1986 lines
50 KiB
C
1986 lines
50 KiB
C
/* $FreeBSD$ */
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/* $KAME: nd6.c,v 1.68 2000/07/02 14:48:02 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* XXX
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* KAME 970409 note:
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* BSD/OS version heavily modifies this code, related to llinfo.
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* Since we don't have BSD/OS version of net/route.c in our hand,
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* I left the code mostly as it was in 970310. -- itojun
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_atm.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netinet/if_fddi.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/in6_prefix.h>
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#include <netinet/icmp6.h>
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#include <net/net_osdep.h>
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#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
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#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
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#define SIN6(s) ((struct sockaddr_in6 *)s)
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#define SDL(s) ((struct sockaddr_dl *)s)
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/* timer values */
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int nd6_prune = 1; /* walk list every 1 seconds */
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int nd6_delay = 5; /* delay first probe time 5 second */
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int nd6_umaxtries = 3; /* maximum unicast query */
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int nd6_mmaxtries = 3; /* maximum multicast query */
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int nd6_useloopback = 1; /* use loopback interface for local traffic */
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/* preventing too many loops in ND option parsing */
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int nd6_maxndopt = 10; /* max # of ND options allowed */
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int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
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/* for debugging? */
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static int nd6_inuse, nd6_allocated;
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struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6};
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static size_t nd_ifinfo_indexlim = 8;
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struct nd_ifinfo *nd_ifinfo = NULL;
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struct nd_drhead nd_defrouter;
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struct nd_prhead nd_prefix = { 0 };
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int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
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static struct sockaddr_in6 all1_sa;
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static void nd6_slowtimo __P((void *));
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void
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nd6_init()
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{
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static int nd6_init_done = 0;
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int i;
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if (nd6_init_done) {
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log(LOG_NOTICE, "nd6_init called more than once(ignored)\n");
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return;
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}
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all1_sa.sin6_family = AF_INET6;
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all1_sa.sin6_len = sizeof(struct sockaddr_in6);
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for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
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all1_sa.sin6_addr.s6_addr[i] = 0xff;
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/* initialization of the default router list */
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TAILQ_INIT(&nd_defrouter);
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nd6_init_done = 1;
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/* start timer */
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timeout(nd6_slowtimo, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz);
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}
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void
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nd6_ifattach(ifp)
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struct ifnet *ifp;
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{
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/*
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* We have some arrays that should be indexed by if_index.
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* since if_index will grow dynamically, they should grow too.
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*/
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if (nd_ifinfo == NULL || if_index >= nd_ifinfo_indexlim) {
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size_t n;
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caddr_t q;
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while (if_index >= nd_ifinfo_indexlim)
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nd_ifinfo_indexlim <<= 1;
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/* grow nd_ifinfo */
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n = nd_ifinfo_indexlim * sizeof(struct nd_ifinfo);
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q = (caddr_t)malloc(n, M_IP6NDP, M_WAITOK);
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bzero(q, n);
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if (nd_ifinfo) {
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bcopy((caddr_t)nd_ifinfo, q, n/2);
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free((caddr_t)nd_ifinfo, M_IP6NDP);
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}
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nd_ifinfo = (struct nd_ifinfo *)q;
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}
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#define ND nd_ifinfo[ifp->if_index]
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/* don't initialize if called twice */
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if (ND.linkmtu)
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return;
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ND.linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu;
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ND.chlim = IPV6_DEFHLIM;
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ND.basereachable = REACHABLE_TIME;
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ND.reachable = ND_COMPUTE_RTIME(ND.basereachable);
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ND.retrans = RETRANS_TIMER;
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ND.receivedra = 0;
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ND.flags = ND6_IFF_PERFORMNUD;
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nd6_setmtu(ifp);
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#undef ND
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}
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/*
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* Reset ND level link MTU. This function is called when the physical MTU
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* changes, which means we might have to adjust the ND level MTU.
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*/
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void
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nd6_setmtu(ifp)
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struct ifnet *ifp;
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{
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
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u_long oldmaxmtu = ndi->maxmtu;
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u_long oldlinkmtu = ndi->linkmtu;
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switch(ifp->if_type) {
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case IFT_ARCNET: /* XXX MTU handling needs more work */
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ndi->maxmtu = MIN(60480, ifp->if_mtu);
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break;
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case IFT_ETHER:
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ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
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break;
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case IFT_FDDI:
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ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu);
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break;
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case IFT_ATM:
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ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu);
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break;
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default:
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ndi->maxmtu = ifp->if_mtu;
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break;
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}
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if (oldmaxmtu != ndi->maxmtu) {
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/*
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* If the ND level MTU is not set yet, or if the maxmtu
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* is reset to a smaller value than the ND level MTU,
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* also reset the ND level MTU.
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*/
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if (ndi->linkmtu == 0 ||
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ndi->maxmtu < ndi->linkmtu) {
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ndi->linkmtu = ndi->maxmtu;
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/* also adjust in6_maxmtu if necessary. */
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if (oldlinkmtu == 0) {
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/*
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* XXX: the case analysis is grotty, but
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* it is not efficient to call in6_setmaxmtu()
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* here when we are during the initialization
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* procedure.
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*/
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if (in6_maxmtu < ndi->linkmtu)
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in6_maxmtu = ndi->linkmtu;
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} else
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in6_setmaxmtu();
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}
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}
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#undef MIN
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}
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void
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nd6_option_init(opt, icmp6len, ndopts)
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void *opt;
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int icmp6len;
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union nd_opts *ndopts;
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{
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bzero(ndopts, sizeof(*ndopts));
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ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
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ndopts->nd_opts_last
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= (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
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if (icmp6len == 0) {
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ndopts->nd_opts_done = 1;
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ndopts->nd_opts_search = NULL;
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}
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}
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/*
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* Take one ND option.
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*/
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struct nd_opt_hdr *
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nd6_option(ndopts)
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union nd_opts *ndopts;
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{
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struct nd_opt_hdr *nd_opt;
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int olen;
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if (!ndopts)
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panic("ndopts == NULL in nd6_option\n");
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if (!ndopts->nd_opts_last)
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panic("uninitialized ndopts in nd6_option\n");
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if (!ndopts->nd_opts_search)
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return NULL;
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if (ndopts->nd_opts_done)
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return NULL;
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nd_opt = ndopts->nd_opts_search;
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olen = nd_opt->nd_opt_len << 3;
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if (olen == 0) {
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/*
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* Message validation requires that all included
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* options have a length that is greater than zero.
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*/
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bzero(ndopts, sizeof(*ndopts));
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return NULL;
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}
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ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
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if (!(ndopts->nd_opts_search < ndopts->nd_opts_last)) {
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ndopts->nd_opts_done = 1;
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ndopts->nd_opts_search = NULL;
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}
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return nd_opt;
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}
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/*
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* Parse multiple ND options.
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* This function is much easier to use, for ND routines that do not need
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* multiple options of the same type.
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*/
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int
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nd6_options(ndopts)
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union nd_opts *ndopts;
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{
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struct nd_opt_hdr *nd_opt;
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int i = 0;
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if (!ndopts)
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panic("ndopts == NULL in nd6_options\n");
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if (!ndopts->nd_opts_last)
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panic("uninitialized ndopts in nd6_options\n");
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if (!ndopts->nd_opts_search)
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return 0;
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while (1) {
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nd_opt = nd6_option(ndopts);
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if (!nd_opt && !ndopts->nd_opts_last) {
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/*
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* Message validation requires that all included
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* options have a length that is greater than zero.
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*/
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bzero(ndopts, sizeof(*ndopts));
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return -1;
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}
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if (!nd_opt)
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goto skip1;
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switch (nd_opt->nd_opt_type) {
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case ND_OPT_SOURCE_LINKADDR:
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case ND_OPT_TARGET_LINKADDR:
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case ND_OPT_MTU:
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case ND_OPT_REDIRECTED_HEADER:
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if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
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printf("duplicated ND6 option found "
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"(type=%d)\n", nd_opt->nd_opt_type);
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/* XXX bark? */
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} else {
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ndopts->nd_opt_array[nd_opt->nd_opt_type]
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= nd_opt;
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}
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break;
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case ND_OPT_PREFIX_INFORMATION:
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if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
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ndopts->nd_opt_array[nd_opt->nd_opt_type]
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= nd_opt;
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}
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ndopts->nd_opts_pi_end =
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(struct nd_opt_prefix_info *)nd_opt;
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break;
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default:
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/*
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* Unknown options must be silently ignored,
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* to accomodate future extension to the protocol.
