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Annotation of src/sys/netinet/ip_input.c, Revision 1.197.2.1

1.197.2.1! tron        1: /*     $NetBSD$        */
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>
1.197.2.1! tron      101: __KERNEL_RCSID(0, "$NetBSD$");
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: int    ip_do_randomid = 0;
                    203:
1.165     christos  204: /*
                    205:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    206:  * the Strong ES model described in RFC 1122, but since the routing table
                    207:  * and transmit implementation do not implement the Strong ES model,
                    208:  * setting this to 1 results in an odd hybrid.
                    209:  *
                    210:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    211:  * to translate the destination address to another local interface.
                    212:  *
                    213:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    214:  * to the loopback interface instead of the interface where the
                    215:  * packets for those addresses are received.
                    216:  */
                    217: int    ip_checkinterface = 0;
                    218:
1.1       cgd       219:
1.60      kml       220: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    221:
1.1       cgd       222: extern struct domain inetdomain;
                    223: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      224: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    225: int    in_ifaddrentries;                       /* total number of addrs */
1.181     jonathan  226: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       227: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      228: u_long in_multihash;                           /* size of hash table - 1 */
                    229: int    in_multientries;                        /* total number of addrs */
                    230: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   231: struct ifqueue ipintrq;
1.63      matt      232: struct ipstat  ipstat;
1.183     jonathan  233: uint16_t ip_id;
1.75      thorpej   234:
1.121     thorpej   235: #ifdef PFIL_HOOKS
                    236: struct pfil_head inet_pfil_hook;
                    237: #endif
                    238:
1.194     jonathan  239: /*
                    240:  * Cached copy of nmbclusters. If nbclusters is different,
                    241:  * recalculate IP parameters derived from nmbclusters.
                    242:  */
                    243: static int     ip_nmbclusters;                 /* copy of nmbclusters */
                    244: static void    ip_nmbclusters_changed __P((void));     /* recalc limits */
                    245:
1.195     thorpej   246: #define CHECK_NMBCLUSTER_PARAMS()                              \
                    247: do {                                                           \
                    248:        if (__predict_false(ip_nmbclusters != nmbclusters))     \
                    249:                ip_nmbclusters_changed();                       \
                    250: } while (/*CONSTCOND*/0)
1.194     jonathan  251:
1.190     jonathan  252: /* IP datagram reassembly queues (hashed) */
                    253: #define IPREASS_NHASH_LOG2      6
                    254: #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
                    255: #define IPREASS_HMASK           (IPREASS_NHASH - 1)
                    256: #define IPREASS_HASH(x,y) \
                    257:        (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
                    258: struct ipqhead ipq[IPREASS_NHASH];
1.75      thorpej   259: int    ipq_locked;
1.194     jonathan  260: static int     ip_nfragpackets;        /* packets in reass queue */
                    261: static int     ip_nfrags;              /* total fragments in reass queues */
                    262:
                    263: int    ip_maxfragpackets = 200;        /* limit on packets. XXX sysctl */
                    264: int    ip_maxfrags;                    /* limit on fragments. XXX sysctl */
                    265:
                    266:
                    267: /*
                    268:  * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
                    269:  * IP reassembly queue buffer managment.
                    270:  *
                    271:  * We keep a count of total IP fragments (NB: not fragmented packets!)
                    272:  * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
                    273:  * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
                    274:  * total fragments in  reassembly queues.This AIMD policy avoids
                    275:  * repeatedly deleting single packets under heavy fragmentation load
                    276:  * (e.g., from lossy NFS peers).
                    277:  */
                    278: static u_int   ip_reass_ttl_decr __P((u_int ticks));
                    279: static void    ip_reass_drophalf __P((void));
                    280:
1.75      thorpej   281:
                    282: static __inline int ipq_lock_try __P((void));
                    283: static __inline void ipq_unlock __P((void));
                    284:
                    285: static __inline int
                    286: ipq_lock_try()
                    287: {
                    288:        int s;
                    289:
1.132     thorpej   290:        /*
1.149     wiz       291:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   292:         * mbuf allocation.
                    293:         */
                    294:        s = splvm();
1.75      thorpej   295:        if (ipq_locked) {
                    296:                splx(s);
                    297:                return (0);
                    298:        }
                    299:        ipq_locked = 1;
                    300:        splx(s);
                    301:        return (1);
                    302: }
                    303:
                    304: static __inline void
                    305: ipq_unlock()
                    306: {
                    307:        int s;
                    308:
1.132     thorpej   309:        s = splvm();
1.75      thorpej   310:        ipq_locked = 0;
                    311:        splx(s);
                    312: }
                    313:
                    314: #ifdef DIAGNOSTIC
                    315: #define        IPQ_LOCK()                                                      \
                    316: do {                                                                   \
                    317:        if (ipq_lock_try() == 0) {                                      \
                    318:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    319:                panic("ipq_lock");                                      \
                    320:        }                                                               \
1.159     perry     321: } while (/*CONSTCOND*/ 0)
1.75      thorpej   322: #define        IPQ_LOCK_CHECK()                                                \
                    323: do {                                                                   \
                    324:        if (ipq_locked == 0) {                                          \
                    325:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    326:                panic("ipq lock check");                                \
                    327:        }                                                               \
1.159     perry     328: } while (/*CONSTCOND*/ 0)
1.75      thorpej   329: #else
                    330: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    331: #define        IPQ_LOCK_CHECK()        /* nothing */
                    332: #endif
                    333:
                    334: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       335:
1.166     matt      336: struct pool inmulti_pool;
1.72      thorpej   337: struct pool ipqent_pool;
                    338:
1.135     thorpej   339: #ifdef INET_CSUM_COUNTERS
                    340: #include <sys/device.h>
                    341:
                    342: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    343:     NULL, "inet", "hwcsum bad");
                    344: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    345:     NULL, "inet", "hwcsum ok");
                    346: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    347:     NULL, "inet", "swcsum");
                    348:
                    349: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    350:
                    351: #else
                    352:
                    353: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    354:
                    355: #endif /* INET_CSUM_COUNTERS */
                    356:
1.1       cgd       357: /*
                    358:  * We need to save the IP options in case a protocol wants to respond
                    359:  * to an incoming packet over the same route if the packet got here
                    360:  * using IP source routing.  This allows connection establishment and
                    361:  * maintenance when the remote end is on a network that is not known
                    362:  * to us.
                    363:  */
                    364: int    ip_nhops = 0;
                    365: static struct ip_srcrt {
                    366:        struct  in_addr dst;                    /* final destination */
                    367:        char    nop;                            /* one NOP to align */
                    368:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    369:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    370: } ip_srcrt;
                    371:
1.13      mycroft   372: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   373:
1.164     matt      374: #ifdef MBUFTRACE
                    375: struct mowner ip_rx_mowner = { "internet", "rx" };
                    376: struct mowner ip_tx_mowner = { "internet", "tx" };
                    377: #endif
                    378:
1.1       cgd       379: /*
1.194     jonathan  380:  * Compute IP limits derived from the value of nmbclusters.
                    381:  */
                    382: static void
                    383: ip_nmbclusters_changed(void)
                    384: {
                    385:        ip_maxfrags = nmbclusters / 4;
                    386:        ip_nmbclusters =  nmbclusters;
                    387: }
                    388:
                    389: /*
1.1       cgd       390:  * IP initialization: fill in IP protocol switch table.
                    391:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    392:  */
1.8       mycroft   393: void
1.1       cgd       394: ip_init()
                    395: {
1.109     augustss  396:        struct protosw *pr;
                    397:        int i;
1.1       cgd       398:
1.166     matt      399:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    400:            NULL);
1.72      thorpej   401:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   402:            NULL);
1.72      thorpej   403:
1.1       cgd       404:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    405:        if (pr == 0)
                    406:                panic("ip_init");
                    407:        for (i = 0; i < IPPROTO_MAX; i++)
                    408:                ip_protox[i] = pr - inetsw;
                    409:        for (pr = inetdomain.dom_protosw;
                    410:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    411:                if (pr->pr_domain->dom_family == PF_INET &&
                    412:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    413:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  414:
1.190     jonathan  415:        for (i = 0; i < IPREASS_NHASH; i++)
                    416:                LIST_INIT(&ipq[i]);
                    417:
1.183     jonathan  418:        ip_id = time.tv_sec & 0xfffff;
1.194     jonathan  419:
1.1       cgd       420:        ipintrq.ifq_maxlen = ipqmaxlen;
1.194     jonathan  421:        ip_nmbclusters_changed();
                    422:
1.181     jonathan  423:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        424:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    425:            M_WAITOK, &in_ifaddrhash);
1.166     matt      426:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    427:            M_WAITOK, &in_multihash);
1.160     itojun    428:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   429: #ifdef GATEWAY
                    430:        ipflow_init();
                    431: #endif
1.121     thorpej   432:
                    433: #ifdef PFIL_HOOKS
                    434:        /* Register our Packet Filter hook. */
1.126     thorpej   435:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    436:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   437:        i = pfil_head_register(&inet_pfil_hook);
                    438:        if (i != 0)
                    439:                printf("ip_init: WARNING: unable to register pfil hook, "
                    440:                    "error %d\n", i);
                    441: #endif /* PFIL_HOOKS */
1.135     thorpej   442:
                    443: #ifdef INET_CSUM_COUNTERS
                    444:        evcnt_attach_static(&ip_hwcsum_bad);
                    445:        evcnt_attach_static(&ip_hwcsum_ok);
                    446:        evcnt_attach_static(&ip_swcsum);
                    447: #endif /* INET_CSUM_COUNTERS */
1.164     matt      448:
                    449: #ifdef MBUFTRACE
                    450:        MOWNER_ATTACH(&ip_tx_mowner);
                    451:        MOWNER_ATTACH(&ip_rx_mowner);
                    452: #endif /* MBUFTRACE */
1.1       cgd       453: }
                    454:
                    455: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    456: struct route ipforward_rt;
                    457:
                    458: /*
1.89      itojun    459:  * IP software interrupt routine
                    460:  */
                    461: void
                    462: ipintr()
                    463: {
                    464:        int s;
                    465:        struct mbuf *m;
                    466:
                    467:        while (1) {
1.132     thorpej   468:                s = splnet();
1.89      itojun    469:                IF_DEQUEUE(&ipintrq, m);
                    470:                splx(s);
                    471:                if (m == 0)
                    472:                        return;
1.164     matt      473:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    474:                ip_input(m);
                    475:        }
                    476: }
                    477:
                    478: /*
1.1       cgd       479:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    480:  * try to reassemble.  Process options.  Pass to next level.
