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Annotation of src/sys/netinet/ip_input.c, Revision 1.284.2.3

1.284.2.3! uebayasi    1: /*     $NetBSD: ip_input.c,v 1.284.2.2 2010/08/17 06:47:46 uebayasi Exp $      */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.284.2.3! uebayasi   94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.284.2.2 2010/08/17 06:47:46 uebayasi Exp $");
1.55      scottr     95:
1.184     jonathan   96: #include "opt_inet.h"
1.278     christos   97: #include "opt_compat_netbsd.h"
1.62      matt       98: #include "opt_gateway.h"
1.69      mrg        99: #include "opt_pfil_hooks.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.1       cgd       104:
1.5       mycroft   105: #include <sys/param.h>
                    106: #include <sys/systm.h>
                    107: #include <sys/mbuf.h>
                    108: #include <sys/domain.h>
                    109: #include <sys/protosw.h>
                    110: #include <sys/socket.h>
1.44      thorpej   111: #include <sys/socketvar.h>
1.5       mycroft   112: #include <sys/errno.h>
                    113: #include <sys/time.h>
                    114: #include <sys/kernel.h>
1.72      thorpej   115: #include <sys/pool.h>
1.28      christos  116: #include <sys/sysctl.h>
1.230     elad      117: #include <sys/kauth.h>
1.1       cgd       118:
1.5       mycroft   119: #include <net/if.h>
1.44      thorpej   120: #include <net/if_dl.h>
1.5       mycroft   121: #include <net/route.h>
1.45      mrg       122: #include <net/pfil.h>
1.1       cgd       123:
1.5       mycroft   124: #include <netinet/in.h>
                    125: #include <netinet/in_systm.h>
                    126: #include <netinet/ip.h>
                    127: #include <netinet/in_pcb.h>
1.215     yamt      128: #include <netinet/in_proto.h>
1.5       mycroft   129: #include <netinet/in_var.h>
                    130: #include <netinet/ip_var.h>
1.266     thorpej   131: #include <netinet/ip_private.h>
1.5       mycroft   132: #include <netinet/ip_icmp.h>
1.89      itojun    133: /* just for gif_ttl */
                    134: #include <netinet/in_gif.h>
                    135: #include "gif.h"
1.144     martin    136: #include <net/if_gre.h>
                    137: #include "gre.h"
1.111     jdolecek  138:
                    139: #ifdef MROUTING
                    140: #include <netinet/ip_mroute.h>
                    141: #endif
1.89      itojun    142:
                    143: #ifdef IPSEC
                    144: #include <netinet6/ipsec.h>
1.267     thorpej   145: #include <netinet6/ipsec_private.h>
1.89      itojun    146: #include <netkey/key.h>
                    147: #endif
1.173     jonathan  148: #ifdef FAST_IPSEC
                    149: #include <netipsec/ipsec.h>
                    150: #include <netipsec/key.h>
                    151: #endif /* FAST_IPSEC*/
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    156: #else /* GATEWAY */
                    157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    158: #endif /* GATEWAY */
                    159: #endif /* IPFORWARDING */
                    160: #ifndef        IPSENDREDIRECTS
                    161: #define        IPSENDREDIRECTS 1
                    162: #endif
1.26      thorpej   163: #ifndef IPFORWSRCRT
1.47      cjs       164: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    165: #endif
                    166: #ifndef IPALLOWSRCRT
1.48      mrg       167: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   168: #endif
1.53      kml       169: #ifndef IPMTUDISC
1.153     itojun    170: #define IPMTUDISC      1
1.53      kml       171: #endif
1.60      kml       172: #ifndef IPMTUDISCTIMEOUT
1.61      kml       173: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       174: #endif
1.53      kml       175:
1.278     christos  176: #ifdef COMPAT_50
                    177: #include <compat/sys/time.h>
                    178: #include <compat/sys/socket.h>
                    179: #endif
                    180:
1.27      thorpej   181: /*
                    182:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    183:  * configuration using this option will Just Work.
                    184:  */
                    185: #ifndef IPDIRECTEDBCAST
                    186: #ifdef DIRECTED_BROADCAST
                    187: #define IPDIRECTEDBCAST        1
                    188: #else
                    189: #define        IPDIRECTEDBCAST 0
                    190: #endif /* DIRECTED_BROADCAST */
                    191: #endif /* IPDIRECTEDBCAST */
1.1       cgd       192: int    ipforwarding = IPFORWARDING;
                    193: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   194: int    ip_defttl = IPDEFTTL;
1.26      thorpej   195: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   196: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       197: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       198: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    199: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       200: #ifdef DIAGNOSTIC
                    201: int    ipprintfs = 0;
                    202: #endif
1.184     jonathan  203:
                    204: int    ip_do_randomid = 0;
                    205:
1.165     christos  206: /*
                    207:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    208:  * the Strong ES model described in RFC 1122, but since the routing table
                    209:  * and transmit implementation do not implement the Strong ES model,
                    210:  * setting this to 1 results in an odd hybrid.
                    211:  *
                    212:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    213:  * to translate the destination address to another local interface.
                    214:  *
                    215:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    216:  * to the loopback interface instead of the interface where the
                    217:  * packets for those addresses are received.
                    218:  */
                    219: int    ip_checkinterface = 0;
                    220:
1.1       cgd       221:
1.60      kml       222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    223:
1.1       cgd       224: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      225: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    226: int    in_ifaddrentries;                       /* total number of addrs */
1.212     perry     227: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       228: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      229: u_long in_multihash;                           /* size of hash table - 1 */
                    230: int    in_multientries;                        /* total number of addrs */
                    231: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   232: struct ifqueue ipintrq;
1.284.2.1  uebayasi  233:
1.284.2.3! uebayasi  234: ipid_state_t *         ip_ids;
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:
1.275     pooka     243: struct pool inmulti_pool;
1.72      thorpej   244:
1.135     thorpej   245: #ifdef INET_CSUM_COUNTERS
                    246: #include <sys/device.h>
                    247:
                    248: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    249:     NULL, "inet", "hwcsum bad");
                    250: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    251:     NULL, "inet", "hwcsum ok");
                    252: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    253:     NULL, "inet", "swcsum");
                    254:
                    255: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    256:
1.201     matt      257: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    258: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    259: EVCNT_ATTACH_STATIC(ip_swcsum);
                    260:
1.135     thorpej   261: #else
                    262:
                    263: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    264:
                    265: #endif /* INET_CSUM_COUNTERS */
                    266:
1.1       cgd       267: /*
                    268:  * We need to save the IP options in case a protocol wants to respond
                    269:  * to an incoming packet over the same route if the packet got here
                    270:  * using IP source routing.  This allows connection establishment and
                    271:  * maintenance when the remote end is on a network that is not known
                    272:  * to us.
                    273:  */
                    274: int    ip_nhops = 0;
                    275: static struct ip_srcrt {
                    276:        struct  in_addr dst;                    /* final destination */
                    277:        char    nop;                            /* one NOP to align */
                    278:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    279:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    280: } ip_srcrt;
                    281:
1.210     perry     282: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   283:
1.164     matt      284: #ifdef MBUFTRACE
1.234     dogcow    285: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    286: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      287: #endif
                    288:
1.284     pooka     289: static void sysctl_net_inet_ip_setup(struct sysctllog **);
                    290:
1.1       cgd       291: /*
                    292:  * IP initialization: fill in IP protocol switch table.
