IPSEC*/
1.44      thorpej   155:
1.1       cgd       156: #ifndef        IPFORWARDING
                    157: #ifdef GATEWAY
                    158: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    159: #else /* GATEWAY */
                    160: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    161: #endif /* GATEWAY */
                    162: #endif /* IPFORWARDING */
                    163: #ifndef        IPSENDREDIRECTS
                    164: #define        IPSENDREDIRECTS 1
                    165: #endif
1.26      thorpej   166: #ifndef IPFORWSRCRT
1.47      cjs       167: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    168: #endif
                    169: #ifndef IPALLOWSRCRT
1.48      mrg       170: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   171: #endif
1.53      kml       172: #ifndef IPMTUDISC
1.153     itojun    173: #define IPMTUDISC      1
1.53      kml       174: #endif
1.60      kml       175: #ifndef IPMTUDISCTIMEOUT
1.61      kml       176: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       177: #endif
1.53      kml       178:
1.27      thorpej   179: /*
                    180:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    181:  * configuration using this option will Just Work.
                    182:  */
                    183: #ifndef IPDIRECTEDBCAST
                    184: #ifdef DIRECTED_BROADCAST
                    185: #define IPDIRECTEDBCAST        1
                    186: #else
                    187: #define        IPDIRECTEDBCAST 0
                    188: #endif /* DIRECTED_BROADCAST */
                    189: #endif /* IPDIRECTEDBCAST */
1.1       cgd       190: int    ipforwarding = IPFORWARDING;
                    191: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   192: int    ip_defttl = IPDEFTTL;
1.26      thorpej   193: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   194: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       195: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       196: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    197: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       198: #ifdef DIAGNOSTIC
                    199: int    ipprintfs = 0;
                    200: #endif
1.184     jonathan  201:
                    202: #ifdef RANDOM_IP_ID
                    203: int    ip_do_randomid = 0;
                    204: #endif
                    205:
1.165     christos  206: /*
                    207:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    208:  * the Strong ES model described in RFC 1122, but since the routing table
                    209:  * and transmit implementation do not implement the Strong ES model,
                    210:  * setting this to 1 results in an odd hybrid.
                    211:  *
                    212:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    213:  * to translate the destination address to another local interface.
                    214:  *
                    215:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    216:  * to the loopback interface instead of the interface where the
                    217:  * packets for those addresses are received.
                    218:  */
                    219: int    ip_checkinterface = 0;
                    220:
1.1       cgd       221:
1.60      kml       222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    223:
1.1       cgd       224: extern struct domain inetdomain;
                    225: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      226: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    227: int    in_ifaddrentries;                       /* total number of addrs */
1.181     jonathan  228: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       229: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      230: u_long in_multihash;                           /* size of hash table - 1 */
                    231: int    in_multientries;                        /* total number of addrs */
                    232: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   233: struct ifqueue ipintrq;
1.63      matt      234: struct ipstat  ipstat;
1.183     jonathan  235: uint16_t ip_id;
1.75      thorpej   236:
1.121     thorpej   237: #ifdef PFIL_HOOKS
                    238: struct pfil_head inet_pfil_hook;
                    239: #endif
                    240:
1.63      matt      241: struct ipqhead ipq;
1.75      thorpej   242: int    ipq_locked;
1.131     itojun    243: int    ip_nfragpackets = 0;
1.133     itojun    244: int    ip_maxfragpackets = 200;
1.75      thorpej   245:
                    246: static __inline int ipq_lock_try __P((void));
                    247: static __inline void ipq_unlock __P((void));
                    248:
                    249: static __inline int
                    250: ipq_lock_try()
                    251: {
                    252:        int s;
                    253:
1.132     thorpej   254:        /*
1.149     wiz       255:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   256:         * mbuf allocation.
                    257:         */
                    258:        s = splvm();
1.75      thorpej   259:        if (ipq_locked) {
                    260:                splx(s);
                    261:                return (0);
                    262:        }
                    263:        ipq_locked = 1;
                    264:        splx(s);
                    265:        return (1);
                    266: }
                    267:
                    268: static __inline void
                    269: ipq_unlock()
                    270: {
                    271:        int s;
                    272:
1.132     thorpej   273:        s = splvm();
1.75      thorpej   274:        ipq_locked = 0;
                    275:        splx(s);
                    276: }
                    277:
                    278: #ifdef DIAGNOSTIC
                    279: #define        IPQ_LOCK()                                                      \
                    280: do {                                                                   \
                    281:        if (ipq_lock_try() == 0) {                                      \
                    282:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    283:                panic("ipq_lock");                                      \
                    284:        }                                                               \
1.159     perry     285: } while (/*CONSTCOND*/ 0)
1.75      thorpej   286: #define        IPQ_LOCK_CHECK()                                                \
                    287: do {                                                                   \
                    288:        if (ipq_locked == 0) {                                          \
                    289:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    290:                panic("ipq lock check");                                \
                    291:        }                                                               \
1.159     perry     292: } while (/*CONSTCOND*/ 0)
1.75      thorpej   293: #else
                    294: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    295: #define        IPQ_LOCK_CHECK()        /* nothing */
                    296: #endif
                    297:
                    298: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       299:
1.166     matt      300: struct pool inmulti_pool;
1.72      thorpej   301: struct pool ipqent_pool;
                    302:
1.135     thorpej   303: #ifdef INET_CSUM_COUNTERS
                    304: #include <sys/device.h>
                    305:
                    306: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    307:     NULL, "inet", "hwcsum bad");
                    308: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    309:     NULL, "inet", "hwcsum ok");
                    310: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    311:     NULL, "inet", "swcsum");
                    312:
                    313: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    314:
                    315: #else
                    316:
                    317: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    318:
                    319: #endif /* INET_CSUM_COUNTERS */
                    320:
1.1       cgd       321: /*
                    322:  * We need to save the IP options in case a protocol wants to respond
                    323:  * to an incoming packet over the same route if the packet got here
                    324:  * using IP source routing.  This allows connection establishment and
                    325:  * maintenance when the remote end is on a network that is not known
                    326:  * to us.
                    327:  */
                    328: int    ip_nhops = 0;
                    329: static struct ip_srcrt {
                    330:        struct  in_addr dst;                    /* final destination */
                    331:        char    nop;                            /* one NOP to align */
                    332:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    333:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    334: } ip_srcrt;
                    335:
1.13      mycroft   336: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   337:
1.164     matt      338: #ifdef MBUFTRACE
                    339: struct mowner ip_rx_mowner = { "internet", "rx" };
                    340: struct mowner ip_tx_mowner = { "internet", "tx" };
                    341: #endif
                    342:
1.1       cgd       343: /*
                    344:  * IP initialization: fill in IP protocol switch table.
                    345:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    346:  */
1.8       mycroft   347: void
1.1       cgd       348: ip_init()
                    349: {
1.109     augustss  350:        struct protosw *pr;
                    351:        int i;
1.1       cgd       352:
1.166     matt      353:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    354:            NULL);
1.72      thorpej   355:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   356:            NULL);
1.72      thorpej   357:
1.1       cgd       358:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    359:        if (pr == 0)
                    360:                panic("ip_init");
                    361:        for (i = 0; i < IPPROTO_MAX; i++)
                    362:                ip_protox[i] = pr - inetsw;
                    363:        for (pr = inetdomain.dom_protosw;
                    364:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    365:                if (pr->pr_domain->dom_family == PF_INET &&
                    366:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    367:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       368:        LIST_INIT(&ipq);
1.183     jonathan  369:        ip_id = time.tv_sec & 0xfffff;
1.1       cgd       370:        ipintrq.ifq_maxlen = ipqmaxlen;
1.181     jonathan  371:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        372:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    373:            M_WAITOK, &in_ifaddrhash);
1.166     matt      374:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    375:            M_WAITOK, &in_multihash);
1.160     itojun    376:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   377: #ifdef GATEWAY
                    378:        ipflow_init();
                    379: #endif
1.121     thorpej   380:
                    381: #ifdef PFIL_HOOKS
                    382:        /* Register our Packet Filter hook. */
1.126     thorpej   383:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    384:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   385:        i = pfil_head_register(&inet_pfil_hook);
                    386:        if (i != 0)
                    387:                printf("ip_init: WARNING: unable to register pfil hook, "
                    388:                    "error %d\n", i);
                    389: #endif /* PFIL_HOOKS */
1.135     thorpej   390:
                    391: #ifdef INET_CSUM_COUNTERS
                    392:        evcnt_attach_static(&ip_hwcsum_bad);
                    393:        evcnt_attach_static(&ip_hwcsum_ok);
                    394:        evcnt_attach_static(&ip_swcsum);
                    395: #endif /* INET_CSUM_COUNTERS */
1.164     matt      396:
                    397: #ifdef MBUFTRACE
                    398:        MOWNER_ATTACH(&ip_tx_mowner);
                    399:        MOWNER_ATTACH(&ip_rx_mowner);
                    400: #endif /* MBUFTRACE */
1.1       cgd       401: }
                    402:
                    403: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    404: struct route ipforward_rt;
                    405:
                    406: /*
1.89      itojun    407:  * IP software interrupt routine
                    408:  */
                    409: void
                    410: ipintr()
                    411: {
                    412:        int s;
                    413:        struct mbuf *m;
                    414:
                    415:        while (1) {
1.132     thorpej   416:                s = splnet();
1.89      itojun    417:                IF_DEQUEUE(&ipintrq, m);
                    418:                splx(s);
                    419:                if (m == 0)
                    420:                        return;
1.164     matt      421:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    422:                ip_input(m);
                    423:        }
                    424: }
                    425:
                    426: /*
1.1       cgd       427:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    428:  * try to reassemble.  Process options.  Pass to next level.
