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Annotation of src/sys/netinet/ip_input.c, Revision 1.189

1.189   ! atatat      1: /*     $NetBSD: ip_input.c,v 1.188 2003/12/04 10:02:35 scw Exp $       */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
1.172     agc        81:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        82:  *    may be used to endorse or promote products derived from this software
                     83:  *    without specific prior written permission.
                     84:  *
                     85:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     86:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     87:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     88:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     89:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     90:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     91:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     92:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     93:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     94:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     95:  * SUCH DAMAGE.
                     96:  *
1.14      cgd        97:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        98:  */
1.141     lukem      99:
                    100: #include <sys/cdefs.h>
1.189   ! atatat    101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.188 2003/12/04 10:02:35 scw Exp $");
1.55      scottr    102:
1.184     jonathan  103: #include "opt_inet.h"
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91      thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.167     martin    108: #include "opt_mbuftrace.h"
1.135     thorpej   109: #include "opt_inet_csum.h"
1.1       cgd       110:
1.5       mycroft   111: #include <sys/param.h>
                    112: #include <sys/systm.h>
                    113: #include <sys/malloc.h>
                    114: #include <sys/mbuf.h>
                    115: #include <sys/domain.h>
                    116: #include <sys/protosw.h>
                    117: #include <sys/socket.h>
1.44      thorpej   118: #include <sys/socketvar.h>
1.5       mycroft   119: #include <sys/errno.h>
                    120: #include <sys/time.h>
                    121: #include <sys/kernel.h>
1.72      thorpej   122: #include <sys/pool.h>
1.28      christos  123: #include <sys/sysctl.h>
1.1       cgd       124:
1.5       mycroft   125: #include <net/if.h>
1.44      thorpej   126: #include <net/if_dl.h>
1.5       mycroft   127: #include <net/route.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
                    134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
                    136: #include <netinet/ip_icmp.h>
1.89      itojun    137: /* just for gif_ttl */
                    138: #include <netinet/in_gif.h>
                    139: #include "gif.h"
1.144     martin    140: #include <net/if_gre.h>
                    141: #include "gre.h"
1.111     jdolecek  142:
                    143: #ifdef MROUTING
                    144: #include <netinet/ip_mroute.h>
                    145: #endif
1.89      itojun    146:
                    147: #ifdef IPSEC
                    148: #include <netinet6/ipsec.h>
                    149: #include <netkey/key.h>
                    150: #endif
1.173     jonathan  151: #ifdef FAST_IPSEC
                    152: #include <netipsec/ipsec.h>
                    153: #include <netipsec/key.h>
                    154: #endif /* FAST_IPSEC*/
1.44      thorpej   155:
1.1       cgd       156: #ifndef        IPFORWARDING
                    157: #ifdef GATEWAY
                    158: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    159: #else /* GATEWAY */
                    160: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    161: #endif /* GATEWAY */
                    162: #endif /* IPFORWARDING */
                    163: #ifndef        IPSENDREDIRECTS
                    164: #define        IPSENDREDIRECTS 1
                    165: #endif
1.26      thorpej   166: #ifndef IPFORWSRCRT
1.47      cjs       167: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    168: #endif
                    169: #ifndef IPALLOWSRCRT
1.48      mrg       170: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   171: #endif
1.53      kml       172: #ifndef IPMTUDISC
1.153     itojun    173: #define IPMTUDISC      1
1.53      kml       174: #endif
1.60      kml       175: #ifndef IPMTUDISCTIMEOUT
1.61      kml       176: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       177: #endif
1.53      kml       178:
1.27      thorpej   179: /*
                    180:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    181:  * configuration using this option will Just Work.
                    182:  */
                    183: #ifndef IPDIRECTEDBCAST
                    184: #ifdef DIRECTED_BROADCAST
                    185: #define IPDIRECTEDBCAST        1
                    186: #else
                    187: #define        IPDIRECTEDBCAST 0
                    188: #endif /* DIRECTED_BROADCAST */
                    189: #endif /* IPDIRECTEDBCAST */
1.1       cgd       190: int    ipforwarding = IPFORWARDING;
                    191: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   192: int    ip_defttl = IPDEFTTL;
1.26      thorpej   193: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   194: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       195: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       196: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    197: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       198: #ifdef DIAGNOSTIC
                    199: int    ipprintfs = 0;
                    200: #endif
1.184     jonathan  201:
                    202: int    ip_do_randomid = 0;
                    203:
1.165     christos  204: /*
                    205:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    206:  * the Strong ES model described in RFC 1122, but since the routing table
                    207:  * and transmit implementation do not implement the Strong ES model,
                    208:  * setting this to 1 results in an odd hybrid.
                    209:  *
                    210:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    211:  * to translate the destination address to another local interface.
                    212:  *
                    213:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    214:  * to the loopback interface instead of the interface where the
                    215:  * packets for those addresses are received.
                    216:  */
                    217: int    ip_checkinterface = 0;
                    218:
1.1       cgd       219:
1.60      kml       220: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    221:
1.1       cgd       222: extern struct domain inetdomain;
                    223: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      224: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    225: int    in_ifaddrentries;                       /* total number of addrs */
1.181     jonathan  226: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       227: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      228: u_long in_multihash;                           /* size of hash table - 1 */
                    229: int    in_multientries;                        /* total number of addrs */
                    230: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   231: struct ifqueue ipintrq;
1.63      matt      232: struct ipstat  ipstat;
1.183     jonathan  233: uint16_t ip_id;
1.75      thorpej   234:
1.121     thorpej   235: #ifdef PFIL_HOOKS
                    236: struct pfil_head inet_pfil_hook;
                    237: #endif
                    238:
1.63      matt      239: struct ipqhead ipq;
1.75      thorpej   240: int    ipq_locked;
1.131     itojun    241: int    ip_nfragpackets = 0;
1.133     itojun    242: int    ip_maxfragpackets = 200;
1.75      thorpej   243:
                    244: static __inline int ipq_lock_try __P((void));
                    245: static __inline void ipq_unlock __P((void));
                    246:
                    247: static __inline int
                    248: ipq_lock_try()
                    249: {
                    250:        int s;
                    251:
1.132     thorpej   252:        /*
1.149     wiz       253:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   254:         * mbuf allocation.
                    255:         */
                    256:        s = splvm();
1.75      thorpej   257:        if (ipq_locked) {
                    258:                splx(s);
                    259:                return (0);
                    260:        }
                    261:        ipq_locked = 1;
                    262:        splx(s);
                    263:        return (1);
                    264: }
                    265:
                    266: static __inline void
                    267: ipq_unlock()
                    268: {
                    269:        int s;
                    270:
1.132     thorpej   271:        s = splvm();
1.75      thorpej   272:        ipq_locked = 0;
                    273:        splx(s);
                    274: }
                    275:
                    276: #ifdef DIAGNOSTIC
                    277: #define        IPQ_LOCK()                                                      \
                    278: do {                                                                   \
                    279:        if (ipq_lock_try() == 0) {                                      \
                    280:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    281:                panic("ipq_lock");                                      \
                    282:        }                                                               \
1.159     perry     283: } while (/*CONSTCOND*/ 0)
1.75      thorpej   284: #define        IPQ_LOCK_CHECK()                                                \
                    285: do {                                                                   \
                    286:        if (ipq_locked == 0) {                                          \
                    287:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    288:                panic("ipq lock check");                                \
                    289:        }                                                               \
1.159     perry     290: } while (/*CONSTCOND*/ 0)
1.75      thorpej   291: #else
                    292: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    293: #define        IPQ_LOCK_CHECK()        /* nothing */
                    294: #endif
                    295:
                    296: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       297:
1.166     matt      298: struct pool inmulti_pool;
1.72      thorpej   299: struct pool ipqent_pool;
                    300:
1.135     thorpej   301: #ifdef INET_CSUM_COUNTERS
                    302: #include <sys/device.h>
                    303:
                    304: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    305:     NULL, "inet", "hwcsum bad");
                    306: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    307:     NULL, "inet", "hwcsum ok");
                    308: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    309:     NULL, "inet", "swcsum");
                    310:
                    311: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    312:
                    313: #else
                    314:
                    315: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    316:
                    317: #endif /* INET_CSUM_COUNTERS */
                    318:
1.1       cgd       319: /*
                    320:  * We need to save the IP options in case a protocol wants to respond
                    321:  * to an incoming packet over the same route if the packet got here
                    322:  * using IP source routing.  This allows connection establishment and
                    323:  * maintenance when the remote end is on a network that is not known
                    324:  * to us.
                    325:  */
                    326: int    ip_nhops = 0;
                    327: static struct ip_srcrt {
                    328:        struct  in_addr dst;                    /* final destination */
                    329:        char    nop;                            /* one NOP to align */
                    330:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    331:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    332: } ip_srcrt;
                    333:
1.13      mycroft   334: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   335:
1.164     matt      336: #ifdef MBUFTRACE
                    337: struct mowner ip_rx_mowner = { "internet", "rx" };
                    338: struct mowner ip_tx_mowner = { "internet", "tx" };
                    339: #endif
                    340:
1.1       cgd       341: /*
                    342:  * IP initialization: fill in IP protocol switch table.
