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Annotation of src/sys/netinet/ip_input.c, Revision 1.355

1.355   ! chs         1: /*     $NetBSD: ip_input.c,v 1.354 2017/03/31 06:49:44 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:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.355   ! chs        94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.354 2017/03/31 06:49:44 ozaki-r Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.278     christos   98: #include "opt_compat_netbsd.h"
1.62      matt       99: #include "opt_gateway.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.344     ozaki-r   104: #include "opt_net_mpsafe.h"
1.324     pooka     105: #endif
1.1       cgd       106:
1.325     roy       107: #include "arp.h"
                    108:
1.5       mycroft   109: #include <sys/param.h>
                    110: #include <sys/systm.h>
1.318     rmind     111: #include <sys/cpu.h>
1.5       mycroft   112: #include <sys/mbuf.h>
                    113: #include <sys/domain.h>
                    114: #include <sys/protosw.h>
                    115: #include <sys/socket.h>
1.44      thorpej   116: #include <sys/socketvar.h>
1.5       mycroft   117: #include <sys/errno.h>
                    118: #include <sys/time.h>
                    119: #include <sys/kernel.h>
1.72      thorpej   120: #include <sys/pool.h>
1.28      christos  121: #include <sys/sysctl.h>
1.230     elad      122: #include <sys/kauth.h>
1.1       cgd       123:
1.5       mycroft   124: #include <net/if.h>
1.44      thorpej   125: #include <net/if_dl.h>
1.5       mycroft   126: #include <net/route.h>
1.318     rmind     127: #include <net/pktqueue.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
1.215     yamt      134: #include <netinet/in_proto.h>
1.5       mycroft   135: #include <netinet/in_var.h>
                    136: #include <netinet/ip_var.h>
1.266     thorpej   137: #include <netinet/ip_private.h>
1.5       mycroft   138: #include <netinet/ip_icmp.h>
1.89      itojun    139: /* just for gif_ttl */
                    140: #include <netinet/in_gif.h>
                    141: #include "gif.h"
1.144     martin    142: #include <net/if_gre.h>
                    143: #include "gre.h"
1.111     jdolecek  144:
                    145: #ifdef MROUTING
                    146: #include <netinet/ip_mroute.h>
                    147: #endif
1.302     christos  148: #include <netinet/portalgo.h>
1.89      itojun    149:
1.304     christos  150: #ifdef IPSEC
1.173     jonathan  151: #include <netipsec/ipsec.h>
1.305     rmind     152: #endif
1.44      thorpej   153:
1.1       cgd       154: #ifndef        IPFORWARDING
                    155: #ifdef GATEWAY
                    156: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    157: #else /* GATEWAY */
                    158: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    159: #endif /* GATEWAY */
                    160: #endif /* IPFORWARDING */
                    161: #ifndef        IPSENDREDIRECTS
                    162: #define        IPSENDREDIRECTS 1
                    163: #endif
1.26      thorpej   164: #ifndef IPFORWSRCRT
1.47      cjs       165: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    166: #endif
                    167: #ifndef IPALLOWSRCRT
1.48      mrg       168: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   169: #endif
1.53      kml       170: #ifndef IPMTUDISC
1.153     itojun    171: #define IPMTUDISC      1
1.53      kml       172: #endif
1.60      kml       173: #ifndef IPMTUDISCTIMEOUT
1.61      kml       174: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       175: #endif
1.53      kml       176:
1.278     christos  177: #ifdef COMPAT_50
                    178: #include <compat/sys/time.h>
                    179: #include <compat/sys/socket.h>
                    180: #endif
                    181:
1.27      thorpej   182: /*
                    183:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    184:  * configuration using this option will Just Work.
                    185:  */
                    186: #ifndef IPDIRECTEDBCAST
                    187: #ifdef DIRECTED_BROADCAST
                    188: #define IPDIRECTEDBCAST        1
                    189: #else
                    190: #define        IPDIRECTEDBCAST 0
                    191: #endif /* DIRECTED_BROADCAST */
                    192: #endif /* IPDIRECTEDBCAST */
1.1       cgd       193: int    ipforwarding = IPFORWARDING;
                    194: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   195: int    ip_defttl = IPDEFTTL;
1.26      thorpej   196: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   197: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       198: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       199: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    200: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       201: #ifdef DIAGNOSTIC
                    202: int    ipprintfs = 0;
                    203: #endif
1.184     jonathan  204:
                    205: int    ip_do_randomid = 0;
                    206:
1.165     christos  207: /*
                    208:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    209:  * the Strong ES model described in RFC 1122, but since the routing table
                    210:  * and transmit implementation do not implement the Strong ES model,
                    211:  * setting this to 1 results in an odd hybrid.
                    212:  *
                    213:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    214:  * to translate the destination address to another local interface.
                    215:  *
                    216:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    217:  * to the loopback interface instead of the interface where the
                    218:  * packets for those addresses are received.
                    219:  */
1.318     rmind     220: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  221:
1.60      kml       222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    223:
1.318     rmind     224: pktqueue_t *           ip_pktq                 __read_mostly;
                    225: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    226: ipid_state_t *         ip_ids                  __read_mostly;
                    227: percpu_t *             ipstat_percpu           __read_mostly;
                    228:
1.340     ozaki-r   229: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       230:
1.183     jonathan  231: uint16_t ip_id;
1.75      thorpej   232:
1.135     thorpej   233: #ifdef INET_CSUM_COUNTERS
                    234: #include <sys/device.h>
                    235:
                    236: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    237:     NULL, "inet", "hwcsum bad");
                    238: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    239:     NULL, "inet", "hwcsum ok");
                    240: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    241:     NULL, "inet", "swcsum");
                    242:
                    243: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    244:
1.201     matt      245: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    246: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    247: EVCNT_ATTACH_STATIC(ip_swcsum);
                    248:
1.135     thorpej   249: #else
                    250:
                    251: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    252:
                    253: #endif /* INET_CSUM_COUNTERS */
                    254:
1.1       cgd       255: /*
1.354     ozaki-r   256:  * Used to save the IP options in case a protocol wants to respond
1.1       cgd       257:  * to an incoming packet over the same route if the packet got here
                    258:  * using IP source routing.  This allows connection establishment and
                    259:  * maintenance when the remote end is on a network that is not known
                    260:  * to us.
                    261:  */
1.354     ozaki-r   262: struct ip_srcrt {
                    263:        int             isr_nhops;                 /* number of hops */
                    264:        struct in_addr  isr_dst;                   /* final destination */
                    265:        char            isr_nop;                   /* one NOP to align */
                    266:        char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
                    267:        struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    268: };
1.1       cgd       269:
1.295     dyoung    270: static int ip_drainwanted;
                    271:
1.354     ozaki-r   272: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35      mycroft   273:
1.164     matt      274: #ifdef MBUFTRACE
1.234     dogcow    275: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    276: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      277: #endif
                    278:
1.318     rmind     279: static void            ipintr(void *);
1.312     rmind     280: static void            ip_input(struct mbuf *);
1.329     ozaki-r   281: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     282: static bool            ip_dooptions(struct mbuf *);
1.346     ozaki-r   283: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     284: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     285:
1.333     ozaki-r   286: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    287:                            int *);
                    288: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    289:                            struct ip *);
                    290:
1.344     ozaki-r   291: #ifdef NET_MPSAFE
                    292: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    293: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    294: #else
1.318     rmind     295: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    296: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.344     ozaki-r   297: #endif
1.318     rmind     298:
1.1       cgd       299: /*
                    300:  * IP initialization: fill in IP protocol switch table.