                    429:  */
1.8       mycroft   430: void
1.89      itojun    431: ip_input(struct mbuf *m)
1.1       cgd       432: {
1.109     augustss  433:        struct ip *ip = NULL;
                    434:        struct ipq *fp;
                    435:        struct in_ifaddr *ia;
                    436:        struct ifaddr *ifa;
1.25      cgd       437:        struct ipqent *ipqe;
1.89      itojun    438:        int hlen = 0, mff, len;
1.100     itojun    439:        int downmatch;
1.165     christos  440:        int checkif;
1.169     itojun    441:        int srcrt = 0;
1.173     jonathan  442: #ifdef FAST_IPSEC
                    443:        struct m_tag *mtag;
                    444:        struct tdb_ident *tdbi;
                    445:        struct secpolicy *sp;
                    446:        int s, error;
                    447: #endif /* FAST_IPSEC */
1.1       cgd       448:
1.164     matt      449:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       450: #ifdef DIAGNOSTIC
                    451:        if ((m->m_flags & M_PKTHDR) == 0)
                    452:                panic("ipintr no HDR");
1.89      itojun    453: #endif
1.164     matt      454:
1.1       cgd       455:        /*
                    456:         * If no IP addresses have been set yet but the interfaces
                    457:         * are receiving, can't do anything with incoming packets yet.
                    458:         */
1.181     jonathan  459:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       460:                goto bad;
                    461:        ipstat.ips_total++;
1.154     thorpej   462:        /*
                    463:         * If the IP header is not aligned, slurp it up into a new
                    464:         * mbuf with space for link headers, in the event we forward
                    465:         * it.  Otherwise, if it is aligned, make sure the entire
                    466:         * base IP header is in the first mbuf of the chain.
                    467:         */
                    468:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    469:                if ((m = m_copyup(m, sizeof(struct ip),
                    470:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    471:                        /* XXXJRT new stat, please */
                    472:                        ipstat.ips_toosmall++;
                    473:                        return;
                    474:                }
                    475:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    476:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    477:                        ipstat.ips_toosmall++;
                    478:                        return;
                    479:                }
1.1       cgd       480:        }
                    481:        ip = mtod(m, struct ip *);
1.13      mycroft   482:        if (ip->ip_v != IPVERSION) {
                    483:                ipstat.ips_badvers++;
                    484:                goto bad;
                    485:        }
1.1       cgd       486:        hlen = ip->ip_hl << 2;
                    487:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    488:                ipstat.ips_badhlen++;
                    489:                goto bad;
                    490:        }
                    491:        if (hlen > m->m_len) {
                    492:                if ((m = m_pullup(m, hlen)) == 0) {
                    493:                        ipstat.ips_badhlen++;
1.89      itojun    494:                        return;
1.1       cgd       495:                }
                    496:                ip = mtod(m, struct ip *);
                    497:        }
1.98      thorpej   498:
1.85      hwr       499:        /*
1.99      thorpej   500:         * RFC1122: packets with a multicast source address are
1.98      thorpej   501:         * not allowed.
1.85      hwr       502:         */
                    503:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    504:                ipstat.ips_badaddr++;
1.85      hwr       505:                goto bad;
1.129     itojun    506:        }
                    507:
                    508:        /* 127/8 must not appear on wire - RFC1122 */
                    509:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    510:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    511:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    512:                        ipstat.ips_badaddr++;
1.129     itojun    513:                        goto bad;
1.130     itojun    514:                }
1.85      hwr       515:        }
                    516:
1.135     thorpej   517:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   518:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   519:                 M_CSUM_IPv4_BAD)) {
                    520:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    521:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    522:                goto badcsum;
                    523:
                    524:        case M_CSUM_IPv4:
                    525:                /* Checksum was okay. */
                    526:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    527:                break;
                    528:
                    529:        default:
                    530:                /* Must compute it ourselves. */
                    531:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    532:                if (in_cksum(m, hlen) != 0)
                    533:                        goto bad;
                    534:                break;
1.1       cgd       535:        }
                    536:
1.121     thorpej   537:        /* Retrieve the packet length. */
                    538:        len = ntohs(ip->ip_len);
1.81      proff     539:
                    540:        /*
                    541:         * Check for additional length bogosity
                    542:         */
1.84      proff     543:        if (len < hlen) {
1.81      proff     544:                ipstat.ips_badlen++;
                    545:                goto bad;
                    546:        }
1.1       cgd       547:
                    548:        /*
                    549:         * Check that the amount of data in the buffers
                    550:         * is as at least much as the IP header would have us expect.
                    551:         * Trim mbufs if longer than we expect.
                    552:         * Drop packet if shorter than we expect.
                    553:         */
1.35      mycroft   554:        if (m->m_pkthdr.len < len) {
1.1       cgd       555:                ipstat.ips_tooshort++;
                    556:                goto bad;
                    557:        }
1.35      mycroft   558:        if (m->m_pkthdr.len > len) {
1.1       cgd       559:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   560:                        m->m_len = len;
                    561:                        m->m_pkthdr.len = len;
1.1       cgd       562:                } else
1.35      mycroft   563:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       564:        }
                    565:
1.94      itojun    566: #ifdef IPSEC
1.149     wiz       567:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    568:        m->m_flags &= ~M_CANFASTFWD;
                    569: #else
1.64      thorpej   570:        /*
                    571:         * Assume that we can create a fast-forward IP flow entry
                    572:         * based on this packet.
                    573:         */
                    574:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    575: #endif
1.64      thorpej   576:
1.36      mrg       577: #ifdef PFIL_HOOKS
1.33      mrg       578:        /*
1.64      thorpej   579:         * Run through list of hooks for input packets.  If there are any
                    580:         * filters which require that additional packets in the flow are
                    581:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    582:         * Note that filters must _never_ set this flag, as another filter
                    583:         * in the list may have previously cleared it.
1.33      mrg       584:         */
1.127     itojun    585:        /*
                    586:         * let ipfilter look at packet on the wire,
                    587:         * not the decapsulated packet.
                    588:         */
                    589: #ifdef IPSEC
1.136     itojun    590:        if (!ipsec_getnhist(m))
1.186   ! scw       591: #elif defined(FAST_IPSEC)
        !           592:        if (!ipsec_indone(m))
1.127     itojun    593: #else
                    594:        if (1)
                    595: #endif
                    596:        {
1.169     itojun    597:                struct in_addr odst;
                    598:
                    599:                odst = ip->ip_dst;
1.127     itojun    600:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    601:                    PFIL_IN) != 0)
                    602:                        return;
1.127     itojun    603:                if (m == NULL)
                    604:                        return;
                    605:                ip = mtod(m, struct ip *);
1.142     darrenr   606:                hlen = ip->ip_hl << 2;
1.169     itojun    607:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    608:        }
1.36      mrg       609: #endif /* PFIL_HOOKS */
1.123     thorpej   610:
                    611: #ifdef ALTQ
                    612:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    613:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    614:                /* packet dropped by traffic conditioner */
                    615:                return;
                    616:        }
                    617: #endif
1.121     thorpej   618:
                    619:        /*
1.1       cgd       620:         * Process options and, if not destined for us,
                    621:         * ship it on.  ip_dooptions returns 1 when an
                    622:         * error was detected (causing an icmp message
                    623:         * to be sent and the original packet to be freed).
                    624:         */
                    625:        ip_nhops = 0;           /* for source routed packets */
                    626:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    627:                return;
1.1       cgd       628:
                    629:        /*
1.165     christos  630:         * Enable a consistency check between the destination address
                    631:         * and the arrival interface for a unicast packet (the RFC 1122
                    632:         * strong ES model) if IP forwarding is disabled and the packet
                    633:         * is not locally generated.
