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Annotation of src/sys/netinet/ip_input.c, Revision 1.396

1.396   ! ozaki-r     1: /*     $NetBSD: ip_input.c,v 1.395 2020/08/28 06:20:44 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:
1.365     maxv       32: /*
1.76      thorpej    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>
1.396   ! ozaki-r    94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.395 2020/08/28 06:20:44 ozaki-r Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.62      matt       98: #include "opt_gateway.h"
1.91      thorpej    99: #include "opt_ipsec.h"
1.55      scottr    100: #include "opt_mrouting.h"
1.167     martin    101: #include "opt_mbuftrace.h"
1.135     thorpej   102: #include "opt_inet_csum.h"
1.344     ozaki-r   103: #include "opt_net_mpsafe.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 */
1.370     maxv      156: #else
1.1       cgd       157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
1.370     maxv      158: #endif
                    159: #endif
                    160:
1.61      kml       161: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.53      kml       162:
1.370     maxv      163: int ipforwarding = IPFORWARDING;
1.372     maxv      164: int ipsendredirects = 1;
1.370     maxv      165: int ip_defttl = IPDEFTTL;
                    166: int ip_forwsrcrt = 0;
1.371     maxv      167: int ip_directedbcast = 0;
1.370     maxv      168: int ip_allowsrcrt = 0;
                    169: int ip_mtudisc = 1;
                    170: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
                    171: int ip_do_randomid = 0;
1.184     jonathan  172:
1.165     christos  173: /*
                    174:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    175:  * the Strong ES model described in RFC 1122, but since the routing table
                    176:  * and transmit implementation do not implement the Strong ES model,
                    177:  * setting this to 1 results in an odd hybrid.
                    178:  *
1.386     maxv      179:  * XXX - ip_checkinterface currently must be disabled if you use NAT
1.165     christos  180:  * to translate the destination address to another local interface.
                    181:  *
                    182:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    183:  * to the loopback interface instead of the interface where the
                    184:  * packets for those addresses are received.
                    185:  */
1.318     rmind     186: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  187:
1.60      kml       188: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    189:
1.318     rmind     190: pktqueue_t *           ip_pktq                 __read_mostly;
                    191: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    192: ipid_state_t *         ip_ids                  __read_mostly;
                    193: percpu_t *             ipstat_percpu           __read_mostly;
                    194:
1.340     ozaki-r   195: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       196:
1.183     jonathan  197: uint16_t ip_id;
1.75      thorpej   198:
1.135     thorpej   199: #ifdef INET_CSUM_COUNTERS
                    200: #include <sys/device.h>
                    201:
                    202: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    203:     NULL, "inet", "hwcsum bad");
                    204: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    205:     NULL, "inet", "hwcsum ok");
                    206: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    207:     NULL, "inet", "swcsum");
                    208:
                    209: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    210:
1.201     matt      211: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    212: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    213: EVCNT_ATTACH_STATIC(ip_swcsum);
                    214:
1.135     thorpej   215: #else
                    216:
                    217: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    218:
                    219: #endif /* INET_CSUM_COUNTERS */
                    220:
1.1       cgd       221: /*
1.354     ozaki-r   222:  * Used to save the IP options in case a protocol wants to respond
1.1       cgd       223:  * to an incoming packet over the same route if the packet got here
                    224:  * using IP source routing.  This allows connection establishment and
                    225:  * maintenance when the remote end is on a network that is not known
                    226:  * to us.
                    227:  */
1.354     ozaki-r   228: struct ip_srcrt {
                    229:        int             isr_nhops;                 /* number of hops */
                    230:        struct in_addr  isr_dst;                   /* final destination */
                    231:        char            isr_nop;                   /* one NOP to align */
                    232:        char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
                    233:        struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    234: };
1.1       cgd       235:
1.295     dyoung    236: static int ip_drainwanted;
                    237:
1.354     ozaki-r   238: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35      mycroft   239:
1.164     matt      240: #ifdef MBUFTRACE
1.234     dogcow    241: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    242: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      243: #endif
                    244:
1.318     rmind     245: static void            ipintr(void *);
1.396   ! ozaki-r   246: static void            ip_input(struct mbuf *, struct ifnet *);
1.329     ozaki-r   247: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     248: static bool            ip_dooptions(struct mbuf *);
1.346     ozaki-r   249: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     250: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     251:
1.333     ozaki-r   252: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    253:                            int *);
                    254: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    255:                            struct ip *);
                    256:
1.344     ozaki-r   257: #ifdef NET_MPSAFE
                    258: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    259: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    260: #else
1.318     rmind     261: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    262: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.344     ozaki-r   263: #endif
1.318     rmind     264:
1.1       cgd       265: /*
                    266:  * IP initialization: fill in IP protocol switch table.
                    267:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    268:  */
1.8       mycroft   269: void
1.211     perry     270: ip_init(void)
1.1       cgd       271: {
1.199     matt      272:        const struct protosw *pr;
1.1       cgd       273:
1.311     rmind     274:        in_init();
1.284     pooka     275:        sysctl_net_inet_ip_setup(NULL);
                    276:
1.311     rmind     277:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    278:        KASSERT(pr != NULL);
1.275     pooka     279:
1.319     ozaki-r   280:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     281:        KASSERT(ip_pktq != NULL);
                    282:
1.328     riastrad  283:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    284:                ip_protox[i] = pr - inetsw;
1.311     rmind     285:        }
1.328     riastrad  286:        for (pr = inetdomain.dom_protosw;
                    287:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       288:                if (pr->pr_domain->dom_family == PF_INET &&
                    289:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  290:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  291:
1.288     rmind     292:        ip_reass_init();
1.190     jonathan  293:
1.291     rmind     294:        ip_ids = ip_id_init();
1.323     ozaki-r   295:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  296:
1.73      thorpej   297: #ifdef GATEWAY
1.311     rmind     298:        ipflow_init();
1.73      thorpej   299: #endif
1.121     thorpej   300:
                    301:        /* Register our Packet Filter hook. */
1.308     rmind     302:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    303:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   304:
1.164     matt      305: #ifdef MBUFTRACE
                    306:        MOWNER_ATTACH(&ip_tx_mowner);
                    307:        MOWNER_ATTACH(&ip_rx_mowner);
1.373     maxv      308: #endif
1.266     thorpej   309:
                    310:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.391     ozaki-r   311:        ipforward_rt_percpu = rtcache_percpu_alloc();
1.352     ozaki-r   312:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       313: }
                    314:
1.333     ozaki-r   315: static struct in_ifaddr *
                    316: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    317: {
                    318:        struct in_ifaddr *ia = NULL;
                    319:        int checkif;
                    320:
                    321:        /*
                    322:         * Enable a consistency check between the destination address
                    323:         * and the arrival interface for a unicast packet (the RFC 1122
                    324:         * strong ES model) if IP forwarding is disabled and the packet
                    325:         * is not locally generated.
                    326:         *
                    327:         * XXX - We need to add a per ifaddr flag for this so that
                    328:         * we get finer grain control.
                    329:         */
                    330:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    331:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    332:
1.334     ozaki-r   333:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   334:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    335:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    336:                                continue;
                    337:                        if (checkif && ia->ia_ifp != ifp)
                    338:                                continue;
1.363     roy       339:                        if ((ia->ia_ifp->if_flags & IFF_UP) == 0) {
1.338     ozaki-r   340:                                (*downmatch)++;
1.363     roy       341:                                continue;
                    342:                        }
                    343:                        if (ia->ia4_flags & IN_IFF_DETACHED &&
                    344:                            (ifp->if_flags & IFF_LOOPBACK) == 0)
                    345:                                continue;
                    346:                        break;
1.333     ozaki-r   347:                }
                    348:        }
                    349:
                    350:        return ia;
                    351: }
                    352:
                    353: static struct in_ifaddr *
                    354: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    355: {
                    356:        struct in_ifaddr *ia = NULL;
                    357:        struct ifaddr *ifa;
                    358:
1.336     ozaki-r   359:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   360:                if (ifa->ifa_addr->sa_family != AF_INET)
                    361:                        continue;
                    362:                ia = ifatoia(ifa);
1.363     roy       363:                if (ia->ia4_flags & IN_IFF_NOTREADY)
                    364:                        continue;
                    365:                if (ia->ia4_flags & IN_IFF_DETACHED &&
                    366:                    (ifp->if_flags & IFF_LOOPBACK) == 0)
1.333     ozaki-r   367:                        continue;
                    368:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    369:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    370:                    /*
                    371:                     * Look for all-0's host part (old broadcast addr),
                    372:                     * either for subnet or net.
