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Annotation of src/sys/netinet/ip_input.c, Revision 1.292

1.292   ! matt        1: /*     $NetBSD: ip_input.c,v 1.291 2010/11/05 01:35:57 rmind 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>
1.292   ! matt       94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.291 2010/11/05 01:35:57 rmind 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;
1.286     tls       233:
1.291     rmind     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:
1.288     rmind     317:        ip_reass_init();
1.190     jonathan  318:
1.291     rmind     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;
1.286     tls       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);
1.286     tls       373:        if (!IF_IS_EMPTY(&ipintrq)) {
1.132     thorpej   374:                s = splnet();
1.286     tls       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);
1.286     tls       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;
1.292   ! matt      393:                KERNEL_UNLOCK_ONE(NULL);
1.89      itojun    394:                ip_input(m);
1.292   ! matt      395:                KERNEL_LOCK(1, NULL);
1.89      itojun    396:        }
1.268     ad        397:        mutex_exit(softnet_lock);
1.89      itojun    398: }
                    399:
                    400: /*
1.1       cgd       401:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    402:  * try to reassemble.  Process options.  Pass to next level.
                    403:  */
1.8       mycroft   404: void
1.89      itojun    405: ip_input(struct mbuf *m)
1.1       cgd       406: {
1.109     augustss  407:        struct ip *ip = NULL;
                    408:        struct in_ifaddr *ia;
                    409:        struct ifaddr *ifa;
1.288     rmind     410:        int hlen = 0, len;
1.100     itojun    411:        int downmatch;
1.165     christos  412:        int checkif;
1.169     itojun    413:        int srcrt = 0;
1.173     jonathan  414: #ifdef FAST_IPSEC
                    415:        struct m_tag *mtag;
                    416:        struct tdb_ident *tdbi;
                    417:        struct secpolicy *sp;
1.289     rmind     418:        int error, s;
1.173     jonathan  419: #endif /* FAST_IPSEC */
1.1       cgd       420:
1.164     matt      421:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     422:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164     matt      423:
1.1       cgd       424:        /*
                    425:         * If no IP addresses have been set yet but the interfaces
                    426:         * are receiving, can't do anything with incoming packets yet.
                    427:         */
1.181     jonathan  428:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       429:                goto bad;
1.266     thorpej   430:        IP_STATINC(IP_STAT_TOTAL);
1.154     thorpej   431:        /*
                    432:         * If the IP header is not aligned, slurp it up into a new
                    433:         * mbuf with space for link headers, in the event we forward
                    434:         * it.  Otherwise, if it is aligned, make sure the entire
                    435:         * base IP header is in the first mbuf of the chain.
                    436:         */
1.244     christos  437:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   438:                if ((m = m_copyup(m, sizeof(struct ip),
                    439:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    440:                        /* XXXJRT new stat, please */
1.266     thorpej   441:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   442:                        return;
                    443:                }
                    444:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    445:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   446:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   447:                        return;
                    448:                }
1.1       cgd       449:        }
                    450:        ip = mtod(m, struct ip *);
1.13      mycroft   451:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   452:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   453:                goto bad;
                    454:        }
1.1       cgd       455:        hlen = ip->ip_hl << 2;
                    456:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   457:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       458:                goto bad;
                    459:        }
                    460:        if (hlen > m->m_len) {
                    461:                if ((m = m_pullup(m, hlen)) == 0) {
1.266     thorpej   462:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    463:                        return;
1.1       cgd       464:                }
                    465:                ip = mtod(m, struct ip *);
                    466:        }
1.98      thorpej   467:
1.85      hwr       468:        /*
1.99      thorpej   469:         * RFC1122: packets with a multicast source address are
1.98      thorpej   470:         * not allowed.
1.85      hwr       471:         */
                    472:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   473:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       474:                goto bad;
1.129     itojun    475:        }
                    476:
                    477:        /* 127/8 must not appear on wire - RFC1122 */
                    478:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    479:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    480:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   481:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    482:                        goto bad;
1.130     itojun    483:                }
1.85      hwr       484:        }
                    485:
1.135     thorpej   486:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   487:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   488:                 M_CSUM_IPv4_BAD)) {
                    489:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    490:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    491:                goto badcsum;
                    492:
                    493:        case M_CSUM_IPv4:
                    494:                /* Checksum was okay. */
                    495:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    496:                break;
                    497:
                    498:        default:
1.206     thorpej   499:                /*
                    500:                 * Must compute it ourselves.  Maybe skip checksum on
                    501:                 * loopback interfaces.
                    502:                 */
                    503:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    504:                                     IFF_LOOPBACK) || ip_do_loopback_cksum)) {
                    505:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    506:                        if (in_cksum(m, hlen) != 0)
                    507:                                goto badcsum;
                    508:                }
1.135     thorpej   509:                break;
1.1       cgd       510:        }
                    511:
1.121     thorpej   512:        /* Retrieve the packet length. */
                    513:        len = ntohs(ip->ip_len);
1.81      proff     514:
                    515:        /*
                    516:         * Check for additional length bogosity
                    517:         */
1.84      proff     518:        if (len < hlen) {
1.266     thorpej   519:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     520:                goto bad;
                    521:        }
1.1       cgd       522:
                    523:        /*
                    524:         * Check that the amount of data in the buffers
                    525:         * is as at least much as the IP header would have us expect.
                    526:         * Trim mbufs if longer than we expect.
                    527:         * Drop packet if shorter than we expect.
                    528:         */
1.35      mycroft   529:        if (m->m_pkthdr.len < len) {
1.266     thorpej   530:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       531:                goto bad;
                    532:        }
1.35      mycroft   533:        if (m->m_pkthdr.len > len) {
1.1       cgd       534:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   535:                        m->m_len = len;
                    536:                        m->m_pkthdr.len = len;
1.1       cgd       537:                } else
1.35      mycroft   538:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       539:        }
                    540:
1.193     scw       541: #if defined(IPSEC)
1.149     wiz       542:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    543:        m->m_flags &= ~M_CANFASTFWD;
                    544: #else
1.64      thorpej   545:        /*
                    546:         * Assume that we can create a fast-forward IP flow entry
                    547:         * based on this packet.
                    548:         */
                    549:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    550: #endif
1.64      thorpej   551:
1.36      mrg       552: #ifdef PFIL_HOOKS
1.33      mrg       553:        /*
1.64      thorpej   554:         * Run through list of hooks for input packets.  If there are any
                    555:         * filters which require that additional packets in the flow are
                    556:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    557:         * Note that filters must _never_ set this flag, as another filter
                    558:         * in the list may have previously cleared it.
1.33      mrg       559:         */
1.127     itojun    560:        /*
                    561:         * let ipfilter look at packet on the wire,
                    562:         * not the decapsulated packet.