                    301:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    302:  */
1.8       mycroft   303: void
1.211     perry     304: ip_init(void)
1.1       cgd       305: {
1.199     matt      306:        const struct protosw *pr;
1.1       cgd       307:
1.311     rmind     308:        in_init();
1.284     pooka     309:        sysctl_net_inet_ip_setup(NULL);
                    310:
1.311     rmind     311:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    312:        KASSERT(pr != NULL);
1.275     pooka     313:
1.319     ozaki-r   314:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     315:        KASSERT(ip_pktq != NULL);
                    316:
1.328     riastrad  317:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    318:                ip_protox[i] = pr - inetsw;
1.311     rmind     319:        }
1.328     riastrad  320:        for (pr = inetdomain.dom_protosw;
                    321:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       322:                if (pr->pr_domain->dom_family == PF_INET &&
                    323:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  324:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  325:
1.288     rmind     326:        ip_reass_init();
1.190     jonathan  327:
1.291     rmind     328:        ip_ids = ip_id_init();
1.323     ozaki-r   329:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  330:
1.73      thorpej   331: #ifdef GATEWAY
1.311     rmind     332:        ipflow_init();
1.73      thorpej   333: #endif
1.121     thorpej   334:
                    335:        /* Register our Packet Filter hook. */
1.308     rmind     336:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    337:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   338:
1.164     matt      339: #ifdef MBUFTRACE
                    340:        MOWNER_ATTACH(&ip_tx_mowner);
                    341:        MOWNER_ATTACH(&ip_rx_mowner);
                    342: #endif /* MBUFTRACE */
1.266     thorpej   343:
                    344:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340     ozaki-r   345:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
1.352     ozaki-r   346:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       347: }
                    348:
1.333     ozaki-r   349: static struct in_ifaddr *
                    350: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    351: {
                    352:        struct in_ifaddr *ia = NULL;
                    353:        int checkif;
                    354:
                    355:        /*
                    356:         * Enable a consistency check between the destination address
                    357:         * and the arrival interface for a unicast packet (the RFC 1122
                    358:         * strong ES model) if IP forwarding is disabled and the packet
                    359:         * is not locally generated.
                    360:         *
                    361:         * XXX - Checking also should be disabled if the destination
                    362:         * address is ipnat'ed to a different interface.
                    363:         *
                    364:         * XXX - Checking is incompatible with IP aliases added
                    365:         * to the loopback interface instead of the interface where
                    366:         * the packets are received.
                    367:         *
                    368:         * XXX - We need to add a per ifaddr flag for this so that
                    369:         * we get finer grain control.
                    370:         */
                    371:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    372:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    373:
1.334     ozaki-r   374:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   375:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    376:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    377:                                continue;
                    378:                        if (checkif && ia->ia_ifp != ifp)
                    379:                                continue;
1.341     roy       380:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
                    381:                            (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333     ozaki-r   382:                                break;
                    383:                        else
1.338     ozaki-r   384:                                (*downmatch)++;
1.333     ozaki-r   385:                }
                    386:        }
                    387:
                    388:        return ia;
                    389: }
                    390:
                    391: static struct in_ifaddr *
                    392: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    393: {
                    394:        struct in_ifaddr *ia = NULL;
                    395:        struct ifaddr *ifa;
                    396:
1.336     ozaki-r   397:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   398:                if (ifa->ifa_addr->sa_family != AF_INET)
                    399:                        continue;
                    400:                ia = ifatoia(ifa);
1.341     roy       401:                if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333     ozaki-r   402:                        continue;
                    403:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    404:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    405:                    /*
                    406:                     * Look for all-0's host part (old broadcast addr),
                    407:                     * either for subnet or net.
                    408:                     */
                    409:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    410:                    ip->ip_dst.s_addr == ia->ia_net)
                    411:                        goto matched;
                    412:                /*
                    413:                 * An interface with IP address zero accepts
                    414:                 * all packets that arrive on that interface.
                    415:                 */
                    416:                if (in_nullhost(ia->ia_addr.sin_addr))
                    417:                        goto matched;
                    418:        }
                    419:        ia = NULL;
                    420:
                    421: matched:
                    422:        return ia;
                    423: }
                    424:
1.1       cgd       425: /*
1.318     rmind     426:  * IP software interrupt routine.
1.89      itojun    427:  */
1.318     rmind     428: static void
                    429: ipintr(void *arg __unused)
1.89      itojun    430: {
                    431:        struct mbuf *m;
1.286     tls       432:
1.318     rmind     433:        KASSERT(cpu_softintr_p());
1.89      itojun    434:
1.344     ozaki-r   435: #ifndef NET_MPSAFE
1.268     ad        436:        mutex_enter(softnet_lock);
1.344     ozaki-r   437: #endif
1.318     rmind     438:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    439:                ip_input(m);
                    440:        }
1.344     ozaki-r   441: #ifndef NET_MPSAFE
1.268     ad        442:        mutex_exit(softnet_lock);
1.344     ozaki-r   443: #endif
1.89      itojun    444: }
                    445:
                    446: /*
1.318     rmind     447:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       448:  * try to reassemble.  Process options.  Pass to next level.
                    449:  */
1.312     rmind     450: static void
1.89      itojun    451: ip_input(struct mbuf *m)
1.1       cgd       452: {
1.109     augustss  453:        struct ip *ip = NULL;
1.339     ozaki-r   454:        struct in_ifaddr *ia = NULL;
1.288     rmind     455:        int hlen = 0, len;
1.100     itojun    456:        int downmatch;
1.169     itojun    457:        int srcrt = 0;
1.314     rmind     458:        ifnet_t *ifp;
1.329     ozaki-r   459:        struct psref psref;
1.339     ozaki-r   460:        int s;
1.1       cgd       461:
1.318     rmind     462:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    463:            "interrupt handler; synchronization assumptions violated");
                    464:
1.164     matt      465:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     466:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   467:
                    468:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   469:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   470:                goto out;
1.164     matt      471:
1.1       cgd       472:        /*
                    473:         * If no IP addresses have been set yet but the interfaces
                    474:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     475:         * Note: we pre-check without locks held.
1.1       cgd       476:         */
1.335     ozaki-r   477:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   478:                goto out;
1.266     thorpej   479:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     480:
1.154     thorpej   481:        /*
                    482:         * If the IP header is not aligned, slurp it up into a new
                    483:         * mbuf with space for link headers, in the event we forward
                    484:         * it.  Otherwise, if it is aligned, make sure the entire
                    485:         * base IP header is in the first mbuf of the chain.
                    486:         */
1.244     christos  487:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   488:                if ((m = m_copyup(m, sizeof(struct ip),
                    489:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    490:                        /* XXXJRT new stat, please */
1.266     thorpej   491:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   492:                        goto out;
1.154     thorpej   493:                }
                    494:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    495:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   496:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   497:                        goto out;
1.154     thorpej   498:                }
1.1       cgd       499:        }
                    500:        ip = mtod(m, struct ip *);
1.13      mycroft   501:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   502:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   503:                goto out;
1.13      mycroft   504:        }
1.1       cgd       505:        hlen = ip->ip_hl << 2;
                    506:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   507:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   508:                goto out;
1.1       cgd       509:        }
                    510:        if (hlen > m->m_len) {
1.298     liamjfoy  511:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   512:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   513:                        goto out;
1.1       cgd       514:                }
                    515:                ip = mtod(m, struct ip *);
                    516:        }
1.98      thorpej   517:
1.85      hwr       518:        /*
1.99      thorpej   519:         * RFC1122: packets with a multicast source address are
1.98      thorpej   520:         * not allowed.
1.85      hwr       521:         */
                    522:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   523:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   524:                goto out;
1.129     itojun    525:        }
                    526:
                    527:        /* 127/8 must not appear on wire - RFC1122 */
                    528:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    529:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     530:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   531:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   532:                        goto out;
1.130     itojun    533:                }
1.85      hwr       534:        }
                    535:
1.135     thorpej   536:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     537:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   538:                 M_CSUM_IPv4_BAD)) {
                    539:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    540:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   541:                IP_STATINC(IP_STAT_BADSUM);
                    542:                goto out;
1.135     thorpej   543:
                    544:        case M_CSUM_IPv4:
                    545:                /* Checksum was okay. */
                    546:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    547:                break;
                    548:
                    549:        default:
1.206     thorpej   550:                /*
                    551:                 * Must compute it ourselves.  Maybe skip checksum on
                    552:                 * loopback interfaces.