                    293:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    294:  */
1.8       mycroft   295: void
1.211     perry     296: ip_init(void)
1.1       cgd       297: {
1.199     matt      298:        const struct protosw *pr;
1.109     augustss  299:        int i;
1.1       cgd       300:
1.284     pooka     301:        sysctl_net_inet_ip_setup(NULL);
                    302:
1.275     pooka     303:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    304:            NULL, IPL_SOFTNET);
                    305:
1.1       cgd       306:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    307:        if (pr == 0)
                    308:                panic("ip_init");
                    309:        for (i = 0; i < IPPROTO_MAX; i++)
                    310:                ip_protox[i] = pr - inetsw;
                    311:        for (pr = inetdomain.dom_protosw;
                    312:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    313:                if (pr->pr_domain->dom_family == PF_INET &&
                    314:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    315:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  316:
1.284.2.2  uebayasi  317:        ip_reass_init();
1.190     jonathan  318:
1.284.2.3! uebayasi  319:        ip_ids = ip_id_init();
1.227     kardel    320:        ip_id = time_second & 0xfffff;
1.194     jonathan  321:
1.1       cgd       322:        ipintrq.ifq_maxlen = ipqmaxlen;
1.194     jonathan  323:
1.181     jonathan  324:        TAILQ_INIT(&in_ifaddrhead);
1.272     ad        325:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
                    326:            &in_ifaddrhash);
                    327:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
                    328:            &in_multihash);
1.160     itojun    329:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   330: #ifdef GATEWAY
1.248     liamjfoy  331:        ipflow_init(ip_hashsize);
1.73      thorpej   332: #endif
1.121     thorpej   333:
                    334: #ifdef PFIL_HOOKS
                    335:        /* Register our Packet Filter hook. */
1.126     thorpej   336:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    337:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   338:        i = pfil_head_register(&inet_pfil_hook);
                    339:        if (i != 0)
                    340:                printf("ip_init: WARNING: unable to register pfil hook, "
                    341:                    "error %d\n", i);
                    342: #endif /* PFIL_HOOKS */
1.135     thorpej   343:
1.164     matt      344: #ifdef MBUFTRACE
                    345:        MOWNER_ATTACH(&ip_tx_mowner);
                    346:        MOWNER_ATTACH(&ip_rx_mowner);
                    347: #endif /* MBUFTRACE */
1.266     thorpej   348:
                    349:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       350: }
                    351:
1.229     christos  352: struct sockaddr_in ipaddr = {
                    353:        .sin_len = sizeof(ipaddr),
                    354:        .sin_family = AF_INET,
                    355: };
1.1       cgd       356: struct route ipforward_rt;
                    357:
                    358: /*
1.89      itojun    359:  * IP software interrupt routine
                    360:  */
                    361: void
1.211     perry     362: ipintr(void)
1.89      itojun    363: {
                    364:        int s;
                    365:        struct mbuf *m;
1.284.2.1  uebayasi  366:        struct ifqueue lcl_intrq;
                    367:
                    368:        memset(&lcl_intrq, 0, sizeof(lcl_intrq));
                    369:        ipintrq.ifq_maxlen = ipqmaxlen;
1.89      itojun    370:
1.268     ad        371:        mutex_enter(softnet_lock);
                    372:        KERNEL_LOCK(1, NULL);
1.284.2.1  uebayasi  373:        if (!IF_IS_EMPTY(&ipintrq)) {
1.132     thorpej   374:                s = splnet();
1.284.2.1  uebayasi  375:
                    376:                /* Take existing queue onto stack */
                    377:                lcl_intrq = ipintrq;
                    378:
                    379:                /* Zero out global queue, preserving maxlen and drops */
                    380:                ipintrq.ifq_head = NULL;
                    381:                ipintrq.ifq_tail = NULL;
                    382:                ipintrq.ifq_len = 0;
                    383:                ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
                    384:                ipintrq.ifq_drops = lcl_intrq.ifq_drops;
                    385:
1.89      itojun    386:                splx(s);
1.284.2.1  uebayasi  387:        }
                    388:        KERNEL_UNLOCK_ONE(NULL);
                    389:        while (!IF_IS_EMPTY(&lcl_intrq)) {
                    390:                IF_DEQUEUE(&lcl_intrq, m);
1.268     ad        391:                if (m == NULL)
                    392:                        break;
1.89      itojun    393:                ip_input(m);
                    394:        }
1.268     ad        395:        mutex_exit(softnet_lock);
1.89      itojun    396: }
                    397:
                    398: /*
1.1       cgd       399:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    400:  * try to reassemble.  Process options.  Pass to next level.
                    401:  */
1.8       mycroft   402: void
1.89      itojun    403: ip_input(struct mbuf *m)
1.1       cgd       404: {
1.109     augustss  405:        struct ip *ip = NULL;
                    406:        struct in_ifaddr *ia;
                    407:        struct ifaddr *ifa;
1.284.2.2  uebayasi  408:        int hlen = 0, len;
1.100     itojun    409:        int downmatch;
1.165     christos  410:        int checkif;
1.169     itojun    411:        int srcrt = 0;
1.173     jonathan  412: #ifdef FAST_IPSEC
                    413:        struct m_tag *mtag;
                    414:        struct tdb_ident *tdbi;
                    415:        struct secpolicy *sp;
1.284.2.2  uebayasi  416:        int error, s;
1.173     jonathan  417: #endif /* FAST_IPSEC */
1.1       cgd       418:
1.164     matt      419:        MCLAIM(m, &ip_rx_mowner);
1.284.2.2  uebayasi  420:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164     matt      421:
1.1       cgd       422:        /*
                    423:         * If no IP addresses have been set yet but the interfaces
                    424:         * are receiving, can't do anything with incoming packets yet.
                    425:         */
1.181     jonathan  426:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       427:                goto bad;
1.266     thorpej   428:        IP_STATINC(IP_STAT_TOTAL);
1.154     thorpej   429:        /*
                    430:         * If the IP header is not aligned, slurp it up into a new
                    431:         * mbuf with space for link headers, in the event we forward
                    432:         * it.  Otherwise, if it is aligned, make sure the entire
                    433:         * base IP header is in the first mbuf of the chain.
                    434:         */
1.244     christos  435:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   436:                if ((m = m_copyup(m, sizeof(struct ip),
                    437:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    438:                        /* XXXJRT new stat, please */
1.266     thorpej   439:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   440:                        return;
                    441:                }
                    442:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    443:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   444:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   445:                        return;
                    446:                }
1.1       cgd       447:        }
                    448:        ip = mtod(m, struct ip *);
1.13      mycroft   449:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   450:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   451:                goto bad;
                    452:        }
1.1       cgd       453:        hlen = ip->ip_hl << 2;
                    454:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   455:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       456:                goto bad;
                    457:        }
                    458:        if (hlen > m->m_len) {
                    459:                if ((m = m_pullup(m, hlen)) == 0) {
1.266     thorpej   460:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    461:                        return;
1.1       cgd       462:                }
                    463:                ip = mtod(m, struct ip *);
                    464:        }
1.98      thorpej   465:
1.85      hwr       466:        /*
1.99      thorpej   467:         * RFC1122: packets with a multicast source address are
1.98      thorpej   468:         * not allowed.
1.85      hwr       469:         */
                    470:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   471:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       472:                goto bad;
1.129     itojun    473:        }
                    474:
                    475:        /* 127/8 must not appear on wire - RFC1122 */
                    476:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    477:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    478:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   479:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    480:                        goto bad;
1.130     itojun    481:                }
1.85      hwr       482:        }
                    483:
1.135     thorpej   484:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   485:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   486:                 M_CSUM_IPv4_BAD)) {
                    487:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    488:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    489:                goto badcsum;
                    490:
                    491:        case M_CSUM_IPv4:
                    492:                /* Checksum was okay. */
                    493:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    494:                break;
                    495:
                    496:        default:
1.206     thorpej   497:                /*
                    498:                 * Must compute it ourselves.  Maybe skip checksum on
                    499:                 * loopback interfaces.
                    500:                 */
                    501:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    502:                                     IFF_LOOPBACK) || ip_do_loopback_cksum)) {
                    503:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    504:                        if (in_cksum(m, hlen) != 0)
                    505:                                goto badcsum;
                    506:                }
1.135     thorpej   507:                break;
1.1       cgd       508:        }
                    509:
1.121     thorpej   510:        /* Retrieve the packet length. */
                    511:        len = ntohs(ip->ip_len);
1.81      proff     512:
                    513:        /*
                    514:         * Check for additional length bogosity
                    515:         */
1.84      proff     516:        if (len < hlen) {
1.266     thorpej   517:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     518:                goto bad;
                    519:        }
1.1       cgd       520:
                    521:        /*
                    522:         * Check that the amount of data in the buffers
                    523:         * is as at least much as the IP header would have us expect.
                    524:         * Trim mbufs if longer than we expect.
                    525:         * Drop packet if shorter than we expect.
