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Annotation of src/sys/netinet/ip_input.c, Revision 1.183

1.183   ! jonathan    1: /*     $NetBSD: ip_input.c,v 1.182 2003/11/12 15:00:05 itojun 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>
1.183   ! jonathan  101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.182 2003/11/12 15:00:05 itojun Exp $");
1.55      scottr    102:
1.62      matt      103: #include "opt_gateway.h"
1.69      mrg       104: #include "opt_pfil_hooks.h"
1.91      thorpej   105: #include "opt_ipsec.h"
1.55      scottr    106: #include "opt_mrouting.h"
1.167     martin    107: #include "opt_mbuftrace.h"
1.135     thorpej   108: #include "opt_inet_csum.h"
1.1       cgd       109:
1.5       mycroft   110: #include <sys/param.h>
                    111: #include <sys/systm.h>
                    112: #include <sys/malloc.h>
                    113: #include <sys/mbuf.h>
                    114: #include <sys/domain.h>
                    115: #include <sys/protosw.h>
                    116: #include <sys/socket.h>
1.44      thorpej   117: #include <sys/socketvar.h>
1.5       mycroft   118: #include <sys/errno.h>
                    119: #include <sys/time.h>
                    120: #include <sys/kernel.h>
1.72      thorpej   121: #include <sys/pool.h>
1.28      christos  122: #include <sys/sysctl.h>
1.1       cgd       123:
1.5       mycroft   124: #include <net/if.h>
1.44      thorpej   125: #include <net/if_dl.h>
1.5       mycroft   126: #include <net/route.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
                    133: #include <netinet/in_var.h>
                    134: #include <netinet/ip_var.h>
                    135: #include <netinet/ip_icmp.h>
1.89      itojun    136: /* just for gif_ttl */
                    137: #include <netinet/in_gif.h>
                    138: #include "gif.h"
1.144     martin    139: #include <net/if_gre.h>
                    140: #include "gre.h"
1.111     jdolecek  141:
                    142: #ifdef MROUTING
                    143: #include <netinet/ip_mroute.h>
                    144: #endif
1.89      itojun    145:
                    146: #ifdef IPSEC
                    147: #include <netinet6/ipsec.h>
                    148: #include <netkey/key.h>
                    149: #endif
1.173     jonathan  150: #ifdef FAST_IPSEC
                    151: #include <netipsec/ipsec.h>
                    152: #include <netipsec/key.h>
                    153: #endif /* FAST_IPSEC*/
1.44      thorpej   154:
1.1       cgd       155: #ifndef        IPFORWARDING
                    156: #ifdef GATEWAY
                    157: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    158: #else /* GATEWAY */
                    159: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    160: #endif /* GATEWAY */
                    161: #endif /* IPFORWARDING */
                    162: #ifndef        IPSENDREDIRECTS
                    163: #define        IPSENDREDIRECTS 1
                    164: #endif
1.26      thorpej   165: #ifndef IPFORWSRCRT
1.47      cjs       166: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    167: #endif
                    168: #ifndef IPALLOWSRCRT
1.48      mrg       169: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   170: #endif
1.53      kml       171: #ifndef IPMTUDISC
1.153     itojun    172: #define IPMTUDISC      1
1.53      kml       173: #endif
1.60      kml       174: #ifndef IPMTUDISCTIMEOUT
1.61      kml       175: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       176: #endif
1.53      kml       177:
1.27      thorpej   178: /*
                    179:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    180:  * configuration using this option will Just Work.
                    181:  */
                    182: #ifndef IPDIRECTEDBCAST
                    183: #ifdef DIRECTED_BROADCAST
                    184: #define IPDIRECTEDBCAST        1
                    185: #else
                    186: #define        IPDIRECTEDBCAST 0
                    187: #endif /* DIRECTED_BROADCAST */
                    188: #endif /* IPDIRECTEDBCAST */
1.1       cgd       189: int    ipforwarding = IPFORWARDING;
                    190: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   191: int    ip_defttl = IPDEFTTL;
1.26      thorpej   192: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   193: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       194: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       195: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    196: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       197: #ifdef DIAGNOSTIC
                    198: int    ipprintfs = 0;
                    199: #endif
1.165     christos  200: /*
                    201:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    202:  * the Strong ES model described in RFC 1122, but since the routing table
                    203:  * and transmit implementation do not implement the Strong ES model,
                    204:  * setting this to 1 results in an odd hybrid.
                    205:  *
                    206:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    207:  * to translate the destination address to another local interface.
                    208:  *
                    209:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    210:  * to the loopback interface instead of the interface where the
                    211:  * packets for those addresses are received.
                    212:  */
                    213: int    ip_checkinterface = 0;
                    214:
1.1       cgd       215:
1.60      kml       216: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    217:
1.1       cgd       218: extern struct domain inetdomain;
                    219: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      220: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    221: int    in_ifaddrentries;                       /* total number of addrs */
1.181     jonathan  222: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       223: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      224: u_long in_multihash;                           /* size of hash table - 1 */
                    225: int    in_multientries;                        /* total number of addrs */
                    226: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   227: struct ifqueue ipintrq;
1.63      matt      228: struct ipstat  ipstat;
1.183   ! jonathan  229: uint16_t ip_id;
1.75      thorpej   230:
1.121     thorpej   231: #ifdef PFIL_HOOKS
                    232: struct pfil_head inet_pfil_hook;
                    233: #endif
                    234:
1.63      matt      235: struct ipqhead ipq;
1.75      thorpej   236: int    ipq_locked;
1.131     itojun    237: int    ip_nfragpackets = 0;
1.133     itojun    238: int    ip_maxfragpackets = 200;
1.75      thorpej   239:
                    240: static __inline int ipq_lock_try __P((void));
                    241: static __inline void ipq_unlock __P((void));
                    242:
                    243: static __inline int
                    244: ipq_lock_try()
                    245: {
                    246:        int s;
                    247:
1.132     thorpej   248:        /*
1.149     wiz       249:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   250:         * mbuf allocation.
                    251:         */
                    252:        s = splvm();
1.75      thorpej   253:        if (ipq_locked) {
                    254:                splx(s);
                    255:                return (0);
                    256:        }
                    257:        ipq_locked = 1;
                    258:        splx(s);
                    259:        return (1);
                    260: }
                    261:
                    262: static __inline void
                    263: ipq_unlock()
                    264: {
                    265:        int s;
                    266:
1.132     thorpej   267:        s = splvm();
1.75      thorpej   268:        ipq_locked = 0;
                    269:        splx(s);
                    270: }
                    271:
                    272: #ifdef DIAGNOSTIC
                    273: #define        IPQ_LOCK()                                                      \
                    274: do {                                                                   \
                    275:        if (ipq_lock_try() == 0) {                                      \
                    276:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    277:                panic("ipq_lock");                                      \
                    278:        }                                                               \
1.159     perry     279: } while (/*CONSTCOND*/ 0)
1.75      thorpej   280: #define        IPQ_LOCK_CHECK()                                                \
                    281: do {                                                                   \
                    282:        if (ipq_locked == 0) {                                          \
                    283:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    284:                panic("ipq lock check");                                \
                    285:        }                                                               \
1.159     perry     286: } while (/*CONSTCOND*/ 0)
1.75      thorpej   287: #else
                    288: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    289: #define        IPQ_LOCK_CHECK()        /* nothing */
                    290: #endif
                    291:
                    292: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       293:
1.166     matt      294: struct pool inmulti_pool;
1.72      thorpej   295: struct pool ipqent_pool;
                    296:
1.135     thorpej   297: #ifdef INET_CSUM_COUNTERS
                    298: #include <sys/device.h>
                    299:
                    300: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    301:     NULL, "inet", "hwcsum bad");
                    302: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    303:     NULL, "inet", "hwcsum ok");
                    304: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    305:     NULL, "inet", "swcsum");
                    306:
                    307: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    308:
                    309: #else
                    310:
                    311: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    312:
                    313: #endif /* INET_CSUM_COUNTERS */
                    314:
1.1       cgd       315: /*
                    316:  * We need to save the IP options in case a protocol wants to respond
                    317:  * to an incoming packet over the same route if the packet got here
                    318:  * using IP source routing.  This allows connection establishment and
                    319:  * maintenance when the remote end is on a network that is not known
                    320:  * to us.
                    321:  */
                    322: int    ip_nhops = 0;
                    323: static struct ip_srcrt {
                    324:        struct  in_addr dst;                    /* final destination */
                    325:        char    nop;                            /* one NOP to align */
                    326:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    327:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    328: } ip_srcrt;
                    329:
1.13      mycroft   330: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   331:
1.164     matt      332: #ifdef MBUFTRACE
                    333: struct mowner ip_rx_mowner = { "internet", "rx" };
                    334: struct mowner ip_tx_mowner = { "internet", "tx" };
                    335: #endif
                    336:
1.1       cgd       337: /*
                    338:  * IP initialization: fill in IP protocol switch table.