                    553:                 */
1.314     rmind     554:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    555:                    ip_do_loopback_cksum)) {
1.206     thorpej   556:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   557:                        if (in_cksum(m, hlen) != 0) {
                    558:                                IP_STATINC(IP_STAT_BADSUM);
                    559:                                goto out;
                    560:                        }
1.206     thorpej   561:                }
1.135     thorpej   562:                break;
1.1       cgd       563:        }
                    564:
1.121     thorpej   565:        /* Retrieve the packet length. */
                    566:        len = ntohs(ip->ip_len);
1.81      proff     567:
                    568:        /*
                    569:         * Check for additional length bogosity
                    570:         */
1.84      proff     571:        if (len < hlen) {
1.266     thorpej   572:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   573:                goto out;
1.81      proff     574:        }
1.1       cgd       575:
                    576:        /*
                    577:         * Check that the amount of data in the buffers
                    578:         * is as at least much as the IP header would have us expect.
                    579:         * Trim mbufs if longer than we expect.
                    580:         * Drop packet if shorter than we expect.
                    581:         */
1.35      mycroft   582:        if (m->m_pkthdr.len < len) {
1.266     thorpej   583:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   584:                goto out;
1.1       cgd       585:        }
1.35      mycroft   586:        if (m->m_pkthdr.len > len) {
1.1       cgd       587:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   588:                        m->m_len = len;
                    589:                        m->m_pkthdr.len = len;
1.1       cgd       590:                } else
1.35      mycroft   591:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       592:        }
                    593:
1.64      thorpej   594:        /*
                    595:         * Assume that we can create a fast-forward IP flow entry
                    596:         * based on this packet.
                    597:         */
                    598:        m->m_flags |= M_CANFASTFWD;
                    599:
1.33      mrg       600:        /*
1.64      thorpej   601:         * Run through list of hooks for input packets.  If there are any
                    602:         * filters which require that additional packets in the flow are
                    603:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    604:         * Note that filters must _never_ set this flag, as another filter
                    605:         * in the list may have previously cleared it.
1.33      mrg       606:         */
1.304     christos  607: #if defined(IPSEC)
1.317     christos  608:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    609: #else
                    610:        if (1)
                    611: #endif
                    612:        {
1.314     rmind     613:                struct in_addr odst = ip->ip_dst;
1.318     rmind     614:                bool freed;
1.169     itojun    615:
1.318     rmind     616:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    617:                if (freed || m == NULL) {
1.343     ozaki-r   618:                        m = NULL;
1.329     ozaki-r   619:                        goto out;
1.318     rmind     620:                }
1.127     itojun    621:                ip = mtod(m, struct ip *);
1.142     darrenr   622:                hlen = ip->ip_hl << 2;
1.318     rmind     623:
1.205     darrenr   624:                /*
                    625:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    626:                 * from generating ICMP redirects for packets that have
                    627:                 * been redirected by a hook back out on to the same LAN that
                    628:                 * they came from and is not an indication that the packet
                    629:                 * is being inffluenced by source routing options.  This
                    630:                 * allows things like
                    631:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    632:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    633:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    634:                 * also requires a "map tlp0 ..." to complete the story.
                    635:                 * One might argue whether or not this kind of network config.
1.212     perry     636:                 * should be supported in this manner...
1.205     darrenr   637:                 */
1.169     itojun    638:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    639:        }
1.123     thorpej   640:
                    641: #ifdef ALTQ
                    642:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     643:        if (altq_input) {
                    644:                SOFTNET_LOCK();
                    645:                if ((*altq_input)(m, AF_INET) == 0) {
                    646:                        /* Packet dropped by traffic conditioner. */
                    647:                        SOFTNET_UNLOCK();
1.343     ozaki-r   648:                        m = NULL;
1.329     ozaki-r   649:                        goto out;
1.318     rmind     650:                }
                    651:                SOFTNET_UNLOCK();
1.123     thorpej   652:        }
                    653: #endif
1.121     thorpej   654:
                    655:        /*
1.1       cgd       656:         * Process options and, if not destined for us,
                    657:         * ship it on.  ip_dooptions returns 1 when an
                    658:         * error was detected (causing an icmp message
                    659:         * to be sent and the original packet to be freed).
                    660:         */
1.343     ozaki-r   661:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    662:                m = NULL;
1.329     ozaki-r   663:                goto out;
1.343     ozaki-r   664:        }
1.1       cgd       665:
                    666:        /*
                    667:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    668:         *
                    669:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    670:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       671:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       672:         */
1.100     itojun    673:        downmatch = 0;
1.339     ozaki-r   674:        s = pserialize_read_enter();
1.333     ozaki-r   675:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   676:        if (ia != NULL) {
                    677:                pserialize_read_exit(s);
1.86      thorpej   678:                goto ours;
1.339     ozaki-r   679:        }
1.333     ozaki-r   680:
1.315     christos  681:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   682:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   683:                if (ia != NULL) {
                    684:                        pserialize_read_exit(s);
1.333     ozaki-r   685:                        goto ours;
1.339     ozaki-r   686:                }
1.1       cgd       687:        }
1.339     ozaki-r   688:        pserialize_read_exit(s);
1.333     ozaki-r   689:
1.18      mycroft   690:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   691: #ifdef MROUTING
                    692:                extern struct socket *ip_mrouter;
1.10      brezak    693:
1.4       hpeyerl   694:                if (ip_mrouter) {
                    695:                        /*
                    696:                         * If we are acting as a multicast router, all
                    697:                         * incoming multicast packets are passed to the
                    698:                         * kernel-level multicast forwarding function.
                    699:                         * The packet is returned (relatively) intact; if
                    700:                         * ip_mforward() returns a non-zero value, the packet
                    701:                         * must be discarded, else it may be accepted below.
                    702:                         *
                    703:                         * (The IP ident field is put in the same byte order
                    704:                         * as expected when ip_mforward() is called from
                    705:                         * ip_output().)
                    706:                         */
1.318     rmind     707:                        SOFTNET_LOCK();
1.314     rmind     708:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     709:                                SOFTNET_UNLOCK();
1.266     thorpej   710:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   711:                                goto out;
1.4       hpeyerl   712:                        }
1.318     rmind     713:                        SOFTNET_UNLOCK();
1.4       hpeyerl   714:
                    715:                        /*
                    716:                         * The process-level routing demon needs to receive
                    717:                         * all multicast IGMP packets, whether or not this
                    718:                         * host belongs to their destination groups.
                    719:                         */
1.318     rmind     720:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   721:                                goto ours;
1.318     rmind     722:                        }
1.266     thorpej   723:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   724:                }
                    725: #endif
                    726:                /*
                    727:                 * See if we belong to the destination multicast group on the
                    728:                 * arrival interface.
                    729:                 */
1.316     rmind     730:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   731:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   732:                        goto out;
1.4       hpeyerl   733:                }
                    734:                goto ours;
                    735:        }
1.19      mycroft   736:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   737:            in_nullhost(ip->ip_dst))
1.1       cgd       738:                goto ours;
                    739:
                    740:        /*
                    741:         * Not for us; forward if possible and desirable.
                    742:         */
                    743:        if (ipforwarding == 0) {
1.329     ozaki-r   744:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   745:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       746:                m_freem(m);
1.100     itojun    747:        } else {
                    748:                /*
                    749:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    750:                 * and there's no IFF_UP interface that matches ip_dst,
                    751:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    752:                 * forwarding loop till TTL goes to 0.
