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Annotation of src/sys/netinet/ip_input.c, Revision 1.341

1.341   ! roy         1: /*     $NetBSD: ip_input.c,v 1.340 2016/08/31 09:14:47 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>
1.341   ! roy        94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.340 2016/08/31 09:14:47 ozaki-r Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.278     christos   98: #include "opt_compat_netbsd.h"
1.62      matt       99: #include "opt_gateway.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.324     pooka     104: #endif
1.1       cgd       105:
1.325     roy       106: #include "arp.h"
                    107:
1.5       mycroft   108: #include <sys/param.h>
                    109: #include <sys/systm.h>
1.318     rmind     110: #include <sys/cpu.h>
1.5       mycroft   111: #include <sys/mbuf.h>
                    112: #include <sys/domain.h>
                    113: #include <sys/protosw.h>
                    114: #include <sys/socket.h>
1.44      thorpej   115: #include <sys/socketvar.h>
1.5       mycroft   116: #include <sys/errno.h>
                    117: #include <sys/time.h>
                    118: #include <sys/kernel.h>
1.72      thorpej   119: #include <sys/pool.h>
1.28      christos  120: #include <sys/sysctl.h>
1.230     elad      121: #include <sys/kauth.h>
1.1       cgd       122:
1.5       mycroft   123: #include <net/if.h>
1.44      thorpej   124: #include <net/if_dl.h>
1.5       mycroft   125: #include <net/route.h>
1.318     rmind     126: #include <net/pktqueue.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
1.215     yamt      133: #include <netinet/in_proto.h>
1.5       mycroft   134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
1.266     thorpej   136: #include <netinet/ip_private.h>
1.5       mycroft   137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
1.144     martin    141: #include <net/if_gre.h>
                    142: #include "gre.h"
1.111     jdolecek  143:
                    144: #ifdef MROUTING
                    145: #include <netinet/ip_mroute.h>
                    146: #endif
1.302     christos  147: #include <netinet/portalgo.h>
1.89      itojun    148:
1.304     christos  149: #ifdef IPSEC
1.173     jonathan  150: #include <netipsec/ipsec.h>
1.305     rmind     151: #endif
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    156: #else /* GATEWAY */
                    157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    158: #endif /* GATEWAY */
                    159: #endif /* IPFORWARDING */
                    160: #ifndef        IPSENDREDIRECTS
                    161: #define        IPSENDREDIRECTS 1
                    162: #endif
1.26      thorpej   163: #ifndef IPFORWSRCRT
1.47      cjs       164: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    165: #endif
                    166: #ifndef IPALLOWSRCRT
1.48      mrg       167: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   168: #endif
1.53      kml       169: #ifndef IPMTUDISC
1.153     itojun    170: #define IPMTUDISC      1
1.53      kml       171: #endif
1.60      kml       172: #ifndef IPMTUDISCTIMEOUT
1.61      kml       173: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       174: #endif
1.53      kml       175:
1.278     christos  176: #ifdef COMPAT_50
                    177: #include <compat/sys/time.h>
                    178: #include <compat/sys/socket.h>
                    179: #endif
                    180:
1.27      thorpej   181: /*
                    182:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    183:  * configuration using this option will Just Work.
                    184:  */
                    185: #ifndef IPDIRECTEDBCAST
                    186: #ifdef DIRECTED_BROADCAST
                    187: #define IPDIRECTEDBCAST        1
                    188: #else
                    189: #define        IPDIRECTEDBCAST 0
                    190: #endif /* DIRECTED_BROADCAST */
                    191: #endif /* IPDIRECTEDBCAST */
1.1       cgd       192: int    ipforwarding = IPFORWARDING;
                    193: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   194: int    ip_defttl = IPDEFTTL;
1.26      thorpej   195: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   196: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       197: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       198: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    199: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       200: #ifdef DIAGNOSTIC
                    201: int    ipprintfs = 0;
                    202: #endif
1.184     jonathan  203:
                    204: int    ip_do_randomid = 0;
                    205:
1.165     christos  206: /*
                    207:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    208:  * the Strong ES model described in RFC 1122, but since the routing table
                    209:  * and transmit implementation do not implement the Strong ES model,
                    210:  * setting this to 1 results in an odd hybrid.
                    211:  *
                    212:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    213:  * to translate the destination address to another local interface.
                    214:  *
                    215:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    216:  * to the loopback interface instead of the interface where the
                    217:  * packets for those addresses are received.
                    218:  */
1.318     rmind     219: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  220:
1.60      kml       221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    222:
1.318     rmind     223: pktqueue_t *           ip_pktq                 __read_mostly;
                    224: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    225: ipid_state_t *         ip_ids                  __read_mostly;
                    226: percpu_t *             ipstat_percpu           __read_mostly;
                    227:
1.340     ozaki-r   228: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       229:
1.183     jonathan  230: uint16_t ip_id;
1.75      thorpej   231:
1.135     thorpej   232: #ifdef INET_CSUM_COUNTERS
                    233: #include <sys/device.h>
                    234:
                    235: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    236:     NULL, "inet", "hwcsum bad");
                    237: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    238:     NULL, "inet", "hwcsum ok");
                    239: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    240:     NULL, "inet", "swcsum");
                    241:
                    242: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    243:
1.201     matt      244: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    245: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    246: EVCNT_ATTACH_STATIC(ip_swcsum);
                    247:
1.135     thorpej   248: #else
                    249:
                    250: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    251:
                    252: #endif /* INET_CSUM_COUNTERS */
                    253:
1.1       cgd       254: /*
                    255:  * We need to save the IP options in case a protocol wants to respond
                    256:  * to an incoming packet over the same route if the packet got here
                    257:  * using IP source routing.  This allows connection establishment and
                    258:  * maintenance when the remote end is on a network that is not known
                    259:  * to us.
                    260:  */
1.311     rmind     261:
                    262: static int     ip_nhops = 0;
                    263:
1.1       cgd       264: static struct ip_srcrt {
                    265:        struct  in_addr dst;                    /* final destination */
                    266:        char    nop;                            /* one NOP to align */
                    267:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    268:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    269: } ip_srcrt;
                    270:
1.295     dyoung    271: static int ip_drainwanted;
                    272:
1.318     rmind     273: struct sockaddr_in ipaddr = {
                    274:        .sin_len = sizeof(ipaddr),
                    275:        .sin_family = AF_INET,
                    276: };
                    277:
1.210     perry     278: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   279:
1.164     matt      280: #ifdef MBUFTRACE
1.234     dogcow    281: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    282: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      283: #endif
                    284:
1.318     rmind     285: static void            ipintr(void *);
1.312     rmind     286: static void            ip_input(struct mbuf *);
1.329     ozaki-r   287: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     288: static bool            ip_dooptions(struct mbuf *);
                    289: static struct in_ifaddr *ip_rtaddr(struct in_addr);
                    290: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     291:
1.333     ozaki-r   292: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    293:                            int *);
                    294: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    295:                            struct ip *);
                    296:
1.318     rmind     297: /* XXX: Not yet enabled. */
                    298: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    299: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
                    300:
1.1       cgd       301: /*
                    302:  * IP initialization: fill in IP protocol switch table.
