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Annotation of src/sys/netinet/ip_input.c, Revision 1.337.2.5

1.337.2.5! pgoyette    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>
1.337.2.5! pgoyette   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"
1.337.2.2  pgoyette  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:
                    229: static struct route    ipforward_rt            __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: /*
1.337.2.5! pgoyette  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:  */
1.337.2.5! pgoyette  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:
1.337.2.5! pgoyette  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 *);
1.337.2.3  pgoyette  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:
1.337.2.2  pgoyette  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))
1.337.2.2  pgoyette  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);
1.337.2.4  pgoyette  345:
                    346:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
                    347:        if (ipforward_rt_percpu == NULL)
                    348:                panic("failed to allocate ipforward_rt_percpu");
                    349:
                    350:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       351: }
                    352:
1.333     ozaki-r   353: static struct in_ifaddr *
                    354: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    355: {
                    356:        struct in_ifaddr *ia = NULL;
                    357:        int checkif;
                    358:
                    359:        /*
                    360:         * Enable a consistency check between the destination address
                    361:         * and the arrival interface for a unicast packet (the RFC 1122
                    362:         * strong ES model) if IP forwarding is disabled and the packet
                    363:         * is not locally generated.
                    364:         *
                    365:         * XXX - Checking also should be disabled if the destination
                    366:         * address is ipnat'ed to a different interface.
                    367:         *
                    368:         * XXX - Checking is incompatible with IP aliases added
                    369:         * to the loopback interface instead of the interface where
                    370:         * the packets are received.
                    371:         *
                    372:         * XXX - We need to add a per ifaddr flag for this so that
                    373:         * we get finer grain control.
                    374:         */
                    375:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    376:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    377:
1.334     ozaki-r   378:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   379:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    380:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    381:                                continue;
                    382:                        if (checkif && ia->ia_ifp != ifp)
                    383:                                continue;
                    384:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    385:                                break;
                    386:                        else
1.337.2.1  pgoyette  387:                                (*downmatch)++;
1.333     ozaki-r   388:                }
                    389:        }
                    390:
                    391:        return ia;
                    392: }
                    393:
                    394: static struct in_ifaddr *
                    395: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    396: {
                    397:        struct in_ifaddr *ia = NULL;
                    398:        struct ifaddr *ifa;
                    399:
1.336     ozaki-r   400:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   401:                if (ifa->ifa_addr->sa_family != AF_INET)
                    402:                        continue;
                    403:                ia = ifatoia(ifa);
                    404:                if (ia->ia4_flags & IN_IFF_NOTREADY)
                    405:                        continue;
                    406:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    407:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    408:                    /*
                    409:                     * Look for all-0's host part (old broadcast addr),
                    410:                     * either for subnet or net.
                    411:                     */
                    412:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    413:                    ip->ip_dst.s_addr == ia->ia_net)
                    414:                        goto matched;
                    415:                /*
                    416:                 * An interface with IP address zero accepts
                    417:                 * all packets that arrive on that interface.
                    418:                 */
                    419:                if (in_nullhost(ia->ia_addr.sin_addr))
                    420:                        goto matched;
                    421:        }
                    422:        ia = NULL;
                    423:
                    424: matched:
                    425:        return ia;
                    426: }
                    427:
1.1       cgd       428: /*
1.318     rmind     429:  * IP software interrupt routine.
1.89      itojun    430:  */
1.318     rmind     431: static void
                    432: ipintr(void *arg __unused)
1.89      itojun    433: {
                    434:        struct mbuf *m;
1.286     tls       435:
1.318     rmind     436:        KASSERT(cpu_softintr_p());
1.89      itojun    437:
1.337.2.2  pgoyette  438: #ifndef NET_MPSAFE
1.268     ad        439:        mutex_enter(softnet_lock);
1.337.2.2  pgoyette  440: #endif
1.318     rmind     441:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    442:                ip_input(m);
                    443:        }
1.337.2.2  pgoyette  444: #ifndef NET_MPSAFE
1.268     ad        445:        mutex_exit(softnet_lock);
1.337.2.2  pgoyette  446: #endif
1.89      itojun    447: }
                    448:
                    449: /*
1.318     rmind     450:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       451:  * try to reassemble.  Process options.  Pass to next level.
                    452:  */
1.312     rmind     453: static void
1.89      itojun    454: ip_input(struct mbuf *m)
1.1       cgd       455: {
1.109     augustss  456:        struct ip *ip = NULL;
1.337.2.1  pgoyette  457:        struct in_ifaddr *ia = NULL;
1.288     rmind     458:        int hlen = 0, len;
1.100     itojun    459:        int downmatch;
1.169     itojun    460:        int srcrt = 0;
1.314     rmind     461:        ifnet_t *ifp;
1.329     ozaki-r   462:        struct psref psref;
1.337.2.1  pgoyette  463:        int s;
1.1       cgd       464:
1.318     rmind     465:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    466:            "interrupt handler; synchronization assumptions violated");
                    467:
1.164     matt      468:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     469:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   470:
                    471:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   472:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   473:                goto out;
1.164     matt      474:
1.1       cgd       475:        /*
                    476:         * If no IP addresses have been set yet but the interfaces
                    477:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     478:         * Note: we pre-check without locks held.
1.1       cgd       479:         */
1.335     ozaki-r   480:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   481:                goto out;
1.266     thorpej   482:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     483:
1.154     thorpej   484:        /*
                    485:         * If the IP header is not aligned, slurp it up into a new
                    486:         * mbuf with space for link headers, in the event we forward
                    487:         * it.  Otherwise, if it is aligned, make sure the entire
                    488:         * base IP header is in the first mbuf of the chain.
                    489:         */
1.244     christos  490:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   491:                if ((m = m_copyup(m, sizeof(struct ip),
                    492:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    493:                        /* XXXJRT new stat, please */
1.266     thorpej   494:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   495:                        goto out;
1.154     thorpej   496:                }
                    497:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    498:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   499:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   500:                        goto out;
1.154     thorpej   501:                }
1.1       cgd       502:        }
                    503:        ip = mtod(m, struct ip *);
1.13      mycroft   504:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   505:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   506:                goto out;
1.13      mycroft   507:        }
1.1       cgd       508:        hlen = ip->ip_hl << 2;
                    509:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   510:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   511:                goto out;
1.1       cgd       512:        }
                    513:        if (hlen > m->m_len) {
1.298     liamjfoy  514:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   515:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   516:                        goto out;
1.1       cgd       517:                }
                    518:                ip = mtod(m, struct ip *);
                    519:        }
1.98      thorpej   520:
1.85      hwr       521:        /*
1.99      thorpej   522:         * RFC1122: packets with a multicast source address are
1.98      thorpej   523:         * not allowed.