                    563:         */
                    564: #ifdef IPSEC
1.136     itojun    565:        if (!ipsec_getnhist(m))
1.186     scw       566: #elif defined(FAST_IPSEC)
                    567:        if (!ipsec_indone(m))
1.127     itojun    568: #else
                    569:        if (1)
                    570: #endif
                    571:        {
1.169     itojun    572:                struct in_addr odst;
                    573:
                    574:                odst = ip->ip_dst;
1.127     itojun    575:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    576:                    PFIL_IN) != 0)
                    577:                        return;
1.127     itojun    578:                if (m == NULL)
                    579:                        return;
                    580:                ip = mtod(m, struct ip *);
1.142     darrenr   581:                hlen = ip->ip_hl << 2;
1.205     darrenr   582:                /*
                    583:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    584:                 * from generating ICMP redirects for packets that have
                    585:                 * been redirected by a hook back out on to the same LAN that
                    586:                 * they came from and is not an indication that the packet
                    587:                 * is being inffluenced by source routing options.  This
                    588:                 * allows things like
                    589:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    590:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    591:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    592:                 * also requires a "map tlp0 ..." to complete the story.
                    593:                 * One might argue whether or not this kind of network config.
1.212     perry     594:                 * should be supported in this manner...
1.205     darrenr   595:                 */
1.169     itojun    596:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    597:        }
1.36      mrg       598: #endif /* PFIL_HOOKS */
1.123     thorpej   599:
                    600: #ifdef ALTQ
                    601:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    602:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    603:                /* packet dropped by traffic conditioner */
                    604:                return;
                    605:        }
                    606: #endif
1.121     thorpej   607:
                    608:        /*
1.1       cgd       609:         * Process options and, if not destined for us,
                    610:         * ship it on.  ip_dooptions returns 1 when an
                    611:         * error was detected (causing an icmp message
                    612:         * to be sent and the original packet to be freed).
                    613:         */
                    614:        ip_nhops = 0;           /* for source routed packets */
                    615:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    616:                return;
1.1       cgd       617:
                    618:        /*
1.165     christos  619:         * Enable a consistency check between the destination address
                    620:         * and the arrival interface for a unicast packet (the RFC 1122
                    621:         * strong ES model) if IP forwarding is disabled and the packet
                    622:         * is not locally generated.
                    623:         *
                    624:         * XXX - Checking also should be disabled if the destination
                    625:         * address is ipnat'ed to a different interface.
                    626:         *
                    627:         * XXX - Checking is incompatible with IP aliases added
                    628:         * to the loopback interface instead of the interface where
                    629:         * the packets are received.
                    630:         *
                    631:         * XXX - We need to add a per ifaddr flag for this so that
                    632:         * we get finer grain control.
                    633:         */
                    634:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    635:            (m->m_pkthdr.rcvif != NULL) &&
                    636:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    637:
                    638:        /*
1.1       cgd       639:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    640:         *
                    641:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    642:         * The behavior here is to treat addresses on !IFF_UP interface
                    643:         * as not mine.
1.1       cgd       644:         */
1.100     itojun    645:        downmatch = 0;
1.140     matt      646:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    647:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  648:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    649:                                continue;
1.97      itojun    650:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    651:                                break;
1.100     itojun    652:                        else
                    653:                                downmatch++;
1.97      itojun    654:                }
                    655:        }
1.86      thorpej   656:        if (ia != NULL)
                    657:                goto ours;
1.225     christos  658:        if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209     matt      659:                IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140     matt      660:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    661:                                continue;
1.57      tls       662:                        ia = ifatoia(ifa);
1.35      mycroft   663:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    664:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   665:                            /*
                    666:                             * Look for all-0's host part (old broadcast addr),
                    667:                             * either for subnet or net.
                    668:                             */
                    669:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   670:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       671:                                goto ours;
1.57      tls       672:                        /*
                    673:                         * An interface with IP address zero accepts
                    674:                         * all packets that arrive on that interface.
                    675:                         */
                    676:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    677:                                goto ours;
1.1       cgd       678:                }
                    679:        }
1.18      mycroft   680:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   681:                struct in_multi *inm;
                    682: #ifdef MROUTING
                    683:                extern struct socket *ip_mrouter;
1.10      brezak    684:
1.4       hpeyerl   685:                if (ip_mrouter) {
                    686:                        /*
                    687:                         * If we are acting as a multicast router, all
                    688:                         * incoming multicast packets are passed to the
                    689:                         * kernel-level multicast forwarding function.
                    690:                         * The packet is returned (relatively) intact; if
                    691:                         * ip_mforward() returns a non-zero value, the packet
                    692:                         * must be discarded, else it may be accepted below.
                    693:                         *
                    694:                         * (The IP ident field is put in the same byte order
                    695:                         * as expected when ip_mforward() is called from
                    696:                         * ip_output().)
                    697:                         */
1.13      mycroft   698:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266     thorpej   699:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   700:                                m_freem(m);
1.89      itojun    701:                                return;
1.4       hpeyerl   702:                        }
                    703:
                    704:                        /*
                    705:                         * The process-level routing demon needs to receive
                    706:                         * all multicast IGMP packets, whether or not this
                    707:                         * host belongs to their destination groups.
                    708:                         */
                    709:                        if (ip->ip_p == IPPROTO_IGMP)
                    710:                                goto ours;
1.266     thorpej   711:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   712:                }
                    713: #endif
                    714:                /*
                    715:                 * See if we belong to the destination multicast group on the
                    716:                 * arrival interface.
                    717:                 */
                    718:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    719:                if (inm == NULL) {
1.266     thorpej   720:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   721:                        m_freem(m);
1.89      itojun    722:                        return;
1.4       hpeyerl   723:                }
                    724:                goto ours;
                    725:        }
1.19      mycroft   726:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   727:            in_nullhost(ip->ip_dst))
1.1       cgd       728:                goto ours;
                    729:
                    730:        /*
                    731:         * Not for us; forward if possible and desirable.
                    732:         */
                    733:        if (ipforwarding == 0) {
1.266     thorpej   734:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       735:                m_freem(m);
1.100     itojun    736:        } else {
                    737:                /*
                    738:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    739:                 * and there's no IFF_UP interface that matches ip_dst,
                    740:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    741:                 * forwarding loop till TTL goes to 0.
                    742:                 */
                    743:                if (downmatch) {
                    744:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   745:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    746:                        return;
                    747:                }
1.145     itojun    748: #ifdef IPSEC
                    749:                if (ipsec4_in_reject(m, NULL)) {
1.267     thorpej   750:                        IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145     itojun    751:                        goto bad;
                    752:                }
                    753: #endif
1.173     jonathan  754: #ifdef FAST_IPSEC
                    755:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    756:                s = splsoftnet();
                    757:                if (mtag != NULL) {
                    758:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    759:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    760:                } else {
                    761:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     762:                                                   IP_FORWARDING, &error);
1.173     jonathan  763:                }
                    764:                if (sp == NULL) {       /* NB: can happen if error */
                    765:                        splx(s);
                    766:                        /*XXX error stat???*/
                    767:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    768:                        goto bad;
                    769:                }
                    770:
                    771:                /*
                    772:                 * Check security policy against packet attributes.