                    339:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    340:  */
1.8       mycroft   341: void
1.1       cgd       342: ip_init()
                    343: {
1.109     augustss  344:        struct protosw *pr;
                    345:        int i;
1.1       cgd       346:
1.166     matt      347:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    348:            NULL);
1.72      thorpej   349:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   350:            NULL);
1.72      thorpej   351:
1.1       cgd       352:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    353:        if (pr == 0)
                    354:                panic("ip_init");
                    355:        for (i = 0; i < IPPROTO_MAX; i++)
                    356:                ip_protox[i] = pr - inetsw;
                    357:        for (pr = inetdomain.dom_protosw;
                    358:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    359:                if (pr->pr_domain->dom_family == PF_INET &&
                    360:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    361:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       362:        LIST_INIT(&ipq);
1.183   ! jonathan  363:        ip_id = time.tv_sec & 0xfffff;
1.1       cgd       364:        ipintrq.ifq_maxlen = ipqmaxlen;
1.181     jonathan  365:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        366:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    367:            M_WAITOK, &in_ifaddrhash);
1.166     matt      368:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    369:            M_WAITOK, &in_multihash);
1.160     itojun    370:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   371: #ifdef GATEWAY
                    372:        ipflow_init();
                    373: #endif
1.121     thorpej   374:
                    375: #ifdef PFIL_HOOKS
                    376:        /* Register our Packet Filter hook. */
1.126     thorpej   377:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    378:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   379:        i = pfil_head_register(&inet_pfil_hook);
                    380:        if (i != 0)
                    381:                printf("ip_init: WARNING: unable to register pfil hook, "
                    382:                    "error %d\n", i);
                    383: #endif /* PFIL_HOOKS */
1.135     thorpej   384:
                    385: #ifdef INET_CSUM_COUNTERS
                    386:        evcnt_attach_static(&ip_hwcsum_bad);
                    387:        evcnt_attach_static(&ip_hwcsum_ok);
                    388:        evcnt_attach_static(&ip_swcsum);
                    389: #endif /* INET_CSUM_COUNTERS */
1.164     matt      390:
                    391: #ifdef MBUFTRACE
                    392:        MOWNER_ATTACH(&ip_tx_mowner);
                    393:        MOWNER_ATTACH(&ip_rx_mowner);
                    394: #endif /* MBUFTRACE */
1.1       cgd       395: }
                    396:
                    397: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    398: struct route ipforward_rt;
                    399:
                    400: /*
1.89      itojun    401:  * IP software interrupt routine
                    402:  */
                    403: void
                    404: ipintr()
                    405: {
                    406:        int s;
                    407:        struct mbuf *m;
                    408:
                    409:        while (1) {
1.132     thorpej   410:                s = splnet();
1.89      itojun    411:                IF_DEQUEUE(&ipintrq, m);
                    412:                splx(s);
                    413:                if (m == 0)
                    414:                        return;
1.164     matt      415:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    416:                ip_input(m);
                    417:        }
                    418: }
                    419:
                    420: /*
1.1       cgd       421:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    422:  * try to reassemble.  Process options.  Pass to next level.
                    423:  */
1.8       mycroft   424: void
1.89      itojun    425: ip_input(struct mbuf *m)
1.1       cgd       426: {
1.109     augustss  427:        struct ip *ip = NULL;
                    428:        struct ipq *fp;
                    429:        struct in_ifaddr *ia;
                    430:        struct ifaddr *ifa;
1.25      cgd       431:        struct ipqent *ipqe;
1.89      itojun    432:        int hlen = 0, mff, len;
1.100     itojun    433:        int downmatch;
1.165     christos  434:        int checkif;
1.169     itojun    435:        int srcrt = 0;
1.173     jonathan  436: #ifdef FAST_IPSEC
                    437:        struct m_tag *mtag;
                    438:        struct tdb_ident *tdbi;
                    439:        struct secpolicy *sp;
                    440:        int s, error;
                    441: #endif /* FAST_IPSEC */
1.1       cgd       442:
1.164     matt      443:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       444: #ifdef DIAGNOSTIC
                    445:        if ((m->m_flags & M_PKTHDR) == 0)
                    446:                panic("ipintr no HDR");
1.89      itojun    447: #endif
1.164     matt      448:
1.1       cgd       449:        /*
                    450:         * If no IP addresses have been set yet but the interfaces
                    451:         * are receiving, can't do anything with incoming packets yet.
                    452:         */
1.181     jonathan  453:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       454:                goto bad;
                    455:        ipstat.ips_total++;
1.154     thorpej   456:        /*
                    457:         * If the IP header is not aligned, slurp it up into a new
                    458:         * mbuf with space for link headers, in the event we forward
                    459:         * it.  Otherwise, if it is aligned, make sure the entire
                    460:         * base IP header is in the first mbuf of the chain.
                    461:         */
                    462:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    463:                if ((m = m_copyup(m, sizeof(struct ip),
                    464:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    465:                        /* XXXJRT new stat, please */
                    466:                        ipstat.ips_toosmall++;
                    467:                        return;
                    468:                }
                    469:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    470:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    471:                        ipstat.ips_toosmall++;
                    472:                        return;
                    473:                }
1.1       cgd       474:        }
                    475:        ip = mtod(m, struct ip *);
1.13      mycroft   476:        if (ip->ip_v != IPVERSION) {
                    477:                ipstat.ips_badvers++;
                    478:                goto bad;
                    479:        }
1.1       cgd       480:        hlen = ip->ip_hl << 2;
                    481:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    482:                ipstat.ips_badhlen++;
                    483:                goto bad;
                    484:        }
                    485:        if (hlen > m->m_len) {
                    486:                if ((m = m_pullup(m, hlen)) == 0) {
                    487:                        ipstat.ips_badhlen++;
1.89      itojun    488:                        return;
1.1       cgd       489:                }
                    490:                ip = mtod(m, struct ip *);
                    491:        }
1.98      thorpej   492:
1.85      hwr       493:        /*
1.99      thorpej   494:         * RFC1122: packets with a multicast source address are
1.98      thorpej   495:         * not allowed.
1.85      hwr       496:         */
                    497:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    498:                ipstat.ips_badaddr++;
1.85      hwr       499:                goto bad;
1.129     itojun    500:        }
                    501:
                    502:        /* 127/8 must not appear on wire - RFC1122 */
                    503:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    504:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    505:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    506:                        ipstat.ips_badaddr++;
1.129     itojun    507:                        goto bad;
1.130     itojun    508:                }
1.85      hwr       509:        }
                    510:
1.135     thorpej   511:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   512:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   513:                 M_CSUM_IPv4_BAD)) {
                    514:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    515:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    516:                goto badcsum;
                    517:
                    518:        case M_CSUM_IPv4:
                    519:                /* Checksum was okay. */
                    520:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    521:                break;
                    522:
                    523:        default:
                    524:                /* Must compute it ourselves. */
                    525:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    526:                if (in_cksum(m, hlen) != 0)
                    527:                        goto bad;
                    528:                break;
1.1       cgd       529:        }
                    530:
1.121     thorpej   531:        /* Retrieve the packet length. */
                    532:        len = ntohs(ip->ip_len);
1.81      proff     533:
                    534:        /*
                    535:         * Check for additional length bogosity
                    536:         */
1.84      proff     537:        if (len < hlen) {
1.81      proff     538:                ipstat.ips_badlen++;
                    539:                goto bad;
                    540:        }
1.1       cgd       541:
                    542:        /*
                    543:         * Check that the amount of data in the buffers
                    544:         * is as at least much as the IP header would have us expect.
                    545:         * Trim mbufs if longer than we expect.
                    546:         * Drop packet if shorter than we expect.
                    547:         */
1.35      mycroft   548:        if (m->m_pkthdr.len < len) {
1.1       cgd       549:                ipstat.ips_tooshort++;
                    550:                goto bad;
                    551:        }
1.35      mycroft   552:        if (m->m_pkthdr.len > len) {
1.1       cgd       553:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   554:                        m->m_len = len;
                    555:                        m->m_pkthdr.len = len;
1.1       cgd       556:                } else
1.35      mycroft   557:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       558:        }
                    559:
1.94      itojun    560: #ifdef IPSEC
1.149     wiz       561:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    562:        m->m_flags &= ~M_CANFASTFWD;
                    563: #else
1.64      thorpej   564:        /*
                    565:         * Assume that we can create a fast-forward IP flow entry
                    566:         * based on this packet.
                    567:         */
                    568:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    569: #endif
1.64      thorpej   570:
1.36      mrg       571: #ifdef PFIL_HOOKS
1.33      mrg       572:        /*
1.64      thorpej   573:         * Run through list of hooks for input packets.  If there are any
                    574:         * filters which require that additional packets in the flow are
                    575:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    576:         * Note that filters must _never_ set this flag, as another filter
                    577:         * in the list may have previously cleared it.
