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 struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
77 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
79 static int nd6_prefix_onlink(struct nd_prefix *);
81 TAILQ_HEAD(nd6_drhead, nd_defrouter);
82 VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter);
83 #define V_nd6_defrouter VNET(nd6_defrouter)
85 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
86 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
88 VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp);
89 VNET_DEFINE(int, nd6_defifindex);
90 #define V_nd6_defifp VNET(nd6_defifp)
92 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
94 VNET_DEFINE(int, ip6_desync_factor);
95 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
96 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
98 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
101 VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
104 SYSCTL_DECL(_net_inet6_icmp6);
106 /* RTPREF_MEDIUM has to be 0! */
107 #define RTPREF_HIGH 1
108 #define RTPREF_MEDIUM 0
109 #define RTPREF_LOW (-1)
110 #define RTPREF_RESERVED (-2)
111 #define RTPREF_INVALID (-3) /* internal */
114 defrouter_ref(struct nd_defrouter *dr)
117 refcount_acquire(&dr->refcnt);
121 defrouter_rele(struct nd_defrouter *dr)
124 if (refcount_release(&dr->refcnt))
129 * Remove a router from the global list and optionally stash it in a
130 * caller-supplied queue.
133 defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq)
138 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
141 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
145 * Receive Router Solicitation Message - just for routers.
146 * Router solicitation/advertisement is mostly managed by userland program
147 * (rtadvd) so here we have no function like nd6_ra_output().
152 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
156 struct nd_router_solicit *nd_rs;
157 struct in6_addr saddr6;
158 union nd_opts ndopts;
159 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
163 ifp = m->m_pkthdr.rcvif;
166 * Accept RS only when V_ip6_forwarding=1 and the interface has
167 * no ND6_IFF_ACCEPT_RTADV.
169 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
172 /* RFC 6980: Nodes MUST silently ignore fragments */
173 if(m->m_flags & M_FRAGMENTED)
177 ip6 = mtod(m, struct ip6_hdr *);
178 if (ip6->ip6_hlim != 255) {
180 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
181 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
182 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
187 * Don't update the neighbor cache, if src = ::.
188 * This indicates that the src has no IP address assigned yet.
190 saddr6 = ip6->ip6_src;
191 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
194 if (m->m_len < off + icmp6len) {
195 m = m_pullup(m, off + icmp6len);
197 IP6STAT_INC(ip6s_exthdrtoolong);
201 ip6 = mtod(m, struct ip6_hdr *);
202 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
204 icmp6len -= sizeof(*nd_rs);
205 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
206 if (nd6_options(&ndopts) < 0) {
208 "%s: invalid ND option, ignored\n", __func__));
209 /* nd6_options have incremented stats */
215 if (ndopts.nd_opts_src_lladdr) {
216 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
217 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
220 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
222 "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n",
223 __func__, ip6_sprintf(ip6bufs, &saddr6),
224 ifp->if_addrlen, lladdrlen - 2));
228 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
235 ICMP6STAT_INC(icp6s_badrs);
241 * An initial update routine for draft-ietf-6man-ipv6only-flag.
242 * We need to iterate over all default routers for the given
243 * interface to see whether they are all advertising the "S"
244 * (IPv6-Only) flag. If they do set, otherwise unset, the
245 * interface flag we later use to filter on.
248 defrtr_ipv6_only_ifp(struct ifnet *ifp)
250 struct nd_defrouter *dr;
251 bool ipv6_only, ipv6_only_old;
253 struct epoch_tracker et;
258 if (V_nd6_ignore_ipv6_only_ra != 0)
263 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
264 if (dr->ifp == ifp &&
265 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
269 IF_AFDATA_WLOCK(ifp);
270 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
271 IF_AFDATA_WUNLOCK(ifp);
273 /* If nothing changed, we have an early exit. */
274 if (ipv6_only == ipv6_only_old)
279 * Should we want to set the IPV6-ONLY flag, check if the
280 * interface has a non-0/0 and non-link-local IPv4 address
281 * configured on it. If it has we will assume working
282 * IPv4 operations and will clear the interface flag.
284 has_ipv4_addr = false;
287 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
288 if (ifa->ifa_addr->sa_family != AF_INET)
291 satosin(ifa->ifa_addr)->sin_addr)) {
292 has_ipv4_addr = true;
298 if (ipv6_only && has_ipv4_addr) {
299 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
300 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
305 IF_AFDATA_WLOCK(ifp);
307 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
309 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
310 IF_AFDATA_WUNLOCK(ifp);
313 /* Send notification of flag change. */
318 defrtr_ipv6_only_ipf_down(struct ifnet *ifp)
321 IF_AFDATA_WLOCK(ifp);
322 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
323 IF_AFDATA_WUNLOCK(ifp);
325 #endif /* EXPERIMENTAL */
328 nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
332 * XXX-BZ we might want to trigger re-evaluation of our default router
333 * availability. E.g., on link down the default router might be
334 * unreachable but a different interface might still have connectivity.
338 if (linkstate == LINK_STATE_DOWN)
339 defrtr_ipv6_only_ipf_down(ifp);
344 * Receive Router Advertisement Message.
