324045a3c2
control whether to accept RAs per-interface basis. the new stuff ensures the backward compatibility; - the kernel does not accept RAs on any interfaces by default. - since the default value of the flag bit is on, the kernel accepts RAs on all interfaces when net.inet6.ip6.accept_rtadv is 1. Obtained from: KAME MFC after: 1 week
1990 lines
53 KiB
C
1990 lines
53 KiB
C
/* $FreeBSD$ */
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/* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei 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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#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/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_types.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/radix.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_ifattach.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 <netinet/icmp6.h>
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#include <netinet6/scope6_var.h>
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#include <net/net_osdep.h>
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#define SDL(s) ((struct sockaddr_dl *)s)
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static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
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static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *,
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struct in6_addr *));
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static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
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struct nd_defrouter *));
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static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
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static void pfxrtr_del __P((struct nd_pfxrouter *));
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static struct nd_pfxrouter *find_pfxlist_reachable_router
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__P((struct nd_prefix *));
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static void defrouter_addifreq __P((struct ifnet *));
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static void nd6_rtmsg __P((int, struct rtentry *));
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static void in6_init_address_ltimes __P((struct nd_prefix *ndpr,
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struct in6_addrlifetime *lt6));
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static int rt6_deleteroute __P((struct radix_node *, void *));
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extern int nd6_recalc_reachtm_interval;
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static struct ifnet *nd6_defifp;
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int nd6_defifindex;
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int ip6_use_tempaddr = 0;
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int ip6_desync_factor;
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u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
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u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
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/*
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* shorter lifetimes for debugging purposes.
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int ip6_temp_preferred_lifetime = 800;
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static int ip6_temp_valid_lifetime = 1800;
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*/
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int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
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/*
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* Receive Router Solicitation Message - just for routers.
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* Router solicitation/advertisement is mostly managed by userland program
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* (rtadvd) so here we have no function like nd6_ra_output().
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*
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* Based on RFC 2461
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*/
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void
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nd6_rs_input(m, off, icmp6len)
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struct mbuf *m;
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int off, icmp6len;
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{
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struct ifnet *ifp = m->m_pkthdr.rcvif;
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_router_solicit *nd_rs;
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struct in6_addr saddr6 = ip6->ip6_src;
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#if 0
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struct in6_addr daddr6 = ip6->ip6_dst;
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#endif
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char *lladdr = NULL;
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int lladdrlen = 0;
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#if 0
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struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
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struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
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struct rtentry *rt = NULL;
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int is_newentry;
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#endif
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union nd_opts ndopts;
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/* If I'm not a router, ignore it. */
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if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
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goto freeit;
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/* Sanity checks */
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if (ip6->ip6_hlim != 255) {
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nd6log((LOG_ERR,
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"nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
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ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
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ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
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goto bad;
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}
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/*
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* Don't update the neighbor cache, if src = ::.
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* This indicates that the src has no IP address assigned yet.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
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goto freeit;
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#ifndef PULLDOWN_TEST
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IP6_EXTHDR_CHECK(m, off, icmp6len,);
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nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
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#else
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IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
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if (nd_rs == NULL) {
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icmp6stat.icp6s_tooshort++;
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return;
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}
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#endif
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icmp6len -= sizeof(*nd_rs);
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nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
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if (nd6_options(&ndopts) < 0) {
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nd6log((LOG_INFO,
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"nd6_rs_input: invalid ND option, ignored\n"));
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/* nd6_options have incremented stats */
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goto freeit;
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}
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if (ndopts.nd_opts_src_lladdr) {
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lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
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lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
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}
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if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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nd6log((LOG_INFO,
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"nd6_rs_input: lladdrlen mismatch for %s "
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"(if %d, RS packet %d)\n",
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ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
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goto bad;
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}
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nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
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freeit:
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m_freem(m);
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return;
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bad:
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icmp6stat.icp6s_badrs++;
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m_freem(m);
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}
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/*
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* Receive Router Advertisement Message.
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*
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* Based on RFC 2461
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* TODO: on-link bit on prefix information
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* TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
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*/
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void
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nd6_ra_input(m, off, icmp6len)
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struct mbuf *m;
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int off, icmp6len;
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{
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struct ifnet *ifp = m->m_pkthdr.rcvif;
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struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_router_advert *nd_ra;
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struct in6_addr saddr6 = ip6->ip6_src;
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#if 0
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struct in6_addr daddr6 = ip6->ip6_dst;
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int flags; /* = nd_ra->nd_ra_flags_reserved; */
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int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
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int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
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#endif
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union nd_opts ndopts;
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struct nd_defrouter *dr;
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/*
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* We only accept RAs only when
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* the system-wide variable allows the acceptance, and
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* per-interface variable allows RAs on the receiving interface.
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*/
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if (ip6_accept_rtadv == 0)
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goto freeit;
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if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
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goto freeit;
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if (ip6->ip6_hlim != 255) {
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nd6log((LOG_ERR,
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"nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
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ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
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ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
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goto bad;
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}
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if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
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nd6log((LOG_ERR,
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"nd6_ra_input: src %s is not link-local\n",
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ip6_sprintf(&saddr6)));
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goto bad;
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}
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#ifndef PULLDOWN_TEST
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IP6_EXTHDR_CHECK(m, off, icmp6len,);
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nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
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#else
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IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