                    634:         *
                    635:         * XXX - Checking also should be disabled if the destination
                    636:         * address is ipnat'ed to a different interface.
                    637:         *
                    638:         * XXX - Checking is incompatible with IP aliases added
                    639:         * to the loopback interface instead of the interface where
                    640:         * the packets are received.
                    641:         *
                    642:         * XXX - We need to add a per ifaddr flag for this so that
                    643:         * we get finer grain control.
                    644:         */
                    645:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    646:            (m->m_pkthdr.rcvif != NULL) &&
                    647:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    648:
                    649:        /*
1.1       cgd       650:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    651:         *
                    652:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    653:         * The behavior here is to treat addresses on !IFF_UP interface
                    654:         * as not mine.
1.1       cgd       655:         */
1.100     itojun    656:        downmatch = 0;
1.140     matt      657:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    658:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  659:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    660:                                continue;
1.97      itojun    661:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    662:                                break;
1.100     itojun    663:                        else
                    664:                                downmatch++;
1.97      itojun    665:                }
                    666:        }
1.86      thorpej   667:        if (ia != NULL)
                    668:                goto ours;
1.57      tls       669:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      670:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    671:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    672:                                continue;
1.57      tls       673:                        ia = ifatoia(ifa);
1.35      mycroft   674:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    675:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   676:                            /*
                    677:                             * Look for all-0's host part (old broadcast addr),
                    678:                             * either for subnet or net.
                    679:                             */
                    680:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   681:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       682:                                goto ours;
1.57      tls       683:                        /*
                    684:                         * An interface with IP address zero accepts
                    685:                         * all packets that arrive on that interface.
                    686:                         */
                    687:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    688:                                goto ours;
1.1       cgd       689:                }
                    690:        }
1.18      mycroft   691:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   692:                struct in_multi *inm;
                    693: #ifdef MROUTING
                    694:                extern struct socket *ip_mrouter;
1.10      brezak    695:
1.147     matt      696:                if (M_READONLY(m)) {
1.10      brezak    697:                        if ((m = m_pullup(m, hlen)) == 0) {
                    698:                                ipstat.ips_toosmall++;
1.89      itojun    699:                                return;
1.10      brezak    700:                        }
                    701:                        ip = mtod(m, struct ip *);
                    702:                }
1.4       hpeyerl   703:
                    704:                if (ip_mrouter) {
                    705:                        /*
                    706:                         * If we are acting as a multicast router, all
                    707:                         * incoming multicast packets are passed to the
                    708:                         * kernel-level multicast forwarding function.
                    709:                         * The packet is returned (relatively) intact; if
                    710:                         * ip_mforward() returns a non-zero value, the packet
                    711:                         * must be discarded, else it may be accepted below.
                    712:                         *
                    713:                         * (The IP ident field is put in the same byte order
                    714:                         * as expected when ip_mforward() is called from
                    715:                         * ip_output().)
                    716:                         */
1.13      mycroft   717:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    718:                                ipstat.ips_cantforward++;
1.4       hpeyerl   719:                                m_freem(m);
1.89      itojun    720:                                return;
1.4       hpeyerl   721:                        }
                    722:
                    723:                        /*
                    724:                         * The process-level routing demon needs to receive
                    725:                         * all multicast IGMP packets, whether or not this
                    726:                         * host belongs to their destination groups.
                    727:                         */
                    728:                        if (ip->ip_p == IPPROTO_IGMP)
                    729:                                goto ours;
1.13      mycroft   730:                        ipstat.ips_forward++;
1.4       hpeyerl   731:                }
                    732: #endif
                    733:                /*
                    734:                 * See if we belong to the destination multicast group on the
                    735:                 * arrival interface.
                    736:                 */
                    737:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    738:                if (inm == NULL) {
1.13      mycroft   739:                        ipstat.ips_cantforward++;
1.4       hpeyerl   740:                        m_freem(m);
1.89      itojun    741:                        return;
1.4       hpeyerl   742:                }
                    743:                goto ours;
                    744:        }
1.19      mycroft   745:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   746:            in_nullhost(ip->ip_dst))
1.1       cgd       747:                goto ours;
                    748:
                    749:        /*
                    750:         * Not for us; forward if possible and desirable.
                    751:         */
                    752:        if (ipforwarding == 0) {
                    753:                ipstat.ips_cantforward++;
                    754:                m_freem(m);
1.100     itojun    755:        } else {
                    756:                /*
                    757:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    758:                 * and there's no IFF_UP interface that matches ip_dst,
                    759:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    760:                 * forwarding loop till TTL goes to 0.
                    761:                 */
                    762:                if (downmatch) {
                    763:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    764:                        ipstat.ips_cantforward++;
                    765:                        return;
                    766:                }
1.145     itojun    767: #ifdef IPSEC
                    768:                if (ipsec4_in_reject(m, NULL)) {
                    769:                        ipsecstat.in_polvio++;
                    770:                        goto bad;
                    771:                }
                    772: #endif
1.173     jonathan  773: #ifdef FAST_IPSEC
                    774:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    775:                s = splsoftnet();
                    776:                if (mtag != NULL) {
                    777:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    778:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    779:                } else {
                    780:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    781:                                                   IP_FORWARDING, &error);
                    782:                }
                    783:                if (sp == NULL) {       /* NB: can happen if error */
                    784:                        splx(s);
                    785:                        /*XXX error stat???*/
                    786:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    787:                        goto bad;
                    788:                }
                    789:
                    790:                /*
                    791:                 * Check security policy against packet attributes.
                    792:                 */
                    793:                error = ipsec_in_reject(sp, m);
                    794:                KEY_FREESP(&sp);
                    795:                splx(s);
                    796:                if (error) {
                    797:                        ipstat.ips_cantforward++;
                    798:                        goto bad;
                    799:                }
                    800: #endif /* FAST_IPSEC */
1.145     itojun    801:
1.169     itojun    802:                ip_forward(m, srcrt);
1.100     itojun    803:        }
1.89      itojun    804:        return;
1.1       cgd       805:
                    806: ours:
                    807:        /*
                    808:         * If offset or IP_MF are set, must reassemble.
                    809:         * Otherwise, nothing need be done.
                    810:         * (We could look in the reassembly queue to see
                    811:         * if the packet was previously fragmented,
                    812:         * but it's not worth the time; just let them time out.)
                    813:         */
1.155     itojun    814:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    815:                if (M_READONLY(m)) {
                    816:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    817:                                ipstat.ips_toosmall++;
                    818:                                goto bad;
                    819:                        }
                    820:                        ip = mtod(m, struct ip *);
                    821:                }
                    822:
1.1       cgd       823:                /*
                    824:                 * Look for queue of fragments
                    825:                 * of this datagram.
                    826:                 */
1.75      thorpej   827:                IPQ_LOCK();
1.140     matt      828:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       829:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   830:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    831:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       832:                            ip->ip_p == fp->ipq_p)
                    833:                                goto found;
                    834:                fp = 0;
                    835: found:
                    836:
                    837:                /*
                    838:                 * Adjust ip_len to not reflect header,
1.25      cgd       839:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       840:                 * convert offset of this to bytes.
                    841:                 */
1.155     itojun    842:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    843:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       844:                if (mff) {
1.16      cgd       845:                        /*
                    846:                         * Make sure that fragments have a data length
                    847:                         * that's a non-zero multiple of 8 bytes.
                    848:                         */
1.155     itojun    849:                        if (ntohs(ip->ip_len) == 0 ||
                    850:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       851:                                ipstat.ips_badfrags++;
1.75      thorpej   852:                                IPQ_UNLOCK();
1.16      cgd       853:                                goto bad;
                    854:                        }
                    855:                }
1.155     itojun    856:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       857:
                    858:                /*
                    859:                 * If datagram marked as having more fragments
                    860:                 * or if this is not the first fragment,
                    861:                 * attempt reassembly; if it succeeds, proceed.
