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Annotation of src/sys/netinet/ip_input.c, Revision 1.319.4.10

1.319.4.10! skrll       1: /*     $NetBSD: ip_input.c,v 1.319.4.9 2017/02/05 13:40:59 skrll 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>
1.319.4.10! skrll      94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.319.4.9 2017/02/05 13:40:59 skrll Exp $");
1.55      scottr     95:
1.319.4.3  skrll      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.62      matt       98: #include "opt_gateway.h"
1.91      thorpej    99: #include "opt_ipsec.h"
1.55      scottr    100: #include "opt_mrouting.h"
1.167     martin    101: #include "opt_mbuftrace.h"
1.135     thorpej   102: #include "opt_inet_csum.h"
1.319.4.8  skrll     103: #include "opt_net_mpsafe.h"
1.319.4.3  skrll     104: #endif
1.1       cgd       105:
1.319.4.4  skrll     106: #include "arp.h"
                    107:
1.5       mycroft   108: #include <sys/param.h>
                    109: #include <sys/systm.h>
1.318     rmind     110: #include <sys/cpu.h>
1.5       mycroft   111: #include <sys/mbuf.h>
                    112: #include <sys/domain.h>
                    113: #include <sys/protosw.h>
                    114: #include <sys/socket.h>
1.44      thorpej   115: #include <sys/socketvar.h>
1.5       mycroft   116: #include <sys/errno.h>
                    117: #include <sys/time.h>
                    118: #include <sys/kernel.h>
1.72      thorpej   119: #include <sys/pool.h>
1.28      christos  120: #include <sys/sysctl.h>
1.230     elad      121: #include <sys/kauth.h>
1.1       cgd       122:
1.5       mycroft   123: #include <net/if.h>
1.44      thorpej   124: #include <net/if_dl.h>
1.5       mycroft   125: #include <net/route.h>
1.318     rmind     126: #include <net/pktqueue.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
1.215     yamt      133: #include <netinet/in_proto.h>
1.5       mycroft   134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
1.266     thorpej   136: #include <netinet/ip_private.h>
1.5       mycroft   137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
1.144     martin    141: #include <net/if_gre.h>
                    142: #include "gre.h"
1.111     jdolecek  143:
                    144: #ifdef MROUTING
                    145: #include <netinet/ip_mroute.h>
                    146: #endif
1.302     christos  147: #include <netinet/portalgo.h>
1.89      itojun    148:
1.304     christos  149: #ifdef IPSEC
1.173     jonathan  150: #include <netipsec/ipsec.h>
1.305     rmind     151: #endif
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    156: #else /* GATEWAY */
                    157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
                    158: #endif /* GATEWAY */
                    159: #endif /* IPFORWARDING */
                    160: #ifndef        IPSENDREDIRECTS
                    161: #define        IPSENDREDIRECTS 1
                    162: #endif
1.26      thorpej   163: #ifndef IPFORWSRCRT
1.47      cjs       164: #define        IPFORWSRCRT     1       /* forward source-routed packets */
                    165: #endif
                    166: #ifndef IPALLOWSRCRT
1.48      mrg       167: #define        IPALLOWSRCRT    1       /* allow source-routed packets */
1.26      thorpej   168: #endif
1.53      kml       169: #ifndef IPMTUDISC
1.153     itojun    170: #define IPMTUDISC      1
1.53      kml       171: #endif
1.60      kml       172: #ifndef IPMTUDISCTIMEOUT
1.61      kml       173: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.60      kml       174: #endif
1.53      kml       175:
1.27      thorpej   176: /*
                    177:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    178:  * configuration using this option will Just Work.
                    179:  */
                    180: #ifndef IPDIRECTEDBCAST
                    181: #ifdef DIRECTED_BROADCAST
                    182: #define IPDIRECTEDBCAST        1
                    183: #else
                    184: #define        IPDIRECTEDBCAST 0
                    185: #endif /* DIRECTED_BROADCAST */
                    186: #endif /* IPDIRECTEDBCAST */
1.1       cgd       187: int    ipforwarding = IPFORWARDING;
                    188: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   189: int    ip_defttl = IPDEFTTL;
1.26      thorpej   190: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   191: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       192: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       193: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    194: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       195: #ifdef DIAGNOSTIC
                    196: int    ipprintfs = 0;
                    197: #endif
1.184     jonathan  198:
                    199: int    ip_do_randomid = 0;
                    200:
1.165     christos  201: /*
                    202:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    203:  * the Strong ES model described in RFC 1122, but since the routing table
                    204:  * and transmit implementation do not implement the Strong ES model,
                    205:  * setting this to 1 results in an odd hybrid.
                    206:  *
                    207:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    208:  * to translate the destination address to another local interface.
                    209:  *
                    210:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    211:  * to the loopback interface instead of the interface where the
                    212:  * packets for those addresses are received.
                    213:  */
1.318     rmind     214: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  215:
1.60      kml       216: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    217:
1.318     rmind     218: pktqueue_t *           ip_pktq                 __read_mostly;
                    219: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    220: ipid_state_t *         ip_ids                  __read_mostly;
                    221: percpu_t *             ipstat_percpu           __read_mostly;
                    222:
1.319.4.7  skrll     223: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       224:
1.183     jonathan  225: uint16_t ip_id;
1.75      thorpej   226:
1.135     thorpej   227: #ifdef INET_CSUM_COUNTERS
                    228: #include <sys/device.h>
                    229:
                    230: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    231:     NULL, "inet", "hwcsum bad");
                    232: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    233:     NULL, "inet", "hwcsum ok");
                    234: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    235:     NULL, "inet", "swcsum");
                    236:
                    237: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    238:
1.201     matt      239: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    240: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    241: EVCNT_ATTACH_STATIC(ip_swcsum);
                    242:
1.135     thorpej   243: #else
                    244:
                    245: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    246:
                    247: #endif /* INET_CSUM_COUNTERS */
                    248:
1.1       cgd       249: /*
1.319.4.10! skrll     250:  * Used to save the IP options in case a protocol wants to respond
1.1       cgd       251:  * to an incoming packet over the same route if the packet got here
                    252:  * using IP source routing.  This allows connection establishment and
                    253:  * maintenance when the remote end is on a network that is not known
                    254:  * to us.
