[BACK]Return to ip_input.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / netinet

Annotation of src/sys/netinet/ip_input.c, Revision 1.191

1.191   ! jonathan    1: /*     $NetBSD: ip_input.c,v 1.190 2003/12/06 23:56:10 jonathan Exp $  */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  * 3. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the NetBSD
                     51:  *     Foundation, Inc. and its contributors.
                     52:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     53:  *    contributors may be used to endorse or promote products derived
                     54:  *    from this software without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     57:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     58:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     59:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     60:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     61:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     62:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     63:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     64:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     65:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     66:  * POSSIBILITY OF SUCH DAMAGE.
                     67:  */
1.14      cgd        68:
1.1       cgd        69: /*
1.13      mycroft    70:  * Copyright (c) 1982, 1986, 1988, 1993
                     71:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
1.172     agc        81:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        82:  *    may be used to endorse or promote products derived from this software
                     83:  *    without specific prior written permission.
                     84:  *
                     85:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     86:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     87:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     88:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     89:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     90:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     91:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     92:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     93:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     94:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     95:  * SUCH DAMAGE.
                     96:  *
1.14      cgd        97:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        98:  */
1.141     lukem      99:
                    100: #include <sys/cdefs.h>
1.191   ! jonathan  101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.190 2003/12/06 23:56:10 jonathan Exp $");
1.55      scottr    102:
1.184     jonathan  103: #include "opt_inet.h"
1.62      matt      104: #include "opt_gateway.h"
1.69      mrg       105: #include "opt_pfil_hooks.h"
1.91      thorpej   106: #include "opt_ipsec.h"
1.55      scottr    107: #include "opt_mrouting.h"
1.167     martin    108: #include "opt_mbuftrace.h"
1.135     thorpej   109: #include "opt_inet_csum.h"
1.1       cgd       110:
1.5       mycroft   111: #include <sys/param.h>
                    112: #include <sys/systm.h>
                    113: #include <sys/malloc.h>
                    114: #include <sys/mbuf.h>
                    115: #include <sys/domain.h>
                    116: #include <sys/protosw.h>
                    117: #include <sys/socket.h>
1.44      thorpej   118: #include <sys/socketvar.h>
1.5       mycroft   119: #include <sys/errno.h>
                    120: #include <sys/time.h>
                    121: #include <sys/kernel.h>
1.72      thorpej   122: #include <sys/pool.h>
1.28      christos  123: #include <sys/sysctl.h>
1.1       cgd       124:
1.5       mycroft   125: #include <net/if.h>
1.44      thorpej   126: #include <net/if_dl.h>
1.5       mycroft   127: #include <net/route.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
                    134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
                    136: #include <netinet/ip_icmp.h>
1.89      itojun    137: /* just for gif_ttl */
                    138: #include <netinet/in_gif.h>
                    139: #include "gif.h"
1.144     martin    140: #include <net/if_gre.h>
                    141: #include "gre.h"
1.111     jdolecek  142:
                    143: #ifdef MROUTING
                    144: #include <netinet/ip_mroute.h>
                    145: #endif
1.89      itojun    146:
                    147: #ifdef IPSEC
                    148: #include <netinet6/ipsec.h>
                    149: #include <netkey/key.h>
                    150: #endif
1.173     jonathan  151: #ifdef FAST_IPSEC
                    152: #include <netipsec/ipsec.h>
                    153: #include <netipsec/key.h>
                    154: #endif /* FAST_IPSEC*/
1.44      thorpej   155:
1.1       cgd       156: #ifndef        IPFORWARDING
                    157: #ifdef GATEWAY
                    158: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    159: #else /* GATEWAY */
                    160: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    161: #endif /* GATEWAY */
                    162: #endif /* IPFORWARDING */
                    163: #ifndef        IPSENDREDIRECTS
                    164: #define        IPSENDREDIRECTS 1
                    165: #endif
1.26      thorpej   166: #ifndef IPFORWSRCRT
1.47      cjs       167: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    168: #endif
                    169: #ifndef IPALLOWSRCRT
1.48      mrg       170: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   171: #endif
1.53      kml       172: #ifndef IPMTUDISC
1.153     itojun    173: #define IPMTUDISC      1
1.53      kml       174: #endif
1.60      kml       175: #ifndef IPMTUDISCTIMEOUT
1.61      kml       176: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       177: #endif
1.53      kml       178:
1.27      thorpej   179: /*
                    180:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    181:  * configuration using this option will Just Work.
                    182:  */
                    183: #ifndef IPDIRECTEDBCAST
                    184: #ifdef DIRECTED_BROADCAST
                    185: #define IPDIRECTEDBCAST        1
                    186: #else
                    187: #define        IPDIRECTEDBCAST 0
                    188: #endif /* DIRECTED_BROADCAST */
                    189: #endif /* IPDIRECTEDBCAST */
1.1       cgd       190: int    ipforwarding = IPFORWARDING;
                    191: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   192: int    ip_defttl = IPDEFTTL;
1.26      thorpej   193: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   194: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       195: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       196: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    197: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       198: #ifdef DIAGNOSTIC
                    199: int    ipprintfs = 0;
                    200: #endif
1.184     jonathan  201:
                    202: int    ip_do_randomid = 0;
                    203:
1.165     christos  204: /*
                    205:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    206:  * the Strong ES model described in RFC 1122, but since the routing table
                    207:  * and transmit implementation do not implement the Strong ES model,
                    208:  * setting this to 1 results in an odd hybrid.
                    209:  *
                    210:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    211:  * to translate the destination address to another local interface.
                    212:  *
                    213:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    214:  * to the loopback interface instead of the interface where the
                    215:  * packets for those addresses are received.
                    216:  */
                    217: int    ip_checkinterface = 0;
                    218:
1.1       cgd       219:
1.60      kml       220: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    221:
1.1       cgd       222: extern struct domain inetdomain;
                    223: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      224: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    225: int    in_ifaddrentries;                       /* total number of addrs */
1.181     jonathan  226: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       227: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      228: u_long in_multihash;                           /* size of hash table - 1 */
                    229: int    in_multientries;                        /* total number of addrs */
                    230: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   231: struct ifqueue ipintrq;
1.63      matt      232: struct ipstat  ipstat;
1.183     jonathan  233: uint16_t ip_id;
1.75      thorpej   234:
1.121     thorpej   235: #ifdef PFIL_HOOKS
                    236: struct pfil_head inet_pfil_hook;
                    237: #endif
                    238:
1.190     jonathan  239: /* IP datagram reassembly queues (hashed) */
                    240: #define IPREASS_NHASH_LOG2      6
                    241: #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
                    242: #define IPREASS_HMASK           (IPREASS_NHASH - 1)
                    243: #define IPREASS_HASH(x,y) \
                    244:        (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
                    245: struct ipqhead ipq[IPREASS_NHASH];
                    246: #ifdef notyet
                    247: static int    nipq = 0;         /* total # of reass queues */
                    248: #endif
1.75      thorpej   249: int    ipq_locked;
1.131     itojun    250: int    ip_nfragpackets = 0;
1.133     itojun    251: int    ip_maxfragpackets = 200;
1.75      thorpej   252:
                    253: static __inline int ipq_lock_try __P((void));
                    254: static __inline void ipq_unlock __P((void));
                    255:
                    256: static __inline int
                    257: ipq_lock_try()
                    258: {
                    259:        int s;
                    260:
1.132     thorpej   261:        /*
1.149     wiz       262:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   263:         * mbuf allocation.
                    264:         */
                    265:        s = splvm();
1.75      thorpej   266:        if (ipq_locked) {
                    267:                splx(s);
                    268:                return (0);
                    269:        }
                    270:        ipq_locked = 1;
                    271:        splx(s);
                    272:        return (1);
                    273: }
                    274:
                    275: static __inline void
                    276: ipq_unlock()
                    277: {
                    278:        int s;
                    279:
1.132     thorpej   280:        s = splvm();
1.75      thorpej   281:        ipq_locked = 0;
                    282:        splx(s);
                    283: }
                    284:
                    285: #ifdef DIAGNOSTIC
                    286: #define        IPQ_LOCK()                                                      \
                    287: do {                                                                   \
                    288:        if (ipq_lock_try() == 0) {                                      \
                    289:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    290:                panic("ipq_lock");                                      \
                    291:        }                                                               \
1.159     perry     292: } while (/*CONSTCOND*/ 0)
1.75      thorpej   293: #define        IPQ_LOCK_CHECK()                                                \
                    294: do {                                                                   \
                    295:        if (ipq_locked == 0) {                                          \
                    296:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    297:                panic("ipq lock check");                                \
                    298:        }                                                               \
1.159     perry     299: } while (/*CONSTCOND*/ 0)
1.75      thorpej   300: #else
                    301: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    302: #define        IPQ_LOCK_CHECK()        /* nothing */
                    303: #endif
                    304:
                    305: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       306:
1.166     matt      307: struct pool inmulti_pool;
1.72      thorpej   308: struct pool ipqent_pool;
                    309:
1.135     thorpej   310: #ifdef INET_CSUM_COUNTERS
                    311: #include <sys/device.h>
                    312:
                    313: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    314:     NULL, "inet", "hwcsum bad");
                    315: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    316:     NULL, "inet", "hwcsum ok");
                    317: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    318:     NULL, "inet", "swcsum");
                    319:
                    320: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    321:
                    322: #else
                    323:
                    324: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    325:
                    326: #endif /* INET_CSUM_COUNTERS */
                    327:
1.1       cgd       328: /*
                    329:  * We need to save the IP options in case a protocol wants to respond
                    330:  * to an incoming packet over the same route if the packet got here
                    331:  * using IP source routing.  This allows connection establishment and
                    332:  * maintenance when the remote end is on a network that is not known
                    333:  * to us.
