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Annotation of src/sys/netinet/ip_input.c, Revision 1.327

1.327   ! riastrad    1: /*     $NetBSD: ip_input.c,v 1.326 2016/01/08 03:55:39 knakahara 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>
1.327   ! riastrad   94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.326 2016/01/08 03:55:39 knakahara Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.278     christos   98: #include "opt_compat_netbsd.h"
1.62      matt       99: #include "opt_gateway.h"
1.91      thorpej   100: #include "opt_ipsec.h"
1.55      scottr    101: #include "opt_mrouting.h"
1.167     martin    102: #include "opt_mbuftrace.h"
1.135     thorpej   103: #include "opt_inet_csum.h"
1.324     pooka     104: #endif
1.1       cgd       105:
1.325     roy       106: #include "arp.h"
                    107:
1.5       mycroft   108: #include <sys/param.h>
                    109: #include <sys/systm.h>
1.318     rmind     110: #include <sys/cpu.h>
1.5       mycroft   111: #include <sys/mbuf.h>
                    112: #include <sys/domain.h>
                    113: #include <sys/protosw.h>
                    114: #include <sys/socket.h>
1.44      thorpej   115: #include <sys/socketvar.h>
1.5       mycroft   116: #include <sys/errno.h>
                    117: #include <sys/time.h>
                    118: #include <sys/kernel.h>
1.72      thorpej   119: #include <sys/pool.h>
1.28      christos  120: #include <sys/sysctl.h>
1.230     elad      121: #include <sys/kauth.h>
1.1       cgd       122:
1.5       mycroft   123: #include <net/if.h>
1.44      thorpej   124: #include <net/if_dl.h>
1.5       mycroft   125: #include <net/route.h>
1.318     rmind     126: #include <net/pktqueue.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
1.215     yamt      133: #include <netinet/in_proto.h>
1.5       mycroft   134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
1.266     thorpej   136: #include <netinet/ip_private.h>
1.5       mycroft   137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
1.144     martin    141: #include <net/if_gre.h>
                    142: #include "gre.h"
1.111     jdolecek  143:
                    144: #ifdef MROUTING
                    145: #include <netinet/ip_mroute.h>
                    146: #endif
1.302     christos  147: #include <netinet/portalgo.h>
1.89      itojun    148:
1.304     christos  149: #ifdef IPSEC
1.173     jonathan  150: #include <netipsec/ipsec.h>
1.305     rmind     151: #endif
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
                    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:
1.278     christos  176: #ifdef COMPAT_50
                    177: #include <compat/sys/time.h>
                    178: #include <compat/sys/socket.h>
                    179: #endif
                    180:
1.27      thorpej   181: /*
                    182:  * Note: DIRECTED_BROADCAST is handled this way so that previous
                    183:  * configuration using this option will Just Work.
                    184:  */
                    185: #ifndef IPDIRECTEDBCAST
                    186: #ifdef DIRECTED_BROADCAST
                    187: #define IPDIRECTEDBCAST        1
                    188: #else
                    189: #define        IPDIRECTEDBCAST 0
                    190: #endif /* DIRECTED_BROADCAST */
                    191: #endif /* IPDIRECTEDBCAST */
1.1       cgd       192: int    ipforwarding = IPFORWARDING;
                    193: int    ipsendredirects = IPSENDREDIRECTS;
1.13      mycroft   194: int    ip_defttl = IPDEFTTL;
1.26      thorpej   195: int    ip_forwsrcrt = IPFORWSRCRT;
1.27      thorpej   196: int    ip_directedbcast = IPDIRECTEDBCAST;
1.47      cjs       197: int    ip_allowsrcrt = IPALLOWSRCRT;
1.53      kml       198: int    ip_mtudisc = IPMTUDISC;
1.156     itojun    199: int    ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1       cgd       200: #ifdef DIAGNOSTIC
                    201: int    ipprintfs = 0;
                    202: #endif
1.184     jonathan  203:
                    204: int    ip_do_randomid = 0;
                    205:
1.165     christos  206: /*
                    207:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    208:  * the Strong ES model described in RFC 1122, but since the routing table
                    209:  * and transmit implementation do not implement the Strong ES model,
                    210:  * setting this to 1 results in an odd hybrid.
                    211:  *
                    212:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    213:  * to translate the destination address to another local interface.
                    214:  *
                    215:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    216:  * to the loopback interface instead of the interface where the
                    217:  * packets for those addresses are received.
                    218:  */
1.318     rmind     219: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  220:
1.60      kml       221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    222:
1.318     rmind     223: pktqueue_t *           ip_pktq                 __read_mostly;
                    224: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    225: ipid_state_t *         ip_ids                  __read_mostly;
                    226: percpu_t *             ipstat_percpu           __read_mostly;
                    227:
                    228: static struct route    ipforward_rt            __cacheline_aligned;
1.286     tls       229:
1.183     jonathan  230: uint16_t ip_id;
1.75      thorpej   231:
1.135     thorpej   232: #ifdef INET_CSUM_COUNTERS
                    233: #include <sys/device.h>
                    234:
                    235: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    236:     NULL, "inet", "hwcsum bad");
                    237: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    238:     NULL, "inet", "hwcsum ok");
                    239: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    240:     NULL, "inet", "swcsum");
                    241:
                    242: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    243:
1.201     matt      244: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    245: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    246: EVCNT_ATTACH_STATIC(ip_swcsum);
                    247:
1.135     thorpej   248: #else
                    249:
                    250: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    251:
                    252: #endif /* INET_CSUM_COUNTERS */
                    253:
1.1       cgd       254: /*
                    255:  * We need to save the IP options in case a protocol wants to respond
                    256:  * to an incoming packet over the same route if the packet got here
                    257:  * using IP source routing.  This allows connection establishment and
                    258:  * maintenance when the remote end is on a network that is not known
                    259:  * to us.
                    260:  */
1.311     rmind     261:
                    262: static int     ip_nhops = 0;
                    263:
1.1       cgd       264: static struct ip_srcrt {
                    265:        struct  in_addr dst;                    /* final destination */
                    266:        char    nop;                            /* one NOP to align */
                    267:        char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */
                    268:        struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    269: } ip_srcrt;
                    270:
1.295     dyoung    271: static int ip_drainwanted;
                    272:
1.318     rmind     273: struct sockaddr_in ipaddr = {
                    274:        .sin_len = sizeof(ipaddr),
                    275:        .sin_family = AF_INET,
                    276: };
                    277:
1.210     perry     278: static void save_rte(u_char *, struct in_addr);
1.35      mycroft   279:
1.164     matt      280: #ifdef MBUFTRACE
1.234     dogcow    281: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    282: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      283: #endif
                    284:
1.318     rmind     285: static void            ipintr(void *);
1.312     rmind     286: static void            ip_input(struct mbuf *);
1.313     rmind     287: static void            ip_forward(struct mbuf *, int);
1.311     rmind     288: static bool            ip_dooptions(struct mbuf *);
                    289: static struct in_ifaddr *ip_rtaddr(struct in_addr);
                    290: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     291:
1.318     rmind     292: /* XXX: Not yet enabled. */
                    293: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    294: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
                    295:
1.1       cgd       296: /*
                    297:  * IP initialization: fill in IP protocol switch table.