                    862:                 */
1.155     itojun    863:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       864:                        ipstat.ips_fragments++;
1.72      thorpej   865:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       866:                        if (ipqe == NULL) {
                    867:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   868:                                IPQ_UNLOCK();
1.25      cgd       869:                                goto bad;
                    870:                        }
                    871:                        ipqe->ipqe_mff = mff;
1.50      thorpej   872:                        ipqe->ipqe_m = m;
1.25      cgd       873:                        ipqe->ipqe_ip = ip;
1.50      thorpej   874:                        m = ip_reass(ipqe, fp);
1.75      thorpej   875:                        if (m == 0) {
                    876:                                IPQ_UNLOCK();
1.89      itojun    877:                                return;
1.75      thorpej   878:                        }
1.13      mycroft   879:                        ipstat.ips_reassembled++;
1.50      thorpej   880:                        ip = mtod(m, struct ip *);
1.74      thorpej   881:                        hlen = ip->ip_hl << 2;
1.155     itojun    882:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       883:                } else
                    884:                        if (fp)
                    885:                                ip_freef(fp);
1.75      thorpej   886:                IPQ_UNLOCK();
1.79      mycroft   887:        }
1.128     itojun    888:
1.173     jonathan  889: #if defined(IPSEC)
1.128     itojun    890:        /*
                    891:         * enforce IPsec policy checking if we are seeing last header.
                    892:         * note that we do not visit this with protocols with pcb layer
                    893:         * code - like udp/tcp/raw ip.
                    894:         */
                    895:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    896:            ipsec4_in_reject(m, NULL)) {
                    897:                ipsecstat.in_polvio++;
                    898:                goto bad;
                    899:        }
                    900: #endif
1.173     jonathan  901: #if FAST_IPSEC
                    902:        /*
                    903:         * enforce IPsec policy checking if we are seeing last header.
                    904:         * note that we do not visit this with protocols with pcb layer
                    905:         * code - like udp/tcp/raw ip.
                    906:         */
                    907:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    908:                /*
                    909:                 * Check if the packet has already had IPsec processing
                    910:                 * done.  If so, then just pass it along.  This tag gets
                    911:                 * set during AH, ESP, etc. input handling, before the
                    912:                 * packet is returned to the ip input queue for delivery.
                    913:                 */
                    914:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    915:                s = splsoftnet();
                    916:                if (mtag != NULL) {
                    917:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    918:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    919:                } else {
                    920:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    921:                                                   IP_FORWARDING, &error);
                    922:                }
                    923:                if (sp != NULL) {
                    924:                        /*
                    925:                         * Check security policy against packet attributes.
                    926:                         */
                    927:                        error = ipsec_in_reject(sp, m);
                    928:                        KEY_FREESP(&sp);
                    929:                } else {
                    930:                        /* XXX error stat??? */
                    931:                        error = EINVAL;
                    932: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    933:                        goto bad;
                    934:                }
                    935:                splx(s);
                    936:                if (error)
                    937:                        goto bad;
                    938:        }
                    939: #endif /* FAST_IPSEC */
1.1       cgd       940:
                    941:        /*
                    942:         * Switch out to protocol's input routine.
                    943:         */
1.82      aidan     944: #if IFA_STATS
1.122     itojun    945:        if (ia && ip)
1.155     itojun    946:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     947: #endif
1.1       cgd       948:        ipstat.ips_delivered++;
1.89      itojun    949:     {
                    950:        int off = hlen, nh = ip->ip_p;
                    951:
                    952:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    953:        return;
                    954:     }
1.1       cgd       955: bad:
                    956:        m_freem(m);
1.135     thorpej   957:        return;
                    958:
                    959: badcsum:
                    960:        ipstat.ips_badsum++;
                    961:        m_freem(m);
1.1       cgd       962: }
                    963:
                    964: /*
                    965:  * Take incoming datagram fragment and try to
                    966:  * reassemble it into whole datagram.  If a chain for
                    967:  * reassembly of this datagram already exists, then it
                    968:  * is given as fp; otherwise have to make a chain.
                    969:  */
1.50      thorpej   970: struct mbuf *
1.25      cgd       971: ip_reass(ipqe, fp)
1.109     augustss  972:        struct ipqent *ipqe;
                    973:        struct ipq *fp;
1.1       cgd       974: {
1.109     augustss  975:        struct mbuf *m = ipqe->ipqe_m;
                    976:        struct ipqent *nq, *p, *q;
1.25      cgd       977:        struct ip *ip;
1.1       cgd       978:        struct mbuf *t;
1.25      cgd       979:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       980:        int i, next;
                    981:
1.75      thorpej   982:        IPQ_LOCK_CHECK();
                    983:
1.1       cgd       984:        /*
                    985:         * Presence of header sizes in mbufs
                    986:         * would confuse code below.
                    987:         */
                    988:        m->m_data += hlen;
                    989:        m->m_len -= hlen;
                    990:
                    991:        /*
                    992:         * If first fragment to arrive, create a reassembly queue.
                    993:         */
                    994:        if (fp == 0) {
1.131     itojun    995:                /*
                    996:                 * Enforce upper bound on number of fragmented packets
                    997:                 * for which we attempt reassembly;
                    998:                 * If maxfrag is 0, never accept fragments.
                    999:                 * If maxfrag is -1, accept all fragments without limitation.
                   1000:                 */
                   1001:                if (ip_maxfragpackets < 0)
                   1002:                        ;
                   1003:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1004:                        goto dropfrag;
                   1005:                ip_nfragpackets++;
1.50      thorpej  1006:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1007:                    M_FTABLE, M_NOWAIT);
                   1008:                if (fp == NULL)
1.1       cgd      1009:                        goto dropfrag;
1.25      cgd      1010:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd      1011:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1012:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1013:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1014:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1015:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1016:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1017:                p = NULL;
1.1       cgd      1018:                goto insert;
                   1019:        }
                   1020:
                   1021:        /*
                   1022:         * Find a segment which begins after this one does.
                   1023:         */
1.148     matt     1024:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1025:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1026:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1027:                        break;
                   1028:
                   1029:        /*
                   1030:         * If there is a preceding segment, it may provide some of
                   1031:         * our data already.  If so, drop the data from the incoming
                   1032:         * segment.  If it provides all of our data, drop us.
                   1033:         */
1.25      cgd      1034:        if (p != NULL) {
1.155     itojun   1035:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1036:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1037:                if (i > 0) {
1.155     itojun   1038:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1039:                                goto dropfrag;
1.50      thorpej  1040:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1041:                        ipqe->ipqe_ip->ip_off =
                   1042:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1043:                        ipqe->ipqe_ip->ip_len =
                   1044:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1045:                }
                   1046:        }
                   1047:
                   1048:        /*
                   1049:         * While we overlap succeeding segments trim them or,
                   1050:         * if they are completely covered, dequeue them.
                   1051:         */
1.155     itojun   1052:        for (; q != NULL &&
                   1053:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1054:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1055:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1056:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1057:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1058:                        q->ipqe_ip->ip_len =
                   1059:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1060:                        q->ipqe_ip->ip_off =
                   1061:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1062:                        m_adj(q->ipqe_m, i);
1.1       cgd      1063:                        break;
                   1064:                }
1.148     matt     1065:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1066:                m_freem(q->ipqe_m);
1.148     matt     1067:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1068:                pool_put(&ipqent_pool, q);
1.1       cgd      1069:        }
                   1070:
                   1071: insert:
                   1072:        /*
                   1073:         * Stick new segment in its place;
                   1074:         * check for complete reassembly.
                   1075:         */
1.25      cgd      1076:        if (p == NULL) {
1.148     matt     1077:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1078:        } else {
1.148     matt     1079:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1080:        }
1.1       cgd      1081:        next = 0;
1.148     matt     1082:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1083:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1084:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1085:                        return (0);
1.155     itojun   1086:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1087:        }
1.25      cgd      1088:        if (p->ipqe_mff)
1.1       cgd      1089:                return (0);
                   1090:
                   1091:        /*
1.41      thorpej  1092:         * Reassembly is complete.  Check for a bogus message size and
                   1093:         * concatenate fragments.
1.1       cgd      1094:         */
1.148     matt     1095:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1096:        ip = q->ipqe_ip;
1.41      thorpej  1097:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1098:                ipstat.ips_toolong++;
                   1099:                ip_freef(fp);
                   1100:                return (0);
                   1101:        }
1.50      thorpej  1102:        m = q->ipqe_m;
1.1       cgd      1103:        t = m->m_next;
                   1104:        m->m_next = 0;
                   1105:        m_cat(m, t);
1.148     matt     1106:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1107:        pool_put(&ipqent_pool, q);
1.25      cgd      1108:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1109:                t = q->ipqe_m;
1.148     matt     1110:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1111:                pool_put(&ipqent_pool, q);
1.1       cgd      1112:                m_cat(m, t);
                   1113:        }
                   1114:
                   1115:        /*
                   1116:         * Create header for new ip packet by
                   1117:         * modifying header of first packet;
                   1118:         * dequeue and discard fragment reassembly header.
                   1119:         * Make header visible.