                    343:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    344:  */
1.8       mycroft   345: void
1.1       cgd       346: ip_init()
                    347: {
1.109     augustss  348:        struct protosw *pr;
                    349:        int i;
1.1       cgd       350:
1.166     matt      351:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    352:            NULL);
1.72      thorpej   353:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   354:            NULL);
1.72      thorpej   355:
1.1       cgd       356:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    357:        if (pr == 0)
                    358:                panic("ip_init");
                    359:        for (i = 0; i < IPPROTO_MAX; i++)
                    360:                ip_protox[i] = pr - inetsw;
                    361:        for (pr = inetdomain.dom_protosw;
                    362:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    363:                if (pr->pr_domain->dom_family == PF_INET &&
                    364:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    365:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       366:        LIST_INIT(&ipq);
1.183     jonathan  367:        ip_id = time.tv_sec & 0xfffff;
1.1       cgd       368:        ipintrq.ifq_maxlen = ipqmaxlen;
1.181     jonathan  369:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        370:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    371:            M_WAITOK, &in_ifaddrhash);
1.166     matt      372:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    373:            M_WAITOK, &in_multihash);
1.160     itojun    374:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   375: #ifdef GATEWAY
                    376:        ipflow_init();
                    377: #endif
1.121     thorpej   378:
                    379: #ifdef PFIL_HOOKS
                    380:        /* Register our Packet Filter hook. */
1.126     thorpej   381:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    382:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   383:        i = pfil_head_register(&inet_pfil_hook);
                    384:        if (i != 0)
                    385:                printf("ip_init: WARNING: unable to register pfil hook, "
                    386:                    "error %d\n", i);
                    387: #endif /* PFIL_HOOKS */
1.135     thorpej   388:
                    389: #ifdef INET_CSUM_COUNTERS
                    390:        evcnt_attach_static(&ip_hwcsum_bad);
                    391:        evcnt_attach_static(&ip_hwcsum_ok);
                    392:        evcnt_attach_static(&ip_swcsum);
                    393: #endif /* INET_CSUM_COUNTERS */
1.164     matt      394:
                    395: #ifdef MBUFTRACE
                    396:        MOWNER_ATTACH(&ip_tx_mowner);
                    397:        MOWNER_ATTACH(&ip_rx_mowner);
                    398: #endif /* MBUFTRACE */
1.1       cgd       399: }
                    400:
                    401: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    402: struct route ipforward_rt;
                    403:
                    404: /*
1.89      itojun    405:  * IP software interrupt routine
                    406:  */
                    407: void
                    408: ipintr()
                    409: {
                    410:        int s;
                    411:        struct mbuf *m;
                    412:
                    413:        while (1) {
1.132     thorpej   414:                s = splnet();
1.89      itojun    415:                IF_DEQUEUE(&ipintrq, m);
                    416:                splx(s);
                    417:                if (m == 0)
                    418:                        return;
1.164     matt      419:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    420:                ip_input(m);
                    421:        }
                    422: }
                    423:
                    424: /*
1.1       cgd       425:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    426:  * try to reassemble.  Process options.  Pass to next level.
                    427:  */
1.8       mycroft   428: void
1.89      itojun    429: ip_input(struct mbuf *m)
1.1       cgd       430: {
1.109     augustss  431:        struct ip *ip = NULL;
                    432:        struct ipq *fp;
                    433:        struct in_ifaddr *ia;
                    434:        struct ifaddr *ifa;
1.25      cgd       435:        struct ipqent *ipqe;
1.89      itojun    436:        int hlen = 0, mff, len;
1.100     itojun    437:        int downmatch;
1.165     christos  438:        int checkif;
1.169     itojun    439:        int srcrt = 0;
1.173     jonathan  440: #ifdef FAST_IPSEC
                    441:        struct m_tag *mtag;
                    442:        struct tdb_ident *tdbi;
                    443:        struct secpolicy *sp;
                    444:        int s, error;
                    445: #endif /* FAST_IPSEC */
1.1       cgd       446:
1.164     matt      447:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       448: #ifdef DIAGNOSTIC
                    449:        if ((m->m_flags & M_PKTHDR) == 0)
                    450:                panic("ipintr no HDR");
1.89      itojun    451: #endif
1.164     matt      452:
1.1       cgd       453:        /*
                    454:         * If no IP addresses have been set yet but the interfaces
                    455:         * are receiving, can't do anything with incoming packets yet.
                    456:         */
1.181     jonathan  457:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       458:                goto bad;
                    459:        ipstat.ips_total++;
1.154     thorpej   460:        /*
                    461:         * If the IP header is not aligned, slurp it up into a new
                    462:         * mbuf with space for link headers, in the event we forward
                    463:         * it.  Otherwise, if it is aligned, make sure the entire
                    464:         * base IP header is in the first mbuf of the chain.
                    465:         */
                    466:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    467:                if ((m = m_copyup(m, sizeof(struct ip),
                    468:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    469:                        /* XXXJRT new stat, please */
                    470:                        ipstat.ips_toosmall++;
                    471:                        return;
                    472:                }
                    473:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    474:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    475:                        ipstat.ips_toosmall++;
                    476:                        return;
                    477:                }
1.1       cgd       478:        }
                    479:        ip = mtod(m, struct ip *);
1.13      mycroft   480:        if (ip->ip_v != IPVERSION) {
                    481:                ipstat.ips_badvers++;
                    482:                goto bad;
                    483:        }
1.1       cgd       484:        hlen = ip->ip_hl << 2;
                    485:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    486:                ipstat.ips_badhlen++;
                    487:                goto bad;
                    488:        }
                    489:        if (hlen > m->m_len) {
                    490:                if ((m = m_pullup(m, hlen)) == 0) {
                    491:                        ipstat.ips_badhlen++;
1.89      itojun    492:                        return;
1.1       cgd       493:                }
                    494:                ip = mtod(m, struct ip *);
                    495:        }
1.98      thorpej   496:
1.85      hwr       497:        /*
1.99      thorpej   498:         * RFC1122: packets with a multicast source address are
1.98      thorpej   499:         * not allowed.
1.85      hwr       500:         */
                    501:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    502:                ipstat.ips_badaddr++;
1.85      hwr       503:                goto bad;
1.129     itojun    504:        }
                    505:
                    506:        /* 127/8 must not appear on wire - RFC1122 */
                    507:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    508:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    509:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    510:                        ipstat.ips_badaddr++;
1.129     itojun    511:                        goto bad;
1.130     itojun    512:                }
1.85      hwr       513:        }
                    514:
1.135     thorpej   515:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   516:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   517:                 M_CSUM_IPv4_BAD)) {
                    518:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    519:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    520:                goto badcsum;
                    521:
                    522:        case M_CSUM_IPv4:
                    523:                /* Checksum was okay. */
                    524:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    525:                break;
                    526:
                    527:        default:
                    528:                /* Must compute it ourselves. */
                    529:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    530:                if (in_cksum(m, hlen) != 0)
                    531:                        goto bad;
                    532:                break;
1.1       cgd       533:        }
                    534:
1.121     thorpej   535:        /* Retrieve the packet length. */
                    536:        len = ntohs(ip->ip_len);
1.81      proff     537:
                    538:        /*
                    539:         * Check for additional length bogosity
                    540:         */
1.84      proff     541:        if (len < hlen) {
1.81      proff     542:                ipstat.ips_badlen++;
                    543:                goto bad;
                    544:        }
1.1       cgd       545:
                    546:        /*
                    547:         * Check that the amount of data in the buffers
                    548:         * is as at least much as the IP header would have us expect.
                    549:         * Trim mbufs if longer than we expect.
                    550:         * Drop packet if shorter than we expect.
                    551:         */
1.35      mycroft   552:        if (m->m_pkthdr.len < len) {
1.1       cgd       553:                ipstat.ips_tooshort++;
                    554:                goto bad;
                    555:        }
1.35      mycroft   556:        if (m->m_pkthdr.len > len) {
1.1       cgd       557:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   558:                        m->m_len = len;
                    559:                        m->m_pkthdr.len = len;
1.1       cgd       560:                } else
1.35      mycroft   561:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       562:        }
                    563:
1.188     scw       564: #if defined(IPSEC) || defined(FAST_IPSEC)
1.149     wiz       565:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    566:        m->m_flags &= ~M_CANFASTFWD;
                    567: #else
1.64      thorpej   568:        /*
                    569:         * Assume that we can create a fast-forward IP flow entry
                    570:         * based on this packet.
                    571:         */
                    572:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    573: #endif
1.64      thorpej   574:
1.36      mrg       575: #ifdef PFIL_HOOKS
1.33      mrg       576:        /*
1.64      thorpej   577:         * Run through list of hooks for input packets.  If there are any
                    578:         * filters which require that additional packets in the flow are
                    579:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    580:         * Note that filters must _never_ set this flag, as another filter
                    581:         * in the list may have previously cleared it.
1.33      mrg       582:         */
1.127     itojun    583:        /*
                    584:         * let ipfilter look at packet on the wire,
                    585:         * not the decapsulated packet.