1.85      hwr       524:         */
                    525:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   526:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   527:                goto out;
1.129     itojun    528:        }
                    529:
                    530:        /* 127/8 must not appear on wire - RFC1122 */
                    531:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    532:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     533:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   534:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   535:                        goto out;
1.130     itojun    536:                }
1.85      hwr       537:        }
                    538:
1.135     thorpej   539:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     540:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   541:                 M_CSUM_IPv4_BAD)) {
                    542:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    543:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   544:                IP_STATINC(IP_STAT_BADSUM);
                    545:                goto out;
1.135     thorpej   546:
                    547:        case M_CSUM_IPv4:
                    548:                /* Checksum was okay. */
                    549:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    550:                break;
                    551:
                    552:        default:
1.206     thorpej   553:                /*
                    554:                 * Must compute it ourselves.  Maybe skip checksum on
                    555:                 * loopback interfaces.
                    556:                 */
1.314     rmind     557:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    558:                    ip_do_loopback_cksum)) {
1.206     thorpej   559:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   560:                        if (in_cksum(m, hlen) != 0) {
                    561:                                IP_STATINC(IP_STAT_BADSUM);
                    562:                                goto out;
                    563:                        }
1.206     thorpej   564:                }
1.135     thorpej   565:                break;
1.1       cgd       566:        }
                    567:
1.121     thorpej   568:        /* Retrieve the packet length. */
                    569:        len = ntohs(ip->ip_len);
1.81      proff     570:
                    571:        /*
                    572:         * Check for additional length bogosity
                    573:         */
1.84      proff     574:        if (len < hlen) {
1.266     thorpej   575:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   576:                goto out;
1.81      proff     577:        }
1.1       cgd       578:
                    579:        /*
                    580:         * Check that the amount of data in the buffers
                    581:         * is as at least much as the IP header would have us expect.
                    582:         * Trim mbufs if longer than we expect.
                    583:         * Drop packet if shorter than we expect.
                    584:         */
1.35      mycroft   585:        if (m->m_pkthdr.len < len) {
1.266     thorpej   586:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   587:                goto out;
1.1       cgd       588:        }
1.35      mycroft   589:        if (m->m_pkthdr.len > len) {
1.1       cgd       590:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   591:                        m->m_len = len;
                    592:                        m->m_pkthdr.len = len;
1.1       cgd       593:                } else
1.35      mycroft   594:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       595:        }
                    596:
1.64      thorpej   597:        /*
                    598:         * Assume that we can create a fast-forward IP flow entry
                    599:         * based on this packet.
                    600:         */
                    601:        m->m_flags |= M_CANFASTFWD;
                    602:
1.33      mrg       603:        /*
1.64      thorpej   604:         * Run through list of hooks for input packets.  If there are any
                    605:         * filters which require that additional packets in the flow are
                    606:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    607:         * Note that filters must _never_ set this flag, as another filter
                    608:         * in the list may have previously cleared it.
1.33      mrg       609:         */
1.304     christos  610: #if defined(IPSEC)
1.317     christos  611:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    612: #else
                    613:        if (1)
                    614: #endif
                    615:        {
1.314     rmind     616:                struct in_addr odst = ip->ip_dst;
1.318     rmind     617:                bool freed;
1.169     itojun    618:
1.318     rmind     619:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    620:                if (freed || m == NULL) {
1.337.2.2  pgoyette  621:                        m = NULL;
1.329     ozaki-r   622:                        goto out;
1.318     rmind     623:                }
1.127     itojun    624:                ip = mtod(m, struct ip *);
1.142     darrenr   625:                hlen = ip->ip_hl << 2;
1.318     rmind     626:
1.205     darrenr   627:                /*
                    628:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    629:                 * from generating ICMP redirects for packets that have
                    630:                 * been redirected by a hook back out on to the same LAN that
                    631:                 * they came from and is not an indication that the packet
                    632:                 * is being inffluenced by source routing options.  This
                    633:                 * allows things like
                    634:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    635:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    636:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    637:                 * also requires a "map tlp0 ..." to complete the story.
                    638:                 * One might argue whether or not this kind of network config.
1.212     perry     639:                 * should be supported in this manner...
1.205     darrenr   640:                 */
1.169     itojun    641:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    642:        }
1.123     thorpej   643:
                    644: #ifdef ALTQ
                    645:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     646:        if (altq_input) {
                    647:                SOFTNET_LOCK();
                    648:                if ((*altq_input)(m, AF_INET) == 0) {
                    649:                        /* Packet dropped by traffic conditioner. */
                    650:                        SOFTNET_UNLOCK();
1.337.2.2  pgoyette  651:                        m = NULL;
1.329     ozaki-r   652:                        goto out;
1.318     rmind     653:                }
                    654:                SOFTNET_UNLOCK();
1.123     thorpej   655:        }
                    656: #endif
1.121     thorpej   657:
                    658:        /*
1.1       cgd       659:         * Process options and, if not destined for us,
                    660:         * ship it on.  ip_dooptions returns 1 when an
                    661:         * error was detected (causing an icmp message
                    662:         * to be sent and the original packet to be freed).
                    663:         */
1.337.2.2  pgoyette  664:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    665:                m = NULL;
1.329     ozaki-r   666:                goto out;
1.337.2.2  pgoyette  667:        }
1.1       cgd       668:
                    669:        /*
                    670:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    671:         *
                    672:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    673:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       674:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       675:         */
1.100     itojun    676:        downmatch = 0;
1.337.2.1  pgoyette  677:        s = pserialize_read_enter();
1.333     ozaki-r   678:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.337.2.1  pgoyette  679:        if (ia != NULL) {
                    680:                pserialize_read_exit(s);
1.86      thorpej   681:                goto ours;
1.337.2.1  pgoyette  682:        }
1.333     ozaki-r   683:
1.315     christos  684:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   685:                ia = ip_match_our_address_broadcast(ifp, ip);
1.337.2.1  pgoyette  686:                if (ia != NULL) {
                    687:                        pserialize_read_exit(s);
1.333     ozaki-r   688:                        goto ours;
1.337.2.1  pgoyette  689:                }
1.1       cgd       690:        }
1.337.2.1  pgoyette  691:        pserialize_read_exit(s);
1.333     ozaki-r   692:
1.18      mycroft   693:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   694: #ifdef MROUTING
                    695:                extern struct socket *ip_mrouter;
1.10      brezak    696:
1.4       hpeyerl   697:                if (ip_mrouter) {
                    698:                        /*
                    699:                         * If we are acting as a multicast router, all
                    700:                         * incoming multicast packets are passed to the
                    701:                         * kernel-level multicast forwarding function.
                    702:                         * The packet is returned (relatively) intact; if
                    703:                         * ip_mforward() returns a non-zero value, the packet
                    704:                         * must be discarded, else it may be accepted below.
                    705:                         *
                    706:                         * (The IP ident field is put in the same byte order
                    707:                         * as expected when ip_mforward() is called from
                    708:                         * ip_output().)
                    709:                         */
1.318     rmind     710:                        SOFTNET_LOCK();
1.314     rmind     711:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     712:                                SOFTNET_UNLOCK();
1.266     thorpej   713:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   714:                                goto out;
1.4       hpeyerl   715:                        }
1.318     rmind     716:                        SOFTNET_UNLOCK();
1.4       hpeyerl   717:
                    718:                        /*
                    719:                         * The process-level routing demon needs to receive
                    720:                         * all multicast IGMP packets, whether or not this
                    721:                         * host belongs to their destination groups.