                    373:                     */
                    374:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    375:                    ip->ip_dst.s_addr == ia->ia_net)
                    376:                        goto matched;
                    377:                /*
                    378:                 * An interface with IP address zero accepts
                    379:                 * all packets that arrive on that interface.
                    380:                 */
                    381:                if (in_nullhost(ia->ia_addr.sin_addr))
                    382:                        goto matched;
                    383:        }
                    384:        ia = NULL;
                    385:
                    386: matched:
                    387:        return ia;
                    388: }
                    389:
1.1       cgd       390: /*
1.318     rmind     391:  * IP software interrupt routine.
1.89      itojun    392:  */
1.318     rmind     393: static void
                    394: ipintr(void *arg __unused)
1.89      itojun    395: {
                    396:        struct mbuf *m;
1.286     tls       397:
1.318     rmind     398:        KASSERT(cpu_softintr_p());
1.89      itojun    399:
1.376     ozaki-r   400:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.318     rmind     401:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.396   ! ozaki-r   402:                struct ifnet *ifp;
        !           403:                struct psref psref;
        !           404:
        !           405:                ifp = m_get_rcvif_psref(m, &psref);
        !           406:                if (__predict_false(ifp == NULL)) {
        !           407:                        m_freem(m);
        !           408:                        continue;
        !           409:                }
        !           410:
        !           411:                ip_input(m, ifp);
        !           412:
        !           413:                m_put_rcvif_psref(ifp, &psref);
1.89      itojun    414:        }
1.376     ozaki-r   415:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.89      itojun    416: }
                    417:
                    418: /*
1.318     rmind     419:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       420:  * try to reassemble.  Process options.  Pass to next level.
                    421:  */
1.312     rmind     422: static void
1.396   ! ozaki-r   423: ip_input(struct mbuf *m, struct ifnet *ifp)
1.1       cgd       424: {
1.109     augustss  425:        struct ip *ip = NULL;
1.339     ozaki-r   426:        struct in_ifaddr *ia = NULL;
1.288     rmind     427:        int hlen = 0, len;
1.100     itojun    428:        int downmatch;
1.169     itojun    429:        int srcrt = 0;
1.339     ozaki-r   430:        int s;
1.1       cgd       431:
1.318     rmind     432:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    433:            "interrupt handler; synchronization assumptions violated");
                    434:
1.164     matt      435:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     436:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   437:
1.1       cgd       438:        /*
                    439:         * If no IP addresses have been set yet but the interfaces
                    440:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     441:         * Note: we pre-check without locks held.
1.1       cgd       442:         */
1.335     ozaki-r   443:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   444:                goto out;
1.266     thorpej   445:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     446:
1.154     thorpej   447:        /*
                    448:         * If the IP header is not aligned, slurp it up into a new
                    449:         * mbuf with space for link headers, in the event we forward
                    450:         * it.  Otherwise, if it is aligned, make sure the entire
                    451:         * base IP header is in the first mbuf of the chain.
                    452:         */
1.244     christos  453:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   454:                if ((m = m_copyup(m, sizeof(struct ip),
1.365     maxv      455:                    (max_linkhdr + 3) & ~3)) == NULL) {
1.154     thorpej   456:                        /* XXXJRT new stat, please */
1.266     thorpej   457:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   458:                        goto out;
1.154     thorpej   459:                }
1.365     maxv      460:        } else if (__predict_false(m->m_len < sizeof(struct ip))) {
                    461:                if ((m = m_pullup(m, sizeof(struct ip))) == NULL) {
1.266     thorpej   462:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   463:                        goto out;
1.154     thorpej   464:                }
1.1       cgd       465:        }
                    466:        ip = mtod(m, struct ip *);
1.13      mycroft   467:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   468:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   469:                goto out;
1.13      mycroft   470:        }
1.1       cgd       471:        hlen = ip->ip_hl << 2;
                    472:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   473:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   474:                goto out;
1.1       cgd       475:        }
                    476:        if (hlen > m->m_len) {
1.298     liamjfoy  477:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   478:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   479:                        goto out;
1.1       cgd       480:                }
                    481:                ip = mtod(m, struct ip *);
                    482:        }
1.98      thorpej   483:
1.85      hwr       484:        /*
1.99      thorpej   485:         * RFC1122: packets with a multicast source address are
1.98      thorpej   486:         * not allowed.
1.85      hwr       487:         */
                    488:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   489:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   490:                goto out;
1.129     itojun    491:        }
                    492:
                    493:        /* 127/8 must not appear on wire - RFC1122 */
                    494:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    495:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     496:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   497:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   498:                        goto out;
1.130     itojun    499:                }
1.85      hwr       500:        }
                    501:
1.135     thorpej   502:        switch (m->m_pkthdr.csum_flags &
1.365     maxv      503:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | M_CSUM_IPv4_BAD)) {
1.135     thorpej   504:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    505:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   506:                IP_STATINC(IP_STAT_BADSUM);
                    507:                goto out;
1.135     thorpej   508:
                    509:        case M_CSUM_IPv4:
                    510:                /* Checksum was okay. */
                    511:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    512:                break;
                    513:
                    514:        default:
1.206     thorpej   515:                /*
                    516:                 * Must compute it ourselves.  Maybe skip checksum on
                    517:                 * loopback interfaces.
                    518:                 */
1.314     rmind     519:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    520:                    ip_do_loopback_cksum)) {
1.206     thorpej   521:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   522:                        if (in_cksum(m, hlen) != 0) {
                    523:                                IP_STATINC(IP_STAT_BADSUM);
                    524:                                goto out;
                    525:                        }
1.206     thorpej   526:                }
1.135     thorpej   527:                break;
1.1       cgd       528:        }
                    529:
1.121     thorpej   530:        /* Retrieve the packet length. */
                    531:        len = ntohs(ip->ip_len);
1.81      proff     532:
                    533:        /*
                    534:         * Check for additional length bogosity
                    535:         */
1.84      proff     536:        if (len < hlen) {
1.266     thorpej   537:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   538:                goto out;
1.81      proff     539:        }
1.1       cgd       540:
                    541:        /*
1.365     maxv      542:         * Check that the amount of data in the buffers is at least as much
                    543:         * as the IP header would have us expect. Trim mbufs if longer than
                    544:         * we expect. Drop packet if shorter than we expect.
1.1       cgd       545:         */
1.35      mycroft   546:        if (m->m_pkthdr.len < len) {
1.266     thorpej   547:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   548:                goto out;
1.1       cgd       549:        }
1.35      mycroft   550:        if (m->m_pkthdr.len > len) {
1.1       cgd       551:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   552:                        m->m_len = len;
                    553:                        m->m_pkthdr.len = len;
1.1       cgd       554:                } else
1.35      mycroft   555:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       556:        }
                    557:
1.64      thorpej   558:        /*
                    559:         * Assume that we can create a fast-forward IP flow entry
                    560:         * based on this packet.
                    561:         */
                    562:        m->m_flags |= M_CANFASTFWD;
                    563:
1.33      mrg       564:        /*
1.64      thorpej   565:         * Run through list of hooks for input packets.  If there are any
                    566:         * filters which require that additional packets in the flow are
                    567:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    568:         * Note that filters must _never_ set this flag, as another filter
                    569:         * in the list may have previously cleared it.