                    334:  */
                    335: int    ip_nhops = 0;
                    336: static struct ip_srcrt {
                    337:        struct  in_addr dst;                    /* final destination */
                    338:        char    nop;                            /* one NOP to align */
                    339:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    340:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    341: } ip_srcrt;
                    342:
1.13      mycroft   343: static void save_rte __P((u_char *, struct in_addr));
1.35      mycroft   344:
1.164     matt      345: #ifdef MBUFTRACE
                    346: struct mowner ip_rx_mowner = { "internet", "rx" };
                    347: struct mowner ip_tx_mowner = { "internet", "tx" };
                    348: #endif
                    349:
1.1       cgd       350: /*
                    351:  * IP initialization: fill in IP protocol switch table.
                    352:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    353:  */
1.8       mycroft   354: void
1.1       cgd       355: ip_init()
                    356: {
1.109     augustss  357:        struct protosw *pr;
                    358:        int i;
1.1       cgd       359:
1.166     matt      360:        pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
                    361:            NULL);
1.72      thorpej   362:        pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146     thorpej   363:            NULL);
1.72      thorpej   364:
1.1       cgd       365:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    366:        if (pr == 0)
                    367:                panic("ip_init");
                    368:        for (i = 0; i < IPPROTO_MAX; i++)
                    369:                ip_protox[i] = pr - inetsw;
                    370:        for (pr = inetdomain.dom_protosw;
                    371:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    372:                if (pr->pr_domain->dom_family == PF_INET &&
                    373:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    374:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.190     jonathan  375:        for (i = 0; i < IPREASS_NHASH; i++)
                    376:                LIST_INIT(&ipq[i]);
                    377:
1.183     jonathan  378:        ip_id = time.tv_sec & 0xfffff;
1.1       cgd       379:        ipintrq.ifq_maxlen = ipqmaxlen;
1.181     jonathan  380:        TAILQ_INIT(&in_ifaddrhead);
1.120     ad        381:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
                    382:            M_WAITOK, &in_ifaddrhash);
1.166     matt      383:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
                    384:            M_WAITOK, &in_multihash);
1.160     itojun    385:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   386: #ifdef GATEWAY
                    387:        ipflow_init();
                    388: #endif
1.121     thorpej   389:
                    390: #ifdef PFIL_HOOKS
                    391:        /* Register our Packet Filter hook. */
1.126     thorpej   392:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    393:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   394:        i = pfil_head_register(&inet_pfil_hook);
                    395:        if (i != 0)
                    396:                printf("ip_init: WARNING: unable to register pfil hook, "
                    397:                    "error %d\n", i);
                    398: #endif /* PFIL_HOOKS */
1.135     thorpej   399:
                    400: #ifdef INET_CSUM_COUNTERS
                    401:        evcnt_attach_static(&ip_hwcsum_bad);
                    402:        evcnt_attach_static(&ip_hwcsum_ok);
                    403:        evcnt_attach_static(&ip_swcsum);
                    404: #endif /* INET_CSUM_COUNTERS */
1.164     matt      405:
                    406: #ifdef MBUFTRACE
                    407:        MOWNER_ATTACH(&ip_tx_mowner);
                    408:        MOWNER_ATTACH(&ip_rx_mowner);
                    409: #endif /* MBUFTRACE */
1.1       cgd       410: }
                    411:
                    412: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
                    413: struct route ipforward_rt;
                    414:
                    415: /*
1.89      itojun    416:  * IP software interrupt routine
                    417:  */
                    418: void
                    419: ipintr()
                    420: {
                    421:        int s;
                    422:        struct mbuf *m;
                    423:
                    424:        while (1) {
1.132     thorpej   425:                s = splnet();
1.89      itojun    426:                IF_DEQUEUE(&ipintrq, m);
                    427:                splx(s);
                    428:                if (m == 0)
                    429:                        return;
1.164     matt      430:                MCLAIM(m, &ip_rx_mowner);
1.89      itojun    431:                ip_input(m);
                    432:        }
                    433: }
                    434:
                    435: /*
1.1       cgd       436:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    437:  * try to reassemble.  Process options.  Pass to next level.
                    438:  */
1.8       mycroft   439: void
1.89      itojun    440: ip_input(struct mbuf *m)
1.1       cgd       441: {
1.109     augustss  442:        struct ip *ip = NULL;
                    443:        struct ipq *fp;
                    444:        struct in_ifaddr *ia;
                    445:        struct ifaddr *ifa;
1.25      cgd       446:        struct ipqent *ipqe;
1.89      itojun    447:        int hlen = 0, mff, len;
1.100     itojun    448:        int downmatch;
1.165     christos  449:        int checkif;
1.169     itojun    450:        int srcrt = 0;
1.190     jonathan  451:        u_int hash;
1.173     jonathan  452: #ifdef FAST_IPSEC
                    453:        struct m_tag *mtag;
                    454:        struct tdb_ident *tdbi;
                    455:        struct secpolicy *sp;
                    456:        int s, error;
                    457: #endif /* FAST_IPSEC */
1.1       cgd       458:
1.164     matt      459:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       460: #ifdef DIAGNOSTIC
                    461:        if ((m->m_flags & M_PKTHDR) == 0)
                    462:                panic("ipintr no HDR");
1.89      itojun    463: #endif
1.164     matt      464:
1.1       cgd       465:        /*
                    466:         * If no IP addresses have been set yet but the interfaces
                    467:         * are receiving, can't do anything with incoming packets yet.
                    468:         */
1.181     jonathan  469:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       470:                goto bad;
                    471:        ipstat.ips_total++;
1.154     thorpej   472:        /*
                    473:         * If the IP header is not aligned, slurp it up into a new
                    474:         * mbuf with space for link headers, in the event we forward
                    475:         * it.  Otherwise, if it is aligned, make sure the entire
                    476:         * base IP header is in the first mbuf of the chain.
                    477:         */
                    478:        if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    479:                if ((m = m_copyup(m, sizeof(struct ip),
                    480:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    481:                        /* XXXJRT new stat, please */
                    482:                        ipstat.ips_toosmall++;
                    483:                        return;
                    484:                }
                    485:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    486:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
                    487:                        ipstat.ips_toosmall++;
                    488:                        return;
                    489:                }
1.1       cgd       490:        }
                    491:        ip = mtod(m, struct ip *);
1.13      mycroft   492:        if (ip->ip_v != IPVERSION) {
                    493:                ipstat.ips_badvers++;
                    494:                goto bad;
                    495:        }
1.1       cgd       496:        hlen = ip->ip_hl << 2;
                    497:        if (hlen < sizeof(struct ip)) { /* minimum header length */
                    498:                ipstat.ips_badhlen++;
                    499:                goto bad;
                    500:        }
                    501:        if (hlen > m->m_len) {
                    502:                if ((m = m_pullup(m, hlen)) == 0) {
                    503:                        ipstat.ips_badhlen++;
1.89      itojun    504:                        return;
1.1       cgd       505:                }
                    506:                ip = mtod(m, struct ip *);
                    507:        }
1.98      thorpej   508:
1.85      hwr       509:        /*
1.99      thorpej   510:         * RFC1122: packets with a multicast source address are
1.98      thorpej   511:         * not allowed.
1.85      hwr       512:         */
                    513:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130     itojun    514:                ipstat.ips_badaddr++;
1.85      hwr       515:                goto bad;
1.129     itojun    516:        }
                    517:
                    518:        /* 127/8 must not appear on wire - RFC1122 */
                    519:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    520:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    521:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    522:                        ipstat.ips_badaddr++;
1.129     itojun    523:                        goto bad;
1.130     itojun    524:                }
1.85      hwr       525:        }
                    526:
1.135     thorpej   527:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   528:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   529:                 M_CSUM_IPv4_BAD)) {
                    530:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    531:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    532:                goto badcsum;
                    533:
                    534:        case M_CSUM_IPv4:
                    535:                /* Checksum was okay. */
                    536:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    537:                break;
                    538:
                    539:        default:
                    540:                /* Must compute it ourselves. */
                    541:                INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    542:                if (in_cksum(m, hlen) != 0)
                    543:                        goto bad;
                    544:                break;
1.1       cgd       545:        }
                    546:
1.121     thorpej   547:        /* Retrieve the packet length. */
                    548:        len = ntohs(ip->ip_len);
1.81      proff     549:
                    550:        /*
                    551:         * Check for additional length bogosity
                    552:         */
1.84      proff     553:        if (len < hlen) {
1.81      proff     554:                ipstat.ips_badlen++;
                    555:                goto bad;
                    556:        }
1.1       cgd       557:
                    558:        /*
                    559:         * Check that the amount of data in the buffers
                    560:         * is as at least much as the IP header would have us expect.
                    561:         * Trim mbufs if longer than we expect.
                    562:         * Drop packet if shorter than we expect.
                    563:         */
1.35      mycroft   564:        if (m->m_pkthdr.len < len) {
1.1       cgd       565:                ipstat.ips_tooshort++;
                    566:                goto bad;
                    567:        }
1.35      mycroft   568:        if (m->m_pkthdr.len > len) {
1.1       cgd       569:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   570:                        m->m_len = len;
                    571:                        m->m_pkthdr.len = len;
1.1       cgd       572:                } else
1.35      mycroft   573:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       574:        }
                    575:
1.188     scw       576: #if defined(IPSEC) || defined(FAST_IPSEC)
1.149     wiz       577:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    578:        m->m_flags &= ~M_CANFASTFWD;
                    579: #else
1.64      thorpej   580:        /*
                    581:         * Assume that we can create a fast-forward IP flow entry
                    582:         * based on this packet.
                    583:         */
                    584:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    585: #endif
1.64      thorpej   586:
1.36      mrg       587: #ifdef PFIL_HOOKS
1.33      mrg       588:        /*
1.64      thorpej   589:         * Run through list of hooks for input packets.  If there are any
                    590:         * filters which require that additional packets in the flow are
                    591:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    592:         * Note that filters must _never_ set this flag, as another filter
                    593:         * in the list may have previously cleared it.