                    722:                         */
1.318     rmind     723:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   724:                                goto ours;
1.318     rmind     725:                        }
1.266     thorpej   726:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   727:                }
                    728: #endif
                    729:                /*
                    730:                 * See if we belong to the destination multicast group on the
                    731:                 * arrival interface.
                    732:                 */
1.316     rmind     733:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   734:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   735:                        goto out;
1.4       hpeyerl   736:                }
                    737:                goto ours;
                    738:        }
1.19      mycroft   739:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   740:            in_nullhost(ip->ip_dst))
1.1       cgd       741:                goto ours;
                    742:
                    743:        /*
                    744:         * Not for us; forward if possible and desirable.
                    745:         */
                    746:        if (ipforwarding == 0) {
1.329     ozaki-r   747:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   748:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       749:                m_freem(m);
1.100     itojun    750:        } else {
                    751:                /*
                    752:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    753:                 * and there's no IFF_UP interface that matches ip_dst,
                    754:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    755:                 * forwarding loop till TTL goes to 0.
                    756:                 */
                    757:                if (downmatch) {
1.329     ozaki-r   758:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    759:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   760:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    761:                        return;
                    762:                }
1.304     christos  763: #ifdef IPSEC
1.305     rmind     764:                /* Perform IPsec, if any. */
1.318     rmind     765:                if (ipsec_used) {
                    766:                        SOFTNET_LOCK();
                    767:                        if (ipsec4_input(m, IP_FORWARDING |
                    768:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    769:                                SOFTNET_UNLOCK();
1.332     ozaki-r   770:                                goto out;
1.318     rmind     771:                        }
                    772:                        SOFTNET_UNLOCK();
1.173     jonathan  773:                }
1.305     rmind     774: #endif
1.329     ozaki-r   775:                ip_forward(m, srcrt, ifp);
                    776:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    777:        }
1.89      itojun    778:        return;
1.1       cgd       779:
                    780: ours:
1.329     ozaki-r   781:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   782:        ifp = NULL;
1.329     ozaki-r   783:
1.1       cgd       784:        /*
                    785:         * If offset or IP_MF are set, must reassemble.
                    786:         */
1.155     itojun    787:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     788:                /*
                    789:                 * Pass to IP reassembly mechanism.
                    790:                 */
1.290     rmind     791:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     792:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   793:                        goto out;
1.16      cgd       794:                }
1.290     rmind     795:                if (m == NULL) {
1.289     rmind     796:                        /* More fragments should come; silently return. */
1.332     ozaki-r   797:                        goto out;
1.289     rmind     798:                }
1.290     rmind     799:                /*
                    800:                 * Reassembly is done, we have the final packet.
                    801:                 * Updated cached data in local variable(s).
                    802:                 */
1.289     rmind     803:                ip = mtod(m, struct ip *);
                    804:                hlen = ip->ip_hl << 2;
1.79      mycroft   805:        }
1.128     itojun    806:
1.304     christos  807: #ifdef IPSEC
1.173     jonathan  808:        /*
1.305     rmind     809:         * Enforce IPsec policy checking if we are seeing last header.
                    810:         * Note that we do not visit this with protocols with PCB layer
                    811:         * code - like UDP/TCP/raw IP.
1.173     jonathan  812:         */
1.317     christos  813:        if (ipsec_used &&
1.328     riastrad  814:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318     rmind     815:                SOFTNET_LOCK();
1.305     rmind     816:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     817:                        SOFTNET_UNLOCK();
1.332     ozaki-r   818:                        goto out;
1.173     jonathan  819:                }
1.318     rmind     820:                SOFTNET_UNLOCK();
1.173     jonathan  821:        }
1.305     rmind     822: #endif
1.1       cgd       823:
                    824:        /*
                    825:         * Switch out to protocol's input routine.
                    826:         */
1.82      aidan     827: #if IFA_STATS
1.337.2.1  pgoyette  828:        if (ia && ip) {
                    829:                struct in_ifaddr *_ia;
                    830:                /*
                    831:                 * Keep a reference from ip_match_our_address with psref
                    832:                 * is expensive, so explore ia here again.
                    833:                 */
                    834:                s = pserialize_read_enter();
1.337.2.2  pgoyette  835:                _ia = in_get_ia(ip->ip_dst);
1.337.2.1  pgoyette  836:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    837:                pserialize_read_exit(s);
                    838:        }
1.82      aidan     839: #endif
1.266     thorpej   840:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    841:
1.318     rmind     842:        const int off = hlen, nh = ip->ip_p;
                    843:
                    844:        SOFTNET_LOCK();
1.328     riastrad  845:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     846:        SOFTNET_UNLOCK();
1.89      itojun    847:        return;
1.135     thorpej   848:
1.329     ozaki-r   849: out:
                    850:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   851:        if (m != NULL)
                    852:                m_freem(m);
1.1       cgd       853: }
                    854:
                    855: /*
1.288     rmind     856:  * IP timer processing.
1.1       cgd       857:  */
1.8       mycroft   858: void
1.211     perry     859: ip_slowtimo(void)
1.1       cgd       860: {
1.268     ad        861:
1.337.2.4  pgoyette  862: #ifndef NET_MPSAFE
1.268     ad        863:        mutex_enter(softnet_lock);
                    864:        KERNEL_LOCK(1, NULL);
1.337.2.4  pgoyette  865: #endif
1.1       cgd       866:
1.288     rmind     867:        ip_reass_slowtimo();
1.268     ad        868:
1.337.2.4  pgoyette  869: #ifndef NET_MPSAFE
1.268     ad        870:        KERNEL_UNLOCK_ONE(NULL);
                    871:        mutex_exit(softnet_lock);
1.337.2.4  pgoyette  872: #endif
1.1       cgd       873: }
                    874:
                    875: /*
1.288     rmind     876:  * IP drain processing.
1.1       cgd       877:  */
1.8       mycroft   878: void
1.211     perry     879: ip_drain(void)
1.1       cgd       880: {
                    881:
1.268     ad        882:        KERNEL_LOCK(1, NULL);
1.288     rmind     883:        ip_reass_drain();
1.268     ad        884:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       885: }
                    886:
                    887: /*
1.311     rmind     888:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    889:  * it if bad options are encountered, or forwarding it if source-routed.
                    890:  *
                    891:  * => Returns true if packet has been forwarded/freed.
                    892:  * => Returns false if the packet should be processed further.
