2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
44 #include <sys/refcount.h>
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
48 #include <sys/kernel.h>
50 #include <sys/errno.h>
51 #include <sys/rmlock.h>
52 #include <sys/rwlock.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
55 #include <sys/queue.h>
58 #include <net/if_var.h>
59 #include <net/if_types.h>
60 #include <net/if_dl.h>
61 #include <net/route.h>
62 #include <net/route/nhop.h>
63 #include <net/route/route_var.h>
64 #include <net/radix.h>
67 #include <netinet/in.h>
68 #include <net/if_llatbl.h>
69 #include <netinet6/in6_var.h>
70 #include <netinet6/in6_ifattach.h>
71 #include <netinet/ip6.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet6/nd6.h>
74 #include <netinet/icmp6.h>
75 #include <netinet6/scope6_var.h>
77 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
78 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
80 static int nd6_prefix_onlink(struct nd_prefix *);
82 TAILQ_HEAD(nd6_drhead, nd_defrouter);
83 VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter);
84 #define V_nd6_defrouter VNET(nd6_defrouter)
86 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
87 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
89 VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp);
90 VNET_DEFINE(int, nd6_defifindex);
91 #define V_nd6_defifp VNET(nd6_defifp)
93 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
95 VNET_DEFINE(int, ip6_desync_factor);
96 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
97 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
99 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
102 VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
105 SYSCTL_DECL(_net_inet6_icmp6);
107 /* RTPREF_MEDIUM has to be 0! */
108 #define RTPREF_HIGH 1
109 #define RTPREF_MEDIUM 0
110 #define RTPREF_LOW (-1)
111 #define RTPREF_RESERVED (-2)
112 #define RTPREF_INVALID (-3) /* internal */
115 defrouter_ref(struct nd_defrouter *dr)
118 refcount_acquire(&dr->refcnt);
122 defrouter_rele(struct nd_defrouter *dr)
125 if (refcount_release(&dr->refcnt))
130 * Remove a router from the global list and optionally stash it in a
131 * caller-supplied queue.
134 defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq)
139 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
142 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
146 * Receive Router Solicitation Message - just for routers.
147 * Router solicitation/advertisement is mostly managed by userland program
148 * (rtadvd) so here we have no function like nd6_ra_output().
153 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
157 struct nd_router_solicit *nd_rs;
158 struct in6_addr saddr6;
159 union nd_opts ndopts;
160 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
164 ifp = m->m_pkthdr.rcvif;
167 * Accept RS only when V_ip6_forwarding=1 and the interface has
168 * no ND6_IFF_ACCEPT_RTADV.
170 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
173 /* RFC 6980: Nodes MUST silently ignore fragments */
174 if(m->m_flags & M_FRAGMENTED)
178 ip6 = mtod(m, struct ip6_hdr *);
179 if (ip6->ip6_hlim != 255) {
181 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
182 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
183 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
188 * Don't update the neighbor cache, if src = ::.
189 * This indicates that the src has no IP address assigned yet.
191 saddr6 = ip6->ip6_src;
192 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
195 if (m->m_len < off + icmp6len) {
196 m = m_pullup(m, off + icmp6len);
198 IP6STAT_INC(ip6s_exthdrtoolong);
202 ip6 = mtod(m, struct ip6_hdr *);
203 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
205 icmp6len -= sizeof(*nd_rs);
206 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
207 if (nd6_options(&ndopts) < 0) {
209 "%s: invalid ND option, ignored\n", __func__));
210 /* nd6_options have incremented stats */
216 if (ndopts.nd_opts_src_lladdr) {
217 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
218 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
221 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
223 "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n",
224 __func__, ip6_sprintf(ip6bufs, &saddr6),
225 ifp->if_addrlen, lladdrlen - 2));
229 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
236 ICMP6STAT_INC(icp6s_badrs);
242 * An initial update routine for draft-ietf-6man-ipv6only-flag.
243 * We need to iterate over all default routers for the given
244 * interface to see whether they are all advertising the "S"
245 * (IPv6-Only) flag. If they do set, otherwise unset, the
246 * interface flag we later use to filter on.
249 defrtr_ipv6_only_ifp(struct ifnet *ifp)
251 struct nd_defrouter *dr;
252 bool ipv6_only, ipv6_only_old;
254 struct epoch_tracker et;
259 if (V_nd6_ignore_ipv6_only_ra != 0)
264 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
265 if (dr->ifp == ifp &&
266 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
270 IF_AFDATA_WLOCK(ifp);
271 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
272 IF_AFDATA_WUNLOCK(ifp);
274 /* If nothing changed, we have an early exit. */
275 if (ipv6_only == ipv6_only_old)
280 * Should we want to set the IPV6-ONLY flag, check if the
281 * interface has a non-0/0 and non-link-local IPv4 address
282 * configured on it. If it has we will assume working
283 * IPv4 operations and will clear the interface flag.
285 has_ipv4_addr = false;
288 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
289 if (ifa->ifa_addr->sa_family != AF_INET)
292 satosin(ifa->ifa_addr)->sin_addr)) {
293 has_ipv4_addr = true;
299 if (ipv6_only && has_ipv4_addr) {
300 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
301 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
306 IF_AFDATA_WLOCK(ifp);
308 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
310 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
311 IF_AFDATA_WUNLOCK(ifp);
314 /* Send notification of flag change. */
319 defrtr_ipv6_only_ipf_down(struct ifnet *ifp)
322 IF_AFDATA_WLOCK(ifp);
323 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
324 IF_AFDATA_WUNLOCK(ifp);
326 #endif /* EXPERIMENTAL */
329 nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
333 * XXX-BZ we might want to trigger re-evaluation of our default router
334 * availability. E.g., on link down the default router might be
335 * unreachable but a different interface might still have connectivity.
339 if (linkstate == LINK_STATE_DOWN)
340 defrtr_ipv6_only_ipf_down(ifp);
345 * Receive Router Advertisement Message.