1.33      mrg       578:         */
1.127     itojun    579:        /*
                    580:         * let ipfilter look at packet on the wire,
                    581:         * not the decapsulated packet.
                    582:         */
                    583: #ifdef IPSEC
1.136     itojun    584:        if (!ipsec_getnhist(m))
1.127     itojun    585: #else
                    586:        if (1)
                    587: #endif
                    588:        {
1.169     itojun    589:                struct in_addr odst;
                    590:
                    591:                odst = ip->ip_dst;
1.127     itojun    592:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    593:                    PFIL_IN) != 0)
                    594:                        return;
1.127     itojun    595:                if (m == NULL)
                    596:                        return;
                    597:                ip = mtod(m, struct ip *);
1.142     darrenr   598:                hlen = ip->ip_hl << 2;
1.169     itojun    599:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    600:        }
1.36      mrg       601: #endif /* PFIL_HOOKS */
1.123     thorpej   602:
                    603: #ifdef ALTQ
                    604:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    605:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    606:                /* packet dropped by traffic conditioner */
                    607:                return;
                    608:        }
                    609: #endif
1.121     thorpej   610:
                    611:        /*
1.1       cgd       612:         * Process options and, if not destined for us,
                    613:         * ship it on.  ip_dooptions returns 1 when an
                    614:         * error was detected (causing an icmp message
                    615:         * to be sent and the original packet to be freed).
                    616:         */
                    617:        ip_nhops = 0;           /* for source routed packets */
                    618:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    619:                return;
1.1       cgd       620:
                    621:        /*
1.165     christos  622:         * Enable a consistency check between the destination address
                    623:         * and the arrival interface for a unicast packet (the RFC 1122
                    624:         * strong ES model) if IP forwarding is disabled and the packet
                    625:         * is not locally generated.
                    626:         *
                    627:         * XXX - Checking also should be disabled if the destination
                    628:         * address is ipnat'ed to a different interface.
                    629:         *
                    630:         * XXX - Checking is incompatible with IP aliases added
                    631:         * to the loopback interface instead of the interface where
                    632:         * the packets are received.
                    633:         *
                    634:         * XXX - We need to add a per ifaddr flag for this so that
                    635:         * we get finer grain control.
                    636:         */
                    637:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    638:            (m->m_pkthdr.rcvif != NULL) &&
                    639:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    640:
                    641:        /*
1.1       cgd       642:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    643:         *
                    644:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    645:         * The behavior here is to treat addresses on !IFF_UP interface
                    646:         * as not mine.
1.1       cgd       647:         */
1.100     itojun    648:        downmatch = 0;
1.140     matt      649:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    650:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  651:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    652:                                continue;
1.97      itojun    653:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    654:                                break;
1.100     itojun    655:                        else
                    656:                                downmatch++;
1.97      itojun    657:                }
                    658:        }
1.86      thorpej   659:        if (ia != NULL)
                    660:                goto ours;
1.57      tls       661:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      662:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    663:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    664:                                continue;
1.57      tls       665:                        ia = ifatoia(ifa);
1.35      mycroft   666:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    667:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   668:                            /*
                    669:                             * Look for all-0's host part (old broadcast addr),
                    670:                             * either for subnet or net.
                    671:                             */
                    672:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   673:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       674:                                goto ours;
1.57      tls       675:                        /*
                    676:                         * An interface with IP address zero accepts
                    677:                         * all packets that arrive on that interface.
                    678:                         */
                    679:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    680:                                goto ours;
1.1       cgd       681:                }
                    682:        }
1.18      mycroft   683:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   684:                struct in_multi *inm;
                    685: #ifdef MROUTING
                    686:                extern struct socket *ip_mrouter;
1.10      brezak    687:
1.147     matt      688:                if (M_READONLY(m)) {
1.10      brezak    689:                        if ((m = m_pullup(m, hlen)) == 0) {
                    690:                                ipstat.ips_toosmall++;
1.89      itojun    691:                                return;
1.10      brezak    692:                        }
                    693:                        ip = mtod(m, struct ip *);
                    694:                }
1.4       hpeyerl   695:
                    696:                if (ip_mrouter) {
                    697:                        /*
                    698:                         * If we are acting as a multicast router, all
                    699:                         * incoming multicast packets are passed to the
                    700:                         * kernel-level multicast forwarding function.
                    701:                         * The packet is returned (relatively) intact; if
                    702:                         * ip_mforward() returns a non-zero value, the packet
                    703:                         * must be discarded, else it may be accepted below.
                    704:                         *
                    705:                         * (The IP ident field is put in the same byte order
                    706:                         * as expected when ip_mforward() is called from
                    707:                         * ip_output().)
                    708:                         */
1.13      mycroft   709:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    710:                                ipstat.ips_cantforward++;
1.4       hpeyerl   711:                                m_freem(m);
1.89      itojun    712:                                return;
1.4       hpeyerl   713:                        }
                    714:
                    715:                        /*
                    716:                         * The process-level routing demon needs to receive
                    717:                         * all multicast IGMP packets, whether or not this
                    718:                         * host belongs to their destination groups.
                    719:                         */
                    720:                        if (ip->ip_p == IPPROTO_IGMP)
                    721:                                goto ours;
1.13      mycroft   722:                        ipstat.ips_forward++;
1.4       hpeyerl   723:                }
                    724: #endif
                    725:                /*
                    726:                 * See if we belong to the destination multicast group on the
                    727:                 * arrival interface.
                    728:                 */
                    729:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    730:                if (inm == NULL) {
1.13      mycroft   731:                        ipstat.ips_cantforward++;
1.4       hpeyerl   732:                        m_freem(m);
1.89      itojun    733:                        return;
1.4       hpeyerl   734:                }
                    735:                goto ours;
                    736:        }
1.19      mycroft   737:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   738:            in_nullhost(ip->ip_dst))
1.1       cgd       739:                goto ours;
                    740:
                    741:        /*
                    742:         * Not for us; forward if possible and desirable.
                    743:         */
                    744:        if (ipforwarding == 0) {
                    745:                ipstat.ips_cantforward++;
                    746:                m_freem(m);
1.100     itojun    747:        } else {
                    748:                /*
                    749:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    750:                 * and there's no IFF_UP interface that matches ip_dst,
                    751:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    752:                 * forwarding loop till TTL goes to 0.
                    753:                 */
                    754:                if (downmatch) {
                    755:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    756:                        ipstat.ips_cantforward++;
                    757:                        return;
                    758:                }
1.145     itojun    759: #ifdef IPSEC
                    760:                if (ipsec4_in_reject(m, NULL)) {
                    761:                        ipsecstat.in_polvio++;
                    762:                        goto bad;
                    763:                }
                    764: #endif
1.173     jonathan  765: #ifdef FAST_IPSEC
                    766:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    767:                s = splsoftnet();
                    768:                if (mtag != NULL) {
                    769:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    770:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    771:                } else {
                    772:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    773:                                                   IP_FORWARDING, &error);
                    774:                }
                    775:                if (sp == NULL) {       /* NB: can happen if error */
                    776:                        splx(s);
                    777:                        /*XXX error stat???*/
                    778:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    779:                        goto bad;
                    780:                }
                    781:
                    782:                /*
                    783:                 * Check security policy against packet attributes.
                    784:                 */
                    785:                error = ipsec_in_reject(sp, m);
                    786:                KEY_FREESP(&sp);
                    787:                splx(s);
                    788:                if (error) {
                    789:                        ipstat.ips_cantforward++;
                    790:                        goto bad;
                    791:                }
                    792: #endif /* FAST_IPSEC */
1.145     itojun    793:
1.169     itojun    794:                ip_forward(m, srcrt);
1.100     itojun    795:        }
1.89      itojun    796:        return;
1.1       cgd       797:
                    798: ours:
                    799:        /*
                    800:         * If offset or IP_MF are set, must reassemble.
                    801:         * Otherwise, nothing need be done.
                    802:         * (We could look in the reassembly queue to see
                    803:         * if the packet was previously fragmented,
                    804:         * but it's not worth the time; just let them time out.)
                    805:         */
1.155     itojun    806:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    807:                if (M_READONLY(m)) {
                    808:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    809:                                ipstat.ips_toosmall++;
                    810:                                goto bad;
                    811:                        }
                    812:                        ip = mtod(m, struct ip *);
                    813:                }
                    814:
1.1       cgd       815:                /*
                    816:                 * Look for queue of fragments
                    817:                 * of this datagram.
                    818:                 */
1.75      thorpej   819:                IPQ_LOCK();
1.140     matt      820:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       821:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   822:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    823:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       824:                            ip->ip_p == fp->ipq_p)
                    825:                                goto found;
                    826:                fp = 0;
                    827: found:
                    828:
                    829:                /*
                    830:                 * Adjust ip_len to not reflect header,
1.25      cgd       831:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       832:                 * convert offset of this to bytes.