1.33      mrg       594:         */
1.127     itojun    595:        /*
                    596:         * let ipfilter look at packet on the wire,
                    597:         * not the decapsulated packet.
                    598:         */
                    599: #ifdef IPSEC
1.136     itojun    600:        if (!ipsec_getnhist(m))
1.186     scw       601: #elif defined(FAST_IPSEC)
                    602:        if (!ipsec_indone(m))
1.127     itojun    603: #else
                    604:        if (1)
                    605: #endif
                    606:        {
1.169     itojun    607:                struct in_addr odst;
                    608:
                    609:                odst = ip->ip_dst;
1.127     itojun    610:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    611:                    PFIL_IN) != 0)
                    612:                        return;
1.127     itojun    613:                if (m == NULL)
                    614:                        return;
                    615:                ip = mtod(m, struct ip *);
1.142     darrenr   616:                hlen = ip->ip_hl << 2;
1.169     itojun    617:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    618:        }
1.36      mrg       619: #endif /* PFIL_HOOKS */
1.123     thorpej   620:
                    621: #ifdef ALTQ
                    622:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    623:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    624:                /* packet dropped by traffic conditioner */
                    625:                return;
                    626:        }
                    627: #endif
1.121     thorpej   628:
                    629:        /*
1.1       cgd       630:         * Process options and, if not destined for us,
                    631:         * ship it on.  ip_dooptions returns 1 when an
                    632:         * error was detected (causing an icmp message
                    633:         * to be sent and the original packet to be freed).
                    634:         */
                    635:        ip_nhops = 0;           /* for source routed packets */
                    636:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    637:                return;
1.1       cgd       638:
                    639:        /*
1.165     christos  640:         * Enable a consistency check between the destination address
                    641:         * and the arrival interface for a unicast packet (the RFC 1122
                    642:         * strong ES model) if IP forwarding is disabled and the packet
                    643:         * is not locally generated.
                    644:         *
                    645:         * XXX - Checking also should be disabled if the destination
                    646:         * address is ipnat'ed to a different interface.
                    647:         *
                    648:         * XXX - Checking is incompatible with IP aliases added
                    649:         * to the loopback interface instead of the interface where
                    650:         * the packets are received.
                    651:         *
                    652:         * XXX - We need to add a per ifaddr flag for this so that
                    653:         * we get finer grain control.
                    654:         */
                    655:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    656:            (m->m_pkthdr.rcvif != NULL) &&
                    657:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    658:
                    659:        /*
1.1       cgd       660:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    661:         *
                    662:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    663:         * The behavior here is to treat addresses on !IFF_UP interface
                    664:         * as not mine.
1.1       cgd       665:         */
1.100     itojun    666:        downmatch = 0;
1.140     matt      667:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    668:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  669:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    670:                                continue;
1.97      itojun    671:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    672:                                break;
1.100     itojun    673:                        else
                    674:                                downmatch++;
1.97      itojun    675:                }
                    676:        }
1.86      thorpej   677:        if (ia != NULL)
                    678:                goto ours;
1.57      tls       679:        if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140     matt      680:                TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
                    681:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    682:                                continue;
1.57      tls       683:                        ia = ifatoia(ifa);
1.35      mycroft   684:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    685:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   686:                            /*
                    687:                             * Look for all-0's host part (old broadcast addr),
                    688:                             * either for subnet or net.
                    689:                             */
                    690:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   691:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       692:                                goto ours;
1.57      tls       693:                        /*
                    694:                         * An interface with IP address zero accepts
                    695:                         * all packets that arrive on that interface.
                    696:                         */
                    697:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    698:                                goto ours;
1.1       cgd       699:                }
                    700:        }
1.18      mycroft   701:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   702:                struct in_multi *inm;
                    703: #ifdef MROUTING
                    704:                extern struct socket *ip_mrouter;
1.10      brezak    705:
1.147     matt      706:                if (M_READONLY(m)) {
1.10      brezak    707:                        if ((m = m_pullup(m, hlen)) == 0) {
                    708:                                ipstat.ips_toosmall++;
1.89      itojun    709:                                return;
1.10      brezak    710:                        }
                    711:                        ip = mtod(m, struct ip *);
                    712:                }
1.4       hpeyerl   713:
                    714:                if (ip_mrouter) {
                    715:                        /*
                    716:                         * If we are acting as a multicast router, all
                    717:                         * incoming multicast packets are passed to the
                    718:                         * kernel-level multicast forwarding function.
                    719:                         * The packet is returned (relatively) intact; if
                    720:                         * ip_mforward() returns a non-zero value, the packet
                    721:                         * must be discarded, else it may be accepted below.
                    722:                         *
                    723:                         * (The IP ident field is put in the same byte order
                    724:                         * as expected when ip_mforward() is called from
                    725:                         * ip_output().)
                    726:                         */
1.13      mycroft   727:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
                    728:                                ipstat.ips_cantforward++;
1.4       hpeyerl   729:                                m_freem(m);
1.89      itojun    730:                                return;
1.4       hpeyerl   731:                        }
                    732:
                    733:                        /*
                    734:                         * The process-level routing demon needs to receive
                    735:                         * all multicast IGMP packets, whether or not this
                    736:                         * host belongs to their destination groups.
                    737:                         */
                    738:                        if (ip->ip_p == IPPROTO_IGMP)
                    739:                                goto ours;
1.13      mycroft   740:                        ipstat.ips_forward++;
1.4       hpeyerl   741:                }
                    742: #endif
                    743:                /*
                    744:                 * See if we belong to the destination multicast group on the
                    745:                 * arrival interface.
                    746:                 */
                    747:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    748:                if (inm == NULL) {
1.13      mycroft   749:                        ipstat.ips_cantforward++;
1.4       hpeyerl   750:                        m_freem(m);
1.89      itojun    751:                        return;
1.4       hpeyerl   752:                }
                    753:                goto ours;
                    754:        }
1.19      mycroft   755:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   756:            in_nullhost(ip->ip_dst))
1.1       cgd       757:                goto ours;
                    758:
                    759:        /*
                    760:         * Not for us; forward if possible and desirable.
                    761:         */
                    762:        if (ipforwarding == 0) {
                    763:                ipstat.ips_cantforward++;
                    764:                m_freem(m);
1.100     itojun    765:        } else {
                    766:                /*
                    767:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    768:                 * and there's no IFF_UP interface that matches ip_dst,
                    769:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    770:                 * forwarding loop till TTL goes to 0.
                    771:                 */
                    772:                if (downmatch) {
                    773:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
                    774:                        ipstat.ips_cantforward++;
                    775:                        return;
                    776:                }
1.145     itojun    777: #ifdef IPSEC
                    778:                if (ipsec4_in_reject(m, NULL)) {
                    779:                        ipsecstat.in_polvio++;
                    780:                        goto bad;
                    781:                }
                    782: #endif
1.173     jonathan  783: #ifdef FAST_IPSEC
                    784:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    785:                s = splsoftnet();
                    786:                if (mtag != NULL) {
                    787:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    788:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    789:                } else {
                    790:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    791:                                                   IP_FORWARDING, &error);
                    792:                }
                    793:                if (sp == NULL) {       /* NB: can happen if error */
                    794:                        splx(s);
                    795:                        /*XXX error stat???*/
                    796:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    797:                        goto bad;
                    798:                }
                    799:
                    800:                /*
                    801:                 * Check security policy against packet attributes.
                    802:                 */
                    803:                error = ipsec_in_reject(sp, m);
                    804:                KEY_FREESP(&sp);
                    805:                splx(s);
                    806:                if (error) {
                    807:                        ipstat.ips_cantforward++;
                    808:                        goto bad;
                    809:                }
                    810: #endif /* FAST_IPSEC */
1.145     itojun    811:
1.169     itojun    812:                ip_forward(m, srcrt);
1.100     itojun    813:        }
1.89      itojun    814:        return;
1.1       cgd       815:
                    816: ours:
                    817:        /*
                    818:         * If offset or IP_MF are set, must reassemble.
                    819:         * Otherwise, nothing need be done.
                    820:         * (We could look in the reassembly queue to see
                    821:         * if the packet was previously fragmented,
                    822:         * but it's not worth the time; just let them time out.)
                    823:         */
1.155     itojun    824:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
                    825:                if (M_READONLY(m)) {
                    826:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    827:                                ipstat.ips_toosmall++;
                    828:                                goto bad;
                    829:                        }
                    830:                        ip = mtod(m, struct ip *);
                    831:                }
                    832:
1.1       cgd       833:                /*
                    834:                 * Look for queue of fragments
                    835:                 * of this datagram.
                    836:                 */
1.75      thorpej   837:                IPQ_LOCK();
1.190     jonathan  838:                hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
                    839:                /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
                    840:                for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
                    841:                     fp = LIST_NEXT(fp, ipq_q)) {
1.1       cgd       842:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   843:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    844:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1       cgd       845:                            ip->ip_p == fp->ipq_p)
                    846:                                goto found;
1.190     jonathan  847:
                    848:                }
1.1       cgd       849:                fp = 0;
                    850: found:
                    851:
                    852:                /*
                    853:                 * Adjust ip_len to not reflect header,
1.25      cgd       854:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       855:                 * convert offset of this to bytes.
                    856:                 */
1.155     itojun    857:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    858:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       859:                if (mff) {
1.16      cgd       860:                        /*
                    861:                         * Make sure that fragments have a data length
                    862:                         * that's a non-zero multiple of 8 bytes.