1.378     maxv      570:         *
                    571:         * Don't call hooks if the packet has already been processed by
                    572:         * IPsec (encapsulated, tunnel mode).
1.33      mrg       573:         */
1.304     christos  574: #if defined(IPSEC)
1.388     knakahar  575:        if (!ipsec_used || !ipsec_skip_pfil(m))
1.127     itojun    576: #else
                    577:        if (1)
                    578: #endif
                    579:        {
1.314     rmind     580:                struct in_addr odst = ip->ip_dst;
1.318     rmind     581:                bool freed;
1.169     itojun    582:
1.318     rmind     583:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    584:                if (freed || m == NULL) {
1.343     ozaki-r   585:                        m = NULL;
1.389     ozaki-r   586:                        IP_STATINC(IP_STAT_PFILDROP_IN);
1.329     ozaki-r   587:                        goto out;
1.318     rmind     588:                }
1.390     bouyer    589:                if (__predict_false(m->m_len < sizeof(struct ip))) {
                    590:                        if ((m = m_pullup(m, sizeof(struct ip))) == NULL) {
                    591:                                IP_STATINC(IP_STAT_TOOSMALL);
                    592:                                goto out;
                    593:                        }
                    594:                }
1.127     itojun    595:                ip = mtod(m, struct ip *);
1.142     darrenr   596:                hlen = ip->ip_hl << 2;
1.390     bouyer    597:                if (hlen < sizeof(struct ip)) { /* minimum header length */
                    598:                        IP_STATINC(IP_STAT_BADHLEN);
                    599:                        goto out;
                    600:                }
                    601:                if (hlen > m->m_len) {
                    602:                        if ((m = m_pullup(m, hlen)) == NULL) {
                    603:                                IP_STATINC(IP_STAT_BADHLEN);
                    604:                                goto out;
                    605:                        }
                    606:                        ip = mtod(m, struct ip *);
                    607:                }
1.318     rmind     608:
1.205     darrenr   609:                /*
                    610:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    611:                 * from generating ICMP redirects for packets that have
                    612:                 * been redirected by a hook back out on to the same LAN that
                    613:                 * they came from and is not an indication that the packet
1.373     maxv      614:                 * is being influenced by source routing options.  This
1.205     darrenr   615:                 * allows things like
                    616:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    617:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    618:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    619:                 * also requires a "map tlp0 ..." to complete the story.
                    620:                 * One might argue whether or not this kind of network config.
1.212     perry     621:                 * should be supported in this manner...
1.205     darrenr   622:                 */
1.169     itojun    623:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    624:        }
1.123     thorpej   625:
                    626: #ifdef ALTQ
                    627:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     628:        if (altq_input) {
                    629:                SOFTNET_LOCK();
                    630:                if ((*altq_input)(m, AF_INET) == 0) {
                    631:                        /* Packet dropped by traffic conditioner. */
                    632:                        SOFTNET_UNLOCK();
1.343     ozaki-r   633:                        m = NULL;
1.329     ozaki-r   634:                        goto out;
1.318     rmind     635:                }
                    636:                SOFTNET_UNLOCK();
1.123     thorpej   637:        }
                    638: #endif
1.121     thorpej   639:
                    640:        /*
1.1       cgd       641:         * Process options and, if not destined for us,
                    642:         * ship it on.  ip_dooptions returns 1 when an
                    643:         * error was detected (causing an icmp message
                    644:         * to be sent and the original packet to be freed).
                    645:         */
1.365     maxv      646:        if (hlen > sizeof(struct ip) && ip_dooptions(m)) {
1.343     ozaki-r   647:                m = NULL;
1.329     ozaki-r   648:                goto out;
1.343     ozaki-r   649:        }
1.1       cgd       650:
                    651:        /*
                    652:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    653:         *
                    654:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    655:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       656:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       657:         */
1.100     itojun    658:        downmatch = 0;
1.339     ozaki-r   659:        s = pserialize_read_enter();
1.333     ozaki-r   660:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   661:        if (ia != NULL) {
                    662:                pserialize_read_exit(s);
1.86      thorpej   663:                goto ours;
1.339     ozaki-r   664:        }
1.333     ozaki-r   665:
1.315     christos  666:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   667:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   668:                if (ia != NULL) {
                    669:                        pserialize_read_exit(s);
1.333     ozaki-r   670:                        goto ours;
1.339     ozaki-r   671:                }
1.1       cgd       672:        }
1.339     ozaki-r   673:        pserialize_read_exit(s);
1.333     ozaki-r   674:
1.18      mycroft   675:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   676: #ifdef MROUTING
                    677:                extern struct socket *ip_mrouter;
1.10      brezak    678:
1.4       hpeyerl   679:                if (ip_mrouter) {
                    680:                        /*
                    681:                         * If we are acting as a multicast router, all
                    682:                         * incoming multicast packets are passed to the
                    683:                         * kernel-level multicast forwarding function.
                    684:                         * The packet is returned (relatively) intact; if
                    685:                         * ip_mforward() returns a non-zero value, the packet
                    686:                         * must be discarded, else it may be accepted below.
                    687:                         *
                    688:                         * (The IP ident field is put in the same byte order
                    689:                         * as expected when ip_mforward() is called from
                    690:                         * ip_output().)
                    691:                         */
1.318     rmind     692:                        SOFTNET_LOCK();
1.314     rmind     693:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     694:                                SOFTNET_UNLOCK();
1.266     thorpej   695:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   696:                                goto out;
1.4       hpeyerl   697:                        }
1.318     rmind     698:                        SOFTNET_UNLOCK();
1.4       hpeyerl   699:
                    700:                        /*
                    701:                         * The process-level routing demon needs to receive
                    702:                         * all multicast IGMP packets, whether or not this
                    703:                         * host belongs to their destination groups.
                    704:                         */
1.318     rmind     705:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   706:                                goto ours;
1.318     rmind     707:                        }
1.266     thorpej   708:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   709:                }
                    710: #endif
                    711:                /*
                    712:                 * See if we belong to the destination multicast group on the
                    713:                 * arrival interface.
                    714:                 */
1.316     rmind     715:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   716:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   717:                        goto out;
1.4       hpeyerl   718:                }
                    719:                goto ours;
                    720:        }
1.19      mycroft   721:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   722:            in_nullhost(ip->ip_dst))
1.1       cgd       723:                goto ours;
                    724:
                    725:        /*
                    726:         * Not for us; forward if possible and desirable.
                    727:         */
                    728:        if (ipforwarding == 0) {
1.266     thorpej   729:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       730:                m_freem(m);
1.100     itojun    731:        } else {
                    732:                /*
                    733:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    734:                 * and there's no IFF_UP interface that matches ip_dst,
                    735:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    736:                 * forwarding loop till TTL goes to 0.
                    737:                 */
                    738:                if (downmatch) {
                    739:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   740:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    741:                        return;
                    742:                }
1.304     christos  743: #ifdef IPSEC
1.359     ozaki-r   744:                /* Check the security policy (SP) for the packet */
1.318     rmind     745:                if (ipsec_used) {
1.395     ozaki-r   746:                        if (ipsec_ip_input_checkpolicy(m, true) != 0) {
1.394     ozaki-r   747:                                IP_STATINC(IP_STAT_IPSECDROP_IN);
1.332     ozaki-r   748:                                goto out;
1.318     rmind     749:                        }
1.173     jonathan  750:                }
1.305     rmind     751: #endif
1.329     ozaki-r   752:                ip_forward(m, srcrt, ifp);
1.100     itojun    753:        }
1.89      itojun    754:        return;
1.1       cgd       755:
                    756: ours:
                    757:        /*
                    758:         * If offset or IP_MF are set, must reassemble.