                    298:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    299:  */
1.8       mycroft   300: void
1.211     perry     301: ip_init(void)
1.1       cgd       302: {
1.199     matt      303:        const struct protosw *pr;
1.327   ! riastrad  304:        const struct ipprotosw *ippr;
        !           305:        size_t i;
1.1       cgd       306:
1.311     rmind     307:        in_init();
1.284     pooka     308:        sysctl_net_inet_ip_setup(NULL);
                    309:
1.327   ! riastrad  310:        for (i = 0; i < inetdomain.dom_nprotosw; i++) {
        !           311:                inetdomain.dom_protosw[i] = &inetsw[i].ippr_protosw;
        !           312:        }
        !           313:
1.311     rmind     314:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    315:        KASSERT(pr != NULL);
1.327   ! riastrad  316:        ippr = container_of(pr, struct ipprotosw, ippr_protosw);
1.275     pooka     317:
1.319     ozaki-r   318:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     319:        KASSERT(ip_pktq != NULL);
                    320:
1.327   ! riastrad  321:        for (i = 0; i < IPPROTO_MAX; i++) {
        !           322:                ip_protox[i] = ippr - inetsw;
1.311     rmind     323:        }
1.327   ! riastrad  324:        for (i = 0; i < inetdomain.dom_nprotosw; i++) {
        !           325:                pr = inetdomain.dom_protosw[i];
        !           326:                ippr = container_of(pr, struct ipprotosw, ippr_protosw);
1.1       cgd       327:                if (pr->pr_domain->dom_family == PF_INET &&
                    328:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.327   ! riastrad  329:                        ip_protox[pr->pr_protocol] = ippr - inetsw;
        !           330:        }
1.192     jonathan  331:
1.288     rmind     332:        ip_reass_init();
1.190     jonathan  333:
1.291     rmind     334:        ip_ids = ip_id_init();
1.323     ozaki-r   335:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  336:
1.160     itojun    337:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73      thorpej   338: #ifdef GATEWAY
1.311     rmind     339:        ipflow_init();
1.73      thorpej   340: #endif
1.121     thorpej   341:
                    342:        /* Register our Packet Filter hook. */
1.308     rmind     343:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    344:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   345:
1.164     matt      346: #ifdef MBUFTRACE
                    347:        MOWNER_ATTACH(&ip_tx_mowner);
                    348:        MOWNER_ATTACH(&ip_rx_mowner);
                    349: #endif /* MBUFTRACE */
1.266     thorpej   350:
                    351:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1       cgd       352: }
                    353:
                    354: /*
1.318     rmind     355:  * IP software interrupt routine.
1.89      itojun    356:  */
1.318     rmind     357: static void
                    358: ipintr(void *arg __unused)
1.89      itojun    359: {
                    360:        struct mbuf *m;
1.286     tls       361:
1.318     rmind     362:        KASSERT(cpu_softintr_p());
1.89      itojun    363:
1.268     ad        364:        mutex_enter(softnet_lock);
1.318     rmind     365:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    366:                ip_input(m);
                    367:        }
1.268     ad        368:        mutex_exit(softnet_lock);
1.89      itojun    369: }
                    370:
                    371: /*
1.318     rmind     372:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       373:  * try to reassemble.  Process options.  Pass to next level.
                    374:  */
1.312     rmind     375: static void
1.89      itojun    376: ip_input(struct mbuf *m)
1.1       cgd       377: {
1.109     augustss  378:        struct ip *ip = NULL;
                    379:        struct in_ifaddr *ia;
                    380:        struct ifaddr *ifa;
1.288     rmind     381:        int hlen = 0, len;
1.100     itojun    382:        int downmatch;
1.165     christos  383:        int checkif;
1.169     itojun    384:        int srcrt = 0;
1.314     rmind     385:        ifnet_t *ifp;
1.1       cgd       386:
1.318     rmind     387:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    388:            "interrupt handler; synchronization assumptions violated");
                    389:
1.164     matt      390:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     391:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.314     rmind     392:        ifp = m->m_pkthdr.rcvif;
1.164     matt      393:
1.1       cgd       394:        /*
                    395:         * If no IP addresses have been set yet but the interfaces
                    396:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     397:         * Note: we pre-check without locks held.
1.1       cgd       398:         */
1.318     rmind     399:        if (!TAILQ_FIRST(&in_ifaddrhead)) {
1.1       cgd       400:                goto bad;
1.318     rmind     401:        }
1.266     thorpej   402:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     403:
1.154     thorpej   404:        /*
                    405:         * If the IP header is not aligned, slurp it up into a new
                    406:         * mbuf with space for link headers, in the event we forward
                    407:         * it.  Otherwise, if it is aligned, make sure the entire
                    408:         * base IP header is in the first mbuf of the chain.
                    409:         */
1.244     christos  410:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   411:                if ((m = m_copyup(m, sizeof(struct ip),
                    412:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    413:                        /* XXXJRT new stat, please */
1.266     thorpej   414:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   415:                        return;
                    416:                }
                    417:        } else if (__predict_false(m->m_len < sizeof (struct ip))) {
                    418:                if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266     thorpej   419:                        IP_STATINC(IP_STAT_TOOSMALL);
1.154     thorpej   420:                        return;
                    421:                }
1.1       cgd       422:        }
                    423:        ip = mtod(m, struct ip *);
1.13      mycroft   424:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   425:                IP_STATINC(IP_STAT_BADVERS);
1.13      mycroft   426:                goto bad;
                    427:        }
1.1       cgd       428:        hlen = ip->ip_hl << 2;
                    429:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   430:                IP_STATINC(IP_STAT_BADHLEN);
1.1       cgd       431:                goto bad;
                    432:        }
                    433:        if (hlen > m->m_len) {
1.298     liamjfoy  434:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   435:                        IP_STATINC(IP_STAT_BADHLEN);
1.89      itojun    436:                        return;
1.1       cgd       437:                }
                    438:                ip = mtod(m, struct ip *);
                    439:        }
1.98      thorpej   440:
1.85      hwr       441:        /*
1.99      thorpej   442:         * RFC1122: packets with a multicast source address are
1.98      thorpej   443:         * not allowed.
1.85      hwr       444:         */
                    445:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   446:                IP_STATINC(IP_STAT_BADADDR);
1.85      hwr       447:                goto bad;
1.129     itojun    448:        }
                    449:
                    450:        /* 127/8 must not appear on wire - RFC1122 */
                    451:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    452:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     453:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   454:                        IP_STATINC(IP_STAT_BADADDR);
1.129     itojun    455:                        goto bad;
1.130     itojun    456:                }
1.85      hwr       457:        }
                    458:
1.135     thorpej   459:        switch (m->m_pkthdr.csum_flags &
1.314     rmind     460:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135     thorpej   461:                 M_CSUM_IPv4_BAD)) {
                    462:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    463:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
                    464:                goto badcsum;
                    465:
                    466:        case M_CSUM_IPv4:
                    467:                /* Checksum was okay. */
                    468:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    469:                break;
                    470:
                    471:        default:
1.206     thorpej   472:                /*
                    473:                 * Must compute it ourselves.  Maybe skip checksum on
                    474:                 * loopback interfaces.
                    475:                 */
1.314     rmind     476:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    477:                    ip_do_loopback_cksum)) {
1.206     thorpej   478:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
                    479:                        if (in_cksum(m, hlen) != 0)
                    480:                                goto badcsum;
                    481:                }
1.135     thorpej   482:                break;
1.1       cgd       483:        }
                    484:
1.121     thorpej   485:        /* Retrieve the packet length. */
                    486:        len = ntohs(ip->ip_len);
1.81      proff     487:
                    488:        /*
                    489:         * Check for additional length bogosity
                    490:         */
1.84      proff     491:        if (len < hlen) {
1.266     thorpej   492:                IP_STATINC(IP_STAT_BADLEN);
1.81      proff     493:                goto bad;
                    494:        }
1.1       cgd       495:
                    496:        /*
                    497:         * Check that the amount of data in the buffers
                    498:         * is as at least much as the IP header would have us expect.
