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_var.h>
63 #include <net/radix.h>
66 #include <netinet/in.h>
67 #include <net/if_llatbl.h>
68 #include <netinet6/in6_var.h>
69 #include <netinet6/in6_ifattach.h>
70 #include <netinet/ip6.h>
71 #include <netinet6/ip6_var.h>
72 #include <netinet6/nd6.h>
73 #include <netinet/icmp6.h>
74 #include <netinet6/scope6_var.h>
76 static int rtpref(struct nd_defrouter *);
77 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
78 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
80 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
81 static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
82 struct nd_defrouter *);
83 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
84 static void pfxrtr_del(struct nd_pfxrouter *);
85 static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *);
86 static void defrouter_delreq(struct nd_defrouter *);
87 static void nd6_rtmsg(int, struct rtentry *);
89 static int in6_init_prefix_ltimes(struct nd_prefix *);
90 static void in6_init_address_ltimes(struct nd_prefix *,
91 struct in6_addrlifetime *);
93 static int rt6_deleteroute(const struct rtentry *, void *);
95 VNET_DEFINE_STATIC(struct nd_drhead, nd_defrouter);
96 #define V_nd_defrouter VNET(nd_defrouter)
98 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
99 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
101 VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp);
102 VNET_DEFINE(int, nd6_defifindex);
103 #define V_nd6_defifp VNET(nd6_defifp)
105 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
107 VNET_DEFINE(int, ip6_desync_factor);
108 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
109 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
111 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
114 VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
117 /* RTPREF_MEDIUM has to be 0! */
118 #define RTPREF_HIGH 1
119 #define RTPREF_MEDIUM 0
120 #define RTPREF_LOW (-1)
121 #define RTPREF_RESERVED (-2)
122 #define RTPREF_INVALID (-3) /* internal */
125 defrouter_ref(struct nd_defrouter *dr)
128 refcount_acquire(&dr->refcnt);
132 defrouter_rele(struct nd_defrouter *dr)
135 if (refcount_release(&dr->refcnt))
140 * Remove a router from the global list and optionally stash it in a
141 * caller-supplied queue.
144 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
149 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
152 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
156 * Receive Router Solicitation Message - just for routers.
157 * Router solicitation/advertisement is mostly managed by userland program
158 * (rtadvd) so here we have no function like nd6_ra_output().
163 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
167 struct nd_router_solicit *nd_rs;
168 struct in6_addr saddr6;
169 union nd_opts ndopts;
170 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
174 ifp = m->m_pkthdr.rcvif;
177 * Accept RS only when V_ip6_forwarding=1 and the interface has
178 * no ND6_IFF_ACCEPT_RTADV.
180 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
183 /* RFC 6980: Nodes MUST silently ignore fragments */
184 if(m->m_flags & M_FRAGMENTED)
188 ip6 = mtod(m, struct ip6_hdr *);
189 if (ip6->ip6_hlim != 255) {
191 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
192 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
193 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
198 * Don't update the neighbor cache, if src = ::.
199 * This indicates that the src has no IP address assigned yet.
201 saddr6 = ip6->ip6_src;
202 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
205 #ifndef PULLDOWN_TEST
206 IP6_EXTHDR_CHECK(m, off, icmp6len,);
207 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
209 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
211 ICMP6STAT_INC(icp6s_tooshort);
216 icmp6len -= sizeof(*nd_rs);
217 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
218 if (nd6_options(&ndopts) < 0) {
220 "nd6_rs_input: invalid ND option, ignored\n"));
221 /* nd6_options have incremented stats */
227 if (ndopts.nd_opts_src_lladdr) {
228 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
229 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
232 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
234 "nd6_rs_input: lladdrlen mismatch for %s "
235 "(if %d, RS packet %d)\n",
236 ip6_sprintf(ip6bufs, &saddr6),
237 ifp->if_addrlen, lladdrlen - 2));
241 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
248 ICMP6STAT_INC(icp6s_badrs);
254 * An initial update routine for draft-ietf-6man-ipv6only-flag.
255 * We need to iterate over all default routers for the given
256 * interface to see whether they are all advertising the "S"
257 * (IPv6-Only) flag. If they do set, otherwise unset, the
258 * interface flag we later use to filter on.
261 defrtr_ipv6_only_ifp(struct ifnet *ifp)
263 struct nd_defrouter *dr;
264 bool ipv6_only, ipv6_only_old;
266 struct epoch_tracker et;
271 if (V_nd6_ignore_ipv6_only_ra != 0)
276 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
277 if (dr->ifp == ifp &&
278 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
282 IF_AFDATA_WLOCK(ifp);
283 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
284 IF_AFDATA_WUNLOCK(ifp);
286 /* If nothing changed, we have an early exit. */
287 if (ipv6_only == ipv6_only_old)
292 * Should we want to set the IPV6-ONLY flag, check if the
293 * interface has a non-0/0 and non-link-local IPv4 address
294 * configured on it. If it has we will assume working
295 * IPv4 operations and will clear the interface flag.
297 has_ipv4_addr = false;
300 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
301 if (ifa->ifa_addr->sa_family != AF_INET)
304 satosin(ifa->ifa_addr)->sin_addr)) {
305 has_ipv4_addr = true;
311 if (ipv6_only && has_ipv4_addr) {
312 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
313 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
318 IF_AFDATA_WLOCK(ifp);
320 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
322 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
323 IF_AFDATA_WUNLOCK(ifp);
326 /* Send notification of flag change. */
331 defrtr_ipv6_only_ipf_down(struct ifnet *ifp)
334 IF_AFDATA_WLOCK(ifp);
335 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
336 IF_AFDATA_WUNLOCK(ifp);
338 #endif /* EXPERIMENTAL */
341 nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
345 * XXX-BZ we might want to trigger re-evaluation of our default router
346 * availability. E.g., on link down the default router might be
347 * unreachable but a different interface might still have connectivity.
351 if (linkstate == LINK_STATE_DOWN)
352 defrtr_ipv6_only_ipf_down(ifp);
357 * Receive Router Advertisement Message.
