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Annotation of src/sys/netinet/ip_input.c, Revision 1.334

1.334   ! ozaki-r     1: /*     $NetBSD: ip_input.c,v 1.333 2016/07/04 08:10:50 ozaki-r 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>
1.334   ! ozaki-r    94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.333 2016/07/04 08:10:50 ozaki-r Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.278     christos   98: #include "opt_compat_netbsd.h"
1.62      matt       99: #include "opt_gateway.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.324     pooka     104: #endif
1.1       cgd       105:
1.325     roy       106: #include "arp.h"
                    107:
1.5       mycroft   108: #include <sys/param.h>
                    109: #include <sys/systm.h>
1.318     rmind     110: #include <sys/cpu.h>
1.5       mycroft   111: #include <sys/mbuf.h>
                    112: #include <sys/domain.h>
                    113: #include <sys/protosw.h>
                    114: #include <sys/socket.h>
1.44      thorpej   115: #include <sys/socketvar.h>
1.5       mycroft   116: #include <sys/errno.h>
                    117: #include <sys/time.h>
                    118: #include <sys/kernel.h>
1.72      thorpej   119: #include <sys/pool.h>
1.28      christos  120: #include <sys/sysctl.h>
1.230     elad      121: #include <sys/kauth.h>
1.1       cgd       122:
1.5       mycroft   123: #include <net/if.h>
1.44      thorpej   124: #include <net/if_dl.h>
1.5       mycroft   125: #include <net/route.h>
1.318     rmind     126: #include <net/pktqueue.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
1.215     yamt      133: #include <netinet/in_proto.h>
1.5       mycroft   134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
1.266     thorpej   136: #include <netinet/ip_private.h>
1.5       mycroft   137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
1.144     martin    141: #include <net/if_gre.h>
                    142: #include "gre.h"
1.111     jdolecek  143:
                    144: #ifdef MROUTING
                    145: #include <netinet/ip_mroute.h>
                    146: #endif
1.302     christos  147: #include <netinet/portalgo.h>
1.89      itojun    148:
1.304     christos  149: #ifdef IPSEC
1.173     jonathan  150: #include <netipsec/ipsec.h>
1.305     rmind     151: #endif
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:
1.278     christos  176: #ifdef COMPAT_50
                    177: #include <compat/sys/time.h>
                    178: #include <compat/sys/socket.h>
                    179: #endif
                    180:
1.27      thorpej   181: /*
                    182:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    183:  * configuration using this option will Just Work.
                    184:  */
                    185: #ifndef IPDIRECTEDBCAST
                    186: #ifdef DIRECTED_BROADCAST
                    187: #define IPDIRECTEDBCAST        1
                    188: #else
                    189: #define        IPDIRECTEDBCAST 0
                    190: #endif /* DIRECTED_BROADCAST */
                    191: #endif /* IPDIRECTEDBCAST */
1.1       cgd       192: int    ipforwarding = IPFORWARDING;
                    193: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   194: int    ip_defttl = IPDEFTTL;
1.26      thorpej   195: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   196: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       197: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       198: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    199: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       200: #ifdef DIAGNOSTIC
                    201: int    ipprintfs = 0;
                    202: #endif
1.184     jonathan  203:
                    204: int    ip_do_randomid = 0;
                    205:
1.165     christos  206: /*
                    207:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    208:  * the Strong ES model described in RFC 1122, but since the routing table
                    209:  * and transmit implementation do not implement the Strong ES model,
                    210:  * setting this to 1 results in an odd hybrid.
                    211:  *
                    212:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    213:  * to translate the destination address to another local interface.
                    214:  *
                    215:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    216:  * to the loopback interface instead of the interface where the
                    217:  * packets for those addresses are received.
                    218:  */
1.318     rmind     219: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  220:
1.60      kml       221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    222:
1.318     rmind     223: pktqueue_t *           ip_pktq                 __read_mostly;
                    224: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    225: ipid_state_t *         ip_ids                  __read_mostly;
                    226: percpu_t *             ipstat_percpu           __read_mostly;
                    227:
                    228: static struct route    ipforward_rt            __cacheline_aligned;
1.286     tls       229:
1.183     jonathan  230: uint16_t ip_id;
1.75      thorpej   231:
1.135     thorpej   232: #ifdef INET_CSUM_COUNTERS
                    233: #include <sys/device.h>
                    234:
                    235: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    236:     NULL, "inet", "hwcsum bad");
                    237: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    238:     NULL, "inet", "hwcsum ok");
                    239: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    240:     NULL, "inet", "swcsum");
                    241:
                    242: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    243:
1.201     matt      244: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    245: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    246: EVCNT_ATTACH_STATIC(ip_swcsum);
                    247:
1.135     thorpej   248: #else
                    249:
                    250: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    251:
                    252: #endif /* INET_CSUM_COUNTERS */
                    253:
1.1       cgd       254: /*
                    255:  * We need to save the IP options in case a protocol wants to respond
                    256:  * to an incoming packet over the same route if the packet got here
                    257:  * using IP source routing.  This allows connection establishment and
                    258:  * maintenance when the remote end is on a network that is not known
                    259:  * to us.
                    260:  */
1.311     rmind     261:
                    262: static int     ip_nhops = 0;
                    263:
1.1       cgd       264: static struct ip_srcrt {
                    265:        struct  in_addr dst;                    /* final destination */
                    266:        char    nop;                            /* one NOP to align */
                    267:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    268:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    269: } ip_srcrt;
                    270:
1.295     dyoung    271: static int ip_drainwanted;
                    272:
1.318     rmind     273: struct sockaddr_in ipaddr = {
                    274:        .sin_len = sizeof(ipaddr),
                    275:        .sin_family = AF_INET,
                    276: };
                    277:
1.210     perry     278: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   279:
1.164     matt      280: #ifdef MBUFTRACE
1.234     dogcow    281: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    282: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      283: #endif
                    284:
1.318     rmind     285: static void            ipintr(void *);
1.312     rmind     286: static void            ip_input(struct mbuf *);
1.329     ozaki-r   287: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     288: static bool            ip_dooptions(struct mbuf *);
                    289: static struct in_ifaddr *ip_rtaddr(struct in_addr);
                    290: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     291:
1.333     ozaki-r   292: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    293:                            int *);
                    294: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    295:                            struct ip *);
                    296:
1.318     rmind     297: /* XXX: Not yet enabled. */
                    298: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    299: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
                    300:
1.1       cgd       301: /*
                    302:  * IP initialization: fill in IP protocol switch table.