                    586:         */
                    587: #ifdef IPSEC
1.136     itojun    588:        if (!ipsec_getnhist(m))
1.186     scw       589: #elif defined(FAST_IPSEC)
                    590:        if (!ipsec_indone(m))
1.127     itojun    591: #else
                    592:        if (1)
                    593: #endif
                    594:        {
1.169     itojun    595:                struct in_addr odst;
                    596:
                    597:                odst = ip->ip_dst;
1.127     itojun    598:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    599:                    PFIL_IN) != 0)
                    600:                        return;
1.127     itojun    601:                if (m == NULL)
                    602:                        return;
                    603:                ip = mtod(m, struct ip *);
1.142     darrenr   604:                hlen = ip->ip_hl << 2;
1.169     itojun    605:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    606:        }
1.36      mrg       607: #endif /* PFIL_HOOKS */
1.123     thorpej   608:
                    609: #ifdef ALTQ
                    610:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    611:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    612:                /* packet dropped by traffic conditioner */
                    613:                return;
                    614:        }
                    615: #endif
1.121     thorpej   616:
                    617:        /*
1.1       cgd       618:         * Process options and, if not destined for us,
                    619:         * ship it on.  ip_dooptions returns 1 when an
                    620:         * error was detected (causing an icmp message
                    621:         * to be sent and the original packet to be freed).
                    622:         */
                    623:        ip_nhops = 0;           /* for source routed packets */
                    624:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    625:                return;
1.1       cgd       626:
                    627:        /*
1.165     christos  628:         * Enable a consistency check between the destination address
                    629:         * and the arrival interface for a unicast packet (the RFC 1122
                    630:         * strong ES model) if IP forwarding is disabled and the packet
                    631:         * is not locally generated.
                    632:         *
                    633:         * XXX - Checking also should be disabled if the destination
                    634:         * address is ipnat'ed to a different interface.
                    635:         *
                    636:         * XXX - Checking is incompatible with IP aliases added
                    637:         * to the loopback interface instead of the interface where
                    638:         * the packets are received.
                    639:         *
                    640:         * XXX - We need to add a per ifaddr flag for this so that
                    641:         * we get finer grain control.
                    642:         */
                    643:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    644:            (m->m_pkthdr.rcvif != NULL) &&
                    645:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    646:
                    647:        /*
1.1       cgd       648:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    649:         *
                    650:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    651:         * The behavior here is to treat addresses on !IFF_UP interface
                    652:         * as not mine.
1.1       cgd       653:         */
1.100     itojun    654:        downmatch = 0;
1.140     matt      655:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    656:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  657:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    658:                                continue;
1.97      itojun    659:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    660:                                break;
1.100     itojun    661:                        else
                    662:                                downmatch++;
1.97      itojun    663:                }
                    664:        }
1.86      thorpej   665:        if (ia != NULL)
                    666:                goto ours;
1.57      tls       667:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      668:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    669:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    670:                                continue;
1.57      tls       671:                        ia = ifatoia(ifa);
1.35      mycroft   672:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    673:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   674:                            /*
                    675:                             * Look for all-0's host part (old broadcast addr),
                    676:                             * either for subnet or net.
                    677:                             */
                    678:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   679:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       680:                                goto ours;
1.57      tls       681:                        /*
                    682:                         * An interface with IP address zero accepts
                    683:                         * all packets that arrive on that interface.
                    684:                         */
                    685:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    686:                                goto ours;
1.1       cgd       687:                }
                    688:        }
1.18      mycroft   689:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   690:                struct in_multi *inm;
                    691: #ifdef MROUTING
                    692:                extern struct socket *ip_mrouter;
1.10      brezak    693:
1.147     matt      694:                if (M_READONLY(m)) {
1.10      brezak    695:                        if ((m = m_pullup(m, hlen)) == 0) {
                    696:                                ipstat.ips_toosmall++;
1.89      itojun    697:                                return;
1.10      brezak    698:                        }
                    699:                        ip = mtod(m, struct ip *);
                    700:                }
1.4       hpeyerl   701:
                    702:                if (ip_mrouter) {
                    703:                        /*
                    704:                         * If we are acting as a multicast router, all
                    705:                         * incoming multicast packets are passed to the
                    706:                         * kernel-level multicast forwarding function.
                    707:                         * The packet is returned (relatively) intact; if
                    708:                         * ip_mforward() returns a non-zero value, the packet
                    709:                         * must be discarded, else it may be accepted below.
                    710:                         *
                    711:                         * (The IP ident field is put in the same byte order
                    712:                         * as expected when ip_mforward() is called from
                    713:                         * ip_output().)
                    714:                         */
1.13      mycroft   715:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    716:                                ipstat.ips_cantforward++;
1.4       hpeyerl   717:                                m_freem(m);
1.89      itojun    718:                                return;
1.4       hpeyerl   719:                        }
                    720:
                    721:                        /*
                    722:                         * The process-level routing demon needs to receive
                    723:                         * all multicast IGMP packets, whether or not this
                    724:                         * host belongs to their destination groups.
                    725:                         */
                    726:                        if (ip->ip_p == IPPROTO_IGMP)
                    727:                                goto ours;
1.13      mycroft   728:                        ipstat.ips_forward++;
1.4       hpeyerl   729:                }
                    730: #endif
                    731:                /*
                    732:                 * See if we belong to the destination multicast group on the
                    733:                 * arrival interface.
                    734:                 */
                    735:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    736:                if (inm == NULL) {
1.13      mycroft   737:                        ipstat.ips_cantforward++;
1.4       hpeyerl   738:                        m_freem(m);
1.89      itojun    739:                        return;
1.4       hpeyerl   740:                }
                    741:                goto ours;
                    742:        }
1.19      mycroft   743:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   744:            in_nullhost(ip->ip_dst))
1.1       cgd       745:                goto ours;
                    746:
                    747:        /*
                    748:         * Not for us; forward if possible and desirable.
                    749:         */
                    750:        if (ipforwarding == 0) {
                    751:                ipstat.ips_cantforward++;
                    752:                m_freem(m);
1.100     itojun    753:        } else {
                    754:                /*
                    755:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    756:                 * and there's no IFF_UP interface that matches ip_dst,
                    757:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    758:                 * forwarding loop till TTL goes to 0.
                    759:                 */
                    760:                if (downmatch) {
                    761:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    762:                        ipstat.ips_cantforward++;
                    763:                        return;
                    764:                }
1.145     itojun    765: #ifdef IPSEC
                    766:                if (ipsec4_in_reject(m, NULL)) {
                    767:                        ipsecstat.in_polvio++;
                    768:                        goto bad;
                    769:                }
                    770: #endif
1.173     jonathan  771: #ifdef FAST_IPSEC
                    772:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    773:                s = splsoftnet();
                    774:                if (mtag != NULL) {
                    775:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    776:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    777:                } else {
                    778:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    779:                                                   IP_FORWARDING, &error);
                    780:                }
                    781:                if (sp == NULL) {       /* NB: can happen if error */
                    782:                        splx(s);
                    783:                        /*XXX error stat???*/
                    784:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    785:                        goto bad;
                    786:                }
                    787:
                    788:                /*
                    789:                 * Check security policy against packet attributes.
                    790:                 */
                    791:                error = ipsec_in_reject(sp, m);
                    792:                KEY_FREESP(&sp);
                    793:                splx(s);
                    794:                if (error) {
                    795:                        ipstat.ips_cantforward++;
                    796:                        goto bad;
                    797:                }
                    798: #endif /* FAST_IPSEC */
1.145     itojun    799:
1.169     itojun    800:                ip_forward(m, srcrt);
1.100     itojun    801:        }
1.89      itojun    802:        return;
1.1       cgd       803:
                    804: ours:
                    805:        /*
                    806:         * If offset or IP_MF are set, must reassemble.
                    807:         * Otherwise, nothing need be done.
                    808:         * (We could look in the reassembly queue to see
                    809:         * if the packet was previously fragmented,
                    810:         * but it's not worth the time; just let them time out.)
                    811:         */
1.155     itojun    812:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    813:                if (M_READONLY(m)) {
                    814:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    815:                                ipstat.ips_toosmall++;
                    816:                                goto bad;
                    817:                        }
                    818:                        ip = mtod(m, struct ip *);
                    819:                }
                    820:
1.1       cgd       821:                /*
                    822:                 * Look for queue of fragments
                    823:                 * of this datagram.
                    824:                 */
1.75      thorpej   825:                IPQ_LOCK();
1.140     matt      826:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       827:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   828:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    829:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       830:                            ip->ip_p == fp->ipq_p)
                    831:                                goto found;
                    832:                fp = 0;
                    833: found:
                    834:
                    835:                /*
                    836:                 * Adjust ip_len to not reflect header,
1.25      cgd       837:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       838:                 * convert offset of this to bytes.
                    839:                 */
1.155     itojun    840:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    841:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       842:                if (mff) {
1.16      cgd       843:                        /*
                    844:                         * Make sure that fragments have a data length
                    845:                         * that's a non-zero multiple of 8 bytes.
