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Annotation of src/sys/netinet/ip_input.c, Revision 1.347

1.347   ! ozaki-r     1: /*     $NetBSD: ip_input.c,v 1.346 2016/12/08 06:25:43 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>
1.347   ! ozaki-r    94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.346 2016/12/08 06:25:43 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");
1.1       cgd       356: }
                    357:
1.333     ozaki-r   358: static struct in_ifaddr *
                    359: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    360: {
                    361:        struct in_ifaddr *ia = NULL;
                    362:        int checkif;
                    363:
                    364:        /*
                    365:         * Enable a consistency check between the destination address
                    366:         * and the arrival interface for a unicast packet (the RFC 1122
                    367:         * strong ES model) if IP forwarding is disabled and the packet
                    368:         * is not locally generated.
                    369:         *
                    370:         * XXX - Checking also should be disabled if the destination
                    371:         * address is ipnat'ed to a different interface.
                    372:         *
                    373:         * XXX - Checking is incompatible with IP aliases added
                    374:         * to the loopback interface instead of the interface where
                    375:         * the packets are received.
                    376:         *
                    377:         * XXX - We need to add a per ifaddr flag for this so that
                    378:         * we get finer grain control.
                    379:         */
                    380:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    381:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    382:
1.334     ozaki-r   383:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   384:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    385:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    386:                                continue;
                    387:                        if (checkif && ia->ia_ifp != ifp)
                    388:                                continue;
1.341     roy       389:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
                    390:                            (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333     ozaki-r   391:                                break;
                    392:                        else
1.338     ozaki-r   393:                                (*downmatch)++;
1.333     ozaki-r   394:                }
                    395:        }
                    396:
                    397:        return ia;
                    398: }
                    399:
                    400: static struct in_ifaddr *
                    401: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    402: {
                    403:        struct in_ifaddr *ia = NULL;
                    404:        struct ifaddr *ifa;
                    405:
1.336     ozaki-r   406:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   407:                if (ifa->ifa_addr->sa_family != AF_INET)
                    408:                        continue;
                    409:                ia = ifatoia(ifa);
1.341     roy       410:                if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333     ozaki-r   411:                        continue;
                    412:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    413:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    414:                    /*
                    415:                     * Look for all-0's host part (old broadcast addr),
                    416:                     * either for subnet or net.
                    417:                     */
                    418:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    419:                    ip->ip_dst.s_addr == ia->ia_net)
                    420:                        goto matched;
                    421:                /*
                    422:                 * An interface with IP address zero accepts
                    423:                 * all packets that arrive on that interface.
                    424:                 */
                    425:                if (in_nullhost(ia->ia_addr.sin_addr))
                    426:                        goto matched;
                    427:        }
                    428:        ia = NULL;
                    429:
                    430: matched:
                    431:        return ia;
                    432: }
                    433:
1.1       cgd       434: /*
1.318     rmind     435:  * IP software interrupt routine.
1.89      itojun    436:  */
1.318     rmind     437: static void
                    438: ipintr(void *arg __unused)
1.89      itojun    439: {
                    440:        struct mbuf *m;
1.286     tls       441:
1.318     rmind     442:        KASSERT(cpu_softintr_p());
1.89      itojun    443:
1.344     ozaki-r   444: #ifndef NET_MPSAFE
1.268     ad        445:        mutex_enter(softnet_lock);
1.344     ozaki-r   446: #endif
1.318     rmind     447:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    448:                ip_input(m);
                    449:        }
1.344     ozaki-r   450: #ifndef NET_MPSAFE
1.268     ad        451:        mutex_exit(softnet_lock);
1.344     ozaki-r   452: #endif
1.89      itojun    453: }
                    454:
                    455: /*
1.318     rmind     456:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       457:  * try to reassemble.  Process options.  Pass to next level.
                    458:  */
1.312     rmind     459: static void
1.89      itojun    460: ip_input(struct mbuf *m)
1.1       cgd       461: {
1.109     augustss  462:        struct ip *ip = NULL;
1.339     ozaki-r   463:        struct in_ifaddr *ia = NULL;
1.288     rmind     464:        int hlen = 0, len;
1.100     itojun    465:        int downmatch;
1.169     itojun    466:        int srcrt = 0;
1.314     rmind     467:        ifnet_t *ifp;
1.329     ozaki-r   468:        struct psref psref;
1.339     ozaki-r   469:        int s;
1.1       cgd       470:
1.318     rmind     471:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    472:            "interrupt handler; synchronization assumptions violated");
                    473:
1.164     matt      474:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     475:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   476:
                    477:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   478:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   479:                goto out;
1.164     matt      480:
1.1       cgd       481:        /*
                    482:         * If no IP addresses have been set yet but the interfaces
                    483:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     484:         * Note: we pre-check without locks held.
1.1       cgd       485:         */
1.335     ozaki-r   486:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   487:                goto out;
1.266     thorpej   488:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     489:
1.154     thorpej   490:        /*
                    491:         * If the IP header is not aligned, slurp it up into a new
                    492:         * mbuf with space for link headers, in the event we forward
                    493:         * it.  Otherwise, if it is aligned, make sure the entire
                    494:         * base IP header is in the first mbuf of the chain.
                    495:         */
1.244     christos  496:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   497:                if ((m = m_copyup(m, sizeof(struct ip),
                    498:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    499:                        /* XXXJRT new stat, please */
1.266     thorpej   500:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   501:                        goto out;
1.154     thorpej   502:                }
                    503:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    504:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   505:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   506:                        goto out;
1.154     thorpej   507:                }
1.1       cgd       508:        }
                    509:        ip = mtod(m, struct ip *);
1.13      mycroft   510:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   511:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   512:                goto out;
1.13      mycroft   513:        }
1.1       cgd       514:        hlen = ip->ip_hl << 2;
                    515:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   516:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   517:                goto out;
1.1       cgd       518:        }
                    519:        if (hlen > m->m_len) {
1.298     liamjfoy  520:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   521:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   522:                        goto out;
1.1       cgd       523:                }
                    524:                ip = mtod(m, struct ip *);
                    525:        }
1.98      thorpej   526:
1.85      hwr       527:        /*
1.99      thorpej   528:         * RFC1122: packets with a multicast source address are
1.98      thorpej   529:         * not allowed.