                    303:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    304:  */
1.8       mycroft   305: void
1.211     perry     306: ip_init(void)
1.1       cgd       307: {
1.199     matt      308:        const struct protosw *pr;
1.1       cgd       309:
1.311     rmind     310:        in_init();
1.284     pooka     311:        sysctl_net_inet_ip_setup(NULL);
                    312:
1.311     rmind     313:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    314:        KASSERT(pr != NULL);
1.275     pooka     315:
1.319     ozaki-r   316:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     317:        KASSERT(ip_pktq != NULL);
                    318:
1.328     riastrad  319:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    320:                ip_protox[i] = pr - inetsw;
1.311     rmind     321:        }
1.328     riastrad  322:        for (pr = inetdomain.dom_protosw;
                    323:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       324:                if (pr->pr_domain->dom_family == PF_INET &&
                    325:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  326:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  327:
1.288     rmind     328:        ip_reass_init();
1.190     jonathan  329:
1.291     rmind     330:        ip_ids = ip_id_init();
1.323     ozaki-r   331:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  332:
1.160     itojun    333:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   334: #ifdef GATEWAY
1.311     rmind     335:        ipflow_init();
1.73      thorpej   336: #endif
1.121     thorpej   337:
                    338:        /* Register our Packet Filter hook. */
1.308     rmind     339:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    340:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   341:
1.164     matt      342: #ifdef MBUFTRACE
                    343:        MOWNER_ATTACH(&ip_tx_mowner);
                    344:        MOWNER_ATTACH(&ip_rx_mowner);
                    345: #endif /* MBUFTRACE */
1.266     thorpej   346:
                    347:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       348: }
                    349:
1.333     ozaki-r   350: static struct in_ifaddr *
                    351: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    352: {
                    353:        struct in_ifaddr *ia = NULL;
                    354:        int checkif;
                    355:
                    356:        /*
                    357:         * Enable a consistency check between the destination address
                    358:         * and the arrival interface for a unicast packet (the RFC 1122
                    359:         * strong ES model) if IP forwarding is disabled and the packet
                    360:         * is not locally generated.
                    361:         *
                    362:         * XXX - Checking also should be disabled if the destination
                    363:         * address is ipnat'ed to a different interface.
                    364:         *
                    365:         * XXX - Checking is incompatible with IP aliases added
                    366:         * to the loopback interface instead of the interface where
                    367:         * the packets are received.
                    368:         *
                    369:         * XXX - We need to add a per ifaddr flag for this so that
                    370:         * we get finer grain control.
                    371:         */
                    372:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    373:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    374:
1.334   ! ozaki-r   375:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   376:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    377:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    378:                                continue;
                    379:                        if (checkif && ia->ia_ifp != ifp)
                    380:                                continue;
                    381:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    382:                                break;
                    383:                        else
                    384:                                downmatch++;
                    385:                }
                    386:        }
                    387:
                    388:        return ia;
                    389: }
                    390:
                    391: static struct in_ifaddr *
                    392: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    393: {
                    394:        struct in_ifaddr *ia = NULL;
                    395:        struct ifaddr *ifa;
                    396:
                    397:        IFADDR_FOREACH(ifa, ifp) {
                    398:                if (ifa->ifa_addr->sa_family != AF_INET)
                    399:                        continue;
                    400:                ia = ifatoia(ifa);
                    401:                if (ia->ia4_flags & IN_IFF_NOTREADY)
                    402:                        continue;
                    403:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    404:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    405:                    /*
                    406:                     * Look for all-0's host part (old broadcast addr),
                    407:                     * either for subnet or net.
                    408:                     */
                    409:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    410:                    ip->ip_dst.s_addr == ia->ia_net)
                    411:                        goto matched;
                    412:                /*
                    413:                 * An interface with IP address zero accepts
                    414:                 * all packets that arrive on that interface.
                    415:                 */
                    416:                if (in_nullhost(ia->ia_addr.sin_addr))
                    417:                        goto matched;
                    418:        }
                    419:        ia = NULL;
                    420:
                    421: matched:
                    422:        return ia;
                    423: }
                    424:
1.1       cgd       425: /*
1.318     rmind     426:  * IP software interrupt routine.
1.89      itojun    427:  */
1.318     rmind     428: static void
                    429: ipintr(void *arg __unused)
1.89      itojun    430: {
                    431:        struct mbuf *m;
1.286     tls       432:
1.318     rmind     433:        KASSERT(cpu_softintr_p());
1.89      itojun    434:
1.268     ad        435:        mutex_enter(softnet_lock);
1.318     rmind     436:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    437:                ip_input(m);
                    438:        }
1.268     ad        439:        mutex_exit(softnet_lock);
1.89      itojun    440: }
                    441:
                    442: /*
1.318     rmind     443:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       444:  * try to reassemble.  Process options.  Pass to next level.
                    445:  */
1.312     rmind     446: static void
1.89      itojun    447: ip_input(struct mbuf *m)
1.1       cgd       448: {
1.109     augustss  449:        struct ip *ip = NULL;
                    450:        struct in_ifaddr *ia;
1.288     rmind     451:        int hlen = 0, len;
1.100     itojun    452:        int downmatch;
1.169     itojun    453:        int srcrt = 0;
1.314     rmind     454:        ifnet_t *ifp;
1.329     ozaki-r   455:        struct psref psref;
1.1       cgd       456:
1.318     rmind     457:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    458:            "interrupt handler; synchronization assumptions violated");
                    459:
1.164     matt      460:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     461:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   462:
                    463:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   464:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   465:                goto out;
1.164     matt      466:
1.1       cgd       467:        /*
                    468:         * If no IP addresses have been set yet but the interfaces
                    469:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     470:         * Note: we pre-check without locks held.
1.1       cgd       471:         */
1.318     rmind     472:        if (!TAILQ_FIRST(&in_ifaddrhead)) {
1.332     ozaki-r   473:                goto out;
1.318     rmind     474:        }
1.266     thorpej   475:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     476:
1.154     thorpej   477:        /*
                    478:         * If the IP header is not aligned, slurp it up into a new
                    479:         * mbuf with space for link headers, in the event we forward
                    480:         * it.  Otherwise, if it is aligned, make sure the entire
                    481:         * base IP header is in the first mbuf of the chain.
                    482:         */
1.244     christos  483:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   484:                if ((m = m_copyup(m, sizeof(struct ip),
                    485:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    486:                        /* XXXJRT new stat, please */
1.266     thorpej   487:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   488:                        goto out;
1.154     thorpej   489:                }
                    490:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    491:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   492:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   493:                        goto out;
1.154     thorpej   494:                }
1.1       cgd       495:        }
                    496:        ip = mtod(m, struct ip *);
1.13      mycroft   497:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   498:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   499:                goto out;
1.13      mycroft   500:        }
1.1       cgd       501:        hlen = ip->ip_hl << 2;
                    502:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   503:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   504:                goto out;
1.1       cgd       505:        }
                    506:        if (hlen > m->m_len) {
1.298     liamjfoy  507:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   508:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   509:                        goto out;
1.1       cgd       510:                }
                    511:                ip = mtod(m, struct ip *);
                    512:        }
1.98      thorpej   513:
1.85      hwr       514:        /*
1.99      thorpej   515:         * RFC1122: packets with a multicast source address are
1.98      thorpej   516:         * not allowed.
1.85      hwr       517:         */
                    518:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   519:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   520:                goto out;
1.129     itojun    521:        }
                    522:
                    523:        /* 127/8 must not appear on wire - RFC1122 */
                    524:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    525:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     526:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   527:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   528:                        goto out;
1.130     itojun    529:                }
1.85      hwr       530:        }
                    531:
1.135     thorpej   532:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     533:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   534:                 M_CSUM_IPv4_BAD)) {
                    535:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    536:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   537:                IP_STATINC(IP_STAT_BADSUM);
                    538:                goto out;
1.135     thorpej   539:
                    540:        case M_CSUM_IPv4:
                    541:                /* Checksum was okay. */
                    542:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    543:                break;
                    544:
                    545:        default:
1.206     thorpej   546:                /*
                    547:                 * Must compute it ourselves.  Maybe skip checksum on
                    548:                 * loopback interfaces.