                    303:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    304:  */
1.8       mycroft   305: void
1.211     perry     306: ip_init(void)
1.1       cgd       307: {
1.199     matt      308:        const struct protosw *pr;
1.1       cgd       309:
1.311     rmind     310:        in_init();
1.284     pooka     311:        sysctl_net_inet_ip_setup(NULL);
                    312:
1.311     rmind     313:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    314:        KASSERT(pr != NULL);
1.275     pooka     315:
1.319     ozaki-r   316:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     317:        KASSERT(ip_pktq != NULL);
                    318:
1.328     riastrad  319:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    320:                ip_protox[i] = pr - inetsw;
1.311     rmind     321:        }
1.328     riastrad  322:        for (pr = inetdomain.dom_protosw;
                    323:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       324:                if (pr->pr_domain->dom_family == PF_INET &&
                    325:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  326:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  327:
1.288     rmind     328:        ip_reass_init();
1.190     jonathan  329:
1.291     rmind     330:        ip_ids = ip_id_init();
1.323     ozaki-r   331:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  332:
1.160     itojun    333:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   334: #ifdef GATEWAY
1.311     rmind     335:        ipflow_init();
1.73      thorpej   336: #endif
1.121     thorpej   337:
                    338:        /* Register our Packet Filter hook. */
1.308     rmind     339:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    340:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   341:
1.164     matt      342: #ifdef MBUFTRACE
                    343:        MOWNER_ATTACH(&ip_tx_mowner);
                    344:        MOWNER_ATTACH(&ip_rx_mowner);
                    345: #endif /* MBUFTRACE */
1.266     thorpej   346:
                    347:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340     ozaki-r   348:
                    349:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
                    350:        if (ipforward_rt_percpu == NULL)
                    351:                panic("failed to allocate ipforward_rt_percpu");
1.1       cgd       352: }
                    353:
1.333     ozaki-r   354: static struct in_ifaddr *
                    355: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    356: {
                    357:        struct in_ifaddr *ia = NULL;
                    358:        int checkif;
                    359:
                    360:        /*
                    361:         * Enable a consistency check between the destination address
                    362:         * and the arrival interface for a unicast packet (the RFC 1122
                    363:         * strong ES model) if IP forwarding is disabled and the packet
                    364:         * is not locally generated.
                    365:         *
                    366:         * XXX - Checking also should be disabled if the destination
                    367:         * address is ipnat'ed to a different interface.
                    368:         *
                    369:         * XXX - Checking is incompatible with IP aliases added
                    370:         * to the loopback interface instead of the interface where
                    371:         * the packets are received.
                    372:         *
                    373:         * XXX - We need to add a per ifaddr flag for this so that
                    374:         * we get finer grain control.
                    375:         */
                    376:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    377:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    378:
1.334     ozaki-r   379:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   380:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    381:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    382:                                continue;
                    383:                        if (checkif && ia->ia_ifp != ifp)
                    384:                                continue;
1.341   ! roy       385:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
        !           386:                            (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333     ozaki-r   387:                                break;
                    388:                        else
1.338     ozaki-r   389:                                (*downmatch)++;
1.333     ozaki-r   390:                }
                    391:        }
                    392:
                    393:        return ia;
                    394: }
                    395:
                    396: static struct in_ifaddr *
                    397: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    398: {
                    399:        struct in_ifaddr *ia = NULL;
                    400:        struct ifaddr *ifa;
                    401:
1.336     ozaki-r   402:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   403:                if (ifa->ifa_addr->sa_family != AF_INET)
                    404:                        continue;
                    405:                ia = ifatoia(ifa);
1.341   ! roy       406:                if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333     ozaki-r   407:                        continue;
                    408:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    409:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    410:                    /*
                    411:                     * Look for all-0's host part (old broadcast addr),
                    412:                     * either for subnet or net.
                    413:                     */
                    414:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    415:                    ip->ip_dst.s_addr == ia->ia_net)
                    416:                        goto matched;
                    417:                /*
                    418:                 * An interface with IP address zero accepts
                    419:                 * all packets that arrive on that interface.
                    420:                 */
                    421:                if (in_nullhost(ia->ia_addr.sin_addr))
                    422:                        goto matched;
                    423:        }
                    424:        ia = NULL;
                    425:
                    426: matched:
                    427:        return ia;
                    428: }
                    429:
1.1       cgd       430: /*
1.318     rmind     431:  * IP software interrupt routine.
1.89      itojun    432:  */
1.318     rmind     433: static void
                    434: ipintr(void *arg __unused)
1.89      itojun    435: {
                    436:        struct mbuf *m;
1.286     tls       437:
1.318     rmind     438:        KASSERT(cpu_softintr_p());
1.89      itojun    439:
1.268     ad        440:        mutex_enter(softnet_lock);
1.318     rmind     441:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    442:                ip_input(m);
                    443:        }
1.268     ad        444:        mutex_exit(softnet_lock);
1.89      itojun    445: }
                    446:
                    447: /*
1.318     rmind     448:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       449:  * try to reassemble.  Process options.  Pass to next level.
                    450:  */
1.312     rmind     451: static void
1.89      itojun    452: ip_input(struct mbuf *m)
1.1       cgd       453: {
1.109     augustss  454:        struct ip *ip = NULL;
1.339     ozaki-r   455:        struct in_ifaddr *ia = NULL;
1.288     rmind     456:        int hlen = 0, len;
1.100     itojun    457:        int downmatch;
1.169     itojun    458:        int srcrt = 0;
1.314     rmind     459:        ifnet_t *ifp;
1.329     ozaki-r   460:        struct psref psref;
1.339     ozaki-r   461:        int s;
1.1       cgd       462:
1.318     rmind     463:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    464:            "interrupt handler; synchronization assumptions violated");
                    465:
1.164     matt      466:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     467:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   468:
                    469:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   470:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   471:                goto out;
1.164     matt      472:
1.1       cgd       473:        /*
                    474:         * If no IP addresses have been set yet but the interfaces
                    475:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     476:         * Note: we pre-check without locks held.
1.1       cgd       477:         */
1.335     ozaki-r   478:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   479:                goto out;
1.266     thorpej   480:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     481:
1.154     thorpej   482:        /*
                    483:         * If the IP header is not aligned, slurp it up into a new
                    484:         * mbuf with space for link headers, in the event we forward
                    485:         * it.  Otherwise, if it is aligned, make sure the entire
                    486:         * base IP header is in the first mbuf of the chain.
                    487:         */
1.244     christos  488:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   489:                if ((m = m_copyup(m, sizeof(struct ip),
                    490:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    491:                        /* XXXJRT new stat, please */
1.266     thorpej   492:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   493:                        goto out;
1.154     thorpej   494:                }
                    495:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    496:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   497:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   498:                        goto out;
1.154     thorpej   499:                }
1.1       cgd       500:        }
                    501:        ip = mtod(m, struct ip *);
1.13      mycroft   502:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   503:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   504:                goto out;
1.13      mycroft   505:        }
1.1       cgd       506:        hlen = ip->ip_hl << 2;
                    507:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   508:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   509:                goto out;
1.1       cgd       510:        }
                    511:        if (hlen > m->m_len) {
1.298     liamjfoy  512:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   513:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   514:                        goto out;
1.1       cgd       515:                }
                    516:                ip = mtod(m, struct ip *);
                    517:        }
1.98      thorpej   518:
1.85      hwr       519:        /*
1.99      thorpej   520:         * RFC1122: packets with a multicast source address are
1.98      thorpej   521:         * not allowed.
1.85      hwr       522:         */
                    523:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   524:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   525:                goto out;
1.129     itojun    526:        }
                    527:
                    528:        /* 127/8 must not appear on wire - RFC1122 */
                    529:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    530:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     531:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   532:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   533:                        goto out;
1.130     itojun    534:                }
1.85      hwr       535:        }
                    536:
1.135     thorpej   537:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     538:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   539:                 M_CSUM_IPv4_BAD)) {
                    540:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    541:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   542:                IP_STATINC(IP_STAT_BADSUM);
                    543:                goto out;
1.135     thorpej   544:
                    545:        case M_CSUM_IPv4:
                    546:                /* Checksum was okay. */
                    547:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    548:                break;
                    549:
                    550:        default:
1.206     thorpej   551:                /*
                    552:                 * Must compute it ourselves.  Maybe skip checksum on
                    553:                 * loopback interfaces.