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if (nd_ra == NULL) {
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icmp6stat.icp6s_tooshort++;
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return;
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}
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#endif
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icmp6len -= sizeof(*nd_ra);
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nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
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if (nd6_options(&ndopts) < 0) {
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nd6log((LOG_INFO,
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"nd6_ra_input: invalid ND option, ignored\n"));
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/* nd6_options have incremented stats */
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goto freeit;
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}
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{
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struct nd_defrouter dr0;
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u_int32_t advreachable = nd_ra->nd_ra_reachable;
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dr0.rtaddr = saddr6;
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dr0.flags = nd_ra->nd_ra_flags_reserved;
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dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
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dr0.expire = time_second + dr0.rtlifetime;
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dr0.ifp = ifp;
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dr0.advint = 0; /* Mobile IPv6 */
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dr0.advint_expire = 0; /* Mobile IPv6 */
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dr0.advints_lost = 0; /* Mobile IPv6 */
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/* unspecified or not? (RFC 2461 6.3.4) */
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if (advreachable) {
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advreachable = ntohl(advreachable);
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if (advreachable <= MAX_REACHABLE_TIME &&
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ndi->basereachable != advreachable) {
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ndi->basereachable = advreachable;
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ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
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ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
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}
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}
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if (nd_ra->nd_ra_retransmit)
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ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
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if (nd_ra->nd_ra_curhoplimit)
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ndi->chlim = nd_ra->nd_ra_curhoplimit;
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dr = defrtrlist_update(&dr0);
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}
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|
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/*
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* prefix
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*/
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if (ndopts.nd_opts_pi) {
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struct nd_opt_hdr *pt;
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struct nd_opt_prefix_info *pi = NULL;
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struct nd_prefix pr;
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|
|
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for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
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pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
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pt = (struct nd_opt_hdr *)((caddr_t)pt +
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(pt->nd_opt_len << 3))) {
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if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
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continue;
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pi = (struct nd_opt_prefix_info *)pt;
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|
|
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if (pi->nd_opt_pi_len != 4) {
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nd6log((LOG_INFO,
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|
"nd6_ra_input: invalid option "
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|
"len %d for prefix information option, "
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"ignored\n", pi->nd_opt_pi_len));
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continue;
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}
|
|
|
|
if (128 < pi->nd_opt_pi_prefix_len) {
|
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nd6log((LOG_INFO,
|
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"nd6_ra_input: invalid prefix "
|
|
"len %d for prefix information option, "
|
|
"ignored\n", pi->nd_opt_pi_prefix_len));
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continue;
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|
}
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
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|| IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
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nd6log((LOG_INFO,
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"nd6_ra_input: invalid prefix "
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|
"%s, ignored\n",
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ip6_sprintf(&pi->nd_opt_pi_prefix)));
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continue;
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}
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|
|
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/* aggregatable unicast address, rfc2374 */
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if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
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&& pi->nd_opt_pi_prefix_len != 64) {
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nd6log((LOG_INFO,
|
|
"nd6_ra_input: invalid prefixlen "
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"%d for rfc2374 prefix %s, ignored\n",
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pi->nd_opt_pi_prefix_len,
|
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ip6_sprintf(&pi->nd_opt_pi_prefix)));
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continue;
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}
|
|
|
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bzero(&pr, sizeof(pr));
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pr.ndpr_prefix.sin6_family = AF_INET6;
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pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
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pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
|
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pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
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|
|
|
pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
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ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
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pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
|
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ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
|
|
pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
|
|
pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
|
|
pr.ndpr_pltime =
|
|
ntohl(pi->nd_opt_pi_preferred_time);
|
|
|
|
if (in6_init_prefix_ltimes(&pr))
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continue; /* prefix lifetime init failed */
|
|
|
|
(void)prelist_update(&pr, dr, m);
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|
}
|
|
}
|
|
|
|
/*
|
|
* MTU
|
|
*/
|
|
if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
|
|
u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
|
|
|
|
/* lower bound */
|
|
if (mtu < IPV6_MMTU) {
|
|
nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
|
|
"mtu=%d sent from %s, ignoring\n",
|
|
mtu, ip6_sprintf(&ip6->ip6_src)));
|
|
goto skip;
|
|
}
|
|
|
|
/* upper bound */
|
|
if (ndi->maxmtu) {
|
|
if (mtu <= ndi->maxmtu) {
|
|
int change = (ndi->linkmtu != mtu);
|
|
|
|
ndi->linkmtu = mtu;
|
|
if (change) /* in6_maxmtu may change */
|
|
in6_setmaxmtu();
|
|
} else {
|
|
nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
|
|
"mtu=%d sent from %s; "
|
|
"exceeds maxmtu %d, ignoring\n",
|
|
mtu, ip6_sprintf(&ip6->ip6_src),
|
|
ndi->maxmtu));
|
|
}
|
|
} else {
|
|
nd6log((LOG_INFO, "nd6_ra_input: mtu option "
|
|
"mtu=%d sent from %s; maxmtu unknown, "
|
|
"ignoring\n",
|
|
mtu, ip6_sprintf(&ip6->ip6_src)));
|
|
}
|
|
}
|
|
|
|
skip:
|
|
|
|
/*
|
|
* Source link layer address
|
|
*/
|
|
{
|
|
char *lladdr = NULL;
|
|
int lladdrlen = 0;
|
|
|
|
if (ndopts.nd_opts_src_lladdr) {
|
|
lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
|
|
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
nd6log((LOG_INFO,
|
|
"nd6_ra_input: lladdrlen mismatch for %s "
|
|
"(if %d, RA packet %d)\n",
|
|
ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
|
|
goto bad;
|
|
}
|
|
|
|
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
|
|
|
|
/*
|
|
* Installing a link-layer address might change the state of the
|
|
* router's neighbor cache, which might also affect our on-link
|
|
* detection of adveritsed prefixes.
|
|
*/
|
|
pfxlist_onlink_check();
|
|
}
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return;
|
|
|
|
bad:
|
|
icmp6stat.icp6s_badra++;
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* default router list proccessing sub routines
|
|
*/
|
|
|
|
/* tell the change to user processes watching the routing socket. */
|
|
static void
|
|
nd6_rtmsg(cmd, rt)
|
|
int cmd;
|
|
struct rtentry *rt;
|
|
{
|
|
struct rt_addrinfo info;
|
|
|
|
bzero((caddr_t)&info, sizeof(info));
|
|
info.rti_info[RTAX_DST] = rt_key(rt);
|
|
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
|
|
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
|
|
info.rti_info[RTAX_IFP] =
|
|
(struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
|
|
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
|
|
|
|
rt_missmsg(cmd, &info, rt->rt_flags, 0);
|
|
}
|
|
|
|
void
|
|
defrouter_addreq(new)
|
|
struct nd_defrouter *new;
|
|
{
|
|
struct sockaddr_in6 def, mask, gate;
|
|
struct rtentry *newrt = NULL;
|
|
int s;
|
|
|
|
Bzero(&def, sizeof(def));
|
|
Bzero(&mask, sizeof(mask));
|
|
Bzero(&gate, sizeof(gate));
|
|
|
|
def.sin6_len = mask.sin6_len = gate.sin6_len
|
|
= sizeof(struct sockaddr_in6);
|
|
def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
|
|
gate.sin6_addr = new->rtaddr;
|
|
|
|
s = splnet();
|
|
(void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
|
|
(struct sockaddr *)&gate, (struct sockaddr *)&mask,
|
|
RTF_GATEWAY, &newrt);
|
|
if (newrt) {
|
|
nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
|
|
newrt->rt_refcnt--;
|
|
}
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
/* Add a route to a given interface as default */
|
|
void
|
|
defrouter_addifreq(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct sockaddr_in6 def, mask;
|
|
struct ifaddr *ifa;
|
|
struct rtentry *newrt = NULL;
|
|
int error, flags;
|
|
|
|
bzero(&def, sizeof(def));
|
|
bzero(&mask, sizeof(mask));
|
|
|
|
def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
|
|
def.sin6_family = mask.sin6_family = AF_INET6;
|
|
|
|
/*
|
|
* Search for an ifaddr beloging to the specified interface.
|
|
* XXX: An IPv6 address are required to be assigned on the interface.
|
|
*/
|
|
if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
|
|
nd6log((LOG_ERR, /* better error? */
|
|
"defrouter_addifreq: failed to find an ifaddr "
|
|
"to install a route to interface %s\n",
|
|
if_name(ifp)));
|
|
return;
|
|
}
|
|
|
|
flags = ifa->ifa_flags;
|
|
error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
|
|
(struct sockaddr *)&mask, flags, &newrt);
|
|
if (error != 0) {
|
|
nd6log((LOG_ERR,
|
|
"defrouter_addifreq: failed to install a route to "
|
|
"interface %s (errno = %d)\n",
|
|
if_name(ifp), error));
|
|
|
|
if (newrt) /* maybe unnecessary, but do it for safety */
|
|
newrt->rt_refcnt--;
|
|
} else {
|
|
if (newrt) {
|
|
nd6_rtmsg(RTM_ADD, newrt);
|
|
newrt->rt_refcnt--;
|
|
}
|
|
}
|
|
}
|
|
|
|
struct nd_defrouter *
|
|
defrouter_lookup(addr, ifp)
|
|
struct in6_addr *addr;
|
|
struct ifnet *ifp;
|
|
{
|
|
struct nd_defrouter *dr;
|
|
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry)) {
|
|
if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
|
|
return(dr);
|
|
}
|
|
|
|
return(NULL); /* search failed */
|
|
}
|
|
|
|
void
|
|
defrouter_delreq(dr, dofree)
|
|
struct nd_defrouter *dr;
|
|
int dofree;
|
|
{
|
|
struct sockaddr_in6 def, mask, gate;
|
|
struct rtentry *oldrt = NULL;
|
|
|
|
Bzero(&def, sizeof(def));
|
|
Bzero(&mask, sizeof(mask));
|
|
Bzero(&gate, sizeof(gate));
|
|
|
|
def.sin6_len = mask.sin6_len = gate.sin6_len
|
|
= sizeof(struct sockaddr_in6);
|
|
def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
|
|
gate.sin6_addr = dr->rtaddr;
|
|
|
|
rtrequest(RTM_DELETE, (struct sockaddr *)&def,
|
|
(struct sockaddr *)&gate,
|
|
(struct sockaddr *)&mask,
|
|
RTF_GATEWAY, &oldrt);
|
|
if (oldrt) {
|
|
nd6_rtmsg(RTM_DELETE, oldrt);
|
|
RTFREE(oldrt);
|
|
}
|
|
|
|
if (dofree) /* XXX: necessary? */
|
|
free(dr, M_IP6NDP);
|
|
}
|
|
|
|
void
|
|
defrtrlist_del(dr)
|
|
struct nd_defrouter *dr;
|
|
{
|
|
struct nd_defrouter *deldr = NULL;
|
|
struct nd_prefix *pr;
|
|
|
|
/*
|
|
* Flush all the routing table entries that use the router
|
|
* as a next hop.
