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Annotation of src/sys/netinet/ip_input.c, Revision 1.355.2.5

1.355.2.5! martin      1: /*     $NetBSD: ip_input.c,v 1.355.2.4 2018/02/12 18:23:29 snj Exp $   */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
                     32: /*-
                     33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.355.2.5! martin     94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.355.2.4 2018/02/12 18:23:29 snj Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.278     christos   98: #include "opt_compat_netbsd.h"
1.62      matt       99: #include "opt_gateway.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.344     ozaki-r   104: #include "opt_net_mpsafe.h"
1.324     pooka     105: #endif
1.1       cgd       106:
1.325     roy       107: #include "arp.h"
                    108:
1.5       mycroft   109: #include <sys/param.h>
                    110: #include <sys/systm.h>
1.318     rmind     111: #include <sys/cpu.h>
1.5       mycroft   112: #include <sys/mbuf.h>
                    113: #include <sys/domain.h>
                    114: #include <sys/protosw.h>
                    115: #include <sys/socket.h>
1.44      thorpej   116: #include <sys/socketvar.h>
1.5       mycroft   117: #include <sys/errno.h>
                    118: #include <sys/time.h>
                    119: #include <sys/kernel.h>
1.72      thorpej   120: #include <sys/pool.h>
1.28      christos  121: #include <sys/sysctl.h>
1.230     elad      122: #include <sys/kauth.h>
1.1       cgd       123:
1.5       mycroft   124: #include <net/if.h>
1.44      thorpej   125: #include <net/if_dl.h>
1.5       mycroft   126: #include <net/route.h>
1.318     rmind     127: #include <net/pktqueue.h>
1.45      mrg       128: #include <net/pfil.h>
1.1       cgd       129:
1.5       mycroft   130: #include <netinet/in.h>
                    131: #include <netinet/in_systm.h>
                    132: #include <netinet/ip.h>
                    133: #include <netinet/in_pcb.h>
1.215     yamt      134: #include <netinet/in_proto.h>
1.5       mycroft   135: #include <netinet/in_var.h>
                    136: #include <netinet/ip_var.h>
1.266     thorpej   137: #include <netinet/ip_private.h>
1.5       mycroft   138: #include <netinet/ip_icmp.h>
1.89      itojun    139: /* just for gif_ttl */
                    140: #include <netinet/in_gif.h>
                    141: #include "gif.h"
1.144     martin    142: #include <net/if_gre.h>
                    143: #include "gre.h"
1.111     jdolecek  144:
                    145: #ifdef MROUTING
                    146: #include <netinet/ip_mroute.h>
                    147: #endif
1.302     christos  148: #include <netinet/portalgo.h>
1.89      itojun    149:
1.304     christos  150: #ifdef IPSEC
1.173     jonathan  151: #include <netipsec/ipsec.h>
1.305     rmind     152: #endif
1.44      thorpej   153:
1.1       cgd       154: #ifndef        IPFORWARDING
                    155: #ifdef GATEWAY
                    156: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    157: #else /* GATEWAY */
                    158: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    159: #endif /* GATEWAY */
                    160: #endif /* IPFORWARDING */
                    161: #ifndef        IPSENDREDIRECTS
                    162: #define        IPSENDREDIRECTS 1
                    163: #endif
1.26      thorpej   164: #ifndef IPFORWSRCRT
1.355.2.4  snj       165: #define        IPFORWSRCRT     0       /* forward source-routed packets */
1.47      cjs       166: #endif
                    167: #ifndef IPALLOWSRCRT
1.355.2.4  snj       168: #define        IPALLOWSRCRT    0       /* allow source-routed packets */
1.26      thorpej   169: #endif
1.53      kml       170: #ifndef IPMTUDISC
1.153     itojun    171: #define IPMTUDISC      1
1.53      kml       172: #endif
1.60      kml       173: #ifndef IPMTUDISCTIMEOUT
1.61      kml       174: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       175: #endif
1.53      kml       176:
1.278     christos  177: #ifdef COMPAT_50
                    178: #include <compat/sys/time.h>
                    179: #include <compat/sys/socket.h>
                    180: #endif
                    181:
1.27      thorpej   182: /*
                    183:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    184:  * configuration using this option will Just Work.
                    185:  */
                    186: #ifndef IPDIRECTEDBCAST
                    187: #ifdef DIRECTED_BROADCAST
                    188: #define IPDIRECTEDBCAST        1
                    189: #else
                    190: #define        IPDIRECTEDBCAST 0
                    191: #endif /* DIRECTED_BROADCAST */
                    192: #endif /* IPDIRECTEDBCAST */
1.1       cgd       193: int    ipforwarding = IPFORWARDING;
                    194: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   195: int    ip_defttl = IPDEFTTL;
1.26      thorpej   196: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   197: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       198: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       199: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    200: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       201: #ifdef DIAGNOSTIC
                    202: int    ipprintfs = 0;
                    203: #endif
1.184     jonathan  204:
                    205: int    ip_do_randomid = 0;
                    206:
1.165     christos  207: /*
                    208:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    209:  * the Strong ES model described in RFC 1122, but since the routing table
                    210:  * and transmit implementation do not implement the Strong ES model,
                    211:  * setting this to 1 results in an odd hybrid.
                    212:  *
                    213:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    214:  * to translate the destination address to another local interface.
                    215:  *
                    216:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    217:  * to the loopback interface instead of the interface where the
                    218:  * packets for those addresses are received.
                    219:  */
1.318     rmind     220: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  221:
1.60      kml       222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    223:
1.318     rmind     224: pktqueue_t *           ip_pktq                 __read_mostly;
                    225: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    226: ipid_state_t *         ip_ids                  __read_mostly;
                    227: percpu_t *             ipstat_percpu           __read_mostly;
                    228:
1.340     ozaki-r   229: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       230:
1.183     jonathan  231: uint16_t ip_id;
1.75      thorpej   232:
1.135     thorpej   233: #ifdef INET_CSUM_COUNTERS
                    234: #include <sys/device.h>
                    235:
                    236: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    237:     NULL, "inet", "hwcsum bad");
                    238: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    239:     NULL, "inet", "hwcsum ok");
                    240: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    241:     NULL, "inet", "swcsum");
                    242:
                    243: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    244:
1.201     matt      245: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    246: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    247: EVCNT_ATTACH_STATIC(ip_swcsum);
                    248:
1.135     thorpej   249: #else
                    250:
                    251: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    252:
                    253: #endif /* INET_CSUM_COUNTERS */
                    254:
1.1       cgd       255: /*
1.354     ozaki-r   256:  * Used to save the IP options in case a protocol wants to respond
1.1       cgd       257:  * to an incoming packet over the same route if the packet got here
                    258:  * using IP source routing.  This allows connection establishment and
                    259:  * maintenance when the remote end is on a network that is not known
                    260:  * to us.
                    261:  */
1.354     ozaki-r   262: struct ip_srcrt {
                    263:        int             isr_nhops;                 /* number of hops */
                    264:        struct in_addr  isr_dst;                   /* final destination */
                    265:        char            isr_nop;                   /* one NOP to align */
                    266:        char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
                    267:        struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    268: };
1.1       cgd       269:
1.295     dyoung    270: static int ip_drainwanted;
                    271:
1.354     ozaki-r   272: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35      mycroft   273:
1.164     matt      274: #ifdef MBUFTRACE
1.234     dogcow    275: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    276: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      277: #endif
                    278:
1.318     rmind     279: static void            ipintr(void *);
1.312     rmind     280: static void            ip_input(struct mbuf *);
1.329     ozaki-r   281: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     282: static bool            ip_dooptions(struct mbuf *);
1.346     ozaki-r   283: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     284: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     285:
1.333     ozaki-r   286: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    287:                            int *);
                    288: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    289:                            struct ip *);
                    290:
1.344     ozaki-r   291: #ifdef NET_MPSAFE
                    292: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    293: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    294: #else
1.318     rmind     295: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    296: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.344     ozaki-r   297: #endif
1.318     rmind     298:
1.1       cgd       299: /*
                    300:  * IP initialization: fill in IP protocol switch table.
