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Annotation of src/sys/netinet/ip_input.c, Revision 1.284

1.284   ! pooka       1: /*     $NetBSD: ip_input.c,v 1.283 2009/07/17 18:09:25 minskim Exp $   */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.284   ! pooka      94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.283 2009/07/17 18:09:25 minskim Exp $");
1.55      scottr     95:
1.184     jonathan   96: #include "opt_inet.h"
1.278     christos   97: #include "opt_compat_netbsd.h"
1.62      matt       98: #include "opt_gateway.h"
1.69      mrg        99: #include "opt_pfil_hooks.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.1       cgd       104:
1.5       mycroft   105: #include <sys/param.h>
                    106: #include <sys/systm.h>
                    107: #include <sys/malloc.h>
                    108: #include <sys/mbuf.h>
                    109: #include <sys/domain.h>
                    110: #include <sys/protosw.h>
                    111: #include <sys/socket.h>
1.44      thorpej   112: #include <sys/socketvar.h>
1.5       mycroft   113: #include <sys/errno.h>
                    114: #include <sys/time.h>
                    115: #include <sys/kernel.h>
1.72      thorpej   116: #include <sys/pool.h>
1.28      christos  117: #include <sys/sysctl.h>
1.230     elad      118: #include <sys/kauth.h>
1.1       cgd       119:
1.5       mycroft   120: #include <net/if.h>
1.44      thorpej   121: #include <net/if_dl.h>
1.5       mycroft   122: #include <net/route.h>
1.45      mrg       123: #include <net/pfil.h>
1.1       cgd       124:
1.5       mycroft   125: #include <netinet/in.h>
                    126: #include <netinet/in_systm.h>
                    127: #include <netinet/ip.h>
                    128: #include <netinet/in_pcb.h>
1.215     yamt      129: #include <netinet/in_proto.h>
1.5       mycroft   130: #include <netinet/in_var.h>
                    131: #include <netinet/ip_var.h>
1.266     thorpej   132: #include <netinet/ip_private.h>
1.5       mycroft   133: #include <netinet/ip_icmp.h>
1.89      itojun    134: /* just for gif_ttl */
                    135: #include <netinet/in_gif.h>
                    136: #include "gif.h"
1.144     martin    137: #include <net/if_gre.h>
                    138: #include "gre.h"
1.111     jdolecek  139:
                    140: #ifdef MROUTING
                    141: #include <netinet/ip_mroute.h>
                    142: #endif
1.89      itojun    143:
                    144: #ifdef IPSEC
                    145: #include <netinet6/ipsec.h>
1.267     thorpej   146: #include <netinet6/ipsec_private.h>
1.89      itojun    147: #include <netkey/key.h>
                    148: #endif
1.173     jonathan  149: #ifdef FAST_IPSEC
                    150: #include <netipsec/ipsec.h>
                    151: #include <netipsec/key.h>
                    152: #endif /* FAST_IPSEC*/
1.44      thorpej   153:
1.1       cgd       154: #ifndef        IPFORWARDING
                    155: #ifdef GATEWAY
                    156: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    157: #else /* GATEWAY */
                    158: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    159: #endif /* GATEWAY */
                    160: #endif /* IPFORWARDING */
                    161: #ifndef        IPSENDREDIRECTS
                    162: #define        IPSENDREDIRECTS 1
                    163: #endif
1.26      thorpej   164: #ifndef IPFORWSRCRT
1.47      cjs       165: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    166: #endif
                    167: #ifndef IPALLOWSRCRT
1.48      mrg       168: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   169: #endif
1.53      kml       170: #ifndef IPMTUDISC
1.153     itojun    171: #define IPMTUDISC      1
1.53      kml       172: #endif
1.60      kml       173: #ifndef IPMTUDISCTIMEOUT
1.61      kml       174: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       175: #endif
1.53      kml       176:
1.278     christos  177: #ifdef COMPAT_50
                    178: #include <compat/sys/time.h>
                    179: #include <compat/sys/socket.h>
                    180: #endif
                    181:
1.27      thorpej   182: /*
                    183:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    184:  * configuration using this option will Just Work.
                    185:  */
                    186: #ifndef IPDIRECTEDBCAST
                    187: #ifdef DIRECTED_BROADCAST
                    188: #define IPDIRECTEDBCAST        1
                    189: #else
                    190: #define        IPDIRECTEDBCAST 0
                    191: #endif /* DIRECTED_BROADCAST */
                    192: #endif /* IPDIRECTEDBCAST */
1.1       cgd       193: int    ipforwarding = IPFORWARDING;
                    194: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   195: int    ip_defttl = IPDEFTTL;
1.26      thorpej   196: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   197: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       198: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       199: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    200: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       201: #ifdef DIAGNOSTIC
                    202: int    ipprintfs = 0;
                    203: #endif
1.184     jonathan  204:
                    205: int    ip_do_randomid = 0;
                    206:
1.165     christos  207: /*
                    208:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    209:  * the Strong ES model described in RFC 1122, but since the routing table
                    210:  * and transmit implementation do not implement the Strong ES model,
                    211:  * setting this to 1 results in an odd hybrid.
                    212:  *
                    213:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    214:  * to translate the destination address to another local interface.
                    215:  *
                    216:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    217:  * to the loopback interface instead of the interface where the
                    218:  * packets for those addresses are received.
                    219:  */
                    220: int    ip_checkinterface = 0;
                    221:
1.1       cgd       222:
1.60      kml       223: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    224:
1.1       cgd       225: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      226: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    227: int    in_ifaddrentries;                       /* total number of addrs */
1.212     perry     228: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       229: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      230: u_long in_multihash;                           /* size of hash table - 1 */
                    231: int    in_multientries;                        /* total number of addrs */
                    232: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   233: struct ifqueue ipintrq;
1.183     jonathan  234: uint16_t ip_id;
1.75      thorpej   235:
1.266     thorpej   236: percpu_t *ipstat_percpu;
                    237:
1.121     thorpej   238: #ifdef PFIL_HOOKS
                    239: struct pfil_head inet_pfil_hook;
                    240: #endif
                    241:
1.194     jonathan  242: /*
                    243:  * Cached copy of nmbclusters. If nbclusters is different,
                    244:  * recalculate IP parameters derived from nmbclusters.
                    245:  */
                    246: static int     ip_nmbclusters;                 /* copy of nmbclusters */
1.210     perry     247: static void    ip_nmbclusters_changed(void);   /* recalc limits */
1.194     jonathan  248:
1.195     thorpej   249: #define CHECK_NMBCLUSTER_PARAMS()                              \
                    250: do {                                                           \
                    251:        if (__predict_false(ip_nmbclusters != nmbclusters))     \
                    252:                ip_nmbclusters_changed();                       \
                    253: } while (/*CONSTCOND*/0)
1.194     jonathan  254:
1.190     jonathan  255: /* IP datagram reassembly queues (hashed) */
                    256: #define IPREASS_NHASH_LOG2      6
                    257: #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
                    258: #define IPREASS_HMASK           (IPREASS_NHASH - 1)
                    259: #define IPREASS_HASH(x,y) \
                    260:        (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
                    261: struct ipqhead ipq[IPREASS_NHASH];
1.75      thorpej   262: int    ipq_locked;
1.212     perry     263: static int     ip_nfragpackets;        /* packets in reass queue */
1.194     jonathan  264: static int     ip_nfrags;              /* total fragments in reass queues */
                    265:
                    266: int    ip_maxfragpackets = 200;        /* limit on packets. XXX sysctl */
                    267: int    ip_maxfrags;                    /* limit on fragments. XXX sysctl */
                    268:
                    269:
                    270: /*
                    271:  * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
                    272:  * IP reassembly queue buffer managment.
1.212     perry     273:  *
1.194     jonathan  274:  * We keep a count of total IP fragments (NB: not fragmented packets!)
                    275:  * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
                    276:  * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
                    277:  * total fragments in  reassembly queues.This AIMD policy avoids
                    278:  * repeatedly deleting single packets under heavy fragmentation load
                    279:  * (e.g., from lossy NFS peers).
                    280:  */
1.212     perry     281: static u_int   ip_reass_ttl_decr(u_int ticks);
1.210     perry     282: static void    ip_reass_drophalf(void);
1.194     jonathan  283:
1.75      thorpej   284:
1.223     perry     285: static inline int ipq_lock_try(void);
                    286: static inline void ipq_unlock(void);
1.75      thorpej   287:
1.223     perry     288: static inline int
1.211     perry     289: ipq_lock_try(void)
1.75      thorpej   290: {
                    291:        int s;
                    292:
1.132     thorpej   293:        /*
1.149     wiz       294:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   295:         * mbuf allocation.
                    296:         */
                    297:        s = splvm();
1.75      thorpej   298:        if (ipq_locked) {
                    299:                splx(s);
                    300:                return (0);
                    301:        }
                    302:        ipq_locked = 1;
                    303:        splx(s);
                    304:        return (1);
                    305: }
                    306:
1.223     perry     307: static inline void
1.211     perry     308: ipq_unlock(void)
1.75      thorpej   309: {
                    310:        int s;
                    311:
1.132     thorpej   312:        s = splvm();
1.75      thorpej   313:        ipq_locked = 0;
                    314:        splx(s);
                    315: }
                    316:
                    317: #ifdef DIAGNOSTIC
                    318: #define        IPQ_LOCK()                                                      \
                    319: do {                                                                   \
                    320:        if (ipq_lock_try() == 0) {                                      \
                    321:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    322:                panic("ipq_lock");                                      \
                    323:        }                                                               \
1.159     perry     324: } while (/*CONSTCOND*/ 0)
1.75      thorpej   325: #define        IPQ_LOCK_CHECK()                                                \
                    326: do {                                                                   \
                    327:        if (ipq_locked == 0) {                                          \
                    328:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    329:                panic("ipq lock check");                                \
                    330:        }                                                               \
1.159     perry     331: } while (/*CONSTCOND*/ 0)
1.75      thorpej   332: #else
                    333: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    334: #define        IPQ_LOCK_CHECK()        /* nothing */
                    335: #endif
                    336:
                    337: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       338:
1.275     pooka     339: struct pool inmulti_pool;
                    340: struct pool ipqent_pool;
1.72      thorpej   341:
1.135     thorpej   342: #ifdef INET_CSUM_COUNTERS
                    343: #include <sys/device.h>
                    344:
                    345: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    346:     NULL, "inet", "hwcsum bad");
                    347: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    348:     NULL, "inet", "hwcsum ok");
                    349: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    350:     NULL, "inet", "swcsum");
                    351:
                    352: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    353:
1.201     matt      354: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    355: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    356: EVCNT_ATTACH_STATIC(ip_swcsum);
                    357:
1.135     thorpej   358: #else
                    359:
                    360: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    361:
                    362: #endif /* INET_CSUM_COUNTERS */
                    363:
1.1       cgd       364: /*
                    365:  * We need to save the IP options in case a protocol wants to respond
                    366:  * to an incoming packet over the same route if the packet got here
                    367:  * using IP source routing.  This allows connection establishment and
                    368:  * maintenance when the remote end is on a network that is not known
                    369:  * to us.