                    554:                 */
1.314     rmind     555:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    556:                    ip_do_loopback_cksum)) {
1.206     thorpej   557:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   558:                        if (in_cksum(m, hlen) != 0) {
                    559:                                IP_STATINC(IP_STAT_BADSUM);
                    560:                                goto out;
                    561:                        }
1.206     thorpej   562:                }
1.135     thorpej   563:                break;
1.1       cgd       564:        }
                    565:
1.121     thorpej   566:        /* Retrieve the packet length. */
                    567:        len = ntohs(ip->ip_len);
1.81      proff     568:
                    569:        /*
                    570:         * Check for additional length bogosity
                    571:         */
1.84      proff     572:        if (len < hlen) {
1.266     thorpej   573:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   574:                goto out;
1.81      proff     575:        }
1.1       cgd       576:
                    577:        /*
                    578:         * Check that the amount of data in the buffers
                    579:         * is as at least much as the IP header would have us expect.
                    580:         * Trim mbufs if longer than we expect.
                    581:         * Drop packet if shorter than we expect.
                    582:         */
1.35      mycroft   583:        if (m->m_pkthdr.len < len) {
1.266     thorpej   584:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   585:                goto out;
1.1       cgd       586:        }
1.35      mycroft   587:        if (m->m_pkthdr.len > len) {
1.1       cgd       588:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   589:                        m->m_len = len;
                    590:                        m->m_pkthdr.len = len;
1.1       cgd       591:                } else
1.35      mycroft   592:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       593:        }
                    594:
1.64      thorpej   595:        /*
                    596:         * Assume that we can create a fast-forward IP flow entry
                    597:         * based on this packet.
                    598:         */
                    599:        m->m_flags |= M_CANFASTFWD;
                    600:
1.33      mrg       601:        /*
1.64      thorpej   602:         * Run through list of hooks for input packets.  If there are any
                    603:         * filters which require that additional packets in the flow are
                    604:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    605:         * Note that filters must _never_ set this flag, as another filter
                    606:         * in the list may have previously cleared it.
1.33      mrg       607:         */
1.304     christos  608: #if defined(IPSEC)
1.317     christos  609:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    610: #else
                    611:        if (1)
                    612: #endif
                    613:        {
1.314     rmind     614:                struct in_addr odst = ip->ip_dst;
1.318     rmind     615:                bool freed;
1.169     itojun    616:
1.318     rmind     617:                SOFTNET_LOCK();
                    618:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    619:                SOFTNET_UNLOCK();
                    620:                if (freed || m == NULL) {
1.329     ozaki-r   621:                        goto out;
1.318     rmind     622:                }
1.127     itojun    623:                ip = mtod(m, struct ip *);
1.142     darrenr   624:                hlen = ip->ip_hl << 2;
1.318     rmind     625:
1.205     darrenr   626:                /*
                    627:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    628:                 * from generating ICMP redirects for packets that have
                    629:                 * been redirected by a hook back out on to the same LAN that
                    630:                 * they came from and is not an indication that the packet
                    631:                 * is being inffluenced by source routing options.  This
                    632:                 * allows things like
                    633:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    634:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    635:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    636:                 * also requires a "map tlp0 ..." to complete the story.
                    637:                 * One might argue whether or not this kind of network config.
1.212     perry     638:                 * should be supported in this manner...
1.205     darrenr   639:                 */
1.169     itojun    640:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    641:        }
1.123     thorpej   642:
                    643: #ifdef ALTQ
                    644:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     645:        if (altq_input) {
                    646:                SOFTNET_LOCK();
                    647:                if ((*altq_input)(m, AF_INET) == 0) {
                    648:                        /* Packet dropped by traffic conditioner. */
                    649:                        SOFTNET_UNLOCK();
1.329     ozaki-r   650:                        goto out;
1.318     rmind     651:                }
                    652:                SOFTNET_UNLOCK();
1.123     thorpej   653:        }
                    654: #endif
1.121     thorpej   655:
                    656:        /*
1.1       cgd       657:         * Process options and, if not destined for us,
                    658:         * ship it on.  ip_dooptions returns 1 when an
                    659:         * error was detected (causing an icmp message
                    660:         * to be sent and the original packet to be freed).
                    661:         */
                    662:        ip_nhops = 0;           /* for source routed packets */
                    663:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.329     ozaki-r   664:                goto out;
1.1       cgd       665:
                    666:        /*
                    667:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    668:         *
                    669:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    670:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       671:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       672:         */
1.100     itojun    673:        downmatch = 0;
1.339     ozaki-r   674:        s = pserialize_read_enter();
1.333     ozaki-r   675:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   676:        if (ia != NULL) {
                    677:                pserialize_read_exit(s);
1.86      thorpej   678:                goto ours;
1.339     ozaki-r   679:        }
1.333     ozaki-r   680:
1.315     christos  681:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   682:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   683:                if (ia != NULL) {
                    684:                        pserialize_read_exit(s);
1.333     ozaki-r   685:                        goto ours;
1.339     ozaki-r   686:                }
1.1       cgd       687:        }
1.339     ozaki-r   688:        pserialize_read_exit(s);
1.333     ozaki-r   689:
1.18      mycroft   690:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   691: #ifdef MROUTING
                    692:                extern struct socket *ip_mrouter;
1.10      brezak    693:
1.4       hpeyerl   694:                if (ip_mrouter) {
                    695:                        /*
                    696:                         * If we are acting as a multicast router, all
                    697:                         * incoming multicast packets are passed to the
                    698:                         * kernel-level multicast forwarding function.
                    699:                         * The packet is returned (relatively) intact; if
                    700:                         * ip_mforward() returns a non-zero value, the packet
                    701:                         * must be discarded, else it may be accepted below.
                    702:                         *
                    703:                         * (The IP ident field is put in the same byte order
                    704:                         * as expected when ip_mforward() is called from
                    705:                         * ip_output().)
                    706:                         */
1.318     rmind     707:                        SOFTNET_LOCK();
1.314     rmind     708:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     709:                                SOFTNET_UNLOCK();
1.266     thorpej   710:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   711:                                goto out;
1.4       hpeyerl   712:                        }
1.318     rmind     713:                        SOFTNET_UNLOCK();
1.4       hpeyerl   714:
                    715:                        /*
                    716:                         * The process-level routing demon needs to receive
                    717:                         * all multicast IGMP packets, whether or not this
                    718:                         * host belongs to their destination groups.
                    719:                         */
1.318     rmind     720:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   721:                                goto ours;
1.318     rmind     722:                        }
1.266     thorpej   723:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   724:                }
                    725: #endif
                    726:                /*
                    727:                 * See if we belong to the destination multicast group on the
                    728:                 * arrival interface.
                    729:                 */
1.316     rmind     730:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   731:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   732:                        goto out;
1.4       hpeyerl   733:                }
                    734:                goto ours;
                    735:        }
1.19      mycroft   736:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   737:            in_nullhost(ip->ip_dst))
1.1       cgd       738:                goto ours;
                    739:
                    740:        /*
                    741:         * Not for us; forward if possible and desirable.
                    742:         */
                    743:        if (ipforwarding == 0) {
1.329     ozaki-r   744:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   745:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       746:                m_freem(m);
1.100     itojun    747:        } else {
                    748:                /*
                    749:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    750:                 * and there's no IFF_UP interface that matches ip_dst,
                    751:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    752:                 * forwarding loop till TTL goes to 0.