                    833:                 */
1.155     itojun    834:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    835:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       836:                if (mff) {
1.16      cgd       837:                        /*
                    838:                         * Make sure that fragments have a data length
                    839:                         * that's a non-zero multiple of 8 bytes.
                    840:                         */
1.155     itojun    841:                        if (ntohs(ip->ip_len) == 0 ||
                    842:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       843:                                ipstat.ips_badfrags++;
1.75      thorpej   844:                                IPQ_UNLOCK();
1.16      cgd       845:                                goto bad;
                    846:                        }
                    847:                }
1.155     itojun    848:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       849:
                    850:                /*
                    851:                 * If datagram marked as having more fragments
                    852:                 * or if this is not the first fragment,
                    853:                 * attempt reassembly; if it succeeds, proceed.
                    854:                 */
1.155     itojun    855:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       856:                        ipstat.ips_fragments++;
1.72      thorpej   857:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       858:                        if (ipqe == NULL) {
                    859:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   860:                                IPQ_UNLOCK();
1.25      cgd       861:                                goto bad;
                    862:                        }
                    863:                        ipqe->ipqe_mff = mff;
1.50      thorpej   864:                        ipqe->ipqe_m = m;
1.25      cgd       865:                        ipqe->ipqe_ip = ip;
1.50      thorpej   866:                        m = ip_reass(ipqe, fp);
1.75      thorpej   867:                        if (m == 0) {
                    868:                                IPQ_UNLOCK();
1.89      itojun    869:                                return;
1.75      thorpej   870:                        }
1.13      mycroft   871:                        ipstat.ips_reassembled++;
1.50      thorpej   872:                        ip = mtod(m, struct ip *);
1.74      thorpej   873:                        hlen = ip->ip_hl << 2;
1.155     itojun    874:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       875:                } else
                    876:                        if (fp)
                    877:                                ip_freef(fp);
1.75      thorpej   878:                IPQ_UNLOCK();
1.79      mycroft   879:        }
1.128     itojun    880:
1.173     jonathan  881: #if defined(IPSEC)
1.128     itojun    882:        /*
                    883:         * enforce IPsec policy checking if we are seeing last header.
                    884:         * note that we do not visit this with protocols with pcb layer
                    885:         * code - like udp/tcp/raw ip.
                    886:         */
                    887:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    888:            ipsec4_in_reject(m, NULL)) {
                    889:                ipsecstat.in_polvio++;
                    890:                goto bad;
                    891:        }
                    892: #endif
1.173     jonathan  893: #if FAST_IPSEC
                    894:        /*
                    895:         * enforce IPsec policy checking if we are seeing last header.
                    896:         * note that we do not visit this with protocols with pcb layer
                    897:         * code - like udp/tcp/raw ip.
                    898:         */
                    899:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    900:                /*
                    901:                 * Check if the packet has already had IPsec processing
                    902:                 * done.  If so, then just pass it along.  This tag gets
                    903:                 * set during AH, ESP, etc. input handling, before the
                    904:                 * packet is returned to the ip input queue for delivery.
                    905:                 */
                    906:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    907:                s = splsoftnet();
                    908:                if (mtag != NULL) {
                    909:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    910:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    911:                } else {
                    912:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    913:                                                   IP_FORWARDING, &error);
                    914:                }
                    915:                if (sp != NULL) {
                    916:                        /*
                    917:                         * Check security policy against packet attributes.
                    918:                         */
                    919:                        error = ipsec_in_reject(sp, m);
                    920:                        KEY_FREESP(&sp);
                    921:                } else {
                    922:                        /* XXX error stat??? */
                    923:                        error = EINVAL;
                    924: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    925:                        goto bad;
                    926:                }
                    927:                splx(s);
                    928:                if (error)
                    929:                        goto bad;
                    930:        }
                    931: #endif /* FAST_IPSEC */
1.1       cgd       932:
                    933:        /*
                    934:         * Switch out to protocol's input routine.
                    935:         */
1.82      aidan     936: #if IFA_STATS
1.122     itojun    937:        if (ia && ip)
1.155     itojun    938:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     939: #endif
1.1       cgd       940:        ipstat.ips_delivered++;
1.89      itojun    941:     {
                    942:        int off = hlen, nh = ip->ip_p;
                    943:
                    944:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    945:        return;
                    946:     }
1.1       cgd       947: bad:
                    948:        m_freem(m);
1.135     thorpej   949:        return;
                    950:
                    951: badcsum:
                    952:        ipstat.ips_badsum++;
                    953:        m_freem(m);
1.1       cgd       954: }
                    955:
                    956: /*
                    957:  * Take incoming datagram fragment and try to
                    958:  * reassemble it into whole datagram.  If a chain for
                    959:  * reassembly of this datagram already exists, then it
                    960:  * is given as fp; otherwise have to make a chain.
                    961:  */
1.50      thorpej   962: struct mbuf *
1.25      cgd       963: ip_reass(ipqe, fp)
1.109     augustss  964:        struct ipqent *ipqe;
                    965:        struct ipq *fp;
1.1       cgd       966: {
1.109     augustss  967:        struct mbuf *m = ipqe->ipqe_m;
                    968:        struct ipqent *nq, *p, *q;
1.25      cgd       969:        struct ip *ip;
1.1       cgd       970:        struct mbuf *t;
1.25      cgd       971:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       972:        int i, next;
                    973:
1.75      thorpej   974:        IPQ_LOCK_CHECK();
                    975:
1.1       cgd       976:        /*
                    977:         * Presence of header sizes in mbufs
                    978:         * would confuse code below.
                    979:         */
                    980:        m->m_data += hlen;
                    981:        m->m_len -= hlen;
                    982:
                    983:        /*
                    984:         * If first fragment to arrive, create a reassembly queue.
                    985:         */
                    986:        if (fp == 0) {
1.131     itojun    987:                /*
                    988:                 * Enforce upper bound on number of fragmented packets
                    989:                 * for which we attempt reassembly;
                    990:                 * If maxfrag is 0, never accept fragments.
                    991:                 * If maxfrag is -1, accept all fragments without limitation.
                    992:                 */
                    993:                if (ip_maxfragpackets < 0)
                    994:                        ;
                    995:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    996:                        goto dropfrag;
                    997:                ip_nfragpackets++;
1.50      thorpej   998:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    999:                    M_FTABLE, M_NOWAIT);
                   1000:                if (fp == NULL)
1.1       cgd      1001:                        goto dropfrag;
1.25      cgd      1002:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd      1003:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1004:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1005:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1006:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1007:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1008:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1009:                p = NULL;
1.1       cgd      1010:                goto insert;
                   1011:        }
                   1012:
                   1013:        /*
                   1014:         * Find a segment which begins after this one does.
                   1015:         */
1.148     matt     1016:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1017:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1018:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1019:                        break;
                   1020:
                   1021:        /*
                   1022:         * If there is a preceding segment, it may provide some of
                   1023:         * our data already.  If so, drop the data from the incoming
                   1024:         * segment.  If it provides all of our data, drop us.
                   1025:         */
1.25      cgd      1026:        if (p != NULL) {
1.155     itojun   1027:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1028:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1029:                if (i > 0) {
1.155     itojun   1030:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1031:                                goto dropfrag;
1.50      thorpej  1032:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1033:                        ipqe->ipqe_ip->ip_off =
                   1034:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1035:                        ipqe->ipqe_ip->ip_len =
                   1036:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1037:                }
                   1038:        }
                   1039:
                   1040:        /*
                   1041:         * While we overlap succeeding segments trim them or,
                   1042:         * if they are completely covered, dequeue them.
                   1043:         */
1.155     itojun   1044:        for (; q != NULL &&
                   1045:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1046:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1047:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1048:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1049:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1050:                        q->ipqe_ip->ip_len =
                   1051:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1052:                        q->ipqe_ip->ip_off =
                   1053:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1054:                        m_adj(q->ipqe_m, i);
1.1       cgd      1055:                        break;
                   1056:                }
1.148     matt     1057:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1058:                m_freem(q->ipqe_m);
1.148     matt     1059:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1060:                pool_put(&ipqent_pool, q);
1.1       cgd      1061:        }
                   1062:
                   1063: insert:
                   1064:        /*
                   1065:         * Stick new segment in its place;
                   1066:         * check for complete reassembly.
                   1067:         */
1.25      cgd      1068:        if (p == NULL) {
1.148     matt     1069:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1070:        } else {
1.148     matt     1071:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1072:        }
1.1       cgd      1073:        next = 0;
1.148     matt     1074:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1075:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1076:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1077:                        return (0);
1.155     itojun   1078:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1079:        }
1.25      cgd      1080:        if (p->ipqe_mff)
1.1       cgd      1081:                return (0);
                   1082:
                   1083:        /*
1.41      thorpej  1084:         * Reassembly is complete.  Check for a bogus message size and
                   1085:         * concatenate fragments.