                    846:                         */
1.155     itojun    847:                        if (ntohs(ip->ip_len) == 0 ||
                    848:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       849:                                ipstat.ips_badfrags++;
1.75      thorpej   850:                                IPQ_UNLOCK();
1.16      cgd       851:                                goto bad;
                    852:                        }
                    853:                }
1.155     itojun    854:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       855:
                    856:                /*
                    857:                 * If datagram marked as having more fragments
                    858:                 * or if this is not the first fragment,
                    859:                 * attempt reassembly; if it succeeds, proceed.
                    860:                 */
1.155     itojun    861:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       862:                        ipstat.ips_fragments++;
1.72      thorpej   863:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       864:                        if (ipqe == NULL) {
                    865:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   866:                                IPQ_UNLOCK();
1.25      cgd       867:                                goto bad;
                    868:                        }
                    869:                        ipqe->ipqe_mff = mff;
1.50      thorpej   870:                        ipqe->ipqe_m = m;
1.25      cgd       871:                        ipqe->ipqe_ip = ip;
1.50      thorpej   872:                        m = ip_reass(ipqe, fp);
1.75      thorpej   873:                        if (m == 0) {
                    874:                                IPQ_UNLOCK();
1.89      itojun    875:                                return;
1.75      thorpej   876:                        }
1.13      mycroft   877:                        ipstat.ips_reassembled++;
1.50      thorpej   878:                        ip = mtod(m, struct ip *);
1.74      thorpej   879:                        hlen = ip->ip_hl << 2;
1.155     itojun    880:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       881:                } else
                    882:                        if (fp)
                    883:                                ip_freef(fp);
1.75      thorpej   884:                IPQ_UNLOCK();
1.79      mycroft   885:        }
1.128     itojun    886:
1.173     jonathan  887: #if defined(IPSEC)
1.128     itojun    888:        /*
                    889:         * enforce IPsec policy checking if we are seeing last header.
                    890:         * note that we do not visit this with protocols with pcb layer
                    891:         * code - like udp/tcp/raw ip.
                    892:         */
                    893:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    894:            ipsec4_in_reject(m, NULL)) {
                    895:                ipsecstat.in_polvio++;
                    896:                goto bad;
                    897:        }
                    898: #endif
1.173     jonathan  899: #if FAST_IPSEC
                    900:        /*
                    901:         * enforce IPsec policy checking if we are seeing last header.
                    902:         * note that we do not visit this with protocols with pcb layer
                    903:         * code - like udp/tcp/raw ip.
                    904:         */
                    905:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    906:                /*
                    907:                 * Check if the packet has already had IPsec processing
                    908:                 * done.  If so, then just pass it along.  This tag gets
                    909:                 * set during AH, ESP, etc. input handling, before the
                    910:                 * packet is returned to the ip input queue for delivery.
                    911:                 */
                    912:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    913:                s = splsoftnet();
                    914:                if (mtag != NULL) {
                    915:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    916:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    917:                } else {
                    918:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    919:                                                   IP_FORWARDING, &error);
                    920:                }
                    921:                if (sp != NULL) {
                    922:                        /*
                    923:                         * Check security policy against packet attributes.
                    924:                         */
                    925:                        error = ipsec_in_reject(sp, m);
                    926:                        KEY_FREESP(&sp);
                    927:                } else {
                    928:                        /* XXX error stat??? */
                    929:                        error = EINVAL;
                    930: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    931:                        goto bad;
                    932:                }
                    933:                splx(s);
                    934:                if (error)
                    935:                        goto bad;
                    936:        }
                    937: #endif /* FAST_IPSEC */
1.1       cgd       938:
                    939:        /*
                    940:         * Switch out to protocol's input routine.
                    941:         */
1.82      aidan     942: #if IFA_STATS
1.122     itojun    943:        if (ia && ip)
1.155     itojun    944:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     945: #endif
1.1       cgd       946:        ipstat.ips_delivered++;
1.89      itojun    947:     {
                    948:        int off = hlen, nh = ip->ip_p;
                    949:
                    950:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    951:        return;
                    952:     }
1.1       cgd       953: bad:
                    954:        m_freem(m);
1.135     thorpej   955:        return;
                    956:
                    957: badcsum:
                    958:        ipstat.ips_badsum++;
                    959:        m_freem(m);
1.1       cgd       960: }
                    961:
                    962: /*
                    963:  * Take incoming datagram fragment and try to
                    964:  * reassemble it into whole datagram.  If a chain for
                    965:  * reassembly of this datagram already exists, then it
                    966:  * is given as fp; otherwise have to make a chain.
                    967:  */
1.50      thorpej   968: struct mbuf *
1.25      cgd       969: ip_reass(ipqe, fp)
1.109     augustss  970:        struct ipqent *ipqe;
                    971:        struct ipq *fp;
1.1       cgd       972: {
1.109     augustss  973:        struct mbuf *m = ipqe->ipqe_m;
                    974:        struct ipqent *nq, *p, *q;
1.25      cgd       975:        struct ip *ip;
1.1       cgd       976:        struct mbuf *t;
1.25      cgd       977:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       978:        int i, next;
                    979:
1.75      thorpej   980:        IPQ_LOCK_CHECK();
                    981:
1.1       cgd       982:        /*
                    983:         * Presence of header sizes in mbufs
                    984:         * would confuse code below.
                    985:         */
                    986:        m->m_data += hlen;
                    987:        m->m_len -= hlen;
                    988:
                    989:        /*
                    990:         * If first fragment to arrive, create a reassembly queue.
                    991:         */
                    992:        if (fp == 0) {
1.131     itojun    993:                /*
                    994:                 * Enforce upper bound on number of fragmented packets
                    995:                 * for which we attempt reassembly;
                    996:                 * If maxfrag is 0, never accept fragments.
                    997:                 * If maxfrag is -1, accept all fragments without limitation.
                    998:                 */
                    999:                if (ip_maxfragpackets < 0)
                   1000:                        ;
                   1001:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1002:                        goto dropfrag;
                   1003:                ip_nfragpackets++;
1.50      thorpej  1004:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1005:                    M_FTABLE, M_NOWAIT);
                   1006:                if (fp == NULL)
1.1       cgd      1007:                        goto dropfrag;
1.25      cgd      1008:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd      1009:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1010:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1011:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1012:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1013:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1014:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1015:                p = NULL;
1.1       cgd      1016:                goto insert;
                   1017:        }
                   1018:
                   1019:        /*
                   1020:         * Find a segment which begins after this one does.
                   1021:         */
1.148     matt     1022:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1023:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1024:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1025:                        break;
                   1026:
                   1027:        /*
                   1028:         * If there is a preceding segment, it may provide some of
                   1029:         * our data already.  If so, drop the data from the incoming
                   1030:         * segment.  If it provides all of our data, drop us.
                   1031:         */
1.25      cgd      1032:        if (p != NULL) {
1.155     itojun   1033:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1034:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1035:                if (i > 0) {
1.155     itojun   1036:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1037:                                goto dropfrag;
1.50      thorpej  1038:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1039:                        ipqe->ipqe_ip->ip_off =
                   1040:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1041:                        ipqe->ipqe_ip->ip_len =
                   1042:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1043:                }
                   1044:        }
                   1045:
                   1046:        /*
                   1047:         * While we overlap succeeding segments trim them or,
                   1048:         * if they are completely covered, dequeue them.
                   1049:         */
1.155     itojun   1050:        for (; q != NULL &&
                   1051:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1052:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1053:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1054:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1055:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1056:                        q->ipqe_ip->ip_len =
                   1057:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1058:                        q->ipqe_ip->ip_off =
                   1059:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1060:                        m_adj(q->ipqe_m, i);
1.1       cgd      1061:                        break;
                   1062:                }
1.148     matt     1063:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1064:                m_freem(q->ipqe_m);
1.148     matt     1065:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1066:                pool_put(&ipqent_pool, q);
1.1       cgd      1067:        }
                   1068:
                   1069: insert:
                   1070:        /*
                   1071:         * Stick new segment in its place;
                   1072:         * check for complete reassembly.
                   1073:         */
1.25      cgd      1074:        if (p == NULL) {
1.148     matt     1075:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1076:        } else {
1.148     matt     1077:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1078:        }
1.1       cgd      1079:        next = 0;
1.148     matt     1080:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1081:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1082:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1083:                        return (0);
1.155     itojun   1084:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1085:        }
1.25      cgd      1086:        if (p->ipqe_mff)
1.1       cgd      1087:                return (0);
                   1088:
                   1089:        /*
1.41      thorpej  1090:         * Reassembly is complete.  Check for a bogus message size and
                   1091:         * concatenate fragments.
1.1       cgd      1092:         */
1.148     matt     1093:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1094:        ip = q->ipqe_ip;
1.41      thorpej  1095:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1096:                ipstat.ips_toolong++;
                   1097:                ip_freef(fp);
                   1098:                return (0);
                   1099:        }
1.50      thorpej  1100:        m = q->ipqe_m;
1.1       cgd      1101:        t = m->m_next;
                   1102:        m->m_next = 0;
                   1103:        m_cat(m, t);
1.148     matt     1104:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1105:        pool_put(&ipqent_pool, q);
1.25      cgd      1106:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1107:                t = q->ipqe_m;
1.148     matt     1108:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1109:                pool_put(&ipqent_pool, q);
1.1       cgd      1110:                m_cat(m, t);
                   1111:        }
                   1112:
                   1113:        /*
                   1114:         * Create header for new ip packet by
                   1115:         * modifying header of first packet;
                   1116:         * dequeue and discard fragment reassembly header.