                    301:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    302:  */
1.8       mycroft   303: void
1.211     perry     304: ip_init(void)
1.1       cgd       305: {
1.199     matt      306:        const struct protosw *pr;
1.1       cgd       307:
1.311     rmind     308:        in_init();
1.284     pooka     309:        sysctl_net_inet_ip_setup(NULL);
                    310:
1.311     rmind     311:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    312:        KASSERT(pr != NULL);
1.275     pooka     313:
1.319     ozaki-r   314:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     315:        KASSERT(ip_pktq != NULL);
                    316:
1.328     riastrad  317:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    318:                ip_protox[i] = pr - inetsw;
1.311     rmind     319:        }
1.328     riastrad  320:        for (pr = inetdomain.dom_protosw;
                    321:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       322:                if (pr->pr_domain->dom_family == PF_INET &&
                    323:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  324:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  325:
1.288     rmind     326:        ip_reass_init();
1.190     jonathan  327:
1.291     rmind     328:        ip_ids = ip_id_init();
1.323     ozaki-r   329:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  330:
1.73      thorpej   331: #ifdef GATEWAY
1.311     rmind     332:        ipflow_init();
1.73      thorpej   333: #endif
1.121     thorpej   334:
                    335:        /* Register our Packet Filter hook. */
1.308     rmind     336:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    337:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   338:
1.164     matt      339: #ifdef MBUFTRACE
                    340:        MOWNER_ATTACH(&ip_tx_mowner);
                    341:        MOWNER_ATTACH(&ip_rx_mowner);
                    342: #endif /* MBUFTRACE */
1.266     thorpej   343:
                    344:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340     ozaki-r   345:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
1.352     ozaki-r   346:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       347: }
                    348:
1.333     ozaki-r   349: static struct in_ifaddr *
                    350: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    351: {
                    352:        struct in_ifaddr *ia = NULL;
                    353:        int checkif;
                    354:
                    355:        /*
                    356:         * Enable a consistency check between the destination address
                    357:         * and the arrival interface for a unicast packet (the RFC 1122
                    358:         * strong ES model) if IP forwarding is disabled and the packet
                    359:         * is not locally generated.
                    360:         *
                    361:         * XXX - Checking also should be disabled if the destination
                    362:         * address is ipnat'ed to a different interface.
                    363:         *
                    364:         * XXX - Checking is incompatible with IP aliases added
                    365:         * to the loopback interface instead of the interface where
                    366:         * the packets are received.
                    367:         *
                    368:         * XXX - We need to add a per ifaddr flag for this so that
                    369:         * we get finer grain control.
                    370:         */
                    371:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    372:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    373:
1.334     ozaki-r   374:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   375:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    376:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    377:                                continue;
                    378:                        if (checkif && ia->ia_ifp != ifp)
                    379:                                continue;
1.355.2.2  snj       380:                        if ((ia->ia_ifp->if_flags & IFF_UP) == 0) {
1.338     ozaki-r   381:                                (*downmatch)++;
1.355.2.2  snj       382:                                continue;
                    383:                        }
                    384:                        if (ia->ia4_flags & IN_IFF_DETACHED &&
                    385:                            (ifp->if_flags & IFF_LOOPBACK) == 0)
                    386:                                continue;
                    387:                        break;
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);
1.355.2.2  snj       404:                if (ia->ia4_flags & IN_IFF_NOTREADY)
                    405:                        continue;
                    406:                if (ia->ia4_flags & IN_IFF_DETACHED &&
                    407:                    (ifp->if_flags & IFF_LOOPBACK) == 0)
1.333     ozaki-r   408:                        continue;
                    409:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    410:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    411:                    /*
                    412:                     * Look for all-0's host part (old broadcast addr),
                    413:                     * either for subnet or net.
                    414:                     */
                    415:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    416:                    ip->ip_dst.s_addr == ia->ia_net)
                    417:                        goto matched;
                    418:                /*
                    419:                 * An interface with IP address zero accepts
                    420:                 * all packets that arrive on that interface.
                    421:                 */
                    422:                if (in_nullhost(ia->ia_addr.sin_addr))
                    423:                        goto matched;
                    424:        }
                    425:        ia = NULL;
                    426:
                    427: matched:
                    428:        return ia;
                    429: }
                    430:
1.1       cgd       431: /*
1.318     rmind     432:  * IP software interrupt routine.
1.89      itojun    433:  */
1.318     rmind     434: static void
                    435: ipintr(void *arg __unused)
1.89      itojun    436: {
                    437:        struct mbuf *m;
1.286     tls       438:
1.318     rmind     439:        KASSERT(cpu_softintr_p());
1.89      itojun    440:
1.355.2.5! martin    441:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.318     rmind     442:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    443:                ip_input(m);
                    444:        }
1.355.2.5! martin    445:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.89      itojun    446: }
                    447:
                    448: /*
1.318     rmind     449:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       450:  * try to reassemble.  Process options.  Pass to next level.
                    451:  */
1.312     rmind     452: static void
1.89      itojun    453: ip_input(struct mbuf *m)
1.1       cgd       454: {
1.109     augustss  455:        struct ip *ip = NULL;
1.339     ozaki-r   456:        struct in_ifaddr *ia = NULL;
1.288     rmind     457:        int hlen = 0, len;
1.100     itojun    458:        int downmatch;
1.169     itojun    459:        int srcrt = 0;
1.314     rmind     460:        ifnet_t *ifp;
1.329     ozaki-r   461:        struct psref psref;
1.339     ozaki-r   462:        int s;
1.1       cgd       463:
1.318     rmind     464:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    465:            "interrupt handler; synchronization assumptions violated");
                    466:
1.164     matt      467:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     468:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   469:
                    470:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   471:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   472:                goto out;
1.164     matt      473:
1.1       cgd       474:        /*
                    475:         * If no IP addresses have been set yet but the interfaces
                    476:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     477:         * Note: we pre-check without locks held.
1.1       cgd       478:         */
1.335     ozaki-r   479:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   480:                goto out;
1.266     thorpej   481:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     482:
1.154     thorpej   483:        /*
                    484:         * If the IP header is not aligned, slurp it up into a new
                    485:         * mbuf with space for link headers, in the event we forward
                    486:         * it.  Otherwise, if it is aligned, make sure the entire
                    487:         * base IP header is in the first mbuf of the chain.
                    488:         */
1.244     christos  489:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   490:                if ((m = m_copyup(m, sizeof(struct ip),
                    491:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    492:                        /* XXXJRT new stat, please */
1.266     thorpej   493:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   494:                        goto out;
1.154     thorpej   495:                }
                    496:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    497:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   498:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   499:                        goto out;
1.154     thorpej   500:                }
1.1       cgd       501:        }
                    502:        ip = mtod(m, struct ip *);
1.13      mycroft   503:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   504:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   505:                goto out;
1.13      mycroft   506:        }
1.1       cgd       507:        hlen = ip->ip_hl << 2;
                    508:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   509:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   510:                goto out;
1.1       cgd       511:        }
                    512:        if (hlen > m->m_len) {
1.298     liamjfoy  513:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   514:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   515:                        goto out;
1.1       cgd       516:                }
                    517:                ip = mtod(m, struct ip *);
                    518:        }
1.98      thorpej   519:
1.85      hwr       520:        /*
1.99      thorpej   521:         * RFC1122: packets with a multicast source address are
1.98      thorpej   522:         * not allowed.
