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Annotation of src/sys/netinet/ip_input.c, Revision 1.266.2.1

1.266.2.1! yamt        1: /*     $NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 thorpej 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:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.266.2.1! yamt       94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 thorpej Exp $");
1.55      scottr     95:
1.184     jonathan   96: #include "opt_inet.h"
1.62      matt       97: #include "opt_gateway.h"
1.69      mrg        98: #include "opt_pfil_hooks.h"
1.91      thorpej    99: #include "opt_ipsec.h"
1.55      scottr    100: #include "opt_mrouting.h"
1.167     martin    101: #include "opt_mbuftrace.h"
1.135     thorpej   102: #include "opt_inet_csum.h"
1.1       cgd       103:
1.5       mycroft   104: #include <sys/param.h>
                    105: #include <sys/systm.h>
                    106: #include <sys/malloc.h>
                    107: #include <sys/mbuf.h>
                    108: #include <sys/domain.h>
                    109: #include <sys/protosw.h>
                    110: #include <sys/socket.h>
1.44      thorpej   111: #include <sys/socketvar.h>
1.5       mycroft   112: #include <sys/errno.h>
                    113: #include <sys/time.h>
                    114: #include <sys/kernel.h>
1.72      thorpej   115: #include <sys/pool.h>
1.28      christos  116: #include <sys/sysctl.h>
1.230     elad      117: #include <sys/kauth.h>
1.1       cgd       118:
1.5       mycroft   119: #include <net/if.h>
1.44      thorpej   120: #include <net/if_dl.h>
1.5       mycroft   121: #include <net/route.h>
1.45      mrg       122: #include <net/pfil.h>
1.1       cgd       123:
1.5       mycroft   124: #include <netinet/in.h>
                    125: #include <netinet/in_systm.h>
                    126: #include <netinet/ip.h>
                    127: #include <netinet/in_pcb.h>
1.215     yamt      128: #include <netinet/in_proto.h>
1.5       mycroft   129: #include <netinet/in_var.h>
                    130: #include <netinet/ip_var.h>
1.266     thorpej   131: #include <netinet/ip_private.h>
1.5       mycroft   132: #include <netinet/ip_icmp.h>
1.89      itojun    133: /* just for gif_ttl */
                    134: #include <netinet/in_gif.h>
                    135: #include "gif.h"
1.144     martin    136: #include <net/if_gre.h>
                    137: #include "gre.h"
1.111     jdolecek  138:
                    139: #ifdef MROUTING
                    140: #include <netinet/ip_mroute.h>
                    141: #endif
1.89      itojun    142:
                    143: #ifdef IPSEC
                    144: #include <netinet6/ipsec.h>
1.266.2.1! yamt      145: #include <netinet6/ipsec_private.h>
1.89      itojun    146: #include <netkey/key.h>
                    147: #endif
1.173     jonathan  148: #ifdef FAST_IPSEC
                    149: #include <netipsec/ipsec.h>
                    150: #include <netipsec/key.h>
                    151: #endif /* FAST_IPSEC*/
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    156: #else /* GATEWAY */
                    157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    158: #endif /* GATEWAY */
                    159: #endif /* IPFORWARDING */
                    160: #ifndef        IPSENDREDIRECTS
                    161: #define        IPSENDREDIRECTS 1
                    162: #endif
1.26      thorpej   163: #ifndef IPFORWSRCRT
1.47      cjs       164: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    165: #endif
                    166: #ifndef IPALLOWSRCRT
1.48      mrg       167: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   168: #endif
1.53      kml       169: #ifndef IPMTUDISC
1.153     itojun    170: #define IPMTUDISC      1
1.53      kml       171: #endif
1.60      kml       172: #ifndef IPMTUDISCTIMEOUT
1.61      kml       173: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       174: #endif
1.53      kml       175:
1.27      thorpej   176: /*
                    177:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    178:  * configuration using this option will Just Work.
                    179:  */
                    180: #ifndef IPDIRECTEDBCAST
                    181: #ifdef DIRECTED_BROADCAST
                    182: #define IPDIRECTEDBCAST        1
                    183: #else
                    184: #define        IPDIRECTEDBCAST 0
                    185: #endif /* DIRECTED_BROADCAST */
                    186: #endif /* IPDIRECTEDBCAST */
1.1       cgd       187: int    ipforwarding = IPFORWARDING;
                    188: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   189: int    ip_defttl = IPDEFTTL;
1.26      thorpej   190: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   191: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       192: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       193: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    194: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       195: #ifdef DIAGNOSTIC
                    196: int    ipprintfs = 0;
                    197: #endif
1.184     jonathan  198:
                    199: int    ip_do_randomid = 0;
                    200:
1.165     christos  201: /*
                    202:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    203:  * the Strong ES model described in RFC 1122, but since the routing table
                    204:  * and transmit implementation do not implement the Strong ES model,
                    205:  * setting this to 1 results in an odd hybrid.
                    206:  *
                    207:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    208:  * to translate the destination address to another local interface.
                    209:  *
                    210:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    211:  * to the loopback interface instead of the interface where the
                    212:  * packets for those addresses are received.
                    213:  */
                    214: int    ip_checkinterface = 0;
                    215:
1.1       cgd       216:
1.60      kml       217: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    218:
1.1       cgd       219: int    ipqmaxlen = IFQ_MAXLEN;
1.150     matt      220: u_long in_ifaddrhash;                          /* size of hash table - 1 */
                    221: int    in_ifaddrentries;                       /* total number of addrs */
1.212     perry     222: struct in_ifaddrhead in_ifaddrhead;
1.57      tls       223: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166     matt      224: u_long in_multihash;                           /* size of hash table - 1 */
                    225: int    in_multientries;                        /* total number of addrs */
                    226: struct in_multihashhead *in_multihashtbl;
1.13      mycroft   227: struct ifqueue ipintrq;
1.183     jonathan  228: uint16_t ip_id;
1.75      thorpej   229:
1.266     thorpej   230: percpu_t *ipstat_percpu;
                    231:
1.121     thorpej   232: #ifdef PFIL_HOOKS
                    233: struct pfil_head inet_pfil_hook;
                    234: #endif
                    235:
1.194     jonathan  236: /*
                    237:  * Cached copy of nmbclusters. If nbclusters is different,
                    238:  * recalculate IP parameters derived from nmbclusters.
                    239:  */
                    240: static int     ip_nmbclusters;                 /* copy of nmbclusters */
1.210     perry     241: static void    ip_nmbclusters_changed(void);   /* recalc limits */
1.194     jonathan  242:
1.195     thorpej   243: #define CHECK_NMBCLUSTER_PARAMS()                              \
                    244: do {                                                           \
                    245:        if (__predict_false(ip_nmbclusters != nmbclusters))     \
                    246:                ip_nmbclusters_changed();                       \
                    247: } while (/*CONSTCOND*/0)
1.194     jonathan  248:
1.190     jonathan  249: /* IP datagram reassembly queues (hashed) */
                    250: #define IPREASS_NHASH_LOG2      6
                    251: #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
                    252: #define IPREASS_HMASK           (IPREASS_NHASH - 1)
                    253: #define IPREASS_HASH(x,y) \
                    254:        (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
                    255: struct ipqhead ipq[IPREASS_NHASH];
1.75      thorpej   256: int    ipq_locked;
1.212     perry     257: static int     ip_nfragpackets;        /* packets in reass queue */
1.194     jonathan  258: static int     ip_nfrags;              /* total fragments in reass queues */
                    259:
                    260: int    ip_maxfragpackets = 200;        /* limit on packets. XXX sysctl */
                    261: int    ip_maxfrags;                    /* limit on fragments. XXX sysctl */
                    262:
                    263:
                    264: /*
                    265:  * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
                    266:  * IP reassembly queue buffer managment.
1.212     perry     267:  *
1.194     jonathan  268:  * We keep a count of total IP fragments (NB: not fragmented packets!)
                    269:  * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
                    270:  * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
                    271:  * total fragments in  reassembly queues.This AIMD policy avoids
                    272:  * repeatedly deleting single packets under heavy fragmentation load
                    273:  * (e.g., from lossy NFS peers).
                    274:  */
1.212     perry     275: static u_int   ip_reass_ttl_decr(u_int ticks);
1.210     perry     276: static void    ip_reass_drophalf(void);
1.194     jonathan  277:
1.75      thorpej   278:
1.223     perry     279: static inline int ipq_lock_try(void);
                    280: static inline void ipq_unlock(void);
1.75      thorpej   281:
1.223     perry     282: static inline int
1.211     perry     283: ipq_lock_try(void)
1.75      thorpej   284: {
                    285:        int s;
                    286:
1.132     thorpej   287:        /*
1.149     wiz       288:         * Use splvm() -- we're blocking things that would cause
1.132     thorpej   289:         * mbuf allocation.
                    290:         */
                    291:        s = splvm();
1.75      thorpej   292:        if (ipq_locked) {
                    293:                splx(s);
                    294:                return (0);
                    295:        }
                    296:        ipq_locked = 1;
                    297:        splx(s);
                    298:        return (1);
                    299: }
                    300:
1.223     perry     301: static inline void
1.211     perry     302: ipq_unlock(void)
1.75      thorpej   303: {
                    304:        int s;
                    305:
1.132     thorpej   306:        s = splvm();
1.75      thorpej   307:        ipq_locked = 0;
                    308:        splx(s);
                    309: }
                    310:
                    311: #ifdef DIAGNOSTIC
                    312: #define        IPQ_LOCK()                                                      \
                    313: do {                                                                   \
                    314:        if (ipq_lock_try() == 0) {                                      \
                    315:                printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
                    316:                panic("ipq_lock");                                      \
                    317:        }                                                               \
1.159     perry     318: } while (/*CONSTCOND*/ 0)
1.75      thorpej   319: #define        IPQ_LOCK_CHECK()                                                \
                    320: do {                                                                   \
                    321:        if (ipq_locked == 0) {                                          \
                    322:                printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
                    323:                panic("ipq lock check");                                \
                    324:        }                                                               \
1.159     perry     325: } while (/*CONSTCOND*/ 0)
1.75      thorpej   326: #else
                    327: #define        IPQ_LOCK()              (void) ipq_lock_try()
                    328: #define        IPQ_LOCK_CHECK()        /* nothing */
                    329: #endif
                    330:
                    331: #define        IPQ_UNLOCK()            ipq_unlock()
1.1       cgd       332:
1.246     ad        333: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
                    334:     IPL_SOFTNET);
                    335: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
                    336:     IPL_VM);
1.72      thorpej   337:
1.135     thorpej   338: #ifdef INET_CSUM_COUNTERS
                    339: #include <sys/device.h>
                    340:
                    341: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    342:     NULL, "inet", "hwcsum bad");
                    343: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    344:     NULL, "inet", "hwcsum ok");
                    345: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    346:     NULL, "inet", "swcsum");
                    347:
                    348: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    349:
1.201     matt      350: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    351: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    352: EVCNT_ATTACH_STATIC(ip_swcsum);
                    353:
1.135     thorpej   354: #else
                    355:
                    356: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    357:
                    358: #endif /* INET_CSUM_COUNTERS */
                    359:
1.1       cgd       360: /*
                    361:  * We need to save the IP options in case a protocol wants to respond
                    362:  * to an incoming packet over the same route if the packet got here
                    363:  * using IP source routing.  This allows connection establishment and
                    364:  * maintenance when the remote end is on a network that is not known
                    365:  * to us.