|
|
*/
|
|
if (!ip6_forwarding && ip6_accept_rtadv) {
|
|
/* above is a good condition? */
|
|
rt6_flush(&dr->rtaddr, dr->ifp);
|
|
}
|
|
|
|
if (dr == TAILQ_FIRST(&nd_defrouter))
|
|
deldr = dr; /* The router is primary. */
|
|
|
|
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
|
|
|
|
/*
|
|
* Also delete all the pointers to the router in each prefix lists.
|
|
*/
|
|
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
|
|
struct nd_pfxrouter *pfxrtr;
|
|
if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
|
|
pfxrtr_del(pfxrtr);
|
|
}
|
|
pfxlist_onlink_check();
|
|
|
|
/*
|
|
* If the router is the primary one, choose a new one.
|
|
* Note that defrouter_select() will remove the current gateway
|
|
* from the routing table.
|
|
*/
|
|
if (deldr)
|
|
defrouter_select();
|
|
|
|
free(dr, M_IP6NDP);
|
|
}
|
|
|
|
/*
|
|
* Default Router Selection according to Section 6.3.6 of RFC 2461:
|
|
* 1) Routers that are reachable or probably reachable should be
|
|
* preferred.
|
|
* 2) When no routers on the list are known to be reachable or
|
|
* probably reachable, routers SHOULD be selected in a round-robin
|
|
* fashion.
|
|
* 3) If the Default Router List is empty, assume that all
|
|
* destinations are on-link.
|
|
*/
|
|
void
|
|
defrouter_select()
|
|
{
|
|
int s = splnet();
|
|
struct nd_defrouter *dr, anydr;
|
|
struct rtentry *rt = NULL;
|
|
struct llinfo_nd6 *ln = NULL;
|
|
|
|
/*
|
|
* Search for a (probably) reachable router from the list.
|
|
*/
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry)) {
|
|
if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
|
|
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
|
|
ND6_IS_LLINFO_PROBREACH(ln)) {
|
|
/* Got it, and move it to the head */
|
|
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
|
|
TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((dr = TAILQ_FIRST(&nd_defrouter))) {
|
|
/*
|
|
* De-install the previous default gateway and install
|
|
* a new one.
|
|
* Note that if there is no reachable router in the list,
|
|
* the head entry will be used anyway.
|
|
* XXX: do we have to check the current routing table entry?
|
|
*/
|
|
bzero(&anydr, sizeof(anydr));
|
|
defrouter_delreq(&anydr, 0);
|
|
defrouter_addreq(dr);
|
|
}
|
|
else {
|
|
/*
|
|
* The Default Router List is empty, so install the default
|
|
* route to an inteface.
|
|
* XXX: The specification does not say this mechanism should
|
|
* be restricted to hosts, but this would be not useful
|
|
* (even harmful) for routers.
|
|
*/
|
|
if (!ip6_forwarding) {
|
|
/*
|
|
* De-install the current default route
|
|
* in advance.
|
|
*/
|
|
bzero(&anydr, sizeof(anydr));
|
|
defrouter_delreq(&anydr, 0);
|
|
if (nd6_defifp) {
|
|
/*
|
|
* Install a route to the default interface
|
|
* as default route.
|
|
* XXX: we enable this for host only, because
|
|
* this may override a default route installed
|
|
* a user process (e.g. routing daemon) in a
|
|
* router case.
|
|
*/
|
|
defrouter_addifreq(nd6_defifp);
|
|
} else {
|
|
nd6log((LOG_INFO, "defrouter_select: "
|
|
"there's no default router and no default"
|
|
" interface\n"));
|
|
}
|
|
}
|
|
}
|
|
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
static struct nd_defrouter *
|
|
defrtrlist_update(new)
|
|
struct nd_defrouter *new;
|
|
{
|
|
struct nd_defrouter *dr, *n;
|
|
int s = splnet();
|
|
|
|
if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
|
|
/* entry exists */
|
|
if (new->rtlifetime == 0) {
|
|
defrtrlist_del(dr);
|
|
dr = NULL;
|
|
} else {
|
|
/* override */
|
|
dr->flags = new->flags; /* xxx flag check */
|
|
dr->rtlifetime = new->rtlifetime;
|
|
dr->expire = new->expire;
|
|
}
|
|
splx(s);
|
|
return(dr);
|
|
}
|
|
|
|
/* entry does not exist */
|
|
if (new->rtlifetime == 0) {
|
|
splx(s);
|
|
return(NULL);
|
|
}
|
|
|
|
n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
|
|
if (n == NULL) {
|
|
splx(s);
|
|
return(NULL);
|
|
}
|
|
bzero(n, sizeof(*n));
|
|
*n = *new;
|
|
|
|
/*
|
|
* Insert the new router at the end of the Default Router List.
|
|
* If there is no other router, install it anyway. Otherwise,
|
|
* just continue to use the current default router.
