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Annotation of src/sys/netinet/ip_input.c, Revision 1.169

1.169   ! itojun      1: /*     $NetBSD: ip_input.c,v 1.168 2003/06/30 01:21:11 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.
                     81:  * 3. All advertising materials mentioning features or use of this software
                     82:  *    must display the following acknowledgement:
                     83:  *     This product includes software developed by the University of
                     84:  *     California, Berkeley and its contributors.
                     85:  * 4. Neither the name of the University nor the names of its contributors
                     86:  *    may be used to endorse or promote products derived from this software
                     87:  *    without specific prior written permission.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     90:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     91:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     92:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     93:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     94:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     95:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     96:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     97:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     98:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     99:  * SUCH DAMAGE.
                    100:  *
1.14      cgd       101:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd       102:  */
1.141     lukem     103:
                    104: #include <sys/cdefs.h>
1.169   ! itojun    105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.168 2003/06/30 01:21:11 itojun Exp $");
1.55      scottr    106:
1.62      matt      107: #include "opt_gateway.h"
1.69      mrg       108: #include "opt_pfil_hooks.h"
1.91      thorpej   109: #include "opt_ipsec.h"
1.55      scottr    110: #include "opt_mrouting.h"
1.167     martin    111: #include "opt_mbuftrace.h"
1.135     thorpej   112: #include "opt_inet_csum.h"
1.1       cgd       113:
1.5       mycroft   114: #include <sys/param.h>
                    115: #include <sys/systm.h>
                    116: #include <sys/malloc.h>
                    117: #include <sys/mbuf.h>
                    118: #include <sys/domain.h>
                    119: #include <sys/protosw.h>
                    120: #include <sys/socket.h>
1.44      thorpej   121: #include <sys/socketvar.h>
1.5       mycroft   122: #include <sys/errno.h>
                    123: #include <sys/time.h>
                    124: #include <sys/kernel.h>
1.72      thorpej   125: #include <sys/pool.h>
1.28      christos  126: #include <sys/sysctl.h>
1.1       cgd       127:
1.5       mycroft   128: #include <net/if.h>
1.44      thorpej   129: #include <net/if_dl.h>
1.5       mycroft   130: #include <net/route.h>
1.45      mrg       131: #include <net/pfil.h>
1.1       cgd       132:
1.5       mycroft   133: #include <netinet/in.h>
                    134: #include <netinet/in_systm.h>
                    135: #include <netinet/ip.h>
                    136: #include <netinet/in_pcb.h>
                    137: #include <netinet/in_var.h>
                    138: #include <netinet/ip_var.h>
                    139: #include <netinet/ip_icmp.h>
1.89      itojun    140: /* just for gif_ttl */
                    141: #include <netinet/in_gif.h>
                    142: #include "gif.h"
1.144     martin    143: #include <net/if_gre.h>
                    144: #include "gre.h"
1.111     jdolecek  145:
                    146: #ifdef MROUTING
                    147: #include <netinet/ip_mroute.h>
                    148: #endif
1.89      itojun    149:
                    150: #ifdef IPSEC
                    151: #include <netinet6/ipsec.h>
                    152: #include <netkey/key.h>
                    153: #endif
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_multihead in_multi;
                    227: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   228: struct ifqueue ipintrq;
1.63      matt      229: struct ipstat  ipstat;
                    230: u_int16_t      ip_id;
1.75      thorpej   231:
1.121     thorpej   232: #ifdef PFIL_HOOKS
                    233: struct pfil_head inet_pfil_hook;
                    234: #endif
                    235:
1.63      matt      236: struct ipqhead ipq;
1.75      thorpej   237: int    ipq_locked;
1.131     itojun    238: int    ip_nfragpackets = 0;
1.133     itojun    239: int    ip_maxfragpackets = 200;
1.75      thorpej   240:
                    241: static __inline int ipq_lock_try __P((void));
                    242: static __inline void ipq_unlock __P((void));
                    243:
                    244: static __inline int
                    245: ipq_lock_try()
                    246: {
                    247:        int s;
                    248:
1.132     thorpej   249:        /*
1.149     wiz       250:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   251:         * mbuf allocation.
                    252:         */
                    253:        s = splvm();
1.75      thorpej   254:        if (ipq_locked) {
                    255:                splx(s);
                    256:                return (0);
                    257:        }
                    258:        ipq_locked = 1;
                    259:        splx(s);
                    260:        return (1);
                    261: }
                    262:
                    263: static __inline void
                    264: ipq_unlock()
                    265: {
                    266:        int s;
                    267:
1.132     thorpej   268:        s = splvm();
1.75      thorpej   269:        ipq_locked = 0;
                    270:        splx(s);
                    271: }
                    272:
                    273: #ifdef DIAGNOSTIC
                    274: #define        IPQ_LOCK()                                                      \
                    275: do {                                                                   \
                    276:        if (ipq_lock_try() == 0) {                                      \
                    277:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    278:                panic("ipq_lock");                                      \
                    279:        }                                                               \
1.159     perry     280: } while (/*CONSTCOND*/ 0)
1.75      thorpej   281: #define        IPQ_LOCK_CHECK()                                                \
                    282: do {                                                                   \
                    283:        if (ipq_locked == 0) {                                          \
                    284:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    285:                panic("ipq lock check");                                \
                    286:        }                                                               \
1.159     perry     287: } while (/*CONSTCOND*/ 0)
1.75      thorpej   288: #else
                    289: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    290: #define        IPQ_LOCK_CHECK()        /* nothing */
                    291: #endif
                    292:
                    293: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       294:
1.166     matt      295: struct pool inmulti_pool;
1.72      thorpej   296: struct pool ipqent_pool;
                    297:
1.135     thorpej   298: #ifdef INET_CSUM_COUNTERS
                    299: #include <sys/device.h>
                    300:
                    301: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    302:     NULL, "inet", "hwcsum bad");
                    303: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    304:     NULL, "inet", "hwcsum ok");
                    305: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    306:     NULL, "inet", "swcsum");
                    307:
                    308: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    309:
                    310: #else
                    311:
                    312: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    313:
                    314: #endif /* INET_CSUM_COUNTERS */
                    315:
1.1       cgd       316: /*
                    317:  * We need to save the IP options in case a protocol wants to respond
                    318:  * to an incoming packet over the same route if the packet got here
                    319:  * using IP source routing.  This allows connection establishment and
                    320:  * maintenance when the remote end is on a network that is not known
                    321:  * to us.
                    322:  */
                    323: int    ip_nhops = 0;
                    324: static struct ip_srcrt {
                    325:        struct  in_addr dst;                    /* final destination */
                    326:        char    nop;                            /* one NOP to align */
                    327:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    328:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    329: } ip_srcrt;
                    330:
1.13      mycroft   331: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   332:
1.164     matt      333: #ifdef MBUFTRACE
                    334: struct mowner ip_rx_mowner = { "internet", "rx" };
                    335: struct mowner ip_tx_mowner = { "internet", "tx" };
                    336: #endif
                    337:
1.1       cgd       338: /*
                    339:  * IP initialization: fill in IP protocol switch table.