                    481:  */
1.8       mycroft   482: void
1.89      itojun    483: ip_input(struct mbuf *m)
1.1       cgd       484: {
1.109     augustss  485:        struct ip *ip = NULL;
                    486:        struct ipq *fp;
                    487:        struct in_ifaddr *ia;
                    488:        struct ifaddr *ifa;
1.25      cgd       489:        struct ipqent *ipqe;
1.89      itojun    490:        int hlen = 0, mff, len;
1.100     itojun    491:        int downmatch;
1.165     christos  492:        int checkif;
1.169     itojun    493:        int srcrt = 0;
1.190     jonathan  494:        u_int hash;
1.173     jonathan  495: #ifdef FAST_IPSEC
                    496:        struct m_tag *mtag;
                    497:        struct tdb_ident *tdbi;
                    498:        struct secpolicy *sp;
                    499:        int s, error;
                    500: #endif /* FAST_IPSEC */
1.1       cgd       501:
1.164     matt      502:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       503: #ifdef DIAGNOSTIC
                    504:        if ((m->m_flags & M_PKTHDR) == 0)
                    505:                panic("ipintr no HDR");
1.89      itojun    506: #endif
1.164     matt      507:
1.1       cgd       508:        /*
                    509:         * If no IP addresses have been set yet but the interfaces
                    510:         * are receiving, can't do anything with incoming packets yet.
                    511:         */
1.181     jonathan  512:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       513:                goto bad;
                    514:        ipstat.ips_total++;
1.154     thorpej   515:        /*
                    516:         * If the IP header is not aligned, slurp it up into a new
                    517:         * mbuf with space for link headers, in the event we forward
                    518:         * it.  Otherwise, if it is aligned, make sure the entire
                    519:         * base IP header is in the first mbuf of the chain.
                    520:         */
                    521:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    522:                if ((m = m_copyup(m, sizeof(struct ip),
                    523:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    524:                        /* XXXJRT new stat, please */
                    525:                        ipstat.ips_toosmall++;
                    526:                        return;
                    527:                }
                    528:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    529:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    530:                        ipstat.ips_toosmall++;
                    531:                        return;
                    532:                }
1.1       cgd       533:        }
                    534:        ip = mtod(m, struct ip *);
1.13      mycroft   535:        if (ip->ip_v != IPVERSION) {
                    536:                ipstat.ips_badvers++;
                    537:                goto bad;
                    538:        }
1.1       cgd       539:        hlen = ip->ip_hl << 2;
                    540:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    541:                ipstat.ips_badhlen++;
                    542:                goto bad;
                    543:        }
                    544:        if (hlen > m->m_len) {
                    545:                if ((m = m_pullup(m, hlen)) == 0) {
                    546:                        ipstat.ips_badhlen++;
1.89      itojun    547:                        return;
1.1       cgd       548:                }
                    549:                ip = mtod(m, struct ip *);
                    550:        }
1.98      thorpej   551:
1.85      hwr       552:        /*
1.99      thorpej   553:         * RFC1122: packets with a multicast source address are
1.98      thorpej   554:         * not allowed.
1.85      hwr       555:         */
                    556:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    557:                ipstat.ips_badaddr++;
1.85      hwr       558:                goto bad;
1.129     itojun    559:        }
                    560:
                    561:        /* 127/8 must not appear on wire - RFC1122 */
                    562:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    563:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    564:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    565:                        ipstat.ips_badaddr++;
1.129     itojun    566:                        goto bad;
1.130     itojun    567:                }
1.85      hwr       568:        }
                    569:
1.135     thorpej   570:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   571:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   572:                 M_CSUM_IPv4_BAD)) {
                    573:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    574:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    575:                goto badcsum;
                    576:
                    577:        case M_CSUM_IPv4:
                    578:                /* Checksum was okay. */
                    579:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    580:                break;
                    581:
                    582:        default:
                    583:                /* Must compute it ourselves. */
                    584:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    585:                if (in_cksum(m, hlen) != 0)
                    586:                        goto bad;
                    587:                break;
1.1       cgd       588:        }
                    589:
1.121     thorpej   590:        /* Retrieve the packet length. */
                    591:        len = ntohs(ip->ip_len);
1.81      proff     592:
                    593:        /*
                    594:         * Check for additional length bogosity
                    595:         */
1.84      proff     596:        if (len < hlen) {
1.81      proff     597:                ipstat.ips_badlen++;
                    598:                goto bad;
                    599:        }
1.1       cgd       600:
                    601:        /*
                    602:         * Check that the amount of data in the buffers
                    603:         * is as at least much as the IP header would have us expect.
                    604:         * Trim mbufs if longer than we expect.
                    605:         * Drop packet if shorter than we expect.
                    606:         */
1.35      mycroft   607:        if (m->m_pkthdr.len < len) {
1.1       cgd       608:                ipstat.ips_tooshort++;
                    609:                goto bad;
                    610:        }
1.35      mycroft   611:        if (m->m_pkthdr.len > len) {
1.1       cgd       612:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   613:                        m->m_len = len;
                    614:                        m->m_pkthdr.len = len;
1.1       cgd       615:                } else
1.35      mycroft   616:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       617:        }
                    618:
1.193     scw       619: #if defined(IPSEC)
1.149     wiz       620:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    621:        m->m_flags &= ~M_CANFASTFWD;
                    622: #else
1.64      thorpej   623:        /*
                    624:         * Assume that we can create a fast-forward IP flow entry
                    625:         * based on this packet.
                    626:         */
                    627:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    628: #endif
1.64      thorpej   629:
1.36      mrg       630: #ifdef PFIL_HOOKS
1.33      mrg       631:        /*
1.64      thorpej   632:         * Run through list of hooks for input packets.  If there are any
                    633:         * filters which require that additional packets in the flow are
                    634:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    635:         * Note that filters must _never_ set this flag, as another filter
                    636:         * in the list may have previously cleared it.
1.33      mrg       637:         */
1.127     itojun    638:        /*
                    639:         * let ipfilter look at packet on the wire,
                    640:         * not the decapsulated packet.
                    641:         */
                    642: #ifdef IPSEC
1.136     itojun    643:        if (!ipsec_getnhist(m))
1.186     scw       644: #elif defined(FAST_IPSEC)
                    645:        if (!ipsec_indone(m))
1.127     itojun    646: #else
                    647:        if (1)
                    648: #endif
                    649:        {
1.169     itojun    650:                struct in_addr odst;
                    651:
                    652:                odst = ip->ip_dst;
1.127     itojun    653:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    654:                    PFIL_IN) != 0)
                    655:                        return;
1.127     itojun    656:                if (m == NULL)
                    657:                        return;
                    658:                ip = mtod(m, struct ip *);
1.142     darrenr   659:                hlen = ip->ip_hl << 2;
1.169     itojun    660:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    661:        }
1.36      mrg       662: #endif /* PFIL_HOOKS */
1.123     thorpej   663:
                    664: #ifdef ALTQ
                    665:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    666:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    667:                /* packet dropped by traffic conditioner */
                    668:                return;
                    669:        }
                    670: #endif
1.121     thorpej   671:
                    672:        /*
1.1       cgd       673:         * Process options and, if not destined for us,
                    674:         * ship it on.  ip_dooptions returns 1 when an
                    675:         * error was detected (causing an icmp message
                    676:         * to be sent and the original packet to be freed).
                    677:         */
                    678:        ip_nhops = 0;           /* for source routed packets */
                    679:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    680:                return;
1.1       cgd       681:
                    682:        /*
1.165     christos  683:         * Enable a consistency check between the destination address
                    684:         * and the arrival interface for a unicast packet (the RFC 1122
                    685:         * strong ES model) if IP forwarding is disabled and the packet
                    686:         * is not locally generated.
                    687:         *
                    688:         * XXX - Checking also should be disabled if the destination
                    689:         * address is ipnat'ed to a different interface.
                    690:         *
                    691:         * XXX - Checking is incompatible with IP aliases added
                    692:         * to the loopback interface instead of the interface where
                    693:         * the packets are received.
                    694:         *
                    695:         * XXX - We need to add a per ifaddr flag for this so that
                    696:         * we get finer grain control.
                    697:         */
                    698:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    699:            (m->m_pkthdr.rcvif != NULL) &&
                    700:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    701:
                    702:        /*
1.1       cgd       703:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    704:         *
                    705:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    706:         * The behavior here is to treat addresses on !IFF_UP interface
                    707:         * as not mine.
1.1       cgd       708:         */
1.100     itojun    709:        downmatch = 0;
1.140     matt      710:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    711:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  712:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    713:                                continue;
1.97      itojun    714:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    715:                                break;
1.100     itojun    716:                        else
                    717:                                downmatch++;
1.97      itojun    718:                }
                    719:        }
1.86      thorpej   720:        if (ia != NULL)
                    721:                goto ours;
1.57      tls       722:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      723:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    724:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    725:                                continue;
1.57      tls       726:                        ia = ifatoia(ifa);
1.35      mycroft   727:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    728:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   729:                            /*
                    730:                             * Look for all-0's host part (old broadcast addr),
                    731:                             * either for subnet or net.
                    732:                             */
                    733:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   734:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       735:                                goto ours;
1.57      tls       736:                        /*
                    737:                         * An interface with IP address zero accepts
                    738:                         * all packets that arrive on that interface.
