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Annotation of src/sys/netinet/ip_input.c, Revision 1.352

1.352   ! ozaki-r     1: /*     $NetBSD: ip_input.c,v 1.351 2017/02/17 18:09:25 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>
1.352   ! ozaki-r    94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.351 2017/02/17 18:09:25 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"
1.344     ozaki-r   104: #include "opt_net_mpsafe.h"
1.324     pooka     105: #endif
1.1       cgd       106:
1.325     roy       107: #include "arp.h"
                    108:
1.5       mycroft   109: #include <sys/param.h>
                    110: #include <sys/systm.h>
1.318     rmind     111: #include <sys/cpu.h>
1.5       mycroft   112: #include <sys/mbuf.h>
                    113: #include <sys/domain.h>
                    114: #include <sys/protosw.h>
                    115: #include <sys/socket.h>
1.44      thorpej   116: #include <sys/socketvar.h>
1.5       mycroft   117: #include <sys/errno.h>
                    118: #include <sys/time.h>
                    119: #include <sys/kernel.h>
1.72      thorpej   120: #include <sys/pool.h>
1.28      christos  121: #include <sys/sysctl.h>
1.230     elad      122: #include <sys/kauth.h>
1.1       cgd       123:
1.5       mycroft   124: #include <net/if.h>
1.44      thorpej   125: #include <net/if_dl.h>
1.5       mycroft   126: #include <net/route.h>
1.318     rmind     127: #include <net/pktqueue.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
1.215     yamt      134: #include <netinet/in_proto.h>
1.5       mycroft   135: #include <netinet/in_var.h>
                    136: #include <netinet/ip_var.h>
1.266     thorpej   137: #include <netinet/ip_private.h>
1.5       mycroft   138: #include <netinet/ip_icmp.h>
1.89      itojun    139: /* just for gif_ttl */
                    140: #include <netinet/in_gif.h>
                    141: #include "gif.h"
1.144     martin    142: #include <net/if_gre.h>
                    143: #include "gre.h"
1.111     jdolecek  144:
                    145: #ifdef MROUTING
                    146: #include <netinet/ip_mroute.h>
                    147: #endif
1.302     christos  148: #include <netinet/portalgo.h>
1.89      itojun    149:
1.304     christos  150: #ifdef IPSEC
1.173     jonathan  151: #include <netipsec/ipsec.h>
1.305     rmind     152: #endif
1.44      thorpej   153:
1.1       cgd       154: #ifndef        IPFORWARDING
                    155: #ifdef GATEWAY
                    156: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    157: #else /* GATEWAY */
                    158: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    159: #endif /* GATEWAY */
                    160: #endif /* IPFORWARDING */
                    161: #ifndef        IPSENDREDIRECTS
                    162: #define        IPSENDREDIRECTS 1
                    163: #endif
1.26      thorpej   164: #ifndef IPFORWSRCRT
1.47      cjs       165: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    166: #endif
                    167: #ifndef IPALLOWSRCRT
1.48      mrg       168: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   169: #endif
1.53      kml       170: #ifndef IPMTUDISC
1.153     itojun    171: #define IPMTUDISC      1
1.53      kml       172: #endif
1.60      kml       173: #ifndef IPMTUDISCTIMEOUT
1.61      kml       174: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       175: #endif
1.53      kml       176:
1.278     christos  177: #ifdef COMPAT_50
                    178: #include <compat/sys/time.h>
                    179: #include <compat/sys/socket.h>
                    180: #endif
                    181:
1.27      thorpej   182: /*
                    183:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    184:  * configuration using this option will Just Work.
                    185:  */
                    186: #ifndef IPDIRECTEDBCAST
                    187: #ifdef DIRECTED_BROADCAST
                    188: #define IPDIRECTEDBCAST        1
                    189: #else
                    190: #define        IPDIRECTEDBCAST 0
                    191: #endif /* DIRECTED_BROADCAST */
                    192: #endif /* IPDIRECTEDBCAST */
1.1       cgd       193: int    ipforwarding = IPFORWARDING;
                    194: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   195: int    ip_defttl = IPDEFTTL;
1.26      thorpej   196: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   197: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       198: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       199: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    200: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       201: #ifdef DIAGNOSTIC
                    202: int    ipprintfs = 0;
                    203: #endif
1.184     jonathan  204:
                    205: int    ip_do_randomid = 0;
                    206:
1.165     christos  207: /*
                    208:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    209:  * the Strong ES model described in RFC 1122, but since the routing table
                    210:  * and transmit implementation do not implement the Strong ES model,
                    211:  * setting this to 1 results in an odd hybrid.
                    212:  *
                    213:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    214:  * to translate the destination address to another local interface.
                    215:  *
                    216:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    217:  * to the loopback interface instead of the interface where the
                    218:  * packets for those addresses are received.
                    219:  */
1.318     rmind     220: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  221:
1.60      kml       222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    223:
1.318     rmind     224: pktqueue_t *           ip_pktq                 __read_mostly;
                    225: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    226: ipid_state_t *         ip_ids                  __read_mostly;
                    227: percpu_t *             ipstat_percpu           __read_mostly;
                    228:
1.340     ozaki-r   229: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       230:
1.183     jonathan  231: uint16_t ip_id;
1.75      thorpej   232:
1.135     thorpej   233: #ifdef INET_CSUM_COUNTERS
                    234: #include <sys/device.h>
                    235:
                    236: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    237:     NULL, "inet", "hwcsum bad");
                    238: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    239:     NULL, "inet", "hwcsum ok");
                    240: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    241:     NULL, "inet", "swcsum");
                    242:
                    243: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    244:
1.201     matt      245: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    246: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    247: EVCNT_ATTACH_STATIC(ip_swcsum);
                    248:
1.135     thorpej   249: #else
                    250:
                    251: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    252:
                    253: #endif /* INET_CSUM_COUNTERS */
                    254:
1.1       cgd       255: /*
                    256:  * We need to save the IP options in case a protocol wants to respond
                    257:  * to an incoming packet over the same route if the packet got here
                    258:  * using IP source routing.  This allows connection establishment and
                    259:  * maintenance when the remote end is on a network that is not known
                    260:  * to us.
                    261:  */
1.311     rmind     262:
                    263: static int     ip_nhops = 0;
                    264:
1.1       cgd       265: static struct ip_srcrt {
                    266:        struct  in_addr dst;                    /* final destination */
                    267:        char    nop;                            /* one NOP to align */
                    268:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    269:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    270: } ip_srcrt;
                    271:
1.295     dyoung    272: static int ip_drainwanted;
                    273:
1.318     rmind     274: struct sockaddr_in ipaddr = {
                    275:        .sin_len = sizeof(ipaddr),
                    276:        .sin_family = AF_INET,
                    277: };
                    278:
1.210     perry     279: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   280:
1.164     matt      281: #ifdef MBUFTRACE
1.234     dogcow    282: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    283: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      284: #endif
                    285:
1.318     rmind     286: static void            ipintr(void *);
1.312     rmind     287: static void            ip_input(struct mbuf *);
1.329     ozaki-r   288: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     289: static bool            ip_dooptions(struct mbuf *);
1.346     ozaki-r   290: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     291: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     292:
1.333     ozaki-r   293: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    294:                            int *);
                    295: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    296:                            struct ip *);
                    297:
1.344     ozaki-r   298: #ifdef NET_MPSAFE
                    299: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    300: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    301: #else
1.318     rmind     302: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    303: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.344     ozaki-r   304: #endif
1.318     rmind     305:
1.1       cgd       306: /*
                    307:  * IP initialization: fill in IP protocol switch table.