                    863:                         */
1.155     itojun    864:                        if (ntohs(ip->ip_len) == 0 ||
                    865:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.16      cgd       866:                                ipstat.ips_badfrags++;
1.75      thorpej   867:                                IPQ_UNLOCK();
1.16      cgd       868:                                goto bad;
                    869:                        }
                    870:                }
1.155     itojun    871:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       872:
                    873:                /*
                    874:                 * If datagram marked as having more fragments
                    875:                 * or if this is not the first fragment,
                    876:                 * attempt reassembly; if it succeeds, proceed.
                    877:                 */
1.155     itojun    878:                if (mff || ip->ip_off != htons(0)) {
1.1       cgd       879:                        ipstat.ips_fragments++;
1.72      thorpej   880:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25      cgd       881:                        if (ipqe == NULL) {
                    882:                                ipstat.ips_rcvmemdrop++;
1.75      thorpej   883:                                IPQ_UNLOCK();
1.25      cgd       884:                                goto bad;
                    885:                        }
                    886:                        ipqe->ipqe_mff = mff;
1.50      thorpej   887:                        ipqe->ipqe_m = m;
1.25      cgd       888:                        ipqe->ipqe_ip = ip;
1.190     jonathan  889:                        m = ip_reass(ipqe, fp, &ipq[hash]);
1.75      thorpej   890:                        if (m == 0) {
                    891:                                IPQ_UNLOCK();
1.89      itojun    892:                                return;
1.75      thorpej   893:                        }
1.13      mycroft   894:                        ipstat.ips_reassembled++;
1.50      thorpej   895:                        ip = mtod(m, struct ip *);
1.74      thorpej   896:                        hlen = ip->ip_hl << 2;
1.155     itojun    897:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       898:                } else
                    899:                        if (fp)
                    900:                                ip_freef(fp);
1.75      thorpej   901:                IPQ_UNLOCK();
1.79      mycroft   902:        }
1.128     itojun    903:
1.173     jonathan  904: #if defined(IPSEC)
1.128     itojun    905:        /*
                    906:         * enforce IPsec policy checking if we are seeing last header.
                    907:         * note that we do not visit this with protocols with pcb layer
                    908:         * code - like udp/tcp/raw ip.
                    909:         */
                    910:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                    911:            ipsec4_in_reject(m, NULL)) {
                    912:                ipsecstat.in_polvio++;
                    913:                goto bad;
                    914:        }
                    915: #endif
1.173     jonathan  916: #if FAST_IPSEC
                    917:        /*
                    918:         * enforce IPsec policy checking if we are seeing last header.
                    919:         * note that we do not visit this with protocols with pcb layer
                    920:         * code - like udp/tcp/raw ip.
                    921:         */
                    922:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                    923:                /*
                    924:                 * Check if the packet has already had IPsec processing
                    925:                 * done.  If so, then just pass it along.  This tag gets
                    926:                 * set during AH, ESP, etc. input handling, before the
                    927:                 * packet is returned to the ip input queue for delivery.
                    928:                 */
                    929:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    930:                s = splsoftnet();
                    931:                if (mtag != NULL) {
                    932:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    933:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    934:                } else {
                    935:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    936:                                                   IP_FORWARDING, &error);
                    937:                }
                    938:                if (sp != NULL) {
                    939:                        /*
                    940:                         * Check security policy against packet attributes.
                    941:                         */
                    942:                        error = ipsec_in_reject(sp, m);
                    943:                        KEY_FREESP(&sp);
                    944:                } else {
                    945:                        /* XXX error stat??? */
                    946:                        error = EINVAL;
                    947: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                    948:                        goto bad;
                    949:                }
                    950:                splx(s);
                    951:                if (error)
                    952:                        goto bad;
                    953:        }
                    954: #endif /* FAST_IPSEC */
1.1       cgd       955:
                    956:        /*
                    957:         * Switch out to protocol's input routine.
                    958:         */
1.82      aidan     959: #if IFA_STATS
1.122     itojun    960:        if (ia && ip)
1.155     itojun    961:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     962: #endif
1.1       cgd       963:        ipstat.ips_delivered++;
1.89      itojun    964:     {
                    965:        int off = hlen, nh = ip->ip_p;
                    966:
                    967:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                    968:        return;
                    969:     }
1.1       cgd       970: bad:
                    971:        m_freem(m);
1.135     thorpej   972:        return;
                    973:
                    974: badcsum:
                    975:        ipstat.ips_badsum++;
                    976:        m_freem(m);
1.1       cgd       977: }
                    978:
                    979: /*
                    980:  * Take incoming datagram fragment and try to
                    981:  * reassemble it into whole datagram.  If a chain for
                    982:  * reassembly of this datagram already exists, then it
                    983:  * is given as fp; otherwise have to make a chain.
                    984:  */
1.50      thorpej   985: struct mbuf *
1.190     jonathan  986: ip_reass(ipqe, fp, ipqhead)
1.109     augustss  987:        struct ipqent *ipqe;
                    988:        struct ipq *fp;
1.190     jonathan  989:        struct ipqhead *ipqhead;
1.1       cgd       990: {
1.109     augustss  991:        struct mbuf *m = ipqe->ipqe_m;
                    992:        struct ipqent *nq, *p, *q;
1.25      cgd       993:        struct ip *ip;
1.1       cgd       994:        struct mbuf *t;
1.25      cgd       995:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1       cgd       996:        int i, next;
                    997:
1.75      thorpej   998:        IPQ_LOCK_CHECK();
                    999:
1.1       cgd      1000:        /*
                   1001:         * Presence of header sizes in mbufs
                   1002:         * would confuse code below.
                   1003:         */
                   1004:        m->m_data += hlen;
                   1005:        m->m_len -= hlen;
                   1006:
                   1007:        /*
                   1008:         * If first fragment to arrive, create a reassembly queue.
                   1009:         */
                   1010:        if (fp == 0) {
1.131     itojun   1011:                /*
                   1012:                 * Enforce upper bound on number of fragmented packets
                   1013:                 * for which we attempt reassembly;
                   1014:                 * If maxfrag is 0, never accept fragments.
                   1015:                 * If maxfrag is -1, accept all fragments without limitation.
                   1016:                 */
                   1017:                if (ip_maxfragpackets < 0)
                   1018:                        ;
                   1019:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1020:                        goto dropfrag;
                   1021:                ip_nfragpackets++;
1.50      thorpej  1022:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1023:                    M_FTABLE, M_NOWAIT);
                   1024:                if (fp == NULL)
1.1       cgd      1025:                        goto dropfrag;
1.190     jonathan 1026:                LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.1       cgd      1027:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1028:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1029:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148     matt     1030:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1031:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1032:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1033:                p = NULL;
1.1       cgd      1034:                goto insert;
                   1035:        }
                   1036:
                   1037:        /*
                   1038:         * Find a segment which begins after this one does.
                   1039:         */
1.148     matt     1040:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1041:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1042:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1043:                        break;
                   1044:
                   1045:        /*
                   1046:         * If there is a preceding segment, it may provide some of
                   1047:         * our data already.  If so, drop the data from the incoming
                   1048:         * segment.  If it provides all of our data, drop us.
                   1049:         */
1.25      cgd      1050:        if (p != NULL) {
1.155     itojun   1051:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1052:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1053:                if (i > 0) {
1.155     itojun   1054:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1055:                                goto dropfrag;
1.50      thorpej  1056:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1057:                        ipqe->ipqe_ip->ip_off =
                   1058:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1059:                        ipqe->ipqe_ip->ip_len =
                   1060:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1061:                }
                   1062:        }
                   1063:
                   1064:        /*
                   1065:         * While we overlap succeeding segments trim them or,
                   1066:         * if they are completely covered, dequeue them.
                   1067:         */
1.155     itojun   1068:        for (; q != NULL &&
                   1069:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1070:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1071:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1072:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1073:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1074:                        q->ipqe_ip->ip_len =
                   1075:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1076:                        q->ipqe_ip->ip_off =
                   1077:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1078:                        m_adj(q->ipqe_m, i);
1.1       cgd      1079:                        break;
                   1080:                }
1.148     matt     1081:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1082:                m_freem(q->ipqe_m);
1.148     matt     1083:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1084:                pool_put(&ipqent_pool, q);
1.1       cgd      1085:        }
                   1086:
                   1087: insert:
                   1088:        /*
                   1089:         * Stick new segment in its place;
                   1090:         * check for complete reassembly.
                   1091:         */
1.25      cgd      1092:        if (p == NULL) {
1.148     matt     1093:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1094:        } else {
1.148     matt     1095:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1096:        }
1.1       cgd      1097:        next = 0;
1.148     matt     1098:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1099:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1100:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1101:                        return (0);
1.155     itojun   1102:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1103:        }
1.25      cgd      1104:        if (p->ipqe_mff)
1.1       cgd      1105:                return (0);
                   1106:
                   1107:        /*
1.41      thorpej  1108:         * Reassembly is complete.  Check for a bogus message size and
                   1109:         * concatenate fragments.
1.1       cgd      1110:         */
1.148     matt     1111:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1112:        ip = q->ipqe_ip;
1.41      thorpej  1113:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
                   1114:                ipstat.ips_toolong++;
                   1115:                ip_freef(fp);
                   1116:                return (0);
                   1117:        }
1.50      thorpej  1118:        m = q->ipqe_m;
1.1       cgd      1119:        t = m->m_next;
                   1120:        m->m_next = 0;
                   1121:        m_cat(m, t);
1.148     matt     1122:        nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1123:        pool_put(&ipqent_pool, q);
1.25      cgd      1124:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1125:                t = q->ipqe_m;
1.148     matt     1126:                nq = TAILQ_NEXT(q, ipqe_q);
1.72      thorpej  1127:                pool_put(&ipqent_pool, q);
1.1       cgd      1128:                m_cat(m, t);
                   1129:        }
                   1130:
                   1131:        /*
                   1132:         * Create header for new ip packet by
                   1133:         * modifying header of first packet;
                   1134:         * dequeue and discard fragment reassembly header.
