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Annotation of src/sys/netinet/ip_input.c, Revision 1.179

1.179   ! mycroft     1: /*     $NetBSD: ip_input.c,v 1.178 2003/09/06 03:36:30 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>
1.179   ! mycroft   101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.178 2003/09/06 03:36:30 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 */
1.22      mycroft   222: struct in_ifaddrhead in_ifaddr;
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;
1.75      thorpej   229:
1.121     thorpej   230: #ifdef PFIL_HOOKS
                    231: struct pfil_head inet_pfil_hook;
                    232: #endif
                    233:
1.63      matt      234: struct ipqhead ipq;
1.75      thorpej   235: int    ipq_locked;
1.131     itojun    236: int    ip_nfragpackets = 0;
1.133     itojun    237: int    ip_maxfragpackets = 200;
1.75      thorpej   238:
                    239: static __inline int ipq_lock_try __P((void));
                    240: static __inline void ipq_unlock __P((void));
                    241:
                    242: static __inline int
                    243: ipq_lock_try()
                    244: {
                    245:        int s;
                    246:
1.132     thorpej   247:        /*
1.149     wiz       248:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   249:         * mbuf allocation.
                    250:         */
                    251:        s = splvm();
1.75      thorpej   252:        if (ipq_locked) {
                    253:                splx(s);
                    254:                return (0);
                    255:        }
                    256:        ipq_locked = 1;
                    257:        splx(s);
                    258:        return (1);
                    259: }
                    260:
                    261: static __inline void
                    262: ipq_unlock()
                    263: {
                    264:        int s;
                    265:
1.132     thorpej   266:        s = splvm();
1.75      thorpej   267:        ipq_locked = 0;
                    268:        splx(s);
                    269: }
                    270:
                    271: #ifdef DIAGNOSTIC
                    272: #define        IPQ_LOCK()                                                      \
                    273: do {                                                                   \
                    274:        if (ipq_lock_try() == 0) {                                      \
                    275:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    276:                panic("ipq_lock");                                      \
                    277:        }                                                               \
1.159     perry     278: } while (/*CONSTCOND*/ 0)
1.75      thorpej   279: #define        IPQ_LOCK_CHECK()                                                \
                    280: do {                                                                   \
                    281:        if (ipq_locked == 0) {                                          \
                    282:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    283:                panic("ipq lock check");                                \
                    284:        }                                                               \
1.159     perry     285: } while (/*CONSTCOND*/ 0)
1.75      thorpej   286: #else
                    287: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    288: #define        IPQ_LOCK_CHECK()        /* nothing */
                    289: #endif
                    290:
                    291: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       292:
1.166     matt      293: struct pool inmulti_pool;
1.72      thorpej   294: struct pool ipqent_pool;
                    295:
1.135     thorpej   296: #ifdef INET_CSUM_COUNTERS
                    297: #include <sys/device.h>
                    298:
                    299: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    300:     NULL, "inet", "hwcsum bad");
                    301: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    302:     NULL, "inet", "hwcsum ok");
                    303: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    304:     NULL, "inet", "swcsum");
                    305:
                    306: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    307:
                    308: #else
                    309:
                    310: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    311:
                    312: #endif /* INET_CSUM_COUNTERS */
                    313:
1.1       cgd       314: /*
                    315:  * We need to save the IP options in case a protocol wants to respond
                    316:  * to an incoming packet over the same route if the packet got here
                    317:  * using IP source routing.  This allows connection establishment and
                    318:  * maintenance when the remote end is on a network that is not known
                    319:  * to us.
                    320:  */
                    321: int    ip_nhops = 0;
                    322: static struct ip_srcrt {
                    323:        struct  in_addr dst;                    /* final destination */
                    324:        char    nop;                            /* one NOP to align */
                    325:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    326:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    327: } ip_srcrt;
                    328:
1.13      mycroft   329: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   330:
1.164     matt      331: #ifdef MBUFTRACE
                    332: struct mowner ip_rx_mowner = { "internet", "rx" };
                    333: struct mowner ip_tx_mowner = { "internet", "tx" };
                    334: #endif
                    335:
1.1       cgd       336: /*
                    337:  * IP initialization: fill in IP protocol switch table.
                    338:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    339:  */
1.8       mycroft   340: void
1.1       cgd       341: ip_init()
                    342: {
1.109     augustss  343:        struct protosw *pr;
                    344:        int i;
1.1       cgd       345:
1.166     matt      346:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    347:            NULL);
1.72      thorpej   348:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   349:            NULL);
1.72      thorpej   350:
1.1       cgd       351:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    352:        if (pr == 0)
                    353:                panic("ip_init");
                    354:        for (i = 0; i < IPPROTO_MAX; i++)
                    355:                ip_protox[i] = pr - inetsw;
                    356:        for (pr = inetdomain.dom_protosw;
                    357:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    358:                if (pr->pr_domain->dom_family == PF_INET &&
                    359:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    360:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       361:        LIST_INIT(&ipq);
1.1       cgd       362:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   363:        TAILQ_INIT(&in_ifaddr);
1.120     ad        364:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    365:            M_WAITOK, &in_ifaddrhash);
1.166     matt      366:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    367:            M_WAITOK, &in_multihash);
1.160     itojun    368:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   369: #ifdef GATEWAY
                    370:        ipflow_init();
                    371: #endif
1.121     thorpej   372:
                    373: #ifdef PFIL_HOOKS
                    374:        /* Register our Packet Filter hook. */
1.126     thorpej   375:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    376:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   377:        i = pfil_head_register(&inet_pfil_hook);
                    378:        if (i != 0)
                    379:                printf("ip_init: WARNING: unable to register pfil hook, "
                    380:                    "error %d\n", i);
                    381: #endif /* PFIL_HOOKS */
1.135     thorpej   382:
                    383: #ifdef INET_CSUM_COUNTERS
                    384:        evcnt_attach_static(&ip_hwcsum_bad);
                    385:        evcnt_attach_static(&ip_hwcsum_ok);
                    386:        evcnt_attach_static(&ip_swcsum);
                    387: #endif /* INET_CSUM_COUNTERS */
1.164     matt      388:
                    389: #ifdef MBUFTRACE
                    390:        MOWNER_ATTACH(&ip_tx_mowner);
                    391:        MOWNER_ATTACH(&ip_rx_mowner);
                    392: #endif /* MBUFTRACE */
1.1       cgd       393: }
                    394:
                    395: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    396: struct route ipforward_rt;
                    397:
                    398: /*
1.89      itojun    399:  * IP software interrupt routine
                    400:  */
                    401: void
                    402: ipintr()
                    403: {
                    404:        int s;
                    405:        struct mbuf *m;
                    406:
                    407:        while (1) {
1.132     thorpej   408:                s = splnet();
1.89      itojun    409:                IF_DEQUEUE(&ipintrq, m);
                    410:                splx(s);
                    411:                if (m == 0)
                    412:                        return;
1.164     matt      413:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    414:                ip_input(m);
                    415:        }
                    416: }
                    417:
                    418: /*
1.1       cgd       419:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    420:  * try to reassemble.  Process options.  Pass to next level.
                    421:  */
1.8       mycroft   422: void
1.89      itojun    423: ip_input(struct mbuf *m)
1.1       cgd       424: {
1.109     augustss  425:        struct ip *ip = NULL;
                    426:        struct ipq *fp;
                    427:        struct in_ifaddr *ia;
                    428:        struct ifaddr *ifa;
1.25      cgd       429:        struct ipqent *ipqe;
1.89      itojun    430:        int hlen = 0, mff, len;
1.100     itojun    431:        int downmatch;
1.165     christos  432:        int checkif;
1.169     itojun    433:        int srcrt = 0;
1.173     jonathan  434: #ifdef FAST_IPSEC
                    435:        struct m_tag *mtag;
                    436:        struct tdb_ident *tdbi;
                    437:        struct secpolicy *sp;
                    438:        int s, error;
                    439: #endif /* FAST_IPSEC */
1.1       cgd       440:
1.164     matt      441:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       442: #ifdef DIAGNOSTIC
                    443:        if ((m->m_flags & M_PKTHDR) == 0)
                    444:                panic("ipintr no HDR");
1.89      itojun    445: #endif
1.164     matt      446:
1.1       cgd       447:        /*
                    448:         * If no IP addresses have been set yet but the interfaces
                    449:         * are receiving, can't do anything with incoming packets yet.