                    549:                 */
1.314     rmind     550:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    551:                    ip_do_loopback_cksum)) {
1.206     thorpej   552:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   553:                        if (in_cksum(m, hlen) != 0) {
                    554:                                IP_STATINC(IP_STAT_BADSUM);
                    555:                                goto out;
                    556:                        }
1.206     thorpej   557:                }
1.135     thorpej   558:                break;
1.1       cgd       559:        }
                    560:
1.121     thorpej   561:        /* Retrieve the packet length. */
                    562:        len = ntohs(ip->ip_len);
1.81      proff     563:
                    564:        /*
                    565:         * Check for additional length bogosity
                    566:         */
1.84      proff     567:        if (len < hlen) {
1.266     thorpej   568:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   569:                goto out;
1.81      proff     570:        }
1.1       cgd       571:
                    572:        /*
                    573:         * Check that the amount of data in the buffers
                    574:         * is as at least much as the IP header would have us expect.
                    575:         * Trim mbufs if longer than we expect.
                    576:         * Drop packet if shorter than we expect.
                    577:         */
1.35      mycroft   578:        if (m->m_pkthdr.len < len) {
1.266     thorpej   579:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   580:                goto out;
1.1       cgd       581:        }
1.35      mycroft   582:        if (m->m_pkthdr.len > len) {
1.1       cgd       583:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   584:                        m->m_len = len;
                    585:                        m->m_pkthdr.len = len;
1.1       cgd       586:                } else
1.35      mycroft   587:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       588:        }
                    589:
1.64      thorpej   590:        /*
                    591:         * Assume that we can create a fast-forward IP flow entry
                    592:         * based on this packet.
                    593:         */
                    594:        m->m_flags |= M_CANFASTFWD;
                    595:
1.33      mrg       596:        /*
1.64      thorpej   597:         * Run through list of hooks for input packets.  If there are any
                    598:         * filters which require that additional packets in the flow are
                    599:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    600:         * Note that filters must _never_ set this flag, as another filter
                    601:         * in the list may have previously cleared it.
1.33      mrg       602:         */
1.304     christos  603: #if defined(IPSEC)
1.317     christos  604:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    605: #else
                    606:        if (1)
                    607: #endif
                    608:        {
1.314     rmind     609:                struct in_addr odst = ip->ip_dst;
1.318     rmind     610:                bool freed;
1.169     itojun    611:
1.318     rmind     612:                SOFTNET_LOCK();
                    613:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    614:                SOFTNET_UNLOCK();
                    615:                if (freed || m == NULL) {
1.329     ozaki-r   616:                        goto out;
1.318     rmind     617:                }
1.127     itojun    618:                ip = mtod(m, struct ip *);
1.142     darrenr   619:                hlen = ip->ip_hl << 2;
1.318     rmind     620:
1.205     darrenr   621:                /*
                    622:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    623:                 * from generating ICMP redirects for packets that have
                    624:                 * been redirected by a hook back out on to the same LAN that
                    625:                 * they came from and is not an indication that the packet
                    626:                 * is being inffluenced by source routing options.  This
                    627:                 * allows things like
                    628:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    629:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    630:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    631:                 * also requires a "map tlp0 ..." to complete the story.
                    632:                 * One might argue whether or not this kind of network config.
1.212     perry     633:                 * should be supported in this manner...
1.205     darrenr   634:                 */
1.169     itojun    635:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    636:        }
1.123     thorpej   637:
                    638: #ifdef ALTQ
                    639:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     640:        if (altq_input) {
                    641:                SOFTNET_LOCK();
                    642:                if ((*altq_input)(m, AF_INET) == 0) {
                    643:                        /* Packet dropped by traffic conditioner. */
                    644:                        SOFTNET_UNLOCK();
1.329     ozaki-r   645:                        goto out;
1.318     rmind     646:                }
                    647:                SOFTNET_UNLOCK();
1.123     thorpej   648:        }
                    649: #endif
1.121     thorpej   650:
                    651:        /*
1.1       cgd       652:         * Process options and, if not destined for us,
                    653:         * ship it on.  ip_dooptions returns 1 when an
                    654:         * error was detected (causing an icmp message
                    655:         * to be sent and the original packet to be freed).
                    656:         */
                    657:        ip_nhops = 0;           /* for source routed packets */
                    658:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.329     ozaki-r   659:                goto out;
1.1       cgd       660:
                    661:        /*
                    662:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    663:         *
                    664:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    665:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       666:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       667:         */
1.100     itojun    668:        downmatch = 0;
1.333     ozaki-r   669:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.86      thorpej   670:        if (ia != NULL)
                    671:                goto ours;
1.333     ozaki-r   672:
1.315     christos  673:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   674:                ia = ip_match_our_address_broadcast(ifp, ip);
                    675:                if (ia != NULL)
                    676:                        goto ours;
1.1       cgd       677:        }
1.333     ozaki-r   678:
1.18      mycroft   679:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   680: #ifdef MROUTING
                    681:                extern struct socket *ip_mrouter;
1.10      brezak    682:
1.4       hpeyerl   683:                if (ip_mrouter) {
                    684:                        /*
                    685:                         * If we are acting as a multicast router, all
                    686:                         * incoming multicast packets are passed to the
                    687:                         * kernel-level multicast forwarding function.
                    688:                         * The packet is returned (relatively) intact; if
                    689:                         * ip_mforward() returns a non-zero value, the packet
                    690:                         * must be discarded, else it may be accepted below.
                    691:                         *
                    692:                         * (The IP ident field is put in the same byte order
                    693:                         * as expected when ip_mforward() is called from
                    694:                         * ip_output().)
                    695:                         */
1.318     rmind     696:                        SOFTNET_LOCK();
1.314     rmind     697:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     698:                                SOFTNET_UNLOCK();
1.266     thorpej   699:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   700:                                goto out;
1.4       hpeyerl   701:                        }
1.318     rmind     702:                        SOFTNET_UNLOCK();
1.4       hpeyerl   703:
                    704:                        /*
                    705:                         * The process-level routing demon needs to receive
                    706:                         * all multicast IGMP packets, whether or not this
                    707:                         * host belongs to their destination groups.
                    708:                         */
1.318     rmind     709:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   710:                                goto ours;
1.318     rmind     711:                        }
1.266     thorpej   712:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   713:                }
                    714: #endif
                    715:                /*
                    716:                 * See if we belong to the destination multicast group on the
                    717:                 * arrival interface.
                    718:                 */
1.316     rmind     719:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   720:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   721:                        goto out;
1.4       hpeyerl   722:                }
                    723:                goto ours;
                    724:        }
1.19      mycroft   725:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   726:            in_nullhost(ip->ip_dst))
1.1       cgd       727:                goto ours;
                    728:
                    729:        /*
                    730:         * Not for us; forward if possible and desirable.