                    308:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    309:  */
1.8       mycroft   310: void
1.211     perry     311: ip_init(void)
1.1       cgd       312: {
1.199     matt      313:        const struct protosw *pr;
1.1       cgd       314:
1.311     rmind     315:        in_init();
1.284     pooka     316:        sysctl_net_inet_ip_setup(NULL);
                    317:
1.311     rmind     318:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    319:        KASSERT(pr != NULL);
1.275     pooka     320:
1.319     ozaki-r   321:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     322:        KASSERT(ip_pktq != NULL);
                    323:
1.328     riastrad  324:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    325:                ip_protox[i] = pr - inetsw;
1.311     rmind     326:        }
1.328     riastrad  327:        for (pr = inetdomain.dom_protosw;
                    328:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       329:                if (pr->pr_domain->dom_family == PF_INET &&
                    330:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  331:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  332:
1.288     rmind     333:        ip_reass_init();
1.190     jonathan  334:
1.291     rmind     335:        ip_ids = ip_id_init();
1.323     ozaki-r   336:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  337:
1.73      thorpej   338: #ifdef GATEWAY
1.311     rmind     339:        ipflow_init();
1.73      thorpej   340: #endif
1.121     thorpej   341:
                    342:        /* Register our Packet Filter hook. */
1.308     rmind     343:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    344:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   345:
1.164     matt      346: #ifdef MBUFTRACE
                    347:        MOWNER_ATTACH(&ip_tx_mowner);
                    348:        MOWNER_ATTACH(&ip_rx_mowner);
                    349: #endif /* MBUFTRACE */
1.266     thorpej   350:
                    351:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340     ozaki-r   352:
                    353:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
                    354:        if (ipforward_rt_percpu == NULL)
                    355:                panic("failed to allocate ipforward_rt_percpu");
1.352   ! ozaki-r   356:
        !           357:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       358: }
                    359:
1.333     ozaki-r   360: static struct in_ifaddr *
                    361: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    362: {
                    363:        struct in_ifaddr *ia = NULL;
                    364:        int checkif;
                    365:
                    366:        /*
                    367:         * Enable a consistency check between the destination address
                    368:         * and the arrival interface for a unicast packet (the RFC 1122
                    369:         * strong ES model) if IP forwarding is disabled and the packet
                    370:         * is not locally generated.
                    371:         *
                    372:         * XXX - Checking also should be disabled if the destination
                    373:         * address is ipnat'ed to a different interface.
                    374:         *
                    375:         * XXX - Checking is incompatible with IP aliases added
                    376:         * to the loopback interface instead of the interface where
                    377:         * the packets are received.
                    378:         *
                    379:         * XXX - We need to add a per ifaddr flag for this so that
                    380:         * we get finer grain control.
                    381:         */
                    382:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    383:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    384:
1.334     ozaki-r   385:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   386:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    387:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    388:                                continue;
                    389:                        if (checkif && ia->ia_ifp != ifp)
                    390:                                continue;
1.341     roy       391:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
                    392:                            (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333     ozaki-r   393:                                break;
                    394:                        else
1.338     ozaki-r   395:                                (*downmatch)++;
1.333     ozaki-r   396:                }
                    397:        }
                    398:
                    399:        return ia;
                    400: }
                    401:
                    402: static struct in_ifaddr *
                    403: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    404: {
                    405:        struct in_ifaddr *ia = NULL;
                    406:        struct ifaddr *ifa;
                    407:
1.336     ozaki-r   408:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   409:                if (ifa->ifa_addr->sa_family != AF_INET)
                    410:                        continue;
                    411:                ia = ifatoia(ifa);
1.341     roy       412:                if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333     ozaki-r   413:                        continue;
                    414:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    415:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    416:                    /*
                    417:                     * Look for all-0's host part (old broadcast addr),
                    418:                     * either for subnet or net.
                    419:                     */
                    420:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    421:                    ip->ip_dst.s_addr == ia->ia_net)
                    422:                        goto matched;
                    423:                /*
                    424:                 * An interface with IP address zero accepts
                    425:                 * all packets that arrive on that interface.
                    426:                 */
                    427:                if (in_nullhost(ia->ia_addr.sin_addr))
                    428:                        goto matched;
                    429:        }
                    430:        ia = NULL;
                    431:
                    432: matched:
                    433:        return ia;
                    434: }
                    435:
1.1       cgd       436: /*
1.318     rmind     437:  * IP software interrupt routine.
1.89      itojun    438:  */
1.318     rmind     439: static void
                    440: ipintr(void *arg __unused)
1.89      itojun    441: {
                    442:        struct mbuf *m;
1.286     tls       443:
1.318     rmind     444:        KASSERT(cpu_softintr_p());
1.89      itojun    445:
1.344     ozaki-r   446: #ifndef NET_MPSAFE
1.268     ad        447:        mutex_enter(softnet_lock);
1.344     ozaki-r   448: #endif
1.318     rmind     449:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    450:                ip_input(m);
                    451:        }
1.344     ozaki-r   452: #ifndef NET_MPSAFE
1.268     ad        453:        mutex_exit(softnet_lock);
1.344     ozaki-r   454: #endif
1.89      itojun    455: }
                    456:
                    457: /*
1.318     rmind     458:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       459:  * try to reassemble.  Process options.  Pass to next level.
                    460:  */
1.312     rmind     461: static void
1.89      itojun    462: ip_input(struct mbuf *m)
1.1       cgd       463: {
1.109     augustss  464:        struct ip *ip = NULL;
1.339     ozaki-r   465:        struct in_ifaddr *ia = NULL;
1.288     rmind     466:        int hlen = 0, len;
1.100     itojun    467:        int downmatch;
1.169     itojun    468:        int srcrt = 0;
1.314     rmind     469:        ifnet_t *ifp;
1.329     ozaki-r   470:        struct psref psref;
1.339     ozaki-r   471:        int s;
1.1       cgd       472:
1.318     rmind     473:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    474:            "interrupt handler; synchronization assumptions violated");
                    475:
1.164     matt      476:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     477:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   478:
                    479:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   480:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   481:                goto out;
1.164     matt      482:
1.1       cgd       483:        /*
                    484:         * If no IP addresses have been set yet but the interfaces
                    485:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     486:         * Note: we pre-check without locks held.
1.1       cgd       487:         */
1.335     ozaki-r   488:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   489:                goto out;
1.266     thorpej   490:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     491:
1.154     thorpej   492:        /*
                    493:         * If the IP header is not aligned, slurp it up into a new
                    494:         * mbuf with space for link headers, in the event we forward
                    495:         * it.  Otherwise, if it is aligned, make sure the entire
                    496:         * base IP header is in the first mbuf of the chain.
                    497:         */
1.244     christos  498:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   499:                if ((m = m_copyup(m, sizeof(struct ip),
                    500:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    501:                        /* XXXJRT new stat, please */
1.266     thorpej   502:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   503:                        goto out;
1.154     thorpej   504:                }
                    505:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    506:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   507:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   508:                        goto out;
1.154     thorpej   509:                }
1.1       cgd       510:        }
                    511:        ip = mtod(m, struct ip *);
1.13      mycroft   512:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   513:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   514:                goto out;
1.13      mycroft   515:        }
1.1       cgd       516:        hlen = ip->ip_hl << 2;
                    517:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   518:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   519:                goto out;
1.1       cgd       520:        }
                    521:        if (hlen > m->m_len) {
1.298     liamjfoy  522:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   523:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   524:                        goto out;
1.1       cgd       525:                }
                    526:                ip = mtod(m, struct ip *);
                    527:        }
1.98      thorpej   528:
1.85      hwr       529:        /*
1.99      thorpej   530:         * RFC1122: packets with a multicast source address are
1.98      thorpej   531:         * not allowed.