                    450:         */
1.140     matt      451:        if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1       cgd       452:                goto bad;
                    453:        ipstat.ips_total++;
1.154     thorpej   454:        /*
                    455:         * If the IP header is not aligned, slurp it up into a new
                    456:         * mbuf with space for link headers, in the event we forward
                    457:         * it.  Otherwise, if it is aligned, make sure the entire
                    458:         * base IP header is in the first mbuf of the chain.
                    459:         */
                    460:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    461:                if ((m = m_copyup(m, sizeof(struct ip),
                    462:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    463:                        /* XXXJRT new stat, please */
                    464:                        ipstat.ips_toosmall++;
                    465:                        return;
                    466:                }
                    467:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    468:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    469:                        ipstat.ips_toosmall++;
                    470:                        return;
                    471:                }
1.1       cgd       472:        }
                    473:        ip = mtod(m, struct ip *);
1.13      mycroft   474:        if (ip->ip_v != IPVERSION) {
                    475:                ipstat.ips_badvers++;
                    476:                goto bad;
                    477:        }
1.1       cgd       478:        hlen = ip->ip_hl << 2;
                    479:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    480:                ipstat.ips_badhlen++;
                    481:                goto bad;
                    482:        }
                    483:        if (hlen > m->m_len) {
                    484:                if ((m = m_pullup(m, hlen)) == 0) {
                    485:                        ipstat.ips_badhlen++;
1.89      itojun    486:                        return;
1.1       cgd       487:                }
                    488:                ip = mtod(m, struct ip *);
                    489:        }
1.98      thorpej   490:
1.85      hwr       491:        /*
1.99      thorpej   492:         * RFC1122: packets with a multicast source address are
1.98      thorpej   493:         * not allowed.
1.85      hwr       494:         */
                    495:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    496:                ipstat.ips_badaddr++;
1.85      hwr       497:                goto bad;
1.129     itojun    498:        }
                    499:
                    500:        /* 127/8 must not appear on wire - RFC1122 */
                    501:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    502:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    503:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    504:                        ipstat.ips_badaddr++;
1.129     itojun    505:                        goto bad;
1.130     itojun    506:                }
1.85      hwr       507:        }
                    508:
1.135     thorpej   509:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   510:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   511:                 M_CSUM_IPv4_BAD)) {
                    512:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    513:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    514:                goto badcsum;
                    515:
                    516:        case M_CSUM_IPv4:
                    517:                /* Checksum was okay. */
                    518:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    519:                break;
                    520:
                    521:        default:
                    522:                /* Must compute it ourselves. */
                    523:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    524:                if (in_cksum(m, hlen) != 0)
                    525:                        goto bad;
                    526:                break;
1.1       cgd       527:        }
                    528:
1.121     thorpej   529:        /* Retrieve the packet length. */
                    530:        len = ntohs(ip->ip_len);
1.81      proff     531:
                    532:        /*
                    533:         * Check for additional length bogosity
                    534:         */
1.84      proff     535:        if (len < hlen) {
1.81      proff     536:                ipstat.ips_badlen++;
                    537:                goto bad;
                    538:        }
1.1       cgd       539:
                    540:        /*
                    541:         * Check that the amount of data in the buffers
                    542:         * is as at least much as the IP header would have us expect.
                    543:         * Trim mbufs if longer than we expect.
                    544:         * Drop packet if shorter than we expect.
                    545:         */
1.35      mycroft   546:        if (m->m_pkthdr.len < len) {
1.1       cgd       547:                ipstat.ips_tooshort++;
                    548:                goto bad;
                    549:        }
1.35      mycroft   550:        if (m->m_pkthdr.len > len) {
1.1       cgd       551:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   552:                        m->m_len = len;
                    553:                        m->m_pkthdr.len = len;
1.1       cgd       554:                } else
1.35      mycroft   555:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       556:        }
                    557:
1.94      itojun    558: #ifdef IPSEC
1.149     wiz       559:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    560:        m->m_flags &= ~M_CANFASTFWD;
                    561: #else
1.64      thorpej   562:        /*
                    563:         * Assume that we can create a fast-forward IP flow entry
                    564:         * based on this packet.
                    565:         */
                    566:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    567: #endif
1.64      thorpej   568:
1.36      mrg       569: #ifdef PFIL_HOOKS
1.33      mrg       570:        /*
1.64      thorpej   571:         * Run through list of hooks for input packets.  If there are any
                    572:         * filters which require that additional packets in the flow are
                    573:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    574:         * Note that filters must _never_ set this flag, as another filter
                    575:         * in the list may have previously cleared it.
1.33      mrg       576:         */
1.127     itojun    577:        /*
                    578:         * let ipfilter look at packet on the wire,
                    579:         * not the decapsulated packet.
                    580:         */
                    581: #ifdef IPSEC
1.136     itojun    582:        if (!ipsec_getnhist(m))
1.127     itojun    583: #else
                    584:        if (1)
                    585: #endif
                    586:        {
1.169     itojun    587:                struct in_addr odst;
                    588:
                    589:                odst = ip->ip_dst;
1.127     itojun    590:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    591:                    PFIL_IN) != 0)
                    592:                        return;
1.127     itojun    593:                if (m == NULL)
                    594:                        return;
                    595:                ip = mtod(m, struct ip *);
1.142     darrenr   596:                hlen = ip->ip_hl << 2;
1.169     itojun    597:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    598:        }
1.36      mrg       599: #endif /* PFIL_HOOKS */
1.123     thorpej   600:
                    601: #ifdef ALTQ
                    602:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    603:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    604:                /* packet dropped by traffic conditioner */
                    605:                return;
                    606:        }
                    607: #endif
1.121     thorpej   608:
                    609:        /*
1.1       cgd       610:         * Process options and, if not destined for us,
                    611:         * ship it on.  ip_dooptions returns 1 when an
                    612:         * error was detected (causing an icmp message
                    613:         * to be sent and the original packet to be freed).
                    614:         */
                    615:        ip_nhops = 0;           /* for source routed packets */
                    616:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    617:                return;
1.1       cgd       618:
                    619:        /*
1.165     christos  620:         * Enable a consistency check between the destination address
                    621:         * and the arrival interface for a unicast packet (the RFC 1122
                    622:         * strong ES model) if IP forwarding is disabled and the packet
                    623:         * is not locally generated.
                    624:         *
                    625:         * XXX - Checking also should be disabled if the destination
                    626:         * address is ipnat'ed to a different interface.
                    627:         *
                    628:         * XXX - Checking is incompatible with IP aliases added
                    629:         * to the loopback interface instead of the interface where
                    630:         * the packets are received.
                    631:         *
                    632:         * XXX - We need to add a per ifaddr flag for this so that
                    633:         * we get finer grain control.
                    634:         */
                    635:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    636:            (m->m_pkthdr.rcvif != NULL) &&
                    637:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    638:
                    639:        /*
1.1       cgd       640:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    641:         *
                    642:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    643:         * The behavior here is to treat addresses on !IFF_UP interface
                    644:         * as not mine.
1.1       cgd       645:         */
1.100     itojun    646:        downmatch = 0;
1.140     matt      647:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    648:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  649:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    650:                                continue;
1.97      itojun    651:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    652:                                break;
1.100     itojun    653:                        else
                    654:                                downmatch++;
1.97      itojun    655:                }
                    656:        }
1.86      thorpej   657:        if (ia != NULL)
                    658:                goto ours;
1.57      tls       659:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      660:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    661:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    662:                                continue;
1.57      tls       663:                        ia = ifatoia(ifa);
1.35      mycroft   664:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    665:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   666:                            /*
                    667:                             * Look for all-0's host part (old broadcast addr),
                    668:                             * either for subnet or net.
                    669:                             */
                    670:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   671:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       672:                                goto ours;
1.57      tls       673:                        /*
                    674:                         * An interface with IP address zero accepts
                    675:                         * all packets that arrive on that interface.