1.1       cgd       893:  */
1.311     rmind     894: static bool
1.211     perry     895: ip_dooptions(struct mbuf *m)
1.1       cgd       896: {
1.109     augustss  897:        struct ip *ip = mtod(m, struct ip *);
                    898:        u_char *cp, *cp0;
                    899:        struct ip_timestamp *ipt;
                    900:        struct in_ifaddr *ia;
1.1       cgd       901:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   902:        struct in_addr dst;
1.1       cgd       903:        n_time ntime;
1.337.2.4  pgoyette  904:        struct ifaddr *ifa = NULL;
1.337.2.1  pgoyette  905:        int s;
1.1       cgd       906:
1.13      mycroft   907:        dst = ip->ip_dst;
1.1       cgd       908:        cp = (u_char *)(ip + 1);
                    909:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    910:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    911:                opt = cp[IPOPT_OPTVAL];
                    912:                if (opt == IPOPT_EOL)
                    913:                        break;
                    914:                if (opt == IPOPT_NOP)
                    915:                        optlen = 1;
                    916:                else {
1.113     itojun    917:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    918:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    919:                                goto bad;
                    920:                        }
1.1       cgd       921:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    922:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       923:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    924:                                goto bad;
                    925:                        }
                    926:                }
                    927:                switch (opt) {
                    928:
                    929:                default:
                    930:                        break;
                    931:
                    932:                /*
                    933:                 * Source routing with record.
                    934:                 * Find interface with current destination address.
                    935:                 * If none on this machine then drop if strictly routed,
                    936:                 * or do nothing if loosely routed.
                    937:                 * Record interface address and bring up next address
                    938:                 * component.  If strictly routed make sure next
                    939:                 * address is on directly accessible net.
                    940:                 */
                    941:                case IPOPT_LSRR:
1.337.2.3  pgoyette  942:                case IPOPT_SSRR: {
                    943:                        struct psref psref;
1.337.2.5! pgoyette  944:                        struct sockaddr_in ipaddr = {
        !           945:                            .sin_len = sizeof(ipaddr),
        !           946:                            .sin_family = AF_INET,
        !           947:                        };
        !           948:
1.47      cjs       949:                        if (ip_allowsrcrt == 0) {
                    950:                                type = ICMP_UNREACH;
                    951:                                code = ICMP_UNREACH_NET_PROHIB;
                    952:                                goto bad;
                    953:                        }
1.114     itojun    954:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    955:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    956:                                goto bad;
                    957:                        }
1.1       cgd       958:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    959:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    960:                                goto bad;
                    961:                        }
                    962:                        ipaddr.sin_addr = ip->ip_dst;
1.337.2.1  pgoyette  963:
                    964:                        s = pserialize_read_enter();
                    965:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    966:                        if (ifa == NULL) {
                    967:                                pserialize_read_exit(s);
1.1       cgd       968:                                if (opt == IPOPT_SSRR) {
                    969:                                        type = ICMP_UNREACH;
                    970:                                        code = ICMP_UNREACH_SRCFAIL;
                    971:                                        goto bad;
                    972:                                }
                    973:                                /*
                    974:                                 * Loose routing, and not at next destination
                    975:                                 * yet; nothing to do except forward.
                    976:                                 */
                    977:                                break;
                    978:                        }
1.337.2.1  pgoyette  979:                        pserialize_read_exit(s);
                    980:
1.1       cgd       981:                        off--;                  /* 0 origin */
1.112     sommerfe  982:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       983:                                /*
                    984:                                 * End of source route.  Should be for us.
                    985:                                 */
1.337.2.5! pgoyette  986:                                save_rte(m, cp, ip->ip_src);
1.1       cgd       987:                                break;
                    988:                        }
                    989:                        /*
                    990:                         * locate outgoing interface
                    991:                         */
1.281     tsutsui   992:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       993:                            sizeof(ipaddr.sin_addr));
1.337.2.1  pgoyette  994:                        if (opt == IPOPT_SSRR) {
1.337.2.3  pgoyette  995:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    996:                                    &psref);
1.337.2.1  pgoyette  997:                                if (ifa != NULL)
                    998:                                        ia = ifatoia(ifa);
                    999:                                else
                   1000:                                        ia = NULL;
                   1001:                        } else {
1.337.2.3  pgoyette 1002:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.337.2.1  pgoyette 1003:                        }
                   1004:                        if (ia == NULL) {
1.1       cgd      1005:                                type = ICMP_UNREACH;
                   1006:                                code = ICMP_UNREACH_SRCFAIL;
                   1007:                                goto bad;
                   1008:                        }
                   1009:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos 1010:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1011:                            (void *)(cp + off), sizeof(struct in_addr));
1.337.2.3  pgoyette 1012:                        ia4_release(ia, &psref);
1.1       cgd      1013:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft  1014:                        /*
                   1015:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1016:                         */
1.18      mycroft  1017:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1018:                        break;
1.337.2.3  pgoyette 1019:                    }
1.1       cgd      1020:
1.337.2.3  pgoyette 1021:                case IPOPT_RR: {
                   1022:                        struct psref psref;
1.337.2.5! pgoyette 1023:                        struct sockaddr_in ipaddr = {
        !          1024:                            .sin_len = sizeof(ipaddr),
        !          1025:                            .sin_family = AF_INET,
        !          1026:                        };
        !          1027:
1.114     itojun   1028:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1029:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1030:                                goto bad;
                   1031:                        }
1.1       cgd      1032:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1033:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1034:                                goto bad;
                   1035:                        }
                   1036:                        /*
                   1037:                         * If no space remains, ignore.
                   1038:                         */
                   1039:                        off--;                  /* 0 origin */
1.112     sommerfe 1040:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1041:                                break;
1.281     tsutsui  1042:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1043:                            sizeof(ipaddr.sin_addr));
                   1044:                        /*
                   1045:                         * locate outgoing interface; if we're the destination,
                   1046:                         * use the incoming interface (should be same).