                    370:  */
                    371: int    ip_nhops = 0;
                    372: static struct ip_srcrt {
                    373:        struct  in_addr dst;                    /* final destination */
                    374:        char    nop;                            /* one NOP to align */
                    375:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    376:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    377: } ip_srcrt;
                    378:
1.210     perry     379: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   380:
1.164     matt      381: #ifdef MBUFTRACE
1.234     dogcow    382: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    383: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      384: #endif
                    385:
1.284   ! pooka     386: static void sysctl_net_inet_ip_setup(struct sysctllog **);
        !           387:
1.1       cgd       388: /*
1.194     jonathan  389:  * Compute IP limits derived from the value of nmbclusters.
                    390:  */
                    391: static void
                    392: ip_nmbclusters_changed(void)
                    393: {
                    394:        ip_maxfrags = nmbclusters / 4;
                    395:        ip_nmbclusters =  nmbclusters;
                    396: }
                    397:
                    398: /*
1.1       cgd       399:  * IP initialization: fill in IP protocol switch table.
                    400:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    401:  */
1.8       mycroft   402: void
1.211     perry     403: ip_init(void)
1.1       cgd       404: {
1.199     matt      405:        const struct protosw *pr;
1.109     augustss  406:        int i;
1.1       cgd       407:
1.284   ! pooka     408:        sysctl_net_inet_ip_setup(NULL);
        !           409:
1.275     pooka     410:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    411:            NULL, IPL_SOFTNET);
                    412:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
                    413:            NULL, IPL_VM);
                    414:
1.1       cgd       415:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    416:        if (pr == 0)
                    417:                panic("ip_init");
                    418:        for (i = 0; i < IPPROTO_MAX; i++)
                    419:                ip_protox[i] = pr - inetsw;
                    420:        for (pr = inetdomain.dom_protosw;
                    421:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    422:                if (pr->pr_domain->dom_family == PF_INET &&
                    423:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    424:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  425:
1.190     jonathan  426:        for (i = 0; i < IPREASS_NHASH; i++)
                    427:                LIST_INIT(&ipq[i]);
                    428:
1.262     matt      429:        ip_initid();
1.227     kardel    430:        ip_id = time_second & 0xfffff;
1.194     jonathan  431:
1.1       cgd       432:        ipintrq.ifq_maxlen = ipqmaxlen;
1.194     jonathan  433:        ip_nmbclusters_changed();
                    434:
1.181     jonathan  435:        TAILQ_INIT(&in_ifaddrhead);
1.272     ad        436:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
                    437:            &in_ifaddrhash);
                    438:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
                    439:            &in_multihash);
1.160     itojun    440:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   441: #ifdef GATEWAY
1.248     liamjfoy  442:        ipflow_init(ip_hashsize);
1.73      thorpej   443: #endif
1.121     thorpej   444:
                    445: #ifdef PFIL_HOOKS
                    446:        /* Register our Packet Filter hook. */
1.126     thorpej   447:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    448:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   449:        i = pfil_head_register(&inet_pfil_hook);
                    450:        if (i != 0)
                    451:                printf("ip_init: WARNING: unable to register pfil hook, "
                    452:                    "error %d\n", i);
                    453: #endif /* PFIL_HOOKS */
1.135     thorpej   454:
1.164     matt      455: #ifdef MBUFTRACE
                    456:        MOWNER_ATTACH(&ip_tx_mowner);
                    457:        MOWNER_ATTACH(&ip_rx_mowner);
                    458: #endif /* MBUFTRACE */
1.266     thorpej   459:
                    460:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       461: }
                    462:
1.229     christos  463: struct sockaddr_in ipaddr = {
                    464:        .sin_len = sizeof(ipaddr),
                    465:        .sin_family = AF_INET,
                    466: };
1.1       cgd       467: struct route ipforward_rt;
                    468:
                    469: /*
1.89      itojun    470:  * IP software interrupt routine
                    471:  */
                    472: void
1.211     perry     473: ipintr(void)
1.89      itojun    474: {
                    475:        int s;
                    476:        struct mbuf *m;
                    477:
1.268     ad        478:        mutex_enter(softnet_lock);
                    479:        KERNEL_LOCK(1, NULL);
1.241     ad        480:        while (!IF_IS_EMPTY(&ipintrq)) {
1.132     thorpej   481:                s = splnet();
1.89      itojun    482:                IF_DEQUEUE(&ipintrq, m);
                    483:                splx(s);
1.268     ad        484:                if (m == NULL)
                    485:                        break;
1.89      itojun    486:                ip_input(m);
                    487:        }
1.268     ad        488:        KERNEL_UNLOCK_ONE(NULL);
                    489:        mutex_exit(softnet_lock);
1.89      itojun    490: }
                    491:
                    492: /*
1.1       cgd       493:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    494:  * try to reassemble.  Process options.  Pass to next level.
                    495:  */
1.8       mycroft   496: void
1.89      itojun    497: ip_input(struct mbuf *m)
1.1       cgd       498: {
1.109     augustss  499:        struct ip *ip = NULL;
                    500:        struct ipq *fp;
                    501:        struct in_ifaddr *ia;
                    502:        struct ifaddr *ifa;
1.25      cgd       503:        struct ipqent *ipqe;
1.89      itojun    504:        int hlen = 0, mff, len;
1.100     itojun    505:        int downmatch;
1.165     christos  506:        int checkif;
1.169     itojun    507:        int srcrt = 0;
1.233     tls       508:        int s;
1.190     jonathan  509:        u_int hash;
1.173     jonathan  510: #ifdef FAST_IPSEC
                    511:        struct m_tag *mtag;
                    512:        struct tdb_ident *tdbi;
                    513:        struct secpolicy *sp;
1.233     tls       514:        int error;
1.173     jonathan  515: #endif /* FAST_IPSEC */
1.1       cgd       516:
1.164     matt      517:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       518: #ifdef DIAGNOSTIC
                    519:        if ((m->m_flags & M_PKTHDR) == 0)
                    520:                panic("ipintr no HDR");
1.89      itojun    521: #endif
1.164     matt      522:
1.1       cgd       523:        /*
                    524:         * If no IP addresses have been set yet but the interfaces
                    525:         * are receiving, can't do anything with incoming packets yet.
                    526:         */
1.181     jonathan  527:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       528:                goto bad;
1.266     thorpej   529:        IP_STATINC(IP_STAT_TOTAL);
1.154     thorpej   530:        /*
                    531:         * If the IP header is not aligned, slurp it up into a new
                    532:         * mbuf with space for link headers, in the event we forward
                    533:         * it.  Otherwise, if it is aligned, make sure the entire
                    534:         * base IP header is in the first mbuf of the chain.
                    535:         */
1.244     christos  536:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   537:                if ((m = m_copyup(m, sizeof(struct ip),
                    538:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    539:                        /* XXXJRT new stat, please */
1.266     thorpej   540:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   541:                        return;
                    542:                }
                    543:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    544:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   545:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   546:                        return;
                    547:                }
1.1       cgd       548:        }
                    549:        ip = mtod(m, struct ip *);
1.13      mycroft   550:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   551:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   552:                goto bad;
                    553:        }
1.1       cgd       554:        hlen = ip->ip_hl << 2;
                    555:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   556:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       557:                goto bad;
                    558:        }
                    559:        if (hlen > m->m_len) {
                    560:                if ((m = m_pullup(m, hlen)) == 0) {
1.266     thorpej   561:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    562:                        return;
1.1       cgd       563:                }
                    564:                ip = mtod(m, struct ip *);
                    565:        }
1.98      thorpej   566:
1.85      hwr       567:        /*
1.99      thorpej   568:         * RFC1122: packets with a multicast source address are
1.98      thorpej   569:         * not allowed.
1.85      hwr       570:         */
                    571:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   572:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       573:                goto bad;
1.129     itojun    574:        }
                    575:
                    576:        /* 127/8 must not appear on wire - RFC1122 */
                    577:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    578:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    579:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   580:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    581:                        goto bad;
1.130     itojun    582:                }
1.85      hwr       583:        }
                    584:
1.135     thorpej   585:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   586:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   587:                 M_CSUM_IPv4_BAD)) {
                    588:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    589:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    590:                goto badcsum;
                    591:
                    592:        case M_CSUM_IPv4:
                    593:                /* Checksum was okay. */
                    594:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    595:                break;
                    596:
                    597:        default:
1.206     thorpej   598:                /*
                    599:                 * Must compute it ourselves.  Maybe skip checksum on
                    600:                 * loopback interfaces.
                    601:                 */
                    602:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    603:                                     IFF_LOOPBACK) || ip_do_loopback_cksum)) {
                    604:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    605:                        if (in_cksum(m, hlen) != 0)
                    606:                                goto badcsum;
                    607:                }
1.135     thorpej   608:                break;
1.1       cgd       609:        }
                    610:
1.121     thorpej   611:        /* Retrieve the packet length. */
                    612:        len = ntohs(ip->ip_len);
1.81      proff     613:
                    614:        /*
                    615:         * Check for additional length bogosity
                    616:         */
1.84      proff     617:        if (len < hlen) {
1.266     thorpej   618:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     619:                goto bad;
                    620:        }
1.1       cgd       621:
                    622:        /*
                    623:         * Check that the amount of data in the buffers
                    624:         * is as at least much as the IP header would have us expect.
                    625:         * Trim mbufs if longer than we expect.
                    626:         * Drop packet if shorter than we expect.
                    627:         */
1.35      mycroft   628:        if (m->m_pkthdr.len < len) {
1.266     thorpej   629:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       630:                goto bad;
                    631:        }
1.35      mycroft   632:        if (m->m_pkthdr.len > len) {
1.1       cgd       633:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   634:                        m->m_len = len;
                    635:                        m->m_pkthdr.len = len;
1.1       cgd       636:                } else
1.35      mycroft   637:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       638:        }
                    639:
1.193     scw       640: #if defined(IPSEC)
1.149     wiz       641:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    642:        m->m_flags &= ~M_CANFASTFWD;
                    643: #else
1.64      thorpej   644:        /*
                    645:         * Assume that we can create a fast-forward IP flow entry
                    646:         * based on this packet.
                    647:         */
                    648:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    649: #endif
1.64      thorpej   650:
1.36      mrg       651: #ifdef PFIL_HOOKS
1.33      mrg       652:        /*
1.64      thorpej   653:         * Run through list of hooks for input packets.  If there are any
                    654:         * filters which require that additional packets in the flow are
                    655:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    656:         * Note that filters must _never_ set this flag, as another filter
                    657:         * in the list may have previously cleared it.
1.33      mrg       658:         */
1.127     itojun    659:        /*
                    660:         * let ipfilter look at packet on the wire,
                    661:         * not the decapsulated packet.