                    739:                         */
                    740:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    741:                                goto ours;
1.1       cgd       742:                }
                    743:        }
1.18      mycroft   744:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   745:                struct in_multi *inm;
                    746: #ifdef MROUTING
                    747:                extern struct socket *ip_mrouter;
1.10      brezak    748:
1.147     matt      749:                if (M_READONLY(m)) {
1.10      brezak    750:                        if ((m = m_pullup(m, hlen)) == 0) {
                    751:                                ipstat.ips_toosmall++;
1.89      itojun    752:                                return;
1.10      brezak    753:                        }
                    754:                        ip = mtod(m, struct ip *);
                    755:                }
1.4       hpeyerl   756:
                    757:                if (ip_mrouter) {
                    758:                        /*
                    759:                         * If we are acting as a multicast router, all
                    760:                         * incoming multicast packets are passed to the
                    761:                         * kernel-level multicast forwarding function.
                    762:                         * The packet is returned (relatively) intact; if
                    763:                         * ip_mforward() returns a non-zero value, the packet
                    764:                         * must be discarded, else it may be accepted below.
                    765:                         *
                    766:                         * (The IP ident field is put in the same byte order
                    767:                         * as expected when ip_mforward() is called from
                    768:                         * ip_output().)
                    769:                         */
1.13      mycroft   770:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    771:                                ipstat.ips_cantforward++;
1.4       hpeyerl   772:                                m_freem(m);
1.89      itojun    773:                                return;
1.4       hpeyerl   774:                        }
                    775:
                    776:                        /*
                    777:                         * The process-level routing demon needs to receive
                    778:                         * all multicast IGMP packets, whether or not this
                    779:                         * host belongs to their destination groups.
                    780:                         */
                    781:                        if (ip->ip_p == IPPROTO_IGMP)
                    782:                                goto ours;
1.13      mycroft   783:                        ipstat.ips_forward++;
1.4       hpeyerl   784:                }
                    785: #endif
                    786:                /*
                    787:                 * See if we belong to the destination multicast group on the
                    788:                 * arrival interface.
                    789:                 */
                    790:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    791:                if (inm == NULL) {
1.13      mycroft   792:                        ipstat.ips_cantforward++;
1.4       hpeyerl   793:                        m_freem(m);
1.89      itojun    794:                        return;
1.4       hpeyerl   795:                }
                    796:                goto ours;
                    797:        }
1.19      mycroft   798:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   799:            in_nullhost(ip->ip_dst))
1.1       cgd       800:                goto ours;
                    801:
                    802:        /*
                    803:         * Not for us; forward if possible and desirable.
                    804:         */
                    805:        if (ipforwarding == 0) {
                    806:                ipstat.ips_cantforward++;
                    807:                m_freem(m);
1.100     itojun    808:        } else {
                    809:                /*
                    810:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    811:                 * and there's no IFF_UP interface that matches ip_dst,
                    812:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    813:                 * forwarding loop till TTL goes to 0.
                    814:                 */
                    815:                if (downmatch) {
                    816:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    817:                        ipstat.ips_cantforward++;
                    818:                        return;
                    819:                }
1.145     itojun    820: #ifdef IPSEC
                    821:                if (ipsec4_in_reject(m, NULL)) {
                    822:                        ipsecstat.in_polvio++;
                    823:                        goto bad;
                    824:                }
                    825: #endif
1.173     jonathan  826: #ifdef FAST_IPSEC
                    827:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    828:                s = splsoftnet();
                    829:                if (mtag != NULL) {
                    830:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    831:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    832:                } else {
                    833:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    834:                                                   IP_FORWARDING, &error);
                    835:                }
                    836:                if (sp == NULL) {       /* NB: can happen if error */
                    837:                        splx(s);
                    838:                        /*XXX error stat???*/
                    839:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    840:                        goto bad;
                    841:                }
                    842:
                    843:                /*
                    844:                 * Check security policy against packet attributes.
                    845:                 */
                    846:                error = ipsec_in_reject(sp, m);
                    847:                KEY_FREESP(&sp);
                    848:                splx(s);
                    849:                if (error) {
                    850:                        ipstat.ips_cantforward++;
                    851:                        goto bad;
1.193     scw       852:                }
                    853:
                    854:                /*
                    855:                 * Peek at the outbound SP for this packet to determine if
                    856:                 * it's a Fast Forward candidate.
                    857:                 */
                    858:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    859:                if (mtag != NULL)
                    860:                        m->m_flags &= ~M_CANFASTFWD;
                    861:                else {
                    862:                        s = splsoftnet();
                    863:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    864:                            (IP_FORWARDING |
                    865:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    866:                            &error, NULL);
                    867:                        if (sp != NULL) {
                    868:                                m->m_flags &= ~M_CANFASTFWD;
                    869:                                KEY_FREESP(&sp);
                    870:                        }
                    871:                        splx(s);
1.173     jonathan  872:                }
                    873: #endif /* FAST_IPSEC */
1.145     itojun    874:
1.169     itojun    875:                ip_forward(m, srcrt);
1.100     itojun    876:        }
1.89      itojun    877:        return;
1.1       cgd       878:
                    879: ours:
                    880:        /*
                    881:         * If offset or IP_MF are set, must reassemble.
                    882:         * Otherwise, nothing need be done.
                    883:         * (We could look in the reassembly queue to see
                    884:         * if the packet was previously fragmented,
                    885:         * but it's not worth the time; just let them time out.)
                    886:         */
1.155     itojun    887:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    888:                if (M_READONLY(m)) {
                    889:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    890:                                ipstat.ips_toosmall++;
                    891:                                goto bad;
                    892:                        }
                    893:                        ip = mtod(m, struct ip *);
                    894:                }
                    895:
1.1       cgd       896:                /*
                    897:                 * Look for queue of fragments
                    898:                 * of this datagram.
                    899:                 */
1.75      thorpej   900:                IPQ_LOCK();
1.190     jonathan  901:                hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
                    902:                /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
                    903:                for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
                    904:                     fp = LIST_NEXT(fp, ipq_q)) {
1.1       cgd       905:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   906:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    907:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       908:                            ip->ip_p == fp->ipq_p)
                    909:                                goto found;
1.190     jonathan  910:
                    911:                }
1.1       cgd       912:                fp = 0;
                    913: found:
                    914:
                    915:                /*
                    916:                 * Adjust ip_len to not reflect header,
1.25      cgd       917:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       918:                 * convert offset of this to bytes.
                    919:                 */
1.155     itojun    920:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    921:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       922:                if (mff) {
1.16      cgd       923:                        /*
                    924:                         * Make sure that fragments have a data length
                    925:                         * that's a non-zero multiple of 8 bytes.
                    926:                         */
1.155     itojun    927:                        if (ntohs(ip->ip_len) == 0 ||
                    928:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       929:                                ipstat.ips_badfrags++;
1.75      thorpej   930:                                IPQ_UNLOCK();
1.16      cgd       931:                                goto bad;
                    932:                        }
                    933:                }
1.155     itojun    934:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       935:
                    936:                /*
                    937:                 * If datagram marked as having more fragments
                    938:                 * or if this is not the first fragment,
                    939:                 * attempt reassembly; if it succeeds, proceed.
                    940:                 */
1.155     itojun    941:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       942:                        ipstat.ips_fragments++;
1.72      thorpej   943:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       944:                        if (ipqe == NULL) {
                    945:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   946:                                IPQ_UNLOCK();
1.25      cgd       947:                                goto bad;
                    948:                        }
                    949:                        ipqe->ipqe_mff = mff;
1.50      thorpej   950:                        ipqe->ipqe_m = m;
1.25      cgd       951:                        ipqe->ipqe_ip = ip;
1.190     jonathan  952:                        m = ip_reass(ipqe, fp, &ipq[hash]);
1.75      thorpej   953:                        if (m == 0) {
                    954:                                IPQ_UNLOCK();
1.89      itojun    955:                                return;
1.75      thorpej   956:                        }
1.13      mycroft   957:                        ipstat.ips_reassembled++;
1.50      thorpej   958:                        ip = mtod(m, struct ip *);
1.74      thorpej   959:                        hlen = ip->ip_hl << 2;
1.155     itojun    960:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       961:                } else
                    962:                        if (fp)
                    963:                                ip_freef(fp);
1.75      thorpej   964:                IPQ_UNLOCK();
1.79      mycroft   965:        }
1.128     itojun    966:
1.173     jonathan  967: #if defined(IPSEC)
1.128     itojun    968:        /*
                    969:         * enforce IPsec policy checking if we are seeing last header.
                    970:         * note that we do not visit this with protocols with pcb layer
                    971:         * code - like udp/tcp/raw ip.
                    972:         */
                    973:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    974:            ipsec4_in_reject(m, NULL)) {
                    975:                ipsecstat.in_polvio++;
                    976:                goto bad;
                    977:        }
                    978: #endif
1.173     jonathan  979: #if FAST_IPSEC
                    980:        /*
                    981:         * enforce IPsec policy checking if we are seeing last header.
                    982:         * note that we do not visit this with protocols with pcb layer
                    983:         * code - like udp/tcp/raw ip.
                    984:         */
                    985:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    986:                /*
                    987:                 * Check if the packet has already had IPsec processing
                    988:                 * done.  If so, then just pass it along.  This tag gets
                    989:                 * set during AH, ESP, etc. input handling, before the
                    990:                 * packet is returned to the ip input queue for delivery.
                    991:                 */
                    992:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    993:                s = splsoftnet();
                    994:                if (mtag != NULL) {
                    995:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    996:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    997:                } else {
                    998:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    999:                                                   IP_FORWARDING, &error);
                   1000:                }
                   1001:                if (sp != NULL) {
                   1002:                        /*
                   1003:                         * Check security policy against packet attributes.