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*/
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log(LOG_DEBUG,
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"nd6_options: unsupported option %d - "
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"option ignored\n", nd_opt->nd_opt_type);
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}
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skip1:
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i++;
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if (i > nd6_maxndopt) {
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icmp6stat.icp6s_nd_toomanyopt++;
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printf("too many loop in nd opt\n");
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break;
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}
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if (ndopts->nd_opts_done)
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break;
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}
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return 0;
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}
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/*
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* ND6 timer routine to expire default route list and prefix list
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*/
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void
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nd6_timer(ignored_arg)
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void *ignored_arg;
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{
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int s;
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register struct llinfo_nd6 *ln;
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register struct nd_defrouter *dr;
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register struct nd_prefix *pr;
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s = splnet();
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timeout(nd6_timer, (caddr_t)0, nd6_prune * hz);
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ln = llinfo_nd6.ln_next;
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/* XXX BSD/OS separates this code -- itojun */
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while (ln && ln != &llinfo_nd6) {
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struct rtentry *rt;
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struct ifnet *ifp;
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struct sockaddr_in6 *dst;
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struct llinfo_nd6 *next = ln->ln_next;
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/* XXX: used for the DELAY case only: */
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struct nd_ifinfo *ndi = NULL;
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if ((rt = ln->ln_rt) == NULL) {
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ln = next;
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continue;
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}
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if ((ifp = rt->rt_ifp) == NULL) {
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ln = next;
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continue;
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}
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ndi = &nd_ifinfo[ifp->if_index];
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dst = (struct sockaddr_in6 *)rt_key(rt);
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if (ln->ln_expire > time_second) {
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ln = next;
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continue;
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}
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/* sanity check */
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if (!rt)
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panic("rt=0 in nd6_timer(ln=%p)\n", ln);
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if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln)
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panic("rt_llinfo(%p) is not equal to ln(%p)\n",
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rt->rt_llinfo, ln);
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if (!dst)
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panic("dst=0 in nd6_timer(ln=%p)\n", ln);
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switch (ln->ln_state) {
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case ND6_LLINFO_INCOMPLETE:
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if (ln->ln_asked < nd6_mmaxtries) {
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ln->ln_asked++;
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ln->ln_expire = time_second +
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nd_ifinfo[ifp->if_index].retrans / 1000;
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nd6_ns_output(ifp, NULL, &dst->sin6_addr,
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ln, 0);
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} else {
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struct mbuf *m = ln->ln_hold;
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if (m) {
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if (rt->rt_ifp) {
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/*
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* Fake rcvif to make ICMP error
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* more helpful in diagnosing
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* for the receiver.
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* XXX: should we consider
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* older rcvif?
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*/
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m->m_pkthdr.rcvif = rt->rt_ifp;
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}
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icmp6_error(m, ICMP6_DST_UNREACH,
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ICMP6_DST_UNREACH_ADDR, 0);
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ln->ln_hold = NULL;
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}
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nd6_free(rt);
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}
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break;
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case ND6_LLINFO_REACHABLE:
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if (ln->ln_expire)
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ln->ln_state = ND6_LLINFO_STALE;
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break;
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/*
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* ND6_LLINFO_STALE state requires nothing for timer
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* routine.
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*/
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case ND6_LLINFO_DELAY:
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if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
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/* We need NUD */
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ln->ln_asked = 1;
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ln->ln_state = ND6_LLINFO_PROBE;
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ln->ln_expire = time_second +
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ndi->retrans / 1000;
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nd6_ns_output(ifp, &dst->sin6_addr,
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&dst->sin6_addr,
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ln, 0);
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} else
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ln->ln_state = ND6_LLINFO_STALE; /* XXX */
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break;
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case ND6_LLINFO_PROBE:
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if (ln->ln_asked < nd6_umaxtries) {
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ln->ln_asked++;
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ln->ln_expire = time_second +
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nd_ifinfo[ifp->if_index].retrans / 1000;
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nd6_ns_output(ifp, &dst->sin6_addr,
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&dst->sin6_addr, ln, 0);
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} else {
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nd6_free(rt);
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}
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break;
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case ND6_LLINFO_WAITDELETE:
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nd6_free(rt);
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break;
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}
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ln = next;
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}
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/* expire */
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dr = TAILQ_FIRST(&nd_defrouter);
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while (dr) {
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if (dr->expire && dr->expire < time_second) {
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struct nd_defrouter *t;
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t = TAILQ_NEXT(dr, dr_entry);
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defrtrlist_del(dr);
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dr = t;
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} else {
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dr = TAILQ_NEXT(dr, dr_entry);
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}
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}
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pr = nd_prefix.lh_first;
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while (pr) {
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struct in6_ifaddr *ia6;
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struct in6_addrlifetime *lt6;
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if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
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ia6 = NULL;
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else
|
|
ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr);
|
|
|
|
if (ia6) {
|
|
/* check address lifetime */
|
|
lt6 = &ia6->ia6_lifetime;
|
|
if (lt6->ia6t_preferred && lt6->ia6t_preferred < time_second)
|
|
ia6->ia6_flags |= IN6_IFF_DEPRECATED;
|
|
if (lt6->ia6t_expire && lt6->ia6t_expire < time_second) {
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
|
|
in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
|
|
/* xxx ND_OPT_PI_FLAG_ONLINK processing */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check prefix lifetime.
|
|
* since pltime is just for autoconf, pltime processing for
|
|
* prefix is not necessary.
|
|
*
|
|
* we offset expire time by NDPR_KEEP_EXPIRE, so that we
|
|
* can use the old prefix information to validate the
|
|
* next prefix information to come. See prelist_update()
|
|
* for actual validation.
|
|
*/
|
|
if (pr->ndpr_expire
|
|
&& pr->ndpr_expire + NDPR_KEEP_EXPIRED < time_second) {
|
|
struct nd_prefix *t;
|
|
t = pr->ndpr_next;
|
|
|
|
/*
|
|
* address expiration and prefix expiration are
|
|
* separate. NEVER perform in6_ifdel here.
|
|
*/
|
|
|
|
prelist_remove(pr);
|
|
pr = t;
|
|
} else
|
|
pr = pr->ndpr_next;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Nuke neighbor cache/prefix/default router management table, right before
|
|
* ifp goes away.
|
|
*/
|
|
void
|
|
nd6_purge(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct llinfo_nd6 *ln, *nln;
|
|
struct nd_defrouter *dr, *ndr, drany;
|
|
struct nd_prefix *pr, *npr;
|
|
|
|
/* Nuke default router list entries toward ifp */
|
|
if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
|
|
/*
|
|
* The first entry of the list may be stored in
|
|
* the routing table, so we'll delete it later.
|
|
*/
|
|
for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) {
|
|
ndr = TAILQ_NEXT(dr, dr_entry);
|
|
if (dr->ifp == ifp)
|
|
defrtrlist_del(dr);
|
|
}
|
|
dr = TAILQ_FIRST(&nd_defrouter);
|
|
if (dr->ifp == ifp)
|
|
defrtrlist_del(dr);
|
|
}
|
|
|
|
/* Nuke prefix list entries toward ifp */
|
|
for (pr = nd_prefix.lh_first; pr; pr = npr) {
|
|
npr = pr->ndpr_next;
|
|
if (pr->ndpr_ifp == ifp) {
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
|
|
in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
|
|
prelist_remove(pr);
|
|
}
|
|
}
|
|
|
|
/* cancel default outgoing interface setting */
|
|
if (nd6_defifindex == ifp->if_index)
|
|
nd6_setdefaultiface(0);
|
|
|
|
/* refresh default router list */
|
|
bzero(&drany, sizeof(drany));
|
|
defrouter_delreq(&drany, 0);
|
|
defrouter_select();
|
|
|
|
/*
|
|
* Nuke neighbor cache entries for the ifp.