                    676:                         */
                    677:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    678:                                goto ours;
1.1       cgd       679:                }
                    680:        }
1.18      mycroft   681:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   682:                struct in_multi *inm;
                    683: #ifdef MROUTING
                    684:                extern struct socket *ip_mrouter;
1.10      brezak    685:
1.147     matt      686:                if (M_READONLY(m)) {
1.10      brezak    687:                        if ((m = m_pullup(m, hlen)) == 0) {
                    688:                                ipstat.ips_toosmall++;
1.89      itojun    689:                                return;
1.10      brezak    690:                        }
                    691:                        ip = mtod(m, struct ip *);
                    692:                }
1.4       hpeyerl   693:
                    694:                if (ip_mrouter) {
                    695:                        /*
                    696:                         * If we are acting as a multicast router, all
                    697:                         * incoming multicast packets are passed to the
                    698:                         * kernel-level multicast forwarding function.
                    699:                         * The packet is returned (relatively) intact; if
                    700:                         * ip_mforward() returns a non-zero value, the packet
                    701:                         * must be discarded, else it may be accepted below.
                    702:                         *
                    703:                         * (The IP ident field is put in the same byte order
                    704:                         * as expected when ip_mforward() is called from
                    705:                         * ip_output().)
                    706:                         */
1.13      mycroft   707:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    708:                                ipstat.ips_cantforward++;
1.4       hpeyerl   709:                                m_freem(m);
1.89      itojun    710:                                return;
1.4       hpeyerl   711:                        }
                    712:
                    713:                        /*
                    714:                         * The process-level routing demon needs to receive
                    715:                         * all multicast IGMP packets, whether or not this
                    716:                         * host belongs to their destination groups.
                    717:                         */
                    718:                        if (ip->ip_p == IPPROTO_IGMP)
                    719:                                goto ours;
1.13      mycroft   720:                        ipstat.ips_forward++;
1.4       hpeyerl   721:                }
                    722: #endif
                    723:                /*
                    724:                 * See if we belong to the destination multicast group on the
                    725:                 * arrival interface.
                    726:                 */
                    727:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    728:                if (inm == NULL) {
1.13      mycroft   729:                        ipstat.ips_cantforward++;
1.4       hpeyerl   730:                        m_freem(m);
1.89      itojun    731:                        return;
1.4       hpeyerl   732:                }
                    733:                goto ours;
                    734:        }
1.19      mycroft   735:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   736:            in_nullhost(ip->ip_dst))
1.1       cgd       737:                goto ours;
                    738:
                    739:        /*
                    740:         * Not for us; forward if possible and desirable.
                    741:         */
                    742:        if (ipforwarding == 0) {
                    743:                ipstat.ips_cantforward++;
                    744:                m_freem(m);
1.100     itojun    745:        } else {
                    746:                /*
                    747:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    748:                 * and there's no IFF_UP interface that matches ip_dst,
                    749:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    750:                 * forwarding loop till TTL goes to 0.
                    751:                 */
                    752:                if (downmatch) {
                    753:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    754:                        ipstat.ips_cantforward++;
                    755:                        return;
                    756:                }
1.145     itojun    757: #ifdef IPSEC
                    758:                if (ipsec4_in_reject(m, NULL)) {
                    759:                        ipsecstat.in_polvio++;
                    760:                        goto bad;
                    761:                }
                    762: #endif
1.173     jonathan  763: #ifdef FAST_IPSEC
                    764:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    765:                s = splsoftnet();
                    766:                if (mtag != NULL) {
                    767:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    768:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    769:                } else {
                    770:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    771:                                                   IP_FORWARDING, &error);
                    772:                }
                    773:                if (sp == NULL) {       /* NB: can happen if error */
                    774:                        splx(s);
                    775:                        /*XXX error stat???*/
                    776:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    777:                        goto bad;
                    778:                }
                    779:
                    780:                /*
                    781:                 * Check security policy against packet attributes.
                    782:                 */
                    783:                error = ipsec_in_reject(sp, m);
                    784:                KEY_FREESP(&sp);
                    785:                splx(s);
                    786:                if (error) {
                    787:                        ipstat.ips_cantforward++;
                    788:                        goto bad;
                    789:                }
                    790: #endif /* FAST_IPSEC */
1.145     itojun    791:
1.169     itojun    792:                ip_forward(m, srcrt);
1.100     itojun    793:        }
1.89      itojun    794:        return;
1.1       cgd       795:
                    796: ours:
                    797:        /*
                    798:         * If offset or IP_MF are set, must reassemble.
                    799:         * Otherwise, nothing need be done.
                    800:         * (We could look in the reassembly queue to see
                    801:         * if the packet was previously fragmented,
                    802:         * but it's not worth the time; just let them time out.)
                    803:         */
1.155     itojun    804:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    805:                if (M_READONLY(m)) {
                    806:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    807:                                ipstat.ips_toosmall++;
                    808:                                goto bad;
                    809:                        }
                    810:                        ip = mtod(m, struct ip *);
                    811:                }
                    812:
1.1       cgd       813:                /*
                    814:                 * Look for queue of fragments
                    815:                 * of this datagram.
                    816:                 */
1.75      thorpej   817:                IPQ_LOCK();
1.140     matt      818:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       819:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   820:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    821:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       822:                            ip->ip_p == fp->ipq_p)
                    823:                                goto found;
                    824:                fp = 0;
                    825: found:
                    826:
                    827:                /*
                    828:                 * Adjust ip_len to not reflect header,
1.25      cgd       829:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       830:                 * convert offset of this to bytes.
                    831:                 */
1.155     itojun    832:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    833:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       834:                if (mff) {
1.16      cgd       835:                        /*
                    836:                         * Make sure that fragments have a data length
                    837:                         * that's a non-zero multiple of 8 bytes.
                    838:                         */
1.155     itojun    839:                        if (ntohs(ip->ip_len) == 0 ||
                    840:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       841:                                ipstat.ips_badfrags++;
1.75      thorpej   842:                                IPQ_UNLOCK();
1.16      cgd       843:                                goto bad;
                    844:                        }
                    845:                }
1.155     itojun    846:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       847:
                    848:                /*
                    849:                 * If datagram marked as having more fragments
                    850:                 * or if this is not the first fragment,
                    851:                 * attempt reassembly; if it succeeds, proceed.
                    852:                 */
1.155     itojun    853:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       854:                        ipstat.ips_fragments++;
1.72      thorpej   855:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       856:                        if (ipqe == NULL) {
                    857:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   858:                                IPQ_UNLOCK();
1.25      cgd       859:                                goto bad;
                    860:                        }
                    861:                        ipqe->ipqe_mff = mff;
1.50      thorpej   862:                        ipqe->ipqe_m = m;
1.25      cgd       863:                        ipqe->ipqe_ip = ip;
1.50      thorpej   864:                        m = ip_reass(ipqe, fp);
1.75      thorpej   865:                        if (m == 0) {
                    866:                                IPQ_UNLOCK();
1.89      itojun    867:                                return;
1.75      thorpej   868:                        }
1.13      mycroft   869:                        ipstat.ips_reassembled++;
1.50      thorpej   870:                        ip = mtod(m, struct ip *);
1.74      thorpej   871:                        hlen = ip->ip_hl << 2;
1.155     itojun    872:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       873:                } else
                    874:                        if (fp)
                    875:                                ip_freef(fp);
1.75      thorpej   876:                IPQ_UNLOCK();
1.79      mycroft   877:        }
1.128     itojun    878:
1.173     jonathan  879: #if defined(IPSEC)
1.128     itojun    880:        /*
                    881:         * enforce IPsec policy checking if we are seeing last header.
                    882:         * note that we do not visit this with protocols with pcb layer
                    883:         * code - like udp/tcp/raw ip.
                    884:         */
                    885:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    886:            ipsec4_in_reject(m, NULL)) {
                    887:                ipsecstat.in_polvio++;
                    888:                goto bad;
                    889:        }
                    890: #endif
1.173     jonathan  891: #if FAST_IPSEC
                    892:        /*
                    893:         * enforce IPsec policy checking if we are seeing last header.
                    894:         * note that we do not visit this with protocols with pcb layer
                    895:         * code - like udp/tcp/raw ip.
                    896:         */
                    897:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    898:                /*
                    899:                 * Check if the packet has already had IPsec processing
                    900:                 * done.  If so, then just pass it along.  This tag gets
                    901:                 * set during AH, ESP, etc. input handling, before the
                    902:                 * packet is returned to the ip input queue for delivery.