                   1004:                         */
                   1005:                        error = ipsec_in_reject(sp, m);
                   1006:                        KEY_FREESP(&sp);
                   1007:                } else {
                   1008:                        /* XXX error stat??? */
                   1009:                        error = EINVAL;
                   1010: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                   1011:                        goto bad;
                   1012:                }
                   1013:                splx(s);
                   1014:                if (error)
                   1015:                        goto bad;
                   1016:        }
                   1017: #endif /* FAST_IPSEC */
1.1       cgd      1018:
                   1019:        /*
                   1020:         * Switch out to protocol's input routine.
                   1021:         */
1.82      aidan    1022: #if IFA_STATS
1.122     itojun   1023:        if (ia && ip)
1.155     itojun   1024:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan    1025: #endif
1.1       cgd      1026:        ipstat.ips_delivered++;
1.89      itojun   1027:     {
                   1028:        int off = hlen, nh = ip->ip_p;
                   1029:
                   1030:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                   1031:        return;
                   1032:     }
1.1       cgd      1033: bad:
                   1034:        m_freem(m);
1.135     thorpej  1035:        return;
                   1036:
                   1037: badcsum:
                   1038:        ipstat.ips_badsum++;
                   1039:        m_freem(m);
1.1       cgd      1040: }
                   1041:
                   1042: /*
                   1043:  * Take incoming datagram fragment and try to
                   1044:  * reassemble it into whole datagram.  If a chain for
                   1045:  * reassembly of this datagram already exists, then it
                   1046:  * is given as fp; otherwise have to make a chain.
                   1047:  */
1.50      thorpej  1048: struct mbuf *
1.190     jonathan 1049: ip_reass(ipqe, fp, ipqhead)
1.109     augustss 1050:        struct ipqent *ipqe;
                   1051:        struct ipq *fp;
1.190     jonathan 1052:        struct ipqhead *ipqhead;
1.1       cgd      1053: {
1.109     augustss 1054:        struct mbuf *m = ipqe->ipqe_m;
                   1055:        struct ipqent *nq, *p, *q;
1.25      cgd      1056:        struct ip *ip;
1.1       cgd      1057:        struct mbuf *t;
1.25      cgd      1058:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd      1059:        int i, next;
                   1060:
1.75      thorpej  1061:        IPQ_LOCK_CHECK();
                   1062:
1.1       cgd      1063:        /*
                   1064:         * Presence of header sizes in mbufs
                   1065:         * would confuse code below.
                   1066:         */
                   1067:        m->m_data += hlen;
                   1068:        m->m_len -= hlen;
                   1069:
1.194     jonathan 1070: #ifdef notyet
                   1071:        /* make sure fragment limit is up-to-date */
                   1072:        CHECK_NMBCLUSTER_PARAMS();
                   1073:
                   1074:        /* If we have too many fragments, drop the older half. */
                   1075:        if (ip_nfrags >= ip_maxfrags)
                   1076:                ip_reass_drophalf(void);
                   1077: #endif
                   1078:
1.1       cgd      1079:        /*
1.192     jonathan 1080:         * We are about to add a fragment; increment frag count.
                   1081:         */
                   1082:        ip_nfrags++;
                   1083:
                   1084:        /*
1.1       cgd      1085:         * If first fragment to arrive, create a reassembly queue.
                   1086:         */
                   1087:        if (fp == 0) {
1.131     itojun   1088:                /*
                   1089:                 * Enforce upper bound on number of fragmented packets
                   1090:                 * for which we attempt reassembly;
                   1091:                 * If maxfrag is 0, never accept fragments.
                   1092:                 * If maxfrag is -1, accept all fragments without limitation.
                   1093:                 */
                   1094:                if (ip_maxfragpackets < 0)
                   1095:                        ;
                   1096:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1097:                        goto dropfrag;
                   1098:                ip_nfragpackets++;
1.50      thorpej  1099:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1100:                    M_FTABLE, M_NOWAIT);
                   1101:                if (fp == NULL)
1.1       cgd      1102:                        goto dropfrag;
1.190     jonathan 1103:                LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192     jonathan 1104:                fp->ipq_nfrags = 1;
1.1       cgd      1105:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1106:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1107:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1108:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1109:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1110:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1111:                p = NULL;
1.1       cgd      1112:                goto insert;
1.192     jonathan 1113:        } else {
                   1114:                fp->ipq_nfrags++;
1.1       cgd      1115:        }
                   1116:
                   1117:        /*
                   1118:         * Find a segment which begins after this one does.
                   1119:         */
1.148     matt     1120:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1121:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1122:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1123:                        break;
                   1124:
                   1125:        /*
                   1126:         * If there is a preceding segment, it may provide some of
                   1127:         * our data already.  If so, drop the data from the incoming
                   1128:         * segment.  If it provides all of our data, drop us.
                   1129:         */
1.25      cgd      1130:        if (p != NULL) {
1.155     itojun   1131:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1132:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1133:                if (i > 0) {
1.155     itojun   1134:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1135:                                goto dropfrag;
1.50      thorpej  1136:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1137:                        ipqe->ipqe_ip->ip_off =
                   1138:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1139:                        ipqe->ipqe_ip->ip_len =
                   1140:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1141:                }
                   1142:        }
                   1143:
                   1144:        /*
                   1145:         * While we overlap succeeding segments trim them or,
                   1146:         * if they are completely covered, dequeue them.
                   1147:         */
1.155     itojun   1148:        for (; q != NULL &&
                   1149:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1150:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1151:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1152:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1153:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1154:                        q->ipqe_ip->ip_len =
                   1155:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1156:                        q->ipqe_ip->ip_off =
                   1157:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1158:                        m_adj(q->ipqe_m, i);
1.1       cgd      1159:                        break;
                   1160:                }
1.148     matt     1161:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1162:                m_freem(q->ipqe_m);
1.148     matt     1163:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1164:                pool_put(&ipqent_pool, q);
1.192     jonathan 1165:                fp->ipq_nfrags--;
                   1166:                ip_nfrags--;
1.1       cgd      1167:        }
                   1168:
                   1169: insert:
                   1170:        /*
                   1171:         * Stick new segment in its place;
                   1172:         * check for complete reassembly.
                   1173:         */
1.25      cgd      1174:        if (p == NULL) {
1.148     matt     1175:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1176:        } else {
1.148     matt     1177:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1178:        }
1.1       cgd      1179:        next = 0;
1.148     matt     1180:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1181:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1182:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1183:                        return (0);
1.155     itojun   1184:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1185:        }
1.25      cgd      1186:        if (p->ipqe_mff)
1.1       cgd      1187:                return (0);
                   1188:
                   1189:        /*
1.41      thorpej  1190:         * Reassembly is complete.  Check for a bogus message size and
                   1191:         * concatenate fragments.
1.1       cgd      1192:         */
1.148     matt     1193:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1194:        ip = q->ipqe_ip;
1.41      thorpej  1195:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1196:                ipstat.ips_toolong++;
                   1197:                ip_freef(fp);
                   1198:                return (0);
                   1199:        }
1.50      thorpej  1200:        m = q->ipqe_m;
1.1       cgd      1201:        t = m->m_next;
                   1202:        m->m_next = 0;
                   1203:        m_cat(m, t);
1.148     matt     1204:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1205:        pool_put(&ipqent_pool, q);
1.25      cgd      1206:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1207:                t = q->ipqe_m;
1.148     matt     1208:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1209:                pool_put(&ipqent_pool, q);
1.1       cgd      1210:                m_cat(m, t);
                   1211:        }
1.192     jonathan 1212:        ip_nfrags -= fp->ipq_nfrags;
1.1       cgd      1213:
                   1214:        /*
                   1215:         * Create header for new ip packet by
                   1216:         * modifying header of first packet;
                   1217:         * dequeue and discard fragment reassembly header.
                   1218:         * Make header visible.
                   1219:         */
1.155     itojun   1220:        ip->ip_len = htons(next);
1.25      cgd      1221:        ip->ip_src = fp->ipq_src;
                   1222:        ip->ip_dst = fp->ipq_dst;
                   1223:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1224:        FREE(fp, M_FTABLE);
1.131     itojun   1225:        ip_nfragpackets--;
1.1       cgd      1226:        m->m_len += (ip->ip_hl << 2);
                   1227:        m->m_data -= (ip->ip_hl << 2);
                   1228:        /* some debugging cruft by sklower, below, will go away soon */
                   1229:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1230:                int plen = 0;
1.50      thorpej  1231:                for (t = m; t; t = t->m_next)
                   1232:                        plen += t->m_len;
                   1233:                m->m_pkthdr.len = plen;
1.1       cgd      1234:        }
1.50      thorpej  1235:        return (m);
1.1       cgd      1236:
                   1237: dropfrag:
1.192     jonathan 1238:        if (fp != 0)
                   1239:                fp->ipq_nfrags--;
                   1240:        ip_nfrags--;
1.1       cgd      1241:        ipstat.ips_fragdropped++;
                   1242:        m_freem(m);
1.72      thorpej  1243:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1244:        return (0);
                   1245: }
                   1246:
                   1247: /*
                   1248:  * Free a fragment reassembly header and all
                   1249:  * associated datagrams.
                   1250:  */
1.8       mycroft  1251: void
1.1       cgd      1252: ip_freef(fp)
                   1253:        struct ipq *fp;
                   1254: {
1.109     augustss 1255:        struct ipqent *q, *p;
1.192     jonathan 1256:        u_int nfrags = 0;
1.1       cgd      1257:
1.75      thorpej  1258:        IPQ_LOCK_CHECK();
                   1259:
1.148     matt     1260:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1261:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1262:                m_freem(q->ipqe_m);
1.192     jonathan 1263:                nfrags++;
1.148     matt     1264:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1265:                pool_put(&ipqent_pool, q);
1.1       cgd      1266:        }
1.192     jonathan 1267:
                   1268:        if (nfrags != fp->ipq_nfrags)
                   1269:            printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
                   1270:        ip_nfrags -= nfrags;
1.25      cgd      1271:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1272:        FREE(fp, M_FTABLE);
1.131     itojun   1273:        ip_nfragpackets--;
1.1       cgd      1274: }
                   1275:
                   1276: /*
1.194     jonathan 1277:  * IP reassembly TTL machinery for  multiplicative drop.