1.85      hwr       530:         */
                    531:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   532:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   533:                goto out;
1.129     itojun    534:        }
                    535:
                    536:        /* 127/8 must not appear on wire - RFC1122 */
                    537:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    538:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     539:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   540:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   541:                        goto out;
1.130     itojun    542:                }
1.85      hwr       543:        }
                    544:
1.135     thorpej   545:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     546:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   547:                 M_CSUM_IPv4_BAD)) {
                    548:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    549:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   550:                IP_STATINC(IP_STAT_BADSUM);
                    551:                goto out;
1.135     thorpej   552:
                    553:        case M_CSUM_IPv4:
                    554:                /* Checksum was okay. */
                    555:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    556:                break;
                    557:
                    558:        default:
1.206     thorpej   559:                /*
                    560:                 * Must compute it ourselves.  Maybe skip checksum on
                    561:                 * loopback interfaces.
                    562:                 */
1.314     rmind     563:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    564:                    ip_do_loopback_cksum)) {
1.206     thorpej   565:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   566:                        if (in_cksum(m, hlen) != 0) {
                    567:                                IP_STATINC(IP_STAT_BADSUM);
                    568:                                goto out;
                    569:                        }
1.206     thorpej   570:                }
1.135     thorpej   571:                break;
1.1       cgd       572:        }
                    573:
1.121     thorpej   574:        /* Retrieve the packet length. */
                    575:        len = ntohs(ip->ip_len);
1.81      proff     576:
                    577:        /*
                    578:         * Check for additional length bogosity
                    579:         */
1.84      proff     580:        if (len < hlen) {
1.266     thorpej   581:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   582:                goto out;
1.81      proff     583:        }
1.1       cgd       584:
                    585:        /*
                    586:         * Check that the amount of data in the buffers
                    587:         * is as at least much as the IP header would have us expect.
                    588:         * Trim mbufs if longer than we expect.
                    589:         * Drop packet if shorter than we expect.
                    590:         */
1.35      mycroft   591:        if (m->m_pkthdr.len < len) {
1.266     thorpej   592:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   593:                goto out;
1.1       cgd       594:        }
1.35      mycroft   595:        if (m->m_pkthdr.len > len) {
1.1       cgd       596:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   597:                        m->m_len = len;
                    598:                        m->m_pkthdr.len = len;
1.1       cgd       599:                } else
1.35      mycroft   600:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       601:        }
                    602:
1.64      thorpej   603:        /*
                    604:         * Assume that we can create a fast-forward IP flow entry
                    605:         * based on this packet.
                    606:         */
                    607:        m->m_flags |= M_CANFASTFWD;
                    608:
1.33      mrg       609:        /*
1.64      thorpej   610:         * Run through list of hooks for input packets.  If there are any
                    611:         * filters which require that additional packets in the flow are
                    612:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    613:         * Note that filters must _never_ set this flag, as another filter
                    614:         * in the list may have previously cleared it.
1.33      mrg       615:         */
1.304     christos  616: #if defined(IPSEC)
1.317     christos  617:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    618: #else
                    619:        if (1)
                    620: #endif
                    621:        {
1.314     rmind     622:                struct in_addr odst = ip->ip_dst;
1.318     rmind     623:                bool freed;
1.169     itojun    624:
1.318     rmind     625:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    626:                if (freed || m == NULL) {
1.343     ozaki-r   627:                        m = NULL;
1.329     ozaki-r   628:                        goto out;
1.318     rmind     629:                }
1.127     itojun    630:                ip = mtod(m, struct ip *);
1.142     darrenr   631:                hlen = ip->ip_hl << 2;
1.318     rmind     632:
1.205     darrenr   633:                /*
                    634:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    635:                 * from generating ICMP redirects for packets that have
                    636:                 * been redirected by a hook back out on to the same LAN that
                    637:                 * they came from and is not an indication that the packet
                    638:                 * is being inffluenced by source routing options.  This
                    639:                 * allows things like
                    640:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    641:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    642:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    643:                 * also requires a "map tlp0 ..." to complete the story.
                    644:                 * One might argue whether or not this kind of network config.
1.212     perry     645:                 * should be supported in this manner...
1.205     darrenr   646:                 */
1.169     itojun    647:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    648:        }
1.123     thorpej   649:
                    650: #ifdef ALTQ
                    651:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     652:        if (altq_input) {
                    653:                SOFTNET_LOCK();
                    654:                if ((*altq_input)(m, AF_INET) == 0) {
                    655:                        /* Packet dropped by traffic conditioner. */
                    656:                        SOFTNET_UNLOCK();
1.343     ozaki-r   657:                        m = NULL;
1.329     ozaki-r   658:                        goto out;
1.318     rmind     659:                }
                    660:                SOFTNET_UNLOCK();
1.123     thorpej   661:        }
                    662: #endif
1.121     thorpej   663:
                    664:        /*
1.1       cgd       665:         * Process options and, if not destined for us,
                    666:         * ship it on.  ip_dooptions returns 1 when an
                    667:         * error was detected (causing an icmp message
                    668:         * to be sent and the original packet to be freed).
                    669:         */
                    670:        ip_nhops = 0;           /* for source routed packets */
1.343     ozaki-r   671:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    672:                m = NULL;
1.329     ozaki-r   673:                goto out;
1.343     ozaki-r   674:        }
1.1       cgd       675:
                    676:        /*
                    677:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    678:         *
                    679:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    680:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       681:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       682:         */
1.100     itojun    683:        downmatch = 0;
1.339     ozaki-r   684:        s = pserialize_read_enter();
1.333     ozaki-r   685:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   686:        if (ia != NULL) {
                    687:                pserialize_read_exit(s);
1.86      thorpej   688:                goto ours;
1.339     ozaki-r   689:        }
1.333     ozaki-r   690:
1.315     christos  691:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   692:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   693:                if (ia != NULL) {
                    694:                        pserialize_read_exit(s);
1.333     ozaki-r   695:                        goto ours;
1.339     ozaki-r   696:                }
1.1       cgd       697:        }
1.339     ozaki-r   698:        pserialize_read_exit(s);
1.333     ozaki-r   699:
1.18      mycroft   700:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   701: #ifdef MROUTING
                    702:                extern struct socket *ip_mrouter;
1.10      brezak    703:
1.4       hpeyerl   704:                if (ip_mrouter) {
                    705:                        /*
                    706:                         * If we are acting as a multicast router, all
                    707:                         * incoming multicast packets are passed to the
                    708:                         * kernel-level multicast forwarding function.
                    709:                         * The packet is returned (relatively) intact; if
                    710:                         * ip_mforward() returns a non-zero value, the packet
                    711:                         * must be discarded, else it may be accepted below.