                    526:         */
1.35      mycroft   527:        if (m->m_pkthdr.len < len) {
1.266     thorpej   528:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       529:                goto bad;
                    530:        }
1.35      mycroft   531:        if (m->m_pkthdr.len > len) {
1.1       cgd       532:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   533:                        m->m_len = len;
                    534:                        m->m_pkthdr.len = len;
1.1       cgd       535:                } else
1.35      mycroft   536:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       537:        }
                    538:
1.193     scw       539: #if defined(IPSEC)
1.149     wiz       540:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    541:        m->m_flags &= ~M_CANFASTFWD;
                    542: #else
1.64      thorpej   543:        /*
                    544:         * Assume that we can create a fast-forward IP flow entry
                    545:         * based on this packet.
                    546:         */
                    547:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    548: #endif
1.64      thorpej   549:
1.36      mrg       550: #ifdef PFIL_HOOKS
1.33      mrg       551:        /*
1.64      thorpej   552:         * Run through list of hooks for input packets.  If there are any
                    553:         * filters which require that additional packets in the flow are
                    554:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    555:         * Note that filters must _never_ set this flag, as another filter
                    556:         * in the list may have previously cleared it.
1.33      mrg       557:         */
1.127     itojun    558:        /*
                    559:         * let ipfilter look at packet on the wire,
                    560:         * not the decapsulated packet.
                    561:         */
                    562: #ifdef IPSEC
1.136     itojun    563:        if (!ipsec_getnhist(m))
1.186     scw       564: #elif defined(FAST_IPSEC)
                    565:        if (!ipsec_indone(m))
1.127     itojun    566: #else
                    567:        if (1)
                    568: #endif
                    569:        {
1.169     itojun    570:                struct in_addr odst;
                    571:
                    572:                odst = ip->ip_dst;
1.127     itojun    573:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    574:                    PFIL_IN) != 0)
                    575:                        return;
1.127     itojun    576:                if (m == NULL)
                    577:                        return;
                    578:                ip = mtod(m, struct ip *);
1.142     darrenr   579:                hlen = ip->ip_hl << 2;
1.205     darrenr   580:                /*
                    581:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    582:                 * from generating ICMP redirects for packets that have
                    583:                 * been redirected by a hook back out on to the same LAN that
                    584:                 * they came from and is not an indication that the packet
                    585:                 * is being inffluenced by source routing options.  This
                    586:                 * allows things like
                    587:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    588:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    589:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    590:                 * also requires a "map tlp0 ..." to complete the story.
                    591:                 * One might argue whether or not this kind of network config.
1.212     perry     592:                 * should be supported in this manner...
1.205     darrenr   593:                 */
1.169     itojun    594:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    595:        }
1.36      mrg       596: #endif /* PFIL_HOOKS */
1.123     thorpej   597:
                    598: #ifdef ALTQ
                    599:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    600:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    601:                /* packet dropped by traffic conditioner */
                    602:                return;
                    603:        }
                    604: #endif
1.121     thorpej   605:
                    606:        /*
1.1       cgd       607:         * Process options and, if not destined for us,
                    608:         * ship it on.  ip_dooptions returns 1 when an
                    609:         * error was detected (causing an icmp message
                    610:         * to be sent and the original packet to be freed).
                    611:         */
                    612:        ip_nhops = 0;           /* for source routed packets */
                    613:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    614:                return;
1.1       cgd       615:
                    616:        /*
1.165     christos  617:         * Enable a consistency check between the destination address
                    618:         * and the arrival interface for a unicast packet (the RFC 1122
                    619:         * strong ES model) if IP forwarding is disabled and the packet
                    620:         * is not locally generated.
                    621:         *
                    622:         * XXX - Checking also should be disabled if the destination
                    623:         * address is ipnat'ed to a different interface.
                    624:         *
                    625:         * XXX - Checking is incompatible with IP aliases added
                    626:         * to the loopback interface instead of the interface where
                    627:         * the packets are received.
                    628:         *
                    629:         * XXX - We need to add a per ifaddr flag for this so that
                    630:         * we get finer grain control.
                    631:         */
                    632:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    633:            (m->m_pkthdr.rcvif != NULL) &&
                    634:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    635:
                    636:        /*
1.1       cgd       637:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    638:         *
                    639:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    640:         * The behavior here is to treat addresses on !IFF_UP interface
                    641:         * as not mine.
1.1       cgd       642:         */
1.100     itojun    643:        downmatch = 0;
1.140     matt      644:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    645:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  646:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    647:                                continue;
1.97      itojun    648:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    649:                                break;
1.100     itojun    650:                        else
                    651:                                downmatch++;
1.97      itojun    652:                }
                    653:        }
1.86      thorpej   654:        if (ia != NULL)
                    655:                goto ours;
1.225     christos  656:        if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209     matt      657:                IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140     matt      658:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    659:                                continue;
1.57      tls       660:                        ia = ifatoia(ifa);
1.35      mycroft   661:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    662:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   663:                            /*
                    664:                             * Look for all-0's host part (old broadcast addr),
                    665:                             * either for subnet or net.
                    666:                             */
                    667:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   668:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       669:                                goto ours;
1.57      tls       670:                        /*
                    671:                         * An interface with IP address zero accepts
                    672:                         * all packets that arrive on that interface.
                    673:                         */
                    674:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    675:                                goto ours;
1.1       cgd       676:                }
                    677:        }
1.18      mycroft   678:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   679:                struct in_multi *inm;
                    680: #ifdef MROUTING
                    681:                extern struct socket *ip_mrouter;
1.10      brezak    682:
1.4       hpeyerl   683:                if (ip_mrouter) {
                    684:                        /*
                    685:                         * If we are acting as a multicast router, all
                    686:                         * incoming multicast packets are passed to the
                    687:                         * kernel-level multicast forwarding function.
                    688:                         * The packet is returned (relatively) intact; if
                    689:                         * ip_mforward() returns a non-zero value, the packet
                    690:                         * must be discarded, else it may be accepted below.
                    691:                         *
                    692:                         * (The IP ident field is put in the same byte order
                    693:                         * as expected when ip_mforward() is called from
                    694:                         * ip_output().)
                    695:                         */
1.13      mycroft   696:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266     thorpej   697:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   698:                                m_freem(m);
1.89      itojun    699:                                return;
1.4       hpeyerl   700:                        }
                    701:
                    702:                        /*
                    703:                         * The process-level routing demon needs to receive
                    704:                         * all multicast IGMP packets, whether or not this
                    705:                         * host belongs to their destination groups.
                    706:                         */
                    707:                        if (ip->ip_p == IPPROTO_IGMP)
                    708:                                goto ours;
1.266     thorpej   709:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   710:                }
                    711: #endif
                    712:                /*
                    713:                 * See if we belong to the destination multicast group on the
                    714:                 * arrival interface.
                    715:                 */
                    716:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    717:                if (inm == NULL) {
1.266     thorpej   718:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   719:                        m_freem(m);
1.89      itojun    720:                        return;
1.4       hpeyerl   721:                }
                    722:                goto ours;
                    723:        }
1.19      mycroft   724:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   725:            in_nullhost(ip->ip_dst))
1.1       cgd       726:                goto ours;
                    727:
                    728:        /*
                    729:         * Not for us; forward if possible and desirable.
                    730:         */
                    731:        if (ipforwarding == 0) {
1.266     thorpej   732:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       733:                m_freem(m);
1.100     itojun    734:        } else {
                    735:                /*
                    736:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    737:                 * and there's no IFF_UP interface that matches ip_dst,
                    738:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    739:                 * forwarding loop till TTL goes to 0.
                    740:                 */
                    741:                if (downmatch) {
                    742:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   743:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    744:                        return;
                    745:                }
1.145     itojun    746: #ifdef IPSEC
                    747:                if (ipsec4_in_reject(m, NULL)) {
1.267     thorpej   748:                        IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145     itojun    749:                        goto bad;
                    750:                }
                    751: #endif
1.173     jonathan  752: #ifdef FAST_IPSEC
                    753:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    754:                s = splsoftnet();
                    755:                if (mtag != NULL) {
                    756:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    757:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    758:                } else {
                    759:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     760:                                                   IP_FORWARDING, &error);
1.173     jonathan  761:                }
                    762:                if (sp == NULL) {       /* NB: can happen if error */
                    763:                        splx(s);
                    764:                        /*XXX error stat???*/
                    765:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    766:                        goto bad;
                    767:                }
                    768:
                    769:                /*
                    770:                 * Check security policy against packet attributes.