360 * TODO: on-link bit on prefix information
361 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
364 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
367 struct nd_ifinfo *ndi;
369 struct nd_router_advert *nd_ra;
370 struct in6_addr saddr6;
371 struct nd_defrouter *dr;
372 union nd_opts ndopts;
373 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
377 * We only accept RAs only when the per-interface flag
378 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
380 ifp = m->m_pkthdr.rcvif;
381 ndi = ND_IFINFO(ifp);
382 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
385 /* RFC 6980: Nodes MUST silently ignore fragments */
386 if(m->m_flags & M_FRAGMENTED)
389 ip6 = mtod(m, struct ip6_hdr *);
390 if (ip6->ip6_hlim != 255) {
392 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
393 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
394 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
398 saddr6 = ip6->ip6_src;
399 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
401 "nd6_ra_input: src %s is not link-local\n",
402 ip6_sprintf(ip6bufs, &saddr6)));
406 #ifndef PULLDOWN_TEST
407 IP6_EXTHDR_CHECK(m, off, icmp6len,);
408 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
410 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
412 ICMP6STAT_INC(icp6s_tooshort);
417 icmp6len -= sizeof(*nd_ra);
418 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
419 if (nd6_options(&ndopts) < 0) {
421 "nd6_ra_input: invalid ND option, ignored\n"));
422 /* nd6_options have incremented stats */
429 struct nd_defrouter dr0;
430 u_int32_t advreachable = nd_ra->nd_ra_reachable;
432 /* remember if this is a multicasted advertisement */
433 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
436 bzero(&dr0, sizeof(dr0));
438 dr0.raflags = nd_ra->nd_ra_flags_reserved;
440 * Effectively-disable routes from RA messages when
441 * ND6_IFF_NO_RADR enabled on the receiving interface or
442 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
444 if (ndi->flags & ND6_IFF_NO_RADR)
446 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
449 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
450 dr0.expire = time_uptime + dr0.rtlifetime;
452 /* unspecified or not? (RFC 2461 6.3.4) */
454 advreachable = ntohl(advreachable);
455 if (advreachable <= MAX_REACHABLE_TIME &&
456 ndi->basereachable != advreachable) {
457 ndi->basereachable = advreachable;
458 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
459 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
462 if (nd_ra->nd_ra_retransmit)
463 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
464 if (nd_ra->nd_ra_curhoplimit) {
465 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
466 ndi->chlim = nd_ra->nd_ra_curhoplimit;
467 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
468 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
469 "%s on %s (current = %d, received = %d). "
470 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
471 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
474 dr = defrtrlist_update(&dr0);
476 defrtr_ipv6_only_ifp(ifp);
483 if (ndopts.nd_opts_pi) {
484 struct nd_opt_hdr *pt;
485 struct nd_opt_prefix_info *pi = NULL;
486 struct nd_prefixctl pr;
488 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
489 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
490 pt = (struct nd_opt_hdr *)((caddr_t)pt +
491 (pt->nd_opt_len << 3))) {
492 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
494 pi = (struct nd_opt_prefix_info *)pt;
496 if (pi->nd_opt_pi_len != 4) {
498 "nd6_ra_input: invalid option "
499 "len %d for prefix information option, "
500 "ignored\n", pi->nd_opt_pi_len));
504 if (128 < pi->nd_opt_pi_prefix_len) {
506 "nd6_ra_input: invalid prefix "
507 "len %d for prefix information option, "
508 "ignored\n", pi->nd_opt_pi_prefix_len));
512 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
513 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
515 "nd6_ra_input: invalid prefix "
518 &pi->nd_opt_pi_prefix)));
522 bzero(&pr, sizeof(pr));
523 pr.ndpr_prefix.sin6_family = AF_INET6;
524 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
525 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
526 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
528 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
529 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
530 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
531 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
532 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
533 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
534 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
535 (void)prelist_update(&pr, dr, m, mcast);
546 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
550 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
553 if (mtu < IPV6_MMTU) {
554 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
555 "mtu=%lu sent from %s, ignoring\n",
556 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
561 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
562 ? ndi->maxmtu : ifp->if_mtu;
564 int change = (ndi->linkmtu != mtu);
568 /* in6_maxmtu may change */
573 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
574 "mtu=%lu sent from %s; "
575 "exceeds maxmtu %lu, ignoring\n",
576 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
583 * Source link layer address
589 if (ndopts.nd_opts_src_lladdr) {
590 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
591 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
594 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
596 "nd6_ra_input: lladdrlen mismatch for %s "
597 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
598 ifp->if_addrlen, lladdrlen - 2));
602 nd6_cache_lladdr(ifp, &saddr6, lladdr,
603 lladdrlen, ND_ROUTER_ADVERT, 0);
606 * Installing a link-layer address might change the state of the
607 * router's neighbor cache, which might also affect our on-link
608 * detection of adveritsed prefixes.
610 pfxlist_onlink_check();
618 ICMP6STAT_INC(icp6s_badra);
622 /* tell the change to user processes watching the routing socket. */
624 nd6_rtmsg(int cmd, struct rtentry *rt)
626 struct rt_addrinfo info;
630 bzero((caddr_t)&info, sizeof(info));
631 info.rti_info[RTAX_DST] = rt_key(rt);
632 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
633 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
636 struct epoch_tracker et;
639 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
640 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
643 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
647 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
653 * default router list processing sub routines
657 defrouter_addreq(struct nd_defrouter *new)
659 struct sockaddr_in6 def, mask, gate;
660 struct rtentry *newrt = NULL;
663 bzero(&def, sizeof(def));
664 bzero(&mask, sizeof(mask));
665 bzero(&gate, sizeof(gate));
667 def.sin6_len = mask.sin6_len = gate.sin6_len =
668 sizeof(struct sockaddr_in6);
669 def.sin6_family = gate.sin6_family = AF_INET6;
670 gate.sin6_addr = new->rtaddr;
672 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
673 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
674 RTF_GATEWAY, &newrt, new->ifp->if_fib);
676 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
683 struct nd_defrouter *
684 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
686 struct nd_defrouter *dr;
689 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
690 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
697 struct nd_defrouter *
698 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
700 struct nd_defrouter *dr;
703 dr = defrouter_lookup_locked(addr, ifp);
709 * Remove the default route for a given router.
710 * This is just a subroutine function for defrouter_select_fib(), and
711 * should not be called from anywhere else.
714 defrouter_delreq(struct nd_defrouter *dr)
716 struct sockaddr_in6 def, mask, gate;
717 struct rtentry *oldrt = NULL;
719 bzero(&def, sizeof(def));
720 bzero(&mask, sizeof(mask));
721 bzero(&gate, sizeof(gate));
723 def.sin6_len = mask.sin6_len = gate.sin6_len =
724 sizeof(struct sockaddr_in6);
725 def.sin6_family = gate.sin6_family = AF_INET6;
726 gate.sin6_addr = dr->rtaddr;
728 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
729 (struct sockaddr *)&gate,
730 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
732 nd6_rtmsg(RTM_DELETE, oldrt);
740 * Remove all default routes from default router list.
743 defrouter_reset(void)
745 struct nd_defrouter *dr, **dra;
751 * We can't delete routes with the ND lock held, so make a copy of the
752 * current default router list and use that when deleting routes.
755 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
759 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
762 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
770 for (i = 0; i < count && dra[i] != NULL; i++) {
771 defrouter_delreq(dra[i]);
772 defrouter_rele(dra[i]);
777 * XXX should we also nuke any default routers in the kernel, by
778 * going through them by rtalloc1()?