                   1120:         */
1.155     itojun   1121:        ip->ip_len = htons(next);
1.25      cgd      1122:        ip->ip_src = fp->ipq_src;
                   1123:        ip->ip_dst = fp->ipq_dst;
                   1124:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1125:        FREE(fp, M_FTABLE);
1.131     itojun   1126:        ip_nfragpackets--;
1.1       cgd      1127:        m->m_len += (ip->ip_hl << 2);
                   1128:        m->m_data -= (ip->ip_hl << 2);
                   1129:        /* some debugging cruft by sklower, below, will go away soon */
                   1130:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1131:                int plen = 0;
1.50      thorpej  1132:                for (t = m; t; t = t->m_next)
                   1133:                        plen += t->m_len;
                   1134:                m->m_pkthdr.len = plen;
1.1       cgd      1135:        }
1.50      thorpej  1136:        return (m);
1.1       cgd      1137:
                   1138: dropfrag:
                   1139:        ipstat.ips_fragdropped++;
                   1140:        m_freem(m);
1.72      thorpej  1141:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1142:        return (0);
                   1143: }
                   1144:
                   1145: /*
                   1146:  * Free a fragment reassembly header and all
                   1147:  * associated datagrams.
                   1148:  */
1.8       mycroft  1149: void
1.1       cgd      1150: ip_freef(fp)
                   1151:        struct ipq *fp;
                   1152: {
1.109     augustss 1153:        struct ipqent *q, *p;
1.1       cgd      1154:
1.75      thorpej  1155:        IPQ_LOCK_CHECK();
                   1156:
1.148     matt     1157:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1158:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1159:                m_freem(q->ipqe_m);
1.148     matt     1160:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1161:                pool_put(&ipqent_pool, q);
1.1       cgd      1162:        }
1.25      cgd      1163:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1164:        FREE(fp, M_FTABLE);
1.131     itojun   1165:        ip_nfragpackets--;
1.1       cgd      1166: }
                   1167:
                   1168: /*
                   1169:  * IP timer processing;
                   1170:  * if a timer expires on a reassembly
                   1171:  * queue, discard it.
                   1172:  */
1.8       mycroft  1173: void
1.1       cgd      1174: ip_slowtimo()
                   1175: {
1.109     augustss 1176:        struct ipq *fp, *nfp;
1.24      mycroft  1177:        int s = splsoftnet();
1.1       cgd      1178:
1.75      thorpej  1179:        IPQ_LOCK();
1.140     matt     1180:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1181:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1182:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1183:                        ipstat.ips_fragtimeout++;
1.25      cgd      1184:                        ip_freef(fp);
1.1       cgd      1185:                }
                   1186:        }
1.131     itojun   1187:        /*
                   1188:         * If we are over the maximum number of fragments
                   1189:         * (due to the limit being lowered), drain off
                   1190:         * enough to get down to the new limit.
                   1191:         */
                   1192:        if (ip_maxfragpackets < 0)
                   1193:                ;
                   1194:        else {
1.140     matt     1195:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1196:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1197:        }
1.75      thorpej  1198:        IPQ_UNLOCK();
1.63      matt     1199: #ifdef GATEWAY
                   1200:        ipflow_slowtimo();
                   1201: #endif
1.1       cgd      1202:        splx(s);
                   1203: }
                   1204:
                   1205: /*
                   1206:  * Drain off all datagram fragments.
                   1207:  */
1.8       mycroft  1208: void
1.1       cgd      1209: ip_drain()
                   1210: {
                   1211:
1.75      thorpej  1212:        /*
                   1213:         * We may be called from a device's interrupt context.  If
                   1214:         * the ipq is already busy, just bail out now.
                   1215:         */
                   1216:        if (ipq_lock_try() == 0)
                   1217:                return;
                   1218:
1.140     matt     1219:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1220:                ipstat.ips_fragdropped++;
1.140     matt     1221:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1222:        }
1.75      thorpej  1223:
                   1224:        IPQ_UNLOCK();
1.1       cgd      1225: }
                   1226:
                   1227: /*
                   1228:  * Do option processing on a datagram,
                   1229:  * possibly discarding it if bad options are encountered,
                   1230:  * or forwarding it if source-routed.
                   1231:  * Returns 1 if packet has been forwarded/freed,
                   1232:  * 0 if the packet should be processed further.
                   1233:  */
1.8       mycroft  1234: int
1.1       cgd      1235: ip_dooptions(m)
                   1236:        struct mbuf *m;
                   1237: {
1.109     augustss 1238:        struct ip *ip = mtod(m, struct ip *);
                   1239:        u_char *cp, *cp0;
                   1240:        struct ip_timestamp *ipt;
                   1241:        struct in_ifaddr *ia;
1.1       cgd      1242:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1243:        struct in_addr dst;
1.1       cgd      1244:        n_time ntime;
                   1245:
1.13      mycroft  1246:        dst = ip->ip_dst;
1.1       cgd      1247:        cp = (u_char *)(ip + 1);
                   1248:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1249:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1250:                opt = cp[IPOPT_OPTVAL];
                   1251:                if (opt == IPOPT_EOL)
                   1252:                        break;
                   1253:                if (opt == IPOPT_NOP)
                   1254:                        optlen = 1;
                   1255:                else {
1.113     itojun   1256:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1257:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1258:                                goto bad;
                   1259:                        }
1.1       cgd      1260:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1261:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1262:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1263:                                goto bad;
                   1264:                        }
                   1265:                }
                   1266:                switch (opt) {
                   1267:
                   1268:                default:
                   1269:                        break;
                   1270:
                   1271:                /*
                   1272:                 * Source routing with record.
                   1273:                 * Find interface with current destination address.
                   1274:                 * If none on this machine then drop if strictly routed,
                   1275:                 * or do nothing if loosely routed.
                   1276:                 * Record interface address and bring up next address
                   1277:                 * component.  If strictly routed make sure next
                   1278:                 * address is on directly accessible net.
                   1279:                 */
                   1280:                case IPOPT_LSRR:
                   1281:                case IPOPT_SSRR:
1.47      cjs      1282:                        if (ip_allowsrcrt == 0) {
                   1283:                                type = ICMP_UNREACH;
                   1284:                                code = ICMP_UNREACH_NET_PROHIB;
                   1285:                                goto bad;
                   1286:                        }
1.114     itojun   1287:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1288:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1289:                                goto bad;
                   1290:                        }
1.1       cgd      1291:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1292:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1293:                                goto bad;
                   1294:                        }
                   1295:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1296:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1297:                        if (ia == 0) {
                   1298:                                if (opt == IPOPT_SSRR) {
                   1299:                                        type = ICMP_UNREACH;
                   1300:                                        code = ICMP_UNREACH_SRCFAIL;
                   1301:                                        goto bad;
                   1302:                                }
                   1303:                                /*
                   1304:                                 * Loose routing, and not at next destination
                   1305:                                 * yet; nothing to do except forward.
                   1306:                                 */
                   1307:                                break;
                   1308:                        }
                   1309:                        off--;                  /* 0 origin */
1.112     sommerfe 1310:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1311:                                /*
                   1312:                                 * End of source route.  Should be for us.
                   1313:                                 */
                   1314:                                save_rte(cp, ip->ip_src);
                   1315:                                break;
                   1316:                        }
                   1317:                        /*
                   1318:                         * locate outgoing interface
                   1319:                         */
                   1320:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1321:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1322:                        if (opt == IPOPT_SSRR)
                   1323:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1324:                        else
1.1       cgd      1325:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1326:                        if (ia == 0) {
                   1327:                                type = ICMP_UNREACH;
                   1328:                                code = ICMP_UNREACH_SRCFAIL;
                   1329:                                goto bad;
                   1330:                        }
                   1331:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1332:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1333:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1334:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1335:                        /*
                   1336:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1337:                         */
1.18      mycroft  1338:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1339:                        break;
                   1340:
                   1341:                case IPOPT_RR:
1.114     itojun   1342:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1343:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1344:                                goto bad;
                   1345:                        }
1.1       cgd      1346:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1347:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1348:                                goto bad;
                   1349:                        }
                   1350:                        /*
                   1351:                         * If no space remains, ignore.
                   1352:                         */
                   1353:                        off--;                  /* 0 origin */
1.112     sommerfe 1354:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1355:                                break;
                   1356:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1357:                            sizeof(ipaddr.sin_addr));
                   1358:                        /*
                   1359:                         * locate outgoing interface; if we're the destination,
                   1360:                         * use the incoming interface (should be same).