                    773:                 */
                    774:                error = ipsec_in_reject(sp, m);
                    775:                KEY_FREESP(&sp);
                    776:                splx(s);
                    777:                if (error) {
1.266     thorpej   778:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.173     jonathan  779:                        goto bad;
1.193     scw       780:                }
                    781:
                    782:                /*
                    783:                 * Peek at the outbound SP for this packet to determine if
                    784:                 * it's a Fast Forward candidate.
                    785:                 */
                    786:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    787:                if (mtag != NULL)
                    788:                        m->m_flags &= ~M_CANFASTFWD;
                    789:                else {
                    790:                        s = splsoftnet();
                    791:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    792:                            (IP_FORWARDING |
                    793:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    794:                            &error, NULL);
                    795:                        if (sp != NULL) {
                    796:                                m->m_flags &= ~M_CANFASTFWD;
                    797:                                KEY_FREESP(&sp);
                    798:                        }
                    799:                        splx(s);
1.173     jonathan  800:                }
                    801: #endif /* FAST_IPSEC */
1.145     itojun    802:
1.169     itojun    803:                ip_forward(m, srcrt);
1.100     itojun    804:        }
1.89      itojun    805:        return;
1.1       cgd       806:
                    807: ours:
                    808:        /*
                    809:         * If offset or IP_MF are set, must reassemble.
                    810:         */
1.155     itojun    811:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     812:                /*
                    813:                 * Pass to IP reassembly mechanism.
                    814:                 */
1.290     rmind     815:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     816:                        /* Failed; invalid fragment(s) or packet. */
1.288     rmind     817:                        goto bad;
1.16      cgd       818:                }
1.290     rmind     819:                if (m == NULL) {
1.289     rmind     820:                        /* More fragments should come; silently return. */
                    821:                        return;
                    822:                }
1.290     rmind     823:                /*
                    824:                 * Reassembly is done, we have the final packet.
                    825:                 * Updated cached data in local variable(s).
                    826:                 */
1.289     rmind     827:                ip = mtod(m, struct ip *);
                    828:                hlen = ip->ip_hl << 2;
1.79      mycroft   829:        }
1.128     itojun    830:
1.173     jonathan  831: #if defined(IPSEC)
1.128     itojun    832:        /*
                    833:         * enforce IPsec policy checking if we are seeing last header.
                    834:         * note that we do not visit this with protocols with pcb layer
                    835:         * code - like udp/tcp/raw ip.
                    836:         */
                    837:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    838:            ipsec4_in_reject(m, NULL)) {
1.267     thorpej   839:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128     itojun    840:                goto bad;
                    841:        }
                    842: #endif
1.226     liamjfoy  843: #ifdef FAST_IPSEC
1.173     jonathan  844:        /*
                    845:         * enforce IPsec policy checking if we are seeing last header.
                    846:         * note that we do not visit this with protocols with pcb layer
                    847:         * code - like udp/tcp/raw ip.
                    848:         */
                    849:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    850:                /*
                    851:                 * Check if the packet has already had IPsec processing
                    852:                 * done.  If so, then just pass it along.  This tag gets
                    853:                 * set during AH, ESP, etc. input handling, before the
                    854:                 * packet is returned to the ip input queue for delivery.
1.212     perry     855:                 */
1.173     jonathan  856:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    857:                s = splsoftnet();
                    858:                if (mtag != NULL) {
                    859:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    860:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    861:                } else {
                    862:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     863:                                                   IP_FORWARDING, &error);
1.173     jonathan  864:                }
                    865:                if (sp != NULL) {
                    866:                        /*
                    867:                         * Check security policy against packet attributes.
                    868:                         */
                    869:                        error = ipsec_in_reject(sp, m);
                    870:                        KEY_FREESP(&sp);
                    871:                } else {
                    872:                        /* XXX error stat??? */
                    873:                        error = EINVAL;
                    874: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    875:                }
                    876:                splx(s);
                    877:                if (error)
                    878:                        goto bad;
                    879:        }
                    880: #endif /* FAST_IPSEC */
1.1       cgd       881:
                    882:        /*
                    883:         * Switch out to protocol's input routine.
                    884:         */
1.82      aidan     885: #if IFA_STATS
1.122     itojun    886:        if (ia && ip)
1.155     itojun    887:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     888: #endif
1.266     thorpej   889:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    890:     {
                    891:        int off = hlen, nh = ip->ip_p;
                    892:
                    893:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    894:        return;
                    895:     }
1.1       cgd       896: bad:
                    897:        m_freem(m);
1.135     thorpej   898:        return;
                    899:
                    900: badcsum:
1.266     thorpej   901:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej   902:        m_freem(m);
1.1       cgd       903: }
                    904:
                    905: /*
1.288     rmind     906:  * IP timer processing.
1.1       cgd       907:  */
1.8       mycroft   908: void
1.211     perry     909: ip_slowtimo(void)
1.1       cgd       910: {
1.268     ad        911:
                    912:        mutex_enter(softnet_lock);
                    913:        KERNEL_LOCK(1, NULL);
1.1       cgd       914:
1.288     rmind     915:        ip_reass_slowtimo();
1.268     ad        916:
                    917:        KERNEL_UNLOCK_ONE(NULL);
                    918:        mutex_exit(softnet_lock);
1.1       cgd       919: }
                    920:
                    921: /*
1.288     rmind     922:  * IP drain processing.
1.1       cgd       923:  */
1.8       mycroft   924: void
1.211     perry     925: ip_drain(void)
1.1       cgd       926: {
                    927:
1.268     ad        928:        KERNEL_LOCK(1, NULL);
1.288     rmind     929:        ip_reass_drain();
1.268     ad        930:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       931: }
                    932:
                    933: /*
                    934:  * Do option processing on a datagram,
                    935:  * possibly discarding it if bad options are encountered,
                    936:  * or forwarding it if source-routed.
                    937:  * Returns 1 if packet has been forwarded/freed,
                    938:  * 0 if the packet should be processed further.