783 defrouter_del(struct nd_defrouter *dr)
785 struct nd_defrouter *deldr = NULL;
786 struct nd_prefix *pr;
787 struct nd_pfxrouter *pfxrtr;
792 * Flush all the routing table entries that use the router
795 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
796 rt6_flush(&dr->rtaddr, dr->ifp);
799 defrtr_ipv6_only_ifp(dr->ifp);
804 defrouter_delreq(dr);
808 * Also delete all the pointers to the router in each prefix lists.
811 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
812 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
817 pfxlist_onlink_check();
820 * If the router is the primary one, choose a new one.
821 * Note that defrouter_select_fib() will remove the current
822 * gateway from the routing table.
825 defrouter_select_fib(deldr->ifp->if_fib);
828 * Release the list reference.
835 * Look up a matching default router list entry and remove it. Returns true if a
836 * matching entry was found, false otherwise.
839 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
841 struct nd_defrouter *dr;
844 dr = defrouter_lookup_locked(addr, ifp);
850 defrouter_unlink(dr, NULL);
858 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
859 * draft-ietf-ipngwg-router-selection:
860 * 1) Routers that are reachable or probably reachable should be preferred.
861 * If we have more than one (probably) reachable router, prefer ones
862 * with the highest router preference.
863 * 2) When no routers on the list are known to be reachable or
864 * probably reachable, routers SHOULD be selected in a round-robin
865 * fashion, regardless of router preference values.
866 * 3) If the Default Router List is empty, assume that all
867 * destinations are on-link.
869 * We assume nd_defrouter is sorted by router preference value.
870 * Since the code below covers both with and without router preference cases,
871 * we do not need to classify the cases by ifdef.
873 * At this moment, we do not try to install more than one default router,
874 * even when the multipath routing is available, because we're not sure about
875 * the benefits for stub hosts comparing to the risk of making the code
876 * complicated and the possibility of introducing bugs.
878 * We maintain a single list of routers for multiple FIBs, only considering one
879 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
880 * we do the whole thing multiple times.
883 defrouter_select_fib(int fibnum)
885 struct epoch_tracker et;
886 struct nd_defrouter *dr, *selected_dr, *installed_dr;
887 struct llentry *ln = NULL;
889 if (fibnum == RT_ALL_FIBS) {
890 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
891 defrouter_select_fib(fibnum);
897 * Let's handle easy case (3) first:
898 * If default router list is empty, there's nothing to be done.
900 if (TAILQ_EMPTY(&V_nd_defrouter)) {
906 * Search for a (probably) reachable router from the list.
907 * We just pick up the first reachable one (if any), assuming that
908 * the ordering rule of the list described in defrtrlist_update().
910 selected_dr = installed_dr = NULL;
911 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
913 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
914 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
915 ND6_IS_LLINFO_PROBREACH(ln)) {
917 defrouter_ref(selected_dr);
925 if (dr->installed && dr->ifp->if_fib == fibnum) {
926 if (installed_dr == NULL) {
928 defrouter_ref(installed_dr);
931 * this should not happen.
932 * warn for diagnosis.
934 log(LOG_ERR, "defrouter_select_fib: more than "
935 "one router is installed\n");
940 * If none of the default routers was found to be reachable,
941 * round-robin the list regardless of preference.
942 * Otherwise, if we have an installed router, check if the selected
943 * (reachable) router should really be preferred to the installed one.
944 * We only prefer the new router when the old one is not reachable
945 * or when the new one has a really higher preference value.
947 if (selected_dr == NULL) {
948 if (installed_dr == NULL ||
949 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
950 dr = TAILQ_FIRST(&V_nd_defrouter);
952 dr = TAILQ_NEXT(installed_dr, dr_entry);
954 /* Ensure we select a router for this FIB. */
955 TAILQ_FOREACH_FROM(dr, &V_nd_defrouter, dr_entry) {
956 if (dr->ifp->if_fib == fibnum) {
958 defrouter_ref(selected_dr);
962 } else if (installed_dr != NULL) {
964 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
965 installed_dr->ifp)) &&
966 ND6_IS_LLINFO_PROBREACH(ln) &&
967 installed_dr->ifp->if_fib == fibnum &&
968 rtpref(selected_dr) <= rtpref(installed_dr)) {
969 defrouter_rele(selected_dr);
970 selected_dr = installed_dr;
979 * If we selected a router for this FIB and it's different
980 * than the installed one, remove the installed router and
981 * install the selected one in its place.
983 if (installed_dr != selected_dr) {
984 if (installed_dr != NULL) {
985 defrouter_delreq(installed_dr);
986 defrouter_rele(installed_dr);
988 if (selected_dr != NULL)
989 defrouter_addreq(selected_dr);
991 if (selected_dr != NULL)
992 defrouter_rele(selected_dr);
996 * Maintain old KPI for default router selection.
997 * If unspecified, we can re-select routers for all FIBs.
1000 defrouter_select(void)
1002 defrouter_select_fib(RT_ALL_FIBS);
1006 * for default router selection
1007 * regards router-preference field as a 2-bit signed integer
1010 rtpref(struct nd_defrouter *dr)
1012 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
1013 case ND_RA_FLAG_RTPREF_HIGH:
1014 return (RTPREF_HIGH);
1015 case ND_RA_FLAG_RTPREF_MEDIUM:
1016 case ND_RA_FLAG_RTPREF_RSV:
1017 return (RTPREF_MEDIUM);
1018 case ND_RA_FLAG_RTPREF_LOW:
1019 return (RTPREF_LOW);
1022 * This case should never happen. If it did, it would mean a
1023 * serious bug of kernel internal. We thus always bark here.
1024 * Or, can we even panic?
1026 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
1027 return (RTPREF_INVALID);
1032 static struct nd_defrouter *
1033 defrtrlist_update(struct nd_defrouter *new)
1035 struct nd_defrouter *dr, *n;
1040 if (new->rtlifetime == 0) {
1041 defrouter_remove(&new->rtaddr, new->ifp);
1046 writelocked = false;
1048 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
1050 oldpref = rtpref(dr);
1053 dr->raflags = new->raflags; /* XXX flag check */
1054 dr->rtlifetime = new->rtlifetime;
1055 dr->expire = new->expire;
1058 * If the preference does not change, there's no need
1059 * to sort the entries. Also make sure the selected
1060 * router is still installed in the kernel.
1062 if (dr->installed && rtpref(new) == oldpref) {
1072 * The router needs to be reinserted into the default router
1073 * list, so upgrade to a write lock. If that fails and the list
1074 * has potentially changed while the lock was dropped, we'll
1075 * redo the lookup with the write lock held.
1079 if (!ND6_TRY_UPGRADE()) {
1080 genid = V_nd6_list_genid;
1083 if (genid != V_nd6_list_genid)
1090 * The preferred router may have changed, so relocate this
1093 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
1096 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1101 memcpy(n, new, sizeof(*n));
1102 /* Initialize with an extra reference for the caller. */
1103 refcount_init(&n->refcnt, 2);
1107 * Insert the new router in the Default Router List;
1108 * The Default Router List should be in the descending order
1109 * of router-preferece. Routers with the same preference are
1110 * sorted in the arriving time order.