                    903:                 */
                    904:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    905:                s = splsoftnet();
                    906:                if (mtag != NULL) {
                    907:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    908:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    909:                } else {
                    910:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    911:                                                   IP_FORWARDING, &error);
                    912:                }
                    913:                if (sp != NULL) {
                    914:                        /*
                    915:                         * Check security policy against packet attributes.
                    916:                         */
                    917:                        error = ipsec_in_reject(sp, m);
                    918:                        KEY_FREESP(&sp);
                    919:                } else {
                    920:                        /* XXX error stat??? */
                    921:                        error = EINVAL;
                    922: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    923:                        goto bad;
                    924:                }
                    925:                splx(s);
                    926:                if (error)
                    927:                        goto bad;
                    928:        }
                    929: #endif /* FAST_IPSEC */
1.1       cgd       930:
                    931:        /*
                    932:         * Switch out to protocol's input routine.
                    933:         */
1.82      aidan     934: #if IFA_STATS
1.122     itojun    935:        if (ia && ip)
1.155     itojun    936:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     937: #endif
1.1       cgd       938:        ipstat.ips_delivered++;
1.89      itojun    939:     {
                    940:        int off = hlen, nh = ip->ip_p;
                    941:
                    942:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    943:        return;
                    944:     }
1.1       cgd       945: bad:
                    946:        m_freem(m);
1.135     thorpej   947:        return;
                    948:
                    949: badcsum:
                    950:        ipstat.ips_badsum++;
                    951:        m_freem(m);
1.1       cgd       952: }
                    953:
                    954: /*
                    955:  * Take incoming datagram fragment and try to
                    956:  * reassemble it into whole datagram.  If a chain for
                    957:  * reassembly of this datagram already exists, then it
                    958:  * is given as fp; otherwise have to make a chain.
                    959:  */
1.50      thorpej   960: struct mbuf *
1.25      cgd       961: ip_reass(ipqe, fp)
1.109     augustss  962:        struct ipqent *ipqe;
                    963:        struct ipq *fp;
1.1       cgd       964: {
1.109     augustss  965:        struct mbuf *m = ipqe->ipqe_m;
                    966:        struct ipqent *nq, *p, *q;
1.25      cgd       967:        struct ip *ip;
1.1       cgd       968:        struct mbuf *t;
1.25      cgd       969:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       970:        int i, next;
                    971:
1.75      thorpej   972:        IPQ_LOCK_CHECK();
                    973:
1.1       cgd       974:        /*
                    975:         * Presence of header sizes in mbufs
                    976:         * would confuse code below.
                    977:         */
                    978:        m->m_data += hlen;
                    979:        m->m_len -= hlen;
                    980:
                    981:        /*
                    982:         * If first fragment to arrive, create a reassembly queue.
                    983:         */
                    984:        if (fp == 0) {
1.131     itojun    985:                /*
                    986:                 * Enforce upper bound on number of fragmented packets
                    987:                 * for which we attempt reassembly;
                    988:                 * If maxfrag is 0, never accept fragments.
                    989:                 * If maxfrag is -1, accept all fragments without limitation.
                    990:                 */
                    991:                if (ip_maxfragpackets < 0)
                    992:                        ;
                    993:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    994:                        goto dropfrag;
                    995:                ip_nfragpackets++;
1.50      thorpej   996:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    997:                    M_FTABLE, M_NOWAIT);
                    998:                if (fp == NULL)
1.1       cgd       999:                        goto dropfrag;
1.25      cgd      1000:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd      1001:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1002:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1003:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1004:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1005:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1006:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1007:                p = NULL;
1.1       cgd      1008:                goto insert;
                   1009:        }
                   1010:
                   1011:        /*
                   1012:         * Find a segment which begins after this one does.
                   1013:         */
1.148     matt     1014:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1015:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1016:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1017:                        break;
                   1018:
                   1019:        /*
                   1020:         * If there is a preceding segment, it may provide some of
                   1021:         * our data already.  If so, drop the data from the incoming
                   1022:         * segment.  If it provides all of our data, drop us.
                   1023:         */
1.25      cgd      1024:        if (p != NULL) {
1.155     itojun   1025:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1026:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1027:                if (i > 0) {
1.155     itojun   1028:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1029:                                goto dropfrag;
1.50      thorpej  1030:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1031:                        ipqe->ipqe_ip->ip_off =
                   1032:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1033:                        ipqe->ipqe_ip->ip_len =
                   1034:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1035:                }
                   1036:        }
                   1037:
                   1038:        /*
                   1039:         * While we overlap succeeding segments trim them or,
                   1040:         * if they are completely covered, dequeue them.
                   1041:         */
1.155     itojun   1042:        for (; q != NULL &&
                   1043:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1044:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1045:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1046:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1047:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1048:                        q->ipqe_ip->ip_len =
                   1049:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1050:                        q->ipqe_ip->ip_off =
                   1051:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1052:                        m_adj(q->ipqe_m, i);
1.1       cgd      1053:                        break;
                   1054:                }
1.148     matt     1055:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1056:                m_freem(q->ipqe_m);
1.148     matt     1057:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1058:                pool_put(&ipqent_pool, q);
1.1       cgd      1059:        }
                   1060:
                   1061: insert:
                   1062:        /*
                   1063:         * Stick new segment in its place;
                   1064:         * check for complete reassembly.
                   1065:         */
1.25      cgd      1066:        if (p == NULL) {
1.148     matt     1067:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1068:        } else {
1.148     matt     1069:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1070:        }
1.1       cgd      1071:        next = 0;
1.148     matt     1072:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1073:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1074:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1075:                        return (0);
1.155     itojun   1076:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1077:        }
1.25      cgd      1078:        if (p->ipqe_mff)
1.1       cgd      1079:                return (0);
                   1080:
                   1081:        /*
1.41      thorpej  1082:         * Reassembly is complete.  Check for a bogus message size and
                   1083:         * concatenate fragments.
1.1       cgd      1084:         */
1.148     matt     1085:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1086:        ip = q->ipqe_ip;
1.41      thorpej  1087:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1088:                ipstat.ips_toolong++;
                   1089:                ip_freef(fp);
                   1090:                return (0);
                   1091:        }
1.50      thorpej  1092:        m = q->ipqe_m;
1.1       cgd      1093:        t = m->m_next;
                   1094:        m->m_next = 0;
                   1095:        m_cat(m, t);
1.148     matt     1096:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1097:        pool_put(&ipqent_pool, q);
1.25      cgd      1098:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1099:                t = q->ipqe_m;
1.148     matt     1100:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1101:                pool_put(&ipqent_pool, q);
1.1       cgd      1102:                m_cat(m, t);
                   1103:        }
                   1104:
                   1105:        /*
                   1106:         * Create header for new ip packet by
                   1107:         * modifying header of first packet;
                   1108:         * dequeue and discard fragment reassembly header.
                   1109:         * Make header visible.
                   1110:         */
1.155     itojun   1111:        ip->ip_len = htons(next);
1.25      cgd      1112:        ip->ip_src = fp->ipq_src;
                   1113:        ip->ip_dst = fp->ipq_dst;
                   1114:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1115:        FREE(fp, M_FTABLE);
1.131     itojun   1116:        ip_nfragpackets--;
1.1       cgd      1117:        m->m_len += (ip->ip_hl << 2);
                   1118:        m->m_data -= (ip->ip_hl << 2);
                   1119:        /* some debugging cruft by sklower, below, will go away soon */
                   1120:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1121:                int plen = 0;
1.50      thorpej  1122:                for (t = m; t; t = t->m_next)
                   1123:                        plen += t->m_len;
                   1124:                m->m_pkthdr.len = plen;
1.1       cgd      1125:        }
1.50      thorpej  1126:        return (m);
1.1       cgd      1127:
                   1128: dropfrag:
                   1129:        ipstat.ips_fragdropped++;
                   1130:        m_freem(m);
1.72      thorpej  1131:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1132:        return (0);
                   1133: }
                   1134:
                   1135: /*
                   1136:  * Free a fragment reassembly header and all
                   1137:  * associated datagrams.