                    499:         * Trim mbufs if longer than we expect.
                    500:         * Drop packet if shorter than we expect.
                    501:         */
1.35      mycroft   502:        if (m->m_pkthdr.len < len) {
1.266     thorpej   503:                IP_STATINC(IP_STAT_TOOSHORT);
1.1       cgd       504:                goto bad;
                    505:        }
1.35      mycroft   506:        if (m->m_pkthdr.len > len) {
1.1       cgd       507:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   508:                        m->m_len = len;
                    509:                        m->m_pkthdr.len = len;
1.1       cgd       510:                } else
1.35      mycroft   511:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       512:        }
                    513:
1.64      thorpej   514:        /*
                    515:         * Assume that we can create a fast-forward IP flow entry
                    516:         * based on this packet.
                    517:         */
                    518:        m->m_flags |= M_CANFASTFWD;
                    519:
1.33      mrg       520:        /*
1.64      thorpej   521:         * Run through list of hooks for input packets.  If there are any
                    522:         * filters which require that additional packets in the flow are
                    523:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    524:         * Note that filters must _never_ set this flag, as another filter
                    525:         * in the list may have previously cleared it.
1.33      mrg       526:         */
1.304     christos  527: #if defined(IPSEC)
1.317     christos  528:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    529: #else
                    530:        if (1)
                    531: #endif
                    532:        {
1.314     rmind     533:                struct in_addr odst = ip->ip_dst;
1.318     rmind     534:                bool freed;
1.169     itojun    535:
1.318     rmind     536:                SOFTNET_LOCK();
                    537:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    538:                SOFTNET_UNLOCK();
                    539:                if (freed || m == NULL) {
1.127     itojun    540:                        return;
1.318     rmind     541:                }
1.127     itojun    542:                ip = mtod(m, struct ip *);
1.142     darrenr   543:                hlen = ip->ip_hl << 2;
1.318     rmind     544:
1.205     darrenr   545:                /*
                    546:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    547:                 * from generating ICMP redirects for packets that have
                    548:                 * been redirected by a hook back out on to the same LAN that
                    549:                 * they came from and is not an indication that the packet
                    550:                 * is being inffluenced by source routing options.  This
                    551:                 * allows things like
                    552:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    553:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    554:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    555:                 * also requires a "map tlp0 ..." to complete the story.
                    556:                 * One might argue whether or not this kind of network config.
1.212     perry     557:                 * should be supported in this manner...
1.205     darrenr   558:                 */
1.169     itojun    559:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    560:        }
1.123     thorpej   561:
                    562: #ifdef ALTQ
                    563:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     564:        if (altq_input) {
                    565:                SOFTNET_LOCK();
                    566:                if ((*altq_input)(m, AF_INET) == 0) {
                    567:                        /* Packet dropped by traffic conditioner. */
                    568:                        SOFTNET_UNLOCK();
                    569:                        return;
                    570:                }
                    571:                SOFTNET_UNLOCK();
1.123     thorpej   572:        }
                    573: #endif
1.121     thorpej   574:
                    575:        /*
1.1       cgd       576:         * Process options and, if not destined for us,
                    577:         * ship it on.  ip_dooptions returns 1 when an
                    578:         * error was detected (causing an icmp message
                    579:         * to be sent and the original packet to be freed).
                    580:         */
                    581:        ip_nhops = 0;           /* for source routed packets */
                    582:        if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89      itojun    583:                return;
1.1       cgd       584:
                    585:        /*
1.165     christos  586:         * Enable a consistency check between the destination address
                    587:         * and the arrival interface for a unicast packet (the RFC 1122
                    588:         * strong ES model) if IP forwarding is disabled and the packet
                    589:         * is not locally generated.
                    590:         *
                    591:         * XXX - Checking also should be disabled if the destination
                    592:         * address is ipnat'ed to a different interface.
                    593:         *
                    594:         * XXX - Checking is incompatible with IP aliases added
                    595:         * to the loopback interface instead of the interface where
                    596:         * the packets are received.
                    597:         *
                    598:         * XXX - We need to add a per ifaddr flag for this so that
                    599:         * we get finer grain control.
                    600:         */
                    601:        checkif = ip_checkinterface && (ipforwarding == 0) &&
1.315     christos  602:            (ifp->if_flags & IFF_LOOPBACK) == 0;
1.165     christos  603:
                    604:        /*
1.1       cgd       605:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    606:         *
                    607:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    608:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       609:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       610:         */
1.100     itojun    611:        downmatch = 0;
1.140     matt      612:        LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97      itojun    613:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.321     roy       614:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    615:                                continue;
1.314     rmind     616:                        if (checkif && ia->ia_ifp != ifp)
1.165     christos  617:                                continue;
1.97      itojun    618:                        if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
                    619:                                break;
1.100     itojun    620:                        else
                    621:                                downmatch++;
1.97      itojun    622:                }
                    623:        }
1.86      thorpej   624:        if (ia != NULL)
                    625:                goto ours;
1.315     christos  626:        if (ifp->if_flags & IFF_BROADCAST) {
1.314     rmind     627:                IFADDR_FOREACH(ifa, ifp) {
1.140     matt      628:                        if (ifa->ifa_addr->sa_family != AF_INET)
                    629:                                continue;
1.57      tls       630:                        ia = ifatoia(ifa);
1.321     roy       631:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    632:                                continue;
1.35      mycroft   633:                        if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    634:                            in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20      mycroft   635:                            /*
                    636:                             * Look for all-0's host part (old broadcast addr),
                    637:                             * either for subnet or net.
                    638:                             */
                    639:                            ip->ip_dst.s_addr == ia->ia_subnet ||
1.18      mycroft   640:                            ip->ip_dst.s_addr == ia->ia_net)
1.1       cgd       641:                                goto ours;
1.57      tls       642:                        /*
                    643:                         * An interface with IP address zero accepts
                    644:                         * all packets that arrive on that interface.
                    645:                         */
                    646:                        if (in_nullhost(ia->ia_addr.sin_addr))
                    647:                                goto ours;
1.1       cgd       648:                }
                    649:        }
1.18      mycroft   650:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   651: #ifdef MROUTING
                    652:                extern struct socket *ip_mrouter;
1.10      brezak    653:
1.4       hpeyerl   654:                if (ip_mrouter) {
                    655:                        /*
                    656:                         * If we are acting as a multicast router, all
                    657:                         * incoming multicast packets are passed to the
                    658:                         * kernel-level multicast forwarding function.
                    659:                         * The packet is returned (relatively) intact; if
                    660:                         * ip_mforward() returns a non-zero value, the packet
                    661:                         * must be discarded, else it may be accepted below.
                    662:                         *
                    663:                         * (The IP ident field is put in the same byte order
                    664:                         * as expected when ip_mforward() is called from
                    665:                         * ip_output().)
                    666:                         */
1.318     rmind     667:                        SOFTNET_LOCK();
1.314     rmind     668:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     669:                                SOFTNET_UNLOCK();
1.266     thorpej   670:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   671:                                m_freem(m);
1.89      itojun    672:                                return;
1.4       hpeyerl   673:                        }
1.318     rmind     674:                        SOFTNET_UNLOCK();
1.4       hpeyerl   675:
                    676:                        /*
                    677:                         * The process-level routing demon needs to receive
                    678:                         * all multicast IGMP packets, whether or not this
                    679:                         * host belongs to their destination groups.