1113 /* insert at the end of the group */
1114 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1115 if (rtpref(n) > rtpref(dr))
1119 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1121 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
1125 defrouter_select_fib(new->ifp->if_fib);
1130 static struct nd_pfxrouter *
1131 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
1133 struct nd_pfxrouter *search;
1137 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
1138 if (search->router == dr)
1145 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
1147 struct nd_pfxrouter *new;
1150 ND6_UNLOCK_ASSERT();
1153 if (pfxrtr_lookup(pr, dr) != NULL) {
1159 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1166 if (pfxrtr_lookup(pr, dr) == NULL) {
1167 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
1170 /* We lost a race to add the reference. */
1172 free(new, M_IP6NDP);
1178 pfxlist_onlink_check();
1182 pfxrtr_del(struct nd_pfxrouter *pfr)
1187 LIST_REMOVE(pfr, pfr_entry);
1188 defrouter_rele(pfr->router);
1189 free(pfr, M_IP6NDP);
1192 static struct nd_prefix *
1193 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1195 struct nd_prefix *search;
1199 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1200 if (key->ndpr_ifp == search->ndpr_ifp &&
1201 key->ndpr_plen == search->ndpr_plen &&
1202 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1203 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1204 nd6_prefix_ref(search);
1212 nd6_prefix_lookup(struct nd_prefixctl *key)
1214 struct nd_prefix *search;
1217 search = nd6_prefix_lookup_locked(key);
1223 nd6_prefix_ref(struct nd_prefix *pr)
1226 refcount_acquire(&pr->ndpr_refcnt);
1230 nd6_prefix_rele(struct nd_prefix *pr)
1233 if (refcount_release(&pr->ndpr_refcnt)) {
1234 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1235 ("prefix %p has advertising routers", pr));
1241 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1242 struct nd_prefix **newp)
1244 struct nd_prefix *new;
1245 char ip6buf[INET6_ADDRSTRLEN];
1248 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1251 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1252 new->ndpr_ifp = pr->ndpr_ifp;
1253 new->ndpr_prefix = pr->ndpr_prefix;
1254 new->ndpr_plen = pr->ndpr_plen;
1255 new->ndpr_vltime = pr->ndpr_vltime;
1256 new->ndpr_pltime = pr->ndpr_pltime;
1257 new->ndpr_flags = pr->ndpr_flags;
1258 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1259 free(new, M_IP6NDP);
1262 new->ndpr_lastupdate = time_uptime;
1264 /* initialization */
1265 LIST_INIT(&new->ndpr_advrtrs);
1266 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1267 /* make prefix in the canonical form */
1268 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1271 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1275 /* ND_OPT_PI_FLAG_ONLINK processing */
1276 if (new->ndpr_raf_onlink) {
1277 struct epoch_tracker et;
1280 NET_EPOCH_ENTER(et);
1281 if ((error = nd6_prefix_onlink(new)) != 0) {
1282 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1283 "the prefix %s/%d on-link on %s (errno=%d)\n",
1284 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1285 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1286 /* proceed anyway. XXX: is it correct? */
1289 ND6_ONLINK_UNLOCK();
1293 pfxrtr_add(new, dr);
1300 * Remove a prefix from the prefix list and optionally stash it in a
1301 * caller-provided list.
1303 * The ND6 lock must be held.
1306 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1311 LIST_REMOVE(pr, ndpr_entry);
1314 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1318 * Free an unlinked prefix, first marking it off-link if necessary.
1321 nd6_prefix_del(struct nd_prefix *pr)
1323 struct nd_pfxrouter *pfr, *next;
1325 char ip6buf[INET6_ADDRSTRLEN];
1327 KASSERT(pr->ndpr_addrcnt == 0,
1328 ("prefix %p has referencing addresses", pr));
1329 ND6_UNLOCK_ASSERT();
1332 * Though these flags are now meaningless, we'd rather keep the value
1333 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1334 * when executing "ndp -p".
1336 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1338 if ((e = nd6_prefix_offlink(pr)) != 0) {
1340 "nd6_prefix_del: failed to make %s/%d offlink "
1341 "on %s, errno=%d\n",
1342 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1343 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1344 /* what should we do? */
1346 ND6_ONLINK_UNLOCK();
1349 /* Release references to routers that have advertised this prefix. */
1351 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1355 nd6_prefix_rele(pr);
1357 pfxlist_onlink_check();
1361 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1362 struct mbuf *m, int mcast)
1364 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1366 struct ifnet *ifp = new->ndpr_ifp;
1367 struct nd_prefix *pr;
1370 struct in6_addrlifetime lt6_tmp;
1371 char ip6buf[INET6_ADDRSTRLEN];
1378 * Authenticity for NA consists authentication for
1379 * both IP header and IP datagrams, doesn't it ?
1381 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1382 auth = ((m->m_flags & M_AUTHIPHDR) &&
1383 (m->m_flags & M_AUTHIPDGM));
1387 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1389 * nd6_prefix_lookup() ensures that pr and new have the same
1390 * prefix on a same interface.
1394 * Update prefix information. Note that the on-link (L) bit
1395 * and the autonomous (A) bit should NOT be changed from 1
1398 if (new->ndpr_raf_onlink == 1)
1399 pr->ndpr_raf_onlink = 1;
1400 if (new->ndpr_raf_auto == 1)
1401 pr->ndpr_raf_auto = 1;
1402 if (new->ndpr_raf_onlink) {
1403 pr->ndpr_vltime = new->ndpr_vltime;
1404 pr->ndpr_pltime = new->ndpr_pltime;
1405 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1406 pr->ndpr_lastupdate = time_uptime;
1409 if (new->ndpr_raf_onlink &&
1410 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1412 if ((error = nd6_prefix_onlink(pr)) != 0) {
1414 "prelist_update: failed to make "
1415 "the prefix %s/%d on-link on %s "
1418 &pr->ndpr_prefix.sin6_addr),
1419 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1421 /* proceed anyway. XXX: is it correct? */
1423 ND6_ONLINK_UNLOCK();
1429 if (new->ndpr_vltime == 0)
1431 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1434 error = nd6_prelist_add(new, dr, &pr);
1436 nd6log((LOG_NOTICE, "prelist_update: "
1437 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1438 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1439 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1440 goto end; /* we should just give up in this case. */
1444 * XXX: from the ND point of view, we can ignore a prefix
1445 * with the on-link bit being zero. However, we need a
1446 * prefix structure for references from autoconfigured
1447 * addresses. Thus, we explicitly make sure that the prefix
1448 * itself expires now.