                   1047:                         */
1.337.2.3  pgoyette 1048:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.337.2.1  pgoyette 1049:                        if (ifa == NULL) {
1.337.2.3  pgoyette 1050:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.337.2.1  pgoyette 1051:                                if (ia == NULL) {
                   1052:                                        type = ICMP_UNREACH;
                   1053:                                        code = ICMP_UNREACH_HOST;
                   1054:                                        goto bad;
                   1055:                                }
                   1056:                        } else {
                   1057:                                ia = ifatoia(ifa);
1.1       cgd      1058:                        }
1.244     christos 1059:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1060:                            (void *)(cp + off), sizeof(struct in_addr));
1.337.2.3  pgoyette 1061:                        ia4_release(ia, &psref);
1.1       cgd      1062:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1063:                        break;
1.337.2.3  pgoyette 1064:                    }
1.1       cgd      1065:
                   1066:                case IPOPT_TS:
                   1067:                        code = cp - (u_char *)ip;
                   1068:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1069:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1070:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1071:                                goto bad;
1.114     itojun   1072:                        }
                   1073:                        if (ipt->ipt_ptr < 5) {
                   1074:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1075:                                goto bad;
                   1076:                        }
1.15      cgd      1077:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1078:                                if (++ipt->ipt_oflw == 0) {
                   1079:                                        code = (u_char *)&ipt->ipt_ptr -
                   1080:                                            (u_char *)ip;
1.1       cgd      1081:                                        goto bad;
1.114     itojun   1082:                                }
1.1       cgd      1083:                                break;
                   1084:                        }
1.104     thorpej  1085:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1086:                        switch (ipt->ipt_flg) {
                   1087:
                   1088:                        case IPOPT_TS_TSONLY:
                   1089:                                break;
                   1090:
1.329     ozaki-r  1091:                        case IPOPT_TS_TSANDADDR: {
                   1092:                                struct ifnet *rcvif;
1.337.2.1  pgoyette 1093:                                int _s, _ss;
1.337.2.5! pgoyette 1094:                                struct sockaddr_in ipaddr = {
        !          1095:                                    .sin_len = sizeof(ipaddr),
        !          1096:                                    .sin_family = AF_INET,
        !          1097:                                };
1.329     ozaki-r  1098:
1.66      thorpej  1099:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1100:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1101:                                        code = (u_char *)&ipt->ipt_ptr -
                   1102:                                            (u_char *)ip;
1.1       cgd      1103:                                        goto bad;
1.114     itojun   1104:                                }
1.13      mycroft  1105:                                ipaddr.sin_addr = dst;
1.337.2.1  pgoyette 1106:                                _ss = pserialize_read_enter();
                   1107:                                rcvif = m_get_rcvif(m, &_s);
1.337.2.4  pgoyette 1108:                                if (__predict_true(rcvif != NULL)) {
                   1109:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1110:                                            rcvif);
                   1111:                                }
1.337.2.1  pgoyette 1112:                                m_put_rcvif(rcvif, &_s);
                   1113:                                if (ifa == NULL) {
                   1114:                                        pserialize_read_exit(_ss);
                   1115:                                        break;
                   1116:                                }
                   1117:                                ia = ifatoia(ifa);
1.104     thorpej  1118:                                bcopy(&ia->ia_addr.sin_addr,
                   1119:                                    cp0, sizeof(struct in_addr));
1.337.2.1  pgoyette 1120:                                pserialize_read_exit(_ss);
1.1       cgd      1121:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1122:                                break;
1.329     ozaki-r  1123:                        }
1.1       cgd      1124:
1.337.2.5! pgoyette 1125:                        case IPOPT_TS_PRESPEC: {
        !          1126:                                struct sockaddr_in ipaddr = {
        !          1127:                                    .sin_len = sizeof(ipaddr),
        !          1128:                                    .sin_family = AF_INET,
        !          1129:                                };
        !          1130:
1.66      thorpej  1131:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1132:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1133:                                        code = (u_char *)&ipt->ipt_ptr -
                   1134:                                            (u_char *)ip;
1.1       cgd      1135:                                        goto bad;
1.114     itojun   1136:                                }
1.281     tsutsui  1137:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1138:                                    sizeof(struct in_addr));
1.337.2.1  pgoyette 1139:                                s = pserialize_read_enter();
                   1140:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1141:                                if (ifa == NULL) {
                   1142:                                        pserialize_read_exit(s);
1.1       cgd      1143:                                        continue;
1.337.2.1  pgoyette 1144:                                }
                   1145:                                pserialize_read_exit(s);
1.1       cgd      1146:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1147:                                break;
1.337.2.5! pgoyette 1148:                            }
1.1       cgd      1149:
                   1150:                        default:
1.114     itojun   1151:                                /* XXX can't take &ipt->ipt_flg */
                   1152:                                code = (u_char *)&ipt->ipt_ptr -
                   1153:                                    (u_char *)ip + 1;
1.1       cgd      1154:                                goto bad;
                   1155:                        }
                   1156:                        ntime = iptime();
1.107     thorpej  1157:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1158:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1159:                            sizeof(n_time));
                   1160:                        ipt->ipt_ptr += sizeof(n_time);
                   1161:                }
                   1162:        }
                   1163:        if (forward) {
1.329     ozaki-r  1164:                struct ifnet *rcvif;
1.337.2.1  pgoyette 1165:                struct psref _psref;
1.329     ozaki-r  1166:
1.26      thorpej  1167:                if (ip_forwsrcrt == 0) {
                   1168:                        type = ICMP_UNREACH;
                   1169:                        code = ICMP_UNREACH_SRCFAIL;
                   1170:                        goto bad;
                   1171:                }
1.329     ozaki-r  1172:
1.337.2.1  pgoyette 1173:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1174:                if (__predict_false(rcvif == NULL)) {
                   1175:                        type = ICMP_UNREACH;
                   1176:                        code = ICMP_UNREACH_HOST;
                   1177:                        goto bad;
                   1178:                }
1.329     ozaki-r  1179:                ip_forward(m, 1, rcvif);
1.337.2.1  pgoyette 1180:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1181:                return true;
1.13      mycroft  1182:        }
1.311     rmind    1183:        return false;
1.1       cgd      1184: bad:
1.13      mycroft  1185:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1186:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1187:        return true;
1.1       cgd      1188: }
                   1189:
                   1190: /*
1.311     rmind    1191:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1192:  * return internet address info of interface to be used to get there.
                   1193:  */
1.311     rmind    1194: static struct in_ifaddr *
1.337.2.3  pgoyette 1195: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1196: {
1.249     dyoung   1197:        struct rtentry *rt;
                   1198:        union {
                   1199:                struct sockaddr         dst;
                   1200:                struct sockaddr_in      dst4;
                   1201:        } u;
                   1202:
                   1203:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1204:
1.337.2.3  pgoyette 1205:        ro = percpu_getref(ipforward_rt_percpu);
                   1206:        rt = rtcache_lookup(ro, &u.dst);
                   1207:        if (rt == NULL) {
                   1208:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1209:                return NULL;
1.337.2.3  pgoyette 1210:        }
                   1211:
                   1212:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
                   1213:        rtcache_unref(rt, ro);
                   1214:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1215:
                   1216:        return ifatoia(rt->rt_ifa);
1.1       cgd      1217: }
                   1218:
                   1219: /*
1.311     rmind    1220:  * save_rte: save incoming source route for use in replies, to be picked
                   1221:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1222:  */
1.311     rmind    1223: static void
1.337.2.5! pgoyette 1224: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1225: {
1.337.2.5! pgoyette 1226:        struct ip_srcrt *isr;
        !          1227:        struct m_tag *mtag;
1.1       cgd      1228:        unsigned olen;
                   1229:
                   1230:        olen = option[IPOPT_OLEN];
1.337.2.5! pgoyette 1231:        if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
        !          1232:                return;
        !          1233:
        !          1234:        mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
        !          1235:        if (mtag == NULL)
1.1       cgd      1236:                return;
1.337.2.5! pgoyette 1237:        isr = (struct ip_srcrt *)(mtag + 1);
        !          1238:
        !          1239:        memcpy(isr->isr_hdr, option, olen);
        !          1240:        isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
        !          1241:        isr->isr_dst = dst;
        !          1242:        m_tag_prepend(m, mtag);
1.1       cgd      1243: }
                   1244:
                   1245: /*
                   1246:  * Retrieve incoming source route for use in replies,
                   1247:  * in the same form used by setsockopt.