                    712:                         *
                    713:                         * (The IP ident field is put in the same byte order
                    714:                         * as expected when ip_mforward() is called from
                    715:                         * ip_output().)
                    716:                         */
1.318     rmind     717:                        SOFTNET_LOCK();
1.314     rmind     718:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     719:                                SOFTNET_UNLOCK();
1.266     thorpej   720:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   721:                                goto out;
1.4       hpeyerl   722:                        }
1.318     rmind     723:                        SOFTNET_UNLOCK();
1.4       hpeyerl   724:
                    725:                        /*
                    726:                         * The process-level routing demon needs to receive
                    727:                         * all multicast IGMP packets, whether or not this
                    728:                         * host belongs to their destination groups.
                    729:                         */
1.318     rmind     730:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   731:                                goto ours;
1.318     rmind     732:                        }
1.266     thorpej   733:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   734:                }
                    735: #endif
                    736:                /*
                    737:                 * See if we belong to the destination multicast group on the
                    738:                 * arrival interface.
                    739:                 */
1.316     rmind     740:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   741:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   742:                        goto out;
1.4       hpeyerl   743:                }
                    744:                goto ours;
                    745:        }
1.19      mycroft   746:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   747:            in_nullhost(ip->ip_dst))
1.1       cgd       748:                goto ours;
                    749:
                    750:        /*
                    751:         * Not for us; forward if possible and desirable.
                    752:         */
                    753:        if (ipforwarding == 0) {
1.329     ozaki-r   754:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   755:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       756:                m_freem(m);
1.100     itojun    757:        } else {
                    758:                /*
                    759:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    760:                 * and there's no IFF_UP interface that matches ip_dst,
                    761:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    762:                 * forwarding loop till TTL goes to 0.
                    763:                 */
                    764:                if (downmatch) {
1.329     ozaki-r   765:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    766:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   767:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    768:                        return;
                    769:                }
1.304     christos  770: #ifdef IPSEC
1.305     rmind     771:                /* Perform IPsec, if any. */
1.318     rmind     772:                if (ipsec_used) {
                    773:                        SOFTNET_LOCK();
                    774:                        if (ipsec4_input(m, IP_FORWARDING |
                    775:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    776:                                SOFTNET_UNLOCK();
1.332     ozaki-r   777:                                goto out;
1.318     rmind     778:                        }
                    779:                        SOFTNET_UNLOCK();
1.173     jonathan  780:                }
1.305     rmind     781: #endif
1.329     ozaki-r   782:                ip_forward(m, srcrt, ifp);
                    783:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    784:        }
1.89      itojun    785:        return;
1.1       cgd       786:
                    787: ours:
1.329     ozaki-r   788:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   789:        ifp = NULL;
1.329     ozaki-r   790:
1.1       cgd       791:        /*
                    792:         * If offset or IP_MF are set, must reassemble.
                    793:         */
1.155     itojun    794:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     795:                /*
                    796:                 * Pass to IP reassembly mechanism.
                    797:                 */
1.290     rmind     798:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     799:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   800:                        goto out;
1.16      cgd       801:                }
1.290     rmind     802:                if (m == NULL) {
1.289     rmind     803:                        /* More fragments should come; silently return. */
1.332     ozaki-r   804:                        goto out;
1.289     rmind     805:                }
1.290     rmind     806:                /*
                    807:                 * Reassembly is done, we have the final packet.
                    808:                 * Updated cached data in local variable(s).
                    809:                 */
1.289     rmind     810:                ip = mtod(m, struct ip *);
                    811:                hlen = ip->ip_hl << 2;
1.79      mycroft   812:        }
1.128     itojun    813:
1.304     christos  814: #ifdef IPSEC
1.173     jonathan  815:        /*
1.305     rmind     816:         * Enforce IPsec policy checking if we are seeing last header.
                    817:         * Note that we do not visit this with protocols with PCB layer
                    818:         * code - like UDP/TCP/raw IP.
1.173     jonathan  819:         */
1.317     christos  820:        if (ipsec_used &&
1.328     riastrad  821:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     822:                SOFTNET_LOCK();
1.305     rmind     823:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     824:                        SOFTNET_UNLOCK();
1.332     ozaki-r   825:                        goto out;
1.173     jonathan  826:                }
1.318     rmind     827:                SOFTNET_UNLOCK();
1.173     jonathan  828:        }
1.305     rmind     829: #endif
1.1       cgd       830:
                    831:        /*
                    832:         * Switch out to protocol's input routine.
                    833:         */
1.82      aidan     834: #if IFA_STATS
1.339     ozaki-r   835:        if (ia && ip) {
                    836:                struct in_ifaddr *_ia;
                    837:                /*
                    838:                 * Keep a reference from ip_match_our_address with psref
                    839:                 * is expensive, so explore ia here again.
                    840:                 */
                    841:                s = pserialize_read_enter();
1.342     ozaki-r   842:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   843:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    844:                pserialize_read_exit(s);
                    845:        }
1.82      aidan     846: #endif
1.266     thorpej   847:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    848:
1.318     rmind     849:        const int off = hlen, nh = ip->ip_p;
                    850:
                    851:        SOFTNET_LOCK();
1.328     riastrad  852:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     853:        SOFTNET_UNLOCK();
1.89      itojun    854:        return;
1.135     thorpej   855:
1.329     ozaki-r   856: out:
                    857:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   858:        if (m != NULL)
                    859:                m_freem(m);
1.1       cgd       860: }
                    861:
                    862: /*
1.288     rmind     863:  * IP timer processing.
1.1       cgd       864:  */
1.8       mycroft   865: void
1.211     perry     866: ip_slowtimo(void)
1.1       cgd       867: {
1.268     ad        868:
                    869:        mutex_enter(softnet_lock);
                    870:        KERNEL_LOCK(1, NULL);
1.1       cgd       871:
1.288     rmind     872:        ip_reass_slowtimo();
1.268     ad        873:
                    874:        KERNEL_UNLOCK_ONE(NULL);
                    875:        mutex_exit(softnet_lock);
1.1       cgd       876: }
                    877:
                    878: /*
1.288     rmind     879:  * IP drain processing.
1.1       cgd       880:  */
1.8       mycroft   881: void
1.211     perry     882: ip_drain(void)
1.1       cgd       883: {
                    884:
1.268     ad        885:        KERNEL_LOCK(1, NULL);
1.288     rmind     886:        ip_reass_drain();
1.268     ad        887:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       888: }
                    889:
                    890: /*
1.311     rmind     891:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    892:  * it if bad options are encountered, or forwarding it if source-routed.