1.85      hwr       523:         */
                    524:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   525:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   526:                goto out;
1.129     itojun    527:        }
                    528:
                    529:        /* 127/8 must not appear on wire - RFC1122 */
                    530:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    531:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     532:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   533:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   534:                        goto out;
1.130     itojun    535:                }
1.85      hwr       536:        }
                    537:
1.135     thorpej   538:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     539:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   540:                 M_CSUM_IPv4_BAD)) {
                    541:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    542:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   543:                IP_STATINC(IP_STAT_BADSUM);
                    544:                goto out;
1.135     thorpej   545:
                    546:        case M_CSUM_IPv4:
                    547:                /* Checksum was okay. */
                    548:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    549:                break;
                    550:
                    551:        default:
1.206     thorpej   552:                /*
                    553:                 * Must compute it ourselves.  Maybe skip checksum on
                    554:                 * loopback interfaces.
                    555:                 */
1.314     rmind     556:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    557:                    ip_do_loopback_cksum)) {
1.206     thorpej   558:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   559:                        if (in_cksum(m, hlen) != 0) {
                    560:                                IP_STATINC(IP_STAT_BADSUM);
                    561:                                goto out;
                    562:                        }
1.206     thorpej   563:                }
1.135     thorpej   564:                break;
1.1       cgd       565:        }
                    566:
1.121     thorpej   567:        /* Retrieve the packet length. */
                    568:        len = ntohs(ip->ip_len);
1.81      proff     569:
                    570:        /*
                    571:         * Check for additional length bogosity
                    572:         */
1.84      proff     573:        if (len < hlen) {
1.266     thorpej   574:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   575:                goto out;
1.81      proff     576:        }
1.1       cgd       577:
                    578:        /*
                    579:         * Check that the amount of data in the buffers
                    580:         * is as at least much as the IP header would have us expect.
                    581:         * Trim mbufs if longer than we expect.
                    582:         * Drop packet if shorter than we expect.
                    583:         */
1.35      mycroft   584:        if (m->m_pkthdr.len < len) {
1.266     thorpej   585:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   586:                goto out;
1.1       cgd       587:        }
1.35      mycroft   588:        if (m->m_pkthdr.len > len) {
1.1       cgd       589:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   590:                        m->m_len = len;
                    591:                        m->m_pkthdr.len = len;
1.1       cgd       592:                } else
1.35      mycroft   593:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       594:        }
                    595:
1.64      thorpej   596:        /*
                    597:         * Assume that we can create a fast-forward IP flow entry
                    598:         * based on this packet.
                    599:         */
                    600:        m->m_flags |= M_CANFASTFWD;
                    601:
1.33      mrg       602:        /*
1.64      thorpej   603:         * Run through list of hooks for input packets.  If there are any
                    604:         * filters which require that additional packets in the flow are
                    605:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    606:         * Note that filters must _never_ set this flag, as another filter
                    607:         * in the list may have previously cleared it.
1.33      mrg       608:         */
1.304     christos  609: #if defined(IPSEC)
1.317     christos  610:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    611: #else
                    612:        if (1)
                    613: #endif
                    614:        {
1.314     rmind     615:                struct in_addr odst = ip->ip_dst;
1.318     rmind     616:                bool freed;
1.169     itojun    617:
1.318     rmind     618:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    619:                if (freed || m == NULL) {
1.343     ozaki-r   620:                        m = NULL;
1.329     ozaki-r   621:                        goto out;
1.318     rmind     622:                }
1.127     itojun    623:                ip = mtod(m, struct ip *);
1.142     darrenr   624:                hlen = ip->ip_hl << 2;
1.318     rmind     625:
1.205     darrenr   626:                /*
                    627:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    628:                 * from generating ICMP redirects for packets that have
                    629:                 * been redirected by a hook back out on to the same LAN that
                    630:                 * they came from and is not an indication that the packet
                    631:                 * is being inffluenced by source routing options.  This
                    632:                 * allows things like
                    633:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    634:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    635:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    636:                 * also requires a "map tlp0 ..." to complete the story.
                    637:                 * One might argue whether or not this kind of network config.
1.212     perry     638:                 * should be supported in this manner...
1.205     darrenr   639:                 */
1.169     itojun    640:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    641:        }
1.123     thorpej   642:
                    643: #ifdef ALTQ
                    644:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     645:        if (altq_input) {
                    646:                SOFTNET_LOCK();
                    647:                if ((*altq_input)(m, AF_INET) == 0) {
                    648:                        /* Packet dropped by traffic conditioner. */
                    649:                        SOFTNET_UNLOCK();
1.343     ozaki-r   650:                        m = NULL;
1.329     ozaki-r   651:                        goto out;
1.318     rmind     652:                }
                    653:                SOFTNET_UNLOCK();
1.123     thorpej   654:        }
                    655: #endif
1.121     thorpej   656:
                    657:        /*
1.1       cgd       658:         * Process options and, if not destined for us,
                    659:         * ship it on.  ip_dooptions returns 1 when an
                    660:         * error was detected (causing an icmp message
                    661:         * to be sent and the original packet to be freed).
                    662:         */
1.343     ozaki-r   663:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    664:                m = NULL;
1.329     ozaki-r   665:                goto out;
1.343     ozaki-r   666:        }
1.1       cgd       667:
                    668:        /*
                    669:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    670:         *
                    671:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    672:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       673:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       674:         */
1.100     itojun    675:        downmatch = 0;
1.339     ozaki-r   676:        s = pserialize_read_enter();
1.333     ozaki-r   677:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   678:        if (ia != NULL) {
                    679:                pserialize_read_exit(s);
1.86      thorpej   680:                goto ours;
1.339     ozaki-r   681:        }
1.333     ozaki-r   682:
1.315     christos  683:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   684:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   685:                if (ia != NULL) {
                    686:                        pserialize_read_exit(s);
1.333     ozaki-r   687:                        goto ours;
1.339     ozaki-r   688:                }
1.1       cgd       689:        }
1.339     ozaki-r   690:        pserialize_read_exit(s);
1.333     ozaki-r   691:
1.18      mycroft   692:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   693: #ifdef MROUTING
                    694:                extern struct socket *ip_mrouter;
1.10      brezak    695:
1.4       hpeyerl   696:                if (ip_mrouter) {
                    697:                        /*
                    698:                         * If we are acting as a multicast router, all
                    699:                         * incoming multicast packets are passed to the
                    700:                         * kernel-level multicast forwarding function.
                    701:                         * The packet is returned (relatively) intact; if
                    702:                         * ip_mforward() returns a non-zero value, the packet
                    703:                         * must be discarded, else it may be accepted below.
                    704:                         *
                    705:                         * (The IP ident field is put in the same byte order
                    706:                         * as expected when ip_mforward() is called from
                    707:                         * ip_output().)
                    708:                         */
1.318     rmind     709:                        SOFTNET_LOCK();
1.314     rmind     710:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     711:                                SOFTNET_UNLOCK();
1.266     thorpej   712:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   713:                                goto out;
1.4       hpeyerl   714:                        }
1.318     rmind     715:                        SOFTNET_UNLOCK();
1.4       hpeyerl   716:
                    717:                        /*
                    718:                         * The process-level routing demon needs to receive
                    719:                         * all multicast IGMP packets, whether or not this
                    720:                         * host belongs to their destination groups.
                    721:                         */
1.318     rmind     722:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   723:                                goto ours;
1.318     rmind     724:                        }
1.266     thorpej   725:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   726:                }
                    727: #endif
                    728:                /*
                    729:                 * See if we belong to the destination multicast group on the
                    730:                 * arrival interface.
                    731:                 */
1.316     rmind     732:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   733:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   734:                        goto out;
1.4       hpeyerl   735:                }
                    736:                goto ours;
                    737:        }
1.19      mycroft   738:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   739:            in_nullhost(ip->ip_dst))
1.1       cgd       740:                goto ours;
                    741:
                    742:        /*
                    743:         * Not for us; forward if possible and desirable.
                    744:         */
                    745:        if (ipforwarding == 0) {
1.329     ozaki-r   746:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   747:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       748:                m_freem(m);
1.100     itojun    749:        } else {
                    750:                /*
                    751:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    752:                 * and there's no IFF_UP interface that matches ip_dst,
                    753:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    754:                 * forwarding loop till TTL goes to 0.