348 * TODO: on-link bit on prefix information
349 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
352 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
355 struct nd_ifinfo *ndi;
357 struct nd_router_advert *nd_ra;
358 struct in6_addr saddr6;
359 struct nd_defrouter *dr;
360 union nd_opts ndopts;
361 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
365 * We only accept RAs only when the per-interface flag
366 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
368 ifp = m->m_pkthdr.rcvif;
369 ndi = ND_IFINFO(ifp);
370 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
373 /* RFC 6980: Nodes MUST silently ignore fragments */
374 if(m->m_flags & M_FRAGMENTED)
377 ip6 = mtod(m, struct ip6_hdr *);
378 if (ip6->ip6_hlim != 255) {
380 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
381 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
382 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
386 saddr6 = ip6->ip6_src;
387 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
389 "%s: src %s is not link-local\n", __func__,
390 ip6_sprintf(ip6bufs, &saddr6)));
394 if (m->m_len < off + icmp6len) {
395 m = m_pullup(m, off + icmp6len);
397 IP6STAT_INC(ip6s_exthdrtoolong);
401 ip6 = mtod(m, struct ip6_hdr *);
402 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
404 icmp6len -= sizeof(*nd_ra);
405 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
406 if (nd6_options(&ndopts) < 0) {
408 "%s: invalid ND option, ignored\n", __func__));
409 /* nd6_options have incremented stats */
416 struct nd_defrouter dr0;
417 u_int32_t advreachable = nd_ra->nd_ra_reachable;
419 /* remember if this is a multicasted advertisement */
420 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
423 bzero(&dr0, sizeof(dr0));
425 dr0.raflags = nd_ra->nd_ra_flags_reserved;
427 * Effectively-disable routes from RA messages when
428 * ND6_IFF_NO_RADR enabled on the receiving interface or
429 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
431 if (ndi->flags & ND6_IFF_NO_RADR)
433 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
436 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
437 dr0.expire = time_uptime + dr0.rtlifetime;
439 /* unspecified or not? (RFC 2461 6.3.4) */
441 advreachable = ntohl(advreachable);
442 if (advreachable <= MAX_REACHABLE_TIME &&
443 ndi->basereachable != advreachable) {
444 ndi->basereachable = advreachable;
445 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
446 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
449 if (nd_ra->nd_ra_retransmit)
450 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
451 if (nd_ra->nd_ra_curhoplimit) {
452 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
453 ndi->chlim = nd_ra->nd_ra_curhoplimit;
454 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
455 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
456 "%s on %s (current = %d, received = %d). "
457 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
458 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
461 dr = defrtrlist_update(&dr0);
463 defrtr_ipv6_only_ifp(ifp);
470 if (ndopts.nd_opts_pi) {
471 struct nd_opt_hdr *pt;
472 struct nd_opt_prefix_info *pi = NULL;
473 struct nd_prefixctl pr;
475 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
476 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
477 pt = (struct nd_opt_hdr *)((caddr_t)pt +
478 (pt->nd_opt_len << 3))) {
479 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
481 pi = (struct nd_opt_prefix_info *)pt;
483 if (pi->nd_opt_pi_len != 4) {
485 "%s: invalid option len %d for prefix "
486 "information option, ignored\n", __func__,
491 if (128 < pi->nd_opt_pi_prefix_len) {
493 "%s: invalid prefix len %d for prefix "
494 "information option, ignored\n", __func__,
495 pi->nd_opt_pi_prefix_len));
499 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
500 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
502 "%s: invalid prefix %s, ignored\n",
503 __func__, ip6_sprintf(ip6bufs,
504 &pi->nd_opt_pi_prefix)));
508 bzero(&pr, sizeof(pr));
509 pr.ndpr_prefix.sin6_family = AF_INET6;
510 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
511 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
512 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
514 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
515 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
516 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
517 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
518 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
519 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
520 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
521 (void)prelist_update(&pr, dr, m, mcast);
532 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
536 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
539 if (mtu < IPV6_MMTU) {
540 nd6log((LOG_INFO, "%s: bogus mtu option mtu=%lu sent "
541 "from %s, ignoring\n", __func__,
542 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
547 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
548 ? ndi->maxmtu : ifp->if_mtu;
550 int change = (ndi->linkmtu != mtu);
554 /* in6_maxmtu may change */
559 nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; "
560 "exceeds maxmtu %lu, ignoring\n", __func__,
561 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
568 * Source link layer address
574 if (ndopts.nd_opts_src_lladdr) {
575 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
576 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
579 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
581 "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n",
582 __func__, ip6_sprintf(ip6bufs, &saddr6),
583 ifp->if_addrlen, lladdrlen - 2));
587 nd6_cache_lladdr(ifp, &saddr6, lladdr,
588 lladdrlen, ND_ROUTER_ADVERT, 0);
591 * Installing a link-layer address might change the state of the
592 * router's neighbor cache, which might also affect our on-link
593 * detection of adveritsed prefixes.
595 pfxlist_onlink_check();
603 ICMP6STAT_INC(icp6s_badra);
608 static struct nd_pfxrouter *
609 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
611 struct nd_pfxrouter *search;
615 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
616 if (search->router == dr)
623 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
625 struct nd_pfxrouter *new;
631 if (pfxrtr_lookup(pr, dr) != NULL) {
637 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
644 if (pfxrtr_lookup(pr, dr) == NULL) {
645 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
648 /* We lost a race to add the reference. */
656 pfxlist_onlink_check();
660 pfxrtr_del(struct nd_pfxrouter *pfr)
665 LIST_REMOVE(pfr, pfr_entry);
666 defrouter_rele(pfr->router);
671 /* Default router list processing sub routines. */
673 defrouter_addreq(struct nd_defrouter *new)
675 struct sockaddr_in6 def, mask, gate;
676 struct rtentry *newrt = NULL;
680 bzero(&def, sizeof(def));
681 bzero(&mask, sizeof(mask));
682 bzero(&gate, sizeof(gate));
684 def.sin6_len = mask.sin6_len = gate.sin6_len =
685 sizeof(struct sockaddr_in6);
686 def.sin6_family = gate.sin6_family = AF_INET6;
687 gate.sin6_addr = new->rtaddr;
688 fibnum = new->ifp->if_fib;
690 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
691 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
692 RTF_GATEWAY, &newrt, fibnum);
694 rt_routemsg(RTM_ADD, newrt, new->ifp, 0, fibnum);
700 * Remove the default route for a given router.
701 * This is just a subroutine function for defrouter_select_fib(), and
702 * should not be called from anywhere else.
705 defrouter_delreq(struct nd_defrouter *dr)
707 struct sockaddr_in6 def, mask, gate;
708 struct rtentry *oldrt = NULL;
709 struct epoch_tracker et;
712 bzero(&def, sizeof(def));
713 bzero(&mask, sizeof(mask));
714 bzero(&gate, sizeof(gate));
716 def.sin6_len = mask.sin6_len = gate.sin6_len =
717 sizeof(struct sockaddr_in6);
718 def.sin6_family = gate.sin6_family = AF_INET6;
719 gate.sin6_addr = dr->rtaddr;
720 fibnum = dr->ifp->if_fib;
723 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
724 (struct sockaddr *)&gate,
725 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, fibnum);
727 rt_routemsg(RTM_DELETE, oldrt, dr->ifp, 0, fibnum);
734 defrouter_del(struct nd_defrouter *dr)
736 struct nd_defrouter *deldr = NULL;
737 struct nd_prefix *pr;
738 struct nd_pfxrouter *pfxrtr;
743 * Flush all the routing table entries that use the router
746 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
747 rt6_flush(&dr->rtaddr, dr->ifp);
750 defrtr_ipv6_only_ifp(dr->ifp);
755 defrouter_delreq(dr);
759 * Also delete all the pointers to the router in each prefix lists.