                    680:                         */
1.318     rmind     681:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   682:                                goto ours;
1.318     rmind     683:                        }
1.266     thorpej   684:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   685:                }
                    686: #endif
                    687:                /*
                    688:                 * See if we belong to the destination multicast group on the
                    689:                 * arrival interface.
                    690:                 */
1.316     rmind     691:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   692:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   693:                        m_freem(m);
1.89      itojun    694:                        return;
1.4       hpeyerl   695:                }
                    696:                goto ours;
                    697:        }
1.19      mycroft   698:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   699:            in_nullhost(ip->ip_dst))
1.1       cgd       700:                goto ours;
                    701:
                    702:        /*
                    703:         * Not for us; forward if possible and desirable.
                    704:         */
                    705:        if (ipforwarding == 0) {
1.266     thorpej   706:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       707:                m_freem(m);
1.100     itojun    708:        } else {
                    709:                /*
                    710:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    711:                 * and there's no IFF_UP interface that matches ip_dst,
                    712:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    713:                 * forwarding loop till TTL goes to 0.
                    714:                 */
                    715:                if (downmatch) {
                    716:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   717:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    718:                        return;
                    719:                }
1.304     christos  720: #ifdef IPSEC
1.305     rmind     721:                /* Perform IPsec, if any. */
1.318     rmind     722:                if (ipsec_used) {
                    723:                        SOFTNET_LOCK();
                    724:                        if (ipsec4_input(m, IP_FORWARDING |
                    725:                            (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
                    726:                                SOFTNET_UNLOCK();
                    727:                                goto bad;
                    728:                        }
                    729:                        SOFTNET_UNLOCK();
1.173     jonathan  730:                }
1.305     rmind     731: #endif
1.169     itojun    732:                ip_forward(m, srcrt);
1.100     itojun    733:        }
1.89      itojun    734:        return;
1.1       cgd       735:
                    736: ours:
                    737:        /*
                    738:         * If offset or IP_MF are set, must reassemble.
                    739:         */
1.155     itojun    740:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     741:                /*
                    742:                 * Pass to IP reassembly mechanism.
                    743:                 */
1.290     rmind     744:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     745:                        /* Failed; invalid fragment(s) or packet. */
1.288     rmind     746:                        goto bad;
1.16      cgd       747:                }
1.290     rmind     748:                if (m == NULL) {
1.289     rmind     749:                        /* More fragments should come; silently return. */
                    750:                        return;
                    751:                }
1.290     rmind     752:                /*
                    753:                 * Reassembly is done, we have the final packet.
                    754:                 * Updated cached data in local variable(s).
                    755:                 */
1.289     rmind     756:                ip = mtod(m, struct ip *);
                    757:                hlen = ip->ip_hl << 2;
1.79      mycroft   758:        }
1.128     itojun    759:
1.304     christos  760: #ifdef IPSEC
1.173     jonathan  761:        /*
1.305     rmind     762:         * Enforce IPsec policy checking if we are seeing last header.
                    763:         * Note that we do not visit this with protocols with PCB layer
                    764:         * code - like UDP/TCP/raw IP.
1.173     jonathan  765:         */
1.317     christos  766:        if (ipsec_used &&
1.327   ! riastrad  767:            ((inetsw[ip_protox[ip->ip_p]].ippr_protosw.pr_flags & PR_LASTHDR)
        !           768:                != 0)) {
1.318     rmind     769:                SOFTNET_LOCK();
1.305     rmind     770:                if (ipsec4_input(m, 0) != 0) {
1.318     rmind     771:                        SOFTNET_UNLOCK();
1.305     rmind     772:                        goto bad;
1.173     jonathan  773:                }
1.318     rmind     774:                SOFTNET_UNLOCK();
1.173     jonathan  775:        }
1.305     rmind     776: #endif
1.1       cgd       777:
                    778:        /*
                    779:         * Switch out to protocol's input routine.
                    780:         */
1.82      aidan     781: #if IFA_STATS
1.122     itojun    782:        if (ia && ip)
1.155     itojun    783:                ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82      aidan     784: #endif
1.266     thorpej   785:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    786:
1.318     rmind     787:        const int off = hlen, nh = ip->ip_p;
                    788:
                    789:        SOFTNET_LOCK();
1.327   ! riastrad  790:        (*inetsw[ip_protox[nh]].ippr_input)(m, off, nh);
1.318     rmind     791:        SOFTNET_UNLOCK();
1.89      itojun    792:        return;
1.1       cgd       793: bad:
                    794:        m_freem(m);
1.135     thorpej   795:        return;
                    796:
                    797: badcsum:
1.266     thorpej   798:        IP_STATINC(IP_STAT_BADSUM);
1.135     thorpej   799:        m_freem(m);
1.1       cgd       800: }
                    801:
                    802: /*
1.288     rmind     803:  * IP timer processing.
1.1       cgd       804:  */
1.8       mycroft   805: void
1.211     perry     806: ip_slowtimo(void)
1.1       cgd       807: {
1.268     ad        808:
                    809:        mutex_enter(softnet_lock);
                    810:        KERNEL_LOCK(1, NULL);
1.1       cgd       811:
1.288     rmind     812:        ip_reass_slowtimo();
1.268     ad        813:
                    814:        KERNEL_UNLOCK_ONE(NULL);
                    815:        mutex_exit(softnet_lock);
1.1       cgd       816: }
                    817:
                    818: /*
1.288     rmind     819:  * IP drain processing.
1.1       cgd       820:  */
1.8       mycroft   821: void
1.211     perry     822: ip_drain(void)
1.1       cgd       823: {
                    824:
1.268     ad        825:        KERNEL_LOCK(1, NULL);
1.288     rmind     826:        ip_reass_drain();
1.268     ad        827:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       828: }
                    829:
                    830: /*
1.311     rmind     831:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    832:  * it if bad options are encountered, or forwarding it if source-routed.
                    833:  *
                    834:  * => Returns true if packet has been forwarded/freed.
                    835:  * => Returns false if the packet should be processed further.
1.1       cgd       836:  */
1.311     rmind     837: static bool
1.211     perry     838: ip_dooptions(struct mbuf *m)
1.1       cgd       839: {
1.109     augustss  840:        struct ip *ip = mtod(m, struct ip *);
                    841:        u_char *cp, *cp0;
                    842:        struct ip_timestamp *ipt;
                    843:        struct in_ifaddr *ia;
1.1       cgd       844:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104     thorpej   845:        struct in_addr dst;
1.1       cgd       846:        n_time ntime;
                    847:
1.13      mycroft   848:        dst = ip->ip_dst;
1.1       cgd       849:        cp = (u_char *)(ip + 1);
                    850:        cnt = (ip->ip_hl << 2) - sizeof (struct ip);
                    851:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    852:                opt = cp[IPOPT_OPTVAL];
                    853:                if (opt == IPOPT_EOL)
                    854:                        break;
                    855:                if (opt == IPOPT_NOP)
                    856:                        optlen = 1;
                    857:                else {
1.113     itojun    858:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    859:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    860:                                goto bad;
                    861:                        }
1.1       cgd       862:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    863:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       864:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    865:                                goto bad;
                    866:                        }
                    867:                }
                    868:                switch (opt) {
                    869:
                    870:                default:
                    871:                        break;
                    872:
                    873:                /*
                    874:                 * Source routing with record.
                    875:                 * Find interface with current destination address.
                    876:                 * If none on this machine then drop if strictly routed,
                    877:                 * or do nothing if loosely routed.
                    878:                 * Record interface address and bring up next address
                    879:                 * component.  If strictly routed make sure next
                    880:                 * address is on directly accessible net.