                    755:                 */
                    756:                if (downmatch) {
1.329     ozaki-r   757:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    758:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   759:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    760:                        return;
                    761:                }
1.304     christos  762: #ifdef IPSEC
1.355.2.1  snj       763:                /* Check the security policy (SP) for the packet */
1.318     rmind     764:                if (ipsec_used) {
                    765:                        if (ipsec4_input(m, IP_FORWARDING |
                    766:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
1.332     ozaki-r   767:                                goto out;
1.318     rmind     768:                        }
1.173     jonathan  769:                }
1.305     rmind     770: #endif
1.329     ozaki-r   771:                ip_forward(m, srcrt, ifp);
                    772:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    773:        }
1.89      itojun    774:        return;
1.1       cgd       775:
                    776: ours:
1.329     ozaki-r   777:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   778:        ifp = NULL;
1.329     ozaki-r   779:
1.1       cgd       780:        /*
                    781:         * If offset or IP_MF are set, must reassemble.
                    782:         */
1.155     itojun    783:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     784:                /*
                    785:                 * Pass to IP reassembly mechanism.
                    786:                 */
1.290     rmind     787:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     788:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   789:                        goto out;
1.16      cgd       790:                }
1.290     rmind     791:                if (m == NULL) {
1.289     rmind     792:                        /* More fragments should come; silently return. */
1.332     ozaki-r   793:                        goto out;
1.289     rmind     794:                }
1.290     rmind     795:                /*
                    796:                 * Reassembly is done, we have the final packet.
                    797:                 * Updated cached data in local variable(s).
                    798:                 */
1.289     rmind     799:                ip = mtod(m, struct ip *);
                    800:                hlen = ip->ip_hl << 2;
1.79      mycroft   801:        }
1.128     itojun    802:
1.304     christos  803: #ifdef IPSEC
1.173     jonathan  804:        /*
1.305     rmind     805:         * Enforce IPsec policy checking if we are seeing last header.
                    806:         * Note that we do not visit this with protocols with PCB layer
                    807:         * code - like UDP/TCP/raw IP.
1.173     jonathan  808:         */
1.317     christos  809:        if (ipsec_used &&
1.328     riastrad  810:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.305     rmind     811:                if (ipsec4_input(m, 0) != 0) {
1.332     ozaki-r   812:                        goto out;
1.173     jonathan  813:                }
                    814:        }
1.305     rmind     815: #endif
1.1       cgd       816:
                    817:        /*
                    818:         * Switch out to protocol's input routine.
                    819:         */
1.82      aidan     820: #if IFA_STATS
1.339     ozaki-r   821:        if (ia && ip) {
                    822:                struct in_ifaddr *_ia;
                    823:                /*
                    824:                 * Keep a reference from ip_match_our_address with psref
                    825:                 * is expensive, so explore ia here again.
                    826:                 */
                    827:                s = pserialize_read_enter();
1.342     ozaki-r   828:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   829:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    830:                pserialize_read_exit(s);
                    831:        }
1.82      aidan     832: #endif
1.266     thorpej   833:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    834:
1.318     rmind     835:        const int off = hlen, nh = ip->ip_p;
                    836:
1.328     riastrad  837:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.89      itojun    838:        return;
1.135     thorpej   839:
1.329     ozaki-r   840: out:
                    841:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   842:        if (m != NULL)
                    843:                m_freem(m);
1.1       cgd       844: }
                    845:
                    846: /*
1.288     rmind     847:  * IP timer processing.
1.1       cgd       848:  */
1.8       mycroft   849: void
1.211     perry     850: ip_slowtimo(void)
1.1       cgd       851: {
1.268     ad        852:
1.355.2.3  snj       853:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.1       cgd       854:
1.288     rmind     855:        ip_reass_slowtimo();
1.268     ad        856:
1.355.2.3  snj       857:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.1       cgd       858: }
                    859:
                    860: /*
1.288     rmind     861:  * IP drain processing.
1.1       cgd       862:  */
1.8       mycroft   863: void
1.211     perry     864: ip_drain(void)
1.1       cgd       865: {
                    866:
1.268     ad        867:        KERNEL_LOCK(1, NULL);
1.288     rmind     868:        ip_reass_drain();
1.268     ad        869:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       870: }
                    871:
                    872: /*
1.311     rmind     873:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    874:  * it if bad options are encountered, or forwarding it if source-routed.
                    875:  *
                    876:  * => Returns true if packet has been forwarded/freed.
                    877:  * => Returns false if the packet should be processed further.
1.1       cgd       878:  */
1.311     rmind     879: static bool
1.211     perry     880: ip_dooptions(struct mbuf *m)
1.1       cgd       881: {
1.109     augustss  882:        struct ip *ip = mtod(m, struct ip *);
                    883:        u_char *cp, *cp0;
                    884:        struct ip_timestamp *ipt;
                    885:        struct in_ifaddr *ia;
1.1       cgd       886:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   887:        struct in_addr dst;
1.1       cgd       888:        n_time ntime;
1.349     ozaki-r   889:        struct ifaddr *ifa = NULL;
1.339     ozaki-r   890:        int s;
1.1       cgd       891:
1.13      mycroft   892:        dst = ip->ip_dst;
1.1       cgd       893:        cp = (u_char *)(ip + 1);
                    894:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    895:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    896:                opt = cp[IPOPT_OPTVAL];
                    897:                if (opt == IPOPT_EOL)
                    898:                        break;
                    899:                if (opt == IPOPT_NOP)
                    900:                        optlen = 1;
                    901:                else {
1.113     itojun    902:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    903:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    904:                                goto bad;
                    905:                        }
1.1       cgd       906:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    907:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       908:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    909:                                goto bad;
                    910:                        }
                    911:                }
                    912:                switch (opt) {
                    913:
                    914:                default:
                    915:                        break;
                    916:
                    917:                /*
                    918:                 * Source routing with record.
                    919:                 * Find interface with current destination address.
                    920:                 * If none on this machine then drop if strictly routed,
                    921:                 * or do nothing if loosely routed.
                    922:                 * Record interface address and bring up next address
                    923:                 * component.  If strictly routed make sure next
                    924:                 * address is on directly accessible net.
                    925:                 */
                    926:                case IPOPT_LSRR:
1.346     ozaki-r   927:                case IPOPT_SSRR: {
                    928:                        struct psref psref;
1.353     ozaki-r   929:                        struct sockaddr_in ipaddr = {
                    930:                            .sin_len = sizeof(ipaddr),
                    931:                            .sin_family = AF_INET,
                    932:                        };
                    933:
1.47      cjs       934:                        if (ip_allowsrcrt == 0) {
                    935:                                type = ICMP_UNREACH;
                    936:                                code = ICMP_UNREACH_NET_PROHIB;
                    937:                                goto bad;
                    938:                        }
1.114     itojun    939:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    940:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    941:                                goto bad;
                    942:                        }
1.1       cgd       943:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    944:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    945:                                goto bad;
                    946:                        }
                    947:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   948:
                    949:                        s = pserialize_read_enter();
                    950:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    951:                        if (ifa == NULL) {
                    952:                                pserialize_read_exit(s);
1.1       cgd       953:                                if (opt == IPOPT_SSRR) {
                    954:                                        type = ICMP_UNREACH;
                    955:                                        code = ICMP_UNREACH_SRCFAIL;
                    956:                                        goto bad;
                    957:                                }
                    958:                                /*
                    959:                                 * Loose routing, and not at next destination
                    960:                                 * yet; nothing to do except forward.
                    961:                                 */
                    962:                                break;
                    963:                        }
1.339     ozaki-r   964:                        pserialize_read_exit(s);
                    965:
1.1       cgd       966:                        off--;                  /* 0 origin */
1.112     sommerfe  967:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       968:                                /*
                    969:                                 * End of source route.  Should be for us.