                    893:  *
                    894:  * => Returns true if packet has been forwarded/freed.
                    895:  * => Returns false if the packet should be processed further.
1.1       cgd       896:  */
1.311     rmind     897: static bool
1.211     perry     898: ip_dooptions(struct mbuf *m)
1.1       cgd       899: {
1.109     augustss  900:        struct ip *ip = mtod(m, struct ip *);
                    901:        u_char *cp, *cp0;
                    902:        struct ip_timestamp *ipt;
                    903:        struct in_ifaddr *ia;
1.1       cgd       904:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   905:        struct in_addr dst;
1.1       cgd       906:        n_time ntime;
1.339     ozaki-r   907:        struct ifaddr *ifa;
                    908:        int s;
1.1       cgd       909:
1.13      mycroft   910:        dst = ip->ip_dst;
1.1       cgd       911:        cp = (u_char *)(ip + 1);
                    912:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    913:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    914:                opt = cp[IPOPT_OPTVAL];
                    915:                if (opt == IPOPT_EOL)
                    916:                        break;
                    917:                if (opt == IPOPT_NOP)
                    918:                        optlen = 1;
                    919:                else {
1.113     itojun    920:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    921:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    922:                                goto bad;
                    923:                        }
1.1       cgd       924:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    925:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       926:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    927:                                goto bad;
                    928:                        }
                    929:                }
                    930:                switch (opt) {
                    931:
                    932:                default:
                    933:                        break;
                    934:
                    935:                /*
                    936:                 * Source routing with record.
                    937:                 * Find interface with current destination address.
                    938:                 * If none on this machine then drop if strictly routed,
                    939:                 * or do nothing if loosely routed.
                    940:                 * Record interface address and bring up next address
                    941:                 * component.  If strictly routed make sure next
                    942:                 * address is on directly accessible net.
                    943:                 */
                    944:                case IPOPT_LSRR:
1.346     ozaki-r   945:                case IPOPT_SSRR: {
                    946:                        struct psref psref;
1.47      cjs       947:                        if (ip_allowsrcrt == 0) {
                    948:                                type = ICMP_UNREACH;
                    949:                                code = ICMP_UNREACH_NET_PROHIB;
                    950:                                goto bad;
                    951:                        }
1.114     itojun    952:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    953:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    954:                                goto bad;
                    955:                        }
1.1       cgd       956:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    957:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    958:                                goto bad;
                    959:                        }
                    960:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   961:
                    962:                        s = pserialize_read_enter();
                    963:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    964:                        if (ifa == NULL) {
                    965:                                pserialize_read_exit(s);
1.1       cgd       966:                                if (opt == IPOPT_SSRR) {
                    967:                                        type = ICMP_UNREACH;
                    968:                                        code = ICMP_UNREACH_SRCFAIL;
                    969:                                        goto bad;
                    970:                                }
                    971:                                /*
                    972:                                 * Loose routing, and not at next destination
                    973:                                 * yet; nothing to do except forward.
                    974:                                 */
                    975:                                break;
                    976:                        }
1.339     ozaki-r   977:                        pserialize_read_exit(s);
                    978:
1.1       cgd       979:                        off--;                  /* 0 origin */
1.112     sommerfe  980:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       981:                                /*
                    982:                                 * End of source route.  Should be for us.
                    983:                                 */
                    984:                                save_rte(cp, ip->ip_src);
                    985:                                break;
                    986:                        }
                    987:                        /*
                    988:                         * locate outgoing interface
                    989:                         */
1.281     tsutsui   990:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       991:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   992:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   993:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    994:                                    &psref);
1.339     ozaki-r   995:                                if (ifa != NULL)
                    996:                                        ia = ifatoia(ifa);
                    997:                                else
                    998:                                        ia = NULL;
                    999:                        } else {
1.346     ozaki-r  1000:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1001:                        }
                   1002:                        if (ia == NULL) {
1.1       cgd      1003:                                type = ICMP_UNREACH;
                   1004:                                code = ICMP_UNREACH_SRCFAIL;
                   1005:                                goto bad;
                   1006:                        }
                   1007:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1008:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1009:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1010:                        ia4_release(ia, &psref);
1.1       cgd      1011:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1012:                        /*
                   1013:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1014:                         */
1.18      mycroft  1015:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1016:                        break;
1.346     ozaki-r  1017:                    }
1.1       cgd      1018:
1.346     ozaki-r  1019:                case IPOPT_RR: {
                   1020:                        struct psref psref;
1.114     itojun   1021:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1022:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1023:                                goto bad;
                   1024:                        }
1.1       cgd      1025:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1026:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1027:                                goto bad;
                   1028:                        }
                   1029:                        /*
                   1030:                         * If no space remains, ignore.
                   1031:                         */
                   1032:                        off--;                  /* 0 origin */
1.112     sommerfe 1033:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1034:                                break;
1.281     tsutsui  1035:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1036:                            sizeof(ipaddr.sin_addr));
                   1037:                        /*
                   1038:                         * locate outgoing interface; if we're the destination,
                   1039:                         * use the incoming interface (should be same).