                    731:         */
                    732:        if (ipforwarding == 0) {
1.329     ozaki-r   733:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   734:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       735:                m_freem(m);
1.100     itojun    736:        } else {
                    737:                /*
                    738:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    739:                 * and there's no IFF_UP interface that matches ip_dst,
                    740:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    741:                 * forwarding loop till TTL goes to 0.
                    742:                 */
                    743:                if (downmatch) {
1.329     ozaki-r   744:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    745:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   746:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    747:                        return;
                    748:                }
1.304     christos  749: #ifdef IPSEC
1.305     rmind     750:                /* Perform IPsec, if any. */
1.318     rmind     751:                if (ipsec_used) {
                    752:                        SOFTNET_LOCK();
                    753:                        if (ipsec4_input(m, IP_FORWARDING |
                    754:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    755:                                SOFTNET_UNLOCK();
1.332     ozaki-r   756:                                goto out;
1.318     rmind     757:                        }
                    758:                        SOFTNET_UNLOCK();
1.173     jonathan  759:                }
1.305     rmind     760: #endif
1.329     ozaki-r   761:                ip_forward(m, srcrt, ifp);
                    762:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    763:        }
1.89      itojun    764:        return;
1.1       cgd       765:
                    766: ours:
1.329     ozaki-r   767:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   768:        ifp = NULL;
1.329     ozaki-r   769:
1.1       cgd       770:        /*
                    771:         * If offset or IP_MF are set, must reassemble.
                    772:         */
1.155     itojun    773:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     774:                /*
                    775:                 * Pass to IP reassembly mechanism.
                    776:                 */
1.290     rmind     777:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     778:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   779:                        goto out;
1.16      cgd       780:                }
1.290     rmind     781:                if (m == NULL) {
1.289     rmind     782:                        /* More fragments should come; silently return. */
1.332     ozaki-r   783:                        goto out;
1.289     rmind     784:                }
1.290     rmind     785:                /*
                    786:                 * Reassembly is done, we have the final packet.
                    787:                 * Updated cached data in local variable(s).
                    788:                 */
1.289     rmind     789:                ip = mtod(m, struct ip *);
                    790:                hlen = ip->ip_hl << 2;
1.79      mycroft   791:        }
1.128     itojun    792:
1.304     christos  793: #ifdef IPSEC
1.173     jonathan  794:        /*
1.305     rmind     795:         * Enforce IPsec policy checking if we are seeing last header.
                    796:         * Note that we do not visit this with protocols with PCB layer
                    797:         * code - like UDP/TCP/raw IP.
1.173     jonathan  798:         */
1.317     christos  799:        if (ipsec_used &&
1.328     riastrad  800:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     801:                SOFTNET_LOCK();
1.305     rmind     802:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     803:                        SOFTNET_UNLOCK();
1.332     ozaki-r   804:                        goto out;
1.173     jonathan  805:                }
1.318     rmind     806:                SOFTNET_UNLOCK();
1.173     jonathan  807:        }
1.305     rmind     808: #endif
1.1       cgd       809:
                    810:        /*
                    811:         * Switch out to protocol's input routine.
                    812:         */
1.82      aidan     813: #if IFA_STATS
1.122     itojun    814:        if (ia && ip)
1.155     itojun    815:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     816: #endif
1.266     thorpej   817:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    818:
1.318     rmind     819:        const int off = hlen, nh = ip->ip_p;
                    820:
                    821:        SOFTNET_LOCK();
1.328     riastrad  822:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     823:        SOFTNET_UNLOCK();
1.89      itojun    824:        return;
1.135     thorpej   825:
1.329     ozaki-r   826: out:
                    827:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   828:        if (m != NULL)
                    829:                m_freem(m);
1.1       cgd       830: }
                    831:
                    832: /*
1.288     rmind     833:  * IP timer processing.
1.1       cgd       834:  */
1.8       mycroft   835: void
1.211     perry     836: ip_slowtimo(void)
1.1       cgd       837: {
1.268     ad        838:
                    839:        mutex_enter(softnet_lock);
                    840:        KERNEL_LOCK(1, NULL);
1.1       cgd       841:
1.288     rmind     842:        ip_reass_slowtimo();
1.268     ad        843:
                    844:        KERNEL_UNLOCK_ONE(NULL);
                    845:        mutex_exit(softnet_lock);
1.1       cgd       846: }
                    847:
                    848: /*
1.288     rmind     849:  * IP drain processing.
1.1       cgd       850:  */
1.8       mycroft   851: void
1.211     perry     852: ip_drain(void)
1.1       cgd       853: {
                    854:
1.268     ad        855:        KERNEL_LOCK(1, NULL);
1.288     rmind     856:        ip_reass_drain();
1.268     ad        857:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       858: }
                    859:
                    860: /*
1.311     rmind     861:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    862:  * it if bad options are encountered, or forwarding it if source-routed.
                    863:  *
                    864:  * => Returns true if packet has been forwarded/freed.
                    865:  * => Returns false if the packet should be processed further.
1.1       cgd       866:  */
1.311     rmind     867: static bool
1.211     perry     868: ip_dooptions(struct mbuf *m)
1.1       cgd       869: {
1.109     augustss  870:        struct ip *ip = mtod(m, struct ip *);
                    871:        u_char *cp, *cp0;
                    872:        struct ip_timestamp *ipt;
                    873:        struct in_ifaddr *ia;
1.1       cgd       874:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   875:        struct in_addr dst;
1.1       cgd       876:        n_time ntime;
                    877:
1.13      mycroft   878:        dst = ip->ip_dst;
1.1       cgd       879:        cp = (u_char *)(ip + 1);
                    880:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    881:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    882:                opt = cp[IPOPT_OPTVAL];
                    883:                if (opt == IPOPT_EOL)
                    884:                        break;
                    885:                if (opt == IPOPT_NOP)
                    886:                        optlen = 1;
                    887:                else {
1.113     itojun    888:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    889:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    890:                                goto bad;
                    891:                        }
1.1       cgd       892:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    893:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       894:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    895:                                goto bad;
                    896:                        }
                    897:                }
                    898:                switch (opt) {
                    899:
                    900:                default:
                    901:                        break;
                    902:
                    903:                /*
                    904:                 * Source routing with record.
                    905:                 * Find interface with current destination address.
                    906:                 * If none on this machine then drop if strictly routed,
                    907:                 * or do nothing if loosely routed.
                    908:                 * Record interface address and bring up next address
                    909:                 * component.  If strictly routed make sure next
                    910:                 * address is on directly accessible net.
                    911:                 */
                    912:                case IPOPT_LSRR:
                    913:                case IPOPT_SSRR:
1.47      cjs       914:                        if (ip_allowsrcrt == 0) {
                    915:                                type = ICMP_UNREACH;
                    916:                                code = ICMP_UNREACH_NET_PROHIB;
                    917:                                goto bad;
                    918:                        }
1.114     itojun    919:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    920:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    921:                                goto bad;
                    922:                        }
1.1       cgd       923:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    924:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    925:                                goto bad;
                    926:                        }
                    927:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   928:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       929:                        if (ia == 0) {
                    930:                                if (opt == IPOPT_SSRR) {
                    931:                                        type = ICMP_UNREACH;
                    932:                                        code = ICMP_UNREACH_SRCFAIL;
                    933:                                        goto bad;
                    934:                                }
                    935:                                /*
                    936:                                 * Loose routing, and not at next destination
                    937:                                 * yet; nothing to do except forward.