|
|
* Note that rt->rt_ifp may not be the same as ifp,
|
|
* due to KAME goto ours hack. See RTM_RESOLVE case in
|
|
* nd6_rtrequest(), and ip6_input().
|
|
*/
|
|
ln = llinfo_nd6.ln_next;
|
|
while (ln && ln != &llinfo_nd6) {
|
|
struct rtentry *rt;
|
|
struct sockaddr_dl *sdl;
|
|
|
|
nln = ln->ln_next;
|
|
rt = ln->ln_rt;
|
|
if (rt && rt->rt_gateway &&
|
|
rt->rt_gateway->sa_family == AF_LINK) {
|
|
sdl = (struct sockaddr_dl *)rt->rt_gateway;
|
|
if (sdl->sdl_index == ifp->if_index)
|
|
nd6_free(rt);
|
|
}
|
|
ln = nln;
|
|
}
|
|
|
|
/*
|
|
* Neighbor cache entry for interface route will be retained
|
|
* with ND6_LLINFO_WAITDELETE state, by nd6_free(). Nuke it.
|
|
*/
|
|
ln = llinfo_nd6.ln_next;
|
|
while (ln && ln != &llinfo_nd6) {
|
|
struct rtentry *rt;
|
|
struct sockaddr_dl *sdl;
|
|
|
|
nln = ln->ln_next;
|
|
rt = ln->ln_rt;
|
|
if (rt && rt->rt_gateway &&
|
|
rt->rt_gateway->sa_family == AF_LINK) {
|
|
sdl = (struct sockaddr_dl *)rt->rt_gateway;
|
|
if (sdl->sdl_index == ifp->if_index) {
|
|
rtrequest(RTM_DELETE, rt_key(rt),
|
|
(struct sockaddr *)0, rt_mask(rt), 0,
|
|
(struct rtentry **)0);
|
|
}
|
|
}
|
|
ln = nln;
|
|
}
|
|
}
|
|
|
|
struct rtentry *
|
|
nd6_lookup(addr6, create, ifp)
|
|
struct in6_addr *addr6;
|
|
int create;
|
|
struct ifnet *ifp;
|
|
{
|
|
struct rtentry *rt;
|
|
struct sockaddr_in6 sin6;
|
|
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = *addr6;
|
|
#ifdef SCOPEDROUTING
|
|
sin6.sin6_scope_id = in6_addr2scopeid(ifp, addr6);
|
|
#endif
|
|
rt = rtalloc1((struct sockaddr *)&sin6, create, 0UL);
|
|
if (rt && (rt->rt_flags & RTF_LLINFO) == 0) {
|
|
/*
|
|
* This is the case for the default route.
|
|
* If we want to create a neighbor cache for the address, we
|
|
* should free the route for the destination and allocate an
|
|
* interface route.
|
|
*/
|
|
if (create) {
|
|
RTFREE(rt);
|
|
rt = 0;
|
|
}
|
|
}
|
|
if (!rt) {
|
|
if (create && ifp) {
|
|
int e;
|
|
|
|
/*
|
|
* If no route is available and create is set,
|
|
* we allocate a host route for the destination
|
|
* and treat it like an interface route.
|
|
* This hack is necessary for a neighbor which can't
|
|
* be covered by our own prefix.
|
|
*/
|
|
struct ifaddr *ifa =
|
|
ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp);
|
|
if (ifa == NULL)
|
|
return(NULL);
|
|
|
|
/*
|
|
* Create a new route. RTF_LLINFO is necessary
|
|
* to create a Neighbor Cache entry for the
|
|
* destination in nd6_rtrequest which will be
|
|
* called in rtequest via ifa->ifa_rtrequest.
|
|
*/
|
|
if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6,
|
|
ifa->ifa_addr,
|
|
(struct sockaddr *)&all1_sa,
|
|
(ifa->ifa_flags |
|
|
RTF_HOST | RTF_LLINFO) &
|
|
~RTF_CLONING,
|
|
&rt)) != 0)
|
|
log(LOG_ERR,
|
|
"nd6_lookup: failed to add route for a "
|
|
"neighbor(%s), errno=%d\n",
|
|
ip6_sprintf(addr6), e);
|
|
if (rt == NULL)
|
|
return(NULL);
|
|
if (rt->rt_llinfo) {
|
|
struct llinfo_nd6 *ln =
|
|
(struct llinfo_nd6 *)rt->rt_llinfo;
|
|
ln->ln_state = ND6_LLINFO_NOSTATE;
|
|
}
|
|
} else
|
|
return(NULL);
|
|
}
|
|
rt->rt_refcnt--;
|
|
/*
|
|
* Validation for the entry.
|
|
* XXX: we can't use rt->rt_ifp to check for the interface, since
|
|
* it might be the loopback interface if the entry is for our
|
|
* own address on a non-loopback interface. Instead, we should
|
|
* use rt->rt_ifa->ifa_ifp, which would specify the REAL interface.
|
|
*/
|
|
if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 ||
|
|
rt->rt_gateway->sa_family != AF_LINK ||
|
|
(ifp && rt->rt_ifa->ifa_ifp != ifp)) {
|
|
if (create) {
|
|
log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
|
|
ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
|
|
/* xxx more logs... kazu */
|
|
}
|
|
return(0);
|
|
}
|
|
return(rt);
|
|
}
|
|
|
|
/*
|
|
* Detect if a given IPv6 address identifies a neighbor on a given link.
|
|
* XXX: should take care of the destination of a p2p link?
|
|
*/
|
|
int
|
|
nd6_is_addr_neighbor(addr, ifp)
|
|
struct sockaddr_in6 *addr;
|
|
struct ifnet *ifp;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
int i;
|
|
|
|
#define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr)
|
|
#define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr)
|
|
|
|
/*
|
|
* A link-local address is always a neighbor.
|
|
* XXX: we should use the sin6_scope_id field rather than the embedded
|
|
* interface index.
|
|
*/
|
|
if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) &&
|
|
ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index)
|
|
return(1);
|
|
|
|
/*
|
|
* If the address matches one of our addresses,
|
|
* it should be a neighbor.
|
|
*/
|
|
for (ifa = ifp->if_addrlist.tqh_first;
|
|
ifa;
|
|
ifa = ifa->ifa_list.tqe_next)
|
|
{
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
next: continue;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
if ((IFADDR6(ifa).s6_addr32[i] ^
|
|
addr->sin6_addr.s6_addr32[i]) &
|
|
IFMASK6(ifa).s6_addr32[i])
|
|
goto next;
|
|
}
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
* Even if the address matches none of our addresses, it might be
|
|
* in the neighbor cache.
|
|
*/
|
|
if (nd6_lookup(&addr->sin6_addr, 0, ifp))
|
|
return(1);
|
|
|
|
return(0);
|
|
#undef IFADDR6
|
|
#undef IFMASK6
|
|
}
|
|
|
|
/*
|
|
* Free an nd6 llinfo entry.
|
|
*/
|
|
void
|
|
nd6_free(rt)
|
|
struct rtentry *rt;
|
|
{
|
|
struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
struct sockaddr_dl *sdl;
|
|
struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
|
|
struct nd_defrouter *dr;
|
|
|
|
/*
|
|
* Clear all destination cache entries for the neighbor.
|
|
* XXX: is it better to restrict this to hosts?
|
|
*/
|
|
pfctlinput(PRC_HOSTDEAD, rt_key(rt));
|
|
|
|
if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
|
|
int s;
|
|
s = splnet();
|
|
dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
|
|
rt->rt_ifp);
|
|
if (ln->ln_router || dr) {
|
|
/*
|
|
* rt6_flush must be called whether or not the neighbor
|
|
* is in the Default Router List.
|
|
* See a corresponding comment in nd6_na_input().
|
|
*/
|
|
rt6_flush(&in6, rt->rt_ifp);
|
|
}
|
|
|
|
if (dr) {
|
|
/*
|
|
* Unreachablity of a router might affect the default
|
|
* router selection and on-link detection of advertised
|
|
* prefixes.
|
|
*/
|
|
|
|
/*
|
|
* Temporarily fake the state to choose a new default
|
|
* router and to perform on-link determination of
|
|
* prefixes coreectly.
|
|
* Below the state will be set correctly,
|
|
* or the entry itself will be deleted.