                    771:                 */
                    772:                error = ipsec_in_reject(sp, m);
                    773:                KEY_FREESP(&sp);
                    774:                splx(s);
                    775:                if (error) {
1.266     thorpej   776:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.173     jonathan  777:                        goto bad;
1.193     scw       778:                }
                    779:
                    780:                /*
                    781:                 * Peek at the outbound SP for this packet to determine if
                    782:                 * it's a Fast Forward candidate.
                    783:                 */
                    784:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    785:                if (mtag != NULL)
                    786:                        m->m_flags &= ~M_CANFASTFWD;
                    787:                else {
                    788:                        s = splsoftnet();
                    789:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    790:                            (IP_FORWARDING |
                    791:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    792:                            &error, NULL);
                    793:                        if (sp != NULL) {
                    794:                                m->m_flags &= ~M_CANFASTFWD;
                    795:                                KEY_FREESP(&sp);
                    796:                        }
                    797:                        splx(s);
1.173     jonathan  798:                }
                    799: #endif /* FAST_IPSEC */
1.145     itojun    800:
1.169     itojun    801:                ip_forward(m, srcrt);
1.100     itojun    802:        }
1.89      itojun    803:        return;
1.1       cgd       804:
                    805: ours:
                    806:        /*
                    807:         * If offset or IP_MF are set, must reassemble.
                    808:         */
1.155     itojun    809:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.284.2.2  uebayasi  810:                /*
                    811:                 * Pass to IP reassembly mechanism.
                    812:                 */
1.284.2.3! uebayasi  813:                if (ip_reass_packet(&m, ip) != 0) {
1.284.2.2  uebayasi  814:                        /* Failed; invalid fragment(s) or packet. */
                    815:                        goto bad;
                    816:                }
1.284.2.3! uebayasi  817:                if (m == NULL) {
1.284.2.2  uebayasi  818:                        /* More fragments should come; silently return. */
                    819:                        return;
                    820:                }
1.284.2.3! uebayasi  821:                /*
        !           822:                 * Reassembly is done, we have the final packet.
        !           823:                 * Updated cached data in local variable(s).
        !           824:                 */
1.284.2.2  uebayasi  825:                ip = mtod(m, struct ip *);
                    826:                hlen = ip->ip_hl << 2;
1.79      mycroft   827:        }
1.128     itojun    828:
1.173     jonathan  829: #if defined(IPSEC)
1.128     itojun    830:        /*
                    831:         * enforce IPsec policy checking if we are seeing last header.
                    832:         * note that we do not visit this with protocols with pcb layer
                    833:         * code - like udp/tcp/raw ip.
                    834:         */
                    835:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    836:            ipsec4_in_reject(m, NULL)) {
1.267     thorpej   837:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128     itojun    838:                goto bad;
                    839:        }
                    840: #endif
1.226     liamjfoy  841: #ifdef FAST_IPSEC
1.173     jonathan  842:        /*
                    843:         * enforce IPsec policy checking if we are seeing last header.
                    844:         * note that we do not visit this with protocols with pcb layer
                    845:         * code - like udp/tcp/raw ip.
                    846:         */
                    847:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    848:                /*
                    849:                 * Check if the packet has already had IPsec processing
                    850:                 * done.  If so, then just pass it along.  This tag gets
                    851:                 * set during AH, ESP, etc. input handling, before the
                    852:                 * packet is returned to the ip input queue for delivery.
1.212     perry     853:                 */
1.173     jonathan  854:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    855:                s = splsoftnet();
                    856:                if (mtag != NULL) {
                    857:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    858:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    859:                } else {
                    860:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     861:                                                   IP_FORWARDING, &error);
1.173     jonathan  862:                }
                    863:                if (sp != NULL) {
                    864:                        /*
                    865:                         * Check security policy against packet attributes.
                    866:                         */
                    867:                        error = ipsec_in_reject(sp, m);
                    868:                        KEY_FREESP(&sp);
                    869:                } else {
                    870:                        /* XXX error stat??? */
                    871:                        error = EINVAL;
                    872: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    873:                }
                    874:                splx(s);
                    875:                if (error)
                    876:                        goto bad;
                    877:        }
                    878: #endif /* FAST_IPSEC */
1.1       cgd       879:
                    880:        /*
                    881:         * Switch out to protocol's input routine.
                    882:         */
1.82      aidan     883: #if IFA_STATS
1.122     itojun    884:        if (ia && ip)
1.155     itojun    885:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     886: #endif
1.266     thorpej   887:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    888:     {
                    889:        int off = hlen, nh = ip->ip_p;
                    890:
                    891:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    892:        return;
                    893:     }
1.1       cgd       894: bad:
                    895:        m_freem(m);
1.135     thorpej   896:        return;
                    897:
                    898: badcsum:
1.266     thorpej   899:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej   900:        m_freem(m);
1.1       cgd       901: }
                    902:
                    903: /*
1.284.2.2  uebayasi  904:  * IP timer processing.
1.1       cgd       905:  */
1.8       mycroft   906: void
1.211     perry     907: ip_slowtimo(void)
1.1       cgd       908: {
1.268     ad        909:
                    910:        mutex_enter(softnet_lock);
                    911:        KERNEL_LOCK(1, NULL);
1.1       cgd       912:
1.284.2.2  uebayasi  913:        ip_reass_slowtimo();
1.268     ad        914:
                    915:        KERNEL_UNLOCK_ONE(NULL);
                    916:        mutex_exit(softnet_lock);
1.1       cgd       917: }
                    918:
                    919: /*
1.284.2.2  uebayasi  920:  * IP drain processing.
1.1       cgd       921:  */
1.8       mycroft   922: void
1.211     perry     923: ip_drain(void)
1.1       cgd       924: {
                    925:
1.268     ad        926:        KERNEL_LOCK(1, NULL);
1.284.2.2  uebayasi  927:        ip_reass_drain();
1.268     ad        928:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       929: }
                    930:
                    931: /*
                    932:  * Do option processing on a datagram,
                    933:  * possibly discarding it if bad options are encountered,
                    934:  * or forwarding it if source-routed.
                    935:  * Returns 1 if packet has been forwarded/freed,
                    936:  * 0 if the packet should be processed further.
                    937:  */
1.8       mycroft   938: int
1.211     perry     939: ip_dooptions(struct mbuf *m)
1.1       cgd       940: {
1.109     augustss  941:        struct ip *ip = mtod(m, struct ip *);
                    942:        u_char *cp, *cp0;
                    943:        struct ip_timestamp *ipt;
                    944:        struct in_ifaddr *ia;
1.1       cgd       945:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   946:        struct in_addr dst;
1.1       cgd       947:        n_time ntime;
                    948:
1.13      mycroft   949:        dst = ip->ip_dst;
1.1       cgd       950:        cp = (u_char *)(ip + 1);
                    951:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    952:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    953:                opt = cp[IPOPT_OPTVAL];
                    954:                if (opt == IPOPT_EOL)
                    955:                        break;
                    956:                if (opt == IPOPT_NOP)
                    957:                        optlen = 1;
                    958:                else {
1.113     itojun    959:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    960:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    961:                                goto bad;
                    962:                        }
1.1       cgd       963:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    964:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       965:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    966:                                goto bad;
                    967:                        }
                    968:                }
                    969:                switch (opt) {
                    970:
                    971:                default:
                    972:                        break;
                    973:
                    974:                /*
                    975:                 * Source routing with record.
                    976:                 * Find interface with current destination address.
                    977:                 * If none on this machine then drop if strictly routed,
                    978:                 * or do nothing if loosely routed.
                    979:                 * Record interface address and bring up next address
                    980:                 * component.  If strictly routed make sure next
                    981:                 * address is on directly accessible net.