                    970:                                 */
1.354     ozaki-r   971:                                save_rte(m, cp, ip->ip_src);
1.1       cgd       972:                                break;
                    973:                        }
                    974:                        /*
                    975:                         * locate outgoing interface
                    976:                         */
1.281     tsutsui   977:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       978:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   979:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   980:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    981:                                    &psref);
1.339     ozaki-r   982:                                if (ifa != NULL)
                    983:                                        ia = ifatoia(ifa);
                    984:                                else
                    985:                                        ia = NULL;
                    986:                        } else {
1.346     ozaki-r   987:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r   988:                        }
                    989:                        if (ia == NULL) {
1.1       cgd       990:                                type = ICMP_UNREACH;
                    991:                                code = ICMP_UNREACH_SRCFAIL;
                    992:                                goto bad;
                    993:                        }
                    994:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos  995:                        bcopy((void *)&ia->ia_addr.sin_addr,
                    996:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r   997:                        ia4_release(ia, &psref);
1.1       cgd       998:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   999:                        /*
                   1000:                         * Let ip_intr's mcast routing check handle mcast pkts
                   1001:                         */
1.18      mycroft  1002:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd      1003:                        break;
1.346     ozaki-r  1004:                    }
1.1       cgd      1005:
1.346     ozaki-r  1006:                case IPOPT_RR: {
                   1007:                        struct psref psref;
1.353     ozaki-r  1008:                        struct sockaddr_in ipaddr = {
                   1009:                            .sin_len = sizeof(ipaddr),
                   1010:                            .sin_family = AF_INET,
                   1011:                        };
                   1012:
1.114     itojun   1013:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                   1014:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                   1015:                                goto bad;
                   1016:                        }
1.1       cgd      1017:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                   1018:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                   1019:                                goto bad;
                   1020:                        }
                   1021:                        /*
                   1022:                         * If no space remains, ignore.
                   1023:                         */
                   1024:                        off--;                  /* 0 origin */
1.112     sommerfe 1025:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1026:                                break;
1.281     tsutsui  1027:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd      1028:                            sizeof(ipaddr.sin_addr));
                   1029:                        /*
                   1030:                         * locate outgoing interface; if we're the destination,
                   1031:                         * use the incoming interface (should be same).
                   1032:                         */
1.346     ozaki-r  1033:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1034:                        if (ifa == NULL) {
1.346     ozaki-r  1035:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1036:                                if (ia == NULL) {
                   1037:                                        type = ICMP_UNREACH;
                   1038:                                        code = ICMP_UNREACH_HOST;
                   1039:                                        goto bad;
                   1040:                                }
                   1041:                        } else {
                   1042:                                ia = ifatoia(ifa);
1.1       cgd      1043:                        }
1.244     christos 1044:                        bcopy((void *)&ia->ia_addr.sin_addr,
                   1045:                            (void *)(cp + off), sizeof(struct in_addr));
1.346     ozaki-r  1046:                        ia4_release(ia, &psref);
1.1       cgd      1047:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1048:                        break;
1.346     ozaki-r  1049:                    }
1.1       cgd      1050:
                   1051:                case IPOPT_TS:
                   1052:                        code = cp - (u_char *)ip;
                   1053:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun   1054:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1055:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1056:                                goto bad;
1.114     itojun   1057:                        }
                   1058:                        if (ipt->ipt_ptr < 5) {
                   1059:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1060:                                goto bad;
                   1061:                        }
1.15      cgd      1062:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun   1063:                                if (++ipt->ipt_oflw == 0) {
                   1064:                                        code = (u_char *)&ipt->ipt_ptr -
                   1065:                                            (u_char *)ip;
1.1       cgd      1066:                                        goto bad;
1.114     itojun   1067:                                }
1.1       cgd      1068:                                break;
                   1069:                        }
1.104     thorpej  1070:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1071:                        switch (ipt->ipt_flg) {
                   1072:
                   1073:                        case IPOPT_TS_TSONLY:
                   1074:                                break;
                   1075:
1.329     ozaki-r  1076:                        case IPOPT_TS_TSANDADDR: {
                   1077:                                struct ifnet *rcvif;
1.339     ozaki-r  1078:                                int _s, _ss;
1.353     ozaki-r  1079:                                struct sockaddr_in ipaddr = {
                   1080:                                    .sin_len = sizeof(ipaddr),
                   1081:                                    .sin_family = AF_INET,
                   1082:                                };
1.329     ozaki-r  1083:
1.66      thorpej  1084:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1085:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1086:                                        code = (u_char *)&ipt->ipt_ptr -
                   1087:                                            (u_char *)ip;
1.1       cgd      1088:                                        goto bad;
1.114     itojun   1089:                                }
1.13      mycroft  1090:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1091:                                _ss = pserialize_read_enter();
                   1092:                                rcvif = m_get_rcvif(m, &_s);
1.349     ozaki-r  1093:                                if (__predict_true(rcvif != NULL)) {
                   1094:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1095:                                            rcvif);
                   1096:                                }
1.339     ozaki-r  1097:                                m_put_rcvif(rcvif, &_s);
                   1098:                                if (ifa == NULL) {
                   1099:                                        pserialize_read_exit(_ss);
                   1100:                                        break;
                   1101:                                }
                   1102:                                ia = ifatoia(ifa);
1.104     thorpej  1103:                                bcopy(&ia->ia_addr.sin_addr,
                   1104:                                    cp0, sizeof(struct in_addr));
1.339     ozaki-r  1105:                                pserialize_read_exit(_ss);
1.1       cgd      1106:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1107:                                break;
1.329     ozaki-r  1108:                        }
1.1       cgd      1109:
1.353     ozaki-r  1110:                        case IPOPT_TS_PRESPEC: {
                   1111:                                struct sockaddr_in ipaddr = {
                   1112:                                    .sin_len = sizeof(ipaddr),
                   1113:                                    .sin_family = AF_INET,
                   1114:                                };
                   1115:
1.66      thorpej  1116:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1117:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1118:                                        code = (u_char *)&ipt->ipt_ptr -
                   1119:                                            (u_char *)ip;
1.1       cgd      1120:                                        goto bad;
1.114     itojun   1121:                                }
1.281     tsutsui  1122:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1123:                                    sizeof(struct in_addr));
1.339     ozaki-r  1124:                                s = pserialize_read_enter();
                   1125:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1126:                                if (ifa == NULL) {
                   1127:                                        pserialize_read_exit(s);
1.1       cgd      1128:                                        continue;
1.339     ozaki-r  1129:                                }
                   1130:                                pserialize_read_exit(s);
1.1       cgd      1131:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1132:                                break;
1.353     ozaki-r  1133:                            }
1.1       cgd      1134:
                   1135:                        default:
1.114     itojun   1136:                                /* XXX can't take &ipt->ipt_flg */
                   1137:                                code = (u_char *)&ipt->ipt_ptr -
                   1138:                                    (u_char *)ip + 1;
1.1       cgd      1139:                                goto bad;
                   1140:                        }
                   1141:                        ntime = iptime();
1.107     thorpej  1142:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1143:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1144:                            sizeof(n_time));
                   1145:                        ipt->ipt_ptr += sizeof(n_time);
                   1146:                }
                   1147:        }
                   1148:        if (forward) {
1.329     ozaki-r  1149:                struct ifnet *rcvif;
1.339     ozaki-r  1150:                struct psref _psref;
1.329     ozaki-r  1151:
1.26      thorpej  1152:                if (ip_forwsrcrt == 0) {
                   1153:                        type = ICMP_UNREACH;
                   1154:                        code = ICMP_UNREACH_SRCFAIL;
                   1155:                        goto bad;
                   1156:                }
1.329     ozaki-r  1157:
1.339     ozaki-r  1158:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1159:                if (__predict_false(rcvif == NULL)) {
                   1160:                        type = ICMP_UNREACH;
                   1161:                        code = ICMP_UNREACH_HOST;
                   1162:                        goto bad;
                   1163:                }
1.329     ozaki-r  1164:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1165:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1166:                return true;
1.13      mycroft  1167:        }
1.311     rmind    1168:        return false;
1.1       cgd      1169: bad:
1.13      mycroft  1170:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1171:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1172:        return true;
1.1       cgd      1173: }
                   1174:
                   1175: /*
1.311     rmind    1176:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1177:  * return internet address info of interface to be used to get there.