                   1117:         * Make header visible.
                   1118:         */
1.155     itojun   1119:        ip->ip_len = htons(next);
1.25      cgd      1120:        ip->ip_src = fp->ipq_src;
                   1121:        ip->ip_dst = fp->ipq_dst;
                   1122:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1123:        FREE(fp, M_FTABLE);
1.131     itojun   1124:        ip_nfragpackets--;
1.1       cgd      1125:        m->m_len += (ip->ip_hl << 2);
                   1126:        m->m_data -= (ip->ip_hl << 2);
                   1127:        /* some debugging cruft by sklower, below, will go away soon */
                   1128:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1129:                int plen = 0;
1.50      thorpej  1130:                for (t = m; t; t = t->m_next)
                   1131:                        plen += t->m_len;
                   1132:                m->m_pkthdr.len = plen;
1.1       cgd      1133:        }
1.50      thorpej  1134:        return (m);
1.1       cgd      1135:
                   1136: dropfrag:
                   1137:        ipstat.ips_fragdropped++;
                   1138:        m_freem(m);
1.72      thorpej  1139:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1140:        return (0);
                   1141: }
                   1142:
                   1143: /*
                   1144:  * Free a fragment reassembly header and all
                   1145:  * associated datagrams.
                   1146:  */
1.8       mycroft  1147: void
1.1       cgd      1148: ip_freef(fp)
                   1149:        struct ipq *fp;
                   1150: {
1.109     augustss 1151:        struct ipqent *q, *p;
1.1       cgd      1152:
1.75      thorpej  1153:        IPQ_LOCK_CHECK();
                   1154:
1.148     matt     1155:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1156:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1157:                m_freem(q->ipqe_m);
1.148     matt     1158:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1159:                pool_put(&ipqent_pool, q);
1.1       cgd      1160:        }
1.25      cgd      1161:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1162:        FREE(fp, M_FTABLE);
1.131     itojun   1163:        ip_nfragpackets--;
1.1       cgd      1164: }
                   1165:
                   1166: /*
                   1167:  * IP timer processing;
                   1168:  * if a timer expires on a reassembly
                   1169:  * queue, discard it.
                   1170:  */
1.8       mycroft  1171: void
1.1       cgd      1172: ip_slowtimo()
                   1173: {
1.109     augustss 1174:        struct ipq *fp, *nfp;
1.24      mycroft  1175:        int s = splsoftnet();
1.1       cgd      1176:
1.75      thorpej  1177:        IPQ_LOCK();
1.140     matt     1178:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1179:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1180:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1181:                        ipstat.ips_fragtimeout++;
1.25      cgd      1182:                        ip_freef(fp);
1.1       cgd      1183:                }
                   1184:        }
1.131     itojun   1185:        /*
                   1186:         * If we are over the maximum number of fragments
                   1187:         * (due to the limit being lowered), drain off
                   1188:         * enough to get down to the new limit.
                   1189:         */
                   1190:        if (ip_maxfragpackets < 0)
                   1191:                ;
                   1192:        else {
1.140     matt     1193:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1194:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1195:        }
1.75      thorpej  1196:        IPQ_UNLOCK();
1.63      matt     1197: #ifdef GATEWAY
                   1198:        ipflow_slowtimo();
                   1199: #endif
1.1       cgd      1200:        splx(s);
                   1201: }
                   1202:
                   1203: /*
                   1204:  * Drain off all datagram fragments.
                   1205:  */
1.8       mycroft  1206: void
1.1       cgd      1207: ip_drain()
                   1208: {
                   1209:
1.75      thorpej  1210:        /*
                   1211:         * We may be called from a device's interrupt context.  If
                   1212:         * the ipq is already busy, just bail out now.
                   1213:         */
                   1214:        if (ipq_lock_try() == 0)
                   1215:                return;
                   1216:
1.140     matt     1217:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1218:                ipstat.ips_fragdropped++;
1.140     matt     1219:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1220:        }
1.75      thorpej  1221:
                   1222:        IPQ_UNLOCK();
1.1       cgd      1223: }
                   1224:
                   1225: /*
                   1226:  * Do option processing on a datagram,
                   1227:  * possibly discarding it if bad options are encountered,
                   1228:  * or forwarding it if source-routed.
                   1229:  * Returns 1 if packet has been forwarded/freed,
                   1230:  * 0 if the packet should be processed further.
                   1231:  */
1.8       mycroft  1232: int
1.1       cgd      1233: ip_dooptions(m)
                   1234:        struct mbuf *m;
                   1235: {
1.109     augustss 1236:        struct ip *ip = mtod(m, struct ip *);
                   1237:        u_char *cp, *cp0;
                   1238:        struct ip_timestamp *ipt;
                   1239:        struct in_ifaddr *ia;
1.1       cgd      1240:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1241:        struct in_addr dst;
1.1       cgd      1242:        n_time ntime;
                   1243:
1.13      mycroft  1244:        dst = ip->ip_dst;
1.1       cgd      1245:        cp = (u_char *)(ip + 1);
                   1246:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1247:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1248:                opt = cp[IPOPT_OPTVAL];
                   1249:                if (opt == IPOPT_EOL)
                   1250:                        break;
                   1251:                if (opt == IPOPT_NOP)
                   1252:                        optlen = 1;
                   1253:                else {
1.113     itojun   1254:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1255:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1256:                                goto bad;
                   1257:                        }
1.1       cgd      1258:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1259:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1260:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1261:                                goto bad;
                   1262:                        }
                   1263:                }
                   1264:                switch (opt) {
                   1265:
                   1266:                default:
                   1267:                        break;
                   1268:
                   1269:                /*
                   1270:                 * Source routing with record.
                   1271:                 * Find interface with current destination address.
                   1272:                 * If none on this machine then drop if strictly routed,
                   1273:                 * or do nothing if loosely routed.
                   1274:                 * Record interface address and bring up next address
                   1275:                 * component.  If strictly routed make sure next
                   1276:                 * address is on directly accessible net.
                   1277:                 */
                   1278:                case IPOPT_LSRR:
                   1279:                case IPOPT_SSRR:
1.47      cjs      1280:                        if (ip_allowsrcrt == 0) {
                   1281:                                type = ICMP_UNREACH;
                   1282:                                code = ICMP_UNREACH_NET_PROHIB;
                   1283:                                goto bad;
                   1284:                        }
1.114     itojun   1285:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1286:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1287:                                goto bad;
                   1288:                        }
1.1       cgd      1289:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1290:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1291:                                goto bad;
                   1292:                        }
                   1293:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1294:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1295:                        if (ia == 0) {
                   1296:                                if (opt == IPOPT_SSRR) {
                   1297:                                        type = ICMP_UNREACH;
                   1298:                                        code = ICMP_UNREACH_SRCFAIL;
                   1299:                                        goto bad;
                   1300:                                }
                   1301:                                /*
                   1302:                                 * Loose routing, and not at next destination
                   1303:                                 * yet; nothing to do except forward.
                   1304:                                 */
                   1305:                                break;
                   1306:                        }
                   1307:                        off--;                  /* 0 origin */
1.112     sommerfe 1308:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1309:                                /*
                   1310:                                 * End of source route.  Should be for us.
                   1311:                                 */
                   1312:                                save_rte(cp, ip->ip_src);
                   1313:                                break;
                   1314:                        }
                   1315:                        /*
                   1316:                         * locate outgoing interface
                   1317:                         */
                   1318:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1319:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1320:                        if (opt == IPOPT_SSRR)
                   1321:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1322:                        else
1.1       cgd      1323:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1324:                        if (ia == 0) {
                   1325:                                type = ICMP_UNREACH;
                   1326:                                code = ICMP_UNREACH_SRCFAIL;
                   1327:                                goto bad;
                   1328:                        }
                   1329:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1330:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1331:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1332:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1333:                        /*
                   1334:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1335:                         */
1.18      mycroft  1336:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1337:                        break;
                   1338:
                   1339:                case IPOPT_RR:
1.114     itojun   1340:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1341:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1342:                                goto bad;
                   1343:                        }
1.1       cgd      1344:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1345:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1346:                                goto bad;
                   1347:                        }
                   1348:                        /*
                   1349:                         * If no space remains, ignore.
                   1350:                         */
                   1351:                        off--;                  /* 0 origin */
1.112     sommerfe 1352:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1353:                                break;
                   1354:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1355:                            sizeof(ipaddr.sin_addr));
                   1356:                        /*
                   1357:                         * locate outgoing interface; if we're the destination,
                   1358:                         * use the incoming interface (should be same).