                    982:                 */
                    983:                case IPOPT_LSRR:
                    984:                case IPOPT_SSRR:
1.47      cjs       985:                        if (ip_allowsrcrt == 0) {
                    986:                                type = ICMP_UNREACH;
                    987:                                code = ICMP_UNREACH_NET_PROHIB;
                    988:                                goto bad;
                    989:                        }
1.114     itojun    990:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    991:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    992:                                goto bad;
                    993:                        }
1.1       cgd       994:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    995:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    996:                                goto bad;
                    997:                        }
                    998:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   999:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1000:                        if (ia == 0) {
                   1001:                                if (opt == IPOPT_SSRR) {
                   1002:                                        type = ICMP_UNREACH;
                   1003:                                        code = ICMP_UNREACH_SRCFAIL;
                   1004:                                        goto bad;
                   1005:                                }
                   1006:                                /*
                   1007:                                 * Loose routing, and not at next destination
                   1008:                                 * yet; nothing to do except forward.
                   1009:                                 */
                   1010:                                break;
                   1011:                        }
                   1012:                        off--;                  /* 0 origin */
1.112     sommerfe 1013:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1014:                                /*
                   1015:                                 * End of source route.  Should be for us.
                   1016:                                 */
                   1017:                                save_rte(cp, ip->ip_src);
                   1018:                                break;
                   1019:                        }
                   1020:                        /*
                   1021:                         * locate outgoing interface
                   1022:                         */
1.281     tsutsui  1023:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd      1024:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1025:                        if (opt == IPOPT_SSRR)
1.196     itojun   1026:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1027:                        else
1.1       cgd      1028:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1029:                        if (ia == 0) {
                   1030:                                type = ICMP_UNREACH;
                   1031:                                code = ICMP_UNREACH_SRCFAIL;
                   1032:                                goto bad;
                   1033:                        }
                   1034:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1035:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1036:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1037:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1038:                        /*
                   1039:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1040:                         */
1.18      mycroft  1041:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1042:                        break;
                   1043:
                   1044:                case IPOPT_RR:
1.114     itojun   1045:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1046:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1047:                                goto bad;
                   1048:                        }
1.1       cgd      1049:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1050:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1051:                                goto bad;
                   1052:                        }
                   1053:                        /*
                   1054:                         * If no space remains, ignore.
                   1055:                         */
                   1056:                        off--;                  /* 0 origin */
1.112     sommerfe 1057:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1058:                                break;
1.281     tsutsui  1059:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1060:                            sizeof(ipaddr.sin_addr));
                   1061:                        /*
                   1062:                         * locate outgoing interface; if we're the destination,
                   1063:                         * use the incoming interface (should be same).
                   1064:                         */
1.96      thorpej  1065:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1066:                            == NULL &&
                   1067:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1068:                                type = ICMP_UNREACH;
                   1069:                                code = ICMP_UNREACH_HOST;
                   1070:                                goto bad;
                   1071:                        }
1.244     christos 1072:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1073:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1074:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1075:                        break;
                   1076:
                   1077:                case IPOPT_TS:
                   1078:                        code = cp - (u_char *)ip;
                   1079:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1080:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1081:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1082:                                goto bad;
1.114     itojun   1083:                        }
                   1084:                        if (ipt->ipt_ptr < 5) {
                   1085:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1086:                                goto bad;
                   1087:                        }
1.15      cgd      1088:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1089:                                if (++ipt->ipt_oflw == 0) {
                   1090:                                        code = (u_char *)&ipt->ipt_ptr -
                   1091:                                            (u_char *)ip;
1.1       cgd      1092:                                        goto bad;
1.114     itojun   1093:                                }
1.1       cgd      1094:                                break;
                   1095:                        }
1.104     thorpej  1096:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1097:                        switch (ipt->ipt_flg) {
                   1098:
                   1099:                        case IPOPT_TS_TSONLY:
                   1100:                                break;
                   1101:
                   1102:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1103:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1104:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1105:                                        code = (u_char *)&ipt->ipt_ptr -
                   1106:                                            (u_char *)ip;
1.1       cgd      1107:                                        goto bad;
1.114     itojun   1108:                                }
1.13      mycroft  1109:                                ipaddr.sin_addr = dst;
1.96      thorpej  1110:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1111:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1112:                                if (ia == 0)
                   1113:                                        continue;
1.104     thorpej  1114:                                bcopy(&ia->ia_addr.sin_addr,
                   1115:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1116:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1117:                                break;
                   1118:
                   1119:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1120:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1121:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1122:                                        code = (u_char *)&ipt->ipt_ptr -
                   1123:                                            (u_char *)ip;
1.1       cgd      1124:                                        goto bad;
1.114     itojun   1125:                                }
1.281     tsutsui  1126:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1127:                                    sizeof(struct in_addr));
1.96      thorpej  1128:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1129:                                    == NULL)
1.1       cgd      1130:                                        continue;
                   1131:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1132:                                break;
                   1133:
                   1134:                        default:
1.114     itojun   1135:                                /* XXX can't take &ipt->ipt_flg */
                   1136:                                code = (u_char *)&ipt->ipt_ptr -
                   1137:                                    (u_char *)ip + 1;
1.1       cgd      1138:                                goto bad;
                   1139:                        }
                   1140:                        ntime = iptime();
1.107     thorpej  1141:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1142:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1143:                            sizeof(n_time));
                   1144:                        ipt->ipt_ptr += sizeof(n_time);
                   1145:                }
                   1146:        }
                   1147:        if (forward) {
1.26      thorpej  1148:                if (ip_forwsrcrt == 0) {
                   1149:                        type = ICMP_UNREACH;
                   1150:                        code = ICMP_UNREACH_SRCFAIL;
                   1151:                        goto bad;
                   1152:                }
1.1       cgd      1153:                ip_forward(m, 1);
                   1154:                return (1);
1.13      mycroft  1155:        }
                   1156:        return (0);
1.1       cgd      1157: bad:
1.13      mycroft  1158:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1159:        IP_STATINC(IP_STAT_BADOPTIONS);
1.1       cgd      1160:        return (1);
                   1161: }
                   1162:
                   1163: /*
                   1164:  * Given address of next destination (final or next hop),
                   1165:  * return internet address info of interface to be used to get there.
                   1166:  */
                   1167: struct in_ifaddr *
1.211     perry    1168: ip_rtaddr(struct in_addr dst)
1.1       cgd      1169: {
1.249     dyoung   1170:        struct rtentry *rt;
                   1171:        union {
                   1172:                struct sockaddr         dst;
                   1173:                struct sockaddr_in      dst4;
                   1174:        } u;
                   1175:
                   1176:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1177:
                   1178:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
                   1179:                return NULL;
                   1180:
                   1181:        return ifatoia(rt->rt_ifa);
1.1       cgd      1182: }
                   1183:
                   1184: /*
                   1185:  * Save incoming source route for use in replies,
                   1186:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1187:  */
1.13      mycroft  1188: void
1.211     perry    1189: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1190: {
                   1191:        unsigned olen;
                   1192:
                   1193:        olen = option[IPOPT_OLEN];
                   1194: #ifdef DIAGNOSTIC
                   1195:        if (ipprintfs)
1.39      christos 1196:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1197: #endif /* 0 */
1.1       cgd      1198:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1199:                return;
1.281     tsutsui  1200:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1201:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1202:        ip_srcrt.dst = dst;
                   1203: }
                   1204:
                   1205: /*
                   1206:  * Retrieve incoming source route for use in replies,
                   1207:  * in the same form used by setsockopt.
                   1208:  * The first hop is placed before the options, will be removed later.
                   1209:  */
                   1210: struct mbuf *
1.211     perry    1211: ip_srcroute(void)
1.1       cgd      1212: {
1.109     augustss 1213:        struct in_addr *p, *q;
                   1214:        struct mbuf *m;
1.1       cgd      1215:
                   1216:        if (ip_nhops == 0)
1.237     dyoung   1217:                return NULL;
1.1       cgd      1218:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1219:        if (m == 0)
1.237     dyoung   1220:                return NULL;
1.1       cgd      1221:
1.164     matt     1222:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1223: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1224:
                   1225:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1226:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1227:            OPTSIZ;
                   1228: #ifdef DIAGNOSTIC
                   1229:        if (ipprintfs)
1.39      christos 1230:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1231: #endif
                   1232:
                   1233:        /*
                   1234:         * First save first hop for return route
                   1235:         */
                   1236:        p = &ip_srcrt.route[ip_nhops - 1];
                   1237:        *(mtod(m, struct in_addr *)) = *p--;
                   1238: #ifdef DIAGNOSTIC
                   1239:        if (ipprintfs)
1.39      christos 1240:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1241: #endif
                   1242:
                   1243:        /*
                   1244:         * Copy option fields and padding (nop) to mbuf.