                   1248:  * The first hop is placed before the options, will be removed later.
                   1249:  */
                   1250: struct mbuf *
1.337.2.5! pgoyette 1251: ip_srcroute(struct mbuf *m0)
1.1       cgd      1252: {
1.109     augustss 1253:        struct in_addr *p, *q;
                   1254:        struct mbuf *m;
1.337.2.5! pgoyette 1255:        struct ip_srcrt *isr;
        !          1256:        struct m_tag *mtag;
1.1       cgd      1257:
1.337.2.5! pgoyette 1258:        mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
        !          1259:        if (mtag == NULL)
1.237     dyoung   1260:                return NULL;
1.337.2.5! pgoyette 1261:        isr = (struct ip_srcrt *)(mtag + 1);
        !          1262:
        !          1263:        if (isr->isr_nhops == 0)
        !          1264:                return NULL;
        !          1265:
1.1       cgd      1266:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.337.2.5! pgoyette 1267:        if (m == NULL)
1.237     dyoung   1268:                return NULL;
1.1       cgd      1269:
1.164     matt     1270:        MCLAIM(m, &inetdomain.dom_mowner);
1.337.2.5! pgoyette 1271: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1272:
1.337.2.5! pgoyette 1273:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
        !          1274:        m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1       cgd      1275:
                   1276:        /*
                   1277:         * First save first hop for return route
                   1278:         */
1.337.2.5! pgoyette 1279:        p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1       cgd      1280:        *(mtod(m, struct in_addr *)) = *p--;
                   1281:
                   1282:        /*
                   1283:         * Copy option fields and padding (nop) to mbuf.
                   1284:         */
1.337.2.5! pgoyette 1285:        isr->isr_nop = IPOPT_NOP;
        !          1286:        isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
        !          1287:        memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244     christos 1288:            OPTSIZ);
                   1289:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1290:            sizeof(struct in_addr) + OPTSIZ);
                   1291: #undef OPTSIZ
                   1292:        /*
                   1293:         * Record return path as an IP source route,
                   1294:         * reversing the path (pointers are now aligned).
                   1295:         */
1.337.2.5! pgoyette 1296:        while (p >= isr->isr_routes) {
1.1       cgd      1297:                *q++ = *p--;
                   1298:        }
                   1299:        /*
                   1300:         * Last hop goes to final destination.
                   1301:         */
1.337.2.5! pgoyette 1302:        *q = isr->isr_dst;
        !          1303:        m_tag_delete(m0, mtag);
        !          1304:        return m;
1.1       cgd      1305: }
                   1306:
1.139     matt     1307: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1308:        [PRC_MSGSIZE] = EMSGSIZE,
                   1309:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1310:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1311:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1312:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1313:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1314:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1315:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1316:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1317: };
                   1318:
1.295     dyoung   1319: void
                   1320: ip_fasttimo(void)
                   1321: {
                   1322:        if (ip_drainwanted) {
                   1323:                ip_drain();
                   1324:                ip_drainwanted = 0;
                   1325:        }
                   1326: }
                   1327:
                   1328: void
                   1329: ip_drainstub(void)
                   1330: {
                   1331:        ip_drainwanted = 1;
                   1332: }
                   1333:
1.1       cgd      1334: /*
                   1335:  * Forward a packet.  If some error occurs return the sender
                   1336:  * an icmp packet.  Note we can't always generate a meaningful
                   1337:  * icmp message because icmp doesn't have a large enough repertoire
                   1338:  * of codes and types.
                   1339:  *
                   1340:  * If not forwarding, just drop the packet.  This could be confusing
                   1341:  * if ipforwarding was zero but some routing protocol was advancing
                   1342:  * us as a gateway to somewhere.  However, we must let the routing
                   1343:  * protocol deal with that.
                   1344:  *
                   1345:  * The srcrt parameter indicates whether the packet is being forwarded
                   1346:  * via a source route.
                   1347:  */
1.313     rmind    1348: static void
1.329     ozaki-r  1349: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1350: {
1.109     augustss 1351:        struct ip *ip = mtod(m, struct ip *);
                   1352:        struct rtentry *rt;
1.220     christos 1353:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1354:        struct mbuf *mcopy;
1.13      mycroft  1355:        n_long dest;
1.249     dyoung   1356:        union {
                   1357:                struct sockaddr         dst;
                   1358:                struct sockaddr_in      dst4;
                   1359:        } u;
1.320     ozaki-r  1360:        uint64_t *ips;
1.164     matt     1361:
1.318     rmind    1362:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1363:            "interrupt handler; synchronization assumptions violated");
                   1364:
1.164     matt     1365:        /*
                   1366:         * We are now in the output path.
                   1367:         */
                   1368:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1369:
                   1370:        /*
                   1371:         * Clear any in-bound checksum flags for this packet.
                   1372:         */
                   1373:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1374:
1.13      mycroft  1375:        dest = 0;
1.93      sommerfe 1376:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1377:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1378:                m_freem(m);
                   1379:                return;
                   1380:        }
1.318     rmind    1381:
1.1       cgd      1382:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1383:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1384:                return;
                   1385:        }
                   1386:
1.249     dyoung   1387:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1388:
1.337.2.3  pgoyette 1389:        ro = percpu_getref(ipforward_rt_percpu);
                   1390:        rt = rtcache_lookup(ro, &u.dst);
                   1391:        if (rt == NULL) {
                   1392:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1393:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1394:                return;
1.1       cgd      1395:        }
                   1396:
                   1397:        /*
1.34      mycroft  1398:         * Save at most 68 bytes of the packet in case
1.1       cgd      1399:         * we need to generate an ICMP message to the src.
1.119     itojun   1400:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1401:         */
1.155     itojun   1402:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1403:        if (mcopy)
                   1404:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1405:
1.221     christos 1406:        ip->ip_ttl -= IPTTLDEC;
                   1407:
1.1       cgd      1408:        /*
                   1409:         * If forwarding packet using same interface that it came in on,
                   1410:         * perhaps should send a redirect to sender to shortcut a hop.
                   1411:         * Only send redirect if source is sending directly to us,
                   1412:         * and if packet was not source routed (or has any options).
                   1413:         * Also, don't send redirect if forwarding using a default route
                   1414:         * or a route modified by a redirect.
                   1415:         */
1.329     ozaki-r  1416:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1417:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1418:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1419:            ipsendredirects && !srcrt) {
1.19      mycroft  1420:                if (rt->rt_ifa &&
                   1421:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1422:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1423:                        if (rt->rt_flags & RTF_GATEWAY)
                   1424:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1425:                        else
                   1426:                                dest = ip->ip_dst.s_addr;
                   1427:                        /*
                   1428:                         * Router requirements says to only send host
                   1429:                         * redirects.