                    255:  */
1.319.4.10! skrll     256: struct ip_srcrt {
        !           257:        int             isr_nhops;                 /* number of hops */
        !           258:        struct in_addr  isr_dst;                   /* final destination */
        !           259:        char            isr_nop;                   /* one NOP to align */
        !           260:        char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
        !           261:        struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
        !           262: };
1.1       cgd       263:
1.295     dyoung    264: static int ip_drainwanted;
                    265:
1.319.4.10! skrll     266: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35      mycroft   267:
1.164     matt      268: #ifdef MBUFTRACE
1.234     dogcow    269: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    270: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      271: #endif
                    272:
1.318     rmind     273: static void            ipintr(void *);
1.312     rmind     274: static void            ip_input(struct mbuf *);
1.319.4.6  skrll     275: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     276: static bool            ip_dooptions(struct mbuf *);
1.319.4.9  skrll     277: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     278: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     279:
1.319.4.6  skrll     280: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    281:                            int *);
                    282: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    283:                            struct ip *);
                    284:
1.319.4.8  skrll     285: #ifdef NET_MPSAFE
                    286: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    287: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    288: #else
1.318     rmind     289: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    290: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.319.4.8  skrll     291: #endif
1.318     rmind     292:
1.1       cgd       293: /*
                    294:  * IP initialization: fill in IP protocol switch table.
                    295:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    296:  */
1.8       mycroft   297: void
1.211     perry     298: ip_init(void)
1.1       cgd       299: {
1.199     matt      300:        const struct protosw *pr;
1.1       cgd       301:
1.311     rmind     302:        in_init();
1.284     pooka     303:        sysctl_net_inet_ip_setup(NULL);
                    304:
1.311     rmind     305:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    306:        KASSERT(pr != NULL);
1.275     pooka     307:
1.319     ozaki-r   308:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     309:        KASSERT(ip_pktq != NULL);
                    310:
1.311     rmind     311:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
1.1       cgd       312:                ip_protox[i] = pr - inetsw;
1.311     rmind     313:        }
1.1       cgd       314:        for (pr = inetdomain.dom_protosw;
                    315:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
                    316:                if (pr->pr_domain->dom_family == PF_INET &&
                    317:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    318:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  319:
1.288     rmind     320:        ip_reass_init();
1.190     jonathan  321:
1.291     rmind     322:        ip_ids = ip_id_init();
1.319.4.3  skrll     323:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  324:
1.73      thorpej   325: #ifdef GATEWAY
1.311     rmind     326:        ipflow_init();
1.73      thorpej   327: #endif
1.121     thorpej   328:
                    329:        /* Register our Packet Filter hook. */
1.308     rmind     330:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    331:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   332:
1.164     matt      333: #ifdef MBUFTRACE
                    334:        MOWNER_ATTACH(&ip_tx_mowner);
                    335:        MOWNER_ATTACH(&ip_rx_mowner);
                    336: #endif /* MBUFTRACE */
1.266     thorpej   337:
                    338:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.319.4.7  skrll     339:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
1.319.4.10! skrll     340:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       341: }
                    342:
1.319.4.6  skrll     343: static struct in_ifaddr *
                    344: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    345: {
                    346:        struct in_ifaddr *ia = NULL;
                    347:        int checkif;
                    348:
                    349:        /*
                    350:         * Enable a consistency check between the destination address
                    351:         * and the arrival interface for a unicast packet (the RFC 1122
                    352:         * strong ES model) if IP forwarding is disabled and the packet
                    353:         * is not locally generated.
                    354:         *
                    355:         * XXX - Checking also should be disabled if the destination
                    356:         * address is ipnat'ed to a different interface.
                    357:         *
                    358:         * XXX - Checking is incompatible with IP aliases added
                    359:         * to the loopback interface instead of the interface where
                    360:         * the packets are received.
                    361:         *
                    362:         * XXX - We need to add a per ifaddr flag for this so that
                    363:         * we get finer grain control.
                    364:         */
                    365:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    366:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    367:
                    368:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
                    369:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    370:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    371:                                continue;
                    372:                        if (checkif && ia->ia_ifp != ifp)
                    373:                                continue;
1.319.4.7  skrll     374:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
                    375:                            (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.319.4.6  skrll     376:                                break;
                    377:                        else
1.319.4.7  skrll     378:                                (*downmatch)++;
1.319.4.6  skrll     379:                }
                    380:        }
                    381:
                    382:        return ia;
                    383: }
                    384:
                    385: static struct in_ifaddr *
                    386: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    387: {
                    388:        struct in_ifaddr *ia = NULL;
                    389:        struct ifaddr *ifa;
                    390:
                    391:        IFADDR_READER_FOREACH(ifa, ifp) {
                    392:                if (ifa->ifa_addr->sa_family != AF_INET)
                    393:                        continue;
                    394:                ia = ifatoia(ifa);
1.319.4.7  skrll     395:                if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.319.4.6  skrll     396:                        continue;
                    397:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    398:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    399:                    /*
                    400:                     * Look for all-0's host part (old broadcast addr),
                    401:                     * either for subnet or net.
                    402:                     */
                    403:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    404:                    ip->ip_dst.s_addr == ia->ia_net)
                    405:                        goto matched;
                    406:                /*
                    407:                 * An interface with IP address zero accepts
                    408:                 * all packets that arrive on that interface.
                    409:                 */
                    410:                if (in_nullhost(ia->ia_addr.sin_addr))
                    411:                        goto matched;
                    412:        }
                    413:        ia = NULL;
                    414:
                    415: matched:
                    416:        return ia;
                    417: }
                    418:
1.1       cgd       419: /*
1.318     rmind     420:  * IP software interrupt routine.