1.1       cgd      1086:         */
1.148     matt     1087:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1088:        ip = q->ipqe_ip;
1.41      thorpej  1089:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1090:                ipstat.ips_toolong++;
                   1091:                ip_freef(fp);
                   1092:                return (0);
                   1093:        }
1.50      thorpej  1094:        m = q->ipqe_m;
1.1       cgd      1095:        t = m->m_next;
                   1096:        m->m_next = 0;
                   1097:        m_cat(m, t);
1.148     matt     1098:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1099:        pool_put(&ipqent_pool, q);
1.25      cgd      1100:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1101:                t = q->ipqe_m;
1.148     matt     1102:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1103:                pool_put(&ipqent_pool, q);
1.1       cgd      1104:                m_cat(m, t);
                   1105:        }
                   1106:
                   1107:        /*
                   1108:         * Create header for new ip packet by
                   1109:         * modifying header of first packet;
                   1110:         * dequeue and discard fragment reassembly header.
                   1111:         * Make header visible.
                   1112:         */
1.155     itojun   1113:        ip->ip_len = htons(next);
1.25      cgd      1114:        ip->ip_src = fp->ipq_src;
                   1115:        ip->ip_dst = fp->ipq_dst;
                   1116:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1117:        FREE(fp, M_FTABLE);
1.131     itojun   1118:        ip_nfragpackets--;
1.1       cgd      1119:        m->m_len += (ip->ip_hl << 2);
                   1120:        m->m_data -= (ip->ip_hl << 2);
                   1121:        /* some debugging cruft by sklower, below, will go away soon */
                   1122:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1123:                int plen = 0;
1.50      thorpej  1124:                for (t = m; t; t = t->m_next)
                   1125:                        plen += t->m_len;
                   1126:                m->m_pkthdr.len = plen;
1.1       cgd      1127:        }
1.50      thorpej  1128:        return (m);
1.1       cgd      1129:
                   1130: dropfrag:
                   1131:        ipstat.ips_fragdropped++;
                   1132:        m_freem(m);
1.72      thorpej  1133:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1134:        return (0);
                   1135: }
                   1136:
                   1137: /*
                   1138:  * Free a fragment reassembly header and all
                   1139:  * associated datagrams.
                   1140:  */
1.8       mycroft  1141: void
1.1       cgd      1142: ip_freef(fp)
                   1143:        struct ipq *fp;
                   1144: {
1.109     augustss 1145:        struct ipqent *q, *p;
1.1       cgd      1146:
1.75      thorpej  1147:        IPQ_LOCK_CHECK();
                   1148:
1.148     matt     1149:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1150:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1151:                m_freem(q->ipqe_m);
1.148     matt     1152:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1153:                pool_put(&ipqent_pool, q);
1.1       cgd      1154:        }
1.25      cgd      1155:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1156:        FREE(fp, M_FTABLE);
1.131     itojun   1157:        ip_nfragpackets--;
1.1       cgd      1158: }
                   1159:
                   1160: /*
                   1161:  * IP timer processing;
                   1162:  * if a timer expires on a reassembly
                   1163:  * queue, discard it.
                   1164:  */
1.8       mycroft  1165: void
1.1       cgd      1166: ip_slowtimo()
                   1167: {
1.109     augustss 1168:        struct ipq *fp, *nfp;
1.24      mycroft  1169:        int s = splsoftnet();
1.1       cgd      1170:
1.75      thorpej  1171:        IPQ_LOCK();
1.140     matt     1172:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1173:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1174:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1175:                        ipstat.ips_fragtimeout++;
1.25      cgd      1176:                        ip_freef(fp);
1.1       cgd      1177:                }
                   1178:        }
1.131     itojun   1179:        /*
                   1180:         * If we are over the maximum number of fragments
                   1181:         * (due to the limit being lowered), drain off
                   1182:         * enough to get down to the new limit.
                   1183:         */
                   1184:        if (ip_maxfragpackets < 0)
                   1185:                ;
                   1186:        else {
1.140     matt     1187:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1188:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1189:        }
1.75      thorpej  1190:        IPQ_UNLOCK();
1.63      matt     1191: #ifdef GATEWAY
                   1192:        ipflow_slowtimo();
                   1193: #endif
1.1       cgd      1194:        splx(s);
                   1195: }
                   1196:
                   1197: /*
                   1198:  * Drain off all datagram fragments.
                   1199:  */
1.8       mycroft  1200: void
1.1       cgd      1201: ip_drain()
                   1202: {
                   1203:
1.75      thorpej  1204:        /*
                   1205:         * We may be called from a device's interrupt context.  If
                   1206:         * the ipq is already busy, just bail out now.
                   1207:         */
                   1208:        if (ipq_lock_try() == 0)
                   1209:                return;
                   1210:
1.140     matt     1211:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1212:                ipstat.ips_fragdropped++;
1.140     matt     1213:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1214:        }
1.75      thorpej  1215:
                   1216:        IPQ_UNLOCK();
1.1       cgd      1217: }
                   1218:
                   1219: /*
                   1220:  * Do option processing on a datagram,
                   1221:  * possibly discarding it if bad options are encountered,
                   1222:  * or forwarding it if source-routed.
                   1223:  * Returns 1 if packet has been forwarded/freed,
                   1224:  * 0 if the packet should be processed further.
                   1225:  */
1.8       mycroft  1226: int
1.1       cgd      1227: ip_dooptions(m)
                   1228:        struct mbuf *m;
                   1229: {
1.109     augustss 1230:        struct ip *ip = mtod(m, struct ip *);
                   1231:        u_char *cp, *cp0;
                   1232:        struct ip_timestamp *ipt;
                   1233:        struct in_ifaddr *ia;
1.1       cgd      1234:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1235:        struct in_addr dst;
1.1       cgd      1236:        n_time ntime;
                   1237:
1.13      mycroft  1238:        dst = ip->ip_dst;
1.1       cgd      1239:        cp = (u_char *)(ip + 1);
                   1240:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1241:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1242:                opt = cp[IPOPT_OPTVAL];
                   1243:                if (opt == IPOPT_EOL)
                   1244:                        break;
                   1245:                if (opt == IPOPT_NOP)
                   1246:                        optlen = 1;
                   1247:                else {
1.113     itojun   1248:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1249:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1250:                                goto bad;
                   1251:                        }
1.1       cgd      1252:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1253:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1254:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1255:                                goto bad;
                   1256:                        }
                   1257:                }
                   1258:                switch (opt) {
                   1259:
                   1260:                default:
                   1261:                        break;
                   1262:
                   1263:                /*
                   1264:                 * Source routing with record.
                   1265:                 * Find interface with current destination address.
                   1266:                 * If none on this machine then drop if strictly routed,
                   1267:                 * or do nothing if loosely routed.
                   1268:                 * Record interface address and bring up next address
                   1269:                 * component.  If strictly routed make sure next
                   1270:                 * address is on directly accessible net.
                   1271:                 */
                   1272:                case IPOPT_LSRR:
                   1273:                case IPOPT_SSRR:
1.47      cjs      1274:                        if (ip_allowsrcrt == 0) {
                   1275:                                type = ICMP_UNREACH;
                   1276:                                code = ICMP_UNREACH_NET_PROHIB;
                   1277:                                goto bad;
                   1278:                        }
1.114     itojun   1279:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1280:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1281:                                goto bad;
                   1282:                        }
1.1       cgd      1283:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1284:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1285:                                goto bad;
                   1286:                        }
                   1287:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1288:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1289:                        if (ia == 0) {
                   1290:                                if (opt == IPOPT_SSRR) {
                   1291:                                        type = ICMP_UNREACH;
                   1292:                                        code = ICMP_UNREACH_SRCFAIL;
                   1293:                                        goto bad;
                   1294:                                }
                   1295:                                /*
                   1296:                                 * Loose routing, and not at next destination
                   1297:                                 * yet; nothing to do except forward.
                   1298:                                 */
                   1299:                                break;
                   1300:                        }
                   1301:                        off--;                  /* 0 origin */
1.112     sommerfe 1302:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1303:                                /*
                   1304:                                 * End of source route.  Should be for us.
                   1305:                                 */
                   1306:                                save_rte(cp, ip->ip_src);
                   1307:                                break;
                   1308:                        }
                   1309:                        /*
                   1310:                         * locate outgoing interface
                   1311:                         */
                   1312:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1313:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1314:                        if (opt == IPOPT_SSRR)
                   1315:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1316:                        else
1.1       cgd      1317:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1318:                        if (ia == 0) {
                   1319:                                type = ICMP_UNREACH;
                   1320:                                code = ICMP_UNREACH_SRCFAIL;
                   1321:                                goto bad;
                   1322:                        }
                   1323:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1324:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1325:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1326:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1327:                        /*
                   1328:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1329:                         */
1.18      mycroft  1330:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1331:                        break;
                   1332:
                   1333:                case IPOPT_RR:
1.114     itojun   1334:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1335:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1336:                                goto bad;
                   1337:                        }
1.1       cgd      1338:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1339:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1340:                                goto bad;
                   1341:                        }
                   1342:                        /*
                   1343:                         * If no space remains, ignore.