                    753:                 */
                    754:                if (downmatch) {
1.329     ozaki-r   755:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    756:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   757:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    758:                        return;
                    759:                }
1.304     christos  760: #ifdef IPSEC
1.305     rmind     761:                /* Perform IPsec, if any. */
1.318     rmind     762:                if (ipsec_used) {
                    763:                        SOFTNET_LOCK();
                    764:                        if (ipsec4_input(m, IP_FORWARDING |
                    765:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    766:                                SOFTNET_UNLOCK();
1.332     ozaki-r   767:                                goto out;
1.318     rmind     768:                        }
                    769:                        SOFTNET_UNLOCK();
1.173     jonathan  770:                }
1.305     rmind     771: #endif
1.329     ozaki-r   772:                ip_forward(m, srcrt, ifp);
                    773:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    774:        }
1.89      itojun    775:        return;
1.1       cgd       776:
                    777: ours:
1.329     ozaki-r   778:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   779:        ifp = NULL;
1.329     ozaki-r   780:
1.1       cgd       781:        /*
                    782:         * If offset or IP_MF are set, must reassemble.
                    783:         */
1.155     itojun    784:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     785:                /*
                    786:                 * Pass to IP reassembly mechanism.
                    787:                 */
1.290     rmind     788:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     789:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   790:                        goto out;
1.16      cgd       791:                }
1.290     rmind     792:                if (m == NULL) {
1.289     rmind     793:                        /* More fragments should come; silently return. */
1.332     ozaki-r   794:                        goto out;
1.289     rmind     795:                }
1.290     rmind     796:                /*
                    797:                 * Reassembly is done, we have the final packet.
                    798:                 * Updated cached data in local variable(s).
                    799:                 */
1.289     rmind     800:                ip = mtod(m, struct ip *);
                    801:                hlen = ip->ip_hl << 2;
1.79      mycroft   802:        }
1.128     itojun    803:
1.304     christos  804: #ifdef IPSEC
1.173     jonathan  805:        /*
1.305     rmind     806:         * Enforce IPsec policy checking if we are seeing last header.
                    807:         * Note that we do not visit this with protocols with PCB layer
                    808:         * code - like UDP/TCP/raw IP.
1.173     jonathan  809:         */
1.317     christos  810:        if (ipsec_used &&
1.328     riastrad  811:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     812:                SOFTNET_LOCK();
1.305     rmind     813:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     814:                        SOFTNET_UNLOCK();
1.332     ozaki-r   815:                        goto out;
1.173     jonathan  816:                }
1.318     rmind     817:                SOFTNET_UNLOCK();
1.173     jonathan  818:        }
1.305     rmind     819: #endif
1.1       cgd       820:
                    821:        /*
                    822:         * Switch out to protocol's input routine.
                    823:         */
1.82      aidan     824: #if IFA_STATS
1.339     ozaki-r   825:        if (ia && ip) {
                    826:                struct in_ifaddr *_ia;
                    827:                /*
                    828:                 * Keep a reference from ip_match_our_address with psref
                    829:                 * is expensive, so explore ia here again.
                    830:                 */
                    831:                s = pserialize_read_enter();
                    832:                _ia = in_get_ia(ip->ip_dst.s_addr);
                    833:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    834:                pserialize_read_exit(s);
                    835:        }
1.82      aidan     836: #endif
1.266     thorpej   837:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    838:
1.318     rmind     839:        const int off = hlen, nh = ip->ip_p;
                    840:
                    841:        SOFTNET_LOCK();
1.328     riastrad  842:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     843:        SOFTNET_UNLOCK();
1.89      itojun    844:        return;
1.135     thorpej   845:
1.329     ozaki-r   846: out:
                    847:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   848:        if (m != NULL)
                    849:                m_freem(m);
1.1       cgd       850: }
                    851:
                    852: /*
1.288     rmind     853:  * IP timer processing.
1.1       cgd       854:  */
1.8       mycroft   855: void
1.211     perry     856: ip_slowtimo(void)
1.1       cgd       857: {
1.268     ad        858:
                    859:        mutex_enter(softnet_lock);
                    860:        KERNEL_LOCK(1, NULL);
1.1       cgd       861:
1.288     rmind     862:        ip_reass_slowtimo();
1.268     ad        863:
                    864:        KERNEL_UNLOCK_ONE(NULL);
                    865:        mutex_exit(softnet_lock);
1.1       cgd       866: }
                    867:
                    868: /*
1.288     rmind     869:  * IP drain processing.
1.1       cgd       870:  */
1.8       mycroft   871: void
1.211     perry     872: ip_drain(void)
1.1       cgd       873: {
                    874:
1.268     ad        875:        KERNEL_LOCK(1, NULL);
1.288     rmind     876:        ip_reass_drain();
1.268     ad        877:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       878: }
                    879:
                    880: /*
1.311     rmind     881:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    882:  * it if bad options are encountered, or forwarding it if source-routed.
                    883:  *
                    884:  * => Returns true if packet has been forwarded/freed.
                    885:  * => Returns false if the packet should be processed further.
1.1       cgd       886:  */
1.311     rmind     887: static bool
1.211     perry     888: ip_dooptions(struct mbuf *m)
1.1       cgd       889: {
1.109     augustss  890:        struct ip *ip = mtod(m, struct ip *);
                    891:        u_char *cp, *cp0;
                    892:        struct ip_timestamp *ipt;
                    893:        struct in_ifaddr *ia;
1.1       cgd       894:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   895:        struct in_addr dst;
1.1       cgd       896:        n_time ntime;
1.339     ozaki-r   897:        struct ifaddr *ifa;
                    898:        int s;
1.1       cgd       899:
1.13      mycroft   900:        dst = ip->ip_dst;
1.1       cgd       901:        cp = (u_char *)(ip + 1);
                    902:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    903:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    904:                opt = cp[IPOPT_OPTVAL];
                    905:                if (opt == IPOPT_EOL)
                    906:                        break;
                    907:                if (opt == IPOPT_NOP)
                    908:                        optlen = 1;
                    909:                else {
1.113     itojun    910:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    911:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    912:                                goto bad;
                    913:                        }
1.1       cgd       914:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    915:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       916:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    917:                                goto bad;
                    918:                        }
                    919:                }
                    920:                switch (opt) {
                    921:
                    922:                default:
                    923:                        break;
                    924:
                    925:                /*
                    926:                 * Source routing with record.
                    927:                 * Find interface with current destination address.
                    928:                 * If none on this machine then drop if strictly routed,
                    929:                 * or do nothing if loosely routed.
                    930:                 * Record interface address and bring up next address
                    931:                 * component.  If strictly routed make sure next
                    932:                 * address is on directly accessible net.
                    933:                 */
                    934:                case IPOPT_LSRR:
                    935:                case IPOPT_SSRR:
1.47      cjs       936:                        if (ip_allowsrcrt == 0) {
                    937:                                type = ICMP_UNREACH;
                    938:                                code = ICMP_UNREACH_NET_PROHIB;
                    939:                                goto bad;
                    940:                        }
1.114     itojun    941:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    942:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    943:                                goto bad;
                    944:                        }
1.1       cgd       945:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    946:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    947:                                goto bad;
                    948:                        }
                    949:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   950:
                    951:                        s = pserialize_read_enter();
                    952:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    953:                        if (ifa == NULL) {
                    954:                                pserialize_read_exit(s);
1.1       cgd       955:                                if (opt == IPOPT_SSRR) {
                    956:                                        type = ICMP_UNREACH;
                    957:                                        code = ICMP_UNREACH_SRCFAIL;
                    958:                                        goto bad;
                    959:                                }
                    960:                                /*
                    961:                                 * Loose routing, and not at next destination
                    962:                                 * yet; nothing to do except forward.