347 * TODO: on-link bit on prefix information
348 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
351 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
354 struct nd_ifinfo *ndi;
356 struct nd_router_advert *nd_ra;
357 struct in6_addr saddr6;
358 struct nd_defrouter *dr;
359 union nd_opts ndopts;
360 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
364 * We only accept RAs only when the per-interface flag
365 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
367 ifp = m->m_pkthdr.rcvif;
368 ndi = ND_IFINFO(ifp);
369 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
372 /* RFC 6980: Nodes MUST silently ignore fragments */
373 if(m->m_flags & M_FRAGMENTED)
376 ip6 = mtod(m, struct ip6_hdr *);
377 if (ip6->ip6_hlim != 255) {
379 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
380 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
381 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
385 saddr6 = ip6->ip6_src;
386 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
388 "%s: src %s is not link-local\n", __func__,
389 ip6_sprintf(ip6bufs, &saddr6)));
393 if (m->m_len < off + icmp6len) {
394 m = m_pullup(m, off + icmp6len);
396 IP6STAT_INC(ip6s_exthdrtoolong);
400 ip6 = mtod(m, struct ip6_hdr *);
401 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
403 icmp6len -= sizeof(*nd_ra);
404 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
405 if (nd6_options(&ndopts) < 0) {
407 "%s: invalid ND option, ignored\n", __func__));
408 /* nd6_options have incremented stats */
415 struct nd_defrouter dr0;
416 u_int32_t advreachable = nd_ra->nd_ra_reachable;
418 /* remember if this is a multicasted advertisement */
419 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
422 bzero(&dr0, sizeof(dr0));
424 dr0.raflags = nd_ra->nd_ra_flags_reserved;
426 * Effectively-disable routes from RA messages when
427 * ND6_IFF_NO_RADR enabled on the receiving interface or
428 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
430 if (ndi->flags & ND6_IFF_NO_RADR)
432 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
435 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
436 dr0.expire = time_uptime + dr0.rtlifetime;
438 /* unspecified or not? (RFC 2461 6.3.4) */
440 advreachable = ntohl(advreachable);
441 if (advreachable <= MAX_REACHABLE_TIME &&
442 ndi->basereachable != advreachable) {
443 ndi->basereachable = advreachable;
444 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
445 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
448 if (nd_ra->nd_ra_retransmit)
449 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
450 if (nd_ra->nd_ra_curhoplimit) {
451 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
452 ndi->chlim = nd_ra->nd_ra_curhoplimit;
453 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
454 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
455 "%s on %s (current = %d, received = %d). "
456 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
457 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
460 dr = defrtrlist_update(&dr0);
462 defrtr_ipv6_only_ifp(ifp);
469 if (ndopts.nd_opts_pi) {
470 struct nd_opt_hdr *pt;
471 struct nd_opt_prefix_info *pi = NULL;
472 struct nd_prefixctl pr;
474 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
475 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
476 pt = (struct nd_opt_hdr *)((caddr_t)pt +
477 (pt->nd_opt_len << 3))) {
478 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
480 pi = (struct nd_opt_prefix_info *)pt;
482 if (pi->nd_opt_pi_len != 4) {
484 "%s: invalid option len %d for prefix "
485 "information option, ignored\n", __func__,
490 if (128 < pi->nd_opt_pi_prefix_len) {
492 "%s: invalid prefix len %d for prefix "
493 "information option, ignored\n", __func__,
494 pi->nd_opt_pi_prefix_len));
498 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
499 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
501 "%s: invalid prefix %s, ignored\n",
502 __func__, ip6_sprintf(ip6bufs,
503 &pi->nd_opt_pi_prefix)));
507 bzero(&pr, sizeof(pr));
508 pr.ndpr_prefix.sin6_family = AF_INET6;
509 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
510 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
511 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
513 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
514 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
515 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
516 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
517 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
518 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
519 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
520 (void)prelist_update(&pr, dr, m, mcast);
531 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
535 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
538 if (mtu < IPV6_MMTU) {
539 nd6log((LOG_INFO, "%s: bogus mtu option mtu=%lu sent "
540 "from %s, ignoring\n", __func__,
541 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
546 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
547 ? ndi->maxmtu : ifp->if_mtu;
549 int change = (ndi->linkmtu != mtu);
553 /* in6_maxmtu may change */
558 nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; "
559 "exceeds maxmtu %lu, ignoring\n", __func__,
560 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
567 * Source link layer address
573 if (ndopts.nd_opts_src_lladdr) {
574 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
575 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
578 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
580 "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n",
581 __func__, ip6_sprintf(ip6bufs, &saddr6),
582 ifp->if_addrlen, lladdrlen - 2));
586 nd6_cache_lladdr(ifp, &saddr6, lladdr,
587 lladdrlen, ND_ROUTER_ADVERT, 0);
590 * Installing a link-layer address might change the state of the
591 * router's neighbor cache, which might also affect our on-link
592 * detection of adveritsed prefixes.
594 pfxlist_onlink_check();
602 ICMP6STAT_INC(icp6s_badra);
606 /* tell the change to user processes watching the routing socket. */
608 nd6_rtmsg(int cmd, struct rtentry *rt)
611 rt_routemsg(cmd, rt, rt->rt_ifp, 0, rt->rt_fibnum);
615 static struct nd_pfxrouter *
616 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
618 struct nd_pfxrouter *search;
622 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
623 if (search->router == dr)
630 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
632 struct nd_pfxrouter *new;
638 if (pfxrtr_lookup(pr, dr) != NULL) {
644 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
651 if (pfxrtr_lookup(pr, dr) == NULL) {
652 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
655 /* We lost a race to add the reference. */
663 pfxlist_onlink_check();
667 pfxrtr_del(struct nd_pfxrouter *pfr)
672 LIST_REMOVE(pfr, pfr_entry);
673 defrouter_rele(pfr->router);
678 /* Default router list processing sub routines. */
680 defrouter_addreq(struct nd_defrouter *new)
682 struct sockaddr_in6 def, mask, gate;
683 struct rtentry *newrt = NULL;
686 bzero(&def, sizeof(def));
687 bzero(&mask, sizeof(mask));
688 bzero(&gate, sizeof(gate));
690 def.sin6_len = mask.sin6_len = gate.sin6_len =
691 sizeof(struct sockaddr_in6);
692 def.sin6_family = gate.sin6_family = AF_INET6;
693 gate.sin6_addr = new->rtaddr;
695 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
696 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
697 RTF_GATEWAY, &newrt, new->ifp->if_fib);
699 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
707 * Remove the default route for a given router.
708 * This is just a subroutine function for defrouter_select_fib(), and
709 * should not be called from anywhere else.
712 defrouter_delreq(struct nd_defrouter *dr)
714 struct sockaddr_in6 def, mask, gate;
715 struct rtentry *oldrt = NULL;
717 bzero(&def, sizeof(def));
718 bzero(&mask, sizeof(mask));
719 bzero(&gate, sizeof(gate));
721 def.sin6_len = mask.sin6_len = gate.sin6_len =
722 sizeof(struct sockaddr_in6);
723 def.sin6_family = gate.sin6_family = AF_INET6;
724 gate.sin6_addr = dr->rtaddr;
726 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
727 (struct sockaddr *)&gate,
728 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
730 nd6_rtmsg(RTM_DELETE, oldrt);
738 defrouter_del(struct nd_defrouter *dr)
740 struct nd_defrouter *deldr = NULL;
741 struct nd_prefix *pr;
742 struct nd_pfxrouter *pfxrtr;
747 * Flush all the routing table entries that use the router
750 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
751 rt6_flush(&dr->rtaddr, dr->ifp);
754 defrtr_ipv6_only_ifp(dr->ifp);
759 defrouter_delreq(dr);
763 * Also delete all the pointers to the router in each prefix lists.
766 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
767 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
772 pfxlist_onlink_check();
775 * If the router is the primary one, choose a new one.
776 * Note that defrouter_select_fib() will remove the current
777 * gateway from the routing table.
780 defrouter_select_fib(deldr->ifp->if_fib);
783 * Release the list reference.