                   1138:  */
1.8       mycroft  1139: void
1.1       cgd      1140: ip_freef(fp)
                   1141:        struct ipq *fp;
                   1142: {
1.109     augustss 1143:        struct ipqent *q, *p;
1.1       cgd      1144:
1.75      thorpej  1145:        IPQ_LOCK_CHECK();
                   1146:
1.148     matt     1147:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1148:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1149:                m_freem(q->ipqe_m);
1.148     matt     1150:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1151:                pool_put(&ipqent_pool, q);
1.1       cgd      1152:        }
1.25      cgd      1153:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1154:        FREE(fp, M_FTABLE);
1.131     itojun   1155:        ip_nfragpackets--;
1.1       cgd      1156: }
                   1157:
                   1158: /*
                   1159:  * IP timer processing;
                   1160:  * if a timer expires on a reassembly
                   1161:  * queue, discard it.
                   1162:  */
1.8       mycroft  1163: void
1.1       cgd      1164: ip_slowtimo()
                   1165: {
1.109     augustss 1166:        struct ipq *fp, *nfp;
1.24      mycroft  1167:        int s = splsoftnet();
1.1       cgd      1168:
1.75      thorpej  1169:        IPQ_LOCK();
1.140     matt     1170:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1171:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1172:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1173:                        ipstat.ips_fragtimeout++;
1.25      cgd      1174:                        ip_freef(fp);
1.1       cgd      1175:                }
                   1176:        }
1.131     itojun   1177:        /*
                   1178:         * If we are over the maximum number of fragments
                   1179:         * (due to the limit being lowered), drain off
                   1180:         * enough to get down to the new limit.
                   1181:         */
                   1182:        if (ip_maxfragpackets < 0)
                   1183:                ;
                   1184:        else {
1.140     matt     1185:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1186:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1187:        }
1.75      thorpej  1188:        IPQ_UNLOCK();
1.63      matt     1189: #ifdef GATEWAY
                   1190:        ipflow_slowtimo();
                   1191: #endif
1.1       cgd      1192:        splx(s);
                   1193: }
                   1194:
                   1195: /*
                   1196:  * Drain off all datagram fragments.
                   1197:  */
1.8       mycroft  1198: void
1.1       cgd      1199: ip_drain()
                   1200: {
                   1201:
1.75      thorpej  1202:        /*
                   1203:         * We may be called from a device's interrupt context.  If
                   1204:         * the ipq is already busy, just bail out now.
                   1205:         */
                   1206:        if (ipq_lock_try() == 0)
                   1207:                return;
                   1208:
1.140     matt     1209:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1210:                ipstat.ips_fragdropped++;
1.140     matt     1211:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1212:        }
1.75      thorpej  1213:
                   1214:        IPQ_UNLOCK();
1.1       cgd      1215: }
                   1216:
                   1217: /*
                   1218:  * Do option processing on a datagram,
                   1219:  * possibly discarding it if bad options are encountered,
                   1220:  * or forwarding it if source-routed.
                   1221:  * Returns 1 if packet has been forwarded/freed,
                   1222:  * 0 if the packet should be processed further.
                   1223:  */
1.8       mycroft  1224: int
1.1       cgd      1225: ip_dooptions(m)
                   1226:        struct mbuf *m;
                   1227: {
1.109     augustss 1228:        struct ip *ip = mtod(m, struct ip *);
                   1229:        u_char *cp, *cp0;
                   1230:        struct ip_timestamp *ipt;
                   1231:        struct in_ifaddr *ia;
1.1       cgd      1232:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1233:        struct in_addr dst;
1.1       cgd      1234:        n_time ntime;
                   1235:
1.13      mycroft  1236:        dst = ip->ip_dst;
1.1       cgd      1237:        cp = (u_char *)(ip + 1);
                   1238:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1239:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1240:                opt = cp[IPOPT_OPTVAL];
                   1241:                if (opt == IPOPT_EOL)
                   1242:                        break;
                   1243:                if (opt == IPOPT_NOP)
                   1244:                        optlen = 1;
                   1245:                else {
1.113     itojun   1246:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1247:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1248:                                goto bad;
                   1249:                        }
1.1       cgd      1250:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1251:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1252:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1253:                                goto bad;
                   1254:                        }
                   1255:                }
                   1256:                switch (opt) {
                   1257:
                   1258:                default:
                   1259:                        break;
                   1260:
                   1261:                /*
                   1262:                 * Source routing with record.
                   1263:                 * Find interface with current destination address.
                   1264:                 * If none on this machine then drop if strictly routed,
                   1265:                 * or do nothing if loosely routed.
                   1266:                 * Record interface address and bring up next address
                   1267:                 * component.  If strictly routed make sure next
                   1268:                 * address is on directly accessible net.
                   1269:                 */
                   1270:                case IPOPT_LSRR:
                   1271:                case IPOPT_SSRR:
1.47      cjs      1272:                        if (ip_allowsrcrt == 0) {
                   1273:                                type = ICMP_UNREACH;
                   1274:                                code = ICMP_UNREACH_NET_PROHIB;
                   1275:                                goto bad;
                   1276:                        }
1.114     itojun   1277:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1278:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1279:                                goto bad;
                   1280:                        }
1.1       cgd      1281:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1282:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1283:                                goto bad;
                   1284:                        }
                   1285:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1286:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1287:                        if (ia == 0) {
                   1288:                                if (opt == IPOPT_SSRR) {
                   1289:                                        type = ICMP_UNREACH;
                   1290:                                        code = ICMP_UNREACH_SRCFAIL;
                   1291:                                        goto bad;
                   1292:                                }
                   1293:                                /*
                   1294:                                 * Loose routing, and not at next destination
                   1295:                                 * yet; nothing to do except forward.
                   1296:                                 */
                   1297:                                break;
                   1298:                        }
                   1299:                        off--;                  /* 0 origin */
1.112     sommerfe 1300:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1301:                                /*
                   1302:                                 * End of source route.  Should be for us.
                   1303:                                 */
                   1304:                                save_rte(cp, ip->ip_src);
                   1305:                                break;
                   1306:                        }
                   1307:                        /*
                   1308:                         * locate outgoing interface
                   1309:                         */
                   1310:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1311:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1312:                        if (opt == IPOPT_SSRR)
                   1313:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1314:                        else
1.1       cgd      1315:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1316:                        if (ia == 0) {
                   1317:                                type = ICMP_UNREACH;
                   1318:                                code = ICMP_UNREACH_SRCFAIL;
                   1319:                                goto bad;
                   1320:                        }
                   1321:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1322:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1323:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1324:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1325:                        /*
                   1326:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1327:                         */
1.18      mycroft  1328:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1329:                        break;
                   1330:
                   1331:                case IPOPT_RR:
1.114     itojun   1332:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1333:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1334:                                goto bad;
                   1335:                        }
1.1       cgd      1336:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1337:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1338:                                goto bad;
                   1339:                        }
                   1340:                        /*
                   1341:                         * If no space remains, ignore.
                   1342:                         */
                   1343:                        off--;                  /* 0 origin */
1.112     sommerfe 1344:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1345:                                break;
                   1346:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1347:                            sizeof(ipaddr.sin_addr));
                   1348:                        /*
                   1349:                         * locate outgoing interface; if we're the destination,
                   1350:                         * use the incoming interface (should be same).