                    662:         */
                    663: #ifdef IPSEC
1.136     itojun    664:        if (!ipsec_getnhist(m))
1.186     scw       665: #elif defined(FAST_IPSEC)
                    666:        if (!ipsec_indone(m))
1.127     itojun    667: #else
                    668:        if (1)
                    669: #endif
                    670:        {
1.169     itojun    671:                struct in_addr odst;
                    672:
                    673:                odst = ip->ip_dst;
1.127     itojun    674:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    675:                    PFIL_IN) != 0)
                    676:                        return;
1.127     itojun    677:                if (m == NULL)
                    678:                        return;
                    679:                ip = mtod(m, struct ip *);
1.142     darrenr   680:                hlen = ip->ip_hl << 2;
1.205     darrenr   681:                /*
                    682:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    683:                 * from generating ICMP redirects for packets that have
                    684:                 * been redirected by a hook back out on to the same LAN that
                    685:                 * they came from and is not an indication that the packet
                    686:                 * is being inffluenced by source routing options.  This
                    687:                 * allows things like
                    688:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    689:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    690:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    691:                 * also requires a "map tlp0 ..." to complete the story.
                    692:                 * One might argue whether or not this kind of network config.
1.212     perry     693:                 * should be supported in this manner...
1.205     darrenr   694:                 */
1.169     itojun    695:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    696:        }
1.36      mrg       697: #endif /* PFIL_HOOKS */
1.123     thorpej   698:
                    699: #ifdef ALTQ
                    700:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    701:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    702:                /* packet dropped by traffic conditioner */
                    703:                return;
                    704:        }
                    705: #endif
1.121     thorpej   706:
                    707:        /*
1.1       cgd       708:         * Process options and, if not destined for us,
                    709:         * ship it on.  ip_dooptions returns 1 when an
                    710:         * error was detected (causing an icmp message
                    711:         * to be sent and the original packet to be freed).
                    712:         */
                    713:        ip_nhops = 0;           /* for source routed packets */
                    714:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    715:                return;
1.1       cgd       716:
                    717:        /*
1.165     christos  718:         * Enable a consistency check between the destination address
                    719:         * and the arrival interface for a unicast packet (the RFC 1122
                    720:         * strong ES model) if IP forwarding is disabled and the packet
                    721:         * is not locally generated.
                    722:         *
                    723:         * XXX - Checking also should be disabled if the destination
                    724:         * address is ipnat'ed to a different interface.
                    725:         *
                    726:         * XXX - Checking is incompatible with IP aliases added
                    727:         * to the loopback interface instead of the interface where
                    728:         * the packets are received.
                    729:         *
                    730:         * XXX - We need to add a per ifaddr flag for this so that
                    731:         * we get finer grain control.
                    732:         */
                    733:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    734:            (m->m_pkthdr.rcvif != NULL) &&
                    735:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    736:
                    737:        /*
1.1       cgd       738:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    739:         *
                    740:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    741:         * The behavior here is to treat addresses on !IFF_UP interface
                    742:         * as not mine.
1.1       cgd       743:         */
1.100     itojun    744:        downmatch = 0;
1.140     matt      745:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    746:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  747:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    748:                                continue;
1.97      itojun    749:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    750:                                break;
1.100     itojun    751:                        else
                    752:                                downmatch++;
1.97      itojun    753:                }
                    754:        }
1.86      thorpej   755:        if (ia != NULL)
                    756:                goto ours;
1.225     christos  757:        if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209     matt      758:                IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140     matt      759:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    760:                                continue;
1.57      tls       761:                        ia = ifatoia(ifa);
1.35      mycroft   762:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    763:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   764:                            /*
                    765:                             * Look for all-0's host part (old broadcast addr),
                    766:                             * either for subnet or net.
                    767:                             */
                    768:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   769:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       770:                                goto ours;
1.57      tls       771:                        /*
                    772:                         * An interface with IP address zero accepts
                    773:                         * all packets that arrive on that interface.
                    774:                         */
                    775:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    776:                                goto ours;
1.1       cgd       777:                }
                    778:        }
1.18      mycroft   779:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   780:                struct in_multi *inm;
                    781: #ifdef MROUTING
                    782:                extern struct socket *ip_mrouter;
1.10      brezak    783:
1.4       hpeyerl   784:                if (ip_mrouter) {
                    785:                        /*
                    786:                         * If we are acting as a multicast router, all
                    787:                         * incoming multicast packets are passed to the
                    788:                         * kernel-level multicast forwarding function.
                    789:                         * The packet is returned (relatively) intact; if
                    790:                         * ip_mforward() returns a non-zero value, the packet
                    791:                         * must be discarded, else it may be accepted below.
                    792:                         *
                    793:                         * (The IP ident field is put in the same byte order
                    794:                         * as expected when ip_mforward() is called from
                    795:                         * ip_output().)
                    796:                         */
1.13      mycroft   797:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266     thorpej   798:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   799:                                m_freem(m);
1.89      itojun    800:                                return;
1.4       hpeyerl   801:                        }
                    802:
                    803:                        /*
                    804:                         * The process-level routing demon needs to receive
                    805:                         * all multicast IGMP packets, whether or not this
                    806:                         * host belongs to their destination groups.
                    807:                         */
                    808:                        if (ip->ip_p == IPPROTO_IGMP)
                    809:                                goto ours;
1.266     thorpej   810:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   811:                }
                    812: #endif
                    813:                /*
                    814:                 * See if we belong to the destination multicast group on the
                    815:                 * arrival interface.
                    816:                 */
                    817:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    818:                if (inm == NULL) {
1.266     thorpej   819:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   820:                        m_freem(m);
1.89      itojun    821:                        return;
1.4       hpeyerl   822:                }
                    823:                goto ours;
                    824:        }
1.19      mycroft   825:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   826:            in_nullhost(ip->ip_dst))
1.1       cgd       827:                goto ours;
                    828:
                    829:        /*
                    830:         * Not for us; forward if possible and desirable.
                    831:         */
                    832:        if (ipforwarding == 0) {
1.266     thorpej   833:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       834:                m_freem(m);
1.100     itojun    835:        } else {
                    836:                /*
                    837:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    838:                 * and there's no IFF_UP interface that matches ip_dst,
                    839:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    840:                 * forwarding loop till TTL goes to 0.
                    841:                 */
                    842:                if (downmatch) {
                    843:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   844:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    845:                        return;
                    846:                }
1.145     itojun    847: #ifdef IPSEC
                    848:                if (ipsec4_in_reject(m, NULL)) {
1.267     thorpej   849:                        IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145     itojun    850:                        goto bad;
                    851:                }
                    852: #endif
1.173     jonathan  853: #ifdef FAST_IPSEC
                    854:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    855:                s = splsoftnet();
                    856:                if (mtag != NULL) {
                    857:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    858:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    859:                } else {
                    860:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     861:                                                   IP_FORWARDING, &error);
1.173     jonathan  862:                }
                    863:                if (sp == NULL) {       /* NB: can happen if error */
                    864:                        splx(s);
                    865:                        /*XXX error stat???*/
                    866:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    867:                        goto bad;
                    868:                }
                    869:
                    870:                /*
                    871:                 * Check security policy against packet attributes.
                    872:                 */
                    873:                error = ipsec_in_reject(sp, m);
                    874:                KEY_FREESP(&sp);
                    875:                splx(s);
                    876:                if (error) {
1.266     thorpej   877:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.173     jonathan  878:                        goto bad;
1.193     scw       879:                }
                    880:
                    881:                /*
                    882:                 * Peek at the outbound SP for this packet to determine if
                    883:                 * it's a Fast Forward candidate.
                    884:                 */
                    885:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    886:                if (mtag != NULL)
                    887:                        m->m_flags &= ~M_CANFASTFWD;
                    888:                else {
                    889:                        s = splsoftnet();
                    890:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    891:                            (IP_FORWARDING |
                    892:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    893:                            &error, NULL);
                    894:                        if (sp != NULL) {
                    895:                                m->m_flags &= ~M_CANFASTFWD;
                    896:                                KEY_FREESP(&sp);
                    897:                        }
                    898:                        splx(s);
1.173     jonathan  899:                }
                    900: #endif /* FAST_IPSEC */
1.145     itojun    901:
1.169     itojun    902:                ip_forward(m, srcrt);
1.100     itojun    903:        }
1.89      itojun    904:        return;
1.1       cgd       905:
                    906: ours:
                    907:        /*
                    908:         * If offset or IP_MF are set, must reassemble.
                    909:         * Otherwise, nothing need be done.
                    910:         * (We could look in the reassembly queue to see
                    911:         * if the packet was previously fragmented,
                    912:         * but it's not worth the time; just let them time out.)
                    913:         */
1.155     itojun    914:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258     matt      915:                uint16_t off;
                    916:                /*
                    917:                 * Prevent TCP blind data attacks by not allowing non-initial
                    918:                 * fragments to start at less than 68 bytes (minimal fragment
1.259     matt      919:                 * size) and making sure the first fragment is at least 68
                    920:                 * bytes.
1.258     matt      921:                 */
1.260     matt      922:                off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259     matt      923:                if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266     thorpej   924:                        IP_STATINC(IP_STAT_BADFRAGS);
1.258     matt      925:                        goto bad;
                    926:                }
1.1       cgd       927:                /*
                    928:                 * Look for queue of fragments
                    929:                 * of this datagram.
                    930:                 */
1.75      thorpej   931:                IPQ_LOCK();
1.190     jonathan  932:                hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250     dyoung    933:                LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1       cgd       934:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   935:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    936:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260     matt      937:                            ip->ip_p == fp->ipq_p) {
                    938:                                /*
                    939:                                 * Make sure the TOS is matches previous
                    940:                                 * fragments.
                    941:                                 */
                    942:                                if (ip->ip_tos != fp->ipq_tos) {
1.266     thorpej   943:                                        IP_STATINC(IP_STAT_BADFRAGS);
1.276     rmind     944:                                        IPQ_UNLOCK();
1.260     matt      945:                                        goto bad;
                    946:                                }
1.1       cgd       947:                                goto found;
1.260     matt      948:                        }
1.190     jonathan  949:                }
1.1       cgd       950:                fp = 0;
                    951: found:
                    952:
                    953:                /*
                    954:                 * Adjust ip_len to not reflect header,
1.25      cgd       955:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       956:                 * convert offset of this to bytes.
                    957:                 */
1.155     itojun    958:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    959:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       960:                if (mff) {
1.16      cgd       961:                        /*
                    962:                         * Make sure that fragments have a data length
                    963:                         * that's a non-zero multiple of 8 bytes.
                    964:                         */
1.155     itojun    965:                        if (ntohs(ip->ip_len) == 0 ||
                    966:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.266     thorpej   967:                                IP_STATINC(IP_STAT_BADFRAGS);
1.75      thorpej   968:                                IPQ_UNLOCK();
1.16      cgd       969:                                goto bad;
                    970:                        }
                    971:                }
1.155     itojun    972:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       973:
                    974:                /*
                    975:                 * If datagram marked as having more fragments
                    976:                 * or if this is not the first fragment,
                    977:                 * attempt reassembly; if it succeeds, proceed.