                   1359:                         */
1.96      thorpej  1360:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1361:                            == NULL &&
                   1362:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1363:                                type = ICMP_UNREACH;
                   1364:                                code = ICMP_UNREACH_HOST;
                   1365:                                goto bad;
                   1366:                        }
1.20      mycroft  1367:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1368:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1369:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1370:                        break;
                   1371:
                   1372:                case IPOPT_TS:
                   1373:                        code = cp - (u_char *)ip;
                   1374:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1375:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1376:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1377:                                goto bad;
1.114     itojun   1378:                        }
                   1379:                        if (ipt->ipt_ptr < 5) {
                   1380:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1381:                                goto bad;
                   1382:                        }
1.15      cgd      1383:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1384:                                if (++ipt->ipt_oflw == 0) {
                   1385:                                        code = (u_char *)&ipt->ipt_ptr -
                   1386:                                            (u_char *)ip;
1.1       cgd      1387:                                        goto bad;
1.114     itojun   1388:                                }
1.1       cgd      1389:                                break;
                   1390:                        }
1.104     thorpej  1391:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1392:                        switch (ipt->ipt_flg) {
                   1393:
                   1394:                        case IPOPT_TS_TSONLY:
                   1395:                                break;
                   1396:
                   1397:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1398:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1399:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1400:                                        code = (u_char *)&ipt->ipt_ptr -
                   1401:                                            (u_char *)ip;
1.1       cgd      1402:                                        goto bad;
1.114     itojun   1403:                                }
1.13      mycroft  1404:                                ipaddr.sin_addr = dst;
1.96      thorpej  1405:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1406:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1407:                                if (ia == 0)
                   1408:                                        continue;
1.104     thorpej  1409:                                bcopy(&ia->ia_addr.sin_addr,
                   1410:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1411:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1412:                                break;
                   1413:
                   1414:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1415:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1416:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1417:                                        code = (u_char *)&ipt->ipt_ptr -
                   1418:                                            (u_char *)ip;
1.1       cgd      1419:                                        goto bad;
1.114     itojun   1420:                                }
1.104     thorpej  1421:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1422:                                    sizeof(struct in_addr));
1.96      thorpej  1423:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1424:                                    == NULL)
1.1       cgd      1425:                                        continue;
                   1426:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1427:                                break;
                   1428:
                   1429:                        default:
1.114     itojun   1430:                                /* XXX can't take &ipt->ipt_flg */
                   1431:                                code = (u_char *)&ipt->ipt_ptr -
                   1432:                                    (u_char *)ip + 1;
1.1       cgd      1433:                                goto bad;
                   1434:                        }
                   1435:                        ntime = iptime();
1.107     thorpej  1436:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1437:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1438:                            sizeof(n_time));
                   1439:                        ipt->ipt_ptr += sizeof(n_time);
                   1440:                }
                   1441:        }
                   1442:        if (forward) {
1.26      thorpej  1443:                if (ip_forwsrcrt == 0) {
                   1444:                        type = ICMP_UNREACH;
                   1445:                        code = ICMP_UNREACH_SRCFAIL;
                   1446:                        goto bad;
                   1447:                }
1.1       cgd      1448:                ip_forward(m, 1);
                   1449:                return (1);
1.13      mycroft  1450:        }
                   1451:        return (0);
1.1       cgd      1452: bad:
1.13      mycroft  1453:        icmp_error(m, type, code, 0, 0);
                   1454:        ipstat.ips_badoptions++;
1.1       cgd      1455:        return (1);
                   1456: }
                   1457:
                   1458: /*
                   1459:  * Given address of next destination (final or next hop),
                   1460:  * return internet address info of interface to be used to get there.
                   1461:  */
                   1462: struct in_ifaddr *
                   1463: ip_rtaddr(dst)
                   1464:         struct in_addr dst;
                   1465: {
1.109     augustss 1466:        struct sockaddr_in *sin;
1.1       cgd      1467:
1.19      mycroft  1468:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1469:
1.35      mycroft  1470:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1471:                if (ipforward_rt.ro_rt) {
                   1472:                        RTFREE(ipforward_rt.ro_rt);
                   1473:                        ipforward_rt.ro_rt = 0;
                   1474:                }
                   1475:                sin->sin_family = AF_INET;
                   1476:                sin->sin_len = sizeof(*sin);
                   1477:                sin->sin_addr = dst;
                   1478:
                   1479:                rtalloc(&ipforward_rt);
                   1480:        }
                   1481:        if (ipforward_rt.ro_rt == 0)
                   1482:                return ((struct in_ifaddr *)0);
1.19      mycroft  1483:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1484: }
                   1485:
                   1486: /*
                   1487:  * Save incoming source route for use in replies,
                   1488:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1489:  */
1.13      mycroft  1490: void
1.1       cgd      1491: save_rte(option, dst)
                   1492:        u_char *option;
                   1493:        struct in_addr dst;
                   1494: {
                   1495:        unsigned olen;
                   1496:
                   1497:        olen = option[IPOPT_OLEN];
                   1498: #ifdef DIAGNOSTIC
                   1499:        if (ipprintfs)
1.39      christos 1500:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1501: #endif /* 0 */
1.1       cgd      1502:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1503:                return;
                   1504:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1505:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1506:        ip_srcrt.dst = dst;
                   1507: }
                   1508:
                   1509: /*
                   1510:  * Retrieve incoming source route for use in replies,
                   1511:  * in the same form used by setsockopt.
                   1512:  * The first hop is placed before the options, will be removed later.
                   1513:  */
                   1514: struct mbuf *
                   1515: ip_srcroute()
                   1516: {
1.109     augustss 1517:        struct in_addr *p, *q;
                   1518:        struct mbuf *m;
1.1       cgd      1519:
                   1520:        if (ip_nhops == 0)
                   1521:                return ((struct mbuf *)0);
                   1522:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1523:        if (m == 0)
                   1524:                return ((struct mbuf *)0);
                   1525:
1.164     matt     1526:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1527: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1528:
                   1529:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1530:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1531:            OPTSIZ;
                   1532: #ifdef DIAGNOSTIC
                   1533:        if (ipprintfs)
1.39      christos 1534:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1535: #endif
                   1536:
                   1537:        /*
                   1538:         * First save first hop for return route
                   1539:         */
                   1540:        p = &ip_srcrt.route[ip_nhops - 1];
                   1541:        *(mtod(m, struct in_addr *)) = *p--;
                   1542: #ifdef DIAGNOSTIC
                   1543:        if (ipprintfs)
1.39      christos 1544:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1545: #endif
                   1546:
                   1547:        /*
                   1548:         * Copy option fields and padding (nop) to mbuf.
                   1549:         */
                   1550:        ip_srcrt.nop = IPOPT_NOP;
                   1551:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1552:        bcopy((caddr_t)&ip_srcrt.nop,
                   1553:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1554:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1555:            sizeof(struct in_addr) + OPTSIZ);
                   1556: #undef OPTSIZ
                   1557:        /*
                   1558:         * Record return path as an IP source route,
                   1559:         * reversing the path (pointers are now aligned).
                   1560:         */
                   1561:        while (p >= ip_srcrt.route) {
                   1562: #ifdef DIAGNOSTIC
                   1563:                if (ipprintfs)
1.39      christos 1564:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1565: #endif
                   1566:                *q++ = *p--;
                   1567:        }
                   1568:        /*
                   1569:         * Last hop goes to final destination.
                   1570:         */
                   1571:        *q = ip_srcrt.dst;
                   1572: #ifdef DIAGNOSTIC
                   1573:        if (ipprintfs)
1.39      christos 1574:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1575: #endif
                   1576:        return (m);
                   1577: }
                   1578:
                   1579: /*
                   1580:  * Strip out IP options, at higher
                   1581:  * level protocol in the kernel.
                   1582:  * Second argument is buffer to which options
                   1583:  * will be moved, and return value is their length.
                   1584:  * XXX should be deleted; last arg currently ignored.
                   1585:  */
1.8       mycroft  1586: void
1.1       cgd      1587: ip_stripoptions(m, mopt)
1.109     augustss 1588:        struct mbuf *m;
1.1       cgd      1589:        struct mbuf *mopt;
                   1590: {
1.109     augustss 1591:        int i;
1.1       cgd      1592:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1593:        caddr_t opts;
1.1       cgd      1594:        int olen;
                   1595:
1.79      mycroft  1596:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1597:        opts = (caddr_t)(ip + 1);
                   1598:        i = m->m_len - (sizeof (struct ip) + olen);
                   1599:        bcopy(opts  + olen, opts, (unsigned)i);
                   1600:        m->m_len -= olen;
                   1601:        if (m->m_flags & M_PKTHDR)
                   1602:                m->m_pkthdr.len -= olen;
1.155     itojun   1603:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1604:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1605: }
                   1606:
1.139     matt     1607: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1608:        0,              0,              0,              0,
                   1609:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1610:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1611:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1612:        0,              0,              0,              0,
                   1613:        ENOPROTOOPT
                   1614: };
                   1615:
                   1616: /*
                   1617:  * Forward a packet.  If some error occurs return the sender
                   1618:  * an icmp packet.  Note we can't always generate a meaningful
                   1619:  * icmp message because icmp doesn't have a large enough repertoire
                   1620:  * of codes and types.