                    366:  */
                    367: int    ip_nhops = 0;
                    368: static struct ip_srcrt {
                    369:        struct  in_addr dst;                    /* final destination */
                    370:        char    nop;                            /* one NOP to align */
                    371:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    372:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    373: } ip_srcrt;
                    374:
1.210     perry     375: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   376:
1.164     matt      377: #ifdef MBUFTRACE
1.234     dogcow    378: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    379: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      380: #endif
                    381:
1.1       cgd       382: /*
1.194     jonathan  383:  * Compute IP limits derived from the value of nmbclusters.
                    384:  */
                    385: static void
                    386: ip_nmbclusters_changed(void)
                    387: {
                    388:        ip_maxfrags = nmbclusters / 4;
                    389:        ip_nmbclusters =  nmbclusters;
                    390: }
                    391:
                    392: /*
1.1       cgd       393:  * IP initialization: fill in IP protocol switch table.
                    394:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    395:  */
1.8       mycroft   396: void
1.211     perry     397: ip_init(void)
1.1       cgd       398: {
1.199     matt      399:        const struct protosw *pr;
1.109     augustss  400:        int i;
1.1       cgd       401:
                    402:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    403:        if (pr == 0)
                    404:                panic("ip_init");
                    405:        for (i = 0; i < IPPROTO_MAX; i++)
                    406:                ip_protox[i] = pr - inetsw;
                    407:        for (pr = inetdomain.dom_protosw;
                    408:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    409:                if (pr->pr_domain->dom_family == PF_INET &&
                    410:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    411:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  412:
1.190     jonathan  413:        for (i = 0; i < IPREASS_NHASH; i++)
                    414:                LIST_INIT(&ipq[i]);
                    415:
1.262     matt      416:        ip_initid();
1.227     kardel    417:        ip_id = time_second & 0xfffff;
1.194     jonathan  418:
1.1       cgd       419:        ipintrq.ifq_maxlen = ipqmaxlen;
1.194     jonathan  420:        ip_nmbclusters_changed();
                    421:
1.181     jonathan  422:        TAILQ_INIT(&in_ifaddrhead);
1.266.2.1! yamt      423:        in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
        !           424:            &in_ifaddrhash);
        !           425:        in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
        !           426:            &in_multihash);
1.160     itojun    427:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   428: #ifdef GATEWAY
1.248     liamjfoy  429:        ipflow_init(ip_hashsize);
1.73      thorpej   430: #endif
1.121     thorpej   431:
                    432: #ifdef PFIL_HOOKS
                    433:        /* Register our Packet Filter hook. */
1.126     thorpej   434:        inet_pfil_hook.ph_type = PFIL_TYPE_AF;
                    435:        inet_pfil_hook.ph_af   = AF_INET;
1.121     thorpej   436:        i = pfil_head_register(&inet_pfil_hook);
                    437:        if (i != 0)
                    438:                printf("ip_init: WARNING: unable to register pfil hook, "
                    439:                    "error %d\n", i);
                    440: #endif /* PFIL_HOOKS */
1.135     thorpej   441:
1.164     matt      442: #ifdef MBUFTRACE
                    443:        MOWNER_ATTACH(&ip_tx_mowner);
                    444:        MOWNER_ATTACH(&ip_rx_mowner);
                    445: #endif /* MBUFTRACE */
1.266     thorpej   446:
                    447:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       448: }
                    449:
1.229     christos  450: struct sockaddr_in ipaddr = {
                    451:        .sin_len = sizeof(ipaddr),
                    452:        .sin_family = AF_INET,
                    453: };
1.1       cgd       454: struct route ipforward_rt;
                    455:
                    456: /*
1.89      itojun    457:  * IP software interrupt routine
                    458:  */
                    459: void
1.211     perry     460: ipintr(void)
1.89      itojun    461: {
                    462:        int s;
                    463:        struct mbuf *m;
                    464:
1.266.2.1! yamt      465:        mutex_enter(softnet_lock);
        !           466:        KERNEL_LOCK(1, NULL);
1.241     ad        467:        while (!IF_IS_EMPTY(&ipintrq)) {
1.132     thorpej   468:                s = splnet();
1.89      itojun    469:                IF_DEQUEUE(&ipintrq, m);
                    470:                splx(s);
1.266.2.1! yamt      471:                if (m == NULL)
        !           472:                        break;
1.89      itojun    473:                ip_input(m);
                    474:        }
1.266.2.1! yamt      475:        KERNEL_UNLOCK_ONE(NULL);
        !           476:        mutex_exit(softnet_lock);
1.89      itojun    477: }
                    478:
                    479: /*
1.1       cgd       480:  * Ip input routine.  Checksum and byte swap header.  If fragmented
                    481:  * try to reassemble.  Process options.  Pass to next level.
                    482:  */
1.8       mycroft   483: void
1.89      itojun    484: ip_input(struct mbuf *m)
1.1       cgd       485: {
1.109     augustss  486:        struct ip *ip = NULL;
                    487:        struct ipq *fp;
                    488:        struct in_ifaddr *ia;
                    489:        struct ifaddr *ifa;
1.25      cgd       490:        struct ipqent *ipqe;
1.89      itojun    491:        int hlen = 0, mff, len;
1.100     itojun    492:        int downmatch;
1.165     christos  493:        int checkif;
1.169     itojun    494:        int srcrt = 0;
1.233     tls       495:        int s;
1.190     jonathan  496:        u_int hash;
1.173     jonathan  497: #ifdef FAST_IPSEC
                    498:        struct m_tag *mtag;
                    499:        struct tdb_ident *tdbi;
                    500:        struct secpolicy *sp;
1.233     tls       501:        int error;
1.173     jonathan  502: #endif /* FAST_IPSEC */
1.1       cgd       503:
1.164     matt      504:        MCLAIM(m, &ip_rx_mowner);
1.1       cgd       505: #ifdef DIAGNOSTIC
                    506:        if ((m->m_flags & M_PKTHDR) == 0)
                    507:                panic("ipintr no HDR");
1.89      itojun    508: #endif
1.164     matt      509:
1.1       cgd       510:        /*
                    511:         * If no IP addresses have been set yet but the interfaces
                    512:         * are receiving, can't do anything with incoming packets yet.
                    513:         */
1.181     jonathan  514:        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1       cgd       515:                goto bad;
1.266     thorpej   516:        IP_STATINC(IP_STAT_TOTAL);
1.154     thorpej   517:        /*
                    518:         * If the IP header is not aligned, slurp it up into a new
                    519:         * mbuf with space for link headers, in the event we forward
                    520:         * it.  Otherwise, if it is aligned, make sure the entire
                    521:         * base IP header is in the first mbuf of the chain.
                    522:         */
1.244     christos  523:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   524:                if ((m = m_copyup(m, sizeof(struct ip),
                    525:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    526:                        /* XXXJRT new stat, please */
1.266     thorpej   527:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   528:                        return;
                    529:                }
                    530:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    531:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   532:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   533:                        return;
                    534:                }
1.1       cgd       535:        }
                    536:        ip = mtod(m, struct ip *);
1.13      mycroft   537:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   538:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   539:                goto bad;
                    540:        }
1.1       cgd       541:        hlen = ip->ip_hl << 2;
                    542:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   543:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       544:                goto bad;
                    545:        }
                    546:        if (hlen > m->m_len) {
                    547:                if ((m = m_pullup(m, hlen)) == 0) {
1.266     thorpej   548:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    549:                        return;
1.1       cgd       550:                }
                    551:                ip = mtod(m, struct ip *);
                    552:        }
1.98      thorpej   553:
1.85      hwr       554:        /*
1.99      thorpej   555:         * RFC1122: packets with a multicast source address are
1.98      thorpej   556:         * not allowed.
1.85      hwr       557:         */
                    558:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   559:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       560:                goto bad;
1.129     itojun    561:        }
                    562:
                    563:        /* 127/8 must not appear on wire - RFC1122 */
                    564:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    565:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130     itojun    566:                if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   567:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    568:                        goto bad;
1.130     itojun    569:                }
1.85      hwr       570:        }
                    571:
1.135     thorpej   572:        switch (m->m_pkthdr.csum_flags &
1.137     thorpej   573:                ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   574:                 M_CSUM_IPv4_BAD)) {
                    575:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    576:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    577:                goto badcsum;
                    578:
                    579:        case M_CSUM_IPv4:
                    580:                /* Checksum was okay. */
                    581:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    582:                break;
                    583:
                    584:        default:
1.206     thorpej   585:                /*
                    586:                 * Must compute it ourselves.  Maybe skip checksum on
                    587:                 * loopback interfaces.
                    588:                 */
                    589:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    590:                                     IFF_LOOPBACK) || ip_do_loopback_cksum)) {
                    591:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    592:                        if (in_cksum(m, hlen) != 0)
                    593:                                goto badcsum;
                    594:                }
1.135     thorpej   595:                break;
1.1       cgd       596:        }
                    597:
1.121     thorpej   598:        /* Retrieve the packet length. */
                    599:        len = ntohs(ip->ip_len);
1.81      proff     600:
                    601:        /*
                    602:         * Check for additional length bogosity
                    603:         */
1.84      proff     604:        if (len < hlen) {
1.266     thorpej   605:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     606:                goto bad;
                    607:        }
1.1       cgd       608:
                    609:        /*
                    610:         * Check that the amount of data in the buffers
                    611:         * is as at least much as the IP header would have us expect.
                    612:         * Trim mbufs if longer than we expect.
                    613:         * Drop packet if shorter than we expect.
                    614:         */
1.35      mycroft   615:        if (m->m_pkthdr.len < len) {
1.266     thorpej   616:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       617:                goto bad;
                    618:        }
1.35      mycroft   619:        if (m->m_pkthdr.len > len) {
1.1       cgd       620:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   621:                        m->m_len = len;
                    622:                        m->m_pkthdr.len = len;
1.1       cgd       623:                } else
1.35      mycroft   624:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       625:        }
                    626:
1.193     scw       627: #if defined(IPSEC)
1.149     wiz       628:        /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94      itojun    629:        m->m_flags &= ~M_CANFASTFWD;
                    630: #else
1.64      thorpej   631:        /*
                    632:         * Assume that we can create a fast-forward IP flow entry
                    633:         * based on this packet.
                    634:         */
                    635:        m->m_flags |= M_CANFASTFWD;
1.94      itojun    636: #endif
1.64      thorpej   637:
1.36      mrg       638: #ifdef PFIL_HOOKS
1.33      mrg       639:        /*
1.64      thorpej   640:         * Run through list of hooks for input packets.  If there are any
                    641:         * filters which require that additional packets in the flow are
                    642:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    643:         * Note that filters must _never_ set this flag, as another filter
                    644:         * in the list may have previously cleared it.
1.33      mrg       645:         */
1.127     itojun    646:        /*
                    647:         * let ipfilter look at packet on the wire,
                    648:         * not the decapsulated packet.
                    649:         */
                    650: #ifdef IPSEC
1.136     itojun    651:        if (!ipsec_getnhist(m))
1.186     scw       652: #elif defined(FAST_IPSEC)
                    653:        if (!ipsec_indone(m))
1.127     itojun    654: #else
                    655:        if (1)
                    656: #endif
                    657:        {
1.169     itojun    658:                struct in_addr odst;
                    659:
                    660:                odst = ip->ip_dst;
1.127     itojun    661:                if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168     itojun    662:                    PFIL_IN) != 0)
                    663:                        return;
1.127     itojun    664:                if (m == NULL)
                    665:                        return;
                    666:                ip = mtod(m, struct ip *);
1.142     darrenr   667:                hlen = ip->ip_hl << 2;
1.205     darrenr   668:                /*
                    669:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    670:                 * from generating ICMP redirects for packets that have
                    671:                 * been redirected by a hook back out on to the same LAN that
                    672:                 * they came from and is not an indication that the packet
                    673:                 * is being inffluenced by source routing options.  This
                    674:                 * allows things like
                    675:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    676:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    677:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    678:                 * also requires a "map tlp0 ..." to complete the story.