1.89      itojun    421:  */
1.318     rmind     422: static void
                    423: ipintr(void *arg __unused)
1.89      itojun    424: {
                    425:        struct mbuf *m;
1.286     tls       426:
1.318     rmind     427:        KASSERT(cpu_softintr_p());
1.89      itojun    428:
1.319.4.8  skrll     429: #ifndef NET_MPSAFE
1.268     ad        430:        mutex_enter(softnet_lock);
1.319.4.8  skrll     431: #endif
1.318     rmind     432:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    433:                ip_input(m);
                    434:        }
1.319.4.8  skrll     435: #ifndef NET_MPSAFE
1.268     ad        436:        mutex_exit(softnet_lock);
1.319.4.8  skrll     437: #endif
1.89      itojun    438: }
                    439:
                    440: /*
1.318     rmind     441:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       442:  * try to reassemble.  Process options.  Pass to next level.
                    443:  */
1.312     rmind     444: static void
1.89      itojun    445: ip_input(struct mbuf *m)
1.1       cgd       446: {
1.109     augustss  447:        struct ip *ip = NULL;
1.319.4.7  skrll     448:        struct in_ifaddr *ia = NULL;
1.288     rmind     449:        int hlen = 0, len;
1.100     itojun    450:        int downmatch;
1.169     itojun    451:        int srcrt = 0;
1.314     rmind     452:        ifnet_t *ifp;
1.319.4.6  skrll     453:        struct psref psref;
1.319.4.7  skrll     454:        int s;
1.1       cgd       455:
1.318     rmind     456:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    457:            "interrupt handler; synchronization assumptions violated");
                    458:
1.164     matt      459:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     460:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.319.4.6  skrll     461:
                    462:        ifp = m_get_rcvif_psref(m, &psref);
                    463:        if (__predict_false(ifp == NULL))
                    464:                goto out;
1.164     matt      465:
1.1       cgd       466:        /*
                    467:         * If no IP addresses have been set yet but the interfaces
                    468:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     469:         * Note: we pre-check without locks held.
1.1       cgd       470:         */
1.319.4.6  skrll     471:        if (IN_ADDRLIST_READER_EMPTY())
                    472:                goto out;
1.266     thorpej   473:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     474:
1.154     thorpej   475:        /*
                    476:         * If the IP header is not aligned, slurp it up into a new
                    477:         * mbuf with space for link headers, in the event we forward
                    478:         * it.  Otherwise, if it is aligned, make sure the entire
                    479:         * base IP header is in the first mbuf of the chain.
                    480:         */
1.244     christos  481:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   482:                if ((m = m_copyup(m, sizeof(struct ip),
                    483:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    484:                        /* XXXJRT new stat, please */
1.266     thorpej   485:                        IP_STATINC(IP_STAT_TOOSMALL);
1.319.4.6  skrll     486:                        goto out;
1.154     thorpej   487:                }
                    488:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    489:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   490:                        IP_STATINC(IP_STAT_TOOSMALL);
1.319.4.6  skrll     491:                        goto out;
1.154     thorpej   492:                }
1.1       cgd       493:        }
                    494:        ip = mtod(m, struct ip *);
1.13      mycroft   495:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   496:                IP_STATINC(IP_STAT_BADVERS);
1.319.4.6  skrll     497:                goto out;
1.13      mycroft   498:        }
1.1       cgd       499:        hlen = ip->ip_hl << 2;
                    500:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   501:                IP_STATINC(IP_STAT_BADHLEN);
1.319.4.6  skrll     502:                goto out;
1.1       cgd       503:        }
                    504:        if (hlen > m->m_len) {
1.298     liamjfoy  505:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   506:                        IP_STATINC(IP_STAT_BADHLEN);
1.319.4.6  skrll     507:                        goto out;
1.1       cgd       508:                }
                    509:                ip = mtod(m, struct ip *);
                    510:        }
1.98      thorpej   511:
1.85      hwr       512:        /*
1.99      thorpej   513:         * RFC1122: packets with a multicast source address are
1.98      thorpej   514:         * not allowed.
1.85      hwr       515:         */
                    516:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   517:                IP_STATINC(IP_STAT_BADADDR);
1.319.4.6  skrll     518:                goto out;
1.129     itojun    519:        }
                    520:
                    521:        /* 127/8 must not appear on wire - RFC1122 */
                    522:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    523:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     524:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   525:                        IP_STATINC(IP_STAT_BADADDR);
1.319.4.6  skrll     526:                        goto out;
1.130     itojun    527:                }
1.85      hwr       528:        }
                    529:
1.135     thorpej   530:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     531:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   532:                 M_CSUM_IPv4_BAD)) {
                    533:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    534:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.319.4.6  skrll     535:                IP_STATINC(IP_STAT_BADSUM);
                    536:                goto out;
1.135     thorpej   537:
                    538:        case M_CSUM_IPv4:
                    539:                /* Checksum was okay. */
                    540:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    541:                break;
                    542:
                    543:        default:
1.206     thorpej   544:                /*
                    545:                 * Must compute it ourselves.  Maybe skip checksum on
                    546:                 * loopback interfaces.
                    547:                 */
1.314     rmind     548:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    549:                    ip_do_loopback_cksum)) {
1.206     thorpej   550:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.319.4.6  skrll     551:                        if (in_cksum(m, hlen) != 0) {
                    552:                                IP_STATINC(IP_STAT_BADSUM);
                    553:                                goto out;
                    554:                        }
1.206     thorpej   555:                }
1.135     thorpej   556:                break;
1.1       cgd       557:        }
                    558:
1.121     thorpej   559:        /* Retrieve the packet length. */
                    560:        len = ntohs(ip->ip_len);
1.81      proff     561:
                    562:        /*
                    563:         * Check for additional length bogosity
                    564:         */
1.84      proff     565:        if (len < hlen) {
1.266     thorpej   566:                IP_STATINC(IP_STAT_BADLEN);
1.319.4.6  skrll     567:                goto out;
1.81      proff     568:        }
1.1       cgd       569:
                    570:        /*
                    571:         * Check that the amount of data in the buffers
                    572:         * is as at least much as the IP header would have us expect.
                    573:         * Trim mbufs if longer than we expect.
                    574:         * Drop packet if shorter than we expect.