                    753:                 */
                    754:                if (downmatch) {
1.329     ozaki-r   755:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    756:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   757:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    758:                        return;
                    759:                }
1.304     christos  760: #ifdef IPSEC
1.305     rmind     761:                /* Perform IPsec, if any. */
1.318     rmind     762:                if (ipsec_used) {
                    763:                        SOFTNET_LOCK();
                    764:                        if (ipsec4_input(m, IP_FORWARDING |
                    765:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    766:                                SOFTNET_UNLOCK();
1.332     ozaki-r   767:                                goto out;
1.318     rmind     768:                        }
                    769:                        SOFTNET_UNLOCK();
1.173     jonathan  770:                }
1.305     rmind     771: #endif
1.329     ozaki-r   772:                ip_forward(m, srcrt, ifp);
                    773:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    774:        }
1.89      itojun    775:        return;
1.1       cgd       776:
                    777: ours:
1.329     ozaki-r   778:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   779:        ifp = NULL;
1.329     ozaki-r   780:
1.1       cgd       781:        /*
                    782:         * If offset or IP_MF are set, must reassemble.
                    783:         */
1.155     itojun    784:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     785:                /*
                    786:                 * Pass to IP reassembly mechanism.
                    787:                 */
1.290     rmind     788:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     789:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   790:                        goto out;
1.16      cgd       791:                }
1.290     rmind     792:                if (m == NULL) {
1.289     rmind     793:                        /* More fragments should come; silently return. */
1.332     ozaki-r   794:                        goto out;
1.289     rmind     795:                }
1.290     rmind     796:                /*
                    797:                 * Reassembly is done, we have the final packet.
                    798:                 * Updated cached data in local variable(s).
                    799:                 */
1.289     rmind     800:                ip = mtod(m, struct ip *);
                    801:                hlen = ip->ip_hl << 2;
1.79      mycroft   802:        }
1.128     itojun    803:
1.304     christos  804: #ifdef IPSEC
1.173     jonathan  805:        /*
1.305     rmind     806:         * Enforce IPsec policy checking if we are seeing last header.
                    807:         * Note that we do not visit this with protocols with PCB layer
                    808:         * code - like UDP/TCP/raw IP.
1.173     jonathan  809:         */
1.317     christos  810:        if (ipsec_used &&
1.328     riastrad  811:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     812:                SOFTNET_LOCK();
1.305     rmind     813:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     814:                        SOFTNET_UNLOCK();
1.332     ozaki-r   815:                        goto out;
1.173     jonathan  816:                }
1.318     rmind     817:                SOFTNET_UNLOCK();
1.173     jonathan  818:        }
1.305     rmind     819: #endif
1.1       cgd       820:
                    821:        /*
                    822:         * Switch out to protocol's input routine.
                    823:         */
1.82      aidan     824: #if IFA_STATS
1.339     ozaki-r   825:        if (ia && ip) {
                    826:                struct in_ifaddr *_ia;
                    827:                /*
                    828:                 * Keep a reference from ip_match_our_address with psref
                    829:                 * is expensive, so explore ia here again.
                    830:                 */
                    831:                s = pserialize_read_enter();
1.342     ozaki-r   832:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   833:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    834:                pserialize_read_exit(s);
                    835:        }
1.82      aidan     836: #endif
1.266     thorpej   837:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    838:
1.318     rmind     839:        const int off = hlen, nh = ip->ip_p;
                    840:
                    841:        SOFTNET_LOCK();
1.328     riastrad  842:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     843:        SOFTNET_UNLOCK();
1.89      itojun    844:        return;
1.135     thorpej   845:
1.329     ozaki-r   846: out:
                    847:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   848:        if (m != NULL)
                    849:                m_freem(m);
1.1       cgd       850: }
                    851:
                    852: /*
1.288     rmind     853:  * IP timer processing.
1.1       cgd       854:  */
1.8       mycroft   855: void
1.211     perry     856: ip_slowtimo(void)
1.1       cgd       857: {
1.268     ad        858:
1.348     ozaki-r   859: #ifndef NET_MPSAFE
1.268     ad        860:        mutex_enter(softnet_lock);
                    861:        KERNEL_LOCK(1, NULL);
1.348     ozaki-r   862: #endif
1.1       cgd       863:
1.288     rmind     864:        ip_reass_slowtimo();
1.268     ad        865:
1.348     ozaki-r   866: #ifndef NET_MPSAFE
1.268     ad        867:        KERNEL_UNLOCK_ONE(NULL);
                    868:        mutex_exit(softnet_lock);
1.348     ozaki-r   869: #endif
1.1       cgd       870: }
                    871:
                    872: /*
1.288     rmind     873:  * IP drain processing.
1.1       cgd       874:  */
1.8       mycroft   875: void
1.211     perry     876: ip_drain(void)
1.1       cgd       877: {
                    878:
1.268     ad        879:        KERNEL_LOCK(1, NULL);
1.288     rmind     880:        ip_reass_drain();
1.268     ad        881:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       882: }
                    883:
                    884: /*
1.311     rmind     885:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    886:  * it if bad options are encountered, or forwarding it if source-routed.
                    887:  *
                    888:  * => Returns true if packet has been forwarded/freed.
                    889:  * => Returns false if the packet should be processed further.
1.1       cgd       890:  */
1.311     rmind     891: static bool
1.211     perry     892: ip_dooptions(struct mbuf *m)
1.1       cgd       893: {
1.109     augustss  894:        struct ip *ip = mtod(m, struct ip *);
                    895:        u_char *cp, *cp0;
                    896:        struct ip_timestamp *ipt;
                    897:        struct in_ifaddr *ia;
1.1       cgd       898:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   899:        struct in_addr dst;
1.1       cgd       900:        n_time ntime;
1.349     ozaki-r   901:        struct ifaddr *ifa = NULL;
1.339     ozaki-r   902:        int s;
1.1       cgd       903:
1.13      mycroft   904:        dst = ip->ip_dst;
1.1       cgd       905:        cp = (u_char *)(ip + 1);
                    906:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    907:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    908:                opt = cp[IPOPT_OPTVAL];
                    909:                if (opt == IPOPT_EOL)
                    910:                        break;
                    911:                if (opt == IPOPT_NOP)
                    912:                        optlen = 1;
                    913:                else {
1.113     itojun    914:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    915:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    916:                                goto bad;
                    917:                        }
1.1       cgd       918:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    919:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       920:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    921:                                goto bad;
                    922:                        }
                    923:                }
                    924:                switch (opt) {
                    925:
                    926:                default:
                    927:                        break;
                    928:
                    929:                /*
                    930:                 * Source routing with record.
                    931:                 * Find interface with current destination address.
                    932:                 * If none on this machine then drop if strictly routed,
                    933:                 * or do nothing if loosely routed.
                    934:                 * Record interface address and bring up next address
                    935:                 * component.  If strictly routed make sure next
                    936:                 * address is on directly accessible net.
                    937:                 */
                    938:                case IPOPT_LSRR:
1.346     ozaki-r   939:                case IPOPT_SSRR: {
                    940:                        struct psref psref;
1.353     ozaki-r   941:                        struct sockaddr_in ipaddr = {
                    942:                            .sin_len = sizeof(ipaddr),
                    943:                            .sin_family = AF_INET,
                    944:                        };
                    945:
1.47      cjs       946:                        if (ip_allowsrcrt == 0) {
                    947:                                type = ICMP_UNREACH;
                    948:                                code = ICMP_UNREACH_NET_PROHIB;
                    949:                                goto bad;
                    950:                        }
1.114     itojun    951:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    952:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    953:                                goto bad;
                    954:                        }
1.1       cgd       955:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    956:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    957:                                goto bad;
                    958:                        }
                    959:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   960:
                    961:                        s = pserialize_read_enter();
                    962:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    963:                        if (ifa == NULL) {
                    964:                                pserialize_read_exit(s);
1.1       cgd       965:                                if (opt == IPOPT_SSRR) {
                    966:                                        type = ICMP_UNREACH;
                    967:                                        code = ICMP_UNREACH_SRCFAIL;
                    968:                                        goto bad;
                    969:                                }
                    970:                                /*
                    971:                                 * Loose routing, and not at next destination
                    972:                                 * yet; nothing to do except forward.