                    939:  */
1.8       mycroft   940: int
1.211     perry     941: ip_dooptions(struct mbuf *m)
1.1       cgd       942: {
1.109     augustss  943:        struct ip *ip = mtod(m, struct ip *);
                    944:        u_char *cp, *cp0;
                    945:        struct ip_timestamp *ipt;
                    946:        struct in_ifaddr *ia;
1.1       cgd       947:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   948:        struct in_addr dst;
1.1       cgd       949:        n_time ntime;
                    950:
1.13      mycroft   951:        dst = ip->ip_dst;
1.1       cgd       952:        cp = (u_char *)(ip + 1);
                    953:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    954:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    955:                opt = cp[IPOPT_OPTVAL];
                    956:                if (opt == IPOPT_EOL)
                    957:                        break;
                    958:                if (opt == IPOPT_NOP)
                    959:                        optlen = 1;
                    960:                else {
1.113     itojun    961:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    962:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    963:                                goto bad;
                    964:                        }
1.1       cgd       965:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    966:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       967:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    968:                                goto bad;
                    969:                        }
                    970:                }
                    971:                switch (opt) {
                    972:
                    973:                default:
                    974:                        break;
                    975:
                    976:                /*
                    977:                 * Source routing with record.
                    978:                 * Find interface with current destination address.
                    979:                 * If none on this machine then drop if strictly routed,
                    980:                 * or do nothing if loosely routed.
                    981:                 * Record interface address and bring up next address
                    982:                 * component.  If strictly routed make sure next
                    983:                 * address is on directly accessible net.
                    984:                 */
                    985:                case IPOPT_LSRR:
                    986:                case IPOPT_SSRR:
1.47      cjs       987:                        if (ip_allowsrcrt == 0) {
                    988:                                type = ICMP_UNREACH;
                    989:                                code = ICMP_UNREACH_NET_PROHIB;
                    990:                                goto bad;
                    991:                        }
1.114     itojun    992:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    993:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    994:                                goto bad;
                    995:                        }
1.1       cgd       996:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    997:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    998:                                goto bad;
                    999:                        }
                   1000:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1001:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1002:                        if (ia == 0) {
                   1003:                                if (opt == IPOPT_SSRR) {
                   1004:                                        type = ICMP_UNREACH;
                   1005:                                        code = ICMP_UNREACH_SRCFAIL;
                   1006:                                        goto bad;
                   1007:                                }
                   1008:                                /*
                   1009:                                 * Loose routing, and not at next destination
                   1010:                                 * yet; nothing to do except forward.
                   1011:                                 */
                   1012:                                break;
                   1013:                        }
                   1014:                        off--;                  /* 0 origin */
1.112     sommerfe 1015:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1016:                                /*
                   1017:                                 * End of source route.  Should be for us.
                   1018:                                 */
                   1019:                                save_rte(cp, ip->ip_src);
                   1020:                                break;
                   1021:                        }
                   1022:                        /*
                   1023:                         * locate outgoing interface
                   1024:                         */
1.281     tsutsui  1025:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd      1026:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1027:                        if (opt == IPOPT_SSRR)
1.196     itojun   1028:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1029:                        else
1.1       cgd      1030:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1031:                        if (ia == 0) {
                   1032:                                type = ICMP_UNREACH;
                   1033:                                code = ICMP_UNREACH_SRCFAIL;
                   1034:                                goto bad;
                   1035:                        }
                   1036:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1037:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1038:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1039:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1040:                        /*
                   1041:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1042:                         */
1.18      mycroft  1043:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1044:                        break;
                   1045:
                   1046:                case IPOPT_RR:
1.114     itojun   1047:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1048:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1049:                                goto bad;
                   1050:                        }
1.1       cgd      1051:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1052:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1053:                                goto bad;
                   1054:                        }
                   1055:                        /*
                   1056:                         * If no space remains, ignore.
                   1057:                         */
                   1058:                        off--;                  /* 0 origin */
1.112     sommerfe 1059:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1060:                                break;
1.281     tsutsui  1061:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1062:                            sizeof(ipaddr.sin_addr));
                   1063:                        /*
                   1064:                         * locate outgoing interface; if we're the destination,
                   1065:                         * use the incoming interface (should be same).
                   1066:                         */
1.96      thorpej  1067:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1068:                            == NULL &&
                   1069:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1070:                                type = ICMP_UNREACH;
                   1071:                                code = ICMP_UNREACH_HOST;
                   1072:                                goto bad;
                   1073:                        }
1.244     christos 1074:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1075:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1076:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1077:                        break;
                   1078:
                   1079:                case IPOPT_TS:
                   1080:                        code = cp - (u_char *)ip;
                   1081:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1082:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1083:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1084:                                goto bad;
1.114     itojun   1085:                        }
                   1086:                        if (ipt->ipt_ptr < 5) {
                   1087:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1088:                                goto bad;
                   1089:                        }
1.15      cgd      1090:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1091:                                if (++ipt->ipt_oflw == 0) {
                   1092:                                        code = (u_char *)&ipt->ipt_ptr -
                   1093:                                            (u_char *)ip;
1.1       cgd      1094:                                        goto bad;
1.114     itojun   1095:                                }
1.1       cgd      1096:                                break;
                   1097:                        }
1.104     thorpej  1098:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1099:                        switch (ipt->ipt_flg) {
                   1100:
                   1101:                        case IPOPT_TS_TSONLY:
                   1102:                                break;
                   1103:
                   1104:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1105:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1106:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1107:                                        code = (u_char *)&ipt->ipt_ptr -
                   1108:                                            (u_char *)ip;
1.1       cgd      1109:                                        goto bad;
1.114     itojun   1110:                                }
1.13      mycroft  1111:                                ipaddr.sin_addr = dst;
1.96      thorpej  1112:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1113:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1114:                                if (ia == 0)
                   1115:                                        continue;
1.104     thorpej  1116:                                bcopy(&ia->ia_addr.sin_addr,
                   1117:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1118:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1119:                                break;
                   1120:
                   1121:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1122:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1123:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1124:                                        code = (u_char *)&ipt->ipt_ptr -
                   1125:                                            (u_char *)ip;
1.1       cgd      1126:                                        goto bad;
1.114     itojun   1127:                                }
1.281     tsutsui  1128:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1129:                                    sizeof(struct in_addr));
1.96      thorpej  1130:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1131:                                    == NULL)
1.1       cgd      1132:                                        continue;
                   1133:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1134:                                break;
                   1135:
                   1136:                        default:
1.114     itojun   1137:                                /* XXX can't take &ipt->ipt_flg */
                   1138:                                code = (u_char *)&ipt->ipt_ptr -
                   1139:                                    (u_char *)ip + 1;
1.1       cgd      1140:                                goto bad;
                   1141:                        }
                   1142:                        ntime = iptime();
1.107     thorpej  1143:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1144:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1145:                            sizeof(n_time));
                   1146:                        ipt->ipt_ptr += sizeof(n_time);
                   1147:                }
                   1148:        }
                   1149:        if (forward) {
1.26      thorpej  1150:                if (ip_forwsrcrt == 0) {
                   1151:                        type = ICMP_UNREACH;
                   1152:                        code = ICMP_UNREACH_SRCFAIL;
                   1153:                        goto bad;
                   1154:                }
1.1       cgd      1155:                ip_forward(m, 1);
                   1156:                return (1);
1.13      mycroft  1157:        }
                   1158:        return (0);
1.1       cgd      1159: bad:
1.13      mycroft  1160:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1161:        IP_STATINC(IP_STAT_BADOPTIONS);
1.1       cgd      1162:        return (1);
                   1163: }
                   1164:
                   1165: /*
                   1166:  * Given address of next destination (final or next hop),
                   1167:  * return internet address info of interface to be used to get there.