|
|
*/
|
|
ln->ln_state = ND6_LLINFO_INCOMPLETE;
|
|
|
|
if (dr == TAILQ_FIRST(&nd_defrouter)) {
|
|
/*
|
|
* It is used as the current default router,
|
|
* so we have to move it to the end of the
|
|
* list and choose a new one.
|
|
* XXX: it is not very efficient if this is
|
|
* the only router.
|
|
*/
|
|
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
|
|
TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry);
|
|
|
|
defrouter_select();
|
|
}
|
|
pfxlist_onlink_check();
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) &&
|
|
sdl->sdl_family == AF_LINK) {
|
|
sdl->sdl_alen = 0;
|
|
ln->ln_state = ND6_LLINFO_WAITDELETE;
|
|
ln->ln_asked = 0;
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
return;
|
|
}
|
|
|
|
rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
|
|
rt_mask(rt), 0, (struct rtentry **)0);
|
|
}
|
|
|
|
/*
|
|
* Upper-layer reachability hint for Neighbor Unreachability Detection.
|
|
*
|
|
* XXX cost-effective metods?
|
|
*/
|
|
void
|
|
nd6_nud_hint(rt, dst6, force)
|
|
struct rtentry *rt;
|
|
struct in6_addr *dst6;
|
|
int force;
|
|
{
|
|
struct llinfo_nd6 *ln;
|
|
|
|
/*
|
|
* If the caller specified "rt", use that. Otherwise, resolve the
|
|
* routing table by supplied "dst6".
|
|
*/
|
|
if (!rt) {
|
|
if (!dst6)
|
|
return;
|
|
if (!(rt = nd6_lookup(dst6, 0, NULL)))
|
|
return;
|
|
}
|
|
|
|
if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
|
|
(rt->rt_flags & RTF_LLINFO) == 0 ||
|
|
!rt->rt_llinfo || !rt->rt_gateway ||
|
|
rt->rt_gateway->sa_family != AF_LINK) {
|
|
/* This is not a host route. */
|
|
return;
|
|
}
|
|
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
if (ln->ln_state < ND6_LLINFO_REACHABLE)
|
|
return;
|
|
|
|
/*
|
|
* if we get upper-layer reachability confirmation many times,
|
|
* it is possible we have false information.
|
|
*/
|
|
if (!force) {
|
|
ln->ln_byhint++;
|
|
if (ln->ln_byhint > nd6_maxnudhint)
|
|
return;
|
|
}
|
|
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
if (ln->ln_expire)
|
|
ln->ln_expire = time_second +
|
|
nd_ifinfo[rt->rt_ifp->if_index].reachable;
|
|
}
|
|
|
|
#ifdef OLDIP6OUTPUT
|
|
/*
|
|
* Resolve an IP6 address into an ethernet address. If success,
|
|
* desten is filled in. If there is no entry in ndptab,
|
|
* set one up and multicast a solicitation for the IP6 address.
|
|
* Hold onto this mbuf and resend it once the address
|
|
* is finally resolved. A return value of 1 indicates
|
|
* that desten has been filled in and the packet should be sent
|
|
* normally; a 0 return indicates that the packet has been
|
|
* taken over here, either now or for later transmission.
|
|
*/
|
|
int
|
|
nd6_resolve(ifp, rt, m, dst, desten)
|
|
struct ifnet *ifp;
|
|
struct rtentry *rt;
|
|
struct mbuf *m;
|
|
struct sockaddr *dst;
|
|
u_char *desten;
|
|
{
|
|
struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
|
|
struct sockaddr_dl *sdl;
|
|
|
|
if (m->m_flags & M_MCAST) {
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_FDDI:
|
|
ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
|
|
desten);
|
|
return(1);
|
|
break;
|
|
case IFT_ARCNET:
|
|
*desten = 0;
|
|
return(1);
|
|
break;
|
|
default:
|
|
return(0);
|
|
}
|
|
}
|
|
if (rt && (rt->rt_flags & RTF_LLINFO) != 0)
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
else {
|
|
if ((rt = nd6_lookup(&(SIN6(dst)->sin6_addr), 1, ifp)) != NULL)
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
}
|
|
if (!ln || !rt) {
|
|
log(LOG_DEBUG, "nd6_resolve: can't allocate llinfo for %s\n",
|
|
ip6_sprintf(&(SIN6(dst)->sin6_addr)));
|
|
m_freem(m);
|
|
return(0);
|
|
}
|
|
sdl = SDL(rt->rt_gateway);
|
|
/*
|
|
* Ckeck the address family and length is valid, the address
|
|
* is resolved; otherwise, try to resolve.
|
|
*/
|
|
if (ln->ln_state >= ND6_LLINFO_REACHABLE
|
|
&& sdl->sdl_family == AF_LINK
|
|
&& sdl->sdl_alen != 0) {
|
|
bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
|
|
if (ln->ln_state == ND6_LLINFO_STALE) {
|
|
ln->ln_asked = 0;
|
|
ln->ln_state = ND6_LLINFO_DELAY;
|
|
ln->ln_expire = time_second + nd6_delay;
|
|
}
|
|
return(1);
|
|
}
|
|
/*
|
|
* There is an ndp entry, but no ethernet address
|
|
* response yet. Replace the held mbuf with this
|
|
* latest one.
|
|
*
|
|
* XXX Does the code conform to rate-limiting rule?
|
|
* (RFC 2461 7.2.2)
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_WAITDELETE ||
|
|
ln->ln_state == ND6_LLINFO_NOSTATE)
|
|
ln->ln_state = ND6_LLINFO_INCOMPLETE;
|
|
if (ln->ln_hold)
|
|
m_freem(ln->ln_hold);
|
|
ln->ln_hold = m;
|
|
if (ln->ln_expire) {
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
if (ln->ln_asked < nd6_mmaxtries &&
|
|
ln->ln_expire < time_second) {
|
|
ln->ln_asked++;
|
|
ln->ln_expire = time_second +
|
|
nd_ifinfo[ifp->if_index].retrans / 1000;
|
|
nd6_ns_output(ifp, NULL, &(SIN6(dst)->sin6_addr),
|
|
ln, 0);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
#endif /* OLDIP6OUTPUT */
|
|
|
|
void
|
|
nd6_rtrequest(req, rt, sa)
|
|
int req;
|
|
struct rtentry *rt;
|
|
struct sockaddr *sa; /* xxx unused */
|
|
{
|
|
struct sockaddr *gate = rt->rt_gateway;
|
|
struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
|
|
struct ifnet *ifp = rt->rt_ifp;
|
|
struct ifaddr *ifa;
|
|
|
|
if (rt->rt_flags & RTF_GATEWAY)
|
|
return;
|
|
|
|
switch (req) {
|
|
case RTM_ADD:
|
|
/*
|
|
* There is no backward compatibility :)
|
|
*
|
|
* if ((rt->rt_flags & RTF_HOST) == 0 &&
|
|
* SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
|
|
* rt->rt_flags |= RTF_CLONING;
|
|
*/
|
|
if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
|
|
/*
|
|
* Case 1: This route should come from
|
|
* a route to interface. RTF_LLINFO flag is set
|
|
* for a host route whose destination should be
|
|
* treated as on-link.
|
|
*/
|
|
rt_setgate(rt, rt_key(rt),
|
|
(struct sockaddr *)&null_sdl);
|
|
gate = rt->rt_gateway;
|
|
SDL(gate)->sdl_type = ifp->if_type;
|
|
SDL(gate)->sdl_index = ifp->if_index;
|
|
if (ln)
|
|
ln->ln_expire = time_second;
|
|
#if 1
|
|
if (ln && ln->ln_expire == 0) {
|
|
/* cludge for desktops */
|
|
#if 0
|
|
printf("nd6_request: time.tv_sec is zero; "
|
|
"treat it as 1\n");
|
|
#endif
|
|
ln->ln_expire = 1;
|
|
}
|
|
#endif
|
|
if (rt->rt_flags & RTF_CLONING)
|
|
break;
|
|
}
|
|
/*
|
|
* In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
|
|
* We don't do that here since llinfo is not ready yet.