1450 if (pr->ndpr_raf_onlink == 0) {
1451 pr->ndpr_vltime = 0;
1452 pr->ndpr_pltime = 0;
1453 in6_init_prefix_ltimes(pr);
1458 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1459 * Note that pr must be non NULL at this point.
1462 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1463 if (!new->ndpr_raf_auto)
1467 * 5.5.3 (b). the link-local prefix should have been ignored in
1471 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1472 if (new->ndpr_pltime > new->ndpr_vltime) {
1473 error = EINVAL; /* XXX: won't be used */
1478 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1479 * an address configured by stateless autoconfiguration already in the
1480 * list of addresses associated with the interface, and the Valid
1481 * Lifetime is not 0, form an address. We first check if we have
1482 * a matching prefix.
1483 * Note: we apply a clarification in rfc2462bis-02 here. We only
1484 * consider autoconfigured addresses while RFC2462 simply said
1487 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1488 struct in6_ifaddr *ifa6;
1489 u_int32_t remaininglifetime;
1491 if (ifa->ifa_addr->sa_family != AF_INET6)
1494 ifa6 = (struct in6_ifaddr *)ifa;
1497 * We only consider autoconfigured addresses as per rfc2462bis.
1499 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1503 * Spec is not clear here, but I believe we should concentrate
1504 * on unicast (i.e. not anycast) addresses.
1505 * XXX: other ia6_flags? detached or duplicated?
1507 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1511 * Ignore the address if it is not associated with a prefix
1512 * or is associated with a prefix that is different from this
1513 * one. (pr is never NULL here)
1515 if (ifa6->ia6_ndpr != pr)
1518 if (ia6_match == NULL) /* remember the first one */
1522 * An already autoconfigured address matched. Now that we
1523 * are sure there is at least one matched address, we can
1524 * proceed to 5.5.3. (e): update the lifetimes according to the
1525 * "two hours" rule and the privacy extension.
1526 * We apply some clarifications in rfc2462bis:
1527 * - use remaininglifetime instead of storedlifetime as a
1529 * - remove the dead code in the "two-hour" rule
1531 #define TWOHOUR (120*60)
1532 lt6_tmp = ifa6->ia6_lifetime;
1534 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1535 remaininglifetime = ND6_INFINITE_LIFETIME;
1536 else if (time_uptime - ifa6->ia6_updatetime >
1537 lt6_tmp.ia6t_vltime) {
1539 * The case of "invalid" address. We should usually
1540 * not see this case.
1542 remaininglifetime = 0;
1544 remaininglifetime = lt6_tmp.ia6t_vltime -
1545 (time_uptime - ifa6->ia6_updatetime);
1547 /* when not updating, keep the current stored lifetime. */
1548 lt6_tmp.ia6t_vltime = remaininglifetime;
1550 if (TWOHOUR < new->ndpr_vltime ||
1551 remaininglifetime < new->ndpr_vltime) {
1552 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1553 } else if (remaininglifetime <= TWOHOUR) {
1555 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1559 * new->ndpr_vltime <= TWOHOUR &&
1560 * TWOHOUR < remaininglifetime
1562 lt6_tmp.ia6t_vltime = TWOHOUR;
1565 /* The 2 hour rule is not imposed for preferred lifetime. */
1566 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1568 in6_init_address_ltimes(pr, <6_tmp);
1571 * We need to treat lifetimes for temporary addresses
1572 * differently, according to
1573 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1574 * we only update the lifetimes when they are in the maximum
1577 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1578 u_int32_t maxvltime, maxpltime;
1580 if (V_ip6_temp_valid_lifetime >
1581 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1582 V_ip6_desync_factor)) {
1583 maxvltime = V_ip6_temp_valid_lifetime -
1584 (time_uptime - ifa6->ia6_createtime) -
1585 V_ip6_desync_factor;
1588 if (V_ip6_temp_preferred_lifetime >
1589 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1590 V_ip6_desync_factor)) {
1591 maxpltime = V_ip6_temp_preferred_lifetime -
1592 (time_uptime - ifa6->ia6_createtime) -
1593 V_ip6_desync_factor;
1597 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1598 lt6_tmp.ia6t_vltime > maxvltime) {
1599 lt6_tmp.ia6t_vltime = maxvltime;
1601 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1602 lt6_tmp.ia6t_pltime > maxpltime) {
1603 lt6_tmp.ia6t_pltime = maxpltime;
1606 ifa6->ia6_lifetime = lt6_tmp;
1607 ifa6->ia6_updatetime = time_uptime;
1609 if (ia6_match == NULL && new->ndpr_vltime) {
1613 * 5.5.3 (d) (continued)
1614 * No address matched and the valid lifetime is non-zero.
1615 * Create a new address.
1619 * Prefix Length check:
1620 * If the sum of the prefix length and interface identifier
1621 * length does not equal 128 bits, the Prefix Information
1622 * option MUST be ignored. The length of the interface
1623 * identifier is defined in a separate link-type specific
1626 ifidlen = in6_if2idlen(ifp);
1628 /* this should not happen, so we always log it. */
1629 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1633 if (ifidlen + pr->ndpr_plen != 128) {
1635 "prelist_update: invalid prefixlen "
1636 "%d for %s, ignored\n",
1637 pr->ndpr_plen, if_name(ifp)));
1641 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1643 * note that we should use pr (not new) for reference.
1650 * When a new public address is created as described
1651 * in RFC2462, also create a new temporary address.
1654 * When an interface connects to a new link, a new
1655 * randomized interface identifier should be generated
1656 * immediately together with a new set of temporary
1657 * addresses. Thus, we specifiy 1 as the 2nd arg of
1660 if (V_ip6_use_tempaddr) {
1662 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1663 nd6log((LOG_NOTICE, "prelist_update: "
1664 "failed to create a temporary "
1665 "address, errno=%d\n",
1669 ifa_free(&ia6->ia_ifa);
1672 * A newly added address might affect the status
1673 * of other addresses, so we check and update it.
1674 * XXX: what if address duplication happens?
1676 pfxlist_onlink_check();
1678 /* just set an error. do not bark here. */
1679 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1685 nd6_prefix_rele(pr);
1690 * A supplement function used in the on-link detection below;
1691 * detect if a given prefix has a (probably) reachable advertising router.
1692 * XXX: lengthy function name...
1694 static struct nd_pfxrouter *
1695 find_pfxlist_reachable_router(struct nd_prefix *pr)
1697 struct epoch_tracker et;
1698 struct nd_pfxrouter *pfxrtr;
1704 NET_EPOCH_ENTER(et);
1705 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1706 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1709 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1719 * Check if each prefix in the prefix list has at least one available router
1720 * that advertised the prefix (a router is "available" if its neighbor cache
1721 * entry is reachable or probably reachable).
1722 * If the check fails, the prefix may be off-link, because, for example,
1723 * we have moved from the network but the lifetime of the prefix has not
1724 * expired yet. So we should not use the prefix if there is another prefix
1725 * that has an available router.