                   1168:  */
                   1169: struct in_ifaddr *
1.211     perry    1170: ip_rtaddr(struct in_addr dst)
1.1       cgd      1171: {
1.249     dyoung   1172:        struct rtentry *rt;
                   1173:        union {
                   1174:                struct sockaddr         dst;
                   1175:                struct sockaddr_in      dst4;
                   1176:        } u;
                   1177:
                   1178:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1179:
                   1180:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
                   1181:                return NULL;
                   1182:
                   1183:        return ifatoia(rt->rt_ifa);
1.1       cgd      1184: }
                   1185:
                   1186: /*
                   1187:  * Save incoming source route for use in replies,
                   1188:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1189:  */
1.13      mycroft  1190: void
1.211     perry    1191: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1192: {
                   1193:        unsigned olen;
                   1194:
                   1195:        olen = option[IPOPT_OLEN];
                   1196: #ifdef DIAGNOSTIC
                   1197:        if (ipprintfs)
1.39      christos 1198:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1199: #endif /* 0 */
1.1       cgd      1200:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1201:                return;
1.281     tsutsui  1202:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1203:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1204:        ip_srcrt.dst = dst;
                   1205: }
                   1206:
                   1207: /*
                   1208:  * Retrieve incoming source route for use in replies,
                   1209:  * in the same form used by setsockopt.
                   1210:  * The first hop is placed before the options, will be removed later.
                   1211:  */
                   1212: struct mbuf *
1.211     perry    1213: ip_srcroute(void)
1.1       cgd      1214: {
1.109     augustss 1215:        struct in_addr *p, *q;
                   1216:        struct mbuf *m;
1.1       cgd      1217:
                   1218:        if (ip_nhops == 0)
1.237     dyoung   1219:                return NULL;
1.1       cgd      1220:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1221:        if (m == 0)
1.237     dyoung   1222:                return NULL;
1.1       cgd      1223:
1.164     matt     1224:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1225: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1226:
                   1227:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1228:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1229:            OPTSIZ;
                   1230: #ifdef DIAGNOSTIC
                   1231:        if (ipprintfs)
1.39      christos 1232:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1233: #endif
                   1234:
                   1235:        /*
                   1236:         * First save first hop for return route
                   1237:         */
                   1238:        p = &ip_srcrt.route[ip_nhops - 1];
                   1239:        *(mtod(m, struct in_addr *)) = *p--;
                   1240: #ifdef DIAGNOSTIC
                   1241:        if (ipprintfs)
1.39      christos 1242:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1243: #endif
                   1244:
                   1245:        /*
                   1246:         * Copy option fields and padding (nop) to mbuf.
                   1247:         */
                   1248:        ip_srcrt.nop = IPOPT_NOP;
                   1249:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1250:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1251:            OPTSIZ);
                   1252:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1253:            sizeof(struct in_addr) + OPTSIZ);
                   1254: #undef OPTSIZ
                   1255:        /*
                   1256:         * Record return path as an IP source route,
                   1257:         * reversing the path (pointers are now aligned).
                   1258:         */
                   1259:        while (p >= ip_srcrt.route) {
                   1260: #ifdef DIAGNOSTIC
                   1261:                if (ipprintfs)
1.39      christos 1262:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1263: #endif
                   1264:                *q++ = *p--;
                   1265:        }
                   1266:        /*
                   1267:         * Last hop goes to final destination.
                   1268:         */
                   1269:        *q = ip_srcrt.dst;
                   1270: #ifdef DIAGNOSTIC
                   1271:        if (ipprintfs)
1.39      christos 1272:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1273: #endif
                   1274:        return (m);
                   1275: }
                   1276:
1.139     matt     1277: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1278:        [PRC_MSGSIZE] = EMSGSIZE,
                   1279:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1280:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1281:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1282:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1283:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1284:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1285:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1286:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1287: };
                   1288:
                   1289: /*
                   1290:  * Forward a packet.  If some error occurs return the sender
                   1291:  * an icmp packet.  Note we can't always generate a meaningful
                   1292:  * icmp message because icmp doesn't have a large enough repertoire
                   1293:  * of codes and types.
                   1294:  *
                   1295:  * If not forwarding, just drop the packet.  This could be confusing
                   1296:  * if ipforwarding was zero but some routing protocol was advancing
                   1297:  * us as a gateway to somewhere.  However, we must let the routing
                   1298:  * protocol deal with that.
                   1299:  *
                   1300:  * The srcrt parameter indicates whether the packet is being forwarded
                   1301:  * via a source route.
                   1302:  */
1.13      mycroft  1303: void
1.211     perry    1304: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1305: {
1.109     augustss 1306:        struct ip *ip = mtod(m, struct ip *);
                   1307:        struct rtentry *rt;
1.220     christos 1308:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1309:        struct mbuf *mcopy;
1.13      mycroft  1310:        n_long dest;
1.249     dyoung   1311:        union {
                   1312:                struct sockaddr         dst;
                   1313:                struct sockaddr_in      dst4;
                   1314:        } u;
1.164     matt     1315:
                   1316:        /*
                   1317:         * We are now in the output path.
                   1318:         */
                   1319:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1320:
                   1321:        /*
                   1322:         * Clear any in-bound checksum flags for this packet.
                   1323:         */
                   1324:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1325:
1.13      mycroft  1326:        dest = 0;
1.1       cgd      1327: #ifdef DIAGNOSTIC
1.224     joerg    1328:        if (ipprintfs) {
                   1329:                printf("forward: src %s ", inet_ntoa(ip->ip_src));
                   1330:                printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
                   1331:        }
1.1       cgd      1332: #endif
1.93      sommerfe 1333:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1334:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1335:                m_freem(m);
                   1336:                return;
                   1337:        }
                   1338:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1339:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1340:                return;
                   1341:        }
                   1342:
1.249     dyoung   1343:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
                   1344:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1345:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1346:                return;
1.1       cgd      1347:        }
                   1348:
                   1349:        /*
1.34      mycroft  1350:         * Save at most 68 bytes of the packet in case
1.1       cgd      1351:         * we need to generate an ICMP message to the src.