                    978:                 */
1.155     itojun    979:                if (mff || ip->ip_off != htons(0)) {
1.266     thorpej   980:                        IP_STATINC(IP_STAT_FRAGMENTS);
1.233     tls       981:                        s = splvm();
1.72      thorpej   982:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233     tls       983:                        splx(s);
1.25      cgd       984:                        if (ipqe == NULL) {
1.266     thorpej   985:                                IP_STATINC(IP_STAT_RCVMEMDROP);
1.75      thorpej   986:                                IPQ_UNLOCK();
1.25      cgd       987:                                goto bad;
                    988:                        }
                    989:                        ipqe->ipqe_mff = mff;
1.50      thorpej   990:                        ipqe->ipqe_m = m;
1.25      cgd       991:                        ipqe->ipqe_ip = ip;
1.190     jonathan  992:                        m = ip_reass(ipqe, fp, &ipq[hash]);
1.75      thorpej   993:                        if (m == 0) {
                    994:                                IPQ_UNLOCK();
1.89      itojun    995:                                return;
1.75      thorpej   996:                        }
1.266     thorpej   997:                        IP_STATINC(IP_STAT_REASSEMBLED);
1.50      thorpej   998:                        ip = mtod(m, struct ip *);
1.74      thorpej   999:                        hlen = ip->ip_hl << 2;
1.155     itojun   1000:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd      1001:                } else
                   1002:                        if (fp)
                   1003:                                ip_freef(fp);
1.75      thorpej  1004:                IPQ_UNLOCK();
1.79      mycroft  1005:        }
1.128     itojun   1006:
1.173     jonathan 1007: #if defined(IPSEC)
1.128     itojun   1008:        /*
                   1009:         * enforce IPsec policy checking if we are seeing last header.
                   1010:         * note that we do not visit this with protocols with pcb layer
                   1011:         * code - like udp/tcp/raw ip.
                   1012:         */
                   1013:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                   1014:            ipsec4_in_reject(m, NULL)) {
1.267     thorpej  1015:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128     itojun   1016:                goto bad;
                   1017:        }
                   1018: #endif
1.226     liamjfoy 1019: #ifdef FAST_IPSEC
1.173     jonathan 1020:        /*
                   1021:         * enforce IPsec policy checking if we are seeing last header.
                   1022:         * note that we do not visit this with protocols with pcb layer
                   1023:         * code - like udp/tcp/raw ip.
                   1024:         */
                   1025:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                   1026:                /*
                   1027:                 * Check if the packet has already had IPsec processing
                   1028:                 * done.  If so, then just pass it along.  This tag gets
                   1029:                 * set during AH, ESP, etc. input handling, before the
                   1030:                 * packet is returned to the ip input queue for delivery.
1.212     perry    1031:                 */
1.173     jonathan 1032:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                   1033:                s = splsoftnet();
                   1034:                if (mtag != NULL) {
                   1035:                        tdbi = (struct tdb_ident *)(mtag + 1);
                   1036:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                   1037:                } else {
                   1038:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry    1039:                                                   IP_FORWARDING, &error);
1.173     jonathan 1040:                }
                   1041:                if (sp != NULL) {
                   1042:                        /*
                   1043:                         * Check security policy against packet attributes.
                   1044:                         */
                   1045:                        error = ipsec_in_reject(sp, m);
                   1046:                        KEY_FREESP(&sp);
                   1047:                } else {
                   1048:                        /* XXX error stat??? */
                   1049:                        error = EINVAL;
                   1050: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                   1051:                }
                   1052:                splx(s);
                   1053:                if (error)
                   1054:                        goto bad;
                   1055:        }
                   1056: #endif /* FAST_IPSEC */
1.1       cgd      1057:
                   1058:        /*
                   1059:         * Switch out to protocol's input routine.
                   1060:         */
1.82      aidan    1061: #if IFA_STATS
1.122     itojun   1062:        if (ia && ip)
1.155     itojun   1063:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan    1064: #endif
1.266     thorpej  1065:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun   1066:     {
                   1067:        int off = hlen, nh = ip->ip_p;
                   1068:
                   1069:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                   1070:        return;
                   1071:     }
1.1       cgd      1072: bad:
                   1073:        m_freem(m);
1.135     thorpej  1074:        return;
                   1075:
                   1076: badcsum:
1.266     thorpej  1077:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej  1078:        m_freem(m);
1.1       cgd      1079: }
                   1080:
                   1081: /*
                   1082:  * Take incoming datagram fragment and try to
                   1083:  * reassemble it into whole datagram.  If a chain for
                   1084:  * reassembly of this datagram already exists, then it
                   1085:  * is given as fp; otherwise have to make a chain.
                   1086:  */
1.50      thorpej  1087: struct mbuf *
1.211     perry    1088: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1       cgd      1089: {
1.109     augustss 1090:        struct mbuf *m = ipqe->ipqe_m;
                   1091:        struct ipqent *nq, *p, *q;
1.25      cgd      1092:        struct ip *ip;
1.1       cgd      1093:        struct mbuf *t;
1.25      cgd      1094:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233     tls      1095:        int i, next, s;
1.1       cgd      1096:
1.75      thorpej  1097:        IPQ_LOCK_CHECK();
                   1098:
1.1       cgd      1099:        /*
                   1100:         * Presence of header sizes in mbufs
                   1101:         * would confuse code below.
                   1102:         */
                   1103:        m->m_data += hlen;
                   1104:        m->m_len -= hlen;
                   1105:
1.194     jonathan 1106: #ifdef notyet
                   1107:        /* make sure fragment limit is up-to-date */
                   1108:        CHECK_NMBCLUSTER_PARAMS();
                   1109:
                   1110:        /* If we have too many fragments, drop the older half. */
                   1111:        if (ip_nfrags >= ip_maxfrags)
                   1112:                ip_reass_drophalf(void);
                   1113: #endif
                   1114:
1.1       cgd      1115:        /*
1.192     jonathan 1116:         * We are about to add a fragment; increment frag count.
                   1117:         */
                   1118:        ip_nfrags++;
1.212     perry    1119:
1.192     jonathan 1120:        /*
1.1       cgd      1121:         * If first fragment to arrive, create a reassembly queue.
                   1122:         */
                   1123:        if (fp == 0) {
1.131     itojun   1124:                /*
                   1125:                 * Enforce upper bound on number of fragmented packets
                   1126:                 * for which we attempt reassembly;
                   1127:                 * If maxfrag is 0, never accept fragments.
                   1128:                 * If maxfrag is -1, accept all fragments without limitation.
                   1129:                 */
                   1130:                if (ip_maxfragpackets < 0)
                   1131:                        ;
                   1132:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1133:                        goto dropfrag;
                   1134:                ip_nfragpackets++;
1.277     cegger   1135:                fp = malloc(sizeof (struct ipq), M_FTABLE, M_NOWAIT);
1.50      thorpej  1136:                if (fp == NULL)
1.1       cgd      1137:                        goto dropfrag;
1.190     jonathan 1138:                LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192     jonathan 1139:                fp->ipq_nfrags = 1;
1.1       cgd      1140:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1141:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1142:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260     matt     1143:                fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148     matt     1144:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1145:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1146:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1147:                p = NULL;
1.1       cgd      1148:                goto insert;
1.192     jonathan 1149:        } else {
                   1150:                fp->ipq_nfrags++;
1.1       cgd      1151:        }
                   1152:
                   1153:        /*
                   1154:         * Find a segment which begins after this one does.
                   1155:         */
1.148     matt     1156:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1157:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1158:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1159:                        break;
                   1160:
                   1161:        /*
                   1162:         * If there is a preceding segment, it may provide some of
                   1163:         * our data already.  If so, drop the data from the incoming
                   1164:         * segment.  If it provides all of our data, drop us.
                   1165:         */
1.25      cgd      1166:        if (p != NULL) {
1.155     itojun   1167:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1168:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1169:                if (i > 0) {
1.155     itojun   1170:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1171:                                goto dropfrag;
1.50      thorpej  1172:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1173:                        ipqe->ipqe_ip->ip_off =
                   1174:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1175:                        ipqe->ipqe_ip->ip_len =
                   1176:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1177:                }
                   1178:        }
                   1179:
                   1180:        /*
                   1181:         * While we overlap succeeding segments trim them or,
                   1182:         * if they are completely covered, dequeue them.
                   1183:         */
1.155     itojun   1184:        for (; q != NULL &&
                   1185:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1186:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1187:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1188:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1189:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1190:                        q->ipqe_ip->ip_len =
                   1191:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1192:                        q->ipqe_ip->ip_off =
                   1193:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1194:                        m_adj(q->ipqe_m, i);
1.1       cgd      1195:                        break;
                   1196:                }
1.148     matt     1197:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1198:                m_freem(q->ipqe_m);
1.148     matt     1199:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1200:                s = splvm();
1.72      thorpej  1201:                pool_put(&ipqent_pool, q);
1.233     tls      1202:                splx(s);
1.192     jonathan 1203:                fp->ipq_nfrags--;
                   1204:                ip_nfrags--;
1.1       cgd      1205:        }
                   1206:
                   1207: insert:
                   1208:        /*
                   1209:         * Stick new segment in its place;
                   1210:         * check for complete reassembly.
                   1211:         */
1.25      cgd      1212:        if (p == NULL) {
1.148     matt     1213:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1214:        } else {
1.148     matt     1215:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1216:        }
1.1       cgd      1217:        next = 0;
1.148     matt     1218:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1219:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1220:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1221:                        return (0);
1.155     itojun   1222:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1223:        }
1.25      cgd      1224:        if (p->ipqe_mff)
1.1       cgd      1225:                return (0);
                   1226:
                   1227:        /*
1.41      thorpej  1228:         * Reassembly is complete.  Check for a bogus message size and
                   1229:         * concatenate fragments.
1.1       cgd      1230:         */
1.148     matt     1231:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1232:        ip = q->ipqe_ip;
1.41      thorpej  1233:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266     thorpej  1234:                IP_STATINC(IP_STAT_TOOLONG);
1.41      thorpej  1235:                ip_freef(fp);
                   1236:                return (0);
                   1237:        }
1.50      thorpej  1238:        m = q->ipqe_m;
1.1       cgd      1239:        t = m->m_next;
                   1240:        m->m_next = 0;
                   1241:        m_cat(m, t);
1.148     matt     1242:        nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1243:        s = splvm();
1.72      thorpej  1244:        pool_put(&ipqent_pool, q);
1.233     tls      1245:        splx(s);
1.25      cgd      1246:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1247:                t = q->ipqe_m;
1.148     matt     1248:                nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1249:                s = splvm();
1.72      thorpej  1250:                pool_put(&ipqent_pool, q);
1.233     tls      1251:                splx(s);
1.1       cgd      1252:                m_cat(m, t);
                   1253:        }
1.192     jonathan 1254:        ip_nfrags -= fp->ipq_nfrags;
1.1       cgd      1255:
                   1256:        /*
                   1257:         * Create header for new ip packet by
                   1258:         * modifying header of first packet;
                   1259:         * dequeue and discard fragment reassembly header.
                   1260:         * Make header visible.