762 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
763 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
768 pfxlist_onlink_check();
771 * If the router is the primary one, choose a new one.
772 * Note that defrouter_select_fib() will remove the current
773 * gateway from the routing table.
776 defrouter_select_fib(deldr->ifp->if_fib);
779 * Release the list reference.
785 struct nd_defrouter *
786 defrouter_lookup_locked(const struct in6_addr *addr, struct ifnet *ifp)
788 struct nd_defrouter *dr;
791 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
792 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
799 struct nd_defrouter *
800 defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp)
802 struct nd_defrouter *dr;
805 dr = defrouter_lookup_locked(addr, ifp);
811 * Remove all default routes from default router list.
814 defrouter_reset(void)
816 struct nd_defrouter *dr, **dra;
822 * We can't delete routes with the ND lock held, so make a copy of the
823 * current default router list and use that when deleting routes.
826 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
830 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
833 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
841 for (i = 0; i < count && dra[i] != NULL; i++) {
842 defrouter_delreq(dra[i]);
843 defrouter_rele(dra[i]);
848 * XXX should we also nuke any default routers in the kernel, by
849 * going through them by rtalloc1()?
854 * Look up a matching default router list entry and remove it. Returns true if a
855 * matching entry was found, false otherwise.
858 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
860 struct nd_defrouter *dr;
863 dr = defrouter_lookup_locked(addr, ifp);
869 defrouter_unlink(dr, NULL);
877 * for default router selection
878 * regards router-preference field as a 2-bit signed integer
881 rtpref(struct nd_defrouter *dr)
883 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
884 case ND_RA_FLAG_RTPREF_HIGH:
885 return (RTPREF_HIGH);
886 case ND_RA_FLAG_RTPREF_MEDIUM:
887 case ND_RA_FLAG_RTPREF_RSV:
888 return (RTPREF_MEDIUM);
889 case ND_RA_FLAG_RTPREF_LOW:
893 * This case should never happen. If it did, it would mean a
894 * serious bug of kernel internal. We thus always bark here.
895 * Or, can we even panic?
897 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
898 return (RTPREF_INVALID);
904 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
905 * draft-ietf-ipngwg-router-selection:
906 * 1) Routers that are reachable or probably reachable should be preferred.
907 * If we have more than one (probably) reachable router, prefer ones
908 * with the highest router preference.
909 * 2) When no routers on the list are known to be reachable or
910 * probably reachable, routers SHOULD be selected in a round-robin
911 * fashion, regardless of router preference values.
912 * 3) If the Default Router List is empty, assume that all
913 * destinations are on-link.
915 * We assume nd_defrouter is sorted by router preference value.
916 * Since the code below covers both with and without router preference cases,
917 * we do not need to classify the cases by ifdef.
919 * At this moment, we do not try to install more than one default router,
920 * even when the multipath routing is available, because we're not sure about
921 * the benefits for stub hosts comparing to the risk of making the code
922 * complicated and the possibility of introducing bugs.
924 * We maintain a single list of routers for multiple FIBs, only considering one
925 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
926 * we do the whole thing multiple times.
929 defrouter_select_fib(int fibnum)
931 struct epoch_tracker et;
932 struct nd_defrouter *dr, *selected_dr, *installed_dr;
933 struct llentry *ln = NULL;
935 if (fibnum == RT_ALL_FIBS) {
936 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
937 defrouter_select_fib(fibnum);
943 * Let's handle easy case (3) first:
944 * If default router list is empty, there's nothing to be done.
946 if (TAILQ_EMPTY(&V_nd6_defrouter)) {
952 * Search for a (probably) reachable router from the list.
953 * We just pick up the first reachable one (if any), assuming that
954 * the ordering rule of the list described in defrtrlist_update().
956 selected_dr = installed_dr = NULL;
957 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
959 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
960 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
961 ND6_IS_LLINFO_PROBREACH(ln)) {
963 defrouter_ref(selected_dr);
971 if (dr->installed && dr->ifp->if_fib == fibnum) {
972 if (installed_dr == NULL) {
974 defrouter_ref(installed_dr);
977 * this should not happen.
978 * warn for diagnosis.
980 log(LOG_ERR, "defrouter_select_fib: more than "
981 "one router is installed\n");
986 * If none of the default routers was found to be reachable,
987 * round-robin the list regardless of preference.
988 * Otherwise, if we have an installed router, check if the selected
989 * (reachable) router should really be preferred to the installed one.
990 * We only prefer the new router when the old one is not reachable
991 * or when the new one has a really higher preference value.
993 if (selected_dr == NULL) {
994 if (installed_dr == NULL ||
995 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
996 dr = TAILQ_FIRST(&V_nd6_defrouter);
998 dr = TAILQ_NEXT(installed_dr, dr_entry);
1000 /* Ensure we select a router for this FIB. */
1001 TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) {
1002 if (dr->ifp->if_fib == fibnum) {
1004 defrouter_ref(selected_dr);
1008 } else if (installed_dr != NULL) {
1009 NET_EPOCH_ENTER(et);
1010 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
1011 installed_dr->ifp)) &&
1012 ND6_IS_LLINFO_PROBREACH(ln) &&
1013 installed_dr->ifp->if_fib == fibnum &&
1014 rtpref(selected_dr) <= rtpref(installed_dr)) {
1015 defrouter_rele(selected_dr);
1016 selected_dr = installed_dr;
1024 NET_EPOCH_ENTER(et);
1026 * If we selected a router for this FIB and it's different
1027 * than the installed one, remove the installed router and
1028 * install the selected one in its place.
1030 if (installed_dr != selected_dr) {
1031 if (installed_dr != NULL) {
1032 defrouter_delreq(installed_dr);
1033 defrouter_rele(installed_dr);
1035 if (selected_dr != NULL)
1036 defrouter_addreq(selected_dr);
1038 if (selected_dr != NULL)
1039 defrouter_rele(selected_dr);
1043 static struct nd_defrouter *
1044 defrtrlist_update(struct nd_defrouter *new)
1046 struct nd_defrouter *dr, *n;
1051 if (new->rtlifetime == 0) {
1052 defrouter_remove(&new->rtaddr, new->ifp);
1057 writelocked = false;
1059 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
1061 oldpref = rtpref(dr);
1064 dr->raflags = new->raflags; /* XXX flag check */
1065 dr->rtlifetime = new->rtlifetime;
1066 dr->expire = new->expire;
1069 * If the preference does not change, there's no need
1070 * to sort the entries. Also make sure the selected
1071 * router is still installed in the kernel.
1073 if (dr->installed && rtpref(new) == oldpref) {
1083 * The router needs to be reinserted into the default router
1084 * list, so upgrade to a write lock. If that fails and the list
1085 * has potentially changed while the lock was dropped, we'll
1086 * redo the lookup with the write lock held.