                   1245:         */
                   1246:        ip_srcrt.nop = IPOPT_NOP;
                   1247:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1248:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1249:            OPTSIZ);
                   1250:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1251:            sizeof(struct in_addr) + OPTSIZ);
                   1252: #undef OPTSIZ
                   1253:        /*
                   1254:         * Record return path as an IP source route,
                   1255:         * reversing the path (pointers are now aligned).
                   1256:         */
                   1257:        while (p >= ip_srcrt.route) {
                   1258: #ifdef DIAGNOSTIC
                   1259:                if (ipprintfs)
1.39      christos 1260:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1261: #endif
                   1262:                *q++ = *p--;
                   1263:        }
                   1264:        /*
                   1265:         * Last hop goes to final destination.
                   1266:         */
                   1267:        *q = ip_srcrt.dst;
                   1268: #ifdef DIAGNOSTIC
                   1269:        if (ipprintfs)
1.39      christos 1270:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1271: #endif
                   1272:        return (m);
                   1273: }
                   1274:
1.139     matt     1275: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1276:        [PRC_MSGSIZE] = EMSGSIZE,
                   1277:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1278:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1279:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1280:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1281:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1282:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1283:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1284:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1285: };
                   1286:
                   1287: /*
                   1288:  * Forward a packet.  If some error occurs return the sender
                   1289:  * an icmp packet.  Note we can't always generate a meaningful
                   1290:  * icmp message because icmp doesn't have a large enough repertoire
                   1291:  * of codes and types.
                   1292:  *
                   1293:  * If not forwarding, just drop the packet.  This could be confusing
                   1294:  * if ipforwarding was zero but some routing protocol was advancing
                   1295:  * us as a gateway to somewhere.  However, we must let the routing
                   1296:  * protocol deal with that.
                   1297:  *
                   1298:  * The srcrt parameter indicates whether the packet is being forwarded
                   1299:  * via a source route.
                   1300:  */
1.13      mycroft  1301: void
1.211     perry    1302: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1303: {
1.109     augustss 1304:        struct ip *ip = mtod(m, struct ip *);
                   1305:        struct rtentry *rt;
1.220     christos 1306:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1307:        struct mbuf *mcopy;
1.13      mycroft  1308:        n_long dest;
1.249     dyoung   1309:        union {
                   1310:                struct sockaddr         dst;
                   1311:                struct sockaddr_in      dst4;
                   1312:        } u;
1.164     matt     1313:
                   1314:        /*
                   1315:         * We are now in the output path.
                   1316:         */
                   1317:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1318:
                   1319:        /*
                   1320:         * Clear any in-bound checksum flags for this packet.
                   1321:         */
                   1322:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1323:
1.13      mycroft  1324:        dest = 0;
1.1       cgd      1325: #ifdef DIAGNOSTIC
1.224     joerg    1326:        if (ipprintfs) {
                   1327:                printf("forward: src %s ", inet_ntoa(ip->ip_src));
                   1328:                printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
                   1329:        }
1.1       cgd      1330: #endif
1.93      sommerfe 1331:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1332:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1333:                m_freem(m);
                   1334:                return;
                   1335:        }
                   1336:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1337:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1338:                return;
                   1339:        }
                   1340:
1.249     dyoung   1341:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
                   1342:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1343:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1344:                return;
1.1       cgd      1345:        }
                   1346:
                   1347:        /*
1.34      mycroft  1348:         * Save at most 68 bytes of the packet in case
1.1       cgd      1349:         * we need to generate an ICMP message to the src.
1.119     itojun   1350:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1351:         */
1.155     itojun   1352:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1353:        if (mcopy)
                   1354:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1355:
1.221     christos 1356:        ip->ip_ttl -= IPTTLDEC;
                   1357:
1.1       cgd      1358:        /*
                   1359:         * If forwarding packet using same interface that it came in on,
                   1360:         * perhaps should send a redirect to sender to shortcut a hop.
                   1361:         * Only send redirect if source is sending directly to us,
                   1362:         * and if packet was not source routed (or has any options).
                   1363:         * Also, don't send redirect if forwarding using a default route
                   1364:         * or a route modified by a redirect.
                   1365:         */
                   1366:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1367:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1368:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1369:            ipsendredirects && !srcrt) {
1.19      mycroft  1370:                if (rt->rt_ifa &&
                   1371:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1372:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1373:                        if (rt->rt_flags & RTF_GATEWAY)
                   1374:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1375:                        else
                   1376:                                dest = ip->ip_dst.s_addr;
                   1377:                        /*
                   1378:                         * Router requirements says to only send host
                   1379:                         * redirects.
                   1380:                         */
                   1381:                        type = ICMP_REDIRECT;
                   1382:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1383: #ifdef DIAGNOSTIC
1.77      thorpej  1384:                        if (ipprintfs)
                   1385:                                printf("redirect (%d) to %x\n", code,
                   1386:                                    (u_int32_t)dest);
1.1       cgd      1387: #endif
                   1388:                }
                   1389:        }
                   1390:
1.238     dyoung   1391:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1392:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1393:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1394:
1.1       cgd      1395:        if (error)
1.266     thorpej  1396:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1397:        else {
1.266     thorpej  1398:                uint64_t *ips = IP_STAT_GETREF();
                   1399:                ips[IP_STAT_FORWARD]++;
                   1400:                if (type) {
                   1401:                        ips[IP_STAT_REDIRECTSENT]++;
                   1402:                        IP_STAT_PUTREF();
                   1403:                } else {
                   1404:                        IP_STAT_PUTREF();
1.63      matt     1405:                        if (mcopy) {
                   1406: #ifdef GATEWAY
1.64      thorpej  1407:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1408:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1409: #endif
1.1       cgd      1410:                                m_freem(mcopy);
1.63      matt     1411:                        }
1.1       cgd      1412:                        return;
                   1413:                }
                   1414:        }
                   1415:        if (mcopy == NULL)
                   1416:                return;
1.13      mycroft  1417:
1.1       cgd      1418:        switch (error) {
                   1419:
                   1420:        case 0:                         /* forwarded, but need redirect */
                   1421:                /* type, code set above */
                   1422:                break;
                   1423:
                   1424:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1425:        case EHOSTUNREACH:
                   1426:        case ENETDOWN:
                   1427:        case EHOSTDOWN:
                   1428:        default:
                   1429:                type = ICMP_UNREACH;
                   1430:                code = ICMP_UNREACH_HOST;
                   1431:                break;
                   1432:
                   1433:        case EMSGSIZE:
                   1434:                type = ICMP_UNREACH;
                   1435:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1436:
1.274     seanb    1437:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
                   1438:                        destmtu = rt->rt_ifp->if_mtu;
1.263     cube     1439:
                   1440: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274     seanb    1441:                {
1.263     cube     1442:                        /*
                   1443:                         * If the packet is routed over IPsec tunnel, tell the
                   1444:                         * originator the tunnel MTU.
                   1445:                         *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1446:                         * XXX quickhack!!!
                   1447:                         */
                   1448:
1.89      itojun   1449:                        struct secpolicy *sp;
                   1450:                        int ipsecerror;
1.95      itojun   1451:                        size_t ipsechdr;
1.89      itojun   1452:                        struct route *ro;
                   1453:
                   1454:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1455:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1456:                            &ipsecerror);
1.89      itojun   1457:
1.263     cube     1458:                        if (sp != NULL) {
1.89      itojun   1459:                                /* count IPsec header size */
1.95      itojun   1460:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1461:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1462:
                   1463:                                /*
                   1464:                                 * find the correct route for outer IPv4
                   1465:                                 * header, compute tunnel MTU.