                    963:                                 */
                    964:                                break;
                    965:                        }
1.339     ozaki-r   966:                        pserialize_read_exit(s);
                    967:
1.1       cgd       968:                        off--;                  /* 0 origin */
1.112     sommerfe  969:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       970:                                /*
                    971:                                 * End of source route.  Should be for us.
                    972:                                 */
                    973:                                save_rte(cp, ip->ip_src);
                    974:                                break;
                    975:                        }
                    976:                        /*
                    977:                         * locate outgoing interface
                    978:                         */
1.281     tsutsui   979:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       980:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   981:                        s = pserialize_read_enter();
                    982:                        if (opt == IPOPT_SSRR) {
                    983:                                ifa = ifa_ifwithladdr(sintosa(&ipaddr));
                    984:                                if (ifa != NULL)
                    985:                                        ia = ifatoia(ifa);
                    986:                                else
                    987:                                        ia = NULL;
                    988:                        } else {
1.1       cgd       989:                                ia = ip_rtaddr(ipaddr.sin_addr);
1.339     ozaki-r   990:                        }
                    991:                        if (ia == NULL) {
1.1       cgd       992:                                type = ICMP_UNREACH;
                    993:                                code = ICMP_UNREACH_SRCFAIL;
1.339     ozaki-r   994:                                pserialize_read_exit(s);
1.1       cgd       995:                                goto bad;
                    996:                        }
                    997:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos  998:                        bcopy((void *)&ia->ia_addr.sin_addr,
                    999:                            (void *)(cp + off), sizeof(struct in_addr));
1.339     ozaki-r  1000:                        pserialize_read_exit(s);
1.1       cgd      1001:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1002:                        /*
                   1003:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1004:                         */
1.18      mycroft  1005:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1006:                        break;
                   1007:
                   1008:                case IPOPT_RR:
1.114     itojun   1009:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1010:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1011:                                goto bad;
                   1012:                        }
1.1       cgd      1013:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1014:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1015:                                goto bad;
                   1016:                        }
                   1017:                        /*
                   1018:                         * If no space remains, ignore.
                   1019:                         */
                   1020:                        off--;                  /* 0 origin */
1.112     sommerfe 1021:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1022:                                break;
1.281     tsutsui  1023:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1024:                            sizeof(ipaddr.sin_addr));
                   1025:                        /*
                   1026:                         * locate outgoing interface; if we're the destination,
                   1027:                         * use the incoming interface (should be same).
                   1028:                         */
1.339     ozaki-r  1029:                        s = pserialize_read_enter();
                   1030:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1031:                        if (ifa == NULL) {
                   1032:                                ia = ip_rtaddr(ipaddr.sin_addr);
                   1033:                                if (ia == NULL) {
                   1034:                                        pserialize_read_exit(s);
                   1035:                                        type = ICMP_UNREACH;
                   1036:                                        code = ICMP_UNREACH_HOST;
                   1037:                                        goto bad;
                   1038:                                }
                   1039:                        } else {
                   1040:                                ia = ifatoia(ifa);
1.1       cgd      1041:                        }
1.244     christos 1042:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1043:                            (void *)(cp + off), sizeof(struct in_addr));
1.339     ozaki-r  1044:                        pserialize_read_exit(s);
1.1       cgd      1045:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1046:                        break;
                   1047:
                   1048:                case IPOPT_TS:
                   1049:                        code = cp - (u_char *)ip;
                   1050:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1051:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1052:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1053:                                goto bad;
1.114     itojun   1054:                        }
                   1055:                        if (ipt->ipt_ptr < 5) {
                   1056:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1057:                                goto bad;
                   1058:                        }
1.15      cgd      1059:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1060:                                if (++ipt->ipt_oflw == 0) {
                   1061:                                        code = (u_char *)&ipt->ipt_ptr -
                   1062:                                            (u_char *)ip;
1.1       cgd      1063:                                        goto bad;
1.114     itojun   1064:                                }
1.1       cgd      1065:                                break;
                   1066:                        }
1.104     thorpej  1067:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1068:                        switch (ipt->ipt_flg) {
                   1069:
                   1070:                        case IPOPT_TS_TSONLY:
                   1071:                                break;
                   1072:
1.329     ozaki-r  1073:                        case IPOPT_TS_TSANDADDR: {
                   1074:                                struct ifnet *rcvif;
1.339     ozaki-r  1075:                                int _s, _ss;
1.329     ozaki-r  1076:
1.66      thorpej  1077:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1078:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1079:                                        code = (u_char *)&ipt->ipt_ptr -
                   1080:                                            (u_char *)ip;
1.1       cgd      1081:                                        goto bad;
1.114     itojun   1082:                                }
1.13      mycroft  1083:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1084:                                _ss = pserialize_read_enter();
                   1085:                                rcvif = m_get_rcvif(m, &_s);
                   1086:                                ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif);
                   1087:                                m_put_rcvif(rcvif, &_s);
                   1088:                                if (ifa == NULL) {
                   1089:                                        pserialize_read_exit(_ss);
                   1090:                                        break;
                   1091:                                }
                   1092:                                ia = ifatoia(ifa);
1.104     thorpej  1093:                                bcopy(&ia->ia_addr.sin_addr,
                   1094:                                    cp0, sizeof(struct in_addr));
1.339     ozaki-r  1095:                                pserialize_read_exit(_ss);
1.1       cgd      1096:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1097:                                break;
1.329     ozaki-r  1098:                        }
1.1       cgd      1099:
                   1100:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1101:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1102:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1103:                                        code = (u_char *)&ipt->ipt_ptr -
                   1104:                                            (u_char *)ip;
1.1       cgd      1105:                                        goto bad;
1.114     itojun   1106:                                }
1.281     tsutsui  1107:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1108:                                    sizeof(struct in_addr));
1.339     ozaki-r  1109:                                s = pserialize_read_enter();
                   1110:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1111:                                if (ifa == NULL) {
                   1112:                                        pserialize_read_exit(s);
1.1       cgd      1113:                                        continue;
1.339     ozaki-r  1114:                                }
                   1115:                                pserialize_read_exit(s);
1.1       cgd      1116:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1117:                                break;
                   1118:
                   1119:                        default:
1.114     itojun   1120:                                /* XXX can't take &ipt->ipt_flg */
                   1121:                                code = (u_char *)&ipt->ipt_ptr -
                   1122:                                    (u_char *)ip + 1;
1.1       cgd      1123:                                goto bad;
                   1124:                        }
                   1125:                        ntime = iptime();
1.107     thorpej  1126:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1127:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1128:                            sizeof(n_time));
                   1129:                        ipt->ipt_ptr += sizeof(n_time);
                   1130:                }
                   1131:        }
                   1132:        if (forward) {
1.329     ozaki-r  1133:                struct ifnet *rcvif;
1.339     ozaki-r  1134:                struct psref _psref;
1.329     ozaki-r  1135:
1.26      thorpej  1136:                if (ip_forwsrcrt == 0) {
                   1137:                        type = ICMP_UNREACH;
                   1138:                        code = ICMP_UNREACH_SRCFAIL;
                   1139:                        goto bad;
                   1140:                }
1.329     ozaki-r  1141:
1.339     ozaki-r  1142:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1143:                if (__predict_false(rcvif == NULL)) {
                   1144:                        type = ICMP_UNREACH;
                   1145:                        code = ICMP_UNREACH_HOST;
                   1146:                        goto bad;
                   1147:                }
1.329     ozaki-r  1148:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1149:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1150:                return true;
1.13      mycroft  1151:        }
1.311     rmind    1152:        return false;
1.1       cgd      1153: bad:
1.13      mycroft  1154:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1155:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1156:        return true;
1.1       cgd      1157: }
                   1158:
                   1159: /*
1.311     rmind    1160:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1161:  * return internet address info of interface to be used to get there.