                    881:                 */
                    882:                case IPOPT_LSRR:
                    883:                case IPOPT_SSRR:
1.47      cjs       884:                        if (ip_allowsrcrt == 0) {
                    885:                                type = ICMP_UNREACH;
                    886:                                code = ICMP_UNREACH_NET_PROHIB;
                    887:                                goto bad;
                    888:                        }
1.114     itojun    889:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    890:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    891:                                goto bad;
                    892:                        }
1.1       cgd       893:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    894:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    895:                                goto bad;
                    896:                        }
                    897:                        ipaddr.sin_addr = ip->ip_dst;
1.19      mycroft   898:                        ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1       cgd       899:                        if (ia == 0) {
                    900:                                if (opt == IPOPT_SSRR) {
                    901:                                        type = ICMP_UNREACH;
                    902:                                        code = ICMP_UNREACH_SRCFAIL;
                    903:                                        goto bad;
                    904:                                }
                    905:                                /*
                    906:                                 * Loose routing, and not at next destination
                    907:                                 * yet; nothing to do except forward.
                    908:                                 */
                    909:                                break;
                    910:                        }
                    911:                        off--;                  /* 0 origin */
1.112     sommerfe  912:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       913:                                /*
                    914:                                 * End of source route.  Should be for us.
                    915:                                 */
                    916:                                save_rte(cp, ip->ip_src);
                    917:                                break;
                    918:                        }
                    919:                        /*
                    920:                         * locate outgoing interface
                    921:                         */
1.281     tsutsui   922:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       923:                            sizeof(ipaddr.sin_addr));
1.96      thorpej   924:                        if (opt == IPOPT_SSRR)
1.196     itojun    925:                                ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96      thorpej   926:                        else
1.1       cgd       927:                                ia = ip_rtaddr(ipaddr.sin_addr);
                    928:                        if (ia == 0) {
                    929:                                type = ICMP_UNREACH;
                    930:                                code = ICMP_UNREACH_SRCFAIL;
                    931:                                goto bad;
                    932:                        }
                    933:                        ip->ip_dst = ipaddr.sin_addr;
1.244     christos  934:                        bcopy((void *)&ia->ia_addr.sin_addr,
                    935:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd       936:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   937:                        /*
                    938:                         * Let ip_intr's mcast routing check handle mcast pkts
                    939:                         */
1.18      mycroft   940:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       941:                        break;
                    942:
                    943:                case IPOPT_RR:
1.114     itojun    944:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    945:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    946:                                goto bad;
                    947:                        }
1.1       cgd       948:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    949:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    950:                                goto bad;
                    951:                        }
                    952:                        /*
                    953:                         * If no space remains, ignore.
                    954:                         */
                    955:                        off--;                  /* 0 origin */
1.112     sommerfe  956:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd       957:                                break;
1.281     tsutsui   958:                        memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1       cgd       959:                            sizeof(ipaddr.sin_addr));
                    960:                        /*
                    961:                         * locate outgoing interface; if we're the destination,
                    962:                         * use the incoming interface (should be same).
                    963:                         */
1.96      thorpej   964:                        if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
                    965:                            == NULL &&
                    966:                            (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1       cgd       967:                                type = ICMP_UNREACH;
                    968:                                code = ICMP_UNREACH_HOST;
                    969:                                goto bad;
                    970:                        }
1.244     christos  971:                        bcopy((void *)&ia->ia_addr.sin_addr,
                    972:                            (void *)(cp + off), sizeof(struct in_addr));
1.1       cgd       973:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                    974:                        break;
                    975:
                    976:                case IPOPT_TS:
                    977:                        code = cp - (u_char *)ip;
                    978:                        ipt = (struct ip_timestamp *)cp;
1.114     itojun    979:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                    980:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd       981:                                goto bad;
1.114     itojun    982:                        }
                    983:                        if (ipt->ipt_ptr < 5) {
                    984:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                    985:                                goto bad;
                    986:                        }
1.15      cgd       987:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114     itojun    988:                                if (++ipt->ipt_oflw == 0) {
                    989:                                        code = (u_char *)&ipt->ipt_ptr -
                    990:                                            (u_char *)ip;
1.1       cgd       991:                                        goto bad;
1.114     itojun    992:                                }
1.1       cgd       993:                                break;
                    994:                        }
1.104     thorpej   995:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd       996:                        switch (ipt->ipt_flg) {
                    997:
                    998:                        case IPOPT_TS_TSONLY:
                    999:                                break;
                   1000:
                   1001:                        case IPOPT_TS_TSANDADDR:
1.66      thorpej  1002:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1003:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1004:                                        code = (u_char *)&ipt->ipt_ptr -
                   1005:                                            (u_char *)ip;
1.1       cgd      1006:                                        goto bad;
1.114     itojun   1007:                                }
1.13      mycroft  1008:                                ipaddr.sin_addr = dst;
1.96      thorpej  1009:                                ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
                   1010:                                    m->m_pkthdr.rcvif));
1.13      mycroft  1011:                                if (ia == 0)
                   1012:                                        continue;
1.104     thorpej  1013:                                bcopy(&ia->ia_addr.sin_addr,
                   1014:                                    cp0, sizeof(struct in_addr));
1.1       cgd      1015:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1016:                                break;
                   1017:
                   1018:                        case IPOPT_TS_PRESPEC:
1.66      thorpej  1019:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1020:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1021:                                        code = (u_char *)&ipt->ipt_ptr -
                   1022:                                            (u_char *)ip;
1.1       cgd      1023:                                        goto bad;
1.114     itojun   1024:                                }
1.281     tsutsui  1025:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1026:                                    sizeof(struct in_addr));
1.96      thorpej  1027:                                if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
                   1028:                                    == NULL)
1.1       cgd      1029:                                        continue;
                   1030:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1031:                                break;
                   1032:
                   1033:                        default:
1.114     itojun   1034:                                /* XXX can't take &ipt->ipt_flg */
                   1035:                                code = (u_char *)&ipt->ipt_ptr -
                   1036:                                    (u_char *)ip + 1;
1.1       cgd      1037:                                goto bad;
                   1038:                        }
                   1039:                        ntime = iptime();
1.107     thorpej  1040:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1041:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1042:                            sizeof(n_time));
                   1043:                        ipt->ipt_ptr += sizeof(n_time);
                   1044:                }
                   1045:        }
                   1046:        if (forward) {
1.26      thorpej  1047:                if (ip_forwsrcrt == 0) {
                   1048:                        type = ICMP_UNREACH;
                   1049:                        code = ICMP_UNREACH_SRCFAIL;
                   1050:                        goto bad;
                   1051:                }
1.1       cgd      1052:                ip_forward(m, 1);
1.311     rmind    1053:                return true;
1.13      mycroft  1054:        }
1.311     rmind    1055:        return false;
1.1       cgd      1056: bad:
1.13      mycroft  1057:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1058:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1059:        return true;
1.1       cgd      1060: }
                   1061:
                   1062: /*
1.311     rmind    1063:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1064:  * return internet address info of interface to be used to get there.