                    759:         */
1.155     itojun    760:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     761:                /*
                    762:                 * Pass to IP reassembly mechanism.
                    763:                 */
1.385     maxv      764:                if (ip_reass_packet(&m) != 0) {
1.289     rmind     765:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   766:                        goto out;
1.16      cgd       767:                }
1.290     rmind     768:                if (m == NULL) {
1.289     rmind     769:                        /* More fragments should come; silently return. */
1.332     ozaki-r   770:                        goto out;
1.289     rmind     771:                }
1.290     rmind     772:                /*
                    773:                 * Reassembly is done, we have the final packet.
1.365     maxv      774:                 * Update cached data in local variable(s).
1.290     rmind     775:                 */
1.289     rmind     776:                ip = mtod(m, struct ip *);
                    777:                hlen = ip->ip_hl << 2;
1.79      mycroft   778:        }
1.128     itojun    779:
1.380     maxv      780:        M_VERIFY_PACKET(m);
                    781:
1.304     christos  782: #ifdef IPSEC
1.173     jonathan  783:        /*
1.305     rmind     784:         * Enforce IPsec policy checking if we are seeing last header.
                    785:         * Note that we do not visit this with protocols with PCB layer
                    786:         * code - like UDP/TCP/raw IP.
1.173     jonathan  787:         */
1.317     christos  788:        if (ipsec_used &&
1.328     riastrad  789:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.395     ozaki-r   790:                if (ipsec_ip_input_checkpolicy(m, false) != 0) {
1.394     ozaki-r   791:                        IP_STATINC(IP_STAT_IPSECDROP_IN);
1.332     ozaki-r   792:                        goto out;
1.173     jonathan  793:                }
                    794:        }
1.305     rmind     795: #endif
1.1       cgd       796:
                    797:        /*
                    798:         * Switch out to protocol's input routine.
                    799:         */
1.82      aidan     800: #if IFA_STATS
1.374     maxv      801:        if (ia) {
1.339     ozaki-r   802:                struct in_ifaddr *_ia;
                    803:                /*
                    804:                 * Keep a reference from ip_match_our_address with psref
                    805:                 * is expensive, so explore ia here again.
                    806:                 */
                    807:                s = pserialize_read_enter();
1.342     ozaki-r   808:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   809:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    810:                pserialize_read_exit(s);
                    811:        }
1.82      aidan     812: #endif
1.266     thorpej   813:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    814:
1.318     rmind     815:        const int off = hlen, nh = ip->ip_p;
                    816:
1.328     riastrad  817:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.89      itojun    818:        return;
1.135     thorpej   819:
1.329     ozaki-r   820: out:
1.332     ozaki-r   821:        if (m != NULL)
                    822:                m_freem(m);
1.1       cgd       823: }
                    824:
                    825: /*
1.288     rmind     826:  * IP timer processing.
1.1       cgd       827:  */
1.8       mycroft   828: void
1.211     perry     829: ip_slowtimo(void)
1.1       cgd       830: {
1.268     ad        831:
1.362     ozaki-r   832:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.1       cgd       833:
1.288     rmind     834:        ip_reass_slowtimo();
1.268     ad        835:
1.362     ozaki-r   836:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.1       cgd       837: }
                    838:
                    839: /*
1.288     rmind     840:  * IP drain processing.
1.1       cgd       841:  */
1.8       mycroft   842: void
1.211     perry     843: ip_drain(void)
1.1       cgd       844: {
                    845:
1.268     ad        846:        KERNEL_LOCK(1, NULL);
1.288     rmind     847:        ip_reass_drain();
1.268     ad        848:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       849: }
                    850:
                    851: /*
1.311     rmind     852:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    853:  * it if bad options are encountered, or forwarding it if source-routed.
                    854:  *
                    855:  * => Returns true if packet has been forwarded/freed.
                    856:  * => Returns false if the packet should be processed further.
1.1       cgd       857:  */
1.311     rmind     858: static bool
1.211     perry     859: ip_dooptions(struct mbuf *m)
1.1       cgd       860: {
1.109     augustss  861:        struct ip *ip = mtod(m, struct ip *);
                    862:        u_char *cp, *cp0;
                    863:        struct ip_timestamp *ipt;
                    864:        struct in_ifaddr *ia;
1.1       cgd       865:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.369     maxv      866:        int srr_present, rr_present, ts_present;
1.104     thorpej   867:        struct in_addr dst;
1.1       cgd       868:        n_time ntime;
1.349     ozaki-r   869:        struct ifaddr *ifa = NULL;
1.339     ozaki-r   870:        int s;
1.1       cgd       871:
1.369     maxv      872:        srr_present = 0;
1.368     maxv      873:        rr_present = 0;
                    874:        ts_present = 0;
                    875:
1.13      mycroft   876:        dst = ip->ip_dst;
1.1       cgd       877:        cp = (u_char *)(ip + 1);
1.365     maxv      878:        cnt = (ip->ip_hl << 2) - sizeof(struct ip);
1.1       cgd       879:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    880:                opt = cp[IPOPT_OPTVAL];
                    881:                if (opt == IPOPT_EOL)
                    882:                        break;
                    883:                if (opt == IPOPT_NOP)
                    884:                        optlen = 1;
                    885:                else {
1.113     itojun    886:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    887:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    888:                                goto bad;
                    889:                        }
1.1       cgd       890:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    891:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       892:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    893:                                goto bad;
                    894:                        }
                    895:                }
                    896:                switch (opt) {
                    897:
                    898:                default:
                    899:                        break;
                    900:
                    901:                /*
                    902:                 * Source routing with record.
                    903:                 * Find interface with current destination address.
                    904:                 * If none on this machine then drop if strictly routed,
                    905:                 * or do nothing if loosely routed.
                    906:                 * Record interface address and bring up next address
                    907:                 * component.  If strictly routed make sure next
                    908:                 * address is on directly accessible net.
                    909:                 */
                    910:                case IPOPT_LSRR:
1.346     ozaki-r   911:                case IPOPT_SSRR: {
                    912:                        struct psref psref;
1.353     ozaki-r   913:                        struct sockaddr_in ipaddr = {
                    914:                            .sin_len = sizeof(ipaddr),
                    915:                            .sin_family = AF_INET,
                    916:                        };
                    917:
1.47      cjs       918:                        if (ip_allowsrcrt == 0) {
                    919:                                type = ICMP_UNREACH;
                    920:                                code = ICMP_UNREACH_NET_PROHIB;
                    921:                                goto bad;
                    922:                        }
1.369     maxv      923:                        if (srr_present++) {
                    924:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                    925:                                goto bad;
1.368     maxv      926:                        }
1.114     itojun    927:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    928:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    929:                                goto bad;
                    930:                        }
1.1       cgd       931:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    932:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    933:                                goto bad;
                    934:                        }
                    935:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   936:
                    937:                        s = pserialize_read_enter();
                    938:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    939:                        if (ifa == NULL) {
                    940:                                pserialize_read_exit(s);
1.1       cgd       941:                                if (opt == IPOPT_SSRR) {
                    942:                                        type = ICMP_UNREACH;
                    943:                                        code = ICMP_UNREACH_SRCFAIL;
                    944:                                        goto bad;
                    945:                                }
                    946:                                /*
                    947:                                 * Loose routing, and not at next destination
                    948:                                 * yet; nothing to do except forward.
                    949:                                 */
                    950:                                break;
                    951:                        }
1.339     ozaki-r   952:                        pserialize_read_exit(s);
                    953:
1.1       cgd       954:                        off--;                  /* 0 origin */
1.112     sommerfe  955:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       956:                                /*
                    957:                                 * End of source route.  Should be for us.