                    575:         */
1.35      mycroft   576:        if (m->m_pkthdr.len < len) {
1.266     thorpej   577:                IP_STATINC(IP_STAT_TOOSHORT);
1.319.4.6  skrll     578:                goto out;
1.1       cgd       579:        }
1.35      mycroft   580:        if (m->m_pkthdr.len > len) {
1.1       cgd       581:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   582:                        m->m_len = len;
                    583:                        m->m_pkthdr.len = len;
1.1       cgd       584:                } else
1.35      mycroft   585:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       586:        }
                    587:
1.64      thorpej   588:        /*
                    589:         * Assume that we can create a fast-forward IP flow entry
                    590:         * based on this packet.
                    591:         */
                    592:        m->m_flags |= M_CANFASTFWD;
                    593:
1.33      mrg       594:        /*
1.64      thorpej   595:         * Run through list of hooks for input packets.  If there are any
                    596:         * filters which require that additional packets in the flow are
                    597:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    598:         * Note that filters must _never_ set this flag, as another filter
                    599:         * in the list may have previously cleared it.
1.33      mrg       600:         */
1.304     christos  601: #if defined(IPSEC)
1.317     christos  602:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    603: #else
                    604:        if (1)
                    605: #endif
                    606:        {
1.314     rmind     607:                struct in_addr odst = ip->ip_dst;
1.318     rmind     608:                bool freed;
1.169     itojun    609:
1.318     rmind     610:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    611:                if (freed || m == NULL) {
1.319.4.8  skrll     612:                        m = NULL;
1.319.4.6  skrll     613:                        goto out;
1.318     rmind     614:                }
1.127     itojun    615:                ip = mtod(m, struct ip *);
1.142     darrenr   616:                hlen = ip->ip_hl << 2;
1.318     rmind     617:
1.205     darrenr   618:                /*
                    619:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    620:                 * from generating ICMP redirects for packets that have
                    621:                 * been redirected by a hook back out on to the same LAN that
                    622:                 * they came from and is not an indication that the packet
                    623:                 * is being inffluenced by source routing options.  This
                    624:                 * allows things like
                    625:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    626:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    627:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    628:                 * also requires a "map tlp0 ..." to complete the story.
                    629:                 * One might argue whether or not this kind of network config.
1.212     perry     630:                 * should be supported in this manner...
1.205     darrenr   631:                 */
1.169     itojun    632:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    633:        }
1.123     thorpej   634:
                    635: #ifdef ALTQ
                    636:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     637:        if (altq_input) {
                    638:                SOFTNET_LOCK();
                    639:                if ((*altq_input)(m, AF_INET) == 0) {
                    640:                        /* Packet dropped by traffic conditioner. */
                    641:                        SOFTNET_UNLOCK();
1.319.4.8  skrll     642:                        m = NULL;
1.319.4.6  skrll     643:                        goto out;
1.318     rmind     644:                }
                    645:                SOFTNET_UNLOCK();
1.123     thorpej   646:        }
                    647: #endif
1.121     thorpej   648:
                    649:        /*
1.1       cgd       650:         * Process options and, if not destined for us,
                    651:         * ship it on.  ip_dooptions returns 1 when an
                    652:         * error was detected (causing an icmp message
                    653:         * to be sent and the original packet to be freed).
                    654:         */
1.319.4.8  skrll     655:        if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                    656:                m = NULL;
1.319.4.6  skrll     657:                goto out;
1.319.4.8  skrll     658:        }
1.165     christos  659:
                    660:        /*
1.1       cgd       661:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    662:         *
                    663:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    664:         * The behavior here is to treat addresses on !IFF_UP interface
1.319.4.2  skrll     665:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       666:         */
1.100     itojun    667:        downmatch = 0;
1.319.4.7  skrll     668:        s = pserialize_read_enter();
1.319.4.6  skrll     669:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.319.4.7  skrll     670:        if (ia != NULL) {
                    671:                pserialize_read_exit(s);
1.86      thorpej   672:                goto ours;
1.319.4.7  skrll     673:        }
1.319.4.6  skrll     674:
1.315     christos  675:        if (ifp->if_flags & IFF_BROADCAST) {
1.319.4.6  skrll     676:                ia = ip_match_our_address_broadcast(ifp, ip);
1.319.4.7  skrll     677:                if (ia != NULL) {
                    678:                        pserialize_read_exit(s);
1.319.4.6  skrll     679:                        goto ours;
1.319.4.7  skrll     680:                }
1.1       cgd       681:        }
1.319.4.7  skrll     682:        pserialize_read_exit(s);
1.319.4.6  skrll     683:
1.18      mycroft   684:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   685: #ifdef MROUTING
                    686:                extern struct socket *ip_mrouter;
1.10      brezak    687:
1.4       hpeyerl   688:                if (ip_mrouter) {
                    689:                        /*
                    690:                         * If we are acting as a multicast router, all
                    691:                         * incoming multicast packets are passed to the
                    692:                         * kernel-level multicast forwarding function.
                    693:                         * The packet is returned (relatively) intact; if
                    694:                         * ip_mforward() returns a non-zero value, the packet
                    695:                         * must be discarded, else it may be accepted below.
                    696:                         *
                    697:                         * (The IP ident field is put in the same byte order
                    698:                         * as expected when ip_mforward() is called from
                    699:                         * ip_output().)
                    700:                         */
1.318     rmind     701:                        SOFTNET_LOCK();
1.314     rmind     702:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     703:                                SOFTNET_UNLOCK();
1.266     thorpej   704:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.319.4.6  skrll     705:                                goto out;
1.4       hpeyerl   706:                        }
1.318     rmind     707:                        SOFTNET_UNLOCK();
1.4       hpeyerl   708:
                    709:                        /*
                    710:                         * The process-level routing demon needs to receive
                    711:                         * all multicast IGMP packets, whether or not this
                    712:                         * host belongs to their destination groups.
                    713:                         */
1.318     rmind     714:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   715:                                goto ours;
1.318     rmind     716:                        }
1.266     thorpej   717:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   718:                }
                    719: #endif
                    720:                /*
                    721:                 * See if we belong to the destination multicast group on the
                    722:                 * arrival interface.