                   1278:  */
                   1279: static u_int   fragttl_histo[(IPFRAGTTL+1)];
                   1280:
                   1281:
                   1282: /*
                   1283:  * Decrement TTL of all reasembly queue entries by `ticks'.
                   1284:  * Count number of distinct fragments (as opposed to partial, fragmented
                   1285:  * datagrams) in the reassembly queue.  While we  traverse the entire
                   1286:  * reassembly queue, compute and return the median TTL over all fragments.
                   1287:  */
                   1288: static u_int
                   1289: ip_reass_ttl_decr(u_int ticks)
                   1290: {
                   1291:        u_int i, nfrags, median;
                   1292:        struct ipq *fp, *nfp;
                   1293:        u_int dropfraction, keepfraction;
                   1294:
                   1295:        nfrags = 0;
                   1296:        memset(fragttl_histo, 0, sizeof fragttl_histo);
                   1297:
                   1298:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1299:                for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
                   1300:                        fp->ipq_ttl = ((fp->ipq_ttl  <= ticks) ?
                   1301:                                       0 : fp->ipq_ttl - ticks);
                   1302:                        nfp = LIST_NEXT(fp, ipq_q);
                   1303:                        if (fp->ipq_ttl == 0) {
                   1304:                                ipstat.ips_fragtimeout++;
                   1305:                                ip_freef(fp);
                   1306:                        } else {
                   1307:                                nfrags += fp->ipq_nfrags;
                   1308:                                fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
                   1309:                        }
                   1310:                }
                   1311:        }
                   1312:
                   1313:        KASSERT(ip_nfrags == nfrags);
                   1314:
                   1315:        /* Find median (or other drop fraction) in histogram. */
                   1316:        dropfraction = (ip_nfrags / 2);
                   1317:        keepfraction = ip_nfrags - dropfraction;
                   1318:        for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
                   1319:                median +=  fragttl_histo[i];
                   1320:                if (median >= keepfraction)
                   1321:                        break;
                   1322:        }
                   1323:
                   1324:        /* Return TTL of median (or other fraction). */
                   1325:        return (u_int)i;
                   1326: }
                   1327:
                   1328: void
                   1329: ip_reass_drophalf(void)
                   1330: {
                   1331:
                   1332:        u_int median_ticks;
                   1333:        /*
                   1334:         * Compute median TTL of all fragments, and count frags
                   1335:         * with that TTL or lower (roughly half of all fragments).
                   1336:         */
                   1337:        median_ticks = ip_reass_ttl_decr(0);
                   1338:
                   1339:        /* Drop half. */
                   1340:        median_ticks = ip_reass_ttl_decr(median_ticks);
                   1341:
                   1342: }
                   1343:
                   1344: /*
1.1       cgd      1345:  * IP timer processing;
                   1346:  * if a timer expires on a reassembly
                   1347:  * queue, discard it.
                   1348:  */
1.8       mycroft  1349: void
1.1       cgd      1350: ip_slowtimo()
                   1351: {
1.191     jonathan 1352:        static u_int dropscanidx = 0;
                   1353:        u_int i;
1.194     jonathan 1354:        u_int median_ttl;
1.24      mycroft  1355:        int s = splsoftnet();
1.1       cgd      1356:
1.75      thorpej  1357:        IPQ_LOCK();
1.194     jonathan 1358:
                   1359:        /* Age TTL of all fragments by 1 tick .*/
                   1360:        median_ttl = ip_reass_ttl_decr(1);
                   1361:
                   1362:        /* make sure fragment limit is up-to-date */
                   1363:        CHECK_NMBCLUSTER_PARAMS();
                   1364:
                   1365:        /* If we have too many fragments, drop the older half. */
                   1366:        if (ip_nfrags > ip_maxfrags)
                   1367:                ip_reass_ttl_decr(median_ttl);
                   1368:
1.131     itojun   1369:        /*
1.194     jonathan 1370:         * If we are over the maximum number of fragmented packets
1.131     itojun   1371:         * (due to the limit being lowered), drain off
1.190     jonathan 1372:         * enough to get down to the new limit. Start draining
                   1373:         * from the reassembly hashqueue most recently drained.
1.131     itojun   1374:         */
                   1375:        if (ip_maxfragpackets < 0)
                   1376:                ;
                   1377:        else {
1.190     jonathan 1378:                int wrapped = 0;
                   1379:
                   1380:                i = dropscanidx;
                   1381:                while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
                   1382:                        while (LIST_FIRST(&ipq[i]) != NULL)
                   1383:                                ip_freef(LIST_FIRST(&ipq[i]));
                   1384:                        if (++i >= IPREASS_NHASH) {
                   1385:                                i = 0;
                   1386:                        }
                   1387:                        /*
                   1388:                         * Dont scan forever even if fragment counters are
                   1389:                         * wrong: stop after scanning entire reassembly queue.
                   1390:                         */
                   1391:                        if (i == dropscanidx)
                   1392:                            wrapped = 1;
                   1393:                }
                   1394:                dropscanidx = i;
1.131     itojun   1395:        }
1.75      thorpej  1396:        IPQ_UNLOCK();
1.63      matt     1397: #ifdef GATEWAY
                   1398:        ipflow_slowtimo();
                   1399: #endif
1.1       cgd      1400:        splx(s);
                   1401: }
                   1402:
                   1403: /*
                   1404:  * Drain off all datagram fragments.
                   1405:  */
1.8       mycroft  1406: void
1.1       cgd      1407: ip_drain()
                   1408: {
                   1409:
1.75      thorpej  1410:        /*
                   1411:         * We may be called from a device's interrupt context.  If
                   1412:         * the ipq is already busy, just bail out now.
                   1413:         */
                   1414:        if (ipq_lock_try() == 0)
                   1415:                return;
                   1416:
1.194     jonathan 1417:        /*
                   1418:         * Drop half the total fragments now. If more mbufs are needed,
                   1419:         *  we will be called again soon.
                   1420:         */
                   1421:        ip_reass_drophalf();
1.75      thorpej  1422:
                   1423:        IPQ_UNLOCK();
1.1       cgd      1424: }
                   1425:
                   1426: /*
                   1427:  * Do option processing on a datagram,
                   1428:  * possibly discarding it if bad options are encountered,
                   1429:  * or forwarding it if source-routed.
                   1430:  * Returns 1 if packet has been forwarded/freed,
                   1431:  * 0 if the packet should be processed further.
                   1432:  */
1.8       mycroft  1433: int
1.1       cgd      1434: ip_dooptions(m)
                   1435:        struct mbuf *m;
                   1436: {
1.109     augustss 1437:        struct ip *ip = mtod(m, struct ip *);
                   1438:        u_char *cp, *cp0;
                   1439:        struct ip_timestamp *ipt;
                   1440:        struct in_ifaddr *ia;
1.1       cgd      1441:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1442:        struct in_addr dst;
1.1       cgd      1443:        n_time ntime;
                   1444:
1.13      mycroft  1445:        dst = ip->ip_dst;
1.1       cgd      1446:        cp = (u_char *)(ip + 1);
                   1447:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1448:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1449:                opt = cp[IPOPT_OPTVAL];
                   1450:                if (opt == IPOPT_EOL)
                   1451:                        break;
                   1452:                if (opt == IPOPT_NOP)
                   1453:                        optlen = 1;
                   1454:                else {
1.113     itojun   1455:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1456:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1457:                                goto bad;
                   1458:                        }
1.1       cgd      1459:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1460:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1461:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1462:                                goto bad;
                   1463:                        }
                   1464:                }
                   1465:                switch (opt) {
                   1466:
                   1467:                default:
                   1468:                        break;
                   1469:
                   1470:                /*
                   1471:                 * Source routing with record.
                   1472:                 * Find interface with current destination address.
                   1473:                 * If none on this machine then drop if strictly routed,
                   1474:                 * or do nothing if loosely routed.
                   1475:                 * Record interface address and bring up next address
                   1476:                 * component.  If strictly routed make sure next
                   1477:                 * address is on directly accessible net.
                   1478:                 */
                   1479:                case IPOPT_LSRR:
                   1480:                case IPOPT_SSRR:
1.47      cjs      1481:                        if (ip_allowsrcrt == 0) {
                   1482:                                type = ICMP_UNREACH;
                   1483:                                code = ICMP_UNREACH_NET_PROHIB;
                   1484:                                goto bad;
                   1485:                        }
1.114     itojun   1486:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1487:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1488:                                goto bad;
                   1489:                        }
1.1       cgd      1490:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1491:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1492:                                goto bad;
                   1493:                        }
                   1494:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1495:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1496:                        if (ia == 0) {
                   1497:                                if (opt == IPOPT_SSRR) {
                   1498:                                        type = ICMP_UNREACH;
                   1499:                                        code = ICMP_UNREACH_SRCFAIL;
                   1500:                                        goto bad;
                   1501:                                }
                   1502:                                /*
                   1503:                                 * Loose routing, and not at next destination
                   1504:                                 * yet; nothing to do except forward.
                   1505:                                 */
                   1506:                                break;
                   1507:                        }
                   1508:                        off--;                  /* 0 origin */
1.112     sommerfe 1509:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1510:                                /*
                   1511:                                 * End of source route.  Should be for us.
                   1512:                                 */
                   1513:                                save_rte(cp, ip->ip_src);
                   1514:                                break;
                   1515:                        }
                   1516:                        /*
                   1517:                         * locate outgoing interface
                   1518:                         */
                   1519:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1520:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1521:                        if (opt == IPOPT_SSRR)
1.196     itojun   1522:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1523:                        else
1.1       cgd      1524:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1525:                        if (ia == 0) {
                   1526:                                type = ICMP_UNREACH;
                   1527:                                code = ICMP_UNREACH_SRCFAIL;
                   1528:                                goto bad;
                   1529:                        }
                   1530:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1531:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1532:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1533:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1534:                        /*
                   1535:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1536:                         */
1.18      mycroft  1537:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1538:                        break;
                   1539:
                   1540:                case IPOPT_RR:
1.114     itojun   1541:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1542:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1543:                                goto bad;
                   1544:                        }
1.1       cgd      1545:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1546:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1547:                                goto bad;
                   1548:                        }
                   1549:                        /*
                   1550:                         * If no space remains, ignore.
