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Annotation of src/sys/netinet/ip_input.c, Revision 1.267

1.267   ! thorpej     1: /*     $NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 thorpej Exp $   */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
1.172     agc        81:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        82:  *    may be used to endorse or promote products derived from this software
                     83:  *    without specific prior written permission.
                     84:  *
                     85:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     86:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     87:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     88:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     89:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     90:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     91:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     92:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     93:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     94:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     95:  * SUCH DAMAGE.
                     96:  *
1.14      cgd        97:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        98:  */
1.141     lukem      99:
                    100: #include <sys/cdefs.h>
1.267   ! thorpej   101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 thorpej Exp $");
1.55      scottr    102:
1.184     jonathan  103: #include "opt_inet.h"
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91      thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.167     martin    108: #include "opt_mbuftrace.h"
1.135     thorpej   109: #include "opt_inet_csum.h"
1.1       cgd       110:
1.5       mycroft   111: #include <sys/param.h>
                    112: #include <sys/systm.h>
                    113: #include <sys/malloc.h>
                    114: #include <sys/mbuf.h>
                    115: #include <sys/domain.h>
                    116: #include <sys/protosw.h>
                    117: #include <sys/socket.h>
1.44      thorpej   118: #include <sys/socketvar.h>
1.5       mycroft   119: #include <sys/errno.h>
                    120: #include <sys/time.h>
                    121: #include <sys/kernel.h>
1.72      thorpej   122: #include <sys/pool.h>
1.28      christos  123: #include <sys/sysctl.h>
1.230     elad      124: #include <sys/kauth.h>
1.1       cgd       125:
1.5       mycroft   126: #include <net/if.h>
1.44      thorpej   127: #include <net/if_dl.h>
1.5       mycroft   128: #include <net/route.h>
1.45      mrg       129: #include <net/pfil.h>
1.1       cgd       130:
1.5       mycroft   131: #include <netinet/in.h>
                    132: #include <netinet/in_systm.h>
                    133: #include <netinet/ip.h>
                    134: #include <netinet/in_pcb.h>
1.215     yamt      135: #include <netinet/in_proto.h>
1.5       mycroft   136: #include <netinet/in_var.h>
                    137: #include <netinet/ip_var.h>
1.266     thorpej   138: #include <netinet/ip_private.h>
1.5       mycroft   139: #include <netinet/ip_icmp.h>
1.89      itojun    140: /* just for gif_ttl */
                    141: #include <netinet/in_gif.h>
                    142: #include "gif.h"
1.144     martin    143: #include <net/if_gre.h>
                    144: #include "gre.h"
1.111     jdolecek  145:
                    146: #ifdef MROUTING
                    147: #include <netinet/ip_mroute.h>
                    148: #endif
1.89      itojun    149:
                    150: #ifdef IPSEC
                    151: #include <netinet6/ipsec.h>
1.267   ! thorpej   152: #include <netinet6/ipsec_private.h>
1.89      itojun    153: #include <netkey/key.h>
                    154: #endif
1.173     jonathan  155: #ifdef FAST_IPSEC
                    156: #include <netipsec/ipsec.h>
                    157: #include <netipsec/key.h>
                    158: #endif /* FAST_IPSEC*/
1.44      thorpej   159:
1.1       cgd       160: #ifndef        IPFORWARDING
                    161: #ifdef GATEWAY
                    162: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    163: #else /* GATEWAY */
                    164: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    165: #endif /* GATEWAY */
                    166: #endif /* IPFORWARDING */
                    167: #ifndef        IPSENDREDIRECTS
                    168: #define        IPSENDREDIRECTS 1
                    169: #endif
1.26      thorpej   170: #ifndef IPFORWSRCRT
1.47      cjs       171: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    172: #endif
                    173: #ifndef IPALLOWSRCRT
1.48      mrg       174: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   175: #endif
1.53      kml       176: #ifndef IPMTUDISC
1.153     itojun    177: #define IPMTUDISC      1
1.53      kml       178: #endif
1.60      kml       179: #ifndef IPMTUDISCTIMEOUT
1.61      kml       180: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       181: #endif
1.53      kml       182:
1.27      thorpej   183: /*
                    184:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    185:  * configuration using this option will Just Work.
                    186:  */
                    187: #ifndef IPDIRECTEDBCAST
                    188: #ifdef DIRECTED_BROADCAST
                    189: #define IPDIRECTEDBCAST        1
                    190: #else
                    191: #define        IPDIRECTEDBCAST 0
                    192: #endif /* DIRECTED_BROADCAST */
                    193: #endif /* IPDIRECTEDBCAST */
1.1       cgd       194: int    ipforwarding = IPFORWARDING;
                    195: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   196: int    ip_defttl = IPDEFTTL;
1.26      thorpej   197: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   198: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       199: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       200: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    201: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       202: #ifdef DIAGNOSTIC
                    203: int    ipprintfs = 0;
                    204: #endif
1.184     jonathan  205:
                    206: int    ip_do_randomid = 0;
                    207:
1.165     christos  208: /*
                    209:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    210:  * the Strong ES model described in RFC 1122, but since the routing table
                    211:  * and transmit implementation do not implement the Strong ES model,
                    212:  * setting this to 1 results in an odd hybrid.
                    213:  *
                    214:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    215:  * to translate the destination address to another local interface.
                    216:  *
                    217:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    218:  * to the loopback interface instead of the interface where the
                    219:  * packets for those addresses are received.
                    220:  */
                    221: int    ip_checkinterface = 0;
                    222:
1.1       cgd       223:
1.60      kml       224: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    225:
1.1       cgd       226: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      227: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    228: int    in_ifaddrentries;                       /* total number of addrs */
1.212     perry     229: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       230: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      231: u_long in_multihash;                           /* size of hash table - 1 */
                    232: int    in_multientries;                        /* total number of addrs */
                    233: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   234: struct ifqueue ipintrq;
1.183     jonathan  235: uint16_t ip_id;
1.75      thorpej   236:
1.266     thorpej   237: percpu_t *ipstat_percpu;
                    238:
1.121     thorpej   239: #ifdef PFIL_HOOKS
                    240: struct pfil_head inet_pfil_hook;
                    241: #endif
                    242:
1.194     jonathan  243: /*
                    244:  * Cached copy of nmbclusters. If nbclusters is different,
                    245:  * recalculate IP parameters derived from nmbclusters.
                    246:  */
                    247: static int     ip_nmbclusters;                 /* copy of nmbclusters */
1.210     perry     248: static void    ip_nmbclusters_changed(void);   /* recalc limits */
1.194     jonathan  249:
1.195     thorpej   250: #define CHECK_NMBCLUSTER_PARAMS()                              \
                    251: do {                                                           \
                    252:        if (__predict_false(ip_nmbclusters != nmbclusters))     \
                    253:                ip_nmbclusters_changed();                       \
                    254: } while (/*CONSTCOND*/0)
1.194     jonathan  255:
1.190     jonathan  256: /* IP datagram reassembly queues (hashed) */
                    257: #define IPREASS_NHASH_LOG2      6
                    258: #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
                    259: #define IPREASS_HMASK           (IPREASS_NHASH - 1)
                    260: #define IPREASS_HASH(x,y) \
                    261:        (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
                    262: struct ipqhead ipq[IPREASS_NHASH];
1.75      thorpej   263: int    ipq_locked;
1.212     perry     264: static int     ip_nfragpackets;        /* packets in reass queue */
1.194     jonathan  265: static int     ip_nfrags;              /* total fragments in reass queues */
                    266:
                    267: int    ip_maxfragpackets = 200;        /* limit on packets. XXX sysctl */
                    268: int    ip_maxfrags;                    /* limit on fragments. XXX sysctl */
                    269:
                    270:
                    271: /*
                    272:  * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
                    273:  * IP reassembly queue buffer managment.
1.212     perry     274:  *
1.194     jonathan  275:  * We keep a count of total IP fragments (NB: not fragmented packets!)
                    276:  * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
                    277:  * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
                    278:  * total fragments in  reassembly queues.This AIMD policy avoids
                    279:  * repeatedly deleting single packets under heavy fragmentation load
                    280:  * (e.g., from lossy NFS peers).
                    281:  */
1.212     perry     282: static u_int   ip_reass_ttl_decr(u_int ticks);
1.210     perry     283: static void    ip_reass_drophalf(void);
1.194     jonathan  284:
1.75      thorpej   285:
1.223     perry     286: static inline int ipq_lock_try(void);
                    287: static inline void ipq_unlock(void);
1.75      thorpej   288:
1.223     perry     289: static inline int
1.211     perry     290: ipq_lock_try(void)
1.75      thorpej   291: {
                    292:        int s;
                    293:
1.132     thorpej   294:        /*
1.149     wiz       295:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   296:         * mbuf allocation.
                    297:         */
                    298:        s = splvm();
1.75      thorpej   299:        if (ipq_locked) {
                    300:                splx(s);
                    301:                return (0);
                    302:        }
                    303:        ipq_locked = 1;
                    304:        splx(s);
                    305:        return (1);
                    306: }
                    307:
1.223     perry     308: static inline void
1.211     perry     309: ipq_unlock(void)
1.75      thorpej   310: {
                    311:        int s;
                    312:
1.132     thorpej   313:        s = splvm();
1.75      thorpej   314:        ipq_locked = 0;
                    315:        splx(s);
                    316: }
                    317:
                    318: #ifdef DIAGNOSTIC
                    319: #define        IPQ_LOCK()                                                      \
                    320: do {                                                                   \
                    321:        if (ipq_lock_try() == 0) {                                      \
                    322:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    323:                panic("ipq_lock");                                      \
                    324:        }                                                               \
1.159     perry     325: } while (/*CONSTCOND*/ 0)
1.75      thorpej   326: #define        IPQ_LOCK_CHECK()                                                \
                    327: do {                                                                   \
                    328:        if (ipq_locked == 0) {                                          \
                    329:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    330:                panic("ipq lock check");                                \
                    331:        }                                                               \
1.159     perry     332: } while (/*CONSTCOND*/ 0)
1.75      thorpej   333: #else
                    334: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    335: #define        IPQ_LOCK_CHECK()        /* nothing */
                    336: #endif
                    337:
                    338: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       339:
1.246     ad        340: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
                    341:     IPL_SOFTNET);
                    342: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
                    343:     IPL_VM);
1.72      thorpej   344:
1.135     thorpej   345: #ifdef INET_CSUM_COUNTERS
                    346: #include <sys/device.h>
                    347:
                    348: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    349:     NULL, "inet", "hwcsum bad");
                    350: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    351:     NULL, "inet", "hwcsum ok");
                    352: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    353:     NULL, "inet", "swcsum");
                    354:
                    355: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    356:
1.201     matt      357: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    358: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    359: EVCNT_ATTACH_STATIC(ip_swcsum);
                    360:
1.135     thorpej   361: #else
                    362:
                    363: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    364:
                    365: #endif /* INET_CSUM_COUNTERS */
                    366:
1.1       cgd       367: /*
                    368:  * We need to save the IP options in case a protocol wants to respond
                    369:  * to an incoming packet over the same route if the packet got here
                    370:  * using IP source routing.  This allows connection establishment and
                    371:  * maintenance when the remote end is on a network that is not known
                    372:  * to us.