                    723:                 */
1.316     rmind     724:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   725:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.319.4.6  skrll     726:                        goto out;
1.4       hpeyerl   727:                }
                    728:                goto ours;
                    729:        }
1.19      mycroft   730:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   731:            in_nullhost(ip->ip_dst))
1.1       cgd       732:                goto ours;
                    733:
                    734:        /*
                    735:         * Not for us; forward if possible and desirable.
                    736:         */
                    737:        if (ipforwarding == 0) {
1.319.4.6  skrll     738:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   739:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       740:                m_freem(m);
1.100     itojun    741:        } else {
                    742:                /*
                    743:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    744:                 * and there's no IFF_UP interface that matches ip_dst,
                    745:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    746:                 * forwarding loop till TTL goes to 0.
                    747:                 */
                    748:                if (downmatch) {
1.319.4.6  skrll     749:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    750:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   751:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    752:                        return;
                    753:                }
1.304     christos  754: #ifdef IPSEC
1.319.4.10! skrll     755:                /* Check the security policy (SP) for the packet */
1.318     rmind     756:                if (ipsec_used) {
                    757:                        if (ipsec4_input(m, IP_FORWARDING |
                    758:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
1.319.4.6  skrll     759:                                goto out;
1.318     rmind     760:                        }
1.173     jonathan  761:                }
1.305     rmind     762: #endif
1.319.4.6  skrll     763:                ip_forward(m, srcrt, ifp);
                    764:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    765:        }
1.89      itojun    766:        return;
1.1       cgd       767:
                    768: ours:
1.319.4.6  skrll     769:        m_put_rcvif_psref(ifp, &psref);
                    770:        ifp = NULL;
                    771:
1.1       cgd       772:        /*
                    773:         * If offset or IP_MF are set, must reassemble.
                    774:         */
1.155     itojun    775:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     776:                /*
                    777:                 * Pass to IP reassembly mechanism.
                    778:                 */
1.290     rmind     779:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     780:                        /* Failed; invalid fragment(s) or packet. */
1.319.4.6  skrll     781:                        goto out;
1.16      cgd       782:                }
1.290     rmind     783:                if (m == NULL) {
1.289     rmind     784:                        /* More fragments should come; silently return. */
1.319.4.6  skrll     785:                        goto out;
1.289     rmind     786:                }
1.290     rmind     787:                /*
                    788:                 * Reassembly is done, we have the final packet.
                    789:                 * Updated cached data in local variable(s).
                    790:                 */
1.289     rmind     791:                ip = mtod(m, struct ip *);
                    792:                hlen = ip->ip_hl << 2;
1.79      mycroft   793:        }
1.128     itojun    794:
1.304     christos  795: #ifdef IPSEC
1.173     jonathan  796:        /*
1.305     rmind     797:         * Enforce IPsec policy checking if we are seeing last header.
                    798:         * Note that we do not visit this with protocols with PCB layer
                    799:         * code - like UDP/TCP/raw IP.
1.173     jonathan  800:         */
1.317     christos  801:        if (ipsec_used &&
                    802:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.305     rmind     803:                if (ipsec4_input(m, 0) != 0) {
1.319.4.6  skrll     804:                        goto out;
1.173     jonathan  805:                }
                    806:        }
1.305     rmind     807: #endif
1.1       cgd       808:
                    809:        /*
                    810:         * Switch out to protocol's input routine.
                    811:         */
1.82      aidan     812: #if IFA_STATS
1.319.4.7  skrll     813:        if (ia && ip) {
                    814:                struct in_ifaddr *_ia;
                    815:                /*
                    816:                 * Keep a reference from ip_match_our_address with psref
                    817:                 * is expensive, so explore ia here again.
                    818:                 */
                    819:                s = pserialize_read_enter();
1.319.4.8  skrll     820:                _ia = in_get_ia(ip->ip_dst);
1.319.4.7  skrll     821:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    822:                pserialize_read_exit(s);
                    823:        }
1.82      aidan     824: #endif
1.266     thorpej   825:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    826:
1.318     rmind     827:        const int off = hlen, nh = ip->ip_p;
                    828:
                    829:        SOFTNET_LOCK();
1.89      itojun    830:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318     rmind     831:        SOFTNET_UNLOCK();
1.89      itojun    832:        return;
1.135     thorpej   833:
1.319.4.6  skrll     834: out:
                    835:        m_put_rcvif_psref(ifp, &psref);
                    836:        if (m != NULL)
                    837:                m_freem(m);
1.1       cgd       838: }
                    839:
                    840: /*
1.288     rmind     841:  * IP timer processing.