                   1065:  */
1.311     rmind    1066: static struct in_ifaddr *
1.211     perry    1067: ip_rtaddr(struct in_addr dst)
1.1       cgd      1068: {
1.249     dyoung   1069:        struct rtentry *rt;
                   1070:        union {
                   1071:                struct sockaddr         dst;
                   1072:                struct sockaddr_in      dst4;
                   1073:        } u;
                   1074:
                   1075:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1076:
1.318     rmind    1077:        SOFTNET_LOCK();
                   1078:        rt = rtcache_lookup(&ipforward_rt, &u.dst);
                   1079:        SOFTNET_UNLOCK();
                   1080:        if (rt == NULL)
1.249     dyoung   1081:                return NULL;
                   1082:
                   1083:        return ifatoia(rt->rt_ifa);
1.1       cgd      1084: }
                   1085:
                   1086: /*
1.311     rmind    1087:  * save_rte: save incoming source route for use in replies, to be picked
                   1088:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1089:  */
1.311     rmind    1090: static void
1.211     perry    1091: save_rte(u_char *option, struct in_addr dst)
1.1       cgd      1092: {
                   1093:        unsigned olen;
                   1094:
                   1095:        olen = option[IPOPT_OLEN];
                   1096:        if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
                   1097:                return;
1.281     tsutsui  1098:        memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1       cgd      1099:        ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1100:        ip_srcrt.dst = dst;
                   1101: }
                   1102:
                   1103: /*
                   1104:  * Retrieve incoming source route for use in replies,
                   1105:  * in the same form used by setsockopt.
                   1106:  * The first hop is placed before the options, will be removed later.
                   1107:  */
                   1108: struct mbuf *
1.211     perry    1109: ip_srcroute(void)
1.1       cgd      1110: {
1.109     augustss 1111:        struct in_addr *p, *q;
                   1112:        struct mbuf *m;
1.1       cgd      1113:
                   1114:        if (ip_nhops == 0)
1.237     dyoung   1115:                return NULL;
1.1       cgd      1116:        m = m_get(M_DONTWAIT, MT_SOOPTS);
                   1117:        if (m == 0)
1.237     dyoung   1118:                return NULL;
1.1       cgd      1119:
1.164     matt     1120:        MCLAIM(m, &inetdomain.dom_mowner);
1.13      mycroft  1121: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1       cgd      1122:
                   1123:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
                   1124:        m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
                   1125:            OPTSIZ;
                   1126:
                   1127:        /*
                   1128:         * First save first hop for return route
                   1129:         */
                   1130:        p = &ip_srcrt.route[ip_nhops - 1];
                   1131:        *(mtod(m, struct in_addr *)) = *p--;
                   1132:
                   1133:        /*
                   1134:         * Copy option fields and padding (nop) to mbuf.
                   1135:         */
                   1136:        ip_srcrt.nop = IPOPT_NOP;
                   1137:        ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244     christos 1138:        memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
                   1139:            OPTSIZ);
                   1140:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1141:            sizeof(struct in_addr) + OPTSIZ);
                   1142: #undef OPTSIZ
                   1143:        /*
                   1144:         * Record return path as an IP source route,
                   1145:         * reversing the path (pointers are now aligned).
                   1146:         */
                   1147:        while (p >= ip_srcrt.route) {
                   1148:                *q++ = *p--;
                   1149:        }
                   1150:        /*
                   1151:         * Last hop goes to final destination.
                   1152:         */
                   1153:        *q = ip_srcrt.dst;
                   1154:        return (m);
                   1155: }
                   1156:
1.139     matt     1157: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1158:        [PRC_MSGSIZE] = EMSGSIZE,
                   1159:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1160:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1161:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1162:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1163:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1164:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1165:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1166:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1167: };
                   1168:
1.295     dyoung   1169: void
                   1170: ip_fasttimo(void)
                   1171: {
                   1172:        if (ip_drainwanted) {
                   1173:                ip_drain();
                   1174:                ip_drainwanted = 0;
                   1175:        }
                   1176: }
                   1177:
                   1178: void
                   1179: ip_drainstub(void)
                   1180: {
                   1181:        ip_drainwanted = 1;
                   1182: }
                   1183:
1.1       cgd      1184: /*
                   1185:  * Forward a packet.  If some error occurs return the sender
                   1186:  * an icmp packet.  Note we can't always generate a meaningful
                   1187:  * icmp message because icmp doesn't have a large enough repertoire
                   1188:  * of codes and types.
                   1189:  *
                   1190:  * If not forwarding, just drop the packet.  This could be confusing
                   1191:  * if ipforwarding was zero but some routing protocol was advancing
                   1192:  * us as a gateway to somewhere.  However, we must let the routing
                   1193:  * protocol deal with that.
                   1194:  *
                   1195:  * The srcrt parameter indicates whether the packet is being forwarded
                   1196:  * via a source route.
                   1197:  */
1.313     rmind    1198: static void
1.211     perry    1199: ip_forward(struct mbuf *m, int srcrt)
1.1       cgd      1200: {
1.109     augustss 1201:        struct ip *ip = mtod(m, struct ip *);
                   1202:        struct rtentry *rt;
1.220     christos 1203:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1204:        struct mbuf *mcopy;
1.13      mycroft  1205:        n_long dest;
1.249     dyoung   1206:        union {
                   1207:                struct sockaddr         dst;
                   1208:                struct sockaddr_in      dst4;
                   1209:        } u;
1.320     ozaki-r  1210:        uint64_t *ips;
1.164     matt     1211:
1.318     rmind    1212:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1213:            "interrupt handler; synchronization assumptions violated");
                   1214:
1.164     matt     1215:        /*
                   1216:         * We are now in the output path.
                   1217:         */
                   1218:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1219:
                   1220:        /*
                   1221:         * Clear any in-bound checksum flags for this packet.
                   1222:         */
                   1223:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1224:
1.13      mycroft  1225:        dest = 0;
1.93      sommerfe 1226:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1227:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1228:                m_freem(m);
                   1229:                return;
                   1230:        }
1.318     rmind    1231:
                   1232:        SOFTNET_LOCK();
                   1233:
1.1       cgd      1234:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1235:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318     rmind    1236:                SOFTNET_UNLOCK();
1.1       cgd      1237:                return;
                   1238:        }
                   1239:
1.249     dyoung   1240:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1241:
1.249     dyoung   1242:        if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
                   1243:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318     rmind    1244:                SOFTNET_UNLOCK();
1.249     dyoung   1245:                return;
1.1       cgd      1246:        }
                   1247:
                   1248:        /*
1.34      mycroft  1249:         * Save at most 68 bytes of the packet in case
1.1       cgd      1250:         * we need to generate an ICMP message to the src.
1.119     itojun   1251:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1252:         */
1.155     itojun   1253:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1254:        if (mcopy)
                   1255:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1256:
1.221     christos 1257:        ip->ip_ttl -= IPTTLDEC;
                   1258:
1.1       cgd      1259:        /*
                   1260:         * If forwarding packet using same interface that it came in on,
                   1261:         * perhaps should send a redirect to sender to shortcut a hop.
                   1262:         * Only send redirect if source is sending directly to us,
                   1263:         * and if packet was not source routed (or has any options).
                   1264:         * Also, don't send redirect if forwarding using a default route
                   1265:         * or a route modified by a redirect.
                   1266:         */
                   1267:        if (rt->rt_ifp == m->m_pkthdr.rcvif &&
                   1268:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1269:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1270:            ipsendredirects && !srcrt) {
1.19      mycroft  1271:                if (rt->rt_ifa &&
                   1272:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1273:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1274:                        if (rt->rt_flags & RTF_GATEWAY)
                   1275:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1276:                        else
                   1277:                                dest = ip->ip_dst.s_addr;
                   1278:                        /*
                   1279:                         * Router requirements says to only send host
                   1280:                         * redirects.