                   1351:                         */
1.96      thorpej  1352:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1353:                            == NULL &&
                   1354:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1355:                                type = ICMP_UNREACH;
                   1356:                                code = ICMP_UNREACH_HOST;
                   1357:                                goto bad;
                   1358:                        }
1.20      mycroft  1359:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1360:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1361:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1362:                        break;
                   1363:
                   1364:                case IPOPT_TS:
                   1365:                        code = cp - (u_char *)ip;
                   1366:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1367:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1368:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1369:                                goto bad;
1.114     itojun   1370:                        }
                   1371:                        if (ipt->ipt_ptr < 5) {
                   1372:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1373:                                goto bad;
                   1374:                        }
1.15      cgd      1375:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1376:                                if (++ipt->ipt_oflw == 0) {
                   1377:                                        code = (u_char *)&ipt->ipt_ptr -
                   1378:                                            (u_char *)ip;
1.1       cgd      1379:                                        goto bad;
1.114     itojun   1380:                                }
1.1       cgd      1381:                                break;
                   1382:                        }
1.104     thorpej  1383:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1384:                        switch (ipt->ipt_flg) {
                   1385:
                   1386:                        case IPOPT_TS_TSONLY:
                   1387:                                break;
                   1388:
                   1389:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1390:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1391:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1392:                                        code = (u_char *)&ipt->ipt_ptr -
                   1393:                                            (u_char *)ip;
1.1       cgd      1394:                                        goto bad;
1.114     itojun   1395:                                }
1.13      mycroft  1396:                                ipaddr.sin_addr = dst;
1.96      thorpej  1397:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1398:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1399:                                if (ia == 0)
                   1400:                                        continue;
1.104     thorpej  1401:                                bcopy(&ia->ia_addr.sin_addr,
                   1402:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1403:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1404:                                break;
                   1405:
                   1406:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1407:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1408:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1409:                                        code = (u_char *)&ipt->ipt_ptr -
                   1410:                                            (u_char *)ip;
1.1       cgd      1411:                                        goto bad;
1.114     itojun   1412:                                }
1.104     thorpej  1413:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1414:                                    sizeof(struct in_addr));
1.96      thorpej  1415:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1416:                                    == NULL)
1.1       cgd      1417:                                        continue;
                   1418:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1419:                                break;
                   1420:
                   1421:                        default:
1.114     itojun   1422:                                /* XXX can't take &ipt->ipt_flg */
                   1423:                                code = (u_char *)&ipt->ipt_ptr -
                   1424:                                    (u_char *)ip + 1;
1.1       cgd      1425:                                goto bad;
                   1426:                        }
                   1427:                        ntime = iptime();
1.107     thorpej  1428:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1429:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1430:                            sizeof(n_time));
                   1431:                        ipt->ipt_ptr += sizeof(n_time);
                   1432:                }
                   1433:        }
                   1434:        if (forward) {
1.26      thorpej  1435:                if (ip_forwsrcrt == 0) {
                   1436:                        type = ICMP_UNREACH;
                   1437:                        code = ICMP_UNREACH_SRCFAIL;
                   1438:                        goto bad;
                   1439:                }
1.1       cgd      1440:                ip_forward(m, 1);
                   1441:                return (1);
1.13      mycroft  1442:        }
                   1443:        return (0);
1.1       cgd      1444: bad:
1.13      mycroft  1445:        icmp_error(m, type, code, 0, 0);
                   1446:        ipstat.ips_badoptions++;
1.1       cgd      1447:        return (1);
                   1448: }
                   1449:
                   1450: /*
                   1451:  * Given address of next destination (final or next hop),
                   1452:  * return internet address info of interface to be used to get there.
                   1453:  */
                   1454: struct in_ifaddr *
                   1455: ip_rtaddr(dst)
                   1456:         struct in_addr dst;
                   1457: {
1.109     augustss 1458:        struct sockaddr_in *sin;
1.1       cgd      1459:
1.19      mycroft  1460:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1461:
1.35      mycroft  1462:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1463:                if (ipforward_rt.ro_rt) {
                   1464:                        RTFREE(ipforward_rt.ro_rt);
                   1465:                        ipforward_rt.ro_rt = 0;
                   1466:                }
                   1467:                sin->sin_family = AF_INET;
                   1468:                sin->sin_len = sizeof(*sin);
                   1469:                sin->sin_addr = dst;
                   1470:
                   1471:                rtalloc(&ipforward_rt);
                   1472:        }
                   1473:        if (ipforward_rt.ro_rt == 0)
                   1474:                return ((struct in_ifaddr *)0);
1.19      mycroft  1475:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1476: }
                   1477:
                   1478: /*
                   1479:  * Save incoming source route for use in replies,
                   1480:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1481:  */
1.13      mycroft  1482: void
1.1       cgd      1483: save_rte(option, dst)
                   1484:        u_char *option;
                   1485:        struct in_addr dst;
                   1486: {
                   1487:        unsigned olen;
                   1488:
                   1489:        olen = option[IPOPT_OLEN];
                   1490: #ifdef DIAGNOSTIC
                   1491:        if (ipprintfs)
1.39      christos 1492:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1493: #endif /* 0 */
1.1       cgd      1494:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1495:                return;
                   1496:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1497:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1498:        ip_srcrt.dst = dst;
                   1499: }
                   1500:
                   1501: /*
                   1502:  * Retrieve incoming source route for use in replies,
                   1503:  * in the same form used by setsockopt.
                   1504:  * The first hop is placed before the options, will be removed later.
                   1505:  */
                   1506: struct mbuf *
                   1507: ip_srcroute()
                   1508: {
1.109     augustss 1509:        struct in_addr *p, *q;
                   1510:        struct mbuf *m;
1.1       cgd      1511:
                   1512:        if (ip_nhops == 0)
                   1513:                return ((struct mbuf *)0);
                   1514:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1515:        if (m == 0)
                   1516:                return ((struct mbuf *)0);
                   1517:
1.164     matt     1518:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1519: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1520:
                   1521:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1522:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1523:            OPTSIZ;
                   1524: #ifdef DIAGNOSTIC
                   1525:        if (ipprintfs)
1.39      christos 1526:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1527: #endif
                   1528:
                   1529:        /*
                   1530:         * First save first hop for return route
                   1531:         */
                   1532:        p = &ip_srcrt.route[ip_nhops - 1];
                   1533:        *(mtod(m, struct in_addr *)) = *p--;
                   1534: #ifdef DIAGNOSTIC
                   1535:        if (ipprintfs)
1.39      christos 1536:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1537: #endif
                   1538:
                   1539:        /*
                   1540:         * Copy option fields and padding (nop) to mbuf.
                   1541:         */
                   1542:        ip_srcrt.nop = IPOPT_NOP;
                   1543:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1544:        bcopy((caddr_t)&ip_srcrt.nop,
                   1545:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1546:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1547:            sizeof(struct in_addr) + OPTSIZ);
                   1548: #undef OPTSIZ
                   1549:        /*
                   1550:         * Record return path as an IP source route,
                   1551:         * reversing the path (pointers are now aligned).
                   1552:         */
                   1553:        while (p >= ip_srcrt.route) {
                   1554: #ifdef DIAGNOSTIC
                   1555:                if (ipprintfs)
1.39      christos 1556:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1557: #endif
                   1558:                *q++ = *p--;
                   1559:        }
                   1560:        /*
                   1561:         * Last hop goes to final destination.
                   1562:         */
                   1563:        *q = ip_srcrt.dst;
                   1564: #ifdef DIAGNOSTIC
                   1565:        if (ipprintfs)
1.39      christos 1566:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1567: #endif
                   1568:        return (m);
                   1569: }
                   1570:
                   1571: /*
                   1572:  * Strip out IP options, at higher
                   1573:  * level protocol in the kernel.
                   1574:  * Second argument is buffer to which options
                   1575:  * will be moved, and return value is their length.
                   1576:  * XXX should be deleted; last arg currently ignored.
                   1577:  */
1.8       mycroft  1578: void
1.1       cgd      1579: ip_stripoptions(m, mopt)
1.109     augustss 1580:        struct mbuf *m;
1.1       cgd      1581:        struct mbuf *mopt;
                   1582: {
1.109     augustss 1583:        int i;
1.1       cgd      1584:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1585:        caddr_t opts;
1.1       cgd      1586:        int olen;
                   1587:
1.79      mycroft  1588:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1589:        opts = (caddr_t)(ip + 1);
                   1590:        i = m->m_len - (sizeof (struct ip) + olen);
                   1591:        bcopy(opts  + olen, opts, (unsigned)i);
                   1592:        m->m_len -= olen;
                   1593:        if (m->m_flags & M_PKTHDR)
                   1594:                m->m_pkthdr.len -= olen;
1.155     itojun   1595:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1596:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1597: }
                   1598:
1.139     matt     1599: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1600:        0,              0,              0,              0,
                   1601:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1602:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1603:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1604:        0,              0,              0,              0,
                   1605:        ENOPROTOOPT
                   1606: };
                   1607:
                   1608: /*
                   1609:  * Forward a packet.  If some error occurs return the sender
                   1610:  * an icmp packet.  Note we can't always generate a meaningful
                   1611:  * icmp message because icmp doesn't have a large enough repertoire
                   1612:  * of codes and types.