|
|
*
|
|
* There are also couple of other things to be discussed:
|
|
* - unsolicited NA code needs improvement beforehand
|
|
* - RFC2461 says we MAY send multicast unsolicited NA
|
|
* (7.2.6 paragraph 4), however, it also says that we
|
|
* SHOULD provide a mechanism to prevent multicast NA storm.
|
|
* we don't have anything like it right now.
|
|
* note that the mechanism need a mutual agreement
|
|
* between proxies, which means that we need to implement
|
|
* a new protocol, or new kludge.
|
|
* - from RFC2461 6.2.4, host MUST NOT send unsolicited NA.
|
|
* we need to check ip6forwarding before sending it.
|
|
* (or should we allow proxy ND configuration only for
|
|
* routers? there's no mention about proxy ND from hosts)
|
|
*/
|
|
#if 0
|
|
/* XXX it does not work */
|
|
if (rt->rt_flags & RTF_ANNOUNCE)
|
|
nd6_na_output(ifp,
|
|
&SIN6(rt_key(rt))->sin6_addr,
|
|
&SIN6(rt_key(rt))->sin6_addr,
|
|
ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
|
|
1, NULL);
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
case RTM_RESOLVE:
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
|
|
/*
|
|
* Address resolution isn't necessary for a point to
|
|
* point link, so we can skip this test for a p2p link.
|
|
*/
|
|
if (gate->sa_family != AF_LINK ||
|
|
gate->sa_len < sizeof(null_sdl)) {
|
|
log(LOG_DEBUG,
|
|
"nd6_rtrequest: bad gateway value\n");
|
|
break;
|
|
}
|
|
SDL(gate)->sdl_type = ifp->if_type;
|
|
SDL(gate)->sdl_index = ifp->if_index;
|
|
}
|
|
if (ln != NULL)
|
|
break; /* This happens on a route change */
|
|
/*
|
|
* Case 2: This route may come from cloning, or a manual route
|
|
* add with a LL address.
|
|
*/
|
|
R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln));
|
|
rt->rt_llinfo = (caddr_t)ln;
|
|
if (!ln) {
|
|
log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n");
|
|
break;
|
|
}
|
|
nd6_inuse++;
|
|
nd6_allocated++;
|
|
Bzero(ln, sizeof(*ln));
|
|
ln->ln_rt = rt;
|
|
/* this is required for "ndp" command. - shin */
|
|
if (req == RTM_ADD) {
|
|
/*
|
|
* gate should have some valid AF_LINK entry,
|
|
* and ln->ln_expire should have some lifetime
|
|
* which is specified by ndp command.
|
|
*/
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
ln->ln_byhint = 0;
|
|
} else {
|
|
/*
|
|
* When req == RTM_RESOLVE, rt is created and
|
|
* initialized in rtrequest(), so rt_expire is 0.
|
|
*/
|
|
ln->ln_state = ND6_LLINFO_NOSTATE;
|
|
ln->ln_expire = time_second;
|
|
}
|
|
rt->rt_flags |= RTF_LLINFO;
|
|
ln->ln_next = llinfo_nd6.ln_next;
|
|
llinfo_nd6.ln_next = ln;
|
|
ln->ln_prev = &llinfo_nd6;
|
|
ln->ln_next->ln_prev = ln;
|
|
|
|
/*
|
|
* check if rt_key(rt) is one of my address assigned
|
|
* to the interface.
|
|
*/
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
|
|
&SIN6(rt_key(rt))->sin6_addr);
|
|
if (ifa) {
|
|
caddr_t macp = nd6_ifptomac(ifp);
|
|
ln->ln_expire = 0;
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
ln->ln_byhint = 0;
|
|
if (macp) {
|
|
Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen);
|
|
SDL(gate)->sdl_alen = ifp->if_addrlen;
|
|
}
|
|
if (nd6_useloopback) {
|
|
rt->rt_ifp = &loif[0]; /*XXX*/
|
|
/*
|
|
* Make sure rt_ifa be equal to the ifaddr
|
|
* corresponding to the address.
|
|
* We need this because when we refer
|
|
* rt_ifa->ia6_flags in ip6_input, we assume
|
|
* that the rt_ifa points to the address instead
|
|
* of the loopback address.
|
|
*/
|
|
if (ifa != rt->rt_ifa) {
|
|
IFAFREE(rt->rt_ifa);
|
|
ifa->ifa_refcnt++;
|
|
rt->rt_ifa = ifa;
|
|
}
|
|
}
|
|
} else if (rt->rt_flags & RTF_ANNOUNCE) {
|
|
ln->ln_expire = 0;
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
ln->ln_byhint = 0;
|
|
|
|
/* join solicited node multicast for proxy ND */
|
|
if (ifp->if_flags & IFF_MULTICAST) {
|
|
struct in6_addr llsol;
|
|
int error;
|
|
|
|
llsol = SIN6(rt_key(rt))->sin6_addr;
|
|
llsol.s6_addr16[0] = htons(0xff02);
|
|
llsol.s6_addr16[1] = htons(ifp->if_index);
|
|
llsol.s6_addr32[1] = 0;
|
|
llsol.s6_addr32[2] = htonl(1);
|
|
llsol.s6_addr8[12] = 0xff;
|
|
|
|
(void)in6_addmulti(&llsol, ifp, &error);
|
|
if (error)
|
|
printf(
|
|
"nd6_rtrequest: could not join solicited node multicast (errno=%d)\n", error);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case RTM_DELETE:
|
|
if (!ln)
|
|
break;
|
|
/* leave from solicited node multicast for proxy ND */
|
|
if ((rt->rt_flags & RTF_ANNOUNCE) != 0 &&
|
|
(ifp->if_flags & IFF_MULTICAST) != 0) {
|
|
struct in6_addr llsol;
|
|
struct in6_multi *in6m;
|
|
|
|
llsol = SIN6(rt_key(rt))->sin6_addr;
|
|
llsol.s6_addr16[0] = htons(0xff02);
|
|
llsol.s6_addr16[1] = htons(ifp->if_index);
|
|
llsol.s6_addr32[1] = 0;
|
|
llsol.s6_addr32[2] = htonl(1);
|
|
llsol.s6_addr8[12] = 0xff;
|
|
|
|
IN6_LOOKUP_MULTI(llsol, ifp, in6m);
|
|
if (in6m)
|
|
in6_delmulti(in6m);
|
|
}
|
|
nd6_inuse--;
|
|
ln->ln_next->ln_prev = ln->ln_prev;
|
|
ln->ln_prev->ln_next = ln->ln_next;
|
|
ln->ln_prev = NULL;
|
|
rt->rt_llinfo = 0;
|
|
rt->rt_flags &= ~RTF_LLINFO;
|
|
if (ln->ln_hold)
|
|
m_freem(ln->ln_hold);
|
|
Free((caddr_t)ln);
|
|
}
|
|
}
|
|
|
|
void
|
|
nd6_p2p_rtrequest(req, rt, sa)
|
|
int req;
|
|
struct rtentry *rt;
|
|
struct sockaddr *sa; /* xxx unused */
|
|
{
|
|
struct sockaddr *gate = rt->rt_gateway;
|
|
static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
|
|
struct ifnet *ifp = rt->rt_ifp;
|
|
struct ifaddr *ifa;
|
|
|
|
if (rt->rt_flags & RTF_GATEWAY)
|
|
return;
|
|
|
|
switch (req) {
|
|
case RTM_ADD:
|
|
/*
|
|
* There is no backward compatibility :)
|
|
*
|
|
* if ((rt->rt_flags & RTF_HOST) == 0 &&
|
|
* SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
|
|
* rt->rt_flags |= RTF_CLONING;
|
|
*/
|
|
if (rt->rt_flags & RTF_CLONING) {
|
|
/*
|
|
* Case 1: This route should come from
|
|
* a route to interface.
|
|
*/
|
|
rt_setgate(rt, rt_key(rt),
|
|
(struct sockaddr *)&null_sdl);
|
|
gate = rt->rt_gateway;
|
|
SDL(gate)->sdl_type = ifp->if_type;
|
|
SDL(gate)->sdl_index = ifp->if_index;
|
|
break;
|
|
}
|
|
/* Announce a new entry if requested. */
|
|
if (rt->rt_flags & RTF_ANNOUNCE)
|
|
nd6_na_output(ifp,
|
|
&SIN6(rt_key(rt))->sin6_addr,
|
|
&SIN6(rt_key(rt))->sin6_addr,
|
|
ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
|
|
1, NULL);
|
|
/* FALLTHROUGH */
|
|
case RTM_RESOLVE:
|
|
/*
|
|
* check if rt_key(rt) is one of my address assigned
|
|
* to the interface.