                   1040:                         */
1.346     ozaki-r  1041:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1042:                        if (ifa == NULL) {
1.346     ozaki-r  1043:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1044:                                if (ia == NULL) {
                   1045:                                        type = ICMP_UNREACH;
                   1046:                                        code = ICMP_UNREACH_HOST;
                   1047:                                        goto bad;
                   1048:                                }
                   1049:                        } else {
                   1050:                                ia = ifatoia(ifa);
1.1       cgd      1051:                        }
1.244     christos 1052:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1053:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1054:                        ia4_release(ia, &psref);
1.1       cgd      1055:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1056:                        break;
1.346     ozaki-r  1057:                    }
1.1       cgd      1058:
                   1059:                case IPOPT_TS:
                   1060:                        code = cp - (u_char *)ip;
                   1061:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1062:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1063:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1064:                                goto bad;
1.114     itojun   1065:                        }
                   1066:                        if (ipt->ipt_ptr < 5) {
                   1067:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1068:                                goto bad;
                   1069:                        }
1.15      cgd      1070:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1071:                                if (++ipt->ipt_oflw == 0) {
                   1072:                                        code = (u_char *)&ipt->ipt_ptr -
                   1073:                                            (u_char *)ip;
1.1       cgd      1074:                                        goto bad;
1.114     itojun   1075:                                }
1.1       cgd      1076:                                break;
                   1077:                        }
1.104     thorpej  1078:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1079:                        switch (ipt->ipt_flg) {
                   1080:
                   1081:                        case IPOPT_TS_TSONLY:
                   1082:                                break;
                   1083:
1.329     ozaki-r  1084:                        case IPOPT_TS_TSANDADDR: {
                   1085:                                struct ifnet *rcvif;
1.339     ozaki-r  1086:                                int _s, _ss;
1.329     ozaki-r  1087:
1.66      thorpej  1088:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1089:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1090:                                        code = (u_char *)&ipt->ipt_ptr -
                   1091:                                            (u_char *)ip;
1.1       cgd      1092:                                        goto bad;
1.114     itojun   1093:                                }
1.13      mycroft  1094:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1095:                                _ss = pserialize_read_enter();
                   1096:                                rcvif = m_get_rcvif(m, &_s);
                   1097:                                ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif);
                   1098:                                m_put_rcvif(rcvif, &_s);
                   1099:                                if (ifa == NULL) {
                   1100:                                        pserialize_read_exit(_ss);
                   1101:                                        break;
                   1102:                                }
                   1103:                                ia = ifatoia(ifa);
1.104     thorpej  1104:                                bcopy(&ia->ia_addr.sin_addr,
                   1105:                                    cp0, sizeof(struct in_addr));
1.339     ozaki-r  1106:                                pserialize_read_exit(_ss);
1.1       cgd      1107:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1108:                                break;
1.329     ozaki-r  1109:                        }
1.1       cgd      1110:
                   1111:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1112:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1113:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1114:                                        code = (u_char *)&ipt->ipt_ptr -
                   1115:                                            (u_char *)ip;
1.1       cgd      1116:                                        goto bad;
1.114     itojun   1117:                                }
1.281     tsutsui  1118:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1119:                                    sizeof(struct in_addr));
1.339     ozaki-r  1120:                                s = pserialize_read_enter();
                   1121:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1122:                                if (ifa == NULL) {
                   1123:                                        pserialize_read_exit(s);
1.1       cgd      1124:                                        continue;
1.339     ozaki-r  1125:                                }
                   1126:                                pserialize_read_exit(s);
1.1       cgd      1127:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1128:                                break;
                   1129:
                   1130:                        default:
1.114     itojun   1131:                                /* XXX can't take &ipt->ipt_flg */
                   1132:                                code = (u_char *)&ipt->ipt_ptr -
                   1133:                                    (u_char *)ip + 1;
1.1       cgd      1134:                                goto bad;
                   1135:                        }
                   1136:                        ntime = iptime();
1.107     thorpej  1137:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1138:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1139:                            sizeof(n_time));
                   1140:                        ipt->ipt_ptr += sizeof(n_time);
                   1141:                }
                   1142:        }
                   1143:        if (forward) {
1.329     ozaki-r  1144:                struct ifnet *rcvif;
1.339     ozaki-r  1145:                struct psref _psref;
1.329     ozaki-r  1146:
1.26      thorpej  1147:                if (ip_forwsrcrt == 0) {
                   1148:                        type = ICMP_UNREACH;
                   1149:                        code = ICMP_UNREACH_SRCFAIL;
                   1150:                        goto bad;
                   1151:                }
1.329     ozaki-r  1152:
1.339     ozaki-r  1153:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1154:                if (__predict_false(rcvif == NULL)) {
                   1155:                        type = ICMP_UNREACH;
                   1156:                        code = ICMP_UNREACH_HOST;
                   1157:                        goto bad;
                   1158:                }
1.329     ozaki-r  1159:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1160:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1161:                return true;
1.13      mycroft  1162:        }
1.311     rmind    1163:        return false;
1.1       cgd      1164: bad:
1.13      mycroft  1165:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1166:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1167:        return true;
1.1       cgd      1168: }
                   1169:
                   1170: /*
1.311     rmind    1171:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1172:  * return internet address info of interface to be used to get there.
                   1173:  */
1.311     rmind    1174: static struct in_ifaddr *
1.346     ozaki-r  1175: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1176: {
1.249     dyoung   1177:        struct rtentry *rt;
                   1178:        union {
                   1179:                struct sockaddr         dst;
                   1180:                struct sockaddr_in      dst4;
                   1181:        } u;
1.340     ozaki-r  1182:        struct route *ro;
1.249     dyoung   1183:
                   1184:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1185:
1.340     ozaki-r  1186:        ro = percpu_getref(ipforward_rt_percpu);
                   1187:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1188:        if (rt == NULL) {
                   1189:                percpu_putref(ipforward_rt_percpu);
                   1190:                return NULL;
                   1191:        }
                   1192:
1.346     ozaki-r  1193:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1194:        rtcache_unref(rt, ro);
1.340     ozaki-r  1195:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1196:
                   1197:        return ifatoia(rt->rt_ifa);
1.1       cgd      1198: }
                   1199:
                   1200: /*
1.311     rmind    1201:  * save_rte: save incoming source route for use in replies, to be picked
                   1202:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1203:  */
1.311     rmind    1204: static void
1.211     perry    1205: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1206: {
                   1207:        unsigned olen;
                   1208:
                   1209:        olen = option[IPOPT_OLEN];
                   1210:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1211:                return;
1.281     tsutsui  1212:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1213:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1214:        ip_srcrt.dst = dst;
                   1215: }
                   1216:
                   1217: /*
                   1218:  * Retrieve incoming source route for use in replies,
                   1219:  * in the same form used by setsockopt.
                   1220:  * The first hop is placed before the options, will be removed later.
                   1221:  */
                   1222: struct mbuf *
1.211     perry    1223: ip_srcroute(void)
1.1       cgd      1224: {
1.109     augustss 1225:        struct in_addr *p, *q;
                   1226:        struct mbuf *m;
1.1       cgd      1227:
                   1228:        if (ip_nhops == 0)
1.237     dyoung   1229:                return NULL;
1.1       cgd      1230:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1231:        if (m == 0)
1.237     dyoung   1232:                return NULL;
1.1       cgd      1233:
1.164     matt     1234:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1235: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1236:
                   1237:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1238:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1239:            OPTSIZ;
                   1240:
                   1241:        /*
                   1242:         * First save first hop for return route
                   1243:         */
                   1244:        p = &ip_srcrt.route[ip_nhops - 1];
                   1245:        *(mtod(m, struct in_addr *)) = *p--;
                   1246:
                   1247:        /*
                   1248:         * Copy option fields and padding (nop) to mbuf.