                   1162:  */
1.311     rmind    1163: static struct in_ifaddr *
1.211     perry    1164: ip_rtaddr(struct in_addr dst)
1.1       cgd      1165: {
1.249     dyoung   1166:        struct rtentry *rt;
                   1167:        union {
                   1168:                struct sockaddr         dst;
                   1169:                struct sockaddr_in      dst4;
                   1170:        } u;
1.340     ozaki-r  1171:        struct route *ro;
1.249     dyoung   1172:
                   1173:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1174:
1.318     rmind    1175:        SOFTNET_LOCK();
1.340     ozaki-r  1176:        ro = percpu_getref(ipforward_rt_percpu);
                   1177:        rt = rtcache_lookup(ro, &u.dst);
                   1178:        percpu_putref(ipforward_rt_percpu);
1.318     rmind    1179:        SOFTNET_UNLOCK();
                   1180:        if (rt == NULL)
1.249     dyoung   1181:                return NULL;
                   1182:
                   1183:        return ifatoia(rt->rt_ifa);
1.1       cgd      1184: }
                   1185:
                   1186: /*
1.311     rmind    1187:  * save_rte: save incoming source route for use in replies, to be picked
                   1188:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1189:  */
1.311     rmind    1190: static void
1.211     perry    1191: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1192: {
                   1193:        unsigned olen;
                   1194:
                   1195:        olen = option[IPOPT_OLEN];
                   1196:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1197:                return;
1.281     tsutsui  1198:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1199:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1200:        ip_srcrt.dst = dst;
                   1201: }
                   1202:
                   1203: /*
                   1204:  * Retrieve incoming source route for use in replies,
                   1205:  * in the same form used by setsockopt.
                   1206:  * The first hop is placed before the options, will be removed later.
                   1207:  */
                   1208: struct mbuf *
1.211     perry    1209: ip_srcroute(void)
1.1       cgd      1210: {
1.109     augustss 1211:        struct in_addr *p, *q;
                   1212:        struct mbuf *m;
1.1       cgd      1213:
                   1214:        if (ip_nhops == 0)
1.237     dyoung   1215:                return NULL;
1.1       cgd      1216:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1217:        if (m == 0)
1.237     dyoung   1218:                return NULL;
1.1       cgd      1219:
1.164     matt     1220:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1221: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1222:
                   1223:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1224:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1225:            OPTSIZ;
                   1226:
                   1227:        /*
                   1228:         * First save first hop for return route
                   1229:         */
                   1230:        p = &ip_srcrt.route[ip_nhops - 1];
                   1231:        *(mtod(m, struct in_addr *)) = *p--;
                   1232:
                   1233:        /*
                   1234:         * Copy option fields and padding (nop) to mbuf.
                   1235:         */
                   1236:        ip_srcrt.nop = IPOPT_NOP;
                   1237:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1238:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1239:            OPTSIZ);
                   1240:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1241:            sizeof(struct in_addr) + OPTSIZ);
                   1242: #undef OPTSIZ
                   1243:        /*
                   1244:         * Record return path as an IP source route,
                   1245:         * reversing the path (pointers are now aligned).
                   1246:         */
                   1247:        while (p >= ip_srcrt.route) {
                   1248:                *q++ = *p--;
                   1249:        }
                   1250:        /*
                   1251:         * Last hop goes to final destination.
                   1252:         */
                   1253:        *q = ip_srcrt.dst;
                   1254:        return (m);
                   1255: }
                   1256:
1.139     matt     1257: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1258:        [PRC_MSGSIZE] = EMSGSIZE,
                   1259:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1260:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1261:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1262:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1263:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1264:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1265:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1266:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1267: };
                   1268:
1.295     dyoung   1269: void
                   1270: ip_fasttimo(void)
                   1271: {
                   1272:        if (ip_drainwanted) {
                   1273:                ip_drain();
                   1274:                ip_drainwanted = 0;
                   1275:        }
                   1276: }
                   1277:
                   1278: void
                   1279: ip_drainstub(void)
                   1280: {
                   1281:        ip_drainwanted = 1;
                   1282: }
                   1283:
1.1       cgd      1284: /*
                   1285:  * Forward a packet.  If some error occurs return the sender
                   1286:  * an icmp packet.  Note we can't always generate a meaningful
                   1287:  * icmp message because icmp doesn't have a large enough repertoire
                   1288:  * of codes and types.
                   1289:  *
                   1290:  * If not forwarding, just drop the packet.  This could be confusing
                   1291:  * if ipforwarding was zero but some routing protocol was advancing
                   1292:  * us as a gateway to somewhere.  However, we must let the routing
                   1293:  * protocol deal with that.
                   1294:  *
                   1295:  * The srcrt parameter indicates whether the packet is being forwarded
                   1296:  * via a source route.
                   1297:  */
1.313     rmind    1298: static void
1.329     ozaki-r  1299: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1300: {
1.109     augustss 1301:        struct ip *ip = mtod(m, struct ip *);
                   1302:        struct rtentry *rt;
1.220     christos 1303:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1304:        struct mbuf *mcopy;
1.13      mycroft  1305:        n_long dest;
1.249     dyoung   1306:        union {
                   1307:                struct sockaddr         dst;
                   1308:                struct sockaddr_in      dst4;
                   1309:        } u;
1.320     ozaki-r  1310:        uint64_t *ips;
1.340     ozaki-r  1311:        struct route *ro;
1.164     matt     1312:
1.318     rmind    1313:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1314:            "interrupt handler; synchronization assumptions violated");
                   1315:
1.164     matt     1316:        /*
                   1317:         * We are now in the output path.
                   1318:         */
                   1319:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1320:
                   1321:        /*
                   1322:         * Clear any in-bound checksum flags for this packet.
                   1323:         */
                   1324:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1325:
1.13      mycroft  1326:        dest = 0;
1.93      sommerfe 1327:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1328:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1329:                m_freem(m);
                   1330:                return;
                   1331:        }
1.318     rmind    1332:
                   1333:        SOFTNET_LOCK();
                   1334:
1.1       cgd      1335:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1336:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318     rmind    1337:                SOFTNET_UNLOCK();
1.1       cgd      1338:                return;
                   1339:        }
                   1340:
1.249     dyoung   1341:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1342:
1.340     ozaki-r  1343:        ro = percpu_getref(ipforward_rt_percpu);
                   1344:        if ((rt = rtcache_lookup(ro, &u.dst)) == NULL) {
                   1345:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1346:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318     rmind    1347:                SOFTNET_UNLOCK();
1.249     dyoung   1348:                return;
1.1       cgd      1349:        }
                   1350:
                   1351:        /*
1.34      mycroft  1352:         * Save at most 68 bytes of the packet in case
1.1       cgd      1353:         * we need to generate an ICMP message to the src.
1.119     itojun   1354:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1355:         */
1.155     itojun   1356:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1357:        if (mcopy)
                   1358:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1359:
1.221     christos 1360:        ip->ip_ttl -= IPTTLDEC;
                   1361:
1.1       cgd      1362:        /*
                   1363:         * If forwarding packet using same interface that it came in on,
                   1364:         * perhaps should send a redirect to sender to shortcut a hop.