                    973:                                 */
                    974:                                break;
                    975:                        }
1.339     ozaki-r   976:                        pserialize_read_exit(s);
                    977:
1.1       cgd       978:                        off--;                  /* 0 origin */
1.112     sommerfe  979:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       980:                                /*
                    981:                                 * End of source route.  Should be for us.
                    982:                                 */
1.354     ozaki-r   983:                                save_rte(m, cp, ip->ip_src);
1.1       cgd       984:                                break;
                    985:                        }
                    986:                        /*
                    987:                         * locate outgoing interface
                    988:                         */
1.281     tsutsui   989:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       990:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   991:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   992:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    993:                                    &psref);
1.339     ozaki-r   994:                                if (ifa != NULL)
                    995:                                        ia = ifatoia(ifa);
                    996:                                else
                    997:                                        ia = NULL;
                    998:                        } else {
1.346     ozaki-r   999:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1000:                        }
                   1001:                        if (ia == NULL) {
1.1       cgd      1002:                                type = ICMP_UNREACH;
                   1003:                                code = ICMP_UNREACH_SRCFAIL;
                   1004:                                goto bad;
                   1005:                        }
                   1006:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1007:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1008:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1009:                        ia4_release(ia, &psref);
1.1       cgd      1010:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1011:                        /*
                   1012:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1013:                         */
1.18      mycroft  1014:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1015:                        break;
1.346     ozaki-r  1016:                    }
1.1       cgd      1017:
1.346     ozaki-r  1018:                case IPOPT_RR: {
                   1019:                        struct psref psref;
1.353     ozaki-r  1020:                        struct sockaddr_in ipaddr = {
                   1021:                            .sin_len = sizeof(ipaddr),
                   1022:                            .sin_family = AF_INET,
                   1023:                        };
                   1024:
1.114     itojun   1025:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1026:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1027:                                goto bad;
                   1028:                        }
1.1       cgd      1029:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1030:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1031:                                goto bad;
                   1032:                        }
                   1033:                        /*
                   1034:                         * If no space remains, ignore.
                   1035:                         */
                   1036:                        off--;                  /* 0 origin */
1.112     sommerfe 1037:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1038:                                break;
1.281     tsutsui  1039:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1040:                            sizeof(ipaddr.sin_addr));
                   1041:                        /*
                   1042:                         * locate outgoing interface; if we're the destination,
                   1043:                         * use the incoming interface (should be same).
                   1044:                         */
1.346     ozaki-r  1045:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1046:                        if (ifa == NULL) {
1.346     ozaki-r  1047:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1048:                                if (ia == NULL) {
                   1049:                                        type = ICMP_UNREACH;
                   1050:                                        code = ICMP_UNREACH_HOST;
                   1051:                                        goto bad;
                   1052:                                }
                   1053:                        } else {
                   1054:                                ia = ifatoia(ifa);
1.1       cgd      1055:                        }
1.244     christos 1056:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1057:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1058:                        ia4_release(ia, &psref);
1.1       cgd      1059:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1060:                        break;
1.346     ozaki-r  1061:                    }
1.1       cgd      1062:
                   1063:                case IPOPT_TS:
                   1064:                        code = cp - (u_char *)ip;
                   1065:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1066:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1067:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1068:                                goto bad;
1.114     itojun   1069:                        }
                   1070:                        if (ipt->ipt_ptr < 5) {
                   1071:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1072:                                goto bad;
                   1073:                        }
1.15      cgd      1074:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1075:                                if (++ipt->ipt_oflw == 0) {
                   1076:                                        code = (u_char *)&ipt->ipt_ptr -
                   1077:                                            (u_char *)ip;
1.1       cgd      1078:                                        goto bad;
1.114     itojun   1079:                                }
1.1       cgd      1080:                                break;
                   1081:                        }
1.104     thorpej  1082:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1083:                        switch (ipt->ipt_flg) {
                   1084:
                   1085:                        case IPOPT_TS_TSONLY:
                   1086:                                break;
                   1087:
1.329     ozaki-r  1088:                        case IPOPT_TS_TSANDADDR: {
                   1089:                                struct ifnet *rcvif;
1.339     ozaki-r  1090:                                int _s, _ss;
1.353     ozaki-r  1091:                                struct sockaddr_in ipaddr = {
                   1092:                                    .sin_len = sizeof(ipaddr),
                   1093:                                    .sin_family = AF_INET,
                   1094:                                };
1.329     ozaki-r  1095:
1.66      thorpej  1096:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1097:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1098:                                        code = (u_char *)&ipt->ipt_ptr -
                   1099:                                            (u_char *)ip;
1.1       cgd      1100:                                        goto bad;
1.114     itojun   1101:                                }
1.13      mycroft  1102:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1103:                                _ss = pserialize_read_enter();
                   1104:                                rcvif = m_get_rcvif(m, &_s);
1.349     ozaki-r  1105:                                if (__predict_true(rcvif != NULL)) {
                   1106:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1107:                                            rcvif);
                   1108:                                }
1.339     ozaki-r  1109:                                m_put_rcvif(rcvif, &_s);
                   1110:                                if (ifa == NULL) {
                   1111:                                        pserialize_read_exit(_ss);
                   1112:                                        break;
                   1113:                                }
                   1114:                                ia = ifatoia(ifa);
1.104     thorpej  1115:                                bcopy(&ia->ia_addr.sin_addr,
                   1116:                                    cp0, sizeof(struct in_addr));
1.339     ozaki-r  1117:                                pserialize_read_exit(_ss);
1.1       cgd      1118:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1119:                                break;
1.329     ozaki-r  1120:                        }
1.1       cgd      1121:
1.353     ozaki-r  1122:                        case IPOPT_TS_PRESPEC: {
                   1123:                                struct sockaddr_in ipaddr = {
                   1124:                                    .sin_len = sizeof(ipaddr),
                   1125:                                    .sin_family = AF_INET,
                   1126:                                };
                   1127:
1.66      thorpej  1128:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1129:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1130:                                        code = (u_char *)&ipt->ipt_ptr -
                   1131:                                            (u_char *)ip;
1.1       cgd      1132:                                        goto bad;
1.114     itojun   1133:                                }
1.281     tsutsui  1134:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1135:                                    sizeof(struct in_addr));
1.339     ozaki-r  1136:                                s = pserialize_read_enter();
                   1137:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1138:                                if (ifa == NULL) {
                   1139:                                        pserialize_read_exit(s);
1.1       cgd      1140:                                        continue;
1.339     ozaki-r  1141:                                }
                   1142:                                pserialize_read_exit(s);
1.1       cgd      1143:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1144:                                break;
1.353     ozaki-r  1145:                            }
1.1       cgd      1146:
                   1147:                        default:
1.114     itojun   1148:                                /* XXX can't take &ipt->ipt_flg */
                   1149:                                code = (u_char *)&ipt->ipt_ptr -
                   1150:                                    (u_char *)ip + 1;
1.1       cgd      1151:                                goto bad;
                   1152:                        }
                   1153:                        ntime = iptime();
1.107     thorpej  1154:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1155:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1156:                            sizeof(n_time));
                   1157:                        ipt->ipt_ptr += sizeof(n_time);
                   1158:                }
                   1159:        }
                   1160:        if (forward) {
1.329     ozaki-r  1161:                struct ifnet *rcvif;
1.339     ozaki-r  1162:                struct psref _psref;
1.329     ozaki-r  1163:
1.26      thorpej  1164:                if (ip_forwsrcrt == 0) {
                   1165:                        type = ICMP_UNREACH;
                   1166:                        code = ICMP_UNREACH_SRCFAIL;
                   1167:                        goto bad;
                   1168:                }
1.329     ozaki-r  1169:
1.339     ozaki-r  1170:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1171:                if (__predict_false(rcvif == NULL)) {
                   1172:                        type = ICMP_UNREACH;
                   1173:                        code = ICMP_UNREACH_HOST;
                   1174:                        goto bad;
                   1175:                }
1.329     ozaki-r  1176:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1177:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1178:                return true;
1.13      mycroft  1179:        }
1.311     rmind    1180:        return false;
1.1       cgd      1181: bad:
1.13      mycroft  1182:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1183:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1184:        return true;
1.1       cgd      1185: }
                   1186:
                   1187: /*
1.311     rmind    1188:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1189:  * return internet address info of interface to be used to get there.