                    679:                 * One might argue whether or not this kind of network config.
1.212     perry     680:                 * should be supported in this manner...
1.205     darrenr   681:                 */
1.169     itojun    682:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    683:        }
1.36      mrg       684: #endif /* PFIL_HOOKS */
1.123     thorpej   685:
                    686: #ifdef ALTQ
                    687:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    688:        if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
                    689:                /* packet dropped by traffic conditioner */
                    690:                return;
                    691:        }
                    692: #endif
1.121     thorpej   693:
                    694:        /*
1.1       cgd       695:         * Process options and, if not destined for us,
                    696:         * ship it on.  ip_dooptions returns 1 when an
                    697:         * error was detected (causing an icmp message
                    698:         * to be sent and the original packet to be freed).
                    699:         */
                    700:        ip_nhops = 0;           /* for source routed packets */
                    701:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    702:                return;
1.1       cgd       703:
                    704:        /*
1.165     christos  705:         * Enable a consistency check between the destination address
                    706:         * and the arrival interface for a unicast packet (the RFC 1122
                    707:         * strong ES model) if IP forwarding is disabled and the packet
                    708:         * is not locally generated.
                    709:         *
                    710:         * XXX - Checking also should be disabled if the destination
                    711:         * address is ipnat'ed to a different interface.
                    712:         *
                    713:         * XXX - Checking is incompatible with IP aliases added
                    714:         * to the loopback interface instead of the interface where
                    715:         * the packets are received.
                    716:         *
                    717:         * XXX - We need to add a per ifaddr flag for this so that
                    718:         * we get finer grain control.
                    719:         */
                    720:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    721:            (m->m_pkthdr.rcvif != NULL) &&
                    722:            ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
                    723:
                    724:        /*
1.1       cgd       725:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    726:         *
                    727:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    728:         * The behavior here is to treat addresses on !IFF_UP interface
                    729:         * as not mine.
1.1       cgd       730:         */
1.100     itojun    731:        downmatch = 0;
1.140     matt      732:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    733:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165     christos  734:                        if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
                    735:                                continue;
1.97      itojun    736:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    737:                                break;
1.100     itojun    738:                        else
                    739:                                downmatch++;
1.97      itojun    740:                }
                    741:        }
1.86      thorpej   742:        if (ia != NULL)
                    743:                goto ours;
1.225     christos  744:        if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209     matt      745:                IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140     matt      746:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    747:                                continue;
1.57      tls       748:                        ia = ifatoia(ifa);
1.35      mycroft   749:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    750:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   751:                            /*
                    752:                             * Look for all-0's host part (old broadcast addr),
                    753:                             * either for subnet or net.
                    754:                             */
                    755:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   756:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       757:                                goto ours;
1.57      tls       758:                        /*
                    759:                         * An interface with IP address zero accepts
                    760:                         * all packets that arrive on that interface.
                    761:                         */
                    762:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    763:                                goto ours;
1.1       cgd       764:                }
                    765:        }
1.18      mycroft   766:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   767:                struct in_multi *inm;
                    768: #ifdef MROUTING
                    769:                extern struct socket *ip_mrouter;
1.10      brezak    770:
1.4       hpeyerl   771:                if (ip_mrouter) {
                    772:                        /*
                    773:                         * If we are acting as a multicast router, all
                    774:                         * incoming multicast packets are passed to the
                    775:                         * kernel-level multicast forwarding function.
                    776:                         * The packet is returned (relatively) intact; if
                    777:                         * ip_mforward() returns a non-zero value, the packet
                    778:                         * must be discarded, else it may be accepted below.
                    779:                         *
                    780:                         * (The IP ident field is put in the same byte order
                    781:                         * as expected when ip_mforward() is called from
                    782:                         * ip_output().)
                    783:                         */
1.13      mycroft   784:                        if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266     thorpej   785:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   786:                                m_freem(m);
1.89      itojun    787:                                return;
1.4       hpeyerl   788:                        }
                    789:
                    790:                        /*
                    791:                         * The process-level routing demon needs to receive
                    792:                         * all multicast IGMP packets, whether or not this
                    793:                         * host belongs to their destination groups.
                    794:                         */
                    795:                        if (ip->ip_p == IPPROTO_IGMP)
                    796:                                goto ours;
1.266     thorpej   797:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   798:                }
                    799: #endif
                    800:                /*
                    801:                 * See if we belong to the destination multicast group on the
                    802:                 * arrival interface.
                    803:                 */
                    804:                IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
                    805:                if (inm == NULL) {
1.266     thorpej   806:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   807:                        m_freem(m);
1.89      itojun    808:                        return;
1.4       hpeyerl   809:                }
                    810:                goto ours;
                    811:        }
1.19      mycroft   812:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   813:            in_nullhost(ip->ip_dst))
1.1       cgd       814:                goto ours;
                    815:
                    816:        /*
                    817:         * Not for us; forward if possible and desirable.
                    818:         */
                    819:        if (ipforwarding == 0) {
1.266     thorpej   820:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       821:                m_freem(m);
1.100     itojun    822:        } else {
                    823:                /*
                    824:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    825:                 * and there's no IFF_UP interface that matches ip_dst,
                    826:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    827:                 * forwarding loop till TTL goes to 0.
                    828:                 */
                    829:                if (downmatch) {
                    830:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   831:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    832:                        return;
                    833:                }
1.145     itojun    834: #ifdef IPSEC
                    835:                if (ipsec4_in_reject(m, NULL)) {
1.266.2.1! yamt      836:                        IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145     itojun    837:                        goto bad;
                    838:                }
                    839: #endif
1.173     jonathan  840: #ifdef FAST_IPSEC
                    841:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    842:                s = splsoftnet();
                    843:                if (mtag != NULL) {
                    844:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    845:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    846:                } else {
                    847:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry     848:                                                   IP_FORWARDING, &error);
1.173     jonathan  849:                }
                    850:                if (sp == NULL) {       /* NB: can happen if error */
                    851:                        splx(s);
                    852:                        /*XXX error stat???*/
                    853:                        DPRINTF(("ip_input: no SP for forwarding\n"));  /*XXX*/
                    854:                        goto bad;
                    855:                }
                    856:
                    857:                /*
                    858:                 * Check security policy against packet attributes.
                    859:                 */
                    860:                error = ipsec_in_reject(sp, m);
                    861:                KEY_FREESP(&sp);
                    862:                splx(s);
                    863:                if (error) {
1.266     thorpej   864:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.173     jonathan  865:                        goto bad;
1.193     scw       866:                }
                    867:
                    868:                /*
                    869:                 * Peek at the outbound SP for this packet to determine if
                    870:                 * it's a Fast Forward candidate.
                    871:                 */
                    872:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
                    873:                if (mtag != NULL)
                    874:                        m->m_flags &= ~M_CANFASTFWD;
                    875:                else {
                    876:                        s = splsoftnet();
                    877:                        sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
                    878:                            (IP_FORWARDING |
                    879:                             (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
                    880:                            &error, NULL);
                    881:                        if (sp != NULL) {
                    882:                                m->m_flags &= ~M_CANFASTFWD;
                    883:                                KEY_FREESP(&sp);
                    884:                        }
                    885:                        splx(s);
1.173     jonathan  886:                }
                    887: #endif /* FAST_IPSEC */
1.145     itojun    888:
1.169     itojun    889:                ip_forward(m, srcrt);
1.100     itojun    890:        }
1.89      itojun    891:        return;
1.1       cgd       892:
                    893: ours:
                    894:        /*
                    895:         * If offset or IP_MF are set, must reassemble.
                    896:         * Otherwise, nothing need be done.
                    897:         * (We could look in the reassembly queue to see
                    898:         * if the packet was previously fragmented,
                    899:         * but it's not worth the time; just let them time out.)
                    900:         */
1.155     itojun    901:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258     matt      902:                uint16_t off;
                    903:                /*
                    904:                 * Prevent TCP blind data attacks by not allowing non-initial
                    905:                 * fragments to start at less than 68 bytes (minimal fragment
1.259     matt      906:                 * size) and making sure the first fragment is at least 68
                    907:                 * bytes.
1.258     matt      908:                 */
1.260     matt      909:                off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259     matt      910:                if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266     thorpej   911:                        IP_STATINC(IP_STAT_BADFRAGS);
1.258     matt      912:                        goto bad;
                    913:                }
1.1       cgd       914:                /*
                    915:                 * Look for queue of fragments
                    916:                 * of this datagram.
                    917:                 */
1.75      thorpej   918:                IPQ_LOCK();
1.190     jonathan  919:                hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250     dyoung    920:                LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1       cgd       921:                        if (ip->ip_id == fp->ipq_id &&
1.35      mycroft   922:                            in_hosteq(ip->ip_src, fp->ipq_src) &&
                    923:                            in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260     matt      924:                            ip->ip_p == fp->ipq_p) {
                    925:                                /*
                    926:                                 * Make sure the TOS is matches previous
                    927:                                 * fragments.
                    928:                                 */
                    929:                                if (ip->ip_tos != fp->ipq_tos) {
1.266     thorpej   930:                                        IP_STATINC(IP_STAT_BADFRAGS);
1.260     matt      931:                                        goto bad;
                    932:                                }
1.1       cgd       933:                                goto found;
1.260     matt      934:                        }
1.190     jonathan  935:                }
1.1       cgd       936:                fp = 0;
                    937: found:
                    938:
                    939:                /*
                    940:                 * Adjust ip_len to not reflect header,
1.25      cgd       941:                 * set ipqe_mff if more fragments are expected,
1.1       cgd       942:                 * convert offset of this to bytes.
                    943:                 */
1.155     itojun    944:                ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
                    945:                mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25      cgd       946:                if (mff) {
1.16      cgd       947:                        /*
                    948:                         * Make sure that fragments have a data length
                    949:                         * that's a non-zero multiple of 8 bytes.
                    950:                         */
1.155     itojun    951:                        if (ntohs(ip->ip_len) == 0 ||
                    952:                            (ntohs(ip->ip_len) & 0x7) != 0) {
1.266     thorpej   953:                                IP_STATINC(IP_STAT_BADFRAGS);
1.75      thorpej   954:                                IPQ_UNLOCK();
1.16      cgd       955:                                goto bad;
                    956:                        }
                    957:                }
1.155     itojun    958:                ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1       cgd       959:
                    960:                /*
                    961:                 * If datagram marked as having more fragments
                    962:                 * or if this is not the first fragment,
                    963:                 * attempt reassembly; if it succeeds, proceed.