                   1466:                                 */
1.220     christos 1467:
1.89      itojun   1468:                                if (sp->req != NULL
1.95      itojun   1469:                                 && sp->req->sav != NULL
                   1470:                                 && sp->req->sav->sah != NULL) {
                   1471:                                        ro = &sp->req->sav->sah->sa_route;
1.274     seanb    1472:                                        rt = rtcache_validate(ro);
1.257     dyoung   1473:                                        if (rt && rt->rt_ifp) {
1.220     christos 1474:                                                destmtu =
1.257     dyoung   1475:                                                    rt->rt_rmx.rmx_mtu ?
                   1476:                                                    rt->rt_rmx.rmx_mtu :
                   1477:                                                    rt->rt_ifp->if_mtu;
1.220     christos 1478:                                                destmtu -= ipsechdr;
1.89      itojun   1479:                                        }
                   1480:                                }
                   1481:
1.173     jonathan 1482: #ifdef IPSEC
1.89      itojun   1483:                                key_freesp(sp);
1.173     jonathan 1484: #else
                   1485:                                KEY_FREESP(&sp);
                   1486: #endif
1.89      itojun   1487:                        }
1.274     seanb    1488:                }
1.263     cube     1489: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266     thorpej  1490:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1491:                break;
                   1492:
                   1493:        case ENOBUFS:
1.143     itojun   1494: #if 1
                   1495:                /*
                   1496:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1497:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1498:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1499:                 * or if the underlying interface is rate-limited.
1.143     itojun   1500:                 */
                   1501:                if (mcopy)
                   1502:                        m_freem(mcopy);
                   1503:                return;
                   1504: #else
1.1       cgd      1505:                type = ICMP_SOURCEQUENCH;
                   1506:                code = 0;
                   1507:                break;
1.143     itojun   1508: #endif
1.1       cgd      1509:        }
1.220     christos 1510:        icmp_error(mcopy, type, code, dest, destmtu);
1.44      thorpej  1511: }
                   1512:
                   1513: void
1.211     perry    1514: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1515:     struct mbuf *m)
1.44      thorpej  1516: {
                   1517:
1.283     minskim  1518:        if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278     christos 1519: #ifdef SO_OTIMESTAMP
1.283     minskim  1520:            || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278     christos 1521: #endif
                   1522:            ) {
1.44      thorpej  1523:                struct timeval tv;
                   1524:
                   1525:                microtime(&tv);
1.278     christos 1526: #ifdef SO_OTIMESTAMP
                   1527:                if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
                   1528:                        struct timeval50 tv50;
                   1529:                        timeval_to_timeval50(&tv, &tv50);
                   1530:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1531:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1532:                } else
                   1533: #endif
1.244     christos 1534:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1535:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1536:                if (*mp)
                   1537:                        mp = &(*mp)->m_next;
                   1538:        }
                   1539:        if (inp->inp_flags & INP_RECVDSTADDR) {
1.244     christos 1540:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1541:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1542:                if (*mp)
                   1543:                        mp = &(*mp)->m_next;
                   1544:        }
                   1545: #ifdef notyet
                   1546:        /*
                   1547:         * XXX
                   1548:         * Moving these out of udp_input() made them even more broken
                   1549:         * than they already were.
                   1550:         *      - fenner@parc.xerox.com
                   1551:         */
                   1552:        /* options were tossed already */
                   1553:        if (inp->inp_flags & INP_RECVOPTS) {
1.244     christos 1554:                *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44      thorpej  1555:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1556:                if (*mp)
                   1557:                        mp = &(*mp)->m_next;
                   1558:        }
                   1559:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1560:        if (inp->inp_flags & INP_RECVRETOPTS) {
1.244     christos 1561:                *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44      thorpej  1562:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1563:                if (*mp)
                   1564:                        mp = &(*mp)->m_next;
                   1565:        }
                   1566: #endif
                   1567:        if (inp->inp_flags & INP_RECVIF) {
                   1568:                struct sockaddr_dl sdl;
                   1569:
1.252     dyoung   1570:                sockaddr_dl_init(&sdl, sizeof(sdl),
                   1571:                    (m->m_pkthdr.rcvif != NULL)
                   1572:                        ?  m->m_pkthdr.rcvif->if_index
                   1573:                        : 0,
                   1574:                        0, NULL, 0, NULL, 0);
1.251     dyoung   1575:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1576:                if (*mp)
                   1577:                        mp = &(*mp)->m_next;
                   1578:        }
1.282     minskim  1579:        if (inp->inp_flags & INP_RECVTTL) {
                   1580:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1581:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1582:                if (*mp)
                   1583:                        mp = &(*mp)->m_next;
                   1584:        }
1.13      mycroft  1585: }
                   1586:
1.189     atatat   1587: /*
1.228     elad     1588:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1589:  */
                   1590: static int
                   1591: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1592: {
                   1593:        int error, tmp;
                   1594:        struct sysctlnode node;
                   1595:
                   1596:        node = *rnode;
                   1597:        tmp = ip_forwsrcrt;
                   1598:        node.sysctl_data = &tmp;
                   1599:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1600:        if (error || newp == NULL)
                   1601:                return (error);
                   1602:
1.280     elad     1603:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1604:            0, NULL, NULL, NULL);
                   1605:        if (error)
                   1606:                return (error);
1.228     elad     1607:
                   1608:        ip_forwsrcrt = tmp;
                   1609:
                   1610:        return (0);
                   1611: }
                   1612:
                   1613: /*
1.189     atatat   1614:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1615:  * range of the new value and tweaks timers if it changes.
                   1616:  */
                   1617: static int
                   1618: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1619: {
1.189     atatat   1620:        int error, tmp;
                   1621:        struct sysctlnode node;
                   1622:
                   1623:        node = *rnode;
                   1624:        tmp = ip_mtudisc_timeout;
                   1625:        node.sysctl_data = &tmp;
                   1626:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1627:        if (error || newp == NULL)
                   1628:                return (error);
                   1629:        if (tmp < 0)
                   1630:                return (EINVAL);
1.52      thorpej  1631:
1.273     matt     1632:        mutex_enter(softnet_lock);
                   1633:
1.189     atatat   1634:        ip_mtudisc_timeout = tmp;
                   1635:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1636:
1.273     matt     1637:        mutex_exit(softnet_lock);
                   1638:
1.189     atatat   1639:        return (0);
                   1640: }
1.54      lukem    1641:
1.65      matt     1642: #ifdef GATEWAY
1.189     atatat   1643: /*
1.247     liamjfoy 1644:  * sysctl helper routine for net.inet.ip.maxflows.