                    340:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    341:  */
1.8       mycroft   342: void
1.1       cgd       343: ip_init()
                    344: {
1.109     augustss  345:        struct protosw *pr;
                    346:        int i;
1.1       cgd       347:
1.166     matt      348:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    349:            NULL);
1.72      thorpej   350:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   351:            NULL);
1.72      thorpej   352:
1.1       cgd       353:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    354:        if (pr == 0)
                    355:                panic("ip_init");
                    356:        for (i = 0; i < IPPROTO_MAX; i++)
                    357:                ip_protox[i] = pr - inetsw;
                    358:        for (pr = inetdomain.dom_protosw;
                    359:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    360:                if (pr->pr_domain->dom_family == PF_INET &&
                    361:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    362:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.25      cgd       363:        LIST_INIT(&ipq);
1.1       cgd       364:        ip_id = time.tv_sec & 0xffff;
                    365:        ipintrq.ifq_maxlen = ipqmaxlen;
1.22      mycroft   366:        TAILQ_INIT(&in_ifaddr);
1.120     ad        367:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    368:            M_WAITOK, &in_ifaddrhash);
1.166     matt      369:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    370:            M_WAITOK, &in_multihash);
1.160     itojun    371:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   372: #ifdef GATEWAY
                    373:        ipflow_init();
                    374: #endif
1.121     thorpej   375:
                    376: #ifdef PFIL_HOOKS
                    377:        /* Register our Packet Filter hook. */
1.126     thorpej   378:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    379:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   380:        i = pfil_head_register(&inet_pfil_hook);
                    381:        if (i != 0)
                    382:                printf("ip_init: WARNING: unable to register pfil hook, "
                    383:                    "error %d\n", i);
                    384: #endif /* PFIL_HOOKS */
1.135     thorpej   385:
                    386: #ifdef INET_CSUM_COUNTERS
                    387:        evcnt_attach_static(&ip_hwcsum_bad);
                    388:        evcnt_attach_static(&ip_hwcsum_ok);
                    389:        evcnt_attach_static(&ip_swcsum);
                    390: #endif /* INET_CSUM_COUNTERS */
1.164     matt      391:
                    392: #ifdef MBUFTRACE
                    393:        MOWNER_ATTACH(&ip_tx_mowner);
                    394:        MOWNER_ATTACH(&ip_rx_mowner);
                    395: #endif /* MBUFTRACE */
1.1       cgd       396: }
                    397:
                    398: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    399: struct route ipforward_rt;
                    400:
                    401: /*
1.89      itojun    402:  * IP software interrupt routine
                    403:  */
                    404: void
                    405: ipintr()
                    406: {
                    407:        int s;
                    408:        struct mbuf *m;
                    409:
                    410:        while (1) {
1.132     thorpej   411:                s = splnet();
1.89      itojun    412:                IF_DEQUEUE(&ipintrq, m);
                    413:                splx(s);
                    414:                if (m == 0)
                    415:                        return;
1.164     matt      416:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    417:                ip_input(m);
                    418:        }
                    419: }
                    420:
                    421: /*
1.1       cgd       422:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    423:  * try to reassemble.  Process options.  Pass to next level.
                    424:  */
1.8       mycroft   425: void
1.89      itojun    426: ip_input(struct mbuf *m)
1.1       cgd       427: {
1.109     augustss  428:        struct ip *ip = NULL;
                    429:        struct ipq *fp;
                    430:        struct in_ifaddr *ia;
                    431:        struct ifaddr *ifa;
1.25      cgd       432:        struct ipqent *ipqe;
1.89      itojun    433:        int hlen = 0, mff, len;
1.100     itojun    434:        int downmatch;
1.165     christos  435:        int checkif;
1.169   ! itojun    436:        int srcrt = 0;
1.1       cgd       437:
1.164     matt      438:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       439: #ifdef DIAGNOSTIC
                    440:        if ((m->m_flags & M_PKTHDR) == 0)
                    441:                panic("ipintr no HDR");
                    442: #endif
1.89      itojun    443: #ifdef IPSEC
                    444:        /*
                    445:         * should the inner packet be considered authentic?
                    446:         * see comment in ah4_input().
                    447:         */
                    448:        if (m) {
                    449:                m->m_flags &= ~M_AUTHIPHDR;
                    450:                m->m_flags &= ~M_AUTHIPDGM;
                    451:        }
                    452: #endif
1.164     matt      453:
1.1       cgd       454:        /*
                    455:         * If no IP addresses have been set yet but the interfaces
                    456:         * are receiving, can't do anything with incoming packets yet.
                    457:         */
1.140     matt      458:        if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1       cgd       459:                goto bad;
                    460:        ipstat.ips_total++;
1.154     thorpej   461:        /*
                    462:         * If the IP header is not aligned, slurp it up into a new
                    463:         * mbuf with space for link headers, in the event we forward
                    464:         * it.  Otherwise, if it is aligned, make sure the entire
                    465:         * base IP header is in the first mbuf of the chain.
                    466:         */
                    467:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    468:                if ((m = m_copyup(m, sizeof(struct ip),
                    469:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    470:                        /* XXXJRT new stat, please */
                    471:                        ipstat.ips_toosmall++;
                    472:                        return;
                    473:                }
                    474:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    475:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    476:                        ipstat.ips_toosmall++;
                    477:                        return;
                    478:                }
1.1       cgd       479:        }
                    480:        ip = mtod(m, struct ip *);
1.13      mycroft   481:        if (ip->ip_v != IPVERSION) {
                    482:                ipstat.ips_badvers++;
                    483:                goto bad;
                    484:        }
1.1       cgd       485:        hlen = ip->ip_hl << 2;
                    486:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    487:                ipstat.ips_badhlen++;
                    488:                goto bad;
                    489:        }
                    490:        if (hlen > m->m_len) {
                    491:                if ((m = m_pullup(m, hlen)) == 0) {
                    492:                        ipstat.ips_badhlen++;
1.89      itojun    493:                        return;
1.1       cgd       494:                }
                    495:                ip = mtod(m, struct ip *);
                    496:        }
1.98      thorpej   497:
1.85      hwr       498:        /*
1.99      thorpej   499:         * RFC1122: packets with a multicast source address are
1.98      thorpej   500:         * not allowed.
1.85      hwr       501:         */
                    502:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    503:                ipstat.ips_badaddr++;
1.85      hwr       504:                goto bad;
1.129     itojun    505:        }
                    506:
                    507:        /* 127/8 must not appear on wire - RFC1122 */
                    508:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    509:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    510:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    511:                        ipstat.ips_badaddr++;
1.129     itojun    512:                        goto bad;
1.130     itojun    513:                }
1.85      hwr       514:        }
                    515:
1.135     thorpej   516:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   517:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   518:                 M_CSUM_IPv4_BAD)) {
                    519:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    520:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    521:                goto badcsum;
                    522:
                    523:        case M_CSUM_IPv4:
                    524:                /* Checksum was okay. */
                    525:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    526:                break;
                    527:
                    528:        default:
                    529:                /* Must compute it ourselves. */
                    530:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    531:                if (in_cksum(m, hlen) != 0)
                    532:                        goto bad;
                    533:                break;
1.1       cgd       534:        }
                    535:
1.121     thorpej   536:        /* Retrieve the packet length. */
                    537:        len = ntohs(ip->ip_len);
1.81      proff     538:
                    539:        /*
                    540:         * Check for additional length bogosity
                    541:         */
1.84      proff     542:        if (len < hlen) {
1.81      proff     543:                ipstat.ips_badlen++;
                    544:                goto bad;
                    545:        }
1.1       cgd       546:
                    547:        /*
                    548:         * Check that the amount of data in the buffers
                    549:         * is as at least much as the IP header would have us expect.
                    550:         * Trim mbufs if longer than we expect.
                    551:         * Drop packet if shorter than we expect.
                    552:         */
1.35      mycroft   553:        if (m->m_pkthdr.len < len) {
1.1       cgd       554:                ipstat.ips_tooshort++;
                    555:                goto bad;
                    556:        }
1.35      mycroft   557:        if (m->m_pkthdr.len > len) {
1.1       cgd       558:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   559:                        m->m_len = len;
                    560:                        m->m_pkthdr.len = len;
1.1       cgd       561:                } else
1.35      mycroft   562:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       563:        }
                    564:
1.94      itojun    565: #ifdef IPSEC
1.149     wiz       566:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    567:        m->m_flags &= ~M_CANFASTFWD;
                    568: #else
1.64      thorpej   569:        /*
                    570:         * Assume that we can create a fast-forward IP flow entry
                    571:         * based on this packet.
                    572:         */
                    573:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    574: #endif
1.64      thorpej   575:
1.36      mrg       576: #ifdef PFIL_HOOKS
1.33      mrg       577:        /*
1.64      thorpej   578:         * Run through list of hooks for input packets.  If there are any
                    579:         * filters which require that additional packets in the flow are
                    580:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    581:         * Note that filters must _never_ set this flag, as another filter
                    582:         * in the list may have previously cleared it.
1.33      mrg       583:         */
1.127     itojun    584:        /*
                    585:         * let ipfilter look at packet on the wire,
                    586:         * not the decapsulated packet.
                    587:         */
                    588: #ifdef IPSEC
1.136     itojun    589:        if (!ipsec_getnhist(m))
1.127     itojun    590: #else
                    591:        if (1)
                    592: #endif
                    593:        {
1.169   ! itojun    594:                struct in_addr odst;
        !           595:
        !           596:                odst = ip->ip_dst;
1.127     itojun    597:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    598:                    PFIL_IN) != 0)
                    599:                        return;
1.127     itojun    600:                if (m == NULL)
                    601:                        return;
                    602:                ip = mtod(m, struct ip *);
1.142     darrenr   603:                hlen = ip->ip_hl << 2;
1.169   ! itojun    604:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    605:        }
1.36      mrg       606: #endif /* PFIL_HOOKS */
1.123     thorpej   607:
                    608: #ifdef ALTQ
                    609:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    610:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    611:                /* packet dropped by traffic conditioner */
                    612:                return;
                    613:        }
                    614: #endif
1.121     thorpej   615:
                    616:        /*
1.1       cgd       617:         * Process options and, if not destined for us,
                    618:         * ship it on.  ip_dooptions returns 1 when an
                    619:         * error was detected (causing an icmp message
                    620:         * to be sent and the original packet to be freed).