                   1430:                         */
                   1431:                        type = ICMP_REDIRECT;
                   1432:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1433:                }
                   1434:        }
1.337.2.3  pgoyette 1435:        rtcache_unref(rt, ro);
1.1       cgd      1436:
1.238     dyoung   1437:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1438:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1439:            NULL, NULL);
1.173     jonathan 1440:
1.320     ozaki-r  1441:        if (error) {
1.266     thorpej  1442:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1443:                goto error;
                   1444:        }
                   1445:
                   1446:        ips = IP_STAT_GETREF();
                   1447:        ips[IP_STAT_FORWARD]++;
                   1448:
                   1449:        if (type) {
                   1450:                ips[IP_STAT_REDIRECTSENT]++;
                   1451:                IP_STAT_PUTREF();
                   1452:                goto redirect;
                   1453:        }
                   1454:
                   1455:        IP_STAT_PUTREF();
                   1456:        if (mcopy) {
1.63      matt     1457: #ifdef GATEWAY
1.320     ozaki-r  1458:                if (mcopy->m_flags & M_CANFASTFWD)
                   1459:                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1460: #endif
1.320     ozaki-r  1461:                m_freem(mcopy);
1.1       cgd      1462:        }
1.320     ozaki-r  1463:
1.337.2.2  pgoyette 1464:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1465:        return;
                   1466:
                   1467: redirect:
                   1468: error:
1.318     rmind    1469:        if (mcopy == NULL) {
1.337.2.2  pgoyette 1470:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1471:                return;
1.318     rmind    1472:        }
1.13      mycroft  1473:
1.1       cgd      1474:        switch (error) {
                   1475:
                   1476:        case 0:                         /* forwarded, but need redirect */
                   1477:                /* type, code set above */
                   1478:                break;
                   1479:
                   1480:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1481:        case EHOSTUNREACH:
                   1482:        case ENETDOWN:
                   1483:        case EHOSTDOWN:
                   1484:        default:
                   1485:                type = ICMP_UNREACH;
                   1486:                code = ICMP_UNREACH_HOST;
                   1487:                break;
                   1488:
                   1489:        case EMSGSIZE:
                   1490:                type = ICMP_UNREACH;
                   1491:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1492:
1.337.2.3  pgoyette 1493:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1494:                        destmtu = rt->rt_ifp->if_mtu;
1.337.2.3  pgoyette 1495:                        rtcache_unref(rt, ro);
                   1496:                }
1.305     rmind    1497: #ifdef IPSEC
1.317     christos 1498:                if (ipsec_used)
                   1499:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1500: #endif
1.266     thorpej  1501:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1502:                break;
                   1503:
                   1504:        case ENOBUFS:
1.143     itojun   1505:                /*
1.311     rmind    1506:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1507:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1508:                 * big problem under DoS attacks or if the underlying
                   1509:                 * interface is rate-limited.
1.143     itojun   1510:                 */
                   1511:                if (mcopy)
                   1512:                        m_freem(mcopy);
1.337.2.2  pgoyette 1513:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1514:                return;
1.1       cgd      1515:        }
1.220     christos 1516:        icmp_error(mcopy, type, code, dest, destmtu);
1.337.2.2  pgoyette 1517:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1518: }
                   1519:
                   1520: void
1.211     perry    1521: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1522:     struct mbuf *m)
1.44      thorpej  1523: {
1.311     rmind    1524:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1525:        ifnet_t *ifp;
1.311     rmind    1526:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1527:        struct psref psref;
1.44      thorpej  1528:
1.329     ozaki-r  1529:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1530:        if (__predict_false(ifp == NULL))
                   1531:                return; /* XXX should report error? */
                   1532:
1.311     rmind    1533:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1534: #ifdef SO_OTIMESTAMP
1.311     rmind    1535:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1536: #endif
                   1537:            ) {
1.44      thorpej  1538:                struct timeval tv;
                   1539:
                   1540:                microtime(&tv);
1.278     christos 1541: #ifdef SO_OTIMESTAMP
1.311     rmind    1542:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1543:                        struct timeval50 tv50;
                   1544:                        timeval_to_timeval50(&tv, &tv50);
                   1545:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1546:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1547:                } else
                   1548: #endif
1.244     christos 1549:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1550:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1551:                if (*mp)
                   1552:                        mp = &(*mp)->m_next;
                   1553:        }
1.311     rmind    1554:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1555:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1556:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1557:                if (*mp)
                   1558:                        mp = &(*mp)->m_next;
                   1559:        }
1.311     rmind    1560:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1561:                struct in_pktinfo ipi;
1.307     christos 1562:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1563:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1564:                *mp = sbcreatecontrol((void *) &ipi,
                   1565:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1566:                if (*mp)
                   1567:                        mp = &(*mp)->m_next;
                   1568:        }
1.311     rmind    1569:        if (inpflags & INP_PKTINFO) {
1.306     christos 1570:                struct in_pktinfo ipi;
1.307     christos 1571:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1572:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1573:                *mp = sbcreatecontrol((void *) &ipi,
                   1574:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1575:                if (*mp)
                   1576:                        mp = &(*mp)->m_next;
                   1577:        }
1.311     rmind    1578:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1579:                struct sockaddr_dl sdl;
                   1580:
1.337     ozaki-r  1581:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1582:                    NULL, 0);
1.251     dyoung   1583:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1584:                if (*mp)
                   1585:                        mp = &(*mp)->m_next;
                   1586:        }
1.311     rmind    1587:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1588:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1589:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1590:                if (*mp)
                   1591:                        mp = &(*mp)->m_next;
                   1592:        }
1.329     ozaki-r  1593:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1594: }
                   1595:
1.189     atatat   1596: /*
1.228     elad     1597:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1598:  */
                   1599: static int
                   1600: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1601: {
                   1602:        int error, tmp;
                   1603:        struct sysctlnode node;
                   1604:
                   1605:        node = *rnode;
                   1606:        tmp = ip_forwsrcrt;
                   1607:        node.sysctl_data = &tmp;
                   1608:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1609:        if (error || newp == NULL)
                   1610:                return (error);
                   1611:
1.280     elad     1612:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1613:            0, NULL, NULL, NULL);
                   1614:        if (error)
                   1615:                return (error);
1.228     elad     1616:
                   1617:        ip_forwsrcrt = tmp;
                   1618:
                   1619:        return (0);
                   1620: }
                   1621:
                   1622: /*
1.189     atatat   1623:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1624:  * range of the new value and tweaks timers if it changes.