1.85      hwr       532:         */
                    533:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   534:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   535:                goto out;
1.129     itojun    536:        }
                    537:
                    538:        /* 127/8 must not appear on wire - RFC1122 */
                    539:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    540:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     541:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   542:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   543:                        goto out;
1.130     itojun    544:                }
1.85      hwr       545:        }
                    546:
1.135     thorpej   547:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     548:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   549:                 M_CSUM_IPv4_BAD)) {
                    550:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    551:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   552:                IP_STATINC(IP_STAT_BADSUM);
                    553:                goto out;
1.135     thorpej   554:
                    555:        case M_CSUM_IPv4:
                    556:                /* Checksum was okay. */
                    557:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    558:                break;
                    559:
                    560:        default:
1.206     thorpej   561:                /*
                    562:                 * Must compute it ourselves.  Maybe skip checksum on
                    563:                 * loopback interfaces.
                    564:                 */
1.314     rmind     565:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    566:                    ip_do_loopback_cksum)) {
1.206     thorpej   567:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   568:                        if (in_cksum(m, hlen) != 0) {
                    569:                                IP_STATINC(IP_STAT_BADSUM);
                    570:                                goto out;
                    571:                        }
1.206     thorpej   572:                }
1.135     thorpej   573:                break;
1.1       cgd       574:        }
                    575:
1.121     thorpej   576:        /* Retrieve the packet length. */
                    577:        len = ntohs(ip->ip_len);
1.81      proff     578:
                    579:        /*
                    580:         * Check for additional length bogosity
                    581:         */
1.84      proff     582:        if (len < hlen) {
1.266     thorpej   583:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   584:                goto out;
1.81      proff     585:        }
1.1       cgd       586:
                    587:        /*
                    588:         * Check that the amount of data in the buffers
                    589:         * is as at least much as the IP header would have us expect.
                    590:         * Trim mbufs if longer than we expect.
                    591:         * Drop packet if shorter than we expect.
                    592:         */
1.35      mycroft   593:        if (m->m_pkthdr.len < len) {
1.266     thorpej   594:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   595:                goto out;
1.1       cgd       596:        }
1.35      mycroft   597:        if (m->m_pkthdr.len > len) {
1.1       cgd       598:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   599:                        m->m_len = len;
                    600:                        m->m_pkthdr.len = len;
1.1       cgd       601:                } else
1.35      mycroft   602:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       603:        }
                    604:
1.64      thorpej   605:        /*
                    606:         * Assume that we can create a fast-forward IP flow entry
                    607:         * based on this packet.
                    608:         */
                    609:        m->m_flags |= M_CANFASTFWD;
                    610:
1.33      mrg       611:        /*
1.64      thorpej   612:         * Run through list of hooks for input packets.  If there are any
                    613:         * filters which require that additional packets in the flow are
                    614:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    615:         * Note that filters must _never_ set this flag, as another filter
                    616:         * in the list may have previously cleared it.
1.33      mrg       617:         */
1.304     christos  618: #if defined(IPSEC)
1.317     christos  619:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    620: #else
                    621:        if (1)
                    622: #endif
                    623:        {
1.314     rmind     624:                struct in_addr odst = ip->ip_dst;
1.318     rmind     625:                bool freed;
1.169     itojun    626:
1.318     rmind     627:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    628:                if (freed || m == NULL) {
1.343     ozaki-r   629:                        m = NULL;
1.329     ozaki-r   630:                        goto out;
1.318     rmind     631:                }
1.127     itojun    632:                ip = mtod(m, struct ip *);
1.142     darrenr   633:                hlen = ip->ip_hl << 2;
1.318     rmind     634:
1.205     darrenr   635:                /*
                    636:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    637:                 * from generating ICMP redirects for packets that have
                    638:                 * been redirected by a hook back out on to the same LAN that
                    639:                 * they came from and is not an indication that the packet
                    640:                 * is being inffluenced by source routing options.  This
                    641:                 * allows things like
                    642:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    643:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    644:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    645:                 * also requires a "map tlp0 ..." to complete the story.
                    646:                 * One might argue whether or not this kind of network config.
1.212     perry     647:                 * should be supported in this manner...
1.205     darrenr   648:                 */
1.169     itojun    649:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    650:        }
1.123     thorpej   651:
                    652: #ifdef ALTQ
                    653:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     654:        if (altq_input) {
                    655:                SOFTNET_LOCK();
                    656:                if ((*altq_input)(m, AF_INET) == 0) {
                    657:                        /* Packet dropped by traffic conditioner. */
                    658:                        SOFTNET_UNLOCK();
1.343     ozaki-r   659:                        m = NULL;
1.329     ozaki-r   660:                        goto out;
1.318     rmind     661:                }
                    662:                SOFTNET_UNLOCK();
1.123     thorpej   663:        }
                    664: #endif
1.121     thorpej   665:
                    666:        /*
1.1       cgd       667:         * Process options and, if not destined for us,
                    668:         * ship it on.  ip_dooptions returns 1 when an
                    669:         * error was detected (causing an icmp message
                    670:         * to be sent and the original packet to be freed).
                    671:         */
                    672:        ip_nhops = 0;           /* for source routed packets */
1.343     ozaki-r   673:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    674:                m = NULL;
1.329     ozaki-r   675:                goto out;
1.343     ozaki-r   676:        }
1.1       cgd       677:
                    678:        /*
                    679:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    680:         *
                    681:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    682:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       683:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       684:         */
1.100     itojun    685:        downmatch = 0;
1.339     ozaki-r   686:        s = pserialize_read_enter();
1.333     ozaki-r   687:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   688:        if (ia != NULL) {
                    689:                pserialize_read_exit(s);
1.86      thorpej   690:                goto ours;
1.339     ozaki-r   691:        }
1.333     ozaki-r   692:
1.315     christos  693:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   694:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   695:                if (ia != NULL) {
                    696:                        pserialize_read_exit(s);
1.333     ozaki-r   697:                        goto ours;
1.339     ozaki-r   698:                }
1.1       cgd       699:        }
1.339     ozaki-r   700:        pserialize_read_exit(s);
1.333     ozaki-r   701:
1.18      mycroft   702:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   703: #ifdef MROUTING
                    704:                extern struct socket *ip_mrouter;
1.10      brezak    705:
1.4       hpeyerl   706:                if (ip_mrouter) {
                    707:                        /*
                    708:                         * If we are acting as a multicast router, all
                    709:                         * incoming multicast packets are passed to the
                    710:                         * kernel-level multicast forwarding function.
                    711:                         * The packet is returned (relatively) intact; if
                    712:                         * ip_mforward() returns a non-zero value, the packet
                    713:                         * must be discarded, else it may be accepted below.
                    714:                         *
                    715:                         * (The IP ident field is put in the same byte order
                    716:                         * as expected when ip_mforward() is called from
                    717:                         * ip_output().)
                    718:                         */
1.318     rmind     719:                        SOFTNET_LOCK();
1.314     rmind     720:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     721:                                SOFTNET_UNLOCK();
1.266     thorpej   722:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   723:                                goto out;
1.4       hpeyerl   724:                        }
1.318     rmind     725:                        SOFTNET_UNLOCK();
1.4       hpeyerl   726:
                    727:                        /*
                    728:                         * The process-level routing demon needs to receive
                    729:                         * all multicast IGMP packets, whether or not this
                    730:                         * host belongs to their destination groups.
                    731:                         */
1.318     rmind     732:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   733:                                goto ours;
1.318     rmind     734:                        }
1.266     thorpej   735:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   736:                }
                    737: #endif
                    738:                /*
                    739:                 * See if we belong to the destination multicast group on the
                    740:                 * arrival interface.