                    621:         */
                    622:        ip_nhops = 0;           /* for source routed packets */
                    623:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    624:                return;
1.1       cgd       625:
                    626:        /*
1.165     christos  627:         * Enable a consistency check between the destination address
                    628:         * and the arrival interface for a unicast packet (the RFC 1122
                    629:         * strong ES model) if IP forwarding is disabled and the packet
                    630:         * is not locally generated.
                    631:         *
                    632:         * XXX - Checking also should be disabled if the destination
                    633:         * address is ipnat'ed to a different interface.
                    634:         *
                    635:         * XXX - Checking is incompatible with IP aliases added
                    636:         * to the loopback interface instead of the interface where
                    637:         * the packets are received.
                    638:         *
                    639:         * XXX - We need to add a per ifaddr flag for this so that
                    640:         * we get finer grain control.
                    641:         */
                    642:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    643:            (m->m_pkthdr.rcvif != NULL) &&
                    644:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    645:
                    646:        /*
1.1       cgd       647:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    648:         *
                    649:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    650:         * The behavior here is to treat addresses on !IFF_UP interface
                    651:         * as not mine.
1.1       cgd       652:         */
1.100     itojun    653:        downmatch = 0;
1.140     matt      654:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    655:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  656:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    657:                                continue;
1.97      itojun    658:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    659:                                break;
1.100     itojun    660:                        else
                    661:                                downmatch++;
1.97      itojun    662:                }
                    663:        }
1.86      thorpej   664:        if (ia != NULL)
                    665:                goto ours;
1.57      tls       666:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      667:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    668:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    669:                                continue;
1.57      tls       670:                        ia = ifatoia(ifa);
1.35      mycroft   671:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    672:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   673:                            /*
                    674:                             * Look for all-0's host part (old broadcast addr),
                    675:                             * either for subnet or net.
                    676:                             */
                    677:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   678:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       679:                                goto ours;
1.57      tls       680:                        /*
                    681:                         * An interface with IP address zero accepts
                    682:                         * all packets that arrive on that interface.
                    683:                         */
                    684:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    685:                                goto ours;
1.1       cgd       686:                }
                    687:        }
1.18      mycroft   688:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   689:                struct in_multi *inm;
                    690: #ifdef MROUTING
                    691:                extern struct socket *ip_mrouter;
1.10      brezak    692:
1.147     matt      693:                if (M_READONLY(m)) {
1.10      brezak    694:                        if ((m = m_pullup(m, hlen)) == 0) {
                    695:                                ipstat.ips_toosmall++;
1.89      itojun    696:                                return;
1.10      brezak    697:                        }
                    698:                        ip = mtod(m, struct ip *);
                    699:                }
1.4       hpeyerl   700:
                    701:                if (ip_mrouter) {
                    702:                        /*
                    703:                         * If we are acting as a multicast router, all
                    704:                         * incoming multicast packets are passed to the
                    705:                         * kernel-level multicast forwarding function.
                    706:                         * The packet is returned (relatively) intact; if
                    707:                         * ip_mforward() returns a non-zero value, the packet
                    708:                         * must be discarded, else it may be accepted below.
                    709:                         *
                    710:                         * (The IP ident field is put in the same byte order
                    711:                         * as expected when ip_mforward() is called from
                    712:                         * ip_output().)
                    713:                         */
1.13      mycroft   714:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    715:                                ipstat.ips_cantforward++;
1.4       hpeyerl   716:                                m_freem(m);
1.89      itojun    717:                                return;
1.4       hpeyerl   718:                        }
                    719:
                    720:                        /*
                    721:                         * The process-level routing demon needs to receive
                    722:                         * all multicast IGMP packets, whether or not this
                    723:                         * host belongs to their destination groups.
                    724:                         */
                    725:                        if (ip->ip_p == IPPROTO_IGMP)
                    726:                                goto ours;
1.13      mycroft   727:                        ipstat.ips_forward++;
1.4       hpeyerl   728:                }
                    729: #endif
                    730:                /*
                    731:                 * See if we belong to the destination multicast group on the
                    732:                 * arrival interface.
                    733:                 */
                    734:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    735:                if (inm == NULL) {
1.13      mycroft   736:                        ipstat.ips_cantforward++;
1.4       hpeyerl   737:                        m_freem(m);
1.89      itojun    738:                        return;
1.4       hpeyerl   739:                }
                    740:                goto ours;
                    741:        }
1.19      mycroft   742:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   743:            in_nullhost(ip->ip_dst))
1.1       cgd       744:                goto ours;
                    745:
                    746:        /*
                    747:         * Not for us; forward if possible and desirable.
                    748:         */
                    749:        if (ipforwarding == 0) {
                    750:                ipstat.ips_cantforward++;
                    751:                m_freem(m);
1.100     itojun    752:        } else {
                    753:                /*
                    754:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    755:                 * and there's no IFF_UP interface that matches ip_dst,
                    756:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    757:                 * forwarding loop till TTL goes to 0.
                    758:                 */
                    759:                if (downmatch) {
                    760:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    761:                        ipstat.ips_cantforward++;
                    762:                        return;
                    763:                }
1.145     itojun    764: #ifdef IPSEC
                    765:                if (ipsec4_in_reject(m, NULL)) {
                    766:                        ipsecstat.in_polvio++;
                    767:                        goto bad;
                    768:                }
                    769: #endif
                    770:
1.169   ! itojun    771:                ip_forward(m, srcrt);
1.100     itojun    772:        }
1.89      itojun    773:        return;
1.1       cgd       774:
                    775: ours:
                    776:        /*
                    777:         * If offset or IP_MF are set, must reassemble.
                    778:         * Otherwise, nothing need be done.
                    779:         * (We could look in the reassembly queue to see
                    780:         * if the packet was previously fragmented,
                    781:         * but it's not worth the time; just let them time out.)
                    782:         */
1.155     itojun    783:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    784:                if (M_READONLY(m)) {
                    785:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    786:                                ipstat.ips_toosmall++;
                    787:                                goto bad;
                    788:                        }
                    789:                        ip = mtod(m, struct ip *);
                    790:                }
                    791:
1.1       cgd       792:                /*
                    793:                 * Look for queue of fragments
                    794:                 * of this datagram.
                    795:                 */
1.75      thorpej   796:                IPQ_LOCK();
1.140     matt      797:                LIST_FOREACH(fp, &ipq, ipq_q)
1.1       cgd       798:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   799:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    800:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       801:                            ip->ip_p == fp->ipq_p)
                    802:                                goto found;
                    803:                fp = 0;
                    804: found:
                    805:
                    806:                /*
                    807:                 * Adjust ip_len to not reflect header,
1.25      cgd       808:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       809:                 * convert offset of this to bytes.
                    810:                 */
1.155     itojun    811:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    812:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       813:                if (mff) {
1.16      cgd       814:                        /*
                    815:                         * Make sure that fragments have a data length
                    816:                         * that's a non-zero multiple of 8 bytes.
                    817:                         */
1.155     itojun    818:                        if (ntohs(ip->ip_len) == 0 ||
                    819:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       820:                                ipstat.ips_badfrags++;
1.75      thorpej   821:                                IPQ_UNLOCK();
1.16      cgd       822:                                goto bad;
                    823:                        }
                    824:                }
1.155     itojun    825:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       826:
                    827:                /*
                    828:                 * If datagram marked as having more fragments
                    829:                 * or if this is not the first fragment,
                    830:                 * attempt reassembly; if it succeeds, proceed.
                    831:                 */
1.155     itojun    832:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       833:                        ipstat.ips_fragments++;
1.72      thorpej   834:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       835:                        if (ipqe == NULL) {
                    836:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   837:                                IPQ_UNLOCK();
1.25      cgd       838:                                goto bad;
                    839:                        }
                    840:                        ipqe->ipqe_mff = mff;
1.50      thorpej   841:                        ipqe->ipqe_m = m;
1.25      cgd       842:                        ipqe->ipqe_ip = ip;
1.50      thorpej   843:                        m = ip_reass(ipqe, fp);
1.75      thorpej   844:                        if (m == 0) {
                    845:                                IPQ_UNLOCK();
1.89      itojun    846:                                return;
1.75      thorpej   847:                        }
1.13      mycroft   848:                        ipstat.ips_reassembled++;
1.50      thorpej   849:                        ip = mtod(m, struct ip *);
1.74      thorpej   850:                        hlen = ip->ip_hl << 2;
1.155     itojun    851:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       852:                } else
                    853:                        if (fp)
                    854:                                ip_freef(fp);
1.75      thorpej   855:                IPQ_UNLOCK();
1.79      mycroft   856:        }
1.128     itojun    857:
                    858: #ifdef IPSEC
                    859:        /*
                    860:         * enforce IPsec policy checking if we are seeing last header.