                   1361:                         */
1.96      thorpej  1362:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1363:                            == NULL &&
                   1364:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1365:                                type = ICMP_UNREACH;
                   1366:                                code = ICMP_UNREACH_HOST;
                   1367:                                goto bad;
                   1368:                        }
1.20      mycroft  1369:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1370:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1371:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1372:                        break;
                   1373:
                   1374:                case IPOPT_TS:
                   1375:                        code = cp - (u_char *)ip;
                   1376:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1377:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1378:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1379:                                goto bad;
1.114     itojun   1380:                        }
                   1381:                        if (ipt->ipt_ptr < 5) {
                   1382:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1383:                                goto bad;
                   1384:                        }
1.15      cgd      1385:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1386:                                if (++ipt->ipt_oflw == 0) {
                   1387:                                        code = (u_char *)&ipt->ipt_ptr -
                   1388:                                            (u_char *)ip;
1.1       cgd      1389:                                        goto bad;
1.114     itojun   1390:                                }
1.1       cgd      1391:                                break;
                   1392:                        }
1.104     thorpej  1393:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1394:                        switch (ipt->ipt_flg) {
                   1395:
                   1396:                        case IPOPT_TS_TSONLY:
                   1397:                                break;
                   1398:
                   1399:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1400:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1401:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1402:                                        code = (u_char *)&ipt->ipt_ptr -
                   1403:                                            (u_char *)ip;
1.1       cgd      1404:                                        goto bad;
1.114     itojun   1405:                                }
1.13      mycroft  1406:                                ipaddr.sin_addr = dst;
1.96      thorpej  1407:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1408:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1409:                                if (ia == 0)
                   1410:                                        continue;
1.104     thorpej  1411:                                bcopy(&ia->ia_addr.sin_addr,
                   1412:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1413:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1414:                                break;
                   1415:
                   1416:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1417:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1418:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1419:                                        code = (u_char *)&ipt->ipt_ptr -
                   1420:                                            (u_char *)ip;
1.1       cgd      1421:                                        goto bad;
1.114     itojun   1422:                                }
1.104     thorpej  1423:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1424:                                    sizeof(struct in_addr));
1.96      thorpej  1425:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1426:                                    == NULL)
1.1       cgd      1427:                                        continue;
                   1428:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1429:                                break;
                   1430:
                   1431:                        default:
1.114     itojun   1432:                                /* XXX can't take &ipt->ipt_flg */
                   1433:                                code = (u_char *)&ipt->ipt_ptr -
                   1434:                                    (u_char *)ip + 1;
1.1       cgd      1435:                                goto bad;
                   1436:                        }
                   1437:                        ntime = iptime();
1.107     thorpej  1438:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1439:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1440:                            sizeof(n_time));
                   1441:                        ipt->ipt_ptr += sizeof(n_time);
                   1442:                }
                   1443:        }
                   1444:        if (forward) {
1.26      thorpej  1445:                if (ip_forwsrcrt == 0) {
                   1446:                        type = ICMP_UNREACH;
                   1447:                        code = ICMP_UNREACH_SRCFAIL;
                   1448:                        goto bad;
                   1449:                }
1.1       cgd      1450:                ip_forward(m, 1);
                   1451:                return (1);
1.13      mycroft  1452:        }
                   1453:        return (0);
1.1       cgd      1454: bad:
1.13      mycroft  1455:        icmp_error(m, type, code, 0, 0);
                   1456:        ipstat.ips_badoptions++;
1.1       cgd      1457:        return (1);
                   1458: }
                   1459:
                   1460: /*
                   1461:  * Given address of next destination (final or next hop),
                   1462:  * return internet address info of interface to be used to get there.
                   1463:  */
                   1464: struct in_ifaddr *
                   1465: ip_rtaddr(dst)
                   1466:         struct in_addr dst;
                   1467: {
1.109     augustss 1468:        struct sockaddr_in *sin;
1.1       cgd      1469:
1.19      mycroft  1470:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1471:
1.35      mycroft  1472:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1473:                if (ipforward_rt.ro_rt) {
                   1474:                        RTFREE(ipforward_rt.ro_rt);
                   1475:                        ipforward_rt.ro_rt = 0;
                   1476:                }
                   1477:                sin->sin_family = AF_INET;
                   1478:                sin->sin_len = sizeof(*sin);
                   1479:                sin->sin_addr = dst;
                   1480:
                   1481:                rtalloc(&ipforward_rt);
                   1482:        }
                   1483:        if (ipforward_rt.ro_rt == 0)
                   1484:                return ((struct in_ifaddr *)0);
1.19      mycroft  1485:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1486: }
                   1487:
                   1488: /*
                   1489:  * Save incoming source route for use in replies,
                   1490:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1491:  */
1.13      mycroft  1492: void
1.1       cgd      1493: save_rte(option, dst)
                   1494:        u_char *option;
                   1495:        struct in_addr dst;
                   1496: {
                   1497:        unsigned olen;
                   1498:
                   1499:        olen = option[IPOPT_OLEN];
                   1500: #ifdef DIAGNOSTIC
                   1501:        if (ipprintfs)
1.39      christos 1502:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1503: #endif /* 0 */
1.1       cgd      1504:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1505:                return;
                   1506:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1507:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1508:        ip_srcrt.dst = dst;
                   1509: }
                   1510:
                   1511: /*
                   1512:  * Retrieve incoming source route for use in replies,
                   1513:  * in the same form used by setsockopt.
                   1514:  * The first hop is placed before the options, will be removed later.
                   1515:  */
                   1516: struct mbuf *
                   1517: ip_srcroute()
                   1518: {
1.109     augustss 1519:        struct in_addr *p, *q;
                   1520:        struct mbuf *m;
1.1       cgd      1521:
                   1522:        if (ip_nhops == 0)
                   1523:                return ((struct mbuf *)0);
                   1524:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1525:        if (m == 0)
                   1526:                return ((struct mbuf *)0);
                   1527:
1.164     matt     1528:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1529: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1530:
                   1531:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1532:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1533:            OPTSIZ;
                   1534: #ifdef DIAGNOSTIC
                   1535:        if (ipprintfs)
1.39      christos 1536:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1537: #endif
                   1538:
                   1539:        /*
                   1540:         * First save first hop for return route
                   1541:         */
                   1542:        p = &ip_srcrt.route[ip_nhops - 1];
                   1543:        *(mtod(m, struct in_addr *)) = *p--;
                   1544: #ifdef DIAGNOSTIC
                   1545:        if (ipprintfs)
1.39      christos 1546:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1547: #endif
                   1548:
                   1549:        /*
                   1550:         * Copy option fields and padding (nop) to mbuf.
                   1551:         */
                   1552:        ip_srcrt.nop = IPOPT_NOP;
                   1553:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1554:        bcopy((caddr_t)&ip_srcrt.nop,
                   1555:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1556:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1557:            sizeof(struct in_addr) + OPTSIZ);
                   1558: #undef OPTSIZ
                   1559:        /*
                   1560:         * Record return path as an IP source route,
                   1561:         * reversing the path (pointers are now aligned).
                   1562:         */
                   1563:        while (p >= ip_srcrt.route) {
                   1564: #ifdef DIAGNOSTIC
                   1565:                if (ipprintfs)
1.39      christos 1566:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1567: #endif
                   1568:                *q++ = *p--;
                   1569:        }
                   1570:        /*
                   1571:         * Last hop goes to final destination.
                   1572:         */
                   1573:        *q = ip_srcrt.dst;
                   1574: #ifdef DIAGNOSTIC
                   1575:        if (ipprintfs)
1.39      christos 1576:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1577: #endif
                   1578:        return (m);
                   1579: }
                   1580:
                   1581: /*
                   1582:  * Strip out IP options, at higher
                   1583:  * level protocol in the kernel.
                   1584:  * Second argument is buffer to which options
                   1585:  * will be moved, and return value is their length.
                   1586:  * XXX should be deleted; last arg currently ignored.
                   1587:  */
1.8       mycroft  1588: void
1.1       cgd      1589: ip_stripoptions(m, mopt)
1.109     augustss 1590:        struct mbuf *m;
1.1       cgd      1591:        struct mbuf *mopt;
                   1592: {
1.109     augustss 1593:        int i;
1.1       cgd      1594:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1595:        caddr_t opts;
1.1       cgd      1596:        int olen;
                   1597:
1.79      mycroft  1598:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1599:        opts = (caddr_t)(ip + 1);
                   1600:        i = m->m_len - (sizeof (struct ip) + olen);
                   1601:        bcopy(opts  + olen, opts, (unsigned)i);
                   1602:        m->m_len -= olen;
                   1603:        if (m->m_flags & M_PKTHDR)
                   1604:                m->m_pkthdr.len -= olen;
1.155     itojun   1605:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1606:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1607: }
                   1608:
1.139     matt     1609: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1610:        0,              0,              0,              0,
                   1611:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1612:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1613:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1614:        0,              0,              0,              0,
                   1615:        ENOPROTOOPT
                   1616: };
                   1617:
                   1618: /*
                   1619:  * Forward a packet.  If some error occurs return the sender
                   1620:  * an icmp packet.  Note we can't always generate a meaningful
                   1621:  * icmp message because icmp doesn't have a large enough repertoire
                   1622:  * of codes and types.