                    373:  */
                    374: int    ip_nhops = 0;
                    375: static struct ip_srcrt {
                    376:        struct  in_addr dst;                    /* final destination */
                    377:        char    nop;                            /* one NOP to align */
                    378:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    379:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    380: } ip_srcrt;
                    381:
1.210     perry     382: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   383:
1.164     matt      384: #ifdef MBUFTRACE
1.234     dogcow    385: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    386: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      387: #endif
                    388:
1.1       cgd       389: /*
1.194     jonathan  390:  * Compute IP limits derived from the value of nmbclusters.
                    391:  */
                    392: static void
                    393: ip_nmbclusters_changed(void)
                    394: {
                    395:        ip_maxfrags = nmbclusters / 4;
                    396:        ip_nmbclusters =  nmbclusters;
                    397: }
                    398:
                    399: /*
1.1       cgd       400:  * IP initialization: fill in IP protocol switch table.
                    401:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    402:  */
1.8       mycroft   403: void
1.211     perry     404: ip_init(void)
1.1       cgd       405: {
1.199     matt      406:        const struct protosw *pr;
1.109     augustss  407:        int i;
1.1       cgd       408:
                    409:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    410:        if (pr == 0)
                    411:                panic("ip_init");
                    412:        for (i = 0; i < IPPROTO_MAX; i++)
                    413:                ip_protox[i] = pr - inetsw;
                    414:        for (pr = inetdomain.dom_protosw;
                    415:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    416:                if (pr->pr_domain->dom_family == PF_INET &&
                    417:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    418:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  419:
1.190     jonathan  420:        for (i = 0; i < IPREASS_NHASH; i++)
                    421:                LIST_INIT(&ipq[i]);
                    422:
1.262     matt      423:        ip_initid();
1.227     kardel    424:        ip_id = time_second & 0xfffff;
1.194     jonathan  425:
1.1       cgd       426:        ipintrq.ifq_maxlen = ipqmaxlen;
1.194     jonathan  427:        ip_nmbclusters_changed();
                    428:
1.181     jonathan  429:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        430:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    431:            M_WAITOK, &in_ifaddrhash);
1.166     matt      432:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    433:            M_WAITOK, &in_multihash);
1.160     itojun    434:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   435: #ifdef GATEWAY
1.248     liamjfoy  436:        ipflow_init(ip_hashsize);
1.73      thorpej   437: #endif
1.121     thorpej   438:
                    439: #ifdef PFIL_HOOKS
                    440:        /* Register our Packet Filter hook. */
1.126     thorpej   441:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    442:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   443:        i = pfil_head_register(&inet_pfil_hook);
                    444:        if (i != 0)
                    445:                printf("ip_init: WARNING: unable to register pfil hook, "
                    446:                    "error %d\n", i);
                    447: #endif /* PFIL_HOOKS */
1.135     thorpej   448:
1.164     matt      449: #ifdef MBUFTRACE
                    450:        MOWNER_ATTACH(&ip_tx_mowner);
                    451:        MOWNER_ATTACH(&ip_rx_mowner);
                    452: #endif /* MBUFTRACE */
1.266     thorpej   453:
                    454:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       455: }
                    456:
1.229     christos  457: struct sockaddr_in ipaddr = {
                    458:        .sin_len = sizeof(ipaddr),
                    459:        .sin_family = AF_INET,
                    460: };
1.1       cgd       461: struct route ipforward_rt;
                    462:
                    463: /*
1.89      itojun    464:  * IP software interrupt routine
                    465:  */
                    466: void
1.211     perry     467: ipintr(void)
1.89      itojun    468: {
                    469:        int s;
                    470:        struct mbuf *m;
                    471:
1.241     ad        472:        while (!IF_IS_EMPTY(&ipintrq)) {
1.132     thorpej   473:                s = splnet();
1.89      itojun    474:                IF_DEQUEUE(&ipintrq, m);
                    475:                splx(s);
                    476:                if (m == 0)
                    477:                        return;
                    478:                ip_input(m);
                    479:        }
                    480: }
                    481:
                    482: /*
1.1       cgd       483:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    484:  * try to reassemble.  Process options.  Pass to next level.
                    485:  */
1.8       mycroft   486: void
1.89      itojun    487: ip_input(struct mbuf *m)
1.1       cgd       488: {
1.109     augustss  489:        struct ip *ip = NULL;
                    490:        struct ipq *fp;
                    491:        struct in_ifaddr *ia;
                    492:        struct ifaddr *ifa;
1.25      cgd       493:        struct ipqent *ipqe;
1.89      itojun    494:        int hlen = 0, mff, len;
1.100     itojun    495:        int downmatch;
1.165     christos  496:        int checkif;
1.169     itojun    497:        int srcrt = 0;
1.233     tls       498:        int s;
1.190     jonathan  499:        u_int hash;
1.173     jonathan  500: #ifdef FAST_IPSEC
                    501:        struct m_tag *mtag;
                    502:        struct tdb_ident *tdbi;
                    503:        struct secpolicy *sp;
1.233     tls       504:        int error;
1.173     jonathan  505: #endif /* FAST_IPSEC */
1.1       cgd       506:
1.164     matt      507:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       508: #ifdef DIAGNOSTIC
                    509:        if ((m->m_flags & M_PKTHDR) == 0)
                    510:                panic("ipintr no HDR");
1.89      itojun    511: #endif
1.164     matt      512:
1.1       cgd       513:        /*
                    514:         * If no IP addresses have been set yet but the interfaces
                    515:         * are receiving, can't do anything with incoming packets yet.
                    516:         */
1.181     jonathan  517:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       518:                goto bad;
1.266     thorpej   519:        IP_STATINC(IP_STAT_TOTAL);
1.154     thorpej   520:        /*
                    521:         * If the IP header is not aligned, slurp it up into a new
                    522:         * mbuf with space for link headers, in the event we forward
                    523:         * it.  Otherwise, if it is aligned, make sure the entire
                    524:         * base IP header is in the first mbuf of the chain.
                    525:         */
1.244     christos  526:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   527:                if ((m = m_copyup(m, sizeof(struct ip),
                    528:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    529:                        /* XXXJRT new stat, please */
1.266     thorpej   530:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   531:                        return;
                    532:                }
                    533:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    534:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   535:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   536:                        return;
                    537:                }
1.1       cgd       538:        }
                    539:        ip = mtod(m, struct ip *);
1.13      mycroft   540:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   541:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   542:                goto bad;
                    543:        }
1.1       cgd       544:        hlen = ip->ip_hl << 2;
                    545:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   546:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       547:                goto bad;
                    548:        }
                    549:        if (hlen > m->m_len) {
                    550:                if ((m = m_pullup(m, hlen)) == 0) {
1.266     thorpej   551:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    552:                        return;
1.1       cgd       553:                }
                    554:                ip = mtod(m, struct ip *);
                    555:        }
1.98      thorpej   556:
1.85      hwr       557:        /*
1.99      thorpej   558:         * RFC1122: packets with a multicast source address are
1.98      thorpej   559:         * not allowed.
1.85      hwr       560:         */
                    561:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   562:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       563:                goto bad;
1.129     itojun    564:        }
                    565:
                    566:        /* 127/8 must not appear on wire - RFC1122 */
                    567:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    568:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    569:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   570:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    571:                        goto bad;
1.130     itojun    572:                }
1.85      hwr       573:        }
                    574:
1.135     thorpej   575:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   576:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   577:                 M_CSUM_IPv4_BAD)) {
                    578:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    579:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    580:                goto badcsum;
                    581:
                    582:        case M_CSUM_IPv4:
                    583:                /* Checksum was okay. */
                    584:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    585:                break;
                    586:
                    587:        default:
1.206     thorpej   588:                /*
                    589:                 * Must compute it ourselves.  Maybe skip checksum on
                    590:                 * loopback interfaces.
                    591:                 */
                    592:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    593:                                     IFF_LOOPBACK) || ip_do_loopback_cksum)) {
                    594:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    595:                        if (in_cksum(m, hlen) != 0)
                    596:                                goto badcsum;
                    597:                }
1.135     thorpej   598:                break;
1.1       cgd       599:        }
                    600:
1.121     thorpej   601:        /* Retrieve the packet length. */
                    602:        len = ntohs(ip->ip_len);
1.81      proff     603:
                    604:        /*
                    605:         * Check for additional length bogosity
                    606:         */
1.84      proff     607:        if (len < hlen) {
1.266     thorpej   608:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     609:                goto bad;
                    610:        }
1.1       cgd       611:
                    612:        /*
                    613:         * Check that the amount of data in the buffers
                    614:         * is as at least much as the IP header would have us expect.
                    615:         * Trim mbufs if longer than we expect.
                    616:         * Drop packet if shorter than we expect.
                    617:         */
1.35      mycroft   618:        if (m->m_pkthdr.len < len) {
1.266     thorpej   619:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       620:                goto bad;
                    621:        }
1.35      mycroft   622:        if (m->m_pkthdr.len > len) {
1.1       cgd       623:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   624:                        m->m_len = len;
                    625:                        m->m_pkthdr.len = len;
1.1       cgd       626:                } else
1.35      mycroft   627:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       628:        }
                    629:
1.193     scw       630: #if defined(IPSEC)
1.149     wiz       631:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    632:        m->m_flags &= ~M_CANFASTFWD;
                    633: #else
1.64      thorpej   634:        /*
                    635:         * Assume that we can create a fast-forward IP flow entry
                    636:         * based on this packet.
                    637:         */
                    638:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    639: #endif
1.64      thorpej   640:
1.36      mrg       641: #ifdef PFIL_HOOKS
1.33      mrg       642:        /*
1.64      thorpej   643:         * Run through list of hooks for input packets.  If there are any
                    644:         * filters which require that additional packets in the flow are
                    645:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    646:         * Note that filters must _never_ set this flag, as another filter
                    647:         * in the list may have previously cleared it.
1.33      mrg       648:         */
1.127     itojun    649:        /*
                    650:         * let ipfilter look at packet on the wire,
                    651:         * not the decapsulated packet.