                    861:         * note that we do not visit this with protocols with pcb layer
                    862:         * code - like udp/tcp/raw ip.
                    863:         */
                    864:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    865:            ipsec4_in_reject(m, NULL)) {
                    866:                ipsecstat.in_polvio++;
                    867:                goto bad;
                    868:        }
                    869: #endif
1.1       cgd       870:
                    871:        /*
                    872:         * Switch out to protocol's input routine.
                    873:         */
1.82      aidan     874: #if IFA_STATS
1.122     itojun    875:        if (ia && ip)
1.155     itojun    876:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     877: #endif
1.1       cgd       878:        ipstat.ips_delivered++;
1.89      itojun    879:     {
                    880:        int off = hlen, nh = ip->ip_p;
                    881:
                    882:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    883:        return;
                    884:     }
1.1       cgd       885: bad:
                    886:        m_freem(m);
1.135     thorpej   887:        return;
                    888:
                    889: badcsum:
                    890:        ipstat.ips_badsum++;
                    891:        m_freem(m);
1.1       cgd       892: }
                    893:
                    894: /*
                    895:  * Take incoming datagram fragment and try to
                    896:  * reassemble it into whole datagram.  If a chain for
                    897:  * reassembly of this datagram already exists, then it
                    898:  * is given as fp; otherwise have to make a chain.
                    899:  */
1.50      thorpej   900: struct mbuf *
1.25      cgd       901: ip_reass(ipqe, fp)
1.109     augustss  902:        struct ipqent *ipqe;
                    903:        struct ipq *fp;
1.1       cgd       904: {
1.109     augustss  905:        struct mbuf *m = ipqe->ipqe_m;
                    906:        struct ipqent *nq, *p, *q;
1.25      cgd       907:        struct ip *ip;
1.1       cgd       908:        struct mbuf *t;
1.25      cgd       909:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       910:        int i, next;
                    911:
1.75      thorpej   912:        IPQ_LOCK_CHECK();
                    913:
1.1       cgd       914:        /*
                    915:         * Presence of header sizes in mbufs
                    916:         * would confuse code below.
                    917:         */
                    918:        m->m_data += hlen;
                    919:        m->m_len -= hlen;
                    920:
                    921:        /*
                    922:         * If first fragment to arrive, create a reassembly queue.
                    923:         */
                    924:        if (fp == 0) {
1.131     itojun    925:                /*
                    926:                 * Enforce upper bound on number of fragmented packets
                    927:                 * for which we attempt reassembly;
                    928:                 * If maxfrag is 0, never accept fragments.
                    929:                 * If maxfrag is -1, accept all fragments without limitation.
                    930:                 */
                    931:                if (ip_maxfragpackets < 0)
                    932:                        ;
                    933:                else if (ip_nfragpackets >= ip_maxfragpackets)
                    934:                        goto dropfrag;
                    935:                ip_nfragpackets++;
1.50      thorpej   936:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                    937:                    M_FTABLE, M_NOWAIT);
                    938:                if (fp == NULL)
1.1       cgd       939:                        goto dropfrag;
1.25      cgd       940:                LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1       cgd       941:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd       942:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                    943:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt      944:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd       945:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                    946:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                    947:                p = NULL;
1.1       cgd       948:                goto insert;
                    949:        }
                    950:
                    951:        /*
                    952:         * Find a segment which begins after this one does.
                    953:         */
1.148     matt      954:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                    955:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun    956:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd       957:                        break;
                    958:
                    959:        /*
                    960:         * If there is a preceding segment, it may provide some of
                    961:         * our data already.  If so, drop the data from the incoming
                    962:         * segment.  If it provides all of our data, drop us.
                    963:         */
1.25      cgd       964:        if (p != NULL) {
1.155     itojun    965:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                    966:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd       967:                if (i > 0) {
1.155     itojun    968:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd       969:                                goto dropfrag;
1.50      thorpej   970:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun    971:                        ipqe->ipqe_ip->ip_off =
                    972:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                    973:                        ipqe->ipqe_ip->ip_len =
                    974:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd       975:                }
                    976:        }
                    977:
                    978:        /*
                    979:         * While we overlap succeeding segments trim them or,
                    980:         * if they are completely covered, dequeue them.
                    981:         */
1.155     itojun    982:        for (; q != NULL &&
                    983:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                    984:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                    985:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                    986:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                    987:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                    988:                        q->ipqe_ip->ip_len =
                    989:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                    990:                        q->ipqe_ip->ip_off =
                    991:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej   992:                        m_adj(q->ipqe_m, i);
1.1       cgd       993:                        break;
                    994:                }
1.148     matt      995:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej   996:                m_freem(q->ipqe_m);
1.148     matt      997:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej   998:                pool_put(&ipqent_pool, q);
1.1       cgd       999:        }
                   1000:
                   1001: insert:
                   1002:        /*
                   1003:         * Stick new segment in its place;
                   1004:         * check for complete reassembly.
                   1005:         */
1.25      cgd      1006:        if (p == NULL) {
1.148     matt     1007:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1008:        } else {
1.148     matt     1009:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1010:        }
1.1       cgd      1011:        next = 0;
1.148     matt     1012:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1013:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1014:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1015:                        return (0);
1.155     itojun   1016:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1017:        }
1.25      cgd      1018:        if (p->ipqe_mff)
1.1       cgd      1019:                return (0);
                   1020:
                   1021:        /*
1.41      thorpej  1022:         * Reassembly is complete.  Check for a bogus message size and
                   1023:         * concatenate fragments.
1.1       cgd      1024:         */
1.148     matt     1025:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1026:        ip = q->ipqe_ip;
1.41      thorpej  1027:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1028:                ipstat.ips_toolong++;
                   1029:                ip_freef(fp);
                   1030:                return (0);
                   1031:        }
1.50      thorpej  1032:        m = q->ipqe_m;
1.1       cgd      1033:        t = m->m_next;
                   1034:        m->m_next = 0;
                   1035:        m_cat(m, t);
1.148     matt     1036:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1037:        pool_put(&ipqent_pool, q);
1.25      cgd      1038:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1039:                t = q->ipqe_m;
1.148     matt     1040:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1041:                pool_put(&ipqent_pool, q);
1.1       cgd      1042:                m_cat(m, t);
                   1043:        }
                   1044:
                   1045:        /*
                   1046:         * Create header for new ip packet by
                   1047:         * modifying header of first packet;
                   1048:         * dequeue and discard fragment reassembly header.
                   1049:         * Make header visible.
                   1050:         */
1.155     itojun   1051:        ip->ip_len = htons(next);
1.25      cgd      1052:        ip->ip_src = fp->ipq_src;
                   1053:        ip->ip_dst = fp->ipq_dst;
                   1054:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1055:        FREE(fp, M_FTABLE);
1.131     itojun   1056:        ip_nfragpackets--;
1.1       cgd      1057:        m->m_len += (ip->ip_hl << 2);
                   1058:        m->m_data -= (ip->ip_hl << 2);
                   1059:        /* some debugging cruft by sklower, below, will go away soon */
                   1060:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1061:                int plen = 0;
1.50      thorpej  1062:                for (t = m; t; t = t->m_next)
                   1063:                        plen += t->m_len;
                   1064:                m->m_pkthdr.len = plen;
1.1       cgd      1065:        }
1.50      thorpej  1066:        return (m);
1.1       cgd      1067:
                   1068: dropfrag:
                   1069:        ipstat.ips_fragdropped++;
                   1070:        m_freem(m);
1.72      thorpej  1071:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1072:        return (0);
                   1073: }
                   1074:
                   1075: /*
                   1076:  * Free a fragment reassembly header and all
                   1077:  * associated datagrams.