                    964:                 */
1.155     itojun    965:                if (mff || ip->ip_off != htons(0)) {
1.266     thorpej   966:                        IP_STATINC(IP_STAT_FRAGMENTS);
1.233     tls       967:                        s = splvm();
1.72      thorpej   968:                        ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233     tls       969:                        splx(s);
1.25      cgd       970:                        if (ipqe == NULL) {
1.266     thorpej   971:                                IP_STATINC(IP_STAT_RCVMEMDROP);
1.75      thorpej   972:                                IPQ_UNLOCK();
1.25      cgd       973:                                goto bad;
                    974:                        }
                    975:                        ipqe->ipqe_mff = mff;
1.50      thorpej   976:                        ipqe->ipqe_m = m;
1.25      cgd       977:                        ipqe->ipqe_ip = ip;
1.190     jonathan  978:                        m = ip_reass(ipqe, fp, &ipq[hash]);
1.75      thorpej   979:                        if (m == 0) {
                    980:                                IPQ_UNLOCK();
1.89      itojun    981:                                return;
1.75      thorpej   982:                        }
1.266     thorpej   983:                        IP_STATINC(IP_STAT_REASSEMBLED);
1.50      thorpej   984:                        ip = mtod(m, struct ip *);
1.74      thorpej   985:                        hlen = ip->ip_hl << 2;
1.155     itojun    986:                        ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1       cgd       987:                } else
                    988:                        if (fp)
                    989:                                ip_freef(fp);
1.75      thorpej   990:                IPQ_UNLOCK();
1.79      mycroft   991:        }
1.128     itojun    992:
1.173     jonathan  993: #if defined(IPSEC)
1.128     itojun    994:        /*
                    995:         * enforce IPsec policy checking if we are seeing last header.
                    996:         * note that we do not visit this with protocols with pcb layer
                    997:         * code - like udp/tcp/raw ip.
                    998:         */
                    999:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
                   1000:            ipsec4_in_reject(m, NULL)) {
1.266.2.1! yamt     1001:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128     itojun   1002:                goto bad;
                   1003:        }
                   1004: #endif
1.226     liamjfoy 1005: #ifdef FAST_IPSEC
1.173     jonathan 1006:        /*
                   1007:         * enforce IPsec policy checking if we are seeing last header.
                   1008:         * note that we do not visit this with protocols with pcb layer
                   1009:         * code - like udp/tcp/raw ip.
                   1010:         */
                   1011:        if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
                   1012:                /*
                   1013:                 * Check if the packet has already had IPsec processing
                   1014:                 * done.  If so, then just pass it along.  This tag gets
                   1015:                 * set during AH, ESP, etc. input handling, before the
                   1016:                 * packet is returned to the ip input queue for delivery.
1.212     perry    1017:                 */
1.173     jonathan 1018:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                   1019:                s = splsoftnet();
                   1020:                if (mtag != NULL) {
                   1021:                        tdbi = (struct tdb_ident *)(mtag + 1);
                   1022:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                   1023:                } else {
                   1024:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212     perry    1025:                                                   IP_FORWARDING, &error);
1.173     jonathan 1026:                }
                   1027:                if (sp != NULL) {
                   1028:                        /*
                   1029:                         * Check security policy against packet attributes.
                   1030:                         */
                   1031:                        error = ipsec_in_reject(sp, m);
                   1032:                        KEY_FREESP(&sp);
                   1033:                } else {
                   1034:                        /* XXX error stat??? */
                   1035:                        error = EINVAL;
                   1036: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
                   1037:                }
                   1038:                splx(s);
                   1039:                if (error)
                   1040:                        goto bad;
                   1041:        }
                   1042: #endif /* FAST_IPSEC */
1.1       cgd      1043:
                   1044:        /*
                   1045:         * Switch out to protocol's input routine.
                   1046:         */
1.82      aidan    1047: #if IFA_STATS
1.122     itojun   1048:        if (ia && ip)
1.155     itojun   1049:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan    1050: #endif
1.266     thorpej  1051:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun   1052:     {
                   1053:        int off = hlen, nh = ip->ip_p;
                   1054:
                   1055:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
                   1056:        return;
                   1057:     }
1.1       cgd      1058: bad:
                   1059:        m_freem(m);
1.135     thorpej  1060:        return;
                   1061:
                   1062: badcsum:
1.266     thorpej  1063:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej  1064:        m_freem(m);
1.1       cgd      1065: }
                   1066:
                   1067: /*
                   1068:  * Take incoming datagram fragment and try to
                   1069:  * reassemble it into whole datagram.  If a chain for
                   1070:  * reassembly of this datagram already exists, then it
                   1071:  * is given as fp; otherwise have to make a chain.
                   1072:  */
1.50      thorpej  1073: struct mbuf *
1.211     perry    1074: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1       cgd      1075: {
1.109     augustss 1076:        struct mbuf *m = ipqe->ipqe_m;
                   1077:        struct ipqent *nq, *p, *q;
1.25      cgd      1078:        struct ip *ip;
1.1       cgd      1079:        struct mbuf *t;
1.25      cgd      1080:        int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233     tls      1081:        int i, next, s;
1.1       cgd      1082:
1.75      thorpej  1083:        IPQ_LOCK_CHECK();
                   1084:
1.1       cgd      1085:        /*
                   1086:         * Presence of header sizes in mbufs
                   1087:         * would confuse code below.
                   1088:         */
                   1089:        m->m_data += hlen;
                   1090:        m->m_len -= hlen;
                   1091:
1.194     jonathan 1092: #ifdef notyet
                   1093:        /* make sure fragment limit is up-to-date */
                   1094:        CHECK_NMBCLUSTER_PARAMS();
                   1095:
                   1096:        /* If we have too many fragments, drop the older half. */
                   1097:        if (ip_nfrags >= ip_maxfrags)
                   1098:                ip_reass_drophalf(void);
                   1099: #endif
                   1100:
1.1       cgd      1101:        /*
1.192     jonathan 1102:         * We are about to add a fragment; increment frag count.
                   1103:         */
                   1104:        ip_nfrags++;
1.212     perry    1105:
1.192     jonathan 1106:        /*
1.1       cgd      1107:         * If first fragment to arrive, create a reassembly queue.
                   1108:         */
                   1109:        if (fp == 0) {
1.131     itojun   1110:                /*
                   1111:                 * Enforce upper bound on number of fragmented packets
                   1112:                 * for which we attempt reassembly;
                   1113:                 * If maxfrag is 0, never accept fragments.
                   1114:                 * If maxfrag is -1, accept all fragments without limitation.
                   1115:                 */
                   1116:                if (ip_maxfragpackets < 0)
                   1117:                        ;
                   1118:                else if (ip_nfragpackets >= ip_maxfragpackets)
                   1119:                        goto dropfrag;
                   1120:                ip_nfragpackets++;
1.50      thorpej  1121:                MALLOC(fp, struct ipq *, sizeof (struct ipq),
                   1122:                    M_FTABLE, M_NOWAIT);
                   1123:                if (fp == NULL)
1.1       cgd      1124:                        goto dropfrag;
1.190     jonathan 1125:                LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192     jonathan 1126:                fp->ipq_nfrags = 1;
1.1       cgd      1127:                fp->ipq_ttl = IPFRAGTTL;
1.25      cgd      1128:                fp->ipq_p = ipqe->ipqe_ip->ip_p;
                   1129:                fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260     matt     1130:                fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148     matt     1131:                TAILQ_INIT(&fp->ipq_fragq);
1.25      cgd      1132:                fp->ipq_src = ipqe->ipqe_ip->ip_src;
                   1133:                fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
                   1134:                p = NULL;
1.1       cgd      1135:                goto insert;
1.192     jonathan 1136:        } else {
                   1137:                fp->ipq_nfrags++;
1.1       cgd      1138:        }
                   1139:
                   1140:        /*
                   1141:         * Find a segment which begins after this one does.
                   1142:         */
1.148     matt     1143:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1144:            p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155     itojun   1145:                if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1       cgd      1146:                        break;
                   1147:
                   1148:        /*
                   1149:         * If there is a preceding segment, it may provide some of
                   1150:         * our data already.  If so, drop the data from the incoming
                   1151:         * segment.  If it provides all of our data, drop us.
                   1152:         */
1.25      cgd      1153:        if (p != NULL) {
1.155     itojun   1154:                i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
                   1155:                    ntohs(ipqe->ipqe_ip->ip_off);
1.1       cgd      1156:                if (i > 0) {
1.155     itojun   1157:                        if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1       cgd      1158:                                goto dropfrag;
1.50      thorpej  1159:                        m_adj(ipqe->ipqe_m, i);
1.155     itojun   1160:                        ipqe->ipqe_ip->ip_off =
                   1161:                            htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
                   1162:                        ipqe->ipqe_ip->ip_len =
                   1163:                            htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1       cgd      1164:                }
                   1165:        }
                   1166:
                   1167:        /*
                   1168:         * While we overlap succeeding segments trim them or,
                   1169:         * if they are completely covered, dequeue them.
                   1170:         */
1.155     itojun   1171:        for (; q != NULL &&
                   1172:            ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
                   1173:            ntohs(q->ipqe_ip->ip_off); q = nq) {
                   1174:                i = (ntohs(ipqe->ipqe_ip->ip_off) +
                   1175:                    ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
                   1176:                if (i < ntohs(q->ipqe_ip->ip_len)) {
                   1177:                        q->ipqe_ip->ip_len =
                   1178:                            htons(ntohs(q->ipqe_ip->ip_len) - i);
                   1179:                        q->ipqe_ip->ip_off =
                   1180:                            htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50      thorpej  1181:                        m_adj(q->ipqe_m, i);
1.1       cgd      1182:                        break;
                   1183:                }
1.148     matt     1184:                nq = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1185:                m_freem(q->ipqe_m);
1.148     matt     1186:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1187:                s = splvm();
1.72      thorpej  1188:                pool_put(&ipqent_pool, q);
1.233     tls      1189:                splx(s);
1.192     jonathan 1190:                fp->ipq_nfrags--;
                   1191:                ip_nfrags--;
1.1       cgd      1192:        }
                   1193:
                   1194: insert:
                   1195:        /*
                   1196:         * Stick new segment in its place;
                   1197:         * check for complete reassembly.
                   1198:         */
1.25      cgd      1199:        if (p == NULL) {
1.148     matt     1200:                TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25      cgd      1201:        } else {
1.148     matt     1202:                TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25      cgd      1203:        }
1.1       cgd      1204:        next = 0;
1.148     matt     1205:        for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
                   1206:            p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155     itojun   1207:                if (ntohs(q->ipqe_ip->ip_off) != next)
1.1       cgd      1208:                        return (0);
1.155     itojun   1209:                next += ntohs(q->ipqe_ip->ip_len);
1.1       cgd      1210:        }
1.25      cgd      1211:        if (p->ipqe_mff)
1.1       cgd      1212:                return (0);
                   1213:
                   1214:        /*
1.41      thorpej  1215:         * Reassembly is complete.  Check for a bogus message size and
                   1216:         * concatenate fragments.
1.1       cgd      1217:         */
1.148     matt     1218:        q = TAILQ_FIRST(&fp->ipq_fragq);
1.25      cgd      1219:        ip = q->ipqe_ip;
1.41      thorpej  1220:        if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266     thorpej  1221:                IP_STATINC(IP_STAT_TOOLONG);
1.41      thorpej  1222:                ip_freef(fp);
                   1223:                return (0);
                   1224:        }
1.50      thorpej  1225:        m = q->ipqe_m;
1.1       cgd      1226:        t = m->m_next;
                   1227:        m->m_next = 0;
                   1228:        m_cat(m, t);
1.148     matt     1229:        nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1230:        s = splvm();
1.72      thorpej  1231:        pool_put(&ipqent_pool, q);
1.233     tls      1232:        splx(s);
1.25      cgd      1233:        for (q = nq; q != NULL; q = nq) {
1.50      thorpej  1234:                t = q->ipqe_m;
1.148     matt     1235:                nq = TAILQ_NEXT(q, ipqe_q);
1.233     tls      1236:                s = splvm();
1.72      thorpej  1237:                pool_put(&ipqent_pool, q);
1.233     tls      1238:                splx(s);
1.1       cgd      1239:                m_cat(m, t);
                   1240:        }
1.192     jonathan 1241:        ip_nfrags -= fp->ipq_nfrags;
1.1       cgd      1242:
                   1243:        /*
                   1244:         * Create header for new ip packet by
                   1245:         * modifying header of first packet;
                   1246:         * dequeue and discard fragment reassembly header.