                   1551:                         */
                   1552:                        off--;                  /* 0 origin */
1.112     sommerfe 1553:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1554:                                break;
                   1555:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1556:                            sizeof(ipaddr.sin_addr));
                   1557:                        /*
                   1558:                         * locate outgoing interface; if we're the destination,
                   1559:                         * use the incoming interface (should be same).
                   1560:                         */
1.96      thorpej  1561:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1562:                            == NULL &&
                   1563:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1564:                                type = ICMP_UNREACH;
                   1565:                                code = ICMP_UNREACH_HOST;
                   1566:                                goto bad;
                   1567:                        }
1.20      mycroft  1568:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1569:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1570:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1571:                        break;
                   1572:
                   1573:                case IPOPT_TS:
                   1574:                        code = cp - (u_char *)ip;
                   1575:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1576:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1577:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1578:                                goto bad;
1.114     itojun   1579:                        }
                   1580:                        if (ipt->ipt_ptr < 5) {
                   1581:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1582:                                goto bad;
                   1583:                        }
1.15      cgd      1584:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1585:                                if (++ipt->ipt_oflw == 0) {
                   1586:                                        code = (u_char *)&ipt->ipt_ptr -
                   1587:                                            (u_char *)ip;
1.1       cgd      1588:                                        goto bad;
1.114     itojun   1589:                                }
1.1       cgd      1590:                                break;
                   1591:                        }
1.104     thorpej  1592:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1593:                        switch (ipt->ipt_flg) {
                   1594:
                   1595:                        case IPOPT_TS_TSONLY:
                   1596:                                break;
                   1597:
                   1598:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1599:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1600:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1601:                                        code = (u_char *)&ipt->ipt_ptr -
                   1602:                                            (u_char *)ip;
1.1       cgd      1603:                                        goto bad;
1.114     itojun   1604:                                }
1.13      mycroft  1605:                                ipaddr.sin_addr = dst;
1.96      thorpej  1606:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1607:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1608:                                if (ia == 0)
                   1609:                                        continue;
1.104     thorpej  1610:                                bcopy(&ia->ia_addr.sin_addr,
                   1611:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1612:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1613:                                break;
                   1614:
                   1615:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1616:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1617:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1618:                                        code = (u_char *)&ipt->ipt_ptr -
                   1619:                                            (u_char *)ip;
1.1       cgd      1620:                                        goto bad;
1.114     itojun   1621:                                }
1.104     thorpej  1622:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1623:                                    sizeof(struct in_addr));
1.96      thorpej  1624:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1625:                                    == NULL)
1.1       cgd      1626:                                        continue;
                   1627:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1628:                                break;
                   1629:
                   1630:                        default:
1.114     itojun   1631:                                /* XXX can't take &ipt->ipt_flg */
                   1632:                                code = (u_char *)&ipt->ipt_ptr -
                   1633:                                    (u_char *)ip + 1;
1.1       cgd      1634:                                goto bad;
                   1635:                        }
                   1636:                        ntime = iptime();
1.107     thorpej  1637:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1638:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1639:                            sizeof(n_time));
                   1640:                        ipt->ipt_ptr += sizeof(n_time);
                   1641:                }
                   1642:        }
                   1643:        if (forward) {
1.26      thorpej  1644:                if (ip_forwsrcrt == 0) {
                   1645:                        type = ICMP_UNREACH;
                   1646:                        code = ICMP_UNREACH_SRCFAIL;
                   1647:                        goto bad;
                   1648:                }
1.1       cgd      1649:                ip_forward(m, 1);
                   1650:                return (1);
1.13      mycroft  1651:        }
                   1652:        return (0);
1.1       cgd      1653: bad:
1.13      mycroft  1654:        icmp_error(m, type, code, 0, 0);
                   1655:        ipstat.ips_badoptions++;
1.1       cgd      1656:        return (1);
                   1657: }
                   1658:
                   1659: /*
                   1660:  * Given address of next destination (final or next hop),
                   1661:  * return internet address info of interface to be used to get there.
                   1662:  */
                   1663: struct in_ifaddr *
                   1664: ip_rtaddr(dst)
                   1665:         struct in_addr dst;
                   1666: {
1.109     augustss 1667:        struct sockaddr_in *sin;
1.1       cgd      1668:
1.19      mycroft  1669:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1670:
1.35      mycroft  1671:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1672:                if (ipforward_rt.ro_rt) {
                   1673:                        RTFREE(ipforward_rt.ro_rt);
                   1674:                        ipforward_rt.ro_rt = 0;
                   1675:                }
                   1676:                sin->sin_family = AF_INET;
                   1677:                sin->sin_len = sizeof(*sin);
                   1678:                sin->sin_addr = dst;
                   1679:
                   1680:                rtalloc(&ipforward_rt);
                   1681:        }
                   1682:        if (ipforward_rt.ro_rt == 0)
                   1683:                return ((struct in_ifaddr *)0);
1.19      mycroft  1684:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1685: }
                   1686:
                   1687: /*
                   1688:  * Save incoming source route for use in replies,
                   1689:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1690:  */
1.13      mycroft  1691: void
1.1       cgd      1692: save_rte(option, dst)
                   1693:        u_char *option;
                   1694:        struct in_addr dst;
                   1695: {
                   1696:        unsigned olen;
                   1697:
                   1698:        olen = option[IPOPT_OLEN];
                   1699: #ifdef DIAGNOSTIC
                   1700:        if (ipprintfs)
1.39      christos 1701:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1702: #endif /* 0 */
1.1       cgd      1703:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1704:                return;
                   1705:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1706:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1707:        ip_srcrt.dst = dst;
                   1708: }
                   1709:
                   1710: /*
                   1711:  * Retrieve incoming source route for use in replies,
                   1712:  * in the same form used by setsockopt.
                   1713:  * The first hop is placed before the options, will be removed later.
                   1714:  */
                   1715: struct mbuf *
                   1716: ip_srcroute()
                   1717: {
1.109     augustss 1718:        struct in_addr *p, *q;
                   1719:        struct mbuf *m;
1.1       cgd      1720:
                   1721:        if (ip_nhops == 0)
                   1722:                return ((struct mbuf *)0);
                   1723:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1724:        if (m == 0)
                   1725:                return ((struct mbuf *)0);
                   1726:
1.164     matt     1727:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1728: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1729:
                   1730:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1731:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1732:            OPTSIZ;
                   1733: #ifdef DIAGNOSTIC
                   1734:        if (ipprintfs)
1.39      christos 1735:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1736: #endif
                   1737:
                   1738:        /*
                   1739:         * First save first hop for return route
                   1740:         */
                   1741:        p = &ip_srcrt.route[ip_nhops - 1];
                   1742:        *(mtod(m, struct in_addr *)) = *p--;
                   1743: #ifdef DIAGNOSTIC
                   1744:        if (ipprintfs)
1.39      christos 1745:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1746: #endif
                   1747:
                   1748:        /*
                   1749:         * Copy option fields and padding (nop) to mbuf.
                   1750:         */
                   1751:        ip_srcrt.nop = IPOPT_NOP;
                   1752:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1753:        bcopy((caddr_t)&ip_srcrt.nop,
                   1754:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1755:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1756:            sizeof(struct in_addr) + OPTSIZ);
                   1757: #undef OPTSIZ
                   1758:        /*
                   1759:         * Record return path as an IP source route,
                   1760:         * reversing the path (pointers are now aligned).
                   1761:         */
                   1762:        while (p >= ip_srcrt.route) {
                   1763: #ifdef DIAGNOSTIC
                   1764:                if (ipprintfs)
1.39      christos 1765:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1766: #endif
                   1767:                *q++ = *p--;
                   1768:        }
                   1769:        /*
                   1770:         * Last hop goes to final destination.
                   1771:         */
                   1772:        *q = ip_srcrt.dst;
                   1773: #ifdef DIAGNOSTIC
                   1774:        if (ipprintfs)
1.39      christos 1775:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1776: #endif
                   1777:        return (m);
                   1778: }
                   1779:
                   1780: /*
                   1781:  * Strip out IP options, at higher
                   1782:  * level protocol in the kernel.
                   1783:  * Second argument is buffer to which options
                   1784:  * will be moved, and return value is their length.
                   1785:  * XXX should be deleted; last arg currently ignored.
                   1786:  */
1.8       mycroft  1787: void
1.1       cgd      1788: ip_stripoptions(m, mopt)
1.109     augustss 1789:        struct mbuf *m;
1.1       cgd      1790:        struct mbuf *mopt;
                   1791: {
1.109     augustss 1792:        int i;
1.1       cgd      1793:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1794:        caddr_t opts;
1.1       cgd      1795:        int olen;
                   1796:
1.79      mycroft  1797:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1798:        opts = (caddr_t)(ip + 1);
                   1799:        i = m->m_len - (sizeof (struct ip) + olen);
                   1800:        bcopy(opts  + olen, opts, (unsigned)i);
                   1801:        m->m_len -= olen;
                   1802:        if (m->m_flags & M_PKTHDR)
                   1803:                m->m_pkthdr.len -= olen;
1.155     itojun   1804:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1805:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1806: }
                   1807:
1.139     matt     1808: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1809:        0,              0,              0,              0,
                   1810:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1811:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1812:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1813:        0,              0,              0,              0,
                   1814:        ENOPROTOOPT
                   1815: };
                   1816:
                   1817: /*
                   1818:  * Forward a packet.  If some error occurs return the sender
                   1819:  * an icmp packet.  Note we can't always generate a meaningful
                   1820:  * icmp message because icmp doesn't have a large enough repertoire
                   1821:  * of codes and types.