                   1249:         */
                   1250:        ip_srcrt.nop = IPOPT_NOP;
                   1251:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1252:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1253:            OPTSIZ);
                   1254:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1255:            sizeof(struct in_addr) + OPTSIZ);
                   1256: #undef OPTSIZ
                   1257:        /*
                   1258:         * Record return path as an IP source route,
                   1259:         * reversing the path (pointers are now aligned).
                   1260:         */
                   1261:        while (p >= ip_srcrt.route) {
                   1262:                *q++ = *p--;
                   1263:        }
                   1264:        /*
                   1265:         * Last hop goes to final destination.
                   1266:         */
                   1267:        *q = ip_srcrt.dst;
                   1268:        return (m);
                   1269: }
                   1270:
1.139     matt     1271: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1272:        [PRC_MSGSIZE] = EMSGSIZE,
                   1273:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1274:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1275:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1276:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1277:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1278:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1279:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1280:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1281: };
                   1282:
1.295     dyoung   1283: void
                   1284: ip_fasttimo(void)
                   1285: {
                   1286:        if (ip_drainwanted) {
                   1287:                ip_drain();
                   1288:                ip_drainwanted = 0;
                   1289:        }
                   1290: }
                   1291:
                   1292: void
                   1293: ip_drainstub(void)
                   1294: {
                   1295:        ip_drainwanted = 1;
                   1296: }
                   1297:
1.1       cgd      1298: /*
                   1299:  * Forward a packet.  If some error occurs return the sender
                   1300:  * an icmp packet.  Note we can't always generate a meaningful
                   1301:  * icmp message because icmp doesn't have a large enough repertoire
                   1302:  * of codes and types.
                   1303:  *
                   1304:  * If not forwarding, just drop the packet.  This could be confusing
                   1305:  * if ipforwarding was zero but some routing protocol was advancing
                   1306:  * us as a gateway to somewhere.  However, we must let the routing
                   1307:  * protocol deal with that.
                   1308:  *
                   1309:  * The srcrt parameter indicates whether the packet is being forwarded
                   1310:  * via a source route.
                   1311:  */
1.313     rmind    1312: static void
1.329     ozaki-r  1313: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1314: {
1.109     augustss 1315:        struct ip *ip = mtod(m, struct ip *);
                   1316:        struct rtentry *rt;
1.220     christos 1317:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1318:        struct mbuf *mcopy;
1.13      mycroft  1319:        n_long dest;
1.249     dyoung   1320:        union {
                   1321:                struct sockaddr         dst;
                   1322:                struct sockaddr_in      dst4;
                   1323:        } u;
1.320     ozaki-r  1324:        uint64_t *ips;
1.340     ozaki-r  1325:        struct route *ro;
1.164     matt     1326:
1.318     rmind    1327:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1328:            "interrupt handler; synchronization assumptions violated");
                   1329:
1.164     matt     1330:        /*
                   1331:         * We are now in the output path.
                   1332:         */
                   1333:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1334:
                   1335:        /*
                   1336:         * Clear any in-bound checksum flags for this packet.
                   1337:         */
                   1338:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1339:
1.13      mycroft  1340:        dest = 0;
1.93      sommerfe 1341:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1342:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1343:                m_freem(m);
                   1344:                return;
                   1345:        }
1.318     rmind    1346:
1.1       cgd      1347:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1348:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1349:                return;
                   1350:        }
                   1351:
1.249     dyoung   1352:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1353:
1.340     ozaki-r  1354:        ro = percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1355:        rt = rtcache_lookup(ro, &u.dst);
                   1356:        if (rt == NULL) {
1.340     ozaki-r  1357:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1358:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1359:                return;
1.1       cgd      1360:        }
                   1361:
                   1362:        /*
1.34      mycroft  1363:         * Save at most 68 bytes of the packet in case
1.1       cgd      1364:         * we need to generate an ICMP message to the src.
1.119     itojun   1365:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1366:         */
1.155     itojun   1367:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1368:        if (mcopy)
                   1369:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1370:
1.221     christos 1371:        ip->ip_ttl -= IPTTLDEC;
                   1372:
1.1       cgd      1373:        /*
                   1374:         * If forwarding packet using same interface that it came in on,
                   1375:         * perhaps should send a redirect to sender to shortcut a hop.
                   1376:         * Only send redirect if source is sending directly to us,
                   1377:         * and if packet was not source routed (or has any options).
                   1378:         * Also, don't send redirect if forwarding using a default route
                   1379:         * or a route modified by a redirect.
                   1380:         */
1.329     ozaki-r  1381:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1382:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1383:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1384:            ipsendredirects && !srcrt) {
1.19      mycroft  1385:                if (rt->rt_ifa &&
                   1386:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1387:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1388:                        if (rt->rt_flags & RTF_GATEWAY)
                   1389:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1390:                        else
                   1391:                                dest = ip->ip_dst.s_addr;
                   1392:                        /*
                   1393:                         * Router requirements says to only send host
                   1394:                         * redirects.