                   1247:         * Make header visible.
                   1248:         */
1.155     itojun   1249:        ip->ip_len = htons(next);
1.25      cgd      1250:        ip->ip_src = fp->ipq_src;
                   1251:        ip->ip_dst = fp->ipq_dst;
                   1252:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1253:        FREE(fp, M_FTABLE);
1.131     itojun   1254:        ip_nfragpackets--;
1.1       cgd      1255:        m->m_len += (ip->ip_hl << 2);
                   1256:        m->m_data -= (ip->ip_hl << 2);
                   1257:        /* some debugging cruft by sklower, below, will go away soon */
                   1258:        if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109     augustss 1259:                int plen = 0;
1.50      thorpej  1260:                for (t = m; t; t = t->m_next)
                   1261:                        plen += t->m_len;
                   1262:                m->m_pkthdr.len = plen;
1.213     yamt     1263:                m->m_pkthdr.csum_flags = 0;
1.1       cgd      1264:        }
1.50      thorpej  1265:        return (m);
1.1       cgd      1266:
                   1267: dropfrag:
1.192     jonathan 1268:        if (fp != 0)
                   1269:                fp->ipq_nfrags--;
                   1270:        ip_nfrags--;
1.266     thorpej  1271:        IP_STATINC(IP_STAT_FRAGDROPPED);
1.1       cgd      1272:        m_freem(m);
1.233     tls      1273:        s = splvm();
1.72      thorpej  1274:        pool_put(&ipqent_pool, ipqe);
1.233     tls      1275:        splx(s);
1.1       cgd      1276:        return (0);
                   1277: }
                   1278:
                   1279: /*
                   1280:  * Free a fragment reassembly header and all
                   1281:  * associated datagrams.
                   1282:  */
1.8       mycroft  1283: void
1.211     perry    1284: ip_freef(struct ipq *fp)
1.1       cgd      1285: {
1.109     augustss 1286:        struct ipqent *q, *p;
1.192     jonathan 1287:        u_int nfrags = 0;
1.233     tls      1288:        int s;
1.1       cgd      1289:
1.75      thorpej  1290:        IPQ_LOCK_CHECK();
                   1291:
1.148     matt     1292:        for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
                   1293:                p = TAILQ_NEXT(q, ipqe_q);
1.50      thorpej  1294:                m_freem(q->ipqe_m);
1.192     jonathan 1295:                nfrags++;
1.148     matt     1296:                TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233     tls      1297:                s = splvm();
1.72      thorpej  1298:                pool_put(&ipqent_pool, q);
1.233     tls      1299:                splx(s);
1.1       cgd      1300:        }
1.192     jonathan 1301:
                   1302:        if (nfrags != fp->ipq_nfrags)
                   1303:            printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
                   1304:        ip_nfrags -= nfrags;
1.25      cgd      1305:        LIST_REMOVE(fp, ipq_q);
1.50      thorpej  1306:        FREE(fp, M_FTABLE);
1.131     itojun   1307:        ip_nfragpackets--;
1.1       cgd      1308: }
                   1309:
                   1310: /*
1.194     jonathan 1311:  * IP reassembly TTL machinery for  multiplicative drop.
                   1312:  */
                   1313: static u_int   fragttl_histo[(IPFRAGTTL+1)];
                   1314:
                   1315:
                   1316: /*
                   1317:  * Decrement TTL of all reasembly queue entries by `ticks'.
                   1318:  * Count number of distinct fragments (as opposed to partial, fragmented
                   1319:  * datagrams) in the reassembly queue.  While we  traverse the entire
                   1320:  * reassembly queue, compute and return the median TTL over all fragments.
                   1321:  */
                   1322: static u_int
                   1323: ip_reass_ttl_decr(u_int ticks)
                   1324: {
1.198     matt     1325:        u_int nfrags, median, dropfraction, keepfraction;
1.194     jonathan 1326:        struct ipq *fp, *nfp;
1.198     matt     1327:        int i;
1.212     perry    1328:
1.194     jonathan 1329:        nfrags = 0;
                   1330:        memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212     perry    1331:
1.194     jonathan 1332:        for (i = 0; i < IPREASS_NHASH; i++) {
                   1333:                for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
                   1334:                        fp->ipq_ttl = ((fp->ipq_ttl  <= ticks) ?
                   1335:                                       0 : fp->ipq_ttl - ticks);
                   1336:                        nfp = LIST_NEXT(fp, ipq_q);
                   1337:                        if (fp->ipq_ttl == 0) {
1.266     thorpej  1338:                                IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194     jonathan 1339:                                ip_freef(fp);
                   1340:                        } else {
                   1341:                                nfrags += fp->ipq_nfrags;
                   1342:                                fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
                   1343:                        }
                   1344:                }
                   1345:        }
                   1346:
                   1347:        KASSERT(ip_nfrags == nfrags);
                   1348:
                   1349:        /* Find median (or other drop fraction) in histogram. */
                   1350:        dropfraction = (ip_nfrags / 2);
                   1351:        keepfraction = ip_nfrags - dropfraction;
                   1352:        for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
                   1353:                median +=  fragttl_histo[i];
                   1354:                if (median >= keepfraction)
                   1355:                        break;
                   1356:        }
                   1357:
                   1358:        /* Return TTL of median (or other fraction). */
                   1359:        return (u_int)i;
                   1360: }
                   1361:
                   1362: void
                   1363: ip_reass_drophalf(void)
                   1364: {
                   1365:
                   1366:        u_int median_ticks;
                   1367:        /*
                   1368:         * Compute median TTL of all fragments, and count frags
                   1369:         * with that TTL or lower (roughly half of all fragments).
                   1370:         */
                   1371:        median_ticks = ip_reass_ttl_decr(0);
                   1372:
                   1373:        /* Drop half. */
                   1374:        median_ticks = ip_reass_ttl_decr(median_ticks);
                   1375:
                   1376: }
                   1377:
                   1378: /*
1.1       cgd      1379:  * IP timer processing;
                   1380:  * if a timer expires on a reassembly
                   1381:  * queue, discard it.
                   1382:  */
1.8       mycroft  1383: void
1.211     perry    1384: ip_slowtimo(void)
1.1       cgd      1385: {
1.191     jonathan 1386:        static u_int dropscanidx = 0;
                   1387:        u_int i;
1.194     jonathan 1388:        u_int median_ttl;
1.266.2.1! yamt     1389:
        !          1390:        mutex_enter(softnet_lock);
        !          1391:        KERNEL_LOCK(1, NULL);
1.1       cgd      1392:
1.75      thorpej  1393:        IPQ_LOCK();
1.194     jonathan 1394:
                   1395:        /* Age TTL of all fragments by 1 tick .*/
                   1396:        median_ttl = ip_reass_ttl_decr(1);
                   1397:
                   1398:        /* make sure fragment limit is up-to-date */
                   1399:        CHECK_NMBCLUSTER_PARAMS();
                   1400:
                   1401:        /* If we have too many fragments, drop the older half. */
                   1402:        if (ip_nfrags > ip_maxfrags)
                   1403:                ip_reass_ttl_decr(median_ttl);
                   1404:
1.131     itojun   1405:        /*
1.194     jonathan 1406:         * If we are over the maximum number of fragmented packets
1.131     itojun   1407:         * (due to the limit being lowered), drain off
1.190     jonathan 1408:         * enough to get down to the new limit. Start draining
                   1409:         * from the reassembly hashqueue most recently drained.
1.131     itojun   1410:         */
                   1411:        if (ip_maxfragpackets < 0)
                   1412:                ;
                   1413:        else {
1.190     jonathan 1414:                int wrapped = 0;
                   1415:
                   1416:                i = dropscanidx;
                   1417:                while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
                   1418:                        while (LIST_FIRST(&ipq[i]) != NULL)
                   1419:                                ip_freef(LIST_FIRST(&ipq[i]));
                   1420:                        if (++i >= IPREASS_NHASH) {
                   1421:                                i = 0;
                   1422:                        }
                   1423:                        /*
                   1424:                         * Dont scan forever even if fragment counters are
                   1425:                         * wrong: stop after scanning entire reassembly queue.
                   1426:                         */
                   1427:                        if (i == dropscanidx)
                   1428:                            wrapped = 1;
                   1429:                }
                   1430:                dropscanidx = i;
1.131     itojun   1431:        }
1.75      thorpej  1432:        IPQ_UNLOCK();
1.266.2.1! yamt     1433:
        !          1434:        KERNEL_UNLOCK_ONE(NULL);
        !          1435:        mutex_exit(softnet_lock);
1.1       cgd      1436: }
                   1437:
                   1438: /*
1.266.2.1! yamt     1439:  * Drain off all datagram fragments.  Don't acquire softnet_lock as
        !          1440:  * can be called from hardware interrupt context.
1.1       cgd      1441:  */
1.8       mycroft  1442: void
1.211     perry    1443: ip_drain(void)
1.1       cgd      1444: {
                   1445:
1.266.2.1! yamt     1446:        KERNEL_LOCK(1, NULL);
        !          1447:
1.75      thorpej  1448:        /*
                   1449:         * We may be called from a device's interrupt context.  If
                   1450:         * the ipq is already busy, just bail out now.
                   1451:         */
1.266.2.1! yamt     1452:        if (ipq_lock_try() != 0) {
        !          1453:                /*
        !          1454:                 * Drop half the total fragments now. If more mbufs are
        !          1455:                 * needed, we will be called again soon.
        !          1456:                 */
        !          1457:                ip_reass_drophalf();
        !          1458:                IPQ_UNLOCK();
        !          1459:        }
1.75      thorpej  1460:
1.266.2.1! yamt     1461:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd      1462: }
                   1463:
                   1464: /*
                   1465:  * Do option processing on a datagram,
                   1466:  * possibly discarding it if bad options are encountered,
                   1467:  * or forwarding it if source-routed.
                   1468:  * Returns 1 if packet has been forwarded/freed,
                   1469:  * 0 if the packet should be processed further.
                   1470:  */
1.8       mycroft  1471: int
1.211     perry    1472: ip_dooptions(struct mbuf *m)
1.1       cgd      1473: {
1.109     augustss 1474:        struct ip *ip = mtod(m, struct ip *);
                   1475:        u_char *cp, *cp0;
                   1476:        struct ip_timestamp *ipt;
                   1477:        struct in_ifaddr *ia;
1.1       cgd      1478:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej  1479:        struct in_addr dst;
1.1       cgd      1480:        n_time ntime;
                   1481:
1.13      mycroft  1482:        dst = ip->ip_dst;
1.1       cgd      1483:        cp = (u_char *)(ip + 1);
                   1484:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                   1485:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                   1486:                opt = cp[IPOPT_OPTVAL];
                   1487:                if (opt == IPOPT_EOL)
                   1488:                        break;
                   1489:                if (opt == IPOPT_NOP)
                   1490:                        optlen = 1;
                   1491:                else {
1.113     itojun   1492:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                   1493:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1494:                                goto bad;
                   1495:                        }
1.1       cgd      1496:                        optlen = cp[IPOPT_OLEN];
1.114     itojun   1497:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd      1498:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1499:                                goto bad;
                   1500:                        }
                   1501:                }
                   1502:                switch (opt) {
                   1503:
                   1504:                default:
                   1505:                        break;
                   1506:
                   1507:                /*
                   1508:                 * Source routing with record.