                   1623:  *
                   1624:  * If not forwarding, just drop the packet.  This could be confusing
                   1625:  * if ipforwarding was zero but some routing protocol was advancing
                   1626:  * us as a gateway to somewhere.  However, we must let the routing
                   1627:  * protocol deal with that.
                   1628:  *
                   1629:  * The srcrt parameter indicates whether the packet is being forwarded
                   1630:  * via a source route.
                   1631:  */
1.13      mycroft  1632: void
1.1       cgd      1633: ip_forward(m, srcrt)
                   1634:        struct mbuf *m;
                   1635:        int srcrt;
                   1636: {
1.109     augustss 1637:        struct ip *ip = mtod(m, struct ip *);
                   1638:        struct sockaddr_in *sin;
                   1639:        struct rtentry *rt;
1.28      christos 1640:        int error, type = 0, code = 0;
1.1       cgd      1641:        struct mbuf *mcopy;
1.13      mycroft  1642:        n_long dest;
                   1643:        struct ifnet *destifp;
1.173     jonathan 1644: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1645:        struct ifnet dummyifp;
                   1646: #endif
1.164     matt     1647:
                   1648:        /*
                   1649:         * We are now in the output path.
                   1650:         */
                   1651:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1652:
                   1653:        /*
                   1654:         * Clear any in-bound checksum flags for this packet.
                   1655:         */
                   1656:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1657:
1.13      mycroft  1658:        dest = 0;
1.1       cgd      1659: #ifdef DIAGNOSTIC
                   1660:        if (ipprintfs)
1.70      thorpej  1661:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1662:                    ntohl(ip->ip_src.s_addr),
                   1663:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1664: #endif
1.93      sommerfe 1665:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1666:                ipstat.ips_cantforward++;
                   1667:                m_freem(m);
                   1668:                return;
                   1669:        }
                   1670:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1671:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1672:                return;
                   1673:        }
                   1674:        ip->ip_ttl -= IPTTLDEC;
                   1675:
1.19      mycroft  1676:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1677:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1678:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1679:                if (ipforward_rt.ro_rt) {
                   1680:                        RTFREE(ipforward_rt.ro_rt);
                   1681:                        ipforward_rt.ro_rt = 0;
                   1682:                }
                   1683:                sin->sin_family = AF_INET;
1.35      mycroft  1684:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1685:                sin->sin_addr = ip->ip_dst;
                   1686:
                   1687:                rtalloc(&ipforward_rt);
                   1688:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1689:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1690:                        return;
                   1691:                }
                   1692:                rt = ipforward_rt.ro_rt;
                   1693:        }
                   1694:
                   1695:        /*
1.34      mycroft  1696:         * Save at most 68 bytes of the packet in case
1.1       cgd      1697:         * we need to generate an ICMP message to the src.
1.119     itojun   1698:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1699:         */
1.155     itojun   1700:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1701:        if (mcopy)
                   1702:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1703:
                   1704:        /*
                   1705:         * If forwarding packet using same interface that it came in on,
                   1706:         * perhaps should send a redirect to sender to shortcut a hop.
                   1707:         * Only send redirect if source is sending directly to us,
                   1708:         * and if packet was not source routed (or has any options).
                   1709:         * Also, don't send redirect if forwarding using a default route
                   1710:         * or a route modified by a redirect.
                   1711:         */
                   1712:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1713:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1714:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1715:            ipsendredirects && !srcrt) {
1.19      mycroft  1716:                if (rt->rt_ifa &&
                   1717:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1718:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1719:                        if (rt->rt_flags & RTF_GATEWAY)
                   1720:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1721:                        else
                   1722:                                dest = ip->ip_dst.s_addr;
                   1723:                        /*
                   1724:                         * Router requirements says to only send host
                   1725:                         * redirects.
                   1726:                         */
                   1727:                        type = ICMP_REDIRECT;
                   1728:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1729: #ifdef DIAGNOSTIC
1.77      thorpej  1730:                        if (ipprintfs)
                   1731:                                printf("redirect (%d) to %x\n", code,
                   1732:                                    (u_int32_t)dest);
1.1       cgd      1733: #endif
                   1734:                }
                   1735:        }
                   1736:
1.27      thorpej  1737:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1738:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1739:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1740:
1.1       cgd      1741:        if (error)
                   1742:                ipstat.ips_cantforward++;
                   1743:        else {
                   1744:                ipstat.ips_forward++;
                   1745:                if (type)
                   1746:                        ipstat.ips_redirectsent++;
                   1747:                else {
1.63      matt     1748:                        if (mcopy) {
                   1749: #ifdef GATEWAY
1.64      thorpej  1750:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1751:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1752: #endif
1.1       cgd      1753:                                m_freem(mcopy);
1.63      matt     1754:                        }
1.1       cgd      1755:                        return;
                   1756:                }
                   1757:        }
                   1758:        if (mcopy == NULL)
                   1759:                return;
1.13      mycroft  1760:        destifp = NULL;
                   1761:
1.1       cgd      1762:        switch (error) {
                   1763:
                   1764:        case 0:                         /* forwarded, but need redirect */
                   1765:                /* type, code set above */
                   1766:                break;
                   1767:
                   1768:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1769:        case EHOSTUNREACH:
                   1770:        case ENETDOWN:
                   1771:        case EHOSTDOWN:
                   1772:        default:
                   1773:                type = ICMP_UNREACH;
                   1774:                code = ICMP_UNREACH_HOST;
                   1775:                break;
                   1776:
                   1777:        case EMSGSIZE:
                   1778:                type = ICMP_UNREACH;
                   1779:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1780: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1781:                if (ipforward_rt.ro_rt)
                   1782:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1783: #else
                   1784:                /*
                   1785:                 * If the packet is routed over IPsec tunnel, tell the
                   1786:                 * originator the tunnel MTU.
                   1787:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1788:                 * XXX quickhack!!!
                   1789:                 */
                   1790:                if (ipforward_rt.ro_rt) {
                   1791:                        struct secpolicy *sp;
                   1792:                        int ipsecerror;
1.95      itojun   1793:                        size_t ipsechdr;
1.89      itojun   1794:                        struct route *ro;
                   1795:
                   1796:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1797:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1798:                            &ipsecerror);
1.89      itojun   1799:
                   1800:                        if (sp == NULL)
                   1801:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1802:                        else {
                   1803:                                /* count IPsec header size */
1.95      itojun   1804:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1805:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1806:
                   1807:                                /*
                   1808:                                 * find the correct route for outer IPv4
                   1809:                                 * header, compute tunnel MTU.
                   1810:                                 *
                   1811:                                 * XXX BUG ALERT
                   1812:                                 * The "dummyifp" code relies upon the fact
                   1813:                                 * that icmp_error() touches only ifp->if_mtu.
                   1814:                                 */
                   1815:                                /*XXX*/
                   1816:                                destifp = NULL;
                   1817:                                if (sp->req != NULL
1.95      itojun   1818:                                 && sp->req->sav != NULL
                   1819:                                 && sp->req->sav->sah != NULL) {
                   1820:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1821:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1822:                                                dummyifp.if_mtu =
1.151     itojun   1823:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1824:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1825:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1826:                                                dummyifp.if_mtu -= ipsechdr;
                   1827:                                                destifp = &dummyifp;
                   1828:                                        }
                   1829:                                }
                   1830:
1.173     jonathan 1831: #ifdef IPSEC
1.89      itojun   1832:                                key_freesp(sp);
1.173     jonathan 1833: #else
                   1834:                                KEY_FREESP(&sp);
                   1835: #endif
1.89      itojun   1836:                        }
                   1837:                }
                   1838: #endif /*IPSEC*/
1.1       cgd      1839:                ipstat.ips_cantfrag++;
                   1840:                break;
                   1841:
                   1842:        case ENOBUFS:
1.143     itojun   1843: #if 1
                   1844:                /*
                   1845:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1846:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1847:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1848:                 * or if the underlying interface is rate-limited.