|
|
*/
|
|
TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
|
|
if (TAILQ_FIRST(&nd_defrouter) == n)
|
|
defrouter_select();
|
|
splx(s);
|
|
|
|
return(n);
|
|
}
|
|
|
|
static struct nd_pfxrouter *
|
|
pfxrtr_lookup(pr, dr)
|
|
struct nd_prefix *pr;
|
|
struct nd_defrouter *dr;
|
|
{
|
|
struct nd_pfxrouter *search;
|
|
|
|
for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
|
|
if (search->router == dr)
|
|
break;
|
|
}
|
|
|
|
return(search);
|
|
}
|
|
|
|
static void
|
|
pfxrtr_add(pr, dr)
|
|
struct nd_prefix *pr;
|
|
struct nd_defrouter *dr;
|
|
{
|
|
struct nd_pfxrouter *new;
|
|
|
|
new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
|
|
if (new == NULL)
|
|
return;
|
|
bzero(new, sizeof(*new));
|
|
new->router = dr;
|
|
|
|
LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
|
|
|
|
pfxlist_onlink_check();
|
|
}
|
|
|
|
static void
|
|
pfxrtr_del(pfr)
|
|
struct nd_pfxrouter *pfr;
|
|
{
|
|
LIST_REMOVE(pfr, pfr_entry);
|
|
free(pfr, M_IP6NDP);
|
|
}
|
|
|
|
struct nd_prefix *
|
|
nd6_prefix_lookup(pr)
|
|
struct nd_prefix *pr;
|
|
{
|
|
struct nd_prefix *search;
|
|
|
|
for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
|
|
if (pr->ndpr_ifp == search->ndpr_ifp &&
|
|
pr->ndpr_plen == search->ndpr_plen &&
|
|
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
|
|
&search->ndpr_prefix.sin6_addr,
|
|
pr->ndpr_plen)
|
|
) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(search);
|
|
}
|
|
|
|
int
|
|
nd6_prelist_add(pr, dr, newp)
|
|
struct nd_prefix *pr, **newp;
|
|
struct nd_defrouter *dr;
|
|
{
|
|
struct nd_prefix *new = NULL;
|
|
int i, s;
|
|
|
|
new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
|
|
if (new == NULL)
|
|
return ENOMEM;
|
|
bzero(new, sizeof(*new));
|
|
*new = *pr;
|
|
if (newp != NULL)
|
|
*newp = new;
|
|
|
|
/* initilization */
|
|
LIST_INIT(&new->ndpr_advrtrs);
|
|
in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
|
|
/* make prefix in the canonical form */
|
|
for (i = 0; i < 4; i++)
|
|
new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
|
|
new->ndpr_mask.s6_addr32[i];
|
|
|
|
s = splnet();
|
|
/* link ndpr_entry to nd_prefix list */
|
|
LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
|
|
splx(s);
|
|
|
|
/* ND_OPT_PI_FLAG_ONLINK processing */
|
|
if (new->ndpr_raf_onlink) {
|
|
int e;
|
|
|
|
if ((e = nd6_prefix_onlink(new)) != 0) {
|
|
nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
|
|
"the prefix %s/%d on-link on %s (errno=%d)\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
|
|
/* proceed anyway. XXX: is it correct? */
|
|
}
|
|
}
|
|
|
|
if (dr) {
|
|
pfxrtr_add(new, dr);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
prelist_remove(pr)
|
|
struct nd_prefix *pr;
|
|
{
|
|
struct nd_pfxrouter *pfr, *next;
|
|
int e, s;
|
|
|
|
/* make sure to invalidate the prefix until it is really freed. */
|
|
pr->ndpr_vltime = 0;
|
|
pr->ndpr_pltime = 0;
|
|
#if 0
|
|
/*
|
|
* Though these flags are now meaningless, we'd rather keep the value
|
|
* not to confuse users when executing "ndp -p".
|
|
*/
|
|
pr->ndpr_raf_onlink = 0;
|
|
pr->ndpr_raf_auto = 0;
|
|
#endif
|
|
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
|
|
(e = nd6_prefix_offlink(pr)) != 0) {
|
|
nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
|
|
"on %s, errno=%d\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
|
|
/* what should we do? */
|
|
}
|
|
|
|
if (pr->ndpr_refcnt > 0)
|
|
return; /* notice here? */
|
|
|
|
s = splnet();
|
|
|
|
/* unlink ndpr_entry from nd_prefix list */
|
|
LIST_REMOVE(pr, ndpr_entry);
|
|
|
|
/* free list of routers that adversed the prefix */
|
|
for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
|
|
next = pfr->pfr_next;
|
|
|
|
free(pfr, M_IP6NDP);
|
|
}
|
|
splx(s);
|
|
|
|
free(pr, M_IP6NDP);
|
|
|
|
pfxlist_onlink_check();
|
|
}
|
|
|
|
int
|
|
prelist_update(new, dr, m)
|
|
struct nd_prefix *new;
|
|
struct nd_defrouter *dr; /* may be NULL */
|
|
struct mbuf *m;
|
|
{
|
|
struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp = new->ndpr_ifp;
|
|
struct nd_prefix *pr;
|
|
int s = splnet();
|
|
int error = 0;
|
|
int newprefix = 0;
|
|
int auth;
|
|
struct in6_addrlifetime lt6_tmp;
|
|
|
|
auth = 0;
|
|
if (m) {
|
|
/*
|
|
* Authenticity for NA consists authentication for
|
|
* both IP header and IP datagrams, doesn't it ?
|
|
*/
|
|
#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
|
|
auth = (m->m_flags & M_AUTHIPHDR
|
|
&& m->m_flags & M_AUTHIPDGM) ? 1 : 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
if ((pr = nd6_prefix_lookup(new)) != NULL) {
|
|
/*
|
|
* nd6_prefix_lookup() ensures that pr and new have the same
|
|
* prefix on a same interface.
|
|
*/
|
|
|
|
/*
|
|
* Update prefix information. Note that the on-link (L) bit
|
|
* and the autonomous (A) bit should NOT be changed from 1
|
|
* to 0.
|
|
*/
|
|
if (new->ndpr_raf_onlink == 1)
|
|
pr->ndpr_raf_onlink = 1;
|
|
if (new->ndpr_raf_auto == 1)
|
|
pr->ndpr_raf_auto = 1;
|
|
if (new->ndpr_raf_onlink) {
|
|
pr->ndpr_vltime = new->ndpr_vltime;
|
|
pr->ndpr_pltime = new->ndpr_pltime;
|
|
pr->ndpr_preferred = new->ndpr_preferred;
|
|
pr->ndpr_expire = new->ndpr_expire;
|
|
}
|
|
|
|
if (new->ndpr_raf_onlink &&
|
|
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
|
|
int e;
|
|
|
|
if ((e = nd6_prefix_onlink(pr)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"prelist_update: failed to make "
|
|
"the prefix %s/%d on-link on %s "
|
|
"(errno=%d)\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
|
|
/* proceed anyway. XXX: is it correct? */
|
|
}
|
|
}
|
|
|
|
if (dr && pfxrtr_lookup(pr, dr) == NULL)
|
|
pfxrtr_add(pr, dr);
|
|
} else {
|
|
struct nd_prefix *newpr = NULL;
|
|
|
|
newprefix = 1;
|
|
|
|
if (new->ndpr_vltime == 0)
|
|
goto end;
|
|
if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
|
|
goto end;
|
|
|
|
bzero(&new->ndpr_addr, sizeof(struct in6_addr));
|
|
|
|
error = nd6_prelist_add(new, dr, &newpr);
|
|
if (error != 0 || newpr == NULL) {
|
|
nd6log((LOG_NOTICE, "prelist_update: "
|
|
"nd6_prelist_add failed for %s/%d on %s "
|
|
"errno=%d, returnpr=%p\n",
|
|
ip6_sprintf(&new->ndpr_prefix.sin6_addr),
|
|
new->ndpr_plen, if_name(new->ndpr_ifp),
|
|
error, newpr));
|
|
goto end; /* we should just give up in this case. */
|
|
}
|
|
|
|
/*
|
|
* XXX: from the ND point of view, we can ignore a prefix
|
|
* with the on-link bit being zero. However, we need a
|
|
* prefix structure for references from autoconfigured
|
|
* addresses. Thus, we explicitly make suret that the prefix
|
|
* itself expires now.
|
|
*/
|
|
if (newpr->ndpr_raf_onlink == 0) {
|
|
newpr->ndpr_vltime = 0;
|
|
newpr->ndpr_pltime = 0;
|
|
in6_init_prefix_ltimes(newpr);
|
|
}
|
|
|
|
pr = newpr;
|
|
}
|
|
|
|
/*
|
|
* Address autoconfiguration based on Section 5.5.3 of RFC 2462.
|
|
* Note that pr must be non NULL at this point.
|
|
*/
|
|
|
|
/* 5.5.3 (a). Ignore the prefix without the A bit set. */
|
|
if (!new->ndpr_raf_auto)
|
|
goto afteraddrconf;
|
|
|
|
/*
|
|
* 5.5.3 (b). the link-local prefix should have been ignored in
|
|
* nd6_ra_input.
|
|
*/
|
|
|
|
/*
|
|
* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
|
|
* This should have been done in nd6_ra_input.
|
|
*/
|
|
|
|
/*
|
|
* 5.5.3 (d). If the prefix advertised does not match the prefix of an
|
|
* address already in the list, and the Valid Lifetime is not 0,
|
|
* form an address. Note that even a manually configured address
|
|
* should reject autoconfiguration of a new address.
|
|
*/
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
|
|
{
|
|
struct in6_ifaddr *ifa6;
|
|
int ifa_plen;
|
|
u_int32_t storedlifetime;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
/*
|
|
* Spec is not clear here, but I believe we should concentrate
|
|
* on unicast (i.e. not anycast) addresses.
|
|
* XXX: other ia6_flags? detached or duplicated?