                   1509:                 * Find interface with current destination address.
                   1510:                 * If none on this machine then drop if strictly routed,
                   1511:                 * or do nothing if loosely routed.
                   1512:                 * Record interface address and bring up next address
                   1513:                 * component.  If strictly routed make sure next
                   1514:                 * address is on directly accessible net.
                   1515:                 */
                   1516:                case IPOPT_LSRR:
                   1517:                case IPOPT_SSRR:
1.47      cjs      1518:                        if (ip_allowsrcrt == 0) {
                   1519:                                type = ICMP_UNREACH;
                   1520:                                code = ICMP_UNREACH_NET_PROHIB;
                   1521:                                goto bad;
                   1522:                        }
1.114     itojun   1523:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1524:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1525:                                goto bad;
                   1526:                        }
1.1       cgd      1527:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1528:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1529:                                goto bad;
                   1530:                        }
                   1531:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft  1532:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd      1533:                        if (ia == 0) {
                   1534:                                if (opt == IPOPT_SSRR) {
                   1535:                                        type = ICMP_UNREACH;
                   1536:                                        code = ICMP_UNREACH_SRCFAIL;
                   1537:                                        goto bad;
                   1538:                                }
                   1539:                                /*
                   1540:                                 * Loose routing, and not at next destination
                   1541:                                 * yet; nothing to do except forward.
                   1542:                                 */
                   1543:                                break;
                   1544:                        }
                   1545:                        off--;                  /* 0 origin */
1.112     sommerfe 1546:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd      1547:                                /*
                   1548:                                 * End of source route.  Should be for us.
                   1549:                                 */
                   1550:                                save_rte(cp, ip->ip_src);
                   1551:                                break;
                   1552:                        }
                   1553:                        /*
                   1554:                         * locate outgoing interface
                   1555:                         */
1.244     christos 1556:                        bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1       cgd      1557:                            sizeof(ipaddr.sin_addr));
1.96      thorpej  1558:                        if (opt == IPOPT_SSRR)
1.196     itojun   1559:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej  1560:                        else
1.1       cgd      1561:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1562:                        if (ia == 0) {
                   1563:                                type = ICMP_UNREACH;
                   1564:                                code = ICMP_UNREACH_SRCFAIL;
                   1565:                                goto bad;
                   1566:                        }
                   1567:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1568:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1569:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1570:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1571:                        /*
                   1572:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1573:                         */
1.18      mycroft  1574:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1575:                        break;
                   1576:
                   1577:                case IPOPT_RR:
1.114     itojun   1578:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1579:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1580:                                goto bad;
                   1581:                        }
1.1       cgd      1582:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1583:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1584:                                goto bad;
                   1585:                        }
                   1586:                        /*
                   1587:                         * If no space remains, ignore.
                   1588:                         */
                   1589:                        off--;                  /* 0 origin */
1.112     sommerfe 1590:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1591:                                break;
1.244     christos 1592:                        bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1       cgd      1593:                            sizeof(ipaddr.sin_addr));
                   1594:                        /*
                   1595:                         * locate outgoing interface; if we're the destination,
                   1596:                         * use the incoming interface (should be same).
                   1597:                         */
1.96      thorpej  1598:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                   1599:                            == NULL &&
                   1600:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd      1601:                                type = ICMP_UNREACH;
                   1602:                                code = ICMP_UNREACH_HOST;
                   1603:                                goto bad;
                   1604:                        }
1.244     christos 1605:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1606:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1607:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1608:                        break;
                   1609:
                   1610:                case IPOPT_TS:
                   1611:                        code = cp - (u_char *)ip;
                   1612:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1613:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1614:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1615:                                goto bad;
1.114     itojun   1616:                        }
                   1617:                        if (ipt->ipt_ptr < 5) {
                   1618:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1619:                                goto bad;
                   1620:                        }
1.15      cgd      1621:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1622:                                if (++ipt->ipt_oflw == 0) {
                   1623:                                        code = (u_char *)&ipt->ipt_ptr -
                   1624:                                            (u_char *)ip;
1.1       cgd      1625:                                        goto bad;
1.114     itojun   1626:                                }
1.1       cgd      1627:                                break;
                   1628:                        }
1.104     thorpej  1629:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1630:                        switch (ipt->ipt_flg) {
                   1631:
                   1632:                        case IPOPT_TS_TSONLY:
                   1633:                                break;
                   1634:
                   1635:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1636:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1637:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1638:                                        code = (u_char *)&ipt->ipt_ptr -
                   1639:                                            (u_char *)ip;
1.1       cgd      1640:                                        goto bad;
1.114     itojun   1641:                                }
1.13      mycroft  1642:                                ipaddr.sin_addr = dst;
1.96      thorpej  1643:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1644:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1645:                                if (ia == 0)
                   1646:                                        continue;
1.104     thorpej  1647:                                bcopy(&ia->ia_addr.sin_addr,
                   1648:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1649:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1650:                                break;
                   1651:
                   1652:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1653:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1654:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1655:                                        code = (u_char *)&ipt->ipt_ptr -
                   1656:                                            (u_char *)ip;
1.1       cgd      1657:                                        goto bad;
1.114     itojun   1658:                                }
1.104     thorpej  1659:                                bcopy(cp0, &ipaddr.sin_addr,
1.1       cgd      1660:                                    sizeof(struct in_addr));
1.96      thorpej  1661:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1662:                                    == NULL)
1.1       cgd      1663:                                        continue;
                   1664:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1665:                                break;
                   1666:
                   1667:                        default:
1.114     itojun   1668:                                /* XXX can't take &ipt->ipt_flg */
                   1669:                                code = (u_char *)&ipt->ipt_ptr -
                   1670:                                    (u_char *)ip + 1;
1.1       cgd      1671:                                goto bad;
                   1672:                        }
                   1673:                        ntime = iptime();
1.107     thorpej  1674:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1675:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1676:                            sizeof(n_time));
                   1677:                        ipt->ipt_ptr += sizeof(n_time);
                   1678:                }
                   1679:        }
                   1680:        if (forward) {
1.26      thorpej  1681:                if (ip_forwsrcrt == 0) {
                   1682:                        type = ICMP_UNREACH;
                   1683:                        code = ICMP_UNREACH_SRCFAIL;
                   1684:                        goto bad;
                   1685:                }
1.1       cgd      1686:                ip_forward(m, 1);
                   1687:                return (1);
1.13      mycroft  1688:        }
                   1689:        return (0);
1.1       cgd      1690: bad:
1.13      mycroft  1691:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1692:        IP_STATINC(IP_STAT_BADOPTIONS);
1.1       cgd      1693:        return (1);
                   1694: }
                   1695:
                   1696: /*
                   1697:  * Given address of next destination (final or next hop),
                   1698:  * return internet address info of interface to be used to get there.
                   1699:  */
                   1700: struct in_ifaddr *
1.211     perry    1701: ip_rtaddr(struct in_addr dst)
1.1       cgd      1702: {
1.249     dyoung   1703:        struct rtentry *rt;
                   1704:        union {
                   1705:                struct sockaddr         dst;
                   1706:                struct sockaddr_in      dst4;
                   1707:        } u;
                   1708:
                   1709:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1710:
                   1711:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
                   1712:                return NULL;
                   1713:
                   1714:        return ifatoia(rt->rt_ifa);
1.1       cgd      1715: }
                   1716:
                   1717: /*
                   1718:  * Save incoming source route for use in replies,
                   1719:  * to be picked up later by ip_srcroute if the receiver is interested.
                   1720:  */
1.13      mycroft  1721: void
1.211     perry    1722: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1723: {
                   1724:        unsigned olen;
                   1725:
                   1726:        olen = option[IPOPT_OLEN];
                   1727: #ifdef DIAGNOSTIC
                   1728:        if (ipprintfs)
1.39      christos 1729:                printf("save_rte: olen %d\n", olen);
1.89      itojun   1730: #endif /* 0 */
1.1       cgd      1731:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1732:                return;
1.244     christos 1733:        bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1       cgd      1734:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1735:        ip_srcrt.dst = dst;
                   1736: }
                   1737:
                   1738: /*
                   1739:  * Retrieve incoming source route for use in replies,
                   1740:  * in the same form used by setsockopt.
                   1741:  * The first hop is placed before the options, will be removed later.
                   1742:  */
                   1743: struct mbuf *
1.211     perry    1744: ip_srcroute(void)
1.1       cgd      1745: {
1.109     augustss 1746:        struct in_addr *p, *q;
                   1747:        struct mbuf *m;
1.1       cgd      1748:
                   1749:        if (ip_nhops == 0)
1.237     dyoung   1750:                return NULL;
1.1       cgd      1751:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1752:        if (m == 0)
1.237     dyoung   1753:                return NULL;
1.1       cgd      1754:
1.164     matt     1755:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1756: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1757:
                   1758:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1759:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1760:            OPTSIZ;
                   1761: #ifdef DIAGNOSTIC
                   1762:        if (ipprintfs)
1.39      christos 1763:                printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1       cgd      1764: #endif
                   1765:
                   1766:        /*
                   1767:         * First save first hop for return route
                   1768:         */
                   1769:        p = &ip_srcrt.route[ip_nhops - 1];
                   1770:        *(mtod(m, struct in_addr *)) = *p--;
                   1771: #ifdef DIAGNOSTIC
                   1772:        if (ipprintfs)
1.39      christos 1773:                printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1       cgd      1774: #endif
                   1775:
                   1776:        /*
                   1777:         * Copy option fields and padding (nop) to mbuf.
                   1778:         */
                   1779:        ip_srcrt.nop = IPOPT_NOP;
                   1780:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1781:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1782:            OPTSIZ);
                   1783:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1784:            sizeof(struct in_addr) + OPTSIZ);
                   1785: #undef OPTSIZ
                   1786:        /*
                   1787:         * Record return path as an IP source route,
                   1788:         * reversing the path (pointers are now aligned).
                   1789:         */
                   1790:        while (p >= ip_srcrt.route) {
                   1791: #ifdef DIAGNOSTIC
                   1792:                if (ipprintfs)
1.39      christos 1793:                        printf(" %x", ntohl(q->s_addr));
1.1       cgd      1794: #endif
                   1795:                *q++ = *p--;
                   1796:        }
                   1797:        /*
                   1798:         * Last hop goes to final destination.
                   1799:         */
                   1800:        *q = ip_srcrt.dst;
                   1801: #ifdef DIAGNOSTIC
                   1802:        if (ipprintfs)
1.39      christos 1803:                printf(" %x\n", ntohl(q->s_addr));
1.1       cgd      1804: #endif
                   1805:        return (m);
                   1806: }
                   1807:
1.139     matt     1808: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1809:        [PRC_MSGSIZE] = EMSGSIZE,
                   1810:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1811:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1812:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1813:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1814:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1815:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1816:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1817:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1818: };
                   1819:
                   1820: /*
                   1821:  * Forward a packet.  If some error occurs return the sender
                   1822:  * an icmp packet.  Note we can't always generate a meaningful
                   1823:  * icmp message because icmp doesn't have a large enough repertoire
                   1824:  * of codes and types.