                    741:                 */
1.316     rmind     742:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   743:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   744:                        goto out;
1.4       hpeyerl   745:                }
                    746:                goto ours;
                    747:        }
1.19      mycroft   748:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   749:            in_nullhost(ip->ip_dst))
1.1       cgd       750:                goto ours;
                    751:
                    752:        /*
                    753:         * Not for us; forward if possible and desirable.
                    754:         */
                    755:        if (ipforwarding == 0) {
1.329     ozaki-r   756:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   757:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       758:                m_freem(m);
1.100     itojun    759:        } else {
                    760:                /*
                    761:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    762:                 * and there's no IFF_UP interface that matches ip_dst,
                    763:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    764:                 * forwarding loop till TTL goes to 0.
                    765:                 */
                    766:                if (downmatch) {
1.329     ozaki-r   767:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    768:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   769:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    770:                        return;
                    771:                }
1.304     christos  772: #ifdef IPSEC
1.305     rmind     773:                /* Perform IPsec, if any. */
1.318     rmind     774:                if (ipsec_used) {
                    775:                        SOFTNET_LOCK();
                    776:                        if (ipsec4_input(m, IP_FORWARDING |
                    777:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    778:                                SOFTNET_UNLOCK();
1.332     ozaki-r   779:                                goto out;
1.318     rmind     780:                        }
                    781:                        SOFTNET_UNLOCK();
1.173     jonathan  782:                }
1.305     rmind     783: #endif
1.329     ozaki-r   784:                ip_forward(m, srcrt, ifp);
                    785:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    786:        }
1.89      itojun    787:        return;
1.1       cgd       788:
                    789: ours:
1.329     ozaki-r   790:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   791:        ifp = NULL;
1.329     ozaki-r   792:
1.1       cgd       793:        /*
                    794:         * If offset or IP_MF are set, must reassemble.
                    795:         */
1.155     itojun    796:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     797:                /*
                    798:                 * Pass to IP reassembly mechanism.
                    799:                 */
1.290     rmind     800:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     801:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   802:                        goto out;
1.16      cgd       803:                }
1.290     rmind     804:                if (m == NULL) {
1.289     rmind     805:                        /* More fragments should come; silently return. */
1.332     ozaki-r   806:                        goto out;
1.289     rmind     807:                }
1.290     rmind     808:                /*
                    809:                 * Reassembly is done, we have the final packet.
                    810:                 * Updated cached data in local variable(s).
                    811:                 */
1.289     rmind     812:                ip = mtod(m, struct ip *);
                    813:                hlen = ip->ip_hl << 2;
1.79      mycroft   814:        }
1.128     itojun    815:
1.304     christos  816: #ifdef IPSEC
1.173     jonathan  817:        /*
1.305     rmind     818:         * Enforce IPsec policy checking if we are seeing last header.
                    819:         * Note that we do not visit this with protocols with PCB layer
                    820:         * code - like UDP/TCP/raw IP.
1.173     jonathan  821:         */
1.317     christos  822:        if (ipsec_used &&
1.328     riastrad  823:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     824:                SOFTNET_LOCK();
1.305     rmind     825:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     826:                        SOFTNET_UNLOCK();
1.332     ozaki-r   827:                        goto out;
1.173     jonathan  828:                }
1.318     rmind     829:                SOFTNET_UNLOCK();
1.173     jonathan  830:        }
1.305     rmind     831: #endif
1.1       cgd       832:
                    833:        /*
                    834:         * Switch out to protocol's input routine.
                    835:         */
1.82      aidan     836: #if IFA_STATS
1.339     ozaki-r   837:        if (ia && ip) {
                    838:                struct in_ifaddr *_ia;
                    839:                /*
                    840:                 * Keep a reference from ip_match_our_address with psref
                    841:                 * is expensive, so explore ia here again.
                    842:                 */
                    843:                s = pserialize_read_enter();
1.342     ozaki-r   844:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   845:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    846:                pserialize_read_exit(s);
                    847:        }
1.82      aidan     848: #endif
1.266     thorpej   849:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    850:
1.318     rmind     851:        const int off = hlen, nh = ip->ip_p;
                    852:
                    853:        SOFTNET_LOCK();
1.328     riastrad  854:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     855:        SOFTNET_UNLOCK();
1.89      itojun    856:        return;
1.135     thorpej   857:
1.329     ozaki-r   858: out:
                    859:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   860:        if (m != NULL)
                    861:                m_freem(m);
1.1       cgd       862: }
                    863:
                    864: /*
1.288     rmind     865:  * IP timer processing.
1.1       cgd       866:  */
1.8       mycroft   867: void
1.211     perry     868: ip_slowtimo(void)
1.1       cgd       869: {
1.268     ad        870:
1.348     ozaki-r   871: #ifndef NET_MPSAFE
1.268     ad        872:        mutex_enter(softnet_lock);
                    873:        KERNEL_LOCK(1, NULL);
1.348     ozaki-r   874: #endif
1.1       cgd       875:
1.288     rmind     876:        ip_reass_slowtimo();
1.268     ad        877:
1.348     ozaki-r   878: #ifndef NET_MPSAFE
1.268     ad        879:        KERNEL_UNLOCK_ONE(NULL);
                    880:        mutex_exit(softnet_lock);
1.348     ozaki-r   881: #endif
1.1       cgd       882: }
                    883:
                    884: /*
1.288     rmind     885:  * IP drain processing.
1.1       cgd       886:  */
1.8       mycroft   887: void
1.211     perry     888: ip_drain(void)
1.1       cgd       889: {
                    890:
1.268     ad        891:        KERNEL_LOCK(1, NULL);
1.288     rmind     892:        ip_reass_drain();
1.268     ad        893:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       894: }
                    895:
                    896: /*
1.311     rmind     897:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    898:  * it if bad options are encountered, or forwarding it if source-routed.
                    899:  *
                    900:  * => Returns true if packet has been forwarded/freed.
                    901:  * => Returns false if the packet should be processed further.
1.1       cgd       902:  */
1.311     rmind     903: static bool
1.211     perry     904: ip_dooptions(struct mbuf *m)
1.1       cgd       905: {
1.109     augustss  906:        struct ip *ip = mtod(m, struct ip *);
                    907:        u_char *cp, *cp0;
                    908:        struct ip_timestamp *ipt;
                    909:        struct in_ifaddr *ia;
1.1       cgd       910:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   911:        struct in_addr dst;
1.1       cgd       912:        n_time ntime;
1.349     ozaki-r   913:        struct ifaddr *ifa = NULL;
1.339     ozaki-r   914:        int s;
1.1       cgd       915:
1.13      mycroft   916:        dst = ip->ip_dst;
1.1       cgd       917:        cp = (u_char *)(ip + 1);
                    918:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    919:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    920:                opt = cp[IPOPT_OPTVAL];
                    921:                if (opt == IPOPT_EOL)
                    922:                        break;
                    923:                if (opt == IPOPT_NOP)
                    924:                        optlen = 1;
                    925:                else {
1.113     itojun    926:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    927:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    928:                                goto bad;
                    929:                        }
1.1       cgd       930:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    931:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       932:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    933:                                goto bad;
                    934:                        }
                    935:                }
                    936:                switch (opt) {
                    937:
                    938:                default:
                    939:                        break;
                    940:
                    941:                /*
                    942:                 * Source routing with record.
                    943:                 * Find interface with current destination address.
                    944:                 * If none on this machine then drop if strictly routed,
                    945:                 * or do nothing if loosely routed.