1.1       cgd       842:  */
1.8       mycroft   843: void
1.211     perry     844: ip_slowtimo(void)
1.1       cgd       845: {
1.268     ad        846:
1.319.4.9  skrll     847: #ifndef NET_MPSAFE
1.268     ad        848:        mutex_enter(softnet_lock);
                    849:        KERNEL_LOCK(1, NULL);
1.319.4.9  skrll     850: #endif
1.1       cgd       851:
1.288     rmind     852:        ip_reass_slowtimo();
1.268     ad        853:
1.319.4.9  skrll     854: #ifndef NET_MPSAFE
1.268     ad        855:        KERNEL_UNLOCK_ONE(NULL);
                    856:        mutex_exit(softnet_lock);
1.319.4.9  skrll     857: #endif
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;
1.319.4.10! skrll     889:        struct ifaddr *ifa = NULL;
1.319.4.7  skrll     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:
1.319.4.9  skrll     927:                case IPOPT_SSRR: {
                    928:                        struct psref psref;
1.319.4.10! skrll     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;
1.319.4.7  skrll     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:                        }
1.319.4.7  skrll     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:                                 */
1.319.4.10! skrll     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));
1.319.4.7  skrll     979:                        if (opt == IPOPT_SSRR) {
1.319.4.9  skrll     980:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    981:                                    &psref);
1.319.4.7  skrll     982:                                if (ifa != NULL)
                    983:                                        ia = ifatoia(ifa);
                    984:                                else
                    985:                                        ia = NULL;
                    986:                        } else {
1.319.4.9  skrll     987:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.319.4.7  skrll     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));
1.319.4.9  skrll     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;
1.319.4.9  skrll    1004:                    }
1.1       cgd      1005:
1.319.4.9  skrll    1006:                case IPOPT_RR: {
                   1007:                        struct psref psref;
1.319.4.10! skrll    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:                         */
1.319.4.9  skrll    1033:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.319.4.7  skrll    1034:                        if (ifa == NULL) {
1.319.4.9  skrll    1035:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.319.4.7  skrll    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));
1.319.4.9  skrll    1046:                        ia4_release(ia, &psref);
1.1       cgd      1047:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1048:                        break;
1.319.4.9  skrll    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:
1.319.4.6  skrll    1076:                        case IPOPT_TS_TSANDADDR: {
                   1077:                                struct ifnet *rcvif;
1.319.4.7  skrll    1078:                                int _s, _ss;
1.319.4.10! skrll    1079:                                struct sockaddr_in ipaddr = {
        !          1080:                                    .sin_len = sizeof(ipaddr),
        !          1081:                                    .sin_family = AF_INET,
        !          1082:                                };
1.319.4.6  skrll    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;
1.319.4.7  skrll    1091:                                _ss = pserialize_read_enter();
                   1092:                                rcvif = m_get_rcvif(m, &_s);
1.319.4.10! skrll    1093:                                if (__predict_true(rcvif != NULL)) {
        !          1094:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
        !          1095:                                            rcvif);
        !          1096:                                }
1.319.4.7  skrll    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));
1.319.4.7  skrll    1105:                                pserialize_read_exit(_ss);
1.1       cgd      1106:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1107:                                break;
1.319.4.6  skrll    1108:                        }
1.1       cgd      1109:
1.319.4.10! skrll    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));
1.319.4.7  skrll    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;
1.319.4.7  skrll    1129:                                }
                   1130:                                pserialize_read_exit(s);
1.1       cgd      1131:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1132:                                break;
1.319.4.10! skrll    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) {
1.319.4.6  skrll    1149:                struct ifnet *rcvif;
1.319.4.7  skrll    1150:                struct psref _psref;
1.319.4.6  skrll    1151:
1.26      thorpej  1152:                if (ip_forwsrcrt == 0) {
                   1153:                        type = ICMP_UNREACH;
                   1154:                        code = ICMP_UNREACH_SRCFAIL;
                   1155:                        goto bad;
                   1156:                }
1.319.4.6  skrll    1157:
1.319.4.7  skrll    1158:                rcvif = m_get_rcvif_psref(m, &_psref);
1.319.4.6  skrll    1159:                if (__predict_false(rcvif == NULL)) {
                   1160:                        type = ICMP_UNREACH;
                   1161:                        code = ICMP_UNREACH_HOST;
                   1162:                        goto bad;
                   1163:                }
                   1164:                ip_forward(m, 1, rcvif);
1.319.4.7  skrll    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 *
1.319.4.9  skrll    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;
1.319.4.7  skrll    1187:        struct route *ro;
1.249     dyoung   1188:
                   1189:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1190:
1.319.4.7  skrll    1191:        ro = percpu_getref(ipforward_rt_percpu);
                   1192:        rt = rtcache_lookup(ro, &u.dst);
1.319.4.9  skrll    1193:        if (rt == NULL) {
                   1194:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1195:                return NULL;
1.319.4.9  skrll    1196:        }
                   1197:
                   1198:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
                   1199:        rtcache_unref(rt, ro);
                   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
1.319.4.10! skrll    1210: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1211: {
1.319.4.10! skrll    1212:        struct ip_srcrt *isr;
        !          1213:        struct m_tag *mtag;
1.1       cgd      1214:        unsigned olen;
                   1215:
                   1216:        olen = option[IPOPT_OLEN];
1.319.4.10! skrll    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;
1.319.4.10! skrll    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 *
1.319.4.10! skrll    1237: ip_srcroute(struct mbuf *m0)
1.1       cgd      1238: {
1.109     augustss 1239:        struct in_addr *p, *q;
                   1240:        struct mbuf *m;
1.319.4.10! skrll    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:
1.319.4.10! skrll    1249:        if (isr->isr_nhops == 0)
1.237     dyoung   1250:                return NULL;
1.319.4.10! skrll    1251:
1.1       cgd      1252:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.319.4.10! skrll    1253:        if (m == NULL)
1.237     dyoung   1254:                return NULL;
1.1       cgd      1255:
1.164     matt     1256:        MCLAIM(m, &inetdomain.dom_mowner);
1.319.4.10! skrll    1257: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1258:
1.319.4.10! skrll    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:         */
1.319.4.10! skrll    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:         */
1.319.4.10! skrll    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:         */
1.319.4.10! skrll    1282:        while (p >= isr->isr_routes) {
1.1       cgd      1283:                *q++ = *p--;
                   1284:        }
                   1285:        /*
                   1286:         * Last hop goes to final destination.