                   1135:         * Make header visible.
                   1136:         */
1.155     itojun   1137:        ip->ip_len = htons(next);
1.25      cgd      1138:        ip->ip_src = fp->ipq_src;
                   1139:        ip->ip_dst = fp->ipq_dst;
                   1140:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1141:        FREE(fp, M_FTABLE);
1.131     itojun   1142:        ip_nfragpackets--;
1.1       cgd      1143:        m->m_len += (ip->ip_hl << 2);
                   1144:        m->m_data -= (ip->ip_hl << 2);
                   1145:        /* some debugging cruft by sklower, below, will go away soon */
                   1146:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1147:                int plen = 0;
1.50      thorpej  1148:                for (t = m; t; t = t->m_next)
                   1149:                        plen += t->m_len;
                   1150:                m->m_pkthdr.len = plen;
1.1       cgd      1151:        }
1.50      thorpej  1152:        return (m);
1.1       cgd      1153:
                   1154: dropfrag:
                   1155:        ipstat.ips_fragdropped++;
                   1156:        m_freem(m);
1.72      thorpej  1157:        pool_put(&ipqent_pool, ipqe);
1.1       cgd      1158:        return (0);
                   1159: }
                   1160:
                   1161: /*
                   1162:  * Free a fragment reassembly header and all
                   1163:  * associated datagrams.
                   1164:  */
1.8       mycroft  1165: void
1.1       cgd      1166: ip_freef(fp)
                   1167:        struct ipq *fp;
                   1168: {
1.109     augustss 1169:        struct ipqent *q, *p;
1.1       cgd      1170:
1.75      thorpej  1171:        IPQ_LOCK_CHECK();
                   1172:
1.148     matt     1173:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1174:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1175:                m_freem(q->ipqe_m);
1.148     matt     1176:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72      thorpej  1177:                pool_put(&ipqent_pool, q);
1.1       cgd      1178:        }
1.25      cgd      1179:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1180:        FREE(fp, M_FTABLE);
1.131     itojun   1181:        ip_nfragpackets--;
1.1       cgd      1182: }
                   1183:
                   1184: /*
                   1185:  * IP timer processing;
                   1186:  * if a timer expires on a reassembly
                   1187:  * queue, discard it.
                   1188:  */
1.8       mycroft  1189: void
1.1       cgd      1190: ip_slowtimo()
                   1191: {
1.191   ! jonathan 1192:        static u_int dropscanidx = 0;
        !          1193:        u_int i;
1.109     augustss 1194:        struct ipq *fp, *nfp;
1.24      mycroft  1195:        int s = splsoftnet();
1.1       cgd      1196:
1.75      thorpej  1197:        IPQ_LOCK();
1.190     jonathan 1198:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1199:                for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
                   1200:                        nfp = LIST_NEXT(fp, ipq_q);
                   1201:                        if (--fp->ipq_ttl == 0) {
                   1202:                                ipstat.ips_fragtimeout++;
                   1203:                                ip_freef(fp);
                   1204:                        }
1.1       cgd      1205:                }
                   1206:        }
1.131     itojun   1207:        /*
                   1208:         * If we are over the maximum number of fragments
                   1209:         * (due to the limit being lowered), drain off
1.190     jonathan 1210:         * enough to get down to the new limit. Start draining
                   1211:         * from the reassembly hashqueue most recently drained.
1.131     itojun   1212:         */
                   1213:        if (ip_maxfragpackets < 0)
                   1214:                ;
                   1215:        else {
1.190     jonathan 1216:                int wrapped = 0;
                   1217:
                   1218:                i = dropscanidx;
                   1219:                while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
                   1220:                        while (LIST_FIRST(&ipq[i]) != NULL)
                   1221:                                ip_freef(LIST_FIRST(&ipq[i]));
                   1222:                        if (++i >= IPREASS_NHASH) {
                   1223:                                i = 0;
                   1224:                        }
                   1225:                        /*
                   1226:                         * Dont scan forever even if fragment counters are
                   1227:                         * wrong: stop after scanning entire reassembly queue.
                   1228:                         */
                   1229:                        if (i == dropscanidx)
                   1230:                            wrapped = 1;
                   1231:                }
                   1232:                dropscanidx = i;
1.131     itojun   1233:        }
1.75      thorpej  1234:        IPQ_UNLOCK();
1.63      matt     1235: #ifdef GATEWAY
                   1236:        ipflow_slowtimo();
                   1237: #endif
1.1       cgd      1238:        splx(s);
                   1239: }
                   1240:
                   1241: /*
                   1242:  * Drain off all datagram fragments.
                   1243:  */
1.8       mycroft  1244: void
1.1       cgd      1245: ip_drain()
                   1246: {
1.190     jonathan 1247:        int i;
1.1       cgd      1248:
1.75      thorpej  1249:        /*
                   1250:         * We may be called from a device's interrupt context.  If
                   1251:         * the ipq is already busy, just bail out now.
                   1252:         */
                   1253:        if (ipq_lock_try() == 0)
                   1254:                return;
                   1255:
1.190     jonathan 1256:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1257:                struct ipqhead *ipqh = &ipq[i];
                   1258:                struct ipq *fp, *nfp;
                   1259:                for (fp = LIST_FIRST(ipqh); fp != NULL; fp = nfp) {
                   1260:                        nfp = LIST_NEXT(fp, ipq_q);
                   1261:                        ip_freef(fp);
                   1262:                        ipstat.ips_fragdropped++;
                   1263:                }
1.1       cgd      1264:        }
1.75      thorpej  1265:
                   1266:        IPQ_UNLOCK();
1.1       cgd      1267: }
                   1268:
                   1269: /*
                   1270:  * Do option processing on a datagram,
                   1271:  * possibly discarding it if bad options are encountered,
                   1272:  * or forwarding it if source-routed.
                   1273:  * Returns 1 if packet has been forwarded/freed,
                   1274:  * 0 if the packet should be processed further.
                   1275:  */
1.8       mycroft  1276: int
1.1       cgd      1277: ip_dooptions(m)
                   1278:        struct mbuf *m;
                   1279: {
1.109     augustss 1280:        struct ip *ip = mtod(m, struct ip *);
                   1281:        u_char *cp, *cp0;
                   1282:        struct ip_timestamp *ipt;
                   1283:        struct in_ifaddr *ia;
1.1       cgd      1284:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1285:        struct in_addr dst;
1.1       cgd      1286:        n_time ntime;
                   1287:
1.13      mycroft  1288:        dst = ip->ip_dst;
1.1       cgd      1289:        cp = (u_char *)(ip + 1);
                   1290:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1291:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1292:                opt = cp[IPOPT_OPTVAL];
                   1293:                if (opt == IPOPT_EOL)
                   1294:                        break;
                   1295:                if (opt == IPOPT_NOP)
                   1296:                        optlen = 1;
                   1297:                else {
1.113     itojun   1298:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1299:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1300:                                goto bad;
                   1301:                        }
1.1       cgd      1302:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1303:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1304:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1305:                                goto bad;
                   1306:                        }
                   1307:                }
                   1308:                switch (opt) {
                   1309:
                   1310:                default:
                   1311:                        break;
                   1312:
                   1313:                /*
                   1314:                 * Source routing with record.
                   1315:                 * Find interface with current destination address.
                   1316:                 * If none on this machine then drop if strictly routed,
                   1317:                 * or do nothing if loosely routed.
                   1318:                 * Record interface address and bring up next address
                   1319:                 * component.  If strictly routed make sure next
                   1320:                 * address is on directly accessible net.
                   1321:                 */
                   1322:                case IPOPT_LSRR:
                   1323:                case IPOPT_SSRR:
1.47      cjs      1324:                        if (ip_allowsrcrt == 0) {
                   1325:                                type = ICMP_UNREACH;
                   1326:                                code = ICMP_UNREACH_NET_PROHIB;
                   1327:                                goto bad;
                   1328:                        }
1.114     itojun   1329:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1330:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1331:                                goto bad;
                   1332:                        }
1.1       cgd      1333:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1334:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1335:                                goto bad;
                   1336:                        }
                   1337:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1338:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1339:                        if (ia == 0) {
                   1340:                                if (opt == IPOPT_SSRR) {
                   1341:                                        type = ICMP_UNREACH;
                   1342:                                        code = ICMP_UNREACH_SRCFAIL;
                   1343:                                        goto bad;
                   1344:                                }
                   1345:                                /*
                   1346:                                 * Loose routing, and not at next destination
                   1347:                                 * yet; nothing to do except forward.
                   1348:                                 */
                   1349:                                break;
                   1350:                        }
                   1351:                        off--;                  /* 0 origin */
1.112     sommerfe 1352:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1353:                                /*
                   1354:                                 * End of source route.  Should be for us.
                   1355:                                 */
                   1356:                                save_rte(cp, ip->ip_src);
                   1357:                                break;
                   1358:                        }
                   1359:                        /*
                   1360:                         * locate outgoing interface
                   1361:                         */
                   1362:                        bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
                   1363:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1364:                        if (opt == IPOPT_SSRR)
                   1365:                                ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
                   1366:                        else
1.1       cgd      1367:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1368:                        if (ia == 0) {
                   1369:                                type = ICMP_UNREACH;
                   1370:                                code = ICMP_UNREACH_SRCFAIL;
                   1371:                                goto bad;
                   1372:                        }
                   1373:                        ip->ip_dst = ipaddr.sin_addr;
1.20      mycroft  1374:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1375:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1376:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1377:                        /*
                   1378:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1379:                         */
1.18      mycroft  1380:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1381:                        break;
                   1382:
                   1383:                case IPOPT_RR:
1.114     itojun   1384:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1385:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1386:                                goto bad;
                   1387:                        }
1.1       cgd      1388:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1389:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1390:                                goto bad;
                   1391:                        }
                   1392:                        /*
                   1393:                         * If no space remains, ignore.