                    946:                 * Record interface address and bring up next address
                    947:                 * component.  If strictly routed make sure next
                    948:                 * address is on directly accessible net.
                    949:                 */
                    950:                case IPOPT_LSRR:
1.346     ozaki-r   951:                case IPOPT_SSRR: {
                    952:                        struct psref psref;
1.47      cjs       953:                        if (ip_allowsrcrt == 0) {
                    954:                                type = ICMP_UNREACH;
                    955:                                code = ICMP_UNREACH_NET_PROHIB;
                    956:                                goto bad;
                    957:                        }
1.114     itojun    958:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    959:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    960:                                goto bad;
                    961:                        }
1.1       cgd       962:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    963:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    964:                                goto bad;
                    965:                        }
                    966:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   967:
                    968:                        s = pserialize_read_enter();
                    969:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    970:                        if (ifa == NULL) {
                    971:                                pserialize_read_exit(s);
1.1       cgd       972:                                if (opt == IPOPT_SSRR) {
                    973:                                        type = ICMP_UNREACH;
                    974:                                        code = ICMP_UNREACH_SRCFAIL;
                    975:                                        goto bad;
                    976:                                }
                    977:                                /*
                    978:                                 * Loose routing, and not at next destination
                    979:                                 * yet; nothing to do except forward.
                    980:                                 */
                    981:                                break;
                    982:                        }
1.339     ozaki-r   983:                        pserialize_read_exit(s);
                    984:
1.1       cgd       985:                        off--;                  /* 0 origin */
1.112     sommerfe  986:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       987:                                /*
                    988:                                 * End of source route.  Should be for us.
                    989:                                 */
                    990:                                save_rte(cp, ip->ip_src);
                    991:                                break;
                    992:                        }
                    993:                        /*
                    994:                         * locate outgoing interface
                    995:                         */
1.281     tsutsui   996:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       997:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   998:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   999:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                   1000:                                    &psref);
1.339     ozaki-r  1001:                                if (ifa != NULL)
                   1002:                                        ia = ifatoia(ifa);
                   1003:                                else
                   1004:                                        ia = NULL;
                   1005:                        } else {
1.346     ozaki-r  1006:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1007:                        }
                   1008:                        if (ia == NULL) {
1.1       cgd      1009:                                type = ICMP_UNREACH;
                   1010:                                code = ICMP_UNREACH_SRCFAIL;
                   1011:                                goto bad;
                   1012:                        }
                   1013:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1014:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1015:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1016:                        ia4_release(ia, &psref);
1.1       cgd      1017:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1018:                        /*
                   1019:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1020:                         */
1.18      mycroft  1021:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1022:                        break;
1.346     ozaki-r  1023:                    }
1.1       cgd      1024:
1.346     ozaki-r  1025:                case IPOPT_RR: {
                   1026:                        struct psref psref;
1.114     itojun   1027:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1028:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1029:                                goto bad;
                   1030:                        }
1.1       cgd      1031:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1032:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1033:                                goto bad;
                   1034:                        }
                   1035:                        /*
                   1036:                         * If no space remains, ignore.
                   1037:                         */
                   1038:                        off--;                  /* 0 origin */
1.112     sommerfe 1039:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1040:                                break;
1.281     tsutsui  1041:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1042:                            sizeof(ipaddr.sin_addr));
                   1043:                        /*
                   1044:                         * locate outgoing interface; if we're the destination,
                   1045:                         * use the incoming interface (should be same).
                   1046:                         */
1.346     ozaki-r  1047:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1048:                        if (ifa == NULL) {
1.346     ozaki-r  1049:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1050:                                if (ia == NULL) {
                   1051:                                        type = ICMP_UNREACH;
                   1052:                                        code = ICMP_UNREACH_HOST;
                   1053:                                        goto bad;
                   1054:                                }
                   1055:                        } else {
                   1056:                                ia = ifatoia(ifa);
1.1       cgd      1057:                        }
1.244     christos 1058:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1059:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1060:                        ia4_release(ia, &psref);
1.1       cgd      1061:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1062:                        break;
1.346     ozaki-r  1063:                    }
1.1       cgd      1064:
                   1065:                case IPOPT_TS:
                   1066:                        code = cp - (u_char *)ip;
                   1067:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1068:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1069:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1070:                                goto bad;
1.114     itojun   1071:                        }
                   1072:                        if (ipt->ipt_ptr < 5) {
                   1073:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1074:                                goto bad;
                   1075:                        }
1.15      cgd      1076:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1077:                                if (++ipt->ipt_oflw == 0) {
                   1078:                                        code = (u_char *)&ipt->ipt_ptr -
                   1079:                                            (u_char *)ip;
1.1       cgd      1080:                                        goto bad;
1.114     itojun   1081:                                }
1.1       cgd      1082:                                break;
                   1083:                        }
1.104     thorpej  1084:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1085:                        switch (ipt->ipt_flg) {
                   1086:
                   1087:                        case IPOPT_TS_TSONLY:
                   1088:                                break;
                   1089:
1.329     ozaki-r  1090:                        case IPOPT_TS_TSANDADDR: {
                   1091:                                struct ifnet *rcvif;
1.339     ozaki-r  1092:                                int _s, _ss;
1.329     ozaki-r  1093:
1.66      thorpej  1094:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1095:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1096:                                        code = (u_char *)&ipt->ipt_ptr -
                   1097:                                            (u_char *)ip;
1.1       cgd      1098:                                        goto bad;
1.114     itojun   1099:                                }
1.13      mycroft  1100:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1101:                                _ss = pserialize_read_enter();
                   1102:                                rcvif = m_get_rcvif(m, &_s);
1.349     ozaki-r  1103:                                if (__predict_true(rcvif != NULL)) {
                   1104:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1105:                                            rcvif);
                   1106:                                }
1.339     ozaki-r  1107:                                m_put_rcvif(rcvif, &_s);
                   1108:                                if (ifa == NULL) {
                   1109:                                        pserialize_read_exit(_ss);
                   1110:                                        break;
                   1111:                                }
                   1112:                                ia = ifatoia(ifa);
1.104     thorpej  1113:                                bcopy(&ia->ia_addr.sin_addr,
                   1114:                                    cp0, sizeof(struct in_addr));
1.339     ozaki-r  1115:                                pserialize_read_exit(_ss);
1.1       cgd      1116:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1117:                                break;
1.329     ozaki-r  1118:                        }
1.1       cgd      1119:
                   1120:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1121:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1122:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1123:                                        code = (u_char *)&ipt->ipt_ptr -
                   1124:                                            (u_char *)ip;
1.1       cgd      1125:                                        goto bad;
1.114     itojun   1126:                                }
1.281     tsutsui  1127:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1128:                                    sizeof(struct in_addr));
1.339     ozaki-r  1129:                                s = pserialize_read_enter();
                   1130:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1131:                                if (ifa == NULL) {
                   1132:                                        pserialize_read_exit(s);
1.1       cgd      1133:                                        continue;
1.339     ozaki-r  1134:                                }
                   1135:                                pserialize_read_exit(s);
1.1       cgd      1136:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1137:                                break;
                   1138:
                   1139:                        default:
1.114     itojun   1140:                                /* XXX can't take &ipt->ipt_flg */
                   1141:                                code = (u_char *)&ipt->ipt_ptr -
                   1142:                                    (u_char *)ip + 1;
1.1       cgd      1143:                                goto bad;
                   1144:                        }
                   1145:                        ntime = iptime();
1.107     thorpej  1146:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1147:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1148:                            sizeof(n_time));
                   1149:                        ipt->ipt_ptr += sizeof(n_time);
                   1150:                }
                   1151:        }
                   1152:        if (forward) {
1.329     ozaki-r  1153:                struct ifnet *rcvif;
1.339     ozaki-r  1154:                struct psref _psref;
1.329     ozaki-r  1155:
1.26      thorpej  1156:                if (ip_forwsrcrt == 0) {
                   1157:                        type = ICMP_UNREACH;
                   1158:                        code = ICMP_UNREACH_SRCFAIL;
                   1159:                        goto bad;
                   1160:                }
1.329     ozaki-r  1161:
1.339     ozaki-r  1162:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1163:                if (__predict_false(rcvif == NULL)) {
                   1164:                        type = ICMP_UNREACH;
                   1165:                        code = ICMP_UNREACH_HOST;
                   1166:                        goto bad;
                   1167:                }
1.329     ozaki-r  1168:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1169:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1170:                return true;
1.13      mycroft  1171:        }
1.311     rmind    1172:        return false;
1.1       cgd      1173: bad:
1.13      mycroft  1174:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1175:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1176:        return true;
1.1       cgd      1177: }
                   1178:
                   1179: /*
1.311     rmind    1180:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1181:  * return internet address info of interface to be used to get there.