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
|
|
continue;
|
|
|
|
ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
|
|
if (ifa_plen != new->ndpr_plen ||
|
|
!in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
|
|
&new->ndpr_prefix.sin6_addr,
|
|
ifa_plen))
|
|
continue;
|
|
|
|
if (ia6_match == NULL) /* remember the first one */
|
|
ia6_match = ifa6;
|
|
|
|
if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* An already autoconfigured address matched. Now that we
|
|
* are sure there is at least one matched address, we can
|
|
* proceed to 5.5.3. (e): update the lifetimes according to the
|
|
* "two hours" rule and the privacy extension.
|
|
*/
|
|
#define TWOHOUR (120*60)
|
|
lt6_tmp = ifa6->ia6_lifetime;
|
|
|
|
if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
|
|
storedlifetime = ND6_INFINITE_LIFETIME;
|
|
else if (IFA6_IS_INVALID(ifa6))
|
|
storedlifetime = 0;
|
|
else
|
|
storedlifetime = lt6_tmp.ia6t_expire - time_second;
|
|
|
|
/* when not updating, keep the current stored lifetime. */
|
|
lt6_tmp.ia6t_vltime = storedlifetime;
|
|
|
|
if (TWOHOUR < new->ndpr_vltime ||
|
|
storedlifetime < new->ndpr_vltime) {
|
|
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
|
|
} else if (storedlifetime <= TWOHOUR
|
|
#if 0
|
|
/*
|
|
* This condition is logically redundant, so we just
|
|
* omit it.
|
|
* See IPng 6712, 6717, and 6721.
|
|
*/
|
|
&& new->ndpr_vltime <= storedlifetime
|
|
#endif
|
|
) {
|
|
if (auth) {
|
|
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
|
|
}
|
|
} else {
|
|
/*
|
|
* new->ndpr_vltime <= TWOHOUR &&
|
|
* TWOHOUR < storedlifetime
|
|
*/
|
|
lt6_tmp.ia6t_vltime = TWOHOUR;
|
|
}
|
|
|
|
/* The 2 hour rule is not imposed for preferred lifetime. */
|
|
lt6_tmp.ia6t_pltime = new->ndpr_pltime;
|
|
|
|
in6_init_address_ltimes(pr, <6_tmp);
|
|
|
|
/*
|
|
* When adjusting the lifetimes of an existing temporary
|
|
* address, only lower the lifetimes.
|
|
* RFC 3041 3.3. (1).
|
|
* XXX: how should we modify ia6t_[pv]ltime?
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
|
|
if (lt6_tmp.ia6t_expire == 0 || /* no expire */
|
|
lt6_tmp.ia6t_expire >
|
|
ifa6->ia6_lifetime.ia6t_expire) {
|
|
lt6_tmp.ia6t_expire =
|
|
ifa6->ia6_lifetime.ia6t_expire;
|
|
}
|
|
if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
|
|
lt6_tmp.ia6t_preferred >
|
|
ifa6->ia6_lifetime.ia6t_preferred) {
|
|
lt6_tmp.ia6t_preferred =
|
|
ifa6->ia6_lifetime.ia6t_preferred;
|
|
}
|
|
}
|
|
|
|
ifa6->ia6_lifetime = lt6_tmp;
|
|
}
|
|
if (ia6_match == NULL && new->ndpr_vltime) {
|
|
/*
|
|
* No address matched and the valid lifetime is non-zero.
|
|
* Create a new address.
|
|
*/
|
|
if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
|
|
/*
|
|
* note that we should use pr (not new) for reference.
|
|
*/
|
|
pr->ndpr_refcnt++;
|
|
ia6->ia6_ndpr = pr;
|
|
|
|
#if 0
|
|
/* XXXYYY Don't do this, according to Jinmei. */
|
|
pr->ndpr_addr = new->ndpr_addr;
|
|
#endif
|
|
|
|
/*
|
|
* RFC 3041 3.3 (2).
|
|
* When a new public address is created as described
|
|
* in RFC2462, also create a new temporary address.
|
|
*
|
|
* RFC 3041 3.5.
|
|
* When an interface connects to a new link, a new
|
|
* randomized interface identifier should be generated
|
|
* immediately together with a new set of temporary
|
|
* addresses. Thus, we specifiy 1 as the 2nd arg of
|
|
* in6_tmpifadd().
|
|
*/
|
|
if (ip6_use_tempaddr) {
|
|
int e;
|
|
if ((e = in6_tmpifadd(ia6, 1)) != 0) {
|
|
nd6log((LOG_NOTICE, "prelist_update: "
|
|
"failed to create a temporary "
|
|
"address, errno=%d\n",
|
|
e));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A newly added address might affect the status
|
|
* of other addresses, so we check and update it.
|
|
* XXX: what if address duplication happens?
|
|
*/
|
|
pfxlist_onlink_check();
|
|
} else {
|
|
/* just set an error. do not bark here. */
|
|
error = EADDRNOTAVAIL; /* XXX: might be unused. */
|
|
}
|
|
}
|
|
|
|
afteraddrconf:
|
|
|
|
end:
|
|
splx(s);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* A supplement function used in the on-link detection below;
|
|
* detect if a given prefix has a (probably) reachable advertising router.
|
|
* XXX: lengthy function name...
|
|
*/
|
|
static struct nd_pfxrouter *
|
|
find_pfxlist_reachable_router(pr)
|
|
struct nd_prefix *pr;
|
|
{
|
|
struct nd_pfxrouter *pfxrtr;
|
|
struct rtentry *rt;
|
|
struct llinfo_nd6 *ln;
|
|
|
|
for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
|
|
pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
|
|
if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
|
|
pfxrtr->router->ifp)) &&
|
|
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
|
|
ND6_IS_LLINFO_PROBREACH(ln))
|
|
break; /* found */
|
|
}
|
|
|
|
return(pfxrtr);
|
|
|
|
}
|
|
|
|
/*
|
|
* Check if each prefix in the prefix list has at least one available router
|
|
* that advertised the prefix (a router is "available" if its neighbor cache
|
|
* entry is reachable or probably reachable).
|
|
* If the check fails, the prefix may be off-link, because, for example,
|
|
* we have moved from the network but the lifetime of the prefix has not
|
|
* expired yet. So we should not use the prefix if there is another prefix
|
|
* that has an available router.
|
|
* But, if there is no prefix that has an available router, we still regards
|
|
* all the prefixes as on-link. This is because we can't tell if all the
|
|
* routers are simply dead or if we really moved from the network and there
|
|
* is no router around us.
|
|
*/
|
|
void
|
|
pfxlist_onlink_check()
|
|
{
|
|
struct nd_prefix *pr;
|
|
struct in6_ifaddr *ifa;
|
|
|
|
/*
|
|
* Check if there is a prefix that has a reachable advertising
|
|
* router.