                    652:         */
                    653: #ifdef IPSEC
1.136     itojun    654:        if (!ipsec_getnhist(m))
1.186     scw       655: #elif defined(FAST_IPSEC)
                    656:        if (!ipsec_indone(m))
1.127     itojun    657: #else
                    658:        if (1)
                    659: #endif
                    660:        {
1.169     itojun    661:                struct in_addr odst;
                    662:
                    663:                odst = ip->ip_dst;
1.127     itojun    664:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    665:                    PFIL_IN) != 0)
                    666:                        return;
1.127     itojun    667:                if (m == NULL)
                    668:                        return;
                    669:                ip = mtod(m, struct ip *);
1.142     darrenr   670:                hlen = ip->ip_hl << 2;
1.205     darrenr   671:                /*
                    672:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    673:                 * from generating ICMP redirects for packets that have
                    674:                 * been redirected by a hook back out on to the same LAN that
                    675:                 * they came from and is not an indication that the packet
                    676:                 * is being inffluenced by source routing options.  This
                    677:                 * allows things like
                    678:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    679:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    680:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    681:                 * also requires a "map tlp0 ..." to complete the story.
                    682:                 * One might argue whether or not this kind of network config.
1.212     perry     683:                 * should be supported in this manner...
1.205     darrenr   684:                 */
1.169     itojun    685:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    686:        }
1.36      mrg       687: #endif /* PFIL_HOOKS */
1.123     thorpej   688:
                    689: #ifdef ALTQ
                    690:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    691:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    692:                /* packet dropped by traffic conditioner */
                    693:                return;
                    694:        }
                    695: #endif
1.121     thorpej   696:
                    697:        /*
1.1       cgd       698:         * Process options and, if not destined for us,
                    699:         * ship it on.  ip_dooptions returns 1 when an
                    700:         * error was detected (causing an icmp message
                    701:         * to be sent and the original packet to be freed).
                    702:         */
                    703:        ip_nhops = 0;           /* for source routed packets */
                    704:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    705:                return;
1.1       cgd       706:
                    707:        /*
1.165     christos  708:         * Enable a consistency check between the destination address
                    709:         * and the arrival interface for a unicast packet (the RFC 1122
                    710:         * strong ES model) if IP forwarding is disabled and the packet
                    711:         * is not locally generated.
                    712:         *
                    713:         * XXX - Checking also should be disabled if the destination
                    714:         * address is ipnat'ed to a different interface.
                    715:         *
                    716:         * XXX - Checking is incompatible with IP aliases added
                    717:         * to the loopback interface instead of the interface where
                    718:         * the packets are received.
                    719:         *
                    720:         * XXX - We need to add a per ifaddr flag for this so that
                    721:         * we get finer grain control.
                    722:         */
                    723:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    724:            (m->m_pkthdr.rcvif != NULL) &&
                    725:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    726:
                    727:        /*
1.1       cgd       728:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    729:         *
                    730:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    731:         * The behavior here is to treat addresses on !IFF_UP interface
                    732:         * as not mine.
1.1       cgd       733:         */
1.100     itojun    734:        downmatch = 0;
1.140     matt      735:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    736:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  737:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    738:                                continue;
1.97      itojun    739:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    740:                                break;
1.100     itojun    741:                        else
                    742:                                downmatch++;
1.97      itojun    743:                }
                    744:        }
1.86      thorpej   745:        if (ia != NULL)
                    746:                goto ours;
1.225     christos  747:        if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209     matt      748:                IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140     matt      749:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    750:                                continue;
1.57      tls       751:                        ia = ifatoia(ifa);
1.35      mycroft   752:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    753:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   754:                            /*
                    755:                             * Look for all-0's host part (old broadcast addr),
                    756:                             * either for subnet or net.
                    757:                             */
                    758:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   759:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       760:                                goto ours;
1.57      tls       761:                        /*
                    762:                         * An interface with IP address zero accepts
                    763:                         * all packets that arrive on that interface.
                    764:                         */
                    765:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    766:                                goto ours;
1.1       cgd       767:                }
                    768:        }
1.18      mycroft   769:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   770:                struct in_multi *inm;
                    771: #ifdef MROUTING
                    772:                extern struct socket *ip_mrouter;
1.10      brezak    773:
1.4       hpeyerl   774:                if (ip_mrouter) {
                    775:                        /*
                    776:                         * If we are acting as a multicast router, all
                    777:                         * incoming multicast packets are passed to the
                    778:                         * kernel-level multicast forwarding function.
                    779:                         * The packet is returned (relatively) intact; if
                    780:                         * ip_mforward() returns a non-zero value, the packet
                    781:                         * must be discarded, else it may be accepted below.
                    782:                         *
                    783:                         * (The IP ident field is put in the same byte order
                    784:                         * as expected when ip_mforward() is called from
                    785:                         * ip_output().)
                    786:                         */
1.13      mycroft   787:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266     thorpej   788:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   789:                                m_freem(m);
1.89      itojun    790:                                return;
1.4       hpeyerl   791:                        }
                    792:
                    793:                        /*
                    794:                         * The process-level routing demon needs to receive
                    795:                         * all multicast IGMP packets, whether or not this
                    796:                         * host belongs to their destination groups.
                    797:                         */
                    798:                        if (ip->ip_p == IPPROTO_IGMP)
                    799:                                goto ours;
1.266     thorpej   800:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   801:                }
                    802: #endif
                    803:                /*
                    804:                 * See if we belong to the destination multicast group on the
                    805:                 * arrival interface.
                    806:                 */
                    807:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    808:                if (inm == NULL) {
1.266     thorpej   809:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   810:                        m_freem(m);
1.89      itojun    811:                        return;
1.4       hpeyerl   812:                }
                    813:                goto ours;
                    814:        }
1.19      mycroft   815:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   816:            in_nullhost(ip->ip_dst))
1.1       cgd       817:                goto ours;
                    818:
                    819:        /*
                    820:         * Not for us; forward if possible and desirable.
                    821:         */
                    822:        if (ipforwarding == 0) {
1.266     thorpej   823:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       824:                m_freem(m);
1.100     itojun    825:        } else {
                    826:                /*
                    827:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    828:                 * and there's no IFF_UP interface that matches ip_dst,
                    829:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    830:                 * forwarding loop till TTL goes to 0.
                    831:                 */
                    832:                if (downmatch) {
                    833:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   834:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    835:                        return;
                    836:                }
1.145     itojun    837: #ifdef IPSEC
                    838:                if (ipsec4_in_reject(m, NULL)) {
1.267   ! thorpej   839:                        IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145     itojun    840:                        goto bad;
                    841:                }
                    842: #endif
1.173     jonathan  843: #ifdef FAST_IPSEC
                    844:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    845:                s = splsoftnet();
                    846:                if (mtag != NULL) {
                    847:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    848:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    849:                } else {
                    850:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     851:                                                   IP_FORWARDING, &error);
1.173     jonathan  852:                }
                    853:                if (sp == NULL) {       /* NB: can happen if error */
                    854:                        splx(s);
                    855:                        /*XXX error stat???*/
                    856:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    857:                        goto bad;
                    858:                }
                    859:
                    860:                /*
                    861:                 * Check security policy against packet attributes.
                    862:                 */
                    863:                error = ipsec_in_reject(sp, m);
                    864:                KEY_FREESP(&sp);
                    865:                splx(s);
                    866:                if (error) {
1.266     thorpej   867:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.173     jonathan  868:                        goto bad;
1.193     scw       869:                }
                    870:
                    871:                /*
                    872:                 * Peek at the outbound SP for this packet to determine if
                    873:                 * it's a Fast Forward candidate.
                    874:                 */
                    875:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    876:                if (mtag != NULL)
                    877:                        m->m_flags &= ~M_CANFASTFWD;
                    878:                else {
                    879:                        s = splsoftnet();
                    880:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    881:                            (IP_FORWARDING |
                    882:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    883:                            &error, NULL);
                    884:                        if (sp != NULL) {
                    885:                                m->m_flags &= ~M_CANFASTFWD;
                    886:                                KEY_FREESP(&sp);
                    887:                        }
                    888:                        splx(s);
1.173     jonathan  889:                }
                    890: #endif /* FAST_IPSEC */
1.145     itojun    891:
1.169     itojun    892:                ip_forward(m, srcrt);
1.100     itojun    893:        }
1.89      itojun    894:        return;
1.1       cgd       895:
                    896: ours:
                    897:        /*
                    898:         * If offset or IP_MF are set, must reassemble.
                    899:         * Otherwise, nothing need be done.
                    900:         * (We could look in the reassembly queue to see
                    901:         * if the packet was previously fragmented,
                    902:         * but it's not worth the time; just let them time out.)
                    903:         */
1.155     itojun    904:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258     matt      905:                uint16_t off;
                    906:                /*
                    907:                 * Prevent TCP blind data attacks by not allowing non-initial
                    908:                 * fragments to start at less than 68 bytes (minimal fragment
1.259     matt      909:                 * size) and making sure the first fragment is at least 68
                    910:                 * bytes.
1.258     matt      911:                 */
1.260     matt      912:                off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259     matt      913:                if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266     thorpej   914:                        IP_STATINC(IP_STAT_BADFRAGS);
1.258     matt      915:                        goto bad;
                    916:                }
1.1       cgd       917:                /*
                    918:                 * Look for queue of fragments
                    919:                 * of this datagram.
                    920:                 */
1.75      thorpej   921:                IPQ_LOCK();
1.190     jonathan  922:                hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250     dyoung    923:                LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1       cgd       924:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   925:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    926:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260     matt      927:                            ip->ip_p == fp->ipq_p) {
                    928:                                /*
                    929:                                 * Make sure the TOS is matches previous
                    930:                                 * fragments.
                    931:                                 */
                    932:                                if (ip->ip_tos != fp->ipq_tos) {
1.266     thorpej   933:                                        IP_STATINC(IP_STAT_BADFRAGS);
1.260     matt      934:                                        goto bad;
                    935:                                }
1.1       cgd       936:                                goto found;
1.260     matt      937:                        }
1.190     jonathan  938:                }
1.1       cgd       939:                fp = 0;
                    940: found:
                    941:
                    942:                /*
                    943:                 * Adjust ip_len to not reflect header,
1.25      cgd       944:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       945:                 * convert offset of this to bytes.
                    946:                 */
1.155     itojun    947:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    948:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       949:                if (mff) {
1.16      cgd       950:                        /*
                    951:                         * Make sure that fragments have a data length
                    952:                         * that's a non-zero multiple of 8 bytes.
                    953:                         */
1.155     itojun    954:                        if (ntohs(ip->ip_len) == 0 ||
                    955:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.266     thorpej   956:                                IP_STATINC(IP_STAT_BADFRAGS);
1.75      thorpej   957:                                IPQ_UNLOCK();
1.16      cgd       958:                                goto bad;
                    959:                        }
                    960:                }
1.155     itojun    961:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       962:
                    963:                /*
                    964:                 * If datagram marked as having more fragments
                    965:                 * or if this is not the first fragment,
                    966:                 * attempt reassembly; if it succeeds, proceed.