                   1287:         */
1.319.4.10! skrll    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
1.319.4.6  skrll    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;
1.319.4.1  skrll    1346:        uint64_t *ips;
1.319.4.7  skrll    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:
1.319.4.7  skrll    1376:        ro = percpu_getref(ipforward_rt_percpu);
1.319.4.9  skrll    1377:        rt = rtcache_lookup(ro, &u.dst);
                   1378:        if (rt == NULL) {
1.319.4.7  skrll    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:         */
1.319.4.6  skrll    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:        }
1.319.4.9  skrll    1422:        rtcache_unref(rt, ro);
1.1       cgd      1423:
1.319.4.7  skrll    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:
1.319.4.1  skrll    1428:        if (error) {
1.266     thorpej  1429:                IP_STATINC(IP_STAT_CANTFORWARD);
1.319.4.1  skrll    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
1.319.4.1  skrll    1445:                if (mcopy->m_flags & M_CANFASTFWD)
1.319.4.7  skrll    1446:                        ipflow_create(ro, mcopy);
1.63      matt     1447: #endif
1.319.4.1  skrll    1448:                m_freem(mcopy);
1.1       cgd      1449:        }
1.319.4.1  skrll    1450:
1.319.4.7  skrll    1451:        percpu_putref(ipforward_rt_percpu);
1.319.4.1  skrll    1452:        return;
                   1453:
                   1454: redirect:
                   1455: error:
1.318     rmind    1456:        if (mcopy == NULL) {
1.319.4.7  skrll    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:
1.319.4.9  skrll    1480:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1481:                        destmtu = rt->rt_ifp->if_mtu;
1.319.4.9  skrll    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);
1.319.4.7  skrll    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);
1.319.4.7  skrll    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;
                   1512:        int inpflags = inp->inp_flags;
1.319.4.6  skrll    1513:
1.319.4.10! skrll    1514:        if (SOOPT_TIMESTAMP(so->so_options))
        !          1515:                mp = sbsavetimestamp(so->so_options, m, mp);
1.44      thorpej  1516:
1.319.4.10! skrll    1517:        if (inpflags & INP_RECVDSTADDR) {
        !          1518:                *mp = sbcreatecontrol(&ip->ip_dst,
        !          1519:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1.44      thorpej  1520:                if (*mp)
                   1521:                        mp = &(*mp)->m_next;
                   1522:        }
1.319.4.10! skrll    1523:
        !          1524:        if (inpflags & INP_RECVTTL) {
        !          1525:                *mp = sbcreatecontrol(&ip->ip_ttl,
        !          1526:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1.44      thorpej  1527:                if (*mp)
                   1528:                        mp = &(*mp)->m_next;
                   1529:        }
1.319.4.10! skrll    1530:
        !          1531:        struct psref psref;
        !          1532:        ifnet_t *ifp = m_get_rcvif_psref(m, &psref);
        !          1533:        if (__predict_false(ifp == NULL)) {
        !          1534: #ifdef DIAGNOSTIC
        !          1535:                printf("%s: missing receive interface\n", __func__);
        !          1536: #endif
        !          1537:                return; /* XXX should report error? */
        !          1538:        }
        !          1539:
1.311     rmind    1540:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1541:                struct in_pktinfo ipi;
1.307     christos 1542:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1543:                ipi.ipi_ifindex = ifp->if_index;
1.319.4.10! skrll    1544:                *mp = sbcreatecontrol(&ipi,
1.306     christos 1545:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1546:                if (*mp)
                   1547:                        mp = &(*mp)->m_next;
                   1548:        }
1.311     rmind    1549:        if (inpflags & INP_PKTINFO) {
1.306     christos 1550:                struct in_pktinfo ipi;
1.307     christos 1551:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1552:                ipi.ipi_ifindex = ifp->if_index;
1.319.4.10! skrll    1553:                *mp = sbcreatecontrol(&ipi,
1.306     christos 1554:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1555:                if (*mp)
                   1556:                        mp = &(*mp)->m_next;
                   1557:        }
1.311     rmind    1558:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1559:                struct sockaddr_dl sdl;
                   1560:
1.319.4.6  skrll    1561:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1562:                    NULL, 0);
1.251     dyoung   1563:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1564:                if (*mp)
                   1565:                        mp = &(*mp)->m_next;
                   1566:        }
1.319.4.6  skrll    1567:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1568: }
                   1569:
1.189     atatat   1570: /*
1.228     elad     1571:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1572:  */
                   1573: static int
                   1574: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1575: {
                   1576:        int error, tmp;
                   1577:        struct sysctlnode node;
                   1578:
                   1579:        node = *rnode;
                   1580:        tmp = ip_forwsrcrt;
                   1581:        node.sysctl_data = &tmp;
                   1582:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1583:        if (error || newp == NULL)
                   1584:                return (error);
                   1585:
1.280     elad     1586:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1587:            0, NULL, NULL, NULL);
                   1588:        if (error)
                   1589:                return (error);
1.228     elad     1590:
                   1591:        ip_forwsrcrt = tmp;
                   1592:
                   1593:        return (0);
                   1594: }
                   1595:
                   1596: /*
1.189     atatat   1597:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1598:  * range of the new value and tweaks timers if it changes.
                   1599:  */
                   1600: static int
                   1601: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1602: {
1.189     atatat   1603:        int error, tmp;
                   1604:        struct sysctlnode node;
                   1605:
1.319.4.10! skrll    1606:        icmp_mtudisc_lock();
        !          1607:
1.189     atatat   1608:        node = *rnode;
                   1609:        tmp = ip_mtudisc_timeout;
                   1610:        node.sysctl_data = &tmp;
                   1611:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1612:        if (error || newp == NULL)
1.319.4.10! skrll    1613:                goto out;
        !          1614:        if (tmp < 0) {
        !          1615:                error = EINVAL;
        !          1616:                goto out;
        !          1617:        }
1.273     matt     1618:
1.189     atatat   1619:        ip_mtudisc_timeout = tmp;
                   1620:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.319.4.10! skrll    1621:        error = 0;
        !          1622: out:
        !          1623:        icmp_mtudisc_unlock();
        !          1624:        return error;
1.189     atatat   1625: }
1.54      lukem    1626:
1.266     thorpej  1627: static int
                   1628: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1629: {
                   1630:
1.271     thorpej  1631:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1632: }
1.131     itojun   1633:
1.284     pooka    1634: static void
                   1635: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1636: {
1.197     atatat   1637:        sysctl_createv(clog, 0, NULL, NULL,
                   1638:                       CTLFLAG_PERMANENT,
1.203     atatat   1639:                       CTLTYPE_NODE, "inet",
                   1640:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1641:                       NULL, 0, NULL, 0,
                   1642:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT,
1.203     atatat   1645:                       CTLTYPE_NODE, "ip",
                   1646:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1647:                       NULL, 0, NULL, 0,
                   1648:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1649:
1.197     atatat   1650:        sysctl_createv(clog, 0, NULL, NULL,
                   1651:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1652:                       CTLTYPE_INT, "forwarding",
                   1653:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1654:                       NULL, 0, &ipforwarding, 0,
                   1655:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1656:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1657:        sysctl_createv(clog, 0, NULL, NULL,
                   1658:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1659:                       CTLTYPE_INT, "redirect",
                   1660:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1661:                       NULL, 0, &ipsendredirects, 0,
                   1662:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1663:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1664:        sysctl_createv(clog, 0, NULL, NULL,
                   1665:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1666:                       CTLTYPE_INT, "ttl",