|
|
*/
|
|
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
|
|
if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
|
|
break;
|
|
}
|
|
|
|
if (pr) {
|
|
/*
|
|
* There is at least one prefix that has a reachable router.
|
|
* Detach prefixes which have no reachable advertising
|
|
* router, and attach other prefixes.
|
|
*/
|
|
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
|
|
/* XXX: a link-local prefix should never be detached */
|
|
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
|
|
continue;
|
|
|
|
/*
|
|
* we aren't interested in prefixes without the L bit
|
|
* set.
|
|
*/
|
|
if (pr->ndpr_raf_onlink == 0)
|
|
continue;
|
|
|
|
if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
|
|
find_pfxlist_reachable_router(pr) == NULL)
|
|
pr->ndpr_stateflags |= NDPRF_DETACHED;
|
|
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
|
|
find_pfxlist_reachable_router(pr) != 0)
|
|
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
|
|
}
|
|
} else {
|
|
/* there is no prefix that has a reachable router */
|
|
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
|
|
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
|
|
continue;
|
|
|
|
if (pr->ndpr_raf_onlink == 0)
|
|
continue;
|
|
|
|
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
|
|
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove each interface route associated with a (just) detached
|
|
* prefix, and reinstall the interface route for a (just) attached
|
|
* prefix. Note that all attempt of reinstallation does not
|
|
* necessarily success, when a same prefix is shared among multiple
|
|
* interfaces. Such cases will be handled in nd6_prefix_onlink,
|
|
* so we don't have to care about them.
|
|
*/
|
|
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
|
|
int e;
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
|
|
continue;
|
|
|
|
if (pr->ndpr_raf_onlink == 0)
|
|
continue;
|
|
|
|
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
|
|
(pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
|
|
if ((e = nd6_prefix_offlink(pr)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"pfxlist_onlink_check: failed to "
|
|
"make %s/%d offlink, errno=%d\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, e));
|
|
}
|
|
}
|
|
if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
|
|
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
|
|
pr->ndpr_raf_onlink) {
|
|
if ((e = nd6_prefix_onlink(pr)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"pfxlist_onlink_check: failed to "
|
|
"make %s/%d offlink, errno=%d\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, e));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Changes on the prefix status might affect address status as well.
|
|
* Make sure that all addresses derived from an attached prefix are
|
|
* attached, and that all addresses derived from a detached prefix are
|
|
* detached. Note, however, that a manually configured address should
|
|
* always be attached.
|
|
* The precise detection logic is same as the one for prefixes.
|
|
*/
|
|
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
|
|
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
|
|
continue;
|
|
|
|
if (ifa->ia6_ndpr == NULL) {
|
|
/*
|
|
* This can happen when we first configure the address
|
|
* (i.e. the address exists, but the prefix does not).
|
|
* XXX: complicated relationships...
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
|
|
break;
|
|
}
|
|
if (ifa) {
|
|
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
|
|
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
|
|
continue;
|
|
|
|
if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
|
|
continue;
|
|
|
|
if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
|
|
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
|
|
else
|
|
ifa->ia6_flags |= IN6_IFF_DETACHED;
|
|
}
|
|
}
|
|
else {
|
|
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
|
|
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
|
|
continue;
|
|
|
|
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
nd6_prefix_onlink(pr)
|
|
struct nd_prefix *pr;
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp = pr->ndpr_ifp;
|
|
struct sockaddr_in6 mask6;
|
|
struct nd_prefix *opr;
|
|
u_long rtflags;
|
|
int error = 0;
|
|
struct rtentry *rt = NULL;
|
|
|
|
/* sanity check */
|
|
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_prefix_onlink: %s/%d is already on-link\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
|
|
return(EEXIST));
|
|
}
|
|
|
|
/*
|
|
* Add the interface route associated with the prefix. Before
|
|
* installing the route, check if there's the same prefix on another
|
|
* interface, and the prefix has already installed the interface route.
|
|
* Although such a configuration is expected to be rare, we explicitly
|
|
* allow it.
|
|
*/
|
|
for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
|
|
if (opr == pr)
|
|
continue;
|
|
|
|
if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
|
|
continue;
|
|
|
|
if (opr->ndpr_plen == pr->ndpr_plen &&
|
|
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
|
|
&opr->ndpr_prefix.sin6_addr,
|
|
pr->ndpr_plen))
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* We prefer link-local addresses as the associated interface address.
|
|
*/
|
|
/* search for a link-local addr */
|
|
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
|
|
IN6_IFF_NOTREADY|
|
|
IN6_IFF_ANYCAST);
|
|
if (ifa == NULL) {
|
|
/* XXX: freebsd does not have ifa_ifwithaf */
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
|
|
{
|
|
if (ifa->ifa_addr->sa_family == AF_INET6)
|
|
break;
|
|
}
|
|
/* should we care about ia6_flags? */
|
|
}
|
|
if (ifa == NULL) {
|
|
/*
|
|
* This can still happen, when, for example, we receive an RA
|
|
* containing a prefix with the L bit set and the A bit clear,
|
|
* after removing all IPv6 addresses on the receiving
|
|
* interface. This should, of course, be rare though.
|
|
*/
|
|
nd6log((LOG_NOTICE,
|
|
"nd6_prefix_onlink: failed to find any ifaddr"
|
|
" to add route for a prefix(%s/%d) on %s\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, if_name(ifp)));
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
|
|
* ifa->ifa_rtrequest = nd6_rtrequest;
|
|
*/
|
|
bzero(&mask6, sizeof(mask6));
|
|
mask6.sin6_len = sizeof(mask6);
|
|
mask6.sin6_addr = pr->ndpr_mask;
|
|
rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
|
|
if (nd6_need_cache(ifp)) {
|
|
/* explicitly set in case ifa_flags does not set the flag. */
|
|
rtflags |= RTF_CLONING;
|
|
} else {
|
|
/*
|
|
* explicitly clear the cloning bit in case ifa_flags sets it.
|
|
*/
|
|
rtflags &= ~RTF_CLONING;
|
|
}
|
|
error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
|
|
ifa->ifa_addr, (struct sockaddr *)&mask6,
|
|
rtflags, &rt);
|
|
if (error == 0) {
|
|
if (rt != NULL) /* this should be non NULL, though */
|
|
nd6_rtmsg(RTM_ADD, rt);
|
|
pr->ndpr_stateflags |= NDPRF_ONLINK;
|
|
}
|
|
else {
|
|
nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
|
|
" prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
|
|
"errno = %d\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
|
|
pr->ndpr_plen, if_name(ifp),
|
|
ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
|
|
ip6_sprintf(&mask6.sin6_addr), rtflags, error));
|
|
}
|
|
|
|
if (rt != NULL)
|
|
rt->rt_refcnt--;
|
|
|
|
return(error);
|
|
}
|
|
|
|
int
|
|
nd6_prefix_offlink(pr)
|
|
struct nd_prefix *pr;
|
|
{
|
|
int error = 0;
|
|
struct ifnet *ifp = pr->ndpr_ifp;
|
|
struct nd_prefix *opr;
|
|
struct sockaddr_in6 sa6, mask6;
|
|
struct rtentry *rt = NULL;
|
|
|
|
/* sanity check */
|
|
if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_prefix_offlink: %s/%d is already off-link\n",
|
|
ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
|
|
return(EEXIST);
|
|
}
|
|
|
|
bzero(&sa6, sizeof(sa6));
|
|
sa6.sin6_family = AF_INET6;
|
|
sa6.sin6_len = sizeof(sa6);
|
|
bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
|
|
sizeof(struct in6_addr));
|
|
bzero(&mask6, sizeof(mask6));
|
|
mask6.sin6_family = AF_INET6;
|
|
mask6.sin6_len = sizeof(sa6);
|
|
bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
|
|
error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
|
|
(struct sockaddr *)&mask6, 0, &rt);
|
|
if (error == 0) {
|
|
pr->ndpr_stateflags &= ~NDPRF_ONLINK;
|
|
|
|
/* report the route deletion to the routing socket. */
|
|
if (rt != NULL)
|
|
nd6_rtmsg(RTM_DELETE, rt);
|
|
|
|
/*
|
|
* There might be the same prefix on another interface,
|
|
* the prefix which could not be on-link just because we have
|
|
* the interface route (see comments in nd6_prefix_onlink).