                    967:                 */
1.155     itojun    968:                if (mff || ip->ip_off != htons(0)) {
1.266     thorpej   969:                        IP_STATINC(IP_STAT_FRAGMENTS);
1.233     tls       970:                        s = splvm();
1.72      thorpej   971:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233     tls       972:                        splx(s);
1.25      cgd       973:                        if (ipqe == NULL) {
1.266     thorpej   974:                                IP_STATINC(IP_STAT_RCVMEMDROP);
1.75      thorpej   975:                                IPQ_UNLOCK();
1.25      cgd       976:                                goto bad;
                    977:                        }
                    978:                        ipqe->ipqe_mff = mff;
1.50      thorpej   979:                        ipqe->ipqe_m = m;
1.25      cgd       980:                        ipqe->ipqe_ip = ip;
1.190     jonathan  981:                        m = ip_reass(ipqe, fp, &ipq[hash]);
1.75      thorpej   982:                        if (m == 0) {
                    983:                                IPQ_UNLOCK();
1.89      itojun    984:                                return;
1.75      thorpej   985:                        }
1.266     thorpej   986:                        IP_STATINC(IP_STAT_REASSEMBLED);
1.50      thorpej   987:                        ip = mtod(m, struct ip *);
1.74      thorpej   988:                        hlen = ip->ip_hl << 2;
1.155     itojun    989:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       990:                } else
                    991:                        if (fp)
                    992:                                ip_freef(fp);
1.75      thorpej   993:                IPQ_UNLOCK();
1.79      mycroft   994:        }
1.128     itojun    995:
1.173     jonathan  996: #if defined(IPSEC)
1.128     itojun    997:        /*
                    998:         * enforce IPsec policy checking if we are seeing last header.
                    999:         * note that we do not visit this with protocols with pcb layer
                   1000:         * code - like udp/tcp/raw ip.
                   1001:         */
                   1002:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                   1003:            ipsec4_in_reject(m, NULL)) {
1.267   ! thorpej  1004:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128     itojun   1005:                goto bad;
                   1006:        }
                   1007: #endif
1.226     liamjfoy 1008: #ifdef FAST_IPSEC
1.173     jonathan 1009:        /*
                   1010:         * enforce IPsec policy checking if we are seeing last header.
                   1011:         * note that we do not visit this with protocols with pcb layer
                   1012:         * code - like udp/tcp/raw ip.
                   1013:         */
                   1014:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                   1015:                /*
                   1016:                 * Check if the packet has already had IPsec processing
                   1017:                 * done.  If so, then just pass it along.  This tag gets
                   1018:                 * set during AH, ESP, etc. input handling, before the
                   1019:                 * packet is returned to the ip input queue for delivery.
1.212     perry    1020:                 */
1.173     jonathan 1021:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                   1022:                s = splsoftnet();
                   1023:                if (mtag != NULL) {
                   1024:                        tdbi = (struct tdb_ident *)(mtag + 1);
                   1025:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                   1026:                } else {
                   1027:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry    1028:                                                   IP_FORWARDING, &error);
1.173     jonathan 1029:                }
                   1030:                if (sp != NULL) {
                   1031:                        /*
                   1032:                         * Check security policy against packet attributes.
                   1033:                         */
                   1034:                        error = ipsec_in_reject(sp, m);
                   1035:                        KEY_FREESP(&sp);
                   1036:                } else {
                   1037:                        /* XXX error stat??? */
                   1038:                        error = EINVAL;
                   1039: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                   1040:                }
                   1041:                splx(s);
                   1042:                if (error)
                   1043:                        goto bad;
                   1044:        }
                   1045: #endif /* FAST_IPSEC */
1.1       cgd      1046:
                   1047:        /*
                   1048:         * Switch out to protocol's input routine.
                   1049:         */
1.82      aidan    1050: #if IFA_STATS
1.122     itojun   1051:        if (ia && ip)
1.155     itojun   1052:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan    1053: #endif
1.266     thorpej  1054:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun   1055:     {
                   1056:        int off = hlen, nh = ip->ip_p;
                   1057:
                   1058:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                   1059:        return;
                   1060:     }
1.1       cgd      1061: bad:
                   1062:        m_freem(m);
1.135     thorpej  1063:        return;
                   1064:
                   1065: badcsum:
1.266     thorpej  1066:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej  1067:        m_freem(m);
1.1       cgd      1068: }
                   1069:
                   1070: /*
                   1071:  * Take incoming datagram fragment and try to
                   1072:  * reassemble it into whole datagram.  If a chain for
                   1073:  * reassembly of this datagram already exists, then it
                   1074:  * is given as fp; otherwise have to make a chain.
                   1075:  */
1.50      thorpej  1076: struct mbuf *
1.211     perry    1077: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1       cgd      1078: {
1.109     augustss 1079:        struct mbuf *m = ipqe->ipqe_m;
                   1080:        struct ipqent *nq, *p, *q;
1.25      cgd      1081:        struct ip *ip;
1.1       cgd      1082:        struct mbuf *t;
1.25      cgd      1083:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233     tls      1084:        int i, next, s;
1.1       cgd      1085:
1.75      thorpej  1086:        IPQ_LOCK_CHECK();
                   1087:
1.1       cgd      1088:        /*
                   1089:         * Presence of header sizes in mbufs
                   1090:         * would confuse code below.
                   1091:         */
                   1092:        m->m_data += hlen;
                   1093:        m->m_len -= hlen;
                   1094:
1.194     jonathan 1095: #ifdef notyet
                   1096:        /* make sure fragment limit is up-to-date */
                   1097:        CHECK_NMBCLUSTER_PARAMS();
                   1098:
                   1099:        /* If we have too many fragments, drop the older half. */
                   1100:        if (ip_nfrags >= ip_maxfrags)
                   1101:                ip_reass_drophalf(void);
                   1102: #endif
                   1103:
1.1       cgd      1104:        /*
1.192     jonathan 1105:         * We are about to add a fragment; increment frag count.
                   1106:         */
                   1107:        ip_nfrags++;
1.212     perry    1108:
1.192     jonathan 1109:        /*
1.1       cgd      1110:         * If first fragment to arrive, create a reassembly queue.
                   1111:         */
                   1112:        if (fp == 0) {
1.131     itojun   1113:                /*
                   1114:                 * Enforce upper bound on number of fragmented packets
                   1115:                 * for which we attempt reassembly;
                   1116:                 * If maxfrag is 0, never accept fragments.
                   1117:                 * If maxfrag is -1, accept all fragments without limitation.
                   1118:                 */
                   1119:                if (ip_maxfragpackets < 0)
                   1120:                        ;
                   1121:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1122:                        goto dropfrag;
                   1123:                ip_nfragpackets++;
1.50      thorpej  1124:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1125:                    M_FTABLE, M_NOWAIT);
                   1126:                if (fp == NULL)
1.1       cgd      1127:                        goto dropfrag;
1.190     jonathan 1128:                LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192     jonathan 1129:                fp->ipq_nfrags = 1;
1.1       cgd      1130:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1131:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1132:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260     matt     1133:                fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148     matt     1134:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1135:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1136:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1137:                p = NULL;
1.1       cgd      1138:                goto insert;
1.192     jonathan 1139:        } else {
                   1140:                fp->ipq_nfrags++;
1.1       cgd      1141:        }
                   1142:
                   1143:        /*
                   1144:         * Find a segment which begins after this one does.
                   1145:         */
1.148     matt     1146:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1147:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1148:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1149:                        break;
                   1150:
                   1151:        /*
                   1152:         * If there is a preceding segment, it may provide some of
                   1153:         * our data already.  If so, drop the data from the incoming
                   1154:         * segment.  If it provides all of our data, drop us.
                   1155:         */
1.25      cgd      1156:        if (p != NULL) {
1.155     itojun   1157:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1158:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1159:                if (i > 0) {
1.155     itojun   1160:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1161:                                goto dropfrag;
1.50      thorpej  1162:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1163:                        ipqe->ipqe_ip->ip_off =
                   1164:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1165:                        ipqe->ipqe_ip->ip_len =
                   1166:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1167:                }
                   1168:        }
                   1169:
                   1170:        /*
                   1171:         * While we overlap succeeding segments trim them or,
                   1172:         * if they are completely covered, dequeue them.
                   1173:         */
1.155     itojun   1174:        for (; q != NULL &&
                   1175:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1176:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1177:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1178:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1179:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1180:                        q->ipqe_ip->ip_len =
                   1181:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1182:                        q->ipqe_ip->ip_off =
                   1183:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1184:                        m_adj(q->ipqe_m, i);
1.1       cgd      1185:                        break;
                   1186:                }
1.148     matt     1187:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1188:                m_freem(q->ipqe_m);
1.148     matt     1189:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1190:                s = splvm();
1.72      thorpej  1191:                pool_put(&ipqent_pool, q);
1.233     tls      1192:                splx(s);
1.192     jonathan 1193:                fp->ipq_nfrags--;
                   1194:                ip_nfrags--;
1.1       cgd      1195:        }
                   1196:
                   1197: insert:
                   1198:        /*
                   1199:         * Stick new segment in its place;
                   1200:         * check for complete reassembly.
                   1201:         */
1.25      cgd      1202:        if (p == NULL) {
1.148     matt     1203:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1204:        } else {
1.148     matt     1205:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1206:        }
1.1       cgd      1207:        next = 0;
1.148     matt     1208:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1209:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1210:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1211:                        return (0);
1.155     itojun   1212:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1213:        }
1.25      cgd      1214:        if (p->ipqe_mff)
1.1       cgd      1215:                return (0);
                   1216:
                   1217:        /*
1.41      thorpej  1218:         * Reassembly is complete.  Check for a bogus message size and
                   1219:         * concatenate fragments.
1.1       cgd      1220:         */
1.148     matt     1221:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1222:        ip = q->ipqe_ip;
1.41      thorpej  1223:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266     thorpej  1224:                IP_STATINC(IP_STAT_TOOLONG);
1.41      thorpej  1225:                ip_freef(fp);
                   1226:                return (0);
                   1227:        }
1.50      thorpej  1228:        m = q->ipqe_m;
1.1       cgd      1229:        t = m->m_next;
                   1230:        m->m_next = 0;
                   1231:        m_cat(m, t);
1.148     matt     1232:        nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1233:        s = splvm();
1.72      thorpej  1234:        pool_put(&ipqent_pool, q);
1.233     tls      1235:        splx(s);
1.25      cgd      1236:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1237:                t = q->ipqe_m;
1.148     matt     1238:                nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1239:                s = splvm();
1.72      thorpej  1240:                pool_put(&ipqent_pool, q);
1.233     tls      1241:                splx(s);
1.1       cgd      1242:                m_cat(m, t);
                   1243:        }
1.192     jonathan 1244:        ip_nfrags -= fp->ipq_nfrags;
1.1       cgd      1245:
                   1246:        /*
                   1247:         * Create header for new ip packet by
                   1248:         * modifying header of first packet;
                   1249:         * dequeue and discard fragment reassembly header.