                   1365:         * Only send redirect if source is sending directly to us,
                   1366:         * and if packet was not source routed (or has any options).
                   1367:         * Also, don't send redirect if forwarding using a default route
                   1368:         * or a route modified by a redirect.
                   1369:         */
1.329     ozaki-r  1370:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1371:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1372:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1373:            ipsendredirects && !srcrt) {
1.19      mycroft  1374:                if (rt->rt_ifa &&
                   1375:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1376:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1377:                        if (rt->rt_flags & RTF_GATEWAY)
                   1378:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1379:                        else
                   1380:                                dest = ip->ip_dst.s_addr;
                   1381:                        /*
                   1382:                         * Router requirements says to only send host
                   1383:                         * redirects.
                   1384:                         */
                   1385:                        type = ICMP_REDIRECT;
                   1386:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1387:                }
                   1388:        }
                   1389:
1.340     ozaki-r  1390:        error = ip_output(m, NULL, ro,
1.173     jonathan 1391:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1392:            NULL, NULL);
1.173     jonathan 1393:
1.320     ozaki-r  1394:        if (error) {
1.266     thorpej  1395:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1396:                goto error;
                   1397:        }
                   1398:
                   1399:        ips = IP_STAT_GETREF();
                   1400:        ips[IP_STAT_FORWARD]++;
                   1401:
                   1402:        if (type) {
                   1403:                ips[IP_STAT_REDIRECTSENT]++;
                   1404:                IP_STAT_PUTREF();
                   1405:                goto redirect;
                   1406:        }
                   1407:
                   1408:        IP_STAT_PUTREF();
                   1409:        if (mcopy) {
1.63      matt     1410: #ifdef GATEWAY
1.320     ozaki-r  1411:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1412:                        ipflow_create(ro, mcopy);
1.63      matt     1413: #endif
1.320     ozaki-r  1414:                m_freem(mcopy);
1.1       cgd      1415:        }
1.320     ozaki-r  1416:
1.340     ozaki-r  1417:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1418:        SOFTNET_UNLOCK();
                   1419:        return;
                   1420:
                   1421: redirect:
                   1422: error:
1.318     rmind    1423:        if (mcopy == NULL) {
1.340     ozaki-r  1424:                percpu_putref(ipforward_rt_percpu);
1.318     rmind    1425:                SOFTNET_UNLOCK();
1.1       cgd      1426:                return;
1.318     rmind    1427:        }
1.13      mycroft  1428:
1.1       cgd      1429:        switch (error) {
                   1430:
                   1431:        case 0:                         /* forwarded, but need redirect */
                   1432:                /* type, code set above */
                   1433:                break;
                   1434:
                   1435:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1436:        case EHOSTUNREACH:
                   1437:        case ENETDOWN:
                   1438:        case EHOSTDOWN:
                   1439:        default:
                   1440:                type = ICMP_UNREACH;
                   1441:                code = ICMP_UNREACH_HOST;
                   1442:                break;
                   1443:
                   1444:        case EMSGSIZE:
                   1445:                type = ICMP_UNREACH;
                   1446:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1447:
1.340     ozaki-r  1448:                if ((rt = rtcache_validate(ro)) != NULL)
1.274     seanb    1449:                        destmtu = rt->rt_ifp->if_mtu;
1.305     rmind    1450: #ifdef IPSEC
1.317     christos 1451:                if (ipsec_used)
                   1452:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1453: #endif
1.266     thorpej  1454:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1455:                break;
                   1456:
                   1457:        case ENOBUFS:
1.143     itojun   1458:                /*
1.311     rmind    1459:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1460:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1461:                 * big problem under DoS attacks or if the underlying
                   1462:                 * interface is rate-limited.
1.143     itojun   1463:                 */
                   1464:                if (mcopy)
                   1465:                        m_freem(mcopy);
1.340     ozaki-r  1466:                percpu_putref(ipforward_rt_percpu);
1.318     rmind    1467:                SOFTNET_UNLOCK();
1.143     itojun   1468:                return;
1.1       cgd      1469:        }
1.220     christos 1470:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1471:        percpu_putref(ipforward_rt_percpu);
1.318     rmind    1472:        SOFTNET_UNLOCK();
1.44      thorpej  1473: }
                   1474:
                   1475: void
1.211     perry    1476: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1477:     struct mbuf *m)
1.44      thorpej  1478: {
1.311     rmind    1479:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1480:        ifnet_t *ifp;
1.311     rmind    1481:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1482:        struct psref psref;
1.44      thorpej  1483:
1.329     ozaki-r  1484:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1485:        if (__predict_false(ifp == NULL))
                   1486:                return; /* XXX should report error? */
                   1487:
1.311     rmind    1488:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1489: #ifdef SO_OTIMESTAMP
1.311     rmind    1490:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1491: #endif
                   1492:            ) {
1.44      thorpej  1493:                struct timeval tv;
                   1494:
                   1495:                microtime(&tv);
1.278     christos 1496: #ifdef SO_OTIMESTAMP
1.311     rmind    1497:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1498:                        struct timeval50 tv50;
                   1499:                        timeval_to_timeval50(&tv, &tv50);
                   1500:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1501:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1502:                } else
                   1503: #endif
1.244     christos 1504:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1505:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1506:                if (*mp)
                   1507:                        mp = &(*mp)->m_next;
                   1508:        }
1.311     rmind    1509:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1510:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1511:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1512:                if (*mp)
                   1513:                        mp = &(*mp)->m_next;
                   1514:        }
1.311     rmind    1515:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1516:                struct in_pktinfo ipi;
1.307     christos 1517:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1518:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1519:                *mp = sbcreatecontrol((void *) &ipi,
                   1520:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1521:                if (*mp)
                   1522:                        mp = &(*mp)->m_next;
                   1523:        }
1.311     rmind    1524:        if (inpflags & INP_PKTINFO) {
1.306     christos 1525:                struct in_pktinfo ipi;
1.307     christos 1526:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1527:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1528:                *mp = sbcreatecontrol((void *) &ipi,
                   1529:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1530:                if (*mp)
                   1531:                        mp = &(*mp)->m_next;
                   1532:        }
1.311     rmind    1533:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1534:                struct sockaddr_dl sdl;
                   1535:
1.337     ozaki-r  1536:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1537:                    NULL, 0);
1.251     dyoung   1538:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1539:                if (*mp)
                   1540:                        mp = &(*mp)->m_next;
                   1541:        }
1.311     rmind    1542:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1543:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1544:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1545:                if (*mp)
                   1546:                        mp = &(*mp)->m_next;
                   1547:        }
1.329     ozaki-r  1548:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1549: }
                   1550:
1.189     atatat   1551: /*
1.228     elad     1552:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1553:  */
                   1554: static int
                   1555: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1556: {
                   1557:        int error, tmp;
                   1558:        struct sysctlnode node;
                   1559:
                   1560:        node = *rnode;
                   1561:        tmp = ip_forwsrcrt;
                   1562:        node.sysctl_data = &tmp;
                   1563:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1564:        if (error || newp == NULL)
                   1565:                return (error);
                   1566:
1.280     elad     1567:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1568:            0, NULL, NULL, NULL);
                   1569:        if (error)
                   1570:                return (error);
1.228     elad     1571:
                   1572:        ip_forwsrcrt = tmp;
                   1573:
                   1574:        return (0);
                   1575: }
                   1576:
                   1577: /*
1.189     atatat   1578:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1579:  * range of the new value and tweaks timers if it changes.