                    938:                                 */
                    939:                                break;
                    940:                        }
                    941:                        off--;                  /* 0 origin */
1.112     sommerfe  942:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       943:                                /*
                    944:                                 * End of source route.  Should be for us.
                    945:                                 */
                    946:                                save_rte(cp, ip->ip_src);
                    947:                                break;
                    948:                        }
                    949:                        /*
                    950:                         * locate outgoing interface
                    951:                         */
1.281     tsutsui   952:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       953:                            sizeof(ipaddr.sin_addr));
1.96      thorpej   954:                        if (opt == IPOPT_SSRR)
1.196     itojun    955:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej   956:                        else
1.1       cgd       957:                                ia = ip_rtaddr(ipaddr.sin_addr);
                    958:                        if (ia == 0) {
                    959:                                type = ICMP_UNREACH;
                    960:                                code = ICMP_UNREACH_SRCFAIL;
                    961:                                goto bad;
                    962:                        }
                    963:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos  964:                        bcopy((void *)&ia->ia_addr.sin_addr,
                    965:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd       966:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   967:                        /*
                    968:                         * Let ip_intr's mcast routing check handle mcast pkts
                    969:                         */
1.18      mycroft   970:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       971:                        break;
                    972:
                    973:                case IPOPT_RR:
1.114     itojun    974:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    975:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    976:                                goto bad;
                    977:                        }
1.1       cgd       978:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    979:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    980:                                goto bad;
                    981:                        }
                    982:                        /*
                    983:                         * If no space remains, ignore.
                    984:                         */
                    985:                        off--;                  /* 0 origin */
1.112     sommerfe  986:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd       987:                                break;
1.281     tsutsui   988:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd       989:                            sizeof(ipaddr.sin_addr));
                    990:                        /*
                    991:                         * locate outgoing interface; if we're the destination,
                    992:                         * use the incoming interface (should be same).
                    993:                         */
1.96      thorpej   994:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                    995:                            == NULL &&
                    996:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd       997:                                type = ICMP_UNREACH;
                    998:                                code = ICMP_UNREACH_HOST;
                    999:                                goto bad;
                   1000:                        }
1.244     christos 1001:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1002:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd      1003:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1004:                        break;
                   1005:
                   1006:                case IPOPT_TS:
                   1007:                        code = cp - (u_char *)ip;
                   1008:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1009:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1010:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1011:                                goto bad;
1.114     itojun   1012:                        }
                   1013:                        if (ipt->ipt_ptr < 5) {
                   1014:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1015:                                goto bad;
                   1016:                        }
1.15      cgd      1017:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1018:                                if (++ipt->ipt_oflw == 0) {
                   1019:                                        code = (u_char *)&ipt->ipt_ptr -
                   1020:                                            (u_char *)ip;
1.1       cgd      1021:                                        goto bad;
1.114     itojun   1022:                                }
1.1       cgd      1023:                                break;
                   1024:                        }
1.104     thorpej  1025:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1026:                        switch (ipt->ipt_flg) {
                   1027:
                   1028:                        case IPOPT_TS_TSONLY:
                   1029:                                break;
                   1030:
1.329     ozaki-r  1031:                        case IPOPT_TS_TSANDADDR: {
                   1032:                                struct ifnet *rcvif;
                   1033:                                int s;
                   1034:
1.66      thorpej  1035:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1036:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1037:                                        code = (u_char *)&ipt->ipt_ptr -
                   1038:                                            (u_char *)ip;
1.1       cgd      1039:                                        goto bad;
1.114     itojun   1040:                                }
1.13      mycroft  1041:                                ipaddr.sin_addr = dst;
1.329     ozaki-r  1042:                                rcvif = m_get_rcvif(m, &s);
1.96      thorpej  1043:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1.329     ozaki-r  1044:                                    rcvif));
                   1045:                                m_put_rcvif(rcvif, &s);
1.13      mycroft  1046:                                if (ia == 0)
                   1047:                                        continue;
1.104     thorpej  1048:                                bcopy(&ia->ia_addr.sin_addr,
                   1049:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1050:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1051:                                break;
1.329     ozaki-r  1052:                        }
1.1       cgd      1053:
                   1054:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1055:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1056:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1057:                                        code = (u_char *)&ipt->ipt_ptr -
                   1058:                                            (u_char *)ip;
1.1       cgd      1059:                                        goto bad;
1.114     itojun   1060:                                }
1.281     tsutsui  1061:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1062:                                    sizeof(struct in_addr));
1.96      thorpej  1063:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1064:                                    == NULL)
1.1       cgd      1065:                                        continue;
                   1066:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1067:                                break;
                   1068:
                   1069:                        default:
1.114     itojun   1070:                                /* XXX can't take &ipt->ipt_flg */
                   1071:                                code = (u_char *)&ipt->ipt_ptr -
                   1072:                                    (u_char *)ip + 1;
1.1       cgd      1073:                                goto bad;
                   1074:                        }
                   1075:                        ntime = iptime();
1.107     thorpej  1076:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1077:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1078:                            sizeof(n_time));
                   1079:                        ipt->ipt_ptr += sizeof(n_time);
                   1080:                }
                   1081:        }
                   1082:        if (forward) {
1.329     ozaki-r  1083:                struct ifnet *rcvif;
                   1084:                struct psref psref;
                   1085:
1.26      thorpej  1086:                if (ip_forwsrcrt == 0) {
                   1087:                        type = ICMP_UNREACH;
                   1088:                        code = ICMP_UNREACH_SRCFAIL;
                   1089:                        goto bad;
                   1090:                }
1.329     ozaki-r  1091:
                   1092:                rcvif = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1093:                if (__predict_false(rcvif == NULL)) {
                   1094:                        type = ICMP_UNREACH;
                   1095:                        code = ICMP_UNREACH_HOST;
                   1096:                        goto bad;
                   1097:                }
1.329     ozaki-r  1098:                ip_forward(m, 1, rcvif);
                   1099:                m_put_rcvif_psref(rcvif, &psref);
1.311     rmind    1100:                return true;
1.13      mycroft  1101:        }
1.311     rmind    1102:        return false;
1.1       cgd      1103: bad:
1.13      mycroft  1104:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1105:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1106:        return true;
1.1       cgd      1107: }
                   1108:
                   1109: /*
1.311     rmind    1110:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1111:  * return internet address info of interface to be used to get there.