1726 * But, if there is no prefix that has an available router, we still regard
1727 * all the prefixes as on-link. This is because we can't tell if all the
1728 * routers are simply dead or if we really moved from the network and there
1729 * is no router around us.
1732 pfxlist_onlink_check(void)
1734 struct nd_prefix *pr;
1735 struct in6_ifaddr *ifa;
1736 struct nd_defrouter *dr;
1737 struct nd_pfxrouter *pfxrtr = NULL;
1738 struct rm_priotracker in6_ifa_tracker;
1746 * Check if there is a prefix that has a reachable advertising
1749 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1750 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1755 * If we have no such prefix, check whether we still have a router
1756 * that does not advertise any prefixes.
1759 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1760 struct nd_prefix *pr0;
1762 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1763 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1770 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1772 * There is at least one prefix that has a reachable router,
1773 * or at least a router which probably does not advertise
1774 * any prefixes. The latter would be the case when we move
1775 * to a new link where we have a router that does not provide
1776 * prefixes and we configure an address by hand.
1777 * Detach prefixes which have no reachable advertising
1778 * router, and attach other prefixes.
1780 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1781 /* XXX: a link-local prefix should never be detached */
1782 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1783 pr->ndpr_raf_onlink == 0 ||
1784 pr->ndpr_raf_auto == 0)
1787 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1788 find_pfxlist_reachable_router(pr) == NULL)
1789 pr->ndpr_stateflags |= NDPRF_DETACHED;
1790 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1791 find_pfxlist_reachable_router(pr) != NULL)
1792 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1795 /* there is no prefix that has a reachable router */
1796 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1797 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1798 pr->ndpr_raf_onlink == 0 ||
1799 pr->ndpr_raf_auto == 0)
1801 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1806 * Remove each interface route associated with a (just) detached
1807 * prefix, and reinstall the interface route for a (just) attached
1808 * prefix. Note that all attempt of reinstallation does not
1809 * necessarily success, when a same prefix is shared among multiple
1810 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1811 * so we don't have to care about them.
1814 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1815 char ip6buf[INET6_ADDRSTRLEN];
1818 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1819 pr->ndpr_raf_onlink == 0 ||
1820 pr->ndpr_raf_auto == 0)
1823 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1824 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1825 genid = V_nd6_list_genid;
1827 if ((flags & NDPRF_ONLINK) != 0 &&
1828 (e = nd6_prefix_offlink(pr)) != 0) {
1830 "pfxlist_onlink_check: failed to "
1831 "make %s/%d offlink, errno=%d\n",
1833 &pr->ndpr_prefix.sin6_addr),
1835 } else if ((flags & NDPRF_ONLINK) == 0 &&
1836 (e = nd6_prefix_onlink(pr)) != 0) {
1838 "pfxlist_onlink_check: failed to "
1839 "make %s/%d onlink, errno=%d\n",
1841 &pr->ndpr_prefix.sin6_addr),
1845 if (genid != V_nd6_list_genid)
1851 * Changes on the prefix status might affect address status as well.
1852 * Make sure that all addresses derived from an attached prefix are
1853 * attached, and that all addresses derived from a detached prefix are
1854 * detached. Note, however, that a manually configured address should
1855 * always be attached.
1856 * The precise detection logic is same as the one for prefixes.
1858 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1859 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1860 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1863 if (ifa->ia6_ndpr == NULL) {
1865 * This can happen when we first configure the address
1866 * (i.e. the address exists, but the prefix does not).
1867 * XXX: complicated relationships...
1872 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1876 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1877 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1880 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1883 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1884 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1885 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1886 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1887 nd6_dad_start((struct ifaddr *)ifa, 0);
1890 ifa->ia6_flags |= IN6_IFF_DETACHED;
1894 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1895 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1898 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1899 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1900 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1901 /* Do we need a delay in this case? */
1902 nd6_dad_start((struct ifaddr *)ifa, 0);
1906 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1908 ND6_ONLINK_UNLOCK();
1912 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1914 struct sockaddr_dl sdl;
1916 struct sockaddr_in6 mask6;
1918 int error, a_failure, fibnum, maxfib;
1921 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1922 * ifa->ifa_rtrequest = nd6_rtrequest;
1924 bzero(&mask6, sizeof(mask6));
1925 mask6.sin6_len = sizeof(mask6);
1926 mask6.sin6_addr = pr->ndpr_mask;
1927 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1929 bzero(&sdl, sizeof(struct sockaddr_dl));
1930 sdl.sdl_len = sizeof(struct sockaddr_dl);
1931 sdl.sdl_family = AF_LINK;
1932 sdl.sdl_type = ifa->ifa_ifp->if_type;
1933 sdl.sdl_index = ifa->ifa_ifp->if_index;
1935 if(V_rt_add_addr_allfibs) {
1937 maxfib = rt_numfibs;
1939 fibnum = ifa->ifa_ifp->if_fib;
1940 maxfib = fibnum + 1;
1943 for (; fibnum < maxfib; fibnum++) {
1946 error = in6_rtrequest(RTM_ADD,
1947 (struct sockaddr *)&pr->ndpr_prefix, (struct sockaddr *)&sdl,
1948 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1950 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1951 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1954 nd6_rtmsg(RTM_ADD, rt);
1956 pr->ndpr_stateflags |= NDPRF_ONLINK;
1958 char ip6buf[INET6_ADDRSTRLEN];
1959 char ip6bufg[INET6_ADDRSTRLEN];
1960 char ip6bufm[INET6_ADDRSTRLEN];
1961 struct sockaddr_in6 *sin6;
1963 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1964 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1965 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1966 "flags=%lx errno = %d\n",
1967 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1968 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1969 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1970 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1973 /* Save last error to return, see rtinit(). */
1984 /* Return the last error we got. */
1989 nd6_prefix_onlink(struct nd_prefix *pr)
1991 struct epoch_tracker et;
1993 struct ifnet *ifp = pr->ndpr_ifp;
1994 struct nd_prefix *opr;
1995 char ip6buf[INET6_ADDRSTRLEN];
1998 ND6_ONLINK_LOCK_ASSERT();
1999 ND6_UNLOCK_ASSERT();
2001 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
2005 * Add the interface route associated with the prefix. Before
2006 * installing the route, check if there's the same prefix on another
2007 * interface, and the prefix has already installed the interface route.
2008 * Although such a configuration is expected to be rare, we explicitly
2012 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2016 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2019 if (!V_rt_add_addr_allfibs &&
2020 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
2023 if (opr->ndpr_plen == pr->ndpr_plen &&
2024 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2025 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2033 * We prefer link-local addresses as the associated interface address.