                   1078:  */
1.8       mycroft  1079: void
1.1       cgd      1080: ip_freef(fp)
                   1081:        struct ipq *fp;
                   1082: {
1.109     augustss 1083:        struct ipqent *q, *p;
1.1       cgd      1084:
1.75      thorpej  1085:        IPQ_LOCK_CHECK();
                   1086:
1.148     matt     1087:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1088:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1089:                m_freem(q->ipqe_m);
1.148     matt     1090:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1091:                pool_put(&ipqent_pool, q);
1.1       cgd      1092:        }
1.25      cgd      1093:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1094:        FREE(fp, M_FTABLE);
1.131     itojun   1095:        ip_nfragpackets--;
1.1       cgd      1096: }
                   1097:
                   1098: /*
                   1099:  * IP timer processing;
                   1100:  * if a timer expires on a reassembly
                   1101:  * queue, discard it.
                   1102:  */
1.8       mycroft  1103: void
1.1       cgd      1104: ip_slowtimo()
                   1105: {
1.109     augustss 1106:        struct ipq *fp, *nfp;
1.24      mycroft  1107:        int s = splsoftnet();
1.1       cgd      1108:
1.75      thorpej  1109:        IPQ_LOCK();
1.140     matt     1110:        for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
                   1111:                nfp = LIST_NEXT(fp, ipq_q);
1.25      cgd      1112:                if (--fp->ipq_ttl == 0) {
1.1       cgd      1113:                        ipstat.ips_fragtimeout++;
1.25      cgd      1114:                        ip_freef(fp);
1.1       cgd      1115:                }
                   1116:        }
1.131     itojun   1117:        /*
                   1118:         * If we are over the maximum number of fragments
                   1119:         * (due to the limit being lowered), drain off
                   1120:         * enough to get down to the new limit.
                   1121:         */
                   1122:        if (ip_maxfragpackets < 0)
                   1123:                ;
                   1124:        else {
1.140     matt     1125:                while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
                   1126:                        ip_freef(LIST_FIRST(&ipq));
1.131     itojun   1127:        }
1.75      thorpej  1128:        IPQ_UNLOCK();
1.63      matt     1129: #ifdef GATEWAY
                   1130:        ipflow_slowtimo();
                   1131: #endif
1.1       cgd      1132:        splx(s);
                   1133: }
                   1134:
                   1135: /*
                   1136:  * Drain off all datagram fragments.
                   1137:  */
1.8       mycroft  1138: void
1.1       cgd      1139: ip_drain()
                   1140: {
                   1141:
1.75      thorpej  1142:        /*
                   1143:         * We may be called from a device's interrupt context.  If
                   1144:         * the ipq is already busy, just bail out now.
                   1145:         */
                   1146:        if (ipq_lock_try() == 0)
                   1147:                return;
                   1148:
1.140     matt     1149:        while (LIST_FIRST(&ipq) != NULL) {
1.1       cgd      1150:                ipstat.ips_fragdropped++;
1.140     matt     1151:                ip_freef(LIST_FIRST(&ipq));
1.1       cgd      1152:        }
1.75      thorpej  1153:
                   1154:        IPQ_UNLOCK();
1.1       cgd      1155: }
                   1156:
                   1157: /*
                   1158:  * Do option processing on a datagram,
                   1159:  * possibly discarding it if bad options are encountered,
                   1160:  * or forwarding it if source-routed.
                   1161:  * Returns 1 if packet has been forwarded/freed,
                   1162:  * 0 if the packet should be processed further.
                   1163:  */
1.8       mycroft  1164: int
1.1       cgd      1165: ip_dooptions(m)
                   1166:        struct mbuf *m;
                   1167: {
1.109     augustss 1168:        struct ip *ip = mtod(m, struct ip *);
                   1169:        u_char *cp, *cp0;
                   1170:        struct ip_timestamp *ipt;
                   1171:        struct in_ifaddr *ia;
1.1       cgd      1172:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1173:        struct in_addr dst;
1.1       cgd      1174:        n_time ntime;
                   1175:
1.13      mycroft  1176:        dst = ip->ip_dst;
1.1       cgd      1177:        cp = (u_char *)(ip + 1);
                   1178:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1179:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1180:                opt = cp[IPOPT_OPTVAL];
                   1181:                if (opt == IPOPT_EOL)
                   1182:                        break;
                   1183:                if (opt == IPOPT_NOP)
                   1184:                        optlen = 1;
                   1185:                else {
1.113     itojun   1186:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1187:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1188:                                goto bad;
                   1189:                        }
1.1       cgd      1190:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1191:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1192:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1193:                                goto bad;
                   1194:                        }
                   1195:                }
                   1196:                switch (opt) {
                   1197:
                   1198:                default:
                   1199:                        break;
                   1200:
                   1201:                /*
                   1202:                 * Source routing with record.
                   1203:                 * Find interface with current destination address.
                   1204:                 * If none on this machine then drop if strictly routed,
                   1205:                 * or do nothing if loosely routed.
                   1206:                 * Record interface address and bring up next address
                   1207:                 * component.  If strictly routed make sure next
                   1208:                 * address is on directly accessible net.
                   1209:                 */
                   1210:                case IPOPT_LSRR:
                   1211:                case IPOPT_SSRR:
1.47      cjs      1212:                        if (ip_allowsrcrt == 0) {
                   1213:                                type = ICMP_UNREACH;
                   1214:                                code = ICMP_UNREACH_NET_PROHIB;
                   1215:                                goto bad;
                   1216:                        }
1.114     itojun   1217:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1218:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1219:                                goto bad;
                   1220:                        }
1.1       cgd      1221:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1222:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1223:                                goto bad;
                   1224:                        }
                   1225:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1226:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1227:                        if (ia == 0) {
                   1228:                                if (opt == IPOPT_SSRR) {
                   1229:                                        type = ICMP_UNREACH;
                   1230:                                        code = ICMP_UNREACH_SRCFAIL;
                   1231:                                        goto bad;
                   1232:                                }
                   1233:                                /*
                   1234:                                 * Loose routing, and not at next destination
                   1235:                                 * yet; nothing to do except forward.
                   1236:                                 */
                   1237:                                break;
                   1238:                        }
                   1239:                        off--;                  /* 0 origin */
1.112     sommerfe 1240:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1241:                                /*
                   1242:                                 * End of source route.  Should be for us.
                   1243:                                 */
                   1244:                                save_rte(cp, ip->ip_src);
                   1245:                                break;
                   1246:                        }
                   1247:                        /*
                   1248:                         * locate outgoing interface
                   1249:                         */
                   1250:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1251:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1252:                        if (opt == IPOPT_SSRR)
                   1253:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1254:                        else
1.1       cgd      1255:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1256:                        if (ia == 0) {
                   1257:                                type = ICMP_UNREACH;
                   1258:                                code = ICMP_UNREACH_SRCFAIL;
                   1259:                                goto bad;
                   1260:                        }
                   1261:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1262:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1263:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1264:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1265:                        /*
                   1266:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1267:                         */
1.18      mycroft  1268:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1269:                        break;
                   1270:
                   1271:                case IPOPT_RR:
1.114     itojun   1272:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1273:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1274:                                goto bad;
                   1275:                        }
1.1       cgd      1276:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1277:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1278:                                goto bad;
                   1279:                        }
                   1280:                        /*
                   1281:                         * If no space remains, ignore.
                   1282:                         */
                   1283:                        off--;                  /* 0 origin */
1.112     sommerfe 1284:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1285:                                break;
                   1286:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1287:                            sizeof(ipaddr.sin_addr));
                   1288:                        /*
                   1289:                         * locate outgoing interface; if we're the destination,
                   1290:                         * use the incoming interface (should be same).