                   1190:  */
1.311     rmind    1191: static struct in_ifaddr *
1.346     ozaki-r  1192: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1193: {
1.249     dyoung   1194:        struct rtentry *rt;
                   1195:        union {
                   1196:                struct sockaddr         dst;
                   1197:                struct sockaddr_in      dst4;
                   1198:        } u;
1.340     ozaki-r  1199:        struct route *ro;
1.249     dyoung   1200:
                   1201:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1202:
1.340     ozaki-r  1203:        ro = percpu_getref(ipforward_rt_percpu);
                   1204:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1205:        if (rt == NULL) {
                   1206:                percpu_putref(ipforward_rt_percpu);
                   1207:                return NULL;
                   1208:        }
                   1209:
1.346     ozaki-r  1210:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1211:        rtcache_unref(rt, ro);
1.340     ozaki-r  1212:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1213:
                   1214:        return ifatoia(rt->rt_ifa);
1.1       cgd      1215: }
                   1216:
                   1217: /*
1.311     rmind    1218:  * save_rte: save incoming source route for use in replies, to be picked
                   1219:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1220:  */
1.311     rmind    1221: static void
1.354     ozaki-r  1222: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1223: {
1.354     ozaki-r  1224:        struct ip_srcrt *isr;
                   1225:        struct m_tag *mtag;
1.1       cgd      1226:        unsigned olen;
                   1227:
                   1228:        olen = option[IPOPT_OLEN];
1.354     ozaki-r  1229:        if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
                   1230:                return;
                   1231:
                   1232:        mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
                   1233:        if (mtag == NULL)
1.1       cgd      1234:                return;
1.354     ozaki-r  1235:        isr = (struct ip_srcrt *)(mtag + 1);
                   1236:
                   1237:        memcpy(isr->isr_hdr, option, olen);
                   1238:        isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1239:        isr->isr_dst = dst;
                   1240:        m_tag_prepend(m, mtag);
1.1       cgd      1241: }
                   1242:
                   1243: /*
                   1244:  * Retrieve incoming source route for use in replies,
                   1245:  * in the same form used by setsockopt.
                   1246:  * The first hop is placed before the options, will be removed later.
                   1247:  */
                   1248: struct mbuf *
1.354     ozaki-r  1249: ip_srcroute(struct mbuf *m0)
1.1       cgd      1250: {
1.109     augustss 1251:        struct in_addr *p, *q;
                   1252:        struct mbuf *m;
1.354     ozaki-r  1253:        struct ip_srcrt *isr;
                   1254:        struct m_tag *mtag;
                   1255:
                   1256:        mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
                   1257:        if (mtag == NULL)
                   1258:                return NULL;
                   1259:        isr = (struct ip_srcrt *)(mtag + 1);
1.1       cgd      1260:
1.354     ozaki-r  1261:        if (isr->isr_nhops == 0)
1.237     dyoung   1262:                return NULL;
1.354     ozaki-r  1263:
1.1       cgd      1264:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.354     ozaki-r  1265:        if (m == NULL)
1.237     dyoung   1266:                return NULL;
1.1       cgd      1267:
1.164     matt     1268:        MCLAIM(m, &inetdomain.dom_mowner);
1.354     ozaki-r  1269: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1270:
1.354     ozaki-r  1271:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
                   1272:        m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1       cgd      1273:
                   1274:        /*
                   1275:         * First save first hop for return route
                   1276:         */
1.354     ozaki-r  1277:        p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1       cgd      1278:        *(mtod(m, struct in_addr *)) = *p--;
                   1279:
                   1280:        /*
                   1281:         * Copy option fields and padding (nop) to mbuf.
                   1282:         */
1.354     ozaki-r  1283:        isr->isr_nop = IPOPT_NOP;
                   1284:        isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1285:        memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244     christos 1286:            OPTSIZ);
                   1287:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1288:            sizeof(struct in_addr) + OPTSIZ);
                   1289: #undef OPTSIZ
                   1290:        /*
                   1291:         * Record return path as an IP source route,
                   1292:         * reversing the path (pointers are now aligned).
                   1293:         */
1.354     ozaki-r  1294:        while (p >= isr->isr_routes) {
1.1       cgd      1295:                *q++ = *p--;
                   1296:        }
                   1297:        /*
                   1298:         * Last hop goes to final destination.
                   1299:         */
1.354     ozaki-r  1300:        *q = isr->isr_dst;
                   1301:        m_tag_delete(m0, mtag);
                   1302:        return m;
1.1       cgd      1303: }
                   1304:
1.139     matt     1305: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1306:        [PRC_MSGSIZE] = EMSGSIZE,
                   1307:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1308:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1309:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1310:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1311:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1312:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1313:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1314:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1315: };
                   1316:
1.295     dyoung   1317: void
                   1318: ip_fasttimo(void)
                   1319: {
                   1320:        if (ip_drainwanted) {
                   1321:                ip_drain();
                   1322:                ip_drainwanted = 0;
                   1323:        }
                   1324: }
                   1325:
                   1326: void
                   1327: ip_drainstub(void)
                   1328: {
                   1329:        ip_drainwanted = 1;
                   1330: }
                   1331:
1.1       cgd      1332: /*
                   1333:  * Forward a packet.  If some error occurs return the sender
                   1334:  * an icmp packet.  Note we can't always generate a meaningful
                   1335:  * icmp message because icmp doesn't have a large enough repertoire
                   1336:  * of codes and types.
                   1337:  *
                   1338:  * If not forwarding, just drop the packet.  This could be confusing
                   1339:  * if ipforwarding was zero but some routing protocol was advancing
                   1340:  * us as a gateway to somewhere.  However, we must let the routing
                   1341:  * protocol deal with that.
                   1342:  *
                   1343:  * The srcrt parameter indicates whether the packet is being forwarded
                   1344:  * via a source route.
                   1345:  */
1.313     rmind    1346: static void
1.329     ozaki-r  1347: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1348: {
1.109     augustss 1349:        struct ip *ip = mtod(m, struct ip *);
                   1350:        struct rtentry *rt;
1.220     christos 1351:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1352:        struct mbuf *mcopy;
1.13      mycroft  1353:        n_long dest;
1.249     dyoung   1354:        union {
                   1355:                struct sockaddr         dst;
                   1356:                struct sockaddr_in      dst4;
                   1357:        } u;
1.320     ozaki-r  1358:        uint64_t *ips;
1.340     ozaki-r  1359:        struct route *ro;
1.164     matt     1360:
1.318     rmind    1361:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1362:            "interrupt handler; synchronization assumptions violated");
                   1363:
1.164     matt     1364:        /*
                   1365:         * We are now in the output path.
                   1366:         */
                   1367:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1368:
                   1369:        /*
                   1370:         * Clear any in-bound checksum flags for this packet.
                   1371:         */
                   1372:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1373:
1.13      mycroft  1374:        dest = 0;
1.93      sommerfe 1375:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1376:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1377:                m_freem(m);
                   1378:                return;
                   1379:        }
1.318     rmind    1380:
1.1       cgd      1381:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1382:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1383:                return;
                   1384:        }
                   1385:
1.249     dyoung   1386:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1387:
1.340     ozaki-r  1388:        ro = percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1389:        rt = rtcache_lookup(ro, &u.dst);
                   1390:        if (rt == NULL) {
1.340     ozaki-r  1391:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1392:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1393:                return;
1.1       cgd      1394:        }
                   1395:
                   1396:        /*
1.34      mycroft  1397:         * Save at most 68 bytes of the packet in case
1.1       cgd      1398:         * we need to generate an ICMP message to the src.