                   1395:                         */
                   1396:                        type = ICMP_REDIRECT;
                   1397:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1398:                }
                   1399:        }
1.345     ozaki-r  1400:        rtcache_unref(rt, ro);
1.1       cgd      1401:
1.340     ozaki-r  1402:        error = ip_output(m, NULL, ro,
1.173     jonathan 1403:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1404:            NULL, NULL);
1.173     jonathan 1405:
1.320     ozaki-r  1406:        if (error) {
1.266     thorpej  1407:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1408:                goto error;
                   1409:        }
                   1410:
                   1411:        ips = IP_STAT_GETREF();
                   1412:        ips[IP_STAT_FORWARD]++;
                   1413:
                   1414:        if (type) {
                   1415:                ips[IP_STAT_REDIRECTSENT]++;
                   1416:                IP_STAT_PUTREF();
                   1417:                goto redirect;
                   1418:        }
                   1419:
                   1420:        IP_STAT_PUTREF();
                   1421:        if (mcopy) {
1.63      matt     1422: #ifdef GATEWAY
1.320     ozaki-r  1423:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1424:                        ipflow_create(ro, mcopy);
1.63      matt     1425: #endif
1.320     ozaki-r  1426:                m_freem(mcopy);
1.1       cgd      1427:        }
1.320     ozaki-r  1428:
1.340     ozaki-r  1429:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1430:        return;
                   1431:
                   1432: redirect:
                   1433: error:
1.318     rmind    1434:        if (mcopy == NULL) {
1.340     ozaki-r  1435:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1436:                return;
1.318     rmind    1437:        }
1.13      mycroft  1438:
1.1       cgd      1439:        switch (error) {
                   1440:
                   1441:        case 0:                         /* forwarded, but need redirect */
                   1442:                /* type, code set above */
                   1443:                break;
                   1444:
                   1445:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1446:        case EHOSTUNREACH:
                   1447:        case ENETDOWN:
                   1448:        case EHOSTDOWN:
                   1449:        default:
                   1450:                type = ICMP_UNREACH;
                   1451:                code = ICMP_UNREACH_HOST;
                   1452:                break;
                   1453:
                   1454:        case EMSGSIZE:
                   1455:                type = ICMP_UNREACH;
                   1456:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1457:
1.345     ozaki-r  1458:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1459:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1460:                        rtcache_unref(rt, ro);
                   1461:                }
1.305     rmind    1462: #ifdef IPSEC
1.317     christos 1463:                if (ipsec_used)
                   1464:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1465: #endif
1.266     thorpej  1466:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1467:                break;
                   1468:
                   1469:        case ENOBUFS:
1.143     itojun   1470:                /*
1.311     rmind    1471:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1472:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1473:                 * big problem under DoS attacks or if the underlying
                   1474:                 * interface is rate-limited.
1.143     itojun   1475:                 */
                   1476:                if (mcopy)
                   1477:                        m_freem(mcopy);
1.340     ozaki-r  1478:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1479:                return;
1.1       cgd      1480:        }
1.220     christos 1481:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1482:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1483: }
                   1484:
                   1485: void
1.211     perry    1486: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1487:     struct mbuf *m)
1.44      thorpej  1488: {
1.311     rmind    1489:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1490:        ifnet_t *ifp;
1.311     rmind    1491:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1492:        struct psref psref;
1.44      thorpej  1493:
1.329     ozaki-r  1494:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1495:        if (__predict_false(ifp == NULL))
                   1496:                return; /* XXX should report error? */
                   1497:
1.311     rmind    1498:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1499: #ifdef SO_OTIMESTAMP
1.311     rmind    1500:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1501: #endif
                   1502:            ) {
1.44      thorpej  1503:                struct timeval tv;
                   1504:
                   1505:                microtime(&tv);
1.278     christos 1506: #ifdef SO_OTIMESTAMP
1.311     rmind    1507:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1508:                        struct timeval50 tv50;
                   1509:                        timeval_to_timeval50(&tv, &tv50);
                   1510:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1511:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1512:                } else
                   1513: #endif
1.244     christos 1514:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1515:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1516:                if (*mp)
                   1517:                        mp = &(*mp)->m_next;
                   1518:        }
1.311     rmind    1519:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1520:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1521:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1522:                if (*mp)
                   1523:                        mp = &(*mp)->m_next;
                   1524:        }
1.311     rmind    1525:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1526:                struct in_pktinfo ipi;
1.307     christos 1527:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1528:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1529:                *mp = sbcreatecontrol((void *) &ipi,
                   1530:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1531:                if (*mp)
                   1532:                        mp = &(*mp)->m_next;
                   1533:        }
1.311     rmind    1534:        if (inpflags & INP_PKTINFO) {
1.306     christos 1535:                struct in_pktinfo ipi;
1.307     christos 1536:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1537:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1538:                *mp = sbcreatecontrol((void *) &ipi,
                   1539:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1540:                if (*mp)
                   1541:                        mp = &(*mp)->m_next;
                   1542:        }
1.311     rmind    1543:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1544:                struct sockaddr_dl sdl;
                   1545:
1.337     ozaki-r  1546:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1547:                    NULL, 0);
1.251     dyoung   1548:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1549:                if (*mp)
                   1550:                        mp = &(*mp)->m_next;
                   1551:        }
1.311     rmind    1552:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1553:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1554:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1555:                if (*mp)
                   1556:                        mp = &(*mp)->m_next;
                   1557:        }
1.329     ozaki-r  1558:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1559: }
                   1560:
1.189     atatat   1561: /*
1.228     elad     1562:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1563:  */
                   1564: static int
                   1565: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1566: {
                   1567:        int error, tmp;
                   1568:        struct sysctlnode node;
                   1569:
                   1570:        node = *rnode;
                   1571:        tmp = ip_forwsrcrt;
                   1572:        node.sysctl_data = &tmp;
                   1573:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1574:        if (error || newp == NULL)
                   1575:                return (error);
                   1576:
1.280     elad     1577:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1578:            0, NULL, NULL, NULL);
                   1579:        if (error)
                   1580:                return (error);
1.228     elad     1581:
                   1582:        ip_forwsrcrt = tmp;
                   1583:
                   1584:        return (0);
                   1585: }
                   1586:
                   1587: /*
1.189     atatat   1588:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1589:  * range of the new value and tweaks timers if it changes.