1.119     itojun   1352:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1353:         */
1.155     itojun   1354:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1355:        if (mcopy)
                   1356:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1357:
1.221     christos 1358:        ip->ip_ttl -= IPTTLDEC;
                   1359:
1.1       cgd      1360:        /*
                   1361:         * If forwarding packet using same interface that it came in on,
                   1362:         * perhaps should send a redirect to sender to shortcut a hop.
                   1363:         * Only send redirect if source is sending directly to us,
                   1364:         * and if packet was not source routed (or has any options).
                   1365:         * Also, don't send redirect if forwarding using a default route
                   1366:         * or a route modified by a redirect.
                   1367:         */
                   1368:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1369:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1370:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1371:            ipsendredirects && !srcrt) {
1.19      mycroft  1372:                if (rt->rt_ifa &&
                   1373:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1374:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1375:                        if (rt->rt_flags & RTF_GATEWAY)
                   1376:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1377:                        else
                   1378:                                dest = ip->ip_dst.s_addr;
                   1379:                        /*
                   1380:                         * Router requirements says to only send host
                   1381:                         * redirects.
                   1382:                         */
                   1383:                        type = ICMP_REDIRECT;
                   1384:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1385: #ifdef DIAGNOSTIC
1.77      thorpej  1386:                        if (ipprintfs)
                   1387:                                printf("redirect (%d) to %x\n", code,
                   1388:                                    (u_int32_t)dest);
1.1       cgd      1389: #endif
                   1390:                }
                   1391:        }
                   1392:
1.238     dyoung   1393:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1394:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1395:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1396:
1.1       cgd      1397:        if (error)
1.266     thorpej  1398:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1399:        else {
1.266     thorpej  1400:                uint64_t *ips = IP_STAT_GETREF();
                   1401:                ips[IP_STAT_FORWARD]++;
                   1402:                if (type) {
                   1403:                        ips[IP_STAT_REDIRECTSENT]++;
                   1404:                        IP_STAT_PUTREF();
                   1405:                } else {
                   1406:                        IP_STAT_PUTREF();
1.63      matt     1407:                        if (mcopy) {
                   1408: #ifdef GATEWAY
1.64      thorpej  1409:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1410:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1411: #endif
1.1       cgd      1412:                                m_freem(mcopy);
1.63      matt     1413:                        }
1.1       cgd      1414:                        return;
                   1415:                }
                   1416:        }
                   1417:        if (mcopy == NULL)
                   1418:                return;
1.13      mycroft  1419:
1.1       cgd      1420:        switch (error) {
                   1421:
                   1422:        case 0:                         /* forwarded, but need redirect */
                   1423:                /* type, code set above */
                   1424:                break;
                   1425:
                   1426:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1427:        case EHOSTUNREACH:
                   1428:        case ENETDOWN:
                   1429:        case EHOSTDOWN:
                   1430:        default:
                   1431:                type = ICMP_UNREACH;
                   1432:                code = ICMP_UNREACH_HOST;
                   1433:                break;
                   1434:
                   1435:        case EMSGSIZE:
                   1436:                type = ICMP_UNREACH;
                   1437:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1438:
1.274     seanb    1439:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
                   1440:                        destmtu = rt->rt_ifp->if_mtu;
1.263     cube     1441:
                   1442: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274     seanb    1443:                {
1.263     cube     1444:                        /*
                   1445:                         * If the packet is routed over IPsec tunnel, tell the
                   1446:                         * originator the tunnel MTU.
                   1447:                         *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1448:                         * XXX quickhack!!!
                   1449:                         */
                   1450:
1.89      itojun   1451:                        struct secpolicy *sp;
                   1452:                        int ipsecerror;
1.95      itojun   1453:                        size_t ipsechdr;
1.89      itojun   1454:                        struct route *ro;
                   1455:
                   1456:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1457:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1458:                            &ipsecerror);
1.89      itojun   1459:
1.263     cube     1460:                        if (sp != NULL) {
1.89      itojun   1461:                                /* count IPsec header size */
1.95      itojun   1462:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1463:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1464:
                   1465:                                /*
                   1466:                                 * find the correct route for outer IPv4
                   1467:                                 * header, compute tunnel MTU.
                   1468:                                 */
1.220     christos 1469:
1.89      itojun   1470:                                if (sp->req != NULL
1.95      itojun   1471:                                 && sp->req->sav != NULL
                   1472:                                 && sp->req->sav->sah != NULL) {
                   1473:                                        ro = &sp->req->sav->sah->sa_route;
1.274     seanb    1474:                                        rt = rtcache_validate(ro);
1.257     dyoung   1475:                                        if (rt && rt->rt_ifp) {
1.220     christos 1476:                                                destmtu =
1.257     dyoung   1477:                                                    rt->rt_rmx.rmx_mtu ?
                   1478:                                                    rt->rt_rmx.rmx_mtu :
                   1479:                                                    rt->rt_ifp->if_mtu;
1.220     christos 1480:                                                destmtu -= ipsechdr;
1.89      itojun   1481:                                        }
                   1482:                                }
                   1483:
1.173     jonathan 1484: #ifdef IPSEC
1.89      itojun   1485:                                key_freesp(sp);
1.173     jonathan 1486: #else
                   1487:                                KEY_FREESP(&sp);
                   1488: #endif
1.89      itojun   1489:                        }
1.274     seanb    1490:                }
1.263     cube     1491: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266     thorpej  1492:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1493:                break;
                   1494:
                   1495:        case ENOBUFS:
1.143     itojun   1496: #if 1
                   1497:                /*
                   1498:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1499:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1500:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1501:                 * or if the underlying interface is rate-limited.
1.143     itojun   1502:                 */
                   1503:                if (mcopy)
                   1504:                        m_freem(mcopy);
                   1505:                return;
                   1506: #else
1.1       cgd      1507:                type = ICMP_SOURCEQUENCH;
                   1508:                code = 0;
                   1509:                break;
1.143     itojun   1510: #endif
1.1       cgd      1511:        }
1.220     christos 1512:        icmp_error(mcopy, type, code, dest, destmtu);
1.44      thorpej  1513: }
                   1514:
                   1515: void
1.211     perry    1516: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1517:     struct mbuf *m)
1.44      thorpej  1518: {
                   1519:
1.283     minskim  1520:        if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278     christos 1521: #ifdef SO_OTIMESTAMP
1.283     minskim  1522:            || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278     christos 1523: #endif
                   1524:            ) {
1.44      thorpej  1525:                struct timeval tv;
                   1526:
                   1527:                microtime(&tv);
1.278     christos 1528: #ifdef SO_OTIMESTAMP
                   1529:                if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
                   1530:                        struct timeval50 tv50;
                   1531:                        timeval_to_timeval50(&tv, &tv50);
                   1532:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1533:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1534:                } else
                   1535: #endif
1.244     christos 1536:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1537:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1538:                if (*mp)
                   1539:                        mp = &(*mp)->m_next;
                   1540:        }
                   1541:        if (inp->inp_flags & INP_RECVDSTADDR) {
1.244     christos 1542:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1543:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1544:                if (*mp)
                   1545:                        mp = &(*mp)->m_next;
                   1546:        }
                   1547: #ifdef notyet
                   1548:        /*
                   1549:         * XXX
                   1550:         * Moving these out of udp_input() made them even more broken
                   1551:         * than they already were.