                   1344:                         */
                   1345:                        off--;                  /* 0 origin */
1.112     sommerfe 1346:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1347:                                break;
                   1348:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1349:                            sizeof(ipaddr.sin_addr));
                   1350:                        /*
                   1351:                         * locate outgoing interface; if we're the destination,
                   1352:                         * use the incoming interface (should be same).
                   1353:                         */
1.96      thorpej  1354:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1355:                            == NULL &&
                   1356:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1357:                                type = ICMP_UNREACH;
                   1358:                                code = ICMP_UNREACH_HOST;
                   1359:                                goto bad;
                   1360:                        }
1.20      mycroft  1361:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1362:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1363:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1364:                        break;
                   1365:
                   1366:                case IPOPT_TS:
                   1367:                        code = cp - (u_char *)ip;
                   1368:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1369:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1370:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1371:                                goto bad;
1.114     itojun   1372:                        }
                   1373:                        if (ipt->ipt_ptr < 5) {
                   1374:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1375:                                goto bad;
                   1376:                        }
1.15      cgd      1377:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1378:                                if (++ipt->ipt_oflw == 0) {
                   1379:                                        code = (u_char *)&ipt->ipt_ptr -
                   1380:                                            (u_char *)ip;
1.1       cgd      1381:                                        goto bad;
1.114     itojun   1382:                                }
1.1       cgd      1383:                                break;
                   1384:                        }
1.104     thorpej  1385:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1386:                        switch (ipt->ipt_flg) {
                   1387:
                   1388:                        case IPOPT_TS_TSONLY:
                   1389:                                break;
                   1390:
                   1391:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1392:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1393:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1394:                                        code = (u_char *)&ipt->ipt_ptr -
                   1395:                                            (u_char *)ip;
1.1       cgd      1396:                                        goto bad;
1.114     itojun   1397:                                }
1.13      mycroft  1398:                                ipaddr.sin_addr = dst;
1.96      thorpej  1399:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1400:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1401:                                if (ia == 0)
                   1402:                                        continue;
1.104     thorpej  1403:                                bcopy(&ia->ia_addr.sin_addr,
                   1404:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1405:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1406:                                break;
                   1407:
                   1408:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1409:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1410:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1411:                                        code = (u_char *)&ipt->ipt_ptr -
                   1412:                                            (u_char *)ip;
1.1       cgd      1413:                                        goto bad;
1.114     itojun   1414:                                }
1.104     thorpej  1415:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1416:                                    sizeof(struct in_addr));
1.96      thorpej  1417:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1418:                                    == NULL)
1.1       cgd      1419:                                        continue;
                   1420:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1421:                                break;
                   1422:
                   1423:                        default:
1.114     itojun   1424:                                /* XXX can't take &ipt->ipt_flg */
                   1425:                                code = (u_char *)&ipt->ipt_ptr -
                   1426:                                    (u_char *)ip + 1;
1.1       cgd      1427:                                goto bad;
                   1428:                        }
                   1429:                        ntime = iptime();
1.107     thorpej  1430:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1431:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1432:                            sizeof(n_time));
                   1433:                        ipt->ipt_ptr += sizeof(n_time);
                   1434:                }
                   1435:        }
                   1436:        if (forward) {
1.26      thorpej  1437:                if (ip_forwsrcrt == 0) {
                   1438:                        type = ICMP_UNREACH;
                   1439:                        code = ICMP_UNREACH_SRCFAIL;
                   1440:                        goto bad;
                   1441:                }
1.1       cgd      1442:                ip_forward(m, 1);
                   1443:                return (1);
1.13      mycroft  1444:        }
                   1445:        return (0);
1.1       cgd      1446: bad:
1.13      mycroft  1447:        icmp_error(m, type, code, 0, 0);
                   1448:        ipstat.ips_badoptions++;
1.1       cgd      1449:        return (1);
                   1450: }
                   1451:
                   1452: /*
                   1453:  * Given address of next destination (final or next hop),
                   1454:  * return internet address info of interface to be used to get there.
                   1455:  */
                   1456: struct in_ifaddr *
                   1457: ip_rtaddr(dst)
                   1458:         struct in_addr dst;
                   1459: {
1.109     augustss 1460:        struct sockaddr_in *sin;
1.1       cgd      1461:
1.19      mycroft  1462:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1463:
1.35      mycroft  1464:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1465:                if (ipforward_rt.ro_rt) {
                   1466:                        RTFREE(ipforward_rt.ro_rt);
                   1467:                        ipforward_rt.ro_rt = 0;
                   1468:                }
                   1469:                sin->sin_family = AF_INET;
                   1470:                sin->sin_len = sizeof(*sin);
                   1471:                sin->sin_addr = dst;
                   1472:
                   1473:                rtalloc(&ipforward_rt);
                   1474:        }
                   1475:        if (ipforward_rt.ro_rt == 0)
                   1476:                return ((struct in_ifaddr *)0);
1.19      mycroft  1477:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1478: }
                   1479:
                   1480: /*
                   1481:  * Save incoming source route for use in replies,
                   1482:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1483:  */
1.13      mycroft  1484: void
1.1       cgd      1485: save_rte(option, dst)
                   1486:        u_char *option;
                   1487:        struct in_addr dst;
                   1488: {
                   1489:        unsigned olen;
                   1490:
                   1491:        olen = option[IPOPT_OLEN];
                   1492: #ifdef DIAGNOSTIC
                   1493:        if (ipprintfs)
1.39      christos 1494:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1495: #endif /* 0 */
1.1       cgd      1496:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1497:                return;
                   1498:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1499:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1500:        ip_srcrt.dst = dst;
                   1501: }
                   1502:
                   1503: /*
                   1504:  * Retrieve incoming source route for use in replies,
                   1505:  * in the same form used by setsockopt.
                   1506:  * The first hop is placed before the options, will be removed later.
                   1507:  */
                   1508: struct mbuf *
                   1509: ip_srcroute()
                   1510: {
1.109     augustss 1511:        struct in_addr *p, *q;
                   1512:        struct mbuf *m;
1.1       cgd      1513:
                   1514:        if (ip_nhops == 0)
                   1515:                return ((struct mbuf *)0);
                   1516:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1517:        if (m == 0)
                   1518:                return ((struct mbuf *)0);
                   1519:
1.164     matt     1520:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1521: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1522:
                   1523:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1524:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1525:            OPTSIZ;
                   1526: #ifdef DIAGNOSTIC
                   1527:        if (ipprintfs)
1.39      christos 1528:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1529: #endif
                   1530:
                   1531:        /*
                   1532:         * First save first hop for return route
                   1533:         */
                   1534:        p = &ip_srcrt.route[ip_nhops - 1];
                   1535:        *(mtod(m, struct in_addr *)) = *p--;
                   1536: #ifdef DIAGNOSTIC
                   1537:        if (ipprintfs)
1.39      christos 1538:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1539: #endif
                   1540:
                   1541:        /*
                   1542:         * Copy option fields and padding (nop) to mbuf.
                   1543:         */
                   1544:        ip_srcrt.nop = IPOPT_NOP;
                   1545:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1546:        bcopy((caddr_t)&ip_srcrt.nop,
                   1547:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1548:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1549:            sizeof(struct in_addr) + OPTSIZ);
                   1550: #undef OPTSIZ
                   1551:        /*
                   1552:         * Record return path as an IP source route,
                   1553:         * reversing the path (pointers are now aligned).
                   1554:         */
                   1555:        while (p >= ip_srcrt.route) {
                   1556: #ifdef DIAGNOSTIC
                   1557:                if (ipprintfs)
1.39      christos 1558:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1559: #endif
                   1560:                *q++ = *p--;
                   1561:        }
                   1562:        /*
                   1563:         * Last hop goes to final destination.
                   1564:         */
                   1565:        *q = ip_srcrt.dst;
                   1566: #ifdef DIAGNOSTIC
                   1567:        if (ipprintfs)
1.39      christos 1568:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1569: #endif
                   1570:        return (m);
                   1571: }
                   1572:
                   1573: /*
                   1574:  * Strip out IP options, at higher
                   1575:  * level protocol in the kernel.
                   1576:  * Second argument is buffer to which options
                   1577:  * will be moved, and return value is their length.
                   1578:  * XXX should be deleted; last arg currently ignored.