                   1625:  */
                   1626: static int
                   1627: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1628: {
1.189     atatat   1629:        int error, tmp;
                   1630:        struct sysctlnode node;
                   1631:
1.337.2.4  pgoyette 1632:        icmp_mtudisc_lock();
                   1633:
1.189     atatat   1634:        node = *rnode;
                   1635:        tmp = ip_mtudisc_timeout;
                   1636:        node.sysctl_data = &tmp;
                   1637:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1638:        if (error || newp == NULL)
1.337.2.4  pgoyette 1639:                goto out;
                   1640:        if (tmp < 0) {
                   1641:                error = EINVAL;
                   1642:                goto out;
                   1643:        }
1.273     matt     1644:
1.189     atatat   1645:        ip_mtudisc_timeout = tmp;
                   1646:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.337.2.4  pgoyette 1647:        error = 0;
                   1648: out:
                   1649:        icmp_mtudisc_unlock();
                   1650:        return error;
1.189     atatat   1651: }
1.54      lukem    1652:
1.266     thorpej  1653: static int
                   1654: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1655: {
                   1656:
1.271     thorpej  1657:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1658: }
1.131     itojun   1659:
1.284     pooka    1660: static void
                   1661: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1662: {
1.197     atatat   1663:        sysctl_createv(clog, 0, NULL, NULL,
                   1664:                       CTLFLAG_PERMANENT,
1.203     atatat   1665:                       CTLTYPE_NODE, "inet",
                   1666:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1667:                       NULL, 0, NULL, 0,
                   1668:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1669:        sysctl_createv(clog, 0, NULL, NULL,
                   1670:                       CTLFLAG_PERMANENT,
1.203     atatat   1671:                       CTLTYPE_NODE, "ip",
                   1672:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1673:                       NULL, 0, NULL, 0,
                   1674:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1675:
1.197     atatat   1676:        sysctl_createv(clog, 0, NULL, NULL,
                   1677:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1678:                       CTLTYPE_INT, "forwarding",
                   1679:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1680:                       NULL, 0, &ipforwarding, 0,
                   1681:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1682:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1683:        sysctl_createv(clog, 0, NULL, NULL,
                   1684:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1685:                       CTLTYPE_INT, "redirect",
                   1686:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1687:                       NULL, 0, &ipsendredirects, 0,
                   1688:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1689:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1690:        sysctl_createv(clog, 0, NULL, NULL,
                   1691:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1692:                       CTLTYPE_INT, "ttl",
                   1693:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1694:                       NULL, 0, &ip_defttl, 0,
                   1695:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1696:                       IPCTL_DEFTTL, CTL_EOL);
                   1697: #ifdef IPCTL_DEFMTU
1.197     atatat   1698:        sysctl_createv(clog, 0, NULL, NULL,
                   1699:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1700:                       CTLTYPE_INT, "mtu",
                   1701:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1702:                       NULL, 0, &ip_mtu, 0,
                   1703:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1704:                       IPCTL_DEFMTU, CTL_EOL);
                   1705: #endif /* IPCTL_DEFMTU */
1.197     atatat   1706:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1707:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1708:                       CTLTYPE_INT, "forwsrcrt",
                   1709:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1710:                                    "datagrams"),
1.228     elad     1711:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1712:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1713:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1716:                       CTLTYPE_INT, "directed-broadcast",
                   1717:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1718:                       NULL, 0, &ip_directedbcast, 0,
                   1719:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1720:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1723:                       CTLTYPE_INT, "allowsrcrt",
                   1724:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1725:                       NULL, 0, &ip_allowsrcrt, 0,
                   1726:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1727:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1728:
1.197     atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1731:                       CTLTYPE_INT, "mtudisc",
                   1732:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1733:                       NULL, 0, &ip_mtudisc, 0,
                   1734:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1735:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1736:        sysctl_createv(clog, 0, NULL, NULL,
                   1737:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1738:                       CTLTYPE_INT, "anonportmin",
                   1739:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1740:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1741:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1742:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1743:        sysctl_createv(clog, 0, NULL, NULL,
                   1744:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1745:                       CTLTYPE_INT, "anonportmax",
                   1746:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1747:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1748:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1749:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1752:                       CTLTYPE_INT, "mtudisctimeout",
                   1753:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1754:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1755:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1756:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1757: #ifndef IPNOPRIVPORTS
1.197     atatat   1758:        sysctl_createv(clog, 0, NULL, NULL,
                   1759:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1760:                       CTLTYPE_INT, "lowportmin",
                   1761:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1762:                                    "to assign"),
1.189     atatat   1763:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1764:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1765:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1766:        sysctl_createv(clog, 0, NULL, NULL,
                   1767:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1768:                       CTLTYPE_INT, "lowportmax",
                   1769:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1770:                                    "to assign"),
1.189     atatat   1771:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1772:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1773:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1774: #endif /* IPNOPRIVPORTS */
                   1775: #if NGRE > 0
1.197     atatat   1776:        sysctl_createv(clog, 0, NULL, NULL,
                   1777:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1778:                       CTLTYPE_INT, "grettl",
                   1779:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1780:                       NULL, 0, &ip_gre_ttl, 0,
                   1781:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1782:                       IPCTL_GRE_TTL, CTL_EOL);
                   1783: #endif /* NGRE */
1.197     atatat   1784:        sysctl_createv(clog, 0, NULL, NULL,
                   1785:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1786:                       CTLTYPE_INT, "checkinterface",
                   1787:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1788:                                    "from RFC1122"),
1.189     atatat   1789:                       NULL, 0, &ip_checkinterface, 0,
                   1790:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1791:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1794:                       CTLTYPE_INT, "random_id",
                   1795:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1796:                       NULL, 0, &ip_do_randomid, 0,
                   1797:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1798:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1799:        sysctl_createv(clog, 0, NULL, NULL,
                   1800:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1801:                       CTLTYPE_INT, "do_loopback_cksum",
                   1802:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1803:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1804:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1805:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1806:        sysctl_createv(clog, 0, NULL, NULL,
                   1807:                       CTLFLAG_PERMANENT,
                   1808:                       CTLTYPE_STRUCT, "stats",
                   1809:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1810:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1811:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1812:                       CTL_EOL);
1.322     joerg    1813: #if NARP
1.321     roy      1814:        sysctl_createv(clog, 0, NULL, NULL,
                   1815:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1816:                       CTLTYPE_INT, "dad_count",
                   1817:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1818:                                    "probes to send"),
                   1819:                       NULL, 0, &ip_dad_count, 0,
                   1820:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1821:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1822: #endif
1.301     christos 1823:
                   1824:        /* anonportalgo RFC6056 subtree */
1.302     christos 1825:        const struct sysctlnode *portalgo_node;
                   1826:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1827:                       CTLFLAG_PERMANENT,
                   1828:                       CTLTYPE_NODE, "anonportalgo",
                   1829:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1830:                       NULL, 0, NULL, 0,
                   1831:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1832:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1833:                       CTLFLAG_PERMANENT,
                   1834:                       CTLTYPE_STRING, "available",
                   1835:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1836:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1837:                       CTL_CREATE, CTL_EOL);
1.302     christos 1838:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1840:                       CTLTYPE_STRING, "selected",
                   1841:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1842:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1843:                       CTL_CREATE, CTL_EOL);
                   1844:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1845:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1846:                       CTLTYPE_STRUCT, "reserve",
                   1847:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1848:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1849:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1850: }
1.266     thorpej  1851:
                   1852: void
                   1853: ip_statinc(u_int stat)
                   1854: {
                   1855:
                   1856:        KASSERT(stat < IP_NSTATS);
                   1857:        IP_STATINC(stat);
                   1858: }

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