                   1621:  *
                   1622:  * If not forwarding, just drop the packet.  This could be confusing
                   1623:  * if ipforwarding was zero but some routing protocol was advancing
                   1624:  * us as a gateway to somewhere.  However, we must let the routing
                   1625:  * protocol deal with that.
                   1626:  *
                   1627:  * The srcrt parameter indicates whether the packet is being forwarded
                   1628:  * via a source route.
                   1629:  */
1.13      mycroft  1630: void
1.1       cgd      1631: ip_forward(m, srcrt)
                   1632:        struct mbuf *m;
                   1633:        int srcrt;
                   1634: {
1.109     augustss 1635:        struct ip *ip = mtod(m, struct ip *);
                   1636:        struct sockaddr_in *sin;
                   1637:        struct rtentry *rt;
1.28      christos 1638:        int error, type = 0, code = 0;
1.1       cgd      1639:        struct mbuf *mcopy;
1.13      mycroft  1640:        n_long dest;
                   1641:        struct ifnet *destifp;
1.173     jonathan 1642: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1643:        struct ifnet dummyifp;
                   1644: #endif
1.164     matt     1645:
                   1646:        /*
                   1647:         * We are now in the output path.
                   1648:         */
                   1649:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1650:
                   1651:        /*
                   1652:         * Clear any in-bound checksum flags for this packet.
                   1653:         */
                   1654:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1655:
1.13      mycroft  1656:        dest = 0;
1.1       cgd      1657: #ifdef DIAGNOSTIC
                   1658:        if (ipprintfs)
1.70      thorpej  1659:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1660:                    ntohl(ip->ip_src.s_addr),
                   1661:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1662: #endif
1.93      sommerfe 1663:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1664:                ipstat.ips_cantforward++;
                   1665:                m_freem(m);
                   1666:                return;
                   1667:        }
                   1668:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1669:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1670:                return;
                   1671:        }
                   1672:        ip->ip_ttl -= IPTTLDEC;
                   1673:
1.19      mycroft  1674:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1675:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1676:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1677:                if (ipforward_rt.ro_rt) {
                   1678:                        RTFREE(ipforward_rt.ro_rt);
                   1679:                        ipforward_rt.ro_rt = 0;
                   1680:                }
                   1681:                sin->sin_family = AF_INET;
1.35      mycroft  1682:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1683:                sin->sin_addr = ip->ip_dst;
                   1684:
                   1685:                rtalloc(&ipforward_rt);
                   1686:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1687:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1688:                        return;
                   1689:                }
                   1690:                rt = ipforward_rt.ro_rt;
                   1691:        }
                   1692:
                   1693:        /*
1.34      mycroft  1694:         * Save at most 68 bytes of the packet in case
1.1       cgd      1695:         * we need to generate an ICMP message to the src.
1.119     itojun   1696:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1697:         */
1.155     itojun   1698:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1699:        if (mcopy)
                   1700:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1701:
                   1702:        /*
                   1703:         * If forwarding packet using same interface that it came in on,
                   1704:         * perhaps should send a redirect to sender to shortcut a hop.
                   1705:         * Only send redirect if source is sending directly to us,
                   1706:         * and if packet was not source routed (or has any options).
                   1707:         * Also, don't send redirect if forwarding using a default route
                   1708:         * or a route modified by a redirect.
                   1709:         */
                   1710:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1711:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1712:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1713:            ipsendredirects && !srcrt) {
1.19      mycroft  1714:                if (rt->rt_ifa &&
                   1715:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1716:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1717:                        if (rt->rt_flags & RTF_GATEWAY)
                   1718:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1719:                        else
                   1720:                                dest = ip->ip_dst.s_addr;
                   1721:                        /*
                   1722:                         * Router requirements says to only send host
                   1723:                         * redirects.
                   1724:                         */
                   1725:                        type = ICMP_REDIRECT;
                   1726:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1727: #ifdef DIAGNOSTIC
1.77      thorpej  1728:                        if (ipprintfs)
                   1729:                                printf("redirect (%d) to %x\n", code,
                   1730:                                    (u_int32_t)dest);
1.1       cgd      1731: #endif
                   1732:                }
                   1733:        }
                   1734:
1.27      thorpej  1735:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1736:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1737:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1738:
1.1       cgd      1739:        if (error)
                   1740:                ipstat.ips_cantforward++;
                   1741:        else {
                   1742:                ipstat.ips_forward++;
                   1743:                if (type)
                   1744:                        ipstat.ips_redirectsent++;
                   1745:                else {
1.63      matt     1746:                        if (mcopy) {
                   1747: #ifdef GATEWAY
1.64      thorpej  1748:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1749:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1750: #endif
1.1       cgd      1751:                                m_freem(mcopy);
1.63      matt     1752:                        }
1.1       cgd      1753:                        return;
                   1754:                }
                   1755:        }
                   1756:        if (mcopy == NULL)
                   1757:                return;
1.13      mycroft  1758:        destifp = NULL;
                   1759:
1.1       cgd      1760:        switch (error) {
                   1761:
                   1762:        case 0:                         /* forwarded, but need redirect */
                   1763:                /* type, code set above */
                   1764:                break;
                   1765:
                   1766:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1767:        case EHOSTUNREACH:
                   1768:        case ENETDOWN:
                   1769:        case EHOSTDOWN:
                   1770:        default:
                   1771:                type = ICMP_UNREACH;
                   1772:                code = ICMP_UNREACH_HOST;
                   1773:                break;
                   1774:
                   1775:        case EMSGSIZE:
                   1776:                type = ICMP_UNREACH;
                   1777:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1778: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1779:                if (ipforward_rt.ro_rt)
                   1780:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1781: #else
                   1782:                /*
                   1783:                 * If the packet is routed over IPsec tunnel, tell the
                   1784:                 * originator the tunnel MTU.
                   1785:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1786:                 * XXX quickhack!!!
                   1787:                 */
                   1788:                if (ipforward_rt.ro_rt) {
                   1789:                        struct secpolicy *sp;
                   1790:                        int ipsecerror;
1.95      itojun   1791:                        size_t ipsechdr;
1.89      itojun   1792:                        struct route *ro;
                   1793:
                   1794:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1795:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1796:                            &ipsecerror);
1.89      itojun   1797:
                   1798:                        if (sp == NULL)
                   1799:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1800:                        else {
                   1801:                                /* count IPsec header size */
1.95      itojun   1802:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1803:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1804:
                   1805:                                /*
                   1806:                                 * find the correct route for outer IPv4
                   1807:                                 * header, compute tunnel MTU.
                   1808:                                 *
                   1809:                                 * XXX BUG ALERT
                   1810:                                 * The "dummyifp" code relies upon the fact
                   1811:                                 * that icmp_error() touches only ifp->if_mtu.
                   1812:                                 */
                   1813:                                /*XXX*/
                   1814:                                destifp = NULL;
                   1815:                                if (sp->req != NULL
1.95      itojun   1816:                                 && sp->req->sav != NULL
                   1817:                                 && sp->req->sav->sah != NULL) {
                   1818:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1819:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1820:                                                dummyifp.if_mtu =
1.151     itojun   1821:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1822:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1823:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1824:                                                dummyifp.if_mtu -= ipsechdr;
                   1825:                                                destifp = &dummyifp;
                   1826:                                        }
                   1827:                                }
                   1828:
1.173     jonathan 1829: #ifdef IPSEC
1.89      itojun   1830:                                key_freesp(sp);
1.173     jonathan 1831: #else
                   1832:                                KEY_FREESP(&sp);
                   1833: #endif
1.89      itojun   1834:                        }
                   1835:                }
                   1836: #endif /*IPSEC*/
1.1       cgd      1837:                ipstat.ips_cantfrag++;
                   1838:                break;
                   1839:
                   1840:        case ENOBUFS:
1.143     itojun   1841: #if 1
                   1842:                /*
                   1843:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1844:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1845:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1846:                 * or if the underlying interface is rate-limited.
1.143     itojun   1847:                 */
                   1848:                if (mcopy)
                   1849:                        m_freem(mcopy);
                   1850:                return;
                   1851: #else
1.1       cgd      1852:                type = ICMP_SOURCEQUENCH;
                   1853:                code = 0;
                   1854:                break;
1.143     itojun   1855: #endif
1.1       cgd      1856:        }
1.13      mycroft  1857:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1858: }
                   1859:
                   1860: void
                   1861: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1862:        struct inpcb *inp;
                   1863:        struct mbuf **mp;
                   1864:        struct ip *ip;
                   1865:        struct mbuf *m;
1.44      thorpej  1866: {
                   1867:
                   1868:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1869:                struct timeval tv;
                   1870:
                   1871:                microtime(&tv);
                   1872:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1873:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1874:                if (*mp)
                   1875:                        mp = &(*mp)->m_next;
                   1876:        }
                   1877:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1878:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1879:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1880:                if (*mp)
                   1881:                        mp = &(*mp)->m_next;
                   1882:        }
                   1883: #ifdef notyet
                   1884:        /*
                   1885:         * XXX
                   1886:         * Moving these out of udp_input() made them even more broken
                   1887:         * than they already were.