                   1580:  */
                   1581: static int
                   1582: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1583: {
1.189     atatat   1584:        int error, tmp;
                   1585:        struct sysctlnode node;
                   1586:
                   1587:        node = *rnode;
                   1588:        tmp = ip_mtudisc_timeout;
                   1589:        node.sysctl_data = &tmp;
                   1590:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1591:        if (error || newp == NULL)
                   1592:                return (error);
                   1593:        if (tmp < 0)
                   1594:                return (EINVAL);
1.52      thorpej  1595:
1.273     matt     1596:        mutex_enter(softnet_lock);
                   1597:
1.189     atatat   1598:        ip_mtudisc_timeout = tmp;
                   1599:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1600:
1.273     matt     1601:        mutex_exit(softnet_lock);
                   1602:
1.189     atatat   1603:        return (0);
                   1604: }
1.54      lukem    1605:
1.266     thorpej  1606: static int
                   1607: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1608: {
                   1609:
1.271     thorpej  1610:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1611: }
1.131     itojun   1612:
1.284     pooka    1613: static void
                   1614: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1615: {
1.197     atatat   1616:        sysctl_createv(clog, 0, NULL, NULL,
                   1617:                       CTLFLAG_PERMANENT,
1.203     atatat   1618:                       CTLTYPE_NODE, "inet",
                   1619:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1620:                       NULL, 0, NULL, 0,
                   1621:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1622:        sysctl_createv(clog, 0, NULL, NULL,
                   1623:                       CTLFLAG_PERMANENT,
1.203     atatat   1624:                       CTLTYPE_NODE, "ip",
                   1625:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1626:                       NULL, 0, NULL, 0,
                   1627:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1628:
1.197     atatat   1629:        sysctl_createv(clog, 0, NULL, NULL,
                   1630:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1631:                       CTLTYPE_INT, "forwarding",
                   1632:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1633:                       NULL, 0, &ipforwarding, 0,
                   1634:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1635:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1636:        sysctl_createv(clog, 0, NULL, NULL,
                   1637:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1638:                       CTLTYPE_INT, "redirect",
                   1639:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1640:                       NULL, 0, &ipsendredirects, 0,
                   1641:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1642:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1645:                       CTLTYPE_INT, "ttl",
                   1646:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1647:                       NULL, 0, &ip_defttl, 0,
                   1648:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1649:                       IPCTL_DEFTTL, CTL_EOL);
                   1650: #ifdef IPCTL_DEFMTU
1.197     atatat   1651:        sysctl_createv(clog, 0, NULL, NULL,
                   1652:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1653:                       CTLTYPE_INT, "mtu",
                   1654:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1655:                       NULL, 0, &ip_mtu, 0,
                   1656:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1657:                       IPCTL_DEFMTU, CTL_EOL);
                   1658: #endif /* IPCTL_DEFMTU */
1.197     atatat   1659:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1660:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1661:                       CTLTYPE_INT, "forwsrcrt",
                   1662:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1663:                                    "datagrams"),
1.228     elad     1664:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1665:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1666:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1667:        sysctl_createv(clog, 0, NULL, NULL,
                   1668:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1669:                       CTLTYPE_INT, "directed-broadcast",
                   1670:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1671:                       NULL, 0, &ip_directedbcast, 0,
                   1672:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1673:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1674:        sysctl_createv(clog, 0, NULL, NULL,
                   1675:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1676:                       CTLTYPE_INT, "allowsrcrt",
                   1677:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1678:                       NULL, 0, &ip_allowsrcrt, 0,
                   1679:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1680:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1681:
1.197     atatat   1682:        sysctl_createv(clog, 0, NULL, NULL,
                   1683:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1684:                       CTLTYPE_INT, "mtudisc",
                   1685:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1686:                       NULL, 0, &ip_mtudisc, 0,
                   1687:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1688:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1689:        sysctl_createv(clog, 0, NULL, NULL,
                   1690:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1691:                       CTLTYPE_INT, "anonportmin",
                   1692:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1693:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1694:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1695:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1696:        sysctl_createv(clog, 0, NULL, NULL,
                   1697:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1698:                       CTLTYPE_INT, "anonportmax",
                   1699:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1700:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1701:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1702:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1703:        sysctl_createv(clog, 0, NULL, NULL,
                   1704:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1705:                       CTLTYPE_INT, "mtudisctimeout",
                   1706:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1707:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1708:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1709:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1710: #ifndef IPNOPRIVPORTS
1.197     atatat   1711:        sysctl_createv(clog, 0, NULL, NULL,
                   1712:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1713:                       CTLTYPE_INT, "lowportmin",
                   1714:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1715:                                    "to assign"),
1.189     atatat   1716:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1717:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1718:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1719:        sysctl_createv(clog, 0, NULL, NULL,
                   1720:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1721:                       CTLTYPE_INT, "lowportmax",
                   1722:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1723:                                    "to assign"),
1.189     atatat   1724:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1725:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1726:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1727: #endif /* IPNOPRIVPORTS */
                   1728: #if NGRE > 0
1.197     atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1731:                       CTLTYPE_INT, "grettl",
                   1732:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1733:                       NULL, 0, &ip_gre_ttl, 0,
                   1734:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1735:                       IPCTL_GRE_TTL, CTL_EOL);
                   1736: #endif /* NGRE */
1.197     atatat   1737:        sysctl_createv(clog, 0, NULL, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1739:                       CTLTYPE_INT, "checkinterface",
                   1740:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1741:                                    "from RFC1122"),
1.189     atatat   1742:                       NULL, 0, &ip_checkinterface, 0,
                   1743:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1744:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1745:        sysctl_createv(clog, 0, NULL, NULL,
                   1746:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1747:                       CTLTYPE_INT, "random_id",
                   1748:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1749:                       NULL, 0, &ip_do_randomid, 0,
                   1750:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1751:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1752:        sysctl_createv(clog, 0, NULL, NULL,
                   1753:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1754:                       CTLTYPE_INT, "do_loopback_cksum",
                   1755:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1756:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1757:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1758:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1759:        sysctl_createv(clog, 0, NULL, NULL,
                   1760:                       CTLFLAG_PERMANENT,
                   1761:                       CTLTYPE_STRUCT, "stats",
                   1762:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1763:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1764:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1765:                       CTL_EOL);
1.322     joerg    1766: #if NARP
1.321     roy      1767:        sysctl_createv(clog, 0, NULL, NULL,
                   1768:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1769:                       CTLTYPE_INT, "dad_count",
                   1770:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1771:                                    "probes to send"),
                   1772:                       NULL, 0, &ip_dad_count, 0,
                   1773:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1774:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1775: #endif
1.301     christos 1776:
                   1777:        /* anonportalgo RFC6056 subtree */
1.302     christos 1778:        const struct sysctlnode *portalgo_node;
                   1779:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1780:                       CTLFLAG_PERMANENT,
                   1781:                       CTLTYPE_NODE, "anonportalgo",
                   1782:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1783:                       NULL, 0, NULL, 0,
                   1784:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1785:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1786:                       CTLFLAG_PERMANENT,
                   1787:                       CTLTYPE_STRING, "available",
                   1788:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1789:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1790:                       CTL_CREATE, CTL_EOL);
1.302     christos 1791:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1792:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1793:                       CTLTYPE_STRING, "selected",
                   1794:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1795:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1796:                       CTL_CREATE, CTL_EOL);
                   1797:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1798:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1799:                       CTLTYPE_STRUCT, "reserve",
                   1800:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1801:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1802:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1803: }
1.266     thorpej  1804:
                   1805: void
                   1806: ip_statinc(u_int stat)
                   1807: {
                   1808:
                   1809:        KASSERT(stat < IP_NSTATS);
                   1810:        IP_STATINC(stat);
                   1811: }

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