|
|
*/
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
|
|
&SIN6(rt_key(rt))->sin6_addr);
|
|
if (ifa) {
|
|
if (nd6_useloopback) {
|
|
rt->rt_ifp = &loif[0]; /*XXX*/
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
nd6_ioctl(cmd, data, ifp)
|
|
u_long cmd;
|
|
caddr_t data;
|
|
struct ifnet *ifp;
|
|
{
|
|
struct in6_drlist *drl = (struct in6_drlist *)data;
|
|
struct in6_prlist *prl = (struct in6_prlist *)data;
|
|
struct in6_ndireq *ndi = (struct in6_ndireq *)data;
|
|
struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
|
|
struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
|
|
struct nd_defrouter *dr, any;
|
|
struct nd_prefix *pr;
|
|
struct rtentry *rt;
|
|
int i = 0, error = 0;
|
|
int s;
|
|
|
|
switch (cmd) {
|
|
case SIOCGDRLST_IN6:
|
|
bzero(drl, sizeof(*drl));
|
|
s = splnet();
|
|
dr = TAILQ_FIRST(&nd_defrouter);
|
|
while (dr && i < DRLSTSIZ) {
|
|
drl->defrouter[i].rtaddr = dr->rtaddr;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) {
|
|
/* XXX: need to this hack for KAME stack */
|
|
drl->defrouter[i].rtaddr.s6_addr16[1] = 0;
|
|
} else
|
|
log(LOG_ERR,
|
|
"default router list contains a "
|
|
"non-linklocal address(%s)\n",
|
|
ip6_sprintf(&drl->defrouter[i].rtaddr));
|
|
|
|
drl->defrouter[i].flags = dr->flags;
|
|
drl->defrouter[i].rtlifetime = dr->rtlifetime;
|
|
drl->defrouter[i].expire = dr->expire;
|
|
drl->defrouter[i].if_index = dr->ifp->if_index;
|
|
i++;
|
|
dr = TAILQ_NEXT(dr, dr_entry);
|
|
}
|
|
splx(s);
|
|
break;
|
|
case SIOCGPRLST_IN6:
|
|
/*
|
|
* XXX meaning of fields, especialy "raflags", is very
|
|
* differnet between RA prefix list and RR/static prefix list.
|
|
* how about separating ioctls into two?
|
|
*/
|
|
bzero(prl, sizeof(*prl));
|
|
s = splnet();
|
|
pr = nd_prefix.lh_first;
|
|
while (pr && i < PRLSTSIZ) {
|
|
struct nd_pfxrouter *pfr;
|
|
int j;
|
|
|
|
prl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
|
|
prl->prefix[i].raflags = pr->ndpr_raf;
|
|
prl->prefix[i].prefixlen = pr->ndpr_plen;
|
|
prl->prefix[i].vltime = pr->ndpr_vltime;
|
|
prl->prefix[i].pltime = pr->ndpr_pltime;
|
|
prl->prefix[i].if_index = pr->ndpr_ifp->if_index;
|
|
prl->prefix[i].expire = pr->ndpr_expire;
|
|
|
|
pfr = pr->ndpr_advrtrs.lh_first;
|
|
j = 0;
|
|
while(pfr) {
|
|
if (j < DRLSTSIZ) {
|
|
#define RTRADDR prl->prefix[i].advrtr[j]
|
|
RTRADDR = pfr->router->rtaddr;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) {
|
|
/* XXX: hack for KAME */
|
|
RTRADDR.s6_addr16[1] = 0;
|
|
} else
|
|
log(LOG_ERR,
|
|
"a router(%s) advertises "
|
|
"a prefix with "
|
|
"non-link local address\n",
|
|
ip6_sprintf(&RTRADDR));
|
|
#undef RTRADDR
|
|
}
|
|
j++;
|
|
pfr = pfr->pfr_next;
|
|
}
|
|
prl->prefix[i].advrtrs = j;
|
|
prl->prefix[i].origin = PR_ORIG_RA;
|
|
|
|
i++;
|
|
pr = pr->ndpr_next;
|
|
}
|
|
{
|
|
struct rr_prefix *rpp;
|
|
|
|
for (rpp = LIST_FIRST(&rr_prefix); rpp;
|
|
rpp = LIST_NEXT(rpp, rp_entry)) {
|
|
if (i >= PRLSTSIZ)
|
|
break;
|
|
prl->prefix[i].prefix = rpp->rp_prefix.sin6_addr;
|
|
prl->prefix[i].raflags = rpp->rp_raf;
|
|
prl->prefix[i].prefixlen = rpp->rp_plen;
|
|
prl->prefix[i].vltime = rpp->rp_vltime;
|
|
prl->prefix[i].pltime = rpp->rp_pltime;
|
|
prl->prefix[i].if_index = rpp->rp_ifp->if_index;
|
|
prl->prefix[i].expire = rpp->rp_expire;
|
|
prl->prefix[i].advrtrs = 0;
|
|
prl->prefix[i].origin = rpp->rp_origin;
|
|
i++;
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
break;
|
|
case SIOCGIFINFO_IN6:
|
|
if (!nd_ifinfo || i >= nd_ifinfo_indexlim) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ndi->ndi = nd_ifinfo[ifp->if_index];
|
|
break;
|
|
case SIOCSIFINFO_FLAGS:
|
|
/* XXX: almost all other fields of ndi->ndi is unused */
|
|
if (!nd_ifinfo || i >= nd_ifinfo_indexlim) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags;
|
|
break;
|
|
case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
|
|
/* flush default router list */
|
|
/*
|
|
* xxx sumikawa: should not delete route if default
|
|
* route equals to the top of default router list
|
|
*/
|
|
bzero(&any, sizeof(any));
|
|
defrouter_delreq(&any, 0);
|
|
defrouter_select();
|
|
/* xxx sumikawa: flush prefix list */
|
|
break;
|
|
case SIOCSPFXFLUSH_IN6:
|
|
{
|
|
/* flush all the prefix advertised by routers */
|
|
struct nd_prefix *pr, *next;
|
|
|
|
s = splnet();
|
|
for (pr = nd_prefix.lh_first; pr; pr = next) {
|
|
next = pr->ndpr_next;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
|
|
in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
|
|
prelist_remove(pr);
|
|
}
|
|
splx(s);
|
|
break;
|
|
}
|
|
case SIOCSRTRFLUSH_IN6:
|
|
{
|
|
/* flush all the default routers */
|
|
struct nd_defrouter *dr, *next;
|
|
|
|
s = splnet();
|
|
if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
|
|
/*
|
|
* The first entry of the list may be stored in
|
|
* the routing table, so we'll delete it later.
|
|
*/
|
|
for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) {
|
|
next = TAILQ_NEXT(dr, dr_entry);
|
|
defrtrlist_del(dr);
|
|
}
|
|
defrtrlist_del(TAILQ_FIRST(&nd_defrouter));
|
|
}
|
|
splx(s);
|
|
break;
|
|
}
|
|
case SIOCGNBRINFO_IN6:
|
|
{
|
|
struct llinfo_nd6 *ln;
|
|
struct in6_addr nb_addr = nbi->addr; /* make local for safety */
|
|
|
|
/*
|
|
* XXX: KAME specific hack for scoped addresses
|
|
* XXXX: for other scopes than link-local?