                   1112:  */
1.311     rmind    1113: static struct in_ifaddr *
1.211     perry    1114: ip_rtaddr(struct in_addr dst)
1.1       cgd      1115: {
1.249     dyoung   1116:        struct rtentry *rt;
                   1117:        union {
                   1118:                struct sockaddr         dst;
                   1119:                struct sockaddr_in      dst4;
                   1120:        } u;
                   1121:
                   1122:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1123:
1.318     rmind    1124:        SOFTNET_LOCK();
                   1125:        rt = rtcache_lookup(&ipforward_rt, &u.dst);
                   1126:        SOFTNET_UNLOCK();
                   1127:        if (rt == NULL)
1.249     dyoung   1128:                return NULL;
                   1129:
                   1130:        return ifatoia(rt->rt_ifa);
1.1       cgd      1131: }
                   1132:
                   1133: /*
1.311     rmind    1134:  * save_rte: save incoming source route for use in replies, to be picked
                   1135:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1136:  */
1.311     rmind    1137: static void
1.211     perry    1138: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1139: {
                   1140:        unsigned olen;
                   1141:
                   1142:        olen = option[IPOPT_OLEN];
                   1143:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1144:                return;
1.281     tsutsui  1145:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1146:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1147:        ip_srcrt.dst = dst;
                   1148: }
                   1149:
                   1150: /*
                   1151:  * Retrieve incoming source route for use in replies,
                   1152:  * in the same form used by setsockopt.
                   1153:  * The first hop is placed before the options, will be removed later.
                   1154:  */
                   1155: struct mbuf *
1.211     perry    1156: ip_srcroute(void)
1.1       cgd      1157: {
1.109     augustss 1158:        struct in_addr *p, *q;
                   1159:        struct mbuf *m;
1.1       cgd      1160:
                   1161:        if (ip_nhops == 0)
1.237     dyoung   1162:                return NULL;
1.1       cgd      1163:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1164:        if (m == 0)
1.237     dyoung   1165:                return NULL;
1.1       cgd      1166:
1.164     matt     1167:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1168: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1169:
                   1170:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1171:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1172:            OPTSIZ;
                   1173:
                   1174:        /*
                   1175:         * First save first hop for return route
                   1176:         */
                   1177:        p = &ip_srcrt.route[ip_nhops - 1];
                   1178:        *(mtod(m, struct in_addr *)) = *p--;
                   1179:
                   1180:        /*
                   1181:         * Copy option fields and padding (nop) to mbuf.
                   1182:         */
                   1183:        ip_srcrt.nop = IPOPT_NOP;
                   1184:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1185:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1186:            OPTSIZ);
                   1187:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1188:            sizeof(struct in_addr) + OPTSIZ);
                   1189: #undef OPTSIZ
                   1190:        /*
                   1191:         * Record return path as an IP source route,
                   1192:         * reversing the path (pointers are now aligned).
                   1193:         */
                   1194:        while (p >= ip_srcrt.route) {
                   1195:                *q++ = *p--;
                   1196:        }
                   1197:        /*
                   1198:         * Last hop goes to final destination.
                   1199:         */
                   1200:        *q = ip_srcrt.dst;
                   1201:        return (m);
                   1202: }
                   1203:
1.139     matt     1204: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1205:        [PRC_MSGSIZE] = EMSGSIZE,
                   1206:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1207:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1208:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1209:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1210:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1211:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1212:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1213:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1214: };
                   1215:
1.295     dyoung   1216: void
                   1217: ip_fasttimo(void)
                   1218: {
                   1219:        if (ip_drainwanted) {
                   1220:                ip_drain();
                   1221:                ip_drainwanted = 0;
                   1222:        }
                   1223: }
                   1224:
                   1225: void
                   1226: ip_drainstub(void)
                   1227: {
                   1228:        ip_drainwanted = 1;
                   1229: }
                   1230:
1.1       cgd      1231: /*
                   1232:  * Forward a packet.  If some error occurs return the sender
                   1233:  * an icmp packet.  Note we can't always generate a meaningful
                   1234:  * icmp message because icmp doesn't have a large enough repertoire
                   1235:  * of codes and types.
                   1236:  *
                   1237:  * If not forwarding, just drop the packet.  This could be confusing
                   1238:  * if ipforwarding was zero but some routing protocol was advancing
                   1239:  * us as a gateway to somewhere.  However, we must let the routing
                   1240:  * protocol deal with that.
                   1241:  *
                   1242:  * The srcrt parameter indicates whether the packet is being forwarded
                   1243:  * via a source route.
                   1244:  */
1.313     rmind    1245: static void
1.329     ozaki-r  1246: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1247: {
1.109     augustss 1248:        struct ip *ip = mtod(m, struct ip *);
                   1249:        struct rtentry *rt;
1.220     christos 1250:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1251:        struct mbuf *mcopy;
1.13      mycroft  1252:        n_long dest;
1.249     dyoung   1253:        union {
                   1254:                struct sockaddr         dst;
                   1255:                struct sockaddr_in      dst4;
                   1256:        } u;
1.320     ozaki-r  1257:        uint64_t *ips;
1.164     matt     1258:
1.318     rmind    1259:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1260:            "interrupt handler; synchronization assumptions violated");
                   1261:
1.164     matt     1262:        /*
                   1263:         * We are now in the output path.
                   1264:         */
                   1265:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1266:
                   1267:        /*
                   1268:         * Clear any in-bound checksum flags for this packet.
                   1269:         */
                   1270:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1271:
1.13      mycroft  1272:        dest = 0;
1.93      sommerfe 1273:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1274:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1275:                m_freem(m);
                   1276:                return;
                   1277:        }
1.318     rmind    1278:
                   1279:        SOFTNET_LOCK();
                   1280:
1.1       cgd      1281:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1282:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318     rmind    1283:                SOFTNET_UNLOCK();
1.1       cgd      1284:                return;
                   1285:        }
                   1286:
1.249     dyoung   1287:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1288:
1.249     dyoung   1289:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1290:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318     rmind    1291:                SOFTNET_UNLOCK();
1.249     dyoung   1292:                return;
1.1       cgd      1293:        }
                   1294:
                   1295:        /*
1.34      mycroft  1296:         * Save at most 68 bytes of the packet in case
1.1       cgd      1297:         * we need to generate an ICMP message to the src.
1.119     itojun   1298:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1299:         */
1.155     itojun   1300:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1301:        if (mcopy)
                   1302:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1303:
1.221     christos 1304:        ip->ip_ttl -= IPTTLDEC;
                   1305:
1.1       cgd      1306:        /*
                   1307:         * If forwarding packet using same interface that it came in on,
                   1308:         * perhaps should send a redirect to sender to shortcut a hop.
                   1309:         * Only send redirect if source is sending directly to us,
                   1310:         * and if packet was not source routed (or has any options).
                   1311:         * Also, don't send redirect if forwarding using a default route
                   1312:         * or a route modified by a redirect.
                   1313:         */
1.329     ozaki-r  1314:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1315:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1316:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1317:            ipsendredirects && !srcrt) {
1.19      mycroft  1318:                if (rt->rt_ifa &&
                   1319:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1320:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1321:                        if (rt->rt_flags & RTF_GATEWAY)
                   1322:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1323:                        else
                   1324:                                dest = ip->ip_dst.s_addr;
                   1325:                        /*
                   1326:                         * Router requirements says to only send host
                   1327:                         * redirects.