789 struct nd_defrouter *
790 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
792 struct nd_defrouter *dr;
795 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
796 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
803 struct nd_defrouter *
804 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
806 struct nd_defrouter *dr;
809 dr = defrouter_lookup_locked(addr, ifp);
815 * Remove all default routes from default router list.
818 defrouter_reset(void)
820 struct nd_defrouter *dr, **dra;
826 * We can't delete routes with the ND lock held, so make a copy of the
827 * current default router list and use that when deleting routes.
830 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
834 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
837 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
845 for (i = 0; i < count && dra[i] != NULL; i++) {
846 defrouter_delreq(dra[i]);
847 defrouter_rele(dra[i]);
852 * XXX should we also nuke any default routers in the kernel, by
853 * going through them by rtalloc1()?
858 * Look up a matching default router list entry and remove it. Returns true if a
859 * matching entry was found, false otherwise.
862 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
864 struct nd_defrouter *dr;
867 dr = defrouter_lookup_locked(addr, ifp);
873 defrouter_unlink(dr, NULL);
881 * for default router selection
882 * regards router-preference field as a 2-bit signed integer
885 rtpref(struct nd_defrouter *dr)
887 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
888 case ND_RA_FLAG_RTPREF_HIGH:
889 return (RTPREF_HIGH);
890 case ND_RA_FLAG_RTPREF_MEDIUM:
891 case ND_RA_FLAG_RTPREF_RSV:
892 return (RTPREF_MEDIUM);
893 case ND_RA_FLAG_RTPREF_LOW:
897 * This case should never happen. If it did, it would mean a
898 * serious bug of kernel internal. We thus always bark here.
899 * Or, can we even panic?
901 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
902 return (RTPREF_INVALID);
908 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
909 * draft-ietf-ipngwg-router-selection:
910 * 1) Routers that are reachable or probably reachable should be preferred.
911 * If we have more than one (probably) reachable router, prefer ones
912 * with the highest router preference.
913 * 2) When no routers on the list are known to be reachable or
914 * probably reachable, routers SHOULD be selected in a round-robin
915 * fashion, regardless of router preference values.
916 * 3) If the Default Router List is empty, assume that all
917 * destinations are on-link.
919 * We assume nd_defrouter is sorted by router preference value.
920 * Since the code below covers both with and without router preference cases,
921 * we do not need to classify the cases by ifdef.
923 * At this moment, we do not try to install more than one default router,
924 * even when the multipath routing is available, because we're not sure about
925 * the benefits for stub hosts comparing to the risk of making the code
926 * complicated and the possibility of introducing bugs.
928 * We maintain a single list of routers for multiple FIBs, only considering one
929 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
930 * we do the whole thing multiple times.
933 defrouter_select_fib(int fibnum)
935 struct epoch_tracker et;
936 struct nd_defrouter *dr, *selected_dr, *installed_dr;
937 struct llentry *ln = NULL;
939 if (fibnum == RT_ALL_FIBS) {
940 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
941 defrouter_select_fib(fibnum);
947 * Let's handle easy case (3) first:
948 * If default router list is empty, there's nothing to be done.
950 if (TAILQ_EMPTY(&V_nd6_defrouter)) {
956 * Search for a (probably) reachable router from the list.
957 * We just pick up the first reachable one (if any), assuming that
958 * the ordering rule of the list described in defrtrlist_update().
960 selected_dr = installed_dr = NULL;
961 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
963 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
964 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
965 ND6_IS_LLINFO_PROBREACH(ln)) {
967 defrouter_ref(selected_dr);
975 if (dr->installed && dr->ifp->if_fib == fibnum) {
976 if (installed_dr == NULL) {
978 defrouter_ref(installed_dr);
981 * this should not happen.
982 * warn for diagnosis.
984 log(LOG_ERR, "defrouter_select_fib: more than "
985 "one router is installed\n");
990 * If none of the default routers was found to be reachable,
991 * round-robin the list regardless of preference.
992 * Otherwise, if we have an installed router, check if the selected
993 * (reachable) router should really be preferred to the installed one.
994 * We only prefer the new router when the old one is not reachable
995 * or when the new one has a really higher preference value.
997 if (selected_dr == NULL) {
998 if (installed_dr == NULL ||
999 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
1000 dr = TAILQ_FIRST(&V_nd6_defrouter);
1002 dr = TAILQ_NEXT(installed_dr, dr_entry);
1004 /* Ensure we select a router for this FIB. */
1005 TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) {
1006 if (dr->ifp->if_fib == fibnum) {
1008 defrouter_ref(selected_dr);
1012 } else if (installed_dr != NULL) {
1013 NET_EPOCH_ENTER(et);
1014 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
1015 installed_dr->ifp)) &&
1016 ND6_IS_LLINFO_PROBREACH(ln) &&
1017 installed_dr->ifp->if_fib == fibnum &&
1018 rtpref(selected_dr) <= rtpref(installed_dr)) {
1019 defrouter_rele(selected_dr);
1020 selected_dr = installed_dr;
1029 * If we selected a router for this FIB and it's different
1030 * than the installed one, remove the installed router and
1031 * install the selected one in its place.
1033 if (installed_dr != selected_dr) {
1034 if (installed_dr != NULL) {
1035 defrouter_delreq(installed_dr);
1036 defrouter_rele(installed_dr);
1038 if (selected_dr != NULL)
1039 defrouter_addreq(selected_dr);
1041 if (selected_dr != NULL)
1042 defrouter_rele(selected_dr);
1045 static struct nd_defrouter *
1046 defrtrlist_update(struct nd_defrouter *new)
1048 struct nd_defrouter *dr, *n;
1053 if (new->rtlifetime == 0) {
1054 defrouter_remove(&new->rtaddr, new->ifp);
1059 writelocked = false;
1061 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
1063 oldpref = rtpref(dr);
1066 dr->raflags = new->raflags; /* XXX flag check */
1067 dr->rtlifetime = new->rtlifetime;
1068 dr->expire = new->expire;
1071 * If the preference does not change, there's no need
1072 * to sort the entries. Also make sure the selected
1073 * router is still installed in the kernel.
1075 if (dr->installed && rtpref(new) == oldpref) {
1085 * The router needs to be reinserted into the default router
1086 * list, so upgrade to a write lock. If that fails and the list
1087 * has potentially changed while the lock was dropped, we'll
1088 * redo the lookup with the write lock held.
1092 if (!ND6_TRY_UPGRADE()) {
1093 genid = V_nd6_list_genid;
1096 if (genid != V_nd6_list_genid)
1103 * The preferred router may have changed, so relocate this
1106 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
1109 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1114 memcpy(n, new, sizeof(*n));
1115 /* Initialize with an extra reference for the caller. */
1116 refcount_init(&n->refcnt, 2);
1120 * Insert the new router in the Default Router List;
1121 * The Default Router List should be in the descending order
1122 * of router-preferece. Routers with the same preference are
1123 * sorted in the arriving time order.