                   1182:  */
1.311     rmind    1183: static struct in_ifaddr *
1.346     ozaki-r  1184: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1185: {
1.249     dyoung   1186:        struct rtentry *rt;
                   1187:        union {
                   1188:                struct sockaddr         dst;
                   1189:                struct sockaddr_in      dst4;
                   1190:        } u;
1.340     ozaki-r  1191:        struct route *ro;
1.249     dyoung   1192:
                   1193:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1194:
1.340     ozaki-r  1195:        ro = percpu_getref(ipforward_rt_percpu);
                   1196:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1197:        if (rt == NULL) {
                   1198:                percpu_putref(ipforward_rt_percpu);
                   1199:                return NULL;
                   1200:        }
                   1201:
1.346     ozaki-r  1202:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1203:        rtcache_unref(rt, ro);
1.340     ozaki-r  1204:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1205:
                   1206:        return ifatoia(rt->rt_ifa);
1.1       cgd      1207: }
                   1208:
                   1209: /*
1.311     rmind    1210:  * save_rte: save incoming source route for use in replies, to be picked
                   1211:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1212:  */
1.311     rmind    1213: static void
1.211     perry    1214: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1215: {
                   1216:        unsigned olen;
                   1217:
                   1218:        olen = option[IPOPT_OLEN];
                   1219:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1220:                return;
1.281     tsutsui  1221:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1222:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1223:        ip_srcrt.dst = dst;
                   1224: }
                   1225:
                   1226: /*
                   1227:  * Retrieve incoming source route for use in replies,
                   1228:  * in the same form used by setsockopt.
                   1229:  * The first hop is placed before the options, will be removed later.
                   1230:  */
                   1231: struct mbuf *
1.211     perry    1232: ip_srcroute(void)
1.1       cgd      1233: {
1.109     augustss 1234:        struct in_addr *p, *q;
                   1235:        struct mbuf *m;
1.1       cgd      1236:
                   1237:        if (ip_nhops == 0)
1.237     dyoung   1238:                return NULL;
1.1       cgd      1239:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1240:        if (m == 0)
1.237     dyoung   1241:                return NULL;
1.1       cgd      1242:
1.164     matt     1243:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1244: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1245:
                   1246:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1247:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1248:            OPTSIZ;
                   1249:
                   1250:        /*
                   1251:         * First save first hop for return route
                   1252:         */
                   1253:        p = &ip_srcrt.route[ip_nhops - 1];
                   1254:        *(mtod(m, struct in_addr *)) = *p--;
                   1255:
                   1256:        /*
                   1257:         * Copy option fields and padding (nop) to mbuf.
                   1258:         */
                   1259:        ip_srcrt.nop = IPOPT_NOP;
                   1260:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1261:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1262:            OPTSIZ);
                   1263:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1264:            sizeof(struct in_addr) + OPTSIZ);
                   1265: #undef OPTSIZ
                   1266:        /*
                   1267:         * Record return path as an IP source route,
                   1268:         * reversing the path (pointers are now aligned).
                   1269:         */
                   1270:        while (p >= ip_srcrt.route) {
                   1271:                *q++ = *p--;
                   1272:        }
                   1273:        /*
                   1274:         * Last hop goes to final destination.
                   1275:         */
                   1276:        *q = ip_srcrt.dst;
                   1277:        return (m);
                   1278: }
                   1279:
1.139     matt     1280: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1281:        [PRC_MSGSIZE] = EMSGSIZE,
                   1282:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1283:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1284:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1285:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1286:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1287:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1288:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1289:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1290: };
                   1291:
1.295     dyoung   1292: void
                   1293: ip_fasttimo(void)
                   1294: {
                   1295:        if (ip_drainwanted) {
                   1296:                ip_drain();
                   1297:                ip_drainwanted = 0;
                   1298:        }
                   1299: }
                   1300:
                   1301: void
                   1302: ip_drainstub(void)
                   1303: {
                   1304:        ip_drainwanted = 1;
                   1305: }
                   1306:
1.1       cgd      1307: /*
                   1308:  * Forward a packet.  If some error occurs return the sender
                   1309:  * an icmp packet.  Note we can't always generate a meaningful
                   1310:  * icmp message because icmp doesn't have a large enough repertoire
                   1311:  * of codes and types.
                   1312:  *
                   1313:  * If not forwarding, just drop the packet.  This could be confusing
                   1314:  * if ipforwarding was zero but some routing protocol was advancing
                   1315:  * us as a gateway to somewhere.  However, we must let the routing
                   1316:  * protocol deal with that.
                   1317:  *
                   1318:  * The srcrt parameter indicates whether the packet is being forwarded
                   1319:  * via a source route.
                   1320:  */
1.313     rmind    1321: static void
1.329     ozaki-r  1322: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1323: {
1.109     augustss 1324:        struct ip *ip = mtod(m, struct ip *);
                   1325:        struct rtentry *rt;
1.220     christos 1326:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1327:        struct mbuf *mcopy;
1.13      mycroft  1328:        n_long dest;
1.249     dyoung   1329:        union {
                   1330:                struct sockaddr         dst;
                   1331:                struct sockaddr_in      dst4;
                   1332:        } u;
1.320     ozaki-r  1333:        uint64_t *ips;
1.340     ozaki-r  1334:        struct route *ro;
1.164     matt     1335:
1.318     rmind    1336:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1337:            "interrupt handler; synchronization assumptions violated");
                   1338:
1.164     matt     1339:        /*
                   1340:         * We are now in the output path.
                   1341:         */
                   1342:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1343:
                   1344:        /*
                   1345:         * Clear any in-bound checksum flags for this packet.
                   1346:         */
                   1347:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1348:
1.13      mycroft  1349:        dest = 0;
1.93      sommerfe 1350:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1351:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1352:                m_freem(m);
                   1353:                return;
                   1354:        }
1.318     rmind    1355:
1.1       cgd      1356:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1357:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1358:                return;
                   1359:        }
                   1360:
1.249     dyoung   1361:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1362:
1.340     ozaki-r  1363:        ro = percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1364:        rt = rtcache_lookup(ro, &u.dst);
                   1365:        if (rt == NULL) {
1.340     ozaki-r  1366:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1367:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1368:                return;
1.1       cgd      1369:        }
                   1370:
                   1371:        /*
1.34      mycroft  1372:         * Save at most 68 bytes of the packet in case
1.1       cgd      1373:         * we need to generate an ICMP message to the src.