1090 if (!ND6_TRY_UPGRADE()) {
1091 genid = V_nd6_list_genid;
1094 if (genid != V_nd6_list_genid)
1101 * The preferred router may have changed, so relocate this
1104 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
1107 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1112 memcpy(n, new, sizeof(*n));
1113 /* Initialize with an extra reference for the caller. */
1114 refcount_init(&n->refcnt, 2);
1118 * Insert the new router in the Default Router List;
1119 * The Default Router List should be in the descending order
1120 * of router-preferece. Routers with the same preference are
1121 * sorted in the arriving time order.
1124 /* insert at the end of the group */
1125 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1126 if (rtpref(n) > rtpref(dr))
1130 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1132 TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry);
1136 defrouter_select_fib(new->ifp->if_fib);
1142 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1144 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1145 ndpr->ndpr_preferred = 0;
1147 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1148 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1149 ndpr->ndpr_expire = 0;
1151 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1157 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1159 /* init ia6t_expire */
1160 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1161 lt6->ia6t_expire = 0;
1163 lt6->ia6t_expire = time_uptime;
1164 lt6->ia6t_expire += lt6->ia6t_vltime;
1167 /* init ia6t_preferred */
1168 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1169 lt6->ia6t_preferred = 0;
1171 lt6->ia6t_preferred = time_uptime;
1172 lt6->ia6t_preferred += lt6->ia6t_pltime;
1176 static struct in6_ifaddr *
1177 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1179 struct ifnet *ifp = pr->ndpr_ifp;
1181 struct in6_aliasreq ifra;
1182 struct in6_ifaddr *ia, *ib;
1184 struct in6_addr mask;
1185 int prefixlen = pr->ndpr_plen;
1187 char ip6buf[INET6_ADDRSTRLEN];
1189 in6_prefixlen2mask(&mask, prefixlen);
1192 * find a link-local address (will be interface ID).
1193 * Is it really mandatory? Theoretically, a global or a site-local
1194 * address can be configured without a link-local address, if we
1195 * have a unique interface identifier...
1197 * it is not mandatory to have a link-local address, we can generate
1198 * interface identifier on the fly. we do this because:
1199 * (1) it should be the easiest way to find interface identifier.
1200 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1201 * for multiple addresses on a single interface, and possible shortcut
1202 * of DAD. we omitted DAD for this reason in the past.
1203 * (3) a user can prevent autoconfiguration of global address
1204 * by removing link-local address by hand (this is partly because we
1205 * don't have other way to control the use of IPv6 on an interface.
1206 * this has been our design choice - cf. NRL's "ifconfig auto").
1207 * (4) it is easier to manage when an interface has addresses
1208 * with the same interface identifier, than to have multiple addresses
1209 * with different interface identifiers.
1211 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1213 ib = (struct in6_ifaddr *)ifa;
1217 /* prefixlen + ifidlen must be equal to 128 */
1218 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1219 if (prefixlen != plen0) {
1222 "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n",
1223 __func__, if_name(ifp), prefixlen, 128 - plen0));
1228 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
1230 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
1232 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1233 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1234 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1235 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1236 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1237 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1238 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1239 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1243 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1244 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1246 /* XXX: scope zone ID? */
1248 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1251 * Make sure that we do not have this address already. This should
1252 * usually not happen, but we can still see this case, e.g., if we
1253 * have manually configured the exact address to be configured.
1255 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1256 &ifra.ifra_addr.sin6_addr);
1259 /* this should be rare enough to make an explicit log */
1260 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1261 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1266 * Allocate ifaddr structure, link into chain, etc.
1267 * If we are going to create a new address upon receiving a multicasted
1268 * RA, we need to impose a random delay before starting DAD.
1269 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1273 updateflags |= IN6_IFAUPDATE_DADDELAY;
1274 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1276 "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__,
1277 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1278 if_name(ifp), error));
1279 return (NULL); /* ifaddr must not have been allocated. */
1282 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1284 * XXXRW: Assumption of non-NULLness here might not be true with
1285 * fine-grained locking -- should we validate it? Or just return
1286 * earlier ifa rather than looking it up again?
1288 return (ia); /* this is always non-NULL and referenced. */
1291 static struct nd_prefix *
1292 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1294 struct nd_prefix *search;
1298 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1299 if (key->ndpr_ifp == search->ndpr_ifp &&
1300 key->ndpr_plen == search->ndpr_plen &&
1301 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1302 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1303 nd6_prefix_ref(search);
1311 nd6_prefix_lookup(struct nd_prefixctl *key)
1313 struct nd_prefix *search;
1316 search = nd6_prefix_lookup_locked(key);
1322 nd6_prefix_ref(struct nd_prefix *pr)
1325 refcount_acquire(&pr->ndpr_refcnt);
1329 nd6_prefix_rele(struct nd_prefix *pr)
1332 if (refcount_release(&pr->ndpr_refcnt)) {
1333 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1334 ("prefix %p has advertising routers", pr));
1340 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1341 struct nd_prefix **newp)
1343 struct nd_prefix *new;
1344 char ip6buf[INET6_ADDRSTRLEN];
1347 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1350 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1351 new->ndpr_ifp = pr->ndpr_ifp;
1352 new->ndpr_prefix = pr->ndpr_prefix;
1353 new->ndpr_plen = pr->ndpr_plen;
1354 new->ndpr_vltime = pr->ndpr_vltime;
1355 new->ndpr_pltime = pr->ndpr_pltime;
1356 new->ndpr_flags = pr->ndpr_flags;
1357 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1358 free(new, M_IP6NDP);
1361 new->ndpr_lastupdate = time_uptime;
1363 /* initialization */
1364 LIST_INIT(&new->ndpr_advrtrs);
1365 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1366 /* make prefix in the canonical form */
1367 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1370 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1374 /* ND_OPT_PI_FLAG_ONLINK processing */
1375 if (new->ndpr_raf_onlink) {
1376 struct epoch_tracker et;
1379 NET_EPOCH_ENTER(et);
1380 if ((error = nd6_prefix_onlink(new)) != 0) {
1381 nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d "
1382 "on-link on %s (errno=%d)\n", __func__,
1383 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1384 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1385 /* proceed anyway. XXX: is it correct? */
1388 ND6_ONLINK_UNLOCK();
1392 pfxrtr_add(new, dr);
1399 * Remove a prefix from the prefix list and optionally stash it in a
1400 * caller-provided list.
1402 * The ND6 lock must be held.
1405 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1410 LIST_REMOVE(pr, ndpr_entry);
1413 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1417 * Free an unlinked prefix, first marking it off-link if necessary.