1126 /* insert at the end of the group */
1127 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1128 if (rtpref(n) > rtpref(dr))
1132 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1134 TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry);
1138 defrouter_select_fib(new->ifp->if_fib);
1144 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1146 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1147 ndpr->ndpr_preferred = 0;
1149 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1150 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1151 ndpr->ndpr_expire = 0;
1153 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1159 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1161 /* init ia6t_expire */
1162 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1163 lt6->ia6t_expire = 0;
1165 lt6->ia6t_expire = time_uptime;
1166 lt6->ia6t_expire += lt6->ia6t_vltime;
1169 /* init ia6t_preferred */
1170 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1171 lt6->ia6t_preferred = 0;
1173 lt6->ia6t_preferred = time_uptime;
1174 lt6->ia6t_preferred += lt6->ia6t_pltime;
1178 static struct in6_ifaddr *
1179 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1181 struct ifnet *ifp = pr->ndpr_ifp;
1183 struct in6_aliasreq ifra;
1184 struct in6_ifaddr *ia, *ib;
1186 struct in6_addr mask;
1187 int prefixlen = pr->ndpr_plen;
1189 char ip6buf[INET6_ADDRSTRLEN];
1191 in6_prefixlen2mask(&mask, prefixlen);
1194 * find a link-local address (will be interface ID).
1195 * Is it really mandatory? Theoretically, a global or a site-local
1196 * address can be configured without a link-local address, if we
1197 * have a unique interface identifier...
1199 * it is not mandatory to have a link-local address, we can generate
1200 * interface identifier on the fly. we do this because:
1201 * (1) it should be the easiest way to find interface identifier.
1202 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1203 * for multiple addresses on a single interface, and possible shortcut
1204 * of DAD. we omitted DAD for this reason in the past.
1205 * (3) a user can prevent autoconfiguration of global address
1206 * by removing link-local address by hand (this is partly because we
1207 * don't have other way to control the use of IPv6 on an interface.
1208 * this has been our design choice - cf. NRL's "ifconfig auto").
1209 * (4) it is easier to manage when an interface has addresses
1210 * with the same interface identifier, than to have multiple addresses
1211 * with different interface identifiers.
1213 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1215 ib = (struct in6_ifaddr *)ifa;
1219 /* prefixlen + ifidlen must be equal to 128 */
1220 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1221 if (prefixlen != plen0) {
1224 "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n",
1225 __func__, if_name(ifp), prefixlen, 128 - plen0));
1230 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
1232 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
1234 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1235 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1236 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1237 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1238 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1239 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1240 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1241 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1245 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1246 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1248 /* XXX: scope zone ID? */
1250 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1253 * Make sure that we do not have this address already. This should
1254 * usually not happen, but we can still see this case, e.g., if we
1255 * have manually configured the exact address to be configured.
1257 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1258 &ifra.ifra_addr.sin6_addr);
1261 /* this should be rare enough to make an explicit log */
1262 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1263 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1268 * Allocate ifaddr structure, link into chain, etc.
1269 * If we are going to create a new address upon receiving a multicasted
1270 * RA, we need to impose a random delay before starting DAD.
1271 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1275 updateflags |= IN6_IFAUPDATE_DADDELAY;
1276 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1278 "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__,
1279 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1280 if_name(ifp), error));
1281 return (NULL); /* ifaddr must not have been allocated. */
1284 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1286 * XXXRW: Assumption of non-NULLness here might not be true with
1287 * fine-grained locking -- should we validate it? Or just return
1288 * earlier ifa rather than looking it up again?
1290 return (ia); /* this is always non-NULL and referenced. */
1293 static struct nd_prefix *
1294 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1296 struct nd_prefix *search;
1300 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1301 if (key->ndpr_ifp == search->ndpr_ifp &&
1302 key->ndpr_plen == search->ndpr_plen &&
1303 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1304 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1305 nd6_prefix_ref(search);
1313 nd6_prefix_lookup(struct nd_prefixctl *key)
1315 struct nd_prefix *search;
1318 search = nd6_prefix_lookup_locked(key);
1324 nd6_prefix_ref(struct nd_prefix *pr)
1327 refcount_acquire(&pr->ndpr_refcnt);
1331 nd6_prefix_rele(struct nd_prefix *pr)
1334 if (refcount_release(&pr->ndpr_refcnt)) {
1335 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1336 ("prefix %p has advertising routers", pr));
1342 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1343 struct nd_prefix **newp)
1345 struct nd_prefix *new;
1346 char ip6buf[INET6_ADDRSTRLEN];
1349 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1352 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1353 new->ndpr_ifp = pr->ndpr_ifp;
1354 new->ndpr_prefix = pr->ndpr_prefix;
1355 new->ndpr_plen = pr->ndpr_plen;
1356 new->ndpr_vltime = pr->ndpr_vltime;
1357 new->ndpr_pltime = pr->ndpr_pltime;
1358 new->ndpr_flags = pr->ndpr_flags;
1359 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1360 free(new, M_IP6NDP);
1363 new->ndpr_lastupdate = time_uptime;
1365 /* initialization */
1366 LIST_INIT(&new->ndpr_advrtrs);
1367 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1368 /* make prefix in the canonical form */
1369 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1372 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1376 /* ND_OPT_PI_FLAG_ONLINK processing */
1377 if (new->ndpr_raf_onlink) {
1378 struct epoch_tracker et;
1381 NET_EPOCH_ENTER(et);
1382 if ((error = nd6_prefix_onlink(new)) != 0) {
1383 nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d "
1384 "on-link on %s (errno=%d)\n", __func__,
1385 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1386 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1387 /* proceed anyway. XXX: is it correct? */
1390 ND6_ONLINK_UNLOCK();
1394 pfxrtr_add(new, dr);
1401 * Remove a prefix from the prefix list and optionally stash it in a
1402 * caller-provided list.
1404 * The ND6 lock must be held.
1407 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1412 LIST_REMOVE(pr, ndpr_entry);
1415 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1419 * Free an unlinked prefix, first marking it off-link if necessary.
1422 nd6_prefix_del(struct nd_prefix *pr)
1424 struct nd_pfxrouter *pfr, *next;
1426 char ip6buf[INET6_ADDRSTRLEN];
1428 KASSERT(pr->ndpr_addrcnt == 0,
1429 ("prefix %p has referencing addresses", pr));
1430 ND6_UNLOCK_ASSERT();
1433 * Though these flags are now meaningless, we'd rather keep the value
1434 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1435 * when executing "ndp -p".