                   1250:         * Make header visible.
                   1251:         */
1.155     itojun   1252:        ip->ip_len = htons(next);
1.25      cgd      1253:        ip->ip_src = fp->ipq_src;
                   1254:        ip->ip_dst = fp->ipq_dst;
                   1255:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1256:        FREE(fp, M_FTABLE);
1.131     itojun   1257:        ip_nfragpackets--;
1.1       cgd      1258:        m->m_len += (ip->ip_hl << 2);
                   1259:        m->m_data -= (ip->ip_hl << 2);
                   1260:        /* some debugging cruft by sklower, below, will go away soon */
                   1261:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1262:                int plen = 0;
1.50      thorpej  1263:                for (t = m; t; t = t->m_next)
                   1264:                        plen += t->m_len;
                   1265:                m->m_pkthdr.len = plen;
1.213     yamt     1266:                m->m_pkthdr.csum_flags = 0;
1.1       cgd      1267:        }
1.50      thorpej  1268:        return (m);
1.1       cgd      1269:
                   1270: dropfrag:
1.192     jonathan 1271:        if (fp != 0)
                   1272:                fp->ipq_nfrags--;
                   1273:        ip_nfrags--;
1.266     thorpej  1274:        IP_STATINC(IP_STAT_FRAGDROPPED);
1.1       cgd      1275:        m_freem(m);
1.233     tls      1276:        s = splvm();
1.72      thorpej  1277:        pool_put(&ipqent_pool, ipqe);
1.233     tls      1278:        splx(s);
1.1       cgd      1279:        return (0);
                   1280: }
                   1281:
                   1282: /*
                   1283:  * Free a fragment reassembly header and all
                   1284:  * associated datagrams.
                   1285:  */
1.8       mycroft  1286: void
1.211     perry    1287: ip_freef(struct ipq *fp)
1.1       cgd      1288: {
1.109     augustss 1289:        struct ipqent *q, *p;
1.192     jonathan 1290:        u_int nfrags = 0;
1.233     tls      1291:        int s;
1.1       cgd      1292:
1.75      thorpej  1293:        IPQ_LOCK_CHECK();
                   1294:
1.148     matt     1295:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1296:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1297:                m_freem(q->ipqe_m);
1.192     jonathan 1298:                nfrags++;
1.148     matt     1299:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1300:                s = splvm();
1.72      thorpej  1301:                pool_put(&ipqent_pool, q);
1.233     tls      1302:                splx(s);
1.1       cgd      1303:        }
1.192     jonathan 1304:
                   1305:        if (nfrags != fp->ipq_nfrags)
                   1306:            printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
                   1307:        ip_nfrags -= nfrags;
1.25      cgd      1308:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1309:        FREE(fp, M_FTABLE);
1.131     itojun   1310:        ip_nfragpackets--;
1.1       cgd      1311: }
                   1312:
                   1313: /*
1.194     jonathan 1314:  * IP reassembly TTL machinery for  multiplicative drop.
                   1315:  */
                   1316: static u_int   fragttl_histo[(IPFRAGTTL+1)];
                   1317:
                   1318:
                   1319: /*
                   1320:  * Decrement TTL of all reasembly queue entries by `ticks'.
                   1321:  * Count number of distinct fragments (as opposed to partial, fragmented
                   1322:  * datagrams) in the reassembly queue.  While we  traverse the entire
                   1323:  * reassembly queue, compute and return the median TTL over all fragments.
                   1324:  */
                   1325: static u_int
                   1326: ip_reass_ttl_decr(u_int ticks)
                   1327: {
1.198     matt     1328:        u_int nfrags, median, dropfraction, keepfraction;
1.194     jonathan 1329:        struct ipq *fp, *nfp;
1.198     matt     1330:        int i;
1.212     perry    1331:
1.194     jonathan 1332:        nfrags = 0;
                   1333:        memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212     perry    1334:
1.194     jonathan 1335:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1336:                for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
                   1337:                        fp->ipq_ttl = ((fp->ipq_ttl  <= ticks) ?
                   1338:                                       0 : fp->ipq_ttl - ticks);
                   1339:                        nfp = LIST_NEXT(fp, ipq_q);
                   1340:                        if (fp->ipq_ttl == 0) {
1.266     thorpej  1341:                                IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194     jonathan 1342:                                ip_freef(fp);
                   1343:                        } else {
                   1344:                                nfrags += fp->ipq_nfrags;
                   1345:                                fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
                   1346:                        }
                   1347:                }
                   1348:        }
                   1349:
                   1350:        KASSERT(ip_nfrags == nfrags);
                   1351:
                   1352:        /* Find median (or other drop fraction) in histogram. */
                   1353:        dropfraction = (ip_nfrags / 2);
                   1354:        keepfraction = ip_nfrags - dropfraction;
                   1355:        for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
                   1356:                median +=  fragttl_histo[i];
                   1357:                if (median >= keepfraction)
                   1358:                        break;
                   1359:        }
                   1360:
                   1361:        /* Return TTL of median (or other fraction). */
                   1362:        return (u_int)i;
                   1363: }
                   1364:
                   1365: void
                   1366: ip_reass_drophalf(void)
                   1367: {
                   1368:
                   1369:        u_int median_ticks;
                   1370:        /*
                   1371:         * Compute median TTL of all fragments, and count frags
                   1372:         * with that TTL or lower (roughly half of all fragments).
                   1373:         */
                   1374:        median_ticks = ip_reass_ttl_decr(0);
                   1375:
                   1376:        /* Drop half. */
                   1377:        median_ticks = ip_reass_ttl_decr(median_ticks);
                   1378:
                   1379: }
                   1380:
                   1381: /*
1.1       cgd      1382:  * IP timer processing;
                   1383:  * if a timer expires on a reassembly
                   1384:  * queue, discard it.
                   1385:  */
1.8       mycroft  1386: void
1.211     perry    1387: ip_slowtimo(void)
1.1       cgd      1388: {
1.191     jonathan 1389:        static u_int dropscanidx = 0;
                   1390:        u_int i;
1.194     jonathan 1391:        u_int median_ttl;
1.24      mycroft  1392:        int s = splsoftnet();
1.1       cgd      1393:
1.75      thorpej  1394:        IPQ_LOCK();
1.194     jonathan 1395:
                   1396:        /* Age TTL of all fragments by 1 tick .*/
                   1397:        median_ttl = ip_reass_ttl_decr(1);
                   1398:
                   1399:        /* make sure fragment limit is up-to-date */
                   1400:        CHECK_NMBCLUSTER_PARAMS();
                   1401:
                   1402:        /* If we have too many fragments, drop the older half. */
                   1403:        if (ip_nfrags > ip_maxfrags)
                   1404:                ip_reass_ttl_decr(median_ttl);
                   1405:
1.131     itojun   1406:        /*
1.194     jonathan 1407:         * If we are over the maximum number of fragmented packets
1.131     itojun   1408:         * (due to the limit being lowered), drain off
1.190     jonathan 1409:         * enough to get down to the new limit. Start draining
                   1410:         * from the reassembly hashqueue most recently drained.
1.131     itojun   1411:         */
                   1412:        if (ip_maxfragpackets < 0)
                   1413:                ;
                   1414:        else {
1.190     jonathan 1415:                int wrapped = 0;
                   1416:
                   1417:                i = dropscanidx;
                   1418:                while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
                   1419:                        while (LIST_FIRST(&ipq[i]) != NULL)
                   1420:                                ip_freef(LIST_FIRST(&ipq[i]));
                   1421:                        if (++i >= IPREASS_NHASH) {
                   1422:                                i = 0;
                   1423:                        }
                   1424:                        /*
                   1425:                         * Dont scan forever even if fragment counters are
                   1426:                         * wrong: stop after scanning entire reassembly queue.
                   1427:                         */
                   1428:                        if (i == dropscanidx)
                   1429:                            wrapped = 1;
                   1430:                }
                   1431:                dropscanidx = i;
1.131     itojun   1432:        }
1.75      thorpej  1433:        IPQ_UNLOCK();
1.1       cgd      1434:        splx(s);
                   1435: }
                   1436:
                   1437: /*
                   1438:  * Drain off all datagram fragments.
                   1439:  */
1.8       mycroft  1440: void
1.211     perry    1441: ip_drain(void)
1.1       cgd      1442: {
                   1443:
1.75      thorpej  1444:        /*
                   1445:         * We may be called from a device's interrupt context.  If
                   1446:         * the ipq is already busy, just bail out now.
                   1447:         */
                   1448:        if (ipq_lock_try() == 0)
                   1449:                return;
                   1450:
1.194     jonathan 1451:        /*
                   1452:         * Drop half the total fragments now. If more mbufs are needed,
                   1453:         *  we will be called again soon.
                   1454:         */
                   1455:        ip_reass_drophalf();
1.75      thorpej  1456:
                   1457:        IPQ_UNLOCK();
1.1       cgd      1458: }
                   1459:
                   1460: /*
                   1461:  * Do option processing on a datagram,
                   1462:  * possibly discarding it if bad options are encountered,
                   1463:  * or forwarding it if source-routed.
                   1464:  * Returns 1 if packet has been forwarded/freed,
                   1465:  * 0 if the packet should be processed further.
                   1466:  */
1.8       mycroft  1467: int
1.211     perry    1468: ip_dooptions(struct mbuf *m)
1.1       cgd      1469: {
1.109     augustss 1470:        struct ip *ip = mtod(m, struct ip *);
                   1471:        u_char *cp, *cp0;
                   1472:        struct ip_timestamp *ipt;
                   1473:        struct in_ifaddr *ia;
1.1       cgd      1474:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1475:        struct in_addr dst;
1.1       cgd      1476:        n_time ntime;
                   1477:
1.13      mycroft  1478:        dst = ip->ip_dst;
1.1       cgd      1479:        cp = (u_char *)(ip + 1);
                   1480:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1481:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1482:                opt = cp[IPOPT_OPTVAL];
                   1483:                if (opt == IPOPT_EOL)
                   1484:                        break;
                   1485:                if (opt == IPOPT_NOP)
                   1486:                        optlen = 1;
                   1487:                else {
1.113     itojun   1488:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1489:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1490:                                goto bad;
                   1491:                        }
1.1       cgd      1492:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1493:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1494:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1495:                                goto bad;
                   1496:                        }
                   1497:                }
                   1498:                switch (opt) {
                   1499:
                   1500:                default:
                   1501:                        break;
                   1502:
                   1503:                /*
                   1504:                 * Source routing with record.
                   1505:                 * Find interface with current destination address.
                   1506:                 * If none on this machine then drop if strictly routed,
                   1507:                 * or do nothing if loosely routed.
                   1508:                 * Record interface address and bring up next address
                   1509:                 * component.  If strictly routed make sure next
                   1510:                 * address is on directly accessible net.