|
|
* If there's one, try to make the prefix on-link on the
|
|
* interface.
|
|
*/
|
|
for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
|
|
if (opr == pr)
|
|
continue;
|
|
|
|
if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
|
|
continue;
|
|
|
|
/*
|
|
* KAME specific: detached prefixes should not be
|
|
* on-link.
|
|
*/
|
|
if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
|
|
continue;
|
|
|
|
if (opr->ndpr_plen == pr->ndpr_plen &&
|
|
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
|
|
&opr->ndpr_prefix.sin6_addr,
|
|
pr->ndpr_plen)) {
|
|
int e;
|
|
|
|
if ((e = nd6_prefix_onlink(opr)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_prefix_offlink: failed to "
|
|
"recover a prefix %s/%d from %s "
|
|
"to %s (errno = %d)\n",
|
|
ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
|
|
opr->ndpr_plen, if_name(ifp),
|
|
if_name(opr->ndpr_ifp), e));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* XXX: can we still set the NDPRF_ONLINK flag? */
|
|
nd6log((LOG_ERR,
|
|
"nd6_prefix_offlink: failed to delete route: "
|
|
"%s/%d on %s (errno = %d)\n",
|
|
ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
|
|
error));
|
|
}
|
|
|
|
if (rt != NULL)
|
|
RTFREE(rt);
|
|
|
|
return(error);
|
|
}
|
|
|
|
static struct in6_ifaddr *
|
|
in6_ifadd(pr, ifid)
|
|
struct nd_prefix *pr;
|
|
struct in6_addr *ifid; /* Mobile IPv6 addition */
|
|
{
|
|
struct ifnet *ifp = pr->ndpr_ifp;
|
|
struct ifaddr *ifa;
|
|
struct in6_aliasreq ifra;
|
|
struct in6_ifaddr *ia, *ib;
|
|
int error, plen0;
|
|
struct in6_addr mask;
|
|
int prefixlen = pr->ndpr_plen;
|
|
|
|
in6_len2mask(&mask, prefixlen);
|
|
|
|
/*
|
|
* find a link-local address (will be interface ID).
|
|
* Is it really mandatory? Theoretically, a global or a site-local
|
|
* address can be configured without a link-local address, if we
|
|
* have a unique interface identifier...
|
|
*
|
|
* it is not mandatory to have a link-local address, we can generate
|
|
* interface identifier on the fly. we do this because:
|
|
* (1) it should be the easiest way to find interface identifier.
|
|
* (2) RFC2462 5.4 suggesting the use of the same interface identifier
|
|
* for multiple addresses on a single interface, and possible shortcut
|
|
* of DAD. we omitted DAD for this reason in the past.
|
|
* (3) a user can prevent autoconfiguration of global address
|
|
* by removing link-local address by hand (this is partly because we
|
|
* don't have other way to control the use of IPv6 on an interface.
|
|
* this has been our design choice - cf. NRL's "ifconfig auto").
|
|
* (4) it is easier to manage when an interface has addresses
|
|
* with the same interface identifier, than to have multiple addresses
|
|
* with different interface identifiers.
|
|
*
|
|
* Mobile IPv6 addition: allow for caller to specify a wished interface
|
|
* ID. This is to not break connections when moving addresses between
|
|
* interfaces.
|
|
*/
|
|
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
|
|
if (ifa)
|
|
ib = (struct in6_ifaddr *)ifa;
|
|
else
|
|
return NULL;
|
|
|
|
#if 0 /* don't care link local addr state, and always do DAD */
|
|
/* if link-local address is not eligible, do not autoconfigure. */
|
|
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
|
|
printf("in6_ifadd: link-local address not ready\n");
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* prefixlen + ifidlen must be equal to 128 */
|
|
plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
|
|
if (prefixlen != plen0) {
|
|
nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
|
|
"(prefix=%d ifid=%d)\n",
|
|
if_name(ifp), prefixlen, 128 - plen0));
|
|
return NULL;
|
|
}
|
|
|
|
/* make ifaddr */
|
|
|
|
bzero(&ifra, sizeof(ifra));
|
|
/*
|
|
* in6_update_ifa() does not use ifra_name, but we accurately set it
|
|
* for safety.
|
|
*/
|
|
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
|
|
ifra.ifra_addr.sin6_family = AF_INET6;
|
|
ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
|
|
/* prefix */
|
|
bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
|
|
sizeof(ifra.ifra_addr.sin6_addr));
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
|
|
|
|
/* interface ID */
|
|
if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
|
|
ifid = &ib->ia_addr.sin6_addr;
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[0]
|
|
|= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[1]
|
|
|= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[2]
|
|
|= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[3]
|
|
|= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
|
|
|
|
/* new prefix mask. */
|
|
ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_prefixmask.sin6_family = AF_INET6;
|
|
bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
|
|
sizeof(ifra.ifra_prefixmask.sin6_addr));
|
|
|
|
/*
|
|
* lifetime.
|
|
* XXX: in6_init_address_ltimes would override these values later.
|
|
* We should reconsider this logic.
|
|
*/
|
|
ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
|
|
ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
|
|
|
|
/* XXX: scope zone ID? */
|
|
|
|
ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
|
|
/*
|
|
* temporarily set the nopfx flag to avoid conflict.
|
|
* XXX: we should reconsider the entire mechanism about prefix
|
|
* manipulation.
|
|
*/
|
|
ifra.ifra_flags |= IN6_IFF_NOPFX;
|
|
|
|
/*
|
|
* keep the new address, regardless of the result of in6_update_ifa.
|
|
* XXX: this address is now meaningless.
|
|
* We should reconsider its role.
|
|
*/
|
|
pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
|
|
|
|
/* allocate ifaddr structure, link into chain, etc. */
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
|
|
ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
|
|
error));
|
|
return(NULL); /* ifaddr must not have been allocated. */
|
|
}
|
|
|
|
ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
|
|
|
|
return(ia); /* this must NOT be NULL. */
|
|
}
|
|
|
|
int
|
|
in6_tmpifadd(ia0, forcegen)
|
|
const struct in6_ifaddr *ia0; /* corresponding public address */
|
|
int forcegen;
|
|
{
|
|
struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
|
|
struct in6_ifaddr *newia;
|
|
struct in6_aliasreq ifra;
|
|
int i, error;
|
|
int trylimit = 3; /* XXX: adhoc value */
|
|
u_int32_t randid[2];
|
|
time_t vltime0, pltime0;
|
|
|
|
bzero(&ifra, sizeof(ifra));
|
|
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
|
|
ifra.ifra_addr = ia0->ia_addr;
|
|
/* copy prefix mask */
|
|
ifra.ifra_prefixmask = ia0->ia_prefixmask;
|
|
/* clear the old IFID */
|
|
for (i = 0; i < 4; i++) {
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[i]
|
|
&= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
|
|
}
|
|
|
|
again:
|
|
in6_get_tmpifid(ifp, (u_int8_t *)randid,
|
|
(const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
|
|
forcegen);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[2]
|
|
|= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[3]
|
|
|= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
|
|
|
|
/*
|
|
* If by chance the new temporary address is the same as an address
|
|
* already assigned to the interface, generate a new randomized
|
|
* interface identifier and repeat this step.