                   1822:  *
                   1823:  * If not forwarding, just drop the packet.  This could be confusing
                   1824:  * if ipforwarding was zero but some routing protocol was advancing
                   1825:  * us as a gateway to somewhere.  However, we must let the routing
                   1826:  * protocol deal with that.
                   1827:  *
                   1828:  * The srcrt parameter indicates whether the packet is being forwarded
                   1829:  * via a source route.
                   1830:  */
1.13      mycroft  1831: void
1.1       cgd      1832: ip_forward(m, srcrt)
                   1833:        struct mbuf *m;
                   1834:        int srcrt;
                   1835: {
1.109     augustss 1836:        struct ip *ip = mtod(m, struct ip *);
                   1837:        struct sockaddr_in *sin;
                   1838:        struct rtentry *rt;
1.28      christos 1839:        int error, type = 0, code = 0;
1.1       cgd      1840:        struct mbuf *mcopy;
1.13      mycroft  1841:        n_long dest;
                   1842:        struct ifnet *destifp;
1.173     jonathan 1843: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1844:        struct ifnet dummyifp;
                   1845: #endif
1.164     matt     1846:
                   1847:        /*
                   1848:         * We are now in the output path.
                   1849:         */
                   1850:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1851:
                   1852:        /*
                   1853:         * Clear any in-bound checksum flags for this packet.
                   1854:         */
                   1855:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1856:
1.13      mycroft  1857:        dest = 0;
1.1       cgd      1858: #ifdef DIAGNOSTIC
                   1859:        if (ipprintfs)
1.70      thorpej  1860:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1861:                    ntohl(ip->ip_src.s_addr),
                   1862:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1863: #endif
1.93      sommerfe 1864:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1865:                ipstat.ips_cantforward++;
                   1866:                m_freem(m);
                   1867:                return;
                   1868:        }
                   1869:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1870:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1871:                return;
                   1872:        }
                   1873:        ip->ip_ttl -= IPTTLDEC;
                   1874:
1.19      mycroft  1875:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1876:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1877:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1878:                if (ipforward_rt.ro_rt) {
                   1879:                        RTFREE(ipforward_rt.ro_rt);
                   1880:                        ipforward_rt.ro_rt = 0;
                   1881:                }
                   1882:                sin->sin_family = AF_INET;
1.35      mycroft  1883:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1884:                sin->sin_addr = ip->ip_dst;
                   1885:
                   1886:                rtalloc(&ipforward_rt);
                   1887:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1888:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1889:                        return;
                   1890:                }
                   1891:                rt = ipforward_rt.ro_rt;
                   1892:        }
                   1893:
                   1894:        /*
1.34      mycroft  1895:         * Save at most 68 bytes of the packet in case
1.1       cgd      1896:         * we need to generate an ICMP message to the src.
1.119     itojun   1897:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1898:         */
1.155     itojun   1899:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1900:        if (mcopy)
                   1901:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1902:
                   1903:        /*
                   1904:         * If forwarding packet using same interface that it came in on,
                   1905:         * perhaps should send a redirect to sender to shortcut a hop.
                   1906:         * Only send redirect if source is sending directly to us,
                   1907:         * and if packet was not source routed (or has any options).
                   1908:         * Also, don't send redirect if forwarding using a default route
                   1909:         * or a route modified by a redirect.
                   1910:         */
                   1911:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1912:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1913:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1914:            ipsendredirects && !srcrt) {
1.19      mycroft  1915:                if (rt->rt_ifa &&
                   1916:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1917:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1918:                        if (rt->rt_flags & RTF_GATEWAY)
                   1919:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1920:                        else
                   1921:                                dest = ip->ip_dst.s_addr;
                   1922:                        /*
                   1923:                         * Router requirements says to only send host
                   1924:                         * redirects.
                   1925:                         */
                   1926:                        type = ICMP_REDIRECT;
                   1927:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1928: #ifdef DIAGNOSTIC
1.77      thorpej  1929:                        if (ipprintfs)
                   1930:                                printf("redirect (%d) to %x\n", code,
                   1931:                                    (u_int32_t)dest);
1.1       cgd      1932: #endif
                   1933:                }
                   1934:        }
                   1935:
1.27      thorpej  1936:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1937:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1938:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1939:
1.1       cgd      1940:        if (error)
                   1941:                ipstat.ips_cantforward++;
                   1942:        else {
                   1943:                ipstat.ips_forward++;
                   1944:                if (type)
                   1945:                        ipstat.ips_redirectsent++;
                   1946:                else {
1.63      matt     1947:                        if (mcopy) {
                   1948: #ifdef GATEWAY
1.64      thorpej  1949:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1950:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1951: #endif
1.1       cgd      1952:                                m_freem(mcopy);
1.63      matt     1953:                        }
1.1       cgd      1954:                        return;
                   1955:                }
                   1956:        }
                   1957:        if (mcopy == NULL)
                   1958:                return;
1.13      mycroft  1959:        destifp = NULL;
                   1960:
1.1       cgd      1961:        switch (error) {
                   1962:
                   1963:        case 0:                         /* forwarded, but need redirect */
                   1964:                /* type, code set above */
                   1965:                break;
                   1966:
                   1967:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1968:        case EHOSTUNREACH:
                   1969:        case ENETDOWN:
                   1970:        case EHOSTDOWN:
                   1971:        default:
                   1972:                type = ICMP_UNREACH;
                   1973:                code = ICMP_UNREACH_HOST;
                   1974:                break;
                   1975:
                   1976:        case EMSGSIZE:
                   1977:                type = ICMP_UNREACH;
                   1978:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1979: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1980:                if (ipforward_rt.ro_rt)
                   1981:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1982: #else
                   1983:                /*
                   1984:                 * If the packet is routed over IPsec tunnel, tell the
                   1985:                 * originator the tunnel MTU.
                   1986:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1987:                 * XXX quickhack!!!
                   1988:                 */
                   1989:                if (ipforward_rt.ro_rt) {
                   1990:                        struct secpolicy *sp;
                   1991:                        int ipsecerror;
1.95      itojun   1992:                        size_t ipsechdr;
1.89      itojun   1993:                        struct route *ro;
                   1994:
                   1995:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1996:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1997:                            &ipsecerror);
1.89      itojun   1998:
                   1999:                        if (sp == NULL)
                   2000:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   2001:                        else {
                   2002:                                /* count IPsec header size */
1.95      itojun   2003:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   2004:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   2005:
                   2006:                                /*
                   2007:                                 * find the correct route for outer IPv4
                   2008:                                 * header, compute tunnel MTU.
                   2009:                                 *
                   2010:                                 * XXX BUG ALERT
                   2011:                                 * The "dummyifp" code relies upon the fact
                   2012:                                 * that icmp_error() touches only ifp->if_mtu.
                   2013:                                 */
                   2014:                                /*XXX*/
                   2015:                                destifp = NULL;
                   2016:                                if (sp->req != NULL
1.95      itojun   2017:                                 && sp->req->sav != NULL
                   2018:                                 && sp->req->sav->sah != NULL) {
                   2019:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   2020:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   2021:                                                dummyifp.if_mtu =
1.151     itojun   2022:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   2023:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   2024:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   2025:                                                dummyifp.if_mtu -= ipsechdr;
                   2026:                                                destifp = &dummyifp;
                   2027:                                        }
                   2028:                                }
                   2029:
1.173     jonathan 2030: #ifdef IPSEC
1.89      itojun   2031:                                key_freesp(sp);
1.173     jonathan 2032: #else
                   2033:                                KEY_FREESP(&sp);
                   2034: #endif
1.89      itojun   2035:                        }
                   2036:                }
                   2037: #endif /*IPSEC*/
1.1       cgd      2038:                ipstat.ips_cantfrag++;
                   2039:                break;
                   2040:
                   2041:        case ENOBUFS:
1.143     itojun   2042: #if 1
                   2043:                /*
                   2044:                 * a router should not generate ICMP_SOURCEQUENCH as
                   2045:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   2046:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      2047:                 * or if the underlying interface is rate-limited.
1.143     itojun   2048:                 */
                   2049:                if (mcopy)
                   2050:                        m_freem(mcopy);
                   2051:                return;
                   2052: #else
1.1       cgd      2053:                type = ICMP_SOURCEQUENCH;
                   2054:                code = 0;
                   2055:                break;
1.143     itojun   2056: #endif
1.1       cgd      2057:        }
1.13      mycroft  2058:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  2059: }
                   2060:
                   2061: void
                   2062: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 2063:        struct inpcb *inp;
                   2064:        struct mbuf **mp;
                   2065:        struct ip *ip;
                   2066:        struct mbuf *m;
1.44      thorpej  2067: {
                   2068:
                   2069:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   2070:                struct timeval tv;
                   2071:
                   2072:                microtime(&tv);
                   2073:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   2074:                    SCM_TIMESTAMP, SOL_SOCKET);
                   2075:                if (*mp)
                   2076:                        mp = &(*mp)->m_next;
                   2077:        }
                   2078:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   2079:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   2080:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   2081:                if (*mp)
                   2082:                        mp = &(*mp)->m_next;
                   2083:        }
                   2084: #ifdef notyet
                   2085:        /*
                   2086:         * XXX
                   2087:         * Moving these out of udp_input() made them even more broken
                   2088:         * than they already were.