                    958:                                 */
1.354     ozaki-r   959:                                save_rte(m, cp, ip->ip_src);
1.1       cgd       960:                                break;
                    961:                        }
                    962:                        /*
                    963:                         * locate outgoing interface
                    964:                         */
1.281     tsutsui   965:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       966:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   967:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   968:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    969:                                    &psref);
1.339     ozaki-r   970:                                if (ifa != NULL)
                    971:                                        ia = ifatoia(ifa);
                    972:                                else
                    973:                                        ia = NULL;
                    974:                        } else {
1.346     ozaki-r   975:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r   976:                        }
                    977:                        if (ia == NULL) {
1.1       cgd       978:                                type = ICMP_UNREACH;
                    979:                                code = ICMP_UNREACH_SRCFAIL;
                    980:                                goto bad;
                    981:                        }
                    982:                        ip->ip_dst = ipaddr.sin_addr;
1.377     maxv      983:                        memcpy(cp + off, &ia->ia_addr.sin_addr,
                    984:                            sizeof(struct in_addr));
1.346     ozaki-r   985:                        ia4_release(ia, &psref);
1.1       cgd       986:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   987:                        /*
                    988:                         * Let ip_intr's mcast routing check handle mcast pkts
                    989:                         */
1.18      mycroft   990:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       991:                        break;
1.346     ozaki-r   992:                    }
1.1       cgd       993:
1.346     ozaki-r   994:                case IPOPT_RR: {
                    995:                        struct psref psref;
1.353     ozaki-r   996:                        struct sockaddr_in ipaddr = {
                    997:                            .sin_len = sizeof(ipaddr),
                    998:                            .sin_family = AF_INET,
                    999:                        };
                   1000:
1.368     maxv     1001:                        if (rr_present++) {
                   1002:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                   1003:                                goto bad;
                   1004:                        }
1.114     itojun   1005:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1006:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1007:                                goto bad;
                   1008:                        }
1.1       cgd      1009:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1010:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1011:                                goto bad;
                   1012:                        }
                   1013:                        /*
                   1014:                         * If no space remains, ignore.
                   1015:                         */
                   1016:                        off--;                  /* 0 origin */
1.112     sommerfe 1017:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1018:                                break;
1.377     maxv     1019:                        memcpy((void *)&ipaddr.sin_addr, (void *)&ip->ip_dst,
1.1       cgd      1020:                            sizeof(ipaddr.sin_addr));
                   1021:                        /*
                   1022:                         * locate outgoing interface; if we're the destination,
                   1023:                         * use the incoming interface (should be same).
                   1024:                         */
1.346     ozaki-r  1025:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1026:                        if (ifa == NULL) {
1.346     ozaki-r  1027:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1028:                                if (ia == NULL) {
                   1029:                                        type = ICMP_UNREACH;
                   1030:                                        code = ICMP_UNREACH_HOST;
                   1031:                                        goto bad;
                   1032:                                }
                   1033:                        } else {
                   1034:                                ia = ifatoia(ifa);
1.1       cgd      1035:                        }
1.377     maxv     1036:                        memcpy(cp + off, &ia->ia_addr.sin_addr,
                   1037:                            sizeof(struct in_addr));
1.346     ozaki-r  1038:                        ia4_release(ia, &psref);
1.1       cgd      1039:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1040:                        break;
1.346     ozaki-r  1041:                    }
1.1       cgd      1042:
                   1043:                case IPOPT_TS:
                   1044:                        code = cp - (u_char *)ip;
                   1045:                        ipt = (struct ip_timestamp *)cp;
1.368     maxv     1046:                        if (ts_present++) {
                   1047:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                   1048:                                goto bad;
                   1049:                        }
1.114     itojun   1050:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1051:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1052:                                goto bad;
1.114     itojun   1053:                        }
                   1054:                        if (ipt->ipt_ptr < 5) {
                   1055:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1056:                                goto bad;
                   1057:                        }
1.365     maxv     1058:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) {
1.114     itojun   1059:                                if (++ipt->ipt_oflw == 0) {
                   1060:                                        code = (u_char *)&ipt->ipt_ptr -
                   1061:                                            (u_char *)ip;
1.1       cgd      1062:                                        goto bad;
1.114     itojun   1063:                                }
1.1       cgd      1064:                                break;
                   1065:                        }
1.104     thorpej  1066:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1067:                        switch (ipt->ipt_flg) {
                   1068:
                   1069:                        case IPOPT_TS_TSONLY:
                   1070:                                break;
                   1071:
1.329     ozaki-r  1072:                        case IPOPT_TS_TSANDADDR: {
                   1073:                                struct ifnet *rcvif;
1.339     ozaki-r  1074:                                int _s, _ss;
1.353     ozaki-r  1075:                                struct sockaddr_in ipaddr = {
                   1076:                                    .sin_len = sizeof(ipaddr),
                   1077:                                    .sin_family = AF_INET,
                   1078:                                };
1.329     ozaki-r  1079:
1.66      thorpej  1080:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1081:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1082:                                        code = (u_char *)&ipt->ipt_ptr -
                   1083:                                            (u_char *)ip;
1.1       cgd      1084:                                        goto bad;
1.114     itojun   1085:                                }
1.13      mycroft  1086:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1087:                                _ss = pserialize_read_enter();
                   1088:                                rcvif = m_get_rcvif(m, &_s);
1.349     ozaki-r  1089:                                if (__predict_true(rcvif != NULL)) {
                   1090:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1091:                                            rcvif);
                   1092:                                }
1.339     ozaki-r  1093:                                m_put_rcvif(rcvif, &_s);
                   1094:                                if (ifa == NULL) {
                   1095:                                        pserialize_read_exit(_ss);
                   1096:                                        break;
                   1097:                                }
                   1098:                                ia = ifatoia(ifa);
1.377     maxv     1099:                                memcpy(cp0, &ia->ia_addr.sin_addr,
                   1100:                                    sizeof(struct in_addr));
1.339     ozaki-r  1101:                                pserialize_read_exit(_ss);
1.1       cgd      1102:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1103:                                break;
1.329     ozaki-r  1104:                        }
1.1       cgd      1105:
1.353     ozaki-r  1106:                        case IPOPT_TS_PRESPEC: {
                   1107:                                struct sockaddr_in ipaddr = {
                   1108:                                    .sin_len = sizeof(ipaddr),
                   1109:                                    .sin_family = AF_INET,
                   1110:                                };
                   1111:
1.66      thorpej  1112:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1113:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1114:                                        code = (u_char *)&ipt->ipt_ptr -
                   1115:                                            (u_char *)ip;
1.1       cgd      1116:                                        goto bad;
1.114     itojun   1117:                                }
1.281     tsutsui  1118:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1119:                                    sizeof(struct in_addr));
1.339     ozaki-r  1120:                                s = pserialize_read_enter();
                   1121:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1122:                                if (ifa == NULL) {
                   1123:                                        pserialize_read_exit(s);
1.1       cgd      1124:                                        continue;
1.339     ozaki-r  1125:                                }
                   1126:                                pserialize_read_exit(s);
1.1       cgd      1127:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1128:                                break;
1.353     ozaki-r  1129:                            }
1.1       cgd      1130:
                   1131:                        default:
1.114     itojun   1132:                                /* XXX can't take &ipt->ipt_flg */
                   1133:                                code = (u_char *)&ipt->ipt_ptr -
                   1134:                                    (u_char *)ip + 1;
1.1       cgd      1135:                                goto bad;
                   1136:                        }
                   1137:                        ntime = iptime();
1.107     thorpej  1138:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1139:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1140:                            sizeof(n_time));
                   1141:                        ipt->ipt_ptr += sizeof(n_time);
                   1142:                }
                   1143:        }
                   1144:        if (forward) {
1.329     ozaki-r  1145:                struct ifnet *rcvif;
1.339     ozaki-r  1146:                struct psref _psref;
1.329     ozaki-r  1147:
1.26      thorpej  1148:                if (ip_forwsrcrt == 0) {
                   1149:                        type = ICMP_UNREACH;
                   1150:                        code = ICMP_UNREACH_SRCFAIL;
                   1151:                        goto bad;
                   1152:                }
1.329     ozaki-r  1153:
1.339     ozaki-r  1154:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1155:                if (__predict_false(rcvif == NULL)) {
                   1156:                        type = ICMP_UNREACH;
                   1157:                        code = ICMP_UNREACH_HOST;
                   1158:                        goto bad;
                   1159:                }
1.329     ozaki-r  1160:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1161:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1162:                return true;
1.13      mycroft  1163:        }
1.311     rmind    1164:        return false;
1.1       cgd      1165: bad:
1.13      mycroft  1166:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1167:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1168:        return true;
1.1       cgd      1169: }
                   1170:
                   1171: /*
1.311     rmind    1172:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1173:  * return internet address info of interface to be used to get there.