                   1261:         */
1.155     itojun   1262:        ip->ip_len = htons(next);
1.25      cgd      1263:        ip->ip_src = fp->ipq_src;
                   1264:        ip->ip_dst = fp->ipq_dst;
                   1265:        LIST_REMOVE(fp, ipq_q);
1.277     cegger   1266:        free(fp, M_FTABLE);
1.131     itojun   1267:        ip_nfragpackets--;
1.1       cgd      1268:        m->m_len += (ip->ip_hl << 2);
                   1269:        m->m_data -= (ip->ip_hl << 2);
                   1270:        /* some debugging cruft by sklower, below, will go away soon */
                   1271:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1272:                int plen = 0;
1.50      thorpej  1273:                for (t = m; t; t = t->m_next)
                   1274:                        plen += t->m_len;
                   1275:                m->m_pkthdr.len = plen;
1.213     yamt     1276:                m->m_pkthdr.csum_flags = 0;
1.1       cgd      1277:        }
1.50      thorpej  1278:        return (m);
1.1       cgd      1279:
                   1280: dropfrag:
1.192     jonathan 1281:        if (fp != 0)
                   1282:                fp->ipq_nfrags--;
                   1283:        ip_nfrags--;
1.266     thorpej  1284:        IP_STATINC(IP_STAT_FRAGDROPPED);
1.1       cgd      1285:        m_freem(m);
1.233     tls      1286:        s = splvm();
1.72      thorpej  1287:        pool_put(&ipqent_pool, ipqe);
1.233     tls      1288:        splx(s);
1.1       cgd      1289:        return (0);
                   1290: }
                   1291:
                   1292: /*
                   1293:  * Free a fragment reassembly header and all
                   1294:  * associated datagrams.
                   1295:  */
1.8       mycroft  1296: void
1.211     perry    1297: ip_freef(struct ipq *fp)
1.1       cgd      1298: {
1.109     augustss 1299:        struct ipqent *q, *p;
1.192     jonathan 1300:        u_int nfrags = 0;
1.233     tls      1301:        int s;
1.1       cgd      1302:
1.75      thorpej  1303:        IPQ_LOCK_CHECK();
                   1304:
1.148     matt     1305:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1306:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1307:                m_freem(q->ipqe_m);
1.192     jonathan 1308:                nfrags++;
1.148     matt     1309:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1310:                s = splvm();
1.72      thorpej  1311:                pool_put(&ipqent_pool, q);
1.233     tls      1312:                splx(s);
1.1       cgd      1313:        }
1.192     jonathan 1314:
                   1315:        if (nfrags != fp->ipq_nfrags)
                   1316:            printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
                   1317:        ip_nfrags -= nfrags;
1.25      cgd      1318:        LIST_REMOVE(fp, ipq_q);
1.277     cegger   1319:        free(fp, M_FTABLE);
1.131     itojun   1320:        ip_nfragpackets--;
1.1       cgd      1321: }
                   1322:
                   1323: /*
1.194     jonathan 1324:  * IP reassembly TTL machinery for  multiplicative drop.
                   1325:  */
                   1326: static u_int   fragttl_histo[(IPFRAGTTL+1)];
                   1327:
                   1328:
                   1329: /*
                   1330:  * Decrement TTL of all reasembly queue entries by `ticks'.
                   1331:  * Count number of distinct fragments (as opposed to partial, fragmented
                   1332:  * datagrams) in the reassembly queue.  While we  traverse the entire
                   1333:  * reassembly queue, compute and return the median TTL over all fragments.
                   1334:  */
                   1335: static u_int
                   1336: ip_reass_ttl_decr(u_int ticks)
                   1337: {
1.198     matt     1338:        u_int nfrags, median, dropfraction, keepfraction;
1.194     jonathan 1339:        struct ipq *fp, *nfp;
1.198     matt     1340:        int i;
1.212     perry    1341:
1.194     jonathan 1342:        nfrags = 0;
                   1343:        memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212     perry    1344:
1.194     jonathan 1345:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1346:                for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
                   1347:                        fp->ipq_ttl = ((fp->ipq_ttl  <= ticks) ?
                   1348:                                       0 : fp->ipq_ttl - ticks);
                   1349:                        nfp = LIST_NEXT(fp, ipq_q);
                   1350:                        if (fp->ipq_ttl == 0) {
1.266     thorpej  1351:                                IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194     jonathan 1352:                                ip_freef(fp);
                   1353:                        } else {
                   1354:                                nfrags += fp->ipq_nfrags;
                   1355:                                fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
                   1356:                        }
                   1357:                }
                   1358:        }
                   1359:
                   1360:        KASSERT(ip_nfrags == nfrags);
                   1361:
                   1362:        /* Find median (or other drop fraction) in histogram. */
                   1363:        dropfraction = (ip_nfrags / 2);
                   1364:        keepfraction = ip_nfrags - dropfraction;
                   1365:        for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
                   1366:                median +=  fragttl_histo[i];
                   1367:                if (median >= keepfraction)
                   1368:                        break;
                   1369:        }
                   1370:
                   1371:        /* Return TTL of median (or other fraction). */
                   1372:        return (u_int)i;
                   1373: }
                   1374:
                   1375: void
                   1376: ip_reass_drophalf(void)
                   1377: {
                   1378:
                   1379:        u_int median_ticks;
                   1380:        /*
                   1381:         * Compute median TTL of all fragments, and count frags
                   1382:         * with that TTL or lower (roughly half of all fragments).
                   1383:         */
                   1384:        median_ticks = ip_reass_ttl_decr(0);
                   1385:
                   1386:        /* Drop half. */
                   1387:        median_ticks = ip_reass_ttl_decr(median_ticks);
                   1388:
                   1389: }
                   1390:
                   1391: /*
1.1       cgd      1392:  * IP timer processing;
                   1393:  * if a timer expires on a reassembly
                   1394:  * queue, discard it.
                   1395:  */
1.8       mycroft  1396: void
1.211     perry    1397: ip_slowtimo(void)
1.1       cgd      1398: {
1.191     jonathan 1399:        static u_int dropscanidx = 0;
                   1400:        u_int i;
1.194     jonathan 1401:        u_int median_ttl;
1.268     ad       1402:
                   1403:        mutex_enter(softnet_lock);
                   1404:        KERNEL_LOCK(1, NULL);
1.1       cgd      1405:
1.75      thorpej  1406:        IPQ_LOCK();
1.194     jonathan 1407:
                   1408:        /* Age TTL of all fragments by 1 tick .*/
                   1409:        median_ttl = ip_reass_ttl_decr(1);
                   1410:
                   1411:        /* make sure fragment limit is up-to-date */
                   1412:        CHECK_NMBCLUSTER_PARAMS();
                   1413:
                   1414:        /* If we have too many fragments, drop the older half. */
                   1415:        if (ip_nfrags > ip_maxfrags)
                   1416:                ip_reass_ttl_decr(median_ttl);
                   1417:
1.131     itojun   1418:        /*
1.194     jonathan 1419:         * If we are over the maximum number of fragmented packets
1.131     itojun   1420:         * (due to the limit being lowered), drain off
1.190     jonathan 1421:         * enough to get down to the new limit. Start draining
                   1422:         * from the reassembly hashqueue most recently drained.
1.131     itojun   1423:         */
                   1424:        if (ip_maxfragpackets < 0)
                   1425:                ;
                   1426:        else {
1.190     jonathan 1427:                int wrapped = 0;
                   1428:
                   1429:                i = dropscanidx;
                   1430:                while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
                   1431:                        while (LIST_FIRST(&ipq[i]) != NULL)
                   1432:                                ip_freef(LIST_FIRST(&ipq[i]));
                   1433:                        if (++i >= IPREASS_NHASH) {
                   1434:                                i = 0;
                   1435:                        }
                   1436:                        /*
                   1437:                         * Dont scan forever even if fragment counters are
                   1438:                         * wrong: stop after scanning entire reassembly queue.
                   1439:                         */
                   1440:                        if (i == dropscanidx)
                   1441:                            wrapped = 1;
                   1442:                }
                   1443:                dropscanidx = i;
1.131     itojun   1444:        }
1.75      thorpej  1445:        IPQ_UNLOCK();
1.268     ad       1446:
                   1447:        KERNEL_UNLOCK_ONE(NULL);
                   1448:        mutex_exit(softnet_lock);
1.1       cgd      1449: }
                   1450:
                   1451: /*
1.270     ad       1452:  * Drain off all datagram fragments.  Don't acquire softnet_lock as
                   1453:  * can be called from hardware interrupt context.
1.1       cgd      1454:  */
1.8       mycroft  1455: void
1.211     perry    1456: ip_drain(void)
1.1       cgd      1457: {
                   1458:
1.268     ad       1459:        KERNEL_LOCK(1, NULL);
                   1460:
1.75      thorpej  1461:        /*
                   1462:         * We may be called from a device's interrupt context.  If
                   1463:         * the ipq is already busy, just bail out now.
                   1464:         */
1.268     ad       1465:        if (ipq_lock_try() != 0) {
                   1466:                /*
                   1467:                 * Drop half the total fragments now. If more mbufs are
                   1468:                 * needed, we will be called again soon.
                   1469:                 */
                   1470:                ip_reass_drophalf();
                   1471:                IPQ_UNLOCK();
                   1472:        }
1.75      thorpej  1473:
1.268     ad       1474:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd      1475: }
                   1476:
                   1477: /*
                   1478:  * Do option processing on a datagram,
                   1479:  * possibly discarding it if bad options are encountered,
                   1480:  * or forwarding it if source-routed.
                   1481:  * Returns 1 if packet has been forwarded/freed,
                   1482:  * 0 if the packet should be processed further.
                   1483:  */
1.8       mycroft  1484: int
1.211     perry    1485: ip_dooptions(struct mbuf *m)
1.1       cgd      1486: {
1.109     augustss 1487:        struct ip *ip = mtod(m, struct ip *);
                   1488:        u_char *cp, *cp0;
                   1489:        struct ip_timestamp *ipt;
                   1490:        struct in_ifaddr *ia;
1.1       cgd      1491:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1492:        struct in_addr dst;
1.1       cgd      1493:        n_time ntime;
                   1494:
1.13      mycroft  1495:        dst = ip->ip_dst;
1.1       cgd      1496:        cp = (u_char *)(ip + 1);
                   1497:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1498:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1499:                opt = cp[IPOPT_OPTVAL];
                   1500:                if (opt == IPOPT_EOL)
                   1501:                        break;
                   1502:                if (opt == IPOPT_NOP)
                   1503:                        optlen = 1;
                   1504:                else {
1.113     itojun   1505:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1506:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1507:                                goto bad;
                   1508:                        }
1.1       cgd      1509:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1510:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1511:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1512:                                goto bad;
                   1513:                        }
                   1514:                }
                   1515:                switch (opt) {
                   1516:
                   1517:                default:
                   1518:                        break;
                   1519:
                   1520:                /*
                   1521:                 * Source routing with record.
                   1522:                 * Find interface with current destination address.
                   1523:                 * If none on this machine then drop if strictly routed,
                   1524:                 * or do nothing if loosely routed.
                   1525:                 * Record interface address and bring up next address
                   1526:                 * component.  If strictly routed make sure next
                   1527:                 * address is on directly accessible net.