                   1328:                         */
                   1329:                        type = ICMP_REDIRECT;
                   1330:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1331:                }
                   1332:        }
                   1333:
1.238     dyoung   1334:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1335:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1336:            NULL, NULL);
1.173     jonathan 1337:
1.320     ozaki-r  1338:        if (error) {
1.266     thorpej  1339:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1340:                goto error;
                   1341:        }
                   1342:
                   1343:        ips = IP_STAT_GETREF();
                   1344:        ips[IP_STAT_FORWARD]++;
                   1345:
                   1346:        if (type) {
                   1347:                ips[IP_STAT_REDIRECTSENT]++;
                   1348:                IP_STAT_PUTREF();
                   1349:                goto redirect;
                   1350:        }
                   1351:
                   1352:        IP_STAT_PUTREF();
                   1353:        if (mcopy) {
1.63      matt     1354: #ifdef GATEWAY
1.320     ozaki-r  1355:                if (mcopy->m_flags & M_CANFASTFWD)
                   1356:                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1357: #endif
1.320     ozaki-r  1358:                m_freem(mcopy);
1.1       cgd      1359:        }
1.320     ozaki-r  1360:
                   1361:        SOFTNET_UNLOCK();
                   1362:        return;
                   1363:
                   1364: redirect:
                   1365: error:
1.318     rmind    1366:        if (mcopy == NULL) {
                   1367:                SOFTNET_UNLOCK();
1.1       cgd      1368:                return;
1.318     rmind    1369:        }
1.13      mycroft  1370:
1.1       cgd      1371:        switch (error) {
                   1372:
                   1373:        case 0:                         /* forwarded, but need redirect */
                   1374:                /* type, code set above */
                   1375:                break;
                   1376:
                   1377:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1378:        case EHOSTUNREACH:
                   1379:        case ENETDOWN:
                   1380:        case EHOSTDOWN:
                   1381:        default:
                   1382:                type = ICMP_UNREACH;
                   1383:                code = ICMP_UNREACH_HOST;
                   1384:                break;
                   1385:
                   1386:        case EMSGSIZE:
                   1387:                type = ICMP_UNREACH;
                   1388:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1389:
1.274     seanb    1390:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
                   1391:                        destmtu = rt->rt_ifp->if_mtu;
1.305     rmind    1392: #ifdef IPSEC
1.317     christos 1393:                if (ipsec_used)
                   1394:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1395: #endif
1.266     thorpej  1396:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1397:                break;
                   1398:
                   1399:        case ENOBUFS:
1.143     itojun   1400:                /*
1.311     rmind    1401:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1402:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1403:                 * big problem under DoS attacks or if the underlying
                   1404:                 * interface is rate-limited.
1.143     itojun   1405:                 */
                   1406:                if (mcopy)
                   1407:                        m_freem(mcopy);
1.318     rmind    1408:                SOFTNET_UNLOCK();
1.143     itojun   1409:                return;
1.1       cgd      1410:        }
1.220     christos 1411:        icmp_error(mcopy, type, code, dest, destmtu);
1.318     rmind    1412:        SOFTNET_UNLOCK();
1.44      thorpej  1413: }
                   1414:
                   1415: void
1.211     perry    1416: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1417:     struct mbuf *m)
1.44      thorpej  1418: {
1.311     rmind    1419:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1420:        ifnet_t *ifp;
1.311     rmind    1421:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1422:        struct psref psref;
1.44      thorpej  1423:
1.329     ozaki-r  1424:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1425:        if (__predict_false(ifp == NULL))
                   1426:                return; /* XXX should report error? */
                   1427:
1.311     rmind    1428:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1429: #ifdef SO_OTIMESTAMP
1.311     rmind    1430:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1431: #endif
                   1432:            ) {
1.44      thorpej  1433:                struct timeval tv;
                   1434:
                   1435:                microtime(&tv);
1.278     christos 1436: #ifdef SO_OTIMESTAMP
1.311     rmind    1437:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1438:                        struct timeval50 tv50;
                   1439:                        timeval_to_timeval50(&tv, &tv50);
                   1440:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1441:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1442:                } else
                   1443: #endif
1.244     christos 1444:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1445:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1446:                if (*mp)
                   1447:                        mp = &(*mp)->m_next;
                   1448:        }
1.311     rmind    1449:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1450:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1451:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1452:                if (*mp)
                   1453:                        mp = &(*mp)->m_next;
                   1454:        }
1.311     rmind    1455:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1456:                struct in_pktinfo ipi;
1.307     christos 1457:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1458:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1459:                *mp = sbcreatecontrol((void *) &ipi,
                   1460:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1461:                if (*mp)
                   1462:                        mp = &(*mp)->m_next;
                   1463:        }
1.311     rmind    1464:        if (inpflags & INP_PKTINFO) {
1.306     christos 1465:                struct in_pktinfo ipi;
1.307     christos 1466:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1467:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1468:                *mp = sbcreatecontrol((void *) &ipi,
                   1469:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1470:                if (*mp)
                   1471:                        mp = &(*mp)->m_next;
                   1472:        }
1.311     rmind    1473:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1474:                struct sockaddr_dl sdl;
                   1475:
1.314     rmind    1476:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp ?
                   1477:                    ifp->if_index : 0, 0, NULL, 0, NULL, 0);
1.251     dyoung   1478:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1479:                if (*mp)
                   1480:                        mp = &(*mp)->m_next;
                   1481:        }
1.311     rmind    1482:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1483:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1484:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1485:                if (*mp)
                   1486:                        mp = &(*mp)->m_next;
                   1487:        }
1.329     ozaki-r  1488:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1489: }
                   1490:
1.189     atatat   1491: /*
1.228     elad     1492:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1493:  */
                   1494: static int
                   1495: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1496: {
                   1497:        int error, tmp;
                   1498:        struct sysctlnode node;
                   1499:
                   1500:        node = *rnode;
                   1501:        tmp = ip_forwsrcrt;
                   1502:        node.sysctl_data = &tmp;
                   1503:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1504:        if (error || newp == NULL)
                   1505:                return (error);
                   1506:
1.280     elad     1507:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1508:            0, NULL, NULL, NULL);
                   1509:        if (error)
                   1510:                return (error);
1.228     elad     1511:
                   1512:        ip_forwsrcrt = tmp;
                   1513:
                   1514:        return (0);
                   1515: }
                   1516:
                   1517: /*
1.189     atatat   1518:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1519:  * range of the new value and tweaks timers if it changes.