1.119     itojun   1399:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1400:         */
1.155     itojun   1401:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1402:        if (mcopy)
                   1403:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1404:
1.221     christos 1405:        ip->ip_ttl -= IPTTLDEC;
                   1406:
1.1       cgd      1407:        /*
                   1408:         * If forwarding packet using same interface that it came in on,
                   1409:         * perhaps should send a redirect to sender to shortcut a hop.
                   1410:         * Only send redirect if source is sending directly to us,
                   1411:         * and if packet was not source routed (or has any options).
                   1412:         * Also, don't send redirect if forwarding using a default route
                   1413:         * or a route modified by a redirect.
                   1414:         */
1.329     ozaki-r  1415:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1416:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1417:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1418:            ipsendredirects && !srcrt) {
1.19      mycroft  1419:                if (rt->rt_ifa &&
                   1420:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1421:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1422:                        if (rt->rt_flags & RTF_GATEWAY)
                   1423:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1424:                        else
                   1425:                                dest = ip->ip_dst.s_addr;
                   1426:                        /*
                   1427:                         * Router requirements says to only send host
                   1428:                         * redirects.
                   1429:                         */
                   1430:                        type = ICMP_REDIRECT;
                   1431:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1432:                }
                   1433:        }
1.345     ozaki-r  1434:        rtcache_unref(rt, ro);
1.1       cgd      1435:
1.340     ozaki-r  1436:        error = ip_output(m, NULL, ro,
1.173     jonathan 1437:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1438:            NULL, NULL);
1.173     jonathan 1439:
1.320     ozaki-r  1440:        if (error) {
1.266     thorpej  1441:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1442:                goto error;
                   1443:        }
                   1444:
                   1445:        ips = IP_STAT_GETREF();
                   1446:        ips[IP_STAT_FORWARD]++;
                   1447:
                   1448:        if (type) {
                   1449:                ips[IP_STAT_REDIRECTSENT]++;
                   1450:                IP_STAT_PUTREF();
                   1451:                goto redirect;
                   1452:        }
                   1453:
                   1454:        IP_STAT_PUTREF();
                   1455:        if (mcopy) {
1.63      matt     1456: #ifdef GATEWAY
1.320     ozaki-r  1457:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1458:                        ipflow_create(ro, mcopy);
1.63      matt     1459: #endif
1.320     ozaki-r  1460:                m_freem(mcopy);
1.1       cgd      1461:        }
1.320     ozaki-r  1462:
1.340     ozaki-r  1463:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1464:        return;
                   1465:
                   1466: redirect:
                   1467: error:
1.318     rmind    1468:        if (mcopy == NULL) {
1.340     ozaki-r  1469:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1470:                return;
1.318     rmind    1471:        }
1.13      mycroft  1472:
1.1       cgd      1473:        switch (error) {
                   1474:
                   1475:        case 0:                         /* forwarded, but need redirect */
                   1476:                /* type, code set above */
                   1477:                break;
                   1478:
                   1479:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1480:        case EHOSTUNREACH:
                   1481:        case ENETDOWN:
                   1482:        case EHOSTDOWN:
                   1483:        default:
                   1484:                type = ICMP_UNREACH;
                   1485:                code = ICMP_UNREACH_HOST;
                   1486:                break;
                   1487:
                   1488:        case EMSGSIZE:
                   1489:                type = ICMP_UNREACH;
                   1490:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1491:
1.345     ozaki-r  1492:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1493:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1494:                        rtcache_unref(rt, ro);
                   1495:                }
1.305     rmind    1496: #ifdef IPSEC
1.317     christos 1497:                if (ipsec_used)
                   1498:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1499: #endif
1.266     thorpej  1500:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1501:                break;
                   1502:
                   1503:        case ENOBUFS:
1.143     itojun   1504:                /*
1.311     rmind    1505:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1506:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1507:                 * big problem under DoS attacks or if the underlying
                   1508:                 * interface is rate-limited.
1.143     itojun   1509:                 */
                   1510:                if (mcopy)
                   1511:                        m_freem(mcopy);
1.340     ozaki-r  1512:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1513:                return;
1.1       cgd      1514:        }
1.220     christos 1515:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1516:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1517: }
                   1518:
                   1519: void
1.211     perry    1520: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1521:     struct mbuf *m)
1.44      thorpej  1522: {
1.311     rmind    1523:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1524:        ifnet_t *ifp;
1.311     rmind    1525:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1526:        struct psref psref;
1.44      thorpej  1527:
1.329     ozaki-r  1528:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1529:        if (__predict_false(ifp == NULL))
                   1530:                return; /* XXX should report error? */
                   1531:
1.311     rmind    1532:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1533: #ifdef SO_OTIMESTAMP
1.311     rmind    1534:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1535: #endif
                   1536:            ) {
1.44      thorpej  1537:                struct timeval tv;
                   1538:
                   1539:                microtime(&tv);
1.278     christos 1540: #ifdef SO_OTIMESTAMP
1.311     rmind    1541:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1542:                        struct timeval50 tv50;
                   1543:                        timeval_to_timeval50(&tv, &tv50);
                   1544:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1545:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1546:                } else
                   1547: #endif
1.244     christos 1548:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1549:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1550:                if (*mp)
                   1551:                        mp = &(*mp)->m_next;
                   1552:        }
1.311     rmind    1553:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1554:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1555:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1556:                if (*mp)
                   1557:                        mp = &(*mp)->m_next;
                   1558:        }
1.311     rmind    1559:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1560:                struct in_pktinfo ipi;
1.307     christos 1561:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1562:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1563:                *mp = sbcreatecontrol((void *) &ipi,
                   1564:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1565:                if (*mp)
                   1566:                        mp = &(*mp)->m_next;
                   1567:        }
1.311     rmind    1568:        if (inpflags & INP_PKTINFO) {
1.306     christos 1569:                struct in_pktinfo ipi;
1.307     christos 1570:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1571:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1572:                *mp = sbcreatecontrol((void *) &ipi,
                   1573:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1574:                if (*mp)
                   1575:                        mp = &(*mp)->m_next;
                   1576:        }
1.311     rmind    1577:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1578:                struct sockaddr_dl sdl;
                   1579:
1.337     ozaki-r  1580:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1581:                    NULL, 0);
1.251     dyoung   1582:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1583:                if (*mp)
                   1584:                        mp = &(*mp)->m_next;
                   1585:        }
1.311     rmind    1586:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1587:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1588:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1589:                if (*mp)
                   1590:                        mp = &(*mp)->m_next;
                   1591:        }
1.329     ozaki-r  1592:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1593: }
                   1594:
1.189     atatat   1595: /*
1.228     elad     1596:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1597:  */
                   1598: static int
                   1599: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1600: {
                   1601:        int error, tmp;
                   1602:        struct sysctlnode node;
                   1603:
                   1604:        node = *rnode;
                   1605:        tmp = ip_forwsrcrt;
                   1606:        node.sysctl_data = &tmp;
                   1607:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1608:        if (error || newp == NULL)
                   1609:                return (error);
                   1610:
1.280     elad     1611:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1612:            0, NULL, NULL, NULL);
                   1613:        if (error)
                   1614:                return (error);
1.228     elad     1615:
                   1616:        ip_forwsrcrt = tmp;
                   1617:
                   1618:        return (0);
                   1619: }
                   1620:
                   1621: /*
1.189     atatat   1622:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1623:  * range of the new value and tweaks timers if it changes.