                   1511:                 */
                   1512:                case IPOPT_LSRR:
                   1513:                case IPOPT_SSRR:
1.47      cjs      1514:                        if (ip_allowsrcrt == 0) {
                   1515:                                type = ICMP_UNREACH;
                   1516:                                code = ICMP_UNREACH_NET_PROHIB;
                   1517:                                goto bad;
                   1518:                        }
1.114     itojun   1519:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1520:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1521:                                goto bad;
                   1522:                        }
1.1       cgd      1523:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1524:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1525:                                goto bad;
                   1526:                        }
                   1527:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1528:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1529:                        if (ia == 0) {
                   1530:                                if (opt == IPOPT_SSRR) {
                   1531:                                        type = ICMP_UNREACH;
                   1532:                                        code = ICMP_UNREACH_SRCFAIL;
                   1533:                                        goto bad;
                   1534:                                }
                   1535:                                /*
                   1536:                                 * Loose routing, and not at next destination
                   1537:                                 * yet; nothing to do except forward.
                   1538:                                 */
                   1539:                                break;
                   1540:                        }
                   1541:                        off--;                  /* 0 origin */
1.112     sommerfe 1542:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1543:                                /*
                   1544:                                 * End of source route.  Should be for us.
                   1545:                                 */
                   1546:                                save_rte(cp, ip->ip_src);
                   1547:                                break;
                   1548:                        }
                   1549:                        /*
                   1550:                         * locate outgoing interface
                   1551:                         */
1.244     christos 1552:                        bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1       cgd      1553:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1554:                        if (opt == IPOPT_SSRR)
1.196     itojun   1555:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1556:                        else
1.1       cgd      1557:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1558:                        if (ia == 0) {
                   1559:                                type = ICMP_UNREACH;
                   1560:                                code = ICMP_UNREACH_SRCFAIL;
                   1561:                                goto bad;
                   1562:                        }
                   1563:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1564:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1565:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1566:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1567:                        /*
                   1568:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1569:                         */
1.18      mycroft  1570:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1571:                        break;
                   1572:
                   1573:                case IPOPT_RR:
1.114     itojun   1574:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1575:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1576:                                goto bad;
                   1577:                        }
1.1       cgd      1578:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1579:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1580:                                goto bad;
                   1581:                        }
                   1582:                        /*
                   1583:                         * If no space remains, ignore.
                   1584:                         */
                   1585:                        off--;                  /* 0 origin */
1.112     sommerfe 1586:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1587:                                break;
1.244     christos 1588:                        bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1       cgd      1589:                            sizeof(ipaddr.sin_addr));
                   1590:                        /*
                   1591:                         * locate outgoing interface; if we're the destination,
                   1592:                         * use the incoming interface (should be same).
                   1593:                         */
1.96      thorpej  1594:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1595:                            == NULL &&
                   1596:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1597:                                type = ICMP_UNREACH;
                   1598:                                code = ICMP_UNREACH_HOST;
                   1599:                                goto bad;
                   1600:                        }
1.244     christos 1601:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1602:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1603:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1604:                        break;
                   1605:
                   1606:                case IPOPT_TS:
                   1607:                        code = cp - (u_char *)ip;
                   1608:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1609:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1610:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1611:                                goto bad;
1.114     itojun   1612:                        }
                   1613:                        if (ipt->ipt_ptr < 5) {
                   1614:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1615:                                goto bad;
                   1616:                        }
1.15      cgd      1617:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1618:                                if (++ipt->ipt_oflw == 0) {
                   1619:                                        code = (u_char *)&ipt->ipt_ptr -
                   1620:                                            (u_char *)ip;
1.1       cgd      1621:                                        goto bad;
1.114     itojun   1622:                                }
1.1       cgd      1623:                                break;
                   1624:                        }
1.104     thorpej  1625:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1626:                        switch (ipt->ipt_flg) {
                   1627:
                   1628:                        case IPOPT_TS_TSONLY:
                   1629:                                break;
                   1630:
                   1631:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1632:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1633:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1634:                                        code = (u_char *)&ipt->ipt_ptr -
                   1635:                                            (u_char *)ip;
1.1       cgd      1636:                                        goto bad;
1.114     itojun   1637:                                }
1.13      mycroft  1638:                                ipaddr.sin_addr = dst;
1.96      thorpej  1639:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1640:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1641:                                if (ia == 0)
                   1642:                                        continue;
1.104     thorpej  1643:                                bcopy(&ia->ia_addr.sin_addr,
                   1644:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1645:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1646:                                break;
                   1647:
                   1648:                        case IPOPT_TS_PRESPEC:
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:                                }
1.104     thorpej  1655:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1656:                                    sizeof(struct in_addr));
1.96      thorpej  1657:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1658:                                    == NULL)
1.1       cgd      1659:                                        continue;
                   1660:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1661:                                break;
                   1662:
                   1663:                        default:
1.114     itojun   1664:                                /* XXX can't take &ipt->ipt_flg */
                   1665:                                code = (u_char *)&ipt->ipt_ptr -
                   1666:                                    (u_char *)ip + 1;
1.1       cgd      1667:                                goto bad;
                   1668:                        }
                   1669:                        ntime = iptime();
1.107     thorpej  1670:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1671:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1672:                            sizeof(n_time));
                   1673:                        ipt->ipt_ptr += sizeof(n_time);
                   1674:                }
                   1675:        }
                   1676:        if (forward) {
1.26      thorpej  1677:                if (ip_forwsrcrt == 0) {
                   1678:                        type = ICMP_UNREACH;
                   1679:                        code = ICMP_UNREACH_SRCFAIL;
                   1680:                        goto bad;
                   1681:                }
1.1       cgd      1682:                ip_forward(m, 1);
                   1683:                return (1);
1.13      mycroft  1684:        }
                   1685:        return (0);
1.1       cgd      1686: bad:
1.13      mycroft  1687:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1688:        IP_STATINC(IP_STAT_BADOPTIONS);
1.1       cgd      1689:        return (1);
                   1690: }
                   1691:
                   1692: /*
                   1693:  * Given address of next destination (final or next hop),
                   1694:  * return internet address info of interface to be used to get there.
                   1695:  */
                   1696: struct in_ifaddr *
1.211     perry    1697: ip_rtaddr(struct in_addr dst)
1.1       cgd      1698: {
1.249     dyoung   1699:        struct rtentry *rt;
                   1700:        union {
                   1701:                struct sockaddr         dst;
                   1702:                struct sockaddr_in      dst4;
                   1703:        } u;
                   1704:
                   1705:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1706:
                   1707:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
                   1708:                return NULL;
                   1709:
                   1710:        return ifatoia(rt->rt_ifa);
1.1       cgd      1711: }
                   1712:
                   1713: /*
                   1714:  * Save incoming source route for use in replies,
                   1715:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1716:  */
1.13      mycroft  1717: void
1.211     perry    1718: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1719: {
                   1720:        unsigned olen;
                   1721:
                   1722:        olen = option[IPOPT_OLEN];
                   1723: #ifdef DIAGNOSTIC
                   1724:        if (ipprintfs)
1.39      christos 1725:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1726: #endif /* 0 */
1.1       cgd      1727:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1728:                return;
1.244     christos 1729:        bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1       cgd      1730:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1731:        ip_srcrt.dst = dst;
                   1732: }
                   1733:
                   1734: /*
                   1735:  * Retrieve incoming source route for use in replies,
                   1736:  * in the same form used by setsockopt.
                   1737:  * The first hop is placed before the options, will be removed later.
                   1738:  */
                   1739: struct mbuf *
1.211     perry    1740: ip_srcroute(void)
1.1       cgd      1741: {
1.109     augustss 1742:        struct in_addr *p, *q;
                   1743:        struct mbuf *m;
1.1       cgd      1744:
                   1745:        if (ip_nhops == 0)
1.237     dyoung   1746:                return NULL;
1.1       cgd      1747:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1748:        if (m == 0)
1.237     dyoung   1749:                return NULL;
1.1       cgd      1750:
1.164     matt     1751:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1752: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1753:
                   1754:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1755:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1756:            OPTSIZ;
                   1757: #ifdef DIAGNOSTIC
                   1758:        if (ipprintfs)
1.39      christos 1759:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1760: #endif
                   1761:
                   1762:        /*
                   1763:         * First save first hop for return route
                   1764:         */
                   1765:        p = &ip_srcrt.route[ip_nhops - 1];
                   1766:        *(mtod(m, struct in_addr *)) = *p--;
                   1767: #ifdef DIAGNOSTIC
                   1768:        if (ipprintfs)
1.39      christos 1769:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1770: #endif
                   1771:
                   1772:        /*
                   1773:         * Copy option fields and padding (nop) to mbuf.
                   1774:         */
                   1775:        ip_srcrt.nop = IPOPT_NOP;
                   1776:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1777:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1778:            OPTSIZ);
                   1779:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1780:            sizeof(struct in_addr) + OPTSIZ);
                   1781: #undef OPTSIZ
                   1782:        /*
                   1783:         * Record return path as an IP source route,
                   1784:         * reversing the path (pointers are now aligned).
                   1785:         */
                   1786:        while (p >= ip_srcrt.route) {
                   1787: #ifdef DIAGNOSTIC
                   1788:                if (ipprintfs)
1.39      christos 1789:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1790: #endif
                   1791:                *q++ = *p--;
                   1792:        }
                   1793:        /*
                   1794:         * Last hop goes to final destination.
                   1795:         */
                   1796:        *q = ip_srcrt.dst;
                   1797: #ifdef DIAGNOSTIC
                   1798:        if (ipprintfs)
1.39      christos 1799:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1800: #endif
                   1801:        return (m);
                   1802: }
                   1803:
1.139     matt     1804: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1805:        [PRC_MSGSIZE] = EMSGSIZE,
                   1806:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1807:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1808:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1809:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1810:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1811:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1812:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1813:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1814: };
                   1815:
                   1816: /*
                   1817:  * Forward a packet.  If some error occurs return the sender
                   1818:  * an icmp packet.  Note we can't always generate a meaningful
                   1819:  * icmp message because icmp doesn't have a large enough repertoire
                   1820:  * of codes and types.
                   1821:  *
                   1822:  * If not forwarding, just drop the packet.  This could be confusing
                   1823:  * if ipforwarding was zero but some routing protocol was advancing
                   1824:  * us as a gateway to somewhere.  However, we must let the routing
                   1825:  * protocol deal with that.
                   1826:  *
                   1827:  * The srcrt parameter indicates whether the packet is being forwarded
                   1828:  * via a source route.
                   1829:  */
1.13      mycroft  1830: void
1.211     perry    1831: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1832: {
1.109     augustss 1833:        struct ip *ip = mtod(m, struct ip *);
                   1834:        struct rtentry *rt;
1.220     christos 1835:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1836:        struct mbuf *mcopy;
1.13      mycroft  1837:        n_long dest;
1.249     dyoung   1838:        union {
                   1839:                struct sockaddr         dst;
                   1840:                struct sockaddr_in      dst4;
                   1841:        } u;
1.164     matt     1842:
                   1843:        /*
                   1844:         * We are now in the output path.