                   1178:  */
1.311     rmind    1179: static struct in_ifaddr *
1.346     ozaki-r  1180: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1181: {
1.249     dyoung   1182:        struct rtentry *rt;
                   1183:        union {
                   1184:                struct sockaddr         dst;
                   1185:                struct sockaddr_in      dst4;
                   1186:        } u;
1.340     ozaki-r  1187:        struct route *ro;
1.249     dyoung   1188:
                   1189:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1190:
1.340     ozaki-r  1191:        ro = percpu_getref(ipforward_rt_percpu);
                   1192:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1193:        if (rt == NULL) {
                   1194:                percpu_putref(ipforward_rt_percpu);
                   1195:                return NULL;
                   1196:        }
                   1197:
1.346     ozaki-r  1198:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1199:        rtcache_unref(rt, ro);
1.340     ozaki-r  1200:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1201:
                   1202:        return ifatoia(rt->rt_ifa);
1.1       cgd      1203: }
                   1204:
                   1205: /*
1.311     rmind    1206:  * save_rte: save incoming source route for use in replies, to be picked
                   1207:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1208:  */
1.311     rmind    1209: static void
1.354     ozaki-r  1210: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1211: {
1.354     ozaki-r  1212:        struct ip_srcrt *isr;
                   1213:        struct m_tag *mtag;
1.1       cgd      1214:        unsigned olen;
                   1215:
                   1216:        olen = option[IPOPT_OLEN];
1.354     ozaki-r  1217:        if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
                   1218:                return;
                   1219:
                   1220:        mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
                   1221:        if (mtag == NULL)
1.1       cgd      1222:                return;
1.354     ozaki-r  1223:        isr = (struct ip_srcrt *)(mtag + 1);
                   1224:
                   1225:        memcpy(isr->isr_hdr, option, olen);
                   1226:        isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1227:        isr->isr_dst = dst;
                   1228:        m_tag_prepend(m, mtag);
1.1       cgd      1229: }
                   1230:
                   1231: /*
                   1232:  * Retrieve incoming source route for use in replies,
                   1233:  * in the same form used by setsockopt.
                   1234:  * The first hop is placed before the options, will be removed later.
                   1235:  */
                   1236: struct mbuf *
1.354     ozaki-r  1237: ip_srcroute(struct mbuf *m0)
1.1       cgd      1238: {
1.109     augustss 1239:        struct in_addr *p, *q;
                   1240:        struct mbuf *m;
1.354     ozaki-r  1241:        struct ip_srcrt *isr;
                   1242:        struct m_tag *mtag;
                   1243:
                   1244:        mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
                   1245:        if (mtag == NULL)
                   1246:                return NULL;
                   1247:        isr = (struct ip_srcrt *)(mtag + 1);
1.1       cgd      1248:
1.354     ozaki-r  1249:        if (isr->isr_nhops == 0)
1.237     dyoung   1250:                return NULL;
1.354     ozaki-r  1251:
1.1       cgd      1252:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.354     ozaki-r  1253:        if (m == NULL)
1.237     dyoung   1254:                return NULL;
1.1       cgd      1255:
1.164     matt     1256:        MCLAIM(m, &inetdomain.dom_mowner);
1.354     ozaki-r  1257: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1258:
1.354     ozaki-r  1259:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
                   1260:        m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1       cgd      1261:
                   1262:        /*
                   1263:         * First save first hop for return route
                   1264:         */
1.354     ozaki-r  1265:        p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1       cgd      1266:        *(mtod(m, struct in_addr *)) = *p--;
                   1267:
                   1268:        /*
                   1269:         * Copy option fields and padding (nop) to mbuf.
                   1270:         */
1.354     ozaki-r  1271:        isr->isr_nop = IPOPT_NOP;
                   1272:        isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1273:        memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244     christos 1274:            OPTSIZ);
                   1275:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1276:            sizeof(struct in_addr) + OPTSIZ);
                   1277: #undef OPTSIZ
                   1278:        /*
                   1279:         * Record return path as an IP source route,
                   1280:         * reversing the path (pointers are now aligned).
                   1281:         */
1.354     ozaki-r  1282:        while (p >= isr->isr_routes) {
1.1       cgd      1283:                *q++ = *p--;
                   1284:        }
                   1285:        /*
                   1286:         * Last hop goes to final destination.
                   1287:         */
1.354     ozaki-r  1288:        *q = isr->isr_dst;
                   1289:        m_tag_delete(m0, mtag);
                   1290:        return m;
1.1       cgd      1291: }
                   1292:
1.139     matt     1293: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1294:        [PRC_MSGSIZE] = EMSGSIZE,
                   1295:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1296:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1297:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1298:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1299:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1300:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1301:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1302:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1303: };
                   1304:
1.295     dyoung   1305: void
                   1306: ip_fasttimo(void)
                   1307: {
                   1308:        if (ip_drainwanted) {
                   1309:                ip_drain();
                   1310:                ip_drainwanted = 0;
                   1311:        }
                   1312: }
                   1313:
                   1314: void
                   1315: ip_drainstub(void)
                   1316: {
                   1317:        ip_drainwanted = 1;
                   1318: }
                   1319:
1.1       cgd      1320: /*
                   1321:  * Forward a packet.  If some error occurs return the sender
                   1322:  * an icmp packet.  Note we can't always generate a meaningful
                   1323:  * icmp message because icmp doesn't have a large enough repertoire
                   1324:  * of codes and types.
                   1325:  *
                   1326:  * If not forwarding, just drop the packet.  This could be confusing
                   1327:  * if ipforwarding was zero but some routing protocol was advancing
                   1328:  * us as a gateway to somewhere.  However, we must let the routing
                   1329:  * protocol deal with that.
                   1330:  *
                   1331:  * The srcrt parameter indicates whether the packet is being forwarded
                   1332:  * via a source route.
                   1333:  */
1.313     rmind    1334: static void
1.329     ozaki-r  1335: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1336: {
1.109     augustss 1337:        struct ip *ip = mtod(m, struct ip *);
                   1338:        struct rtentry *rt;
1.220     christos 1339:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1340:        struct mbuf *mcopy;
1.13      mycroft  1341:        n_long dest;
1.249     dyoung   1342:        union {
                   1343:                struct sockaddr         dst;
                   1344:                struct sockaddr_in      dst4;
                   1345:        } u;
1.320     ozaki-r  1346:        uint64_t *ips;
1.340     ozaki-r  1347:        struct route *ro;
1.164     matt     1348:
1.318     rmind    1349:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1350:            "interrupt handler; synchronization assumptions violated");
                   1351:
1.164     matt     1352:        /*
                   1353:         * We are now in the output path.
                   1354:         */
                   1355:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1356:
                   1357:        /*
                   1358:         * Clear any in-bound checksum flags for this packet.
                   1359:         */
                   1360:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1361:
1.13      mycroft  1362:        dest = 0;
1.93      sommerfe 1363:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1364:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1365:                m_freem(m);
                   1366:                return;
                   1367:        }
1.318     rmind    1368:
1.1       cgd      1369:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1370:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1371:                return;
                   1372:        }
                   1373:
1.249     dyoung   1374:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1375:
1.340     ozaki-r  1376:        ro = percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1377:        rt = rtcache_lookup(ro, &u.dst);
                   1378:        if (rt == NULL) {
1.340     ozaki-r  1379:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1380:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1381:                return;
1.1       cgd      1382:        }
                   1383:
                   1384:        /*
1.34      mycroft  1385:         * Save at most 68 bytes of the packet in case
1.1       cgd      1386:         * we need to generate an ICMP message to the src.