|
|
* RFC 3041 3.3 (4).
|
|
*/
|
|
if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
|
|
if (trylimit-- == 0) {
|
|
nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
|
|
"a unique random IFID\n"));
|
|
return(EEXIST);
|
|
}
|
|
forcegen = 1;
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* The Valid Lifetime is the lower of the Valid Lifetime of the
|
|
* public address or TEMP_VALID_LIFETIME.
|
|
* The Preferred Lifetime is the lower of the Preferred Lifetime
|
|
* of the public address or TEMP_PREFERRED_LIFETIME -
|
|
* DESYNC_FACTOR.
|
|
*/
|
|
if (ia0->ia6_lifetime.ia6t_expire != 0) {
|
|
vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
|
|
(ia0->ia6_lifetime.ia6t_expire - time_second);
|
|
if (vltime0 > ip6_temp_valid_lifetime)
|
|
vltime0 = ip6_temp_valid_lifetime;
|
|
} else
|
|
vltime0 = ip6_temp_valid_lifetime;
|
|
if (ia0->ia6_lifetime.ia6t_preferred != 0) {
|
|
pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
|
|
(ia0->ia6_lifetime.ia6t_preferred - time_second);
|
|
if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
|
|
pltime0 = ip6_temp_preferred_lifetime -
|
|
ip6_desync_factor;
|
|
}
|
|
} else
|
|
pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
|
|
ifra.ifra_lifetime.ia6t_vltime = vltime0;
|
|
ifra.ifra_lifetime.ia6t_pltime = pltime0;
|
|
|
|
/*
|
|
* A temporary address is created only if this calculated Preferred
|
|
* Lifetime is greater than REGEN_ADVANCE time units.
|
|
*/
|
|
if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
|
|
return(0);
|
|
|
|
/* XXX: scope zone ID? */
|
|
|
|
ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
|
|
|
|
/* allocate ifaddr structure, link into chain, etc. */
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
|
|
return(error);
|
|
|
|
newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
|
|
if (newia == NULL) { /* XXX: can it happen? */
|
|
nd6log((LOG_ERR,
|
|
"in6_tmpifadd: ifa update succeeded, but we got "
|
|
"no ifaddr\n"));
|
|
return(EINVAL); /* XXX */
|
|
}
|
|
newia->ia6_ndpr = ia0->ia6_ndpr;
|
|
newia->ia6_ndpr->ndpr_refcnt++;
|
|
|
|
/*
|
|
* A newly added address might affect the status of other addresses.
|
|
* XXX: when the temporary address is generated with a new public
|
|
* address, the onlink check is redundant. However, it would be safe
|
|
* to do the check explicitly everywhere a new address is generated,
|
|
* and, in fact, we surely need the check when we create a new
|
|
* temporary address due to deprecation of an old temporary address.
|
|
*/
|
|
pfxlist_onlink_check();
|
|
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
in6_init_prefix_ltimes(struct nd_prefix *ndpr)
|
|
{
|
|
/* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
|
|
if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
|
|
nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
|
|
"(%d) is greater than valid lifetime(%d)\n",
|
|
(u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
|
|
return (EINVAL);
|
|
}
|
|
if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
|
|
ndpr->ndpr_preferred = 0;
|
|
else
|
|
ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
|
|
if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
|
|
ndpr->ndpr_expire = 0;
|
|
else
|
|
ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
|
|
{
|
|
/* init ia6t_expire */
|
|
if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
|
|
lt6->ia6t_expire = 0;
|
|
else {
|
|
lt6->ia6t_expire = time_second;
|
|
lt6->ia6t_expire += lt6->ia6t_vltime;
|
|
}
|
|
|
|
/* init ia6t_preferred */
|
|
if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
|
|
lt6->ia6t_preferred = 0;
|
|
else {
|
|
lt6->ia6t_preferred = time_second;
|
|
lt6->ia6t_preferred += lt6->ia6t_pltime;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delete all the routing table entries that use the specified gateway.
|
|
* XXX: this function causes search through all entries of routing table, so
|
|
* it shouldn't be called when acting as a router.
|
|
*/
|
|
void
|
|
rt6_flush(gateway, ifp)
|
|
struct in6_addr *gateway;
|
|
struct ifnet *ifp;
|
|
{
|
|
struct radix_node_head *rnh = rt_tables[AF_INET6];
|
|
int s = splnet();
|
|
|
|
/* We'll care only link-local addresses */
|
|
if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
|
|
splx(s);
|
|
return;
|
|
}
|
|
/* XXX: hack for KAME's link-local address kludge */
|
|
gateway->s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
RADIX_NODE_HEAD_LOCK(rnh);
|
|
rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
|
|
RADIX_NODE_HEAD_UNLOCK(rnh);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
rt6_deleteroute(rn, arg)
|
|
struct radix_node *rn;
|
|
void *arg;
|
|
{
|
|
#define SIN6(s) ((struct sockaddr_in6 *)s)
|
|
struct rtentry *rt = (struct rtentry *)rn;
|
|
struct in6_addr *gate = (struct in6_addr *)arg;
|
|
|
|
if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
|
|
return(0);
|
|
|
|
if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
|
|
return(0);
|
|
|
|
/*
|
|
* Do not delete a static route.
|
|
* XXX: this seems to be a bit ad-hoc. Should we consider the
|
|
* 'cloned' bit instead?
|
|
*/
|
|
if ((rt->rt_flags & RTF_STATIC) != 0)
|
|
return(0);
|
|
|
|
/*
|
|
* We delete only host route. This means, in particular, we don't
|
|
* delete default route.
|
|
*/
|
|
if ((rt->rt_flags & RTF_HOST) == 0)
|
|
return(0);
|
|
|
|
return(rtrequest(RTM_DELETE, rt_key(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
|
|
#undef SIN6
|
|
}
|
|
|
|
int
|
|
nd6_setdefaultiface(ifindex)
|
|
int ifindex;
|
|
{
|
|
int error = 0;
|
|
|
|
if (ifindex < 0 || if_index < ifindex)
|
|
return(EINVAL);
|
|
|
|
if (nd6_defifindex != ifindex) {
|
|
nd6_defifindex = ifindex;
|
|
if (nd6_defifindex > 0)
|
|
nd6_defifp = ifnet_byindex(nd6_defifindex);
|
|
else
|
|
nd6_defifp = NULL;
|
|
|
|
/*
|
|
* If the Default Router List is empty, install a route
|
|
* to the specified interface as default or remove the default
|
|
* route when the default interface becomes canceled.
|
|
* The check for the queue is actually redundant, but
|
|
* we do this here to avoid re-install the default route
|
|
* if the list is NOT empty.
|
|
*/
|
|
if (TAILQ_FIRST(&nd_defrouter) == NULL)
|
|
defrouter_select();
|
|
|
|
/*
|
|
* Our current implementation assumes one-to-one maping between
|
|
* interfaces and links, so it would be natural to use the
|
|
* default interface as the default link.
|
|
*/
|
|
scope6_setdefault(nd6_defifp);
|
|
}
|
|
|
|
return(error);
|
|
}
|