1437 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1439 if ((e = nd6_prefix_offlink(pr)) != 0) {
1441 "%s: failed to make the prefix %s/%d offlink on %s "
1442 "(errno=%d)\n", __func__,
1443 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1444 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1445 /* what should we do? */
1447 ND6_ONLINK_UNLOCK();
1450 /* Release references to routers that have advertised this prefix. */
1452 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1456 nd6_prefix_rele(pr);
1458 pfxlist_onlink_check();
1462 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1463 struct mbuf *m, int mcast)
1465 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1467 struct ifnet *ifp = new->ndpr_ifp;
1468 struct nd_prefix *pr;
1471 struct in6_addrlifetime lt6_tmp;
1472 char ip6buf[INET6_ADDRSTRLEN];
1479 * Authenticity for NA consists authentication for
1480 * both IP header and IP datagrams, doesn't it ?
1482 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1483 auth = ((m->m_flags & M_AUTHIPHDR) &&
1484 (m->m_flags & M_AUTHIPDGM));
1488 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1490 * nd6_prefix_lookup() ensures that pr and new have the same
1491 * prefix on a same interface.
1495 * Update prefix information. Note that the on-link (L) bit
1496 * and the autonomous (A) bit should NOT be changed from 1
1499 if (new->ndpr_raf_onlink == 1)
1500 pr->ndpr_raf_onlink = 1;
1501 if (new->ndpr_raf_auto == 1)
1502 pr->ndpr_raf_auto = 1;
1503 if (new->ndpr_raf_onlink) {
1504 pr->ndpr_vltime = new->ndpr_vltime;
1505 pr->ndpr_pltime = new->ndpr_pltime;
1506 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1507 pr->ndpr_lastupdate = time_uptime;
1510 if (new->ndpr_raf_onlink &&
1511 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1513 if ((error = nd6_prefix_onlink(pr)) != 0) {
1515 "%s: failed to make the prefix %s/%d "
1516 "on-link on %s (errno=%d)\n", __func__,
1518 &pr->ndpr_prefix.sin6_addr),
1519 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1521 /* proceed anyway. XXX: is it correct? */
1523 ND6_ONLINK_UNLOCK();
1529 if (new->ndpr_vltime == 0)
1531 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1534 error = nd6_prelist_add(new, dr, &pr);
1536 nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for "
1537 "the prefix %s/%d on %s (errno=%d)\n", __func__,
1538 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1539 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1540 goto end; /* we should just give up in this case. */
1544 * XXX: from the ND point of view, we can ignore a prefix
1545 * with the on-link bit being zero. However, we need a
1546 * prefix structure for references from autoconfigured
1547 * addresses. Thus, we explicitly make sure that the prefix
1548 * itself expires now.
1550 if (pr->ndpr_raf_onlink == 0) {
1551 pr->ndpr_vltime = 0;
1552 pr->ndpr_pltime = 0;
1553 in6_init_prefix_ltimes(pr);
1558 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1559 * Note that pr must be non NULL at this point.
1562 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1563 if (!new->ndpr_raf_auto)
1567 * 5.5.3 (b). the link-local prefix should have been ignored in
1571 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1572 if (new->ndpr_pltime > new->ndpr_vltime) {
1573 error = EINVAL; /* XXX: won't be used */
1578 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1579 * an address configured by stateless autoconfiguration already in the
1580 * list of addresses associated with the interface, and the Valid
1581 * Lifetime is not 0, form an address. We first check if we have
1582 * a matching prefix.
1583 * Note: we apply a clarification in rfc2462bis-02 here. We only
1584 * consider autoconfigured addresses while RFC2462 simply said
1587 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1588 struct in6_ifaddr *ifa6;
1589 u_int32_t remaininglifetime;
1591 if (ifa->ifa_addr->sa_family != AF_INET6)
1594 ifa6 = (struct in6_ifaddr *)ifa;
1597 * We only consider autoconfigured addresses as per rfc2462bis.
1599 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1603 * Spec is not clear here, but I believe we should concentrate
1604 * on unicast (i.e. not anycast) addresses.
1605 * XXX: other ia6_flags? detached or duplicated?
1607 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1611 * Ignore the address if it is not associated with a prefix
1612 * or is associated with a prefix that is different from this
1613 * one. (pr is never NULL here)
1615 if (ifa6->ia6_ndpr != pr)
1618 if (ia6_match == NULL) /* remember the first one */
1622 * An already autoconfigured address matched. Now that we
1623 * are sure there is at least one matched address, we can
1624 * proceed to 5.5.3. (e): update the lifetimes according to the
1625 * "two hours" rule and the privacy extension.
1626 * We apply some clarifications in rfc2462bis:
1627 * - use remaininglifetime instead of storedlifetime as a
1629 * - remove the dead code in the "two-hour" rule
1631 #define TWOHOUR (120*60)
1632 lt6_tmp = ifa6->ia6_lifetime;
1634 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1635 remaininglifetime = ND6_INFINITE_LIFETIME;
1636 else if (time_uptime - ifa6->ia6_updatetime >
1637 lt6_tmp.ia6t_vltime) {
1639 * The case of "invalid" address. We should usually
1640 * not see this case.
1642 remaininglifetime = 0;
1644 remaininglifetime = lt6_tmp.ia6t_vltime -
1645 (time_uptime - ifa6->ia6_updatetime);
1647 /* when not updating, keep the current stored lifetime. */
1648 lt6_tmp.ia6t_vltime = remaininglifetime;
1650 if (TWOHOUR < new->ndpr_vltime ||
1651 remaininglifetime < new->ndpr_vltime) {
1652 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1653 } else if (remaininglifetime <= TWOHOUR) {
1655 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1659 * new->ndpr_vltime <= TWOHOUR &&
1660 * TWOHOUR < remaininglifetime
1662 lt6_tmp.ia6t_vltime = TWOHOUR;
1665 /* The 2 hour rule is not imposed for preferred lifetime. */
1666 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1668 in6_init_address_ltimes(pr, <6_tmp);
1671 * We need to treat lifetimes for temporary addresses
1672 * differently, according to
1673 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1674 * we only update the lifetimes when they are in the maximum
1677 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1678 u_int32_t maxvltime, maxpltime;
1680 if (V_ip6_temp_valid_lifetime >
1681 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1682 V_ip6_desync_factor)) {
1683 maxvltime = V_ip6_temp_valid_lifetime -
1684 (time_uptime - ifa6->ia6_createtime) -
1685 V_ip6_desync_factor;
1688 if (V_ip6_temp_preferred_lifetime >
1689 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1690 V_ip6_desync_factor)) {
1691 maxpltime = V_ip6_temp_preferred_lifetime -
1692 (time_uptime - ifa6->ia6_createtime) -
1693 V_ip6_desync_factor;
1697 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1698 lt6_tmp.ia6t_vltime > maxvltime) {
1699 lt6_tmp.ia6t_vltime = maxvltime;
1701 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1702 lt6_tmp.ia6t_pltime > maxpltime) {
1703 lt6_tmp.ia6t_pltime = maxpltime;
1706 ifa6->ia6_lifetime = lt6_tmp;
1707 ifa6->ia6_updatetime = time_uptime;
1709 if (ia6_match == NULL && new->ndpr_vltime) {
1713 * 5.5.3 (d) (continued)
1714 * No address matched and the valid lifetime is non-zero.