1.119     itojun   1387:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1388:         */
1.155     itojun   1389:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1390:        if (mcopy)
                   1391:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1392:
1.221     christos 1393:        ip->ip_ttl -= IPTTLDEC;
                   1394:
1.1       cgd      1395:        /*
                   1396:         * If forwarding packet using same interface that it came in on,
                   1397:         * perhaps should send a redirect to sender to shortcut a hop.
                   1398:         * Only send redirect if source is sending directly to us,
                   1399:         * and if packet was not source routed (or has any options).
                   1400:         * Also, don't send redirect if forwarding using a default route
                   1401:         * or a route modified by a redirect.
                   1402:         */
1.329     ozaki-r  1403:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1404:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1405:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1406:            ipsendredirects && !srcrt) {
1.19      mycroft  1407:                if (rt->rt_ifa &&
                   1408:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1409:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1410:                        if (rt->rt_flags & RTF_GATEWAY)
                   1411:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1412:                        else
                   1413:                                dest = ip->ip_dst.s_addr;
                   1414:                        /*
                   1415:                         * Router requirements says to only send host
                   1416:                         * redirects.
                   1417:                         */
                   1418:                        type = ICMP_REDIRECT;
                   1419:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1420:                }
                   1421:        }
1.345     ozaki-r  1422:        rtcache_unref(rt, ro);
1.1       cgd      1423:
1.340     ozaki-r  1424:        error = ip_output(m, NULL, ro,
1.173     jonathan 1425:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1426:            NULL, NULL);
1.173     jonathan 1427:
1.320     ozaki-r  1428:        if (error) {
1.266     thorpej  1429:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1430:                goto error;
                   1431:        }
                   1432:
                   1433:        ips = IP_STAT_GETREF();
                   1434:        ips[IP_STAT_FORWARD]++;
                   1435:
                   1436:        if (type) {
                   1437:                ips[IP_STAT_REDIRECTSENT]++;
                   1438:                IP_STAT_PUTREF();
                   1439:                goto redirect;
                   1440:        }
                   1441:
                   1442:        IP_STAT_PUTREF();
                   1443:        if (mcopy) {
1.63      matt     1444: #ifdef GATEWAY
1.320     ozaki-r  1445:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1446:                        ipflow_create(ro, mcopy);
1.63      matt     1447: #endif
1.320     ozaki-r  1448:                m_freem(mcopy);
1.1       cgd      1449:        }
1.320     ozaki-r  1450:
1.340     ozaki-r  1451:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1452:        return;
                   1453:
                   1454: redirect:
                   1455: error:
1.318     rmind    1456:        if (mcopy == NULL) {
1.340     ozaki-r  1457:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1458:                return;
1.318     rmind    1459:        }
1.13      mycroft  1460:
1.1       cgd      1461:        switch (error) {
                   1462:
                   1463:        case 0:                         /* forwarded, but need redirect */
                   1464:                /* type, code set above */
                   1465:                break;
                   1466:
                   1467:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1468:        case EHOSTUNREACH:
                   1469:        case ENETDOWN:
                   1470:        case EHOSTDOWN:
                   1471:        default:
                   1472:                type = ICMP_UNREACH;
                   1473:                code = ICMP_UNREACH_HOST;
                   1474:                break;
                   1475:
                   1476:        case EMSGSIZE:
                   1477:                type = ICMP_UNREACH;
                   1478:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1479:
1.345     ozaki-r  1480:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1481:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1482:                        rtcache_unref(rt, ro);
                   1483:                }
1.305     rmind    1484: #ifdef IPSEC
1.317     christos 1485:                if (ipsec_used)
                   1486:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1487: #endif
1.266     thorpej  1488:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1489:                break;
                   1490:
                   1491:        case ENOBUFS:
1.143     itojun   1492:                /*
1.311     rmind    1493:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1494:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1495:                 * big problem under DoS attacks or if the underlying
                   1496:                 * interface is rate-limited.
1.143     itojun   1497:                 */
                   1498:                if (mcopy)
                   1499:                        m_freem(mcopy);
1.340     ozaki-r  1500:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1501:                return;
1.1       cgd      1502:        }
1.220     christos 1503:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1504:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1505: }
                   1506:
                   1507: void
1.211     perry    1508: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1509:     struct mbuf *m)
1.44      thorpej  1510: {
1.311     rmind    1511:        struct socket *so = inp->inp_socket;
1.329     ozaki-r  1512:        ifnet_t *ifp;
1.311     rmind    1513:        int inpflags = inp->inp_flags;
1.329     ozaki-r  1514:        struct psref psref;
1.44      thorpej  1515:
1.329     ozaki-r  1516:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r  1517:        if (__predict_false(ifp == NULL))
                   1518:                return; /* XXX should report error? */
                   1519:
1.311     rmind    1520:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1521: #ifdef SO_OTIMESTAMP
1.311     rmind    1522:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1523: #endif
                   1524:            ) {
1.44      thorpej  1525:                struct timeval tv;
                   1526:
                   1527:                microtime(&tv);
1.278     christos 1528: #ifdef SO_OTIMESTAMP
1.311     rmind    1529:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1530:                        struct timeval50 tv50;
                   1531:                        timeval_to_timeval50(&tv, &tv50);
                   1532:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1533:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1534:                } else
                   1535: #endif
1.244     christos 1536:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1537:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1538:                if (*mp)
                   1539:                        mp = &(*mp)->m_next;
                   1540:        }
1.311     rmind    1541:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1542:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1543:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1544:                if (*mp)
                   1545:                        mp = &(*mp)->m_next;
                   1546:        }
1.311     rmind    1547:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1548:                struct in_pktinfo ipi;
1.307     christos 1549:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1550:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1551:                *mp = sbcreatecontrol((void *) &ipi,
                   1552:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1553:                if (*mp)
                   1554:                        mp = &(*mp)->m_next;
                   1555:        }
1.311     rmind    1556:        if (inpflags & INP_PKTINFO) {
1.306     christos 1557:                struct in_pktinfo ipi;
1.307     christos 1558:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1559:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1560:                *mp = sbcreatecontrol((void *) &ipi,
                   1561:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1562:                if (*mp)
                   1563:                        mp = &(*mp)->m_next;
                   1564:        }
1.311     rmind    1565:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1566:                struct sockaddr_dl sdl;
                   1567:
1.337     ozaki-r  1568:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1569:                    NULL, 0);
1.251     dyoung   1570:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1571:                if (*mp)
                   1572:                        mp = &(*mp)->m_next;
                   1573:        }
1.311     rmind    1574:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1575:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1576:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1577:                if (*mp)
                   1578:                        mp = &(*mp)->m_next;
                   1579:        }
1.329     ozaki-r  1580:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1581: }
                   1582:
1.189     atatat   1583: /*
1.228     elad     1584:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1585:  */
                   1586: static int
                   1587: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1588: {
                   1589:        int error, tmp;
                   1590:        struct sysctlnode node;
                   1591:
                   1592:        node = *rnode;
                   1593:        tmp = ip_forwsrcrt;
                   1594:        node.sysctl_data = &tmp;
                   1595:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1596:        if (error || newp == NULL)
                   1597:                return (error);
                   1598:
1.280     elad     1599:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1600:            0, NULL, NULL, NULL);
                   1601:        if (error)
                   1602:                return (error);
1.228     elad     1603:
                   1604:        ip_forwsrcrt = tmp;
                   1605:
                   1606:        return (0);
                   1607: }
                   1608:
                   1609: /*
1.189     atatat   1610:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1611:  * range of the new value and tweaks timers if it changes.