                   1825:  *
                   1826:  * If not forwarding, just drop the packet.  This could be confusing
                   1827:  * if ipforwarding was zero but some routing protocol was advancing
                   1828:  * us as a gateway to somewhere.  However, we must let the routing
                   1829:  * protocol deal with that.
                   1830:  *
                   1831:  * The srcrt parameter indicates whether the packet is being forwarded
                   1832:  * via a source route.
                   1833:  */
1.13      mycroft  1834: void
1.211     perry    1835: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1836: {
1.109     augustss 1837:        struct ip *ip = mtod(m, struct ip *);
                   1838:        struct rtentry *rt;
1.220     christos 1839:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1840:        struct mbuf *mcopy;
1.13      mycroft  1841:        n_long dest;
1.249     dyoung   1842:        union {
                   1843:                struct sockaddr         dst;
                   1844:                struct sockaddr_in      dst4;
                   1845:        } u;
1.164     matt     1846:
                   1847:        /*
                   1848:         * We are now in the output path.
                   1849:         */
                   1850:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1851:
                   1852:        /*
                   1853:         * Clear any in-bound checksum flags for this packet.
                   1854:         */
                   1855:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1856:
1.13      mycroft  1857:        dest = 0;
1.1       cgd      1858: #ifdef DIAGNOSTIC
1.224     joerg    1859:        if (ipprintfs) {
                   1860:                printf("forward: src %s ", inet_ntoa(ip->ip_src));
                   1861:                printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
                   1862:        }
1.1       cgd      1863: #endif
1.93      sommerfe 1864:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1865:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1866:                m_freem(m);
                   1867:                return;
                   1868:        }
                   1869:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1870:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1871:                return;
                   1872:        }
                   1873:
1.249     dyoung   1874:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
                   1875:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1876:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1877:                return;
1.1       cgd      1878:        }
                   1879:
                   1880:        /*
1.34      mycroft  1881:         * Save at most 68 bytes of the packet in case
1.1       cgd      1882:         * we need to generate an ICMP message to the src.
1.119     itojun   1883:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1884:         */
1.155     itojun   1885:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1886:        if (mcopy)
                   1887:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1888:
1.221     christos 1889:        ip->ip_ttl -= IPTTLDEC;
                   1890:
1.1       cgd      1891:        /*
                   1892:         * If forwarding packet using same interface that it came in on,
                   1893:         * perhaps should send a redirect to sender to shortcut a hop.
                   1894:         * Only send redirect if source is sending directly to us,
                   1895:         * and if packet was not source routed (or has any options).
                   1896:         * Also, don't send redirect if forwarding using a default route
                   1897:         * or a route modified by a redirect.
                   1898:         */
                   1899:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1900:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1901:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1902:            ipsendredirects && !srcrt) {
1.19      mycroft  1903:                if (rt->rt_ifa &&
                   1904:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1905:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1906:                        if (rt->rt_flags & RTF_GATEWAY)
                   1907:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1908:                        else
                   1909:                                dest = ip->ip_dst.s_addr;
                   1910:                        /*
                   1911:                         * Router requirements says to only send host
                   1912:                         * redirects.
                   1913:                         */
                   1914:                        type = ICMP_REDIRECT;
                   1915:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1916: #ifdef DIAGNOSTIC
1.77      thorpej  1917:                        if (ipprintfs)
                   1918:                                printf("redirect (%d) to %x\n", code,
                   1919:                                    (u_int32_t)dest);
1.1       cgd      1920: #endif
                   1921:                }
                   1922:        }
                   1923:
1.238     dyoung   1924:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1925:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174     itojun   1926:            (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173     jonathan 1927:
1.1       cgd      1928:        if (error)
1.266     thorpej  1929:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1930:        else {
1.266     thorpej  1931:                uint64_t *ips = IP_STAT_GETREF();
                   1932:                ips[IP_STAT_FORWARD]++;
                   1933:                if (type) {
                   1934:                        ips[IP_STAT_REDIRECTSENT]++;
                   1935:                        IP_STAT_PUTREF();
                   1936:                } else {
                   1937:                        IP_STAT_PUTREF();
1.63      matt     1938:                        if (mcopy) {
                   1939: #ifdef GATEWAY
1.64      thorpej  1940:                                if (mcopy->m_flags & M_CANFASTFWD)
                   1941:                                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1942: #endif
1.1       cgd      1943:                                m_freem(mcopy);
1.63      matt     1944:                        }
1.1       cgd      1945:                        return;
                   1946:                }
                   1947:        }
                   1948:        if (mcopy == NULL)
                   1949:                return;
1.13      mycroft  1950:
1.1       cgd      1951:        switch (error) {
                   1952:
                   1953:        case 0:                         /* forwarded, but need redirect */
                   1954:                /* type, code set above */
                   1955:                break;
                   1956:
                   1957:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1958:        case EHOSTUNREACH:
                   1959:        case ENETDOWN:
                   1960:        case EHOSTDOWN:
                   1961:        default:
                   1962:                type = ICMP_UNREACH;
                   1963:                code = ICMP_UNREACH_HOST;
                   1964:                break;
                   1965:
                   1966:        case EMSGSIZE:
                   1967:                type = ICMP_UNREACH;
                   1968:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1969:
1.261     dyoung   1970:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL) {
1.263     cube     1971:
                   1972: #if defined(IPSEC) || defined(FAST_IPSEC)
                   1973:                        /*
                   1974:                         * If the packet is routed over IPsec tunnel, tell the
                   1975:                         * originator the tunnel MTU.
                   1976:                         *      tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
                   1977:                         * XXX quickhack!!!
                   1978:                         */
                   1979:
1.89      itojun   1980:                        struct secpolicy *sp;
                   1981:                        int ipsecerror;
1.95      itojun   1982:                        size_t ipsechdr;
1.89      itojun   1983:                        struct route *ro;
                   1984:
                   1985:                        sp = ipsec4_getpolicybyaddr(mcopy,
1.170     itojun   1986:                            IPSEC_DIR_OUTBOUND, IP_FORWARDING,
                   1987:                            &ipsecerror);
1.263     cube     1988: #endif
1.89      itojun   1989:
1.263     cube     1990:                        destmtu = rt->rt_ifp->if_mtu;
                   1991: #if defined(IPSEC) || defined(FAST_IPSEC)
                   1992:                        if (sp != NULL) {
1.89      itojun   1993:                                /* count IPsec header size */
1.95      itojun   1994:                                ipsechdr = ipsec4_hdrsiz(mcopy,
1.170     itojun   1995:                                    IPSEC_DIR_OUTBOUND, NULL);
1.89      itojun   1996:
                   1997:                                /*
                   1998:                                 * find the correct route for outer IPv4
                   1999:                                 * header, compute tunnel MTU.
                   2000:                                 */
1.220     christos 2001:
1.89      itojun   2002:                                if (sp->req != NULL
1.95      itojun   2003:                                 && sp->req->sav != NULL
                   2004:                                 && sp->req->sav->sah != NULL) {
                   2005:                                        ro = &sp->req->sav->sah->sa_route;
1.257     dyoung   2006:                                        if (rt && rt->rt_ifp) {
1.220     christos 2007:                                                destmtu =
1.257     dyoung   2008:                                                    rt->rt_rmx.rmx_mtu ?
                   2009:                                                    rt->rt_rmx.rmx_mtu :
                   2010:                                                    rt->rt_ifp->if_mtu;
1.220     christos 2011:                                                destmtu -= ipsechdr;
1.89      itojun   2012:                                        }
                   2013:                                }
                   2014:
1.173     jonathan 2015: #ifdef IPSEC
1.89      itojun   2016:                                key_freesp(sp);
1.173     jonathan 2017: #else
                   2018:                                KEY_FREESP(&sp);
                   2019: #endif
1.89      itojun   2020:                        }
1.263     cube     2021: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.89      itojun   2022:                }
1.266     thorpej  2023:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      2024:                break;
                   2025:
                   2026:        case ENOBUFS:
1.143     itojun   2027: #if 1
                   2028:                /*
                   2029:                 * a router should not generate ICMP_SOURCEQUENCH as
                   2030:                 * required in RFC1812 Requirements for IP Version 4 Routers.
                   2031:                 * source quench could be a big problem under DoS attacks,
1.149     wiz      2032:                 * or if the underlying interface is rate-limited.
1.143     itojun   2033:                 */
                   2034:                if (mcopy)
                   2035:                        m_freem(mcopy);
                   2036:                return;
                   2037: #else
1.1       cgd      2038:                type = ICMP_SOURCEQUENCH;
                   2039:                code = 0;
                   2040:                break;
1.143     itojun   2041: #endif
1.1       cgd      2042:        }
1.220     christos 2043:        icmp_error(mcopy, type, code, dest, destmtu);
1.44      thorpej  2044: }
                   2045:
                   2046: void
1.211     perry    2047: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   2048:     struct mbuf *m)
1.44      thorpej  2049: {
                   2050:
                   2051:        if (inp->inp_socket->so_options & SO_TIMESTAMP) {
                   2052:                struct timeval tv;
                   2053:
                   2054:                microtime(&tv);
1.244     christos 2055:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  2056:                    SCM_TIMESTAMP, SOL_SOCKET);
                   2057:                if (*mp)
                   2058:                        mp = &(*mp)->m_next;
                   2059:        }
                   2060:        if (inp->inp_flags & INP_RECVDSTADDR) {
1.244     christos 2061:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  2062:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   2063:                if (*mp)
                   2064:                        mp = &(*mp)->m_next;
                   2065:        }
                   2066: #ifdef notyet
                   2067:        /*
                   2068:         * XXX
                   2069:         * Moving these out of udp_input() made them even more broken
                   2070:         * than they already were.
                   2071:         *      - fenner@parc.xerox.com
                   2072:         */
                   2073:        /* options were tossed already */
                   2074:        if (inp->inp_flags & INP_RECVOPTS) {
1.244     christos 2075:                *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44      thorpej  2076:                    sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
                   2077:                if (*mp)
                   2078:                        mp = &(*mp)->m_next;
                   2079:        }
                   2080:        /* ip_srcroute doesn't do what we want here, need to fix */
                   2081:        if (inp->inp_flags & INP_RECVRETOPTS) {
1.244     christos 2082:                *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44      thorpej  2083:                    sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
                   2084:                if (*mp)
                   2085:                        mp = &(*mp)->m_next;
                   2086:        }
                   2087: #endif
                   2088:        if (inp->inp_flags & INP_RECVIF) {
                   2089:                struct sockaddr_dl sdl;
                   2090:
1.252     dyoung   2091:                sockaddr_dl_init(&sdl, sizeof(sdl),
                   2092:                    (m->m_pkthdr.rcvif != NULL)
                   2093:                        ?  m->m_pkthdr.rcvif->if_index
                   2094:                        : 0,
                   2095:                        0, NULL, 0, NULL, 0);
1.251     dyoung   2096:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  2097:                if (*mp)
                   2098:                        mp = &(*mp)->m_next;
                   2099:        }
1.13      mycroft  2100: }
                   2101:
1.189     atatat   2102: /*
1.228     elad     2103:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   2104:  */
                   2105: static int
                   2106: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   2107: {
                   2108:        int error, tmp;
                   2109:        struct sysctlnode node;
                   2110:
                   2111:        node = *rnode;
                   2112:        tmp = ip_forwsrcrt;
                   2113:        node.sysctl_data = &tmp;
                   2114:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2115:        if (error || newp == NULL)
                   2116:                return (error);
                   2117:
1.230     elad     2118:        if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232     elad     2119:            0, NULL, NULL, NULL))
1.228     elad     2120:                return (EPERM);
                   2121:
                   2122:        ip_forwsrcrt = tmp;
                   2123:
                   2124:        return (0);
                   2125: }
                   2126:
                   2127: /*
1.189     atatat   2128:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   2129:  * range of the new value and tweaks timers if it changes.