                   1528:                 */
                   1529:                case IPOPT_LSRR:
                   1530:                case IPOPT_SSRR:
1.47      cjs      1531:                        if (ip_allowsrcrt == 0) {
                   1532:                                type = ICMP_UNREACH;
                   1533:                                code = ICMP_UNREACH_NET_PROHIB;
                   1534:                                goto bad;
                   1535:                        }
1.114     itojun   1536:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1537:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1538:                                goto bad;
                   1539:                        }
1.1       cgd      1540:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1541:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1542:                                goto bad;
                   1543:                        }
                   1544:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1545:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1546:                        if (ia == 0) {
                   1547:                                if (opt == IPOPT_SSRR) {
                   1548:                                        type = ICMP_UNREACH;
                   1549:                                        code = ICMP_UNREACH_SRCFAIL;
                   1550:                                        goto bad;
                   1551:                                }
                   1552:                                /*
                   1553:                                 * Loose routing, and not at next destination
                   1554:                                 * yet; nothing to do except forward.
                   1555:                                 */
                   1556:                                break;
                   1557:                        }
                   1558:                        off--;                  /* 0 origin */
1.112     sommerfe 1559:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1560:                                /*
                   1561:                                 * End of source route.  Should be for us.
                   1562:                                 */
                   1563:                                save_rte(cp, ip->ip_src);
                   1564:                                break;
                   1565:                        }
                   1566:                        /*
                   1567:                         * locate outgoing interface
                   1568:                         */
1.281     tsutsui  1569:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd      1570:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1571:                        if (opt == IPOPT_SSRR)
1.196     itojun   1572:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1573:                        else
1.1       cgd      1574:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1575:                        if (ia == 0) {
                   1576:                                type = ICMP_UNREACH;
                   1577:                                code = ICMP_UNREACH_SRCFAIL;
                   1578:                                goto bad;
                   1579:                        }
                   1580:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1581:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1582:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1583:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1584:                        /*
                   1585:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1586:                         */
1.18      mycroft  1587:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1588:                        break;
                   1589:
                   1590:                case IPOPT_RR:
1.114     itojun   1591:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1592:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1593:                                goto bad;
                   1594:                        }
1.1       cgd      1595:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1596:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1597:                                goto bad;
                   1598:                        }
                   1599:                        /*
                   1600:                         * If no space remains, ignore.
                   1601:                         */
                   1602:                        off--;                  /* 0 origin */
1.112     sommerfe 1603:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1604:                                break;
1.281     tsutsui  1605:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1606:                            sizeof(ipaddr.sin_addr));
                   1607:                        /*
                   1608:                         * locate outgoing interface; if we're the destination,
                   1609:                         * use the incoming interface (should be same).
                   1610:                         */
1.96      thorpej  1611:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1612:                            == NULL &&
                   1613:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1614:                                type = ICMP_UNREACH;
                   1615:                                code = ICMP_UNREACH_HOST;
                   1616:                                goto bad;
                   1617:                        }
1.244     christos 1618:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1619:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1620:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1621:                        break;
                   1622:
                   1623:                case IPOPT_TS:
                   1624:                        code = cp - (u_char *)ip;
                   1625:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1626:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1627:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1628:                                goto bad;
1.114     itojun   1629:                        }
                   1630:                        if (ipt->ipt_ptr < 5) {
                   1631:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1632:                                goto bad;
                   1633:                        }
1.15      cgd      1634:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1635:                                if (++ipt->ipt_oflw == 0) {
                   1636:                                        code = (u_char *)&ipt->ipt_ptr -
                   1637:                                            (u_char *)ip;
1.1       cgd      1638:                                        goto bad;
1.114     itojun   1639:                                }
1.1       cgd      1640:                                break;
                   1641:                        }
1.104     thorpej  1642:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1643:                        switch (ipt->ipt_flg) {
                   1644:
                   1645:                        case IPOPT_TS_TSONLY:
                   1646:                                break;
                   1647:
                   1648:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1649:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1650:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1651:                                        code = (u_char *)&ipt->ipt_ptr -
                   1652:                                            (u_char *)ip;
1.1       cgd      1653:                                        goto bad;
1.114     itojun   1654:                                }
1.13      mycroft  1655:                                ipaddr.sin_addr = dst;
1.96      thorpej  1656:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1657:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1658:                                if (ia == 0)
                   1659:                                        continue;
1.104     thorpej  1660:                                bcopy(&ia->ia_addr.sin_addr,
                   1661:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1662:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1663:                                break;
                   1664:
                   1665:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1666:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1667:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1668:                                        code = (u_char *)&ipt->ipt_ptr -
                   1669:                                            (u_char *)ip;
1.1       cgd      1670:                                        goto bad;
1.114     itojun   1671:                                }
1.281     tsutsui  1672:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1673:                                    sizeof(struct in_addr));
1.96      thorpej  1674:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1675:                                    == NULL)
1.1       cgd      1676:                                        continue;
                   1677:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1678:                                break;
                   1679:
                   1680:                        default:
1.114     itojun   1681:                                /* XXX can't take &ipt->ipt_flg */
                   1682:                                code = (u_char *)&ipt->ipt_ptr -
                   1683:                                    (u_char *)ip + 1;
1.1       cgd      1684:                                goto bad;
                   1685:                        }
                   1686:                        ntime = iptime();
1.107     thorpej  1687:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1688:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1689:                            sizeof(n_time));
                   1690:                        ipt->ipt_ptr += sizeof(n_time);
                   1691:                }
                   1692:        }
                   1693:        if (forward) {
1.26      thorpej  1694:                if (ip_forwsrcrt == 0) {
                   1695:                        type = ICMP_UNREACH;
                   1696:                        code = ICMP_UNREACH_SRCFAIL;
                   1697:                        goto bad;
                   1698:                }
1.1       cgd      1699:                ip_forward(m, 1);
                   1700:                return (1);
1.13      mycroft  1701:        }
                   1702:        return (0);
1.1       cgd      1703: bad:
1.13      mycroft  1704:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1705:        IP_STATINC(IP_STAT_BADOPTIONS);
1.1       cgd      1706:        return (1);
                   1707: }
                   1708:
                   1709: /*
                   1710:  * Given address of next destination (final or next hop),
                   1711:  * return internet address info of interface to be used to get there.
                   1712:  */
                   1713: struct in_ifaddr *
1.211     perry    1714: ip_rtaddr(struct in_addr dst)
1.1       cgd      1715: {
1.249     dyoung   1716:        struct rtentry *rt;
                   1717:        union {
                   1718:                struct sockaddr         dst;
                   1719:                struct sockaddr_in      dst4;
                   1720:        } u;
                   1721:
                   1722:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1723:
                   1724:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
                   1725:                return NULL;
                   1726:
                   1727:        return ifatoia(rt->rt_ifa);
1.1       cgd      1728: }
                   1729:
                   1730: /*
                   1731:  * Save incoming source route for use in replies,
                   1732:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1733:  */
1.13      mycroft  1734: void
1.211     perry    1735: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1736: {
                   1737:        unsigned olen;
                   1738:
                   1739:        olen = option[IPOPT_OLEN];
                   1740: #ifdef DIAGNOSTIC
                   1741:        if (ipprintfs)
1.39      christos 1742:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1743: #endif /* 0 */
1.1       cgd      1744:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1745:                return;
1.281     tsutsui  1746:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1747:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1748:        ip_srcrt.dst = dst;
                   1749: }
                   1750:
                   1751: /*
                   1752:  * Retrieve incoming source route for use in replies,
                   1753:  * in the same form used by setsockopt.
                   1754:  * The first hop is placed before the options, will be removed later.
                   1755:  */
                   1756: struct mbuf *
1.211     perry    1757: ip_srcroute(void)
1.1       cgd      1758: {
1.109     augustss 1759:        struct in_addr *p, *q;
                   1760:        struct mbuf *m;
1.1       cgd      1761:
                   1762:        if (ip_nhops == 0)
1.237     dyoung   1763:                return NULL;
1.1       cgd      1764:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1765:        if (m == 0)
1.237     dyoung   1766:                return NULL;
1.1       cgd      1767:
1.164     matt     1768:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1769: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1770:
                   1771:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1772:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1773:            OPTSIZ;
                   1774: #ifdef DIAGNOSTIC
                   1775:        if (ipprintfs)
1.39      christos 1776:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1777: #endif
                   1778:
                   1779:        /*
                   1780:         * First save first hop for return route
                   1781:         */
                   1782:        p = &ip_srcrt.route[ip_nhops - 1];
                   1783:        *(mtod(m, struct in_addr *)) = *p--;
                   1784: #ifdef DIAGNOSTIC
                   1785:        if (ipprintfs)
1.39      christos 1786:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1787: #endif
                   1788:
                   1789:        /*
                   1790:         * Copy option fields and padding (nop) to mbuf.
                   1791:         */
                   1792:        ip_srcrt.nop = IPOPT_NOP;
                   1793:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1794:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1795:            OPTSIZ);
                   1796:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1797:            sizeof(struct in_addr) + OPTSIZ);
                   1798: #undef OPTSIZ
                   1799:        /*
                   1800:         * Record return path as an IP source route,
                   1801:         * reversing the path (pointers are now aligned).
                   1802:         */
                   1803:        while (p >= ip_srcrt.route) {
                   1804: #ifdef DIAGNOSTIC
                   1805:                if (ipprintfs)
1.39      christos 1806:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1807: #endif
                   1808:                *q++ = *p--;
                   1809:        }
                   1810:        /*
                   1811:         * Last hop goes to final destination.
                   1812:         */
                   1813:        *q = ip_srcrt.dst;
                   1814: #ifdef DIAGNOSTIC
                   1815:        if (ipprintfs)
1.39      christos 1816:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1817: #endif
                   1818:        return (m);
                   1819: }
                   1820:
1.139     matt     1821: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1822:        [PRC_MSGSIZE] = EMSGSIZE,
                   1823:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1824:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1825:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1826:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1827:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1828:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1829:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1830:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1831: };
                   1832:
                   1833: /*
                   1834:  * Forward a packet.  If some error occurs return the sender
                   1835:  * an icmp packet.  Note we can't always generate a meaningful
                   1836:  * icmp message because icmp doesn't have a large enough repertoire
                   1837:  * of codes and types.
                   1838:  *
                   1839:  * If not forwarding, just drop the packet.  This could be confusing
                   1840:  * if ipforwarding was zero but some routing protocol was advancing
                   1841:  * us as a gateway to somewhere.  However, we must let the routing
                   1842:  * protocol deal with that.
                   1843:  *
                   1844:  * The srcrt parameter indicates whether the packet is being forwarded
                   1845:  * via a source route.
                   1846:  */
1.13      mycroft  1847: void
1.211     perry    1848: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1849: {
1.109     augustss 1850:        struct ip *ip = mtod(m, struct ip *);
                   1851:        struct rtentry *rt;
1.220     christos 1852:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1853:        struct mbuf *mcopy;
1.13      mycroft  1854:        n_long dest;
1.249     dyoung   1855:        union {
                   1856:                struct sockaddr         dst;
                   1857:                struct sockaddr_in      dst4;
                   1858:        } u;
1.164     matt     1859:
                   1860:        /*
                   1861:         * We are now in the output path.
                   1862:         */
                   1863:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1864:
                   1865:        /*
                   1866:         * Clear any in-bound checksum flags for this packet.