                   1394:                         */
                   1395:                        off--;                  /* 0 origin */
1.112     sommerfe 1396:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1397:                                break;
                   1398:                        bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
                   1399:                            sizeof(ipaddr.sin_addr));
                   1400:                        /*
                   1401:                         * locate outgoing interface; if we're the destination,
                   1402:                         * use the incoming interface (should be same).
                   1403:                         */
1.96      thorpej  1404:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1405:                            == NULL &&
                   1406:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1407:                                type = ICMP_UNREACH;
                   1408:                                code = ICMP_UNREACH_HOST;
                   1409:                                goto bad;
                   1410:                        }
1.20      mycroft  1411:                        bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1       cgd      1412:                            (caddr_t)(cp + off), sizeof(struct in_addr));
                   1413:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1414:                        break;
                   1415:
                   1416:                case IPOPT_TS:
                   1417:                        code = cp - (u_char *)ip;
                   1418:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1419:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1420:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1421:                                goto bad;
1.114     itojun   1422:                        }
                   1423:                        if (ipt->ipt_ptr < 5) {
                   1424:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1425:                                goto bad;
                   1426:                        }
1.15      cgd      1427:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1428:                                if (++ipt->ipt_oflw == 0) {
                   1429:                                        code = (u_char *)&ipt->ipt_ptr -
                   1430:                                            (u_char *)ip;
1.1       cgd      1431:                                        goto bad;
1.114     itojun   1432:                                }
1.1       cgd      1433:                                break;
                   1434:                        }
1.104     thorpej  1435:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1436:                        switch (ipt->ipt_flg) {
                   1437:
                   1438:                        case IPOPT_TS_TSONLY:
                   1439:                                break;
                   1440:
                   1441:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1442:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1443:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1444:                                        code = (u_char *)&ipt->ipt_ptr -
                   1445:                                            (u_char *)ip;
1.1       cgd      1446:                                        goto bad;
1.114     itojun   1447:                                }
1.13      mycroft  1448:                                ipaddr.sin_addr = dst;
1.96      thorpej  1449:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1450:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1451:                                if (ia == 0)
                   1452:                                        continue;
1.104     thorpej  1453:                                bcopy(&ia->ia_addr.sin_addr,
                   1454:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1455:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1456:                                break;
                   1457:
                   1458:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1459:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1460:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1461:                                        code = (u_char *)&ipt->ipt_ptr -
                   1462:                                            (u_char *)ip;
1.1       cgd      1463:                                        goto bad;
1.114     itojun   1464:                                }
1.104     thorpej  1465:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1466:                                    sizeof(struct in_addr));
1.96      thorpej  1467:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1468:                                    == NULL)
1.1       cgd      1469:                                        continue;
                   1470:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1471:                                break;
                   1472:
                   1473:                        default:
1.114     itojun   1474:                                /* XXX can't take &ipt->ipt_flg */
                   1475:                                code = (u_char *)&ipt->ipt_ptr -
                   1476:                                    (u_char *)ip + 1;
1.1       cgd      1477:                                goto bad;
                   1478:                        }
                   1479:                        ntime = iptime();
1.107     thorpej  1480:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
                   1481:                        bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1       cgd      1482:                            sizeof(n_time));
                   1483:                        ipt->ipt_ptr += sizeof(n_time);
                   1484:                }
                   1485:        }
                   1486:        if (forward) {
1.26      thorpej  1487:                if (ip_forwsrcrt == 0) {
                   1488:                        type = ICMP_UNREACH;
                   1489:                        code = ICMP_UNREACH_SRCFAIL;
                   1490:                        goto bad;
                   1491:                }
1.1       cgd      1492:                ip_forward(m, 1);
                   1493:                return (1);
1.13      mycroft  1494:        }
                   1495:        return (0);
1.1       cgd      1496: bad:
1.13      mycroft  1497:        icmp_error(m, type, code, 0, 0);
                   1498:        ipstat.ips_badoptions++;
1.1       cgd      1499:        return (1);
                   1500: }
                   1501:
                   1502: /*
                   1503:  * Given address of next destination (final or next hop),
                   1504:  * return internet address info of interface to be used to get there.
                   1505:  */
                   1506: struct in_ifaddr *
                   1507: ip_rtaddr(dst)
                   1508:         struct in_addr dst;
                   1509: {
1.109     augustss 1510:        struct sockaddr_in *sin;
1.1       cgd      1511:
1.19      mycroft  1512:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1513:
1.35      mycroft  1514:        if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1       cgd      1515:                if (ipforward_rt.ro_rt) {
                   1516:                        RTFREE(ipforward_rt.ro_rt);
                   1517:                        ipforward_rt.ro_rt = 0;
                   1518:                }
                   1519:                sin->sin_family = AF_INET;
                   1520:                sin->sin_len = sizeof(*sin);
                   1521:                sin->sin_addr = dst;
                   1522:
                   1523:                rtalloc(&ipforward_rt);
                   1524:        }
                   1525:        if (ipforward_rt.ro_rt == 0)
                   1526:                return ((struct in_ifaddr *)0);
1.19      mycroft  1527:        return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1       cgd      1528: }
                   1529:
                   1530: /*
                   1531:  * Save incoming source route for use in replies,
                   1532:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1533:  */
1.13      mycroft  1534: void
1.1       cgd      1535: save_rte(option, dst)
                   1536:        u_char *option;
                   1537:        struct in_addr dst;
                   1538: {
                   1539:        unsigned olen;
                   1540:
                   1541:        olen = option[IPOPT_OLEN];
                   1542: #ifdef DIAGNOSTIC
                   1543:        if (ipprintfs)
1.39      christos 1544:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1545: #endif /* 0 */
1.1       cgd      1546:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1547:                return;
                   1548:        bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
                   1549:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1550:        ip_srcrt.dst = dst;
                   1551: }
                   1552:
                   1553: /*
                   1554:  * Retrieve incoming source route for use in replies,
                   1555:  * in the same form used by setsockopt.
                   1556:  * The first hop is placed before the options, will be removed later.
                   1557:  */
                   1558: struct mbuf *
                   1559: ip_srcroute()
                   1560: {
1.109     augustss 1561:        struct in_addr *p, *q;
                   1562:        struct mbuf *m;
1.1       cgd      1563:
                   1564:        if (ip_nhops == 0)
                   1565:                return ((struct mbuf *)0);
                   1566:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1567:        if (m == 0)
                   1568:                return ((struct mbuf *)0);
                   1569:
1.164     matt     1570:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1571: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1572:
                   1573:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1574:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1575:            OPTSIZ;
                   1576: #ifdef DIAGNOSTIC
                   1577:        if (ipprintfs)
1.39      christos 1578:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1579: #endif
                   1580:
                   1581:        /*
                   1582:         * First save first hop for return route
                   1583:         */
                   1584:        p = &ip_srcrt.route[ip_nhops - 1];
                   1585:        *(mtod(m, struct in_addr *)) = *p--;
                   1586: #ifdef DIAGNOSTIC
                   1587:        if (ipprintfs)
1.39      christos 1588:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1589: #endif
                   1590:
                   1591:        /*
                   1592:         * Copy option fields and padding (nop) to mbuf.
                   1593:         */
                   1594:        ip_srcrt.nop = IPOPT_NOP;
                   1595:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1596:        bcopy((caddr_t)&ip_srcrt.nop,
                   1597:            mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
                   1598:        q = (struct in_addr *)(mtod(m, caddr_t) +
                   1599:            sizeof(struct in_addr) + OPTSIZ);
                   1600: #undef OPTSIZ
                   1601:        /*
                   1602:         * Record return path as an IP source route,
                   1603:         * reversing the path (pointers are now aligned).
                   1604:         */
                   1605:        while (p >= ip_srcrt.route) {
                   1606: #ifdef DIAGNOSTIC
                   1607:                if (ipprintfs)
1.39      christos 1608:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1609: #endif
                   1610:                *q++ = *p--;
                   1611:        }
                   1612:        /*
                   1613:         * Last hop goes to final destination.
                   1614:         */
                   1615:        *q = ip_srcrt.dst;
                   1616: #ifdef DIAGNOSTIC
                   1617:        if (ipprintfs)
1.39      christos 1618:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1619: #endif
                   1620:        return (m);
                   1621: }
                   1622:
                   1623: /*
                   1624:  * Strip out IP options, at higher
                   1625:  * level protocol in the kernel.
                   1626:  * Second argument is buffer to which options
                   1627:  * will be moved, and return value is their length.
                   1628:  * XXX should be deleted; last arg currently ignored.
                   1629:  */
1.8       mycroft  1630: void
1.1       cgd      1631: ip_stripoptions(m, mopt)
1.109     augustss 1632:        struct mbuf *m;
1.1       cgd      1633:        struct mbuf *mopt;
                   1634: {
1.109     augustss 1635:        int i;
1.1       cgd      1636:        struct ip *ip = mtod(m, struct ip *);
1.109     augustss 1637:        caddr_t opts;
1.1       cgd      1638:        int olen;
                   1639:
1.79      mycroft  1640:        olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1       cgd      1641:        opts = (caddr_t)(ip + 1);
                   1642:        i = m->m_len - (sizeof (struct ip) + olen);
                   1643:        bcopy(opts  + olen, opts, (unsigned)i);
                   1644:        m->m_len -= olen;
                   1645:        if (m->m_flags & M_PKTHDR)
                   1646:                m->m_pkthdr.len -= olen;
1.155     itojun   1647:        ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79      mycroft  1648:        ip->ip_hl = sizeof (struct ip) >> 2;
1.1       cgd      1649: }
                   1650:
1.139     matt     1651: const int inetctlerrmap[PRC_NCMDS] = {
1.1       cgd      1652:        0,              0,              0,              0,
                   1653:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1654:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1655:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1656:        0,              0,              0,              0,
                   1657:        ENOPROTOOPT
                   1658: };
                   1659:
                   1660: /*
                   1661:  * Forward a packet.  If some error occurs return the sender
                   1662:  * an icmp packet.  Note we can't always generate a meaningful
                   1663:  * icmp message because icmp doesn't have a large enough repertoire
                   1664:  * of codes and types.