                   1612:  */
                   1613: static int
                   1614: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1615: {
1.189     atatat   1616:        int error, tmp;
                   1617:        struct sysctlnode node;
                   1618:
1.350     ozaki-r  1619:        icmp_mtudisc_lock();
                   1620:
1.189     atatat   1621:        node = *rnode;
                   1622:        tmp = ip_mtudisc_timeout;
                   1623:        node.sysctl_data = &tmp;
                   1624:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1625:        if (error || newp == NULL)
1.350     ozaki-r  1626:                goto out;
                   1627:        if (tmp < 0) {
                   1628:                error = EINVAL;
                   1629:                goto out;
                   1630:        }
1.273     matt     1631:
1.189     atatat   1632:        ip_mtudisc_timeout = tmp;
                   1633:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350     ozaki-r  1634:        error = 0;
                   1635: out:
                   1636:        icmp_mtudisc_unlock();
1.351     ozaki-r  1637:        return error;
1.189     atatat   1638: }
1.54      lukem    1639:
1.266     thorpej  1640: static int
                   1641: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1642: {
                   1643:
1.271     thorpej  1644:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1645: }
1.131     itojun   1646:
1.284     pooka    1647: static void
                   1648: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1649: {
1.197     atatat   1650:        sysctl_createv(clog, 0, NULL, NULL,
                   1651:                       CTLFLAG_PERMANENT,
1.203     atatat   1652:                       CTLTYPE_NODE, "inet",
                   1653:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1654:                       NULL, 0, NULL, 0,
                   1655:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1656:        sysctl_createv(clog, 0, NULL, NULL,
                   1657:                       CTLFLAG_PERMANENT,
1.203     atatat   1658:                       CTLTYPE_NODE, "ip",
                   1659:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1660:                       NULL, 0, NULL, 0,
                   1661:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1662:
1.197     atatat   1663:        sysctl_createv(clog, 0, NULL, NULL,
                   1664:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1665:                       CTLTYPE_INT, "forwarding",
                   1666:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1667:                       NULL, 0, &ipforwarding, 0,
                   1668:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1669:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1670:        sysctl_createv(clog, 0, NULL, NULL,
                   1671:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1672:                       CTLTYPE_INT, "redirect",
                   1673:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1674:                       NULL, 0, &ipsendredirects, 0,
                   1675:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1676:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1677:        sysctl_createv(clog, 0, NULL, NULL,
                   1678:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1679:                       CTLTYPE_INT, "ttl",
                   1680:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1681:                       NULL, 0, &ip_defttl, 0,
                   1682:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1683:                       IPCTL_DEFTTL, CTL_EOL);
                   1684: #ifdef IPCTL_DEFMTU
1.197     atatat   1685:        sysctl_createv(clog, 0, NULL, NULL,
                   1686:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1687:                       CTLTYPE_INT, "mtu",
                   1688:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1689:                       NULL, 0, &ip_mtu, 0,
                   1690:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1691:                       IPCTL_DEFMTU, CTL_EOL);
                   1692: #endif /* IPCTL_DEFMTU */
1.197     atatat   1693:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1694:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1695:                       CTLTYPE_INT, "forwsrcrt",
                   1696:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1697:                                    "datagrams"),
1.228     elad     1698:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1699:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1700:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1701:        sysctl_createv(clog, 0, NULL, NULL,
                   1702:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1703:                       CTLTYPE_INT, "directed-broadcast",
                   1704:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1705:                       NULL, 0, &ip_directedbcast, 0,
                   1706:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1707:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1708:        sysctl_createv(clog, 0, NULL, NULL,
                   1709:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1710:                       CTLTYPE_INT, "allowsrcrt",
                   1711:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1712:                       NULL, 0, &ip_allowsrcrt, 0,
                   1713:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1714:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1715:
1.197     atatat   1716:        sysctl_createv(clog, 0, NULL, NULL,
                   1717:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1718:                       CTLTYPE_INT, "mtudisc",
                   1719:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1720:                       NULL, 0, &ip_mtudisc, 0,
                   1721:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1722:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1723:        sysctl_createv(clog, 0, NULL, NULL,
                   1724:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1725:                       CTLTYPE_INT, "anonportmin",
                   1726:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1727:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1728:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1729:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1730:        sysctl_createv(clog, 0, NULL, NULL,
                   1731:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1732:                       CTLTYPE_INT, "anonportmax",
                   1733:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1734:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1735:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1736:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1737:        sysctl_createv(clog, 0, NULL, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1739:                       CTLTYPE_INT, "mtudisctimeout",
                   1740:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1741:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1742:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1743:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1744: #ifndef IPNOPRIVPORTS
1.197     atatat   1745:        sysctl_createv(clog, 0, NULL, NULL,
                   1746:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1747:                       CTLTYPE_INT, "lowportmin",
                   1748:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1749:                                    "to assign"),
1.189     atatat   1750:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1751:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1752:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1753:        sysctl_createv(clog, 0, NULL, NULL,
                   1754:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1755:                       CTLTYPE_INT, "lowportmax",
                   1756:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1757:                                    "to assign"),
1.189     atatat   1758:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1759:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1760:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1761: #endif /* IPNOPRIVPORTS */
                   1762: #if NGRE > 0
1.197     atatat   1763:        sysctl_createv(clog, 0, NULL, NULL,
                   1764:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1765:                       CTLTYPE_INT, "grettl",
                   1766:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1767:                       NULL, 0, &ip_gre_ttl, 0,
                   1768:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1769:                       IPCTL_GRE_TTL, CTL_EOL);
                   1770: #endif /* NGRE */
1.197     atatat   1771:        sysctl_createv(clog, 0, NULL, NULL,
                   1772:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1773:                       CTLTYPE_INT, "checkinterface",
                   1774:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1775:                                    "from RFC1122"),
1.189     atatat   1776:                       NULL, 0, &ip_checkinterface, 0,
                   1777:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1778:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1779:        sysctl_createv(clog, 0, NULL, NULL,
                   1780:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1781:                       CTLTYPE_INT, "random_id",
                   1782:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1783:                       NULL, 0, &ip_do_randomid, 0,
                   1784:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1785:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1786:        sysctl_createv(clog, 0, NULL, NULL,
                   1787:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1788:                       CTLTYPE_INT, "do_loopback_cksum",
                   1789:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1790:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1791:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1792:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1793:        sysctl_createv(clog, 0, NULL, NULL,
                   1794:                       CTLFLAG_PERMANENT,
                   1795:                       CTLTYPE_STRUCT, "stats",
                   1796:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1797:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1798:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1799:                       CTL_EOL);
1.322     joerg    1800: #if NARP
1.321     roy      1801:        sysctl_createv(clog, 0, NULL, NULL,
                   1802:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1803:                       CTLTYPE_INT, "dad_count",
                   1804:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1805:                                    "probes to send"),
                   1806:                       NULL, 0, &ip_dad_count, 0,
                   1807:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1808:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1809: #endif
1.301     christos 1810:
                   1811:        /* anonportalgo RFC6056 subtree */
1.302     christos 1812:        const struct sysctlnode *portalgo_node;
                   1813:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1814:                       CTLFLAG_PERMANENT,
                   1815:                       CTLTYPE_NODE, "anonportalgo",
                   1816:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1817:                       NULL, 0, NULL, 0,
                   1818:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1819:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1820:                       CTLFLAG_PERMANENT,
                   1821:                       CTLTYPE_STRING, "available",
                   1822:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1823:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1824:                       CTL_CREATE, CTL_EOL);
1.302     christos 1825:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1826:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1827:                       CTLTYPE_STRING, "selected",
                   1828:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1829:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1830:                       CTL_CREATE, CTL_EOL);
                   1831:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1832:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1833:                       CTLTYPE_STRUCT, "reserve",
                   1834:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1835:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1836:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1837: }
1.266     thorpej  1838:
                   1839: void
                   1840: ip_statinc(u_int stat)
                   1841: {
                   1842:
                   1843:        KASSERT(stat < IP_NSTATS);
                   1844:        IP_STATINC(stat);
                   1845: }

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