1715 * Create a new address.
1719 * Prefix Length check:
1720 * If the sum of the prefix length and interface identifier
1721 * length does not equal 128 bits, the Prefix Information
1722 * option MUST be ignored. The length of the interface
1723 * identifier is defined in a separate link-type specific
1726 ifidlen = in6_if2idlen(ifp);
1728 /* this should not happen, so we always log it. */
1729 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1733 if (ifidlen + pr->ndpr_plen != 128) {
1735 "%s: invalid prefixlen %d for %s, ignored\n",
1736 __func__, pr->ndpr_plen, if_name(ifp)));
1740 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1742 * note that we should use pr (not new) for reference.
1749 * When a new public address is created as described
1750 * in RFC2462, also create a new temporary address.
1753 * When an interface connects to a new link, a new
1754 * randomized interface identifier should be generated
1755 * immediately together with a new set of temporary
1756 * addresses. Thus, we specifiy 1 as the 2nd arg of
1759 if (V_ip6_use_tempaddr) {
1761 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1762 nd6log((LOG_NOTICE, "%s: failed to "
1763 "create a temporary address "
1764 "(errno=%d)\n", __func__, e));
1767 ifa_free(&ia6->ia_ifa);
1770 * A newly added address might affect the status
1771 * of other addresses, so we check and update it.
1772 * XXX: what if address duplication happens?
1774 pfxlist_onlink_check();
1776 /* just set an error. do not bark here. */
1777 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1783 nd6_prefix_rele(pr);
1788 * A supplement function used in the on-link detection below;
1789 * detect if a given prefix has a (probably) reachable advertising router.
1790 * XXX: lengthy function name...
1792 static struct nd_pfxrouter *
1793 find_pfxlist_reachable_router(struct nd_prefix *pr)
1795 struct epoch_tracker et;
1796 struct nd_pfxrouter *pfxrtr;
1802 NET_EPOCH_ENTER(et);
1803 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1804 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1807 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1817 * Check if each prefix in the prefix list has at least one available router
1818 * that advertised the prefix (a router is "available" if its neighbor cache
1819 * entry is reachable or probably reachable).
1820 * If the check fails, the prefix may be off-link, because, for example,
1821 * we have moved from the network but the lifetime of the prefix has not
1822 * expired yet. So we should not use the prefix if there is another prefix
1823 * that has an available router.
1824 * But, if there is no prefix that has an available router, we still regard
1825 * all the prefixes as on-link. This is because we can't tell if all the
1826 * routers are simply dead or if we really moved from the network and there
1827 * is no router around us.
1830 pfxlist_onlink_check(void)
1832 struct nd_prefix *pr;
1833 struct in6_ifaddr *ifa;
1834 struct nd_defrouter *dr;
1835 struct nd_pfxrouter *pfxrtr = NULL;
1836 struct rm_priotracker in6_ifa_tracker;
1844 * Check if there is a prefix that has a reachable advertising
1847 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1848 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1853 * If we have no such prefix, check whether we still have a router
1854 * that does not advertise any prefixes.
1857 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1858 struct nd_prefix *pr0;
1860 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1861 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1868 if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) {
1870 * There is at least one prefix that has a reachable router,
1871 * or at least a router which probably does not advertise
1872 * any prefixes. The latter would be the case when we move
1873 * to a new link where we have a router that does not provide
1874 * prefixes and we configure an address by hand.
1875 * Detach prefixes which have no reachable advertising
1876 * router, and attach other prefixes.
1878 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1879 /* XXX: a link-local prefix should never be detached */
1880 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1881 pr->ndpr_raf_onlink == 0 ||
1882 pr->ndpr_raf_auto == 0)
1885 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1886 find_pfxlist_reachable_router(pr) == NULL)
1887 pr->ndpr_stateflags |= NDPRF_DETACHED;
1888 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1889 find_pfxlist_reachable_router(pr) != NULL)
1890 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1893 /* there is no prefix that has a reachable router */
1894 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1895 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1896 pr->ndpr_raf_onlink == 0 ||
1897 pr->ndpr_raf_auto == 0)
1899 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1904 * Remove each interface route associated with a (just) detached
1905 * prefix, and reinstall the interface route for a (just) attached
1906 * prefix. Note that all attempt of reinstallation does not
1907 * necessarily success, when a same prefix is shared among multiple
1908 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1909 * so we don't have to care about them.
1912 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1913 char ip6buf[INET6_ADDRSTRLEN];
1916 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1917 pr->ndpr_raf_onlink == 0 ||
1918 pr->ndpr_raf_auto == 0)
1921 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1922 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1923 genid = V_nd6_list_genid;
1925 if ((flags & NDPRF_ONLINK) != 0 &&
1926 (e = nd6_prefix_offlink(pr)) != 0) {
1928 "%s: failed to make %s/%d offlink "
1929 "(errno=%d)\n", __func__,
1931 &pr->ndpr_prefix.sin6_addr),
1933 } else if ((flags & NDPRF_ONLINK) == 0 &&
1934 (e = nd6_prefix_onlink(pr)) != 0) {
1936 "%s: failed to make %s/%d onlink "
1937 "(errno=%d)\n", __func__,
1939 &pr->ndpr_prefix.sin6_addr),
1943 if (genid != V_nd6_list_genid)
1949 * Changes on the prefix status might affect address status as well.
1950 * Make sure that all addresses derived from an attached prefix are
1951 * attached, and that all addresses derived from a detached prefix are
1952 * detached. Note, however, that a manually configured address should
1953 * always be attached.
1954 * The precise detection logic is same as the one for prefixes.
1956 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1957 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1958 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1961 if (ifa->ia6_ndpr == NULL) {
1963 * This can happen when we first configure the address
1964 * (i.e. the address exists, but the prefix does not).
1965 * XXX: complicated relationships...