2035 /* search for a link-local addr */
2036 NET_EPOCH_ENTER(et);
2037 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
2038 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
2040 /* XXX: freebsd does not have ifa_ifwithaf */
2041 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2042 if (ifa->ifa_addr->sa_family == AF_INET6) {
2047 /* should we care about ia6_flags? */
2052 * This can still happen, when, for example, we receive an RA
2053 * containing a prefix with the L bit set and the A bit clear,
2054 * after removing all IPv6 addresses on the receiving
2055 * interface. This should, of course, be rare though.
2058 "nd6_prefix_onlink: failed to find any ifaddr"
2059 " to add route for a prefix(%s/%d) on %s\n",
2060 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2061 pr->ndpr_plen, if_name(ifp)));
2065 error = nd6_prefix_onlink_rtrequest(pr, ifa);
2074 nd6_prefix_offlink(struct nd_prefix *pr)
2077 struct ifnet *ifp = pr->ndpr_ifp;
2078 struct nd_prefix *opr;
2079 struct sockaddr_in6 sa6, mask6;
2081 char ip6buf[INET6_ADDRSTRLEN];
2083 int fibnum, maxfib, a_failure;
2085 ND6_ONLINK_LOCK_ASSERT();
2086 ND6_UNLOCK_ASSERT();
2088 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2091 bzero(&sa6, sizeof(sa6));
2092 sa6.sin6_family = AF_INET6;
2093 sa6.sin6_len = sizeof(sa6);
2094 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2095 sizeof(struct in6_addr));
2096 bzero(&mask6, sizeof(mask6));
2097 mask6.sin6_family = AF_INET6;
2098 mask6.sin6_len = sizeof(sa6);
2099 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2101 if (V_rt_add_addr_allfibs) {
2103 maxfib = rt_numfibs;
2105 fibnum = ifp->if_fib;
2106 maxfib = fibnum + 1;
2110 for (; fibnum < maxfib; fibnum++) {
2112 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
2113 (struct sockaddr *)&mask6, 0, &rt, fibnum);
2115 /* report the route deletion to the routing socket. */
2117 nd6_rtmsg(RTM_DELETE, rt);
2119 /* Save last error to return, see rtinit(). */
2129 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2132 * There might be the same prefix on another interface,
2133 * the prefix which could not be on-link just because we have
2134 * the interface route (see comments in nd6_prefix_onlink).
2135 * If there's one, try to make the prefix on-link on the
2140 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2142 * KAME specific: detached prefixes should not be
2145 if (opr == pr || (opr->ndpr_stateflags &
2146 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2149 if (opr->ndpr_plen == pr->ndpr_plen &&
2150 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2151 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2154 genid = V_nd6_list_genid;
2156 if ((e = nd6_prefix_onlink(opr)) != 0) {
2158 "nd6_prefix_offlink: failed to "
2159 "recover a prefix %s/%d from %s "
2160 "to %s (errno = %d)\n",
2162 &opr->ndpr_prefix.sin6_addr),
2163 opr->ndpr_plen, if_name(ifp),
2164 if_name(opr->ndpr_ifp), e));
2168 if (genid != V_nd6_list_genid)
2174 /* XXX: can we still set the NDPRF_ONLINK flag? */
2176 "nd6_prefix_offlink: failed to delete route: "
2177 "%s/%d on %s (errno = %d)\n",
2178 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
2179 if_name(ifp), error));
2183 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2184 (struct sockaddr *)&mask6, LLE_STATIC);
2189 static struct in6_ifaddr *
2190 in6_ifadd(struct nd_prefixctl *pr, int mcast)
2192 struct ifnet *ifp = pr->ndpr_ifp;
2194 struct in6_aliasreq ifra;
2195 struct in6_ifaddr *ia, *ib;
2197 struct in6_addr mask;
2198 int prefixlen = pr->ndpr_plen;
2200 char ip6buf[INET6_ADDRSTRLEN];
2202 in6_prefixlen2mask(&mask, prefixlen);
2205 * find a link-local address (will be interface ID).
2206 * Is it really mandatory? Theoretically, a global or a site-local
2207 * address can be configured without a link-local address, if we
2208 * have a unique interface identifier...
2210 * it is not mandatory to have a link-local address, we can generate
2211 * interface identifier on the fly. we do this because:
2212 * (1) it should be the easiest way to find interface identifier.
2213 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
2214 * for multiple addresses on a single interface, and possible shortcut
2215 * of DAD. we omitted DAD for this reason in the past.
2216 * (3) a user can prevent autoconfiguration of global address
2217 * by removing link-local address by hand (this is partly because we
2218 * don't have other way to control the use of IPv6 on an interface.
2219 * this has been our design choice - cf. NRL's "ifconfig auto").
2220 * (4) it is easier to manage when an interface has addresses
2221 * with the same interface identifier, than to have multiple addresses
2222 * with different interface identifiers.
2224 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
2226 ib = (struct in6_ifaddr *)ifa;
2230 /* prefixlen + ifidlen must be equal to 128 */
2231 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
2232 if (prefixlen != plen0) {
2234 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
2235 "(prefix=%d ifid=%d)\n",
2236 if_name(ifp), prefixlen, 128 - plen0));
2241 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
2243 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
2245 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
2246 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
2247 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
2248 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
2249 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2250 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
2251 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2252 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
2256 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
2257 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
2259 /* XXX: scope zone ID? */
2261 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
2264 * Make sure that we do not have this address already. This should
2265 * usually not happen, but we can still see this case, e.g., if we
2266 * have manually configured the exact address to be configured.
2268 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
2269 &ifra.ifra_addr.sin6_addr);
2272 /* this should be rare enough to make an explicit log */
2273 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
2274 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
2279 * Allocate ifaddr structure, link into chain, etc.
2280 * If we are going to create a new address upon receiving a multicasted
2281 * RA, we need to impose a random delay before starting DAD.
2282 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
2286 updateflags |= IN6_IFAUPDATE_DADDELAY;
2287 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
2289 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
2290 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
2291 if_name(ifp), error));
2292 return (NULL); /* ifaddr must not have been allocated. */
2295 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2297 * XXXRW: Assumption of non-NULLness here might not be true with
2298 * fine-grained locking -- should we validate it? Or just return
2299 * earlier ifa rather than looking it up again?
2301 return (ia); /* this is always non-NULL and referenced. */
2305 * ia0 - corresponding public address
2308 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2310 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2311 struct in6_ifaddr *newia;
2312 struct in6_aliasreq ifra;
2314 int trylimit = 3; /* XXX: adhoc value */
2316 u_int32_t randid[2];
2317 time_t vltime0, pltime0;
2319 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2320 &ia0->ia_prefixmask.sin6_addr);
2322 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2323 /* clear the old IFID */
2324 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2325 &ifra.ifra_prefixmask.sin6_addr);
2328 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2329 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2330 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2334 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2335 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2336 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2337 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2340 * in6_get_tmpifid() quite likely provided a unique interface ID.