                   1520:  */
                   1521: static int
                   1522: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1523: {
1.189     atatat   1524:        int error, tmp;
                   1525:        struct sysctlnode node;
                   1526:
                   1527:        node = *rnode;
                   1528:        tmp = ip_mtudisc_timeout;
                   1529:        node.sysctl_data = &tmp;
                   1530:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1531:        if (error || newp == NULL)
                   1532:                return (error);
                   1533:        if (tmp < 0)
                   1534:                return (EINVAL);
1.52      thorpej  1535:
1.273     matt     1536:        mutex_enter(softnet_lock);
                   1537:
1.189     atatat   1538:        ip_mtudisc_timeout = tmp;
                   1539:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1540:
1.273     matt     1541:        mutex_exit(softnet_lock);
                   1542:
1.189     atatat   1543:        return (0);
                   1544: }
1.54      lukem    1545:
1.266     thorpej  1546: static int
                   1547: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1548: {
                   1549:
1.271     thorpej  1550:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1551: }
1.131     itojun   1552:
1.284     pooka    1553: static void
                   1554: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1555: {
1.197     atatat   1556:        sysctl_createv(clog, 0, NULL, NULL,
                   1557:                       CTLFLAG_PERMANENT,
1.203     atatat   1558:                       CTLTYPE_NODE, "inet",
                   1559:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1560:                       NULL, 0, NULL, 0,
                   1561:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1562:        sysctl_createv(clog, 0, NULL, NULL,
                   1563:                       CTLFLAG_PERMANENT,
1.203     atatat   1564:                       CTLTYPE_NODE, "ip",
                   1565:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1566:                       NULL, 0, NULL, 0,
                   1567:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1568:
1.197     atatat   1569:        sysctl_createv(clog, 0, NULL, NULL,
                   1570:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1571:                       CTLTYPE_INT, "forwarding",
                   1572:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1573:                       NULL, 0, &ipforwarding, 0,
                   1574:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1575:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1576:        sysctl_createv(clog, 0, NULL, NULL,
                   1577:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1578:                       CTLTYPE_INT, "redirect",
                   1579:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1580:                       NULL, 0, &ipsendredirects, 0,
                   1581:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1582:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1583:        sysctl_createv(clog, 0, NULL, NULL,
                   1584:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1585:                       CTLTYPE_INT, "ttl",
                   1586:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1587:                       NULL, 0, &ip_defttl, 0,
                   1588:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1589:                       IPCTL_DEFTTL, CTL_EOL);
                   1590: #ifdef IPCTL_DEFMTU
1.197     atatat   1591:        sysctl_createv(clog, 0, NULL, NULL,
                   1592:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1593:                       CTLTYPE_INT, "mtu",
                   1594:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1595:                       NULL, 0, &ip_mtu, 0,
                   1596:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1597:                       IPCTL_DEFMTU, CTL_EOL);
                   1598: #endif /* IPCTL_DEFMTU */
1.197     atatat   1599:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1600:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1601:                       CTLTYPE_INT, "forwsrcrt",
                   1602:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1603:                                    "datagrams"),
1.228     elad     1604:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1605:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1606:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1607:        sysctl_createv(clog, 0, NULL, NULL,
                   1608:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1609:                       CTLTYPE_INT, "directed-broadcast",
                   1610:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1611:                       NULL, 0, &ip_directedbcast, 0,
                   1612:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1613:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1614:        sysctl_createv(clog, 0, NULL, NULL,
                   1615:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1616:                       CTLTYPE_INT, "allowsrcrt",
                   1617:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1618:                       NULL, 0, &ip_allowsrcrt, 0,
                   1619:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1620:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1621:
1.197     atatat   1622:        sysctl_createv(clog, 0, NULL, NULL,
                   1623:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1624:                       CTLTYPE_INT, "mtudisc",
                   1625:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1626:                       NULL, 0, &ip_mtudisc, 0,
                   1627:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1628:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1629:        sysctl_createv(clog, 0, NULL, NULL,
                   1630:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1631:                       CTLTYPE_INT, "anonportmin",
                   1632:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1633:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1634:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1635:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1636:        sysctl_createv(clog, 0, NULL, NULL,
                   1637:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1638:                       CTLTYPE_INT, "anonportmax",
                   1639:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1640:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1641:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1642:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1645:                       CTLTYPE_INT, "mtudisctimeout",
                   1646:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1647:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1648:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1649:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1650: #ifndef IPNOPRIVPORTS
1.197     atatat   1651:        sysctl_createv(clog, 0, NULL, NULL,
                   1652:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1653:                       CTLTYPE_INT, "lowportmin",
                   1654:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1655:                                    "to assign"),
1.189     atatat   1656:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1657:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1658:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1659:        sysctl_createv(clog, 0, NULL, NULL,
                   1660:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1661:                       CTLTYPE_INT, "lowportmax",
                   1662:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1663:                                    "to assign"),
1.189     atatat   1664:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1665:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1666:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1667: #endif /* IPNOPRIVPORTS */
                   1668: #if NGRE > 0
1.197     atatat   1669:        sysctl_createv(clog, 0, NULL, NULL,
                   1670:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1671:                       CTLTYPE_INT, "grettl",
                   1672:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1673:                       NULL, 0, &ip_gre_ttl, 0,
                   1674:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1675:                       IPCTL_GRE_TTL, CTL_EOL);
                   1676: #endif /* NGRE */
1.197     atatat   1677:        sysctl_createv(clog, 0, NULL, NULL,
                   1678:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1679:                       CTLTYPE_INT, "checkinterface",
                   1680:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1681:                                    "from RFC1122"),
1.189     atatat   1682:                       NULL, 0, &ip_checkinterface, 0,
                   1683:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1684:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1685:        sysctl_createv(clog, 0, NULL, NULL,
                   1686:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1687:                       CTLTYPE_INT, "random_id",
                   1688:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1689:                       NULL, 0, &ip_do_randomid, 0,
                   1690:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1691:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1692:        sysctl_createv(clog, 0, NULL, NULL,
                   1693:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1694:                       CTLTYPE_INT, "do_loopback_cksum",
                   1695:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1696:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1697:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1698:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1699:        sysctl_createv(clog, 0, NULL, NULL,
                   1700:                       CTLFLAG_PERMANENT,
                   1701:                       CTLTYPE_STRUCT, "stats",
                   1702:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1703:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1704:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1705:                       CTL_EOL);
1.322     joerg    1706: #if NARP
1.321     roy      1707:        sysctl_createv(clog, 0, NULL, NULL,
                   1708:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1709:                       CTLTYPE_INT, "dad_count",
                   1710:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1711:                                    "probes to send"),
                   1712:                       NULL, 0, &ip_dad_count, 0,
                   1713:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1714:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1715: #endif
1.301     christos 1716:
                   1717:        /* anonportalgo RFC6056 subtree */
1.302     christos 1718:        const struct sysctlnode *portalgo_node;
                   1719:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1720:                       CTLFLAG_PERMANENT,
                   1721:                       CTLTYPE_NODE, "anonportalgo",
                   1722:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1723:                       NULL, 0, NULL, 0,
                   1724:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1725:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1726:                       CTLFLAG_PERMANENT,
                   1727:                       CTLTYPE_STRING, "available",
                   1728:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1729:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1730:                       CTL_CREATE, CTL_EOL);
1.302     christos 1731:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1732:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1733:                       CTLTYPE_STRING, "selected",
                   1734:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1735:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1736:                       CTL_CREATE, CTL_EOL);
                   1737:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1739:                       CTLTYPE_STRUCT, "reserve",
                   1740:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1741:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1742:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1743: }
1.266     thorpej  1744:
                   1745: void
                   1746: ip_statinc(u_int stat)
                   1747: {
                   1748:
                   1749:        KASSERT(stat < IP_NSTATS);
                   1750:        IP_STATINC(stat);
                   1751: }

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