1420 nd6_prefix_del(struct nd_prefix *pr)
1422 struct nd_pfxrouter *pfr, *next;
1424 char ip6buf[INET6_ADDRSTRLEN];
1426 KASSERT(pr->ndpr_addrcnt == 0,
1427 ("prefix %p has referencing addresses", pr));
1428 ND6_UNLOCK_ASSERT();
1431 * Though these flags are now meaningless, we'd rather keep the value
1432 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1433 * when executing "ndp -p".
1435 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1437 if ((e = nd6_prefix_offlink(pr)) != 0) {
1439 "%s: failed to make the prefix %s/%d offlink on %s "
1440 "(errno=%d)\n", __func__,
1441 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1442 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1443 /* what should we do? */
1445 ND6_ONLINK_UNLOCK();
1448 /* Release references to routers that have advertised this prefix. */
1450 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1454 nd6_prefix_rele(pr);
1456 pfxlist_onlink_check();
1460 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1461 struct mbuf *m, int mcast)
1463 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1465 struct ifnet *ifp = new->ndpr_ifp;
1466 struct nd_prefix *pr;
1469 struct in6_addrlifetime lt6_tmp;
1470 char ip6buf[INET6_ADDRSTRLEN];
1477 * Authenticity for NA consists authentication for
1478 * both IP header and IP datagrams, doesn't it ?
1480 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1481 auth = ((m->m_flags & M_AUTHIPHDR) &&
1482 (m->m_flags & M_AUTHIPDGM));
1486 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1488 * nd6_prefix_lookup() ensures that pr and new have the same
1489 * prefix on a same interface.
1493 * Update prefix information. Note that the on-link (L) bit
1494 * and the autonomous (A) bit should NOT be changed from 1
1497 if (new->ndpr_raf_onlink == 1)
1498 pr->ndpr_raf_onlink = 1;
1499 if (new->ndpr_raf_auto == 1)
1500 pr->ndpr_raf_auto = 1;
1501 if (new->ndpr_raf_onlink) {
1502 pr->ndpr_vltime = new->ndpr_vltime;
1503 pr->ndpr_pltime = new->ndpr_pltime;
1504 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1505 pr->ndpr_lastupdate = time_uptime;
1508 if (new->ndpr_raf_onlink &&
1509 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1511 if ((error = nd6_prefix_onlink(pr)) != 0) {
1513 "%s: failed to make the prefix %s/%d "
1514 "on-link on %s (errno=%d)\n", __func__,
1516 &pr->ndpr_prefix.sin6_addr),
1517 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1519 /* proceed anyway. XXX: is it correct? */
1521 ND6_ONLINK_UNLOCK();
1527 if (new->ndpr_vltime == 0)
1529 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1532 error = nd6_prelist_add(new, dr, &pr);
1534 nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for "
1535 "the prefix %s/%d on %s (errno=%d)\n", __func__,
1536 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1537 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1538 goto end; /* we should just give up in this case. */
1542 * XXX: from the ND point of view, we can ignore a prefix
1543 * with the on-link bit being zero. However, we need a
1544 * prefix structure for references from autoconfigured
1545 * addresses. Thus, we explicitly make sure that the prefix
1546 * itself expires now.
1548 if (pr->ndpr_raf_onlink == 0) {
1549 pr->ndpr_vltime = 0;
1550 pr->ndpr_pltime = 0;
1551 in6_init_prefix_ltimes(pr);
1556 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1557 * Note that pr must be non NULL at this point.
1560 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1561 if (!new->ndpr_raf_auto)
1565 * 5.5.3 (b). the link-local prefix should have been ignored in
1569 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1570 if (new->ndpr_pltime > new->ndpr_vltime) {
1571 error = EINVAL; /* XXX: won't be used */
1576 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1577 * an address configured by stateless autoconfiguration already in the
1578 * list of addresses associated with the interface, and the Valid
1579 * Lifetime is not 0, form an address. We first check if we have
1580 * a matching prefix.
1581 * Note: we apply a clarification in rfc2462bis-02 here. We only
1582 * consider autoconfigured addresses while RFC2462 simply said
1585 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1586 struct in6_ifaddr *ifa6;
1587 u_int32_t remaininglifetime;
1589 if (ifa->ifa_addr->sa_family != AF_INET6)
1592 ifa6 = (struct in6_ifaddr *)ifa;
1595 * We only consider autoconfigured addresses as per rfc2462bis.
1597 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1601 * Spec is not clear here, but I believe we should concentrate
1602 * on unicast (i.e. not anycast) addresses.
1603 * XXX: other ia6_flags? detached or duplicated?
1605 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1609 * Ignore the address if it is not associated with a prefix
1610 * or is associated with a prefix that is different from this
1611 * one. (pr is never NULL here)
1613 if (ifa6->ia6_ndpr != pr)
1616 if (ia6_match == NULL) /* remember the first one */
1620 * An already autoconfigured address matched. Now that we
1621 * are sure there is at least one matched address, we can
1622 * proceed to 5.5.3. (e): update the lifetimes according to the
1623 * "two hours" rule and the privacy extension.
1624 * We apply some clarifications in rfc2462bis:
1625 * - use remaininglifetime instead of storedlifetime as a
1627 * - remove the dead code in the "two-hour" rule
1629 #define TWOHOUR (120*60)
1630 lt6_tmp = ifa6->ia6_lifetime;
1632 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1633 remaininglifetime = ND6_INFINITE_LIFETIME;
1634 else if (time_uptime - ifa6->ia6_updatetime >
1635 lt6_tmp.ia6t_vltime) {
1637 * The case of "invalid" address. We should usually
1638 * not see this case.
1640 remaininglifetime = 0;
1642 remaininglifetime = lt6_tmp.ia6t_vltime -
1643 (time_uptime - ifa6->ia6_updatetime);
1645 /* when not updating, keep the current stored lifetime. */
1646 lt6_tmp.ia6t_vltime = remaininglifetime;
1648 if (TWOHOUR < new->ndpr_vltime ||
1649 remaininglifetime < new->ndpr_vltime) {
1650 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1651 } else if (remaininglifetime <= TWOHOUR) {
1653 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1657 * new->ndpr_vltime <= TWOHOUR &&
1658 * TWOHOUR < remaininglifetime
1660 lt6_tmp.ia6t_vltime = TWOHOUR;
1663 /* The 2 hour rule is not imposed for preferred lifetime. */
1664 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1666 in6_init_address_ltimes(pr, <6_tmp);
1669 * We need to treat lifetimes for temporary addresses
1670 * differently, according to
1671 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1672 * we only update the lifetimes when they are in the maximum
1675 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1676 u_int32_t maxvltime, maxpltime;
1678 if (V_ip6_temp_valid_lifetime >
1679 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1680 V_ip6_desync_factor)) {
1681 maxvltime = V_ip6_temp_valid_lifetime -
1682 (time_uptime - ifa6->ia6_createtime) -
1683 V_ip6_desync_factor;
1686 if (V_ip6_temp_preferred_lifetime >
1687 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1688 V_ip6_desync_factor)) {
1689 maxpltime = V_ip6_temp_preferred_lifetime -
1690 (time_uptime - ifa6->ia6_createtime) -
1691 V_ip6_desync_factor;
1695 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1696 lt6_tmp.ia6t_vltime > maxvltime) {
1697 lt6_tmp.ia6t_vltime = maxvltime;
1699 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1700 lt6_tmp.ia6t_pltime > maxpltime) {
1701 lt6_tmp.ia6t_pltime = maxpltime;
1704 ifa6->ia6_lifetime = lt6_tmp;
1705 ifa6->ia6_updatetime = time_uptime;
1707 if (ia6_match == NULL && new->ndpr_vltime) {
1711 * 5.5.3 (d) (continued)
1712 * No address matched and the valid lifetime is non-zero.