                   1291:                         */
1.96      thorpej  1292:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1293:                            == NULL &&
                   1294:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1295:                                type = ICMP_UNREACH;
                   1296:                                code = ICMP_UNREACH_HOST;
                   1297:                                goto bad;
                   1298:                        }
1.20      mycroft  1299:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1300:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1301:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1302:                        break;
                   1303:
                   1304:                case IPOPT_TS:
                   1305:                        code = cp - (u_char *)ip;
                   1306:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1307:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1308:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1309:                                goto bad;
1.114     itojun   1310:                        }
                   1311:                        if (ipt->ipt_ptr < 5) {
                   1312:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1313:                                goto bad;
                   1314:                        }
1.15      cgd      1315:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1316:                                if (++ipt->ipt_oflw == 0) {
                   1317:                                        code = (u_char *)&ipt->ipt_ptr -
                   1318:                                            (u_char *)ip;
1.1       cgd      1319:                                        goto bad;
1.114     itojun   1320:                                }
1.1       cgd      1321:                                break;
                   1322:                        }
1.104     thorpej  1323:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1324:                        switch (ipt->ipt_flg) {
                   1325:
                   1326:                        case IPOPT_TS_TSONLY:
                   1327:                                break;
                   1328:
                   1329:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1330:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1331:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1332:                                        code = (u_char *)&ipt->ipt_ptr -
                   1333:                                            (u_char *)ip;
1.1       cgd      1334:                                        goto bad;
1.114     itojun   1335:                                }
1.13      mycroft  1336:                                ipaddr.sin_addr = dst;
1.96      thorpej  1337:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1338:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1339:                                if (ia == 0)
                   1340:                                        continue;
1.104     thorpej  1341:                                bcopy(&ia->ia_addr.sin_addr,
                   1342:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1343:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1344:                                break;
                   1345:
                   1346:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1347:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1348:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1349:                                        code = (u_char *)&ipt->ipt_ptr -
                   1350:                                            (u_char *)ip;
1.1       cgd      1351:                                        goto bad;
1.114     itojun   1352:                                }
1.104     thorpej  1353:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1354:                                    sizeof(struct in_addr));
1.96      thorpej  1355:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1356:                                    == NULL)
1.1       cgd      1357:                                        continue;
                   1358:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1359:                                break;
                   1360:
                   1361:                        default:
1.114     itojun   1362:                                /* XXX can't take &ipt->ipt_flg */
                   1363:                                code = (u_char *)&ipt->ipt_ptr -
                   1364:                                    (u_char *)ip + 1;
1.1       cgd      1365:                                goto bad;
                   1366:                        }
                   1367:                        ntime = iptime();
1.107     thorpej  1368:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1369:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1370:                            sizeof(n_time));
                   1371:                        ipt->ipt_ptr += sizeof(n_time);
                   1372:                }
                   1373:        }
                   1374:        if (forward) {
1.26      thorpej  1375:                if (ip_forwsrcrt == 0) {
                   1376:                        type = ICMP_UNREACH;
                   1377:                        code = ICMP_UNREACH_SRCFAIL;
                   1378:                        goto bad;
                   1379:                }
1.1       cgd      1380:                ip_forward(m, 1);
                   1381:                return (1);
1.13      mycroft  1382:        }
                   1383:        return (0);
1.1       cgd      1384: bad:
1.13      mycroft  1385:        icmp_error(m, type, code, 0, 0);
                   1386:        ipstat.ips_badoptions++;
1.1       cgd      1387:        return (1);
                   1388: }
                   1389:
                   1390: /*
                   1391:  * Given address of next destination (final or next hop),
                   1392:  * return internet address info of interface to be used to get there.
                   1393:  */
                   1394: struct in_ifaddr *
                   1395: ip_rtaddr(dst)
                   1396:         struct in_addr dst;
                   1397: {
1.109     augustss 1398:        struct sockaddr_in *sin;
1.1       cgd      1399:
1.19      mycroft  1400:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1401:
1.35      mycroft  1402:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1403:                if (ipforward_rt.ro_rt) {
                   1404:                        RTFREE(ipforward_rt.ro_rt);
                   1405:                        ipforward_rt.ro_rt = 0;
                   1406:                }
                   1407:                sin->sin_family = AF_INET;
                   1408:                sin->sin_len = sizeof(*sin);
                   1409:                sin->sin_addr = dst;
                   1410:
                   1411:                rtalloc(&ipforward_rt);
                   1412:        }
                   1413:        if (ipforward_rt.ro_rt == 0)
                   1414:                return ((struct in_ifaddr *)0);
1.19      mycroft  1415:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1416: }
                   1417:
                   1418: /*
                   1419:  * Save incoming source route for use in replies,
                   1420:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1421:  */
1.13      mycroft  1422: void
1.1       cgd      1423: save_rte(option, dst)
                   1424:        u_char *option;
                   1425:        struct in_addr dst;
                   1426: {
                   1427:        unsigned olen;
                   1428:
                   1429:        olen = option[IPOPT_OLEN];
                   1430: #ifdef DIAGNOSTIC
                   1431:        if (ipprintfs)
1.39      christos 1432:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1433: #endif /* 0 */
1.1       cgd      1434:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1435:                return;
                   1436:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1437:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1438:        ip_srcrt.dst = dst;
                   1439: }
                   1440:
                   1441: /*
                   1442:  * Retrieve incoming source route for use in replies,
                   1443:  * in the same form used by setsockopt.
                   1444:  * The first hop is placed before the options, will be removed later.
                   1445:  */
                   1446: struct mbuf *
                   1447: ip_srcroute()
                   1448: {
1.109     augustss 1449:        struct in_addr *p, *q;
                   1450:        struct mbuf *m;
1.1       cgd      1451:
                   1452:        if (ip_nhops == 0)
                   1453:                return ((struct mbuf *)0);
                   1454:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1455:        if (m == 0)
                   1456:                return ((struct mbuf *)0);
                   1457:
1.164     matt     1458:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1459: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1460:
                   1461:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1462:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1463:            OPTSIZ;
                   1464: #ifdef DIAGNOSTIC
                   1465:        if (ipprintfs)
1.39      christos 1466:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1467: #endif
                   1468:
                   1469:        /*
                   1470:         * First save first hop for return route
                   1471:         */
                   1472:        p = &ip_srcrt.route[ip_nhops - 1];
                   1473:        *(mtod(m, struct in_addr *)) = *p--;
                   1474: #ifdef DIAGNOSTIC
                   1475:        if (ipprintfs)
1.39      christos 1476:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1477: #endif
                   1478:
                   1479:        /*
                   1480:         * Copy option fields and padding (nop) to mbuf.
                   1481:         */
                   1482:        ip_srcrt.nop = IPOPT_NOP;
                   1483:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1484:        bcopy((caddr_t)&ip_srcrt.nop,
                   1485:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1486:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1487:            sizeof(struct in_addr) + OPTSIZ);
                   1488: #undef OPTSIZ
                   1489:        /*
                   1490:         * Record return path as an IP source route,
                   1491:         * reversing the path (pointers are now aligned).
                   1492:         */
                   1493:        while (p >= ip_srcrt.route) {
                   1494: #ifdef DIAGNOSTIC
                   1495:                if (ipprintfs)
1.39      christos 1496:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1497: #endif
                   1498:                *q++ = *p--;
                   1499:        }
                   1500:        /*
                   1501:         * Last hop goes to final destination.
                   1502:         */
                   1503:        *q = ip_srcrt.dst;
                   1504: #ifdef DIAGNOSTIC
                   1505:        if (ipprintfs)
1.39      christos 1506:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1507: #endif
                   1508:        return (m);
                   1509: }
                   1510:
                   1511: /*
                   1512:  * Strip out IP options, at higher
                   1513:  * level protocol in the kernel.
                   1514:  * Second argument is buffer to which options
                   1515:  * will be moved, and return value is their length.
                   1516:  * XXX should be deleted; last arg currently ignored.
                   1517:  */
1.8       mycroft  1518: void
1.1       cgd      1519: ip_stripoptions(m, mopt)
1.109     augustss 1520:        struct mbuf *m;
1.1       cgd      1521:        struct mbuf *mopt;
                   1522: {
1.109     augustss 1523:        int i;
1.1       cgd      1524:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1525:        caddr_t opts;
1.1       cgd      1526:        int olen;
                   1527:
1.79      mycroft  1528:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1529:        opts = (caddr_t)(ip + 1);
                   1530:        i = m->m_len - (sizeof (struct ip) + olen);
                   1531:        bcopy(opts  + olen, opts, (unsigned)i);
                   1532:        m->m_len -= olen;
                   1533:        if (m->m_flags & M_PKTHDR)
                   1534:                m->m_pkthdr.len -= olen;
1.155     itojun   1535:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1536:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1537: }
                   1538:
1.139     matt     1539: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1540:        0,              0,              0,              0,
                   1541:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1542:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1543:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1544:        0,              0,              0,              0,
                   1545:        ENOPROTOOPT
                   1546: };
                   1547:
                   1548: /*
                   1549:  * Forward a packet.  If some error occurs return the sender
                   1550:  * an icmp packet.  Note we can't always generate a meaningful
                   1551:  * icmp message because icmp doesn't have a large enough repertoire
                   1552:  * of codes and types.
                   1553:  *
                   1554:  * If not forwarding, just drop the packet.  This could be confusing
                   1555:  * if ipforwarding was zero but some routing protocol was advancing
                   1556:  * us as a gateway to somewhere.  However, we must let the routing
                   1557:  * protocol deal with that.
                   1558:  *
                   1559:  * The srcrt parameter indicates whether the packet is being forwarded
                   1560:  * via a source route.