                   1867:         */
                   1868:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1869:
1.13      mycroft  1870:        dest = 0;
1.1       cgd      1871: #ifdef DIAGNOSTIC
1.224     joerg    1872:        if (ipprintfs) {
                   1873:                printf("forward: src %s ", inet_ntoa(ip->ip_src));
                   1874:                printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
                   1875:        }
1.1       cgd      1876: #endif
1.93      sommerfe 1877:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1878:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1879:                m_freem(m);
                   1880:                return;
                   1881:        }
                   1882:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1883:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1884:                return;
                   1885:        }
                   1886:
1.249     dyoung   1887:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
                   1888:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1889:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1890:                return;
1.1       cgd      1891:        }
                   1892:
                   1893:        /*
1.34      mycroft  1894:         * Save at most 68 bytes of the packet in case
1.1       cgd      1895:         * we need to generate an ICMP message to the src.
1.119     itojun   1896:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1897:         */
1.155     itojun   1898:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1899:        if (mcopy)
                   1900:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1901:
1.221     christos 1902:        ip->ip_ttl -= IPTTLDEC;
                   1903:
1.1       cgd      1904:        /*
                   1905:         * If forwarding packet using same interface that it came in on,
                   1906:         * perhaps should send a redirect to sender to shortcut a hop.
                   1907:         * Only send redirect if source is sending directly to us,
                   1908:         * and if packet was not source routed (or has any options).
                   1909:         * Also, don't send redirect if forwarding using a default route
                   1910:         * or a route modified by a redirect.
                   1911:         */
                   1912:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1913:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1914:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1915:            ipsendredirects && !srcrt) {
1.19      mycroft  1916:                if (rt->rt_ifa &&
                   1917:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1918:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1919:                        if (rt->rt_flags & RTF_GATEWAY)
                   1920:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1921:                        else
                   1922:                                dest = ip->ip_dst.s_addr;
                   1923:                        /*
                   1924:                         * Router requirements says to only send host
                   1925:                         * redirects.
                   1926:                         */
                   1927:                        type = ICMP_REDIRECT;
                   1928:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1929: #ifdef DIAGNOSTIC
1.77      thorpej  1930:                        if (ipprintfs)
                   1931:                                printf("redirect (%d) to %x\n", code,
                   1932:                                    (u_int32_t)dest);
1.1       cgd      1933: #endif
                   1934:                }
                   1935:        }
                   1936:
1.238     dyoung   1937:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1938:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1939:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1940:
1.1       cgd      1941:        if (error)
1.266     thorpej  1942:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1943:        else {
1.266     thorpej  1944:                uint64_t *ips = IP_STAT_GETREF();
                   1945:                ips[IP_STAT_FORWARD]++;
                   1946:                if (type) {
                   1947:                        ips[IP_STAT_REDIRECTSENT]++;
                   1948:                        IP_STAT_PUTREF();
                   1949:                } else {
                   1950:                        IP_STAT_PUTREF();
1.63      matt     1951:                        if (mcopy) {
                   1952: #ifdef GATEWAY
1.64      thorpej  1953:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1954:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1955: #endif
1.1       cgd      1956:                                m_freem(mcopy);
1.63      matt     1957:                        }
1.1       cgd      1958:                        return;
                   1959:                }
                   1960:        }
                   1961:        if (mcopy == NULL)
                   1962:                return;
1.13      mycroft  1963:
1.1       cgd      1964:        switch (error) {
                   1965:
                   1966:        case 0:                         /* forwarded, but need redirect */
                   1967:                /* type, code set above */
                   1968:                break;
                   1969:
                   1970:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1971:        case EHOSTUNREACH:
                   1972:        case ENETDOWN:
                   1973:        case EHOSTDOWN:
                   1974:        default:
                   1975:                type = ICMP_UNREACH;
                   1976:                code = ICMP_UNREACH_HOST;
                   1977:                break;
                   1978:
                   1979:        case EMSGSIZE:
                   1980:                type = ICMP_UNREACH;
                   1981:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1982:
1.274     seanb    1983:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
                   1984:                        destmtu = rt->rt_ifp->if_mtu;
1.263     cube     1985:
                   1986: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274     seanb    1987:                {
1.263     cube     1988:                        /*
                   1989:                         * If the packet is routed over IPsec tunnel, tell the
                   1990:                         * originator the tunnel MTU.
                   1991:                         *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1992:                         * XXX quickhack!!!
                   1993:                         */
                   1994:
1.89      itojun   1995:                        struct secpolicy *sp;
                   1996:                        int ipsecerror;
1.95      itojun   1997:                        size_t ipsechdr;
1.89      itojun   1998:                        struct route *ro;
                   1999:
                   2000:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   2001:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   2002:                            &ipsecerror);
1.89      itojun   2003:
1.263     cube     2004:                        if (sp != NULL) {
1.89      itojun   2005:                                /* count IPsec header size */
1.95      itojun   2006:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   2007:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   2008:
                   2009:                                /*
                   2010:                                 * find the correct route for outer IPv4
                   2011:                                 * header, compute tunnel MTU.
                   2012:                                 */
1.220     christos 2013:
1.89      itojun   2014:                                if (sp->req != NULL
1.95      itojun   2015:                                 && sp->req->sav != NULL
                   2016:                                 && sp->req->sav->sah != NULL) {
                   2017:                                        ro = &sp->req->sav->sah->sa_route;
1.274     seanb    2018:                                        rt = rtcache_validate(ro);
1.257     dyoung   2019:                                        if (rt && rt->rt_ifp) {
1.220     christos 2020:                                                destmtu =
1.257     dyoung   2021:                                                    rt->rt_rmx.rmx_mtu ?
                   2022:                                                    rt->rt_rmx.rmx_mtu :
                   2023:                                                    rt->rt_ifp->if_mtu;
1.220     christos 2024:                                                destmtu -= ipsechdr;
1.89      itojun   2025:                                        }
                   2026:                                }
                   2027:
1.173     jonathan 2028: #ifdef IPSEC
1.89      itojun   2029:                                key_freesp(sp);
1.173     jonathan 2030: #else
                   2031:                                KEY_FREESP(&sp);
                   2032: #endif
1.89      itojun   2033:                        }
1.274     seanb    2034:                }
1.263     cube     2035: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266     thorpej  2036:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      2037:                break;
                   2038:
                   2039:        case ENOBUFS:
1.143     itojun   2040: #if 1
                   2041:                /*
                   2042:                 * a router should not generate ICMP_SOURCEQUENCH as
                   2043:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   2044:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      2045:                 * or if the underlying interface is rate-limited.
1.143     itojun   2046:                 */
                   2047:                if (mcopy)
                   2048:                        m_freem(mcopy);
                   2049:                return;
                   2050: #else
1.1       cgd      2051:                type = ICMP_SOURCEQUENCH;
                   2052:                code = 0;
                   2053:                break;
1.143     itojun   2054: #endif
1.1       cgd      2055:        }
1.220     christos 2056:        icmp_error(mcopy, type, code, dest, destmtu);
1.44      thorpej  2057: }
                   2058:
                   2059: void
1.211     perry    2060: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   2061:     struct mbuf *m)
1.44      thorpej  2062: {
                   2063:
1.283     minskim  2064:        if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278     christos 2065: #ifdef SO_OTIMESTAMP
1.283     minskim  2066:            || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278     christos 2067: #endif
                   2068:            ) {
1.44      thorpej  2069:                struct timeval tv;
                   2070:
                   2071:                microtime(&tv);
1.278     christos 2072: #ifdef SO_OTIMESTAMP
                   2073:                if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
                   2074:                        struct timeval50 tv50;
                   2075:                        timeval_to_timeval50(&tv, &tv50);
                   2076:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   2077:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   2078:                } else
                   2079: #endif
1.244     christos 2080:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  2081:                    SCM_TIMESTAMP, SOL_SOCKET);
                   2082:                if (*mp)
                   2083:                        mp = &(*mp)->m_next;
                   2084:        }
                   2085:        if (inp->inp_flags & INP_RECVDSTADDR) {
1.244     christos 2086:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  2087:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   2088:                if (*mp)
                   2089:                        mp = &(*mp)->m_next;
                   2090:        }
                   2091: #ifdef notyet
                   2092:        /*
                   2093:         * XXX
                   2094:         * Moving these out of udp_input() made them even more broken
                   2095:         * than they already were.
                   2096:         *      - fenner@parc.xerox.com
                   2097:         */
                   2098:        /* options were tossed already */
                   2099:        if (inp->inp_flags & INP_RECVOPTS) {
1.244     christos 2100:                *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44      thorpej  2101:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   2102:                if (*mp)
                   2103:                        mp = &(*mp)->m_next;
                   2104:        }
                   2105:        /* ip_srcroute doesn't do what we want here, need to fix */
                   2106:        if (inp->inp_flags & INP_RECVRETOPTS) {
1.244     christos 2107:                *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44      thorpej  2108:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   2109:                if (*mp)
                   2110:                        mp = &(*mp)->m_next;
                   2111:        }
                   2112: #endif
                   2113:        if (inp->inp_flags & INP_RECVIF) {
                   2114:                struct sockaddr_dl sdl;
                   2115:
1.252     dyoung   2116:                sockaddr_dl_init(&sdl, sizeof(sdl),
                   2117:                    (m->m_pkthdr.rcvif != NULL)
                   2118:                        ?  m->m_pkthdr.rcvif->if_index
                   2119:                        : 0,
                   2120:                        0, NULL, 0, NULL, 0);
1.251     dyoung   2121:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  2122:                if (*mp)
                   2123:                        mp = &(*mp)->m_next;
                   2124:        }
1.282     minskim  2125:        if (inp->inp_flags & INP_RECVTTL) {
                   2126:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   2127:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   2128:                if (*mp)
                   2129:                        mp = &(*mp)->m_next;
                   2130:        }
1.13      mycroft  2131: }
                   2132:
1.189     atatat   2133: /*
1.228     elad     2134:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   2135:  */
                   2136: static int
                   2137: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   2138: {
                   2139:        int error, tmp;
                   2140:        struct sysctlnode node;
                   2141:
                   2142:        node = *rnode;
                   2143:        tmp = ip_forwsrcrt;
                   2144:        node.sysctl_data = &tmp;
                   2145:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2146:        if (error || newp == NULL)
                   2147:                return (error);
                   2148:
1.280     elad     2149:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   2150:            0, NULL, NULL, NULL);
                   2151:        if (error)
                   2152:                return (error);
1.228     elad     2153:
                   2154:        ip_forwsrcrt = tmp;
                   2155:
                   2156:        return (0);
                   2157: }
                   2158:
                   2159: /*
1.189     atatat   2160:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   2161:  * range of the new value and tweaks timers if it changes.