                   1613:  *
                   1614:  * If not forwarding, just drop the packet.  This could be confusing
                   1615:  * if ipforwarding was zero but some routing protocol was advancing
                   1616:  * us as a gateway to somewhere.  However, we must let the routing
                   1617:  * protocol deal with that.
                   1618:  *
                   1619:  * The srcrt parameter indicates whether the packet is being forwarded
                   1620:  * via a source route.
                   1621:  */
1.13      mycroft  1622: void
1.1       cgd      1623: ip_forward(m, srcrt)
                   1624:        struct mbuf *m;
                   1625:        int srcrt;
                   1626: {
1.109     augustss 1627:        struct ip *ip = mtod(m, struct ip *);
                   1628:        struct sockaddr_in *sin;
                   1629:        struct rtentry *rt;
1.28      christos 1630:        int error, type = 0, code = 0;
1.1       cgd      1631:        struct mbuf *mcopy;
1.13      mycroft  1632:        n_long dest;
                   1633:        struct ifnet *destifp;
1.173     jonathan 1634: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1635:        struct ifnet dummyifp;
                   1636: #endif
1.164     matt     1637:
                   1638:        /*
                   1639:         * We are now in the output path.
                   1640:         */
                   1641:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1642:
                   1643:        /*
                   1644:         * Clear any in-bound checksum flags for this packet.
                   1645:         */
                   1646:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1647:
1.13      mycroft  1648:        dest = 0;
1.1       cgd      1649: #ifdef DIAGNOSTIC
                   1650:        if (ipprintfs)
1.70      thorpej  1651:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1652:                    ntohl(ip->ip_src.s_addr),
                   1653:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1654: #endif
1.93      sommerfe 1655:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1656:                ipstat.ips_cantforward++;
                   1657:                m_freem(m);
                   1658:                return;
                   1659:        }
                   1660:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1661:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1662:                return;
                   1663:        }
                   1664:        ip->ip_ttl -= IPTTLDEC;
                   1665:
1.19      mycroft  1666:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1667:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1668:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1669:                if (ipforward_rt.ro_rt) {
                   1670:                        RTFREE(ipforward_rt.ro_rt);
                   1671:                        ipforward_rt.ro_rt = 0;
                   1672:                }
                   1673:                sin->sin_family = AF_INET;
1.35      mycroft  1674:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1675:                sin->sin_addr = ip->ip_dst;
                   1676:
                   1677:                rtalloc(&ipforward_rt);
                   1678:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1679:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1680:                        return;
                   1681:                }
                   1682:                rt = ipforward_rt.ro_rt;
                   1683:        }
                   1684:
                   1685:        /*
1.34      mycroft  1686:         * Save at most 68 bytes of the packet in case
1.1       cgd      1687:         * we need to generate an ICMP message to the src.
1.119     itojun   1688:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1689:         */
1.155     itojun   1690:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1691:        if (mcopy)
                   1692:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1693:
                   1694:        /*
                   1695:         * If forwarding packet using same interface that it came in on,
                   1696:         * perhaps should send a redirect to sender to shortcut a hop.
                   1697:         * Only send redirect if source is sending directly to us,
                   1698:         * and if packet was not source routed (or has any options).
                   1699:         * Also, don't send redirect if forwarding using a default route
                   1700:         * or a route modified by a redirect.
                   1701:         */
                   1702:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1703:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1704:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1705:            ipsendredirects && !srcrt) {
1.19      mycroft  1706:                if (rt->rt_ifa &&
                   1707:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1708:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1709:                        if (rt->rt_flags & RTF_GATEWAY)
                   1710:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1711:                        else
                   1712:                                dest = ip->ip_dst.s_addr;
                   1713:                        /*
                   1714:                         * Router requirements says to only send host
                   1715:                         * redirects.
                   1716:                         */
                   1717:                        type = ICMP_REDIRECT;
                   1718:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1719: #ifdef DIAGNOSTIC
1.77      thorpej  1720:                        if (ipprintfs)
                   1721:                                printf("redirect (%d) to %x\n", code,
                   1722:                                    (u_int32_t)dest);
1.1       cgd      1723: #endif
                   1724:                }
                   1725:        }
                   1726:
1.27      thorpej  1727:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1728:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1729:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1730:
1.1       cgd      1731:        if (error)
                   1732:                ipstat.ips_cantforward++;
                   1733:        else {
                   1734:                ipstat.ips_forward++;
                   1735:                if (type)
                   1736:                        ipstat.ips_redirectsent++;
                   1737:                else {
1.63      matt     1738:                        if (mcopy) {
                   1739: #ifdef GATEWAY
1.64      thorpej  1740:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1741:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1742: #endif
1.1       cgd      1743:                                m_freem(mcopy);
1.63      matt     1744:                        }
1.1       cgd      1745:                        return;
                   1746:                }
                   1747:        }
                   1748:        if (mcopy == NULL)
                   1749:                return;
1.13      mycroft  1750:        destifp = NULL;
                   1751:
1.1       cgd      1752:        switch (error) {
                   1753:
                   1754:        case 0:                         /* forwarded, but need redirect */
                   1755:                /* type, code set above */
                   1756:                break;
                   1757:
                   1758:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1759:        case EHOSTUNREACH:
                   1760:        case ENETDOWN:
                   1761:        case EHOSTDOWN:
                   1762:        default:
                   1763:                type = ICMP_UNREACH;
                   1764:                code = ICMP_UNREACH_HOST;
                   1765:                break;
                   1766:
                   1767:        case EMSGSIZE:
                   1768:                type = ICMP_UNREACH;
                   1769:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1770: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1771:                if (ipforward_rt.ro_rt)
                   1772:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1773: #else
                   1774:                /*
                   1775:                 * If the packet is routed over IPsec tunnel, tell the
                   1776:                 * originator the tunnel MTU.
                   1777:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1778:                 * XXX quickhack!!!
                   1779:                 */
                   1780:                if (ipforward_rt.ro_rt) {
                   1781:                        struct secpolicy *sp;
                   1782:                        int ipsecerror;
1.95      itojun   1783:                        size_t ipsechdr;
1.89      itojun   1784:                        struct route *ro;
                   1785:
                   1786:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1787:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1788:                            &ipsecerror);
1.89      itojun   1789:
                   1790:                        if (sp == NULL)
                   1791:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1792:                        else {
                   1793:                                /* count IPsec header size */
1.95      itojun   1794:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1795:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1796:
                   1797:                                /*
                   1798:                                 * find the correct route for outer IPv4
                   1799:                                 * header, compute tunnel MTU.
                   1800:                                 *
                   1801:                                 * XXX BUG ALERT
                   1802:                                 * The "dummyifp" code relies upon the fact
                   1803:                                 * that icmp_error() touches only ifp->if_mtu.
                   1804:                                 */
                   1805:                                /*XXX*/
                   1806:                                destifp = NULL;
                   1807:                                if (sp->req != NULL
1.95      itojun   1808:                                 && sp->req->sav != NULL
                   1809:                                 && sp->req->sav->sah != NULL) {
                   1810:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1811:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1812:                                                dummyifp.if_mtu =
1.151     itojun   1813:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1814:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1815:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1816:                                                dummyifp.if_mtu -= ipsechdr;
                   1817:                                                destifp = &dummyifp;
                   1818:                                        }
                   1819:                                }
                   1820:
1.173     jonathan 1821: #ifdef IPSEC
1.89      itojun   1822:                                key_freesp(sp);
1.173     jonathan 1823: #else
                   1824:                                KEY_FREESP(&sp);
                   1825: #endif
1.89      itojun   1826:                        }
                   1827:                }
                   1828: #endif /*IPSEC*/
1.1       cgd      1829:                ipstat.ips_cantfrag++;
                   1830:                break;
                   1831:
                   1832:        case ENOBUFS:
1.143     itojun   1833: #if 1
                   1834:                /*
                   1835:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1836:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1837:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1838:                 * or if the underlying interface is rate-limited.