                   1845:         */
                   1846:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1847:
                   1848:        /*
                   1849:         * Clear any in-bound checksum flags for this packet.
                   1850:         */
                   1851:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1852:
1.13      mycroft  1853:        dest = 0;
1.1       cgd      1854: #ifdef DIAGNOSTIC
1.224     joerg    1855:        if (ipprintfs) {
                   1856:                printf("forward: src %s ", inet_ntoa(ip->ip_src));
                   1857:                printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
                   1858:        }
1.1       cgd      1859: #endif
1.93      sommerfe 1860:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1861:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1862:                m_freem(m);
                   1863:                return;
                   1864:        }
                   1865:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1866:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1867:                return;
                   1868:        }
                   1869:
1.249     dyoung   1870:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
                   1871:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1872:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1873:                return;
1.1       cgd      1874:        }
                   1875:
                   1876:        /*
1.34      mycroft  1877:         * Save at most 68 bytes of the packet in case
1.1       cgd      1878:         * we need to generate an ICMP message to the src.
1.119     itojun   1879:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1880:         */
1.155     itojun   1881:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1882:        if (mcopy)
                   1883:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1884:
1.221     christos 1885:        ip->ip_ttl -= IPTTLDEC;
                   1886:
1.1       cgd      1887:        /*
                   1888:         * If forwarding packet using same interface that it came in on,
                   1889:         * perhaps should send a redirect to sender to shortcut a hop.
                   1890:         * Only send redirect if source is sending directly to us,
                   1891:         * and if packet was not source routed (or has any options).
                   1892:         * Also, don't send redirect if forwarding using a default route
                   1893:         * or a route modified by a redirect.
                   1894:         */
                   1895:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1896:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1897:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1898:            ipsendredirects && !srcrt) {
1.19      mycroft  1899:                if (rt->rt_ifa &&
                   1900:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1901:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1902:                        if (rt->rt_flags & RTF_GATEWAY)
                   1903:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1904:                        else
                   1905:                                dest = ip->ip_dst.s_addr;
                   1906:                        /*
                   1907:                         * Router requirements says to only send host
                   1908:                         * redirects.
                   1909:                         */
                   1910:                        type = ICMP_REDIRECT;
                   1911:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1912: #ifdef DIAGNOSTIC
1.77      thorpej  1913:                        if (ipprintfs)
                   1914:                                printf("redirect (%d) to %x\n", code,
                   1915:                                    (u_int32_t)dest);
1.1       cgd      1916: #endif
                   1917:                }
                   1918:        }
                   1919:
1.238     dyoung   1920:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1921:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1922:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1923:
1.1       cgd      1924:        if (error)
1.266     thorpej  1925:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1926:        else {
1.266     thorpej  1927:                uint64_t *ips = IP_STAT_GETREF();
                   1928:                ips[IP_STAT_FORWARD]++;
                   1929:                if (type) {
                   1930:                        ips[IP_STAT_REDIRECTSENT]++;
                   1931:                        IP_STAT_PUTREF();
                   1932:                } else {
                   1933:                        IP_STAT_PUTREF();
1.63      matt     1934:                        if (mcopy) {
                   1935: #ifdef GATEWAY
1.64      thorpej  1936:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1937:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1938: #endif
1.1       cgd      1939:                                m_freem(mcopy);
1.63      matt     1940:                        }
1.1       cgd      1941:                        return;
                   1942:                }
                   1943:        }
                   1944:        if (mcopy == NULL)
                   1945:                return;
1.13      mycroft  1946:
1.1       cgd      1947:        switch (error) {
                   1948:
                   1949:        case 0:                         /* forwarded, but need redirect */
                   1950:                /* type, code set above */
                   1951:                break;
                   1952:
                   1953:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1954:        case EHOSTUNREACH:
                   1955:        case ENETDOWN:
                   1956:        case EHOSTDOWN:
                   1957:        default:
                   1958:                type = ICMP_UNREACH;
                   1959:                code = ICMP_UNREACH_HOST;
                   1960:                break;
                   1961:
                   1962:        case EMSGSIZE:
                   1963:                type = ICMP_UNREACH;
                   1964:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1965:
1.261     dyoung   1966:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL) {
1.263     cube     1967:
                   1968: #if defined(IPSEC) || defined(FAST_IPSEC)
                   1969:                        /*
                   1970:                         * If the packet is routed over IPsec tunnel, tell the
                   1971:                         * originator the tunnel MTU.
                   1972:                         *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1973:                         * XXX quickhack!!!
                   1974:                         */
                   1975:
1.89      itojun   1976:                        struct secpolicy *sp;
                   1977:                        int ipsecerror;
1.95      itojun   1978:                        size_t ipsechdr;
1.89      itojun   1979:                        struct route *ro;
                   1980:
                   1981:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1982:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1983:                            &ipsecerror);
1.263     cube     1984: #endif
1.89      itojun   1985:
1.263     cube     1986:                        destmtu = rt->rt_ifp->if_mtu;
                   1987: #if defined(IPSEC) || defined(FAST_IPSEC)
                   1988:                        if (sp != NULL) {
1.89      itojun   1989:                                /* count IPsec header size */
1.95      itojun   1990:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1991:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1992:
                   1993:                                /*
                   1994:                                 * find the correct route for outer IPv4
                   1995:                                 * header, compute tunnel MTU.
                   1996:                                 */
1.220     christos 1997:
1.89      itojun   1998:                                if (sp->req != NULL
1.95      itojun   1999:                                 && sp->req->sav != NULL
                   2000:                                 && sp->req->sav->sah != NULL) {
                   2001:                                        ro = &sp->req->sav->sah->sa_route;
1.257     dyoung   2002:                                        if (rt && rt->rt_ifp) {
1.220     christos 2003:                                                destmtu =
1.257     dyoung   2004:                                                    rt->rt_rmx.rmx_mtu ?
                   2005:                                                    rt->rt_rmx.rmx_mtu :
                   2006:                                                    rt->rt_ifp->if_mtu;
1.220     christos 2007:                                                destmtu -= ipsechdr;
1.89      itojun   2008:                                        }
                   2009:                                }
                   2010:
1.173     jonathan 2011: #ifdef IPSEC
1.89      itojun   2012:                                key_freesp(sp);
1.173     jonathan 2013: #else
                   2014:                                KEY_FREESP(&sp);
                   2015: #endif
1.89      itojun   2016:                        }
1.263     cube     2017: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.89      itojun   2018:                }
1.266     thorpej  2019:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      2020:                break;
                   2021:
                   2022:        case ENOBUFS:
1.143     itojun   2023: #if 1
                   2024:                /*
                   2025:                 * a router should not generate ICMP_SOURCEQUENCH as
                   2026:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   2027:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      2028:                 * or if the underlying interface is rate-limited.
1.143     itojun   2029:                 */
                   2030:                if (mcopy)
                   2031:                        m_freem(mcopy);
                   2032:                return;
                   2033: #else
1.1       cgd      2034:                type = ICMP_SOURCEQUENCH;
                   2035:                code = 0;
                   2036:                break;
1.143     itojun   2037: #endif
1.1       cgd      2038:        }
1.220     christos 2039:        icmp_error(mcopy, type, code, dest, destmtu);
1.44      thorpej  2040: }
                   2041:
                   2042: void
1.211     perry    2043: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   2044:     struct mbuf *m)
1.44      thorpej  2045: {
                   2046:
                   2047:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   2048:                struct timeval tv;
                   2049:
                   2050:                microtime(&tv);
1.244     christos 2051:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  2052:                    SCM_TIMESTAMP, SOL_SOCKET);
                   2053:                if (*mp)
                   2054:                        mp = &(*mp)->m_next;
                   2055:        }
                   2056:        if (inp->inp_flags & INP_RECVDSTADDR) {
1.244     christos 2057:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  2058:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   2059:                if (*mp)
                   2060:                        mp = &(*mp)->m_next;
                   2061:        }
                   2062: #ifdef notyet
                   2063:        /*
                   2064:         * XXX
                   2065:         * Moving these out of udp_input() made them even more broken
                   2066:         * than they already were.
                   2067:         *      - fenner@parc.xerox.com
                   2068:         */
                   2069:        /* options were tossed already */
                   2070:        if (inp->inp_flags & INP_RECVOPTS) {
1.244     christos 2071:                *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44      thorpej  2072:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   2073:                if (*mp)
                   2074:                        mp = &(*mp)->m_next;
                   2075:        }
                   2076:        /* ip_srcroute doesn't do what we want here, need to fix */
                   2077:        if (inp->inp_flags & INP_RECVRETOPTS) {
1.244     christos 2078:                *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44      thorpej  2079:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   2080:                if (*mp)
                   2081:                        mp = &(*mp)->m_next;
                   2082:        }
                   2083: #endif
                   2084:        if (inp->inp_flags & INP_RECVIF) {
                   2085:                struct sockaddr_dl sdl;
                   2086:
1.252     dyoung   2087:                sockaddr_dl_init(&sdl, sizeof(sdl),
                   2088:                    (m->m_pkthdr.rcvif != NULL)
                   2089:                        ?  m->m_pkthdr.rcvif->if_index
                   2090:                        : 0,
                   2091:                        0, NULL, 0, NULL, 0);
1.251     dyoung   2092:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  2093:                if (*mp)
                   2094:                        mp = &(*mp)->m_next;
                   2095:        }
1.13      mycroft  2096: }
                   2097:
1.189     atatat   2098: /*
1.228     elad     2099:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   2100:  */
                   2101: static int
                   2102: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   2103: {
                   2104:        int error, tmp;
                   2105:        struct sysctlnode node;
                   2106:
                   2107:        node = *rnode;
                   2108:        tmp = ip_forwsrcrt;
                   2109:        node.sysctl_data = &tmp;
                   2110:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2111:        if (error || newp == NULL)
                   2112:                return (error);
                   2113:
1.230     elad     2114:        if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232     elad     2115:            0, NULL, NULL, NULL))
1.228     elad     2116:                return (EPERM);
                   2117:
                   2118:        ip_forwsrcrt = tmp;
                   2119:
                   2120:        return (0);
                   2121: }
                   2122:
                   2123: /*
1.189     atatat   2124:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   2125:  * range of the new value and tweaks timers if it changes.