                   1561:  */
1.13      mycroft  1562: void
1.1       cgd      1563: ip_forward(m, srcrt)
                   1564:        struct mbuf *m;
                   1565:        int srcrt;
                   1566: {
1.109     augustss 1567:        struct ip *ip = mtod(m, struct ip *);
                   1568:        struct sockaddr_in *sin;
                   1569:        struct rtentry *rt;
1.28      christos 1570:        int error, type = 0, code = 0;
1.1       cgd      1571:        struct mbuf *mcopy;
1.13      mycroft  1572:        n_long dest;
                   1573:        struct ifnet *destifp;
1.89      itojun   1574: #ifdef IPSEC
                   1575:        struct ifnet dummyifp;
                   1576: #endif
1.164     matt     1577:
                   1578:        /*
                   1579:         * We are now in the output path.
                   1580:         */
                   1581:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1582:
                   1583:        /*
                   1584:         * Clear any in-bound checksum flags for this packet.
                   1585:         */
                   1586:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1587:
1.13      mycroft  1588:        dest = 0;
1.1       cgd      1589: #ifdef DIAGNOSTIC
                   1590:        if (ipprintfs)
1.70      thorpej  1591:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1592:                    ntohl(ip->ip_src.s_addr),
                   1593:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1594: #endif
1.93      sommerfe 1595:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1596:                ipstat.ips_cantforward++;
                   1597:                m_freem(m);
                   1598:                return;
                   1599:        }
                   1600:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1601:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1602:                return;
                   1603:        }
                   1604:        ip->ip_ttl -= IPTTLDEC;
                   1605:
1.19      mycroft  1606:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1607:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1608:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1609:                if (ipforward_rt.ro_rt) {
                   1610:                        RTFREE(ipforward_rt.ro_rt);
                   1611:                        ipforward_rt.ro_rt = 0;
                   1612:                }
                   1613:                sin->sin_family = AF_INET;
1.35      mycroft  1614:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1615:                sin->sin_addr = ip->ip_dst;
                   1616:
                   1617:                rtalloc(&ipforward_rt);
                   1618:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1619:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1620:                        return;
                   1621:                }
                   1622:                rt = ipforward_rt.ro_rt;
                   1623:        }
                   1624:
                   1625:        /*
1.34      mycroft  1626:         * Save at most 68 bytes of the packet in case
1.1       cgd      1627:         * we need to generate an ICMP message to the src.
1.119     itojun   1628:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1629:         */
1.155     itojun   1630:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1631:        if (mcopy)
                   1632:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1633:
                   1634:        /*
                   1635:         * If forwarding packet using same interface that it came in on,
                   1636:         * perhaps should send a redirect to sender to shortcut a hop.
                   1637:         * Only send redirect if source is sending directly to us,
                   1638:         * and if packet was not source routed (or has any options).
                   1639:         * Also, don't send redirect if forwarding using a default route
                   1640:         * or a route modified by a redirect.
                   1641:         */
                   1642:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1643:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1644:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1645:            ipsendredirects && !srcrt) {
1.19      mycroft  1646:                if (rt->rt_ifa &&
                   1647:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1648:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1649:                        if (rt->rt_flags & RTF_GATEWAY)
                   1650:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1651:                        else
                   1652:                                dest = ip->ip_dst.s_addr;
                   1653:                        /*
                   1654:                         * Router requirements says to only send host
                   1655:                         * redirects.
                   1656:                         */
                   1657:                        type = ICMP_REDIRECT;
                   1658:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1659: #ifdef DIAGNOSTIC
1.77      thorpej  1660:                        if (ipprintfs)
                   1661:                                printf("redirect (%d) to %x\n", code,
                   1662:                                    (u_int32_t)dest);
1.1       cgd      1663: #endif
                   1664:                }
                   1665:        }
                   1666:
1.89      itojun   1667: #ifdef IPSEC
1.134     lukem    1668:        /* Don't lookup socket in forwarding case */
1.127     itojun   1669:        (void)ipsec_setsocket(m, NULL);
1.103     itojun   1670: #endif
1.27      thorpej  1671:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
                   1672:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1       cgd      1673:        if (error)
                   1674:                ipstat.ips_cantforward++;
                   1675:        else {
                   1676:                ipstat.ips_forward++;
                   1677:                if (type)
                   1678:                        ipstat.ips_redirectsent++;
                   1679:                else {
1.63      matt     1680:                        if (mcopy) {
                   1681: #ifdef GATEWAY
1.64      thorpej  1682:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1683:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1684: #endif
1.1       cgd      1685:                                m_freem(mcopy);
1.63      matt     1686:                        }
1.1       cgd      1687:                        return;
                   1688:                }
                   1689:        }
                   1690:        if (mcopy == NULL)
                   1691:                return;
1.13      mycroft  1692:        destifp = NULL;
                   1693:
1.1       cgd      1694:        switch (error) {
                   1695:
                   1696:        case 0:                         /* forwarded, but need redirect */
                   1697:                /* type, code set above */
                   1698:                break;
                   1699:
                   1700:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1701:        case EHOSTUNREACH:
                   1702:        case ENETDOWN:
                   1703:        case EHOSTDOWN:
                   1704:        default:
                   1705:                type = ICMP_UNREACH;
                   1706:                code = ICMP_UNREACH_HOST;
                   1707:                break;
                   1708:
                   1709:        case EMSGSIZE:
                   1710:                type = ICMP_UNREACH;
                   1711:                code = ICMP_UNREACH_NEEDFRAG;
1.89      itojun   1712: #ifndef IPSEC
1.13      mycroft  1713:                if (ipforward_rt.ro_rt)
                   1714:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1715: #else
                   1716:                /*
                   1717:                 * If the packet is routed over IPsec tunnel, tell the
                   1718:                 * originator the tunnel MTU.
                   1719:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1720:                 * XXX quickhack!!!
                   1721:                 */
                   1722:                if (ipforward_rt.ro_rt) {
                   1723:                        struct secpolicy *sp;
                   1724:                        int ipsecerror;
1.95      itojun   1725:                        size_t ipsechdr;
1.89      itojun   1726:                        struct route *ro;
                   1727:
                   1728:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.95      itojun   1729:                                                    IPSEC_DIR_OUTBOUND,
                   1730:                                                    IP_FORWARDING,
                   1731:                                                    &ipsecerror);
1.89      itojun   1732:
                   1733:                        if (sp == NULL)
                   1734:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1735:                        else {
                   1736:                                /* count IPsec header size */
1.95      itojun   1737:                                ipsechdr = ipsec4_hdrsiz(mcopy,
                   1738:                                                         IPSEC_DIR_OUTBOUND,
                   1739:                                                         NULL);
1.89      itojun   1740:
                   1741:                                /*
                   1742:                                 * find the correct route for outer IPv4
                   1743:                                 * header, compute tunnel MTU.
                   1744:                                 *
                   1745:                                 * XXX BUG ALERT
                   1746:                                 * The "dummyifp" code relies upon the fact
                   1747:                                 * that icmp_error() touches only ifp->if_mtu.
                   1748:                                 */
                   1749:                                /*XXX*/
                   1750:                                destifp = NULL;
                   1751:                                if (sp->req != NULL
1.95      itojun   1752:                                 && sp->req->sav != NULL
                   1753:                                 && sp->req->sav->sah != NULL) {
                   1754:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1755:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1756:                                                dummyifp.if_mtu =
1.151     itojun   1757:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1758:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1759:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1760:                                                dummyifp.if_mtu -= ipsechdr;
                   1761:                                                destifp = &dummyifp;
                   1762:                                        }
                   1763:                                }
                   1764:
                   1765:                                key_freesp(sp);
                   1766:                        }
                   1767:                }
                   1768: #endif /*IPSEC*/
1.1       cgd      1769:                ipstat.ips_cantfrag++;
                   1770:                break;
                   1771:
                   1772:        case ENOBUFS:
1.143     itojun   1773: #if 1
                   1774:                /*
                   1775:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1776:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1777:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1778:                 * or if the underlying interface is rate-limited.