|
|
*/
|
|
if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) ||
|
|
IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) {
|
|
u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2];
|
|
|
|
if (*idp == 0)
|
|
*idp = htons(ifp->if_index);
|
|
}
|
|
|
|
s = splnet();
|
|
if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) {
|
|
error = EINVAL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
nbi->state = ln->ln_state;
|
|
nbi->asked = ln->ln_asked;
|
|
nbi->isrouter = ln->ln_router;
|
|
nbi->expire = ln->ln_expire;
|
|
splx(s);
|
|
|
|
break;
|
|
}
|
|
case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
|
|
ndif->ifindex = nd6_defifindex;
|
|
break;
|
|
case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
|
|
return(nd6_setdefaultiface(ndif->ifindex));
|
|
break;
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Create neighbor cache entry and cache link-layer address,
|
|
* on reception of inbound ND6 packets. (RS/RA/NS/redirect)
|
|
*/
|
|
struct rtentry *
|
|
nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code)
|
|
struct ifnet *ifp;
|
|
struct in6_addr *from;
|
|
char *lladdr;
|
|
int lladdrlen;
|
|
int type; /* ICMP6 type */
|
|
int code; /* type dependent information */
|
|
{
|
|
struct rtentry *rt = NULL;
|
|
struct llinfo_nd6 *ln = NULL;
|
|
int is_newentry;
|
|
struct sockaddr_dl *sdl = NULL;
|
|
int do_update;
|
|
int olladdr;
|
|
int llchange;
|
|
int newstate = 0;
|
|
|
|
if (!ifp)
|
|
panic("ifp == NULL in nd6_cache_lladdr");
|
|
if (!from)
|
|
panic("from == NULL in nd6_cache_lladdr");
|
|
|
|
/* nothing must be updated for unspecified address */
|
|
if (IN6_IS_ADDR_UNSPECIFIED(from))
|
|
return NULL;
|
|
|
|
/*
|
|
* Validation about ifp->if_addrlen and lladdrlen must be done in
|
|
* the caller.
|
|
*
|
|
* XXX If the link does not have link-layer adderss, what should
|
|
* we do? (ifp->if_addrlen == 0)
|
|
* Spec says nothing in sections for RA, RS and NA. There's small
|
|
* description on it in NS section (RFC 2461 7.2.3).
|
|
*/
|
|
|
|
rt = nd6_lookup(from, 0, ifp);
|
|
if (!rt) {
|
|
#if 0
|
|
/* nothing must be done if there's no lladdr */
|
|
if (!lladdr || !lladdrlen)
|
|
return NULL;
|
|
#endif
|
|
|
|
rt = nd6_lookup(from, 1, ifp);
|
|
is_newentry = 1;
|
|
} else
|
|
is_newentry = 0;
|
|
|
|
if (!rt)
|
|
return NULL;
|
|
if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) {
|
|
fail:
|
|
nd6_free(rt);
|
|
return NULL;
|
|
}
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
if (!ln)
|
|
goto fail;
|
|
if (!rt->rt_gateway)
|
|
goto fail;
|
|
if (rt->rt_gateway->sa_family != AF_LINK)
|
|
goto fail;
|
|
sdl = SDL(rt->rt_gateway);
|
|
|
|
olladdr = (sdl->sdl_alen) ? 1 : 0;
|
|
if (olladdr && lladdr) {
|
|
if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
|
|
llchange = 1;
|
|
else
|
|
llchange = 0;
|
|
} else
|
|
llchange = 0;
|
|
|
|
/*
|
|
* newentry olladdr lladdr llchange (*=record)
|
|
* 0 n n -- (1)
|
|
* 0 y n -- (2)
|
|
* 0 n y -- (3) * STALE
|
|
* 0 y y n (4) *
|
|
* 0 y y y (5) * STALE
|
|
* 1 -- n -- (6) NOSTATE(= PASSIVE)
|
|
* 1 -- y -- (7) * STALE
|
|
*/
|
|
|
|
if (lladdr) { /*(3-5) and (7)*/
|
|
/*
|
|
* Record source link-layer address
|
|
* XXX is it dependent to ifp->if_type?
|
|
*/
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
}
|
|
|
|
if (!is_newentry) {
|
|
if ((!olladdr && lladdr) /*(3)*/
|
|
|| (olladdr && lladdr && llchange)) { /*(5)*/
|
|
do_update = 1;
|
|
newstate = ND6_LLINFO_STALE;
|
|
} else /*(1-2,4)*/
|
|
do_update = 0;
|
|
} else {
|
|
do_update = 1;
|
|
if (!lladdr) /*(6)*/
|
|
newstate = ND6_LLINFO_NOSTATE;
|
|
else /*(7)*/
|
|
newstate = ND6_LLINFO_STALE;
|
|
}
|
|
|
|
if (do_update) {
|
|
/*
|
|
* Update the state of the neighbor cache.
|
|
*/
|
|
ln->ln_state = newstate;
|
|
|
|
if (ln->ln_state == ND6_LLINFO_STALE) {
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
if (ln->ln_hold) {
|
|
#ifdef OLDIP6OUTPUT
|
|
(*ifp->if_output)(ifp, ln->ln_hold,
|
|
rt_key(rt), rt);
|
|
#else
|
|
/*
|
|
* we assume ifp is not a p2p here, so just
|
|
* set the 2nd argument as the 1st one.
|
|
*/
|
|
nd6_output(ifp, ifp, ln->ln_hold,
|
|
(struct sockaddr_in6 *)rt_key(rt),
|
|
rt);
|
|
#endif
|
|
ln->ln_hold = 0;
|
|
}
|
|
} else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
|
|
/* probe right away */
|
|
ln->ln_expire = time_second;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ICMP6 type dependent behavior.
|
|
*
|
|
* NS: clear IsRouter if new entry
|
|
* RS: clear IsRouter
|
|
* RA: set IsRouter if there's lladdr
|
|
* redir: clear IsRouter if new entry
|
|
*
|
|
* RA case, (1):
|
|
* The spec says that we must set IsRouter in the following cases:
|
|
* - If lladdr exist, set IsRouter. This means (1-5).
|
|
* - If it is old entry (!newentry), set IsRouter. This means (7).
|
|
* So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
|
|
* A quetion arises for (1) case. (1) case has no lladdr in the
|
|
* neighbor cache, this is similar to (6).
|
|
* This case is rare but we figured that we MUST NOT set IsRouter.
|
|
*
|
|
* newentry olladdr lladdr llchange NS RS RA redir
|
|
* D R
|
|
* 0 n n -- (1) c ? s
|
|
* 0 y n -- (2) c s s
|
|
* 0 n y -- (3) c s s
|
|
* 0 y y n (4) c s s
|
|
* 0 y y y (5) c s s
|
|
* 1 -- n -- (6) c c c s
|
|
* 1 -- y -- (7) c c s c s
|
|
*
|
|
* (c=clear s=set)
|
|
*/
|
|
switch (type & 0xff) {
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
/*
|
|
* New entry must have is_router flag cleared.
|
|
*/
|
|
if (is_newentry) /*(6-7)*/
|
|
ln->ln_router = 0;
|
|
break;
|
|
case ND_REDIRECT:
|
|
/*
|
|
* If the icmp is a redirect to a better router, always set the
|
|
* is_router flag. Otherwise, if the entry is newly created,
|
|
* clear the flag. [RFC 2461, sec 8.3]
|
|
*/
|
|
if (code == ND_REDIRECT_ROUTER)
|
|
ln->ln_router = 1;
|
|
else if (is_newentry) /*(6-7)*/
|
|
ln->ln_router = 0;
|
|
break;
|
|
case ND_ROUTER_SOLICIT:
|
|
/*
|
|
* is_router flag must always be cleared.
|
|
*/
|
|
ln->ln_router = 0;
|
|
break;
|
|
case ND_ROUTER_ADVERT:
|
|
/*
|
|
* Mark an entry with lladdr as a router.
|
|
*/
|
|
if ((!is_newentry && (olladdr || lladdr)) /*(2-5)*/
|
|
|| (is_newentry && lladdr)) { /*(7)*/
|
|
ln->ln_router = 1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static void
|
|
nd6_slowtimo(ignored_arg)
|
|
void *ignored_arg;
|
|
{
|
|
int s = splnet();
|
|
register int i;
|
|
register struct nd_ifinfo *nd6if;
|
|
|
|
timeout(nd6_slowtimo, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz);
|
|
for (i = 1; i < if_index + 1; i++) {
|
|
if (!nd_ifinfo || i >= nd_ifinfo_indexlim)
|
|
continue;
|
|
nd6if = &nd_ifinfo[i];
|
|
if (nd6if->basereachable && /* already initialized */
|
|
(nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
|
|
/*
|
|
* Since reachable time rarely changes by router
|
|
* advertisements, we SHOULD insure that a new random
|
|
* value gets recomputed at least once every few hours.