                   1552:         *      - fenner@parc.xerox.com
                   1553:         */
                   1554:        /* options were tossed already */
                   1555:        if (inp->inp_flags & INP_RECVOPTS) {
1.244     christos 1556:                *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44      thorpej  1557:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1558:                if (*mp)
                   1559:                        mp = &(*mp)->m_next;
                   1560:        }
                   1561:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1562:        if (inp->inp_flags & INP_RECVRETOPTS) {
1.244     christos 1563:                *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44      thorpej  1564:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1565:                if (*mp)
                   1566:                        mp = &(*mp)->m_next;
                   1567:        }
                   1568: #endif
                   1569:        if (inp->inp_flags & INP_RECVIF) {
                   1570:                struct sockaddr_dl sdl;
                   1571:
1.252     dyoung   1572:                sockaddr_dl_init(&sdl, sizeof(sdl),
                   1573:                    (m->m_pkthdr.rcvif != NULL)
                   1574:                        ?  m->m_pkthdr.rcvif->if_index
                   1575:                        : 0,
                   1576:                        0, NULL, 0, NULL, 0);
1.251     dyoung   1577:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1578:                if (*mp)
                   1579:                        mp = &(*mp)->m_next;
                   1580:        }
1.282     minskim  1581:        if (inp->inp_flags & INP_RECVTTL) {
                   1582:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1583:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1584:                if (*mp)
                   1585:                        mp = &(*mp)->m_next;
                   1586:        }
1.13      mycroft  1587: }
                   1588:
1.189     atatat   1589: /*
1.228     elad     1590:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1591:  */
                   1592: static int
                   1593: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1594: {
                   1595:        int error, tmp;
                   1596:        struct sysctlnode node;
                   1597:
                   1598:        node = *rnode;
                   1599:        tmp = ip_forwsrcrt;
                   1600:        node.sysctl_data = &tmp;
                   1601:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1602:        if (error || newp == NULL)
                   1603:                return (error);
                   1604:
1.280     elad     1605:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1606:            0, NULL, NULL, NULL);
                   1607:        if (error)
                   1608:                return (error);
1.228     elad     1609:
                   1610:        ip_forwsrcrt = tmp;
                   1611:
                   1612:        return (0);
                   1613: }
                   1614:
                   1615: /*
1.189     atatat   1616:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1617:  * range of the new value and tweaks timers if it changes.
                   1618:  */
                   1619: static int
                   1620: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1621: {
1.189     atatat   1622:        int error, tmp;
                   1623:        struct sysctlnode node;
                   1624:
                   1625:        node = *rnode;
                   1626:        tmp = ip_mtudisc_timeout;
                   1627:        node.sysctl_data = &tmp;
                   1628:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1629:        if (error || newp == NULL)
                   1630:                return (error);
                   1631:        if (tmp < 0)
                   1632:                return (EINVAL);
1.52      thorpej  1633:
1.273     matt     1634:        mutex_enter(softnet_lock);
                   1635:
1.189     atatat   1636:        ip_mtudisc_timeout = tmp;
                   1637:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1638:
1.273     matt     1639:        mutex_exit(softnet_lock);
                   1640:
1.189     atatat   1641:        return (0);
                   1642: }
1.54      lukem    1643:
1.65      matt     1644: #ifdef GATEWAY
1.189     atatat   1645: /*
1.247     liamjfoy 1646:  * sysctl helper routine for net.inet.ip.maxflows.
1.189     atatat   1647:  */
                   1648: static int
                   1649: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   1650: {
1.273     matt     1651:        int error;
1.67      thorpej  1652:
1.273     matt     1653:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1654:        if (error || newp == NULL)
                   1655:                return (error);
                   1656:
                   1657:        mutex_enter(softnet_lock);
                   1658:        KERNEL_LOCK(1, NULL);
1.212     perry    1659:
1.265     thorpej  1660:        ipflow_prune();
1.273     matt     1661:
                   1662:        KERNEL_UNLOCK_ONE(NULL);
                   1663:        mutex_exit(softnet_lock);
1.144     martin   1664:
1.189     atatat   1665:        return (0);
                   1666: }
1.248     liamjfoy 1667:
                   1668: static int
                   1669: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283     minskim  1670: {
1.248     liamjfoy 1671:        int error, tmp;
                   1672:        struct sysctlnode node;
                   1673:
                   1674:        node = *rnode;
                   1675:        tmp = ip_hashsize;
                   1676:        node.sysctl_data = &tmp;
                   1677:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1678:        if (error || newp == NULL)
                   1679:                return (error);
                   1680:
                   1681:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1682:                /*
                   1683:                 * Can only fail due to malloc()
                   1684:                 */
1.273     matt     1685:                mutex_enter(softnet_lock);
                   1686:                KERNEL_LOCK(1, NULL);
                   1687:
                   1688:                error = ipflow_invalidate_all(tmp);
                   1689:
                   1690:                KERNEL_UNLOCK_ONE(NULL);
                   1691:                mutex_exit(softnet_lock);
                   1692:
1.248     liamjfoy 1693:        } else {
                   1694:                /*
                   1695:                 * EINVAL if not a power of 2
                   1696:                 */
1.273     matt     1697:                error = EINVAL;
1.283     minskim  1698:        }
1.248     liamjfoy 1699:
1.273     matt     1700:        return error;
1.248     liamjfoy 1701: }
1.189     atatat   1702: #endif /* GATEWAY */
1.117     tron     1703:
1.266     thorpej  1704: static int
                   1705: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1706: {
                   1707:
1.271     thorpej  1708:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1709: }
1.131     itojun   1710:
1.284     pooka    1711: static void
                   1712: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1713: {
                   1714:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 1715:
1.197     atatat   1716:        sysctl_createv(clog, 0, NULL, NULL,
                   1717:                       CTLFLAG_PERMANENT,
1.189     atatat   1718:                       CTLTYPE_NODE, "net", NULL,
                   1719:                       NULL, 0, NULL, 0,
                   1720:                       CTL_NET, CTL_EOL);
1.197     atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT,
1.203     atatat   1723:                       CTLTYPE_NODE, "inet",
                   1724:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1725:                       NULL, 0, NULL, 0,
                   1726:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1727:        sysctl_createv(clog, 0, NULL, NULL,
                   1728:                       CTLFLAG_PERMANENT,
1.203     atatat   1729:                       CTLTYPE_NODE, "ip",
                   1730:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1731:                       NULL, 0, NULL, 0,
                   1732:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1733:
1.197     atatat   1734:        sysctl_createv(clog, 0, NULL, NULL,
                   1735:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1736:                       CTLTYPE_INT, "forwarding",
                   1737:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1738:                       NULL, 0, &ipforwarding, 0,
                   1739:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1740:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1741:        sysctl_createv(clog, 0, NULL, NULL,
                   1742:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1743:                       CTLTYPE_INT, "redirect",
                   1744:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1745:                       NULL, 0, &ipsendredirects, 0,
                   1746:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1747:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1748:        sysctl_createv(clog, 0, NULL, NULL,
                   1749:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1750:                       CTLTYPE_INT, "ttl",
                   1751:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1752:                       NULL, 0, &ip_defttl, 0,