1.143     itojun   1779:                 */
                   1780:                if (mcopy)
                   1781:                        m_freem(mcopy);
                   1782:                return;
                   1783: #else
1.1       cgd      1784:                type = ICMP_SOURCEQUENCH;
                   1785:                code = 0;
                   1786:                break;
1.143     itojun   1787: #endif
1.1       cgd      1788:        }
1.13      mycroft  1789:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1790: }
                   1791:
                   1792: void
                   1793: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1794:        struct inpcb *inp;
                   1795:        struct mbuf **mp;
                   1796:        struct ip *ip;
                   1797:        struct mbuf *m;
1.44      thorpej  1798: {
                   1799:
                   1800:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1801:                struct timeval tv;
                   1802:
                   1803:                microtime(&tv);
                   1804:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1805:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1806:                if (*mp)
                   1807:                        mp = &(*mp)->m_next;
                   1808:        }
                   1809:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1810:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1811:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1812:                if (*mp)
                   1813:                        mp = &(*mp)->m_next;
                   1814:        }
                   1815: #ifdef notyet
                   1816:        /*
                   1817:         * XXX
                   1818:         * Moving these out of udp_input() made them even more broken
                   1819:         * than they already were.
                   1820:         *      - fenner@parc.xerox.com
                   1821:         */
                   1822:        /* options were tossed already */
                   1823:        if (inp->inp_flags & INP_RECVOPTS) {
                   1824:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1825:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1826:                if (*mp)
                   1827:                        mp = &(*mp)->m_next;
                   1828:        }
                   1829:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1830:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1831:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1832:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1833:                if (*mp)
                   1834:                        mp = &(*mp)->m_next;
                   1835:        }
                   1836: #endif
                   1837:        if (inp->inp_flags & INP_RECVIF) {
                   1838:                struct sockaddr_dl sdl;
                   1839:
                   1840:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1841:                sdl.sdl_family = AF_LINK;
                   1842:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1843:                    m->m_pkthdr.rcvif->if_index : 0;
                   1844:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1845:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1846:                    IP_RECVIF, IPPROTO_IP);
                   1847:                if (*mp)
                   1848:                        mp = &(*mp)->m_next;
                   1849:        }
1.13      mycroft  1850: }
                   1851:
                   1852: int
                   1853: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1854:        int *name;
                   1855:        u_int namelen;
                   1856:        void *oldp;
                   1857:        size_t *oldlenp;
                   1858:        void *newp;
                   1859:        size_t newlen;
                   1860: {
1.88      sommerfe 1861:        extern int subnetsarelocal, hostzeroisbroadcast;
1.52      thorpej  1862:
1.54      lukem    1863:        int error, old;
                   1864:
1.13      mycroft  1865:        /* All sysctl names at this level are terminal. */
                   1866:        if (namelen != 1)
                   1867:                return (ENOTDIR);
                   1868:
                   1869:        switch (name[0]) {
                   1870:        case IPCTL_FORWARDING:
                   1871:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
                   1872:        case IPCTL_SENDREDIRECTS:
                   1873:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1874:                        &ipsendredirects));
                   1875:        case IPCTL_DEFTTL:
                   1876:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
                   1877: #ifdef notyet
                   1878:        case IPCTL_DEFMTU:
                   1879:                return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
                   1880: #endif
1.26      thorpej  1881:        case IPCTL_FORWSRCRT:
1.47      cjs      1882:                /* Don't allow this to change in a secure environment.  */
1.26      thorpej  1883:                if (securelevel > 0)
1.46      cjs      1884:                        return (sysctl_rdint(oldp, oldlenp, newp,
                   1885:                            ip_forwsrcrt));
                   1886:                else
                   1887:                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1888:                            &ip_forwsrcrt));
1.27      thorpej  1889:        case IPCTL_DIRECTEDBCAST:
                   1890:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1891:                    &ip_directedbcast));
1.47      cjs      1892:        case IPCTL_ALLOWSRCRT:
                   1893:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1894:                    &ip_allowsrcrt));
1.52      thorpej  1895:        case IPCTL_SUBNETSARELOCAL:
                   1896:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1897:                    &subnetsarelocal));
1.53      kml      1898:        case IPCTL_MTUDISC:
1.60      kml      1899:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1900:                    &ip_mtudisc);
1.163     itojun   1901:                if (error == 0 && ip_mtudisc == 0)
                   1902:                        rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60      kml      1903:                return error;
1.54      lukem    1904:        case IPCTL_ANONPORTMIN:
                   1905:                old = anonportmin;
                   1906:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118     itojun   1907:                if (anonportmin >= anonportmax || anonportmin < 0
                   1908:                    || anonportmin > 65535
1.54      lukem    1909: #ifndef IPNOPRIVPORTS
                   1910:                    || anonportmin < IPPORT_RESERVED
                   1911: #endif
                   1912:                    ) {
                   1913:                        anonportmin = old;
                   1914:                        return (EINVAL);
                   1915:                }
                   1916:                return (error);
                   1917:        case IPCTL_ANONPORTMAX:
                   1918:                old = anonportmax;
                   1919:                error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118     itojun   1920:                if (anonportmin >= anonportmax || anonportmax < 0
                   1921:                    || anonportmax > 65535
1.54      lukem    1922: #ifndef IPNOPRIVPORTS
                   1923:                    || anonportmax < IPPORT_RESERVED
                   1924: #endif
                   1925:                    ) {
                   1926:                        anonportmax = old;
                   1927:                        return (EINVAL);
                   1928:                }
1.60      kml      1929:                return (error);
                   1930:        case IPCTL_MTUDISCTIMEOUT:
1.158     itojun   1931:                old = ip_mtudisc_timeout;
1.60      kml      1932:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1933:                   &ip_mtudisc_timeout);
1.158     itojun   1934:                if (ip_mtudisc_timeout < 0) {
                   1935:                        ip_mtudisc_timeout = old;
1.156     itojun   1936:                        return (EINVAL);
1.158     itojun   1937:                }
1.163     itojun   1938:                if (error == 0)
1.162     itojun   1939:                        rt_timer_queue_change(ip_mtudisc_timeout_q,
                   1940:                                              ip_mtudisc_timeout);
1.54      lukem    1941:                return (error);
1.65      matt     1942: #ifdef GATEWAY
                   1943:        case IPCTL_MAXFLOWS:
1.67      thorpej  1944:            {
                   1945:                int s;
                   1946:
1.65      matt     1947:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1948:                   &ip_maxflows);
1.67      thorpej  1949:                s = splsoftnet();
1.65      matt     1950:                ipflow_reap(0);
1.67      thorpej  1951:                splx(s);
1.65      matt     1952:                return (error);
1.67      thorpej  1953:            }
1.89      itojun   1954: #endif
1.90      itojun   1955:        case IPCTL_HOSTZEROBROADCAST:
                   1956:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1957:                    &hostzeroisbroadcast));
1.89      itojun   1958: #if NGIF > 0
                   1959:        case IPCTL_GIF_TTL:
1.157     itojun   1960:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.90      itojun   1961:                                  &ip_gif_ttl));
1.144     martin   1962: #endif
                   1963:
                   1964: #if NGRE > 0
                   1965:        case IPCTL_GRE_TTL:
1.157     itojun   1966:                return (sysctl_int(oldp, oldlenp, newp, newlen,
1.144     martin   1967:                                  &ip_gre_ttl));
1.117     tron     1968: #endif
                   1969:
                   1970: #ifndef IPNOPRIVPORTS
                   1971:        case IPCTL_LOWPORTMIN:
                   1972:                old = lowportmin;
                   1973:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
                   1974:                if (lowportmin >= lowportmax
                   1975:                    || lowportmin > IPPORT_RESERVEDMAX
                   1976:                    || lowportmin < IPPORT_RESERVEDMIN
                   1977:                    ) {
                   1978:                        lowportmin = old;
                   1979:                        return (EINVAL);
                   1980:                }
                   1981:                return (error);
                   1982:        case IPCTL_LOWPORTMAX:
                   1983:                old = lowportmax;
                   1984:                error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
                   1985:                if (lowportmin >= lowportmax
                   1986:                    || lowportmax > IPPORT_RESERVEDMAX
                   1987:                    || lowportmax < IPPORT_RESERVEDMIN
                   1988:                    ) {
                   1989:                        lowportmax = old;
                   1990:                        return (EINVAL);
                   1991:                }
                   1992:                return (error);
1.65      matt     1993: #endif
1.131     itojun   1994:
                   1995:        case IPCTL_MAXFRAGPACKETS:
                   1996:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   1997:                    &ip_maxfragpackets));
1.88      sommerfe 1998:
1.165     christos 1999:        case IPCTL_CHECKINTERFACE:
                   2000:                return (sysctl_int(oldp, oldlenp, newp, newlen,
                   2001:                    &ip_checkinterface));
1.13      mycroft  2002:        default:
                   2003:                return (EOPNOTSUPP);
                   2004:        }
                   2005:        /* NOTREACHED */
1.1       cgd      2006: }

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