1.189     atatat   1645:  */
                   1646: static int
                   1647: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   1648: {
1.273     matt     1649:        int error;
1.67      thorpej  1650:
1.273     matt     1651:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1652:        if (error || newp == NULL)
                   1653:                return (error);
                   1654:
                   1655:        mutex_enter(softnet_lock);
                   1656:        KERNEL_LOCK(1, NULL);
1.212     perry    1657:
1.265     thorpej  1658:        ipflow_prune();
1.273     matt     1659:
                   1660:        KERNEL_UNLOCK_ONE(NULL);
                   1661:        mutex_exit(softnet_lock);
1.144     martin   1662:
1.189     atatat   1663:        return (0);
                   1664: }
1.248     liamjfoy 1665:
                   1666: static int
                   1667: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283     minskim  1668: {
1.248     liamjfoy 1669:        int error, tmp;
                   1670:        struct sysctlnode node;
                   1671:
                   1672:        node = *rnode;
                   1673:        tmp = ip_hashsize;
                   1674:        node.sysctl_data = &tmp;
                   1675:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1676:        if (error || newp == NULL)
                   1677:                return (error);
                   1678:
                   1679:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1680:                /*
                   1681:                 * Can only fail due to malloc()
                   1682:                 */
1.273     matt     1683:                mutex_enter(softnet_lock);
                   1684:                KERNEL_LOCK(1, NULL);
                   1685:
                   1686:                error = ipflow_invalidate_all(tmp);
                   1687:
                   1688:                KERNEL_UNLOCK_ONE(NULL);
                   1689:                mutex_exit(softnet_lock);
                   1690:
1.248     liamjfoy 1691:        } else {
                   1692:                /*
                   1693:                 * EINVAL if not a power of 2
                   1694:                 */
1.273     matt     1695:                error = EINVAL;
1.283     minskim  1696:        }
1.248     liamjfoy 1697:
1.273     matt     1698:        return error;
1.248     liamjfoy 1699: }
1.189     atatat   1700: #endif /* GATEWAY */
1.117     tron     1701:
1.266     thorpej  1702: static int
                   1703: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1704: {
                   1705:
1.271     thorpej  1706:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1707: }
1.131     itojun   1708:
1.284     pooka    1709: static void
                   1710: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1711: {
                   1712:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 1713:
1.197     atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT,
1.189     atatat   1716:                       CTLTYPE_NODE, "net", NULL,
                   1717:                       NULL, 0, NULL, 0,
                   1718:                       CTL_NET, CTL_EOL);
1.197     atatat   1719:        sysctl_createv(clog, 0, NULL, NULL,
                   1720:                       CTLFLAG_PERMANENT,
1.203     atatat   1721:                       CTLTYPE_NODE, "inet",
                   1722:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1723:                       NULL, 0, NULL, 0,
                   1724:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1725:        sysctl_createv(clog, 0, NULL, NULL,
                   1726:                       CTLFLAG_PERMANENT,
1.203     atatat   1727:                       CTLTYPE_NODE, "ip",
                   1728:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1729:                       NULL, 0, NULL, 0,
                   1730:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1731:
1.197     atatat   1732:        sysctl_createv(clog, 0, NULL, NULL,
                   1733:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1734:                       CTLTYPE_INT, "forwarding",
                   1735:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1736:                       NULL, 0, &ipforwarding, 0,
                   1737:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1738:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1739:        sysctl_createv(clog, 0, NULL, NULL,
                   1740:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1741:                       CTLTYPE_INT, "redirect",
                   1742:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1743:                       NULL, 0, &ipsendredirects, 0,
                   1744:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1745:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1746:        sysctl_createv(clog, 0, NULL, NULL,
                   1747:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1748:                       CTLTYPE_INT, "ttl",
                   1749:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1750:                       NULL, 0, &ip_defttl, 0,
                   1751:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1752:                       IPCTL_DEFTTL, CTL_EOL);
                   1753: #ifdef IPCTL_DEFMTU
1.197     atatat   1754:        sysctl_createv(clog, 0, NULL, NULL,
                   1755:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1756:                       CTLTYPE_INT, "mtu",
                   1757:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1758:                       NULL, 0, &ip_mtu, 0,
                   1759:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1760:                       IPCTL_DEFMTU, CTL_EOL);
                   1761: #endif /* IPCTL_DEFMTU */
1.197     atatat   1762:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1763:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1764:                       CTLTYPE_INT, "forwsrcrt",
                   1765:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1766:                                    "datagrams"),
1.228     elad     1767:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1768:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1769:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1770:        sysctl_createv(clog, 0, NULL, NULL,
                   1771:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1772:                       CTLTYPE_INT, "directed-broadcast",
                   1773:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1774:                       NULL, 0, &ip_directedbcast, 0,
                   1775:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1776:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1777:        sysctl_createv(clog, 0, NULL, NULL,
                   1778:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1779:                       CTLTYPE_INT, "allowsrcrt",
                   1780:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1781:                       NULL, 0, &ip_allowsrcrt, 0,
                   1782:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1783:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   1784:        sysctl_createv(clog, 0, NULL, NULL,
                   1785:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1786:                       CTLTYPE_INT, "subnetsarelocal",
                   1787:                       SYSCTL_DESCR("Whether logical subnets are considered "
                   1788:                                    "local"),
1.189     atatat   1789:                       NULL, 0, &subnetsarelocal, 0,
                   1790:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1791:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1794:                       CTLTYPE_INT, "mtudisc",
                   1795:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1796:                       NULL, 0, &ip_mtudisc, 0,
                   1797:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1798:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1799:        sysctl_createv(clog, 0, NULL, NULL,
                   1800:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1801:                       CTLTYPE_INT, "anonportmin",
                   1802:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1803:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1804:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1805:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1806:        sysctl_createv(clog, 0, NULL, NULL,
                   1807:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1808:                       CTLTYPE_INT, "anonportmax",
                   1809:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1810:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1811:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1812:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1813:        sysctl_createv(clog, 0, NULL, NULL,
                   1814:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1815:                       CTLTYPE_INT, "mtudisctimeout",
                   1816:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   1817:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   1818:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1819:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1820: #ifdef GATEWAY
1.197     atatat   1821:        sysctl_createv(clog, 0, NULL, NULL,
                   1822:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1823:                       CTLTYPE_INT, "maxflows",
                   1824:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   1825:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   1826:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1827:                       IPCTL_MAXFLOWS, CTL_EOL);
1.248     liamjfoy 1828:        sysctl_createv(clog, 0, NULL, NULL,
                   1829:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1830:                        CTLTYPE_INT, "hashsize",
                   1831:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
                   1832:                        sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
                   1833:                        CTL_NET, PF_INET, IPPROTO_IP,
                   1834:                        CTL_CREATE, CTL_EOL);
1.189     atatat   1835: #endif /* GATEWAY */
1.197     atatat   1836:        sysctl_createv(clog, 0, NULL, NULL,
                   1837:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1838:                       CTLTYPE_INT, "hostzerobroadcast",
                   1839:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   1840:                       NULL, 0, &hostzeroisbroadcast, 0,
                   1841:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1842:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   1843: #if NGIF > 0
1.197     atatat   1844:        sysctl_createv(clog, 0, NULL, NULL,
                   1845:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1846:                       CTLTYPE_INT, "gifttl",
                   1847:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   1848:                       NULL, 0, &ip_gif_ttl, 0,
                   1849:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1850:                       IPCTL_GIF_TTL, CTL_EOL);
                   1851: #endif /* NGIF */
                   1852: #ifndef IPNOPRIVPORTS
1.197     atatat   1853:        sysctl_createv(clog, 0, NULL, NULL,
                   1854:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1855:                       CTLTYPE_INT, "lowportmin",
                   1856:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1857:                                    "to assign"),
1.189     atatat   1858:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1859:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1860:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1861:        sysctl_createv(clog, 0, NULL, NULL,
                   1862:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1863:                       CTLTYPE_INT, "lowportmax",
                   1864:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1865:                                    "to assign"),
1.189     atatat   1866:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1867:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1868:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1869: #endif /* IPNOPRIVPORTS */
                   1870: #if NGRE > 0
1.197     atatat   1871:        sysctl_createv(clog, 0, NULL, NULL,
                   1872:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1873:                       CTLTYPE_INT, "grettl",
                   1874:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1875:                       NULL, 0, &ip_gre_ttl, 0,
                   1876:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1877:                       IPCTL_GRE_TTL, CTL_EOL);
                   1878: #endif /* NGRE */
1.197     atatat   1879:        sysctl_createv(clog, 0, NULL, NULL,
                   1880:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1881:                       CTLTYPE_INT, "checkinterface",
                   1882:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1883:                                    "from RFC1122"),
1.189     atatat   1884:                       NULL, 0, &ip_checkinterface, 0,
                   1885:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1886:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1887:        sysctl_createv(clog, 0, NULL, NULL,
                   1888:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1889:                       CTLTYPE_INT, "random_id",
                   1890:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1891:                       NULL, 0, &ip_do_randomid, 0,
                   1892:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1893:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1894:        sysctl_createv(clog, 0, NULL, NULL,
                   1895:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1896:                       CTLTYPE_INT, "do_loopback_cksum",
                   1897:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1898:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1899:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1900:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1901:        sysctl_createv(clog, 0, NULL, NULL,
                   1902:                       CTLFLAG_PERMANENT,
                   1903:                       CTLTYPE_STRUCT, "stats",
                   1904:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1905:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1906:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1907:                       CTL_EOL);
1.1       cgd      1908: }
1.266     thorpej  1909:
                   1910: void
                   1911: ip_statinc(u_int stat)
                   1912: {
                   1913:
                   1914:        KASSERT(stat < IP_NSTATS);
                   1915:        IP_STATINC(stat);
                   1916: }

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