1713 * Create a new address.
1717 * Prefix Length check:
1718 * If the sum of the prefix length and interface identifier
1719 * length does not equal 128 bits, the Prefix Information
1720 * option MUST be ignored. The length of the interface
1721 * identifier is defined in a separate link-type specific
1724 ifidlen = in6_if2idlen(ifp);
1726 /* this should not happen, so we always log it. */
1727 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1731 if (ifidlen + pr->ndpr_plen != 128) {
1733 "%s: invalid prefixlen %d for %s, ignored\n",
1734 __func__, pr->ndpr_plen, if_name(ifp)));
1738 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1740 * note that we should use pr (not new) for reference.
1747 * When a new public address is created as described
1748 * in RFC2462, also create a new temporary address.
1751 * When an interface connects to a new link, a new
1752 * randomized interface identifier should be generated
1753 * immediately together with a new set of temporary
1754 * addresses. Thus, we specifiy 1 as the 2nd arg of
1757 if (V_ip6_use_tempaddr) {
1759 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1760 nd6log((LOG_NOTICE, "%s: failed to "
1761 "create a temporary address "
1762 "(errno=%d)\n", __func__, e));
1765 ifa_free(&ia6->ia_ifa);
1768 * A newly added address might affect the status
1769 * of other addresses, so we check and update it.
1770 * XXX: what if address duplication happens?
1772 pfxlist_onlink_check();
1774 /* just set an error. do not bark here. */
1775 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1781 nd6_prefix_rele(pr);
1786 * A supplement function used in the on-link detection below;
1787 * detect if a given prefix has a (probably) reachable advertising router.
1788 * XXX: lengthy function name...
1790 static struct nd_pfxrouter *
1791 find_pfxlist_reachable_router(struct nd_prefix *pr)
1793 struct epoch_tracker et;
1794 struct nd_pfxrouter *pfxrtr;
1800 NET_EPOCH_ENTER(et);
1801 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1802 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1805 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1815 * Check if each prefix in the prefix list has at least one available router
1816 * that advertised the prefix (a router is "available" if its neighbor cache
1817 * entry is reachable or probably reachable).
1818 * If the check fails, the prefix may be off-link, because, for example,
1819 * we have moved from the network but the lifetime of the prefix has not
1820 * expired yet. So we should not use the prefix if there is another prefix
1821 * that has an available router.
1822 * But, if there is no prefix that has an available router, we still regard
1823 * all the prefixes as on-link. This is because we can't tell if all the
1824 * routers are simply dead or if we really moved from the network and there
1825 * is no router around us.
1828 pfxlist_onlink_check(void)
1830 struct nd_prefix *pr;
1831 struct in6_ifaddr *ifa;
1832 struct nd_defrouter *dr;
1833 struct nd_pfxrouter *pfxrtr = NULL;
1834 struct rm_priotracker in6_ifa_tracker;
1842 * Check if there is a prefix that has a reachable advertising
1845 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1846 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1851 * If we have no such prefix, check whether we still have a router
1852 * that does not advertise any prefixes.
1855 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1856 struct nd_prefix *pr0;
1858 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1859 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1866 if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) {
1868 * There is at least one prefix that has a reachable router,
1869 * or at least a router which probably does not advertise
1870 * any prefixes. The latter would be the case when we move
1871 * to a new link where we have a router that does not provide
1872 * prefixes and we configure an address by hand.
1873 * Detach prefixes which have no reachable advertising
1874 * router, and attach other prefixes.
1876 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1877 /* XXX: a link-local prefix should never be detached */
1878 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1879 pr->ndpr_raf_onlink == 0 ||
1880 pr->ndpr_raf_auto == 0)
1883 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1884 find_pfxlist_reachable_router(pr) == NULL)
1885 pr->ndpr_stateflags |= NDPRF_DETACHED;
1886 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1887 find_pfxlist_reachable_router(pr) != NULL)
1888 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1891 /* there is no prefix that has a reachable router */
1892 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1893 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1894 pr->ndpr_raf_onlink == 0 ||
1895 pr->ndpr_raf_auto == 0)
1897 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1902 * Remove each interface route associated with a (just) detached
1903 * prefix, and reinstall the interface route for a (just) attached
1904 * prefix. Note that all attempt of reinstallation does not
1905 * necessarily success, when a same prefix is shared among multiple
1906 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1907 * so we don't have to care about them.
1910 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1911 char ip6buf[INET6_ADDRSTRLEN];
1914 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1915 pr->ndpr_raf_onlink == 0 ||
1916 pr->ndpr_raf_auto == 0)
1919 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1920 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1921 genid = V_nd6_list_genid;
1923 if ((flags & NDPRF_ONLINK) != 0 &&
1924 (e = nd6_prefix_offlink(pr)) != 0) {
1926 "%s: failed to make %s/%d offlink "
1927 "(errno=%d)\n", __func__,
1929 &pr->ndpr_prefix.sin6_addr),
1931 } else if ((flags & NDPRF_ONLINK) == 0 &&
1932 (e = nd6_prefix_onlink(pr)) != 0) {
1934 "%s: failed to make %s/%d onlink "
1935 "(errno=%d)\n", __func__,
1937 &pr->ndpr_prefix.sin6_addr),
1941 if (genid != V_nd6_list_genid)
1947 * Changes on the prefix status might affect address status as well.
1948 * Make sure that all addresses derived from an attached prefix are
1949 * attached, and that all addresses derived from a detached prefix are
1950 * detached. Note, however, that a manually configured address should
1951 * always be attached.
1952 * The precise detection logic is same as the one for prefixes.
1954 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1955 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1956 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1959 if (ifa->ia6_ndpr == NULL) {
1961 * This can happen when we first configure the address
1962 * (i.e. the address exists, but the prefix does not).
1963 * XXX: complicated relationships...