1970 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1974 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1975 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1978 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1981 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1982 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1983 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1984 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1985 nd6_dad_start((struct ifaddr *)ifa, 0);
1988 ifa->ia6_flags |= IN6_IFF_DETACHED;
1992 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1993 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1996 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1997 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1998 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1999 /* Do we need a delay in this case? */
2000 nd6_dad_start((struct ifaddr *)ifa, 0);
2004 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
2006 ND6_ONLINK_UNLOCK();
2010 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
2012 struct sockaddr_dl sdl;
2014 struct sockaddr_in6 mask6;
2016 int error, a_failure, fibnum, maxfib;
2019 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
2020 * ifa->ifa_rtrequest = nd6_rtrequest;
2022 bzero(&mask6, sizeof(mask6));
2023 mask6.sin6_len = sizeof(mask6);
2024 mask6.sin6_addr = pr->ndpr_mask;
2025 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
2027 bzero(&sdl, sizeof(struct sockaddr_dl));
2028 sdl.sdl_len = sizeof(struct sockaddr_dl);
2029 sdl.sdl_family = AF_LINK;
2030 sdl.sdl_type = ifa->ifa_ifp->if_type;
2031 sdl.sdl_index = ifa->ifa_ifp->if_index;
2033 if(V_rt_add_addr_allfibs) {
2035 maxfib = rt_numfibs;
2037 fibnum = ifa->ifa_ifp->if_fib;
2038 maxfib = fibnum + 1;
2041 for (; fibnum < maxfib; fibnum++) {
2044 error = in6_rtrequest(RTM_ADD,
2045 (struct sockaddr *)&pr->ndpr_prefix, (struct sockaddr *)&sdl,
2046 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
2048 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
2049 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
2052 nd6_rtmsg(RTM_ADD, rt);
2054 pr->ndpr_stateflags |= NDPRF_ONLINK;
2056 char ip6buf[INET6_ADDRSTRLEN];
2057 char ip6bufg[INET6_ADDRSTRLEN];
2058 char ip6bufm[INET6_ADDRSTRLEN];
2059 struct sockaddr_in6 *sin6;
2061 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2062 nd6log((LOG_ERR, "%s: failed to add "
2063 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
2064 "flags=%lx errno = %d\n", __func__,
2065 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2066 pr->ndpr_plen, if_name(pr->ndpr_ifp),
2067 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
2068 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
2071 /* Save last error to return, see rtinit(). */
2082 /* Return the last error we got. */
2087 nd6_prefix_onlink(struct nd_prefix *pr)
2089 struct epoch_tracker et;
2091 struct ifnet *ifp = pr->ndpr_ifp;
2092 struct nd_prefix *opr;
2093 char ip6buf[INET6_ADDRSTRLEN];
2096 ND6_ONLINK_LOCK_ASSERT();
2097 ND6_UNLOCK_ASSERT();
2099 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
2103 * Add the interface route associated with the prefix. Before
2104 * installing the route, check if there's the same prefix on another
2105 * interface, and the prefix has already installed the interface route.
2106 * Although such a configuration is expected to be rare, we explicitly
2110 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2114 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2117 if (!V_rt_add_addr_allfibs &&
2118 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
2121 if (opr->ndpr_plen == pr->ndpr_plen &&
2122 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2123 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2131 * We prefer link-local addresses as the associated interface address.
2133 /* search for a link-local addr */
2134 NET_EPOCH_ENTER(et);
2135 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
2136 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
2138 /* XXX: freebsd does not have ifa_ifwithaf */
2139 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2140 if (ifa->ifa_addr->sa_family == AF_INET6) {
2145 /* should we care about ia6_flags? */
2150 * This can still happen, when, for example, we receive an RA
2151 * containing a prefix with the L bit set and the A bit clear,
2152 * after removing all IPv6 addresses on the receiving
2153 * interface. This should, of course, be rare though.
2156 "%s: failed to find any ifaddr to add route for a "
2157 "prefix(%s/%d) on %s\n", __func__,
2158 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2159 pr->ndpr_plen, if_name(ifp)));
2163 error = nd6_prefix_onlink_rtrequest(pr, ifa);
2172 nd6_prefix_offlink(struct nd_prefix *pr)
2175 struct ifnet *ifp = pr->ndpr_ifp;
2176 struct nd_prefix *opr;
2177 struct sockaddr_in6 sa6, mask6;
2179 char ip6buf[INET6_ADDRSTRLEN];
2181 int fibnum, maxfib, a_failure;
2183 ND6_ONLINK_LOCK_ASSERT();
2184 ND6_UNLOCK_ASSERT();
2186 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2189 bzero(&sa6, sizeof(sa6));
2190 sa6.sin6_family = AF_INET6;
2191 sa6.sin6_len = sizeof(sa6);
2192 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2193 sizeof(struct in6_addr));
2194 bzero(&mask6, sizeof(mask6));
2195 mask6.sin6_family = AF_INET6;
2196 mask6.sin6_len = sizeof(sa6);
2197 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2199 if (V_rt_add_addr_allfibs) {
2201 maxfib = rt_numfibs;
2203 fibnum = ifp->if_fib;
2204 maxfib = fibnum + 1;
2208 for (; fibnum < maxfib; fibnum++) {
2210 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
2211 (struct sockaddr *)&mask6, 0, &rt, fibnum);
2213 /* report the route deletion to the routing socket. */
2215 nd6_rtmsg(RTM_DELETE, rt);
2217 /* Save last error to return, see rtinit(). */
2227 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2230 * There might be the same prefix on another interface,
2231 * the prefix which could not be on-link just because we have
2232 * the interface route (see comments in nd6_prefix_onlink).
2233 * If there's one, try to make the prefix on-link on the
2238 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2240 * KAME specific: detached prefixes should not be
2243 if (opr == pr || (opr->ndpr_stateflags &
2244 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2247 if (opr->ndpr_plen == pr->ndpr_plen &&
2248 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2249 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2252 genid = V_nd6_list_genid;
2254 if ((e = nd6_prefix_onlink(opr)) != 0) {
2256 "%s: failed to recover a prefix "
2257 "%s/%d from %s to %s (errno=%d)\n",
2258 __func__, ip6_sprintf(ip6buf,
2259 &opr->ndpr_prefix.sin6_addr),
2260 opr->ndpr_plen, if_name(ifp),
2261 if_name(opr->ndpr_ifp), e));
2265 if (genid != V_nd6_list_genid)
2271 /* XXX: can we still set the NDPRF_ONLINK flag? */
2273 "%s: failed to delete route: %s/%d on %s (errno=%d)\n",
2274 __func__, ip6_sprintf(ip6buf, &sa6.sin6_addr),
2275 pr->ndpr_plen, if_name(ifp), error));
2279 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2280 (struct sockaddr *)&mask6, LLE_STATIC);
2286 * ia0 - corresponding public address
2289 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2291 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2292 struct in6_ifaddr *newia;
2293 struct in6_aliasreq ifra;
2295 int trylimit = 3; /* XXX: adhoc value */
2297 u_int32_t randid[2];
2298 time_t vltime0, pltime0;
2300 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2301 &ia0->ia_prefixmask.sin6_addr);
2303 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2304 /* clear the old IFID */
2305 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2306 &ifra.ifra_prefixmask.sin6_addr);
2309 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2310 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2311 nd6log((LOG_NOTICE, "%s: failed to find a good random IFID\n",
2315 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2316 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2317 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2318 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2321 * in6_get_tmpifid() quite likely provided a unique interface ID.