                   1174:  */
1.311     rmind    1175: static struct in_ifaddr *
1.346     ozaki-r  1176: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1177: {
1.249     dyoung   1178:        struct rtentry *rt;
                   1179:        union {
                   1180:                struct sockaddr         dst;
                   1181:                struct sockaddr_in      dst4;
                   1182:        } u;
1.340     ozaki-r  1183:        struct route *ro;
1.249     dyoung   1184:
                   1185:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1186:
1.391     ozaki-r  1187:        ro = rtcache_percpu_getref(ipforward_rt_percpu);
1.340     ozaki-r  1188:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1189:        if (rt == NULL) {
1.391     ozaki-r  1190:                rtcache_percpu_putref(ipforward_rt_percpu);
1.345     ozaki-r  1191:                return NULL;
                   1192:        }
                   1193:
1.346     ozaki-r  1194:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1195:        rtcache_unref(rt, ro);
1.391     ozaki-r  1196:        rtcache_percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1197:
                   1198:        return ifatoia(rt->rt_ifa);
1.1       cgd      1199: }
                   1200:
                   1201: /*
1.311     rmind    1202:  * save_rte: save incoming source route for use in replies, to be picked
                   1203:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1204:  */
1.311     rmind    1205: static void
1.354     ozaki-r  1206: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1207: {
1.354     ozaki-r  1208:        struct ip_srcrt *isr;
                   1209:        struct m_tag *mtag;
1.1       cgd      1210:        unsigned olen;
                   1211:
                   1212:        olen = option[IPOPT_OLEN];
1.354     ozaki-r  1213:        if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
                   1214:                return;
                   1215:
                   1216:        mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
                   1217:        if (mtag == NULL)
1.1       cgd      1218:                return;
1.354     ozaki-r  1219:        isr = (struct ip_srcrt *)(mtag + 1);
                   1220:
                   1221:        memcpy(isr->isr_hdr, option, olen);
                   1222:        isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1223:        isr->isr_dst = dst;
                   1224:        m_tag_prepend(m, mtag);
1.1       cgd      1225: }
                   1226:
                   1227: /*
                   1228:  * Retrieve incoming source route for use in replies,
                   1229:  * in the same form used by setsockopt.
                   1230:  * The first hop is placed before the options, will be removed later.
                   1231:  */
                   1232: struct mbuf *
1.354     ozaki-r  1233: ip_srcroute(struct mbuf *m0)
1.1       cgd      1234: {
1.109     augustss 1235:        struct in_addr *p, *q;
                   1236:        struct mbuf *m;
1.354     ozaki-r  1237:        struct ip_srcrt *isr;
                   1238:        struct m_tag *mtag;
                   1239:
1.387     maxv     1240:        mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE);
1.354     ozaki-r  1241:        if (mtag == NULL)
                   1242:                return NULL;
                   1243:        isr = (struct ip_srcrt *)(mtag + 1);
1.1       cgd      1244:
1.354     ozaki-r  1245:        if (isr->isr_nhops == 0)
1.237     dyoung   1246:                return NULL;
1.354     ozaki-r  1247:
1.1       cgd      1248:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.354     ozaki-r  1249:        if (m == NULL)
1.237     dyoung   1250:                return NULL;
1.1       cgd      1251:
1.164     matt     1252:        MCLAIM(m, &inetdomain.dom_mowner);
1.354     ozaki-r  1253: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1254:
1.354     ozaki-r  1255:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
                   1256:        m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1       cgd      1257:
                   1258:        /*
                   1259:         * First save first hop for return route
                   1260:         */
1.354     ozaki-r  1261:        p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1       cgd      1262:        *(mtod(m, struct in_addr *)) = *p--;
                   1263:
                   1264:        /*
                   1265:         * Copy option fields and padding (nop) to mbuf.
                   1266:         */
1.354     ozaki-r  1267:        isr->isr_nop = IPOPT_NOP;
                   1268:        isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1269:        memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244     christos 1270:            OPTSIZ);
                   1271:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1272:            sizeof(struct in_addr) + OPTSIZ);
                   1273: #undef OPTSIZ
                   1274:        /*
                   1275:         * Record return path as an IP source route,
                   1276:         * reversing the path (pointers are now aligned).
                   1277:         */
1.354     ozaki-r  1278:        while (p >= isr->isr_routes) {
1.1       cgd      1279:                *q++ = *p--;
                   1280:        }
                   1281:        /*
                   1282:         * Last hop goes to final destination.
                   1283:         */
1.354     ozaki-r  1284:        *q = isr->isr_dst;
                   1285:        m_tag_delete(m0, mtag);
                   1286:        return m;
1.1       cgd      1287: }
                   1288:
1.139     matt     1289: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1290:        [PRC_MSGSIZE] = EMSGSIZE,
                   1291:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1292:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1293:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1294:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1295:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1296:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1297:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1298:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1299: };
                   1300:
1.295     dyoung   1301: void
                   1302: ip_fasttimo(void)
                   1303: {
                   1304:        if (ip_drainwanted) {
                   1305:                ip_drain();
                   1306:                ip_drainwanted = 0;
                   1307:        }
                   1308: }
                   1309:
                   1310: void
                   1311: ip_drainstub(void)
                   1312: {
                   1313:        ip_drainwanted = 1;
                   1314: }
                   1315:
1.1       cgd      1316: /*
                   1317:  * Forward a packet.  If some error occurs return the sender
                   1318:  * an icmp packet.  Note we can't always generate a meaningful
                   1319:  * icmp message because icmp doesn't have a large enough repertoire
                   1320:  * of codes and types.
                   1321:  *
                   1322:  * If not forwarding, just drop the packet.  This could be confusing
                   1323:  * if ipforwarding was zero but some routing protocol was advancing
                   1324:  * us as a gateway to somewhere.  However, we must let the routing
                   1325:  * protocol deal with that.
                   1326:  *
                   1327:  * The srcrt parameter indicates whether the packet is being forwarded
                   1328:  * via a source route.
                   1329:  */
1.313     rmind    1330: static void
1.329     ozaki-r  1331: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1332: {
1.109     augustss 1333:        struct ip *ip = mtod(m, struct ip *);
                   1334:        struct rtentry *rt;
1.220     christos 1335:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1336:        struct mbuf *mcopy;
1.13      mycroft  1337:        n_long dest;
1.249     dyoung   1338:        union {
                   1339:                struct sockaddr         dst;
                   1340:                struct sockaddr_in      dst4;
                   1341:        } u;
1.320     ozaki-r  1342:        uint64_t *ips;
1.340     ozaki-r  1343:        struct route *ro;
1.164     matt     1344:
1.318     rmind    1345:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1346:            "interrupt handler; synchronization assumptions violated");
                   1347:
1.164     matt     1348:        /*
                   1349:         * We are now in the output path.
                   1350:         */
                   1351:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1352:
                   1353:        /*
                   1354:         * Clear any in-bound checksum flags for this packet.