1968 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1972 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1973 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1976 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1979 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1980 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1981 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1982 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1983 nd6_dad_start((struct ifaddr *)ifa, 0);
1986 ifa->ia6_flags |= IN6_IFF_DETACHED;
1990 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1991 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1994 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1995 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1996 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1997 /* Do we need a delay in this case? */
1998 nd6_dad_start((struct ifaddr *)ifa, 0);
2002 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
2004 ND6_ONLINK_UNLOCK();
2008 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
2010 struct sockaddr_dl_short sdl;
2012 struct sockaddr_in6 mask6;
2014 int error, a_failure, fibnum, maxfib;
2017 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
2018 * ifa->ifa_rtrequest = nd6_rtrequest;
2020 bzero(&mask6, sizeof(mask6));
2021 mask6.sin6_len = sizeof(mask6);
2022 mask6.sin6_addr = pr->ndpr_mask;
2023 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
2025 bzero(&sdl, sizeof(struct sockaddr_dl_short));
2026 sdl.sdl_len = sizeof(struct sockaddr_dl_short);
2027 sdl.sdl_family = AF_LINK;
2028 sdl.sdl_type = ifa->ifa_ifp->if_type;
2029 sdl.sdl_index = ifa->ifa_ifp->if_index;
2031 if(V_rt_add_addr_allfibs) {
2033 maxfib = rt_numfibs;
2035 fibnum = ifa->ifa_ifp->if_fib;
2036 maxfib = fibnum + 1;
2039 for (; fibnum < maxfib; fibnum++) {
2042 error = in6_rtrequest(RTM_ADD,
2043 (struct sockaddr *)&pr->ndpr_prefix, (struct sockaddr *)&sdl,
2044 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
2046 char ip6buf[INET6_ADDRSTRLEN];
2047 char ip6bufg[INET6_ADDRSTRLEN];
2048 char ip6bufm[INET6_ADDRSTRLEN];
2049 struct sockaddr_in6 *sin6;
2051 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2052 nd6log((LOG_ERR, "%s: failed to add "
2053 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
2054 "flags=%lx errno = %d\n", __func__,
2055 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2056 pr->ndpr_plen, if_name(pr->ndpr_ifp),
2057 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
2058 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
2061 /* Save last error to return, see rtinit(). */
2066 pr->ndpr_stateflags |= NDPRF_ONLINK;
2067 rt_routemsg(RTM_ADD, rt, pr->ndpr_ifp, 0, fibnum);
2070 /* Return the last error we got. */
2075 nd6_prefix_onlink(struct nd_prefix *pr)
2077 struct epoch_tracker et;
2079 struct ifnet *ifp = pr->ndpr_ifp;
2080 struct nd_prefix *opr;
2081 char ip6buf[INET6_ADDRSTRLEN];
2084 ND6_ONLINK_LOCK_ASSERT();
2085 ND6_UNLOCK_ASSERT();
2087 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
2091 * Add the interface route associated with the prefix. Before
2092 * installing the route, check if there's the same prefix on another
2093 * interface, and the prefix has already installed the interface route.
2094 * Although such a configuration is expected to be rare, we explicitly
2098 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2102 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2105 if (!V_rt_add_addr_allfibs &&
2106 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
2109 if (opr->ndpr_plen == pr->ndpr_plen &&
2110 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2111 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2119 * We prefer link-local addresses as the associated interface address.
2121 /* search for a link-local addr */
2122 NET_EPOCH_ENTER(et);
2123 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
2124 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
2126 /* XXX: freebsd does not have ifa_ifwithaf */
2127 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2128 if (ifa->ifa_addr->sa_family == AF_INET6) {
2133 /* should we care about ia6_flags? */
2137 * This can still happen, when, for example, we receive an RA
2138 * containing a prefix with the L bit set and the A bit clear,
2139 * after removing all IPv6 addresses on the receiving
2140 * interface. This should, of course, be rare though.
2143 "%s: failed to find any ifaddr to add route for a "
2144 "prefix(%s/%d) on %s\n", __func__,
2145 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2146 pr->ndpr_plen, if_name(ifp)));
2149 error = nd6_prefix_onlink_rtrequest(pr, ifa);
2158 nd6_prefix_offlink(struct nd_prefix *pr)
2161 struct ifnet *ifp = pr->ndpr_ifp;
2162 struct nd_prefix *opr;
2163 struct sockaddr_in6 sa6, mask6;
2165 char ip6buf[INET6_ADDRSTRLEN];
2167 int fibnum, maxfib, a_failure;
2168 struct epoch_tracker et;
2170 ND6_ONLINK_LOCK_ASSERT();
2171 ND6_UNLOCK_ASSERT();
2173 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2176 bzero(&sa6, sizeof(sa6));
2177 sa6.sin6_family = AF_INET6;
2178 sa6.sin6_len = sizeof(sa6);
2179 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2180 sizeof(struct in6_addr));
2181 bzero(&mask6, sizeof(mask6));
2182 mask6.sin6_family = AF_INET6;
2183 mask6.sin6_len = sizeof(sa6);
2184 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2186 if (V_rt_add_addr_allfibs) {
2188 maxfib = rt_numfibs;
2190 fibnum = ifp->if_fib;
2191 maxfib = fibnum + 1;
2195 NET_EPOCH_ENTER(et);
2196 for (; fibnum < maxfib; fibnum++) {
2198 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
2199 (struct sockaddr *)&mask6, 0, &rt, fibnum);
2201 /* Save last error to return, see rtinit(). */
2206 /* report route deletion to the routing socket. */
2207 rt_routemsg(RTM_DELETE, rt, ifp, 0, fibnum);
2213 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2216 * There might be the same prefix on another interface,
2217 * the prefix which could not be on-link just because we have
2218 * the interface route (see comments in nd6_prefix_onlink).
2219 * If there's one, try to make the prefix on-link on the
2224 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2226 * KAME specific: detached prefixes should not be
2229 if (opr == pr || (opr->ndpr_stateflags &
2230 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2233 if (opr->ndpr_plen == pr->ndpr_plen &&
2234 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2235 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2238 genid = V_nd6_list_genid;
2240 if ((e = nd6_prefix_onlink(opr)) != 0) {
2242 "%s: failed to recover a prefix "
2243 "%s/%d from %s to %s (errno=%d)\n",
2244 __func__, ip6_sprintf(ip6buf,
2245 &opr->ndpr_prefix.sin6_addr),
2246 opr->ndpr_plen, if_name(ifp),
2247 if_name(opr->ndpr_ifp), e));
2251 if (genid != V_nd6_list_genid)
2257 /* XXX: can we still set the NDPRF_ONLINK flag? */
2259 "%s: failed to delete route: %s/%d on %s (errno=%d)\n",
2260 __func__, ip6_sprintf(ip6buf, &sa6.sin6_addr),
2261 pr->ndpr_plen, if_name(ifp), error));
2265 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2266 (struct sockaddr *)&mask6, LLE_STATIC);
2272 * ia0 - corresponding public address
2275 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2277 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2278 struct in6_ifaddr *newia;
2279 struct in6_aliasreq ifra;
2281 int trylimit = 3; /* XXX: adhoc value */
2283 u_int32_t randid[2];
2284 time_t vltime0, pltime0;
2286 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2287 &ia0->ia_prefixmask.sin6_addr);
2289 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2290 /* clear the old IFID */
2291 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2292 &ifra.ifra_prefixmask.sin6_addr);
2295 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2296 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2297 nd6log((LOG_NOTICE, "%s: failed to find a good random IFID\n",
2301 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2302 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2303 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2304 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2307 * in6_get_tmpifid() quite likely provided a unique interface ID.