                   1665:  *
                   1666:  * If not forwarding, just drop the packet.  This could be confusing
                   1667:  * if ipforwarding was zero but some routing protocol was advancing
                   1668:  * us as a gateway to somewhere.  However, we must let the routing
                   1669:  * protocol deal with that.
                   1670:  *
                   1671:  * The srcrt parameter indicates whether the packet is being forwarded
                   1672:  * via a source route.
                   1673:  */
1.13      mycroft  1674: void
1.1       cgd      1675: ip_forward(m, srcrt)
                   1676:        struct mbuf *m;
                   1677:        int srcrt;
                   1678: {
1.109     augustss 1679:        struct ip *ip = mtod(m, struct ip *);
                   1680:        struct sockaddr_in *sin;
                   1681:        struct rtentry *rt;
1.28      christos 1682:        int error, type = 0, code = 0;
1.1       cgd      1683:        struct mbuf *mcopy;
1.13      mycroft  1684:        n_long dest;
                   1685:        struct ifnet *destifp;
1.173     jonathan 1686: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89      itojun   1687:        struct ifnet dummyifp;
                   1688: #endif
1.164     matt     1689:
                   1690:        /*
                   1691:         * We are now in the output path.
                   1692:         */
                   1693:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1694:
                   1695:        /*
                   1696:         * Clear any in-bound checksum flags for this packet.
                   1697:         */
                   1698:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1699:
1.13      mycroft  1700:        dest = 0;
1.1       cgd      1701: #ifdef DIAGNOSTIC
                   1702:        if (ipprintfs)
1.70      thorpej  1703:                printf("forward: src %2.2x dst %2.2x ttl %x\n",
                   1704:                    ntohl(ip->ip_src.s_addr),
                   1705:                    ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1       cgd      1706: #endif
1.93      sommerfe 1707:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1       cgd      1708:                ipstat.ips_cantforward++;
                   1709:                m_freem(m);
                   1710:                return;
                   1711:        }
                   1712:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1713:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1714:                return;
                   1715:        }
                   1716:        ip->ip_ttl -= IPTTLDEC;
                   1717:
1.19      mycroft  1718:        sin = satosin(&ipforward_rt.ro_dst);
1.1       cgd      1719:        if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35      mycroft  1720:            !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1       cgd      1721:                if (ipforward_rt.ro_rt) {
                   1722:                        RTFREE(ipforward_rt.ro_rt);
                   1723:                        ipforward_rt.ro_rt = 0;
                   1724:                }
                   1725:                sin->sin_family = AF_INET;
1.35      mycroft  1726:                sin->sin_len = sizeof(struct sockaddr_in);
1.1       cgd      1727:                sin->sin_addr = ip->ip_dst;
                   1728:
                   1729:                rtalloc(&ipforward_rt);
                   1730:                if (ipforward_rt.ro_rt == 0) {
1.13      mycroft  1731:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1       cgd      1732:                        return;
                   1733:                }
                   1734:                rt = ipforward_rt.ro_rt;
                   1735:        }
                   1736:
                   1737:        /*
1.34      mycroft  1738:         * Save at most 68 bytes of the packet in case
1.1       cgd      1739:         * we need to generate an ICMP message to the src.
1.119     itojun   1740:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1741:         */
1.155     itojun   1742:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1743:        if (mcopy)
                   1744:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1745:
                   1746:        /*
                   1747:         * If forwarding packet using same interface that it came in on,
                   1748:         * perhaps should send a redirect to sender to shortcut a hop.
                   1749:         * Only send redirect if source is sending directly to us,
                   1750:         * and if packet was not source routed (or has any options).
                   1751:         * Also, don't send redirect if forwarding using a default route
                   1752:         * or a route modified by a redirect.
                   1753:         */
                   1754:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1755:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35      mycroft  1756:            !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1       cgd      1757:            ipsendredirects && !srcrt) {
1.19      mycroft  1758:                if (rt->rt_ifa &&
                   1759:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1760:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1761:                        if (rt->rt_flags & RTF_GATEWAY)
                   1762:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1763:                        else
                   1764:                                dest = ip->ip_dst.s_addr;
                   1765:                        /*
                   1766:                         * Router requirements says to only send host
                   1767:                         * redirects.
                   1768:                         */
                   1769:                        type = ICMP_REDIRECT;
                   1770:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1771: #ifdef DIAGNOSTIC
1.77      thorpej  1772:                        if (ipprintfs)
                   1773:                                printf("redirect (%d) to %x\n", code,
                   1774:                                    (u_int32_t)dest);
1.1       cgd      1775: #endif
                   1776:                }
                   1777:        }
                   1778:
1.27      thorpej  1779:        error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173     jonathan 1780:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1781:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1782:
1.1       cgd      1783:        if (error)
                   1784:                ipstat.ips_cantforward++;
                   1785:        else {
                   1786:                ipstat.ips_forward++;
                   1787:                if (type)
                   1788:                        ipstat.ips_redirectsent++;
                   1789:                else {
1.63      matt     1790:                        if (mcopy) {
                   1791: #ifdef GATEWAY
1.64      thorpej  1792:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1793:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1794: #endif
1.1       cgd      1795:                                m_freem(mcopy);
1.63      matt     1796:                        }
1.1       cgd      1797:                        return;
                   1798:                }
                   1799:        }
                   1800:        if (mcopy == NULL)
                   1801:                return;
1.13      mycroft  1802:        destifp = NULL;
                   1803:
1.1       cgd      1804:        switch (error) {
                   1805:
                   1806:        case 0:                         /* forwarded, but need redirect */
                   1807:                /* type, code set above */
                   1808:                break;
                   1809:
                   1810:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1811:        case EHOSTUNREACH:
                   1812:        case ENETDOWN:
                   1813:        case EHOSTDOWN:
                   1814:        default:
                   1815:                type = ICMP_UNREACH;
                   1816:                code = ICMP_UNREACH_HOST;
                   1817:                break;
                   1818:
                   1819:        case EMSGSIZE:
                   1820:                type = ICMP_UNREACH;
                   1821:                code = ICMP_UNREACH_NEEDFRAG;
1.173     jonathan 1822: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13      mycroft  1823:                if (ipforward_rt.ro_rt)
                   1824:                        destifp = ipforward_rt.ro_rt->rt_ifp;
1.89      itojun   1825: #else
                   1826:                /*
                   1827:                 * If the packet is routed over IPsec tunnel, tell the
                   1828:                 * originator the tunnel MTU.
                   1829:                 *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1830:                 * XXX quickhack!!!
                   1831:                 */
                   1832:                if (ipforward_rt.ro_rt) {
                   1833:                        struct secpolicy *sp;
                   1834:                        int ipsecerror;
1.95      itojun   1835:                        size_t ipsechdr;
1.89      itojun   1836:                        struct route *ro;
                   1837:
                   1838:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1839:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1840:                            &ipsecerror);
1.89      itojun   1841:
                   1842:                        if (sp == NULL)
                   1843:                                destifp = ipforward_rt.ro_rt->rt_ifp;
                   1844:                        else {
                   1845:                                /* count IPsec header size */
1.95      itojun   1846:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1847:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1848:
                   1849:                                /*
                   1850:                                 * find the correct route for outer IPv4
                   1851:                                 * header, compute tunnel MTU.
                   1852:                                 *
                   1853:                                 * XXX BUG ALERT
                   1854:                                 * The "dummyifp" code relies upon the fact
                   1855:                                 * that icmp_error() touches only ifp->if_mtu.
                   1856:                                 */
                   1857:                                /*XXX*/
                   1858:                                destifp = NULL;
                   1859:                                if (sp->req != NULL
1.95      itojun   1860:                                 && sp->req->sav != NULL
                   1861:                                 && sp->req->sav->sah != NULL) {
                   1862:                                        ro = &sp->req->sav->sah->sa_route;
1.89      itojun   1863:                                        if (ro->ro_rt && ro->ro_rt->rt_ifp) {
                   1864:                                                dummyifp.if_mtu =
1.151     itojun   1865:                                                    ro->ro_rt->rt_rmx.rmx_mtu ?
                   1866:                                                    ro->ro_rt->rt_rmx.rmx_mtu :
1.89      itojun   1867:                                                    ro->ro_rt->rt_ifp->if_mtu;
                   1868:                                                dummyifp.if_mtu -= ipsechdr;
                   1869:                                                destifp = &dummyifp;
                   1870:                                        }
                   1871:                                }
                   1872:
1.173     jonathan 1873: #ifdef IPSEC
1.89      itojun   1874:                                key_freesp(sp);
1.173     jonathan 1875: #else
                   1876:                                KEY_FREESP(&sp);
                   1877: #endif
1.89      itojun   1878:                        }
                   1879:                }
                   1880: #endif /*IPSEC*/
1.1       cgd      1881:                ipstat.ips_cantfrag++;
                   1882:                break;
                   1883:
                   1884:        case ENOBUFS:
1.143     itojun   1885: #if 1
                   1886:                /*
                   1887:                 * a router should not generate ICMP_SOURCEQUENCH as
                   1888:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   1889:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      1890:                 * or if the underlying interface is rate-limited.