                   1753:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1754:                       IPCTL_DEFTTL, CTL_EOL);
                   1755: #ifdef IPCTL_DEFMTU
1.197     atatat   1756:        sysctl_createv(clog, 0, NULL, NULL,
                   1757:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1758:                       CTLTYPE_INT, "mtu",
                   1759:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1760:                       NULL, 0, &ip_mtu, 0,
                   1761:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1762:                       IPCTL_DEFMTU, CTL_EOL);
                   1763: #endif /* IPCTL_DEFMTU */
1.197     atatat   1764:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1765:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1766:                       CTLTYPE_INT, "forwsrcrt",
                   1767:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1768:                                    "datagrams"),
1.228     elad     1769:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1770:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1771:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1772:        sysctl_createv(clog, 0, NULL, NULL,
                   1773:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1774:                       CTLTYPE_INT, "directed-broadcast",
                   1775:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1776:                       NULL, 0, &ip_directedbcast, 0,
                   1777:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1778:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1779:        sysctl_createv(clog, 0, NULL, NULL,
                   1780:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1781:                       CTLTYPE_INT, "allowsrcrt",
                   1782:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1783:                       NULL, 0, &ip_allowsrcrt, 0,
                   1784:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1785:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   1786:        sysctl_createv(clog, 0, NULL, NULL,
                   1787:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1788:                       CTLTYPE_INT, "subnetsarelocal",
                   1789:                       SYSCTL_DESCR("Whether logical subnets are considered "
                   1790:                                    "local"),
1.189     atatat   1791:                       NULL, 0, &subnetsarelocal, 0,
                   1792:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1793:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   1794:        sysctl_createv(clog, 0, NULL, NULL,
                   1795:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1796:                       CTLTYPE_INT, "mtudisc",
                   1797:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1798:                       NULL, 0, &ip_mtudisc, 0,
                   1799:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1800:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1801:        sysctl_createv(clog, 0, NULL, NULL,
                   1802:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1803:                       CTLTYPE_INT, "anonportmin",
                   1804:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1805:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1806:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1807:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1808:        sysctl_createv(clog, 0, NULL, NULL,
                   1809:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1810:                       CTLTYPE_INT, "anonportmax",
                   1811:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1812:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1813:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1814:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1817:                       CTLTYPE_INT, "mtudisctimeout",
                   1818:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   1819:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   1820:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1821:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1822: #ifdef GATEWAY
1.197     atatat   1823:        sysctl_createv(clog, 0, NULL, NULL,
                   1824:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1825:                       CTLTYPE_INT, "maxflows",
                   1826:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   1827:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   1828:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1829:                       IPCTL_MAXFLOWS, CTL_EOL);
1.248     liamjfoy 1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1832:                        CTLTYPE_INT, "hashsize",
                   1833:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
                   1834:                        sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
                   1835:                        CTL_NET, PF_INET, IPPROTO_IP,
                   1836:                        CTL_CREATE, CTL_EOL);
1.189     atatat   1837: #endif /* GATEWAY */
1.197     atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1840:                       CTLTYPE_INT, "hostzerobroadcast",
                   1841:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   1842:                       NULL, 0, &hostzeroisbroadcast, 0,
                   1843:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1844:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   1845: #if NGIF > 0
1.197     atatat   1846:        sysctl_createv(clog, 0, NULL, NULL,
                   1847:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1848:                       CTLTYPE_INT, "gifttl",
                   1849:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   1850:                       NULL, 0, &ip_gif_ttl, 0,
                   1851:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1852:                       IPCTL_GIF_TTL, CTL_EOL);
                   1853: #endif /* NGIF */
                   1854: #ifndef IPNOPRIVPORTS
1.197     atatat   1855:        sysctl_createv(clog, 0, NULL, NULL,
                   1856:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1857:                       CTLTYPE_INT, "lowportmin",
                   1858:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1859:                                    "to assign"),
1.189     atatat   1860:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1861:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1862:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1863:        sysctl_createv(clog, 0, NULL, NULL,
                   1864:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1865:                       CTLTYPE_INT, "lowportmax",
                   1866:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1867:                                    "to assign"),
1.189     atatat   1868:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1869:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1870:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1871: #endif /* IPNOPRIVPORTS */
                   1872: #if NGRE > 0
1.197     atatat   1873:        sysctl_createv(clog, 0, NULL, NULL,
                   1874:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1875:                       CTLTYPE_INT, "grettl",
                   1876:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1877:                       NULL, 0, &ip_gre_ttl, 0,
                   1878:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1879:                       IPCTL_GRE_TTL, CTL_EOL);
                   1880: #endif /* NGRE */
1.197     atatat   1881:        sysctl_createv(clog, 0, NULL, NULL,
                   1882:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1883:                       CTLTYPE_INT, "checkinterface",
                   1884:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1885:                                    "from RFC1122"),
1.189     atatat   1886:                       NULL, 0, &ip_checkinterface, 0,
                   1887:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1888:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1889:        sysctl_createv(clog, 0, NULL, NULL,
                   1890:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1891:                       CTLTYPE_INT, "random_id",
                   1892:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1893:                       NULL, 0, &ip_do_randomid, 0,
                   1894:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1895:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1896:        sysctl_createv(clog, 0, NULL, NULL,
                   1897:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1898:                       CTLTYPE_INT, "do_loopback_cksum",
                   1899:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1900:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1901:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1902:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1903:        sysctl_createv(clog, 0, NULL, NULL,
                   1904:                       CTLFLAG_PERMANENT,
                   1905:                       CTLTYPE_STRUCT, "stats",
                   1906:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1907:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1908:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1909:                       CTL_EOL);
1.1       cgd      1910: }
1.266     thorpej  1911:
                   1912: void
                   1913: ip_statinc(u_int stat)
                   1914: {
                   1915:
                   1916:        KASSERT(stat < IP_NSTATS);
                   1917:        IP_STATINC(stat);
                   1918: }

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