                   1624:  */
                   1625: static int
                   1626: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1627: {
1.189     atatat   1628:        int error, tmp;
                   1629:        struct sysctlnode node;
                   1630:
1.350     ozaki-r  1631:        icmp_mtudisc_lock();
                   1632:
1.189     atatat   1633:        node = *rnode;
                   1634:        tmp = ip_mtudisc_timeout;
                   1635:        node.sysctl_data = &tmp;
                   1636:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1637:        if (error || newp == NULL)
1.350     ozaki-r  1638:                goto out;
                   1639:        if (tmp < 0) {
                   1640:                error = EINVAL;
                   1641:                goto out;
                   1642:        }
1.273     matt     1643:
1.189     atatat   1644:        ip_mtudisc_timeout = tmp;
                   1645:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350     ozaki-r  1646:        error = 0;
                   1647: out:
                   1648:        icmp_mtudisc_unlock();
1.351     ozaki-r  1649:        return error;
1.189     atatat   1650: }
1.54      lukem    1651:
1.266     thorpej  1652: static int
                   1653: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1654: {
                   1655:
1.271     thorpej  1656:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1657: }
1.131     itojun   1658:
1.284     pooka    1659: static void
                   1660: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1661: {
1.197     atatat   1662:        sysctl_createv(clog, 0, NULL, NULL,
                   1663:                       CTLFLAG_PERMANENT,
1.203     atatat   1664:                       CTLTYPE_NODE, "inet",
                   1665:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1666:                       NULL, 0, NULL, 0,
                   1667:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1668:        sysctl_createv(clog, 0, NULL, NULL,
                   1669:                       CTLFLAG_PERMANENT,
1.203     atatat   1670:                       CTLTYPE_NODE, "ip",
                   1671:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1672:                       NULL, 0, NULL, 0,
                   1673:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1674:
1.197     atatat   1675:        sysctl_createv(clog, 0, NULL, NULL,
                   1676:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1677:                       CTLTYPE_INT, "forwarding",
                   1678:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1679:                       NULL, 0, &ipforwarding, 0,
                   1680:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1681:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1682:        sysctl_createv(clog, 0, NULL, NULL,
                   1683:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1684:                       CTLTYPE_INT, "redirect",
                   1685:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1686:                       NULL, 0, &ipsendredirects, 0,
                   1687:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1688:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1689:        sysctl_createv(clog, 0, NULL, NULL,
                   1690:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1691:                       CTLTYPE_INT, "ttl",
                   1692:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1693:                       NULL, 0, &ip_defttl, 0,
                   1694:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1695:                       IPCTL_DEFTTL, CTL_EOL);
                   1696: #ifdef IPCTL_DEFMTU
1.197     atatat   1697:        sysctl_createv(clog, 0, NULL, NULL,
                   1698:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1699:                       CTLTYPE_INT, "mtu",
                   1700:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1701:                       NULL, 0, &ip_mtu, 0,
                   1702:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1703:                       IPCTL_DEFMTU, CTL_EOL);
                   1704: #endif /* IPCTL_DEFMTU */
1.197     atatat   1705:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1706:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1707:                       CTLTYPE_INT, "forwsrcrt",
                   1708:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1709:                                    "datagrams"),
1.228     elad     1710:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1711:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1712:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1713:        sysctl_createv(clog, 0, NULL, NULL,
                   1714:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1715:                       CTLTYPE_INT, "directed-broadcast",
                   1716:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1717:                       NULL, 0, &ip_directedbcast, 0,
                   1718:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1719:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1720:        sysctl_createv(clog, 0, NULL, NULL,
                   1721:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1722:                       CTLTYPE_INT, "allowsrcrt",
                   1723:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1724:                       NULL, 0, &ip_allowsrcrt, 0,
                   1725:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1726:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1727:
1.197     atatat   1728:        sysctl_createv(clog, 0, NULL, NULL,
                   1729:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1730:                       CTLTYPE_INT, "mtudisc",
                   1731:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1732:                       NULL, 0, &ip_mtudisc, 0,
                   1733:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1734:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1737:                       CTLTYPE_INT, "anonportmin",
                   1738:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1739:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1740:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1741:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1742:        sysctl_createv(clog, 0, NULL, NULL,
                   1743:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1744:                       CTLTYPE_INT, "anonportmax",
                   1745:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1746:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1747:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1748:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1749:        sysctl_createv(clog, 0, NULL, NULL,
                   1750:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1751:                       CTLTYPE_INT, "mtudisctimeout",
                   1752:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1753:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1754:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1755:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1756: #ifndef IPNOPRIVPORTS
1.197     atatat   1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1759:                       CTLTYPE_INT, "lowportmin",
                   1760:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1761:                                    "to assign"),
1.189     atatat   1762:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1763:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1764:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1765:        sysctl_createv(clog, 0, NULL, NULL,
                   1766:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1767:                       CTLTYPE_INT, "lowportmax",
                   1768:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1769:                                    "to assign"),
1.189     atatat   1770:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1771:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1772:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1773: #endif /* IPNOPRIVPORTS */
                   1774: #if NGRE > 0
1.197     atatat   1775:        sysctl_createv(clog, 0, NULL, NULL,
                   1776:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1777:                       CTLTYPE_INT, "grettl",
                   1778:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1779:                       NULL, 0, &ip_gre_ttl, 0,
                   1780:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1781:                       IPCTL_GRE_TTL, CTL_EOL);
                   1782: #endif /* NGRE */
1.197     atatat   1783:        sysctl_createv(clog, 0, NULL, NULL,
                   1784:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1785:                       CTLTYPE_INT, "checkinterface",
                   1786:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1787:                                    "from RFC1122"),
1.189     atatat   1788:                       NULL, 0, &ip_checkinterface, 0,
                   1789:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1790:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1791:        sysctl_createv(clog, 0, NULL, NULL,
                   1792:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1793:                       CTLTYPE_INT, "random_id",
                   1794:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1795:                       NULL, 0, &ip_do_randomid, 0,
                   1796:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1797:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1798:        sysctl_createv(clog, 0, NULL, NULL,
                   1799:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1800:                       CTLTYPE_INT, "do_loopback_cksum",
                   1801:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1802:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1803:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1804:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1805:        sysctl_createv(clog, 0, NULL, NULL,
                   1806:                       CTLFLAG_PERMANENT,
                   1807:                       CTLTYPE_STRUCT, "stats",
                   1808:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1809:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1810:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1811:                       CTL_EOL);
1.322     joerg    1812: #if NARP
1.321     roy      1813:        sysctl_createv(clog, 0, NULL, NULL,
                   1814:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1815:                       CTLTYPE_INT, "dad_count",
                   1816:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1817:                                    "probes to send"),
                   1818:                       NULL, 0, &ip_dad_count, 0,
                   1819:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1820:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1821: #endif
1.301     christos 1822:
                   1823:        /* anonportalgo RFC6056 subtree */
1.302     christos 1824:        const struct sysctlnode *portalgo_node;
                   1825:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1826:                       CTLFLAG_PERMANENT,
                   1827:                       CTLTYPE_NODE, "anonportalgo",
                   1828:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1829:                       NULL, 0, NULL, 0,
                   1830:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1831:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1832:                       CTLFLAG_PERMANENT,
                   1833:                       CTLTYPE_STRING, "available",
                   1834:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1835:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1836:                       CTL_CREATE, CTL_EOL);
1.302     christos 1837:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1838:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1839:                       CTLTYPE_STRING, "selected",
                   1840:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1841:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1842:                       CTL_CREATE, CTL_EOL);
                   1843:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1844:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1845:                       CTLTYPE_STRUCT, "reserve",
                   1846:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1847:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1848:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1849: }
1.266     thorpej  1850:
                   1851: void
                   1852: ip_statinc(u_int stat)
                   1853: {
                   1854:
                   1855:        KASSERT(stat < IP_NSTATS);
                   1856:        IP_STATINC(stat);
                   1857: }

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