                   1579:  */
1.8       mycroft  1580: void
1.1       cgd      1581: ip_stripoptions(m, mopt)
1.109     augustss 1582:        struct mbuf *m;
1.1       cgd      1583:        struct mbuf *mopt;
                   1584: {
1.109     augustss 1585:        int i;
1.1       cgd      1586:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1587:        caddr_t opts;
1.1       cgd      1588:        int olen;
                   1589:
1.79      mycroft  1590:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1591:        opts = (caddr_t)(ip + 1);
                   1592:        i = m->m_len - (sizeof (struct ip) + olen);
                   1593:        bcopy(opts  + olen, opts, (unsigned)i);
                   1594:        m->m_len -= olen;
                   1595:        if (m->m_flags & M_PKTHDR)
                   1596:                m->m_pkthdr.len -= olen;
1.155     itojun   1597:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1598:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1599: }
                   1600:
1.139     matt     1601: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1602:        0,              0,              0,              0,
                   1603:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1604:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1605:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1606:        0,              0,              0,              0,
                   1607:        ENOPROTOOPT
                   1608: };
                   1609:
                   1610: /*
                   1611:  * Forward a packet.  If some error occurs return the sender
                   1612:  * an icmp packet.  Note we can't always generate a meaningful
                   1613:  * icmp message because icmp doesn't have a large enough repertoire
                   1614:  * of codes and types.
                   1615:  *
                   1616:  * If not forwarding, just drop the packet.  This could be confusing
                   1617:  * if ipforwarding was zero but some routing protocol was advancing
                   1618:  * us as a gateway to somewhere.  However, we must let the routing
                   1619:  * protocol deal with that.
                   1620:  *
                   1621:  * The srcrt parameter indicates whether the packet is being forwarded
                   1622:  * via a source route.
                   1623:  */
1.13      mycroft  1624: void
1.1       cgd      1625: ip_forward(m, srcrt)
                   1626:        struct mbuf *m;
                   1627:        int srcrt;
                   1628: {
1.109     augustss 1629:        struct ip *ip = mtod(m, struct ip *);
                   1630:        struct sockaddr_in *sin;
                   1631:        struct rtentry *rt;
1.28      christos 1632:        int error, type = 0, code = 0;
1.1       cgd      1633:        struct mbuf *mcopy;
1.13      mycroft  1634:        n_long dest;
                   1635:        struct ifnet *destifp;
1.173     jonathan 1636: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1637:        struct ifnet dummyifp;
                   1638: #endif
1.164     matt     1639:
                   1640:        /*
                   1641:         * We are now in the output path.
                   1642:         */
                   1643:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1644:
                   1645:        /*
                   1646:         * Clear any in-bound checksum flags for this packet.
                   1647:         */
                   1648:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1649:
1.13      mycroft  1650:        dest = 0;
1.1       cgd      1651: #ifdef DIAGNOSTIC
                   1652:        if (ipprintfs)
1.70      thorpej  1653:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1654:                    ntohl(ip->ip_src.s_addr),
                   1655:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1656: #endif
1.93      sommerfe 1657:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1658:                ipstat.ips_cantforward++;
                   1659:                m_freem(m);
                   1660:                return;
                   1661:        }
                   1662:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1663:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1664:                return;
                   1665:        }
                   1666:        ip->ip_ttl -= IPTTLDEC;
                   1667:
1.19      mycroft  1668:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1669:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1670:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1671:                if (ipforward_rt.ro_rt) {
                   1672:                        RTFREE(ipforward_rt.ro_rt);
                   1673:                        ipforward_rt.ro_rt = 0;
                   1674:                }
                   1675:                sin->sin_family = AF_INET;
1.35      mycroft  1676:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1677:                sin->sin_addr = ip->ip_dst;
                   1678:
                   1679:                rtalloc(&ipforward_rt);
                   1680:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1681:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1682:                        return;
                   1683:                }
                   1684:                rt = ipforward_rt.ro_rt;
                   1685:        }
                   1686:
                   1687:        /*
1.34      mycroft  1688:         * Save at most 68 bytes of the packet in case
1.1       cgd      1689:         * we need to generate an ICMP message to the src.
1.119     itojun   1690:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1691:         */
1.155     itojun   1692:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1693:        if (mcopy)
                   1694:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1695:
                   1696:        /*
                   1697:         * If forwarding packet using same interface that it came in on,
                   1698:         * perhaps should send a redirect to sender to shortcut a hop.
                   1699:         * Only send redirect if source is sending directly to us,
                   1700:         * and if packet was not source routed (or has any options).
                   1701:         * Also, don't send redirect if forwarding using a default route
                   1702:         * or a route modified by a redirect.
                   1703:         */
                   1704:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1705:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1706:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1707:            ipsendredirects && !srcrt) {
1.19      mycroft  1708:                if (rt->rt_ifa &&
                   1709:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1710:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1711:                        if (rt->rt_flags & RTF_GATEWAY)
                   1712:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1713:                        else
                   1714:                                dest = ip->ip_dst.s_addr;
                   1715:                        /*
                   1716:                         * Router requirements says to only send host
                   1717:                         * redirects.
                   1718:                         */
                   1719:                        type = ICMP_REDIRECT;
                   1720:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1721: #ifdef DIAGNOSTIC
1.77      thorpej  1722:                        if (ipprintfs)
                   1723:                                printf("redirect (%d) to %x\n", code,
                   1724:                                    (u_int32_t)dest);
1.1       cgd      1725: #endif
                   1726:                }
                   1727:        }
                   1728:
1.27      thorpej  1729:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1730:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1731:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1732:
1.1       cgd      1733:        if (error)
                   1734:                ipstat.ips_cantforward++;
                   1735:        else {
                   1736:                ipstat.ips_forward++;
                   1737:                if (type)
                   1738:                        ipstat.ips_redirectsent++;
                   1739:                else {
1.63      matt     1740:                        if (mcopy) {
                   1741: #ifdef GATEWAY
1.64      thorpej  1742:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1743:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1744: #endif
1.1       cgd      1745:                                m_freem(mcopy);
1.63      matt     1746:                        }
1.1       cgd      1747:                        return;
                   1748:                }
                   1749:        }
                   1750:        if (mcopy == NULL)
                   1751:                return;
1.13      mycroft  1752:        destifp = NULL;
                   1753:
1.1       cgd      1754:        switch (error) {
                   1755:
                   1756:        case 0:                         /* forwarded, but need redirect */
                   1757:                /* type, code set above */
                   1758:                break;
                   1759:
                   1760:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1761:        case EHOSTUNREACH:
                   1762:        case ENETDOWN:
                   1763:        case EHOSTDOWN:
                   1764:        default:
                   1765:                type = ICMP_UNREACH;
                   1766:                code = ICMP_UNREACH_HOST;
                   1767:                break;
                   1768:
                   1769:        case EMSGSIZE:
                   1770:                type = ICMP_UNREACH;
                   1771:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1772: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1773:                if (ipforward_rt.ro_rt)
                   1774:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1775: #else
                   1776:                /*
                   1777:                 * If the packet is routed over IPsec tunnel, tell the
                   1778:                 * originator the tunnel MTU.
                   1779:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1780:                 * XXX quickhack!!!
                   1781:                 */
                   1782:                if (ipforward_rt.ro_rt) {
                   1783:                        struct secpolicy *sp;
                   1784:                        int ipsecerror;
1.95      itojun   1785:                        size_t ipsechdr;
1.89      itojun   1786:                        struct route *ro;
                   1787:
                   1788:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1789:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1790:                            &ipsecerror);
1.89      itojun   1791:
                   1792:                        if (sp == NULL)
                   1793:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1794:                        else {
                   1795:                                /* count IPsec header size */
1.95      itojun   1796:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1797:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1798:
                   1799:                                /*
                   1800:                                 * find the correct route for outer IPv4
                   1801:                                 * header, compute tunnel MTU.
                   1802:                                 *
                   1803:                                 * XXX BUG ALERT
                   1804:                                 * The "dummyifp" code relies upon the fact
                   1805:                                 * that icmp_error() touches only ifp->if_mtu.
                   1806:                                 */
                   1807:                                /*XXX*/
                   1808:                                destifp = NULL;
                   1809:                                if (sp->req != NULL
1.95      itojun   1810:                                 && sp->req->sav != NULL
                   1811:                                 && sp->req->sav->sah != NULL) {
                   1812:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1813:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1814:                                                dummyifp.if_mtu =
1.151     itojun   1815:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1816:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1817:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1818:                                                dummyifp.if_mtu -= ipsechdr;
                   1819:                                                destifp = &dummyifp;
                   1820:                                        }
                   1821:                                }
                   1822:
1.173     jonathan 1823: #ifdef IPSEC
1.89      itojun   1824:                                key_freesp(sp);
1.173     jonathan 1825: #else
                   1826:                                KEY_FREESP(&sp);
                   1827: #endif
1.89      itojun   1828:                        }
                   1829:                }
                   1830: #endif /*IPSEC*/
1.1       cgd      1831:                ipstat.ips_cantfrag++;
                   1832:                break;
                   1833:
                   1834:        case ENOBUFS:
1.143     itojun   1835: #if 1
                   1836:                /*
                   1837:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1838:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1839:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1840:                 * or if the underlying interface is rate-limited.