                   1590:  */
                   1591: static int
                   1592: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1593: {
1.189     atatat   1594:        int error, tmp;
                   1595:        struct sysctlnode node;
                   1596:
                   1597:        node = *rnode;
                   1598:        tmp = ip_mtudisc_timeout;
                   1599:        node.sysctl_data = &tmp;
                   1600:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1601:        if (error || newp == NULL)
                   1602:                return (error);
                   1603:        if (tmp < 0)
                   1604:                return (EINVAL);
1.52      thorpej  1605:
1.273     matt     1606:        mutex_enter(softnet_lock);
                   1607:
1.189     atatat   1608:        ip_mtudisc_timeout = tmp;
                   1609:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1610:
1.273     matt     1611:        mutex_exit(softnet_lock);
                   1612:
1.189     atatat   1613:        return (0);
                   1614: }
1.54      lukem    1615:
1.266     thorpej  1616: static int
                   1617: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1618: {
                   1619:
1.271     thorpej  1620:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1621: }
1.131     itojun   1622:
1.284     pooka    1623: static void
                   1624: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1625: {
1.197     atatat   1626:        sysctl_createv(clog, 0, NULL, NULL,
                   1627:                       CTLFLAG_PERMANENT,
1.203     atatat   1628:                       CTLTYPE_NODE, "inet",
                   1629:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1630:                       NULL, 0, NULL, 0,
                   1631:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1632:        sysctl_createv(clog, 0, NULL, NULL,
                   1633:                       CTLFLAG_PERMANENT,
1.203     atatat   1634:                       CTLTYPE_NODE, "ip",
                   1635:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1636:                       NULL, 0, NULL, 0,
                   1637:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1638:
1.197     atatat   1639:        sysctl_createv(clog, 0, NULL, NULL,
                   1640:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1641:                       CTLTYPE_INT, "forwarding",
                   1642:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1643:                       NULL, 0, &ipforwarding, 0,
                   1644:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1645:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1646:        sysctl_createv(clog, 0, NULL, NULL,
                   1647:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1648:                       CTLTYPE_INT, "redirect",
                   1649:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1650:                       NULL, 0, &ipsendredirects, 0,
                   1651:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1652:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1653:        sysctl_createv(clog, 0, NULL, NULL,
                   1654:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1655:                       CTLTYPE_INT, "ttl",
                   1656:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1657:                       NULL, 0, &ip_defttl, 0,
                   1658:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1659:                       IPCTL_DEFTTL, CTL_EOL);
                   1660: #ifdef IPCTL_DEFMTU
1.197     atatat   1661:        sysctl_createv(clog, 0, NULL, NULL,
                   1662:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1663:                       CTLTYPE_INT, "mtu",
                   1664:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1665:                       NULL, 0, &ip_mtu, 0,
                   1666:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1667:                       IPCTL_DEFMTU, CTL_EOL);
                   1668: #endif /* IPCTL_DEFMTU */
1.197     atatat   1669:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1670:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1671:                       CTLTYPE_INT, "forwsrcrt",
                   1672:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1673:                                    "datagrams"),
1.228     elad     1674:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1675:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1676:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1677:        sysctl_createv(clog, 0, NULL, NULL,
                   1678:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1679:                       CTLTYPE_INT, "directed-broadcast",
                   1680:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1681:                       NULL, 0, &ip_directedbcast, 0,
                   1682:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1683:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1684:        sysctl_createv(clog, 0, NULL, NULL,
                   1685:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1686:                       CTLTYPE_INT, "allowsrcrt",
                   1687:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1688:                       NULL, 0, &ip_allowsrcrt, 0,
                   1689:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1690:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1691:
1.197     atatat   1692:        sysctl_createv(clog, 0, NULL, NULL,
                   1693:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1694:                       CTLTYPE_INT, "mtudisc",
                   1695:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1696:                       NULL, 0, &ip_mtudisc, 0,
                   1697:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1698:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1699:        sysctl_createv(clog, 0, NULL, NULL,
                   1700:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1701:                       CTLTYPE_INT, "anonportmin",
                   1702:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1703:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1704:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1705:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1706:        sysctl_createv(clog, 0, NULL, NULL,
                   1707:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1708:                       CTLTYPE_INT, "anonportmax",
                   1709:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1710:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1711:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1712:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1713:        sysctl_createv(clog, 0, NULL, NULL,
                   1714:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1715:                       CTLTYPE_INT, "mtudisctimeout",
                   1716:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1717:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1718:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1719:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1720: #ifndef IPNOPRIVPORTS
1.197     atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1723:                       CTLTYPE_INT, "lowportmin",
                   1724:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1725:                                    "to assign"),
1.189     atatat   1726:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1727:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1728:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1731:                       CTLTYPE_INT, "lowportmax",
                   1732:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1733:                                    "to assign"),
1.189     atatat   1734:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1735:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1736:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1737: #endif /* IPNOPRIVPORTS */
                   1738: #if NGRE > 0
1.197     atatat   1739:        sysctl_createv(clog, 0, NULL, NULL,
                   1740:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1741:                       CTLTYPE_INT, "grettl",
                   1742:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1743:                       NULL, 0, &ip_gre_ttl, 0,
                   1744:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1745:                       IPCTL_GRE_TTL, CTL_EOL);
                   1746: #endif /* NGRE */
1.197     atatat   1747:        sysctl_createv(clog, 0, NULL, NULL,
                   1748:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1749:                       CTLTYPE_INT, "checkinterface",
                   1750:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1751:                                    "from RFC1122"),
1.189     atatat   1752:                       NULL, 0, &ip_checkinterface, 0,
                   1753:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1754:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1755:        sysctl_createv(clog, 0, NULL, NULL,
                   1756:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1757:                       CTLTYPE_INT, "random_id",
                   1758:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1759:                       NULL, 0, &ip_do_randomid, 0,
                   1760:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1761:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1762:        sysctl_createv(clog, 0, NULL, NULL,
                   1763:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1764:                       CTLTYPE_INT, "do_loopback_cksum",
                   1765:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1766:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1767:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1768:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1769:        sysctl_createv(clog, 0, NULL, NULL,
                   1770:                       CTLFLAG_PERMANENT,
                   1771:                       CTLTYPE_STRUCT, "stats",
                   1772:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1773:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1774:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1775:                       CTL_EOL);
1.322     joerg    1776: #if NARP
1.321     roy      1777:        sysctl_createv(clog, 0, NULL, NULL,
                   1778:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1779:                       CTLTYPE_INT, "dad_count",
                   1780:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1781:                                    "probes to send"),
                   1782:                       NULL, 0, &ip_dad_count, 0,
                   1783:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1784:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1785: #endif
1.301     christos 1786:
                   1787:        /* anonportalgo RFC6056 subtree */
1.302     christos 1788:        const struct sysctlnode *portalgo_node;
                   1789:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1790:                       CTLFLAG_PERMANENT,
                   1791:                       CTLTYPE_NODE, "anonportalgo",
                   1792:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1793:                       NULL, 0, NULL, 0,
                   1794:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1795:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1796:                       CTLFLAG_PERMANENT,
                   1797:                       CTLTYPE_STRING, "available",
                   1798:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1799:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1800:                       CTL_CREATE, CTL_EOL);
1.302     christos 1801:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1802:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1803:                       CTLTYPE_STRING, "selected",
                   1804:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1805:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1806:                       CTL_CREATE, CTL_EOL);
                   1807:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1808:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1809:                       CTLTYPE_STRUCT, "reserve",
                   1810:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1811:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1812:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1813: }
1.266     thorpej  1814:
                   1815: void
                   1816: ip_statinc(u_int stat)
                   1817: {
                   1818:
                   1819:        KASSERT(stat < IP_NSTATS);
                   1820:        IP_STATINC(stat);
                   1821: }

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