                   1888:         *      - fenner@parc.xerox.com
                   1889:         */
                   1890:        /* options were tossed already */
                   1891:        if (inp->inp_flags & INP_RECVOPTS) {
                   1892:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1893:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1894:                if (*mp)
                   1895:                        mp = &(*mp)->m_next;
                   1896:        }
                   1897:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1898:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1899:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1900:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1901:                if (*mp)
                   1902:                        mp = &(*mp)->m_next;
                   1903:        }
                   1904: #endif
                   1905:        if (inp->inp_flags & INP_RECVIF) {
                   1906:                struct sockaddr_dl sdl;
                   1907:
                   1908:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1909:                sdl.sdl_family = AF_LINK;
                   1910:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1911:                    m->m_pkthdr.rcvif->if_index : 0;
                   1912:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1913:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1914:                    IP_RECVIF, IPPROTO_IP);
                   1915:                if (*mp)
                   1916:                        mp = &(*mp)->m_next;
                   1917:        }
1.13      mycroft  1918: }
                   1919:
1.189   ! atatat   1920: /*
        !          1921:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
        !          1922:  * range of the new value and tweaks timers if it changes.
        !          1923:  */
        !          1924: static int
        !          1925: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1926: {
1.189   ! atatat   1927:        int error, tmp;
        !          1928:        struct sysctlnode node;
        !          1929:
        !          1930:        node = *rnode;
        !          1931:        tmp = ip_mtudisc_timeout;
        !          1932:        node.sysctl_data = &tmp;
        !          1933:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
        !          1934:        if (error || newp == NULL)
        !          1935:                return (error);
        !          1936:        if (tmp < 0)
        !          1937:                return (EINVAL);
1.52      thorpej  1938:
1.189   ! atatat   1939:        ip_mtudisc_timeout = tmp;
        !          1940:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
        !          1941:
        !          1942:        return (0);
        !          1943: }
1.54      lukem    1944:
1.65      matt     1945: #ifdef GATEWAY
1.189   ! atatat   1946: /*
        !          1947:  * sysctl helper routine for net.inet.ip.maxflows.  apparently if
        !          1948:  * maxflows is even looked up, we "reap flows".
        !          1949:  */
        !          1950: static int
        !          1951: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
        !          1952: {
        !          1953:        int s;
1.67      thorpej  1954:
1.189   ! atatat   1955:        s = sysctl_lookup(SYSCTLFN_CALL(rnode));
        !          1956:        if (s)
        !          1957:                return (s);
        !          1958:
        !          1959:        s = splsoftnet();
        !          1960:        ipflow_reap(0);
        !          1961:        splx(s);
1.144     martin   1962:
1.189   ! atatat   1963:        return (0);
        !          1964: }
        !          1965: #endif /* GATEWAY */
1.117     tron     1966:
1.131     itojun   1967:
1.189   ! atatat   1968: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
        !          1969: {
        !          1970:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 1971:
1.189   ! atatat   1972:        sysctl_createv(SYSCTL_PERMANENT,
        !          1973:                       CTLTYPE_NODE, "net", NULL,
        !          1974:                       NULL, 0, NULL, 0,
        !          1975:                       CTL_NET, CTL_EOL);
        !          1976:        sysctl_createv(SYSCTL_PERMANENT,
        !          1977:                       CTLTYPE_NODE, "inet", NULL,
        !          1978:                       NULL, 0, NULL, 0,
        !          1979:                       CTL_NET, PF_INET, CTL_EOL);
        !          1980:        sysctl_createv(SYSCTL_PERMANENT,
        !          1981:                       CTLTYPE_NODE, "ip", NULL,
        !          1982:                       NULL, 0, NULL, 0,
        !          1983:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
        !          1984:
        !          1985:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          1986:                       CTLTYPE_INT, "forwarding", NULL,
        !          1987:                       NULL, 0, &ipforwarding, 0,
        !          1988:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          1989:                       IPCTL_FORWARDING, CTL_EOL);
        !          1990:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          1991:                       CTLTYPE_INT, "redirect", NULL,
        !          1992:                       NULL, 0, &ipsendredirects, 0,
        !          1993:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          1994:                       IPCTL_SENDREDIRECTS, CTL_EOL);
        !          1995:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          1996:                       CTLTYPE_INT, "ttl", NULL,
        !          1997:                       NULL, 0, &ip_defttl, 0,
        !          1998:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          1999:                       IPCTL_DEFTTL, CTL_EOL);
        !          2000: #ifdef IPCTL_DEFMTU
        !          2001:        sysctl_createv(SYSCTL_PERMANENT /* |SYSCTL_READWRITE? */,
        !          2002:                       CTLTYPE_INT, "mtu", NULL,
        !          2003:                       NULL, 0, &ip_mtu, 0,
        !          2004:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2005:                       IPCTL_DEFMTU, CTL_EOL);
        !          2006: #endif /* IPCTL_DEFMTU */
        !          2007:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READONLY1,
        !          2008:                       CTLTYPE_INT, "forwsrcrt", NULL,
        !          2009:                       NULL, 0, &ip_forwsrcrt, 0,
        !          2010:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2011:                       IPCTL_FORWSRCRT, CTL_EOL);
        !          2012:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2013:                       CTLTYPE_INT, "directed-broadcast", NULL,
        !          2014:                       NULL, 0, &ip_directedbcast, 0,
        !          2015:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2016:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
        !          2017:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2018:                       CTLTYPE_INT, "allowsrcrt", NULL,
        !          2019:                       NULL, 0, &ip_allowsrcrt, 0,
        !          2020:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2021:                       IPCTL_ALLOWSRCRT, CTL_EOL);
        !          2022:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2023:                       CTLTYPE_INT, "subnetsarelocal", NULL,
        !          2024:                       NULL, 0, &subnetsarelocal, 0,
        !          2025:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2026:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
        !          2027:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2028:                       CTLTYPE_INT, "mtudisc", NULL,
        !          2029:                       NULL, 0, &ip_mtudisc, 0,
        !          2030:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2031:                       IPCTL_MTUDISC, CTL_EOL);
        !          2032:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2033:                       CTLTYPE_INT, "anonportmin", NULL,
        !          2034:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
        !          2035:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2036:                       IPCTL_ANONPORTMIN, CTL_EOL);
        !          2037:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2038:                       CTLTYPE_INT, "anonportmax", NULL,
        !          2039:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
        !          2040:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2041:                       IPCTL_ANONPORTMAX, CTL_EOL);
        !          2042:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2043:                       CTLTYPE_INT, "mtudisctimeout", NULL,
        !          2044:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
        !          2045:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2046:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
        !          2047: #ifdef GATEWAY
        !          2048:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2049:                       CTLTYPE_INT, "maxflows", NULL,
        !          2050:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
        !          2051:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2052:                       IPCTL_MAXFLOWS, CTL_EOL);
        !          2053: #endif /* GATEWAY */
        !          2054:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2055:                       CTLTYPE_INT, "hostzerobroadcast", NULL,
        !          2056:                       NULL, 0, &hostzeroisbroadcast, 0,
        !          2057:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2058:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
        !          2059: #if NGIF > 0
        !          2060:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2061:                       CTLTYPE_INT, "gifttl", NULL,
        !          2062:                       NULL, 0, &ip_gif_ttl, 0,
        !          2063:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2064:                       IPCTL_GIF_TTL, CTL_EOL);
        !          2065: #endif /* NGIF */
        !          2066: #ifndef IPNOPRIVPORTS
        !          2067:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2068:                       CTLTYPE_INT, "lowportmin", NULL,
        !          2069:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
        !          2070:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2071:                       IPCTL_LOWPORTMIN, CTL_EOL);
        !          2072:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2073:                       CTLTYPE_INT, "lowportmax", NULL,
        !          2074:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
        !          2075:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2076:                       IPCTL_LOWPORTMAX, CTL_EOL);
        !          2077: #endif /* IPNOPRIVPORTS */
        !          2078:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2079:                       CTLTYPE_INT, "maxfragpackets", NULL,
        !          2080:                       NULL, 0, &ip_maxfragpackets, 0,
        !          2081:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2082:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
        !          2083: #if NGRE > 0
        !          2084:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2085:                       CTLTYPE_INT, "grettl", NULL,
        !          2086:                       NULL, 0, &ip_gre_ttl, 0,
        !          2087:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2088:                       IPCTL_GRE_TTL, CTL_EOL);
        !          2089: #endif /* NGRE */
        !          2090:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2091:                       CTLTYPE_INT, "checkinterface", NULL,
        !          2092:                       NULL, 0, &ip_checkinterface, 0,
        !          2093:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2094:                       IPCTL_CHECKINTERFACE, CTL_EOL);
        !          2095:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
        !          2096:                       CTLTYPE_INT, "random_id", NULL,
        !          2097:                       NULL, 0, &ip_do_randomid, 0,
        !          2098:                       CTL_NET, PF_INET, IPPROTO_IP,
        !          2099:                       IPCTL_RANDOMID, CTL_EOL);
1.1       cgd      2100: }

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