1.143     itojun   1891:                 */
                   1892:                if (mcopy)
                   1893:                        m_freem(mcopy);
                   1894:                return;
                   1895: #else
1.1       cgd      1896:                type = ICMP_SOURCEQUENCH;
                   1897:                code = 0;
                   1898:                break;
1.143     itojun   1899: #endif
1.1       cgd      1900:        }
1.13      mycroft  1901:        icmp_error(mcopy, type, code, dest, destifp);
1.44      thorpej  1902: }
                   1903:
                   1904: void
                   1905: ip_savecontrol(inp, mp, ip, m)
1.109     augustss 1906:        struct inpcb *inp;
                   1907:        struct mbuf **mp;
                   1908:        struct ip *ip;
                   1909:        struct mbuf *m;
1.44      thorpej  1910: {
                   1911:
                   1912:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   1913:                struct timeval tv;
                   1914:
                   1915:                microtime(&tv);
                   1916:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1917:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1918:                if (*mp)
                   1919:                        mp = &(*mp)->m_next;
                   1920:        }
                   1921:        if (inp->inp_flags & INP_RECVDSTADDR) {
                   1922:                *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
                   1923:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1924:                if (*mp)
                   1925:                        mp = &(*mp)->m_next;
                   1926:        }
                   1927: #ifdef notyet
                   1928:        /*
                   1929:         * XXX
                   1930:         * Moving these out of udp_input() made them even more broken
                   1931:         * than they already were.
                   1932:         *      - fenner@parc.xerox.com
                   1933:         */
                   1934:        /* options were tossed already */
                   1935:        if (inp->inp_flags & INP_RECVOPTS) {
                   1936:                *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
                   1937:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   1938:                if (*mp)
                   1939:                        mp = &(*mp)->m_next;
                   1940:        }
                   1941:        /* ip_srcroute doesn't do what we want here, need to fix */
                   1942:        if (inp->inp_flags & INP_RECVRETOPTS) {
                   1943:                *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
                   1944:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   1945:                if (*mp)
                   1946:                        mp = &(*mp)->m_next;
                   1947:        }
                   1948: #endif
                   1949:        if (inp->inp_flags & INP_RECVIF) {
                   1950:                struct sockaddr_dl sdl;
                   1951:
                   1952:                sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
                   1953:                sdl.sdl_family = AF_LINK;
                   1954:                sdl.sdl_index = m->m_pkthdr.rcvif ?
                   1955:                    m->m_pkthdr.rcvif->if_index : 0;
                   1956:                sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
                   1957:                *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
                   1958:                    IP_RECVIF, IPPROTO_IP);
                   1959:                if (*mp)
                   1960:                        mp = &(*mp)->m_next;
                   1961:        }
1.13      mycroft  1962: }
                   1963:
1.189     atatat   1964: /*
                   1965:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1966:  * range of the new value and tweaks timers if it changes.
                   1967:  */
                   1968: static int
                   1969: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1970: {
1.189     atatat   1971:        int error, tmp;
                   1972:        struct sysctlnode node;
                   1973:
                   1974:        node = *rnode;
                   1975:        tmp = ip_mtudisc_timeout;
                   1976:        node.sysctl_data = &tmp;
                   1977:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1978:        if (error || newp == NULL)
                   1979:                return (error);
                   1980:        if (tmp < 0)
                   1981:                return (EINVAL);
1.52      thorpej  1982:
1.189     atatat   1983:        ip_mtudisc_timeout = tmp;
                   1984:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1985:
                   1986:        return (0);
                   1987: }
1.54      lukem    1988:
1.65      matt     1989: #ifdef GATEWAY
1.189     atatat   1990: /*
                   1991:  * sysctl helper routine for net.inet.ip.maxflows.  apparently if
                   1992:  * maxflows is even looked up, we "reap flows".
                   1993:  */
                   1994: static int
                   1995: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   1996: {
                   1997:        int s;
1.67      thorpej  1998:
1.189     atatat   1999:        s = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   2000:        if (s)
                   2001:                return (s);
                   2002:
                   2003:        s = splsoftnet();
                   2004:        ipflow_reap(0);
                   2005:        splx(s);
1.144     martin   2006:
1.189     atatat   2007:        return (0);
                   2008: }
                   2009: #endif /* GATEWAY */
1.117     tron     2010:
1.131     itojun   2011:
1.189     atatat   2012: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
                   2013: {
                   2014:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 2015:
1.189     atatat   2016:        sysctl_createv(SYSCTL_PERMANENT,
                   2017:                       CTLTYPE_NODE, "net", NULL,
                   2018:                       NULL, 0, NULL, 0,
                   2019:                       CTL_NET, CTL_EOL);
                   2020:        sysctl_createv(SYSCTL_PERMANENT,
                   2021:                       CTLTYPE_NODE, "inet", NULL,
                   2022:                       NULL, 0, NULL, 0,
                   2023:                       CTL_NET, PF_INET, CTL_EOL);
                   2024:        sysctl_createv(SYSCTL_PERMANENT,
                   2025:                       CTLTYPE_NODE, "ip", NULL,
                   2026:                       NULL, 0, NULL, 0,
                   2027:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
                   2028:
                   2029:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2030:                       CTLTYPE_INT, "forwarding", NULL,
                   2031:                       NULL, 0, &ipforwarding, 0,
                   2032:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2033:                       IPCTL_FORWARDING, CTL_EOL);
                   2034:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2035:                       CTLTYPE_INT, "redirect", NULL,
                   2036:                       NULL, 0, &ipsendredirects, 0,
                   2037:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2038:                       IPCTL_SENDREDIRECTS, CTL_EOL);
                   2039:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2040:                       CTLTYPE_INT, "ttl", NULL,
                   2041:                       NULL, 0, &ip_defttl, 0,
                   2042:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2043:                       IPCTL_DEFTTL, CTL_EOL);
                   2044: #ifdef IPCTL_DEFMTU
                   2045:        sysctl_createv(SYSCTL_PERMANENT /* |SYSCTL_READWRITE? */,
                   2046:                       CTLTYPE_INT, "mtu", NULL,
                   2047:                       NULL, 0, &ip_mtu, 0,
                   2048:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2049:                       IPCTL_DEFMTU, CTL_EOL);
                   2050: #endif /* IPCTL_DEFMTU */
                   2051:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READONLY1,
                   2052:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   2053:                       NULL, 0, &ip_forwsrcrt, 0,
                   2054:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2055:                       IPCTL_FORWSRCRT, CTL_EOL);
                   2056:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2057:                       CTLTYPE_INT, "directed-broadcast", NULL,
                   2058:                       NULL, 0, &ip_directedbcast, 0,
                   2059:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2060:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
                   2061:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2062:                       CTLTYPE_INT, "allowsrcrt", NULL,
                   2063:                       NULL, 0, &ip_allowsrcrt, 0,
                   2064:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2065:                       IPCTL_ALLOWSRCRT, CTL_EOL);
                   2066:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2067:                       CTLTYPE_INT, "subnetsarelocal", NULL,
                   2068:                       NULL, 0, &subnetsarelocal, 0,
                   2069:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2070:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
                   2071:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2072:                       CTLTYPE_INT, "mtudisc", NULL,
                   2073:                       NULL, 0, &ip_mtudisc, 0,
                   2074:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2075:                       IPCTL_MTUDISC, CTL_EOL);
                   2076:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2077:                       CTLTYPE_INT, "anonportmin", NULL,
                   2078:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   2079:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2080:                       IPCTL_ANONPORTMIN, CTL_EOL);
                   2081:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2082:                       CTLTYPE_INT, "anonportmax", NULL,
                   2083:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   2084:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2085:                       IPCTL_ANONPORTMAX, CTL_EOL);
                   2086:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2087:                       CTLTYPE_INT, "mtudisctimeout", NULL,
                   2088:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   2089:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2090:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   2091: #ifdef GATEWAY
                   2092:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2093:                       CTLTYPE_INT, "maxflows", NULL,
                   2094:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   2095:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2096:                       IPCTL_MAXFLOWS, CTL_EOL);
                   2097: #endif /* GATEWAY */
                   2098:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2099:                       CTLTYPE_INT, "hostzerobroadcast", NULL,
                   2100:                       NULL, 0, &hostzeroisbroadcast, 0,
                   2101:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2102:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   2103: #if NGIF > 0
                   2104:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2105:                       CTLTYPE_INT, "gifttl", NULL,
                   2106:                       NULL, 0, &ip_gif_ttl, 0,
                   2107:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2108:                       IPCTL_GIF_TTL, CTL_EOL);
                   2109: #endif /* NGIF */
                   2110: #ifndef IPNOPRIVPORTS
                   2111:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2112:                       CTLTYPE_INT, "lowportmin", NULL,
                   2113:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   2114:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2115:                       IPCTL_LOWPORTMIN, CTL_EOL);
                   2116:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2117:                       CTLTYPE_INT, "lowportmax", NULL,
                   2118:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   2119:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2120:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   2121: #endif /* IPNOPRIVPORTS */
                   2122:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2123:                       CTLTYPE_INT, "maxfragpackets", NULL,
                   2124:                       NULL, 0, &ip_maxfragpackets, 0,
                   2125:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2126:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
                   2127: #if NGRE > 0
                   2128:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2129:                       CTLTYPE_INT, "grettl", NULL,
                   2130:                       NULL, 0, &ip_gre_ttl, 0,
                   2131:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2132:                       IPCTL_GRE_TTL, CTL_EOL);
                   2133: #endif /* NGRE */
                   2134:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2135:                       CTLTYPE_INT, "checkinterface", NULL,
                   2136:                       NULL, 0, &ip_checkinterface, 0,
                   2137:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2138:                       IPCTL_CHECKINTERFACE, CTL_EOL);
                   2139:        sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
                   2140:                       CTLTYPE_INT, "random_id", NULL,
                   2141:                       NULL, 0, &ip_do_randomid, 0,
                   2142:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2143:                       IPCTL_RANDOMID, CTL_EOL);
1.1       cgd      2144: }

CVSweb <webmaster@jp.NetBSD.org>