2308 * However, we may still have a chance to see collision, because
2309 * there may be a time lag between generation of the ID and generation
2310 * of the address. So, we'll do one more sanity check.
2313 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2314 if (trylimit-- > 0) {
2319 /* Give up. Something strange should have happened. */
2320 nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n",
2326 * The Valid Lifetime is the lower of the Valid Lifetime of the
2327 * public address or TEMP_VALID_LIFETIME.
2328 * The Preferred Lifetime is the lower of the Preferred Lifetime
2329 * of the public address or TEMP_PREFERRED_LIFETIME -
2332 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2333 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2334 (ia0->ia6_lifetime.ia6t_vltime -
2335 (time_uptime - ia0->ia6_updatetime));
2336 if (vltime0 > V_ip6_temp_valid_lifetime)
2337 vltime0 = V_ip6_temp_valid_lifetime;
2339 vltime0 = V_ip6_temp_valid_lifetime;
2340 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2341 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2342 (ia0->ia6_lifetime.ia6t_pltime -
2343 (time_uptime - ia0->ia6_updatetime));
2344 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2345 pltime0 = V_ip6_temp_preferred_lifetime -
2346 V_ip6_desync_factor;
2349 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2350 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2351 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2354 * A temporary address is created only if this calculated Preferred
2355 * Lifetime is greater than REGEN_ADVANCE time units.
2357 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2360 /* XXX: scope zone ID? */
2362 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2364 /* allocate ifaddr structure, link into chain, etc. */
2367 updateflags |= IN6_IFAUPDATE_DADDELAY;
2368 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2371 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2372 if (newia == NULL) { /* XXX: can it happen? */
2374 "%s: ifa update succeeded, but we got no ifaddr\n",
2376 return (EINVAL); /* XXX */
2378 newia->ia6_ndpr = ia0->ia6_ndpr;
2379 newia->ia6_ndpr->ndpr_addrcnt++;
2380 ifa_free(&newia->ia_ifa);
2383 * A newly added address might affect the status of other addresses.
2384 * XXX: when the temporary address is generated with a new public
2385 * address, the onlink check is redundant. However, it would be safe
2386 * to do the check explicitly everywhere a new address is generated,
2387 * and, in fact, we surely need the check when we create a new
2388 * temporary address due to deprecation of an old temporary address.
2390 pfxlist_onlink_check();
2396 rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh,
2399 struct in6_addr *gate = (struct in6_addr *)arg;
2402 if (nh->gw_sa.sa_family != AF_INET6)
2405 if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.sin6_addr)) {
2410 * Do not delete a static route.
2411 * XXX: this seems to be a bit ad-hoc. Should we consider the
2412 * 'cloned' bit instead?
2414 nh_rt_flags = nhop_get_rtflags(nh);
2415 if ((nh_rt_flags & RTF_STATIC) != 0)
2419 * We delete only host route. This means, in particular, we don't
2420 * delete default route.
2422 if ((nh_rt_flags & RTF_HOST) == 0)
2430 * Delete all the routing table entries that use the specified gateway.
2431 * XXX: this function causes search through all entries of routing table, so
2432 * it shouldn't be called when acting as a router.
2435 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2438 /* We'll care only link-local addresses */
2439 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2442 /* XXX Do we really need to walk any but the default FIB? */
2443 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2447 nd6_setdefaultiface(int ifindex)
2451 if (ifindex < 0 || V_if_index < ifindex)
2453 if (ifindex != 0 && !ifnet_byindex(ifindex))
2456 if (V_nd6_defifindex != ifindex) {
2457 V_nd6_defifindex = ifindex;
2458 if (V_nd6_defifindex > 0)
2459 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2461 V_nd6_defifp = NULL;
2464 * Our current implementation assumes one-to-one maping between
2465 * interfaces and links, so it would be natural to use the
2466 * default interface as the default link.
2468 scope6_setdefault(V_nd6_defifp);
2475 nd6_defrouter_list_empty(void)
2478 return (TAILQ_EMPTY(&V_nd6_defrouter));
2482 nd6_defrouter_timer(void)
2484 struct nd_defrouter *dr, *ndr;
2485 struct nd6_drhead drq;
2490 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr)
2491 if (dr->expire && dr->expire < time_uptime)
2492 defrouter_unlink(dr, &drq);
2495 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2496 TAILQ_REMOVE(&drq, dr, dr_entry);
2502 * Nuke default router list entries toward ifp.
2503 * We defer removal of default router list entries that is installed in the
2504 * routing table, in order to keep additional side effects as small as possible.
2507 nd6_defrouter_purge(struct ifnet *ifp)
2509 struct nd_defrouter *dr, *ndr;
2510 struct nd6_drhead drq;
2515 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2519 defrouter_unlink(dr, &drq);
2521 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2525 defrouter_unlink(dr, &drq);
2529 /* Delete the unlinked router objects. */
2530 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2531 TAILQ_REMOVE(&drq, dr, dr_entry);
2537 nd6_defrouter_flush_all(void)
2539 struct nd_defrouter *dr;
2540 struct nd6_drhead drq;
2545 while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL)
2546 defrouter_unlink(dr, &drq);
2549 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2550 TAILQ_REMOVE(&drq, dr, dr_entry);
2556 nd6_defrouter_init(void)
2559 TAILQ_INIT(&V_nd6_defrouter);
2563 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2565 struct in6_defrouter d;
2566 struct nd_defrouter *dr;
2569 if (req->newptr != NULL)
2572 error = sysctl_wire_old_buffer(req, 0);
2576 bzero(&d, sizeof(d));
2577 d.rtaddr.sin6_family = AF_INET6;
2578 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2581 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
2582 d.rtaddr.sin6_addr = dr->rtaddr;
2583 error = sa6_recoverscope(&d.rtaddr);
2586 d.flags = dr->raflags;
2587 d.rtlifetime = dr->rtlifetime;
2588 d.expire = dr->expire + (time_second - time_uptime);
2589 d.if_index = dr->ifp->if_index;
2590 error = SYSCTL_OUT(req, &d, sizeof(d));
2597 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2598 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2599 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
2600 "NDP default router list");