1.143     itojun   1849:                 */
                   1850:                if (mcopy)
                   1851:                        m_freem(mcopy);
                   1852:                return;
                   1853: #else
1.1       cgd      1854:                type = ICMP_SOURCEQUENCH;
                   1855:                code = 0;
                   1856:                break;
1.143     itojun   1857: #endif
1.1       cgd      1858:        }
1.13      mycroft  1859:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1860: }
                   1861:
                   1862: void
                   1863: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1864:        struct inpcb *inp;
                   1865:        struct mbuf **mp;
                   1866:        struct ip *ip;
                   1867:        struct mbuf *m;
1.44      thorpej  1868: {
                   1869:
                   1870:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1871:                struct timeval tv;
                   1872:
                   1873:                microtime(&tv);
                   1874:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1875:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1876:                if (*mp)
                   1877:                        mp = &(*mp)->m_next;
                   1878:        }
                   1879:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1880:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1881:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1882:                if (*mp)
                   1883:                        mp = &(*mp)->m_next;
                   1884:        }
                   1885: #ifdef notyet
                   1886:        /*
                   1887:         * XXX
                   1888:         * Moving these out of udp_input() made them even more broken
                   1889:         * than they already were.
                   1890:         *      - fenner@parc.xerox.com
                   1891:         */
                   1892:        /* options were tossed already */
                   1893:        if (inp->inp_flags & INP_RECVOPTS) {
                   1894:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1895:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1896:                if (*mp)
                   1897:                        mp = &(*mp)->m_next;
                   1898:        }
                   1899:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1900:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1901:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1902:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1903:                if (*mp)
                   1904:                        mp = &(*mp)->m_next;
                   1905:        }
                   1906: #endif
                   1907:        if (inp->inp_flags & INP_RECVIF) {
                   1908:                struct sockaddr_dl sdl;
                   1909:
                   1910:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1911:                sdl.sdl_family = AF_LINK;
                   1912:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1913:                    m->m_pkthdr.rcvif->if_index : 0;
                   1914:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1915:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1916:                    IP_RECVIF, IPPROTO_IP);
                   1917:                if (*mp)
                   1918:                        mp = &(*mp)->m_next;
                   1919:        }
1.13      mycroft  1920: }
                   1921:
                   1922: int
                   1923: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1924:        int *name;
                   1925:        u_int namelen;
                   1926:        void *oldp;
                   1927:        size_t *oldlenp;
                   1928:        void *newp;
                   1929:        size_t newlen;
                   1930: {
1.88      sommerfe 1931:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1932:
1.54      lukem    1933:        int error, old;
                   1934:
1.180     jonathan 1935:        /* All sysctl names (except ifq.*) at this level are terminal. */
                   1936:        if ((namelen != 1) && !(namelen == 2 && name[0] == IPCTL_IFQ))
                   1937:                return (ENOTDIR);
1.13      mycroft  1938:
                   1939:        switch (name[0]) {
                   1940:        case IPCTL_FORWARDING:
                   1941:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1942:        case IPCTL_SENDREDIRECTS:
                   1943:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1944:                        &ipsendredirects));
                   1945:        case IPCTL_DEFTTL:
                   1946:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1947: #ifdef notyet
                   1948:        case IPCTL_DEFMTU:
                   1949:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1950: #endif
1.26      thorpej  1951:        case IPCTL_FORWSRCRT:
1.47      cjs      1952:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1953:                if (securelevel > 0)
1.46      cjs      1954:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1955:                            ip_forwsrcrt));
                   1956:                else
                   1957:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1958:                            &ip_forwsrcrt));
1.27      thorpej  1959:        case IPCTL_DIRECTEDBCAST:
                   1960:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1961:                    &ip_directedbcast));
1.47      cjs      1962:        case IPCTL_ALLOWSRCRT:
                   1963:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1964:                    &ip_allowsrcrt));
1.52      thorpej  1965:        case IPCTL_SUBNETSARELOCAL:
                   1966:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1967:                    &subnetsarelocal));
1.53      kml      1968:        case IPCTL_MTUDISC:
1.60      kml      1969:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1970:                    &ip_mtudisc);
1.163     itojun   1971:                if (error == 0 && ip_mtudisc == 0)
                   1972:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1973:                return error;
1.54      lukem    1974:        case IPCTL_ANONPORTMIN:
                   1975:                old = anonportmin;
                   1976:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1977:                if (anonportmin >= anonportmax || anonportmin < 0
                   1978:                    || anonportmin > 65535
1.54      lukem    1979: #ifndef IPNOPRIVPORTS
                   1980:                    || anonportmin < IPPORT_RESERVED
                   1981: #endif
                   1982:                    ) {
                   1983:                        anonportmin = old;
                   1984:                        return (EINVAL);
                   1985:                }
                   1986:                return (error);
                   1987:        case IPCTL_ANONPORTMAX:
                   1988:                old = anonportmax;
                   1989:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1990:                if (anonportmin >= anonportmax || anonportmax < 0
                   1991:                    || anonportmax > 65535
1.54      lukem    1992: #ifndef IPNOPRIVPORTS
                   1993:                    || anonportmax < IPPORT_RESERVED
                   1994: #endif
                   1995:                    ) {
                   1996:                        anonportmax = old;
                   1997:                        return (EINVAL);
                   1998:                }
1.60      kml      1999:                return (error);
                   2000:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   2001:                old = ip_mtudisc_timeout;
1.60      kml      2002:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   2003:                   &ip_mtudisc_timeout);
1.158     itojun   2004:                if (ip_mtudisc_timeout < 0) {
                   2005:                        ip_mtudisc_timeout = old;
1.156     itojun   2006:                        return (EINVAL);
1.158     itojun   2007:                }
1.163     itojun   2008:                if (error == 0)
1.162     itojun   2009:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   2010:                                              ip_mtudisc_timeout);
1.54      lukem    2011:                return (error);
1.65      matt     2012: #ifdef GATEWAY
                   2013:        case IPCTL_MAXFLOWS:
1.67      thorpej  2014:            {
                   2015:                int s;
                   2016:
1.65      matt     2017:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   2018:                   &ip_maxflows);
1.67      thorpej  2019:                s = splsoftnet();
1.65      matt     2020:                ipflow_reap(0);
1.67      thorpej  2021:                splx(s);
1.65      matt     2022:                return (error);
1.67      thorpej  2023:            }
1.89      itojun   2024: #endif
1.90      itojun   2025:        case IPCTL_HOSTZEROBROADCAST:
                   2026:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2027:                    &hostzeroisbroadcast));
1.89      itojun   2028: #if NGIF > 0
                   2029:        case IPCTL_GIF_TTL:
1.157     itojun   2030:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   2031:                                  &ip_gif_ttl));
1.144     martin   2032: #endif
                   2033:
                   2034: #if NGRE > 0
                   2035:        case IPCTL_GRE_TTL:
1.157     itojun   2036:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   2037:                                  &ip_gre_ttl));
1.117     tron     2038: #endif
                   2039:
                   2040: #ifndef IPNOPRIVPORTS
                   2041:        case IPCTL_LOWPORTMIN:
                   2042:                old = lowportmin;
                   2043:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   2044:                if (lowportmin >= lowportmax
                   2045:                    || lowportmin > IPPORT_RESERVEDMAX
                   2046:                    || lowportmin < IPPORT_RESERVEDMIN
                   2047:                    ) {
                   2048:                        lowportmin = old;
                   2049:                        return (EINVAL);
                   2050:                }
                   2051:                return (error);
                   2052:        case IPCTL_LOWPORTMAX:
                   2053:                old = lowportmax;
                   2054:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   2055:                if (lowportmin >= lowportmax
                   2056:                    || lowportmax > IPPORT_RESERVEDMAX
                   2057:                    || lowportmax < IPPORT_RESERVEDMIN
                   2058:                    ) {
                   2059:                        lowportmax = old;
                   2060:                        return (EINVAL);
                   2061:                }
                   2062:                return (error);
1.65      matt     2063: #endif
1.131     itojun   2064:
                   2065:        case IPCTL_MAXFRAGPACKETS:
                   2066:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2067:                    &ip_maxfragpackets));
1.88      sommerfe 2068:
1.165     christos 2069:        case IPCTL_CHECKINTERFACE:
                   2070:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2071:                    &ip_checkinterface));
1.182     itojun   2072:
1.180     jonathan 2073:        case IPCTL_IFQ:
1.182     itojun   2074:                return (sysctl_ifq(name + 1, namelen - 1, oldp, oldlenp,
                   2075:                    newp, newlen, &ipintrq));
1.184     jonathan 2076:
                   2077:        case IPCTL_RANDOMID:
                   2078: #ifdef RANDOM_IP_ID
                   2079:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2080:                    &ip_do_randomid));
                   2081: #else
1.185     fvdl     2082:                return (sysctl_rdint(oldp, oldlenp, newp, 0));
1.184     jonathan 2083: #endif
1.180     jonathan 2084:
1.13      mycroft  2085:        default:
                   2086:                return (EOPNOTSUPP);
                   2087:        }
                   2088:        /* NOTREACHED */
1.1       cgd      2089: }

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