1.143     itojun   1841:                 */
                   1842:                if (mcopy)
                   1843:                        m_freem(mcopy);
                   1844:                return;
                   1845: #else
1.1       cgd      1846:                type = ICMP_SOURCEQUENCH;
                   1847:                code = 0;
                   1848:                break;
1.143     itojun   1849: #endif
1.1       cgd      1850:        }
1.13      mycroft  1851:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1852: }
                   1853:
                   1854: void
                   1855: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1856:        struct inpcb *inp;
                   1857:        struct mbuf **mp;
                   1858:        struct ip *ip;
                   1859:        struct mbuf *m;
1.44      thorpej  1860: {
                   1861:
                   1862:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1863:                struct timeval tv;
                   1864:
                   1865:                microtime(&tv);
                   1866:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1867:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1868:                if (*mp)
                   1869:                        mp = &(*mp)->m_next;
                   1870:        }
                   1871:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1872:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1873:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1874:                if (*mp)
                   1875:                        mp = &(*mp)->m_next;
                   1876:        }
                   1877: #ifdef notyet
                   1878:        /*
                   1879:         * XXX
                   1880:         * Moving these out of udp_input() made them even more broken
                   1881:         * than they already were.
                   1882:         *      - fenner@parc.xerox.com
                   1883:         */
                   1884:        /* options were tossed already */
                   1885:        if (inp->inp_flags & INP_RECVOPTS) {
                   1886:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1887:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1888:                if (*mp)
                   1889:                        mp = &(*mp)->m_next;
                   1890:        }
                   1891:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1892:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1893:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1894:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1895:                if (*mp)
                   1896:                        mp = &(*mp)->m_next;
                   1897:        }
                   1898: #endif
                   1899:        if (inp->inp_flags & INP_RECVIF) {
                   1900:                struct sockaddr_dl sdl;
                   1901:
                   1902:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1903:                sdl.sdl_family = AF_LINK;
                   1904:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1905:                    m->m_pkthdr.rcvif->if_index : 0;
                   1906:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1907:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1908:                    IP_RECVIF, IPPROTO_IP);
                   1909:                if (*mp)
                   1910:                        mp = &(*mp)->m_next;
                   1911:        }
1.13      mycroft  1912: }
                   1913:
                   1914: int
                   1915: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1916:        int *name;
                   1917:        u_int namelen;
                   1918:        void *oldp;
                   1919:        size_t *oldlenp;
                   1920:        void *newp;
                   1921:        size_t newlen;
                   1922: {
1.88      sommerfe 1923:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1924:
1.54      lukem    1925:        int error, old;
                   1926:
1.180     jonathan 1927:        /* All sysctl names (except ifq.*) at this level are terminal. */
                   1928:        if ((namelen != 1) && !(namelen == 2 && name[0] == IPCTL_IFQ))
                   1929:                return (ENOTDIR);
1.13      mycroft  1930:
                   1931:        switch (name[0]) {
                   1932:        case IPCTL_FORWARDING:
                   1933:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1934:        case IPCTL_SENDREDIRECTS:
                   1935:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1936:                        &ipsendredirects));
                   1937:        case IPCTL_DEFTTL:
                   1938:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1939: #ifdef notyet
                   1940:        case IPCTL_DEFMTU:
                   1941:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1942: #endif
1.26      thorpej  1943:        case IPCTL_FORWSRCRT:
1.47      cjs      1944:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1945:                if (securelevel > 0)
1.46      cjs      1946:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1947:                            ip_forwsrcrt));
                   1948:                else
                   1949:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1950:                            &ip_forwsrcrt));
1.27      thorpej  1951:        case IPCTL_DIRECTEDBCAST:
                   1952:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1953:                    &ip_directedbcast));
1.47      cjs      1954:        case IPCTL_ALLOWSRCRT:
                   1955:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1956:                    &ip_allowsrcrt));
1.52      thorpej  1957:        case IPCTL_SUBNETSARELOCAL:
                   1958:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1959:                    &subnetsarelocal));
1.53      kml      1960:        case IPCTL_MTUDISC:
1.60      kml      1961:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1962:                    &ip_mtudisc);
1.163     itojun   1963:                if (error == 0 && ip_mtudisc == 0)
                   1964:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1965:                return error;
1.54      lukem    1966:        case IPCTL_ANONPORTMIN:
                   1967:                old = anonportmin;
                   1968:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1969:                if (anonportmin >= anonportmax || anonportmin < 0
                   1970:                    || anonportmin > 65535
1.54      lukem    1971: #ifndef IPNOPRIVPORTS
                   1972:                    || anonportmin < IPPORT_RESERVED
                   1973: #endif
                   1974:                    ) {
                   1975:                        anonportmin = old;
                   1976:                        return (EINVAL);
                   1977:                }
                   1978:                return (error);
                   1979:        case IPCTL_ANONPORTMAX:
                   1980:                old = anonportmax;
                   1981:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1982:                if (anonportmin >= anonportmax || anonportmax < 0
                   1983:                    || anonportmax > 65535
1.54      lukem    1984: #ifndef IPNOPRIVPORTS
                   1985:                    || anonportmax < IPPORT_RESERVED
                   1986: #endif
                   1987:                    ) {
                   1988:                        anonportmax = old;
                   1989:                        return (EINVAL);
                   1990:                }
1.60      kml      1991:                return (error);
                   1992:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   1993:                old = ip_mtudisc_timeout;
1.60      kml      1994:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1995:                   &ip_mtudisc_timeout);
1.158     itojun   1996:                if (ip_mtudisc_timeout < 0) {
                   1997:                        ip_mtudisc_timeout = old;
1.156     itojun   1998:                        return (EINVAL);
1.158     itojun   1999:                }
1.163     itojun   2000:                if (error == 0)
1.162     itojun   2001:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   2002:                                              ip_mtudisc_timeout);
1.54      lukem    2003:                return (error);
1.65      matt     2004: #ifdef GATEWAY
                   2005:        case IPCTL_MAXFLOWS:
1.67      thorpej  2006:            {
                   2007:                int s;
                   2008:
1.65      matt     2009:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   2010:                   &ip_maxflows);
1.67      thorpej  2011:                s = splsoftnet();
1.65      matt     2012:                ipflow_reap(0);
1.67      thorpej  2013:                splx(s);
1.65      matt     2014:                return (error);
1.67      thorpej  2015:            }
1.89      itojun   2016: #endif
1.90      itojun   2017:        case IPCTL_HOSTZEROBROADCAST:
                   2018:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2019:                    &hostzeroisbroadcast));
1.89      itojun   2020: #if NGIF > 0
                   2021:        case IPCTL_GIF_TTL:
1.157     itojun   2022:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   2023:                                  &ip_gif_ttl));
1.144     martin   2024: #endif
                   2025:
                   2026: #if NGRE > 0
                   2027:        case IPCTL_GRE_TTL:
1.157     itojun   2028:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   2029:                                  &ip_gre_ttl));
1.117     tron     2030: #endif
                   2031:
                   2032: #ifndef IPNOPRIVPORTS
                   2033:        case IPCTL_LOWPORTMIN:
                   2034:                old = lowportmin;
                   2035:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   2036:                if (lowportmin >= lowportmax
                   2037:                    || lowportmin > IPPORT_RESERVEDMAX
                   2038:                    || lowportmin < IPPORT_RESERVEDMIN
                   2039:                    ) {
                   2040:                        lowportmin = old;
                   2041:                        return (EINVAL);
                   2042:                }
                   2043:                return (error);
                   2044:        case IPCTL_LOWPORTMAX:
                   2045:                old = lowportmax;
                   2046:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   2047:                if (lowportmin >= lowportmax
                   2048:                    || lowportmax > IPPORT_RESERVEDMAX
                   2049:                    || lowportmax < IPPORT_RESERVEDMIN
                   2050:                    ) {
                   2051:                        lowportmax = old;
                   2052:                        return (EINVAL);
                   2053:                }
                   2054:                return (error);
1.65      matt     2055: #endif
1.131     itojun   2056:
                   2057:        case IPCTL_MAXFRAGPACKETS:
                   2058:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2059:                    &ip_maxfragpackets));
1.88      sommerfe 2060:
1.165     christos 2061:        case IPCTL_CHECKINTERFACE:
                   2062:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2063:                    &ip_checkinterface));
1.182     itojun   2064:
1.180     jonathan 2065:        case IPCTL_IFQ:
1.182     itojun   2066:                return (sysctl_ifq(name + 1, namelen - 1, oldp, oldlenp,
                   2067:                    newp, newlen, &ipintrq));
1.180     jonathan 2068:
1.13      mycroft  2069:        default:
                   2070:                return (EOPNOTSUPP);
                   2071:        }
                   2072:        /* NOTREACHED */
1.1       cgd      2073: }

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