|
|
* (RFC 2461, 6.3.4)
|
|
*/
|
|
nd6if->recalctm = nd6_recalc_reachtm_interval;
|
|
nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
|
|
}
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
#define senderr(e) { error = (e); goto bad;}
|
|
int
|
|
nd6_output(ifp, origifp, m0, dst, rt0)
|
|
register struct ifnet *ifp;
|
|
struct ifnet *origifp;
|
|
struct mbuf *m0;
|
|
struct sockaddr_in6 *dst;
|
|
struct rtentry *rt0;
|
|
{
|
|
register struct mbuf *m = m0;
|
|
register struct rtentry *rt = rt0;
|
|
struct sockaddr_in6 *gw6 = NULL;
|
|
struct llinfo_nd6 *ln = NULL;
|
|
int error = 0;
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
|
|
goto sendpkt;
|
|
|
|
/*
|
|
* XXX: we currently do not make neighbor cache on any interface
|
|
* other than ARCnet, Ethernet, FDDI and GIF.
|
|
*
|
|
* draft-ietf-ngtrans-mech-06.txt says:
|
|
* - unidirectional tunnels needs no ND
|
|
*/
|
|
switch (ifp->if_type) {
|
|
case IFT_ARCNET:
|
|
case IFT_ETHER:
|
|
case IFT_FDDI:
|
|
case IFT_GIF: /* XXX need more cases? */
|
|
break;
|
|
default:
|
|
goto sendpkt;
|
|
}
|
|
|
|
/*
|
|
* next hop determination. This routine is derived from ether_outpout.
|
|
*/
|
|
if (rt) {
|
|
if ((rt->rt_flags & RTF_UP) == 0) {
|
|
if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1, 0UL)) !=
|
|
NULL)
|
|
{
|
|
rt->rt_refcnt--;
|
|
if (rt->rt_ifp != ifp) {
|
|
/* XXX: loop care? */
|
|
return nd6_output(ifp, origifp, m0,
|
|
dst, rt);
|
|
}
|
|
} else
|
|
senderr(EHOSTUNREACH);
|
|
}
|
|
|
|
if (rt->rt_flags & RTF_GATEWAY) {
|
|
gw6 = (struct sockaddr_in6 *)rt->rt_gateway;
|
|
|
|
/*
|
|
* We skip link-layer address resolution and NUD
|
|
* if the gateway is not a neighbor from ND point
|
|
* of view, regardless the value of the value of
|
|
* nd_ifinfo.flags.
|
|
* The second condition is a bit tricky: we skip
|
|
* if the gateway is our own address, which is
|
|
* sometimes used to install a route to a p2p link.
|
|
*/
|
|
if (!nd6_is_addr_neighbor(gw6, ifp) ||
|
|
in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) {
|
|
if (rt->rt_flags & RTF_REJECT)
|
|
senderr(EHOSTDOWN);
|
|
|
|
/*
|
|
* We allow this kind of tricky route only
|
|
* when the outgoing interface is p2p.
|
|
* XXX: we may need a more generic rule here.
|
|
*/
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
|
|
senderr(EHOSTUNREACH);
|
|
|
|
goto sendpkt;
|
|
}
|
|
|
|
if (rt->rt_gwroute == 0)
|
|
goto lookup;
|
|
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
|
|
rtfree(rt); rt = rt0;
|
|
lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL);
|
|
if ((rt = rt->rt_gwroute) == 0)
|
|
senderr(EHOSTUNREACH);
|
|
}
|
|
}
|
|
if (rt->rt_flags & RTF_REJECT)
|
|
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
|
|
}
|
|
|
|
/*
|
|
* Address resolution or Neighbor Unreachability Detection
|
|
* for the next hop.
|
|
* At this point, the destination of the packet must be a unicast
|
|
* or an anycast address(i.e. not a multicast).
|
|
*/
|
|
|
|
/* Look up the neighbor cache for the nexthop */
|
|
if (rt && (rt->rt_flags & RTF_LLINFO) != 0)
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
else {
|
|
/*
|
|
* Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
|
|
* the condition below is not very efficient. But we believe
|
|
* it is tolerable, because this should be a rare case.
|
|
*/
|
|
if (nd6_is_addr_neighbor(dst, ifp) &&
|
|
(rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL)
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
}
|
|
if (!ln || !rt) {
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
|
|
!(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) {
|
|
log(LOG_DEBUG,
|
|
"nd6_output: can't allocate llinfo for %s "
|
|
"(ln=%p, rt=%p)\n",
|
|
ip6_sprintf(&dst->sin6_addr), ln, rt);
|
|
senderr(EIO); /* XXX: good error? */
|
|
}
|
|
|
|
goto sendpkt; /* send anyway */
|
|
}
|
|
|
|
/* We don't have to do link-layer address resolution on a p2p link. */
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
|
|
ln->ln_state < ND6_LLINFO_REACHABLE)
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
|
|
/*
|
|
* The first time we send a packet to a neighbor whose entry is
|
|
* STALE, we have to change the state to DELAY and a sets a timer to
|
|
* expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
|
|
* neighbor unreachability detection on expiration.
|
|
* (RFC 2461 7.3.3)
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_STALE) {
|
|
ln->ln_asked = 0;
|
|
ln->ln_state = ND6_LLINFO_DELAY;
|
|
ln->ln_expire = time_second + nd6_delay;
|
|
}
|
|
|
|
/*
|
|
* If the neighbor cache entry has a state other than INCOMPLETE
|
|
* (i.e. its link-layer address is already reloved), just
|
|
* send the packet.
|
|
*/
|
|
if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
|
|
goto sendpkt;
|
|
|
|
/*
|
|
* There is a neighbor cache entry, but no ethernet address
|
|
* response yet. Replace the held mbuf (if any) with this
|
|
* latest one.
|
|
*
|
|
* XXX Does the code conform to rate-limiting rule?
|
|
* (RFC 2461 7.2.2)
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_WAITDELETE ||
|
|
ln->ln_state == ND6_LLINFO_NOSTATE)
|
|
ln->ln_state = ND6_LLINFO_INCOMPLETE;
|
|
if (ln->ln_hold)
|
|
m_freem(ln->ln_hold);
|
|
ln->ln_hold = m;
|
|
if (ln->ln_expire) {
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
if (ln->ln_asked < nd6_mmaxtries &&
|
|
ln->ln_expire < time_second) {
|
|
ln->ln_asked++;
|
|
ln->ln_expire = time_second +
|
|
nd_ifinfo[ifp->if_index].retrans / 1000;
|
|
nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
|
|
}
|
|
}
|
|
return(0);
|
|
|
|
sendpkt:
|
|
|
|
#ifdef FAKE_LOOPBACK_IF
|
|
if (ifp->if_flags & IFF_LOOPBACK) {
|
|
return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
|
|
rt));
|
|
}
|
|
#endif
|
|
return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt));
|
|
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
#undef senderr
|
|
|
|
int
|
|
nd6_storelladdr(ifp, rt, m, dst, desten)
|
|
struct ifnet *ifp;
|
|
struct rtentry *rt;
|
|
struct mbuf *m;
|
|
struct sockaddr *dst;
|
|
u_char *desten;
|
|
{
|
|
struct sockaddr_dl *sdl;
|
|
|
|
if (m->m_flags & M_MCAST) {
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_FDDI:
|
|
ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
|
|
desten);
|
|
return(1);
|
|
break;
|
|
case IFT_ARCNET:
|
|
*desten = 0;
|
|
return(1);
|
|
default:
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
if (rt == NULL ||
|
|
rt->rt_gateway->sa_family != AF_LINK) {
|
|
printf("nd6_storelladdr: something odd happens\n");
|
|
return(0);
|
|
}
|
|
sdl = SDL(rt->rt_gateway);
|
|
if (sdl->sdl_alen == 0) {
|
|
/* this should be impossible, but we bark here for debugging */
|
|
printf("nd6_storelladdr: sdl_alen == 0\n");
|
|
return(0);
|
|
}
|
|
|
|
bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
|
|
return(1);
|
|
}
|