1.119     itojun   1374:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1375:         */
1.155     itojun   1376:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1377:        if (mcopy)
                   1378:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1379:
1.221     christos 1380:        ip->ip_ttl -= IPTTLDEC;
                   1381:
1.1       cgd      1382:        /*
                   1383:         * If forwarding packet using same interface that it came in on,
                   1384:         * perhaps should send a redirect to sender to shortcut a hop.
                   1385:         * Only send redirect if source is sending directly to us,
                   1386:         * and if packet was not source routed (or has any options).
                   1387:         * Also, don't send redirect if forwarding using a default route
                   1388:         * or a route modified by a redirect.
                   1389:         */
1.329     ozaki-r  1390:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1391:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1392:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1393:            ipsendredirects && !srcrt) {
1.19      mycroft  1394:                if (rt->rt_ifa &&
                   1395:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1396:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1397:                        if (rt->rt_flags & RTF_GATEWAY)
                   1398:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1399:                        else
                   1400:                                dest = ip->ip_dst.s_addr;
                   1401:                        /*
                   1402:                         * Router requirements says to only send host
                   1403:                         * redirects.
                   1404:                         */
                   1405:                        type = ICMP_REDIRECT;
                   1406:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1407:                }
                   1408:        }
1.345     ozaki-r  1409:        rtcache_unref(rt, ro);
1.1       cgd      1410:
1.340     ozaki-r  1411:        error = ip_output(m, NULL, ro,
1.173     jonathan 1412:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1413:            NULL, NULL);
1.173     jonathan 1414:
1.320     ozaki-r  1415:        if (error) {
1.266     thorpej  1416:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1417:                goto error;
                   1418:        }
                   1419:
                   1420:        ips = IP_STAT_GETREF();
                   1421:        ips[IP_STAT_FORWARD]++;
                   1422:
                   1423:        if (type) {
                   1424:                ips[IP_STAT_REDIRECTSENT]++;
                   1425:                IP_STAT_PUTREF();
                   1426:                goto redirect;
                   1427:        }
                   1428:
                   1429:        IP_STAT_PUTREF();
                   1430:        if (mcopy) {
1.63      matt     1431: #ifdef GATEWAY
1.320     ozaki-r  1432:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1433:                        ipflow_create(ro, mcopy);
1.63      matt     1434: #endif
1.320     ozaki-r  1435:                m_freem(mcopy);
1.1       cgd      1436:        }
1.320     ozaki-r  1437:
1.340     ozaki-r  1438:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1439:        return;
                   1440:
                   1441: redirect:
                   1442: error:
1.318     rmind    1443:        if (mcopy == NULL) {
1.340     ozaki-r  1444:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1445:                return;
1.318     rmind    1446:        }
1.13      mycroft  1447:
1.1       cgd      1448:        switch (error) {
                   1449:
                   1450:        case 0:                         /* forwarded, but need redirect */
                   1451:                /* type, code set above */
                   1452:                break;
                   1453:
                   1454:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1455:        case EHOSTUNREACH:
                   1456:        case ENETDOWN:
                   1457:        case EHOSTDOWN:
                   1458:        default:
                   1459:                type = ICMP_UNREACH;
                   1460:                code = ICMP_UNREACH_HOST;
                   1461:                break;
                   1462:
                   1463:        case EMSGSIZE:
                   1464:                type = ICMP_UNREACH;
                   1465:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1466:
1.345     ozaki-r  1467:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1468:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1469:                        rtcache_unref(rt, ro);
                   1470:                }
1.305     rmind    1471: #ifdef IPSEC
1.317     christos 1472:                if (ipsec_used)
                   1473:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1474: #endif
1.266     thorpej  1475:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1476:                break;
                   1477:
                   1478:        case ENOBUFS:
1.143     itojun   1479:                /*
1.311     rmind    1480:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1481:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1482:                 * big problem under DoS attacks or if the underlying
                   1483:                 * interface is rate-limited.
1.143     itojun   1484:                 */
                   1485:                if (mcopy)
                   1486:                        m_freem(mcopy);
1.340     ozaki-r  1487:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1488:                return;
1.1       cgd      1489:        }
1.220     christos 1490:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1491:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1492: }
                   1493:
                   1494: void
1.211     perry    1495: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1496:     struct mbuf *m)
1.44      thorpej  1497: {
1.311     rmind    1498:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1499:        ifnet_t *ifp;
1.311     rmind    1500:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1501:        struct psref psref;
1.44      thorpej  1502:
1.329     ozaki-r  1503:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1504:        if (__predict_false(ifp == NULL))
                   1505:                return; /* XXX should report error? */
                   1506:
1.311     rmind    1507:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1508: #ifdef SO_OTIMESTAMP
1.311     rmind    1509:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1510: #endif
                   1511:            ) {
1.44      thorpej  1512:                struct timeval tv;
                   1513:
                   1514:                microtime(&tv);
1.278     christos 1515: #ifdef SO_OTIMESTAMP
1.311     rmind    1516:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1517:                        struct timeval50 tv50;
                   1518:                        timeval_to_timeval50(&tv, &tv50);
                   1519:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1520:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1521:                } else
                   1522: #endif
1.244     christos 1523:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1524:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1525:                if (*mp)
                   1526:                        mp = &(*mp)->m_next;
                   1527:        }
1.311     rmind    1528:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1529:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1530:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1531:                if (*mp)
                   1532:                        mp = &(*mp)->m_next;
                   1533:        }
1.311     rmind    1534:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1535:                struct in_pktinfo ipi;
1.307     christos 1536:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1537:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1538:                *mp = sbcreatecontrol((void *) &ipi,
                   1539:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1540:                if (*mp)
                   1541:                        mp = &(*mp)->m_next;
                   1542:        }
1.311     rmind    1543:        if (inpflags & INP_PKTINFO) {
1.306     christos 1544:                struct in_pktinfo ipi;
1.307     christos 1545:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1546:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1547:                *mp = sbcreatecontrol((void *) &ipi,
                   1548:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1549:                if (*mp)
                   1550:                        mp = &(*mp)->m_next;
                   1551:        }
1.311     rmind    1552:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1553:                struct sockaddr_dl sdl;
                   1554:
1.337     ozaki-r  1555:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1556:                    NULL, 0);
1.251     dyoung   1557:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1558:                if (*mp)
                   1559:                        mp = &(*mp)->m_next;
                   1560:        }
1.311     rmind    1561:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1562:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1563:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1564:                if (*mp)
                   1565:                        mp = &(*mp)->m_next;
                   1566:        }
1.329     ozaki-r  1567:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1568: }
                   1569:
1.189     atatat   1570: /*
1.228     elad     1571:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1572:  */
                   1573: static int
                   1574: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1575: {
                   1576:        int error, tmp;
                   1577:        struct sysctlnode node;
                   1578:
                   1579:        node = *rnode;
                   1580:        tmp = ip_forwsrcrt;
                   1581:        node.sysctl_data = &tmp;
                   1582:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1583:        if (error || newp == NULL)
                   1584:                return (error);
                   1585:
1.280     elad     1586:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1587:            0, NULL, NULL, NULL);
                   1588:        if (error)
                   1589:                return (error);
1.228     elad     1590:
                   1591:        ip_forwsrcrt = tmp;
                   1592:
                   1593:        return (0);
                   1594: }
                   1595:
                   1596: /*
1.189     atatat   1597:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1598:  * range of the new value and tweaks timers if it changes.