                   1281:                         */
                   1282:                        type = ICMP_REDIRECT;
                   1283:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1284:                }
                   1285:        }
                   1286:
1.238     dyoung   1287:        error = ip_output(m, NULL, &ipforward_rt,
1.173     jonathan 1288:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1289:            NULL, NULL);
1.173     jonathan 1290:
1.320     ozaki-r  1291:        if (error) {
1.266     thorpej  1292:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1293:                goto error;
                   1294:        }
                   1295:
                   1296:        ips = IP_STAT_GETREF();
                   1297:        ips[IP_STAT_FORWARD]++;
                   1298:
                   1299:        if (type) {
                   1300:                ips[IP_STAT_REDIRECTSENT]++;
                   1301:                IP_STAT_PUTREF();
                   1302:                goto redirect;
                   1303:        }
                   1304:
                   1305:        IP_STAT_PUTREF();
                   1306:        if (mcopy) {
1.63      matt     1307: #ifdef GATEWAY
1.320     ozaki-r  1308:                if (mcopy->m_flags & M_CANFASTFWD)
                   1309:                        ipflow_create(&ipforward_rt, mcopy);
1.63      matt     1310: #endif
1.320     ozaki-r  1311:                m_freem(mcopy);
1.1       cgd      1312:        }
1.320     ozaki-r  1313:
                   1314:        SOFTNET_UNLOCK();
                   1315:        return;
                   1316:
                   1317: redirect:
                   1318: error:
1.318     rmind    1319:        if (mcopy == NULL) {
                   1320:                SOFTNET_UNLOCK();
1.1       cgd      1321:                return;
1.318     rmind    1322:        }
1.13      mycroft  1323:
1.1       cgd      1324:        switch (error) {
                   1325:
                   1326:        case 0:                         /* forwarded, but need redirect */
                   1327:                /* type, code set above */
                   1328:                break;
                   1329:
                   1330:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1331:        case EHOSTUNREACH:
                   1332:        case ENETDOWN:
                   1333:        case EHOSTDOWN:
                   1334:        default:
                   1335:                type = ICMP_UNREACH;
                   1336:                code = ICMP_UNREACH_HOST;
                   1337:                break;
                   1338:
                   1339:        case EMSGSIZE:
                   1340:                type = ICMP_UNREACH;
                   1341:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1342:
1.274     seanb    1343:                if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
                   1344:                        destmtu = rt->rt_ifp->if_mtu;
1.305     rmind    1345: #ifdef IPSEC
1.317     christos 1346:                if (ipsec_used)
                   1347:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1348: #endif
1.266     thorpej  1349:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1350:                break;
                   1351:
                   1352:        case ENOBUFS:
1.143     itojun   1353:                /*
1.311     rmind    1354:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1355:                 * Requirements for IP Version 4 Routers.  Source quench can
                   1356:                 * big problem under DoS attacks or if the underlying
                   1357:                 * interface is rate-limited.
1.143     itojun   1358:                 */
                   1359:                if (mcopy)
                   1360:                        m_freem(mcopy);
1.318     rmind    1361:                SOFTNET_UNLOCK();
1.143     itojun   1362:                return;
1.1       cgd      1363:        }
1.220     christos 1364:        icmp_error(mcopy, type, code, dest, destmtu);
1.318     rmind    1365:        SOFTNET_UNLOCK();
1.44      thorpej  1366: }
                   1367:
                   1368: void
1.211     perry    1369: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1370:     struct mbuf *m)
1.44      thorpej  1371: {
1.311     rmind    1372:        struct socket *so = inp->inp_socket;
1.314     rmind    1373:        ifnet_t *ifp = m->m_pkthdr.rcvif;
1.311     rmind    1374:        int inpflags = inp->inp_flags;
1.44      thorpej  1375:
1.311     rmind    1376:        if (so->so_options & SO_TIMESTAMP
1.278     christos 1377: #ifdef SO_OTIMESTAMP
1.311     rmind    1378:            || so->so_options & SO_OTIMESTAMP
1.278     christos 1379: #endif
                   1380:            ) {
1.44      thorpej  1381:                struct timeval tv;
                   1382:
                   1383:                microtime(&tv);
1.278     christos 1384: #ifdef SO_OTIMESTAMP
1.311     rmind    1385:                if (so->so_options & SO_OTIMESTAMP) {
1.278     christos 1386:                        struct timeval50 tv50;
                   1387:                        timeval_to_timeval50(&tv, &tv50);
                   1388:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1389:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1390:                } else
                   1391: #endif
1.244     christos 1392:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44      thorpej  1393:                    SCM_TIMESTAMP, SOL_SOCKET);
                   1394:                if (*mp)
                   1395:                        mp = &(*mp)->m_next;
                   1396:        }
1.311     rmind    1397:        if (inpflags & INP_RECVDSTADDR) {
1.244     christos 1398:                *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44      thorpej  1399:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1400:                if (*mp)
                   1401:                        mp = &(*mp)->m_next;
                   1402:        }
1.311     rmind    1403:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1404:                struct in_pktinfo ipi;
1.307     christos 1405:                ipi.ipi_addr = ip->ip_src;
1.314     rmind    1406:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1407:                *mp = sbcreatecontrol((void *) &ipi,
                   1408:                    sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
                   1409:                if (*mp)
                   1410:                        mp = &(*mp)->m_next;
                   1411:        }
1.311     rmind    1412:        if (inpflags & INP_PKTINFO) {
1.306     christos 1413:                struct in_pktinfo ipi;
1.307     christos 1414:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1415:                ipi.ipi_ifindex = ifp->if_index;
1.306     christos 1416:                *mp = sbcreatecontrol((void *) &ipi,
                   1417:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1418:                if (*mp)
                   1419:                        mp = &(*mp)->m_next;
                   1420:        }
1.311     rmind    1421:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1422:                struct sockaddr_dl sdl;
                   1423:
1.314     rmind    1424:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp ?
                   1425:                    ifp->if_index : 0, 0, NULL, 0, NULL, 0);
1.251     dyoung   1426:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1427:                if (*mp)
                   1428:                        mp = &(*mp)->m_next;
                   1429:        }
1.311     rmind    1430:        if (inpflags & INP_RECVTTL) {
1.282     minskim  1431:                *mp = sbcreatecontrol((void *) &ip->ip_ttl,
                   1432:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1433:                if (*mp)
                   1434:                        mp = &(*mp)->m_next;
                   1435:        }
1.13      mycroft  1436: }
                   1437:
1.189     atatat   1438: /*
1.228     elad     1439:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1440:  */
                   1441: static int
                   1442: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1443: {
                   1444:        int error, tmp;
                   1445:        struct sysctlnode node;
                   1446:
                   1447:        node = *rnode;
                   1448:        tmp = ip_forwsrcrt;
                   1449:        node.sysctl_data = &tmp;
                   1450:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1451:        if (error || newp == NULL)
                   1452:                return (error);
                   1453:
1.280     elad     1454:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1455:            0, NULL, NULL, NULL);
                   1456:        if (error)
                   1457:                return (error);
1.228     elad     1458:
                   1459:        ip_forwsrcrt = tmp;
                   1460:
                   1461:        return (0);
                   1462: }
                   1463:
                   1464: /*
1.189     atatat   1465:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1466:  * range of the new value and tweaks timers if it changes.