                   1355:         */
                   1356:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1357:
1.13      mycroft  1358:        dest = 0;
1.93      sommerfe 1359:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1360:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1361:                m_freem(m);
                   1362:                return;
                   1363:        }
1.318     rmind    1364:
1.1       cgd      1365:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1366:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1367:                return;
                   1368:        }
                   1369:
1.249     dyoung   1370:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1371:
1.392     ozaki-r  1372:        ro = rtcache_percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1373:        rt = rtcache_lookup(ro, &u.dst);
                   1374:        if (rt == NULL) {
1.391     ozaki-r  1375:                rtcache_percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1376:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1377:                return;
1.1       cgd      1378:        }
                   1379:
                   1380:        /*
1.34      mycroft  1381:         * Save at most 68 bytes of the packet in case
1.1       cgd      1382:         * we need to generate an ICMP message to the src.
1.119     itojun   1383:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1384:         */
1.155     itojun   1385:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1386:        if (mcopy)
                   1387:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1388:
1.221     christos 1389:        ip->ip_ttl -= IPTTLDEC;
                   1390:
1.1       cgd      1391:        /*
                   1392:         * If forwarding packet using same interface that it came in on,
                   1393:         * perhaps should send a redirect to sender to shortcut a hop.
                   1394:         * Only send redirect if source is sending directly to us,
                   1395:         * and if packet was not source routed (or has any options).
                   1396:         * Also, don't send redirect if forwarding using a default route
                   1397:         * or a route modified by a redirect.
                   1398:         */
1.329     ozaki-r  1399:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1400:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1401:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1402:            ipsendredirects && !srcrt) {
1.393     ozaki-r  1403:                if ((ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1.19      mycroft  1404:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1405:                        if (rt->rt_flags & RTF_GATEWAY)
                   1406:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1407:                        else
                   1408:                                dest = ip->ip_dst.s_addr;
                   1409:                        /*
                   1410:                         * Router requirements says to only send host
                   1411:                         * redirects.
                   1412:                         */
                   1413:                        type = ICMP_REDIRECT;
                   1414:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1415:                }
                   1416:        }
1.345     ozaki-r  1417:        rtcache_unref(rt, ro);
1.1       cgd      1418:
1.340     ozaki-r  1419:        error = ip_output(m, NULL, ro,
1.173     jonathan 1420:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1421:            NULL, NULL);
1.173     jonathan 1422:
1.320     ozaki-r  1423:        if (error) {
1.266     thorpej  1424:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1425:                goto error;
                   1426:        }
                   1427:
                   1428:        ips = IP_STAT_GETREF();
                   1429:        ips[IP_STAT_FORWARD]++;
                   1430:
                   1431:        if (type) {
                   1432:                ips[IP_STAT_REDIRECTSENT]++;
                   1433:                IP_STAT_PUTREF();
                   1434:                goto redirect;
                   1435:        }
                   1436:
                   1437:        IP_STAT_PUTREF();
                   1438:        if (mcopy) {
1.63      matt     1439: #ifdef GATEWAY
1.320     ozaki-r  1440:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1441:                        ipflow_create(ro, mcopy);
1.63      matt     1442: #endif
1.320     ozaki-r  1443:                m_freem(mcopy);
1.1       cgd      1444:        }
1.320     ozaki-r  1445:
1.391     ozaki-r  1446:        rtcache_percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1447:        return;
                   1448:
                   1449: redirect:
                   1450: error:
1.318     rmind    1451:        if (mcopy == NULL) {
1.391     ozaki-r  1452:                rtcache_percpu_putref(ipforward_rt_percpu);
1.1       cgd      1453:                return;
1.318     rmind    1454:        }
1.13      mycroft  1455:
1.1       cgd      1456:        switch (error) {
                   1457:
                   1458:        case 0:                         /* forwarded, but need redirect */
                   1459:                /* type, code set above */
                   1460:                break;
                   1461:
                   1462:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1463:        case EHOSTUNREACH:
                   1464:        case ENETDOWN:
                   1465:        case EHOSTDOWN:
                   1466:        default:
                   1467:                type = ICMP_UNREACH;
                   1468:                code = ICMP_UNREACH_HOST;
                   1469:                break;
                   1470:
                   1471:        case EMSGSIZE:
                   1472:                type = ICMP_UNREACH;
                   1473:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1474:
1.345     ozaki-r  1475:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1476:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1477:                        rtcache_unref(rt, ro);
                   1478:                }
1.305     rmind    1479: #ifdef IPSEC
1.317     christos 1480:                if (ipsec_used)
1.382     maxv     1481:                        ipsec_mtu(mcopy, &destmtu);
1.305     rmind    1482: #endif
1.266     thorpej  1483:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1484:                break;
                   1485:
                   1486:        case ENOBUFS:
1.143     itojun   1487:                /*
1.311     rmind    1488:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1489:                 * Requirements for IP Version 4 Routers.  Source quench can
1.373     maxv     1490:                 * be a big problem under DoS attacks or if the underlying
1.311     rmind    1491:                 * interface is rate-limited.
1.143     itojun   1492:                 */
                   1493:                if (mcopy)
                   1494:                        m_freem(mcopy);
1.391     ozaki-r  1495:                rtcache_percpu_putref(ipforward_rt_percpu);
1.143     itojun   1496:                return;
1.1       cgd      1497:        }
1.220     christos 1498:        icmp_error(mcopy, type, code, dest, destmtu);
1.392     ozaki-r  1499:        rtcache_percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1500: }
                   1501:
                   1502: void
1.211     perry    1503: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1504:     struct mbuf *m)
1.44      thorpej  1505: {
1.311     rmind    1506:        struct socket *so = inp->inp_socket;
                   1507:        int inpflags = inp->inp_flags;
1.330     ozaki-r  1508:
1.356     christos 1509:        if (SOOPT_TIMESTAMP(so->so_options))
1.381     maxv     1510:                mp = sbsavetimestamp(so->so_options, mp);
1.356     christos 1511:
1.311     rmind    1512:        if (inpflags & INP_RECVDSTADDR) {
1.357     christos 1513:                *mp = sbcreatecontrol(&ip->ip_dst,
1.44      thorpej  1514:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1515:                if (*mp)
                   1516:                        mp = &(*mp)->m_next;
                   1517:        }
1.358     christos 1518:
                   1519:        if (inpflags & INP_RECVTTL) {
                   1520:                *mp = sbcreatecontrol(&ip->ip_ttl,
                   1521:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1522:                if (*mp)
                   1523:                        mp = &(*mp)->m_next;
                   1524:        }
                   1525:
                   1526:        struct psref psref;
                   1527:        ifnet_t *ifp = m_get_rcvif_psref(m, &psref);
                   1528:        if (__predict_false(ifp == NULL)) {
                   1529: #ifdef DIAGNOSTIC
                   1530:                printf("%s: missing receive interface\n", __func__);
                   1531: #endif
                   1532:                return; /* XXX should report error? */
                   1533:        }
                   1534:
1.311     rmind    1535:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1536:                struct in_pktinfo ipi;
1.307     christos 1537:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1538:                ipi.ipi_ifindex = ifp->if_index;
1.357     christos 1539:                *mp = sbcreatecontrol(&ipi,
1.306     christos 1540:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1541:                if (*mp)
                   1542:                        mp = &(*mp)->m_next;
                   1543:        }
1.311     rmind    1544:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1545:                struct sockaddr_dl sdl;
                   1546:
1.337     ozaki-r  1547:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1548:                    NULL, 0);
1.251     dyoung   1549:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1550:                if (*mp)
                   1551:                        mp = &(*mp)->m_next;
                   1552:        }
1.329     ozaki-r  1553:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1554: }
                   1555:
1.189     atatat   1556: /*
1.228     elad     1557:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1558:  */
                   1559: static int
                   1560: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1561: {
                   1562:        int error, tmp;
                   1563:        struct sysctlnode node;
                   1564:
                   1565:        node = *rnode;
                   1566:        tmp = ip_forwsrcrt;
                   1567:        node.sysctl_data = &tmp;
                   1568:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1569:        if (error || newp == NULL)
                   1570:                return (error);
                   1571:
1.280     elad     1572:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1573:            0, NULL, NULL, NULL);
                   1574:        if (error)
                   1575:                return (error);
1.228     elad     1576:
                   1577:        ip_forwsrcrt = tmp;
                   1578:
                   1579:        return (0);
                   1580: }
                   1581:
                   1582: /*
1.189     atatat   1583:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1584:  * range of the new value and tweaks timers if it changes.