2322 * However, we may still have a chance to see collision, because
2323 * there may be a time lag between generation of the ID and generation
2324 * of the address. So, we'll do one more sanity check.
2327 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2328 if (trylimit-- > 0) {
2333 /* Give up. Something strange should have happened. */
2334 nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n",
2340 * The Valid Lifetime is the lower of the Valid Lifetime of the
2341 * public address or TEMP_VALID_LIFETIME.
2342 * The Preferred Lifetime is the lower of the Preferred Lifetime
2343 * of the public address or TEMP_PREFERRED_LIFETIME -
2346 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2347 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2348 (ia0->ia6_lifetime.ia6t_vltime -
2349 (time_uptime - ia0->ia6_updatetime));
2350 if (vltime0 > V_ip6_temp_valid_lifetime)
2351 vltime0 = V_ip6_temp_valid_lifetime;
2353 vltime0 = V_ip6_temp_valid_lifetime;
2354 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2355 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2356 (ia0->ia6_lifetime.ia6t_pltime -
2357 (time_uptime - ia0->ia6_updatetime));
2358 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2359 pltime0 = V_ip6_temp_preferred_lifetime -
2360 V_ip6_desync_factor;
2363 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2364 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2365 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2368 * A temporary address is created only if this calculated Preferred
2369 * Lifetime is greater than REGEN_ADVANCE time units.
2371 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2374 /* XXX: scope zone ID? */
2376 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2378 /* allocate ifaddr structure, link into chain, etc. */
2381 updateflags |= IN6_IFAUPDATE_DADDELAY;
2382 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2385 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2386 if (newia == NULL) { /* XXX: can it happen? */
2388 "%s: ifa update succeeded, but we got no ifaddr\n",
2390 return (EINVAL); /* XXX */
2392 newia->ia6_ndpr = ia0->ia6_ndpr;
2393 newia->ia6_ndpr->ndpr_addrcnt++;
2394 ifa_free(&newia->ia_ifa);
2397 * A newly added address might affect the status of other addresses.
2398 * XXX: when the temporary address is generated with a new public
2399 * address, the onlink check is redundant. However, it would be safe
2400 * to do the check explicitly everywhere a new address is generated,
2401 * and, in fact, we surely need the check when we create a new
2402 * temporary address due to deprecation of an old temporary address.
2404 pfxlist_onlink_check();
2410 rt6_deleteroute(const struct rtentry *rt, void *arg)
2412 #define SIN6(s) ((struct sockaddr_in6 *)s)
2413 struct in6_addr *gate = (struct in6_addr *)arg;
2415 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2418 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2423 * Do not delete a static route.
2424 * XXX: this seems to be a bit ad-hoc. Should we consider the
2425 * 'cloned' bit instead?
2427 if ((rt->rt_flags & RTF_STATIC) != 0)
2431 * We delete only host route. This means, in particular, we don't
2432 * delete default route.
2434 if ((rt->rt_flags & RTF_HOST) == 0)
2442 * Delete all the routing table entries that use the specified gateway.
2443 * XXX: this function causes search through all entries of routing table, so
2444 * it shouldn't be called when acting as a router.
2447 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2450 /* We'll care only link-local addresses */
2451 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2454 /* XXX Do we really need to walk any but the default FIB? */
2455 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2459 nd6_setdefaultiface(int ifindex)
2463 if (ifindex < 0 || V_if_index < ifindex)
2465 if (ifindex != 0 && !ifnet_byindex(ifindex))
2468 if (V_nd6_defifindex != ifindex) {
2469 V_nd6_defifindex = ifindex;
2470 if (V_nd6_defifindex > 0)
2471 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2473 V_nd6_defifp = NULL;
2476 * Our current implementation assumes one-to-one maping between
2477 * interfaces and links, so it would be natural to use the
2478 * default interface as the default link.
2480 scope6_setdefault(V_nd6_defifp);
2487 nd6_defrouter_list_empty(void)
2490 return (TAILQ_EMPTY(&V_nd6_defrouter));
2494 nd6_defrouter_timer(void)
2496 struct nd_defrouter *dr, *ndr;
2497 struct nd6_drhead drq;
2502 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr)
2503 if (dr->expire && dr->expire < time_uptime)
2504 defrouter_unlink(dr, &drq);
2507 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2508 TAILQ_REMOVE(&drq, dr, dr_entry);
2514 * Nuke default router list entries toward ifp.
2515 * We defer removal of default router list entries that is installed in the
2516 * routing table, in order to keep additional side effects as small as possible.
2519 nd6_defrouter_purge(struct ifnet *ifp)
2521 struct nd_defrouter *dr, *ndr;
2522 struct nd6_drhead drq;
2527 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2531 defrouter_unlink(dr, &drq);
2533 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2537 defrouter_unlink(dr, &drq);
2541 /* Delete the unlinked router objects. */
2542 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2543 TAILQ_REMOVE(&drq, dr, dr_entry);
2549 nd6_defrouter_flush_all(void)
2551 struct nd_defrouter *dr;
2552 struct nd6_drhead drq;
2557 while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL)
2558 defrouter_unlink(dr, &drq);
2561 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2562 TAILQ_REMOVE(&drq, dr, dr_entry);
2568 nd6_defrouter_init(void)
2571 TAILQ_INIT(&V_nd6_defrouter);
2575 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2577 struct in6_defrouter d;
2578 struct nd_defrouter *dr;
2581 if (req->newptr != NULL)
2584 error = sysctl_wire_old_buffer(req, 0);
2588 bzero(&d, sizeof(d));
2589 d.rtaddr.sin6_family = AF_INET6;
2590 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2593 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
2594 d.rtaddr.sin6_addr = dr->rtaddr;
2595 error = sa6_recoverscope(&d.rtaddr);
2598 d.flags = dr->raflags;
2599 d.rtlifetime = dr->rtlifetime;
2600 d.expire = dr->expire + (time_second - time_uptime);
2601 d.if_index = dr->ifp->if_index;
2602 error = SYSCTL_OUT(req, &d, sizeof(d));
2609 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2610 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2611 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
2612 "NDP default router list");