                   2162:  */
                   2163: static int
                   2164: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  2165: {
1.189     atatat   2166:        int error, tmp;
                   2167:        struct sysctlnode node;
                   2168:
                   2169:        node = *rnode;
                   2170:        tmp = ip_mtudisc_timeout;
                   2171:        node.sysctl_data = &tmp;
                   2172:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2173:        if (error || newp == NULL)
                   2174:                return (error);
                   2175:        if (tmp < 0)
                   2176:                return (EINVAL);
1.52      thorpej  2177:
1.273     matt     2178:        mutex_enter(softnet_lock);
                   2179:
1.189     atatat   2180:        ip_mtudisc_timeout = tmp;
                   2181:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   2182:
1.273     matt     2183:        mutex_exit(softnet_lock);
                   2184:
1.189     atatat   2185:        return (0);
                   2186: }
1.54      lukem    2187:
1.65      matt     2188: #ifdef GATEWAY
1.189     atatat   2189: /*
1.247     liamjfoy 2190:  * sysctl helper routine for net.inet.ip.maxflows.
1.189     atatat   2191:  */
                   2192: static int
                   2193: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   2194: {
1.273     matt     2195:        int error;
1.67      thorpej  2196:
1.273     matt     2197:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   2198:        if (error || newp == NULL)
                   2199:                return (error);
                   2200:
                   2201:        mutex_enter(softnet_lock);
                   2202:        KERNEL_LOCK(1, NULL);
1.212     perry    2203:
1.265     thorpej  2204:        ipflow_prune();
1.273     matt     2205:
                   2206:        KERNEL_UNLOCK_ONE(NULL);
                   2207:        mutex_exit(softnet_lock);
1.144     martin   2208:
1.189     atatat   2209:        return (0);
                   2210: }
1.248     liamjfoy 2211:
                   2212: static int
                   2213: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283     minskim  2214: {
1.248     liamjfoy 2215:        int error, tmp;
                   2216:        struct sysctlnode node;
                   2217:
                   2218:        node = *rnode;
                   2219:        tmp = ip_hashsize;
                   2220:        node.sysctl_data = &tmp;
                   2221:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2222:        if (error || newp == NULL)
                   2223:                return (error);
                   2224:
                   2225:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   2226:                /*
                   2227:                 * Can only fail due to malloc()
                   2228:                 */
1.273     matt     2229:                mutex_enter(softnet_lock);
                   2230:                KERNEL_LOCK(1, NULL);
                   2231:
                   2232:                error = ipflow_invalidate_all(tmp);
                   2233:
                   2234:                KERNEL_UNLOCK_ONE(NULL);
                   2235:                mutex_exit(softnet_lock);
                   2236:
1.248     liamjfoy 2237:        } else {
                   2238:                /*
                   2239:                 * EINVAL if not a power of 2
                   2240:                 */
1.273     matt     2241:                error = EINVAL;
1.283     minskim  2242:        }
1.248     liamjfoy 2243:
1.273     matt     2244:        return error;
1.248     liamjfoy 2245: }
1.189     atatat   2246: #endif /* GATEWAY */
1.117     tron     2247:
1.266     thorpej  2248: static int
                   2249: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   2250: {
                   2251:
1.271     thorpej  2252:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  2253: }
1.131     itojun   2254:
1.284   ! pooka    2255: static void
        !          2256: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   2257: {
                   2258:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 2259:
1.197     atatat   2260:        sysctl_createv(clog, 0, NULL, NULL,
                   2261:                       CTLFLAG_PERMANENT,
1.189     atatat   2262:                       CTLTYPE_NODE, "net", NULL,
                   2263:                       NULL, 0, NULL, 0,
                   2264:                       CTL_NET, CTL_EOL);
1.197     atatat   2265:        sysctl_createv(clog, 0, NULL, NULL,
                   2266:                       CTLFLAG_PERMANENT,
1.203     atatat   2267:                       CTLTYPE_NODE, "inet",
                   2268:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   2269:                       NULL, 0, NULL, 0,
                   2270:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   2271:        sysctl_createv(clog, 0, NULL, NULL,
                   2272:                       CTLFLAG_PERMANENT,
1.203     atatat   2273:                       CTLTYPE_NODE, "ip",
                   2274:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   2275:                       NULL, 0, NULL, 0,
                   2276:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    2277:
1.197     atatat   2278:        sysctl_createv(clog, 0, NULL, NULL,
                   2279:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2280:                       CTLTYPE_INT, "forwarding",
                   2281:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   2282:                       NULL, 0, &ipforwarding, 0,
                   2283:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2284:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   2285:        sysctl_createv(clog, 0, NULL, NULL,
                   2286:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2287:                       CTLTYPE_INT, "redirect",
                   2288:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   2289:                       NULL, 0, &ipsendredirects, 0,
                   2290:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2291:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   2292:        sysctl_createv(clog, 0, NULL, NULL,
                   2293:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2294:                       CTLTYPE_INT, "ttl",
                   2295:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   2296:                       NULL, 0, &ip_defttl, 0,
                   2297:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2298:                       IPCTL_DEFTTL, CTL_EOL);
                   2299: #ifdef IPCTL_DEFMTU
1.197     atatat   2300:        sysctl_createv(clog, 0, NULL, NULL,
                   2301:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   2302:                       CTLTYPE_INT, "mtu",
                   2303:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   2304:                       NULL, 0, &ip_mtu, 0,
                   2305:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2306:                       IPCTL_DEFMTU, CTL_EOL);
                   2307: #endif /* IPCTL_DEFMTU */
1.197     atatat   2308:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     2309:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2310:                       CTLTYPE_INT, "forwsrcrt",
                   2311:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   2312:                                    "datagrams"),
1.228     elad     2313:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   2314:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2315:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   2316:        sysctl_createv(clog, 0, NULL, NULL,
                   2317:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2318:                       CTLTYPE_INT, "directed-broadcast",
                   2319:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   2320:                       NULL, 0, &ip_directedbcast, 0,
                   2321:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2322:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   2323:        sysctl_createv(clog, 0, NULL, NULL,
                   2324:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2325:                       CTLTYPE_INT, "allowsrcrt",
                   2326:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   2327:                       NULL, 0, &ip_allowsrcrt, 0,
                   2328:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2329:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   2330:        sysctl_createv(clog, 0, NULL, NULL,
                   2331:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2332:                       CTLTYPE_INT, "subnetsarelocal",
                   2333:                       SYSCTL_DESCR("Whether logical subnets are considered "
                   2334:                                    "local"),
1.189     atatat   2335:                       NULL, 0, &subnetsarelocal, 0,
                   2336:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2337:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   2338:        sysctl_createv(clog, 0, NULL, NULL,
                   2339:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2340:                       CTLTYPE_INT, "mtudisc",
                   2341:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   2342:                       NULL, 0, &ip_mtudisc, 0,
                   2343:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2344:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   2345:        sysctl_createv(clog, 0, NULL, NULL,
                   2346:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2347:                       CTLTYPE_INT, "anonportmin",
                   2348:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   2349:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   2350:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2351:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   2352:        sysctl_createv(clog, 0, NULL, NULL,
                   2353:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2354:                       CTLTYPE_INT, "anonportmax",
                   2355:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   2356:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   2357:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2358:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   2359:        sysctl_createv(clog, 0, NULL, NULL,
                   2360:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2361:                       CTLTYPE_INT, "mtudisctimeout",
                   2362:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   2363:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   2364:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2365:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   2366: #ifdef GATEWAY
1.197     atatat   2367:        sysctl_createv(clog, 0, NULL, NULL,
                   2368:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2369:                       CTLTYPE_INT, "maxflows",
                   2370:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   2371:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   2372:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2373:                       IPCTL_MAXFLOWS, CTL_EOL);
1.248     liamjfoy 2374:        sysctl_createv(clog, 0, NULL, NULL,
                   2375:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2376:                        CTLTYPE_INT, "hashsize",
                   2377:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
                   2378:                        sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
                   2379:                        CTL_NET, PF_INET, IPPROTO_IP,
                   2380:                        CTL_CREATE, CTL_EOL);
1.189     atatat   2381: #endif /* GATEWAY */
1.197     atatat   2382:        sysctl_createv(clog, 0, NULL, NULL,
                   2383:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2384:                       CTLTYPE_INT, "hostzerobroadcast",
                   2385:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   2386:                       NULL, 0, &hostzeroisbroadcast, 0,
                   2387:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2388:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   2389: #if NGIF > 0
1.197     atatat   2390:        sysctl_createv(clog, 0, NULL, NULL,
                   2391:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2392:                       CTLTYPE_INT, "gifttl",
                   2393:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   2394:                       NULL, 0, &ip_gif_ttl, 0,
                   2395:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2396:                       IPCTL_GIF_TTL, CTL_EOL);
                   2397: #endif /* NGIF */
                   2398: #ifndef IPNOPRIVPORTS
1.197     atatat   2399:        sysctl_createv(clog, 0, NULL, NULL,
                   2400:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2401:                       CTLTYPE_INT, "lowportmin",
                   2402:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   2403:                                    "to assign"),
1.189     atatat   2404:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   2405:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2406:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   2407:        sysctl_createv(clog, 0, NULL, NULL,
                   2408:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2409:                       CTLTYPE_INT, "lowportmax",
                   2410:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   2411:                                    "to assign"),
1.189     atatat   2412:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   2413:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2414:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   2415: #endif /* IPNOPRIVPORTS */
1.197     atatat   2416:        sysctl_createv(clog, 0, NULL, NULL,
                   2417:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2418:                       CTLTYPE_INT, "maxfragpackets",
                   2419:                       SYSCTL_DESCR("Maximum number of fragments to retain for "
                   2420:                                    "possible reassembly"),
1.189     atatat   2421:                       NULL, 0, &ip_maxfragpackets, 0,
                   2422:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2423:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
                   2424: #if NGRE > 0
1.197     atatat   2425:        sysctl_createv(clog, 0, NULL, NULL,
                   2426:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2427:                       CTLTYPE_INT, "grettl",
                   2428:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   2429:                       NULL, 0, &ip_gre_ttl, 0,
                   2430:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2431:                       IPCTL_GRE_TTL, CTL_EOL);
                   2432: #endif /* NGRE */
1.197     atatat   2433:        sysctl_createv(clog, 0, NULL, NULL,
                   2434:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2435:                       CTLTYPE_INT, "checkinterface",
                   2436:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   2437:                                    "from RFC1122"),
1.189     atatat   2438:                       NULL, 0, &ip_checkinterface, 0,
                   2439:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2440:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   2441:        sysctl_createv(clog, 0, NULL, NULL,
                   2442:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2443:                       CTLTYPE_INT, "random_id",
                   2444:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   2445:                       NULL, 0, &ip_do_randomid, 0,
                   2446:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2447:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  2448:        sysctl_createv(clog, 0, NULL, NULL,
                   2449:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2450:                       CTLTYPE_INT, "do_loopback_cksum",
                   2451:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   2452:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   2453:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2454:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     2455:        sysctl_createv(clog, 0, NULL, NULL,
                   2456:                       CTLFLAG_PERMANENT,
                   2457:                       CTLTYPE_STRUCT, "stats",
                   2458:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  2459:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     2460:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   2461:                       CTL_EOL);
1.1       cgd      2462: }
1.266     thorpej  2463:
                   2464: void
                   2465: ip_statinc(u_int stat)
                   2466: {
                   2467:
                   2468:        KASSERT(stat < IP_NSTATS);
                   2469:        IP_STATINC(stat);
                   2470: }

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