                   2130:  */
                   2131: static int
                   2132: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  2133: {
1.189     atatat   2134:        int error, tmp;
                   2135:        struct sysctlnode node;
                   2136:
                   2137:        node = *rnode;
                   2138:        tmp = ip_mtudisc_timeout;
                   2139:        node.sysctl_data = &tmp;
                   2140:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2141:        if (error || newp == NULL)
                   2142:                return (error);
                   2143:        if (tmp < 0)
                   2144:                return (EINVAL);
1.52      thorpej  2145:
1.189     atatat   2146:        ip_mtudisc_timeout = tmp;
                   2147:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   2148:
                   2149:        return (0);
                   2150: }
1.54      lukem    2151:
1.65      matt     2152: #ifdef GATEWAY
1.189     atatat   2153: /*
1.247     liamjfoy 2154:  * sysctl helper routine for net.inet.ip.maxflows.
1.189     atatat   2155:  */
                   2156: static int
                   2157: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
                   2158: {
                   2159:        int s;
1.67      thorpej  2160:
1.217     atatat   2161:        s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247     liamjfoy 2162:        if (s || newp == NULL)
1.189     atatat   2163:                return (s);
1.212     perry    2164:
1.189     atatat   2165:        s = splsoftnet();
1.265     thorpej  2166:        ipflow_prune();
1.189     atatat   2167:        splx(s);
1.144     martin   2168:
1.189     atatat   2169:        return (0);
                   2170: }
1.248     liamjfoy 2171:
                   2172: static int
                   2173: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
                   2174: {
                   2175:        int error, tmp;
                   2176:        struct sysctlnode node;
                   2177:
                   2178:        node = *rnode;
                   2179:        tmp = ip_hashsize;
                   2180:        node.sysctl_data = &tmp;
                   2181:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2182:        if (error || newp == NULL)
                   2183:                return (error);
                   2184:
                   2185:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   2186:                /*
                   2187:                 * Can only fail due to malloc()
                   2188:                 */
                   2189:                if (ipflow_invalidate_all(tmp))
                   2190:                        return ENOMEM;
                   2191:        } else {
                   2192:                /*
                   2193:                 * EINVAL if not a power of 2
                   2194:                 */
                   2195:                return EINVAL;
                   2196:        }
                   2197:
                   2198:        return (0);
                   2199: }
1.189     atatat   2200: #endif /* GATEWAY */
1.117     tron     2201:
1.266     thorpej  2202: static int
                   2203: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   2204: {
                   2205:
1.266.2.1! yamt     2206:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  2207: }
1.131     itojun   2208:
1.189     atatat   2209: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
                   2210: {
                   2211:        extern int subnetsarelocal, hostzeroisbroadcast;
1.180     jonathan 2212:
1.197     atatat   2213:        sysctl_createv(clog, 0, NULL, NULL,
                   2214:                       CTLFLAG_PERMANENT,
1.189     atatat   2215:                       CTLTYPE_NODE, "net", NULL,
                   2216:                       NULL, 0, NULL, 0,
                   2217:                       CTL_NET, CTL_EOL);
1.197     atatat   2218:        sysctl_createv(clog, 0, NULL, NULL,
                   2219:                       CTLFLAG_PERMANENT,
1.203     atatat   2220:                       CTLTYPE_NODE, "inet",
                   2221:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   2222:                       NULL, 0, NULL, 0,
                   2223:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   2224:        sysctl_createv(clog, 0, NULL, NULL,
                   2225:                       CTLFLAG_PERMANENT,
1.203     atatat   2226:                       CTLTYPE_NODE, "ip",
                   2227:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   2228:                       NULL, 0, NULL, 0,
                   2229:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    2230:
1.197     atatat   2231:        sysctl_createv(clog, 0, NULL, NULL,
                   2232:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2233:                       CTLTYPE_INT, "forwarding",
                   2234:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   2235:                       NULL, 0, &ipforwarding, 0,
                   2236:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2237:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   2238:        sysctl_createv(clog, 0, NULL, NULL,
                   2239:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2240:                       CTLTYPE_INT, "redirect",
                   2241:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   2242:                       NULL, 0, &ipsendredirects, 0,
                   2243:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2244:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   2245:        sysctl_createv(clog, 0, NULL, NULL,
                   2246:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2247:                       CTLTYPE_INT, "ttl",
                   2248:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   2249:                       NULL, 0, &ip_defttl, 0,
                   2250:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2251:                       IPCTL_DEFTTL, CTL_EOL);
                   2252: #ifdef IPCTL_DEFMTU
1.197     atatat   2253:        sysctl_createv(clog, 0, NULL, NULL,
                   2254:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   2255:                       CTLTYPE_INT, "mtu",
                   2256:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   2257:                       NULL, 0, &ip_mtu, 0,
                   2258:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2259:                       IPCTL_DEFMTU, CTL_EOL);
                   2260: #endif /* IPCTL_DEFMTU */
1.197     atatat   2261:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     2262:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2263:                       CTLTYPE_INT, "forwsrcrt",
                   2264:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   2265:                                    "datagrams"),
1.228     elad     2266:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   2267:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2268:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   2269:        sysctl_createv(clog, 0, NULL, NULL,
                   2270:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2271:                       CTLTYPE_INT, "directed-broadcast",
                   2272:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   2273:                       NULL, 0, &ip_directedbcast, 0,
                   2274:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2275:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   2276:        sysctl_createv(clog, 0, NULL, NULL,
                   2277:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2278:                       CTLTYPE_INT, "allowsrcrt",
                   2279:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   2280:                       NULL, 0, &ip_allowsrcrt, 0,
                   2281:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2282:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.197     atatat   2283:        sysctl_createv(clog, 0, NULL, NULL,
                   2284:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2285:                       CTLTYPE_INT, "subnetsarelocal",
                   2286:                       SYSCTL_DESCR("Whether logical subnets are considered "
                   2287:                                    "local"),
1.189     atatat   2288:                       NULL, 0, &subnetsarelocal, 0,
                   2289:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2290:                       IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197     atatat   2291:        sysctl_createv(clog, 0, NULL, NULL,
                   2292:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2293:                       CTLTYPE_INT, "mtudisc",
                   2294:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   2295:                       NULL, 0, &ip_mtudisc, 0,
                   2296:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2297:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   2298:        sysctl_createv(clog, 0, NULL, NULL,
                   2299:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2300:                       CTLTYPE_INT, "anonportmin",
                   2301:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   2302:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   2303:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2304:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   2305:        sysctl_createv(clog, 0, NULL, NULL,
                   2306:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2307:                       CTLTYPE_INT, "anonportmax",
                   2308:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   2309:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   2310:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2311:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   2312:        sysctl_createv(clog, 0, NULL, NULL,
                   2313:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2314:                       CTLTYPE_INT, "mtudisctimeout",
                   2315:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189     atatat   2316:                       sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
                   2317:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2318:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   2319: #ifdef GATEWAY
1.197     atatat   2320:        sysctl_createv(clog, 0, NULL, NULL,
                   2321:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2322:                       CTLTYPE_INT, "maxflows",
                   2323:                       SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189     atatat   2324:                       sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
                   2325:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2326:                       IPCTL_MAXFLOWS, CTL_EOL);
1.248     liamjfoy 2327:        sysctl_createv(clog, 0, NULL, NULL,
                   2328:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2329:                        CTLTYPE_INT, "hashsize",
                   2330:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
                   2331:                        sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
                   2332:                        CTL_NET, PF_INET, IPPROTO_IP,
                   2333:                        CTL_CREATE, CTL_EOL);
1.189     atatat   2334: #endif /* GATEWAY */
1.197     atatat   2335:        sysctl_createv(clog, 0, NULL, NULL,
                   2336:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2337:                       CTLTYPE_INT, "hostzerobroadcast",
                   2338:                       SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189     atatat   2339:                       NULL, 0, &hostzeroisbroadcast, 0,
                   2340:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2341:                       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
                   2342: #if NGIF > 0
1.197     atatat   2343:        sysctl_createv(clog, 0, NULL, NULL,
                   2344:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2345:                       CTLTYPE_INT, "gifttl",
                   2346:                       SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189     atatat   2347:                       NULL, 0, &ip_gif_ttl, 0,
                   2348:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2349:                       IPCTL_GIF_TTL, CTL_EOL);
                   2350: #endif /* NGIF */
                   2351: #ifndef IPNOPRIVPORTS
1.197     atatat   2352:        sysctl_createv(clog, 0, NULL, NULL,
                   2353:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2354:                       CTLTYPE_INT, "lowportmin",
                   2355:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   2356:                                    "to assign"),
1.189     atatat   2357:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   2358:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2359:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   2360:        sysctl_createv(clog, 0, NULL, NULL,
                   2361:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2362:                       CTLTYPE_INT, "lowportmax",
                   2363:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   2364:                                    "to assign"),
1.189     atatat   2365:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   2366:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2367:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   2368: #endif /* IPNOPRIVPORTS */
1.197     atatat   2369:        sysctl_createv(clog, 0, NULL, NULL,
                   2370:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2371:                       CTLTYPE_INT, "maxfragpackets",
                   2372:                       SYSCTL_DESCR("Maximum number of fragments to retain for "
                   2373:                                    "possible reassembly"),
1.189     atatat   2374:                       NULL, 0, &ip_maxfragpackets, 0,
                   2375:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2376:                       IPCTL_MAXFRAGPACKETS, CTL_EOL);
                   2377: #if NGRE > 0
1.197     atatat   2378:        sysctl_createv(clog, 0, NULL, NULL,
                   2379:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2380:                       CTLTYPE_INT, "grettl",
                   2381:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   2382:                       NULL, 0, &ip_gre_ttl, 0,
                   2383:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2384:                       IPCTL_GRE_TTL, CTL_EOL);
                   2385: #endif /* NGRE */
1.197     atatat   2386:        sysctl_createv(clog, 0, NULL, NULL,
                   2387:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2388:                       CTLTYPE_INT, "checkinterface",
                   2389:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   2390:                                    "from RFC1122"),
1.189     atatat   2391:                       NULL, 0, &ip_checkinterface, 0,
                   2392:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2393:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   2394:        sysctl_createv(clog, 0, NULL, NULL,
                   2395:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   2396:                       CTLTYPE_INT, "random_id",
                   2397:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   2398:                       NULL, 0, &ip_do_randomid, 0,
                   2399:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2400:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  2401:        sysctl_createv(clog, 0, NULL, NULL,
                   2402:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2403:                       CTLTYPE_INT, "do_loopback_cksum",
                   2404:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   2405:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   2406:                       CTL_NET, PF_INET, IPPROTO_IP,
                   2407:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     2408:        sysctl_createv(clog, 0, NULL, NULL,
                   2409:                       CTLFLAG_PERMANENT,
                   2410:                       CTLTYPE_STRUCT, "stats",
                   2411:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  2412:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     2413:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   2414:                       CTL_EOL);
1.1       cgd      2415: }
1.266     thorpej  2416:
                   2417: void
                   2418: ip_statinc(u_int stat)
                   2419: {
                   2420:
                   2421:        KASSERT(stat < IP_NSTATS);
                   2422:        IP_STATINC(stat);
                   2423: }

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