1.143     itojun   1839:                 */
                   1840:                if (mcopy)
                   1841:                        m_freem(mcopy);
                   1842:                return;
                   1843: #else
1.1       cgd      1844:                type = ICMP_SOURCEQUENCH;
                   1845:                code = 0;
                   1846:                break;
1.143     itojun   1847: #endif
1.1       cgd      1848:        }
1.13      mycroft  1849:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1850: }
                   1851:
                   1852: void
                   1853: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1854:        struct inpcb *inp;
                   1855:        struct mbuf **mp;
                   1856:        struct ip *ip;
                   1857:        struct mbuf *m;
1.44      thorpej  1858: {
                   1859:
                   1860:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1861:                struct timeval tv;
                   1862:
                   1863:                microtime(&tv);
                   1864:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1865:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1866:                if (*mp)
                   1867:                        mp = &(*mp)->m_next;
                   1868:        }
                   1869:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1870:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1871:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1872:                if (*mp)
                   1873:                        mp = &(*mp)->m_next;
                   1874:        }
                   1875: #ifdef notyet
                   1876:        /*
                   1877:         * XXX
                   1878:         * Moving these out of udp_input() made them even more broken
                   1879:         * than they already were.
                   1880:         *      - fenner@parc.xerox.com
                   1881:         */
                   1882:        /* options were tossed already */
                   1883:        if (inp->inp_flags & INP_RECVOPTS) {
                   1884:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1885:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1886:                if (*mp)
                   1887:                        mp = &(*mp)->m_next;
                   1888:        }
                   1889:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1890:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1891:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1892:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1893:                if (*mp)
                   1894:                        mp = &(*mp)->m_next;
                   1895:        }
                   1896: #endif
                   1897:        if (inp->inp_flags & INP_RECVIF) {
                   1898:                struct sockaddr_dl sdl;
                   1899:
                   1900:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1901:                sdl.sdl_family = AF_LINK;
                   1902:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1903:                    m->m_pkthdr.rcvif->if_index : 0;
                   1904:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1905:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1906:                    IP_RECVIF, IPPROTO_IP);
                   1907:                if (*mp)
                   1908:                        mp = &(*mp)->m_next;
                   1909:        }
1.13      mycroft  1910: }
                   1911:
                   1912: int
                   1913: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1914:        int *name;
                   1915:        u_int namelen;
                   1916:        void *oldp;
                   1917:        size_t *oldlenp;
                   1918:        void *newp;
                   1919:        size_t newlen;
                   1920: {
1.88      sommerfe 1921:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1922:
1.54      lukem    1923:        int error, old;
                   1924:
1.13      mycroft  1925:        /* All sysctl names at this level are terminal. */
                   1926:        if (namelen != 1)
                   1927:                return (ENOTDIR);
                   1928:
                   1929:        switch (name[0]) {
                   1930:        case IPCTL_FORWARDING:
                   1931:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1932:        case IPCTL_SENDREDIRECTS:
                   1933:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1934:                        &ipsendredirects));
                   1935:        case IPCTL_DEFTTL:
                   1936:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1937: #ifdef notyet
                   1938:        case IPCTL_DEFMTU:
                   1939:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1940: #endif
1.26      thorpej  1941:        case IPCTL_FORWSRCRT:
1.47      cjs      1942:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1943:                if (securelevel > 0)
1.46      cjs      1944:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1945:                            ip_forwsrcrt));
                   1946:                else
                   1947:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1948:                            &ip_forwsrcrt));
1.27      thorpej  1949:        case IPCTL_DIRECTEDBCAST:
                   1950:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1951:                    &ip_directedbcast));
1.47      cjs      1952:        case IPCTL_ALLOWSRCRT:
                   1953:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1954:                    &ip_allowsrcrt));
1.52      thorpej  1955:        case IPCTL_SUBNETSARELOCAL:
                   1956:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1957:                    &subnetsarelocal));
1.53      kml      1958:        case IPCTL_MTUDISC:
1.60      kml      1959:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1960:                    &ip_mtudisc);
1.163     itojun   1961:                if (error == 0 && ip_mtudisc == 0)
                   1962:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1963:                return error;
1.54      lukem    1964:        case IPCTL_ANONPORTMIN:
                   1965:                old = anonportmin;
                   1966:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1967:                if (anonportmin >= anonportmax || anonportmin < 0
                   1968:                    || anonportmin > 65535
1.54      lukem    1969: #ifndef IPNOPRIVPORTS
                   1970:                    || anonportmin < IPPORT_RESERVED
                   1971: #endif
                   1972:                    ) {
                   1973:                        anonportmin = old;
                   1974:                        return (EINVAL);
                   1975:                }
                   1976:                return (error);
                   1977:        case IPCTL_ANONPORTMAX:
                   1978:                old = anonportmax;
                   1979:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1980:                if (anonportmin >= anonportmax || anonportmax < 0
                   1981:                    || anonportmax > 65535
1.54      lukem    1982: #ifndef IPNOPRIVPORTS
                   1983:                    || anonportmax < IPPORT_RESERVED
                   1984: #endif
                   1985:                    ) {
                   1986:                        anonportmax = old;
                   1987:                        return (EINVAL);
                   1988:                }
1.60      kml      1989:                return (error);
                   1990:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   1991:                old = ip_mtudisc_timeout;
1.60      kml      1992:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1993:                   &ip_mtudisc_timeout);
1.158     itojun   1994:                if (ip_mtudisc_timeout < 0) {
                   1995:                        ip_mtudisc_timeout = old;
1.156     itojun   1996:                        return (EINVAL);
1.158     itojun   1997:                }
1.163     itojun   1998:                if (error == 0)
1.162     itojun   1999:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   2000:                                              ip_mtudisc_timeout);
1.54      lukem    2001:                return (error);
1.65      matt     2002: #ifdef GATEWAY
                   2003:        case IPCTL_MAXFLOWS:
1.67      thorpej  2004:            {
                   2005:                int s;
                   2006:
1.65      matt     2007:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   2008:                   &ip_maxflows);
1.67      thorpej  2009:                s = splsoftnet();
1.65      matt     2010:                ipflow_reap(0);
1.67      thorpej  2011:                splx(s);
1.65      matt     2012:                return (error);
1.67      thorpej  2013:            }
1.89      itojun   2014: #endif
1.90      itojun   2015:        case IPCTL_HOSTZEROBROADCAST:
                   2016:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2017:                    &hostzeroisbroadcast));
1.89      itojun   2018: #if NGIF > 0
                   2019:        case IPCTL_GIF_TTL:
1.157     itojun   2020:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   2021:                                  &ip_gif_ttl));
1.144     martin   2022: #endif
                   2023:
                   2024: #if NGRE > 0
                   2025:        case IPCTL_GRE_TTL:
1.157     itojun   2026:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   2027:                                  &ip_gre_ttl));
1.117     tron     2028: #endif
                   2029:
                   2030: #ifndef IPNOPRIVPORTS
                   2031:        case IPCTL_LOWPORTMIN:
                   2032:                old = lowportmin;
                   2033:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   2034:                if (lowportmin >= lowportmax
                   2035:                    || lowportmin > IPPORT_RESERVEDMAX
                   2036:                    || lowportmin < IPPORT_RESERVEDMIN
                   2037:                    ) {
                   2038:                        lowportmin = old;
                   2039:                        return (EINVAL);
                   2040:                }
                   2041:                return (error);
                   2042:        case IPCTL_LOWPORTMAX:
                   2043:                old = lowportmax;
                   2044:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   2045:                if (lowportmin >= lowportmax
                   2046:                    || lowportmax > IPPORT_RESERVEDMAX
                   2047:                    || lowportmax < IPPORT_RESERVEDMIN
                   2048:                    ) {
                   2049:                        lowportmax = old;
                   2050:                        return (EINVAL);
                   2051:                }
                   2052:                return (error);
1.65      matt     2053: #endif
1.131     itojun   2054:
                   2055:        case IPCTL_MAXFRAGPACKETS:
                   2056:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2057:                    &ip_maxfragpackets));
1.88      sommerfe 2058:
1.165     christos 2059:        case IPCTL_CHECKINTERFACE:
                   2060:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2061:                    &ip_checkinterface));
1.13      mycroft  2062:        default:
                   2063:                return (EOPNOTSUPP);
                   2064:        }
                   2065:        /* NOTREACHED */
1.1       cgd      2066: }

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