2341 * However, we may still have a chance to see collision, because
2342 * there may be a time lag between generation of the ID and generation
2343 * of the address. So, we'll do one more sanity check.
2346 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2347 if (trylimit-- > 0) {
2352 /* Give up. Something strange should have happened. */
2353 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2354 "find a unique random IFID\n"));
2359 * The Valid Lifetime is the lower of the Valid Lifetime of the
2360 * public address or TEMP_VALID_LIFETIME.
2361 * The Preferred Lifetime is the lower of the Preferred Lifetime
2362 * of the public address or TEMP_PREFERRED_LIFETIME -
2365 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2366 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2367 (ia0->ia6_lifetime.ia6t_vltime -
2368 (time_uptime - ia0->ia6_updatetime));
2369 if (vltime0 > V_ip6_temp_valid_lifetime)
2370 vltime0 = V_ip6_temp_valid_lifetime;
2372 vltime0 = V_ip6_temp_valid_lifetime;
2373 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2374 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2375 (ia0->ia6_lifetime.ia6t_pltime -
2376 (time_uptime - ia0->ia6_updatetime));
2377 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2378 pltime0 = V_ip6_temp_preferred_lifetime -
2379 V_ip6_desync_factor;
2382 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2383 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2384 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2387 * A temporary address is created only if this calculated Preferred
2388 * Lifetime is greater than REGEN_ADVANCE time units.
2390 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2393 /* XXX: scope zone ID? */
2395 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2397 /* allocate ifaddr structure, link into chain, etc. */
2400 updateflags |= IN6_IFAUPDATE_DADDELAY;
2401 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2404 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2405 if (newia == NULL) { /* XXX: can it happen? */
2407 "in6_tmpifadd: ifa update succeeded, but we got "
2409 return (EINVAL); /* XXX */
2411 newia->ia6_ndpr = ia0->ia6_ndpr;
2412 newia->ia6_ndpr->ndpr_addrcnt++;
2413 ifa_free(&newia->ia_ifa);
2416 * A newly added address might affect the status of other addresses.
2417 * XXX: when the temporary address is generated with a new public
2418 * address, the onlink check is redundant. However, it would be safe
2419 * to do the check explicitly everywhere a new address is generated,
2420 * and, in fact, we surely need the check when we create a new
2421 * temporary address due to deprecation of an old temporary address.
2423 pfxlist_onlink_check();
2429 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2431 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2432 ndpr->ndpr_preferred = 0;
2434 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2435 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2436 ndpr->ndpr_expire = 0;
2438 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2444 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2446 /* init ia6t_expire */
2447 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2448 lt6->ia6t_expire = 0;
2450 lt6->ia6t_expire = time_uptime;
2451 lt6->ia6t_expire += lt6->ia6t_vltime;
2454 /* init ia6t_preferred */
2455 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2456 lt6->ia6t_preferred = 0;
2458 lt6->ia6t_preferred = time_uptime;
2459 lt6->ia6t_preferred += lt6->ia6t_pltime;
2464 * Delete all the routing table entries that use the specified gateway.
2465 * XXX: this function causes search through all entries of routing table, so
2466 * it shouldn't be called when acting as a router.
2469 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2472 /* We'll care only link-local addresses */
2473 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2476 /* XXX Do we really need to walk any but the default FIB? */
2477 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2481 rt6_deleteroute(const struct rtentry *rt, void *arg)
2483 #define SIN6(s) ((struct sockaddr_in6 *)s)
2484 struct in6_addr *gate = (struct in6_addr *)arg;
2486 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2489 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2494 * Do not delete a static route.
2495 * XXX: this seems to be a bit ad-hoc. Should we consider the
2496 * 'cloned' bit instead?
2498 if ((rt->rt_flags & RTF_STATIC) != 0)
2502 * We delete only host route. This means, in particular, we don't
2503 * delete default route.
2505 if ((rt->rt_flags & RTF_HOST) == 0)
2513 nd6_setdefaultiface(int ifindex)
2517 if (ifindex < 0 || V_if_index < ifindex)
2519 if (ifindex != 0 && !ifnet_byindex(ifindex))
2522 if (V_nd6_defifindex != ifindex) {
2523 V_nd6_defifindex = ifindex;
2524 if (V_nd6_defifindex > 0)
2525 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2527 V_nd6_defifp = NULL;
2530 * Our current implementation assumes one-to-one maping between
2531 * interfaces and links, so it would be natural to use the
2532 * default interface as the default link.
2534 scope6_setdefault(V_nd6_defifp);
2541 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2543 struct in6_defrouter d;
2544 struct nd_defrouter *dr;
2547 if (req->newptr != NULL)
2550 error = sysctl_wire_old_buffer(req, 0);
2554 bzero(&d, sizeof(d));
2555 d.rtaddr.sin6_family = AF_INET6;
2556 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2559 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
2560 d.rtaddr.sin6_addr = dr->rtaddr;
2561 error = sa6_recoverscope(&d.rtaddr);
2564 d.flags = dr->raflags;
2565 d.rtlifetime = dr->rtlifetime;
2566 d.expire = dr->expire + (time_second - time_uptime);
2567 d.if_index = dr->ifp->if_index;
2568 error = SYSCTL_OUT(req, &d, sizeof(d));
2575 SYSCTL_DECL(_net_inet6_icmp6);
2576 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2577 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2578 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
2579 "NDP default router list");
2582 nd6_defrouter_list_empty(void)
2585 return (TAILQ_EMPTY(&V_nd_defrouter));
2589 nd6_defrouter_timer(void)
2591 struct nd_defrouter *dr, *ndr;
2592 struct nd_drhead drq;
2597 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr)
2598 if (dr->expire && dr->expire < time_uptime)
2599 defrouter_unlink(dr, &drq);
2602 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2603 TAILQ_REMOVE(&drq, dr, dr_entry);
2609 * Nuke default router list entries toward ifp.
2610 * We defer removal of default router list entries that is installed in the
2611 * routing table, in order to keep additional side effects as small as possible.
2614 nd6_defrouter_purge(struct ifnet *ifp)
2616 struct nd_defrouter *dr, *ndr;
2617 struct nd_drhead drq;
2622 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
2626 defrouter_unlink(dr, &drq);
2628 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
2632 defrouter_unlink(dr, &drq);
2636 /* Delete the unlinked router objects. */
2637 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2638 TAILQ_REMOVE(&drq, dr, dr_entry);
2644 nd6_defrouter_flush_all(void)
2646 struct nd_defrouter *dr;
2647 struct nd_drhead drq;
2652 while ((dr = TAILQ_FIRST(&V_nd_defrouter)) != NULL)
2653 defrouter_unlink(dr, &drq);
2656 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2657 TAILQ_REMOVE(&drq, dr, dr_entry);
2663 nd6_defrouter_init(void)
2666 TAILQ_INIT(&V_nd_defrouter);