                   1585:  */
                   1586: static int
                   1587: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1588: {
1.189     atatat   1589:        int error, tmp;
                   1590:        struct sysctlnode node;
                   1591:
1.350     ozaki-r  1592:        icmp_mtudisc_lock();
                   1593:
1.189     atatat   1594:        node = *rnode;
                   1595:        tmp = ip_mtudisc_timeout;
                   1596:        node.sysctl_data = &tmp;
                   1597:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1598:        if (error || newp == NULL)
1.350     ozaki-r  1599:                goto out;
                   1600:        if (tmp < 0) {
                   1601:                error = EINVAL;
                   1602:                goto out;
                   1603:        }
1.273     matt     1604:
1.189     atatat   1605:        ip_mtudisc_timeout = tmp;
                   1606:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350     ozaki-r  1607:        error = 0;
                   1608: out:
                   1609:        icmp_mtudisc_unlock();
1.351     ozaki-r  1610:        return error;
1.189     atatat   1611: }
1.54      lukem    1612:
1.266     thorpej  1613: static int
                   1614: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1615: {
                   1616:
1.271     thorpej  1617:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1618: }
1.131     itojun   1619:
1.284     pooka    1620: static void
                   1621: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1622: {
1.197     atatat   1623:        sysctl_createv(clog, 0, NULL, NULL,
                   1624:                       CTLFLAG_PERMANENT,
1.203     atatat   1625:                       CTLTYPE_NODE, "inet",
                   1626:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1627:                       NULL, 0, NULL, 0,
                   1628:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1629:        sysctl_createv(clog, 0, NULL, NULL,
                   1630:                       CTLFLAG_PERMANENT,
1.203     atatat   1631:                       CTLTYPE_NODE, "ip",
                   1632:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1633:                       NULL, 0, NULL, 0,
                   1634:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1635:
1.197     atatat   1636:        sysctl_createv(clog, 0, NULL, NULL,
                   1637:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1638:                       CTLTYPE_INT, "forwarding",
                   1639:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1640:                       NULL, 0, &ipforwarding, 0,
                   1641:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1642:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1645:                       CTLTYPE_INT, "redirect",
                   1646:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1647:                       NULL, 0, &ipsendredirects, 0,
                   1648:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1649:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1650:        sysctl_createv(clog, 0, NULL, NULL,
                   1651:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1652:                       CTLTYPE_INT, "ttl",
                   1653:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1654:                       NULL, 0, &ip_defttl, 0,
                   1655:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1656:                       IPCTL_DEFTTL, CTL_EOL);
1.197     atatat   1657:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1658:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1659:                       CTLTYPE_INT, "forwsrcrt",
                   1660:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1661:                                    "datagrams"),
1.228     elad     1662:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1663:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1664:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1665:        sysctl_createv(clog, 0, NULL, NULL,
                   1666:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1667:                       CTLTYPE_INT, "directed-broadcast",
                   1668:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1669:                       NULL, 0, &ip_directedbcast, 0,
                   1670:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1671:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1672:        sysctl_createv(clog, 0, NULL, NULL,
                   1673:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1674:                       CTLTYPE_INT, "allowsrcrt",
                   1675:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1676:                       NULL, 0, &ip_allowsrcrt, 0,
                   1677:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1678:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1679:
1.197     atatat   1680:        sysctl_createv(clog, 0, NULL, NULL,
                   1681:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1682:                       CTLTYPE_INT, "mtudisc",
                   1683:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1684:                       NULL, 0, &ip_mtudisc, 0,
                   1685:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1686:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1687:        sysctl_createv(clog, 0, NULL, NULL,
                   1688:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1689:                       CTLTYPE_INT, "anonportmin",
                   1690:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1691:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1692:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1693:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1694:        sysctl_createv(clog, 0, NULL, NULL,
                   1695:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1696:                       CTLTYPE_INT, "anonportmax",
                   1697:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1698:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1699:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1700:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1701:        sysctl_createv(clog, 0, NULL, NULL,
                   1702:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1703:                       CTLTYPE_INT, "mtudisctimeout",
                   1704:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1705:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1706:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1707:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1708: #ifndef IPNOPRIVPORTS
1.197     atatat   1709:        sysctl_createv(clog, 0, NULL, NULL,
                   1710:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1711:                       CTLTYPE_INT, "lowportmin",
                   1712:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1713:                                    "to assign"),
1.189     atatat   1714:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1715:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1716:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1717:        sysctl_createv(clog, 0, NULL, NULL,
                   1718:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1719:                       CTLTYPE_INT, "lowportmax",
                   1720:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1721:                                    "to assign"),
1.189     atatat   1722:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1723:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1724:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1725: #endif /* IPNOPRIVPORTS */
                   1726: #if NGRE > 0
1.197     atatat   1727:        sysctl_createv(clog, 0, NULL, NULL,
                   1728:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1729:                       CTLTYPE_INT, "grettl",
                   1730:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1731:                       NULL, 0, &ip_gre_ttl, 0,
                   1732:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1733:                       IPCTL_GRE_TTL, CTL_EOL);
                   1734: #endif /* NGRE */
1.197     atatat   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1737:                       CTLTYPE_INT, "checkinterface",
                   1738:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1739:                                    "from RFC1122"),
1.189     atatat   1740:                       NULL, 0, &ip_checkinterface, 0,
                   1741:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1742:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1743:        sysctl_createv(clog, 0, NULL, NULL,
                   1744:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1745:                       CTLTYPE_INT, "random_id",
                   1746:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1747:                       NULL, 0, &ip_do_randomid, 0,
                   1748:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1749:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1752:                       CTLTYPE_INT, "do_loopback_cksum",
                   1753:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1754:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1755:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1756:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT,
                   1759:                       CTLTYPE_STRUCT, "stats",
                   1760:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1761:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1762:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1763:                       CTL_EOL);
1.322     joerg    1764: #if NARP
1.321     roy      1765:        sysctl_createv(clog, 0, NULL, NULL,
                   1766:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1767:                       CTLTYPE_INT, "dad_count",
                   1768:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1769:                                    "probes to send"),
                   1770:                       NULL, 0, &ip_dad_count, 0,
                   1771:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1772:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1773: #endif
1.301     christos 1774:
                   1775:        /* anonportalgo RFC6056 subtree */
1.302     christos 1776:        const struct sysctlnode *portalgo_node;
                   1777:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1778:                       CTLFLAG_PERMANENT,
                   1779:                       CTLTYPE_NODE, "anonportalgo",
                   1780:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1781:                       NULL, 0, NULL, 0,
                   1782:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1783:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1784:                       CTLFLAG_PERMANENT,
                   1785:                       CTLTYPE_STRING, "available",
                   1786:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1787:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1788:                       CTL_CREATE, CTL_EOL);
1.302     christos 1789:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1790:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1791:                       CTLTYPE_STRING, "selected",
                   1792:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1793:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1794:                       CTL_CREATE, CTL_EOL);
                   1795:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1796:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1797:                       CTLTYPE_STRUCT, "reserve",
                   1798:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1799:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1800:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1801: }
1.266     thorpej  1802:
                   1803: void
                   1804: ip_statinc(u_int stat)
                   1805: {
                   1806:
                   1807:        KASSERT(stat < IP_NSTATS);
                   1808:        IP_STATINC(stat);
                   1809: }

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