                   1667:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1668:                       NULL, 0, &ip_defttl, 0,
                   1669:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1670:                       IPCTL_DEFTTL, CTL_EOL);
                   1671: #ifdef IPCTL_DEFMTU
1.197     atatat   1672:        sysctl_createv(clog, 0, NULL, NULL,
                   1673:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1674:                       CTLTYPE_INT, "mtu",
                   1675:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1676:                       NULL, 0, &ip_mtu, 0,
                   1677:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1678:                       IPCTL_DEFMTU, CTL_EOL);
                   1679: #endif /* IPCTL_DEFMTU */
1.197     atatat   1680:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1681:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1682:                       CTLTYPE_INT, "forwsrcrt",
                   1683:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1684:                                    "datagrams"),
1.228     elad     1685:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1686:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1687:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1688:        sysctl_createv(clog, 0, NULL, NULL,
                   1689:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1690:                       CTLTYPE_INT, "directed-broadcast",
                   1691:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1692:                       NULL, 0, &ip_directedbcast, 0,
                   1693:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1694:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1695:        sysctl_createv(clog, 0, NULL, NULL,
                   1696:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1697:                       CTLTYPE_INT, "allowsrcrt",
                   1698:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1699:                       NULL, 0, &ip_allowsrcrt, 0,
                   1700:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1701:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1702:
1.197     atatat   1703:        sysctl_createv(clog, 0, NULL, NULL,
                   1704:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1705:                       CTLTYPE_INT, "mtudisc",
                   1706:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1707:                       NULL, 0, &ip_mtudisc, 0,
                   1708:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1709:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1710:        sysctl_createv(clog, 0, NULL, NULL,
                   1711:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1712:                       CTLTYPE_INT, "anonportmin",
                   1713:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1714:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1715:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1716:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1717:        sysctl_createv(clog, 0, NULL, NULL,
                   1718:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1719:                       CTLTYPE_INT, "anonportmax",
                   1720:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1721:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1722:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1723:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1724:        sysctl_createv(clog, 0, NULL, NULL,
                   1725:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1726:                       CTLTYPE_INT, "mtudisctimeout",
                   1727:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1728:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1729:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1730:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1731: #ifndef IPNOPRIVPORTS
1.197     atatat   1732:        sysctl_createv(clog, 0, NULL, NULL,
                   1733:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1734:                       CTLTYPE_INT, "lowportmin",
                   1735:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1736:                                    "to assign"),
1.189     atatat   1737:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1738:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1739:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1740:        sysctl_createv(clog, 0, NULL, NULL,
                   1741:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1742:                       CTLTYPE_INT, "lowportmax",
                   1743:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1744:                                    "to assign"),
1.189     atatat   1745:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1746:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1747:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1748: #endif /* IPNOPRIVPORTS */
                   1749: #if NGRE > 0
1.197     atatat   1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1752:                       CTLTYPE_INT, "grettl",
                   1753:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1754:                       NULL, 0, &ip_gre_ttl, 0,
                   1755:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1756:                       IPCTL_GRE_TTL, CTL_EOL);
                   1757: #endif /* NGRE */
1.197     atatat   1758:        sysctl_createv(clog, 0, NULL, NULL,
                   1759:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1760:                       CTLTYPE_INT, "checkinterface",
                   1761:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1762:                                    "from RFC1122"),
1.189     atatat   1763:                       NULL, 0, &ip_checkinterface, 0,
                   1764:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1765:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1766:        sysctl_createv(clog, 0, NULL, NULL,
                   1767:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1768:                       CTLTYPE_INT, "random_id",
                   1769:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1770:                       NULL, 0, &ip_do_randomid, 0,
                   1771:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1772:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1773:        sysctl_createv(clog, 0, NULL, NULL,
                   1774:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1775:                       CTLTYPE_INT, "do_loopback_cksum",
                   1776:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1777:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1778:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1779:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1780:        sysctl_createv(clog, 0, NULL, NULL,
                   1781:                       CTLFLAG_PERMANENT,
                   1782:                       CTLTYPE_STRUCT, "stats",
                   1783:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1784:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1785:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1786:                       CTL_EOL);
1.319.4.2  skrll    1787: #if NARP
                   1788:        sysctl_createv(clog, 0, NULL, NULL,
                   1789:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1790:                       CTLTYPE_INT, "dad_count",
                   1791:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1792:                                    "probes to send"),
                   1793:                       NULL, 0, &ip_dad_count, 0,
                   1794:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1795:                       IPCTL_DAD_COUNT, CTL_EOL);
                   1796: #endif
1.301     christos 1797:
                   1798:        /* anonportalgo RFC6056 subtree */
1.302     christos 1799:        const struct sysctlnode *portalgo_node;
                   1800:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1801:                       CTLFLAG_PERMANENT,
                   1802:                       CTLTYPE_NODE, "anonportalgo",
                   1803:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1804:                       NULL, 0, NULL, 0,
                   1805:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1806:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1807:                       CTLFLAG_PERMANENT,
                   1808:                       CTLTYPE_STRING, "available",
                   1809:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1810:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1811:                       CTL_CREATE, CTL_EOL);
1.302     christos 1812:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1813:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1814:                       CTLTYPE_STRING, "selected",
                   1815:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1816:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1817:                       CTL_CREATE, CTL_EOL);
                   1818:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1819:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1820:                       CTLTYPE_STRUCT, "reserve",
                   1821:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1822:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1823:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1824: }
1.266     thorpej  1825:
                   1826: void
                   1827: ip_statinc(u_int stat)
                   1828: {
                   1829:
                   1830:        KASSERT(stat < IP_NSTATS);
                   1831:        IP_STATINC(stat);
                   1832: }

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