                   2126:  */
                   2127: static int
                   2128: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  2129: {
1.189     atatat   2130:        int error, tmp;
                   2131:        struct sysctlnode node;
                   2132:
                   2133:        node = *rnode;
                   2134:        tmp = ip_mtudisc_timeout;
                   2135:        node.sysctl_data = &tmp;
                   2136:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2137:        if (error || newp == NULL)
                   2138:                return (error);
                   2139:        if (tmp < 0)
                   2140:                return (EINVAL);
1.52      thorpej  2141:
1.189     atatat   2142:        ip_mtudisc_timeout = tmp;
                   2143:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   2144:
                   2145:        return (0);
                   2146: }
1.54      lukem    2147:
1.65      matt     2148: #ifdef GATEWAY
1.189     atatat   2149: /*
1.247     liamjfoy 2150:  * sysctl helper routine for net.inet.ip.maxflows.
1.189     atatat   2151:  */
                   2152: static int
                   2153: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   2154: {
                   2155:        int s;
1.67      thorpej  2156:
1.217     atatat   2157:        s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247     liamjfoy 2158:        if (s || newp == NULL)
1.189     atatat   2159:                return (s);
1.212     perry    2160:
1.189     atatat   2161:        s = splsoftnet();
1.265     thorpej  2162:        ipflow_prune();
1.189     atatat   2163:        splx(s);
1.144     martin   2164:
1.189     atatat   2165:        return (0);
                   2166: }
1.248     liamjfoy 2167:
                   2168: static int
                   2169: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
                   2170: {
                   2171:        int error, tmp;
                   2172:        struct sysctlnode node;
                   2173:
                   2174:        node = *rnode;
                   2175:        tmp = ip_hashsize;
                   2176:        node.sysctl_data = &tmp;
                   2177:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2178:        if (error || newp == NULL)
                   2179:                return (error);
                   2180:
                   2181:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   2182:                /*
                   2183:                 * Can only fail due to malloc()
                   2184:                 */
                   2185:                if (ipflow_invalidate_all(tmp))
                   2186:                        return ENOMEM;
                   2187:        } else {
                   2188:                /*
                   2189:                 * EINVAL if not a power of 2
                   2190:                 */
                   2191:                return EINVAL;
                   2192:        }
                   2193:
                   2194:        return (0);
                   2195: }
1.189     atatat   2196: #endif /* GATEWAY */
1.117     tron     2197:
1.266     thorpej  2198: static int
                   2199: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   2200: {
1.267   ! thorpej  2201:        netstat_sysctl_context ctx;
1.266     thorpej  2202:        uint64_t ips[IP_NSTATS];
                   2203:
1.267   ! thorpej  2204:        ctx.ctx_stat = ipstat_percpu;
        !          2205:        ctx.ctx_counters = ips;
        !          2206:        ctx.ctx_ncounters = IP_NSTATS;
        !          2207:        return (NETSTAT_SYSCTL(&ctx));
1.266     thorpej  2208: }
1.131     itojun   2209:
1.189     atatat   2210: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
                   2211: {
                   2212:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 2213:
1.197     atatat   2214:        sysctl_createv(clog, 0, NULL, NULL,
                   2215:                       CTLFLAG_PERMANENT,
1.189     atatat   2216:                       CTLTYPE_NODE, "net", NULL,
                   2217:                       NULL, 0, NULL, 0,
                   2218:                       CTL_NET, CTL_EOL);
1.197     atatat   2219:        sysctl_createv(clog, 0, NULL, NULL,
                   2220:                       CTLFLAG_PERMANENT,
1.203     atatat   2221:                       CTLTYPE_NODE, "inet",
                   2222:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   2223:                       NULL, 0, NULL, 0,
                   2224:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   2225:        sysctl_createv(clog, 0, NULL, NULL,
                   2226:                       CTLFLAG_PERMANENT,
1.203     atatat   2227:                       CTLTYPE_NODE, "ip",
                   2228:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   2229:                       NULL, 0, NULL, 0,
                   2230:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    2231:
1.197     atatat   2232:        sysctl_createv(clog, 0, NULL, NULL,
                   2233:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2234:                       CTLTYPE_INT, "forwarding",
                   2235:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   2236:                       NULL, 0, &ipforwarding, 0,
                   2237:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2238:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   2239:        sysctl_createv(clog, 0, NULL, NULL,
                   2240:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2241:                       CTLTYPE_INT, "redirect",
                   2242:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   2243:                       NULL, 0, &ipsendredirects, 0,
                   2244:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2245:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   2246:        sysctl_createv(clog, 0, NULL, NULL,
                   2247:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2248:                       CTLTYPE_INT, "ttl",
                   2249:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   2250:                       NULL, 0, &ip_defttl, 0,
                   2251:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2252:                       IPCTL_DEFTTL, CTL_EOL);
                   2253: #ifdef IPCTL_DEFMTU
1.197     atatat   2254:        sysctl_createv(clog, 0, NULL, NULL,
                   2255:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   2256:                       CTLTYPE_INT, "mtu",
                   2257:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   2258:                       NULL, 0, &ip_mtu, 0,
                   2259:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2260:                       IPCTL_DEFMTU, CTL_EOL);
                   2261: #endif /* IPCTL_DEFMTU */
1.197     atatat   2262:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     2263:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2264:                       CTLTYPE_INT, "forwsrcrt",
                   2265:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   2266:                                    "datagrams"),
1.228     elad     2267:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   2268:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2269:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   2270:        sysctl_createv(clog, 0, NULL, NULL,
                   2271:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2272:                       CTLTYPE_INT, "directed-broadcast",
                   2273:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   2274:                       NULL, 0, &ip_directedbcast, 0,
                   2275:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2276:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   2277:        sysctl_createv(clog, 0, NULL, NULL,
                   2278:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2279:                       CTLTYPE_INT, "allowsrcrt",
                   2280:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   2281:                       NULL, 0, &ip_allowsrcrt, 0,
                   2282:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2283:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   2284:        sysctl_createv(clog, 0, NULL, NULL,
                   2285:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2286:                       CTLTYPE_INT, "subnetsarelocal",
                   2287:                       SYSCTL_DESCR("Whether logical subnets are considered "
                   2288:                                    "local"),
1.189     atatat   2289:                       NULL, 0, &subnetsarelocal, 0,
                   2290:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2291:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   2292:        sysctl_createv(clog, 0, NULL, NULL,
                   2293:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2294:                       CTLTYPE_INT, "mtudisc",
                   2295:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   2296:                       NULL, 0, &ip_mtudisc, 0,
                   2297:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2298:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   2299:        sysctl_createv(clog, 0, NULL, NULL,
                   2300:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2301:                       CTLTYPE_INT, "anonportmin",
                   2302:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   2303:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   2304:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2305:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   2306:        sysctl_createv(clog, 0, NULL, NULL,
                   2307:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2308:                       CTLTYPE_INT, "anonportmax",
                   2309:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   2310:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   2311:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2312:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   2313:        sysctl_createv(clog, 0, NULL, NULL,
                   2314:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2315:                       CTLTYPE_INT, "mtudisctimeout",
                   2316:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   2317:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   2318:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2319:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   2320: #ifdef GATEWAY
1.197     atatat   2321:        sysctl_createv(clog, 0, NULL, NULL,
                   2322:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2323:                       CTLTYPE_INT, "maxflows",
                   2324:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   2325:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   2326:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2327:                       IPCTL_MAXFLOWS, CTL_EOL);
1.248     liamjfoy 2328:        sysctl_createv(clog, 0, NULL, NULL,
                   2329:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2330:                        CTLTYPE_INT, "hashsize",
                   2331:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
                   2332:                        sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
                   2333:                        CTL_NET, PF_INET, IPPROTO_IP,
                   2334:                        CTL_CREATE, CTL_EOL);
1.189     atatat   2335: #endif /* GATEWAY */
1.197     atatat   2336:        sysctl_createv(clog, 0, NULL, NULL,
                   2337:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2338:                       CTLTYPE_INT, "hostzerobroadcast",
                   2339:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   2340:                       NULL, 0, &hostzeroisbroadcast, 0,
                   2341:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2342:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   2343: #if NGIF > 0
1.197     atatat   2344:        sysctl_createv(clog, 0, NULL, NULL,
                   2345:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2346:                       CTLTYPE_INT, "gifttl",
                   2347:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   2348:                       NULL, 0, &ip_gif_ttl, 0,
                   2349:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2350:                       IPCTL_GIF_TTL, CTL_EOL);
                   2351: #endif /* NGIF */
                   2352: #ifndef IPNOPRIVPORTS
1.197     atatat   2353:        sysctl_createv(clog, 0, NULL, NULL,
                   2354:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2355:                       CTLTYPE_INT, "lowportmin",
                   2356:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   2357:                                    "to assign"),
1.189     atatat   2358:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   2359:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2360:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   2361:        sysctl_createv(clog, 0, NULL, NULL,
                   2362:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2363:                       CTLTYPE_INT, "lowportmax",
                   2364:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   2365:                                    "to assign"),
1.189     atatat   2366:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   2367:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2368:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   2369: #endif /* IPNOPRIVPORTS */
1.197     atatat   2370:        sysctl_createv(clog, 0, NULL, NULL,
                   2371:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2372:                       CTLTYPE_INT, "maxfragpackets",
                   2373:                       SYSCTL_DESCR("Maximum number of fragments to retain for "
                   2374:                                    "possible reassembly"),
1.189     atatat   2375:                       NULL, 0, &ip_maxfragpackets, 0,
                   2376:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2377:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
                   2378: #if NGRE > 0
1.197     atatat   2379:        sysctl_createv(clog, 0, NULL, NULL,
                   2380:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2381:                       CTLTYPE_INT, "grettl",
                   2382:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   2383:                       NULL, 0, &ip_gre_ttl, 0,
                   2384:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2385:                       IPCTL_GRE_TTL, CTL_EOL);
                   2386: #endif /* NGRE */
1.197     atatat   2387:        sysctl_createv(clog, 0, NULL, NULL,
                   2388:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2389:                       CTLTYPE_INT, "checkinterface",
                   2390:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   2391:                                    "from RFC1122"),
1.189     atatat   2392:                       NULL, 0, &ip_checkinterface, 0,
                   2393:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2394:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   2395:        sysctl_createv(clog, 0, NULL, NULL,
                   2396:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2397:                       CTLTYPE_INT, "random_id",
                   2398:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   2399:                       NULL, 0, &ip_do_randomid, 0,
                   2400:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2401:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  2402:        sysctl_createv(clog, 0, NULL, NULL,
                   2403:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2404:                       CTLTYPE_INT, "do_loopback_cksum",
                   2405:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   2406:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   2407:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2408:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     2409:        sysctl_createv(clog, 0, NULL, NULL,
                   2410:                       CTLFLAG_PERMANENT,
                   2411:                       CTLTYPE_STRUCT, "stats",
                   2412:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  2413:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     2414:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   2415:                       CTL_EOL);
1.1       cgd      2416: }
1.266     thorpej  2417:
                   2418: void
                   2419: ip_statinc(u_int stat)
                   2420: {
                   2421:
                   2422:        KASSERT(stat < IP_NSTATS);
                   2423:        IP_STATINC(stat);
                   2424: }

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