                   1599:  */
                   1600: static int
                   1601: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1602: {
1.189     atatat   1603:        int error, tmp;
                   1604:        struct sysctlnode node;
                   1605:
1.350     ozaki-r  1606:        icmp_mtudisc_lock();
                   1607:
1.189     atatat   1608:        node = *rnode;
                   1609:        tmp = ip_mtudisc_timeout;
                   1610:        node.sysctl_data = &tmp;
                   1611:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1612:        if (error || newp == NULL)
1.350     ozaki-r  1613:                goto out;
                   1614:        if (tmp < 0) {
                   1615:                error = EINVAL;
                   1616:                goto out;
                   1617:        }
1.273     matt     1618:
1.189     atatat   1619:        ip_mtudisc_timeout = tmp;
                   1620:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350     ozaki-r  1621:        error = 0;
                   1622: out:
                   1623:        icmp_mtudisc_unlock();
1.351     ozaki-r  1624:        return error;
1.189     atatat   1625: }
1.54      lukem    1626:
1.266     thorpej  1627: static int
                   1628: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1629: {
                   1630:
1.271     thorpej  1631:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1632: }
1.131     itojun   1633:
1.284     pooka    1634: static void
                   1635: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1636: {
1.197     atatat   1637:        sysctl_createv(clog, 0, NULL, NULL,
                   1638:                       CTLFLAG_PERMANENT,
1.203     atatat   1639:                       CTLTYPE_NODE, "inet",
                   1640:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1641:                       NULL, 0, NULL, 0,
                   1642:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT,
1.203     atatat   1645:                       CTLTYPE_NODE, "ip",
                   1646:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1647:                       NULL, 0, NULL, 0,
                   1648:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1649:
1.197     atatat   1650:        sysctl_createv(clog, 0, NULL, NULL,
                   1651:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1652:                       CTLTYPE_INT, "forwarding",
                   1653:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1654:                       NULL, 0, &ipforwarding, 0,
                   1655:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1656:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1657:        sysctl_createv(clog, 0, NULL, NULL,
                   1658:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1659:                       CTLTYPE_INT, "redirect",
                   1660:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1661:                       NULL, 0, &ipsendredirects, 0,
                   1662:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1663:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1664:        sysctl_createv(clog, 0, NULL, NULL,
                   1665:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1666:                       CTLTYPE_INT, "ttl",
                   1667:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1668:                       NULL, 0, &ip_defttl, 0,
                   1669:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1670:                       IPCTL_DEFTTL, CTL_EOL);
                   1671: #ifdef IPCTL_DEFMTU
1.197     atatat   1672:        sysctl_createv(clog, 0, NULL, NULL,
                   1673:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1674:                       CTLTYPE_INT, "mtu",
                   1675:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1676:                       NULL, 0, &ip_mtu, 0,
                   1677:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1678:                       IPCTL_DEFMTU, CTL_EOL);
                   1679: #endif /* IPCTL_DEFMTU */
1.197     atatat   1680:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1681:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1682:                       CTLTYPE_INT, "forwsrcrt",
                   1683:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1684:                                    "datagrams"),
1.228     elad     1685:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1686:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1687:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1688:        sysctl_createv(clog, 0, NULL, NULL,
                   1689:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1690:                       CTLTYPE_INT, "directed-broadcast",
                   1691:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1692:                       NULL, 0, &ip_directedbcast, 0,
                   1693:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1694:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1695:        sysctl_createv(clog, 0, NULL, NULL,
                   1696:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1697:                       CTLTYPE_INT, "allowsrcrt",
                   1698:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1699:                       NULL, 0, &ip_allowsrcrt, 0,
                   1700:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1701:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1702:
1.197     atatat   1703:        sysctl_createv(clog, 0, NULL, NULL,
                   1704:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1705:                       CTLTYPE_INT, "mtudisc",
                   1706:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1707:                       NULL, 0, &ip_mtudisc, 0,
                   1708:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1709:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1710:        sysctl_createv(clog, 0, NULL, NULL,
                   1711:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1712:                       CTLTYPE_INT, "anonportmin",
                   1713:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1714:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1715:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1716:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1717:        sysctl_createv(clog, 0, NULL, NULL,
                   1718:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1719:                       CTLTYPE_INT, "anonportmax",
                   1720:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1721:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1722:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1723:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1724:        sysctl_createv(clog, 0, NULL, NULL,
                   1725:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1726:                       CTLTYPE_INT, "mtudisctimeout",
                   1727:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1728:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1729:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1730:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1731: #ifndef IPNOPRIVPORTS
1.197     atatat   1732:        sysctl_createv(clog, 0, NULL, NULL,
                   1733:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1734:                       CTLTYPE_INT, "lowportmin",
                   1735:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1736:                                    "to assign"),
1.189     atatat   1737:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1738:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1739:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1740:        sysctl_createv(clog, 0, NULL, NULL,
                   1741:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1742:                       CTLTYPE_INT, "lowportmax",
                   1743:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1744:                                    "to assign"),
1.189     atatat   1745:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1746:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1747:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1748: #endif /* IPNOPRIVPORTS */
                   1749: #if NGRE > 0
1.197     atatat   1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1752:                       CTLTYPE_INT, "grettl",
                   1753:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1754:                       NULL, 0, &ip_gre_ttl, 0,
                   1755:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1756:                       IPCTL_GRE_TTL, CTL_EOL);
                   1757: #endif /* NGRE */
1.197     atatat   1758:        sysctl_createv(clog, 0, NULL, NULL,
                   1759:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1760:                       CTLTYPE_INT, "checkinterface",
                   1761:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1762:                                    "from RFC1122"),
1.189     atatat   1763:                       NULL, 0, &ip_checkinterface, 0,
                   1764:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1765:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1766:        sysctl_createv(clog, 0, NULL, NULL,
                   1767:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1768:                       CTLTYPE_INT, "random_id",
                   1769:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1770:                       NULL, 0, &ip_do_randomid, 0,
                   1771:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1772:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1773:        sysctl_createv(clog, 0, NULL, NULL,
                   1774:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1775:                       CTLTYPE_INT, "do_loopback_cksum",
                   1776:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1777:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1778:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1779:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1780:        sysctl_createv(clog, 0, NULL, NULL,
                   1781:                       CTLFLAG_PERMANENT,
                   1782:                       CTLTYPE_STRUCT, "stats",
                   1783:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1784:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1785:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1786:                       CTL_EOL);
1.322     joerg    1787: #if NARP
1.321     roy      1788:        sysctl_createv(clog, 0, NULL, NULL,
                   1789:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1790:                       CTLTYPE_INT, "dad_count",
                   1791:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1792:                                    "probes to send"),
                   1793:                       NULL, 0, &ip_dad_count, 0,
                   1794:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1795:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1796: #endif
1.301     christos 1797:
                   1798:        /* anonportalgo RFC6056 subtree */
1.302     christos 1799:        const struct sysctlnode *portalgo_node;
                   1800:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1801:                       CTLFLAG_PERMANENT,
                   1802:                       CTLTYPE_NODE, "anonportalgo",
                   1803:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1804:                       NULL, 0, NULL, 0,
                   1805:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1806:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1807:                       CTLFLAG_PERMANENT,
                   1808:                       CTLTYPE_STRING, "available",
                   1809:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1810:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1811:                       CTL_CREATE, CTL_EOL);
1.302     christos 1812:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1813:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1814:                       CTLTYPE_STRING, "selected",
                   1815:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1816:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1817:                       CTL_CREATE, CTL_EOL);
                   1818:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1819:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1820:                       CTLTYPE_STRUCT, "reserve",
                   1821:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1822:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1823:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1824: }
1.266     thorpej  1825:
                   1826: void
                   1827: ip_statinc(u_int stat)
                   1828: {
                   1829:
                   1830:        KASSERT(stat < IP_NSTATS);
                   1831:        IP_STATINC(stat);
                   1832: }

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