                   2089:         *      - fenner@parc.xerox.com
                   2090:         */
                   2091:        /* options were tossed already */
                   2092:        if (inp->inp_flags & INP_RECVOPTS) {
                   2093:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   2094:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   2095:                if (*mp)
                   2096:                        mp = &(*mp)->m_next;
                   2097:        }
                   2098:        /* ip_srcroute doesn't do what we want here, need to fix */
                   2099:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   2100:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   2101:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   2102:                if (*mp)
                   2103:                        mp = &(*mp)->m_next;
                   2104:        }
                   2105: #endif
                   2106:        if (inp->inp_flags & INP_RECVIF) {
                   2107:                struct sockaddr_dl sdl;
                   2108:
                   2109:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   2110:                sdl.sdl_family = AF_LINK;
                   2111:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   2112:                    m->m_pkthdr.rcvif->if_index : 0;
                   2113:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   2114:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   2115:                    IP_RECVIF, IPPROTO_IP);
                   2116:                if (*mp)
                   2117:                        mp = &(*mp)->m_next;
                   2118:        }
1.13      mycroft  2119: }
                   2120:
1.189     atatat   2121: /*
                   2122:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   2123:  * range of the new value and tweaks timers if it changes.
                   2124:  */
                   2125: static int
                   2126: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  2127: {
1.189     atatat   2128:        int error, tmp;
                   2129:        struct sysctlnode node;
                   2130:
                   2131:        node = *rnode;
                   2132:        tmp = ip_mtudisc_timeout;
                   2133:        node.sysctl_data = &tmp;
                   2134:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2135:        if (error || newp == NULL)
                   2136:                return (error);
                   2137:        if (tmp < 0)
                   2138:                return (EINVAL);
1.52      thorpej  2139:
1.189     atatat   2140:        ip_mtudisc_timeout = tmp;
                   2141:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   2142:
                   2143:        return (0);
                   2144: }
1.54      lukem    2145:
1.65      matt     2146: #ifdef GATEWAY
1.189     atatat   2147: /*
                   2148:  * sysctl helper routine for net.inet.ip.maxflows.  apparently if
                   2149:  * maxflows is even looked up, we "reap flows".
                   2150:  */
                   2151: static int
                   2152: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   2153: {
                   2154:        int s;
1.67      thorpej  2155:
1.189     atatat   2156:        s = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   2157:        if (s)
                   2158:                return (s);
                   2159:
                   2160:        s = splsoftnet();
                   2161:        ipflow_reap(0);
                   2162:        splx(s);
1.144     martin   2163:
1.189     atatat   2164:        return (0);
                   2165: }
                   2166: #endif /* GATEWAY */
1.117     tron     2167:
1.131     itojun   2168:
1.189     atatat   2169: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
                   2170: {
                   2171:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 2172:
1.197     atatat   2173:        sysctl_createv(clog, 0, NULL, NULL,
                   2174:                       CTLFLAG_PERMANENT,
1.189     atatat   2175:                       CTLTYPE_NODE, "net", NULL,
                   2176:                       NULL, 0, NULL, 0,
                   2177:                       CTL_NET, CTL_EOL);
1.197     atatat   2178:        sysctl_createv(clog, 0, NULL, NULL,
                   2179:                       CTLFLAG_PERMANENT,
1.197.2.1! tron     2180:                       CTLTYPE_NODE, "inet",
        !          2181:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   2182:                       NULL, 0, NULL, 0,
                   2183:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   2184:        sysctl_createv(clog, 0, NULL, NULL,
                   2185:                       CTLFLAG_PERMANENT,
1.197.2.1! tron     2186:                       CTLTYPE_NODE, "ip",
        !          2187:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   2188:                       NULL, 0, NULL, 0,
                   2189:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
                   2190:
1.197     atatat   2191:        sysctl_createv(clog, 0, NULL, NULL,
                   2192:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2193:                       CTLTYPE_INT, "forwarding",
        !          2194:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   2195:                       NULL, 0, &ipforwarding, 0,
                   2196:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2197:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   2198:        sysctl_createv(clog, 0, NULL, NULL,
                   2199:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2200:                       CTLTYPE_INT, "redirect",
        !          2201:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   2202:                       NULL, 0, &ipsendredirects, 0,
                   2203:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2204:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   2205:        sysctl_createv(clog, 0, NULL, NULL,
                   2206:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2207:                       CTLTYPE_INT, "ttl",
        !          2208:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   2209:                       NULL, 0, &ip_defttl, 0,
                   2210:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2211:                       IPCTL_DEFTTL, CTL_EOL);
                   2212: #ifdef IPCTL_DEFMTU
1.197     atatat   2213:        sysctl_createv(clog, 0, NULL, NULL,
                   2214:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.197.2.1! tron     2215:                       CTLTYPE_INT, "mtu",
        !          2216:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   2217:                       NULL, 0, &ip_mtu, 0,
                   2218:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2219:                       IPCTL_DEFMTU, CTL_EOL);
                   2220: #endif /* IPCTL_DEFMTU */
1.197     atatat   2221:        sysctl_createv(clog, 0, NULL, NULL,
                   2222:                       CTLFLAG_PERMANENT|CTLFLAG_READONLY1,
1.197.2.1! tron     2223:                       CTLTYPE_INT, "forwsrcrt",
        !          2224:                       SYSCTL_DESCR("Enable forwarding of source-routed "
        !          2225:                                    "datagrams"),
1.189     atatat   2226:                       NULL, 0, &ip_forwsrcrt, 0,
                   2227:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2228:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   2229:        sysctl_createv(clog, 0, NULL, NULL,
                   2230:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2231:                       CTLTYPE_INT, "directed-broadcast",
        !          2232:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   2233:                       NULL, 0, &ip_directedbcast, 0,
                   2234:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2235:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   2236:        sysctl_createv(clog, 0, NULL, NULL,
                   2237:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2238:                       CTLTYPE_INT, "allowsrcrt",
        !          2239:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   2240:                       NULL, 0, &ip_allowsrcrt, 0,
                   2241:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2242:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   2243:        sysctl_createv(clog, 0, NULL, NULL,
                   2244:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2245:                       CTLTYPE_INT, "subnetsarelocal",
        !          2246:                       SYSCTL_DESCR("Whether logical subnets are considered "
        !          2247:                                    "local"),
1.189     atatat   2248:                       NULL, 0, &subnetsarelocal, 0,
                   2249:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2250:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   2251:        sysctl_createv(clog, 0, NULL, NULL,
                   2252:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2253:                       CTLTYPE_INT, "mtudisc",
        !          2254:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   2255:                       NULL, 0, &ip_mtudisc, 0,
                   2256:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2257:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   2258:        sysctl_createv(clog, 0, NULL, NULL,
                   2259:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2260:                       CTLTYPE_INT, "anonportmin",
        !          2261:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   2262:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   2263:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2264:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   2265:        sysctl_createv(clog, 0, NULL, NULL,
                   2266:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2267:                       CTLTYPE_INT, "anonportmax",
        !          2268:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   2269:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   2270:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2271:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   2272:        sysctl_createv(clog, 0, NULL, NULL,
                   2273:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2274:                       CTLTYPE_INT, "mtudisctimeout",
        !          2275:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   2276:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   2277:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2278:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   2279: #ifdef GATEWAY
1.197     atatat   2280:        sysctl_createv(clog, 0, NULL, NULL,
                   2281:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2282:                       CTLTYPE_INT, "maxflows",
        !          2283:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   2284:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   2285:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2286:                       IPCTL_MAXFLOWS, CTL_EOL);
                   2287: #endif /* GATEWAY */
1.197     atatat   2288:        sysctl_createv(clog, 0, NULL, NULL,
                   2289:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2290:                       CTLTYPE_INT, "hostzerobroadcast",
        !          2291:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   2292:                       NULL, 0, &hostzeroisbroadcast, 0,
                   2293:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2294:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   2295: #if NGIF > 0
1.197     atatat   2296:        sysctl_createv(clog, 0, NULL, NULL,
                   2297:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2298:                       CTLTYPE_INT, "gifttl",
        !          2299:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   2300:                       NULL, 0, &ip_gif_ttl, 0,
                   2301:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2302:                       IPCTL_GIF_TTL, CTL_EOL);
                   2303: #endif /* NGIF */
                   2304: #ifndef IPNOPRIVPORTS
1.197     atatat   2305:        sysctl_createv(clog, 0, NULL, NULL,
                   2306:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2307:                       CTLTYPE_INT, "lowportmin",
        !          2308:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
        !          2309:                                    "to assign"),
1.189     atatat   2310:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   2311:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2312:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   2313:        sysctl_createv(clog, 0, NULL, NULL,
                   2314:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2315:                       CTLTYPE_INT, "lowportmax",
        !          2316:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
        !          2317:                                    "to assign"),
1.189     atatat   2318:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   2319:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2320:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   2321: #endif /* IPNOPRIVPORTS */
1.197     atatat   2322:        sysctl_createv(clog, 0, NULL, NULL,
                   2323:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2324:                       CTLTYPE_INT, "maxfragpackets",
        !          2325:                       SYSCTL_DESCR("Maximum number of fragments to retain for "
        !          2326:                                    "possible reassembly"),
1.189     atatat   2327:                       NULL, 0, &ip_maxfragpackets, 0,
                   2328:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2329:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
                   2330: #if NGRE > 0
1.197     atatat   2331:        sysctl_createv(clog, 0, NULL, NULL,
                   2332:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2333:                       CTLTYPE_INT, "grettl",
        !          2334:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   2335:                       NULL, 0, &ip_gre_ttl, 0,
                   2336:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2337:                       IPCTL_GRE_TTL, CTL_EOL);
                   2338: #endif /* NGRE */
1.197     atatat   2339:        sysctl_createv(clog, 0, NULL, NULL,
                   2340:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2341:                       CTLTYPE_INT, "checkinterface",
        !          2342:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
        !          2343:                                    "from RFC1122"),
1.189     atatat   2344:                       NULL, 0, &ip_checkinterface, 0,
                   2345:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2346:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   2347:        sysctl_createv(clog, 0, NULL, NULL,
                   2348:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.197.2.1! tron     2349:                       CTLTYPE_INT, "random_id",
        !          2350:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   2351:                       NULL, 0, &ip_do_randomid, 0,
                   2352:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2353:                       IPCTL_RANDOMID, CTL_EOL);
1.1       cgd      2354: }

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