                   1467:  */
                   1468: static int
                   1469: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1470: {
1.189     atatat   1471:        int error, tmp;
                   1472:        struct sysctlnode node;
                   1473:
                   1474:        node = *rnode;
                   1475:        tmp = ip_mtudisc_timeout;
                   1476:        node.sysctl_data = &tmp;
                   1477:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1478:        if (error || newp == NULL)
                   1479:                return (error);
                   1480:        if (tmp < 0)
                   1481:                return (EINVAL);
1.52      thorpej  1482:
1.273     matt     1483:        mutex_enter(softnet_lock);
                   1484:
1.189     atatat   1485:        ip_mtudisc_timeout = tmp;
                   1486:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
                   1487:
1.273     matt     1488:        mutex_exit(softnet_lock);
                   1489:
1.189     atatat   1490:        return (0);
                   1491: }
1.54      lukem    1492:
1.266     thorpej  1493: static int
                   1494: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1495: {
                   1496:
1.271     thorpej  1497:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1498: }
1.131     itojun   1499:
1.284     pooka    1500: static void
                   1501: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1502: {
1.197     atatat   1503:        sysctl_createv(clog, 0, NULL, NULL,
                   1504:                       CTLFLAG_PERMANENT,
1.203     atatat   1505:                       CTLTYPE_NODE, "inet",
                   1506:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1507:                       NULL, 0, NULL, 0,
                   1508:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1509:        sysctl_createv(clog, 0, NULL, NULL,
                   1510:                       CTLFLAG_PERMANENT,
1.203     atatat   1511:                       CTLTYPE_NODE, "ip",
                   1512:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1513:                       NULL, 0, NULL, 0,
                   1514:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1515:
1.197     atatat   1516:        sysctl_createv(clog, 0, NULL, NULL,
                   1517:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1518:                       CTLTYPE_INT, "forwarding",
                   1519:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1520:                       NULL, 0, &ipforwarding, 0,
                   1521:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1522:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1523:        sysctl_createv(clog, 0, NULL, NULL,
                   1524:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1525:                       CTLTYPE_INT, "redirect",
                   1526:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1527:                       NULL, 0, &ipsendredirects, 0,
                   1528:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1529:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1530:        sysctl_createv(clog, 0, NULL, NULL,
                   1531:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1532:                       CTLTYPE_INT, "ttl",
                   1533:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1534:                       NULL, 0, &ip_defttl, 0,
                   1535:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1536:                       IPCTL_DEFTTL, CTL_EOL);
                   1537: #ifdef IPCTL_DEFMTU
1.197     atatat   1538:        sysctl_createv(clog, 0, NULL, NULL,
                   1539:                       CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203     atatat   1540:                       CTLTYPE_INT, "mtu",
                   1541:                       SYSCTL_DESCR("Default MTA for an INET route"),
1.189     atatat   1542:                       NULL, 0, &ip_mtu, 0,
                   1543:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1544:                       IPCTL_DEFMTU, CTL_EOL);
                   1545: #endif /* IPCTL_DEFMTU */
1.197     atatat   1546:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1547:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1548:                       CTLTYPE_INT, "forwsrcrt",
                   1549:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1550:                                    "datagrams"),
1.228     elad     1551:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1552:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1553:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1554:        sysctl_createv(clog, 0, NULL, NULL,
                   1555:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1556:                       CTLTYPE_INT, "directed-broadcast",
                   1557:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1558:                       NULL, 0, &ip_directedbcast, 0,
                   1559:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1560:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1561:        sysctl_createv(clog, 0, NULL, NULL,
                   1562:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1563:                       CTLTYPE_INT, "allowsrcrt",
                   1564:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1565:                       NULL, 0, &ip_allowsrcrt, 0,
                   1566:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1567:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1568:
1.197     atatat   1569:        sysctl_createv(clog, 0, NULL, NULL,
                   1570:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1571:                       CTLTYPE_INT, "mtudisc",
                   1572:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1573:                       NULL, 0, &ip_mtudisc, 0,
                   1574:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1575:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1576:        sysctl_createv(clog, 0, NULL, NULL,
                   1577:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1578:                       CTLTYPE_INT, "anonportmin",
                   1579:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1580:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1581:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1582:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1583:        sysctl_createv(clog, 0, NULL, NULL,
                   1584:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1585:                       CTLTYPE_INT, "anonportmax",
                   1586:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1587:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1588:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1589:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1590:        sysctl_createv(clog, 0, NULL, NULL,
                   1591:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1592:                       CTLTYPE_INT, "mtudisctimeout",
                   1593:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1594:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1595:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1596:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1597: #ifndef IPNOPRIVPORTS
1.197     atatat   1598:        sysctl_createv(clog, 0, NULL, NULL,
                   1599:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1600:                       CTLTYPE_INT, "lowportmin",
                   1601:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1602:                                    "to assign"),
1.189     atatat   1603:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1604:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1605:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1606:        sysctl_createv(clog, 0, NULL, NULL,
                   1607:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1608:                       CTLTYPE_INT, "lowportmax",
                   1609:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1610:                                    "to assign"),
1.189     atatat   1611:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1612:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1613:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1614: #endif /* IPNOPRIVPORTS */
                   1615: #if NGRE > 0
1.197     atatat   1616:        sysctl_createv(clog, 0, NULL, NULL,
                   1617:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1618:                       CTLTYPE_INT, "grettl",
                   1619:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1620:                       NULL, 0, &ip_gre_ttl, 0,
                   1621:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1622:                       IPCTL_GRE_TTL, CTL_EOL);
                   1623: #endif /* NGRE */
1.197     atatat   1624:        sysctl_createv(clog, 0, NULL, NULL,
                   1625:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1626:                       CTLTYPE_INT, "checkinterface",
                   1627:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1628:                                    "from RFC1122"),
1.189     atatat   1629:                       NULL, 0, &ip_checkinterface, 0,
                   1630:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1631:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1632:        sysctl_createv(clog, 0, NULL, NULL,
                   1633:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1634:                       CTLTYPE_INT, "random_id",
                   1635:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1636:                       NULL, 0, &ip_do_randomid, 0,
                   1637:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1638:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1639:        sysctl_createv(clog, 0, NULL, NULL,
                   1640:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1641:                       CTLTYPE_INT, "do_loopback_cksum",
                   1642:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1643:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1644:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1645:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1646:        sysctl_createv(clog, 0, NULL, NULL,
                   1647:                       CTLFLAG_PERMANENT,
                   1648:                       CTLTYPE_STRUCT, "stats",
                   1649:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1650:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1651:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1652:                       CTL_EOL);
1.322     joerg    1653: #if NARP
1.321     roy      1654:        sysctl_createv(clog, 0, NULL, NULL,
                   1655:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1656:                       CTLTYPE_INT, "dad_count",
                   1657:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1658:                                    "probes to send"),
                   1659:                       NULL, 0, &ip_dad_count, 0,
                   1660:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1661:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1662: #endif
1.301     christos 1663:
                   1664:        /* anonportalgo RFC6056 subtree */
1.302     christos 1665:        const struct sysctlnode *portalgo_node;
                   1666:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1667:                       CTLFLAG_PERMANENT,
                   1668:                       CTLTYPE_NODE, "anonportalgo",
                   1669:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1670:                       NULL, 0, NULL, 0,
                   1671:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1672:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1673:                       CTLFLAG_PERMANENT,
                   1674:                       CTLTYPE_STRING, "available",
                   1675:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1676:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1677:                       CTL_CREATE, CTL_EOL);
1.302     christos 1678:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1679:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1680:                       CTLTYPE_STRING, "selected",
                   1681:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1682:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1683:                       CTL_CREATE, CTL_EOL);
                   1684:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1685:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1686:                       CTLTYPE_STRUCT, "reserve",
                   1687:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1688:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1689:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1690: }
1.266     thorpej  1691:
                   1692: void
                   1693: ip_statinc(u_int stat)
                   1694: {
                   1695:
                   1696:        KASSERT(stat < IP_NSTATS);
                   1697:        IP_STATINC(stat);
                   1698: }

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